A drum dryer

Abstract

The present invention relates to a drum dryer, belonging to the technical field of dryers, and includes a base frame, one end of which is rotatably connected to an electric cylinder, the other end of which is provided with an articulated seat, and a base frame provided above the base frame, the top of the electric cylinder being rotatably connected to one end of the base frame, and the top of the articulated seat being rotatably connected to the other end of the base frame. The present invention solves the problem of directly utilizing heat generated by fuel combustion for drying operations, which has many disadvantages, such as excessively rapid heat release, difficulty in finely controlling heat generation efficiency, uneven heat distribution, and sometimes abnormally high temperatures or lack of oxygen leading to insufficient heat supply, thus affecting the normal progress of drying operations. The use of electric heating also has the problem of uneven heat release. In the present invention, the flow of the medium oil can be monitored by detecting the rotation speed of the turntable, and the flow of the medium oil can be cut off by locking the turntable. The heating resistor and the second resistor generate heat to heat the medium oil, which transfers heat to the inner wall of the drying chamber, heating the material in the drying chamber, thereby evaporating the moisture therein.

Description

Technical Field

[0001] The invention belongs to the technical field of dryers, and in particular relates to a drum type dryer. Background Art

[0002] There are several modes of dryers, including belt drying, drum drying, box drying and tower drying. The heat sources include coal, electricity and gas. The materials are dried in hot air airflow and radiation drying processes. Hot air drum drying is a process in which the hot air moves from the tail to the front, fully contacts the material, and fully utilizes the heat transfer through heat conduction, convection and radiation to transfer the heat energy directly to the material, so that the moisture of the material is continuously evaporated in the cylinder. The induced draft device at the inlet draws out a large amount of moisture and wet air flow to prevent secondary pollution caused by dust discharge. The internal spiral stirring, sweeping and copying are used to promote the movement of the material to complete the entire drying process. Countercurrent conduction dehumidification avoids reducing repeated drying procedures.

[0003] Directly using the heat generated by fuel combustion for drying operations has many disadvantages, such as the heat is released too quickly, it is difficult to finely control the heat production efficiency, the heat distribution is not uniform enough, and sometimes abnormally high temperature or lack of oxygen will lead to insufficient heat supply and affect the normal progress of the drying work. The use of electric heating also has the problem of uneven heat release. Therefore, a drum dryer is proposed. Summary of the Invention

[0004] The present invention provides a drum dryer, the purpose of which is to solve the problem of directly using the heat generated by fuel combustion for drying operations, which has many disadvantages, such as the heat is released too quickly, it is difficult to finely control the heat production efficiency, the heat distribution is not uniform enough, and sometimes abnormal high temperature or lack of oxygen will lead to insufficient heat supply and affect the normal progress of the drying work. The use of electric heating also has the problem of uneven heat release.

[0005] The present invention provides a drum dryer, comprising a base frame, one end of the base frame being rotatably connected to an electric cylinder, the other end of the base frame being provided with an articulated seat, a base being provided above the base frame, a movable end of the electric cylinder being rotatably connected to one end of the base, and a top of the articulated seat being rotatably connected to the other end of the base;

[0006] A drying cylinder is provided above the base, and a turntable is provided at one end of the drying cylinder. The edge of one side of the turntable is rotatably connected to a plurality of universal wheels, and the universal wheels are in abutment with and variably connected to one side of the top of the base. Two annular grooves 1 and 2 are provided on the outer circumference of the drying cylinder, and the two annular grooves 1 are located on both sides of the annular groove 2. The annular groove 2 is connected to a transmission gear ring, and one annular groove is connected to a limiting ring. The bottom end of the limiting ring is fixedly connected to the top end of the base;

[0007] The base is rotatably connected to a driving gear, a driving motor is provided on the inner side of the base, an output shaft of the driving motor is fixedly connected to the driving gear, the transmission gear ring is engaged with the driving gear, and a circulating heating mechanism is provided on the inner side of the base;

[0008] A drying chamber is provided on the inner side of the drying cylinder, and a plurality of stirring plates are evenly arranged on the inner circumference of the drying chamber.

