Roll mill coarse material discharging and returning device

Abstract

The utility model relates to the technical field of raw material crushing, in particular to a rolling mill coarse material receiving and returning device, which is characterized in that a separating mechanism is arranged at the lower end of a grinding roller, the separating mechanism comprises a coarse material receiving channel and a fine material channel, different materials ground by the grinding roller can be separated, the coarse materials enter the coarse material receiving channel, and the fine materials enter the fine material receiving channel. Fine materials enter the fine material channel, then coarse materials return to the grinding roller through the coarse material return mechanism to be ground again, and the coarse materials which are not completely crushed and depolymerized can be timely taken out and returned before rolling and grinding and then are crushed and depolymerized, so that coarse particles are reduced, the uniformity of the fineness of powder particles is realized, and the quality of post-processed products and the quality of final products are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of raw material crushing, in particular to a roller mill coarse material receiving and returning device. Background Art

[0002] The sulfuric acid process for producing rutile titanium dioxide includes three steps: titanium solution preparation, TiO2 preparation and intermediate pulverization, and TiO2 post-processing. Titanium concentrate is passed through the titanium solution to produce a qualified hydrolyzed titanium solution, which is then hydrolyzed to produce metatitanic acid. The hydrolyzed metatitanic acid is purified to remove impurities, seed crystals and a salt treatment agent are added, and high-temperature calcination is performed in a rotary kiln to produce a primary TiO2 titanium dioxide with pigmentary properties. This primary product has strong binding properties and requires dry pulverization for deagglomeration. Dispersants and desalted water are then added for slurrying and dispersion. Finally, wet grinding is performed to produce a uniformly fine TiO2 slurry, providing qualified raw material for the inorganic coating in the TiO2 post-processing stage.

[0003] The TiO2 intermediate pulverization process is primarily divided into three major steps: dry pulverization, beating and dispersion, and wet grinding. Currently, the dry pulverization process commonly utilizes roller mills. Roller mills utilize counter-rotating rollers, which continuously pass the primary titanium dioxide product through the gap between the two rollers. The rotating rollers exert a squeezing force on the primary titanium dioxide product, eliminating the strong binding forces between the primary TiO2 particles and achieving fragmentation and deagglomeration. Because the uniformity of the material passing between the rollers varies, the magnitude of the roller squeezing force varies. Currently, the squeezing force in the middle of the rollers is relatively uniform and high, resulting in better fragmentation and deagglomeration of the primary titanium dioxide product. However, the squeezing force at the edges of the rollers is relatively low, and the force applied to the primary titanium dioxide product is uneven. This results in poor fragmentation and deagglomeration of the primary titanium dioxide product at the edges, as the strong binding forces between the primary TiO2 particles are not fully eliminated, resulting in a high amount of coarse material. This material, when fed into the subsequent beating and dispersion and wet grinding processes, produces a high number of coarse particles and uneven TiO2 particle fineness, impacting the quality of the inorganic coating and the final product.

[0004] Therefore, there is an urgent need to develop a roller mill device that can secondary crush the coarse material that is not completely crushed and deagglomerated to achieve uniform TiO2 particle fineness. Utility Model Content

[0005] In view of this, the utility model provides a roller mill coarse material discharge and return device including an outer shell, a grinding mechanism, a separation mechanism, a pulping trough and a coarse material return mechanism; the grinding mechanism and the separation mechanism are arranged inside the outer shell, the separation mechanism is arranged below the grinding mechanism, and the separation mechanism is provided with one or more channels according to the different positions of the coarse material and the fine material in the material after grinding by the grinding mechanism. The channel has a structure that passes through from top to bottom and includes a coarse material discharge channel and a fine material discharge channel, the pulping trough is arranged below the fine material discharge channel, and the coarse material return mechanism is arranged below the coarse material discharge channel.

[0006] In some embodiments, the grinding mechanism includes a pair of grinding rollers arranged opposite to each other, and the grinding rollers include roller shafts, one end of which is rotatably connected to the inner side of the outer shell, and the other end is connected to a first drive device, and the first drive device is fixed on the inner side or outer side of the outer shell.

