Roller disc type self-grading ore mill

Abstract

The invention discloses a roller disc type self-grading ore mill, which belongs to the technical field of grinding equipment, and comprises a mill shell, a millstone, a driving device, a rocker arm grinding roller mechanism and a premixing mechanism arranged at the upper part of the mill shell, the premixing mechanism is provided with a premixing bin, a stirrer located in the premixing bin, a feeding pipe communicated with the premixing bin and a discharging pipe used for conveying materials in the premixing bin to the millstone, and the discharging pipe is provided with a discharging control valve. According to the roller disc type self-grading ore mill, the high-efficiency and low-consumption characteristics of material bed grinding are kept, meanwhile, the problems of poor stability, large vibration, low efficiency and the like existing in wet grinding for a long time are solved by optimizing the feeding and mixing modes, and the roller disc type self-grading ore mill has remarkable popularization value and industrial application prospects.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of grinding equipment, and particularly relates to a roller disc type self-classifying ore mill. BACKGROUND

[0002] In the ore dressing industry, the mainstream equipment currently used for ore grinding is a wet ball mill, and the grinding principle thereof is based on a single particle impact crushing mechanism, that is, the grinding body (steel ball) in the ball mill is brought to a certain height with the rotation of the ball mill, and then freely falls, and the material is further crushed under the impact of the grinding body, and the process is repeated until the specified product fineness is reached.

[0003] The wet ball mill grinding is the mainstream grinding equipment for ore grinding in the ore dressing industry at present, but the disadvantages of this grinding mechanism are also obvious, such as high power consumption, low grinding efficiency, lack of internal classification mechanism, serious over-grinding, and low degree of automation of product detection.

[0004] The roller disc type grinding mechanism is a structure based on the material bed grinding mechanism, and the material bed grinding is a crushing mechanism in which materials are extruded and sheared with each other to complete the crushing process, and is widely used in the vertical mill. The vertical mill dry grinding technology has been applied in the cement production field for many years, and at present, most cement plants have basically realized "ball-free" production, that is, the vertical mill or roller press replaces the traditional dry ball mill for grinding work, and the vertical mill becomes one of the optimal choices for replacing the ball mill due to its low energy consumption, high output and low noise, and is widely used in the field of cement grinding.

[0005] However, in the ore dressing industry, the wet material bed grinding mechanism is rarely used, so it is necessary and meaningful to develop a wet mill with a roller disc type grinding structure based on the material bed grinding mechanism to replace the traditional wet ball mill from the aspects of improving product quality, increasing grinding efficiency and reducing energy consumption. SUMMARY

[0006] In view of the problems of low grinding efficiency, high energy consumption, lack of internal classification, serious over-grinding and low degree of automation of the wet ball mill in the prior art, the present application provides a roller disc type self-classifying ore mill.

[0007] The present application is achieved in that a roller disc type self-classifying ore mill comprises a mill shell, a grinding disc, a driving device and a rocker arm grinding roller mechanism, and is characterized in that a premixing mechanism is arranged on the upper part of the mill shell, the premixing mechanism is provided with a premixing bin, a stirrer located in the premixing bin, a feeding pipe communicated with the premixing bin, and a discharging pipe for conveying the material in the premixing bin to the grinding disc, and the discharging pipe is provided with a discharging control valve.

[0008] In the technical scheme, preferably, the stirrer comprises a stirring shaft and stirring blades, the stirring shaft is configured to be vertically arranged and is mounted on the mill housing and the premix bin through a bearing assembly, the stirring shaft is connected with the grinding disc and is driven to rotate around its axis by a driving device, and the stirring blades are mounted on the stirring shaft.

[0009] In the technical scheme, preferably, the feeding pipe comprises a new material feeding pipe and a recycled material feeding pipe arranged at the upper part of the premix bin.

[0010] In the technical scheme, preferably, the upper end of the discharging pipe is connected with the lower part of the premix bin and is arranged close to the outer edge of the premix bin, and the lower end of the discharging pipe is arranged close to the center of the grinding disc.

[0011] In the technical scheme, preferably, a liquid level sensor is arranged in the premix bin, and a water supply pipe is arranged at the upper part of the premix bin.

