CN111992303A - Mill Classifier - Google Patents

Abstract

The invention discloses a mill classification device, which is suitable for a horizontal mill. The mill classification device is arranged on a drive shaft of the horizontal mill close to the discharge end, and includes sequentially sleeves along the material traveling direction. A centrifugal disc and a classification rotor on the drive shaft; a cylindrical screen is embedded in the classification rotor, one end of the cylindrical screen is fixedly connected to the end face of the drive shaft, and the other side of the cylindrical screen is fixedly connected. A discharge hole is formed in the center of one end, and a discharge pipe is fixedly connected in the discharge hole; a plurality of flow-through holes are formed on both the centrifugal disc and the classification rotor. The mill classification device is installed in the discharge section of the horizontal mill and shares the same drive shaft with the horizontal mill. It can perform centrifugal classification and screening classification on the materials in the discharge section of the mill without independent screening. operation, reducing processing costs.

Description

Mill Classifier

technical field

The invention relates to the technical field of grinding equipment, in particular to a classification device for a mill.

Background technique

At present, the grinding equipment mainly includes autogenous (semi-autogenous) mills, rod mills, ball mills, vertical mills, etc. Among these mills, autogenous (semi-autogenous) mills and rod mills belong to coarse grinding equipment, while ball mills and vertical mills belong to fine grinding equipment. The product particle size of ball mill and vertical mill is mostly about P80=100-15 microns, and the energy consumption is high when used for fine grinding. However, the current grinding particle size of many minerals is P80=5-15 microns, so the above-mentioned mill must add an independent classification operation program after the grinding operation is completed, such as screening classification or cyclone classification. The coarse-grained part after mineral classification is returned to the mill to continue the grinding operation, while only the fine-grained part meets the particle size requirements as a qualified product. This independent grading operation extends the entire grinding operation process, resulting in significantly higher grinding costs and energy consumption, while also increasing the footprint of the grinding equipment.

SUMMARY OF THE INVENTION

The invention provides a mill classification device with simple structure, small footprint, low energy consumption and can be integrated with grinding equipment.

In order to achieve the above purpose, the present invention provides a mill classification device, which is suitable for a horizontal mill. The mill classification device is arranged on the drive shaft of the horizontal mill close to the discharge end, and includes a direction along the material travel direction. A centrifugal disc and a classification rotor are sequentially sleeved on the drive shaft; a cylindrical screen is embedded in the classification rotor, one end of the cylindrical screen is fixedly connected to the end face of the drive shaft, and the circular A discharge hole is opened in the center of the other end of the drum screen, and a discharge pipe is fixedly connected in the discharge hole; a plurality of flow-through holes are opened on both the centrifugal disc and the classification rotor.

In addition, preferably, the grading rotor comprises an annular inner end panel, an outer end panel and a connecting plate group disposed therebetween, the inner diameter of the outer end panel is larger than the inner diameter of the inner end panel, and the A accommodating cavity for accommodating the cylindrical screen is formed between the inner end panel, the outer end panel and the connecting plate group.

In addition, preferably, the connecting plate group includes a plurality of rectangular connecting plates, and the connecting plates are arranged between the inner end panel and the outer end panel at an equal angle in the circumferential direction.

In addition, preferably, the included angle between two adjacent connecting plates is 30°˜45°.

Furthermore, preferably, the discharge pipe and the drive shaft are located on the same axis.

In addition, preferably, the wall thickness of the discharge pipe is 60mm˜100mm.

In addition, preferably, the two end faces and the side faces of the cylindrical screen are evenly provided with a plurality of screen holes.

In addition, preferably, the aperture of the sieve hole is 0.1 mm˜0.2 mm.

In addition, preferably, the diameter of the flow hole is 80mm˜120mm.

In addition, preferably, the distance between the centrifugal disc and the classification rotor and the inner wall of the casing is 40mm˜60mm.

It can be known from the above description and practice that the mill classification device of the present invention changes the traditional grinding mill by setting a centrifugal disc, a classification rotor, a cylindrical screen and a discharge pipe in the discharge section of the traditional horizontal mill. After grinding, the equipment also needs to carry out grading work. The grinding operation and the grading operation can be carried out at the same time, the efficiency of the grinding operation is improved, and the energy consumption of the grinding operation is reduced to a certain extent. In addition, the mill classification device can realize secondary classification, and the particle size of the final output material can reach the ultra-fine level, which improves the qualification rate of mineral powder.

Description of drawings

FIG. 1 is a schematic structural diagram of a mill classification device according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a centrifugal disk according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional structure diagram of a classification rotor according to an embodiment of the present invention.

FIG. 4 is a schematic side view of the structure of a classification rotor according to an embodiment of the present invention.

