A hot runner manifold and hot runner system comprising the same

Abstract

The application relates to a hot runner manifold and a hot runner system comprising the same, which is internally provided with a non-linear distribution channel and a linear transfer channel communicated with the distribution channel, and comprises a first manifold, a third manifold and a second manifold fixedly connected between the first manifold and the third manifold; a first groove is formed on one side of the first manifold facing the second manifold, a second groove is formed on one side of the second manifold facing the first manifold, the first groove and the second groove correspond to each other and surround the distribution channel, and a third groove is formed on the third manifold, the third groove and the second manifold surround the transfer channel. The hot runner manifold and the hot runner system designed by the application have the characteristics of high flexibility of channel design, strong adaptability of product structure and wide application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of hot runner injection molds, and in particular to a hot runner manifold and a hot runner system including the same. Background Technology

[0002] The 1-pipe, 4-structure needle valve hot runner system is a commonly used hot runner solution in the injection molding of small-sized products. Its core advantages lie in its high density of runner arrangement, aesthetically pleasing gate formation, and ability to achieve gateless injection molding, effectively improving material utilization and processing efficiency. The application of this structure requires two prerequisites: firstly, the product size must be small; and secondly, the gate must be located at the top of the product. Based on these characteristics, the number of mold cavities using this structure can be flexibly increased to 96 to 192 cavities according to production needs. It also boasts advantages such as compact overall mold size and low requirements for injection molding machine tonnage, making it suitable for large-scale injection molding production scenarios.

[0003] To achieve the movement and positioning of the valve needle, the valve needle with a 1-tube-4 structure needs to penetrate the runner plate. Therefore, the runner plate must have clearance holes for the valve needle to pass through. At the same time, the runner plate needs to be designed with a branch runner structure. In order to ensure the uniform distribution of molten plastic during injection molding, the branch runners of the same level must be absolutely consistent in length and cross-sectional diameter. This design principle means that the arrangement of all runner holes is completely determined by the product arrangement of the mold and cannot be adjusted independently.

[0004] In existing technology, the flow channel holes in the runner plate are formed by drilling, and the openings are sealed with bolts. Due to processing limitations, the flow channel must remain straight. Furthermore, the connection point between the flow channel plate and the heating seat's flow channel holes is located at the center of every four valve pin clearance holes. Therefore, the flow channel of the runner plate must pass through the gaps between the valve pin clearance holes to align with the flow channel holes of the heating seat. Under this structure, the positional relationship between the valve pin clearance holes and the flow channel is strictly constrained: they must strictly avoid contact or interference, otherwise the flow channel's sealing performance will be compromised, causing molten plastic to leak from the contact point during injection molding, resulting in leakage and severely impacting product molding quality and production continuity.

[0005] To mitigate the aforementioned risk of glue leakage, a fixed design standard has been established through long-term industry practice: the four valve pins managed by each heating seat and their corresponding clearance holes must be arranged in a right-angled cross shape. Even a slight deviation in this arrangement significantly increases the probability of contact interference between the valve pin clearance holes and the runner, leading to glue leakage. The arrangement of the valve pin clearance holes directly determines the product's placement and the gate's location. This rigid constraint significantly limits the application scenarios of existing 1-pipe, 4-structure needle valve hot runner systems: on the one hand, the product placement design on the mold is limited to a right-angled cross arrangement, making it impossible to flexibly adjust according to product structural characteristics, mold space layout, and other actual needs; on the other hand, the gate position is forcibly limited to the exact center of the top of the product, failing to adapt to the differentiated requirements of product function design and appearance for gate location, greatly restricting the widespread application of this type of hot runner system in multi-specification, complex, and small-sized products.

[0006] In summary, existing 1-tube, 4-structure needle valve hot runner systems suffer from limitations in runner processing methods (drilling) and runner layout, making it difficult to avoid interference risks between the valve needle clearance holes and the runner. This, in turn, imposes rigid constraints on product placement and gate location, resulting in insufficient application flexibility. Therefore, a new hot runner design scheme is urgently needed to solve the interference problem between the valve needle clearance holes and the runner by changing the runner design and processing methods, thereby increasing the degree of freedom in runner design and overcoming existing application limitations. Utility Model Content

[0007] The purpose of this application is to address the shortcomings of the existing technology and provide a hot runner system with high design freedom and good correspondence with the mold product structure.

