Automatic demolding device

Abstract

The utility model discloses an automatic demolding device which comprises a fixed mold for placing a thin-wall injection molding product and an ejection mechanism arranged below the fixed mold, and the ejection mechanism at least comprises an inclined rod which penetrates through the fixed mold and is in contact with the inner surface of the thin-wall injection molding product; the ejection mechanism further comprises a bottom plate and an ejection rod arranged on the bottom plate through a lever mechanism. The bottom plate drives the inclined rod and the ejector rod to synchronously move towards the fixed mold so as to realize demolding; the free end of the ejector rod penetrates through the fixed mold and abuts against the inner surface of the thin-wall injection product. A pressing rod is arranged between the bottom plate and the fixed mold; the pressing rod exerts acting force on the lever mechanism so as to drive the ejector rod to move upwards relative to the inclined rod, and overturning demolding of the thin-wall injection molding product is achieved. The ejection mechanism has the beneficial effects that the ejection mechanism is used for driving the thin-wall injection molding product to demould, the lever mechanism is used for driving the ejection rod to further move upwards after demoulding, and the thin-wall injection molding product is inclined in the upward moving process, so that the thin-wall injection molding product automatically turns over and falls off after demoulding; and the automatic demolding action of the thin-wall injection molding product with the back-off structure is ensured to be completed.

Description

Technical Field

[0001] This utility model belongs to the field of molds, and in particular relates to an automatic demolding device. Background Technology

[0002] In the manufacturing of deep-cavity injection molds, demolding is an indispensable part of the production process. Mold design must consider the ease and efficiency of demolding. Difficult or inefficient demolding can lead to problems such as damage to thin-walled injection molded products, mold damage, or production delays. Therefore, a well-designed demolding structure and optimized demolding process are crucial to ensuring the quality and production efficiency of thin-walled injection molded products.

[0003] In traditional deep-cavity injection molding technology, molds are mainly used to produce planar thin-walled injection molded products. The demolding process is relatively simple and can be automated using structures such as ejector pins disclosed in existing patent CN209409215U, "An Ejector Pin Demolding Mechanism for an Injection Molding Machine." However, for thin-walled injection molded products with undercut structures, using ejector pins as described in the aforementioned patent can easily damage the undercut structure during demolding, failing to guarantee the integrity and yield of the demolded thin-walled injection molded product. Therefore, existing mold structures cannot achieve automated demolding, or require additional manual operation or robotic assistance during the demolding process of such thin-walled injection molded products. This not only increases production costs, reduces production efficiency and safety, but also affects the consistency and quality of thin-walled injection molded products.

[0004] To address the aforementioned problems, designing an automatic demolding device is an important technical issue that those skilled in the art need to solve. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide an automatic demolding device.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] An automatic demolding device includes a fixed mold for holding a thin-walled injection molded product and an ejection mechanism disposed below the fixed mold. The ejection mechanism includes at least a slanted rod that penetrates the fixed mold and contacts the inner surface of the thin-walled injection molded product. The ejection mechanism also includes a base plate and a push rod disposed on the base plate via a lever mechanism. The base plate drives the slanted rod and the push rod to move synchronously toward the fixed mold to achieve demolding. The free end of the push rod penetrates the fixed mold and abuts against the inner surface of the thin-walled injection molded product. A pressure rod is disposed between the base plate and the fixed mold. The pressure rod applies a force to the lever mechanism to drive the push rod to move upward relative to the slanted rod, thereby achieving demolding by flipping the thin-walled injection molded product.

[0008] Preferably, the pressure rod is disposed at the bottom end of the fixed mold or on the base plate, and the free end of the pressure rod penetrates through the upper surface of the base plate to contact the input end of the lever mechanism.

[0009] Preferably, the lever mechanism includes a rotating plate pivotally disposed within the base plate, a pressure rod and a push rod disposed at both ends of the rotating plate; the pressure rod contacts the upper surface of the input end of the rotating plate; the bottom end of the push rod is located within the rotating plate, and the top end of the push rod penetrates the rotating plate and extends into the fixed mold.

