Horizontal stirring mill

Abstract

The utility model relates to a horizontal stirring mill which comprises a driving mechanism, a grinding cylinder and a stirring shaft, the stirring shaft is rotatably installed in the grinding cylinder, the driving mechanism is connected to the stirring shaft and can drive the stirring shaft to rotate, a stirring component is fixedly arranged on the stirring shaft, and the stirring component is connected to the grinding cylinder and can drive the stirring shaft to rotate. A disturbance block is fixedly arranged on the portion, between every two adjacent stirring components, of the stirring shaft, a plurality of spiral protrusions arranged in the circumferential direction are arranged on the inner wall of the grinding cylinder, and the direction of pushing materials through the spiral protrusions is opposite to the flowing direction of the materials in the grinding cylinder. According to the stirring mill, the inner wall of the grinding cylinder is provided with a plurality of spiral bulges which are arranged along the circumferential direction, so that the turbulence degree of materials is improved, and the grinding efficiency of the stirring mill is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to slurry grinding technology, in particular to a horizontal stirring mill. BACKGROUND

[0002] The stirring mill is a kind of mill with grinding medium, usually called stirring grinder. Its stirring shaft drives the grinding medium to stir, so that the grinding medium is in the state of internal porous type irregularity, in which state, the collision and shear between the grinding medium and the particles, and the irregular motion, so as to break the particles. The stirring mill is widely used in nanometer materials, electronic ceramics, battery materials, high-grade coatings, automobile paint, ink, pigment, dye, rubber, etc.

[0003] The stirring mill can be divided into horizontal sand mill, basket sand mill, vertical sand mill, etc., among which the horizontal stirring mill is most widely used. The typical horizontal sand mill includes a base, a motor fixed on the base, a main shaft driven by the motor and a grinding cylinder, the grinding cylinder forms a grinding cavity, the grinding cavity is provided with an inlet and an outlet, the outlet is provided with a screen to separate the grinding medium and the material; a plurality of grinding rods are fixedly arranged in the grinding cavity, and the grinding cavity is also filled with grinding medium. The structure of this horizontal stirring mill cannot make the grinding medium fully move in the grinding cavity when the applied grinding momentum is small, so that the material is extruded and sheared, thus the grinding efficiency is low. In addition, the small particles of the grinding medium can also cause the screen to be blocked, and the grinding medium can even be sprayed out of the screen when the pressure of the screen is too large. CONTENT

[0004] In order to overcome the above defects, the present application provides a horizontal stirring mill, the inner wall of the grinding cylinder is provided with a plurality of spiral protrusions arranged in the circumferential direction, so as to improve the turbulent degree of the material, and thus improve the grinding efficiency of the stirring mill.

[0005] The technical scheme adopted by the present application to solve the technical problems is:

[0006] A horizontal stirring mill, comprising a driving mechanism, a grinding cylinder and a stirring shaft, the stirring shaft is rotatably installed in the grinding cylinder, the driving mechanism is connected to the stirring shaft, and the driving mechanism can drive the stirring shaft to rotate, the stirring shaft is fixedly provided with stirring members, the stirring shaft between two adjacent stirring members is fixedly provided with a disturbing block, the inner wall of the grinding cylinder is provided with a plurality of spiral protrusions arranged in the circumferential direction, the direction of the material pushed by the spiral protrusion is opposite to the flow direction of the material in the grinding cylinder.

[0007] Optionally, the thickness of each spiral protrusion is different at different positions in the spiral direction, and the minimum thickness of each spiral protrusion is located at the midpoint or endpoint of the spiral protrusion.

[0008] Optionally, the spiral protrusions comprise a first spiral protrusion and a second spiral protrusion arranged at intervals, and the midpoint of the first spiral protrusion and the end point of the second spiral protrusion are located on the same diameter of the grinding cylinder.

[0009] Optionally, the thickness variation trend of the first spiral protrusion and the thickness variation trend of the second spiral protrusion are the same or opposite.

[0010] Optionally, the horizontal stirring mill further comprises a rack, the driving mechanism is mounted on the rack, the driving mechanism comprises a rotary motor, the grinding cylinder is mounted on the rack along the horizontal direction, and the stirring shaft is arranged along the axial direction of the grinding cylinder.

[0011] Optionally, the structure of the stirring member comprises a disc structure or a rod structure.

[0012] Optionally, the grinding cylinder is provided with a feeding pipe and a discharging pipe, and the inner side of the discharging pipe is fixedly provided with a screen.

