Mould secondary ejection mechanism and material belt secondary ejection tool

Abstract

The utility model relates to the technical field of dies, in particular to a die secondary ejection mechanism and a material belt secondary ejection tool comprising the same, the die secondary ejection mechanism comprises a primary ejection plate assembly, a secondary ejection plate assembly, an ejection piece, a linkage assembly and an unlocking assembly, after the primary top plate assembly and the secondary top plate assembly synchronously move towards the mold due to locking of the linkage assembly and jointly eject out a material belt in the mold, at least part of the unlocking assembly overhangs into the linkage assembly to unlock the linkage assembly. The secondary ejector plate assembly and the primary ejector plate assembly are separated and then do opposite movement, so that a preset gap is formed between the area, where the injection molding part is formed, of the material belt and the free end of the primary ejector pin on the primary ejector plate assembly. According to the utility model, an injection molding part can be effectively prevented from colliding with the upper end of the primary ejector pin.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to a mold secondary ejection mechanism and a material strip secondary ejection fixture. Background Technology

[0002] For automated tape injection molding production of some insert molding parts, when the ejector pin completes ejection at the end of a molding cycle, the ejector pin and the product are in contact. When the tape moves forward again for the next molding cycle, the product and the ejector pin may scrape each other, causing damage to both. At this time, it is necessary to manually lift the tape to create a safe distance between the product and the ejector pin. The traditional demolding method that only ejects once cannot replace the manual automatic generation of the above-mentioned safe distance. Utility Model Content

[0003] This utility model provides a secondary ejection mechanism for a mold and a secondary ejection fixture for a strip, in order to solve the problem that existing technologies cannot replace manual methods to automatically generate a safe distance between the product and the ejector pin.

[0004] This utility model provides a secondary ejection mechanism for a mold, wherein a traveling material strip is provided inside the mold, and the mold is used to intermittently form injection molded parts on the traveling material strip. The secondary ejection mechanism includes:

[0005] A primary ejector plate assembly, wherein a primary ejector pin is provided on the primary ejector plate assembly, and the free end of the primary ejector pin can partially enter the mold and abut against the area where the material strip is formed of the injection molded part when the primary ejector plate assembly is driven.

[0006] A secondary ejector plate assembly is provided with a secondary ejector pin. The free end of the secondary ejector pin can partially enter the mold and abut against the area of ​​the unformed injection molded part of the material strip when the secondary ejector plate assembly is driven.

[0007] A pusher is used to drive the secondary top plate assembly to move toward or away from the mold.

[0008] A linkage component is disposed between the primary ejector assembly and the secondary ejector assembly. It is used to drive the primary ejector assembly to move synchronously toward the mold when the secondary ejector assembly moves toward the mold. After the free ends of the primary ejector pin and the secondary ejector pin enter the mold, they together push the strip upward.

[0009] An unlocking component, disposed on the mold, is used to at least partially extend into the linkage component during the synchronous movement of the primary ejector assembly and the secondary ejector assembly toward the mold to unlock the linkage component. After the secondary ejector assembly separates from the primary ejector assembly, it moves in opposite directions to create a predetermined gap between the area of ​​the material strip with the injection molded part and the free end of the primary ejector pin.

[0010] Optionally, the bottom of the mold is provided with a guide post, and the primary top plate assembly and the secondary top plate assembly are sequentially mounted on the outside of the guide post in the direction of their movement toward the mold, and both the primary top plate assembly and the secondary top plate assembly can slide freely along the guide post.

[0011] Optionally, the mold has a first through hole for the primary ejector pin and the secondary ejector pin to pass through, and the secondary ejector plate assembly has a second through hole for the primary ejector pin to pass through.

[0012] Optionally, after the linkage component is unlocked, the pusher continues to push the secondary top plate assembly to move so that a predetermined gap is created between the area of ​​the strip where the injection molded part is formed and the free end of the primary ejector pin.

