A demolding structure of an inner-pulling inclined ejector
By using the sliding body with an inclined ejector structure and the linkage design of the sliding body and the inclined ejector driven by the hydraulic cylinder, the problem of demolding difficulties for complex products is solved, achieving stable and reliable demolding and improving product quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN HUIJING PLASTIC PROD CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional slide and angled ejector demolding structures are difficult to completely release the undercut when dealing with complex products, resulting in product tearing or deformation. When the internal rib structure is complex, inserts are prone to adhesion, making demolding difficult.
The system adopts an internal sliding and inclined ejector structure, using a hydraulic cylinder to drive the sliding seat movement. Combined with the linkage design of the ejector plate, springs, and multiple sets of inclined ejectors, it achieves synchronous demolding of complex undercuts and inner ribs. Through the synergistic effect of the inclined ejectors and the ejector plate, it solves the problems of uneven demolding force distribution and unstable movement.
It improves the demolding performance and reliability of molds, avoids product sticking and damage, enhances product molding accuracy and surface quality, simplifies mold maintenance, extends service life, improves production efficiency and reduces costs.
Smart Images
Figure CN224348305U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, specifically to a demolding structure for an internal sliding ejector. Background Technology
[0002] Currently, in the injection mold industry, to address the demolding challenges of products with complex structures, a combination of sliding mechanisms and angled ejector mechanisms is commonly used to achieve smooth demolding. Sliding mechanisms are primarily used to handle undercut structures on the outer side of the product, while angled ejector mechanisms handle undercuts or ribbed structures on the inner side. This combination is widely used in the production of automotive parts, electronic device housings, and precision plastic products, effectively improving product molding quality and production efficiency.
[0003] However, in actual production, when the product structure is complex, with many undercuts and dense internal ribs, traditional slide and angled ejector demolding structures often fail to meet the requirements. Specifically, on the one hand, the product has many undercuts, and conventional slides cannot completely eject the product, which can easily lead to product tearing or deformation; on the other hand, the internal rib structure of the product is complex, and inserts are needed to enhance venting and ejection, but inserts are prone to sticking to the slides, causing demolding difficulties and even damaging the product.
[0004] Therefore, a demolding structure with an inward-pulling inclined ejector is proposed here. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a demolding structure with an inner inclined ejector, which has the advantages of compact structure, stable and reliable demolding, effective prevention of product sticking to the mold, and improved product quality and production efficiency. It solves the problems of multiple undercuts, difficult demolding, easy sticking of inner ribs to the slide, and easy tearing and deformation of products in existing technologies.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a demolding structure with an inner sliding and inclined ejector, including a base, a rear mold core and a demolding assembly being provided on the top of the base, and a mold product being embedded inside the rear mold core;
[0007] The demolding assembly includes a slide addition seat embedded in the top of the base. A hydraulic cylinder is fixedly installed inside the slide addition seat. A primary slide pressure block is installed inside the slide addition seat. A slide seat is slidably installed inside the primary slide pressure block. The slide seat is fixedly connected to the output end of the hydraulic cylinder. A primary slide insert is embedded between the mold product and the slide seat. An ejector plate is installed inside the slide seat. Several sets of springs are fixedly installed on the side of the ejector plate away from the primary slide insert for secondary oblique ejection. An inclined ejector is fixedly installed on the side of the ejector plate close to the primary slide insert.
[0008] Furthermore, the interior of the rear mold core is provided with a mold cavity, and the mold product is disposed inside the mold cavity.
[0009] Furthermore, the interior of the positioning seat is provided with an ejection cavity for the ejector plate to slide, and the ejector plate is disposed inside the ejection cavity.
[0010] Furthermore, several sets of the springs are evenly distributed on the side of the ejector plate away from the primary positioning insert.
[0011] Furthermore, the number of the inclined tops is eleven, and the length of the inclined tops is greater than the thickness of the first row insert.
[0012] Furthermore, the interior of the primary positioning insert has eleven sets of top holes, and the positions of the eleven sets of top holes correspond one-to-one with the positions of the eleven sets of inclined tops.
[0013] Furthermore, two sets of nylon plugs are symmetrically arranged between the ejector plate and the primary positioning insert on the side that are close to each other, and both sets of nylon plugs are cylindrical in shape.
