Multi-cavity cup cover injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to a multi-cavity cup cover injection mold which comprises an upper mold main body and a lower mold main body which are correspondingly matched with each other, and a mold core assembly and an ejection mechanism which is in butt joint with the mold core assembly are arranged between the upper mold main body and the lower mold main body; wherein the mold core assembly comprises an upper mold core and a plurality of lower mold cores which are in butt joint with the lower end of the upper mold core, a plurality of product outer side profiling structures which are distributed in an array mode are formed at the lower end of the upper mold core, product inner side profiling structures which are in butt joint with the product outer side profiling structures are formed on the lower mold cores, and positioning insertion blocks and positioning insertion grooves are installed in a matched mode. The lower mold core can be conveniently positioned and mounted on the lower mold main body, and the ejection plate of the ejection mechanism is matched with the lower mold core and the upper mold core to form a cavity and realize an ejection function, so that one-mold multi-cavity efficient production is ensured, and meanwhile, demolding can be completed while all molded cup covers are molded only through one ejection plate, the arrangement of a complex ejection structure is reduced, and the production efficiency is improved. And the mold cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a multi-cavity cup lid injection mold. Background Technology

[0002] In the manufacturing of disposable cup lids, injection molds are crucial molding equipment. To effectively improve the molding rate of disposable cup lids and meet the growing market demand, existing disposable cup lid injection molds typically feature multiple cavities. This multi-cavity design allows for the molding of multiple cup lids in a single injection process, significantly improving production efficiency. The mold mainly consists of an upper mold core, a lower mold core, and an annular ejector structure on the lower mold. This annular ejector structure applies an ejection force to the edge of the molded cup lid during mold opening, facilitating its smooth detachment from the lower mold core. However, as the number of cavities in the mold increases, the number of related components, such as the annular ejector structure, also increases. This not only makes the overall mold structure more complex and the assembly relationships between components more cumbersome, increasing the difficulty and time cost of mold assembly, but also requires higher assembly precision. Assembly errors can easily affect the mold's performance and the molding quality of the cup lids, thereby reducing production efficiency and increasing production costs. Therefore, it is urgent to improve the existing disposable cup lid injection mold structure to solve the problem of high assembly complexity caused by the multi-cavity design. Utility Model Content

[0003] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0004] A multi-cavity cup lid injection mold includes an upper mold body and a lower mold body that correspond to and cooperate with each other. A mold core assembly and an ejection mechanism docking with the mold core assembly are provided between the upper mold body and the lower mold body.

[0005] The mold core assembly includes an upper mold core and multiple lower mold cores docking at the lower end of the upper mold core. The lower end of the upper mold core is formed with multiple arrayed outer contour structures of the product, and the lower mold cores are formed with inner contour structures of the product docking with the outer contour structures of the product. Multiple positioning slots are provided in an array on the lower mold body, and positioning blocks are formed at the lower end of the lower mold cores to dock with the positioning slots. The lower mold cores are positioned and installed on the lower mold body through the cooperation of the positioning blocks and positioning slots. The ejection mechanism is provided with an ejection plate installed on the lower mold body. Multiple circular through holes are provided in an array on the ejection plate. Multiple lower mold cores are docked sequentially in multiple circular through holes, so that the outer contour structure of the product, the inner contour structure of the product, and the ejection plate form a cavity for molding a cup lid. A glue injection mechanism is provided on the upper mold body that extends into the cavity along the upper mold core.

[0006] Preferably, the lower mold body is provided with a plurality of circular bosses corresponding to the lower mold core, and the positioning slot is provided on the circular bosses so that the lower mold core is mated to the circular bosses. An annular groove is provided on the circular bosses surrounding the positioning slots, and screw connection holes are provided on the circular bosses at positions other than the annular grooves. The lower end of the lower mold core is provided with a threaded hole that mates with the screw connection holes. The lower mold core is screwed to the circular bosses through the screw connection holes and the threaded hole.

[0007] Preferably, the upper mold body includes a panel, a hot runner plate installed at the lower end of the panel, and an upper mold plate installed at the lower end of the hot runner plate. The upper mold core is embedded in the upper mold plate. The glue injection mechanism includes a main runner bushing disposed on the panel and connected to the hot runner plate, and a hot nozzle embedded in the upper mold core and connected to the hot runner plate. The hot nozzle is connected to the cavity.

[0008] Preferably, the lower mold body includes a base plate, a square plate mounted on the base plate, and a lower mold plate mounted on the square plate. The base plate and the lower mold plate form an active space through the square plate. The ejection mechanism is also provided with a push plate that is guided and connected between the lower mold plate and the base plate, and an ejection push rod that is driven and connected between the push plate and the ejection plate. The ejection plate is guided and connected to the lower mold plate through the ejection push rod. The lower mold plate is mated and cooperated with the upper mold plate, and the lower mold core is mounted on the lower mold plate.

