Balanced ejection device for back-off mold

Abstract

The utility model discloses a balance ejection device for a back-off mold, and relates to the technical field of mold ejection. The rear mold structure comprises a rear mold insert, a balance ejection rod is arranged in the middle of the rear mold insert in a sliding mode, a balance ejection insert is detachably installed at one end of the balance ejection rod and is of a conical structure, a conical groove is formed in one end of the rear mold insert, and the balance ejection insert vertically corresponds to the conical groove. According to the utility model, the balance ejection insert and the inner inverted plastic part are integrally formed in the mold cavity, so that when the inner inverted plastic part is ejected out, the balance ejection insert enables the ejection area of the inner inverted plastic part to be large, the ejected inner inverted plastic part is not easy to deform, and the inner inverted plastic part is well extracted when being ejected out; the balance ejection insert can ensure that the inner inverted buckle of the inner inverted buckle plastic part is not damaged, is convenient to process, can be matched with automatic equipment for use, realizes large-batch application, and effectively saves the cost.

Description

Technical Field

[0001] This utility model relates to the field of mold ejection technology, specifically a balanced ejection device for an undercut mold. Background Technology

[0002] Mold ejection refers to the process in which a mold ejects a product from its cavity during the molding process. Mold ejection is widely used in various fields of industrial production, mainly in the product molding process. For example, the ejection mechanism in an injection mold ejects the molded part from the cavity to achieve the purpose of producing injection molded products.

[0003] Currently, the undercut molds for products generally adopt internal telescopic design, which is costly and has significant limitations in processing shapes, making it difficult to achieve large-scale application. It also has disadvantages such as high processing difficulty and high cost. In addition, for the ejection of internally undercut plastic parts, the plastic parts are prone to deformation and damage. Utility Model Content

[0004] In order to solve the above problems, the purpose of this utility model is to provide a balanced ejection device for an undercut mold.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a balanced ejection device for an undercut mold, comprising a rear mold insert, wherein a balanced ejection rod is slidably provided in the middle of the rear mold insert, and a balanced ejection insert is detachably installed at one end of the balanced ejection rod. The balanced ejection insert has a conical structure, and a conical groove is provided at one end of the rear mold insert. The balanced ejection insert and the conical groove are vertically aligned.

[0006] Preferably, the other end of the rear mold insert has a plurality of No. 1 assembly holes arranged in a ring array.

[0007] Preferably, the end of the balance ejector rod away from the balance ejector insert has a second assembly hole.

[0008] Preferably, one end of the balance ejector rod is fixedly provided with a protruding rod, one end of the balance ejector insert is movably sleeved with the protruding rod, the protruding rod has a first threaded hole, one end of the balance ejector insert has a second threaded hole, a locking bolt is rotatably installed in the second threaded hole, the locking bolt passes through the first threaded hole and is rotatably connected to the first threaded hole.

[0009] Preferably, the interior of the rear mold insert has two slots, and the outer wall of the balance ejector rod is fixedly provided with two blocks, which are slidably connected to one end of the slots.

[0010] Preferably, the balanced ejector insert is made of S136 material.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] In this invention, a balanced ejection insert is integrally formed with the inner undercut plastic part within the mold cavity. During the ejection of the inner undercut plastic part, the balanced ejection insert ensures a large ejection area, preventing deformation of the ejected inner undercut plastic part and facilitating easy extraction. The balanced ejection insert also ensures that the inner undercut of the inner undercut plastic part is not damaged. The invention is easy to process, can be used with automated equipment, enables mass production, and effectively saves costs. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of the overall structure of a balanced ejection device for an undercut mold according to the present invention.

[0015] Figure 2 This is another overall structural diagram of a balanced ejection device for an undercut mold according to the present invention.

[0016] Figure 3 This is a cross-section of the rear mold insert of this utility model and a schematic diagram showing the separation of the balance ejector insert and the balance ejector rod.

[0017] Figure 4 This is a schematic diagram showing the connection between the balanced ejector insert and the inner undercut plastic part in an embodiment of this utility model.

[0018] Figure 5 This is a schematic diagram of the structure of the inverted plastic part in an embodiment of this utility model.

[0019] In the diagram: 1. Rear mold insert; 2. Ejector rod; 3. Ejector insert; 4. Inner undercut plastic part; 11. Conical groove; 21. Assembly hole 1; 22. Assembly hole 2; 23. Protruding rod; 24. Threaded hole 1; 25. Locking bolt; 26. Slot; 27. Locking block; 31. Threaded hole 2. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example: Figure 1-5 As shown, this utility model provides a balanced ejection device for undercut molds, including a rear mold insert 1. A balanced ejection rod 2 is slidably provided in the middle of the rear mold insert 1. A balanced ejection insert 3 is detachably installed at one end of the balanced ejection rod 2. The balanced ejection insert 3 is made of S136 material. Through the balanced ejection insert 3 made of S136 material, injection molding can be carried out without contamination of the internal undercut plastic part 4. When the rear mold insert 1 is assembled inside the lower mold, the balanced ejection insert 3 is located in the mold cavity of the lower mold. The bottom end of the balanced ejection rod 2 is assembled on the ejector plate (the ejector plate is located inside the lower mold). When the ejector rod on the injection molding machine moves (each injection molding machine is equipped with a balanced ejection rod 2), the balanced ejection insert 3 is installed in the lower mold cavity. The ejector rod pushes the ejector plate in the lower mold, and the ejector plate pushes the balance ejector rod 2 to rise. The balance ejector rod 2 ejects the inner undercut plastic part 4 through the balance ejector insert 3. During the injection molding process of the plastic product, the injection plastic is sprayed into the mold cavity of the upper mold and the lower mold by the injection molding machine. After the injection plastic in the mold cavity is molded to form the inner undercut plastic part 4, the inner undercut plastic part 4 covers the outside of the balance ejector insert 3. The balance ejector insert 3 has a conical structure. One end of the rear mold insert 1 is provided with a conical groove 11. The balance ejector insert 3 and the conical groove 11 are vertically aligned. By setting the conical groove 11, the balance ejector insert 3 can be stored in the conical groove 11 after it descends.

