CN116747958A

CN116747958A - Vertical ball mill for grinding middlings of iron ore

Info

Publication number: CN116747958A
Application number: CN202311044283.5A
Authority: CN
Inventors: 王祥; 王世涛; 王宁一; 张晓荣; 刘彦龙; 魏学斌; 李亮亮
Original assignee: Gansu Tailongsen Mining Industry Co ltd
Current assignee: Gansu Tailongsen Mining Industry Co ltd
Priority date: 2023-08-18
Filing date: 2023-08-18
Publication date: 2023-09-15
Anticipated expiration: 2043-08-18
Also published as: CN116747958B

Abstract

The application provides an upright ball mill for grinding middlings of iron ores, and relates to the technical field of ore dressing of the iron ores. Vertical ball milling for grinding middlings of iron ore comprises a ball milling mechanism and also comprises: the output end of the driving mechanism is in transmission connection with a rotating shaft, one end of the rotating shaft is in rotation connection with the support, and one end of the rotating shaft extending into the ball grinding cylinder is fixedly connected with a spiral blade; the conveying mechanism is sleeved at the bottom of the outer side of the spiral blade, the inner barrel is inserted in the outer barrel in a sliding manner, the inner wall of the inner barrel is in clearance fit with the spiral blade, a supporting rod is fixedly connected to the periphery of the top end of the inner barrel, the supporting rod is clamped to the lifting barrel, the lifting piece can drive the lifting barrel to generate height change on the ball milling barrel, the inner barrel is driven to synchronously lift, the conveying height of the spiral blade is changed, so that the falling height of the steel ball is changed, the grinding efficiency is improved through the lifting height of the steel ball, and the grinding amount per unit time is increased.

Description

Vertical ball mill for grinding middlings of iron ore

Technical Field

The application relates to the field of iron ore dressing, in particular to an upright ball mill for grinding middlings of iron ores.

Background

The metal iron is smelted after iron ore is processed into iron concentrate powder by iron ore mining, and when the iron ore is mined, crushed middling products are required to be ground, and because the ore products in part of the production area are embedded with magnets, in order to enable the ore to be better dissociated in a single mode, an vertical ball mill is used for grinding.

In order to make the grinding granularity uniform and meet the granularity required in the subsequent roughing, I introduce a process of grading mineral powder and returning to regrinding, namely: the coarse grains are returned to the mill for further grinding, the fine grain products are fed into a high-frequency vibrating screen for re-separation, the oversize material is fed into the vertical ball mill for further grinding, and the dry ore concentrate powder under the screen is directly fed into the links of wet coarse grinding, coarse dressing and fine dressing, and the iron ore concentrate powder is obtained after fine dressing.

In the process, the vertical ball mill is key equipment for grinding, and the product structure in the prior art is most advanced and is similar to a vertical ball mill device for metal powder processing in China patent No. 202210950478.5, and the spiral blade is utilized to lift materials and steel balls, so that the impact force on the materials when the steel balls fall is lifted, and the crushing process of the materials is accelerated.

However, the equipment is not matched with I department 'the process of grading and returning mineral powder to regrind':

1. the lifting cylinder body, the lifting sleeve and the helical blade are lifted to lift the descending height of the steel ball, so that the grinding effect on materials is enhanced. However, the structure of the helical blade is fixed, once the helical blade rises, the distance between the bottom end of the helical blade and the bottom in the ball milling barrel is increased, that is, the steel balls at the bottom in the ball milling barrel are spaced from the bottommost helical blade, so that the steel balls cannot be conveyed upwards, and not all the steel balls are subjected to force when the structure is broken, which inevitably leads to poor granularity uniformity of mineral powder, and further influences the grinding effect.

2. After the grinding effect is primarily affected, when coarse materials with more grains and less grains are distributed in the discharge of the mill, the situation that the amount of mineral powder returned to the mill for the second time is increased after the subsequent spiral classifier and the high-frequency vibrating screen are subjected to granularity separation is further caused, the return amount is more, the grinding amount in unit time is reduced, and the grinding efficiency is further greatly reduced. The grinding efficiency influences the yield of the dry ore concentrate powder, is also closely related to the yield of the finally-selected iron ore concentrate powder, and can be considered to determine the productivity.

3. Although the specific gravity of iron ore is larger, the ore powder which is ground in the barrel of the mill has a certain natural classification, fine ore powder is light and can sink, coarse ore powder is heavy and can be on the top of small ore powder, but the natural classification is only approximate and cannot be accurately classified. Direct blanking at the mill bottom can cause coarse material that would otherwise not have to go to the spiral classifier and high frequency vibrating screen to enter the spiral classifier and high frequency vibrating screen. The ball mill is in fact very much required to be classified immediately during the blanking process, so that the material entering the spiral classifier for classification and the high-frequency vibration sieve cannot be returned to the mill in a large amount.

4. The blocking of the mill is generally prevented by controlling the feed amount and monitoring the material level, but is naturally a better choice if the blocking can be avoided from the structural design.

Based on the technical problems, research and development personnel propose a vertical ball mill for grinding middlings of iron ores.

Disclosure of Invention

The application aims to provide a vertical ball mill for grinding ores in iron ores, which aims to solve the problems of more coarse grain return mills and low grinding efficiency when the vertical ball mill is applied to a process of grading and returning ore powder and regrinding in the prior art.

