Injection molding machine screw feed device
By introducing a vibratory feeder and heating chamber into the screw feeder of the injection molding machine, the problems of feed blockage and melt cooling are solved, ensuring smooth feed and stable melt delivery, thereby improving the quality and efficiency of injection molding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2026-03-19
- Publication Date
- 2026-07-14
AI Technical Summary
Existing injection molding machine screw feeding devices are prone to bridging and clogging of the feed inlet. The drop in plastic temperature at the discharge end also leads to blockage of the discharge outlet, affecting production efficiency and product quality.
A feeding mechanism including a vibrator, funnel, hose and connecting pipe was designed. Combined with a heating box and resistance wire, it breaks up material agglomerates through high-frequency vibration to ensure smooth feeding and provides uniform heating at the injection hole to prevent the melt from cooling and solidifying. The design incorporates a sealing system and a controller to centrally control the operation of each component.
It achieves stability of the feeding channel and uniform delivery of the melt, avoiding problems such as blockage and uneven temperature, and improving the integrity of injection molding and the level of automation in production.
Smart Images
Figure CN224489836U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of feeding devices, specifically a screw feeding device for an injection molding machine. Background Technology
[0002] As a core component of the injection molding system, the screw feeder of the injection molding machine is responsible for accurately receiving solid plastic particles. Through orderly conveying, gradient compression, efficient melting and homogenization, it continuously outputs a stable and qualified melt flow, providing core support for subsequent injection molding processes and directly affecting product molding quality and production efficiency.
[0003] In existing technologies, the plastic at the feed end is prone to bridging and clogging of the feed port, while at the discharge end, the plastic temperature drops and solidifies due to the greater distance, which in turn causes the discharge port to become blocked. Utility Model Content
[0004] The purpose of this invention is to provide a screw feeding device for injection molding machines, which has the advantages of providing plastic quickly and stably, avoiding plastic blockage of the feed inlet, maintaining the plastic temperature continuously, and reducing material retention, thus solving the problems in the prior art.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A screw feeding device for an injection molding machine includes a pad plate, a feeding mechanism at the upper end of the pad plate, two first support blocks at the upper end of the pad plate, a first hole through one side of each of the two first support blocks, a barrel fixedly connected to the inner wall of the first hole of the two first support blocks, a first groove at the upper end of the pad plate, a first electric cylinder fixedly connected to the inner wall of the first groove, a converter block fixedly connected to the output end of the first electric cylinder, a motor fixedly connected to the upper end of the converter block, and a screw body fixedly connected to the output end of the motor, the screw body being located on the inner wall of the barrel.
[0007] Preferably, the feeding mechanism includes support columns, a feeding pipe, a vibrator, a connecting block, a funnel, a hose, a connecting pipe, and a fourth tank; two support columns are fixedly connected to the upper end of the pad, the two support columns are located on both sides of the machine barrel, a second hole is opened at the upper end of the pad, a feeding pipe is fixedly connected to the upper end of the pad, the feeding pipe is located above the second hole, a support plate is fixedly connected to the upper end of the two support columns, a vibrator is bolted to the upper end of the support plate, a connecting block is fixedly connected to the output end of the vibrator, a funnel is fixedly connected to one side of the connecting block, a hose is fixedly connected to the lower end of the funnel, and a connecting pipe is fixedly connected to the lower end of the hose.
[0008] It is worth noting that the support column and support plate form a stable support structure, providing an installation foundation for the vibrator. The vibrator can effectively break up material agglomerates, avoid bridging at the feed inlet, and improve the smoothness of material falling. The combination of hose and connecting pipe can adapt to the material conveying angle. The nozzle block design expands the feeding range, reduces material spillage, and adapts to the conveying needs of raw materials with different particle sizes.
[0009] Preferably, the upper end of the support plate is provided with a fourth groove, the inner wall of the connecting pipe is provided with a first thread, the side wall of the feed pipe is provided with a second thread, and the lower end of the connecting pipe passes through the fourth groove and is threaded together with the feed pipe.
[0010] It is worth noting that the threaded connection method is easy to disassemble and assemble, which facilitates the cleaning, maintenance and component replacement of the feeding system. The fourth groove plays a positioning and guiding role for the connecting pipe, ensuring that the connecting pipe and the feeding pipe are accurately connected, with strong tightness, avoiding leakage during material conveying and ensuring the sealing of the feeding channel.
[0011] Preferably, the output end of the barrel is a nozzle block, and the inner wall of the injection hole is in contact with the side wall of the barrel.
[0012] It is worth noting that the output end of the nozzle block can guide the concentrated flow of molten material, improve the material filling effect of the mold, and the close fit between the injection hole and the side wall of the barrel reduces the risk of melt leakage, ensures stable injection pressure, avoids insufficient filling caused by pressure loss, and improves the integrity of injection molding.
