Separating mechanism for sand mill and sand mill

Abstract

The invention provides a separation mechanism for a sand mill and the sand mill. The separation mechanism for the sand mill comprises a first separation turbine and a second separation turbine, a first separation hole is obliquely formed in the first separation turbine; the second separation turbine is arranged in the cavity of the cylindrical part, and a second separation hole is obliquely formed in the second separation turbine. According to the separation mechanism for the sand mill, the second separation turbine is arranged in the first separation turbine, so that when the first separation turbine and the second separation turbine rotate along with the main shaft, the first separation turbine can convey larger material particles in the cylindrical part to the outside; and the second separation turbine can prevent larger material particles from entering the second separation turbine, so that the technical purpose of separating the larger material particles from smaller material particles in the grinding cavity is achieved, the net blockage caused by discharging is avoided, and the separated larger material particles can be further ground by the grinding mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of grinding equipment, in particular to a separation mechanism for 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 separation mechanism for a sand mill to separate larger material particles from smaller material particles in the grinding chamber, thereby outputting smaller material particles, while larger material particles can be further ground by the grinding mechanism to solve the above problems. Summary of the invention

[0004] In order to solve the problems in the above-mentioned related solutions caused by uneven coarseness and fineness of product particles and the inability to separate coarse and fine particles, the present invention provides a separation mechanism for a sand mill that can separate larger material particles from smaller material particles, so that the separated larger material particles can be supplied to a grinding mechanism for further grinding.

[0005] A separation mechanism for a sand mill, comprising a first separation turbine and a second separation turbine;

[0006] The first separation turbine comprises a cylindrical portion, the cylindrical portion is in a cylindrical shape with a cavity inside; a first separation hole is opened on the cylindrical wall of the cylindrical portion;

[0007] The first separation hole obliquely penetrates the cylindrical wall of the cylindrical portion to connect the spaces inside and outside the cylindrical portion, and when the cylindrical portion rotates with the main shaft, the larger material particles in the cylindrical portion are transported to the outside of the cylindrical portion;

[0008] The second separation turbine is in the shape of a cylinder with a cavity inside, is arranged in the cavity of the cylinder portion, and is spaced apart from the inner wall of the cylinder portion; a second separation hole is opened on the cylinder wall of the second separation turbine;

[0009] The second separation hole obliquely penetrates the cylinder wall of the second separation turbine to connect the spaces inside and outside the second separation turbine, and prevents larger material particles outside the second separation turbine from entering the second separation turbine when rotating with the main shaft.

[0010] Furthermore, a pin block is fixed to the outer side of the cylinder wall of the cylindrical portion;

[0011] The pin block is provided with an inclined surface, so that when the cylindrical part rotates, the pin block can drive the material to move toward the inner circulation mechanism of the sand mill.

[0012] Furthermore, there are a plurality of pin blocks distributed on the outer side of the cylinder wall of the cylindrical portion.

[0013] Further, the first separation turbine further includes a disc-shaped portion;

[0014] The disc-shaped portion is arranged at one end of the cylindrical portion, and a through hole is obliquely opened on the disc-shaped portion;

[0015] The inclined direction of the through hole enables the material to flow into the cavity of the cylindrical part through the through hole when the disc-shaped part rotates with the main shaft.

[0016] Further, a distance from the through hole to the axial center line of the first separation turbine is greater than a radius of the second separation turbine and smaller than a radius of the cavity in the cylindrical portion.

[0017] Further, the first separation turbine further includes a disc-shaped portion;

[0018] The disc-shaped portion is fixed to one end of the cylindrical portion, and a mounting hole capable of matching with the main shaft is opened on the disc-shaped portion so as to mount the first separation turbine on the main shaft.

[0019] Furthermore, there are a plurality of first separation holes distributed on the cylinder wall of the cylindrical portion.

[0020] Furthermore, the separation mechanism for the sand mill further comprises:

[0021] The material discharging pipe network is sleeved on the main shaft and located in the cavity of the cylindrical part to prevent the grinding beads from entering the material discharging channel on the main shaft.

