Novel ring roller mill device

Abstract

The invention discloses a novel ring roller mill device. The novel ring roller mill device comprises a mill shell, the grinding roller mechanism is arranged in the grinding machine shell, and the grinding roller mechanism comprises a feeding end and a discharging end; the driving mechanism is in transmission connection with the grinding roller mechanism so as to drive the grinding roller mechanism to grind the raw materials; the flow limiting cover covers the feeding end; one end of the feeding pipe penetrates through the mill shell and the flow limiting cover and extends to the feeding end; the flow limiting cover is arranged at the feeding end of the grinding roller mechanism, the feeding end is covered, the feeding pipe directly extends into the flow limiting cover, raw materials are conveyed to the feeding end, and due to the isolation effect of the flow limiting cover, discharging gas powder flowing upwards does not affect the situation that raw material powder enters the feeding end, and normal operation of secondary superfine grinding of the powder is guaranteed; and the feeding amount and speed of the powder raw materials are controlled, so that the maintenance degree of a material layer in the grinding roller mechanism can be adjusted, and the economical efficiency of the grinding process and the reasonable durability of equipment are adjusted and controlled.

Description

Technical Field

[0001] The present invention belongs to the technical field of material pulverization, and specifically relates to a novel ring roller mill device. Background Art

[0002] Phosphogypsum, as an industrial by-product, was originally regarded as waste. However, through calcination and ultrafine grinding, phosphogypsum can be transformed into high-value resources. High-quality phosphogypsum powder is in an advantageous position in terms of price, application fields, and market status, thus increasing the economic value of phosphogypsum.

[0003] After calcination, phosphogypsum is in the form of powder with a particle size of about 100-200 mesh. There are very few existing grinding equipment that use powder raw materials as feed for secondary ultrafine grinding. Generally, jet mills are selected, but jet mills have poor economy and high operating costs, and are not suitable for products with a low unit price such as phosphogypsum. Ring roller mills have low production costs and good economy, but existing ring roller mills cannot use powder as raw material feed for secondary ultrafine grinding.

[0004] A related document discloses a ring roller mill, which includes a cylinder body, a classification mechanism, a grinding roller mechanism, and a driving mechanism; the classification mechanism includes a classification motor and a classification wheel. The classification motor is arranged above the top cover of the cylinder body. An outlet is opened on the top cover of the cylinder body. The power output shaft of the classification motor passes through the outlet and is connected to the classification wheel; the grinding roller mechanism includes a grinding wheel assembly and a rotating main shaft. The grinding wheel assembly includes a grinding wheel bracket and at least two grinding wheels. The grinding wheel bracket is sleeved on the side wall of the rotating main shaft. A receiving groove is opened on the outer circumferential side wall of the grinding wheel bracket. The grinding wheel is pivotally installed in the receiving groove through an independent pin shaft; the driving mechanism is used to drive the rotating main shaft of the grinding roller mechanism to rotate.

[0005] When this kind of ring roller mill uses powder as raw material feed for secondary ultrafine grinding, the air flow in the ring roller mill will disturb the powder raw material, making it difficult for the powder raw material to enter the grinding roller mechanism for grinding. Summary of the Invention

[0006] The purpose of the present invention is to provide a novel ring roller mill device to solve at least one of the above technical problems.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: A novel ring roller mill device, comprising: A mill housing; by providing a mill housing for installing a grinding roller mechanism and providing a space for grinding, and cooperating with a negative pressure device, a negative pressure can be formed in the mill housing to suck out the raw materials that have completed grinding from the mill housing; A grinding roller mechanism, arranged in the mill housing, the grinding roller mechanism includes a feed end and a discharge end; by providing a grinding roller mechanism for grinding raw materials, the raw materials enter from the feed end and come out from the discharge end after being ground; A driving mechanism, which is in transmission connection with the roller mechanism to drive the roller mechanism to grind raw materials; A flow-limiting cover, covering the feeding end; A feed pipe, one end of which penetrates through the mill housing and the flow-limiting cover and extends to the feeding end. By providing the feed pipe, it is used to convey raw materials to the feeding end of the roller mechanism, and the raw materials conveyed to the feeding end are ground by the roller mechanism.

