A bottle cap mold

Abstract

The present invention relates to an injection mold, especially a bottle cap mold, which includes a front plate, a front template, a rear template, a support plate, a bottom plate, a first ejector plate group and a second ejector plate group. A hollow rod is movably inserted through the support plate. The hollow rod is connected with a rotary drive mechanism. A hollow ejector rod is movably inserted through the inner hole of the hollow rod. A core rod is movably inserted through the inner hole of the hollow ejector rod. One end of the core rod is provided with a concave annular groove, and the other end is fixedly connected to the second ejector plate group. A spring is arranged between the second ejector plate group and the bottom plate. The rotary drive mechanism includes a lead screw, a lead nut, a driving gear and a driven gear. The present invention can utilize the mold opening action of the mold to drive the corresponding components to perform the threading action of the internal thread and the hard ejection action of the convex snap ring in sequence, without the need to set up an independent power source, effectively reducing the mold cost.

Description

Technical Field

[0001] The present invention relates to an injection mold, and more particularly to a bottle cap mold. Background Art

[0002] At present, many cosmetic bottle caps are used. Such bottle caps usually include an outer cap and an inner cap integrally connected to the inner cavity of the outer cap, and may even integrally connect a decorative cap to the outside of the outer cap. The outer cap is mainly used to connect with the bottle body, and an inner thread section matching the outer thread section on the bottle mouth is usually provided on its inner side wall. The inner cap is mainly used for sealing, and a convex snap ring is usually provided on its inner side wall to press tightly on the bottle mouth or the liquid outlet pipe to achieve sealing.

[0003] The above-mentioned bottle caps are usually produced by injection molding. In order to avoid the deformation of the threads of the inner thread during mold opening, which results in unqualified products, the threading action of the inner thread and the hard ejection action of the convex snap ring usually need to be carried out separately. Otherwise, the convex snap ring will pull the bottle cap during the ejection process, causing the threads of the inner thread to be turned over and deformed. In order to separate the threading action of the inner thread and the hard ejection action of the convex snap ring during mold opening, usually an independent power source (such as a motor or a cylinder, etc.) needs to be provided on the mold, and one of the threading action of the inner thread and the hard ejection action of the convex snap ring is executed by using this power source, and the other action of the threading action of the inner thread and the hard ejection action of the convex snap ring is executed by using the power provided when the injection molding machine performs the mold opening action, resulting in a relatively high mold cost.

[0004] In view of this, the present application has conducted in-depth research on the structure of the bottle cap mold, and thus this case has been generated. Summary of the Invention

[0005] The purpose of the present invention is to provide a bottle cap mold with relatively low cost.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A bottle cap mold, the bottle cap includes an outer cap and an inner cap integrally connected to the inner cavity of the outer cap. An internal thread section is provided on the inner side wall of the outer cap, and a convex snap ring is provided on the inner side wall of the inner cap. The mold includes a panel, a front template, a rear template, a support plate, and a bottom plate arranged in sequence and parallel to each other. A square iron is fixedly connected between the support plate and the bottom plate. A first ejector plate group and a second ejector plate group located on the side of the first ejector plate group facing the bottom plate are also provided between the support plate and the bottom plate. A mold core is installed on the side of the rear template facing the front template. A cavity penetrating through the front and rear is provided on the mold core. A hollow rod that is also inserted into the cavity is movably inserted through the support plate. An external thread section matching the internal thread section is provided at one end of the hollow rod inserted into the cavity, and the other end is fixedly connected to the second ejector pin group. The hollow rod is connected with a rotary drive mechanism for driving the hollow rod to rotate. A hollow ejector pin rod is movably inserted into the inner hole of the hollow rod. One end of the hollow ejector pin rod is fixedly connected to the first ejector plate group. A core rod is movably inserted into the inner hole of the hollow ejector pin rod. A concave ring groove matching the convex snap ring is provided at one end of the core rod, and the other end is fixedly connected to the second ejector plate group. A spring is directly or indirectly provided between the second ejector plate group and the bottom plate. A relief through hole is provided on the second ejector plate group. The rotary drive mechanism includes a rack screw with one end installed on the front template, a rack nut sleeved on the rack screw, a driving gear fixedly sleeved on the rack nut, and a driven gear directly or indirectly meshing with the driving gear. The end of the rack screw away from the front template is fixedly connected to the bottom plate, the support plate, or the square iron. The driven gear is fixedly sleeved on the hollow rod.

