A hot nozzle sealing structure and hot runner system

Abstract

The utility model belongs to hot runner system technical field discloses a kind of hot nozzle sealing structure and hot runner system. Hot nozzle sealing structure includes limiting piece, elastic expansion piece and connecting assembly. Limiting piece is set on the template of mould, and limiting piece is configured to limit hot nozzle. Elastic expansion piece is set on hot nozzle, and located between shunt plate and template. Connecting assembly is configured to connect hot nozzle and template, and compress elastic expansion piece, to push hot nozzle to abut shunt plate by elastic expansion piece. The utility model because elastic expansion piece has elastic deformation capacity, when tiny gap is generated between hot nozzle and shunt plate cooperation, elastic expansion piece can be through the expansion of itself self-adapting tiny gap, continuously maintain the force of pushing hot nozzle to abut shunt plate, to reduce the possibility of melt leakage, to reduce the defect of the lack of material, shrink mark, dimensional deviation etc. caused by melt pressure deficiency, flow fluctuation of forming product, improve product quality.

Description

Technical Field

[0001] This utility model relates to the field of hot runner system technology, and in particular to a hot nozzle sealing structure and a hot runner system. Background Technology

[0002] Hot nozzles and manifolds are key components of melt delivery systems, widely used in plastic parts molding and other applications. Their core function is to stably deliver high-temperature melt (such as molten plastic or resin) to the mold cavity under high pressure, ensuring continuous production and product molding quality.

[0003] In existing technologies, hot nozzles and manifolds are typically connected by a rigid fit structure. The mating surfaces of the two are designed as flat or stepped surfaces, and a pre-tightening force is applied by fasteners such as bolts to achieve a tight fit. During operation, the high-temperature molten material is transported to the hot nozzle through the internal channels of the manifold under pressure, and then injected into the mold through the outlet of the hot nozzle. The mating surfaces must withstand the high temperature and high pressure brought by the molten material.

[0004] However, under the aforementioned high temperature and high pressure conditions, the hot nozzle and the manifold have different thermal expansion due to material differences, resulting in different thermal deformation of the mating surfaces. Pressure fluctuations during melt delivery cause periodic impacts on the mating surfaces. In addition, uneven preload or gaps may exist during initial assembly. Under the influence of these factors, tiny gaps can easily form between the mating surfaces, leading to leakage of the high temperature and high pressure melt. This, in turn, results in insufficient melt pressure and flow fluctuations entering the mold, causing defects such as material shortages, shrinkage marks, and dimensional deviations in the molded products, thus affecting product quality.

[0005] Therefore, the above problems urgently need to be solved. Utility Model Content

[0006] The purpose of this invention is to provide a hot nozzle sealing structure and a hot runner system to reduce defects such as material shortage, shrinkage marks, and dimensional deviations in molded products caused by insufficient melt pressure and flow fluctuations, thereby improving product quality.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A hot nozzle sealing structure is used to position a hot nozzle between a manifold and a mold, so that the melt in the manifold can be transported to the cavity of the mold through the hot nozzle. The hot nozzle sealing structure includes a limiting member, an elastic telescopic member, and a connecting assembly, wherein:

[0009] A limiting member is disposed on the template of the mold, and the limiting member is configured to limit the hot nozzle;

[0010] An elastic telescopic component is disposed on the hot nozzle and located between the flow divider and the template;

[0011] A connecting assembly is configured to connect the hot nozzle and the template, and to compress the elastic telescopic member to push the hot nozzle against the diverter plate via the elastic telescopic member.

[0012] Preferably, the limiting member is sleeved on the hot nozzle, and the limiting member slides in conjunction with the hot nozzle;

[0013] The template has mounting holes, and the limiting member is at least partially embedded in the mounting holes.

[0014] Preferably, the end of the limiting member facing the diverter plate is provided with a limiting flange for abutting against the elastic telescopic member.

[0015] Preferably, the limiting member has a limiting groove on the side away from the diverter plate, and the hot nozzle is provided with a mating block, which slides and engages with the limiting groove and abuts against the bottom of the limiting groove.

[0016] Preferably, the elastic telescopic element is a spring washer.

