A multi-parting mold opening structure pull ring cover injection mold

Abstract

The invention discloses an injection mold for a pull-ring cover with a multiple-parting mold opening structure, comprising a movable mold component, a fixed mold component and a demoulding device for controlling the opening sequence of the injection mold, wherein the movable mold component and the fixed mold component are installed in a relatively matched manner, and the demoulding device is installed on one side of the movable mold component and the fixed mold component, wherein the movable mold component is installed on an injection molding machine through a movable template, and the fixed mold component is installed on a fixed template of the injection molding machine; an opener, an ejector component and a limiter component are arranged in the demoulding component, so that when the injection mold is opened, the movable mold component is moved to drive the opener and the ejector component to move, thereby realizing sequential linkage parting between the templates in the fixed mold component, and the templates in the movable mold component are also parted in sequence under the action of the ejector component, and the fixed mold component and the movable mold component are parted and moved and limited by the limiter component during the parting process, thereby realizing the function of orderly opening the fixed mold four times and ejecting the movable mold twice, thereby improving the reliability of the injection mold opening.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds, and in particular relates to an injection mold for a pull-ring cover with a multiple-parting mold opening structure. Background Art

[0002] Ring pull caps are widely used in containers such as oil bottles and soy sauce bottles. Figure 9 As shown, the ring-pull cap has an upper body portion and a lower body portion. The upper body portion is sealed with the upper cap, while the lower body portion is connected to the sealed container. The upper body portion includes external threads 61, a flow guide port 62, and a pull ring 63 structure, while the lower body portion includes an inner buckle 64 connected to the container opening, an inner plug 65, and a baffle 66 structure. These molding structures have radial protrusions. When the ring-pull cap is injection molded, the radial protrusions hinder the ejection of the ring-pull cap, resulting in the ring-pull cap being unable to be removed or the ejection of the ring-pull cap damaging the integrity of the ring-pull cap.

[0003] In order to solve the demoulding problem after the pull ring cap is injected into the mold, a method for designing the injection mold into a multiple-parting mold opening structure has appeared on the market. For example, the Chinese invention patent application document with the patent application number 201811306030.X discloses a forced demoulding multiple-parting bottle cap injection mold, comprising a mold cavity, a pouring system, a plastic part below the pouring system, a third core insert inserted in the first hole, a fourth cavity insert arranged in the first annular groove, a first cavity insert arranged at the outer circumferential surface of the plastic part with an external thread, a second cavity insert arranged at the smooth outer circumferential surface of the plastic part, a first core insert arranged at the first internal thread, a second core insert inserted in the second hole, and a third core insert arranged on the end surface of the plastic part away from the pouring system. The injection mold is demoulded by multiple parting, so that the injection molded product can be demoulded. However, the injection mold adopts a forced demoulding method to demould the product, which may cause damage to the product.

[0004] Another multiple-parting mold opening structure, such as the Chinese invention patent document with patent application number 201811306090.1, discloses a composite bottle cap injection mold with four upper mold openings and two lower mold openings, including a positioning ring, a gate sleeve, a panel, a runner plate, a first plate, a second plate, a third plate, an upper mold core, a lower mold core, a movable template, a mold foot, a bottom plate, a primary ejector plate, a secondary push plate bottom plate, a secondary push plate cover plate, a first fixed distance sequence opener and closer, a second fixed distance sequence opener and closer, a third fixed distance sequence opener and closer, a limiting rod, a middle support, a small pull rod, a first fixed distance pull rod, a second fixed distance pull rod, a reset spring, a pull rod sleeve, a pull rod, a runner insert, a first ring insert, a first ring insert, a second ring insert, a first ... The second circular insert, the third circular insert, the outer core insert, the middle core insert, the inner core insert, the ejector plate, the ejector plate guide sleeve, the first reset rod, the second reset rod, the third reset rod, the mold frame guide post, the runner plate guide sleeve, the first plate guide sleeve, the second plate guide sleeve, the third plate guide sleeve, and the movable plate guide sleeve. During operation, the runner plate and the first plate are separated, the panel and the runner plate are separated, the first plate and the second plate are separated, the second plate and the third plate are separated, and the third plate and the movable plate are separated, forcing the bottle cap to be demolded three times. The movable plate moves downward, and the first ejection plate, the secondary push plate bottom plate, and the secondary push plate cover plate are ejected for the first time, and the secondary push plate bottom plate and the secondary push plate cover plate are ejected for the second time. The shutters of this structure do not have a linkage effect and operate independently of each other. This can cause problems such as disordered mold opening order when the templates are separated, affecting mold opening.

