High-efficiency heating hollow shaft of rake dryer and liquid discharge method thereof

Abstract

The application discloses a high-efficiency heating hollow shaft of a rake dryer and a liquid discharging method thereof, and belongs to the technical field of dryers. The high-efficiency heating hollow shaft of the rake dryer solves the defects of poor heat medium circulation or circulation dead angle of a main shaft of a traditional rake dryer in the prior art after the heat medium is introduced into the main shaft. The main structure comprises a rack, a shell and a motor arranged on the rack, a heating hollow shaft arranged in the shell, a transmission assembly for rotationally connecting the motor and the heating hollow shaft, and two ends of the heating hollow shaft rotatably installed on a support. The heating hollow shaft comprises a main shaft hollow pipe, hollow end shafts arranged at two ends of the main shaft hollow pipe, a driving end shaft, a heat medium inlet pipe installed and penetrating through the hollow end shafts and the main shaft hollow pipe, and more than one hollow rake tooth arranged outside the main shaft hollow pipe. The application is mainly used on the rake dryer.

Description

Technical Field

[0001] This invention belongs to the field of dryer technology, and more specifically, relates to a high-efficiency heating hollow shaft for a rake dryer and a method for draining liquid from it. Background Technology

[0002] Rake dryers are widely used in pharmaceuticals, chemicals, dyes, pesticides, and food industries. They are suitable for slurries, pastes, and powders, as well as heat-sensitive materials requiring low-temperature drying, and easily oxidized, explosive, highly irritating, and highly toxic materials. The material to be dried is added from the top of the shell. Under the continuous forward and reverse rotation of the rake teeth, the material moves axially back and forth, constantly renewing the surface in contact with the inner wall of the shell. Indirect heating by steam and uniform stirring by the rake teeth facilitate the removal of surface moisture / solvent. The vaporized moisture / solvent is condensed and released from the vacuum pump outlet. The dried material is directly discharged from the bottom and bagged. A certain temperature needs to be maintained during the drying process in a rake dryer, requiring heating of the dryer. The heat medium can be heated through the external jacket of the dryer, but to improve heating efficiency, a hollow shaft is needed to increase the heat exchange area. After the heat medium is introduced into the main shaft of the dryer, poor circulation or dead zones may occur, especially since the individual rake teeth cannot circulate efficiently, creating dead zones. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for efficient heating of hollow shaft of rake dryer and its drainage. It can not only timely drain the condensate in the hollow rake teeth without backflow, but also timely drain the condensate inside the hollow tube of the main shaft. This improves the circulation efficiency of the heat medium and the heating efficiency of the hollow tube of the main shaft, improves the utilization rate of the heat medium, saves energy and reduces consumption, and at the same time improves the working efficiency of the dryer and ensures the quality of the dried material.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A high-efficiency heating hollow shaft for a rake dryer includes a frame, a housing and a motor mounted on the frame, a heating hollow shaft housed inside the housing, and the motor rotatably connected to the heating hollow shaft via a transmission assembly. The two ends of the heating hollow shaft are rotatably mounted on supports. The heating hollow shaft includes a main shaft hollow tube, hollow end shafts and a drive end shaft located at both ends of the main shaft hollow tube, and a heat medium inlet pipe installed and passing through the hollow end shafts and the main shaft hollow tube. The outside of the main shaft hollow tube is provided with one or more hollow rake teeth.

[0006] Preferably, a flow guide and drainage hopper is provided between the hollow end shaft and the heat medium inlet pipe.

[0007] Preferably, the guide drainage bucket includes a water tank baffle, an arc-shaped plate disposed on the arc-shaped side of the water tank baffle, and a first guide plate and a second guide plate disposed on the side of the water tank baffle. The two ends of the water tank baffle are in contact with the inner wall of the main shaft hollow tube. A liquid inlet cavity is formed between the concave surface of the water tank baffle and the inner wall of the main shaft hollow tube. A first liquid storage cavity is formed between the first guide plate, the water tank baffle, and the arc-shaped plate. A second liquid storage cavity is formed between the second guide plate, the water tank baffle, and the arc-shaped plate.

[0008] Preferably, a drain hole is provided inside the hollow end shaft, and both the first liquid storage chamber and the second liquid storage chamber are connected to the drain hole.

[0009] Preferably, the water tank baffle has a crescent-shaped structure.

