Sealing structure of clarifying tank raking machine main shaft

Abstract

A sealing structure of a clarifying tank raking machine main shaft comprises a main shaft, a tank cover, a bracket, padding, a pressing plate, a gland and a fastening bolt assembly, the main shaft rotates at the tank top, the bracket is fixed to the tank cover, padding blocks of different models are installed in the bracket and covered by the pressing plate and the gland, the gland is fixed to the upper face of the bracket, and the fastening bolt assembly is fixed to the upper face of the bracket. And the filler is extruded and the gap is filled so as to control the gap between the main shaft and the tank cover. When the packing loses elasticity due to extrusion, the fastening bolt compresses the gland and acts on the packing, the packing is further stressed and deformed and is attached between the main shaft and the groove cover, the sealing packing has flexibility and corrosion resistance, the transmission main shaft cannot be abraded, and the adjustable fastening assembly is adopted to compensate the radial distance generated after the compressed packing is compressed. According to the technical scheme, harmful gas can be effectively prevented from overflowing from gaps around the main shaft, the field operation environment is improved, personnel safety is guaranteed, and a harmful gas detector is prevented from giving an alarm.

Description

Technical Field

[0001] The utility model belongs to the technical field of rake machines and relates to an improved solution for the sealing structure of a main shaft of a clarifier rake machine. Background Art

[0002] The rake feeder is a key operating equipment in the gasification slag water treatment unit. The stability of its operation directly affects the production stability of the entire gasification device. The rake feeder transmission device drives the main shaft to rotate, and the main shaft drives the scraper to rotate. The rake plate installed under the rake frame scrapes the sludge to the center of the pool and discharges the sludge out of the pool through the sludge discharge pipe in the center of the pool. The main shaft of the rake feeder installed on the top of the clarification tank rotates to one side and moves axially; at the same time, when the resistance of the main rake of the rake feeder is large, the height of the rake will be increased, and the radial movement will be carried out to reduce the resistance and prevent the torque from being too large and the rake from breaking. There is a gap between the rotating main shaft and the tank cover. The steam and harmful gases generated by the ash water will rise and overflow from the gap, causing the toxic and harmful alarm at the inspection site to alarm. While ensuring the normal operation of the rotating main shaft and the tank cover, the sealing device of the utility model can prevent the gaseous material from overflowing through the gap in large quantities. Summary of the Invention

[0003] In order to prevent the material from overflowing from the gap between the rake machine main shaft and the trough cover and ensure the continuous and environmentally friendly operation of the equipment, a sealing improvement solution is provided.

[0004] The utility model provides an improved solution for the sealing structure of the main shaft of the clarifier rake machine. The purpose of the invention is to overcome the shortcomings of the existing technology and provide a sealing device for the rotating main shaft of the clarifier, which does not affect the normal rotation and lifting of the main shaft and can achieve a good sealing effect.

[0005] The sealing device of the present invention includes a main shaft, a slot cover, a bracket, a filler, a pressure plate, a pressure cover and a fastening bolt assembly, and the rotating main shaft rotates at the top of the slot; the bracket is fixed to the slot cover, and a filler block is installed in the bracket, and the filler block is covered by a pressure plate and a pressure cover, and the pressure cover is fixed on the bracket to squeeze the filler and fill the gap to control the gap between the main shaft and the slot cover; the pressure cover is provided with a fastening bolt, and there is a certain compression margin between the pressure cover and the bracket in the vertical direction. It is pre-tightened after the first installation and then tightened again according to the effect during use; the fillers are all connected in the form of convex and concave, the pressure plate is an elastic plate at a certain angle, and the pressure cover is formed by docking two semicircles, and the interface between the primary seal and the secondary seal filler is staggered in the vertical direction.

[0006] Beneficial effects: According to the above technical solutions, the utility model has the following advantages: 1. The filler is filled between the main shaft and the slot cover to ensure the normal rotation and raking of the main shaft; 2. When the filler loses its elasticity after being squeezed, the fastening bolts press the gland and act on the filler, and the filler will be further deformed by the force and fit between the main shaft and the slot cover; 3. The sealing filler has flexibility and corrosion resistance and will not wear the transmission main shaft; 4. An adjustable fastening component is used to compensate for the radial distance caused by the compression of the packing; 5. The main shaft has a large diameter, and the sealing filler, pressure plate and gland are all open, which is convenient for installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of a sealing structure of a main shaft of a clarifier rake machine involved in the present utility model;

[0008] Figure 2 This is a schematic diagram of the structure of the sealing filler I involved in the present utility model;

[0009] Figure 3 This is a schematic diagram of the structure of the sealing filler II involved in the present utility model;

[0010] Figure 4 This is a schematic diagram of the pressure plate structure involved in the present utility model;

[0011] Figure 5 A schematic diagram of the gland involved in the present utility model;