[0013] Optionally, after the linkage component is unlocked, the secondary ejector plate assembly is held in the unlocked position by the pusher, and the primary ejector plate assembly moves away from the mold and returns to the initial position, so that a predetermined gap is generated between the area of ​​the strip with the injection molded part and the free end of the primary ejector pin.

[0014] Optionally, a positioning element is radially retractable inside the guide post, and the positioning element has a positioning end that protrudes from the outer wall of the guide post in its natural state; the primary top plate assembly has a through hole for fitting with the guide post, and the inner wall of the through hole is provided with a groove.

[0015] When the primary top plate assembly and the secondary top plate assembly are separated, the positioning end is embedded in the groove to position the primary top plate assembly, and the pushing member continues to push the secondary top plate assembly to move.

[0016] Alternatively, when the primary top plate assembly separates from the secondary top plate assembly, and the primary top plate assembly moves away from the mold and returns to its initial position, the positioning end is embedded in the groove to achieve positioning of the primary top plate assembly.

[0017] Optionally, the linkage component includes a retractable locking tongue disposed on the secondary top plate assembly and a locking hook disposed on the primary top plate assembly; the unlocking component includes an unlocking rod located on the movement trajectory of the locking tongue; the locking hook engages with the locking tongue to lock the secondary top plate assembly and the primary top plate assembly and achieve synchronous movement of both toward the mold; when the locking tongue reaches the end of the unlocking rod, the end of the unlocking rod pushes the locking tongue to retract it and releases the engagement with the locking hook, thereby unlocking the secondary top plate assembly and the primary top plate assembly; at least one of the locking tongue and the locking hook is provided with a locking ramp to facilitate the locking hook engaging with the locking tongue after passing over it; at least one of the ends of the locking tongue and the unlocking rod is provided with an unlocking ramp to facilitate the end of the unlocking rod pushing the locking tongue to retract it.

[0018] Optionally, the secondary ejector plate assembly includes a secondary pin plate and a secondary back plate that are sequentially arranged and fixedly connected in the direction of moving toward the mold. The secondary ejector pin is arranged on the secondary pin plate. The end face of the peripheral side of the secondary back plate is provided with a sliding groove extending inward. The locking tongue is slidably assembled in the sliding groove and one end extends out of the sliding groove. A return spring that elastically abuts against the locking tongue is also provided in the sliding groove.

[0019] The primary ejector plate assembly includes a primary pin plate and a primary back plate that are sequentially arranged and fixedly connected along the direction of mold movement. The primary ejector pin is arranged on the primary pin plate, and the locking hook is fixedly arranged at a corresponding position on the periphery of the primary pin plate.

[0020] This utility model also provides a secondary ejection fixture for a material strip, including a mold, a support base for supporting the mold, and a secondary ejection mechanism for the mold as described above. A traveling material strip is inserted into the mold, and the mold is used to intermittently form injection molded parts on the traveling material strip. The secondary ejection mechanism for the mold is located inside the support base.

[0021] Optionally, the mold includes an upper mold and a lower mold, and a feeding channel for the feeding belt is provided between the upper mold and the lower mold.

[0022] This utility model has the following beneficial effects:

[0023] In this design, the pusher pushes the secondary ejector plate assembly and drives the primary ejector plate assembly to move upward synchronously through the linkage assembly. At this time, the primary and secondary ejector pins eject the material strip simultaneously. When the pusher continues to push the secondary ejector plate assembly until the unlocking assembly unlocks the linkage assembly, the primary and secondary ejector plate assemblies can separate from each other. For example, the primary ejector plate assembly may remain stationary while the secondary ejector plate assembly continues to move upward, or the secondary ejector plate assembly may remain stationary while the primary ejector plate assembly moves downward and returns. This creates a predetermined gap between the area of ​​the material strip containing the injection molded part and the free end of the primary ejector pin, thereby effectively preventing the injection molded part from colliding with the upper end of the primary ejector pin.

