Paddle shaft of paddle dryer

Abstract

The paddle shaft comprises a main shaft, a transmission shaft and a heating end, the heating end and the transmission shaft penetrate into the main shaft from the two ends of the main shaft respectively, symmetrical steps are arranged on the outer wall of the main shaft, a lining is sleeved on the outer wall of the main shaft on the lower face of the steps, a first flange plate is integrally formed at one end of the lining, and a second flange plate is integrally formed at the other end of the lining. The transmission shaft and the heating end are sleeved with clamping sleeves respectively, each clamping sleeve comprises a connecting sleeve and an elastic abutting sleeve, the end, with a smaller opening, of the abutting sleeve penetrates into the connecting sleeve, the outer wall of the abutting sleeve is attached to the inner wall of the connecting sleeve, a second flange plate is integrally formed at the other end of the abutting sleeve, and the abutting sleeve is located between the lining and the connecting sleeve. The first flange plate makes contact with the second flange plate, and the clamping sleeve is connected with the lining through a connecting piece. The clamping sleeve is clamped on the heating end and the transmission shaft, and then the bushing is fixed with the clamping sleeve, so that the clamping sleeve is fixed on the main shaft, the bushing is detachably connected with the main shaft, and the clamping sleeve is convenient to replace.

Description

Technical Field

[0001] This utility model relates to the field of stirring and drying equipment technology, and in particular to a paddle shaft for a paddle dryer. Background Technology

[0002] A paddle dryer is a low-speed agitation dryer that uses an internal stirring paddle to ensure wet materials come into full contact with the heat carrier and heated surfaces, thus achieving the drying purpose. It is typically horizontal, with two or four shafts. Paddle dryers are divided into hot air and conductive types. A paddle dryer consists of two to four interlocking paddle shafts, a W-shaped jacketed shell, a base, and a transmission system. The entire drying process is carried out in a closed environment, and volatile organic compounds and odorous gases are sent to a tail gas treatment device in a sealed atmosphere to avoid environmental pollution.

[0003] When the blade shaft rotates, friction occurs between it and the housing, causing wear on the blade shaft and reducing its service life. Therefore, designers choose materials with low hardness and good wear resistance for the bushing or sleeve during the design process. This can reduce the wear of the shaft and the housing. Generally, the bushing of the blade main shaft cannot be removed from the top. It can only be replaced with a new bushing when it is completely worn out. If the bushing is not replaced in time after it is worn out, the stability of the main shaft rotation will be reduced. Utility Model Content

[0004] The purpose of this invention is to provide a blade shaft for a blade dryer, which has the advantage that the bushing can be removed from the main shaft for timely replacement.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A paddle shaft for a paddle dryer includes a drive shaft, which comprises a main shaft, a transmission shaft, a heating end, and a central tube. The heating end and the transmission shaft respectively enter the main shaft from both ends. The central tube passes through the main shaft and through the heating end and the transmission end. The outer diameter of the middle section of the main shaft is larger than the outer diameter of its two ends. The larger outer diameter section forms two steps with the two smaller outer diameter sections. A bushing is fitted on the outer wall of the main shaft at the lower surface of the steps. A flange is integrally formed at the end opening of the bushing away from the side wall of the step. The first disc also includes two retaining sleeves, which are respectively fitted onto the drive shaft and the heating end. Each retaining sleeve includes a connecting sleeve and a retaining sleeve. The retaining sleeve is frustoconical and elastic. The connecting sleeve has a wedge-shaped surface inside that matches the outer wall of the retaining sleeve. The smaller opening end of the retaining sleeve is inserted into the interior of the connecting sleeve, and the outer wall of the retaining sleeve is in contact with the inner wall of the connecting sleeve. The outer wall of the larger opening end of the retaining sleeve is integrally formed with a second flange. The retaining sleeve is located between the bushing and the connecting sleeve, and the first flange is in contact with the second flange.

