A carbonizing rotary kiln

Abstract

The present invention relates to the technical field of rotary kilns, and specifically to a carbonizing rotary kiln, comprising a furnace body, a scraping mechanism and a frame; the furnace body comprises a furnace core and a furnace shell; the furnace core comprises a feed end and a discharge end; two parallel guide rails are provided on the inner wall of the furnace shell along the length direction; the scraping mechanism comprises a hydraulic push rod, a locker and a shaping unit, the hydraulic push rod is arranged on the frame and abuts against the feed end; the locker is arranged on the feed end; the shaping unit comprises a rope body, a winding machine and a pulley, the pulley and the winding machine are respectively arranged on two guide rails, the rope body starts from the winding machine and passes through the pulley to form a circle around the furnace core and then is connected to the winding machine; the present invention arranges multiple groups of shaping units so that the furnace core with a circular cross-section is squeezed into an elliptical shape. Due to the change in shape, the mechanical structure of the cylinder changes, and elastic deformation can easily occur under the extrusion of the hydraulic push rod. The release of the locker causes the accumulated energy to be instantly released to form rebound vibration to achieve "scraping the wall".

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kilns, in particular to a carbonization rotary kiln. Background Art

[0002] Activated carbon, a porous material, is widely used in water treatment, air purification, metal recovery, medicine, and other fields due to its large specific surface area and excellent adsorption properties. Carbonization and activation are key steps in the preparation of activated carbon, directly affecting its quality and performance.

[0003] In traditional carbonization rotary kilns, materials tend to adhere to the furnace shell, even causing clogging and silting. This not only affects the carbonization effect but also increases energy consumption and maintenance costs. To ensure the carbonization effect, various scraping mechanisms are required. This makes the already narrow space inside the carbonization rotary kiln even more cramped and the entire equipment structure extremely complex. For example, the carbonization rotary kiln disclosed in CN118999140B is extremely difficult to maintain, the carbonization volume is small, and the heat required to heat the entire scraping mechanism leads to low efficiency.

[0004] In view of this, research and improvement are conducted on the existing problems to provide a carbonization rotary furnace that can reduce the complexity of the equipment while ensuring that the material in the furnace is not easily adhered to the furnace shell. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a carbonization rotary furnace which can reduce the complexity of the equipment and ensure that the material in the furnace is not easily adhered to the furnace shell.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A carbonizing rotary kiln comprises a furnace body, a wall scraping mechanism and a frame;

[0008] The furnace body includes a motor, a furnace core, and a furnace shell. The furnace core is a cylindrical structure formed of flexible metal. The furnace shell sliding sealing sleeve is arranged outside the furnace core. The furnace core includes a feeding end and a discharging end. The feeding end is rotatably connected to the frame and can move horizontally on the frame, and the discharging end is rotatably connected to the frame. The motor is arranged on the frame and drives the furnace core to rotate. There is an interlayer space between the furnace core and the furnace shell. Two parallel guide rails are arranged along the length direction on the inner wall of the furnace shell.

[0009] The wall scraping mechanism includes a hydraulic push rod, a locker and multiple shaping units. The hydraulic push rod is arranged on the frame and abuts against the feed end. The locker is arranged on the feed end.

[0010] The shaping unit includes a rope body, a winding machine and a pulley, the pulley is arranged on one of the guide rails, and the winding machine is arranged on the other guide rail. The rope body starts from the winding machine and passes through the pulley to form a loop around the furnace and then is connected to the winding machine; when wall scraping is required, the winding machine is started to tighten the rope body so that the furnace is deformed into an elliptical shape at the position tightened by the rope body to facilitate the hydraulic push rod to push the feed end to make the furnace elastically deformed. When the elastic deformation reaches the preset position, the locker locks and fixes the discharge end. At the same time, the winding machine rotates in the opposite direction to loosen the rope body. At the same time, after the hydraulic push rod is loosened, the locker releases the discharge end and uses the elastic potential energy accumulated in the furnace to quickly rebound to form vibration to achieve wall scraping.

[0011] Preferably, the shaping unit further comprises a first moving block and a second moving block, the winding machine is connected to a guide rail via the first moving block, and the pulley is connected to another guide rail via the second moving block.

