Integrated stirring screw rod structure for extruder

Abstract

The utility model provides an integrated stirring screw rod structure for an extruder. The integrated stirring screw rod structure is characterized in that an extrusion head is arranged at the bottom of a mixing bin body; the stirring and extruding assembly comprises a driving part arranged above the material mixing bin body, the driving part drives a conveying part arranged in the material mixing bin body, a stirring paddle is arranged on the side wall of the conveying part, and the stirring paddle comprises a first stirring rod set integrally formed on the conveying part and a second stirring rod set arranged on the conveying part and located below the first stirring rod set; the first stirring rod set comprises first stirring rods symmetrically arranged on the two side walls of the first spiral auger, first horizontal sections of the first stirring rods and first inclined sections integrally bent downwards with the first horizontal sections, and the second stirring rod set comprises second stirring rods symmetrically arranged on the two side walls of the conveying part and perpendicular to the arrangement direction of the first horizontal sections. And the second stirring rod comprises a second horizontal section and a second inclined section which is integrally formed by bending downwards with the second horizontal section, so that the problem that the mixing bin body hides dirt can be effectively prevented.

Description

Technical Field

[0001] This utility model relates to an integrated stirring screw structure for an extruder, which is applied in the field of 3D printing. Background Technology

[0002] Clay or concrete 3D printers integrate traditional ceramic or concrete art with modern 3D printing technology, enabling the digitization and automation of the production process. This 3D printer integrates raw material mixing and printing extrusion functions, allowing for direct mixing of materials inside the printer followed by immediate printing, avoiding time wasted waiting for mixing or transferring materials. However, existing extruder mixing structures are complex, often accumulating dirt and grime in the mixing rod area, making cleaning difficult, and their manufacturing processes are relatively complex and costly. Therefore, to address these issues, this invention designs an integrated mixing screw structure for extruders. Utility Model Content

[0003] This invention provides an integrated stirring screw structure for extruders, which can effectively solve the above-mentioned problems.

[0004] This utility model is implemented as follows:

[0005] An integrated stirring screw structure for an extruder, comprising:

[0006] The mixing chamber has an extrusion head at the bottom.

[0007] A mixing extrusion assembly includes a drive unit disposed on the side of a mixing chamber, the drive unit driving a conveyor disposed within the mixing chamber. A mixing paddle is disposed on the side wall of the conveyor. The mixing paddle includes a first mixing rod assembly integrally formed on the conveyor, and a second mixing rod assembly disposed on the conveyor below the first mixing rod assembly. The first mixing rod assembly includes first mixing rods symmetrically disposed on both sides of a first auger, a first horizontal section of the first mixing rod, and a first inclined section integrally bent downwards with the first horizontal section. The second mixing rod assembly includes second mixing rods symmetrically disposed on both sides of the conveyor and perpendicular to the direction of the first horizontal section. The second mixing rod includes a second horizontal section and a second inclined section integrally bent downwards with the second horizontal section. The length of the first horizontal section is longer than the length of the second horizontal section.

[0008] As a further improvement, the angle between the first horizontal segment and the first inclined segment is α = 63 to 68°.

[0009] As a further improvement, the angle between the second horizontal segment and the second inclined segment is β = 70 to 75°.

[0010] As a further improvement, the conveying component is a spiral auger assembly, which includes a first spiral auger connected to the drive component, a second bearing sleeved on the sidewall of the first spiral auger, the first spiral auger being connected to a second spiral auger, and the second spiral auger extending to the bottom of the extruder head.

[0011] As a further improvement, the pitch of the first auger is greater than that of the second auger, and the blade diameter of the first auger is greater than that of the second auger.

[0012] As a further improvement, a placement groove is provided at the bottom of the first spiral auger, a clutch bearing is provided in the placement groove, and a second spiral auger is provided in the clutch bearing.

[0013] As a further improvement, the clutch bearing includes an inner ring and an outer ring that rotates relative to the inner ring. The outer ring abuts against a placement groove. The inner ring is fitted with a second spiral auger. There is a receiving cavity between the inner ring and the outer ring. A retainer is provided in the receiving cavity. Several inclined wedges are provided on the retainer. The wedges are limited and fixed by a ring spring surrounding the middle of the wedges. The length of the wedges is defined as L, and the width of the receiving cavity is defined as W. Then L > W.