[0012] In the technical scheme, preferably, the upper disc surface of the grinding disc is provided with a lining plate, the lining plate is configured to have a ring-shaped spiral structure, and the spiral structure forms a continuously changing height difference in the circumferential direction. The spiral structure design enables self-classification of materials in the mill. Compared with the traditional ball mill, the mill can greatly improve the grinding efficiency, avoid over-grinding of materials, reduce the power consumption of grinding, and improve the quality of finished products.

[0013] In the technical scheme, preferably, the helix angle of the spiral structure of the lining plate satisfies the relationship, wherein, P is the pitch, and R is the helix radius, and the pitch P is 1.5-2 times the thickness of the material layer of the mill.

[0014] In the technical scheme, preferably, all the lining plates form a ring-shaped spiral part and a transition part, the ring-shaped spiral part is configured to have the ring-shaped spiral structure, and the transition part forms a continuously changing height difference in the opposite direction of the ring-shaped spiral part.

[0015] In the technical scheme, preferably, the lining plate with a closed loop structure is composed of ring-distributed lining plate units, the transition part is arranged at one of the lining plate units, and the remaining lining plate units are collectively configured to have the ring-shaped spiral part.

[0016] In the technical scheme, preferably, the grinding angle formed between the grinding roller of the rocker arm grinding roller mechanism and the lining plate is located at the lower side of the two angles formed on both sides of the grinding roller.

[0017] In the above technical solution, preferably, the outer edge of the grinding disc is provided with a rotary material blocking ring rotating with the grinding disc, and a suspension material blocking ring is arranged above the rotary material blocking ring, and an annular gap for discharging the grinding material is formed between the suspension material blocking ring and the rotary material blocking ring. The suspension screening mechanism is used to screen the material in the mill. The gap between the suspension material blocking ring and the conventional material blocking ring can be quickly adjusted by a hydraulic cylinder outside the mill shell, so that the fineness of the finished product discharged from the mill can be conveniently and quickly controlled.

[0018] In the above technical solution, preferably, the suspension material blocking ring is installed on the mill shell in a vertically height-adjustable manner. In the above technical solution, preferably, the suspension material blocking ring is configured to have a ring shape at the lower part and a flared shape at the upper part.

[0019] In the above technical solution, preferably, a secondary crushing mechanism is arranged between the outer side of the grinding disc and the mill shell, and the secondary crushing mechanism comprises a crushing dynamic ring arranged on the grinding disc and a crushing static ring arranged on the mill shell. The secondary crushing mechanism can be used to crush large-size materials that have escaped from the screening or large-size materials that have been flattened by the suspension screening mechanism. The proportion of large-size materials in the feed is reduced, and the stability of the mill operation is improved.

[0020] In the above technical solution, preferably, the crushing dynamic ring and the crushing static ring are composed of crushing teeth arranged uniformly and spaced in the ring direction, and the crushing teeth of the crushing dynamic ring and the crushing static ring are arranged in an up-and-down staggered manner.

[0021] The roller disc self-classification ore mill has the key optimization of the traditional wet grinding method by arranging a premixing mechanism, and has many significant advantages and technical effects.

[0022] Firstly, the mill is provided with a premixing bin on the upper part of the mill shell, and is matched with a stirrer, a feeding pipe, a discharging control valve and other components, so that the new feeding material and the external circulating material are fully mixed with water before entering the grinding area, to form a uniform and stable slurry. This design significantly improves the uniformity of the material entering the mill, ensures the stability of the material layer and the consistency of the material bed structure, and provides a basic condition for efficient material bed grinding. Secondly, the premixing process effectively avoids the high-frequency vibration phenomenon of the mill caused by problems such as uneven dry and wet material and instantaneous concentration fluctuation, significantly reduces the impact load and mechanical fatigue during equipment operation, improves the stability and reliability of the equipment operation, and helps to prolong the service life of key components such as the grinding roller, the rocker arm and the grinding disc.

