CN110523480A - A multi-grade mineral preparation machine - Google Patents

Abstract

The invention discloses a multi-grain grade mineral preparation machine, which comprises an installation platform, a grinding and screening device, and an overturning device arranged on the installation platform and used to drive the grinding and screening device to switch between a horizontal state and a vertical state The grinding and screening device includes a grinding cylinder, a screen, a barrel shell and a grinding motor. The grinding motor can drive the grinding cylinder to rotate around the axis to achieve grinding. The grinding motor is installed on the turning device. After the grinding operation is completed, the grinding cylinder is turned from a horizontal state to a vertical state through the turning device. During the rotation process, the minerals in the grinding cylinder will be gradually removed from the discharge port and screened through the screen. After the screening, turn the grinding cylinder to a horizontal state through the turning device, and then repeat the above grinding, turning, screening, and turning operations until the preparation operation is completed, and pure minerals of different particle sizes can be obtained. The degree of preparation is high. , high efficiency and low cost.

Description

A multi-grade mineral preparation machine

technical field

The invention relates to the technical field of mineral processing, in particular to a multi-grain grade mineral preparation machine.

Background technique

In the mineral processing field at home and abroad, flotation is the most widely used mineral processing method, so the study of the interaction mechanism between reagents and minerals has always been a research hotspot and focus at home and abroad. When studying the mechanism of action between pharmaceuticals and minerals, it is usually necessary to use pure minerals with a particle size of -200 to +400 mesh as the research object. With the mining of mineral resources, pure minerals are getting less and less, and their prices are getting higher and higher. Therefore, we hope that the unit mass of massive pure minerals can produce -200 ~ +400 mesh size pure minerals. The more the better.

At present, when preparing pure minerals of this particle size, the method of grinding massive pure minerals through a grinder is usually used, and then using 200 mesh and 400 mesh sieves for manual screening. In order to reduce the content of -400 mesh particle size during the preparation process, In order to reduce the waste of pure minerals, we can only reduce the single grinding time and increase the number of screenings. Although this can reduce the content of -400 mesh size, the production process is cumbersome and the efficiency is low, which increases the test cost.

Therefore, how to solve the problems of low efficiency and high cost in the preparation of multi-grained minerals is a technical problem to be solved by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a multi-grade mineral preparation machine, which realizes full automation of grinding and screening, improves preparation efficiency and reduces cost.

In order to solve the above technical problems, the present invention provides a multi-grade mineral preparation machine, which includes an installation platform and a grinding and screening device. The grinding and screening device includes a grinding cylinder for placing minerals and grinding balls, and a A screen for sieving minerals, a barrel shell for storing minerals, and a grinding motor for driving the grinding cylinder to rotate around the axis. The screen is installed at the discharge port at one end of the grinding cylinder The barrel shell is set outside the screen, the other end of the grinding cylinder is fixedly connected with the rotating shaft of the grinding motor, and the installation platform is provided with a device for driving the grinding and screening device Turning device that converts between horizontal and vertical positions.

Preferably, the sieve includes a cloth sieve for protecting grinding balls, a hemispherical sieve for sieving minerals, and a drum sieve set outside the hemispherical sieve, the sieve of the hemispherical sieve is larger than the Drum sieve.

Preferably, a steel ring is provided on the outer periphery of the cloth screen, and a plurality of openings for minerals to return to the grinding cylinder are provided on the steel ring.

Preferably, the overturning device includes a turntable and a rotating motor for driving the turntable to rotate vertically around a horizontal axis, the rotating motor is fixed on the installation platform, and the grinding motor is fixed on the rotating frame, and the rotation axis of the grinding motor is perpendicular to the rotation axis of the turntable.

Preferably, the turret includes a driving gear with a central axis arranged horizontally and driven by the rotating motor, and a driven ring gear meshed with the driving gear, the number of teeth of the driving gear is smaller than that of the driven ring gear, so A slide block is provided on the end face of the driven ring gear, a gear slideway is provided on the installation platform, a chute is provided on the gear slideway to slide with the slide block, and the grinding motor is fixed on the on the driven ring gear.