[0005] In view of the above problems, it is necessary to carry out technical improvements on the existing pull ring cover injection mold. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides an injection mold for a pull-ring cover with a multiple-parting mold opening structure.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A multi-parting mold opening structure pull ring cap injection mold, comprising a movable mold assembly, a fixed mold assembly, and a demoulding device for controlling the mold opening sequence of the injection mold, wherein the movable mold assembly and the fixed mold assembly are relatively mounted in a cooperative manner, and the demoulding device is mounted on one side of the movable mold assembly and the fixed mold assembly, wherein the movable mold assembly is mounted on an injection molding machine via a movable mold plate, and the fixed mold assembly is mounted on a fixed mold plate of the injection molding machine;

[0009] The movable mold assembly includes a push plate, a core plate, an inner mold core fixing plate and a movable mold plate stacked in sequence from top to bottom, and a lower mold forming assembly is also provided in the movable mold assembly;

[0010] The lower mold forming assembly includes a central ejector pin, an inner mold core, a mold core and a push sleeve which are sleeved one by one from the inside to the outside, one end of the central ejector pin is mounted on the movable template through an elastic reset mechanism, the other end of the central ejector pin cooperates with the inner mold core, the central ejector pin can move axially relative to the inner mold core, the inner mold core is fixedly mounted relative to the inner mold core fixing plate, the inner mold core fixing plate is mounted on the movable template, the mold core is fixedly mounted relative to the mold core plate, the mold core can move axially relative to the inner mold core, the push sleeve is fixedly mounted relative to the push plate, and the push plate is connected to a first ejection mechanism for driving the push plate to eject the pull-ring cover product out of the mold;

[0011] The fixed mold assembly includes a nozzle core fixing plate, a pull ring core fixing plate, a mother mold core fixing plate and a cavity plate which are stacked in sequence from top to bottom, and an upper mold forming assembly is also provided in the fixed mold assembly;

[0012] The upper mold forming assembly includes a nozzle core, a water transport bushing, a pull ring core, a mother mold core, and a mold cavity that are sleeved one by one from the inside to the outside, the nozzle core is installed in the nozzle core fixing plate through the water transport bushing, the pull ring core is fixedly installed relative to the pull ring core fixing plate, the pull ring core can move axially relative to the water transport bushing and / or the nozzle core, the mother mold core is fixedly installed relative to the mother mold core fixing plate, the mother mold core can move axially relative to the pull ring core, the mold cavity is fixedly installed relative to the mold cavity plate, and the mold cavity can move axially relative to the mother mold core;

[0013] The lower mold forming assembly and the upper mold forming assembly are combined to form a pull ring cover injection molding cavity;

[0014] The demoulding device includes an opener and a closeer for controlling the parting between the templates in the fixed mold assembly, an ejection assembly for controlling the parting between the templates in the movable mold assembly, and a limiting assembly for controlling the parting spacing between the templates in the injection mold.

[0015] As a further improvement of the present invention, the opener and closer includes a lock buckle installed on the side of the movable mold assembly, a release plate installed on the side of the nozzle core fixing plate, a first lock tongue installed on the side of the pull ring core fixing plate, a second lock tongue installed on the side of the mother mold core fixing plate, and a third lock tongue installed on the side of the cavity plate. The first lock tongue, the second lock tongue and the third lock tongue are all elastic telescopic structures. The lock buckle is provided with three locking positions respectively cooperating with the first lock tongue, the second lock tongue and the third lock tongue. The release plate is provided with three extended positions and three retracted positions respectively cooperating with the first lock tongue, the second lock tongue and the third lock tongue to achieve telescopic expansion. The three extended positions and the three retracted positions are respectively arranged alternately and continuously. The difference in vertical length between adjacent extended positions is equivalent to the parting distance of the previous template. The first lock tongue, the second lock tongue and the third lock tongue are all provided with a front locking end cooperating with the lock buckle and a rear control end cooperating with the release plate to control telescopic expansion.

