CN214926957U - Double screw extruder is with preventing popping material vacuum exhaust apparatus - Google Patents
Double screw extruder is with preventing popping material vacuum exhaust apparatus Download PDFInfo
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- CN214926957U CN214926957U CN202120698298.3U CN202120698298U CN214926957U CN 214926957 U CN214926957 U CN 214926957U CN 202120698298 U CN202120698298 U CN 202120698298U CN 214926957 U CN214926957 U CN 214926957U
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Abstract
The utility model discloses a double screw extruder is with preventing emitting material vacuum exhaust apparatus, it includes: the screw rod comprises a first rod part and a second rod part which are coaxially connected from bottom to top, wherein the first rod part is provided with a forward thread with a plurality of exhaust grooves, and the second rod part is provided with a reverse thread; the first exhaust cylinder is sleeved on the outer edge of the first rod part; the second exhaust cylinder is sleeved at the outer edge of the second rod part, and the outer peripheral surface of the part of the first exhaust cylinder extending into the second exhaust cylinder, the inner peripheral surface and the inner bottom surface of the second exhaust cylinder form a reflux condensed liquid collecting and discharging groove together; the exhaust pipe is communicated with the inner cavity of the second exhaust cylinder; and a liquid discharge pipe communicated with the reflux condensed liquid collecting and discharging groove. The utility model provides a double screw extruder the problem of exhaust chamber material bleeding and devolatilizing condensate backward flow in the plastics modification process, effectively ensured the quality of the product of double screw extruder production.
Description
Technical Field
The utility model relates to a vacuum exhaust apparatus, in particular to double screw extruder is with preventing overflowing material vacuum exhaust apparatus.
Background
As is well known, a twin-screw extruder has good charging performance, mixing and plasticizing performance, venting performance and extrusion stability, and is widely used for molding and processing of extruded products. In the plastic modification process, the twin-screw extruder usually adopts a vacuum exhaust mode to discharge low molecular substances in the plastic melt, so as to ensure the performance of the produced plastic product.
However, due to the unreasonable design of the screw structure or the vent of the existing twin-screw extruder, the melted material in the barrel of the twin-screw extruder often overflows from the vent of the extruder to form flash, so that the vent is blocked, the vacuum exhaust system cannot operate normally, and the quality of the produced plastic products is reduced due to the back flow of the devolatilized condensate in the vacuum exhaust chamber to the extruder.
Therefore, the vacuum exhaust device for the conventional twin-screw extruder can be improved to avoid the above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect and provide a double screw extruder is with preventing popping material vacuum exhaust device to effectively avoid double screw extruder to pop the material because of the gas vent and lead to the condition emergence that defect or vacuum exhaust system can't normally function to appear the product in plastics modification process.
A double screw extruder is with preventing emitting material vacuum exhaust apparatus, it is installed on double screw extruder's exhaust shelves material piece, the device includes:
the screw rod is driven by a driving device and comprises a first rod part and a second rod part which are coaxially connected from bottom to top, wherein the first rod part is provided with a forward thread with a plurality of exhaust grooves, the second rod part is provided with a reverse thread, and the diameter of the reverse thread is larger than that of the forward thread;
the inner diameter of the first exhaust cylinder is matched with the diameter of the forward thread, the upper end of the first exhaust cylinder abuts against the lower end face of the second rod part, and the lower end of the first exhaust cylinder is communicated with an exhaust port of the exhaust material retaining block;
the inner diameter of the second exhaust cylinder is in clearance fit with the diameter of the reverse thread, the upper end of the second exhaust cylinder is sealed, the lower end face of the second exhaust cylinder is provided with a through hole for the first exhaust cylinder to partially extend into, and the outer peripheral surface of the first exhaust cylinder extending into the second exhaust cylinder, the inner peripheral surface and the inner bottom surface of the second exhaust cylinder jointly form an annular backflow condensed liquid collecting and discharging groove;
the exhaust pipe is arranged at the upper part of the second exhaust cylinder body and is communicated with the inner cavity of the second exhaust cylinder body; and
and the liquid discharge pipe is arranged at the lower part of the second exhaust cylinder and is communicated with the backflow condensate collecting and discharging groove.
The material overflow preventing vacuum exhaust device for the double-screw extruder further comprises: and the heat conduction oil jacket is arranged around the outer edges of the first exhaust cylinder body and the second exhaust cylinder body.
