Mould secondary ejection mechanism and material belt secondary ejection tool

Abstract

The utility model relates to the technical field of molds, in particular to a mold secondary ejection mechanism and a material belt secondary ejection tool comprising the mold secondary ejection mechanism, the mold secondary ejection mechanism comprises a primary ejection plate assembly, a secondary ejection plate assembly and an ejection piece, and when the primary ejection plate assembly and the secondary ejection plate assembly synchronously and upwards get close to a mold, the secondary ejection plate assembly is ejected by the ejection piece. The free end of the primary ejector pin and the free end of the secondary ejector pin enter a mold and jointly eject a material belt upwards, a sliding piece is arranged on the primary ejector plate assembly / the secondary ejector plate assembly in a sliding mode, and a driving piece capable of driving the secondary ejector plate assembly to move upwards relative to the primary ejector plate assembly when the sliding piece slides is arranged on the sliding piece. And the driving part can enable the free end of the secondary ejector pin to continuously move upwards relative to the free end of the primary ejector pin, 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. According to the scheme, the free end of the primary ejector pin is effectively prevented from scratching an injection molding part, and manual operation is not needed.

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] Existing injection molds include an upper mold, a lower mold, and a pin plate. After injection molding is completed, the upper mold moves away from the lower mold, and then the pin plate located below the lower mold rises, causing the ejector pins on the pin plate to push the injection molded part upward from inside the lower mold.

[0003] For some insert molding parts, factories have gradually abandoned the slow manual insertion method and switched to automated strip production. In the later stages of a molding cycle, after the ejector pin completes ejection, a safe distance needs to be maintained between the ejector pin and the product to prevent the product from being scratched and deformed by the ejector pin when the strip travels. The traditional demolding method of ejection only once cannot meet this requirement, and manually lifting the strip is a waste of manpower. Utility Model Content

[0004] This utility model provides a secondary ejection mechanism for molds and a secondary ejection fixture for material strips to solve the problem that ejector pins easily scratch injection molded parts in existing single ejection technology.

[0005] 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:

[0006] 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.

[0007] A secondary ejector plate assembly is located directly above the primary ejector plate assembly, and the secondary ejector plate assembly has a through hole for the primary ejector pin to pass through; the secondary ejector plate assembly is provided with a secondary ejector pin, the free end of which 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.

[0008] The pusher is used to drive the primary ejector assembly to move the primary ejector assembly and the secondary ejector assembly upward toward or downward away from the mold.

[0009] When the primary ejector plate assembly and the secondary ejector plate assembly move upward toward the mold simultaneously, the free ends of the primary ejector pin and the secondary ejector pin enter the mold and together push the strip upward.

[0010] A sliding member is slidably provided on the primary ejector plate assembly / secondary ejector plate assembly. The sliding member has a driving member that can drive the secondary ejector plate assembly to move upward relative to the primary ejector plate assembly when it slides. The driving member can cause the free end of the secondary ejector pin to continue to move upward relative to the free end of the primary ejector pin, so that a predetermined gap is generated between the area of ​​the material strip where the injection molded part is formed and the free end of the primary ejector pin.

[0011] Optionally, one end of the sliding member is mounted on the primary top plate assembly, and the other end extends to the outside of the primary top plate assembly. The primary and secondary top plate assemblies are provided with support seats for supporting the mold on their outer sides. The inner wall of the support seat has an inclined surface facing the other end of the sliding member, and the angle between the inclined surface and the sliding direction of the sliding member is greater than or equal to 45° and less than 90°. During the movement of the primary and secondary top plate assemblies toward the mold, the other end of the sliding member is squeezed by the inclined surface and driven to slide inward, so as to drive the secondary top plate assembly to move upward relative to the primary top plate assembly through the driving member.

