Injection mold runner stirring structure and multi-mold-cavity plastic mold

Abstract

The utility model provides an injection mold runner stirring structure and a multi-mold-cavity plastic mold, and relates to the technical field of injection molds, melt glue in an injection mold runner flows along a bent runner and an inclined runner respectively, and the flowing direction of the melt glue can be changed due to the fact that the bent runner is bent, so that the flow direction of the melt glue can be changed. The melt flowing out of the bent runner and the melt flowing out of the inclined runner are crossed and fused to complete stirring, so that the melt becomes uniform again, and the problems that in the prior art, shearing is generated when a multi-mold-cavity plastic mold flows in the runners, temperature difference is generated due to shearing heat, the flow speed difference is generated, and the product quality is influenced are solved. And a flow imbalance phenomenon is caused.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold flow channel stirring structure and a multi-cavity plastic mold. Background Art

[0002] In existing runner multi-cavity plastic molds, even under the design of completely symmetrical and balanced geometric dimensions, there will still be flow imbalance. This is because the molten plastic flowing in the runner will produce shear, and shear generates heat, which will cause a temperature difference between the molten plastic on the runner wall and the center. The temperature difference causes a difference in the viscosity of the sol inside and outside, and then a speed difference occurs. After the molten plastic enters the branch runner, the inner cavity is filled faster and the outer cavity is filled slower. This flow imbalance phenomenon is sometimes very significant, seriously affecting the product weight and size consistency of each cavity, thereby reducing the quality of the product. Utility Model Content

[0003] The purpose of the utility model is to provide an injection mold runner stirring structure and a multi-cavity plastic mold, so as to alleviate the technical problem existing in the prior art that the multi-cavity plastic mold will produce shear when flowing in the runner, the shear heat will generate temperature difference, resulting in difference in flow rate and causing flow imbalance.

[0004] In a first aspect, the utility model provides an injection mold runner stirring structure, wherein the stirring structure is arranged on the injection mold runner;

[0005] The stirring structure includes a bent flow channel and an inclined flow channel;

[0006] The bent flow channel is bent and used to change the flow direction of the molten plastic in the injection mold flow channel;

[0007] The liquid outlet direction of the bent flow channel is arranged to intersect with the liquid outlet direction of the inclined flow channel.

[0008] In an alternative embodiment,

[0009] The bent flow channel includes a liquid inlet section and a liquid outlet section;

[0010] The liquid inlet section and the liquid outlet section are arranged along the flow direction of the molten plastic in the injection mold flow channel;

[0011] The liquid inlet section and the liquid outlet section are arranged at an angle.

[0012] In an alternative embodiment,

[0013] The flow direction of the inclined flow channel is arranged at an angle to the flow direction of the injection mold flow channel.

[0014] In an alternative embodiment,

[0015] The flow direction of the liquid outlet section is arranged to intersect with the flow direction of the inclined flow channel.

[0016] In a second aspect, the multi-cavity plastic mold provided by the utility model comprises a main flow channel and the injection mold flow channel stirring structure;

[0017] The injection mold flow channel stirring structure is arranged on the main flow channel.

[0018] In an alternative embodiment,

[0019] An injection port is arranged in the middle of the main channel, and the molten plastic enters the main channel through the injection port.

[0020] In an alternative embodiment,

[0021] The injection mold runner stirring structures are provided with two, and the two injection mold runner stirring structures are symmetrically arranged on the main runner relative to the injection port.

[0022] In an alternative embodiment,

[0023] The multi-cavity plastic mold further includes a runner;

[0024] The branch runner is communicated with the main runner, and the main runner is sequentially provided with the injection mold runner stirring structure and the branch runner along the flow direction of the molten plastic.

[0025] In an alternative embodiment,

[0026] There are two branch flow channels, and the two branch flow channels are symmetrically arranged on the main flow channel relative to the injection port.

[0027] In an alternative embodiment,

[0028] The multi-cavity plastic mold further includes a secondary runner;

[0029] The secondary flow channel is communicated with the branch flow channel, and the secondary flow channel is provided with a glue outlet for discharging the molten glue to form a product.

