CN100484635C - Micronizing impact grinder and the powder processing system thereof - Google Patents

Abstract

The invention discloses a micro-powder impact mill for pulverizing ore powder. In the casing of the machine, there are positive and negative nail discs that face coaxially and rotate in opposite directions. There are positive and negative cones arranged coaxially in the middle, and reverse spiral acceleration grooves are opened on the positive and negative cones. The hammer crushing area forms the secondary crushing area of the micro-powder impact mill; after the crushing process in the two-stage crushing area, the finished powder can reach a particle size of D ₉₇ ≤ 3 microns, which is a combination of jet mill and mechanical impact mill. Micro powder mill equipment. The invention also discloses a powder processing system using a micro-powder impact mill, which is mainly composed of a crusher, a hoist, a storage hopper, an ultra-fine classifier, a cyclone collector, a bag collector and an induced draft fan, which can complete the processing of different grades The required powder is collected and processed, which has the characteristics of low energy consumption and high efficiency.

Description

Micro-powder impact mill and its powder processing system

(1) Technical field:

The invention relates to mineral powder crushing equipment, in particular to a micropowder impact mill and a powder processing system using the micropowder impact mill.

(two) background technology:

The equipment traditionally used for mineral powder crushing in my country is mechanical mill, which is divided into two types: rolling mill and impact mill.

The representatives of rolling mills are various types of Raymond machines. Mineral powder materials are rolled into powder between the grinding roller and the grinding ring, and the processed particle size range is about 44 microns. In addition, there are micropowder mills with similar structures Machine, its processing particle size range is about 10 microns. The advantage of the Raymond machine is low energy consumption. The disadvantage is that the machine is easy to wear and tear, and it is difficult to perform ultra-fine processing on materials with a hardness of more than seven grades.

The impact mill is generally a single-disk pulverizer. Its structure is that a single high-speed rotating disc is installed in the casing, and impact blades are evenly installed on the wheel diameter of the rotary disc. Disintegration and re-crushing, due to the structural and performance limitations of the motor, bearings, and turntable wheel materials, the linear velocity of the impact blade on the single turntable wheel diameter cannot exceed 110 m/s, the linear velocity is limited, and the crushing function is limited. , As a result, the momentum of finer powder products has been curbed. Generally, only powder materials of 800 mesh to 1250 mesh (15 to 10 microns) can be obtained.

The nail-disc impact mill is a variant of the single-rotary disc grinder. In order to obtain higher impact speeds, two double-drive nail-disk mills that can rotate in reverse are designed and manufactured on the basis of a single nail-disk. Mesh with each other and have a spacious grinding cavity space. Since the relative speed between the two nail hammer grinding areas exceeds 200 m/s, the material is repeatedly impacted and crushed between the two nail discs, and is discharged along the radial crushing area. This double-drive nail-on-disc mill is mainly used for ultra-fine particle size processing, and the fineness of powder materials reaches 2 microns to 5 microns. The diameter of the material must be within 3mm, and the material must be crushed many times before it can be used in the double-drive nail-disc mill.

Due to various reasons, the above-mentioned mechanical grinding equipment cannot meet the production requirements of high-mesh fineness and high-efficiency powder materials. Therefore, it is necessary to design and manufacture mineral powder grinding equipment with higher work efficiency to meet the needs of production.

(3) Contents of the invention:

In view of the shortcomings of the above-mentioned mechanical grinding equipment, the present invention designs a micropowder impact mill capable of producing 3-micron powder materials and a powder processing system using the micropowder impact mill.

The micro-powder impact mill that can achieve the above purpose is installed horizontally in the casing that can generate a negative pressure effect. The opposite front and back nail plates rotate in opposite directions. The material interface, its special feature is: there is also a front and back cone coaxially linked with the front and back nail discs in the cavity of the front and back nail discs. There are material acceleration grooves arranged obliquely on the surface from the bottom to the top of the cone, and the material acceleration grooves on the peripheral surface of the front and back cones are obliquely opposite; the feeding interface is on both sides of the front and back nail plates, and the feeding interface passes through The shaft-side gaps of the front and back nail discs communicate with the inner cavities of the front and back nail discs.