[0012] Optionally, the lower end of the secondary top plate assembly has another inclined surface facing one end of the slider, the angle between the other inclined surface and the sliding direction of the slider being less than or equal to 45°; one end of the slider is provided with a roller for rolling contact and pressing engagement with the other inclined surface, the roller constituting the driving member, and when the slider slides inward, the roller presses the other inclined surface to make the secondary top plate assembly move upward relative to the primary top plate assembly; a return spring is provided between one end of the slider and the primary top plate assembly for pushing the slider outward.

[0013] Optionally, a support surface is provided at the lower end of the other inclined surface. After the secondary top plate assembly moves upward relative to the primary top plate assembly, the roller moves to the support surface and supports it upward to maintain the relative position of the secondary top plate assembly and the primary top plate assembly.

[0014] Optionally, the primary top plate assembly is provided with a sliding groove, the sliding member is slidably assembled in the sliding groove, and the return spring is located between one end of the sliding member and the inner end of the sliding groove; the upper surface of the primary top plate assembly is provided with a clearance hole communicating with the sliding groove, and at least one of the roller and the other inclined surface passes through the clearance hole and is pressed and engaged with the other.

[0015] Optionally, the driving component includes a cam rotatably disposed on the upper end of the primary top plate assembly. The sliding member is driven to connect with the cam via a gear and rack mechanism. The lower end of the secondary top plate assembly abuts against the outer periphery of the cam. When the sliding member slides inward, it drives the cam to rotate so that the secondary top plate assembly moves upward relative to the primary top plate assembly. A return spring for pushing the sliding member outward is provided between one end of the sliding member and the primary top plate assembly.

[0016] Optionally, a limiting platform is provided at the upper end of the inclined surface, and the limiting platform interferes with the trajectory of the other end of the slider moving upward to limit the position of the slider and the primary top plate assembly moving upward toward the mold.

[0017] 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 upward approach to the mold, and both the primary top plate assembly and the secondary top plate assembly can slide freely along the guide post.

[0018] 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.

[0019] 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.

[0020] This utility model has the following beneficial effects:

[0021] In this invention, after the free ends of the primary and secondary ejector pins jointly eject the material strip, the secondary ejector plate assembly can be driven to move upward relative to the primary ejector plate assembly via a sliding member and a driving member. Consequently, the free end of the secondary ejector pin can continue to move upward relative to the free end of the primary ejector pin, thus continuing to eject the material strip. 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, achieving automatic secondary ejection and creating a safe gap. This effectively prevents the free end of the primary ejector pin from scratching the injection molded part, and requires no manual operation.

[0022] 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

[0023] 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.

[0024] An example:

[0025] Figure 1 A schematic diagram of a material strip secondary ejection tooling that includes a mold secondary ejection mechanism;

[0026] Figure 2 for Figure 1 A structural diagram from another corresponding perspective;

[0027] Figure 3 for Figure 1 A schematic diagram of the structure after removing the support base;

[0028] Figure 4 This is a schematic diagram of the support structure;

[0029] Figure 5 This is a structural schematic diagram of a primary roof slab assembly;

[0030] Figure 6 This is a structural schematic diagram of the secondary roof slab assembly;

[0031] Figure 7 for Figure 6 A structural diagram from another corresponding perspective;

[0032] Figure 8 This is a schematic diagram of the specific structure of the sliding component;

[0033] Figure 9 This is a cross-sectional view of the mold's secondary ejection mechanism at the non-ejected position.

[0034] Figure 10 This is a cross-sectional view of the mold's secondary ejection mechanism at the start of the primary ejection.

[0035] Figure 11 This is a cross-sectional view of the mold's secondary ejection mechanism after the secondary ejection is completed.

[0036] Figure 12 This is a schematic diagram of the material strip structure (injection molding has been completed).

