A mold structure of a yogurt cup

Abstract

The utility model relates to mould technical field, concretely relates to a mould structure of yoghourt cup, including the hot runner board, fixed mould plate backing plate, fixed mould plate, push block, movable platen, movable platen support plate and bottom plate that set up in sequence, install needle valve hot runner in hot runner board, fixed mould plate backing plate inlay cooling water jacket assembly, and cooling water jacket assembly surrounds the hot nozzle area of needle valve hot runner, the welding forming process of integral type cooling water jacket has improved the cooling efficiency of hot nozzle significantly, has eliminated gate rubber silk and peeling defect completely, and simultaneously combines three -fold broken vacuum technology - dish type elastic sheet momentary elastic break before mould adsorption, adjustable airflow channel precision injection break behind mould vacuum, delay push block ejection prevents secondary adsorption, systemic solution thin -walled yoghourt cup demolding deformation and sticking mould problem, the time -sequence control chain of fast response makes product demolding intact rate improve greatly, mould abnormal failure rate tends to zero.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a mold structure for a yogurt cup. Background Technology

[0002] Injection molds are the core manufacturing tools for the mass production of plastic products. They are essentially precision steel tools with cavities that perfectly match the shape of the product. During production, the mold is installed on an injection molding machine, and molten plastic (thermoplastic or thermosetting) is injected into the closed cavity under high pressure and high speed. After filling the cavity, it is cooled (thermoplastic) or heated and solidified (thermosetting). Then the mold opens, and the molded plastic product is ejected through the ejection mechanism, completing one molding cycle.

[0003] Injection molds are widely used and are key equipment for achieving efficient, precise, and mass production of plastic products. However, they still have certain problems: 1) Low heat dissipation efficiency and short service life of the hot nozzle: leakage of the sealing ring and insufficient cooling in the hot nozzle area lead to problems such as glue residue, peeling, and steel cracking at the gate; 2) Vacuum adsorption of thin-walled products leads to poor demolding, and product deformation or failure to eject can damage the mold; 3) When a vacuum is generated in the front mold, the product adheres to the front mold cavity. Therefore, in view of the above situation, there is an urgent need to develop a mold structure for yogurt cups to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content

[0004] The purpose of this invention is to provide a mold structure for a yogurt cup to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold structure for a yogurt cup, comprising a hot runner plate, a fixed template pad, a fixed template, a push block, a moving template, a moving template support plate, and a bottom plate arranged sequentially, wherein a needle valve hot runner is installed inside the hot runner plate;

[0006] The template pad is embedded with a cooling water jacket assembly, which surrounds the hot nozzle area of ​​the needle valve hot runner.

[0007] The moving template is equipped with a cavity vacuum prevention device, which is positioned by the moving template support plate and the base plate.

[0008] The fixed template is equipped with disc-shaped spring mechanisms on both sides.

[0009] Specifically, the ISO welding process of the cooling water jacket assembly significantly improves the cooling efficiency and service life of the hot runner and hot nozzle area of ​​the needle valve, reduces product gate defects, and shortens the injection molding cycle; the anti-cavity vacuum device introduces airflow for 0.5-1 seconds during mold opening to break the vacuum adsorption, and the push block enables non-destructive demolding of the thin-walled cup; combined with the instantaneous spring-loaded action of the disc-shaped spring mechanism on both sides of the fixed platen, the three technologies work together to solve the risks of yogurt cup sticking, deformation, and compression molding, improve the yield rate, and reduce mold maintenance costs.

[0010] Preferably, the cooling water jacket assembly is formed by welding an upper water channel insert and a lower water channel insert. The cooling water jacket assembly has a heat nozzle mating cavity inside. A spiral cooling water channel a is formed between the upper water channel insert and the lower water channel insert. The welding joint surfaces of the upper water channel insert and the lower water channel insert are formed into an integral sealed structure by ISO standard welding process.

[0011] Specifically, the ISO welding process of the upper and lower water channel inserts achieves high-precision sealing of the hot nozzle mating cavity, ensuring that the spiral cooling water channel a tightly surrounds the hot nozzle area of ​​the needle valve hot runner, thereby improving the cooling efficiency of the hot nozzle and effectively eliminating defects such as glue threads and peeling at the yogurt cup pouring point. The welded overall structure avoids the aging risk of traditional sealing rings, extends the service life of the water jacket, and reduces the abnormal downtime rate of the mold.

