Dehydrating cylinder of extruder

Abstract

The utility model relates to the technical field of plastic raw material powder extrusion dewatering, in particular to an extruder dewatering machine barrel which comprises a machine barrel and a dewatering mechanism, the machine barrel comprises a barrel wall and an extrusion cavity defined by the barrel wall, and at least one dewatering opening is formed in the barrel wall; the dewatering mechanism comprises a dewatering screen and a fixing device, the dewatering screen is arranged in the dewatering opening and matched with the barrel wall, and the fixing device is used for fixing the dewatering screen in the dewatering opening; the dewatering screen comprises at least two plates, and at least one drainage channel is formed between every two adjacent plates. The dewatering machine barrel can effectively discharge separated water in the extruder, and the dewatering screen of the combined structure further reduces the machining difficulty of a drainage channel. The drainage channels are different in height, and when the dewatering screen is extruded, the drainage channels can not be pressed and blocked. The drainage gaps of the drainage channels are consistent in length, and accumulation of materials in the drainage gaps is avoided. The angle of the dewatering screen can be set according to needs, and the dewatering effect is further enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic raw material powder extrusion dehydration, and particularly 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 manufacturing of plastic particles after dehydration is the basis for manufacturing various plastic products. However, the newly produced plastic powder often contains a high moisture content, which can 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 the plastic particles are manufactured.

[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 forcibly remove the water. However, in order to improve the dehydration efficiency, on the one hand, multiple auxiliary equipment need to be used, 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 requires higher production space. CONTENT OF THE INVENTION

[0004] 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,

[0005] The barrel comprises a barrel wall and an extrusion cavity formed by the barrel wall, and the barrel wall is provided with at least one dehydration port;

[0006] The dehydration mechanism comprises a dehydration screen and a fixing device, wherein,

[0007] 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;

[0008] The dehydration screen comprises at least two plates and at least one drainage channel formed between two adjacent plates.

[0009] According to one aspect of the present application, the at least two plates are fixedly connected to each other.

[0010] 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.

[0011] According to one 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, the pressing bolt is inserted into the positioning hole and cooperates with the positioning pin to fixedly connect the at least two plates.

[0012] 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 to form the second drainage gap, and finally expands to form the third drainage gap.

[0013] 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.

[0014] 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 less 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.

[0015] According to an aspect of the present application, the length of the first drainage gap in the drainage direction is consistent.

[0016] According to an aspect of the present application, the dewatering screen comprises at least two parallel drainage channels.

[0017] 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 formed in the middle of the convex boss, and the drainage channel is communicated with the external space through the dewatering port.

[0018] 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 cylinder wall through the pressing plate locking bolt.

[0019] 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.

[0020] 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.

[0021] According to an aspect of the present application, a cooling water channel is arranged in the cylinder, and the cooling water channel is arranged close to the extrusion cavity.

[0022] One or more embodiments of the present application have at least the following beneficial effects:

[0023] 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 needed, which further enhances the dehydration effect.

[0024] The application sets high-density cooling water channels near the extrusion cavity in the barrel, thereby ensuring that the extrusion heat in the barrel is promptly taken away by the cooling water, maintaining the stability of the material temperature.

[0025] The application not only improves the dehydration efficiency, but also ensures the performance stability of the raw materials during the processing process, which helps to reduce the production cost and improve the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] 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:

[0027] Figure 1 is a schematic diagram of the overall structure of the dehydration barrel of the extruder according to the embodiment of the application;

[0028] Figure 2 is a schematic diagram of the barrel structure of the dehydration barrel of the extruder according to the embodiment of the application;

[0029] Figure 3 is Figure 1 A-A sectional view of;

[0030] Figure 4 is a schematic diagram of the dehydration screen structure of the dehydration barrel of the extruder according to the embodiment of the application;

[0031] Figure 5 is Figure 4 B-B sectional view of;

[0032] Figure 6 is a schematic diagram of the structure of the plate provided with drainage channels according to the embodiment of the application;

[0033] Figure 7 is Figure 4 C-C sectional view of;

[0034] Figure 8 is Figure 7 Z in enlarged view;

[0035] Figure 9is a sectional view of an extruder dehydration barrel provided according to another embodiment of the present application;

[0036] Figure 10 is an exploded view of an extruder dehydration barrel structure provided according to yet another embodiment of the present application.