[0008] As an improvement of the present invention, a transition plate is further fixedly connected to the side of the support plate facing the rear template. An installation cavity for placing the driving gear and the driven gear is provided on the transition plate.

[0009] As an improvement of the present invention, a anti-misalignment rod is rotatably connected to the bottom plate. A hook is provided at the end of the anti-misalignment rod away from the bottom plate. A card slot cooperating with the hook is provided on the first ejector plate group. A guiding groove inclined with respect to the anti-misalignment rod is provided on the anti-misalignment rod. A pushing block is slidably connected in the guiding groove. A push rod fixed to the second ejector plate group is connected to the pushing block. In the mold closing state, the hook is inserted into the card slot.

[0010] As an improvement of the present invention, a movable plate is arranged between the front template and the panel, a first pull rod fixedly connected to the panel is slidably inserted on the movable plate, a second pull rod fixedly connected to the movable plate is slidably inserted on the front template, a limiting block is arranged on the end of the first pull rod and the second pull rod away from the panel, a flow channel is opened on the side of the front template facing the movable plate, a through hole arranged corresponding to the flow channel is opened on the movable plate, and a material head hook needle movably inserted in the through hole is fixedly connected to the panel.

[0011] As an improvement of the present invention, a ejector block movably inserted into the yielding hole is fixedly connected to the first ejector plate assembly.

[0012] As an improvement of the present invention, both the first ejector plate group and the second ejector plate group include an ejector panel and an ejector bottom plate fixedly connected to each other.

[0013] As an improvement of the present invention, the mold core includes two sliders respectively slidably connected to the movable mold plate, and grooves are respectively opened on the opposite sides of the two sliders. After the two sliders are fitted together, the two grooves jointly form the cavity.

[0014] By adopting the above scheme, the present invention has the following beneficial effects:

[0015] 1. Through the spring and the rotating drive mechanism with a specific structure, and the setting of two sets of ejector pins, the mold opening action can be used to drive the corresponding parts to perform the thread twisting action of the internal thread and the hard ejection action of the convex retaining ring in turn, without setting up an independent power source, effectively reducing the mold cost.

[0016] 2. By setting up an anti-fool rod, it is prevented that the spring failure will cause the internal thread threading action and the convex retaining ring to be hard-pushed out at the same time, causing the internal thread thread to be pulled over and deformed.

[0017] 3. By setting the movable rod and the material pulling hook, it can not only ensure that the injection molding head is automatically separated from the product, but also ensure that the injection molding head automatically falls off from the mold. There is no need to clean the material head after the injection molding is completed, and the production efficiency is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the bottle cap mold of the present invention in the first mold opening state;

[0019] Figure 2 It is a structural schematic diagram of another viewing angle of the bottle cap mold of the present invention in the mold opening state 1;

[0020] Figure 3 This is a structural schematic diagram of the bottle cap mold of the present invention in the second mold opening state;

[0021] Figure 4 This is a schematic structural diagram of the third mold opening state of the bottle cap mold of the present invention;

[0022] Figure 5 This is a schematic structural diagram of another perspective of the third mold opening state of the bottle cap mold of the present invention.

