Separating wheel mechanism and screenless vertical sand mill with the same

Abstract

The present application relates to sand grinding equipment field, especially point to a kind of separation wheel mechanism, the separation wheel mechanism includes separation wheel seat, the center position of the top of the separation wheel seat is discharge area, the top of the separation wheel seat is uniformly provided with a plurality of separation lugs around the discharge area, adjacent separation lugs form separation discharge channel communicated with the discharge area, the separation discharge channel is curve, and the separation discharge channel gradually expands from outside to inside, since the entrance of separation discharge channel is smaller, the outlet is larger, not only effectively reduce the probability of grinding medium from entrance into separation discharge channel, but also facilitate the slurry in separation discharge channel to flow to discharge area quickly, increase discharge rate.The present application also relates to a vertical sand mill without screen, by setting up main shaft discharge channel and baffle, further eliminate the possibility of grinding medium to discharge outward, realize the complete separation of grinding slurry and grinding medium.

Description

Technical Field

[0001] This invention relates to the field of sand milling equipment, and in particular to a separating wheel mechanism and a screenless vertical sand mill having the separating wheel mechanism. Background Technology

[0002] Nano-grinding mills are high-efficiency devices used for ultrafine grinding, especially for dispersing and grinding nanoscale materials. During operation, a high-speed rotating grinding rotor energizes the grinding media (such as zirconium balls) and the material. High-frequency collisions and friction occur between the grinding media and between the grinding media and the grinding drum wall. Under the extrusion and shearing action of the grinding media, the particle size of the material is ground to the nanoscale. To prevent the grinding media, such as zirconium balls, from being discharged along with the material being ground, existing technologies typically install a screen on the grinding spindle to separate the material from the grinding media. However, due to the different particle sizes of the materials, the screen often becomes clogged, requiring machine shutdown for screen clearing, which in turn affects the grinding efficiency.

[0003] To address the problem of screen clogging, screenless vertical nano-sand mills have emerged in recent years. For example, Chinese utility model patent CN215312819U discloses a vertical sand mill with dual separation channels, which includes a bearing housing with a hollow main shaft passing through it. A grinding cylinder is located below the hollow main shaft. The hollow main shaft includes a secondary separation device, which is sleeved with a primary separation device. The primary separation device includes a dispersion cylinder and a cavity. A primary material channel is opened on the side wall of the dispersion cylinder, and a cover is provided at the upper end of the dispersion cylinder. By setting up two-stage separation devices, the grinding media and materials are separated, thus eliminating the need for a screen. However, due to the large size of the primary feed channel in this sand mill, large particles and grinding media can easily enter between the primary and secondary separation devices. Furthermore, the size of the secondary feed channel in the secondary separation device is much smaller than that of the primary feed channel. Therefore, the discharge speed of the secondary feed channel is much lower than that of the primary feed channel, resulting in the accumulation of materials and grinding media between the primary and secondary separation devices. This affects the separation effect of materials and grinding media, as well as the discharge rate of the ground material, and can easily cause ball-running. Summary of the Invention

[0004] The purpose of this invention is to provide a separating wheel mechanism and a screenless vertical sand mill having the separating wheel mechanism, which can solve the technical problems in the prior art where screenless vertical sand mills are prone to accumulation, resulting in poor separation effect between materials and grinding media, poor discharge rate of materials after grinding, and easy ball running.

[0005] To achieve the above objectives, on the one hand, the present invention provides a separating wheel mechanism, the separating wheel mechanism including a separating wheel seat, the center position of the top of the separating wheel seat being a discharge area, and a plurality of separating protrusions being evenly arranged around the discharge area on the top of the separating wheel seat, and a separating discharge channel communicating with the discharge area being formed between adjacent separating protrusions, the separating discharge channel being curved and gradually expanding from the outside to the inside.

[0006] Furthermore, the separating protrusion includes a first arcuate surface, a second arcuate surface, and a connecting surface connected in sequence. The first arcuate surface and the second arcuate surface both extend along the direction from the center position to the edge position of the separating wheel seat, and the connecting surface is located near the edge position of the separating wheel seat. Along the rotation direction of the separating wheel seat, the separating discharge channel is formed between the second arcuate surface in one separating protrusion and the first arcuate surface in the next separating protrusion. The radius of curvature of the first arcuate surface is greater than or equal to the radius of curvature of the second arcuate surface.

[0007] Furthermore, along the rotation direction of the separating wheel seat, the connecting surface sequentially includes a small rounded surface, a third arc-shaped surface, and a large rounded surface. The small rounded surface is connected to the end of the first arc-shaped surface away from the center position, and the large rounded surface is connected to the end of the second arc-shaped surface away from the center position.

[0008] Furthermore, the projections of the first arc-shaped surface, the second arc-shaped surface, and the third arc-shaped surface onto the horizontal plane are respectively the first arc-shaped line, the second arc-shaped line, and the third arc-shaped line. In the same separating protrusion, the point on the third arc-shaped line with the longest distance between it and the rotation center of the separating wheel seat is farther from the outer end point of the first arc-shaped line than it is from the outer end point of the second arc-shaped line.

[0009] Furthermore, the projections of the second and third arcuate surfaces onto the horizontal plane are the first arcuate line, the second arcuate line, and the third arcuate line, respectively. Within the same separating protrusion, the distance between the center of curvature of the third arcuate line and the outer endpoint of the first arcuate line is less than the distance between the center of curvature of the third arcuate line and the outer endpoint of the second arcuate line.