[0007] In some embodiments, the coarse material outlet channel in the separation mechanism includes a first coarse material outlet channel and a second coarse material outlet channel from left to right; the fine material outlet channel in the separation mechanism includes a fine material channel located between the first coarse material outlet channel and the second coarse material outlet channel; the outer walls of the first coarse material outlet channel and the second coarse material outlet channel facing the fine material channel are both set at an angle to the fine material channel, so that the directions of the bottom end openings of the first coarse material outlet channel and the second coarse material outlet channel are staggered with the direction of the bottom end opening of the fine material channel along a direction perpendicular to the extension direction of the roller axis.

[0008] In some embodiments, the coarse material return mechanism includes one or more conveyor belts, and the conveyor belts are arranged to correspond to the bottom end openings of the first coarse material outlet channel and the second coarse material outlet channel.

[0009] In some embodiments, the coarse material return mechanism also includes a feeding device; the feeding device includes a feed hopper, a feeding mechanism and a discharge port, the feed hopper opening is facing the end of the conveyor belt transmission direction, one end of the feeding mechanism is connected to the end of the feed hopper, and the other end of the feeding mechanism is connected to the discharge port, and the discharge port is facing the top of the grinding mechanism.

[0010] In some embodiments, the feeding device includes a bucket elevator or a screw conveyor.

[0011] In some embodiments, a coarse material collection channel with two through ends is provided at the end of the conveyor belt along the transmission direction, and a bracket is provided under the conveyor belt. The coarse material collection channel is fixed on the side of the bracket. The coarse material collection channel is a funnel structure with a top cross-sectional area larger than a bottom cross-sectional area, including a collecting port and a transport port. The collecting port faces the end of the conveyor belt, and the transport port faces the feed hopper.

[0012] In some embodiments, an annular clamping portion is provided on the inner edge of the bottom of the fine material channel, and a screen adapted to the fine material channel is clamped on the clamping portion.

[0013] In some embodiments, the first coarse material discharge channel is an inverted Y-shaped structure, including a first discharge channel and a second discharge channel, and the material outlet of the first discharge channel and the material outlet of the second discharge channel are distributed on both sides of the fine material channel. At the same time, the second coarse material discharge channel is an inverted Y-shaped structure, including a third discharge channel and a fourth discharge channel, and the third discharge channel and the fourth discharge channel are distributed on both sides of the fine material channel; the conveyor belt includes a first belt and a second belt, the first discharge channel and the third discharge channel face the first belt, and the second discharge channel and the fourth discharge channel face the second belt; the feeding equipment includes a first feeding equipment and a second feeding equipment, the end of the first belt along the material conveying direction faces the first feeding equipment, and the end of the second belt along the material conveying direction faces the second feeding equipment.

[0014] In some embodiments, outer walls of the first coarse material outlet channel and the second coarse material outlet channel are both provided with vibration motors.

[0015] The beneficial effects of this utility model are as follows: The coarse material discharge and return device of the roller mill is divided into two parts: the coarse material discharge and the coarse material return. The coarse material discharge section is integrated with the existing equipment (fine material channel), resulting in a simple structure and easy fabrication and installation. The separation mechanism of this utility model effectively separates coarse and fine materials, preventing coarse material from entering the subsequent production process. The coarse material return mechanism of this device fully utilizes existing conditions, promptly discharging and returning incompletely crushed and deagglomerated coarse material to the grinding mechanism for further crushing and deagglomeration. This reduces coarse particles, achieves uniform material fineness, and ensures the quality of the inorganic coating after post-processing and the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the structure of the coarse material discharge and return device of the roller mill provided in some embodiments of the present utility model;

[0018] Figure 2 Schematic diagram of the conveyor belt, feeding equipment, and coarse material collection channel in the structure of the roller mill coarse material delivery and return device provided in some embodiments of the present utility model;

[0019] Figure 3 A schematic diagram of the structure of the coarse material discharge and return device of the roller mill provided in some embodiments of the present utility model;

[0020] Figure 4 This is a top view of a roller mill coarse material discharging device in the roller mill coarse material discharging and returning device structure provided in some embodiments of the present invention.

