A double-cone dryer of coil type

Abstract

The present application belongs to the field of double-cone drying machine, and particularly relates to a coil pipe type double-cone drying machine, which comprises a rack, a tank body is installed on the upper part of the rack through a bearing seat, a spiral coil pipe is arranged on the outer side of the tank body, a water supply pipe is arranged on the outer side of the spiral coil pipe, a water inlet and outlet hollow shaft seat is arranged on the right end of the tank body, one end of the water supply pipe is connected with the water inlet and outlet hollow shaft seat, an outer end of the water inlet and outlet hollow shaft seat is installed with a water inlet and outlet hollow shaft through a bearing, and an outer end of the water inlet and outlet hollow shaft is fixedly installed with a rotary joint. The spiral coil pipe is adopted to replace the traditional jacket, so that the tank body is not subjected to medium pressure, the whole machine does not belong to a pressure container, a series of special equipment supervision processes such as manufacturing supervision inspection, use registration, periodical inspection and installation notification are avoided, the compliance procedure is greatly simplified, the equipment delivery and production cycle is shortened, and the long-term operation and maintenance cost of the user is reduced.

Description

Technical Field

[0001] This invention relates to the field of double cone dryer technology, specifically a coil-type double cone dryer. Background Technology

[0002] In the chemical, pharmaceutical, and food industries, the double-cone rotary vacuum dryer is a widely used material drying equipment. Traditional double-cone dryers typically employ a jacketed structure, indirectly heating and drying the material inside the tank by introducing a heat medium such as steam, heat transfer oil, or hot water into the jacket. Although this type of equipment has been used for many years, it still has the following significant shortcomings in practical applications: Compliance and cost issues arising from pressure vessel regulation: When using gases such as steam as a heat source, the equipment is classified as a pressure vessel because its jacketed structure forms a closed pressure space. Its manufacturing process must be subject to special equipment supervision and inspection, it must be registered for use before being put into operation, and it must undergo regular inspections during operation. Furthermore, notification procedures must be followed during installation. This series of regulatory requirements not only makes the equipment manufacturing and use processes cumbersome and time-consuming, but also significantly increases the compliance and time costs for enterprises. Low heat transfer efficiency and uneven temperature distribution: In traditional jacketed structures, the inlet and outlet of the heat transfer medium are usually concentrated at one end of the tank's rotation axis. During actual circulation, the heat transfer medium easily "takes a shortcut" within the jacket cavity, meaning it mainly flows in the area near the inlet and outlet, while the flow is slow or even stagnant at the other end of the tank, far from the inlet and outlet. This results in significant differences in heating (or cooling) rates across different parts of the tank; the area near the heat source inlet heats up quickly, while the far end relies mainly on slow heat conduction, leading to uneven heating of the material, inconsistent drying effects, and low energy utilization. The cooling process suffers from the same drawbacks. Low levels of automation and continuous production: Existing double cone dryers generally lack high-precision positioning and stopping control systems. Due to inaccurate stopping positions, the feed inlet is difficult to precisely align with the outlet of the fixed upstream feed equipment when rotating upwards, and similarly, it is difficult to achieve a tight connection with the inlet of the downstream receiving equipment during discharge. Furthermore, the opening and closing of the feed inlet cover usually relies on manual operation or simple mechanical structures, making it impossible to achieve fully automated opening, closing, and sealing during the production process. These deficiencies severely restrict the application of the equipment in modern, continuous production lines, especially in Class A plants requiring high airtightness or unmanned operation. Therefore, improvements to existing technologies are necessary. Summary of the Invention

