A screw conveyor

Abstract

The present invention belongs to the technical field of screw conveyors, and discloses a screw conveyor comprising a bracket and a conveying cylinder, wherein a pressure cover and a gear box are installed at one end of the conveying cylinder, a motor is installed at one end of the gear box, a main shaft is rotatably installed on the inner wall of the conveying cylinder and the gear box, a spiral blade 1 is welded to the outer surface of the main shaft, the main shaft is driven by a motor, a feed port and a discharge port are respectively installed on the surface of the conveying cylinder, a replacement cylinder is rotatably installed on the middle part of the inner wall of the conveying cylinder, and a buffer sleeve is movably sleeved on the outer surface of the replacement cylinder. In this device, when the spiral blade 1 is rotating to transport materials, the speed difference generated between it and the replacement cylinder can reduce the relative speed between the spiral blade 1 and the replacement cylinder without affecting the material feeding of the spiral blade 1, thereby significantly reducing the degree of wear between the replacement cylinder and the spiral blade 1, which helps to extend the life of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of screw conveyors, in particular to a screw conveyor. Background Art

[0002] A screw conveyor is a device that uses an electric motor as power to drive the screw to rotate and generate axial thrust to continuously convey some powdered materials. The spiral blades are fixed on the shaft, and the shaft is driven by the motor. The rotation of the spiral blades will drive the material to move in the transportation direction and discharge the material at the discharge port. In the existing technology, the spiral blades of the shaft screw conveyor rotate and abut against the feeding inside of the device, thereby continuously conveying the material along the feeding channel. When the spiral rotates, the gravity of the material and the friction between the inner wall of the device and the material resist the tendency of the spiral blades to drive the material upward. Due to the continuous sliding abutment between the spiral blades and the inner wall of the device, on the one hand, the inner wall of the device is worn. At the same time, the metal material will produce small-volume metal particles after mutual friction. Although the amount is small, the continuous friction will gradually increase the mixing amount of metal particles in the material, and the continuous wear is not conducive to the continuous and stable operation of the device. In the long run, the two sets of components that rub against each other will be damaged to varying degrees. Summary of the Invention

[0003] The object of the present invention is to provide a screw conveyor to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a screw conveyor, comprising a bracket and a transport cylinder, one end of the transport cylinder is equipped with a gland and a gear box, one end of the gear box is equipped with a motor, the inner wall of the transport cylinder and the gear box is rotatably equipped with a main shaft, the outer surface of the main shaft is welded with a spiral piece 1, the main shaft is driven by a motor, the surface of the transport cylinder is respectively equipped with a feed port and a discharge port, a replacement cylinder is rotatably installed in the middle of the inner wall of the transport cylinder, the outer surface of the replacement cylinder is movably sleeved with a buffer sleeve, and the left side of the replacement cylinder is fixedly connected with a transition ring, The gear box is fixedly connected to the left side of the pressure cover, and a planetary reduction transmission gear set is installed in the inner cavity of the gear box. The input end of the planetary reduction transmission gear set is fixedly connected to the main shaft, and the output end of the planetary reduction transmission gear set is fixedly connected to a connecting plate. The right side of the connecting plate is fixedly connected to a connecting column, and the right end of the connecting column is fixedly connected to the transition ring. The outer surface of the connecting column is fixedly connected to a spiral piece 2, and the diameter of the spiral piece 2 is smaller than the inner diameter of the transport cylinder. The direction of the spiral piece 1 is consistent with that of the replacement cylinder, and the rotation speed of the spiral piece 1 is greater than the rotation speed of the replacement cylinder.

[0005] As a preferred solution of the present invention, the buffer sleeve is made of a rubber block, and a group of annular isolation chambers are formed between the buffer sleeve and the inner wall of the transport cylinder. The interior of the annular isolation chamber is filled with kerosene, and the outer surface of the spiral piece 1 is in rotational abutment with the interior of the replacement cylinder.

