Cylinder bolt sealing device

Abstract

The utility model discloses a cylinder bolt sealing device, and belongs to the technical field of coal water slurry process gasification equipment. The lining plate is arranged in a rod mill barrel, the barrel bolt freely penetrates through the lining plate and penetrates through a bolt hole in the rod mill barrel, the self-locking nut is in threaded connection with the barrel bolt and is located outside the rod mill barrel, and the axis of the barrel bolt is perpendicular to the central axis of the rod mill barrel. According to the cylinder bolt sealing device, the thickened rubber pad, the bowl-shaped structure gland and the base are arranged, so that the position of the cylinder bolt is limited, sealing of the cylinder bolt can be effectively controlled, coal water slurry leakage is prevented, on-site civilized production is guaranteed, raw materials are saved, more importantly, the emergency shutdown overhaul frequency is greatly reduced, and the service life of the cylinder bolt is prolonged. Periodic planned maintenance is basically realized, and no leakage in one operation period is realized.

Description

Technical Field

[0001] The present application relates to the technical field of water-coal slurry gasification equipment, and in particular to a cylinder bolt sealing device. Background Art

[0002] The rod mill is a single-chamber center-discharge wet overflow type. It uses coal and water as raw materials. A certain proportion of additives, alkali solution and flux are added into the mill. The steel rods and liners inside the cylinder are used to grind the coal-water slurry into a high-concentration, low-viscosity, highly stable and easy-to-transport water-coal slurry, which is then sent to the coal slurry tank for standby use, providing qualified raw materials for the gasification section.

[0003] The barrel is the main component of the mill, consisting of the end caps and the cylindrical handle, which together form the grinding space. To enhance the barrel's durability and grinding effect, the barrel liner is made of corrugated manganese steel. A rubber pad is placed between the manganese steel liner and the inner wall of the barrel to cushion the impact of the steel rods and materials on the barrel and to help the liner fit tightly against the inner wall of the barrel. A rubber ring and a metal pressure ring are placed under the nut where the barrel liner seals to prevent the water-coal slurry from flowing out.

[0004] However, during operation, the impact and friction of the steel rods on the cylinder liner can cause the bolts connecting the cylinder and liner to deform and loosen, resulting in severe wear of the cylinder bolt holes and frequent leakage of the bolt seals. This leads to poor on-site hygiene, increased maintenance frequency, and in severe cases, insufficient slurry production in the rod mill to meet the needs of the downstream gasifier, affecting the full load operation of the system and posing a major risk to safe, civilized, and long-term stable operation.

[0005] Therefore, the present application provides a cylinder bolt sealing device to solve the above problems. Utility Model Content

[0006] The present application provides a cylinder bolt sealing device, which aims to solve the problems raised in the background technology, such as the existing cylinder liner being deformed and loosened by the impact and friction of the steel rod, the bolt holes being severely worn and the seals leaking frequently, which become major hidden dangers affecting the safe, civilized and long-term stable operation of the rod mill and the pulping volume meeting downstream needs.

[0007] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a cylinder bolt sealing device, comprising a liner plate disposed within a rod mill cylinder, a cylinder bolt fixedly connected to the liner plate and extending through a bolt hole on the rod mill cylinder, and a self-locking nut threaded onto the cylinder bolt and located outside the rod mill cylinder, wherein the axis of the cylinder bolt is perpendicular to the central axis of the rod mill cylinder;

[0008] The sealing device further comprises a base sleeved on the outside of the cylinder bolts and welded to the outside of the rod mill cylinder, a sealing gasket sleeved on the cylinder bolts and located on the side of the base away from the rod mill cylinder for sealing, and a pressure cover sleeved on the cylinder bolts and located between the sealing gasket and the self-locking nut, wherein the self-locking nut and the pressure cover abut against each other to enable the pressure cover to press the sealing gasket tightly.

[0009] The pressure cover is a bowl-shaped structure, and the sealing gasket is a thickened rubber gasket. The design of the base can compensate for the wear when the bolt hole is worn, and reposition the cylinder bolt installation to ensure that its axis can be perpendicular to the central axis of the rod mill cylinder. This design improves the accuracy of the cylinder bolt installation and ensures that the cylinder bolt can make the rod mill cylinder and the liner evenly stressed after tightening, avoiding applying a large lateral shear force to the cylinder bolt. At the same time, the design of the thickened rubber gasket ensures that the sealing gasket has sufficient deformation and rebound, and the sealing pressure ratio with the base and cylinder bolt is increased, which can better fit the surface of the base and cylinder bolt to play a tight sealing role, prevent water-coal slurry leakage, and also has the function of buffering the impact force generated by the steel rod hitting the liner. The design of the bowl-shaped pressure cover can ensure that the sealing gasket is axially deformed during tightening and extrusion, effectively limit the overflow of the sealing gasket, increase the tightening torque, and further enhance the sealing effect.

