Grinding device with separation function

Abstract

The utility model relates to a grinding device with a separation function, the grinding device comprises a grinding unit, a separation unit and a suction unit, the grinding unit comprises a grinding cavity and a grinding component installed in the grinding cavity, the grinding component is connected to a first motor, the first motor can drive the grinding component to rotate, and the separation unit is connected with the suction unit. A grinding medium is stored in the grinding cavity, the grinding cavity is provided with a feed port and a discharge port, the separation unit comprises a separator and an overflow pipe rotatably mounted on the separator, the separator is provided with an underflow port, the underflow port is communicated with the grinding cavity, and the overflow pipe is communicated with the grinding cavity. The first end of the suction unit communicates with the grinding cavity, and the second end of the suction unit communicates with the separator. The grinding device can automatically complete grinding and separating operations, is convenient to operate, and improves the production efficiency and the product quality.

Description

TECHNICAL FIELD

[0001] The application relates to a wet grinding technology, in particular to a grinding device with a separation function. BACKGROUND

[0002] Wet grinding is a method of breaking solid particles in a liquid medium. The wet grinding material is mixed with the liquid medium, and the material is broken by mechanical force and liquid impact force to make the particles smaller, so as to realize the fine processing of the particles in the material, such as the grinding and dispersion of minerals, pigments, dyes, chemicals, magnetic materials, ceramics and the like into fine particles to obtain products or intermediate products such as coatings, pigments and the like.

[0003] In order to achieve the ideal particle size and sharp particle size distribution in a short time, the general dispersion grinding equipment usually adopts dense arrangement of, for example, pin type grinding members to drive the grinding medium to work at high speed. Although the pins in the grinding machine can obtain good grinding and shearing effect at high speed, the dense arrangement of the pins makes the gap in the grinding chamber small, and the grinding medium is extruded and in a low-speed flow state, which makes the material and the grinding medium unable to fully circulate in the grinding chamber, and the contact between the material and the grinding medium is repeatedly limited in the same area. Insufficient energy in the grinding chamber will lead to local overheating in the grinding chamber, excessive wear of the inner wall of the grinding chamber, and uneven grinding of the material.

[0004] In order to separate the grinding medium and the grinding material after completing the grinding work, a screen and a screen box are usually used. However, the surface screening area of the screen and the screen box is limited and is prone to clogging. Once clogging occurs, the pressure in the grinding chamber will increase, and the screening efficiency and production safety are insufficient. Moreover, as the grinding time increases, the particles in the material will be gradually sheared and broken by impact into submicron or even nanometer level. At this time, a large amount of adsorption will occur on the surface of the particles due to the increase of the specific surface area, forming secondary agglomerates. The generation of secondary agglomerates will significantly affect the particle size and particle size distribution of the product, and it is necessary to remove the secondary agglomerates as much as possible before forming the final product to prevent negative effects on the performance of the product. Therefore, after the grinding work, not only the separation of the grinding medium and the grinding material needs to be completed, but also the separation operation of the secondary agglomerates of the grinding material needs to be performed, which is time-consuming and labor-intensive. CONTENT OF THE INVENTION

[0005] In order to overcome the above-mentioned defects, the application provides a grinding device with a separation function, which can automatically complete the grinding and separation operations, is convenient to operate, and improves the production efficiency and the quality of the product.

[0006] The technical scheme adopted by the application to solve the technical problem is:

[0007] The application discloses a grinding device with a separation function, which comprises a grinding unit, a separation unit and a suction unit. The grinding unit comprises a grinding cavity and a grinding component installed in the grinding cavity. The grinding component is connected to a first motor, and the first motor can drive the grinding component to rotate. The grinding cavity stores grinding medium. The grinding cavity is provided with an inlet and an outlet. The separation unit comprises a separator and an overflow pipe rotatably installed on the separator. The separator is provided with an underflow port, and the underflow port is communicated with the grinding cavity. The first end of the suction unit is communicated with the grinding cavity, and the second end of the suction unit is communicated with the separator. The suction unit is used for conveying mixed material in the grinding cavity to the separator. The mixed material is separated into light material and heavy material in the separator. The light material is discharged through the overflow pipe, and the heavy material returns to the grinding cavity through the underflow port.

