Runner structure and mold

Abstract

The utility model provides a runner structure and a mold, the runner structure is communicated with a cavity, and the cavity comprises a surface. The flow channel structure comprises an ox horn flow channel and a guide flow channel. The ox horn runner comprises a small-diameter end. The guide flow channel comprises an inlet and an outlet, the inlet of the guide flow channel and the outlet of the guide flow channel face different directions, the cross sectional area of the guide flow channel is gradually increased from the inlet of the guide flow channel to the outlet of the guide flow channel, and the cross sectional area of the inlet of the guide flow channel is smaller than that of the outlet of the guide flow channel; an outlet of the guide runner penetrates through the surface of the cavity, and the small-diameter end of the ox horn runner communicates with an inlet of the guide runner. According to the invention, the problem that gas marks or marks are easily generated on the surface of a product formed by the cavity by gas in the cavity in the existing ox horn glue feeding mode is solved.

Description

Technical Field

[0001] The present application relates to the technical field of molds, and in particular to a flow channel structure and a mold. Background Art

[0002] For plastic products with high requirements for surface appearance (such as thin plastic products), in order to avoid secondary processing of the glue mouth after molding, the method of gluing with bull horns is generally used (that is, the molten plastic is allowed to enter the mold cavity through a bull horn runner to form a product). When the conventional bull horn gluing method is used to fill the molten plastic, the molten plastic flows from the large diameter end of the bull horn runner to the small diameter end of the bull horn runner, that is, the cross-sectional area of ​​the bull horn runner becomes smaller and smaller, and the flow rate of the molten plastic becomes larger and larger. Therefore, when the molten plastic is ejected from the small diameter end of the bull horn runner, the gas in the mold cavity impacts the surface of the product formed by the mold cavity, and it is easy to produce air marks or flow marks on the product surface due to the excessive flow rate of the molten plastic. Therefore, the existing bull horn gluing method has the problem that the gas in the mold cavity easily impacts the surface of the product and produces air marks or marks on the product surface. Utility Model Content

[0003] The purpose of the present application is to provide a flow channel structure in which the gas in the cavity is not easy to impact the surface of the product and produce gas marks or traces on the surface of the product, the flow channel structure is connected to the cavity, the cavity includes a surface, and the flow channel structure includes a bullhorn flow channel and a guide flow channel. The bullhorn flow channel includes a small diameter end. The guide flow channel includes an inlet and an outlet, the inlet of the guide flow channel and the outlet of the guide flow channel face different directions, the cross-sectional area of ​​the guide flow channel gradually increases from the inlet of the guide flow channel to the outlet of the guide flow channel, the cross-sectional area of ​​the inlet of the guide flow channel is smaller than the cross-sectional area of ​​the outlet of the guide flow channel, the outlet of the guide flow channel is arranged through the surface of the cavity, and the small diameter end of the bullhorn flow channel is connected to the inlet of the guide flow channel.

[0004] Optionally, an angle between a central axis of the inlet of the guide flow channel and a central axis of the outlet of the guide flow channel is an obtuse angle.

[0005] Optionally, the guide channel includes a first guide surface, the first guide surface extends to the cavity, and the inlet of the guide channel passes through the first guide surface.

[0006] Optionally, the first guide surface is arranged to be inclined outwardly relative to the surface of the cavity.

[0007] Optionally, the small diameter end of the bull horn flow channel is arranged perpendicular to the first guide surface.

[0008] Optionally, the inlet of the guide channel is arranged at a middle position of the first guide surface.

[0009] Optionally, a diameter of the inlet of the guide channel is smaller than a width of the first guide surface.

[0010] Optionally, the guide channel further includes a second guide surface, and the second guide surface extends to the cavity.

[0011] Optionally, the second guide surface is arranged perpendicular to the surface of the cavity.

[0012] Optionally, the second guide surface intersects with the first guide surface, the angle between the second guide surface and the first guide surface is an acute angle, the inlet of the guide channel is set close to the angle between the second guide surface and the first guide surface, and the outlet of the guide channel is set away from the angle between the second guide surface and the first guide surface.

[0013] Optionally, the guide channel also includes a first plane and a second plane, the first plane and the second plane extend to the cavity, the first plane, the first guide surface, the second guide surface and the second plane form a triangular prism with an open end, and the outlet of the guide channel is arranged at the open end.

[0014] Optionally, the first plane and the second plane are arranged parallel to each other.

[0015] Optionally, the cavity is in a rectangular parallelepiped shape, and the surface of the cavity is a plane.

[0016] The present application also provides a mold, which includes the flow channel structure.

