A twin-screw extruder

Abstract

The utility model discloses a double screw extruder, including the multiple machine cylinders of setting in series in proper order, at least partial machine cylinder is equipped with cooling water channel, and the parallelly connected setting between each cooling water channel, cooling water channel includes first liquid inlet, second liquid inlet, first water channel, second water channel, first liquid outlet and second liquid outlet, first liquid inlet and second liquid outlet set up in one end of machine cylinder, and second liquid inlet and first liquid outlet set up in the other end of machine cylinder, and first water channel is connected between first liquid inlet and first liquid outlet, and second water channel is connected between second liquid inlet and second liquid outlet, makes the cooling liquid flow direction in first water channel and second water channel opposite. The double screw extruder can realize the quick and even heat dissipation cooling between each machine cylinder, and realizes the even heat dissipation cooling everywhere of machine cylinder, effectively prevents the situation that the local thermal deformation of machine cylinder is too big because of uneven heating to occur, makes the service life of extruder longer.

Description

Technical Field

[0001] This utility model belongs to the field of extruder heat dissipation and cooling technology, and specifically relates to a twin-screw extruder. Background Technology

[0002] When using a co-rotating twin-screw extruder to prepare plastic raw materials, the plastic raw materials usually undergo chemical reactions inside the extruder barrel. Some of these chemical reactions release a large amount of heat. If this heat cannot be displaced from the inside of the extruder barrel in time, it will cause the temperature inside the barrel to rise sharply, thus affecting the quality of the produced plastic. For example, it may cause defects such as yellowing or black spots in the product.

[0003] Currently, the method for cooling the extruder barrel is to install cooling water channels in each barrel, which are connected in series. This ensures that the barrel near the inlet receives sufficient cooling, while the barrel far from the inlet cannot be cooled in time, resulting in poor uniformity of heat dissipation. Furthermore, because only the barrel near the inlet is effectively cooled, the parts of the barrel far from the inlet will experience greater thermal deformation, which will seriously affect the service life of the extruder in the long run. Utility Model Content

[0004] To address the aforementioned problems, this utility model discloses a twin-screw extruder to overcome or at least partially solve these problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model discloses a twin-screw extruder, comprising a plurality of barrels arranged in series, wherein at least a portion of the barrels are provided with cooling water channels, and the cooling water channels are arranged in parallel. The cooling water channel includes a first inlet, a second inlet, a first water channel, a second water channel, a first outlet, and a second outlet; the first inlet and the second outlet are adjacent to each other at one end of the barrel and located on one radial side of the barrel, and the second inlet and the first outlet are adjacent to each other at the other end of the barrel and located on the other radial side of the barrel, the first water channel is connected between the first inlet and the first outlet, and the second water channel is connected between the second inlet and the second outlet, so that the coolant in the first water channel and the second water channel flows in opposite directions; The first waterway includes a plurality of first axial waterways distributed circumferentially, each of the first axial waterways extending along the axial direction of the barrel and being alternately connected at both ends of the barrel via first turning waterways; the second waterway includes a plurality of second axial waterways distributed circumferentially, each of the second axial waterways extending along the axial direction of the barrel and being alternately connected at both ends of the barrel via second turning waterways.

[0006] Furthermore, the first axial waterway includes a plurality of first axial branch waterways arranged in parallel, with each first axial branch waterway spaced apart; the second axial waterway includes a plurality of second axial branch waterways arranged in parallel, with each second axial branch waterway spaced apart.

[0007] Furthermore, a plurality of first threaded grooves are formed on the inner wall of the first axial channel, and the first threaded grooves extend along the axial direction of the first axial channel; a plurality of second threaded grooves are formed on the inner wall of the second axial channel, and the second threaded grooves extend along the axial direction of the second axial channel.

[0008] Furthermore, both the first axial water channel and the second axial water channel extend in an S-shape along the axial direction of the barrel.

[0009] Furthermore, both the first axial water channel and the second axial water channel are provided with turbulence ridges, which are used to disturb the flow of coolant.

