A demolding structure of an injection mold

Abstract

The utility model provides a demoulding structure of injection mold belongs to injection mold technical field to solve the demoulding structure of injection mold of current injection mold, and the ejection element sealing piece is easy to age failure, and the slight failure of initial stage is inconvenient to detect, and the problem of influencing cavity pressure and forming effect. Including mold base, lower die seat, upper die seat, drive mechanism, transmission plate, detection ring, sealing assembly and detection assembly, the lower die seat bolt connection is in the upper portion of mold base, the upper die seat sliding connection is in the upper portion of lower die seat, the drive mechanism fixed mounting is in the bottom of mold base, transmission plate perpendicularity sliding connection is in the inside of mold base, transmission plate fixed mounting is in the top of drive mechanism, the detection ring fixed mounting is in the bottom of lower die seat, the sealing assembly sets up in the inside of mold base, the detection assembly sets up in the inside of mold base. The utility model has the advantages of strengthening sealing, failure detection, convenient to use and the like.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and more specifically, it relates to a demolding structure for injection molds. Background Technology

[0002] Injection molds are core equipment for the large-scale production of plastic products, and the demolding process directly determines product quality and production efficiency. Existing demolding structures and methods for injection molds include mechanical ejection and pneumatic assistance, with mechanical ejection being the most widely used. These structures utilize pneumatic or electric drive mechanisms to propel a demolding transmission plate along a preset trajectory. The transmission plate is equipped with multiple sets of ejector pins, ejector tubes, or ejector plates, depending on the shape, structural characteristics, and force requirements of the plastic part. These ejector elements push the cooled and solidified plastic part out of the mold cavity.

[0003] Existing application number CN202323480939.6 discloses a demolding structure inside an injection mold, including a lower mold base. An ejector plate is detachably mounted on the middle of the upper surface of the lower mold base. A top plate is detachably mounted on the upper surface of the ejector plate. Four moving mold guide pillars are detachably mounted in a rectangular array on the upper surface of the top plate. Four telescopic rods are detachably mounted in a rectangular array on the upper surface of the top plate. A buffer spring is fixedly sleeved on the outer surface of each telescopic rod. In this solution, the demolding structure uses a sealing ring. When injection molding is required inside the cavity, the injection plastic flows through the interior of the upper mold base and the fixed mold body into the cavity for injection molding. Because the demolding plate is fitted to the inner wall of the cavity through the sealing ring, and the sealing ring is made of rubber, gaps between the demolding plate surface and the inner wall of the cavity are avoided, preventing the injection plastic from flowing to the bottom of the cavity wall, thus reducing material loss.

[0004] Based on the above, when the demolding structure of the existing injection mold adopts a mechanical ejection structure, the ejector element needs to slide inside the mold to eject the plastic part formed inside the cavity. However, when the plastic material is injected and formed inside the cavity, it is necessary to ensure a seal in order to maintain the pressure required for the molding of the plastic part. The ejector element and the mold are mostly sealed together by a seal. However, when the seal is used for a long time, it is prone to aging, wear or deformation, which leads to failure of the sealing performance. When the seal fails slightly in the early stage, the cavity pressure will only fluctuate slightly, which is not convenient to detect in time through conventional inspection, thus affecting the molding effect. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a demolding structure for injection molds. This addresses the issue that existing demolding structures using mechanical ejection require ejector elements to slide inside the mold to eject the molded plastic part from the cavity. However, during the injection and molding of the plastic part inside the cavity, a seal is necessary to maintain the pressure required for molding. The ejector elements and the mold are typically sealed together using seals. However, these seals are prone to aging, wear, or deformation after prolonged use, leading to seal failure. Initial minor seal failure results in only slight fluctuations in cavity pressure, which are difficult to detect through routine testing, thus affecting the molding effect.

