A grinding paddle, a grinding paddle and a sand mill

Abstract

The application discloses a grinding paddle, a grinding paddle and a sand mill, relates to the technical field of material grinding equipment, and relates to a grinding paddle which comprises a paddle body, the paddle body is formed with a plurality of shearing parts which do not penetrate the paddle body in the axial direction, the plurality of shearing parts are inscribed in the same rotating circumference, and adjacent two shearing parts are connected to each other to form a shearing surface with a thickness S in the circumferential direction of the paddle body; and the shearing surface is a continuous plane. The thickness of the shearing surface is designed in connection with the circumferential diameter of the paddle, so that the structure of the paddle is stable and durable, and the paddle can provide greater shearing force during rotation. The grinding paddle and the grinding paddle are designed not to penetrate in the axial direction, so that the material cannot penetrate the paddle by using the structure of the paddle itself, and the angle of the rotating circumference is evenly distributed by each group of grinding paddles, so that each grinding paddle can realize multiple shearing effects, and the sand mill provided with the grinding paddle has the characteristics of high shearing rate and high ejection amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material grinding equipment, in particular to a grinding paddle, a grinding paddle and a sand mill. BACKGROUND

[0002] The sand mill is a device for grinding small particles, and its working principle is that the high-hardness spherical beads (usually made of zirconia) collide, shear and extrude each other to grind the soft and brittle slurry into micron-sized particles.

[0003] During the grinding process, the slurry and the spherical beads enter the grinding inner cavity of the grinding cylinder from the inlet, and are discharged from the outlet after grinding. During this period, the slurry and the spherical beads rely on the rotation of the grinding paddle to achieve shearing collision. However, due to the thin thickness of the existing grinding paddle, the grinding paddle is prone to breakage and lacks shearing force in the rotation path. Moreover, the existing grinding paddle is designed as a cylindrical shape, the grinding paddle has an arc surface structure in the circumferential direction, and the grinding paddle has an equal-diameter structure in the axial direction. The grinding paddle lacks shearing force change during rotation, which makes it difficult to achieve the best grinding effect. SUMMARY

[0004] The purpose of the present application is to provide a grinding paddle, a grinding paddle and a sand mill to solve the problems of easy breakage and lack of shearing force change during rotation of the existing grinding paddle.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A grinding paddle, comprising a paddle body, a transmission hole concentrically arranged with the center of rotation of the paddle body is arranged on the paddle body; a plurality of shearing parts not penetrating the axial direction of the paddle body are formed on the circumferential side of the transmission hole, the plurality of shearing parts are inscribed in the same rotation circumference, and in the circumferential direction of the paddle body, two adjacent shearing parts are connected to form a shearing surface with a thickness S; the shearing surface is a continuous plane, and the ratio between the thickness S of the shearing surface and the diameter D of the rotation circumference is 1:3-1:4.

[0007] In some embodiments, the cross-sectional outline of the paddle body is an equilateral triangle.

[0008] Based on the foregoing grinding paddle, the present application provides a grinding paddle, comprising a transmission shaft and a plurality of the foregoing grinding paddles, the transmission shaft is arranged in the transmission hole, the plurality of grinding paddles are arranged in the axial direction of the transmission shaft, and the adjacent two grinding paddles are in close contact with each other, so that the grinding paddle does not penetrate the axial direction of the transmission shaft.

[0009] In some embodiments, the adjacent two grinding paddles are arranged alternately, so that the shearing part of any grinding paddle protrudes from the shearing surface of the adjacent grinding paddle.

[0010] In some embodiments, a plurality of connecting holes are arranged on each paddle body and distributed circumferentially around the transmission hole; the connecting holes on two adjacent grinding paddles are in communication, and a connecting member is arranged in the plurality of interconnected connecting holes, so that the plurality of grinding paddles are connected in series in the axial direction of the transmission shaft.

[0011] In some embodiments, the number of grinding paddles is even.

