A vertical mill for quartz sand

Abstract

This utility model relates to the field of quartz sand processing technology, specifically to a vertical quartz sand mill, comprising a frame, a grinding disc mounted on the frame, and several grinding rollers rotatably mounted on the frame. All the grinding rollers rotate around a vertical axis. The grinding disc is provided with grinding tracks that cooperate with the grinding rollers. A cooling channel is provided on the vertical axis, extending into the roller shaft. Several air vents are provided on the non-rolling side of the grinding rollers, communicating with the cooling channels within the roller shaft. A non-metallic wear-resistant layer is provided on the inner wall of the grinding track, and the side of the grinding rollers that cooperates with the grinding track is also covered with a non-metallic wear-resistant layer. This vertical quartz sand mill can effectively reduce the heat accumulation of the grinding disc and grinding rollers, thereby reducing their wear rate, and also prevents contamination of the quartz sand.

Description

Technical Field

[0001] This utility model relates to the field of quartz sand processing technology, specifically to a quartz sand vertical mill. Background Technology

[0002] Quartz sand is obtained by crushing, pulverizing, and grinding quartz sand. Grinding is generally done by a grinding mill, which is divided into horizontal and vertical types. Horizontal mills are mainly ball mills, which rely on the rotation of the cylinder to drive steel balls to fall freely and impact the material. Vertical mills are mainly roller mills, which use rollers to press the grinding disc to rotate and crush the material. For small particles of quartz sand, roller mills are currently the main type used, such as patent CN201110141508.X - a roller mill device for stabilizing the material layer and improving the grinding efficiency of fine particles.

[0003] Currently, roller mills typically use high-chromium cast iron, alloy steel, and other materials as the grinding discs and rollers. Although these materials are wear-resistant, they are prone to heat accumulation during long-term grinding, which accelerates the wear rate of the grinding discs and rollers. Worn grinding discs and rollers can also introduce iron filings into the ground quartz sand, contaminating the finished quartz sand product. Utility Model Content

[0004] In order to overcome one of the shortcomings of the existing technology, the purpose of this utility model is to provide a vertical quartz sand mill that can effectively reduce the heat accumulation of the grinding disc and grinding roller, thereby reducing the wear rate of both, and also avoid contaminating the quartz sand.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A vertical quartz sand mill includes a frame, a grinding disc mounted on the frame, and several grinding rollers rotatably mounted on the frame. All the grinding rollers rotate around a vertical axis. The grinding disc is provided with a grinding track that mates with the grinding rollers. A cooling channel is provided on the vertical axis, extending into the roller shaft of the grinding rollers. Several air vents are provided on the non-rolling side of the grinding rollers, and the air vents communicate with the cooling channel inside the roller shaft. The inner wall of the grinding track is provided with a non-metallic wear-resistant layer, and the side of the grinding rollers that mates with the grinding track is also covered with a non-metallic wear-resistant layer.

[0007] Furthermore, the non-metallic wear-resistant layer is one of tungsten carbide coating, zirconia ceramic layer, or alumina ceramic layer.

[0008] Furthermore, the non-metallic wear-resistant layer on the grinding roller includes a substrate and a surface layer. The substrate covers the sidewall of the grinding track and the sidewall of the grinding roller that mates with the grinding track, respectively, and the surface layer is disposed on the outer surface of the substrate.

[0009] Furthermore, the substrate covering the outer periphery of the grinding roller consists of two semi-rings, the cross-section of which is U-shaped, and the inner surfaces of which are connected by a connecting block.

[0010] Furthermore, the substrate is made of high manganese steel or Q235 steel.

[0011] Furthermore, a one-way valve is provided on the air outlet.

[0012] Furthermore, a protective cover is provided on the outside of the vent hole of the one-way valve, the protective cover is provided with several holes, and a sand discharge hole is provided at the bottom of the protective cover.

[0013] Furthermore, the vent is provided with a protrusion, and the one-way valve can abut against the side wall of the protrusion on the corresponding side.

