PP granule double screw feeder for processing plastic products
The design of the twin-screw feeder solves the problems of uneven feeding and material accumulation, achieving efficient and stable conveying and mixing of PP granules, thus improving the processing quality of plastic products and the safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN XINSUYUAN PLASTIC TECH CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-29
AI Technical Summary
Existing feeding equipment has problems such as uneven feeding, low metering accuracy, and output fluctuations in plastic product processing. In particular, single screw feeders are unable to cope with the differences in the flowability of polypropylene granules, resulting in material accumulation and unstable feeding, which affects processing efficiency and product quality.
The design employs a twin-screw structure with gear meshing, along with a mixing rod and protective shell, to ensure that the screws rotate synchronously and in the same direction. This reduces material accumulation, improves mixing uniformity and feeding stability, and protects the gear structure from external contamination through a dustproof plate.
It achieves efficient and stable conveying of PP granules, improves the automation level of feeding equipment and product quality, and ensures the continuity and safety of production.
Smart Images
Figure CN224296289U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic production equipment technology, specifically to a twin-screw feeder for PP granules used in plastic product processing. Background Technology
[0002] With the continuous development of the plastics processing industry, the types of plastics and processing technologies are becoming increasingly diversified. Among them, polypropylene (PP) granules, as a widely used general-purpose plastic raw material, have been widely applied in various molding processes such as injection molding and extrusion. To ensure accurate, stable, and efficient feeding of PP granules during processing, the performance of the feeding equipment is particularly crucial.
[0003] Currently, traditional feeding methods mostly employ single-screw feeders or manual feeding. However, these methods have many shortcomings in practical applications, such as uneven feeding, low metering accuracy, and output fluctuations, affecting the stability of the production process and product quality. Taking a single-screw feeder as an example, its working principle relies on the rotation of the screw to convey materials forward. However, because polypropylene granules have a certain degree of fluidity and may exhibit differences under different working conditions, the single-screw structure is difficult to effectively handle situations with poor material flow or high-load operation, easily causing material accumulation and stagnation, which in turn leads to unstable feeding, affecting subsequent processing efficiency and finished product quality. Therefore, we propose a twin-screw feeder for PP granules in plastic product processing to improve the automation level of plastic processing and product quality. Utility Model Content
[0004] In order to overcome the shortcomings of the prior art, this utility model provides a twin-screw feeder for PP granules in plastic product processing.
[0005] The technical implementation scheme of this utility model is as follows: a twin-screw feeder for PP granules in plastic product processing includes a storage bin fixedly installed on a machine base, the storage bin being the main conveying and feeding body of the feeder; it also includes screws, a support frame, gear one, gear two, a support plate, and a motor. Two screws are symmetrically and rotatably installed at the bottom of the inner wall of the storage bin near the discharge port. The screws are used to synchronously transport plastic raw materials. One end of the two screws is rotatably connected to the inside of the storage bin through the support frame, and the other end of the two screws rotatably passes through the other side wall of the storage bin. Gear one is fixedly installed on the rod of each screw located outside the storage bin. The gear one on the two screws is on the same horizontal plane and does not mesh with each other. Gear two is rotatably connected to the outer wall of the storage bin near the gears. Gear two meshes with gear one on both sides. The two gears one and gear two are distributed in a triangular point. A support plate is fixedly connected to the outside of the storage bin, and a motor is fixedly installed on the support plate. The output shaft of the motor is connected to one of the screws.
[0006] More preferably, a stirring rod is rotatably mounted on the middle of the inner wall of the storage hopper via a bearing. The stirring rod is located directly above the screw, and the stirring rod helps to improve the mixing uniformity between PP granules and other materials that may be added.
[0007] More preferably, the output shaft of the motor is connected to the stirring rod via a belt drive assembly, which is used to fully utilize the power of the motor's output shaft.
[0008] More preferably, the top of the storage silo is an opening for feeding, and a dustproof plate is installed at the top opening of the storage silo by means of a hinge, with the edge of the dustproof plate fitting into the opening at the top of the storage silo.
[0009] More preferably, a protective shell is provided on the outer wall of the storage bin near gear one and gear two, the protective shell covering the periphery of gear one and gear two, the protective shell being used to protect the meshing structure of gear one and gear two.
[0010] More preferably, the storage silo is provided with observation windows on both the front and rear sides of the silo body. The observation windows are made of tempered glass, which allows users to observe the feeding of plastic products in the storage silo.
