Wheel roller mill capable of easily and quickly replacing grinding roller

Abstract

A wheel-roller mill with multiple layers of millstones and multiple combined grinding rollers can be applied to multiple fields of building materials, metallurgy, chemical engineering and the like, the wheel-roller mill is formed by overlapping the multiple layers of millstones horizontally mounted in the middle of the mill according to the principle that the multiple layers of millstones are extruded and ground, and the multiple combined grinding rollers are mounted on the upper edge of each millstone and rotate along with the millstones. The grinding ring is installed on the inner wall of the grinding machine shell, the grinding ring is fixed, a plurality of arc-shaped grinding channels are designed on the inner wall of the grinding ring, materials are extruded and ground between contact surfaces between the arc-shaped grinding channels of the grinding ring and the grinding rollers, and due to the fact that the number of the grinding rollers is large, the grinding area is large, the materials are repeatedly extruded and ground, and the purpose of superfine grinding is achieved. And a plurality of manual maintenance channels are arranged at the half position from the edge to the central part of the millstone, so that the grinding roller can be quickly replaced, the maintenance is convenient, the equipment can be large-sized, the yield is greatly improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to an ultrafine grinding device in the technical fields of building materials, metallurgy, and chemical engineering, and particularly relates to a wheel roller mill that is easy to quickly replace grinding rollers, and is especially suitable for the processing of non-metallic minerals. Background Art

[0002] Currently, as is well known, for the same type of grinding equipment in use, due to difficult maintenance or a long maintenance cycle, that is, the entire upper housing needs to be lifted open, and the grinding roller bracket needs to be lifted upwards to carry out work, or due to maintenance problems, the equipment size is limited and it is difficult to be large-sized. Summary of the Invention

[0003] In order to overcome the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a wheel roller mill that is easy to quickly replace grinding rollers, which can meet the requirements of large-scale ultrafine grinding production of various materials.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A wheel roller mill that is easy to quickly replace grinding rollers, including multiple layers of grinding discs 7 horizontally installed in the middle of the mill. Multiple combined grinding rollers 8 are installed on the upper edge of each grinding disc 7, and are sealed with a rubber magnetic sealing plate 18. Multiple manual maintenance channels 12 are provided at the midpoint from the edge to the center of the grinding disc 7, leading from the top of the grinding disc 7 straight down to the bottom platform of the mill. Each grinding disc 7 is stacked vertically on top of each other and connected into a whole with bolts. A vertical speed reducer 16 is fixedly installed below the bottommost grinding disc 7. The vertical speed reducer 16 is connected to the motor 17 to drive all the grinding discs 7 and the combined grinding rollers 8 to rotate around the common vertical axis of the mill center, and its rotation speed is fixed or adjustable; in addition to rotating around the common vertical axis, the grinding roller 8-1 on the combined grinding roller 8 also rotates around the roller shaft of the grinding roller bracket 8-2 under the action of friction force; it also includes a grinding ring 9 installed on the inner wall of the mill housing 6. The grinding ring 9 is fixed and immovable, and multiple arc-shaped grinding tracks are designed on its inner wall. The shape of the arc-shaped grinding tracks is the same as the shape of the grinding roller 8-1, and the number of arc-shaped grinding tracks is the same as the number of layers in which the combined grinding rollers 8 are distributed; when the grinding discs 7 rotate together, the grinding roller 8-1 on the combined grinding roller 8 is pressed against the grinding ring 9 under the action of centrifugal force and rotates along with the arc-shaped grinding track of the grinding ring 9 under the action of friction force, and the material is squeezed and ground between the contact surface between the arc-shaped grinding track of the grinding ring 9 and the grinding roller 8-1. When the wheel roller mill is running, all the grinding discs 7 rotate, and the material begins to fall to the center of the sealing cover 24. Under the action of centrifugal force, the material moves from the center to the edge, and the material moves downward along the grinding track 10 under the action of gravity. When passing through multiple layers of grinding rings 9, it is squeezed and ground by multiple grinding rollers 8-1, and finally the material is discharged from the edge of the bottommost grinding disc 7. Due to the large number of grinding rollers 8-1 and the large grinding area, the purpose of ultrafine grinding is achieved.

