A coal powder grinding device

Abstract

The application discloses a coal powder grinding device in the technical field of powder grinding equipment, which comprises a barrel body, roller supports arranged at two ends of the barrel body, a first motor for driving the barrel body to rotate, a partition plate fixed to the barrel body and used for separating the internal space of the barrel body into a coarse grinding chamber and a fine grinding chamber, a plurality of material leakage holes uniformly distributed on the partition plate, a feeding port arranged on one roller support and communicated with the coarse grinding chamber, a discharging port arranged on the other roller support, a discharging barrel rotatably connected to the roller support and extending into the fine grinding chamber, and a second motor fixed to the roller support and used for driving the discharging barrel to rotate. The coal block powder grinding efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grinding equipment, in particular to a coal powder grinding device. BACKGROUND

[0002] At present, the preparation of coal powder in cement plants, aluminum plants, power plants and other related enterprises is mainly completed by using a wind-swept coal mill. The wind-swept coal mill is a short and thick ball mill, which has only one grinding chamber, installs a wave-shaped lining plate inside, uses 30-70mm steel balls as grinding bodies, and simultaneously introduces hot air to dry the coal powder in the mill. This device has the characteristics of simple structure, convenient operation, high reliability and strong adaptability.

[0003] As known, different grinding body gradations should be used for coarse grinding and fine grinding to achieve higher grinding efficiency. Since the ordinary wind-swept coal mill has only one grinding chamber, it cannot separate coarse grinding and fine grinding, thus limiting the improvement of grinding efficiency. SUMMARY

[0004] The present application aims to provide a coal powder grinding device to solve the problem that the wind-swept coal mill in the prior art has only one grinding chamber and cannot separate coarse grinding and fine grinding.

[0005] A coal powder grinding device includes a barrel body and roller supports arranged at both ends of the barrel body, the barrel body is rotationally connected between the two roller supports, and a first motor is arranged for driving the barrel body to rotate. The barrel body is further fixed with a partition plate for separating the internal space into a coarse grinding chamber and a fine grinding chamber, and the partition plate is uniformly provided with a plurality of material leakage holes. The roller support on one side is provided with a feeding port communicating with the coarse grinding chamber. The roller support on the other side is provided with a discharging port, and the roller support on this side is rotationally connected with a discharging barrel extending into the fine grinding chamber. The roller support is fixed with a second motor for driving the discharging barrel to rotate. The outer periphery of the discharging barrel is uniformly and circumferentially provided with a plurality of discharging grooves, each of which is fixed with a screen. The roller support is fixed with an arc-shaped plate located inside the discharging barrel, the arc-shaped plate abuts against the inner periphery of the discharging barrel, and the arc-shaped plate extends out of the discharging port.

[0006] Working principle and beneficial effects of the present application:

[0007] The barrel body is separated into a coarse grinding chamber and a fine grinding chamber by the partition plate. Large grinding bodies are used in the coarse grinding chamber, and small grinding bodies are used in the fine grinding chamber. Coal blocks are added into the coarse grinding chamber through the feeding port. Since the barrel body is rotationally connected between the two roller supports, the first motor is started to drive the barrel body to rotate, and the large grinding bodies grind and crush the coal blocks. Since the partition plate is uniformly provided with a plurality of material leakage holes, the crushed coal blocks pass through the plurality of material leakage holes and enter the fine grinding chamber.

[0008] The small grinding body tumbling grinds the coal block into coal powder, the coal powder is tumbled in the fine grinding chamber and passes through the screen hole on the screen, the discharge slot into the discharge cylinder, at this time the arc-shaped plate and the inner periphery of the bottom of the discharge cylinder abut, the arc-shaped plate blocks the discharge slot at the bottom of the discharge cylinder, and the coal powder falls to the arc-shaped plate and flows towards the discharge port. However, during the grinding process, some coal residues smaller than or equal to the screen hole diameter will be accumulated on the screen to cause blockage, and even be stuck on the screen hole. Therefore, at this time, the second motor drives the discharge cylinder to rotate, so that the discharge slot at the top of the discharge cylinder is rotated to the bottom of the cylinder body, and the blocked coal residues are automatically dropped into the cylinder body due to the influence of gravity, and since the arc-shaped plate is fixedly connected with the roller support, the arc-shaped plate does not affect the rotation of the discharge cylinder, and always blocks the discharge slot at the bottom of the discharge cylinder, so that the coal powder always falls on the arc-shaped plate for discharge.

