A slider secondary mold opening mechanism

Abstract

The utility model provides a slider secondary die mechanism, including the shovel base connected with the movable template, and the slider slidingly connected with the fixed template. The lower end of the shovel base is connected with an inclined guide pillar, which is slidingly connected in the inclined guide hole provided in the slider. One end of the slider is connected with an inner shrink reverse insertion insert. The shovel base drives the slider to retreat and open the mold through the inclined guide pillar. The inner shrink reverse insertion insert includes a primary die insert and a secondary die insert coaxially sleeved. The primary die insert is fixedly connected with the slider through a first fastener, and the secondary die insert is axially slidingly connected to the outside of the primary die insert. The secondary die insert is connected in the counterbore through hole through a second fastener, and there is a predetermined gap between the head of the second fastener and the bottom of the counterbore through hole. The utility model simultaneously realizes the step-by-step core pulling and demolding of the inner shrink reverse insertion insert by setting the primary die insert and the secondary die insert coaxially sleeved, integrates the functions of the traditional two sets of slider systems in the same slider structure, and simplifies the mold structure.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a slider secondary mold opening mechanism. Background Technology

[0002] In injection molding, it is common to encounter products with undercuts on the side. These undercuts are located inside the product or inside the groove, which means that when the mold is opened, the part with the undercut cannot be directly pulled out of the product. It is required that the part being molded must first make an inward movement towards the central axis of the product before it moves laterally, so as to disengage from the undercut.

[0003] Currently, to solve the demolding problem of inward-shrinking undercuts, the common solution in the industry is to design two independent drive systems: one slider to handle external core pulling, and another inward-shrinking mechanism to handle internal demolding. This mold structure is extremely complex, with high design, manufacturing, and assembly difficulties and costs. Multiple mechanisms occupy a large amount of mold space, posing challenges to the overall layout and strength of the mold. During mold opening, high coordination of movements is required, increasing the difficulty of debugging and maintenance.

[0004] Therefore, the above problems urgently need to be solved. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a slider secondary mold opening mechanism, which can realize the secondary mold opening action of first pulling the core laterally and then shrinking inward within a single slider. It has a compact structure, reliable operation, and effectively solves the problem of product shrinkage and undercut demolding.

[0006] Technical Solution: To achieve the above objectives, this utility model provides a slider secondary mold opening mechanism, including a shovel base connected to a moving template and a slider slidably connected to a fixed template. The lower end of the shovel base and the upper end of the slider abut against each other via an inclined surface. An inclined guide post is connected to the lower end of the shovel base, and the inclined guide post is slidably connected within an inclined guide hole provided in the slider. One end of the slider is connected to an inwardly recessed undercut insert. The shovel base drives the slider to retract and open the mold via the inclined guide post. The inwardly recessed undercut insert includes a primary mold opening insert and a secondary mold opening insert coaxially sleeved. The primary mold opening insert is fixedly connected to the slider via a first fastener, and the secondary mold opening insert is axially slidably connected to the outside of the primary mold opening insert. The slider is provided with a countersunk through hole, and the secondary mold opening insert is connected to the countersunk through hole via a second fastener, with a predetermined gap between the head of the second fastener and the bottom of the countersunk through hole. A first elastic mechanism is provided between the slider and the secondary mold opening insert. The first elastic mechanism is located in the countersunk hole of the slider. The first elastic mechanism applies a pushing force to the secondary mold opening insert, so that the secondary mold opening insert remains in its original position during the first mold opening. The fixed platen is provided with an insert locking mechanism, which is used to lock the secondary mold opening insert in the mold closing state.