The material overflow preventing vacuum exhaust device for the double-screw extruder further comprises: the oil inlet pipe is arranged at the lower part of the heat conduction oil jacket and communicated with the heat conduction oil jacket; and the oil outlet pipe is arranged at the upper part of the heat conduction oil jacket and communicated with the heat conduction oil jacket.
In the anti-material-overflow vacuum exhaust device for the double-screw extruder, the heat conduction oil jacket is filled with heat conduction oil with the temperature of 100-200 ℃.
The material overflow preventing vacuum exhaust device for the double-screw extruder further comprises: the gland is connected to the upper end of the second exhaust cylinder body in a sealing way; the driving device is arranged above the gland and connected with the screw rod.
The material overflow preventing vacuum exhaust device for the double-screw extruder further comprises: a vacuum gauge mounted on the exhaust pipe through a connection pipe.
In the anti-overflow vacuum exhaust device for the double-screw extruder, the exhaust pipe and the liquid discharge pipe are both arranged in a downward inclined manner and are both connected with an external vacuum exhaust system through a gas-liquid separation buffer tank.
In the material-overflow-preventing vacuum exhaust device for the double-screw extruder, the length-diameter ratio of the forward threads and the reverse threads is 1-5: 1, and the diameter of the reverse threads is 1-5 cm larger than that of the forward threads.
In the anti-overflow vacuum exhaust device for the double-screw extruder, the depth of the backflow condensate collecting and discharging groove is 1-5 cm, and the width of the backflow condensate collecting and discharging groove is 1-5 cm.
Based on the above technical scheme, the utility model discloses an adopt the screw rod that has two rank series connection reducing positive and negative screw thread, promptly, utilize the downward pushing action of the forward thread of first pole portion, the polymer fuse-element that overflows from the gas vent of exhaust shelves material piece extrudees back the twin-screw extruder, utilize the reverse thread of second pole portion simultaneously to make on the one hand and take away by vacuum exhaust system after the part of easy gasification discharges in the low molecule volatile substance that overflows from the gas vent of exhaust shelves material piece, on the other hand collects the part of easy condensation and discharges in the low molecule volatile substance, thereby solve the problem that twin-screw extruder emits material and devolatilizes the condensate backward flow in the exhaust chamber of plastics modification process well, and then effectively ensured the quality of the product of twin-screw extruder production.
Drawings
Fig. 1 is a schematic structural diagram of the material-overflowing preventing vacuum exhaust device for the double-screw extruder.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides an anti-material-overflowing vacuum exhaust apparatus for a twin-screw extruder, which includes:
the screw comprises a first rod part 1 and a second rod part 2 which are coaxially connected from bottom to top, wherein the first rod part 1 is provided with a forward thread, a plurality of exhaust grooves (not shown) are arranged on the screw edge of the forward thread, the second rod part 2 is provided with a reverse thread, and the diameter of the reverse thread is larger than that of the forward thread of the first rod part 1; in the embodiment, the length-diameter ratio of the forward thread of the first rod part 1 to the reverse thread of the second rod part 2 is 1-5: 1, and the diameter of the reverse thread of the second rod part 2 is 1-5 cm larger than that of the forward thread of the first rod part 1;
the first exhaust cylinder 3 is sleeved on the outer edge of the first rod part 1, the inner diameter of the first exhaust cylinder is matched with the diameter of the forward thread of the first rod part 1, the upper end and the lower end of the first exhaust cylinder 3 are respectively provided with an opening, the lower end of the first exhaust cylinder is communicated with an exhaust port on an exhaust blocking block of a glow-removing cylinder of a double-screw extruder (not shown), and the upper end of the first exhaust cylinder abuts against the lower end face of the second rod part 2;
the second exhaust cylinder 4 is sleeved on the outer edge of the second rod part 2, the inner diameter of the second exhaust cylinder 4 is in clearance fit with the diameter size of the reverse thread of the second rod part 2, the lower end of the second exhaust cylinder 4 is closed, the upper end of the second exhaust cylinder 4 is opened, a through hole for the first exhaust cylinder 3 to partially extend into is formed in the lower end face of the second exhaust cylinder, and the outer peripheral surface of the first exhaust cylinder 3 extending into the second exhaust cylinder 4, the inner peripheral surface and the inner bottom surface of the second exhaust cylinder 4 jointly form an annular backflow condensate collecting and discharging groove 5; in the embodiment, the first exhaust cylinder 3 extends into the second exhaust cylinder 4 by 1-5 cm, that is, the depth of the backflow condensate collecting and discharging groove 5 is 1-5 cm, the inner diameter of the second exhaust cylinder 4 is 1-5 cm larger than the outer diameter of the first exhaust cylinder 3, that is, the width of the backflow condensate collecting and discharging groove 5 is 1-5 cm;