[0003] The purpose of this invention is to provide a coil-type double cone dryer that solves the problems of high requirements for pressure vessel manufacturing, low heating efficiency, and low degree of automation.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a coil-type double cone dryer, comprising a frame, a tank body mounted on the upper part of the frame via a bearing seat, a spiral coil disposed on the outer side of the tank body, a water supply pipe disposed on the outer side of the spiral coil, an inlet / outlet hollow shaft bearing seat disposed on the right end of the tank body, one end of the water supply pipe connected to the inlet / outlet hollow shaft bearing seat, an inlet / outlet hollow shaft mounted on the outer end of the inlet / outlet hollow shaft bearing seat via a bearing, a rotary joint fixedly mounted on the outer end of the inlet / outlet hollow shaft, an inlet / outlet water / air port disposed on the rotary joint, the inlet / outlet water / air port being connected to an external water pipe and a steam pipe via pipes, an insulation layer disposed on the outer side of the tank body, and a feed inlet cover hinged to the outer side of the feed inlet of the tank body. A vacuum tube hollow shaft seat is provided at the left end of the tank. The vacuum tube hollow shaft is mounted on the outer end of the vacuum tube hollow shaft seat via a bearing. A vacuum tube is installed inside the vacuum tube hollow shaft. A thermal resistor is installed inside the vacuum tube. A main shaft brake pulley is fixedly installed on the outer side of the vacuum tube hollow shaft. A large sprocket is fixedly installed on the main shaft brake pulley. A reducer is fixedly installed inside the frame. A small sprocket is fixedly installed on the outer side of the output shaft of the reducer. A large pulley is fixedly installed on the outer side of the input shaft of the reducer. A drive motor is fixedly installed inside the frame. A small pulley is fixedly installed on the outer side of the output shaft of the drive motor. A drain valve is fixedly installed on the outer side of the water supply pipe. A stainless steel sheath is provided on the outer side of the insulation layer.

[0005] Preferably, a photoelectric switch detection baffle is installed on the outer side of the stainless steel sheath. A feeding photoelectric switch fixing plate is fixedly installed on the upper end of the frame. A feeding photoelectric switch adjusting plate is installed on the feeding photoelectric switch fixing plate by bolts. A feeding photoelectric switch is installed on the feeding photoelectric switch adjusting plate. The position of the feeding photoelectric switch can be controlled by adjusting the position of the feeding photoelectric switch adjusting plate to achieve precise positioning of the tank during feeding. A discharging photoelectric switch fixing plate is fixedly installed on the upper end of the frame and on the side away from the feeding photoelectric switch. A discharging photoelectric switch adjusting plate is installed on the discharging photoelectric switch fixing plate by bolts. A discharging photoelectric switch can be installed on the discharging photoelectric switch adjusting plate. The position of the discharging photoelectric switch can be controlled by adjusting the position of the discharging photoelectric switch adjusting plate to achieve precise positioning of the tank during discharging. A sampling photoelectric switch fixing plate is installed on the upper end of the frame and below the feeding photoelectric switch. A sampling photoelectric switch is installed on the sampling photoelectric switch fixing plate. The photoelectric switch detection baffle can trigger the photoelectric switch.

[0006] Preferably, a vacuum filter is fixedly installed at one end of the vacuum tube inside the tank, and a fixing clamp is installed at the upper end of the vacuum tube on the frame, which is connected to the frame with a gap so that the concentricity and perpendicularity error between the vacuum tube and the bearing seat can be automatically adjusted when the tank rotates to prevent vacuum leakage. The fixing clamp is fixedly connected to the vacuum tube, and a sealing filler is provided at the connection between the vacuum tube and the tank.

[0007] Preferably, a drive belt is sleeved on the outer sides of the small pulley and the large pulley, and a chain is meshed on the outer sides of the large sprocket and the small sprocket. A protective cover is fixedly installed on the upper end of the frame, and the protective cover is located on the outer side of the large sprocket. The protective cover can protect the meshing part of the sprocket.

[0008] Preferably, a motor brake cylinder is hinged inside the frame, and a motor brake belt fixing strip is provided on the outer side of the output end of the motor brake cylinder. A motor brake belt is fixed on the motor brake belt fixing strip, one end of the motor brake belt fixing strip is hinged to the frame, and the motor brake belt contacts the annular groove of the small pulley. The motor brake belt can brake the motor.

[0009] Preferably, a spindle brake cylinder is provided inside the frame, and a spindle brake belt fixing strip is fixedly installed on the outer side of the output end of the spindle brake cylinder. One end of the spindle brake belt fixing strip is hinged to the frame, and a spindle brake belt is fixedly installed on the spindle brake belt fixing strip. The spindle brake belt contacts the annular groove of the spindle brake pulley, and the spindle brake belt can brake the spindle brake pulley.