[0023] In addition, the material after premixing forms a dense and continuous material bed, which can realize more sufficient extrusion and shearing crushing under the action of the roller disc structure, thereby improving the grinding efficiency per unit time, reducing the idle energy consumption and invalid motion, and significantly reducing the energy consumption level under unit capacity. While improving the grinding efficiency, the device runs more stably, the finished product particle size distribution is more concentrated, and an ideal material basis is provided for subsequent classification, flotation and other processes. In summary, the roller disc self-classification ore mill maintains the characteristics of high efficiency and low consumption of the material bed grinding, optimizes the feeding and mixing mode, solves the problems of poor stability, large vibration and low efficiency in wet grinding for a long time, and has significant popularization value and industrial application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The roller disc self-classification ore mill provided by the embodiment of the application is shown in the whole structure diagram.

[0025] Figure 2 The spiral lining structure diagram provided by the embodiment of the application is shown.

[0026] Figure 3 The structure diagram of the secondary crushing mechanism and the internal part of the suspension separation mechanism provided by the embodiment of the application is shown.

[0027] Figure 4 The external support structure diagram of the suspension separation mechanism mill shell provided by the embodiment of the application is shown.

[0028] Figure 5 The structure diagram of the lower limiting sleeve of the premixing mechanism stirring shaft provided by the embodiment of the application is shown.

[0029] Figure 6 The bearing assembly of the premixing mechanism stirring shaft at the mill shell cover plate and the sealing structure below the premixing bin provided by the embodiment of the application are shown in the structure diagram.

[0030] Figure 7 The bearing assembly structure diagram of the premixing mechanism stirring shaft at the premixing bin cover plate provided by the embodiment of the application is shown.

[0031] In the figure: 1, premixing mechanism; 1-1, stirring shaft; 1-2, stirring blade; 1-3, feeding pipe; 1-4, limiting sleeve; 1-5, bearing assembly; 1-5-1, bearing cover; 1-5-2, bearing; 1-5-3, bearing seat; 1-6, feeding pipe; 1-7, circulating pipe; 1-8, liquid level sensor; 1-9, electric knife gate valve; 1-10, water supply pipe; 1-11, sealing ring; 1-12, premixing bin; 1-13, premixing bin cover plate; 2, mill shell; 2-1, shell cover plate; 3, rocker arm mill roller mechanism; 4, suspension sorting mechanism; 4-1, suspension material blocking ring; 4-2, material blocking ring cover plate; 4-3, support frame; 4-4, hydraulic cylinder; 4-5, support bolt; 4-6, locking nut; 4-7, nut; 5, secondary crushing mechanism; 5-1, crushing dynamic ring; 5-2, crushing static ring; 6, grinding disc; 7, rotary material blocking ring; 8, spiral lining plate; 9, frame; 10, driving device; 11, material scraping plate; 12, discharge bin; 13, pressurized oil cylinder. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0033] In order to solve the problems of low grinding efficiency, high energy consumption, lack of classification in the mill, serious over-grinding and low automation degree of the wet ball mill in the prior art, the present application provides a roller disc self-classification ore mill. In order to further illustrate the structure of the present application, the detailed description is as follows in combination with the drawings: Please refer to Figure 1 A roller disc self-classification ore mill, comprising a mill housing 2, a grinding disc 6, a driving device 10, a rocker arm grinding roller mechanism 3, a material scraping plate 11, a discharge bin 12 and a pressurized oil cylinder 13.

[0034] The mill housing 2 is fixed on the frame 9, and the axis of the mill housing 2 needs to be strictly concentric with the center of the mill. The frame 9 is installed on the concrete foundation and is responsible for bearing all the dynamic and static loads of the mill. The mill housing 2 prevents the overflow of a large amount of dust and the splashing of gravel and slurry, ensuring the safety of production. The driving device 10 is generally composed of a motor and a speed reducer and is installed on the concrete foundation. The speed reducer is connected with the grinding disc 6 and is responsible for driving the grinding disc 6 to rotate. It bears the static load of the grinding disc 6 and the material on the disc surface as well as the dynamic load applied to the grinding disc 6 by the rocker arm grinding roller mechanism 3 during the operation of the mill. The rotation center of the grinding disc 6 needs to be strictly concentric with the output shaft of the speed reducer and serves as the center of the mill. The bearing seat of the rocker arm grinding roller mechanism 3 is installed on the upper part of the frame 9, and the upper ear ring of the pressurized oil cylinder 13 is connected below it. The lower ear ring of the pressurized oil cylinder 13 is connected with the lower part of the frame 9 by a pin shaft. During the operation of the mill, the pressurized oil cylinder 13 applies a downward oblique pulling force to the rocker arm grinding roller mechanism 3, which makes a circular motion along its bearing, driving the grinding roller to grind the material on the grinding disc.

