An injection mold

Abstract

The present application relates to the technical field of cosmetic packaging production, and provides an injection mold. The injection mold includes an upper mold base and a lower mold base located below the upper mold base. The upper mold base is formed with a bottle shoulder groove. The lower mold base includes an outer mandrel assembly, an inner mandrel assembly, and an elastic member. The outer mandrel assembly includes an outer mandrel, and the inner mandrel assembly includes an inner mandrel. The inner mandrel is slidably disposed within the outer mandrel. The inner mandrel has an installation position extending out of the outer mandrel and an injection position retracted into the outer mandrel. When the inner mandrel is in the installation position, an inner bottle body can be sleeved onto the inner mandrel. When the inner mandrel is in the injection position, an outer bottle body, the outer mandrel, the inner bottle body, and the inner mandrel together form a bottle shoulder protrusion. The bottle shoulder groove and the bottle shoulder protrusion together enclose a bottle shoulder cavity. During the separation process of the upper mold base and the lower mold base, the elastic member pushes the inner mandrel assembly to slide the inner mandrel to the installation position. When the upper mold base and the lower mold base are in a separated state, the inner mandrel extends a certain distance relative to the outer mandrel, which makes it more convenient to install the inner bottle body and improves the production efficiency of the mold.

Description

Technical Field

[0001] This application relates to the technical field of cosmetic packaging production, and particularly relates to an injection mold. Background Art

[0002] An injection mold is a tool for producing plastic products and is also a tool for endowing plastic products with a complete structure and precise dimensions. Injection molding is a processing method used in mass-producing some parts with complex shapes. Specifically, it means injecting the heat-melted plastic into the mold cavity under high pressure by an injection molding machine, and after cooling and solidifying, a formed product is obtained.

[0003] In the prior art, a preform is a commonly used injection mold for storing cosmetics. The preform includes a bottle body and a bottle shoulder. Most of the existing preforms are produced by injection molding using an injection mold. Specifically, first, the already formed bottle body is sleeved on the core rod of the injection mold, and then the upper end of the bottle body is injection molded with a bottle shoulder through the injection mold to form an integral preform. However, the existing injection molds for preforms have the following deficiencies. Conventional injection molds for preforms cannot achieve the injection molding of the bottle shoulder with a double-layer bottle body. When it is necessary to inject the bottle shoulder with a double-layer bottle body, it is difficult to install the inner bottle body during the pre-installation of the bottle body. Summary of the Invention

[0004] In view of this, an embodiment of this application provides an injection mold, which solves at least one of the above problems.

[0005] To achieve the above object, the technical solution of the embodiment of this application is realized as follows:

[0006] An injection mold provided by this application includes an upper mold base and a lower mold base located below the upper mold base. The upper mold base and the lower mold base can be separated or closed.

[0007] The upper mold base is formed with a bottle shoulder groove and an injection runner communicating with the bottle shoulder groove.

[0008] The lower mold base includes an outer core rod assembly, an inner core rod assembly, and an elastic member. The outer core rod assembly includes an outer core rod for sleeving an outer bottle body. The inner core rod assembly includes an inner core rod for sleeving an inner bottle body. The inner core rod is slidably disposed within the outer core rod. The inner core rod has an installation position extending out of the outer core rod and an injection position retracted into the outer core rod. When the inner core rod is in the installation position, the inner bottle body can be sleeved onto the inner core rod. When the inner core rod is in the injection position, the outer bottle body, the outer core rod, the inner bottle body, and the inner core rod together form a bottle shoulder protrusion. The bottle shoulder groove and the bottle shoulder protrusion together enclose a bottle shoulder cavity.

[0009] During the separation process of the upper mold base and the lower mold base, the elastic member pushes the inner core rod assembly to make the inner core rod slide to the installation position.

[0010] During the mold closing process of the upper mold base and the lower mold base, the upper mold base presses the inner core rod assembly to cause the inner core rod to slide to the injection position.

[0011] In some embodiments, the inner core rod assembly includes an inner rod backing plate, the lower mold base includes a base located below the inner rod backing plate, the bottom of the inner core rod is disposed on the inner rod backing plate, and the elastic member abuts between the inner rod backing plate and the base.

[0012] In some embodiments, the elastic member is a compression spring, an upper groove is formed at the upper end of the base, and the elastic member is embedded in the upper groove; and / or, a lower groove is formed at the lower end of the inner rod backing plate, and the elastic member is embedded in the lower groove.

[0013] In some embodiments, the outer core rod assembly includes side plates and an outer rod backing plate located above the inner rod backing plate. The side plates connect the outer rod backing plate to the base. The bottom of the outer core rod is disposed on the outer rod backing plate, and the inner core rod passes through the outer rod backing plate and is sleeved inside the outer core rod.