[0037] The diagram is marked as follows:

[0038] 1. Mold; 11. Upper mold; 12. Lower mold; 13. Fitting channel;

[0039] 2. Support base; 21. First inclined surface; 22. Limiting platform;

[0040] 3. Material strip; 31. Traveling section; 32. Terminal; 33. Injection molded part;

[0041] 4. Conveyor track;

[0042] 5. Pushing component;

[0043] 6. Primary top plate assembly; 61. Primary needle plate; 611. Slide groove; 612. Clearance hole; 62. Primary back plate; 63. Sliding component; 631. Outer roller; 632. Inner roller; 633. Return spring; 64. Primary ejector pin; 65. First insertion hole;

[0044] 7. Secondary top plate assembly; 71. Secondary pin plate; 72. Secondary back plate; 73. Secondary ejector pin; 74. Secondary through hole; 75. Through hole; 76. Secondary inclined surface; 77. Support surface;

[0045] 8. Guide column.

[0046] Another example:

[0047] Figure 13 This is a schematic diagram showing the installation status of the sliding components and driving components on the primary top plate assembly.

[0048] Figure 14 This is a schematic diagram showing the assembly state of the sliding and driving components;

[0049] Figure 15 This is a structural schematic diagram of the secondary roof slab assembly;

[0050] Figure 16 This is a cross-sectional view of the mold's secondary ejection mechanism after the secondary ejection is completed.

[0051] The diagram is marked as follows:

[0052] 100. Lower mold;

[0053] 200. Support base; 201. First inclined plane; 202. Limiting platform;

[0054] 300. Primary top plate assembly; 301. Primary pin plate; 302. Primary back plate; 303. Slide groove; 304. Primary ejector pin;

[0055] 400. Sliding component; 401. Outer roller; 402. Rack; 403. Gear; 404. Cam; 405. Mounting base; 406. Return spring;

[0056] 500. Secondary top plate assembly; 501. Secondary pin plate; 502. Secondary back plate; 503. Clearance groove; 504. Secondary ejector pin;

[0057] 600, material strip. Detailed Implementation

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] like Figure 1-12 As shown, one 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, and the mold 1 is used to intermittently form injection molded parts 33 on the traveling material strip 3. Specifically, the mold 1 includes an upper mold 11 and a lower mold 12, and a feeding channel 13 for feeding the material strip 3 is provided between the upper mold 11 and the lower mold 12. In this embodiment, the material strip 3 includes a traveling portion 31 and a plurality of 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. Specifically, the secondary ejection mechanism includes:

[0063] A primary ejector plate assembly 6 is provided with a primary ejector pin 64. The free end of the primary ejector pin 64 enters the mold 1 (specifically the lower mold 12) and can abut against the area of ​​the strip 3 where the injection molded part 33 is formed when the primary ejector plate assembly 6 is driven.

[0064] The secondary ejector plate assembly 7 is located directly above the primary ejector plate assembly 6, and a through hole 75 is provided on the secondary ejector plate assembly 7 for the primary ejector pin 64 to pass through; a secondary ejector pin 73 is provided on the secondary ejector plate assembly 7, and the free end of the secondary ejector pin 73 enters the mold 1 (specifically the lower mold 12) and can abut against the area of ​​the unformed injection molded part 33 of the material strip 3 when the secondary ejector plate assembly 7 is driven;

[0065] The pusher 5 is used to drive the primary ejector assembly 6 so that the primary ejector assembly 6 and the secondary ejector assembly 7 move upward toward or downward away from the mold 1. Specifically, linear telescopic devices such as cylinders or electric telescopic rods can be selected.

[0066] When the primary ejector plate assembly 6 and the secondary ejector plate assembly 7 move upward toward the mold 1 simultaneously, the free ends of the primary ejector pin 64 and the secondary ejector pin 73 enter the mold 1 (specifically, inside the lower mold 12) and together push the strip 3 upward.

[0067] A sliding member 63 is slidably provided on the primary ejector assembly 6 / secondary ejector assembly 7. The sliding member 63 has a driving member that can drive the secondary ejector assembly 7 to move upward relative to the primary ejector assembly 6 when it slides. The driving member can cause the free end of the secondary ejector pin 73 to continue to move upward relative to the free end of the primary ejector pin 64, so that a predetermined gap is generated between the area of ​​the strip 3 where the injection molded part 33 is formed and the free end of the primary ejector pin 64.