[0009] The powder grinding device has a coarse grinding chamber and a fine grinding chamber, which improves the grinding efficiency. In addition, the discharge cylinder is arranged in the fine grinding chamber, so that the ground powder can be discharged outward through the discharge slot during fine grinding, thereby reducing the occupation space of the coal powder in the fine grinding chamber, so as to provide more space for the small grinding body and the coal block to be fully tumbled, thereby improving the grinding efficiency.

[0010] Further, the discharge cylinder is downwardly inclined towards the discharge port, the arc-shaped plate is fixedly provided with a spiral discharge machine on the side away from the second motor, the spiral discharge machine comprises a feeding end and a discharging end, and the discharging end is located outside the discharge port. Under this optimization scheme, the coal powder falling on the arc-shaped plate accelerates to slide into the discharge port; and the spiral discharge machine is used to convey the coal powder towards the discharge port for discharge.

[0011] Further, the roller support is fixedly provided with a hot air pipe extending into the feeding port, and the hot air pipe is communicated with a hot air branch pipe; the inside of the bottom of the arc-shaped plate is provided with a cavity, the arc-shaped plate is provided with a connecting port communicated with the cavity, the hot air branch pipe and the connecting port are communicated, the bottom of the arc-shaped plate is provided with a blowing port communicated with the cavity, and the blowing port is aligned with the discharge slot at the bottom of the discharge cylinder.

[0012] The hot air pipe blows hot air into the feeding port, and the hot air enters the cylinder body to dry the coal block. However, when the coal powder passes through the screen and falls into the discharge cylinder, some coal residues will block the screen hole, and some coal powder with moisture will adhere to the screen to cause blockage, thereby reducing the discharge efficiency. Therefore, at this time, the second motor drives the discharge cylinder to rotate, so that the top blocked screen hole is rotated to be directly below the blowing port, the hot air is blown into the cavity through the hot air branch pipe and the connecting port, since the blowing port and the cavity are communicated, the hot air is blown downward through the blowing port, the wind power of the hot air pushes the blocked coal residues away from the screen hole, and the coal powder with moisture adhered to the screen is quickly dried, so that the adhered coal powder is separated after drying.

[0013] Furthermore, the hot air branch pipe is provided with a valve, which is used to control the conduction of the hot air branch pipe to avoid affecting the wind pressure in the hot air pipe.

[0014] Furthermore, the number of the discharge troughs is 3, and the angle between adjacent discharge troughs is 120 degrees. The coal powder can be quickly discharged outward through the three discharge troughs.

[0015] Furthermore, the inner periphery of the cylinder body and the outer periphery of the discharge cylinder are both wrapped with lining plates, which play a role in protecting the cylinder body and the discharge cylinder.

[0016] Furthermore, the angle between the axis of the discharge chute and the axis of the discharge barrel is 0 to 60 degrees. This arrangement can increase the speed at which the coal powder falls into the discharge barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a coal pulverizing device in Example 1 of the present invention;

[0018] Figure 2 for Figure 1 Vertical section of the discharge barrel;

[0019] Figure 3 This is a schematic structural diagram of a coal pulverizing device in Example 2 of the present invention;

[0020] Figure 4 for Figure 3 Vertical section of the discharge barrel. DETAILED DESCRIPTION

[0021] The following is further described in detail through specific implementation methods:

[0022] The figure marks in the drawings of the specification include: arc plate 1, discharge port 2, first roller bracket 3, second motor 4, discharge cylinder 5, partition 6, gear set 7, feed port 8, second roller bracket 9, first motor 10, screen 11, discharge trough 12, hot air branch pipe 13, cavity 14, and blowing port 15.