In order to solve the problems, the technical scheme of the application is as follows:

the utility model provides an iron ore middling grinds with vertical ball-milling, contains ball mill mechanism, and ball mill mechanism contains ball mill section of thick bamboo, and the lift section of thick bamboo of slip grafting in ball mill section of thick bamboo supports a plurality of lifters that lift section of thick bamboo goes up and down on ball mill section of thick bamboo to and be located the ejection of compact subassembly of ball mill section of thick bamboo bottom, ball mill section of thick bamboo embeds a plurality of steel balls, still includes:

the device comprises a support fixedly connected to the bottom end of a discharging assembly, a driving mechanism is arranged in the support, the output end of the driving mechanism is in transmission connection with a rotating shaft, one end of the rotating shaft is in rotation connection with the support, the other end of the rotating shaft penetrates through the discharging assembly and extends into a ball grinding cylinder, the rotating shaft is coaxial with the ball grinding cylinder, and a spiral blade is fixedly connected to one end of the rotating shaft extending into the ball grinding cylinder;

the outer side bottom of the spiral blade is sleeved with a material conveying mechanism, the material conveying mechanism comprises an outer cylinder arranged at the inner bottom of the ball mill cylinder, the axial length of the outer cylinder is smaller than that of the spiral blade, an inner cylinder is slidably inserted in the outer cylinder, the inner wall of the inner cylinder is in clearance fit with the spiral blade, a supporting rod is fixedly connected to the peripheral side of the top end of the inner cylinder and is clamped with a lifting cylinder, a supporting leg is fixedly connected to the bottom end of the outer cylinder, and one end, far away from the outer cylinder, of the supporting leg is arranged at the inner bottom of the ball mill cylinder;

one end of the lifting cylinder, which is far away from the ball grinding cylinder, is provided with a feeding mechanism.

In addition, the application has the following additional technical characteristics:

further, the bottom circumference side of ball-milling section of thick bamboo is provided with outer eaves, and the lateral wall of ball-milling section of thick bamboo is interior axial to be provided with vertical spout, and the inner wall downside of ball-milling section of thick bamboo is provided with annular horizontal spout.

Further, the lifting cylinder comprises a vertical part and an inclined part, the vertical part is in limiting sliding insertion connection with the vertical chute, the inclined part is fixedly connected to the top end of the vertical part, a flange is arranged on the outer side of the joint of the inclined part and the vertical part, and two ends of the lifting part are fixedly connected to the outer eave and the flange respectively.

Further, the inner side of the vertical part is fixedly connected with an annular lining, the top end of the lining is in an arc shape, and a supporting rod is clamped on the lining.

Further, the outer side of the top end of the inclined part is fixedly connected with an annular thread seat, and the thread seat is in threaded fit with the feeding mechanism.

Further, the discharging component comprises a conical bottom fixedly connected to the support, a shaft sleeve rotationally connected with the conical bottom, a scraping plate fixedly connected with the shaft sleeve, and a surrounding baffle fixedly connected between the conical bottom and the ball mill barrel;

the shaft sleeve is rotationally sleeved on the rotating shaft;

the scraping plates are arranged in an array along the circumference of the shaft sleeve, the lower end surfaces of the scraping plates are matched with the upper end surfaces of the conical bottoms, and the scraping plates are in clearance fit with the surrounding baffles;

a discharge hole is arranged on the side wall of the enclosure.

Further, a ball milling chassis is arranged at the inner bottom of the ball milling cylinder, the ball milling chassis is arranged in a downward concave conical shape, and a plurality of holes are uniformly formed in the ball milling chassis;

the ball milling chassis is connected with the shaft sleeve through a key;

the periphery of the ball milling chassis is fixedly connected with a first limiting ring, and the first limiting ring is in sliding fit with the transverse chute;

an annular limiting groove is formed in the upper end face of the ball milling chassis.

Further, the driving mechanism comprises a motor fixedly connected in the support and a bevel gear set connected with the output end of the motor in a transmission way;

the bevel gear group comprises a drive bevel gear connected with the output end of the motor in a key way, a lower bevel gear connected with the rotary shaft in a key way, the lower bevel gear is meshed with the drive bevel gear, and an upper bevel gear which is arranged symmetrically up and down with the lower bevel gear is meshed with the drive bevel gear, and the upper bevel gear is connected with the shaft sleeve in a key way.

Further, an inner chute is arranged on the inner wall of the outer cylinder in a circumferential array;

the inner sliding strip is arranged on the outer wall of the inner cylinder in a circumferential array manner, and the inner sliding strip is in sliding fit with the inner sliding groove.

Further, the supporting legs are arranged along the axial circumference array of the outer cylinder;

the bottom end of the supporting leg is fixedly connected with a second limiting ring, and the second limiting ring is in sliding fit with the annular limiting groove;

the upper end face of the second limiting ring is matched with the upper end face of the ball milling chassis.

Further, through grooves are formed in the side wall of the outer cylinder in an axial circumferential array mode, sliding blocks are arranged in the circumferential array mode at the bottom end of the outer wall of the inner cylinder, and the sliding blocks correspond to the through grooves one by one and are in sliding fit with the through grooves.

Furthermore, the two ends of the through groove do not penetrate through the outer cylinder, and the through groove and the inner sliding groove are arranged in a staggered mode.

Further, the upper end face of the sliding block is arranged in an inclined mode from inside to outside along the radial direction of the inner cylinder, and the inner side of the upper end face of the sliding block is higher than the outer side.

Further, the feeding mechanism comprises a feeding nozzle communicated with the inclined part and a bulk cargo tray connected to the top end of the rotating shaft in a key manner.

Further, the feeding nozzle is in a conical shape opposite to the inclined part.

Further, a threaded ring is fixedly connected to the periphery of the bottom end of the feeding nozzle, and the threaded ring is in threaded fit with the threaded seat.

Further, the outer diameter of the bulk cargo disc is smaller than the inner diameter of the communicating part of the feeding nozzle and the inclined part.

Further, the upper end face of the bulk cargo disc is provided with convex strips along the axial circumference array of the bulk cargo disc.

