Circulation grinding mechanism of sand mill and sand mill

Abstract

The present invention provides a circulating grinding mechanism of a sand mill and a sand mill; wherein the circulating grinding mechanism of the sand mill comprises an impeller; the impeller is provided with a forward channel and a reverse channel obliquely penetrating the impeller; the inclination direction of the forward channel can make the material move forward when the impeller rotates with the main shaft; the forward channel is close to the axial hole of the impeller; the inclination direction of the reverse channel can make the material move reversely when the impeller rotates with the main shaft; the reverse channel is far away from the axial hole of the impeller. The circulating grinding mechanism of the sand mill of the present invention is provided with a forward channel obliquely penetrating the impeller near the axial hole on the impeller, and a reverse channel obliquely penetrating the impeller near the outer peripheral edge of the impeller, so that larger material particles move reversely and forward and are cyclically ground into smaller material particles, thereby solving the problems of grinding bead accumulation, discharging screen blockage, increased working temperature, and uneven coarseness of ground product particles in the sand mill.

Description

Technical Field

[0001] 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 Art

[0002] In the relevant scheme, the grinding method adopted by the sand mill is that the material is ground by the grinding mechanism and reaches the separation net at the rear end, and the ground material and grinding beads are separated by the separation net before the material is output. This scheme will cause problems such as accumulation of grinding beads, blocking of the net at the discharge, temperature rise, and uneven coarseness and fineness of the product particles.

[0003] Therefore, it is necessary to design a grinding mechanism for a sand mill to grind larger material particles in the grinding chamber into more uniform smaller material particles, thereby avoiding the above problems such as bead accumulation, material blockage, and temperature increase. Summary of the invention

[0004] In order to solve the problems of bead accumulation, discharging blockage, temperature rise, uneven product particle size and the like in the above-mentioned related solutions, the present invention provides a circulating grinding mechanism of a sand mill capable of grinding smaller material particles that are more uniform.

[0005] A circulating grinding mechanism of a sand mill comprises an impeller;

[0006] The impeller is provided with a forward channel obliquely penetrating the impeller and a reverse channel obliquely penetrating the impeller;

[0007] The inclination direction of the forward channel can make the material move in the forward direction when the impeller rotates with the main shaft; the forward channel is close to the shaft hole of the impeller;

[0008] The inclination direction of the reverse channel can make the material move in the reverse direction when the impeller rotates with the main shaft; the reverse channel is far away from the shaft hole of the impeller.

[0009] Furthermore, the reverse channel is a notch opened on the outer peripheral edge of the impeller.

[0010] Furthermore, there are multiple reverse channels distributed on the outer peripheral edge of the impeller.

[0011] Furthermore, the forward channel is a through hole opened on the impeller.

[0012] Furthermore, there are multiple forward channels distributed around the axial hole.

[0013] Furthermore, the circulating grinding mechanism of the sand mill further includes a spacer sleeve;

[0014] There are multiple impellers, which are arranged in parallel on the main shaft;

[0015] The spacer is sleeved on the main shaft and located between two adjacent impellers.

[0016] The present invention also provides a sand mill, comprising a main shaft, a separation mechanism and the circulating grinding mechanism of any one of the sand mills described above;

[0017] The circulating grinding mechanism of the sand mill is installed on the main shaft, and is used for circulating grinding of larger material particles in the material as the main shaft rotates;

[0018] The separation mechanism is installed on the main shaft and is used to separate larger material particles from 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.

[0019] Furthermore, a material output channel is provided in the main shaft, and a through hole connecting the material output channel and an external space of the main shaft is provided on the circumferential wall of the main shaft, so as to output the smaller material particles separated by the separation mechanism to the sand mill.

[0020] Furthermore, the sand mill further comprises:

[0021] The cylinder has a grinding chamber inside, and a convex block protruding inwards is fixed on the inner wall of the grinding chamber.

[0022] Furthermore, the protrusion has an inclined slope.

[0023] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0024] The present invention provides a circulating grinding mechanism for a sand mill, which has a forward channel obliquely penetrating the impeller near the shaft hole of the impeller, and a reverse channel obliquely penetrating the impeller at a position away from the shaft hole of the impeller, so that larger material particles move reversely and forward and are cyclically ground into smaller material particles, thereby solving the problems of bead accumulation, screen blockage at the discharge, increased working temperature, and uneven coarseness of the ground product particles in the sand mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of a circulating grinding mechanism arranged on a main shaft in one embodiment of the present invention.

[0026] Figure 2 It is a schematic diagram of the main structure of the impeller in one embodiment of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of an impeller in one embodiment of the present invention.

