Double-screw forced feeding device
The twin-screw forced feeding device drives the twin-screw rotation through a planetary reducer, solving the problem of powder material adhesion on the screw wall, achieving rapid and even delivery and efficient feeding, improving the quality of the finished product and reducing maintenance costs.
Patent Information
- Application Number
- CN202422489289.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In the prior art, powdered materials tend to adhere to the screw wall, resulting in uneven mixing of materials and poor delivery, especially in micro-feeding conditions that affect the quality of finished products.
The twin screw forced feeding device is adopted to drive the twin screws to rotate through a planetary reducer. The screws are close to each other but do not engage, preventing material accumulation, and using gravity and screw rotation to push and disperse the material, achieving rapid and even transportation.
Effectively prevent materials from accumulating on the screw wall, achieve rapid and even feeding, reduce the risk of equipment damage, apply different types of materials, reduce maintenance costs, and improve the quality of finished products.
Smart Images
Figure CN223186966U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of material conveying, and particularly relates to a double-screw forced feeding device. Background Technique
[0002] Before the extrusion mixing operation, usually a feeder conveys materials into an aggregate hopper, and various materials enter the barrel of the extruder by gravity. However, due to their own characteristics, some materials are very difficult to evenly and effectively fall into the barrel of the extruder from the feeder. The materials are prone to bridging in the feeding hole wall of the barrel, resulting in uneven mixing of the materials and seriously affecting the quality of the finished product. In order to prevent bridging, the prior art is to vertically install a single-blade screw above the extruder for feeding to solve the problem of material bridging. However, due to the limitations of the single-screw structure, the materials cannot be quickly and effectively conveyed into the barrel. Especially, some powder materials are relatively sticky and prone to caking by themselves. The materials will adhere to the screw wall and accumulate more and more. The materials cannot be conveyed in time and effectively, affecting the formula ratio and unable to achieve the expected effect. This situation is more obvious under the condition of micro-feeding. Therefore, how to prevent the powder materials from accumulating in the screw wall and quickly convey the materials is an urgent problem to be solved. Content of the Utility Model
[0003] The problem to be solved is to provide a solution to prevent powder from adhering to the screw wall and quickly and timely convey the materials.
[0004] To achieve the above object, the utility model provides the following technical scheme: A double-screw forced feeding device includes a motor. The output end of the motor is connected to a planetary reducer. The output end of the planetary reducer is connected to a conveying structure through a transmission structure. The conveying structure includes a connecting body, an aggregate hopper, and a double screw penetrating through the connecting body and the aggregate hopper. The double screw includes two screws. The transmission structure drives the screws to rotate. The screws are rotationally matched with both the connecting body and the aggregate hopper. The two screws are close to each other but not meshed. The connecting body is provided with a feeding port, and the feeding port is communicated with the double screw. One end of the aggregate hopper is a discharging port, and the discharging port is communicated with downstream equipment. Exhaust ports are provided on both the connecting body and the aggregate hopper.
[0005] Preferably, the transmission structure includes a box body, an output shaft gear, and two gears. The output shaft gear and the two gears are arranged in the box body. The upper end of the output shaft gear is connected to the output end of the planetary reducer, and the lower end of the output shaft gear is in transmission connection with the two gears respectively. The two gears are respectively fixed at the tops of the two screws.
[0006] Preferably, the connecting body includes an upper end face, a lower end face, and a middle part. The top of the screw sequentially penetrates through the lower end face, the middle part, and the upper end face and then is connected to the gear.
[0007] Preferably, the upper end face of the screw rod and the connecting body are rotationally connected through an oil seal. The part of the screw rod located inside the box body is successively sleeved with a gear, a limiting sleeve, and a bearing from top to bottom. The two gears corresponding to the two screw rods are arranged vertically staggered.
[0008] Preferably, the lower end face has the same area as the upper end face of the aggregate hopper and the two are detachably connected. A number of supports are provided between the upper end face and the lower end face, and the supports penetrate through the upper end of the aggregate hopper.
[0009] Preferably, a breather cap is further provided at the upper end of the aggregate hopper.
[0010] Compared with the prior art, the present utility model provides a double-screw forced feeding device, which has the following beneficial effects: 1. The feeding screw rod of the double-screw forced feeding structure is vertically installed. The significant advantage of this structure is that the double screw rods can better prevent the problem of material accumulation on the screw rod walls and complete feeding quickly and evenly; the screw rod is directly fixed on the gear, eliminating the phenomenon that the screw rod may fall into the extruder barrel during the process of conveying materials, resulting in damage to the extruder equipment.