[0006] As a preferred solution of the present invention, the planetary reduction transmission gear set includes a sun gear, an outer ring gear, a planetary carrier and planetary gears. The outer ring gear is fixedly connected to the left side of the pressure cover, and the sun gear is fixedly installed on the outer surface of the main shaft. The right end of the planetary carrier is fixedly connected to the connecting plate and is rotatably installed on the inner wall of the pressure cover. Multiple sets of planetary gears are rotatably installed on the left side of the planetary carrier, and the outer surfaces of the planetary gears are simultaneously meshed with the outer ring gear and the sun gear.

[0007] As a preferred solution of the present invention, the left side of the transport cylinder is threaded with multiple sets of bolts, and is press-fitted with the pressure cover through the bolts. The feed port is installed on the leftmost side of the top of the transport cylinder, and the discharge port is installed on the rightmost side of the bottom of the transport cylinder.

[0008] As a preferred solution of the present invention, the axial cross-section of the transition ring is a right triangle, the inclined surface of the transition ring can provide a transition effect between the left side of the inner wall of the transport cylinder and the inner ring surface of the transition ring, and the transition ring is located on the right side of the feed port.

[0009] As a preferred solution of the present invention, there are two connecting columns, which are centrally symmetrically distributed with respect to the rotation axis of the second spiral piece, and the connecting columns penetrate the surface of the second spiral piece.

[0010] As a preferred solution of the present invention, a set of insulation sleeves is sheathed on the middle part of the outer surface of the transport cylinder, and the insulation sleeves are made of extruded polystyrene foam plastics or molded polystyrene foam plastics or chemical foamed cement board.

[0011] As a preferred solution of the present invention, the number of the planetary gears is at least three, and they are circumferentially and equidistantly distributed between the sun gear and the outer ring gear.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. This device has been redesigned, and a replacement cylinder has been added between the spiral piece 1 and the conveying cylinder, so that the replacement cylinder can replace the conveying cylinder and directly contact the spiral piece 1, which can effectively reduce the degree of wear between the conveying cylinder and the spiral piece 1. The replacement cylinder and the buffer sleeve are rotatably installed in the middle of the inner wall of the conveying cylinder. The replacement cylinder is connected to the planetary reduction transmission gear set in the gear box through a transition ring, a connecting column, and a connecting plate. The planetary reduction transmission gear set can transmit the power from the motor to the connecting plate, i.e., the replacement cylinder, with the same direction and lower speed. When the spiral piece 1 is rotating to transport materials, the speed difference between it and the replacement cylinder can reduce the relative speed between the spiral piece 1 and the replacement cylinder without affecting the material feeding of the spiral piece 1, thereby significantly reducing the degree of wear between the replacement cylinder and the spiral piece 1, which helps to extend the life of the device.

[0014] 2. This device also fills a group of annular isolation chambers formed between the buffer sleeve and the inner wall of the transport cylinder with kerosene, so that the kerosene absorbs the heat generated by the relative friction between the replacement cylinder, the transition ring and the transport cylinder, and automatically produces a thermal expansion effect, thereby automatically squeezing the buffer sleeve to deform it. While preventing kerosene leakage, it also provides a certain support and offsetting effect for the replacement cylinder as a whole, reducing the contact pressure between the replacement cylinder and the inner wall of the transport cylinder, and reducing the frictional resistance between the replacement cylinder and the transport cylinder during relative rotation. When part of the rotational power from the spiral piece is used to drive the replacement cylinder to rotate, power waste is minimized.

[0015] 3. This device is designed with a detachable gland, gearbox and motor on the left side of the transport cylinder, so that the replacement cylinder or spiral blade can be easily replaced after the service life expires. The replacement cylinder can be hydraulically supported by kerosene, which is low-cost, efficient and fast during removal and installation. In particular, when the replacement cylinder is replaced and reinstalled, since kerosene is cheap and easy to obtain, it is only necessary to protrude the left end of the replacement cylinder and place it directly below the feed port to refill the kerosene. In addition, kerosene can produce a thermal expansion effect when heated, so that the kerosene does not need to be pressurized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an internal three-dimensional cutaway of a local structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the front appearance of the overall structure of the present invention;

[0018] Figure 3 It is a front cutaway schematic diagram of the overall structure of the present invention;

[0019] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at A in the middle;

[0020] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0021] Figure 6 It is a top cross-sectional schematic diagram of the overall structure of the present invention;

[0022] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at C in the middle;

[0023] Figure 8 This is a schematic diagram of the structure of the planetary reduction transmission gear set of the present invention;

[0024] Figure 9 This is a schematic diagram of the separation of the planetary reduction transmission gear set, connecting plate, connecting column and spiral plate 2 of the present invention.