[0008] In the present invention, by providing a flow-limiting cover at the feeding end of the roller mechanism to cover the feeding end, the feed pipe directly extends into the flow-limiting cover to convey raw materials to the feeding end. Due to the isolation effect of the flow-limiting cover, the upward moving discharged air-powder flow does not affect the entry of raw material powder into the feeding end, ensuring the normal progress of the secondary ultrafine grinding of the powder; controlling the feeding amount and speed of the powder raw materials can adjust the saturation of the material layer in the roller mechanism, thereby regulating the economy of the grinding process and the reasonable durability of the equipment.

[0009] Specifically, the roller mechanism includes a grinding ring and a plurality of grinding rollers installed in the grinding ring. A grinding space is formed between the grinding rollers and the grinding ring. The top end of the grinding space is the feeding end, and the bottom end is the discharging end. The driving mechanism is in transmission connection with the grinding rollers. After the powder raw materials fall into the grinding space, they are squeezed and crushed by the grinding rollers and the grinding ring, and are ground into finer powders and then fall out from the bottom of the grinding space. The provided grinding ring and grinding rollers are used to squeeze and crush raw materials, so as to achieve the purpose of grinding raw materials.

[0010] Specifically, the driving mechanism includes a driving motor, and the driving motor is in transmission connection with the roller mechanism. The provided driving motor is used to drive the roller mechanism to grind materials.

[0011] Furthermore, it further includes a base, and the mill housing and the driving mechanism are respectively installed on both sides of the top surface of the base. The base is provided for installing the driving mechanism and the mill housing.

[0012] Further, it also includes a classification mechanism and an inner barrel. The bottom end of the inner barrel is coaxially and hermetically connected to the grinding ring. The classification mechanism is arranged at the top of the inner barrel. A number of through holes are provided on the side wall of the inner barrel. The through holes are located between the grinding roller mechanism and the classification mechanism. The bottom end of the flow limiting cover is located below the through holes. The classification mechanism is connected to a negative pressure device so that materials are sucked into the classification mechanism from the discharge end. The provided classification mechanism is used for classifying the particle sizes of the materials after pulverization. Materials with qualified particle sizes can be discharged, and those with too large particle sizes are left by the classification mechanism for continued grinding. The powder discharged from the discharge end forms a discharged air-powder material flow under the action of negative pressure. The provided inner barrel is used to optimize the flow path of the discharged air-powder material flow in the mill housing, and the flow path of the discharged air-powder material flow is separated from the powder raw material and the larger particle powder left by the classification mechanism as much as possible to reduce the interference of the discharged air-powder material flow on the raw material powder and the larger particle powder left by the classification mechanism. The through holes are provided for the discharged air-powder material flow to flow from outside the inner barrel into the inner barrel. The powder at the discharge end forms a discharged air-powder material flow under the action of negative pressure and mixes with air. The discharged air-powder material flow flows upward from the discharge end, first passes through the gap between the grinding ring and the mill housing, then comes to the gap between the inner barrel and the mill housing, and then passes through the through holes provided on the inner barrel and enters the inner barrel, and then continues to flow upward and enters the classification mechanism for classification. The powder with qualified particle sizes is extracted from the discharge port, and those unqualified are thrown out and fall into the feeding end for re-grinding. Since the discharged air-powder material flow enters the inner barrel through the through holes and enters the classification mechanism, the discharged air-powder material flow is divided into multiple strands in the inner barrel. The particles thrown out by the classification mechanism can only pass through the area between the multiple strands of discharged air-powder material flow and fall into the feeding end, that is, the particles thrown out by the classification mechanism can only fall into the feeding end from the area between adjacent two through holes. The flow limiting cover is located inside the inner barrel and below the through holes. After the discharged air-powder material flow enters the inner barrel through the through holes, it directly flows upward without interfering with the powder raw material entering the feeding end. The larger particle powder thrown out by the classification mechanism passes through the gap between the inner barrel and the flow limiting cover and enters the feeding end.