[0017] The beneficial effect of the present application is that: by setting the bullhorn flow channel and the guide flow channel. The bullhorn flow channel includes a small diameter end. The guide flow channel includes an inlet and an outlet, the inlet of the guide flow channel and the outlet of the guide flow channel face different directions, the cross-sectional area of ​​the guide flow channel gradually increases from the inlet of the guide flow channel to the outlet of the guide flow channel, the cross-sectional area of ​​the inlet of the guide flow channel is smaller than the cross-sectional area of ​​the outlet of the guide flow channel, the outlet of the guide flow channel penetrates the surface of the cavity, and the small diameter end of the bullhorn flow channel is connected to the inlet of the guide flow channel.

[0018] Since the cross-sectional area of ​​the guide flow channel gradually increases from the inlet of the guide flow channel to the outlet of the guide flow channel, the cross-sectional area of ​​the inlet of the guide flow channel is smaller than the cross-sectional area of ​​the outlet of the guide flow channel, and the outlet of the guide flow channel is arranged through the surface of the cavity, the closer the molten plastic in the guide flow channel is to the outlet of the guide flow channel, the lower its flow rate. Therefore, if the flow rate of the molten plastic flowing out of the outlet of the guide flow channel is reduced, the impact of the gas in the cavity on the molten plastic forming the product will also be reduced, and then the gas in the cavity is not easy to produce gas marks or traces on the surface of the product formed in the cavity due to the impact on the product.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the present application is described in detail below with reference to the preferred embodiments of the present application and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional cross-sectional view and a partial enlarged view of the mold in one embodiment of the present application (only half of the flow channel structure and half of the mold are shown, the other half of the flow channel structure not shown and the part of the flow channel structure already shown are symmetrical about the plane where the shadow surface is located, and the other half of the mold not shown and the part of the mold already shown are symmetrical about the plane where the shadow surface is located);

[0021] Figure 2 is a front view of a flow channel structure in one embodiment of the present application;

[0022] Figure 3 It is a three-dimensional diagram of the flow channel structure in one embodiment of the present application.

[0023] Wherein, the reference numerals are:

[0024] 1 cavity

[0025] 10 Surface

[0026] 2 Horn runner

[0027] 20 Trail end

[0028] 21 large diameter end

[0029] 3 Guide channel

[0030] 30 entrances

[0031] Exit 31

[0032] 32 first guide surface

[0033] 33 second guide surface

[0034] 34 First Plane

[0035] 35 Second Plane

[0036] 4 Mould

[0037] aThe angle between the second guide surface and the first guide surface DETAILED DESCRIPTION

[0038] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0039] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments. In order to enable those skilled in the art to better understand the present application scheme, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present application.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] like Figure 1As shown, in one embodiment, a flow channel structure is provided, which is connected to the cavity 1, and the cavity 1 includes a surface 10. The flow channel structure includes: a bullhorn flow channel 2 and a guide flow channel 3. The bullhorn flow channel 2 includes a small diameter end 20. The guide flow channel 3 includes an inlet 30 and an outlet 31, and the inlet 30 of the guide flow channel 3 and the outlet 31 of the guide flow channel 3 face different directions. The cross-sectional area of ​​the guide flow channel 3 gradually increases from the inlet 30 of the guide flow channel 3 to the outlet 31 of the guide flow channel 3. The cross-sectional area of ​​the inlet 30 of the guide flow channel 3 is smaller than the cross-sectional area of ​​the outlet 31 of the guide flow channel 3. The outlet 31 of the guide flow channel 3 is arranged through the surface 10 of the cavity 1, and the small diameter end 20 of the bullhorn flow channel 2 is connected to the inlet 30 of the guide flow channel 3.

[0043] like Figure 1 As shown, for the convenience of explanation, a rectangular coordinate system O-xyz is established in each figure. The X-axis of the rectangular coordinate system is set along the length direction of the cavity 1. The Y-axis of the rectangular coordinate system is set along the width direction of the cavity 1. The cavity 1 can be in the shape of a rectangular thin sheet. The cavity 1 is a part that constitutes the product space. The horn flow channel 2 is a flow channel shaped like a horn, and its cross section can be circular. The direction of the horn flow channel 2 can be an arc line. The left end of the horn flow channel 2 can be connected to the right side of the guide flow channel 3. The horn flow channel 2 includes a large diameter end 21, which is the end of the horn flow channel 2 with a larger cross-sectional diameter. The horn flow channel 2 also includes a small diameter end 20, which is the end of the horn flow channel 2 with a smaller cross-sectional diameter. The horn flow channel 2 and the guide flow channel 3 are arranged in the mold 4. The large diameter end 21 of the horn flow channel 2 can be connected to the main flow channel of the mold 4. The diameter of the small diameter end 20 of the bullhorn runner 2 is substantially the same as the diameter of the inlet 30 of the guide runner 3. The molten plastic flows to the mold cavity 1 through the bullhorn runner 2 and the guide runner 3 and forms a product in the mold cavity 1.

