Automatic feeding device of injection molding machine

Abstract

The utility model discloses an automatic feeding device of injection molding machine, including the hopper, the hopper has the hollow cavity, and the mixing mechanism is located hollow cavity, and the chute is installed in the lower part of hopper and is connected with the hopper, and the conveying screw driven by motor rotation is installed in the chute to convey the material in the chute to the outside of chute, the mixing mechanism includes the main shaft base, drive spindle, mixing wing piece and wall scraper, and drive spindle is driven by motor and extends to the cavity full depth along the main shaft base axial direction, and at least one group mixing wing piece group is coaxially fixed to the outer wall of drive spindle, and each group contains multiple mixing wing pieces equidistantly arranged along the axial direction, and each mixing wing piece cantilever end assembly wall scraper and the rotation track of wall scraper covers the whole wall of cavity, through being equipped with the through type mixing mechanism in the hopper, to expand the mixing area to the whole domain of hopper cavity, improve the mixing effect, combine wall scraper structure, realize the clean of cylinder wall without dead angle.

Description

Technical Field

[0001] This utility model relates to the technical field of material feeding for injection molding machines, and specifically to an automatic material feeding device for injection molding machines. Background Technology

[0002] In the injection molding process of plastic products, the homogeneous mixing of raw materials and colorants is a key process step to ensure the color of the product. Current technical solutions generally adopt an online mixing structure, which integrates a stirring device at the end of the feeding mechanism to achieve basic mixing using mechanical agitation. For example, patent CN222309601U proposes an automatic feeding mechanism for injection molding machines. This patent, by setting a stirring mechanism in the outlet area, ensures the mixing effect of raw materials and pigments on the one hand, and on the other hand, agitates the material gathered at the outlet of the container, dispersing the material and preventing accumulation, ensuring that the material can smoothly pass through the outlet from beginning to end. However, the existing technology still has the following technical defects:

[0003] 1. The mixing area is significantly limited. Because the above-mentioned patent places the mixing structure at the outlet of the feeding mechanism, it can only carry out limited mixing at the end of the material flow (i.e., the outlet of the feeding mechanism). As a result, the raw materials and colorants only come into contact and mix in the later stage of conveying, and the large-area mixing of the feeding mechanism is not achieved, resulting in limited mixing effect.

[0004] 2. Lack of adhesion removal function: The radial action range of the stirring structure of the above-mentioned patented technology solution is limited to 70%-80% of the distance from the shaft to the cylinder wall. It does not have an anti-scraping structure and cannot effectively remove the raw materials remaining on the cylinder wall.

[0005] To address the aforementioned technical problems, we provide an automatic feeding device for injection molding machines. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides an automatic feeding device for injection molding machines. A mixing blade group with multiple mixing blades is arranged vertically in the feeding chamber, thereby expanding the mixing area to the entire feeding chamber. Combined with a circumferentially covering wall scraper, it eliminates the blind spots of traditional mixing and effectively removes residues from the cylinder wall.

[0007] To achieve the above objectives, this utility model employs an automatic feeding device for an injection molding machine, including a feeding bin for introducing raw materials. The feeding bin has a hollow cavity, a mixing mechanism is located inside the hollow cavity, a chute is installed at the lower part of the feeding bin and communicates with the feeding bin, and a conveying screw driven by a motor is installed inside the chute to convey the material inside the chute to the outside of the chute.

[0008] The mixing mechanism includes a main shaft base, a drive main shaft, mixing blades, and a wall scraper. The drive main shaft is driven by a motor and extends axially along the main shaft base to the full depth of the cavity. At least one set of mixing blades is coaxially fixed to the outer wall of the drive main shaft. Each set includes multiple mixing blades arranged equidistantly along the axial direction. The cantilever end of each mixing blade is equipped with a wall scraper, and the rotation trajectory of the wall scraper covers the entire circumference of the inner wall of the cavity. By setting a through-type mixing mechanism in the feeding bin, the mixing area is expanded to the entire area of ​​the feeding bin cavity, improving the mixing effect. Combined with the wall scraper structure, the cylinder wall can be cleaned without dead corners.