[0012] Preferably, the winding machine is located on an upper track.

[0013] Preferably, each time the winding machine drives the rope to be tightened, the angle at which the motor controls the furnace to stop is different from the angle at which the furnace was stopped and tightened the previous time.

[0014] Preferably, the carbonization rotary kiln further includes an exhaust pump and a one-way valve, and the exhaust pump is connected to the interlayer space through the one-way valve.

[0015] Preferably, the carbonization rotary kiln further includes a circulation pump and a heater, the furnace shell is provided with an air inlet and an air outlet, and the air outlet, the circulation pump, the heater, and the air inlet are connected in sequence.

[0016] Preferably, the carbonization rotary kiln further includes a radiator and a three-way valve, the circulation pump is connected to the radiator and the heater respectively through the three-way valve, and the radiator is also connected to the air inlet.

[0017] Preferably, the furnace core is a cylindrical structure formed of flexible breathable steel.

[0018] Preferably, the surface of the rope body is coated with a lubricating layer.

[0019] Preferably, the lock comprises a base, a spring, a latch and a handle;

[0020] A force-bearing baffle is provided on the feed end;

[0021] The base is located below the force-bearing baffle; a vertical slot and a horizontal slot are provided on the base, and the horizontal slot is connected to the vertical slot; the spring is provided at the bottom of the vertical slot, and the latch is provided in the vertical slot and extends out of the vertical slot to limit the force-bearing baffle; the handle passes through the horizontal slot and is connected to the latch;

[0022] The hydraulic push rod is arranged on the frame and abuts against the force-bearing baffle at the feed end.

[0023] The beneficial effects of the present invention are as follows: by setting up multiple shaping units, the furnace core with a circular cross-section is tightened into an elliptical shape by the rope body through the cooperation of the winding machine, the pulley and the rope body. Due to the change in shape, the mechanical structure of the cylinder changes, and elastic deformation can easily occur under the extrusion of the hydraulic push rod. Loosening the rope body increases the energy of the elastic shape, and the accumulated energy is released instantly by releasing the lock to form a rebound vibration. The vibration generated by the rebound causes the material adhering to the inner wall of the furnace core to fall off under the action of the vibration rebound, that is, "wall scraping" is achieved through vibration; by placing the wall scraping mechanism externally, the space inside the furnace core can be larger, more materials can be accommodated at one time, and no complicated maintenance process is required, thereby improving efficiency; and the rope body and the motor drive the rotation of the furnace core, so that the angle of tightening the furnace core each time the wall is scraped can be adjusted, avoiding mechanical fatigue caused by the fixed position resulting in a fixed deformation angle, thereby ensuring the service life of the furnace core. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural schematic diagram of a carbonization rotary kiln according to a specific embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the partial structure of a carbonizing rotary kiln according to a specific embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the partial structure of a wall scraping mechanism of a carbonizing rotary kiln according to a specific embodiment of the present invention;

[0027] Explanation of the reference numbers: 1. Furnace body; 11. Furnace core; 111. Feed end; 112. Discharge end; 113. Force baffle; 12. Furnace shell; 13. Interlayer space; 2. Scraper mechanism; 21. Hydraulic push rod; 22. Lock; 221. Base; 222. Latch; 223. Handle; 23. Shaping unit; 231. Rope; 232. Winding machine; 233. Pulley; 3. Frame. DETAILED DESCRIPTION

[0028] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0029] Please refer to Figures 1 to 3 , a carbonizing rotary kiln, comprising a furnace body 1, a scraping mechanism 2 and a frame 3;

[0030] The furnace body 1 includes a motor, a furnace 11, and a furnace shell 12. The furnace 11 is a cylindrical structure formed of flexible metal; the furnace shell 12 is provided with a sliding sealing sleeve outside the furnace 11; the furnace 11 includes a feed end 111 and a discharge end 112, the feed end is rotatably connected to the frame and can move horizontally on the frame, and the discharge end 112 is rotatably connected to the frame 3; the motor is provided on the frame 3 and drives the furnace 11 to rotate; an interlayer space 13 is provided between the furnace 11 and the furnace shell 12; two parallel guide rails are provided on the inner wall of the furnace shell 12 along the length direction;

