Viscous powder feeding device of extruder and extruder
By arranging a polygonal stirring roller with differential rotation and a sticky powder feeding device with a servo motor to adjust the speed on the extruder, the problem of sticky powder bridging at the feed port is solved, achieving stable feeding and efficient production.
Patent Information
- Application Number
- CN202511109564.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-08
- Publication Date
- 2025-09-26
AI Technical Summary
When using a loss-in-weight feeder to extrude sticky food-grade powders, the raw materials tend to accumulate and form bridges above the barrel inlet, resulting in poor material conveying and affecting processing stability and efficiency.
The first and second stirring rollers, which rotate at a relative differential speed and are arranged above the feed port of the extruder barrel, force the sticky powder to be pushed through the polygonal structure and differential rotation. The servo motor adjusts the speed to achieve continuous and stable feeding, and the heat transfer is prevented by the heat insulation plate.
It effectively solves the problem of bridging and blocking of sticky powder at the feed port, ensuring the stability and production efficiency of food processing. It also has a compact structure and is easy to install and maintain.
Smart Images
Figure CN120697290A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of extruders, in particular to an extruder viscous powder feeding device and an extruder. Background Art
[0002] At present, when extruders require stable, controllable, continuous raw material delivery and precise metering, loss-in-weight feeders are usually used to feed the extruders. The raw materials are conveyed through the loss-in-weight feed screw, naturally fall from the blanking port to the extruder barrel inlet, and then heated and extruded through the extruder barrel screw.
[0003] Under the above feeding process, when using an extruder to mix and extrude viscous food-grade powder, the following problems may occur:
[0004] During the extruder production process, the speed of the raw materials conveyed by the loss-in-weight scale will change in order to meet the changing demand for the extrusion output of sticky powders. When the speed of the raw materials conveyed by the loss-in-weight scale is too fast, the raw materials are likely to accumulate and form bridges above the barrel inlet, resulting in the material not being able to be conveyed into the barrel through the screw in time. This problem limits the extruder's extrusion output, affects processing stability, and reduces processing quality. Cleaning the bridged and agglomerated materials requires interrupting production, affecting production efficiency.
[0005] Therefore, it is necessary to solve the above technical problems. Summary of the Invention
[0006] In response to the above technical problems, the present invention provides an extruder viscous powder feeding device and an extruder, which can continuously and stably feed viscous food-grade powder and conveniently adjust the feeding speed; effectively solve the technical problem of bridging and blockage of viscous powder at the feed port, and ensure the stability and production efficiency of food processing.
[0007] To achieve the above object, the technical solution of the present invention is:
[0008] A viscous powder feeding device for an extruder is arranged above a feed port of an extruder barrel, and comprises a first stirring roller and a second stirring roller which rotate at a relative differential speed, wherein the first stirring roller and the second stirring roller have polygonal shapes;
[0009] The sticky powder falls from above between the first stirring roller and the second stirring roller, and the sticky powder is forced to be transported downward from the middle of the rollers to the barrel feed port through the relative rotation of the two rollers.
[0010] This extruder's viscous powder feeding device uses the differential relative rotation of the first and second stirring rollers to force sticky powder trapped between them downward toward the barrel feed port. This differential rotation enhances the shearing and pushing capabilities of high-viscosity powders, reducing adhesion. The two stirring rollers are polygonal in shape, and their edges scrape the surface of the other roller during rotation, achieving a self-cleaning function and preventing powder from sticking and clumping. This feeding device enables continuous and stable feeding of viscous food-grade powders, effectively resolving the technical challenge of sticky powder bridging and blockage at the feed port, ensuring food processing stability and production efficiency.
[0011] A further optimized solution further includes a gear box, wherein a first stirring shaft extending outward from the gear box is fixedly connected to the first stirring roller, and a second stirring shaft is fixedly connected to the second stirring roller;
[0012] The gear box is provided with a first stirring gear connected to the first stirring shaft, and a second stirring gear connected to the second stirring shaft. The number of teeth of the first stirring gear and the second stirring gear are unequal, so that the first stirring roller and the second stirring roller rotate at a differential speed.
[0013] The first stirring roller and the second stirring roller are driven to rotate by the gear transmission in the gear box, ensuring the stability of the rotational motion and that both have sufficient thrust to push the sticky powder. Differential rotation can be achieved by setting different numbers of teeth on the first stirring gear and the second stirring gear. The structure is simple, reliable and easy to implement.