[0010] Furthermore, the barrel includes a first connecting plate, a sleeve, and a second connecting plate; The first connecting plate and the second connecting plate are respectively fixed at both ends of the sleeve. The first axial water channel and the second axial water channel are both formed inside the sleeve wall. The end faces of the first connecting plate and the second connecting plate are respectively provided with a first turning groove and a second turning groove. The two ends of the first axial water channel are respectively connected to the bottom of the first turning groove on the first connecting plate and the second connecting plate. The two ends of the second axial water channel are respectively connected to the bottom of the second turning groove on the first connecting plate and the second connecting plate. The opening of the first turning groove is welded and sealed with a first groove cover. The opening of the second turning groove is welded and sealed with a second groove cover. The first turning groove and the first groove cover constitute the first turning water channel. The second turning groove and the second groove cover constitute the second turning water channel.

[0011] Furthermore, a first support ladder for supporting the first groove cover is formed in the first turning groove, and a second support ladder for supporting the second groove cover is formed in the second turning groove. Both the first and second slot covers are composed of a rectangular portion and an isosceles trapezoidal portion. The bottom of the isosceles trapezoidal portion is fixedly connected to the top of the rectangular portion. The lower part of the rectangular portion of the first slot cover abuts against the first supporting ladder, and the lower part of the rectangular portion of the second slot cover abuts against the second supporting ladder.

[0012] Furthermore, the first liquid inlet and the second liquid outlet are formed on the first connecting plate, and the second liquid inlet and the first liquid outlet are formed on the second connecting plate.

[0013] Furthermore, a first temperature measuring element is provided on the barrel at the first water channel, and a first solenoid valve is connected to the first liquid inlet, with the first temperature measuring element and the first solenoid valve being electrically connected; a second temperature measuring element is provided on the barrel at the second water channel, and a second solenoid valve is connected to the second liquid inlet, with the second temperature measuring element and the second solenoid valve being electrically connected.

[0014] Furthermore, a first check valve is provided between the first inlet and the first solenoid valve, so that the coolant can only flow from the first solenoid valve to the first inlet; a second check valve is provided between the second inlet and the second solenoid valve, so that the coolant can only flow from the second solenoid valve to the second inlet.

[0015] The advantages and beneficial effects of this utility model are: In this twin-screw extruder, by setting a first water channel and a second water channel in each barrel, coolant flows from one end of the barrel into the first water channel and from the other end into the second water channel. The coolant flows in opposite directions in the first and second water channels, which ensures uniform and rapid cooling of each barrel. This effectively prevents excessive local thermal deformation of the barrel due to uneven heating, thereby extending the service life of the extruder. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a perspective structural view of a barrel of a twin-screw extruder in one embodiment of the present invention; Figure 2 This is a schematic diagram of the cooling water channel in one embodiment of the present invention; Figure 3 This is a cross-sectional view of the first or second slot cover along the length direction in one embodiment of the present invention; Figure 4 for Figure 1 A partial cross-sectional view at point AA.

[0017] In the figure: 1. First liquid inlet; 2. Second liquid inlet; 3. First water channel; 4. Second water channel; 5. First liquid outlet; 6. Second liquid outlet; 7. First axial water channel; 8. First turning water channel; 9. Second axial water channel; 10. Second turning water channel; 11. First connecting plate; 12. Sleeve; 13. Second connecting plate; 14. First temperature measuring element; 15. Second temperature measuring element; 16. First axial branch water channel; 17. Second axial branch water channel; 18. First tank cover; 18-1. Rectangular part; 18-2. Isosceles trapezoidal part; 19. First turning groove; 20. First supporting platform. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "level", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0023] Twin-screw extruders typically include multiple barrels connected in series. In existing twin-screw extruders, at least some barrels are equipped with cooling water channels, which are connected in parallel. That is, the barrels with cooling water channels have independent liquid inlets and outlets. The liquid inlets and outlets on each barrel are directly connected to liquid cooling equipment. The cooling water channels do not interfere with or affect each other and can simultaneously obtain coolant at the same temperature for heat dissipation and cooling.