[0068] This solution achieves automatic secondary ejection and creates a safety gap, effectively preventing the free end of the primary ejector pin from scraping the injection molded part, and requires no manual operation.

[0069] As an optimization solution, such as Figure 5 and Figure 9-11 As shown, the sliding member 63 is slidably disposed on the primary top plate assembly 6, and one end of the sliding member 63 is mounted on the primary top plate assembly 6, while the other end extends to the outside of the primary top plate assembly 6. The primary top plate assembly 6 and the secondary top plate assembly 7 are provided with support seats 2 for supporting the mold 1 on their outer sides.

[0070] The inner wall of the support base 2 has an inclined surface, namely the first inclined surface 21, facing the other end of the slider 63. The angle α between the first inclined surface 21 and the sliding direction of the slider 63 is equal to 45°. Of course, as an alternative, the angle α can also be selected as needed within the feasible range of greater than or equal to 45° and less than 90°.

[0071] During the movement of the primary top plate assembly 6 and the secondary top plate assembly 7 toward the mold 1, the other end of the sliding member 63 is squeezed by the first inclined surface 21 and then driven to slide inward, so as to drive the secondary top plate assembly 7 to move upward relative to the primary top plate assembly 6 through the driving member, thereby achieving the effect of automatic and linked action.

[0072] This embodiment is one implementation method, such as Figure 7 and Figure 9-11 As shown, the lower end of the secondary top plate assembly 7 has another inclined surface, namely the second inclined surface 76, which faces one end of the slider 63. The angle β between the second inclined surface 76 and the sliding direction of the slider 63 is equal to 45°. Of course, as an alternative, the angle β can also be selected as needed within an achievable range of less than or equal to 45°.

[0073] like Figure 5 and Figure 7-11 As shown, one end of the sliding member 63 is provided with an inner roller 632 for rolling contact and pressing engagement with another inclined surface, namely the second inclined surface 76. The inner roller 632 constitutes the aforementioned driving member. When the sliding member 63 slides inward, the inner roller 632 presses the second inclined surface 76 to make the secondary top plate assembly 7 move upward relative to the primary top plate assembly 6.

[0074] like Figure 8-11As shown, in order to allow the slider 63 to slide outward smoothly and return smoothly, a return spring 633 for pushing the slider 63 outward is provided between one end of the slider 63, i.e. the inner end, and the primary top plate assembly 6.

[0075] like Figure 3 , 5 and Figure 8-11 As shown, in order to reduce the friction between the other end of the slider 63 and the first inclined surface 21, an outer roller 631 is provided at the other end of the slider 63. The outer roller 631 rolls and presses against the first inclined surface 21.

[0076] like Figure 7 and Figure 9-11 As shown, in order to be effectively supported after the secondary top plate assembly 7 moves upward relative to the primary top plate assembly 6, a support surface 77 is provided at the lower end of the other inclined surface, namely the second inclined surface 76. After the secondary top plate assembly 7 moves upward relative to the primary top plate assembly 6, the roller moves to the support surface 77 and cooperates with the support surface 77 to support upward and maintain the relative position of the secondary top plate assembly 7 and the primary top plate assembly 6.

[0077] For the specific settings of slider 63, such as Figure 5 and Figure 9 , 10 As shown, the primary top plate assembly 6 is provided with a slide groove 611, and the sliding member 63 is slidably assembled in the slide groove 611. The return spring 633 is located between one end of the sliding member 63, i.e. the inner end, and the inner end of the slide groove 611. The upper end surface of the primary top plate assembly 6 is provided with a clearance hole 612 communicating with the slide groove 611. The inner roller 632 and the second inclined surface 76 both pass through the clearance hole 612 and are mutually pressed and engaged.

