Exhaust device of double-screw extruder

Abstract

The utility model relates to an exhaust device of a double-screw extruder, which comprises an exhaust chamber, two exhaust passages, a first communicating pipeline, a second communicating pipeline, a third communicating pipeline, a first main vacuum pipeline, a second main vacuum pipeline and two condensers, one end of each exhaust passage is communicated with the exhaust chamber, and the other end of each exhaust passage is closed in a working state; one end of the first communicating pipeline is communicated with one exhaust channel, the other end of the first communicating pipeline is communicated with one end of the first main vacuum pipeline, and the other end of the first main vacuum pipeline is communicated with one condenser; one end of the second communicating pipeline is communicated with the other exhaust channel, the other end of the second communicating pipeline is communicated with one end of the second main vacuum pipeline, and the other end of the second main vacuum pipeline is communicated with the other condenser; the first end and the second end of the third communicating pipeline are communicated with the first communicating pipeline and the second communicating pipeline respectively, and the third end of the third communicating pipeline is communicated with a condenser. The device provided by the utility model ensures the stable operation of the system and prevents a large amount of overflowing materials from blocking.

Description

Technical Field

[0001] The utility model relates to an exhaust device of a twin-screw extruder. Background Art

[0002] During the production process of melt direct spinning of polyester filament, waste polyester bottle chips are used to produce polyester filament. The chips are fed into the barrel horizontally and vertically, and the driving device of the screw drives the screw to rotate and extrude. The solid polyester bottle chips are extruded and sheared by the screw in the heated barrel cavity and become molten state. During the extrusion process, the water, low-molecular volatiles and generated bubbles in the bottle chips need to be discharged. A negative pressure area is formed at the exhaust port under the action of a high vacuum pump, and the gas volatiles are discharged from the exhaust chamber. The vacuum pump pumps the gas volatiles to the condenser through a pipeline for cooling, and discharges the water and gas, so as to improve the vacuum degree of the exhaust port, thereby removing the water and low-molecular substances in the molten material.

[0003] However, the extracted low-molecular substances and impurities are easily accumulated and fouled at the pipeline of the exhaust port of the screw extruder, resulting in frequent blockages. The fouling is hard and the pipeline is long and difficult to clean. The daily cleaning operation has a large workload and a long cleaning time, resulting in a long ventilation time between the material chamber and the exhaust port. The gas volatiles in the exhaust chamber cannot be completely discharged, resulting in a decrease in vacuum degree, making the extruded material unstable and the melt viscosity decrease. The material overflows from the exhaust port. A small amount of material will affect the discharge of volatiles and affect the product quality. A large amount of material overflow will block the vacuum pipeline and even cause the screw extruder to stop running. Content of the Utility Model

[0004] The purpose of the utility model is to provide an exhaust device of a twin-screw extruder, so as to solve the problems that in the production process of polyester recycled polyester filament, the vacuum short-circuit pipeline at the exhaust port of the screw extruder is frequently blocked, the daily cleaning workload is large, the cleaning is not thorough, resulting in low vacuum degree at the exhaust port of the screw extruder and fluctuations in melt viscosity.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0006] A double-screw extruder exhaust device, comprising an exhaust chamber, two exhaust channels, a first communication pipeline, a second communication pipeline, a third communication pipeline, a first main vacuum pipeline, a second main vacuum pipeline, and two condensers. One end of each exhaust channel communicates with the exhaust chamber, and the other end of each exhaust channel is closed in the working state. One end of the first communication pipeline communicates with one of the exhaust channels, the other end of the first communication pipeline communicates with one end of the first main vacuum pipeline, and the other end of the first main vacuum pipeline communicates with one of the condensers. One end of the second communication pipeline communicates with the other exhaust channel, the other end of the second communication pipeline communicates with one end of the second main vacuum pipeline, and the other end of the second main vacuum pipeline communicates with the other condenser. The third communication pipeline has a first end, a second end, and a third end. The first end and the second end are respectively connected to the first communication pipeline and the second communication pipeline, and the third end is connected to one of the condensers.

