CN113953065B - A combined grinding system with pre-grinding equipment - Google Patents

Abstract

The invention discloses a combined grinding system with pre-grinding equipment, including roller milling equipment, a combined powder separator, a dust collector, a self-sorting ball mill, a dust collector 2 and a fan, and the roller milling equipment and The combined powder separator is connected, the upper outlet of the combined powder separator is connected to the first inlet of the dust collector, the middle outlet of the combined powder separator is connected to the inlet of the self-sorting ball mill, and the outlet of the self-sorting ball mill It is connected with the second inlet of the dust collector; the self-selecting ball mill includes a cylinder body, which is inclined upward from the side of the feed port to the side of the discharge port, and the grinding chamber and the powder selection chamber are arranged in sequence, and the grinding chamber and the powder selection chamber are arranged in between. The main compartment board; the powder selection chamber is equipped with a static powder separator and/or a dynamic powder separator. The invention can collect the pre-sorted fine material, continue to grind and sort the medium and coarse material, and can discharge the qualified fine powder produced in the grinding process in time, reducing the over-grinding of materials in the ball mill, saving the power consumption of grinding, and benefiting Production enterprises save energy and reduce emissions.

Description

A combined grinding system with pre-grinding equipment

technical field

The invention relates to the technical field of grinding, in particular to a combined grinding system with pre-grinding equipment.

Background technique

The ball mill is composed of a barrel and a grinding body. When the barrel of the ball mill rotates, the grinding body is attached to the liner of the barrel and taken away by the barrel due to inertia, centrifugal force, and friction. When it is high, it is thrown down due to its own gravity, and the thrown grinding body crushes the material under the action of gravity and impact force to realize material grinding. Due to its simple structure and good equipment reliability, the ball mill is widely used in building materials, mineral processing, metallurgy, electric power, medicine, food and chemical industries. According to different grinding environments, ball mills can be divided into dry type and wet type; according to different transmission modes, they can be divided into center drive type and edge drive type.

Although the structure of the ball mill is simple, the grinding principle of the ball mill is single-particle impact crushing, and the grinding efficiency is low. When the material is crushed, a large amount of energy is converted into the potential energy of the steel ball and the material lifting, the kinetic energy of the impact between the steel balls and the grinding heat. According to research data, the energy utilization rate of ball mills is less than 5%. Due to the mixed coarse and fine materials in the ball mill, the fine powder that meets the product requirements is easy to agglomerate in the mill, and the agglomerated materials are bonded to the liner to form a cushion. Studies have shown that when the liner cushion is 0.2mm, the impact of the steel ball 80% drop in force. The external manifestation is that the ball mill produces problems such as ball paste and full grinding, which lead to the abnormal production of the ball mill, or the production energy consumption of the ball mill is very high. Zhou Wenliang ("Cement Technology" No. 6, 2014) introduced the technology of grinding ultra-fine cement grouting material with a Φ2.6×13m ball mill. When it uses P·O52.5 cement to produce ultra-fine cement, the mill Ball paste is serious; when all clinker and gypsum are used to grind ultra-fine cement, the output is too low and the power consumption is too high. The final plan adopted is: use 70% P·O52.5, add clinker and 30% gypsum, which can ensure the continuous normal production of the mill; after grinding, add 8% silica fume (specific surface area 2000m ² / kg), and selected into the powder mill together to achieve a specific surface area of the product ≥ 800m ² /kg, the mill runs at 6.8t/h, and the power consumption of the process is as high as 155kW/t.

Therefore, in order to increase the output of the ball mill system and reduce the energy consumption of grinding, the powder separator technology has gradually appeared. The method is: the materials pulverized by the ball mill are sent to the powder classifier through the elevator, so that the qualified materials are selected in time in the powder classifier, and the unqualified materials are returned to the ball mill to continue grinding. The emergence and maturity of the powder separator technology has greatly reduced the power consumption of the ball mill grinding system, but due to the limitation of the process layout, the materials need to be lifted to the top of the powder separator, resulting in more equipment, increased civil construction costs, and high investment costs.

