Dewatering barrel for extruder

Abstract

A dewatering barrel for an extruder, comprising a barrel (100) and a dewatering mechanism (200). The barrel comprises a barrel wall (101) and an extrusion cavity (110) defined by the barrel wall; the barrel wall is provided with at least one dewatering port (120); the dewatering mechanism comprises a dewatering screen (210) and a fixing device (220); the dewatering screen is arranged in the dewatering port and is fitted to the barrel wall; the fixing device is used for fixing the dewatering screen into the dewatering port; and the dewatering screen comprises at least two plates (211) and at least one drainage channel (212) formed between two adjacent plates. The dewatering barrel can effectively discharge the separated water inside the extruder, so that the processing difficulty of the drainage channels is reduced, and the drainage channels are prevented from being compressed and blocked, thereby avoiding the accumulation of materials in the drainage gaps, and thus enhancing the dewatering effect.

Description

Extruder dehydration barrel TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic raw material powder extrusion dehydration, in particular to an ABS wet extruder dehydration barrel. BACKGROUND

[0002] In the production process of plastics, the upstream chemical raw materials are reacted to form plastic powder, and further made into plastic particles after dehydration, which is the basis for manufacturing various plastic products. However, the newly produced plastic powder often contains a high moisture content, which will affect the quality and performance of the plastic products. In order to ensure that the plastic powder can meet the performance requirements of the products, dehydration treatment must be carried out before making plastic particles.

[0003] At present, the dehydration of plastic powder is usually carried out by using an extruder to separate the water in the powder through heating and plasticizing. This process can be carried out by natural volatilization or using equipment to force the water to volatilize. However, in order to improve the dehydration efficiency, on the one hand, multiple auxiliary equipment is needed, which will lead to an increase in equipment cost, and on the other hand, longer equipment is also needed, which not only increases the cost, but also puts higher requirements on the production space.

[0004] Content of the utility model

[0005] In view of one or more of the problems existing in the prior art, the present application provides an extruder dehydration barrel, characterized in that it comprises a barrel and a dehydration mechanism.

[0006] The barrel comprises a barrel wall, an extrusion cavity formed by the barrel wall, and at least one dehydration port formed in the barrel wall.

[0007] The dehydration mechanism comprises a dehydration screen and a fixing device.

[0008] The dehydration screen is arranged in the dehydration port and is adapted to the barrel wall, and the fixing device is used to fix the dehydration screen in the dehydration port.

[0009] The dehydration screen comprises at least two plates and at least one drainage channel formed between two adjacent plates.

[0010] According to one aspect of the present application, the at least two plates are fixedly connected to each other.

[0011] According to one aspect of the present application, the dehydration screen comprises a plate fixing member, the plate is provided with a positioning hole, and the plate fixing member is fixedly connected to the at least two plates through the positioning hole.

[0012] According to an aspect of the present application, the plate fixing member comprises a pressing bolt and a positioning pin, the positioning pin is arranged in the positioning hole, and the pressing bolt is inserted into the positioning hole and cooperates with the positioning pin to fixedly connect at least two plates.

[0013] According to an aspect of the present application, the drainage channel comprises a first drainage gap, a second drainage gap and a third drainage gap, the first drainage gap is located on the side of the dewatering screen close to the extrusion cavity, the first drainage gap gradually expands outward to form the second drainage gap, and finally expands to form the third drainage gap.

[0014] According to an aspect of the present application, the plate surface is provided with a drainage groove, and the adjacent plate of the plate covers the drainage groove to form the drainage channel.

[0015] Among them, the drainage groove comprises a first drainage groove, a second drainage groove and a third drainage groove, the first drainage groove is located on the side close to the extrusion cavity, the depth of the first drainage groove is smaller than that of the third drainage groove, and the bottom surface of the second drainage groove is inclined to connect the first drainage groove and the third drainage groove.

[0016] According to an aspect of the present application, the length of at least two first drainage gaps in the drainage direction is consistent.

[0017] According to an aspect of the present application, the dewatering screen comprises at least two parallel drainage channels.