[0030] The utility model provides an injection mold runner stirring structure, and the molten glue in the injection mold runner flows along the bent runner and the inclined runner respectively. Since the bent runner is bent, it can change the flow direction of the molten glue, so that the molten glue flowing out of the bent runner and the molten glue flowing out of the inclined runner cross-fuse, complete the stirring, and make the molten glue uniform again, which alleviates the technical problem in the prior art that multi-cavity plastic molds will produce shear when flowing in the runner, the shear heat generates temperature difference, resulting in difference in flow rate and flow imbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the overall structure of the injection mold runner stirring structure provided by an embodiment of the utility model;

[0033] Figure 2 A schematic diagram of the flow of molten plastic in a flow channel stirring structure of an injection mold provided by an embodiment of the utility model;

[0034] Figure 3 A schematic diagram of the overall structure of a multi-cavity plastic mold provided in an embodiment of the utility model.

[0035] Icons: 100-stirring structure; 110-bent flow channel; 111-liquid inlet section; 112-liquid outlet section; 120-inclined flow channel; 200-main channel; 300-injection port; 400-diverter channel; 500-secondary flow channel; 600-product. DETAILED DESCRIPTION

[0036] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the prior art, during the flow of the molten plastic in the main flow channel, the molten plastic near the side wall of the flow channel generates shear with the side wall of the flow channel, and the shear generates heat, causing the temperature of the molten plastic to rise. After the temperature rises, the viscosity of the molten plastic decreases and the flow rate increases. The molten plastic in the middle of the main flow channel does not contact the side wall of the flow channel, and almost no shear is generated. The temperature is lower than that of the molten plastic near the side wall, and the flow rate is slower. At this time, uneven flow between the center of the molten plastic and the side wall occurs, and then when it flows into the branch flow channel, it is divided into two unbalanced and asymmetric molten plastics, which effectively affects the product quality.

[0038] In view of this, if Figure 1 , Figure 2 As shown, Figure 2The arrow in the figure indicates the flow direction of the molten plastic. The injection mold runner stirring structure 100 provided in this embodiment is arranged on the injection mold runner. It should be noted that a plurality of stirring structures 100 may be provided, and the plurality of stirring structures 100 are arranged at intervals along the flow direction of the injection mold runner to perform multiple stirring operations.

[0039] The stirring structure 100 specifically includes a curved flow channel 110 and an inclined flow channel 120; the molten glue in the flow channel of the injection mold is divided along the flow direction into the curved flow and inclined flow channels 120, the curved flow channel 110 is curved, and the molten glue moves along the curved flow channel 110. Since the shape of the curved flow channel 110 is curved, the flow direction of the molten glue is changed, and the molten glue flowing out of the curved flow channel 110 flows toward the center of the flow channel, and the liquid outlet direction of the curved flow channel 110 is arranged to intersect with the liquid outlet direction of the inclined flow channel 120, so that the molten glue flowing out of the curved flow channel 110 and the molten glue flowing out of the inclined flow channel 120 can be circulated and cross-fused to complete the stirring, so that the molten glue becomes uniform again.

[0040] The injection mold runner stirring structure 100 provided in the present embodiment is such that the molten plastic in the injection mold runner flows along the curved runner 110 and the inclined runner 120 respectively. Since the curved runner 110 is curved, it can change the flow direction of the molten plastic, so that the molten plastic flowing out of the curved runner 110 and the molten plastic flowing out of the inclined runner 120 cross-fuse, thereby completing the stirring and making the molten plastic uniform again. This alleviates the technical problem in the prior art that the multi-cavity plastic mold flowing in the runner will generate shear, the shear heat will generate temperature difference, the flow rate will be different, and the flow imbalance will occur.

[0041] On the basis of the above embodiments, in an optional implementation manner, the curved channel 110 in the injection mold runner stirring structure 100 provided in this embodiment includes a liquid inlet section 111 and a liquid outlet section 112; the liquid inlet section 111 and the liquid outlet section 112 are arranged along the molten plastic flow direction in the injection mold runner; the liquid inlet section 111 and the liquid outlet section 112 are arranged at an angle.

[0042] Specifically, the curved flow channel 110 is divided into a liquid inlet section 111 and a liquid outlet section 112. The molten plastic flow direction of the liquid inlet section 111 is set at an angle to the flow direction of the injection mold flow channel, so that the molten plastic in the liquid inlet section 111 flows away from the central axis of the injection mold flow channel.

[0043] Since the liquid inlet section 111 and the liquid outlet section 112 are arranged at an angle, the molten plastic in the liquid inlet section 111 changes its flow direction when entering the liquid outlet section 112, and the molten plastic flow direction of the liquid outlet section 112 is arranged at an angle to the flow direction of the injection mold runner, so that the molten plastic in the liquid outlet section 112 flows in a direction close to the central axis of the injection mold runner.

