CN104984790B - A kind of Wet-dry agitating ball mill - Google Patents

Abstract

The invention discloses a dry-wet dual-purpose stirring ball mill, which comprises a stirring ball milling device and a dry material feeding device. The stirring ball milling device includes a stirring barrel and a stirring ball milling mechanism. There is a dry material outlet, and the side wall of the mixing tank is provided with a slurry inflow pipe and a slurry outflow pipe; the stirring ball mill mechanism includes a driving motor, a stirring shaft, a first spiral ribbon and a second spiral ribbon, and the first spiral ribbon is wound on the On the stirring shaft and fixed with the stirring shaft, the second ribbon is sleeved outside the first ribbon, and the second ribbon is connected to the stirring shaft through a connecting rod. The first ribbon is a left-handed ribbon, and the second ribbon is a right-handed ribbon. The spiral belt, the lower end of the stirring shaft penetrates into the barrel cover, the scraper plate is fixed on the stirring shaft, the first spiral ribbon and the second spiral ribbon are both located in the stirring barrel. The invention enhances the shearing, friction and grinding performance required by materials, achieves the purpose of homogeneous crushing of materials, has high crushing efficiency, and can crush both dry and wet materials.

Description

A wet and dry mixing ball mill

technical field

The invention relates to a stirring ball mill, in particular to a dry-wet dual-purpose stirring ball mill.

Background technique

Stirring ball mill is a device that makes the grinding medium and medium ball move to produce impact, shear, and grinding, so as to crush materials. It is mainly used for grinding fine-grained materials. Due to the large processing capacity of the stirring ball mill and the ability to process minerals with small particle sizes well, it is widely used in the mineral processing industry. However, with the intensification of the consumption of high-quality mineral resources, poor, fine, and miscellaneous refractory minerals have become the main objects of development and utilization, and the existing stirring ball mills will have the following problems when processing these minerals: (1) due to the existing The stirring ball mill is mainly composed of a stirring shaft and multiple stirring blades or multiple stirring rods installed on the stirring shaft, and there is a large distance between two adjacent stirring blades or two adjacent stirring rods, so that during the stirring process , due to the difference in velocity gradient between the medium balls, the force between the medium ball and the mineral particles farther away from the stirring blade or stirring rod is reduced, resulting in the inability to achieve homogenization in mineral crushing; (2) single action, low efficiency, The treatment effect on fine-grained materials is poor. Studies have shown that when crushing materials with particle fineness exceeding 200 meshes, the degree of reduction in mineral particle size is very limited, and the energy input by crushing is mostly used to generate new surfaces for mineral particles. (3) The versatility is poor, most of them are dry-type agitating ball mills or wet-type agitating ball mills with a single function. Dry minerals and ore pulp are processed; (4) The mineral feeding is intermittent feeding, and the feeding is discontinuous. Usually, the materials to be crushed are fed into the mixing tank at one time before crushing, and all are poured out after stirring. Stopped start and stop of the mixing ball mill has a certain impact on the service life of the mixing ball mill, and affects the mixing efficiency, and can also cause abnormal crushing due to too little or too much material.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and to provide a wet and dry agitating ball mill, which has a simple structure, a scientific and reasonable design, and is easy to operate. It can realize the microcirculation of the material inside the agitating mill, and enhance the The required shearing, friction and grinding performance can achieve the purpose of homogenizing and crushing the materials. The crushing efficiency is high, and both dry and wet materials can be crushed.