[0013] Optionally, the inner wall of the grinding cylinder is provided with a Venturi-shaped mixing cylinder section, the mixing cylinder section comprises a throat section and a diffusion section, the diffusion section is located between the throat section and the screen, and the throat section is located between two adjacent stirring members.

[0014] Optionally, a return pipe is mounted on the grinding cylinder, a first end of the return pipe is communicated in the grinding cylinder, and a second end of the return pipe is communicated with the throat section.

[0015] Optionally, the first end of the return pipe is connected in the grinding cylinder between the throat section and the screen, a shut-off valve is mounted on the return pipe, a pressure gauge is mounted on the grinding cylinder, and the pressure gauge is mounted at the screen.

[0016] The beneficial effects of the present application are:

[0017] (1) In the present application, the inner wall of the grinding cylinder is provided with a plurality of spiral protrusions arranged in the circumferential direction, the direction in which the spiral protrusions push the material is opposite to the flow direction of the material in the grinding cylinder, the degree of turbulence of the material is improved, a plurality of vortexes are formed in the grinding cylinder, the grinding medium moves fully in the grinding cylinder, thereby extruding and shearing the material, and the grinding efficiency of the stirring mill is improved; the thickness variation trend and arrangement position of each spiral protrusion are specially designed, the degree of turbulence of the material is further improved, and the grinding efficiency is improved.

[0018] (2) According to the principle of fluid dynamics, a Venturi-shaped mixing cylinder section and a backflow pipe are arranged in the grinding cylinder, so that a small amount of grinding medium and material accumulated at the screen can return to the cylinder, and the turbulence degree of the flow in the grinding cylinder is improved, the grinding efficiency is improved, and the probability of screen blockage is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the stirring mill in Embodiment 1 of the application.

[0020] Figure 2 It is an arrangement diagram of the spiral protrusions of the grinding cylinder after being unfolded in Embodiment 1 of the application.

[0021] Figure 3 It is a side view of the spiral protrusions in the grinding cylinder in Embodiment 1 of the application.

[0022] Figure 4 It is a structural schematic diagram of the stirring mill in Embodiment 2 of the application.

[0023] In the figure: 10 - frame, 20 - driving mechanism, 30 - grinding cylinder, 31 - first spiral protrusion, 32 - second spiral protrusion, 33 - throat section, 34 - diffusion section, 35 - backflow pipe, 36 - feeding pipe, 37 - discharging pipe, 38 - screen, 40 - stirring shaft, 41 - stirring member, 42 - disturbance block, 50 - shut-off valve, 51 - pressure gauge. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the embodiments described in the application are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0025] It should be noted that the terms "first", "second", and the like in the specification and claims of the 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 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 including 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 not clearly listed or inherent to these processes, methods, products or devices.

[0026] 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.

[0027] Example 1: As Figures 1-3 As shown, a horizontal stirred mill includes a drive mechanism 20, a grinding cylinder 30, and a stirring shaft 40. The stirring shaft 40 is rotatably mounted inside the grinding cylinder 30. The drive mechanism 20 is connected to the stirring shaft 40 and can drive the stirring shaft 40 to rotate. A stirring component 41 is fixedly mounted on the stirring shaft 40. A disturbance block 42 is fixedly mounted on the stirring shaft 40 between two adjacent stirring components 41 to increase material disturbance near the root region of the stirring component 41. The inner wall of the grinding cylinder 30 has multiple circumferentially arranged spiral protrusions. The direction in which the spiral protrusions push the material is opposite to the flow direction of the material within the grinding cylinder 30. The direction in which the spiral protrusions push the material is determined by both the spiral direction of the spiral protrusions and the rotation direction of the stirring shaft 40. Figure 2 As shown, opposite to the overall flow direction D of the material, when the material flows in the grinding cylinder 30, the material impacts the rotating protrusions. The rotating protrusions exert opposite forces on the material to increase the turbulence of the material, causing the grinding material to form multiple vortices in the grinding cylinder. The grinding media moves fully in the grinding cylinder, thereby squeezing and shearing the material, thus improving the grinding efficiency of the stirred mill.

[0028] The thickness of each spiral protrusion varies at different positions along the spiral direction, with the minimum thickness of each spiral protrusion located at its midpoint or end point. That is, the thickness of each spiral protrusion changes along the spiral direction. The distance between the midpoint and the two end points of the spiral protrusion is equal. In the first embodiment, the thickness of the spiral protrusion is minimum at the midpoint, and the thickness gradually increases towards the two end points; that is, the spiral protrusion is thinner in the middle and thicker at both ends.

