Aggregate type impact mill pulverizing hammer head and pulverizing disc provided with the hammer head

Abstract

The present application relates to the technical field of superfine crushing, and particularly relates to a set material type impact mill crushing hammer head and a crushing disc provided with the hammer head, the crushing disc comprising a disc body and a plurality of hammer heads fixed on the disc body. The hammer head is a set material type impact mill crushing hammer head, comprising a body, a ramp windward surface and a windward vertical surface connected in sequence are arranged on the front face of the body, the ramp windward surface is located in front of the windward vertical surface, the height of the windward vertical surface is higher than that of the ramp windward surface; the upper part of the windward vertical surface forms an angular impact area. The rear face of the body is a smooth transition arc surface; the height of the arc surface is lower as it is closer to the rear end of the body. The hammer head can obviously reduce the air in the gas-solid two-phase flow to participate in the crushing collision, effectively reduce the generation of vortex, has the advantages of high crushing efficiency, long service life, high efficiency and energy saving, and reduces the energy consumption of the impact mill per ton of product.

Description

Technical Field

[0001] This invention relates to the field of ultrafine grinding technology, and in particular to a material-collecting impact mill grinding hammer and a grinding disc equipped with the hammer. Background Technology

[0002] In the field of dry ultrafine grinding technology for solid materials, impact mills are a widely used ultrafine grinding equipment, with hammers being its core grinding component. For example... Figure 4 , Figure 5 and Figure 6 As shown in the prior art, the impact mill's crushing chamber 1 is equipped with a horizontally rotating hammer disk 2. Multiple hammers 3 are fixedly connected at equal intervals along the circumferential direction on the outer ring of the hammer disk 2. The hammers 3 and the stator liner 4 form a crushing pair. During operation, the hammer disk 2 rotates at high speed driven by a motor. The material entering the mill collides with the high-speed rotating hammers 3 and is crushed. Furthermore, the material is thrown towards the stator liner 4 by centrifugal force under the influence of the rotating hammers 3. The material collides, rubs, and shears with the stator liner 4, thus achieving crushing.

[0003] In existing technologies, the hammerhead 3 is mostly rectangular in cross-section, forming a windward and leeward side as it rotates at high speed with the hammerhead disk 2. The collision between the gas-solid two-phase flow (comprising material and gas) and the hammerhead 3 mainly occurs on the windward side. For example... Figure 5 As shown in the airflow trajectory, when the gas-solid two-phase flow collides with the windward surface of the hammerhead 3 along the circumference of the hammerhead disk 2, the horizontal velocity of the gas-solid two-phase flow rapidly drops to zero and then transforms into a vertically upward velocity. Due to its high inertia, coarse particles will collide with the hammerhead 3 first, which is beneficial for crushing coarse particles. However, a disadvantage is that under the influence of Coriolis force, the collision between the coarse particles and the hammerhead 3 will be deflected at an angle, prolonging the friction distance and increasing wear on the hammerhead 3. On the other hand, this gas-solid two-phase flow has a high gas-solid ratio, meaning a relatively low material concentration (300-500 g / m³), which helps to remove fine powder in a timely manner and avoid over-crushing. However, during ultrafine grinding, because the gas-solid two-phase flow contains a large amount of gas, when colliding with the windward surface of the hammerhead 3, the large amount of airflow hinders the collision between the particles and the windward surface of the hammerhead 3, reducing the grinding efficiency. The leeward side of hammer 3 will form a local low-pressure vortex. This vortex contributes little to the crushing of materials, but it will accelerate the wear of hammer 3 and increase energy consumption.

[0004] like Figure 6 As shown, when the hammerhead disk 2 rotates at high speed, a pressure difference will be generated between the head 5 and the tail 6 of the hammerhead 3. The pressure at the tail 6 is lower than the pressure at the head 5, which will generate a pressure difference at the hammerhead 3. Figure 6The radial local vortex shown is beneficial for the circulation and crushing of materials in the crushing zone. However, when the material particles return to the tail 6 of the hammer 3, they are subjected to the tangential force and friction generated by the rotation of the hammer disk 2. The material particles will slide on the tail of the hammer 3 on the hammer disk 2, causing wear on the hammer disk 2 at that point, which will cause the hammer disk 2 to be scrapped prematurely due to wear. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings by providing a material-collecting impact mill crushing hammer and a crushing disc equipped with the hammer. During use, the hammer can significantly reduce the participation of air in the crushing collision in the gas-solid two-phase flow, effectively reduce the generation of eddies, and has the advantages of high crushing efficiency, long service life, high efficiency and energy saving, thereby reducing the energy consumption per ton of product of the impact mill.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A material-collecting impact mill crushing hammer head is characterized by: including a body, the front of which is provided with a sloping windward surface and a windward vertical surface connected in sequence, the sloping windward surface being located in front of the windward vertical surface, and the height of the windward vertical surface being higher than the height of the sloping windward surface; the upper part of the windward vertical surface forms an angular impact zone.

