A screw conveyor and solid particle production line

Abstract

The present invention relates to the technical field of material conveying devices, and provides a screw conveyor and a solid particle production line, wherein the screw conveyor includes a conveying pipe, a screw is arranged inside the conveying pipe, the screw includes a core shaft and a spiral blade, and also includes: a rotary joint, at least one end of the core shaft is provided with a rotary joint, the rotary joint includes a first joint and a second joint that are rotatably connected to each other, the first joint is connected to the core shaft, and the second joint is connected to the conveying pipe; a first flow channel, the first flow channel includes a water inlet section, a heat exchange section and a drainage section that are connected in sequence, the water inlet section and the drainage section are located inside the core shaft, and the inlet of the water inlet section and the outlet of the drainage section are both connected to the first joint; the heat exchange section is located inside the spiral blade; a water pump, and the water outlet of the water pump is connected to the second joint. The present invention can overcome the technical problem that the existing screw conveyor is prone to excessively high temperatures of materials and screws, thereby reducing the production efficiency of the solid particle production line and the conveying efficiency of the screw conveyor.

Description

Technical Field

[0001] The invention relates to the technical field of material conveying devices, and in particular to a screw conveyor and a solid particle production line. Background Art

[0002] A screw conveyor usually includes a transport pipe for accommodating materials, a feeding structure and a discharging structure respectively arranged at both ends of the transport pipe, and a screw rotatably connected to the transport pipe; due to the spiral shape of the screw, the material in the transport pipe can be pushed from one end of the screw to the other end by rotating the screw, so it is often used to transport granular agricultural products such as grains and beans, or to extrude molten or plastic materials so that the materials pass through the discharging structure with a hole mold and form solid particles; and when processing high-temperature materials, such as transporting high-temperature coal particles, or extruding molten hot melt adhesives, in order to cool the materials to meet the requirements of subsequent processes and avoid overheating of the screw, some screw conveyors will also bury cooling channels in the screw and the side walls of the transport pipe, and pass cold water into them to cool the materials, the screw and the transport pipe.

[0003] However, in the current water-cooled screw conveyors, the flow channel in the screw is often just a straight flow channel buried in the central core shaft of the screw, so its cooling range is limited, and it can only quickly take away the heat near the core shaft, but cannot quickly take away the heat in the area away from the core shaft, which easily leads to insufficient material cooling effect or overheating of the screw; the former will cause the subsequent processes to be unable to proceed normally, thereby reducing the production efficiency of the entire solid particle production line; the latter will cause the operator to frequently stop the screw conveyor to wait for the screw to cool, seriously affecting the conveying efficiency of the screw conveyor; and the thickness of the spiral blade farther away from the core shaft is smaller, so overheating of the spiral blade can easily cause deformation or even damage to the tip of the spiral blade, which in turn causes the screw conveyor to malfunction and incur additional maintenance costs. Therefore, it is urgent to develop a new type of screw conveyor. Summary of the invention

[0004] The purpose of the present invention is to overcome the technical problem that the existing screw conveyor has a limited cooling range when conveying high-temperature materials, and it is easy for the material and screw temperatures to be too high, thereby reducing the production efficiency of the solid particle production line and the conveying efficiency of the screw conveyor, and to provide a screw conveyor and a solid particle production line.

[0005] In a first aspect, the present invention provides a screw conveyor, comprising a conveying pipe, a screw rod disposed in the conveying pipe, the screw rod comprising a core shaft and a spiral blade, the core shaft being rotatably connected to the conveying pipe, the spiral blade being connected to the core shaft, and further comprising: A rotary joint, wherein at least one end of the core shaft is provided with a rotary joint, and the rotary joint comprises a first joint and a second joint which are rotatably connected to each other, the first joint is connected to the core shaft, and the second joint is connected to the delivery pipe; A first flow channel, the first flow channel comprises a water inlet section, a heat exchange section and a drainage section which are connected in sequence, the water inlet section and the drainage section are located inside the core shaft, the inlet of the water inlet section and the outlet of the drainage section are both connected to the first joint; the heat exchange section is located inside the spiral blade; A water pump, wherein a water outlet of the water pump is communicated with the second joint.