[0010] Preferably, the end of the heat medium inlet pipe is equipped with a heat medium inlet and a heat medium outlet via a rotary joint, and the drain hole is connected to the heat medium outlet.

[0011] Preferably, the hollow rake tooth includes a hollow rake tooth tube and a rake blade welded to one end of the hollow rake tooth tube, and the other end of the hollow rake tooth tube is connected to the inner cavity of the main shaft hollow tube through a reducing joint.

[0012] Preferably, the heat medium inlet pipe is connected to the heat medium extension branch pipe through the heat medium branch pipe and the fixing screw seat, and the heat medium extension branch pipe extends into the interior of the rake tooth hollow pipe after passing through the reducing joint.

[0013] A method for draining liquid, using the above-mentioned rake dryer with high-efficiency heating of the hollow shaft, includes the following steps:

[0014] During normal operation of the dryer, steam enters the heat medium inlet pipe through the heat medium inlet and then passes through the heat medium branch pipes at the bottom of each straight-through rake tooth hollow tube before entering the hollow rake teeth. Condensate will form during the drying process. Steam and condensate exit through reducing joints and then converge into the inner cavity of the main shaft hollow tube. This structure ensures that the heat medium circulates without dead zones within the hollow rake teeth, and the condensate is discharged promptly, resulting in uniform overall heating. Reducing joints are welded at the openings of the main shaft hollow tubes to guide the condensate / heat medium flow. The reducing joints employ a conical structure to facilitate the condensate flow. The condensate collected in the hollow main shaft tube is easily discharged. Due to the height difference of the reducing joint, the condensate will not flow back into the hollow rake teeth, thus affecting heat exchange. This serves as a guide and prevents backflow. If condensate is present in the hollow main shaft tube, it will affect the heat exchange of the hollow main shaft tube. Therefore, it is necessary to clean the condensate in the hollow main shaft tube at any time. A guide drain is added between the hollow main shaft tube and the heat medium inlet pipe. The condensate collected in the hollow main shaft tube is discharged through the guide drain and the heat medium outlet when the hollow shaft is heated and rotated, which improves the heat exchange efficiency of the hollow main shaft tube.

[0015] Preferably, the condensate collected from the hollow tube of the main shaft is discharged through the guide drain bucket when the heated hollow shaft rotates:

[0016] The condensate collected in the hollow tube of the main shaft enters the inlet chamber through the concave surface of the water tank baffle and the inner wall of the hollow tube when the heating hollow shaft rotates. It then flows out of the hollow tube quickly through the second and first guide plates. Since the heating hollow shaft rotates, the condensate flows into the drain hole through the first and / or second storage chambers with the cooperation of the second and first guide plates, ensuring no backflow. The heating hollow shaft can rotate in both directions, but the drainage of the guide drain is not affected by the rotation. When the first storage chamber rotates to a high point, the condensate that cannot flow out in time due to its large volume gathers in the second storage chamber. When the second storage chamber rotates to a certain height, the condensate flows out through the drain hole to the heat medium outlet. At the same time, the guide drain is filled with water again, and the cycle continues to rotate and drain the condensate.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. During normal operation of the dryer, steam enters the heat medium inlet pipe through the heat medium inlet, then passes through the heat medium branch pipes at the bottom of each straight-through rake tooth hollow tube before entering the hollow rake teeth. Condensate will appear during the drying process. Steam and condensate exit through reducing joints and then converge into the inner cavity of the main shaft hollow tube. This structure ensures that the heat medium circulates without dead zones within the hollow rake teeth, and the condensate is discharged promptly, resulting in uniform overall heating. Reducing joints are welded at the openings of the main shaft hollow tubes to guide the condensate / heat medium. The reducing joints employ a conical structure to facilitate the flow of condensate. The condensate collected in the hollow main shaft tube does not flow back into the hollow rake teeth due to the height difference of the reducing joint, thus playing a guiding and anti-backflow role. If there is condensate in the hollow main shaft tube, it will affect the heat exchange of the hollow main shaft tube, so it is necessary to clean the condensate in the hollow main shaft tube at any time. A guide drain bucket is added between the hollow main shaft tube and the heat medium inlet pipe. The condensate collected in the hollow main shaft tube is discharged through the guide drain bucket and the heat medium outlet when the hollow shaft is heated and rotated, which improves the heat exchange efficiency of the hollow main shaft tube.

