Side feeder configuration for single screw extruders
By designing a side feeder structure suitable for single-screw extruders, the problem of feeding loose, crushed plastics was solved, and the stability and efficiency of the recycled granulation process were improved. The properties of the produced plastic granules are close to those of virgin materials, meeting relevant regulations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING GIANT MACHINERY
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-07
AI Technical Summary
Traditional feeding methods are difficult to effectively feed loose, crushed plastics of different shapes and sizes into a single-screw extruder, resulting in unstable recycling and granulation processes and low production efficiency.
A side feeder structure for a single-screw extruder was designed, including a feeder base, a storage tank, single-stage and double-stage cycloidal pinwheel reducers, a barrel, a cooling barrel, and a single feeding screw. It is composed of a sprocket drive mechanism and a bearing housing to ensure stable conveying and cooling of crushed plastic. Antioxidants are added to improve the performance of plastic pellets.
This process improves the stability and production efficiency of the recycling and granulation process for loose, crushed plastics. The properties of the produced plastic granules are close to those of virgin materials, meeting relevant regulatory requirements. The process is simple to operate and increases the yield and quality of recycled plastics.
Smart Images
Figure CN224465212U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to extruders, and more particularly to a side feeder structure for a single screw extruder. Background Technology
[0002] With the increasing consumption of plastic products, the amount of waste plastic is also constantly increasing. Recycled plastic refers to different forms of plastic that still have recycling value after the product's service life has ended. Recycled plastic refers to plastic products that have lost their usability and can be recycled and reused. Currently, the market value of waste plastic applications is also increasing significantly with the rise in the price of plastic raw materials. The price of relatively pure recycled plastic is approaching the price of raw materials before the price increase. With increasingly stringent environmental protection and sustainable development requirements for the plastics industry, waste plastic recycling and processing is constantly developing and growing as an emerging industry. Waste plastic recycling and processing has made a significant contribution to resource recycling and environmental protection, and is an important part of the environmental protection industry.
[0003] Waste plastics are the main source of recycled plastics. Waste plastic products are collected, crushed, washed, dehydrated, and dried before being fed into a single-screw extruder for melting, or with the addition of antioxidants, followed by melt extrusion granulation. This produces plastic granules with properties similar to or slightly inferior to virgin materials, and whose processing performance meets relevant regulations. Products made from these granules can be reused. Because crushed waste plastics are irregular in shape and size, traditional feeding methods make it difficult to feed the loose, crushed plastic into the single-screw extruder. Therefore, designing a side-feeder structure for a single-screw extruder suitable for loose, crushed plastics of different shapes and sizes is a crucial step in improving the stability and production efficiency of the recycled plastic granulation process. Summary of the Invention
[0004] Purpose of the utility model: This utility model provides a side feeder structure for a single screw extruder suitable for crushing loose plastics of different shapes and sizes.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a side feeder structure for a single screw extruder, including a feeder base, a storage tank and a single-stage cycloidal pinwheel reducer are arranged on the feeder base, and a barrel and a double-stage cycloidal pinwheel reducer are arranged on the lower side of the storage tank;
[0006] The output shaft of the single-stage cycloidal pinwheel reducer is connected to the tail end of the drive shaft composed of bearing housings via a sprocket transmission mechanism. The feed inlet at the top of the barrel is connected to the opening on one side of the bottom of the storage tank. The rear end of the barrel is connected to the bearing housings. The front end of the barrel is connected to the rear end of the cooling barrel. The front end of the cooling barrel is connected to the side feed port of the single-screw extruder. The cooling barrel is equipped with a water jacket, which has inlet and outlet water interfaces for connecting to external cooling circulating water. The feeding single screw is installed inside the barrel and the cooling barrel. The tail end of the feeding single screw is connected to the front end of the drive shaft composed of bearing housings. Inside the storage tank, near the bottom, stirring blades and stirring paddles are respectively arranged from top to bottom. The stirring blades and stirring paddles are fixed on the connecting shaft. The lower end of the connecting shaft is connected to the output shaft of the double-stage cycloidal pinwheel reducer.
[0007] Furthermore, several adjusting shims are installed at the bottom of the feeder base, and multiple support columns are connected to the upper part of the feeder base. The top of the support columns is connected to the bottom of the storage tank. The reducer mounting plate is fixed to the upper part of the feeder base by a support screw, and the single-stage cycloidal pinwheel reducer is fixedly installed on the upper part of the reducer mounting plate.