[0023] In the following statements, directional words such as "left", "right", "up", and "down" are all based on the directions in the diagram. In practice, if the corresponding structures are changed in the same direction based on the directions while keeping the relative positions unchanged, it will not affect the implementation of the plan.

[0024] Example 1: A coal powder grinding device, such as Figure 1 As shown, it includes a cylinder body and a first roller bracket 3 and a second roller bracket 9 arranged at both ends of the cylinder body. The cylinder body is rotatably connected between the first roller bracket 3 and the second roller bracket 9, and also includes a first motor 10 for driving the cylinder body to rotate (that is, the first motor 10 drives the cylinder body to rotate through the gear set 7).

[0025] The interior of the cylinder body is also fixed with a partition 6 for dividing its internal space into a coarse grinding chamber and a fine grinding chamber from right to left, and the partition 6 has multiple leakage holes evenly distributed; the second roller bracket 9 is provided with a feed port 8 connected to the coarse grinding chamber, and the first roller bracket 3 is provided with a discharge port 2. The first roller bracket 3 is rotatably connected to a discharge barrel 5 extending into the fine grinding chamber, and the first roller bracket 3 is fixed with a second motor 4 that drives the discharge barrel 5 to rotate.

[0026] like Figure 2 As shown, two discharge troughs 12 are evenly spaced along the circumferential direction of the outer circumference of the discharge barrel 5, and each discharge trough 12 is fixed with a screen 11. The first roller bracket 3 is fixed with an arc plate 1 located inside the discharge barrel 5, and the arc plate 1 is abutted against the inner circumference of the bottom of the discharge barrel 5, and the arc plate 1 extends out of the discharge port 2.

[0027] In this solution, a partition 6 is used to separate the drum into a coarse grinding chamber and a fine grinding chamber. The coarse grinding chamber uses large grinding media, while the fine grinding chamber uses small grinding media. Coal is fed into the coarse grinding chamber through a feed port 8. Since the drum is connected to the roller supports on both sides, the first motor 10 is activated to drive the drum rotation. The large grinding media grinds and crushes the coal. Since the partition 6 has multiple evenly distributed leakage holes, the crushed coal passes through the holes and enters the fine grinding chamber.

[0028] The small grinding bodies grind the coal into pulverized coal, which tumbles in the fine grinding chamber and passes through the mesh holes in the screen 11 into the discharge barrel 5. At this point, the curved plate 1 abuts the inner periphery of the bottom of the discharge barrel 5, blocking the discharge chute 12 at the bottom of the discharge barrel 5. The pulverized coal falls onto the curved plate 1 and flows toward the discharge port 2, where it is discharged. During the grinding process, some coal slag smaller than or equal to the mesh size can accumulate on the screen 11, causing blockage or even becoming lodged in the mesh holes.

[0029] To this end, the discharge barrel 5 is driven to rotate by the second motor 4, so that the discharge trough 12 at the top of the discharge barrel 5 rotates to face the bottom of the barrel body, and the coal slag blocked by gravity automatically falls into the barrel body. Since the arc plate 1 is fixedly connected to the roller bracket, the arc plate 1 will not affect the rotation of the discharge barrel 5, and the discharge trough 12 at the bottom of the discharge barrel 5 is always blocked, which will not affect the coal powder discharge.

[0030] The grinding device in this embodiment comprises a coarse grinding chamber and a fine grinding chamber, which improves grinding efficiency. Furthermore, a discharge barrel 5 is provided in the fine grinding chamber, allowing the coal powder to be promptly discharged through a discharge chute 12 during the fine grinding process. This reduces the space occupied by the coal powder in the fine grinding chamber, providing more space for the small grinding media and coal lumps to be fully turned over, thereby improving grinding efficiency.

