Injection mold for in-mold cover and demoulding method

Abstract

The present application discloses an injection mold with in-mold cover and a demoulding method, the injection mold comprises a movable mold, the surface of the movable mold is provided with a product cavity, an ejector is provided in the movable mold, the outer sleeve of the ejector is provided with an ejector sleeve, the outer sleeve of the ejector sleeve is provided with a threaded core, one end of the ejector, the ejector sleeve and the threaded core are respectively connected to the movable mold, and the other ends of the ejector, the ejector sleeve and the threaded core are respectively extended into the product cavity; the movable mold is provided with a thread-removing mechanism, a first ejection mechanism, a cover-closing mechanism and a second ejection mechanism; the thread-removing mechanism is used to drive the threaded core to detach from the product cavity; the first ejection mechanism is used to eject the plastic product from the product cavity; the cover-closing mechanism is used to cover the plastic product; the second ejection mechanism is used to drive the ejector to extend out of the ejector sleeve to drive the plastic product to detach from the ejector sleeve. The present application can complete the injection molding, thread-removing, cover-closing and ejection of plastic products, which can greatly reduce the investment cost of the enterprise and the work intensity of the operators.

Description

Technical Field

[0001] The present application belongs to the field of injection molds, and more specifically, relates to an injection mold for in-mold covering and a demoulding method. Background Art

[0002] At present, the plastic bottle caps of toiletries commonly seen on the market mostly consist of two parts: a bottle cap base and a top cover, which are connected by a hinge point, such as the bottle caps of shampoo and shower gel. After the production of such bottle caps is completed, in order to prevent the hinge point from breaking and to facilitate storage, the top cover is usually closed after the injection molding is completed.

[0003] There are two common ways to close the lid:

[0004] 1. After the injection molding is completed, the lid is closed manually, that is, the operator manually closes the top cover; this method often exceeds the thermoplastic coagulation period during lid closing, affects the lid closing effect, and even causes the hinge point of the bottle cap to break, which directly affects the production quality of the product; in addition, the use of manual operation undoubtedly increases the labor cost of the enterprise, which is not suitable for the current market environment.

[0005] 2. Use an injection molding machine with special functions or upgrade the technology of ordinary injection molding machines, so that the injection molding machine can pause and continue to eject during the ejection process, that is, the injection molding machine has the function of ejecting twice, and at the same time, design an automatic cover closing mechanism on the mold to automatically close the cover in the mold. Although this method can reduce labor costs, it costs a lot to purchase injection molding machines with special functions or upgrade the technology of ordinary injection molding machines, which greatly increases the investment cost of the enterprise.

[0006] Therefore, there is an urgent need for an injection mold that can complete injection molding, ejection, and lid closing on a common injection molding machine. Summary of the invention

[0007] In order to solve the problems existing in the above-mentioned prior art, on the one hand, the present application provides an injection mold with an in-mold cover, comprising a movable mold, a product cavity is provided on the upper surface of the movable mold, an ejector is provided in the movable mold, an ejector sleeve is provided on the outer side of the ejector, a threaded core is provided on the outer side of the ejector sleeve, one end of the ejector, the ejector sleeve and the threaded core are respectively connected to the movable mold, and the other ends of the ejector, the ejector sleeve and the threaded core are respectively extended into the product cavity; a thread-removing mechanism, a first ejection mechanism, a cover-closing mechanism and a second ejection mechanism are provided in the movable mold; the thread-removing mechanism is connected to the threaded core to drive the threaded core to be separated from the product cavity; the first ejection mechanism is respectively connected to the ejector and the ejector sleeve to eject the plastic product out of the product cavity; the cover-closing mechanism is connected to the movable mold to cover the plastic product; the second ejection mechanism is connected to the ejector, and is used to drive the ejector to extend out of the ejector sleeve to drive the plastic product to be separated from the ejector sleeve.

[0008] As a further improvement of the present application, a first fixed plate and a second fixed plate are provided in the movable mold, the second fixed plate is arranged above the first fixed plate, the first fixed plate is connected to the threaded core, the other end of the threaded core passes through the second fixed plate and extends into the product cavity, and the product cavity is arranged on the upper surface of the second fixed plate.

[0009] As a further improvement of the present application, the thread stripping mechanism includes a driving rod, one end of which is connected to the first fixed plate, and the other end of which extends out of the upper surface of the movable mold. A transmission shaft is provided on the first fixed plate, and an end of the transmission shaft away from the first fixed plate is adjustably threadedly connected to the second fixed plate, and the driving rod can drive the threaded core and the transmission shaft to rotate synchronously; the driving rod drives the transmission shaft to rotate, thereby driving the second fixed plate to move in a direction away from the first fixed plate.

