Injection mold for secondarily ejecting injection product

Abstract

The utility model discloses an injection mold for secondarily ejecting an injection product, which comprises a lower mold plate, a lower mold core arranged in the lower mold plate, a lower mold insert arranged in the lower mold core, a notch part arranged at the lower part of the lower mold core, a step part arranged at the lower part of the lower mold insert and positioned in the notch part, a gap is formed between the upper surface of the step part and the upper surface of the notch part, an upper ejector plate is arranged below the lower mold plate, a lower ejector plate is arranged below the upper ejector plate, a first T-shaped groove is formed in the lower ejector plate, a limiting pull rod is vertically arranged on the lower mold insert, and a first protruding part at the lower end of the limiting pull rod is located in the first T-shaped groove; an ejector pin is vertically arranged on the upper ejector pin plate, a second T-shaped groove is formed in the upper ejector pin plate, a second protruding part at the lower end of the ejector pin is located in the second T-shaped groove, and the upper end of the ejector pin penetrates through the lower die plate, the lower die core and the lower die insert. According to the injection mold for secondary ejection of the injection product, the stress is small during mold opening and ejection of the product, and the product cannot be damaged during ejection.

Description

Technical Field

[0001] This utility model relates to an injection mold for secondary ejection injection molding products, belonging to the field of injection molding product production mold technology. Background Technology

[0002] Many plastic products are manufactured using injection molds. The product is formed by injection molding, and after the product is formed, the mold needs to be opened to remove the product. However, for some products with many structural features, the product is subjected to a large clamping force of the mold when the product is ejected after injection molding. If the product cannot be demolded normally or is forced to be demolded, it may damage the product. Therefore, it is necessary to consider the reasonable design of the mold structure to facilitate the ejection of the injection molded product and not damage the product. Utility Model Content

[0003] The main technical problem solved by this utility model is to provide an injection mold for secondary ejection injection molding products. The product is subjected to less force when the mold is opened and ejected, so the product will not be damaged during ejection.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An injection mold for secondary ejection injection molding products is provided, including a lower mold plate, a lower mold core disposed within the lower mold plate, a lower mold insert that can float vertically disposed within the lower mold core, a notch disposed on the lower part of the lower mold core near the lower mold insert, a horizontally protruding step disposed on the lower part of the lower mold insert near the lower mold core, the step being located within the notch, a gap existing between the upper surface of the step and the upper surface of the notch, an upper ejector plate disposed below the lower mold plate, and a lower ejector plate disposed below the upper ejector plate. The lower ejector plate is provided with a first T-slot. A limiting rod is vertically provided on the lower mold insert. The limiting rod passes through the upper ejector plate and the lower ejector plate. The lower end of the limiting rod is provided with a first protrusion that protrudes horizontally and radially. The first protrusion is located in the first T-slot. The upper end of the limiting rod is fixedly connected to the lower mold insert. An ejector pin is vertically provided on the upper ejector plate. The upper ejector plate is provided with a second T-slot. The lower end of the ejector pin is provided with a second protrusion that protrudes horizontally and radially. The second protrusion is located in the second T-slot. The upper end of the ejector pin passes through the lower mold plate, the lower mold core, and the lower mold insert.

[0005] Preferably, the upper outer circumferential surface of the limiting rod is provided with an external thread, the lower mold insert is provided with a threaded hole, and the upper end of the limiting rod is connected to the lower mold insert by a thread.

[0006] Preferably, when the lower mold insert is in its lowest position within the lower mold plate, the upper end face of the ejector pin is flush with the top surface of the lower mold core and the lower mold insert.

[0007] Preferably, the gap between the upper surface of the stepped portion and the upper surface of the notch portion is 3-8 mm.

[0008] The beneficial effects of this utility model are as follows: After the product is injection molded, the injection mold of this utility model first ejects a small amount of the product to release some of the clamping force on the injection molded product before ejecting the product. The product will not be subjected to a large clamping force during the entire ejection process, which can avoid damage to the product due to the large force of direct ejection. The injection molded product meets the appearance and functional requirements. The mold ejection structure is a mechanical structure, which is simple and stable, can meet the requirements of long-term production, is not easy to be damaged, has low production cost, is simple to process, and is easy to maintain in the later stage. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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, wherein:

[0010] Figure 1 This is a schematic diagram of the injection mold for a secondary ejection injection molded product according to this utility model. Detailed Implementation

[0011] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0012] Please see Figure 1This utility model embodiment includes: an injection mold for a secondary ejection injection molded product, comprising a lower mold plate 1, a lower mold core 2 disposed within the lower mold plate 1, a lower mold insert 3 disposed within the lower mold core 2 that can float vertically, a notch 4 disposed on the lower part of the lower mold core 2 near the lower mold insert 3, a horizontally protruding step 5 disposed on the lower part of the lower mold insert 3 near the lower mold core 2, the step 5 being located within the notch 4, a gap 6 being formed between the upper surface of the step 5 and the upper surface of the notch 4, an upper ejector plate 7 disposed below the lower mold plate 1, a lower ejector plate 8 disposed below the upper ejector plate 7, and a first T-shaped part disposed on the lower ejector plate 8. The lower mold insert 3 is vertically provided with a limiting rod 10, which passes through the upper ejector plate 7 and the lower ejector plate 8. The lower end of the limiting rod 10 is provided with a first protrusion 11 that protrudes horizontally and radially, and the first protrusion 11 is located in the first T-groove 9. The upper end of the limiting rod 10 is fixedly connected to the lower mold insert 3. The upper ejector plate 7 is vertically provided with an ejector pin 12, and the upper ejector plate 7 is provided with a second T-groove 13. The lower end of the ejector pin 12 is provided with a second protrusion 14 that protrudes horizontally and radially, and the second protrusion 14 is located in the second T-groove 13. The upper end of the ejector pin 12 passes through the lower mold plate 1, the lower mold core 2, and the lower mold insert 3.