In the picture:

1. Shell;

2. Drive shaft;

3. Grinding disc;

4. Centrifugal disc;

5. Grading rotor, 51, inner end panel, 52, connecting plate group, 521, connecting plate, 53, outer end panel;

6. Cylindrical screen;

7. Discharge pipe;

8. Overflow hole;

9. Bearings.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Exemplary embodiments, however, can be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of exemplary embodiments conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated descriptions will be omitted. It should be noted that, in the present disclosure, the terms "comprising", "configured with", and "disposed on" are used to indicate an open-ended inclusive meaning, and refer to elements/components/etc. other than the listed elements/components/etc. Additional elements/components/etc. may also be present; terms "first", "second", etc. are used only as labels and not as limitations on the number or order of their objects; terms "center", "upper", "lower" , "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing this The invention and simplified description do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In an exemplary embodiment of the present disclosure, a mill classification device is provided, which is applied to a horizontal mill. FIG. 1 is a schematic structural diagram of a mill classification device according to an embodiment of the present invention. FIG. 2 is a schematic side view of a centrifugal disk according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional structure diagram of a classification rotor according to an embodiment of the present invention. FIG. 4 is a schematic side view of the structure of a classification rotor according to an embodiment of the present invention. Among them, Figure 1 shows a schematic structural diagram of the discharge section of a horizontal mill, in which the mill classification device described in this embodiment is installed.

Please refer to FIGS. 1 to 4 , the mill classification device in this embodiment is arranged in the discharge section of the horizontal mill, and FIG. 1 shows the structure of the discharge section of the horizontal mill. The horizontal mill includes A cylindrical casing 1 with both ends closed, a drive shaft 2 arranged in the center of the casing 1, and a plurality of grinding discs 3 sleeved on the drive shaft 2 at equal intervals. The drive shaft 2 is driven by a drive device disposed at one end of the casing 1 close to the feeding port, and drives the grinding disc 3 on the drive shaft 2 to rotate.

The mill classification device in this embodiment mainly includes a centrifugal disc 4 , a classification rotor 5 , a cylindrical screen 6 and a discharge pipe 7 . The centrifugal disc 4 and the grading rotor 5 are sequentially sleeved on the drive shaft 2 along the direction in which the materials in the mill travel. Preferably, the distance between the centrifugal disc 4 and the grinding disc 3 is equal to the distance between the two adjacent grinding discs 3; the distance between the classification rotor 5 and the centrifugal disc 4 is equal to half of the distance between the two adjacent grinding discs 3, and the The cavity is called the centrifugal classification cavity. In this embodiment, the structures of the grinding disc 3 and the centrifugal disc 4 are the same. As shown in FIG. 2 , there are four flow-through holes 8 evenly distributed along the circumference of the disc surface, and the diameter of the flow-through holes 8 should be between 80 mm and Within the range of 120 mm, in this embodiment, the diameter of the flow hole 8 is 90 mm.

When the material passes through the grinding disc 3 and the flow hole 8 of the centrifugal disc 4 in the mill to reach the centrifugal classification chamber, because the distance between the centrifugal disc 4 and the classification rotor 5 is smaller than that between the centrifugal disc 4 and the grinding disc 3 Therefore, the linear velocity of the material in the centrifugal classification chamber will increase, so as to realize the centrifugal movement of the grinding medium and the coarse and heavy particle materials from the center to the edge in the centrifugal classification chamber, and the coarse particle material and the grinding medium from the centrifugal The gap between the disc 4 and the shell 1 is transported to the grinding disc 3 for further grinding, and this process realizes the primary classification of the material.

As shown in FIGS. 3 and 4 , the classification rotor 5 is composed of an inner end panel 51 , a connecting plate group 52 and an outer end panel 53 . The inner end panel 51 and the outer end panel 53 are annular circular plates with the same outer diameter, wherein the inner end panel 51 is sleeved on the end of the drive shaft 2 . The connecting plate group 52 is arranged between the inner end panel 51 and the outer end panel 53, and is composed of a number of rectangular connecting plates 521 distributed equiangularly along the circumferential direction. The end panels 53 are fixedly connected. The inner diameter of the outer end panel 53 is larger than the inner diameter of the inner end panel 51, and the width of the connecting plate 521 does not exceed the width of the outer end panel 53, so that a cylindrical accommodating cavity is formed in the middle of the classification rotor 5, and the drive shaft 2 is close to the discharge The end face of the end is located in the accommodating cavity. In addition, the angle between two adjacent connecting plates 521 should be between 30° and 45°, and in this embodiment, the angle between the two is 30°, that is, the inner end panel 51 and the outer end panel 53 share a total of 30°. Twelve connection boards 521 are provided. A regrind return channel is formed between two adjacent connecting plates 521 .

The cylindrical screen 6 is a hollow cylinder, which is embedded in the accommodating cavity in the middle of the classification rotor 5 . The two end faces and the side faces of the cylindrical sieve 6 are evenly distributed with a number of sieve holes with an aperture of 0.1 mm to 0.2 mm. In addition, one end face of the cylindrical screen 6 is fixedly connected with the end face of the drive shaft 2 near the discharge end, the other end face of the cylindrical screen 6 is provided with a discharge hole 61 in the center, and a discharge pipe 7 is fixedly connected in the discharge hole 61 . Preferably, the cylindrical screen 6 and the discharge pipe 7 are integrally cast. It should be noted that a gap of 10mm to 15mm is left between the cylindrical screen 6 and the inner end panel 51 to prevent the material from clogging the cylindrical screen, and at the same time, it is also convenient for the larger particle material to enter the regrinding return channel, and then pass through the classification rotor 5. , The gap between the centrifugal disc 4 and the grinding disc 3 and the shell 1 reaches the grinding disc for further grinding.