[0019] 2. When the hollow heating shaft rotates, the condensate collected in the main shaft hollow tube enters the inlet chamber through the concave surface of the water tank baffle and the inner wall of the main shaft hollow tube. It then flows out of the main shaft hollow tube quickly through the second and first guide plates. Since the heating hollow shaft rotates, with the cooperation of the second and first guide plates, the condensate flows into the drain hole through the first and / or second storage chambers, ensuring no backflow. The heating hollow shaft can rotate in both directions, and the drainage of the guide drain bucket is not affected by the rotation. When the first storage chamber rotates to a high point, the condensate that cannot flow out in time due to excessive volume gathers in the second storage chamber. When the second storage chamber rotates to a certain height, the condensate flows out through the drain hole to the heat medium outlet. At the same time, the guide drain bucket is filled with water again. This cycle of rotation and condensate drainage solves the problem of poor condensate drainage from the main shaft hollow tube affecting heat exchange, and the heat medium circulation is seamless, improving heat exchange efficiency.

[0020] In summary, this invention can not only promptly discharge the condensate inside the hollow rake teeth without backflow, but also promptly discharge the condensate inside the hollow main shaft tube, thereby improving the circulation efficiency of the heat medium and the heating efficiency of the hollow main shaft tube, increasing the utilization rate of the heat medium, saving energy and reducing consumption, while also improving the working efficiency of the dryer and ensuring the quality of the dried material. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the heated hollow shaft in this invention;

[0023] Figure 3 for Figure 2 Sectional view of AA;

[0024] Figure 4 for Figure 2 Sectional view of BB;

[0025] Figure 5 for Figure 4 Schematic diagram of the structure in the C-direction;

[0026] Figure 6 This is a schematic diagram of the flow-guiding drainage bucket in this invention.

[0027] In the diagram: 1. Shell; 2. Support; 3. Frame; 4. Motor; 5. Transmission assembly; 6. Heating hollow shaft; 7. Rotary joint; 8. Heat medium inlet; 9. Heat medium outlet; 10. Heat medium inlet pipe; 11. Hollow end shaft; 12. Hollow rake teeth; 13. Main shaft hollow tube; 14. Rake tooth hollow tube; 15. Rake blade; 16. Heat medium extension branch pipe; 17. Reducing joint; 18. Drive end shaft; 19. Heat medium branch pipe; 20. Fixing screw seat; 21. Guide drainage hopper; 22. Liquid inlet chamber; 23. Second guide plate; 24. First liquid storage chamber; 25. Second liquid storage chamber; 26. Drain hole; 27. Water tank baffle; 28. First guide plate; 29. ​​Arc plate. Detailed Implementation

[0028] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0029] Example 1:

[0030] like Figure 1 , Figure 2As shown, a high-efficiency heating hollow shaft for a rake dryer includes a frame 3, a housing 1 and a motor 4 mounted on the frame 3, a heating hollow shaft 6 disposed inside the housing 1, and the motor 4 rotatably connected to the heating hollow shaft 6 via a transmission assembly 5. The two ends of the heating hollow shaft 6 are rotatably mounted on supports 2. The heating hollow shaft 6 includes a main shaft hollow tube 13, hollow end shafts 11 and drive end shafts 18 disposed at both ends of the main shaft hollow tube 13, and a heat medium inlet pipe 10 installed and passing through the hollow end shafts 11 and the main shaft hollow tube 13. The outside of the main shaft hollow tube 13 is provided with one or more hollow rake teeth 12.

[0031] Example 2:

[0032] like Figure 4 As shown, a rake dryer has a high-efficiency heating hollow shaft, wherein a guide drainage hopper 21 is provided between the hollow end shaft 11 and the heat medium inlet pipe 10.

[0033] like Figure 5 , Figure 6 As shown, the guide drainage hopper 21 includes a crescent-shaped water tank baffle 27, an arc plate 29 disposed on the arc-shaped side of the water tank baffle 27, and a first diversion plate 28 and a second diversion plate 23 disposed on the side of the water tank baffle 27. The two ends of the water tank baffle 27 are in contact with the inner wall of the main shaft hollow tube 13. A liquid inlet chamber 22 is formed between the concave surface of the water tank baffle 27 and the inner wall of the main shaft hollow tube 13. A first liquid storage chamber 24 is formed between the first diversion plate 28, the water tank baffle 27, and the arc plate 29. A second liquid storage chamber 25 is formed between the second diversion plate 23, the water tank baffle 27, and the arc plate 29.