[0012] Preferably, the cavity vacuum prevention device includes:

[0013] Outer inserts fixed to the moving template;

[0014] An axially movable insert;

[0015] The inlay is linked to the base plate;

[0016] An airflow channel of 0.3-0.8mm is formed between the outer and inner inlays;

[0017] The inner insert has a spiral cooling water channel b.

[0018] Specifically, the sliding fit between the outer insert and the inner insert forms an adjustable airflow channel of 0.3-0.8mm. At the moment of mold opening, the inner insert moves backward in conjunction with the base plate to guide the airflow. Combined with the rapid cooling capability of the spiral cooling water channel b of the inner insert, the vacuum adsorption of the yogurt cup cavity is broken in milliseconds, reducing the demolding deformation rate of the thin-walled cup. The adjustable airflow channel design adapts to different cup sizes, reduces airflow energy consumption, and avoids product indentation defects caused by traditional ejector pins.

[0019] Preferably, a vacuum valve is installed on the outside of the moving template, and the airflow channel is connected to the vacuum valve outside the mold. The vacuum valve is configured to be triggered to open when the mold is opened; the blowing time is set to 0.5-1 seconds; and the airflow is ejected through the front end of the inner insert.

[0020] Specifically, through the intelligent linkage control of the vacuum valve and the mold opening action, the airflow is ensured to be accurately ejected from the front end of the inner insert at the moment of mold opening. The 0.5-1 second adjustable blowing time matches the thin-walled characteristics of the yogurt cup, so that the cup body is evenly separated from the cavity surface. Combined with the directional jet design of the airflow channel, the vacuum breaking efficiency is improved, completely eliminating the risk of cup bottom adsorption and deformation, while reducing the consumption of compressed air and avoiding mechanical damage to the cup mouth caused by traditional ejection mechanisms.

[0021] Preferably, the base plate drives the inner insert to move axially, and when the mold opens, it drives the inner insert to move backward to open the airflow channel, and when the mold closes, it pushes the inner insert to move forward to close the airflow channel.

[0022] Specifically, through direct mechanical linkage between the base plate and the insert, the insert moves backward to precisely open the airflow channel at the moment of mold opening, and moves forward to close the channel during mold closing, achieving zero-delay action and improving the airflow response speed of yogurt cup demolding. The mechanical synchronization design eliminates the signal transmission lag of traditional solenoid valve air control, ensuring that the opening and closing accuracy of the airflow channel reaches ±0.02mm per mold, improving the demolding yield of thin-walled cups, while avoiding the risk of mold damage caused by foreign objects entering the channel after mold closing, thus reducing the equipment failure rate.

[0023] Preferably, the disc-shaped spring mechanism includes:

[0024] A spring slot is provided on the side of the fixed template;

[0025] The disc-shaped spring, embedded in the spring slot, is configured to provide a spring-opening stroke of 1±0.2mm at the moment of mold opening.

[0026] Specifically, through the pre-compression design of the disc-shaped spring in the spring slot, a precise spring-opening stroke of 1±0.2mm is achieved at the moment of mold opening, enabling the fixed mold plate to complete the physical vacuum breaking action within 0.01 seconds, completely eliminating the problem of mold sticking to the yogurt cup mouth caused by vacuum adsorption; the spring-opening stroke tolerance control ensures the synchronization rate of separation between the cup body and the cavity, avoiding the cup wall tearing defects caused by the stroke deviation of the traditional spring-opening mechanism. Combined with the anti-cavity vacuum device, a double vacuum breaking guarantee is formed, which improves the demolding integrity rate of thin-walled yogurt cups and reduces the mold abnormal sticking failure rate to zero.

[0027] Preferably, the timing of the pusher's action is set to start after the anti-cavity vacuum device has completed blowing.

[0028] Specifically, by setting the timing logic for the pusher to start after the anti-cavity vacuum device completes the blowing, it ensures that the airflow of 0.5-1 seconds completely removes the yogurt cup from the cavity surface, and then the pusher performs mechanical ejection, eliminating the airflow interference and cup tilting risk caused by traditional synchronous ejection; the timing delay control improves the uniformity of the demolding force on the thin-walled cup, completely avoids cup mouth curling deformation and cup bottom vacuum secondary adsorption phenomenon, improves product integrity rate, and reduces pusher wear rate.