[0010] Preferably, in order to ensure that the base can compensate for the wear, the base and the rod mill cylinder are made of the same material; using the same material can ensure that the thermal expansion coefficient, mechanical properties and other physical properties between the base and the rod mill cylinder are similar, so as to position the cylinder bolts and ensure that the cylinder bolt axis is perpendicular to the central axis of the rod mill cylinder. After tightening, the rod mill cylinder and the liner can be evenly stressed, which helps to improve the overall stability and reliability of the sealing device.

[0011] Preferably, in order to ensure the sealing performance of the sealing gasket, the diameter of the sealing gasket is smaller than the diameter of the base; the diameter of the sealing gasket is smaller than the diameter of the base to ensure that the sealing gasket can completely cover the area around the cylinder bolt during installation and will not exceed the range of the base, ensuring that it can maintain sufficient elasticity and sealing performance.

[0012] Preferably, in order to enhance the sealing effect, the thickness of the sealing gasket is 36 mm; the traditional sealing gasket with a thickness of 20 mm is thickened to 36 mm to ensure that the sealing gasket has sufficient deformation and rebound, so that when it is subjected to pressure, the sealing gasket can better fit the bolt hole and the surrounding surface to form a tighter seal.

[0013] Preferably, in order to ensure that the gland prevents the seal from overflowing, the diameter of the side of the gland close to the seal is greater than the diameter of the side of the gland close to the self-locking nut; this design allows the gland to gradually tighten and wrap around the edge of the seal during tightening, forming a tight seal. This tight wrapping effectively limits the overflow of the seal when it is under pressure, ensuring that the seal can remain in the correct position and play its sealing role.

[0014] Preferably, in order to ensure that the seal can fully and tightly adhere to the surface around the bolt hole, the side of the gland close to the seal has an inwardly curved arc surface; the design of the inwardly curved arc surface allows the gland to more effectively transmit force to the seal when it is under the tightening pressure of the self-locking nut. Compared with a flat contact surface, an arc surface can provide more uniform pressure distribution, thereby enhancing the sealing effect.

[0015] The barrel bolt sealing device ensures that it has sufficient deformation and rebound by setting a thickened rubber pad, increases the sealing specific pressure of the base and the barrel bolt, and can better adhere to the surface of the base and the barrel bolt to play a tight sealing role, prevent coal water slurry leakage, ensure on-site civilized production, save raw materials, and more importantly, greatly reduce the frequency of emergency shutdown for maintenance, basically realize periodic planned maintenance, achieve no leakage in one operating cycle, and also have the impact force generated after the buffer steel rod hits the liner;

[0016] The barrel bolt sealing device can ensure that the seal deforms axially when it is under tightening pressure, effectively limit the overflow of the seal, increase the tightening torque, and further enhance the sealing effect by setting a bowl-shaped gland;

[0017] The barrel bolt sealing device can compensate for the wear amount and reposition the barrel bolt installation by setting a base when the bolt hole is worn, ensuring that its axis can be perpendicular to the center axis of the rod mill barrel. This design improves the accuracy of barrel bolt installation and ensures that the barrel bolt can evenly distribute the force between the rod mill barrel and the liner after tightening, avoiding applying a large transverse shear force to the barrel bolt. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Figure 1 is a structural schematic diagram of a barrel bolt sealing device;

[0019] Figure 2 Figure 3 is a structural schematic diagram of the base and the seal in a barrel bolt sealing device;

[0020] Figure 3 Figure 4 is a structural schematic diagram of the seal and the gland in a barrel bolt sealing device.

[0021] In the drawings:

[0022] 1. Rod mill cylinder;

[0023] 2. Lining board;

[0024] 3. Cylinder bolts;

[0025] 4. Self-locking nut;

[0026] 5. Gland;

[0027] 6. Sealing gasket;

[0028] 7. Base. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] This embodiment provides a cylinder bolt sealing device, such as Figure 1-Figure 3 As shown, the sealing device includes a liner 2 arranged in the rod mill cylinder 1, a cylinder bolt 3 fixedly connected to the liner 2 and passing through the bolt hole on the rod mill cylinder 1, and a self-locking nut 4 screwed on the cylinder bolt 3 and located outside the rod mill cylinder 1, and the axis of the cylinder bolt 3 is perpendicular to the central axis of the rod mill cylinder 1; the sealing device also includes a base 7 sleeved on the outside of the cylinder bolt 3 and welded to the outside of the rod mill cylinder 1, a sealing gasket 6 sleeved on the cylinder bolt 3 and located on the side of the base 7 away from the rod mill cylinder 1 for sealing, and a pressure cover 5 sleeved on the cylinder bolt 3 and located between the sealing gasket 6 and the self-locking nut 4, the self-locking nut 4 and the pressure cover 5 abut to enable the pressure cover 5 to press the sealing gasket 6; the pressure cover 5 is a bowl-shaped structure, and the sealing gasket 6 is a thickened rubber gasket.