[0022] The other end of the rear mold insert 1 is provided with a number of No. 1 assembly holes 21 arranged in a ring array. By setting the No. 1 assembly holes 21, it is convenient for the operator to assemble the rear mold insert 1 into the interior of the lower mold.

[0023] The end of the balance ejector rod 2 away from the balance ejector insert 3 has a second assembly hole 22. By setting the second assembly hole 22, it is convenient for the operator to assemble the bottom end of the balance ejector rod 2 onto the ejector plate.

[0024] One end of the balance ejector rod 2 is fixedly provided with a protruding rod 23. One end of the balance ejector insert 3 is movably connected to the protruding rod 23. A first threaded hole 24 is opened on the protruding rod 23. A second threaded hole 31 is opened on one end of the balance ejector insert 3. A locking bolt 25 is rotatably installed in the second threaded hole 31. The locking bolt 25 passes through the first threaded hole 24 and is rotatably connected to the first threaded hole 24. By setting the protruding rod 23, the first threaded hole 24, the second threaded hole 31 and the locking bolt 25, it is convenient to assemble the balance ejector insert 3 on the upper end of the balance ejector rod 2. At the same time, the balance ejector insert 3 at the upper end of the balance ejector rod 2 can be removed.

[0025] The rear mold insert 1 has two slots 26 inside, and the outer wall of the balance ejector rod 2 is fixedly provided with two blocks 27. The blocks 27 are slidably connected to one end of the slots 26. By setting the slots 26 and the blocks 27, the blocks 27 can slide vertically along the inner wall of the slots 26, thereby keeping the balance ejector rod 2 in a vertical direction for raising and lowering.

[0026] Working principle: When this balanced ejection device is in use, the rear mold insert 1 is assembled into the interior of the lower mold through the first assembly hole 21, and at the same time, the bottom end of the balanced ejection rod 2 is assembled into the ejector plate inside the lower mold through the second assembly hole 22.

[0027] Subsequently, the upper mold and the lower mold are closed. When the injection plastic is sprayed into the mold cavity of the upper mold and the lower mold by the injection molding machine, as the injection plastic is formed, the injection plastic forms an inner undercut plastic part 4 in the mold cavity of the upper mold and the lower mold, and the inner undercut plastic part 4 covers the outside of the balance ejector insert 3.

[0028] When the ejector rod on the injection molding machine moves, it pushes the ejector plate inside the mold. The ejector plate then pushes the balance ejector rod 2 upward. The balance ejector rod 2 ejects the inner undercut plastic part 4 through the balance ejector insert 3, thus facilitating the ejection of the inner undercut plastic part 4. The balance ejector insert 3 provides a large ejection area for the inner undercut plastic part 4, preventing deformation and ensuring proper extraction during ejection. The balance ejector insert 3 also ensures that the inner undercut of the inner undercut plastic part 4 is not damaged. It is easy to process, can be used with automated equipment, enables mass production, and effectively saves costs.

[0029] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A balanced ejection device for an undercut mold, comprising a rear mold insert (1), characterized in that: The rear mold insert (1) has a sliding balance ejector rod (2) in the middle. One end of the balance ejector rod (2) is detachably fitted with a balance ejector insert (3). The balance ejector insert (3) has a conical structure. One end of the rear mold insert (1) has a conical groove (11). The balance ejector insert (3) and the conical groove (11) are vertically aligned.

2. The balanced ejection device for an undercut mold as described in claim 1, characterized in that, The other end of the rear mold insert (1) is provided with a plurality of No. 1 assembly holes (21) arranged in a ring array.

3. The balanced ejection device for an undercut mold as described in claim 1, characterized in that, The end of the balance ejector rod (2) away from the balance ejector insert (3) has a No. 2 assembly hole (22).

4. A balanced ejection device for an undercut mold as described in claim 1, characterized in that, One end of the balance ejector rod (2) is fixedly provided with a protruding rod (23), and one end of the balance ejector insert (3) is movably sleeved with the protruding rod (23). A first threaded hole (24) is opened on the protruding rod (23), and a second threaded hole (31) is opened on one end of the balance ejector insert (3). A locking bolt (25) is rotatably installed in the second threaded hole (31). The locking bolt (25) passes through the first threaded hole (24) and is rotatably connected to the first threaded hole (24) by threads.

5. A balanced ejection device for an undercut mold as described in claim 1, characterized in that, The rear mold insert (1) has two slots (26) inside, and the outer wall of the balance ejector rod (2) is fixedly provided with two blocks (27), and the blocks (27) are slidably connected to one end of the slots (26).

6. A balanced ejection device for an undercut mold as described in claim 1, characterized in that, The balanced ejector insert (3) is made of S136 material.

Images