The beneficial effects of the application are as follows:

1. according to the application, the lifting cylinder can be driven to generate height change on the ball milling cylinder by telescopic change of the lifting piece, the inner cylinder is driven to synchronously lift on the outer cylinder by the height change of the lifting cylinder, then the transportation height of the spiral blade extending out of the top end of the outer cylinder is changed, but the distance between the bottom of the spiral blade and the ball milling chassis is not changed, so that all steel balls in the ball milling chassis can be rolled up by the spiral blade, the falling height of all steel balls in the ball milling cylinder is ensured to be improved, the grinding effect on dry mineral powder (hereinafter, dry mineral powder is collectively called as materials) is further improved, the grinding granularity is more uniform, the number of coarse grains is reduced, the coarse grains returned to the mill are naturally reduced, and the grinding efficiency is greatly improved.

2. The inner cylinder is utilized to slide on the outer cylinder (namely, the inner cylinder follows the lifting cylinder to synchronously lift), so that the through groove originally shielded by the inner cylinder is exposed on the outer cylinder, and then in the process that the spiral blade completely conveys the steel ball and the material upwards, the finer material leaks from the through groove on the side wall of the outer cylinder, so that most of the spiral blade conveys the steel ball, and a small part of the spiral blade is coarse-grained material, so that the conveying efficiency is improved.

Meanwhile, when fine materials leak out from the side wall of the outer cylinder, and coarse materials are partially arranged on the ball milling chassis, and are lifted, rubbed and extruded together with the steel balls on the spiral blades, finally thrown out from the top end of the inner cylinder and fall into the ball milling cylinder, and the coarse materials are continuously crushed.

In this process, the transport of coarse material provides sufficient space for the fine material to settle downwards (principle similar to that of a sieve), while the falling steel balls can finely grind coarse particles on top of the fine material. Along with the continuous condition, the fine materials pass through holes of the grinding chassis in cooperation with the rotation of the ball milling chassis, are scraped out through the discharging component, finally enter the spiral classifier for classification and then go to the high-frequency vibrating screen, and the preliminary classification is realized in the mill. Meanwhile, coarse-grain materials can be classified by rotation of the ball milling chassis, coarser materials are on the upper layer, the materials to be ground can be directly crushed when the steel balls fall down, the grinding efficiency is improved, and the grinding amount per unit time is increased.

3. The size of the inclined included angle of the inclined part is utilized to match with the lifting action of the lifting cylinder on the ball mill cylinder and the position change of the bulk cargo disc in the lifting cylinder, so that the blanking speed of the whole equipment is changed, the blanking speed and the descending height of the steel ball are matched, the blocking can be prevented from structural design, and the grinding efficiency of the whole equipment is improved.

Additional aspects and advantages of the application will be set forth in part in the description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the overall structure of a vertical ball mill for grinding middlings of iron ore according to an embodiment of the present application;

FIG. 2 is a schematic view showing an internal structure of a vertical ball mill for grinding middlings of iron ore according to an embodiment of the present application;

FIG. 3 is a cross-sectional view of the construction of a lift cylinder and ball mill cylinder according to an embodiment of the application;

FIG. 4 is an exploded view showing a partial structure of a vertical ball mill for grinding middlings of iron ore according to an embodiment of the present application;

FIG. 5 is an exploded view of the structure of the outer and inner drums according to an embodiment of the present application;

FIG. 6 is an exploded view of another perspective structure of the outer and inner drums according to an embodiment of the present application;

FIG. 7 is an exploded view of a partial structure of the discharge assembly, the ball mill pan, and the outer bowl according to an embodiment of the present application;

FIG. 8 is a side view showing an internal structure of a vertical ball mill for grinding middlings of iron ore according to an embodiment of the application;

fig. 9 is a schematic diagram of the angles between the feeding nozzle and the inclined part and the horizontal axis respectively according to the embodiment of the application.

Icon: 1. a ball milling mechanism; 11. a ball mill barrel; 111. an outer eave; 112. a vertical chute; 113. a transverse chute; 12. a lifting cylinder; 121. a vertical portion; 122. an inclined portion; 123. a flange; 124. a lining; 125. a screw seat; 13. a lifting member; 14. a discharge assembly; 141. a conical bottom; 142. a shaft sleeve; 143. a scraper; 144. a surrounding baffle; 15. a support; 16. ball milling chassis; 161. an annular limit groove; 162. a first stop collar; 2. a driving mechanism; 21. a motor; 22. a bevel gear set; 221. a drive bevel gear; 222. a lower bevel gear; 223. an upper bevel gear; 23. a rotating shaft; 24. a helical blade; 3. a material conveying mechanism; 31. an outer cylinder; 311. an inner chute; 312. a through groove; 32. an inner cylinder; 321. an inner slide; 322. a slide block; 33. a support rod; 34. a support leg; 341. a second limiting ring; 4. a feeding mechanism; 41. a feeding nozzle; 411. a threaded ring; 42. a bulk tray; 421. a convex strip.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, based on the embodiments of the application, which a person of ordinary skill in the art would achieve without inventive faculty, are within the scope of the application.

As shown in fig. 1 to 9, the vertical ball mill for grinding the middlings of the iron ores comprises a ball milling mechanism 1, a driving mechanism 2, a material conveying mechanism 3 and a material feeding mechanism 4.

The specific structure and connection of each mechanism are as follows:

1. a ball milling mechanism 1;

as shown in fig. 1 to 4, the ball milling mechanism 1 includes: the ball mill comprises a ball mill barrel 11, a lifting barrel 12 which is inserted in the ball mill barrel 11 in a sliding manner, a plurality of lifting pieces 13 which support the lifting barrel 12 to lift on the ball mill barrel 11, a discharging assembly 14 positioned at the bottom end of the ball mill barrel 11, a support 15 fixedly connected to the bottom end of the discharging assembly 14 and a ball mill chassis 16 arranged at the inner bottom of the ball mill barrel 11.