[0025] In the figure: 1. Bracket; 2. Transport cylinder; 3. Feed port; 4. Insulation sleeve; 5. Discharge port; 6. Bolts; 7. Pressure cover; 8. Gear box; 9. Motor; 10. Main shaft; 11. Spiral piece 1; 12. Replacement cylinder; 13. Buffer sleeve; 14. Kerosene; 15. Transition ring; 16. Connecting plate; 17. Connecting column; 18. Spiral piece 2; 19. Sun gear; 20. Outer ring gear; 21. Planet carrier; 22. Planetary gear; 23. Planetary reduction transmission gear set. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figures 1 to 9As shown, the embodiment of the present invention provides a screw conveyor, including a bracket 1 and a transport cylinder 2, one end of the transport cylinder 2 is equipped with a pressure cover 7 and a gear box 8, one end of the gear box 8 is equipped with a motor 9, the inner wall of the transport cylinder 2 and the gear box 8 is rotatably equipped with a main shaft 10, the outer surface of the main shaft 10 is welded with a spiral piece 11, the main shaft 10 is driven by the motor 9, the surface of the transport cylinder 2 is respectively equipped with a feed port 3 and a discharge port 5, a replacement cylinder 12 is rotatably installed in the middle of the inner wall of the transport cylinder 2, the outer surface of the replacement cylinder 12 is movably sleeved with a buffer sleeve 13, the left side of the replacement cylinder 12 is fixedly connected with a transition ring 15, and the gear box 8 is fixed. It is fixedly connected to the left side of the gland 7, and a planetary reduction transmission gear set 23 is installed in the inner cavity of the gear box 8. The input end of the planetary reduction transmission gear set 23 is fixedly connected to the main shaft 10, and the output end of the planetary reduction transmission gear set 23 is fixedly connected to a connecting plate 16. The right side of the connecting plate 16 is fixedly connected to a connecting column 17. The right end of the connecting column 17 is fixedly connected to the transition ring 15. The outer surface of the connecting column 17 is fixedly connected to a spiral piece 2 18. The diameter of the spiral piece 2 18 is smaller than the inner diameter of the transport cylinder 2. The spiral piece 11 and the replacement cylinder 12 have the same direction of rotation, and the rotation speed of the spiral piece 11 is greater than the rotation speed of the replacement cylinder 12.

[0028] This device has been redesigned, and a replacement cylinder 12 is added between the spiral piece 11 and the conveying cylinder 2, so that the replacement cylinder 12 can replace the conveying cylinder 2 and directly contact the spiral piece 11, which can effectively reduce the wear between the conveying cylinder 2 and the spiral piece 11. The replacement cylinder 12 is installed in the middle of the inner wall of the conveying cylinder 2 in cooperation with the buffer sleeve 13. The replacement cylinder 12 is connected to the planetary reduction transmission gear set 23 located in the gear box 8 through the transition ring 15, the connecting column 17, and the connecting plate 16. The planetary reduction transmission gear set 23 can transmit the power from the motor 9 to the connecting plate 16, that is, the replacement cylinder 12, with the same direction and lower speed. When the spiral piece 11 is rotating to transport materials, the speed difference between it and the replacement cylinder 12 can reduce the relative speed between the spiral piece 11 and the replacement cylinder 12 without affecting the feeding of the spiral piece 11, thereby significantly reducing the wear between the replacement cylinder 12 and the spiral piece 11, which helps to extend the life of the device.