[0008] In a first aspect, this application provides a hot runner manifold, which has a non-linear distribution channel and a linear transfer channel connected to the distribution channel inside. It includes a first manifold, a third manifold, and a second manifold fixedly connected between the first manifold and the third manifold. The first manifold has a first groove on the side facing the second manifold, and the second manifold has a second groove on the side facing the first manifold. The first groove and the second groove correspond to each other and form the distribution channel. The third manifold has a third groove, and the third groove and the second manifold form the transfer channel.

[0009] More specifically, the distribution channel includes a first distribution channel and a second distribution channel, and the transfer channel connects the first distribution channel and the second distribution channel.

[0010] More specifically, the first distribution channel, the second distribution channel, and the transfer channel are all geometrically symmetrically distributed inside the hot runner manifold.

[0011] More specifically, the hot runner distribution plate has several through-holes, and several through-holes are evenly distributed around the end of the second distribution channel.

[0012] More specifically, the first distribution channel includes a first sub-channel and a second sub-channel that is inclinedly connected to the first sub-channel, and several clearance holes are evenly distributed around the end of the second sub-channel.

[0013] More specifically, it also includes a valve needle passing through the vent hole and a heating seat connected to the valve needle.

[0014] More specifically, the cross-section of the distribution channel is circular.

[0015] More specifically, the structures of the first and second tanks are mirror-symmetrical.

[0016] More specifically, the hot runner manifold plate is provided with several symmetrically distributed weight reduction grooves.

[0017] Secondly, this application provides a hot runner system, including the aforementioned hot runner manifold.

[0018] The beneficial effects of this application are: The manifold designed in this application has a non-linear flow channel. The style of the vent holes and flow channels can be adjusted to conform to the shape of the target product, overcoming the structural limitations of the traditional 1-pipe 4-structure needle valve hot runner system. It can be adapted to multiple types of products, significantly improving flexibility and making the system application scenarios more diverse.

[0019] The multi-layer flow divider designed in this application can be fixed by high-precision welding, avoiding the leakage risk of traditional drilling and bolt sealing. Compared with traditional complex drilling, the tank is easier to achieve high-precision processing. The flow channel has no dead corners, the flow channel wall is smooth, and the processing melt residue is small, which can ensure the integrity of the product boundary. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the flow channel structure in a traditional hot runner manifold.

[0021] Figure 2 This is a three-dimensional schematic diagram of a traditional hot runner manifold.

[0022] Figure 3 This is a schematic diagram of the hot runner structure in this application.

[0023] Figure 4 This is an exploded schematic diagram of the hot runner manifold in this application.

[0024] In the diagram: 1. Heating seat; 2. Hot runner; 3. Bolt; 4. Clear hole; 5. Valve needle; 21. First sub-flow channel; 22. Second sub-flow channel; 23. Transfer channel; 24. Second distribution channel. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] Traditional flow channel systems such as Figure 1 As shown, the hot runner 2 within the runner plate passes through the gaps between the clearance holes 4 and finally connects to the runner hole of the heating base 1. The arrangement of the clearance holes 4 is consistent with the arrangement of the product and the gate. Drilling is a portable runner processing method, and drilling can maintain the straight-through state of the hot runner 2, such as... Figure 2 As shown, the outer orifice is sealed with bolt 5. However, since the connection between the flow channel plate and the flow channel hole of the heating seat is located at the center of every 4 clearance holes 4, the flow channel of the flow channel plate must pass through the gap between the clearance holes 4 to connect to the heating seat 1. The clearance holes 4 must be arranged in a positive cross direction so that the flow channel can smoothly avoid the clearance holes 4. The limited arrangement of clearance holes indirectly restricts the product layout.

[0029] To overcome the shortcomings of existing technologies and break through the structural limitations of traditional 1-tube 4-structure needle valve hot runner systems, such as... Figure 3 and Figure 4 As shown, this application designs a novel hot runner manifold. Unlike traditional cross-shaped flow channels, the internal flow channels of this application include a non-linear distribution flow channel and a linear transfer flow channel 23 connected to the distribution flow channel. Specifically, the manifold includes a first manifold 11, a third manifold 13, and a second manifold 12 fixedly connected between the first manifold 11 and the third manifold 13. The manifolds can be assembled together by friction welding or bolt fixing. To ensure good airtightness of the hot runner, a first groove is formed on the side of the first manifold 11 facing the second manifold 12, and a second groove is formed on the side of the second manifold 12 facing the first manifold 11. The first and second grooves correspond to each other and are mirror-symmetrical in structure, forming a distribution flow channel. The third diversion plate 13 has a third groove, which together with the second diversion plate 12 forms a transfer channel 23. The second diversion plate 12 has a through hole for connecting the distribution channel and the transfer channel 23.