[0010] Preferably, the fixed mold also has a through hole for the inclined rod to pass through, and the diameter of the through hole is larger than the diameter of the inclined rod, so that the inclined rod can move within the range defined by the through hole.

[0011] Preferably, the bottom of the diagonal rod is disposed within the base plate via a connecting block; the connecting block has a notch for accommodating the diagonal rod, and a protrusion is formed within the notch to engage with the groove at the bottom end of the diagonal rod; the connecting block is screwed onto the base plate.

[0012] Preferably, the groove is inclined so that the assembled diagonal rod always forms an acute angle with the base plate.

[0013] Preferably, the top of the inclined rod has a protrusion extending away from the top rod, the protrusion engaging with the undercut structure on the thin-walled injection molded product; and during the operation of the ejection mechanism, the protrusion moves toward the top rod.

[0014] Preferably, the base plate is further provided with a support rod, the bottom of which is fixed inside the base plate and moves up and down synchronously with the inclined rod and the top rod.

[0015] Preferably, the base plate is lifted and lowered by a servo motor or a cylinder.

[0016] The advantages of this utility model's technical solution are mainly reflected in:

[0017] The thin-walled injection molded product is demolded by an ejection mechanism, and after demolding, the ejector rod is driven to move further upward by a lever mechanism. During the upward movement, the thin-walled injection molded product tilts and automatically flips over and falls after demolding. This ensures that the thin-walled injection molded product with the undercut structure can complete the automated demolding action, ensuring the yield and consistency of demolding. Moreover, no additional mechanical structure or manual operation is required, which reduces costs and improves safety.

[0018] The slant bar is engaged with the base plate via a connecting block and moves along the direction of the protrusion on the connecting block during the upward movement, so as to gradually increase the distance between the protrusion at the top of the slant bar and the undercut of the thin-walled injection molded product, thereby facilitating the subsequent automatic flipping and demolding action of the thin-walled injection molded product.

[0019] The top rod, diagonal rod, and support rod are arranged in a triangle to ensure stable contact with the inner surface of the thin-walled injection molded product during the lifting process, thus ensuring the stability of the thin-walled injection molded product during movement. Attached Figure Description

[0020] Figure 1 : A perspective view of a preferred embodiment of the present invention;

[0021] Figure 2 : Front view of a preferred embodiment of this utility model;

[0022] Figure 3 : Initial state cross-sectional view of the preferred embodiment of this utility model;

[0023] Figure 4 : Cross-sectional view of the demolded state of the preferred embodiment of this utility model;

[0024] Figure 5 : Cross-sectional view of the preferred embodiment of this utility model in the flipped state;

[0025] Figure 6 Partial structural diagram of the ejection mechanism of a preferred embodiment of this utility model;

[0026] Figure 7 : Structural diagram of the inclined rod in the preferred embodiment of this utility model. Detailed Implementation

[0027] The purpose, advantages, and features of this utility model will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this utility model, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0028] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0029] like Figures 1 to 2As shown, this utility model discloses an automatic demolding device, including a fixed mold 1 for placing a thin-walled injection molded product and an ejection mechanism 2 disposed below the fixed mold 1. The ejection mechanism 2 includes at least a slanted rod 21 that penetrates the fixed mold 1 and contacts the inner surface of the thin-walled injection molded product; specifically, the fixed mold 1 also has a through hole 10 formed to facilitate the passage of the slanted rod 21, and the diameter of the through hole 10 is larger than the diameter of the slanted rod 21, so that the slanted rod 21 can move within the range defined by the through hole 10.

[0030] Further, such as Figures 3 to 5 As shown, the ejection mechanism 2 also includes a base plate 20, and the bottom of the inclined rod 21 is disposed within the base plate 20 via a connecting block 23. The connecting block 23 has a notch for accommodating the inclined rod 21, and is screwed onto the base plate 20. A protrusion 230 is formed within the notch on the inclined rod 21, engaging with a groove 210 at the bottom of the inclined rod 21. The groove 210 is inclined so that the assembled inclined rod 21 always forms an acute angle with the base plate 20; that is, the groove 210 ensures that the inclined rod 21 always remains in an inclined state and moves laterally along the connecting block 23 during the lifting process, and the protrusion 230 acts as a guide during the lifting process.

