CN113856841A - Circulating grinding mechanism of sand mill and sand mill - Google Patents

Abstract

The invention provides a circulating grinding mechanism of a sand mill and the sand mill; wherein, the circulating grinding mechanism of the sand mill comprises an impeller; the impeller is provided with a forward channel obliquely penetrating through the impeller and a reverse channel obliquely penetrating through the impeller; the inclination direction of the forward channel can ensure that the material moves forward when the impeller rotates along with the main shaft; the forward channel is close to the shaft hole of the impeller; the inclination direction of the reverse channel can ensure that the material moves reversely when the impeller rotates along with the main shaft; the reverse channel is far away from the shaft hole of the impeller. According to the circulating grinding mechanism of the sand mill, the forward channel which obliquely penetrates through the impeller is formed in the position, close to the shaft hole, of the impeller, and the reverse channel which obliquely penetrates through the impeller is formed in the position, close to the peripheral edge of the impeller, so that larger material particles move forwards in a reverse direction and are circularly ground into smaller material particles, and the problems of grinding bead accumulation, material discharging screen blockage, working temperature rise and uneven ground product particle thickness of the sand mill are solved.

Description

Circulating grinding mechanism of sand mill and sand mill

Technical Field

The invention relates to the technical field of grinding equipment, in particular to a circulating grinding mechanism of a sand mill and the sand mill.

Background

In the related scheme, the grinding mode adopted by the sand mill is that the material reaches the separation net at the rear end after being ground by the grinding mechanism, and the ground material is separated from the grinding beads by the separation net and then is output. The proposal can cause the problems of bead accumulation, net blockage during discharging, temperature rise, uneven product particle thickness and the like.

Therefore, there is a need for a grinding mechanism for a sander to grind larger material particles in a grinding chamber into smaller material particles that are more uniform, thereby avoiding the problems of bead build-up, material blockage, temperature increase, etc.

Disclosure of Invention

In order to solve the problems of bead accumulation, net blockage during discharging, temperature rise, uneven product particle thickness and the like in the related schemes, the invention provides a circulating grinding mechanism of a sand mill, which can grind more uniform and smaller material particles.

A circulating grinding mechanism of a sand mill comprises an impeller;

the impeller is provided with a forward channel obliquely penetrating through the impeller and a reverse channel obliquely penetrating through the impeller;

the inclination direction of the forward channel can ensure that the material moves forward when the impeller rotates along with the main shaft; the forward channel is close to the shaft hole of the impeller;

the inclination direction of the reverse channel can enable the impeller to rotate along with the main shaft, so that the material moves reversely; the reverse channel is far away from the shaft hole of the impeller.

Further, the reverse channel is a notch formed in the peripheral edge of the impeller.

Furthermore, the reverse channels are distributed on the peripheral edge of the impeller.

Further, the forward channel is a through hole opened on the impeller.

Furthermore, the forward channels are distributed around the shaft hole.

The circulating grinding mechanism of the sand mill further comprises a spacer bush;

the plurality of impellers are arranged on the main shaft in parallel;

the spacer bush is sleeved on the main shaft and positioned between two adjacent impellers.

The invention also provides a sand mill, which comprises a main shaft, a separation mechanism and the circulating grinding mechanism of the sand mill;

the circulating grinding mechanism of the sand mill is arranged on the main shaft and is used for circularly grinding larger material particles in the material along with the rotation of the main shaft;

the separation mechanism is mounted on the main shaft and used for separating larger material particles and smaller material particles in the material so as to supply the larger material particles to the circulating grinding mechanism of the sand mill for circulating grinding.

Furthermore, a material output channel is formed in the main shaft, and a through hole communicated with the material output channel and the outer space of the main shaft is formed in the circumferential wall of the main shaft, so that the small material particles separated by the separating mechanism are output to the sand mill.

Further, the sand mill still includes:

the cylinder barrel is internally provided with a grinding cavity, and the inner wall of the grinding cavity is fixedly provided with a convex block protruding inwards.

Further, the bump has an inclined slope.

According to the technical scheme, the invention has at least the following advantages and positive effects:

according to the circulating grinding mechanism of the sand mill, the forward channel which obliquely penetrates through the impeller is formed in the position, close to the shaft hole, of the impeller, and the reverse channel which obliquely penetrates through the impeller is formed in the position, far away from the shaft hole, of the impeller, so that larger material particles move forwards in a reverse direction and are circularly ground into smaller material particles, and the problems of grinding bead accumulation, discharging screen blockage, working temperature rise and uneven ground product particle thickness of the sand mill are solved.

Drawings

Fig. 1 is a schematic perspective view of a circular grinding mechanism disposed on a spindle according to an embodiment of the present invention.