[0021] Description of Reference Numerals

[0022] 1. Grinding roller; 2. First coarse material outlet channel; 201. First discharge channel; 202. Second discharge channel; 3. Fine material channel; 4. Second coarse material outlet channel; 401. Third discharge channel; 402. Fourth discharge channel; 5. First driving device; 6. Beating trough; 7. Conveyor belt; 701. First belt; 702. Second belt; 8. Feed hopper; 9. Feeding mechanism; 10. Discharge port; 11. Casing; 12. Bracket; 13. Collection port; 14. Transport port. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0024] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0025] like Figure 1As shown, the utility model provides a roller mill coarse material receiving and returning device, comprising a shell 11, a grinding mechanism, a separation mechanism, a beating trough 6 and a coarse material return mechanism; the grinding mechanism and the separation mechanism are arranged inside the shell 11, the separation mechanism is arranged below the grinding mechanism, the separation mechanism is provided with one or more channels according to the different positions of the coarse material and the fine material in the material after grinding by the grinding mechanism, the channels have a vertical through structure and include a coarse material receiving channel and a fine material receiving channel, the beating trough 6 is arranged below the fine material receiving channel, and the coarse material return mechanism is arranged below the coarse material receiving channel. The reason for such arrangement is that: when the grinding mechanism grinds the material during the production process, since the grinding mechanism is provided with a grinding roller 1 or other stirring grinding elements, the grinding element often grinds the material at a specific position of the grinding element evenly and finely during long-term operation, while the material at a specific position of the grinding element may not be fully ground, resulting in a coarse particle size. The device of the present invention solves the problem of inevitable different coarseness and fineness of materials at specific positions in the grinding mechanism. One or more channels are provided according to the different positions of coarse and fine materials in the materials ground by the grinding mechanism. The channels have a vertically through-through structure and include a coarse material outlet channel and a fine material outlet channel. The fine material is taken out from the fine material channel 3 and proceeds to the next step. The coarse material is taken out from the coarse material channel and enters the coarse material return grinding mechanism for re-grinding, thereby reducing the coarse material and achieving uniform material fineness.

[0026] In some embodiments, the grinding mechanism includes a pair of grinding rollers 1 disposed opposite each other, each of the grinding rollers 1 including a roller shaft, one end of which is rotatably connected to the inside of the housing 11, and the other end of which is connected to a first drive device 5, which is fixed to the inside or outside of the housing 11. In some embodiments, the grinding rollers 1 can be cylindrical or spindle-shaped.

[0027] In some embodiments, when the grinding roller 1 is spindle-shaped, the coarse material outlet channel in the separation mechanism includes a first coarse material outlet channel 2 and a second coarse material outlet channel 4 from left to right; the fine material outlet channel in the separation mechanism includes a fine material channel 3 located between the first coarse material outlet channel 2 and the second coarse material outlet channel 4; in actual operation, more fine materials are ground in the middle of the grinding roller 1, and more coarse materials are ground at both ends of the grinding roller 1. The present invention divides the interface of the separation mechanism below the grinding roller 1 into the first coarse material outlet channel 2, the second coarse material outlet channel 4 and the fine material channel 3 (such as Figure 4As shown, the top openings of the first coarse material outlet channel 2 and the second coarse material outlet channel 4 face the area of ​​the grinding roller 1 where coarse material is concentrated, while the top interface of the fine material channel 3 faces the center of the grinding roller 1 where fine material is concentrated. This allows for separate processing of fine and coarse materials. The coarse material then re-enters the grinding roller 1 for grinding via the coarse material return mechanism, improving particle size uniformity. This device has a simple structure and is easy to manufacture and install. It effectively separates coarse and fine materials, preventing coarse material from entering subsequent production processes. The coarse material return mechanism fully utilizes existing conditions, allowing the coarse material to quickly return to the grinding mechanism for re-crushing and deagglomeration. This ensures uniform material fineness and ensures the quality of post-processed products.

[0028] Therefore, according to the above, in some embodiments of the present invention, the top openings of the first coarse material outlet channel 2 and the second coarse material outlet channel 4 are respectively located below the two ends of the grinding roller 1; the top opening of the fine material channel 3 is located below the middle part of the grinding roller 1.

[0029] The outer walls of the first coarse material outlet channel 2 and the second coarse material outlet channel 4 facing the fine material channel 3 are set at an angle to the fine material channel 3, so that the directions of the bottom openings of the first coarse material outlet channel 2 and the second coarse material outlet channel 4 are staggered with the direction of the bottom opening of the fine material channel 3 along the direction perpendicular to the extension direction of the roller axis, so that the coarse material and the fine material can be better separated.