[0007] Using the above technical solution, the ferrule and bushing are respectively fitted onto the main shaft, heating end, and drive shaft, with the flange two of the clamping sleeve contacting the flange one. The ferrule and bushing are connected by a connector. Simultaneously, under the action of the connector, the connecting sleeve moves towards the clamping sleeve. The outer wall of the moving clamping sleeve exerts a force on the inner wall of the connecting sleeve, causing the clamping sleeve to deform and contract inward, reducing its diameter and gripping the heating end and drive shaft respectively. This fixes the ferrule to both, while the bushing connected to the ferrule is fixed by the ferrule. On the main shaft, when the main shaft is connected to the housing, the bushing contacts the housing, and the rotating shaft drives the bushing to rotate. The rotating shaft is protected by the bushing and will not be worn by the housing. Remove the connecting piece and move the connecting sleeve away from the clamping sleeve. The distance between the clamping sleeve and the connecting sleeve increases, and the force between the two gradually decreases. The clamping sleeve returns to its original shape, the aperture becomes larger, and the force of the clamping sleeve on the drive shaft and heating end decreases. Then the ferrule and the bushing can be removed and the bushing replaced to prevent the bushing from being worn and not being replaced in time, which would affect the stability of the main shaft rotation.

[0008] Preferably, the connecting component is a bolt and nut, with the bolt horizontally passing through the second flange, the connecting sleeve, and the second flange, and the nut threaded onto the bolt. The second flange, the connecting sleeve, and the second flange are located between the nut and the tail of the bolt.

[0009] Using the above technical solution, the bolt is passed through the connecting sleeve and the contacting flange one and flange two, with the tail and end of the bolt close to the connecting sleeve and flange one respectively. Nuts are screwed onto the bolts, and then both are tightened. The nuts and the tail of the bolt push the connecting sleeve and flange one to squeeze the clamping sleeve, while the tail of the bolt pushes the connecting sleeve closer to the clamping sleeve, creating a force between them. This causes the clamping sleeve to deform and contract, gripping the heating end and the drive shaft respectively, thus fixing the ferrule to both. Therefore, the connecting bushing connected to the ferrule by the bolt and nut is fixed to the main shaft. Loosen the bolt and nut, remove it, and move the connecting sleeve away from the clamping sleeve. Then the ferrule and bushing can be removed.

[0010] Preferably, the outer wall of the bushing at the opening at the other end away from the flange is provided with a wedge-shaped surface, and the side wall of the step is provided with a groove that matches the wedge-shaped surface of the bushing, and the end of the bushing with the wedge-shaped surface passes into the groove, with the inner wall of the groove in contact with the wedge-shaped surface.

[0011] By adopting the above technical solution, the contact area between the bushing and the spindle is increased, which can improve the sealing and connection effect of both.

[0012] Alternatively, the ferrule and bushing can be connected by another method, in which multiple axial threaded holes are made on the outer wall of the connecting sleeve, and the bolt end is passed through flange one and flange two and then into the threaded holes of the connecting sleeve.

[0013] Using the above technical solution, when the bolt is tightened, the bolt will move deeper into the threaded hole of the connecting sleeve. When the tail of the bolt contacts the flange, the thread and tail of the bolt will pull the flange and the connecting sleeve to squeeze the clamping sleeve, and the movement of the connecting sleeve will cause the clamping sleeve to deform, thus gripping the heating end and the drive shaft, thereby fixing the ferrule and bushing on the drive shaft. Similarly, when the bolt is tightened in the opposite direction, the bolt will push the connecting sleeve away from the clamping sleeve. After the bolt is unscrewed, the ferrule and bushing can be removed.

[0014] Preferably, a rubber ring is provided between the wedge-shaped surface of the bushing and the inner wall of the slot of the spindle.

[0015] By adopting the above technical solution, the sealing between the bushing and the spindle is further improved, while preventing mutual wear between the two. Attached Figure Description

[0016] Figure 1 This is a side view of an embodiment;

[0017] Figure 2 This is a schematic diagram of the embodiment.