[0031] The scraping mechanism 2 includes a hydraulic push rod 21, a locker 22 and multiple shaping units 23. The hydraulic push rod 21 is arranged on the frame 3 and abuts against the feed end 111; the locker 22 is arranged on the feed end 111;

[0032] The shaping unit 23 includes a rope body 231, a winder 232 and a pulley 233. The pulley 233 is arranged on one of the guide rails, and the winder 232 is arranged on the other guide rail. The rope body 231 starts from the winder 232 and passes through the pulley 233 to form a loop around the furnace 11 and then is connected to the winder 232. When wall scraping is required, the winder 232 is started to tighten the rope body 231 so that the furnace 11 is deformed into an elliptical position by the tightened position of the rope body 231 to facilitate the hydraulic push rod 21 to push the feeding end 111 to make the furnace 11 elastically deformed. When the elastic deformation reaches the preset position, the locker 22 locks and fixes the discharging end 112. At the same time, the winder 232 rotates in the opposite direction to loosen the rope body 231. At the same time, after the hydraulic push rod 21 is loosened, the locker 22 releases the discharging end 112 and utilizes the elastic potential energy accumulated in the furnace 11 to quickly rebound to form vibration to achieve wall scraping.

[0033] As can be seen from the above description, by setting up multiple shaping units 23, the cooperation of the winding machine 232, the pulley 233, and the rope body 231 makes the furnace 11 with a circular cross-section be tightened into an elliptical shape by the rope body 231 under the action of the rope body 231. Due to the change in shape, the mechanical structure of the cylindrical shape changes, and it can easily undergo elastic deformation under the squeezing of the hydraulic push rod 21. Loosening the rope body 231 increases the energy of the elastic shape, and releasing the locker 22 allows the accumulated energy to be released instantly to form a rebound vibration. The vibration generated by the rebound causes the material adhering to the inner wall of the furnace 11 to fall off under the action of the vibration rebound; by externalizing the scraping mechanism 2, the space inside the furnace 11 can be larger, more materials can be accommodated at one time, and no complicated maintenance process is required, thereby improving efficiency; and by the rope body 231 and the motor driving the rotation of the furnace 11, the angle of tightening the furnace 11 each time the wall is scraped can be adjusted, avoiding mechanical fatigue caused by the fixed position causing the deformation angle to be fixed, thereby ensuring the service life of the furnace 11.

[0034] Furthermore, the shaping unit 23 further includes a first moving block and a second moving block, the winding machine 232 is connected to a guide rail via the first moving block, and the pulley 233 is connected to another guide rail via the second moving block.

[0035] From the above description, it can be seen that by setting the first movable block and the second movable block, the position of the winder 232 and the pulley 233 can be adjusted to avoid mechanical fatigue caused by always tightening in the same place and extend the service life.

[0036] Furthermore, the winding machine 232 is located on the upper track.

[0037] As can be seen from the above description, by placing the wire winder 232 on top, it is possible to prevent dust leaking into the interlayer space 13 from causing damage to the wire winder 232 .

[0038] Furthermore, each time the winding machine 232 drives the rope to be tightened, the angle at which the motor controls the furnace 11 to stop is different from the angle at which it was tightened the previous time.

[0039] From the above description, we can know that the angle of tightening is different each time, for example, 0° for the first time, 1° for the second time, 2° for the third time, and so on. After 360 times, it returns to 0°. It can also be 0° for the first time, 220° for the second time, and 156° for the third time. It can also be random, as long as there is no repetition. This can avoid repeated deformation of one place.

[0040] Furthermore, the carbonization rotary kiln further includes an exhaust pump and a one-way valve, and the exhaust pump is connected to the interlayer space 13 through the one-way valve.

[0041] From the above description, it can be seen that by setting the vacuum pump and the one-way valve, vacuuming can be achieved and heat loss during processing can be reduced.

[0042] Furthermore, the carbonization rotary kiln further includes a circulation pump and a heater, and the furnace shell 12 is provided with an air inlet and an air outlet, and the air outlet, the circulation pump, the heater, and the air inlet are connected in sequence.

