Secondary demolding structure and mold

Abstract

The invention relates to the technical field of injection molds, and discloses a secondary demolding structure and a mold, the secondary demolding structure comprises a movable mold and a fixed mold which are matched with each other, a main side loose core is slidably connected to the movable mold, a sliding block body is fixedly connected to the main side loose core, a sliding space is arranged between the sliding block body and the main side loose core, and an ejector plate is slidably connected in the sliding space; the ejector plate is connected with a plurality of auxiliary side loose cores, a translation driving mechanism is connected between the main side loose core and the ejector plate, and when the distance between the main side loose core and the ejector plate is reduced, the translation driving mechanism is used for driving the auxiliary side loose cores to translate along the reverse buckling direction of the product; a locking mechanism used for locking the ejector plate is arranged on the movable mold, and an unlocking mechanism used for releasing the locking mechanism is arranged on the sliding block body. The problem that in the prior art, when a product with a blind hole groove and multiple inverted buckles in different directions is formed, an existing mold cannot form the inverted buckles in the multiple directions in the blind hole groove with a small space is solved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a secondary demoulding structure and a mold. Background Art

[0002] For the attached Figure 1 The automobile drawer structure shown in the figure includes a drawer body and a blind hole groove arranged at the rear end of the drawer body. Several structures are arranged in the blind hole groove, which form a connection seat connected to other parts in the automobile, or form a connection structure connected to other parts in the automobile. At present, when injecting a drawer of this type of structure, due to the existence of the blind hole groove structure, the blind hole groove can be formed by setting a side core pulling structure when designing the mold; in addition, combined with Figure 2 Since some structures in the blind hole groove have undercuts, the direction of the undercuts is different from the mold opening direction for forming the side core pulling of the blind hole groove. Therefore, a secondary core pulling structure is required to be set for forming the undercuts. However, the size of the blind hole groove itself is small, while the number of undercuts in the blind hole groove is large, and the setting directions of different undercuts are different. When the secondary side core pulling structure in the prior art is used to form multiple undercuts in the blind hole groove, on the one hand, there is not enough space to set different secondary side core pulling structures and corresponding driving structures. On the other hand, it is not convenient to simultaneously form undercut structures with different directions, resulting in a complex mold structure and high cost. Summary of the invention

[0003] The present invention aims to provide a secondary demolding structure and a mold to solve the problem in the prior art that when molding a product having a blind hole groove and having multiple undercuts in different directions in the blind hole groove, the existing mold cannot mold multiple undercuts in different directions in a blind hole groove with a smaller space.

[0004] To solve the above problems, the present invention adopts the following technical solutions: a secondary demolding structure, including a movable mold and a fixed mold that cooperate with each other, a main side core puller is slidably connected to the movable mold, a slider body is fixedly connected to the main side core puller, a sliding space is arranged between the slider body and the main side core puller, a pin plate is slidably connected in the sliding space, a number of secondary side core pullers are connected to the pin plate, and a translation drive mechanism equal to the number of secondary side core pullers and arranged one-to-one is connected between the main side core puller and the pin plate. When the distance between the main side core puller and the pin plate is reduced, the translation drive mechanism is used to drive the secondary side core puller to translate along the direction of the product undercut; a locking mechanism for locking the pin plate is provided on the movable mold, and an unlocking mechanism for releasing the locking mechanism is provided on the slider body. When the main side core puller is opened, the unlocking mechanism drives the locking mechanism to unlock after the secondary side core puller completes demolding.

[0005] The principle of this scheme is: the movable mold and the fixed mold are used to form the cavity for forming the drawer body, the main side core pulling cooperates with the movable mold to form the cavity for forming the drawer blind hole groove, and a number of secondary side core pullings are connected to the ejector plate, and the secondary side core pulling structure cooperates with the main side core pulling structure to form the cavity for forming undercuts. According to the actual number of undercuts in the blind hole groove, a corresponding number of secondary side core pullings are set to complete the molding of all undercuts; in addition, the translation drive mechanism set for each secondary side core pulling in the present application, when the distance between the main side core pulling and the ejector plate is reduced, the translation drive mechanism can drive the secondary side core pulling to translate along the direction of the corresponding undercut, so that the corresponding secondary side core pulling can be demoulded smoothly. Therefore, in actual application, for undercuts in different directions, it is only necessary to set the translation direction of the corresponding secondary side core pulling to be the same as the direction of the corresponding undercut, so that the undercut structures in different directions can be accurately molded.

