Cold and hot open type hot runner mold

Abstract

The utility model discloses a cold and hot open type hot runner mold which comprises a fixed mold seat plate, a runner plate is arranged below the fixed mold seat plate, a runner is arranged in the runner plate, a plurality of sprue bushes are arranged below the runner plate, and the runner plate and the plurality of sprue bushes are embedded and fixed on a support plate; a central channel is formed in the middle of the sprue bush, the bottom end is communicated with the mold runner, and the top end is hermetically butted with a discharge hole in the lower surface of the runner plate. The failure rate in the hot runner production can be effectively reduced, the structure is simple and reliable, the manufacturing cost is low, and the production and manufacturing requirements of the hot runner structure in the current market can be met. And the defects in the production of the conventional hot runner structure can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to mould technical field, especially a cold and hot open hot runner mould. BACKGROUND

[0002] In the use process of the conventional hot runner mould, once the mould leaks material, the hot nozzle is easily tightly wrapped by the leaked raw material. In this case, the heat of the hot nozzle is absorbed by the raw material in large quantities, causing its temperature to drop sharply and failing to maintain within the normal production temperature range, thereby causing the mould to fail to eject material smoothly, seriously affecting the forming quality and production efficiency of the product. Moreover, in the subsequent cleaning work, since the raw material has solidified and is tightly attached to the hot nozzle and other key parts of the mould, the cleaning difficulty is extremely great, and a large amount of time and energy is required to carry out meticulous cleaning work, which not only increases the production cost, but also seriously delays the normal production progress.

[0003] Chinese patent publication number: CN218462835U, publication date: February 10, 2023, discloses a Chinese patent named PVC pipe fitting hot runner injection mould, which comprises a fixed mould body and a movable mould body, a flow channel and a forming cavity are arranged between the fixed mould body and the movable mould body, the forming cavity is located at both ends of the flow channel and communicates with the flow channel, a hot nozzle for injecting raw material into the flow channel is further arranged on the fixed mould body, a center passage is arranged in the middle of the hot nozzle, and a heating component is arranged on the hot nozzle. The patent uses the traditional hot nozzle to inject raw material, when the mould leaks material, it cannot eject material, increasing the maintenance cost and downtime, delaying production. UTILITY MODEL CONTENTS

[0004] The utility model provides a cold and hot open hot runner mould, through with the nozzle bushing instead of the hot nozzle, reduce the failure rate in the production of hot runner, convenient maintenance, satisfy the production, the production requirement of hot runner structure and avoid the deficiency in the production of conventional hot runner structure.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a cold and hot open hot runner mould, comprising a fixed mould seat plate, a flow channel plate is arranged below the fixed mould seat plate, a flow channel is arranged in the flow channel plate, a plurality of nozzle bushings are arranged below the flow channel plate, and the flow channel plate and the plurality of nozzle bushings are embedded in the support plate; a center passage is arranged in the middle of the nozzle bushing, the bottom end thereof communicates with the mould flow channel, and the top end thereof sealingly connects with the discharge port on the lower surface of the flow channel plate. The failure rate in the production of hot runner can be effectively reduced, the structure is simple and reliable, the manufacturing cost is low, the production and manufacturing requirements of the hot runner structure on the market can be met, and the deficiencies in the production of conventional hot runner structure can be avoided.

[0006] Preferably, the fixed mold base plate is provided with a positioning ring for fixing the nozzle. During production, the injection molding machine nozzle is aligned with the center of the positioning ring, and the material of the injection molding machine is injected from the nozzle into the flow channel plate heated to a certain temperature, and the positioning ring is arranged on the mold symmetry axis. The positioning ring can ensure the precise docking of the injection molding machine nozzle and the mold, improve the stability of the injection molding process, reduce the leakage of raw materials caused by inaccurate docking and other problems, thereby ensuring the stability of product quality and reducing the rate of defective products.

[0007] Preferably, the positioning ring is connected to the fixed mold base plate by a fixing bolt. The positioning ring is arranged on the upper surface of the fixed mold base plate. The use of a fixing bolt connection makes the connection between the positioning ring and the fixed mold base plate more firm and reliable, effectively avoiding displacement of the positioning ring due to factors such as vibration during production, further improving the service life of the mold and the stability of the production process, and reducing downtime for maintenance caused by loose positioning rings.

