Ejection mechanism for injection mold

Abstract

The utility model relates to the technical field of mold ejection mechanisms, and discloses an ejection mechanism for an injection mold, which comprises a base, a product mold is mounted at the top of the base, a driving rod is rotatably connected to an inner cavity of the base, a moving block is in threaded connection with the outer wall of the driving rod, and a supporting plate is rotatably connected to the outer wall of the moving block. According to the ejection mechanism for the injection mold, the driving rod and the transmission rod are arranged in the inner cavity of the base, when the driving rod rotates, the transmission rod can be driven to rotate, then a moving block moves on the outer walls of the driving rod and the transmission rod, the angle between the outer wall of a supporting plate and the outer wall of a connecting plate is changed, and then an ejection plate is lifted upwards; the product is separated from the mold under the action of the jacking plate, and the contact area between the jacking plate and the bottom of the product is larger, so that the product can be better demolded, and the situation that the contact area between a traditional jacking rod and the bottom of the product is smaller is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of mold ejection mechanisms, specifically an ejection mechanism for injection molds. Background Technology

[0002] Injection molding is a processing method used for mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic into the mold cavity under high pressure by an injection molding machine. After cooling and solidification, the molded product is obtained. After molding, the product needs to be demolded. After cooling and molding, the product sticks to the cavity and needs to be demolded, so an ejector mechanism is required.

[0003] Traditional ejection mechanisms typically use ejector rods at the bottom of the mold to push the product upwards. However, when the ejector rod contacts the bottom of the product, the contact area between the top of the ejector rod and the bottom of the product is also small due to the small top area of ​​the ejector rod. Directly pushing the product upwards can cause uneven force on the bottom of the product, making it difficult for the product to detach properly from the mold. If the ejection force of the ejector rod is too large, it can also damage the product itself and affect subsequent processes. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an ejection mechanism for injection molds, which has the advantages of stable ejection and ease of use, thus solving the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: an ejection mechanism for injection molds, including a base, a product mold mounted on the top of the base, a drive rod rotatably connected to the inner cavity of the base, a moving block threadedly connected to the outer wall of the drive rod, a support plate rotatably connected to the outer wall of the moving block, a connecting plate rotatably connected to the outer wall of the support plate, a lifting plate rotatably connected to the outer wall of the connecting plate, a drive sprocket fixedly mounted on the outer wall of the drive rod, a transmission rod rotatably connected to the inner cavity of the base, a driven sprocket fixedly mounted on the outer wall of the transmission rod, a lifting frame fixedly mounted on the bottom of the lifting plate, a lifting plate movably sleeved within the inner cavity of the lifting frame, a drive motor fixedly mounted on the bottom of the lifting plate, a drive screw fixedly mounted on the power output shaft of the drive motor, and a transmission chain meshing with the outer wall of the drive sprocket.

[0006] As a preferred technical solution of this utility model: both ends of the outer wall of the drive rod are provided with external threads, and the threads on the outer walls of the two ends of the drive rod are in opposite directions.

[0007] As a preferred technical solution of this utility model: a limiting plate is installed on the outer wall of the movable block, and a limiting groove is opened in the inner cavity of the base, and the inner wall shape of the limiting groove matches the outer wall shape of the limiting plate.

[0008] As a preferred technical solution of this utility model: the outer wall of the end of the transmission chain away from the drive sprocket is rolledly connected to the outer wall of the driven sprocket, and the inner wall of the transmission chain is meshed with the outer wall of the driven sprocket.

[0009] As a preferred technical solution of this utility model: the outer wall of the connecting plate away from the support plate is rotatably connected to the outer wall of the moving block, and the top of the lifting plate is provided with a moving hole, and the inner wall shape of the moving hole matches the outer wall shape of the lifting plate.

[0010] As a preferred technical solution of this utility model: the inner cavity of the lifting frame is provided with a moving groove, and the inner wall shape of the moving groove matches the outer wall shape of the lifting plate.

[0011] As a preferred technical solution of this utility model: the inner cavity of the lifting plate is provided with an internal thread, and the inner wall thread of the lifting plate meshes with the outer wall thread of the driving screw.

[0012] As a preferred technical solution of this utility model: there are two lifting frames, and the two lifting frames are respectively installed on both sides of the bottom of the lifting plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The ejection mechanism of this injection mold uses a drive rod and a transmission rod set in the inner cavity of the base. When the drive rod rotates, it drives the transmission rod to rotate, which in turn causes the moving block to move on the outer wall of the drive rod and the transmission rod. This changes the angle between the outer wall of the support plate and the connecting plate, thereby raising the ejector plate. Under the action of the ejector plate, the product is released from the mold. Furthermore, the contact area between the ejector plate and the bottom of the product is larger, which can better demold the product and avoid the situation where the contact area between the ejector rod and the bottom of the product is small in traditional ejector rods.