[0014] Furthermore, a protective cylinder is provided on the outer periphery of the grinding disc on the frame, and a cover is provided on the top of the protective cylinder. A feed port is provided on the cover, and the upper end of the vertical shaft extends through the cover. A drive motor is provided on the frame, and the drive motor is connected to the end of the vertical shaft that extends through the cover via a belt. A discharge port is provided at the lower end of the protective cylinder, and a flow channel communicating with the discharge port is provided between the protective cylinder and the outer periphery of the grinding disc. A mesh is provided on the outer periphery of the grinding disc.

[0015] Furthermore, a conveyor belt is provided at the bottom of the millstone on the frame, and the conveyor belt can receive the material discharged from the outlet.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model discloses a vertical quartz sand mill that improves upon existing grinding mills by modifying the grinding roller structure. Cooling channels are incorporated within the rotating roller shaft and vertical shaft. An external blower system sprays airflow through these channels to the area where the grinding disc and roller meet. This not only cools the surface and reduces wear, but also lifts the material at the interface, facilitating grinding – a double benefit. Furthermore, a non-metallic wear-resistant layer is applied to the inner wall of the grinding track and the outer circumference of the grinding roller. This structural design effectively improves the wear resistance of the roller and track while preventing metal wear and penetration, thus ensuring the quality of the quartz sand.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of a portion of the structure in an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the grinding disc and grinding roller in an embodiment of this utility model;

[0022] Figure 4 yes Figure 2 A magnified view of a portion of point A in the middle.

[0023] Explanation of icon numbers:

[0024] Frame 10, Protective cylinder 11, Cover 12, Feed inlet 13, Drive motor 14, Belt 15, Discharge outlet 16, Flow channel 17, Barrier net 18, Conveyor belt 19, Grinding disc 20, Grinding roller 30, Roller shaft 31, Air outlet 32, One-way valve 33, Protective cover 34, Hole 35, Sand discharge hole 36, Protrusion 37, Vertical shaft 40, Cooling channel 41, Non-metallic wear-resistant layer 50, Substrate 51, Surface layer 52. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0026] Reference Figures 1 to 4 A vertical quartz sand mill is shown, comprising a frame 10, a grinding disc 20 mounted on the frame 10, and several grinding rollers 30 rotatably mounted on the frame 10. All the grinding rollers 30 rotate around a vertical axis 40. The grinding disc 20 is provided with a grinding track 21 that cooperates with the grinding rollers 30. The vertical axis 40 is provided with a cooling channel 41 that extends into the roller shaft 31 of the grinding rollers 30. Several air outlets 32 are provided on the non-rolling side of the grinding rollers 30, and the air outlets 32 communicate with the cooling channel 41 in the roller shaft 31. The inner wall of the grinding track 21 is provided with a non-metallic wear-resistant layer 50, and the side of the grinding rollers 30 that cooperates with the grinding track 21 is also covered with a non-metallic wear-resistant layer 50.

[0027] In this embodiment, the roller shaft 31 is perpendicular to the vertical shaft 40. Two roller shafts 31 are provided, and similarly, two grinding rollers 30 are also provided, symmetrically arranged on opposite sides of the vertical shaft 40. This ensures dynamic balance during the rotation of the vertical shaft 40. It should be noted that in the above embodiment, the grinding roller 30 is cylindrical, and its outer circumference cooperates with the grinding track 21. Therefore, the air outlet 32 ​​is located on two sides of the grinding roller 30, specifically in areas close to its outer circumference. When external material, i.e., quartz sand, falls into the grinding track 21, the rotating grinding roller 30 will expel the material from the grinding track 21. During this process, the airflow from the air outlet 32 ​​can carry away the material, causing it to fly up or be pushed apart, thus creating a turbulent effect.

[0028] In one embodiment of this application, to prevent dust from flying during the grinding process, a protective cylinder 11 is provided on the outer periphery of the grinding disc 20 on the frame 10. A cover 12 is provided on the top of the protective cylinder 11, and a feed inlet 13 is provided on the cover 12. The upper end of the vertical shaft 40 extends through the cover 12. A drive motor 14 is provided on the frame 10. The drive motor 14 is connected to one end of the vertical shaft 40 that extends through the cover 12 via a belt 15. A discharge outlet 16 is provided at the lower end of the protective cylinder 11. A flow channel 17 communicating with the discharge outlet 16 is provided between the protective cylinder 11 and the outer periphery of the grinding disc 20. A baffle 18 is provided on the outer periphery of the grinding disc 20.