[0023] Some components are omitted in the figure, and the markings in the figure are corresponding as follows:

[0024] 10 - Panel; 20 - Front template;

[0025] 21 - Locking block; 22 - Guide inclined groove;

[0026] 23 - Connecting rod; 30 - Rear template;

[0027] 31 - Slide block; 40 - Support plate;

[0028] 41 - Hollow rod; 42 - Rifled screw;

[0029] 43 - Rifled nut; 44 - Driving gear;

[0030] 45 - Driven gear; 46 - Hollow ejector rod;

[0031] 47 - Core rod; 48 - Transition plate;

[0032] 50 - Bottom plate; 51 - Anti - fooling rod;

[0033] 52 - Hook; 53 - Slot;

[0034] 54 - Push rod; 60 - Square iron;

[0035] 70 - First ejector plate group; 71 - Ejector block;

[0036] 80 - Second ejector plate group; 81 - Spring;

[0037] 90 - Movable plate; 91 - First pull rod;

[0038] 92 - Second pull rod; 93 - Through hole;

[0039] 94 - Sprue hook needle. Detailed implementation manners

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] As Figures 1 - 5As shown in the figure, this embodiment provides a bottle cap mold. The bottle cap formed by this mold includes an outer cap and an inner cap integrally connected to the inner cavity of the outer cap. The openings of the outer cap and the inner cap face the same direction. An internal thread section is provided on the inner side wall of the outer cap, and a convex snap ring is provided on the inner side wall of the inner cap. Such bottle caps have been widely used in various cosmetic bottles or daily necessities bottles, and will not be elaborated here.

[0042] The composite bottle mold provided in this embodiment includes a panel 10, a front template 20, a rear template 30, a support plate 40, and a bottom plate 50 that are arranged in sequence and parallel to each other. Among them, two relatively arranged square irons 60 are fixedly connected between the support plate 40 and the bottom plate 50. The connection structures between the above-mentioned panel 10, front template 20, rear template 30, support plate 40, bottom plate 50, and square iron 60 are the same as those of a conventional injection mold or a standard mold base, such as being connected to each other through guide pillars and / or bolts, etc., and will not be elaborated here either.

[0043] A first ejector plate group 70 and a second ejector plate group 80 located on the side of the first ejector plate group 70 facing the bottom plate 50 are also provided between the support plate 40 and the bottom plate 50. Both the first ejector plate group 70 and the second ejector plate group 80 are located between the two square irons 60. The same as the structure of the ejector plate group used in a conventional injection mold, both the first ejector plate group 70 and the second ejector plate group 80 include an ejector plate panel and an ejector plate bottom plate that are fixedly connected to each other, that is, in this embodiment, a group of ejector plate groups in a conventional injection mold is changed to two groups. In addition, a relief perforation is provided on the second ejector plate group 80 so that the ejector rod of the injection molding machine can pass through the second ejector plate group 80 during use to push the first ejector plate group 70 to act. That is to say, the injection molding machine does not push the second ejector plate 80 to act during use. Of course, the relief perforation needs to be arranged corresponding to the ejector rod of the injection molding machine. In addition, the same as a conventional injection mold, a perforation corresponding to the ejector rod of the injection molding machine also needs to be provided on the bottom plate 50. Preferably, in order to reduce the idle stroke of the ejector rod of the injection molding machine and improve the injection molding efficiency, in this embodiment, a top block 71 that is fixedly connected to the first ejector plate group 70 and movably inserted into the relief perforation is provided.

[0044] A mold core is installed on one side of the rear template 30 facing the front template 20. The mold core can be embedded in the rear template 30 or fixedly connected to the surface of the rear template 30. At this time, a receiving groove needs to be opened in the front template 20 at the position corresponding to the mold core to ensure that the front template 20 and the rear template 30 can fit together after mold closing; a cavity penetrating through the front and rear is opened on the mold core. Preferably, in this embodiment, the mold core includes two sliders 31 respectively slidably connected to the moving template 30. Type grooves are respectively opened on the opposite sides of the two sliders 31. After the two sliders 31 are attached to each other, the two type grooves jointly form the above-mentioned cavity, so that the concave structure on the outer peripheral surface of the outer cover of the bottle cap can be formed. Of course, a sliding drive mechanism for driving the sliding of the sliders 31 needs to be connected to the sliders 31. The sliding drive mechanism can be a sliding drive mechanism for driving the sliders to realize side core pulling in a conventional injection mold. In this embodiment, the sliding drive mechanism includes a locking block 21 fixedly connected to the side wall of the front template 20. A guiding inclined groove 22 is opened on the locking block 21. The guiding inclined groove 22 is inclined from one end relatively close to the panel 10 to one end relatively close to the bottom plate 50 in a direction gradually away from the slider 31, and a guiding block is slidably connected in the guiding inclined groove 22. A connecting rod 23 is connected to the guiding block, and the connecting rod 23 is fixedly connected to the slider 31. In this way, when the mold is opened, since the front template 20 and the rear template 30 are separated from each other, the guiding block slides in the guiding inclined groove 22, and then drives the slider 31 to slide through the connecting rod 23. It should be noted that if there is no concave structure on the outer peripheral surface of the outer cover of the bottle cap, an integral mold core can also be used, and in this case, there is no need to set a sliding drive mechanism.