[0011] Compared with the prior art, the present invention has the following advantages:
[0012] 1. This utility model adopts a twin-screw structure with gear meshing transmission, so that the two screws rotate synchronously and in the same direction, which effectively improves the conveying efficiency of plastic raw materials such as PP granules. In addition, the twin screws working together can reduce the accumulation of materials in dead corners in the bin, ensure smooth flow of raw materials, and improve feeding stability.
[0013] 2. This utility model is equipped with a stirring rod in the storage silo. The stirring rod is connected to the motor output shaft through a belt drive assembly to realize multi-purpose power distribution, improve the energy utilization efficiency of the motor, and fully mix the PP granules and additives to ensure product consistency and quality.
[0014] 3. This utility model can also prevent external dust from entering and contaminating the raw materials by providing a dustproof plate on the top of the hopper, keeping the raw materials clean and meeting the production hygiene requirements. The outer sides of gear one and gear two are provided with protective shells, which not only protect the gears from external damage, but also improve the overall operational safety of the equipment. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0016] Figure 2 This is a cross-sectional view of the internal structure of the storage silo of this utility model.
[0017] Figure 3 This is a schematic diagram of the screw, support frame, gear one, gear two and motor of this utility model.
[0018] Figure 4 This is a schematic diagram of the storage bin, motor, belt drive assembly, and protective shell of this utility model.
[0019] The components in the attached diagram are labeled as follows: 1. Storage bin, 101. Base, 2. Screw, 3. Support frame, 4. Gear 1, 5. Gear 2, 6. Support plate, 7. Motor, 8. Discharge port, 9. Agitator rod, 10. Bearing, 11. Belt drive assembly, 12. Dustproof plate, 13. Hinge, 14. Protective shell, 15. Observation window. Detailed Implementation
[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0021] A twin-screw feeder for PP granules in plastic product processing, such as Figures 1-4 As shown, the device includes a storage bin 1 fixedly installed on the base 101, which serves as the main conveying and feeding body of the feeder; it also includes screws 2, a support frame 3, gear 1 4, gear 2 5, a support plate 6, and a motor 7. Two screws 2 are symmetrically and rotatably installed on the bottom inner wall of the storage bin 1 near the discharge port 8. The screws 2 are used to synchronously transport plastic raw materials. One end of the two screws 2 is rotatably connected to the inside of the storage bin 1 through the support frame 3, and the other end of the two screws 2 rotatably passes through the other side wall of the storage bin 1. Gear 1 4 is fixedly installed on the rod of each screw 2 located outside the storage bin 1. Gear 1 4 on the two screws 2 On the same horizontal plane and not meshing with each other, a gear 5 is rotatably connected to the outer wall of the storage bin 1 near gear 4. Gear 5 meshes with gears 4 on both sides. The two gears 4 and gear 5 are distributed in a triangular position. A support plate 6 is fixedly connected to the outside of the storage bin 1. A motor 7 is fixedly installed on the support plate 6. The output shaft of the motor 7 is connected to one of the screws 2. The motor 7 drives one of the screws 2 to rotate. Through gear 4 meshing with gear 5, the two screws 2 can rotate in the same direction in the storage bin 1 and convey PP granular raw materials, improving the efficiency of raw material feeding and reducing material accumulation and retention.
[0022] like Figure 2As shown, a stirring rod 9 is rotatably mounted on the middle of the inner wall of the storage silo 1 via a bearing 10. The stirring rod 9 is located directly above the screw 2. The stirring rod 9 helps to improve the mixing uniformity between PP granules and other materials that may be added, ensuring the consistency and quality of the final product.
[0023] like Figure 2 As shown, the output shaft of the motor 7 is connected to the stirring rod 9 through the belt drive assembly 11. The belt drive assembly 11 is used to make full use of the power of the output shaft of the motor 7 and improve the energy utilization rate of the feeder during operation.
[0024] like Figure 1 and Figure 2 As shown, the top of the storage silo 1 is the feeding opening. A dustproof plate 12 is hinged to the top opening of the storage silo 1 via a hinge 13. The edge of the dustproof plate 12 is fitted into the top opening of the storage silo 1. The dustproof plate 12 covers the storage silo 1 to prevent dust from entering the storage silo 1 and contaminating the PP granule raw material inside the storage silo 1.
[0025] like Figure 1 and Figure 4 As shown, a protective shell 14 is provided on the outer wall of the storage bin 1 near gear 4 and gear 5. The protective shell 14 covers the periphery of gear 4 and gear 5 and is used to protect the meshing structure of gear 4 and gear 5, thereby improving the safety of gear 4 and gear 5 exposed on the outside.