[0010] Preferably, an inspection door is bolted to the lower end of the tank, and a sampling port is provided at the center of the lower end of the inspection door. A sampling valve is provided on the outside of the sampling port, and sampling can be performed by opening the sampling valve.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses a spiral coil instead of a traditional jacket, so that the tank body does not bear the pressure of the medium and the whole machine is not a pressure vessel. This eliminates a series of special equipment supervision processes such as manufacturing supervision and inspection, use registration, periodic inspection and installation notification, greatly simplifies compliance procedures, shortens the equipment delivery and commissioning cycle, and reduces the user's long-term operation and maintenance costs.

[0012] 2. This invention uses a spiral coil to form a forced flow channel, eliminating the "shortcut" phenomenon of hot / cold media, and ensuring that heat or cold energy can be uniformly transferred along the entire surface of the tank. This not only solves the persistent problems of slow heating and cooling at the far end of the traditional structure, making the material heated more evenly and the drying quality more stable, but also reduces energy waste and achieves a highly efficient and energy-saving drying and cooling process.

[0013] 3. This invention, through the synergy of a two-stage braking system and a photoelectric positioning switch, enables rapid and precise stopping at three workstations: feeding, discharging, and inspection / sampling. Combined with the automatic opening and closing of the material inlet cover and a vacuum adsorption sealing mechanism, it fully realizes a complete automated cycle of "feeding-sealing and drying-cooling-discharging-resetting." This system fundamentally overcomes the limitations of traditional equipment, such as inaccurate docking and reliance on manual operation, meeting the stringent requirements of modern production lines, especially Class A explosion-proof workshops, for automated, continuous, and even unmanned operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 The left view; Figure 3 For the present invention Figure 1 Top view; Figure 4 For the present invention Figure 1 Front view of the spiral coil; Figure 5 For the present invention Figure 4 The right view.

[0015] In the diagram: 1. Frame; 2. Tank; 3. Spiral coil; 4. Rotary joint; 5. Inlet / outlet water / air port; 6. Water supply pipe; 7. Drain valve; 8. Material inlet cover; 9. Insulation layer; 10. Stainless steel sheath; 11. Vacuum tube; 12. Vacuum filter; 13. Fixing clamp; 14. Large sprocket; 15. Chain; 16. Reducer; 17. Small sprocket; 18. Large pulley; 19. Drive motor; 20. Small pulley; 21. Drive belt; 22. Motor brake cylinder; 23. Motor brake belt fixing strip; 231. Motor brake belt; 24. Main shaft brake cylinder; 25. Main shaft brake belt fixing strip; 251. Main shaft brake belt; 26. Protective cover; 27. 28. Inspection door; 29. ​​Sampling port; 30. Sampling valve; 31. Resistance temperature detector (RTD); 32. Photoelectric switch detection baffle; 33. Feeding photoelectric switch fixing plate; 34. Feeding photoelectric switch adjusting plate; 35. Feeding photoelectric switch; 36. Sampling photoelectric switch fixing plate; 37. Sampling photoelectric switch; 38. Inlet / outlet hollow shaft seat; 39. Inlet / outlet hollow shaft; 30. Vacuum tube hollow shaft seat; 31. Vacuum tube hollow shaft; 32. Main shaft brake pulley; 33. Discharge photoelectric switch fixing plate; 34. Discharge photoelectric switch adjusting plate; 35. Discharge photoelectric switch; 36. Upper water receiving tray; 47. Water receiving pipe; 48. Lower water receiving tray; 49. Drain outlet. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1-5 A coil-type double cone dryer includes a frame 1. A tank 2 is mounted on the upper part of the frame 1 via a bearing seat. A spiral coil 3 is arranged on the outer side of the tank 2, and a water supply pipe 6 is arranged on the outer side of the spiral coil 3. An inlet / outlet hollow shaft bearing 34 is arranged at the right end of the tank 2. One end of the water supply pipe 6 is connected to the inlet / outlet hollow shaft bearing 34. An inlet / outlet hollow shaft 341 is mounted on the outer end of the inlet / outlet hollow shaft bearing 34 via a bearing. A rotary joint 4 is fixedly installed, and the rotary joint 4 is provided with water and air inlets and outlets 5. The water and air inlets and outlets 5 are connected to external water pipes and steam pipes. An upper water receiving pan 38 is provided at the upper end of the frame 1 below the rotary joint 4, a water receiving pipe 39 is provided in the middle, and a lower water receiving pan 40 is provided at the bottom of the lower end. A drain outlet 41 is provided outside the lower water receiving pan so that water can be discharged to the external pipe after the rotary joint 4 wears and leaks during long-term operation, thus protecting the site environment and the internal valves of the frame 1. The tank body 2 is provided with an insulation layer 9 on the outside. The feed port of the tank body 2 is hinged with a feed port cover 8. The left end of the tank body 2 is provided with a vacuum tube hollow shaft seat 35. The outer end of the vacuum tube hollow shaft seat 35 is equipped with a vacuum tube hollow shaft 351 through a bearing. A vacuum tube 11 is installed inside the vacuum tube hollow shaft 351. A thermal resistor 30 is installed inside the vacuum tube 11. A main shaft brake pulley 36 is fixedly installed on the outside of the vacuum tube hollow shaft 351. A large sprocket 14 is fixedly installed on the main shaft brake pulley 36. A reducer 16 is fixedly installed inside the frame 1. A small sprocket 17 is fixedly installed on the outside of the output shaft of the reducer 16. A large pulley 18 is fixedly installed on the outside of the input shaft of the reducer 16. A drive motor 19 is fixedly installed inside the frame 1. A small pulley 20 is fixedly installed on the outside of the output shaft of the drive motor 19. A drain valve 7 is fixedly installed on the outside of the water supply pipe 6. The insulation layer 9 is provided with a stainless steel sheath 10.