[0006] The purpose and effect of this utility model's demolding structure for injection molds are achieved through the following specific technical means: A demolding structure for an injection mold includes a mold base, a lower mold base, an upper mold base, a drive mechanism, a transmission plate, a detection ring, a sealing assembly, and a detection assembly. The lower mold base is bolted to the upper part of the mold base; the upper mold base is slidably connected to the upper part of the lower mold base; the drive mechanism is fixedly installed at the bottom of the mold base; the transmission plate is vertically slidably connected inside the mold base and fixedly installed at the top of the drive mechanism; the detection ring is fixedly installed at the bottom of the lower mold base; the sealing assembly is disposed inside the mold base; and the detection assembly is disposed inside the mold base.

[0007] Furthermore, the sealing assembly includes a demolding ejector pin and a dustproof ring. The demolding ejector pin is fixedly installed on the top of the transmission plate and slidably connected in a groove opened inside the lower mold base. The dustproof ring is fixedly installed on the bottom of the detection ring.

[0008] Furthermore, the sealing assembly also includes a sealing cavity, a sealing lip, and a sealing ring, wherein the sealing cavity is formed at the top of the detection ring; the sealing lip is fixedly installed on the inner ring at the top of the detection ring; and the sealing ring is fixedly installed on the outer ring at the top of the detection ring.

[0009] Furthermore, the sealing assembly also includes: through holes and a detection cavity, wherein the through holes are arranged in a circumferential array inside the sealing cavity; and the detection cavity is formed inside the detection ring.

[0010] Furthermore, the sealing assembly also includes a transmission piston, which is slidably connected inside the detection chamber.

[0011] Furthermore, the detection assembly includes an elastic element and a displacement sensor. One end of the elastic element is fixedly connected to the bottom of the detection chamber, and the other end of the elastic element is fixedly connected to the bottom of the transmission piston. The displacement sensor is fixedly installed at the bottom of the detection chamber, and the top of the displacement sensor is fixedly connected to the transmission piston.

[0012] Compared with the prior art, the present invention has the following beneficial effects: Firstly, this utility model has a sealing component that uses a dustproof ring to prevent external dust and debris from entering the mold. Together with the sealing ring and sealing lip, it forms a secondary sealing structure. This ensures the stability of the cavity sealing when the initial seal is working properly and prevents pressure leakage after the initial seal fails. At the same time, the transmission piston buffers the infiltration pressure, preventing the secondary sealing structure from being damaged by instantaneous high pressure and extending the service life of the sealing components.

[0013] Secondly, this invention has a detection component that maintains the initial sealing state of the transmission piston through an elastic element, ensuring the sealing reliability in the non-failure state; when the seal fails and pressure seeps in, the pressure pushes the transmission piston to move, triggering a displacement sensor to capture the displacement signal and transmit it to an external controller, thereby realizing timely early warning of seal failure.

[0014] This utility model has the advantages of enhanced sealing, failure detection, and ease of use. It not only strengthens the sealing guarantee during the demolding process, but also realizes the accurate monitoring of sealing failure, thus avoiding the impact of sealing failure of the demolding structure on the molding of plastic parts. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the demolding ejector pin structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the transmission plate structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the lower mold base structure of this utility model.

[0019] Figure 5 This is a schematic diagram of the detection ring structure of this utility model.

[0020] Figure 6 This is a schematic diagram of the internal structure of the detection ring of this utility model.

[0021] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Mold base; 2. Lower mold base; 3. Upper mold base; 4. Drive mechanism; 5. Transmission plate; 501. Ejector pin; 6. Detection ring; 601. Sealing cavity; 602. Sealing lip; 603. Sealing ring; 604. Through hole; 605. Detection cavity; 606. Transmission piston; 607. Elastic element; 608. Displacement sensor; 609. Dustproof ring. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] Example 1: As attached Figure 1 To be continued Figure 6 As shown: This utility model provides a demolding structure for an injection mold, including a mold base 1, a lower mold base 2, an upper mold base 3, a drive mechanism 4, a transmission plate 5, a detection ring 6, and a sealing assembly. The lower mold base 2 is bolted to the upper part of the mold base 1; the upper mold base 3 is slidably connected to the upper part of the lower mold base 2; the drive mechanism 4 is fixedly installed at the bottom of the mold base 1; the transmission plate 5 is vertically slidably connected inside the mold base 1 and fixedly installed at the top of the drive mechanism 4; the detection ring 6 is fixedly installed at the bottom of the lower mold base 2; and the sealing assembly is disposed inside the mold base 1.

