A ball mill discharge grate and ball mill discharge arrangement

Abstract

The utility model provides a kind of ball mill discharge grating and ball mill discharge device, belong to ball mill accessory technical field. Including first discharge grating, second discharge grating, first frame and second frame, first discharge grating is set on first frame, multiple first frame constitutes circular frame, second frame is set in the middle of circular frame, second discharge grating is set on second frame, and second discharge grating is spaced apart with first frame along axial direction, multiple discharge holes are set on first discharge grating and second discharge grating. By increasing second discharge grating, on the basis of first discharge grating, increase ventilation area, and second discharge grating is set on cylindrical second frame, and the structure of outer convex can help the grinding body in discharge bin to throw material, so that the ground material is more commonly passed through discharge hole, and the discharge speed is improved.

Description

Technical Field

[0001] A discharge grate and discharge device for a ball mill belong to the technical field of ball mill accessories. Background Technology

[0002] The working principle of a ball mill is to crush and grind materials through the movement of grinding media (such as steel balls, steel forgings, steel rods, etc.) inside the cylinder. A ball mill mainly consists of a horizontally placed rotating cylinder, supported by two large bearings and divided into several chambers by partition plates. The structure of the discharge grate installed in the discharge chamber plays a crucial role in the discharge speed of the ground material and the ventilation effect.

[0003] The existing ball mills have small ventilation areas in their discharge grate plates, which seriously affects the internal ventilation effect and the speed at which materials pass through. In addition, there is usually a certain gap between the discharge grate plate and the discharge port of the ball mill. The material coming out of the discharge port of the discharge grate plate will stick to the discharge end wall of the gap due to electrostatic adsorption or moisture absorption, which will hinder the passage of materials. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a ball mill discharge grate and ball mill discharge device that increases ventilation area and improves discharge speed.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: the discharge grate of the ball mill includes a first discharge grate, a second discharge grate, a first frame, and a second frame. The first discharge grate is disposed on the first frame, and multiple first frames form a circular frame. The second frame is disposed in the middle of the circular frame, and the second discharge grate is disposed on the second frame. The second discharge grate and the first frame are spaced apart along the axial direction. Multiple discharge holes are provided on the first discharge grate and the second discharge grate.

[0006] Preferably, the second discharge grate is spaced 190-210mm apart from the first frame along the axial direction.

[0007] Preferably, a second discharge hole is provided on the second discharge grate plate, and multiple rows of the second discharge holes are arranged in the horizontal direction, with multiple holes in each row.

[0008] Preferably, a pressure plate is also provided, and the first discharge grate is disposed between the first frame and the pressure plate.

[0009] A ball mill discharge device includes a mill body and an anti-wall-hanging device. A discharge grate is installed at the discharge port of the mill body, a second discharge grate is disposed inside the first discharge grate, and the anti-wall-hanging device is disposed between the first discharge grate and the mill body.

[0010] Preferably, the anti-wall-hanging device includes a rotating shaft, a rotating ring, and a swing plate. The two ends of the rotating shaft are respectively connected to the first discharge grate and the mill body. The rotating ring is rotatably mounted on the rotating shaft, and the swing plate is connected to the rotating ring.

[0011] Preferably, several anti-stubble devices are provided along the circumference of the circular frame.

[0012] Compared with existing technologies, the beneficial effects of this technical solution are: This invention increases the ventilation area by adding a second discharge grate to the first discharge grate. The second discharge grate is set on a cylindrical second frame, and its convex structure helps the grinding media in the discharge chamber to throw the material out, allowing the ground material to pass through the discharge hole more easily and improving the discharge speed. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the discharge grate of a ball mill according to the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of the first discharge grate and the first frame of this utility model.

[0015] Figure 3 This is a cross-sectional view of the first frame, the first discharge grate, and the pressure plate.

[0016] Figure 4 This is a cross-sectional view of a ball mill discharge device.

[0017] Among them: 1. First discharge grate plate; 2. Second discharge grate plate; 3. First frame; 4. Second frame; 5. First discharge hole; 6. Pressure plate; 7. Mill body; 8. Rotary shaft; 9. Rotary ring; 10. Throwing plate; 11. Second discharge hole. Detailed Implementation

[0018] Figures 1-4 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-4 The present invention will be further described below.

[0019] Reference Figure 1 The discharge grate includes a first discharge grate 1, a second discharge grate 2, a first frame 3, and a second frame 4. The fan-shaped first discharge grate 1 is disposed on the fan-shaped first frame 3, and the circular second discharge grate 2 is disposed on the cylindrical second frame 4. The second frame 4 is disposed in the middle of the circle formed by multiple first frames 3. Multiple discharge holes are provided on the first discharge grate 1 and the second discharge grate 2. The ground material is discharged from the discharge ports on the first discharge grate 1 and the second discharge grate 2.

[0020] Specifically, refer to Figures 2-3The first frame 3 is fan-shaped, with layers of discharge ventilation spaces in the middle. The discharge ventilation spaces gradually increase from bottom to top. The first discharge grate 1, which is also fan-shaped, is located in the middle of the first frame 3, blocking the discharge ventilation spaces of each layer, so that the material comes out from the first discharge hole 5. The area of ​​the first discharge grate 1 is smaller than the area of ​​the first frame 3, and it is fixed to the frame of the first frame 3 by countersunk bolts.