Fig. 2 is a front view schematically illustrating an impeller according to an embodiment of the present invention.

Fig. 3 is a schematic perspective view of an impeller according to an embodiment of the present invention.

Fig. 4 is a schematic view of the distribution of particles in a high velocity rotating flow field.

Fig. 5 is a schematic perspective view of a sand mill according to an embodiment of the present invention.

Fig. 6 is a schematic structural view of the circular grinding mechanism and the separating mechanism disposed in the cylinder according to an embodiment of the present invention.

Fig. 7 is a schematic perspective view of a cylinder barrel according to an embodiment of the present invention.

Fig. 8 is a schematic cross-sectional view of the cylinder liner along the axial direction thereof according to an embodiment of the present invention.

Fig. 9 is a partial perspective view of a spindle according to an embodiment of the invention.

FIG. 10 is a schematic view of a partial cross-section of a spindle along an axial direction thereof in accordance with an embodiment of the present invention.

Fig. 11 is a schematic view of the internal structure of the separating mechanism with the outer cover removed in accordance with an embodiment of the present invention.

Fig. 12 is a schematic perspective view of an external appearance of a separating mechanism according to an embodiment of the invention.

Fig. 13 is a perspective view of the first separation turbine according to an embodiment of the present invention.

Fig. 14 is a schematic sectional view of the cylindrical portion in a direction perpendicular to the axial direction thereof according to an embodiment of the present invention.

Fig. 15 is a rear view schematically showing the structure of the first separation turbine according to the embodiment of the present invention.

Fig. 16 is a perspective view of the second separation turbine according to an embodiment of the present invention.

Fig. 17 is a schematic sectional view of the second separation turbine in a direction perpendicular to the axial direction thereof according to the embodiment of the present invention.

Fig. 18 is a schematic perspective view of a discharge pipe network according to an embodiment of the present invention.

Fig. 19 is a schematic view of the small circulation path of the material at the circulating grinding mechanism and the small circulation path at the separating mechanism, respectively, in one embodiment of the invention.

FIG. 20 is a schematic view of the large circulation path of the material between the circulating grinding mechanism and the separating mechanism in one embodiment of the present invention.

The reference numerals are explained below:

1. an impeller; 11. a shaft hole; 12. a forward channel; 13. a reverse channel; 14. a pin-shaped projection;

2. a spacer sleeve;

100. a frame; 110. a guide rail;

200. a cylinder barrel; 210. a cylinder barrel outer sleeve; 220. a cylinder barrel inner container; 221. grinding a cavity; 230. a bump; 240. a support; 250. a guide wheel; 260. a feed pipe; 270. a discharge pipe;

300. a motor;

400. a transmission mechanism;

500. a main shaft; 510. a material output channel; 520. a via hole;

600. a separating mechanism; 610. a first separation turbine; 611. a cylindrical portion; 6111. a first separation hole; 6112. a pin block; 612. a disk portion; 6121. mounting holes; 6122. a through hole; 620. a second separation turbine; 621. a second separation well; 630. a discharge pipe network; 631. a net frame; 632. a separation net; 640. an outer gland;

700. a circulating grinding mechanism;

800. a cooling system.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, a detachable connection, or an integral connection. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the invention, the direction in which the material moves in the grinding chamber of the sand mill along the axis of the main shaft and towards the separating screen is referred to as rearward, and the direction opposite to rearward is referred to as forward. Viewed from the front to the rear, the left side is defined as left and the right side as right.

In the related scheme, a grinding mechanism and a separation net are arranged in a grinding cavity of the horizontal sand mill, material slurry in the grinding cavity reaches the separation net at the rear end together with grinding beads after being ground by the grinding mechanism, and the separation net outputs ground material products after separating the grinding beads in the slurry.

In actual use, because the thickness of the ground material product is uneven, the separation net is easy to block, the grinding balls are easy to accumulate, and the temperature of the equipment is further increased.

Referring to fig. 1, the embodiment of the invention provides a circulating grinding mechanism of a sand mill, which comprises an impeller 1 and a spacer 2.

Referring to fig. 2 and 3, the impeller 1 is provided with a shaft hole 11 so that the impeller 1 can be mounted on a main shaft of a sand mill. A key groove can be formed in the inner wall of the shaft hole 11 of the impeller 1, so that the impeller 1 and the main shaft can form key connection, and further the impeller 1 rotates along with the rotation of the main shaft, so that grinding beads and material slurry are stirred to move to grind materials.

In some embodiments, the impeller 1 is provided with a forward channel 12 extending obliquely through the impeller 1 and a reverse channel 13 extending obliquely through the impeller 1. That is, the extending direction of the forward channel 12 and the extending direction of the backward channel 13 are different from the extending direction of the shaft hole 11 of the impeller 1, so that the extending direction of the forward channel 12 and the extending direction of the backward channel 13 have a certain included angle with the axial direction of the main shaft. When the impeller 1 rotates along with the main shaft, the materials and the grinding beads passing through the forward channel 12 and the reverse channel 13 can be pushed to move forwards or backwards.

