A step mill

Abstract

The utility model discloses a kind of stage type ore grinder, belong to ore grinder technical field, including box and feed pipe, the bottom wall rotation of box inner chamber is equipped with mill disc, mill disc top is provided with at least two transverse placement and rotates around its axis mill roller, box bottom is provided with the drive assembly of driving mill disc and mill roller synchronous rotation, box bottom is provided with the air flow component of hot air blowing upwards;The center of box top wall is equipped with discharge gate, the center of the top wall rotation of box inner chamber is equipped with screening cylinder, screening cylinder is fixedly penetrated with rotating rod, and the outside of the inner chamber of screening cylinder is fixed with fan blade with rotating rod;The bottom of rotating rod is fixed with rotating motor, and rotating motor is fixed in box inner chamber by protection shell.The utility model provides a kind of integrated ore grinding and grading equipment with compact structure, high efficiency and low energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of grinding mill technology, and in particular to a classifying grinding mill. Background Technology

[0002] In many industrial fields such as mineral processing, chemical industry, building materials, thermal power, pharmaceuticals and new energy materials, powder processing is an indispensable key link. Its core task is to crush and grind blocky or granular raw materials by mechanical force to prepare fine powders with specific particle size distribution to meet the requirements of subsequent processes or product performance.

[0003] The traditional way to achieve this goal usually involves a multi-equipment process. For example, the material is first crushed using conventional grinding mills such as ball mills, Raymond mills, or vertical mills. Then, the crushed material is sent to an independent classifier (such as a turbine classifier or cyclone separator) for screening via external conveying equipment (such as bucket elevators or pneumatic conveying pipelines). In the classifier, qualified fine powder is collected as the product, while unqualified coarse powder needs to be returned to the grinding mill for secondary grinding via a conveying system.

[0004] Multiple unit equipment such as grinding mills, classifiers, and conveying equipment need to be installed and debugged independently, forming a huge and complex production line. This not only occupies a lot of production space but also increases infrastructure investment costs. Furthermore, the transfer of materials between different equipment will cause transmission delays. Utility Model Content

[0005] The purpose of this invention is to provide an integrated grinding and classifying equipment that is compact, efficient, and energy-saving.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a classifying grinding mill, comprising a housing and a feed pipe, wherein a grinding disc is rotatably mounted on the bottom wall of the inner cavity of the housing, and at least two horizontally placed grinding rollers are provided on the top of the grinding disc and rotate around its axis, a driving assembly for driving the grinding disc and grinding rollers to rotate synchronously is provided at the bottom of the housing, and an airflow assembly for blowing hot air upwards is provided at the bottom of the housing.

[0007] The box body has a discharge port at the center of the top wall, and a screening cylinder is rotatably installed at the center of the top wall of the inner cavity of the box body. A rotating rod is fixedly inserted through the screening cylinder, and a fan blade is fixed on the outside of the inner cavity of the screening cylinder.

[0008] A rotary motor is fixed to the bottom of the rotating rod, and the rotary motor is fixed to the inner cavity of the box through a protective shell.

[0009] As a further description of the above technical solution: the drive assembly includes a drive motor disposed at the bottom of the housing, a rotating column fixed at the bottom of the grinding disc, the rotating column penetrating the bottom wall of the housing and fixedly connected to the output end of the drive motor.

[0010] As a further description of the above technical solution: a main gear is fixed on the outer ring of the rotating column, and a transmission rod corresponding to the number of grinding rollers is rotatably installed at the bottom of the housing. A secondary gear that meshes with the main gear is fixed at one end of the transmission rod near the main gear.

[0011] As a further description of the above technical solution: one end of the grinding roller passes through the side wall of the housing and is rotatably connected to it, and the other end of the transmission rod is connected to the end of the grinding roller that passes through the housing via a belt drive.

[0012] As a further description of the above technical solution: the airflow assembly includes an annular shell, which is sleeved on the outer ring of the rotating column and fixedly connected to the bottom wall of the box. The outer ring of the annular shell is provided with an air inlet pipe, and the inner cavity is connected to the rotating column through an opening.

[0013] As a further description of the above technical solution: the grinding disc and the rotating column are provided with a connected cylindrical space, and the side wall of the rotating column is provided with a circular hole, which connects the cylindrical space with the inner cavity of the annular shell.

[0014] As a further description of the above technical solution: a protective net is embedded at the center of the top surface of the grinding disc, and the protective net covers the top opening of the cylindrical space.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. Integrating grinding and classification functions into the same housing greatly simplifies the equipment structure, reduces the equipment footprint, lowers civil engineering and installation costs, and also simplifies production line maintenance.