[0035] The discharge bin 12 is connected to the frame 9 and is responsible for collecting the material separated from the grinding disc 6. Several scraper blades 11 are installed on the side wall of the grinding disc 6 and rotate with the grinding disc 6, responsible for pushing the material in the discharge bin 12. The discharge bin 12 has a discharge port. When the material is pushed to the discharge port by the scraper blades 11, the material falls and is discharged from the mill. The screened material is discharged into the discharge bin through the suspension separation mechanism and the secondary crushing mechanism. The discharge bin is connected to the support and is responsible for collecting the material separated from the grinding disc. Several scraper blades are installed on the side wall of the grinding disc and rotate with the grinding disc, responsible for pushing the material in the discharge bin. The discharge bin has a discharge port. When the material is pushed to the discharge port by the scraper blades, the material falls and is discharged from the mill.

[0036] This roller-disc self-grading ore mill includes a premixing mechanism 1 located on the upper part of the mill shell. Based on the bed grinding mechanism, the mill employs a roller-disc grinding system. Before entering the mill, the material is first mixed by the premixing mechanism to ensure a more uniform mixture of the new feed, circulating material, and water. The premixing mechanism includes a premixing hopper 1-12, a stirrer located within the premixing hopper, a feed pipe communicating with the premixing hopper, and a discharge pipe that transports the material from the premixing hopper to the grinding disc. The discharge pipe is equipped with a discharge control valve. In this embodiment, the discharge control valve is an electric gate valve 1-9.

[0037] Furthermore, the agitator includes a stirring shaft 1-1 and stirring blades 1-2. The stirring blades 1-2 are mounted on the stirring shaft 1-1. The stirring shaft 1-1 is configured with a vertical axis and is mounted on the mill housing 2 and the premix bin 1-1 via a bearing assembly 1-5. The stirring shaft 1-1 is connected to the grinding disc 6 and is driven by a drive device 10 to rotate around its own axis. In this embodiment, specifically, the premixing mechanism 1 is installed above the mill housing 2, wherein the premix bin 1-12 is connected to the mill housing cover plate 2-1; the lower end of the stirring shaft 1-1 is fixed at the center of the grinding disc 6 and extends into the interior of the grinding disc 6, such as... Figure 5 The limiting sleeve 1-4 is fixed inside the grinding disc 6, fitting over the portion of the stirring shaft 1-1 inside the grinding disc 6, thus limiting the displacement of the stirring shaft 1-1. Because the stirring shaft 1-1 is relatively long and rotates under load during operation, bearing assemblies 1-5 are added at the mill housing cover plate 2-1 and the mixing chamber cover plate 1-13 to stabilize the rotation of the stirring shaft 1-1. Several stirring blades 1-2 are mounted on the stirring shaft 1-1, and the connection method can be welding or bolting. Figure 6 and Figure 7 The bearing assembly includes a bearing housing cover 1-5-1, a bearing 1-5-2, and a bearing housing 1-5-3. A sealing ring 1-11 is provided between the stirring shaft 1-1 and the bearing housing cover 1-5-1.

[0038] The feeding pipe includes a new material feeding pipe 1-6 and a recycled material feeding pipe 1-7 arranged at the upper part of the premixing bin. A liquid level sensor 1-8 is arranged in the premixing bin, and a water supply pipe 1-10 is arranged at the upper part of the premixing bin.

[0039] The upper port of the downpipe is connected to the lower part of the premixing bin and arranged close to the outer edge of the premixing bin, and the lower port of the downpipe is arranged close to the center of the grinding disc. The premixing mechanism 1 is provided with two downpipes 1-3, which are installed below the cover plate 2-1 of the mill housing, and each downpipe 1-3 is equipped with an electric knife gate valve 1-9 for adjusting the downfeed amount.

[0040] The mechanism has a self-adjusting mechanism for the liquid level in the bin, adopts double downpipes, each of which is equipped with an electric knife gate valve, the top of the premixing bin is equipped with a liquid level sensor, and high / low liquid level values are set. The central control system can automatically control the opening and closing actions of the electric knife gate valve according to the liquid level in the bin, so that the feeding amount and the amount of material in the bin reach a dynamic balance.