[0044] The arrangement of the liquid inlet section 111 and the liquid outlet section 112 allows the molten plastic flowing from the injection mold flow channel to first flow in a direction away from the central axis of the injection mold flow channel, and then flow in a direction close to the central axis of the injection mold flow channel.

[0045] In an optional embodiment, the flow direction of the inclined flow channel 120 is arranged at an angle to the flow direction of the injection mold flow channel.

[0046] Specifically, the inclined flow channel 120 is a straight flow channel, and the flow direction of the inclined flow channel 120 is set at an angle to the flow direction of the injection mold flow channel. The molten plastic flowing into the injection mold flow channel flows along the inclined flow channel 120, and the molten plastic in the inclined flow channel 120 flows in a direction away from the central axis of the injection mold flow channel.

[0047] In addition, it should be noted that the inclined flow channel 120 and the bent flow channel 110 may be provided in multiple groups, for example Figure 1 and Figure 2 As shown, two inclined flow channels 120 are provided, and two bent flow channels 110 are provided. The two inclined flow channels 120 are provided close to the axis of the injection mold flow channel, and the bent flow channels 110 are provided on both sides of the two inclined flow channels 120 .

[0048] In an optional embodiment, the flow direction of the liquid outlet section 112 is arranged to intersect with the flow direction of the inclined flow channel 120, so that the molten glue flowing out of the liquid outlet section 112 and the molten glue flowing out of the inclined flow channel 120 can cross-merge and complete stirring to make the molten glue uniform again.

[0049] In summary, the injection mold runner stirring structure 100 provided in the present embodiment, the molten glue in the injection mold runner, the molten glue near the center of the injection mold runner is a low-shear, low-speed, and low-temperature molten glue, and the molten glue near the side wall of the injection mold runner is a high-shear, high-speed, and high-temperature molten glue. The low-shear, low-speed, and low-temperature molten glue is closer to the inside and enters the inclined runner 120, and the high-shear, high-speed, and high-temperature molten glue is closer to the outside and enters the curved runner 110. The flow direction of the molten glue is changed through the inclined runner 120 and the curved runner 110, so that the high-shear, high-speed, and high-temperature molten glue and the low-shear, low-speed, and low-temperature molten glue intersect and merge with each other to complete the stirring. In addition, the stirring structure 100 will not produce a backflow phenomenon, and has little effect on the injection pressure loss.

[0050] Based on the above embodiments, Figure 3 As shown, the multi-cavity plastic mold provided in this embodiment includes a main channel 200 and an injection mold runner stirring structure 100 ; the injection mold runner stirring structure 100 is disposed on the main channel 200 .

[0051] Specifically, the main channel 200 is the injection mold flow channel mentioned above. According to the length of the main channel 200 and the flow rate of the molten plastic, a plurality of stirring structures 100 may be actually provided. The plurality of stirring structures 100 are evenly spaced along the molten plastic flow direction of the main channel 200 to ensure that the molten plastic in the main channel 200 is more uniform.

[0052] In an optional embodiment, an injection port 300 is disposed in the middle of the main channel 200 , and the molten plastic enters the main channel 200 through the injection port 300 .

[0053] Specifically, the injection port 300 may be a columnar structure, one end of the injection port 300 is connected to the middle opening of the main channel 200 , and the other end of the injection port 300 is used for the inflow of molten plastic, and the molten plastic flows into the main channel 200 along the injection port 300 .

[0054] In an optional embodiment, in order to save costs and make the molten glue at both ends of the main channel 200 more uniform, two injection mold runner stirring structures 100 are provided, and the two injection mold runner stirring structures 100 are symmetrically arranged on the main channel 200 relative to the injection port 300.

[0055] In an optional embodiment, the multi-cavity plastic mold further includes a branch channel 400; the branch channel 400 is connected to the main channel 200, and the main channel 200 is sequentially provided with an injection mold runner stirring structure 100 and a branch channel 400 along the flow direction of the molten plastic.

[0056] Specifically, the injection mold runner stirring structure 100 is disposed on one end of the main runner 200 close to the branch runner 400 , and the molten plastic after cross-fusion and stirring of the injection mold runner enters the branch runner 400 and flows along the branch runner 400 .

[0057] It should be noted that there can be multiple branch channels 400, all of which are connected to the main channel 200. Preferably, there can be two branch channels 400, which are respectively arranged on both sides of the main channel 200 near the end, and the two branch channels 400 are symmetrically arranged to make the molten glue flow more uniform.

[0058] In an optional embodiment, the multi-cavity plastic mold further includes a secondary runner 500 ; the secondary runner 500 is connected to the branch runner 400 , and the secondary runner 500 is provided with a glue outlet for discharging the molten glue to form a product 600 .

