Double-screw extruder devolatilization treatment structure

Abstract

The utility model discloses a devolatilization processing structure of a double-screw extruder, which belongs to the technical field of devolatilization of double-screw extruders and comprises a pipe body, the pipe body is mounted at a discharge port of the double-screw extruder, and a sealing cover is mounted at the upper end of the pipe body; the vacuum pipeline is communicated with the pipe body; the blocking assembly is installed in the pipe body, a filtering part is installed in the blocking assembly, and the filtering part at least has two states; when the polymer is located outside the blocking assembly, the filtering part is in a first state, and at the moment, a gap is reserved between the filtering part and the blocking assembly for exhausting devolatilization gas; when the polymer moves to the interior of the blocking assembly to be in contact with the filtering part, the filtering part is in a second state, and at the moment, the filtering part is tightly attached to the blocking assembly to filter the polymer. Through the arrangement of the cover body and the filtering cover, frequent vacuum material returning and product foaming caused by the fact that the polymer easily enters a devolatilization channel can be avoided; and the devolatilization effect of the material is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of twin-screw extruder devolatilization, in particular to a twin-screw extruder devolatilization processing structure. Background Art

[0002] Devolatilization is a mass transfer operation. The molecules of volatile components in the polymer melt matrix must diffuse to the liquid-gas interface and then be discharged and collected. As the volatile content further decreases, a very concentrated polymer solution is formed, and the viscosity increases to a level that requires rotating equipment to pump the solution forward, allowing the surface to renew and facilitate the capture of vapor bubbles, as well as improve mass transfer and heat transfer. Therefore, it is usually necessary to use equipment with rotating elements to perform devolatilization operations, such as a co-rotating twin-screw extruder, combined with a high vacuum generation device to expose the molten polymer to a lower absolute pressure level, causing the polymer-volatile mixture system to overheat, thereby removing volatiles. However, during the devolatilization process, as the polymer solution gradually becomes more concentrated, its viscosity also increases, which can easily cause the polymer solution to enter the devolatilization channel, resulting in frequent vacuum refills, product foaming, and poor material devolatilization effect. To address the above problems, the utility model provides a twin-screw extruder devolatilization processing structure. Utility Model Content

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a twin-screw extruder devolatilization processing structure. Through the arrangement of the cover body and the filter cover, it can prevent the polymer from easily entering the devolatilization channel, causing problems such as frequent vacuum return, product foaming, and poor material devolatilization effect.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a twin-screw extruder devolatilization treatment structure, comprising:

[0005] A tube body, the tube body being installed at the discharge port of the twin-screw extruder, the upper end of the tube body being provided with an inspection port, and a sealing cover being installed inside the inspection port;

[0006] A vacuum pipe is fixedly connected to the outer wall of the pipe body and communicates with the pipe body, and is connected to an external negative pressure vacuum device;

[0007] An intercepting assembly is installed inside the pipe body, and a filter is installed inside the intercepting assembly, and the filter has at least two states;

[0008] When the polymer is located outside the barrier assembly, the filter portion is in a first state, where a gap is left between the filter portion and the barrier assembly for the devolatilization gas to be discharged;

[0009] When the polymer moves to the inside of the blocking component and contacts the filter portion, the filter portion is in a second state, in which the filter portion is tightly fitted to the blocking component to filter the polymer.

[0010] Preferably, the blocking assembly includes a cover body, the shape of the cover body is a trumpet-shaped body that is thicker at the bottom and thinner at the top, and a mounting pipe is fixedly connected to the upper opening of the cover body, and the filter part and the mounting pipe are connected to each other.

[0011] Preferably, the cover body is installed obliquely inside the tube body, and the lowest point of the upper side of the cover body is located at the position where the vacuum pipe is connected to the tube body.

[0012] Preferably, the sealing cover is in the shape of an arch with a center convex upward.

[0013] Preferably, the filter portion includes a filter cover, which is in a hemispherical shape with a concave center, and the diameter of the upper opening of the filter cover is larger than the diameter of the upper opening of the cover body.

[0014] Preferably, a vertical rod is fixedly connected to the filter cover, the upper end of the vertical rod passes through the fixed rod, extends to the outside of the fixed rod and is folded around to form a convex circle, and a spring is connected between the folded end of the vertical rod and the fixed rod, and the spring has a tendency to pull the vertical rod downward, and the fixed rod is fixedly connected to the inside of the mounting tube.