[0041] Please refer to Figure 2 The upper disc surface of the grinding disc 6 is provided with a lining plate 8, which is configured to have a ring-shaped spiral structure, and the spiral structure forms a continuously changing height difference in the circumferential direction. The helix angle of the spiral structure of the lining plate 8 satisfies the relationship:

[0042] wherein, wherein P is the pitch, R is the spiral radius, and the pitch P is 1.5-2 times the thickness of the mill material layer. All the lining plates 8 form a ring-shaped spiral part configured as the ring-shaped spiral structure and a transition part forming a continuously changing height difference in the opposite direction of the ring-shaped spiral part. The closed-loop configured lining plate 8 is composed of ring-distributed lining plate units, and the transition part is configured at one of the lining plate units, and the remaining lining plate units are collectively configured as the ring-shaped spiral part. The grinding angle formed between the grinding roller of the swing arm grinding roller mechanism and the lining plate is at the low position of the two angles formed on both sides of the grinding roller.

[0043] The lining plate 8 of the grinding disc 6 adopts a spiral structure design, so that the coarse and fine materials can be self-classified in the mill. The fine particles are taken away from the grinding disc under the action of centrifugal force and water flow and discharged outside the mill through the suspension separation mechanism. The coarse particles adhere to the lining plate of the grinding disc and continue to participate in the grinding work until they are ground fine. The material will "climb" along the spiral line of the lining plate, and because the friction forces of different fineness materials on the lining plate are different, the finer materials will be taken away by the water flow, and the coarser materials will be adsorbed on the lining plate for regrinding, thereby realizing self-classification of coarse and fine materials.

[0044] As Figure 3 and Figure 4, the outer edge of the grinding disc 6 is provided with a rotary material blocking ring 14 which rotates with the grinding disc, and above the rotary material blocking ring 14 is provided with a suspension material blocking ring 4-1, and between the rotary material blocking ring 14 and the suspension material blocking ring 4-1 is formed an annular gap for discharging the grinding material. The rotary material blocking ring 14 is a conventional material blocking ring mounted on the grinding disc, which rotates with the grinding disc during the operation of the mill, and the enclosed height determines the thickness of the material layer in the mill and the water storage amount, which will directly affect the fineness and density of the finished product of the mill.

[0045] The suspension material blocking ring 4-1 is mounted on the mill housing 2 in a vertically height-adjustable manner. The suspension material blocking ring 4-1 is configured to have a ring shape at the lower part and a flared shape at the upper part. There is an annular gap between the suspension material blocking ring 4-1 and the conventional material blocking ring in the mechanism, which can be adjusted up and down by a hydraulic cylinder outside the suspension separation mechanism mill, to control the particle size of the finished product discharged from the mill.

[0046] The outer side of the grinding disc 6 and the mill housing 2 are provided with a secondary crushing mechanism 5, which includes a crushing dynamic ring 5-1 provided on the grinding disc 6 and a crushing static ring 5-2 provided on the mill housing. The crushing dynamic ring 5-1 and the crushing static ring 5-2 are composed of crushing teeth uniformly and spacedly arranged in the annular direction, and the crushing teeth of the crushing dynamic ring 5-1 and the crushing static ring 5-2 are staggered arranged in the up-down direction.

[0047] In this embodiment, specifically, when the suspension separation mechanism 4 is installed, first, according to the required fineness of the finished product, the gap between the suspension material blocking ring 4-1 and the rotary material blocking ring 14 is set, the support frame 4-3 located outside the mill housing 2 is adjusted up and down by the hydraulic cylinder 4-4 below it, and the hydraulic cylinder 4-4 is connected with the rack 9; after the suspension material blocking ring 4-1 is adjusted to the right position, it is bolted with the support frame 4-3, and the mill housing 2 is located between the two, the mill housing 2 needs to be pre-drilled with long holes at the bolt positions to facilitate the adjustment of the suspension separation mechanism. When the suspension material blocking ring 4-1 and the support frame 4-3 are fixed, the support bolt 4-5 is placed in the bolt hole of the support frame 4-3, the lower surface of the support bolt 4-5 abuts against the upper surface of the rack 9, and the support bolt is fastened to the support frame 4-3 by the nut 4-7, at the same time, the locking nut 4-6 is tightened to prevent the loosening of the support nut 4-5. After the above work is completed, one end of the material blocking cover plate 4-2 is fixed to the upper surface of the suspension material blocking ring 4-1, and the other end is fixed to the mill housing. Further, a cover plate is provided between the suspension material blocking ring 4-1 and the mill housing 2 to prevent overflow when too much slurry in the mill overflows the suspension material blocking ring.