[0022] Furthermore, the discharge pipe network includes a grid and a separation net; the separation net is fixed on the grid to form the tubular discharge pipe network.

[0023] The present invention also provides a sand mill, comprising a main shaft, a circulation mechanism and any one of the above separation mechanisms for the sand mill;

[0024] The circulation mechanism is installed on the main shaft and is used to cyclically grind larger material particles as the main shaft rotates;

[0025] The separation mechanism is installed on the main shaft and is used to separate larger material particles from smaller material particles, so as to supply the larger material particles to the circulation mechanism for circulation grinding.

[0026] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0027] The present invention provides a separation mechanism for a sand mill. By arranging a second separation turbine in a first separation turbine, when the first separation turbine and the second separation turbine rotate with the main shaft, the first separation turbine can transport larger material particles in the cylindrical part to the outside, and the second separation turbine can prevent larger material particles from entering the interior of the second separation turbine, thereby achieving the technical purpose of separating larger material particles from smaller material particles in the grinding chamber, avoiding clogging of the screen at the discharge, and the separated larger material particles can be provided for further grinding by the grinding mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 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.

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of the appearance of the separation mechanism in one embodiment of the present invention.

[0030] Figure 3 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.

[0031] Figure 4 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.

[0032] Figure 5 It is a schematic diagram of the rear structural view of the first separation turbine in one embodiment of the present invention.

[0033] Figure 6 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.

[0034] Figure 7 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.

[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the discharge pipe network in one embodiment of the present invention.

[0036] Fig. 9 It is a schematic diagram of the three-dimensional structure of a sand mill in one embodiment of the present invention.

[0037] Fig.10 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.

[0038] Fig.11 It is a schematic diagram of the three-dimensional structure of a cylinder in one embodiment of the present invention.

[0039] Fig.12 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.

[0040] Fig.13 It is a schematic diagram of a partial three-dimensional structure of a main shaft in one embodiment of the present invention.

[0041] Fig.14 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.

[0042] Fig.15 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.

[0043] Fig.16 It is a schematic diagram of the main structure of the impeller in one embodiment of the present invention.

[0044] Fig.17 It is a schematic diagram of the three-dimensional structure of an impeller in one embodiment of the present invention.

[0045] Fig.18 It is a schematic diagram of the distribution of particles in a high-speed rotating flow field.

[0046] 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.

[0047] 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.

[0048] The following are the descriptions of the reference numerals:

[0049] 1. first separation turbine; 11. cylindrical portion; 111. first separation hole; 112. pin block; 12. disc portion; 121. mounting hole; 122. through hole;

[0050] 2. Second separation turbine; 21. Second separation hole;

[0051] 3. Discharging pipe network; 31. Grid; 32. Separation net;

[0052] 4. External gland;

[0053] 100, rack; 110, guide rail;

[0054] 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;

[0055] 300, motor;

[0056] 400, transmission mechanism;

[0057] 500, spindle; 510, material output channel; 520, via hole;

[0058] 600, circulating grinding mechanism; 610, impeller; 611, shaft hole; 612, forward channel; 613, reverse channel; 614, pin block-shaped protrusion; 620, spacer;

[0059] 700, separation mechanism;

[0060] 800. Cooling system. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] Reference Figure 1 and Figure 2 An embodiment of the present invention provides a separation mechanism for a sand mill, comprising a first separation turbine 1, a second separation turbine 2, a discharge pipe network 3 and an outer pressure cover 4.

[0068] Reference Figure 3 , Figure 4 and Figure 5 The first separation turbine 1 includes a cylindrical portion 11 and a disk portion 12 .

[0069] The cylindrical portion 11 is cylindrical with a cavity inside, and a first separation hole 111 is opened on the cylindrical wall of the cylindrical portion 11. The first separation hole 111 obliquely penetrates the cylindrical wall of the cylindrical portion 11, so that the first separation hole 111 can connect the spaces on both sides of the cylindrical wall of the cylindrical portion 11, so that the larger material particles and grinding beads in the cylindrical portion 11 can flow out of the cylindrical portion 11 through the first separation hole 111 along with the slurry.