[0010] As a further improvement of the present application, a first gear is provided on the driving rod, and a plurality of second gears are provided on the first fixed plate, and the first gear is meshingly connected with the second gear; a third gear is provided on the transmission shaft, and the third gear is meshingly connected with the second gear; a fourth gear is provided on the threaded core, and the fourth gear is meshingly connected with the second gear.

[0011] As a further improvement of the present application, a second ejector plate and a first ejector plate are sequentially provided below the first fixed plate, one end of the ejector is connected to the first ejector plate, the ejector passes through the second ejector plate, the first fixed plate and the second fixed plate in sequence, and the end of the ejector away from the first ejector plate can extend into the product cavity, one end of the ejector sleeve is connected to the second ejector plate, the ejector sleeve passes through the first fixed plate and the second fixed plate in sequence, and the end of the ejector sleeve away from the second ejector plate can extend into the product cavity.

[0012] As a further improvement of the present application, the first ejection mechanism includes an ejection cylinder, which is connected to the first fixed plate; a connecting block is provided on the first ejector plate, and the connecting block is connected to the ejection cylinder; a push rod is provided on the first ejector plate, and a bayonet is provided on the second ejector plate, which is detachably engaged with the push rod, and the push rod can drive the second ejector plate to move.

[0013] As a further improvement of the present application, a piston rod is provided in the ejection cylinder, the piston rod passes through the connecting block, and the piston rod and the connecting block are loosely matched; a limit block is provided at one end of the piston rod extending out of the connecting block, and the limit block can abut against the lower surface of the connecting block.

[0014] As a further improvement of the present application, a third fixing plate is provided below the second ejector plate, the third fixing plate is connected to the first fixing plate, the second ejection mechanism includes a cover plate arranged on the side wall of the third fixing plate, the cover plate is sleeved on the outside of the push rod and the bayonet pin; a mounting block is provided on the second ejector plate, the bayonet pin is slidably limitedly connected to the mounting block, a slot is provided on the push rod, the bayonet pin can be inserted into the slot, the inner side wall of the cover plate is provided with a receiving slot adapted to the bayonet pin, and the push rod can squeeze the bayonet pin into the receiving slot; a first elastic member is provided in the mounting block, the first elastic member is connected to the bayonet pin, and the first elastic member is used to push the bayonet pin into the slot.

[0015] As a further improvement of the present application, a pin reset mechanism is provided in the movable mold, and the pin reset mechanism includes a first reset guide rod and a second reset guide rod, one end of the first reset guide rod is connected to the first ejector plate, and the other end of the first reset guide rod passes through the second ejector plate, the first fixed plate and the second fixed plate in sequence, one end of the second reset guide rod is connected to the second ejector plate, and the other end of the second reset guide rod passes through the first fixed plate and the second fixed plate in sequence; a second elastic member is sleeved on the outer side of the first reset guide rod, and the second elastic member passes through the second ejector plate and the first fixed plate in sequence, one end of the second elastic member is connected to the first ejector plate, and the other end of the second elastic member is connected to the second fixed plate.

[0016] On the other hand, the present application also provides a demoulding method for the above-mentioned injection mold, which is performed by an injection molding machine, and an ejection mechanism is provided on the injection molding machine. The demoulding method comprises the following steps:

[0017] To remove threads, when the mold is opened, the injection molding machine drives the driving rod to move, and the driving rod drives the thread core and the transmission shaft to rotate synchronously. The transmission shaft rotates to drive the second fixed plate to move away from the first fixed plate, thus completing the thread removal of the plastic product.

[0018] Pre-ejection: the ejection cylinder drives the first ejector plate to move, and the first ejector plate moves with the push rod, and the push rod pushes the second ejector plate to move through the bayonet pin, and the ejector and the ejector sleeve extend out of the surface of the second fixed plate to push the product out of the product cavity;

[0019] Closing the cover: the closing mechanism works to close the cover on the product;

[0020] The product is demoulded, and the ejection mechanism of the injection molding machine pushes the first ejector plate, and the first ejector plate drives the push rod to disengage from the latch, so that the second ejector plate is separated from the first ejector plate, and the first ejector plate drives the ejector to extend out of the ejector sleeve, so that the product is separated from the ejector sleeve.