The top of the front and back cones (the outlet of the material acceleration groove) area forms the primary crushing area of the present invention, in the primary crushing area, the material accelerated by the material acceleration groove can be at a high speed of 200 m/s to 220 m/s Collision, the material is broken up and crushed. Under the action of negative pressure, the crushed material enters the crushing area of the front and back nail discs, and in the secondary crushing area, the material that has been crushed in the first stage is crushed with the nail hammer at a high speed of 240 m/s to 300 m/s. Collision can form ultrafine powder with D ₉₇ ≤ 3 microns.

There are 1/1, 2/1, 3/2, and 3/3 structures of hammers in the secondary crushing area: 1/1 structure is a row (circle) of nail hammers on each side of the nail plate; 2/1 structure is nails on one side One row (circle) of maces on one plate, two rows (circles) of maces on one side; 3/2 structure is two rows (circles) of maces on one side, three rows (circles) of maces on one side; 3/3 structure is each side Each nail plate has three rows of hammers.

The longer the path of the material acceleration groove, the lower the unit energy consumption for materials to accelerate forward along the material acceleration groove, so the material acceleration groove chooses a spiral groove, and the path of the spiral groove is longer than that of the inclined groove.

The surface of the spiral groove is coated with a diamond material layer, which can effectively prevent the wear of the material on the spiral groove, and at the same time improve the purity of the processed powder.

In order to provide materials from both sides to the inner cavity of the front and back nails at a uniform speed, the invention is also equipped with a material distribution mechanism, which includes a material bin and a screw rod, wherein the material bin is located above the casing, and the screw driven by the motor The rod lies horizontally in the material bin, and the two sides of the screw rod have reverse helixes, which can transport the materials in the material bin to both sides when rotating. The feeding interface is connected.

The above-mentioned two feed ports are also respectively connected with air guide pipes, and the negative pressure air leads from the feed port to the inner cavity of the front and back nail trays, which is beneficial to better carry the materials into.

The powder processing system using the micropowder impact mill of the present invention includes a crusher, a hoist, a storage hopper, a superfine classifier, a collector and an induced draft fan. According to the process flow, the connection mode of each facility is as follows: the discharge port of the crusher is connected to the feed port of the elevator, the discharge port of the elevator is connected to the inlet of the storage hopper, and the outlet of the storage hopper is connected to the material bin in the micro-powder impact mill. The inlet, the outlet port of the micro-powder impact mill is connected with the superfine classifier through the pipeline, the superfine classifier is connected with the collector through the pipeline, and the collector is connected with the induced draft fan through the pipeline. In the powder processing system, the negative pressure effect of the micro powder impact mill is generated by the induced draft fan through the pipeline connected with it.

The outlet of the storage hopper is preferably connected to the material bin through the screw feeder to realize uniform feeding.

In the powder processing system, the unqualified powder is returned from the ultra-fine classifier to the micro-powder impact mill for further processing. The return method is that the return port of the ultra-fine classifier communicates with the material bin through the screw feeder.

In the powder processing system, the collector is divided into one level or two levels, and the first level collector only uses a bag collector; while in the two level collector, the first level collector is a cyclone collector, The second stage collector is a bag collector, which can collect finer powder than the cyclone collector. The connection method of the two-stage collector is: the cyclone collector is connected with the bag collector through the pipeline, the pipeline of the ultra-fine classifier is connected with the cyclone collector, and the pipeline of the induced draft fan is connected with the bag collector.

In order to reduce the whistling noise of the powder processing system, a muffler can be installed on the air guide pipe of the micro-powder impact mill and the air outlet pipe of the induced draft fan.

The powder processing system also includes an electrical control system. The electrical control system is connected with the crusher, hoist, micro-powder impact mill, ultra-fine classifier, collector, and induced draft fan through circuits to realize automatic control operations.

