Ball mill feed section seal

Abstract

The utility model relates to a ball mill feeding part sealing device, relates to ball mill technical field, it includes fixed feeding elbow pipe and with ball mill synchronous rotation's horizontal feed pipe, one end of feeding elbow pipe inserts in feed pipe, and the outer periphery of the inserted end of feeding elbow pipe is equipped with flange, the outer periphery of flange is equipped with annular sealing seat, sealing seat is tightly connected with the pipe orifice of feed pipe, and the inner peripheral surface between sealing seat and the outer peripheral surface of flange is provided with the gap for accommodating lubricating oil, and one end of flange is opened and is filled with oil hole, and the oil hole is communicated with the gap through the oil injection channel in the inside of flange, and the inner and outer ends of sealing seat are provided with the inner sealing ring and outer sealing ring for the sealing of gap respectively, and the inner sealing ring and outer sealing ring all are sleeved in the outer wall surface of flange. The utility model can realize long -term stable sealing, is convenient for maintaining, has improved the working reliability and service life of ball mill.

Description

Technical Field

[0001] This utility model relates to the field of ball mill technology, and in particular to a sealing device for the feeding section of a ball mill. Background Technology

[0002] In ball mill equipment, the sealing structure of the feeding section is one of the key components ensuring the normal operation of the entire machine. Since the ball mill feed pipe rotates with the mill body, while the feed bend remains stationary, there is relative movement between the two. Therefore, a reliable sealing device is required at their connection point to prevent dust escape and lubricant leakage. Currently, this type of seal mostly adopts packing seals or mechanical face seals, relying on the compression of packing or sealing rings to achieve sealing between dynamic and static components.

[0003] However, the aforementioned common structures still have certain limitations in actual operation. For example, packing seals are prone to wear, leading to a gradual decline in sealing effectiveness. This necessitates frequent adjustments or replacements of the packing, resulting in high maintenance costs. Furthermore, during long-term operation, grease is easily lost, making it difficult to continuously form an effective lubricating film. Especially during equipment restarts, the original lubricant may dry out or become contaminated, causing dry friction at the sealing interface and accelerating the wear of the sealing elements. In addition, common oil injection channel designs often fail to integrate well with the rotary seal structure, making it difficult for the lubricant to be evenly distributed throughout the entire circumference of the friction pair, which also affects the seal's lifespan and stability. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing device for the feeding section of a ball mill, so as to achieve long-term stable sealing, facilitate maintenance, and thus improve the working reliability and service life of the ball mill.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a sealing device for the feeding section of a ball mill, comprising a fixed feeding bend and a horizontal feed pipe that rotates synchronously with the ball mill. One end of the feeding bend is inserted into the feed pipe. A flange is provided on the outer periphery of the inserted end of the feeding bend. An annular sealing seat is fitted on the outer periphery of the flange. The sealing seat is tightly connected to the opening of the feed pipe. A gap for accommodating lubricating oil is provided between the inner circumferential surface of the sealing seat and the outer circumferential surface of the flange. An oil injection hole is opened at one end of the flange. The oil injection hole is connected to the gap through an oil injection channel inside the flange. An inner sealing ring and an outer sealing ring for sealing the gap are respectively provided at the inner and outer ends of the sealing seat. Both the inner and outer sealing rings are fitted on the outer wall surface of the flange.

[0006] Preferably, the inner wall of the feed pipe opening is provided with a step, and the inner end of the sealing seat presses the inner sealing ring against the step.

[0007] More preferably, the outer end of the sealing seat is detachably connected to a pressure cap, which presses the outer sealing ring against the outer end face of the sealing seat.

[0008] More preferably, the sealing seat is provided with a connecting part on its outer periphery, and the feed pipe is provided with an ear on its outer periphery, and the connecting part and the ear are fastened together by bolts.

[0009] More preferably, the inner wall surface of the feed bend insertion end is funnel-shaped.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. By setting oil injection holes and oil injection channels on the flange, lubricating oil can be periodically added to the gap between the sealing interface, so that a continuous oil film lubrication is formed between the rotating sealing seat and the fixed flange, which greatly reduces the wear of the sealing element and significantly extends the service life of the entire sealing device.