[0021] The beneficial effects of this application are:

[0022] In the present application, a thread-removing mechanism, a first ejection mechanism, a cover-closing mechanism, and a second ejection mechanism are provided in the movable mold. The thread-removing structure can be used to remove threads from the injection molded product. The cooperation of the first ejection mechanism and the cover-closing mechanism can be used to close the cover of the injection molded product. The second ejection mechanism can be used to eject the injection molded product out of the injection mold to complete the demoulding of the product. When the present application is working, the thread-removing, cover-closing, and ejection actions of the plastic product can be completed with a single ejection action of the injection molding machine. No manual participation in the cover-closing work is required, which greatly reduces the labor intensity of the operator and improves production efficiency. At the same time, the ordinary injection molding machine that can be used in the present application does not need to be modified or purchased separately, which greatly reduces the investment cost of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the solutions in the present application or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the structure of the thread removal mechanism in the embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of the structure after the thread removal is completed in the embodiment of the present application;

[0027] Figure 4 yes Figure 1 A magnified view of part A;

[0028] Figure 5 This is a schematic diagram of the cover plate structure in an embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of the structure of the cover closing mechanism in the embodiment of the present application;

[0030] Figure 7 This is a schematic diagram of the structure of the plastic product after demoulding in the embodiment of the present application;

[0031] Figure 8 yes Figure 7 Enlarged view of part B. DETAILED DESCRIPTION

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0035] like Figure 1-8 As shown, an injection mold with an in-mold cover comprises a movable mold and a fixed mold, a product cavity 1 is provided on the surface of the movable mold, an ejector pin 2 is provided in the movable mold, an ejector pin sleeve 3 is provided on the outer side of the ejector pin 2, a threaded core 4 is provided on the outer side of the ejector pin sleeve 3, and the ejector pin 2, the ejector pin sleeve 3 and the threaded core 4 are clearance-matched, that is, the three can undergo axial displacement relative to each other; one end of the ejector pin 2, the ejector pin sleeve 3 and the threaded core 4 are respectively connected to the movable mold, and the other ends can extend into the product cavity 1. The movable mold is provided with a thread stripping mechanism 5, a first ejection mechanism 6, a cover closing mechanism 7, a second ejection mechanism and an ejector pin reset mechanism 8. The thread stripping mechanism 5 is connected to the thread core 4 and is used to drive the thread core 4 to separate from the product cavity 1; the first ejection mechanism 6 is respectively connected to the ejector pin 2 and the ejector pin sleeve 3 and is used to eject the injection molded plastic product from the product cavity 1; the cover closing mechanism 7 is connected to the movable mold and is used to cover the plastic product; the second ejection mechanism is connected to the ejector pin 2 and is used to drive the ejector pin 2 to extend out of the ejector pin sleeve 3 to drive the plastic product to separate from the ejector pin sleeve 3; the ejector pin reset mechanism 8 is used to drive the ejector pin 2 and the ejector pin sleeve 3 to reset after the plastic product is demoulded.

[0036] Before injection molding, the injection mold is first installed on the injection molding machine; during injection molding, the injection molding machine drives the movable mold and the fixed mold to close, and the plastic product is injection molded in the product cavity 1; after injection molding is completed, the injection molding machine drives the movable mold and the fixed mold to separate, and the demoulding process of the plastic product is as follows:

[0037] In the first step, when the injection molding machine drives the movable mold and the fixed mold to open the mold, the driving mechanism of the injection molding machine drives the thread removal mechanism 5 to work. Under the action of the driving force, the thread removal mechanism 5 drives the thread core 4 to separate from the product cavity 1, so that the plastic product completes the thread removal operation.

[0038] In the second step, the first ejection mechanism 6 starts to work, driving the ejector pin 2 and the ejector sleeve 3 to move, thereby ejecting the formed plastic product from the product cavity 1.

[0039] In the third step, the cover closing mechanism 7 works to close the plastic product ejected from the product cavity 1.

[0040] In the fourth step, the second ejection mechanism drives the ejector pin 2 to move, so that the ejector pin 2 is ejected again, and the ejector sleeve 3 is extended. At the same time, the closed plastic product is ejected from the ejector sleeve 3, so that the plastic product automatically falls off, and the entire demoulding work is completed.

[0041] The movable mold is provided with a second fixing plate 9, a first fixing plate 10, a second ejector plate 11, a first ejector plate 12 and a third fixing plate 13 from top to bottom, and the first fixing plate 9 is fixedly connected with the third fixing plate 13 by means of limit screws. The product cavity 1 is provided on the upper surface of the second fixing plate 11, the first fixing plate 9 is used to install the thread removal mechanism 5 and the first ejection mechanism 6, the second ejector plate 11 is used to install the ejector sleeve 3, the first ejector plate 12 is used to install the ejector 2, and the third fixing plate 13 is fixedly connected with the injection molding machine during operation, and is used to fix the movable mold on the injection molding machine for operation.