[0029] Compared with the prior art, the present invention provides a mold structure for a yogurt cup, which has the following beneficial effects:

[0030] The integrated cooling water jacket welding process significantly improves the cooling efficiency of the hot nozzle, completely eliminating defects such as sprue glue and peeling. At the same time, it combines triple vacuum breaking technology—the instantaneous pop-out of the disc-shaped spring to break the front mold adsorption, the precise jetting of the adjustable airflow channel to break the vacuum of the rear mold, and the delayed push block ejection to prevent secondary adsorption—systematically solving the problems of demolding deformation and sticking of thin-walled yogurt cups. The fast-response timing control chain greatly improves the product demolding integrity rate, and the mold abnormality failure rate is close to zero. Compared with traditional molds, it reduces energy consumption and shortens the production cycle, achieving a dual breakthrough of high yield and ultra-low maintenance cost. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0032] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0033] Figure 2 This is an exploded view of the entire utility model;

[0034] Figure 3 This utility model Figure 2 Side view;

[0035] Figure 4 This is a partial cross-sectional view of the entire utility model;

[0036] Figure 5 This is a side longitudinal sectional view of the entire utility model;

[0037] Figure 6 This is a partial cross-sectional view of the cooling water jacket assembly of this utility model;

[0038] Figure 7 This is a side longitudinal sectional view of the anti-vacuum device for the cavity of this utility model;

[0039] Figure 8 This is a partial cross-sectional view of the disc-shaped spring mechanism of this utility model.

[0040] In the diagram: 1. Hot runner plate; 2. Fixed template pad; 3. Fixed template; 4. Push block; 5. Moving template; 6. Moving template support plate; 7. Base plate; 8. Cooling water jacket assembly; 801. Upper water channel insert; 802. Lower water channel insert; 803. Hot nozzle mating cavity; 804. Spiral cooling water channel a; 9. Anti-cavity vacuum device; 901. Outer insert; 902. Inner insert; 903. Airflow channel; 904. Spiral cooling water channel b; 10. Disc spring mechanism; 1001. Spring slot; 1002. Disc spring; 11. Vacuum valve; 12. Needle valve hot runner. Detailed Implementation

[0041] 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.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Example:

[0044] Please see Figures 1-8 This utility model provides a technical solution: a mold structure for a yogurt cup, including a hot runner plate 1, a fixed template pad 2, a fixed template 3, a push block 4, a moving template 5, a moving template support plate 6 and a bottom plate 7 arranged in sequence, and a needle valve hot runner 12 installed in the hot runner plate 1;

[0045] The template pad 2 is embedded with a cooling water jacket assembly 8, which surrounds the hot nozzle area of ​​the needle valve hot runner 12.

[0046] The moving template 5 is equipped with an anti-cavity vacuum device 9, which is positioned by the moving template support plate 6 and the base plate 7.

[0047] The fixed template 3 is provided with disc-shaped spring mechanism 10 on both sides.

[0048] Specifically, the ISO welding process of the cooling water jacket assembly 8 significantly improves the cooling efficiency and service life of the hot nozzle area of ​​the needle valve hot runner 12, reduces product gate defects, and shortens the injection molding cycle; the anti-cavity vacuum device 9 introduces airflow for 0.5-1 seconds during mold opening to break the vacuum adsorption, and works with the push block 4 to achieve non-destructive demolding of the thin-walled cup; combined with the instantaneous spring-loaded action of the disc-shaped spring mechanism 10 on both sides of the fixed platen 3, the three technologies work together to solve the risks of yogurt cup sticking, deformation, and compression molding, improve the yield rate, and reduce mold maintenance costs.

[0049] Preferably, the cooling water jacket assembly 8 is formed by welding an upper water channel insert 801 and a lower water channel insert 802. The cooling water jacket assembly 8 has a heat nozzle mating cavity 803 inside. A spiral cooling water channel a804 is formed between the upper water channel insert 801 and the lower water channel insert 802. The welding joint surfaces of the upper water channel insert 801 and the lower water channel insert 802 are formed into an integral sealed structure by ISO standard welding process.