The inclination directions of the forward channel 12 and the reverse channel 13 are opposite. For example, the forward channel 12 is inclined to the left and the reverse channel 13 is inclined to the right, so that when the impeller 1 rotates, the material and the grinding balls passing through the forward channel 12 are pushed to move backward and the material and the grinding balls passing through the reverse channel 13 are pushed to move forward.

Specifically, the forward passage 12 may be opened near the shaft hole 11 near the impeller 1. The forward channels 12 may be formed in plural numbers around the shaft bore 11 so that when the main shaft of the sander is rotated, the material slurry and grinding beads in the grinding chamber can flow from front to back and grind the material in the vicinity of the periphery of the main shaft.

The reverse channel 13 is far from the shaft hole 11 of the impeller 1. For example, the reverse channel 13 may be opened near the outer peripheral edge of the impeller 1. The reverse channels 13 can be distributed along the peripheral edge area of the wheel to form a plurality of channels, so that when the impeller 1 rotates along with the main shaft, larger material particles in the grinding cavity can reversely flow from back to front in the edge area close to the impeller 1 (namely, the area far away from the main shaft in the grinding cavity), and further are ground in the flowing process. After the larger material particles flow reversely to reach the front of the impeller 1, the larger material particles can enter the forward channel 12 again, flow from front to back and are ground again.

It is understood that in this embodiment, the number, the structural form, and the like of the forward channels 12 and the reverse channels 13 can be set according to actual needs, and the technical effect can be achieved to a certain extent as long as the principle of the above scheme is met.

In some embodiments, the reverse channel 13 is a notch obliquely formed on the peripheral edge of the impeller 1, so that the reverse channel 13 is in an oblique groove shape, thereby not only reducing the overall weight of the impeller 1, but also increasing the space for the material to flow in the reverse direction.

The projecting edge portion of the impeller 1 is in the form of a pin block, which is referred to herein as a pin block projection 14. During the rotation of the impeller 1, the parts of the moving pin-block-shaped projections 14 that are stationary in the grinding chamber can produce a relatively large movement, which in turn increases the grinding of the material particles.

The impeller 1 in the above embodiments may have other various modified structures, but it is within the scope of the present invention to achieve the same technical effects and the same structural principles as the present invention.

In some embodiments, the cyclical grinding mechanism comprises a plurality of impellers 1. The impellers 1 are arranged on the main shaft from front to back at intervals according to the installation mode, so that materials flowing forwards or reversely can be ground for multiple times. The number of impellers 1 can be set according to actual needs.

It will be appreciated that the provision of only one impeller 1, which meets the above structural features, is also to some extent technically effective in cyclic grinding.

Referring to fig. 4, in a circular high-speed rotating flow field, the distribution rule of particles is: the particle size of the particles gradually increases from the smallest to the largest from the center to the largest diameter. That is, the smaller the particle size, the closer to the center of the circle, the larger the particle size, the closer to the edge.

Similarly, in the high-speed rotating flow field formed in the grinding chamber, the larger grinding beads are farther away from the main shaft, and the smaller grinding beads are closer to the main shaft. The farther from the spindle, the greater the density distribution of the beads; the closer to the main axis, the smaller the density distribution of the beads.

In a rotating flow field formed in the grinding cavity, the farther away from the main shaft, the greater the rotating linear velocity is, so that the grinding strength of material particles is higher; the closer to the main shaft, the lower the linear velocity of rotation, and the lower the grinding strength of the material particles.

The gap (reverse channel 13) of the edge of the impeller 1 is provided with an inclination, the rotation can generate a backward thrust, so that the fluid (including material particles and grinding beads) on the inner layer and the outer layer of the grinding cavity circularly flows backward (namely in a reverse direction), and the ground time in the grinding cavity is prolonged. By repeating such a cycle, the larger material particles will be ground quickly.

The impeller 1 is close to the inclined hole (forward channel 12) around the shaft hole 11, is closest to the main shaft, and is also the place where the minimum particles are concentrated. When the impeller 1 rotates, the inclined holes (forward channels 12) generate a forward pushing effect on slurry, and push the smallest particles in the grinding cavity to the separating mechanism, so that the smallest particles in the grinding cavity are quickly discharged out of the grinding cavity, and the small particles cannot be over-ground (the over-grinding is not good, and the over-grinding is over-ground).

The rate at which small particles become smaller is also relatively slow. The time of the small particles in the grinding cavity is short, the time of the small particles to be ground is short, the occupied energy consumption is low, and the electric energy can be saved.

