Secondary ejection mechanism of a mold

Abstract

The application discloses a secondary ejection mechanism of a mold, which comprises a mold core plate and a ejector plate which is arranged to slide relative to the mold core plate, a forming insert for forming a cable tongue is arranged in the mold core plate, the forming insert comprises a fixed insert which is fixed to the mold core plate and a movable insert which is arranged to slide in the fixed insert, a fixed ejector pin which slides through the mold core plate and a movable ejector pin which slides to abut against the movable insert are arranged in the ejector plate, a reverse ejector plate is arranged at one end of the mold core plate which is close to the ejector plate, and a reverse ejector pin corresponding to the movable ejector pin is arranged in the reverse ejector plate. The secondary ejection mechanism of the mold has the advantages that the reverse ejector pin which moves synchronously with the fixed ejector pin acts on the movable ejector pin, the movable ejector pin is separated from the movable insert, the movable insert is separated from the catch of the cable tongue, the secondary ejection of the mold can be realized without a lever transmission structure, and the design, processing and assembly of the mold are facilitated.

Description

Technical Field

[0001] This application relates to the field of molding die technology, and in particular to a secondary ejection mechanism for a die. Background Technology

[0002] Cable ties, also known as wire ties, cable bundles, or locking straps, are straps used to bundle things together. They are generally classified by material, such as nylon cable ties and stainless steel cable ties. Nylon cable ties are injection molded. To meet the shape requirements of plastic products, they often have complex internal structures. During the mold design process, some plastic products cannot be demolded in a single ejection, requiring a secondary ejection mechanism. Existing secondary ejection structures often rely on levers or rocker arms, resulting in complex internal mold structures and inconvenient installation. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide a secondary ejection mechanism for a mold to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a secondary ejection mechanism for a mold, including a mold core plate and an ejector plate slidably disposed relative to the mold core plate. The mold core plate is provided with a forming insert for forming cable tie springs. The forming insert includes a fixed insert fixed to the mold core plate and a movable insert slidably disposed within the fixed insert. The ejector plate is provided with a fixed ejector pin that slides through the mold core plate and a sliding ejector pin that slides against the movable insert. A reverse ejector plate is provided at one end of the mold core plate near the ejector plate, and a reverse ejector pin corresponding to the sliding ejector pin is provided in the reverse ejector plate.

[0005] Furthermore, in the secondary ejection mechanism of the mold described above, the mold core plate is provided with a first step groove for installing the fixed insert, and the outer wall of the fixed insert near the reverse pin plate has a first limiting boss corresponding to the first step groove.

[0006] Furthermore, in the secondary ejection mechanism of the mold described above, the fixed insert is provided with a second step groove for mounting the movable insert, and a second limiting platform that slides in the second step groove protrudes from the outer wall of the movable insert near the reverse needle plate.

[0007] Furthermore, in the secondary ejection mechanism of the mold described above, the sliding ejector pin is slidably mounted on the ejector plate via a mounting block.

[0008] Furthermore, in the secondary ejection mechanism of the mold described above, the ejector plate includes a first needle plate and a second needle plate that are fixed to each other, and the end of the first needle plate facing away from the second needle plate is provided with an installation groove corresponding to the mounting block.

[0009] Furthermore, in the secondary ejection mechanism of the mold described above, the sliding ejector pin includes a limiting head, a locking section, a connecting section, and an ejection section arranged in sequence, and the radii of the limiting head, locking section, connecting section, and ejection section decrease in sequence. The mounting block is provided with countersunk holes corresponding to the limiting head and the locking section, and the corresponding end of the reverse ejector pin slides against the locking section.

[0010] Furthermore, in the secondary ejection mechanism of the mold described above, the circumferential surface of the snap-fit ​​section is recessed with an annular snap-fit ​​groove, and the mounting block is provided with a snap-fit ​​block that is elastically snapped into the snap-fit ​​groove.

[0011] Furthermore, in the secondary ejection mechanism of the mold described above, a spring is provided between the end of the snap-fit ​​block opposite to the sliding ejector pin and the inner wall of the mounting groove.