[0009] Furthermore, a drying chamber is provided on the inner side of the drying cylinder, an exhaust pipe is plugged into one end of the drying chamber, and a sealing cover is plugged into one end of the drying chamber;

[0010] An air vent is provided on the inner side of the exhaust pipe, a plurality of air intake holes are provided on the circumference of the air vent, and an exhaust fan is provided on the inner side of the air vent.

[0011] By adopting the above solution, the exhaust pipe can discharge the gas including water vapor inside the drying chamber, thereby improving the drying efficiency inside the drying chamber.

[0012] Furthermore, the circulation heating mechanism includes a transmission gear ring, a cylindrical groove, a turntable, a second resistor, a circulation pipe and a circulation pump. A cylindrical groove is provided inside the base frame, and a turntable is rotatably connected to the inner side of the cylindrical groove. The turntable is a dumbbell-shaped turntable consisting of two discs and a long cylinder. A plurality of heating resistors are installed on the inner side of the turntable, and the heating resistors are installed around the rotation center line of the turntable. The heating resistors are tangent to the outer circumference of the long cylinder. The two ends of the cylindrical groove are respectively connected to a circulation pipe, and the ends of the two circulation pipes away from the cylindrical groove are respectively connected to a limiting ring. A heat conduction cavity is provided on the inner side of the drying cylinder, and the heat conduction cavity is provided with a circulation channel. A connecting cylinder is installed at the opening of the circulation channel, and the connecting cylinder and the limiting ring are movably plugged.

[0013] A circulation pump is provided on the circulation pipeline, a second resistor is provided on the inner bottom wall of the cylindrical groove, and heat transfer oil is contained in the inner side of the circulation pipeline.

[0014] By adopting the above scheme, the circulation pump controls the medium oil to circulate in the circulation pipe, the circulation channel, the heat conduction cavity and the inner side of the cylindrical groove. The medium oil drives the transmission gear ring heating resistor and the turntable to rotate in the inner cavity of the cylindrical groove. The flow of the medium oil can be monitored by detecting the rotation speed of the turntable. The flow of the medium oil can be cut off by locking the turntable. The heating resistor and the second resistor generate heat to heat the medium oil, which transfers the heat to the inner wall of the drying cavity, so that the material in the drying cavity is heated, thereby evaporating the moisture in the material.

[0015] Furthermore, a sliding groove is provided on the inner side of the limiting ring, and an annular cavity is provided on the side of the sliding groove close to the outer periphery of the limiting ring. The annular cavity corresponds to and is connected to the circulation pipe. A heat transfer layer is provided between the heat conduction cavity and the drying cavity, and the heat transfer layer is made of a material with a thermal conductivity greater than 300.

[0016] By adopting the above solution, the circulation pipeline introduces the medium oil into the annular cavity and sliding groove in one of the limit rings. The medium oil passes through the load-bearing wheel and reaches the heat conduction cavity, releasing heat through the heat transfer layer, thereby heating the inner cavity of the drying cavity. The medium oil in the drying cavity is then discharged into the circulation pipeline through another limit ring.

[0017] Furthermore, a limiting groove is provided on the inner bottom wall of the drying chamber, a bottom plate is inserted into the inner side of the limiting groove, the bottom plate passes through both ends of the drying cylinder, and a stirring plate is provided on the top of the bottom plate.

[0018] By adopting the above solution, the limiting groove and the bottom plate cooperate to allow the stirring plate at the bottom of the drying chamber to be partially removed, thereby not blocking the discharge of materials inside the drying chamber and making it discharge more smoothly.

[0019] Furthermore, a plurality of bearing wheels are rotatably connected to the inner wall of the annular groove 1, and the outer sides of the bearing wheels are in abutment with and movably connected to the inner side of the limiting ring.

[0020] By adopting the above solution, the load-bearing wheel is arranged on the limiting ring between the drying cylinders, so that the relative movement between the two is smoother.