[0026] like Figure 1 As shown, observation windows 15 are provided on both the front and rear sides of the storage bin 1. The observation windows 15 are made of tempered glass, which allows users to observe the feeding of plastic products in the storage bin 1.
[0027] When using this device, first, add the PP granules (and possible additives) into the opening at the top of the storage silo 1. To prevent dust contamination, cover the opening of the storage silo 1 with a dustproof plate 12 after adding the material, ensuring a tight seal. The user can then monitor the material status and feeding process in real time through the tempered glass observation windows 15 on the front and back sides of the storage silo 1. When the device starts, the motor 7 begins to run. The output shaft of the motor 7 directly drives one of the connected screws 2 to rotate. Gear 4 on this screw 2 meshes with gear 5 installed on the outer wall of the storage silo 1, and gear 5 meshes with gear 4 on the other screw 2. Since the two gears 4 are on the same horizontal plane and do not contact each other, but are indirectly linked through the intermediate gear 5, this ensures that the two screws 2 rotate precisely synchronously and in the same direction within the storage silo 1. Simultaneously with the rotation of the screws 2, to fully utilize the power of the motor 7 and improve the mixing effect... The output shaft of motor 7 also transmits power to the stirring rod 9 through a belt drive assembly 11. The stirring rod 9 is located directly above the screw 2. The rotation of the stirring rod 9 can effectively disperse and premix PP granules and added materials, significantly improving the uniformity of mixing and ensuring the consistency of the final product quality. Under the action of the two twin screws 2 rotating synchronously in the same direction, an efficient material conveying channel is formed. The threads of the screw 2 continuously and stably push and compact the PP granule raw material (premixed by the stirring rod 9) from the feed end to the discharge port 8. The feeding efficiency of PP granule raw material is improved by conveying it in the same direction through the twin screws 2, effectively reducing the accumulation and retention of materials in the dead corner area of the silo, and ensuring the continuity and stability of the feeding process. To ensure the safety of the transmission components, the protective shell 14 covering the gear 1 4 and gear 2 5 effectively isolates the external environment, prevents foreign objects from being drawn in or personnel from touching them, and improves the safety of the exposed gear meshing structure.
[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A twin-screw feeder for PP granules in plastic product processing, comprising a storage bin (1) fixedly installed on a base (101); Its characteristics are, It also includes screws (2), support frame (3), gear one (4), gear two (5), support plate (6), and motor (7). Two screws (2) are symmetrically and rotatably installed at the bottom of the inner wall of the storage silo (1) near the discharge port (8). One end of the two screws (2) is rotatably connected to the inside of the storage silo (1) through the support frame (3). The other end of the two screws (2) rotatably passes through the other side wall of the storage silo (1). Gear one is fixedly installed on the rod body of each screw (2) located outside the storage silo (1). 4) The gears 1 (4) on the two screws (2) are on the same horizontal plane and do not mesh with each other. The outer wall of the storage bin (1) is rotatably connected to the gear 1 (4). The gear 2 (5) meshes with the gears 1 (4) on both sides. The two gears 1 (4) and gear 2 (5) are distributed in a triangular position. The outer side of the storage bin (1) is fixedly connected to the support plate (6). The motor (7) is fixedly installed on the support plate (6). The output shaft of the motor (7) is connected to one of the screws (2).
2. The twin-screw feeder for PP granules in plastic product processing according to claim 1, characterized in that, A stirring rod (9) is rotatably mounted on the middle of the inner wall of the storage bin (1) via a bearing (10), and the stirring rod (9) is located directly above the screw (2).
3. A twin-screw feeder for PP granules in plastic product processing according to claim 2, characterized in that, The output shaft of the motor (7) is connected to the stirring rod (9) via a belt drive assembly (11).
4. A twin-screw feeder for PP granules in plastic product processing according to claim 3, characterized in that, The top of the storage bin (1) is an opening for feeding. A dustproof plate (12) is installed at the top opening of the storage bin (1) by a hinge (13). The edge of the dustproof plate (12) is fitted into the opening at the top of the storage bin (1).
5. A twin-screw feeder for PP granules in plastic product processing according to claim 4, characterized in that, The outer wall of the storage bin (1) is provided with a protective shell (14) near gear one (4) and gear two (5), and the protective shell (14) covers the periphery of gear one (4) and gear two (5).
6. A twin-screw feeder for PP granules in plastic product processing according to claim 5, characterized in that, The storage silo (1) is equipped with observation windows (15) on both the front and rear sides of the silo body.