[0010] Furthermore, a fixing ring is provided in the discharge area, and a plurality of fixing countersunk holes are provided in the separation wheel seat located inside the fixing ring; the separation protrusion and the separation wheel seat are detachably connected.

[0011] Furthermore, the bottom surface of the separating wheel seat is uniformly provided with a plurality of strip-shaped propulsion protrusions around the central position. Along the rotation direction of the separating wheel seat, each strip-shaped propulsion protrusion has a first inclined plane on its front side and a vertical plane on its back side. The vertical plane is perpendicular to the bottom surface of the separating wheel seat and is set at an angle to the radial direction of the separating wheel seat. The first inclined plane is set at an angle to the bottom surface of the separating wheel seat.

[0012] On the other hand, the present invention also provides a screenless vertical sand mill, which has a separating wheel mechanism as described in any of the above embodiments. The screenless vertical sand mill further includes a grinding cylinder, a main shaft rotatably connected to the grinding cylinder, and a drive mechanism for driving the main shaft to rotate. A grinding rotor is provided inside the grinding cylinder. The grinding rotor includes a top wall and a side wall connected to the outer edge of the top wall. The side wall is cylindrical. A grinding cavity is opened inside the grinding rotor. A plurality of opposite diameter changing channels are provided through the side wall. The separating wheel mechanism is disposed in the grinding cavity. A main shaft discharge channel is opened inside the main shaft. The bottom end of the main shaft passes through the top wall of the grinding cylinder and the top wall of the grinding cavity in sequence and extends to the discharge area of ​​the separating wheel mechanism. The main shaft discharge channel is connected to the discharge area. The grinding rotor and the separating wheel mechanism both rotate synchronously with the main shaft.

[0013] Furthermore, it also includes a discharge cylinder, the top end of the main shaft extends into the interior of the discharge cylinder, the top end of the main shaft discharge channel penetrates the top wall of the main shaft to communicate with the interior of the discharge cylinder, and the bottom of the main shaft is uniformly provided with a plurality of discharge connection channels communicating with the main shaft discharge channel along the outer periphery of the main shaft discharge channel. The ends of the plurality of discharge connection channels away from the main shaft discharge channel each extend downward at an incline relative to the central axis of the main shaft and penetrate the side wall of the main shaft. The projection of the plurality of discharge connection channels on the horizontal plane is set at an angle to the radial direction of the main shaft.

[0014] Furthermore, a baffle is fixed at the top of the main shaft, and a baffle through hole communicating with the discharge channel of the main shaft is opened in the middle of the baffle. The inner diameter of the baffle through hole decreases from bottom to top.

[0015] The beneficial effects of this invention are as follows:

[0016] (1) The separation discharge channel gradually expands from the outside to the inside, that is, the inlet is smaller and the outlet is larger. With this setting, when the separation wheel mechanism rotates rapidly, the dynamic pressure at the inlet of the separation discharge channel increases, which increases the resistance that the grinding media needs to overcome to flow into the separation discharge channel. This effectively reduces the probability that the grinding media in the grinding area will flow into the separation discharge channel from the inlet. Moreover, after the slurry enters the separation discharge channel, the width of the separation discharge channel gradually increases, which is conducive to the rapid flow of the slurry in the separation discharge channel to the discharge area, thereby making the slurry quickly discharged outward. When grinding media enter the separation discharge channel, the grinding media is difficult to discharge outward due to its high density. However, due to the rapid rotation of the separation wheel mechanism, the grinding media is more likely to leave the separation discharge channel and return to the grinding area under the action of centrifugal force. That is, the small inlet of the separation discharge channel will not affect the discharge of the grinding media in the separation discharge channel back to the grinding area.

[0017] (2) By setting arc surfaces on both sides of the separation discharge channel, and the curvature radii of the arc surfaces on both sides are different, the centrifugal force on the side with smaller curvature radius is greater, and the separation discharge channel gradually expands from the outside to the inside. According to the formula for mass conservation, centrifugal force and linear velocity calculation, the material flow rate is faster closer to the outside of the separation discharge channel. The material flowing along the side with smaller curvature radius makes centrifugal motion towards the rotation direction. When the material in the outer peripheral area of ​​the separation wheel carries a small amount of grinding media and moves inward along the curve of the first and second arc surfaces in the form of a liquid film under the action of the Coanda effect, the centrifugally moving material and the inward moving material converge. Under the action of drag and relative pressure difference, the small amount of grinding media carried by the separation material is continuously peeled off and separated, so that the grinding media will not flow out into the main shaft discharge channel, further realizing the complete separation of grinding media and material, and further reducing the probability of ball running.

[0018] (3) The third arc surface on the outer side of each separation protrusion forms a curvature peeling protrusion structure. Since the point with the largest linear velocity on the third arc surface is set close to the large rounded surface, when the material on the outer periphery of the separation wheel mechanism flows through the third arc surface, the grinding media and large-diameter material particles are separated in advance under the action of centrifugal force. Small-diameter material particles flow along the third arc surface towards the separation discharge channel 44 in the form of liquid film under the action of Coanda effect, thereby realizing the classification and pre-separation function, and further reducing the probability of grinding media and large-diameter material particles flowing into the separation discharge channel.