[0070] The first separation hole 111 obliquely penetrates the wall of the cylindrical portion 11, which means that the penetration direction of the first separation hole 111 is not along the radial direction of the cylindrical portion 11, but has a certain angle with the radial direction of the cylindrical portion 11. The angle enables the inner wall of the inclined first separation hole 111 to act like a turbine blade when the cylindrical portion 11 rotates around the main axis, and can throw larger material particles and grinding beads out of the cylindrical portion 11 along with the slurry, thereby achieving the separation function of larger particles (including larger material particles and grinding beads) and smaller material particles.

[0071] The first separation hole 111 may be a strip hole whose length direction is parallel to the axial direction of the cylindrical portion 11. A plurality of first separation holes 111 may be evenly distributed on the cylinder wall of the cylindrical portion 11, so that the first cylinder wall is hollowed out, which not only effectively reduces the weight of the first separation turbine 1, but also enables the separation flow of materials to be smoother and more efficient.

[0072] In some embodiments, a pin block 112 is fixed to the outer side of the cylindrical wall of the cylindrical portion 11. The surface of the pin block 112 facing the rotation direction of the cylindrical portion 11 is an inclined surface, so that when the pin block 112 rotates with the cylindrical portion 11, 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 circulating grinding mechanism in front, so that the larger material particles can be ground again at the circulating grinding mechanism.

[0073] Specifically, a plurality of pin blocks 112 can be arranged to avoid the first separation hole 111, thereby improving the efficiency and effect of conveying materials. The pin block 112 protruding from the wall of the cylindrical portion 11 can also generate a large relative movement with the protrusion fixed on the inner wall of the grinding chamber 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.

[0074] The disc-shaped portion 12 is fixed to one end of the cylindrical portion 11, so that the first separation turbine 1 is in the shape of a barrel with an opening at one end. The disc-shaped portion 12 and the cylindrical portion 11 can be integrally formed. When installed and used in a sand mill, the end to which the disc-shaped portion 12 is fixed is close to the circulating grinding mechanism.

[0075] The disc-shaped portion 12 is provided with a mounting hole 121 matching the main shaft. Through the matching and key connection between the mounting hole 121 and the main shaft, the first separation turbine 1 can be mounted on the main shaft and run driven by the main shaft.

[0076] The disc-shaped portion 12 is provided with an inclined through hole 122 like a forward channel on an impeller. When the disc-shaped portion 12 rotates with the main shaft, the inner wall of the inclined through hole 122 can transport material particles and grinding beads along with the slurry into the internal cavity of the cylindrical portion 11 like an inclined blade.

[0077] In some embodiments, the first separation turbine 1 may not be provided with the disc-shaped portion 12, but the cylindrical portion 11 may be supported and driven by other components.

[0078] For example, one end of the cylindrical portion 11 can be directly fixed to the impeller of the front circulating grinding mechanism. Thus, the impeller replaces the function of the disc portion 12, which can not only support the cylindrical portion 11 and drive the cylindrical portion 11 to rotate, but also can transport the ground materials into the cylindrical portion 11.

[0079] Other components may also be provided to mount and support the cylindrical portion 11 on the main shaft, and the inertia of the material etc. after being ground by the circulating grinding mechanism to move backwards is utilized to allow the material etc. to enter the cylindrical portion 11 .

[0080] In some embodiments, the disc-shaped portion 12 may only serve to install, support and drive the cylindrical portion 11 on the main shaft.

[0081] For example, the disc-shaped portion 12 may be a wheel-shaped portion with spokes, or a hollow disc-shaped portion, without the inclined through-holes 122. The materials etc. enter the cylindrical portion 11 by the inertia of backward movement or by the conveying action of other mechanisms.

[0082] In some embodiments, the disc-shaped portion 12 may also be provided separately from the cylindrical portion 11 .

[0083] In this case, the disc-shaped portion 12 no longer plays a role in installing and supporting the cylindrical portion 11, and cannot drive the cylindrical portion 11 to rotate. The cylindrical portion 11 relies on other components to achieve installation, support and driving. However, the through hole 122 obliquely opened on the disc-shaped portion 12 can still independently realize the function of conveying materials in the cylindrical portion 11.

