A high-precision double-screw volumetric micro-transport feeder

Abstract

This utility model relates to the technical field of twin-screw extrusion equipment, specifically disclosing a high-precision twin-screw volumetric micro-feeder, including a base plate, a drive unit, a transmission unit, a material bin, and a feeding device. The drive unit and transmission unit are mounted on the top of the base plate, and the working end of the drive unit is connected to the transmission unit and the feeding device respectively. The feeding device contains twin screws for conveying material, with a center distance of 6-12 mm. A material bin is mounted on the top of the feeding device, and a stirring paddle is installed in the bin. This design uses one drive unit to rotate two slave devices, which can greatly reduce the overall volume of the feeder. The material added to the bin is evenly stirred by the stirring paddle to disperse it, avoiding adhesion or bridging. Then, it is extruded by the tiny twin screws, outputting the material in a more precise and micro-volume manner.

Description

Technical Field

[0001] This utility model relates to the technical field of twin-screw extrusion equipment, and in particular to a high-precision twin-screw volumetric micro-feeder. Background Technology

[0002] A twin-screw extruder consists of several parts, including a drive unit, a feeding unit, a barrel, and screws. After the material is added to the feeding unit, it falls into the twin screws. The drive unit drives the twin screws to rotate, thus conveying the material. During conveying, the barrel is heated and kept warm, facilitating uniform extrusion. High-speed, co-rotating twin-screw extruders can be used for compounding, venting, or as continuous chemical reactors. Currently, most twin-screw extruders are large-scale devices; even small micro-experimental extruders range from one to two meters in length. For the small quantities of materials required for special experiments, the volume occupied by the various structures of the extruder limits the precision of micro-extrusion. Utility Model Content

[0003] The purpose of this invention is to provide a high-precision twin-screw volumetric micro-feeder to solve the problems encountered in the background art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A high-precision twin-screw volumetric micro-feeder includes a base plate, a drive unit, a transmission unit, a material bin, and a feeding device. The drive unit and the transmission unit are mounted on the top of the base plate. The working end of the drive unit is connected to the transmission unit and the feeding device respectively. The feeding device is equipped with a twin-screw for conveying materials, and the center distance between the twin screws is 6-12 mm. A material bin is mounted on the top of the feeding device, and a stirring paddle is installed in the material bin.

[0005] In the above scheme, the driving device includes a motor, a reducer, and a transmission box. The transmission box is mounted on the top of the base plate via a support frame. An input shaft is installed in the transmission box. The motor is connected to the input shaft via the reducer. A drive gear is mounted on the outer periphery of the input shaft. The drive gear is connected to the transmission device and the feeding device respectively. A top cover is installed on the top of the transmission box, and a protective cover is provided on the outer periphery of the base plate to surround the motor and the reducer.

[0006] In the above scheme, the transmission device includes a stirring drive shaft, a bevel gear set, a stirring main shaft, and a stirring shaft. The stirring drive shaft is mounted on a support frame via bearings and is rotatably connected to the support frame placed on the base plate. A stirring driven gear is installed on the outer periphery of the stirring drive shaft, and the stirring driven gear meshes with the driving gear. The working end of the stirring drive shaft meshes with the stirring main shaft via the bevel gear set. The top of the stirring main shaft is fixedly connected to the stirring shaft via a connector. The upper part of the stirring shaft extends into the material box and is connected to the stirring paddle for transmission.

[0007] As a preferred embodiment, the stirring shaft is vertically mounted on a bearing housing via bearings, and the bearing housing is externally fixed to the top side of the base plate by a support plate. The extended end of the stirring shaft avoids the twin screw, and the stirring paddle is fixedly connected to the top of the stirring shaft by fasteners. The stirring paddle has at least two blades, which are located on top of the twin screw when rotating.

[0008] In the above scheme, the material box includes a material tray and a material cylinder. The bottom of the material tray is installed on the outside of the stirring shaft through a sealing element. The stirring shaft and the twin screw are arranged alternately. The outer periphery of the material tray is engaged with the material cylinder. The material cylinder is circular and confines the stirring paddle inside. A cylinder cover is installed on the top of the material cylinder. A powder scraper is also fixed on the top of the stirring paddle.

[0009] In the above scheme, the feeding device includes two driven screw shafts, which are installed in a transmission box. The driven screw shafts are connected to the driving gear via driven gears mounted on their outer circumferences. The working ends of the driven screw shafts are fixedly connected to the twin screws via a connector. A coupling sleeve connected to the end of the twin screws is installed inside the connector. The working ends of the twin screws are equipped with feeding ports that extend to the bottom outer side of the material box. The twin screws include feeding screws, which rotate in the same direction or in opposite directions.