[0042] The threaded core 4 is mounted on the first fixing plate 10 , and the other end of the threaded core 4 passes through the second fixing plate 9 and extends into the product cavity 1 .

[0043] The ejector pin 2 is fixedly mounted on the first ejector plate 12 , and passes through the second ejector plate 11 , the first fixing plate 10 and the second fixing plate 9 in sequence. One end of the ejector pin 2 away from the first ejector plate 11 can extend into the product cavity 1 .

[0044] The ejector sleeve 3 is fixedly mounted on the second ejector plate 11 , and the ejector sleeve 3 passes through the first fixing plate 10 and the second fixing plate 9 in sequence. One end of the ejector sleeve 3 away from the second ejector plate 11 can extend into the product cavity 1 .

[0045] The thread removing mechanism 5 includes a driving rod 51 and a transmission shaft 52. One end of the driving rod 51 is fixedly connected to the injection molding machine, and the injection molding machine can drive the driving rod 51 to move. The other end of the driving rod 51 passes through the second fixed plate 6 and is rotatably limitedly connected to the first fixed plate 10; a first gear 53 is sleeved on one end of the driving rod 51 close to the first fixed plate 10, and a plurality of second gears 54 are installed on the first fixed plate 10, and the second gears 54 can rotate in situ.

[0046] The transmission shaft 52 is installed on the first fixed plate 10 , and the transmission shaft 52 is rotatably limitedly connected to the first fixed plate 10 . A third gear 55 is sleeved on one end of the transmission shaft 52 close to the first fixed plate 10 , and the other end of the transmission shaft 52 is adjustably threadedly connected to the second fixed plate 9 .

[0047] A fourth gear 56 is sleeved on one end of the threaded core 4 close to the first fixed plate 10, and the second gear 54 is meshed with the first gear 53, the third gear 55 and the fourth gear 56 respectively, that is, the first gear 53, the second gear 54, the third gear 55 and the fourth gear 56 can rotate synchronously.

[0048] The dethreading process of the injection mold is as follows: after the injection molding machine completes the injection molding, the injection mold is driven to open the mold, and under the driving force of the injection molding machine, the driving rod 51 is driven to move, so that the first gear 53 rotates, thereby driving the second gear 54, the third gear 55 and the fourth gear 56 to rotate synchronously; the third gear 55 drives the transmission shaft 52 to rotate, and the transmission shaft 52 rotates through the threaded connection with the second fixed plate 9, driving the second fixed plate 9 to move away from the first fixed plate 10, so that the product cavity 1 moves with the plastic product in the direction away from the threaded core 4; during the movement of the second fixed plate 9, the fourth gear 56 rotates to drive the threaded core 4 to rotate synchronously, and the threaded core 4 will rotate and disengage from the threaded part of the molded plastic product during the rotation process, thereby completing the dethreading of the plastic product.

[0049] In other embodiments, the driving rod 51 may also use any other existing transmission method to drive the driving rod 52 and the threaded core 4 to rotate, for example, a pulley structure.

[0050] The first ejection mechanism 6 includes an ejection oil cylinder 61 and a connecting block 62. The ejection oil cylinder 61 is fixedly mounted on the side wall of the first fixed plate 10, and the connecting block 62 is fixedly mounted on the side wall of the first ejector plate 12. The connecting block 62 is connected to the ejection oil cylinder 61. The first ejector plate 12 is provided with a push rod 63, and the second ejector plate 11 is provided with a bayonet 64. The bayonet 64 is detachably engaged with the push rod 63, and the push rod 63 can drive the bayonet 64 and the second ejector plate 11 to move. When the injection mold completes the thread removal operation, the ejection oil cylinder 61 starts to work, driving the connecting block 62 to move, and the connecting block 62 drives the first ejector plate 12 to move. Under the cooperation of the push rod 63 and the bayonet 64, the second ejector plate 11 moves synchronously with the first ejector plate 12, so that the ejector 2 and the ejector sleeve 3 move synchronously, so that the ejector 2 and the ejector sleeve 3 eject the molded plastic product out of the product cavity 1, which is convenient for the subsequent closing operation.

[0051] The ejection oil cylinder 61 is provided with a piston rod 65, which passes through the connecting block 62, and the piston rod 65 and the connecting block 62 are in clearance fit, and one end of the piston rod 65 extending from the connecting block 62 is provided with a limit block 66, and the limit block 66 can abut against the lower end surface of the connecting block 62. When the ejection oil cylinder 61 drives the piston rod 65 to move, the piston rod 65 can drive the limit block 66 to abut against the connecting block 62, so that the limit block 66 drives the connecting block 62 to move, and then drives the first ejector plate 12 and the second ejector plate 11 to move synchronously to eject the plastic product out of the product cavity 1.