(1) A ball mill 11;

the ball mill 11 is internally provided with a plurality of steel balls, and the concrete steel balls are put in according to actual needs.

As shown in fig. 3, an outer eave 111 is provided on the bottom end circumference side of the ball mill 11, a vertical chute 112 is provided on the inner wall axial direction of the ball mill 11, and an annular transverse chute 113 is provided on the inner wall bottom side of the ball mill 11.

(2) A lifting cylinder 12;

as shown in fig. 2, the lift cylinder 12 includes: a vertical portion 121 and an inclined portion 122.

The vertical part 121 is inserted into the vertical chute 112 in a limiting sliding manner; the inclined part 122 is fixedly connected to the top end of the vertical part 121; a flange 123 is arranged outside the joint of the inclined part 122 and the vertical part 121

As shown in fig. 2 and 3, an annular liner 124 is fixedly connected to the inner side of the vertical portion 121, and the top end of the liner 124 is arc-shaped, so that the arc-shaped liner can avoid material accumulation, and further avoid affecting the grinding effect and efficiency of the materials in the whole device.

As shown in fig. 3 and 4, an annular screw seat 125 is fixedly connected to the outer side of the tip of the inclined portion 122.

(3) A lifter 13;

the lifting member 13 is a conventional device having a lifting function, and a hydraulic cylinder is preferable in the embodiment of the present application. The two ends of the lifting member 13 are respectively fixedly connected to the outer eave 111 and the flange 123.

(4) A discharge assembly 14;

as shown in fig. 2 and 7, the outfeed assembly 14 comprises: the ball mill comprises a conical bottom 141 fixedly connected to a support 15, a shaft sleeve 142 rotationally connected with the conical bottom 141, a scraping plate 143 fixedly connected with the shaft sleeve 142, and a surrounding baffle 144 fixedly connected between the conical bottom 141 and the ball mill 11.

Wherein the tapered bottom 141 is inclined downward from inside to outside, forming an upwardly convex taper,

the shaft sleeve 142 is rotatably sleeved on the rotating shaft 23, and the shaft sleeve and the rotating shaft can rotate reversely without interference.

The scraping plates 143 are arranged in a circumferential array along the shaft sleeve 142, the lower end surfaces of the scraping plates 143 are matched with the upper end surfaces of the conical bottoms 141, and the side walls of the scraping plates 143 are matched with the gaps of the enclosing baffles 144. The above arrangement facilitates scraping of the material falling on the upper end surface of the tapered bottom 141 by the driving scraper 143 when the shaft sleeve 142 rotates.

A discharge port is provided in the sidewall of the enclosure 144, whereby when the scraper 143 scrapes the material on the conical bottom 141, the material will be discharged from the discharge port by centrifugal force.

(5) A support 15;

as shown in fig. 2, the support 15 is sized larger than the conical bottom 141 and is anchored in use to the floor of the plant.

(6) A ball milling chassis 16;

as shown in fig. 7 and 8, the ball mill base 16 is keyed to the top of the sleeve 142 to facilitate the rotation of the two in unison.

The ball milling chassis 16 is inclined downwards from outside to inside to form a downwards concave cone shape, so that when the ball milling chassis 16 rotates, materials and steel balls on the ball milling chassis are converged towards the axis of the ball milling chassis, namely, the ball milling chassis is gradually closed towards the spiral blades 24, and the spiral blades 24 are ready for conveying the materials and the steel balls. The ball milling chassis 16 is provided with a plurality of holes at uniform intervals, so that the ground materials with the fineness reaching the standard pass through the holes and fall on the conical bottom 141, and normal discharging action is completed.

The first limiting ring 162 is fixedly connected to the periphery of the ball milling chassis 16, the first limiting ring 162 is in sliding fit with the transverse sliding groove 113, and then when the shaft sleeve 142 rotates, the ball milling chassis 16 rotates along with the ball milling barrel 11 in the circumferential direction and is axially fixed, so that the steel balls are guaranteed to crush materials on the ball milling chassis 16 normally.

An annular limit groove 161 is arranged on the upper end surface of the ball milling chassis 16. The annular limiting groove 161 and the rotating shaft 23 are coaxially arranged with the ball mill base 16.

A driving mechanism 2;

as shown in fig. 2, 4 and 7, the driving mechanism 2 includes: the motor 21 is fixedly connected in the support 15, the bevel gear set 22 is connected to the output end of the motor 21 in a transmission way, the rotating shaft 23 and the helical blade 24 is fixedly connected to one end of the rotating shaft 23. The motor 21 may drive the bevel gear set 22 to rotate.

(1) Bevel gear set 22;

as shown in fig. 4 and 7, the bevel gear set 22 includes: a drive bevel gear 221 connected with the output end of the motor 21 in a key way, a lower bevel gear 222 connected with the rotating shaft 23 in a key way, and an upper bevel gear 223 arranged symmetrically up and down with the lower bevel gear 222.

Wherein: the lower bevel gear 222 meshes with the drive bevel gear 221; the upper bevel gear 223 is engaged with the drive bevel gear 221, and the upper bevel gear 223 is keyed to the sleeve 142. The bottommost portion of the sleeve 142 is located between the lower bevel gear 222 and the upper bevel gear 223 (fig. 7), and does not affect the transmission of the rotation shaft 23 and the lower bevel gear 222.

(2) A rotation shaft 23;

as shown in fig. 2, one end of the rotating shaft 23 is rotatably connected to the support 15, the other end of the rotating shaft 23 penetrates through the discharging component 14 and the ball milling chassis 16 to extend into the ball milling barrel 11, and the rotating shaft 23 and the ball milling barrel 11 are coaxial.