[0008] Preferably, the mold flow channel is provided with a plurality of forming cavities at both ends, and the plurality of forming cavities are in communication with the mold flow channel. The raw material in the mold flow channel flows to the forming cavities and fills the entire forming cavities. Such a structure design can realize multi-cavity simultaneous injection molding, greatly improving production efficiency and meeting the needs of large-scale production, while also being conducive to ensuring uniform filling of raw materials in each forming cavity, improving the dimensional accuracy and consistency of products, and improving the overall quality of products.

[0009] Preferably, the fixed mold base plate is fixed by a bolt and a support plate, and a plurality of spacers are arranged between the fixed mold plate and the support plate.

[0010] Preferably, the spacers are fixed to the upper surface of the flow channel plate by bolts, and the flow channel plate is fixed to the support plate by bolts. The support plate is provided with a rectangular chamber, the flow channel plate is arranged in the rectangular chamber, and the flow channel plate and the inner wall of the rectangular chamber have a certain distance. The flow channel plate and the inner wall of the rectangular chamber have a certain distance. This structure not only ensures the stable connection between the flow channel plate and the support plate, but also provides space for the thermal expansion of the flow channel plate by reserving a certain distance between the flow channel plate and the inner wall of the rectangular chamber, avoiding deformation or damage of the flow channel plate due to thermal expansion, prolonging the service life of the mold, and also being conducive to maintaining the uniformity of the temperature in the flow channel, improving the injection molding quality.

[0011] Preferably, the nozzle sleeve is used to inject raw materials into the mold runner, and the molding cavity is arranged below the nozzle sleeve on both sides. The top end of the nozzle sleeve is arranged in the rectangular cavity between the lower surface of the runner plate and the support plate. So that the raw materials can flow more smoothly from the nozzle sleeve into the mold runner, and be evenly distributed into each molding cavity, reducing the accumulation of raw materials in the runner and the production failure caused by the blockage of the runner, improving the continuity and stability of the production process, and facilitating the maintenance and replacement of the nozzle sleeve, reducing the maintenance cost, facilitating the flow and filling of the raw materials in the molding cavity, avoiding the defects such as material shortage or bubbles caused by poor flow of raw materials, and further improving the qualified rate of products.

[0012] Preferably, a front mold core is arranged above the molding cavity, and the front mold core is arranged on both sides of the nozzle sleeve. The front mold core can form the shape of the product together with the molding cavity, ensuring the molding precision and appearance quality of the product.

[0013] Preferably, the upper half of the front mold core is fixed on the core fixing plate, and the core fixing plate is fixed below the support plate through bolts. The bolt fixing mode makes the connection between the front mold core and the core fixing plate, and the connection between the core fixing plate and the support plate more firm, ensures the stability of the front mold core in the production process, avoids the product size deviation caused by the loosening or displacement of the front mold core, improves the size precision and quality stability of the product, and facilitates the disassembly and replacement of the front mold core, facilitating the maintenance and maintenance of the mold.

[0014] Preferably, a fixed mold plate is arranged below the core fixing plate, and the lower half of the front mold core is fixed on the fixed mold plate. The mold runner and the molding cavity are arranged in the fixed mold plate. Integrating the mold runner and the molding cavity in the fixed mold plate is beneficial to maintaining the stability of the internal structure of the mold, improving the service life of the mold, and is also beneficial to realizing the automatic production of the mold, improving the production efficiency and product quality.

[0015] The utility model discloses a cold and hot combined open hot runner mold, through with nozzle sleeve instead of hot nozzle, can effectively reduce the failure rate in hot runner production, simple structure is reliable, and the production cost is low, can satisfy the production, the making requirement of the hot runner structure on the market at present. ACCURACY OF DRAWINGS

[0016] Figure 1 It is a structure schematic diagram of the utility model.

[0017] Figure 2 It is a structure schematic diagram of the runner plate and nozzle sleeve of the utility model.