Preferably, the base of the grinding motor is fixed on the outside of the driven ring gear, and the rotating shaft of the grinding motor vertically passes through the driven ring gear and is connected to the grinding cylinder.

Preferably, a vibration device is also included, the vibration device includes a dark box, two slide bars, two cams and two cam motors that drive the cams to rotate, the installation platform is arranged above the dark box, and the two The cam motors are fixed side by side in the dark box, the two slide bars are arranged side by side, and each of the two slide bars is fixedly connected with a baffle plate, and the two baffle plates are arranged on the two cams. between the two cams or between the two baffles, and when the cams rotate, they can push the baffles to move left and right, and the front and rear side walls of the dark box are provided with limiting grooves, and the two Both ends of the slide bar pass through the limiting slot and are hinged on the installation platform.

Preferably, the installation platform is provided with a weight for balancing the weight of the grinding and screening device and the turning device.

Preferably, a controller and a control panel are also included, and the control panel is provided with a grinding screen horizontal button, a grinding screen vertical button, a grinding time setting knob, a grinding speed setting knob, a screening time setting knob, and a screening frequency setting knob. Knob, total working time setting knob, start button, end button and display.

Preferably, it also includes a casing, the casing includes a lower casing and a top cover, the vibration device and the installation platform are arranged in the lower casing, the control panel is arranged on the lower casing, and is located at On one side of the installation platform, a positioning block is provided on the side wall of the top cover, and a positioning hole matching the positioning block is provided on the side wall of the lower housing.

The multi-grade mineral preparation machine provided by the present invention includes an installation platform and a grinding and screening device. The grinding and screening device includes a grinding cylinder for placing minerals and grinding balls, a screen for screening minerals, and It is used for the barrel shell storing minerals and the grinding motor used to drive the grinding cylinder to rotate around the axis. The screen is installed at the discharge port at one end of the grinding cylinder, and the barrel shell is set outside the screen. The other end is fixedly connected with the rotating shaft of the grinding motor, and the installation platform is provided with a turning device for driving the grinding and screening device to switch between the horizontal state and the vertical state.

When preparing multi-grained pure minerals, first place the massive pure minerals and grinding balls of different sizes in the grinding cylinder, the grinding balls can be agate balls, and then fix the screen and barrel shell on the grinding cylinder in turn , and then fix the grinding cylinder and the shaft of the grinding motor to complete the preparatory work. In the initial state, the grinding motor and the grinding cylinder are in a horizontal state, and then start the grinding motor so that the grinding motor drives the grinding cylinder The grinding operation is realized by rotating around the axis, and the grinding operation is completed after the preset time. The grinding motor and the grinding cylinder are turned to a vertical state through the turning device, and the discharge port of the grinding cylinder is facing downward. In the process, the minerals in the grinding cylinder will be gradually removed from the discharge port and screened through the screen. After the screening is completed, the grinding motor and the grinding cylinder will be turned to a horizontal state through the turning device. The minerals in the sieve will automatically return to the grinding cylinder, and then repeat the above operations of grinding, turning, screening, and turning. Remove the sieve and barrel shell to obtain pure minerals of different particle sizes.

In summary, the multi-grade mineral preparation machine provided by the present invention realizes the automatic preparation of multi-grade pure minerals, improves the preparation efficiency, and reduces the preparation cost.

Description of drawings

Fig. 1 is the structural representation of a kind of specific embodiment of multi-grain grade mineral preparation machine provided by the present invention;

Fig. 2 is an exploded schematic diagram of a specific embodiment of the grinding and screening device provided by the present invention;

Fig. 3 is the structural representation of cloth screen;

Fig. 4 is the structural representation of hemispherical sieve;

Fig. 5 is an exploded schematic diagram of a specific embodiment of the turning device provided by the present invention;

Fig. 6 is a schematic structural view of a specific embodiment of the vibrating device provided by the present invention;

Fig. 7 is an exploded schematic diagram of a specific embodiment of the vibrating device provided by the present invention.