[0024] On the one hand, since each barrel can directly obtain coolant at a lower temperature, each barrel can cool down and dissipate heat quickly, preventing the quality of the plastic inside the extruder from deteriorating. On the other hand, since each barrel obtains coolant at the same temperature and at the same time, each barrel can cool down simultaneously, ensuring the synchronicity of cooling and preventing excessive thermal deformation of individual barrels due to uneven cooling.

[0025] One embodiment of this utility model provides a twin-screw extruder, such as... Figure 1 and Figure 2 As shown, the cooling water channels in this twin-screw extruder include a first inlet 1, a second inlet 2, a first channel 3, a second channel 4, a first outlet 5, and a second outlet 6. The first inlet 1 and the second outlet 6 are located at one end of the barrel, while the second inlet 2 and the first outlet 5 are located at the other end of the barrel. The first channel 3 connects the first inlet 1 and the first outlet 5, and the second channel 4 connects the second inlet 2 and the second outlet 6, such that the coolant flows in opposite directions in the first channel 3 and the second channel 4. Preferably, the structures of the first channel 3 and the second channel 4 are identical and symmetrically arranged along the radial axis of the barrel.

[0026] Understandably, the coolant enters the first water channel 3 through the first inlet 1 at the first end of the barrel, and is discharged through the first outlet 5 at the second end of the barrel. The coolant enters the second water channel 4 through the second inlet 2 at the second end of the barrel, and is discharged through the second outlet 6 at the first end of the barrel. This allows both ends of the barrel to simultaneously receive cooler coolant, which not only enables the barrel to cool down quickly, but also prevents excessive local thermal deformation of the barrel due to uneven cooling at both ends.

[0027] Furthermore, the first liquid inlet 1 and the second liquid outlet 6 are arranged adjacent to each other and located on one radial side of the barrel, while the second liquid inlet 2 and the first liquid outlet 5 are arranged adjacent to each other and located on the other radial side of the barrel. For example, as Figure 1 and Figure 2 As shown, the first liquid inlet 1 and the second liquid outlet 6 are both located on the lower side of the barrel, while the second liquid inlet 2 and the first liquid outlet 5 are both located on the upper side of the barrel.

[0028] Understandably, as the coolant absorbs heat from the barrel during its flow in the first channel 3 and the second channel 4, the coolant temperature at the first inlet 1 is lower than that at the second outlet 6, and the coolant temperature at the second inlet 2 is lower than that at the first outlet 5. The first inlet 1 and the second outlet 6 are arranged adjacent to each other, and the second inlet 2 and the first outlet 5 are arranged adjacent to each other, so that the heat absorption range of the coolant at the first inlet 1 covers the area around the second outlet 6, and the heat absorption range of the coolant at the second inlet 2 covers the area around the first outlet 5, thereby ensuring uniform cooling at both ends of the barrel.

[0029] In addition, such as Figure 2 As shown, the first water channel 3 includes multiple circumferentially distributed first axial water channels 7, each extending along the axial direction of the barrel and alternately connected at both ends of the barrel via first turning water channels 8. The second water channel 4 includes multiple circumferentially distributed second axial water channels 9, each extending along the axial direction of the barrel and alternately connected at both ends of the barrel via second turning water channels 10. It should be noted that the first turning water channels 8 and the second turning water channels 10 are curved circumferentially along the barrel, and the curvature is consistent with the circumferential curvature of the barrel wall. Understandably, the first axial water channels 7 and the second axial water channels 9 absorb heat from the middle of the barrel, while the first turning water channels 8 and the second turning water channels 10 absorb the main heat from both ends of the barrel, enabling the entire barrel to cool down quickly and uniformly.

