Hot runner system

Abstract

The present invention discloses a hot runner system, which includes a template, a manifold plate, and a guide sleeve. A plurality of nozzles are provided on one side of the manifold plate facing the template. The nozzle includes a nozzle body and a nozzle tip provided at the end of the nozzle body. The template includes a receiving cavity and a mounting hole that penetrate through in sequence. The guide sleeve is fixed to the template and faces the manifold plate. The manifold plate includes a docking surface, the template includes a dividing surface, and the guide sleeve includes a guiding surface facing the manifold plate. The height difference between the dividing surface and the guiding surface is greater than the height difference between the end of the nozzle tip and the docking surface. This hot runner system achieves more accurate positioning of the manifold plate and the target. During the assembly process of the manifold plate and the template, the contact positioning between the guide sleeve and the manifold plate precedes the contact between the nozzle tip of the nozzle and the mounting hole, so that after the manifold plate is positioned first, the nozzle tip can be assembled into the mounting hole in an accurate direction, and the nozzle tip will not abut against the hole wall and be damaged, achieving a protective effect.

Description

Technical Field

[0001] The present invention relates to the technical field of hot runner injection molding, and particularly relates to a hot runner system. Background Art

[0002] During the process of installing the manifold plate onto the mold plate, it is possible that the nozzle fixed on the manifold plate touches other positions on the mold plate before being installed in place, and then the tip of the nozzle is damaged, affecting the casting. In addition, the temperature of the manifold plate is generally very high, and the temperature of the mold plate is relatively very low compared to the temperature of the manifold plate. During the process of the mold plate supporting the manifold plate, there is inevitably heat transfer from the manifold plate to the mold plate, reducing the temperature of the manifold plate and causing the molten material in the manifold plate to not reach the preset temperature value. The above two problems ultimately affect the quality of the cast product and the production. Summary of the Invention

[0003] To solve the problems in the prior art, the purpose of the present invention is to provide a hot runner system that protects the tip of the nozzle during the installation of the manifold plate and has less heat loss.

[0004] To achieve the above invention purpose, an embodiment of the present invention provides a hot runner system, including a mold plate and a manifold plate. A plurality of nozzles are provided on one side of the manifold plate facing the mold plate. The nozzle includes a nozzle body and a tip provided at the end of the nozzle body. The mold plate includes a receiving cavity and a mounting hole that penetrate through in sequence. The aperture of the receiving cavity is larger than the aperture of the mounting hole. The nozzle passes through the receiving cavity until the tip passes through the mounting hole. The hot runner system further includes a guide sleeve. The guide sleeve is fixed to the mold plate and faces the manifold plate. The manifold plate is provided with a guide hole for accommodating the guide sleeve. The manifold plate includes a docking surface adjacent to the guide hole and facing the mold plate. The mold plate includes an interface surface between the receiving cavity and the mounting hole. The guide sleeve includes a guiding surface facing the manifold plate. The height difference between the interface surface and the guiding surface is greater than the height difference between the end of the tip and the docking surface.

[0005] As a further improvement of the present invention, the guide sleeve includes a guiding portion and a supporting portion. The cross-section of the guide hole covers the cross-section of the guiding portion, and the cross-section of the supporting portion covers the cross-section of the guide hole.

[0006] As a further improvement of the present invention, the hot runner system further includes a locking screw. The guide sleeve includes a through hole, and the mold plate includes a threaded hole opposite to the through hole. The locking screw passes through the manifold plate, the guide sleeve, and the threaded hole in sequence.

[0007] As a further improvement of the present invention, a heat insulation gasket is provided between the locking screw and the manifold plate.

[0008] As a further improvement of the present invention, the guiding hole is arranged as a U-shaped hole, and the notch position of the U shape faces the outside.

[0009] As a further improvement of the present invention, the flow dividing plate includes a plurality of U-shaped holes. The connecting line direction between the notch and the U-shaped bottom of each U-shaped hole faces the center of the flow dividing plate, and every two U-shaped holes are symmetrically arranged on both sides of the center position.

[0010] As a further improvement of the present invention, the height L of the supporting part is equal to the distance difference between the distance L1 between the lowest point of the nozzle tip and the docking surface and the distance L2 between the lowest point of the nozzle tip and the template surface when it is installed in place.