[0018] Figure 3 This is a schematic cross-sectional view along line AA of the embodiment;

[0019] Figure 4 This is an exploded view diagram of an embodiment;

[0020] Figure 5 This is an enlarged view of point A;

[0021] Figure 6 This is a schematic diagram illustrating another method of connecting the card sleeve.

[0022] Reference numerals in the attached diagram: 1. Drive shaft; 2. Transmission shaft; 3. Heating end; 4. Bushing; 5. Flange 1; 6. Connecting sleeve; 7. Anchor sleeve; 8. Flange 2; 9. Bolt; 10. Nut; 11. Rubber ring. Detailed Implementation

[0023] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model should be considered within the protection scope of this utility model. It should also be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

[0024] See Figures 1 to 5A paddle shaft for a paddle dryer includes a drive shaft 1, which comprises a main shaft, a transmission shaft 2, a heating end 3, and a central tube. The heating end 3 and the transmission shaft 2 pass through the main shaft from both ends, respectively. The central tube passes through the main shaft and through the heating end 3 and the transmission end. The outer diameter of the middle section of the main shaft is larger than the outer diameter of its two ends, forming two steps between the larger outer diameter section and the two smaller outer diameter sections. A bushing 4 is fitted on the outer wall of the main shaft at the lower surface of the steps. A flange 5 is integrally formed at the opening of one end of the bushing 4 away from the side wall of the steps, and a wedge-shaped surface is provided on the outer wall of the other end. A groove matching the wedge-shaped surface of the bushing 4 is provided on the side wall of the steps. A sealing ring is embedded in the groove, and the end of the bushing 4 with the wedge-shaped surface is inserted into the groove, with the wedge-shaped surface of the bushing 4 in contact with the sealing ring. It also includes two ferrules, which are respectively fitted onto the drive shaft 2 and the heating end 3. Each ferrule includes a connecting sleeve 6 and a retaining sleeve 7. The retaining sleeve 7 is frustoconical and elastic. The connecting sleeve 6 has a wedge-shaped surface inside that matches the outer wall of the retaining sleeve 7. The smaller opening end of the retaining sleeve 7 penetrates into the connecting sleeve 6, and the outer wall of the retaining sleeve 7 contacts the inner wall of the connecting sleeve 6. A flange 2 8 is integrally formed on the outer wall of the larger opening end of the retaining sleeve 7. The retaining sleeve 7 is located between the bushing 4 and the connecting sleeve 6, and flange 1 5 contacts flange 2 8. It also includes bolts 9 and nuts 10. Bolts 9 horizontally pass through flange 2 8, connecting sleeve 6, and flange 2 8. Nuts 10 are threaded onto bolts 9. Flange 2 8, connecting sleeve 6, and flange 2 8 are located between the nut 10 and the tail of bolt 9.

[0025] See Figure 6 Alternatively, the ferrule and bushing 4 can be connected by another method. Multiple axial threaded holes are opened on the outer wall of the connecting sleeve 6, and the end of the bolt 9 is inserted into the threaded hole of the connecting sleeve 6 after passing through the flange 1 5 and the flange 2 8.