[0018] According to an aspect of the present application, the fixing device comprises a convex pressing plate, a convex boss capable of being inserted into the dewatering port is formed in the middle of the convex pressing plate, a dewatering port is arranged in the middle of the convex boss, and the drainage channel communicates with the external space through the dewatering port.

[0019] According to an aspect of the present application, the fixing device further comprises a pressing plate locking bolt, and the convex pressing plate is fixed to the barrel wall through the pressing plate locking bolt.

[0020] According to an aspect of the present application, the opening direction of the dewatering port is 0°-90° with respect to the horizontal radial direction of the extrusion cavity.

[0021] According to an aspect of the present application, the opening direction of the dewatering port is 0° or 90° with respect to the horizontal radial direction of the extrusion cavity.

[0022] According to an aspect of the present application, a cooling water channel is arranged in the barrel, and the cooling water channel is arranged close to the extrusion cavity.

[0023] One or more embodiments of the present application have at least the following beneficial effects:

[0024] The application comprises a dehydration screen fixed by laminating multiple plates, and drainage channels are arranged between the plates, which can effectively drain the separated water in the extruder, and the combined structure of the dehydration screen also reduces the processing difficulty of the drainage channels. When the dehydration screen at different positions is subjected to extrusion pressure, the height of the drainage channels is different, which can ensure that each drainage channel is not tightly blocked. The first drainage gap length of the drainage channels is consistent, thereby reducing the accumulation of materials in the drainage gap and causing blockage. The angle of the dehydration screen can be set as required, which further enhances the dehydration effect.

[0025] The application sets high-density cooling water channels close to the extrusion cavity in the barrel, so as to ensure that the extrusion heat in the barrel is promptly taken away by the cooling water, and the stability of the material temperature is maintained.

[0026] The application not only improves the dehydration efficiency, but also ensures the performance stability of the raw materials in the processing process, which helps to reduce the production cost and improve the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, which together with the embodiments of the application, are used to explain the application, and do not constitute a limitation on the application. In the drawings:

[0028] Fig. 1 is a schematic view of the overall structure of the dehydration barrel of the extruder according to the embodiment of the application;

[0029] Fig. 2 is a schematic view of the barrel structure of the dehydration barrel of the extruder according to the embodiment of the application;

[0030] Fig. 3 is an A-A sectional view of Fig. 1;

[0031] Fig. 4 is a schematic view of the dehydration screen structure of the dehydration barrel of the extruder according to the embodiment of the application;

[0032] Fig. 5 is a B-B sectional view of Fig. 4;

[0033] Fig. 6 is a schematic view of the structure of the plate provided with drainage channels according to the embodiment of the application;

[0034] Fig. 7 is a C-C sectional view of Fig. 4;

[0035] Fig. 8 is an enlarged view of Z in Fig. 7;

[0036] Fig. 9 is a sectional view of the dehydration barrel of the extruder according to another embodiment of the application;

[0037] Fig. 10 is an exploded view of the dehydration barrel structure of the extruder according to still another embodiment of the application.

[0038] Reference signs:

[0039] 100, barrel; 101, barrel wall; 110, extrusion cavity; 120, dehydration port;

[0040] 200, dehydration mechanism; 210, dehydration screen; 211, plate; 212, drainage channel; 212-1, first drainage gap; 212-2, second drainage gap; 212-3, third drainage gap; 212', drainage groove; 212-1', first drainage groove; 212-2', second drainage groove; 212-3', third drainage groove; 213, plate fixing member; 213-1, compression bolt; 213-2, positioning pin; 214, positioning hole; 220, fixing device; 221, convex pressing plate; 222, boss; 223, drainage port; 224, pressing plate locking bolt;

[0041] 300, cooling water channel; 310, cooling water inlet and outlet. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in detail below with reference to the drawings, the components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application.