[0012] In some embodiments, two grinding paddles form a group, and a plurality of groups of grinding paddles are arranged in sequence, and the shear portions of the grinding paddles in the same group are uniformly arranged in the rotation circumference.

[0013] Based on the foregoing grinding paddle, the present application further provides a sand mill, which comprises a grinding cavity, and the grinding paddles are arranged transversely in the grinding cavity, and a first gap is formed between the front end of the grinding paddle and the grinding cavity, and a second gap is formed between the rear end of the grinding paddle and the grinding cavity.

[0014] In some embodiments, the length of the first gap is equal to the length of the second gap.

[0015] In some embodiments, a third gap is formed between the circumferential outer edge of the grinding paddle and the grinding cavity, and the ratio of the length D of the third gap to the total length L of the paddle is 1:5.

[0016] Compared with the prior art, the grinding paddle, the grinding paddle and the sand mill implemented by the present application have the following beneficial effects:

[0017] (1) The thickness of the present grinding paddle is designed in association with the circumferential diameter of the paddle, so that the shear surface has sufficient shear area, the structure of the paddle is stable and durable, the paddle can maintain dynamic balance during rotation, and greater shear force can be provided;

[0018] (2) The present grinding paddle and the grinding paddle are designed to be axially non-penetrating, so that the material cannot penetrate the paddle by using the structure of the paddle itself, and the material is forced to flow circumferentially around the paddle, thereby increasing the time of shear collision of the material during grinding;

[0019] (3) The present grinding paddle evenly distributes the angle of the rotation circumference by each group of grinding paddles, so that each grinding paddle can achieve multiple shear effects when the transmission shaft rotates one revolution, thereby improving the shear efficiency of the grinding paddle on the material, and the sand mill configured with the present grinding paddle has the characteristics of high shear rate and high discharge amount. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the grinding paddle in Embodiment 1 of the present application;

[0021] Figure 2is a schematic view of a shear plane in Embodiment 1 of the present application;

[0022] Figure 3 is a schematic view of a grinding paddle in Embodiment 2 of the present application;

[0023] Figure 4 is a schematic view of the cooperation of adjacent paddle blades in Embodiment 2 of the present application;

[0024] Figure 5 is a schematic view of a sand mill in Embodiment 3 of the present application;

[0025] Figure 6 is a schematic view of a conventional grinding paddle.

[0026] In the figure, 1A, a paddle blade; 2A, a grinding paddle; 3A, a sand mill;

[0027] 1, a paddle body; 1a, a shear portion; 2a, a shear plane; 3a, a rotation circumference; 2, a transmission hole; 3, a transmission shaft; 4, a connecting hole; 5, a pin shaft; 6, a grinding cavity; 7, a transmission motor; 8, a transmission wheel; 9, a discharge pipe; 10, a first gap; 11, a second gap; 12, a third gap. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0029] In the description of the present application, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "mount", "connect", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "height", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like in the present application are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0032] Example 1

[0033] like Figures 1-2 As shown, Embodiment 1 of the present invention provides a grinding blade 1A, which includes a blade body 1. The outer contour of the cross-section of the blade body 1 is an equilateral triangle. A transmission hole 2 is provided on the blade body 1, which is concentrically arranged with its own rotation center. Around the transmission hole 2, the blade body 1 forms three shearing portions 1a that do not penetrate the axial direction of the blade body 1. The three shearing portions 1a are tangent to the same rotation circumference 3a. Moreover, in the circumferential direction of the blade body 1, two adjacent shearing portions 1a are connected to each other to form a shearing surface 2a with a thickness of S.

[0034] It should be noted that the transmission hole 2 provided on the blade body 1 is generally used to install the rotating shaft to drive the grinding blade 1A to rotate. Therefore, the rotation center of the blade body 1 will generally fall on the central axis of the rotating shaft, so that when the rotating shaft rotates, it can drive the grinding blade 1A to rotate smoothly.