[0011] As a further improvement of the present invention, a positioning member is arranged on the side of the flow dividing plate facing the template, and a positioning groove for accommodating the positioning member is arranged on the template surface.

[0012] As a further improvement of the present invention, a plurality of protrusions are arranged on the surface of the positioning member and / or the positioning groove, and the flow dividing plate and the template are in contact only through the plurality of protrusions at the positioning member.

[0013] As a further improvement of the present invention, the positioning member includes a positioning cylinder, and the axis of the positioning cylinder is arranged at the center position of the flow dividing plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By arranging the guiding sleeve, the present invention realizes more accurate positioning of the flow dividing plate and the target. By controlling the height of the guiding surface of the guiding sleeve, during the assembly process of the flow dividing plate and the template, the contact positioning between the guiding sleeve and the flow dividing plate precedes the contact between the nozzle tip of the hot nozzle and the installation hole. Thus, after the flow dividing plate is positioned first, the nozzle tip is then assembled into the installation hole in an accurate direction, and the nozzle tip will not abut against the hole wall and be damaged, achieving a protective effect. Moreover, the flow dividing plate and the template are separated by the guiding sleeve, reducing the heat transfer from the flow dividing plate to the template and reducing heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural view of the flow dividing plate according to an embodiment of the present invention;

[0016] Figure 2 is a top view of the hot runner system according to an embodiment of the present invention;

[0017] Figure 3 is Figure 2 a cross-sectional view of the template in the A-A direction in;

[0018] Figure 4 is Figure 2 a cross-sectional view of a certain position during the assembly of the flow dividing plate and the template in the A-A direction in;

[0019] Figure 5 is Figure 2 A sectional view of the shunt plate and the template assembled in the A-A direction in the middle;

[0020] Among them, 1 is the shunt plate; 10 is the docking surface; 11 is the U-shaped hole; 110 is the notch; 12 is the positioning member; 121 is the positioning cylinder; 122 is the protrusion; 2 is the template; 20 is the interface; 21 is the receiving cavity; 22 is the mounting hole; 23 is the positioning groove; 24 is the threaded hole; 3 is the guide sleeve; 30 is the guide surface; 31 is the guiding portion; 32 is the supporting portion; 33 is the through hole; 4 is the hot nozzle; 41 is the nozzle tip; 5 is the locking screw; 51 is the heat insulation gasket. Specific embodiments

[0021] The present invention will be described in detail below in conjunction with the specific embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included in the protection scope of the present invention.

[0022] It should be understood that the terms indicating relative spatial positions such as "upper", "above", "lower", "below", etc. used herein are for the purpose of facilitating description of the relationship between one unit or feature and another unit or feature as shown in the drawings. The terms of relative spatial positions may be intended to include different orientations of the device in use or operation other than the orientation shown in the figures.

[0023] An embodiment of the present invention provides a hot runner system, which realizes accurate positioning during the process of installing the shunt plate onto the template and avoids the problem of the nozzle tip being damaged.

[0024] Specifically, a hot runner system of this embodiment includes a template 2 and a shunt plate 1. The shunt plate 1 is as shown in Figure 1 and Figure 2 shown, the template 2 is as shown in Figure 3 shown. A plurality of hot nozzles 4 are arranged on the side of the shunt plate 1 facing the template 2. The hot nozzle 4 includes a hot nozzle 4 body and a nozzle tip 41 arranged at the end of the hot nozzle 4 body. A hot runner is arranged inside the shunt plate 1, and molten injection plastic flows inside the hot runner. A runner is arranged along the extension direction of the hot nozzle 4 and extends all the way to the nozzle tip 41. The hot runner inside the shunt plate 1 is connected to the runner to convey the molten injection plastic to the positions of each nozzle tip 41. The template 2 includes a receiving cavity 21 and a mounting hole 22 that penetrate through in sequence. The aperture of the receiving cavity 21 is larger than the aperture of the mounting hole 22. The receiving cavity 21 is used to accommodate the hot nozzle 4 body. The hot nozzle 4 passes through the receiving cavity 21 until the nozzle tip 41 passes through the mounting hole 22. A cavity is formed inside the template 2, and the cavity is used to fill the liquid conveyed by the nozzle tip 41. The shunt plate 1 is fixedly installed on the template 2 to form a complete hot runner system.

