Helical gear self-rotation ejection mechanism and mold

Abstract

The utility model relates to the field of dies, in particular to a helical gear self-rotation ejection mechanism and a die, the helical gear self-rotation ejection mechanism provided by the utility model comprises a rotary die core, two plane bearings, a ball bearing and an ejection rod, a first end of the rotary die core forms a cavity for forming a helical gear, and a second end of the rotary die core forms a second cavity for forming the helical gear; a flange is formed at the second end of the rotary mold core, the two plane bearings are arranged at the second end of the rotary mold core to clamp the flange, the ball bearing is arranged at the first end of the rotary mold core and is in clearance fit with the outer wall of the rotary mold core, and the ejector rod is inserted into the cavity from the second end of the rotary mold core to eject the cooled bevel gear out. The technical problems that in the prior art, a bevel gear is inconvenient to machine, tooth-shaped shrinkage holes are prone to occurring, and the surface shrinks are solved.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to a helical gear self-rotating ejection mechanism and a mold. Background Art

[0002] For injection molded parts with a wall thickness of more than 6mm, there will be internal shrinkage holes, surface shrinkage, dimensional instability and other problems. For conventional spur gear injection molding, it is easy to achieve this by directly molding the gear structure mold. However, for some thicker wall helical gears, they are generally injection molded into cylindrical products, and then the tooth shape is processed by post-hobbing. Shrinkage holes often appear on the processed tooth shape, affecting the overall strength of the product. Sometimes the surface shrinks severely, resulting in no residual processing in some parts. Utility Model Content

[0003] In order to solve the technical problems in the prior art that helical gears are difficult to process and are prone to tooth shrinkage holes and surface shrinkage, the present application proposes a helical gear self-rotating ejection mechanism and mold to solve the above technical problems.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The utility model provides a helical gear self-rotating ejection mechanism, comprising: a rotating mold core, a first end of the rotating mold core is formed with a cavity for molding the helical gear, and a second end of the rotating mold core is formed with a flange; two plane bearings, the two plane bearings are arranged at the second end of the rotating mold core to clamp the flange; a ball bearing, the ball bearing is arranged at the first end of the rotating mold core and is gap-matched with the outer wall of the rotating mold core; and a push rod, the push rod is inserted into the cavity from the second end of the rotating mold core to eject the cooled helical gear.

[0006] Furthermore, it also includes a filling block, which is inserted from the second end of the rotating mold core to form the cavity at the first end of the rotating mold core.

[0007] Furthermore, it also includes an inner column, which is fixed in the cavity to form the inner ring of the helical gear.

[0008] Furthermore, the push rods include four push rods, and the four push rods are arranged in a ring shape on the outer periphery of the inner column.

[0009] Furthermore, it comprises two sets of the above-mentioned helical gear self-rotating ejection mechanisms.

[0010] Furthermore, a pressure ring is disposed at the first end of the rotating mold core, and the pressure ring presses the ball bearing into the mold body, and the pressure ring is loosely matched with the outer ring of the rotating mold core.

[0011] Furthermore, it comprises an injection channel, which is formed in the mold body, and one end port of the injection channel is arranged at the finished product ejection end of the cavity.

[0012] Based on the above technical solution, the technical effects that can be achieved by the utility model are:

[0013] The helical gear self-rotating ejection mechanism of the utility model directly forms the shape of the helical gear through the cavity of the first end of the rotating mold core, and realizes the forming of the helical gear through the rotation of the rotating mold core. Specifically, three bearings are arranged on the rotating mold core, which are the ball bearings at the first end of the rotating mold core. The ball bearings are matched with the outer wall of the rotating mold core in a clearance, so as to avoid jamming due to different expansion coefficients during heating. At the same time, the ball bearings can also play a role of straightening while the rotating mold core rotates. Under the action of the ejector pin, when the mold is opened and ejected, as the product in the cavity moves upward, the rotating mold core will rotate until the helical gear as the product is separated from the cavity. The cavity is driven by the upward force of the needle, and the rotating mold core as the product is driven to rotate, so as to perform subsequent demolding action. The utility model has better demolding efficiency, and does not need to add an external oil cylinder or a motor for rotational drive. The overall structure is simple, the applicability is good, the production cost is low, and the product strength will not be affected. The technical problems of inconvenient processing of helical gears and easy occurrence of tooth shrinkage holes and surface shrinkage in the prior art are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the helical gear self-rotating ejection mold of the utility model;

[0015] Figure 2 It is a top view of the helical gear self-rotating ejection mechanism of the utility model.

[0016] Among them: 1-rotating mold core, 11-cavity, 12-flange; 2-plane bearing; 3-ball bearing; 4-throw rod; 5-filling block; 6-inner column; 7-pressure ring; 8-injection channel. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] like Figure 1-2As shown, the utility model provides a self-rotating ejection mechanism for a helical gear, comprising a rotating mold core 1, two plane bearings 2, a ball bearing 3 and a ejector rod 4. A cavity 11 for molding the helical gear is formed at the first end of the rotating mold core 1, a flange 12 is formed at the second end of the rotating mold core 1, two plane bearings 2 are arranged at the second end of the rotating mold core 1 to clamp the flange 12, the ball bearing 3 is arranged at the first end of the rotating mold core 1, and is gap-matched with the outer wall of the rotating mold core 1, and the ejector rod 4 is inserted into the cavity 11 from the second end of the rotating mold core 1 to eject the cooled helical gear.

