Internal and external cooling circulation mechanism of double-screw extruder

Abstract

The utility model relates to the technical field of double-screw extruders, and discloses an internal and external cooling circulation mechanism of a double-screw extruder, which comprises the double-screw extruder, an extrusion pipe fixedly mounted at the output end of the double-screw extruder, a cooling water circulation machine mounted on the double-screw extruder, a first cooling part fixedly mounted on the outer wall surface of the extrusion pipe, and a second cooling part fixedly mounted on the outer wall surface of the cooling water circulation machine, the first cooling part is of a continuous spiral structure and has the same screw pitch, a containing space is formed by a gap between the extrusion pipe and the adjacent turns of the first cooling part, a second cooling part is movably installed in the containing space, and the second cooling part is of a threaded structure complementary to the first cooling part. According to the cooling device, when materials need to be slowly cooled for a long time, the second cooling part is rotated, part of the second cooling part is screwed out of the containing space, at the moment, the second cooling part forms an extension cooling part at the output end of the extrusion pipe, and the materials enter the extension cooling part after passing through the extrusion pipe; and cooling continues to be conducted through the screwed-out second cooling part, and the production requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of twin-screw extruders, in particular to an internal and external cooling circulation mechanism of a twin-screw extruder. Background Art

[0002] The twin-screw extruder is composed of several parts, such as a transmission device, a feeding device, a barrel and a screw. The functions of each component are similar to those of a single-screw extruder. The twin-screw extruder is developed on the basis of the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability and other characteristics, it has been widely used in the molding of extruded products. When the twin-screw extruder is working, the material must first be heated to melt it, and then the next step of extrusion is carried out through the twin screws. Before extrusion, preliminary barrel cooling is required, and the speed of the screw determines the extrusion speed of the extruder. When increasing the extrusion speed, the cooling speed needs to be increased at the same time to avoid the extruded material being scrapped without being formed.

[0003] After searching, Chinese patent publication number CN114474673B discloses a barrel cooling device for a twin-screw extruder, including a coaxially arranged cooling outer barrel and a cooling inner barrel, the gap between the two forming an extrusion channel; the barrel walls of the cooling outer barrel and the cooling inner barrel are both provided with a circulation pipeline for the flow of cooling medium; the cooling outer barrel includes a fixed part and an extension part, the extension part is slidably mounted on the fixed part, and is connected to a control unit fixedly arranged on the frame, and the control unit adjusts the extension amount of the extension part according to the rotation speed of the twin-screw extruder. The present invention uses an inner and outer two-layer cooling barrel to cool the inner and outer sides of the material simultaneously.

[0004] In this inner and outer sleeve cooling method, when rapid cooling is required, the outer cooling sleeve can only cool the material indirectly, and after the outer cooling sleeve slides out, the distance to the material is not close enough, and the cooling efficiency is not high.

[0005] Therefore, we propose an internal and external cooling circulation mechanism for a twin-screw extruder. Utility Model Content

[0006] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides an internal and external cooling circulation mechanism for a twin-screw extruder.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an internal and external cooling circulation mechanism of a twin-screw extruder, comprising a twin-screw extruder, an extrusion tube fixedly installed at the output end of the twin-screw extruder, a cooling water circulation machine also installed on the twin-screw extruder, a first cooling part fixedly installed on the outer wall of the extrusion tube, the first cooling part is a continuous spiral structure with the same pitch, the gap between adjacent turns of the extrusion tube and the first cooling part forms a storage space, a second cooling part is movably installed in the storage space, the second cooling part is a threaded structure complementary to the first cooling part, the first cooling part and the second cooling part are hollow inside to form an internal cooling pipe, and the internal cooling pipe is connected to the output end of the cooling water circulation machine through a pipe.

[0008] Preferably, a motor is fixedly mounted on the twin-screw extruder, a driving gear is fixedly mounted on the output end of the motor, a driven gear ring is fixedly mounted on the outer wall of the second cooling part, and the driven gear ring is spirally distributed along the outer wall of the second cooling part and meshingly connected with the driving gear.

[0009] Preferably, two groups of internal cooling pipes are provided in the first cooling part and the second cooling part, and the two groups of internal cooling pipes are connected. The other ends of the two groups of internal cooling pipes extend to the outside of the first cooling part and the second cooling part to form a connecting pipe, and the connecting pipe is connected to the cooling water circulation machine through a pipe.

[0010] Preferably, a sponge pad is provided at the end of the first cooling part.

[0011] Preferably, a storage tray is movably mounted on the twin-screw extruder, and the storage tray is a disc-shaped structure with a recessed side wall. The pipe connecting the second cooling part and the cooling water circulation machine is wound around the storage tray, and a clockwork spring is arranged between the storage tray and the twin-screw extruder.

[0012] Preferably, a through groove is axially opened in the middle of the storage tray, and a pipe groove is radially opened at a position corresponding to the position inside the storage tray. The pipe connecting the second cooling part and the cooling water circulation machine passes through the through groove, passes through the pipe groove, is wound inside the storage tray, and the other end is connected to the second cooling part.