[0044] like Figure 1 As shown, the top of the guide channel 3 can be connected to the bottom of the cavity 1. The specific structure of the guide channel 3 can refer to the subsequent content of the embodiment. The cross section of the guide channel 3 can be parallel to the XoY plane. The surface 10 of the cavity 1 can be a plane and parallel to the XoY plane. For example, the surface 10 of the cavity 1 can be the inner lower surface of the rectangular thin sheet cavity 1. The inlet 30 of the guide channel 3 is the opening on the guide channel 3 for receiving the molten plastic from the bullhorn flow channel 2 into the guide channel 3. The outlet 31 of the guide channel 3 is the opening on the guide channel 3 for discharging the molten plastic in the guide channel 3. The cross section of the inlet 30 of the guide channel 3 can be circular.

[0045] like Figure 1As shown, the cross-section of the outlet 31 of the guide channel 3 can be rectangular. The inlet 30 of the guide channel 3 can be arranged on the right side of the guide channel 3. The central axis of the inlet 30 of the guide channel 3 can form an acute angle with the positive direction of the X-axis. The outlet 31 of the guide channel 3 can be arranged at the top of the guide channel 3. The central axis of the outlet 31 of the guide channel 3 can be parallel to the Z-axis. The inlet 30 of the guide channel 3 and the outlet 31 of the guide channel 3 may face different directions, and there may be an angle between the central axis of the inlet 30 of the guide channel 3 and the central axis of the outlet 31 of the guide channel 3 that is greater than 0° and less than 180°.

[0046] like Figure 1 As shown, since the cross-sectional area of ​​the guide flow channel 3 gradually increases from the inlet 30 of the guide flow channel 3 to the outlet 31 of the guide flow channel 3, the cross-sectional area of ​​the inlet 30 of the guide flow channel 3 is smaller than the cross-sectional area of ​​the outlet 31 of the guide flow channel 3, and the outlet 31 of the guide flow channel 3 is set through the surface 10 of the cavity 1, the closer the molten plastic in the guide flow channel 3 is to the outlet 31 of the guide flow channel 3, the lower its flow rate (because the flow rate of the molten plastic passing through the guide flow channel 3 is fixed, according to the flow formula: flow rate = flow rate × cross-sectional area of ​​the guide flow channel 3, so the larger the cross-sectional area of ​​the guide flow channel 3, the lower the flow rate). Therefore, the flow rate of the molten plastic flowing out of the outlet 31 of the guide flow channel 3 is reduced, and the impact of the gas in the cavity 1 on the molten plastic forming the product will also be reduced, and then the gas in the cavity 1 is not easy to produce gas marks or traces on the surface of the product formed in the cavity 1 due to the impact on the product. The gas in the cavity 1 can be extracted by the exhaust system connected to the cavity 1.

[0047] like Figure 1 As shown, since the inlet 30 and the outlet 31 of the guide flow channel 3 face different directions, after the molten plastic enters the guide flow channel 3 from the inlet 30 provided at the guide flow channel 3, it will first collide with the inner wall of the guide flow channel 3 to decelerate, that is, after the molten plastic collides with the inner wall of the guide flow channel 3 and changes its flow direction, it will lose a part of its flow velocity, which further reduces the flow velocity of the molten plastic from the outlet 31 of the guide flow channel 3. Specifically, after the molten plastic enters the guide flow channel 3 from the inlet 30 provided at the guide flow channel 3, it will collide with the first guide surface 32 and the second guide surface 33 to change its flow direction.

[0048] like Figure 1 As shown, optionally, the angle between the central axis of the inlet 30 of the guide channel 3 and the central axis of the outlet 31 of the guide channel 3 is an obtuse angle. The central axis of the inlet 30 of the guide channel 3 can be perpendicular to the first guide surface 32 and pass through the center of the inlet 30, and the central axis of the outlet 31 of the guide channel 3 can be parallel to the Z axis and pass through the center point of the outlet 31.