[0078] Of course, as an achievable combination, at least one of the inner roller 632 and the second inclined surface 76 can pass through the clearance hole 612 and be pressed into the other. For example, the inner roller 632 is located inside the clearance hole 612, and the second inclined surface 76 passes through the clearance hole 612 and is pressed into the inner roller 632.

[0079] like Figure 5-11As shown in more detail, the primary top plate assembly 6 includes a primary needle plate 61 and a primary back plate 62 fixedly connected to the lower end of the primary needle plate 61. A groove 611, a clearance hole 612, a slider 63, and a primary ejector pin 64 are all disposed on the primary needle plate 61. The pusher 5 is drivenly connected to the primary back plate 62. Specifically, the groove 611 is a groove structure with a shape adapted to the slider 63, carved out from the end face of the primary needle plate 61 facing the primary back plate 62. The outer end of the groove structure penetrates through the primary needle plate 61. The corresponding outer end face, and the groove structure and the sliding member 63 are both structures with a smaller outer side and a larger inner side, so as to prevent the sliding member 63 from falling out of the groove 611 while allowing a predetermined sliding stroke; the secondary top plate assembly 7 includes a secondary needle plate 71 and a secondary back plate 72 fixedly connected to the lower end of the secondary needle plate 71, the secondary pin 73 is disposed on the secondary needle plate 71, the second inclined surface 76 is disposed at the lower end of the secondary back plate 72, and the through hole 75 penetrates the secondary needle plate 71 and the secondary back plate 72.

[0080] like Figure 4 and Figure 9-11 As shown, a limiting platform 22 is provided at the upper end of the first inclined surface 21. The limiting platform 22 interferes with the trajectory of the other end of the slider 63 moving upward to limit the position of the slider 63 and the primary top plate assembly 6 moving upward towards the mold 1.

[0081] like Figure 3 and Figure 5-7 and Figure 9-11 As shown, a guide post 8 is provided at the bottom of the mold 1. The guide post 8 is fixedly connected to the lower mold 12 of the mold 1. The primary top plate assembly 6 and the secondary top plate assembly 7 are sequentially mounted on the outside of the guide post 8 in an upward direction close to the mold 1, and both the primary top plate assembly 6 and the secondary top plate assembly 7 can slide freely along the guide post 8. In this embodiment, the primary top plate assembly 6 is provided with a first through hole 65 that mates with the guide post 8, and the secondary top plate assembly 7 is provided with a second through hole 74 that mates with the guide post 8.

[0082] The specific operation process of the secondary ejection mechanism of mold 1 in this embodiment can be divided into the following steps:

[0083] 1. The injection molding process is carried out in the mold 1. The primary ejector plate assembly 6 and the secondary ejector plate assembly 7 are stacked on top of each other and are both in the non-ejected position. The sliding part 63 is in the extended state. The outer roller 631 is not in contact with the first inclined surface 21, and there is no squeezing effect between the inner roller 632 and the second inclined surface 76.

[0084] 2. After injection molding is completed, the upper mold 11 of mold 1 opens upward. At this time, the ejector 5 can push the first ejector plate assembly 6 upward to bring it closer to the lower mold 12. The second ejector plate assembly 7 moves closer to the lower mold 12 under the push of the first ejector plate assembly 6. When the outer roller 631 contacts the first inclined surface 21, the first ejector pin 64 and the second ejector pin 73 together push the strip 3 out of the lower mold 12, completing one ejection.

[0085] Third, the pusher 5 continues to push the top plate assembly 6 upward once. Under the pressure of the first inclined surface 21, the outer roller 631 pushes the slider 63 to slide inward. The inner roller 632 presses the second inclined surface 76 so that the secondary top plate assembly 7 is raised relative to the primary top plate assembly 6. The secondary ejector pin 73 also moves upward relative to the primary ejector pin 64, and the secondary ejection begins.