[0017] Preferably, the spring washer has a central hole, and the spring washer is sleeved on the end of the hot nozzle facing the distributor plate through the central hole.

[0018] Preferably, the hot nozzle sealing structure further includes an anti-rotation component disposed between the hot nozzle and the template, the anti-rotation component being configured to restrict the hot nozzle from rotating about its own axis.

[0019] Preferably, the anti-rotation component includes:

[0020] The snap-fit ​​component includes a snap-fit ​​groove adapted to the outer periphery of the hot nozzle, and the snap-fit ​​component is sleeved on the outer periphery of the hot nozzle through the snap-fit ​​groove;

[0021] A positioning pin passes through the snap-fit ​​and is inserted into the template to restrict the snap-fit ​​and the hot nozzle from rotating about their own axis.

[0022] Preferably, the connecting assembly includes a plurality of bolts, which are spaced apart circumferentially along the hot nozzle, and each bolt passes through the manifold and is screwed to the template, thereby locking the manifold and the template and compressing the elastic telescopic member.

[0023] A hot runner system includes a manifold, hot nozzles, a template, and a hot nozzle sealing structure as described above, wherein:

[0024] The hot nozzle is disposed between the manifold and the mold through the hot nozzle sealing structure, so that the melt in the manifold can be transported to the cavity of the mold through the hot nozzle.

[0025] The beneficial effects of this utility model are:

[0026] Because the elastic expansion component of this invention has the ability to deform elastically, when a tiny gap is generated between the hot nozzle and the manifold, the elastic expansion component can adapt to the tiny gap through its own expansion and contraction, and continuously maintain the force that pushes the hot nozzle against the manifold, thereby reducing the possibility of melt leakage. This reduces defects such as material shortage, shrinkage marks, and dimensional deviations in the molded products caused by insufficient melt pressure and flow fluctuations, thus improving product quality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the hot nozzle sealing structure provided by this utility model;

[0028] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0029] Figure 3 This is a structural schematic diagram of the limiting component provided by this utility model;

[0030] Figure 4 This is a structural schematic diagram of the elastic telescopic component provided by this utility model;

[0031] Figure 5 This is a schematic diagram of the snap-fit ​​component provided by this utility model.

[0032] In the picture:

[0033] 100. Hot nozzle; 101. Mating block; 200. Manifold; 300. Mold; 301. Mounting hole;

[0034] 1. Limiting component; 11. Limiting flange; 12. Limiting groove;

[0035] 2. Elastic expansion joint; 21. Central hole;

[0036] 3. Connecting components; 31. Bolts;

[0037] 4. Anti-rotation component; 41. Snap-fit ​​connector; 42. Positioning pin; 411. Snap-fit ​​slot. Detailed Implementation

[0038] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0039] In this application, the terms "comprising," "including," "having," 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 limitation, 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 that element.

[0040] In this application, the term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump can represent: the existence of only one centrifugal vortex magnetic pump, the simultaneous existence of one centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump, or the existence of only one centrifugal vortex magnetic pump. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0041] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0042] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0043] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0044] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0045] Please see Figures 1 to 5 This embodiment provides a hot nozzle sealing structure for positioning a hot nozzle 100 between a manifold 200 and a mold 300, so that the melt within the manifold 200 can be conveyed to the cavity of the mold 300 via the hot nozzle 100. The hot nozzle sealing structure includes a limiting member 1, an elastic telescopic member 2, and a connecting assembly 3. The limiting member 1 is disposed on the template of the mold 300 and is configured to limit the hot nozzle 100. The elastic telescopic member 2 is disposed on the hot nozzle 100 and located between the manifold 200 and the template. The connecting assembly 3 is configured to connect the hot nozzle 100 and the template and compress the elastic telescopic member 2 to push the hot nozzle 100 against the manifold 200.

[0046] Understandably, because the elastic expansion member 2 has the ability to deform elastically, when a small gap is generated between the hot nozzle 100 and the flow divider 200, the elastic expansion member 2 can adapt to the small gap through its own expansion and contraction, and continuously maintain the force that pushes the hot nozzle 100 against the flow divider 200, thereby reducing the possibility of melt leakage, and thus reducing defects such as material shortage, shrinkage marks, and dimensional deviations in the molded products caused by insufficient melt pressure and flow fluctuations, thereby improving product quality.