[0019] The helical gear self-rotating ejection mechanism of the utility model directly forms the shape of the helical gear through the cavity 11 at the first end of the rotating mold core 1, and the forming of the helical gear is realized by the rotation of the rotating mold core 1. Specifically, three bearings are arranged on the rotating mold core 1, namely, the ball bearing 3 at the first end of the rotating mold core 1. The ball bearing 3 and the outer wall of the rotating mold core 1 are matched with each other in clearance, which can avoid jamming due to different expansion coefficients during heating. At the same time, the ball bearing 3 can also play a role of straightening while the rotating mold core 1 rotates. Under the action of the ejector, the mold is opened and ejected. As the product in the cavity 11 moves upward, the rotating mold core 1 will rotate until the bevel gear as the product is separated from the cavity 11. The cavity 11 is driven by the upward force of the needle, and the bevel gear as the product drives the rotating mold core 1 to rotate, thereby performing subsequent demolding action, which has better demolding efficiency and does not require external oil cylinders or motors for rotational drive. The overall structure is simple, the applicability is good, the production cost is low, and the strength of the product is not affected. The technical problems of the prior art that the bevel gear is inconvenient to process and is prone to tooth shrinkage holes and surface shrinkage are solved.

[0020] In a specific embodiment of the present invention, a filling block 5 is further included. The filling block 5 is inserted from the second end of the rotating mold core 1 to form a mold cavity 11 at the first end of the rotating mold core 1 .

[0021] In a specific embodiment of the present invention, an inner column 6 is further included, and the inner column 6 is fixed in the cavity 11 to form the inner ring of the helical gear. Specifically, the inner column 6 is fixed on the filling block 5.

[0022] In a specific embodiment of the present invention, the push rods 4 include four push rods 4 , which are arranged in a ring shape on the outer periphery of the inner column 6 . Specifically, the four push rods 4 are all movably configured on the filling block 5 .

[0023] In another aspect of the utility model, a helical gear self-rotating ejection mold is provided, comprising two sets of helical gear self-rotating ejection mechanisms, and the two sets of helical gear self-rotating ejection mechanisms are arranged in a mold body.

[0024] In a specific embodiment of the present invention, a pressure ring 7 is disposed at the first end of the rotating mold core 1, and the pressure ring 7 presses the ball bearing 3 into the mold body, and the pressure ring 7 is loosely matched with the outer ring of the rotating mold core 1 to prevent jamming.

[0025] In a specific embodiment of the present invention, an injection channel 8 is included. The injection channel 8 is formed in the mold body, and one end of the injection channel 8 is configured at the finished product ejection end of the cavity 11 .

[0026] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A helical gear self-rotating ejection mechanism, characterized in that: include: A rotating mold core (1), wherein a mold cavity (11) for molding a helical gear is formed at a first end of the rotating mold core (1), and a flange (12) is formed at a second end of the rotating mold core (1); Two plane bearings (2), the two plane bearings (2) being arranged at the second end of the rotating mold core (1) to clamp the flange (12); A ball bearing (3), the ball bearing (3) being arranged at the first end of the rotating mold core (1) and being clearance-matched with the outer wall of the rotating mold core (1); A push rod (4) is inserted from the second end of the rotating mold core (1) into the mold cavity (11) to eject the cooled helical gear.

2. The helical gear self-rotating ejection mechanism according to claim 1, characterized in that: It also includes a filling block (5), which is inserted from the second end of the rotating mold core (1) to form the mold cavity (11) at the first end of the rotating mold core (1).

3. The helical gear self-rotating ejection mechanism according to claim 2, characterized in that: It also includes an inner column (6), which is fixed in the cavity (11) to form the inner ring of the helical gear.

4. The helical gear self-rotating ejection mechanism according to claim 3, characterized in that: The push rods (4) include four push rods (4), and the four push rods (4) are arranged in a ring shape on the outer periphery of the inner column (6).

5. A helical gear self-rotating ejection mold, characterized in that: It comprises two sets of helical gear self-rotating ejection mechanisms as described in any one of claims 1 to 4.

6. The helical gear self-rotating ejection mold according to claim 5, characterized in that: The first end of the rotating mold core (1) is provided with a pressure ring (7), and the pressure ring (7) presses the ball bearing (3) into the mold body, and the pressure ring (7) is loosely matched with the outer ring of the rotating mold core (1).

7. The helical gear self-rotating ejection mold according to claim 5, characterized in that: It comprises an injection channel (8), wherein the injection channel (8) is formed in the mold body, and one end port of the injection channel (8) is arranged at the finished product ejection end of the mold cavity (11).

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