In order to achieve the above object, the technical solution adopted in the present invention is: a wet and dry agitating ball mill, characterized in that it includes a stirring ball milling device and a dry material feeding device for delivering dry materials to the agitating ball milling device, and the agitating ball milling device The device includes a mixing tank and a mixing ball mill mechanism installed on the cover of the mixing tank. The cover of the mixing tank has a dry material feeding port, and the bottom of the mixing tank has a dry material outlet. The dry material The material outlet is provided with a material door, and the side wall of the mixing tank is provided with a slurry inflow pipe and a slurry outflow pipe, and the slurry inflow pipe and the slurry outflow pipe are respectively located on both sides of the mixing tank. The outflow pipe is located above the slurry inflow pipe, and the outlet of the dry material feeding device is connected to the dry material feeding port; the stirring ball mill mechanism includes a drive motor, a stirring shaft, a first spiral belt and a second spiral belt , the output shaft of the drive motor is fixedly connected to the upper end of the stirring shaft, the first spiral ribbon is wound on the stirring shaft and fixed integrally with the stirring shaft, the second spiral ribbon is sleeved outside the first spiral ribbon, so The second spiral ribbon is connected to the stirring shaft through a connecting rod, the first spiral ribbon is a left-handed spiral ribbon, the second spiral ribbon is a right-handed spiral ribbon, and the lower end of the stirring shaft penetrates into the lid of the mixing tank and It is rotatably connected with the bottom of the mixing tank, and the stirring shaft is rotatably connected with the lid of the mixing tank. A scraper is fixed on the stirring shaft and the scraper is close to the bottom of the mixing tank. The first ribbon and Both the second ribbons are located in the mixing barrel, and the first ribbon and the second ribbons are both located above the scraper.

The above-mentioned agitating ball mill for wet and dry is characterized in that: the dry material feeding device includes a screw feeder and a discharge bin, and the discharge port of the discharge bin is connected to the feed port of the screw feeder , the discharge port of the screw feeder is connected with the dry material feed port.

The aforementioned agitating ball mill for wet and dry use is characterized in that: one end of the connecting rod is connected to the stirring shaft through a pin, and the other end of the connecting rod is connected to the second ribbon through a rivet.

The aforementioned wet and dry agitating ball mill is characterized in that: the central axis of the stirring shaft, the central axis of the first spiral ribbon and the central axis of the second spiral ribbon are all coincident.

The aforementioned wet and dry agitating ball mill is characterized in that: the first ribbon is a conical ribbon with a larger top and a smaller bottom.

The above-mentioned agitating ball mill for wet and dry is characterized in that: the cross-sectional shape of the first spiral band is trapezoidal, the pitch of the first spiral band is 60 mm to 95 mm, and the thread of the first spiral band rises The angle is 23°～35°.

The above-mentioned agitating ball mill for wet and dry is characterized in that: the cross-sectional shape of the second helical band is trapezoidal, the pitch of the second helical band is 80mm-135mm, and the thread of the second helical band rises The angle is 18°-27°, and the width of the second ribbon is 45mm-55mm.

The aforementioned wet and dry agitating ball mill is characterized in that the ratio of the inner diameter of the second spiral ribbon to the maximum outer diameter of the first spiral ribbon is 6:5.

The aforementioned wet and dry mixing ball mill is characterized in that: the cross-sectional shape of the mixing tank is circular, and the outer diameter of the second ribbon is 5/6-6/7 of the inner diameter of the mixing tank.

The aforementioned agitating ball mill for wet and dry use is characterized in that: the inner diameter of the mixing barrel is 1/2 to 3/5 of the height of the mixing barrel.

Compared with the prior art, the present invention has the following advantages:

1. The present invention uses a stirring ball mill mechanism to stir the material and the medium ball, realizing the three-dimensional circulation of the medium ball and the material inside the mixing tank, especially the first and second spiral ribbons with opposite rotation directions are strengthened during the rotation process The stripping and squeezing action in the crushing process is eliminated; the connecting rod connected with the second ribbon enhances the microcirculation of the internal three-dimensional circulation, and this microcirculation is transformed into medium balls and materials under the transverse shearing action of the connecting rod. The shearing and peeling effect between them; the strengthening of these two effects makes the particle size of the material decrease more rapidly during the crushing process.

2. The structure design of the present invention is scientific and reasonable, which can effectively solve the problem of single function and low efficiency of the existing grinding equipment, and realize the microcirculation of the material inside the stirring mill through the different rotations of the first and second spiral belts, and enhance the It improves the shearing, friction and grinding performance required for fine particle crushing, and at the same time, the homogenized crushing ensures that the particles are strengthened in the vertical direction during the longitudinal relative movement, reducing the incomplete crushing of particles caused by forces in all directions. .