[0021] Furthermore, a sealing groove is provided on the inner side of an inner wall of the annular groove, and a plurality of annular frames are respectively provided on both sides of the limiting ring, and the annular frames extend into the sealing groove.

[0022] By adopting the above solution, the sealing groove can improve the sealing performance between the limit ring and the annular groove 1, so that the medium oil is sealed in the cavity between the annular groove 1 and the sliding groove.

[0023] Furthermore, a feeding trough is provided at the top of one end of the drying cylinder, the feeding trough is arranged at an angle, a sealing column is inserted into the feeding trough, a locking bolt is threadedly connected to one end of the top of the drying cylinder, and an insertion rod is provided at the bottom end of the locking bolt, and the insertion rod extends into the feeding trough and is inserted into the sealing column.

[0024] By adopting the above solution, the material to be dried can be introduced into the inner side of the drying chamber through the feeding chute.

[0025] Furthermore, a slide is movably mounted on one side of the bottom plate, a connecting block is provided on the side of the slide facing the bottom plate, the slide is rotatably connected to the screw rod, a servo motor is provided on the inner side of the slide, the output end of the servo motor is fixedly connected to the screw rod, the connecting block and the bottom plate are movably plugged in, the screw rod and the bottom plate are threadedly connected, a connecting groove is provided at one end of the bottom plate, and the connecting block and the connecting groove are socketed.

[0026] By adopting the above solution, the slide plate is connected and linked to the bottom plate through the screw rod and the connecting block, so that the limiting groove can still be closed after the bottom plate is separated from the limiting groove, but the upper side of the slide plate is smooth and unobstructed.

[0027] Compared with the prior art, the above technical solution of the present invention has the following beneficial technical effects:

[0028] 1. In the present invention, a circulating heating mechanism is utilized, and a circulating pipe introduces medium oil into the annular cavity and the sliding groove in one of the limiting rings. The medium oil passes through the load-bearing wheel and reaches the heat-conducting cavity, where it releases heat through the heat transfer layer, thereby heating the inner cavity of the drying cavity. The medium oil in the drying cavity is then discharged into the circulating pipe through another limiting ring, thereby realizing the circulation of the medium oil. The medium oil releases heat more evenly, which can make the material to be dried in the drying cavity be heated more evenly and controllably, and make the evaporation of moisture in the material more controllable and stable, thus avoiding abnormally high temperature or lack of oxygen that causes insufficient heat supply and affects the normal progress of the drying process.

[0029] 2. In the present invention, the flow of the medium oil can be monitored by detecting the rotation speed of the turntable, and the flow of the medium oil can be cut off by locking the turntable. The heating resistor and the second resistor generate heat to heat the medium oil, which transfers the heat to the inner wall of the drying chamber, heating the material in the drying chamber, thereby evaporating the moisture in the material.

[0030] 3. In the present invention, the use of electric cylinders and slide plates allows the dried materials to be discharged smoothly and quickly. The slide plates replace the bottom plates and appear at the bottom of the drying chamber. The upper side of the slide plates is smooth and flat, and no stirring plate is provided, which will not block the movement of the materials inside the drying chamber on the top of the slide plates, allowing them to be discharged more smoothly from the inside of the drying chamber.

[0031] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the cross-sectional structure of the front side of the drying drum of the present invention;

[0035] Figure 3 This is a schematic diagram of the cross-sectional structure of the side of the drying drum of the present invention;

[0036] Figure 4 Schematic diagram of the cross-sectional structure of the limiting ring of the present invention;

[0037] Figure 5 Schematic diagram of the three-dimensional structure of the bottom plate of the present invention;

[0038] Figure 6 Schematic diagram of the three-dimensional structure of the turntable of the present invention;

[0039] Figure 7 For the present invention Figure 2 Schematic diagram of the locally enlarged structure of part A.