[0016] As a further improvement of the present invention, the ejection assembly includes a second ejection mechanism for pushing the core plate and the inner core fixed plate to separate and combine, the second ejection mechanism is fixedly installed in the inner core fixed plate, the telescopic end of the second ejection mechanism is connected to the core plate, the first ejection mechanism is installed in the core plate, and the telescopic end of the first ejection mechanism is connected to the push plate.

[0017] As a further improvement of the present invention, the limiting assembly includes a first limiting pin that connects the nozzle core fixing plate and the pull ring core fixing plate together and has a certain parting distance, a second limiting pin that connects the pull ring core fixing plate and the mother mold core fixing plate together and has a certain parting distance, a third limiting pin that connects the mother mold core fixing plate and the cavity plate together and has a certain parting distance, a fourth limiting pin that connects the push plate and the core plate together and has a certain parting distance, and a fifth limiting pin that connects the core plate and the inner mold core fixing plate together and has a certain parting distance.

[0018] As a further improvement of the present invention, a mating end and a nozzle accommodating cavity that cooperate with the hot runner nozzle are opened in the center of the nozzle core. The bottom end face of the nozzle core is the top molding surface of the pull ring cover, and the bottom side surface of the nozzle core is the inner molding surface of the pull ring.

[0019] As a further improvement of the present invention, the outer side wall of the nozzle core is provided with a cooling passage for cooperating with the water transport bushing to form a cooling water circuit for the nozzle core.

[0020] As a further improvement of the present invention, the nozzle core and the bottom end of the pull ring core are fitted together to form a molding cavity for the pull ring part of the pull ring cover, the pull ring core and the bottom end of the mother mold core are fitted together to form a molding cavity for the guide port part of the pull ring cover, the mother mold core and the mold cavity are fitted together to form a molding cavity for the external thread part of the pull ring cover, the mold cavity and the mold core are fitted together to form a molding cavity for the inner buckle part of the pull ring cover, the mold core and the inner mold core are fitted together to form a molding cavity for the inner plug part of the pull ring cover, and the inner mold core and the center push rod are fitted together to form a molding cavity for the baffle part of the pull ring cover.

[0021] As a further improvement of the present invention, a pull ring cooling water groove is provided on the outer side wall of the upper end of the pull ring core.

[0022] As a further improvement of the present invention, the lower ends of the pull ring core and the female mold core adopt a conical matching alignment structure.

[0023] As a further improvement of the present invention, a conical matching alignment structure is adopted between the mother mold core and the mold cavity, and a mold cavity cooling water groove is opened on the outer wall of the mold cavity.

[0024] The beneficial effects of the present invention are as follows: the present invention arranges a nozzle core fixing plate, a pull ring core fixing plate, a mother mold core fixing plate and a cavity plate in the fixed mold assembly, and arranges a push plate, a mold core plate and an inner mold core fixing plate in the movable mold assembly, and arranges an opener, an ejection assembly and a limit assembly in the demoulding assembly, so that when the injection mold is opened, the opener is driven by the movement of the movable mold assembly to move, thereby realizing the sequential linkage parting between the templates in the fixed mold assembly, and the templates in the movable mold assembly are also parted in sequence under the action of the ejection assembly, and the fixed mold assembly and the movable mold assembly are limited in the parting process. The positioning assembly is used to limit the parting movement, thereby realizing the functions of orderly opening the fixed mold four times and ejecting the movable mold twice, thereby improving the reliability of the injection mold opening; at the same time, by arranging a pull ring core and a mother mold core in the fixed mold assembly and both being able to move axially, it is effectively avoided that the pull ring part and the guide port part are forced to be removed to cause damage to the product, thereby ensuring the integrity of the product demoulding; in addition, the present invention provides an elastic reset mechanism at the bottom end of the central ejector rod, so that the central ejector rod is reset after demoulding to form a molding cavity with the mold core, preparing for the next injection molding cycle, thereby ensuring that the central ejector rod is accurately and quickly reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below with reference to the accompanying drawings and embodiments:

[0026] Figure 1 This is a schematic diagram of the installation structure of the injection mold of this embodiment;

[0027] Figure 2 This is a schematic diagram of the installation structure of the demoulding device of this embodiment;

[0028] Figure 3 This is a schematic structural diagram of the injection mold of this embodiment in the mold opening state;

[0029] Figure 4 This is a schematic structural diagram of the demoulding device of this embodiment in the mold opening state;

[0030] Figure 5 This is a schematic structural diagram of the upper mold forming assembly and the lower mold forming assembly in the mold closing state of this embodiment;

[0031] Figure 6 Schematic diagram of the structure of the trip plate of this embodiment;

[0032] Figure 7 This is a schematic structural diagram of the lock tongue of this embodiment;

[0033] Figure 8 Schematic diagram of the structure of the nozzle core of this embodiment;

[0034] Figure 9 Schematic diagram of the structure of the pull ring cover of this embodiment. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] Example:

[0037] like Figures 1 to 8As shown, this embodiment discloses a multi-parting mold opening structure pull ring cover injection mold, including a movable mold assembly 1, a fixed mold assembly 2 and a demoulding device for controlling the mold opening order of the injection mold, the movable mold assembly 1 and the fixed mold assembly 2 are relatively matched and installed, and the demoulding device is installed on one side of the movable mold assembly 1 and the fixed mold assembly 2, wherein the movable mold assembly 1 is installed on the injection molding machine through the movable template 4, and the fixed mold assembly 2 is installed on the fixed template of the injection molding machine; the movable mold assembly 1 includes a push plate 11, a core plate 12, an inner mold core fixed plate 13 and a movable template 4 stacked in sequence from top to bottom, and a lower mold forming assembly is also provided in the movable mold assembly 1 Part 14; The lower mold forming assembly 14 includes a center push rod 141, an inner mold core 142, a mold core 143, and a push sleeve 144, which are connected one by one from the inside to the outside. One end of the center push rod 141 is mounted on the movable template 4 via an elastic reset mechanism 15, and the other end of the center push rod 141 cooperates with the inner mold core 142. The center push rod 141 can move axially relative to the inner mold core 142. By providing an elastic reset mechanism 15 at the bottom end of the center push rod 141, the main function of the elastic reset mechanism 15 is to reset the center push rod 141 after demolding so that it forms a molding cavity with the mold core 143, preparing for the next injection molding cycle. Since the baffle is formed at the top conical portion of the center push rod 141, when the push sleeve 144 pushes the bottle cap out, the baffle drives the center push rod 141 to move up a certain distance so that the baffle can be separated from the center push rod 141. However, without the elastic reset mechanism 15, it is impossible to ensure that the center push rod 141 is accurately and quickly reset.The inner mold core 142 is relatively fixedly installed with the inner mold core fixing plate 13, the inner mold core fixing plate 13 is installed on the movable template 4, the mold core 143 is relatively fixedly installed with the mold core plate 12, the mold core 143 can be axially moved relative to the inner mold core 142, the push sleeve 144 is relatively fixedly installed with the push plate 11, and the push plate 11 is connected with a first ejection mechanism for driving the push plate 11 to eject the pull ring cover product from the demoulding; the fixed mold assembly 2 includes a plurality of molds from top to bottom according to the embodiment of the present invention; The nozzle core fixing plate 21, the pull ring core fixing plate 22, the mother mold core fixing plate 23 and the cavity plate 24 are stacked one by one. The fixed mold assembly 2 is also provided with an upper mold forming assembly 25; the upper mold forming assembly 25 includes a nozzle core 251, a water transport bushing 252, a pull ring core 253, a mother mold core 254 and a cavity 255 that are sleeved one by one from the inside to the outside. The nozzle core 251 is installed in the nozzle core fixing plate 21 through the water transport bushing 252. The pull ring core 253 is fixedly installed relative to the pull ring core fixing plate 22, and the pull ring core 253 can move axially relative to the water transport bushing 252 and / or the nozzle core 251. The mother mold core 254 is fixedly installed relative to the mother mold core fixing plate 23, and the mother mold core 254 can move axially relative to the pull ring core 253, effectively avoiding damage to the product caused by forced removal of the pull ring part and the guide port part, and ensuring the integrity of the product demolding; the mold cavity 255 is fixedly installed relative to the mold cavity plate 24, and the mold cavity 255 can move axially relative to the mother mold core 254; the lower mold molding assembly 14 and the upper mold molding assembly 25 are combined to form a pull ring cover injection molding cavity; the demolding device includes an opener and shutter 31 for controlling the parting between the templates in the fixed mold assembly 2, an ejector assembly for controlling the parting between the templates in the movable mold assembly 1, and a limit assembly for controlling the parting distance between the templates in the injection mold. By arranging a nozzle core fixing plate 21, a pull ring core fixing plate 22, a mother mold core fixing plate 23 and a cavity plate 24 in the fixed mold assembly 2, and arranging a push plate 11, a core plate 12 and an inner mold core fixing plate 13 in the movable mold assembly 1, and arranging an opener and shutter 31, an ejection assembly and a limit assembly in the demoulding assembly, when the injection mold is opened, the movable mold assembly 1 moves to drive the opener and shutter 31 to move, thereby realizing the sequential linkage parting between the templates in the fixed mold assembly 2, and the templates in the movable mold assembly 1 are also parted in sequence under the action of the ejection assembly. The fixed mold assembly 2 and the movable mold assembly 1 are moved and limited by the limit assembly during the parting process, thereby realizing the function of orderly opening the fixed mold four times and ejecting the movable mold twice, thereby improving the reliability of the injection mold opening.

