A cantilevered drying bin for a dry ball mill

Abstract

This invention relates to the field of dry ball mill technology and discloses a cantilevered drying chamber for a dry ball mill, comprising two chambers and a discharge end. The two chambers are a grinding chamber and a drying chamber, respectively. One end of the grinding chamber is connected to the drying chamber, and the other end of the grinding chamber is connected to the discharge end. A track is provided on the outer circumference of the grinding chamber. The lining plate inside the drying chamber is used to protect the inner wall of the cylinder and reduce direct wear of the material. Several lifting plates are installed on the lining plate. The number of lifting plates can be adaptively adjusted according to the moisture content of the material and the output requirements, and they are arranged in multiple rows at intervals along the axial direction of the drying chamber. During the rotation of the drying chamber, the lifting plates repeatedly lift the material, changing the material from an accumulated state to a dispersed state, thereby increasing the contact area between the material and the hot air and improving the heat exchange effect.

Description

Technical Field

[0001] This invention relates to the field of dry ball mill technology, and particularly to a cantilever drying chamber for a dry ball mill. Background Technology

[0002] Traditional dry ball mills can only process low-moisture materials with a moisture content of <3%. However, in mining, building materials, and metallurgy, there are many high-moisture raw materials (moisture content ≥5%), such as iron concentrate, slag, and coal powder. If these high-moisture raw materials are directly fed into the mill, problems such as sticking to the hopper, ball clogging, and grate blockage will occur, severely affecting grinding efficiency. The traditional production process involves a drying kiln and a dry ball mill. The drying kiln dries the material from ≥5% to <3% moisture content, and then the material is ground in the dry ball mill to the required fineness. The original production process requires two sets of core equipment: a drying kiln and a dry ball mill. This process is complex, has high initial investment costs, requires a large area, and has high investment and operating costs.

[0003] Existing dry ball mills integrate drying and grinding. The drying chamber and grinding chamber are located within the same cylinder, separated by a partition device. In the drying chamber, hot air exchanges heat with the material to remove moisture. After drying, the material enters the grinding chamber through the partition device, where it is ground to the desired fineness under the impact and grinding action of the grinding media. Both ends of the cylinder are supported by sliding bearings or main bearings. To ensure drying efficiency, the air temperature is generally >200℃. The hot air must first pass through the bearing support section at one end of the cylinder before entering the drying chamber inside the mill. As the hot air passes through the bearing support section, heat is inevitably transferred to the bearings, which can easily lead to increased bearing temperature and lubricating oil temperature. Excessive bearing temperature can cause the mill to stop. Increased lubricating oil temperature affects the kinematic viscosity of the lubricating oil, reducing the oil film thickness between the cylinder and the bearing, potentially preventing full hydraulic lubrication between the bearing and the cylinder.

[0004] Therefore, the above problems are solved by using a cantilever drying chamber for dry ball mills. Summary of the Invention

[0005] The purpose of this invention is to provide a cantilever drying chamber for a dry ball mill, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: comprising two chambers and a discharge end, wherein the two chambers are a grinding chamber and a drying chamber, one end of the grinding chamber is connected to the drying chamber, the other end of the grinding chamber is connected to the discharge end, and a track is provided on the outer circular surface of the grinding chamber.

[0007] Preferably, the drying chamber is installed at one end of the grinding chamber via a cantilever structure, and a discharge device is provided inside the drying chamber, which is located near one end of the grinding chamber.

[0008] Preferably, the drying chamber is provided with a liner plate arranged in a circle around the drying chamber, and a plurality of lifting plates are installed at one end of the liner plate.

[0009] Preferably, the lifting plate is inclinedly disposed on the end face of the liner plate.

[0010] Preferably, the discharge device includes a discharge plate, one end of which is connected to a guide plate, and the guide plate and the discharge plate are on the same straight line.

[0011] Preferably, the guide plate is provided with a plurality of discharge plates at one end near the discharge plate, and the discharge plates are installed on the guide plate in a circumferential distribution.

[0012] Preferably, a discharge cone is installed between the discharge plate and the guide plate.

[0013] Preferably, the guide plate is embedded at one end of the discharge plate.

[0014] Preferably, the discharge cone includes a mounting ring, which is mounted on the end face of the guide plate. A connecting plate is mounted on the end face of the mounting ring. The connecting plates are circumferentially distributed on the end faces of multiple mounting rings. A fixing ring is provided between the multiple connecting plates. A protective plate is mounted on the end face of the fixing ring. One side of the end face of the protective plate is connected to the connecting plate.