The marks in the attached drawings are as follows:

Shell 1, grinding and screening device 2, grinding cylinder 21, cloth screen 22, steel ring 221, opening 222, hemispherical screen 23, cylinder screen 24, barrel shell 25, grinding motor 26, sleeve 27, turning over Device 3, rotating motor 31, driving gear 32, driven ring gear 33, gear slideway 34, slider 35, vibration device 4, installation platform 41, dark box 42, slide bar 43, baffle plate 44, limit groove 45, Cam motor 46, cam 47, weight 48, control panel 5.

Detailed ways

The core of the present invention is to provide a multi-grade mineral preparation machine, which realizes full automation of grinding and screening, improves preparation efficiency and reduces cost.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Fig. 1 to Fig. 4, Fig. 1 is a structural schematic diagram of a specific embodiment of the multi-grade mineral preparation machine provided by the present invention; Fig. 2 is a specific implementation of the grinding and screening device provided by the present invention The decomposition diagram of the method; Fig. 3 is a schematic diagram of the structure of the cloth sieve; Fig. 4 is a schematic diagram of the structure of the hemispherical sieve.

The multi-grade mineral preparation machine provided by the specific embodiment of the present invention mainly includes an installation platform 41, a grinding and screening device 2 and a turning device 3 arranged on the installation platform 41, and the grinding and screening device 2 specifically includes a grinding cylinder 21. Screen, barrel shell 25 and grinding motor 26. The screen is installed at the outlet of one end of the grinding cylinder 21, and the barrel shell 25 is set outside the screen for storing minerals passing through the screen. The other end of the ore cylinder body 21 is fixedly connected with the rotating shaft of the ore grinding motor 26, and the ore grinding motor 26 can drive the ore grinding cylinder body 21 to rotate around the axis, thereby realizing the ore grinding. The ore grinding motor 26 is installed on the turning device 3, through The overturning device 3 can drive the grinding and screening device 2 to switch between a horizontal state and a vertical state.

When preparing multi-grained pure minerals, first place massive pure minerals and grinding balls of different sizes in the grinding cylinder 21, the specific grinding balls can be agate balls, and then fix the screen and barrel shell 25 on the grinding cylinder in turn. On the barrel 21, fix the rotating shaft of the ore grinding barrel 21 and the ore grinding motor 26 to complete the preparatory work. In the initial state, the ore grinding motor 26 and the ore grinding barrel 21 are in a horizontal state, and then start the ore grinding motor 26, Make the ore grinding motor 26 drive the ore grinding cylinder 21 to rotate around the axis to realize the ore grinding operation, finish the ore grinding operation after the preset time, turn the ore grinding motor 26 and the ore grinding cylinder 21 to a vertical state through the turning device 3, and The discharge port of the grinding cylinder 21 faces downward. During the rotation, the minerals in the grinding cylinder 21 will gradually move out from the discharge port and be sieved through the sieve. 3 Turn the grinding motor 26 and the grinding cylinder 21 to a horizontal state, and the minerals that have not passed through the screen will automatically return to the grinding cylinder 21, and then repeat the above grinding, turning, screening, and turning operations, and the preparation operation is over Finally, the ore grinding cylinder 21 is turned to a vertical state, and the sieve and barrel shell 25 are removed from the discharge port of the ore grinding cylinder 21 to obtain pure minerals of different particle sizes.

In summary, the multi-grade mineral preparation machine provided by the present invention realizes the automatic preparation of multi-grade pure minerals, improves the preparation efficiency, and reduces the preparation cost.

On the basis of the above specific implementation, in order to directly obtain minerals of different particle sizes, the screen may specifically include a primary sieve and a secondary sieve. The sieve of the primary sieve is larger than the secondary sieve. The sieve is sieved, and the minerals that pass through the primary sieve are then dropped into the secondary sieve for sieving.