[0024] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0026] Figure 1 A schematic diagram of a strip ejection fixture with a secondary ejection mechanism for the mold;

[0027] Figure 2 for Figure 1 A structural diagram from another perspective;

[0028] Figure 3 A schematic diagram of the secondary ejection fixture for the material strip after removing the support base and base;

[0029] Figure 4 for Figure 3 A structural diagram from another perspective;

[0030] Figure 5 This is a schematic diagram showing the relative positions of the lower mold, unlocking rod, and secondary ejector plate assembly in the secondary ejection mechanism of the mold.

[0031] Figure 6 This is a structural schematic diagram of the secondary roof slab assembly;

[0032] Figure 7 This is a schematic diagram of the assembly structure of the secondary backplate and locking hook;

[0033] Figure 8 This is a structural schematic diagram of a primary roof slab assembly;

[0034] Figure 9 This is a schematic diagram of the initial state of the secondary ejection mechanism of the mold;

[0035] Figure 10 This is a cross-sectional view of the mold's secondary ejection mechanism in its initial state.

[0036] Figure 11 This is a schematic diagram showing the relative positions of the lock hook, lock tongue, and unlocking lever when locked.

[0037] Figure 12 Schematic diagram of the exploded structure of the lock hook, lock tongue, and unlocking lever;

[0038] Figure 13 This is a schematic diagram of the secondary ejection mechanism of the mold in the secondary ejection state.

[0039] Figure 14 A schematic diagram showing the relative positions of the lock hook, lock tongue, and unlocking lever during unlocking;

[0040] Figure 15 This is a cross-sectional view of the mold's secondary ejection mechanism in the secondary ejection state.

[0041] Figure 16 This is a structural schematic diagram of the positioning component;

[0042] Figure 17 This is a schematic diagram of the material strip structure (the injection molding of the part has been completed).

[0043] The diagram is marked as follows:

[0044] 1. Mold; 11. Upper mold; 12. Lower mold; 121. First through hole; 13. Insertion channel;

[0045] 2. Support base; 21. Base;

[0046] 3. Material strip; 31. Traveling section; 32. Terminal; 33. Injection molded part;

[0047] 4. Conveyor track;

[0048] 5. Pushing component;

[0049] 6. Primary top plate assembly; 61. Primary needle plate; 62. Primary back plate; 63. Primary ejector pin; 64. First insertion hole; 641. First guide sleeve; 6411. Groove; 65. Locking hook;

[0050] 7. Secondary top plate assembly; 71. Secondary pin plate; 72. Secondary back plate; 73. Secondary ejector pin; 74. Secondary through hole; 741. Secondary guide sleeve; 75. Secondary through hole; 76. Locking tongue; 761. Unlocking ramp; 762. Locking ramp; 77. Slide groove; 78. Return spring;

[0051] 8. Unlock lever;

[0052] 9. Guide post; 91. Positioning component; 911. Housing; 612. Steel ball. Detailed Implementation

[0053] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0054] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0055] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0056] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0057] like Figure 1-17As shown, an embodiment of this utility model provides a secondary ejection mechanism for a mold. For the mold 1, a traveling material strip 3 is provided inside the mold 1. The mold 1 is used to intermittently form injection molded parts 33 on the traveling material strip 3. The mold 1 includes an upper mold 11 and a lower mold 12, with a feeding channel 13 for the material strip 3 to pass through between the upper mold 11 and the lower mold 12. In this embodiment, the material strip 3 includes a traveling portion 31 and multiple terminals 32 arranged on the traveling portion 31. The terminals 32 have areas to be injected, and the injection molded part 33 is formed on the areas to be injected. For the secondary ejection mechanism, the secondary ejection mechanism includes:

[0058] A primary ejector plate assembly 6 is provided with a primary ejector pin 63. The free end of the primary ejector pin 63 can partially enter the mold 1 and abut against the area of ​​the material strip 3 where the injection molded part 33 is formed, such as the area where the injection molded part 33 is formed on the terminal 32 mentioned above. When ejecting, the primary ejector pin 63 directly pushes the injection molded part 33.