[0008] As an improvement, the windward side of the slope is an inclined plane.

[0009] As an improvement, the angle between the windward side of the slope and the horizontal plane is 20° to 30°.

[0010] As an improvement, the angle between the windward vertical plane and the vertical plane is ±5°.

[0011] As an improvement, the height from the top to the bottom of the windward vertical surface is 3 to 8 millimeters.

[0012] As an improvement, the rear of the body is a smoothly transitioned arc-shaped surface; the height of the arc-shaped surface decreases as it approaches the rear end of the body.

[0013] As an improvement, the main body has a through mounting hole in the middle, which is located behind the windward vertical surface.

[0014] As an improvement, the mounting hole is a countersunk hole.

[0015] A crushing disc includes a disc body and a plurality of hammers fixed on the disc body, wherein the hammers are the material-collecting impact mill crushing hammers described in any of the above claims.

[0016] The present invention adopts the above technical solution and has the following advantages compared with the prior art:

[0017] The present invention discloses a material-collecting impact mill crushing hammer and a crushing disc equipped with the hammer. The entire windward surface of the hammer is composed of a sloping windward surface and a windward vertical surface. When the gas-solid two-phase flow composed of material and gas collides with the sloping windward surface, the air in the gas-solid two-phase flow can be significantly reduced to participate in the crushing collision, effectively reducing the generation of eddies. It has the advantages of high crushing efficiency, long service life, high efficiency and energy saving, and reduces the energy consumption per ton of product of the impact mill.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a material-collecting impact mill crushing hammer head according to the present invention;

[0020] Figure 2 for Figure 1 Side view;

[0021] Figure 3 This is a schematic diagram of the streamlines formed by the collision between the gas-solid two-phase flow and the hammer head when the crushing disc of the present invention is in use;

[0022] Figure 4 This is a schematic diagram of the crushing pair structure formed by the impact mill hammer and the stator liner in the background art.

[0023] Figure 5 This is a schematic diagram of the streamlines formed by the collision of gas-solid two-phase flow and hammer head in the background technology.

[0024] Figure 6 This is a schematic diagram of the radial vortex trace structure of the hammerhead disk during operation in the background art.

[0025] Wherein: 1-crushing chamber, 2-hammer head plate, 3-hammer head, 4-stator liner, 5-head, 6-tail; 7-body, 8-sloping windward surface, 9-windward vertical surface, 10-arc curved surface, 11-mounting hole, 12-plate body. Detailed Implementation

[0026] For ease of explanation rather than limitation, the side of the impact mill's crushing hammer that faces the wind during use is defined as the front, and the opposite side is defined as the rear.

[0027] Example

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, a pulverizing disc includes a disc body 12 and a plurality of spaced-apart hammers 3 fixed to the upper edge of the disc body 12. The plurality of hammers 3 are evenly arranged along the circumference of the disc body 12. In this embodiment, 12 hammers 3 are arranged on the disc body 12 as an example. In practical applications, the number of hammers 3 can be set as needed.

[0029] The hammerhead 3 is a material-collecting impact mill crushing hammerhead, comprising a body 7. The front of the body 7 has a sloping windward surface 8 and a windward vertical surface 9 connected in sequence. The sloping windward surface 8 is located in front of the windward vertical surface 9, and the height of the windward vertical surface 9 is higher than the height of the sloping windward surface 8. An angular impact zone is formed at the upper part of the windward vertical surface 9. The sloping windward surface 8 is an inclined plane. The angle between the sloping windward surface 8 and the horizontal plane is 20°–30°. The angle between the windward vertical surface 9 and the vertical plane is ±5°. The height from the top to the bottom of the windward vertical surface 9 is 3–8 mm. Preferably, in this embodiment, the angle between the sloping windward surface 8 and the horizontal plane is 26°, the windward vertical surface 9 is arranged vertically, and the height from the top to the bottom of the windward vertical surface 9 is 5 mm.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, the rear of the main body 7 is a smoothly transitioned arc-shaped surface 10; the height of the arc-shaped surface 10 decreases towards the rear end of the main body 7. A through-hole 11 is provided in the middle of the main body 7, located behind the windward vertical surface 9. The mounting hole 11 is a countersunk hole. The disc body 12 has multiple threaded holes that mate with the mounting hole 11, and the hammer head 3 is mounted on the disc body 12 via fasteners and the mounting hole 11.

