A demolding mechanism

Abstract

The application discloses a demolding mechanism, comprising a female mold plate, the female mold plate comprising a product cavity, a sliding cavity and a clamping structure, the clamping structure being slidably arranged in the sliding cavity, a product runner being arranged in the clamping structure, the product runner penetrating through the clamping structure and being communicated with the product cavity, the clamping structure comprising a first movable piece, a second movable piece and a limiting block arranged in sequence along the side wall of the sliding cavity, wherein the material handle formed in the product runner drives the first movable piece and the second movable piece to move in a direction away from the product cavity until the first movable piece abuts against the limiting block to complete the first-stage demolding; the material handle drives the second movable piece to move in a direction away from the product cavity until the second movable piece abuts against the limiting block to complete the second-stage demolding. The demolding mechanism divides the force that needs to be overcome by the material handle during demolding into three stages by the cooperation relationship among the first movable piece, the second movable piece and the limiting block, thereby avoiding the problems of long demolding cycle and high cost caused by insufficient cooling of the material handle.

Description

Technical Field

[0001] This invention relates to the field of mold preparation technology, and in particular to a demolding mechanism. Background Technology

[0002] Molds are an indispensable tool in injection molding. Injection molding is a processing method in which hot, molten plastic material is injected at high speed into a closed cavity of the desired shape. After the plastic material cools and solidifies, the mold is opened and the solidified plastic product is ejected, thus obtaining the molded product. Because injection molding has the advantages of low molding cost, short molding cycle, simple molding process, and ease of molding complex shapes, it is widely used in the field of plastic product applications.

[0003] In conventional three-platen injection molding, the material ejection cycle is long due to the action of the pull pin. This is because the material ejection is not fully cooled and does not shrink sufficiently, leaving it in an expanded state. This results in a large clamping force between the material ejection and the product runner, requiring sufficient cooling time to ensure effective ejection. Consequently, the injection molding cycle is long, affecting the overall injection molding economy. Summary of the Invention

[0004] The purpose of this invention is to provide a demolding mechanism with a simple structure and convenient operation. It achieves three-stage demolding through the cooperation between the first movable part, the second movable part and the limiting block. By using a layer-by-layer peeling structure, the clamping force between the material handle and the product flow channel is reduced layer by layer, so that the clamping force is released in three stages, ultimately improving the injection molding cycle and increasing the economy of mass production.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A demolding mechanism includes a mother template, which includes a product cavity, a sliding cavity, and a locking structure. The locking structure is slidably disposed in the sliding cavity. A product flow channel is provided within the locking structure, penetrating the locking structure and communicating with the product cavity. The locking structure includes a first movable member, a second movable member, and a limiting block sequentially disposed along the sidewall of the sliding cavity.

[0007] A material handle is formed within the product flow channel. The material handle drives the first movable component and the second movable component to move away from the product cavity until the first movable component abuts against the limiting block to complete the first stage of demolding. The material handle drives the second movable component to move away from the product cavity until the second movable component abuts against the limiting block to complete the second stage of demolding.

[0008] Preferably, the limiting block includes a first step portion, and the material handle drives the first movable member and the second movable member to move away from the product cavity until the first movable member abuts against the vertical sidewall of the first step portion to complete the first demolding stage.

[0009] Preferably, the limiting block includes a second step portion, the first step portion and the second step portion are arranged sequentially along the direction away from the product cavity, and the distance between the first step portion and the second step portion and the product flow channel decreases sequentially. The material handle drives the second movable member to move in the direction away from the product cavity until the second movable member abuts against the vertical sidewall of the second step portion to complete the second demolding.

[0010] Preferably, the mother template is provided with a third step, a fourth step, and a fifth step on the bottom surface of the sliding cavity, and the heights of the third step, the fourth step, and the fifth step decrease sequentially.

[0011] Preferably, the first movable component is slidably disposed on the third step, the limiting block is fixedly disposed on the fifth step, and the second movable component is slidably disposed on the second step. The first movable component and the second movable component abut against each other before demolding to form the product flow channel.

[0012] Preferably, the first movable member includes a sliding part and a protruding part. The sliding part is slidably disposed on the third step part, and the protruding part extends toward the horizontal sidewall of the fourth step part without contacting it. The material handle drives the first movable member and the second movable member to move away from the product cavity until the protruding part abuts against the vertical sidewall of the first step part.

[0013] Preferably, the second movable member includes a groove, the bottom surface of which is slidably disposed on the second step portion. The material handle drives the second movable member to move away from the product cavity until the vertical sidewall of the groove abuts against the vertical sidewall of the second step portion.