[0048] The secondary crushing mechanism 5 is composed of a crushing dynamic ring 5-1 and a crushing static ring 5-2, wherein the crushing dynamic ring 5-1 is connected with the grinding disc 6 through bolts and rotates with the grinding disc 6; and the crushing static ring 5-2 is connected with the mill rack 9 through bolts. The secondary crushing mechanism 5 performs secondary crushing on large-size materials that have not been screened or large-size materials that have been subjected to the suspension separation mechanism. A plurality of crushing teeth are distributed on the crushing dynamic ring 5-1 and the crushing static ring 5-2, and the crushing teeth on the dynamic ring and the static ring are staggered and distributed to shear and cut large-size materials, so as to achieve the purpose of crushing.

[0049] Embodiments of the present application provide a roller disc self-classification ore mill, and the operation process is described as follows: 1. Preparation. Before starting, it is ensured that the grinding roller is in a raised state and cannot contact the grinding disc 6, and there is no foreign matter such as maintenance tools in the mill; the electric knife gate valves in the premixing mechanism 1 are all in a closed state; after the inspection is completed, the driving device 10 is started to drive the grinding disc 6 to rotate, and at the same time, the stirring shaft 1-1 also rotates with the grinding disc 6.

[0050] 2. Premixing. After the preparation is completed, the feeding is started, and the new feeding, the external circulating material and the water enter the premixing bin 1-12 through the feeding pipe 1-6, the circulating material pipe 1-7 and the water pipe 1-10, respectively, and the premixing work is started under the action of the stirring shaft 1-1 driving the stirring blade 1-2; with the rising of the liquid level in the premixing bin 1-12, when the high liquid level setting value is reached, the liquid level sensor 1-8 sends an instruction to the control system, and the control system opens the electric knife gate valve 1-9 to start the feeding into the mill.

[0051] In particular, the control system can automatically control the opening and closing actions of the electric knife gate valve according to the liquid level in the bin. When the liquid level in the premixing bin decreases too fast and the low limit value of the liquid level sensor 1-8 is triggered, the liquid level sensor 1-8 sends an instruction to the control system, and the control system closes one of the two electric knife gate valves 1-9 to reduce the feeding amount; if the liquid level still decreases too fast at this time and the low limit warning value of the liquid level sensor is triggered, the liquid level sensor 1-8 sends an instruction to the control system, and the control system immediately closes the two electric knife gate valves 1-9 to ensure the stability of the liquid level in the premixing bin 1-12 and achieve the dynamic balance of the feeding amount and the amount of materials in the bin. This adjustment process can also be switched to a manual mode for manual operation.

[0052] 3. Feeding and Grinding. The mixed material reaches the grinding disc from the feed pipe 1-3. When slurry begins to be discharged from the discharge port of the discharge bin 12, the rollers begin to pressurize and grind the material inside the mill. During the grinding process, the grinding disc liner 8 automatically classifies the coarse and fine materials. Materials that meet the fineness requirements will be discharged from the grinding disc 6 through the suspension sorting mechanism 4 and enter the secondary crushing mechanism 5. Coarse materials that do not meet the fineness requirements will continue to be ground and classified inside the mill until they meet the fineness requirements and are discharged from the grinding disc 6. The secondary crushing mechanism 5 can perform secondary crushing on large-sized materials that have not escaped screening or flat large-sized materials that have passed through the suspension sorting mechanism 4, reducing the proportion of large-sized materials in the feed and improving the stability of the mill operation. After passing through the suspension sorting mechanism 4 and the secondary crushing mechanism 5, the material will be discharged into the discharge bin 12. The discharge bin 12 is equipped with a discharge port. When the material is pushed to the discharge port by the scraper 11, the material falls and is discharged from the mill.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A roller pan self-classifying ore mill comprising a mill housing, a mill pan, a drive means and a rocker arm mill roller mechanism characterised in that: The pre-mixing mechanism is arranged on the upper portion of the mill housing, and comprises a pre-mixing bin, a stirrer arranged in the pre-mixing bin, a feeding pipe communicated with the pre-mixing bin, and a discharging pipe for conveying the material in the pre-mixing bin to the mill disc, wherein the discharging pipe is provided with a discharging control valve.