[0015] The beneficial effects of the present invention are:

[0016] The utility model realizes, through the arrangement of the cover body, the filter cover and the spring, that when the polymer is not in contact with the filter cover, there is a gap between the filter cover and the inner wall of the cover body, so that the volatile gas can be discharged more quickly and smoothly. When the polymer is in contact with the filter cover, the filter cover will fit together with the lower side of the cover body, which can block the polymer, and the volatile gas will pass through the filter cover and be discharged, thereby preventing the polymer from entering the space above the cover body and affecting production work.

[0017] The cover body of the utility model is installed obliquely inside the tube body, and the sealing cover is set to an arch shape with a central upward convexity. After the volatiles enter the space above the cover body, the volatiles falling on the upper side of the cover body can enter the interior of the vacuum pipe along the upper side of the cover body, and the sealing cover can guide the volatiles, so that the volatiles move along the inner side wall of the pipe to the upper side of the cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 The present invention provides a schematic structural diagram of a twin-screw extruder devolatilization treatment structure.

[0020] Figure 2 This is a cross-sectional view of the present invention (first perspective).

[0021] Figure 3 For this utility model Figure 2 Enlarged view of point A.

[0022] Figure 4 This is a cross-sectional view of the present invention (second perspective).

[0023] Description of reference numerals:

[0024] 1. Tube body, 2. Vacuum pipe, 3. Cover body, 4. Mounting tube, 5. Sealing cover, 6. Filter cover, 7. Vertical rod, 8. Fixing rod, 9. Spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The utility model provides a twin-screw extruder devolatilization processing structure, such as Figures 1 to 4 shown.

[0027] Example 1:

[0028] A twin-screw extruder devolatilization treatment structure includes a tube body 1, which is installed at the discharge port of the twin-screw extruder. An inspection port is provided at the upper end of the tube body 1. The setting of the inspection port can facilitate maintenance work for staff. A sealing cover 5 is installed inside the inspection port. The sealing cover 5 is connected to the tube body 1 through a flange. A vacuum pipe 2 is fixedly connected to one side of the tube body 1. The vacuum pipe 2 is communicated with the tube body 1 and is also connected to external negative pressure vacuum equipment.

[0029] The tube body 1 is fixedly provided with a blocking assembly, and the blocking assembly is provided with a filter portion, which has at least the following two states:

[0030] When the polymer is outside the barrier component, the polymer does not contact the filter part. At this time, there is a gap between the filter part and the inner wall of the barrier component, which allows the volatiles to better pass through the barrier component and enter the interior of the vacuum pipe 2 to complete the devolatilization process.

[0031] When the polymer enters the barrier component and contacts the filter part, the polymer will press the filter part downward, so that the filter part fits tightly against the inner wall of the barrier component. At this time, the filter part can block the polymer, but the volatile substances in the polymer will pass through the filter part into the space above the barrier component and finally be discharged through the vacuum pipe.

[0032] Example 2:

[0033] On the basis of Example 1, the blocking component adopts the following structure, which includes a cover body 3. The cover body 3 is in the shape of a trumpet that is thick at the bottom and thin at the top. The cover body 3 is installed obliquely inside the tube body 1, and the lowest point of the upper side of the cover body 3 is located at the position where the vacuum pipe 2 is connected to the tube body 1. After the volatiles enter the cover body 3, if they are not discharged through the vacuum pipe 2 in time, they will fall to the upper side of the cover body 3 under the action of their own gravity, and then enter the interior of the vacuum pipe 2 along the upper side of the cover body 3 and be discharged.

[0034] Furthermore, in order to prevent volatiles that enter the top of the cover body 3 from re-entering the bottom of the cover body 3, a mounting tube 4 is fixedly connected to the upper opening of the cover body 3. The height of the upper end of the mounting tube 4 is higher than the height of the highest point of the upper side of the cover body 3, which can prevent volatiles on the upper side of the cover body 3 from entering the interior of the mounting tube 4, and the shape of the sealing cover 5 is set to be an arch with a convex center. The arch shape of the sealing cover 5 can guide the volatiles, so that the volatiles move along the side wall of the tube body 1 to the upper side of the cover body 3, and then are discharged through the vacuum pipe 2.