[0028] Figure 4 It is a schematic diagram of the distribution of particles in a high-speed rotating flow field.

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of a sand mill in one embodiment of the present invention.

[0030] Figure 6 It is a schematic diagram of the structure in which a circulating grinding mechanism and a separating mechanism are arranged in a cylinder barrel in one embodiment of the present invention.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of a cylinder in one embodiment of the present invention.

[0032] Figure 8 It is a schematic diagram of the cross-sectional structure of the cylinder inner liner along its axial direction in one embodiment of the present invention.

[0033] Fig. 9 It is a schematic diagram of a partial three-dimensional structure of a main shaft in one embodiment of the present invention.

[0034] Fig.10 It is a schematic diagram of the local cross-sectional structure of the main shaft along its axial direction in one embodiment of the present invention.

[0035] Fig.11 It is a schematic diagram of the internal structure of the separation mechanism after the outer pressure cover is removed in one embodiment of the present invention.

[0036] Fig.12 It is a schematic diagram of the three-dimensional structure of the appearance of the separation mechanism in one embodiment of the present invention.

[0037] Fig.13 It is a schematic diagram of the three-dimensional structure of the appearance of the first separation turbine in one embodiment of the present invention.

[0038] Fig.14 It is a schematic diagram of the cross-sectional structure of the cylindrical portion along a direction perpendicular to its axial direction in one embodiment of the present invention.

[0039] Fig.15 It is a schematic diagram of the rear structural view of the first separation turbine in one embodiment of the present invention.

[0040] Fig.16 It is a schematic diagram of the three-dimensional structure of the appearance of the second separation turbine in one embodiment of the present invention.

[0041] Fig.17 It is a schematic diagram of the cross-sectional structure of the second separation turbine along a direction perpendicular to its axial direction in one embodiment of the present invention.

[0042] Fig.18 It is a schematic diagram of the three-dimensional structure of the discharge pipe network in one embodiment of the present invention.

[0043] Fig.19 It is a schematic diagram of the small circulation path of the material at the circulation grinding mechanism and the small circulation path at the separation mechanism in one embodiment of the present invention.

[0044] Fig. 20 It is a schematic diagram of the large circulation path of materials between the circulation grinding mechanism and the separation mechanism in one embodiment of the present invention.

[0045] The following are the descriptions of the reference numerals:

[0046] 1. Impeller; 11. Shaft hole; 12. Forward channel; 13. Reverse channel; 14. Pin block-shaped protrusion;

[0047] 2. Spacer;

[0048] 100, rack; 110, guide rail;

[0049] 200, cylinder barrel; 210, cylinder barrel jacket; 220, cylinder barrel liner; 221, grinding chamber; 230, bump; 240, bracket; 250, guide wheel; 260, feed pipe; 270, discharge pipe;

[0050] 300, motor;

[0051] 400, transmission mechanism;

[0052] 500, spindle; 510, material output channel; 520, via hole;

[0053] 600, separation mechanism; 610, first separation turbine; 611, cylindrical portion; 6111, first separation hole; 6112, pin block; 612, disc portion; 6121, mounting hole; 6122, through hole; 620, second separation turbine; 621, second separation hole; 630, discharge pipe network; 631, grid; 632, separation net; 640, outer gland;

[0054] 700, Circulation grinding mechanism;

[0055] 800. Cooling system. DETAILED DESCRIPTION

[0056] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of the present invention, the direction in which the material moves in the grinding chamber of the sand mill along the axis of the main shaft and toward the separation net is called backward, and the direction opposite to backward is called forward. When viewed from the front to the back, the left side is defined as left, and the right side is defined as right.

[0060] In the related scheme, a grinding mechanism and a separation net are provided in the grinding chamber of the horizontal sand mill. The material slurry in the grinding chamber is ground by the grinding mechanism and reaches the separation net at the rear end together with the grinding beads. The separation net separates the grinding beads in the slurry and outputs the ground material product.

[0061] In actual use, due to the uneven coarseness of the ground material products, it is easy to cause blockage of the separation screen and accumulation of grinding beads, which in turn leads to problems such as increased equipment temperature.

[0062] Reference Figure 1 An embodiment of the present invention provides a circulating grinding mechanism of a sand mill, comprising an impeller 1 and a spacer sleeve 2.

[0063] Reference Figure 2 and Figure 3The impeller 1 is provided with an axial hole 11 so that the impeller 1 can be mounted on the main shaft of the sand mill. A keyway can be provided on the inner wall of the axial hole 11 of the impeller 1 so that the impeller 1 and the main shaft can form a key connection, thereby making the impeller 1 rotate with the rotation of the main shaft to stir the grinding beads and the material slurry to move and grind the material.