[0013] Further, the classification mechanism includes a classification motor and a classification wheel. An outlet is provided on the top surface of the mill housing. The classification wheel is installed inside the outlet. The classification motor is in transmission connection with the classification wheel. The provided classification motor is used to drive the classification wheel to rotate. The provided classification wheel is used for screening the particle sizes of the powder. After the particles enter the classification wheel, those with large particle sizes are thrown out of the classification wheel and fall into the feeding end for re-grinding, and those with small particle sizes are not large enough to be thrown out of the classification wheel and are extracted from the outlet under the action of negative pressure.

[0014] Furthermore, the classification motor is coaxially installed above the classification wheel. The transmission shaft of the classification motor passes through the discharge port and is connected to the classification wheel. The classification motor is directly connected to the classification wheel in a simple connection manner. Moreover, the classification motor is installed above the classification wheel, saving lateral space.

[0015] Furthermore, the discharge port is communicated with a discharge elbow, which is convenient for the discharged powder of the ground material.

[0016] Furthermore, a plurality of air inlets are provided on the mill housing. The air inlets are located below the discharge end. After the air outside the mill housing enters the mill housing through the air inlets, it is discharged from the discharge port. The air inlets are arranged below the discharge end, and the discharge port is located above the discharge end, which is convenient for the air entering the mill housing from the outside to be mixed with the ground powder to form a discharged air-powder material flow.

[0017] Furthermore, a classification channel is provided between the inner barrel and the current-limiting cover for the larger particle powder thrown out by the classification wheel to pass through and enter the feeding end for re-grinding.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By providing a current-limiting cover at the feeding end of the grinding roller mechanism, the feeding end is covered, and the feeding pipe directly extends into the current-limiting cover to convey the raw material to the feeding end. Due to the isolation effect of the current-limiting cover, the upward discharged air-powder material flow does not affect the entry of the raw material powder into the feeding end, ensuring the normal progress of the secondary ultrafine grinding of the powder; controlling the feeding amount and speed of the powder raw material can adjust the saturation of the material layer in the grinding roller mechanism, thereby regulating the economy of the grinding process and the reasonable durability of the equipment.

[0019] 2. The grading mechanism provided in the present invention is used for grading the particle sizes of the materials after pulverization. The inner barrel provided is used to optimize the flow path of the discharged gas-powder stream inside the mill housing, and the flow path of the discharged gas-powder stream is spaced as much as possible from the powder raw materials and the larger-particle powder left by the grading mechanism, so as to reduce the interference of the discharged gas-powder stream on the raw material powder and the larger-particle powder left by the grading mechanism. The through holes are opened to allow the discharged gas-powder stream to flow from outside the inner barrel to inside the inner barrel; under the action of negative pressure, the powder at the discharge end is mixed with air to form a discharged gas-powder stream. The discharged gas-powder stream flows upward from the discharge end, first passes through the space between the grinding ring and the mill housing, comes to the space between the inner barrel and the mill housing, then passes through the through holes opened on the inner barrel, enters the inner barrel, and then continues to flow upward, enters the grading mechanism for grading. The powder particles that meet the size requirements are drawn out from the discharge port, and those that do not meet the requirements are thrown out and fall into the feeding end to be ground again. Since the discharged gas-powder stream enters the inner barrel from the through holes and enters the grading mechanism, the discharged gas-powder stream is divided into multiple strands inside the inner barrel. The particles thrown out by the grading mechanism can only pass through the area between the multiple discharged gas-powder streams and fall into the feeding end, that is, the particles thrown out by the grading mechanism can only fall into the feeding end from the area between two adjacent through holes; the flow-limiting cover is located inside the inner barrel and below the through holes. After the discharged gas-powder stream enters the inner barrel from the through holes, it directly flows upward without interfering with the powder raw materials entering the feeding end. The larger-particle powder thrown out by the grading mechanism passes through the gap between the inner barrel and the flow-limiting cover and enters the feeding end. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a novel ring-roll mill device in this embodiment; Figure 2 is a cross-sectional view of a novel ring-roll mill device in this embodiment; Figure 3 is a schematic structural diagram of a novel ring-roll mill device without the mill housing in this embodiment; In the figure: 1. Mill housing; 101. Air inlet; 2. Grinding roll mechanism; 201. Grinding ring; 202. Grinding roll; 203. Grinding roll support; 3. Driving mechanism; 301. Driving motor; 302. Belt; 4. Flow-limiting cover; 5. Feed pipe; 6. Base; 7. Grading mechanism; 701. Grading motor; 702. Grading wheel; 703. Discharge elbow; 8. Inner barrel; 801. Through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0022] As Figures 1-3 shown, this embodiment provides a new type of ring-roller mill device, including: a mill housing 1, a roller mechanism 2, a driving mechanism 3, a flow-limiting cover 4, and a feed pipe 5.