[0025] To clearly express the positions and directions described in this embodiment, in this embodiment, the direction of the flow splitter 1 relative to the template 2 is defined as upward, and the opposite direction is defined as downward. As Figures 3 to 5 shown, the molten injection molding material is injected into the template 2 from top to bottom.

[0026] The hot runner system further includes a guide bushing 3. The guide bushing 3 is fixed to the template 2 and faces the flow splitter 1. The flow splitter 1 is provided with a guide hole for accommodating the guide bushing 3. During the process of assembling the flow splitter 1 onto the template 2 from top to bottom, it will contact the guide bushing 3, and the guide bushing 3 is inserted into the guide hole. The flow splitter 1 includes a docking surface 10 adjacent to the guide hole and facing the template 2. The template 2 includes an interface surface 20 between the accommodation cavity 21 and the mounting hole 22. The guide bushing 3 includes a guide surface 30 facing the flow splitter 1. The height difference between the interface surface 20 and the guide surface 30 is greater than the height difference between the end of the nozzle tip 41 and the docking surface 10. In this way, when the flow splitter 1 moves downward, the hot nozzle 4 will be inserted into the accommodation cavity 21. Before the hot nozzle 4 reaches the interface surface 20 between the accommodation cavity 21 and the mounting hole 22, the docking surface 10 will first contact the guide surface 30 of the guide bushing 3. When the flow splitter 1 continues to move downward, since the guide bushing 3 has been inserted into the guide hole at this time, when the hot nozzle 4 reaches the position of the mounting hole 22 and below, it is always guided and will not shift, and the nozzle tip 41 will not be damaged.

[0027] The size of the nozzle tip 41 at the end of the hot nozzle 4 is generally smaller than that of the hot nozzle 4 body. At the position where the template 2 accommodates the hot nozzle 4 body, the aperture of the accommodation cavity 21 is generally made larger relative to the hot nozzle 4 body. Therefore, the size of the accommodation cavity 21 is even larger than that of the nozzle tip 41. So during the assembly process, the hot nozzle 4 is first inserted into the accommodation cavity 21 and then contacts the guide bushing 3. During this process, the probability of the nozzle tip 41 touching the wall is also small. And the size of the mounting hole 22 is small, and positioning can be carried out before reaching this position. Such a setting can make the height of the guide bushing 3 not need to be very high, that is, it is not necessary to position before the hot nozzle 4 enters the accommodation cavity 21, and its purpose is also achieved, and it also avoids the problem that the size of the guide bushing 3 is too high and occupies too much space.

[0028] In addition, when disassembly is required, it can be clearly seen that before the nozzle tip 41 moves upward to the interface surface 20, that is, the nozzle tip 41 in the mounting hole 22 will not contact the side wall. It is not until it moves into the accommodation cavity 21 that the flow splitter 1 will disengage from the guide bushing 3, avoiding the problem of the nozzle tip 41 being scratched by the mounting hole 22, thus providing protection for the nozzle tip 41 during both assembly and disassembly.

[0029] The template 2 can be provided with a mounting hole 22. The side of the guide bushing 3 facing the template 2 is provided with a mounting portion. After the mounting portion is inserted into the mounting hole 22, together with the locking screw 5 which will be described below, only a plug-in fit relationship is required between the guide bushing 3 and the mounting portion.

[0030] Further, the guide sleeve 3 includes a guiding portion 31 and a supporting portion 32. The cross-section of the guiding hole covers the cross-section of the guiding portion 31, and the cross-section of the supporting portion 32 covers the cross-section of the guiding hole. When the manifold plate 1 reaches the position of the guiding portion 31, since the cross-section of the guiding hole covers the cross-section of the guiding portion 31, the guiding portion 31 will be inserted into the guiding hole. The supporting portion 32 is arranged below the guiding portion 31, that is, on the side close to the template 2. The manifold plate 1 contacts the guiding portion 31 first and then the supporting portion 32. Since the cross-section of the supporting portion 32 covers the cross-section of the guiding hole, it stops moving when it reaches the position of the supporting portion 32, and the supporting portion 32 plays a supporting role. The guide sleeve 3 realizes both the guiding and supporting functions at the same time.