[0037] Reference signs:

[0038] 100, barrel; 101, barrel wall; 110, extrusion cavity; 120, dehydration port;

[0039] 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;

[0040] 300, cooling water channel; 310, cooling water inlet and outlet. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described in detail below with reference to the drawings, which show by way of illustration the embodiments of the present application described and shown herein can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0042] All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element 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.

[0044] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The technical solutions of the present application will be described below in combination with Figures 1 to 10 The technical solutions of the present application will be described below in combination with

[0046] Referring to Figures 1-3 The present application provides an extruder dehydration barrel, comprising: a barrel 100 and a dehydration mechanism 200,

[0047] 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;

[0048] The dehydration mechanism 200 comprises a dehydration screen 210 and a fixing device 220, wherein,

[0049] 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;

[0050] The dehydration screen 210 comprises at least two plates 211 and at least one drainage passage 212 formed between adjacent two plates 211.

[0051] The barrel 100 is a dehydration barrel commonly used in the art of extruder, such as the dehydration barrel of single-screw extruder or double-screw extruder, etc. The barrel 100 extrudes the plastic raw material powder through the middle extrusion cavity 110 to make it dehydrate.

[0052] The dehydration port 120 is formed on the side of the barrel 100, and the opening depth is connected to the extrusion cavity 110, so that the moisture extruded by 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 realize the discharge of moisture in the extrusion cavity 110.

[0053] 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.

[0054] The dehydration screen 210 includes at least two layers of stacked plates 211, which allows the filtration area to be increased or decreased by increasing or decreasing the number of plates 211 to adapt to different sizes of dehydration openings 120, while reducing the processing difficulty of the drainage channels 212.

[0055] 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 cylinder wall 101 at the dehydration opening 120 to prevent the plastic raw material powder in the extrusion cavity 110 from leaking out and to allow drainage.

[0056] 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 dehydration of the plastic raw material powder to adapt to different filtration needs. By precisely controlling the gap and pore size between the screen plates, the dehydration screen 211 can effectively separate and drain the moisture in the plastic raw material powder, thereby optimizing the dehydration efficiency, reducing material blockage and screen plate wear, and prolonging the service life of the equipment.

[0057] The fixing device 220 is fixed to the cylinder wall 101 on the outer side of the barrel 100, providing pressure from the outside to the inside to fix the dehydration screen 210 in the dehydration opening 120, while the dehydration screen 210 is higher than the extrusion cavity 110, so that the dehydration screen 210 is internally supported by the bottom of the dehydration opening 120 formed by the barrel 100, achieving the fixation of the dehydration screen 210 in the dehydration opening 120, preventing the dehydration screen 210 from occupying the extrusion space of the extrusion cavity 110.

[0058] In one specific example of the present application, referring to Figures 1-3 The barrel 100 is a dehydration barrel of a double-screw extruder, the extrusion cavity 110 is formed in the shape of an "8", two dehydration openings 120 are formed on the outer cylinder wall 101 of the barrel 100 and communicate with the extrusion cavity 110 and the external space, and the side of the dehydration screen 210 facing the extrusion cavity 110 is semicircular in shape, thereby matching the shape of the extrusion cavity 110, and the height of the dehydration opening 120 and the height of the dehydration screen 210 are both greater than the cavity height of the extrusion cavity 110, so that under the condition of being pressed inward by the external fixing device 220, the dehydration screen 210 can be supported by the internal cylinder wall 101 of the dehydration opening 120, allowing the dehydration screen 210 to 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 to fix the dehydration screen 210 in the dehydration opening 120.

[0059] In some embodiments of the present application, the dehydration screen 210 includes a plate fixing member 213, and the dehydration screen 210 is provided with positioning holes 214 that penetrate through multiple plates 211, and the plate fixing member 213 fixes the filter screen plates 211 through the positioning holes 214.

[0060] 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 plurality of plates 213 stacked into the dehydration screen 210.

[0061] The shape, number and depth of the positioning hole 214 are not limited in the present application, as long as the plurality of plates 211 can be fixed to be relatively stationary by cooperating with the pressing bolt 213-1 and the positioning pin 213-2.

