Cylinder structure of exhaust type single-screw extruder
By incorporating a side feed inlet, a rear exhaust port, and a cooling water jacket into the barrel structure of the single-screw extruder, the problems of gas and water vapor discharge are solved, ensuring the molten state and pushing capacity of the recycled plastic, thereby improving production efficiency and product quality.
Patent Information
- Application Number
- CN202423017425.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-09
AI Technical Summary
In the process of recycling plastics, the barrel structure of existing single-screw extruders is difficult to effectively expel gas and water vapor, causing the recycled plastic to melt and adhere to the screw channel, affecting the pushing capacity and failing to effectively keep the plastic in a molten state, thus affecting production efficiency and product quality.
A barrel structure for a vented single-screw extruder was designed, including a feeding barrel and an extrusion barrel. It is equipped with a side feeding inlet, a rear vent, a cooling water jacket, and a vacuum venting device to ensure timely discharge of gas and water vapor, and to keep the plastic in a molten state through a heater to prevent adhesion.
It achieves efficient discharge of gas and water vapor, maintains the molten state of plastic, ensures the pushing capacity of a single screw, and improves production efficiency and the quality of recycled plastics.
Smart Images
Figure CN223442799U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to single screw extruder especially a cylinder structure of exhaust type single screw extruder. BACKGROUND
[0002] The recycling of plastics has important significance for resource conservation and environmental protection. After recycling, plastics can be processed into new plastic products to achieve the purpose of saving resources. Recycling plastics can reduce environmental pollution and protect the environment. Through the process of crushing, cleaning and granulation, the recycling plastics can be processed into products again. Compared with the production of new plastics, the cost of recycling plastics is lower, which can bring higher benefits to the production enterprises.
[0003] After pretreatment such as classification, crushing, cleaning and dehydration, the fluffy recycling plastics are compressed and transported by a single screw forced side feeder. The recycling plastics are fed into the cylinder of the single screw extruder from the side feeding inlet of the single screw extruder cylinder. The recycling plastics complete the process of transportation, compression, melting, exhaust and extrusion in the cylinder of the single screw extruder. The recycling plastic melt extruded from the head of the single screw extruder is granulated by a granulator to form recycled plastic particles, which can be processed into products again.
[0004] During the process of transportation, compression, melting, exhaust and extrusion of recycling plastics in the cylinder of the single screw extruder, the gas, water vapor and volatile matter generated after heating in the recycling plastics need to be discharged in time, otherwise it will affect the continuous and stable pushing of the feeder. The recycling plastics are easy to stick in the screw groove of the single screw extruder after melting after entering the cylinder, which affects the pushing capacity of the single screw. The cylinder needs to be heated and insulated to ensure that the recycling plastics are in a molten state in the cylinder.
[0005] The cylinder structure of the single screw extruder plays a crucial role in improving the quality and yield of recycled plastics, as well as improving production efficiency and reducing production cost. SUMMARY
[0006] The utility model relates to a cylinder structure of exhaust type single screw extruder, adopt this cylinder structure, can discharge the gas and the water vapor and the volatile matter generated after heating in the recycling plastics in time, guarantee that the recycling plastics are in a molten state in the cylinder, prevent molten recycling plastics from sticking in the screw groove.
[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0008] A barrel structure of a single-screw exhaust extruder, comprising a feeding barrel and an extruding barrel, a flange III at the front end of the feeding barrel is connected with a flange II at the rear end of the extruding barrel;
[0009] A side feeding inlet on the side of the feeding barrel is provided with a side feeding machine connecting flange for connecting with the end face flange of the single-screw forced side feeding machine, the rear upper part of the feeding barrel is provided with a rear exhaust port, the outer wall of the feeding barrel is provided with a cooling water groove, the outer surface of the cooling water groove is covered and sealed by a water groove cover plate, the cooling water groove and the water groove cover plate form a cooling water jacket, the rear lower part of the water groove cover plate is connected with a cooling water inlet, the front upper part of the water groove cover plate is connected with a cooling water outlet, and the rear end of the feeding barrel is provided with a flange IV for connecting with the front end face of the gear reduction box of the single-screw extruder.
[0010] A heater is installed on the barrel wall of the extruding barrel, the outer wall of the extruding barrel is provided with a plurality of thermocouple installation holes, a plurality of thermocouples are respectively installed at the plurality of thermocouple installation holes, the front upper part of the extruding barrel is provided with an exhaust port, and the front end of the extruding barrel is provided with a flange I for connecting with the head of the single-screw extruder.