[0017] 2. Synchronous rotation between the grinding roller and the grinding disc is achieved, ensuring that the grinding roller always applies stable grinding pressure and shearing force to the material, thereby significantly improving grinding efficiency and material crushing effect, and making the wear more uniform.

[0018] 3. After being crushed, the material is immediately carried into the grading zone by the rising airflow for sorting. Qualified fine powder is discharged in time, while unqualified coarse powder is immediately returned to the grinding zone, reducing the residence time of the material in the mill and effectively avoiding the repeated grinding of qualified material. Attached Figure Description

[0019] Figure 1 A front view of the present invention is shown;

[0020] Figure 2 A side view of the present invention is shown.

[0021] Legend:

[0022] 10. Housing; 101. Feed pipe; 102. Discharge port; 11. Grinding disc; 12. Grinding roller; 13. Screening cylinder; 14. Rotating rod; 15. Fan blade; 16. Rotary motor; 17. Protective shell; 18. Drive motor; 19. Rotating column; 191. Circular hole; 20. Main gear; 21. Transmission rod; 22. Secondary gear; 23. Annular shell; 231. Air inlet pipe; 24. Protective net. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-2 This utility model provides a technical solution: a classifying grinding mill, including a housing 10, a grinding component disposed inside the housing 10, a screening component disposed on the top of the housing 10, a drive component that provides power to the grinding component, and an airflow component that provides upward airflow.

[0025] Specifically, the housing 10 has a hollow structure, with a feed pipe 101 at the top of its top wall for adding the material to be crushed into the equipment, and a discharge port 102 at the center of the top wall of the housing 10 for discharging the finished powder that has passed the screening.

[0026] The grinding assembly is located in the lower part of the inner cavity of the housing 10. A horizontally arranged grinding disc 11 is rotatably installed on the bottom wall of the inner cavity of the housing 10. At least two grinding rollers 12 are arranged above the top of the grinding disc 11. The grinding rollers 12 are placed horizontally and can rotate around their own axis. During operation, the material is crushed by being crushed and ground between the grinding disc 11 and the grinding rollers 12.

[0027] The drive assembly is located at the bottom of the housing 10. Its core is a drive motor 18. A vertical rotating column 19 is fixedly connected to the bottom center of the grinding disc 11. The rotating column 19 passes downward through the bottom wall of the housing 10 and is fixedly connected to the output end of the drive motor 18. Therefore, after the drive motor 18 is started, it can directly drive the rotating column 19 and the grinding disc 11 to rotate.

[0028] In order to achieve synchronous rotation of the grinding roller 12 and the grinding disc 11, a main gear 20 is fixedly sleeved on the outer ring of the rotating column 19. At the bottom of the housing 10, a transmission rod 21 is rotatably installed corresponding to the position of each grinding roller 12. A secondary gear 22 that meshes with the main gear 20 is fixed at one end of each transmission rod 21 near the main gear 20. When the main gear 20 rotates with the rotating column 19, it will drive the secondary gear 22 and the transmission rod 21 to rotate through meshing.

[0029] The other end of the transmission rod 21 is connected to one end of the corresponding grinding roller 12 via belt drive. Specifically, one end of the grinding roller 12 passes through the housing 10 and is connected to the transmission belt, thereby transmitting power to the grinding roller 12 so that it rotates synchronously with the grinding disc 11, improving grinding efficiency and uniformity.

[0030] The airflow assembly is used to generate hot air to convey the crushed material upward. The assembly includes an annular shell 23, which is fixed to the bottom wall of the box 10 and fitted around the outer ring of the rotating column 19. The annular shell 23 has a hollow structure and an air inlet pipe 231 is provided on its outer ring wall for connecting to an external hot air source.

[0031] In order to introduce hot air into the mill, a cylindrical space that runs vertically through the center of the grinding disc 11 and the rotating column 19 is provided. At the same time, at least one circular hole 191 is provided on the side wall of the rotating column 19, which connects the cylindrical space and the inner cavity of the annular shell 23. In this way, hot air enters the annular shell 23 through the air inlet pipe 231, then enters the central cylindrical space through the circular hole 191, and finally blows upward from the center of the grinding disc 11.

[0032] To prevent material particles from falling into the cylindrical space and causing blockage, a protective net 24 is embedded at the center of the top surface of the grinding disc 11, i.e., at the opening of the cylindrical space.