[0052] In this embodiment, a U-shaped groove 67 is provided on the side wall of the connecting block 62, and the piston rod 65 passes through the U-shaped groove 67 and can slide in the U-shaped groove 67; in other embodiments, a through hole can also be provided on the connecting block 62, and one end of the piston rod 65 passes through the through hole.

[0053] If the ejector pin 2 is to be extended out of the ejector sleeve 3, the second ejector plate 11 cannot move synchronously with the first ejector plate 12 when the second ejection mechanism is working. The second ejection mechanism includes a cover plate 14 fixedly mounted on the side wall of the third fixed plate. The cover plate 14 is sleeved on the outside of the push rod 63 and the bayonet 64. A limiting groove 141 is provided on the inner side of the cover plate 14. The push rod 63 can slide in the limiting groove 141, and one end of the bayonet 64 abuts against the side wall of the limiting groove 141. The side wall of the limiting groove 141 is provided with a receiving groove 142. When the push rod 63 slides in the limiting groove 141, the bayonet 64 can be pushed into the receiving groove 142, so that the bayonet 64 is separated from the push rod 63. The second ejector plate 11 is provided with a mounting block 111, and the bayonet 64 is limitedly installed on the mounting block 111, and the bayonet 64 can slide on the mounting block 111, and a slot 631 is provided on the side wall of the push rod 63, and one end of the bayonet 64 can be inserted into the slot 631, so that the push rod 63 can push the second ejector plate 11 to move; a first elastic member (not shown in the figure) is provided in the mounting block 111, and the first elastic member is connected to the bayonet 64, and the first elastic member is used to push the bayonet 64 into the slot 631.

[0054] It should be noted that before the injection mold is demoulded, under the elastic force of the first elastic member, one end of the latch pin 64 is latched into the latch groove 631 , and the other end abuts against the side wall of the limiting groove 141 .

[0055] During the demoulding process of the plastic product, when the ejection oil cylinder 61 starts to work, the connection block 62 drives the first ejector plate 12 and the push rod 63 to move, and the push rod 63 drives the bayonet 64 to slide in the limiting groove 141 of the cover plate 14, and the bayonet 64 moves with the second ejector plate 11, so that the ejector 2 and the ejector sleeve 3 eject the plastic product out of the product cavity 1. During the sliding process of the push rod 63 in the limiting groove 141, when the bayonet 64 moves to the position corresponding to the receiving groove 142, because the weight of the second ejector plate 11 is much greater than the elastic force of the first elastic member, the push rod 63 will push the bayonet 64 into the receiving groove 142, so that the bayonet 64 is separated from the push rod 63, and the second ejector plate 11 can no longer move with the first ejector plate 12.

[0056] When the ejection mechanism of the injection molding machine starts to work, the push rod 63 has been disengaged from the latch 64; therefore, the ejection mechanism of the injection molding machine can only push the first ejector plate 12 to move, while the second ejector plate 11 will not move; so that the ejector 2 extends out of the ejector sleeve 3, and the plastic product is ejected and demolded at the same time.

[0057] In this embodiment, when the ejector pin 2 and the ejector sleeve 3 eject the plastic product out of the product cavity 1, the push rod 63 also pushes the latch 64 into the receiving groove 142, that is, when the first ejection mechanism 6 finishes working, the push rod 63 pushes the latch 64 into the receiving groove 142.

[0058] The ejector reset mechanism 8 includes a first reset guide rod 81 and a second reset guide rod 82. The first reset guide rod 81 is fixedly mounted on the first ejector plate 12, and the first reset guide rod 81 passes through the second ejector plate 11, the first fixed plate 10, and the second fixed plate 9 in sequence; the second reset guide rod 82 is fixedly mounted on the second ejector plate 11, and the second reset guide rod 82 passes through the first fixed plate 10 and the second fixed plate 9 in sequence. A second elastic member 83 is sleeved on the outer side of the first reset guide rod 81, and the second elastic member 83 passes through the second ejector plate 11 and the first fixed plate 10 in sequence. One end of the second elastic member 83 is connected to the first ejector plate 12, and the other end of the second elastic member 83 is connected to the second fixed plate 9. The first reset guide rod 81 can limit and guide the movement direction of the first ejector plate 12, and the second reset guide rod 82 can limit and guide the movement direction of the second ejector plate 11.