[0045] In order to allow the liquid material to flow into the mold cavity during injection molding, it is necessary to open a flow channel on the front template 20 or the rear template 30. The flow channel can be opened on the side of the front template 20 facing the rear template 30, or on the side of the rear template 30 facing the front template 20. Considering that after the injection molding is completed, the residual liquid material in the flow channel will solidify and form a material head. If the flow channel is opened on the side of the front template 20 facing the rear template 30, or on the side of the rear template 30 facing the front template 20, the material head will either be ejected together with the bottle cap and need to be cut off in the subsequent process, or it will be hung on the mold and need to be removed from the mold manually or by a robot, both of which will affect the production efficiency. Preferably, in this embodiment, a movable plate 90 is provided between the front template 20 and the panel 10, and the guide column for connecting the front template 20 and the panel 10 is inserted into the movable plate 90 at the same time. The movable plate 90 is slidably inserted with a solid A first pull rod 91 is fixedly connected to the panel 10, and a second pull rod 92 is slidably inserted on the front template 20 and fixedly connected to the movable plate 90. Limit blocks are provided on the ends of the first pull rod 91 and the second pull rod 92 away from the panel 10 to prevent the pull rods from sliding out of the corresponding plates. It should be noted that a screw can be directly used as a pull rod, and the nut of the screw can be used as a limit block; in addition, a flow channel connected to the cavity is opened on the side of the front template 20 facing the movable plate 90, and a through hole 93 arranged corresponding to the flow channel is opened on the movable plate 90, and a material head hook 94 that is movably inserted in the through hole 93 is fixedly connected to the panel 10. During the injection molding process, the slurry will flow into the through hole 93 (of course, if the slurry head hook needle 94 passes through the through hole 93 and is inserted in the flow channel, the slurry does not need to flow into the through hole 93), and hold the slurry head hook needle 94. When the mold is opened, the movable plate 90 and the front template 20 are separated from each other first, and the slurry head hook needle 94 will pull the slurry head to make it separate from the flow channel and break the connection between it and the bottle cap. This state is the mold opening state one of the mold; then the mold opening action continues, and the first pull rod 91 pulls the movable plate 90 to move, so that the movable plate 90 and the panel 10 are separated from each other, and the movable plate 90 is used to push the slurry head from the slurry head hook needle 94, so that it falls from the mold under the action of gravity, thereby realizing the separation of the slurry head and the mold. This state is the mold opening state two of the mold. At this time, the second pull rod 92 pulls the movable plate 90 to prevent it from moving further.