[0008] Optionally, the suction unit comprises a suction pipe and a suction pump installed on the suction pipe. The first end of the suction pipe is communicated with the grinding cavity, and the second end of the suction pipe is communicated with the inlet of the separator.

[0009] Optionally, at least one classification sieve plate is installed in the separator. The classification sieve plate is provided with uniformly distributed sieve holes. The diameter of the first end of the sieve hole is greater than the diameter of the second end of the sieve hole. The first end of the sieve hole is close to the grinding cavity, and the second end of the sieve hole is away from the grinding cavity.

[0010] Optionally, the longitudinal section of the sieve hole comprises a trapezoidal structure, or the structure of the sieve hole comprises a circular truncated cone structure.

[0011] Optionally, the diameter of the grinding medium is between 0.05 mm and 0.4 mm, and the aperture of the sieve hole is greater than the diameter of the grinding medium.

[0012] Optionally, the shape of the grinding cavity comprises a columnar shape, and the shape of the longitudinal section of the grinding cavity comprises a closed structure formed by sequentially connecting N arc shapes. The longitudinal section is perpendicular to the central axis of the grinding cavity, and N is greater than or equal to 2.

[0013] Optionally, the overflow pipe is inserted into the interior of the separator. The length of the overflow pipe located in the separator is defined as H1, and the height of the separator is defined as H2. The H2 is less than 3*H1.

[0014] Optionally, the separator comprises a first part and a second part fixedly connected. The shape of the first part comprises a cylindrical structure, and the shape of the second part comprises a circular truncated cone structure. The second part is provided with the underflow port, and the first part is communicated with the suction unit.

[0015] Optionally, the shape of the grinding member comprises at least one of a disc type, an impeller type and a U-shaped stirring paddle.

[0016] Optionally, a jacket is arranged on the grinding cavity, the jacket is used for passing a temperature control medium, a filling rate of the grinding medium in the grinding cavity is between 50% and 90%, and the overflow pipe is connected to a second motor, and the second motor can drive the overflow pipe to rotate.

[0017] The application has the following beneficial effects:

[0018] (1) The centrifugal force generated by the rotation of the overflow pipe in the separator is used to separate the material into light material and heavy material, the light material is discharged from the overflow pipe, and the heavy material is discharged from the underflow port, thereby realizing the separation of the required liquid material from the grinding medium and large particles, improving the product quality, and saving the production cost. Therefore, the grinding device can automatically complete the grinding and separation operations, is convenient to operate, and improves the production efficiency and the product quality.

[0019] (2) The separator is provided with a grading sieve plate, the grading sieve plate is provided with sieve holes, the light quality secondary agglomerates are effectively intercepted, the trapezoidal configuration with a narrow upper part and a wide lower part can effectively prevent the sieve holes from being blocked, after the separator stops running, the secondary agglomerates will naturally fall along the inner surface of the sieve holes on the grading sieve plate into the grinding cavity, and gradually increase in volume and mass until they cannot be sucked into the separator during grinding, thereby effectively preventing the secondary agglomerates from affecting the quality of the final product.