[0031] In another embodiment 2, as shown in Figure 3 and Figure 4 The second roller support 9 is fixed with a hot air pipe extending into the feed inlet 8, and the hot air pipe is communicated with a hot air branch pipe 13. The inside of the bottom of the arc plate 1 is provided with a cavity 14, and the arc plate 1 is provided with a connecting port communicated with the cavity 14. The hot air branch pipe 13 is fixed and communicated with the connecting port. The bottom of the arc plate 1 is provided with a blowing port 15 communicated with the cavity 14, and the blowing port 15 is aligned with the discharge slot 12 of the discharge cylinder 5.

[0032] The hot air pipe blows hot air into the feed inlet 8 and into the cylinder body to dry the coal blocks. However, when the coal powder passes through the screen 11 and falls into the discharge cylinder 5, some coal residues will block the screen holes of the screen 11, and some coal powder with moisture will adhere to the screen 11 to cause blockage, thereby reducing the discharge efficiency. Therefore, at this time, the second motor 4 drives the discharge cylinder 5 to rotate, so that the blocked screen holes are turned to be directly below the blowing port 15. The hot air is blown into the cavity 14 through the hot air branch pipe 13 and the connecting port. Since the blowing port 15 is communicated with the cavity 14, the hot air is blown downward through the blowing port 15. The hot air pushes the blocked coal residues away from the screen holes, and quickly dries the coal powder adhered to the screen 11, so that the adhered coal powder is quickly separated.

[0033] For those skilled in the art, without departing from the technical concept of the present application, a plurality of modifications and improvements can be made, which should be considered as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A coal powder grinding device, characterized in that: It includes a cylinder body and roller brackets arranged at both ends of the cylinder body, the cylinder body is rotatably connected between the roller brackets on both sides, and also includes a first motor for driving the cylinder body to rotate; the cylinder body is also fixed with a partition for dividing its internal space into a coarse grinding chamber and a fine grinding chamber, and the partition is evenly distributed with a plurality of leakage holes; the roller bracket on one side is provided with a feed port connected to the coarse grinding chamber; the roller bracket on the other side is provided with a discharge port, and the roller bracket on this side is rotatably connected with a discharge cylinder extending into the fine grinding chamber, and the roller bracket is fixed with a second motor for driving the discharge cylinder to rotate; the outer periphery of the discharge cylinder is provided with a plurality of discharge troughs evenly spaced along the circumferential direction, each discharge trough is fixed with a screen, and the roller bracket is fixed with an arc plate located inside the discharge cylinder, the arc plate abuts against the inner periphery of the bottom of the discharge cylinder, and the arc plate extends out of the discharge port.

2. The coal powder grinding device according to claim 1, characterized in that: The discharging cylinder is tilted downward toward the discharging port, and a spiral discharging machine is fixedly provided on the side of the arc plate away from the second motor. The spiral discharging machine includes a feeding end and a discharging end, and the discharging end is located outside the discharging port.

3. The coal powder grinding device according to claim 2, characterized in that: The roller bracket is fixed with a hot air pipe extending into the feed port, and the hot air pipe is connected to a hot air branch pipe; a cavity is provided inside the bottom of the arc plate, and the arc plate is provided with a connecting port connected to the cavity, the hot air branch pipe is connected to the connecting port, and the bottom of the arc plate is provided with a blowing port connected to the cavity, and the blowing port is aligned with the discharge trough at the bottom of the discharge barrel.

4. The coal powder grinding device according to claim 3, characterized in that: The hot air branch pipe is provided with a valve.

5. The coal powder grinding device according to claim 4, characterized in that: The number of the discharge troughs is 3, and the angle between adjacent discharge troughs is 120 degrees.

6. The coal pulverizing device according to any one of claims 1 to 5, characterized in that: The inner periphery of the cylinder body and the outer periphery of the discharge cylinder are both wrapped with lining plates.

7. The coal powder grinding device according to claim 6, characterized in that: The angle between the axis of the discharge chute and the axis of the discharge barrel is 0 to 60 degrees.

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