Chinese Patent Publication No. CN201197950 discloses a composite cement mill with internal powder selection and screening, which contains a cylinder body and an internal screening device. The internal screening device includes a grate plate, a coarse powder feed cone, a tubular sieve, and a fine powder feed cone. , Ring tube. One end of the tubular sieve is set on the circumferential surface of the annular tube and communicates with the tube, the other end of the tubular sieve is set on the inner wall of the cylinder, and the annular tube is provided with a coarse powder guide cone and a fine powder guide cone at this end, and also Including sieve plate, ventilation grate plate, material retaining inclined plate. The ventilation grate plate is set at the other end of the annular pipe, the sieve plate is set between the tubular screen and the ventilation grate plate, and one side of the tubular sieve is set on the sieve plate, and the retaining inclined plate is set on the screen surface of the tubular sieve on the outer edge. Its essence is to supplement the function of the partition board, and a grate board is set in front of the original partition board, but there is no substantial function of internal selection and screening.

Chinese Patent Publication No. CN101920219A discloses an internal powder selection device of a dry-process ball mill, which is to install a stainless steel powder selection pipe in the inner cavity of the dry-process ball mill to connect the powder selection connection pipe to the powder selection connection of the grinding tail separation chamber Two pipes in parallel, finished product delivery pipe, collector (cyclone, bag filter group), fan, stainless steel return pipe, ball mill sequence gas, and material closed circuit connection. Using the suction force of the fan, the powder selection pipe selects the finished materials formed at any time in the mill and at the end of the mill in time under negative pressure. Its core is to install a steel pipe in the grinding chamber of the ball mill, and the finished product is selected through the steel pipe under the action of negative pressure. The stainless steel powder selection pipe is installed in the grinding chamber, and the steel ball is easily deformed by the falling of the steel ball, which is not feasible; in addition, the powder is drawn out from the steel pipe due to negative pressure, which does not have the function of powder selection.

In addition, in the current combined grinding system, when the pre-selected medium and coarse materials are continuously ground by a ball mill, if the ball mill adopts an open-flow process, the material will be over-grinded in the ball mill, and the production power consumption will be high. Poor control convenience; if the circular flow process is adopted, the powder classifier needs to be arranged on a platform above the height of the ball mill workshop, and the materials leaving the ball mill need to be fed into the powder classifier through chutes, elevators, etc., and the overall workshop height is greater than twice the height of the ball mill workshop , high investment costs, many auxiliary equipment, high production energy consumption, and difficult maintenance.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a combined grinding system with pre-grinding equipment. The qualified fine powder produced in the mill is discharged in time, reducing the phenomenon of fine powder agglomeration or over-grinding in the ball mill, improving the efficiency of system air use, reducing the energy consumption of system air, reducing the height of the workshop, reducing the investment cost of the grinding system, and reducing the energy consumption of ball mill grinding , improve grinding efficiency, increase energy utilization, and promote energy conservation and emission reduction.

The present invention is achieved in this way, a combined grinding system with pre-grinding equipment, including roller milling equipment, combined powder separator, dust collector 1, self-selecting ball mill, dust collector 2 and fan, the The discharge port of the roller mill equipment is connected with the feed port of the combined powder separator through the elevator, the bottom discharge port of the combined powder separator is connected with the feed port of the roller mill equipment, and the combined powder separator The upper discharge port of the dust collector is connected to the first inlet of the dust collector, the first air outlet of the dust collector is connected to the fan, the middle discharge port of the combined powder separator is connected to the feed port of the self-separating ball mill, and the self-separating The discharge port of the selected ball mill is connected to the second inlet of the dust collector, and the second air outlet of the dust collector is connected to the fan;

The self-sorting ball mill includes a cylinder body, a feed port, and a discharge port. The cylinder body is inclined upward from the feed port side to the discharge port side, and the inclination angle is 2 to 5°; From the mouth to the discharge port, a grinding bin and a powder selection bin are arranged in turn, and a main compartment plate is arranged between the grinding bin and the powder selection bin; a static powder separator and/or a dynamic powder separator are arranged in the powder selection bin .

Preferably, the inner wall of the cylinder of the powder selection bin is provided with a slanted liner, and the angle between the slant liner and the axis of the cylinder is 3-15°.

Preferably, the dynamic powder separator is composed of a rotor, a counterattack cone, a transmission shaft, and a powder separator drive. The blades of the rotor are parallel to the inclined liner in the powder selection chamber, the counterattack cone is fixed on the bottom of the rotor, and the counterattack cone The diameter is the same as the outer diameter of the rotor; the rotor is driven by connecting the powder classifier through a transmission shaft.

