Feeding structure of extruder

Abstract

The utility model discloses a feeding structure of an extruder, which comprises a mounting plate, a driving motor is arranged on the mounting plate, a driving wheel is arranged at the output end of the driving motor, two groups of pressing bearings are vertically arranged on one side of the driving wheel through pin shafts, and a material channel is formed between the two groups of pressing bearings and the driving wheel. By arranging the two sets of material pressing bearings, the material pressing bearings can be better attached to the driving wheel when extruding materials, the contact area is increased, and therefore larger transmission force is provided, and the situation that due to material flexibility, the contact area is not enough, and consequently material conveying slipping is caused is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to an extruder feeding structure. Background Art

[0002] In recent years, with the popularization of 3D printing technology, its application fields have become more and more extensive, such as: 3D printed bones, prostheses, artificial hearts, aircraft parts, etc. In 2022, the National Innovation Competition of Medical 3D Printing Technology and Application was held. The competition proposed the use of 3D printing technology to print "child-friendly muscle-like bionic elastic 3D printed orthopedic insoles". The insoles use TPU-type flexible materials, which have good elasticity and can produce "muscle-like bionic elasticity" to assist in correcting poorly shaped bones. This application will make 3D printing technology more applicable to real life.

[0003] The TPU material mentioned above has many characteristics: TPU is an environmentally friendly material, non-toxic and odorless; high elasticity, its elongation can exceed 500%, and it has good resilience and low temperature resistance; it can still work normally at -40°C; wear resistance, its wear resistance is 2-10 times that of natural rubber, and it is still not easy to wear after long-term use; good processing performance, good oil resistance, high mechanical strength, widely used in medical equipment, blood transfusion tubes; footwear, clothing, sports equipment, car seats, umbrellas, suitcases and bags and other products.

[0004] TPU materials have a range of hardness, which can be divided into: 60A, 65A, 75D, 85A, 95A, etc. The larger the number, the harder the material. Since TPU materials have many advantages, they are urgently needed to be developed and applied in the field of 3D printing. In the field of printing, the problem that needs to be solved is the flexibility of TPU, which brings troubles to printing and feeding. Because printers mostly use gear transmission to feed materials, they have high elasticity and high flexibility. There will be changes in the thickness of the material during the material transmission process. For example, when the feeding is not smooth, the material is blocked, which will cause the material to bend and fold out of the gap. For example, when the material is retracted, the tension generated by the material becomes thinner, which makes it impossible to fully contact the gear, resulting in insufficient transmission force, which in turn leads to transmission failure. Among all TPU materials, the more flexible the material is, the higher the transmission requirements for the extruder. For example, there are very few extruders on the market for 60A and 65A that can truly and effectively realize printing transmission. Utility Model Content

[0005] In order to address the deficiencies of the prior art, the present application provides an extruder feeding structure, including a mounting plate, a driving motor is arranged on the mounting plate, a driving wheel is arranged at the output end of the driving motor, two groups of pressure bearings are arranged up and down on one side of the driving wheel through a pin shaft, and a material channel is formed between the two groups of pressure bearings and the driving wheel.

[0006] Furthermore, the extruder feeding structure also includes an extrusion assembly, which includes an extrusion plate, the bottom end of the extrusion plate is rotatably connected to the mounting plate via a pin, the top end of the extrusion plate is connected to the mounting plate via a screw, a spring is sleeved on the screw, and the top end of the extrusion plate is movably sleeved on the screw and abuts against the spring.

[0007] Furthermore, two groups of mounting grooves are provided on the extrusion plate, and the press bearing is installed in the mounting grooves and protrudes out of the mounting grooves.

[0008] Furthermore, the driving wheel is provided with a plurality of feeding wheel teeth, and the feeding wheel teeth are concavely arranged toward the center direction of the driving wheel.

[0009] Furthermore, the feeding gear teeth are arc-shaped gear teeth.

[0010] Furthermore, the outer diameter of the driving wheel is 22 mm.

[0011] Furthermore, a first reduction gear and a second reduction gear are also provided on the mounting plate, the first reduction gear is meshedly connected with the output gear of the driving motor, the second reduction gear is meshedly connected with the first reduction gear, and the driving wheel is coaxially connected with the second reduction gear.

[0012] The benefit of the present application lies in that the provided extruder feeding structure can be more closely fitted to the driving wheel when extruding the material by setting two sets of pressure bearings, thereby increasing the contact area and providing greater transmission force, thereby preventing material transmission slippage due to insufficient contact area caused by material flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of an embodiment of the extruder feeding structure of the present application;

[0014] Figure 2 for Figure 1 Schematic diagram of the middle driving wheel structure;

[0015] Figure 3 for Figure 1 Schematic diagram of the extrusion component structure.