[0015] The technical effects and advantages of this invention are as follows: 1. The lining plate inside the drying chamber of this invention is used to protect the inner wall of the cylinder and reduce the direct wear of the material on it. Several lifting plates are installed on the lining plate. The number of lifting plates can be adjusted according to the moisture content of the material and the output requirements. They are arranged in multiple rows along the axial direction of the drying chamber. During the rotation of the drying chamber, the lifting plates repeatedly lift the material, so that the material changes from a piled state to a dispersed state, thereby increasing the contact area between the material and the hot air and improving the heat exchange effect.

[0016] 2. In this invention, the material enters from the drying chamber, and after being dried in the drying chamber, it enters the grinding chamber for grinding. The hot air generated during the drying process is cooled to below 90°C after heat exchange before entering the grinding chamber. This effectively reduces the temperature of the hot air and reduces the risk of heat transfer to the bearing parts outside the grinding chamber. Since the drying chamber adopts a cantilever structure, it further blocks the heat conduction path between the high-temperature area and the bearing seat, thereby avoiding the adverse effects of high temperature on the bearing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the drying chamber structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the rear structure of the drying chamber of the present invention.

[0021] Figure 5 This is a schematic diagram of the lifting plate structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the liner structure of the present invention.

[0023] Figure 7 This is a schematic diagram of the distribution structure of the lifting plates on the end face of the liner plate according to the present invention.

[0024] Figure 8 This is a schematic diagram of the material discharge device of the present invention.

[0025] Figure 9 This is a schematic diagram of the discharge plate structure of the present invention.

[0026] Figure 10 This is a schematic diagram of the material guide plate structure of the present invention.

[0027] Figure 11 This is a schematic diagram of the discharge cone structure of the present invention.

[0028] Figure 12 This is a schematic diagram of the connection structure between the mounting ring and the connecting plate of the present invention.

[0029] Figure 13 This is a schematic diagram of the protective plate installation structure of the present invention.

[0030] Figure 14 This is a schematic diagram of the discharging device of the present invention.

[0031] Figure 15 This is a schematic diagram of the ventilation frame structure of the present invention.

[0032] In the diagram: 1. Grinding chamber; 2. Track; 3. Drying chamber; 301. Liner; 302. Lifting plate; 303. Manhole; 4. Discharge end; 5. Feed end; 6. Discharge device; 601. Discharge plate; 602. Guide plate; 603. Discharge plate; 604. Discharge cone; 6041. Mounting ring; 6042. Connecting plate; 6043. Fixing ring; 6044. Guard plate; 7. Ventilation frame. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] This invention provides, for example Figures 1 to 15 The cantilever drying chamber shown is for a dry ball mill and includes a grinding chamber 1, a drying chamber 3 and a discharge end 4. The grinding chamber 1 is arranged in a horizontal direction and a track 2 is fixed on its outer circular surface for cooperation with an external drive device. One end of the grinding chamber 1 is connected to the drying chamber 3 and the other end is connected to the discharge end 4.

[0035] The drying chamber 3 is connected to the grinding chamber 1 using a cantilever structure. Specifically, the drying chamber 3 is provided with a flange at one end near the grinding chamber 1. This flange is matched with the web plate stop fixed at the end of the grinding chamber 1 and is fixedly connected by bolts, thus forming a cantilever structure with one end rigidly connected and the other end suspended. The drying chamber 3 is not directly connected to external support devices or bearing seats.

[0036] The external drive device can adopt the drive form commonly used in rotary equipment. In specific implementation, the motor drives the drive shaft to rotate through gear transmission. A drive wheel is installed on the drive shaft. The drive wheel cooperates with the track 2, thereby driving the grinding chamber 1 to rotate around its axis. At the same time as the grinding chamber 1 rotates, the drying chamber 3 connected to it rotates synchronously.

[0037] During operation, the material enters through the drying chamber 3, and after being dried in the drying chamber 3, it enters the grinding chamber 1 for grinding. The hot air generated during the drying process is cooled to below 90°C after heat exchange before entering the grinding chamber 1. This effectively reduces the temperature of the hot air and reduces the risk of heat transfer to the bearing parts outside the grinding chamber 1. Since the drying chamber 3 adopts a cantilever structure, it further blocks the heat conduction path between the high-temperature area and the bearing seat, thereby avoiding the adverse effects of high temperature on the bearing.