Preferably, when only a dynamic powder separator is set in the powder selection chamber, the main compartment plate is provided with a ventilation hole in the central area and grate slits in the surrounding area, and the center of the ventilation hole is connected to the mill barrel. Coaxial, the diameter of the ventilation hole is 0.2 to 0.4 times the diameter of the mill cylinder, the ventilation hole is a mesh structure, and the effective size of the mesh is 10 to 15mm; The diameter of the grate seam near the side of the grinding chamber is 4-10mm, and the diameter of the grate seam near the side of the powder selection chamber is 6-12mm; the diameter of the grate seam near the edge of the main compartment plate is gradually increased from the grinding chamber to the powder selection chamber. It is a strip-shaped grate seam, and the size is 25mm long * 4mm wide; the thickness of the main compartment plate is 20-60mm.

Preferably, when a static powder separator and a dynamic powder separator are set in the powder selection chamber, the static blades of the static powder separator are arranged in a conical shape, and the static powder separator is located between the main compartment plate and the dynamic separator. between powder machines.

Preferably, the static powder classifier includes static blades, the static blades are arranged in a conical shape or arranged parallel to the cylinder axis;

When the static blades are arranged in a conical shape, the angle between the static blades and the axis of the cylinder is 45-65°, and the diameter of the conical section gradually increases from the side of the grinding chamber to the side of the powder selection chamber, and the end of the static blades close to the grinding chamber is fixed on the On the main compartment plate, the other end is fixed on the cylinder; at this time, the inner area where the main compartment plate intersects with the conical static vanes is a blind plate, and the outer area is provided with grate slots; the width of each static vane is 50-300mm, and the relative The gap between two adjacent static blades is 50-400mm;

When the static vanes are arranged parallel to the cylinder axis, one end of the static vanes close to the grinding chamber is fixed on the main compartment plate, and the other end is fixed on the cylinder body; The area is a blind plate, and the outer area is provided with grate slots; the width of each static blade is 50-300mm, and the gap between two adjacent static blades is 100-400mm.

Preferably, a grinding liner is arranged on the inner wall of the cylinder of the grinding bin, and several activation rings are arranged inside the grinding bin.

Preferably, the angle between the feed inlet and the axis of the cylinder is greater than 45°, and an external fixed structure is adopted, which does not rotate with the cylinder.

Preferably, an anti-shock device is provided at the discharge end of the feed inlet, and the anti-shock device is composed of a conical telescopic steel sheet, a light spring and a lifting plate, and the conical telescopic steel The sheet is located on the inner side of the lifting plate, the large-diameter end of the conical telescopic steel sheet is fixed on the lifting plate, and the small-diameter end is connected to the lifting plate through a plurality of light springs; the conical telescopic steel sheet It is formed by stacking a plurality of baffles one by one, and each baffle corresponds to a light spring; the length of the lifting plate is greater than that of the tapered stretchable steel sheet.

The present invention has the following advantages and beneficial effects:

1) The grinding system of the present invention can collect pre-sorted fine materials, continue grinding and sorting medium and coarse materials, and can discharge qualified fine powder produced in the grinding process in time, reducing over-grinding of materials in the ball mill, Saving grinding power consumption is beneficial to energy saving and emission reduction of production enterprises.

2) The grinding system of the present invention can shorten the time for adjusting the quality of finished products, adjust the amount of materials and finished products in the ball mill in real time, efficiently control the yield of finished products, improve production efficiency, and reduce production costs.

3) The self-sorting ball mill of the present invention completes the grinding and sorting of materials in the ball mill, without the need for an external powder separator, which can effectively reduce the height of the plant and the floor space, and reduce auxiliary equipment such as elevators and conveying chutes. Save investment costs, reduce equipment failure rates, and reduce production and maintenance costs.

4) The self-sorting ball mill of the present invention can integrate grinding and sorting, reduce the process flow, improve the system air efficiency, reduce the air volume by 50-70% compared with the traditional circulation system, and reduce the system air energy consumption.

5) In the self-sorting type ball mill of the present invention, the powder separator and the ball mill are on the same horizontal plane, and the height of the powder separator of the traditional circular flow system is 2 to 3 times that of the ball mill. Therefore, compared with the traditional circular flow (ball mill+powder separator ) system, using the self-sorting ball mill of the present invention, the height at which materials are lifted is reduced, the potential energy to be overcome is reduced, and the energy consumption of system production is saved.