[0012] Compared with the prior art, the secondary ejection mechanism of the mold of this utility model has a simple structure. It uses the reverse ejector pin that moves synchronously with the fixed ejector pin to act on the sliding ejector pin, so that the sliding ejector pin disengages from the sliding insert, and the sliding insert disengages from the locking teeth of the spring tongue. The secondary ejection of the mold can be realized without the need for transmission structures such as levers, which facilitates the design, processing and assembly of the mold. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 The diagram shown is a structural schematic of the secondary ejection mechanism of the mold in a specific embodiment of this utility model.

[0014] Figure 2 The figure shown is a top view of a specific embodiment of the present invention.

[0015] Figure 3 As shown Figure 2 A cross-sectional schematic diagram of AA.

[0016] Figure 4 As shown Figure 2 A cross-sectional view of BB.

[0017] Figure 5The diagram shown is an exploded view of the molding insert, reverse ejector pin, sliding ejector pin, and mounting block in a specific embodiment of this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Combination Figures 1 to 5 As shown, a secondary ejection mechanism for a mold includes a core plate 1 and an ejector plate 2 slidably disposed relative to the core plate 1. The core plate 1 is provided with a forming insert 3 for forming cable tie springs. The forming insert 3 includes a fixed insert 31 fixed to the core plate 1 and a movable insert 32 slidably disposed within the fixed insert 31. The ejector plate 2 is provided with a fixed ejector 4 that slides through the core plate 1 and a sliding ejector 5 that slides against the movable insert 32. A reverse ejector plate 6 is provided at one end of the core plate 1 near the ejector plate 2. The reverse ejector plate 6 is provided with a reverse ejector 7 corresponding to the sliding ejector 5.

[0020] In this technical solution, the conventional mold base, layer plate, guide pillars, and plug bolts are omitted from the mold. The number of secondary ejection mechanisms is determined by the number of cable ties injected into the mold; that is, one secondary ejection mechanism is set for each cable tie cavity. The mold core plate and ejector plate can directly utilize existing structures. During ejection, the mold core plate and ejector pins only need to be able to approach each other. The mold core plate is used for forming the cable tie head. The specific structure and principle are existing technologies and will not be described in detail here. The mold core plate and forming inserts have cavities corresponding to the cable ties. The cavities for forming the remaining parts of the cable tie are conventional structures and do not involve secondary ejection structures, so they will not be shown here. The mold core plate also has other inserts for forming. The structure of the fixed ejector pin and the reverse ejector pin is the same as the existing ejector pin structure, and the length is determined according to the actual usage requirements. After the mold opens, the molding machine applies a pushing force to the ejector plate. The ejector plate drives the fixed ejector pin and the sliding ejector pin to move synchronously towards the mold core plate. The fixed ejector pin acts on the surface of the cable tie. This design achieves cable tie demolding. A sliding ejector pin acts on a moving insert, which pushes the cable tie's spring clip away from a fixed insert, reducing the force on the spring clip and preventing deformation and breakage caused by direct demolding. During the sliding process, a reverse ejector pin gradually approaches the sliding ejector pin until it abuts against the corresponding part of the sliding ejector pin. The sliding ejector pin is limited by the reverse ejector pin and slides relative to the ejector plate. The moving insert loses power, and the fixed ejector pin continues to push the cable tie out of the mold. The spring clip's locking teeth disengage from the moving insert, and the fixed insert no longer acts on the spring clip. The spring clip can deform to the side away from the moving insert, reducing the force on the locking teeth and preventing deformation, thus improving the cable tie's pass rate. The secondary ejection mechanism of this mold is simple in structure. It utilizes a reverse ejector pin that moves synchronously with the fixed ejector pin to act on the sliding ejector pin, causing the sliding ejector pin to disengage from the sliding insert, which in turn disengages the sliding insert from the locking teeth of the spring clip. Secondary ejection of the mold can be achieved without levers or other transmission structures, facilitating mold internal design, processing, and assembly.

