A ball mill feed end assist

Abstract

The utility model belongs to the field of ore dressing relates to a ball mill feed end auxiliary device, including the ore chute, is located the ball mill feed end and the feeding bushing junction below, the bottom of ore chute is inclined setting, the end of ore chute is equipped with the discharge gate, the discharge gate is connected to the pump pool of ball mill through the pipeline, one side of ore chute in the highest position is equipped with the water inlet of supplement. The technical scheme of the present application realizes the effective recovery of the leakage of the slurry through the ore chute system, avoids the direct leakage of the slurry to the ground, eliminates the hidden danger and the environmental pollution.

Description

Technical Field

[0001] This utility model belongs to the field of mineral processing and relates to an auxiliary device for the feed end of a ball mill. Background Technology

[0002] Ball mills, as key industrial equipment for material grinding, fine processing, or mixing, are widely used in industries such as cement, silicate products, metal ore beneficiation, and glass ceramics. Their stable operation is crucial for the continuous operation of production lines. In the feeding system of ball mills, traditional designs generally adopt a feeding structure that combines a static feed bend with a dynamic feed bushing (a feed end bushing that rotates synchronously with the ball mill cylinder). The feed bend is installed as a fixed component outside the ball mill feed end to receive and guide external materials into the mill; the feed bushing rotates with the mill cylinder, and the two form a dynamic seal connection through a sealing device to achieve sealing protection during material conveying.

[0003] However, the existing sealing structure exhibits significant technical defects after long-term operation: due to the relative movement between the feed bend (static) and the feed bushing (dynamic), and the fact that the sealing interface must simultaneously withstand multiple influences such as high-frequency vibrations generated by the mill operation, material scouring (including the embedding of hard particles), and axial / radial combined mechanical stress, the sealing mating surfaces (especially the contact area between the feed bend and the feed end bushing) are prone to uneven wear, leading to the gradual formation of grooves, gaps, or localized damage on the sealing surface. As wear accumulates, the gap between the dynamic and static components continues to widen, and the high-pressure slurry (containing solid particles) inside the mill breaks through the sealing interface under pressure, leaking outward from the gap, resulting in the phenomenon of "slurry leakage at the feed end."

[0004] Such slurry leakage problems can cause multiple negative effects: First, slurry leakage directly threatens the safety of equipment operation (e.g., slurry seepage may corrode surrounding bearing seats, lubrication systems and other key components), and increases the difficulty of on-site management (e.g., environmental pollution in the work area, frequent cleaning operations); Second, operators need to continuously monitor the slurry leakage and deal with leaked materials, which significantly increases labor intensity; Third, if the slurry leakage problem is not dealt with in time, the gap will further expand, leading to an abnormal increase in the mill's discharge rate (leaked slurry enters the discharge system through the exhaust channel), ultimately forcing the production line to shut down for maintenance—at which point it is usually necessary to replace the worn feed bend (because its outer sealing surface is severely worn and has lost its sealing function).

[0005] Furthermore, existing technical solutions have significant economic and resource waste issues: on the one hand, the feed bend is a key component with a high price, and the replacement process requires downtime and has a long cycle (especially in mining enterprises, where frequent replacements will directly lead to production interruptions if there is no backup equipment, and may even affect the entire monthly production plan); on the other hand, in actual use, it has been found that although the outer sealing surface of the feed bend needs to be replaced due to wear, its internal structure (such as the main load-bearing part) often still has a large margin that can continue to be used. Directly replacing the whole thing will cause significant resource waste and increased costs.

[0006] It is worth noting that as the mining industry demands higher grinding efficiency, the application of ceramic balls (which combine high hardness and low wear characteristics) is gradually being promoted. To ensure the grinding effect of ceramic balls, ball mills need to adopt a higher filling rate (such as 35%-40% when ceramic balls and steel balls are used together). However, a high filling rate will further exacerbate the problem of slurry leakage at the feed end. For example, in a certain mining company, the second-stage mill uses a mixture of ceramic balls and steel balls (filling rate of about 35%-40%), and the newly replaced feed bend experienced slurry leakage after only about half a month of operation, which seriously restricted the continuity and stability of production and urgently requires targeted improvement.