[0007] According to some implementation aspects of the present invention, the other end of the first communication pipeline and one end of the first main vacuum pipeline are connected through a first valve, and the other end of the second communication pipeline and one end of the second main vacuum pipeline are connected through a second valve.

[0008] According to some implementation aspects of the present invention, the third communication pipeline includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline. The first pipeline has a first end and a second end. The first end and the second end are respectively connected to the first communication pipeline and the second communication pipeline. One end of the second pipeline is connected to the first pipeline, the other end of the second pipeline is connected to one end of the third pipeline, the other end of the third pipeline is connected to one end of the fourth pipeline, and the other end of the fourth pipeline is connected to the condenser. A third valve is provided on the first pipeline, and a fourth valve is provided on the fourth pipeline.

[0009] According to some implementation aspects of the present invention, the first pipeline is perpendicular to the second pipeline, the second pipeline is perpendicular to the third pipeline, and the third pipeline is perpendicular to the fourth pipeline.

[0010] According to some implementation aspects of the present invention, the first valve, the second valve, the third valve, and the fourth valve are all flange ball valves.

[0011] According to some implementation aspects of the present utility model, the other end of the exhaust passage is closed by a locking assembly. The locking assembly includes a sealing plate and a plurality of locking units. The sealing plate covers the other end of the exhaust passage, and a slot recessed towards its center is formed at the edge of the sealing plate; the locking unit includes a fixing member, a screw rod, and a nut. The fixing member is fixedly connected to the exhaust passage. One end of the screw rod is rotatably connected to the fixing member, and the other end of the screw rod is provided with the nut;

[0012] The device has a locked state and a released state. When the device is in the locked state, the screw rod is caught in the slot, and the nut abuts against the upper side of the sealing plate; when the device is in the released state, the nut is away from the upper side of the sealing plate, and the screw rod is away from the slot.

[0013] According to some implementation aspects of the present utility model, the nut includes a body and a lifting ring. The body is threadedly connected to the screw rod, and the lifting ring is arranged at the upper end of the body.

[0014] According to some implementation aspects of the present utility model, the fixing member includes a first plate and two second plates. The two second plates are respectively arranged at opposite ends on the same side of the first plate, and the first plate is perpendicular to the second plates.

[0015] According to some implementation aspects of the present utility model, four locking units are provided, and the four locking units are respectively arranged at the four corners of the sealing plate.

[0016] According to some implementation aspects of the present utility model, a handle is arranged at the edge of the sealing plate.

[0017] According to some implementation aspects of the present utility model, the exhaust passage is in a cubic shape.

[0018] According to some implementation aspects of the present utility model, the exhaust passage includes a main body and an extension platform. The extension platform is arranged at one end of the main body away from the exhaust chamber, and the extension platform is arranged around the outer periphery of the upper end of the main body; when the device is in the locked state, the sealing plate abuts against the extension platform.

[0019] Due to the application of the above technical solutions, the present utility model has the following advantages compared with the prior art:

[0020] The exhaust device of the twin-screw extruder provided by the present utility model, by setting the first communication pipeline, the second communication pipeline, and the third communication pipeline, while ensuring the normal exhaust of the exhaust chamber, isolates and disassembles the first main vacuum pipeline and the second main vacuum pipeline to dredge the blockage, ensures the stable operation of the screw vacuum system, prevents a large amount of material from overflowing and blocking the main vacuum pipeline, and does not cause the screw to stop, effectively improving the stability of the system operation; the detachable convenience is improved, the cleaning time is shortened from 5 minutes to within 3 minutes, and the efficiency and quality of cleaning the scale are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 is a structural diagram of the exhaust device of the twin-screw extruder provided by the present utility model;