[0029] In the above embodiment, when the grinding roller 30 rotates within the grinding track 21, it squeezes the material out of the grinding track 21. At this time, the material is blocked by the screen 18. Only the material that meets the particle size requirement can pass through the screen 18 and fall into the flow channel 17, and finally through the discharge port 16. The material particles that do not meet the particle size requirement will fall back into the grinding track 21 under the action of gravity as the grinding roller 30 moves away, and wait for the next grinding. It should be noted that the airflow ejected from the vent 32 can carry up some material particles, allowing more material particles to fly up and eventually fall back into the grinding track 21. In addition, the airflow ejected from the vent 32 can also break up the large-diameter material deposited on the side of the screen 18 near the grinding track 21, preventing these large-diameter materials from accumulating in this area and affecting the passage of small-diameter materials through the screen 18, thus ensuring the normal operation of the screen 18.

[0030] In the above embodiment, in order to facilitate external conveying, the frame 10 is provided with a conveyor belt 19 at the bottom of the grinding disc 20, and the conveyor belt 19 can receive the material discharged from the outlet 16.

[0031] This vertical quartz sand mill improves upon existing grinding mills by modifying the structure of the grinding roller 30. Cooling channels 41 are incorporated within the roller shaft 31 and vertical shaft 40. An external blower system sprays air through these channels 41 onto the area where the grinding disc 20 and grinding roller 30 meet. This not only cools the area and reduces wear, but also lifts the material in the contact area, facilitating grinding – a double benefit. Furthermore, a non-metallic wear-resistant layer 50 is provided on the inner wall of the grinding track 21 and the outer periphery of the grinding roller 30. This structural design effectively improves the wear resistance of the grinding roller 30 and grinding track 21 while preventing metal wear and penetration, thus ensuring the quality of the quartz sand.

[0032] See Figures 1 to 2 In this application, in order to improve wear resistance and reduce the introduction of metal, the non-metallic wear-resistant layer 50 is one of tungsten carbide coating, zirconium oxide ceramic layer or alumina ceramic layer. This application preferably sprays tungsten carbide coating on the existing grinding roller 30 and grinding track 21. This treatment method is simpler and also facilitates later repair.

[0033] In the above embodiments, if a tungsten carbide coating is applied, the non-metallic wear-resistant layer 50 is rarely directly coated or installed on the sidewalls of the existing grinding track 21 or the sidewalls where the grinding roller 30 mates with the grinding track 21. Therefore, in one embodiment of this application, the non-metallic wear-resistant layer 50 includes a substrate 51 and a surface layer 52. The substrate 51 covers the sidewalls of the grinding track 21 and the sidewalls where the grinding roller 30 mates with the grinding track 21, respectively, and the surface layer 52 is disposed on the outer surface of the substrate 51. Through the above structural design, workers can more easily...

[0034] See Figure 3 Since the grinding roller 30 needs to rotate relative to each other, and in normal processing, if both components are wear parts, in order to improve the overall service life and reduce the difficulty of disassembly and assembly, one of the easier-to-disassemble components is usually chosen as the wear part, while the other component is generally more wear-resistant than the wear part. This way, the wear part is easier to disassemble and replace after wear, thus protecting the other component. Therefore, the substrate 51 covering the outer periphery of the grinding roller 30 consists of two semi-rings with U-shaped cross-sections, and the inner surfaces of the two semi-rings are connected by connecting blocks. This structural design facilitates the replacement of the non-metallic wear-resistant layer 50 on the outer periphery of the grinding roller 30 by operators, improving work efficiency. In this embodiment, the substrate 51 needs a certain degree of toughness to adapt to the pressure and friction of the rolling process. Therefore, the substrate 51 is made of high-manganese steel or Q235 steel, and the surface layer 52 is coated with a tungsten carbide coating. In some embodiments, the surface layer 52 can even be obtained by transplanting tungsten carbide particles or other hard ceramic particles onto the substrate 51.