[0019] (4) By setting strip-shaped push protrusions, when the separation wheel mechanism rotates, the first inclined plane of the strip-shaped push protrusions imparts radial and circumferential tangential velocity components to the material and grinding media along the rotation direction, thereby driving the material and grinding media at the bottom of the grinding cylinder to circulate in the grinding cylinder cavity, increasing the collision frequency between the grinding media, that is, improving the grinding efficiency, and further avoiding the formation of a grinding dead zone at the bottom of the grinding cylinder.

[0020] (5) By fixing a baffle at the top of the main shaft, and the inner wall of the baffle through hole in the middle of the baffle is inclined from the outside to the inside, when a very small amount of grinding media rises along the side wall of the main channel to the top of the main channel, the inclined inner wall of the baffle through hole can effectively block this part of the grinding media, preventing the grinding media from leaving the main channel and entering the discharge cylinder, thereby achieving complete separation of the grinding slurry and the grinding media, and eliminating the possibility of the grinding media being discharged outward. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the separating wheel mechanism of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the separating wheel mechanism of the present invention from another angle.

[0023] Figure 3 This is a top view of the separation wheel mechanism of the present invention.

[0024] Figure 4 This is a top view of the separation bump structure of the present invention.

[0025] Figure 5 This is a three-dimensional structural diagram of the screenless vertical sand mill of the present invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the main shaft, the separating wheel mechanism, and the grinding rotor combined together according to the present invention.

[0027] Figure 7 This is a cross-sectional structural diagram of the main shaft, the separating wheel mechanism, and the grinding rotor of the present invention.

[0028] Figure 8 This is a cross-sectional view of the pressure sensor, discharge cylinder, main shaft, and second pulley of the present invention.

[0029] Figure 9 for Figure 8 A magnified structural diagram of point A in the middle.

[0030] Figure 10 This is a three-dimensional structural diagram of the grinding rotor of the present invention.

[0031] Figure 11 This is a three-dimensional structural diagram of the grinding rotor of the present invention from another angle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 2-Grinding cylinder; 3-Grinding rotor; 31-Grinding cavity; 32-Grinding rod; 320-Second inclined plane; 33-Anti-directional diameter changing channel; 331-Top surface; 332-First side surface; 333-Bottom surface; 334-Second side surface; 34-Top wall; 35-Side wall; 4-Separating wheel mechanism; 41-Separating wheel seat; 42-Discharge area; 43-Separating protrusion; 431-First arc-shaped surface; 432-Second arc-shaped surface; 433-Connecting curved surface; 4331-Small rounded surface; 4332-Third arc-shaped surface; 4333-Large rounded surface Circular surface; 44-Separation discharge channel; 45-Fixing ring; 46-Counterhead; 47-Strip-shaped propulsion protrusion; 471-Vertical plane; 472-First inclined plane; 5-Drive mechanism; 51-Motor; 52-First pulley; 53-Second pulley; 6-Main shaft; 61-Main shaft discharge channel; 611-Large diameter section; 612-Transition section; 613-Small diameter section; 62-Discharge connection channel; 7-Discharge cylinder; 71-Discharge through hole; 8-Baffle; 81-Baffle through hole; 9-Feeding mechanism; 10-Frame; 11-Pressure sensor. Detailed Implementation

[0034] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0035] Example 1

[0036] like Figure 1-3 As shown, the present invention provides a separating wheel mechanism, the separating wheel mechanism 4 including a separating wheel seat 41, the center of the top of the separating wheel seat 41 being a discharge area 42, a plurality of separating protrusions 43 being evenly arranged around the discharge area 42 on the top of the separating wheel seat 41, and a separating discharge channel 44 communicating with the discharge area 42 being formed between adjacent separating protrusions 43, the separating discharge channel 44 being curved and gradually expanding from the outside to the inside.

[0037] In practical use, multiple separation protrusions 43 are set on the top of the separation wheel seat 41 to form multiple separation discharge channels 44. Since the separation discharge channels 44 gradually expand from the outside to the inside, that is, the inlet is smaller and the outlet is larger, this setting increases the dynamic pressure at the inlet of the separation discharge channel 44 when the separation wheel mechanism 4 rotates rapidly. This increases the resistance that the grinding media needs to overcome to flow into the separation discharge channel 44, thereby effectively reducing the probability that the grinding media in the grinding area will flow into the separation discharge channel 44 from the inlet. Moreover, after the slurry enters the separation discharge channel 44, The width of the separation discharge channel 44 gradually increases, which facilitates the rapid flow of slurry in the separation discharge channel 44 to the discharge area 42, thereby enabling the slurry to be discharged quickly. When grinding media enter the separation discharge channel 44, the grinding media has a high density and is difficult to be discharged. However, due to the rapid rotation of the separation wheel mechanism, the grinding media can easily leave the separation discharge channel 44 and return to the grinding area under the action of centrifugal force. In other words, the small inlet of the separation discharge channel 44 does not affect the return of the grinding media in the separation discharge channel 44 to the grinding area.

[0038] In this embodiment, by setting the separating wheel mechanism 4, on the one hand, there is no need to set a screen at the outlet of the vertical sand mill, which effectively avoids the screen from getting clogged; on the other hand, the separating wheel mechanism 4 can effectively separate the grinding slurry and the grinding media, and ensure the discharge rate of the grinding slurry.