[0007] This invention achieves step-by-step core-pulling and demolding of the inwardly recessed undercut insert by setting coaxially fitted primary and secondary mold-opening inserts. It integrates the functions of two traditional independent slider systems into a single slider structure, simplifying the mold structure. In the mold-closed state, the insert locking mechanism reliably locks the secondary mold-opening insert. At this time, the first elastic mechanism is in a compressed state, and the gap between the head of the second fastener and the bottom of the countersunk hole reserves travel space for subsequent secondary mold-opening actions. In the initial stage of mold opening, as the moving template moves the shovel base backward, the inclined guide post drives the slider to slide laterally along the fixed template. Because the secondary mold-opening insert is locked by the insert locking mechanism, the primary mold-opening insert moves synchronously with the slider. Its relative movement with the secondary mold-opening insert triggers an inward retraction action, achieving initial demolding of the product's inner undercut. When the slider moves to the preset position, the insert locking mechanism releases the lock on the secondary mold opening insert. The compressed first elastic mechanism applies a pushing force to the secondary mold opening insert, keeping it in place until the head of the second fastener abuts against the bottom of the countersunk hole (at this point, the primary mold opening insert has completed its internal retraction and demolding). Then, the slider pulls the secondary mold opening insert through the second fastener, causing it to be pulled out, completing the secondary mold opening action and completely detaching the internally retracted undercut insert from the product. This invention achieves step-by-step demolding through a single slider-driven internally retracted undercut insert design, reducing the number of mold parts, lowering manufacturing and assembly difficulty, ensuring precise coordination of actions during mold opening, avoiding interference problems caused by traditional dual-system linkage, and improving the stability of mold operation.

[0008] Furthermore, in the aforementioned slider secondary mold opening mechanism, the insert locking mechanism includes a locking block, which is hinged to the fixed template via a pivot.

[0009] The bottom surface of the slider has a V-groove, and the locking block has a protrusion that mates with the V-groove. A flexible thrust mechanism is connected to the fixed template. The flexible thrust mechanism acts on one end of the locking block to move the protrusion into the V-groove. The V-groove has an inverted V-shaped cross-section.

[0010] A locking boss is provided on the end of the locking block near the secondary mold opening insert. During mold closing, the locking boss locks the secondary mold opening insert. During mold opening, the inclined guide post drives the slider to retract, and the inclined surface of the V-groove presses against the protrusion, causing the locking block to rotate around the pivot. The locking block is compressed by the elastic thrust mechanism, and the locking boss gradually disengages from the secondary mold opening insert. When the slider moves until the protrusion has completely slid out of the V-groove, the locking boss and the secondary mold opening insert are completely separated, completing the unlocking action. During mold closing, as the slider slides back along the fixed mold plate, the protrusion on the locking block slides towards the V-groove. The locking block, under the action of the elastic thrust mechanism, causes the protrusion to slide into the V-groove. When the slider is fully reset to the mold closing position, the protrusion is embedded in the V-groove, and simultaneously, the locking boss resets to the locking position of the secondary mold opening insert, forming a reliable lock on the secondary mold opening insert and ensuring the structural stability of the inward-shrinking undercut insert in the mold closing state. The elastic thrust mechanism ensures that the locking boss of the locking block reliably engages with the secondary mold opening insert during mold closing, preventing accidental unlocking due to vibration during the mold closing process. The hinged design of the locking block makes its movement flexible and has little impact on the sliding resistance of the slider, ensuring a smooth mold opening process.

[0011] Furthermore, in the aforementioned slider secondary mold opening mechanism, the locking boss is designed with a straight surface on the side acting on the secondary mold opening insert, and a sloped surface on the side away from the secondary mold opening insert. The straight surface of the locking boss engages with the side wall of the secondary mold opening insert near the slider. The slider has a groove for the locking boss to extend into. The straight surface of the locking boss ensures that it blocks the secondary mold opening insert when the mold is closed. The groove on the slider provides space for the locking boss, preventing interference between the locking block and the slider, and ensuring that the locking boss can accurately embed and lock the secondary mold opening insert.

