Runner structure and injection mold

Abstract

The utility model provides a runner structure and an injection mold, the runner structure comprises a main runner, a first sub-runner, a second sub-runner, a first turnover runner, a third sub-runner and a second turnover runner, the first sub-runner extends along the transverse direction, and one end of the first sub-runner is communicated with the lower end of the main runner; the second sub-runner extends in the longitudinal direction; the two ends of the first overturning runner communicate with the end, away from the main runner, of the first sub-runner and the middle of the second sub-runner correspondingly, and the first overturning runner extends upwards firstly, then extends downwards in the transverse direction and finally extends downwards; the third sub-runners extend in the transverse direction, the two ends of each third sub-runner communicate with the two forming cavities correspondingly, and the number of the third sub-runners is two. The middle parts of the two third sub-runners are respectively communicated with the two ends of the second sub-runner through two second overturning runners; and the second overturning runners are arranged in a manner of extending upwards firstly, then extending downwards in the longitudinal direction and finally extending downwards. The runner structure can solve the problem of unbalanced filling of the multi-cavity injection mold.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of injection molding, and in particular to a flow channel structure and an injection mold. Background Art

[0002] In multi-cavity injection molds, the problem of unbalanced filling often occurs. The molding cavity closer to the injection gate of the injection mold is easier to fill, while the molding cavity farther away from the gate is difficult to fill. This is because the temperature of the plastic melt is the same before entering each molding cavity. However, as the plastic melt flows in the runner, due to laminar flow, the flow speed between each layer of molecules varies, resulting in shear friction and heat generation, making the melt temperature near the outside of the runner higher than the melt temperature in the center of the runner. In addition, the plastic melt in the runner will collide and bifurcate when passing through the lower runner, resulting in uneven temperature distribution within the runner, thus causing the problem of unbalanced filling of the multi-cavity. Utility Model Content

[0003] The purpose of the embodiments of the present utility model is to provide a flow channel structure and an injection mold, aiming to solve the problem of unbalanced filling of existing multi-cavity injection molds.

[0004] In order to solve the above technical problems, the embodiment of the present utility model provides a flow channel structure for an injection mold, wherein the flow channel structure includes a main flow channel and a unilateral flow channel, wherein the main flow channel is arranged to extend in the vertical direction, and the unilateral flow channel includes:

[0005] a first branch channel, the first branch channel being arranged to extend in a transverse direction, and one end of the first branch channel being connected to a lower end of the main channel;

[0006] a second branch channel, the second branch channel being arranged to extend in the longitudinal direction and being located on a side of the first branch channel away from the main channel;

[0007] a first reversing flow channel, wherein both ends of the first reversing flow channel are respectively connected to an end of the first branch flow channel away from the main flow channel and a middle portion of the second branch flow channel, and the first reversing flow channel extends upward, then laterally, and finally downward from an end of the first reversing flow channel connected to the first branch flow channel to an end of the first reversing flow channel connected to the second branch flow channel;

[0008] A third runner, the third runner extending in the transverse direction, with two ends of the third runner communicating with two molding cavities respectively, and two third runners being provided, the two third runners being located on both sides of the second runner in the longitudinal direction;

[0009] The second reversal flow channel, the middle parts of the two third branch channels are respectively connected to the two ends of the second branch channel through the two second reversal flow channels, from one end of the second reversal flow channel connected to the second branch channel to the end connected to the third branch channel, the second reversal flow channel is first extended upward, then along the longitudinal direction and finally downward.

[0010] Preferably, a plurality of the single-sided flow channels are provided, and the plurality of the single-sided flow channels are evenly spaced apart along the circumference of the main flow channel.

[0011] Preferably, two single-sided flow channels are provided, and the two single-sided flow channels are symmetrically arranged with respect to the main flow channel in the transverse direction.

[0012] Preferably, the first branch channel, the second branch channel, and the third branch channel are arranged flush with each other.

[0013] Preferably, the single-sided flow channel is symmetrically arranged with respect to the first branch flow channel in the longitudinal direction.

[0014] Preferably, each of the third branch channels has a first connecting position, a second connecting position, and a third connecting position, the first connecting position is connected to the second inversion channel, the second connecting position and the third connecting position are connected to the two molding cavities respectively, and the distance from the first connecting position to the second connecting position is equal to the distance from the first connecting position to the third connecting position.

[0015] Preferably, both ends of each of the third branch channels are connected to the two molding cavities via two injection channels extending in the longitudinal direction.