[0064] In some embodiments, the impeller 1 is provided with a forward channel 12 and a reverse channel 13 obliquely penetrating the impeller 1. That is, the extension direction of the forward channel 12 and the extension direction of the reverse channel 13 are different from the extension direction of the shaft hole 11 of the impeller 1, so that the extension direction of the forward channel 12 and the extension direction of the reverse channel 13 have a certain angle with the axis direction of the main shaft. When the impeller 1 rotates with the main shaft, the material and grinding beads passing through the forward channel 12 and the reverse channel 13 can be pushed forward or backward.

[0065] 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 grinding beads passing through the forward channel 12 can be pushed to move backward, and the material and grinding beads passing through the reverse channel 13 can be pushed to move forward.

[0066] Specifically, the forward channel 12 can be opened near the shaft hole 11 close to the impeller 1. A plurality of forward channels 12 can be opened around the shaft hole 11, so that when the main shaft of the sand mill rotates, the material slurry and grinding beads in the grinding chamber can flow from front to back in the surrounding area near the main shaft and grind the material.

[0067] The reverse channel 13 is far away from the shaft hole 11 of the impeller 1. For example, the reverse channel 13 can be opened near the outer peripheral edge of the impeller 1. A plurality of reverse channels 13 can be distributed along the outer peripheral edge area of ​​the wheel, so that when the impeller 1 rotates with the main shaft, the larger material particles in the grinding chamber can flow reversely from back to front in the edge area close to the impeller 1 (that is, the area in the grinding chamber away from the main shaft), and then further grind in the process of flow. After the larger material particles flow in reverse and reach the front of the impeller 1, they can enter the forward channel 12 again, flow from front to back and grind again.

[0068] It can be understood that in this embodiment, the number, structural form, etc. of the forward channel 12 and the reverse channel 13 can be set according to actual needs. As long as it complies with the principles of the above scheme, the technical effect can be achieved to a certain extent.

[0069] In some embodiments, the reverse channel 13 is a notch obliquely opened at the outer peripheral edge of the impeller 1, so that the reverse channel 13 is in the shape of an inclined groove, which not only reduces the overall weight of the impeller 1, but also increases the space for the reverse flow of materials.

[0070] The protruding edge of the impeller 1 is pin-block shaped, and the protruding portion is referred to as the pin-block shaped protruding portion 14. During the rotation of the impeller 1, the moving pin-block shaped protruding portion 14 and the fixed parts in the grinding chamber can generate a large relative movement, thereby increasing the grinding of the material particles.

[0071] The impeller 1 in the above embodiment may also have other various deformation structures, but as long as they are based on the same structural principle as the solution of the present invention and achieve the same technical effect, they are within the protection scope of the present invention.

[0072] In some embodiments, the circulating grinding mechanism includes a plurality of impellers 1. The plurality of impellers 1 are installed on the main shaft in an interval arrangement from front to back according to the above installation method, so that the material flowing in the forward or reverse direction can be ground multiple times. The number of impellers 1 can be set according to actual needs.

[0073] It can be understood that only one impeller 1 meeting the above structural characteristics can also achieve the technical effect of cyclic grinding to a certain extent.

[0074] Reference Figure 4 In a circular high-speed rotating flow field, the distribution law of particles is: from the center of the circle to the largest diameter, the particle size gradually increases from the smallest to the largest. That is, the smaller the particle size, the closer it is to the center of the circle, and the larger the particle size, the closer it is to the edge.

[0075] Similarly, in the high-speed rotating flow field formed in the grinding chamber, the larger the grinding beads are, the farther they are from the main axis, and the smaller the grinding beads are, the closer they are to the main axis. The farther they are from the main axis, the greater the density distribution of the grinding beads; the closer they are to the main axis, the smaller the density distribution of the grinding beads.

[0076] In the rotating flow field formed in the grinding chamber, the farther away from the main axis, the greater the linear speed of rotation, and thus the greater the grinding intensity of the material particles; the closer to the main axis, the smaller the linear speed of rotation, and the smaller the grinding intensity of the material particles.

[0077] The notch (reverse channel 13) on the edge of the impeller 1 is inclined, and the rotation can generate a backward thrust, so that the fluid (including material particles and grinding beads) in the inner and outer layers of the grinding chamber circulates back (i.e., reversely), and the grinding time in the grinding chamber is prolonged. By repeating this cycle, larger material particles will be quickly ground.