[0084] Reference Figure 6 and Figure 7 The second separation turbine 2 is in the shape of a cylinder with a cavity inside, and is sleeved in the cavity of the first separation turbine 1 and is coaxial with the cylindrical portion 11 of the first separation turbine 1, thereby forming a two-stage separation mechanism.

[0085] A second separation hole 21 is provided on the cylinder wall of the second separation turbine 2. The second separation hole 21 obliquely penetrates the cylinder wall of the second separation turbine 2, so that the second separation hole 21 communicates with the spaces inside and outside the second separation turbine 2.

[0086] The inclination direction of the second separation hole 21 is consistent with the inclination direction of the first separation hole 111 on the cylindrical portion 11. The second separation hole 21 can be a strip hole whose length direction is parallel to the axial direction of the second separation turbine 2. A plurality of second separation holes 21 can be evenly distributed on the cylinder wall of the second separation turbine 2, so that the cylinder wall of the second separation turbine 2 is hollowed out, which not only effectively reduces the weight of the second separation turbine 2, but also enables the separation flow of materials to be smoother and more efficient.

[0087] The outer side surface of the cylinder wall of the second separation turbine 2 is spaced a certain distance from the inner side surface of the cylinder wall of the cylindrical portion 11 of the first separation turbine 1. Thus, sufficient separation space and time are provided to make the separation more thorough.

[0088] The front end of the second separation turbine 2 is detachably fixed to the disk-shaped portion 12 of the first separation turbine 1 , so that the second separation turbine 2 is supported and driven by the disk-shaped portion 12 of the first separation turbine 1 .

[0089] The radius of the second separation turbine 2 is smaller than the distance from the through hole 122 on the disc-shaped portion 12 to the axis of the first separation turbine. That is, in the radial direction, the through hole 122 is located between the second separation turbine 2 and the inner wall of the cylindrical portion 11, so that the material and grinding beads entering the first separation turbine 1 from the through hole 122 are located inside the first separation turbine 1 and outside the second separation turbine 2.

[0090] After the material slurry and grinding beads enter the first separation turbine 1 through the through hole 122 , some grinding beads and material particles that are obviously too large may first pass through the first separation hole 111 opened in the cylindrical portion 11 under the action of centrifugal force and be thrown out of the first separation turbine 1 .

[0091] The second largest material particles, although smaller than the obviously oversized material particles, are still larger material particles than the smaller material particles. Due to the pumping action of the second separation turbine 2 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 21 and enter the second separation turbine 2.

[0092] These second largest material particles and the remaining grinding beads will eventually be thrown out of the first separation turbine 1 through the first separation hole 111 opened in the cylindrical portion 11 under the action of centrifugal force, the pumping action of the second separation turbine 2, and the pumping action of the first separation turbine 1.

[0093] Smaller material particles can enter the second separation turbine 2 along with the slurry through the second separation hole 21 provided on the second separation turbine 2, and then pass through the discharge pipe network 3 provided in the second separation turbine 2 to enter the material output channel and be output from the sand mill.

[0094] 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.

[0095] After the sand mill is stopped, the first separation turbine 1 and the second separation turbine 2 no longer rotate, 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 1 and the second separation turbine 2. The larger material particles and grinding beads in the slurry may enter the second separation turbine 2 along the second separation hole 21. 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.

[0096] Once the sand mill is started, the first separation turbine 1 and the second separation turbine 2 begin to operate, and the larger material particles and grinding beads in the second separation turbine 2 will be thrown out of the second separation turbine 2 through the second separation hole 21 under the centrifugal force and the pumping action of the second separation turbine 2, and then through the pumping action of the first separation turbine 1, the separation effect is achieved outside the first separation turbine 1.

[0097] Reference Figure 8 The discharge pipe network 3 is sleeved on the main shaft and located in the cavity of the second separation turbine 2 to cover the through hole on the main shaft and prevent the grinding beads that have not been separated from entering the material output channel.