Among them, the hemispherical sieve 23 can be used as the first-stage sieve, which is beneficial to return the minerals that have not passed through the first-stage sieve to the grinding cylinder 21, and the barrel sieve 24 can be used on the second-stage sieve, and the length and diameter of the barrel sieve 24 are preferably It is more than 3cm larger than the primary sieve, and the length and diameter of the barrel shell 25 are preferably greater than 3cm or more than the secondary sieve, so as to ensure that the minerals in the barrel shell 25 and the secondary sieve have a place to store, and will not return to the upper stage sieve through the sieve holes. Improved screening efficiency.

In addition, when it is necessary to select minerals with a particle size of -200 ~ +400 mesh, 200 mesh sieve can be used as the primary sieve, and 400 mesh sieve can be used as the secondary sieve. After the preparation operation is completed, the minerals in the secondary sieve are the Minerals that require particle size.

Further, in order to reduce the damage caused by the impact of the grinding balls on each other during the sieving process, a cloth sieve 22 can be arranged before the sieve for sieving minerals. The cloth sieve 22 is relatively soft, and the friction between the grinding balls can be greatly reduced through the cloth sieve 22. The degree of impact also plays a role in pre-screening.

Specifically, for the convenience of installation, a steel ring 221 is provided on the outer periphery of the cloth screen 22, and a plurality of rectangular openings 222 are preferably provided on the steel ring 221. 23 for screening, after the screening, the grinding cylinder 21 turns to be horizontal, at this time, the minerals on the hemispherical sieve 23 can return to the grinding cylinder 21 through the rectangular opening 222, and grind again, realizing Minerals on the hemispherical sieve 23 are automatically returned to the grinding cylinder 21.

On the basis of the above-mentioned specific embodiments, in order to facilitate the installation of the screen and the barrel shell 25, a threaded disc can be provided at the discharge port of the grinding cylinder 21, and the screen and the barrel shell 25 are threadedly connected with the threaded disc. Reliable and easy to assemble and disassemble; preferably, the tightening direction of the screen and barrel shell 25 is opposite to the rotation direction of the grinding motor 26, so that the screen and barrel shell 25 are not easy to loosen or fall off during grinding.

Please refer to FIG. 5 . FIG. 5 is an exploded schematic diagram of a specific embodiment of the turning device provided by the present invention.

On the basis of the above-mentioned specific embodiments, there are many kinds of turning devices 3 that can drive the grinding and screening device 2 to switch between the horizontal state and the vertical state. In a specific embodiment, the turning device 3 can specifically include The rotary frame and the rotary motor 31 used to drive the rotary frame to rotate vertically around the horizontal axis, the rotary motor 31 is fixed on the installation platform 41, the grinding motor 26 is fixed on the rotary frame, and the rotating shaft of the grinding motor 26 is perpendicular to the rotary frame The rotating shaft, when the rotary motor 31 drives the turntable to rotate around its horizontal rotating shaft, the grinding motor 26 can be forwarded to a vertical state by a horizontal state, and then be forwarded to a horizontal state by a vertical state.

In order to enable the grinding and screening device 2 to accurately switch between the horizontal state and the vertical state, it is necessary to precisely control the rotation angle of the turret. Preferably, the turret includes a drive gear 32 with a central shaft horizontally arranged and a drive gear 32 connected to the drive. The driven ring gear 33 meshed with the gear 32, the driving gear 32 is connected with the rotating shaft of the rotating motor 31, the grinding motor 26 is fixed on the driven ring gear 33, and the number of teeth of the driving gear 32 is smaller than that of the driven ring gear 33, and the rotating motor 31 When driving the driving gear 32 to rotate, the driving gear 32 drives the driven ring gear 33 to rotate, and the meshing between the driving gear 32 and the driven ring gear 33 can realize deceleration, and it is easier to realize precise control of the rotation angle.

Among them, the rotating motor 31 is preferably a stepping motor, which is an open-loop control motor that converts electrical pulse signals into angular displacement or linear displacement, and the forward and reverse angle of the driven ring gear 33 can be precisely controlled by the stepping motor.

For the convenience of the installation of the driven ring gear 33, a slider 35 can be provided on both ends of the driven ring gear 33, and a gear slideway 34 is provided on the installation platform 41, and the two gear slideways 34 are respectively located on the Both sides of driven ring gear 33, and gear slideway 34 is provided with the chute that slides with slide block 35, realizes that driven ring gear 33 is supported by gear slideway 34, and gear slideway 34 can be driven gear simultaneously. The rotation guide of ring 33.