[0013] Beneficial Effects

[0014] The utility model provides an internal and external cooling circulation mechanism for a twin-screw extruder, which has the following beneficial effects:

[0015] During cooling, the cooling water in the first cooling part or the second cooling part can be circulated first. When the material needs to be cooled down quickly in a short time, the cooling water circulation in the first cooling part and the second cooling part is opened at the same time to improve the cooling efficiency. When the material needs to be cooled down slowly for a long time, the second cooling part is rotated to screw part of the second cooling part out of the storage space. At this time, the second cooling part forms an extended cooling part at the output end of the extrusion tube. The material enters the extended cooling part after passing through the extrusion tube, and continues to be cooled by the screwed-out second cooling part to meet the production requirements. Because the first cooling part and the second cooling part are spirally wound on the extrusion tube at the same time, both of them directly cool the material, and the second cooling part is closer to the material after being screwed out, and the cooling effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the second cooling part after the utility model is swung out;

[0020] Figure 3 This is a cross-sectional view of the cooling part of the utility model;

[0021] Figure 4 It is a cross-sectional view of the storage tray of the utility model.

[0022] Legend:

[0023] 1. Twin-screw extruder; 2. Extrusion tube; 3. First cooling section; 4. Storage space; 5. Second cooling section; 6. Cooling water circulation machine; 7. Internal cooling pipeline; 8. Extension cooling section; 9. Motor; 10. Driving gear; 11. Driven gear ring; 12. Storage tray; 13. Through groove; 14. Pipe groove; 15. Connecting pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Embodiment: Twin-screw extruder internal and external cooling circulation mechanism, such as Figure 1-Figure 4 As shown, it includes a twin-screw extruder 1, an extrusion tube 2 is fixedly installed at the output end of the twin-screw extruder 1, and the extrusion tube 2 is a hollow round tube. A cooling water circulation machine 6 is also installed on the twin-screw extruder 1. The material in the twin-screw extruder 1 is extruded from the extrusion tube 2, and is processed and formed into a product after cooling. The cooling water generated in the cooling water circulation machine 6 surrounds the extrusion tube 2, and the extrusion tube 2 cools the extrusion tube 2 and the material in the extrusion tube 2.

[0026] In particular, a first cooling part 3 is fixedly installed on the outer wall of the extrusion tube 2. The first cooling part 3 is a continuous spiral structure with the same pitch. The gap between adjacent turns of the extrusion tube 2 and the first cooling part 3 forms a storage space 4. A second cooling part 5 is movably installed in the storage space 4. The second cooling part 5 is a threaded structure complementary to the first cooling part 3. Further, the internal hollow space of the first cooling part 3 and the second cooling part 5 forms an internal cooling pipe 7. The internal cooling pipe 7 is connected to the output end of the cooling water circulation machine 6. During cooling, only the cooling water in the first cooling part 3 or the second cooling part 5 can be circulated. When the material needs to be cooled quickly in a short time, the cooling water circulation in the first cooling part 3 and the second cooling part 5 is opened at the same time to improve the cooling efficiency. When the material needs to be cooled slowly for a long time, the second cooling part 5 is rotated to screw part of the second cooling part 5 out of the storage space 4. At this time, the second cooling part 5 forms an extended cooling part 8 at the output end of the extrusion tube 2. The material passes through the extrusion tube 2 and enters the extended cooling part 8. The material continues to be cooled by the screwed-out second cooling part 5 to meet the production requirements.

[0027] In order to facilitate the second cooling part 5 to be rotated out of the storage space 4, a motor 9 is also fixedly installed on the twin-screw extruder 1, and a driving gear 10 is fixedly installed on the output end of the motor 9. A driven gear ring 11 is fixedly installed on the outer wall of the second cooling part 5. The driven gear ring 11 is spirally distributed along the outer wall of the second cooling part 5 and is meshed with the driving gear 10. When the motor 9 is started, the driving gear 10 drives the second cooling part 5 to rotate through the driven gear ring 11, so that the second cooling part 5 does not need to be manually rotated out.

[0028] Furthermore, two groups of internal cooling pipes 7 are provided in the first cooling part 3 and the second cooling part 5, and the two groups of internal cooling pipes 7 are connected. The other ends of the two groups of internal cooling pipes 7 extend to the outside of the first cooling part 3 and the second cooling part 5 to form a connecting pipe 15. The connecting pipe 15 is connected to the cooling water circulation machine 6 through a pipe. During cooling, cold water is pumped from the cooling water circulation machine 6 through the pipe into one group of internal cooling pipes 7, surrounds the extrusion tube 2 once to cool the material, and then the gradually heated cooling water returns from the other group of internal cooling pipes 7 through the pipe back to the cooling water circulation machine 6 to be refrigerated again, completing a cooling water cycle and continuously cooling down. The cooling water circulation machine 6 is a prior art and will not be described in detail here.

[0029] When the second cooling part 5 is rotated out, the pipe on the second cooling part 5 is also rotated into the receiving space 4 to wrap around the extruded tube 2, thereby playing a receiving role.