[0098] When only the first separation turbine 1 is provided, the discharge pipe network 3 is located in the cavity of the cylindrical portion 11 of the first separation turbine 1 .

[0099] The front end of the discharge pipe network 3 is detachably fixed to the disc-shaped portion 12 , so that the discharge pipe network 3 obtains installation support.

[0100] The discharge pipe network 3 comprises a grid frame 31 and a separation network 32. The separation network 32 is fixed on the grid frame 31 to form a tubular discharge pipe network 3 to cover the through hole opened on the main shaft.

[0101] The outer pressure cover 4 is detachably fixed to the rear end of the main shaft by screws, and is used to detachably fix the rear end of the first separation turbine 1 , the rear end of the second separation turbine 2 , and the rear end of the discharge pipe network 3 .

[0102] Reference Fig. 9 and Fig.10 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 circulating grinding mechanism 600, and a separation mechanism 700 in the above embodiment.

[0103] 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.

[0104] Reference Fig.11 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 .

[0105] 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 .

[0106] The inner cavity of the cylinder liner 220 is the grinding chamber 221. The grinding chamber 221 can accommodate the separation mechanism 700 and the circulating grinding mechanism 600, 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.

[0107] A plurality of inwardly protruding protrusions 230 are fixedly arranged on the inner wall of the grinding chamber 221. The protrusions 230 fixed on the inner wall of the grinding chamber 221 interact with the pin block 112 on the separation mechanism 700 and the pin block-shaped protruding portion 614 on the circulating grinding mechanism 600 to drive the grinding beads to produce a larger relative movement, thereby improving the grinding effect on the material.

[0108] Reference Fig.12 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 613 on the circulating grinding mechanism 600 and the inclined direction of the inclined surface of the pin block 112 on the separation mechanism 700. 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.

[0109] 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°.

[0110] The front and rear ends of the cylinder 200 are both provided with sealing covers. After the sand mill is assembled, 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, the grinding chamber 221 inside the cylinder 200 is sealed.

[0111] 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.

[0112] 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 700 and the circulation grinding mechanism 600.

[0113] Reference Fig.13 and Fig.14 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 700 may flow into the material output channel 510 along with the slurry through the through hole 520.

[0114] 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.

[0115] Reference Fig.15 In some embodiments, the circulating grinding mechanism 600 includes an impeller 610 and a spacer 620 .

[0116] Reference Fig.16 and Fig.17 The impeller 610 is provided with an axial hole 611 so that the impeller 610 can be mounted on the main shaft 500 of the sand mill. A keyway can be provided on the inner wall of the axial hole 611 of the impeller 610 so that the impeller 610 and the main shaft 500 can form a key connection, thereby making the impeller 610 rotate with the rotation of the main shaft 500 to stir the grinding beads and the material slurry to move and grind the material.

[0117] In some embodiments, the impeller 610 is provided with a forward channel 612 and a reverse channel 613 obliquely penetrating the impeller 610. That is, the extension direction of the forward channel 612 and the extension direction of the reverse channel 613 are different from the extension direction of the shaft hole 611 of the impeller 610, so that the extension direction of the forward channel 612 and the extension direction of the reverse channel 613 have a certain angle with the axial direction of the main shaft 500. When the impeller 610 rotates with the main shaft 500, the material and grinding beads passing through the forward channel 612 and the reverse channel 613 can be pushed forward or backward.

[0118] The inclination directions of the forward channel 612 and the reverse channel 613 are opposite. For example, the forward channel 612 is inclined to the left, and the reverse channel 613 is inclined to the right, so that when the impeller 610 rotates, the material and grinding beads passing through the forward channel 612 can be pushed to move backward, and the material and grinding beads passing through the reverse channel 613 can be pushed to move forward.

[0119] Specifically, the forward channel 612 can be opened near the shaft hole 611 near the impeller 610. A plurality of forward channels 612 can be opened around the shaft hole 611, so that when the sand mill main shaft 500 rotates, the material slurry and grinding beads in the grinding chamber 221 can flow from front to back in the surrounding area near the main shaft 500 and grind the material.