[0029] In the second embodiment, the thickness of the helical protrusion is the largest at the midpoint, and gradually decreases towards the two end points, i.e. the helical protrusion is thick in the middle and thin at the two ends.

[0030] In the third embodiment, the thickness of the helical protrusion is the largest at one end point, and gradually decreases towards the other end point.

[0031] As shown in Figure 2 , the helical protrusion comprises a first helical protrusion 31 and a second helical protrusion 32 arranged at a distance from each other, i.e. the first helical protrusion 31 is arranged adjacent to the second helical protrusion 32, and the midpoint of the first helical protrusion 31 and the end point of the second helical protrusion 32 are located on the same diameter of the grinding cylinder 30. That is, the midpoint of the first helical protrusion 31 and at least one end point of the second helical protrusion 32 are on the same diameter of the grinding cylinder 30.

[0032] As shown in Figure 3 , in a possible embodiment, the thickness of the first helical protrusion 31 is the smallest at the midpoint of the helix, and the thickness is the largest at the two end points of the helix, i.e. h2>h1. The thickness of the second helical protrusion 32 is the largest at the midpoint of the helix, and the thickness is the smallest at the two end points of the helix. One end point of the second helical protrusion 32 and the midpoint of the first helical protrusion 31 are located at the two ends of the same diameter of the grinding cylinder 30. In other embodiments, h1 can be 0.

[0033] The thickness variation trend of the first helical protrusion 31 and the thickness variation trend of the second helical protrusion 32 are the same or opposite. When the thickness variation trends of the first helical protrusion 31 and the second helical protrusion 32 are the same, the first helical protrusion 31 and the second helical protrusion 32 are both thick in the middle and thin at the two ends; or, the first helical protrusion 31 and the second helical protrusion 32 are both thin in the middle and thick at the two ends. When the thickness variation trends of the first helical protrusion 31 and the second helical protrusion 32 are opposite, the first helical protrusion 31 is thick in the middle and thin at the two ends, and the second helical protrusion 32 is thin in the middle and thick at the two ends; or, the first helical protrusion 31 is thin in the middle and thick at the two ends, and the second helical protrusion 32 is thick in the middle and thin at the two ends. In this application, the thickness variation trend and arrangement position of each helical protrusion are specially designed to further improve the degree of turbulence of the material.

[0034] As shown in Figure 1 , the horizontal stirring mill further comprises a frame 10, the driving mechanism 20 is installed on the frame 10, the driving mechanism 20 comprises a rotary motor, the grinding cylinder 30 is installed on the frame 10 along the horizontal direction, and the stirring shaft 40 is arranged along the axial direction of the grinding cylinder 30. That is, the central axis of the grinding cylinder 30 is parallel to the horizontal plane.

[0035] Optionally, the structure of the stirring member 41 comprises a disc structure or a rod structure.

[0036] As shown in the figure, the grinding cylinder 30 is provided with a feeding pipe 36 and a discharging pipe 37, and the inner side of the discharging pipe 37 is fixedly provided with a screen 38. The screen 38 can block the materials with large diameters. Figure 1

[0037] As shown in the figure, the embodiment is different from the embodiment 1 in that the inner wall of the grinding cylinder 30 is provided with a Venturi-shaped mixing cylinder section, which comprises a throat section 33 and a diffusion section 34. The diffusion section 34 is located between the throat section 33 and the screen 38, and the throat section 33 is located between two adjacent stirring members 41. That is, compared with the throat section 33, the diffusion section 34 is closer to the screen 38, and the diameter of the throat section 33 is smaller than that of the diffusion section 34. No stirring member 41 is arranged on the corresponding stirring shaft 40 of the throat section 33. Figure 4 The grinding cylinder 30 is provided with a return pipe 35, the first end of the return pipe 35 is communicated with the grinding cylinder 30, and the second end of the return pipe 35 is communicated with the throat section 33. The first end of the return pipe 35 is close to the screen 38,