[0014] The beneficial effects of this utility model are:

[0015] (1) The first stirring rod assembly includes a first stirring rod symmetrically arranged on both sides of the first spiral auger, a first horizontal section of the first stirring rod and a first inclined section integrally bent downwards with the first horizontal section. The second stirring rod assembly includes a second stirring rod symmetrically arranged on both sides of the conveying component and perpendicular to the direction of the first horizontal section. The second stirring rod includes a second horizontal section and a second inclined section integrally bent downwards with the second horizontal section. The length of the first horizontal section is longer than the length of the second horizontal section. This utility model can achieve the function of uniformly stirring materials by using the integrally formed first stirring rod assembly and second stirring rod assembly. The structure is simple and practical. It can effectively prevent the problem of dirt and grime accumulation and difficulty in cleaning. Moreover, the cross-section of the mixing chamber is conical, so that the stirring rod can be adapted to the shape of the mixing chamber.

[0016] (2) The angle between the first horizontal section and the first inclined section is α = 63-68°, and the angle between the second horizontal section and the second inclined section is β = 70-75°. Since there is a large space above the mixing silo and it is the material inlet, a large stirring force is required to ensure that the material is fully mixed. Therefore, the angle between the first horizontal section and the first inclined section is relatively small, which makes the bending amplitude of the first inclined section larger, thereby improving the stirring efficiency in the horizontal direction and thus fully mixing the material. The angle between the second horizontal section and the second inclined section is relatively large, which makes the bending amplitude of the second inclined section smaller, thus making its longitudinal unblocking ability stronger and effectively preventing the bottom blockage problem of the mixing silo. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model.

[0019] Figures 2-3 This is an exploded structural diagram provided in an embodiment of the present invention.

[0020] Figure 4 This is a front view provided in an embodiment of the present utility model.

[0021] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure at point AA.

[0022] Figure 6 This is a top view structural diagram of the mixing silo provided in this embodiment of the utility model.

[0023] Figure 7 This is a schematic diagram of the cross-sectional structure of the clutch bearing provided in an embodiment of this utility model.

[0024] The attached diagram is labeled as follows:

[0025] 10. Mixing hopper; 11. Extruder head; 12. Mounting frame; 121. Feed chute; 122. Mounting hole; 13. Feed port;

[0026] 20. Stirring and extrusion assembly; 21. Drive motor; 211. Reducer; 22. First bearing; 23. Spiral auger assembly; 231. First spiral auger; 2311. Placement groove; 232. Second spiral auger; 24. Second bearing; 25. Clutch bearing; 251. Inner ring; 252. Outer ring; 253. Receiving cavity; 254. Cage; 255. Wedge; 256. Annular spring; 26. First stirring rod; 261. First horizontal section; 262. First inclined section; 27. Second stirring rod; 271. Second horizontal section; 272. Second inclined section. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0028] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Reference Figure 1 As shown, a dual-bearing positioning rotary mixing mechanism for a 3D printer includes a mixing chamber 10, a plurality of feeding ports 13 are provided on the top of the mixing chamber 10, a mixing chamber is provided inside the mixing chamber 10, and an extrusion head 11 is provided at the bottom of the mixing chamber 10, with an extrusion chamber provided inside the extrusion head 11.

[0030] Reference Figures 2-3As shown, the mixing and extrusion assembly 20 includes a drive component disposed above the mixing chamber 10. In this embodiment, the drive component is used to drive the conveyor to rotate. The drive component is a drive motor 21. A first bearing 22 is disposed on the inner wall of the top of the mixing chamber 10. A conveyor is disposed inside the mixing chamber 10. In this embodiment, the conveyor is a spiral auger assembly 23. The conveyor passes through the first bearing 22 and is connected to the drive component through a reducer 211. A second bearing 24 is disposed inside the mixing chamber 10. The conveyor passes through the second bearing 24 and extends to the bottom of the extrusion head 11. The conveyor is used to mix the material and extrude the material downwards. The first bearing disposed at the top of the hopper and the second bearing disposed inside the mixing chamber are used to fix the conveyor to prevent shaking, which would prevent precise control of the extruded material.