[0006] In addition, in the present application, a pin plate is slidably arranged in the sliding space formed between the slider body and the main side core pulling, and a locking mechanism is arranged on the movable mold, and an unlocking mechanism is arranged on the slider body. When the main side core pulling is opened, the unlocking mechanism unlocks the locking mechanism after the secondary side core pulling completes demolding.

[0007] First, when the mold is in the mold closing state, the locking mechanism locks the ejector plate. When the mold is opened after injection and pressure holding, the movable mold is demolded from the fixed mold, and then the main side core pulling is driven to slide relative to the movable mold to perform the first side core pulling demolding. The main side core pulling is demolded to form a blind hole groove structure; during the demolding process of the main side core pulling structure, the main side core pulling and the slider body fixedly connected to the main side core pulling slide synchronously relative to the movable mold. At this time, the locking mechanism connected to the movable mold locks the ejector plate, so that the ejector plate cannot slide synchronously with the slider body and the main side core pulling. Therefore, when the main side core pulling slides to demold, the distance between the main side core pulling and the ejector plate is reduced. Under the driving action of the translation drive mechanism, the secondary side core pulling structure connected to the ejector plate is demolded by translation relative to the main side core pulling along the undercut direction. Therefore, when the main side core pulling is demolded, the secondary side core pulling can be demolded synchronously for the second time, so as to realize the synchronous demolding of the blind hole groove and the undercut.

[0008] Finally, after the main side core pulling and the secondary side core pulling have completed demolding, as the main side core pulling continues to slide relative to the movable mold, the slider body continues to slide following the main side core pulling, which will drive the unlocking mechanism to drive the locking mechanism to unlock. The ejector plate is no longer locked and can move with the main side core pulling and the slider body to ensure that the main side core pulling can completely exit the blind hole groove, making it convenient to eject the drawer from the movable mold and finally complete all demolding actions.

[0009] The beneficial effects of this application are: 1. A secondary demolding structure can be set in a smaller space: Compared with the prior art, which requires forming multiple undercut structures in a blind hole groove, due to the limited size and space of the blind hole groove and the number of undercuts, when a conventional secondary demolding structure is used, a single secondary side core pulling structure needs to be separately provided with a power drive structure to achieve demolding, resulting in insufficient space in the existing mold structure to set up the demolding structure and the inability to smoothly mold the product. In the present application, by providing an ejector plate structure, all secondary side core pullings are provided on the ejector plate. During the demolding process, when the main side core pulling is demolded, all secondary side core pullings can be demolded synchronously. There is no need to provide a power structure for a single secondary side core pulling as in the prior art. The mold structure is effectively simplified, and multiple undercut structures can be smoothly formed in a blind hole groove with a smaller size range. The mold structure is simpler and the cost is lower.

[0010] 2. Able to simultaneously mold multiple undercut structures in different directions: In the present application, corresponding translation drive mechanisms are provided for undercuts in different directions, so that when the corresponding undercuts are demolded, the secondary side core pulling and demolding can be driven along the corresponding undercut direction. During the movement of the ejector pin relative to the main side core pulling, all undercuts with different directions can be demolded at one time, with high demolding efficiency and precise demolding.

[0011] 3. The demolding sequence can be precisely controlled: In the present application, by setting a locking mechanism and an unlocking mechanism, at the beginning of demolding, the main side core pulling and the secondary side core pulling simultaneously complete the secondary demolding. At this stage, the locking mechanism stably locks the ejector plate, effectively ensuring that the main side core pulling and the secondary side core pulling are stably demolded; when the main side core pulling and the secondary side core pulling have completed demolding, as the main side core pulling continues to slide relative to the movable mold, the locking mechanism can be automatically driven to unlock through the unlocking structure, without the need to additionally set up a power structure to drive the locking mechanism to unlock, thereby further simplifying the mold structure and effectively ensuring that the entire demolding process is completed in an orderly and precise manner.