[0007] In summary, the existing sealing structure between the static feed bend and the dynamic feed bushing has problems such as easy wear, frequent slurry leakage, high maintenance costs and waste of resources. These problems are particularly prominent under the condition of high ceramic ball filling rate, and have become a key technical bottleneck affecting the long-term stable operation of ball mills. Summary of the Invention

[0008] This application provides an auxiliary device for the feed end of a ball mill, which effectively recovers leaked slurry through a slurry receiving chute system, preventing the slurry from leaking directly to the ground and eliminating safety hazards and environmental pollution.

[0009] To achieve the above technical objectives, the technical solution adopted in this application is an auxiliary device for the feed end of a ball mill, arranged at the connection between the feed bend and the feed bushing; it includes a receiving chute located below the connection between the feed bend and the feed bushing; the bottom of the receiving chute is inclined; the end of the receiving chute is provided with a discharge port, which is connected to the pump pool of the ball mill through a pipeline; and a water inlet is provided on the side of the receiving chute at its highest position.

[0010] As an improved technical solution of this application, the bottom of the ore receiving chute has a slope of not less than 10%.

[0011] As an improved technical solution of this application, the receiving chute is provided with a diversion plate; there are two sets of diversion plates, which are symmetrically arranged along the center line of the receiving chute, and have a first opening width at a higher position in the receiving chute and a second opening width at the discharge port of the receiving chute. The first opening width is greater than the second opening width, that is, the two sets of diversion plates form a tapering structure that is wider at the top and narrower at the bottom; the higher position refers to the position above the water-blocking ring.

[0012] As an improved technical solution of this application, the diversion plate is formed by the gradually tapering and inclined sides of the ore receiving chute, forming a diversion channel that is wider at the top and narrower at the bottom.

[0013] As an improved technical solution of this application, it also includes a water-blocking ring, which is fixed to the outer wall of the feed cylinder and located at the end of the feed cylinder where the feed bend and the feed bushing are connected; wherein, the feed bushing is located inside the feed cylinder. Beneficial effects

[0014] 1. Completely solve the problem of slurry leakage: The slurry leakage is effectively recovered through the ore receiving chute system, which prevents the slurry from leaking directly to the ground, eliminating safety hazards and environmental pollution.

[0015] 2. Improve equipment uptime: Based on the technical means of coordinated flow guidance and closed-loop recycling of ore receiving chute and diversion plate, the slurry leakage problem is alleviated, the number of downtime maintenance caused by slurry leakage is reduced, and the continuous operation capability of ball mill is greatly improved.

[0016] 3. Reduced maintenance costs: Based on the technology of closed-loop slurry leakage recovery and extended service life of the feed bend, although the sealing structure may still wear, it no longer needs to be replaced frequently, which significantly extends its service life and saves spare parts costs.

[0017] 4. Improve resource utilization: The leaked slurry is returned to the pump pool through a closed-loop circulation system, achieving efficient resource utilization and avoiding waste.

[0018] 5. Improve the working environment and safety management: reduce the accumulation of slurry on site and improve site cleanliness.

[0019] 6. High adaptability: It is particularly suitable for applications of new grinding media such as high filling rate and ceramic balls, and has a wide range of applicability and promotion prospects.