[0009] Preferably, the lower end of the upper mold core is formed with a sloping protrusion, and the lower mold plate is provided with a sloping groove that engages with the sloping protrusion. The upper mold core and the lower mold plate are guided and engaged through the sloping protrusion and the sloping groove, and a wear-resistant plate is provided between the sloping protrusion and the sloping groove.

[0010] Preferably, the outer wall of the lower mold core and the inner wall of the circular through hole are both inclined surfaces, so that the ejector plate can restrict the lower mold core on the lower mold body.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] By using positioning blocks and positioning slots, the lower mold core can be easily positioned and installed on the lower mold body. The ejector plate of the ejection mechanism, in conjunction with the lower and upper mold cores, forms a cavity and performs the ejection function. This ensures efficient multi-cavity production while allowing for simultaneous demolding of all molded cup caps using only one ejector plate, reducing the need for complex ejection structures and lowering mold costs. Furthermore, the simple design of positioning blocks and slots for positioning the lower mold core on the lower mold body allows for quick and accurate installation and fixation of the new lower mold core even when product dimensions or shapes change and the mold core assembly needs to be replaced. This significantly enhances the mold's adaptability to different product requirements and greatly improves its versatility and flexibility.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model;

[0017] Figure 3 This is a schematic diagram of one structure of the present invention after removing the upper mold body;

[0018] Figure 4 This is a schematic diagram of another structure of the present invention after removing the upper mold body;

[0019] Figure 5 This is a structural schematic diagram of the lower template, ejector plate, and lower mold core in this utility model;

[0020] Figure 6 This is a partial structural diagram of the ejector plate and lower mold core in this utility model.

[0021] The reference numerals and names in the figure are as follows:

[0022] Upper mold body 10, panel 101, hot runner plate 102, upper template 103, main runner bushing 104, hot nozzle 105, lower mold body 20, base plate 201, square plate 202, lower template 203, positioning slot 21, circular boss 22, annular groove 23, screw connection hole 24, inclined groove 25, wear-resistant plate 26, mold core assembly 30, upper mold core 31, lower mold core 32, outer contour structure of product 33, inner contour structure of product 34, positioning insert 35, threaded hole 36, inclined protrusion 37, ejection mechanism 40, ejection plate 41, circular through hole 42, push plate 43, ejection push rod 44. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Please see Figure 1-6 In this embodiment of the present invention, a multi-cavity cup lid injection mold includes an upper mold body 10 and a lower mold body 20 that cooperate with each other. A mold core assembly 30 and an ejection mechanism 40 connected to the mold core assembly 30 are provided between the upper mold body 10 and the lower mold body 20.

[0025] The mold core assembly 30 includes an upper mold core 31 and multiple lower mold cores 32 docking at the lower end of the upper mold core 31. The lower end of the upper mold core 31 has multiple arrayed product outer contouring structures 33 formed on it. The lower mold cores 32 have product inner contouring structures 34 docking with the product outer contouring structures 33 formed on them. Multiple arrayed positioning slots 21 are provided on the lower mold body 20. Positioning blocks 35 docking with the positioning slots 21 are formed at the lower end of the lower mold cores 32. The lower mold cores 32 are connected to the positioning slots 21 via the positioning blocks 35. The slot 21 is used to position and install on the lower mold body 20. The ejector mechanism 40 is provided with an ejector plate 41 installed on the lower mold body 20. The ejector plate 41 has multiple circular through holes 42 arranged in an array. Multiple lower mold cores 32 are sequentially connected to the multiple circular through holes 42, so that a cavity for molding the cup lid is formed between the outer contour structure 33 of the product, the inner contour structure 34 of the product and the ejector plate 41. A glue injection mechanism is provided on the upper mold body 10 that extends into the cavity along the upper mold core 31.

[0026] During the injection molding process, the upper mold body 10 and the lower mold body 20 are closed. At this time, the lower mold core 32 is precisely positioned by the positioning insert 35 and the positioning slot 21 of the lower mold body 20. The outer contour structure 33 of the upper mold core 31 and the inner contour structure 34 of the lower mold core 32 are connected to each other. Together with the ejector plate 41, they form a cavity for molding the cup lid. Then, the injection mechanism injects the high-temperature molten plastic into the cavity along the upper mold core 31. The plastic cools and solidifies in the cavity to form the cup lid. After molding, the upper mold body 10 and the lower mold body 20 are opened. Then, the ejector plate 41 of the ejector mechanism 40 moves upward. The edge of the circular through hole 42 on the ejector plate 41 applies an ejection force to the edge of the molded cup lid, causing the cup lid to detach from the lower mold core 32, completing one production cycle. The above steps can be repeated for mass production.