[0059] The secondary ejector plate assembly 7 is provided with a secondary ejector pin 73. When the secondary ejector plate assembly 7 is driven, the free end of the secondary ejector pin 73 can partially enter the mold 1 and abut against the area of ​​the unformed injection molded part 33 of the material strip 3. This area is like the traveling part 31 of the material strip 3. When pushing, the secondary ejector pin 73 directly pushes the traveling part 31.

[0060] The pusher 5 is used to drive the secondary top plate assembly 7 to move toward or away from the mold 1. Specifically, linear telescopic devices such as cylinders or electric telescopic rods can be selected.

[0061] The linkage component is located between the primary ejector plate assembly 6 and the secondary ejector plate assembly 7. When the secondary ejector plate assembly 7 moves toward the mold 1, it drives the primary ejector plate assembly 6 to move synchronously toward the mold 1. After the free ends of the primary ejector pin 63 and the secondary ejector pin 73 enter the mold 1, they together push the molded strip 3 upward.

[0062] The unlocking component, set on the mold 1, is used to at least partially extend into the linkage component during the synchronous movement of the primary ejector assembly 6 and the secondary ejector assembly 7 toward the mold 1, thereby unlocking the linkage component. After the secondary ejector assembly 7 separates from the primary ejector assembly 6, it moves in opposite directions to create a predetermined gap between the area of ​​the strip 3 where the injection molded part 33 is formed and the free end of the primary ejector pin 63. This creates a predetermined gap between the injection molded part 33 and the free end of the primary ejector pin 63, preventing the primary ejector pin 63 from scratching the injection molded part 33.

[0063] In this scheme, the pusher 5 pushes the secondary top plate assembly 7 and drives the primary top plate assembly 6 to move upward synchronously through the linkage assembly. At this time, the primary ejector pin 63 and the secondary ejector pin 73 eject the material strip 3 synchronously. When the pusher 5 continues to push the secondary top plate assembly 7 until the unlocking assembly unlocks the linkage assembly, the primary top plate assembly 6 and the secondary top plate assembly 7 can separate from each other, thereby creating a predetermined gap between the area of ​​the material strip 3 where the injection molded part 33 is formed and the free end of the primary ejector pin 63, which can effectively prevent the injection molded part 33 from colliding with the upper end of the primary ejector pin 63.

[0064] Furthermore, in order to ensure stable movement of the primary top plate assembly 6 and the secondary top plate assembly 7, such as... Figure 3 , 4 As shown in Figures 9, 10, 13, and 15, in this embodiment, a guide post 9 is provided at the bottom of the mold 1. Specifically, the guide post 9 is fixed at the lower end of the lower mold 12. The primary top plate assembly 6 and the secondary top plate assembly 7 are sequentially mounted on the outside of the guide post 9 in the direction in which they move toward the mold 1. Both the primary top plate assembly 6 and the secondary top plate assembly 7 can slide freely along the guide post 9. The primary top plate assembly 6 and the secondary top plate assembly 7 are respectively provided with a first through hole 64 and a second through hole 74 that cooperate with the guide post 9.

[0065] To accommodate the pushing motion of the primary ejector pin 63 and the secondary ejector pin 73, such as Figure 5-7 As shown, in this embodiment, the mold 1 specifically has a first through hole 121 on the lower mold 12 for the primary ejector pin 63 and the secondary ejector pin 73 to pass through, and a second through hole 75 on the secondary ejector plate assembly 7 for the primary ejector pin 63 to pass through. When the primary ejector plate assembly 6 and the secondary ejector plate assembly 7 are in the non-ejected state, the free ends of the primary ejector pin 63 and the secondary ejector pin 73 are both located in the first through hole 121. When the primary ejector plate assembly 6 and the secondary ejector plate assembly 7 are in the ejected state, the free ends of the primary ejector pin 63 and the secondary ejector pin 73 both pass through the first through hole 121 and eject the material strip 3.

[0066] As a secondary pushing method, in this embodiment, after the linkage component is unlocked, the primary top plate component 6 remains in the unlocked position. At this time, the pusher 5 continues to push the secondary top plate component 7 to move so that a predetermined gap is generated between the area of ​​the material strip 3 where the injection molded part 33 is formed and the free end of the primary ejector pin 63.