[0014] Preferably, before demolding, the distance between the protrusion and the vertical sidewall of the first step is a, and the distance between the vertical sidewall of the groove and the vertical sidewall of the second step is b, and a <b。

[0015] Preferably, the mother template has a drive plate on the side away from the product cavity, and the drive plate has a material pulling pin, which is fixed to the drive plate and connected to the material handle.

[0016] Preferably, the drive plate includes a material feeding plate and a panel, the material feeding plate and the panel are arranged sequentially along a direction away from the mother template, and the material pulling pin is fixed to the panel and passes through the material feeding plate to connect to the material handle.

[0017] Compared with the prior art, the advantages and technical effects of the present invention are:

[0018] This invention analyzes the overall direction of the force in the flow channel. Due to insufficient cooling and insufficient shrinkage of the material handle, the clamping force between the material handle and the product flow channel is large, leading to film sticking. At this time, the pulling pin needs to overcome a large force. The solution provided by this invention divides the demolding process into three stages, and the process of overcoming the force is also divided into three stages. Under the same cooling and cycle effect, the demolding effect is optimized, thereby achieving the purpose of reducing cycle and improving the economy of mass production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a demolding mechanism;

[0020] Figure 2 This is an enlarged schematic diagram of a demolding mechanism.

[0021] Figure 3 This is a schematic diagram of the locking structure of a demolding mechanism.

[0022] In the diagram: 1. Mother template; 2. Material feeding plate; 3. Panel; 11. Engaging structure; 12. Product cavity; 13. Sliding cavity; 14. Product flow channel; 15. Material handle; 16. Third step; 17. Fourth step; 18. Fifth step; 31. Pull pin; 32. Guide post; 111. First moving part; 112. Second moving part; 113. Limiting block; 1111. Sliding part; 1112. Protrusion; 1121. Groove; 1131. First step; 1132. Second step. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0026] Please refer to the reference. Figure 1 — Figure 3 As shown, in an embodiment of the present invention, the demolding mechanism includes a mother template 1, which includes a locking structure 11, a product cavity 12, and a sliding cavity 13. The locking structure 11 is slidably disposed in the sliding cavity 13. A product flow channel 14 is disposed within the locking structure 11, which passes through the locking structure 11 and connects to the product cavity 12. The locking structure 11 includes a first movable member 111, a second movable member 112, and a limiting block 113 arranged sequentially along the side wall of the sliding cavity 13. During demolding, a material handle 15 is formed in the product flow channel 14 under the action of external force. The material handle 15 drives the first movable member 111 and the movable member 112 to move away from the product cavity 12 until the first movable member 111 abuts against the limiting block 113 to complete the first stage of demolding. The material handle 15 drives the second movable member 112 to continue moving away from the product cavity 12 until the second movable member 112 abuts against the limiting block 113 to complete the second stage of demolding.

[0027] Specifically, such as Figure 1 — Figure 3 In the illustrated embodiment, the first movable member 111 is disposed at one end of the slide cavity 13 near the product cavity 12, and the second movable member 112 is disposed at one end of the slide cavity 13 away from the product cavity 12. Before demolding, the first movable member 111 and the second movable member 112 abut against each other. The product flow channel 14 passes through the first movable member 111 and the second movable member 112 and connects to the product cavity 12. During demolding, the material handle 15 is pulled out from the product flow channel 14. Since the product flow channel 14 passes through the first movable member 111 and the second movable member 112, the material handle formed in the product flow channel will exert a clamping force on the first movable member and the second movable member. When the material handle 15 is pulled outward, the clamping force between the material handle 15 and the inner wall of the product flow channel 14 can drive the first movable member 111 and the second movable member 112 to move away from the product cavity 12. The limiting effect of the limiting block 113 can achieve the purpose of segmented demolding, reduce the clamping force of the material handle 15 layer by layer, shorten the demolding cycle, and reduce the demolding time.

[0028] In this embodiment, the limiting block 113 is provided with a first step portion 1131 and a second step portion 1132, wherein the first step portion 1131 is used to control the first stage of the demolding process, and the second step portion 1132 is used to control the second stage of the demolding process. The first step portion 1131 and the second step portion 1132 are arranged sequentially along the direction away from the product cavity 12, that is, the first step portion 1131 is located on the side close to the product cavity 12, and the second step portion 1132 is located on the side away from the product cavity 12; at the same time, the distance between the first step portion 1131 and the second step portion 1132 and the product flow channel 14 decreases sequentially, and furthermore, the second step portion 1132 is located on the top of the first step portion 1131. It should be noted that the limiting block 113 is an integral structure in this embodiment, but it can also be a split structure in other embodiments. At the same time, the stepped structure set in the limiting block 113 is mainly for segmented control of the demolding process. Each step corresponds to a demolding process, thereby reducing the clamping force of the material in layers. It can be understood that the limiting block 113 only needs to achieve segmented control of the demolding process, and the shape of the limiting block 113 is not limited.

