Injection mold and secondary ejection mechanism thereof

Abstract

This utility model discloses an injection mold and its secondary ejection mechanism, including a first ejector plate assembly, a second ejector plate assembly, a locking mechanism assembly, a support plate, a floating plate, a moving mold core, and an insert for core pulling. The first ejector plate assembly includes a first ejector plate and a first ejector pin for ejecting the runner. The second ejector plate assembly includes a second ejector plate and a second ejector pin for ejecting the injection molded part. The locking mechanism assembly includes a limiting block, a pull bar, and a movable block that can be elastically extended and retracted. The limiting block is fixed to the support plate and has a first inclined surface. The movable block has a second inclined surface. The first inclined surface can slide against the second inclined surface. The pull bar is fixed to the second ejector plate and has an abutment step. Only when the movable block elastically extends out of the floating plate does the abutment step abut against the movable block. In this way, the runner can be ejected first, then the core can be pulled, and finally the injection molded part can be ejected with only two sets of ejector plates. The overall structure is relatively simple, the mold cost is low, and the production efficiency is guaranteed.

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 mechanism. Background Technology

[0002] Currently, many injection molded products are small in size, thin in wall thickness, deep in the ribs and have many through holes. Therefore, there is little space to place ejector pins in the injection mold. If the core is pulled out first and then the runner is ejected, the runner at the core pulling point will be broken. However, if the runner is ejected first and then the core is pulled out, and then the injection molded product is ejected, at least 3 sets of ejector plates and other related matching mechanisms are required. Such a structure is complex, the mold assembly time is long and the mold cost is high, and it also seriously affects the production efficiency. Utility Model Content

[0003] To address the aforementioned problems, this invention provides an injection mold and its secondary ejection mechanism, which requires only two sets of ejector plates to first eject the runner, then pull the core, and finally eject the injection molded part. The overall structure is relatively simple, the mold cost is low, and production efficiency is guaranteed.

[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 mechanism for an injection mold, including a first ejector plate assembly, a second ejector plate assembly, a fastening assembly, a support plate, a floating plate, a moving mold core disposed on the floating plate, and an insert for core pulling and assembled on the support plate; the first ejector plate assembly includes a first ejector plate for connecting to an ejector roller and a first ejector pin for ejecting the runner; the second ejector plate assembly includes a second ejector plate disposed between the support plate and the first ejector plate and a second ejector pin for ejecting the injection molded part; the floating plate is disposed on the side of the support plate opposite to the second ejector plate, and the floating plate is movable relative to the support plate; the insert is movably inserted into the support plate. The floating plate and the moving mold core extend into the cavity of the injection mold; the fastening assembly includes a limiting block, a pull bar, and a movable block that can be elastically extended and retracted on the floating plate; one end of the limiting block is fixedly connected to the outer wall of the support plate, and the other end is provided with a first inclined surface; the movable block is provided with a second inclined surface that cooperates with the first inclined surface, and the first inclined surface can slide against the second inclined surface; one end of the pull bar is fixedly connected to the outer wall of the second ejector plate, and the other end is provided with an abutting step; and only when the movable block elastically extends out of the floating plate, the abutting step of the pull bar abuts against the movable block, so that the second ejector plate and the floating plate are arranged to move synchronously.

[0006] Furthermore, the fastening assembly also includes a mounting box, which has limiting grooves extending through its upper and lower surfaces. The end of the limiting block facing away from the support plate and the end of the pull strip facing away from the second ejector plate are respectively limited by the limiting grooves.

[0007] Furthermore, the outer wall of the floating plate is provided with a mounting groove to accommodate the movable block, the movable block is movably inserted into the mounting groove, and a spring is provided between the movable block and the groove wall of the mounting groove.

[0008] Furthermore, the movable block is provided with a guide through hole, and the guide through hole is equipped with a limiting member. One end of the limiting member is movably inserted through the guide through hole and fixedly connected to the groove wall of the mounting groove, and the outer diameter of the other end of the limiting member is larger than the diameter of the guide through hole.

[0009] Furthermore, when the first ejector plate abuts against the second ejector plate, the first ejector plate and the second ejector plate are configured to move synchronously; the first ejector pin is movably inserted through the second ejector plate, the support plate, the floating plate and the moving mold core; the second ejector pin is movably inserted through the support plate, the floating plate and the moving mold core.

[0010] This utility model provides an injection mold, which includes at least the aforementioned secondary ejection mechanism.