Advantages of the present invention:

1. In the micro-powder impact mill of the present invention, the material accelerates and collides along a specific helical groove under the action of negative pressure wind force, and can reach a relative speed of 200 m/s to 300 m/s, which is a mechanical high-speed impact mill. double.

2. Since the micro-powder impact mill of the present invention has a compact two-stage crushing structure, the crushing efficiency of materials is further improved, and the crushing ratio can reach more than 2,000.

3. The surface of the spiral groove of the primary crushing structure is made of diamond material, which effectively prevents the pollution of the grinding medium to the product.

4. Due to the high-speed collision and crushing of materials, the micro-powder impact mill of the present invention can process brittle materials with a hardness below 8.5 on the Mohs scale.

Due to the above advantages, the present invention has the characteristics of mechanical mill and jet mill in actual operation.

(4) Description of drawings:

Fig. 1 is a schematic structural view of an embodiment of the micropowder impact mill of the present invention.

Fig. 2 is a schematic structural view of an embodiment of the powder processing system of the present invention.

Drawing number identification: 1. Feed interface; 2. Discharge interface; 3. Housing; 4. Positive nail plate; 5. Reverse nail plate; 6. Positive cone; 7. Reverse cone; 8. Material bin; 9. Screw rod; 10. Air duct; 11. Micropowder impact mill; 12. Crusher; 13. Elevator; 14. Storage hopper; 15. Superfine classifier; 16. Induced fan; 18. Spiral feeding machine; 19. Cyclone collector; 20. Bag collector; 21. Muffler; 22. Electrical control system; 23. Rotary shaft.

(5) Specific implementation methods:

In the embodiment shown in Figure 1, the vertical casing 3 of the micropowder impact mill 11 of the present invention is fixedly installed on the frame, and the bearing positions on the left and right sides of the casing 3 are horizontally arranged with a rotating shaft 23. One shaft end of the rotating shaft 23 stretches into the casing 3, and the other shaft end of the rotating shaft 23 is coaxially fixed to the belt pulley, and is connected with the belt pulley of the motor mounted on the frame by a belt. Both sides of the casing 3 are also provided with a vertical feeding interface 1, the side of the feeding interface 1 is connected to the air duct 10, and the bottom opening of the feeding interface 1 is connected to the casing through the shaft side gap between the rotating shaft 23 and the casing 3. 3 are connected, and the discharge interface 2 of the casing 3 is located at the bottom of the casing 3 .

As shown in Figure 1, the shaft ends of the rotating shaft 23 in the casing 3 are respectively coaxially fixed with the positive nail disc 4 and the reverse nail disc 5, and the positive nail disc 4 and the reverse nail disc 5 are in the shape of a cone with an increased relative taper. , the hammers on the end faces of the cone match each other to form a grinding area. The opposite positive cone 6 and reverse cone 7 are coaxially fixed in the cone inner cavity of the positive nail plate 4 and the reverse nail plate 5, and the taper of the positive cone 6 and the reverse cone 7 is the same as that of the positive nail plate 4 and the reverse nail plate. The taper of 5 is the same, on the cone surface of the cone, there are spiral grooves arranged in the same direction from the bottom of the cone to the top, the direction of the spiral grooves on the forward cone 6 and the reverse cone 7 is opposite, and the grooves of the spiral grooves A diamond material layer is attached to the surface, and a material impact area is formed at the top of the forward cone 6 and the reverse cone 7, that is, at the exit of the spiral groove. There is a gap between the forward cone 6 and the reverse cone 7 and the positive nail disc 4 and the reverse nail disc 5 , which communicates with the axial side gap between the rotating shaft 23 and the casing 3 .

As shown in Figure 1, a material distribution mechanism is installed above the top of the casing 3, and the material distribution mechanism is composed of a material bin 8 and a screw rod 9. Outlet, the outlet of the material bin 8 is connected to the upper opening of the feed interface 1 on both sides; the screw rod 9 driven by the motor is horizontally installed in the inner cavity of the material bin 8, and the two sides of the screw rod 9 are respectively provided with reverse spirals.