[0040] Figure numerals: chassis 1, electric cylinder 2, base 3, drying drum 4, slide plate 5, turntable 6, universal wheel 7, annular groove 1 8, limiting ring 9, annular groove 2 10, transmission gear ring 11, cylindrical groove 12, turntable 13, heating resistor 14, second resistor 15, circulation pipe 16, driving gear 17, driving motor 18, circulation pump 19, feeding trough 20, sealing column 21, locking bolt 22. Insert rod - 23, sealing groove - 24, load-bearing wheel - 25, stirring plate - 26, drying chamber - 27, sealing cover - 28, limiting groove - 29, bottom plate - 30, circulation channel - 31, connecting tube - 32, heat transfer layer - 33, heat conduction chamber - 34, sliding groove - 35, annular chamber - 36, annular frame - 37, servo motor - 38, screw - 39, connecting block - 40, connecting groove - 41, hinge seat - 42, exhaust pipe - 43. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1-7 As shown, the present invention provides a drum dryer, comprising a base frame 1, one end of which is rotatably connected to an electric cylinder 2, the other end of which is provided with an articulated seat 42, a base 3 is provided above the base frame 1, the movable end of the electric cylinder 2 is rotatably connected to one end of the base 3, and the top of the articulated seat 42 is rotatably connected to the other end of the base 3;

[0043] A drying cylinder 4 is provided above the base 3, and a turntable 6 is provided at one end of the drying cylinder 4. The edge of one side of the turntable 6 is rotatably connected to a plurality of universal wheels 7, and the universal wheels 7 are in contact with and variably connected to one side of the top of the base 3. The outer periphery of the drying cylinder 4 is provided with two annular grooves 1 8 and annular groove 2 10. The two annular grooves 1 8 are located on both sides of the annular groove 2 10. The annular groove 2 10 is sleeved with a transmission gear ring 11, and the annular groove 1 8 is sleeved with a limit ring 9. The bottom end of the limit ring 9 is fixedly connected to the top of the base 3;

[0044] The base 3 is rotatably connected to a driving gear 17, and a driving motor 18 is provided on the inner side of the base 3. The output shaft of the driving motor 18 is fixedly connected to the driving gear 17, and the transmission gear ring 11 is engaged with the driving gear 17. A circulating heating mechanism is provided on the inner side of the base 3;

[0045] A drying chamber 27 is formed inside the drying cylinder 4 , and a plurality of stirring plates 26 are evenly arranged on the inner circumference of the drying chamber 27 .

[0046] Furthermore, a drying chamber 27 is provided on the inner side of the drying cylinder 4, an exhaust pipe 43 is connected to one end of the drying chamber 27, and a sealing cover 28 is connected to one end of the drying chamber 27;

[0047] An air vent is provided on the inner side of the exhaust pipe 43 , a plurality of air intake holes are provided on the circumference of the air vent, and an exhaust fan is provided on the inner side of the air vent.

[0048] By adopting the above solution, the exhaust pipe 43 can discharge the gas including water vapor inside the drying chamber 27, thereby improving the drying efficiency inside the drying chamber 27.

[0049] Furthermore, the circulating heating mechanism includes a transmission gear ring 11, a cylindrical groove 12, a turntable 13, a second resistor 15, a circulation pipe 16 and a circulation pump 19. A cylindrical groove 12 is provided inside the base frame 1, and the turntable 13 is rotatably connected to the inner side of the cylindrical groove 12. The turntable 13 is a dumbbell-shaped turntable consisting of two discs and a long cylinder. A plurality of heating resistors 14 are arranged on the inner side of the turntable 13. The heating resistors 14 are arranged around the rotation center line of the turntable 13, and the heating resistors 14 are tangent to the outer circumference of the long cylinder. The two ends of the cylindrical groove 12 are respectively connected to a circulation pipe 16, and the ends of the two circulation pipes 16 away from the cylindrical groove 12 are respectively connected to a limiting ring 9. A heat conduction cavity 34 is provided on the inner side of the drying cylinder 4, and the heat conduction cavity 34 is provided with a circulation channel 31. A connecting cylinder 32 is arranged at the opening of the circulation channel 31, and the connecting cylinder 32 is movably plugged into the limiting ring 9.