2. The roller pan self-classifying ore mill according to claim 1, characterized in that: The stirrer comprises a stirring shaft and stirring blades, wherein the stirring shaft is arranged vertically and is mounted on the mill housing and the pre-mixing bin through a bearing assembly, the stirring shaft is connected with the mill disc and is driven to rotate around its own axis by a driving device, and the stirring blades are mounted on the stirring shaft.

3. The roll pan self-classifying ore mill according to claim 1, characterized in that: The feeding pipe comprises a new material feeding pipe and a recycled material feeding pipe arranged on the upper portion of the pre-mixing bin.

4. The roll pan self-classifying ore mill according to claim 1, characterized in that: The upper end of the discharging pipe is connected with the lower portion of the pre-mixing bin and is arranged close to the outer edge of the pre-mixing bin, and the lower end of the discharging pipe is arranged close to the center of the mill disc.

5. The roll pan self-classifying ore mill according to claim 1, characterized in that: A liquid level sensor is arranged in the pre-mixing bin, and a water supply pipe is arranged on the upper portion of the pre-mixing bin.

6. The roll pan self-classifying ore mill according to claim 1, characterized in that: The upper disc surface of the mill disc is provided with a lining plate, wherein the lining plate is arranged in a ring-shaped spiral structure, and the spiral structure forms a continuously and gradually changed height difference in the circumferential direction.

7. A roll pan self-classifying ore mill according to claim 6, characterised in that: the helix angle of the spiral configuration of the liner satisfying the relationship wherein, wherein P is the pitch, R is the helix radius, the pitch P is 1.5-2 times the mill bed depth.

8. A roll pan self-classifying ore mill according to claim 7, characterised in that: All the lining plates form a ring-shaped spiral part arranged in the ring-shaped spiral structure and a transition part forming a continuously and gradually changed height difference in the opposite direction of the ring-shaped spiral part.

9. A roll pan self-classifying ore mill according to claim 8, characterised in that: The lining plate arranged in the closed loop structure is composed of lining plate units uniformly arranged in the ring direction, and the transition part is arranged in one of the lining plate units, and the remaining lining plate units are collectively arranged in the ring-shaped spiral part.

10. A roll pan self-classifying ore mill according to claim 9, characterised in that: The grinding angle formed between the mill roller of the rocker mill roller mechanism and the lining plate is located at the lower side of the two angles formed on both sides of the mill roller.

11. The roll pan self-classifying ore mill according to claim 10, characterized in that: The outer edge of the mill disc is provided with a rotary material blocking ring rotating with the mill disc, and a suspended material blocking ring is arranged above the rotary material blocking ring, and an annular gap for discharging the ground material is formed between the suspended material blocking ring and the rotary material blocking ring.

12. The roll pan self-classifying ore mill according to claim 11, characterized in that: The suspended material blocking ring is arranged on the mill housing in a vertically height-adjustable manner.

13. The roll pan self-classifying ore mill according to claim 12, characterized in that: The suspended material blocking ring is arranged in a ring shape at the lower portion and in a flared shape at the upper portion.

14. The roll pan self-classifying ore mill according to claim 3, characterized in that: A secondary crushing mechanism is arranged between the outer side of the mill disc and the mill housing, and the secondary crushing mechanism comprises a crushing dynamic ring arranged on the mill disc and a crushing static ring arranged on the mill housing.

15. The roll pan self-classifying ore mill according to claim 3, characterized in that: The crushing dynamic ring and the crushing static ring are composed of crushing teeth uniformly and regularly arranged in the ring direction, and the crushing teeth of the crushing dynamic ring and the crushing static ring are arranged in a staggered manner in the up-down direction.

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