[0015] 2. The ejection mechanism of this injection mold uses a lifting frame set at the bottom of the lifting plate and a lifting plate set in the inner cavity of the lifting frame. Under the action of the drive motor, the lifting plate is driven to rise from the bottom of the lifting plate, thereby lifting the product on the top of the lifting plate again, so that the product is separated from the lifting plate, preventing the product from sticking to the bottom of the lifting plate, and making the product easier to demold. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0018] Figure 3This is a schematic diagram of the base structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the drive rod structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the lifting frame structure of this utility model.

[0021] In the diagram: 1. Base; 2. Product mold; 3. Drive rod; 4. Moving block; 5. Support plate; 6. Connecting plate; 7. Lifting plate; 8. Drive sprocket; 9. Transmission rod; 10. Driven sprocket; 11. Lifting frame; 12. Drive motor; 13. Drive screw; 14. Lifting plate; 15. Transmission chain. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1 - Figure 5 An ejection mechanism for an injection mold includes a base 1, a product mold 2 mounted on the top of the base 1, a drive rod 3 rotatably connected to the inner cavity of the base 1, a moving block 4 threadedly connected to the outer wall of the drive rod 3, a support plate 5 rotatably connected to the outer wall of the moving block 4, a connecting plate 6 rotatably connected to the outer wall of the support plate 5, a lifting plate 7 rotatably connected to the outer wall of the connecting plate 6, a drive sprocket 8 fixedly mounted on the outer wall of the drive rod 3, a transmission rod 9 rotatably connected to the inner cavity of the base 1, a driven sprocket 10 fixedly mounted on the outer wall of the transmission rod 9, a lifting frame 11 fixedly mounted on the bottom of the lifting plate 7, a lifting plate 14 movably sleeved in the inner cavity of the lifting frame 11, a drive motor 12 fixedly mounted on the bottom of the lifting plate 7, a drive screw 13 fixedly mounted on the power output shaft of the drive motor 12, and a transmission chain 15 meshing with the outer wall of the drive sprocket 8.

[0024] In the above structure, the driving rod 3 is provided in the inner cavity of the base 1, and the moving block 4 is provided on the outer wall of the driving rod 3. Under the action of the driving rod 3, the moving blocks 4 on both sides will move simultaneously, either inward or outward, thereby changing the angle between the outer walls of the support plate 5 and the connecting plate 6, and thus lifting the lifting plate 7, so that the lifting plate 7 lifts the product in the inner cavity of the product mold 2.

[0025] In a preferred embodiment, both ends of the outer wall of the drive rod 3 are provided with external threads, and the threads on the outer walls of the two ends of the drive rod 3 are in opposite directions.

[0026] In the above structure, the external threads provided at both ends of the outer wall of the drive rod 3 enable the moving blocks 4 at both ends to move along the outer wall of the drive rod 3 simultaneously when the drive rod 3 rotates, thereby better lifting the lifting plate 7 by changing the angle between the outer walls of the support plate 5 and the connecting plate 6.

[0027] In a preferred embodiment: a limiting plate is installed on the outer wall of the movable block 4, and a limiting groove is formed in the inner cavity of the base 1, and the inner wall shape of the limiting groove matches the outer wall shape of the limiting plate.

[0028] In the above structure, by installing a limiting plate on the outer wall of the moving block 4 and a limiting groove opened in the inner cavity of the base 1, the moving blocks 4 on both sides move along the outer wall of the driving rod 3 under the action of the driving rod 3, thereby driving the lifting plate 7.

[0029] In a preferred embodiment, the outer wall of the drive chain 15 at the end away from the drive sprocket 8 is in rolling connection with the outer wall of the driven sprocket 10, and the inner wall of the drive chain 15 meshes with the outer wall of the driven sprocket 10.

[0030] In the above structure, a transmission chain 15 is provided on the outer wall of the drive sprocket 8, and the two ends of the outer wall of the transmission chain 15 are connected to the outer walls of the drive sprocket 8 and the driven sprocket 10 respectively. When the drive rod 3 rotates, the drive sprocket 8 will rotate with the drive rod 3. Then, under the action of the transmission chain 15, the power is transmitted to the outer wall of the transmission rod 9, so that the transmission rod 9 and the drive rod 3 rotate synchronously. This drives the moving block 4 on the outer wall of the transmission rod 9 and the drive rod 3, thereby lifting the lifting plate 7.

[0031] In a preferred embodiment: the outer wall of the connecting plate 6 away from the support plate 5 is rotatably connected to the outer wall of the moving block 4, and the top of the lifting plate 7 is provided with a moving hole, and the inner wall shape of the moving hole matches the outer wall shape of the lifting plate 14.

[0032] In the above structure, the drive screw 13 is driven to rotate by the drive motor 12 through the moving hole opened at the top of the lifting plate 7. During the rotation of the drive screw 13, the lifting plate 14 is driven, so that the lifting plate 14 moves upward along the inner cavity of the support frame 11, so that the lifting plate 14 rises from the bottom of the lifting plate 7 and moves upward.

[0033] In a preferred embodiment, the inner cavity of the lifting frame 11 is provided with a moving groove, and the inner wall shape of the moving groove matches the outer wall shape of the lifting plate 14.