[0009] As a further optimization of the above solution, the mixing blade and the wall scraper are detachable, which facilitates quick replacement of worn parts.

[0010] As a further optimization of the above scheme, the mixing blades on each mixing blade group are connected to the same wall scraper, and the two mixing blade groups are symmetrically arranged through the drive main shaft to form a frame-like structure.

[0011] As a further optimization of the above solution, the mixing blades are inclined, and the inclination directions of adjacent sets of mixing blades are different. The inclined blades accelerate the longitudinal diffusion of materials and enhance the mixing effect. The modular structure facilitates component interchange and reduces the cost of equipment modification and replacement.

[0012] As a further optimization of the above solution, the shaft connecting sleeve is coupled to the drive spindle, and the mixing blade and the fixed shaft connecting sleeve are detachably coupled.

[0013] As a further optimization of the above solution, the feeding hopper has a hollow cavity with a cross-sectional area that gradually decreases from the inlet end downwards, which guides the material through the shrinking cavity and improves the material guiding effect.

[0014] The automatic feeding device for an injection molding machine of this utility model has the following beneficial effects:

[0015] This utility model discloses an automatic feeding device for an injection molding machine. It achieves efficient mixing of injection molding raw materials through full-area mixing and structural optimization. The mixing mechanism adopts a through-type layout, and the driving spindle extends axially to the full depth of the feeding chamber, which significantly improves the mixing effect. Meanwhile, the circumferentially fully covered wall scraper is configured simultaneously, and its rotation trajectory is adapted to the curved surface of the inner wall of the chamber, which effectively removes adhering residues and maintains the cleanliness of the chamber.

[0016] This utility model discloses an automatic feeding device for an injection molding machine. The detachable blades and shaft connecting sleeves form a modular assembly design. Combined with the detachable blades to avoid scraping, it enhances the flexibility of the device and the interchangeability of parts, allows for quick replacement of worn parts, and reduces equipment replacement costs.

[0017] This utility model discloses an automatic feeding device for an injection molding machine. The feeding bin adopts a gradually narrowing cavity structure with a cross-sectional area decreasing from top to bottom, guiding the material movement path and improving the material guiding effect.

[0018] Referring to the following description and accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope as a result, and the embodiments of the present invention include many changes, modifications and equivalents. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an automatic feeding device for an injection molding machine;

[0020] Figure 2 This is a schematic diagram of the chute structure in this utility model;

[0021] Figure 3 This is a schematic diagram of the mixing mechanism in this utility model;

[0022] Figure 4 In this utility model Figure 3 Enlarged structural diagram at point A;

[0023] Figure 5 This is a schematic diagram of the mixing blade in this utility model.

[0024] In the diagram: 1. Feeding bin; 11. Hollow cavity; 2. Chute; 21. Conveying screw; 3. Mixing mechanism; 31. Main shaft base; 32. Drive main shaft; 33. Mixing blade; 34. Wall scraper; 35. Shaft connecting sleeve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope.

[0026] It should be noted that when an element is referred to as "set on" or "provided with" another element, it can be directly on the other element or there may be an intermediate element. When an element is referred to as "connected to" or "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. "Fixed connection" means fixed connection. There are many ways of fixed connection, which are not within the scope of protection of this document. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms used in the description herein are for the purpose of describing particular embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Please refer to the instruction manual appendix. Figure 1-5 This utility model provides a first embodiment of an automatic feeding device for an injection molding machine. In this embodiment, the automatic feeding device includes a feeding bin 1 located in the vertical direction for introducing and mixing materials, and guiding the mixed materials to a chute 2. The feeding bin 1 has a hollow cavity 11. Preferably, in this embodiment, the hollow cavity 11 adopts a cylindrical structure. The bottom of the hollow cavity is connected to the inclined chute 2. The chute 2 has a built-in spiral conveying shaft driven by a drive motor for conveying the materials in the chute 2 to the outside of the chute 2.