6) The self-sorting ball mill of the present invention cancels the auxiliary equipment such as the elevator, the conveying chute and the conveying chute, reduces the pollution points of running, emitting, dripping and leaking in the system, reduces the disorderly discharge of dust, and is beneficial to clean production and environmental protection. Protect.

Description of drawings

Fig. 1 is a flow chart of a combined grinding system with pre-grinding equipment provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the self-sorting ball mill provided by Embodiment 1 of the present invention;

Fig. 3 is a front view of the main compartment plate provided by Embodiment 1 of the present invention;

Fig. 4 is a cross-sectional view of the main compartment plate provided by Embodiment 1 of the present invention;

Fig. 5 is a schematic structural view of the anti-shock device provided by Embodiment 1 of the present invention;

Fig. 6 is a schematic structural diagram of the activation ring provided by Embodiment 1 of the present invention;

Fig. 7 is a schematic structural view of a self-sorting ball mill provided in Embodiment 2 of the present invention;

Fig. 8 is a front view of the main compartment plate provided by Embodiment 2 of the present invention;

Fig. 9 is a cross-sectional view of the main compartment plate provided by Embodiment 2 of the present invention;

Fig. 10 is a schematic structural view of a self-sorting ball mill provided in Embodiment 3 of the present invention;

Fig. 11 is a front view of the second main compartment plate provided by the third embodiment of the present invention;

Fig. 12 is a cross-sectional view of the second main compartment plate provided by the third embodiment of the present invention.

In the figure: 1. The first elevator; 2. The buffer bin; 3. Roller mill equipment; 4. The second elevator; 5. Combined powder separator; 6. Dust collector 1; 8. Fan 1; 9. Dust collector 2; 11. Fan 2;

10. Cylinder; 101. Feed inlet; 102. Discharge port; 103. Dust collection port;

20. Grinding bin; 201. Grinding liner; 202. Activation ring;

30. Powder selection bin; 301. Inclined liner; 310. Dynamic powder separator; 311. Rotor; 312. Counterattack cone; 313. Drive shaft; 314. Powder separator drive; 320. Static powder separator; 321. Static blade;

40. Main partition board; 401. Ventilation hole; 402. Grate seam;

50, anti-shock material device; 501, conical retractable steel sheet; 5011, stop piece; 502, light spring; 503, lifting plate.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner" and "outer" are based on those shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Example 1

Please refer to Fig. 1, the present embodiment provides a kind of combined grinding system with pre-grinding equipment, including roller milling equipment 3 (roller press or external circulation vertical mill), combined powder classifier 5, dust collector 1 6. Fan 1 8, self-selecting ball mill 7, dust collector 2 9 and fan 2 11. Wherein, the discharge port of the roller mill equipment 3 (roller press or external circulation vertical mill) is connected with the feed port of the combined powder separator 5 through the second elevator 4, and the bottom outlet of the combined powder separator 5 is The feed port is connected to the feed port of the roller mill equipment 3, the upper discharge port of the combined powder separator 5 is connected to the inlet of the dust collector-6, and the air outlet of the dust collector-6 is connected to the fan-8. The middle outlet of the powder machine 5 is connected to the feed port 101 of the self-sorting ball mill 7, and the outlet 102 of the self-sorting ball mill 7 is connected to the inlet of the dust collector 29, and the air outlet of the dust collector 2 9 is connected to the air outlet of the fan 2 11 connections.

The raw material enters the buffer bin 2 through the first elevator 1, and then enters the roller mill equipment 3. After being crushed by the roller mill equipment 3, it enters the combined powder separator 5 through the second elevator 4, and is sorted by the combined powder separator 5. The final fine material enters dust collector 1 6 and is collected as finished product; the intermediate material is conveyed to self-sorting ball mill 7, and after further grinding and sorting, the finished product after sorting enters dust collector 2 9 and is also collected as finished product; The material returns to the roller mill 3 for crushing again and enters the next joint grinding. The materials obtained from dust collector 1 6 and dust collector 2 9 are mixed into the warehouse as products, and the exhaust gas from dust collector 1 6 and dust collector 2 9 is discharged into the chimney through their respective fans, and finally discharged into the atmosphere.