[0016] Marked in the figure: 10, mounting plate, 11 driving motor, 12, driving wheel, 121, feeding wheel teeth, 13, pressing bearing, 131, first pin shaft, 14, material channel, 15, extrusion assembly, 151, extrusion plate, 152, second pin shaft, 153, screw, 154, spring, 16, first reduction gear, 17, second reduction gear. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0018] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0021] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] See also Figure 1-3 The present embodiment provides an extruder feeding structure, including a mounting plate 10, a driving motor 11 is arranged on the mounting plate 10, a driving wheel 12 is arranged at the output end of the driving motor 11, two sets of pressure bearings 13 are arranged up and down on one side of the driving wheel 12 through a pin shaft, and a material channel 14 is formed between the two sets of pressure bearings 13 and the driving wheel 12.

[0024] Specifically, a first reduction gear 16 and a second reduction gear 17 are also provided on the mounting plate 10. The first reduction gear 16 is meshedly connected with the output gear of the driving motor 10, the second reduction gear 17 is meshedly connected with the first reduction gear 17, and the driving wheel 12 is coaxially connected with the second reduction gear, wherein the driving motor adopts a direct drive motor.

[0025] The feeding structure of the present application also includes an extrusion assembly 15, which includes an extrusion plate 151. The bottom end of the extrusion plate 151 is rotatably connected to the mounting plate 10 via a second pin shaft 152. Two groups of vertically parallel mounting grooves are provided on the extrusion plate 15. The two press bearings 13 are rotatably installed in the mounting grooves via first pin shafts 131 respectively. The top end of the extrusion plate is connected to the mounting plate 10 via a screw 153. A spring 154 is sleeved on the screw. The top end of the extrusion plate 151 is movably sleeved on the screw and abuts against the spring 154.

[0026] General printing consumables are cylindrical in structure. In order to facilitate the transmission of consumables, the driving wheel 12 is provided with a plurality of feeding gear teeth 121. The feeding gear teeth 121 are concavely arranged toward the center of the driving wheel and are arc-shaped gear teeth. At the same time, in order to increase the contact area between the driving wheel and the material (because the larger the contact area, the greater the friction force can be provided, thereby providing a greater transmission force), the outer diameter of the driving wheel reaches 22 mm, which is more than twice the 9 mm of the most commonly used BMG double gears on the market. After testing, the material contact arc length increased from the original 1.92 mm to 8.23 ​​mm, and the contact area increased by more than 4 times, which can well print TPU materials with a hardness of 65A.

[0027] Working principle: When the material just starts to enter the material channel 14, a certain force is applied to the extrusion plate, and then through the action of the spring, the extrusion plate drives the pressure bearing 13 to extrude the material, and then cooperates with the driving wheel 12 to feed the material to prevent slipping.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An extruder feeding structure, comprising a mounting plate, characterized in that: A driving motor is arranged on the mounting plate, a driving wheel is arranged at the output end of the driving motor, two groups of press bearings are arranged up and down on one side of the driving wheel through a pin shaft, and a material channel is formed between the two groups of press bearings and the driving wheel.

2. An extruder feeding structure according to claim 1, characterized in that: The extruder feeding structure also includes an extrusion assembly, which includes an extrusion plate. The bottom end of the extrusion plate is rotatably connected to the mounting plate via a pin, and the top end of the extrusion plate is connected to the mounting plate via a screw. A spring is sleeved on the screw, and the top end of the extrusion plate is movably sleeved on the screw and abuts against the spring.

3. An extruder feeding structure according to claim 2, characterized in that: The extrusion plate is provided with two groups of mounting grooves, and the press bearing is installed in the mounting grooves and protrudes out of the mounting grooves.

4. The extruder feeding structure according to claim 1, characterized in that: The driving wheel is provided with a plurality of feeding wheel teeth, and the feeding wheel teeth are arranged concavely toward the center direction of the driving wheel.

5. The extruder feeding structure according to claim 4, characterized in that: The feeding gear teeth are arc-shaped gear teeth.

6. An extruder feeding structure according to claim 4, characterized in that: The outer diameter of the driving wheel is 22 mm.

7. The extruder feeding structure according to claim 1, characterized in that: The mounting plate is also provided with a first reduction gear and a second reduction gear, the first reduction gear is meshedly connected with the output gear of the driving motor, the second reduction gear is meshedly connected with the first reduction gear, and the driving wheel is coaxially connected with the second reduction gear.

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