3. The invention adapts to the requirements of feeding and discharging of dry and wet materials by setting the dry material feeding port, the dry material discharging port, the slurry inflow pipe and the slurry outflow pipe on the mixing tank, and the dry and wet grinding The mode can be switched freely, which broadens the limitation that the existing grinding equipment can only process a single type of material, and increases the adaptability of the equipment.

4. The present invention conveys the dry material through the screw feeder and the discharge bin, which can realize continuous feeding, and can also adjust the feeding rate according to the holding capacity of the material in the mixing tank to ensure the mass balance of the dry material in the mixing tank , to avoid abnormal crushing caused by too little or too much material.

5. The scraping plate fixed on the stirring shaft of the present invention can not only play the role of scraping and unloading during the crushing process of dry materials, but also enhance the microcirculation of the internal three-dimensional circulation. Under the transverse shearing action of the scraping plate This microcirculation is transformed into the shearing and peeling effect between the medium ball and the material; and during the pulp crushing process, the larger particles that sink to the bottom of the ball mill cylinder can be scraped up to ensure the uniformity of crushing.

6. The present invention has good overall rigidity, can withstand strong loads, has high equipment capacity, large continuous processing capacity, uniform product particle size, and can effectively ensure material purity; continuous and balanced stirring, high grinding degree of ore particles, and long ribbon life .

7. The present invention can be fully applied to the fine grinding and crushing of fine-grained and micro-fine-grained materials. While being suitable for the crushing of "lean, fine, and miscellaneous" minerals, it is also suitable for the separation and enrichment of fine-grained coal rock components in the coal preparation industry. Set, as well as the preparation process of ultrafine powder in chemical industry, papermaking, environment, medicine and other engineering industries.

8. The functional parts of the present invention are simple, easy to process and produce, and all easy-wearing parts are installed in a detachable manner, which is convenient for replacement.

The present invention will be described in further detail below with reference to the accompanying drawings and examples.

Description of drawings

Fig. 1 is the front view of the present invention.

Fig. 2 is a bottom view of the present invention.

Fig. 3 is a schematic structural view of the agitating ball mill mechanism of the present invention without the drive motor.

Fig. 4 is a graph showing the particle size distribution of grinding products crushed by common grinding equipment.

Fig. 5 is a graph showing the particle size distribution of the grinding product crushed by the present invention.

Explanation of reference signs:

1—screw feeder; 2—feeding bin; 3—mixing barrel;

4—dry material outlet; 5—slurry inflow pipe; 6—slurry outflow pipe;

7—drive motor; 8—stirrer shaft; 9—first spiral belt;

10—the second ribbon; 11—connecting rod; 12—scraping plate;

13—Material door.

Detailed ways

As shown in Figures 1 to 3, the present invention includes a stirring ball milling device and a dry feed device for delivering dry materials to the stirring ball milling device. Stirring ball mill mechanism, the lid of the mixing tank 3 has a dry material feeding port, the bottom of the mixing tank 3 has a dry material outlet 4, and the dry material outlet 4 is provided with a material door 13, The side wall of the mixing tank 3 is provided with a slurry inflow pipe 5 and a slurry outflow pipe 6, the slurry inflow pipe 5 and the slurry outflow pipe 6 are respectively located on both sides of the mixing tank 3, and the slurry flows out The pipe 6 is located above the slurry inflow pipe 5, and the discharge port of the dry material feeding device is connected to the dry material feeding port; the agitating ball mill mechanism includes a drive motor 7, an agitating shaft 8, a first spiral belt 9 and The second spiral ribbon 10, the output shaft of the drive motor 7 is fixedly connected to the upper end of the stirring shaft 8, the first spiral ribbon 9 is wound on the stirring shaft 8 and fixed as a whole with the stirring shaft 8, the second spiral ribbon 10 is set outside the first spiral band 9, the second spiral band 10 is connected with the stirring shaft 8 through a connecting rod 11, the first spiral band 9 is a left-handed spiral band, and the second spiral band 10 is a right-handed Ribbon, the lower end of the stirring shaft 8 penetrates the bung of the mixing bucket 3 and is rotatably connected with the bottom of the mixing bucket 3, the agitating shaft 8 is rotatably connected with the bung of the mixing bucket 3, and the agitating shaft 8 is fixed There is a scraper 12 and the scraper 12 is close to the bottom position of the mixing tank 3, the first ribbon 9 and the second ribbon 10 are all located in the mixer 3, the first ribbon 9 and the second ribbon The belts 10 are all located above the scraper 12 .