[0030] Understandably, the first axial channel 7 and the first turning channel 8 are connected to form a continuous S-shape, and the first channel 3 of this S-shape is distributed on one half of the circumference of the barrel, for example... Figure 2On the left half of the barrel, the second axial channel 9 and the second turning channel 10 connect to form a continuous S-shape. The second channel 4 of this S-shape is distributed on the other half of the barrel, for example... Figure 2 The right half of the barrel is arranged so that the first water channel 3 and the second water channel 4 are distributed in combination throughout the entire circumference of the barrel, so that the barrel can be cooled by the coolant and the heat dissipation is uniform.

[0031] In this embodiment, as Figure 1 As shown, the barrel includes a first connecting plate 11, a sleeve 12, and a second connecting plate 13. The first connecting plate 11 and the second connecting plate 13 are respectively fixed to both ends of the sleeve 12. Adjacent barrels are fixed together by the connecting plates, and adjacent barrels can be connected together by the connecting plates.

[0032] The first axial waterway 7 and the second axial waterway 9 are formed on the sleeve 12, and the first turning waterway 8 and the second turning waterway 10 are both formed on the first connecting plate 11 and the second connecting plate 13.

[0033] Specifically, the first axial channel 7 and the second axial channel 9 are both formed inside the cylinder wall of the sleeve 12. The end faces of the first connecting plate 11 and the second connecting plate 13 are each provided with a first turning groove and a second turning groove. The two ends of the first axial channel 7 are respectively connected to the bottom of the first turning groove on the first connecting plate 11 and the bottom of the first turning groove on the second connecting plate 13, that is, the two first turning grooves are connected through the first axial channel 7. The two ends of the second axial channel 9 are respectively connected to the bottom of the second turning groove on the first connecting plate 11 and the bottom of the second turning groove on the second connecting plate 13, that is, the two second turning grooves are connected through the second axial channel 9. The opening of the first turning groove is welded and sealed with a first groove cover. The first turning groove and the first groove cover constitute the first turning channel 8. The opening of the second turning groove is welded and sealed with a second groove cover. The second turning groove and the second groove cover constitute the second turning channel 10. The first turning groove and the first groove cover constitute the first turning waterway 8, and the second turning groove and the second groove cover constitute the second turning waterway 10, which are existing technologies. For details, please refer to the groove and circular cover structure in the patent application (application number: CN202121339286.8).

[0034] In forming the cooling water channel in this embodiment, a first axial water channel 7 and a second axial water channel 9 are first formed on the sleeve 12; then, a first turning groove and a second turning groove are formed on the end faces of the first connecting plate 11 and the second connecting plate 13; then, the first connecting plate 11 and the second connecting plate 13 are respectively fixed to both ends of the sleeve 12; finally, the first groove cover and the second groove cover are respectively sealed on the first turning groove and the second turning groove, thus forming the cooling water channel structure. This structure can reduce the processing difficulty of the cooling water channel and reduce the processing cost of the cooling water channel.

[0035] Of course, in other embodiments, if the barrel only includes a sleeve, then the first axial channel, the second axial channel, the first bend channel, and the second bend channel can all be formed on the sleeve.

[0036] In this embodiment, a first support ladder is formed in the first turning groove to support the first groove cover, and a second support ladder is formed in the second turning groove to support the second groove cover. The first and second support ladders play a supporting role and can prevent the groove cover from falling to the bottom of the groove when it is placed on the turning groove.

[0037] In addition, such as Figure 3 and Figure 4 As shown, the first slot cover 18 is composed of a rectangular portion 18-1 and an isosceles trapezoidal portion 18-2, and the second slot cover is also composed of a rectangular portion and an isosceles trapezoidal portion. The bottom of the isosceles trapezoidal portion 18-2 is fixedly connected to the upper part of the rectangular portion 18-1. The lower part of the rectangular portion 18-1 of the first slot cover 18 abuts against the first supporting trapezoidal platform 20, and the lower part of the rectangular portion of the second slot cover abuts against the second supporting trapezoidal platform, thereby supporting the first slot cover 18 at the opening of the first turning groove 19 and the second slot cover at the opening of the second turning groove. When the first slot cover 18 is placed on the opening of the first turning groove 19, a sufficient gap is formed between the isosceles trapezoidal portion 18-2 and the opening of the first turning groove 19, ensuring that sufficient solder can fill the gap during welding, so that the first slot cover 18 can be firmly welded and sealed to the opening of the first turning groove 19; similarly, the structure of the second slot cover also allows the second slot cover to be firmly welded and sealed to the opening of the second turning groove.