[0059] During the demoulding process of the plastic product, the movement of the first ejector plate 12 will squeeze the second elastic member 83; after the plastic product is demoulded, the ejector cylinder 61 is reset, so that the limit block 66 is separated from the connecting block 62; after the driving force for demoulding disappears, the ejector mechanism of the injection molding machine is reset, and under the elastic force of the second elastic member 83, the first ejector plate 12 is driven to reset, thereby driving the ejector 2 to reset; during the reset movement of the first ejector plate 12, the push rod 63 slides in the limit groove 141, and when the push rod 63 moves to the position corresponding to the slot 631 and the bayonet 64, under the action of the first elastic member, the bayonet 64 is pushed to insert into the slot 631, so that the push rod 63 can drive the bayonet 64 to move, and the bayonet 64 moves with the second ejector plate 11, thereby completing the reset of the ejector sleeve 3.

[0060] The cover closing mechanism 7 comprises a cover closing bracket 71, a cover closing cylinder 72, a cover closing push plate 73 and a cover closing guide plate 74. The cover closing bracket 71 is fixedly mounted on the side wall of the first fixing plate 10 by screws. One end of the cover closing bracket 71 is provided with a cylinder fixing plate 75, which is hinged to the cover closing bracket 71 and can rotate in situ on the cover closing bracket 71; the cover closing cylinder 72 is mounted on one side of the cylinder fixing plate 75, and the piston of the cover closing cylinder 72 passes through the cylinder fixing plate 75 and is fixedly connected to the cover closing push plate 73; the cylinder fixing plate 75 is provided with A linear bearing 76 is provided with a closing guide rod 77, one end of which is fixedly connected to the closing push plate 73, and the other end of which is fixedly connected to the closing guide plate 74; limiting columns are provided at both ends of the closing guide plate 74, and guide grooves 78 are provided on the inner walls of both sides of the closing bracket 71, and the limiting columns are inserted into the guide grooves 78; a closing push rod 79 is provided on the side of the closing push plate 73 far from the closing guide rod 77, and a closing wheel 710 is provided at the end of the closing push rod 79, and the closing wheel 710 is rotatably limitedly connected to the closing push rod 79.

[0061] When the injection mold is performing the cover closing operation, the cover closing cylinder 72 drives the cover closing push plate 73 to move, and the cover closing push plate 73 drives the cover closing guide rod 77 and the cover closing guide plate 74 to move, so that the limit column slides in the guide groove 78. Affected by the shape of the guide groove 78, the cylinder fixing plate 75 will rotate, thereby changing the direction of the cover closing wheel 710 to complete the cover closing action. Among them, during the movement of the cover closing guide plate 74, the cover closing wheel 710 is first controlled to move upward, at which time the cover closing wheel 710 pushes the top cover of the plastic product to flip up; then the cover closing guide plate 74 controls the cover closing wheel 710 to move downward, at which time the cover closing wheel 710 pushes the top cover of the plastic product to press down, completing the cover closing action. After the cover closing is completed, the cover closing cylinder 72 resets and drives the cover closing mechanism 7 to reset.

[0062] In this embodiment, the shape of the guide groove 78 can be divided into three sections, first parallel to the horizontal direction, then downward, and finally upward. During the sliding process of the limit column in the guide groove 78, the corresponding working stroke of the cover closing mechanism 7 is: when the limit column is located in the section parallel to the horizontal direction, the cover closing cylinder 72 drives the cover closing wheel 710 to extend, and at this time the cover closing wheel 710 has not yet contacted the plastic product; when the limit column moves to the downward section relative to the horizontal direction, the cover closing wheel 710 contacts the top cover of the plastic product and pushes the top cover to flip up; when the limit column moves to the upward section relative to the horizontal direction, the cover closing wheel 710 pushes the top cover of the plastic product downward to complete the cover closing action.

[0063] The working process of this injection mold is as follows:

[0064] First, the injection mold is installed on an injection molding machine, and an ejection mechanism is provided on the injection molding machine to push the first ejector plate 12 to move.

[0065] The injection molding machine controls the fixed mold and the movable mold to close, injects rubber into the product cavity 1, and performs injection molding of the plastic product.

[0066] After the injection molding is completed, the injection molding machine controls the injection mold to open the fixed mold and the movable mold to start demoulding the plastic product. The demoulding of the plastic product includes the following processes:

[0067] 1. Dethreading: During the process of controlling the mold opening, the injection molding machine drives the driving rod 51 to move. The driving rod 51 drives the first gear 53 to rotate, and the second gear 54, the third gear 55 and the fourth gear 56 are driven to rotate synchronously through the first gear 53; the third gear 55 drives the transmission shaft 52 to rotate, and the transmission shaft 52 rotates through the threaded connection with the second fixed plate 9, driving the second fixed plate 9 to move away from the first fixed plate 10, so that the product cavity 1 moves with the plastic product away from the threaded core 4; during the movement of the second fixed plate 9, the fourth gear 56 rotates to drive the threaded core 4 to rotate synchronously, and the threaded core 4 will rotate and disengage from the threaded part of the plastic product, thereby completing the dethreading of the plastic product.