[0006] The described grinding disc 7 is an integral structure of a disc-shaped spoke steel body, with high strength. The upper grinding disc and the lower grinding disc are connected by bolts. The upper and lower grinding discs are alternately installed with a half-offset of the grinding roller. The number of grinding discs 7 is 1 to 50, commonly 2 to 30, and the number of arc-shaped grinding tracks in the grinding ring 9 matches it; multiple positioning grooves are machined at the outer edge of each grinding disc 7 for fixing the combined grinding roller 8. At the midpoint from the edge to the center of the grinding disc 7, multiple manual maintenance channels 12 are provided and isolated by spokes; the diameter of the grinding disc 7 is between Φ2000 and Φ10000 mm, and the commonly used diameter is between Φ2000 and Φ6000 mm; the rotational speed of the grinding disc 7 driven by the vertical reducer 16 is usually 30 to 180 revolutions per minute, and the most commonly used grinding disc speed is 30 to 120 revolutions per minute. The grinding disc speed is continuously adjustable or a fixed speed to meet the requirements of different materials and various production processes.

[0007] The number of the described combined grinding rollers 8 distributed on each layer of the grinding disc 7 is 20 to 80. The combined grinding roller 8 is composed of multiple parts. The combined grinding roller 8 includes a grinding roller 8-1, a grinding roller frame 8-2, an adjusting screw 8-3, and an elastic element 8-4; the outer shape of the grinding roller 8-1 is like an abacus bead, freely sleeved on the rotating shaft of the grinding roller frame 8-2, horizontally placed. The inner diameter of the grinding roller 8-1 is 20 to 30 mm larger than the diameter of the rotating shaft, and it can rotate freely. The outer diameter is between Φ200 and Φ250 mm, and the height is ~100 mm.

[0008] All the combined grinding rollers 8 on each layer of the grinding disc 7 are divided into several areas for easy maintenance and sealing. At the midpoint from the edge to the center of the grinding disc 7, multiple manual maintenance channels 12 are provided, leading directly from the top of the grinding disc 7 to the bottom platform of the mill. When disassembling the combined grinding roller 8, first remove the rubber magnetic sealing plate 18 from the sealing position, rotate the adjusting screw 8-3 downward to disengage the elastic element 8-4, and the combined grinding roller 8 can be smoothly removed from the working area in parallel. It is transported by machinery or manually and sent out of the mill through the manual maintenance channel 12. The installation sequence is the opposite.

[0009] The described rubber magnetic sealing plate 18 is made of a temperature-resistant elastic rubber material, such as tetrapropylene fluoride rubber and fluorosilicone rubber. The permanent magnet ring 18-1 is a flexible temperature-resistant permanent magnetic material, distributed around the magnetic sealing plate 18. The width of the permanent magnet ring 18-1 is 25 mm, which can generate a strong magnetic force on rigid materials and attract them to the sealing position of the grinding disc 7. It does not fall off under the influence of temperature and vibration and can be removed by force.

[0010] The grinding roller 8-1, the grinding roller frame 8-2, and the grinding ring 9 are made of high-hardness wear-resistant alloy materials.

[0011] The described roller mill also includes a storage bin 1, a lattice feeder 2, and a feeding pipe 3 feeding system. The lattice feeder 2 controls the feeding amount, and the feeding pipe 3 is arranged above the sealing cover 24.

[0012] The described roller mill further includes a high-speed separator 4 and a collecting hopper 5. The high-speed separator 4 is installed at the uppermost part of the casing. A plurality of separators are installed around it, with the number being 2 to 6. The lower outlet of the high-speed separator 4 is connected to the collecting hopper 5, and the returned unqualified materials return to the grinding area.