[0006] This solution introduces a first flow channel into the screw, and the first flow channel includes a water inlet section and a water discharge section buried in the core shaft, and a heat exchange section buried in the spiral blades. When a cooling medium, such as water or fluorinated liquid, is introduced into the first flow channel through a water pump, the cooling medium will first enter the core shaft through a rotary joint, then flow through the spiral blades, and then flow back to the core shaft, and return to the water pump through the rotary joint or be directly discharged. The rotary joint is a prior art that can prevent the pipeline between the screw and the water pump from being tangled due to the rotation of the screw. Therefore, this solution enables the cooling medium to flow through both the core shaft and the spiral blades. On the one hand, it expands the cooling range of the screw, so that the screw can cool both the material in contact with the core shaft and the material in contact with the spiral blades, thereby ensuring the cooling effect of the material and avoiding the situation where the subsequent process cannot be carried out due to the excessive temperature of the material. On the other hand, it can also more effectively avoid overheating of the screw and the shutdown or maintenance caused by overheating of the screw, which is conducive to maintaining a high transportation efficiency and a low use cost for the screw conveyor.

[0007] Preferably, the number of the first flow channels is at least two, and the first flow channels are distributed at intervals along the length direction of the spiral blade; the water inlet section and the water discharge section of each first flow channel are staggered in position along the circumference of the core shaft.

[0008] The present solution sets at least two first flow channels in the spiral blade, which can reduce the length of a single first flow channel. On the one hand, it can reduce the difficulty of producing the first flow channel. On the other hand, it can prevent the first flow channel from being too long, which causes the cooling medium to absorb too much heat and cause the temperature to be too high when it flows to the rear section of the first flow channel, thereby causing the cooling efficiency to decrease. The shorter first flow channel can also reduce the resistance encountered by the cooling medium when flowing in the first flow channel, which is conducive to allowing the cooling medium to flow more quickly and smoothly in the first flow channel.

[0009] At the same time, this solution also makes the water inlet section and the drainage section of each first flow channel spaced apart along the circumference of the core shaft. On the one hand, it can avoid mutual interference between the water inlet section and the drainage section of each flow channel, thereby reducing the difficulty of designing and producing the first flow channel. On the other hand, it can also make the water inlet section and the drainage section evenly cool the four sides of the core shaft along the circumference of the core shaft, thereby preventing the core shaft from being deformed or even damaged due to uneven heating and cooling.

[0010] Preferably, rotating joints are provided at both ends of the core shaft; the water inlet section and the drainage section are respectively located on both sides of the heat exchange section along the length direction of the core shaft, and the water inlet section and the drainage section are respectively connected to the first joints on the corresponding sides.

[0011] In this solution, rotary joints are provided at both ends of the core shaft, and the water inlet section and the drainage section of the first flow channel are respectively connected to the first joints on both sides. Compared with only providing a rotary joint at one end of the core shaft, on the one hand, this solution can reduce the number of pipes required to be connected to a single rotary joint, thereby reducing the size of the rotary joint and making the volume of this solution more compact; on the other hand, there is no need to provide a turning section for the first flow channel to make the drainage section turn around and return to the rotary joint at the starting point, which is conducive to simplifying the shape of the first flow channel, thereby reducing the difficulty of producing and manufacturing the first flow channel and the resistance of the cooling medium to flow in the first flow channel.

[0012] Preferably, the water inlet sections of two adjacent first flow channels are respectively located at two ends of the core shaft along the length direction of the core shaft.