[0030] In some embodiments, the coarse material return mechanism includes one or more conveyor belts 7, which are arranged to correspond to the bottom openings of the first coarse material outlet channel 2 and the second coarse material outlet channel 4. The function of the conveyor belt 7 is to transport the coarse material in a timely manner for the next process.

[0031] In some embodiments, the coarse material return mechanism also includes a feeding device; the feeding device includes a feed hopper 8, a feeding mechanism 9 and a discharge port 10, the feed hopper 8 opening is facing the end of the transmission direction of the conveyor belt 7, one end of the feeding mechanism 9 is connected to the end of the feed hopper 8, and the other end of the feeding mechanism 9 is connected to the discharge port 10, and the discharge port 10 is facing the top of the grinding mechanism, which can automatically return the coarse material for further grinding, thereby reducing labor costs.

[0032] In some embodiments, the material conveying equipment includes a bucket elevator or a screw conveyor. The utility model conveys materials through the bucket elevator or the screw conveyor of the prior art, and can transport materials efficiently.

[0033] In some embodiments, as Figure 2As shown, in some embodiments, a coarse material collecting channel with two through ends is provided at the end of the conveyor belt 7 along the transmission direction, and a bracket 12 is provided under the conveyor belt 7. The coarse material collecting channel is fixed on the side of the bracket 12. The coarse material collecting channel is a funnel structure with a top cross-sectional area larger than a bottom cross-sectional area, and includes a collecting port 13 and a transport port 14. The collecting port 13 faces the end of the conveyor belt 7, and the transport port 14 faces the feed hopper 8 of the feeding equipment.

[0034] In some embodiments, an annular clamping portion is provided on the inner edge of the bottom of the fine material channel 3, and a screen adapted to the fine material channel 3 is clamped on the clamping portion. The material is screened before entering the beating tank 6, which can further prevent coarse material from entering the beating tank 6.

[0035] In some embodiments, as Figure 3 As shown, the first coarse material discharge channel 2 is an inverted Y-shaped structure, including a first discharge channel 201 and a second discharge channel, and the material outlet of the first discharge channel 201 and the material outlet of the second discharge channel are distributed on both sides of the fine material channel 3. At the same time, the second coarse material discharge channel 4 is an inverted Y-shaped structure, including a third discharge channel 401 and a fourth discharge channel 402, and the third discharge channel 401 and the fourth discharge channel 402 are distributed on both sides of the fine material channel 3; the conveyor belt 7 includes a first belt 701 and a second belt 702, the first discharge channel 201 and the third discharge channel 401 are facing the first belt 701, and the fourth discharge channel 402 is facing the second belt 702; the feeding equipment includes a first feeding equipment and a second feeding equipment, the end of the first belt 701 along the material conveying direction is facing the first feeding equipment, and the end of the second belt 702 along the material conveying direction is facing the second feeding equipment. The above improvements can improve work efficiency.

[0036] In some embodiments, the outer walls of the first coarse material outlet channel 2 and the second coarse material outlet channel 4 are both provided with vibration motors, which can vibrate the coarse material out to prevent the coarse material from being blocked inside the first coarse material outlet channel 2 and the second coarse material outlet channel 4.

[0037] In some embodiments, the conveyor belt 7 includes two or more conveyor rollers and belts covering the conveyor rollers. The conveyor rollers are connected to the second driving device. Multiple conveyor rollers can make the conveying process smoother.

[0038] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A device for taking out and returning coarse material from a roller mill, characterized in that: The invention comprises an outer shell (11), a grinding mechanism, a separation mechanism, a beating trough (6) and a coarse material return mechanism; the grinding mechanism and the separation mechanism are arranged inside the outer shell (11), the separation mechanism is arranged below the grinding mechanism, the separation mechanism is provided with one or more channels according to the different positions of coarse and fine materials in the material after grinding by the grinding mechanism, the channels have a vertically through structure and include a coarse material outlet channel and a fine material outlet channel, the beating trough (6) is arranged below the fine material outlet channel, and the coarse material return mechanism is arranged below the coarse material outlet channel.

