A reverse flow channel structure for preventing surface air marks at a gate

Abstract

The utility model relates to a kind of turnover type runner structure for preventing surface air mark at gate, including product cavity, runner structure, slider and straight top block, the lower side of the edge of the product cavity is equipped with straight top block, the slider one end and straight top block one side are top, the slider lower side is equipped with runner structure, the straight top block and the one end of slider butt joint is equipped with the arc-shaped recess structure of inner recess, the runner structure is extended upwards along arc-shaped recess structure and the lower end edge of product cavity butt joint, and forms runner inlet, the outside of the product cavity is equipped with the inclined side wall structure of lower end inclined to outside, the runner inlet is inclined to the direction of inclined side wall structure direction.This utility model has the characteristics of low modification cost, avoiding surface problem, improving product quality and the like.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a flip-type runner structure for preventing air marks on the surface of the gate. Background Technology

[0002] In injection molds, about 80% of traditional gates use sliding gates. Sliding gates can place the gate in a more concealed location, without affecting the product's appearance. The gate cross-sectional area is relatively large, resulting in relatively small pressure loss during injection. Since it is far from the appearance surface, it is less likely to damage the appearance surface when removing the gate. However, this process also has certain drawbacks.

[0003] In a slider gate, the reason why the appearance of the gate surface is not damaged is, for example... Figure 10 As shown, this is because the slider extends into the PL line inside the product, creating a gap of distance d between the PL line and the outer wall of the product cavity. Figure 10 Air marks and other problems are prone to occur between the shaded area and the upper side of the slider. The reason for this is that the plastic injected vertically upwards will collide with the outer wall of the product cavity, and then roll down to contact the slider. When it rolls down, it is easy to trap air. At the same time, the overall volume of the shaded area is large, and the flow performance of the material is not good when filling. As a result, the surface of the product in this area is prone to appearance defects. In order to solve the above problems, a new flow channel structure needs to be designed. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a flip-type runner structure to prevent surface gas marks at the gate, thereby improving the appearance of gas marks at the gate. The flip-type runner structure evenly diffuses shear heat, preventing heat concentration and surface defects. The buffer arc evenly distributes the melt velocity along the radial direction of the gate. Thus, the velocity and temperature changes of the melt from the gate to the cavity are not the drastic changes of the conventional method, but rather a gradual process, thereby reducing surface defects at the gate.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to provide a flip-type runner structure for preventing surface air marks at the gate, including a product cavity, a runner structure, a slider and a straight push block. A straight push block is installed on the lower side of the edge of the product cavity. One end of the slider and one side of the straight push block are abutted. A runner structure is provided on the lower side of the slider. A concave arc-shaped groove structure is provided on the end of the straight push block that connects with the slider. The runner structure extends upward along the arc-shaped groove structure and connects with the lower edge of the product cavity to form a runner inlet. An inclined sidewall structure with the lower end inclined outward is provided on the outside of the product cavity. The runner inlet is inclined towards the inclined sidewall structure.

[0006] In this technical solution, an arc-shaped groove structure is used to flip the flow channel entering the product cavity. The flow channel changes from the middle of the slider from the bottom to the top, and a fluid flip is performed, which makes the injection pressure, temperature and speed of the plastic solution uniform. At the same time, the flow channel inlet adopts an inclined structure, which enhances the material flow performance at the contact position with the slider, avoids external surface defects such as air marks and spots, and improves product quality.

[0007] As a supplement to this technical solution, an angle is formed between the flow channel inlet and the inclined sidewall structure, with the angle ranging from 75° to 105°. By setting an angle slightly closer to 90°, this part will not be entrained with too much air, while also improving the material flowability of this part and improving product quality.

[0008] As a supplement to this technical solution, the flow channel structure includes a vertical straight channel, a longitudinal probing channel, an embedded transverse channel, and an arc-shaped flow channel. The vertical straight channel is located in front of the slider. A longitudinal probing channel is provided at the lower end of the vertical straight channel. An embedded transverse channel is provided on the upper rear end of the longitudinal probing channel and embedded on the lower side of the slider. An arc-shaped flow channel is provided on the left end of the embedded transverse channel and embedded on the slider.