[0013] Since the cooling medium absorbs heat, the temperature of the drainage section will be higher than that of the water inlet section. If the drainage sections of all the first flow channels are located at the same end of the core shaft, the temperature at the other end of the core shaft will be higher and the cooling efficiency will be low. Therefore, this solution arranges the water inlet sections of two adjacent first flow channels in reverse. For example, if the water inlet section of a first flow channel is located on the left side of the core shaft, the water inlet section of the adjacent first flow channel is located on the right side of the core shaft, so that both ends of the core shaft are distributed with water inlet sections with lower temperatures, thereby ensuring that both ends of the core shaft have higher cooling efficiency, preventing the core shaft from being deformed or even damaged due to uneven heating and cooling, and preventing the cooling efficiency from being low in some positions.

[0014] Preferably, the distance from the water inlet section to the axis of the core shaft is smaller than the distance from the water outlet section to the axis of the core shaft.

[0015] This solution makes the water inlet section of the first flow channel located in the deep layer of the core shaft, while the drainage section is located in the shallow layer of the core shaft. On the one hand, it can reduce the heat absorbed by the cooling medium when flowing in the water inlet section, so that the cooling medium still has a low temperature when reaching the heat exchange section, and can efficiently exchange heat with the spiral blades, thereby ensuring that the spiral blades have a high cooling efficiency; on the other hand, it can form a more uniform temperature gradient on the core shaft, with the temperature decreasing as it approaches the center of the core shaft, thereby making the thermal stress distribution inside the core shaft more uniform, preventing the core shaft from being deformed or even damaged due to uneven heating and cooling.

[0016] Preferably, a second flow channel is further provided inside the core shaft, and the second flow channel is provided along the length direction of the core shaft, and the inlet and the outlet of the second flow channel are both connected to the first joint.

[0017] This solution adds a second flow channel specifically used for cooling the mandrel, which can further improve the cooling efficiency of the mandrel.

[0018] Preferably, the heat exchange section comprises at least two U-shaped sections communicating with each other.

[0019] This solution can increase the contact area between the heat exchange section and the spiral blade, thereby improving the cooling efficiency of the spiral blade.

[0020] Preferably, the number of the screws is greater than one, and the screws are arranged at intervals along the length direction of the conveying tube.

[0021] This solution arranges two or more screws in the conveying pipe, which can reduce the length of a single screw and the first flow channel inside it. On the one hand, it can reduce the difficulty of producing the screw and the first flow channel. On the other hand, it can also reduce the temperature rise of the cooling medium when it flows to the rear section of the first flow channel, as well as the flow resistance of the cooling medium in the first flow channel, which is beneficial to ensure that the entire section of the first flow channel has a higher cooling efficiency.

[0022] Preferably, a third flow channel is provided in the side wall of the delivery pipe, and an inlet of the third flow channel is connected to the water pump.

[0023] This solution can take away the heat in the screw conveyor from the side wall of the conveying pipe, thereby further reducing the possibility of overheating of the screw.

[0024] In a second aspect, the present invention provides a solid particle production line, comprising a screw conveyor of the present invention.

[0025] The solid particle production line of the present invention can use the screw conveyor of the present invention to convey solid particles, or when extruding high-temperature materials, it can avoid overheating of the screw during the conveying process. Therefore, the present invention does not need to frequently shut down and maintain the screw conveyor as in the prior art, and has higher operating efficiency and lower operating costs.

[0026] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a screw conveyor. By arranging a water inlet section and a drainage section in a core shaft, arranging a heat exchange section in a spiral blade, and connecting a water pump, a rotary joint, a water inlet section, a heat exchange section, and a drainage section in sequence, a cooling medium can flow through both the core shaft and the spiral blade, thereby, on the one hand, improving the cooling efficiency of the material and avoiding the situation that the subsequent process cannot be carried out due to excessively high material temperature. On the other hand, it can also effectively avoid overheating of the screw and shutdown or maintenance caused by overheating of the screw, thereby helping to maintain a high transportation efficiency and a low use cost of the screw conveyor.