[0018] Reference signs: 1. forming cavity; 2. mold runner; 3. front mold core; 4. gate sleeve; 5. runner plate; 6. gasket; 7. positioning ring; 8. fixed mold base plate; 9. support plate; 10. core fixing plate; 11. fixed mold plate. DETAILED DESCRIPTION

[0019] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] The cold and hot open hot runner mold of the utility model replaces the hot nozzle with the gate sleeve 4, aiming at solving the high failure rate problem of using the hot nozzle in the traditional hot runner mold. The mold is mainly composed of a fixed mold base plate 8, a runner plate 5, a gate sleeve 4, a support plate 9, a positioning ring 7, a gasket 6, a forming cavity 1, a front mold core 3, a core fixing plate 10 and a fixed mold plate 11 and other important components. The cold and hot open hot runner mold of the utility model has the advantages of simple and reliable structure, low manufacturing cost, convenient maintenance and the like, effectively reduces the failure rate in hot runner production, meets the production and manufacturing requirements of various products, avoids many shortcomings in the production of conventional hot runner structure, not only improves the quality and production efficiency of the products, reduces the production cost and the rate of defective products, but also reduces the maintenance cost and downtime caused by mold failure.

[0021] As Figure 1As shown, the fixed mold base plate 8 is arranged at the top of the entire mold, and the runner plate 5 is arranged below. The fixed mold base plate 8 is provided with a positioning ring 7, which is accurately arranged on the mold symmetry axis and connected to the fixed mold base plate 8 by a fixing bolt. In the production process, the positioning ring 7 plays an important role, and it is a key component to ensure the accurate docking of the injection molding machine nozzle and the mold. When the injection molding machine performs injection molding operation, the nozzle needs to be accurately aligned with the center of the positioning ring 7, and then the material of the injection molding machine can be smoothly injected from the nozzle into the inside of the runner plate 5 which has been heated to a certain temperature. The arrangement of the positioning ring 7 makes the cooperation between the injection molding machine nozzle and the mold more accurate, avoiding various problems that may occur due to inaccurate docking. For example, when the positioning is not accurate, the material injected from the nozzle of the injection molding machine may not accurately enter the runner plate 5, resulting in material leakage and affecting the molding quality of the product. Through the accurate positioning of the positioning ring 7, this risk is greatly reduced, improving the stability of the injection molding process and reducing the rate of defective products. At the same time, the fixed bolt is used to connect the positioning ring 7 and the fixed mold base plate 8, ensuring that the connection between the positioning ring 7 and the fixed mold base plate 8 is more firm and reliable. In the long-term use of the mold, it will inevitably be subjected to various vibrations, and firm connection can effectively prevent the positioning ring 7 from shifting due to vibration, thereby further improving the service life of the mold and reducing the downtime for maintenance caused by the loosening of the positioning ring 7, providing a strong guarantee for continuous production.

[0022] As shown in Figure 1 and Figure 2 , the runner plate 5 is one of the core components of the entire mold, and a flow channel is arranged inside. The runner plate 5 and several gate sleeves 4 are embedded in the support plate 9. The support plate 9 is provided with a rectangular chamber, and the runner plate 5 is arranged in the rectangular chamber and maintains a certain distance with the inner wall of the rectangular chamber. The runner plate 5 is fixed to the support plate 9 by a bolt, ensuring the stable connection between the runner plate 5 and the support plate 9, so that the runner plate 5 will not shake or shift during work, ensuring the stability of the material flow during injection molding. On the other hand, the reserved distance provides space for the thermal expansion of the runner plate 5. During the injection molding process, the runner plate 5 will expand due to heating, and if there is no reserved space, it may cause the runner plate 5 to deform or be damaged, affecting the normal use of the mold. By reserving space, not only the service life of the mold is prolonged, but also the temperature uniformity inside the flow channel is maintained, because the thermal expansion will not have a great impact on the shape and size of the flow channel, thereby improving the injection molding quality.