[0038] After the grinding operation is completed, the external drive device reverses, and the grinding chamber 1 rotates in the opposite direction. The material is discharged from the discharge end 4 under the action of gravity and internal structure, thus completing the entire drying and grinding process.

[0039] The equipment is a rotary mixer. The mixer base is driven by a motor, which drives the transmission shaft to rotate via gears. The transmission shaft is equipped with a transmission wheel. When the transmission wheel rotates, it drives the grinding chamber 1 to rotate. When the motor rotates forward, the grinding chamber 1 rotates forward, and the material will not be discharged through the discharge end 4. When the motor rotates in reverse, it drives the grinding chamber 1 to rotate in reverse, and the material is discharged through the discharge end 4. The external device is similar to that of a mixer. The mixer is existing technology and will not be described in detail here.

[0040] Furthermore, the drying chamber 3 is provided with a liner 301, which is arranged circumferentially along the inner wall of the drying chamber 3, and a plurality of lifting plates 302 are installed on the liner 301.

[0041] The drying chamber 3 is equipped with a feed end 5 at the end away from the grinding chamber 1. The feed end 5 adopts an end cap structure, and a transition chamber is fixed on the end cap. Before entering the drying chamber 3, the material falls into the transition chamber and slides into the drying chamber 3 naturally under the effect of accumulation. By setting the transition chamber, the long distance of material falling when it first enters the drying chamber 3 can be effectively avoided, and the material can be prevented from deviating from the drying area under the action of hot air flow field. This ensures that the effective length of the drying chamber 3 is fully utilized and improves the drying efficiency. The front end of the transition chamber is also equipped with a sealing device to prevent material and hot air from leaking out.

[0042] The lining plate 301 inside the drying chamber 3 is used to protect the inner wall of the cylinder and reduce the direct wear of the material on it. Several lifting plates 302 are installed on the lining plate 301. The number of lifting plates 302 can be adjusted according to the moisture content of the material and the output requirements, and they are arranged in multiple rows along the axial direction of the drying chamber 3.

[0043] During the rotation of the drying chamber 3, the lifting plate 302 repeatedly lifts the material, changing the material from a piled state to a dispersed state, thereby increasing the contact area between the material and the hot air and improving the heat exchange effect. A manhole door 303 is opened on the outer circular surface of the drying chamber 3, which facilitates the entry of workers into the drying chamber 3 to maintain the internal parts of the drying chamber 3.

[0044] In addition, the lifting plates 302 are inclined relative to the axis of the drying chamber 3. Multiple lifting plates 302 in the same row together form a spiral propulsion structure. The lifting plates 302 are arranged in multiple rows, and the multiple rows of lifting plates 302 are arranged circumferentially, covering the inside of the drying chamber 3. During the rotation of the drying chamber 3, the spiral propulsion structure can apply axial thrust to the material, so that the material gradually moves towards the grinding chamber 1, realizing continuous drying and conveying.

[0045] The lifting plate 302 consists of a base plate, a vertical plate, and two arc-shaped plates. Two mounting holes are opened on one side of the end face of the base plate, and one mounting hole is opened on the other side. Protective plates are installed on the side of the mounting holes. The protective plates are used to snap the bolt caps. The bolt caps are placed between the two protective plates. The bolt column extends out of the drying chamber 3 and the liner plate 301 and connects with the bolt cap. Then, the bolt column is rotated to connect with the bolt cap.

[0046] refer to Figure 7The three mounting holes are arranged in a triangle to facilitate adjustment of the tilt angle of the lifting plate 302. The tilt angle can also be adjusted according to different material moisture contents and rotation directions. The specific installation method of the lifting plate 302 is adjusted according to actual production needs. When two mounting holes are used for fixing on one side, only one is fixed; the other mounting hole is used for adjustment.

[0047] A vertical plate is installed at the top of the base plate end face, and the bottom of the vertical plate is fixedly connected to the base plate. The top of the vertical plate is curved, bending towards the base plate end face. (See reference) Figure 5 A through groove is opened in the middle of the curved top of the upright plate, which divides the curved top of the upright plate into two. The inside of the curved groove contacts the material, which facilitates the lifting of the material and also makes it easier for the material to slide down through the through groove. This improves the flowability of the material and makes the material dry more thoroughly.

[0048] The upright plate is equipped with curved plates on both sides. The bottom of the curved plates is connected to the bottom plate, forming a structure with the bottom plate, upright plate, and curved plate closed at three ends and open at one end. The three are connected to form a bucket shape, which facilitates the hoisting of materials and allows the materials to flow fully.