[0018] Please see Figure 1-5A photoelectric switch detection baffle 31 is installed on the outside of the stainless steel sheath 10. A feeding photoelectric switch fixing plate 32 and a discharging photoelectric switch fixing plate 37 are fixedly installed on the upper end of the frame 1. A feeding photoelectric switch adjusting plate 321 is installed on the feeding photoelectric switch fixing plate 32 by bolts. A feeding photoelectric switch 322 is installed on the feeding photoelectric switch adjusting plate 321. The position of the feeding photoelectric switch 322 can be controlled by adjusting the position of the feeding photoelectric switch adjusting plate 321 to achieve precise positioning of the tank 2 during feeding. A discharging photoelectric switch adjusting plate 371 is installed on the discharging photoelectric switch fixing plate 37 by bolts. A discharging photoelectric switch 372 is installed on the discharging photoelectric switch adjusting plate 371. The position of the discharging photoelectric switch 372 can be controlled by adjusting the position of the discharging photoelectric switch adjusting plate 371 to achieve precise positioning of the tank (2) during discharging. The upper end of the frame 1 and the position A sampling photoelectric switch fixing plate 33 is installed below the feeding photoelectric switch 322. A sampling photoelectric switch 331 is installed on the sampling photoelectric switch fixing plate 33. The photoelectric switch detection baffle 31 can trigger the photoelectric switch. A vacuum filter screen 12 is fixedly installed at one end of the vacuum tube 11 inside the tank 2. A fixing clamp 13 is installed at the upper end of the vacuum tube 11 on the frame 1. It is connected to the frame and a gap is left so that the concentricity and perpendicularity error between the vacuum tube 11 and the bearing seat can be automatically adjusted when the tank 2 rotates to prevent vacuum leakage. A sealing packing is provided at the connection between the vacuum tube 11 and the tank 2. The drive belt 21 is sleeved on the outer side of the small pulley 20 and the large pulley 18. The chain 15 is meshed on the outer side of the large sprocket 14 and the small sprocket 17. A protective cover 26 is fixedly installed at the upper end of the frame 1. The protective cover 26 is located on the outer side of the large sprocket 14. The protective cover 26 can protect the meshing part of the sprocket.

[0019] Please see Figure 1-5 The frame 1 has a motor brake cylinder 22 hinged inside. A motor brake belt fixing strip 23 is provided on the outer side of the output end of the motor brake cylinder 22. A motor brake belt 231 is fixed on the motor brake belt fixing strip 23. The motor brake belt 231 contacts the small pulley 20. One end of the motor brake belt fixing strip 23 is hinged to the frame 1. The motor brake belt 231 contacts the annular groove of the small pulley 20. The motor brake belt 231 can brake the motor. The frame 1 also has a main shaft brake cylinder 24 inside. A motor brake belt fixing strip 24 is provided on the outer side of its output end. There is a main shaft brake belt fixing strip 25, one end of which is hinged to the frame 1. A main shaft brake belt 251 is fixedly installed on the main shaft brake belt fixing strip 25. The main shaft brake belt 251 contacts the annular groove of the main shaft brake pulley 36. The main shaft brake belt 251 can brake the main shaft brake pulley 36. A maintenance door 27 is bolted to the lower end of the tank body 2. A sampling port 28 is provided at the center of the lower end of the maintenance door 27. A sampling valve 29 is provided on the outside of the sampling port 28. Sampling can be performed by opening the sampling valve 29.