[0050] A circulation pump 19 is provided on the circulation pipe 16 , a second resistor 15 is provided on the inner bottom wall of the cylindrical tank 12 , and heat transfer oil is contained inside the circulation pipe 16 .

[0051] By adopting the above scheme, the circulation pump 19 controls the medium oil to circulate in the circulation pipe 16, the circulation channel 31, the heat conduction cavity 34 and the inner side of the cylindrical groove 12. The medium oil drives the transmission gear ring 11, the heating resistor 14 and the turntable 13 to rotate in the inner cavity of the cylindrical groove 12. The rotation speed of the turntable 13 can be detected to monitor the flow of the medium oil. The flow of the medium oil can be cut off by locking the turntable 13. The heating resistor 14 and the second resistor 15 generate heat to heat the medium oil, so that the medium oil transfers heat to the inner wall of the drying chamber 27, so that the material in the drying chamber 27 is heated, thereby evaporating the moisture in the material.

[0052] Furthermore, a sliding groove 35 is provided on the inner side of the limiting ring 9, and an annular cavity 36 is provided on the side of the sliding groove 35 close to the outer periphery of the limiting ring 9. The annular cavity 36 corresponds to and is connected to the circulation pipe 16. A heat transfer layer 33 is provided between the heat conduction cavity 34 and the drying cavity 27, and the heat transfer layer 33 is made of a material with a thermal conductivity greater than 300.

[0053] By adopting the above solution, the circulation pipe 16 guides the medium oil into the annular cavity 36 and the sliding groove 35 in one of the limit rings 9. The medium oil passes through the load-bearing wheel 25 and reaches the heat conduction cavity 34, releasing heat through the heat transfer layer 33, thereby heating the inner cavity of the drying cavity 27. The medium oil in the drying cavity 27 is then discharged into the circulation pipe 16 through the other limit ring 9.

[0054] Furthermore, a limiting groove 29 is provided on the inner bottom wall of the drying chamber 27 , a bottom plate 30 is inserted into the inner side of the limiting groove 29 , the bottom plate 30 passes through both ends of the drying cylinder 4 , and a stirring plate 26 is provided on the top of the bottom plate 30 .

[0055] By adopting the above solution, the limiting groove 29 and the bottom plate 30 cooperate to allow the stirring plate 26 at the bottom of the drying chamber 27 to be partially removed, thereby not blocking the discharge of materials inside the drying chamber 27 and making it discharge more smoothly.

[0056] Furthermore, a plurality of load-bearing wheels 25 are rotatably connected to the inner wall of the annular groove 8 , and the outer sides of the load-bearing wheels 25 are in contact with and movably connected to the inner side of the limiting ring 9 .

[0057] By adopting the above solution, the load-bearing wheel 25 is installed between the limiting ring 9 of the drying cylinder 4, so that the relative movement between the two is smoother.

[0058] Furthermore, a sealing groove 24 is provided on the inner side of the inner wall of the annular groove 8 , and a plurality of annular frames 37 are provided on both sides of the limiting ring 9 , and the annular frames 37 extend into the sealing groove 24 .

[0059] By adopting the above solution, the sealing groove 24 can improve the sealing between the limit ring 9 and the annular groove 8, so that the medium oil is sealed in the cavity between the annular groove 8 and the sliding groove 35.

[0060] Furthermore, a feeding trough 20 is provided at the top of one end of the drying cylinder 4, the feeding trough 20 is arranged at an angle, a sealing column 21 is inserted into the feeding trough 20, and a locking bolt 22 is threadedly connected to one end of the top of the drying cylinder 4. The bottom end of the locking bolt 22 is provided with an insertion rod 23, and the insertion rod 23 extends into the feeding trough 20 and is inserted into the sealing column 21.

[0061] By adopting the above solution, the material to be dried can be introduced into the inner side of the drying chamber 27 through the feeding chute 20 .

