A fastening and sealing structure of a coal water slurry rod mill barrel lining plate
By combining a sleeve, a rubber sealing ring, and a disc spring, the sealing failure problem at the bolt connection of the water-coal slurry rod mill cylinder liner was solved, achieving stability and reliability of the tight sealing structure and reducing the possibility of slurry leakage.
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINAN HEAVY MACHINERY JOINT STOCK
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-14
AI Technical Summary
The bolted connections of the cylinder liner of the coal-water slurry rod mill are prone to circumferential runout and displacement during long-term rotation, leading to seal failure, slurry leakage, and affecting equipment stability and maintenance costs.
The system employs a combination structure of a sleeve, a rubber sealing ring, a pressure cap, and a disc spring. The sleeve is welded to the cylinder body, the rubber sealing ring is installed in the groove of the sleeve, the pressure cap wraps around the rubber sealing ring, and the disc spring provides clamping force. A tight connection is achieved by tightening the nut.
It effectively prevents circumferential displacement of the gland, ensures the long-term reliability of the sealing structure, reduces the risk of slurry leakage, improves equipment operation stability, and reduces maintenance needs.
Smart Images
Figure CN224486177U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a fastening and sealing structure for the cylinder liner of a coal-water slurry rod mill, and relates to the field of coal-water slurry rod mills. Background Technology
[0002] The cylinder liner of a coal-water slurry rod mill is typically secured with bolt assemblies. However, during long-term operation, the equipment is subjected to immense centrifugal force, the impact of the grinding media, and the high pressure of the coal slurry, causing the gland at the bolt connection to easily experience circumferential runout and displacement. This displacement disrupts the initial fit between the gland and the underlying sealing elements (such as gaskets or sealing rings), leading to seal failure. The highly permeable coal-water slurry then leaks outwards from the gap between the bolt shank and the bolt hole. This leakage not only pollutes the environment and increases cleanup costs, but more seriously, the leaking slurry erodes and wears down the bolts, nuts, and cylinder threads, accelerating fastener loosening and even breakage. This directly threatens the reliability of the liner's fixation, the safe and stable operation of the equipment, and significantly increases maintenance downtime. Therefore, there is an urgent need to develop a cylinder liner fastening structure that can effectively prevent circumferential displacement of the gland and ensure long-term reliable sealing, fundamentally solving the slurry leakage problem. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a fastening and sealing structure for the cylinder liner of a coal-water slurry rod mill, addressing the deficiencies of the existing technology.
[0004] To solve this technical problem, this utility model provides a fastening and sealing structure for the liner of a coal-water slurry rod mill, including bolts, sleeves, rubber sealing rings, pressure caps, disc springs, and nuts. The sleeve is a circular groove structure with a countersunk groove. The sleeve is welded to the bolt holes on the cylinder. The bolts pass through the holes in the liner, cylinder, and sleeve, with their threaded portions located on the outer wall of the cylinder. The rubber sealing ring passes through the bolts and is installed in the countersunk groove of the sleeve. The pressure cap passes through the bolts and is installed on the rubber sealing ring, covering the exposed portion of the rubber sealing ring. The disc springs are installed in pairs above the pressure caps. The nuts are installed in pairs above the disc springs and tightened.
[0005] The groove depth of the sleeve is 1 / 3 to 2 / 3 of the thickness of the rubber sealing ring.
[0006] The inner ring of the rubber sealing ring has multiple sealing protrusions. When the nut is tightened, the rubber sealing ring is compressed, and the sealing protrusions fit tightly against the shank of the bolt.
[0007] The gland is a circular groove structure with a stepped recess. The stepped recess fits tightly with the rubber sealing ring and the sleeve. After the gland is assembled, the stepped recess covers the upper part of the rubber sealing ring and the sleeve.
[0008] The disc springs are mounted in pairs above the pressure cap and provide downward clamping force to the pressure cap through their cooperation with the nut.
[0009] Beneficial effects: Compared with the prior art, the fastening and sealing structure of this utility model is less prone to slurry leakage due to structural displacement; the fastening and sealing structure connection is tighter and more secure. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model;
[0011] Figure 2 This is a schematic diagram of the structure of the sleeve of this utility model;
[0012] Figure 3 This is a schematic diagram of the structure of the rubber sealing ring of this utility model;
[0013] Figure 4 This utility model Figure 3 Enlarged schematic diagram of the rubber sealing ring in section I;
[0014] Figure 5 This is a schematic diagram of the structure of the pressure cap of this utility model.