[0086] Fourth, when the other end of the sliding member 63, i.e. the outer end, contacts the limiting platform 22, the pushing member 5 no longer pushes the primary top plate assembly 6. At this time, the inner roller 632 completes the lifting of the secondary top plate assembly 7 and supports it below the support surface 77. A predetermined gap is formed between the secondary top plate assembly 7 and the primary top plate assembly 6. Then, the secondary ejector pin 73 pushes the material strip 3 through the area of ​​the unformed injection molded part 33 to lift the material strip 3 relative to the primary ejector pin 64 out of the predetermined gap. This creates a predetermined gap between the area of ​​the material strip 3 with the injection molded part 33 and the free end of the primary ejector pin 64, preventing the primary ejector pin 64 from scraping against the injection molded part 33 and completing the secondary ejection.

[0087] 5. As the material strip 3 moves forward, 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 primary top plate assembly 6 to move downward back. Under the push of the return spring 633, the sliding member 63 slides outward, and the inner roller 632 returns from the support surface 77 to the second inclined surface 76 and makes contact with the compression of the second inclined surface 76. When the outer roller 631 disengages from the contact with the first inclined surface 21, the secondary top plate assembly 7 contacts the primary top plate assembly 6 and stacks up and down until both the primary top plate assembly 6 and the secondary top plate assembly 7 return to the un-ejected position.

[0088] 6. The upper mold 11 and lower mold 12 of mold 1 are closed to proceed to the next injection molding process.

[0089] This embodiment also relates to a secondary ejection fixture for a strip, including a mold 1, a support base 2 for supporting the mold 1, and a secondary ejection mechanism for the mold 1 as described above. A traveling strip 3 is inserted inside the mold 1. The mold 1 is used to intermittently form injection molded parts 33 on the traveling strip 3. The secondary ejection mechanism for the mold 1 is located inside the support base 2.

[0090] 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.

[0091] 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.

[0092] In this embodiment, the conveyor track 4 is fixedly connected to the secondary back plate 72 of the secondary top plate assembly 7.

[0093] like Figure 13-16 As shown, another embodiment of this utility model provides a secondary ejection mechanism for a mold, which differs from the previous embodiment only in the structure of the driving component.

[0094] This other embodiment, as another implementation method, replaces the driving method of the inner roller and the second inclined surface in the previous embodiment. The driving component includes a cam 404 rotatably disposed on the upper end of the primary top plate assembly 300. The sliding member 400 is driven to connect with the cam 404 through a gear and rack mechanism. The lower end of the secondary top plate assembly 500 abuts against the outer periphery of the cam 404. When the sliding member 400 slides inward, it drives the cam 404 to rotate, causing the secondary top plate assembly 500 to move upward relative to the primary top plate assembly 300. Similar to the previous embodiment, in this embodiment, the sliding member 400 is also driven to engage with the first inclined surface 201 on the support base 200 through the outer roller 401. The upper end of the first inclined surface 201 is also provided with a limiting platform 202.

[0095] Similarly, a return spring 406 for pushing the slider 400 outward is provided between one end of the slider 400, i.e. the inner end, and the primary top plate assembly 300.

[0096] More specifically, the primary top plate assembly 300 is provided with a slide groove 303, and the sliding member 400 is slidably assembled in the slide groove 303. The sliding member 400 is provided with a rack 402. The cam 404 is rotatably mounted on the primary top plate assembly 300 via the mounting base 405. The cam 404 is coaxially provided with a gear 403. The rack 402 passes through the slide groove 303 and meshes with the gear 403 to drive the cam 404 to rotate when the sliding member 400 slides. The return spring 406 is provided between the inner end of the sliding member 400 and the inner end of the slide groove 303.