[0030] Furthermore, a sponge pad is provided at the end of the first cooling part 3 so that the pipe connected to the second cooling part 5 is protected when passing through the end of the first cooling part 3 and entering the storage space 4, so as to avoid wear of the first cooling part 3 on the pipe.

[0031] In a preferred embodiment, a storage tray 12 is also fixedly mounted on the twin-screw extruder 1. The storage tray 12 is a disc-shaped structure with a recessed side wall. When the second cooling part 5 is stored in the storage space 4, the connected pipe can be wrapped around the storage tray 12 for storage. Furthermore, the storage tray 12 is fixedly connected to the twin-screw extruder 1 through a clockwork spring, so that the storage tray 12 has a reset tendency, so that the storage tray 12 can actively rotate to wrap and store the pipe connected to the second cooling part 5.

[0032] Furthermore, a through groove 13 is axially opened in the middle of the storage tray 12, and a pipe groove 14 is radially opened at a position corresponding to the position inside the storage tray 12. The pipe connected to the second cooling part 5 passes through the through groove 13 and passes through the pipe groove 14. After being wound in the storage tray 12, the other end is connected to the second cooling part 5. When the second cooling part 5 is swung out, the storage tray 12 rotates in the opposite direction to release the pipe wound and stored in the middle of the storage tray 12 and enter the storage space 4. When the second cooling part 5 rotates back into the storage space 4, the storage tray 12 automatically resets and rotates under the action of the clockwork spring, so that the pipe is wound and stored in the storage tray 12.

[0033] The working principle of the utility model is as follows: during cooling, only the cooling water in the first cooling part 3 or the second cooling part 5 can be circulated first. When the material needs to be cooled down quickly in a short time, the cooling water circulation in the first cooling part 3 and the second cooling part 5 can be opened at the same time to improve the cooling efficiency. When the material needs to be cooled down slowly for a long time, the second cooling part 5 is rotated and part of the second cooling part 5 is screwed out of the storage space 4. At this time, the second cooling part 5 forms an extended cooling part 8 at the output end of the extrusion tube 2. The material enters the extended cooling part 8 after passing through the extrusion tube 2, and continues to be cooled by the screwed-out second cooling part 5 to meet the production requirements.

[0034] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A twin-screw extruder internal and external cooling circulation mechanism, comprising a twin-screw extruder (1), an extrusion tube (2) fixedly mounted on the output end of the twin-screw extruder (1), and a cooling water circulation machine (6) mounted on the twin-screw extruder (1), characterized in that: A first cooling part (3) is fixedly mounted on the outer wall of the extruded tube (2), the first cooling part (3) is a continuous spiral structure with the same pitch, the gap between adjacent turns of the extruded tube (2) and the first cooling part (3) forms a storage space (4), a second cooling part (5) is movably mounted in the storage space (4), the second cooling part (5) is a threaded structure complementary to the first cooling part (3), the first cooling part (3) and the second cooling part (5) are hollow inside to form an internal cooling pipe (7), and the internal cooling pipe (7) is connected to the output end of the cooling water circulation machine (6) through a pipe.

2. The internal and external cooling circulation mechanism of the twin-screw extruder according to claim 1, characterized in that: The twin-screw extruder (1) is also fixedly mounted with a motor (9), the output end of the motor (9) is fixedly mounted with a driving gear (10), the outer wall surface of the second cooling portion (5) is fixedly mounted with a driven gear ring (11), the driven gear ring (11) is spirally distributed along the outer wall surface of the second cooling portion (5) and is meshingly connected with the driving gear (10).

3. The internal and external cooling circulation mechanism of the twin-screw extruder according to claim 1, characterized in that: Two groups of internal cooling pipes (7) are provided in the first cooling part (3) and the second cooling part (5), and the two groups of internal cooling pipes (7) are connected to each other. The other ends of the two groups of internal cooling pipes (7) extend to the outside of the first cooling part (3) and the second cooling part (5) to form a connecting pipe (15), and the connecting pipe (15) is connected to the cooling water circulation machine (6) through a pipe.

4. The internal and external cooling circulation mechanism of the twin-screw extruder according to claim 3, characterized in that: A sponge pad is provided at the end of the first cooling part (3).

5. The internal and external cooling circulation mechanism of the twin-screw extruder according to claim 1, characterized in that: A storage tray (12) is also movably mounted on the twin-screw extruder (1). The storage tray (12) is a disc-shaped structure with a recessed side wall. The pipe connecting the second cooling part (5) and the cooling water circulation machine (6) is wound around the storage tray (12). A clockwork spring is arranged between the storage tray (12) and the twin-screw extruder (1).

6. The internal and external cooling circulation mechanism of the twin-screw extruder according to claim 5, characterized in that: A through groove (13) is axially opened in the middle of the storage tray (12), and a pipe groove (14) is radially opened at a position inside the storage tray (12) corresponding to the through groove (13); a pipe connecting the second cooling part (5) and the cooling water circulation machine (6) passes through the through groove (13), passes through the pipe groove (14), is wound inside the storage tray (12), and the other end is connected to the second cooling part (5).

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