As shown in Figures 1 and 2, the dry material feeding device includes a screw feeder 1 and a discharge bin 2, and the discharge port of the discharge bin 2 is connected with the feed inlet of the screw feeder 1, so The discharge port of the screw feeder 1 is connected with the dry material feed port.

In this embodiment, one end of the connecting rod 11 is connected to the stirring shaft 8 by a pin, and the other end of the connecting rod 11 is connected to the second ribbon 10 by a rivet, and the second ribbon is solved by the pin connection. 10 The replacement problem caused by excessive wear is easy to replace; the vertical position of the second ribbon 10 is guaranteed to be fixed by means of rivet connection.

In this embodiment, the central axis of the stirring shaft 8, the central axis of the first spiral ribbon 9 and the central axis of the second spiral ribbon 10 are all coincident, which ensures that the overall force on the stirring shaft 8 is uniform, which is conducive to the effective transmission of force .

As shown in Figures 1 and 2, the first spiral belt 9 is a conical spiral belt with a large upper part and a smaller lower part, which can convey the upper material downwards in a gradually decreasing manner, and this conveying method can prevent the lower material from accumulating Too much and the second ribbon 10 is blocked.

In this embodiment, the cross-sectional shape of the first ribbon 9 is trapezoidal, the pitch of the first ribbon 9 is 60 mm to 95 mm, and the lead angle of the first ribbon 9 is 23° to 35° ; The trapezoidal profile ensures the edge strength of the first spiral band 9 .

In this embodiment, the cross-sectional shape of the second ribbon 10 is trapezoidal, the pitch of the second ribbon 10 is 80 mm to 135 mm, and the lead angle of the second ribbon 10 is 18° to 27° , the width of the second spiral belt 10 is 45 mm to 55 mm; the wide pitch can ensure the free movement of the medium ball in the system without being stuck, reducing the probability of downtime, and at the same time, the moderate width of the second spiral belt 10 is conducive to the particle With an upward motion, ensure that pellets and media balls are lifted upwards.

In this embodiment, the ratio of the inner diameter of the second ribbon 10 to the maximum outer diameter of the first ribbon 9 is 6:5, and there is a gap between the second ribbon 10 and the first ribbon 9, which reduces the The equipment is shut down due to the media ball jamming.

In this embodiment, the cross-sectional shape of the mixing bucket 3 is circular, and the outer diameter of the second ribbon 10 is 5/6 to 6/7 of the inner diameter of the mixing bucket 3. The barrel 3 maintains a large gap, which ensures the stable and effective operation of the stirring ball mill mechanism.

In this embodiment, the inner diameter of the mixing tank 3 is 1/2 to 3/5 of the height of the mixing tank 3, and the cylinder body with a relatively large length and diameter can increase the size of the medium ball, and the particles will be peeled, ground and sheared during the internal circulation process. Probability, strengthening the peeling and shearing action, and also reducing the space torque of the pin connecting the stirring shaft 8 and the connecting rod 11, ensuring the normal operation of the stirring ball milling mechanism.

In this embodiment, the mixing tank 3 is a solid steel shaft, the first spiral belt 9 and the second spiral belt 10 are both manganese steel spiral belts, and the manganese steel spiral belts can ensure the rigidity and wear resistance of the stirring ball mill mechanism , it is no longer necessary to carry out wear-resistant coating treatment on the stirring device.