[0016] Preferably, the first turnover flow channel comprises:

[0017] a first ascending section, the first ascending section extending in an up-down direction, the lower end of the first ascending section being connected to an end of the first branch channel away from the main channel;

[0018] a first horizontal section, wherein the first horizontal section is arranged to extend in a transverse direction, one end of the first horizontal section is connected to the upper end of the first ascending section, and an arc-shaped transition is formed between the first horizontal section and the first ascending section;

[0019] The first descending section is extended in the up and down directions, the upper end of the first descending section is connected to the end of the first horizontal section away from the first ascending section, the first descending section and the first horizontal section are transitioned in an arc shape, and the lower end of the first descending section is connected to the middle part of the second branch channel.

[0020] Preferably, the second turnover flow channel comprises:

[0021] a second ascending section, the second ascending section extending in an up-down direction, the lower end of the second ascending section being connected to one end of the second branch channel;

[0022] a second horizontal section, the second horizontal section extending longitudinally, one end of the second horizontal section connected to the upper end of the second ascending section, and an arc-shaped transition between the second horizontal section and the second ascending section;

[0023] The second descending section is extended in the up and down directions, the upper end of the second descending section is connected to the end of the second horizontal section away from the second ascending section, the second descending section and the second horizontal section are transitioned in an arc shape, and the lower end of the second descending section is connected to the middle part of the third branch channel.

[0024] In order to achieve the above-mentioned purpose, the utility model also provides an injection mold, comprising the above-mentioned flow channel structure.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The single-sided runner of the runner structure of the utility model is provided with a first reversal runner and a second reversal runner. The plastic melt entering from the main runner flows through the single-sided runner and is injected into the four molding cavities on the single side. The single-sided runner is formed with two diversion positions. The first reversal runner and the second reversal runner are respectively provided at the two diversion positions of the single-sided runner, so that the plastic melt can be buffered and redistributed twice at the two diversion positions of the single-sided runner, so that the plastic melt can fill the four molding cavities on the single side more evenly, thereby solving the problem of unbalanced filling of multi-cavity injection molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 This is a schematic structural diagram of the flow channel structure in an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0030] Description of the accompanying drawings of this utility model:

[0031] Runner structure 1000, main channel 100, single-side runner 200, first branch runner 210, second branch runner 220, first reversing runner 230, first ascending section 231, first horizontal section 232, first descending section 233, third branch runner 240, second reversing runner 250, second ascending section 251, second horizontal section 252, second descending section 253, injection runner 260, molding cavity 300, first molding cavity 300a, second molding cavity 300b.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In order to solve the problem of unbalanced filling of multi-cavity injection molds, the utility model provides a flow channel structure, which can be used in injection molds. Figure 1 and Figure 2 A preferred embodiment of the flow channel structure provided by the present utility model is shown.

[0037] See also Figure 1 and Figure 2In this embodiment, the flow channel structure 1000 includes a main flow channel 100 and a unilateral flow channel 200. The main flow channel 100 is extended in the up-down direction, and the unilateral flow channel 200 includes a first branch flow channel 210, a second branch flow channel 220, a first reversing flow channel 230, a third branch flow channel 240 and a second reversing flow channel 250. The first branch flow channel 210 is extended in the transverse direction, and one end of the first branch flow channel 210 is connected to the lower end of the main flow channel 100; the second branch flow channel 220 is extended in the longitudinal direction, and the second branch flow channel 220 is located on the side of the first branch flow channel 210 away from the main flow channel 100; the two ends of the first reversing flow channel 230 are respectively connected to the end of the first branch flow channel 210 away from the main flow channel 100 and the middle of the second branch flow channel 220, The channel 230 connects one end of the first branch channel 210 to one end connected to the second branch channel 220, and the first reversing channel 230 is first extended upward and then along the horizontal direction and finally extended downward; the third branch channel 240 is extended along the horizontal direction, and the two ends of the third branch channel 240 are respectively connected to the two molding cavities 300. There are two third branch channels 240, and the two third branch channels 240 are located on both sides of the second branch channel 220 in the longitudinal direction; the middle parts of the two third branch channels 240 are respectively connected to the two ends of the second branch channel 220 through two second reversing channels 250, and from one end of the second reversing channel 250 connecting the second branch channel 220 to one end connecting the third branch channel 240, the second reversing channel 250 is first extended upward and then along the longitudinal direction and finally extended downward.