[0067] Specifically, in order to ensure that the primary top plate assembly 6 can effectively maintain its position and can smoothly drive the primary top plate assembly 6 back when the secondary top plate assembly 7 returns, such as... Figure 10 , 15As shown in Figure 16, in this embodiment, a positioning member 91 is radially retractable inside the guide post 9, and the positioning member 91 has a positioning end that protrudes from the outer wall of the guide post 9 in its natural state; the primary top plate assembly 6 has a first through hole 64 for fitting with the guide post 9, and a groove 6411 is provided on the inner wall of the first through hole 64.

[0068] When the primary top plate assembly 6 separates from the secondary top plate assembly 7, the positioning end of the positioning member 91 is embedded in the groove 6411 to achieve positioning of the primary top plate assembly 6, and the pushing member 5 continues to push the secondary top plate assembly 7 to move.

[0069] like Figure 10 , 15 As shown in Figure 16, in this embodiment, the positioning element 91 includes a housing 911 and a spring and a steel ball 612 inserted inside the housing 911. The steel ball 612 partially protrudes from the housing 911, and can retract into the housing 911 under force. After the force is released, it can partially protrude again from the housing 911 under the push of the spring. The protruding portion of the steel ball 612 constitutes the aforementioned positioning end. The housing 911 is threaded externally, so the positioning element 91 can be threadedly connected to a pre-set threaded hole in the guide post 9. In this embodiment, the protruding portion of the steel ball 612 also protrudes from the outer surface of the guide post 9. Obviously, those skilled in the art will understand and know that the positioning element 91 can be a conventional ball screw, also known as a positioning ball. Of course, other existing devices or mechanisms that can be directly used to realize the action and function of the positioning element 91 can also be used as the positioning element 91, which will not be listed or described here.

[0070] In addition, considering stable sliding fit and processing technology, both the primary top plate assembly 6 and the secondary top plate assembly 7 are provided with through holes, namely the first through hole 64 and the second through hole 74. Each through hole is fixedly provided with a guide sleeve, namely the first guide sleeve 641 and the second guide sleeve 741. Each guide sleeve is through-connected to the guide post 9 and is in sliding fit. The guide sleeve of the primary top plate assembly 6, namely the first guide sleeve 641, is provided with the aforementioned groove 6411 on its inner wall. When the protruding part of the steel ball 612 engages with the groove 6411, it positions the primary top plate assembly 6. When the primary top plate assembly 6 is driven, the protruding part of the steel ball 612 is pushed by the groove opening of the groove 6411 and retracts to release the engagement with the groove 6411, so that the primary top plate assembly 6 can move again.

[0071] like Figure 3-14 As shown, in this embodiment, the linkage component includes a retractable locking tongue 76 disposed on the secondary top plate component 7 and a locking hook 65 disposed on the primary top plate component 6, and the unlocking component includes an unlocking rod 8 located on the movement trajectory of the locking tongue 76.

[0072] The locking hook 65 engages with the locking tongue 76 to lock the secondary top plate assembly 7 and the primary top plate assembly 6 and enable them to move synchronously toward the mold 1.

[0073] The unlocking rod 8 is fixedly connected to the lower mold 12 and its end extends toward the locking tongue 76. When the locking tongue 76 reaches the end of the unlocking rod 8, the end of the unlocking rod 8 pushes the locking tongue 76 to retract it and release the engagement with the locking hook 65, so that the secondary top plate assembly 7 and the primary top plate assembly 6 are unlocked.

[0074] In this embodiment, at least one of the latch 76 and the hook 65 is provided with a locking ramp 762 to facilitate the hook 65 to engage with the latch 76 after passing over it. In this embodiment, both the latch 76 and the hook 65 are provided with locking ramps 762. At least one of the ends of the latch 76 and the unlocking rod 8 is provided with an unlocking ramp 761 to facilitate the end of the unlocking rod 8 to push the latch 76 back. In this embodiment, both the end of the unlocking rod 8 and the latch 76 are provided with unlocking ramps 761. Furthermore, there are two engagement points between the hook 65 and the latch 76, located on both sides of the unlocking position.