[0035] In this embodiment 1, the shearing portion 1a on the blade body 1 is designed to not penetrate axially. Specifically, in one example, none of the shearing portions 1a have through holes, ensuring that the slurry cannot penetrate the blade body 1 axially. Therefore, when this grinding blade 1A is placed inside the grinding chamber 6, the slurry can only collide and shear with the end face of the blade body 1 in the axial direction, and cannot pass through the blade body 1. It should be noted that the aforementioned axial direction refers to the axial direction of the blade body 1, that is, the direction of the axis around which the blade body 1 rotates.

[0036] In this embodiment 1, the shearing portions 1a of the grinding blade 1A are evenly distributed around the circumference of the transmission hole 2, and the outermost edge of the shearing portion 1a extending outward toward the blade body 1 is the outermost end of the grinding blade 1A. The rotation circumference 3a of the grinding blade 1A is constructed with the distance between the outermost end of the grinding blade 1A and the rotation center of the blade body 1 as the radius and the rotation center of the blade body 1 as the center. The outermost edges of the shearing portions 1a of the grinding blade 1A are all internally tangent to this rotation circumference 3a, enabling the grinding blade 1A to maintain dynamic balance during rotation.

[0037] like Figure 2As shown in the embodiment 1, the shearing surface 2a is a continuous plane, and the ratio between the thickness S of the shearing surface 2a and the diameter D of the rotating circumference 3a is 1:3-1:4, so that the shearing part 1a of the grinding paddle 1A has a large thickness, which not only ensures the sufficient strength of the grinding paddle 1A in the circumferential direction to avoid the rapid wear of the grinding paddle 1A, but also increases the shearing surface 2a of the rotating grinding paddle 1A, so that the grinding paddle 1A can produce a large disturbance effect when rotating in the slurry, thereby improving the grinding and shearing effect of the grinding paddle 1A on the slurry.

[0038] It should be noted that the cross-sectional outer contour of the paddle body 1 can also adopt other contour designs, and the equilateral triangle is only one of the example schemes. When the grinding paddle 1A adopts other contour designs, the shearing part 1a needs to remain axially non-penetrating, and the ratio between the thickness S of the shearing surface 2a and the diameter D of the rotating circumference 3a needs to be maintained within the range of 1:3-1:4, so as to ensure that the slurry cannot penetrate the paddle body 1 in the axial direction, and the paddle can maintain dynamic balance during rotation, and each shearing part 1a can produce a large disturbance shearing effect.

[0039] Embodiment 2

[0040] As shown in the embodiment 1, the shearing surface 2a is a continuous plane, and the ratio between the thickness S of the shearing surface 2a and the diameter D of the rotating circumference 3a is 1:3-1:4, so that the shearing part 1a of the grinding paddle 1A has a large thickness, which not only ensures the sufficient strength of the grinding paddle 1A in the circumferential direction to avoid the rapid wear of the grinding paddle 1A, but also increases the shearing surface 2a of the rotating grinding paddle 1A, so that the grinding paddle 1A can produce a large disturbance effect when rotating in the slurry, thereby improving the grinding and shearing effect of the grinding paddle 1A on the slurry. Figures 3-4 The grinding paddle 2A provided in the embodiment 2 based on the grinding paddle 1A provided in the embodiment 1 comprises a transmission shaft 3 and a plurality of grinding paddles 1A of the embodiment 1, wherein the transmission shaft 3 is arranged in the transmission hole 2 of each grinding paddle 1A, so that the plurality of grinding paddles 1A are arranged in the axial direction of the transmission shaft 3. Adjacent two grinding paddles 1A are in close contact with each other, so that the grinding paddle 2A does not penetrate in the axial direction of the transmission shaft 3.

[0041] The transmission shaft 3 is driven to rotate by an external power output. Since the transmission shaft 3 is arranged in the transmission hole 2 and is located at the rotation center of each grinding paddle 1A, the rotation of the transmission shaft 3 can stably rotate each grinding paddle 1A.