[0120] The reverse channel 13 is far away from the shaft hole 11 of the impeller 1. For example, the reverse channel 613 can be opened near the outer peripheral edge of the impeller 610. A plurality of reverse channels 613 can be distributed along the outer peripheral edge area of ​​the wheel, so that when the impeller 610 rotates with the main shaft 500, the larger material particles in the grinding chamber 221 can flow reversely from back to front in the edge area close to the impeller 610 (that is, the area in the grinding chamber 221 away from the main shaft 500), and then further grind in the process of flow. After the larger material particles flow in reverse and reach the front of the impeller 610, they can enter the forward channel 612 again, flow from front to back and grind again.

[0121] It can be understood that in this embodiment, the number, structural form, etc. of the forward channel 612 and the reverse channel 613 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.

[0122] In some embodiments, the reverse channel 613 is a notch obliquely opened at the outer peripheral edge of the impeller 610, so that the reverse channel 613 is in the shape of an inclined groove, which not only reduces the overall weight of the impeller 610, but also increases the space for the reverse flow of materials.

[0123] The protruding edge of the impeller 610 is pin-block shaped, and the protruding portion is referred to herein as the pin-block protruding portion 614. During the rotation of the impeller 610, the moving pin-block protruding portion 614 and the fixed parts in the grinding chamber 221 can generate a large relative movement, thereby increasing the grinding of the material particles.

[0124] The impeller 610 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.

[0125] In some embodiments, the circulating grinding mechanism 600 includes a plurality of impellers 610. The plurality of impellers 610 are installed on the main shaft 500 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 610 can be set according to actual needs.

[0126] It is understandable that only one impeller 610 that meets the above structural characteristics can also achieve the technical effect of cyclic grinding to a certain extent.

[0127] Reference Fig.18 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.

[0128] Similarly, in the high-speed rotating flow field formed in the grinding chamber 221, larger grinding beads are farther away from the main axis 500, and smaller grinding beads are closer to the main axis 500. The farther away from the main axis 500, the greater the density distribution of the grinding beads; the closer to the main axis 500, the smaller the density distribution of the grinding beads.

[0129] In the rotating flow field formed in the grinding chamber 221, the farther away from the main shaft 500, the greater the linear speed of rotation, and thus the greater the grinding intensity of the material particles; the closer to the main shaft 500, the smaller the linear speed of rotation, and the smaller the grinding intensity of the material particles.

[0130] The notch (reverse channel 613) on the edge of the impeller 610 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 221 circulates backward (i.e., reversely), and the grinding time in the grinding chamber 221 is prolonged. By repeating this cycle, larger material particles will be quickly ground.

[0131] The oblique hole (forward channel 612) around the impeller 610 near the shaft hole 611 is closest to the main shaft 500 and is also where the smallest particles are concentrated. When the impeller 1 rotates, the oblique hole (forward channel 12) exerts a positive push on the slurry, pushing the smallest particles in the grinding chamber 221 toward the separation mechanism 700, so that the smallest particles in the grinding chamber 221 are quickly discharged from the grinding chamber 221, so that the small particles will not be over-grinded (over-grinding is not good either, as over-grinding means grinding them too small).

[0132] The speed at which the small particles become smaller is also relatively slow. The time that the small particles are in the grinding chamber 221 is very short, and the time that they are ground is also very short, and the energy consumption is also relatively small, which can save electric energy.

[0133] 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.

[0134] Large particles take a long time to grind, and power (electricity) is mainly used for the effective grinding of large particles, which greatly improves grinding efficiency and product quality while achieving energy conservation and environmental protection.

[0135] The spacer 620 is sleeved on the main shaft 500, and the spacer 620 and the impeller 610 are alternately arranged to separate two adjacent impellers 610 by a certain distance. The diameter of the spacer 620 is larger than the diameter of the shaft hole 611 of the impeller 610 and smaller than the distance from the forward channel 612 to the axis of the shaft hole 611, so as to avoid affecting the flow of materials through the forward channel 612 on the impeller 610.