[0022] Attached Figure 2 is Figure 1 an enlarged view of the first communication pipeline, the second communication pipeline, the third communication pipeline, the first main vacuum pipeline, and the second main vacuum pipeline in

[0023] Attached Figure 3 is a partial enlarged view of the locking assembly of the exhaust device of the twin-screw extruder provided by the present utility model;

[0024] Attached Figure 4 is the front view of the exhaust device of the twin-screw extruder provided by the present utility model;

[0025] Attached Figure 5 is Figure 4 an enlarged view of the cooperation between the locking assembly and the sealing plate in

[0026] Attached Figure 6 is the top view of the sealing plate of the exhaust device of the twin-screw extruder provided by the present utility model;

[0027] Attached Figure 7 is a structural diagram of the exhaust device of the twin-screw extruder provided by the present utility model from another perspective.

[0028] In the above drawings:

[0029] 1 - First communication pipeline; 2 - Second communication pipeline; 3 - Third communication pipeline, 31 - First pipeline, 32 - Second pipeline, 33 - Third pipeline, 34 - Fourth pipeline; 4 - First main vacuum pipeline; 5 - Second main vacuum pipeline; 6 - Condenser; 7 - Exhaust chamber; 8 - Exhaust passage, 81 - Main body, 82 - Extension platform;

[0030] 9 - Locking assembly, 91 - Screw, 92 - Nut, 93 - First plate, 94 - Second plate, 95 - Sealing plate, 951 - Groove;

[0031] 10 - Handle; 11 - First valve; 12 - Second valve; 13 - Third valve; 14 - Fourth valve. Detailed implementation mode

[0032] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] See Figures 1 to 7 The exhaust device of the twin-screw extruder shown in the figure. The device includes an exhaust chamber 7, two exhaust channels 8, a first communication pipeline 1, a second communication pipeline 2, a third communication pipeline 3, a first main vacuum pipeline 4, a second main vacuum pipeline 5, and two condensers 6, where:

[0035] The exhaust chamber 7 is communicated with the barrel of the twin-screw extruder; one end of the exhaust channel 8 is communicated with the exhaust chamber 7, and the other end of the exhaust channel 8 is closed in the working state; see Figures 1 - 3 , the exhaust channel 8 includes a main body 81 and an extension table 82. The main body 81 is in the shape of a hollow cube, and the extension table 82 is arranged at one end of the main body 81 away from the exhaust chamber 7, and the extension table 82 is arranged around the outer periphery of the upper end of the main body 81.

[0036] One end of the first communication pipeline 1 is communicated with one exhaust channel 8, the other end of the first communication pipeline 1 is communicated with one end of the first main vacuum pipeline 4, and the other end of the first main vacuum pipeline 4 is communicated with one condenser 6; one end of the second communication pipeline 2 is communicated with the other exhaust channel 8, the other end of the second communication pipeline 2 is communicated with one end of the second main vacuum pipeline 5, and the other end of the second main vacuum pipeline 5 is communicated with the other condenser 6. Among them, the other end of the first communication pipeline 1 and one end of the first main vacuum pipeline 4 are communicated through a first valve 11, and the other end of the second communication pipeline 2 and one end of the second main vacuum pipeline 5 are communicated through a second valve 12.

[0037] The third communication pipeline 3 has a first end (as indicated by a in Figure 1 ), a second end (as indicated by b in Figure 1 ), a third end (as indicated byFigure 1 (as indicated by c), the first end and the second end are respectively connected to the first connecting pipeline 1 and the second connecting pipeline 2, the third end is connected to a condenser 6. In an embodiment, the third connecting pipeline 3 includes a first pipeline 31, a second pipeline 32, a third pipeline 33, and a fourth pipeline 34. The first pipeline 31 has a first end and a second end, and the first end and the second end are respectively connected to the first connecting pipeline 1 and the second connecting pipeline 2. One end of the second pipeline 32 is connected to the first pipeline 31, the other end of the second pipeline 32 is connected to one end of the third pipeline 33, the other end of the third pipeline 33 is connected to one end of the fourth pipeline 34, and the other end (i.e., the third end) of the fourth pipeline 34 is connected to the condenser 6. A third valve 13 is provided on the first pipeline 31. Preferably, two third valves 13 are provided. One third valve 13 is close to the first connecting pipeline 1, and the other third valve 13 is close to the second connecting pipeline 2. One end of the second pipeline 32 is preferably connected to the pipeline between the two third valves 13 on the first pipeline 31; a fourth valve 14 is provided on the fourth pipeline 34.