[0034] The hollow end shaft 11 is provided with a drain hole 26, and both the first liquid storage chamber 24 and the second liquid storage chamber 25 are connected to the drain hole 26.

[0035] The end of the heat medium inlet pipe 10 is equipped with a heat medium inlet 8 and a heat medium outlet 9 via a rotary joint 7, and the drain hole 26 is connected to the heat medium outlet 9.

[0036] like Figure 3 As shown, the hollow rake tooth 12 includes a hollow rake tooth tube 14 and a rake blade 15 welded to one end of the hollow rake tooth tube 14. The other end of the hollow rake tooth tube 14 is connected to the inner cavity of the main shaft hollow tube 13 through a reducing joint 17. The weld between the hollow rake tooth tube 14 and the rake blade 15 is made into a flat opening shape to fully fit and increase strength and heat transfer surface. The heat medium inlet pipe 10 is connected to the heat medium extension branch pipe 16 through the heat medium branch pipe 19 and the fixing screw seat 20. The heat medium extension branch pipe 16 extends into the interior of the hollow rake tooth tube 14 after passing through the reducing joint 17.

[0037] Example 3:

[0038] A method for draining liquid, using a rake dryer with a high-efficiency heated hollow shaft as described in Example 2, includes the following steps:

[0039] The hollow shaft 6 of the dryer can use heating media such as steam, heat transfer oil, and water. Taking steam as an example, during normal operation of the dryer, steam enters the heat medium inlet pipe 10 through the heat medium inlet 8, then passes through the heat medium branch pipes 19 at the bottom of each straight-through rake tooth hollow tube 14, and finally enters the hollow rake tooth 12. During the drying process, condensate will appear. Steam and condensate exit through the reducer 17 and then flow into the inner cavity of the main shaft hollow tube 13. With this structure, the heat medium circulates without dead zones within the hollow rake tooth 12, and the condensate is discharged in a timely manner, resulting in uniform overall heating. The reducer 17 is welded at the opening of the main shaft hollow tube 13 to guide the condensate / heat medium. The reducing connector 17 has a conical structure to facilitate the outflow of condensate. The condensate collected in the hollow main shaft tube 13 will not flow back into the hollow rake teeth 12 due to the height difference of the reducing connector 17, thus playing a guiding and anti-backflow role. If there is condensate in the hollow main shaft tube 13, it will affect the heat exchange of the hollow main shaft tube 13, so it is necessary to clean the condensate in the hollow main shaft tube 13 at any time. A guide drain hopper 21 is added between the hollow main shaft tube 13 and the heat medium inlet pipe 10. The condensate collected from the hollow main shaft tube 13 is discharged through the guide drain hopper 21 and the heat medium outlet 9 when the heated hollow shaft 6 rotates, which improves the heat exchange efficiency of the hollow main shaft tube 13.

[0040] The condensate collected in the hollow tube 13 of the main shaft is discharged through the guide drain hopper 21 when the heated hollow shaft 6 rotates. The condensate enters the inlet chamber 22 through the concave surface of the water tank baffle 27 and the inner wall of the hollow tube 13, and then flows out of the hollow tube 13 quickly through the second guide plate 23 and the first guide plate 28. Since the heated hollow shaft 6 rotates, the condensate flows smoothly through the guide plate 23 and the first guide plate 28. The condensate flows into the drain hole 26 through the first storage chamber 24 and / or the second storage chamber 25, ensuring no backflow. The heating hollow shaft 6 can rotate in both directions, and the drainage of the guide drain hopper 21 is not affected by the rotation. When the first storage chamber 24 rotates to the highest point, the condensate that cannot flow out in time due to excessive volume gathers in the second storage chamber 25. When the second storage chamber 25 rotates to a certain height, the condensate flows out through the drain hole 26 and is discharged to the heat medium outlet 9. At the same time, the guide drain hopper 21 is filled with water again, and the condensate is discharged in this cycle.