[0029] In this embodiment, to better support the engaging structure 11, the mother mold 1 has a third step 16, a fourth step 17, and a fifth step 18 on the bottom surface of the slide cavity 13. These three steps are arranged sequentially along the direction away from the product cavity 12; that is, the third step 16 is located on the side closest to the product cavity 12, the fifth step 18 is located on the side furthest from the product cavity 12, and the fourth step 17 is located between the third step 16 and the fifth step 18. Furthermore, the distances between the third step 16, the fourth step 17, and the fifth step 18 and the central axis of the product flow channel 14 increase sequentially, meaning their heights decrease sequentially. The purpose of these three steps is to better support the engaging structure 11 in the slide cavity 13, thus facilitating a smooth demolding process.

[0030] In this embodiment, the first movable member 111 includes a sliding portion 1111 and a protruding portion 1112. The sliding portion 1111 is slidably disposed on the third step portion 16, wherein the bottom surface of the sliding portion 1111 rests on the horizontal sidewall of the third step portion 16; the protruding portion 1112 extends toward the horizontal sidewall of the fourth step portion 17 but does not contact it, and before demolding, the vertical sidewall of the protruding portion 1112 is in contact with the vertical sidewall of the third step portion 16. The sliding portion 1111 can cooperate with the third step portion 16 to complete the sliding process of the first movable member 111 during the first stage of demolding, and the protruding portion 1112 can abut against the limiting block 113 to prevent the sliding stroke of the first movable member 111, thereby completing the first stage of demolding.

[0031] In this embodiment, the second movable member 112 includes a groove 1121. The opening of the groove 1121 faces the second step portion 1132, and the bottom surface of the groove 1121 is slidably disposed on the horizontal side wall of the second step portion 1132. It can be understood that the entire second step portion 1132 extends into the groove 1121. During the second-stage demolding, the sprue 15 drives the second movable member 112 to move away from the product cavity 12. The bottom surface of the groove 1121 slides on the horizontal side wall of the second step portion 1132 until the vertical side wall of the groove 1121 abuts against the second step portion 1132. By the vertical side wall of the second step portion 1132 abutting against the vertical side wall of the groove 1121, the limiting block 113 can block the stroke of the second movable member 112, thereby completing the second-stage demolding process.

[0032] It should be noted that the structures adopted by the first movable member 111 and the second movable member 112 in this embodiment are only one case, and their specific structures are not limited, as long as the purpose of segmented demolding can be achieved.

[0033] In this embodiment, the limiting block 113 is fixedly disposed on the fifth step portion 18. Among them, a fixing member is provided on the vertical side wall of the fifth step portion 18 to fix the limiting block 113 on the fifth step portion 18. The limiting block 113 is placed on the horizontal side wall of the fifth step portion 18. After being fixed, the limiting block 113 can achieve the purpose of segmented demolding by blocking the strokes of the first movable member 111 and the second movable member 112.

[0034] It can be understood that the distance between the protruding portion 1112 and the vertical side wall of the first step portion 1131 before demolding is a, and the distance between the vertical side wall of the groove 1121 and the vertical side wall of the second step portion 1132 is b. Then a < b, that is, during the demolding process, when the sprue 15 drives the protruding portion 1112 to abut against the first step portion 1131, the vertical side wall of the groove 1121 still does not contact the vertical side wall of the second step portion 1132. At this time, the first-stage demolding process ends, and the distance between the groove 1121 and the second step portion 1132 leaves space for the second-stage demolding, so that the sprue 15 can continue to drive the second movable member 112 to move away from the product cavity 12 until the vertical side wall of the groove 1121 abuts against the vertical side wall of the second step portion 1132, completing the second-stage demolding.

[0035] In this embodiment, the demolding mechanism also includes a material ejector plate 2 and a panel 3. The material ejector plate 2 and the panel 3 are arranged sequentially along the direction away from the mother template 1, that is, the material ejector plate 2 is arranged on the side close to the mother template 1, and the panel 3 is arranged on the side away from the mother template 1. A guide post 32 is provided through the mother template 1, the material ejector plate 2 and the panel 3. The guide post 32 allows the mother template 1, the material ejector plate 2 and the panel 3 to reciprocate during demolding. A material pull pin 31 is fixed on the panel 3. The material pull pin 31 passes through the material ejector plate 2 and connects to the material handle 15. The material handle 15 is dragged away from the mother template 1 by the material pull pin 31 until the demolding process is completed.