[0038] In addition, such as Figure 1 As shown, the first liquid inlet 1 and the second liquid outlet 6 are formed on the first connecting plate 11, and the second liquid inlet 2 and the first liquid outlet 5 are formed on the second connecting plate 13, facilitating the connection of the first liquid inlet 1, the second liquid inlet 2, the first liquid outlet 5, and the second liquid outlet 6 to the liquid cooling equipment, respectively. Of course, the first liquid inlet 1, the second liquid inlet 2, the first liquid outlet 5, and the second liquid outlet 6 can also be disposed on the sleeve 12, which is also within the protection scope of this utility model.

[0039] Furthermore, the first connecting plate 11 and the sleeve 12 are welded together, as are the sleeve 12 and the second connecting plate 13. Welding ensures better sealing of the second turning channel 10 of the first turning channel 8, eliminating the need for sealing components and other structures, thus simplifying the structure of the barrel.

[0040] Of course, in other embodiments, the first connecting plate and the sleeve, as well as the sleeve and the second connecting plate, can be connected by bolts. However, sealing elements need to be provided between the first connecting plate and the sleeve, as well as between the sleeve and the second connecting plate, to ensure the sealing effect and prevent coolant leakage.

[0041] In this embodiment, as Figure 2 As shown, the first axial water channel 7 includes multiple first axial branch water channels 16 arranged in parallel, with intervals between each first axial branch water channel 16, and each first axial branch water channel 16 is arranged along the circumference of the barrel; the second axial water channel 9 includes multiple second axial branch water channels 17 arranged in parallel, with intervals between each second axial branch water channel 17, and each second axial branch water channel 17 is arranged along the circumference of the barrel. In this embodiment, the number of first axial branch water channels 16 and second axial branch water channels 17 is three each. Of course, the number of first axial branch water channels 16 and second axial branch water channels 17 can also be other than three.

[0042] Since the first axial water channel 7 is composed of multiple parallel first axial branch water channels 16, and the second axial water channel 9 is composed of multiple parallel second axial branch water channels 17, the number of first turning water channels 8 and second turning water channels 10 is reduced while ensuring the density of axial water channel arrangement in the circumferential direction of the barrel. This reduces the structural complexity of the first water channel 3 and the second water channel 4, thereby reducing the processing difficulty of the cooling water channels inside the barrel.

[0043] In addition, such as Figure 2 As shown, both the first axial water channel 7 and the second axial water channel 9 are straight water channels, which can further reduce the processing difficulty of the cooling water channels.

[0044] In other embodiments, both the first axial water channel and the second axial water channel can extend in an S-shape along the axial direction of the barrel, so that the heat absorption range covered by the first axial water channel and the second axial water channel is wider.

[0045] In a preferred embodiment, a plurality of first threaded grooves are formed on the inner wall of the first axial channel, and the first threaded grooves extend along the axial direction of the first axial channel; a plurality of second threaded grooves are formed on the inner wall of the second axial channel, and the second threaded grooves extend along the axial direction of the second axial channel.

[0046] Understandably, when the coolant flows in the first and second axial channels, the guiding effect of the threaded grooves (first and second threaded grooves) causes the coolant to rotate during the flow, thereby causing the coolant to turbulent and improving the heat exchange efficiency between the coolant and the barrel. Furthermore, the threaded grooves also increase the contact area between the coolant and the barrel, allowing the barrel to cool down faster.