The discharge pipe 7 is rotatably connected with the end face of the housing 1 through the bearing 9 , and the discharge pipe 7 and the drive shaft 2 are located on the same axis. The discharge pipe 7 has formed an integral structure with the drive shaft 2 through the cylindrical screen 6, so the two ends of the drive shaft 2 can be directly or indirectly connected to the housing 1 for rotation. The wall thickness of the discharge pipe 7 should be between 60mm and 100mm to ensure that it has sufficient strength to avoid deformation and damage during the rotation process. In this embodiment, the wall thickness of the discharge pipe 7 is 80 mm.

In addition, in this embodiment, the outer diameters of the grinding disc 3 , the centrifugal disc 4 , the inner end panel 51 and the outer end panel 53 are the same, and the distance from the inner wall of the casing 1 is in the range of 40mm˜60mm.

During use, the material to be finely ground is first hit by the grinding medium between several grinding discs 3 in the casing 1 and ground into finer particles, and as the material travels forward in the casing 1, it reaches the centrifugal classification Since the distance between the centrifugal disc 4 and the classification rotor 5 is smaller than the distance between the centrifugal disc 4 and the grinding disc 3, the linear velocity of the material in the centrifugal classification cavity will increase, thereby realizing the grinding medium and coarse weight. The granular material moves centrifugally from the center to the edge in the classification chamber, and the coarse-grained material and the grinding medium are transported from the gap between the centrifugal disc 4 and the shell 1 to the grinding disc 3 for further grinding. This process realizes the material a classification. Then, the finer granular materials in the middle of the centrifugal classification chamber enter between the accommodating chamber of the classification rotor 5 and the cylindrical screen 6 through the flow hole 8 on the inner end panel 51 for secondary classification, that is, screening and classification. The material whose particle size is smaller than the sieve hole of the cylindrical sieve 6 enters the cylindrical sieve 6 and is output through the discharge pipe 7; The gap between the classification rotor 5, the centrifugal disc 4 and the grinding disc 3 and the casing 1 reaches the grinding disc 3 for further grinding.

The mill classification device in this embodiment can be integrated with a traditional horizontal mill, thereby reducing the floor space occupied by the conventional mill and classification equipment. At the same time, the mill classification device and the horizontal mill can share the same drive device, which reduces the energy consumption of grinding to a certain extent. In addition, the mill classification device can re-transport materials that do not meet the particle size requirements to the horizontal mill for further grinding, making the entire grinding process smoother and improving the efficiency of grinding operations.

Other embodiments of the present disclosure will readily suggest themselves to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or techniques in the technical field not disclosed by the present disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the claims.

Claims (10)

1. A mill grading device is suitable for a horizontal mill, and is characterized in that the mill grading device is arranged on a driving shaft of the horizontal mill close to a discharge end and comprises a centrifugal disc and a grading rotor which are sequentially sleeved on the driving shaft along the material advancing direction; a cylindrical screen is embedded in the grading rotor, one end of the cylindrical screen is fixedly connected with the end face of the driving shaft, a discharge hole is formed in the center of the other end of the cylindrical screen, and a discharge pipe is fixedly connected in the discharge hole; and a plurality of overflowing holes are formed in the centrifugal disc and the grading rotor.

2. A mill grading device according to claim 1, wherein the grading rotor comprises annular inner and outer end face plates and a set of connecting plates disposed therebetween, the outer end face plate having an inner diameter greater than the inner diameter of the inner end face plate, the inner and outer end face plates and the set of connecting plates defining a receiving cavity therebetween for receiving the cylindrical screen.

3. A mill grading device according to claim 2, wherein said set of connection plates comprises a plurality of rectangular connection plates arranged circumferentially equiangularly between said inner and outer end plates.

4. A mill classifying device according to claim 3, wherein the angle between adjacent two of said connecting plates is from 30 ° to 45 °.

5. The mill classification apparatus of claim 1, wherein the discharge conduit is located on the same axis as the drive shaft.

6. A mill grading device according to claim 5, wherein the wall thickness of the discharge conduit is from 60mm to 100 mm.

7. A mill classifier as claimed in claim 1 wherein the cylindrical screen is provided with a plurality of screen openings on both end faces and on the side faces.

8. A mill classifier as claimed in claim 7 in which the apertures of the screen holes are in the range 0.1mm to 0.2 mm.

9. A mill classification apparatus as claimed in any one of claims 1 to 8, characterised in that the diameter of the flowthrough holes is in the range 80mm to 120 mm.

10. A mill classifying device according to any one of claims 1 to 8, wherein the distance between the centrifugal disc and the classifying rotor and the inner wall of the housing is 40mm to 60 mm.

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