[0031] Furthermore, such as Figure 7 As shown, the top surface of the inclined rod 21 is preferably an inclined surface that matches the inner surface of the thin-walled injection molded product, and this inclined surface serves as a guide in the flipped state. The top of the inclined rod 21 has a protrusion 211 extending away from the ejector rod 22. The protrusion 211 engages with the undercut structure on the thin-walled injection molded product; and during the operation of the ejection mechanism 2, the protrusion 211 moves towards the ejector rod 22.

[0032] like Figure 6 As shown, the ejection mechanism 2 also includes ejector rods 22 mounted on the base plate 20 via a lever mechanism 3. In the initial state, the base plate 20 is positioned below the fixed mold 1, with the thin-walled injection molded product located within the fixed mold 1, and the tips of the ejector rods 22 and the inclined rods 21 contacting the inner surface of the thin-walled injection molded product. The base plate 20 is driven to rise and fall by a linear drive mechanism such as a servo motor or cylinder. Since the servo motor and cylinder are known existing technologies, their specific structures are not limited here. After the servo motor or cylinder is started, the base plate 20 drives the inclined rods 21 and ejector rods 22 to move synchronously towards the fixed mold 1. Figure 4 The demolding state shown is that during the upward movement of the inclined rod 21 and the ejector rod 22, an upward force is applied to the thin-walled injection molded product, causing the thin-walled injection molded product to separate from the fixed mold 1, thereby achieving demolding.

[0033] The free end of the ejector rod 22 passes through the fixed mold 1 and abuts against the inner surface of the thin-walled injection molded product; that is, a through hole with an outer diameter equivalent to that of the ejector rod 22 is formed on the fixed mold 1, and the diameter of the through hole is smaller than the diameter of the through hole 10 through which the inclined rod 21 passes; the through hole serves to limit the position of the ejector rod 22, and also serves as a guide during the lifting and lowering of the ejector rod 22.

[0034] like Figure 5 As shown, a pressure rod 102 is provided between the base plate 20 and the fixed mold 1; the pressure rod 102 is disposed at the bottom end of the fixed mold 1 or on the base plate 20, and the free end of the pressure rod 102 penetrates through the upper surface of the base plate 20 to contact the input end of the lever mechanism 3. In the flipped state, the pressure rod 102 applies a force to the lever mechanism 3 to drive the push rod 22 to move upward relative to the inclined rod 21, thereby realizing the flipping and demolding of the thin-walled injection molded product.

[0035] Furthermore, the lever mechanism 3 includes a rotating plate 31 pivotally mounted within the base plate 20, and a pressure rod 102 and a push rod 22 disposed at both ends of the rotating plate 31. The bottom end of the pressure rod 102 contacts the upper surface of the input end of the rotating plate 31; the bottom end of the push rod 22 is located within the rotating plate 31, and the top end of the push rod 22 penetrates the rotating plate 31 and extends into the fixed mold 1. In the initial state, since the weight of the push rod 22 is greater than the weight of the pressure rod 102, and when the push rod 22 abuts against the thin-walled injection molded product, the push rod 22 will be subjected to a reaction force from the thin-walled injection molded product. Therefore, the output end of the rotating plate 31 is lower than its input end, that is, the bottom end of the push rod 22 is lower than the bottom end of the pressure rod 102.

[0036] Furthermore, a support rod 24 is also provided on the base plate 20. The bottom of the support rod 24 is fixed inside the base plate 20 and rises and falls synchronously with the inclined rod 21 and the top rod 22. The support rod 24, the top rod 22, and the inclined rod 21 are arranged in a triangle to ensure stable contact with the inner surface of the thin-walled injection molded product during the lifting process, thus ensuring the stability of the thin-walled injection molded product during movement.

[0037] The working process of this utility model is briefly described below:

[0038] S1, start the servo motor or cylinder to drive the base plate 20 to move towards the fixed mold 1 until the top of the pressure rod 102 contacts the lower surface of the fixed mold 1, or the bottom of the pressure rod 102 contacts the upper surface of the rotating plate 31 in the lever mechanism 3; at this time, the base plate 20 preferably moves 21mm, and the thin-walled injection molded product is lifted by at least the ejector rod 22 and the inclined rod 21 and disengages from the fixed mold 1; the inclined rod 21 realizes the demolding operation; during the upward movement of the base plate 20, the inclined rod 21 gradually moves towards the ejector rod 22 and disengages from the undercut mechanism on the thin-walled injection molded product.