[0027] Therefore, through the cooperation of the positioning insert 35 and the positioning slot 21, the lower mold core 32 can be easily positioned and installed on the lower mold body 20. Furthermore, the ejector plate 41 of the ejector mechanism 40 cooperates with the lower mold core 32 and the upper mold core 31 to form a cavity and realize the ejection function. While ensuring efficient production of multiple cavities in one mold, the entire molded cup cap can be demolded simultaneously through only one ejector plate 41, reducing the need for complex ejection structures and lowering mold costs. Moreover, the lower mold core 32 is positioned and installed on the lower mold body 20 by the cooperation of the positioning insert 35 and the positioning slot 21. This structural design is simple. When the product size or shape is required to change and the mold core assembly 30 needs to be replaced, the new lower mold core 32 can still be quickly and accurately installed and fixed through the positioning insert 35 and the positioning slot 21. This greatly improves the mold's adaptability to different product requirements and significantly enhances the mold's versatility and flexibility of use.

[0028] Please see Figure 5-6 Based on the above technical solution, it is further proposed that the lower mold body 20 is provided with multiple circular bosses 22 corresponding to the lower mold core 32, and positioning slots 21 are provided on the circular bosses 22 so that the lower mold core 32 is mated to the circular bosses 22. An annular groove 23 is provided on the circular bosses 22 surrounding the positioning slots 21, and screw connection holes 24 are provided on the circular bosses 22 at positions other than the annular grooves 23. A threaded hole 36 is provided at the lower end of the lower mold core 32 to mate with the screw connection holes 24. The lower mold core 32 is screwed to the circular bosses 22 through the screw connection holes 24 and the threaded hole 36. By adding circular bosses 22 to the lower mold body 20 and providing positioning slots 21 thereon, the lower mold core 32 can be precisely mated to the circular bosses 22. This design not only further optimizes the positioning accuracy of the lower mold core 32, but also allows the circular boss 22 to serve as an independent load-bearing structure, sharing the pressure on the lower mold core 32 during injection molding and enhancing the overall structural stability of the mold. The annular groove 23 surrounding the positioning slot 21 can accommodate any overflow or impurities that may occur during mold opening and closing, preventing them from affecting the positioning and assembly accuracy of the lower mold core 32. It also facilitates cleaning and maintenance. Simultaneously, the lower mold core 32 is securely connected to the circular boss 22 via screw connection holes 24 and threaded holes 36, ensuring a firm and reliable installation of the lower mold core 32. This effectively prevents displacement or loosening of the lower mold core 32 under injection pressure and facilitates easy disassembly and assembly during mold repair and replacement, significantly improving the practicality and maintenance convenience of the mold.

[0029] Please see Figure 1-2Based on the above technical solution, the upper mold body 10 is further proposed to include a panel 101, a hot runner plate 102 installed at the lower end of the panel 101, and an upper mold plate 103 installed at the lower end of the hot runner plate 102. The upper mold core 31 is embedded in the upper mold plate 103. The glue injection mechanism includes a main runner bushing 104 set on the panel 101 and connected to the hot runner plate 102, and a hot nozzle 105 embedded in the upper mold core 31 and connected to the hot runner plate 102. The hot nozzle 105 is connected to the cavity. This allows the plastic melt to be uniformly and efficiently transported to the cavity through the hot runner plate 102. The hot nozzle 105 is embedded in the upper mold core 31 and directly connected to the cavity, which can accurately control the glue injection position and flow rate, and ensure the quality of the cup lid molding. The lower mold body 20 includes a base plate 201, a square plate 202 mounted on the base plate 201, and a lower mold plate 203 mounted on the square plate 202. The base plate 201 and the lower mold plate 203 form an active space through the square plate 202, providing movement space for the push plate 43 of the ejection mechanism 40. The ejection mechanism 40 is also provided with a push plate 43 that is guided and connected between the lower mold plate 203 and the base plate 201, and an ejection push rod 44 that is driven and connected between the push plate 43 and the ejection plate 41. The connection design of the ejection push rod 44 and the ejection plate 41 makes the ejection action more stable and accurate, avoiding damage to the cup lid due to ejection deviation. The ejection plate 41 is guided and connected to the lower mold plate 203 through the ejection push rod 44, which enhances the stability and reliability of the ejection mechanism 40. The lower mold plate 203 is mated and cooperates with the upper mold plate 103, and the lower mold core 32 is mounted on the lower mold plate 203.