[0049] like Figure 1As shown, optionally, the guide channel 3 includes a first guide surface 32, the first guide surface 32 extends to the mold cavity 1, and the inlet 30 of the guide channel 3 passes through the first guide surface 32. The first guide surface 32 can be a rectangular plane. The first guide surface 32 can be the right side surface of the guide channel 3. The top of the first guide surface 32 can extend to the bottom of the mold cavity 1.

[0050] like Figure 1 As shown, optionally, the first guide surface 32 is arranged outwardly inclined to the surface 10 of the cavity 1. For example, the first guide surface 32 can be inclined in the positive direction of the X-axis (that is, the angle between the first guide surface 32 and the positive direction of the X-axis is an obtuse angle). The first guide surface 32 is arranged outwardly inclined to the surface 10 of the cavity 1, so that it can form a guide channel 3 with other inner surfaces of the guide channel 3, whose cross-sectional area gradually increases from the inlet 30 of the guide channel 3 to the outlet 31 of the guide channel 3. The first guide surface 32 is arranged outwardly inclined to the surface 10 of the cavity 1, which can also allow the molten plastic to enter the cavity 1 along the first guide surface 32, thereby preventing the molten plastic from directly impacting the cavity 1 along the normal direction of the cavity 1 (for example, the normal direction of the cavity 1 can be set parallel to the Z axis) and causing the air in the cavity 1 to produce air marks on the product.

[0051] like Figure 1 As shown, optionally, the small diameter end 20 of the horn flow channel 2 is arranged perpendicular to the first guide surface 32. The small diameter end 20 of the horn flow channel 2 is arranged perpendicular to the first guide surface 32 so that the central axis of the end face of the small diameter end 20 of the horn flow channel 2 and the central axis of the inlet 30 of the guide flow channel 3 are coaxial.

[0052] like Figure 2 As shown, optionally, the inlet 30 of the guide channel 3 is arranged at the middle position of the first guide surface 32. The center of the inlet 30 of the guide channel 3 may coincide with the center point of the first guide surface 32. The diameter of the inlet 30 of the guide channel 3 is smaller than the width of the first guide surface 32.

[0053] like Figure 2 As shown, optionally, the guide channel 3 also includes a second guide surface 33, and the second guide surface 33 extends to the mold cavity 1. The second guide surface 33 can face the first guide surface 32 and intersect with the first guide surface 32. The second guide surface 33 can be a rectangular plane. The second guide surface 33 can be the left side of the guide channel 3. The top of the second guide surface 33 can extend to the bottom of the mold cavity 1.

[0054] like Figure 2As shown, optionally, the second guide surface 33 is arranged perpendicular to the surface 10 of the cavity 1. The second guide surface 33 may be parallel to the YoZ plane. The second guide surface 33 is arranged perpendicular to the surface 10 of the cavity 1 to avoid the area of ​​the outlet 31 of the guide channel 3 being too large, thereby preventing the flow rate of the molten plastic at the outlet 31 from being too low (for example, if the second guide surface 33 is inclined in the negative direction of the X-axis, the cross-sectional area of ​​the outlet 31 of the guide channel 3 will be further increased).

[0055] like Figure 2 As shown, optionally, the second guide surface 33 and the first guide surface 32 intersect, the angle a between the second guide surface 33 and the first guide surface 32 is an acute angle, the inlet 30 of the guide channel 3 is arranged close to the angle a between the second guide surface 33 and the first guide surface 32, and the outlet 31 of the guide channel 3 is arranged away from the angle a between the second guide surface 33 and the first guide surface 32. The angle a between the second guide surface 33 and the first guide surface 32 is an acute angle, and the inlet 30 of the guide channel 3 is arranged close to the angle a between the second guide surface 33 and the first guide surface 32, and the outlet 31 of the guide channel 3 is arranged away from the angle a between the second guide surface 33 and the first guide surface 32, so that the second guide surface 33, the first guide surface 32 and other inner surfaces of the guide channel 3 can form a guide channel 3 whose cross-sectional area gradually increases from the inlet 30 of the guide channel 3 to the outlet 31 of the guide channel 3.