[0029] Preferably, in some embodiments, the top of the chute 2 is open and connected to the feeding bin 1 to introduce the material in the feeding bin 1 into the chute 2, and the other end is connected to an external device, such as an extrusion device, to convey the material in the chute 2 to the external device through the conveying action of the conveying screw 21.

[0030] In some possible examples, the conveying screw 21 includes a conveying screw 21 body mounted in the chute 2 and a double helical impeller formed on the outer surface of the conveying screw 21 body mounted in the chute 2.

[0031] In some possible examples, a liquid level sensor and an external controller connected to the liquid level sensor may also be installed in the feeding hopper 1 to measure the amount of material in the feeding hopper 1.

[0032] In some possible examples, a solenoid valve may also be installed at the discharge port of the feed hopper 1. This solenoid valve is connected to an external controller to control the amount of material entering the chute 2.

[0033] In this embodiment, the material in the feeding hopper 1 is mixed by a mixing mechanism 3. The mixing mechanism 3 consists of a rigid spindle base 31, a drive spindle 32, mixing blades 33, and a wall scraper 34. The drive spindle 32 is axially positioned by the spindle base 31. The power source of the drive spindle 32 is a motor. In this embodiment, the motor is mounted on the top surface of the spindle base 31 by a motor bracket. The drive spindle 32 is located on the bottom surface of the spindle base 31. The extension length of the drive spindle 32 covers the entire depth of the hollow cavity 11 of the feeding hopper.

[0034] At least one set of mixing blades is installed on the drive spindle 32. Each set of mixing blades includes mixing blades 33 arranged axially at equal intervals. The end of each mixing blade 33 is connected to a wall scraper 34. The inner wall of the hollow cavity 11 is located in the working path of the wall scraper 34, so that the wall scraper 34 and the inner wall of the hollow cavity 11 form a close contact, thereby achieving efficient mixing of raw materials throughout the feeding process and simultaneously removing residues from the cavity wall.

[0035] In summary, the above structure, through the full-depth through-drive design of the main shaft 32, enables the mixing area to cover the entire vertical flow of the feed hopper. Combined with the circumferential full-coverage motion trajectory of the wall scraper 34, it eliminates the blind spots of traditional mixing and maintains the cleanliness of the cavity wall.

[0036] Please refer to the instruction manual appendix. Figure 1-5 This utility model provides a second embodiment of an automatic feeding device for an injection molding machine. In this embodiment, the mixing mechanism 3 is designed as a modular structure. Specifically:

[0037] In this embodiment, the automatic feeding device includes a feeding bin for introducing raw materials. The feeding bin has a hollow cavity 11. The mixing mechanism 3 is located in the hollow cavity 11. The chute 2 is installed at the lower part of the feeding bin and communicates with the feeding bin. A conveying screw 21 driven by a motor is installed in the chute 2 to convey the material in the chute 2 to the outside of the chute 2.

[0038] The mixing mechanism 3 includes a main shaft base 31, a drive main shaft 32, mixing blades 33, and a wall scraper 34. The drive main shaft 32 is driven by a motor and extends axially along the main shaft base 31 to the full depth of the cavity. At least one set of mixing blades is coaxially fixed to the outer wall of the drive main shaft 32. Each set includes multiple mixing blades 33 arranged equidistantly along the axial direction. The cantilever end of each mixing blade 33 is equipped with a wall scraper 34, and the rotation trajectory of the wall scraper 34 covers the entire circumference of the inner wall of the cavity. By providing a through-type mixing mechanism 3 in the feeding bin, the mixing area is expanded to the entire area of ​​the feeding bin cavity, thereby improving the mixing effect. Combined with the structure of the wall scraper 34, the cylinder wall can be cleaned without dead corners.

[0039] Further improvements are made to the mixing mechanism 3 by designing the mixing blade 33 and the wall scraper 34 as detachable structures, such as plug-in structures, snap-fit ​​structures, and threaded structures. Preferably, in some embodiments, a plug-in connection structure is adopted. After the plug-in positioning is completed, the mixing blade 33 and the wall scraper 34 are secured by mortise and tenon structures, positioning pins, or locking bolts.