[0029] The buffer sleeve 13 is made of a rubber block. A set of annular isolation chambers is formed between the buffer sleeve 13 and the inner wall of the transport cylinder 2. The interior of the annular isolation chamber is filled with kerosene 14. The outer surface of the spiral piece 11 is in rotational contact with the interior of the replacement cylinder 12.

[0030] The device also fills a group of annular isolation chambers formed between the buffer sleeve 13 and the inner wall of the transport cylinder 2 with kerosene 14, so that the kerosene 14 absorbs the heat generated by the relative friction between the replacement cylinder 12, the transition ring 15 and the transport cylinder 2, and automatically produces a thermal expansion effect, thereby automatically squeezing the buffer sleeve 13 to deform it. While preventing the kerosene 14 from leaking, it also provides a certain support and offsetting effect for the replacement cylinder 12 as a whole, reducing the contact pressure between the replacement cylinder 12 and the inner wall of the transport cylinder 2, and reducing the friction resistance between the replacement cylinder 12 and the transport cylinder 2 during relative rotation, so that part of the rotational power from the spiral piece 11 can minimize power waste when driving the replacement cylinder 12 to rotate.

[0031] Among them, the planetary reduction transmission gear set 23 includes a sun gear 19, an outer ring gear 20, a planet carrier 21 and planet gears 22. The outer ring gear 20 is fixedly connected to the left side of the gland 7, and the sun gear 19 is fixedly mounted on the outer surface of the main shaft 10. The right end of the planet carrier 21 is fixedly connected to the connecting plate 16 and is rotatably mounted on the inner wall of the gland 7. Multiple sets of planet gears 22 are rotatably mounted on the left side of the planet carrier 21. The outer surfaces of the planet gears 22 are meshed with the outer ring gear 20 and the sun gear 19 at the same time.

[0032] The planetary reduction transmission gear set 23 is responsible for connecting the spiral piece 11 and the replacement cylinder 12, so that the spiral piece 11 and the replacement cylinder 12 can rotate in the same direction at a fast speed and a slow speed. When the sun gear 19 is the input end and the outer ring gear 20 is fixed, the planetary gear 22 will be driven to revolve and rotate at the same time. At this time, the planetary carrier 21 will also be driven to achieve the same-direction reduction function at a smaller speed.

[0033] Among them, the left side of the transport cylinder 2 is threaded with multiple sets of bolts 6, and is press-fitted with the gland 7 through the bolts 6. The feed port 3 is installed on the leftmost side of the top of the transport cylinder 2, and the discharge port 5 is installed on the rightmost side of the bottom of the transport cylinder 2;

[0034] The bolts 6 are used to press the connection between the gland 7 and the transport cylinder 2 , and the locking force generated by the bolts 6 provides the connection between the gland 7 and the transport cylinder 2 .

[0035] The present device is designed with a detachable pressure cover 7, gear box 8 and motor 9 on the left side of the transport cylinder 2, so that the replacement cylinder 12 or the spiral piece 11 can be easily replaced after the service life expires. The replacement cylinder 12 can be hydraulically supported by kerosene 14, which is low-cost, efficient and fast during disassembly and installation. In particular, when the replacement cylinder 12 is replaced and reinstalled, since kerosene 14 is cheap and easy to obtain, the kerosene 14 can be replenished by simply protruding the left end of the replacement cylinder 12 and arranging it directly below the feed port 3. In addition, the kerosene 14 can produce a thermal expansion effect when heated, so that the kerosene 14 does not need to be pressurized.

[0036] The axial cross-section of the transition ring 15 is a right triangle, and the inclined surface of the transition ring 15 can provide a transition between the left side of the inner wall of the transport cylinder 2 and the inner surface of the transition ring 15. The transition ring 15 is located on the right side of the feed port 3.

[0037] The inclined surface of the transition ring 15 enables the material located around the spiral plate 2 18 to be pushed rightward by the spiral plate 2 18 and pass through the inclined surface of the transition ring 15 to the right into the inner annular surface of the replacement cylinder 12, thereby avoiding material accumulation.