Please refer to Figures 2 to 6, the self-sorting ball mill includes a cylinder body 10, a material inlet 101, and a material outlet 102. The cylinder 10 is inclined upward from the side of the material inlet 101 to the side of the material outlet 102, and the inclination angle is 2 ~5°; the cylinder 10 is driven to rotate by the mill (not shown in the mill driving figure, specifically, the cylinder 10 can be driven to rotate by gear transmission or other means), and the cylinder 10 is provided with a feeding port 101 To the discharge port 102, a grinding bin 20 and a powder selecting bin 30 are arranged in sequence.

A grinding liner 201 is arranged on the inner wall of the cylinder 10 of the grinding chamber 20, and the grinding lining 201 is parallel to the axis of the cylinder 10; several activation rings 202 are arranged in the grinding chamber 20, which can increase the residence time of the material and prolong the time of the material. The grinding time and the specific structure of the activation ring 202 can be selected according to needs, and this embodiment only shows one of them. The grinding bin 20 is one bin or multiple bins, and when multiple bins are used, partition boards are arranged between each bin.

The inner wall of the cylinder body 10 of the powder selection bin 30 is provided with an inclined liner 301, and the inner diameter of the inclined liner 301 gradually decreases from the feed end of the powder selection bin 30 to the discharge end of the powder selection bin 30. The inclined liner 301 and the The included angle of the cylinder body 10 axis is 3-15°. The powder selection chamber 30 is provided with a dynamic powder separator 310, the dynamic powder separator 310 is composed of a rotor 311, a counter-attack cone 312, a transmission shaft 313, and a powder separator drive 314. The blades of the rotor 311 and the inclined lining The plates 301 are parallel, and the counterattack cone 312 is fixed on the bottom of the rotor 311. The diameter of the counterattack cone 312 is the same as that of the rotor 311. The impact of the powder machine 310 blades; the second is that if the bottom adopts a blind plate structure, the material and gas will impact on the dynamic powder separator 310 at 90 degrees, and there will be no flow diversion when the gas enters the dynamic powder separator 310 blades, and the general wind resistance is large. The rotor 311 is connected to the powder separator drive 314 outside the powder selection bin 30 through a transmission shaft 313. Specifically, the powder separator drive 314 includes a reducer and a motor, and the drive shaft 313 is connected to the motor through a reducer.

A main compartment plate 40 is arranged between the grinding compartment 20 and the powder selection compartment 30, and the thickness of the main compartment plate 40 is 20-60 mm. The main compartment plate 40 is provided with a ventilation hole 401 located in the central area and a grate slit 402 located on the periphery. 0.2 to 0.4 times the diameter, the ventilation hole 401 is a mesh structure, and the effective size of the mesh is 10 to 15 mm; The side of the powder bin 30 becomes larger gradually, the diameter of the grate seam 402 near the side of the grinding bin 20 is 4-10 mm, the diameter of the grate seam 402 near the side of the powder selection bin 30 is 6-12 mm; the diameter of the grate seam near the edge area of the main compartment plate 40 402 is a strip shape, the size is 25mm long * 4mm wide.

The included angle between the feed inlet 101 and the axis of the barrel 10 is greater than 45°, and adopts an external fixed structure, which does not rotate with the barrel 10 .

The discharge end of the feed port 101 is provided with an anti-shock device 50, which is installed on the cylinder body 10 of the ball mill, and is composed of a conical telescopic steel sheet 501, a light spring 502 and a lifter. The conical telescopic steel sheet 501 is located inside the lifting plate 503, the large-diameter end of the conical telescopic steel sheet 501 is fixed on the lifting plate 503, and the small-diameter end is passed through a plurality of lightweight The spring 502 is connected to the lifting plate 503; the conical telescopic steel sheet 501 is formed by stacking a plurality of baffles 5011 in sequence, and each baffle 5011 corresponds to a lightweight spring 502; the conical telescopic steel The cross sections of the sheet 501 and the lifting plate 503 are both circular. The length of the lifting plate 503 is 1.2-1.5 times of the horizontal length of the conical telescopic steel sheet 501 . When the amount of material is large, the lightweight spring 502 is compressed, and each stop piece 5011 of the conical telescopic steel sheet 501 will expand to increase the diameter of the small diameter end, and the material passing area of the anti-flushing device 50 will increase to ensure the smooth passage of the material and reduce the The problem of uneven impact load can realize the uniform distribution of materials in the ball mill, and improve the grinding efficiency of the ball mill; It will return the material to the feed port 101.