[0010] Compared with existing technologies, the advantages of this invention are as follows: the working end of the drive device is connected to the transmission device and the feeding device respectively, thus using one drive device to drive two subordinate devices to rotate, which can greatly reduce the overall size of the feeder. The transmission device mainly provides power to the stirring paddle, and the micro-feeding device mainly provides power to the twin screw. The material added to the hopper is evenly stirred by the stirring paddle to disperse it and avoid adhesion or bridging. Then, it is extruded by the tiny twin screw, outputting the material in a more precise and minute manner. When acting on the same material, the weight of the material extruded by the twin screw in one rotation is fixed, thus enabling precise output of minute amounts of material, meeting the laboratory's needs for micro-extraction of materials. Attached Figure Description

[0011] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a top view of the structure of this utility model.

[0012] Numbering in the diagram: 1-Base plate; 2-Drive device; 21-Motor; 22-Reducer; 23-Input shaft; 24-Drive gear; 25-Transmission box; 26-Top cover; 27-Guard cover; 3-Transmission device; 31-Agitator drive shaft; 32-Pressure cover; 33-Bevel gear set; 34-Bearing seat; 35-Agitator main shaft; 36-Agitator shaft; 37-Support plate; 38-Agitator driven gear; 4-Materials box; 41-Materials tray; 42-Materials cylinder; 43-Cylinder cover; 5-Agitator paddle; 51-Powder scraper; 6-Feeding device; 61-Connector; 62-Coupling sleeve; 63-Feeding port; 64-Feeding screw; 65-Screw driven shaft; 66-Screw driven gear. Detailed Implementation

[0013] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the utility model will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model, and therefore only show the relevant components of this utility model.

[0014] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] Example 1, such as Figure 1-3 As shown, a high-precision twin-screw volumetric micro-feeder includes a base plate 1, a drive device 2, a transmission device 3, a material box 4, and a feeding device 6. The base plate 1 can be used as the table surface of the workbench or can be installed on the workbench by bolts. Its main function is to support and maintain the flatness of the working environment, so as to facilitate better output of micro-materials.

[0017] The drive device 2 and the transmission device 3 are installed on the top of the base plate 1. The working end of the drive device 2 is connected to the transmission device 3 and the feeding device 6 respectively. Thus, one drive device 2 drives two subordinate devices to rotate, which can greatly reduce the volume of the entire feeder. The transmission device 3 mainly provides the power source for the stirring paddle 5, and the micro device 6 mainly provides the power source for the twin screw.

[0018] The feeding device 6 is internally equipped with a twin-screw conveyor for material transport. The center distance between the twin screws is 6-12 mm, and as a preferred option, the center distance can be designed to be 9 mm, enabling precise micro-volume material transport. A material hopper 4 is mounted on top of the feeding device 6, and a stirring paddle 5 is installed inside the hopper 4. The material added to the hopper 4 is uniformly stirred by the stirring paddle 5 to disperse it, preventing adhesion or bridging. Then, it is extruded by the tiny twin screws, outputting the material in a more precise micro-volume manner.

[0019] When applied to the same material, the weight of the material extruded by the twin screws in one revolution is fixed, thus enabling precise output of trace amounts of material to meet the laboratory's needs for trace material extraction.

[0020] In Example 2, based on the scheme of Example 1, the drive device 2 includes a motor 21, a reducer 22, and a transmission box 25. The motor 21 is a servo motor, which facilitates the control of the rotation speed of the twin screw via the reducer 22, thereby controlling the number of rotations. The transmission box 25 is mounted on the top of the base plate 1 via a support frame, and the support frame and transmission box 25 also provide support for the installation of the motor 21. An input shaft 23 is installed in the transmission box 25, and the motor 21 is connected to the input shaft 23 via the reducer 22, thereby driving the input shaft 23 to rotate under the drive of the motor 21.

[0021] A drive gear 24 is mounted on the outer periphery of the input shaft 23. The drive gear 24 is connected to the transmission device 3 and the feeding device 6 respectively. For the specific connection structure, please refer to Embodiments 3 and 4. A top cover 26 is installed on the top of the transmission box 25. The top cover 26 is detachably installed on the top of the transmission box 25 by screws. By opening the transmission box 25, the drive gear 24 and its meshing parts can be lubricated and maintained.

[0022] In addition, as a preferred embodiment, the outer periphery of the base plate 1 is provided with a protective cover 27 that surrounds the motor 21 and the reducer 22. The protective cover 27 has heat dissipation holes to dissipate heat when the motor 21 is running.

[0023] In Example 3, based on the scheme of Example 2, the transmission device 3 includes a stirring drive shaft 31, a bevel gear set 33, a stirring main shaft 35, and a stirring shaft 36. The two sides of the stirring drive shaft 31 are mounted on a support frame via bearings and are rotatably connected to the support frame placed on the base plate 1. A stirring driven gear 38 is installed on the outer periphery of the stirring drive shaft 31. The stirring driven gear 38 meshes with the driving gear 24. When the motor 21 drives the driving gear 24 to rotate, the stirring driven gear 38 drives the stirring drive shaft 31 to rotate.