[0062] Furthermore, a slide plate 5 is movably mounted on one side of the bottom plate 30, and a connecting block 40 is provided on the side of the slide plate 5 facing the bottom plate 30. The slide plate 5 is rotatably connected to the screw rod 39, and a servo motor 38 is provided on the inner side of the slide plate 5. The output end of the servo motor 38 is fixedly connected to the screw rod 39, and the connecting block 40 and the bottom plate 30 are movably plugged in. The screw rod 39 and the bottom plate 30 are threadedly connected. A connecting groove 41 is provided at one end of the bottom plate 30, and the connecting block 40 and the connecting groove 41 are sleeved.

[0063] By adopting the above solution, the slide plate 5 is connected and linked to the bottom plate 30 through the screw rod 39 and the connecting block 40, so that the limiting groove 29 can still be closed after the bottom plate 30 is separated from the limiting groove 29, but the upper side of the slide plate 5 is smooth and unobstructed.

[0064] The specific implementation method is as follows: the electric cylinder 2 controls the base 3 and the drying drum 4 to be in a horizontal state, the material to be dried can be introduced into the inner side of the drying chamber 27 through the feeding chute 20, and then the feeding chute 20 is closed by the sealing column 21 and the locking bolt 22;

[0065] The sealing cover 28 can close the other end of the drying chamber 27. The driving motor 18 rotates the drying drum 4 through the driving gear 17 and the transmission gear ring 11. The drying drum 4 drives the stirring plate 26 in the drying chamber 27 to continuously turn the material in the drying chamber 27. Then the circulation pump 19 is started to circulate the medium oil in the circulation pipe 16, the circulation channel 31, the heat conduction chamber 34 and the inner side of the cylindrical groove 12. The heating resistor 14 and the second resistor 15 work to generate heat, so that the medium oil is heated, and the medium oil transfers heat to the inner wall of the drying chamber 27, so that the material in the drying chamber 27 is heated, thereby evaporating the moisture in the material, and then the material is dried.

[0066] In order to discharge the dried material smoothly and quickly, one end of the drying cylinder 4 can be lifted by the electric cylinder 2 to tilt the inner cavity of the drying chamber 27. The material can be discharged more easily from the opening of the drying chamber 27 under the action of gravity. The slide plate 5 is connected to the bottom plate 30, and then the slide plate 5 replaces the bottom plate 30 and appears at the bottom of the drying chamber 27. The upper side of the slide plate 5 is smooth and flat, and no stirring plate 26 is set. It will not block the movement of the material inside the drying chamber 27 on the top of the slide plate 5, so that it can be discharged more smoothly from the inner side of the drying chamber 27.

[0067] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A drum drying machine, comprising a bottom frame (1), characterized in that: One end of the base frame (1) is rotatably connected to the electric cylinder (2), the other end of the base frame (1) is provided with an articulated seat (42), a base (3) is provided above the base frame (1), the movable end of the electric cylinder (2) is rotatably connected to one end of the base (3), and the top of the articulated seat (42) is rotatably connected to the other end of the base (3); A drying cylinder (4) is provided above the base (3), a turntable (6) is provided at one end of the drying cylinder (4), a plurality of universal wheels (7) are rotatably connected to the edge of one side of the turntable (6), the universal wheels (7) are in contact with one side of the top of the base (3) and are variably connected, two annular grooves (8) and one annular groove (10) are provided on the outer periphery of the drying cylinder (4), the two annular grooves (8) are located on both sides of the annular groove (10), the annular groove (10) is sleeved with a transmission gear ring (11), the annular groove (8) is sleeved with a limit ring (9), and the bottom end of the limit ring (9) is fixedly connected to the top end of the base (3); A drying chamber (27) is provided on the inner side of the drying cylinder (4), and a plurality of stirring plates (26) are evenly arranged on the inner circumference of the drying chamber (27); The base (3) is rotatably connected to a driving gear (17), a driving motor (18) is provided on the inner side of the base (3), an output shaft of the driving motor (18) is fixedly connected to the driving gear (17), the transmission gear ring (11) and the driving gear (17) are engaged, a circulating heating mechanism is provided on the inner side of the base (3), the circulating heating mechanism includes a circulating pipe (16) connected to the limiting ring (9), a heat conduction cavity (34) is provided on the inner side of the drying cylinder (4), and the heat conduction cavity (3 4) A circulation channel (31) is provided, a connecting tube (32) is installed at the opening of the circulation channel (31), the connecting tube (32) is movably connected to the limiting ring (9), a sliding groove (35) is provided on the inner side of the limiting ring (9), and an annular cavity (36) is provided on the side of the sliding groove (35) close to the outer periphery of the limiting ring (9), the annular cavity (36) corresponds to and is connected to the circulation pipe (16), and a heat transfer layer (33) is provided between the heat conduction cavity (34) and the drying cavity (27).