[0021] For example, see Figure 3 and Figure 4 As shown, the core plate 1 is provided with a first step groove for installing the fixed insert 31, and the outer wall of the fixed insert 31 near the reverse needle plate 6 has a first limiting boss corresponding to the first step groove.

[0022] In this technical solution, the fixed insert can be quickly positioned and installed by the cooperation of the first limiting boss and the first step groove. The fixed insert is limited in the first step groove by the reverse pin plate.

[0023] For example, see Figure 3 and Figure 4 As shown, the fixed insert 31 is provided with a second step groove for installing the movable insert 32, and the outer wall of the movable insert 32 near the reverse needle plate 6 has a second limiting platform that slides in the second step groove.

[0024] In this technical solution, the movable insert is slidably disposed in the second step groove. The second limiting platform and the reverse pin plate restrict the sliding stroke of the movable insert. During the ejection process, the second limiting platform abuts against the step of the second step groove to prevent it from being carried away by the cable tie and to ensure the demolding effect. During the mold closing process, the conventional cavity or insert corresponding to the movable mold abuts against the bottom of the movable insert and pushes the movable insert to reset. When the top of the movable insert abuts against the directional pin plate, it is reset to the correct position.

[0025] For example, see Figures 1 to 5 As shown, the sliding ejector pin 5 is slidably mounted on the ejector plate 2 via the mounting block 8.

[0026] In this technical solution, the mounting block is a conventional block structure and is fixed to the ejector plate by conventional bolts, etc., for sliding installation of the sliding ejector pin.

[0027] For example, see Figures 1 to 5 As shown, the ejector plate 2 includes a first needle plate 21 and a second needle plate 22 that are fixed to each other. The first needle plate 21 has a mounting groove corresponding to the mounting block 8 at one end away from the second needle plate 22.

[0028] In this technical solution, the first needle plate and the second needle plate are fixed to each other by conventional bolts, thereby fixing the fixing pin, and the mounting block is fixed to the mounting groove by conventional bolts.

[0029] For example, see Figures 3 to 5 As shown, the sliding ejector pin 5 includes a limiting head, a locking section, a connecting section and an ejector section arranged in sequence, and the radii of the limiting head, locking section, connecting section and ejector section decrease in sequence. The mounting block 8 is provided with countersunk holes corresponding to the limiting head and locking section, and the corresponding end of the reverse ejector pin 7 slides against the locking section.

[0030] In this technical solution, the sliding ejector pin is an integrally formed structure comprising four segments with decreasing radii: a limiting head, a snap-fit ​​segment, a connecting segment, and an ejection segment. The ejection segment slides through the reverse pin plate and abuts against the corresponding end of the moving insert. The connecting segment slides through the second pin plate to connect the connecting segment and the snap-fit ​​segment into one unit. The corresponding end of the reverse ejector pin slides against the snap-fit ​​segment to restrict the movement of the sliding ejector pin, thereby demolding the spring-loaded latch and the moving insert. The limiting head is used to restrict the reset position of the sliding ejector pin.

[0031] For example, see Figures 3 to 5 As shown, the circumferential surface of the snap-fit ​​section is recessed with an annular snap-fit ​​groove, and the mounting block 8 is provided with a snap-fit ​​block 9 that is elastically snapped into the snap-fit ​​groove. A spring 10 is provided between the end of the snap-fit ​​block 9 away from the sliding pin 5 and the inner wall of the mounting groove.

[0032] In this technical solution, the cross-section of the snap-fit ​​groove is V-shaped and is arranged in a ring on the circumference of the snap-fit ​​section. The end of the snap-fit ​​block near the sliding ejector pin has a V-shaped structure corresponding to the snap-fit ​​groove and is elastically abutted against the snap-fit ​​groove by a spring, so that the sliding ejector pin can move with the ejector plate and slide relative to the ejector plate under the action of the reverse ejector pin.