[0011] 2. The feeding device is small in volume, compact in structure, and convenient to operate, and can be applied to different types of materials; the applicable feeding amount range is wide, and it can convey materials with a small feeding amount (0.3 - 6 KG / h).
[0012] 3. When maintaining and overhauling, it is convenient to clean the materials. Just disassemble the box body and the connecting body to clean the screw rod.
[0013] 4. It not only solves the problem of material bridging during the conveying process, but can also efficiently and accurately continuously convey materials into the extruder, avoiding the problem of unqualified finished products in the subsequent process due to mistakes in the forced feeding link, effectively saving materials, and reducing the customer's use cost and subsequent maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a schematic structural diagram of the present utility model;
[0015] Figure 2 is a schematic sectional view of the present utility model;
[0016] Figure 3 is a schematic sectional view of the box body part of the present utility model;
[0017] Description of the reference numerals in the drawings: 1. Motor; 2. Planetary reducer; 3. Box body; 4. Connecting body; 41. Feed inlet; 42. Lower end face; 43. Middle part; 44. Upper end face; 5. Support; 6. Aggregate hopper; 61. Discharge outlet; 7. Breather cap; 8. Screw rod; 9. Gear; 91. Retaining ring; 10. Bearing; 11. Oil seal; 12. Limiting sleeve; 13. O-ring; 14. Output shaft gear; 15. Extruder barrel. Detailed implementation manners
[0018] The technical solutions in the embodiments of the present utility model will be described below in conjunction with the accompanying drawings in the embodiments of the present utility model:
[0019] As shown in the figure, to solve the problems in the background technology, the present utility model proposes a double-screw forced feeding device, which includes a motor 1. The output end of the motor 1 is connected to a planetary reducer 2. The output end of the planetary reducer 2 is connected to a conveying structure through a transmission structure. The transmission structure transmits the kinetic energy of the motor 1 to the conveying structure. The conveying structure includes a connecting body 4, a collecting hopper 6, and a double screw penetrating through the connecting body 4 and the collecting hopper 6. The double screw includes two screws 8. The transmission structure drives the screws 8 to rotate. The screws 8 are rotationally matched with respect to the connecting body 4 and the collecting hopper 6. The two screws 8 are close to each other but not meshed, so as to ensure that their respective rotations are not interfered by each other and when there is a tendency of material accumulation, the mutual rotation between the two screws 8 causes the material to fall; the connecting body 4 is provided with a feed inlet 41, a lower end face 42, a middle part 43, and an upper end face 44. There are several supports 5 between the upper end face 44 and the lower end face 42. Generally, four supports 5 are provided. The feed inlet 41 is communicated with the double screw; the collecting hopper 6 is in an inverted cone shape, and the lower end face 42 and the upper end area of the collecting hopper 6 are the same and they are detachably connected. The support 5 can penetrate the upper end of the collecting hopper 6, so that the whole device is more firm. One end of the collecting hopper 6 is an outlet 61, and the outlet 61 is communicated with the downstream equipment. In the illustrated example, the downstream equipment is an extruder. The material flowing out of the outlet 61 enters the barrel 15 of the extruder. Exhaust ports are provided on both the connecting body 4 and the collecting hopper 6. A breather cap 7 is further provided at the upper end of the collecting hopper 6. The breather cap 7 and the exhaust port balance the internal and external air pressures, and at the same time prevent the powdery material from splashing upward and affecting the operation of the transmission structure. The transmission structure includes a box body 3, an output shaft gear 14, and two gears 9. The output shaft gear 14 and the two gears 9 are arranged in the box body 3. The upper end of the output shaft gear 14 is connected to the output end of the planetary reducer 2. The lower end of the output shaft gear 14 is in transmission connection with the two gears 9 respectively. The two gears 9 are respectively fixed at the tops of the two screws 8; the top of the screw 8 sequentially penetrates through the lower end face 42, the middle part 43, and the upper end face 44 and then is connected to the gear 9. The screw 8 is rotationally connected with the upper end face 44 of the connecting body 4 through a oil seal 11. The part of the screw 8 located in the box body 3 is sleeved with a gear 9, a limit sleeve 12, and a bearing 10 from top to bottom in sequence. The two gears 9 corresponding to the two screws 8 are arranged vertically staggered, and the upper end of the gear 9 is fixed by a retaining ring 91.