[0043] It can be seen from the above description that, by providing the circulation pump and the heater, the furnace 11 can be conveniently preheated or rapidly heated.

[0044] Furthermore, the carbonization rotary kiln also includes a radiator and a three-way valve. The circulation pump is connected to the radiator and the heater respectively through the three-way valve. The radiator is also connected to the air inlet.

[0045] From the above description, it can be seen that temperature adjustment can be easily achieved by setting the radiator.

[0046] Furthermore, the furnace 11 is a cylindrical structure formed of flexible breathable steel.

[0047] From the above description, it can be seen that by using breathable steel, hot gas can fill the interlayer space 13 and penetrate into the furnace 11, and the gas can blow off the materials adhering to the inner wall of the furnace 11 or form an air film to make it difficult for the materials to adhere. Combining with the scraping mechanism 2 can enhance the effect of preventing adhesion.

[0048] Furthermore, the surface of the rope body 231 is coated with a lubricating layer.

[0049] It can be seen from the above description that the provision of the lubricating layer can reduce the friction between the furnace 11 and the rope body 231, thereby avoiding breakage due to excessive friction.

[0050] Furthermore, the lock 22 includes a base 221, a spring, a latch 222 and a handle 223;

[0051] The feed end 111 is provided with a force baffle 113;

[0052] The base 221 is located below the load-bearing baffle 113; a vertical slot and a horizontal slot are provided on the base 221, and the horizontal slot is connected to the vertical slot; the spring is provided at the bottom of the vertical slot, and the latch 222 is provided in the vertical slot and extends out of the vertical slot to limit the load-bearing baffle 113; the handle 223 passes through the horizontal slot and is connected to the latch 222;

[0053] The hydraulic push rod 21 is arranged on the frame 3 and abuts against the force baffle 113 of the feed end 111 . Example 1

[0054] A carbonizing rotary kiln comprises a furnace body 1, a wall scraping mechanism 2 and a frame 3;

[0055] The furnace body 1 includes a motor, a furnace 11, and a furnace shell 12. The furnace 11 is a cylindrical structure formed of flexible metal; the furnace shell 12 is provided with a sliding sealing sleeve outside the furnace 11; the furnace 11 includes a feed end 111 and a discharge end 112, the feed end is rotatably connected to the frame and can move horizontally on the frame, and the discharge end 112 is rotatably connected to the frame 3; the motor is provided on the frame 3 and drives the furnace 11 to rotate; an interlayer space 13 is provided between the furnace 11 and the furnace shell 12; two parallel guide rails are provided on the inner wall of the furnace shell 12 along the length direction;

[0056] The scraping mechanism 2 includes a hydraulic push rod 21, a locker 22 and multiple shaping units 23. The hydraulic push rod 21 is arranged on the frame 3 and abuts against the feed end 111; the locker 22 is arranged on the feed end 111;

[0057] The shaping unit 23 includes a rope body 231, a winder 232 and a pulley 233. The pulley 233 is arranged on one of the guide rails, and the winder 232 is arranged on the other guide rail. The rope body 231 starts from the winder 232 and passes through the pulley 233 to form a loop around the furnace 11 and then is connected to the winder 232. When wall scraping is required, the winder 232 is started to tighten the rope body 231 so that the furnace 11 is deformed into an elliptical position by the tightened position of the rope body 231 to facilitate the hydraulic push rod 21 to push the feeding end 111 to make the furnace 11 elastically deformed. When the elastic deformation reaches the preset position, the locker 22 locks and fixes the discharging end 112. At the same time, the winder 232 rotates in the opposite direction to loosen the rope body 231. At the same time, after the hydraulic push rod 21 is loosened, the locker 22 releases the discharging end 112 and utilizes the elastic potential energy accumulated in the furnace 11 to quickly rebound to form vibration to achieve wall scraping.

[0058] The shaping unit 23 further includes a first moving block and a second moving block. The winding machine 232 is connected to a guide rail via the first moving block, and the pulley 233 is connected to another guide rail via the second moving block.

[0059] The winding machine 232 is located on the upper track.

[0060] Each time the winding machine 232 drives the rope to be tightened, the angle at which the motor controls the furnace 11 to stop is different from the angle at which it was stopped and tightened the previous time.