[0033] The screening assembly is located in the upper part of the inner cavity of the box 10. The screening assembly includes a hollow screening cylinder 13. The screening cylinder 13 is rotatably installed at the center of the top wall of the inner cavity of the box 10, and its position is directly opposite the grinding disc 11 below. A rotating rod 14 is coaxially fixed through the screening cylinder 13. The part of the rotating rod 14 located in the inner cavity of the screening cylinder 13 has multiple fan blades 15 fixedly welded to its outer side.

[0034] An independent rotary motor 16 is fixedly connected to the bottom of the rotating rod 14. The rotary motor 16 is used to drive the rotating rod 14, the fan blade 15 and the screening cylinder 13 to rotate at high speed. In order to protect the rotary motor 16, a protective shell 17 fixed to the housing 10 is also provided on its exterior.

[0035] Work steps:

[0036] The material to be crushed enters the housing 10 through the feed pipe 101 and falls onto the rotating grinding disc 11 due to gravity. Under the action of centrifugal force, the material is thrown towards the edge of the grinding disc 11 and enters the grinding zone between the grinding disc 11 and the synchronously rotating grinding roller 12, where it is repeatedly crushed, sheared and crushed.

[0037] Meanwhile, external hot air is blown upward from the center of the grinding disc 11 through the air inlet pipe 231, the annular shell 23 and the round hole 191 on the rotating column 19. This rising hot airflow blows up the crushed material particles and dries the material in the process.

[0038] The airflow carrying the material rises to the screening area at the top of the box 10. At this time, the rotary motor 16 drives the screening cylinder 13 and the internal fan blades 15 to rotate at high speed. The qualified fine powder with small particle size and light weight can follow the airflow through the high-speed rotating screening cylinder 13 and finally be extracted from the discharge port 102 at the top of the box 10 and enter the subsequent collection system.

[0039] Larger, heavier coarse particles, due to their greater inertia, cannot follow the airflow through the sieve cylinder 13. They are thrown off by the centrifugal force generated by the rotating sieve cylinder 13. After losing speed, these coarse particles fall along the inner wall of the box 10 and return to the grinding disc 11 below for further grinding.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A classifying mill, comprising a housing (10) and a feed pipe (101), characterized in that: The bottom wall of the inner cavity of the box (10) is rotatably mounted with a grinding disc (11). At least two grinding rollers (12) are placed horizontally and rotate around their axis on the top of the grinding disc (11). The bottom of the box (10) is provided with a drive assembly that drives the grinding disc (11) and the grinding rollers (12) to rotate synchronously. The bottom of the box (10) is provided with an airflow assembly that blows hot air upwards. The box (10) has a discharge port (102) at the center of the top wall. A screening cylinder (13) is rotatably installed at the center of the top wall of the inner cavity of the box (10). A rotating rod (14) is fixedly inserted through the screening cylinder (13). A fan blade (15) is fixed on the outside of the inner cavity of the screening cylinder (13). A rotary motor (16) is fixed to the bottom of the rotating rod (14), and the rotary motor (16) is fixed to the inner cavity of the box (10) through the protective shell (17).

2. A classifying mill according to claim 1, characterized in that: The drive assembly includes a drive motor (18) located at the bottom of the housing (10), and a rotating column (19) fixed at the bottom of the grinding disc (11). The rotating column (19) passes through the bottom wall of the housing (10) and is fixedly connected to the output end of the drive motor (18).

3. A classifying mill according to claim 2, characterized in that: The outer ring of the rotating column (19) is fixed with a main gear (20), and the bottom of the housing (10) is rotatably mounted with a transmission rod (21) corresponding to the number of grinding rollers (12). The end of the transmission rod (21) near the main gear (20) is fixed with a secondary gear (22) that meshes with the main gear (20).

4. A classifying mill according to claim 3, characterized in that: One end of the grinding roller (12) passes through the side wall of the housing (10) and is rotatably connected to it, and the other end of the transmission rod (21) is connected to the end of the grinding roller (12) that passes through the housing (10) via a belt drive.

5. A classifying mill according to claim 2, characterized in that: The airflow assembly includes an annular shell (23), which is fitted around the outer ring of the rotating column (19) and fixedly connected to the bottom wall of the box (10). The outer ring of the annular shell (23) is provided with an air inlet pipe (231), and the inner cavity is connected to the rotating column (19) through an opening.

6. A classifying mill according to claim 5, characterized in that: The grinding disc (11) and the rotating column (19) are provided with a connected cylindrical space. The side wall of the rotating column (19) is provided with a circular hole (191), which connects the cylindrical space with the inner cavity of the annular shell (23).

7. A classifying mill according to claim 6, characterized in that: A protective net (24) is embedded in the center of the top surface of the grinding disc (11), and the protective net (24) covers the top opening of the cylindrical space.

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