[0038] In this embodiment, the shutter 31 includes a lock 311 installed on the side of the movable mold assembly 1, a release plate 312 installed on the side of the nozzle core 251 fixing plate, a first lock tongue 313 installed on the side of the pull ring core fixing plate 22, a second lock tongue 314 installed on the side of the mother mold core fixing plate 23, and a third lock tongue 315 installed on the side of the cavity plate 24. The first lock tongue 313, the second lock tongue 314 and the third lock tongue 315 are all elastic and retractable structures. The lock 311 is provided with three locks that cooperate with the first lock tongue 313, the second lock tongue 314 and the third lock tongue 315 respectively. Position 3111, the trip plate 312 is provided with three extending positions 3121 and three retracting positions 3122 for cooperating with the first lock tongue 313, the second lock tongue 314 and the third lock tongue 315 to achieve telescopic expansion and contraction, the three extending positions 3121 and the three retracting positions 3122 are alternately and continuously arranged, and the difference in vertical length between adjacent extending positions 3121 is equivalent to the parting distance of the previous template, the first lock tongue 313, the second lock tongue 314 and the third lock tongue 315 are all provided with a front locking end 3131 cooperating with the lock buckle 311 and a rear control end 3132 cooperating with the trip plate 312 to control telescopic expansion and contraction. In order to facilitate the installation of the first locking tongue 313, the second locking tongue 314 and the third locking tongue 315, a first locking plate 316, a second locking plate 317 and a third locking plate 318 are respectively arranged between the first locking tongue 313 and the pull ring core fixing plate 22, between the second locking tongue 314 and the mother model core fixing plate 23, and between the third locking tongue 315 and the cavity plate 24, that is, the first locking tongue 313, the second locking tongue 314 and the third locking tongue 315 are respectively installed on the side of the pull ring core fixing plate 22, the mother model core fixing plate 23 and the cavity plate 24 through the first locking plate 316, the second locking plate 317 and the third locking plate 318, and springs are arranged at the rear ends of the first locking tongue 313, the second locking tongue 314 and the third locking tongue 315 to realize elastic expansion and contraction.When the mold is opened, the movable mold assembly 1 is driven by the movable mold plate 4 to move in the direction away from the fixed mold assembly 2. When the mold is opened, the lock 311 and the first lock tongue 313, the second lock tongue 314 and the third lock tongue 315 are all in a locked state. The lock 311 drives the nozzle core fixing plate 21 and the pull ring core fixing plate 22 to separate to form a first parting surface. After the nozzle core fixing plate 21 and the pull ring core fixing plate 22 are completely parted, the rear control end 3132 of the first lock tongue 313 is buckled on the first retracted position 3122 of the release plate 312, thereby pushing the first lock tongue 313 to the retracted state. The first lock tongue 313 and the lock 311 are in a disengaged state. The lock 311 continues to move, and the nozzle core fixing plate 21 does not move accordingly and is in a stationary state. When the cam 314 is in the closed position, the second stop 3122 of the second stop 314 is engaged with the stop 316, and the stop 317 is in the closed position, the stop 316 is in the open position, and the stop 317 is in the closed position, the stop 316 is in the closed position, and the stop 317 is in the open position, the stop 316 is in the closed position, and the stop 317 is in the closed position, the stop 317 is in the closed position, and the stop 317 is in the closed position