[0013] The described roller mill further includes a main air duct 19, a bag filter 20, a finished product bin 21, an induced draft fan 22, and a chimney 23. The bag filter 20 is a finished product collector. Qualified products enter the finished product bin 21, and the clean air is discharged into the atmosphere through the induced draft fan 22 and the chimney 23.

[0014] The described roller mill further includes scraping plates 13, an air inlet 14, and a discharge outlet 15. A plurality of scraping plates 13 are provided below the lower layer of the grinding disc 7 and rotate together with the grinding disc. An air inlet 14 is arranged outside the scraping plates 13, and a discharge outlet 15 is arranged below the scraping plates 13. Large particles are scraped into the discharge outlet and discharged outside the mill.

[0015] For the described roller mill, the cold and hot air entering the mill is first introduced from the air inlet 14. The air flow passes upward through the contraction opening 26 and the rising channel 11, and the ground material is carried upward to the high-speed separator 4 for sorting at the powder grinding material outlet 25. The hot air entering the mill is less than 200 °C, and the inside of the mill operates under negative pressure.

[0016] Compared with the prior art, since the present invention is convenient for maintenance, it can make the equipment large-scale, greatly improve the output, reduce the cost, and quickly move the combined grinding rollers 8 outside the mill for maintenance, reducing the maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view schematic diagram of the main structure of the present invention.

[0018] Figure 2 is a schematic diagram of the horizontal distribution of the combined grinding rollers of the present invention.

[0019] Figure 3 is a front view schematic diagram of the main structure of the present invention with the combined grinding rollers removed.

[0020] Figure 4 is a front view schematic diagram of the structure of a single grinding disc in the main structure of the present invention.

[0021] Figure 5 is a top view schematic diagram of the structure of a single grinding disc in the main structure of the present invention.

[0022] Figure 6 is a schematic diagram of the structure of the combined grinding rollers of the present invention.

[0023] Figure 7 is a schematic diagram of the structure of the grinding roller of the present invention.

[0024] Figure 8 It is a schematic structural diagram of the roller frame of the present invention.

[0025] Figure 9 It is a schematic structural diagram of the rubber magnetic sealing plate of the present invention.

[0026] Figure 10 It is a schematic elevation view of the manual maintenance passage of the present invention.

[0027] Figure 11 It is a schematic plan view of the manual maintenance passage of the present invention.

[0028] Figure 12 It is a schematic diagram of the combined grinding roller being removed from the working position of the present invention.

[0029] Figure 13 It is a schematic diagram of the material flow direction inside the mill of the present invention.

[0030] Figure 14 It is a schematic diagram of the air flow direction inside the mill of the present invention.

[0031] Figure 15 It is a schematic diagram of the external pipeline of the mill of the present invention.

[0032] In the figure: 1. storage bin, 2. sizing feeder, 3. feed pipe, 4. high-speed separator, 5. aggregate hopper, 6. mill housing, 7. grinding table, 8. combined grinding roller, 8-1. grinding roller, 8-2. roller frame, 8-3. adjusting screw, 8-4. elastic element, 9. grinding ring, 10. grinding path, 11. rising channel, 12. manual maintenance passage, 13. scraping plate, 14. air inlet, 15. discharge port, 16. vertical speed reducer, 17. motor, 18. rubber magnetic sealing plate, 18-1. permanent magnet ring, 19. main air duct, 20. bag filter, 21. finished product bin, 22. induced draft fan, 23. chimney, 24. sealing cover, 25. grinding material outlet, 26. reduced opening. Detailed implementation manners

[0033] The following will describe in detail the implementation manners of the present invention with reference to the accompanying drawings and embodiments.