[0042] In the embodiment 2, adjacent two grinding paddles 1A are in close contact with each other, that is, the rear end surface of the previous grinding paddle 1A is in close contact with the front end surface of the next grinding paddle 1A, so that no spacing is provided between the plurality of grinding paddles 1A arranged in the axial direction of the transmission shaft 3. When the grinding paddle 2A is arranged in the grinding cavity 6, the slurry can only collide with the end surface of the grinding paddle 2A in the axial direction of the grinding paddle 2A to produce a collision shearing effect, and cannot pass through the grinding paddle 2A.

[0043] In order to enable the plurality of grinding blades 1A to be connected in series on the transmission shaft 3, the blade body 1 can be provided with three connecting holes 4 distributed circumferentially around the transmission hole 2, and the three connecting holes 4 are uniformly arranged in the circumferential direction of the transmission hole 2. Moreover, the connecting holes 4 on adjacent two grinding blades 1A are correspondingly connected, and a plurality of mutually connected connecting holes 4 are collectively provided with a pin 5 as a connecting member, so that the plurality of grinding blades 1A are connected in series in the axial direction of the transmission shaft 3.

[0044] It should be noted that in each grinding blade 1A, the relative positional relationship between any one connecting hole 4 and the transmission hole 2 is the same, so that the connecting holes 4 on adjacent two grinding blades 1A are correspondingly connected. In this embodiment 2, a plurality of mutually connected connecting holes 4 form three channels through the grinding blade 2A, and the axial direction of the channels is parallel to the axial direction of the transmission hole 2. Since the pin 5 is arranged in the channel and fills the channel, the channel cannot serve as a space for the flow of slurry, and the slurry cannot pass through the grinding blade 2A through the channel formed by the plurality of mutually connected connecting holes 4.

[0045] In order to maintain the dynamic balance of the grinding blade 2A during rotation, the number of grinding blades 1A in this embodiment 2 can be an even number. Moreover, each two grinding blades 1A form a group, and a plurality of groups of grinding blades 1A are arranged in sequence. In the same group of grinding blades 1A, adjacent two grinding blades 1A are arranged alternately, and the shear portions 1a of the same group of grinding blades 1A are uniformly arranged in the rotating circumference 3a. Specifically, in this embodiment 2, the same group of two grinding blades 1A form an included angle of 60° in the circumferential direction, so that the six shear portions 1a of the two grinding blades 1A are arranged at an included angle of 60° from each other, so that the shear portion 1a of any grinding blade 1A protrudes from the shear surface 2a of the adjacent grinding blade 1A, and when the grinding blade 2A rotates, a group of grinding blades 1A will exert a shearing force on the area in the circumferential direction of the grinding blade 2A at a single time point, so that the circumferential direction of the grinding blade 2A can be sheared by the grinding blade 2A.

[0046] Moreover, when the grinding blade 2A rotates in the grinding cavity 6, the two grinding blades 1A in the same group of grinding blades 1A will respectively exert a shearing force on different areas in the circumferential direction of the grinding blade 2A at a single time point, i.e., the shear surface 2a of each grinding blade 1A will exert a shearing force on the current position, and since adjacent two grinding blades 1A are arranged alternately, the shearing force exerted on each part of the grinding blade 2A in the circumferential direction will be different, so that the grinding blade 2A can destroy the laminar flow of the slurry formed in the circumferential direction of the grinding blade 2A, and increase the collision and shearing frequency of the slurry and the spherical beads.

[0047] Embodiment 3

[0048] As Figure 5As shown, the embodiment 3 is based on the grinding paddle 2A provided in the embodiment 2, and provides a sand mill 3A including a grinding cavity 6, and the grinding paddle 2A is arranged in the grinding cavity 6 in a transverse manner. A driving motor 7 and a driving wheel 8 are arranged outside the grinding cavity 6 to rotate the grinding paddle 2A. One end of the grinding cavity 6 is communicated with a discharge pipe 9 to discharge the ground slurry.