[0023] As shown in Figure 1 and Figure 2As shown, the bushing 4 plays an important raw material injection function in the mold, the number of which can be selected as 3-point, 4-point, etc. hot runner structure, and the preferred embodiment is a two-point hot runner structure, and the two bushings 4 are evenly distributed below the runner plate 5. The bushing 4 is provided with a central passage, the bottom end is communicated with the mold runner 2, and the top end is sealingly connected with the discharge port on the lower surface of the runner plate 5. The top end of the bushing 4 is arranged in the rectangular cavity between the lower surface of the runner plate 5 and the support plate 9, which makes the raw material flow more smoothly from the bushing 4 into the mold runner 2 and be evenly distributed to each forming cavity 1. Compared with the traditional hot nozzle, the use of the bushing 4 greatly reduces the failure rate in hot runner production, because it has a simple and reliable structure, low manufacturing cost, and can meet the production and manufacturing requirements of the current market hot runner structure, and avoid the shortcomings in the production of conventional hot runner structure. In the injection molding process, after the raw material is injected from the bushing 4, it will flow along the runner in the runner plate 5. Due to the unique design of the bushing 4, the residence and accumulation of the raw material in the runner are reduced, the production failure caused by the runner blockage is reduced, and the continuity and stability of the production process are improved. Moreover, when the bushing 4 has a problem, due to its simple structure, it is easy to maintain and replace, which greatly reduces the maintenance cost.

[0024] As Figure 2As shown, a plurality of molding cavities 1 are provided at both ends of the mold runner 2, which communicate with the mold runner 2. The molding cavities 1 are the places where the products are finally shaped. When the raw materials in the mold runner 2 flow into the molding cavities 1 under the push of pressure, they will fill the entire molding cavities 1, forming the required product shape. This multi-molding cavity 1 design is to realize multi-cavity injection molding, which has significant advantages in large-scale production scenarios. Through the simultaneous work of multiple molding cavities 1, the production efficiency is greatly improved, meeting the needs of large-scale production. At the same time, multi-cavity injection molding is also beneficial to ensure the uniform filling of raw materials in each molding cavity 1, because the raw materials will form a balance between different molding cavities 1 during the flow process, avoiding the uneven distribution of raw materials that may occur in single-cavity injection molding, thereby improving the dimensional accuracy and consistency of the products, and improving the overall quality of the products. During the product molding process, the raw materials will undergo a transformation from a liquid state to a solid state in the molding cavities 1. In this process, since the molding cavities 1 are working simultaneously, the raw materials in each molding cavity 1 can be filled and cooled at the same time, greatly improving production efficiency. Moreover, multi-cavity injection molding ensures that products in different molding cavities have similar molding conditions, improving product consistency and dimensional accuracy. Above the molding cavities 1, a front mold core 3 is provided, which is arranged on both sides of the sprue bush 4. The upper half of the front mold core 3 is fixed on the core fixing plate 10, and the core fixing plate 10 is fixed below the support plate 9 through bolts. The lower half is fixed on the fixed mold plate 11. The arrangement of the front mold core 3 can form the shape of the product together with the molding cavities 1. During the injection molding process, the raw materials will be molded around the front mold core 3 when they fill the molding cavities 1. The precise shape and stable position of the front mold core 3 play a decisive role in the molding accuracy and appearance quality of the product. The bolted connection between the front mold core 3 and the core fixing plate 10, and the core fixing plate 10 and the support plate 9 makes the connection more firm, ensuring the stability of the front mold core 3 during production, avoiding product size deviation caused by loose or displacement of the front mold core 3, and improving the dimensional accuracy and quality stability of the product. Moreover, when the front mold core 3 needs to be maintained or replaced, this bolted connection also facilitates operation, making it easier to maintain and maintain the mold, reducing the difficulty and cost of mold maintenance. Below the core fixing plate 10, a fixed mold plate 11 is provided, and the mold runner 2 and the molding cavities 1 are arranged in the fixed mold plate 11. This integrated design is beneficial to maintaining the stability of the internal structure of the mold, avoiding the structural instability that may occur due to the dispersion of parts, improving the service life of the mold, and facilitating the automation of mold production, improving production efficiency and product quality.

[0025] As Figure 1As shown, a plurality of spacers 6 are provided between the fixed mold plate 11 and the support plate 9, preferably two in this embodiment, which are fixed on the upper surface of the runner plate 5 by bolts. The presence of the spacers 6 is of great significance. It can fine-tune the spacing between various parts of the mold according to actual production needs, ensure the assembly accuracy of the mold, and also play a buffering role to a certain extent, absorbing the vibration and impact force generated during production, further improving the stability and reliability of the mold.

[0026] Working process.

[0027] Before the mold starts working, it first needs to be preheated. The runner plate 5 is heated to a predetermined temperature by external heating equipment to ensure that the raw material maintains good fluidity when it enters the runner plate 5. During the preheating process, the heating temperature needs to be accurately controlled to avoid affecting the performance of the raw material due to excessively high or low temperature. At this time, since a certain space is reserved between the runner plate 5 and the support plate 9, it can better cope with the problem of thermal expansion, ensuring the safety and stability of the heating process.