[0038] Preferably, the first pipeline 31 is perpendicular to the second pipeline 32, the second pipeline 32 is perpendicular to the third pipeline 33, and the third pipeline 33 is perpendicular to the fourth pipeline 34.

[0039] Preferably, the first valve 11, the second valve 12, the third valve 13, and the fourth valve 14 are all flange ball valves.

[0040] The length of the first connecting pipeline 1 in this example is much smaller than that of the first main vacuum pipeline 4, and the length of the second connecting pipeline 2 is much smaller than that of the second main vacuum pipeline 5, effectively solving the problems of low vacuum degree at the exhaust port of the screw extruder and melt viscosity fluctuation caused by difficult cleaning due to the pipeline length, and improving the efficiency and quality of cleaning scale deposits. Preferably, the length of the first connecting pipeline 1 is equal to the length of the second connecting pipeline 2.

[0041] The specific implementation manner of the exhaust device of the twin-screw extruder in this example is as follows:

[0042] When the first main vacuum pipeline 4 and the second main vacuum pipeline 5 are blocked and need to be cleaned, close the first valve 11 and the second valve 12, open the third valve 13 and the fourth valve 14. The gas discharged from the exhaust chamber 7 enters the condenser 6 through the third communication pipeline 3 for cooling, which can ensure the normal exhaust of the exhaust chamber 7. At the same time, isolate and disassemble the first main vacuum pipeline 4 and the second main vacuum pipeline 5 to dredge the blockage. After the blockage is cleaned, reinstall the first main vacuum pipeline 4 and the second main vacuum pipeline 5. Next, close the third valve 13 and the fourth valve 14, open the first valve 11 and the second valve 12. The gas discharged from the exhaust chamber 7 enters one condenser 6 through the first communication pipeline 1 and the first main vacuum pipeline 4, and enters the other condenser 6 through the second communication pipeline 2 and the first main vacuum pipeline 4. The first communication pipeline 1, the second communication pipeline 2, and the third communication pipeline 3 are switched with the first main vacuum pipeline 4 and the second main vacuum pipeline 5 to solve the production hidden danger that the screw extruder stops due to a large amount of material overflow blocking the vacuum pipeline; the detachable convenience is improved, and the cleaning time is shortened from 5 minutes to within 3 minutes, improving the operation efficiency and operation quality.

[0043] The other end of the existing exhaust passage 8 is open, and a sealing plate cover is arranged at the other end of the exhaust passage 8. Corresponding installation holes are provided in the plate body and the exhaust passage 8, and the sealing plate is fixedly connected to the exhaust passage 8 by installing fasteners (bolt and nut assemblies) in the installation holes. The problems are as follows: during the disassembly and installation of the fasteners, the fasteners are easily lost, affecting the operation progress; the fasteners are easily loosened and fallen off, affecting the sealing performance of the exhaust passage 8; when the exhaust passage 8 needs to be cleaned and the sealing plate is removed, it takes time and effort to loosen the fasteners with tools, and the operation is cumbersome.

[0044] To ensure the convenient removal of the sealing plate at the other end of the exhaust passage 8 and the sealing performance of the exhaust device, the other end of the exhaust passage 8 is closed by a locking assembly 9, so that the exhaust chamber 7 is closed.