[0020] (3) The grinding cavity in the application adopts an elliptical superposition configuration, which reduces the dead zone in the grinding cavity, and the vortex generated by the liquid material under the driving of the rotation of the grinding member helps the liquid material and the grinding medium to collide fully, thereby improving the grinding efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a grinding device in Embodiment 1 of the application;

[0022] Figure 2 FIG. 2 is a partial structural schematic diagram of the grinding device in Embodiment 1 of the application;

[0023] Figure 3 FIG. 3 is a longitudinal sectional view of the grinding cavity in Embodiment 1 of the application;

[0024] Figure 4 FIG. 4 is a structural schematic diagram of a separator in Embodiment 1 of the application;

[0025] Figure 5 FIG. 5 is a structural schematic diagram of a grading sieve plate in Embodiment 1 of the application;

[0026] Figure 6 Figure 1 is a structural schematic diagram of a grinding device in Embodiment 2 of the present application;

[0027] In the figure: 100-grinding unit, 110-grinding cavity, 111-jacket, 120-grinding member, 130-first motor, 200-separation unit, 210-separator, 211-first part, 212-second part, 213-inlet, 214-underflow outlet, 220-overflow pipe, 230-classifying sieve plate, 231-sieve hole, 240-second motor, 300-suction unit, 310-suction pipe, 320-suction pump. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the embodiments described in the present application are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the following drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the objects thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Example 1: As Figures 1-5 As shown in the figure, the arrows indicate the direction of material flow or the direction of inlet and outlet. A grinding device with separation function includes a grinding unit 100, a separation unit 200, and a suction unit 300. The grinding unit 100 includes a grinding chamber 110 and a grinding component 120 installed in the grinding chamber 110. The grinding component 120 is connected to a first motor 130, which can drive the grinding component 120 to rotate. The grinding chamber 110 stores grinding media and has an inlet and an outlet. The inlet is used for raw materials and grinding media to enter the grinding chamber 110. The raw materials include pigment powder, solvent, dispersant and other additives. The outlet is used for waste materials and grinding media to be discharged. The separation unit 200 includes a separator 210 and an overflow pipe 220 rotatably installed on the separator 210. The separator 210 is provided with an underflow port 214, which is connected to the grinding chamber 110. Optionally, the underflow port 214 is located inside the grinding chamber 110 and is located directly above the grinding component 120.

[0032] The first end of the suction unit 300 is connected to the grinding chamber 110, and the second end of the suction unit 300 is connected to the separator 210. That is, the suction unit 300 connects the grinding chamber 110 and the separator 210. The suction unit 300 is used to transport the mixture in the grinding chamber 110 to the separator 210. The mixture is separated into light materials and heavy materials in the separator 210. That is, when the overflow pipe 220 rotates in the separator 210, it drives the mixture to rotate and generates centrifugal force, thereby separating the mixture into light materials and heavy materials. The light materials include a suspension containing small particles, and the heavy materials include grinding media and large particles. The light materials are discharged through the overflow pipe 220, and the heavy materials are returned to the grinding chamber 110 through the underflow port 214.

[0033] like Figure 1 As shown, the grinding chamber 110 is located below the separator 210, with the lower end of the separator 210 inside the grinding chamber 110. During operation, the raw material is fed into the grinding chamber 110 through the feed inlet. The first motor 130 drives the grinding component 120 to rotate. The grinding component 120 causes the material to flow, stir, and collide with the grinding media. The speed of the first motor 130 is generally above 1000 r / min. Too low a speed will result in an excessively long grinding time, which may cause the dispersant to fall off the surface of the pigment particles. The material generates a vortex circulation flow in the grinding chamber. The grinding time is generally 2 to 6 hours. The grinding chamber can process 10 to 30 L of liquid material at a time. The grinding component 120 drives the grinding media to collide and shear with the liquid material, achieving the effect of grinding the material.

[0034] After grinding is completed, the first motor 130 is turned off, and the suction unit 300 transports the mixture in the grinding chamber 110 to the separator 210. The overflow pipe 220 rotates, causing the material to rotate and generate centrifugal force, thereby separating the material into light and heavy materials. The light material, a suspension containing small particles, will be discharged from the overflow pipe 220, while the heavy material, including grinding media and large particles, will be discharged from the underflow port 214. After the separation operation is completed, waste and grinding media will be discharged from the outlet on the grinding chamber 110. The cleaning process will be achieved by circulating the cleaning solvent in the grinding chamber 110 and the separator 210.

