Injection mold capable of adjusting flow speed

Abstract

The utility model relates to the technical field of injection molds, and discloses an injection mold capable of adjusting flow velocity, which comprises a mold plate, a pouring gate is arranged on the mold plate, and the pouring gate comprises a main runner and a plurality of branch runners communicated with the main runner; and the adjusting structure comprises a plurality of flow stopping pieces which are movably arranged on the sub-runners, and when the flow stopping pieces move in the direction perpendicular to the sub-runners, the opening degree of the sub-runners can be adjusted. The injection mold capable of adjusting the flow speed is simple in structure, low in production cost and capable of improving the forming quality of products.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and particularly relates to an injection mold with adjustable flow rate. Background Art

[0002] As an indispensable part of plastic product production, the rationality and efficiency of the design of injection molds directly affect the quality and production efficiency of products. In the pouring process of traditional injection molds, the flow rate of the runner is usually fixed, which results in inconsistent filling speeds at different parts during the injection process, and may cause problems such as uneven internal stress distribution and large shrinkage rate differences in the product, thereby affecting the dimensional accuracy and appearance quality of the product. Especially when producing products with complex shapes and uneven wall thicknesses, the pouring method with a fixed flow rate is difficult to meet the requirements of high-quality production. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an injection mold with a simple structure, low production cost, and adjustable flow rate for the problems existing in the prior art.

[0004] The purpose of the utility model can be achieved by the following technical solutions. An injection mold with adjustable flow rate includes:

[0005] A template, on which a runner is provided, and the runner includes a main runner and a plurality of sub-runners communicated with the main runner;

[0006] An adjusting structure, which includes a plurality of flow-stopping members movably arranged on the sub-runners. When the flow-stopping members move in a direction perpendicular to the sub-runners, the opening degree of the sub-runners can be adjusted.

[0007] In the above injection mold with adjustable flow rate, the flow-stopping member includes a flow-stopping part movably extending into the sub-runner, and the diameter of the flow-stopping part is adapted to the width of the sub-runner. When the flow-stopping part moves in a direction perpendicular to the sub-runner, the opening degree in the height direction of the sub-runner can be adjusted.

[0008] In the above injection mold with adjustable flow rate, a first accommodating groove for the flow-stopping part to extend into is provided on each sub-runner, and a second accommodating groove for accommodating the flow-stopping member is provided in the template, and the second accommodating groove corresponds to and communicates with the first accommodating groove one by one.

[0009] In the above injection mold with adjustable flow rate, the second accommodating groove has a limiting part. When the flow-stopping part moves into the limiting part and disengages from the first accommodating groove, the flow-stopping part is clamped with the limiting part.

[0010] In the above-mentioned injection mold with adjustable flow rate, a diversion pouring hole is further provided at one end of each of the sub-runners away from the main runner, and the flow stopper is located between the diversion pouring hole and the inlet of the sub-runner.

[0011] In the above-mentioned injection mold with adjustable flow rate, the sub-runners are arranged on both sides of the main runner, are perpendicular to the main runner respectively, and there is a gap between each of the sub-runners.

[0012] In the above-mentioned injection mold with adjustable flow rate, the template includes a lower plate and a stripper plate which are movably connected. The runner is arranged on one surface of the lower plate facing the stripper plate, and a blocking plate is arranged on one surface of the stripper plate facing the runner. The blocking plate completely covers the runner and abuts against the lower plate.

[0013] In the above-mentioned injection mold with adjustable flow rate, the length of the blocking plate is greater than the length of the main runner. The blocking plate extends along its own axis to both sides and forms a plurality of extension blocks, and the extension blocks correspond to the sub-runners one by one.

[0014] In the above-mentioned injection mold with adjustable flow rate, a main pouring hole communicating with the main runner is provided on the blocking plate, and the main pouring hole is coaxial with the center point of the main runner.

[0015] In the above-mentioned injection mold with adjustable flow rate, the blocking plate is detachably connected to the stripper plate.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: By respectively arranging a movably flow stopper on each sub-runner, when the flow stopper moves along the direction perpendicular to the sub-runner, the opening degree of the sub-runner can be adjusted. Furthermore, the flow rate and velocity of the plastic melt entering the molding cavity through each sub-runner are accurately controlled, avoiding the problem of inconsistent filling speeds at different parts of the product and causing product quality problems, effectively improving the consistency and quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded view of the injection mold according to the embodiment of the present utility model.

[0018] Figure 2 It is a sectional view of the injection mold according to the embodiment of the present utility model.

[0019] Figure 3 It is a schematic structural view of the lower plate according to the embodiment of the present utility model.

[0020] Figure 4 It is a schematic structural view of the stripper plate according to the embodiment of the present utility model.

