Sealing device for feeding end of rod mill

Abstract

The utility model provides a sealing device for a feeding end of a rod mill, which is characterized in that a feeding pipe of the rod mill extends into a barrel from the feeding end of the barrel, and the feeding end of the barrel is connected with an end cover through a connecting bolt; the sealing device comprises a plurality of floating sealing rings and a flexible packing ring, the floating sealing rings are stacked on the outer side wall, away from the cylinder, of the end cover in the axial direction, the feeding pipe is sleeved with the floating sealing rings, gaps are reserved between the floating sealing rings and the feeding pipe, and the outer circle faces of the floating sealing rings are clamped on the side wall of a bolt head of a connecting bolt on the end cover. The floating sealing ring rotates along with the cylinder body; the feeding pipe is tightly sleeved with the flexible packing ring, the flexible packing ring is pressed on the top face of the bolt head of the connecting bolt, and the flexible packing ring is pressed on the floating sealing ring on the outermost side. The sealing device can be used for sealing a gap between the barrel and the feeding pipe of the rod mill, and has the advantages of simple structure, good sealing effect, long service life and convenience in installation.

Description

TECHNICAL FIELD

[0001] The utility model relates to rod mill feed end sealing technical field especially relates to a rod mill feed end sealing device. BACKGROUND

[0002] Rod mill is a kind of mill, and the grinding body loaded in the barrel is steel rod, and it is an important equipment for preparing coal slurry in gasification device in coal chemical industry. The material enters the barrel from the rod mill feed end through the feed pipe, and the barrel rotates, and the steel rod in the barrel is lifted to a certain height under the action of centrifugal force and friction, and falls in the state of throwing or leaking, so as to crush the material in the barrel. There is a gap between the connecting part of the feed pipe and the barrel, and a rubber pad is usually used for sealing, but the sealing method has serious slurry leakage, which affects the safety production and pollutes the site environment, and wastes resources. At present, there are many rod mill feed end sealing products, for example, the patents CN219965048U, CN217898778U, CN217842647U and CN217814950U all seal the rod mill feed end through different sealing devices. The structures of these sealing devices are complex or simple, and the sealing performance is different. However, in general, it is the common expectation of the technical personnel in the field to provide a sealing device with simple structure, convenient installation, good sealing performance and long service life. SUMMARY

[0003] The utility model provides a kind of rod mill feed end sealing device, the sealing device can seal the gap between the barrel and feed pipe of rod mill, and has the advantages of simple structure, good sealing effect, long service life and convenient installation.

[0004] The technical scheme adopted by the utility model to achieve the above-mentioned purposes is as follows:

[0005] A kind of rod mill feed end sealing device, the feed pipe of the rod mill extends into the barrel interior from the feed end of the barrel, the sealing device is installed between the barrel and the feed pipe, and seals the gap between the barrel and the feed pipe, the feed end of the barrel is connected with an end cover by connecting bolts, and the bolt head of the connecting bolt protrudes on the outer side wall of the end cover away from the barrel;The sealing device includes a floating seal ring and a flexible packing ring, wherein multiple floating seal rings are stacked on the outer side wall of the end cover away from the barrel along the axial direction, and the floating seal ring is sleeved on the feed pipe, leaving a gap between the floating seal ring and the feed pipe, and the outer circular surface of the floating seal ring is clamped on the side wall of the bolt head of the connecting bolt on the end cover, so that the floating seal ring rotates with the barrel;The flexible packing ring is tightly sleeved on the feed pipe and pressed on the top surface of the bolt head of the connecting bolt, and the flexible packing ring is pressed on the outermost floating seal ring.

[0006] The outer circular surface of the flexible packing ring is tightly sleeved with a sealing sleeve in the form of a ring.

[0007] The flexible packing ring is a split structure.

[0008] The outer side wall of the sealing sleeve is fixedly attached with a ring-shaped gland, and the gland is sleeved on the feed pipe and is pressed against the outer side wall of the flexible packing ring.

[0009] The cross section of the sealing sleeve is in a stepped shape, and the gland is pressed against the end cover and the top surface of the bolt head of the connecting bolt on the end cover.

[0010] The gland and the sealing sleeve are fixedly connected through fastening bolts.

[0011] A plurality of connecting bolts are evenly arranged on the end cover, and the outer circumferential surface of the floating seal ring is outwardly provided with arc-shaped grooves matched with the shape and size of the bolt heads of the connecting bolts, and the number and position of the arc-shaped grooves on the floating seal ring are matched with the number and position of the connecting bolts on the end cover, and when the floating seal ring is stacked on the outer side wall of the end cover away from the cylinder, the bolt heads of the connecting bolts on the end cover are located in the arc-shaped grooves on the outer circumferential surface of the floating seal ring.

[0012] The floating seal ring is a split structure, and the split parts of adjacent two floating seal rings are staggered.

[0013] The gap between the floating seal ring and the feed pipe is 0.5mm.