[0020] In use, first install the aggregate hopper 6 on the barrel 15 of the extruder, fix the connecting body 4 on the aggregate hopper 6, fix the box body 3 on the connecting body 4, and the bottom ends of the two screws 8 sequentially penetrate the connecting body 4 and the aggregate hopper 6 starting from the upper end face 44. Install the bracket 5 between the connecting body 4 and the aggregate hopper 6; the part of the screw 8 that is higher than the upper end face 44 is arranged inside the box body 3. Sleeve the bearing 10, the limit sleeve 12, and the gear 9 in sequence on the part of the screw 8 that is higher than the upper end face 44. The gear 9 meshes with the output shaft gear 14, and a retaining ring 91 is tightened above the gear 9 at the top of the screw 8; finally, close the box body 3 and install the motor 1 and the planetary reducer 2. The aggregate hopper 6 is installed on the barrel of the extruder, and the aggregate hopper 6 is in an inverted conical shape to facilitate the rapid falling of materials. The overall layout of the equipment is compact and the operation is smooth. The feed inlet 41 is used to receive the materials conveyed by the upstream equipment. The two blade screws 8 penetrate the screw cavities of the connecting body 4 and the aggregate hopper 6 in parallel. The inner ring of the bearing 10 is fixed to the shaft end of the screw 8, and the outer ring is installed in the box body 3. The upper end face 44 of the connecting body 4 supports the outer ring of the bearing 10, thereby realizing the rotation of the screw 8 relative to the connecting body 4. The O-ring 13 is fixed between the connecting body 4 and the box body 3. The two gears 9 are installed in a staggered manner and simultaneously mesh with the output shaft gear 14. The motor 1 drives the planetary reducer 2, the output shaft gear 14 is connected to the planetary reducer 2, the planetary reducer 2 drives the output shaft gear 14, the output shaft gear 14 drives the two gears 9, and the gears 9 respectively drive the screws 8 installed on them. The twin screws rotate to convey the materials to the barrel 15 of the extruder. The materials enter the screw cavity of the connecting body 4 from the feed inlet 41, and the materials drop in the screw cavity due to the action of gravity or the rotation of the screws. Even when conveying materials with strong adhesion such as powders, since the two screws 8 are close to each other but rotate independently without interference, when there is a tendency of material accumulation in one of the screws 8, when the blade of the other screw 8 rotates to the accumulation point, it will push and disperse the accumulated materials and carry them down; when there is a tendency of accumulation in both screws 8, then the two screws 8 push and disperse each other to destroy the accumulation tendency of each other. Practice has proved that the conveying structure of the twin screws can better solve the problem of material accumulation than the single screw.
[0021] The above embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
Claims
1. A twin-screw forced feeding device, comprising a motor (1), the output end of the motor (1) being connected to a planetary reducer (2), characterized in that: The output end of the planetary reducer (2) is connected to the conveying structure through a transmission structure. The conveying structure includes a connector (4), a collecting hopper (6) and a twin screw that runs through the connector (4) and the collecting hopper (6). The twin screw includes two screws (8). The transmission structure drives the screw (8) to rotate. The screw (8) and the connector (4) and the collecting hopper (6) are all rotated in coordination. The two screws (8) are close to each other but do not mesh. A feed port (41) is provided on the connector (4). The feed port (41) is connected to the twin screws. One end of the collecting hopper (6) is a discharge port (61). The discharge port (61) is connected to downstream equipment. An exhaust port is provided on the connector (4) and the collecting hopper (6).
2. The twin-screw forced feeding device according to claim 1, characterized in that: The transmission structure comprises a housing (3), an output shaft gear (14) and two gears (9). The output shaft gear (14) and the two gears (9) are arranged in the housing (3). The upper end of the output shaft gear (14) is connected to the output end of the planetary reducer (2). The lower end of the output shaft gear (14) is transmission-connected to the two gears (9). The two gears (9) are respectively fixed to the top ends of the two screw rods (8).
3. The twin-screw forced feeding device according to claim 2, characterized in that: The connecting body (4) comprises an upper end surface (44), a lower end surface (42), and a middle portion (43). The top of the screw (8) passes through the lower end surface (42), the middle portion (43), and the upper end surface (44) in sequence and is connected to the gear (9).
4. The twin-screw forced feeding device according to claim 3, characterized in that: The screw (8) is connected to the upper end surface (44) of the connector (4) in a sealed rotational manner via an oil seal (11). The portion of the screw (8) located within the housing (3) is sleeved with a gear (9), a limiting sleeve (12), and a bearing (10) in sequence from top to bottom. The two gears (9) corresponding to the two screws (8) are arranged in an alternating manner.
5. The twin-screw forced feeding device according to claim 4, characterized in that: The lower end surface (42) has the same area as the upper end of the collecting hopper (6) and the two are detachably connected. A plurality of brackets (5) are provided between the upper end surface (44) and the lower end surface (42), and the brackets (5) pass through the upper end of the collecting hopper (6).
6. The twin-screw forced feeding device according to claim 5, characterized in that: The upper end of the collecting hopper (6) is also provided with a breathable cap (7).