[0023] By providing the mill housing 1 for installing the roller mechanism 2 and providing a space for grinding, and cooperating with a negative pressure device, a negative pressure can be formed in the mill housing 1 to suck out the raw materials that have completed grinding from the mill housing 1; In this embodiment, the mill housing 1 can be integrally cylindrical, and the side wall of the mill housing 1 corresponding to the roller mechanism 2 can be strengthened, for example, by using a thicker side wall.

[0024] The roller mechanism 2 is arranged inside the mill housing 1. The roller mechanism 2 includes a feed end and a discharge end; by providing the roller mechanism 2 for grinding raw materials, the raw materials enter from the feed end and come out from the discharge end after being ground; specifically, the roller mechanism 2 includes a grinding ring 201 and a number of grinding rollers 202 installed inside the grinding ring 201. A grinding space is formed between the grinding rollers 202 and the grinding ring 201. The top of the grinding space is the feed end, and the bottom is the discharge end. The driving mechanism 3 is in transmission connection with the grinding rollers 202. After the powder raw materials fall into the grinding space, they are squeezed and crushed by the grinding rollers 202 and the grinding ring 201, and are ground into finer powders and then fall out from the bottom of the grinding space. By providing the grinding ring 201 and the grinding rollers 202 for squeezing and crushing the raw materials, the purpose of grinding the raw materials is achieved.

[0025] In this embodiment, a number of grinding rollers 202 can be divided into multiple layers and installed on the grinding roller 202 support from top to bottom in sequence. The grinding rollers 202 of each layer can be evenly distributed in a ring shape. Grinding grooves can be opened at the corresponding positions of the inner wall of the grinding ring 201 and each layer of grinding rollers 202. The powder raw materials are ground by the grinding rollers 202 in the grinding grooves; from top to bottom, the distance between each layer of grinding rollers 202 and the grinding grooves can gradually become smaller, and the powder raw materials are ground by multiple layers of grinding rollers 202 in sequence from top to bottom and gradually become smaller; the grinding roller 202 support, the grinding ring 201, and the mill housing 1 can be coaxially arranged.

[0026] The driving mechanism 3 is in transmission connection with the roller mechanism 2 to drive the roller mechanism 2 to grind raw materials; specifically, the driving mechanism 3 includes a driving motor 301, and the driving motor 301 is in transmission connection with the roller mechanism 2. By providing the driving motor 301, it is used to drive the roller mechanism 2 to grind materials.

[0027] In this embodiment, the driving motor 301 can be drivingly connected to the bracket of the grinding roller 202 through a belt 302. The driving motor 301 drives the bracket of the grinding roller 202, and then the bracket of the grinding roller 202 drives the grinding roller 202 to rotate to grind the powder raw material. When the bracket of the grinding roller 202 rotates on its own axis, it can drive the grinding roller 202 to rotate around the bracket of the grinding roller 202. The bracket of the grinding roller 202 can also drive the grinding roller 202 to rotate on its own axis, improving the grinding efficiency. The reason why the bracket of the grinding roller 202 drives the grinding roller 202 to rotate on its own axis may be the frictional force between the grinding roller 202 and the grinding ring 201 when the grinding roller 202 revolves around the bracket of the grinding roller 202, which causes the grinding roller 202 to rotate on its own axis.