[0024] The working end of the stirring drive shaft 31 is connected to the stirring main shaft 35 via a bevel gear set 33. The bevel gear set 33 includes a first bevel gear and a second bevel gear. (See reference...) Figure 1 As shown, the first bevel gear is fixed to the stirring drive shaft 31, and the second bevel gear is fixed to the stirring main shaft 35. Due to the meshing of the first and second bevel gears, the horizontal transmission torque is converted into the vertical transmission torque. The top of the stirring main shaft 35 is fixedly connected to the stirring shaft 36 through a connector. The upper and lower sides of the stirring main shaft 35 are also mounted in the bearing housing 34 through bearings. The upper part of the stirring shaft 36 extends into the material box 4 and is connected to the stirring paddle 5 for transmission. Thus, under the drive of the stirring main shaft 35, the stirring paddle 5 is ultimately driven to rotate, thereby uniformly stirring the material.

[0025] When the stirring shaft 35 is vertically mounted on the bearing housing 34 via bearings, a bevel gear adjusting shim can be installed to raise the position of the stirring shaft 35 to match its installation height. The bearing housing 34 is externally fixed to the top side of the base plate 1 by a support plate 37, which provides support for the bearing housing 34.

[0026] As a preferred embodiment, the protruding end of the stirring shaft 36 avoids the twin screws, and the stirring paddle 5 is fixedly connected to the top of the stirring shaft 36 by fasteners. Please refer to [link / reference]. Figure 3 The mixing paddle 5 is equipped with at least two blades. When the blades rotate, they are located at the top of the twin screw. When the blades rotate, they push the material to the middle of the twin screw, which facilitates the micro-transport of the twin screw.

[0027] In this embodiment, the material box 4 includes a material tray 41 and a material cylinder 42. The bottom of the material tray 41 is installed on the outside of the stirring shaft 36 via a sealing element. The stirring shaft 36 and the twin screw are arranged alternately. The sealing element is a sealing sleeve, which is installed not only on the outside of the stirring shaft 36 but also on the outside of the stirring main shaft 35. The outer periphery of the material tray 41 is engaged with the material cylinder 42 using a concave-convex fitting structure. The material cylinder 42 is circular, confining the stirring paddle 5 inside, and can rotate freely. A cylinder cover 43 is installed on the top of the material cylinder 42. The cylinder cover 43 is closed during operation to prevent external contamination and is usually covered. The cylinder cover 43 is only opened when adding material.

[0028] In addition, as a preferred embodiment, a scraper 51 is fixed to the top of the stirring paddle 5. The scraper 51 has a V-shaped structure and its bottom is provided with a mounting plane for locking the scraper 51 to the top axis of the stirring paddle 5 with screws. When the stirring paddle 5 rotates, it drives the scraper 51 to rotate synchronously. In this way, when the material is put into the material box 4, the scraper 51 at the top can vertically break up the powdery material to prevent it from bridging and clumping, while the stirring paddle 5 at the bottom rotates synchronously to stir the material. The interaction between the two provides uniform mixing conditions for the precise output of the material, meeting the laboratory requirements for the conveying of trace materials.

[0029] During the synchronous rotation of the mixing paddle 5 and the scraper 51, the material is uniformly mixed under the dual vertical pressure of the feeding screw 64 in the conveying direction, and the filling degree of the two closely spaced feeding screws 64 is consistent, thereby improving the material conveying accuracy. The material is finally discharged from the feed port 63 of the extrusion equipment in a volumetric micro-volume manner.

[0030] Example 4, based on the solution of Example 2, please refer to... Figure 3 The feeding device 6 includes two driven screw shafts 65, which are installed in the transmission box 25. Each driven screw shaft 65 is connected to the driving gear 24 via a driven screw gear 66 mounted on its outer periphery. During installation, one driven screw shaft 65 is engaged with the driving gear 24, and a first gear is mounted on this shaft. The other driven screw shaft 65 is equipped with a second gear. The first and second gears mesh, so that when the driving gear 24 drives the driven screw shaft 65 with the first gear to rotate, it also drives the other driven screw shaft 65 with the second gear to rotate synchronously. The gear ratio of the first and second gears when engaged is 1:1, facilitating synchronous rotation.

[0031] The working end of the driven screw shaft 65 is fixedly connected to the twin screws via a connector 61. When the driven screw shaft 65 rotates, it drives the twin screws to rotate, precisely conveying the material. As a preferred embodiment, a coupling sleeve 62, which connects to the end of the twin screws, is installed inside the connector 61 to ensure a stable connection. A feed port 63 is installed at the working end of the twin screws, extending to the bottom outer side of the material box 4. After being pushed by the twin screws, the material is discharged from the feed port 63, where a collection tray is placed to collect the material.