[0136] 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.

[0137] In summary, a specific working process of the sand mill and the circulating grinding mechanism 600 of the sand mill of the present invention is as follows:

[0138] After the sand mill is started, the main shaft 500 drives the circulating grinding mechanism 600 and the separation mechanism 700 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.

[0139] The material slurry is mixed with the grinding beads in the grinding chamber 221 under the stirring of the circulating grinding mechanism 600. The material slurry mixed with the grinding beads passes through the forward channel 612 on the impeller 610 from the area near the main shaft 500, and continues to flow backward under the pumping action of the forward channel 612.

[0140] Under the stirring action of the impeller 610 and the backward flow of the slurry, the grinding beads in the slurry are constantly colliding, rubbing and squeezing each other, thereby crushing and shearing the material particles in the slurry, breaking the larger material particles in the slurry into smaller material particles.

[0141] Under the rotation of the multiple impellers 610, the material particles in the slurry are continuously broken. As the slurry flows backward, the larger material particles are continuously reduced, while the smaller material particles are continuously increased. The slurry finally flows into the separation mechanism 700, 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 600 for further grinding.

[0142] 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.

[0143] Reference Fig.19 Due to the pumping action of the forward channel 612 on the impeller 610, the material entering the grinding chamber 221 gradually passes through the forward channels 612 of all impellers 610 from front to back and enters the separation mechanism 700, and the larger material particles A in the slurry are also continuously broken into smaller material particles B during the movement.

[0144] Every time the slurry passes through the forward channel 612 of the impeller 610 , the material particles therein will be broken once. In most cases, the material particles passing through the forward channel 612 of the impeller 610 are in a mixed state of larger material particles A and smaller material particles B.

[0145] 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 613 of the impeller 610. Under the pumping action of the reverse channel 613, 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 612 of the previous impeller 610 and continue to move backward along the area near the main shaft 500.

[0146] If the larger material particles A are not crushed into smaller material particles B after passing through the reverse channel 613 of an impeller 610 and the area near the inner wall of the grinding chamber 221 corresponding to the impeller 610, they will continue to move forward under the pumping of the reverse channel 613 of the previous impeller 610 and enter the reverse channel 613 of the previous impeller 610 and the area near the inner wall of the corresponding grinding chamber 221 to continue grinding and crushing.

[0147] If the larger material particles A are crushed into smaller material particles B after passing through the reverse channel 613 of an impeller 610 and the corresponding area near the inner wall of the 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, move backward through the forward channel 612 of the impeller 610.

[0148] Here, the material circulation path occurring in the vicinity of the impeller 610 of the circulation grinding mechanism 600 is referred to as a small circulation path of the circulation grinding mechanism 600 .

[0149] After the ground material slurry and grinding beads enter the separation mechanism 700, under the action of the first separation turbine 1 and the second separation turbine 2 of the separation mechanism 700, the larger material particles A and grinding beads are quickly separated to the area outside the separation mechanism 700 near the inner wall of the grinding chamber 221.

[0150] The separated larger material particles A and grinding beads can be further crushed and ground under the interaction of the pin block 112 on the cylindrical portion 11 of the first separation turbine 1 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 700 again from the front area of ​​the separation mechanism 700 under the action of the rotating flow field and the pumping action of the obliquely opened through hole 122 on the disc portion 12 of the first separation turbine 1.

[0151] Here, the material circulation path occurring in the vicinity of the separation mechanism 700 is referred to as a small circulation path of the separation mechanism 700 .

[0152] Reference Fig. 20 If the larger material particles A are not ground into smaller material particles B between the pin block 112 on the cylindrical portion 11 of the first separation turbine 1 and the inner wall of the grinding chamber 221, the larger material particles A continue to move forward to the circulating grinding mechanism 600 for further grinding under the pumping action of the inclined surface of the pin block 112 and the pumping action of the inclined reverse channel 613 on the impeller 610 of the front circulating grinding mechanism 600.

[0153] Here, the material circulation path between the separation mechanism 700 and the circulation grinding mechanism 600 is referred to as a large circulation path.