[0014] The thickness of all the stacked floating seal rings is less than the length of the bolt heads of the connecting bolts protruding from the surface of the end cover.

[0015] Compared with the prior art, the rod mill feed end sealing device has the following advantages: 1. The sealing device can seal the gap between the cylinder and the feed pipe of the rod mill, and has the advantages of simple structure, good sealing effect, long service life and convenient installation.

[0016] 2. The sealing device seals the cylinder and the feed pipe through multiple layers of floating seal rings, which can not only ensure the sealing effect, but also reduce the wear of the floating seal rings and ensure the service life of the sealing device; and the flexible packing ring limits the floating distance of the floating seal ring in the axial direction, and at the same time, the flexible packing ring plays a compensating sealing effect, further improving the sealing performance.

[0017] 3. The floating seal ring and the flexible packing ring in the utility model are both split structures, the split parts of the floating seal ring are staggered, the flexible packing ring is tightly sleeved through the sealing sleeve, which is convenient for installation and avoids the influence of the split structure on the sealing performance; and the setting of the gland further ensures the stability and reliability of the entire sealing device.

[0018] 4. In this utility model, an arc-shaped groove is provided on the outer circular surface of the floating sealing ring. The arc-shaped groove is used to hold the floating sealing ring between the connecting bolts of the end cover. This not only prevents the floating sealing ring from moving radially, allowing it to rotate with the cylinder, but also allows the floating sealing ring to float axially. This compensates for the misalignment between the cylinder and the feed pipe, ensuring a uniform gap between the floating sealing ring and the feed pipe, guaranteeing the best sealing effect. At the same time, it prevents the sealing ring from wearing due to misalignment with the feed pipe when the cylinder rotates, thus affecting the service life of the sealing device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the connection between the cylinder and the feed pipe of the rod mill in this utility model;

[0020] Figure 2 This is a schematic diagram of the installation of the rod mill feed end sealing device provided by this utility model;

[0021] Figure 3 This is a schematic diagram of the floating sealing ring in this utility model;

[0022] Figure 4 This is a schematic diagram of the flexible packing ring in this utility model;

[0023] In the diagram: 1-feed pipe, 2-cylinder, 3-end cap, 4-connecting bolt, 5-floating sealing ring, 501-arc groove, 6-flexible packing ring, 7-sealing sleeve, 8-pressure cap, 9-fastening bolt. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] The structure of the rod mill feed end sealing device provided by this utility model is as follows: Figure 2 As shown, the feed pipe 1 of the rod mill extends into the interior of the cylinder 2 from the feed end, as... Figure 1 As shown, a sealing device is installed between the cylinder and the feed pipe to seal the gap between them. In this embodiment, an end cap 3 is connected to the feed end of the cylinder by connecting bolts 4, and the bolt heads protrude from the outer side wall of the end cap away from the cylinder. The sealing device is installed between the end cap and the feed pipe. Specifically, the connecting bolts are evenly distributed in a circle along the end cap. When the rod mill is working, the cylinder rotates, the end cap rotates with the cylinder, while the feed pipe remains stationary.

[0026] The sealing device in the embodiment comprises floating sealing rings 5, a flexible packing ring 6, a sealing sleeve 7 and a gland 8. The floating sealing rings are stacked in the axial direction on the outer side wall of the end cover away from the cylinder. In the embodiment, four floating sealing rings are provided, and the floating sealing rings are sleeved on the feed pipe. A gap is left between the floating sealing rings and the feed pipe. The outer circumferential surface of the floating sealing ring is clamped on the side wall of the bolt head of the connecting bolt of the end cover, so that the floating sealing ring rotates together with the cylinder. Specifically, an arc-shaped groove 501 matching the shape and size of the bolt head of the connecting bolt is provided on the outer circumferential surface of the floating sealing ring, as shown in Figure 3 The number and position of the arc-shaped grooves on the floating sealing ring match the number and position of the connecting bolts on the end cover. When the floating sealing rings are stacked on the outer side wall of the end cover away from the cylinder, the bolt heads of the connecting bolts on the end cover are located in the arc-shaped grooves on the outer circumferential surface of the floating sealing ring, so that the connecting bolts drive the floating sealing rings to rotate together when the cylinder rotates. Specifically, the floating sealing ring is made of PTFE or other wear-resistant materials. Further, the floating sealing ring has a split structure, which facilitates the installation of the floating sealing ring, and the split parts of adjacent two floating sealing rings are staggered to avoid material leakage from the split parts. Preferably, the gap between the floating sealing ring and the feed pipe is 0.5 mm, which avoids wear between the floating sealing ring and the feed pipe when the cylinder rotates, and the small gap can ensure the generation of a stable gas film or liquid film between the floating sealing ring and the feed pipe, thereby achieving a sealing effect and preventing material leakage. Further, the thickness of all the stacked floating sealing rings is less than the length of the bolt head of the connecting bolt protruding from the surface of the end cover, which ensures that all the floating sealing rings can have a small axial floating movement between the end cover and the flexible packing ring, compensates for the eccentricity between the cylinder and the feed pipe, ensures uniform gap between the floating sealing ring and the feed pipe, guarantees the best sealing effect, and avoids wear of the sealing ring due to the eccentricity between the cylinder and the feed pipe when the cylinder rotates, thereby affecting the service life of the sealing device.