[0075] like Figure 5-7 As shown, in this embodiment, the secondary top plate assembly 7 includes a secondary pin plate 71 and a secondary back plate 72 that are sequentially arranged and fixedly connected along the direction of movement toward the mold 1, and a secondary ejector pin 73 is arranged on the secondary pin plate 71.

[0076] The secondary backplate 72 has an inwardly extending groove 77 on its peripheral end face. The locking tongue 76 is slidably fitted into the groove 77, and one end of it, which is engaged with the locking hook 65, extends out of the groove 77. A return spring 78 is also provided in the groove 77, which elastically abuts against the locking tongue 76. Figure 7 As shown, in this embodiment, since the secondary back plate 72 also needs to be fixedly connected to the conveying track 4, the end face of the secondary back plate 72 with the groove 77 actually extends outward by a predetermined distance to facilitate a stable connection with the conveying track 4. In this embodiment, the groove 77 is essentially a groove-shaped structure dug downward from the upper end face of the secondary back plate 72. The outer end of the groove-shaped structure penetrates the secondary back plate 72 downward so that the locking hook 65 can pass upward through the secondary back plate 72 and engage with the locking tongue 76.

[0077] like Figure 8 As shown, in this embodiment, the primary top plate assembly 6 includes a primary needle plate 61 and a primary back plate 62 that are sequentially arranged and fixedly connected in the direction of movement toward the mold 1, a primary ejector pin 63 is arranged on the primary needle plate 61, and a locking hook 65 is fixedly arranged at a corresponding position on the periphery of the primary needle plate 61.

[0078] The specific operation process of the secondary ejection mechanism of this mold can be divided into the following steps:

[0079] 1. The injection molding process is carried out in mold 1. The primary ejector plate assembly 6 and the secondary ejector plate assembly 7 are both in the non-ejected position. The primary ejector plate assembly 6 and the secondary ejector plate assembly 7 are locked by locking tongue 76 and locking hook 65 and can be linked in the direction of downward mold 12.

[0080] 2. After injection molding is completed, the upper mold 11 of mold 1 opens upward. At this time, the ejector 5 can push the secondary ejector plate assembly 7 close to the lower mold 12, and the primary ejector plate assembly 6 simultaneously approaches the lower mold 12. When the locking tongue 76 contacts the end of the unlocking rod 8, the primary ejector pin 63 and the secondary ejector pin 73 together push the material strip 3 out of the lower mold 12, completing the first ejection.

[0081] Third, the pusher 5 continues to push the secondary ejector plate assembly 7, and the end of the unlocking rod 8 pushes the locking tongue 76 to unlock it from the locking hook 65, so that the primary ejector plate assembly 6 and the secondary ejector plate assembly 7 are unlocked in linkage. The primary ejector plate assembly 6 is held in the unlocked position under the positioning of the positioning member 91. The secondary ejector plate assembly 7 continues to approach the lower mold 12, and the secondary ejector pin 73 continues to push the area of ​​the material strip 3 where the injection molded part 33 is not formed. The material strip 3 is pushed and continues to move, so that a predetermined gap is created between the area of ​​the material strip 3 where the injection molded part 33 is formed and the free end of the primary ejector pin 63, thus completing the secondary ejection.

[0082] 4. As the material strip 3 moves, it moves the already injected material strip 3 out of the mold 1 and simultaneously moves the material strip 3 to be injected into the mold 1. At this time, the pusher 5 drives the secondary ejector plate assembly 7 to move back. When the secondary ejector plate assembly 7 contacts the primary ejector plate assembly 6, the secondary ejector plate assembly 7 drives the primary ejector plate assembly 6 to move back synchronously. At this time, the positioning member 91 is forced to release the positioning of the primary ejector plate assembly 6, and the locking tongue 76 extends again and locks with the locking hook 65 again until both the primary ejector plate assembly 6 and the secondary ejector plate assembly 7 return to the un-ejected position.