[0046] A hollow rod 41 is movably inserted through the supporting plate 40 and is also inserted into the cavity. An external thread section matching the internal thread section is provided at one end of the hollow rod 41 inserted into the cavity for forming the internal thread of the bottle cap, and the other end is fixedly connected to the second ejector pin group 80. The hollow rod 41 is connected with a rotary drive mechanism for driving the hollow rod 41 to rotate. The rotary drive mechanism includes a rack screw 42 with one end mounted on the front template 20, a rack nut 43 sleeved on the rack screw 42, a driving gear 44 fixedly sleeved on the rack nut 43, and a driven gear 45 directly or indirectly meshing with the driving gear 44. Herein, the driving gear 44 and the driven gear 45 indirectly meshing means that the driving gear 44 meshes with an intermediate gear, and the intermediate gear then meshes with the driven gear 45. The end of the rack screw 42 away from the front template 20 is fixedly connected to the bottom plate 50, the supporting plate 40 or the square iron 60. The rack screw 42 and the rack nut 43 can be directly purchased from the market, and their matching structure is a conventional structure. The driven gear 45 is fixedly sleeved on the hollow rod 41. A hollow ejector pin rod 46 is movably inserted through the inner hole of the hollow rod 41. One end of the hollow ejector pin rod 46 is fixedly connected to the first ejector pin plate group 70, and the position of the other end matches the position of the lower end of the inner cap of the bottle cap. A core rod 47 is movably inserted through the inner hole of the hollow ejector pin rod 46. An annular groove matching the convex snap ring is provided at one end of the core rod 47, and the other end is fixedly connected to the second ejector pin plate group 80. In addition, a spring 81 is directly or indirectly provided between the second ejector pin plate group 80 and the bottom plate 50. Preferably, in order to ensure that the rotary drive mechanism has sufficient installation space and reduce the assembly difficulty of the mold, in this embodiment, a transition plate 48 is further fixedly connected to the side of the supporting plate 40 facing the rear template 30, and an installation cavity for placing the driving gear 44 and the driven gear 45 is provided on the transition plate 48.

[0047] After the mold moves to the second mold opening state, the mold opening action continues, causing the front template 20 and the rear template 30 to separate from each other. During this process, the sliding drive mechanism will drive the two sliders 31 to move away from each other, so that the product formed in the cavity can be ejected. At the same time, the separation of the front template 20 and the rear template 30 will also cause the rack nut 43 to rotate, and then drive the hollow rod 41 to rotate through the corresponding gears, realizing the threading action. While threading, the second ejector pin plate group 80 drives the hollow ejector pin rod 46 and the core rod 47 to move synchronously under the action of the spring 81, avoiding the convex snap ring from detaching from the core rod 47 while assisting the threading action. When the hollow rod 41 is completely separated from the bottle cap, the threading action is completed, and this state is the third mold opening state of the mold. Then, the ejector rod of the injection molding machine is pushed out, driving the first ejector pin plate group 70 to move, so that the hollow ejector pin rod 46 moves relative to the core rod 47, and the bottle cap is ejected from the core rod 47 by using the hollow ejector pin rod 46 to realize demolding.

[0048] Considering that the spring 81 may experience fatigue failure after long-term use, at this time, when the mold is performing the thread milling operation, since the hollow ejector pin rod 46 and the core rod 47 cannot move synchronously, the convex snap ring disengaging from the core rod 47 will be disengaged from the core rod 47 under the thrust of the hollow rod 41. The pulling force generated at the moment of disengagement will cause the threads of the internal thread to be turned over and deformed. To avoid this situation, preferably, in this embodiment, a foolproof rod 51 is rotatably connected to the bottom plate 50. A hook 52 is provided at one end of the foolproof rod 51 away from the bottom plate 50. A slot 53 matching the hook 52 is formed on the first ejector plate group 70. At the same time, a guide slot 53 is formed on the foolproof rod 51 and is arranged obliquely with respect to the foolproof rod 51. The guide slot 53 is arranged obliquely away from each ejector plate group gradually from one end relatively close to the hook 52 to the other end. A push block is slidably connected in the guide slot 53, and a push rod 54 fixed to the second ejector plate group 80 is connected to the push block. In the mold-closed state, the hook 52 is inserted into the slot 53. When the second ejector plate group 80 moves under the action of the spring 81, the push rod 54 will push the side wall of the guide slot 53 through the push block, causing the foolproof rod 51 to rotate, and thus the hook 52 to disengage from the slot 53, without affecting the subsequent actions of the mold; when the spring 81 fails, during the thread milling operation, the second ejector plate group 80 will not move, and the hook 52 cannot disengage from the slot 53. When the ejector rod of the injection molding machine is pushed out, since the first ejector plate group 70 cannot move due to the clamping post, the injection molding machine will alarm because the ejector rod cannot act, and the failure of the spring 81 can be detected in time and repaired to avoid the threads of the internal thread being turned over and deformed.