Through such repeated and cyclic grinding, larger material particles are quickly ground into smaller material particles, the smaller material particles are reduced at a lower speed, and finally the obtained product has very uniform particle size and narrow particle size distribution range, which is an ideal result pursued by powder preparation.

The large particles are ground for a long time, and power (electric energy) is mainly used for effectively grinding the large particles, so that the grinding efficiency is greatly improved, the product quality is improved, and meanwhile, the energy conservation and the environmental protection are realized.

The spacer bush 2 is sleeved on the main shaft, and the spacer bush 2 and the impeller 1 are alternately arranged to separate two adjacent impellers 1 by a certain distance. The diameter of the spacer bush 2 is larger than the diameter of the shaft hole 11 of the impeller 1 and smaller than the distance from the positive channel 12 to the axial lead of the shaft hole 11, so that the influence on the material flowing through the positive channel 12 on the impeller 1 is avoided.

Referring to fig. 5 and 6, the present invention also provides a sand mill. The sander comprises a frame 100, a cylinder 200, a motor 300, a transmission mechanism 400, a main shaft 500 and a separation mechanism 600, and a circulating grinding mechanism 700 in the above embodiment.

The frame 100 is a carrier that mounts other components of the sander. In some embodiments, the frame 100 is provided with guide rails 110 in the front-rear direction to facilitate mounting or dismounting of the cylinder 200.

Referring to fig. 7, the cylinder 200 is mounted on the frame 100. The cylinder 200 includes a cylinder jacket 210 and a cylinder liner 220, and the cylinder jacket 210 is sleeved outside the cylinder liner 220.

The cylinder jacket 210 supports and protects the cylinder liner 220, and the cylinder jacket 210 is not required to be arranged or the cylinder jacket 210 and the cylinder liner 220 are designed into the integrated cylinder 200 under the condition of less strict requirements.

The inner cavity of the cylinder liner 220 is the grinding chamber 221. The grinding chamber 221 can accommodate the separating mechanism 600 and the circulating grinding mechanism 700, and the separating mechanism 600 and the circulating grinding mechanism 700 operate in the grinding chamber 221 to drive the material slurry and the grinding beads in the grinding chamber 221 to move, so as to grind the material in the grinding chamber 221.

A plurality of inward convex blocks 230 are fixed on the inner wall of the grinding chamber 221. Under the interaction of the protrusions 230 fixed on the inner wall of the grinding chamber 221, the pin blocks on the separating mechanism 600 and the pin block-shaped protrusions 14 on the circulating grinding mechanism 700, the grinding balls can be driven to move relatively greatly, and the grinding effect on the materials is further improved.

Referring to fig. 8, in some embodiments, the tab 230 has a sloped surface that is obliquely disposed. The slope of the projection 230 is in the same direction as the slope of the counter channel 13 of the endless grinding means 700 and the slope of the pin of the separating means 600. The beveled protrusions 230 serve to push the larger material particles and beads of the outer layer in a circular motion back to the grinding chamber 221, thereby increasing the grinding time of the larger material particles in the grinding chamber.

Specifically, the bump 230 may be a block structure with a uniform thickness, and the bump 230 may be inclined to form an inclined surface. The inclined angle of the inclined plane can be selectively set in the range of 10-20 degrees according to actual requirements.

The front and rear ends of the cylinder barrel 200 are provided with sealing covers. After the sand mill is assembled, the grinding chamber 221 in the cylinder 200 is sealed except that the inlet and outlet of materials and media, such as the feed pipe, the discharge pipe, and the bead filler, are in necessary communication with the grinding chamber 221 in the cylinder 200.

The cylinder 200 is fixed on the bracket 240, and the guide wheel 250 is mounted at the bottom of the bracket 240, and the guide wheel 250 can roll on the guide rail 110 of the frame 100. Further, the cylinder 200 can be translated on the frame 100 by the arrangement of the guide rail 110 and the guide wheel 250, so as to facilitate the mounting and dismounting of the cylinder 200, the maintenance and assembly of the sander, and the like.

The motor 300 is fixed on the frame 100, and the motor 300 is in transmission connection with the main shaft 500 through the transmission mechanism 400 to drive the main shaft 500 to rotate. The main shaft 500 is rotatably mounted on the frame 100 to mount and drive the separation mechanism 600 and the endless grinding mechanism 700.

Referring to fig. 9 and 10, in some embodiments, a material output channel 510 is formed within the main shaft 500. For example, the main shaft 500 may be a hollow shaft, and a cavity in the hollow shaft may serve as the material output passage 510. The circumferential wall of the main shaft 500 is provided with a through hole 520 communicating the material output channel 510 and the outer space of the main shaft 500, and the smaller material particles separated by the separation mechanism 600 can flow into the material output channel 510 along with the slurry through the through hole 520.