[0027] 2. The present invention provides a solid particle production line. By using the screw conveyor of the present invention to convey solid particles or extrude high-temperature materials, overheating of the screw during the conveying process can be avoided. There is no need to frequently shut down and maintain the screw conveyor as in the prior art, and the production line has higher operating efficiency and lower operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural schematic diagram of a screw conveyor of the present invention; Figure 2 It is a side cross-sectional structural schematic diagram of a screw conveyor of the present invention; Figure 3 It is a partial perspective structural schematic diagram of a screw of a screw conveyor of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of a first flow channel of a screw conveyor of the present invention; Figure 5 It is a front view structural schematic diagram of a first flow channel of a screw conveyor of the present invention; Figure 6 yes Figure 5 A partial enlarged structural diagram of the water intake section and the discharge section; icon: 1- conveying pipe; 11- feeding structure; 12- discharging structure; 2-screw; 21-core shaft; 211-second flow channel; 22-spiral blade; 3- Rotary joint; 4-first flow channel; 41-water inlet section; 42-heat exchange section; 43-drainage section; 5- Driving device. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0030] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0032] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0033] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0034] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0035] Example 1 like Figures 1 to 6 As shown, a screw conveyor comprises a conveying pipe 1, a screw 2, a rotary joint 3, a first flow channel 4, a water pump and a driving device 5; a feeding structure 11 is arranged at one end of the conveying pipe 1, and a discharging structure 12 is arranged at the other end; the screw 2 is located inside the conveying pipe 1, and the screw 2 comprises a core shaft 21 and a spiral blade 22, the core shaft 21 is rotatably connected to the conveying pipe 1, and the spiral blade 22 is connected to the core shaft 21; at least one end of the core shaft 21 is provided with a rotary joint 3, and the rotary joint 3 comprises mutually rotatably connected, and the internal parts are mutually connected The first joint and the second joint are connected, the first joint is connected to the core shaft 21, and the second joint is connected to the delivery pipe 1; the first flow channel 4 includes a water inlet section 41, a heat exchange section 42 and a drainage section 43 which are connected in sequence, the water inlet section 41 and the drainage section 43 are located inside the core shaft 21, and the inlet of the water inlet section 41 and the outlet of the drainage section 43 are both connected to the first joint; the heat exchange section 42 is located inside the spiral blade 22; the water outlet of the water pump is connected to the second joint; the driving device 5 is connected to the screw 2, and is used to drive the screw 2 to rotate.

[0036] It should be noted that since the first flow channel 4 is located inside the screw 2, Figure 1 and Figure 3 The screw 2 is rendered semi-transparent so as to simultaneously display the first flow channel 4 and the screw 2 .

[0037] In the above embodiment, the first flow channel 4 can be a hole structure directly processed inside the screw 2, or an independent tubular component connected to the screw 2; and the cross-sectional shape of the first flow channel 4 includes but is not limited to circular, elliptical, square, track-shaped, and polygonal.

[0038] In the above embodiment, the specific forms of the feeding structure 11 and the discharging structure 12 include but are not limited to a hole structure, a funnel structure, a slope structure, and a groove structure; and if the material needs to be extruded, a hole mold can also be set at the discharging structure 12.

[0039] In the above embodiment, the rotary joint 3 and the driving device 5 can directly adopt existing products, and the driving device 5 includes but is not limited to a servo motor, a stepping motor, an internal combustion engine, and a rotary cylinder.

[0040] In an optional embodiment, the number of the first flow channels 4 is at least two, and the first flow channels 4 are spaced apart along the length direction of the spiral blade 22; the water inlet section 41 and the water outlet section 43 of each first flow channel 4 are staggered along the circumference of the core shaft 21. Figure 5 and Figure 6As shown, taking the case where there are two first flow channels 4 as an example, it can be seen that the water inlet section 41 and the water discharge section 43 of the two first flow channels 4 are located at different positions along the circumference of the core shaft 21, thereby avoiding mutual interference between the two adjacent first flow channels 4 in the core shaft 21 and cooling the core shaft 21 more evenly along the circumference of the core shaft 21.

[0041] It should be noted that in Figure 3 In the embodiment, a first flow channel 4 includes only five U-shaped segments. Figures 4 to 6 In the figure, each first flow channel 4 includes only two U-shaped segments, which is simplified to avoid the shape of the first flow channel 4 being too complicated and making it difficult to identify the features from the drawings; in the actual design process, a single first flow channel 4 may include two or more U-shaped segments or flow channel segments of other shapes.