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

[0012] Through the joint cooperation of the first ejector plate assembly, the second ejector plate assembly, the fastening assembly, the support plate, the floating plate, and the insert, the flow channel is ejected first, the core is pulled out, and then the injection molded part is ejected, all with only two sets of ejector plates. The overall structure is relatively simple, the mold cost is low, and the production efficiency is guaranteed. Attached Figure Description

[0013] Figure 1 The figure shown is a cross-sectional view of the first position of the secondary ejection mechanism of the injection mold in Embodiment 1.

[0014] Figure 2 The figure shown is a cross-sectional view of the second position of the secondary ejection mechanism of the injection mold in Embodiment 1;

[0015] Figure 3 The diagram shown is an assembly diagram of the fastening assembly in Embodiment 1;

[0016] Figure 4 The figure shown is a cross-sectional view of the third position of the secondary ejection mechanism of the injection mold in Embodiment 1.

[0017] Figure 5 As shown Figure 4 A magnified view of area A in the middle. 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 5 Embodiment 1 provides a secondary ejection mechanism for an injection mold (hereinafter referred to as the secondary ejection mechanism), including a first ejector plate assembly 1, a second ejector plate assembly 2, a fastening assembly 3, a support plate 4, a floating plate 5, a moving mold core 6 disposed on the floating plate 5, and an insert 7 for core pulling and assembled on the support plate 4, wherein, as Figure 2 The first ejector plate assembly 1 shown includes a first ejector plate 11 for connecting the ejector roller 8 and a first ejector pin 12 for ejecting the flow channel 9, as shown. Figure 1 The second ejector plate assembly 2 shown includes a second ejector plate 21 disposed between the support plate 4 and the first ejector plate 11, and a second ejector pin 22 for ejecting the injection molded part. The first ejector pin 12 is movably inserted through the second ejector plate 21, the support plate 4, the floating plate 5, and the moving mold core 6. The second ejector pin 22 is movably inserted through the support plate 4, the floating plate 5, and the moving mold core 6. The fastening assembly 3 includes a mounting box 35, a limiting block 31, a pull strip 32, and a movable block 33 that is elastically and telescopically disposed on the floating plate 5. Figure 1 The insert 7 shown is movably inserted through the floating plate 5 and the moving mold core 6 and extends into the cavity of the injection mold to facilitate core pulling.

[0022] The floating plate 5 is located on the upper side of the support plate 4 away from the second ejector plate 21. The support plate 4 is fixed, while the floating plate 5 is movable up and down relative to the support plate 4.

[0023] like Figures 3 to 5As shown, the lower end of the limiting block 31 is fixedly connected to the outer wall of the support plate 4, that is, the limiting block 31 is also fixed. The upper end of the limiting block 31 is provided with a first inclined surface 311, and the movable block 33 is provided with a second inclined surface 331 that cooperates with the first inclined surface 311. The lower end of the pull bar 32 is fixedly connected to the outer wall of the second ejector plate 21. The upper end of the pull bar 32 is provided with an abutting step 321, and the mounting box 35 has a limiting groove 351 that penetrates its upper and lower surfaces. The upper ends of the limiting block 31 and the pull bar 32 are respectively limited by the limiting groove 351 to ensure that their movement trajectory direction is parallel to the vertical direction.

[0024] When the mold opens, driven by the ejector roller 8, the first ejector plate 11 pushes upward for the first stroke (e.g., 14mm) and then begins to push against the second ejector plate 21 and push upward together synchronously. At this time, the movable block 33 extends elastically out of the floating plate 5, and the abutting step 321 of the pull bar 32 abuts against the lower end of the movable block 33. Therefore, the second ejector plate 21 drives the movable block 33 and the floating plate 5 together to push upward for the second stroke (e.g., 5mm) through the pull bar 32. At the same time, the second inclined surface 331 slides a corresponding distance on the first inclined surface 311. After that, the movable block 33 is pressed back into the floating plate 5, and the pull bar 32 and the movable block 33 no longer abut against each other. The floating plate 5 stops moving upward, and only the first ejector plate 11 and the second ejector plate 21 continue to push upward for the third stroke (e.g., 20mm).

[0025] In this embodiment, as Figures 3 to 5 As shown, the outer wall of the floating plate 5 is provided with a mounting groove 51 for accommodating the movable block 33. The movable block 33 is movably inserted into the mounting groove 51. A spring 34 is provided between the movable block 33 and the groove wall of the mounting groove 51. The movable block 33 is provided with a guide hole 332. The guide hole 332 is equipped with a limiting member 36 (such as a limiting pin). The inward end of the limiting member 36 can movably pass through the guide hole 332 and be fixedly connected to the groove wall of the mounting groove 51. The outer diameter of the outward end of the limiting member 36 is larger than the diameter of the guide hole 332 to ensure that the movable block 33 will not detach from the mounting groove 51, and at the same time limit the elastic extension and contraction stroke of the movable block 33.