[0049] Based on the total length L of the paddle of the grinding paddle 2A, a first gap 10 is formed between the front end of the grinding paddle 2A and the grinding cavity 6 in the axial direction of the grinding paddle 2A, and a second gap 11 is formed between the rear end of the grinding paddle 2A and the grinding cavity 6. The length of the first gap 10 can be equal to the length of the second gap 11. According to the processing capacity of the sand mill 3A, a third gap 12 is formed between the circumferential outer edge of the grinding paddle 2A and the grinding cavity 6, and the length of the third gap 12 is D.

[0050] It should be noted that, based on the processing capacity of the grinding cavity 6 and the dynamic balance of the grinding paddle 1A, the values of the total length L of the paddle of the grinding paddle 2A and the length D of the third gap 12 reflect the slurry filling rate in the grinding cavity 6. The ratio between the length D of the third gap 12 and the total length L of the paddle of the grinding paddle 2A is kept at 1:5, which can not only ensure the processing capacity of the grinding cavity 6, but also ensure the actual processing capacity of the grinding paddle 2A, so that the sand mill 3A can meet the requirements of high discharge capacity and high material circulation rate.

[0051] In order to verify that the sand mill 3A provided in the embodiment 3 adopts the aforementioned grinding paddle 2A, and the total length L of the paddle, the length D of the third gap 12, the length of the first gap 10 and the length of the second gap 11 meet the above design, the shear rate, discharge flow and material circulation rate of the sand mill 3A are all better than those of the existing sand mill adopting the existing grinding paddle. A group of tests are carried out, and reference is made to Table 1 and Table 2:

[0052] In Table 1 and Table 2, the existing sand mill adopts the existing grinding paddle as shown in Figure 6 The existing grinding paddle is composed of a plurality of thin paddle blades, and adjacent two paddle blades are arranged in a spaced manner, and each paddle blade is provided with a through hole arranged in a penetrating manner. The sand mill 3A of the embodiment 3 adopts the grinding paddle 2A as shown in Figure 3 The structure of the grinding paddle 2A is the same as that of the grinding paddle 2A of the embodiment 2.

[0053] The test method is as follows:

[0054] The effective processing capacity of the sand mill 3A is set to 90L, the diameter of the grinding cavity 6 is φ485mm, the inlet flow of the grinding cavity 6 is 1.25kg / s (i.e. 60L / min), the outlet pressure of the grinding cavity 6 is 0.3MPa, and the rotating speed of the grinding paddle 2A is 776rpm.

[0055] The material entering the inlet of the grinding cavity 6 is a negative electrode graphite slurry with a density p of 1250 kg / m 3 , a rheological constant k of 5.229 Pa s n, a rheological index n of 0.574, and a critical yield strength τ of 3.056 Pa. The filling amount of the negative electrode graphite slurry injected into the grinding cavity 6 reaches 700 mL, and the grinding starts.

[0056] Table 1

[0057]

[0058] Table 2

[0059] Existing grinding paddles (turbine paddles) Grinding paddle 2A (triangular paddle) Agitation power (kW) 10101.37 5308.95 Average shear stress (Pa) 158.58 489.58 Maximum shear stress (Pa) 2085.81 12454.77 Average shear rate (1 / s) 935.08 2426.52 Maximum shear rate (1 / s) 14162.72 62273.83 Discharge flow (L / min) 5191.33 6327.38 Material circulation rate (mm / s) 466.26 568.29

[0060] As can be seen from Tables 1 and 2, when the existing grinding paddle and the grinding paddle 2A rotate at the same speed, the sand mill 3A using the grinding paddle 2A can drive the grinding paddle 2A to rotate at a lower stirring power, and achieve more excellent operating effects in terms of average shear stress, maximum shear stress, average shear rate, maximum shear rate, ejection flow, and material circulation rate. The sand mill 3A using the existing grinding paddle needs a higher stirring power to drive the grinding paddle 2A to rotate, and the operating effects in terms of average shear stress, maximum shear stress, average shear rate, maximum shear rate, ejection flow, and material circulation rate cannot reach the operating effects of the sand mill 3A using the grinding paddle 2A.