[0047] In another preferred embodiment, both the first and second axial water channels are provided with turbulence ridges, which are used to turbulent the coolant flow. The turbulence ridges are raised structures within the first and second axial water channels. When the coolant flows to the turbulence ridge, the coolant is turbulent due to the obstruction effect of the ridge, thereby improving the heat exchange efficiency between the coolant and the barrel, enabling the barrel to cool down rapidly.

[0048] The presence of turbulence ridges would make the barrel structure more replicable and more difficult to manufacture. Therefore, turbulence ridges are only placed in the axial waterway, and the barrel can be manufactured by casting.

[0049] In this embodiment, as Figure 1 As shown, a first temperature measuring element 14 is installed on the barrel at the first water channel 3, and a first solenoid valve (not shown) is connected to the first liquid inlet 1. The first temperature measuring element 14 and the first solenoid valve are electrically connected. A second temperature measuring element 15 is installed on the barrel at the second water channel 4, and a second solenoid valve (not shown) is connected to the second liquid inlet 2. The second temperature measuring element 15 and the second solenoid valve are electrically connected. The first temperature measuring element 14 and the second temperature measuring element 15 are temperature sensors.

[0050] The first temperature measuring element 14 and the second temperature measuring element 15 can detect the temperature of the barrel. The first solenoid valve and the second solenoid valve can control the amount of coolant entering the first water channel 3 and the second water channel 4. Through the cooperation of the first temperature measuring element 14 and the first solenoid valve, and the cooperation of the second temperature measuring element 15 and the second solenoid valve, the temperature of the barrel can be controlled within a reasonable range, while ensuring the consistency of temperature in all parts of the barrel.

[0051] For example, when the first temperature sensor 14 detects that the temperature on the barrel at the first water channel 3 is too high, the first solenoid valve will increase its opening degree, allowing more coolant to enter the first water channel 3, thereby increasing the heat dissipation and cooling of the barrel at the first water channel 3; when the second temperature sensor 15 detects that the temperature on the barrel at the second water channel 4 is too low, the second solenoid valve will decrease its opening degree, allowing less coolant to enter the second water channel 4, thereby reducing the heat dissipation and cooling of the barrel at the second water channel 4.

[0052] Furthermore, in this embodiment, the first liquid inlet 1, the second liquid inlet 2, the first liquid outlet 5, and the second liquid outlet 6 are all threaded, allowing the cooling water channels inside the barrel to be quickly and easily connected to the piping on the liquid cooling equipment. Of course, the first liquid inlet 1, the second liquid inlet 2, the first liquid outlet 5, and the second liquid outlet 6 can also all be quick-connect fittings.

[0053] In another embodiment of this utility model, a first check valve is provided between the first inlet and the first solenoid valve, allowing coolant to flow only from the first solenoid valve to the first inlet; a second check valve is provided between the second inlet and the second solenoid valve, allowing coolant to flow only from the second solenoid valve to the second inlet. The first and second check valves prevent high-pressure steam generated by the vaporization of coolant within the barrel from impacting the first and second solenoid valves, thereby protecting them.

[0054] In summary, in the twin-screw extruder of this invention, by setting a first water channel and a second water channel in each barrel, the coolant flows from one end of the barrel into the first water channel and from the other end into the second water channel. Moreover, the coolant flows in opposite directions in the first and second water channels, which ensures uniform and rapid cooling of each barrel. This effectively prevents excessive local thermal deformation of the barrel due to uneven heating, thereby extending the service life of the extruder.