[0021] In all the drawings, the same reference numerals denote the same technical features, specifically: 100, the template; 110, the upper plate; 120, the lower plate; 121, the second accommodation groove; 122, the limiting portion; 130, the stripper plate; 200, the runner; 210, the main runner; 220, the sub-runners; 221, the first accommodation groove; 222, the sub-gating holes; 300, the flow stopper; 310, the flow-stopping portion; 400, the sealing plate; 410, the extension block; 420, the main gating hole. Detailed implementation manners

[0022] The following are specific embodiments of the present utility model and, in conjunction with the drawings, further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0023] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] As Figures 1 to 4 shown, an injection mold with adjustable flow rate includes a template 100, a runner 200, a flow stopper 300, and a sealing plate 400.

[0025] As Figures 1 to 4 shown, an injection mold with adjustable flow rate includes:

[0026] A template 100, on which a runner 200 is provided, and the runner 200 includes a main runner 210 and a plurality of sub-runners 220 communicating with the main runner 210;

[0027] An adjusting structure, which includes a plurality of flow stoppers 300 movably arranged on the sub-runners 220. When the flow stoppers 300 move along the direction perpendicular to the sub-runners 220, the opening degree of the sub-runners 220 can be adjusted. Furthermore, the flow rate and velocity of the plastic melt entering the molding cavity through each sub-runner 220 can be accurately controlled, avoiding the problem of inconsistent filling speeds at different parts of the product and causing product quality problems, effectively improving the consistency and quality of the product.

[0028] As Figures 1 to 4 shown, in this embodiment, the template 100 is a fixed template 100, which includes an upper plate 110, a lower plate 120, and a stripper plate 130 movably arranged between the upper plate 110 and the lower plate 120. The upper plate 110, the lower plate 120, and the stripper plate 130 are all rectangular. Among them, the lower plate 120 is used to cooperate with the moving template 100 to form the molding cavity of the product, and the stripper plate 130 is used to realize the convenient demolding of the product.

[0029] In this embodiment, the runner 200 is disposed on one surface of the lower plate 120 facing the stripper plate 130. It includes a main runner 210 and a plurality of sub-runners 220 communicating with the main runner 210 to meet the injection molding requirements for different positions of the product. Preferably, in this embodiment, the main runner 210 is disposed at the central position of the lower plate 120, and its two ends extend along the length direction of the lower plate 120. The plurality of sub-runners 220 are disposed on both sides of the main runner 210 and are perpendicular to the main runner 210 respectively, and there is a gap between each sub-runner 220 to meet the requirements of multi-point injection molding of the product.

[0030] Preferably, in this embodiment, there are four groups of sub-runners 220, which are arranged in a staggered manner on both sides of the main runner 210.

[0031] In this embodiment, a first accommodation groove 221 for the flow-stop portion 310 to extend into is provided on each sub-runner 220. A second accommodation groove 121 for accommodating the flow-stop member 300 is provided on the lower plate 120, and the second accommodation groove 121 corresponds to and communicates with the first accommodation groove 221 one by one, so that the flow-stop member 300 can move up and down along the direction perpendicular to the length direction of the sub-runner 220, thereby realizing the control of the flow rate of the runner 200.

[0032] Preferably, in this embodiment, the first accommodation groove 221 is a round hole, and the second accommodation groove 121 is a cylindrical shape with a boss.

[0033] In this embodiment, the second accommodation groove 121 has a limit 122. When the flow-stop portion 310 moves into the limit 122 and disengages from the first accommodation groove 221, the flow-stop portion 310 is clamped with the limit 122 to prevent the flow-stop member 300 from over-traveling.

[0034] Preferably, when the flow-stop portion 310 is clamped with the limit 122, the gap between the first accommodation groove 221 and the second accommodation groove 121 is filled by the flow-stop portion 310, thereby preventing the plastic melt from flowing into the second accommodation groove 121.

[0035] In this embodiment, a sub-injection hole 222 is further provided at one end of each sub-runner 220 away from the main runner 210 to inject the plastic melt into the molding cavity. The flow-stop member 300 is disposed between the sub-injection hole 222 and the inlet of the sub-runner 220. Compared with directly setting at the inlet of the sub-runner 220, this design provides a higher degree of control freedom and will not affect the structure of the sub-injection hole 222.

[0036] To ensure that the flow rate and velocity of the plastic melt entering the molding cavity from each runner 220 are consistent, in this embodiment, an adjustment structure is provided. The adjustment structure includes a plurality of flow-stop members 300 movably disposed on the runner 220. When the flow-stop member 300 moves in a direction perpendicular to the runner 220, the opening degree of each runner 220 can be adjusted. By finely adjusting the opening degree of each runner 220, regardless of the distance from the main runner 210, plastic melt can be injected into the molding cavity synchronously and quantitatively, effectively reducing internal stress concentration and shrinkage deformation of the product caused by inconsistent flow velocity and flow rate, and significantly improving the finished product rate.

[0037] It should be noted that the flow-stop member 300 can also be used to meet different flow velocity and flow rate requirements of each runner 220.