[0012] 4. The overall structure is stable: In this application, a sliding space is set between the slider body and the main side core puller. The sliding space provides sliding and protection space for the sliding of the ejector plate, and plays a protective role for all secondary side core pullers. The demoulding process is less disturbed by other components, making the product demoulding process more stable.

[0013] Preferably, as an improvement, the locking mechanism includes a latch and a lock tongue, the latch is fixedly connected to the movable mold, the lock tongue is slidably connected to the ejector plate, and the latch is provided with a lock groove that cooperates with the lock tongue.

[0014] In this solution, when the lock tongue is inserted into the lock groove, the latch machine can lock the lock tongue, so that when the main side core puller slides and demolds relative to the movable mold, the latch machine prevents the lock tongue and the ejector plate from sliding synchronously with the main side core puller, causing the ejector plate and the secondary side core puller rotatably connected to the ejector plate to displace with the main side core puller to form an inverted buckle structure. The structure of the lock tongue and the latch machine is simple, the locking effect is stable and the unlocking is convenient.

[0015] Preferably, as an improvement, the unlocking mechanism includes an unlocking seat and a return spring, the unlocking seat is fixedly connected to the slider body, the return spring is arranged between the lock tongue and the ejector plate, and when the lock tongue is not subjected to external force, the lock tongue slides to a state away from the ejector plate under the elastic force of the return spring; the unlocking seat is provided with an unlocking inclined surface, and the lock tongue is provided with a matching inclined surface for matching with the unlocking inclined surface.

[0016] In this solution, the unlocking bevel and the matching bevel cooperate with each other. When the unlocking seat follows the slider body and the main side core pulling to demold, before the main side core pulling and the secondary side core pulling are demolded, the lock tongue is inserted into the lock groove, and the ejector plate cannot move with the main side core pulling to ensure the demolding of the secondary side core pulling. When the main side core pulling and the secondary side core pulling are demolded, as the main side core pulling continues to slide relative to the movable mold, the slider body drives the unlocking seat to slide until it contacts the lock tongue. Under the cooperation of the unlocking bevel and the matching bevel, the unlocking seat pushes the lock tongue to slide out of the lock groove and automatically unlocks. The structure is simple and the unlocking process is precisely controllable.

[0017] Preferably, as an improvement, the number of the locking mechanisms is two, the two locking mechanisms are located on both sides of the ejector plate, and each locking mechanism is correspondingly provided with the unlocking mechanism.

[0018] In this solution, two locking mechanisms are provided, and two unlocking mechanisms are correspondingly provided, so that locking mechanisms and unlocking structures are provided on both sides of the ejector plate, thereby improving the uniformity of force applied during the locking and unlocking process of the ejector plate, and enabling the locking and unlocking of the ejector plate to be carried out stably.

[0019] Preferably, as an improvement, a reset mechanism for driving the ejector plate to reset is provided on the movable mold.

[0020] In this solution, a reset mechanism is provided on the movable mold. When the molding of a product is completed and the mold is closed again, the reset mechanism can drive the ejector plate to reset, so that the secondary side core puller is reset to a state of coordination with the primary side core puller, thereby preventing the secondary side core puller from being in a demolding state during the mold closing process and being damaged by collision.

[0021] Preferably, as an improvement, the reset mechanism includes a reset protrusion fixedly connected to the latch machine, and a reset plane cooperating with the reset protrusion is provided on the ejector plate, and the reset plane is located on a sliding path for the reset protrusion to slide and reset.

[0022] In this solution, the reset protrusion is arranged on the unlocking seat. Since the reset plane is located on the sliding path of the reset protrusion for sliding reset, during the mold closing process, the reset protrusion contacts the reset plane on the ejector plate, which can automatically push the ejector plate to reset. The structure is simple and can automatically complete the reset of the ejector plate.

[0023] Preferably, as an improvement, a slide groove is formed on the ejector plate, a pressure plate is fixedly connected to the ejector plate, and a movable space for the lock tongue to slide is enclosed between the pressure plate and the slide groove; an extension groove connected to the movable space is provided on the outer wall of the ejector plate, the width of the extension groove is smaller than the width of the movable space, and a protrusion is provided on the lock tongue, which slides in cooperation with the extension groove.