[0154] In actual work, the large circulation path between the separation mechanism 700 and the circulation grinding mechanism 600, the small circulation path of the separation mechanism 700, and the small circulation path of the circulation grinding mechanism 600 exist and occur simultaneously.

[0155] In the separation mechanism 700 , smaller material particles B, under the action of the rotating flow field, pass through the discharge pipe network 3 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 .

[0156] In the above embodiments, the structural scheme and working principle of the separation mechanism 700 for the sand mill are not limited to or dependent on the structural scheme and working principle of the circulating grinding mechanism 600 in the embodiments. By replacing it with a circulating grinding mechanism 600 with a different principle but the same function, the separation mechanism 700 for the sand mill of the present invention can still achieve its function of separating larger material particles from smaller material particles.

[0157] 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 separation mechanism for a sand mill, characterized in that: include: The first separation turbine comprises a cylindrical portion, wherein the cylindrical portion is in a cylindrical shape with a cavity inside; a first separation hole is opened on the cylindrical wall of the cylindrical portion; The first separation hole obliquely penetrates the cylindrical wall of the cylindrical portion to connect the spaces inside and outside the cylindrical portion, and when the cylindrical portion rotates with the main shaft, the larger material particles in the cylindrical portion are transported to the outside of the cylindrical portion; The second separation turbine is in the shape of a cylinder with a cavity inside, is arranged in the cavity of the cylinder portion, and is spaced apart from the inner wall of the cylinder portion; a second separation hole is opened on the cylinder wall of the second separation turbine; The second separation hole obliquely penetrates the cylinder wall of the second separation turbine to connect the spaces inside and outside the second separation turbine, and prevents larger material particles outside the second separation turbine from entering the second separation turbine when rotating with the main shaft.

2. The separation mechanism for a sand mill according to claim 1, characterized in that: A pin block is fixed on the outer side of the cylinder wall of the cylindrical portion; The pin block is provided with an inclined surface, so that when the cylindrical part rotates, the pin block can drive the material to move toward the inner circulation mechanism of the sand mill.

3. The separation mechanism for a sand mill according to claim 2, characterized in that: There are a plurality of pin blocks distributed on the outer side of the cylinder wall of the cylinder portion.

4. The separation mechanism for a sand mill according to claim 1, characterized in that: The first separation turbine further includes a disk-shaped portion; The disc-shaped portion is arranged at one end of the cylindrical portion, and a through hole is obliquely opened on the disc-shaped portion; The inclined direction of the through hole enables the material to flow into the cavity of the cylindrical part through the through hole when the disc-shaped part rotates with the main shaft.

5. The separation mechanism for a sand mill according to claim 4, characterized in that: A distance from the through hole to the axial center line of the first separation turbine is greater than a radius of the second separation turbine and smaller than a radius of the cavity in the cylindrical portion.

6. The separation mechanism for a sand mill according to claim 1, characterized in that: The first separation turbine further includes a disk-shaped portion; The disc-shaped portion is fixed to one end of the cylindrical portion, and a mounting hole capable of matching with the main shaft is opened on the disc-shaped portion so as to mount the first separation turbine on the main shaft.

7. The separation mechanism for a sand mill according to claim 1, characterized in that: There are a plurality of first separation holes distributed on the cylinder wall of the cylinder portion.

8. The separation mechanism for a sand mill according to claim 1, characterized in that: Also includes: The material discharging pipe network is sleeved on the main shaft and located in the cavity of the cylindrical part to prevent the grinding beads from entering the material discharging channel on the main shaft.

9. The separation mechanism for a sand mill according to claim 8, characterized in that: The discharge pipe network includes a grid and a separation net; the separation net is fixed on the grid to form the discharge pipe network in a tubular shape.

10. A sand mill, characterized in that: It comprises a main shaft, a circulation mechanism and a separation mechanism for a sand mill as claimed in any one of claims 1 to 9; The circulation mechanism is installed on the main shaft and is used to cyclically grind larger material particles 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 so as to supply the larger particles to the circulation mechanism for circulation grinding.

Images