[0043] All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0044] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The technical solutions of the present application will be described clearly and completely in combination with Figs. 1-10. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0047] Referring to Figs. 1-3, the present application provides an extruder dehydration barrel, which comprises a barrel 100 and a dehydration mechanism 200,

[0048] The barrel 100 comprises a barrel wall 101, an extrusion cavity 110 formed by the barrel wall 101, and at least one dehydration port 120 formed on the outer side of the barrel wall 101 of the barrel 100;

[0049] The dehydration mechanism 200 comprises a dehydration screen 210 and a fixing device 220, wherein,

[0050] The dehydration screen 210 is arranged in the dehydration port 120 and is matched with the barrel wall 101 inside the dehydration port, and the fixing device 220 is used to fix the dehydration screen 120 in the dehydration port 120;

[0051] The dehydration screen 210 comprises at least two plates 211 and at least one drainage passage 212 formed between two adjacent plates 211.

[0052] The barrel 100 is a dehydration barrel of an extruder commonly used in the art, such as a dehydration barrel of a single-screw extruder or a double-screw extruder, etc. The barrel 100 extrudes plastic raw material powder through the middle extrusion cavity 110 to dehydrate.

[0053] The dehydration port 120 is formed on the side of the barrel 100, and the opening depth is adjusted according to the connection to the extrusion cavity 110, so that the moisture extruded from the extrusion cavity 110 is discharged through the drainage passage 212 in the dehydration port 120. The shape of the dehydration port 120 is not limited in the present application, which can be adjusted according to the requirement of discharging the moisture in the extrusion cavity 110.

[0054] The side of the dehydration screen 210 facing the extrusion cavity 110 should match the shape of the extrusion cavity 110 to prevent the dehydration screen 210 from occupying the extrusion space of the extrusion cavity 110.

[0055] The dehydration screen 210 comprises at least two plates 211 arranged in layers, which allows the filtration area to be increased or decreased by increasing or decreasing the number of plates 211, so as to adapt to the dehydration port 120 of different sizes, and also reduces the processing difficulty of the drainage passage 212.

[0056] The dehydration screen 210 can be adjusted by adjusting the number of plates 211 and the shape of the plates 211 to match the shape of the internal barrel wall 101 at the dehydration port 120, so as to prevent the plastic raw material powder in the extrusion cavity 110 from leaking and achieve the effect of discharging water.

[0057] One or more drainage channels 212 are formed between adjacent plates 211, and the size of the drainage channels 212 can be set according to the dewatered plastic raw material powder to adapt to different filtering requirements. By precisely controlling the gap and pore size between the screens, the dewatering screen 211 can effectively separate and discharge the moisture in the plastic raw material powder, thereby optimizing the dewatering efficiency, reducing the clogging of the material and the wear of the screen, and prolonging the service life of the equipment.

[0058] The fixing device 220 is fixed to the cylinder wall 101 on the outer side of the barrel 100, and provides pressure from the outside to the inside to fix the dewatering screen 210 in the dewatering port 120, while the dewatering screen 210 is higher than the extrusion cavity 110, so that the inside of the dewatering screen 210 is supported by the bottom of the dewatering port 120 opened by the barrel 100, realizing the fixation of the dewatering screen 210 in the dewatering port 120, and preventing the dewatering screen 210 from occupying the extrusion space of the extrusion cavity 110.

[0059] In one specific example of the present application, referring to FIGS. 1-3, the barrel 100 is a dewatering barrel of a double-screw extruder, the extrusion cavity 110 is in the shape of an "8", two dewatering ports 120 are opened on the cylinder wall 101 on the outer side of the barrel 100 and communicate with the extrusion cavity 110 and the outside space, and the side of the dewatering screen 210 facing the extrusion cavity 110 is semicircular, thereby matching the shape of the extrusion cavity 110, and the opening height of the dewatering port 120 and the height of the dewatering screen 210 are both greater than the cavity height of the extrusion cavity 110, so that under the condition of inward pressure of the external fixing device 220, the dewatering screen 210 can be supported by the inner cylinder wall 101 of the dewatering port 120, so that the dewatering screen 210 can accept the extruded moisture while not occupying the extrusion space of the extrusion cavity 110 and not interfering with the extrusion operation. The fixing device 220 is fixed to the cylinder wall 101 of the barrel 100 by bolts, so that the dewatering screen 210 is fixed in the dewatering port 120.