[0078] The oblique hole (positive channel 12) around the impeller 1 near the shaft hole 11 is closest to the main shaft and is also the place where the smallest particles are concentrated. When the impeller 1 rotates, the oblique hole (positive channel 12) exerts a positive push on the slurry, pushing the smallest particles in the grinding chamber to the separation mechanism, so that the smallest particles in the grinding chamber are quickly discharged from the grinding chamber, so that the small particles will not be over-grinded (over-grinding is not good either, over-grinding means being ground too small).

[0079] The speed at which small particles become smaller is also relatively slow. The time that small particles stay in the grinding chamber is very short, and the time they are ground is also very short, which consumes less energy and can save electricity.

[0080] After such repeated grinding cycles, larger material particles are quickly ground into smaller material particles, while smaller material particles become smaller more slowly. The final product particle size is very uniform and the particle size distribution range is very narrow, which is the ideal result pursued in powder preparation.

[0081] Large particles take a long time to grind, so power (electricity) is mainly used for effective grinding of large particles, which greatly improves grinding efficiency and product quality while achieving energy conservation and environmental protection.

[0082] The spacer 2 is sleeved on the main shaft, and the spacer 2 and the impeller 1 are alternately arranged to separate two adjacent impellers 1 by a certain distance. The diameter of the spacer 2 is larger than the diameter of the shaft hole 11 of the impeller 1 and smaller than the distance from the forward channel 12 to the axial center line of the shaft hole 11, so as to avoid affecting the flow of materials through the forward channel 12 on the impeller 1.

[0083] Reference Figure 5 and Figure 6 The present invention further provides a sand mill, which includes a frame 100, a cylinder 200, a motor 300, a transmission mechanism 400, a main shaft 500, a separation mechanism 600, and the circulation grinding mechanism 700 in the above embodiment.

[0084] The frame 100 is a carrier for installing other components of the sand mill. In some embodiments, the frame 100 is provided with a guide rail 110 along the front-rear direction to facilitate the installation or removal of the cylinder barrel 200.

[0085] Reference Figure 7 The cylinder 200 is mounted on the frame 100 . The cylinder 200 includes a cylinder outer sleeve 210 and a cylinder liner 220 , and the cylinder outer sleeve 210 is sleeved outside the cylinder liner 220 .

[0086] The cylinder jacket 210 supports and protects the cylinder liner 220 . If the requirements are not too strict, the cylinder jacket 210 may not be provided, or the cylinder jacket 210 and the cylinder liner 220 may be designed as an integrated cylinder 200 .

[0087] The inner cavity of the cylinder liner 220 is the grinding chamber 221. The grinding chamber 221 can accommodate the separation mechanism 600 and the circulation grinding mechanism 700, which operate in the grinding chamber 221 to drive the material slurry and grinding beads in the grinding chamber 221 to move, thereby grinding the material in the grinding chamber 221.

[0088] A plurality of inwardly protruding convex blocks 230 are fixedly arranged on the inner wall of the grinding chamber 221. The convex blocks 230 fixed on the inner wall of the grinding chamber 221 interact with the pin blocks on the separation mechanism 600 and the pin block-shaped protruding portions 14 on the circulating grinding mechanism 700, thereby driving the grinding beads to generate a larger relative motion, thereby improving the grinding effect on the material.

[0089] Reference Figure 8 In some embodiments, the projection 230 has an inclined surface. The inclined direction of the inclined surface on the projection 230 is consistent with the inclined direction of the reverse channel 13 on the circulating grinding mechanism 700 and the inclined direction of the inclined surface of the pin block on the separation mechanism 600. The projection 230 with an inclined surface has the function of pushing the larger material particles and grinding beads in the outer layer to circulate back, thereby increasing the grinding time of the larger material particles in the grinding chamber 221.

[0090] Specifically, the protrusion 230 may be a block structure with uniform thickness, and the protrusion 230 may be inclined to form an inclined surface. According to actual needs, the inclination angle of the inclined surface may be selected and set within a range of 10° to 20°.

[0091] The front and rear ends of the cylinder 200 are both provided with sealing covers. After the sand mill is assembled, the grinding chamber 221 in the cylinder 200 is sealed except that the material and medium inlet and outlet such as the feed pipe, the discharge pipe and the bead adding port are connected with the grinding chamber 221 in the cylinder 200 as necessary.

[0092] The cylinder barrel 200 is fixed on the bracket 240, and a guide wheel 250 is installed at the bottom of the bracket 240, and the guide wheel 250 can roll on the guide rail 110 of the frame 100. Furthermore, through the arrangement of the guide rail 110 and the guide wheel 250, the cylinder barrel 200 can be translated on the frame 100, so as to facilitate the installation and removal of the cylinder barrel 200, and facilitate the maintenance and assembly of the sand mill.