[0031] In the prior art, in some solutions, a certain number of washers are stacked according to the distance between the manifold plate 1 and the template 2. The use of a large number of washers is inconvenient to operate, and this method consumes too many washers, and the supporting position is not accurate and reliable. This embodiment avoids the effect of stacking a large number of washers to achieve the height, and also reduces the problem of heat transfer caused by a large number of washers.

[0032] In addition, the hot runner system further includes a locking screw 5. As Figure 5 shown, the guide sleeve 3 includes a through hole 33, and the template 2 includes a threaded hole 24 arranged opposite to the through hole 33. The locking screw 5 passes through the manifold plate 1, the guide sleeve 3 and the threaded hole 24 in sequence, so as to fix the manifold plate 1 on the guide sleeve 3, thereby determining the positional relationship between the manifold plate 1 and the template 2.

[0033] Moreover, a heat insulation gasket 51 is arranged between the locking screw 5 and the manifold plate 1. This gasket isolates the heat of the manifold plate 1 from being transferred to the lower template 2 through the locking screw 5, reducing heat loss.

[0034] Further, the guiding hole is set as a U-shaped hole 11, and the U-shaped notch 110 thereof faces the outside. As Figure 1 shown, the heat on the manifold plate 1 is high, and thermal expansion inevitably exists. Therefore, the structure of the U-shaped hole 11 is set to facilitate heat dissipation from the side of the hole and leave more space for deformation.

[0035] Furthermore, the flow splitter 1 includes a plurality of U-shaped holes 11. The direction of the line connecting the notch 110 and the U-shaped bottom of each U-shaped hole 11 faces the center of the flow splitter 1, and every two U-shaped holes 11 are symmetrically arranged on both sides of the center position. In the figure of this embodiment, 4 U-shaped holes 11 are provided. The U-shaped hole 11 includes a notch 110 and a bottom corresponding to the notch 110. The cross-section of the bottom position is approximately semi-circular. Each U-shaped hole 11 faces the center and is symmetrically arranged. In this way, the thermal expansion of each U-shaped hole 11 in each direction is similar, and the U-shaped holes 11 in each direction expand or contract uniformly. The deformation amount of the entire hot runner system is stable and controllable, avoiding the failure form of local distortion and deformation.

[0036] In addition, a positioning member 12 is provided on one side of the flow splitter 1 facing the template 2, and a positioning groove 23 for accommodating the positioning member 12 is provided on the surface of the template 2. The area of the guide sleeve 3 is relatively small compared to the positioning member 12. The positioning member 12 is used for positioning with a larger area, making the positions of the flow splitter 1 and the template 2 accurate and reliable. The positioning member 12 includes a positioning cylinder 121, and the axis of the positioning cylinder 121 is arranged at the center position of the flow splitter 1. Arranging at the center position can expand thermally uniformly in all directions, and can be used for accurately positioning the U-shaped holes 11 facing the center position, facilitating positioning and accurate positioning, which is beneficial to production and manufacturing. As Figure 2 shown, the orientations of two U-shaped holes 11 on the diagonal both point to the center position of the flow splitter 1 and are symmetric.

[0037] A number of protrusions 122 are provided on the surface of the positioning member 12 and / or the positioning groove 23. The flow splitter 1 and the template 2 only contact at the positioning member 12 through a number of protrusions 122. In this way, the contact area between the flow splitter 1 and the template 2 is reduced, and the two only contact through a number of protrusions 122, avoiding large-area heat transfer.

[0038] Furthermore, the height L of the support portion 32 is equal to the distance difference between the distance L1 from the lowest point of the nozzle tip 41 to the docking surface 10 and the distance L2 from the lowest point of the nozzle tip 41 to the surface of the template 2 when the installation is in place. In this way, it can be ensured that when the nozzle tip 41 is installed in the appropriate position, it is just supported by the support portion 32, and the supporting height is more reasonable.

[0039] Compared with metal materials, the guide sleeve 3 can use materials with a smaller thermal conductivity.