[0009] As a supplement to this technical solution, the vertical direct flow channel is fitted to the front side of the slider, and the longitudinal probing flow channel is fitted to the lower side of the slider.

[0010] As a supplement to this technical solution, a vertically installed push rod structure is installed inside the lower end of the straight push block.

[0011] Beneficial effects: This utility model relates to a flip-type flow channel structure for preventing surface air marks at the gate. By setting an arc-shaped groove structure to flip the flow channel entering the product cavity, the flow channel changes from the bottom to the top of the slider, performing a fluid flip, which makes the injection pressure, temperature, and speed of the plastic solution uniform. At the same time, the flow channel inlet adopts an inclined structure, which enhances the material flow performance at the contact point with the slider, avoiding external surface defects such as air marks and spots, and improving product quality. It has the characteristics of low modification cost, avoiding surface defects, and improving product quality. Attached Figure Description

[0012] Figure 1 This is a top view of the present invention;

[0013] Figure 2 This is the front view of this utility model;

[0014] Figure 3 This is a utility model Figure 1 Sectional view along the AA direction;

[0015] Figure 4 This is a utility model Figure 3 Enlarged view of a portion of point A in the middle;

[0016] Figure 5 This is a structural view of the flow channel structure described in this utility model;

[0017] Figure 6 This is a top view of the utility model before its improvement;

[0018] Figure 7 This is a structural view of the flow channel structure before the improvement of this utility model;

[0019] Figure 8 This is a utility model Figure 6 Sectional view along the BB direction;

[0020] Figure 9 This is a utility model Figure 8 Enlarged view of a section at point B in the middle;

[0021] Figure 10 This is a schematic diagram of the material ejection direction before the improvement of this utility model;

[0022] Figure 11 This is a schematic diagram of the material ejection direction of this utility model.

[0023] Illustration: 1. Product cavity, 2. Slider, 3. Runner structure, 4. Straight ejector block, 5. Ejector rod structure, 6. Arc-shaped groove structure, 7. Inclined sidewall structure, 8. Runner inlet, 9. Vertical straight runner, 10. Longitudinal protruding runner, 11. Embedded transverse runner, 12. Arc-shaped runner, 13. Butt joint surface, 14. Vertical gate, 15. Molding end face. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0025] The embodiments of this utility model relate to a flip-type runner structure for preventing surface air marks at the gate, such as... Figure 1 — Figure 5As shown, the device includes a product cavity 1, a flow channel structure 3, a slider 2, and a straight push block 4. The straight push block 4 is installed on the lower side of the edge of the product cavity 1. One end of the slider 2 abuts against one side of the straight push block 4. The flow channel structure 3 is provided on the lower side of the slider 2. The end of the straight push block 4 that connects with the slider 2 is provided with an inwardly concave arc-shaped groove structure 6. The flow channel structure 3 extends upward along the arc-shaped groove structure 6 and connects with the lower edge of the product cavity 1 to form a flow channel inlet 8. The outside of the product cavity 1 is provided with an inclined sidewall structure 7 with its lower end inclined outward. The flow channel inlet 8 is inclined toward the inclined sidewall structure 7.

[0026] In this technical solution, an arc-shaped groove structure 6 is set to flip the flow channel entering the product cavity 1. The flow channel changes from the bottom to the top of the slider, and a fluid flip is performed, which makes the injection pressure, temperature and speed of the plastic solution uniform. At the same time, the flow channel inlet 8 adopts an inclined structure, which enhances the material flow performance at the contact position with the slider 2, avoids external surface defects such as air marks and spots, and improves product quality.

[0027] As a supplement to this technical solution, an angle is formed between the flow channel inlet 8 and the inclined side wall structure 7, with the angle ranging from 75° to 105°. By setting an angle slightly closer to 90°, this part will not be entrained with too much air, while also improving the material flowability of this part and improving product quality.