[0062] The positioning pin 213-2 is used in cooperation with the pressing bolt 213-1 to fix the plurality of plates 211 stacked in the form of the dehydration screen 210 by being inserted into the positioning hole 214. 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 pressing bolt 213-1 to provide firm fixation for the plate 211, preventing displacement or vibration during the dehydration process.

[0063] In one specific example of the present application, referring to Figures 4-6 After the plurality of plates 211 are stacked, two through positioning holes 214 are opened, and in each positioning hole 214, the upper and lower screen plate pressing bolts 213-1 are relatively fixed in the positioning hole 214, and each screen plate pressing bolt 213-1 is cooperated with a screen plate positioning pin 213-2 to fix the plurality of filter screen plates 211 stacked into the dehydration screen 210.

[0064] 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 a drainage groove 212' is opened on the plate 211, 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 bottom surface of the upper plate 211 cooperate 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'.

[0065] The first drainage gap 212-1 is located on the side of the dewatering screen 210 close to the extrusion cavity 110, and the third drainage gap 212-3 is located on the side far 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.

[0066] Further, the dewatering 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.

[0067] In some embodiments of the present application, the dewatering screen 210 includes at least two parallel drainage channels 212.

[0068] The present application does not limit the number and size of the drainage channels 212, and the actual dewatering needs are used as the criterion. However, the channel widths of some of the drainage channels 212 are not the same, which can ensure that the drainage channels 212 are not compressed and blocked when the dewatering screen 210 at different positions is subjected to extrusion pressure.

[0069] The present application does not limit the density of the drainage channels 212, that is, different thicknesses of the plates 211 can be used to adjust the density of the drainage channels 212.

[0070] The first drainage gap 212-1 expands outward to form the third drainage gap 212-3, and the external environment here is the external environment relative to the extrusion cavity 110, that is, 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 problem of the equipment, thereby improving the operation efficiency and stability of the entire system.

[0071] The first drainage gaps 212-1 of the plurality of drainage channels 212 included in the dewatering screen 210 have the same length, thereby reducing the accumulation of material therein and avoiding the blockage of the drainage channels 212.

[0072] In a specific example of the present application, referring to Figures 6-8 , Figure 6 The plate 211 constituting the dewatering screen 210 in an embodiment of the present application is shown, and 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. Figure 7 The drainage channels 212 formed after the stacking of a plurality of plates 211 are shown, Figure 8 isFigure 7 The enlarged portion at Z, in combination Figures 6-8 As can be seen, three drainage channels 212 can be formed between two adjacent plates 211, each drainage channel 212 has a first drainage gap 212-1 near one side of the extrusion cavity 110, and then expands outwardly to a second gradually expanding drainage gap 212-2 and a third drainage gap 212-3.

[0073] In some embodiments of the present application, the fixing device 220 comprises 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 drainage port 223 is formed in the middle of the convex boss 222, and the drainage channel 212 communicates with the outside space through the drainage port 223.

[0074] Further, the fixing device 220 further comprises a pressing plate locking bolt 224, and the convex pressing plate 221 is fixed to the barrel 100 through the pressing plate locking bolt 224.

[0075] The size of the convex pressing plate 221 should be able to fix the dewatering screen 210, which is not limited in the present application.

[0076] The drainage port 223 formed on the convex pressing plate 221 should be able to communicate all the drainage channels 212 with the outside, and cannot be blocked.

[0077] The convex boss 222 can be inserted into the dewatering port 120, thereby directly contacting the dewatering screen 210 therein, so as to more firmly fix the dewatering screen 210.

[0078] The number of the pressing plate locking bolts 224 should be able to firmly fix the convex pressing plate 221, which is not limited in the present application.

[0079] In a specific example of the present application, referring to Figure 2 and Figure 3 Each of the two dewatering mechanisms 200 on both sides of the barrel comprises 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 each of the left and right edges of the convex pressing plate 221, and the convex boss 222 is just the same size as the dewatering port 120, thereby being able to be inserted into the dewatering port 120 and contacting the dewatering screen 210, so as to be able to give pressure to the dewatering screen 210 to fix it in the dewatering port 120.

[0080] In some embodiments of the present application, the dewatering port 120 is formed in a direction of 0°-90° with respect to the horizontal radial direction of the extrusion cavity 110.

[0081] Preferably, the dewatering port 120 is formed in a direction of 0° or 90° with respect to the horizontal radial direction of the extrusion cavity 110.

