Feeding sealing device of air bag push type ball mill

Abstract

The utility model belongs to the technical field of ball mill equipment, and particularly relates to an air bag push type ball mill feeding sealing device which comprises a rotary sealing ring fixedly connected with a ball mill barrel, a fixed sealing ring arranged on a ball mill elbow in a sleeving mode and connected with the outer side wall of the elbow, and a feeding pipe. The rotating sealing ring is a bowl-shaped sealing ring with a protruding outer edge and a concave inner edge, the fixed sealing ring is an outwards-protruding bowl-shaped sealing ring which is coaxially arranged towards the concave surface of the movable ring, an inflatable air bag is arranged in a containing space formed by slotting the back working surface of the fixed sealing ring, an air inlet pipe is connected with the inflatable air bag, and a pressure gauge and a valve are arranged on the air inlet pipe. According to the utility model, the replacement period of the feeding seal is prolonged; the operation rate of the ball mill is improved; equipment accidents are avoided; the environment pollution is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of ball mill equipment, and in particular relates to a gasbag propulsion ball mill feed sealing device. Background Technology

[0002] The feeding section of a wet ball mill is an integral part of the equipment. Material and water enter the mill casing through the feeding device to perform the grinding operation. In daily production, slurry leakage at the feed point of a wet ball mill is a common problem. This is mainly because the installation position of the ball mill feed seal is relatively fixed. During installation, the working surfaces of the two sealing rings are in close contact. During ball mill operation, the working surfaces of the sealing rings wear down, creating gaps and causing leakage. Because the installation position of the sealing rings is fixed, axial displacement cannot compensate for the wear of the sealing surface, so the only solution is to stop the ball mill and replace the sealing rings. If the leakage at the feed point is severe, the leaked slurry will affect the continuous operation of the ball mill casing and also impact the environmental hygiene of the plant workshop, requiring frequent manual cleaning. Summary of the Invention

[0003] The purpose of this invention is to manufacture a wet ball mill feed inlet seal, improve upon the defects of the original design, extend the service life of the seal, save spare parts costs, increase equipment operating rate, and increase output.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] This utility model discloses a pneumatic ball mill feed sealing device, comprising a rotating sealing ring fixedly connected to the ball mill cylinder, a fixed sealing ring sleeved on the ball mill bend and connected to the outer wall of the bend, and a feed pipe. The rotating sealing ring is a bowl-shaped sealing ring with an outer protruding edge and an inner recessed edge, and the fixed sealing ring is a convex bowl-shaped sealing ring coaxially arranged towards the inner recessed surface of the moving ring.

[0006] An inflatable airbag is installed in the accommodating space formed by the groove on the back working surface of the fixed sealing ring. An air inlet pipe is connected to the inflatable airbag, and a pressure gauge and a valve are installed on the air inlet pipe.

[0007] The feed pipe is equipped with a positioning ring to restrict the axial displacement of the fixed sealing ring.

[0008] The positioning ring is provided with a set screw.

[0009] Advantages of this utility model:

[0010] (1) The airbag propulsion ball mill feed sealing device of this utility model extends the replacement cycle of the feed seal;

[0011] (2) The airbag propulsion ball mill feed sealing device of this utility model improves the ball mill operating rate;

[0012] (3) The airbag propulsion ball mill feed sealing device of this utility model avoids the occurrence of equipment accidents;

[0013] (4) The airbag propulsion ball mill feeding sealing device of this utility model avoids environmental pollution. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] The specific embodiments of this utility model are further described below with reference to the accompanying drawings.

[0016] like Figure 1 As shown, the airbag-propelled ball mill feeding sealing device of this utility model includes a rotating sealing ring 1 fixedly connected to the ball mill cylinder, a fixed sealing ring 2 sleeved on the ball mill bend and connected to the outer wall of the bend, and a feed pipe 8. The rotating sealing ring 1 is a bowl-shaped sealing ring with an outer protruding edge and an inner recessed edge, and the fixed sealing ring 2 is a convex bowl-shaped sealing ring coaxially arranged towards the inner recessed surface of the rotating ring.

[0017] An inflatable airbag 3 is installed in the accommodating space formed by the groove on the back working surface of the fixed sealing ring 2. An air inlet pipe 6 is connected to the inflatable airbag 3. A pressure gauge 4 and a valve 5 are installed on the air inlet pipe 6.