[0032] Furthermore, the twin-screw extruder includes two feeding screws 64. These two screws 64 can rotate in the same direction or in opposite directions during operation, as long as they can uniformly convey the material. Co-rotation includes clockwise and counterclockwise rotation, primarily used in experiments such as plastic modification and rubber compounding, where strong shearing and uniform mixing are required. Counterclockwise rotation, where one feeding screw 64 rotates clockwise and the other counterclockwise, offers high conveying efficiency and is used in experiments with highly filled or heat-sensitive materials.

[0033] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. These undisclosed elements are all prior art known to those skilled in the art.

[0034] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-precision twin-screw volumetric micro-feeder, characterized in that: It includes a base plate (1), a drive device (2), a transmission device (3), a material box (4) and a feeding device (6). The drive device (2) and the transmission device (3) are installed on the top of the base plate (1). The working end of the drive device (2) is connected to the transmission device (3) and the feeding device (6) respectively. The feeding device (6) is equipped with a twin screw for conveying materials. The center distance between the twin screws is 6-12 mm. The top of the feeding device (6) is equipped with a material box (4) and a stirring paddle (5) is installed in the material box (4).

2. The high-precision twin-screw volumetric micro-feeder according to claim 1, characterized in that: The drive device (2) includes a motor (21), a reducer (22), and a transmission box (25). The transmission box (25) is mounted on the top of the base plate (1) by a support frame. An input shaft (23) is installed in the transmission box (25). The motor (21) is connected to the input shaft (23) through the reducer (22). A drive gear (24) is installed on the outer periphery of the input shaft (23). The drive gear (24) is connected to the transmission device (3) and the feeding device (6) respectively.

3. A high-precision twin-screw volumetric micro-feeder according to claim 2, characterized in that: The top of the transmission box (25) is equipped with a top cover (26), and the outer periphery of the bottom plate (1) is provided with a protective cover (27) that surrounds the motor (21) and the reducer (22).

4. A high-precision twin-screw volumetric micro-feeder according to claim 2, characterized in that: The transmission device (3) includes a stirring drive shaft (31), a bevel gear set (33), a stirring main shaft (35), and a stirring shaft (36). The stirring drive shaft (31) is mounted on a support frame via bearings and is rotatably connected to the support frame placed on the base plate (1). A stirring passive gear (38) is installed on the outer periphery of the stirring drive shaft (31). The stirring passive gear (38) meshes with the driving gear (24). The working end of the stirring drive shaft (31) meshes with the stirring main shaft (35) via the bevel gear set (33). The top of the stirring main shaft (35) is fixedly connected to the stirring shaft (36) via a connector. The upper part of the stirring shaft (36) extends into the material box (4) and is connected to the stirring paddle (5) via transmission.

5. A high-precision twin-screw volumetric micro-feeder according to claim 4, characterized in that: The stirring spindle (35) is vertically mounted on the bearing seat (34) via a bearing, and the outside of the bearing seat (34) is fixed to the top side of the base plate (1) by a support plate (37).

6. A high-precision twin-screw volumetric micro-feeder according to claim 4, characterized in that: The extended end of the stirring shaft (36) avoids the twin screw. The stirring paddle (5) is fixedly connected to the top of the stirring shaft (36) by fasteners. The stirring paddle (5) has at least two blades, which are located at the top of the twin screw when rotating.

7. A high-precision twin-screw volumetric micro-feeder according to claim 4, characterized in that: The material box (4) includes a material tray (41) and a material cylinder (42). The bottom of the material tray (41) is installed on the outside of the stirring shaft (36) by a sealing element. The stirring shaft (36) is staggered with the twin screw. The outer periphery of the material tray (41) is engaged with the material cylinder (42). The material cylinder (42) is circular and confines the stirring paddle (5) inside. A cylinder cover (43) is installed on the top of the material cylinder (42). A powder scraper (51) is also fixed on the top of the stirring paddle (5).

8. A high-precision twin-screw volumetric micro-feeder according to claim 2, characterized in that: The feeding device (6) includes a screw passive shaft (65), which has two shafts and is installed in the transmission box (25). The screw passive shaft (65) is connected to the drive gear (24) through a screw passive gear (66) installed on the outer periphery. The working end of the screw passive shaft (65) is fixedly connected to the twin screws through a connector (61).

9. A high-precision twin-screw volumetric micro-feeder according to claim 8, characterized in that: The connector (61) is equipped with a coupling sleeve (62) that is connected to the end of the twin screw. The working end of the twin screw is equipped with a feeding port (63), which extends to the bottom outside of the material box (4).

10. A high-precision twin-screw volumetric micro-feeder according to claim 8, characterized in that: The twin screw includes two feed screws (64) that rotate in the same direction or in opposite directions.

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