A kind of hypoid gear injection mold rotary demolding mechanism and injection mold

Abstract

The utility model discloses a kind of outer helical gear injection mold rotary demolding mechanism and injection mold, wherein outer helical gear injection mold rotary demolding mechanism, characterized by, including movable plate, top plate and multiple drive blocks, drive block is connected with top plate, the upward movement of top plate drives drive block to move towards the direction of separation movable plate, one rotating block is equipped between every two drive blocks, rotating block is rotatably installed on movable plate, and with the oblique tooth forming part for forming helical gear, rotating block and drive block combination form inclined wedge structure, the ejection action of variable drive block is the self-rotating action of rotating block, for spinning out the helical gear of good molding.The utility model provides a kind of outer helical gear injection mold rotary demolding mechanism, by setting rotating block and drive block, without electric drive system, simplify structure and improve stability, multiple drive blocks realize " one out multiple " production, greatly improve production capacity, reduce cost, enhance market competitiveness.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically, to a rotating demolding mechanism for an external helical gear injection mold and an injection mold. Background Technology

[0002] Insert injection molding is a widely used process for manufacturing complex plastic parts. When the plastic part design includes helical external gears, existing mold structures face significant technical challenges. In traditional mold designs, external helical gears require the installation of drive structures such as motors and gear racks within the mold, which not only increases the complexity of the mold. Furthermore, most existing molds adopt a "one-out-one" structure (i.e., molding one product at a time). While this design simplifies mold manufacturing and maintenance, it results in low production efficiency, high unit costs, and a lack of competitiveness in the final product market. Summary of the Invention

[0003] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, the embodiments of this utility model propose a rotary demolding mechanism for external helical gear injection molds. By setting a rotating block and a driving block, an electric drive system is not required, which simplifies the structure and improves stability. Multiple driving blocks enable "one-to-many" production, which greatly improves production capacity, reduces costs, and enhances market competitiveness.

[0004] This utility model embodiment also proposes an injection mold having the above-mentioned rotary demolding mechanism.

[0005] The technical solution adopted by this utility model is as follows: a rotary demolding mechanism for an external helical gear injection mold is provided, including a moving template, a top plate, and multiple driving blocks. The driving blocks are connected to the top plate. The upward movement of the top plate drives the driving blocks to move in the direction of separating from the moving template. A rotating block is provided between each pair of connected driving blocks. The rotating block is rotatably mounted on the moving template and has a helical tooth forming part for forming the helical gear. The rotating block and the driving block are combined to form a wedge structure, changing the ejection action of the driving block into the rotation action of the rotating block, which is used to rotate out the formed helical gear.

[0006] With the above structure, the rotary demolding mechanism eliminates the need for a complex electric drive system after molding. Instead, the rotating block rotates due to the movement of the drive block, completing the demolding process of the helical gear. This design not only simplifies the mold structure but also reduces the use of complex components such as motors and gears, lowering costs and improving the stability and reliability of the mold.

[0007] Meanwhile, through the ingenious application of the wedge structure, the ejection action of the drive block not only completes the ejection process but also drives the rotation of the rotating block, allowing the helical gear to smoothly spin out of the mold. Furthermore, the design of multiple (at least three) drive blocks enables a "one-out-many" design for the mold, meaning that the same mold can produce at least two helical gears at a time, greatly improving production capacity per unit time and reducing unit cost. This enhances the product's market competitiveness while meeting market demands.

[0008] According to one embodiment of the present invention, the wedge structure includes an inclined guide groove and an inclined guide block. One of the driving block and the rotating block is provided with an inclined guide groove, and the other is provided with an inclined guide block. Through the cooperation of the inclined guide groove and the inclined guide block, the driving block can move along the inclined guide groove under the action of ejection, and drive the rotating block to rotate in the mold.

[0009] According to one embodiment of the present invention, the driving block is provided with two inclined guide blocks on its side, and the rotating block is provided with two inclined guide grooves on its side; the two inclined guide blocks on a single driving block are used to connect two rotating blocks, and the two inclined guide grooves on a single rotating block are used to distribute the force evenly, avoid jamming, and improve the stability of the mold and the smoothness of the production process.

[0010] According to one embodiment of the present invention, the number of driving blocks is four and arranged at four corners, and the four rotating blocks are distributed at the line connecting the four corners; the four driving blocks, through this arrangement, can drive the rotating blocks more evenly, ensuring that the force on each rotating block is more uniform during the molding process, and avoiding mold deformation or uneven demolding caused by excessive force at a certain angle.

[0011] According to one embodiment of the present invention, a central cover plate is fixedly installed on the moving template; by installing the central cover plate, the axial displacement problem that may occur during the operation of the rotating block is effectively solved, ensuring the stable position of the rotating block in the mold, thereby avoiding the situation of decreased molding accuracy or unsmooth demolding caused by axial displacement.