[0045] See Figures 3 - 5, the locking assembly 9 includes a sealing plate 95 and a plurality of locking units. The other end of the exhaust passage 8 has an open end. The sealing plate 95 is covered on the other end of the exhaust passage 8. The other end of the exhaust passage 8 faces upward, that is, the sealing plate 95 abuts against the extension table; a slot 951 recessed toward the center of the sealing plate 95 is formed on the edge of the sealing plate 95; the locking unit includes a fixing member, a screw 91, and a nut 92. The fixing member is located below the sealing plate 95 and is fixedly connected to the exhaust passage 8. One end (lower end) of the screw 91 is rotatably connected to the fixing member through a rotating shaft, and a nut 92 is provided at the other end (upper end) of the screw 91; the device has a locked state and a released state. When the device is in the locked state, the screw 91 is engaged in the slot 951, the screw 91 extends in the vertical direction, and the nut 92 abuts against the upper side of the sealing plate 95, and the nut 92 is located above the sealing plate 95; when the device is in the released state, the nut 92 is away from the upper side of the sealing plate 95 and does not abut against the upper side of the sealing plate 95, and the screw 91 is away from the slot 951, and the screw 91 is inclined.

[0046] See Figures 3 - 5 , the nut 92 includes a body and a lifting ring. The body and the lifting ring are an integral structure. The body is threadedly connected to the screw 91, and the lifting ring is connected to the upper end of the body. The lifting ring is provided to facilitate the operation of the nut 92 by hand.

[0047] The fixing member includes a first plate 93 and two second plates 94. The two second plates 94 are respectively arranged at opposite ends on the same side of the first plate 93. The two second plates 94 are both arranged on the upper side of the first plate 93. The second plate 94 is welded to the extension table 82. The first plate 93 is perpendicular to the second plate 94, that is, the fixing member has a straight U-shaped accommodation groove. Opposite ends of the rotating shaft respectively pass through the two second plates 94. A connecting portion is provided at one end (lower end) of the screw 91, and the connecting portion at one end of the screw 91 is sleeved on the rotating shaft.

[0048] The specific implementation manner of the locking assembly 9 in this example is as follows: If the current device is in the locked state and needs to be changed from the locked state to the released state, loosen the nut 92 so that the nut 92 is away from the upper side of the sealing plate 95 and does not abut against the upper side of the sealing plate 95, and then rotate the screw 91 away from the slot 951. At this time, the sealing plate 95 can be removed; when it is necessary to change from the released state to the locked state, the sealing plate 95 is arranged at the other end of the exhaust passage 8, rotate the screw 91 into the slot 951, and then tighten the nut 92 so that the nut 92 abuts against the upper side of the sealing plate 95. At this time, the sealing plate 95 is firmly fixed on the exhaust passage 8. The operation is fast, there is no need to open holes in the exhaust passage 8, the sealing performance between the sealing plate 95 and the exhaust passage 8 is good; the locking unit will not be separated from the exhaust passage 8.

[0049] In some embodiments, a handle 10 is provided at the edge of the sealing plate 95 to facilitate the removal of the sealing plate 95; the sealing plate 95 is cubic, and slots 951 are provided at the four top corners of the sealing plate 95. Correspondingly, there are four locking units, and the locking units correspond to the sealing plate 95 one by one. The four top corners of the sealing plate 95 are inclined planes, so that the cross-section of the sealing plate 95 is an octagon to prevent the sharp corners from hurting the operator.

[0050] The advantages of the exhaust device of the twin-screw extruder in this example are as follows:

[0051] By providing the first communication pipeline, the second communication pipeline, and the third communication pipeline, while ensuring the normal exhaust of the exhaust chamber, the first main vacuum pipeline and the second main vacuum pipeline are isolated and disassembled to dredge the blockage, ensuring the stable operation of the screw vacuum system, preventing a large amount of material from overflowing and blocking the main vacuum pipeline, and preventing the screw from stopping; the detachable convenience is improved, the cleaning time is shortened from 5 minutes to within 3 minutes, improving the efficiency and quality of cleaning the scale; preventing the system from breaking vacuum and affecting production, solving the problem that the pipeline of the exhaust device of the twin-screw extruder is blocked during the production of polyester filament and affecting production, and effectively improving the stability of the system operation.

