Helical tooth insert for core-pulling mechanism

Abstract

The utility model discloses a helical tooth insert for a core-pulling mechanism. The helical tooth insert comprises a main body, a limiting bulge, an outer tooth part and an inner tooth part, wherein the main body is of a semi-annular three-dimensional structure, and the main body, the limiting protrusion, the outer tooth part and the inner tooth part are of an integrated structure; a driving part of the core-pulling mechanism is meshed with the outer tooth part, and the inner tooth part is matched with a product for forming; a driving part of the core pulling mechanism provides driving force to drive the outer tooth part, the outer tooth part drives the semi-annular three-dimensional structure to rotate axially, the semi-annular three-dimensional structure drives the inner tooth part, and the inner tooth part drives the product to perform core pulling work in the mold opening direction; the inner tooth part is a helical tooth part, and the helical angle of the helical tooth part is matched with the helical angle of a product; and the height of the main body along the axial direction is not less than the height of the product along the axial direction. And the loading force of the product, the ejector pin and the helical tooth insert in the ejection process of the mold is greatly reduced, so that the loss of parts is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to a helical tooth insert for a core pulling mechanism. Background Art

[0002] Manufacturing Figure 6 For products with helical gear shapes, it is generally necessary to engage the helical tooth portion of the product with the helical tooth insert so that the product can be ejected and rotated at the same time during the mold opening and ejection process to achieve the purpose of core pulling; or the helical tooth insert and the product can be ejected together, and then the product can be ejected a second time, so that the helical tooth insert and the product can be rotated and core pulled for forced demolding.

[0003] However, in actual production, during the ejection process of the injection mold, the product and the helical tooth insert are often in a locked state, resulting in a greater driving force for the relative rotation of the product and the helical tooth insert to eject, which puts a huge load on the product, the ejector pin and the helical tooth insert, easily causing damage to the parts; and when the mold is reset, the movable mold and the helical tooth insert need to be inserted and returned to their original position, which can also easily damage the parts.

[0004] Therefore, how to optimize the structure of the helical tooth insert and reduce the damage to the product and equipment parts during the core pulling process of the mold is one of the technical problems that technicians in this field need to solve. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the purpose of the utility model is to provide a helical tooth insert for a core pulling mechanism.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A helical tooth insert for a core pulling mechanism, comprising a main body, a limiting protrusion, an outer tooth portion, and an inner tooth portion; wherein the main body is a semicircular three-dimensional structure, which forms an integral structure with the limiting protrusion, the outer tooth portion, and the inner tooth portion; the driving portion of the core pulling mechanism meshes with the outer tooth portion, and the inner tooth portion cooperates with the product to be formed;

[0008] The driving part of the core-pulling mechanism provides a driving force to drive the outer tooth portion, and the outer tooth portion drives the semicircular annular three-dimensional structure to rotate axially, and the semicircular annular three-dimensional structure drives the inner tooth portion, and the inner tooth portion drives the product to perform core pulling along the mold opening direction;

[0009] The inner tooth portion is a helical tooth portion, and the helical angle of the helical tooth portion is adapted to the helical angle of the product;

[0010] The height of the main body along its axial direction is not less than the height of the product along its axial direction.

[0011] Further preferably, the outer tooth portion includes a gear rack, and the gear rack is vertically fixed on the outer surface of the semicircular ring-shaped three-dimensional structure.

[0012] Further preferably, the gear rack includes a gear meshing surface, and the gear meshing surface is meshed with the driving part.

[0013] Further preferably, the inner tooth portion includes an oblique rack, and the oblique rack is vertically fixed on the inner wall surface of the semicircular ring-shaped three-dimensional structure.

[0014] Further preferably, the helical rack includes a helical tooth meshing surface, and the helical tooth meshing surface meshes with the product.

[0015] Further preferably, the helix angle is 5°-85°.

[0016] Further preferably, the helix angle is 30°.