[0012] Furthermore, in the aforementioned slider secondary mold opening mechanism, the elastic thrust mechanism is set as a thrust spring. The linear thrust generated by the thrust spring continuously acts on the locking block, ensuring a tight fit between the protrusion and the V-groove, and facilitating maintenance and replacement during long-term use, thus reducing the maintenance cost of the mechanism.

[0013] Furthermore, in the aforementioned secondary mold-opening mechanism of the slider, the primary mold-opening insert includes an ejector component. The ejector component has a first ejection ramp and a second ejection ramp on its outer periphery, symmetrically arranged on both sides of the axis of the primary mold-opening insert, and inclined towards the center of the primary mold-opening insert. The secondary mold-opening insert has a through groove corresponding to the outer periphery of the primary mold-opening insert. A first retractable component and a second retractable component are slidably connected to the first and second ejection ramps, respectively. A first limiting pin and a second limiting pin are respectively connected to the secondary mold-opening insert. The first limiting pin and the second limiting pin respectively restrict the axial movement of the first and second retractable components.

[0014] The first and second extraction ramps, symmetrically arranged on the outer periphery of the ejector, provide guidance for the radial retraction of the first and second retractable parts. During the initial mold opening stage, as the initial mold opening insert moves laterally with the slider, the first and second retractable parts are connected to the secondary mold opening insert via the first and second limiting pins, and the secondary mold opening insert is locked stationary. The movement of the ejector causes the first and second retractable parts to radially retract, achieving the inward retraction demolding of the product's inner undercut. The first and second limiting pins effectively restrict the axial freedom of the first and second retractable parts, ensuring they can only move radially, guaranteeing the smoothness and precision of the retraction action.

[0015] Furthermore, in the aforementioned slider secondary mold opening mechanism, the first and second extraction inclined surfaces are respectively provided with a first T-slot and a second T-slot, and the first and second retracting parts are respectively provided with T-shaped sliding edges that mate with the first and second T-slots. The first and second retracting parts are slidably connected to the first and second extraction inclined surfaces through the first and second T-slots, respectively. Through the mating structure of the T-slots and T-shaped sliding edges, a stable sliding connection is formed between the first and second retracting parts and the extraction parts, ensuring guiding accuracy during the sliding process, allowing the retracting parts to move inward along the inclined surface, preventing the retracting parts from detaching from the extraction inclined surface during movement, ensuring the consistency of the inward shrinkage amount, and improving the product demolding quality.

[0016] Furthermore, in the aforementioned slider secondary mold opening mechanism, the first limiting pin and the second limiting pin are respectively provided with a first limiting plane and a second limiting plane along their axial directions. The secondary mold opening insert is provided with a first ejector screw and a second ejector screw that mate with the first limiting plane and the second limiting plane, and the first ejector screw and the second ejector screw are threadedly connected to the threaded holes provided in the secondary mold opening insert.

[0017] The first and second limiting planes cooperate with the first and second set screws to prevent the limiting pin from coming out during operation.

[0018] Furthermore, in the aforementioned slider secondary mold opening mechanism, the first inner shrinking member and the second inner shrinking member are respectively provided with a first undercut and a second undercut at one end of their extensions into the secondary mold opening insert. The first undercut and the second undercut are arranged in an arc shape, and the first undercut and the second undercut together with one end of the secondary mold opening insert constitute an undercut forming part.

[0019] The curved design of the first and second undercut sections allows for precise alignment with the curved contours of the product's inner undercut, ensuring the molding quality of the undercut portion. Together with one end of the secondary mold insert, they form a complete undercut molding section, integrally molding the undercut structure during injection molding, avoiding molding marks or flash issues caused by splicing multiple parts. During mold opening, the radial inward movement of the first and second undercut sections gradually detaches from the inside of the product's undercut, reducing demolding resistance and preventing damage or deformation of the undercut due to forced demolding, thus improving product yield.