Specifically, when the turning device 3 is assembled, the rotating motor 31 and the gear slideway 34 are fixed on the installation platform 41 , and a through hole for the driven ring gear 33 to pass through is provided on the installation platform 41 .

Further, in order to reduce the size of the preparation machine and facilitate the installation of the ore grinding and screening device 2, specifically, the base of the ore grinding motor 26 can be fixed on the outside of the driven ring gear 33, and the ore grinding cylinder 21 can be arranged on the driven Inside the ring gear 33 , the rotating shaft of the grinding motor 26 vertically passes through the driven ring gear 33 and is connected with the grinding cylinder 21 .

Specifically, in order to facilitate the connection between the ore grinding cylinder 21 and the ore grinding motor 26, a sleeve 27 can be welded at the end of the ore grinding cylinder 21 away from the screen. On the rotating shaft, the sleeve 27 can be fixedly connected with the rotating shaft of the grinding motor 26 by screws, and the connection method is simple and reliable.

As shown in Figure 1, when the ore grinding motor 26 and the ore grinding cylinder 21 are in a horizontal state, start the rotating motor 31 to rotate the driven ring gear 33 clockwise by 90°, and then the ore grinding motor 26 and the ore grinding cylinder 21 Turn to the vertical state, then the rotating motor 31 reverses to make the driven ring gear 33 rotate 90° counterclockwise, and the grinding motor 26 and the grinding cylinder 21 can be turned to a horizontal state.

In the multi-grain grade mineral preparation machine provided by the present invention, the structure of the overturning device 3 is not limited thereto, and the grinding motor 26 can also be hinged on an installation platform 41 through an overturning plate, and the overturning plate is driven by a hydraulic cylinder to turn over, also The ability to realize automatic grinding and screening operations is also within the protection scope of the present invention.

Please refer to Fig. 6 and Fig. 7, Fig. 6 is a structural diagram of a specific embodiment of the vibration device provided by the present invention; Fig. 7 is an exploded schematic diagram of a specific embodiment of the vibration device provided by the present invention.

On the basis of the above-mentioned specific embodiments, in order to better screen minerals and improve screening efficiency, the multi-grade mineral preparation machine provided by the present invention preferably further includes a vibrating device 4, and the vibrating device 4 may specifically include a dark box 42 , two slide bars 43, two cams 47 and two cam motors 46 that drive the rotation of the cam 47, the two cam motors 46 are fixed side by side in the dark box 42, the two slide bars 43 are arranged side by side, and the two slide bars 43 are respectively fixedly connected with a baffle plate 44, and two cams 47 are positioned between the two baffle plates 44, and when the cam 47 on the left side rotates, the baffle plate 44 on the left side can be pushed to move leftward, and when the cam 47 on the right side rotates, The baffle plate 44 on the right side can be pushed to move to the right. The front and rear side walls of the dark box 42 are provided with limiting grooves 45 .

When the cam motor 46 starts, it drives the cam 47 to rotate, and the cam 47 pushes the baffle plate 44 to move left and right. The platform 41 and the overturning device 3 and the grinding and screening device 2 installed on the installation platform 41 also make left and right reciprocating movements. , the cam motor 46 drives the installation platform 41 to move back and forth left and right, thereby realizing the screening of pure minerals.

Of course, two baffle plates 44 can also be arranged between the two cams 47, and the left side baffle plate 44 can be pushed to move to the right when the left side cam 47 rotates, and the right side cam 47 can be pushed to move rightward when the right side cam 47 rotates. The side baffle plate 44 moves to the left, and the rotation of the cam 47 can also be used to push the baffle plate 44 to move left and right.

Further, a weight 48 is preferably provided on the installation platform 41 , and the weight of the grinding and screening device 2 and the overturning device 3 can be balanced by the weight 48 to make the vibration more stable.