[0039] S2, the servo motor or cylinder continues to drive the base plate 20 to move, the pressure rod 102 applies a force to the input end of the rotating plate 31, causing the rotating plate 31 to rotate around the pivot, while the ejector rod 22 continues to rise relative to the inclined rod 21 until the lower surface of the input end of the rotating plate 31 abuts against the base plate 20. At this time, the base plate 20 preferably displaces by 4mm, and the ejector rod 22 moves upward by about 8.5mm. During this process, the ejector rod 22 causes the thin-walled injection molded product to tilt and automatically fall under the action of gravity, realizing the flipping and demolding operation.

[0040] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. An automatic demolding device, comprising a fixed mold (1) for placing a thin-walled injection molded product and an ejection mechanism (2) disposed below the fixed mold (1), the ejection mechanism (2) comprising at least a slanted rod (21) penetrating the fixed mold (1) and contacting the inner surface of the thin-walled injection molded product; characterized in that: The ejection mechanism (2) further includes a base plate (20) and an ejector rod (22) disposed on the base plate (20) via a lever mechanism (3); the base plate (20) drives the inclined rod (21) and the ejector rod (22) to move synchronously toward the fixed mold (1) to achieve demolding; and the free end of the ejector rod (22) passes through the fixed mold (1) and abuts against the inner surface of the thin-walled injection molded product; a pressure rod (102) is disposed between the base plate (20) and the fixed mold (1); the pressure rod (102) applies a force to the lever mechanism (3) to drive the ejector rod (22) to move upward relative to the inclined rod (21) to achieve demolding of the thin-walled injection molded product.

2. The automatic demolding device according to claim 1, characterized in that: The pressure rod (102) is disposed at the bottom end of the fixed mold (1) or on the base plate (20), and the free end of the pressure rod (102) penetrates the upper surface of the base plate (20) to contact the input end of the lever mechanism (3).

3. The automatic demolding device according to claim 1, characterized in that: The lever mechanism (3) includes a rotating plate (31) pivotally disposed within the base plate (20), a pressure rod (102) and a top rod (22) disposed at both ends of the rotating plate (31); the pressure rod (102) contacts the upper surface of the input end of the rotating plate (31); the bottom end of the top rod (22) is located within the rotating plate (31), and the top end of the top rod (22) penetrates the rotating plate (31) and extends into the fixed mold (1).

4. The automatic demolding device according to claim 1, characterized in that: The fixed mold (1) also has a through hole (10) for the inclined rod (21) to pass through, and the diameter of the through hole (10) is larger than the diameter of the inclined rod (21) so that the inclined rod (21) can move within the range defined by the through hole (10).

5. The automatic demolding device according to claim 1, characterized in that: The bottom of the diagonal rod (21) is set in the base plate (20) by a connecting block (23); a notch is formed on the connecting block (23) for accommodating the diagonal rod (21), and a protrusion (230) is formed in the notch to engage with the groove (210) at the bottom end of the diagonal rod (21); the connecting block (23) is screwed onto the base plate (20).

6. The automatic demolding device according to claim 5, characterized in that: The groove (210) is inclined so that the assembled inclined rod (21) is always set at an acute angle with the base plate (20).

7. The automatic demolding device according to claim 1, characterized in that: The top of the inclined rod (21) has a protrusion (211) extending away from the top rod (22), the protrusion (211) engaging with the undercut structure on the thin-walled injection molded product; and the protrusion (211) moves toward the top rod (22) during the operation of the ejection mechanism (2).

8. The automatic demolding device according to claim 1, characterized in that: A support rod (24) is also provided on the base plate (20). The bottom of the support rod (24) is fixed inside the base plate (20) and rises and falls synchronously with the inclined rod (21) and the top rod (22).

9. The automatic demolding device according to claim 8, characterized in that: The base plate (20) is lifted by a servo motor or cylinder.

Images