[0020] Furthermore, in the aforementioned slider-type secondary mold-opening mechanism, the first elastic mechanism includes a compression spring connected between the slider and the secondary mold-opening insert. The secondary mold-opening insert is connected to a guide post, and the compression spring is located outside the guide post. During mold closing, the slider and the secondary mold-opening insert abut against each other, compressing the compression spring. The guide post guides the extension and retraction of the compression spring, preventing it from bending or twisting during compression or rebound, thus ensuring the axial transmission efficiency of the spring force. During mold closing, the slider and the secondary mold-opening insert abut against each other, compressing the compression spring and storing elastic potential energy. During mold opening, when the insert locking mechanism unlocks, the compression spring releases its potential energy, pushing the secondary mold-opening insert to remain in its original position, thus achieving relative movement between the primary and secondary mold-opening inserts.

[0021] Furthermore, in the aforementioned secondary mold-opening mechanism for the slider, a wear-resistant plate is provided on the inclined surface where the slider and the shovel base abut. The slider abuts against the shovel base via the wear-resistant plate. The wear-resistant plate is made of high-strength wear-resistant material, and its surface has a low coefficient of friction and excellent wear resistance. Providing a wear-resistant plate at the inclined abutment point between the slider and the shovel base reduces wear and extends the service life of both the slider and the shovel base.

[0022] As can be seen from the above technical solution, this utility model has the following beneficial effects: The slider-type secondary mold opening mechanism of this utility model integrates lateral core pulling and inward retraction demolding functions into a single slider structure, simplifying the overall mold layout, reducing the number of parts, and lowering the complexity and cost of mold design, manufacturing, and assembly. Through the coaxially fitted primary and secondary mold opening inserts, the step-by-step precise core pulling and demolding of the inward retraction undercut insert is achieved, avoiding the interference problems that may occur with traditional dual-system linkage, and effectively improving the stability and reliability of mold operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the secondary mold opening mechanism of the slider of this utility model; Figure 2 This is a top view of the slider secondary mold opening mechanism of this utility model; Figure 3 for Figure 2 The sectional view shown is along line AA. Figure 4 for Figure 2 The BB-directed sectional view is shown below; Figure 5 for Figure 3 The enlarged view shown below; Figure 6 This is a schematic diagram of the structure of the locking block; Figure 7 An exploded view of the recessed inverted insert; Figure 8 This is a schematic diagram of the structure of the extraction component; Figure 9 This is a schematic diagram of the structure of the first-stage mold insert; Figure 10 for Figure 3 The enlarged view shown is a partial view.

[0024] In the diagram: 1. Shovel base; 11. Angled guide post; 2. Slider; 21. Countersunk through hole; 22. V-groove; 23. Wear-resistant plate; 3. Inwardly recessed undercut insert; 31. One-time mold opening insert; 311. Pull-out part; 3111. First pull-out slope; 3112. Second pull-out slope; 3113. First T-slot; 3114. Second T-slot; 313. First inwardly recessed part; 3131. First undercut part; 3132. Second undercut part; 314. Second inwardly recessed part. Shrinking part, 315, First limiting pin, 3151, First limiting plane, 316, Second limiting pin, 32, Secondary mold opening insert, 321, First ejector screw, 322, Second ejector screw, 33, First fastener, 34, Second fastener, 35, First elastic mechanism, 351, Compression spring, 352, Guide post, 36, Insert locking mechanism, 361, Locking block, 3611, Protrusion, 3612, Locking boss, 362, Elastic thrust mechanism. Detailed Implementation