[0014] Furthermore, two sets of blocks are provided between the ejector plate and the primary positioning insert on the side that are close to each other, and the cross-sectional shape of the two sets of blocks is L-shaped.
[0015] Furthermore, both sets of the stop blocks have connecting holes inside, and the two sets of stop blocks are respectively sleeved on the outside of the two sets of nylon plugs through the connecting holes.
[0016] Furthermore, the cross-sectional shape of the primary positioning block is set to U-shape, and the distance between the inner walls of the front and rear sides of the primary positioning block is equal to the length of the positioning seat.
[0017] Compared with the prior art, the technical solution of this application has the following beneficial effects:
[0018] 1. The demolding structure with an internal inclined ejector uses a hydraulic cylinder to drive the movement of the slide seat. In conjunction with the internal ejector plate, springs, and inclined ejectors, it achieves synchronous demolding of complex undercuts and inner ribs of the product. At the same time, by setting up a linkage mechanism between multiple sets of inclined ejectors and ejector plates, it effectively solves the problems of uneven demolding force distribution and unstable movement in traditional structures, and significantly improves the overall demolding performance and reliability of the mold.
[0019] 2. The demolding structure with an internally drawn inclined ejector effectively overcomes the defects of existing technologies, such as multiple undercuts, difficulty in demolding, easy sticking of the inner ribs to the slide, and easy tearing and deformation of the product. Through the synergistic effect of the internally drawn inclined ejector and the slide mechanism, it not only avoids the problem of product sticking and damage during demolding, but also improves the molding accuracy and surface quality of the product. At the same time, this structure simplifies the mold maintenance and debugging process, extends the mold service life, thereby improving production efficiency and reducing manufacturing costs. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective;
[0022] Figure 3 This is a schematic diagram of the demolding component of this utility model;
[0023] Figure 4 This is a partial structural diagram of the demolding component of this utility model;
[0024] Figure 5 This is a schematic diagram of a partial structure of the demolding component of this utility model from another perspective;
[0025] Figure 6 This is a schematic diagram showing the connection between the demolding component and the mold product of this utility model.
[0026] In the diagram: 1. Base; 2. Rear mold core; 21. Mold product; 3. Demolding component; 31. Slide addition seat; 32. Hydraulic cylinder; 33. Primary slide pressure block; 34. Slide seat; 35. Primary slide insert; 36. Ejector plate; 37. Spring; 38. Angled ejector; 39. Nylon plug; 310. Stop block. Detailed Implementation
[0027] 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.
[0028] Please see Figure 1-6 The demolding structure of the sliding inner inclined ejector in this embodiment includes a base 1, a rear mold core 2 and a demolding component 3 are provided on the top of the base 1, and a mold product 21 is embedded inside the rear mold core 2.
[0029] It should be noted that mold product 21 is a product that requires demolding. It is injection molded by the cooperation of the rear mold core 2 and the mold. Mold product 21 has several undercuts.
[0030] In this embodiment, the demolding assembly 3 includes a slide addition seat 31 embedded in the top of the base 1. A hydraulic cylinder 32 is fixedly installed inside the slide addition seat 31. A primary slide pressure block 33 is installed inside the slide addition seat 31. A slide seat 34 is slidably installed inside the primary slide pressure block 33. The slide seat 34 is fixedly connected to the output end of the hydraulic cylinder 32. A primary slide insert 35 is embedded between the mold product 21 and the slide seat 34. An ejector plate 36 is installed inside the slide seat 34. Several sets of springs 37 are fixedly installed on the side of the ejector plate 36 away from the primary slide insert 35 for secondary oblique ejection. An oblique ejector 38 is fixedly installed on the side of the ejector plate 36 close to the primary slide insert 35.
[0031] It should be noted that the primary slide insert 35 is a detachable insert installed between the slide base 34 and the mold product 21. It is usually made of high-strength steel and embedded in the slide structure. It participates in the molding of complex structures on the outside of the product, especially parts with undercuts or side recesses. During the mold opening process, it moves together with the primary slide base 34 to help the product get out of the mold. In addition, through its internal top hole, it cooperates with the inclined ejector 38 to ensure that the inclined ejector 38 moves accurately and stably.