[0040] Compared with the prior art, this embodiment has the following beneficial effects:

[0041] The hot runner system realizes more accurate positioning of the manifold 1 and the target by setting the guide sleeve 3. By controlling the height of the guiding surface 30 of the guide sleeve 3, during the assembly process of the manifold 1 and the template 2, the contact positioning between the guide sleeve 3 and the manifold 1 precedes the contact between the tip 41 of the nozzle 4 and the mounting hole 22. As a result, after the manifold 1 is positioned first, the tip 41 can be assembled into the mounting hole 22 in an accurate direction, and the tip 41 will not abut against the hole wall and be damaged, achieving a protective effect. Moreover, the manifold 1 and the template 2 are separated by the guide sleeve 3, reducing the heat transfer from the manifold 1 to the template 2 and minimizing heat loss.

[0042] In addition, the guide sleeve 3 also supports the manifold 1, reducing the use of a large number of washers.

[0043] And the U-shaped hole 11 that cooperates with the guide sleeve 3 comprehensively considers thermal deformation, leaving as much deformation space as possible, and its spatial layout enables uniform expansion in all directions, making the degree of deformation more controllable.

[0044] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0045] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hot runner system, comprising a template (2) and a manifold plate (1). A plurality of nozzles (4) are arranged on one side of the manifold plate (1) facing the template (2). The nozzle (4) includes a nozzle (4) body and a nozzle tip (41) arranged at the end of the nozzle (4) body. The template (2) includes a receiving cavity (21) and a mounting hole (22) that penetrate through in sequence. The aperture of the receiving cavity (21) is larger than the aperture of the mounting hole (22). The nozzle (4) passes through the receiving cavity (21) until the nozzle tip (41) passes through the mounting hole (22). Characterized in that, The hot runner system further includes a guide sleeve (3). The guide sleeve (3) is fixed to the template (2) and faces the manifold plate (1). The manifold plate (1) is provided with a guide hole for accommodating the guide sleeve (3). The manifold plate (1) includes a docking surface (10) adjacent to the guide hole and facing the template (2). The guide hole is provided as a U-shaped hole (11), and the notch (110) of its U-shape faces the outside. The template (2) includes an interface surface (20) located between the receiving cavity (21) and the mounting hole (22). The guide sleeve (3) includes a guide surface (30) facing the manifold plate (1). The height difference between the interface surface (20) and the guide surface (30) is greater than the height difference between the end of the nozzle tip (41) and the docking surface (10).

2. The hot runner system according to claim 1, Characterized in that, The hot runner system further includes a locking screw (5). The guide sleeve (3) includes a through hole (33). The template (2) includes a threaded hole (24) arranged opposite to the through hole (33). The locking screw (5) passes through the manifold plate (1), the guide sleeve (3) and the threaded hole (24) in sequence.

3. The hot runner system according to claim 2, Characterized in that, A heat insulation gasket (51) is arranged between the locking screw (5) and the manifold plate (1).

4. The hot runner system according to claim 1, Characterized in that, The manifold plate (1) includes a plurality of U-shaped holes (11). The connecting line direction between the notch (110) of each U-shaped hole (11) and the U-shaped bottom all faces the center of the manifold plate (1), and every two U-shaped holes (11) are symmetrically arranged on both sides of the center position.

5. The hot runner system according to claim 1, Characterized in that, The guide sleeve (3) includes a support portion (32). The height L of the support portion (32) is equal to the distance difference between the distance L1 between the lowest point of the nozzle tip (41) and the docking surface (10) and the distance L2 between the lowest point of the nozzle tip (41) and the surface of the template (2) when installed in place.

6. The hot runner system according to claim 1, Characterized in that, A positioning member (12) is arranged on one side of the manifold plate (1) facing the template (2). A positioning groove (23) for accommodating the positioning member (12) is arranged on the surface of the template (2).

7. The hot runner system according to claim 6, It is characterized in that a plurality of protrusions (122) are provided on the surface of the positioning member (12) and / or the positioning groove (23), and the flow dividing plate (1) and the template (2) are in contact only through the plurality of protrusions (122) at the positioning member (12).

8. The hot runner system according to claim 6 It is characterized in that the positioning member (12) includes a positioning cylinder (121), and the axis of the positioning cylinder (121) is arranged at the central position of the flow dividing plate (1).

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