Injection mold and secondary ejection return mechanism thereof

Abstract

The utility model discloses an injection mold and secondary ejection return mechanism thereof, including movable mould, top block, limit block, baffle and be used for the reset assembly of floating plate reset, top block fixed connection in the outside wall of floating plate, limit block fixed connection in the outside wall of support plate, the outside wall of thimble plate is provided with the installation groove of accommodating baffle, and baffle can be assembled in the installation groove of elastic expansion, and the side of top block to floating plate has the give -way slot of accommodating limit block, and one end of limit block away from support plate is provided with inclined plane, and limit block is set in give -way slot and is gap fit, and the part of inclined plane projects in the slot of give -way slot away from floating plate one end, only baffle stretches out installation groove, and baffle sliding abuts at inclined plane, and top abuts one end of top block away from floating plate, so not only can complete secondary ejection, but also can return floating plate in time, and whole structure is simple and production efficiency is high simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold and its secondary ejection and return mechanism. Background Technology

[0002] The injection molded parts have thin walls and deep ribs. When opening the mold, the core needs to be pulled out first, and then the injection molded parts need to be ejected. Before closing the mold again, the floating plate needs to return to its original position in time to place the insert of the next injection molded part. This requires two sets of ejector pins and ejector plates. However, there is little space in the injection mold to arrange the ejector pins, which makes the structure of the injection mold more complex, the mold cost higher, and the mold assembly time longer and the disassembly and assembly steps more numerous, resulting in low production efficiency. Utility Model Content

[0003] To address the aforementioned problems, this invention provides an injection mold and its secondary ejection and return mechanism, which not only completes secondary ejection but also promptly returns the floating plate. Furthermore, the overall structure is simple and the production efficiency is high.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] This utility model provides a secondary ejection and return mechanism for an injection mold, including a moving mold. The moving mold includes an insert, a support plate, ejector pins, an ejector plate, a floating plate, and a moving mold core disposed on the floating plate. The support plate is located between the floating plate and the ejector plate. The insert is fixedly connected to the support plate and movably passes through the floating plate and the moving mold core. The ejector pin is assembled to the ejector plate and movably passes through the support plate, the floating plate, and the moving mold core. The mechanism also includes an ejector block, a limiting block, a stop block, and a reset assembly for resetting the floating plate. The ejector block is fixedly connected to the outer wall of the floating plate. The limiting block is fixedly connected to the outer side wall of the support plate; the outer side wall of the ejector plate is provided with a mounting groove for accommodating the stop block, and the stop block is elastically and telescopically assembled in the mounting groove; the side of the top block facing the floating plate has a clearance groove for accommodating the limiting block, and the end of the limiting block away from the support plate is provided with an inclined surface; the limiting block is disposed in the clearance groove with clearance fit, and part of the inclined surface protrudes from the groove opening of the clearance groove away from the floating plate; when only the stop block extends out of the mounting groove, the stop block slides against the inclined surface and abuts against the end of the top block away from the floating plate.

[0006] Furthermore, the reset assembly includes a reset rod, a first spring, and a pad; one end of the reset rod can movably pass through the floating plate and the support plate and is fixedly connected to the pad, and the other end is assembled to the ejector plate; the first spring is disposed between the support plate and the ejector plate.

[0007] Furthermore, the floating plate has a receiving groove for accommodating the pad on the side opposite to the support plate, and the receiving groove has a one-way opening; the pad is disposed in the receiving groove and abuts against the bottom wall of the receiving groove.

[0008] Furthermore, a second spring is provided between the ejector plate and the stop block; the stop block is provided with a limit window, and a limit pin is fixedly connected to the groove wall of the mounting groove; the limit pin is slidably inserted into the limit window to limit the extension and retraction length of the stop block.

[0009] Furthermore, the clearance groove extends through to the end face of the limiting block away from the floating plate and the side face towards the floating plate, forming only two slots with different orientations.

[0010] This utility model provides an injection mold, which includes at least the secondary ejection and return mechanism of the injection mold described above.

[0011] The technical solution provided by this utility model has the following beneficial effects:

[0012] 1. When the mold is opened, the ejector plate first drives the ejector pin to push out a first distance in the direction of the fixed mold, and drives the top block and the floating plate to move synchronously through the stop block, so as to pull the insert inward, thereby achieving a deeper separation of the bone position.