[0042] In an optional embodiment, both ends of the core shaft 21 are provided with a rotary joint 3; the water inlet section 41 and the drainage section 43 are respectively located on both sides of the heat exchange section 42 along the length direction of the core shaft 21, and the water inlet section 41 and the drainage section 43 are respectively connected to the first joint on the corresponding side. Figure 2 As shown; when a rotary joint 3 is provided at both ends of the mandrel 21, in order to facilitate the connection between the mandrel 21 and the driving device 5, a gear or a pulley may be coaxially provided at the area where the mandrel 21 is exposed from the conveying pipe 1, and connected to the driving device 5 through the gear or the pulley.

[0043] In an optional embodiment, the water inlet sections 41 of two adjacent first flow channels 4 are respectively located at two ends of the core shaft 21 along the length direction of the core shaft 21. Figure 4 As shown, taking the case where the number of first flow channels 4 is two as an example, it can be seen that the water inlet section 41 of one of the first flow channels 4 is located at Figure 4 The left side of the drainage section 43 is located Figure 4 and the other first flow channel 4 inlet section 41 is located at Figure 4 The right side of the drain section 43 is located Figure 4 on the left side of the .

[0044] In an optional embodiment, the distance between the water inlet section 41 and the axis of the core shaft 21 is smaller than the distance between the water outlet section 43 and the axis of the core shaft 21. Figure 6 As shown, the distance between the axis of the water inlet section 41 and the axis of the core shaft 21 is R2, the distance between the axis of the water discharge section 43 and the axis of the core shaft 21 is R1, and R2 is smaller than R1.

[0045] In an optional embodiment, a second flow channel 211 is further provided inside the core shaft 21, and the second flow channel 211 is provided along the length direction of the core shaft 21, and the inlet and outlet of the second flow channel 211 are both connected to the first joint. Figure 6As shown, one or more second flow channels 211 may be provided at the center of the core shaft 21 along the length direction of the core shaft 21 . The second flow channels 211 do not pass through the spiral blades 22 , and can cool the core shaft 21 directly from the center of the core shaft 21 .

[0046] In the above embodiment, the second flow channel 211 can be a hole structure directly processed inside the core shaft 21, or an independent tubular component connected to the core shaft 21; and the cross-sectional shape of the second flow channel 211 includes but is not limited to circular, elliptical, square, track-shaped, and polygonal.

[0047] In an optional embodiment, the heat exchange section 42 includes at least two interconnected U-shaped sections, for example Figure 5 As shown, the heat exchange section 42 includes at least two interconnected U-shaped sections.

[0048] In an optional embodiment, the number of screws 2 is greater than one, and the screws 2 are arranged at intervals along the length direction of the conveying tube 1. Figure 2 As shown, the conveying pipe 1 includes two coaxially arranged screws 2, and both screws 2 are provided with independent first flow channels 4 and rotary joints 3, thereby reducing the length of the first flow channel 4 in a single screw 2 and the difficulty of processing.

[0049] In an optional embodiment, a third flow channel is provided in the side wall of the delivery pipe 1, and the inlet of the third flow channel is connected to the water pump. The specific arrangement of the third flow channel includes but is not limited to: being arranged along the length direction of the delivery pipe 1 relative to the entire length of the delivery pipe 1, surrounding the outer wall of the delivery pipe 1 along the circumference of the delivery pipe 1, and winding around the outer wall of the delivery pipe 1 in a serpentine shape.

[0050] In the above embodiment, the third flow channel can be a hole structure directly processed inside the side wall of the conveying pipe 1, or it can be an independent tubular component connected to the core shaft 21; and the cross-sectional shape of the third flow channel includes but is not limited to circular, elliptical, square, racetrack, and polygonal.