[0012] According to one embodiment of the present invention, the rotating block is provided with an arc-shaped first limiting notch, and the edge of the central cover plate abuts against the first limiting notch, and / or; The arc length of the edge of the central cover plate is less than the arc length of the first limiting notch.

[0013] According to one embodiment of the present invention, an outer cover plate is fixedly installed on the moving template, and the number of the outer cover plates is equal to the number of the rotating blocks.

[0014] According to one embodiment of the present invention, the rotating block is provided with a second limiting notch, and the edge of the outer cover plate abuts against the second limiting notch; the outer cover plate and the central cover plate respectively limit the rotating block on both sides.

[0015] According to one embodiment of the present invention, the top plate is connected to the drive block via a top rod.

[0016] An injection mold includes any of the external helical gear injection mold rotation demolding mechanisms described above. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the plastic part in the embodiment of this utility model.

[0019] Figure 2 This is an exploded view of the plastic part in an embodiment of this utility model.

[0020] Figure 3 This is a perspective view of the moving mold assembly in an embodiment of this utility model.

[0021] Figure 4 This is a perspective view of the moving mold assembly during mold opening in an embodiment of this utility model.

[0022] Figure 5 This is a schematic diagram of the moving mold assembly during mold opening in an embodiment of this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of the rotating block, driving block, and central cover plate when they are closed in an embodiment of this utility model.

[0024] Figure 7 This is a schematic diagram of the structure of the rotating block, driving block, and central cover plate during mold opening in an embodiment of this utility model.

[0025] Figure 8 This is a schematic diagram of the rotating block in an embodiment of the present invention.

[0026] Figure 9 This is a perspective view of the driving block in an embodiment of the present invention.

[0027] Explanation of the labels in the diagram: 10. Plastic parts; 20. Moving mold components; 11. Helical gear; 12. Insert; 21. Moving template; 22. Top plate; 23. Rotating block; 24. Drive block; 25. Outer cover plate; 26. Center cover plate; 27. Top rod; 23a. Inclined guide groove; 23b. Inclined tooth forming part; 23c. First limiting notch; 23d. Second limiting notch; 24a. Inclined guide block. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0029] like Figure 3-9 As shown, this embodiment discloses a rotary demolding mechanism for an injection mold of an external helical gear 11, including a moving template 21, a top plate 22, and multiple driving blocks 24. The driving blocks 24 are connected to the top plate 22. The upward movement of the top plate 22 drives the driving blocks 24 to move in the direction of separating from the moving template 21. A rotating block 23 is provided between each pair of connected driving blocks 24. The rotating block 23 is rotatably mounted on the moving template 21 and has a helical tooth forming part 23b for forming the helical gear 11. The rotating block 23 and the driving block 24 are combined to form a wedge structure, changing the ejection action of the driving block 24 into the rotation action of the rotating block 23, which is used to rotate out the formed helical gear 11.

[0030] Combination Figure 1-2 As shown, in this embodiment, the plastic part 10 includes a helical gear 11 and an insert 12, wherein the helical gear 11 is an injection-molded part, and the insert 12 is a prefabricated metal structure. One end of the insert 12 is provided with a spline structure to enhance the bonding force between the helical gear 11 and the insert 12. The outer periphery of the helical gear 11 has inclined external teeth, and the corresponding helical tooth forming part 23b has a contour structure for forming the external teeth.

[0031] Furthermore, combined Figure 3-4As shown, in this embodiment, the moving template 21 is connected to the moving part of the injection molding machine, and the top plate 22 is connected to the ejection part of the injection molding machine. The top plate 22 is installed at the bottom of the moving template 21, and the top plate 22 is connected to the moving template 21 through four ejector rods 27. The top ends of the ejector rods 27 pass through the moving template 21 and are fixedly connected to the drive block 24. When the mold is closed, the drive block 24 is embedded in the moving template 21; when the mold is opened, the top plate 22 moves towards the moving template 21, and the ejector rods 27 drive the drive block 24 to be ejected synchronously, so that the drive block 24 protrudes from the surface of the moving template 21. The wedge structure converts the ejection action of the drive block 24 into the rotation action of the rotating block 23. The external teeth of the helical gear 11 after molding rotate relative to the helical gear forming part 23b, and causes the helical gear 11 to move axially between the rotating block 23, and finally causes the helical gear 11 to disengage from the rotating block 23, completing the demolding.