[0061] The carbonization rotary kiln further includes an exhaust pump and a one-way valve, and the exhaust pump is connected to the interlayer space 13 through the one-way valve.

[0062] The surface of the rope body 231 is coated with a lubricating layer.

[0063] The lock 22 includes a base 221, a spring, a latch 222 and a handle 223;

[0064] The feed end 111 is provided with a force baffle 113;

[0065] The base 221 is located below the load-bearing baffle 113; a vertical slot and a horizontal slot are provided on the base 221, and the horizontal slot is connected to the vertical slot; the spring is provided at the bottom of the vertical slot, and the latch 222 is provided in the vertical slot and extends out of the vertical slot to limit the load-bearing baffle 113; the handle 223 passes through the horizontal slot and is connected to the latch 222;

[0066] The hydraulic push rod 21 is arranged on the frame 3 and abuts against the force baffle 113 of the feed end 111 . Example 2

[0067] A carbonizing rotary kiln comprises a furnace body 1, a wall scraping mechanism 2 and a frame 3;

[0068] The furnace body 1 includes a motor, a furnace 11, and a furnace shell 12. The furnace 11 is a cylindrical structure formed of flexible metal; the furnace shell 12 is provided with a sliding sealing sleeve outside the furnace 11; the furnace 11 includes a feed end 111 and a discharge end 112, the feed end is rotatably connected to the frame and can move horizontally on the frame, and the discharge end 112 is rotatably connected to the frame 3; the motor is provided on the frame 3 and drives the furnace 11 to rotate; an interlayer space 13 is provided between the furnace 11 and the furnace shell 12; two parallel guide rails are provided on the inner wall of the furnace shell 12 along the length direction;

[0069] The scraping mechanism 2 includes a hydraulic push rod 21, a locker 22 and multiple shaping units 23. The hydraulic push rod 21 is arranged on the frame 3 and abuts against the feed end 111; the locker 22 is arranged on the feed end 111;

[0070] The shaping unit 23 includes a rope body 231, a winder 232 and a pulley 233. The pulley 233 is arranged on one of the guide rails, and the winder 232 is arranged on the other guide rail. The rope body 231 starts from the winder 232 and passes through the pulley 233 to form a loop around the furnace 11 and then is connected to the winder 232. When wall scraping is required, the winder 232 is started to tighten the rope body 231 so that the furnace 11 is deformed into an elliptical position by the tightened position of the rope body 231 to facilitate the hydraulic push rod 21 to push the feeding end 111 to make the furnace 11 elastically deformed. When the elastic deformation reaches the preset position, the locker 22 locks and fixes the discharging end 112. At the same time, the winder 232 rotates in the opposite direction to loosen the rope body 231. At the same time, after the hydraulic push rod 21 is loosened, the locker 22 releases the discharging end 112 and utilizes the elastic potential energy accumulated in the furnace 11 to quickly rebound to form vibration to achieve wall scraping.

[0071] The shaping unit 23 further includes a first moving block and a second moving block. The winding machine 232 is connected to a guide rail via the first moving block, and the pulley 233 is connected to another guide rail via the second moving block.

[0072] The winding machine 232 is located on the upper track.

[0073] Each time the winding machine 232 drives the rope to be tightened, the angle at which the motor controls the furnace 11 to stop is different from the angle at which it was stopped and tightened the previous time.

[0074] The carbonization rotary kiln further includes a circulation pump and a heater. The furnace shell 12 is provided with an air inlet and an air outlet. The air outlet, the circulation pump, the heater, and the air inlet are sequentially connected.

[0075] The carbonization rotary kiln further comprises a radiator and a three-way valve. The circulation pump is connected to the radiator and the heater respectively through the three-way valve. The radiator is also connected to the air inlet.

[0076] The surface of the rope body 231 is coated with a lubricating layer.