[0011] Further, the flange III is provided with a plurality of screw holes, the flange II is provided with a plurality of screw through holes II, and a plurality of fastening screws are respectively connected with the screw holes through the screw through holes II to tightly connect the flange III and the flange II.
[0012] Further, the flange III is provided with a groove II, and the flange II is provided with a boss corresponding to the groove II, the groove II and the boss are used for positioning when the flange III and the flange II are connected.
[0013] Further, the flange IV is provided with a groove III for positioning when the flange IV is connected with the front end face of the gear reduction box of the single-screw extruder.
[0014] Further, a vacuum device is installed on the flange of the exhaust port by a screw, and the vacuum device is used for promoting exhaust of the exhaust port.
[0015] Further, the flange I is provided with a groove I for positioning when the flange I is connected with the head of the single-screw extruder.
[0016] Beneficial effects: the barrel structure of the exhaust single screw extruder is composed of a feeding barrel and an extrusion barrel, the single screw of the exhaust single screw extruder can be arranged in the feeding barrel and the extrusion barrel. The fluffy recycled plastic is pushed into the feeding barrel by the single screw forced side feeder through the side feeding inlet of the feeding barrel, the rear upper part of the feeding barrel is provided with a rear exhaust port, the gas in the recycled plastic and the steam generated after heating are discharged from the rear exhaust port, so that the recycled plastic can be continuously and stably pushed into the feeding barrel by the side feeder, in order to prevent the recycled plastic from being adhered to the screw groove of the single screw of the exhaust single screw extruder after entering the feeding barrel due to melting, thereby affecting the pushing capacity of the single screw, a cooling water groove is processed on the outer wall of the feeding barrel, an outer covering water groove cover plate is covered, a cooling water jacket is formed, cooling water is cooled through the cooling water jacket, the recycled plastic entering the feeding barrel will not melt in the feeding barrel, and the pushing force of the single screw on the recycled plastic is ensured. The recycled plastic enters the extrusion barrel under the pushing of the single screw, the extrusion barrel is heated and kept warm by the heater, the recycled plastic completes the process of conveying, compression, melting, exhaust and extrusion in the extrusion barrel, the volatile matters in the melted recycled plastic are efficiently discharged through the vacuum device installed at the exhaust port of the extrusion barrel, and then the recycled plastic is extruded from the head of the exhaust single screw extruder and granulated by the granulator, so that the recycled plastic particles have the performance of being processed into products again. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a front view of the barrel structure of the exhaust single screw extruder.
[0018] Figure 2 It is a top view of the barrel structure of the exhaust single screw extruder.
[0019] Figure 3 It is a sectional view of the extrusion barrel.
[0020] Figure 4 It is Figure 3 the middle A view.
[0021] Figure 5 It is Figure 3 the middle B-B view.
[0022] Figure 6 It is Figure 3 the middle C view.
[0023] Figure 7 It is a sectional view of the feeding barrel.
[0024] Figure 8 It is Figure 7 the middle D-D view.
[0025] Figure 9 It is Figure 7 the middle E-E view.
[0026] Figure: 1- flange I; 2- screw through hole I; 3- extrusion barrel; 4- exhaust port; 5- thermocouple mounting hole; 6- flange II; 7- screw through hole II; 8- screw hole; 9- fastening screw; 10- cooling water outlet; 11- feeding barrel; 12- side feeding inlet; 13- screw through hole III; 14- flange IV; 15- cooling water inlet; 16- flange III; 17- rear exhaust port; 18- side feeding machine connecting flange; 19- groove I; 20- boss; 21- cooling water tank; 22- water tank cover plate; 23- groove II; 24- groove III. DETAILED DESCRIPTION
[0027] The utility model will be explained further in connection with the drawings.
[0028] As Figure 1 , 3 , 7, the barrel structure of the exhaust type single screw extruder, the single screw of the single screw extruder can be arranged in the barrel structure, the barrel structure includes feeding barrel 11 and extrusion barrel 3, the flange III 16 of the front end of feeding barrel 11 is connected with the flange II 6 of the rear end of extrusion barrel 3, a plurality of screw holes 8 are arranged on the flange III 16, a plurality of screw through holes II 7 are arranged on the flange II 6, a plurality of fastening screws 9 are connected with the screw holes 8 through the screw through holes II 7 respectively, and the flange III 16 and the flange II 6 are tightly connected. The flange III 16 is provided with a groove II 23, the flange II 6 is provided with a boss 20 corresponding to the groove II 23, and the groove II 23 and the boss 20 are used for positioning when the flange III 16 and the flange II 6 are connected.