[0031] In this embodiment, to improve the mixing efficiency of the conveyor, a stirring rod is added to the part of the conveyor located in the mixing chamber 10. Traditional stirring rods have complex structures, often accumulating dirt and grime, making them difficult to clean, mainly due to the need for advanced mixing processes. However, in this invention, only the clay or concrete needs to be thoroughly mixed, eliminating the need for complex structures. This reduces time and cost while ensuring structural strength and improving mixing efficiency. Therefore, an integrated stirring screw structure for extruders is designed. The stirring paddle of this invention includes a first stirring rod assembly integrally formed on the conveyor, and a stirring rod assembly disposed on the conveyor... The second stirring rod assembly is located below the first stirring rod assembly on the conveyor. The first stirring rod assembly includes first stirring rods 26 symmetrically arranged on both sides of the conveyor. Each first stirring rod 26 includes a first horizontal section 261 and a first inclined section 262 integrally bent downwards with the first horizontal section 261. The angle between the first horizontal section 261 and the first inclined section 262 is α = 63~68°. The second stirring rod assembly includes second stirring rods 27 symmetrically arranged on the conveyor perpendicular to the direction of the first horizontal section 261. The second stirring rod 27 includes a second horizontal section 271 and a second horizontal section 271 integrally bent downwards with the second horizontal section 271. The second inclined segment 272 is folded into shape. The angle between the second horizontal segment 271 and the second inclined segment 272 is β = 70-75°. The length of the first horizontal segment 261 is longer than the length of the second horizontal segment 271. The stirring rod of this utility model is integrally welded with the conveying component, which has a simple structure, strong practicality, and can effectively prevent the problem of dirt accumulation and difficulty in cleaning. Moreover, the cross-section of the mixing chamber 10 is conical, so that the stirring rod can adapt to the shape of the mixing chamber 10. In this embodiment, the angle between the first horizontal segment 261 and the first inclined segment 262 is α = 64°. The angle between the second horizontal segment 271 and the second inclined segment 272 is β = 70-75°. The angle between the two inclined sections 272 is β = 75°. This is because there is a large space above the mixing silo 10, which is the material inlet, requiring a large mixing force to ensure thorough mixing of the materials. Therefore, the angle between the first horizontal section 261 and the first inclined section 262 is relatively small, resulting in a larger bending radius of the first inclined section 262, which improves its mixing efficiency in the horizontal direction and thus ensures thorough mixing of the materials. On the other hand, the angle between the second horizontal section 271 and the second inclined section 272 is relatively large, resulting in a smaller bending radius of the second inclined section 272, which strengthens its longitudinal unblocking ability and effectively prevents blockage at the bottom of the mixing silo.

[0032] Reference Figures 4-5As shown, in another embodiment, the auger assembly 23 includes a first auger 231 connected to the drive member. A second bearing 24 is fitted onto the sidewall of the first auger 231. The first auger 231 is connected to a second auger 232, which extends to the bottom of the extruder head 11. The pitch of the first auger 231 is greater than that of the second auger 232, and the blade diameter of the first auger 231 is greater than that of the second auger 232. Since the function of the first auger 231 is stirring, its larger pitch and blade diameter effectively improve stirring efficiency, while the smaller pitch and blade diameter of the second auger 232 allow for precise control of the extrusion of the mixture.

[0033] Reference Figures 5-6 As shown, how exactly is the second bearing 24 fixed? A mounting frame 12 is provided at the bottom of the mixing chamber 10. Several feeding troughs 121 are provided on the outside of the mounting frame 12. The material can flow along the feeding troughs 121 to the extrusion head 11. A mounting hole 122 is provided on the inside of the mounting frame 122. The second bearing 24 is provided on the mounting hole 122. The conveying component can be effectively fixed by the second bearing 24.