[0083] 5. The upper mold 11 and lower mold 12 of mold 1 are closed to proceed to the next injection molding process.

[0084] In other embodiments, as another secondary ejection method, after the linkage component is unlocked, the secondary ejector plate assembly is held in the unlocked position by the ejector component. The primary ejector plate assembly uses its own gravity to move away from the mold and return to its initial position, i.e., the non-ejected position, so that a predetermined gap is created between the area of ​​the material strip with the injection molded part and the free end of the primary ejector pin. At the same time, the positioning component is adjusted to the corresponding non-ejected position of the primary ejector plate assembly. When the primary ejector plate assembly separates from the secondary ejector plate assembly, and the primary ejector plate assembly moves away from the mold and returns to its initial position, the positioning end of the positioning component is embedded in the groove, thereby positioning the primary ejector plate assembly and buffering the impact of the primary ejector plate assembly on the base below. The difference between this other secondary ejection method and the first secondary ejection method described above lies only in the movement form of the primary and secondary ejector plate assemblies and the position setting of the positioning component. It does not involve any other structural modifications. Those skilled in the art can understand and obtain this other secondary ejection method through the above description. Therefore, no further illustrations or detailed descriptions are shown here.

[0085] like Figure 1-17 As shown, the embodiments provided by this utility model also relate to a secondary ejection tooling for a material strip, including a mold 1, a support base 2 for supporting the mold 1, and a secondary ejection mechanism for the mold as described above. A base 21 is also provided below the support base 2. A traveling material strip 3 is inserted into the mold 1. The mold 1 is used to intermittently form injection molded parts 33 on the traveling material strip 3. The secondary ejection mechanism for the mold is located inside the support base 2.

[0086] The mold 1 includes an upper mold 11 and a lower mold 12, and a feeding channel 13 for feeding the material belt 3 is provided between the upper mold 11 and the lower mold 12.

[0087] The dressing channel 13 is provided with conveyor rails 4 on the front and rear sides of the dressing direction to drive the material belt 3. The conveyor rails 4 on the front and rear sides are fixedly connected to the secondary top plate assembly 7 so as to move synchronously with the secondary top plate assembly 7, thereby ensuring the smooth movement of the material belt 3.

[0088] In this embodiment, the conveyor track 4 is fixedly connected to the secondary back plate 72 of the secondary top plate assembly 7.

[0089] The operation process of the secondary ejection fixture for this strip can be referenced from the operation process of the secondary ejection mechanism of the mold described above.

[0090] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A secondary ejection mechanism for a mold, wherein a traveling material strip is provided inside the mold, and the mold is used to intermittently form injection molded parts on the traveling material strip, characterized in that, The secondary ejection mechanism includes: A primary ejector plate assembly, wherein a primary ejector pin is provided on the primary ejector plate assembly, and the free end of the primary ejector pin can partially enter the mold and abut against the area where the material strip is formed of the injection molded part when the primary ejector plate assembly is driven. A secondary ejector plate assembly is provided with a secondary ejector pin. The free end of the secondary ejector pin can partially enter the mold and abut against the area of ​​the unformed injection molded part of the material strip when the secondary ejector plate assembly is driven. A pusher is used to drive the secondary top plate assembly to move toward or away from the mold. A linkage component is disposed between the primary ejector assembly and the secondary ejector assembly. It is used to drive the primary ejector assembly to move synchronously toward the mold when the secondary ejector assembly moves toward the mold. After the free ends of the primary ejector pin and the secondary ejector pin enter the mold, they together push the strip upward. An unlocking component, disposed on the mold, is used to at least partially extend into the linkage component during the synchronous movement of the primary ejector assembly and the secondary ejector assembly toward the mold to unlock the linkage component. After the secondary ejector assembly separates from the primary ejector assembly, it moves in opposite directions to create a predetermined gap between the area of ​​the material strip with the injection molded part and the free end of the primary ejector pin.