[0035] Example 3:

[0036] Based on the second embodiment, the filter unit can be installed in the following manner, specifically as follows:

[0037] The filter part includes a filter cover 6, which is in the shape of a hemispherical shape with a concave center, and the diameter of the upper opening of the filter cover 6 is larger than the diameter of the upper opening of the cover body 3. A vertical rod 7 is fixedly connected to the filter cover 6. The upper end of the vertical rod 7 passes through the fixed rod 8 and extends to the outside of the fixed rod 8 and folds around to form a convex circle. A spring 9 is connected between the folded end of the vertical rod 7 and the fixed rod 8. The spring 9 has a tendency to pull the vertical rod 7 downward, and the fixed rod 8 is fixedly connected to the inside of the mounting tube 4.

[0038] Under the action of the spring 9, a gap is left between the upper end opening of the filter cover 6 and the lower side of the cover body 3. At the same time, because the shape of the filter cover 6 can play a certain guiding role for the volatiles, and the volatiles can also pass through the filter cover 6, the volatiles can quickly pass through the cover body 3 and the mounting tube 4 and be discharged through the vacuum pipe 2.

[0039] When the polymer contacts the filter cover 6, the polymer will push the filter cover 6 upward, so that the filter cover 6 overcomes the elastic force of the spring 9 and presses against the lower side of the cover body 3, and fits with the lower side of the cover body 3. At this time, the filter cover 6 will block the polymer, and the volatile matter can pass through the filter cover 6, thereby effectively preventing the polymer from entering the interior of the vacuum pipe 2.

[0040] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A twin-screw extruder devolatilization treatment structure, characterized in that: include: A tube body (1), the tube body (1) being installed at the discharge port of the twin-screw extruder, the upper end of the tube body (1) being provided with an inspection port, and a sealing cover (5) being installed inside the inspection port; A vacuum pipe (2), the vacuum pipe (2) is fixedly connected to the outer wall of the pipe body (1) and communicates with the pipe body (1), and the vacuum pipe (2) is connected to external negative pressure vacuum equipment; A blocking component, the blocking component is installed inside the pipe body (1), and a filter portion is installed inside the blocking component, and the filter portion has at least two states; When the polymer is located outside the barrier assembly, the filter portion is in a first state, where a gap is left between the filter portion and the barrier assembly for the devolatilization gas to be discharged; When the polymer moves to the inside of the blocking component and contacts the filter portion, the filter portion is in a second state, in which the filter portion is tightly fitted to the blocking component to filter the polymer.

2. A twin-screw extruder devolatilization processing structure according to claim 1, characterized in that: The blocking assembly comprises a cover body (3), the cover body (3) is in the shape of a trumpet that is thick at the bottom and thin at the top, and a mounting pipe (4) is fixedly connected to the upper opening of the cover body (3), and the filter portion and the mounting pipe (4) are connected to each other.

3. A twin-screw extruder devolatilization processing structure according to claim 2, characterized in that: The cover body (3) is installed obliquely inside the tube body (1), and the lowest point of the upper side of the cover body (3) is located at the position where the vacuum pipe (2) is connected to the tube body (1).

4. A twin-screw extruder devolatilization processing structure according to claim 3, characterized in that: The sealing cover (5) is in the shape of an arch with a central upward convexity.

5. A twin-screw extruder devolatilization processing structure according to claim 2, characterized in that: The filter portion comprises a filter cover (6), the filter cover (6) is in a hemispherical shape with a concave center, and the diameter of the upper opening of the filter cover (6) is larger than the diameter of the upper opening of the cover body (3).

6. A twin-screw extruder devolatilization processing structure according to claim 5, characterized in that: A vertical rod (7) is fixedly connected to the filter cover (6), and the upper end of the vertical rod (7) passes through the fixing rod (8), extends to the outside of the fixing rod (8) and is folded around to form a convex circle. A spring (9) is connected between the folded end of the vertical rod (7) and the fixing rod (8), and the spring (9) has a tendency to pull the vertical rod (7) downward. The fixing rod (8) is fixedly connected to the inside of the mounting tube (4).

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