[0038] There are two connecting posts 17 , which are centrally symmetrically distributed with respect to the rotation axis of the second spiral piece 18 , and the connecting posts 17 penetrate the surface of the second spiral piece 18 ;

[0039] The connecting column 17 is used to connect the connecting plate 16 and the replacement cylinder 12 and transmit power to the replacement cylinder 12. The connecting column 17 is also used to separately connect the spiral plate 2 18 so that the spiral plate 2 18 can transport the material located directly below the feed port 3 to the right.

[0040] Among them, the middle part of the outer surface of the transport cylinder 2 is covered with a set of insulation sleeves 4, and the insulation sleeves 4 are made of extruded polystyrene foam plastics or molded polystyrene foam plastics or chemical foamed cement board;

[0041] The heat preservation sleeve 4 is made of heat-insulating material. The heat generated by the friction between the transport cylinder 2 and the replacement cylinder 12 and the transition ring 15 is quickly lost under the heat preservation measures of the heat preservation sleeve 4, which can facilitate the kerosene 14 to quickly absorb the heat.

[0042] The number of planetary gears 22 is at least three and they are equidistantly distributed between the sun gear 19 and the outer ring gear 20.

[0043] The number of planetary gears 22 determines the transmission ratio between the spiral piece 11 and the replacement cylinder 12. The more teeth the multiple sets of planetary gears 22 have, the lower the speed output by the planetary carrier 21. In this way, the speed of the replacement cylinder 12 can be changed by changing the number of planetary gears 22, thereby enhancing the adaptability of the device.

[0044] Working principle:

[0045] First, determine the material transportation direction of the device, that is, from left to right, start the motor 9, and drive the main shaft 10 and spiral piece 11 to rotate continuously. At this time, the planetary reduction transmission gear set 23 is driven, and drives the connecting plate 16, connecting column 17, spiral piece 2 18, transition ring 15 and replacement cylinder 12 to rotate. In the inner cavity of the gear box 8, the outer ring gear 20 is fixed, and the sun gear 19 is driven and rotated by the main shaft 10, inputting power into the planetary reduction transmission gear set 23. The sun gear 19 drives the planetary gears 22 to rotate, so that the planetary gears 22, under the fixed limit action of the outer ring gear 20, drive the planetary carrier 21 and the connecting plate 16 to rotate in the same direction as a whole, but the speed is significantly reduced. At this time, the replacement cylinder 12 and spiral piece 11 rotate in the same direction but at different speeds.

[0046] Then, the powdered material is poured into the leftmost side of the inner wall of the conveying cylinder 2 through the feed port 3. At this time, the rotating spiral piece 2 18 pushes the material to the right, so that the material is provided to the transition ring 15 and enters the inner ring area of ​​the replacement cylinder 12. Since the rotation speed of the spiral piece 11 is greater than the rotation speed of the replacement cylinder 12, it can be seen here that the rotation speed of the spiral piece 11 is reduced relative to the rotation speed of the replacement cylinder 12. The material can still be driven to the right by the spiral piece 11 and discharged through the discharge port 5;

[0047] Then, when the transition ring 15 and the replacement cylinder 12 are driven and rotated and rubbed against the inner wall of the transport cylinder 2, heat is generated. The heat is absorbed by the kerosene 14, and the kerosene gradually expands in volume, causing the buffer sleeve 13 to be squeezed and deformed, thereby preventing the kerosene 14 from leaking along the junction of the replacement cylinder 12 and the inner wall of the transport cylinder 2. At the same time, the expanded kerosene 14 also provides hydraulic support for the replacement cylinder 12, offsetting part of the weight of the replacement cylinder 12 and reducing the wear between the replacement cylinder 12 and the inner wall of the transport cylinder 2.