[0047] When the hot nozzle 100 and the manifold 200 undergo different thermal expansions due to their different materials, the elastic expansion member 2 can adapt to this deformation difference through its own expansion and contraction, continuously maintaining the force that pushes the hot nozzle 100 against the manifold 200, reducing the possibility of gaps appearing on the mating surface due to thermal deformation differences.

[0048] In addition, the elastic properties of the elastic expansion member 2 can buffer the periodic impact of pressure fluctuations on the mating surface during the melt conveying process, avoiding the impact from directly causing the mating surface of the hot nozzle 100 and the diverter plate 200 to separate, thereby reducing the risk of gaps caused by impact.

[0049] In addition, the thrust generated by the connecting component 3 compressing the elastic telescopic component 2 is continuous and can be adjusted by elastic deformation, which can make up for the fitting gap during initial assembly, and the distribution of elastic force is relatively more uniform, reducing the occurrence of gaps on the mating surface due to uneven preload or gaps.

[0050] In this embodiment, the limiting member 1 is sleeved on the hot nozzle 100, and the limiting member 1 and the hot nozzle 100 are slidably engaged. A mounting hole 301 is provided on the template, and the limiting member 1 is at least partially embedded in the mounting hole 301. This arrangement, with the limiting member 1 at least partially embedded in the mounting hole 301 of the template, enables a stable connection between the limiting member 1 and the template, preventing the limiting member 1 from shifting position due to external forces. This ensures that the limiting member 1 provides a stable and reliable limiting effect on the hot nozzle 100, providing a basic guarantee for maintaining the relative position of the hot nozzle 100 with the mating surface of the distributor plate 200, and reducing the possibility of the hot nozzle 100 deviating from its preset position due to limiting failure, thus exacerbating the gap at the mating surface.

[0051] More importantly, the limiting member 1 is sleeved on the hot nozzle 100 and the two are slidably engaged. On the one hand, the limiting member 1 can form a radial constraint on the hot nozzle 100, limiting the hot nozzle 100 from shifting in unnecessary directions and ensuring the alignment accuracy of the mating surface between the hot nozzle 100 and the flow divider 200. On the other hand, the sliding engagement allows the hot nozzle 100 to move axially relative to the limiting member 1, so that when the hot nozzle 100 and the flow divider 200 deform due to thermal expansion differences, or when the elastic telescopic member 2 pushes the hot nozzle 100 to adjust its position, the hot nozzle 100 can move smoothly under the constraint of the limiting member 1. This avoids the hot nozzle 100 being unable to adapt to deformation or the elastic thrust being unable to be effectively transmitted due to excessively tight limiting, thereby ensuring that the elastic telescopic member 2 can continuously push the hot nozzle 100 against the flow divider 200 and further reduce the generation of gaps on the mating surface.

[0052] Furthermore, the end of the limiting member 1 facing the diverter plate 200 is provided with a limiting flange 11 for abutting against the elastic telescopic member 2, thereby providing a stable axial abutment point for the elastic telescopic member 2. When the connecting assembly 3 compresses the elastic telescopic member 2, one end of the elastic telescopic member 2 can stably abut against the limiting flange 11, while the other end acts on the hot nozzle 100, making the compression direction and force state of the elastic telescopic member 2 more stable, avoiding lateral displacement of the elastic telescopic member 2 during compression or extension, ensuring that the elastic force can be effectively transmitted to the hot nozzle 100 along the axial direction, and ensuring that the direction of the force pushing the hot nozzle 100 against the diverter plate 200 is accurate.

[0053] To improve connection reliability, a limiting groove 12 is formed on the side of the limiting member 1 facing away from the diverter plate 200. A mating block 101 is provided on the hot nozzle 100. The mating block 101 slides and engages with the limiting groove 12 and abuts against the bottom of the limiting groove 12. This arrangement provides the hot nozzle 100 with adjustable space in a specific direction through sliding engagement. At the same time, the mating block 101 abuts against the bottom of the groove to form an axial limit on the hot nozzle 100, preventing the hot nozzle 100 from moving too far away from the diverter plate 200.