[0013] Preferably, the upper outer circumferential surface of the limiting rod 10 is provided with an external thread, the lower mold insert 3 is provided with a threaded hole, and the upper end of the limiting rod 10 is connected to the lower mold insert 3 by a thread.

[0014] Preferably, when the lower mold insert 3 is in its lowest position within the lower mold plate 1, the upper end face of the ejector pin 12 is flush with the top surface of the lower mold core 2 and the lower mold insert 3.

[0015] Preferably, the gap between the upper surface of the stepped portion 5 and the upper surface of the notch portion 4 is 3-8mm. This distance allows the product to be ejected easily, releasing some of the clamping force on the injection molded product without subjecting the product to excessive clamping force.

[0016] When the injection mold of the secondary ejection injection molding product of this utility model is working, the injection plastic is injected into the mold to form a shape. Then, the mold is prepared to open, and the upper mold part and the lower mold part are separated. Generally, the upper mold part moves upward. Then, the lower mold plate 1 and the lower mold core 2 are fixed. The lower ejector plate 8, the limiting tie rod 10, the upper ejector plate 7 and the ejector pin 12 move upward together. The limiting tie rod 10 pushes the lower mold insert 3 upward. During this upward movement, the ejector pin 12 and the lower mold insert 3 push the injection molded product 15 upward. When the lower mold insert 3 moves upward and the upper surface of the step 5 contacts the upper surface of the notch 4, the step 5 is blocked by the upper surface of the notch 4, and the lower mold insert 3 can no longer move upward. At this time, the injection molded product 15 is pushed upward a certain distance. This distance is equal to the gap distance between the upper surface of the step 5 and the upper surface of the notch 4. This is the first ejection of the injection molded product 15. The first ejection involves a relatively small ejection distance, but this initial ejection overcomes some of the clamping force of the mold on the injection molded product. Then, the lower mold insert 3 is fixed in place by the lower mold core 2, and the limit rod 10 is also fixed in place. The ejector pin 12, the upper ejector plate 7, and the lower ejector plate 8 continue to eject upwards for a certain distance. The injection molded product completely detaches from the lower mold core 2 and automatically falls or is grabbed by the robot arm, completing the mold opening and material removal action. The injection molded product is ejected from the lower mold in two steps and two stages. The injection molded product is not subjected to a large clamping force during the entire ejection process, which can avoid damage to the product due to the large force of direct ejection. The injection molded product meets the appearance and functional requirements. The mold ejection structure is a mechanical structure, which is simple and stable, can meet the requirements of long-term production, is not easily damaged, has low production costs, is simple to process, and is easy to maintain later.

[0017] When the mold is closed, the upper ejector plate 7 and the lower ejector plate 8 move down, causing the limit rod 10 to return to its original position. The lower mold insert 3 returns to its original position, and the mold can begin to close and start the next injection molding action.

[0018] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An injection mold for a secondary ejection injection molded product, comprising a lower mold plate, wherein a lower mold core is disposed within the lower mold plate, characterized in that, The lower mold core is provided with a lower mold insert that can float up and down. A notch is provided on the lower part of the lower mold core near the lower mold insert. A horizontally protruding step is provided on the lower part of the lower mold insert near the lower mold core. The step is located within the notch. A gap exists between the upper surface of the step and the upper surface of the notch. An upper ejector plate is provided below the lower mold plate, and a lower ejector plate is provided below the upper ejector plate. A first T-slot is provided on the lower ejector plate. A limit position is vertically provided on the lower mold insert. A tie rod, wherein the limiting tie rod passes through the upper ejector plate and the lower ejector plate, and the lower end of the limiting tie rod is provided with a first protrusion protruding horizontally in the radial direction, the first protrusion being located in a first T-slot. The upper end of the limiting tie rod is fixedly connected to the lower mold insert. An ejector pin is vertically provided on the upper ejector plate, and a second T-slot is provided on the upper ejector plate. The lower end of the ejector pin is provided with a second protrusion protruding horizontally in the radial direction, the second protrusion being located in a second T-slot. The upper end of the ejector pin passes through the lower mold plate, the lower mold core, and the lower mold insert.

2. The injection mold for secondary ejection injection molded products according to claim 1, characterized in that, The upper outer circumferential surface of the limiting rod is provided with an external thread, and the lower mold insert is provided with a threaded hole. The upper end of the limiting rod is connected to the lower mold insert by a thread.

3. The injection mold for secondary ejection injection molded products according to claim 2, characterized in that, When the lower mold insert is in its lowest position within the lower mold plate, the upper end face of the ejector pin is flush with the top surface of the lower mold core and the lower mold insert.

4. The injection mold for secondary ejection injection molded products according to claim 3, characterized in that, The gap between the upper surface of the stepped portion and the upper surface of the notch portion is 3-8mm.

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