[0097] Furthermore, in this embodiment, the primary top plate assembly 300 includes a primary needle plate 301 and a primary back plate 302 fixedly connected to the lower end of the primary needle plate 301. A cam 404, a slide groove 303, a slider 400, and a primary ejector pin 304 are disposed on the primary needle plate 301, and a pusher is drivenly connected to the primary back plate 302. The secondary top plate assembly 500 includes a secondary needle plate 501 and a secondary back plate 502 fixedly connected to the lower end of the secondary needle plate 501. A secondary ejector pin 504 is disposed on the secondary needle plate 501. The lower end of the secondary needle plate 501 abuts against the outer periphery of the cam 404. The secondary back plate 502 is provided with an avoidance groove 503 to avoid the cam 404. The avoidance groove 503 also avoids the gear 403 and the mounting base 405.

[0098] The specific operation process of the secondary ejection mechanism of the mold in this embodiment can be divided into the following steps:

[0099] 1. In the injection molding process, the primary ejector plate assembly 300 and the secondary ejector plate assembly 500 are stacked on top of each other and are both in the non-ejected position. The sliding part 400 is in the extended state. The outer roller 401 is not in contact with the first inclined surface 201. The lower end of the secondary needle plate 501 abuts against the outer periphery of the small radius part of the cam 404.

[0100] 2. After injection molding is completed, the upper mold of the mold opens upward. At this time, the ejector can push the ejector plate assembly 300 upward to bring it closer to the lower mold 100. The secondary ejector plate assembly 500 moves closer to the lower mold 100 under the push of the primary ejector plate assembly 300. When the outer roller 401 contacts the first inclined surface 201, the primary ejector pin 304 and the secondary ejector pin 504 together push the material strip 600 out of the lower mold 100, completing one ejection.

[0101] Third, the pusher continues to push the top plate assembly 300 upward. Under the pressure of the first inclined surface 201, the outer roller 401 pushes the sliding member 400 to slide inward. The cam 404 rotates, causing the outer periphery of its large radius part to gradually abut against the lower end of the secondary pin plate 501, thereby pushing the secondary top plate assembly 500 to rise relative to the primary top plate assembly 300. The secondary ejector pin 504 also moves upward relative to the primary ejector pin 304, and the secondary ejection begins.

[0102] Fourth, when the other end of the sliding member 400, i.e. the outer end, contacts the limiting platform 202, the pusher no longer pushes the primary top plate assembly 300. At this time, the cam 404 completes the lifting of the secondary top plate assembly 500 and supports it under the secondary pin plate 501. A predetermined gap is formed between the secondary top plate assembly 500 and the primary top plate assembly 300. Then, the secondary ejector pin 504 pushes the material strip 600 to lift the material strip 600 relative to the primary ejector pin 304 out of the predetermined gap through the area of ​​the material strip 600 with the injection molded part, so that a predetermined gap is generated between the area of ​​the material strip 600 with the injection molded part and the free end of the primary ejector pin 304, preventing the primary ejector pin 304 from scraping against the injection molded part, and completing the secondary ejection.

[0103] 5. As the material strip 600 moves forward, it removes the already injected material strip 600 from the mold and simultaneously moves the material strip 600 to be injected into the mold. At this time, the pusher drives the primary ejector plate assembly 300 to move downwards. Under the push of the return spring 406, the sliding member 400 slides outwards, and the cam 404 rotates in the opposite direction so that the outer periphery of its small radius part gradually abuts against the lower end of the secondary ejector plate 501. When the outer roller 401 disengages from the first inclined surface 201, the secondary ejector plate assembly 500 contacts the primary ejector plate assembly 300 and stacks on top of each other until both the primary ejector plate assembly 300 and the secondary ejector plate assembly 500 return to the un-ejected position.

[0104] 6. The upper and lower molds of the mold are closed 100° to proceed to the next injection molding process.

[0105] This other embodiment also relates to a secondary ejection fixture for a strip. Compared with the secondary ejection fixture for a strip in the previous embodiment, the secondary ejection fixture for a strip is the same except for the structure of the driving part of the secondary ejection mechanism, so it will not be described again.