[0049] The above has made a detailed description of the present invention in conjunction with the drawings. However, the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various changes and applications to the present invention according to the prior art. For example, the spring 81 in the above embodiments can be changed to an elastic rubber, etc. These all belong to the protection scope of the present invention.

Claims

1. A bottle cap mold, the bottle cap comprising an outer cap and an inner cap integrally connected to an inner cavity of the outer cap, the inner side wall of the outer cap is provided with an internal thread section, the inner side wall of the inner cap is provided with a convex buckle ring, the mold comprises a panel, a front template, a rear template, a support plate and a bottom plate arranged in sequence and parallel to each other, a square iron is fixedly connected between the support plate and the bottom plate, It is characterized in that A first ejector plate group and a second ejector plate group located on the side of the first ejector plate group facing the bottom plate are also provided between the support plate and the bottom plate, a mold core is installed on the side of the rear template facing the front template, a cavity penetrating front and back is provided on the mold core, a hollow rod is movably inserted into the support plate and simultaneously inserted into the cavity, one end of the hollow rod penetrating the cavity is provided with an external thread segment matching the internal thread segment, and the other end is fixedly connected to the second ejector plate group, the hollow rod is connected to a rotating drive mechanism for driving the hollow rod to rotate, and a hollow ejector rod is movably inserted into the inner hole of the hollow rod, one end of the hollow ejector rod is fixedly connected to the first ejector plate group, the hollow A core rod is movably inserted into the inner hole of the ejector rod, one end of the core rod is provided with a concave ring groove matching the convex buckle ring, and the other end is fixedly connected to the second ejector plate group, a spring is directly or indirectly provided between the second ejector plate group and the bottom plate, and a clearance hole is opened on the second ejector plate group, the rotary drive mechanism comprises a rifle screw rod with one end mounted on the front template, a rifle screw sleeve sleeved on the rifle screw rod, a driving gear fixedly sleeved on the rifle screw sleeve, and a driven gear directly or indirectly meshed with the driving gear, the end of the rifle screw rod away from the front template is fixedly connected to the bottom plate, the support plate or the square iron, and the driven gear is fixedly sleeved on the hollow rod; A transition plate is also fixedly connected to one side of the support plate facing the rear template, and a mounting cavity for placing the driving gear and the driven gear is provided on the transition plate; An anti-foolproof rod is rotatably connected to the bottom plate, a hook is provided on one end of the anti-foolproof rod away from the bottom plate, a slot cooperating with the hook is provided on the first ejector plate group, a guide slot inclined relative to the anti-foolproof rod is provided on the anti-foolproof rod, a push block is slidably connected in the guide slot, a push block is connected to a push rod fixed to the second ejector plate group, and the hook is inserted in the slot in the mold closing state.

2. The bottle cap mold according to claim 1, It is characterized in that A movable plate is arranged between the front template and the panel, a first pull rod fixedly connected to the panel is slidably inserted on the movable plate, a second pull rod fixedly connected to the movable plate is slidably inserted on the front template, a limiting block is arranged on one end of the first pull rod and the second pull rod away from the panel, a flow channel is provided on the side of the front template facing the movable plate, a through hole arranged corresponding to the flow channel is provided on the movable plate, and a material head hook needle movably inserted in the through hole is fixedly connected to the panel.

3. The bottle cap mold according to claim 1, It is characterized in that The first ejector plate assembly is fixedly connected with an ejector block which is movably inserted into the yielding hole.

4. The bottle cap mold according to claim 1, It is characterized in that The first ejector plate group and the second ejector plate group both include an ejector plate face plate and an ejector bottom plate fixedly connected to each other.

5. The bottle cap mold according to any one of claims 1 to 4, It is characterized in that The mold core includes two sliders respectively connected to the rear mold plate in a sliding manner. The two sliders are respectively provided with grooves on the sides facing each other. After the two sliders are fitted together, the two grooves jointly form the mold cavity.

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