[0027] The flexible packing ring is tightly sleeved on the feed pipe and pressed on the top surface of the bolt head of the connecting bolt, and the flexible packing ring is pressed on the outermost floating sealing ring, thereby limiting the floating sealing ring in the axial direction, and the flexible packing ring is tightly attached to the feed pipe, thereby further ensuring the sealing effect.

[0028] In the embodiment, a sealing sleeve in the form of a whole ring is tightly sleeved on the outer circumferential surface of the flexible packing ring, which can further press the flexible packing ring on the feed pipe. Specifically, the sealing sleeve is made of metal materials such as stainless steel. Further, the flexible packing ring has a split structure, as shown in Figure 4As shown, this facilitates the installation of the flexible packing ring. The gland is annular in shape and is fixed against the outer wall of the sealing sleeve. The gland is also loosely fitted onto the feed pipe and pressed against the outer wall of the flexible packing ring, thereby further limiting the axial movement of the flexible packing ring. Specifically, the gland and the sealing sleeve are connected and fixed by fastening bolts 9. Furthermore, the sealing sleeve has a stepped cross-section, and the gland presses the sealing sleeve against the end cap and the top surface of the bolt heads of the connecting bolts on the end cap.

[0029] The rod mill feed end sealing device provided in this application is equipped with a flexible packing ring and a multi-layer floating sealing ring. The sealing device has a simple structure and has the advantages of good sealing effect, long service life and convenient installation in practical applications.

Claims

1. A sealing device for the feed end of a rod mill, wherein the feed pipe of the rod mill extends into the interior of the cylinder from the feed end of the cylinder, and the sealing device is installed between the cylinder and the feed pipe to seal the gap between the cylinder and the feed pipe, characterized in that: The feed end of the cylinder is connected to an end cap by connecting bolts, and the bolt heads of the connecting bolts protrude from the outer side wall of the end cap away from the cylinder. The sealing device includes a floating sealing ring and a flexible packing ring. Multiple floating sealing rings are stacked axially on the outer side wall of the end cap away from the cylinder, and the floating sealing rings are fitted onto the feed pipe with a gap between them. The outer surface of the floating sealing rings is engaged with the side wall of the bolt head of the connecting bolt on the end cap, so that the floating sealing rings rotate with the cylinder. The flexible packing rings are tightly fitted onto the feed pipe and press against the top surface of the bolt head of the connecting bolt, and the flexible packing rings press against the outermost floating sealing rings.

2. The rod mill feed end sealing device according to claim 1, characterized in that: The outer circumference of the flexible packing ring is tightly fitted with an integrally annular sealing sleeve.

3. The rod mill feed end sealing device according to claim 2, characterized in that: The flexible packing ring has a split structure.

4. The rod mill feed end sealing device according to claim 2, characterized in that: An integrally annular pressure cap is fixed to the outer wall of the sealing sleeve, and the pressure cap is loosely fitted on the feed pipe and pressed against the outer wall of the flexible packing ring.

5. The rod mill feed end sealing device according to claim 4, characterized in that: The sealing sleeve has a stepped cross-section, and the gland presses the sealing sleeve tightly onto the top surface of the bolt head of the end cover and the connecting bolt on the end cover.

6. The rod mill feed end sealing device according to claim 4, characterized in that: The gland and the sealing sleeve are connected and fixed by fastening bolts.

7. The rod mill feed end sealing device according to claim 1, characterized in that: The connecting bolts are evenly distributed in a circle along the end cover. The outer circular surface of the floating sealing ring is provided with an arc-shaped groove that matches the shape and size of the bolt head of the connecting bolt. The number and position of the arc-shaped grooves on the floating sealing ring match the number and position of the connecting bolts on the end cover. When the floating sealing ring is stacked on the outer wall of the end cover away from the cylinder, the bolt heads of the connecting bolts on the end cover are all located in the arc-shaped grooves on the outer circular surface of the floating sealing ring.

8. The rod mill feed end sealing device according to claim 1, characterized in that: The floating sealing ring has a split structure, and the split points of two adjacent floating sealing rings are staggered.

9. The rod mill feed end sealing device according to claim 1, characterized in that: The gap between the floating sealing ring and the feed pipe is 0.5 mm.

10. The rod mill feed end sealing device according to claim 1, characterized in that: The thickness of all the floating sealing rings stacked together is less than the length of the bolt head protruding from the end cap surface of the connecting bolt.

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