the exhaust pipe 6 is arranged at the upper part of the second exhaust cylinder 4 and communicated with the inner cavity of the second exhaust cylinder; in the present embodiment, the exhaust pipe 6 is provided obliquely downward (i.e., the inlet of the exhaust pipe 6 communicating with the second exhaust cylinder 4 is higher than the outlet of the exhaust pipe 6), and is connected to an external vacuum exhaust system through a gas-liquid separation buffer tank (not shown);
a drain pipe 7 disposed at the lower part of the second exhaust cylinder 4 and communicated with the return condensate collecting and discharging tank 5, wherein in the embodiment, the drain pipe 7 is disposed in a downward inclined manner, so that the liquid level in the drain pipe 7 and the pipeline connected with the same is not higher than the height of the tank wall of the return condensate collecting and discharging tank 5, and the drain pipe 7 is connected with an external vacuum exhaust system through a gas-liquid separation buffer tank (not shown);
a gland 8 hermetically connected to an opening at the upper end of the second exhaust cylinder 4;
a driving device 9 arranged above the gland 8 and connected with the screw rod; in the present embodiment, the driving device 9 includes a driving motor, a reducer, a transmission case, a coupling, etc., and the rotation speed thereof is controlled by a frequency converter;
a heat conducting oil jacket 10 arranged around the outer edges of the first exhaust cylinder 3 and the second exhaust cylinder 4; in the embodiment, the temperature of the heat conduction oil filled in the heat conduction oil jacket 10 is 100-200 ℃;
an oil inlet pipe 11 arranged at the lower part of the heat conducting oil jacket 10 and communicated with the heat conducting oil jacket; in the present embodiment, the oil inlet pipe 11 is horizontally disposed;
an oil outlet pipe 12 arranged at the upper part of the heat conducting oil jacket 11 and communicated with the heat conducting oil jacket; in this embodiment, the flowline 12 is horizontally disposed; and
a vacuum gauge 14 mounted on the exhaust pipe 6 through a connection pipe 13.
The utility model discloses a twin-screw extruder prevent emitting material vacuum exhaust apparatus's theory of operation as follows:
firstly, the utility model is installed on the exhaust material retaining block of the brilliance-removing barrel of the double-screw extruder (not shown in the figure), and the first exhaust barrel 3 is communicated with the exhaust port of the exhaust material retaining block. In the plastic modification processing process of the double-screw extruder, the driving device 9 is started to drive the screw to rotate, and the forward thread of the first rod part 1 has a downward pushing effect in the rotating process, so that the polymer melt overflowing from the exhaust port of the exhaust material retaining block can be extruded back into the double-screw extruder; meanwhile, low molecular volatile matters overflowing from the exhaust port of the exhaust gas baffle block rise into the second exhaust barrel 4 through the spiral groove space of the forward thread of the first rod part 1 and the exhaust groove on the spiral edge thereof, volatile matters easy to gasify in the low molecular volatile matters enter the exhaust pipe 6 through the spiral groove space of the reverse thread of the second rod part 2 and the gap between the spiral edge thereof and the inner wall of the second exhaust barrel 4, then are pumped away by an external vacuum exhaust system, while easily condensed parts in the low molecular volatile matters are condensed into backflow liquid on the inner wall of the gland 8 with relatively low temperature and the partial reverse thread surface of the second rod part 2 nearby, most of the backflow condensate liquid is lifted to the exhaust pipe 6 through the reverse thread along the inner wall of the second exhaust barrel 4 and flows out, and the remaining part of the backflow condensate liquid which is not lifted flows into the backflow condensate collecting and discharging groove 5 at the bottom of the second exhaust barrel 4, and flows out through a liquid discharge pipe 7; in addition, under the action of 100-200 ℃ heat conduction oil in the heat conduction oil jacket 10, the first exhaust cylinder 3 and the second exhaust cylinder 4 can be in a higher temperature environment, so that the condensation amount of volatile matters is further reduced.
To sum up, the utility model discloses simple structure, safe and reliable can solve the problem that twin-screw extruder bleeds the material and takes off to wave the condensate backward flow in the plastics modification process exhaust chamber well to the quality of the product of twin-screw extruder production has effectively been ensured.