[0028] As a supplement to this technical solution, the flow channel structure 3 includes a vertical straight channel 9, a longitudinal probing flow channel 10, an embedded transverse flow channel 11, and an arc-shaped flow channel 12. The vertical straight channel 9 is located in front of the slider 2. The lower end of the vertical straight channel 9 is provided with a longitudinal probing flow channel 10. The upper rear end of the longitudinal probing flow channel 10 is provided with an embedded transverse flow channel 11 that is embedded in the lower side of the slider 2. The left end of the embedded transverse flow channel 11 is provided with an arc-shaped flow channel 12 that is embedded in the slider 2.

[0029] As a supplement to this technical solution, the vertical straight channel 9 is attached to the front side of the slider 2, and the longitudinal probing channel 10 is attached to the lower side of the slider 2.

[0030] As a supplement to this technical solution, a vertically installed push rod structure 5 is installed inside the lower end of the straight push block 4.

[0031] Example

[0032] like Figure 6 — Figure 9 As shown in the attached figure, the above figure describes the original state before the improvement. Before the improvement, the sliding block 2 and the straight ejector block 4 had contacting mating surfaces 13, and a vertical gate 14 extending upwards into the inner edge of the product cavity was provided between them. Figure 10As shown, the vertical gate 14 faces upwards, and the material is vertically injected into the product cavity, then contacts the outer wall 7 of the product cavity, thereby diffusing and filling. At this time, due to... Figure 10 At point C, the overall thickness and height are relatively large. When the material is rolled down, too much air is easily mixed in. At the same time, the leading edge of the material is prone to cooling and solidification. Under the combined effects of poor fluidity and excessive air entrainment, surface defects such as air marks and flow marks are likely to occur at the forming end face 15 that contacts the slider.

[0033] like Figure 11 As shown, in this technical solution, when the material is injected, it is injected at an angle along the inlet 8 of the flow channel. When the leading edge of the material contacts the outer wall 7 of the product cavity, the injection velocity and temperature of the material at the leading edge are much higher than in the original solution. At the same time, the filling space formed between the contact point between the leading edge and the outer wall 7 and the upper surface of the slider 2 is very small, and the amount of mixed gas is also very small. When the material flowability increases, the mixed air is very easy to be discharged, thereby ensuring the quality of the product and avoiding surface defects.

Claims

1. A flip-type runner structure for preventing air marks on the surface of the gate, characterized in that: The product cavity (1) includes a flow channel structure (3), a slider (2) and a straight push block (4). A straight push block (4) is installed on the lower side of the edge of the product cavity (1). One end of the slider (2) is abutted against one side of the straight push block (4). A flow channel structure (3) is provided on the lower side of the slider (2). A concave arc-shaped groove structure (6) is provided on the end of the straight push block (4) and the slider (2). The flow channel structure (3) extends upward along the arc-shaped groove structure (6) and connects with the lower edge of the product cavity (1) to form a flow channel inlet (8). An inclined sidewall structure (7) with its lower end inclined outward is provided on the outside of the product cavity (1). The flow channel inlet (8) is inclined toward the inclined sidewall structure (7).

2. The flip-type runner structure for preventing surface air marks at the gate according to claim 1, characterized in that: An angle is formed between the flow channel inlet (8) and the inclined sidewall structure (7), with the angle ranging from 75° to 105°.

3. The flip-type runner structure for preventing surface air marks at the gate according to claim 1, characterized in that: The flow channel structure (3) includes a vertical straight channel (9), a longitudinal probing channel (10), an embedded transverse flow channel (11), and an arc-shaped flow channel (12). The vertical straight channel (9) is located in front of the slider (2). The lower end of the vertical straight channel (9) is provided with a longitudinal probing channel (10). The upper rear end of the longitudinal probing channel (10) is provided with an embedded transverse flow channel (11) embedded in the lower side of the slider (2). The left end of the embedded transverse flow channel (11) is provided with an arc-shaped flow channel (12) embedded in the slider (2).

4. The flip-type runner structure for preventing surface air marks at the gate according to claim 3, characterized in that: The vertical straight channel (9) and the front side of the slider (2) are attached together, and the longitudinal probing channel (10) and the lower side of the slider (2) are attached together.

5. The flip-type runner structure for preventing surface air marks at the gate according to claim 1, characterized in that: The lower end of the straight top block (4) is fitted with a vertically installed top rod structure (5).

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