On the basis of the above-mentioned specific implementation methods, in order to realize fully automatic grinding and screening operations, the multi-grain grade mineral preparation machine provided by the present invention also includes a controller and a control panel 5, and a grinding machine can be installed on the control panel 5. Sieve horizontal button, grinding sieve vertical button, grinding time setting knob, grinding speed setting knob, sieving time setting knob, sieving frequency setting knob, total operation time setting knob, start button, end button and display screen.

When the multi-grade mineral preparation machine is in use, first place pure minerals and grinding balls of different sizes in the grinding cylinder 21, then fix the cloth screen 22 in the hemispherical sieve 23 through threads, and place the hemispherical sieve 23, The cylinder screen 24 and barrel shell 25 are fixed on the threaded plate on the grinding cylinder 21 through threads in turn, and then the sleeve 27 of the grinding cylinder 21 and the rotating shaft of the grinding motor 26 are fixed by screws. Body 21 is in a horizontal state, and then set the grinding time, rotating speed, screening time and frequency through the grinding time setting knob, grinding speed setting knob, screening time setting knob, screening frequency setting knob and total operation time setting knob , the total operating time, after setting, press the start button to start working: first the grinding motor 26 is started, which drives the grinding cylinder 21 to rotate, and the grinding operation is carried out; after the grinding work is completed, the rotating motor 31 is started, and through The gear 32 drives the driven ring gear 33 to rotate, turning the grinding cylinder 21 to a vertical state. During the rotation, the minerals and grinding balls are gradually poured on the screen cloth; then the cam motor 46 is started to push the baffle plate 44 to move back and forth, The installation platform 41 drives the overturning device 3 and the grinding and screening device 2 to move back and forth to realize the screening of pure minerals; after the screening is completed, the rotating motor 31 drives the driven ring gear 33 to rotate through the driving gear 32, and the grinding The ore cylinder 21 turns to the vertical state, and during the rotation, the minerals on the hemispherical screen 23 are gradually poured into the grinding cylinder 21 through the rectangular opening 222, and the grinding balls on the cloth screen 22 are also gradually poured into the grinding cylinder 21 , and then repeat the above grinding, rotation, screening, and rotation work; after the total operation is completed, press the grinding and sieving vertical button, and the rotating motor 31 will turn the grinding cylinder 21 into a vertical state through the driving gear 32 and the movable ring gear, Then the drum shell 25, the drum sieve 24, the hemispherical sieve 23 and the cloth sieve 22 are successively removed to obtain pure minerals of different particle sizes.

On the basis of the above-mentioned specific embodiments, the multi-grade mineral preparation machine provided by the present invention can preferably also be provided with the casing 1, the grinding and screening device 2, the turning device 3, etc. in the casing 1 to reduce the production of minerals. noise and dust pollution.

Specifically, the casing 1 includes a lower casing and a top cover, the vibrating device 4 is arranged in the lower casing, and the control panel 5 can be specifically arranged on the lower casing and is located on one side of the installation platform 41 .

Further, the bottom of the lower case can be provided with legs, the side wall of the top cover can be provided with a positioning block, the side wall of the lower case can be provided with a positioning hole matching the positioning block, the top cover and the lower case When the body is assembled, it is accurately positioned through the positioning block and the positioning hole.

In addition, in order to facilitate the observation of mineral preparation, the top cover and barrel shell 25 are preferably made of transparent organic glass.

In the description of the application documents of the present invention, it should be understood that the orientation or relationship indicated by the terms "upper", "lower", "horizontal", "vertical" and the like are based on the orientation or positional relationship shown in the accompanying drawings, only It is for ease of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention.

It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such relationship between these entities. Actual relationship or sequence.

In addition, each embodiment in the description is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the similar parts of the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant details, please refer to the description of the method part.