[0024] In this solution, by providing a movable space, the sliding of the lock tongue relative to the ejector plate is more precise and smooth, and by utilizing the sliding cooperation between the protrusion and the extension groove, when the ejector plate is in a locked state, the protrusion protrudes out of the extension groove and is inserted into the lock groove. When the ejector plate is unlocked, the protrusion retracts into the extension groove, and the locking relationship between the protrusion and the lock groove is automatically released, ensuring that locking and unlocking can be completed stably.

[0025] Preferably, as an improvement, a guide column is fixedly connected to the main side core pulling device, and a circular sliding hole that slidably cooperates with the guide column is provided on the ejector plate.

[0026] In this solution, the guide column is used to provide limit and guidance for the sliding of the ejector plate relative to the main side core pulling, effectively ensuring the precise operation of the entire mechanism.

[0027] Preferably, as an improvement, the translation drive mechanism includes a slide and an inclined square hole, the inclined square hole is arranged on the main side core pulling, the slide is slidably connected to the ejector plate, and a square rod is fixedly connected to the secondary side core pulling, the square rod is slidably matched with the inclined square hole, and the end of the square rod away from the secondary side core pulling is rotatably connected to the slide.

[0028] In this solution, a square rod with a square cross-section is connected to the secondary side core pulling, which is easy to process and has a stable structure. At the same time, a square sliding hole that cooperates with the square rod is opened on the main side core pulling. The square sliding hole can not only provide guidance for the sliding of the other rod, but also prevent the square rod from rotating relative to the main side core pulling during the sliding process. When the distance between the main side core pulling and the ejector plate is reduced, under the action of the inclined square hole on the other rod, the secondary side core pulling can be demolded along the corresponding undercut direction, and the end of the square rod connected to the slide seat rotates relative to the slide seat. The slide seat automatically slides relative to the ejector plate under the action of the square rod to cooperate with the translation dimension generated during the demolding process of the secondary side core pulling.

[0029] A mold comprises the secondary demoulding structure.

[0030] In this solution, by setting the secondary demolding structure in the mold, the secondary demolding structure can be set in a smaller space to mold a product having a blind hole groove and a blind hole groove with multiple undercuts, and the multiple undercuts can be in different directions, which effectively simplifies the structure of the mold in molding such products and reduces the design difficulty and the overall cost of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the drawer formed in this embodiment.

[0032] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0033] Figure 3 It is a schematic diagram of the mold closing state in the first embodiment of the present invention.

[0034] Figure 4 It is a schematic diagram of the upward viewing angle after the drawer is hidden in the first embodiment of the present invention.

[0035] Figure 5 It is a schematic diagram of the connection between the main side core pulling and the slider body in the first embodiment of the present invention.

[0036] Figure 6 Schematic diagram of the slider body in the first embodiment of the present invention.

[0037] Figure 7 It is a schematic diagram of the connection between the ejector plate and all secondary side core pullers in the first embodiment of the present invention.

[0038] Figure 8 It is a schematic diagram of the connection between one of the secondary side core pulling and the slide seat in the first embodiment of the present invention.

[0039] Fig. 9 It is a schematic diagram of the connection between the latch, the lock tongue and the ejector plate in the first embodiment of the present invention.

[0040] Fig.10 This is a partial schematic diagram of the connection between the lock tongue and the ejector plate in the first embodiment of the invention (the pressure plate is hidden).

[0041] Fig.11 Schematic diagram of embodiment 2 of the invention.

[0042] Fig.12 It is a schematic diagram of the connection between the secondary side core pulling and the slide seat in the third embodiment of the present invention. DETAILED DESCRIPTION

[0043] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: drawer body 1, blind hole groove 101, undercut 102, main side core pulling 2, slider body 3, sliding space 301, ejector plate 4, guide groove 401, activity space 402, guide column 5, cylinder 6, drive block 7, secondary side core pulling 8, expansion joint 801, slide seat 9, square rod 10, convex head 1001, reference seat 11, latch machine 12, lock groove 1201, sliding groove 1202, reset slope 1203, lock tongue 13, protrusion 1301, matching slope 13011, pressure plate 14, unlocking seat 15, unlocking slope 1501, reset spring 16, reset protrusion 17.