[0038] Specifically, the upper end of the main channel 100 is connected to the pouring port of the injection mold, allowing the plastic melt to be injected into the runner structure 1000 from the upper end of the main channel 100. The unilateral runner 200 is located on one side of the main channel 100 in the horizontal direction. The unilateral runner 200 is connected to the lower end of the main channel 100 and the four molding cavities 300 on one side. The plastic melt injected into the runner structure 1000 can flow through the main channel 100 and the unilateral runner 200 in sequence before being injected into the four molding cavities 300 on one side. The four molding cavities 300 on a single side are arranged in a square shape along the horizontal and vertical directions. Hereinafter, the two molding cavities 300 located away from the main channel 100 are defined as the two first molding cavities 300a, which are longitudinally opposed to each other. The two molding cavities 300 located closer to the main channel 100 are defined as the two second molding cavities 300b, which are longitudinally opposed to each other and transversely opposed to each other. Each of the three branch channels 240 is connected to the first molding cavity 300a and the second molding cavity 300b at its two ends.

[0039] In the single-sided runner 200, the plastic melt can enter the first branch runner 210 from the lower end of the main runner 100. When the plastic melt flows from the first branch runner 210 into the second branch runner 220, it undergoes a diversion, allowing the plastic melt in the second branch runner 220 to be diverted into the two third branch runners 240. A first reversing runner 230 is provided at the diversion position between the first branch runner 210 and the second branch runner 220. The plastic melt in the first branch runner 210 flows through the first reversing runner 230 and then enters the second branch runner 220. The plastic melt undergoes a reversal in the first reversing runner 230 to buffer and redistribute the plastic melt entering the second branch runner 220, so that the plastic melt in the second branch runner 220 can flow evenly into the two third branch runners 240.

[0040] When the plastic melt flows from the second branch channel 220 into the third branch channel 240 on one side, it undergoes a secondary diversion, allowing the plastic melt in the third branch channel 240 to be diverted into a first molding cavity 300a and a second molding cavity 300b. A second reversing channel 250 is provided at the diversion location between the second branch channel 220 and the third branch channel 240 on one side. The plastic melt in the second branch channel 220 flows through the second reversing channel 250 and enters the third branch channel 240 on one side. The plastic melt undergoes a secondary reversal in the second reversing channel 250 to buffer and redistribute the plastic melt entering the third branch channel 240 on one side, allowing the plastic melt in the third branch channel 240 on one side to flow evenly into the first molding cavity 300a and the second molding cavity 300b at both ends. In this way, a reversing flow channel is provided at each diversion position of the single-sided flow channel 200, so that the plastic melt can fill the four molding cavities 300 on one side more evenly after flowing through the single-sided flow channel 200, thereby solving the problem of unbalanced filling of the multi-cavity injection mold.

[0041] The single-sided runner 200 of the runner structure 1000 of the present invention is provided with a first reversal runner 230 and a second reversal runner 250. The plastic melt entering from the main runner 100 flows through the single-sided runner 200 and is injected into the four molding cavities 300 on a single side. The single-sided runner 200 is formed with two diversion positions. The first reversal runner 230 and the second reversal runner 250 are respectively provided at the two diversion positions of the single-sided runner 200, so that the plastic melt can be buffered and redistributed twice at the two diversion positions of the single-sided runner 200, so that the plastic melt can fill the four molding cavities 300 on a single side more evenly, thereby solving the problem of unbalanced filling of multi-cavity injection molds.

[0042] Optionally, see Figure 1 and Figure 2In this embodiment, a plurality of single-sided flow channels 200 are provided, and the plurality of single-sided flow channels 200 are evenly spaced apart along the circumference of the main flow channel 100 .

[0043] Specifically, there are N single-sided runners 200 (N is a positive integer, N≥2), each single-sided runner 200 is connected to four molding cavities 300, and N single-sided runners 200 are connected to 4N molding cavities 300. In this way, the runner structure 1000 is connected to 4N molding cavities 300 at the same time, and the plastic melt can be filled into the 4N molding cavities 300 more evenly.

[0044] The specific number of the single-side flow channels 200 can be set according to actual conditions. For example, the single-side flow channels 200 can be set with two, three, four or more. Figure 1 and Figure 2 In this embodiment, two single-sided flow channels 200 are provided, and the two single-sided flow channels 200 are arranged symmetrically with respect to the main flow channel 100 in the transverse direction. In this way, the flow channel structure 1000 simultaneously connects eight molding cavities 300, and can fill the eight molding cavities 300 with plastic melt more evenly.