[0013] 2. When the stop block moves toward the fixed mold direction, the stop block slides on the inclined surface of the limiting block to elastically press the stop block back into the mounting groove of the ejector plate. At this time, the stop block cannot abut against the ejector block. Therefore, the floating plate stops moving. At the same time, the ejector plate continues to drive the ejector pin to push out a second distance toward the fixed mold direction to eject and detach the molded injection part. Then, the reset assembly returns the ejector plate and the floating plate to their original positions for placing the insert of the next injection part.

[0014] 3. This utility model can not only complete the secondary ejection, but also return the floating plate in time. At the same time, the overall structure is simple and the production efficiency is high. Attached Figure Description

[0015] Figure 1 The figure shown is a cross-sectional view of the first position of the secondary ejection and return mechanism of the injection mold in Embodiment 1;

[0016] Figure 2 The diagram shown is a schematic representation of the connection between the top block, the limiting block, and the stop block in Embodiment 1.

[0017] Figure 3 The figure shown is a cross-sectional view of the second position of the secondary ejection and return mechanism of the injection mold in Embodiment 1. Detailed Implementation

[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] Reference Figures 1 to 3 Embodiment 1 provides a secondary ejection and return mechanism for an injection mold, including a moving mold 100. The moving mold 100 includes several inserts 1, several ejector pins 3, a support plate 2, an ejector plate 4, two ejector blocks 7, two limit blocks 8, two stop blocks 9, a floating plate 5, a moving mold core 6 disposed on the floating plate 5, and a reset assembly 10 for resetting the floating plate 5. The support plate 2 is located between the floating plate 5 and the ejector plate 4, and the support plate 2 is fixed.

[0022] like Figure 3 As shown, insert 1 is fixedly connected to support plate 2 and movably passes through floating plate 5 and moving mold core 6. Ejector pin 3 is assembled to ejector plate 4 and movably passes through support plate 2, floating plate 5 and moving mold core 6. Of course, the arrangement structure of insert 1 and ejector pin 3 is prior art and will not be described in detail here.

[0023] In this embodiment, as Figure 1 and Figure 3 As shown, the reset assembly 10 includes a reset rod 101, a first spring 102, and a pad 103. The upper end of the reset rod 101 movably passes through the floating plate 5 and the support plate 2 and is fixedly connected to the pad 103. The lower end of the reset rod 101 is assembled to the ejector plate 4. The first spring 102 is disposed between the support plate 2 and the ejector plate 4 to provide a rebound force or tension for the timely return of the floating plate 5. Specifically, the top of the floating plate 5 away from the support plate 2 is provided with a receiving groove 51 for accommodating the pad 103. The receiving groove 51 has an upward-facing one-way opening. The pad 103 is disposed in the receiving groove 51 and abuts against the bottom wall of the receiving groove 51 to ensure that the ejector plate 4 drives the floating plate 5 back to its original position by the reset rod 101.

[0024] When the ejector plate 4 is ejected in the direction of the fixed mold, the distance between the ejector plate 4 and the support plate 2 gradually decreases, that is, the first spring 102 is continuously compressed and a rebound force is formed.

[0025] When the ejector plate 4 is no longer subjected to the external force applied by the top roller of the injection molding machine, the ejector plate 4 is pushed back to the initial position in time by the elastic force of the first spring 102. Simultaneously, the ejector plate 4 drives the floating plate 5 back to the initial position through the reset rod 101, so as to facilitate the placement and positioning of the insert of the next injection molded part.

[0026] More specifically, such as Figure 1 and Figure 2 As shown, the upper end of the top block 7 is fixedly connected to the outer wall of the floating plate 5 by screws, and the upper end of the limiting block 8 is fixedly connected to the outer wall of the support plate 2 by screws.

[0027] The outer wall of the ejector plate 4 is provided with an installation groove 41 for accommodating the stop block 9. The stop block 9 can be elastically and telescopically assembled in the installation groove 41. Specifically, a second spring 11 is provided between the ejector plate 4 and the stop block 9. The stop block 9 is provided with a limiting window 91 that penetrates its upper and lower surfaces. The groove wall of the installation groove 41 is fixedly connected to a limiting pin 92. The limiting pin 92 is slidably inserted into the limiting window 91 to limit the extension length of the stop block 9 and ensure that the stop block 9 can be completely retracted into the installation groove 41.

[0028] The top block 7 has a clearance groove 71 on the inner side facing the floating plate 5 to accommodate the limiting block 8. The clearance groove 71 extends through to the lower end face of the limiting block 8 away from the floating plate 5 and the inner side facing the floating plate 5, forming only two slots with different orientations.