[0015] In the diagram: 1. Liner plate; 2. Cylinder body; 3. Pressure cap; 4. Disc spring; 5. Bolt; 6. Nut; 7. Rubber sealing ring; 8. Sleeve; 31. Stepped groove; 51. Bolt head; 71. Sealing protrusion structure; 81. Groove. Detailed Implementation
[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0017] like Figures 1-5 As shown, this utility model provides a fastening and sealing structure for the liner of a coal-water slurry rod mill, including bolts 5, sleeves 8, rubber sealing rings 7, pressure caps 3, disc springs 4, and nuts 6. The sleeves 8 are circular groove structures with a recessed groove 81. The sleeves 8 are welded to the bolt holes on the cylinder 2 to prevent gaps from forming at the contact surface and causing slurry leakage. The bolts 5 pass through the holes in the liner 1, the cylinder 2, and the sleeves 8, with their threaded portions located on the outer wall of the cylinder 2. The rubber sealing rings 7 pass through the bolts 5 and are installed in the recessed grooves 81 of the sleeves 8. The pressure caps 3 pass through the bolts 5 and are installed on the rubber sealing rings 7, covering the exposed portion of the rubber sealing rings 7. The disc springs 4 are installed in pairs above the pressure caps 3. The nuts 6 are installed in pairs above the disc springs 4 and tightened.
[0018] The groove 81 of the sleeve 8 has a depth of 1 / 3 to 2 / 3 of the thickness of the rubber sealing ring 7, which can wrap around the rubber sealing ring 7 and make the installation more secure.
[0019] The inner ring of the rubber sealing ring 7 is provided with multiple sealing protrusions 71. When the nut 6 is tightened, the rubber sealing ring 7 is compressed, and the sealing protrusions 71 fit tightly with the shank of the bolt 5, which can effectively seal the slurry.
[0020] The pressure cap 3 has a circular groove structure with a stepped recess 31. The stepped recess 31 fits tightly with the rubber sealing ring 7 and the sleeve 8. After the pressure cap 3 is assembled, the stepped recess 31 covers the upper part of the rubber sealing ring 7 and the sleeve 8. When the nut 6 is tightened, there will be no circumferential displacement or sliding of the pressure cap 3, reducing the possibility of slurry leakage from this point.
[0021] The disc springs 4 are installed in pairs above the pressure cover 3, and provide downward clamping force to the pressure cover 3 through cooperation with the nut 6, making the seal more secure.
[0022] The fastening and sealing structure of this utility model is less prone to slurry leakage due to structural displacement; the gland is provided with a stepped groove, and when the nut is tightened, the gland will not shift or slide circumferentially, reducing the possibility of slurry leakage from this point; the multi-seal protrusion structure of the inner ring of the rubber sealing ring can better seal the slurry; the disc springs are used in pairs, and through cooperation with the nut, the fastening and sealing structure is more tightly and firmly connected.
[0023] The above-described embodiments of this utility model are merely illustrative examples and are not the only ones. All modifications within the scope of this utility model or equivalent to this utility model are encompassed by this utility model.
Claims
1. A fastening and sealing structure for the liner plate of a coal-water slurry rod mill, characterized in that: The assembly includes a bolt (5), a sleeve (8), a rubber sealing ring (7), a pressure cap (3), a disc spring (4), and a nut (6). The sleeve (8) has a circular groove structure and a recess (81). The sleeve (8) is welded to the bolt hole on the cylinder (2). The bolt (5) passes through the holes of the liner (1), the cylinder (2), and the sleeve (8), and its threaded part is located on the outer wall of the cylinder (2). The rubber sealing ring (7) passes through the bolt (5) and is installed in the recess (81) of the sleeve (8). The pressure cap (3) passes through the bolt (5) and is installed on the rubber sealing ring (7), covering the exposed part of the rubber sealing ring (7). The disc springs (4) are installed in pairs above the pressure cap (3). The nuts (6) are installed in pairs above the disc springs (4) and tightened.
2. The fastening and sealing structure of the water-coal slurry rod mill cylinder liner according to claim 1, characterized in that: The depth of the groove (81) of the sleeve (8) is 1 / 3 to 2 / 3 of the thickness of the rubber sealing ring (7).
3. The fastening and sealing structure of the water-coal slurry rod mill cylinder liner according to claim 1, characterized in that: The inner ring of the rubber sealing ring (7) is provided with multiple sealing protrusions (71). When the nut (6) is tightened, the rubber sealing ring (7) is compressed, and the sealing protrusions (71) fit tightly against the rod of the bolt (5).
4. The fastening and sealing structure of the water-coal slurry rod mill cylinder liner according to claim 1, characterized in that: The pressure cap (3) has a circular groove structure and a stepped groove (31). The stepped groove (31) fits tightly with the rubber sealing ring (7) and the sleeve (8). After the pressure cap (3) is assembled, the stepped groove (31) wraps around the upper part of the rubber sealing ring (7) and the sleeve (8).
5. The fastening and sealing structure for the water-coal slurry rod mill cylinder liner according to any one of claims 1-4, characterized in that: The disc springs (4) are installed in pairs above the cover (3) and provide downward clamping force to the cover (3) through cooperation with the nut (6).