[0020] 7. Low modification cost and short construction period: No large-scale modification of the original equipment structure is required, construction is simple, and it is easy to promote and apply. Attached Figure Description

[0021] Figure 1 A side perspective structural diagram of the device of this application is shown; Figure 2A three-dimensional structural schematic diagram of the device of this application is shown; Figure 3 A schematic diagram of the connection structure of the ore receiving chute from the first angle; Figure 4 A second-angle schematic diagram of the connection structure of the ore receiving chute; In the diagram, 1 is the feed bend; 2 is the feed bend sealing device; 3 is the feed bushing; 4 is the feed cylinder; 5 is the ore receiving chute; 6 is the water inlet; 7 is the discharge outlet; and 8 is the water baffle. Detailed Implementation

[0022] The feed end of a ball mill consists of a stationary feed bend and a rotating feed cylinder, and a sealing structure is required between them to prevent material leakage. Currently, YX-type sealing rings are commonly used. However, due to harsh working environments (such as high filling rates, installation errors, vibration, and impact), YX sealing rings have poor wear resistance and unstable sealing performance, making them prone to wear and failure, leading to slurry leakage. Once leakage occurs, it not only pollutes the site environment and affects operational safety, but also requires frequent shutdowns for cleaning and maintenance, severely impacting the ball mill's continuous operation capacity and production efficiency.

[0023] This application adds a receiving chute 5 to the feed end of the ball mill. The receiving chute 5 is inclined with a slope of no less than 10%. The inner side of the receiving chute 5 extends to the lower part of the ball mill's feed cylinder 4 and is securely fixed with supports. The receiving chute 5 has a water inlet 6 at its highest point and a discharge outlet 7 at its lowest point. The discharge outlet 7 is connected to the corresponding pump pool of the ball mill via a pipeline, enabling closed-loop recycling of leaked slurry. Simultaneously, multiple guide plates are welded to the inner wall of the ball mill's feed cylinder 4. These guide plates are arranged in a gradually narrowing pattern, wider at the top and narrower at the bottom, to effectively guide the discharged ore into the receiving chute 5 quickly. Through these modifications, the problem of ore discharge at the ball mill's feed end is fundamentally solved, significantly improving equipment operating rate, greatly reducing maintenance frequency and costs, improving the on-site working environment, and reducing the labor intensity of operators. At the same time, it avoids safety hazards caused by slurry leakage cleaning, ensuring operational safety. The upgraded system operates stably and reliably, without causing any adverse effects on the normal operation of the original equipment, effectively ensuring the safety of equipment operation and the continuity of production.

[0024] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings.

[0025] like Figure 1-4 The auxiliary device at the feed end of the ball mill shown is arranged at the connection between the feed bend 1 and the feed bushing 3; the feed bushing 3 is located inside the feed cylinder 4 of the ball mill; the feed bend 1 extends into the feed cylinder 4 and connects to the feed bushing 3, and a feed bend sealing device 2 is provided at one end of the feed bend 1 located in the feed bushing 3.

[0026] An auxiliary device for the feed end of a ball mill includes a receiving chute 5.

[0027] The receiving chute 5 is located below the connection between the feed bend 1 and the feed bushing 3 to receive the material leakage from the feed end of the ball mill.

[0028] The bottom of the receiving sluice 5 is inclined; a discharge port 7 is provided at the end (lowest side) of the receiving sluice 5, and the discharge port 7 is connected to the pump pool of the ball mill through a pipe to recover leaked material. In some embodiments, in order to ensure that the slurry leaking or being discharged from the feed end of the ball mill can flow smoothly without accumulation or blockage, the receiving sluice 5 must have a sufficient slope. Setting the bottom of the receiving sluice 5 to have a slope of not less than 10% can effectively increase the flow velocity of the slurry in the sluice; the receiving sluice 5 extends into the lower part of the feed cylinder 4, and is reasonably arranged to maximize the recovery of leaked slurry.

[0029] Furthermore, to prevent blockage, the ore receiving chute 5 is provided with a water inlet 6 on the side at the highest position, which is also called the inlet end, i.e. the end that receives the leaked material.