[0039] In this embodiment, the ejection assembly includes a second ejection mechanism 32 for promoting the separation and combination between the core plate 12 and the inner core fixed plate 13. The second ejection mechanism 32 is fixedly installed in the inner core fixed plate 13, and the telescopic end of the second ejection mechanism 32 is connected to the core plate 12. The first ejection mechanism is installed in the core plate 12, and the telescopic end of the first ejection mechanism is connected to the push plate 11. After the movable mold assembly 1 and the fixed mold assembly 2 are completely separated, the second ejection mechanism 32 extends to lift the core plate 12 and separate it from the inner core fixed plate 13 to form a first ejection surface. Then, the first ejection mechanism extends to lift the push plate 11 and separate it from the core plate 12 to form a second ejection surface. When the push plate 11 is lifted, it drives the push sleeve 144 to eject the injection molded product to complete demolding.

[0040] In this embodiment, the limiting assembly includes a first limiting pin 331 connecting the nozzle core fixing plate 21 and the pull ring core fixing plate 22 with a certain parting distance; a second limiting pin 332 connecting the pull ring core fixing plate 22 and the core mold fixing plate 23 with a certain parting distance; a third limiting pin 333 connecting the core mold fixing plate 23 and the cavity plate 24 with a certain parting distance; a fourth limiting pin 334 connecting the push plate 11 and the core plate 12 with a certain parting distance; and a fifth limiting pin 335 connecting the core plate 12 and the inner mold core fixing plate 13 with a certain parting distance. The parting distance between each template determines the spacing between templates during parting. The corresponding parting distance is equivalent to the vertical distance difference between adjacent retracted positions 3122 of the release plate 312. This enables the templates in the fixed mold assembly 2 to achieve a coordinated parting action through the shutter 31, effectively controlling the order of mold opening and parting.

[0041] In this embodiment, the nozzle core 251 has a centrally located mating end 2511 for the hot runner nozzle and a nozzle accommodating cavity 2512. The bottom end surface of the nozzle core 251 serves as the top molding surface 2513 of the pull ring cap, and the bottom side surface of the nozzle core 251 serves as the inner molding surface 2514 of the pull ring. To improve the cooling efficiency of the nozzle core 251, a cooling passage 2515 is defined on the outer wall of the nozzle core 251, which cooperates with the water-carrying bushing 252 to form a cooling water circuit for the nozzle core 251. This also improves the quality of the molded product and the molding cycle, facilitates part processing, and facilitates cleaning of the cooling passage 2515. The nozzle core 251 and the bottom end of the ring pull core 253 fit together to form the molding cavity for the ring pull portion of the ring pull cover. The ring pull core 253 and the bottom end of the mother mold core 254 fit together to form the molding cavity for the guide port portion of the ring pull cover. The mother mold core 254 fits together with the mold cavity 255 to form the molding cavity for the external thread portion of the ring pull cover. The mold cavity 255 fits together with the mold core 143 to form the molding cavity for the inner buckle portion of the ring pull cover. The mold core 143 fits together with the inner mold core 142 to form the molding cavity for the inner plug portion of the ring pull cover. The inner mold core 142 fits together with the center push rod 141 to form the molding cavity for the baffle portion of the ring pull cover. A ring pull cooling water groove 2531 is provided on the outer side wall of the upper end of the ring pull core 253. To facilitate alignment during mold closing, the lower ends of the ring pull core 253 and the mother mold core 254 adopt a tapered matching alignment structure. The mother mold core 254 and the mold cavity 255 have a tapered alignment structure. The outer wall of the mold cavity 255 is provided with a mold cavity cooling water groove 2551. In addition, the outer walls of the mold core 142 and the inner mold core 143 are provided with a mold core cooling water groove 1421 and an inner mold core cooling water groove 1431, respectively. By providing cooling structures in multiple locations, the present invention can quickly cool the molded product, thereby reducing the injection cycle and improving production efficiency.