[0033] In actual use, after the molding machine completes injection molding and the front and rear molds open, the molding machine applies a pushing force to the ejector plate using existing methods. The ejector plate drives the fixed ejector pin and the sliding ejector pin to move towards the side closer to the mold core plate. The fixed ejector pin acts on the cable tie surface to achieve cable tie demolding, while the sliding ejector pin acts on the moving insert. The moving insert pushes the cable tie's spring clip away from the fixed insert, reducing the force on the spring clip and avoiding deformation and breakage caused by direct demolding. During the sliding process, the reverse ejector pin gradually approaches the sliding ejector pin until it abuts against the corresponding part of the sliding ejector pin. The sliding ejector pin is limited by the reverse ejector pin, and the locking groove compresses the spring through the locking block. The snap-fit ​​block repositions, the sliding ejector pin slides relative to the ejector plate, the moving insert loses power, the fixed ejector pin continues to push the cable tie out of the mold, the snap-fit ​​teeth of the spring tongue disengage from the moving insert, the fixed insert no longer acts on the spring tongue, the spring tongue as a whole can deform away from the moving insert, reducing the force on the snap-fit ​​teeth, avoiding snap-fit ​​tooth deformation, etc., and improving the pass rate of the cable tie; after the cable tie is demolded, the molding machine drives the ejector plate to reset, after the reverse ejector pin and the sliding ejector pin disengage, the external mold base / mold frame, etc. contact the sliding ejector pin and force the sliding ejector pin to reset, the snap-fit ​​block re-engages in the snap-fit ​​groove, and in the next ejection process, the ejector plate again drives the sliding ejector pin to move through the snap-fit ​​block.

[0034] In summary, the secondary ejection mechanism of this mold has a simple structure. It utilizes the action of a reverse ejector pin that moves synchronously with the fixed ejector pin to disengage the sliding ejector pin from the sliding insert, which in turn disengages the sliding insert from the locking teeth of the spring tongue. The secondary ejection of the mold can be achieved without levers or other transmission structures, which facilitates the design, processing and assembly of the mold.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A secondary ejection mechanism for a mold, characterized in that, The device includes a core plate and an ejector plate slidably disposed relative to the core plate. The core plate contains a forming insert for forming cable tie springs. The forming insert includes a fixed insert fixed to the core plate and a movable insert slidably disposed within the fixed insert. The ejector plate contains a fixed ejector pin that slidably penetrates the core plate and a sliding ejector pin that slidably abuts against the movable insert. A reverse ejector plate is provided at one end of the core plate near the ejector plate, and the reverse ejector plate contains a reverse ejector pin corresponding to the sliding ejector pin.

2. The secondary ejection mechanism of the mold according to claim 1, characterized in that: The mold core plate is provided with a first step groove for installing the fixed insert, and the outer wall of the fixed insert near the reverse needle plate has a first limiting boss corresponding to the first step groove.

3. The secondary ejection mechanism of a mold according to claim 1, characterized in that: The fixed insert is provided with a second step groove for installing the movable insert, and a second limiting platform that slides in the second step groove protrudes from the outer wall of the movable insert near the reverse needle plate.

4. The secondary ejection mechanism of the mold according to claim 1, characterized in that: The sliding ejector pin is slidably mounted on the ejector plate via a mounting block.

5. The secondary ejection mechanism of the mold according to claim 4, characterized in that: The ejector plate includes a first needle plate and a second needle plate fixed to each other. The end of the first needle plate opposite to the second needle plate is provided with an installation groove corresponding to the mounting block.

6. The secondary ejection mechanism of the mold according to claim 5, characterized in that: The sliding ejector pin includes a limiting head, a locking section, a connecting section, and an ejector section arranged in sequence, with the radii of the limiting head, locking section, connecting section, and ejector section decreasing sequentially. The mounting block is provided with countersunk holes corresponding to the limiting head and locking section, and the corresponding end of the reverse ejector pin slides against the locking section.

7. The secondary ejection mechanism of the mold according to claim 6, characterized in that: The circumferential surface of the snap-fit ​​section is recessed with an annular snap-fit ​​groove, and the mounting block is provided with a snap-fit ​​block that is elastically snapped into the snap-fit ​​groove.

8. The secondary ejection mechanism of the mold according to claim 7, characterized in that: A spring is provided between the end of the snap-fit ​​block opposite to the sliding pin and the inner wall of the mounting groove.

Images