[0093] The motor 300 is fixed on the frame 100, and the motor 300 is connected to 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 install and drive the separation mechanism 600 and the circulation grinding mechanism 700.

[0094] Reference Fig. 9 and Fig.10 In some embodiments, a material output channel 510 is provided in the main shaft 500. For example, the main shaft 500 may be a hollow shaft, and the cavity in the hollow shaft may serve as the material output channel 510. A through hole 520 is provided on the circumferential wall of the main shaft 500 to connect the material output channel 510 and the external space of the main shaft 500, and the smaller material particles separated by the separation mechanism 600 may flow into the material output channel 510 along with the slurry through the through hole 520.

[0095] The material output channel 510 in the main shaft 500 can be designed to be blocked at the rear end and unblocked at the front end, that is, the output smaller material particles can flow from the back to the front with the slurry in the main shaft 500. The front end of the material output channel 510 is connected to the discharge pipe 270 provided at the front side of the sand mill, and the material product obtained by grinding can be output from the discharge pipe 270 to the outside of the sand mill.

[0096] Reference Fig.11 and Fig.12 In some embodiments, the separation mechanism 600 includes a first separation turbine 610 , a second separation turbine 620 , a discharge pipe network 630 and an outer pressure cover 640 .

[0097] Reference Fig.13 , Fig.14 and Fig.15 The first separation turbine 610 includes a cylindrical portion 611 and a disk portion 612 .

[0098] The cylindrical portion 611 is cylindrical with a cavity inside, and a first separation hole 6111 is opened on the cylindrical wall of the cylindrical portion 611. The first separation hole 6111 obliquely penetrates the cylindrical wall of the cylindrical portion 611, so that the first separation hole 6111 can connect the spaces on both sides of the cylindrical wall of the cylindrical portion 611, so that the larger material particles and grinding beads in the cylindrical portion 611 can flow out of the cylindrical portion 611 with the slurry through the first separation hole 6111.

[0099] The first separation hole 6111 obliquely penetrates the wall of the cylindrical portion 611, which means that the penetration direction of the first separation hole 6111 is not along the radial direction of the cylindrical portion 611, but has a certain angle with the radial direction of the cylindrical portion 611. The angle enables the inner wall of the inclined first separation hole 6111 to act like a turbine blade when the cylindrical portion 611 rotates around the main axis 500, and can throw larger material particles and grinding beads out of the cylindrical portion 611 along with the slurry, thereby achieving the separation function of larger particles (including larger material particles and grinding beads) and smaller material particles.

[0100] The first separation hole 6111 may be a strip hole whose length direction is parallel to the axial direction of the cylindrical portion 611. A plurality of first separation holes 6111 may be evenly distributed on the cylinder wall of the cylindrical portion 611, so that the first cylinder wall is in a hollow state, which not only effectively reduces the weight of the first separation turbine 610, but also enables the separation flow of materials to be smoother and more efficient.

[0101] In some embodiments, a pin block 6112 is fixed to the outer side of the cylindrical 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 with the cylindrical portion 611, the inclined surface facing the rotation direction can be like an inclined blade, and the separated larger material particles together with the grinding beads and the slurry can be transported to the front circulating grinding mechanism 700, so that the larger material particles can be ground again at the circulating grinding mechanism 700.

[0102] Specifically, a plurality of pin blocks 6112 can be arranged to avoid the first separation hole 6111, thereby improving the efficiency and effect of conveying materials. The pin block 6112 protruding from the wall of the cylindrical portion 611 can also generate a large relative movement with the protrusion 230 fixed on the inner wall of the grinding chamber 221 when rotating, thereby driving the grinding beads to violently collide and squeeze each other, thereby improving the grinding effect of the material in the slurry.

[0103] The disc-shaped portion 612 is fixed to one end of the cylindrical portion 611, so that the first separation turbine 610 is in the shape of a barrel with an opening at one end. The disc-shaped portion 612 and the cylindrical portion 611 can be integrally formed. When installed in the sand mill, the end where the disc-shaped portion 612 is fixed is close to the circulation grinding mechanism 700.

[0104] The disc-shaped portion 612 is provided with a mounting hole 6121 matching the main shaft 500. Through the matching and key connection between the mounting hole 6121 and the main shaft 500, the first separation turbine 610 can be mounted on the main shaft 500 and driven by the main shaft 500 to operate.

[0105] The disc-shaped portion 612 is provided with an inclined through hole 6122 like the forward channel 12 on the impeller 1. When the disc-shaped portion 612 rotates with the main shaft 500, the inner wall of the inclined through hole 6122 can transport material particles and grinding beads along with the slurry into the internal cavity of the cylindrical portion 611 like an inclined blade.