[0035] See Figure 3 and Figure 4 In one embodiment of this application, in order to prevent external material particles from entering the cooling channel 41 through the air outlet 32 ​​during the rotation of the grinding roller 30, a one-way valve 33 is provided on the air outlet 32.

[0036] In the above-described improved embodiment, a protective cover 34 is provided on the outside of the vent 32 and the one-way valve 33. The protective cover 34 has several holes 35, and a sand discharge hole 36 is provided at its bottom. The main function of the protective cover 34 is to vent air and prevent compressed material from entering the vent 32. Furthermore, the main purpose of the sand discharge hole 36 is to allow material entering the protective cover 34 through the holes 35 to be smoothly discharged outwards.

[0037] In the above-mentioned improved scheme, a protrusion 37 is provided inside the air outlet 32, and the one-way valve 33 can abut against the side wall of the corresponding side of the protrusion 37. By designing the protrusion 37, the tightness of the one-way valve 33 in sealing the air outlet 32 ​​can be increased to a certain extent, avoiding excessive deformation of the one-way valve 33 due to excessive extrusion pressure during material rolling, which would cause external material to enter the cooling channel 41. It should be noted that in the actual process, the cooling channel 41 does not need to be constantly supplied with high-pressure cooling airflow. Cooling airflow is only supplied when the temperature of the entire grinding roller 30 exceeds the preset temperature. Therefore, in the actual production process, the one-way valve 33 is required to seal the air outlet 32.

[0038] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A vertical mill for quartz sand, comprising a frame, a grinding table arranged on the frame, and a plurality of grinding rollers rotatably mounted on the frame, all of the grinding rollers rotating about a vertical axis, the grinding table being provided with a grinding track cooperating with the grinding rollers, characterized in that A cooling channel is provided on the vertical shaft, and the cooling channel extends into the roller shaft of the grinding roller. Several air outlets are provided on the non-rolling side of the grinding roller, and the air outlets are connected to the cooling channel inside the roller shaft. A non-metallic wear-resistant layer is provided on the inner wall of the grinding track, and a non-metallic wear-resistant layer is also provided on the side of the grinding roller that mates with the grinding track.

2. A vertical mill for quartz sand according to claim 1, characterized in that: The non-metallic wear-resistant layer is one of tungsten carbide coating, zirconia ceramic layer, or alumina ceramic layer.

3. A vertical mill for quartz sand according to claim 1, characterized in that: The non-metallic wear-resistant layer on the grinding roller includes a substrate and a surface layer. The substrate covers the sidewall of the grinding track and the sidewall of the grinding roller that mates with the grinding track, respectively. The surface layer is disposed on the outer surface of the substrate.

4. A vertical quartz sand mill according to claim 3, characterized in that: The substrate covering the outer periphery of the grinding roller consists of two semi-rings, the cross-section of which is U-shaped, and the inner sides of which are connected by a connecting block.

5. A vertical quartz sand mill according to claim 3, characterized in that: The substrate is made of high manganese steel or Q235 steel.

6. A vertical quartz sand mill according to any one of claims 1-5, characterized in that: A one-way valve is provided on the air outlet.

7. A vertical quartz sand mill according to claim 6, characterized in that: The vent is located on the outside of the one-way valve and is protected by a protective cover. The protective cover has several holes and a sand discharge hole at the bottom.

8. A vertical quartz sand mill according to claim 6, characterized in that: The vent hole is provided with a protrusion, and the one-way valve can abut against the side wall of the protrusion.

9. A vertical quartz sand mill according to any one of claims 1-5, characterized in that: The frame is equipped with a protective cylinder on the outer periphery of the grinding disc. The top of the protective cylinder is equipped with a cover, and the cover has a feed inlet. The upper end of the vertical shaft extends through the cover. The frame is equipped with a drive motor, which is connected to the end of the vertical shaft that extends through the cover via a belt. The lower end of the protective cylinder is equipped with a discharge outlet. A flow channel communicating with the discharge outlet is provided between the protective cylinder and the outer periphery of the grinding disc. The outer periphery of the grinding disc is equipped with a mesh screen.

10. A vertical quartz sand mill according to claim 9, characterized in that: The frame is equipped with a conveyor belt at the bottom of the grinding disc, and the conveyor belt can receive the material discharged from the outlet.

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