The multi-grade mineral preparation machine provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. A multi-grain grade mineral preparation machine is characterized in that it includes an installation platform (41) and a grinding and screening device (2), and the grinding and screening device (2) includes a set for placing minerals and grinding balls. Grinding cylinder (21), a screen for sieving minerals, a bucket shell (25) for storing minerals, and a grinding motor (26) for driving the grinding cylinder (21) to rotate around its axis , the screen is installed at the outlet of one end of the grinding cylinder (21), the barrel shell (25) is set outside the screen, and the other end of the grinding cylinder (21) It is fixedly connected with the rotating shaft of the grinding motor (26), and the installation platform (41) is provided with an overturning device ( 3). 2. The multi-grain grade mineral preparation machine according to claim 1, characterized in that, the screen cloth comprises a cloth screen (22) for protecting grinding balls, a hemispherical screen (23) for sieving minerals and A trommel screen (24) set outside the hemispherical sieve (23), the sieve hole of the hemispherical sieve (23) is larger than that of the trommel sieve (24). 3. The multi-grade mineral preparation machine according to claim 2, characterized in that, the outer periphery of the cloth screen (22) is provided with a steel ring (221), and the steel ring (221) is provided with a plurality of The minerals are returned to the opening (222) in the grinding barrel (21). 4. The multi-grain grade mineral preparation machine according to claim 1, characterized in that, the overturning device (3) comprises a turntable and a rotating motor (31) for driving the turntable to rotate vertically around a horizontal axis , the rotating motor (31) is fixed on the installation platform (41), the grinding motor (26) is fixed on the turntable, and the rotating shaft of the grinding motor (26) is perpendicular to the The axis of rotation of the turret. 5. The multi-grain grade mineral preparation machine according to claim 4, characterized in that, the turntable includes a driving gear (32) with a central axis horizontally arranged and driven by the rotating motor (31) and connected to the driving gear (32). The driven ring gear (33) meshed with the gear (32), the number of teeth of the driving gear (32) is smaller than that of the driven ring gear (33), and the end surface of the driven ring gear (33) is provided with a slider (35), the installation platform (41) is provided with a gear slideway (34), the gear slideway (34) is provided with a chute that slides with the slider (35), and the grinding The motor (26) is fixed on the driven ring gear (33). 6. The multi-grade mineral preparation machine according to claim 5, characterized in that, the base of the grinding motor (26) is fixed on the outside of the driven ring gear (33), and the grinding motor ( The rotating shaft of 26) vertically passes through the driven ring gear (33) and is connected with the grinding cylinder (21). 7. The multi-grain grade mineral preparation machine according to any one of claims 1 to 6, characterized in that, it also includes a vibrating device (4), and the vibrating device (4) includes a dark box (42), two slide bars (43), two cams (47) and two cam motors (46) that drive the rotation of the cam (47), the installation platform (41) is located above the dark box (42), and the two cams The motor (46) is fixed side by side in the dark box (42), the two slide bars (43) are arranged side by side, and each of the two slide bars (43) is fixedly connected with a baffle plate (44), The two baffle plates (44) are all arranged between the two cams (47) or the two cams (47) are located between the two baffle plates (44), and the cams (47) When rotating, the baffle plate (44) can be promoted to move left and right, and the front and rear side walls of the dark box (42) are provided with limiting grooves (45), and the two ends of the two slide bars (43) pass through the limiting grooves. The slot (45) is hinged on the installation platform (41). 8. The multi-grade mineral preparation machine according to claim 7, characterized in that, the installation platform (41) is provided with a device for balancing the grinding and screening device (2) and the turning device (3) Heavy weights (48). 9. The multi-grain grade mineral preparation machine according to claim 8, is characterized in that, also comprises controller and control panel (5), and described control panel (5) is provided with grinding sieve horizontal button, grinding sieve vertical button , Grinding time setting knob, grinding speed setting knob, screening time setting knob, screening frequency setting knob, total working time setting knob, start button, end button and display screen. 10. multi-grain grade mineral preparation machine according to claim 9, is characterized in that, also comprises shell (1), and described shell (1) comprises lower casing and top cover, and described vibrating device (4) and described The installation platform (41) is arranged in the lower casing, the control panel is arranged on the lower casing and is located on one side of the installation platform (41), and the side wall of the top cover is provided with As for the positioning block, the side wall of the lower housing is provided with a positioning hole matching the positioning block.