[0025] Example

[0026] like Figure 1-4The illustrated slider secondary mold opening mechanism includes a shovel base 1 connected to a moving template and a slider 2 slidably connected to a fixed template. The lower end of the shovel base 1 and the upper end of the slider 2 abut against each other via an inclined surface. An inclined guide post 11 is connected to the lower end of the shovel base 1, and the inclined guide post 11 is slidably connected within an inclined guide hole provided in the slider 2. One end of the slider 2 is connected to an inwardly recessed undercut insert 3. The shovel base 1 drives the slider 2 to retract and open the mold via the inclined guide post 11. The inwardly recessed undercut insert 3 includes a primary mold opening insert 31 and a secondary mold opening insert 32 coaxially sleeved. The primary mold opening insert 31 is fixedly connected to the slider 2 via a first fastener 33, and the secondary mold opening insert 32 is axially slidably connected to the outside of the primary mold opening insert 31. The slider 2 is provided with a countersunk through hole 21, and the secondary mold opening insert 32 is connected to the countersunk through hole 21 via a second fastener 34, with a predetermined gap between the head of the second fastener 34 and the bottom of the countersunk through hole 21. A first elastic mechanism 35 is provided between the slider 2 and the secondary mold opening insert 32. The first elastic mechanism 35 is located in the countersunk hole of the slider 2. The first elastic mechanism 35 applies a pushing force to the secondary mold opening insert 32, so that the secondary mold opening insert 32 remains in its original position during the first mold opening. An insert locking mechanism 36 is provided on the fixed mold plate, which is used to lock the secondary mold opening insert 32 in the mold closing state.

[0027] like Figure 5-6 The slider secondary mold opening mechanism shown includes an insert locking mechanism 36, which includes a locking block 361. The locking block 361 is hinged to the fixed template via a rotating shaft.

[0028] The bottom surface of the slider 2 is provided with a V-groove 22, and the locking block 361 is provided with a protrusion 3611 that cooperates with the V-groove 22. The fixed template is connected to an elastic thrust mechanism 362. The elastic thrust mechanism 362 acts on one end of the locking block 361 to move the protrusion 3611 toward the V-groove 22.

[0029] The locking block 361 has a locking boss 3612 at one end near the secondary mold opening insert 32. When the mold is closed, the locking boss 3612 locks the secondary mold opening insert 32.

[0030] like Figure 6 The sliding block secondary mold opening mechanism shown has a locking boss 3612 with a straight surface on one side acting on the secondary mold opening insert 32, and a sloped surface on the side away from the secondary mold opening insert 32. The straight surface of the locking boss 3612 engages with the side wall of the secondary mold opening insert 32 near the sliding block 2. The sliding block 2 has a groove for the locking boss 3612 to extend into. The straight surface of one side of the locking boss 3612 prevents it from blocking the secondary mold opening insert 32 when the mold is closed. The groove on the sliding block 2 provides space for the locking boss 3612, preventing interference between the locking block 361 and the sliding block 2, and ensuring that the locking boss 3612 can accurately embed and lock the secondary mold opening insert 32.

[0031] In this embodiment, the elastic thrust mechanism 362 is configured as a thrust spring.

[0032] like Figure 7 The illustrated slider-type secondary mold opening mechanism includes a primary mold opening insert 31 comprising an ejector 311. The ejector 311 has a first ejection inclined surface 3111 and a second ejection inclined surface 3112 on its outer periphery. These two inclined surfaces are symmetrically arranged on both sides of the axis of the primary mold opening insert 31, and are inclined towards the center of the primary mold opening insert 31. The secondary mold opening insert 32 has a through groove corresponding to the outer periphery of the primary mold opening insert 31. The first ejection inclined surface 3111 and the second ejection inclined surface 3112 are slidably connected to a first retracting component 313 and a second retracting component 314, respectively. A first limiting pin 315 and a second limiting pin 316 are respectively connected between the first retracting component 313 and the second retracting component 314 and the secondary mold opening insert 32. The first limiting pin 315 and the second limiting pin 316 respectively restrict the axial movement of the first inner retractor 313 and the second inner retractor 314.