(3) A helical blade 24;

as shown in fig. 2 and 4, a spiral blade 24 is fixedly connected to one end of the rotating shaft 23 extending into the ball mill 11,

from the above structure and connection, the motor 21 can perform two actions:

one is that the motor 21 drives the rotating shaft 23 and the helical blades 24 thereon to synchronously rotate through the transmission between the driving bevel gear 221 and the lower bevel gear 222, so as to finish the upward conveying action of the steel balls, and finally the steel balls fall from a certain height to break the materials positioned at the bottom of the ball grinding cylinder 11.

And secondly, the motor 21 drives the shaft sleeve 142, the scraping plate 143 and the ball milling chassis 16 to synchronously rotate through the transmission between the driving bevel gear 221 and the upper bevel gear 223.

A material conveying mechanism 3;

as shown in fig. 4-7, the feeding mechanism 3 is sleeved at the outer bottom of the spiral blade 24. The feed mechanism 3 comprises: the ball grinder comprises an outer cylinder 31 arranged at the inner bottom of the ball grinder 11, an inner cylinder 32 which is inserted in the outer cylinder 31 in a sliding manner, a supporting rod 33 and supporting legs 34 which are arranged in an array along the axial circumference of the bottom of the outer cylinder 31.

(1) An outer cylinder 31 and an inner cylinder 32;

as shown in fig. 2, the outer barrel 31 is adapted to the inner barrel 32 and both have an axial length less than the axial length of the helical blades 24.

The inner wall of the inner cylinder 32 and the helical blades 24 are clearance fit such that the helical blades 24 complete the conveying action inside the inner cylinder 32 and the outer cylinder 31.

As shown in fig. 5 to 6, the outer cylinder 31 and the inner cylinder 32 are axially slidably connected in the ball mill 11, and the specific implementation manner is as follows: the inner wall of the outer cylinder 31 is provided with an inner sliding groove 311 in a circumferential array, the outer wall of the inner cylinder 32 is provided with an inner sliding bar 321 in a circumferential array, and the inner sliding bar 321 is in sliding fit with the inner sliding groove 311.

Through grooves 312 are formed in the side wall of the outer cylinder 31 in an axial circumferential array, sliding blocks 322 are arranged in the bottom end of the outer wall of the inner cylinder 32 in a circumferential array, and the sliding blocks 322 are in one-to-one correspondence with the through grooves 312 and are in sliding fit.

Wherein: the two ends of the through groove 312 do not penetrate through the outer cylinder 31, so that the displacement travel of the inner cylinder 32 is limited, and the through groove 312 and the inner slide groove 311 are arranged in a staggered manner. The upper end surface of the slider 322 is disposed in an inclined manner from inside to outside in the radial direction of the inner cylinder 32, wherein the inner side of the upper end surface of the slider 322 is higher than the outer side (not shown in the drawings).

The structure and the connection relation can be known: when the lifting piece 13 stretches out and draws back, the lifting cylinder 12 is driven to lift on the ball milling cylinder 11, and then the inner cylinder 32 is driven to synchronously lift on the outer cylinder 31 through the lifting action of the lifting cylinder 12, namely, the inner cylinder slides axially, so that the conveying length of the helical blade 24 is changed, namely, the falling height of the steel ball is changed.

(2) A strut 33;

as shown in fig. 4, one end of the supporting rod 33 is fixedly connected to the top end four walls of the inner cylinder 32, and the other end of the supporting rod 33 is clamped on the inner liner 124 of the lifting cylinder 12. When the lifting cylinder 12 lifts, the inner cylinder 32 is driven to move up and down synchronously.

(4) Legs 34;

as shown in fig. 7, the top of the legs 34 are arranged in an axial circumferential array along the bottom of the outer barrel 31, with a spacing between the legs 34 sufficient for the steel balls to pass through. The bottom end of the supporting leg 34 is fixedly connected with a second limiting ring 341, and the second limiting ring 341 is in sliding fit with the annular limiting groove 161.

The top surface of the second limiting ring 341 installed in the annular limiting groove 161 is flush with the top surface of the ball milling chassis 16, so that the situation that the upper end surface of the second limiting ring 341 protrudes or is recessed from the upper end surface of the ball milling chassis 16 is avoided, and the material and the steel balls are prevented from being blocked when moving towards the directions of the helical blades 24 and the rotating shaft 23.

The outer cylinder 31 is in sliding relation with the annular limiting groove 161 through the second limiting ring 341, so that the outer cylinder 31 can be undisturbed and fixed when the ball milling chassis 16 rotates. This structure is to realize: when the ball milling base plate 16 rotates, the outer cylinder 31 and the inner cylinder 32 do not rotate along with the ball milling base plate, but are relatively fixed in the circumferential direction of the ball milling cylinder 11, so that the ball milling base plate can be matched with the lifting cylinder 12.

The specific implementation mode of the structure is as follows:

the motor 21 drives the driving bevel gear 221 to rotate, and then the upper bevel gear 223 meshed with the driving bevel gear 221 drives the ball milling chassis 16 and the scraping plate 143 to rotate through the shaft sleeve 142, and the lower bevel gear 222 meshed with the driving bevel gear 222 drives the helical blade 24 to rotate through the rotating shaft 23. The above process will drive the ball mill chassis 16 and the scraping plate 143 to rotate synchronously in the same direction, and the ball mill chassis 16 and the helical blades 24 rotate synchronously in the opposite direction.

When the ball mill chassis 16 rotates, the outer cylinder 31 and the inner cylinder 32 are in a circumferentially fixed and axially slidable state. In particular by the following structure.