[0038] In this embodiment, the flow-stop member 300 is vertically arranged in the runner 220 and includes a flow-stop portion 310 movably extending into the runner 220. The diameter of the flow-stop portion 310 is adapted to the width of the runner 220, so that the plastic melt can only flow above the flow-stop portion 310 when in the runner 220. Thus, when the flow-stop portion 310 moves in a direction perpendicular to the runner 220, the opening degree in the height direction of the runner 220 can be adjusted to control the flow velocity and flow rate of each runner 220.

[0039] Preferably, in this embodiment, the flow-stop member 300 is threadedly connected to the second receiving groove 121, effectively ensuring the stability of the flow-stop member 300 after adjustment.

[0040] Considering the gap between the stripper plate 130 and the lower plate 120, in order to avoid overflow during the operation of the injection mold, in this embodiment, a sealing plate 400 is provided on the surface of the stripper plate 130 facing the runner 200. The sealing plate 400 completely covers the runner 200 and abuts against the lower plate 120. This forms a sealed space between the runner 200 and the stripper plate 130, effectively preventing the plastic melt from overflowing during the pouring process and avoiding waste of materials.

[0041] In this embodiment, the length of the sealing plate 400 is greater than the length of the main runner 210, and the sealing plate 400 extends along its own axis to both sides and is formed with a plurality of extension blocks 410 perpendicular to its own axis. The extension blocks 410 correspond to the runners 220 one by one. Through the design of the extension blocks 410, while ensuring full coverage of the runner, the material of the sealing plate 400 is effectively saved, and the production cost of the injection mold is reduced.

[0042] In this embodiment, a main pouring hole 420 communicating with the main runner 210 is provided on the plugging plate 400, and the center point of the main pouring hole 420 is coaxial with that of the main runner 210. This ensures that the plastic melt can accurately and smoothly enter the center of the main runner 210, avoiding the hydrodynamic imbalance that may be caused by eccentric pouring, and improving the stability and predictability of the pouring process.

[0043] In this embodiment, the plugging plate 400 is detachably connected to the stripper plate 130. Preferably, the two are threadedly connected by screws. This not only simplifies the maintenance process of the mold, but also reduces the maintenance cost, and improves the service life and production efficiency of the mold.

[0044] It should be noted that in this utility model, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. Terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0045] In addition, the technical solutions between various embodiments of this utility model can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by this utility model.

[0046] The specific embodiments described herein are only illustrative of the spirit of this utility model. Those skilled in the art of this utility model can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of this utility model or exceed the scope defined by the appended claims.

Claims

1. An injection mold with adjustable flow rate, characterized in that: include: A template, wherein a runner is provided on the template, and the runner includes a main runner and a plurality of branch runners connected to the main runner; The regulating structure includes a plurality of flow-stopping members movably arranged on the branch channel. When the flow-stopping members move in a direction perpendicular to the branch channel, the size of the opening of the branch channel can be adjusted.

2. The injection mold with adjustable flow rate according to claim 1, characterized in that: The flow stop member includes a flow stop portion that can be movably extended into the branch channel. The diameter of the flow stop portion is adapted to the width of the branch channel. When the flow stop portion moves in a direction perpendicular to the branch channel, the opening size of the branch channel in the height direction can be adjusted.

3. The injection mold with adjustable flow rate according to claim 2, characterized in that: Each of the branch channels is provided with a first receiving groove for the flow stopper to extend into, and the template is provided with a second receiving groove for receiving the flow stopper, and the second receiving groove corresponds to and is communicated with the first receiving groove one by one.

4. The injection mold with adjustable flow rate according to claim 3, characterized in that: The second accommodating groove has a limiting portion. When the flow-stopping portion moves into the limiting portion and escapes from the first accommodating groove, the flow-stopping portion is engaged with the limiting portion.

5. The injection mold with adjustable flow rate according to claim 2, characterized in that: Each of the branch channels is further provided with a branch pouring hole at one end away from the main channel, and the flow stopper is located between the branch pouring hole and the inlet of the branch channel.

6. The injection mold with adjustable flow rate according to claim 1, characterized in that: The branch flow channels are arranged on both sides of the main flow channel and are respectively perpendicular to the main flow channel, and there is a gap between each of the branch flow channels.

7. The injection mold with adjustable flow rate according to claim 6, characterized in that: The template includes a movably connected lower plate and a stripper plate, the runner is arranged on a side of the lower plate facing the stripper plate, and a sealing plate is provided on a side of the stripper plate facing the runner, the sealing plate fully covers the runner and abuts against the lower plate.

8. The injection mold with adjustable flow rate according to claim 7, characterized in that: The length of the blocking plate is greater than the length of the main flow channel. The blocking plate extends to both sides along its own axis and forms a plurality of extension blocks, and the extension blocks correspond to the branch flow channels one by one.

9. The injection mold with adjustable flow rate according to claim 7, characterized in that: The blocking plate is provided with a main pouring hole connected with the main flow channel, and the main pouring hole is coaxial with the center point of the main flow channel.

10. The injection mold with adjustable flow rate according to claim 7, characterized in that: The blocking plate is detachably connected to the stripping plate.

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