[0050] Specifically, the high-precision sealing of the hot nozzle mating cavity 803 is achieved through the ISO welding process of the upper water channel insert 801 and the lower water channel insert 802, ensuring that the spiral cooling water channel a804 tightly surrounds the hot nozzle area of ​​the needle valve hot runner 12, thereby improving the cooling efficiency of the hot nozzle and effectively eliminating defects such as glue threads and peeling at the yogurt cup pouring point. The welded overall structure avoids the aging risk of traditional sealing rings, extends the service life of the water jacket, and reduces the abnormal downtime rate of the mold.

[0051] Preferably, the cavity vacuum prevention device 9 includes:

[0052] The outer insert 901 is fixed to the moving template 5;

[0053] Axially movable insert 902;

[0054] Inlay 902 is linked to base plate 7;

[0055] An airflow channel 903 of 0.3-0.8 mm is formed between the outer insert 901 and the inner insert 902;

[0056] The inner insert 902 has a spiral cooling water channel b904 inside.

[0057] Specifically, the sliding fit between the outer insert 901 and the inner insert 902 forms an adjustable airflow channel 903 of 0.3-0.8mm. At the moment of mold opening, the inner insert 902 moves backward in conjunction with the base plate 7 to guide the airflow. Combined with the rapid cooling capability of the spiral cooling water channel b904 of the inner insert, the vacuum adsorption of the yogurt cup cavity is broken in milliseconds, which reduces the demolding deformation rate of the thin-walled cup. The adjustable airflow channel design adapts to different cup sizes, reduces airflow energy consumption, and avoids product indentation defects caused by traditional ejector pins.

[0058] Preferably, a vacuum valve 11 is installed on the outside of the moving template 5, and the airflow channel 903 is connected to the vacuum valve 11 outside the mold. The vacuum valve 11 is configured to be triggered to open when the mold is opened; the blowing time is set to 0.5-1 seconds; and the airflow is ejected through the front end of the inner insert 902.

[0059] Specifically, through the intelligent linkage control of vacuum valve 11 and mold opening action, the airflow is ensured to be accurately ejected from the front end of the inner insert 902 at the moment of mold opening. The 0.5-1 second adjustable blowing time matches the thin-walled characteristics of the yogurt cup, so that the cup body is evenly separated from the cavity surface. Combined with the directional injection design of airflow channel 903, the vacuum breaking efficiency is improved, completely eliminating the risk of cup bottom adsorption deformation, while reducing compressed air consumption and avoiding mechanical damage to the cup mouth caused by traditional ejection mechanism.

[0060] Preferably, the base plate 7 drives the inner insert 902 to move axially. When the mold is opened, the inner insert 902 moves backward to open the airflow channel 903. When the mold is closed, the inner insert 902 is pushed forward to close the airflow channel 903.

[0061] Specifically, through the direct mechanical linkage between the base plate 7 and the insert 902, the insert 902 moves backward to precisely open the airflow channel 903 at the moment of mold opening, and moves forward to close the channel during mold closing, achieving zero-delay action and improving the airflow response speed for demolding the yogurt cup. The mechanical synchronization design eliminates the signal transmission lag of traditional solenoid valve air control, ensuring that the opening and closing accuracy of the airflow channel 903 reaches ±0.02mm per mold, improving the demolding yield of thin-walled cups, while avoiding the risk of mold damage caused by foreign objects entering the channel after mold closing, thus reducing the equipment failure rate.

[0062] Preferably, the disc-shaped spring mechanism 10 includes:

[0063] Spring slot 1001 is formed on the side of fixed template 3;

[0064] The disc-shaped spring 1002, which is embedded in the spring slot 1001, is configured to provide a spring-opening stroke of 1±0.2mm at the moment of mold opening.

[0065] Specifically, through the pre-compression design of the disc-shaped spring 1002 within the spring groove 1001, a precise spring-opening stroke of 1±0.2mm is achieved at the moment of mold opening, enabling the fixed template 3 to complete the physical vacuum breaking action within 0.01 seconds, completely eliminating the problem of cup sticking to the mold mouth caused by vacuum adsorption in yogurt cups; the spring-opening stroke tolerance control ensures the synchronization rate of separation between the cup body and the cavity, avoiding cup wall tearing defects caused by stroke deviation of traditional spring-opening mechanisms, and forming a double vacuum breaking guarantee with the anti-cavity vacuum device 9, thereby improving the demolding integrity rate of thin-walled yogurt cups and reducing the mold abnormal sticking failure rate to zero.