[0012] 2. The inner and outer sealing rings on both sides form an effective sealed chamber, which can reliably prevent internal lubricating oil leakage and prevent external dust from entering, ensuring the reliability and cleanliness of the seal.

[0013] 3. The device has a reasonable structure and is easy to maintain. It only needs to be replenished with grease periodically through the oil injection hole to maintain good working condition, which effectively reduces equipment maintenance costs and downtime, and improves the operational stability and efficiency of the ball mill. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure in the embodiment;

[0015] Figure 2 for Figure 1 An enlarged schematic diagram of the structure at point A in the middle.

[0016] In the picture:

[0017] 1. Feed bend; 2. Feed pipe; 3. Flange; 4. Sealing seat; 5. Oil injection hole; 6. Oil injection channel; 7. Inner sealing ring; 8. Outer sealing ring; 9. Gland; 10. Lubricating oil; 11. Ash outlet. Detailed Implementation

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0019] It should be noted in advance that, in this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "on" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0020] like Figure 1 and Figure 2 As shown, the sealing device of the ball mill feed section includes a fixed feed bend 1 and a horizontal feed pipe 2 that rotates synchronously with the ball mill. One end of the feed bend 1 is inserted into the feed pipe 2. A flange 3 is provided on the outer periphery of the inserted end of the feed bend 1. An annular sealing seat 4 is fitted on the outer periphery of the flange 3. The sealing seat 4 is tightly connected to the opening of the feed pipe 2. A gap for accommodating lubricating oil 10 is provided between the inner peripheral surface of the sealing seat 4 and the outer peripheral surface of the flange 3. An oil injection hole 5 is opened at one end of the flange 3. The oil injection hole 5 is connected to the gap through the oil injection channel 6 inside the flange 3. An inner sealing ring 7 and an outer sealing ring 8 for sealing the gap are respectively provided at the inner and outer ends of the sealing seat 4. Both the inner sealing ring 7 and the outer sealing ring 8 are fitted on the outer wall surface of the flange 3.

[0021] The inner wall of the feed pipe 2 has a step, and the inner end of the sealing seat 4 presses the inner sealing ring 7 against the step. The step on the inner wall of the feed pipe 2 and the inner end of the sealing seat 4 cooperate to firmly press the inner sealing ring 7 in the axially defined position. This not only greatly enhances the sealing reliability of the inner dynamic sealing interface and effectively prevents lubricating oil from leaking inward, but also ensures that the inner sealing ring 7 is stable in position during long-term operation and is not prone to displacement or deformation, thereby improving the durability and operational stability of the entire sealing device.

[0022] Furthermore, a pressure cap 9 is detachably connected to the outer end of the sealing seat 4, which presses the outer sealing ring 8 against the outer end face of the sealing seat 4. The detachable pressure cap 9 allows for convenient adjustment and tight sealing of the outer sealing ring 8. This structure not only ensures that the outer sealing ring 8 receives a stable and uniform clamping force, guaranteeing the long-lasting effectiveness of its outer dynamic sealing surface, effectively isolating external dust and preventing internal grease leakage; but also, its detachable nature greatly facilitates the inspection, replacement, and maintenance of the sealing ring, allowing for operation without disassembling the entire sealing structure, significantly reducing maintenance difficulty, time, and cost.

[0023] In this embodiment, the sealing seat 4 has a connecting part annularly arranged on its outer periphery, and the inlet of the feed pipe 2 has an ear annularly arranged on its outer periphery. The connecting part and the ear are fastened together by bolts. After the connection is completed, a certain gap is maintained between the connecting part and the ear. This is to facilitate subsequent adjustment of the tightness of the inner sealing ring 7. For example, when oil leakage occurs, the inner sealing ring 7 can be further tightened. By reserving an adjustable assembly gap between the connecting part of the sealing seat 4 and the ear of the feed pipe 2, the operator can dynamically tighten the sealing seat 4 by tightening the bolts without disassembling the overall structure, thereby compensating for the wear of the inner sealing ring 7 and adjusting its tightening force in real time. This design significantly improves the convenience and timeliness of seal maintenance, effectively extends the service life of the sealing element, and ensures that the sealing system can be in a reliable working state for a long time.