2. A drum dryer according to claim 1, characterized in that: An exhaust pipe (43) is plugged into one end of the drying chamber (27).

3. The drum dryer according to claim 2, characterized in that: A ventilation channel is provided on the inner side of the exhaust cylinder (43), a plurality of air intake holes are provided on the circumference of the ventilation channel, and an exhaust fan is provided on the inner side of the ventilation channel.

4. The drum dryer according to claim 1, characterized in that: The circulating heating mechanism further comprises a cylindrical groove (12), a turntable (13), a heating resistor (14), a second resistor (15) and a circulating pump (19). The cylindrical groove (12) is provided inside the base frame (1). The inner side of the cylindrical groove (12) is rotatably connected to the turntable (13). The turntable (13) is dumbbell-shaped and consists of two disks and a long cylinder. A plurality of heating resistors (14) are arranged on the inner side of the turntable (13). The heating resistors (14) are arranged around the rotation center line of the turntable (13). The heating resistors (14) and the outer circumference of the long cylinder are tangent. The two ends of the cylindrical groove (12) are respectively connected to one of the circulating pipes (16), and the ends of the two circulating pipes (16) away from the cylindrical groove (12) are respectively connected to one of the limiting rings (9). The circulation pump (19) is provided on the circulation pipe (16), and the second resistor (15) is provided on the inner bottom wall of the cylindrical groove (12).

5. The drum dryer according to claim 4, characterized in that: A limiting groove (29) is provided on the inner bottom wall of the drying chamber (27), a bottom plate (30) is inserted into the inner side of the limiting groove (29), the bottom plate (30) passes through both ends of the drying cylinder (4), and a stirring plate (26) is provided on the top of the bottom plate (30).

6. The drum dryer according to claim 4, characterized in that: The inner wall of the annular groove (8) is rotatably connected to a plurality of bearing wheels (25), and the outer side of the bearing wheels (25) is in contact with the inner side of the limiting ring (9) and is movably connected.

7. The drum dryer according to claim 1, characterized in that: A sealing groove (24) is provided on the inner side of the inner wall of the annular groove (8), and a plurality of annular frames (37) are provided on both sides of the limiting ring (9), and the annular frames (37) extend into the sealing groove (24).

8. The drum dryer according to claim 1, characterized in that: A feeding trough (20) is provided at the top of one end of the drying cylinder (4), the feeding trough (20) is tilted, a sealing column (21) is plugged into the feeding trough (20), and a locking bolt (22) is threadedly connected to one end of the top of the drying cylinder (4), the bottom end of the locking bolt (22) extends into the feeding trough (20) and is plugged into the sealing column (21).

9. The drum dryer according to claim 5, characterized in that: A slide plate (5) is movably mounted on one side of the bottom plate (30), a connecting block (40) is provided on the side of the slide plate (5) facing the bottom plate (30), the slide plate (5) is rotatably connected to the screw rod (39), a servo motor (38) is provided on the inner side of the slide plate (5), an output end of the servo motor (38) is fixedly connected to the screw rod (39), the connecting block (40) and the bottom plate (30) are movably plugged in, and the screw rod (39) and the bottom plate (30) are threadedly connected.

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