[0066] Preferably, the timing of the pusher 4 is set to start after the anti-cavity vacuum device 9 completes the blowing.

[0067] Specifically, by setting the timing logic for push block 4 to start after the anti-cavity vacuum device 9 completes blowing, the airflow action of 0.5-1 seconds ensures that the yogurt cup body is completely detached from the cavity surface, and then push block 4 performs mechanical ejection, eliminating the airflow interference and cup body tilting risk caused by traditional synchronous ejection; the timing delay control improves the uniformity of the demolding force of the thin-walled cup body, completely avoids the cup mouth curling deformation and the cup bottom vacuum secondary adsorption phenomenon, improves the product integrity rate, and at the same time reduces the wear rate of push block 4.

[0068] Working principle: During the mold closing and injection molding stage, the molten material is injected into the cavity through the needle valve hot runner 12. At this time, the spiral cooling water channel a804 of the cooling water jacket assembly 8 continuously cools the hot nozzle area to prevent the gate from overheating and cracking. At the moment of mold opening, the disc springs 1002 of the disc spring mechanism 10 on both sides of the fixed platen 3 first spring open by 1±0.2mm to break the vacuum adsorption of the front mold. At the same time, the bottom plate 7 moves backward, driving the inner insert 902 of the anti-cavity vacuum device 9 to move axially backward by 0.5mm, opening the 0.3-0.8mm airflow channel 903. The vacuum valve 11 opens simultaneously and sprays airflow for 0.5-1 seconds, causing the yogurt cup to detach from the cavity surface. The spiral cooling water channel b904 in the inner insert 902 controls the insert temperature in real time to ensure stable airflow. After the blowing is completed, the push block 4 starts after a delay to smoothly eject the completely detached cup. Finally, when the mold closes, the bottom plate 7 pushes the inner insert 902 forward to close the airflow channel 903, completing the fully automatic production cycle.

[0069] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A mold structure for a yogurt cup, comprising a hot runner plate (1), a fixed template pad (2), a fixed template (3), a push block (4), a movable template (5), a movable template support plate (6), and a base plate (7) arranged sequentially, wherein a needle valve hot runner (12) is installed inside the hot runner plate (1), characterized in that: The fixed template pad (2) is fitted with a cooling water jacket assembly (8), which surrounds the hot nozzle area of ​​the needle valve hot runner (12); The moving template (5) is provided with a cavity vacuum prevention device (9), which is positioned by the moving template support plate (6) and the base plate (7); The fixed template (3) is provided with disc-shaped spring mechanism (10) on both sides.

2. The mold structure for a yogurt cup according to claim 1, characterized in that: The cooling water jacket assembly (8) is formed by welding an upper water channel insert (801) and a lower water channel insert (802). The interior of the cooling water jacket assembly (8) is provided with a hot nozzle mating cavity (803). A spiral cooling water channel a (804) is provided between the upper water channel insert (801) and the lower water channel insert (802).

3. The mold structure for a yogurt cup according to claim 1, characterized in that: The cavity vacuum protection device (9) includes: An outer insert (901) is fixed to the moving template (5); Axially movable insert (902); The inlay (902) is linked with the base plate (7); An airflow channel (903) of 0.3-0.8 mm is formed between the outer insert (901) and the inner insert (902). The insert (902) is provided with a spiral cooling water channel b (904).

4. The mold structure for a yogurt cup according to claim 3, characterized in that: A vacuum valve (11) is installed on the outside of the moving template (5), and the airflow channel (903) is connected to the vacuum valve (11) outside the mold.

5. The mold structure for a yogurt cup according to claim 1, characterized in that: The base plate (7) drives the inner insert (902) to move axially.

6. The mold structure for a yogurt cup according to claim 1, characterized in that: The disc-shaped spring mechanism (10) includes: A spring slot (1001) is formed on the side of the fixed template (3). A disc-shaped spring (1002) is embedded in the spring slot (1001).

7. The mold structure for a yogurt cup according to claim 1, characterized in that: The timing of the pusher (4) is set to start after the anti-cavity vacuum device (9) completes the blowing.

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