[0044] A drawer structure used in a car in the prior art is as follows Figure 1 and Figure 2 As shown, it includes a drawer body 1 and a blind hole groove 101 arranged at the rear end of the drawer body, and a plurality of connection structures with undercuts 102 are arranged in the blind hole groove 101, and the direction of the undercuts 102 is different from the opening direction of the blind hole groove 101. When forming the drawer structure, it is necessary to set a side core pull along the length direction of the drawer for forming the blind hole groove 101, and it is also necessary to set a secondary side core pull along the direction of the undercut 102 for forming the undercut 102.

[0045] Embodiment 1 This embodiment is as shown in the attached Figure 3 As shown: A secondary demoulding structure includes a movable mold and a fixed mold that cooperate with each other, and the movable mold and the fixed mold are used to form a cavity of a drawer structure ( Figure 3 The movable mold and the fixed mold structure are not shown in the figure. The movable mold is laterally slidably connected with the main side core puller 2. The main side core puller 2 cooperates with the movable mold and the fixed mold to form the blind hole groove 101. The right side of the main side core puller 2 is fixedly connected with the slider body 3 by screws. Figure 4 , Figure 5 and Figure 6 The main body of the slider body 3 is in a "コ" shape, and a sliding space 301 is formed between the slider body 3 and the main side core puller 2. The sliding space 301 is connected with a thimble plate 4 for horizontal sliding. In order to control the thimble plate 4 to slide horizontally smoothly and accurately, combined with Figure 7 A guide column 5 arranged transversely is fixedly connected to the slider body 3 by screws, and a circular sliding hole is provided on the ejector plate 4 to slide with the guide column 5. The sliding cooperation between the guide column 5 and the circular sliding hole provides a guide for the sliding of the ejector plate 4. At least two guide columns 5 are provided to improve the stability of the guide. Figure 3 and Figure 4 In this embodiment, an oil cylinder 6 is fixedly connected to the movable mold by screws, a driving block 7 is fixedly connected to the output shaft of the oil cylinder 6 by screws, and the driving block 7 is fixedly connected to the slider body 3 by screws. The oil cylinder 6 is used to drive the slider body 3 and the main side core pulling 2 to slide relative to the movable mold to control the smooth demoulding of the main side core pulling 2.

[0046] Combination Figure 4 and Figure 7 A plurality of secondary side core pulls 8 are connected to the side of the ejector plate 4 facing the main side core pull 2, and the number of the secondary side core pulls 8 is equal to the number of undercuts 102 in the blind hole groove 101 and they are arranged one by one. A translation drive mechanism equal to the number of the secondary side core pulls 8 and arranged one by one is connected between the main side core pull 2 ​​and the ejector plate 4. When the distance between the main side core pull 2 ​​and the ejector plate 4 is reduced, the translation drive mechanism is used to drive the secondary side core pull 8 to translate along the direction of the corresponding undercut 102 to be formed, so that the secondary side core pull 8 can cooperate with the main side core pull 2 ​​and the movable mold and the fixed mold to demold and form the corresponding undercut 102. In this embodiment, the translation drive mechanism includes a slide 9 and an inclined square hole. The inclined square hole is arranged on the main side core pulling 2. A guide groove 401 cooperating with the slide 9 is opened on the ejector plate 4. The slide 9 is slidably connected in the guide groove 401, and the sliding direction of the slide 9 along the guide groove 401 is the same as the direction of the correspondingly formed undercut 102; the secondary side core pulling 8 is integrally formed with a square rod 10, the square rod 10 is slidably matched with the inclined square hole, and the end of the square rod 10 away from the secondary side core pulling 8 is rotatably connected with the slide 9, combined with Figure 8 In order to facilitate installation, reduce processing difficulty and control the precise sliding of the slide 9, in this embodiment, a reference seat 11 is fixedly connected to the ejector plate 4 by screws, and a guide groove 401 is opened on the reference seat 11. The slide 9 slides with the reference seat 11. An "Ω"-shaped hinge groove is opened on the slide 9, and a convex head 1001 that rotates with the hinge groove is provided at the end of the square rod 10, so that the square rod 10 can be stably hinged to the slide 9 by relying on the cooperation between the convex head 1001 and the hinge groove. At the same time, in this embodiment, the hinge groove and the guide groove 401 are set to be perpendicular to each other to improve the stability and accuracy of the hinge between the square rod 10 and the slide 9.