[0021] In this embodiment, a certain gap is left between two adjacent first discharge grate plates 1. A long strip-shaped pressure plate 6 is set to fix the sides of the two adjacent first discharge grate plates 1. Bolt holes are set at the same position on the pressure plate 6 and the adjacent first frame 3. A circular anti-wear recess is set on the side of the pressure plate 6 away from the first discharge grate plate 1. The countersunk bolts that fix the first discharge grate plate 1 are set in the bolt holes. The anti-wear recess on the pressure plate 6 can effectively prevent the nuts from being worn.

[0022] The first discharge grate 1 is provided with a first discharge hole 5, which is wedge-shaped and 4mm wide. The grate is directly cut from a 6mm thick manganese steel plate, which can effectively prevent grinding media from entering and clogging the grate. The first discharge hole 5 is arranged in 10 rows, which are densely distributed to enable materials to pass through quickly.

[0023] In this embodiment, both the first frame 3 and the first discharge grate 1 are provided with 16 pieces, forming a ring-shaped discharge grate. The fan-shaped arrangement of the discharge grate not only reduces the weight by more than 20% compared to the traditional integral cast grate, but also realizes the easy loading and unloading function of the grate.

[0024] At the middle position of the annular discharge grate formed by the first discharge grate 1, a second discharge grate 2 and a second frame 4 protrude into the grinding chamber. The second frame 4 has a hollow center and protrudes 200mm into the chamber. The circular second discharge grate 2 is located at the end of the second frame 4. The second frame 4 is fixed to the first frame 3 by bolts.

[0025] The second discharge grate 2 is provided with a second discharge hole 11. The second discharge holes 11 are arranged in multiple rows along the horizontal direction, with multiple holes in each row, densely distributed to maximize ventilation and discharge area. In addition, the protruding structure into the silo can receive the material thrown by the grinding mill tail along with the grinding media, effectively selecting the finished cement from the grinding mill tail and reducing over-grinding of cement.

[0026] Reference Figure 4The ball mill discharge device using this discharge grate includes a mill body 7 and an anti-wall-hanging device. An anti-wall-hanging device is provided at the discharge end of the discharge grate. The anti-wall-hanging device is located between the first discharge grate 1 and the mill body 7 and includes a rotating shaft 8, a rotating ring 9, and a swing plate 10. The rotating shaft 8 is fixed between the first discharge grate 1 and the mill body 7 by bolts. Eight of them are arranged along the circumference formed by the first discharge grate 1. The rotating ring 9 is rotatably mounted on the rotating shaft 8 and connected to the swing plate 10. The swing plate 10 is a rectangular thin sheet made of 150mm*30mm*10mm manganese steel plate. The anti-wall-hanging device can rotate with the rotation of the ball mill to prevent cement from being stuck on the discharge end wall by electrostatic adsorption or moisture absorption, thus hindering the passage of materials and ensuring smooth discharge.

[0027] Work process: The material is ground in the hopper, and the ground material enters the discharge port of the ball mill through the discharge ports on the first discharge grate 1 and the second discharge grate 2. The anti-wall-hanging device prevents the material from hanging on the discharge end wall, effectively increasing the discharge rate.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A discharge grate for a ball mill, characterized in that: It includes a first discharge grate (1), a second discharge grate (2), a first frame (3), and a second frame (4). The first discharge grate (1) is set on the first frame (3), and multiple first frames (3) form a circular frame. The second frame (4) is set in the middle of the circular frame. The second discharge grate (2) is set on the second frame (4), and the second discharge grate (2) and the first frame (3) are spaced apart along the axial direction. Multiple discharge holes are provided on the first discharge grate (1) and the second discharge grate (2).

2. The discharge grate of a ball mill according to claim 1, characterized in that: The second discharge grate (2) and the first frame (3) are spaced 190-210 mm apart along the axial direction.

3. The discharge grate of a ball mill according to claim 1, characterized in that: The second discharge grate (2) is provided with a second discharge hole (11), and the second discharge hole (11) is arranged in multiple rows along the horizontal direction, with multiple holes in each row.

4. The discharge grate of a ball mill according to claim 1, characterized in that: It is also equipped with a pressure plate (6), and the first discharge grate (1) is set between the first frame (3) and the pressure plate (6).

5. A ball mill discharge device using the discharge grate of the ball mill according to any one of claims 1 to 4, characterized in that: The mill body (7) includes a mill body (7) and an anti-wall-hanging device. The discharge grate is installed at the discharge port of the mill body (7), the second discharge grate (2) is set inside the first discharge grate (1), and the anti-wall-hanging device is set between the first discharge grate (1) and the mill body (7).

6. A ball mill discharge device according to claim 5, characterized in that: The anti-wall-hanging device includes a rotating shaft (8), a rotating ring (9), and a sling plate (10). The two ends of the rotating shaft (8) are respectively connected to the first discharge grate plate (1) and the mill body (7). The rotating ring (9) is rotatably mounted on the rotating shaft (8), and the sling plate (10) is connected to the rotating ring (9).

7. A ball mill discharge device according to claim 5, characterized in that: The aforementioned anti-wall-hanging device is provided in several units along the circumference of the circular frame.

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