[0028] When the preparation work is completed, the injection molding operation begins. The injection molding machine injects the raw material into the mold through the nozzle. The nozzle of the injection molding machine is guided by the positioning ring 7 and accurately aligns with the feed port of the mold, injecting the raw material into the preheated runner plate 5. After the raw material enters the runner plate 5, it flows along the runner. After the raw material is ejected from the runner plate 5, it flows into the sprue bushing 4, passes through the central channel of the sprue bushing 4, and then flows out from the sprue bushing 4 to the mold runner 2, and then uniformly enters each molding cavity 1. In this process, the design of the sprue bushing 4 ensures smooth flow of the raw material, reducing the probability of blockage or leakage. Due to the good cooperation between the sprue bushing 4 and the runner plate 5 and the support plate 9, the raw material maintains stable pressure and speed during the flow process, and does not form eddies or stagnation in the runner, ensuring uniform distribution of the raw material.

[0029] As the raw material flows into the molding cavity 1, the front mold core 3 begins to play a role. The raw material will gradually fill the molding cavity 1 and closely fit the shape of the front mold core 3, forming the preliminary shape of the product. The shape and position of the front mold core 3 determine the final appearance and size of the product, so the front mold core 3 needs to maintain high stability during the injection molding process. Since the front mold core 3 is firmly connected to the core fixing plate 10 by bolts, and the core fixing plate 10 is also stably installed below the support plate 9, the front mold core 3 will not shift, ensuring the molding accuracy of the product. During the molding process, the temperature and pressure inside the mold also need to be accurately controlled to ensure that the raw material can fully fill the molding cavity 1, while avoiding damage to the mold or defects in the product due to excessive pressure.

[0030] Finally, the product is cooled while pressure is maintained, and a certain cooling time is required to completely solidify the product. The product is finally formed. During the cooling process, the mold dissipates heat, and the presence of the gasket 6 helps absorb some of the heat.

[0031] Obviously, the above embodiments are merely exemplary and not limiting. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A cold-hot open hot runner mold, comprising a fixed mold base plate, characterized in that, a runner plate is arranged below the fixed mold base plate, a runner is arranged in the runner plate, a plurality of sprue bushings are arranged below the runner plate, and the runner plate and the plurality of sprue bushings are embedded in the support plate; a center passage is arranged in the middle of the sprue bushing, the bottom end of the center passage is communicated with the mold runner, and the top end of the center passage is sealingly connected with the discharge port on the lower surface of the runner plate.

2. The hot and cold open hot runner mold according to claim 1, wherein, A positioning ring for fixing the nozzle is arranged on the fixed mold base plate.

3. A hot and cold open hot runner mold according to claim 2, characterized in that, The positioning ring is connected with the fixed mold base plate through fixing bolts.

4. The hot and cold open hot runner mold according to claim 1, wherein, A plurality of forming cavities are arranged at both ends of the mold runner, and the plurality of forming cavities are communicated with the mold runner.

5. A hot and cold open hot runner mold according to claim 1 or 2 or 3, characterized in that, The fixed mold base plate is fixed through bolts and the support plate, and a plurality of spacers are arranged between the fixed mold plate and the support plate.

6. A hot and cold open hot runner mold according to claim 5, wherein The spacers are fixed on the upper surface of the runner plate through bolts, and the runner plate is fixed on the support plate through bolts.

7. A hot and cold open hot runner mold according to claim 4, wherein The sprue bushing is used for injecting raw materials into the mold runner, and the forming cavities are arranged below both sides of the sprue bushing.

8. A hot and cold open hot runner mold according to claim 7, characterized in that, A front mold core is arranged above the forming cavities, and the front mold core is arranged on both sides of the sprue bushing.

9. A hot and cold open hot runner mold according to claim 8, characterized in that, The upper half of the front mold core is fixed on a core fixing plate, and the core fixing plate is fixed below the support plate through bolts.

10. The hot and cold open hot runner mold according to claim 8, wherein, A fixed mold plate is arranged below the core fixing plate, and the lower half of the front mold core is fixed on the fixed mold plate.

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