[0039] Furthermore, such as Figure 1-4 As shown, the separating protrusion 43 includes a first arcuate surface 431, a second arcuate surface 432, and a connecting curved surface 433 connected in sequence. The first arcuate surface 431 and the second arcuate surface 432 both extend along the direction from the center to the edge of the separating wheel seat 41. The connecting curved surface 433 is located near the edge of the separating wheel seat 41. Along the rotation direction of the separating wheel seat 41, the second arcuate surface 432 of one separating protrusion 43 and the first arcuate surface 431 of the next separating protrusion 43 form the separating discharge channel 44. Preferably, the radius of curvature of the first arcuate surface 431 is greater than or equal to the radius of curvature of the second arcuate surface 432.

[0040] In this embodiment, by setting arc-shaped surfaces on both sides of the separation discharge channel 44, and the radii of curvature of the arc-shaped surfaces on the two sides being different, the radius of curvature of the separation discharge channel 44 on the rotation direction side (i.e., the first arc-shaped surface 431) is not less than the radius of curvature of the other side (i.e., the second arc-shaped surface 432). When the material flow rate is the same, the centrifugal force is greater on the side with a smaller radius of curvature (i.e., the second arc-shaped surface 432), and the centrifugal motion tendency of the material is more significant at that point. Furthermore, the separation discharge channel 44 gradually expands from the outside to the inside. According to the law of conservation of mass, the formula for calculating centrifugal force and linear velocity, the closer the material is to the outside of the separation discharge channel 44, the greater the centrifugal force. The faster the material flow rate, the more the material flowing along the side with the smaller radius of curvature (i.e., the second arc surface 432) undergoes centrifugal motion towards the direction of rotation. When the material in the outer peripheral area of ​​the separating wheel carries a small portion of the grinding media and moves inward in the direction of the discharge zone 42 along the curve of the first and second arc surfaces 432 under the action of the Coanda effect, the centrifugally moving material and the inwardly moving material converge. Under the action of drag and relative pressure difference, the small portion of the grinding media carried by the material is continuously peeled off and separated, preventing the grinding media from flowing into the discharge zone 42, further realizing the complete separation of the grinding media and the material, and further reducing the probability of ball running.

[0041] Furthermore, such as Figure 3-4 As shown, along the rotation direction of the separating wheel seat 41, the connecting surface 433 sequentially includes a small rounded surface 4331, a third arcuate surface 4332, and a large rounded surface 4333. The small rounded surface 4331 is connected to the end of the first arcuate surface 431 away from the center position, and the large rounded surface 4333 is connected to the end of the second arcuate surface 432 away from the center position. Preferably, the projections of the first arcuate surface 431, the second arcuate surface 432, and the third arcuate surface 4332 onto the horizontal plane are the first arcuate line, the second arcuate line, and the third arcuate line, respectively. In the same separating protrusion 43, the distance d1 between the point C on the third arcuate line that is longest between it and the rotation center X of the separating wheel seat 41 and the outer endpoint A of the first arcuate line is greater than the distance d2 between it and the outer endpoint B of the second arcuate line.

[0042] In this embodiment, point C, which has the longest distance between the third arc line and the rotation center X, is actually the point with the highest linear velocity on the third arc surface. The distance d1 between point C and the outer endpoint A of the first arc line is greater than the distance d2 between point C and the outer endpoint B of the second arc line. That is, point C is located close to the large rounded surface 4333, thereby forming a curvature peeling protrusion structure on the outer side of the third arc surface 4332 of each separation protrusion 43. When the material on the outer periphery of the separation wheel mechanism 4 flows through the third arc surface 4332, the grinding media and large particle size... Under the action of centrifugal force, the material particles are easily separated from the separating wheel mechanism 4 at point C in advance. Under the action of Coanda effect, the small-diameter material flows in the form of a liquid film along the third arc surface 4332 toward the separation discharge channel 44, and flows out to the discharge area 42 through the separation discharge channel 44. The early separation of the grinding media and the large-diameter material particles can effectively reduce the proportion of grinding media in the slurry entering the separation discharge channel 44, and effectively prevent the grinding media on the outer periphery of the separating wheel mechanism 4 from approaching the separation area, thereby realizing the classification and pre-separation functions.

[0043] Furthermore, within the same separating protrusion 43, the distance d3 between the curvature center O of the third arc line and the outer endpoint A of the first arc line is less than the distance d4 between the curvature center O of the third arc line and the outer endpoint B of the second arc line.

[0044] In this embodiment, by setting the relationship between the distance d3 between the curvature center O of the third arc and the outer endpoint A of the first arc, and the distance d4 between the curvature center O of the third arc and the outer endpoint B of the second arc, the ratio of the arc lengths of the first arc surface 431 and the second arc surface 432, as well as the ratio of the curvature radii of the small rounded surface 4331 and the large rounded surface 4333, are restricted. Specifically, the longer arc length of the first arc surface 431 helps to provide a larger division. The separation efficiency of the separation wheel mechanism 4 is improved by removing the dynamic pressure. The arc length of the second arc surface 432 is shorter, which helps to reduce the frictional resistance of the grinding slurry flowing out of the discharge zone 42 and increase the outflow rate of the grinding slurry. The radius of curvature of the large rounded surface 4333 determines the position of the maximum separation point where the grinding medium flows into the separation wheel mechanism 4 at the outer end inlet of the separation discharge channel 44. The radius of curvature of the small rounded surface 4331 determines the film thickness of the grinding slurry flowing in liquid film form at the outer end inlet of the separation discharge channel 44 under the action of the Coanda effect.