First,: the rod 33 fixes the inner tube 32, and thus, the axial sliding relationship between the outer tube 31 and the inner tube 32 in the ball mill 11 is realized, and the outer tube 31 and the inner tube 32 are fixed together in the circumferential direction by the rod 33, because of the axial sliding relationship between the inner slide 321 and the inner slide 311, and the one-to-one correspondence between the slide 322 and the through groove 312.

Secondly: since the outer tube 31 and the inner tube 32 are in a circumferentially fixed connection, the second stopper ring 341 provided at the bottom of the leg 34 of the outer tube 31 is fixed by the circumferential fixation of the outer tube 31.

Finally: because the annular limiting groove 161 is in sliding fit with the second limiting ring 341, the annular limiting groove 161 rotates along with the rotation of the ball mill chassis 16, so that the rotation of the annular limiting groove 161 is performed under the limitation of the second limiting ring 341.

A feeding mechanism 4;

as shown in fig. 2, 4 and 8, the feeding mechanism 4 includes: the feeding nozzle 41 communicated with the inclined part 122 and the bulk cargo tray 42 connected to the top end of the rotating shaft 23 in a key way, and the rotation of the rotating shaft 23 drives the bulk cargo tray 42 to synchronously rotate.

(1) A charging nozzle 41;

as shown in fig. 4, the charging nozzle 41 is tapered, and the taper is disposed opposite to the inclined portion 122.

The screw thread ring 411 is fixedly connected to the circumference of the bottom end of the feeding nozzle 41, and the screw thread ring 411 is in screw thread fit with the screw thread seat 125, so that the feeding nozzle 41 and the lifting cylinder 12 can be conveniently installed or detached.

As shown in fig. 9, the included angle between the sidewall of the charging nozzle 41 and the vertical axis C is a, and the included angle between the sidewall of the inclined portion 122 and the vertical axis C is b. Wherein a is more than or equal to 45 degrees and less than or equal to 60 degrees so as to be convenient for connecting a feeding belt; b is greater than or equal to 5 degrees and less than or equal to 30 degrees, so that in the rising process of the lifting cylinder 12, the horizontal distance between the bulk cargo tray 42 and the inclined part 122 after rising can not be suddenly increased due to overlarge angle, and a certain control effect is also achieved on the falling speed of the material passing through the distance.

(2) A bulk tray 42;

the bulk material tray 42 is arranged at the top of the rotating shaft 23, and in the initial state (the lifting cylinder 12 is positioned at the bottommost end of the ball mill 11), the bulk material tray 42 is positioned at the bottom side of the opening at the bottom of the feeding nozzle 41.

The outer diameter of the bulk material tray 42 is smaller than the inner diameter of the connection part between the material inlet nozzle 41 and the inclined part 122, and the upper end surface of the bulk material tray 42 is provided with convex strips 421 along the circumferential array of the bulk material tray 42. When the bulk material tray 42 rotates, the materials on the bulk material tray are thrown out to the periphery of the bulk material tray 42 after being blocked by the convex strips 421 for a short time, so that the materials are uniformly scattered in the ball mill 11 during feeding.

The working process of the application is as follows:

1. starting feeding;

the material (middling product) to be processed is fed into the ball mill 11 through the feeding mechanism 4, and the motor 21 is started again.

The material enters from the feeding nozzle 41, the rotating shaft 23 drives the bulk material tray 42 to synchronously rotate, and the material falling on the bulk material tray 42 is thrown out towards the periphery of the bulk material tray 42 by the raised strips 421, so that the material is uniformly scattered into the ball mill barrel 11 during feeding.

An abrasive;

firstly, the steel balls on the ball mill chassis 16 gather towards the axle center and finally enter the inner barrel 32, when the helical blades 24 start to rotate, the steel balls are conveyed to the top of the ball mill barrel 11 by the helical blades 24 (the conveying height is limited by the top end of the inner barrel 32), and then are thrown out from the top end of the inner barrel 32, fall back to the ball mill chassis 16 under the action of self gravity, and break up the required ground materials on the ball mill chassis 16.

The size of the crushed materials is small, the materials can slide down from the periphery to the center of the ball milling chassis 16 due to the gradient and rotation of the ball milling chassis 16, and the large-grain materials are on the upper side and the small-grain materials are on the lower side.

The small-particle materials with fineness reaching the standard fall onto the conical bottom 141 at the bottom end through the through hole on the ball milling chassis 16, the shaft sleeve 142 drives the scraping plate 143 to scrape the ground materials on the conical bottom 141 under the action of the motor 21, and the materials are discharged from the discharge hole on the enclosing block 144 under the action of centrifugal force, so that normal discharging actions are completed.

Wherein, the large-grain materials with the fineness not reaching the standard are partially left on the ball milling chassis 16, partially gathered with the steel balls gradually towards the center, pass through the plurality of supporting legs 34, enter the inner barrel 32, and are thrown out again by the helical blades 24. The falling area of the steel ball after being thrown is between the outer barrel 31 and the ball milling barrel 11, and small particles with the fineness up to the standard in the area are fallen, only the materials with the fineness up to the standard are left, and the materials are naturally crushed according to the application, so that no repeated crushing exists, and the natural grinding efficiency can be greatly improved.

Grinding amount adjustment and blocking treatment;

in similar vertical ball milling work in the prior art, on one hand, the productivity is limited, and the unit grinding amount is difficult to be improved; on the other hand, when the feeding amount is required to be strictly controlled, a plurality of material level meters are also arranged in the ball milling cylinder 11, the material level in the ball milling cylinder 11 is strictly monitored, the feeding is required to be stopped immediately when the material level is too high, and the feeding is started after the material level in the ball milling cylinder 11 accords with a set value after the material level is discharged after the material is completely milled. This clearly has a major effect on the unit grind size.