[0051] In an optional embodiment, due to the complex shape of the spiral blade 22, it is difficult to drill a hole directly in the spiral blade 22 to form the heat exchange section 42; therefore, the spiral blade 22 can be set to a hollow structure, and the heat exchange section 42 is a tubular component independent of the spiral blade 22. The heat exchange section 42 is installed in the inner cavity of the spiral blade 22, and the heat exchange section 42 and the inner cavity of the spiral blade 22 are filled with heat conductive materials, such as thermal grease, aluminum powder, and copper powder, to ensure that the heat exchange section 42 can fully contact and exchange heat with the spiral blade 22.

[0052] In an optional embodiment, the shapes of the water inlet section 41 and the drainage section 43 are simple, so holes can be drilled in the core shaft 21 along the length direction of the core shaft 21 and the drilled holes are used as the water inlet section 41 or the drainage section 43.

[0053] Example 2 A solid particle production line includes a screw conveyor in Example 1. The solid particles include but are not limited to plastic particles, hot melt adhesive particles, metal particles, and mineral particles.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw conveyor, comprising a conveying pipe (1), wherein a screw (2) is arranged in the conveying pipe (1), wherein the screw (2) comprises a core shaft (21) and a spiral blade (22), wherein the core shaft (21) is rotatably connected to the conveying pipe (1), and the spiral blade (22) is connected to the core shaft (21), wherein: Also includes: a rotary joint (3), wherein at least one end of the core shaft (21) is provided with the rotary joint (3), the rotary joint (3) comprising a first joint and a second joint which are rotatably connected to each other, the first joint being connected to the core shaft (21), and the second joint being connected to the delivery pipe (1); a first flow channel (4), the first flow channel (4) comprising a water inlet section (41), a heat exchange section (42) and a drainage section (43) which are connected in sequence, the water inlet section (41) and the drainage section (43) being located inside the core shaft (21), the inlet of the water inlet section (41) and the outlet of the drainage section (43) both being connected to the first joint; the heat exchange section (42) being located inside the spiral blade (22); A water pump, wherein the water outlet of the water pump is connected to the second joint.

2. A screw conveyor according to claim 1, characterized in that: The number of the first flow channels (4) is at least two, and the first flow channels (4) are spaced apart along the length direction of the spiral blade (22); the water inlet section (41) and the water discharge section (43) of each first flow channel (4) are staggered in position along the circumference of the core shaft (21).

3. A screw conveyor according to claim 2, characterized in that: The rotating joints (3) are provided at both ends of the core shaft (21); the water inlet section (41) and the water discharge section (43) are respectively located on both sides of the heat exchange section (42) along the length direction of the core shaft (21); the water inlet section (41) and the water discharge section (43) are respectively connected to the first joints on the corresponding sides.

4. A screw conveyor according to claim 3, characterized in that: The water inlet sections (41) of two adjacent first flow channels (4) are respectively located at two ends of the core shaft (21) along the length direction of the core shaft (21).

5. The screw conveyor according to claim 1, characterized in that: The distance between the water inlet section (41) and the axis of the core shaft (21) is smaller than the distance between the water outlet section (43) and the axis of the core shaft (21).

6. A screw conveyor according to any one of claims 1 to 5, characterized in that: A second flow channel (211) is also provided inside the core shaft (21), the second flow channel (211) being provided along the length direction of the core shaft (21), and the inlet and outlet of the second flow channel (211) are both in communication with the first joint.

7. A screw conveyor according to any one of claims 1 to 5, characterized in that: The heat exchange section (42) comprises at least two U-shaped sections that are interconnected.

8. A screw conveyor according to any one of claims 1 to 5, characterized in that: The number of the screw rods (2) is greater than one, and the screw rods (2) are arranged at intervals along the length direction of the conveying pipe (1).

9. A screw conveyor according to any one of claims 1 to 5, characterized in that: A third flow channel is provided in the side wall of the delivery pipe (1), and an inlet of the third flow channel is connected to the water pump.

10. A solid particle production line, characterized in that: It comprises a screw conveyor as claimed in any one of claims 1 to 9.

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