[0028] The current-limiting cover 4 covers the feeding end. In this embodiment, the current-limiting cover 4 is located above the grinding roller 202. The current-limiting cover 4 does not contact the grinding roller 202 and does not hinder the powder raw material from entering the grinding space between the grinding roller 202 and the grinding ring 201, that is, the current-limiting cover 4 does not hinder the powder raw material from entering the grinding groove.

[0029] In this embodiment, the outer shape of the current-limiting cover 4 can be frustum-shaped or hemispherical.

[0030] The feeding pipe 5 has one end passing through the mill housing 1 and the current-limiting cover 4 and extending to the feeding end. By providing the feeding pipe 5, it is used to convey the raw material to the feeding end of the grinding roller mechanism 2, and the raw material conveyed to the feeding end is ground by the grinding roller mechanism 2.

[0031] In the present invention, by providing the current-limiting cover 4 at the feeding end of the grinding roller mechanism 2 to cover the feeding end, the feeding pipe 5 directly extends into the current-limiting cover 4 to convey the raw material to the feeding end. Due to the isolation effect of the current-limiting cover 4, the upward flowing discharged air-powder stream does not affect the entry of the raw material powder into the feeding end, ensuring the normal progress of the secondary ultra-fine grinding of the powder; controlling the feeding amount and speed of the powder raw material can adjust the saturation degree of the material layer in the grinding roller mechanism 2, thereby regulating the economy of the grinding process and the reasonable durability of the equipment.

[0032] Further, it further includes a base 6. The mill housing 1 and the driving mechanism 3 are respectively installed on both sides of the top surface of the base 6. By providing the base 6, it is used to install the driving mechanism 3 and the mill housing 1.

[0033] In this embodiment, a cavity can be formed in the base 6. The motor shaft of the driving motor 301 and the rotating shaft of the bracket of the grinding roller 202 can both extend into the cavity in the base 6, and then the motor shaft of the driving motor 301 and the rotating shaft of the bracket of the grinding roller 202 are drivingly connected through the belt 302.

[0034] Further, it further includes a classification mechanism 7 and an inner barrel 8. The bottom end of the inner barrel 8 is coaxially and hermetically connected to the grinding ring 201. The classification mechanism 7 is arranged at the top of the inner barrel 8. A number of through holes 801 are formed in the side wall of the inner barrel 8. The through holes 801 are located between the grinding roller mechanism 2 and the classification mechanism 7. The bottom end of the flow limiting cover 4 is located below the through holes 801. The classification mechanism 7 is communicated with a negative pressure device so that the material is sucked into the classification mechanism 7 from the discharge end. The provided classification mechanism 7 is used for classifying the particle sizes of the material after pulverization. The particles with qualified particle sizes can be discharged, and the particles that are too large are left by the classification mechanism 7 and continue to be ground; the powder discharged from the discharge end is mixed with air under the action of negative pressure to form a discharge air-powder material flow. The provided inner barrel 8 is used to optimize the flow path of the discharge air-powder material flow in the mill housing 1, and separate the flow path of the discharge air-powder material flow from the powder raw material and the larger particle powder left by the classification mechanism 7 as much as possible, so as to reduce the interference of the discharge air-powder material flow on the raw material powder and the larger particle powder left by the classification mechanism 7. The through holes 801 are provided for the discharge air-powder material flow to flow from outside the inner barrel 8 into the inner barrel 8; the powder at the discharge end is mixed with air under the action of negative pressure to form a discharge air-powder material flow. The discharge air-powder material flow flows upward from the discharge end, first passes through between the grinding ring 201 and the mill housing 1, comes to between the inner barrel 8 and the mill housing 1, then passes through the through holes 801 formed in the inner barrel 8, enters the inner barrel 8, and then continues to flow upward and enters the classification mechanism 7 for classification. The powder particles with qualified sizes are extracted from the discharge port, and the unqualified ones are thrown out and fall into the feeding end and are ground again. Because the discharge air-powder material flow enters the inner barrel 8 from the through holes 801 and enters the classification mechanism 7, the discharge air-powder material flow is divided into multiple strands in the inner barrel 8. The particles thrown out by the classification mechanism 7 can only pass through between the multiple strands of discharge air-powder material flow and fall into the feeding end, that is, the particles thrown out by the classification mechanism 7 can only fall into the feeding end from the area between two adjacent through holes 801; the flow limiting cover 4 is located in the inner barrel 8 and below the through holes 801. After the discharge air-powder material flow enters the inner barrel 8 from the through holes 801, it directly flows upward and will not interfere with the powder raw material entering the feeding end. The larger particle powder thrown out by the classification mechanism 7 passes through the gap between the inner barrel 8 and the flow limiting cover 4 and enters the feeding end.