The material output channel 510 in the main shaft 500 can be designed to be closed at the rear end and open at the front end, i.e., the smaller material particles output can flow from back to front in the main shaft 500 with the slurry. The material output channel 510 front end intercommunication is located the discharging pipe 270 of sand mill front side, and then the material product that the grinding gained can be exported outside the sand mill from discharging pipe 270.

Referring to fig. 11 and 12, in some embodiments, separation mechanism 600 includes a first separation turbine 610, a second separation turbine 620, a discharge pipe network 630, and an outer gland 640.

Referring to fig. 13, 14 and 15, the first separation turbine 610 includes a cylindrical portion 611 and a disk portion 612.

The cylindrical portion 611 has a cylindrical shape with a hollow cavity therein, and a first separation hole 6111 is formed in the cylindrical wall of the cylindrical portion 611. The first separation hole 6111 penetrates the wall of the cylindrical portion 611 obliquely, so that the first separation hole 6111 can communicate the space on the inner side and the outer side of the wall of the cylindrical portion 611, and larger material particles and grinding beads in the cylindrical portion 611 can flow out of the cylindrical portion 611 along with the slurry through the first separation hole 6111.

The first separation hole 6111 penetrates the wall of the cylindrical portion 611 obliquely, which means that the penetrating direction of the first separation hole 6111 is not along the radial direction of the cylindrical portion 611, but forms an angle with the radial direction of the cylindrical portion 611. The angle makes the inner wall of the inclined first separation hole 6111, like the blade of the turbine, throw the larger material particles and the grinding beads out of the cylindrical part 611 with the slurry when the cylindrical part 611 rotates around the main shaft 500, thereby realizing the separation function of the larger particles (including the larger material particles and the grinding beads) and the smaller material particles.

The first split holes 6111 may be strip-shaped holes having a longitudinal direction parallel to the axial direction of the cylindrical portion 611. The first separating holes 6111 can be uniformly distributed on the wall of the cylindrical part 611 to form a plurality of first separating holes, so that the first cylindrical wall is in a hollow state, the weight of the first separating turbine 610 is effectively reduced, and the material can be more smoothly and efficiently separated and flowed.

In some embodiments, a pin block 6112 is secured to the outer side of the wall of the cylindrical portion 611. The surface of the pin block 6112 facing the rotation direction of the cylindrical portion 611 is an inclined surface, so that when the pin block 6112 rotates along with the cylindrical portion 611, the inclined surface facing the rotation direction can convey separated larger material particles together with grinding beads along with the slurry to the front circulating grinding mechanism 700 like an inclined blade, and further the larger material particles are ground again at the circulating grinding mechanism 700.

Specifically, the pin blocks 6112 may be disposed in plurality to avoid the first separating holes 6111, thereby improving the efficiency and effect of conveying the material. The pin block 6112 protruding from the wall of the cylindrical part 611 can also generate a large relative movement with the protrusion 230 fixed on the inner wall of the grinding cavity 221 under the condition of rotation, so as to drive the grinding beads to collide and extrude each other violently, thereby improving the grinding effect on the materials in the slurry.

The disk portion 612 is fixed to one end of the cylindrical portion 611, so that the first split turbine 610 has a barrel shape with an opening at one end. The disc portion 612 and the cylindrical portion 611 may be integrally formed. The end to which the disk 612 is secured is adjacent to the endless grinding mechanism 700 when installed for use in a sander.

The disk portion 612 is provided with a mounting hole 6121 matched with the spindle 500. Through the matching and key connection of the mounting hole 6121 and the main shaft 500, the first separation turbine 610 can be mounted on the main shaft 500 and can be driven by the main shaft 500 to operate.

The disk-shaped part 612 is provided with through holes 6122 in an inclined manner like the forward channel 12 on the impeller 1, and when the disk-shaped part 612 rotates along with the main shaft 500, the inner walls of the inclined through holes 6122 can convey material particles, grinding beads and the like into the inner cavity of the cylindrical part 611 along with slurry like inclined blades.

In some embodiments, the first separation turbine 610 may not be provided with the disk portion 612, and the cylindrical portion 611 may be supported and carried by other components.

For example, one end of the cylindrical portion 611 may be directly fixed to the impeller 1 of the front circulating grinding mechanism 700. Therefore, the impeller 1 can support the cylindrical portion 611 and rotate the cylindrical portion 611 by replacing the disk portion 612, and can feed the ground material and the like into the cylindrical portion 611.

Other members may be provided to mount and support the cylindrical portion 611 on the main shaft 500, and the material or the like may be introduced into the cylindrical portion 611 by the inertia of the material or the like ground by the circulating grinding mechanism 700 moving backward.