The process of pulverizing dry materials by using the wet and dry agitating ball mill of the present invention is as follows: closing the slurry inflow pipe 5 and the slurry outflow pipe 6, and opening the material door 13. Put the dry material into the discharge bin 2, put the medium ball into the mixing tank 3, and send the dry material into the mixing tank 3 through the screw feeder 1. Under the stirring action of the stirring ball mill mechanism, the material particles and the medium ball Do circular motions in the vertical direction. That is, the medium balls and material particles in the outer layer move upward under the lifting action of the second spiral belt 10, while the medium balls and material particles in the inner layer move downward under the push-down action of the first spiral belt 9, and the movement direction is different. The characteristic causes the medium ball and the material particles moving up and down to have a strong peeling and grinding action and shearing action, which leads to the internal stress concentration of the material particles in this process. The scraper 12 enhances the microcirculation of the internal three-dimensional circulation, and under the transverse shearing action of the scraper 12, this microcirculation is transformed into a shearing and peeling action between the media ball and the material. At the same time, the connecting rod 11 connecting the second spiral band 10 and the stirring shaft 8 not only provides power and support for the second spiral band 10, but also enhances the transverse microcirculation of the internal three-dimensional circulation. Under the action of shearing motion, the medium ball and material particles will roll in the horizontal direction near the connecting rod 11, and under the transverse shearing action of the connecting rod 11, this microcirculation is transformed into shear peeling between the medium ball and material particles The function makes the particle size of the material particles decrease more rapidly during the crushing process, and the crushed materials are discharged through the dry material outlet 4 under the rotation of the scraper 12 .

The process of pulverizing ore pulp by using the wet and dry agitating ball mill of the present invention is as follows: closing the material door 13, opening the slurry inflow pipe 5 and the slurry outflow pipe 6. The ore pulp enters the mixing tank 3 through the slurry inflow pipe 5, and under the agitation of the agitating ball mill mechanism, the ore pulp and the medium ball circulate in the vertical direction. That is, the medium balls and pulp in the outer layer move upwards under the lifting action of the second spiral belt 10, while the medium balls and pulp in the inner layer move downwards under the push-down action of the first spiral belt 9, and the anisotropy of the movement leads to The medium ball moving up and down and the ore pulp have a strong stripping and shearing action, which causes the internal stress concentration of the ore pulp to break during this process. The connecting rod 11 connecting the second spiral belt 10 and the stirring shaft 8 enhances the transverse microcirculation of the internal three-dimensional circulation. Under the action of the transverse shearing movement of the connecting rod 11, the medium ball and the ore slurry will be in the horizontal direction near the connecting rod 11. Tumbling movement, under the transverse shearing action of the connecting rod 11, this microcirculation is converted into a shearing and peeling action between the medium ball and the pulp, so that the particle size of the pulp is reduced more rapidly during the crushing process, and the crushed pulp passes through the pulp Material outflow pipe 6 is discharged.

The following is an application example of crushing ore by using the wet and dry mixing ball mill of the present invention:

Implementation Case 1

Choose the clean coal of Zhangjiamao Coal Mine in northern Shaanxi as the research object to carry out the ore grinding test, as shown in the table below, under the same sample amount (2kg) and the same feeding particle size (-0.5mm), the dry and wet two-stage grinding method of the present invention is used On the premise that the particle size of the material is effectively reduced to -37 μm by using the agitating ball mill, the grinding time of the present invention is reduced by 24% compared with ordinary grinding equipment.

Table 1 is the clean coal grinding index corresponding to the ordinary grinding equipment and the dry-wet dual-purpose agitating ball mill of the present invention

Note: The above test data is the average value of five tests

Implementation Case 2

The middle coal of Xiqu Coal Preparation Plant was selected as the research object to carry out the ore grinding test. Under the conditions of the same sample amount (1kg), the same feed particle size (-0.5mm) and the same grinding time (10min), the ore grinding The product is subjected to laser particle size analysis to obtain a particle size distribution curve (as shown in Figure 4 and Figure 5).

It can be seen from the comparison of Fig. 4 and Fig. 5 that the dry-wet dual-purpose agitating ball mill of the present invention has a relatively large yield of -74 μm particle size when the grinding time is short, and a better initial grinding effect is achieved. By enlarging the present invention, a large amount of minerals can be crushed to -74 μm in a short period of time, and the effect of increasing the yield of materials with a particle size of -74 μm is particularly obvious.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. Any simple modifications, changes and equivalent structural transformations made to the above embodiments according to the technical essence of the present invention still belong to the technology of the present invention. within the scope of protection of the scheme.