[0029] As Figure 2 , Figures 7 to 9As shown, the side feeding inlet 12 of the feeding cylinder 11 is provided with a side feeder connecting flange 18 for connecting with the end face flange of the single screw forced side feeder. The side feeder connecting flange 18 is connected with the screw hole of the end face flange of the single screw forced side feeder by screws, and the side feeder connecting flange 18 is tightly connected with the end face flange of the single screw forced side feeder. The fluffy recycled plastics are pushed into the feeding cylinder 11 by the single screw forced side feeder through the side feeding inlet 12 of the feeding cylinder 11. The rear part of the upper part of the feeding cylinder 11 is provided with a rear exhaust port 17. The gas in the recycled plastics and the steam generated after the recycled plastics are heated in the extrusion cylinder 3 can be discharged from the rear exhaust port 17. The residual water in the dehydrated recycled plastics can be fully discharged from the rear exhaust port 17, which can prevent the gas blockage of the water vapor in the side feeding inlet 12 of the feeding cylinder 11, so as to facilitate the continuous and stable pushing of the recycled plastics into the feeding cylinder 11 by the side feeder. Meanwhile, the dry recycled plastics are beneficial to the conveying, compression and melting in the extrusion cylinder 3. The outer wall of the feeding cylinder 11 is provided with a cooling water groove 21. The outer surface of the cooling water groove 21 is covered and sealed by a water groove cover plate 22. The cooling water groove 21 and the water groove cover plate 22 form a cooling water jacket. The rear part of the lower part of the water groove cover plate 22 is connected with a cooling water inlet 15, and the front part of the upper part of the water groove cover plate 22 is connected with a cooling water outlet 10. The cooling water enters the cooling water groove 21 from the cooling water inlet 15 and is discharged from the cooling water outlet 10. The cooling water passes through the cooling water jacket to cool the feeding cylinder 11, so that the recycled plastics entering the feeding cylinder 11 will not melt in the feeding cylinder 11, which prevents the melted recycled plastics from being adhered to the screw groove of the single screw of the exhaust type single screw extruder, and ensures the pushing force of the single screw on the recycled plastics. The rear end of the feeding cylinder 11 is provided with a flange IV 14 for connecting with the front end face of the single screw extruder gear reduction box. The flange IV 14 is provided with a plurality of screw through holes III 13. A plurality of screws are connected with the front end face of the single screw extruder gear reduction box through the screw through holes III 13, so as to tightly connect the flange IV 14 with the front end face of the single screw extruder gear reduction box. The flange IV 14 is provided with a groove III 24 for positioning when the flange IV 14 is connected with the front end face of the single screw extruder gear reduction box.
[0030] As Figure 2 , Figures 3 to 6As shown, the recycled plastic enters the extrusion barrel 3 under the action of the single screw, the barrel wall of the extrusion barrel 3 is provided with a heater, the extrusion barrel 3 is heated and kept warm by the heater, the outer wall of the extrusion barrel 3 is provided with a plurality of thermocouple mounting holes 5, a plurality of thermocouples are respectively mounted at the plurality of thermocouple mounting holes 5, the thermocouples measure and adjust the process temperature of the extrusion barrel 3, the recycled plastic is pushed into the extrusion barrel 3 by the single screw, the upper front of the extrusion barrel 3 is provided with an exhaust port 4, the recycled plastic is transported, compressed and melted in the extrusion barrel 3, the volatile components generated by the melted recycled plastic are efficiently discharged by the vacuum device at the exhaust port 4 of the extrusion barrel 3, the melted recycled plastic after discharging the volatile components has properties similar to new plastic processed into products, the vacuum device is installed on the flange of the exhaust port 4 by screws, the vacuum device is used to promote exhaust of the exhaust port 4, the front end of the extrusion barrel 3 is provided with a flange I1 for connecting with the head of the single screw extruder, the flange I1 is provided with a plurality of screw through holes I2, a plurality of screws are respectively connected with the head flange of the exhaust single screw extruder through the screw through holes I2, the flange I1 is tightly connected with the head flange of the exhaust single screw extruder, the flange I1 is provided with a groove I19 for positioning when the flange I1 is connected with the head of the single screw extruder. The melted recycled plastic after devolatilization is extruded from the head of the exhaust single screw extruder and is granulated by a granulator to produce recycled plastic particles, the recycled plastic particles have properties of being processed into products again.