[0068] 2. Pre-ejection: The ejection oil cylinder 61 drives the piston rod 65 to move, and the piston rod 65 drives the connecting block 62 to move through the limit block 66. The connecting block 62 drives the first ejector plate 12 and the push rod 63 to move. The push rod 63 pushes the second ejector plate 11 to move through the bayonet 64. The ejector 2 and the ejector sleeve 3 extend out of the surface of the second fixed plate 10, and the plastic product is pushed out of the product cavity 1, so that the cover mechanism 7 can cover the plastic product. During the driving process of the ejection oil cylinder 61, the push rod 63 slides in the limit groove 141 of the cover plate 14. When the bayonet 64 moves to the position corresponding to the receiving groove 142, the push rod 63 will push the bayonet 64 into the receiving groove 142, so that the bayonet 64 is separated from the push rod 63, that is, the second ejector plate 12 is separated from the first ejector plate 11.

[0069] 3. Closing the cover: the closing cylinder 72 drives the closing push plate 73 to move, and the closing push plate 73 drives the closing guide rod 77 and the closing guide plate 74 to move, so that the limit column slides in the guide groove 78. Affected by the shape of the guide groove 78, the cylinder fixing plate 75 rotates, thereby changing the direction of the closing wheel 710 to complete the closing action.

[0070] 4. Product demoulding. After the plastic product is covered, the ejector mechanism of the injection molding machine starts to work, pushing the first ejector plate 11 to move. At this time, the latch 64 is disengaged from the push rod 63, so the second ejector plate 11 will not move with the first ejector plate 12. The first ejector plate 12 pushes the ejector 2 to extend out of the ejector sleeve 3, so that the plastic product is separated from the ejector sleeve 3, and the plastic product is demoulded.

[0071] The injection mold can be applied to ordinary injection molding machines. It can complete the injection molding, thread removal, cap closing and ejection of plastic products in conjunction with the original ejection mechanism of the injection molding machine. There is no need to modify or purchase an additional injection molding machine, which can greatly reduce the investment cost of the enterprise and the work intensity of the operators.

[0072] It should be noted that the injection mold in the present embodiment has a structure for molding eight products at one time. Obviously, in other embodiments, the injection mold can also mold any other number of products at one time. It is only necessary to make corresponding adjustments to the number of the corresponding dethreading mechanism 5, the first ejection mechanism 6, the cover closing mechanism 7 and the second ejection mechanism.

[0073] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. An injection mold for in-mold closing, comprising a movable mold, wherein the upper surface of the movable mold is provided with a product cavity, characterized in that: An ejector is provided in the movable mold, an ejector sleeve is provided on the outer side of the ejector, a threaded core is provided on the outer side of the ejector sleeve, one end of the ejector, the ejector sleeve and the threaded core are respectively connected to the movable mold, and the other ends of the ejector, the ejector sleeve and the threaded core are respectively extended into the product cavity; The movable mold is provided with a thread stripping mechanism, a first ejection mechanism, a cover closing mechanism and a second ejection mechanism; The thread removal mechanism is connected to the thread core and is used to drive the thread core to separate from the product cavity; The first ejection mechanism is connected to the ejector pin and the ejector sleeve respectively, and is used to eject the plastic product from the product cavity; The cover closing mechanism is connected to the movable mold and is used to close the cover of the plastic product; The second ejection mechanism is connected to the ejector pin and is used to drive the ejector pin to extend out of the ejector pin sleeve to drive the plastic product to separate from the ejector pin sleeve. The movable mold is provided with a first fixing plate and a second fixing plate, the second fixing plate is arranged above the first fixing plate, the first fixing plate is connected to the threaded core, the other end of the threaded core passes through the second fixing plate and extends into the product cavity, and the product cavity is arranged on the upper surface of the second fixing plate. The thread stripping mechanism comprises a driving rod, one end of which is connected to the first fixed plate, and the other end of which extends out of the upper surface of the movable mold. A transmission shaft is provided on the first fixed plate, and one end of the transmission shaft away from the first fixed plate is adjustable and threadedly connected to the second fixed plate. The driving rod can drive the thread core and the transmission shaft to rotate synchronously. The driving rod drives the transmission shaft to rotate, thereby driving the second fixing plate to move in a direction away from the first fixing plate.