Claims (8)

1. A kind of 1. Wet-dry agitating ball mill, it is characterised in that：Including stirring ball mill device and for stirring ball mill device The siccative feed device of dry material is conveyed, the stirring ball mill device includes agitator (3) and on agitator (3) bung Stirring ball-milling mechanism, be provided with siccative charge door on the bung of the agitator (3), the bottom of the agitator (3) is provided with dry Expect discharge port (4), be provided with bin gate (13) on the siccative discharge port (4), slurry is provided with the side wall of the agitator (3) Pipe (5) and slurry effuser (6) are flowed into, the slurry flows into pipe (5) and slurry effuser (6) respectively positioned at agitator (3) Both sides, the slurry effuser (6) be located at slurry flow into pipe (5) top, the discharge port of the siccative feed device with it is described Siccative charge door connects；The stirring ball-milling mechanism includes driving motor (7), agitating shaft (8), the first ribbon (9) and the second spiral shell Band (10), the output shaft of the driving motor (7) are fixedly connected with the upper end of agitating shaft (8), and first ribbon (9) is wrapped in It is fixed as one on agitating shaft (8) and with agitating shaft (8), second ribbon (10) is sheathed on the first ribbon (9) outside, and described second Ribbon (10) is connected with agitating shaft (8) by pitman (11), and first ribbon (9) is left-handed ribbon, second ribbon (10) be dextrorotation ribbon, the lower end of the agitating shaft (8) penetrate the bung of agitator (3) and with the lower rotation of agitator (3) Connection, the bung of the agitating shaft (8) and agitator (3) are rotatablely connected, be fixed with the agitating shaft (8) material scraping plate (12) and For material scraping plate (12) close to the bottom position of agitator (3), first ribbon (9) and the second ribbon (10) are respectively positioned on agitator (3) in, first ribbon (9) and the second ribbon (10) are respectively positioned on the top of material scraping plate (12)；First ribbon (9) be from The taper ribbon that feed end is gradually reduced to discharge end outside diameter；The internal diameter and the first ribbon (9) of second ribbon (10) are most The ratio between big outside diameter is 6:5.
2. A kind of 2. Wet-dry agitating ball mill described in accordance with the claim 1, it is characterised in that：The siccative feed device bag Screw(-type) feeder (1) and discharge bin (2) are included, the discharge port of the discharge bin (2) is connected with the feed inlet of screw(-type) feeder (1), The discharge port of the screw(-type) feeder (1) is connected with the siccative charge door.
3. A kind of 3. Wet-dry agitating ball mill described in accordance with the claim 1, it is characterised in that：The one of the pitman (11) End is connected with agitating shaft (8) by pin, and the other end and the second ribbon (10) of the pitman (11) pass through rivet interlacement.
4. A kind of 4. Wet-dry agitating ball mill described in accordance with the claim 1, it is characterised in that：In the agitating shaft (8) The central axes of axis, the central axes of the first ribbon (9) and the second ribbon (10) overlap.
5. A kind of 5. Wet-dry agitating ball mill described in accordance with the claim 1, it is characterised in that：First ribbon (9) Shape of cross section is trapezoidal, and the pitch of first ribbon (9) is 60mm~95mm, the lead angle of first ribbon (9) For 23 °~35 °.
6. A kind of 6. Wet-dry agitating ball mill described in accordance with the claim 1, it is characterised in that：Second ribbon (10) Shape of cross section is trapezoidal, and the pitch of second ribbon (10) is 80mm~135mm, the screw thread liter of second ribbon (10) Angle is 18 °~27 °, and the width of second ribbon (10) is 45mm~55mm.
7. A kind of 7. Wet-dry agitating ball mill described in accordance with the claim 1, it is characterised in that：The horizontal stroke of the agitator (3) Cross sectional shape is circle, and the outside diameter of second ribbon (10) is the 5/6~6/7 of the internal diameter of agitator (3).
8. 8. according to a kind of Wet-dry agitating ball mill described in claim 7, it is characterised in that：The agitator (3) it is interior Footpath is the 1/2~3/5 of the height of agitator (3).