[0106] In some embodiments, the first separation turbine 610 may not be provided with the disk-shaped portion 612 , but may be supported and driven by other components.

[0107] For example, one end of the cylindrical portion 611 can be directly fixed to the impeller 1 of the front circulating grinding mechanism 700. Thus, the impeller 1 replaces the function of the disc portion 612, which can not only support the cylindrical portion 611 and drive the cylindrical portion 611 to rotate, but also can transport the ground materials into the cylindrical portion 611.

[0108] Other components may also be provided to mount and support the cylindrical portion 611 on the main shaft 500 , and the inertia of the material etc. after being ground by the circulating grinding mechanism 700 moving backwards is utilized to allow the material etc. to enter the cylindrical portion 611 .

[0109] In some embodiments, the disc-shaped portion 612 may only serve to install, support and drive the cylindrical portion 611 on the main shaft 500 .

[0110] For example, the disc-shaped portion 612 may be a wheel-shaped portion with spokes, or a hollow disc-shaped portion, without the inclined through-hole 6122. The material etc. enters the cylindrical portion 611 by the inertia of backward movement or by the conveying action of other mechanisms.

[0111] In some embodiments, the disc-shaped portion 612 may also be provided separately from the cylindrical portion 611 .

[0112] In this case, the disc-shaped portion 612 no longer plays a role in installing and supporting the cylindrical portion 611, and cannot drive the cylindrical portion 611 to rotate. The cylindrical portion 611 relies on other components to achieve installation, support and driving. However, the through hole 6122 obliquely opened on the disc-shaped portion 612 can still independently realize the function of conveying materials in the cylindrical portion 611.

[0113] Reference Fig.16 and Fig.17 The second separation turbine 620 is in the shape of a cylinder with a cavity inside, and is sleeved in the cavity of the first separation turbine 610 and is coaxial with the cylindrical portion 611 of the first separation turbine 610, thereby forming a two-stage separation mechanism.

[0114] A second separation hole 621 is formed on the cylinder wall of the second separation turbine 620 . The second separation hole 621 obliquely penetrates the cylinder wall of the second separation turbine 620 , thereby connecting the spaces inside and outside the second separation turbine 620 .

[0115] The inclination direction of the second separation hole 621 is consistent with the inclination direction of the first separation hole 6111 on the cylindrical portion 611. The second separation hole 621 can be a strip hole whose length direction is parallel to the axial direction of the second separation turbine 620. A plurality of second separation holes 621 can be evenly distributed on the cylinder wall of the second separation turbine 620, so that the cylinder wall of the second separation turbine 620 is hollowed out, which not only effectively reduces the weight of the second separation turbine 620, but also enables the separation flow of materials to be smoother and more efficient.

[0116] The outer side surface of the cylinder wall of the second separation turbine 620 is spaced a certain distance from the inner side surface of the cylinder wall of the cylindrical portion 611 of the first separation turbine 610. Thus, sufficient separation space and time are provided to make the separation more thorough.

[0117] The front end of the second separation turbine 620 is detachably fixed to the disk-shaped portion 612 of the first separation turbine 610 , so that the second separation turbine 620 is supported and driven by the disk-shaped portion 612 of the first separation turbine 610 .

[0118] The radius of the second separation turbine 620 is smaller than the distance from the through hole 6122 on the disc-shaped portion 612 to the axis of the first separation 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 material 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.

[0119] After the material slurry and grinding beads enter the first separation turbine 610 through the through hole 6122, some grinding beads and material particles that are obviously too large may first pass through the first separation hole 6111 opened in the cylindrical portion 611 under the action of centrifugal force and be thrown out of the first separation turbine 610.

[0120] The second largest material particles, although smaller than the obviously oversized material particles, are still larger than the smaller material particles. Due to the pumping action of the second separation turbine 620 and the centrifugal force of the second largest material particles and the grinding beads, the second largest material particles and the grinding beads cannot pass through the second separation hole 621 and enter the second separation turbine 620.

[0121] These second largest material particles and the remaining grinding beads will eventually be thrown out of the first separation turbine 610 through the first separation hole 6111 opened in the cylindrical portion 611 under the action of centrifugal force, the pumping action of the second separation turbine 620 and the pumping action of the first separation turbine 610.

[0122] Smaller material particles can enter the second separation turbine 620 along with the slurry through the second separation hole 621 opened on the second separation turbine 620, and then pass through the discharge pipe network 3 arranged in the second separation turbine 620 to enter the material output channel and output the sand mill.

[0123] Therefore, not only the function of graded separation of material particles is achieved, so that the material separation effect is better, but also the grinding beads are prevented from contacting the discharge pipe network 3 and wearing the discharge pipe network 3 during the working process.