[0012] In the figure: 1. Slot cover; 2. Bracket; 3. Packing I; 4. Pressure plate; 5. Packing II; 6. Gland; 7. Gasket; 8. Spring washer; 9. Nut; 10. Bolt; 11. Rotating spindle. DETAILED DESCRIPTION

[0013] like Figure 1-5 In the invention, a sealing structure of a main shaft of a clarifier rake feeder is disclosed, comprising a tank cover 1 of the clarifier and a rotating main shaft 11 driven in the tank cover 1. The tank cover 1 comprises a rotating main shaft 11, and a gap between the rotating main shaft 11 and the tank cover 1 is filled with a filler I3 in a bracket 2. The filler I3 is covered by a pressure plate 4, which is covered by a filler II5, which is squeezed by a pressure cover 6. Finally, a vertical force is evenly transmitted to the fillers I3 and II5 through a fastening bolt 8, so that the primary filler and the secondary filler are elastically deformed by the extrusion, forming a primary annular sealing cavity and a secondary annular sealing cavity with the main shaft, thereby fitting tightly to the main shaft and maintaining a good seal.

[0014] In a preferred embodiment, the rotating spindle 11 rotates in the slot cover 1, and a necessary gap is provided between the two.

[0015] A bracket 2 is fixed to the top of the tank cover 1. Inside the bracket 2, from the bottom upward, are two different types of sealing packings, I3 and II5, made of different materials and specifications. Sealing packing I3 is secured by an upper elastic pressure plate 4, forming a primary seal. Sealing packing II5 is secured by an upper gland 6, forming a secondary seal. In a preferred embodiment, a screw 8 above the gland 6 is connected to the bracket 2. By tightening a nut 9, the screw is stressed, driving the gland 6 downward, causing the sealing packing II5 to deform under the force.

[0016] In a preferred embodiment, when the rotating main shaft 11 rotates or rises, the rotating main shaft 11 only contacts the sealing packing I3 and packing II5. The packing I3 and packing II5 are flexible and corrosion-resistant, ensuring sealing without wearing the rotating main shaft 11 or affecting the transmission of the rotating main shaft 11.

[0017] In the preferred embodiment, the packing I3 ages due to contact with moisture in the groove, causing elastic deformation and failure, resulting in larger gaps and a weakened sealing effect, thus failing the primary seal. The packing II5 is further squeezed by the gland 2. Since the packing II5 is not in contact with the medium, it does not age or deteriorate rapidly. The secondary seal provides protection, further eliminating the gap between the rotating spindle 11 and the packing I3.

[0018] In the preferred solution, after the packing II 5 fails, the fastening bolts 8 and the gland 2 are removed, and the packing II 5, the pressure plate 4, and the packing I3 are removed from top to bottom at once. Then, the first-level sealing packing I3 is installed, the pressure plate 4 is placed, the packing II 5 is installed, and the gland 6 is tightened to obtain a good seal again, achieving a double sealing effect.

[0019] The sealing structure described in the present invention can be carried out during the original main shaft installation or during routine maintenance. The pressure plate and the pressure cover are both two-half structures, and the filler I3 and the filler II5 are concave-convex interfaces. There is no need to disassemble the main shaft, and the sealing components can be replaced regularly and simply and conveniently to achieve a durable sealing effect.

Claims

1. A sealing structure for a main shaft of a clarifier rake, comprising a clarifier cover (1) and a rotating main shaft (11) disposed in the cover (1), characterized in that: The slot cover (1) includes a rotating spindle (11). The gap between the rotating spindle (11) and the slot cover (1) is filled with filler I (3) in the bracket (2). The filler I (3) is covered by the pressure plate (4). The pressure plate (4) is covered by filler II (5). The filler II (5) is squeezed by the pressure cover (6), so that the first-level filler and the second-level filler are elastically deformed by the squeezing, thereby closely fitting the spindle and maintaining a good seal.

2. The sealing structure of the main shaft of the clarifier rake according to claim 1, characterized in that: There is a gap between the rotating main shaft (11) and the slot cover (1), and a sealing filler I (3), a pressure plate (4), a filler II (5), and a pressure cover (6) are provided in the bracket (2).

3. The sealing structure of the main shaft of the clarifier rake according to claim 2, characterized in that: The sealing filler I (3) in the bracket (2) is covered by a pressure plate (4), the pressure plate (4) is filled with filler II (5), and the filler II (5) is squeezed by a pressure cover (6).

4. The sealing structure of the main shaft of the clarifier rake according to claim 1, characterized in that: The gland (6) is fastened by bolts (8) on all sides and moves downward in a vertical stroke to evenly transmit the force downward.

5. The sealing structure of the main shaft of the clarifier rake according to claim 2, characterized in that: The filler I (3) is squeezed by the pressure plate (4), and the filler II (5) is squeezed by the pressure cover (6) to elastically deform, thereby forming a primary annular sealing cavity and a secondary annular sealing cavity with the main shaft.

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