[0035] This application utilizes the centrifugal force generated by the rotation of the overflow pipe 220 in the separator 210 to separate materials into light and heavy materials. The light materials are discharged from the overflow pipe 220, while the heavy materials are discharged from the underflow port 214. This achieves the separation of the required liquid materials from the grinding media and large particles, improving product quality. The heavy materials fall back into the grinding chamber 110 for further grinding, saving production costs. Therefore, this grinding device can automatically complete the grinding and separation operations, is easy to operate, and improves production efficiency and product quality.

[0036] As Figure 1 shown, the suction unit 300 comprises a suction pipe 310 and a suction pump 320 installed on the suction pipe 310, the first end of the suction pipe 310 is communicated with the grinding cavity 110, and the second end of the suction pipe 310 is communicated with the inlet 213 of the separator 210. Optionally, the suction pipe 310 is arranged vertically with the separator 210. After grinding, the suction pipe 310 draws the material from the grinding cavity 110 into the separator 210 for separation by the suction pump 320.

[0037] As Figure 4 shown, at least one classification sieve plate 230 is installed in the separator 210, and the classification sieve plate 230 is detachably installed in the separator 210. Optionally, the classification sieve plate 230 is located in the overflow pipe 220. In this embodiment, two parallel classification sieve plates 230 are arranged in the overflow pipe 220, and the classification sieve plate 230 is arranged horizontally in the overflow pipe 220. As Figure 5 shown, the classification sieve plate 230 is provided with uniformly distributed sieve holes 231, the first end of the sieve hole 231 is larger in diameter than the second end of the sieve hole 231, the first end of the sieve hole 231 is close to the grinding cavity 110, and the second end of the sieve hole 231 is away from the grinding cavity 110. That is, the sieve hole 231 has a structure of being narrow at the top and wide at the bottom.

[0038] As Figure 5 shown, the longitudinal section of the sieve hole 231 comprises a trapezoidal structure; the upper base of the trapezoidal structure is smaller than the lower base, and the lower base is close to the grinding cavity 110, and the upper base is away from the grinding cavity 110. Alternatively, the structure of the sieve hole 231 comprises a circular truncated cone structure. The area of the upper base of the circular truncated cone structure is smaller than the area of the lower base, and the lower base is close to the grinding cavity 110, and the upper base is away from the grinding cavity 110.

[0039] Although the separator 210 separates large particles and a small amount of grinding medium from the liquid material, at this time the particles in the liquid material are already small enough, and the mass of the secondary agglomerates is not enough to support them to fall back into the grinding cavity. If the secondary agglomerates are discharged from the overflow pipe along with the light material at this time, the performance of the product will still be affected to a certain extent, and the classification sieve plate 230 can effectively intercept the secondary agglomerates through the sieve hole 231.

[0040] The separator 210 is provided with a grading sieve plate 230, and the grading sieve plate 230 is provided with sieve holes 231 for effectively intercepting secondary agglomerates with light mass. The trapezoidal configuration with narrow upper part and wide lower part can effectively prevent the sieve holes 231 from being blocked. After the separator 210 stops running, the secondary agglomerates will naturally fall along the inner surface of the sieve holes 231 on the grading sieve plate 230 into the grinding cavity 110, and the volume and mass gradually increase with the grinding until the secondary agglomerates cannot be sucked into the separator 210, thereby effectively preventing the secondary agglomerates from affecting the quality of the final product.

[0041] Optionally, the diameter of the grinding medium is between 0.05 mm and 0.4 mm, and the pore size of the sieve holes 231 is greater than the diameter of the grinding medium. That is, the pore size of the narrowest part of the sieve holes 231 is greater than the diameter of the grinding medium.