2. The roller mill coarse material receiving and returning device according to claim 1, characterized in that: The grinding mechanism comprises a pair of grinding rollers (1) arranged opposite to each other, the grinding rollers (1) comprising roller shafts, one end of the roller shaft being rotatably connected to the inner side of the housing (11), and the other end being connected to a first driving device (5), wherein the first driving device (5) is fixed to the inner side or the outer side of the housing (11).

3. The roller mill coarse material receiving and returning device according to claim 2, characterized in that: The coarse material outlet channel in the separation mechanism includes, from left to right, a first coarse material outlet channel (2) and a second coarse material outlet channel (4); the fine material outlet channel in the separation mechanism includes a fine material channel (3) located between the first coarse material outlet channel (2) and the second coarse material outlet channel (4); the outer walls of the first coarse material outlet channel (2) and the second coarse material outlet channel (4) facing the fine material channel (3) are both arranged at an angle to the fine material channel (3), so that the directions of the bottom openings of the first coarse material outlet channel (2) and the second coarse material outlet channel (4) are staggered with the direction of the bottom opening of the fine material channel (3) along a direction perpendicular to the extension direction of the roller axis.

4. The roller mill coarse material receiving and returning device according to claim 1, characterized in that: The coarse material return mechanism comprises one or more conveyor belts (7), and the conveyor belts (7) are arranged to correspond to the bottom end openings of the first coarse material outlet channel (2) and the second coarse material outlet channel (4).

5. The roller mill coarse material receiving and returning device according to claim 3, characterized in that: The coarse material return mechanism also includes a feeding device; the feeding device includes a feed hopper (8), a feeding mechanism (9) and a discharge port (10), the feed hopper (8) opening is directly opposite to the end of the transmission direction of the conveyor belt (7), one end of the feeding mechanism (9) is connected to the end of the feed hopper (8), and the other end of the feeding mechanism (9) is connected to the discharge port (10), and the discharge port (10) is directly opposite to the top of the grinding mechanism.

6. The roller mill coarse material receiving and returning device according to claim 5, characterized in that: The feeding equipment includes a bucket elevator or a screw conveyor.

7. The roller mill coarse material receiving and returning device according to claim 6, characterized in that: The conveyor belt (7) is provided with a coarse material collection channel with two ends extending therethrough at the end thereof along the transmission direction. A bracket (12) is provided below the conveyor belt (7). The coarse material collection channel is fixed to the side of the bracket (12). The coarse material collection channel is a funnel structure with a top cross-sectional area larger than a bottom cross-sectional area, and includes a collection port (13) and a transport port (14). The collection port (13) faces the end of the conveyor belt (7), and the transport port (14) faces the feed hopper (8).

8. The roller mill coarse material receiving and returning device according to claim 3, characterized in that: An annular clamping portion is provided on the inner edge of the bottom of the fine material channel (3), and a screen adapted to the fine material channel (3) is clamped on the clamping portion.

9. The roller mill coarse material receiving and returning device according to claim 5, characterized in that: The first coarse material discharge channel (2) is an inverted Y-shaped structure, comprising a first discharge channel (201) and a second discharge channel, wherein the material outlet of the first discharge channel (201) and the material outlet of the second discharge channel are distributed on both sides of the fine material channel (3); meanwhile, the second coarse material discharge channel (4) is an inverted Y-shaped structure, comprising a third discharge channel (401) and a fourth discharge channel (402), wherein the third discharge channel (401) and the fourth discharge channel (402) are distributed on both sides of the fine material channel (3); the conveyor belt ( 7) includes a first belt (701) and a second belt (702), the first discharge channel (201) and the third discharge channel (401) are oriented toward the first belt (701), and the second discharge channel and the fourth discharge channel (402) are oriented toward the second belt (702); the feeding device includes a first feeding device and a second feeding device, the end of the first belt (701) along the material conveying direction is oriented toward the first feeding device, and the end of the second belt (702) along the material conveying direction is oriented toward the second feeding device.

10. The roller mill coarse material receiving and returning device according to claim 1, characterized in that: Vibrating motors are provided on the outer walls of the first coarse material outlet channel (2) and the second coarse material outlet channel (4).

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