[0034] As Figure 1As shown in the figure, a roller mill that is easy to quickly replace grinding rollers includes multiple grinding discs 7 horizontally installed in the middle of the mill. Multiple combined grinding rollers 8 are installed on the upper edges of each grinding disc 7. A grinding ring 9 is installed on the inner wall of the mill housing 6. The grinding ring 9 is fixed and has multiple arc-shaped grinding tracks designed on its inner wall. The shape of the arc-shaped grinding tracks is the same as that of the grinding roller 8-1, and the number of arc-shaped grinding tracks is the same as the number of layers in which the combined grinding rollers 8 are distributed. Its working principle is as follows: The motor 17 drives all the grinding discs 7 to rotate through the vertical speed reducer 16. In addition to revolving, the grinding roller 8-1 on the combined grinding roller 8, due to the action of centrifugal force, tightly presses the arc-shaped grinding track of the grinding ring 9 at its outer edge. Under the action of friction, the grinding roller 8-1 rotates along with the arc-shaped grinding track of the grinding ring 9 around the rotating shaft; The material passes through the storage bin 1, the lattice feeder 2, and the feeding pipe 3 and reaches the sealing cover 24 directly, and then flows through the grinding track 10 from top to bottom. In the grinding track 10, the material is repeatedly extruded and ground by multiple grinding rollers 8-1 in each layer, and the material is ground into fine powder; The fine powder is thrown out from the grinding material outlet 25, carried by the hot and cold air coming from the air inlet 14 and undergoes heat exchange, and then passes upward through the rising channel 11 with the upward airflow and enters the high-speed separator 4 for separation. The qualified products enter the bag filter 20 and then enter the finished product bin 21, and the unqualified products return to the mill through the aggregate hopper 5 for re-grinding; The coarse particles coming out from the grinding material outlet 25 fall downward and are scraped out by the scraping plate 13 and discharged out of the mill through the discharge port 15.

[0035] When the combined grinding roller 8 is to be disassembled during shutdown, the worker enters the manual maintenance passage 12. First, remove the rubber magnetic sealing plate 18, and rotate the adjusting screw 8-3 downward so that the elastic element 8-4 is disengaged. Then the combined grinding roller 8 can be smoothly and horizontally moved out of the working area, and it can be transported mechanically or manually and sent out of the mill through the manual maintenance passage 12 for repair. Then install a normal combined grinding roller 8, which can speed up the maintenance speed and can be repaired for multiple ones centrally.

[0036] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to it as equivalent embodiments within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A roller mill with which the rollers can be replaced quickly and easily, characterized in that: The mill comprises a plurality of grinding discs 7 installed horizontally in the middle of the mill, a plurality of combined grinding rollers 8 are installed on the upper edge of each grinding disc 7, and a rubber magnetic sealing plate 18 is used to seal the grinding disc 7. A plurality of manual maintenance channels 12 are arranged at the half of the distance from the edge to the center of the grinding disc 7. Each grinding disc 7 is stacked on top of each other in the vertical direction and connected as a whole by bolts. A vertical reducer 16 is fixedly arranged below the bottom grinding disc 7. The vertical reducer 16 is connected to a motor 17 to drive all the grinding discs 7 and the combined grinding rollers 8 to rotate around the common vertical axis of the mill center, and the speed thereof is fixed or adjustable. In addition to rotating around the common vertical axis, the combined grinding rollers 8 , wherein the grinding roller 8-1 on the combined grinding roller 8 also rotates around the roller axis of the grinding roller frame 8-2 under the action of friction force; it also includes a grinding ring 9 installed on the inner wall of the mill housing 6, the grinding ring 9 is fixed, and a plurality of arc-shaped grinding tracks are designed on its inner wall, the shape of the arc-shaped grinding tracks is consistent with the shape of the grinding roller 8-1, and the number of the arc-shaped grinding tracks is consistent with the number of layers of the combined grinding roller 8; when the grinding disc 7 rotates together, the grinding roller 8-1 on the combined grinding roller 8 is pressed against the grinding ring 9 by the centrifugal force, and rotates along the arc-shaped grinding track of the grinding ring 9 under the action of friction force, and the material is squeezed and ground between the contact surface between the arc-shaped grinding track of the grinding ring 9 and the grinding roller 8-1.