[0042] As shown in Figure 2 and Figure 3 , the shape of the grinding cavity 110 includes a columnar shape, and the shape of the longitudinal section of the grinding cavity 110 includes a closed structure formed by sequentially connecting N arc shapes, and the longitudinal section is perpendicular to the central axis of the grinding cavity 110, wherein N≥2. The N arc shapes are the same in shape and equal in size, and N is an even number. Optionally, N≥4. The grinding cavity 110 has a columnar structure, and the four peripheral side walls of the grinding cavity 110 are composed of a plurality of arc surfaces. In this embodiment, the four peripheral side walls of the grinding cavity 110 are composed of four arc surfaces, as shown in Figure 3 , that is, the longitudinal section of the grinding cavity 110 is formed by tangentially connecting two concentric ellipses with the same shape and size, and the major axes of the two ellipses are arranged perpendicular to each other. The dashed line in the figure outlines a virtual ellipse. Of course, the longitudinal section of the grinding cavity 110 can also be formed by intersecting three or more concentric ellipses with the same shape and size, and the included angles formed by the major axes of two adjacent ellipses are equal.

[0043] The grinding cavity 110 adopts an elliptical superposition configuration, which reduces the dead zone in the grinding cavity 110. The vortex generated in the liquid material under the rotation drive of the grinding member 120 helps the liquid material and the grinding medium to collide sufficiently, thereby improving the grinding efficiency. The direction of the liquid material flow is shown by the arrows in Figure 2 .

[0044] As shown in Figure 1 , the columnar grinding cavity 110 is horizontally placed on a support table, that is, the central axis of the grinding cavity 110 is parallel to the horizontal plane, and the separator 210 and the material extraction pipe 310 are installed on the arc-shaped side wall of the grinding cavity 110.

[0045] As shown in Figure 4As shown, the overflow pipe 220 is inserted into the interior of the separator 210. The length of the overflow pipe 220 within the separator 210 is defined as H1, and the height of the separator 210 is defined as H2, where H2 < 3 * H1. That is, the length of the overflow pipe 220 extending inside the separator 210 is not less than one-third of the total height of the separator 210.

[0046] like Figure 4 As shown, the separator 210 includes a first part 211 and a second part 212 fixedly connected. The first part 211 has a cylindrical shape, and the second part 212 has a frustum shape. The second part 212 is provided with the underflow port 214. The first part 211 is connected to the suction unit 300. That is, the separator 210 has a cylindrical-frustum structure, with the cylinder located on top of the frustum, and the underflow port 214 located at the lower end of the frustum. The suction pipe 310 is connected to the first part 211 of the separator 210.

[0047] like Figure 2 As shown, the shape of the grinding component 120 includes at least one of disc type, impeller type and U-shaped stirring paddle. Figure 2 The grinding component 120 shown is disc-shaped. That is, the grinding component 120 does not have densely arranged components. Within the grinding chamber 110, the grinding media and liquid materials mainly rely on collision and crushing. Therefore, the grinding component 120 only serves to drive the flow and mixing of liquid materials and grinding media. It does not need to use densely arranged components to occupy a large amount of space within the chamber, thus preventing problems such as insufficient energy dispersion, local overheating, and uneven grinding caused by excessively small gaps within the chamber.

[0048] like Figure 2 As shown, the grinding chamber 110 is provided with a jacket 111, which is used to introduce a temperature control medium to control the temperature inside the grinding chamber 110. The filling rate of the grinding medium inside the grinding chamber 110 is between 50% and 90%.

[0049] Example 2, as Figure 6 As shown, the overflow pipe 220 is connected to the second motor 240, which can drive the overflow pipe 220 to rotate. The difference between this embodiment and Embodiment 1 is that in this embodiment, the second motor 240 is used to drive the overflow pipe 220 to rotate. During the separation process after the grinding operation, the overflow pipe 220 is driven to rotate by the second motor 12, causing the liquid material to rotate within the separator 210. Furthermore, the overflow pipe 220 creates a suction effect within the separator 210, which helps to quickly discharge light materials.