[0042] In this embodiment, to ensure the installation stability between the upper mold forming assembly 25 and the fixed mold assembly 2, and between the lower mold forming assembly 14 and the fixed mold assembly 2, a locking screw 5 is provided between each part in the upper mold forming assembly 25 and the corresponding mounting template in the fixed mold assembly 2 for locking. In addition, the outer wall of the top of the part of the upper mold forming assembly 25 is provided with an outer edge that is sunk into the template of the fixed mold assembly 2, and a groove is provided in the corresponding portion of the template of the fixed mold assembly 2 to sink into the outer edge. After the outer edge is sunk into the groove and fitted, it is locked with the locking screw 5. Similarly, the part mounting structure in the lower mold forming assembly 14 also adopts the same locking structure, thereby effectively preventing loosening between the forming assembly and the template during the mold opening and closing process, ensuring that the production of the next injection molded product can continue.

[0043] The above descriptions are merely preferred embodiments of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the scope of protection of the present invention.

Claims

1. A multiple-parting mold opening structure pull ring cover injection mold, comprising a movable mold assembly, a fixed mold assembly and a demoulding device for controlling the mold opening sequence of the injection mold, wherein the movable mold assembly and the fixed mold assembly are relatively matched and installed, and the demoulding device is installed on one side of the movable mold assembly and the fixed mold assembly, wherein the movable mold assembly is installed on an injection molding machine through a movable template, and the fixed mold assembly is installed on a fixed template of the injection molding machine, characterized in that: The movable mold assembly comprises a push plate, a mold core plate, an inner mold core fixing plate and a movable mold plate which are stacked in sequence from top to bottom, and a lower mold forming assembly is also provided in the movable mold assembly; The lower mold forming assembly includes a central ejector rod, an inner mold core, a mold core and a push sleeve which are sleeved one by one from the inside to the outside, one end of the central ejector rod is installed on the movable mold plate through an elastic reset mechanism, the other end of the central ejector rod cooperates with the inner mold core, the central ejector rod can move axially relative to the inner mold core, the inner mold core is relatively fixedly installed with an inner mold core fixing plate, the inner mold core fixing plate is installed on the movable mold plate, the mold core is relatively fixedly installed with the mold core plate, the mold core can move axially relative to the inner mold core, the push sleeve is relatively fixedly installed with a push plate, and the push plate is connected with a first ejection mechanism for driving the push plate to eject the pull ring cover product out of the mold; The fixed mold assembly comprises a nozzle core fixing plate, a pull ring core fixing plate, a mother mold core fixing plate and a cavity plate which are stacked in sequence from top to bottom, and an upper mold forming assembly is also provided in the fixed mold assembly; The upper mold forming assembly comprises a nozzle core, a water transport bushing, a pull ring core, a mother mold core and a mold cavity which are sleeved one by one from the inside to the outside, the nozzle core is installed in the nozzle core fixing plate through the water transport bushing, the pull ring core is fixedly installed relative to the pull ring core fixing plate, the pull ring core can move axially relative to the water transport bushing and / or the nozzle core, the mother mold core is fixedly installed relative to the mother mold core fixing plate, the mother mold core can move axially relative to the pull ring core, the mold cavity is fixedly installed relative to the mold cavity plate, and the mold cavity can move axially relative to the mother mold core; The lower mold forming component and the upper mold forming component are molded together to form a pull ring cover injection molding cavity; The demoulding device includes an opener and a closeer for controlling the parting between the templates in the fixed mold assembly, an ejector assembly for controlling the parting between the templates in the movable mold assembly, and a limit assembly for controlling the parting spacing between the templates in the injection mold; The shutter comprises a lock mounted on the side of the movable mold assembly, a release plate mounted on the side of the nozzle core fixing plate, a first lock tongue mounted on the side of the pull ring core fixing plate, a second lock tongue mounted on the side of the mother mold core fixing plate, and a third lock tongue mounted on the side of the cavity plate, wherein the first lock tongue, the second lock tongue and the third lock tongue are all elastic telescopic structures, the lock is provided with three locking positions respectively matched with the first lock tongue, the second lock tongue and the third lock tongue, the release plate is provided with three extending positions and three retracting positions respectively matched with the first lock tongue, the second lock tongue and the third lock tongue to achieve telescopic, the three extending positions and the three retracting positions are respectively arranged alternately and continuously, the difference in vertical length between adjacent extending positions is equivalent to the parting distance of the previous template, and the first lock tongue, the second lock tongue and the third lock tongue are all provided with a front locking end matched with the lock and a rear control end matched with the release plate to control telescopic; The ejection assembly includes a second ejection mechanism for pushing the core plate and the inner core fixing plate to separate and combine, the second ejection mechanism is fixedly installed in the inner core fixing plate, the telescopic end of the second ejection mechanism is connected to the core plate, the first ejection mechanism is installed in the core plate, and the telescopic end of the first ejection mechanism is connected to the push plate; The limiting assembly includes a first limiting pin that connects the nozzle core fixing plate and the pull ring core fixing plate together with a certain parting distance, a second limiting pin that connects the pull ring core fixing plate and the mother mold core fixing plate together with a certain parting distance, a third limiting pin that connects the mother mold core fixing plate and the cavity plate together with a certain parting distance, a fourth limiting pin that connects the push plate and the core plate together with a certain parting distance, and a fifth limiting pin that connects the core plate and the inner mold core fixing plate together with a certain parting distance.