[0077] The lock 22 includes a base 221, a spring, a latch 222 and a handle 223;

[0078] The feed end 111 is provided with a force baffle 113;

[0079] The base 221 is located below the load-bearing baffle 113; a vertical slot and a horizontal slot are provided on the base 221, and the horizontal slot is connected to the vertical slot; the spring is provided at the bottom of the vertical slot, and the latch 222 is provided in the vertical slot and extends out of the vertical slot to limit the load-bearing baffle 113; the handle 223 passes through the horizontal slot and is connected to the latch 222;

[0080] The hydraulic push rod 21 is arranged on the frame 3 and abuts against the force baffle 113 of the feed end 111 . Example 3

[0081] A carbonization rotary furnace, which is similar to the second embodiment and will not be described in detail, wherein the furnace core 11 is a cylindrical structure formed of flexible breathable steel.

[0082] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A carbonization rotary kiln, characterized in that: It includes furnace body, scraper mechanism and frame; The furnace body includes a motor, a furnace core, and a furnace shell. The furnace core is a cylindrical structure formed of flexible metal. The furnace shell sliding sealing sleeve is arranged outside the furnace core. The furnace core includes a feeding end and a discharging end. The feeding end is rotatably connected to the frame and can move horizontally on the frame, and the discharging end is rotatably connected to the frame. The motor is arranged on the frame and drives the furnace core to rotate. There is an interlayer space between the furnace core and the furnace shell. Two parallel guide rails are arranged along the length direction on the inner wall of the furnace shell. The wall scraping mechanism includes a hydraulic push rod, a locker and multiple shaping units. The hydraulic push rod is arranged on the frame and abuts against the feed end. The locker is arranged on the feed end. The shaping unit includes a rope body, a winding machine and a pulley, the pulley is arranged on one of the guide rails, and the winding machine is arranged on the other guide rail. The rope body starts from the winding machine and passes through the pulley to form a loop around the furnace and then is connected to the winding machine; when it is necessary to scrape the wall, the winding machine is started to tighten the rope body so that the furnace is deformed into an elliptical shape at the position tightened by the rope body to facilitate the hydraulic push rod to push the feeding end to cause the furnace to undergo elastic deformation. When the elastic deformation reaches a preset position, the locker locks and fixes the discharging end, and at the same time, the winding machine rotates in the opposite direction to loosen the rope body. At the same time, after the hydraulic push rod is released, the locker releases the discharging end and utilizes the elastic potential energy accumulated in the furnace to quickly rebound to form vibration to achieve wall scraping; The shaping unit further comprises a first moving block and a second moving block, wherein the winding machine is connected to one guide rail via the first moving block, and the pulley is connected to the other guide rail via the second moving block; The lock includes a base, a spring, a latch and a handle; A force-bearing baffle is provided on the feed end; The base is located below the force-bearing baffle; a vertical slot and a horizontal slot are provided on the base, and the horizontal slot is connected to the vertical slot; the spring is provided at the bottom of the vertical slot, and the latch is provided in the vertical slot and extends out of the vertical slot to limit the force-bearing baffle; the handle passes through the horizontal slot and is connected to the latch; The hydraulic push rod is arranged on the frame and abuts against the force-bearing baffle at the feed end.

2. The carbonization rotary kiln according to claim 1, characterized in that: The winding machine is located on the upper track.

3. The carbonization rotary kiln according to claim 1, characterized in that: Each time the winding machine drives the rope to be tightened, the angle at which the motor controls the furnace to stop is different from the angle at which the furnace was tightened the previous time.

4. The carbonization rotary kiln according to claim 1, characterized in that: The carbonization rotary kiln further comprises an air extraction pump and a one-way valve, and the air extraction pump is communicated with the interlayer space through the one-way valve.

5. The carbonization rotary kiln according to claim 1, characterized in that: The carbonization rotary kiln further includes a circulation pump and a heater. The furnace shell is provided with an air inlet and an air outlet. The air outlet, the circulation pump, the heater and the air inlet are connected in sequence.

6. The carbonization rotary kiln according to claim 5, characterized in that: The carbonization rotary kiln further comprises a radiator and a three-way valve. The circulation pump is connected to the radiator and the heater respectively through the three-way valve. The radiator is also connected to the air inlet.

7. The carbonization rotary kiln according to claim 5, characterized in that: The furnace core is a cylindrical structure formed by flexible breathable steel.

8. The carbonization rotary kiln according to claim 1, characterized in that: The surface of the rope body is coated with a lubricating layer.

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