[0008] Furthermore, the sprocket drive mechanism includes a driving sprocket, a driven sprocket, and a chain. The output shaft end of the single-stage cycloidal pinwheel reducer is connected to the driving sprocket via a flat key. The driving sprocket is fixedly installed at the output shaft end of the single-stage cycloidal pinwheel reducer via a sprocket cover A. The driving sprocket is connected to the driven sprocket via a chain. The tail end of the drive shaft is connected to the driven sprocket via a flat key. The driven sprocket is fixedly installed at the tail end of the drive shaft via a sprocket cover B.
[0009] Furthermore, an antioxidant inlet is provided at the upper front end of the barrel.
[0010] Furthermore, the bearing housing comprises a bearing housing body, with a connecting flange at the front end of the bearing housing body. The connecting flange is fastened to the rear flange of the barrel by screws through the flange screw mounting holes. The drive shaft is mounted in the bearing housing body by two single-row tapered roller bearings and a one-way thrust ball bearing. The two single-row tapered roller bearings are respectively mounted at the front end of the drive shaft, and the one-way thrust ball bearing is mounted at the rear end of the drive shaft.
[0011] Furthermore, the drive shaft is provided with two stop screw mounting holes for mounting stop screws that connect to the tail end of the feed screw.
[0012] Furthermore, two oil cups are provided above the bearing housing for injecting lubricating grease into the single-direction thrust ball bearing and the single-row tapered roller bearing respectively located in the bearing housing.
[0013] Furthermore, the front end face of the connecting flange is fixed with a front cover by screws. The front cover is used to fix the single-row tapered roller bearing. An oil seal is installed inside the front cover to seal the lubricating grease at the single-row tapered roller bearing.
[0014] Furthermore, the rear end face of the bearing housing is fixed with a screw and a rear cover is installed. The rear cover is used to fix the one-way thrust ball bearing, and a sealing ring is installed inside the rear cover to seal the lubricating grease at the one-way thrust ball bearing.
[0015] Beneficial Effects: The side-feeder structure of a single-screw extruder is used in production lines for recycling and granulating recycled plastics after collection, crushing, washing, dehydration, and drying. It effectively improves the stability and production efficiency of the recycling and granulation process for loose, crushed plastics of different shapes and sizes. During the feeding process, an appropriate amount of antioxidant can be added to the recycled plastic. After melt extrusion and granulation of the recycled plastic in the single-screw extruder, plastic granules with properties similar to or slightly inferior to virgin material are obtained, and their processing performance meets relevant regulations. Products made from these granules can be reused. The feeding is stable, the structure is simple, and the operation is convenient, significantly improving the yield and quality of recycled plastics. Attached Figure Description
[0016] Figure 1 This is a front view of the side feeder structure of a single-screw extruder.
[0017] Figure 2 This is a side view of the side feeder structure of a single-screw extruder.
[0018] Figure 3 This is a top view of the side feeder structure of a single-screw extruder.
[0019] Figure 4 The main view shows the bearing housing assembly.
[0020] Figure 5 Side view of the bearing housing assembly.
[0021] Figure 6 for Figure 4 View from AA.
[0022] In the diagram: 1- Storage tank; 2- Agitator blade; 3- Agitator paddle; 4- Bearing housing assembly; 5- Driven sprocket; 6- Sprocket cover B; 7- Chain; 8- Drive sprocket; 9- Sprocket cover A; 10- Reducer mounting plate; 11- Feeder base; 12- Single-stage cycloidal pinwheel reducer; 13- Feeding single screw; 14- Cooling barrel; 15- Barrel; 16- Double-stage cycloidal pinwheel reducer; 17- Support column; 18- Adjusting shims; 19- Support screw; 20- Antioxidant inlet; 21- Drive shaft; 22- Rear cover; 23- Oil cup; 24- Connecting flange; 25- Bearing housing; 26- Front cover; 27- Oil seal; 28- Single row tapered roller bearing; 29- Single screw connection hole; 30- Locking screw mounting hole; 31- One-way thrust ball bearing; 32- Seal ring; 33- Flange screw mounting hole; 34- Opening. Detailed Implementation
[0023] The present invention will be further explained below with reference to the accompanying drawings.