2. The multiple-parting mold opening structure pull ring cover injection mold according to claim 1, characterized in that: The center of the nozzle core is provided with a mating end and a nozzle accommodating cavity which match the hot runner nozzle, the bottom end face of the nozzle core is the top molding surface of the pull ring cover, and the bottom side face of the nozzle core is the inner molding surface of the pull ring.

3. The multiple-parting mold opening structure pull ring cover injection mold according to claim 2, characterized in that: The outer side wall of the nozzle core is provided with a cooling passage for cooperating with the water transport bushing to form a cooling water circuit for the nozzle core.

4. The multiple-parting mold opening structure pull ring cover injection mold according to claim 1, characterized in that: The nozzle core and the bottom end of the pull ring core are sleeved together to form a molding cavity for the pull ring part of the pull ring cover, the pull ring core and the bottom end of the mother model core are sleeved together to form a molding cavity for the guide port part of the pull ring cover, the mother model core and the mold cavity are sleeved together to form a molding cavity for the external thread part of the pull ring cover, the mold cavity and the mold core are sleeved together to form a molding cavity for the inner buckle part of the pull ring cover, the mold core and the inner mold core are sleeved together to form a molding cavity for the inner plug part of the pull ring cover, and the inner mold core and the center push rod are sleeved together to form a molding cavity for the flow baffle part of the pull ring cover.

5. The multiple-parting mold opening structure pull ring cover injection mold according to claim 1, characterized in that: The outer side wall of the upper end of the pull ring core is provided with a pull ring cooling water tank.

6. The multiple-parting mold opening structure pull ring cover injection mold according to claim 1, characterized in that: The lower ends of the pull ring core and the female mold core adopt a conical matching alignment structure.

7. The multiple-parting mold opening structure pull ring cover injection mold according to claim 1, characterized in that: A conical matching alignment structure is adopted between the mother mold core and the mold cavity, and a mold cavity cooling water tank is provided on the outer wall of the mold cavity.

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