[0014] In a further optimized solution, the gear ratio of the first stirring gear to the second stirring gear is 15:17. The gear ratio of the first stirring gear to the second stirring gear of 15:17 is a preferred embodiment.
[0015] In a further optimized solution, the first stirring roller and the second stirring roller are respectively hexagonal in shape. The hexagonal structure of the first stirring roller and the second stirring roller is a preferred embodiment, and of course they can also be quadrilateral, pentagon, heptagon or octagon.
[0016] A further optimized solution also includes a driving mechanism, which is connected to the gear box through a reducer and drives it to rotate.
[0017] In a further optimized solution, the driving mechanism is a servo motor. The servo motor can flexibly adjust the output speed through the control system, thereby adjusting the feeding speed to meet the needs of different extrusion outputs.
[0018] A further optimization solution also includes a heat shield installed below the first and second stirring rollers to block heat transfer from the barrel feed port. The heat shield is installed between the feeding device and the barrel feed port to prevent heat transfer from the barrel to the feeding device, preventing the powder from sticking due to increased viscosity caused by heat, while also protecting components such as the servo motor from high temperatures.
[0019] An extruder comprises any one of the above-mentioned viscous powder feeding devices for the extruder.
[0020] A further optimized solution further includes a loss-in-weight scale and an extruder barrel, wherein the feed port of the loss-in-weight scale is located directly above the middle of the first stirring roller and the second stirring roller, and the barrel feed port is located on the extruder barrel;
[0021] The extruder viscous powder feeding device transports the viscous powder falling from the dropout port of the loss-in-weight scale downward from the middle of the pair of rollers to the barrel feed port; an extruder screw is provided in the extruder barrel to continue transporting the viscous powder.
[0022] The extruder viscous powder feeding device and the extruder of the present invention have the following technical advantages compared with the prior art:
[0023] 1. Solve the bridging problem: Through the forced pushing and self-cleaning functions of two polygonal stirring rollers with different speeds, high-viscosity powder can be effectively prevented from accumulating and bridging at the feed inlet, ensuring continuous material transportation;
[0024] 2. Improve stability and efficiency: The servo motor can adjust the feeding speed in a wide range to adapt to changes in production; there is no need to frequently stop the machine to clean up lumps, which significantly improves production stability and efficiency;
[0025] 3. Structural optimization: The compact structural design saves installation space; the heat insulation board protects the equipment and prevents the powder from sticking due to heat, ensuring stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a perspective view of a specific embodiment of the viscous powder feeding device for an extruder of the present invention;
[0027] Figure 2 yes Figure 1 Another perspective stereogram;
[0028] Figure 3 yes Figure 1 The main view;
[0029] Figure 4 yes Figure 3 A top view of
[0030] Figure 5 yes Figure 3 AA cross-sectional view;
[0031] Figure 6 yes Figure 4 BB cross-sectional view;
[0032] Figure 7 yes Figure 1 Internal view of the gearbox;
[0033] Figure 8 It is an application Figure 1 A perspective view of the extruder with feeding device;
[0034] Figure 9 yes Figure 8 The main view;
[0035] Figure 10 yes Figure 9 CC cross-sectional view;
[0036] Figure 11 yes Figure 10 Middle D is a partial enlarged view.
[0037] In the figure: first stirring roller 1, second stirring roller 2, gear box 3, first stirring shaft 4, second stirring shaft 5, first stirring gear 6, second stirring gear 7, drive mechanism 8, speed reducer 9, heat shield 10, stirring roller mounting base 11, cylindrical roller bearing 12, pressure rotary shaft seal 13;
[0038] Extruder viscous powder feeding device 100, loss-in-weight scale 200, extruder barrel 300, barrel feed port 310, extruder screw 400. DETAILED DESCRIPTION
[0039] The present invention will be described in further detail below with reference to the embodiments in the accompanying drawings.
[0040] like Figures 1 to 7 As shown in FIG, a specific embodiment of the extruder viscous powder feeding device of the present invention is shown. Figures 8 to 11 As shown, application Figure 1 A specific embodiment of the extruder of the extruder viscous powder feeding device.