[0024] The sealing assembly includes a demolding ejector pin 501 and a dustproof ring 609. The demolding ejector pin 501 is fixedly installed on the top of the transmission plate 5 and is slidably connected in the groove opened inside the lower mold base 2. The dustproof ring 609 is fixedly installed on the bottom of the detection ring 6.

[0025] The sealing assembly also includes a sealing cavity 601, a sealing lip 602, and a sealing ring 603. The sealing cavity 601 is located at the top of the detection ring 6; the sealing lip 602 is fixedly installed on the inner ring at the top of the detection ring 6; and the sealing ring 603 is fixedly installed on the outer ring at the top of the detection ring 6.

[0026] The sealing assembly also includes a through hole 604 and a detection cavity 605. The through hole 604 is arranged in a circumferential array inside the sealing cavity 601; the detection cavity 605 is opened inside the detection ring 6.

[0027] The sealing assembly also includes a transmission piston 606, which is slidably connected inside the detection chamber 605.

[0028] The specific usage and function of this embodiment are as follows: Under normal conditions, the sealing cavity 601 and the detection cavity 605 are interconnected through the through hole 604, while the drive piston 606 is located at the top of the detection cavity 605, on one side of the through hole 604. The sealing ring 603 seals the space between the sealing cavity 601 and the bottom of the lower mold base 2, while the sealing lip 602 seals the outer side of the sealing cavity 601 and the ejector pin 501. Together with the drive piston 606, the through hole 604 is blocked, making the sealing cavity 601 an independent sealed cavity.

[0029] During demolding, the drive mechanism 4 moves the transmission plate 5, causing the demolding ejector pin 501 to be ejected from the groove inside the lower mold base 2, thus ejecting the plastic material inside the cavity. During this process, the demolding ejector pin 501 always passes through the detection ring 6. The dustproof ring 609 at the bottom of the detection ring 6 can prevent external dust and debris from entering the detection ring 6 and the interior of the lower mold base 2 through the gap between the demolding ejector pin 501 and the detection ring 6. At the same time, a sealing element is provided at the joint between the groove of the lower mold base 2 and the demolding ejector pin 501 to achieve preliminary sealing of the movement path of the demolding ejector pin 501.

[0030] When the seal between the internal groove of the mold base 2 and the ejector pin 501 fails, the pressure inside the cavity will seep into the sealing cavity 601 through the gap between them. At this time, the sealing cavity 601 can prevent further pressure leakage through the secondary sealing structure of the sealing lip 602 and the sealing ring 603; at the same time, the pressure seeping into the sealing cavity 601 will enter the detection cavity 605 through the through hole 604, pushing the transmission piston 606 in the detection cavity 605 to move downward. This process can effectively buffer the seepage pressure through the displacement of the transmission piston 606, avoiding the instantaneous high pressure from directly impacting the sealing lip 602 and the sealing ring 603, and extending the service life of the secondary sealing structure.

[0031] Example 2: Based on Example 1, such as Figures 1 to 6 As shown, it also includes: a detection component, which is disposed inside the mold base 1.

[0032] The detection component includes an elastic element 607 and a displacement sensor 608. One end of the elastic element 607 is fixedly connected to the bottom of the detection cavity 605, and the other end of the elastic element 607 is fixedly connected to the bottom of the transmission piston 606. The displacement sensor 608 is fixedly installed at the bottom of the detection cavity 605, and the top of the displacement sensor 608 is fixedly connected to the transmission piston 606.