[0054] In this embodiment, the elastic telescopic component 2 is a spring washer. As the elastic telescopic component 2, the spring washer possesses stable elastic deformation capability. When the connecting assembly 3 compresses the spring washer, it generates a continuous and controllable elastic thrust, which can stably act on the hot nozzle 100, pushing the hot nozzle 100 against the diverter plate 200. In other embodiments, the elastic telescopic component 2 can also be any elastic component such as a compression spring, a disc spring, or a rubber elastic pad; this embodiment does not impose any limitations or requirements on this.

[0055] Specifically, the spring washer is provided with a central hole 21, and the spring washer is sleeved on the end of the hot nozzle 100 facing the diverter plate 200 through the central hole 21. The spring washer is sleeved on the end of the hot nozzle 100 through the central hole 21, and the fit between the central hole 21 and the outer peripheral surface of the hot nozzle 100 can form a radial constraint on the spring washer, preventing it from radially shifting or tilting when deformed under pressure or when thermally expanding and contracting. This ensures that the elastic force of the spring washer always acts on the hot nozzle 100 along the axial direction of the hot nozzle 100, avoiding uneven force on the hot nozzle 100 due to force deviation, and thus preventing local gaps between the hot nozzle 100 and the diverter plate 200, ensuring the stability of the fit.

[0056] In addition, the space at the connection between the hot nozzle 100 and the manifold 200 is usually compact. The central hole 21 sleeve structure allows the spring washer to be arranged along the axial direction of the hot nozzle 100 without additional radial space, avoiding interference with surrounding components and making it more suitable for narrow installation environments. At the same time, it allows the spring washer to be closer to the mating surface between the hot nozzle 100 and the manifold 200, shortening the transmission path of elastic force and improving the efficiency of force application.

[0057] To further enhance connection reliability, the hot nozzle sealing structure also includes an anti-rotation component 4 disposed between the hot nozzle 100 and the template. The anti-rotation component 4 is configured to restrict the hot nozzle 100 from rotating around its own axis. Generally, the mating surfaces of the hot nozzle 100 and the flow divider 200 are precision-machined flat or conical surfaces. If the hot nozzle 100 rotates around its own axis, local gaps may occur on the mating surfaces due to relative friction or misalignment. Especially when the mating surfaces have minute machining marks or positioning references, rotation can disrupt the initial alignment accuracy, causing irregular gaps on the contact surfaces and increasing the risk of melt leakage. The anti-rotation component 4, by restricting rotation, ensures that the mating surfaces always maintain precise alignment, maintain a uniform contact state, and strengthen the sealing foundation.

[0058] Specifically, the anti-rotation component 4 includes a snap-fit ​​element 41 and a positioning pin 42. The snap-fit ​​element 41 includes a snap-fit ​​groove 411 adapted to the outer periphery of the hot nozzle 100, and the snap-fit ​​element 41 is fitted onto the outer periphery of the hot nozzle 100 through the snap-fit ​​groove 411. The positioning pin 42 passes through the snap-fit ​​element 41 and is inserted into the template to restrict the snap-fit ​​element 41 and the hot nozzle 100 from rotating around their own axis. The snap-fit ​​element 41, fitted onto the outer periphery of the hot nozzle 100 through the adapted snap-fit ​​groove 411, can form a circumferential clamping constraint on the hot nozzle 100. Combined with the positioning pin 42, the snap-fit ​​element 41 is rigidly fixed to the template, directly blocking the possibility of the hot nozzle 100 rotating around its own axis, and the anti-rotation effect is clear and reliable.

[0059] To improve ease of operation, the connecting assembly 3 includes multiple bolts 31, which are spaced apart circumferentially along the hot nozzle 100. Each bolt 31 passes through the flow divider 200 and is screwed onto the template, locking the flow divider 200 and the template and compressing the elastic expansion member 2. The multiple bolts 31, spaced apart circumferentially along the hot nozzle 100, apply a uniform annular clamping force to the flow divider 200 and the template during tightening, preventing warping of components or misalignment of the sealing surface due to excessive localized force. This ensures a tight fit between the hot nozzle 100 and the flow divider 200, fundamentally reducing the risk of melt leakage.