[0018] The feed pipe 8 is provided with a positioning ring 9 to restrict the axial displacement of the fixed sealing ring 2.

[0019] The positioning ring 9 is provided with a set screw 7.

[0020] The specific technical solution is as follows:

[0021] 1. The rotating sealing ring 1, which is fixedly connected to the ball mill cylinder, is designed as a bowl-shaped sealing ring with an outer edge protruding and an inner edge recessed, thereby increasing the working thickness of the sealing ring.

[0022] 2. The fixed sealing ring 2, which is fitted onto the ball mill bend and connected to the outer wall of the bend, is designed as a convex cup-shaped sealing ring coaxially facing the inner surface of the moving ring. The sealing method is changed from the original linear contact to arc surface contact, which increases the sealing working area.

[0023] 3. A groove is cut into the back working surface of the fixed sealing ring 2 to form an internal receiving space. An inflatable airbag 3 is installed in the receiving space. The airbag inlet pipe 6 is led to a safe position away from the operating parts of the ball mill. A pressure gauge 4 and a valve 5 are installed for control. A positioning ring 9 is installed in the feed pipe 8 to limit the axial displacement of the fixed sealing ring 2.

[0024] 4. A positioning ring 9 is installed in the feed pipe 8 to limit the axial displacement of the fixing seal ring 2. A set screw 7 is installed on the positioning ring 9 for fixing and adjustment.

[0025] 5. After the sealing ring wears out after the mill has been running for a period of time, the inflatable airbag 3 is inflated according to the actual situation. The expansion of the inflatable airbag 3 pushes the working surface of the fixed sealing ring 2 to move, so that it is always in contact with the working surface of the rotating ring sealing ring 1. This achieves the maintenance of the sealing ring while the ball mill is running, and the inflatable airbag 3 can be reused.

[0026] The specific installation method for ball mill shutdown and maintenance is as follows:

[0027] 1. Rotary sealing ring 1 is installed at the ball mill feed inlet. Rotary sealing ring 1 can be made of rubber, polyurethane, or metal. If it is made of metal, the surface finish of the cup-shaped sealing surface must be ▽6 or higher.

[0028] 2. First, install the inflatable airbag 3 into the internal space of the fixing sealing ring 2. Then, install the fixing sealing ring 2 onto the feed pipe 8, which is welded with the positioning ring 9, and lead the air inlet pipe 6 of the inflatable airbag 3 out from the reserved hole of the positioning ring 9. The fixing sealing ring 2 should be made of rubber with good elasticity, and its inner diameter should be slightly smaller than the outer diameter of the feed pipe 8 to ensure a tight connection between the two.

[0029] 3. Install and adjust the position of the feed pipe 8 so that the rotating sealing ring 1 and the fixed sealing ring 2 are in contact. Tighten the set screw 7 on the fixed positioning ring 9 to further adjust the sealing ring.

[0030] 4. After the ball mill is running, if there is a tendency for material leakage at the feed inlet, the air supply equipment can be used to inflate the airbag 3, so that the airbag 3 expands and pushes the fixed sealing ring 2 to make the working surface contact to prevent material leakage, and the valve 5 controls the air intake, and the pressure gauge 4 detects the pressure value (pressure range is 0-3.5 bar).

[0031] 5. Replace the seal ring according to its wear condition during the next ball mill shutdown maintenance, and retain the inflatable air bag 3 to install into the new fixed seal ring 2.

Claims

1. A pneumatic ball mill feed sealing device, comprising a rotating sealing ring fixedly connected to the ball mill cylinder, a fixed sealing ring sleeved on the ball mill bend and connected to the outer wall of the bend, and a feed pipe, characterized in that, The rotating sealing ring is a cup-shaped sealing ring with an outer protruding edge and an inner recessed edge, and the fixed sealing ring is an outwardly convex cup-shaped sealing ring coaxially arranged facing the inner recessed surface of the rotating ring. An inflatable airbag is installed in the accommodating space formed by the groove on the back working surface of the fixed sealing ring. An air inlet pipe is connected to the inflatable airbag, and a pressure gauge and a valve are installed on the air inlet pipe.

2. The airbag-propelled ball mill feed sealing device according to claim 1, characterized in that, The feed pipe is equipped with a positioning ring to restrict the axial displacement of the fixed sealing ring.

3. The airbag-propelled ball mill feed sealing device according to claim 2, characterized in that, The positioning ring is provided with a set screw.

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