The application can adjust the equipment according to the productivity requirement, and can directly adjust according to the following operation without stopping feeding when the grinding amount in unit time needs to be increased or the materials in the ball mill 11 exceed the material level setting and are slightly accumulated.

(1) Lifting the descending height of the steel ball;

on the basis of the step 2, the lifting cylinder 12 is driven to gradually rise on the ball milling cylinder 11 by the extension of the telescopic end of the lifting member 13, and the lifting cylinder 12 synchronously drives the inner cylinder 32 to synchronously rise, so that the conveying length of the helical blades 24 in the inner cylinder 32 and the outer cylinder 31 is gradually increased, the falling height of the steel ball is gradually increased, the impact force on the bottom material after the steel ball falls is increased by the increase of the falling height, the increase of the grinding speed of the material is realized, the discharge amount is increased, the blocking can be naturally eliminated, the grinding amount of unit time is improved, and the integral grinding efficiency of the equipment can be greatly improved.

(2) The blanking speed is improved;

the height of the lifting cylinder 12 on the ball mill 11 changes, and the relative positional relationship between the bulk material tray 42 and the inclined portion 122 is also changed: the lifting cylinder 12 gradually rises, the vertical part 121 and the inclined part 122 rise, the horizontal distance between the side wall of the bulk material tray 42 and the inclined part 122 becomes larger when the bulk material tray 42 is not moved, and the material falling from the distance does not pass through the bulk material tray 42, so that the overall blanking speed is increased.

The feeding and discharging speed is used for matching the descending height of the steel balls, and the feeding speed and the discharging speed are in direct proportion, so that the grinding and discharging efficiency of the materials in the ball mill 11 can be ensured, namely, the ore grinding amount is increased, and the blocking can be eliminated.

A plurality of high level gauges are further arranged on the basis of the original level gauges, and the highest level in the ball grinding cylinder 11 needs to be controlled after the lifting cylinder 12 is lifted, and the part is not shown in the figure and is not described in detail because the part is not the core of the application.

(3) Conveying materials;

in the above process, when the inner cylinder 32 gradually rises on the outer cylinder 31, the through groove 312 on the outer cylinder 31 gradually leaks out, and at the same time, the slider 322 gradually rises on the through groove 312.

In this process, the through grooves 312 on the outer cylinder 31 are gradually exposed along with the rising of the inner cylinder 32, so that when the helical blades 24 positioned therein convey materials upwards, fine mineral powder materials slide out from the exposed through grooves 312, fall on the ball mill chassis 16 along with materials and steel balls outside the outer cylinder 31, and are displaced towards the direction of the rotating shaft 23.

At this time, the materials with the fineness reaching the standard, whether the steel balls fall down and smash or leak from the through grooves 312, finally naturally pass through the through holes on the ball milling chassis 16 to fall to the conical bottom 141 in the process of converging towards the rotating shaft 23, and finally are discharged from the discharge hole.

At this time, the material with the fineness not reaching the standard is partially left on the ball mill chassis 16, and part of the material is continuously conveyed by the spiral blade 24, finally is thrown off from the top end of the inner cylinder 32 (higher than the height in the abrasive link), and is continuously crushed by the steel balls.

The above processes are repeated continuously to form the whole process of grinding mineral powder by vertical ball milling.

(4) It is apparent from this that in the above procedure:

1. the repeated crushing action of the steel balls on the materials with fineness up to the standard can be avoided, and only the materials with fineness not up to the standard can be continuously and effectively crushed, so that the grinding efficiency of the whole vertical ball mill is improved.

2. Since the through groove 312 penetrates through the outer cylinder 31, the overlapped part of the through groove 312 and the inner cylinder 32 is filled with the material, and the sliding block 322 can remove the material when the sliding block 322 synchronously ascends along with the inner cylinder 32, so that the material still remains on the outer cylinder 31 during final discharging is avoided.

3. Preventing blocking;

the continuous actions of sustainable feeding, grinding and discharging are formed in the whole equipment, the feeding speed is controllable, blocking can be eliminated, the grinding amount in unit time can be increased or decreased, and the grinding efficiency and the using convenience of the whole equipment are obviously improved.

It should be noted that, specific model specifications of the motor 21, the drive bevel gear 221, the lower bevel gear 222, the upper bevel gear 223 and the helical blade 24 need to be determined by selecting a model according to actual specifications of the device, and a specific model selection calculation method adopts the prior art, so that detailed descriptions thereof are omitted.

The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. The utility model provides an iron ore middling grinds with vertical ball-milling, contains ball-milling mechanism (1), ball-milling mechanism (1) contain ball mill section of thick bamboo (11), slide peg graft in lift section of thick bamboo (12) in ball mill section of thick bamboo (11), support lift section of thick bamboo (12) a plurality of lifters (13) that go up and down on ball mill section of thick bamboo (11), and be located discharge module (14) of ball mill section of thick bamboo (11) bottom, ball mill section of thick bamboo (11) embeds a plurality of steel balls, its characterized in that still includes:

the device comprises a support (15) fixedly connected to the bottom end of a discharging assembly (14), a driving mechanism (2) is arranged in the support (15), a rotating shaft (23) is connected to the output end of the driving mechanism (2) in a transmission manner, one end of the rotating shaft (23) is rotatably connected to the support (15), the other end of the rotating shaft (23) penetrates through the discharging assembly (14) and extends into a ball milling barrel (11), the rotating shaft (23) and the ball milling barrel (11) are coaxial, and a spiral blade (24) is fixedly connected to one end of the rotating shaft (23) extending into the ball milling barrel (11);

the outer side bottom of the spiral blade (24) is sleeved with a material conveying mechanism (3), the material conveying mechanism (3) comprises an outer cylinder (31) arranged at the inner bottom of the ball milling cylinder (11), the axial length of the outer cylinder (31) is smaller than that of the spiral blade (24), an inner cylinder (32) is inserted in the outer cylinder (31) in a sliding manner, the inner wall of the inner cylinder (32) is in clearance fit with the spiral blade (24), a supporting rod (33) is fixedly connected to the periphery of the top end of the inner cylinder (32), the supporting rod (33) is clamped to the lifting cylinder (12), a supporting leg (34) is fixedly connected to the bottom end of the outer cylinder (31), and one end, far away from the outer cylinder (31), of the supporting leg (34) is arranged at the inner bottom of the ball milling cylinder (11);

one end of the lifting cylinder (12) far away from the ball grinding cylinder (11) is provided with a feeding mechanism (4).