[0045] Furthermore, such as Figure 1 and 3 As shown, a fixing ring 45 is provided in the discharge area 42, and a plurality of fixing countersunk holes 46 are provided in the separation wheel seat 41 located inside the fixing ring 45; the separation protrusion 43 and the separation wheel seat 41 are detachably connected.

[0046] In this embodiment, by providing a fixing ring 45 and a countersunk hole 46 for fixing in the discharge zone 42, it is convenient to fix an external discharge mechanism, such as the main shaft 6, in the discharge zone 42, so that the grinding slurry flowing from the separation discharge channel 44 to the discharge zone 42 is discharged outward from the external discharge mechanism. Furthermore, by providing a detachable connection between the separation protrusion 43 and the separation wheel seat 41, on the one hand, the separation wheel seat 41 and the separation protrusion 43 can be processed separately, greatly reducing the processing difficulty of the separation wheel mechanism 4; on the other hand, since the separation protrusion 43 will collide with the grinding media, it is easy for the separation protrusion 43 to wear; when a certain separation protrusion 43 wears out, only the separation protrusion 43 needs to be replaced, without replacing the entire separation wheel mechanism 4, thus extending the service life of the entire separation wheel mechanism 4 and reducing production costs.

[0047] Furthermore, such as Figure 2 As shown, the bottom surface of the separating wheel seat 41 is uniformly provided with a plurality of strip-shaped propulsion protrusions 47 around the center position. Along the rotation direction of the separating wheel seat 41, each strip-shaped propulsion protrusion 47 has a first inclined plane 472 on its front side and a vertical plane 471 on its back side. The vertical plane 471 is perpendicular to the bottom surface of the separating wheel seat 41 and is set at an angle to the radial direction of the separating wheel seat 41. The first inclined plane 472 is set at an angle to the bottom surface of the separating wheel seat 41.

[0048] In this embodiment, by setting a strip-shaped propulsion protrusion 47, when the separation wheel mechanism 4 rotates, along the rotation direction, the first inclined plane 472 of the strip-shaped propulsion protrusion 47 imparts radial and circumferential tangential velocity components to the material and grinding media, thereby driving the material and grinding media at the bottom of the grinding area to circulate inside the grinding cylinder 2, increasing the collision frequency between the grinding media, that is, improving the grinding efficiency, and avoiding the formation of a grinding dead zone at the bottom of the grinding cylinder 2.

[0049] Example 2

[0050] like Figure 5-7As shown, the present invention also provides a screenless vertical sand mill, which has a separating wheel mechanism 4 as described in any one of Embodiment 1. The screenless vertical sand mill also includes a grinding cylinder 2, a main shaft 6 rotatably connected to the grinding cylinder 2, and a drive mechanism 5 for driving the main shaft 6 to rotate. A grinding rotor 3 is disposed inside the grinding cylinder 2. The grinding rotor 3 includes a top wall 34 and a side wall 35 connected to the outer edge of the top wall 34. The side wall 35 is cylindrical. The interior of the grinding rotor 3... A grinding cavity 31 is provided, and several counter-directional variable diameter channels 33 are provided through the side wall 35. The separating wheel mechanism 4 is disposed in the grinding cavity 31. A main shaft discharge channel 61 is provided inside the main shaft 6. The bottom end of the main shaft 6 passes through the top wall of the grinding cylinder 2 and the top wall 34 of the grinding cavity 31 in sequence and extends to the discharge area 42 of the separating wheel mechanism 4. The main shaft discharge channel 61 is connected to the discharge area 42. The grinding rotor 3 and the separating wheel mechanism 4 rotate synchronously with the main shaft 6. Specifically, the drive mechanism 5 includes a motor 51, a first pulley 52 connected to the output end of the motor 51, and a second pulley 53 sleeved on the outside of the main shaft 6. The first pulley 52 and the second pulley 53 are connected by a synchronous belt. In other embodiments, the drive mechanism 5 can also be other types of drive mechanisms, which will not be described in detail here. In addition, a feeding mechanism 9 is provided at the upper end of the grinding cylinder 2, which is connected to the interior of the grinding cylinder 2. The feeding mechanism 9 feeds grinding media and grinding materials into the interior of the grinding cylinder 2. A discharge port is also provided at the bottom of the grinding cylinder 2. When it is necessary to clean the interior of the grinding cylinder 2, the discharge port can be opened to discharge the residue and grinding media inside the grinding cylinder 2. The screenless vertical sand mill also includes a frame 10, on which the grinding cylinder 2, the main shaft 6, and the drive mechanism 5 are all mounted.