2. A roller mill for easily and quickly replacing grinding rollers according to claim 1, characterized in that: The grinding disc 7 is a disk-shaped spoke steel body with high strength. The upper grinding disc is connected to the lower grinding disc by bolts. The upper and lower grinding discs are installed alternately with half a grinding roller. The number of grinding discs 7 is 1 to 50, and 2 to 30 are commonly used, which matches the number of arc grinding tracks in the grinding ring 9. A plurality of positioning grooves are processed on the outer edge of each grinding disc 7 for fixing the combined grinding roller 8. A plurality of manual maintenance channels 12 are arranged at half of the distance from the edge to the center of the grinding disc 7, which are isolated by spokes. The diameter of the grinding disc 7 is between Φ2000 and Φ10000 mm, and the commonly used diameter is between Φ2000 and Φ6000 mm. The speed at which the vertical reducer 16 drives the grinding disc 7 to rotate is usually 30 to 180 rpm, and the most commonly used grinding disc speed is 30 to 120 rpm. The grinding disc speed can be continuously adjusted or fixed to meet the requirements of different materials and various production processes.

3. The roller mill with easy and quick roller replacement according to claim 1, characterized in that: The number of combined grinding rollers 8 distributed on each layer of grinding disc 7 is 20 to 80. The combined grinding rollers 8 are composed of multiple parts. The combined grinding rollers 8 include a grinding roller 8-1, a grinding roller frame 8-2, an adjusting screw 8-3, and an elastic element 8-4. The grinding roller 8-1 has an abacus bead shape and is freely mounted on the rotating shaft of the grinding roller frame 8-2 and placed horizontally. The inner diameter of the grinding roller 8-1 is 20 to 30 mm larger than the diameter of the rotating shaft and can rotate freely. The outer diameter is between Φ200 and Φ250 mm, and the height is 100 mm.

4. The roller mill for easily and quickly replacing the grinding roller according to claim 1, characterized in that: All the combined grinding rollers 8 distributed on each layer of the grinding disc 7 are divided into several areas for easy maintenance and sealing. A plurality of manual maintenance channels 12 are provided at the halfway point from the edge to the center of the grinding disc 7, which extend from the top of the grinding disc 7 down to the bottom platform of the mill. When disassembling the combined grinding rollers 8, first remove the rubber magnetic sealing plate 18 from the sealing position, and rotate the adjusting screw 8-3 downward to disengage the elastic element 8-4. The combined grinding rollers 8 can then be smoothly moved out of the working area in parallel, and transported mechanically or manually, and sent out of the mill through the manual maintenance channel 12. The loading order is reversed.

5. The roller mill for easily and quickly replacing the grinding roller according to claim 1, characterized in that: The rubber magnetic sealing plate 18 is made of a temperature-resistant elastic rubber material, such as tetrafluoroethylene rubber and fluorosilicone rubber. The permanent magnetic ring 18-1 is a flexible temperature-resistant permanent magnetic material and is distributed around the magnetic sealing plate 18. The permanent magnetic ring 18-1 is 25 mm wide and can generate a strong magnetic force on the rigid material, attracting it to the sealing position of the grinding disc 7. It will not fall off due to temperature and vibration and can be removed with force.

6. The roller mill for easily and quickly replacing the grinding roller according to claim 1, characterized in that: The grinding roller 8-1, the grinding roller frame 8-2 and the grinding ring 9 are made of high-hardness wear-resistant alloy material.

7. The roller mill for easily and quickly replacing the grinding roller according to claim 1, characterized in that: It also includes a high-speed classifier 4 and a collecting hopper 5. The high-speed classifier 4 is installed on the top of the casing. Multiple classifiers are installed around the casing, with a number of 2 to 6. The lower port of the high-speed classifier 4 is connected to the collecting hopper 5. The returned unqualified materials return to the grinding area. The hot air entering the mill is less than 200°C, and the mill is operated under negative pressure.

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