[0030] Due to the poor fluidity of the leaked slurry and its tendency to disperse and stagnate within the sluice, the receiving sluice 5 is equipped with two sets of diversion plates. These two sets of diversion plates are symmetrically arranged along the centerline of the receiving sluice, and each set has a first opening width at a higher position (above the water-blocking ring 8) and a second opening width at the discharge port 7. The first opening width is greater than the second opening width, forming a tapering structure that is wider at the top and narrower at the bottom. Specifically, the diversion plates are positioned at the inlet of the receiving sluice, directly facing the slurry outlet direction of the ball mill feed end, and are symmetrically arranged along the transverse centerline of the sluice. The upstream opening width is greater than the downstream opening width, used to concentrate and guide the dispersed slurry flowing towards the discharge direction. The tapering structure of the diversion plates, wider at the top and narrower at the bottom, facilitates faster slurry flow under the flushing action of added water, improving discharge efficiency.

[0031] In some embodiments, such as Figure 3-4 As shown, the diversion plate is composed of a gradually tapering inclined structure on both sides of the inner wall of the ore receiving chute 5, forming a diversion channel that is wider at the top and narrower at the bottom.

[0032] The water-blocking ring 8 is fixed to the outer wall of the feed cylinder 4 and located at the end of the feed cylinder 4 where the feed bend 1 connects to the feed bushing 3; the feed bushing 3 is located inside the feed cylinder 4. Its main function is to block the slurry leaking from the gap between the feed bend 1 and the feed cylinder 4, preventing the slurry from flowing along the outer wall of the equipment into the hollow shaft area of ​​the ball mill, avoiding contamination and corrosion of the hollow shaft surface, foundation, and lubrication system, thereby protecting key transmission components and ensuring the safe and stable operation of the equipment.

[0033] The operation process is as follows: when slurry leakage occurs during ball mill operation due to seal wear or other reasons, the slurry will flow out from the feed end of the feed cylinder 4; the receiving chute 5 is designed with a diversion plate to ensure rapid slurry flow and avoid accumulation and blockage; a water inlet 6 is provided on the receiving chute 5, which can add an appropriate amount of flushing water as needed to maintain slurry fluidity; a discharge port 7 is provided at the end of the receiving chute 5, which is connected to the ball mill's own pump pool through a pipeline; after the slurry flows into the pump pool through the discharge port 7, it can be pumped back to the ball mill by the slurry pump, forming a closed-loop circulation system. Through the above method, even if there is a certain degree of slurry leakage, it can be recovered in time, avoiding environmental pollution and resource waste, while ensuring equipment operation safety and reducing the frequency of manual intervention.

Claims

1. An auxiliary device for the feed end of a ball mill, arranged at the connection between the feed bend and the feed bushing; characterized in that, It includes a receiving sluice, located below the connection between the feed bend and the feed bushing; the bottom of the receiving sluice is inclined; the end of the receiving sluice is provided with a discharge port, which is connected to the pump pool of the ball mill through a pipeline; the receiving sluice is provided with a water replenishment port on the side at the highest position.

2. The auxiliary device for the feed end of a ball mill according to claim 1, characterized in that, The bottom of the ore receiving chute has a slope of not less than 10%.

3. The auxiliary device for the feed end of a ball mill according to claim 1, characterized in that, The ore receiving chute is equipped with a diversion plate; there are two sets of diversion plates, which are symmetrically arranged along the center line of the ore receiving chute, and have a first opening width at a higher position in the ore receiving chute and a second opening width at the discharge port of the ore receiving chute. The first opening width is greater than the second opening width, that is, the two sets of diversion plates form a tapering structure that is wider at the top and narrower at the bottom; the higher position refers to the position above the water-blocking ring.

4. The auxiliary device for the feed end of a ball mill according to claim 3, characterized in that, The diversion plate is formed by the gradually tapering and inclined sides of the ore receiving chute, creating a diversion channel that is wider at the top and narrower at the bottom.

5. The auxiliary device for the feed end of a ball mill according to claim 1, characterized in that, It also includes a water-blocking ring, which is fixed to the outer wall of the feed cylinder and located at the end of the feed cylinder where the feed bend connects to the feed bushing; wherein the feed bushing is located inside the feed cylinder.

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