[0051] In actual operation, the drive mechanism 5 drives the main shaft 6 to rotate rapidly, thereby driving the grinding rotor 3 and the separation wheel mechanism 4 to rotate synchronously. The rotation of the grinding rotor 3 and the separation wheel mechanism 4 drives the grinding material and grinding media inside the grinding cylinder 2 to move, thereby driving the grinding media to perform high-frequency impact, shearing and friction on the grinding material, thus achieving grinding of the material. The grinding material, grinding slurry and grinding media enter the grinding cavity 31 through the counter-directional variable diameter channel 33. Since the separation discharge channel 44 gradually expands from the outside to the inside, that is, the inlet is smaller and the outlet is larger, when the separation wheel mechanism 4 rotates rapidly, the dynamic pressure at the inlet of the separation discharge channel 44 increases, which increases the resistance that the grinding media needs to overcome to flow into the separation discharge channel 44, thereby effectively reducing the probability of the grinding media flowing into the separation discharge channel 44 from the inlet in the grinding area. Moreover, the slurry enters the separation discharge channel 44. Subsequently, the width of the separation discharge channel 44 gradually increases, which facilitates the rapid flow of the slurry in the separation discharge channel 44 to the discharge area 42. The slurry flowing to the discharge area 42 enters the main shaft discharge channel 61 and is discharged outward along the main shaft discharge channel 61. A small amount of grinding media will enter the separation discharge channel 44 and flow with the grinding slurry to the main shaft discharge channel 61. Due to the long length and vertical installation of the main shaft discharge channel 61, the grinding media is difficult to be discharged outward through the main shaft discharge channel 61 under the action of gravity and viscosity. The grinding media in the main shaft discharge channel 61 eventually falls back into the separation discharge channel 44. Due to the rapid rotation of the separation wheel mechanism, the grinding media can easily leave the separation discharge channel 44 and return to the grinding cavity 31 under the action of centrifugal force. That is, the small inlet of the separation discharge channel 44 does not affect the return of the grinding media in the separation discharge channel 44 to the grinding area.

[0052] In this embodiment, on the one hand, by setting a separation wheel mechanism 4 at the outlet of the vertical sand mill, the grinding slurry and grinding media are effectively separated, and the discharge rate of the grinding slurry is guaranteed; on the other hand, by setting a long and vertically installed main shaft discharge channel 61, the grinding media is difficult to be discharged outward through the main shaft discharge channel 61 under the action of gravity and viscosity, thereby further realizing the effective separation of the grinding slurry and grinding media.

[0053] Furthermore, such as Figure 5 , 8As shown in Figure -9, the system also includes a discharge cylinder 7. The top end of the main shaft 6 extends into the interior of the discharge cylinder 7. The top end of the main shaft discharge channel 61 penetrates the top wall of the main shaft 6 to communicate with the interior of the discharge cylinder 7. Several discharge connection channels 62, communicating with the main shaft discharge channel 61, are evenly arranged along the outer periphery of the main shaft discharge channel 61 at the bottom of the main shaft 6. The ends of the several discharge connection channels 62 away from the main shaft discharge channel 61 extend downwards at an angle relative to the central axis of the main shaft 6 and penetrate the side wall of the main shaft 6. The projections of the several discharge connection channels 62 on the horizontal plane form an angle with the radial direction of the main shaft 6. Specifically, a discharge through hole 71 is provided on the side wall of the discharge cylinder 7.

[0054] In this embodiment, 3-4 discharge connection channels 62 are uniformly arranged around the side wall of the main shaft 6. The grinding slurry flowing to the discharge area 42 of the separation wheel mechanism 4 can enter the main shaft discharge channel 61 through several discharge connection channels 62, thereby increasing the discharge rate of the grinding slurry. Furthermore, the several discharge connection channels 62 are inclined upwards, which, compared to being arranged horizontally, helps to increase the resistance of the grinding media from the discharge connection channels 62 into the main shaft discharge channel 61, further reducing the probability of the grinding media entering the main shaft discharge channel 61. It also facilitates the grinding media falling back from the discharge connection channels 62 into the separation wheel mechanism 4 under the action of gravity, further improving the separation effect between the grinding slurry and the grinding media. In addition, when the screenless vertical sand mill is started, some grinding media may flow into the discharge connection channel 62 and the main shaft discharge channel 61. After the machine is started, the material and grinding media will be given a rotational circumferential speed component when they flow through the discharge connection channel 62. Under the action of drag and gravity, they fall back into the separation wheel mechanism 4, thereby avoiding the occurrence of ball running phenomenon during the start-up operation.

[0055] Furthermore, such as Figure 8-9 As shown, the main shaft discharge channel 61 includes, from top to bottom, a large-diameter section 611, a transition section 612, and a small-diameter section 613. A pressure sensor 11 is installed at the top of the discharge cylinder 7, and the detection end of the pressure sensor 11 passes through the top of the discharge cylinder 7 and extends into the interior of the large-diameter section 611. In this embodiment, by setting the transition section 612 and the large-diameter section 611 near the outlet of the main shaft discharge channel 61, on the one hand, it facilitates the provision of installation space for the detection end of the pressure sensor 11, which is used to detect the pressure in the main shaft discharge channel 61 in real time; on the other hand, the inner diameter of the transition section 612 gradually increases relative to the inner diameter of the small-diameter section 613. When the inner diameter increases, the flow rate of the grinding slurry slows down, thereby increasing the viscous resistance of the grinding media rising with the grinding slurry and reducing the movement speed of the grinding media. This makes it easier for the grinding media to fall back under its own gravity, further effectively reducing the possibility of the grinding media being discharged outward.