[0060] In some embodiments of the present application, the dewatering screen 210 includes a plate fixing member 213, and the dewatering screen 210 is provided with positioning holes 214 penetrating through the multiple plates 211, and the plate fixing member 213 fixes the filter screen plates 211 through the positioning holes 214.

[0061] Further, the plate fixing member 213 includes a pressing bolt 213-1 and a positioning pin 213-2, the positioning pin 213-2 is arranged in the positioning hole 214, and the pressing bolt 213-1 is inserted into the positioning hole 214 and cooperates with the positioning pin 213-2 to fix the multiple plates 213 into the dewatering screen 210.

[0062] The present application does not limit the shape, number and depth of the positioning hole 214, as long as the multiple plates 211 can be fixed to be relatively immobile by cooperating with the pressing bolt 213-1 and the positioning pin 213-2.

[0063] The positioning pin 213-2 is used in cooperation with the compression bolt 213-1 to fix the plurality of plates 211 in a stacked manner by being inserted into the positioning hole 214, thereby forming the structure of the dehydration screen 210. By arranging the positioning pin 213-2, the position of each plate 211 in the dehydration screen 210 can be ensured to be accurate, thereby ensuring the efficiency and effect of the screening process. In addition, the positioning pin 213-2 cooperates with the compression bolt 213-1 to provide firm fixation for the plate 211, thereby preventing displacement or vibration during the dehydration process.

[0064] In one specific example of the present application, referring to FIGS. 4-6, after the plurality of plates 211 are placed in a stacked manner, two through positioning holes 214 are formed, and in each positioning hole 214, the upper and lower screen plate compression bolts 213-1 are fixed relative to the positioning hole 214, and each screen plate compression bolt 213-1 is cooperated with a screen plate positioning pin 213-2 to fix the plurality of filter screen plates 211 in a stacked manner into the dehydration screen 210.

[0065] In some embodiments of the present application, the drainage channel 212 includes a first drainage gap 212-1, a second drainage gap 212-2, and a third drainage gap 212-3, and the plate 211 is provided with a drainage groove 212', which forms the drainage channel 212 with the bottom surface of another plate on the upper part of the plate 211. The drainage groove 212' includes a first drainage groove 212-1', a second drainage groove 212-2', and a third drainage groove 212-3', wherein the first drainage groove 212-1', the second drainage groove 212-2', and the third drainage groove 212-3' cooperate with the bottom surface of the upper plate 211 to form the first drainage gap 212-1, the second drainage gap 212-2, and the third drainage gap 212-3, respectively. The first drainage groove 212-1' is located on the side close to the extrusion cavity 110, and the depth of the first drainage groove 212-1' is less than that of the third drainage groove 212-3'. The bottom surface of the second drainage groove 212-2' is inclined to connect the first drainage groove 212-1' and the third drainage groove 212-3'.

[0066] The first drainage gap 212-1 is located on the side of the dehydration screen 210 close to the extrusion cavity 110, and the third drainage gap 212-3 is located on the side away from the extrusion cavity 110 and close to the external environment. The first drainage gap 212-1 gradually expands in the direction away from the extrusion cavity 110, passes through the second drainage gap 212-2, and reaches the third drainage gap 212-3.

[0067] Further, the dehydration screen 210 includes a plurality of first drainage gaps 212-1, and the lengths of the plurality of first drainage gaps 212-1 in the drainage direction are consistent.

[0068] In some embodiments of the present application, the dehydration screen 210 includes at least two parallel drainage channels 212.

[0069] The number and size of the drainage channels 212 are not limited in the present application, and can be determined according to the actual dewatering requirement. However, the widths of the drainage channels 212 are not the same, so that the drainage channels 212 are not blocked when the dewatering screen 210 is pressed at different positions.

[0070] The density of the drainage channels 212 is not limited in the present application, and the thickness of the plate 211 can be adjusted to adjust the density of the drainage channels 212.

[0071] The first drainage gap 212-1 expands outward to form the third drainage gap 212-3. The outside here refers to the outside of the extrusion cavity 110, i.e., from the inside to the outside of the barrel. The height of the first drainage gap 212-1 is less than the height of the third drainage gap 212-3, which not only prevents the material in the extrusion cavity 110 from leaking out of the first drainage gap 212-1, but also increases the channel area of the drainage, which helps to improve the drainage efficiency, ensures that the moisture can be smoothly drained from the dewatering screen 210, avoids the loss of material, and also helps to reduce the blockage of the equipment, thereby improving the operation efficiency and stability of the entire system.