[0060] This embodiment also provides a hot runner system, which includes a manifold 200, a hot nozzle 100, a mold plate, and the aforementioned hot nozzle sealing structure. The hot nozzle 100 is disposed between the manifold 200 and the mold 300 through the hot nozzle sealing structure, so that the melt in the manifold 200 can be transported to the cavity of the mold 300 through the hot nozzle 100. It is understood that the hot runner system including the aforementioned hot nozzle sealing structure can reduce the possibility of melt leakage, thereby reducing defects such as material shortage, shrinkage marks, and dimensional deviations in the molded product caused by insufficient melt pressure and flow fluctuations, and improving product quality.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A hot nozzle sealing structure for disposing a hot nozzle (100) between a manifold (200) and a mold (300) so that melt within the manifold (200) can be conveyed through the hot nozzle (100) to the cavity of the mold (300), characterized in that, The hot nozzle sealing structure includes a limiting member (1), an elastic telescopic member (2), and a connecting assembly (3), wherein: A limiting member (1) is disposed on the template of the mold (300), and the limiting member (1) is configured to limit the hot nozzle (100); An elastic telescopic component (2) is disposed on the hot nozzle (100) and located between the flow divider (200) and the template; The connecting component (3) is configured to connect the hot nozzle (100) and the template, and to compress the elastic telescopic member (2) to push the hot nozzle (100) against the diverter plate (200) through the elastic telescopic member (2).

2. The hot nozzle sealing structure according to claim 1, characterized in that, The limiting member (1) is sleeved on the hot nozzle (100), and the limiting member (1) slides with the hot nozzle (100); The template has an installation hole (301), and the limiting member (1) is at least partially embedded in the installation hole (301).

3. The hot nozzle sealing structure according to claim 2, characterized in that, The limiting member (1) is provided with a limiting flange (11) for abutting against the elastic telescopic member (2) at one end facing the diverter plate (200).

4. The hot nozzle sealing structure according to claim 2, characterized in that, The limiting member (1) has a limiting groove (12) on the side away from the diverter plate (200), and a mating block (101) is provided on the hot nozzle (100). The mating block (101) slides and engages with the limiting groove (12) and abuts against the bottom of the limiting groove (12).

5. The hot nozzle sealing structure according to claim 1, characterized in that, The elastic telescopic component (2) is a spring washer.

6. The hot nozzle sealing structure according to claim 5, characterized in that, The spring washer is provided with a central hole (21), and the spring washer is sleeved on the end of the hot nozzle (100) facing the diverter plate (200) through the central hole (21).

7. The hot nozzle sealing structure according to claim 1, characterized in that, The hot nozzle sealing structure further includes an anti-rotation component (4) disposed between the hot nozzle (100) and the template, the anti-rotation component (4) being configured to restrict the hot nozzle (100) from rotating about its own axis.

8. A hot nozzle sealing structure according to claim 7, characterized in that, The anti-rotation component (4) includes: The snap-fit ​​component (41) includes a snap-fit ​​groove (411) adapted to the outer periphery of the hot nozzle (100), and the snap-fit ​​component (41) is sleeved on the outer periphery of the hot nozzle (100) through the snap-fit ​​groove (411); A positioning pin (42) passes through the snap-fit ​​member (41) and is inserted into the template to restrict the snap-fit ​​member (41) and the hot nozzle (100) from rotating about their own axis.

9. A hot nozzle sealing structure according to claim 1, characterized in that, The connecting assembly (3) includes a plurality of bolts (31) which are spaced apart circumferentially along the hot nozzle (100), and each bolt (31) passes through the diverter plate (200) and is screwed to the template to lock the diverter plate (200) and the template and compress the elastic telescopic member (2).

10. A hot runner system, characterized in that, The hot runner system includes a manifold (200), a hot nozzle (100), a template, and a hot nozzle sealing structure as described in any one of claims 1-9, wherein: The hot nozzle (100) is disposed between the manifold (200) and the mold (300) through the hot nozzle sealing structure, so that the melt in the manifold (200) can be transported to the cavity of the mold (300) through the hot nozzle (100).

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