[0013] Preferably, a second groove is provided on one side of the pad, a second electric cylinder is fixedly connected to the inner wall of the second groove, a second support block is fixedly connected to the output end of the second electric cylinder, an injection hole is provided on the side of the second support block near the pad, and two third grooves are provided on the side of the second support block near the pad, a heating box is fixedly connected to the inner wall of the two third grooves, and a resistance wire is fixedly connected to the inner wall of the heating box.
[0014] It is worth noting that the second electric cylinder can flexibly adjust the position of the second support block to adapt to the installation requirements of molds of different specifications, thereby improving the versatility of the equipment. The configuration of the heating box and resistance wire can keep the melt at the injection hole warm or provide auxiliary heating, preventing the melt from cooling and solidifying in the injection channel and ensuring a smooth injection process.
[0015] Preferably, the two third tanks are located at the upper and lower ends of the injection hole, respectively. The third tank is located on the inner wall of the upper end of the injection hole, and the heating box is located at the lower end of the third tank, on the inner wall of the lower end of the injection hole, and at the upper end of the third tank.
[0016] It is worth noting that the symmetrical heating layout ensures a uniform temperature distribution around the injection hole, avoiding inconsistent melt states caused by local temperature differences. The heating box is designed to directly act on the area around the injection channel, resulting in high heat transfer efficiency. This ensures that the melt remains in a stable plasticized state throughout the injection process, reducing product defects caused by uneven temperature.
[0017] Preferably, a gap is left between the side wall of the screw body and the inner wall of the barrel.
[0018] It is worth noting that: it can effectively prevent the screw and barrel from jamming due to thermal expansion, ensuring the safety of equipment operation. The gap allows the molten material to form a thin molten film, which plays a role in sealing and lubrication, reducing direct wear between the screw and barrel, extending the service life of both, and at the same time helping to generate shear heat and improve plasticizing uniformity.
[0019] Preferably, a controller is fixedly connected to one side of the pad, and the controller is electrically connected to the first electric cylinder, the motor, the feed pipe, and the vibrator.
[0020] It is worth noting that centralized control of multiple components greatly improves ease of operation, reduces manual intervention steps, and enables precise adjustment of operating parameters of each component, such as electric cylinder stroke, motor speed, and vibratory machine frequency. This enhances the automation level of the production process, allows for real-time response to changes in process requirements, ensures stable overall equipment operation, and reduces the risk of operational errors.
[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0022] 1. This utility model uses a vibrator to drive a funnel at high frequency to directly break up material agglomeration, avoiding bridging at the feed inlet from the source. At the same time, the funnel's large feed range design and the flexible angle adaptation of the hose and connecting pipe ensure that materials of different particle sizes can fall smoothly. In addition, the precise thread connection between the connecting pipe and the feed pipe prevents blockage caused by leakage and accumulation during material transportation, ensuring smooth feed channel in all aspects.
[0023] 2. A heating box and resistance wire are installed in the third groove at both ends of the injection hole. The symmetrical heating layout continuously keeps the area around the injection channel warm, preventing the molten material from cooling and solidifying at the end. Combined with the centralized flow guiding design of the funnel-shaped output end of the barrel and the tight fit between the injection hole and the side wall of the barrel, it not only ensures stable injection pressure, but also reduces the possibility of melt retention and cooling, and completely solves the problem of outlet blockage. Attached Figure Description
[0024] Figure 1 This is an isometric schematic diagram of the overall structure of this utility model;
[0025] Figure 2 This is a cross-sectional schematic diagram of the screw body of this utility model;
[0026] Figure 3 This is a cross-sectional schematic diagram of the heating box of this utility model;
[0027] Figure 4 This is a schematic diagram of the feeding mechanism of this utility model from the side.
[0028] Figure 5 For the present utility model Figure 2 A magnified view of a portion of point A in the middle.