[0033] like Figure 8 The slider secondary mold opening mechanism shown has a first T-slot 3113 and a second T-slot 3114 respectively provided on the first extraction inclined surface 3111 and the second extraction inclined surface 3112. The first inner shrinking member 313 and the second inner shrinking member 314 are respectively provided with T-shaped sliding edges that cooperate with the first T-slot 3113 and the second T-slot 3114. The first inner shrinking member 313 and the second inner shrinking member 314 are slidably connected to the first extraction inclined surface 3111 and the second extraction inclined surface 3112 respectively through the first T-slot 3113 and the second T-slot 3114.

[0034] like Figure 9 The slider secondary mold opening mechanism shown has a first limiting plane 3151 and a second limiting plane axially provided for the first limiting pin 315 and the second limiting pin 316, respectively. The secondary mold opening insert 32 is provided with a first ejector screw 321 and a second ejector screw 322 that cooperate with the first limiting plane 3151 and the second limiting plane. The first ejector screw 321 and the second ejector screw 322 are threadedly connected to the threaded holes provided in the secondary mold opening insert 32.

[0035] The first limiting plane 3151 and the second limiting plane cooperate with the first set screw 321 and the second set screw 322 to prevent the limiting pin from coming out during operation.

[0036] In this embodiment, the first inner shrinking member 313 and the second inner shrinking member 314 are respectively provided with a first undercut portion 3131 and a second undercut portion 3132 at one end of the second mold opening insert 32. The first undercut portion 3131 and the second undercut portion 3132 are arranged in an arc shape, and the first undercut portion 3131 and the second undercut portion 3132 together with one end of the second mold opening insert 32 form an undercut forming part.

[0037] like Figure 10 The slider secondary mold opening mechanism shown includes a first elastic mechanism 35, which includes a compression spring 351 connected between the slider 2 and the secondary mold opening insert 32. The secondary mold opening insert 32 is connected to the guide post 352, and the compression spring 351 is located on the outside of the guide post 352.

[0038] In this embodiment, a wear-resistant plate 23 is provided on the inclined surface of the slider 2 and the shovel base 1, and the slider 2 abuts against the shovel base 1 through the wear-resistant plate 23. The wear-resistant plate 23 is made of high-strength wear-resistant material, such as a high-hardness alloy material that has undergone quenching and hardening treatment.

[0039] The working principle of this utility model is as follows: Mold Closure State: The moving mold plate (not shown in the figure) and the fixed mold plate (not shown in the figure) are closed. The shovel base 1 presses against the slider 2. Under the action of the elastic thrust mechanism 362, the locking block 361's protrusion 3611 is engaged in the V-groove 22 of the slider. At the same time, the locking boss 3612 presses against the secondary mold opening insert 32, locking the secondary mold opening insert 32. At this time, the compression spring 351 in the first elastic mechanism 35 is in a compressed state, storing elastic potential energy. The head of the second fastener 34 maintains a preset gap with the bottom of the countersunk through hole 21, reserving stroke for the subsequent sliding of the secondary mold opening insert 32. The primary mold opening insert 31 and the slider 2 are rigidly connected by the first fastener 33. The first undercut part 3131 and the second undercut part 3132 on the first inner shrink part 313 and the second inner shrink part 314 on the pull-out part 311, together with the end of the secondary mold opening insert 32, constitute the product undercut forming part, which is embedded in the mold cavity.