[0030] In some specific embodiments, to accommodate a wider variety of product styles, the distribution channel in this application specifically includes a first distribution channel and a second distribution channel 24, with a transfer channel 23 connecting the first and second distribution channels 24. The paths of each channel in the hot runner manifold should, as far as possible, ensure that the filling and heating times of each channel are the same. To ensure that the thermoplastic material flows evenly from the second distribution channel 24 to the branches of the first distribution channel, the transfer channel 23 is located on the outer third manifold 13. After the thermoplastic material fills to the end of the second distribution channel 24, it vertically rises / falls into the transfer channel 23 of the third manifold 13. After the transfer channel 23 is fully filled, it continues to fall / rise evenly fill the first distribution channel. In a further improvement of this application, the first distribution channel includes a first sub-channel 21 and a second sub-channel 22. To accommodate diverse product types, the first sub-channel 21 and the second sub-channel 22 are connected at a certain angle on the plane, and the angle of inclination can be adaptively adjusted according to the product shape. To ensure that the thermoplastic material is evenly distributed in the flow channel, the first sub-flow channel 21, the second sub-flow channel 22, the second distribution flow channel 24, and the transfer flow channel 23 in the hot runner manifold are all circular flow channels, and the four types of flow channels are all geometrically symmetrically distributed.

[0031] The processing methods for hot runners in this application are more diverse. A runner plate with corresponding grooves can be prepared directly using a mold, or the corresponding grooves can be opened by turning or milling after the runner plate is formed.

[0032] The hot runner manifold has several through-holes 4. Several through-holes 4 are evenly distributed around the end of the second sub-flow channel 22, with the end of the second sub-flow channel 22 located at the geometric center of the through-holes 4. The number of through-holes is 4, but can also be 3, 5, 6, or more. The through-holes 4 pass through a valve needle and a heating seat connected to the valve needle. In some specific embodiments, to reduce the overall weight and manufacturing cost of the manifold, such as... Figure 4 As shown, the hot runner manifold also has several symmetrically distributed weight reduction grooves.

[0033] The embodiments of this utility model have been described in detail above, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A hot runner manifold, comprising a non-linear distribution channel and a linear transfer channel communicating with the distribution channel, characterized in that, It includes a first diverter plate, a third diverter plate, and a second diverter plate fixedly connected between the first diverter plate and the third diverter plate; the first diverter plate has a first groove on the side facing the second diverter plate, and the second diverter plate has a second groove on the side facing the first diverter plate. The first groove and the second groove correspond to each other and form the distribution channel. The third diverter plate has a third groove, and the third groove and the second diverter plate form a transfer channel.

2. The hot runner manifold according to claim 1, characterized in that, The distribution channel includes a first distribution channel and a second distribution channel, and the transfer channel connects the first distribution channel and the second distribution channel.

3. The hot runner manifold according to claim 2, characterized in that, The first distribution channel, the second distribution channel, and the transfer channel are all geometrically symmetrically distributed inside the hot runner manifold.

4. The hot runner manifold according to claim 2, characterized in that, The hot runner distribution plate has several through-holes, and several holes are evenly distributed around the end of the second distribution channel.

5. The hot runner manifold according to claim 4, characterized in that, The first distribution channel includes a first sub-channel and a second sub-channel that is inclinedly connected to the first sub-channel. Several clearance holes are evenly distributed around the end of the second sub-channel.

6. The hot runner manifold according to claim 4, characterized in that, It also includes a valve needle passing through the vent hole and a heating seat connected to the valve needle.

7. The hot runner manifold according to claim 1, characterized in that, The cross-section of the distribution channel is circular.

8. The hot runner manifold according to claim 1, characterized in that, The first and second tanks are mirror images of each other.

9. The hot runner manifold according to claim 1, characterized in that, The hot runner manifold has several symmetrically distributed weight reduction grooves.

10. A hot runner system, characterized in that, Includes the hot runner manifold as described in any one of claims 1 to 9.

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