[0030] Please see Figure 3-5 Based on the above technical solution, it is further proposed that the lower end of the upper mold core 31 is formed with a sloping protrusion 37, and the lower mold plate 203 is provided with a sloping groove 25 that engages with the sloping protrusion 37. The upper mold core 31 and the lower mold plate 203 are guided and connected through the sloping protrusion 37 and the sloping groove 25, which can achieve automatic and precise positioning during the mold closing process, effectively avoiding problems such as flash and dimensional deviation caused by misalignment of the upper and lower molds, and improving the forming accuracy of the cup lid. In addition, a wear-resistant plate 26 is provided between the sloping protrusion 37 and the sloping groove 25, which can withstand the friction generated by frequent mold opening and closing and protect the main structure of the mold. The outer wall of the lower mold core 32 and the inner wall of the circular through hole 42 are both inclined surfaces, so that the ejector plate 41 can restrict the lower mold core 32 on the lower mold body 20. This prevents the lower mold core 32 from loosening or shifting due to the ejection force, ensuring the stability and reliability of the ejection process, thereby improving the overall operating efficiency of the mold and the product quality.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A multi-cavity cup lid injection mold, characterized by, It includes an upper mold body (10) and a lower mold body (20) that cooperate with each other, and a mold core assembly (30) and an ejection mechanism (40) that docks with the mold core assembly (30) are provided between the upper mold body (10) and the lower mold body (20); wherein, The mold core assembly (30) includes an upper mold core (31) and multiple lower mold cores (32) mating at the lower end of the upper mold core (31). The lower end of the upper mold core (31) is formed with multiple arrayed product outer contour structures (33), and the lower mold cores (32) are formed with product inner contour structures (34) mating with the product outer contour structures (33). Multiple arrayed positioning slots (21) are provided on the lower mold body (20), and positioning blocks (35) mating with the positioning slots (21) are formed at the lower end of the lower mold cores (32). The lower mold cores (32) are connected to the positioning slots (21) via the positioning blocks (35) and... The positioning slot (21) is used to position and install on the lower mold body (20). The ejection mechanism (40) is provided with an ejection plate (41) installed on the lower mold body (20). The ejection plate (41) has multiple circular through holes (42) arranged in an array. Multiple lower mold cores (32) are connected in sequence in the multiple circular through holes (42), so that a cavity for molding the cup lid is formed between the outer contour structure (33), the inner contour structure (34), and the ejection plate (41). A glue injection mechanism is provided on the upper mold body (10) that extends into the cavity along the upper mold core (31).

2. The multi-cavity cup lid injection mold of claim 1, wherein, The lower mold body (20) is provided with a plurality of circular bosses (22) corresponding to the lower mold core (32). The positioning slot (21) is provided on the circular bosses (22) so that the lower mold core (32) is mated on the circular bosses (22). An annular groove (23) is provided on the circular bosses (22) surrounding the positioning slot (21). A screw connection hole (24) is provided on the circular bosses (22) at a position other than the annular groove (23). A threaded hole (36) is provided at the lower end of the lower mold core (32) and mated with the screw connection hole (24). The lower mold core (32) is screwed onto the circular bosses (22) through the screw connection hole (24) and the threaded hole (36).

3. The multi-cavity cup lid injection mold of claim 1, wherein, The upper mold body (10) includes a panel (101), a hot runner plate (102) installed at the lower end of the panel (101), and an upper template (103) installed at the lower end of the hot runner plate (102). The upper mold core (31) is embedded in the upper template (103). The glue injection mechanism includes a main runner bushing (104) set on the panel (101) and connected to the hot runner plate (102) and a hot nozzle (105) embedded in the upper mold core (31) and connected to the hot runner plate (102). The hot nozzle (105) is connected to the cavity.

4. The multi-cavity cup lid injection mold of claim 3, wherein, The lower mold body (20) includes a base plate (201), a square plate (202) mounted on the base plate (201), and a lower template (203) mounted on the square plate (202). The base plate (201) and the lower template (203) form an active space through the square plate (202). The ejection mechanism (40) is also provided with a push plate (43) that is guided and connected between the lower template (203) and the base plate (201) and an ejection push rod (44) that is driven and connected between the push plate (43) and the ejection plate (41). The ejection plate (41) is guided and connected to the lower template (203) through the ejection push rod (44). The lower template (203) is mated and cooperated with the upper template (103). The lower mold core (32) is mounted on the lower template (203).

5. A multi-cavity cup lid injection mold according to claim 4, wherein, The lower end of the upper mold core (31) is formed with a sloping protrusion (37), and the lower template (203) is provided with a sloping groove (25) that connects to the sloping protrusion (37). The upper mold core (31) and the lower template (203) are guided and connected through the sloping protrusion (37) and the sloping groove (25), and a wear-resistant plate (26) is provided between the sloping protrusion (37) and the sloping groove (25).

6. A multi-cavity cup lid injection mold according to claim 5, wherein, The outer wall of the lower mold core (32) and the inner wall of the circular through hole (42) are both inclined surfaces, so that the ejector plate (41) can restrict the lower mold core (32) on the lower mold body (20).

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