In the embodiment shown in Figure 2, the HCM micropowder processing system of the present invention is mainly composed of a micropowder impact mill 11, a crusher 12, an elevator 13, a storage hopper 14, an ultrafine classifier 15, a cyclone collector 19, and a bag collection Composed of facilities such as device 20 and induced draft fan 16, arranged according to the process flow, crusher 12, elevator 13, storage hopper 14, micro-powder impact mill 11, ultra-fine classifier 15, cyclone collector 19, bag collector 20 and The induced draft fans 16 are installed sequentially from left to right: the outlet of the crusher 12 is connected to the inlet at the bottom of the elevator 13, the outlet at the top of the elevator 13 is connected to the inlet of the storage hopper 14, and the outlet of the storage hopper 14 is connected to the micropowder The inlet of the material bin 8 of the material distribution mechanism in the impact mill 11, the discharge interface 2 of the casing 3 in the micro-powder impact mill 11 communicates with the ultra-fine classifier 15 through the pipeline, and the ultra-fine classifier 15 communicates with the cyclone through the pipeline. The collector 19 communicates, the cyclone collector 19 communicates with the bag collector 20 through the pipeline, and the bag collector 20 communicates with the induced draft fan 16 through the pipeline.

As shown in Figure 2, the HCM micropowder processing system of the present invention also includes a horizontally installed screw feeder 17 and a screw feeder 18, and the screw feeder 17 is connected between the outlet of the storage hopper 14 and the inlet of the material bin 8, The screw feeder 18 is connected between the inlet of the material bin 8 and the feed inlet of the superfine classifier 15, and a muffler 21 is installed on the air guide pipe 10 and the outlet pipe of the induced draft fan 16.

Micro powder impact mill 11, crusher 12, hoist 13, storage hopper 14, ultra-fine classifier 15, cyclone collector 19, bag collector 20, induced draft fan 16 and other equipment are all connected to the electrical control system through circuits.

Below in conjunction with the embodiment shown in Figure 1 and Figure 2, briefly describe the working process of the HCM micropowder processing system of the present invention:

As shown in Figure 2, the material (such as calcite) is crushed into powder particles with a maximum diameter of about 10mm in the crusher 12, and is transported to the storage hopper 14 through the hoist 13 for storage, and the material particles in the storage hopper 14 are produced. The screw feeder 17 is transported to the micro powder impact mill 11 .

As shown in Figure 1, the material particles enter the material bin 8 through the entrance, and are distributed to both sides by the screw rod 9. Driven by the negative pressure air, they enter the positive nail plate 4 and the reverse nail plate through the feed interface 1 and the shaft side gap. 5 in the inner cavity of the cone, and reach the helical groove of the forward cone 6 and the reverse cone 7, driven by the motor, the reverse high-speed rotation of the forward cone 6 and the reverse cone 7 cooperate with the wind force to make the material particles Gradually accelerate in the spiral groove, and form a collision speed of 200 m/s to 220 m/s in the primary area of the spiral groove outlet on the top of the positive cone 6 and the reverse cone 7, and the powder after primary crushing The body enters the secondary crushing area between the positive nailing disc 4 and the reverse nailing disc 5 hammers due to the negative pressure air, forming a collision speed of 240-300 m/s in the secondary crushing area. The powder after the two-stage pulverization enters the ultra-fine classifier 15 from the outlet port 2 of the micro-powder impact mill 11 through the pipeline.

As shown in Figure 2, under the sub-sieve of the ultra-fine classifier 15, the qualified powder products are introduced into the cyclone collector 19 through the pipeline, and the unqualified powder products are returned to the micro-powder impact mill 11 through the screw feeder 18 Continue to pulverize in the middle, the qualified powder product is collected at the discharge port at the bottom of the cyclone collector 19, and the finer powder product is introduced into the bag collector 20 through the pipeline, and is discharged at the bottom of the bag collector 20. Material port collection.

The material crushing and material collection of the whole system are all completed under negative pressure, and the negative pressure of the system is realized by the suction of the induced draft fan 16.