[0024] like Figures 1 to 3 As shown, the side feeder structure of a single-screw extruder according to this utility model includes a feeder base 11, a storage tank 1, a stirring paddle 3 and stirring blades 2, a double-stage cycloidal pinwheel reducer 16, a bearing housing assembly 4, a barrel 15, a cooling barrel 14, a feeding single screw 13, a single-stage cycloidal pinwheel reducer 12, and a sprocket drive mechanism. The storage tank 1 and the single-stage cycloidal pinwheel reducer 12 are mounted on the feeder base 11, while the barrel 15 and the double-stage cycloidal pinwheel reducer 16 are mounted below the storage tank 1.
[0025] Several adjusting shims 18 are installed at the bottom of the feeder base 11 to adjust the stability and level of the side feeder structure of the single screw extruder. Four pillars 17 are connected to the upper part of the feeder base 11. The top of the pillars 17 is connected to the bottom of the storage tank 1 to support the storage tank 1. The reducer mounting plate 10 is fixed to the upper part of the feeder base 11 by the support screw 19. The single-stage cycloidal pinwheel reducer 12 is fixedly installed on the upper part of the reducer mounting plate 10.
[0026] The output shaft of the single-stage cycloidal pinwheel reducer 12 is connected to the tail end of the transmission shaft 21 of the bearing housing 4 through a sprocket transmission mechanism. The sprocket transmission mechanism includes a driving sprocket 8, a driven sprocket 5, and a chain 7. The output shaft end of the single-stage cycloidal pinwheel reducer 12 is connected to the driving sprocket 8 through a flat key. The driving sprocket 8 is fixedly installed on the output shaft end of the single-stage cycloidal pinwheel reducer 12 through a sprocket cover A9. The driving sprocket 8 is connected to the driven sprocket 5 through the chain 7. The output shaft end of the single-stage cycloidal pinwheel reducer 12 drives the driving sprocket 8 to rotate. The driving sprocket 8 drives the driven sprocket 5 to rotate through the chain 7. The tail end of the transmission shaft 21 is connected to the driven sprocket 5 through a flat key. The sprocket cover B6 fixes the driven sprocket 5 on the tail end of the transmission shaft 21. The rotation of the driven sprocket 5 drives the transmission shaft 21 to rotate.
[0027] The feed inlet at the top of the barrel 15 is connected to the opening 34 on one side of the bottom of the storage tank 1 via a flange. The rear flange of the barrel 15 is connected to the connecting flange 24 of the bearing housing assembly 4. An antioxidant feed inlet 20 is provided at the upper front of the barrel 15. A corresponding antioxidant feeder adds an appropriate proportion of antioxidant to the crushed plastic through the antioxidant feed inlet 20 of the barrel 15. The antioxidant can improve the performance of the recycled plastic pellets. The front flange of the barrel 15 is connected to the rear flange of the cooling barrel 14. The front end of the cooling barrel 14 is connected to the side feed inlet of the single screw extruder. The barrel 14 is equipped with a water jacket, which has inlet and outlet water interfaces for connecting external cooling circulating water. The external circulating cooling water in the water jacket of the cooling barrel 14 can prevent the compressed crushed plastic from melting and blocking in the cooling barrel 14 due to heat generated by compression and friction before entering the side feed port of the single screw extruder, thus improving the stability of the side feeder conveying crushed plastic. The feeding single screw 13 is installed in the barrel 15 and the cooling barrel 14. The tail end of the feeding single screw 13 is connected to the single screw connection hole 29 at the front end of the drive shaft 21 of the bearing housing assembly 4.