2. The vertical ball mill for grinding middlings of iron ore according to claim 1, wherein: the ball mill is characterized in that an outer eave (111) is arranged on the periphery of the bottom end of the ball mill barrel (11), a vertical chute (112) is axially arranged on the inner wall of the ball mill barrel (11), and an annular transverse chute (113) is arranged on the bottom side of the inner wall of the ball mill barrel (11).

3. The vertical ball mill for grinding middlings of iron ore according to claim 2, wherein: the lifting cylinder (12) comprises a vertical part (121) and an inclined part (122), the vertical part (121) is in limit sliding insertion connection with the vertical chute (112), the inclined part (122) is fixedly connected to the top end of the vertical part (121), a flange (123) is arranged on the outer side of the joint of the inclined part (122) and the vertical part (121), and two ends of the lifting piece (13) are fixedly connected to the outer eave (111) and the flange (123) respectively;

the outer side of the top end of the inclined part (122) is fixedly connected with an annular threaded seat (125), and the threaded seat (125) is in threaded fit with the feeding mechanism (4).

4. A vertical ball mill for grinding middlings of iron ore according to claim 3, wherein: an annular lining (124) is fixedly connected to the inner side of the vertical part (121), the top end of the lining (124) is in an arc shape, and the supporting rods (33) are clamped on the lining (124).

5. A vertical ball mill for grinding middlings of iron ore according to claim 3 or 4, wherein: the feeding mechanism (4) comprises: a feeding nozzle (41) communicated with the inclined part (122), and a bulk tray (42) connected with the top end of the rotating shaft (23) in a key way;

the feeding nozzle (41) is conical, and the conical arrangement is opposite to the inclined part (122); a threaded ring (411) is fixedly connected to the periphery of the bottom end of the feeding nozzle (41), and the threaded ring (411) is in threaded fit with the threaded seat (125);

the outer diameter of the bulk material tray (42) is smaller than the inner diameter of the communicating part of the feeding nozzle (41) and the inclined part (122), and convex strips (421) are arranged on the upper end surface of the bulk material tray (42) along the circumferential array of the bulk material tray (42).

6. The vertical ball mill for grinding middlings of iron ore according to claim 2, wherein: the discharging assembly (14) comprises a conical bottom (141) fixedly connected to the support (15), a shaft sleeve (142) rotationally connected with the conical bottom (141), a scraping plate (143) fixedly connected with the shaft sleeve (142), and a surrounding baffle (144) fixedly connected between the conical bottom (141) and the ball milling barrel (11);

the shaft sleeve (142) is rotationally sleeved on the rotating shaft (23);

the scraping plates (143) are arranged in a circumferential array along the shaft sleeve (142), the lower end surfaces of the scraping plates (143) are matched with the upper end surfaces of the conical bottoms (141), and the scraping plates (143) are in clearance fit with the enclosing baffles (144);

and a discharge hole is formed in the side wall of the enclosure (144).

7. The vertical ball mill for grinding middlings of iron ore according to claim 6, wherein: the inner bottom of the ball milling barrel (11) is provided with a ball milling chassis (16), the ball milling chassis (16) is in a downward concave conical shape, and a plurality of holes are uniformly formed in the ball milling chassis (16);

the ball milling chassis (16) is connected with the shaft sleeve (142) in a key way;

a first limiting ring (162) is fixedly connected to the periphery of the ball milling chassis (16), and the first limiting ring (162) is in sliding fit with the transverse chute (113);

an annular limiting groove (161) is formed in the upper end face of the ball milling chassis (16).

8. The vertical ball mill for grinding middlings of iron ore according to claim 6, wherein: the driving mechanism (2) comprises a motor (21) fixedly connected in the support (15) and a bevel gear set (22) connected with the output end of the motor (21) in a transmission way;

the bevel gear group (22) comprises a drive bevel gear (221) connected with the output end of the motor (21) in a key way, a lower bevel gear (222) connected with the rotating shaft (23) in a key way, the lower bevel gear (222) is meshed with the drive bevel gear (221), an upper bevel gear (223) symmetrically arranged on the lower bevel gear (222) in an up-down mode, the upper bevel gear (223) is meshed with the drive bevel gear (221), and the upper bevel gear (223) is connected with the shaft sleeve (142) in a key way.

9. The vertical ball mill for grinding middlings of iron ore according to claim 1, wherein: an inner chute (311) is arranged on the inner wall of the outer barrel (31) in a circumferential array;

an inner slide bar (321) is arranged on the outer wall of the inner cylinder (32) in a circumferential array, and the inner slide bar (321) is in sliding fit with the inner slide groove (311).

10. The vertical ball mill for grinding middlings of iron ore according to claim 7, wherein: the supporting legs (34) are arranged along the axial circumference array of the outer cylinder (31);

a second limiting ring (341) is fixedly connected to the bottom end of the supporting leg (34), and the second limiting ring (341) is in sliding fit with the annular limiting groove (161);

the upper end face of the second limiting ring (341) is matched with the upper end face of the ball milling chassis (16).