[0029] Reference numerals: 1. Pad; 2. Feeding mechanism; 3. First support block; 4. Barrel; 5. First tank; 6. First electric cylinder; 7. Adapter block; 8. Motor; 9. Screw body; 10. Second tank; 11. Second electric cylinder; 12. Second support block; 13. Injection hole; 14. Third tank; 15. Heating box; 16. Resistance wire; 21. Support column; 22. Feed pipe; 23. Vibrator; 24. Connecting block; 25. Funnel; 26. Hose; 27. Connecting pipe; 28. Fourth tank. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] To address the problems in existing technologies where plastic bridging at the inlet causes blockage, and the greater distance at the outlet leads to a drop in plastic temperature and solidification, resulting in outlet blockage, the following technical solution is provided. Please refer to [link / reference]. Figure 1-5 ;
[0032] A screw feeding device for an injection molding machine includes a pad plate 1, a feeding mechanism 2 at the upper end of the pad plate 1, two first support blocks 3 at the upper end of the pad plate 1, a first hole through one side of each of the two first support blocks 3, a barrel 4 fixedly connected to the inner wall of the first hole of the two first support blocks 3, a first groove 5 at the upper end of the pad plate 1, a first electric cylinder 6 fixedly connected to the inner wall of the first groove 5, a converter block 7 fixedly connected to the output end of the first electric cylinder 6, a motor 8 fixedly connected to the upper end of the converter block 7, a screw body 9 fixedly connected to the output end of the motor 8, and the screw body 9 located on the inner wall of the barrel 4.
[0033] The feeding mechanism 2 includes support columns 21, a feed pipe 22, a vibrator 23, a connecting block 24, a funnel 25, a hose 26, a connecting pipe 27, and a fourth trough 28. Two support columns 21 are fixedly connected to the upper end of the pad 1, located on opposite sides of the barrel 4. A second hole is opened at the upper end of the pad 1, and a feed pipe 22 is fixedly connected to the upper end of the pad 1, positioned above the second hole. Support plates are fixedly connected to the upper ends of the two support columns 21, and the vibrator 23 is bolted to the upper end of the support plates. A connecting block 24 is fixedly connected to the output end of the vibrator 23. A funnel 25 is fixedly connected to one side of block 24, a hose 26 is fixedly connected to the lower end of the funnel 25, a connecting pipe 27 is fixedly connected to the lower end of the hose 26, a fourth groove 28 is opened through the upper end of the support plate, a first thread is opened on the inner wall of the connecting pipe 27, a second thread is opened on the side wall of the feed pipe 22, and the lower end of the connecting pipe 27 passes through the fourth groove 28 and is threaded together with the feed pipe 22. A gap is left between the side wall of the screw body 9 and the inner wall of the barrel 4. A controller is fixedly connected to one side of the pad plate 1. The controller is electrically connected to the first electric cylinder 6, the motor 8, the feed pipe 22, and the vibrator 23.
[0034] The output end of the barrel 4 is a nozzle block. The inner wall of the injection hole 13 is in contact with the side wall of the barrel 4. A second groove 10 is provided on one side of the pad 1. A second electric cylinder 11 is fixedly connected to the inner wall of the second groove 10. A second support block 12 is fixedly connected to the output end of the second electric cylinder 11. An injection hole 13 is provided on the side of the second support block 12 near the pad 1. Two third grooves 14 are provided on the side of the second support block 12 near the pad 1. A heating box 15 is fixedly connected to the inner wall of the two third grooves 14. A resistance wire 16 is fixedly connected to the inner wall of the heating box 15. The two third grooves 14 are located at the upper and lower ends of the injection hole 13, respectively. The inner wall of the third groove 14 located at the upper end of the injection hole 13 is located at the lower end of the third groove 14. The inner wall of the third groove 14 located at the lower end of the injection hole 13 is located at the upper end of the third groove 14.
[0035] Working principle: During operation, the feeding mechanism 2 starts first. The stable structure formed by the support column 21 and the support plate provides a solid installation foundation for the vibrator 23. The vibrator 23 drives the funnel 25 to vibrate at high frequency through the connecting block 24, effectively breaking up material agglomeration and avoiding bridging at the feed inlet. The funnel 25, which expands the feeding range, guides the material into the hose 26. The hose 26 and the connecting pipe 27 are matched to different conveying angles. After the connecting pipe 27 passes through the fourth groove 28 on the support plate, it is precisely connected to the feed pipe 22 through the threaded structure, which not only ensures the connection is sealed to prevent material leakage, but also facilitates subsequent cleaning and maintenance. The material smoothly enters the inside of the barrel 4 through this channel. Meanwhile, the first support block 3 on the pad 1 reliably fixes the barrel 4 through the first hole. The first electric cylinder 6 in the first groove 5 drives the adapter block 7, thereby adjusting the position of the motor 8 and the screw body 9. After the motor 8 starts, it drives the screw body 9 to rotate inside the barrel 4. The gap reserved between the screw body 9 and the inner wall of the barrel 4 prevents them from getting stuck due to thermal expansion. At the same time, it allows the molten material to form a thin melt film, which not only achieves sealing and lubrication to reduce wear, but also helps to generate shear heat and improve the uniformity of plasticization. The material is gradually plasticized along the barrel 4 under the rotation and pushing of the screw body 9. The plasticized molten material reaches the nozzle output end of the barrel 4. This structure guides the concentrated flow of the material. With the injection hole 13 that fits tightly against the side wall of the barrel 4, it reduces melt leakage and ensures stable injection pressure, ensuring that the material is fully filled. The second electric cylinder 11 on one side of the pad 1 can flexibly adjust the position of the second support block 12 to adapt to the installation requirements of molds of different specifications. The two third grooves 14 on the second support block 12 are symmetrically distributed at the upper and lower ends of the injection hole 13. The heating box 15 and the resistance wire 16 in the groove act precisely on the periphery of the injection channel, keeping the melt warm through uniform heating to prevent cooling and solidification, ensuring a smooth injection process and reducing product defects caused by uneven temperature. During the entire operation, the controller on the pad 1 centrally controls the first electric cylinder 6, motor 8, vibrator 23, and other components, precisely adjusting parameters such as the stroke of the first electric cylinder 6 and the second electric cylinder 11, the speed of the motor 8, and the frequency of the vibrator 23, greatly improving the ease of operation and automation level, responding to process changes in real time, ensuring the overall stable operation of the equipment, and reducing the risk of operational errors.