In some embodiments, the disk portion 612 may also serve only the mounting, supporting, and entraining functions of the barrel portion 611 on the spindle 500.

For example, the disk 612 may have a wheel shape with spokes or a hollow disk shape without the inclined through hole 6122. The material or the like is introduced into the cylindrical portion 611 by the inertia of the backward movement, or by the conveying action of other mechanisms.

In some embodiments, the disk portion 612 may also be provided separately from the cylindrical portion 611.

In this case, the disk portion 612 no longer has a mounting and supporting function on the cylindrical portion 611, and cannot rotate the cylindrical portion 611. The cylindrical portion 611 is mounted, supported, and carried by other components. The inclined through hole 6122 of the disk portion 612 can still be used to convey materials and the like in the cylindrical portion 611.

Referring to fig. 16 and 17, the second separation turbine 620 has a cylindrical shape having a cavity therein, and is fitted in the cavity of the first separation turbine 610 to be coaxial with the cylindrical portion 611 of the first separation turbine 610, thereby forming a two-stage separation mechanism.

The second separation turbine 620 has a second separation hole 621 formed on the wall thereof. The second separation hole 621 penetrates the wall of the second separation turbine 620 in an inclined manner, so that the spaces on the inner side and the outer side of the second separation turbine 620 are communicated through the second separation hole 621.

The inclination direction of the second separation hole 621 coincides with the inclination direction of the first separation hole 6111 in the cylindrical portion 611 described above. The second separation hole 621 may be a strip-shaped hole having a length direction parallel to the axial direction of the second separation turbine 620. The second separation hole 621 can be uniformly distributed on the wall of the second separation turbine 620 to form a plurality of second separation holes, so that the wall of the second separation turbine 620 is in a hollow state, the weight of the second separation turbine 620 is effectively reduced, and the separation flow of materials is more smooth and efficient.

The outer side surface of the cylindrical wall of the second divided turbine 620 is spaced apart from the inner side surface of the cylindrical wall of the cylindrical portion 611 of the first divided turbine 610 by a predetermined distance. Thus, sufficient separation space and time are provided to make the separation more thorough.

The front end of the second separation turbine 620 is detachably fixed to the disk portion 612 of the first separation turbine 610, so that the second separation turbine 620 is supported and driven by the disk portion 612 of the first separation turbine 610.

The radius of the second split turbine 620 is smaller than the distance of the through hole 6122 on the disk portion 612 to the axial line of the first split turbine. That is, in the radial direction, the through hole 6122 is located between the second separation turbine 620 and the inner wall of the cylindrical portion 611, so that the materials and the grinding beads entering the first separation turbine 610 from the through hole 6122 are located inside the first separation turbine 610 and outside the second separation turbine 620.

After the material slurry and the grinding beads enter the first separation turbine 610 through the through hole 6122, part of the grinding beads and significantly oversized material particles can be thrown out of the first separation turbine 610 through the first separation hole 6111 formed in the cylindrical portion 611 first under the action of centrifugal force.

The next largest material particles, although smaller relative to the significantly larger material particles described above, still belong to the larger material particles relative to the smaller material particles. Due to the pumping action of the second separation turbine 620 and the centrifugal force action of the next largest material particles and grinding beads, the next largest material particles and grinding beads cannot pass through the second separation holes 621 into the second separation turbine 620.

These next largest particles of the material and the remaining grinding beads are finally thrown out of the first separation turbine 610 through the first separation hole 6111 formed in the cylindrical portion 611 by the centrifugal force, the pumping action of the second separation turbine 620, and the pumping action of the first separation turbine 610.

Smaller material particles can enter the second separation turbine 620 through a second separation hole 621 formed in the second separation turbine 620 along with the slurry, and then pass through a discharge pipe network 3 arranged in the second separation turbine 620 to enter a material output channel to be output to a sand mill.

Thereby, not only realized the fractionation function to material granule, made the material separation effect better, still avoided the working process in the mill pearl contact ejection of compact pipe network 3 and the ejection of compact pipe network 3 of wearing and tearing.

After the sand mill is stopped, the first separation turbine 610 and the second separation turbine 620 are not rotated any more, the larger material particles and the grinding beads in the slurry lose the centrifugal force, and the pumping and pumping action of the first separation turbine 610 and the second separation turbine 620 are not performed any more, and the larger material particles and the grinding beads in the slurry may enter the second separation turbine 620 along the second separation hole 621. Due to the blocking effect of the discharge pipe network 3, the grinding beads can not pass through the discharge pipe network 3 to enter the material output channel.