[0026] When the first ejector plate 11 is driven upward by the ejector roller 8 to push out the first stroke, the first ejector 12 also pushes out the flow channel 9. Then, the first ejector plate 11 begins to abut against the second ejector plate 21 located above, and pushes the second ejector plate 21 upward together to push out the second stroke. The pull bar 32 moves upward synchronously with the second ejector plate 21 to the second stroke. The floating plate 5 also moves upward to the second stroke through the pull bar 32 and the movable block 33. At the same time, the insert 7 completes the core pulling and separation, and in the second stroke, it passes through the first inclined plane 3. The sliding engagement between the first ejector plate 11 and the second inclined plate 331 overcomes the elasticity limitation of the spring 34, and the movable block 33 is pressed back into the mounting groove 51 of the floating plate 5. The pull bar 32 and the movable block 33 no longer abut against each other, that is, the floating plate 5 stops moving upward. Then, only the first ejector plate 11 and the second ejector plate 21 continue to push upward for the third stroke under the drive of the ejector roller 8. The second ejector 22 pushes out the injection molded part, and the first ejector 12 and the runner 9 also continue to move upward during the second and third strokes. Finally, the runner 9 and the injection molded part are taken out.

[0027] Through the joint cooperation of the first ejector plate assembly 1, the second ejector plate assembly 2, the fastener assembly 3, the support plate 4, the floating plate 5 and the insert 7, the flow channel 9 is ejected first, the core is pulled out, and then the injection molded part is ejected, with only two sets of ejector plates required. The overall structure is relatively simple, the mold cost is low, and the production efficiency is guaranteed.

[0028] Example 2

[0029] Example 2 provides an injection mold that includes at least the secondary ejection mechanism of Example 1.

[0030] 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 mechanism for an injection mold, characterized in that: It includes a first ejector plate assembly, a second ejector plate assembly, a fastening assembly, a support plate, a floating plate, a moving mold core disposed on the floating plate, and an insert for core pulling and assembled on the support plate; The first ejector plate assembly includes a first ejector plate for connecting to the top roller and a first ejector pin for ejecting the flow channel; The second ejector plate assembly includes a second ejector plate disposed between the support plate and the first ejector plate, and a second ejector pin for ejecting the injection molded part; The floating plate is disposed on the side of the support plate opposite to the second ejector plate, and the floating plate is movable relative to the support plate; The insert is movably inserted through the floating plate and the moving mold core, and extends into the cavity of the injection mold; The fastening assembly includes a limiting block, a pull bar, and a movable block that can be elastically extended and retracted on the floating plate. One end of the limiting block is fixedly connected to the outer wall of the support plate, and the other end is provided with a first inclined surface. The movable block is provided with a second inclined surface that cooperates with the first inclined surface, and the first inclined surface can slide against the second inclined surface. One end of the pull bar is fixedly connected to the outer wall of the second ejector plate, and the other end is provided with an abutting step. When the movable block elastically extends out of the floating plate, the abutting step of the pull bar abuts against the movable block, so that the second ejector plate and the floating plate are set to move synchronously.

2. The secondary ejection mechanism of the injection mold according to claim 1, characterized in that: The fastening assembly also includes a mounting box, which has limiting grooves extending through its upper and lower surfaces. The end of the limiting block facing away from the support plate and the end of the pull strip facing away from the second ejector plate are respectively limited by the limiting grooves.

3. The secondary ejection mechanism of the injection mold according to claim 1 or 2, characterized in that: The outer wall of the floating plate is provided with a mounting groove to accommodate the movable block. The movable block is movably inserted into the mounting groove, and a spring is provided between the movable block and the groove wall.

4. The secondary ejection mechanism of the injection mold according to claim 3, characterized in that: The movable block is provided with a guide through hole, and the guide through hole is equipped with a limiting member. One end of the limiting member is movably inserted through the guide through hole and fixedly connected to the groove wall of the mounting groove, and the outer diameter of the other end of the limiting member is larger than the diameter of the guide through hole.

5. The secondary ejection mechanism of the injection mold according to claim 1 or 2, characterized in that: When the first ejector plate abuts against the second ejector plate, the first ejector plate and the second ejector plate are configured to move synchronously; the first ejector pin is movably inserted through the second ejector plate, the support plate, the floating plate and the moving mold core; the second ejector pin is movably inserted through the support plate, the floating plate and the moving mold core.

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

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