[0050] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A grinding device having a separating function, characterized by: The application relates to a grinding, separating and pumping device, which comprises a grinding unit (100), a separating unit (200) and a pumping unit (300), wherein the grinding unit (100) comprises a grinding cavity (110) and a grinding component (120) installed in the grinding cavity (110), the grinding component (120) is connected to a first motor (130), the first motor (130) can drive the grinding component (120) to rotate, the grinding cavity (110) stores grinding medium, the grinding cavity (110) is provided with an inlet and an outlet, the separating unit (200) comprises a separator (210) and an overflow pipe (220) rotatably installed on the separator (210), the separator (210) is provided with an underflow port (214) which is communicated with the grinding cavity (110), the first end of the pumping unit (300) is communicated with the grinding cavity (110), the second end of the pumping unit (300) is communicated with the separator (210), the pumping unit (300) is used for conveying mixed material in the grinding cavity (110) to the separator (210), the mixed material is separated into light material and heavy material in the separator (210), the light material is discharged through the overflow pipe (220), and the heavy material returns to the grinding cavity (110) through the underflow port (214).

2. The grinding device having a separation function according to claim 1, characterized in that: The pumping unit (300) comprises a pumping pipe (310) and a pumping pump (320) installed on the pumping pipe (310), the first end of the pumping pipe (310) is communicated with the grinding cavity (110), and the second end of the pumping pipe (310) is communicated with an inlet (213) of the separator (210).

3. The grinding device having a separation function according to claim 1, characterized in that: At least one classification sieve plate (230) is installed in the separator (210), the classification sieve plate (230) is provided with uniformly distributed sieve holes (231), the diameter of the first end of the sieve hole (231) is larger than the diameter of the second end of the sieve hole (231), the first end of the sieve hole (231) is close to the grinding cavity (110), and the second end of the sieve hole (231) is away from the grinding cavity (110).

4. The grinding device with a separation function according to claim 3, characterized in that: The longitudinal section of the sieve hole (231) comprises a trapezoidal structure, or the structure of the sieve hole (231) comprises a circular truncated cone structure.

5. The grinding device having a separation function according to claim 3, characterized in that: The diameter of the grinding medium is between 0.05 mm and 0.4 mm, and the aperture of the sieve hole (231) is larger than the diameter of the grinding medium.

6. The grinding device having a separation function according to claim 1, characterized in that: The shape of the grinding cavity (110) comprises a columnar shape, the shape of the longitudinal section of the grinding cavity (110) comprises a closed structure formed by sequentially connecting N arc shapes, the longitudinal section is perpendicular to the central axis of the grinding cavity (110), and N is greater than or equal to 2.

7. The grinding device with a separating function according to claim 6, characterized in that: The overflow pipe (220) is inserted into the interior of the separator (210), the length of the overflow pipe (220) located in the separator (210) is defined as H1, the height of the separator (210) is defined as H2, and H2 is less than 3*H1.

8. The grinding device having a separation function according to claim 1, characterized in that: The separator (210) comprises a fixedly connected first part (211) and a second part (212), the shape of the first part (211) comprises a cylindrical structure, the shape of the second part (212) comprises a circular truncated cone structure, the second part (212) is provided with the underflow port (214), and the first part (211) is communicated with the suction unit (300).

9. The grinding device having a separation function according to claim 1, characterized in that: The shape of the grinding member (120) comprises at least one of a disc type, an impeller type and a U-shaped stirring paddle.

10. The grinding device having a separation function according to claim 1, characterized in that: The grinding cavity (110) is provided with a jacket (111) for passing in temperature control medium, the filling rate of the grinding medium in the grinding cavity (110) is between 50% and 90%, the overflow pipe (220) is connected to a second motor (240), The second motor (240) can drive the overflow pipe (220) to rotate. ​

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