[0031] The barrel structure of the exhaust single screw extruder has the following functions:
[0032] After the recycled plastic is pretreated by classification, crushing, cleaning and dehydration, the fluffy recycled plastic is fed into the feeding barrel 11 from the side feeding inlet 12 of the feeding barrel 11 by the single screw forced side feeder, the fluffy recycled plastic is pushed into the feeding barrel 11 by the single screw forced side feeder through the side feeding inlet 12 of the feeding barrel 11, the gas in the recycled plastic and the steam generated after the recycled plastic is heated in the extrusion barrel 3 are discharged from the rear exhaust port 17, the cooling water enters the cooling water tank 21 from the cooling water inlet 15 and is discharged from the cooling water outlet 10, the cooling water cools the feeding barrel 11 through the cooling water jacket, ensuring the pushing force of the single screw on the recycled plastic, the recycled plastic enters the extrusion barrel 3 under the action of the single screw, the extrusion barrel 3 is heated and kept warm by the heater, the recycled plastic is transported, compressed and melted in the extrusion barrel 3 under the action of the rotation of the single screw, the volatile components in the melted recycled plastic are efficiently discharged by the vacuum device installed at the exhaust port 4 of the extrusion barrel 3, and then the recycled plastic is extruded from the head of the exhaust single screw extruder and is granulated by a granulator, so that the recycled plastic particles have properties of being processed into products again.
[0033] The above merely is preferred implementation manner of the present application, it should be pointed out, for ordinary skilled person in the technical field, on the premise of not departing from the principle of the present application, can also make several improvements and refinements, these improvements and refinements also should be regarded as the protection scope of the present application.
Claims
1. A barrel structure of a venting single-screw extruder, characterized by: It comprises a feeding cylinder (11) and an extrusion cylinder (3), wherein a flange III (16) at the front end of the feeding cylinder (11) is connected to a flange II (6) at the rear end of the extrusion cylinder (3); The side feed inlet (12) on the side of the feeding barrel (11) is provided with a side feeder connecting flange (18) for connecting to the end flange of the single-screw forced side feeder, the upper rear portion of the feeding barrel (11) is provided with a rear exhaust port (17), the outer wall of the feeding barrel (11) is provided with a cooling water trough (21), the outer surface of the cooling water trough (21) is covered and closed by a trough cover (22), the cooling water trough (21) and the trough cover (22) form a cooling water jacket, the lower rear portion of the trough cover (22) is connected to the cooling water inlet (15), the upper front portion of the trough cover (22) is connected to the cooling water outlet (10), and the rear end of the feeding barrel (11) is provided with a flange IV (14) for connecting to the front end face of the gear reducer of the single-screw extruder; A heater is installed on the wall of the extrusion barrel (3), a plurality of thermocouple mounting holes (5) are provided on the outer wall of the extrusion barrel (3), and a plurality of thermocouples are respectively installed at the plurality of thermocouple mounting holes (5). An exhaust port (4) is provided at the front of the upper portion of the extrusion barrel (3), and a flange I (1) is provided at the front end of the extrusion barrel (3) for connecting to the head of the single-screw extruder.
2. The barrel structure of a venting single-screw extruder according to claim 1, characterized in that: The flange III (16) is provided with a plurality of screw holes (8), the flange II (6) is provided with a plurality of screw through holes II (7), and a plurality of fastening screws (9) are connected to the screw holes (8) through the screw through holes II (7) to tightly connect the flange III (16) and the flange II (6).
3. The barrel structure of a venting single-screw extruder according to claim 2, characterized in that: The flange III (16) is provided with a groove II (23), and the flange II (6) is provided with a boss (20) corresponding to the groove II (23). The groove II (23) and the boss (20) are used for positioning when the flange III (16) and the flange II (6) are connected.
4. The barrel structure of a venting single-screw extruder according to claim 1, characterized in that: The flange IV (14) is provided with a groove III (24) for positioning the flange IV (14) when connected to the front end face of the gear reducer of the single-screw extruder.
5. The barrel structure of a venting single-screw extruder according to claim 1, characterized in that: A vacuum device is mounted on the flange of the exhaust port (4) by screws, and the vacuum device is used to promote exhaust from the exhaust port (4).
6. The barrel structure of a venting single-screw extruder according to claim 1, characterized in that: The flange I (1) is provided with a groove I (19) for positioning the flange I (1) when connected to the head of the single-screw extruder.