[0047] Combination Figure 3 , Figure 7 , Fig. 9 and Fig.10 , a locking mechanism for locking the ejector plate 4 is provided on the movable mold, and an unlocking mechanism for releasing the locking mechanism is provided on the slider body 3. When the main side core pull 2 ​​is in the process of opening the mold, the unlocking mechanism drives the locking mechanism to unlock after the secondary side core pull 8 is demolded. Specifically, the locking mechanism in this embodiment includes a latch 12 and a lock tongue 13. The lock tongue 13 is slidably connected to the ejector plate 4. The latch 12 is fixedly connected to the movable mold by screws. A lock groove 1201 cooperating with the lock tongue 13 is provided on the latch 12. When the lock tongue 13 is inserted into the lock groove 1201, the latch 12 locks the ejector plate 4 by locking the lock tongue 13 to prevent the ejector plate 4 from moving away from the drawer body 1. For the sliding connection between the lock tongue 13 and the ejector plate 4, such as Fig. 9 and Fig.10As shown, a slide groove is opened on the ejector plate 4, and a pressure plate 14 is fixedly connected to the ejector plate 4 by screws. The pressure plate 14 is located at the top of the slide groove, so that a movable space 402 for the lock tongue 13 to slide is formed between the pressure plate 14 and the slide groove. An extension groove connected to the movable space 402 is opened on the side wall of the ejector plate 4, and the width of the extension groove is smaller than the width of the movable space 402. A protrusion 1301 is integrally formed on the lock tongue 13, and the protrusion 1301 can pass through the extension groove and then extend to the outside of the ejector plate 4. After the protrusion 1301 extends outside the extension groove, it can be inserted into the lock groove 1201 of the latch 12. When the latch 12 and the protrusion 1301 are locked, the latch 12 locks the ejector plate 4.

[0048] like Fig.10 As shown, the unlocking mechanism includes an unlocking seat 15 and a return spring 16. The unlocking seat 15 is fixedly connected to the slider body 3 by screws. The return spring 16 is located in the active space 402 and between the ejector plate 4 and the lock tongue 13. When the lock tongue 13 is not subjected to external force, the protrusion 1301 slides to a state away from the ejector plate 4 under the elastic force of the return spring 16, that is, the protrusion 1301 extends to a state outside the extension groove. Figure 7 and Fig.10 The unlocking seat 15 is L-shaped as a whole, and a sliding groove 1202 is provided on the locking machine 12. The unlocking seat 15 slides with the sliding groove 1202. An unlocking inclined surface 1501 is provided on the unlocking seat 15, and a matching inclined surface 13011 for matching with the unlocking inclined surface 1501 is provided on the protruding portion 1301. The matching inclined surface 13011 is located on the sliding path of the unlocking inclined surface 1501 on the unlocking seat 15. When the unlocking inclined surface 1501 slides to contact with the matching inclined surface 13011, the protruding portion and the locking tongue 13 can be pushed to slide into the activity space 402, so that the locking tongue 13 exits the locking groove 1201 and completes the unlocking; at the same time, a reset inclined surface 1203 is provided on the end of the locking machine 12 away from the main side core pulling 2. The reset inclined surface 1203 cooperates with the matching inclined surface 13011, and can drive the locking tongue 13 and the protruding portion to be reinserted into the locking groove 1201 during the mold closing process. In addition, in this embodiment, a reset mechanism for driving the ejector plate 4 to reset is provided on the movable mold, and the reset mechanism includes a reset protrusion 17 integrally formed on the unlocking seat 15, and a reset plane cooperating with the reset protrusion 17 is provided on the pressure plate 14 (in this embodiment, the reset plane is the outer side surface of the pressure plate 14), and the reset plane is located on the sliding path of the reset protrusion 17 for sliding reset.