2. The mold secondary ejection mechanism as described in claim 1, characterized in that, The bottom of the mold is provided with guide posts. The primary top plate assembly and the secondary top plate assembly are sequentially mounted on the outside of the guide posts in the direction in which they move toward the mold, and both the primary top plate assembly and the secondary top plate assembly can slide freely along the guide posts.

3. The mold secondary ejection mechanism as described in claim 2, characterized in that, The mold has a first through hole for the primary ejector pin and the secondary ejector pin to pass through, and the secondary ejector plate assembly has a second through hole for the primary ejector pin to pass through.

4. The mold secondary ejection mechanism as described in claim 2, characterized in that, After the linkage component is unlocked, the pusher continues to push the secondary top plate assembly to move so that a predetermined gap is created between the area of ​​the strip where the injection molded part is formed and the free end of the primary ejector pin.

5. The mold secondary ejection mechanism as described in claim 2, characterized in that, After the linkage component is unlocked, the secondary ejector plate assembly is held in the unlocked position by the pusher, and the primary ejector plate assembly moves away from the mold and returns to the initial position, so that a predetermined gap is generated between the area of ​​the strip with the injection molded part and the free end of the primary ejector pin.

6. A secondary ejection mechanism for a mold as described in claim 4 or 5, characterized in that, The guide post is radially retractable and has a positioning element inside, and the positioning element has a positioning end that protrudes from the outer wall of the guide post in its natural state. The primary top plate assembly has a through hole for fitting with a guide post, and the inner wall of the through hole is provided with a groove. When the primary top plate assembly and the secondary top plate assembly are separated, the positioning end is embedded in the groove to position the primary top plate assembly, and the pushing member continues to push the secondary top plate assembly to move. Alternatively, when the primary top plate assembly separates from the secondary top plate assembly, and the primary top plate assembly moves away from the mold and returns to its initial position, the positioning end is embedded in the groove to achieve positioning of the primary top plate assembly.

7. The mold secondary ejection mechanism as described in claim 1, characterized in that, The linkage component includes a retractable locking tongue mounted on the secondary top plate assembly and a locking hook mounted on the primary top plate assembly; the unlocking component includes an unlocking rod located on the movement trajectory of the locking tongue. The locking hook engages with the locking tongue to lock the secondary top plate assembly and the primary top plate assembly and enable them to move synchronously toward the mold. When the latch reaches the end of the unlocking rod, the end of the unlocking rod pushes the latch back and releases it from the engagement with the lock hook, thereby unlocking the secondary top plate assembly and the primary top plate assembly. At least one of the latch and the hook is provided with a locking ramp to facilitate the hook to engage with the latch after passing over it; at least one of the ends of the latch and the unlocking rod is provided with an unlocking ramp to facilitate the end of the unlocking rod to push the latch back.

8. The mold secondary ejection mechanism as described in claim 7, characterized in that, The secondary top plate assembly includes a secondary pin plate and a secondary back plate that are sequentially arranged and fixedly connected along the direction of mold movement. The secondary ejector pin is arranged on the secondary pin plate. The end face of the peripheral side of the secondary back plate is provided with a sliding groove. The locking tongue is slidably assembled in the sliding groove and one end extends out of the sliding groove. A return spring that elastically abuts against the locking tongue is also provided in the sliding groove. The primary ejector plate assembly includes a primary pin plate and a primary back plate that are sequentially arranged and fixedly connected along the direction of mold movement. The primary ejector pin is arranged on the primary pin plate, and the locking hook is fixedly arranged at a corresponding position on the periphery of the primary pin plate.

9. A secondary ejection fixture for a material strip, characterized in that, The mold includes a mold, a support base for supporting the mold, and a secondary ejection mechanism for the mold as described in any one of claims 1-8. A traveling material strip is inserted inside the mold, and the mold is used to intermittently form injection molded parts on the traveling material strip. The secondary ejection mechanism for the mold is disposed inside the support base.

10. The secondary ejection fixture for a material strip as described in claim 9, characterized in that, The mold includes an upper mold and a lower mold, and a feeding channel for the feeding belt is provided between the upper mold and the lower mold.

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