[0040] Initial mold opening stage (first mold opening): The moving mold plate drives the shovel base 1 to retract, and the shovel base 1 drives the slider 2 to slide backward along the fixed mold plate through the inclined guide post 11. The V-groove 22 on the bottom surface of the slider 2 moves with the slider 2, and its inclined surface presses against the protrusion 3611 of the locking block 361, forcing the locking block 361 to rotate around the pivot and compress the elastic thrust mechanism 362 until the protrusion 3611 slides out of the V-groove 22 and the locking boss 3612 disengages from the secondary mold opening insert 32, and the locking boss 3612 releases its lock on the secondary mold opening insert 32. After unlocking, the compressed compression spring 351 releases its elastic potential energy and, guided by the guide post 352, applies a thrust to the secondary mold opening insert 32, keeping the secondary mold opening insert 32 in its original position. During this process, the ejector 311 of the first mold-opening insert 31 moves away from the mold cavity, and its first ejection ramp 3111 and second ejection ramp 3112 generate radial inward contraction forces on the first inward contraction insert 313 and the second inward contraction insert 314, respectively. Under the action of the inward contraction force, the first inward contraction insert 313 and the second inward contraction insert 314 retract inward along the guide of the first limiting pin 315 and the second limiting pin 316 towards the central axis, so that the first undercut 3131 and the second undercut 3132 disengage from the undercut structure inside the product, completing the initial inward contraction demolding action. Until the head of the second fastener 34 abuts against the bottom of the countersunk through hole 21, the second mold-opening stage begins.

[0041] Secondary mold opening stage: When the head of the second fastener 34 abuts against the bottom of the countersunk through hole 21, the second fastener 34 drives the secondary mold opening insert 32 to move, causing the end of the secondary mold opening insert 32 to be pulled out from the undercut structure inside the product, completing the secondary demolding action. At this point, both the primary mold opening insert 31 and the secondary mold opening insert 32 of the inward undercut insert 3 have completely detached from the product undercut. Subsequently, the slider 2 continues to drive the entire inward undercut insert 3 to move laterally backward, achieving complete mold opening, and the product can be smoothly ejected.

[0042] Repeat the mold closing process, and the mechanism returns to the initial mold closing state, preparing for the next injection molding.

[0043] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A slider secondary mold opening mechanism, characterized in that: The device includes a shovel base (1) connected to a moving template and a slider (2) slidably connected to a fixed template; the lower end of the shovel base (1) and the upper end of the slider (2) abut against each other via an inclined surface; the lower end of the shovel base (1) is connected to an inclined guide post (11), which is slidably connected to an inclined guide hole provided in the slider (2); one end of the slider (2) is connected to an inwardly recessed undercut insert (3); the shovel base (1) drives the slider (2) to retract and open the mold via the inclined guide post (11); the inwardly recessed undercut insert (3) includes a primary mold opening insert (31) and a secondary mold opening insert (32) coaxially sleeved; the primary mold opening insert (31) is fixedly connected to the slider (2) via a first fastener (33), and the secondary mold opening insert (32) is axially slidably connected to the slider (2). The outer side of the primary mold opening insert (31); the slider (2) is provided with a countersunk through hole (21), and the secondary mold opening insert (32) is connected to the countersunk through hole (21) by a second fastener (34). There is a predetermined gap between the head of the second fastener (34) and the bottom of the countersunk through hole (21); a first elastic mechanism (35) is provided between the slider (2) and the secondary mold opening insert (32). The first elastic mechanism (35) is provided in the countersunk hole provided by the slider (2). The first elastic mechanism (35) keeps the secondary mold opening insert (32) in its original position during the primary mold opening; the fixed template is provided with an insert locking mechanism (36). The insert locking mechanism (36) is used to lock the secondary mold opening insert (32) in the mold closing state.

2. The slider secondary mold opening mechanism according to claim 1, characterized in that: The insert locking mechanism (36) includes a locking block (361), which is hinged to the fixed template via a pivot. The bottom surface of the slider (2) is provided with a V-groove (22), and the locking block (361) is provided with a protrusion (3611) that cooperates with the V-groove (22); the fixed template is connected to an elastic thrust mechanism (362); the elastic thrust mechanism (362) acts on one end of the locking block (361) to make the protrusion (3611) move toward the V-groove (22); The locking block (361) has a locking boss (3612) at one end near the secondary mold insert (32); when the mold is closed, the locking boss (3612) locks the secondary mold insert (32).