[0049] Furthermore, the discharge device 6 includes a discharge plate 601, one end of which is connected to a guide plate 602, and the guide plate 602 and the discharge plate 601 are located on the same straight line.

[0050] The drying chamber 3 is equipped with a discharge device 6 at the tail end, which pushes the material in the drying chamber 3 into the grinding chamber 1. The discharge device 6 consists of a discharge plate 601, a guide plate 602, a discharge cone 604 and a ventilation frame 7.

[0051] The discharge plate 601 is a fan-shaped plate structure. Several of them are grouped together to form a circular discharge plate 601 around the circumference. It is fixed to the cylinder of the drying chamber 3 with bolts. Each fan-shaped plate has a material passage hole to facilitate the passage of material. During rotation, the material is lifted by the lifting plate 302 or conveyed to the material passage hole by a row of lifting plates 302. The material enters the material passage hole. By controlling the perforation rate of the fan-shaped plate, the material throughput and the drying time of the material in the drying chamber 3 are controlled to ensure the maximum output of the mill.

[0052] The guide plate 602 is an arc-shaped steel plate welded onto a fan-shaped steel plate. The end face of the fan-shaped steel plate is welded with a discharge plate 603. Several of these plates are grouped together to form the entire circumference. The fan-shaped steel plate is fixed to the end face of the grinding chamber 1 by a spiral. The arc-shaped steel plate on the guide plate 602 can guide the material from the outer circumference to the central area, that is, the discharge cone 604. The discharge cone 604 is a welded part with a complete circular structure. By fixing it to the guide plate 602, the material guided by the guide plate 602 can be introduced into the grinding chamber through the discharge cone 604.

[0053] The discharge cone 604 has a hollow center, and a ventilation frame 7 is installed in the center of the discharge cone 604. The ventilation frame 7 is a welded part with a hollow structure, consisting of two pieces joined together to form a complete circle, ensuring ventilation in the center and preventing the material to be ground from entering the grinding chamber 1 and damaging the internal structure of the grinding chamber 1.

[0054] The density between the ventilation frames 7 is relatively low, preventing materials from entering the grinding chamber 1 through the gaps between the ventilation frames 7, thus ensuring the integrity of the internal components of the grinding chamber 1.

[0055] After drying in drying chamber 3, the material enters grinding chamber 1 through discharge device 6. Grinding takes place inside grinding chamber 1. After grinding is completed, the external drive device reverses, and grinding chamber 1 rotates in the opposite direction. The material is discharged from discharge end 4 under the action of gravity and internal structure, completing the entire drying and grinding process.

[0056] Specifically, the end face of the discharge plate 601 has multiple material passage holes. During rotation, the material is lifted by the lifting plate 302 or conveyed to the material passage holes by a row of lifting plates 302. After entering the material passage holes, the material comes to the space between the discharge plate 601 and the guide plate 602, and is then conveyed to the outer surface of the discharge cone 604 by the discharge plate 603 on the guide plate 602. Finally, the material is discharged into the grinding chamber 1 through the discharge cone 604.

[0057] The discharge cone 604 consists of a mounting ring 6041, a connecting plate 6042, a fixing ring 6043, and a protective plate 6044. The mounting ring 6041 is connected to the guide plate 602 and is used to fix the mounting ring 6041. Multiple connecting plates 6042 are fixed inside the mounting ring 6041, forming a cone. The smaller diameter opening of the cone formed by the connecting plates 6042 is closer to the grinding chamber 1, and the larger diameter opening is closer to the drying chamber 3. The fixing ring 6043 is installed inside the larger opening. To further secure the connecting plate 6042 and prevent it from shaking or falling off during use, a protective plate 6044 is installed between the fixing ring 6043 and the mounting ring 6041. The protective plate 6044 is also a cone, which fits into the cone shape with the multiple connecting plates 6042. The protective plate 6044 is installed inside the cone formed by the multiple connecting plates 6042 to prevent materials from entering the gaps between the connecting plates 6042. At the same time, a ventilation rack 7 is installed inside the small opening of the cone of the protective plate 6044 to facilitate the flow of drying air.

[0058] Materials can only pass through the outside of the guard plate 6044, that is, between the outer circular surface of the guard plate 6044 and the connecting plate 6042. When the material passes through the outer circular surface of the guard plate 6044, the material flow direction is from the larger diameter to the smaller diameter, which facilitates the rapid passage of the material.