[0040] Furthermore, a shaft connecting sleeve 35 is assembled on the outer surface of the drive spindle 32. The shaft connecting sleeve 35 is provided with a radial groove. One end of the mixing blade 33 is inserted into the radial groove. Then, the mixing blade 33 and the shaft connecting sleeve 35 are fixed by means of flange positioning, so that the mixing blade 33 and the shaft connecting sleeve 35 form a detachable mating structure.

[0041] Further improvements are made to the mixing mechanism 3. In some possible examples, the mixing vanes 33 on each set of mixing vanes are connected to the same wall scraper 34. The two sets of mixing vanes are symmetrically arranged via a drive shaft 32, thus forming a frame-like structure. See details. Figure 5 The mixing blades 33 are inclined, and the inclination directions of two adjacent sets of mixing blades 33 are different. The inclined blades accelerate the longitudinal diffusion of materials and enhance the mixing effect. The modular structure facilitates component interchange and reduces equipment modification and replacement costs.

[0042] Furthermore, in some embodiments, to better guide the materials, the feeding hopper 1 adopts a tapered cavity configuration with a cross-sectional area decreasing from top to bottom, guiding the material movement path and improving the material guiding effect.

[0043] The automatic feeding device for an injection molding machine provided in this embodiment operates as follows:

[0044] S1. Material introduction: The raw material enters the hollow cavity 11 through the inlet at the top of the feed hopper, and is guided to flow downward under the action of gravity.

[0045] S2. The mixing mechanism 3 is started. At the same time as the material is introduced, the mixing mechanism 3 is started, and the main shaft 32 is driven by the motor to rotate, which drives the coaxially fixed mixing blade group to rotate and mix the raw materials inside the central control cavity.

[0046] S3. Material conveying: The mixed material enters the chute 2 and is pushed to the next device by the motor-driven conveying screw 21.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic feeding device for an injection molding machine, characterized by comprising: The material includes a feeding hopper (1) for introducing raw materials, the feeding hopper (1) having a hollow cavity (11), a mixing mechanism (3) located inside the hollow cavity (11), a chute (2) installed at the lower part of the feeding hopper (1) and connected to the feeding hopper (1), and a conveying screw (21) driven by a motor is installed in the chute (2) to convey the material in the chute (2) to the outside of the chute (2); The mixing mechanism (3) includes a main shaft base (31), a drive main shaft (32), mixing blades (33), and a wall scraper (34). The drive main shaft (32) is driven by a motor and extends axially along the main shaft base (31) to the full depth of the cavity. At least one set of mixing blades is coaxially fixed to the outer wall of the drive main shaft (32). Each set includes multiple mixing blades (33) arranged equidistantly along the axial direction. The cantilever end of each mixing blade (33) is equipped with a wall scraper (34), and the rotation trajectory of the wall scraper (34) covers the entire circumference of the inner wall of the cavity.

2. The automatic feeding device of an injection molding machine according to claim 1, characterized in that: The mixing blade (33) and the wall scraper (34) are detachably connected.

3. An automatic feeding device for an injection molding machine according to claim 1 or claim 2, characterized in that: Each mixing blade group has mixing blades (33) connected to the same wall scraper (34), and the two mixing blade groups are symmetrically arranged through the drive spindle (32).

4. An automatic feeding device for an injection molding machine according to claim 1 or claim 2, characterized in that: The mixing blade (33) is inclined.

5. The automatic feeding device for an injection molding machine according to claim 4, characterized in that: The two adjacent sets of mixing blades (33) have different tilt directions.

6. An automatic feeding device for an injection molding machine according to claim 1 or claim 2, characterized in that: The shaft connecting sleeve (35) is attached to the drive spindle (32), and the mixing blade (33) and the shaft connecting sleeve (35) are detachably fitted.

7. An automatic feeding device for an injection molding machine according to claim 1 or claim 2, characterized in that: The feeding hopper (1) has a hollow cavity (11) with a cross-sectional area that gradually decreases from the inlet end downwards.

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