[0124] After the sand mill is stopped, the first separation turbine 610 and the second separation turbine 620 no longer rotate, and the larger material particles and grinding beads in the slurry lose centrifugal force, and there is no longer any pumping and pushing effect of the first separation turbine 610 and the second separation turbine 620. The larger material particles and 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 cannot pass through the discharge pipe network 3 to enter the material output channel.

[0125] Once the sand mill is started, the first separation turbine 610 and the second separation turbine 620 begin to operate, and the larger material particles and grinding beads in the second separation turbine 620 will be 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 reach the outside of the first separation turbine 610 through the pumping action of the first separation turbine 610 to achieve the separation effect.

[0126] Reference Fig.18 The discharge pipe network 630 is sleeved on the main shaft 500 and is located in the cavity of the second separation turbine 620 to cover the through hole 520 on the main shaft 500 and prevent the unseparated grinding beads from entering the material output channel 510.

[0127] When 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 .

[0128] The front end of the discharge pipe network 630 is detachably fixed to the disc-shaped portion 612 , so that the discharge pipe network 630 obtains installation support.

[0129] The discharge pipe network 630 includes a grid frame 631 and a separation net 632. The separation net 632 is fixed on the grid frame 631 to form a tubular discharge pipe network 630 to cover the through hole 520 opened on the main shaft 500.

[0130] The outer pressure cover 640 is detachably fixed to the rear end of the main shaft 500 by screws, and is used to detachably fix 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 .

[0131] The sand mill provided by the present invention is also provided with a cooling system 800 for dissipating heat and cooling the shaft seal of the main shaft 500 during operation.

[0132] In summary, a specific working process of the sand mill and the circulating grinding mechanism 700 of the sand mill of the present invention is as follows:

[0133] After the sand mill is started, the main shaft 500 drives the circulating grinding mechanism 700 and the separation mechanism 600 to operate. The material slurry to be ground enters the cylinder 200 from the feed pipe 260 arranged at the front side of the cylinder 200, that is, enters the grinding chamber 221.

[0134] The material slurry is mixed with the grinding beads in the grinding chamber 221 under the stirring of the circulating grinding mechanism 700. The material slurry mixed with the grinding beads passes through the forward channel 12 on the impeller 1 from the area near the main shaft 500, and continues to flow backward under the pumping action of the forward channel 12.

[0135] Under the stirring action of the impeller 1 and the backward flow of the slurry, the grinding beads in the slurry continuously collide, rub and squeeze each other, thereby crushing and shearing the material particles in the slurry, breaking the larger material particles in the slurry into smaller ones.

[0136] Under the rotation of the multiple impellers 1, the material particles in the slurry are continuously broken. As the slurry flows backward, the larger material particles therein are continuously reduced, while the smaller material particles are continuously increased. The slurry finally flows into the separation mechanism 600, which separates the smaller material particles and outputs them to the sand mill through the material output channel 510, and re-transmits the larger material particles and grinding beads to the circulation grinding mechanism 700 for further grinding.

[0137] In the rotating flow field, there is a certain tendency that small particles move inwards and large particles move outwards. The following uses A to represent the movement path of larger material particles and B to represent the movement path of smaller material particles to describe the movement path and change process of the material.

[0138] Reference Fig.19 Due to the pumping action of the forward channel 12 on the impeller 1, the material entering the grinding chamber 221 gradually passes through the forward channels 12 of all impellers 1 from front to back and enters the separation mechanism 600, and the larger material particles A in the slurry are also continuously broken into smaller material particles B during movement.

[0139] Every time the slurry passes through the forward channel 12 of the impeller 1, the material particles therein will be broken once. In most cases, the material particles passing through the forward channel 12 of the impeller 1 are in a mixed state of larger material particles A and smaller material particles B.

[0140] Under the action of the rotating flow field, some larger material particles A move outward and away from the main shaft 500, and then reach the vicinity of the reverse channel 13 of the impeller 1. Under the pumping action of the reverse channel 13, they move forward along the area near the inner wall of the grinding chamber 221 and are crushed again in the process. The smaller material particles B pass through the forward channel 12 of the previous impeller 1 and continue to move backward along the area near the main shaft 500.

[0141] If the larger material particles A are not crushed into smaller material particles B after passing through the reverse channel 13 of an impeller 1 and the area near the inner wall of the grinding chamber 221 corresponding to the impeller 1, they 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 area near the inner wall of the corresponding grinding chamber 221 to continue grinding and crushing.