[0061] In summary, the grinding paddle 1A, the grinding paddle 2A, and the sand mill 3A provided by the embodiments of the present application have the following advantages. The thickness of the grinding paddle 1A is designed in association with the circumferential diameter of the paddle, so that the shear surface 2a has sufficient shear surface 2a accumulation, the structure of the paddle is stable and durable, and the paddle can provide greater shear force during rotation. The grinding paddle 1A and the grinding paddle 2A are designed in an axial non-penetrating manner, so that the material cannot penetrate the paddle by using the structure of the paddle itself, and the material is forced to flow in the circumferential direction of the paddle, thereby increasing the time of shear collision of the material during grinding. The grinding paddle 2A divides the angle of the rotation circle 3a by each group of grinding paddles 1A, so that the transmission shaft 3 rotates one circle, each grinding paddle 1A can achieve multiple shear effects, the shear efficiency of the grinding paddle 2A on the material is improved, and the sand mill 3A provided with the grinding paddle 2A has the characteristics of high shear rate and high ejection amount.

[0062] The above description is only the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A grinding paddle, characterized by, The paddle body is provided with a transmission hole concentrically arranged with the center of rotation, and a plurality of shear parts not penetrating the axial direction of the paddle body are formed on the circumferential side of the transmission hole, the plurality of shear parts are collectively inscribed in the same rotation circumference, and the thickness of the shear surface formed by the mutual connection of two adjacent shear parts in the circumferential direction of the paddle body is S; the shear surface is a continuous plane, and the ratio between the thickness S of the shear surface and the diameter D of the rotation circumference is 1:3-1:

4.

2. The grinding paddle of claim 1, wherein, The cross-sectional outer contour of the paddle body is an equilateral triangle.

3. A grinding paddle characterized by, The transmission shaft is arranged in the transmission hole, and a plurality of the grinding paddles are arranged in the axial direction of the transmission shaft, and two adjacent grinding paddles are mutually attached, so that the grinding paddle does not penetrate the axial direction of the transmission shaft.

4. The milling paddle of claim 3, wherein, Two adjacent grinding paddles are arranged in a staggered manner, so that the shear part of any grinding paddle protrudes from the shear surface of the adjacent grinding paddle.

5. The grinding paddle of claim 3, wherein, A plurality of connecting holes are arranged on each paddle body in the circumferential direction of the transmission hole; the connecting holes on two adjacent grinding paddles are correspondingly connected, and a connecting member is arranged in the plurality of connected connecting holes, so that the plurality of grinding paddles are connected in series in the axial direction of the transmission shaft.

6. The milling paddle of claim 3, wherein, The number of grinding paddles is an even number.

7. The grinding paddle of claim 6, wherein, Every two grinding paddles form a group, and a plurality of groups of grinding paddles are arranged in sequence, and the shear parts of the grinding paddles in the same group are uniformly arranged in the rotation circumference.

8. A sand mill characterized by The grinding chamber and the grinding paddle of any one of claims 3-7 are arranged in the grinding chamber in the transverse direction, and a first gap is formed between the front end of the grinding paddle and the grinding chamber in the axial direction of the grinding paddle, and a second gap is formed between the rear end of the grinding paddle and the grinding chamber.

9. The sander of claim 8, wherein, The length of the first gap is equal to the length of the second gap.

10. The sander of claim 8, wherein, A third gap is formed between the circumferential edge of the grinding paddle and the grinding chamber, and the ratio between the length D of the third gap and the total length L of the paddle is 1:5.

Images