[0055] The above description is merely a specific embodiment of this utility model. Under the teachings of this utility model, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this utility model, and the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A twin-screw extruder, characterized in that, It includes multiple barrels arranged in series, and at least a portion of the barrels are provided with cooling water channels, which are arranged in parallel with each cooling water channel. The cooling water channel includes a first inlet, a second inlet, a first water channel, a second water channel, a first outlet, and a second outlet; the first inlet and the second outlet are adjacent to each other at one end of the barrel and located on one radial side of the barrel, and the second inlet and the first outlet are adjacent to each other at the other end of the barrel and located on the other radial side of the barrel, the first water channel is connected between the first inlet and the first outlet, and the second water channel is connected between the second inlet and the second outlet, so that the coolant in the first water channel and the second water channel flows in opposite directions; The first waterway includes a plurality of first axial waterways distributed circumferentially, each of the first axial waterways extending along the axial direction of the barrel and being alternately connected at both ends of the barrel via first turning waterways; the second waterway includes a plurality of second axial waterways distributed circumferentially, each of the second axial waterways extending along the axial direction of the barrel and being alternately connected at both ends of the barrel via second turning waterways.

2. The twin-screw extruder according to claim 1, characterized in that, The first axial waterway includes a plurality of first axial branch waterways arranged in parallel, with each first axial branch waterway spaced apart; the second axial waterway includes a plurality of second axial branch waterways arranged in parallel, with each second axial branch waterway spaced apart.

3. The twin-screw extruder according to claim 1, characterized in that, A plurality of first threaded grooves are formed on the inner wall of the first axial channel, and the first threaded grooves extend along the axial direction of the first axial channel; a plurality of second threaded grooves are formed on the inner wall of the second axial channel, and the second threaded grooves extend along the axial direction of the second axial channel.

4. The twin-screw extruder according to claim 1, characterized in that, Both the first axial waterway and the second axial waterway are S-shaped and extend along the axial direction of the barrel.

5. The twin-screw extruder according to claim 1, characterized in that, Both the first axial water channel and the second axial water channel are provided with turbulence ridges, which are used to disturb the flow of coolant.

6. The twin-screw extruder according to claim 1, characterized in that, The barrel includes a first connecting plate, a sleeve, and a second connecting plate; The first connecting plate and the second connecting plate are respectively fixed at both ends of the sleeve. The first axial water channel and the second axial water channel are both formed inside the sleeve wall. The end faces of the first connecting plate and the second connecting plate are respectively provided with a first turning groove and a second turning groove. The two ends of the first axial water channel are respectively connected to the bottom of the first turning groove on the first connecting plate and the second connecting plate. The two ends of the second axial water channel are respectively connected to the bottom of the second turning groove on the first connecting plate and the second connecting plate. The opening of the first turning groove is welded and sealed with a first groove cover. The opening of the second turning groove is welded and sealed with a second groove cover. The first turning groove and the first groove cover constitute the first turning water channel. The second turning groove and the second groove cover constitute the second turning water channel.

7. The twin-screw extruder according to claim 6, characterized in that, A first support ladder for supporting the first groove cover is formed in the first turning groove, and a second support ladder for supporting the second groove cover is formed in the second turning groove. Both the first and second slot covers are composed of a rectangular portion and an isosceles trapezoidal portion. The bottom of the isosceles trapezoidal portion is fixedly connected to the top of the rectangular portion. The lower part of the rectangular portion of the first slot cover abuts against the first supporting ladder, and the lower part of the rectangular portion of the second slot cover abuts against the second supporting ladder.

8. The twin-screw extruder according to claim 6, characterized in that, The first liquid inlet and the second liquid outlet are formed on the first connecting plate, and the second liquid inlet and the first liquid outlet are formed on the second connecting plate.

9. The twin-screw extruder according to any one of claims 1 to 8, characterized in that, A first temperature measuring element is provided on the barrel at the first water channel, and a first solenoid valve is connected to the first liquid inlet. The first temperature measuring element and the first solenoid valve are electrically connected. A second temperature measuring element is provided on the barrel at the second water channel, and a second solenoid valve is connected to the second liquid inlet. The second temperature measuring element and the second solenoid valve are electrically connected.

10. The twin-screw extruder according to claim 9, characterized in that, A first check valve is provided between the first inlet and the first solenoid valve, so that the coolant can only flow from the first solenoid valve to the first inlet; a second check valve is provided between the second inlet and the second solenoid valve, so that the coolant can only flow from the second solenoid valve to the second inlet.

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