Claims (10)

1, micro mist impacts grinding machine, comprise have charging interface (1) and discharging interface (2) and can produce the casing (3) of underbalance effect and in casing (3) level be oppositely arranged and the positive and negative nail dish (4,5) of reverse rotation, it is characterized in that: also be provided with in positive and negative nail dish (4, the 5) inner chamber and (4,5) coaxial interlock of positive and negative nail dish and relative positive and negative cone (6,7), quicken groove from cone base to the material that the top offers arranged askew on the side face of positive and negative cone (6,7), it is opposite that the material of described positive and negative cone (6,7) quickens the groove direction; Charging interface (1) is in the both sides of positive and negative nail dish (4,5), and communicates with the inner chamber of positive and negative nail dish (4,5) by the axle side clearance of positive and negative nail dish (4,5); The material of positive and negative cone (6,7) quickens the groove exit region and forms one-level pulverizing district, the nail hammer milling zone of positive and negative nail dish (4,5) forms secondary and pulverizes the district, secondary is pulverized district's nail hammer 1/1,2/1,3/2,3/3 version, described 1/1 structure is each row of every leader pin dish or circle nail hammer, 2/1 structure is a leader pin dish one row or circle nail hammer, a leader pin dish two rows or circle nail hammer, 3/2 structure is a leader pin dish two rows or circle nail hammer, a leader pin dish three rows or circle nail hammer, and 3/3 structure is each three row's nail hammer of every leader pin dish.

2, micro mist according to claim 1 impacts grinding machine, it is characterized in that: it is helix groove that material quickens groove.

3, micro mist according to claim 2 impacts grinding machine, it is characterized in that: be coated with the diamond material layer on the helix groove face.

4, impact grinding machine according to any described micro mist in the claim 1～3, it is characterized in that: micro mist impacts grinding machine and also comprises feeding distribution mechanism, feeding distribution mechanism comprises material bin (8) and screw rod (9), wherein material bin (8) is positioned at casing (3) top, the screw rod (9) that both sides have reverse acting spiral is lying in the material bin (8), and material bin (8) outlet on screw rod (9) both sides is communicated with charging interface (1) respectively.

5, micro mist according to claim 4 impacts grinding machine, and it is characterized in that: charging interface (1) is also connected guide duct (10).

6, the powder system of processing, comprise that micro mist as claimed in claim 5 impacts grinding machine (11), it is characterized in that: also comprise disintegrating machine (12), elevator (13), storage bin hopper (14), superfine classifier (15), gatherer and air-introduced machine (16), the discharging opening of disintegrating machine (12) is communicated with the feeding mouth of elevator (13), the discharging opening of elevator (13) is communicated with the inlet of storage bin hopper (14), the outlet of storage bin hopper (14) is communicated with the import of material bin (8), the outlet of casing (3) is communicated with superfine classifier (15) by pipeline, superfine classifier (15) is communicated with gatherer by pipeline, and gatherer is communicated with air-introduced machine (16) by pipeline.

7, powder system of processing according to claim 6 is characterized in that: the outlet of storage bin hopper (14) is communicated with material bin (8) by screw(-type) feeder (17), and superfine classifier (15) also is communicated with material bin (8) by spiral feed back machine (18).

8, powder system of processing according to claim 6, it is characterized in that: gatherer is divided into one-level or two-stage, and the one-level gatherer is bag collector (20); First order gatherer in the two-stage gatherer is cyclone collector (19), second level gatherer is bag collector (20), cyclone collector (19) is communicated with bag collector (20) by pipeline, the pipeline of superfine classifier (15) is communicated with cyclone collector (19), and the pipeline of air-introduced machine (16) is communicated with bag collector (20).

9, powder system of processing according to claim 6 is characterized in that: on the discharge pipe of guide duct (10) and air-introduced machine (16) silencer (21) is installed all.

10, powder system of processing according to claim 6, it is characterized in that: also comprise electrical apparatus control system (22), it is characterized in that: electrical apparatus control system (22) is connected with air-introduced machine (16) by circuit and disintegrating machine (12), micro mist impact grinding machine (11), elevator (13), superfine classifier (15), gatherer.

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