[0041] like Figure 1 、 Figure 4 and Figure 6 As shown, the extruder viscous powder feeding device 100 of this embodiment is arranged above the extruder barrel feed port 310 ( Figure 11 As shown in the figure, the mixing roller comprises a first stirring roller 1 and a second stirring roller 2 which rotate at a relative differential speed, and the first stirring roller 1 and the second stirring roller 2 have polygonal shapes; the sticky powder falls from above between the first stirring roller 1 and the second stirring roller 2, and through the relative rotation of the two, the sticky powder is forced to be transported downward from the middle of the pair of rollers to the barrel feed port 310.
[0042] like Figure 1 and Figure 6 As shown, the first and second stirring rollers 1 and 2 are mounted on a stirring roller mounting base 11, each connected to a cylindrical roller bearing 12 at the front and rear ends. The first and second stirring rollers 1 and 2 rotate relative to each other on these cylindrical roller bearings 12. Cylindrical roller bearings 12 are sealed with food-grade pressure rotary seals 13 to prevent lubricant contamination of the material. Other parts that come into contact with the material are made of SUS304, meeting food-grade material processing requirements.
[0043] This extruder's viscous powder feeding device uses the differential relative rotation of the first and second stirring rollers to force sticky powder trapped between them downward toward the barrel feed port. This differential rotation enhances the shearing and pushing capabilities of high-viscosity powders, reducing adhesion. The two stirring rollers are polygonal in shape, and their edges scrape the surface of the other roller during rotation, achieving a self-cleaning function and preventing powder from sticking and clumping. This feeding device enables continuous and stable feeding of viscous food-grade powders, effectively resolving the technical challenge of sticky powder bridging and blockage at the feed port, ensuring food processing stability and production efficiency.
[0044] like Figure 2 、 Figure 5 and Figure 7 As shown, the extruder viscous powder feeding device further includes a gear box 3 , a first stirring shaft 4 extending outward from the gear box 3 is fixedly connected to the first stirring roller 1 , and a second stirring shaft 5 is fixedly connected to the second stirring roller 2 .
[0045] like Figure 5 、 Figure 6 and Figure 7 As shown, a first stirring gear 6 is provided in the gear box 3 to connect to the first stirring shaft 4, and a second stirring gear 7 is connected to the second stirring shaft 5. The number of teeth of the first stirring gear 6 and the second stirring gear 7 are not equal, so that the first stirring roller 1 and the second stirring roller 2 rotate at a differential speed.
[0046] like Figure 1 As shown, the gear box 3 is connected to the stirring roller mounting base 11. The gear box 3 is completely sealed and is refueled using an oiling nozzle to prevent lubricating oil from leaking to the external environment.
[0047] The first stirring roller 1 and the second stirring roller 2 are driven to rotate by the gear transmission in the gear box 3, ensuring the stability of the rotational motion and that both have sufficient thrust to push the sticky powder. Differential rotation can be achieved by setting different numbers of teeth on the first stirring gear 6 and the second stirring gear 7. The structure is simple, reliable and easy to implement.
[0048] The gear ratio of the first stirring gear 6 to the second stirring gear 7 is 15:17. The gear ratio of the first stirring gear 6 to the second stirring gear 7 is 15:17, which is a preferred embodiment. Figure 7 As shown, the first stirring gear 6 has 15 teeth, and the second stirring gear 7 has 17 teeth.
[0049] like Figure 6 As shown, the first stirring roller 1 and the second stirring roller 2 are hexagonal in shape. The hexagonal structure of the first stirring roller 1 and the second stirring roller 2 is a preferred embodiment, and they can also be quadrilateral, pentagon, heptagon or octagon.
[0050] like Figure 1 and Figure 2 As shown, the extruder viscous powder feeding device also includes a drive mechanism 8, which is connected to the gearbox 3 via a reducer 9 and drives the gearbox 3 to rotate. Drive mechanism 8 is a servo motor. The servo motor can flexibly adjust the output speed through the control system, thereby adjusting the feeding speed to meet the needs of different extrusion outputs.
[0051] like Figure 1 、 Figure 2 and Figure 3 As shown, the extruder viscous powder feeding device also includes a heat shield 10, which is installed below the first and second stirring rollers 1, 2 to block heat transfer from the barrel feed port 310. The heat shield 10 is installed between the feeding device and the barrel feed port 310 to prevent heat from being transferred from the barrel to the feeding device, preventing the powder from sticking due to increased viscosity due to heat, and protecting components such as the servo motor from high temperatures.