[0072] The lengths of the first drainage gaps 212-1 of the plurality of drainage channels 212 included in the dewatering screen 210 are the same, thereby reducing the accumulation of material therein and avoiding the blockage of the drainage channels 212.

[0073] In one specific example of the present application, referring to FIGS. 6-8, FIG. 6 shows a plate 211 constituting the dewatering screen 210 in one embodiment of the present application. The plate 211 can form three drainage channels 212 with the bottom surface of another plate 211 above it. Each drainage channel 212 includes a first drainage groove 212-1', a second drainage groove 212-2', and a third drainage groove 212-3. FIG. 7 shows the drainage channels 212 formed after the plurality of plates 211 are stacked. FIG. 8 is an enlarged portion at Z in FIG. 7. As shown in FIGS. 6-8, three drainage channels 212 can be formed between the adjacent two plates 211. Each drainage channel 212 has a first drainage gap 212-1 near the side of the extrusion cavity 110, and then expands outward to a second drainage gap 212-2 and a third drainage gap 212-3.

[0074] In some embodiments of the present application, the fixing device 220 includes a convex pressing plate 221. A convex boss 222 capable of being inserted into the dewatering port 120 is formed in the middle of the convex pressing plate 221. A dewatering port 223 is formed in the middle of the convex boss 222. The drainage channels 212 are in communication with the external space through the dewatering port 223.

[0075] Further, the fixing device 220 further includes a pressing plate locking bolt 224. The convex pressing plate 221 is fixed to the barrel 100 through the pressing plate locking bolt 224.

[0076] The size of the convex pressing plate 221 should be able to fix the dehydration screen 210, which is not limited in the present application.

[0077] The drainage port 223 on the convex pressing plate 221 should be able to make all the drainage channels 212 communicate with the outside, and cannot be blocked.

[0078] The boss 222 can be inserted into the dehydration port 120, thereby directly contacting the dehydration screen 210 therein, so as to more firmly fix the dehydration screen 210.

[0079] The number of pressing plate locking bolts 224 should be able to firmly fix the convex pressing plate 221, which is not limited in the present application.

[0080] In one specific example of the present application, referring to FIGS. 2 and 3, each dehydration mechanism 200 on both sides of the barrel 100 includes two pressing plate locking bolts 224 on the upper and lower edges of each convex pressing plate 221, one pressing plate locking bolt 224 on the left and right edges of each convex pressing plate 221, and the boss 222 is shaped and sized to fit the dehydration port 120, thereby being able to be inserted into the dehydration port 120 and contacting the dehydration screen 210, so as to be able to give pressure to the dehydration screen 210 to fix it in the dehydration port 120.

[0081] In some embodiments of the present application, the opening direction of the dehydration port 120 is 0°-90° to the horizontal radial direction of the extrusion cavity 110.

[0082] Preferably, the opening direction of the dehydration port 120 is 0° or 90° to the horizontal radial direction of the extrusion cavity 110.

[0083] By adjusting the opening angle of the dehydration port 120, the water discharged in the extrusion cavity 110 can be more easily drained.

[0084] In one specific example of the present application, referring to FIG. 9, the opening direction of the two opposite dehydration ports 120 on the barrel 100 is an acute angle to the horizontal radial direction of the extrusion cavity 110, that is, the dehydration ports 120 are opened obliquely downward, so that the dehydration screen 210 and the drainage channel 212 are both in an obliquely downward state, which can make the water discharged in the extrusion cavity 110 more easily drain under the action of its own gravity, thereby enhancing the drainage effect.

[0085] In one specific example of the present application, referring to FIG. 10, the two opposite dehydration ports 120 on the barrel 100 are opened obliquely downward, and a third dehydration port 120 perpendicular to the horizontal radial direction of the extrusion cavity 110 is opened on the barrel at the bottom of the extrusion cavity 110, which also has the above-mentioned dehydration mechanism 200 therein, thereby further enhancing the drainage effect.