Once the sand mill is started, the first separation turbine 610 and the second separation turbine 620 start to operate, and the larger material particles and grinding beads in the second separation turbine 620 are thrown out of the second separation turbine 620 through the second separation hole 621 under the centrifugal force and the pumping action of the second separation turbine 620, and then the larger material particles and grinding beads reach the outside of the first separation turbine 610 through the pumping action of the first separation turbine 610 to realize the separation effect.

Referring to fig. 18, the discharging pipe network 630 is sleeved on the main shaft 500 and located in the cavity of the second separation turbine 620 to cover the through hole 520 on the main shaft 500, so as to prevent the unseparated grinding balls from entering the material output channel 510.

In the case where only the first separation turbine 610 is provided, the discharge pipe network 630 is located in the cavity of the cylindrical portion 611 of the first separation turbine 610.

The front end of the outlet pipe network 630 is detachably fixed on the disk-shaped part 612, so that the outlet pipe network 630 is installed and supported.

The discharge pipe network 630 comprises a net rack 631 and a separation net 632. The separating net 632 is fixed on the net rack 631 to form a tubular discharging pipe network 630 to cover the through hole 520 opened on the main shaft 500.

The outer gland 640 is detachably fixed to the rear end of the main shaft 500 by screws, and is used for detachably fixing the rear end of the first separation turbine 610, the rear end of the second separation turbine 620, and the rear end of the discharge pipe network 630.

The sand mill provided by the invention is also provided with a cooling system 800 for dissipating heat and cooling the shaft seal of the main shaft 500 in operation.

In summary, the sand mill and the circulating grinding mechanism 700 of the sand mill of the present invention have the following specific working processes:

after the sand mill is started, the main shaft 500 drives the circulating grinding mechanism 700 and the separating mechanism 600 to operate. Slurry of material to be ground enters the cylinder 200, i.e. the grinding chamber 221, from a feed pipe 260 provided at the front side of the cylinder 200.

The slurry of material is mixed with the milling beads in the milling chamber 221 under agitation by the recirculating grinding mechanism 700. The slurry of the mixed beads passes through the forward channel 12 of the impeller 1 from a region near the main shaft 500 and continues to flow backward by the pumping action of the forward channel 12.

Under the stirring action of the rotation of the impeller 1 and the backward flowing process of the slurry, the grinding beads in the slurry continuously generate collision, friction, extrusion and other motions, so that the material particles in the slurry are crushed by grinding, shearing and other crushing actions, and the larger material particles in the slurry are broken into smaller material particles.

Under the action of the rotation of the impellers 1, the material particles in the slurry are broken continuously. As the slurry flows backwards, the larger particles of material therein decrease and the smaller particles of material increase. The slurry eventually flows into the separation mechanism 600, and the separation mechanism 600 separates out the smaller material particles for output to the sand mill via the material output channel 510, and re-delivers the larger material particles and grinding beads to the circulating grinding mechanism 700 for re-grinding.

In the rotating flow field, the rotating flow field has certain tendency characteristics that small particles approach inwards and large particles approach outwards. The moving path and the changing process of the material are described below by a for the moving path of the larger material particles and B for the moving path of the smaller material particles.

Referring to fig. 19, due to the pumping action of the forward channels 12 on the impellers 1, the material entering the grinding chamber 221 gradually passes through the forward channels 12 of all the impellers 1 from front to back to enter the separating mechanism 600, and the larger material particles a in the slurry are continuously broken into smaller material particles B in motion.

The material particles in the slurry are crushed once every time the slurry passes through the forward channel 12 of the impeller 1, and the material particles passing through the forward channel 12 of the impeller 1 are mostly in a mixed state of larger material particles a and smaller material particles B.

Under the action of the rotating flow field, part of the larger material particles a move outwards and away from the main shaft 500 in the opposite direction, and then reach the vicinity of the reverse channel 13 of the impeller 1, and under the pumping action of the reverse channel 13, move forwards along the vicinity of the inner wall of the grinding cavity 221, and are crushed again in the process. While the smaller material particles B continue to move backwards through the forward channel 12 of the previous impeller 1, along the region near the main shaft 500.

If the larger material particles a are not crushed into smaller material particles B after passing through the reverse channel 13 of one impeller 1 and the region near the inner wall of the grinding cavity 221 corresponding to the impeller 1, the larger material particles a will continue to move forward under the pumping of the reverse channel 13 of the previous impeller 1 and enter the reverse channel 13 of the previous impeller 1 and the region near the inner wall of the corresponding grinding cavity 221 to continue grinding and crushing.

If the larger material particles a are broken into smaller material particles B after passing through the counter channel 13 of one impeller 1 and the corresponding area near the inner wall of the grinding chamber 221. The smaller material particles B move inwardly to approach the main shaft 500 and, after reaching the region near the main shaft 500, move rearwardly through the forward channel 12 of the impeller 1.