[0038] The arrow of the return pipe 35 indicates the flow direction of the return material. According to the principle of fluid dynamics, the Venturi-shaped mixing cylinder section and the return pipe 35 arranged in the grinding cylinder 30 can make a small amount of grinding medium and material accumulated at the screen return to the cylinder and improve the turbulent degree of the flow in the grinding cylinder, so as to improve the grinding efficiency and reduce the probability of screen blockage. Figure 4 The first end of the return pipe 35 is connected to the grinding cylinder 30 between the throat section 33 and the screen 38, a shut-off valve 50 is arranged on the return pipe 35, a pressure gauge 51 is arranged on the grinding cylinder 30, and the pressure gauge 51 is arranged at the screen 38. The shut-off valve 50 and the pressure gauge 51 are respectively connected to a controller, so that the controller controls the opening and closing of the shut-off valve according to the pressure, so as to realize the automatic control of the material return flow and improve the intelligence of the equipment. In this application, the pressure gauge 51 is arranged at the screen 38 to monitor the pressure at the screen 38 in real time. Once it is found that the pressure exceeds the normal range, the shut-off valve 50 is opened, the material at the screen 38 is released back to the grinding cylinder 30 through the return pipe 35, so as to reduce the pressure at the screen 38, and the blocked screen 38 is processed in time, so as to prevent the screen from being blocked by the small particle grinding medium and the phenomenon that the grinding medium is sprayed from the screen under the condition that the pressure of the screen is too large, thereby improving the running stability and safety of the stirring mill.

[0039]

[0040] ​​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 patent of the present application should be subject to the appended claims.

Claims

1. A horizontal stirred mill characterized by: The grinding device comprises a driving mechanism (20), a grinding cylinder (30) and a stirring shaft (40) rotatably installed in the grinding cylinder (30), the driving mechanism (20) is connected to the stirring shaft (40) and can drive the stirring shaft (40) to rotate, stirring members (41) are fixedly arranged on the stirring shaft (40), a disturbing block (42) is fixedly arranged on the stirring shaft (40) between two adjacent stirring members (41), and the inner wall of the grinding cylinder (30) is provided with a plurality of helical protrusions arranged in the circumferential direction, the direction in which the helical protrusions push materials is opposite to the flowing direction of the materials in the grinding cylinder (30).

2. A horizontal agitator mill according to claim 1, characterized in that: The thickness of each helical protrusion is different at different positions in the helical direction, and the minimum thickness of each helical protrusion is located at the midpoint or the endpoint of the helical protrusion.

3. The horizontal stirred mill of claim 1, wherein: The helical protrusions comprise first helical protrusions (31) and second helical protrusions (32) arranged at intervals, the midpoint of the first helical protrusion (31) and the endpoint of the second helical protrusion (32) are located on the same diameter of the grinding cylinder (30).

4. A horizontal agitator mill according to claim 3, characterized in that: The thickness variation trend of the first helical protrusion (31) is the same as or opposite to that of the second helical protrusion (32).

5. The horizontal agitator mill according to claim 1, characterized in that: The grinding device further comprises a rack (10), the driving mechanism (20) is installed on the rack (10), the driving mechanism (20) comprises a rotary motor, the grinding cylinder (30) is installed on the rack (10) in the horizontal direction, and the stirring shaft (40) is arranged in the axial direction of the grinding cylinder (30).

6. The horizontal agitator mill according to claim 1, characterized in that: The structure of the stirring member (41) comprises a disc structure or a rod structure.

7. The horizontal agitator mill according to claim 1, characterized in that: The grinding cylinder (30) is provided with a feeding pipe (36) and a discharging pipe (37), and a screen (38) is fixedly arranged on the inner side of the discharging pipe (37).

8. A horizontal agitator mill according to claim 7, characterized in that: The inner wall of the grinding cylinder (30) is provided with a Venturi-shaped mixing cylinder section, the mixing cylinder section comprises a throat section (33) and a diffusion section (34), the diffusion section (34) is located between the throat section (33) and the screen (38), and the throat section (33) is located between two adjacent stirring members (41).

9. A horizontal agitator mill according to claim 8, characterized in that: A return pipe (35) is installed on the grinding cylinder (30), a first end of the return pipe (35) is communicated with the grinding cylinder (30), and a second end of the return pipe (35) is communicated with the throat section (33).

10. A horizontal agitator mill according to claim 9, characterized in that: The first end of the return pipe (35) is connected to the grinding cylinder (30) between the throat section (33) and the screen (38), a shut-off valve (50) is installed on the return pipe (35), a pressure gauge (51) is installed on the grinding cylinder (30), and the pressure gauge (51) is installed at the screen (38).

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