2. The in-mold lid-closing injection mold according to claim 1, characterized in that: The driving rod is provided with a first gear, the first fixing plate is provided with a plurality of second gears, and the first gear is meshedly connected with the second gears; The transmission shaft is provided with a third gear, and the third gear is meshed and connected with the second gear; The threaded core is provided with a fourth gear, and the fourth gear is meshedly connected with the second gear.

3. The in-mold lid-closing injection mold according to any one of claims 1 or 2, characterized in that: A second ejector plate and a first ejector plate are sequentially provided below the first fixed plate, one end of the ejector is connected to the first ejector plate, the ejector sequentially passes through the second ejector plate, the first fixed plate and the second fixed plate, one end of the ejector away from the first ejector plate can extend into the product cavity, one end of the ejector sleeve is connected to the second ejector plate, the ejector sleeve sequentially passes through the first fixed plate and the second fixed plate, and one end of the ejector sleeve away from the second ejector plate can extend into the product cavity.

4. The in-mold lid-closing injection mold according to claim 3, characterized in that: The first ejection mechanism comprises an ejection oil cylinder, the ejection oil cylinder is connected to the first fixing plate, the first ejector plate is provided with a connecting block, the connecting block is connected to the ejection oil cylinder; The first ejector plate is provided with a push rod, and the second ejector plate is provided with a latch pin, the latch pin is detachably latched with the push rod, and the push rod can drive the second ejector plate to move.

5. The in-mold lid-closing injection mold according to claim 4, characterized in that: A piston rod is arranged in the ejection oil cylinder, the piston rod passes through the connection block, and the piston rod and the connection block are in clearance fit; A limiting block is provided at one end of the piston rod extending out of the connecting block, and the limiting block can abut against the lower surface of the connecting block.

6. The in-mold lid-closing injection mold according to claim 4, characterized in that: A third fixing plate is provided below the second ejector plate, the third fixing plate is connected to the first fixing plate, the second ejection mechanism comprises a cover plate provided on the side wall of the third fixing plate, the cover plate is sleeved on the outside of the push rod and the bayonet; The second ejector plate is provided with a mounting block, the bayonet is slidably limitedly connected to the mounting block, the push rod is provided with a slot, the bayonet can be inserted into the slot, the inner side wall of the cover plate is provided with a receiving slot adapted to the bayonet, and the push rod can squeeze the bayonet into the receiving slot; A first elastic member is disposed in the mounting block, the first elastic member is connected to the bayonet pin, and the first elastic member is used to push the bayonet pin into the slot.

7. The in-mold lid-closing injection mold according to any one of claims 4 to 6, characterized in that: An ejector reset mechanism is provided in the movable mold, and the ejector reset mechanism includes a first reset guide rod and a second reset guide rod, one end of the first reset guide rod is connected to the first ejector plate, and the other end of the first reset guide rod passes through the second ejector plate, the first fixed plate and the second fixed plate in sequence, one end of the second reset guide rod is connected to the second ejector plate, and the other end of the second reset guide rod passes through the first fixed plate and the second fixed plate in sequence; A second elastic member is sleeved on the outer side of the first reset guide rod. The second elastic member passes through the second ejector plate and the first fixed plate in sequence. One end of the second elastic member is connected to the first ejector plate, and the other end of the second elastic member is connected to the second fixed plate.

8. A demoulding method for the injection mold for the in-mold cover according to any one of claims 4 to 7, the demoulding method is performed by an injection molding machine, and an ejection mechanism is provided on the injection molding machine, characterized in that: The demoulding method comprises the following steps: To remove threads, when the mold is opened, the injection molding machine drives the driving rod to move, and the driving rod drives the thread core and the transmission shaft to rotate synchronously. The transmission shaft rotates to drive the second fixed plate to move away from the first fixed plate, thus completing the thread removal of the plastic product. Pre-ejection: the ejection cylinder drives the first ejector plate to move, and the first ejector plate moves with the push rod, and the push rod pushes the second ejector plate to move through the bayonet pin, and the ejector and the ejector sleeve extend out of the surface of the second fixed plate to push the product out of the product cavity; Closing the cover: the closing mechanism works to close the cover on the product; The product is demoulded, and the ejection mechanism of the injection molding machine pushes the first ejector plate, and the first ejector plate drives the push rod to disengage from the latch, so that the second ejector plate is separated from the first ejector plate, and the first ejector plate drives the ejector to extend out of the ejector sleeve, so that the product is separated from the ejector sleeve.

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