The above embodiments are provided only for the purpose of illustration, not for the limitation of the present invention, and those skilled in the relevant art can make various changes or modifications without departing from the spirit and scope of the present invention, therefore, all equivalent technical solutions should also belong to the scope of the present invention, and should be defined by the claims.
Claims (9)
1. An anti-material-overflowing vacuum exhaust device for a double-screw extruder, which is arranged on an exhaust material baffle block of the double-screw extruder, and is characterized by comprising:
the screw rod is driven by a driving device and comprises a first rod part and a second rod part which are coaxially connected from bottom to top, wherein the first rod part is provided with a forward thread with a plurality of exhaust grooves, the second rod part is provided with a reverse thread, and the diameter of the reverse thread is larger than that of the forward thread;
the inner diameter of the first exhaust cylinder is matched with the diameter of the forward thread, the upper end of the first exhaust cylinder abuts against the lower end face of the second rod part, and the lower end of the first exhaust cylinder is communicated with an exhaust port of the exhaust material retaining block;
the inner diameter of the second exhaust cylinder is in clearance fit with the diameter of the reverse thread, the upper end of the second exhaust cylinder is sealed, the lower end face of the second exhaust cylinder is provided with a through hole for the first exhaust cylinder to partially extend into, and the outer peripheral surface of the first exhaust cylinder extending into the second exhaust cylinder, the inner peripheral surface and the inner bottom surface of the second exhaust cylinder jointly form an annular backflow condensed liquid collecting and discharging groove;
the exhaust pipe is arranged at the upper part of the second exhaust cylinder body and is communicated with the inner cavity of the second exhaust cylinder body; and
and the liquid discharge pipe is arranged at the lower part of the second exhaust cylinder and is communicated with the backflow condensate collecting and discharging groove.
2. The apparatus of claim 1, wherein the apparatus further comprises: and the heat conduction oil jacket is arranged around the outer edges of the first exhaust cylinder body and the second exhaust cylinder body.
3. The apparatus of claim 2, wherein the apparatus further comprises: the oil inlet pipe is arranged at the lower part of the heat conduction oil jacket and communicated with the heat conduction oil jacket; and the oil outlet pipe is arranged at the upper part of the heat conduction oil jacket and communicated with the heat conduction oil jacket.
4. The anti-material-overflowing vacuum exhaust device for the double-screw extruder according to claim 2 or 3, wherein the heat-conducting oil jacket is filled with heat-conducting oil at a temperature of 100-200 ℃.
5. The apparatus of claim 1, wherein the apparatus further comprises: the gland is connected to the upper end of the second exhaust cylinder body in a sealing way; the driving device is arranged above the gland and connected with the screw rod.
6. The apparatus of claim 1, wherein the apparatus further comprises: a vacuum gauge mounted on the exhaust pipe through a connection pipe.
7. The apparatus of claim 1, wherein the exhaust pipe and the drain pipe are both inclined downward and are connected to an external vacuum exhaust system via a gas-liquid separation buffer tank.
8. The anti-flash vacuum exhaust device for the double-screw extruder as claimed in claim 1, wherein the length-diameter ratio of the forward thread and the backward thread is 1-5: 1, and the diameter of the backward thread is 1-5 cm larger than that of the forward thread.
9. The anti-flash vacuum exhaust device for the double-screw extruder as claimed in claim 1, wherein the depth of the backflow condensate collecting and discharging groove is 1-5 cm, and the width of the backflow condensate collecting and discharging groove is 1-5 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120698298.3U CN214926957U (en) | 2021-04-07 | 2021-04-07 | Double screw extruder is with preventing popping material vacuum exhaust apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120698298.3U CN214926957U (en) | 2021-04-07 | 2021-04-07 | Double screw extruder is with preventing popping material vacuum exhaust apparatus |
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| CN214926957U true CN214926957U (en) | 2021-11-30 |
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| CN202120698298.3U Active CN214926957U (en) | 2021-04-07 | 2021-04-07 | Double screw extruder is with preventing popping material vacuum exhaust apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114953399A (en) * | 2022-05-31 | 2022-08-30 | 江苏诚盟装备股份有限公司 | Novel co-directional parallel multi-screw deep devolatilization extruder |
-
2021
- 2021-04-07 CN CN202120698298.3U patent/CN214926957U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114953399A (en) * | 2022-05-31 | 2022-08-30 | 江苏诚盟装备股份有限公司 | Novel co-directional parallel multi-screw deep devolatilization extruder |
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