[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.
[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A screw feeding device for an injection molding machine, comprising a pad (1), characterized in that, The upper end of the pad (1) is provided with a feeding mechanism (2), and the upper end of the pad (1) is provided with two first support blocks (3). One side of each of the two first support blocks (3) is provided with a first hole. The inner walls of the first holes of the two first support blocks (3) are fixed to the machine barrel (4). The upper end of the pad (1) is provided with a first groove (5). The inner wall of the first groove (5) is fixed to a first electric cylinder (6). The output end of the first electric cylinder (6) is fixed to a converter block (7). The upper end of the converter block (7) is fixed to a motor (8). The output end of the motor (8) is fixed to a screw body (9). The screw body (9) is located on the inner wall of the machine barrel (4).
2. The screw feeding device for an injection molding machine according to claim 1, characterized in that, The feeding mechanism (2) includes a support column (21), a feed pipe (22), a vibrator (23), a connecting block (24), a funnel (25), a hose (26), a connecting pipe (27), and a fourth tank (28). The upper end of the pad (1) is fixed with two support columns (21), which are located on both sides of the barrel (4). The upper end of the pad (1) is provided with a second hole. The upper end of the pad (1) is fixed with a feed pipe (22), which is located at the upper end of the second hole. The upper end of the two support columns (21) is fixed with a support plate. The upper end of the support plate is bolted with a vibrator (23). The output end of the vibrator (23) is fixed with a connecting block (24). The side of the connecting block (24) is fixed with a funnel (25). The lower end of the funnel (25) is fixed with a hose (26), and the lower end of the hose (26) is fixed with a connecting pipe (27).
3. The screw feeding device for an injection molding machine according to claim 2, characterized in that, The upper end of the support plate is provided with a fourth groove (28), the inner wall of the connecting pipe (27) is provided with a first thread, the side wall of the feed pipe (22) is provided with a second thread, and the lower end of the connecting pipe (27) passes through the fourth groove (28) and is threaded together with the feed pipe (22).
4. The screw feeding device for an injection molding machine according to claim 1, characterized in that, The output end of the barrel (4) is a nozzle block, and the inner wall of the injection hole (13) is in contact with the side wall of the barrel (4).
5. The screw feeding device for an injection molding machine according to claim 1, characterized in that, A second groove (10) is provided on one side of the pad (1). A second electric cylinder (11) is fixed to the inner wall of the second groove (10). A second support block (12) is fixed to the output end of the second electric cylinder (11). An injection hole (13) is provided on the side of the second support block (12) near the pad (1). Two third grooves (14) are provided on the side of the second support block (12) near the pad (1). A heating box (15) is fixed to the inner wall of the two third grooves (14). A resistance wire (16) is fixed to the inner wall of the heating box (15).
6. The screw feeding device for an injection molding machine according to claim 5, characterized in that, Two third tanks (14) are located at the upper and lower ends of the injection hole (13), respectively. The inner wall of the third tank (14) is located at the upper end of the injection hole (13). The heating box (15) is located at the lower end of the third tank (14), and the inner wall of the third tank (14) is located at the lower end of the injection hole (13). The heating box (15) is located at the upper end of the third tank (14).
7. The screw feeding device for an injection molding machine according to claim 1, characterized in that, There is a gap between the side wall of the screw body (9) and the inner wall of the barrel (4).
8. The screw feeding device for an injection molding machine according to claim 2, characterized in that, A controller is fixedly connected to one side of the pad (1), and the controller is electrically connected to the first electric cylinder (6), the motor (8), the feed pipe (22), and the vibrator (23).