[0035] In this embodiment, the top end and the bottom end of the inner barrel 8 can both be open. The bottom end of the inner barrel 8 can be hermetically connected to the top surface of the grinding ring 201 to separate the discharge air-powder material flow from the feeding end. The top end of the inner barrel 8 can also be hermetically connected to the inner top surface of the mill housing 1 so that the discharge air-powder material flow can only flow into the classification mechanism 7 through the through holes 801, avoiding the discharge air-powder material flow flowing into the classification mechanism 7 from the gap between the top end of the inner barrel 8 and the mill housing 1, and can improve the speed of the discharge air-powder material flow entering the classification mechanism 7.

[0036] In this embodiment, a number of through holes 801 are all at the same height and are evenly distributed on the side wall of the inner barrel 8.

[0037] In this embodiment, a plurality of through holes 801 can be arranged at intervals so that the discharge gas and powder flow is divided into multiple streams after entering the inner barrel 8, so that the larger particles of powder left by the grading mechanism 7 can fall into the material end through the gaps between the multiple discharge gas and powder flows.

[0038] In this embodiment, the feed pipe 5 passes through the inner barrel 8 .

[0039] Furthermore, the grading mechanism 7 includes a grading motor 701 and a grading wheel 702. A discharge port is provided on the top surface of the mill housing 1. The grading wheel 702 is installed on the inner side of the discharge port. The grading motor 701 is transmission-connected to the grading wheel 702. The grading motor 701 is used to drive the grading wheel 702 to rotate. The grading wheel 702 is used to screen the powder particles according to their size. After entering the grading wheel 702, the large particles are thrown out of the grading wheel 702 and fall to the feed end to be ground again. The small particles are not enough to be thrown out of the grading wheel 702 and are drawn out from the discharge port under the action of negative pressure.

[0040] Furthermore, the grading motor 701 is coaxially installed above the grading wheel 702, and the transmission shaft of the grading motor 701 passes through the discharge port and is connected to the grading wheel 702. The grading motor 701 is directly connected to the grading wheel 702 in a transmission manner. The connection method is simple, and the grading motor 701 is installed above the grading wheel 702, saving horizontal space.

[0041] Furthermore, the discharge port is connected to a discharge elbow 703 to facilitate the discharge of the ground powder.

[0042] In this embodiment, the negative pressure device can be connected to the end of the discharge elbow 703 away from the discharge port to facilitate the extraction of the ground powder from the discharge end. In this embodiment, the negative pressure device can be a negative pressure fan or a negative pressure pump.

[0043] In this embodiment, a device for separating powder and air may be provided between the discharge elbow 703 and the negative pressure device. For example, a filter bag or a cyclone separator may be provided between the discharge elbow 703 and the negative pressure device.

[0044] Furthermore, a plurality of air inlets 101 are provided on the mill shell 1, and the air inlets 101 are located below the discharge end. The air outside the mill shell 1 enters the mill shell 1 from the air inlets 101 and is discharged from the discharge port. The air inlets 101 are arranged below the discharge end, and the discharge port is located above the discharge end, so that the air from the outside entering the mill shell 1 is mixed with the ground powder to form a discharge gas-powder flow.