[0049] In the actual application process of this embodiment, in the mold opening stage after the injection and pressure holding processes after mold closing, the movable mold and the fixed mold are first separated from each other for demolding, and then the oil cylinder 6 pushes the slider body 3 relative to the movable mold along the Figure 3When the slider body 3 slides, it pulls the main side core pull 2 ​​to slide to the right relative to the movable mold to complete a demoulding. When the main side core pull 2 ​​is demoulded, a blind hole groove 101 of the drawer is formed; when the main side core pull 2 ​​slides to the right relative to the movable mold, the protrusion on the lock tongue 13 is inserted into the lock groove 1201 to lock the ejector plate 4, and the lock machine 12 is fixedly connected to the movable mold. Therefore, when the main side core pull 2 ​​slides relative to the movable mold, the ejector plate 4 cannot slide to the right with the main side core pull 2. At this time, the ejector plate 4 slides to the left relative to the main side core pull 2, and the ejector plate 4 and the main side core pulling 2 are reduced, and the square rod 10 slides relatively with the inclined square hole. Under the action of the inclined square hole, the square rod 10 rotates relative to the slide seat 9, and the slide seat 9 slides along the guide groove 401, so that the secondary side core pulling 8 at one end of the square rod 10 away from the ejector plate 4 is translated along the direction of the corresponding undercut 102, and the secondary side core pulling 8 is disengaged from the corresponding undercut 102 to complete the secondary demoulding. When the secondary side core pulling 8 is demoulded, the undercut 102 of the connection structure in the blind hole groove 101 is formed, and the primary demoulding and the secondary demoulding are completed synchronously, so that the demoulding process can be completed smoothly.

[0050] When the oil cylinder 6 pushes the slider body 3 and the main side core puller 2 to slide relative to the movable mold edge Figure 3 When sliding to the right, the slider body 3 will also drive the unlocking seat 15 to slide synchronously. When the main side core pull 2 ​​and the secondary side core pull 8 have completed demoulding, the oil cylinder 6 continues to push the slider body 3 and the main side core pull 2 ​​to slide relative to the movable mold, and as the slider body 3 continues to slide, the unlocking inclined surface 1501 on the unlocking seat 15 contacts the matching inclined surface 13011 on the protruding part, and the protruding part and the lock tongue 13 are automatically slid into the active space 402 by the pressure of the unlocking seat 15, so that the protruding part automatically withdraws from the lock groove 1201. At this time, the locking effect of the locking machine 12 on the ejector plate 4 disappears. After the ejector plate 4 is not locked by the locking machine 12, it can slide rightward with the slider body 3 and the main side core pull 2, so that the main side core pull 2 ​​completely withdraws from the blind hole groove 101. When the protruding part leaves the action range of the locking machine 12, under the elastic force of the reset spring 16, the protruding part protrudes out of the groove again, and then the ejector pin in the prior art can be used to eject the drawer upward to complete a product molding.

[0051] When the mold is closed for the next product molding after the first product molding is completed, the oil cylinder 6 pulls the slider body 3 along the Figure 3When the slider body 3 slides to the left (the slider body 3 has slid to the right to the right limit position before mold closing), first, the reset plane of the pressure plate 14 will contact the reset protrusion 17 on the button machine 12. Under the blocking action of the reset protrusion 17, the ejector plate 4 moves away from the main side core puller 2 and resets. When the ejector plate 4 resets, it drives the secondary side core puller 8 to reset; then, as the slider body 3 continues to reset under the action of the cylinder 6, the reset slope 1203 on the button machine 12 will contact the matching slope 13011 on the protruding part, and the protruding part slides into the active space 402 under the squeezing force of the reset slope 1203. When the protruding part slides to the locking groove 1201 position, the protruding part slides out of the extending groove under the elastic force of the reset spring 16, so that the protruding part is reset to the state of being inserted into the locking groove 1201. Finally, after the main side core puller is reset, the cylinder 6 stops driving, all parts are reset to the mold closing state, and the next injection molding can be carried out.

[0052] A mold includes the above-mentioned secondary demolding structure. By setting a secondary demolding structure in the mold, not only can a product with a blind hole groove 101 structure be molded, but also a product with an undercut 102 in the blind hole groove 101 that is different in direction from the blind hole groove 101 can be smoothly molded. The number of undercuts 102 can be multiple, and the directions of the multiple undercuts 102 can also be different. The overall structure of the mold is simple, and the mold opening and closing actions are accurate and stable. In addition, it should be pointed out that in this embodiment, only the molded drawer structure is used as an example to illustrate the mold in this solution. Of course, without departing from the core design of the mold in this solution, it can also be used to mold products similar to those with secondary demolding in the drawer structure. These all belong to the protection scope of this solution and will not be repeated here.