[0032] Specifically, in combination Figure 6-7 As shown, the wedge structure includes an inclined guide groove 23a and an inclined guide block 24a. One of the driving block 24 and the rotating block 23 is provided with an inclined guide groove 23a, and the other is provided with an inclined guide block 24a. Furthermore, the driving block 24 has two inclined guide blocks 24a arranged laterally, and the rotating block 23 has two inclined guide grooves 23a arranged laterally. There are four driving blocks 24 arranged at the four corners, and the four rotating blocks 23 are distributed at the line connecting the four corners.

[0033] Furthermore, in this embodiment, the main body of the drive block 24 is generally square, and its two adjacent sides are provided with inclined guide blocks 24a. The inclined guide blocks 24a protrude from the side of the drive block 24 and are inclined along the ejection direction. The inclination angle of the inclined guide blocks 24a corresponds to the inclination angle of the external teeth of the helical gear 11.

[0034] Specifically, in combination Figure 7-9 As shown, a central cover plate 26 is fixedly installed on the moving template 21. The rotating block 23 has an arc-shaped first limiting notch 23c, and the edge of the central cover plate 26 abuts against the first limiting notch 23c. An outer cover plate 25 is fixedly installed on the moving template 21, and the number of outer cover plates 25 is equal to the number of rotating blocks 23. The rotating block 23 has a second limiting notch 23d, and the edge of the outer cover plate 25 abuts against the second limiting notch 23d; the outer cover plate 25 and the central cover plate 26 respectively limit the rotation of the rotating block 23 on both sides.

[0035] To further explain, in this embodiment, the central cover plate 26 is located at the center of the four rotating blocks 23, and its four edges are arc-shaped with an arc length less than the arc length of the first limiting notch 23c, ensuring that the central cover plate 26 can effectively limit the rotation stroke of the rotating blocks 23. When installing the rotating blocks 23, the rotating blocks 23 are first embedded into the moving template 21, and the inclined guide groove 23a on the rotating blocks 23 engages with the inclined guide block 24a on the driving block 24. Subsequently, the central cover plate 26 and the outer cover plate 25 are connected to the moving template 21 to ensure that the rotating blocks 23 do not detach from the moving template 21 while rotating relative to it.

[0036] In another embodiment, an injection mold is disclosed, including the external helical gear 11 injection mold rotation demolding mechanism described in this embodiment.

[0037] Furthermore, in another embodiment, the injection mold includes a fixed mold assembly (not shown in the figure) and a moving mold assembly 20, the moving mold assembly 20 including the external helical gear 11 injection mold rotation demolding mechanism described in this embodiment.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotary demolding mechanism for an external helical gear injection mold, characterized in that, It includes a moving template, a top plate, and multiple driving blocks. The driving blocks are connected to the top plate. The upward movement of the top plate causes the driving blocks to move in the direction of separating from the moving template. A rotating block is provided between every two connected driving blocks. The rotating block is rotatably mounted on the moving template and has a helical tooth forming part for forming helical gears. The rotating block and the driving block are combined to form a wedge structure, changing the ejection action of the driving block into the rotation action of the rotating block, which is used to rotate out the formed helical gear.

2. The rotary demolding mechanism for an external helical gear injection mold according to claim 1, characterized in that: The wedge structure includes a wedge groove and a wedge block. One of the driving block and the rotating block is provided with a wedge groove, and the other is provided with a wedge block.

3. The rotary demolding mechanism for an external helical gear injection mold according to claim 2, characterized in that: The drive block is provided with two oblique guide blocks on its side, and the rotating block is provided with two oblique guide grooves on its side.

4. The rotary demolding mechanism for an external helical gear injection mold according to claim 1, characterized in that: The number of driving blocks is four, arranged at the four corners, and the four rotating blocks are distributed at the line connecting the four corners.

5. The rotary demolding mechanism for an external helical gear injection mold according to claim 1, characterized in that: A central cover plate is fixedly installed on the moving template.

6. The rotary demolding mechanism for an external helical gear injection mold according to claim 5, characterized in that: The rotating block is provided with an arc-shaped first limiting notch, and the edge of the central cover plate abuts against the first limiting notch, and / or; The arc length of the edge of the central cover plate is less than the arc length of the first limiting notch.

7. The rotary demolding mechanism for an external helical gear injection mold according to claim 1, characterized in that: An outer cover plate is fixedly installed on the moving template, and the number of the outer cover plates is equal to the number of the rotating blocks.

8. The rotary demolding mechanism for an external helical gear injection mold according to claim 7, characterized in that: The rotating block is provided with a second limiting notch, and the edge of the outer cover plate abuts against the second limiting notch.

9. The rotary demolding mechanism for an external helical gear injection mold according to claim 1, characterized in that: The top plate is connected to the drive block via a top rod.

10. An injection mold, characterized in that: Includes the external helical gear injection mold rotary demolding mechanism as described in any one of claims 1-9.

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