[0052] The heat insulation board 10 is made of polyetheretherketone (PEEK), which has good mechanical properties, high melting point and chemical corrosion resistance. Figure 2 As shown, the heat insulation plate 10 is installed at the bottom of the gear box 3 and the stirring roller mounting base 11.
[0053] The present invention further discloses an extruder, comprising the above-mentioned viscous powder feeding device 100 for the extruder.
[0054] like Figures 8 to 11 As shown, the extruder further includes a loss-in-weight scale 200 and an extruder barrel 300 . The feed port of the loss-in-weight scale 200 is located directly above the middle of the first stirring roller 1 and the second stirring roller 2 , and the barrel feed port 310 is located on the extruder barrel 300 .
[0055] The extruder viscous powder feeding device 100 transports the viscous powder falling from the discharge port of the loss-in-weight scale 200 downward from the middle of the rollers to the barrel feed port 310; the extruder screw 400 is provided in the extruder barrel 300 to continue transporting the viscous powder.
[0056] The extruder viscous powder feeding device and the extruder can continuously and stably feed viscous food-grade powder, and can conveniently adjust the feeding speed; effectively solve the technical problem of bridging and blocking of the feed port by viscous powder, and ensure the stability and production efficiency of food processing.
[0057] In summary, the present invention, as described in the specification and illustrations, has been manufactured into actual samples and tested multiple times. The test results show that the invention can achieve its intended purpose and its practicality is beyond doubt. The above embodiments are only used to facilitate the description of the content of the invention and are not intended to be formally limited thereto. Any equivalent embodiment made by a person with common knowledge in the relevant technical field and making partial changes or modifications to the technical content disclosed in the invention without departing from the scope of the technical features and similar features of the present invention, falls within the scope of protection of the present invention.
Claims
1. A viscous powder feeding device for an extruder, characterized by: The feeding device is arranged above the feed port (310) of the extruder barrel, and comprises a first stirring roller (1) and a second stirring roller (2) which rotate at a relative differential speed, wherein the first stirring roller (1) and the second stirring roller (2) have polygonal shapes; The sticky powder falls from above between the first stirring roller (1) and the second stirring roller (2), and through the relative rotation of the two, the sticky powder is forcibly transported downward from the middle of the rollers to the barrel feed port (310).
2. The extruder viscous powder feeding device according to claim 1, characterized in that: It also includes a gear box (3), wherein the gear box (3) extends outwardly to a first stirring shaft (4) fixedly connected to the first stirring roller (1), and a second stirring shaft (5) fixedly connected to the second stirring roller (2); The gear box (3) is provided with a first stirring gear (6) connected to the first stirring shaft (4), and a second stirring gear (7) connected to the second stirring shaft (5). The number of teeth of the first stirring gear (6) and the second stirring gear (7) are unequal, so that the first stirring roller (1) and the second stirring roller (2) rotate at a differential speed.
3. The extruder viscous powder feeding device according to claim 2, characterized in that: The gear ratio of the first stirring gear (6) to the second stirring gear (7) is 15:
17.
4. The extruder viscous powder feeding device according to claim 1, characterized in that: The first stirring roller (1) and the second stirring roller (2) are both hexagonal in shape.
5. The extruder viscous powder feeding device according to claim 2, characterized in that: It also includes a driving mechanism (8), which is connected to the gear box (3) through a speed reducer (9) and drives the gear box (3) to rotate.
6. The extruder viscous powder feeding device according to claim 5, characterized in that: The driving mechanism (8) is a servo motor.
7. The extruder viscous powder feeding device according to claim 1, characterized in that: It also includes a heat insulation plate (10), which is arranged at the lower part of the first stirring roller (1) and the second stirring roller (2) to block the heat transfer of the barrel feed port (310).
8. An extruder, characterized in that: The invention comprises the viscous powder feeding device for an extruder according to any one of claims 1 to 7.
9. The extruder according to claim 8, wherein: It also includes a loss-in-weight scale (200) and an extruder barrel (300), wherein the feed port of the loss-in-weight scale (200) is located directly above the middle of the first stirring roller (1) and the second stirring roller (2), and the barrel feed port (310) is located on the extruder barrel (300); The extruder viscous powder feeding device transports the viscous powder falling from the discharge port of the loss-in-weight scale (200) downward from the middle of the pair of rollers to the barrel feed port (310); an extruder screw (400) is provided in the extruder barrel (300) to continue transporting the viscous powder.