The material enters the grinding chamber 20 through the anti-shock device 50 from the feed port 101, and enters the powder selection chamber 30 from the grinding chamber 20. The material is sorted inside and outside the powder selection chamber 30; It is discharged from the discharge port 102 and enters the next process. Under the action of gravity and centrifugal force, the sorted non-finished products return to the grinding chamber 20 for re-grinding and enter the next cycle. The self-sorting ball mill can reduce the over-grinding of the ball mill, reduce the agglomeration or ball paste of fine powder, improve the grinding efficiency, reduce the power consumption of grinding, reduce the height of the plant, save investment costs, and is beneficial to energy conservation and environmental protection.

The grinding system in this embodiment 1 is suitable for materials whose moisture content is less than 2% and the particle size of the finished product is less than 80 μm. It can be used for processing raw materials, cement, coal powder and other materials in the field of building materials, and can also be used in the field of non-metallic mines. Grinding of ultra-fine materials, such as the production of heavy calcium carbonate, talcum powder, etc.

Example 2

Please refer to Figures 7 to 9. The difference from Embodiment 1 is that a static powder separator 320 is also provided in the powder selection chamber 30 of this embodiment, and the static powder separator 320 is located between the main compartment plate 40 and the dynamic Between powder classifiers 310.

The static powder separator 320 includes static blades 321, which are arranged in a conical shape. The angle between the static blades 321 and the axis of the cylinder body 10 is 45-65°. The side of the bin 30 gradually increases. One end of the static vane 321 close to the grinding bin 20 is fixed on the main compartment plate 40, and the other end is fixed on the cylinder body 10. Specifically, the other end is fixed on the inclined liner in the powder selection bin 30. 301, the joints are connected by welding. The ratio of the length of the static vanes 321 in the axial direction to the length of the powder bin 30 is 15-25%, the width of each static vane 321 is 50-300 mm, and the gap between two adjacent static vanes 321 is 50-400 mm.

At this time, the inner area where the main compartment plate 40 intersects with the conical static vane 321 is a blind plate, and the ventilation hole 401 is not provided, and the outer area is provided with a grate slit, and the structure of the grate slit is the same as that on the main compartment plate 40 in Embodiment 1. The grate seam 402 structure is identical.

After the material enters the powder selection chamber 30 from the grinding chamber 20, it first selects the powder on the conical static blade 321, and then the fine powder passing through the static blade 321 is subjected to the second separation by the dynamic powder separator 310. The final finished product is the product, and the semi-coarse powder that does not pass through the rotor 311 then returns to the grinding bin 20 again to enter the next cycle.

Example 3

Please refer to FIGS. 10-12 . The difference from Embodiment 1 is that the powder selection bin 30 of this embodiment does not have a dynamic powder selection machine 310 , but only a static powder selection machine 320 . The ratio of the length of the powder selection bin 30 to the length of the entire ball mill barrel 10 is 15-40%.

The static vane 321 of the static powder separator 320 is arranged parallel to the axis of the cylinder 10, one end of the static vane 321 close to the grinding chamber 20 is fixed on the main compartment plate 40, and the other end is fixed on the cylinder 10, and the junction They are all connected by welding, and the static vanes 321 occupy the entire powder selection chamber 30 . The width of each static blade 321 is 50-300 mm, and the gap between two adjacent static blades 321 is 100-400 mm. The static blades 321 rotate together with the cylinder 10 to perform the function of coarse screening of materials.

At this time, the inner area where the main compartment plate 40 intersects with the static vane 321 is a blind plate, and the outer area is provided with a grate seam, and the grate seam is a strip-shaped grate seam.

In this embodiment, only the static powder separator 320 is provided, so the entire ball mill can be arranged in a symmetrical structure, so that materials are fed from both ends of the ball mill and unloaded from the middle.

In addition, the static blades 321 of the static powder classifier 320 in this embodiment can also be arranged in a conical arrangement.

The materials enter the corresponding grinding bin 20 through the anti-shock device 50 from the feed ports 101 at both ends, and the ground materials enter the powder selection bin 30 with the air flow; the static blades 321 in the powder selection bin 30 are arranged horizontally, and the sorted The fine material enters the finished product with the airflow and is discharged from the discharge port 102, while the coarse material returns to the grinding bin 20 and enters the next cycle until it becomes a finished product. In this embodiment, a dust collection port 103 is also provided above the discharge port 102 to facilitate dust collection.