[0142] If the larger material particles A are crushed into smaller material particles B after passing through the reverse channel 13 of an impeller 1 and the area near the inner wall of the corresponding grinding chamber 221, the smaller material particles B will move inward to approach the main shaft 500, and after reaching the area near the main shaft 500, they will move backward through the forward channel 12 of the impeller 1.

[0143] Here, the material circulation path occurring in the vicinity of the impeller 1 of the circulation grinding mechanism 700 is referred to as a small circulation path of the circulation grinding mechanism 700 .

[0144] After the ground material slurry and grinding beads enter the separation mechanism 600, under the action of the first separation turbine 610 and the second separation turbine 620 of the separation mechanism 600, the larger material particles A and grinding beads are quickly separated to the area outside the separation mechanism 600 near the inner wall of the grinding chamber 221.

[0145] The separated larger material particles A and grinding beads can be further crushed and ground under the interaction of the pin block 6112 on the cylindrical portion 611 of the first separation turbine 610 and the protrusion 230 on the inner wall of the grinding chamber 221. The smaller material particles B formed by grinding enter the separation mechanism 600 again from the front area of ​​the separation mechanism 600 under the action of the rotating flow field and the pumping action of the obliquely opened through hole 6122 on the disc portion 612 of the first separation turbine 610.

[0146] Here, the material circulation path occurring in the vicinity of the separation mechanism 600 is referred to as a small circulation path of the separation mechanism 600 .

[0147] Reference Fig. 20 If the larger material particles A are not ground into smaller material particles B between the pin block 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 surface of the pin block 6112 and the pumping action of the inclined reverse channel 13 on the impeller 1 of the front circulating grinding mechanism 700.

[0148] Here, the material circulation path between the separation mechanism 600 and the circulation grinding mechanism 700 is referred to as a large circulation path.

[0149] In actual work, the large circulation path between the separation mechanism 600 and the circulation grinding mechanism 700, the small circulation path of the separation mechanism 600, and the small circulation path of the circulation grinding mechanism 700 exist and occur simultaneously.

[0150] In the separation mechanism 600 , smaller material particles B, under the action of the rotating flow field, pass through the discharge pipe network 630 and the through hole 520 opened on the main shaft 500 and enter the material output channel 510 in the main shaft 500 and then output out of the grinding chamber 221 .

[0151] In the above embodiments, the structural scheme and working principle of the circulating grinding mechanism 700 of the sand mill are not limited to or dependent on the structural scheme and working principle of the separation mechanism 600 in the embodiments. By replacing the separation mechanism 600 with a different principle but with the same function, the circulating grinding mechanism 700 of the sand mill of the present invention can still realize its circulating grinding function.

[0152] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the present invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A circulating grinding mechanism of a sand mill, characterized in that: include: An impeller is provided with a forward channel obliquely penetrating the impeller and a reverse channel obliquely penetrating the impeller; The inclination direction of the forward channel can make the material move in the forward direction when the impeller rotates with the main shaft; the forward channel is close to the shaft hole of the impeller; The inclination direction of the reverse channel can make the material move in the reverse direction when the impeller rotates with the main shaft; the reverse channel is away from the shaft hole of the impeller; There are multiple impellers, which are arranged in parallel on the main shaft; The spacer is sleeved on the main shaft and located between two adjacent impellers.

2. The circulating grinding mechanism of the sand mill according to claim 1, characterized in that: The reverse channel is a notch opened on the outer peripheral edge of the impeller.

3. The circulating grinding mechanism of the sand mill according to claim 1, characterized in that: There are multiple reverse channels distributed on the outer peripheral edge of the impeller.

4. The circulating grinding mechanism of the sand mill according to claim 1, characterized in that: The forward channel is a through hole opened on the impeller.

5. The circulating grinding mechanism of the sand mill according to claim 1, characterized in that: There are multiple forward channels distributed around the axial hole.

6. A sand mill, characterized in that: A circulating grinding mechanism comprising a main shaft, a separation mechanism and a sand mill according to any one of claims 1 to 5; The circulating grinding mechanism of the sand mill is installed on the main shaft, and is used for circulating grinding larger material particles in the material as the main shaft rotates; The separation mechanism is installed on the main shaft and is used to separate larger material particles from 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.

7. The sand mill according to claim 6, characterized in that: A material output channel is provided in the main shaft, and a through hole connecting the material output channel and an external space of the main shaft is provided on the circumferential wall of the main shaft, so as to output the smaller material particles separated by the separation mechanism to the sand mill.

8. The sand mill according to claim 6, characterized in that: Also includes: The cylinder has a grinding chamber inside, and a convex block protruding inwards is fixed on the inner wall of the grinding chamber.

9. The sand mill according to claim 8, characterized in that: The projection has an inclined slope.

Images