[0056] Furthermore, such as Figure 8-9 As shown, a baffle 8 is fixed at the top of the main shaft 6, and a baffle through hole 81 communicating with the main shaft discharge channel 61 is opened in the middle of the baffle 8. The inner diameter of the baffle through hole 81 decreases from bottom to top. Specifically, the inner diameter of the lower end of the baffle through hole 81 is the same as the inner diameter of the upper end of the large diameter section 611, while the inner diameter of the upper end of the baffle through hole 81 is smaller than the inner diameter of the lower end of the baffle through hole 81. This causes the inner wall of the baffle through hole 81 to be inclined from the outside to the inside. When a small amount of grinding media enters the main shaft discharge channel 61, most of the grinding media falls to the bottom of the main shaft discharge channel 61 under its own gravity and falls back to the separation wheel mechanism 4 through the discharge connection channel 62. A very small amount of grinding media will spiral up along the side wall of the main shaft discharge channel 61 to the top of the main shaft discharge channel 61 under the rotation of the main shaft 6. At this time, the inclined inner wall of the baffle through hole 81 of the baffle 8 can effectively block this part of the grinding media, preventing the grinding media from leaving the main shaft discharge channel 61 and entering the discharge cylinder 7, thereby achieving complete separation of the grinding slurry and the grinding media and eliminating the possibility of the grinding media being discharged outward.

[0057] Furthermore, such as Figure 10-11 As shown, a plurality of grinding rods 32 are provided on the outer periphery of the sidewall 35 of the grinding rotor 3. At least some of the grinding rods 32 have a second inclined plane 320 on the facing side along the rotation direction of the grinding rotor 3. The second inclined plane 320 is set at an angle to the horizontal plane. In this embodiment, by providing a plurality of grinding rods 32, and at least some of the grinding rods 32 having a second inclined plane 320 on the facing side along the rotation direction of the grinding rotor 3, when the grinding rotor 3 rotates, the second inclined plane 320 imparts velocity components to the grinding medium and grinding material along the circumferential and vertical directions of the grinding rotor 3, thereby increasing the grinding collision frequency and internal circulation speed between the grinding medium and the material, effectively improving the grinding efficiency.

[0058] Furthermore, such as Figure 10-11As shown, each of the opposite-direction diameter changing channels 33 gradually narrows from the inside out; each of the opposite-direction diameter changing channels 33 includes a top surface 331, a first side surface 332, a bottom surface 333, and a second side surface 334 connected in sequence, with the top surface 331 and the bottom surface 333 arranged at an angle. Specifically, the bottom surface 333 is parallel to the horizontal plane, and the top surface 331 is inclined downwards from the inside out, thereby making the opposite-direction diameter changing channel 33 gradually narrow from the inside out; the first side surface 332 and the second side surface 334 can be arranged parallel to each other or at an angle. In this embodiment, by providing several counter-directional variable diameter channels 33 on the sidewall 35, the grinding media and grinding materials flow from the inner grinding cavity 31 to the outer grinding cavity (specifically, the outer grinding cavity is the cavity between the outer periphery of the grinding rotor 3 and the inner wall of the grinding cylinder 2) through the counter-directional variable diameter channels, thus facilitating the formation of local circulation. Furthermore, since the counter-directional variable diameter channels 33 gradually narrow from the inside to the outside, the probability of the grinding media in the outer grinding cavity entering the inner grinding cavity 31 is effectively reduced. At the same time, the speed at which the grinding media and large-diameter material particles in the inner grinding cavity 31 flow out to the outer grinding cavity is accelerated, thereby playing a certain role in classification and separation. This helps to improve the separation effect between the material and the grinding media, and effectively shortens the local circulation cycle of the grinding media, avoiding the accumulation of grinding media to form grinding dead zones and improving the grinding uniformity.

[0059] Furthermore, such as Figure 10-11 As shown, the first side surface 332 and the second side surface 334 are arranged parallel to each other, and the projection of the first side surface 332 on the horizontal plane is at an angle to the radial direction of the side wall 35. In this embodiment, by setting the orientation of the anisotropic diameter channel 33 at a certain angle to the radial direction of the grinding rotor 3, it is beneficial to separate the grinding media and large-diameter material particles close to the side wall 35 in the grinding inner cavity 31 into the grinding outer cavity, thereby playing a certain role in classification and separation; and setting the first side surface 332 and the second side surface 334 parallel facilitates the processing of the anisotropic diameter channel 33 in actual production.

[0060] Furthermore, such as Figure 10-11As shown, the grinding rods 32 are evenly arranged in multiple rows on the outer periphery of the sidewall 35. Each row of grinding rods 32 is positioned between two adjacent anisotropic variable diameter channels 33, and each row of grinding rods 32 includes an upper rod, a middle rod, and a lower rod arranged sequentially from top to bottom. In this embodiment, by setting a row of grinding rods 32 between two adjacent anisotropic variable diameter channels 33, when the grinding media and grinding material flow out from the anisotropic variable diameter channels 33 to the outer periphery of the grinding rotor 3, the grinding rods 32 energize and divert them along the second inclined plane 320 on the facing side of the rotation direction, and flow into the channel between the upper and lower adjacent grinding rods 32. Under the continuous energization of the sidewall surface in the vertical direction of the grinding rods 32, the grinding media velocity scalar and spin angular velocity are increased, thereby effectively increasing the collision frequency between the grinding media and thus improving the grinding efficiency of the sand mill.