[0033] The specific usage and function of this embodiment are as follows: The elastic element 607 uses its elastic force to push the transmission piston 606 to move, so that the transmission piston 606 moves to the side of the through hole 604 at the top of the detection chamber 605, and blocks the through hole 604 to prevent the transmission piston 606 from being displaced by external factors such as gravity and vibration.

[0034] When the initial seal of the ejector pin 501 fails, pressure inside the mold cavity seeps into the sealing cavity 601 through the gap and enters the detection cavity 605 through the through hole 604. This pressure overcomes the elastic force of the elastic element 607, pushing the transmission piston 606 downwards along the inner wall of the detection cavity 605. During this process, the displacement of the transmission piston 606 directly triggers the displacement sensor 608 connected to it. The displacement sensor 608 can capture the piston displacement data in real time and convert the data into an electrical signal, which is then transmitted to an external controller. The controller then triggers an externally connected alarm to alert the operator.

[0035] The following points should be noted in this article: 1. The accompanying drawings of this embodiment only involve the structures involved in this embodiment; other structures can refer to the general design.

[0036] 2. Where there is no conflict, this embodiment and the features in the embodiment can be combined with each other to obtain new embodiments.

[0037] The above are merely specific implementations of this embodiment, but the protection scope of this embodiment is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this embodiment should be included within the protection scope of this embodiment. Therefore, the protection scope of this embodiment should be determined by the protection scope of the claims.

Claims

1. A demolding structure for an injection mold, characterized in that: The demolding structure of this injection mold includes a mold base (1), a lower mold base (2), an upper mold base (3), a drive mechanism (4), a transmission plate (5), a detection ring (6), a sealing component, and a detection component. The lower mold base (2) is bolted to the upper part of the mold base (1); the upper mold base (3) is slidably connected to the upper part of the lower mold base (2); the drive mechanism (4) is fixedly installed at the bottom of the mold base (1); the transmission plate (5) is vertically slidably connected inside the mold base (1), and the transmission plate (5) is fixedly installed at the top of the drive mechanism (4); the detection ring (6) is fixedly installed at the bottom of the lower mold base (2); the sealing component is located inside the mold base (1); and the detection component is located inside the mold base (1).

2. The demolding structure of an injection mold as described in claim 1, characterized in that: The sealing assembly includes a demolding ejector pin (501) and a dustproof ring (609). The demolding ejector pin (501) is fixedly installed on the top of the transmission plate (5) and is slidably connected in the groove opened inside the lower mold base (2). The dustproof ring (609) is fixedly installed on the bottom of the detection ring (6).

3. The demolding structure of an injection mold as described in claim 2, characterized in that: The sealing assembly further includes a sealing cavity (601), a sealing lip (602), and a sealing ring (603). The sealing cavity (601) is located on the top of the detection ring (6). The sealing lip (602) is fixedly installed on the inner top ring of the detection ring (6). The sealing ring (603) is fixedly installed on the outer top ring of the detection ring (6).

4. The demolding structure of an injection mold as described in claim 2, characterized in that: The sealing assembly further includes a through hole (604) and a detection cavity (605), wherein the through hole (604) is arranged in a circumferential array inside the sealing cavity (601); and the detection cavity (605) is opened inside the detection ring (6).

5. The demolding structure of an injection mold as described in claim 2, characterized in that: The sealing assembly further includes a transmission piston (606), which is slidably connected inside the detection chamber (605).

6. The demolding structure of an injection mold as described in claim 1, characterized in that: The detection assembly includes an elastic element (607) and a displacement sensor (608). One end of the elastic element (607) is fixedly connected to the bottom of the detection cavity (605), and the other end of the elastic element (607) is fixedly connected to the bottom of the transmission piston (606). The displacement sensor (608) is fixedly installed at the bottom of the detection cavity (605), and the top of the displacement sensor (608) is fixedly connected to the transmission piston (606).

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