[0020] The specific implementation process of this invention is as follows: I. Heating / Cooling Principle: A heat source, such as high-temperature steam, or a cold source, such as cooling water, enters the semi-circular spiral coil 3 welded to the outer wall of the tank 2 through a rotary joint 4 and a water supply pipe 6. The medium flows in a forced manner within the spiral coil 3, and its heat or cold is indirectly transferred to the material inside the tank through the wall of the tank 2. A drain valve 7 is used to discharge condensate or cooled medium. During the drying process, a vacuum is continuously drawn into the tank through a vacuum pipe 11 to lower the boiling point of water and accelerate moisture evaporation. A vacuum filter 12 prevents the material from being extracted. An insulation layer 9 and a stainless steel sheath 10 cover the outside of the spiral coil 3, effectively reducing the loss of heat and cold. II. Principles of Material Mixing: The drive motor 19 drives the reducer 16 through the belt drive small pulley 20, large pulley 18 and drive belt 21, and then drives the tank 2 to rotate slowly and continuously around its horizontal axis through the chain drive small sprocket 17, large sprocket 14 and chain 15. The rotation of the tank 2 causes the material inside to be continuously lifted, tumbled and slid down, realizing dynamic mixing and ensuring that all materials can fully contact the heated wall surface. III. Principle of Automated Operation Cycle: 1) Feeding stage: The control system starts and the drive motor 19 drives the tank 2 to rotate. When the material port of the tank 2 is directly above, the feeding photoelectric switch 322 controls the motor brake cylinder 22 and the main shaft brake cylinder 24 to act simultaneously. Through the motor brake belt 231 and the main shaft brake belt 251, the drive system and the main shaft are quickly braked and the tank 2 stops precisely. The material port cover 8 is automatically opened at this position due to gravity. After the upper feeding equipment is connected, automatic feeding begins. 2) Drying stage: After feeding is completed, the upper equipment is disengaged, the cover cylinder is activated, and the material port cover 8 is pushed to close. Vacuum is drawn inside the tank through the vacuum tube 11. Under the action of negative pressure and gravity, the material port cover 8 is tightly adsorbed and sealed. At the same time, high-temperature steam is introduced into the spiral coil 3 for heating. The tank body 2 continues to rotate and the vacuum drying process begins. After drying reaches the standard, the medium in the spiral coil 3 is switched to cooling water to uniformly cool the material. The tank body 2 continues to rotate. 3) Discharge stage: After cooling is completed, the tank body 2 is rotated so that the material outlet faces directly downward. The discharge photoelectric switch 372 is triggered, and the brake is applied again. After the lower discharge equipment is connected, the vacuum breaking valve on the external vacuum channel is opened, the tank returns to normal pressure, and the material outlet cover 8 opens automatically under the action of gravity, and the material is automatically discharged. 4) Inspection and sampling: The equipment is equipped with an inspection door 27 and a sampling port 28. When inspection or sampling is required, the tank body 2 can be rotated to a position where the inspection and sampling port 28 is located at an angle below through the control system. When this position is reached, the sampling photoelectric switch 331 will respond and brake precisely. The sampling valve 29 can then be opened to perform the sampling operation, or the inspection door 27 can be opened to enter the tank body 2 for inspection.