[0052] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A venting device for a twin-screw extruder, characterized in that, It includes an exhaust chamber, two exhaust channels, a first connecting pipeline, a second connecting pipeline, a third connecting pipeline, a first main vacuum pipeline, a second main vacuum pipeline, and two condensers. One end of each of the exhaust channels is communicated with the exhaust chamber, and the other end of the exhaust channel is closed in the working state. One end of the first connecting pipeline is communicated with one of the exhaust channels, the other end of the first connecting pipeline is communicated with one end of the first main vacuum pipeline, and the other end of the first main vacuum pipeline is communicated with one of the condensers. One end of the second connecting pipeline is communicated with the other exhaust channel, the other end of the second connecting pipeline is communicated with one end of the second main vacuum pipeline, and the other end of the second main vacuum pipeline is communicated with the other condenser. The third connecting pipeline has a first end, a second end, and a third end. The first end and the second end are respectively communicated with the first connecting pipeline and the second connecting pipeline, and the third end is communicated with one of the condensers.

2. The exhaust device of the twin-screw extruder according to claim 1, characterized in that, The other end of the first connecting pipeline and one end of the first main vacuum pipeline are communicated through a first valve, and the other end of the second connecting pipeline and one end of the second main vacuum pipeline are communicated through a second valve.

3. The exhaust device of the twin-screw extruder according to claim 2, characterized in that, The third connecting pipeline includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline. The first pipeline has a first end and a second end. The first end and the second end are respectively communicated with the first connecting pipeline and the second connecting pipeline. One end of the second pipeline is communicated with the first pipeline, the other end of the second pipeline is communicated with one end of the third pipeline, the other end of the third pipeline is communicated with one end of the fourth pipeline, and the other end of the fourth pipeline is communicated with the condenser. A third valve is provided on the first pipeline, and a fourth valve is provided on the fourth pipeline.

4. The exhaust device of the twin-screw extruder according to claim 3, characterized in that, The first pipeline is perpendicular to the second pipeline, the second pipeline is perpendicular to the third pipeline, and the third pipeline is perpendicular to the fourth pipeline.

5. The exhaust device of the twin-screw extruder according to claim 3, characterized in that, The first valve, the second valve, the third valve, and the fourth valve are all flange ball valves.

6. The exhaust device of the twin-screw extruder according to claim 1, wherein, The other end of the exhaust channel is closed by a locking assembly. The locking assembly includes a sealing plate and a plurality of locking units. The sealing plate covers the other end of the exhaust channel, and a groove recessed towards its center is provided at the edge of the sealing plate. The locking unit includes a fixing member, a screw rod, and a nut. The fixing member is fixedly connected to the exhaust channel, one end of the screw rod is rotatably connected to the fixing member, and the other end of the screw rod is provided with the nut. The device has a locking state and a loosening state. When the device is in the locking state, the screw rod is stuck in the groove, and the nut abuts against the upper side of the sealing plate. When the device is in the loosening state, the nut is away from the upper side of the sealing plate, and the screw rod is away from the groove.

7. The exhaust device of the twin-screw extruder according to claim 6, characterized in that The nut includes a body and a lifting ring. The body is threadedly connected to the screw rod, and the lifting ring is provided at the upper end of the body.

8. The exhaust device of the twin-screw extruder according to claim 6, characterized in that, The fixing member includes a first plate and two second plates. The two second plates are respectively arranged at opposite ends on the same side of the first plate, and the first plate is perpendicular to the second plates.

9. The exhaust device of the twin-screw extruder according to claim 6, characterized in that, Four locking units are provided.

10. The exhaust device of the twin-screw extruder according to claim 6, characterized in that, A handle is provided at the edge of the sealing plate.

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