[0029] The limiting block 8 is provided with an inclined surface 81 at the lower end away from the support plate 2. The limiting block 8 is provided in the relief groove 71 with a clearance fit. Part of the inclined surface 81 protrudes from the groove of the relief groove 71 away from the opening of the floating plate 5. When only the stop block 9 extends out of the mounting groove 41, the stop block 9 slides against the inclined surface 81 and is used to overcome the elastic force limitation of the second spring 11 to push the stop block 9 back into the mounting groove 41. It also abuts against the top block 7 away from the lower end of the floating plate 5 and ensures that the stop block 9 and the top block 7 can move synchronously during the ejection process.

[0030] When the mold is opened, the ejector plate 4 first drives the ejector pin 3 to push out a first distance (e.g., 8mm) in the direction of the fixed mold, and drives the ejector block 7 and the floating plate 5 to move synchronously through the stop block 9, so as to pull the insert 1 inward, thereby achieving a deeper bone separation.

[0031] Next, as the ejector plate 4 and the stop block 9 continue to move toward the fixed mold direction, the stop block 9 slides on the inclined surface 81 of the limit block 8 to elastically press the stop block 9 back into the mounting groove 41 of the ejector plate 4. At this time, the stop block 9 can no longer abut against the ejector block 7, so the floating plate 5 stops moving. At the same time, the ejector plate 4 continues to drive the ejector pin 3 to push out a second distance (e.g., 25mm) toward the fixed mold direction to eject and detach the molded injection part. Then, the ejector plate 4 and the floating plate 5 are reset to their initial positions by the reset assembly 10 for placing and positioning the insert of the next injection part.

[0032] In summary, this embodiment not only enables secondary ejection but also timely return of the floating plate 5. Furthermore, the overall structure is simple, the mold assembly time is short, and the disassembly and assembly steps are few, thus ensuring high production efficiency.

[0033] Example 2

[0034] Example 2 provides an injection mold, which includes at least the secondary ejection and return mechanism of the injection mold in Example 1.

[0035] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A secondary ejection and return mechanism for an injection mold, comprising a movable mold, the movable mold including an insert, a support plate, an ejector pin, an ejector plate, a floating plate, and a movable mold core disposed on the floating plate, the support plate being located between the floating plate and the ejector plate, the insert being fixedly connected to the support plate and movably passing through the floating plate and the movable mold core, the ejector pin being assembled to the ejector plate and movably passing through the support plate, the floating plate, and the movable mold core, characterized in that: It also includes a top block, a limit block, a stop block, and a reset assembly for resetting the floating plate; The top block is fixedly connected to the outer side wall of the floating plate, and the limiting block is fixedly connected to the outer side wall of the support plate; the outer side wall of the ejector plate is provided with a mounting groove for accommodating the stop block, and the stop block is elastically and telescopically assembled in the mounting groove; the side of the top block facing the floating plate has a clearance groove for accommodating the limiting block, and the end of the limiting block away from the support plate is provided with an inclined surface; the limiting block is disposed in the clearance groove with clearance fit, and a portion of the inclined surface protrudes from the groove opening at the end of the clearance groove away from the floating plate; When only the stop block extends out of the mounting groove, the stop block slides against the inclined surface and abuts against the end of the top block away from the floating plate.

2. The secondary ejection and return mechanism of the injection mold according to claim 1, characterized in that: The reset assembly includes a reset rod, a first spring, and a pad; one end of the reset rod can movably pass through the floating plate and the support plate and is fixedly connected to the pad, and the other end is assembled to the ejector plate; the first spring is disposed between the support plate and the ejector plate.

3. The secondary ejection and return mechanism of the injection mold according to claim 2, characterized in that: The floating plate has a receiving groove for accommodating the pad on the side opposite to the support plate, and the receiving groove has a one-way opening; the pad is disposed in the receiving groove and abuts against the bottom wall of the receiving groove.

4. The secondary ejection and return mechanism of the injection mold according to any one of claims 1-3, characterized in that: A second spring is provided between the ejector plate and the stop block; the stop block is provided with a limit window, and a limit pin is fixedly connected to the wall of the mounting groove; the limit pin is slidably inserted into the limit window to limit the extension and retraction length of the stop block.

5. The secondary ejection and return mechanism of the injection mold according to any one of claims 1-3, characterized in that: The clearance groove extends through to the end face of the limiting block away from the floating plate and the side face towards the floating plate, forming only two slots with different orientations.

6. An injection mold, characterized in that: It includes at least the secondary ejection and return mechanism of the injection mold as described in any one of claims 1-5.

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