3. The slider secondary mold opening mechanism according to claim 2, characterized in that: The locking boss (3612) is set as a straight surface on the side of the secondary mold insert (32), and the locking boss (3612) is set as an inclined surface on the side away from the secondary mold insert (32). The straight surface of the locking boss (3612) engages with the side wall of the secondary mold insert (32) near the slider (2); the slider (2) is provided with a groove for the locking boss (3612) to extend into.

4. The slider secondary mold opening mechanism according to claim 2, characterized in that: The elastic thrust mechanism (362) is configured as a thrust spring.

5. The slider secondary mold opening mechanism according to claim 1, characterized in that: The primary mold-opening insert (31) includes an ejector (311); the ejector (311) has a first ejection inclined surface (3111) and a second ejection inclined surface (3112) on its outer periphery. The first ejection inclined surface (3111) and the second ejection inclined surface (3112) are symmetrically arranged on both sides of the axis of the primary mold-opening insert (31), and the first ejection inclined surface (3111) and the second ejection inclined surface (3112) are inclined towards the center of the primary mold-opening insert (31); the secondary mold-opening insert (32) has a similar arrangement to the primary mold-opening insert (31) on its outer periphery. The corresponding through groove is provided; the first extraction inclined surface (3111) and the second extraction inclined surface (3112) are respectively slidably connected to the first inner shrinking part (313) and the second inner shrinking part (314); the first inner shrinking part (313) and the second inner shrinking part (314) are respectively connected to the secondary mold insert (32) by the first limiting pin (315) and the second limiting pin (316); the first limiting pin (315) and the second limiting pin (316) respectively restrict the axial movement of the first inner shrinking part (313) and the second inner shrinking part (314).

6. The slider secondary mold opening mechanism according to claim 5, characterized in that: The first extraction inclined surface (3111) and the second extraction inclined surface (3112) are respectively provided with a first T-shaped groove (3113) and a second T-shaped groove (3114). The first inner shrinking member (313) and the second inner shrinking member (314) are respectively provided with T-shaped sliding edges that cooperate with the first T-shaped groove (3113) and the second T-shaped groove (3114). The first inner shrinking member (313) and the second inner shrinking member (314) are slidably connected to the first extraction inclined surface (3111) and the second extraction inclined surface (3112) through the first T-shaped groove (3113) and the second T-shaped groove (3114).

7. The slider secondary mold opening mechanism according to claim 5, characterized in that: The first limiting pin (315) and the second limiting pin (316) are respectively provided with a first limiting plane (3151) and a second limiting plane in the axial direction; the secondary mold opening insert (32) is provided with a first ejector screw (321) and a second ejector screw (322) that cooperate with the first limiting plane (3151) and the second limiting plane, and the first ejector screw (321) and the second ejector screw (322) are threadedly connected to the threaded hole provided in the secondary mold opening insert (32).

8. The slider secondary mold opening mechanism according to claim 6, characterized in that: The first inner shrinking part (313) and the second inner shrinking part (314) are respectively provided with a first undercut part (3131) and a second undercut part (3132) at one end of the second mold opening insert (32). The first undercut part (3131) and the second undercut part (3132) are arranged in an arc shape. The first undercut part (3131) and the second undercut part (3132) together with one end of the second mold opening insert (32) form an undercut forming part.

9. The slider secondary mold opening mechanism according to claim 1, characterized in that: The first elastic mechanism (35) includes a compression spring (351) connected between the slider (2) and the secondary mold opening insert (32). The secondary mold opening insert (32) is connected to the guide post (352), and the compression spring (351) is located on the outside of the guide post (352). When the mold is closed, the slider (2) and the secondary mold opening insert (32) abut against each other, causing the compression spring (351) to be compressed.

10. The slider secondary mold opening mechanism according to claim 1, characterized in that: The slider (2) and the shovel base (1) are provided with a wear-resistant plate (23) on the inclined surface, and the slider (2) abuts against the shovel base (1) through the wear-resistant plate (23).

Images