[0032] In this embodiment, the interior of the rear mold core 2 is provided with a mold cavity, and the mold product 21 is disposed inside the mold cavity.
[0033] Specifically, the rear mold core 2 is the core molding component fixed on the base 1 in the injection mold. It is usually located in the rear mold part of the mold and is used to form the inner surface or complex structure of the product, as well as the internal shape, ribs, and other structures of the product. At the same time, it provides accurate positioning for the mold product 21 and ensures the dimensional accuracy of the product.
[0034] In this embodiment, the interior of the row seat 34 is provided with an ejection cavity for the ejector plate 36 to slide, and the ejector plate 36 is disposed inside the ejection cavity.
[0035] In this embodiment, several sets of springs 37 are evenly distributed on the side of the ejector plate 36 away from the primary moving insert 35.
[0036] In this embodiment, there are eleven sets of inclined tops 38, and the length of the inclined tops 38 is greater than the thickness of the first row insert 35.
[0037] Specifically, the angled ejector 38 is an ejection structure with an inclined angle, installed on the ejector plate 36, passing through the top hole on the primary slide insert 35, and contacting the molded product 21. It is used to eject the undercut, groove or rib structure on the inner side of the product, avoiding product sticking to the mold. During the demolding process, the angled ejector 38 not only plays a demolding role, but also applies ejection force to the product, helping the product to smoothly leave the mold. Secondly, the angled ejector 38 has a certain inclination angle, so that it gradually separates from the product during the movement, avoiding damage to the product caused by forced demolding.
[0038] In this embodiment, the interior of the primary positioning insert 35 is provided with eleven sets of top holes, and the positions of the eleven sets of top holes correspond one-to-one with the positions of the eleven sets of inclined tops 38.
[0039] In this embodiment, two sets of nylon plugs 39 are symmetrically arranged between the ejector plate 36 and the primary moving insert 35 on their respective sides, and both sets of nylon plugs 39 are cylindrical in shape.
[0040] In this embodiment, two sets of blocks 310 are provided between the ejector plate 36 and the primary positioning insert 35 on the side that are close to each other, and the cross-sectional shape of the two sets of blocks 310 is L-shaped.
[0041] In this embodiment, both sets of stop blocks 310 have connecting holes inside, and the two sets of stop blocks 310 are respectively sleeved on the outside of the two sets of nylon rubber plugs 39 through the connecting holes.
[0042] In this embodiment, the cross-sectional shape of the primary positioning block 33 is set to U-shape, and the distance between the inner walls of the front and rear sides of the primary positioning block 33 is equal to the length of the positioning seat 34.
[0043] In summary, by driving the slide seat 34 to move through the hydraulic cylinder 32, and coordinating the design of the ejector plate 36 and the inclined ejector 38, the staged and stable demolding of complex products with undercut and rib structures is achieved. The spring 37, nylon plug 39 and stop block 310 jointly control the movement rhythm of the ejector plate 36, ensuring a smooth and reliable demolding process, avoiding product damage, and improving the automation level and production efficiency of the mold.
[0044] The working principle of the above embodiments is as follows:
[0045] (1) When in the mold closed state, i.e. the initial state: Before injection molding, the mold is in the mold closed state, the oil cylinder 32 is in the contracted state, the slide seat 34 is located inside the primary slide pressure block 33, the ejector plate 36 is in close contact with the primary slide insert 35 under the action of the spring 37 and the nylon plug 39, the inclined ejector 38 passes through the top hole on the primary slide insert 35 and contacts the mold product 21, playing a supporting and forming role, and the stop block 310 restricts the stroke of the ejector plate 36 to prevent it from moving excessively.