[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coil-type double cone dryer, comprising a frame (1), characterized in that: The upper part of the frame (1) is equipped with a tank (2) via a bearing seat. A spiral coil (3) is provided on the outside of the tank (2). A water supply pipe (6) is provided on the outside of the spiral coil (3). A hollow water inlet / outlet shaft seat (34) is provided at the right end of the tank (2). One end of the water supply pipe (6) is connected to the hollow water inlet / outlet shaft seat (34). The outer end of the hollow water inlet / outlet shaft seat (34) is equipped with a hollow water inlet / outlet shaft (341) via a bearing. A rotary joint (4) is fixedly installed on the outer end of the hollow water inlet / outlet shaft (341). The rotary joint (4) is provided with a water inlet / outlet air outlet (5). The water inlet / outlet air outlet (5) is connected to an external water pipe and a steam pipe by a pipe. An insulation layer (9) is provided on the outer side of the tank body (2). A feed port cover (8) is hinged to the outer side of the feed port of the tank body (2). A vacuum tube hollow shaft seat (35) is provided on the left end of the tank body (2). (35) The outer end of the vacuum tube hollow shaft (351) is installed with a bearing. The vacuum tube hollow shaft (351) is equipped with a vacuum tube (11). The vacuum tube (11) is equipped with a thermal resistor (30). The vacuum tube hollow shaft (351) is fixedly installed with a main shaft brake pulley (36). The main shaft brake pulley (36) is fixedly installed with a large sprocket (14). The frame (1) is fixedly installed with a reducer (16). The output shaft of the reducer (16) is fixedly installed with a small sprocket (17). The input shaft of the reducer (16) is fixedly installed with a large pulley (18). The frame (1) is fixedly installed with a drive motor (19). The output shaft of the drive motor (19) is fixedly installed with a small pulley (20). The water supply pipe (6) is fixedly installed with a drain valve (7). The insulation layer (9) is equipped with a stainless steel sheath (10).

2. The coil-type double cone dryer according to claim 1, characterized in that: A photoelectric switch detection baffle (31) is installed on the outside of the stainless steel sheath (10). Two feed photoelectric switch fixing plates (32) and discharge photoelectric switch fixing plates (37) are fixedly installed on the upper end of the frame (1). A feed photoelectric switch adjusting plate (321) is installed on the feed photoelectric switch fixing plate (321) by bolts. A feed photoelectric switch (322) is installed on the feed photoelectric switch adjusting plate (321). A discharge photoelectric switch adjusting plate (371) is installed on the discharge photoelectric switch fixing plate (371) by bolts. A discharge photoelectric switch (372) is installed on the discharge photoelectric switch adjusting plate (371). A sampling photoelectric switch fixing plate (33) is installed on the upper end of the frame (1) and below the feed photoelectric switch (322). A sampling photoelectric switch (331) is installed on the sampling photoelectric switch fixing plate (33).

3. The coil-type double cone dryer according to claim 1, characterized in that: A vacuum filter (12) is fixedly installed at one end of the vacuum tube (11) inside the tank (2). A fixing clip (13) is installed at the upper end of the frame (1). The fixing clip (13) is fixedly connected to the vacuum tube (11). A sealing filler is provided at the connection between the vacuum tube (11) and the tank (2).

4. The coil-type double cone dryer according to claim 1, characterized in that: The small pulley (20) and the large pulley (18) are connected together by a drive belt (21), and the large sprocket (14) and the small sprocket (17) are connected together by a chain (15). A protective cover (26) is fixedly installed on the upper end of the frame (1), and the protective cover (26) is located on the outside of the large sprocket (14).

5. A coil-type double cone dryer according to claim 1, characterized in that: The frame (1) is internally hinged with a motor brake cylinder (22). A motor brake belt fixing strip (23) is provided on the outer side of the output end of the motor brake cylinder (22). A motor brake belt (231) is fixed on the motor brake belt fixing strip (23). The motor brake belt (231) is in contact with the small pulley (20). One end of the motor brake belt fixing strip (23) is hinged to the frame (1). The motor brake belt (231) is in contact with the annular groove of the small pulley (20).

6. A coil-type double cone dryer according to claim 1, characterized in that: The frame (1) is equipped with a spindle brake cylinder (24). A spindle brake belt fixing strip (25) is fixedly installed on the outer side of the output end of the spindle brake cylinder (24). One end of the spindle brake belt fixing strip (25) is hinged to the frame (1). A spindle brake belt (251) is fixedly installed on the spindle brake belt fixing strip (25). The spindle brake belt (251) is in contact with the annular groove of the spindle brake pulley (36).

7. A coil-type double cone dryer according to claim 1, characterized in that: The lower end of the tank (2) is fitted with an inspection door (27) by bolts. A sampling port (28) is provided at the center of the lower end of the inspection door (27). A sampling valve (29) is provided on the outside of the sampling port (28).

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