[0017] Further preferably, the helical tooth insert further includes a guide through hole and a guide rod, the guide through hole passes through the semicircular annular three-dimensional structure along the mold opening direction, the guide rod passes through the guide through hole and is slidably connected to the guide through hole, and the guide rod is fixedly connected to the rear mold core.

[0018] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0019] In this solution, the main body, limiting protrusion, outer tooth portion and inner tooth portion are manufactured by integral molding; the outer tooth portion meshes with the driving portion of the core-pulling mechanism, and the inner tooth portion meshes with the product; the driving portion provides driving force to drive the outer tooth portion, the outer tooth portion drives the main body to rotate axially, the main body drives the inner tooth portion, and the inner tooth portion drives the product to perform core pulling along the mold opening direction, which greatly reduces the load force on the product, ejector pin and helical tooth insert during the ejection process of the mold, thereby reducing the loss of parts and extending the service life of the equipment; and the helical tooth insert does not need to be ejected at the same time during the ejection process, so that the mold does not need to be inserted and returned to its original position when it is reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a helical tooth insert for a core pulling mechanism described in an embodiment of the present utility model;

[0021] Figure 2 It is a top view of a helical tooth insert for a core pulling mechanism described in an embodiment of the present utility model;

[0022] Figure 3 It is a side view of a helical tooth insert for a core pulling mechanism described in an embodiment of the present utility model;

[0023] Figure 4This is a schematic diagram of the core pulling process of the core pulling mechanism in the embodiment of the utility model. Figure 1 ;

[0024] Figure 5 This is a schematic diagram of the core pulling process of the core pulling mechanism in the embodiment of the utility model. Figure 2 ;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the product described in the embodiment of the utility model.

[0026] The symbols of the drawings in the above description are as follows:

[0027] 100, helical tooth insert; 110, outer tooth portion; 120, inner tooth portion; 130, limiting protrusion; 140, guide through hole; 150, guide rod;

[0028] 200, gear;

[0029] 300, gear drive rod;

[0030] 410, front mold core; 420, rear mold core;

[0031] 500. Products. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are all based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element of the present invention must have a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] Example

[0035] It should be noted that: Figure 3 In the figure, the dotted line A and the dotted line B are only provided for the convenience of description, and the dotted line A structure and the dotted line B structure do not exist in the actual helical tooth insert 100 .

[0036] The helical tooth insert 100 is assembled between the front mold core 410 and the rear mold core 420 in the injection mold, and engages with the driving component of the core pulling mechanism to drive the product 500 in the product molding cavity to perform ejection and core pulling operations.

[0037] like Figures 1 to 3As shown, the utility model discloses a helical tooth insert 100 for a core pulling mechanism, comprising a main body, a limiting protrusion 130, an outer tooth portion 110, an inner tooth portion 120, a guide through hole 140 and a guide rod 150; the main body is a semicircular ring-shaped three-dimensional structure, the semicircular ring-shaped three-dimensional structure is fixedly connected to the limiting protrusion 130, the outer tooth portion 110 is fixedly arranged on the outer surface of the semicircular ring-shaped three-dimensional structure, and the inner tooth portion 120 is opened on the inner wall of the semicircular ring-shaped three-dimensional structure; the guide through hole 140 passes through the semicircular ring-shaped three-dimensional structure along the mold opening direction, the guide rod 150 passes through the guide through hole 140 and is slidably connected to the guide through hole 140, and the guide rod 150 is fixedly connected to the rear mold core 420;

[0038] It is worth noting that the semicircular ring-shaped three-dimensional structure, the limiting protrusion 130, the outer tooth portion 110, and the inner tooth portion 120 are manufactured by integral molding, which has high strength and structural stability and can be used in the mold for a long time.

[0039] Specifically:

[0040] like Figures 1 to 3 As shown, the semicircular ring-shaped three-dimensional structure is along Figure 3 The cross section in the direction of the dotted line B is in the shape of a semicircle, and both ends of the semicircular three-dimensional structure are in the shape of rectangles along the mold opening direction.