[0046] (2) When in the mold opening process: First step: The first slide opens the mold by 20mm, the oil cylinder 32 starts, and pushes the slide seat 34 to move outward by 20mm; the slide seat 34 drives the first slide insert 35 to move synchronously. At this time, the ejector plate 36 remains stationary under the action of the spring 37 and the nylon plug 39, and the inclined ejector 38 moves relative to the mold product 21 and begins to disengage from the undercut part of the product, realizing the first demolding; Second step: The second slide opens the mold and continues to move by 50mm, with a total stroke of 70mm. The oil cylinder 32 continues to push the slide seat 34 to move, and the total stroke reaches 70mm. The slide seat 34 is fully opened, the inclined ejector 38 is completely disengaged from the mold product 21, and the ejector plate 36 remains stationary under the restriction of the stop block 310. The mold product 21 is successfully demolded under the synergistic action of the inclined ejector 38 and the first slide insert 35.
[0047] (3) When in the mold closing process, i.e. the reset action: First step: the slide seat 34 moves back 70mm, the oil cylinder 32 moves in the opposite direction, pulling the slide seat 34 back, the slide seat 34 drives the primary slide insert 35 to return synchronously, the ejector plate 36 remains stationary under the restriction of the stop block 310, the inclined ejector 38 gradually approaches the mold product 21, ready to reset; Second step: the slide seat 34 is fully closed and continues to move to the mold closing state, the slide seat 34 continues to return to the fully closed state, the ejector plate 36 is reset under the action of the spring 37 and the nylon plug 39, the inclined ejector 38 is re-inserted into the top hole of the primary slide insert 35, returning to the mold closing state, ready for the next injection.
[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0049] If this patent discloses or relates to components or structural parts that are fixedly connected to each other, then unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured by casting) (except where it is obviously impossible to use an integral forming process).
[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A demolding structure for an internal sliding ejector with an inclined top, characterized in that: Includes a base, the top of which is provided with a rear mold core and a demolding assembly, and the mold product is embedded inside the rear mold core; The demolding assembly includes a slide addition seat embedded in the top of the base. A hydraulic cylinder is fixedly installed inside the slide addition seat. A primary slide pressure block is installed inside the slide addition seat. A slide seat is slidably installed inside the primary slide pressure block. The slide seat is fixedly connected to the output end of the hydraulic cylinder. A primary slide insert is embedded between the mold product and the slide seat. An ejector plate is installed inside the slide seat. Several sets of springs are fixedly installed on the side of the ejector plate away from the primary slide insert for secondary oblique ejection. An inclined ejector is fixedly installed on the side of the ejector plate close to the primary slide insert.
2. The demolding structure for an inwardly angled ejector pin according to claim 1, characterized in that: The rear mold core has a mold cavity inside, and the mold product is placed inside the mold cavity.
3. The demolding structure for an inwardly angled ejector pin according to claim 2, characterized in that: The interior of the row seat has an ejection cavity for the ejector plate to slide, and the ejector plate is disposed inside the ejection cavity.
4. The demolding structure for an inwardly angled ejector pin according to claim 3, characterized in that: Several sets of springs are evenly distributed on the side of the ejector plate away from the primary positioning insert.
5. The demolding structure for an inwardly angled ejector pin according to claim 4, characterized in that: The number of inclined tops is eleven, and the length of the inclined tops is greater than the thickness of the first row insert.
6. The demolding structure for an inward-pulling inclined ejector according to claim 5, characterized in that: The primary positioning insert has eleven sets of top holes inside, and the positions of the eleven sets of top holes correspond one-to-one with the positions of the eleven sets of inclined tops.
7. The demolding structure for an inwardly angled ejector pin according to claim 6, characterized in that: Two sets of nylon plugs are symmetrically arranged between the ejector plate and the primary positioning insert on their respective sides, and both sets of nylon plugs are cylindrical in shape.
8. The demolding structure for an inwardly angled ejector pin according to claim 7, characterized in that: Two sets of blocks are provided between the ejector plate and the primary positioning insert on the side that are close to each other, and the cross-sectional shape of the two sets of blocks is L-shaped.
9. A demolding structure for an inwardly angled ejector pin according to claim 8, characterized in that: Both sets of the stop blocks have connecting holes inside, and the two sets of stop blocks are respectively sleeved on the outside of the two sets of nylon rubber plugs through the connecting holes.
10. A demolding structure for an inwardly angled ejector pin according to claim 9, characterized in that: The cross-sectional shape of the primary positioning block is U-shaped, and the distance between the inner walls of the front and rear sides of the primary positioning block is equal to the length of the positioning seat.