[0045] In the single-sided flow channel 200, the first branch flow channel 210, the second branch flow channel 220, and the third branch flow channel 240 can be arranged flush with each other, or they can be arranged staggered in height. Figure 1 and Figure 2 In this embodiment, the first branch runner 210, the second branch runner 220, and the third branch runner 240 are arranged flush with each other. Such a runner structure 1000 is relatively easy to process in an injection mold.

[0046] Optionally, see Figure 1 and Figure 2 In this embodiment, the single-sided flow channel 200 is symmetrically arranged with respect to the first branch flow channel 210 in the longitudinal direction. This facilitates the plastic melt in the single-sided flow channel 200 to be more evenly distributed to the two third branch flow channels 240.

[0047] Optionally, see Figure 1 and Figure 2 In this embodiment, each third branch runner 240 has a first connection position, a second connection position, and a third connection position. The first connection position connects to the second reversing runner 250, while the second and third connection positions connect to two molding cavities 300, respectively. The distance from the first connection position to the second connection position is equal to the distance from the first connection position to the third connection position. This facilitates the uniform flow of the plastic melt within a single third branch runner 240 to the first and second molding cavities 300a, 300b, respectively, located at either end.

[0048] Optionally, see Figure 1 and Figure 2 In this embodiment, the two ends of each third branch runner 240 are connected to the two molding cavities 300 through two injection runners 260 extending in the longitudinal direction. In this way, a gate can be formed at the connection between the injection runner 260 and the molding cavity 300.

[0049] The plastic melt can first flow upward, then flow horizontally, and finally flow downward in the first reversal flow channel 230, thereby forming a reversal of the plastic melt in the single-sided flow channel 200. Figure 1 and Figure 2 In this embodiment, the first reversing flow channel 230 includes a first ascending section 231, a first horizontal section 232 and a first descending section 233. The first ascending section 231 is extended in the up-down direction, and the lower end of the first ascending section 231 is connected to the end of the first branch channel 210 away from the main channel 100; the first horizontal section 232 is extended in the transverse direction, and one end of the first horizontal section 232 is connected to the upper end of the first ascending section 231, and a circular arc transition is formed between the first horizontal section 232 and the first ascending section 231; the first descending section 233 is extended in the up-down direction, and the upper end of the first descending section 233 is connected to the end of the first horizontal section 232 away from the first ascending section 231, and a circular arc transition is formed between the first descending section 233 and the first horizontal section 232, and the lower end of the first descending section 233 is connected to the middle part of the second branch channel 220.

[0050] Specifically, the plastic melt in the first branch channel 210 enters the first inverting channel 230, and will first flow upward along the first ascending section 231 into the first horizontal section 232, then flow horizontally along the first horizontal section 232 into the first descending section 233, and finally flow downward along the first descending section 233 into the second branch channel 220. The two corners of the first inverting channel 230 are both arranged in an arc-shaped transition. This not only avoids stress concentration at the corners of the first inverting channel 230, but also reduces the resistance encountered by the plastic melt in the first inverting channel 230.

[0051] The plastic melt can first flow upward, then flow longitudinally, and finally flow downward in the second reversal flow channel 250, thereby forming a secondary reversal of the plastic melt in the single-sided flow channel 200. Figure 1 and Figure 2In this embodiment, the second turning flow channel 250 includes a second ascending section 251, a second horizontal section 252 and a second descending section 253. The second ascending section 251 is extended in the up-down direction, and the lower end of the second ascending section 251 is connected to one end of the second branch channel 220; the second horizontal section 252 is extended in the longitudinal direction, and one end of the second horizontal section 252 is connected to the upper end of the second ascending section 251, and a circular arc transition is formed between the second horizontal section 252 and the second ascending section 251; the second descending section 253 is extended in the up-down direction, and the upper end of the second descending section 253 is connected to the end of the second horizontal section 252 away from the second ascending section 251, and a circular arc transition is formed between the second descending section 253 and the second horizontal section 252, and the lower end of the second descending section 253 is connected to the middle part of the third branch channel 240.

[0052] Specifically, the plastic melt in the second branch channel 220 enters the second inverted flow channel 250, and will first flow upward along the second ascending section 251 into the second horizontal section 252, then flow longitudinally along the second horizontal section 252 into the second descending section 253, and finally flow downward along the second descending section 253 into the third branch channel 240. The two corners of the second inverted flow channel 250 are both arranged in an arc-shaped transition. This not only avoids stress concentration at the corners of the second inverted flow channel 250, but also reduces the resistance encountered by the plastic melt in the second inverted flow channel 250.