[0061] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A separating wheel mechanism, characterized in that: The separating wheel mechanism (4) includes a separating wheel seat (41). The center of the top of the separating wheel seat (41) is the discharge area (42). Multiple separating protrusions (43) are evenly arranged around the top of the separating wheel seat (41) around the discharge area (42). A separating discharge channel (44) communicating with the discharge area (42) is formed between adjacent separating protrusions (43). The separating discharge channel (44) is curved and gradually expands from the outside to the inside. The separating protrusions (43) include sequentially connected The first arc surface (431), the second arc surface (432), and the connecting surface (433) are provided. The first arc surface (431) and the second arc surface (432) extend along the direction from the center position to the edge position of the separating wheel seat (41), respectively. The connecting surface (433) is located near the edge position of the separating wheel seat (41). Along the rotation direction of the separating wheel seat (41), the second arc surface (432) in one separating protrusion (43) and the first arc surface (432) in the next separating protrusion (43) are connected. The separation discharge channel (44) is formed between 31); the radius of curvature of the first arc surface (431) is greater than or equal to the radius of curvature of the second arc surface (432); along the rotation direction of the separation wheel seat (41), the connecting surface (433) sequentially includes a small rounded surface (4331), a third arc surface (4332), and a large rounded surface (4333), the small rounded surface (4331) is connected to the end of the first arc surface (431) away from the center position, and the large rounded surface (4333) is connected to the second arc surface (432). The end of the surface (432) away from the center position is connected; the projections of the first arc surface (431), the second arc surface (432) and the third arc surface (4332) on the horizontal plane are the first arc line, the second arc line and the third arc line, respectively. In the same separation protrusion (43), the distance between the point (C) on the third arc line that is the longest distance from the rotation center (X) of the separation wheel seat (41) and the distance (d1) between the outer end point (A) of the first arc line is greater than the distance (d2) between the point (C) and the outer end point (B) of the second arc line.

2. The separating wheel mechanism according to claim 1, characterized in that: In the same separating bump (43), the distance (d3) between the curvature center (O) of the third arc line and the outer end point (A) of the first arc line is less than the distance (d4) between the curvature center (O) of the third arc line and the outer end point (B) of the second arc line.

3. The separating wheel mechanism according to claim 1, characterized in that: A fixing ring (45) is provided in the discharge area (42), and a number of fixing countersunk holes (46) are provided in the separation wheel seat (41) located inside the fixing ring (45); the separation protrusion (43) and the separation wheel seat (41) are detachably connected.

4. The separating wheel mechanism according to claim 1, characterized in that: The bottom surface of the separating wheel seat (41) is uniformly provided with a plurality of strip-shaped propulsion protrusions (47) around the center position. Along the rotation direction of the separating wheel seat (41), each strip-shaped propulsion protrusion (47) has a first inclined plane (472) on its front side and a vertical plane (471) on its back side. The vertical plane (471) is perpendicular to the bottom surface of the separating wheel seat (41) and the vertical plane (471) is set at an angle to the radial direction of the separating wheel seat (41). The first inclined plane (472) is set at an angle to the bottom surface of the separating wheel seat (41).

5. A screenless vertical sand mill, characterized in that: The screenless vertical sand mill has a separating wheel mechanism (4) as described in any one of claims 1-4. The screenless vertical sand mill also includes a grinding cylinder (2), a main shaft (6) rotatably connected to the grinding cylinder (2), and a drive mechanism (5) for driving the main shaft (6) to rotate. A grinding rotor (3) is provided inside the grinding cylinder (2). The grinding rotor (3) includes a top wall (34) and a side wall (35) connected to the outer edge of the top wall (34). The side wall (35) is cylindrical. A grinding cavity (31) is provided inside the grinding rotor (3). A number of opposite diameter-changing channels (33) are provided through the side wall (35), and the separation wheel mechanism (4) is set in the grinding cavity (31); the main shaft (6) has a main shaft discharge channel (61) inside, and the bottom end of the main shaft (6) passes through the top wall of the grinding cylinder (2) and the top wall (34) of the grinding cavity (31) in sequence and extends to the discharge area (42) of the separation wheel mechanism (4). The main shaft discharge channel (61) is connected to the discharge area (42); the grinding rotor (3) and the separation wheel mechanism (4) both rotate synchronously with the main shaft (6).

6. A screenless vertical sand mill according to claim 5, characterized in that: It also includes a discharge cylinder (7), the top end of the main shaft (6) extends into the interior of the discharge cylinder (7), the top end of the main shaft discharge channel (61) penetrates the top wall of the main shaft (6) to communicate with the interior of the discharge cylinder (7), and a plurality of discharge connection channels (62) communicating with the main shaft discharge channel (61) are evenly arranged along the outer periphery of the main shaft discharge channel (61) at the bottom of the main shaft (6). The ends of the plurality of discharge connection channels (62) away from the main shaft discharge channel (61) are all inclined downward relative to the central axis of the main shaft (6) and penetrate the side wall of the main shaft (6). The projection of the plurality of discharge connection channels (62) on the horizontal plane is set at an angle to the radial direction of the main shaft (6).

7. A screenless vertical sand mill according to claim 6, characterized in that: A baffle (8) is fixed at the top of the main shaft (6). A baffle through hole (81) communicating with the main shaft discharge channel (61) is opened in the middle of the baffle (8). The inner diameter of the baffle through hole (81) decreases from bottom to top.

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