[0082] By adjusting the opening angle of the dewatering port 120, the water in the extrusion cavity 110 is more easily discharged.

[0083] In one specific example of the present application, referring to Figure 9 , the two opposite dewatering ports 120 on the barrel 100 are opened at an acute angle with the horizontal radial direction of the extrusion cavity 110, that is, the dewatering ports 120 are opened obliquely downward, so that the dewatering screen 210 and the drainage channel 212 are both in an obliquely downward state, which can make the water in the extrusion cavity 110 more easily discharged under the action of its own gravity, enhancing the drainage effect.

[0084] In one specific example of the present application, referring to Figure 10 , the two opposite dewatering ports 120 on the barrel 100 are opened obliquely downward, and a third dewatering 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 dewatering mechanism 200, further enhancing the drainage effect.

[0085] According to one aspect of the present application, a cooling water channel 300 is arranged in the barrel 100, which is arranged close to the extrusion cavity 110.

[0086] In one specific example of the present application, referring to Figures 1-3 , the cooling water channel 300 is arranged in the upper and lower parts of the extrusion cavity 110 inside the dewatering barrel 100, not in direct contact with the extrusion cavity 110, but 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, maintaining the stability of the material temperature. The barrel 100 is provided with a cooling water inlet and outlet 310 to realize the flow of cooling water and enhance the heat dissipation effect of the equipment.

[0087] 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 mutual combination is that it can be realized by ordinary skilled personnel in the art; when the combination of technical solutions appears contradictory or unachievable, 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.

[0088] 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 skilled 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 dewatering barrel, characterized in that, include: barrel and dewatering mechanism, The barrel includes a barrel wall and a compression cavity formed by the barrel wall, and the barrel wall has at least one dewatering port; The dewatering mechanism includes a dewatering screen and a fixing device, wherein... The dewatering screen is disposed in the dewatering inlet and is adapted to the cylinder wall; the fixing device is used to fix the dewatering screen in the dewatering inlet. The dewatering screen includes at least two plates, and at least one drainage channel is formed between two adjacent plates; The drainage channel includes 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 near the extrusion chamber. The first drainage gap gradually expands outward to form the second drainage gap, and finally expands to form the third drainage gap. The surface of the plate is provided with drainage grooves, and the adjacent plates of the plate cover the drainage grooves to form the drainage channel; The drainage channel includes a first drainage channel, a second drainage channel, and a third drainage channel. The first drainage channel is located near the extrusion chamber and its depth is less than that of the third drainage channel. The bottom surface of the second drainage channel is inclined to connect the first drainage channel and the third drainage channel.

2. The dewatering drum according to claim 1, characterized in that, At least two of the aforementioned plates are stacked and fixedly connected to each other.

3. The dewatering drum according to claim 2, characterized in that, The dewatering screen includes a plate fixing member, on which positioning holes are provided, and the plate fixing member fixes at least two plates through the positioning holes.

4. The dewatering drum according to claim 3, characterized in that, The plate fixing component includes a clamping bolt and a positioning pin. The positioning pin is disposed in the positioning hole, and the clamping bolt is inserted into the positioning hole and cooperates with the positioning pin to fix at least two plates.

5. The dewatering drum according to claim 1, characterized in that, At least two of the first drainage gaps have the same length along the drainage direction.

6. The dewatering drum according to claim 1, characterized in that, The dewatering screen includes at least two parallel drainage channels.

7. The dewatering drum according to claim 1, characterized in that, The fixing device includes a convex pressure plate, the convex pressure plate has a boss in the middle that can be inserted into the dewatering port, the boss has a drain outlet in the middle, and the drain channel communicates with the external space through the drain outlet.

8. The dewatering drum according to claim 7, characterized in that, The fixing device also includes a pressure plate locking bolt, and the convex pressure plate is fixed to the cylinder wall by the pressure plate locking bolt.

9. The dewatering drum according to claim 1, characterized in that, The opening direction of the dewatering port is 0°~90° with the horizontal radial direction of the extrusion chamber.

10. The dewatering drum according to claim 9, characterized in that, The dehydration port is opened at a direction of 0° or 90° to the horizontal radial direction of the extrusion chamber.

11. The dewatering drum according to claim 1, characterized in that, The barrel is provided with cooling water channels, which are located close to the extrusion chamber.

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