[0045] In this embodiment, the plurality of air inlets 101 are located at the same height and are evenly distributed along the circumference of the mill housing 1 .

[0046] Furthermore, a grading channel is provided between the inner barrel 8 and the flow-limiting cover 4 for the larger particle powder ejected by the grading wheel 702 to pass through and enter the feeding end for re-grinding.

[0047] Working principle: The powder raw material directly falls above the grinding roller 202 from the feeding pipe 5, enters the feeding end under the protection of the flow-limiting cover 4, is squeezed and ground by the grinding roller 202 and the grinding ring 201, and finally falls from the discharging end after being ground by multiple layers of grinding rollers 202. The ground powder is driven by the air entering from the air inlet 101 into the grinding machine housing 1 to form a discharging air-powder flow. The discharging air-powder flow flows upward, first passes between the grinding ring 201 and the grinding machine housing 1, and then flows upward between the inner barrel 8 and the grinding machine housing 1. When it flows to the through hole 801, it enters the inner barrel 8 from the through hole 801. The discharging air-powder flow is divided into multiple strands in the inner barrel 8 and continues to move towards the grading wheel 702 until it enters the grading wheel 702. After being graded by the grading wheel 702, the powder with a particle size meeting the requirements enters the discharging elbow 703 from the top of the grading wheel 702 and is discharged from the discharging elbow 703. The powder with a particle size not meeting the requirements is ejected from the grading wheel 702 and falls into the feeding end for continuous grinding.

[0048] It should be noted that although the present invention is disclosed as above with specific embodiments, the above embodiments are not intended to limit the present invention. Those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is subject to the scope defined by the claims.

Claims

1. A new type of ring-roller mill device, characterized in that, Comprising: A mill housing; A roller mechanism disposed within the mill housing, the roller mechanism including a feed end and a discharge end; A driving mechanism drivingly connected to the roller mechanism to drive the roller mechanism to grind raw materials; A flow-limiting cover covering the feed end; A feed pipe, one end of which penetrates through the mill housing and the flow-limiting cover and extends to the feed end.

2. The novel ring-roller mill device according to claim 1, characterized in that, The roller mechanism includes a grinding ring and a plurality of rollers installed within the grinding ring. A grinding space is formed between the rollers and the grinding ring. The top end of the grinding space is the feed end, and the bottom end is the discharge end. The driving mechanism is drivingly connected to the rollers.

3. The novel ring-roller mill device according to claim 1, wherein, The driving mechanism includes a driving motor, and the driving motor is drivingly connected to the roller mechanism.

4. The novel ring roller mill device according to claim 1, characterized in that, It further includes a base, and the mill housing and the driving mechanism are respectively installed on both sides of the top surface of the base.

5. The novel ring roll mill device according to claim 2, wherein, It further includes a classification mechanism and an inner barrel. The bottom end of the inner barrel is coaxially and sealingly connected to the grinding ring. The classification mechanism is disposed at the top of the inner barrel. A plurality of through holes are formed in the side wall of the inner barrel. The through holes are located between the roller mechanism and the classification mechanism. The bottom end of the flow-limiting cover is located below the through holes. The classification mechanism is communicated with a negative pressure device to suck materials from the discharge end into the classification mechanism.

6. The novel ring roll mill device according to claim 5, characterized in that, The classification mechanism includes a classification motor and a classification wheel. An outlet is formed in the top surface of the mill housing. The classification wheel is installed inside the outlet. The classification motor is drivingly connected to the classification wheel.

7. The novel ring roller mill device according to claim 6, characterized in that, The classification motor is coaxially installed above the classification wheel, and the transmission shaft of the classification motor passes through the outlet and is connected to the classification wheel.

8. The novel ring-roller mill device according to claim 7, wherein The outlet is communicated with a discharge elbow.

9. The novel ring-roller mill device according to claim 5, wherein, A plurality of air inlets are formed in the mill housing, and the air inlets are located below the discharge end.

10. The novel ring-roller mill device according to claim 5, wherein, A classification channel is provided between the inner barrel and the flow-limiting cover.

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