[0041] like Figures 1 to 3 As shown, the limiting protrusion 130 is arranged below the semicircular ring-shaped three-dimensional structure along the mold opening direction and is fixedly connected to the semicircular ring-shaped three-dimensional structure. The limiting protrusion 130 and the semicircular ring-shaped three-dimensional structure are integrally injection molded; the limiting protrusion 130 is along the mold opening direction. Figure 3 The cross-section in the direction of the middle dotted line B is an arc-shaped strip protrusion, the curvature of the arc-shaped strip protrusion is the same as the curvature of the semicircular ring-shaped three-dimensional structure, and the center of the arc-shaped strip protrusion is the same as that of the semicircular ring-shaped three-dimensional structure; the limiting protrusion 130 is away from one side of the semicircular ring-shaped three-dimensional structure and penetrates into the bevel tooth insert limiting groove of the rear mold core 420, so that the bevel tooth insert 100 rotates in the bevel tooth insert limiting groove with the center of the semicircular ring-shaped three-dimensional structure as the center.

[0042] like Figures 1 to 3 As shown, the outer tooth portion 110 includes a gear rack, which is vertically fixed on the outer surface of the semicircular ring-shaped three-dimensional structure; Figure 3The cross-section in the direction of the middle dotted line B is a U-shaped strip-shaped protruding structure, with the U-shaped open end of the U-shaped strip-shaped protruding structure facing the semicircular ring-shaped three-dimensional structure; the outer surfaces of both sides of the U-shaped strip-shaped protruding structure are gear meshing surfaces, which mesh with the gear 200 of the core-pulling mechanism; there are multiple gear racks, and the multiple gear racks are evenly arranged on the outer surface of the semicircular ring-shaped three-dimensional structure at equal distances and in parallel; so that the gear 200 drives the helical tooth insert 100 to rotate axially with the center of the semicircular ring-shaped three-dimensional structure as the center during the core pulling process;

[0043] Preferably, the number of the gear racks ranges from 3 to 10, and in the present invention, the number of the gear racks is 5.

[0044] like Figure 3 As shown, the inner tooth portion 120 is a helical tooth portion, and the helical angle of the helical tooth portion is adapted to the helical angle of the product 500; the inner tooth portion 120 includes an oblique rack, and the oblique rack is vertically fixed on the inner wall surface of the semicircular annular three-dimensional structure; the oblique rack is along Figure 3 The cross section in the direction of the middle dotted line B is a U-shaped strip-shaped protruding structure, and the U-shaped open end of the U-shaped strip-shaped protruding structure faces the semicircular ring-shaped three-dimensional structure; the outer surfaces of both sides of the U-shaped strip-shaped protruding structure are helical tooth meshing surfaces, and the helical tooth meshing surfaces are meshed with the helical tooth portion of the product 500; the number of the helical racks is several, and the several wheel racks are equidistant and parallel and evenly arranged on the outer surface of the semicircular ring-shaped three-dimensional structure; the helical racks are arranged along Figure 3 The dotted line A is arranged on the inner wall surface of the semicircular annular three-dimensional structure and is aligned with Figure 3 The dotted line B is set at a certain angle; when the beveled tooth insert 100 is driven and rotates axially with the center of the semicircular ring-shaped three-dimensional structure as the center, the beveled tooth insert 100 drives the product 500 away from the rear mold core 420 along the mold opening direction;

[0045] Preferably, the number of the gear racks ranges from 6 to 20, and in the present invention, the number of the gear racks is 12; Figure 3 The angle between the dotted line A and the dotted line B ranges from 5° to 85°. In the present invention, the helical angle of the inner tooth portion 120 is 30°. Figure 3 The angle between the dashed line A and the dashed line B is shown to be 60°.

