Tooth core transmission stroke positioning structure of tooth twisting mold

Abstract

The utility model discloses a thread core transmission stroke positioning structure of a thread twisting mold, and relates to the technical field of plastic mold product manufacturing, in particular to a thread core transmission stroke positioning structure of a thread twisting mold, which is a plastic product with internal threads and needs thread twisting and demolding after the product is molded by the mold. The die mainly comprises an upper die, a lower die, a transmission chain group and a new tooth core, the upper die and the lower die are buckled to form a cavity for forming an internal thread product, the new tooth core stands in the cavity, the bottom end of the new tooth core is in threaded connection with a threaded tooth sleeve fixed on a bottom plate of the lower die, and the new tooth core is in transmission connection with the transmission chain group through a driven gear fixed on the new tooth core; the middle section of the new tooth core is provided with a boss; the diameter of the boss is greater than the aperture of a mold core of the lower mold; due to the fact that advancing and retreating of a thread core part are designed and positioned, the service life of the thread core part is guaranteed, and stable production of the die is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic mold product manufacturing, in particular to a plastic product with internal thread, that is, a thread-thread mold core transmission stroke positioning structure of the product which needs thread-thread demoulding after the mold is formed. Background Art

[0002] Threaded connection is a very common way to connect two parts into a whole in our work and life. In the production of plastic products, parts with internal threads are everywhere, such as the following Figures 1 to 5 The internal thread product 1 shown in the figure needs to be demolded through the teeth 21 on the thread core 2 after being formed in the upper mold 3 and the lower mold 4, so as to form the internal thread 11 on the internal thread product 1; the traditional thread twisting structure is that the oil cylinder and the cylinder drive the gear 5, and then the driven wheel 51 fixed on the thread core 2 drives the thread core 2 to perform a spiral up and down thread twisting action around the sleeve 411 fixed on the base plate 41.

[0003] The existing threaded tooth structure mold does not have a transmission stroke positioning for the thread core 2, that is, the forward and backward movement of the thread core 2 is not fixed; if the thread core 2 is not limited in forward movement, the top of the internal thread product 1 will be damaged, which will directly lead to defective plastic products; if the thread core 2 is not limited in backward movement, the original position will not be found after the mold is assembled and disassembled, resulting in the multi-hole internal thread product 1 being out of sync. Summary of the invention

[0004] The utility model aims to overcome the defects of the prior art and provide a tooth core transmission stroke positioning structure for a thread twisting die.

[0005] The utility model adopts the following technical solutions:

[0006] The thread core transmission stroke positioning structure of the thread-twisting die is mainly composed of an upper die, a lower die, a transmission chain group and a new thread core. The upper die and the lower die are buckled together to form a cavity for forming an internal thread product. The new thread core stands in the cavity, and its bottom end is threadedly connected with a threaded sleeve fixed on the bottom plate of the lower die. The new thread core is transmission-connected with the transmission chain group through a driven gear fixed thereon; a boss is provided in the middle section of the new thread core, and the diameter of the boss is larger than the aperture of the mold core of the lower die; a limit column is threadedly connected on the bottom plate of the lower die, and the limit column is located in the hollow threaded sleeve;

[0007] The boss of the new tooth core is located at the bottom of the backing plate of the mold core of the lower mold 4;

[0008] The limiting column is located at the bottom of the new tooth core.

[0009] The utility model positions the forward and backward movement of the tooth core parts, thereby ensuring the service life of the tooth core parts and stable production of the mold; and the mold assembly and disassembly consistency is good, which shortens the mold assembly time, ensures product quality, improves production efficiency, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 A three-dimensional image of the processed product;

[0011] Attached Figure 2 It is a three-dimensional image of the processed product from another perspective;

[0012] Attached Figure 3 It is a three-dimensional image of the existing tooth core;

[0013] Attached Figure 4 It is a cross-sectional view of the prior art;

[0014] Attached Figure 5 For attachment Figure 4 A partial enlarged view;

[0015] Attached Figure 6 It is a cross-sectional view of the utility model;

[0016] Attached Figure 7 This is a cross-sectional view of the utility model rotated 90 degrees;

[0017] Attached Figure 8 For attachment Figure 6 A is the enlarged picture;

[0018] Attached Fig. 9 For attachment Figure 6 Enlarged view of point B. DETAILED DESCRIPTION

[0019] See attached Figures 6 to 9 The thread-threading die core transmission stroke positioning structure is mainly composed of an upper die 3, a lower die 4, a transmission chain group 5 and a new thread core 6. The upper die 3 and the lower die 4 are buckled together to form a cavity for forming an internal thread product 1. The new thread core 6 stands in the cavity, and its bottom end is threadedly connected to a threaded sleeve 411 fixed on the bottom plate 41 of the lower die. The new thread core 6 is connected to the transmission chain group 5 through a driven gear 51 fixed thereon; a boss 63 is provided in the middle section of the new thread core 6, and the diameter of the boss 63 is larger than the aperture of the mold core 42 of the lower die 4; a limiting column 7 is threadedly connected to the bottom plate 41 of the lower die, and the limiting column 7 is located in the hollow threaded sleeve 411;

[0020] The boss 63 of the new tooth core 6 is located at the bottom of the pad of the mold core 42 of the lower mold 4;

[0021] The limiting column 7 is located at the bottom of the new tooth core 6 .

[0022] When the utility model is applied, after the upper mold 3 and the lower mold 4 are buckled together to form the cavity of the molded internal thread product 1 and the injection molding is completed, the transmission chain group 5 is started, the transmission chain drives the driven gear 51 to rotate, and the new thread core 6 is rotated and lowered on the threaded sleeve 411 on the bottom plate 41 of the lower mold. When it is lowered to a set height, the bottom of the new thread core 6 is pressed against the top of the limit column 7, and the lowering height of the new thread core 6 is limited;

[0023] Similarly, when the new tooth core 6 rises to the set height, the boss 63 of the new tooth core 6 abuts against the bottom of the pad of the mold core 42 of the lower mold 4, and the rising height of the new tooth core 6 is limited.

[0024] The stroke of the new tooth core 6 can be adjusted by adjusting the height of the limiting column 7 threadedly connected to the bottom plate 41 of the lower mold.

Claims

1. The thread core transmission stroke positioning structure of the thread twisting die is mainly composed of an upper die, a lower die, a transmission chain group and a new thread core. The upper die and the lower die are buckled together to form a cavity for forming an internal thread product. The new thread core stands in the cavity, and its bottom end is threadedly connected to the thread sleeve fixed on the bottom plate of the lower die. The new thread core is connected to the transmission chain group through a driven gear fixed thereon, and is characterized in that: A boss is arranged in the middle section of the new tooth core, and the diameter of the boss is larger than the aperture of the mold core of the lower mold; a limiting column is threadedly connected on the bottom plate of the lower mold, and the limiting column is located in the hollow threaded tooth sleeve.

2. The thread-twisting die core transmission stroke positioning structure according to claim 1, characterized in that: The boss of the new tooth core is located at the bottom of the pad of the mold core of the lower mold.

3. The thread-twisting die core transmission stroke positioning structure according to claim 1, characterized in that: The limiting column is located at the bottom of the new tooth core.

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