[0031] When in use, the pulverizing disc of this invention is horizontally rotated and installed in the pulverizing chamber of the impact mill. The multiple hammers 3 on the pulverizing disc and the stator liner in the pulverizing chamber form a pulverizing pair. During operation, the pulverizing disc rotates at high speed in the pulverizing chamber. The material entering the mill collides with the high-speed rotating hammers 3 and is pulverized. Furthermore, the material is thrown towards the stator liner due to centrifugal force under the action of the rotating hammers 3. The material collides, rubs, and shears with the stator liner, thereby achieving pulverization.

[0032] like Figure 3As shown, the entire windward surface of the hammerhead 3 consists of a straight, sloping windward surface 8 and a vertical windward surface 9. When the gas-solid two-phase flow composed of material and gas collides with the sloping windward surface 8, the velocity change of the gas-solid two-phase flow is slowed down. Due to the greater inertia of the material particles compared to the airflow, the material particles will first accumulate on the sloping windward surface 8, forming a layer of aggregate. Then, they will be crushed by collision on the vertical windward surface 9. In this process, the sloping windward surface 8 has a guiding effect on the airflow, increasing the overflow of airflow from the top surface of the hammerhead 3. This allows a large amount of airflow to overflow from the top of the hammerhead 3, which reduces the participation of gas when the material particles collide with the vertical windward surface 9 and significantly reduces the generation of radial local vortices. This improves the collision crushing efficiency and greatly reduces the energy consumption required for the hammerhead 3 to drive the airflow to rotate. The leeward surface of the hammerhead is an arc-shaped curved surface 10. The arc-shaped curved surface 10 eliminates the formation of local low-pressure vortices on the leeward surface, reduces wear on the hammerhead 3, increases the service life of the hammerhead 3, reduces unnecessary energy consumption, and has a significant energy-saving effect.

[0033] In summary, the present invention provides a material-collecting impact mill crushing hammer and a crushing disc equipped with the hammer. During use, the hammer can significantly reduce the participation of air in the crushing collision in the gas-solid two-phase flow, effectively reduce the generation of eddies, and has the advantages of high crushing efficiency, long service life, high efficiency and energy saving, thereby reducing the energy consumption per ton of product of the impact mill.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. An aggregate-type impact mill pulverizing hammer head, characterized by: The body (7) is provided with a ramp windward surface (8) and a windward vertical surface (9) connected in sequence in front of the body (7), the ramp windward surface (8) is in front of the windward vertical surface (9), and the height of the windward vertical surface (9) is higher than that of the ramp windward surface (8); the upper part of the windward vertical surface (9) forms an angular impact area.

2. The aggregate impact mill pulverizing hammer head of claim 1, wherein: The ramp windward surface (8) is a plane arranged obliquely.

3. The aggregate impact mill pulverizing hammer head of claim 2, wherein: The included angle between the ramp windward surface (8) and the horizontal plane is 20-30°.

4. The aggregate impact mill pulverizing hammer head of claim 1, wherein: The included angle between the windward vertical surface (9) and the vertical plane is ±5°.

5. The aggregate impact mill pulverizing hammer head of claim 1, wherein: The height from the top to the bottom of the windward vertical surface (9) is 3-8 mm.

6. The aggregate impact mill pulverizing hammer head of any one of claims 1 to 5, wherein: The back of the body (7) is an arc-shaped curved surface (10) with smooth transition; the closer to the back end of the body (7), the lower the height of the arc-shaped curved surface (10).

7. The aggregate impact mill pulverizing hammer head of any one of claims 1 to 5, wherein: The middle part of the body (7) is provided with an installation hole (11) penetrating from top to bottom, and the installation hole (11) is located behind the windward vertical surface (9).

8. The aggregate impact mill pulverizing hammer head of claim 7, wherein: The installation hole (11) is a counterbore.

9. A pulverizing disc, characterized by: The device comprises a disc body (12) and a plurality of hammer heads (3) fixed on the disc body (12), and the hammer head (3) is a gathering type impact mill hammer head according to any one of claims 1-8.

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