[0056] like Figure 3 As shown, optionally, the guide channel 3 also includes a first plane 34 (the first plane 34 is shown in FIG. Figure 1 , the same below) and the second plane 35, the first plane 34 and the second plane 35 extend to the cavity 1, the first plane 34, the first guide surface 32 (the first guide surface 32 please refer to Figure 1 , the same below), the second guide surface 33 and the second plane 35 enclose a triangular prism with an open end, and the outlet 31 of the guide channel 3 is set at the open end. For example, the bottom end of the triangular prism can be an open end. The first plane 34 and the second plane 35 can be a triangle. The first plane 34 and the second plane 35 can be the front side and the rear side of the guide channel 3, respectively. The bottom end of the first plane 34 and the bottom end of the second plane 35 can extend to the cavity 1, respectively. The first plane 34, the first guide surface 32, the second guide surface 33 and the second plane 35 enclose a triangular prism with an open end, that is, the cross-section of the guide channel 3 is rectangular, and the cross-sectional area of ​​the guide channel 3 gradually increases from the top of the triangular prism-shaped guide channel 3 to the bottom of the triangular prism-shaped guide channel 3. For example, the cross-sectional area of ​​the guide channel 3 can gradually increase from the top of the triangular prism-shaped guide channel 3 along the positive direction of the Z axis.

[0057] like Figure 3 As shown, optionally, the first plane 34 (the first plane 34 is referred to Figure 1, the same below) and the second plane 35 are arranged parallel to each other. The first plane 34 and the second plane 35 may be perpendicular to the surface 10 of the cavity 1. The first plane 34 and the second plane 35 may be parallel to the XoZ plane.

[0058] like Figure 3 As shown, optionally, the mold cavity 1 is in a rectangular parallelepiped shape, and the surface 10 of the mold cavity 1 is a plane. For example, the surface 10 of the mold cavity 1 can be the lower inner surface of the rectangular parallelepiped mold cavity 1.

[0059] like Figure 1 As shown, in another embodiment, a mold 4 is provided, which includes the flow channel structure in the above-mentioned embodiment.

[0060] The flow channel structure and mold provided in the embodiments of the present application are introduced in detail above. For those skilled in the art, according to the ideas of the embodiments of the present application, there will be some changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application. All equivalent modifications or changes made according to the spirit and technical ideas of the present application should still be covered by the claims of the present application.

Claims

1. A flow channel structure, which is connected to a cavity, wherein the cavity includes a surface, characterized in that: include: a bullhorn flow channel including a small diameter end; as well as A guide channel, comprising an inlet and an outlet, wherein the inlet of the guide channel and the outlet of the guide channel face different directions, the cross-sectional area of ​​the guide channel gradually increases from the inlet of the guide channel to the outlet of the guide channel, the cross-sectional area of ​​the inlet of the guide channel is smaller than the cross-sectional area of ​​the outlet of the guide channel, the outlet of the guide channel is arranged to penetrate the surface of the cavity, and the small-diameter end of the bull-horn channel is connected to the inlet of the guide channel.

2. The flow channel structure according to claim 1, characterized in that: An angle between a central axis of the inlet of the guide flow channel and a central axis of the outlet of the guide flow channel is an obtuse angle.

3. The flow channel structure according to claim 1, characterized in that: The guide channel includes a first guide surface, the first guide surface extends to the cavity, and the inlet of the guide channel passes through the first guide surface.

4. The flow channel structure according to claim 3, characterized in that: The first guide surface is arranged to be inclined outwardly to the surface of the cavity.

5. The flow channel structure according to claim 3, characterized in that: The small diameter end of the bullhorn flow channel is arranged perpendicular to the first guide surface.

6. The flow channel structure according to claim 3, characterized in that: The inlet of the guide flow channel is arranged at a middle position of the first guide surface.

7. The flow channel structure according to claim 3, characterized in that: A diameter of the inlet of the guide flow channel is smaller than a width of the first guide surface.

8. The flow channel structure according to claim 3, characterized in that: The guide channel further includes a second guide surface, and the second guide surface extends to the mold cavity.

9. The flow channel structure according to claim 8, characterized in that: The second guide surface is arranged perpendicular to the surface of the cavity.

10. The flow channel structure according to claim 8, characterized in that: The second guide surface intersects with the first guide surface, and the angle between the second guide surface and the first guide surface is an acute angle. The inlet of the guide channel is arranged close to the angle between the second guide surface and the first guide surface, and the outlet of the guide channel is arranged away from the angle between the second guide surface and the first guide surface.

11. The flow channel structure according to claim 8, characterized in that: The guide channel also includes a first plane and a second plane, the first plane and the second plane extend to the cavity, the first plane, the first guide surface, the second guide surface and the second plane enclose a triangular prism with an open end, and the outlet of the guide channel is arranged at the open end.

12. The flow channel structure according to claim 11, characterized in that: The first plane and the second plane are arranged parallel to each other.

13. The flow channel structure according to claim 1, characterized in that: The mold cavity is in a rectangular parallelepiped shape, and the surface of the mold cavity is a plane.

14. A mold, characterized in that: Comprising the flow channel structure according to any one of claims 1-13.

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