[0046] like Figures 1 to 3 As shown, the guide hole 140 passes through the semicircular ring-shaped three-dimensional structure along the mold opening direction. Figure 3The cross section in the direction of the dotted line B is a rectangular through hole, and the two ends of the rectangular through hole are semicircular; there are two guide through holes 140, and the two guide through holes 140 are symmetrically distributed on both sides of the axis of the semicircular ring-shaped three-dimensional structure along the mold opening direction.

[0047] like Figures 1 to 3 As shown, the guide rod 150 is a screw-shaped columnar structure, which includes a limiting end and a columnar rod. The limiting end is fixedly connected to the columnar rod end, and the limiting end and the columnar rod are an integral injection molding structure; the outer diameter of the limiting end is larger than the outer diameter of the columnar rod; the limiting end extends into the guide through hole 140 and conflicts with the guide through hole 140, one end of the columnar rod is fixedly linked to the limiting end, and the other end of the columnar rod passes through the guide through hole 140 along the mold opening direction and is fixedly connected to the rear mold core 420, so that the The guide rod 150 is slidably connected to the guide through hole 140; that is, the guide rod 150 generates relative displacement relative to the guide through hole 140 in the guide through hole 140, and the relative displacement of the guide rod 150 in the guide through hole 140 is limited in the guide through hole 140; thereby, the rotational displacement of the helical tooth insert 100 in the helical tooth insert limiting groove is limited; there are two guide rods 150, and the two guide rods 150 respectively pass through the two guide through holes 140 along the mold opening direction, and are respectively fixedly connected to the rear mold core 420.

[0048] The following describes the assembly of the helical tooth insert 100 by taking the core pulling mechanism of a mold as an example, but the installation and application of the helical tooth insert 100 are not limited to the contents of this example.

[0049] The specific structure of the core pulling mechanism is as follows:

[0050] like Figures 4 and 5 As shown, the core-pulling mechanism includes a driving portion and a beveled tooth insert 100, the driving portion engages with the beveled tooth insert 100, the beveled tooth insert 100 engages with the product 500 in the product molding cavity, the driving portion drives the beveled tooth insert 100 to rotate, and the beveled tooth insert 100 drives the product 500 to perform a core-pulling operation in a direction away from the product molding cavity.

[0051] like Figures 4 and 5As shown, the driving part includes a gear pressing block, a gear 200, a gear tray and a gear driving rod 300. The gear tray is assembled in the rear mold core 420, and the gear 200 is assembled on the gear tray; the gear pressing block is assembled on the gear 200 and fixedly connected to the rear mold core 420; one end of the gear driving rod 300 is fixedly connected to the ejector plate assembly of the ejection mechanism in the mold, and the other end of the gear driving rod 300 passes through the rear mold core 420 and is slidably connected to the gear 200; the gear 200 is engaged with the helical tooth insert 100;

[0052] The gear 200 includes a gear guide protrusion, which is evenly and symmetrically distributed on the inner wall of the annular gear along the mold opening direction; the gear driving rod 300 includes a driving rod guide groove, which is provided on the outer surface of the gear driving rod 300 on the side close to the gear 200, and the opening direction of the driving rod guide groove is toward the inner wall of the gear 200; the driving rod guide groove is adapted to the gear guide protrusion, so that the gear guide protrusion can generate a sliding displacement in the driving rod guide groove relative to the driving rod guide groove, thereby making the gear driving rod 300 slidably connected to the gear 200;

[0053] The gear drive rod 300 includes a first drive rod guide groove and a second drive rod guide groove, wherein the first drive rod guide groove is connected to the second drive rod guide groove; the second drive rod guide groove is provided on the outer surface of the gear drive rod 300 and is provided along the axial direction of the gear drive rod 300; the first drive rod guide groove is spirally provided on the outer surface of the gear drive rod 300 and extends toward an edge of the gear drive rod 300 near the gear 200;

[0054] When the gear drive rod 300 is driven, the gear drive rod 300 is ejected along the mold opening direction toward the front mold core 410; the gear guide protrusion slides relative to the first drive rod guide groove toward the second drive rod guide groove in the first drive rod guide groove, so that the gear guide protrusion drives the gear 200 to rotate with the axis of the gear 200 as the center of the circle; the gear 200 drives the helical gear insert 100 to rotate in the helical gear insert limiting groove, and the helical gear insert 100 drives the product 500 to perform a core pulling operation in the direction away from the rear mold core 420.