[0053] Embodiment 2 The difference between the second embodiment and the first embodiment is that: Fig.11 As shown, in order to improve the stability of locking and unlocking the ejector plate 4, a locking mechanism and an unlocking mechanism are provided on both sides of the ejector plate 4 in this embodiment.

[0054] Embodiment 3 The difference between the third embodiment and the second embodiment is that: Fig.12 As shown, in this embodiment, a plurality of expansion joints 801 are provided on the secondary side core pulling 8 to improve the anti-deformation performance of the secondary side core pulling 8 and further improve the molding stability of the secondary side core pulling 8 .

[0055] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A secondary demoulding structure, comprising a movable mold and a fixed mold that cooperate with each other, characterized in that: A main side core pull is slidably connected to the movable mold, a slider body is fixedly connected to the main side core pull, a sliding space is arranged between the slider body and the main side core pull, an ejector plate is slidably connected in the sliding space, a number of secondary side core pulls are connected to the ejector plate, and a translation driving mechanism whose number is equal to the number of secondary side core pulls and which is arranged one-to-one is connected between the main side core pull and the ejector plate. When the distance between the main side core pull and the ejector plate is reduced, the translation driving mechanism is used to drive the secondary side core pull to translate along the direction of the undercut; a locking mechanism for locking the ejector plate is arranged on the movable mold, and an unlocking mechanism for releasing the locking mechanism is arranged on the slider body. When the main side core pull is opened, the unlocking mechanism drives the locking mechanism to unlock after the secondary side core pull is demoulded.

2. A secondary demoulding structure according to claim 1, characterized in that: The locking mechanism comprises a latch and a lock tongue, wherein the latch is fixedly connected to the movable mold, the lock tongue is slidably connected to the ejector plate, and a lock groove cooperating with the lock tongue is arranged on the latch.

3. A secondary demoulding structure according to claim 2, characterized in that: The unlocking mechanism includes an unlocking seat and a return spring. The unlocking seat is fixedly connected to the slider body. The return spring is arranged between the lock tongue and the ejector plate. When the lock tongue is not subjected to external force, the lock tongue slides to a state away from the ejector plate under the elastic force of the return spring. The unlocking seat is provided with an unlocking inclined surface, and the lock tongue is provided with a matching inclined surface for matching with the unlocking inclined surface.

4. A secondary demoulding structure according to claim 1, characterized in that: The number of the locking mechanisms is two, and the two locking mechanisms are located on both sides of the ejector plate, and each locking mechanism is correspondingly provided with the unlocking mechanism.

5. The secondary demoulding structure according to claim 2, characterized in that: The movable mold is provided with a reset mechanism for driving the ejector plate to reset.

6. A secondary demoulding structure according to claim 5, characterized in that: The reset mechanism comprises a reset protrusion fixedly connected to the button machine, and a reset plane matched with the reset protrusion is arranged on the ejector plate, and the reset plane is located on the sliding path of the reset protrusion for sliding reset.

7. The secondary demoulding structure according to claim 2, characterized in that: A slide groove is formed on the ejector plate, a pressure plate is fixedly connected to the ejector plate, and a movable space for the lock tongue to slide is formed between the pressure plate and the slide groove; an extension groove connected to the movable space is formed on the outer wall of the ejector plate, the width of the extension groove is smaller than the width of the movable space, and a protrusion is formed on the lock tongue, which slides in cooperation with the extension groove.

8. The secondary demoulding structure according to claim 1, characterized in that: A guide column is fixedly connected to the main side core puller, and a circular sliding hole which is slidably matched with the guide column is provided on the ejector plate.

9. The secondary demoulding structure according to claim 1, characterized in that: The translation driving mechanism includes a slide and an inclined square hole, the inclined square hole is arranged on the main side core pulling, the slide is slidably connected to the ejector plate, the secondary side core pulling is fixedly connected with a square rod, the square rod is slidably matched with the inclined square hole, and the end of the square rod away from the secondary side core pulling is rotatably connected to the slide.

10. A mold, characterized in that: It comprises a secondary demoulding structure as described in any one of claims 1 to 9.

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