[0024] In operation, the position of lubricating oil 10 is as follows: Figure 2 As shown, the lubricant 10 can be grease. Grease has high viscosity and adhesion, which allows it to better adhere to the gap surface formed by the rotating sealing seat 4 and the fixed flange 3, and it is not easily thrown out or lost by centrifugal force. This not only forms a stable lubricating film and reduces wear on the friction pair, but it also assists the inner and outer sealing rings to enhance the sealing effect on the gap, further preventing dust intrusion and grease leakage.

[0025] In addition, the inner wall of the insertion end of the feed bend 1 in this embodiment is funnel-shaped, which significantly increases the flow cross-section of the material entering and effectively guides and optimizes the material flow direction. This structure can greatly reduce the resistance and accumulation of material at this point, and to a large extent prevent abnormal wear or jamming of the sealing structure caused by material blockage. At the same time, it improves the feeding efficiency and ensures the continuity and stability of the ball mill feeding process.

[0026] In this embodiment, the bottom of the feed bend 1 is also provided with a slag-punching port 11, which is closed by a cover plate. The center of the slag-punching port 11 and the center of the feed pipe 2 are located on the same axial line. When the feed part is stuck, the cover plate can be opened and a stick or other tool can be inserted into the slag-punching port 11 to poke it, which can easily solve most of the stuck material problems.

[0027] The ball mill feed section sealing device provided in the above embodiment sets a movable sealing seat 4 at the end of the feed pipe 2 that rotates synchronously with the ball mill, so that it forms a lubrication gap with the flange 3 on the fixed feed bend 1. A unique oil injection channel 6 is used to supply grease to the gap to form a lubrication film. At the same time, an inner and outer double sealing ring fixed by an adjustable clamping structure is used to dynamically seal both ends of the lubrication gap. This effectively reduces rotational friction wear while ensuring the long-term reliability of the seal, significantly improving the stability of equipment operation and the convenience of maintenance.

[0028] To facilitate understanding by those skilled in the art of the improvements of this utility model compared to the prior art, some of the accompanying drawings and descriptions of this utility model have been simplified. The above embodiments are preferred implementations of this utility model. In addition, this utility model can be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A sealing device for the feeding section of a ball mill, comprising a fixed feeding bend (1) and a horizontal feed pipe (2) rotating synchronously with the ball mill, wherein one end of the feeding bend (1) is inserted into the feed pipe (2), characterized in that: The feed bend (1) has a flange (3) on the outer periphery of its insertion end. An annular sealing seat (4) is fitted around the outer periphery of the flange (3). The sealing seat (4) is tightly connected to the opening of the feed pipe (2). A gap for accommodating lubricating oil (10) is provided between the inner circumferential surface of the sealing seat (4) and the outer circumferential surface of the flange (3). An oil injection hole (5) is opened at one end of the flange (3). The oil injection hole (5) is connected to the gap through the oil injection channel (6) inside the flange (3). An inner sealing ring (7) and an outer sealing ring (8) for sealing the gap are respectively provided at the inner and outer ends of the sealing seat (4). The inner sealing ring (7) and the outer sealing ring (8) are both fitted on the outer wall surface of the flange (3).

2. The sealing device for the feed section of a ball mill according to claim 1, characterized in that: The inner wall of the feed pipe (2) is provided with a step, and the inner end of the sealing seat (4) presses the inner sealing ring (7) against the step.

3. The sealing device for the feed section of a ball mill according to claim 1, characterized in that: The outer end of the sealing seat (4) is detachably connected to a pressure cap (9), which presses the outer sealing ring (8) against the outer end face of the sealing seat (4).

4. The sealing device for the feed section of a ball mill according to claim 2, characterized in that: The sealing seat (4) is provided with a connecting part on its outer circumference, and the feed pipe (2) is provided with an ear on its outer circumference. The connecting part and the ear are fastened together by bolts.

5. The sealing device for the feed section of a ball mill according to any one of claims 1-4, characterized in that: The inner wall of the insertion end of the feed bend (1) is trumpet-shaped.

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