[0059] Additionally, one end of the discharge plate 603 on the guide plate 602 is connected to one end of the connecting plate 6042, for reference. Figure 8 After the material passes through the material passage hole, the discharge plate 603 drives the material flow and guides the material to the connecting plate 6042. Then, when the material passes through the outer circular surface of the guard plate 6044, the material flow direction is from the larger diameter to the smaller diameter, which facilitates the rapid passage of the material.

[0060] Workflow The material enters the drying chamber 3 through the transition chamber. A hot air source is set up outside the drying chamber 3 to deliver hot air into the drying chamber 3. At the same time, a drying source is installed outside the drying chamber 3 to heat the inside of the drying chamber 3 for drying the material inside the drying chamber 3.

[0061] After the material enters the drying chamber 3, it is repeatedly lifted by the lifting plates 302, changing the material from a piled state to a dispersed state, thereby increasing the contact area between the material and the hot air and improving the heat exchange effect. After drying, the drying chamber 3 continues to rotate. The lifting plates 302 are inclined relative to the axis of the drying chamber 3. Multiple lifting plates 302 in the same row form a spiral propulsion structure. The lifting plates 302 are arranged in multiple rows, and the multiple rows of lifting plates 302 are arranged circumferentially, covering the inside of the drying chamber 3. During the rotation of the drying chamber 3, the spiral propulsion structure can apply axial thrust to the material, so that the material gradually moves towards the grinding chamber 1, realizing continuous drying and conveying.

[0062] The material is conveyed to the material passage hole of the discharge plate 601. After the material enters through the material passage hole, it comes to the space between the discharge plate 601 and the guide plate 602. It is then conveyed to the outer surface of the discharge cone 604 through the discharge plate 603 on the guide plate 602, and then discharged into the grinding chamber 1 through the discharge cone 604.

[0063] After entering the grinding chamber 1, the material is ground inside the grinding chamber 1. After grinding is completed, the grinding chamber 1 reverses, the external drive device reverses, and the grinding chamber 1 rotates in the opposite direction. The material is discharged from the discharge end 4 under the action of gravity and internal structure, thus completing the entire drying and grinding process.

[0064] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0065] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cantilever drying chamber for a dry ball mill, characterized in that: It includes two chambers and a discharge end (4). The two chambers are a grinding chamber (1) and a drying chamber (3). One end of the grinding chamber (1) is connected to the drying chamber (3), and the other end of the grinding chamber (1) is connected to the discharge end (4). A track (2) is provided on the outer circular surface of the grinding chamber (1). The drying chamber (3) is installed at one end of the grinding chamber (1) via a cantilever structure. A discharge device (6) is provided inside the drying chamber (3), and the discharge device (6) is located near one end of the grinding chamber (1).

2. The cantilever drying chamber for a dry ball mill according to claim 1, characterized in that: The drying chamber (3) is provided with a liner (301) inside. The liner (301) is arranged in a circle around the drying chamber (3). Multiple lifting plates (302) are installed at one end of the liner (301).

3. A cantilever drying chamber for a dry ball mill according to claim 3, characterized in that: The lifting plate (302) is inclinedly arranged on the end face of the liner (301).

4. A cantilever drying chamber for a dry ball mill according to claim 3, characterized in that: The discharge device (6) includes a discharge plate (601), one end of which is connected to a guide plate (602), and the central axis of the guide plate (602) and the discharge plate (601) are on the same straight line.

5. A cantilever drying chamber for a dry ball mill according to claim 4, characterized in that: The guide plate (602) is provided with a plurality of discharge plates (603) at one end near the discharge plate (601), and the discharge plates (603) are installed on the guide plate (602) in a circumferential distribution.

6. A cantilever drying chamber for a dry ball mill according to claim 5, characterized in that: A discharge cone (604) is installed between the discharge plate (601) and the guide plate (602).

7. A cantilever drying chamber for a dry ball mill according to claim 6, characterized in that: The guide plate (602) is embedded into one end of the discharge plate (601).

8. A cantilever drying chamber for a dry ball mill according to claim 6, characterized in that: The discharge cone (604) includes a mounting ring (6041), which is mounted on the end face of the guide plate (602). A connecting plate (6042) is mounted on the end face of the mounting ring (6041). The connecting plates (6042) are circumferentially distributed on the end faces of multiple mounting rings (6041). A fixing ring (6043) is provided between the multiple connecting plates (6042). A guard plate (6044) is mounted on the end face of the fixing ring (6043). One side of the end face of the guard plate (6044) is connected to the connecting plate (6042).

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