[0034] In the above structure, the drive screw 13 is rotated by the drive motor 12 through the moving groove opened in the inner cavity of the lifting frame 11, thereby causing the lifting plate 14 to move upward in the moving groove, thereby lifting the product on the top of the lifting plate 7 and preventing the product from sticking to the bottom of the lifting plate 7 after cooling.

[0035] In a preferred embodiment, the inner cavity of the lifting plate 14 is provided with an internal thread, and the inner wall thread of the lifting plate 14 meshes with the outer wall thread of the drive screw 13.

[0036] In the above structure, the outer wall of the drive screw 13 meshes with the inner wall of the lifting plate 14 through the internal thread on the inner wall of the lifting plate 14, so that the lifting plate 14 moves upward along the inner cavity of the lifting frame 11 under the drive of the drive motor 12 and the drive screw 13, and demolds the product on the top of the lifting plate 7.

[0037] In a preferred embodiment, there are two lifting frames 11, and the two lifting frames 11 are respectively installed on both sides of the bottom of the lifting plate 7.

[0038] In the above structure, by providing two lifting frames 11 on both sides of the bottom of the lifting plate 7, the lifting plate 14 can be restricted under the action of the two lifting frames 11, so that the lifting plate 14 can only move upward under the drive of the drive motor 12 and the drive screw 13, thereby demolding the product on the top of the lifting plate 7.

[0039] Working principle: During the use of the above equipment, injection molding is performed in the inner cavity of the product mold 2 to prepare the product. When the product needs to be demolded after cooling, the drive rod 3 is rotated. Under the drive of the drive rod 3, the moving blocks 4 on both sides move along the outer wall of the drive rod 3. In this process, the moving blocks 4 adjust the angle between the outer walls of the support plate 5 and the connecting plate 6, thereby lifting the lifting plate 7 upward. The lifting plate 7 lifts the product in the inner cavity of the product mold 2 for demolding, so that the product rises in the inner cavity of the product mold 2. Then, the drive motor 12 is started. Under the action of the drive motor 12, the lifting plate 14 moves upward along the inner cavity of the support frame 11, so that the lifting plate 14 lifts the product on the top of the lifting plate 7 again, preventing the bottom of the product from sticking to the top of the lifting plate 7, and better realizing the ejection and demolding of the product.

[0040] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ejection mechanism for an injection mold, comprising a base (1), characterized in that: A product mold (2) is mounted on the top of the base (1). A drive rod (3) is rotatably connected to the inner cavity of the base (1). A moving block (4) is threadedly connected to the outer wall of the drive rod (3). A support plate (5) is rotatably connected to the outer wall of the moving block (4). A connecting plate (6) is rotatably connected to the outer wall of the support plate (5). A lifting plate (7) is rotatably connected to the outer wall of the connecting plate (6). A drive sprocket (8) is fixedly mounted on the outer wall of the drive rod (3). A transmission rod (9) is rotatably connected to the inner cavity. A driven sprocket (10) is fixedly mounted on the outer wall of the transmission rod (9). A lifting frame (11) is fixedly mounted on the bottom of the lifting plate (7). A lifting plate (14) is movably sleeved in the inner cavity of the lifting frame (11). A drive motor (12) is fixedly mounted on the bottom of the lifting plate (7). A drive screw (13) is fixedly mounted on the power output shaft of the drive motor (12). A transmission chain (15) is meshed on the outer wall of the drive sprocket (8).

2. The ejection mechanism for an injection mold according to claim 1, characterized in that: Both ends of the outer wall of the drive rod (3) are provided with external threads, and the threads on the outer walls of the two ends of the drive rod (3) are in opposite directions.

3. The ejection mechanism for an injection mold according to claim 2, characterized in that: The outer wall of the movable block (4) is fitted with a limiting plate, and the inner cavity of the base (1) is provided with a limiting groove, and the inner wall shape of the limiting groove matches the outer wall shape of the limiting plate.

4. The ejection mechanism for an injection mold according to claim 1, characterized in that: The outer wall of the transmission chain (15) away from the drive sprocket (8) is rolledly connected to the outer wall of the driven sprocket (10), and the inner wall of the transmission chain (15) meshes with the outer wall of the driven sprocket (10).

5. The ejection mechanism for an injection mold according to claim 4, characterized in that: The outer wall of the connecting plate (6) away from the support plate (5) is rotatably connected to the outer wall of the moving block (4). The top of the lifting plate (7) is provided with a moving hole, and the inner wall shape of the moving hole matches the outer wall shape of the lifting plate (14).

6. The ejection mechanism for an injection mold according to claim 1, characterized in that: The inner cavity of the lifting frame (11) is provided with a moving groove, and the inner wall shape of the moving groove matches the outer wall shape of the lifting plate (14).

7. The ejection mechanism for an injection mold according to claim 1, characterized in that: The inner cavity of the lifting plate (14) is provided with an internal thread, and the inner wall thread of the lifting plate (14) meshes with the outer wall thread of the drive screw (13).

8. The ejection mechanism for an injection mold according to claim 1, characterized in that: There are two lifting frames (11), and the two lifting frames (11) are respectively installed on both sides of the bottom of the lifting plate (7).

Images