[0086] According to one aspect of the present application, the cooling water channel 300 is arranged in the barrel 100, and is arranged close to the extrusion cavity 110.

[0087] In one specific example of the present application, referring to Figs. 1-3, the cooling water channel 300 is arranged in the upper and lower portions of the extrusion cavity 110 inside the dehydration barrel 100, and is not in direct contact with the extrusion cavity 110, but is arranged close to the inner wall of the extrusion cavity 110, so as to ensure that the extrusion heat in the barrel 100 is promptly taken away by the cooling water, and the material temperature is maintained stable. The barrel 100 is provided with a cooling water inlet and outlet 310 to realize the flow of the cooling water, and to enhance the heat dissipation effect of the equipment.

[0088] It should be noted that the technical solutions in each embodiment of the present application can be combined with each other, but the basis for the combination is that it can be realized by a person of ordinary skill in the art; when the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, i.e. it is not within the protection scope of the present application.

[0089] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An extruder dehydrating barrel characterized by, The utility model relates to a dehydration device for extruder, comprising: a barrel and a dehydration mechanism, the barrel comprises a barrel wall, an extrusion cavity enclosed by the barrel wall, and at least one dehydration port formed in the barrel wall; the dehydration mechanism comprises a dehydration screen and a fixing device, the dehydration screen is arranged in the dehydration port and is matched with the barrel wall, and the fixing device is used for fixing the dehydration screen in the dehydration port; the dehydration screen comprises at least two plates and at least one drainage channel formed between two adjacent plates.

2. The dewatering barrel of claim 1, wherein, The at least two plates are fixedly connected to each other.

3. The dewatering barrel of claim 2, wherein, The dehydration screen comprises a plate fixing member, the plate is provided with a positioning hole, and the plate fixing member is used for fixedly connecting the at least two plates through the positioning hole.

4. The dewatering barrel of claim 3, wherein, The plate fixing member comprises a pressing bolt and a positioning pin, the positioning pin is arranged in the positioning hole, the pressing bolt is inserted into the positioning hole and cooperates with the positioning pin to fixedly connect the at least two plates.

5. The dewatering barrel of claim 1, wherein, The drainage channel comprises a first drainage gap, a second drainage gap and a third drainage gap, the first drainage gap is located on the side of the dehydration screen close to the extrusion cavity, the first drainage gap gradually expands outward to form the second drainage gap, and finally expands to form the third drainage gap.

6. The dewatering barrel of claim 5, wherein, The plate surface is provided with a drainage groove, and the adjacent plate covers the drainage groove to form the drainage channel. The drainage groove comprises a first drainage groove, a second drainage groove and a third drainage groove, the first drainage groove is located on the side close to the extrusion cavity, the depth of the first drainage groove is smaller than that of the third drainage groove, and the bottom surface of the second drainage groove is inclined to connect the first drainage groove and the third drainage groove.

7. The dewatering barrel of claim 5, wherein, The lengths of the at least two first drainage gaps in the drainage direction are consistent.

8. The dewatering barrel of claim 1, wherein, The dehydration screen comprises at least two parallel drainage channels.

9. The dewatering barrel of claim 1, wherein, The fixing device comprises a convex pressing plate, a convex boss capable of being inserted into the dehydration port is formed in the middle of the convex pressing plate, a drainage port is formed in the middle of the convex boss, and the drainage channel communicates with the outside space through the drainage port.

10. The dewatering barrel of claim 8, wherein, The fixing device further comprises a pressing plate locking bolt, and the convex pressing plate is fixed on the barrel wall through the pressing plate locking bolt.

11. The dewatering barrel of claim 1, wherein, The dehydration port is arranged in the direction of 0°-90° with respect to the horizontal radial direction of the extrusion cavity.

12. The dewatering barrel of claim 11, wherein, The dehydration port is arranged in the direction of 0° or 90° with respect to the horizontal radial direction of the extrusion cavity.

13. The dewatering barrel of claim 1, wherein, The barrel is provided with a cooling water channel, and the cooling water channel is arranged close to the extrusion cavity.

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