[0031] Among them, in order to enhance the sealing effect, the thickness of the sealing gasket 6 is 36mm; the traditional thickness of the sealing gasket 6 is thickened to 36mm with a thickness of 20mm to ensure that the sealing gasket 6 has sufficient deformation and rebound, so that when it is subjected to pressure, the sealing gasket 6 can better fit the bolt hole and the surrounding surface to form a tighter seal.

[0032] During use, first align the liner 2 with the bolt hole of the rod mill cylinder 1, then insert the cylinder bolt 3 and fix it, then insert the base 7, and adjust the position of the cylinder bolt 3 to ensure that the axis of the cylinder bolt 3 is perpendicular to the central axis of the rod mill cylinder 1, and then use electric welding to weld the base 7 to the rod mill cylinder 1. After welding is completed and cooled, insert the sealing gasket 6 of the thickened rubber pad and the bowl-shaped structure pressure cover 5 in turn, and then use a pneumatic wrench to rotate and tighten the self-locking nut 4 to make it abut against the pressure cover 5, and squeeze the sealing gasket 6 through the pressure cover 5 to deform it until it fits tightly against the surface around the bolt hole and the base 7, forming a tighter seal to prevent water-coal slurry leakage, ensure civilized production on site, save raw materials, and more importantly, greatly reduce the frequency of emergency shutdown and maintenance, basically realize periodic planned maintenance, and achieve one operating cycle without leakage.

[0033] Specifically, the base 7 and the rod mill cylinder 1 are made of the same material; using the same material can ensure that the thermal expansion coefficient, mechanical properties and other physical properties between the base 7 and the rod mill cylinder 1 are similar. When the cylinder bolt 3 is positioned by the base 7, it can be ensured that the axis of the cylinder bolt 3 is perpendicular to the central axis of the rod mill cylinder 1. After tightening, the rod mill cylinder 1 and the liner 2 can be evenly stressed, which helps to improve the overall stability and reliability of the sealing device.

[0034] Furthermore, the diameter of the sealing gasket 6 is smaller than the diameter of the base 7; the diameter of the sealing gasket 6 is smaller than the diameter of the base 7 to ensure that the sealing gasket 6 can completely cover the area around the cylinder bolt 3 during installation and will not exceed the range of the base 7, ensuring that it can maintain sufficient elasticity and sealing performance.

[0035] Furthermore, the diameter of the gland 5 on the side close to the sealing gasket 6 is larger than the diameter of the gland 5 on the side close to the self-locking nut 4; when the self-locking nut 4 is tightened, the gland 5 can gradually tighten and wrap the edge of the sealing gasket 6 during the process of tightening the sealing gasket 6, forming a tight seal. This tight wrapping effect effectively limits the overflow of the sealing gasket 6 when it is under pressure, ensuring that the sealing gasket 6 can remain in the correct position and play its sealing role.

[0036] Furthermore, the gland 5 has an inwardly curved arc surface on the side close to the sealing gasket 6; the inwardly curved arc surface design enables the gland 5 to more effectively transfer force to the sealing gasket 6 when subjected to the tightening pressure of the self-locking nut 4. Compared with a flat contact surface, the curved surface can provide a more uniform pressure distribution, thereby enhancing the sealing effect.

[0037] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A cylinder bolt sealing device, comprising a liner (2) arranged in a rod mill cylinder (1), a cylinder bolt (3) freely inserted into the liner (2) and passing through a bolt hole on the rod mill cylinder (1), and a self-locking nut (4) screwed on the cylinder bolt (3) and located outside the rod mill cylinder (1), wherein the axis of the cylinder bolt (3) is perpendicular to the central axis of the rod mill cylinder (1); Its characteristics are: The sealing device further comprises a base (7) sleeved on the outside of the barrel bolt (3) and welded to the outside of the rod mill barrel (1), a sealing gasket (6) sleeved on the barrel bolt (3) and located on the side of the base (7) away from the rod mill barrel (1) for sealing, and a pressure cover (5) sleeved on the barrel bolt (3) and located between the sealing gasket (6) and the self-locking nut (4), wherein the self-locking nut (4) and the pressure cover (5) are in contact with each other so that the pressure cover (5) presses the sealing gasket (6); The gland (5) is a bowl-shaped structure, and the sealing pad (6) is a thickened rubber pad.

2. The cylinder bolt sealing device according to claim 1, characterized in that: The base (7) and the rod mill barrel (1) are made of the same material.

3. The cylinder bolt sealing device according to claim 2, characterized in that: The diameter of the sealing gasket (6) is smaller than the diameter of the base (7).

4. The cylinder bolt sealing device according to claim 3, characterized in that: The thickness of the sealing gasket (6) is 36 mm.

5. The cylinder bolt sealing device according to claim 3, characterized in that: The diameter of the side of the gland (5) close to the sealing gasket (6) is larger than the diameter of the side of the gland (5) close to the self-locking nut (4).

6. The barrel bolt sealing device according to claim 5, characterized in that: The pressure cover (5) has an inwardly curved arc surface on a side close to the sealing gasket (6).

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