[0106] 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 located directly above the primary ejector plate assembly, and the secondary ejector plate assembly has a through hole for the primary ejector pin to pass through; the secondary ejector plate assembly is provided with a secondary ejector pin, the free end of which 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. The pusher is used to drive the primary ejector assembly to move the primary ejector assembly and the secondary ejector assembly upward toward or downward away from the mold. When the primary ejector plate assembly and the secondary ejector plate assembly move upward toward the mold simultaneously, the free ends of the primary ejector pin and the secondary ejector pin enter the mold and together push the strip upward. A sliding member is slidably provided on the primary ejector plate assembly / secondary ejector plate assembly. The sliding member has a driving member that can drive the secondary ejector plate assembly to move upward relative to the primary ejector plate assembly when it slides. The driving member can cause the free end of the secondary ejector pin to continue to move upward relative to the free end of the primary ejector pin, so that a predetermined gap is generated between the area of ​​the material strip where the injection molded part is formed and the free end of the primary ejector pin.

2. The mold secondary ejection mechanism as described in claim 1, characterized in that, One end of the sliding member is mounted on the primary top plate assembly, and the other end extends to the outside of the primary top plate assembly. Support seats for supporting the mold are provided on the outside of the primary top plate assembly and the secondary top plate assembly. The inner wall of the support has an inclined surface facing the other end of the slider, and the angle between the inclined surface and the sliding direction of the slider is greater than or equal to 45° and less than 90°. During the movement of the primary top plate assembly and the secondary top plate assembly toward the mold, the other end of the sliding member is squeezed by the inclined surface and then driven to slide inward, so as to drive the secondary top plate assembly to move upward relative to the primary top plate assembly through the driving member.

3. The mold secondary ejection mechanism as described in claim 2, characterized in that, The lower end of the secondary top plate assembly has another inclined surface facing one end of the slider, and the angle between the other inclined surface and the sliding direction of the slider is less than or equal to 45°. One end of the slider is provided with a roller for rolling contact and pressing engagement with another inclined surface. The roller constitutes the driving component. When the slider slides inward, it presses the other inclined surface through the roller to make the secondary top plate assembly move upward relative to the primary top plate assembly. A return spring for pushing the slider outward is provided between one end of the slider and the primary top plate assembly.

4. The mold secondary ejection mechanism as described in claim 3, characterized in that, The lower end of the other inclined surface extends to provide a support surface. After the secondary top plate assembly moves upward relative to the primary top plate assembly, the roller moves to the support surface and cooperates with the support surface to maintain the relative position of the secondary top plate assembly and the primary top plate assembly.

5. The mold secondary ejection mechanism as described in claim 3, characterized in that, The primary top plate assembly is provided with a sliding groove, the sliding member is slidably assembled in the sliding groove, and the return spring is located between one end of the sliding member and the inner end of the sliding groove. The upper surface of the primary top plate assembly is provided with a clearance hole communicating with the slide groove, and at least one of the roller and the other inclined surface passes through the clearance hole and is pressed into the other.

6. The mold secondary ejection mechanism as described in claim 2, characterized in that, The driving component includes a cam rotatably disposed on the upper end of the primary top plate assembly. The sliding component is driven to connect with the cam through a gear and rack mechanism. The lower end of the secondary top plate assembly abuts against the outer periphery of the cam. When the sliding component slides inward, it drives the cam to rotate so that the secondary top plate assembly moves upward relative to the primary top plate assembly. A return spring for pushing the slider outward is provided between one end of the slider and the primary top plate assembly.

7. The mold secondary ejection mechanism as described in claim 2, characterized in that, The upper end of the inclined surface extends inward to provide a limiting platform. The limiting platform interferes with the trajectory of the other end of the slider moving upward to limit the position of the slider and the primary top plate assembly moving upward toward the mold.

8. 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 that they are moving upward toward the mold. Both the primary top plate assembly and the secondary top plate assembly can slide freely along the guide posts.

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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