The self-selecting ball mill in Example 4 is suitable for materials with a moisture content of less than 2% in raw materials and a particle size of finished products greater than 80 μm. It can be used for the processing of materials such as machine-made sand in the field of building materials, and can also be used for the production of medium and fine ores in the field of mineral processing. .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some or all of the technical features are equivalently replaced, and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. The combined grinding system with the pre-grinding equipment is characterized by comprising roller grinding equipment, a combined type powder concentrator, a first dust collector, a self-separation type ball mill, a second dust collector and a fan, wherein a discharge port of the roller grinding equipment is connected with a feed port of the combined type powder concentrator through a hoisting machine;

the self-sorting ball mill comprises a cylinder body, a feeding port and a discharging port, wherein the cylinder body inclines upwards from the side of the feeding port to the side of the discharging port, and the inclination angle is 2 to 5 degrees; a grinding bin and a powder selecting bin are sequentially arranged in the barrel from a feeding hole to a discharging hole, a plurality of activating rings are arranged in the grinding bin, an inclined lining plate is arranged on the inner wall of the barrel of the powder selecting bin, and a main bin separation plate is arranged between the grinding bin and the powder selecting bin; a static powder concentrator and/or a dynamic powder concentrator are arranged in the powder concentration bin; when only the dynamic powder concentrator is arranged in the powder separation bin, the main partition board is provided with a vent hole positioned in the central area and grate joints positioned on the periphery, the center of the vent hole is coaxial with the mill barrel, and the vent hole is of a net structure; the grate gaps close to the periphery of the vent holes are conical grate gaps, and the diameter of the grate gaps is gradually increased from the grinding bin side to the powder selecting bin side; the grate seam close to the edge area of the main compartment plate is a strip-shaped grate seam;

the dynamic powder concentrator is composed of a rotor, a reaction cone, a transmission shaft and a powder concentrator drive, wherein blades of the rotor are parallel to an inclined lining plate in a powder concentrator, the reaction cone is fixed at the bottom of the rotor, and the diameter of the reaction cone is the same as the outer diameter of the rotor; the rotor is connected with the powder concentrator through a transmission shaft for driving;

the static powder concentrator comprises static blades, one end of each static blade, which is close to the grinding bin, is fixed on the main bin partition plate, and the other end of each static blade is fixed on the barrel; the static blades are arranged in a conical shape or are arranged in parallel with the axis of the cylinder;

when the static blades are arranged in a conical shape, the included angle between the static blades and the axis of the cylinder is 45 to 65 degrees, the diameter of the conical section of the static blades is gradually increased from the grinding bin side to the powder selecting bin side, at the moment, the inner area where the main partition plate is intersected with the conical static blades is a blind plate, and a grid gap is formed in the outer area; when the static blades are arranged in parallel with the axis of the cylinder, the inner area where the main partition plate is intersected with the static blades is a blind plate, and the outer area is provided with a grid seam.

2. The combined grinding system with the pre-grinding equipment is characterized in that a grinding lining plate is arranged on the inner wall of a cylinder body of the grinding bin; the included angle between the inclined lining plate and the axis of the cylinder body is 3-15 degrees.

3. The combined grinding system with the pre-grinding equipment as claimed in claim 1, wherein when a static powder concentrator and a dynamic powder concentrator are provided in the powder concentrator, static blades of the static powder concentrator are arranged in a tapered shape, and the static powder concentrator is located between the main partition plate and the dynamic powder concentrator.

4. The combined grinding system with the pre-grinding equipment is characterized in that an included angle between the feeding hole and the axis of the barrel is larger than 45 degrees, and an external fixed structure is adopted and does not rotate along with the barrel.

5. The combined grinding system with the pre-grinding equipment according to claim 1, wherein a material impact prevention device is arranged at the discharge end of the feed inlet, the material impact prevention device is composed of a tapered telescopic steel sheet, a light spring and a lifting plate, the tapered telescopic steel sheet is positioned at the inner side of the lifting plate, the large diameter end of the tapered telescopic steel sheet is fixed on the lifting plate, and the small diameter end is connected with the lifting plate through the light springs; the conical telescopic steel sheet is formed by sequentially stacking and enclosing a plurality of baffle plates, and each baffle plate corresponds to one light spring; the length of the material raising plate is larger than that of the conical telescopic steel sheet.

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