[0036] In use, the pull pin 31 drives the material handle 15 to move away from the mother mold 1. After being subjected to force, the material handle 15 overcomes the clamping force between itself and the product flow channel 14 and disengages from the product flow channel 14. Due to the clamping force, the first movable part 111 and the second movable part 112 move together with the material handle 15 away from the product cavity 12. During the movement, the bottom surfaces of the sliding part 1111 and the groove 1121 slide on the horizontal sidewalls of the third step part 16 and the second step part 1132, respectively, until the protrusion 1112 abuts against the vertical sidewall of the first step part 1131. At this time, due to the obstruction of the first step part 1131, the first movable part 111 can no longer follow the material handle. The first demolding process ends when the material handle 15 moves together with the second movable part 112, which overcomes the resistance and continues to move away from the product cavity 12 until the vertical sidewall of the groove 1121 abuts against the vertical sidewall of the second step 1132. Under the obstruction of the second step 1132, the second movable part 112 cannot move together with the material handle 15, and the second demolding process ends. The material handle 15 continues to overcome the resistance and move away from the product cavity 12 until the material handle 15 is completely removed from the product flow channel 14. At this time, the mother mold plate 1 and the push plate 2 are pulled apart by a corresponding distance. Force is applied to pull the push plate 2 and the panel 3 apart, so that the material handle 15 is separated from the pull pin 31, and the demolding process ends.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A demolding mechanism, comprising a mother template, characterized in that, The master template includes a product cavity, a sliding cavity, and a locking structure. The locking structure is slidably disposed in the sliding cavity. A product flow channel is provided within the locking structure, penetrating the locking structure and communicating with the product cavity. The locking structure includes a first movable member, a second movable member, and a limiting block sequentially arranged along the sidewall of the sliding cavity. A material handle is formed within the product flow channel. The material handle drives the first movable component and the second movable component to move away from the product cavity until the first movable component abuts against the limiting block to complete the first stage of demolding. The material handle drives the second movable component to move away from the product cavity until the second movable component abuts against the limiting block to complete the second stage of demolding.

2. The demolding mechanism according to claim 1, characterized in that, The limiting block includes a first step portion. The material handle drives the first movable part and the second movable part to move away from the product cavity until the first movable part abuts against the vertical sidewall of the first step portion to complete the first demolding.

3. The demolding mechanism according to claim 2, characterized in that, The limiting block includes a second step portion. The first step portion and the second step portion are arranged sequentially along the direction away from the product cavity, and the distance between the first step portion and the second step portion and the product flow channel decreases sequentially. The material handle drives the second movable part to move away from the product cavity until the second movable part abuts against the vertical sidewall of the second step portion to complete the second demolding.

4. A demolding mechanism according to claim 3, characterized in that, The mother template is provided with a third step, a fourth step, and a fifth step on the bottom surface of the sliding cavity, and the height of the third step, the fourth step, and the fifth step decreases in sequence.

5. A demolding mechanism according to claim 4, characterized in that, The first movable part is slidably disposed on the third step, the limiting block is fixedly disposed on the fifth step, and the second movable part is slidably disposed on the second step. The first movable part and the second movable part abut against each other before demolding to form the product flow channel.

6. A demolding mechanism according to claim 5, characterized in that, The first movable component includes a sliding part and a protruding part. The sliding part is slidably disposed on the third step part, and the protruding part extends toward the horizontal sidewall of the fourth step part without contacting it. The material handle drives the first movable component and the second movable component to move away from the product cavity until the protruding part abuts against the vertical sidewall of the first step part.

7. A demolding mechanism according to claim 6, characterized in that, The second movable component includes a groove, the bottom surface of which is slidably disposed on the second step portion. The material handle drives the second movable component to move away from the product cavity until the vertical sidewall of the groove abuts against the vertical sidewall of the second step portion.

8. A demolding mechanism according to claim 7, characterized in that, Before demolding, the distance between the protrusion and the vertical sidewall of the first step is 'a', and the distance between the vertical sidewall of the groove and the vertical sidewall of the second step is 'b', and a <b。 9. A demolding mechanism according to claim 1, characterized in that, The mother template has a drive plate on the side away from the product cavity. The drive plate has a material pulling pin, which is fixed to the drive plate and connected to the material handle.

10. A demolding mechanism according to claim 9, characterized in that, The drive plate includes a material feeding plate and a panel. The material feeding plate and the panel are arranged sequentially along a direction away from the mother template. The material pulling pin is fixed to the panel and passes through the material feeding plate to connect to the material handle.

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