[0055] In summary, the working principle of the core pulling mechanism is as follows:

[0056] like Figures 4 and 5As shown, in the mold opening state, the ejector plate group is driven to drive the gear drive rod 300 to perform ejection displacement along the mold opening direction toward the front mold core 410, and the gear drive rod 300 drives the gear guide protrusion in the drive rod guide groove to move from the first drive rod guide groove to the second drive rod guide groove, and the gear guide protrusion drives the gear 200 to rotate with the axis of the gear 200 as the center of the circle; the gear 200 drives the helical gear insert 100, so that the helical gear insert 100 rotates in the helical gear insert limiting groove with the center of the semicircular ring-shaped three-dimensional structure as the center of the circle; The helical tooth insert 100 drives the product 500 to perform core-pulling displacement along the mold opening direction toward the front mold core 410; when the gear guide protrusion is positioned from the first drive rod guide groove to the second drive rod guide groove, the rotational displacement of the gear 200 ends; at the same time, the two guide rods 150 are in the two guide through holes 140, and the relative displacement generated relative to the two guide through holes 140 is restricted, so that the rotational displacement of the helical tooth insert 100 in the helical tooth insert limiting groove ends, and further the core-pulling displacement of the product 500 along the mold opening direction toward the front mold core 410 ends.

[0057] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A helical tooth insert for a core pulling mechanism, characterized in that: It includes a main body, a limiting protrusion, an outer tooth portion, and an inner tooth portion; wherein: The main body is a semicircular three-dimensional structure, which is an integrated structure with the limiting protrusion, the outer tooth portion, and the inner tooth portion; the driving part of the core pulling mechanism is engaged with the outer tooth portion, and the inner tooth portion cooperates with the product to be formed; The driving part of the core-pulling mechanism provides a driving force to drive the outer tooth portion, and the outer tooth portion drives the semicircular annular three-dimensional structure to rotate axially, and the semicircular annular three-dimensional structure drives the inner tooth portion, and the inner tooth portion drives the product to perform core pulling along the mold opening direction; The inner tooth portion is a helical tooth portion, and the helical angle of the helical tooth portion is adapted to the helical angle of the product; The height of the main body along its axial direction is not less than the height of the product along its axial direction.

2. The helical tooth insert for a core pulling mechanism according to claim 1, characterized in that: The outer tooth portion includes a gear rack, and the gear rack is vertically fixed on the outer surface of the semicircular ring-shaped three-dimensional structure.

3. The helical tooth insert for a core pulling mechanism according to claim 2, characterized in that: The gear rack includes a gear meshing surface, and the gear meshing surface is connected to the drive.

4. The helical tooth insert for a core pulling mechanism according to claim 1, characterized in that: The inner tooth portion includes an oblique rack, and the oblique rack is vertically fixed on the inner wall surface of the semicircular ring-shaped three-dimensional structure.

5. The helical tooth insert for a core pulling mechanism according to claim 4, characterized in that: The helical rack includes a helical tooth engagement surface that engages with the product.

6. The helical tooth insert for a core pulling mechanism according to claim 5, characterized in that: The helix angle is 5°-85°.

7. The helical tooth insert for a core pulling mechanism according to claim 6, characterized in that: The helix angle is 30°.

8. The helical tooth insert for a core pulling mechanism according to claim 1, characterized in that: The helical tooth insert also includes a guide hole and a guide rod. The guide hole penetrates the semicircular ring-shaped three-dimensional structure along the mold opening direction. The guide rod passes through the guide hole and is slidably connected to the guide hole. The guide rod is fixedly connected to the rear mold core.

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