[0059] Specifically, a secondary flow channel 500 is provided at the end of each branch flow channel 400. For example, if there are two branch flow channels 400, then a secondary flow channel 500 is provided at the end of the two branch flow channels 400, and a total of four secondary flow channels 500 are provided. A molten glue outlet is provided on the secondary flow channel 500, and a molten glue product 600 is formed at the molten glue outlet.

[0060] In addition, it should be noted that the injection mold runner stirring structure 100 can also be set on the branch runner 400 and the secondary runner 500, and the specific number of the injection mold runner stirring structure 100 is selected according to actual needs.

[0061] In the multi-cavity plastic mold provided in this embodiment, the molten plastic enters the main channel 200 from the injection port 300, passes through the runner, and then enters the plastic part cavity through the gate; when the molten plastic enters the stirring structure 100 through the main channel 200, the outer molten plastic and the central molten plastic in the horizontal direction are guided to different channels, thereby changing the direction of the runner, and cross-fusion occurs when they meet again, completing the stirring and making the molten plastic uniform again.

[0062] The molten plastic entering the branch channel 400 is uniform, so the molten plastic entering the secondary branch channel 400 is divided into two balanced and symmetrical molten plastics, so that the weight of the product 600 in each cavity is consistent and reaches a balanced state.

[0063] This embodiment only adds a stirring mechanism to the main flow channel 200 in the horizontal direction, so it can only make the molten glue in the secondary flow channel 400 symmetrical, and each molten glue is not completely uniform. If each molten glue is to be uniform, it is necessary to design a stirring structure 100 in the vertical flow channel 400. Since flow balance has been achieved, no additional design is required to avoid unnecessary cost. However, in some cases, stirring structures 100 can be added in two directions at the same time to achieve that each molten glue is completely uniform before entering the plastic part cavity.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An injection mold runner stirring structure, characterized in that: The stirring structure (100) is arranged on the flow channel of the injection mold; The stirring structure (100) comprises a bent flow channel (110) and an inclined flow channel (120); The bent flow channel (110) is bent and used to change the flow direction of the molten plastic in the injection mold flow channel; The liquid outlet direction of the bent flow channel (110) is arranged to intersect with the liquid outlet direction of the inclined flow channel (120).

2. The injection mold runner stirring structure according to claim 1, characterized in that: The bent flow channel (110) comprises a liquid inlet section (111) and a liquid outlet section (112); The liquid inlet section (111) and the liquid outlet section (112) are arranged along the flow direction of the molten plastic in the injection mold flow channel; The liquid inlet section (111) and the liquid outlet section (112) are arranged at an angle.

3. The injection mold runner stirring structure according to claim 2, characterized in that: The flow direction of the inclined flow channel (120) is arranged at an angle to the flow direction of the injection mold flow channel.

4. The injection mold runner stirring structure according to claim 3, characterized in that: The flow direction of the liquid outlet section (112) is arranged to intersect with the flow direction of the inclined flow channel (120).

5. A multi-cavity plastic mold, characterized in that: It comprises a main flow channel (200) and an injection mold flow channel stirring structure (100) as claimed in any one of claims 1 to 4; The injection mold flow channel stirring structure (100) is arranged on the main flow channel (200).

6. The multi-cavity plastic mold according to claim 5, characterized in that: An injection port (300) is provided in the middle of the main channel (200), and the molten plastic enters the main channel (200) through the injection port (300).

7. The multi-cavity plastic mold according to claim 6, characterized in that: Two injection mold flow channel stirring structures (100) are provided, and the two injection mold flow channel stirring structures (100) are symmetrically arranged on the main flow channel (200) relative to the injection port (300).

8. The multi-cavity plastic mold according to claim 6, characterized in that: The multi-cavity plastic mold further includes a runner (400); The branch runner (400) is in communication with the main runner (200), and the main runner (200) is provided with the injection mold runner stirring structure (100) and the branch runner (400) in sequence along the flow direction of the molten plastic.

9. The multi-cavity plastic mold according to claim 8, characterized in that: Two branch flow channels (400) are provided, and the two branch flow channels (400) are symmetrically arranged on the main flow channel (200) relative to the injection port (300).

10. The multi-cavity plastic mold according to claim 9, characterized in that: The multi-cavity plastic mold further includes a secondary runner (500); The secondary flow channel (500) is in communication with the branch flow channel (400), and the secondary flow channel (500) is provided with a glue outlet for discharging the molten glue to form a product (600).

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