[0034] Reference Figure 7 As shown, the first auger 231 has a placement groove 2311 at its bottom, a clutch bearing 25 is disposed in the placement groove 2311, and a second auger 232 is disposed in the clutch bearing 25. The clutch bearing 25 includes an inner ring 251 and an outer ring 252 that rotates relative to the inner ring 251. The outer ring 252 abuts against the placement groove 2311. The second auger 232 is sleeved on the inner ring 251. There is a receiving cavity 253 between the inner ring 251 and the outer ring 252. A retainer 254 is disposed in the receiving cavity 253. Several inclined wedges 255 are disposed on the retainer 254. The wedges 255 are limited and fixed by a ring spring 256 surrounding the middle of the wedges 255. The length of the wedge 255 is defined as L, and the width of the receiving cavity 253 is defined as W. Then L > W. When the driving component drives the conveyor to reverse, When the center of each wedge 255 tilts to the left, the inner and outer rings disengage, and the outer ring rotates freely, the second spiral auger 232 does not rotate accordingly; when the drive unit drives the conveyor to rotate forward, the contact surface between the outer ring 252 and the wedge 255 generates friction, which generates a rightward tilting torque for the center of each irregular wedge 255, and the inner and outer rings 252 strongly mesh with it to achieve the function of transmitting torque, the second spiral auger 252 rotates accordingly. When the material is added into the mixing bin 10, the first spiral auger 231 reverses to mix the material first, and then extrudes the material while stirring it by rotating forward. It can also reverse to stir the material when the extruder is not working, to prevent the material from settling and sticking.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An integrated stirring screw structure for an extruder, characterized in that, include: The mixing chamber (10) has an extrusion head (11) at the bottom; The mixing extrusion assembly (20) includes a drive unit disposed on the side of the mixing chamber (10), which drives a conveyor disposed within the mixing chamber (10). A stirring paddle is disposed on the side wall of the conveyor. The stirring paddle includes a first stirring rod (26) group integrally formed on the conveyor and a second stirring rod (27) group disposed on the conveyor below the first stirring rod (26) group. The first stirring rod (26) group includes first stirring rods (26) symmetrically disposed on both sides of the first auger (231). 6) A first horizontal section (261) and a first inclined section (262) integrally bent downwards with the first horizontal section (261). The second stirring rod (27) group includes a second stirring rod (27) symmetrically arranged on both sides of the conveyor and perpendicular to the setting direction of the first horizontal section (261). The second stirring rod (27) includes a second horizontal section (271) and a second inclined section (272) integrally bent downwards with the second horizontal section (271). The length of the first horizontal section (261) is longer than the length of the second horizontal section (271).

2. The integrated stirring screw structure for an extruder according to claim 1, characterized in that, The angle between the first horizontal segment (261) and the first inclined segment (262) is α = 63 to 68°.

3. The integrated stirring screw structure for an extruder according to claim 2, characterized in that, The angle between the second horizontal segment (271) and the second inclined segment (272) is β = 70-75°.

4. The integrated stirring screw structure for an extruder according to claim 1, characterized in that, The conveying component is a spiral auger assembly (23), which includes a first spiral auger (231) connected to the driving component. A second bearing (24) is sleeved on the side wall of the first spiral auger (231). The first spiral auger (231) is connected to a second spiral auger (232), which extends to the bottom of the extruder head (11).

5. The integrated stirring screw structure for an extruder according to claim 4, characterized in that, The pitch of the first spiral auger (231) is greater than that of the second spiral auger (232), and the blade diameter of the first spiral auger (231) is greater than that of the second spiral auger (232).

6. The integrated stirring screw structure for an extruder according to claim 5, characterized in that, The first spiral auger (231) has a placement groove (2311) at its bottom, a clutch bearing (25) is placed in the placement groove (2311), and a second spiral auger (232) is placed in the clutch bearing (25).

7. The integrated stirring screw structure for an extruder according to claim 6, characterized in that, The clutch bearing (25) includes an inner ring (251) and an outer ring (252) that rotates relative to the inner ring (251). The outer ring (252) abuts against a placement groove (2311). The inner ring (251) is fitted with a second spiral auger (232). There is a receiving cavity (253) between the inner ring (251) and the outer ring (252). A retainer (254) is provided in the receiving cavity (253). Several inclined wedges (255) are provided on the retainer (254). The wedges (255) are limited and fixed by a ring spring (256) surrounding the middle of the wedges (255). The length of the wedges (255) is defined as L, and the width of the receiving cavity (253) is defined as W. Then L > W.

Images