[0053] The utility model further provides an injection mold, which includes a flow channel structure. Since the flow channel structure adopts the technical solution of the above embodiment, it has the beneficial effects brought by the technical solution of the above embodiment.

[0054] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A flow channel structure for an injection mold, characterized in that: The flow channel structure includes a main flow channel and a unilateral flow channel, wherein the main flow channel is arranged to extend in an up-down direction, and the unilateral flow channel includes: a first branch channel, the first branch channel being arranged to extend in a transverse direction, and one end of the first branch channel being connected to a lower end of the main channel; a second branch channel, the second branch channel being arranged to extend in the longitudinal direction and being located on a side of the first branch channel away from the main channel; a first reversing flow channel, wherein both ends of the first reversing flow channel are respectively connected to an end of the first branch flow channel away from the main flow channel and a middle portion of the second branch flow channel, and the first reversing flow channel extends upward, then laterally, and finally downward from an end of the first reversing flow channel connected to the first branch flow channel to an end of the first reversing flow channel connected to the second branch flow channel; A third runner, the third runner extending in the transverse direction, with two ends of the third runner communicating with two molding cavities respectively, and two third runners being provided, the two third runners being located on both sides of the second runner in the longitudinal direction; The second reversal flow channel, the middle parts of the two third branch channels are respectively connected to the two ends of the second branch channel through the two second reversal flow channels, from one end of the second reversal flow channel connected to the second branch channel to the end connected to the third branch channel, the second reversal flow channel is first extended upward, then along the longitudinal direction and finally downward.

2. The flow channel structure according to claim 1, wherein: A plurality of the single-sided flow channels are provided, and the plurality of the single-sided flow channels are evenly spaced and arranged along the circumference of the main flow channel.

3. The flow channel structure according to claim 2, wherein: There are two single-sided flow channels, and the two single-sided flow channels are symmetrically arranged with respect to the main flow channel in the transverse direction.

4. The flow channel structure according to claim 1, wherein: The first branch flow channel, the second branch flow channel, and the third branch flow channel are arranged flush with each other.

5. The flow channel structure according to claim 1, wherein: The single-sided flow channel is symmetrically arranged with respect to the first branch flow channel in the longitudinal direction.

6. The flow channel structure according to claim 1, wherein: Each of the third branch channels has a first connecting position, a second connecting position, and a third connecting position. The first connecting position is connected to the second inversion channel, and the second connecting position and the third connecting position are connected to the two molding cavities respectively. The distance from the first connecting position to the second connecting position is equal to the distance from the first connecting position to the third connecting position.

7. The flow channel structure according to claim 1, wherein: Both ends of each of the third branch channels are connected to the two molding cavities through two injection channels extending in the longitudinal direction.

8. The flow channel structure according to claim 1, wherein: The first reversal flow channel includes: a first ascending section, the first ascending section extending in an up-down direction, the lower end of the first ascending section being connected to an end of the first branch channel away from the main channel; a first horizontal section, wherein the first horizontal section is arranged to extend in a transverse direction, one end of the first horizontal section is connected to the upper end of the first ascending section, and an arc-shaped transition is formed between the first horizontal section and the first ascending section; The first descending section is extended in the up and down directions, the upper end of the first descending section is connected to the end of the first horizontal section away from the first ascending section, the first descending section and the first horizontal section are transitioned in an arc shape, and the lower end of the first descending section is connected to the middle part of the second branch channel.

9. The flow channel structure according to claim 1, wherein: The second reversal flow channel includes: a second ascending section, the second ascending section extending in an up-down direction, the lower end of the second ascending section being connected to one end of the second branch channel; a second horizontal section, the second horizontal section extending longitudinally, one end of the second horizontal section connected to the upper end of the second ascending section, and an arc-shaped transition between the second horizontal section and the second ascending section; The second descending section is extended in the up and down directions, the upper end of the second descending section is connected to the end of the second horizontal section away from the second ascending section, the second descending section and the second horizontal section are transitioned in an arc shape, and the lower end of the second descending section is connected to the middle part of the third branch channel.

10. An injection mold, characterized in that: The invention comprises the flow channel structure according to any one of claims 1 to 9.

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