[0028] like Figures 4 to 6As shown, the bearing housing assembly 4 includes a bearing housing body 25. A connecting flange 24 is provided at the front end of the bearing housing body 25. The connecting flange 24 is fastened to the rear flange of the barrel 15 by screws through flange screw mounting holes 33. The drive shaft 21 is supported and limited within the bearing housing body 25 by two single-row tapered roller bearings 28 and a one-way thrust ball bearing 31. The two single-row tapered roller bearings 28 are respectively installed at the front end of the drive shaft 21, bearing the radial and axial forces of the drive shaft 21. The one-way thrust ball bearing 31 is installed at the rear end of the drive shaft 21, bearing the rearward axial thrust of the drive shaft 21. The drive shaft 21 has two stop screw mounting holes 30 for installing stop screws at the tail end of the feeding screw 13, which restrict the forward and backward displacement of the feeding screw 13 within the barrel 15 and the cooling barrel 14. Two oil cups 23 are provided above the bearing housing 25 for injecting lubricating grease into the single-direction thrust ball bearing 31 and the single-row tapered roller bearing 28 respectively located in the bearing housing 25. A front cover 26 is fixed to the front end face of the connecting flange 24 by screws. The front cover 26 is used to fix the single-row tapered roller bearing 28, and an oil seal 27 is installed inside the front cover 26 to seal the lubricating grease at the single-row tapered roller bearing 28. A rear cover 22 is fixed to the rear end face of the bearing housing 25 by screws. The rear cover 22 is used to fix the single-direction thrust ball bearing 31, and a sealing ring 32 is installed inside the rear cover 22 to seal the lubricating grease at the single-direction thrust ball bearing 31.
[0029] After being crushed, washed, dehydrated and dried, the recycled plastic is added to a large-volume storage tank 1. Inside the storage tank 1, near the bottom, there are stirring blades 2 and stirring paddles 3 arranged from top to bottom. The stirring blades 2 and stirring paddles 3 are fixed on a connecting shaft. The lower end of the connecting shaft is connected to the output shaft of a double-stage cycloidal pinwheel reducer 16. The end flange of the double-stage cycloidal pinwheel reducer 16 is connected to the bottom of the storage tank 1. The output shaft of the double-stage cycloidal pinwheel reducer 16 is connected to the stirring paddle 3 and the stirring blade 2 via corresponding connecting shafts. The stirring paddle 3 is positioned below the stirring blade 2. The output shaft of the double-stage cycloidal pinwheel reducer 16 drives the stirring paddle 3 and the stirring blade 2 to rotate synchronously via corresponding connecting shafts. The stirring blade 2 can prevent the loose, crushed plastic from being suspended in the storage tank 1. The stirring paddle 3 pushes the crushed plastic at the bottom of the storage tank 1 through the opening 34 at the bottom of the storage tank 1 into the feed port at the top of the barrel 15, ensuring that the loose, crushed plastic enters the barrel 15 stably. The feeding single screw 13 rotates in the barrel 15 and the cooling barrel 14, gradually compressing the loose, crushed plastic before feeding it into the side feed port of the single screw extruder, thereby improving the stability and production efficiency of the single screw extruder's recycled plastic granulation process.
[0030] The side feeder structure and function of a single-screw extruder are as follows:
[0031] After being crushed, washed, and dehydrated, the recycled plastic is added to a large-volume storage tank 1. A two-stage cycloidal pinwheel reducer 16 drives the stirring blades 2 and 3 to rotate within the storage tank 1. The stirring blades 2 prevent the loose, crushed plastic from being suspended in the storage tank 1, while the 3 continuously and stably pushes the crushed plastic from the bottom of the storage tank 1 into the feed inlet of the barrel 15. A single-stage cycloidal pinwheel reducer 12 drives the drive shaft 21 to rotate via the driving sprocket 8, chain 7, and driven sprocket 5. The drive shaft 21 then drives the feeding screw 13 to rotate. The feeding single screw 13 forces the crushed plastic into the side feed port of the single screw extruder through the barrel 1 and the cooling barrel 14. At the same time, in order to improve the performance of recycled plastic pellets, an appropriate proportion of antioxidant is added to the crushed plastic through the antioxidant inlet 20 of the barrel 15. The water jacket of the cooling barrel 14 is connected to external circulating cooling water. The external circulating cooling water can cool the crushed plastic that is heated by compression and friction to prevent the crushed plastic from melting and clogging in the cooling barrel 14, thereby improving the continuous stability of the side feeder in conveying crushed plastic.