Claims

1. A high-efficiency heating hollow shaft for a rake dryer, comprising a frame (3), on which a housing (1) and a motor (4) are mounted, characterized in that: The housing (1) is provided with a heating hollow shaft (6). The motor (4) is rotatably connected to the heating hollow shaft (6) through the transmission assembly (5). The two ends of the heating hollow shaft (6) are rotatably mounted on the support (2). The heating hollow shaft (6) includes a main shaft hollow tube (13), hollow end shafts (11) and drive end shafts (18) provided at both ends of the main shaft hollow tube (13), and a heat medium inlet pipe (10) installed and passing through the hollow end shafts (11) and the main shaft hollow tube (13). The main shaft hollow tube (13) is provided with one or more hollow rake teeth (12). A flow guide and drainage bucket (21) is provided between the hollow end shaft (11) and the heat medium inlet pipe (10). The drainage hopper (21) includes a water tank baffle (27), an arc plate (29) set on the arc side of the water tank baffle (27), a first drainage plate (28) and a second drainage plate (23) set on the side of the water tank baffle (27). The two ends of the water tank baffle (27) are in contact with the inner wall of the main shaft hollow tube (13). The concave surface of the water tank baffle (27) and the inner wall of the main shaft hollow tube (13) form an inlet cavity (22). The first drainage plate (28) forms a first liquid storage cavity (24) between the water tank baffle (27) and the arc plate (29). The second drainage plate (23) forms a second liquid storage cavity (25) between the water tank baffle (27) and the arc plate (29). The hollow end shaft (11) is provided with a drain hole (26), and the first liquid storage chamber (24) and the second liquid storage chamber (25) are both connected to the drain hole (26).

2. The high-efficiency heated hollow shaft of the rake dryer according to claim 1, characterized in that: The water tank baffle (27) has a crescent-shaped structure.

3. The high-efficiency heated hollow shaft of the rake dryer according to claim 2, characterized in that: The end of the heat medium inlet pipe (10) is equipped with a heat medium inlet (8) and a heat medium outlet (9) through a rotary joint (7), and the drain hole (26) is connected to the heat medium outlet (9).

4. The high-efficiency heated hollow shaft of the rake dryer according to claim 3, characterized in that: The hollow rake tooth (12) includes a hollow rake tooth tube (14) and a rake blade (15) welded to one end of the hollow rake tooth tube (14). The other end of the hollow rake tooth tube (14) is connected to the inner cavity of the main shaft hollow tube (13) through a reducing joint (17).

5. The high-efficiency heated hollow shaft of the rake dryer according to claim 4, characterized in that: The heat medium inlet pipe (10) is connected to the heat medium extension branch pipe (16) through the heat medium branch pipe (19) and the fixing screw seat (20). The heat medium extension branch pipe (16) extends into the interior of the rake tooth hollow pipe (14) after passing through the reducing joint (17).

6. A method for draining liquid, employing a rake dryer with a high-efficiency heated hollow shaft as described in claim 5, characterized in that: Includes the following steps: When the dryer is running normally, steam enters the heat medium inlet pipe (10) through the heat medium inlet (8) and then enters the hollow rake teeth (12) through the heat medium branch pipe (19) at the bottom of each straight rake tooth hollow tube (14). During the drying process, condensate will appear. Steam and condensate come out through the reducer (17) and then flow into the inner cavity of the main shaft hollow tube (13). The condensate collected from the main shaft hollow tube (13) is discharged through the guide drain bucket (21) and the heat medium outlet (9) when the heated hollow shaft (6) rotates.

7. The drainage method according to claim 6, characterized in that: The condensate collected from the hollow tube (13) of the main shaft is discharged through the guide drain (21) when the heated hollow shaft (6) rotates: The condensate collected in the hollow tube of the main shaft (13) enters the liquid inlet chamber (22) through the concave surface of the water tank baffle (27) and the inner wall of the hollow tube of the main shaft (13) when the heating hollow shaft (6) rotates. It then flows out of the hollow tube of the main shaft (13) quickly through the second guide plate (23) and the first guide plate (28). Since the heating hollow shaft (6) is rotating, with the cooperation of the second guide plate (23) and the first guide plate (28), the condensate flows into the drain hole (26) through the first storage chamber (24) and / or the second storage chamber (25). When the first storage chamber (24) rotates to a high point, the condensate that cannot flow out in time due to too much condensate is collected in the second storage chamber (25). When the second storage chamber (25) rotates to a certain height, the condensate flows out through the drain hole (26) to the heat medium outlet (9). At the same time, the guide drain bucket (21) is filled with water again. This cycle of rotation discharges the condensate.

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