[0048] Finally, if the replacement cylinder 12 needs to be replaced, just loosen the bolt 6 and release the connection between the pressure cover 7 and the transport cylinder 2, pull the connecting plate 16, connecting column 17, spiral piece 18, transition ring 15 and replacement cylinder 12 to the left. After replacement, leave a part of the top left side of the outer surface of the replacement cylinder 12 directly below the feed port 3, so that kerosene 14 can be replenished along the gap between the buffer sleeve 13 and the opening of the feed port 3.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A screw conveyor, comprising a bracket (1) and a transport cylinder (2), wherein a gland (7) and a gear box (8) are mounted on one end of the transport cylinder (2), a motor (9) is mounted on one end of the gear box (8), a main shaft (10) is rotatably mounted on the inner wall of the transport cylinder (2) and the gear box (8), a spiral blade (11) is welded on the outer surface of the main shaft (10), the main shaft (10) is driven by the motor (9), and a feed port (3) and a discharge port (5) are mounted on the surface of the transport cylinder (2), characterized in that: A replacement cylinder (12) is rotatably mounted on the middle portion of the inner wall of the transport cylinder (2), a buffer sleeve (13) is movably sleeved on the outer surface of the replacement cylinder (12), a transition ring (15) is fixedly connected to the left side of the replacement cylinder (12), the gear box (8) is fixedly connected to the left side of the pressure cover (7), a planetary reduction transmission gear set (23) is mounted in the inner cavity of the gear box (8), the input end of the planetary reduction transmission gear set (23) is fixedly connected to the main shaft (10), the output end of the planetary reduction transmission gear set (23) is fixedly connected to a connecting plate (16), the right side of the connecting plate (16) is fixedly connected to a connecting column (17), the right side of the connecting column (17) is fixedly connected to the connecting plate (16), and the right side of the connecting column (17) is fixedly connected to the connecting plate (16). The end is fixedly connected to the transition ring (15), the outer surface of the connecting column (17) is fixedly connected with a spiral piece 2 (18), the diameter value of the spiral piece 2 (18) is smaller than the inner diameter value of the transport cylinder (2), the rotation direction of the spiral piece 1 (11) and the replacement cylinder (12) are consistent, the rotation speed of the spiral piece 1 (11) is greater than the rotation speed of the replacement cylinder (12), the buffer sleeve (13) is made of a rubber block, and a group of annular isolation chambers are formed between the buffer sleeve (13) and the inner wall of the transport cylinder (2), the interior of the annular isolation chamber is filled with kerosene (14), the outer surface of the spiral piece 1 (11) is in rotational contact with the interior of the replacement cylinder (12), and the planetary reduction transmission gear The group (23) includes a sun gear (19), an outer gear ring (20), a planetary carrier (21) and a planetary gear (22), wherein the outer gear ring (20) is fixedly connected to the left side of the pressure cover (7), the sun gear (19) is fixedly installed on the outer surface of the main shaft (10), the right end of the planetary carrier (21) is fixedly connected to the connecting plate (16) and is rotatably installed on the inner wall of the pressure cover (7), and multiple groups of planetary gears (22) are rotatably installed on the left side of the planetary carrier (21), and the outer surfaces of the planetary gears (22) are simultaneously meshed with the outer gear ring (20) and the sun gear (19), and the axial cross-section shape of the transition ring (15) is a right triangle. The inclined surface can provide a transition effect between the left side of the inner wall of the transport cylinder (2) and the inner ring surface of the transition ring (15), and the transition ring (15) is located on the right side of the feed port (3). The left side of the transport cylinder (2) is threadedly installed with multiple groups of bolts (6), and is press-fitted with the pressure cover (7) through the bolts (6). The feed port (3) is installed at the leftmost side of the top of the transport cylinder (2), and the discharge port (5) is installed at the rightmost side of the bottom of the transport cylinder (2). There are two connecting columns (17), and the two connecting columns (17) are centrally symmetrically distributed with respect to the rotation axis of the spiral plate 2 (18). The connecting column (17) passes through the surface of the spiral plate 2 (18).

2. A screw conveyor according to claim 1, characterized in that: A set of heat-insulating sleeves (4) is sheathed on the middle part of the outer surface of the transport cylinder (2). The heat-insulating sleeves (4) are made of extruded polystyrene foam plastics, molded polystyrene foam plastics or chemical foamed cement board.

3. A screw conveyor according to claim 2, characterized in that: The number of the planetary gears (22) is at least three and they are equidistantly distributed between the sun gear (19) and the outer ring gear (20) on the circumference.

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