[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A side feeder structure for a single-screw extruder, characterized in that: Includes a feeder base (11), a storage tank (1) and a single-stage cycloidal pinwheel reducer (12) are provided on the feeder base (11), and a machine barrel (15) and a double-stage cycloidal pinwheel reducer (16) are provided on the lower side of the storage tank (1). The output shaft of the single-stage cycloidal pinwheel reducer (12) is connected to the tail end of the drive shaft (21) of the bearing housing assembly (4) via a sprocket transmission mechanism. The feed inlet at the top of the barrel (15) is connected to the opening (34) on one side of the bottom of the storage tank (1). The rear end of the barrel (15) is connected to the bearing housing assembly (4). The front end of the barrel (15) is connected to the rear end of the cooling barrel (14). The front end of the cooling barrel (14) is connected to the side feed port of the single screw extruder. The cooling barrel (14) is equipped with a water jacket. The water jacket is equipped with... The inlet and outlet interfaces of the external cooling circulating water are connected; the feeding single screw (13) is installed in the barrel (15) and the cooling barrel (14). The tail end of the feeding single screw (13) is connected to the front end of the drive shaft (21) of the bearing seat (4). The stirring blade (2) and stirring paddle (3) are respectively set from top to bottom in the storage tank (1) near the bottom. The stirring blade (2) and stirring paddle (3) are fixed on the connecting shaft. The lower end of the connecting shaft is connected to the output shaft of the double-stage cycloidal pinwheel reducer (16).
2. The side feeder structure of a single-screw extruder according to claim 1, characterized in that: Several adjusting pads (18) are installed at the bottom of the feeder base (11), and multiple support columns (17) are connected to the upper part of the feeder base (11). The top of the support columns (17) is connected to the bottom of the storage tank (1). The reducer mounting plate (10) is installed and fixed on the upper part of the feeder base (11) by the support screw (19), and the single-stage cycloidal pinwheel reducer (12) is fixedly installed on the upper part of the reducer mounting plate (10).
3. The side feeder structure of a single-screw extruder according to claim 1, characterized in that: The sprocket drive mechanism includes a driving sprocket (8), a driven sprocket (5), and a chain (7). The output shaft end of the single-stage cycloidal pinwheel reducer (12) is connected to the driving sprocket (8) via a flat key. The driving sprocket (8) is fixedly installed at the output shaft end of the single-stage cycloidal pinwheel reducer (12) via a sprocket cover A (9). The driving sprocket (8) is connected to the driven sprocket (5) via the chain (7). The tail end of the drive shaft (21) is connected to the driven sprocket (5) via a flat key. The driven sprocket (5) is fixedly installed at the tail end of the drive shaft (21) via a sprocket cover B (6).
4. The side feeder structure of a single-screw extruder according to claim 1, characterized in that: The upper front end of the barrel (15) is provided with an antioxidant inlet (20).
5. The side feeder structure of a single-screw extruder according to claim 1, characterized in that: The bearing housing assembly (4) includes a bearing housing body (25), a connecting flange (24) is provided at the front end of the bearing housing body (25), the connecting flange (24) is fastened to the rear flange of the barrel (15) by screws through the flange screw mounting hole (33), the drive shaft (21) is installed in the bearing housing body (25) by two single-row tapered roller bearings (28) and one-way thrust ball bearing (31), the two single-row tapered roller bearings (28) are respectively installed at the front end of the drive shaft (21), and the one-way thrust ball bearing (31) is installed at the rear end of the drive shaft (21).
6. The side feeder structure of a single-screw extruder according to claim 5, characterized in that: The drive shaft (21) is provided with two stop screw mounting holes (30) for installing stop screws that connect to the tail end of the feed screw (13).
7. The side feeder structure of a single-screw extruder according to claim 5, characterized in that: Two oil cups (23) are provided above the bearing housing (25) for injecting lubricating grease into the single-direction thrust ball bearing (31) and the single-row tapered roller bearing (28) respectively located in the bearing housing (25).
8. The side feeder structure of a single-screw extruder according to claim 7, characterized in that: The front end face of the connecting flange (24) is fixed with a front cover (26) by screws. The front cover (26) is used to fix the single-row tapered roller bearing (28). An oil seal (27) is installed inside the front cover (26) to seal the lubricating grease at the single-row tapered roller bearing (28).
9. The side feeder structure of a single-screw extruder according to claim 7, characterized in that: The rear end face of the bearing housing (25) is fixed with a rear cover (22) by screws. The rear cover (22) is used to fix the one-way thrust ball bearing (31). A sealing ring (32) is installed inside the rear cover (22) to seal the lubricating grease at the one-way thrust ball bearing (31).