Here, the material circulation path occurring in the vicinity of the impeller 1 of the above-described circulating grinding mechanism 700 is referred to as a small circulation path of the circulating grinding mechanism 700.

After the ground material slurry and the grinding beads enter the separating mechanism 600, the larger material particles a and the grinding beads are rapidly separated to the area outside the separating mechanism 600 near the inner wall of the grinding chamber 221 under the action of the first separating turbine 610 and the second separating turbine 620 of the separating mechanism 600.

The separated larger material particles a and the grinding beads can be further crushed and ground under the interaction of the pin blocks 6112 on the cylindrical part 611 of the first separation turbine 610 and the bumps 230 on the inner wall of the grinding cavity 221. The smaller material particles B formed by grinding are re-introduced into the separating mechanism 600 from the front side region of the separating mechanism 600 under the action of the rotating flow field and the pumping action of the inclined through holes 6122 on the disk portion 612 of the first separating turbine 610.

Here, the material circulation path occurring in the vicinity of the above-described separation mechanism 600 is referred to as a small circulation path of the separation mechanism 600.

Referring to fig. 20, if the larger material particles a are not ground into smaller material particles B between the pin blocks 6112 on the cylindrical portion 611 of the first separation turbine 610 and the inner wall of the grinding chamber 221, the larger material particles a continue to move forward to the circulating grinding mechanism 700 for further grinding under the pumping action of the inclined surfaces of the pin blocks 6112 and the pumping action of the obliquely arranged reverse channels 13 on the impeller 1 of the front circulating grinding mechanism 700.

Here, the material circulation path occurring between the separation mechanism 600 and the circulating grinding mechanism 700 is referred to as a large circulation path.

In actual operation, a large circulation path between the separation mechanism 600 and the circulating grinding mechanism 700, a small circulation path of the separation mechanism 600, and a small circulation path of the circulating grinding mechanism 700 are simultaneously present and occur.

In the separation mechanism 600, the smaller material particles B pass through the discharge pipe network 630 and the through holes 520 formed in the main shaft 500 to enter the material output channel 510 in the main shaft 500 under the action of the rotating flow field, and then are output out of the grinding chamber 221.

In the above embodiments, the structural scheme and the operation principle of the circulating grinding mechanism 700 of the sander are not limited or dependent on the structural scheme and the operation principle of the separation mechanism 600 in the embodiments, and the separation mechanism 600 with different principles but the same function is replaced, and the circulating grinding mechanism 700 of the sander of the present invention can still realize the circulating grinding function.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A circulating grinding mechanism of a sand mill, comprising:

the impeller is provided with a forward channel obliquely penetrating through the impeller and a reverse channel obliquely penetrating through the impeller;

the inclination direction of the forward channel can ensure that the material moves forward when the impeller rotates along with the main shaft; the forward channel is close to the shaft hole of the impeller;

the inclination direction of the reverse channel can enable the impeller to rotate along with the main shaft, so that the material moves reversely; the reverse channel is far away from the shaft hole of the impeller.

2. A circulating grinding mechanism for a sander according to claim 1, wherein the reverse channel is a notch cut into the peripheral edge of the impeller.

3. A circulating grinding mechanism for a sander according to claim 1, wherein said reverse path is plural and is distributed around the peripheral edge of said impeller.

4. A circulating grinding mechanism for a sander according to claim 1, wherein the forward passage is a through-hole opening in the impeller.

5. A circulating grinding mechanism for a sander as set forth in claim 1, wherein said forward passages are plural and distributed around said axial bore.

6. The endless grinding mechanism of a sander as set forth in claim 1, further comprising a spacer;

the plurality of impellers are arranged on the main shaft in parallel;

the spacer bush is sleeved on the main shaft and positioned between two adjacent impellers.

7. A sander comprising a spindle, a separating mechanism and a circulating grinding mechanism of the sander of any one of claims 1 to 6;

the circulating grinding mechanism of the sand mill is arranged on the main shaft and is used for circularly grinding larger material particles in the material along with the rotation of the main shaft;

the separation mechanism is mounted on the main shaft and used for separating larger material particles and smaller material particles in the material so as to supply the larger material particles to the circulating grinding mechanism of the sand mill for circulating grinding.

8. A sand mill according to claim 7,

a material output channel is formed in the main shaft, and a through hole communicated with the material output channel and the outer space of the main shaft is formed in the circumferential wall of the main shaft, so that the small material particles separated by the separating mechanism are output to the sand mill.

9. The sander of claim 7, further comprising:

the cylinder barrel is internally provided with a grinding cavity, and the inner wall of the grinding cavity is fixedly provided with a convex block protruding inwards.

10. A sander as set forth in claim 9, wherein said nubs have a sloped ramp.

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