[0026] Working principle: The ferrule and bushing 4 are respectively fitted onto the main shaft, heating end 3, and drive shaft 2, and the flange 8 of the clamping sleeve 7 is brought into contact with flange 5. Bolt 9 is passed through the connecting sleeve 6 and the contacting flanges 5 and 8, with the tail and end of bolt 9 close to the connecting sleeve 6 and flange 5 respectively. Nut 10 is screwed onto bolt 9, and then both are tightened. Nut 10 and the tail of bolt 9 push the connecting sleeve 6 and flange 5 to compress the clamping sleeve 7, while the tail of bolt 9 pushes the connecting sleeve 6 closer to the clamping sleeve 7. The moving outer wall of the clamping sleeve 7 exerts a force on the inner wall of the connecting sleeve 6, causing the clamping sleeve 7 to deform and contract, reducing its diameter and gripping the heating end 3 and drive shaft 2, thus fixing the ferrule to both. Therefore, the connecting bushing 4, connected to the ferrule by bolt 9 and nut 10, is fixed to the main shaft. When the spindle is connected to the housing, bushing 4 contacts the housing, and the rotating shaft drives bushing 4 to rotate. The rotating shaft is protected by bushing 4 and will not be worn by the housing. Loosen bolt 9 and nut 10 to remove them, and the movable connecting sleeve 6 will move away from the clamping sleeve 7. The distance between the clamping sleeve 7 and the connecting sleeve 6 increases, and the force between them gradually decreases. The clamping sleeve 7 returns to its original shape, and the diameter of the hole increases. The force exerted by the clamping sleeve 7 on the drive shaft 2 and the heating end 3 decreases. Then, the ferrule and bushing 4 can be removed, and bushing 4 can be replaced. This is to prevent the failure to replace bushing 4 in time after it wears out, which would affect the stability of the spindle rotation.

Claims

1. A paddle shaft for a paddle dryer, comprising a drive shaft (1), the drive shaft (1) comprising a main shaft, a transmission shaft (2), a heating end (3), and a central tube, wherein the heating end (3) and the transmission shaft (2) respectively pass into the main shaft from both ends, the central tube passes through the main shaft and through the heating end (3) and the transmission end, the outer diameter of the middle section of the main shaft is larger than the outer diameter of its two ends, the larger outer diameter section forms two steps between the two smaller outer diameter sections, a bushing (4) is fitted on the outer wall of the main shaft at the lower surface of the steps, a flange (5) is integrally formed at the end opening of the bushing (4) away from the side wall of the steps, and further comprising two retaining sleeves, the two retaining sleeves respectively fitted on On the drive shaft (2) and the heating end (3), the ferrule includes a connecting sleeve (6) and a clamping sleeve (7). The clamping sleeve (7) is frustoconical and elastic. The connecting sleeve (6) has a wedge-shaped surface inside that matches the outer wall of the clamping sleeve (7). The end of the clamping sleeve (7) with a smaller opening goes into the interior of the connecting sleeve (6), and the outer wall of the clamping sleeve (7) contacts the inner wall of the connecting sleeve (6). The outer wall of the end of the clamping sleeve (7) with a larger opening is integrally formed with a flange two (8). The clamping sleeve (7) is located between the bushing (4) and the connecting sleeve (6). The flange one (5) contacts the flange two (8). The ferrule and the bushing (4) are connected by a connector.

2. The blade shaft of a paddle dryer according to claim 1, characterized in that, The connecting components are bolts (9) and nuts (10). The bolts (9) pass horizontally through flange two (8), connecting sleeve (6) and flange two (8). The nuts (10) are threaded onto the bolts (9). Flange two (8), connecting sleeve (6) and flange two (8) are located between the nut (10) and the tail of the bolt (9).

3. The blade shaft of a paddle dryer according to claim 1, characterized in that, The outer wall of the bushing (4) at the other end opening away from the flange is provided with a wedge-shaped surface. The side wall of the step is provided with a groove that matches the wedge-shaped surface of the bushing (4). The end of the bushing (4) with the wedge-shaped surface is inserted into the groove, and the inner wall of the groove is in contact with the wedge-shaped surface.

4. The blade shaft of a paddle dryer according to claim 1 or 2, characterized in that, Alternatively, the ferrule and bushing (4) can be connected by another connection method. Multiple axial threaded holes are opened on the outer wall of the connecting sleeve (6). The end of the bolt (9) is passed through flange one (5) and flange two (8) and then inserted into the threaded hole of the connecting sleeve (6).

5. The blade shaft of a paddle dryer according to claim 1, characterized in that, A rubber ring (11) is provided between the wedge-shaped surface of the bushing (4) and the inner wall of the slot of the spindle.

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