[0014] In some embodiments, the lower mold base includes a limiting plate located above the outer rod backing plate, and the upper end of the limiting plate abuts against the lower end of the outer bottle body.

[0015] In some embodiments, the lower mold base includes a limiting screw and a limiting nut;

[0016] The limiting screw is disposed at the upper end of the outer rod backing plate. The limiting screw passes through the limiting plate, and the limiting plate can slide in the up and down direction. The limiting nut is in threaded cooperation with the limiting screw, and the limiting nut abuts against the upper and lower ends of the limiting plate respectively to fix the limiting plate at a preset height.

[0017] In some embodiments, at least one air outlet is formed at the position of the inner core rod where the inner bottle body is located. At least one air inlet is formed on the inner rod backing plate. An air flow channel is formed between the air inlet and the air outlet. High-pressure gas can be blown from the air inlet through the air flow channel from the air outlet to the inner peripheral wall of the inner bottle body.

[0018] In some embodiments, the inner core rod assembly includes a thimble guide post disposed at the upper end of the inner rod backing plate. During the mold closing process of the upper mold base and the lower mold base, the upper mold base abuts against the thimble guide post, and the thimble guide post drives the inner rod backing plate to slide downward, so that the inner core rod retracts from the installation position to the injection position.

[0019] In some embodiments, the lower mold base includes a limit sleeve disposed between the outer peripheral wall of the inner core rod and the inner peripheral wall of the outer core rod, and the upper end of the limit sleeve abuts against the lower end of the inner bottle body.

[0020] In some embodiments, the upper mold base includes:

[0021] A sprue gate assembly for adding injection molding raw materials, with an injection molding runner formed therein;

[0022] A dental mold moving die assembly located below the sprue gate assembly, with a neck mold groove formed therein, and the injection molding runner communicating with the neck mold groove;

[0023] A shoulder mold assembly located below the dental mold moving die assembly, with a shoulder mold groove formed therein, and the neck mold groove and the shoulder mold groove together form the bottle shoulder groove, and the dental mold moving die assembly and the shoulder mold assembly can be separated or closed.

[0024] In some embodiments, the dental mold moving die assembly includes a first slider with a first half groove formed therein and a second slider with a second half groove formed therein; during the closing process of the dental mold moving die assembly and the shoulder mold assembly, the first slider and the second slider move towards each other to close, so that the first half groove and the second half groove are spliced to form the neck mold groove; during the separation process of the dental mold moving die assembly and the shoulder mold assembly, the first slider and the second slider move away from each other.

[0025] In some embodiments, the dental mold moving die assembly includes a first inclined guide post, a second inclined guide post and a slider pressing plate;

[0026] Both the first slider and the second slider abut against the shoulder mold assembly, and the slider pressing plate is connected to the circumference of the shoulder mold assembly and presses on the first slider and the second slider;

[0027] The first inclined guide post passes through the first slider, the second inclined guide post passes through the second slider, and the distance between the first inclined guide post and the second inclined guide post gradually increases from top to bottom;

[0028] During the closing process of the dental mold moving die assembly and the shoulder mold assembly, the shoulder mold assembly drives the slider pressing plate to slide upward, the slider pressing plate pushes the first slider and the second slider to slide along the first inclined guide post and the second inclined guide post, and the first slider and the second slider move towards each other to close; during the separation process of the dental mold moving die assembly and the shoulder mold assembly, the shoulder mold assembly drives the slider pressing plate to slide downward, the slider pressing plate pulls the first slider and the second slider to slide along the first inclined guide post and the second inclined guide post, and the first slider and the second slider move away from each other.

[0029] In some embodiments, the injection mold includes a limiting slide plate and a connecting member located circumferentially on the upper mold base. The limiting slide plate is formed with a limiting chute extending in the up and down directions;

[0030] One of the limiting slide plate and the connecting member is connected to the dental mold moving component, and the other of the limiting slide plate and the connecting member is connected to the shoulder mold component. The connecting member extends into the limiting chute, and the connecting member can slide along the limiting chute.

[0031] In some embodiments, the inner core rod assembly includes an adjusting guide post and a closer. The shoulder mold component is formed with an adjusting hole. The adjusting guide post is arranged in the up and down direction. The closer is arranged at the upper end of the adjusting guide post. The closer is inserted into the adjusting hole. The outer peripheral wall of the closer is in frictional fit with the inner peripheral wall of the adjusting hole, so that the dental mold moving component and the shoulder mold component are separated first, and then the upper mold base and the lower mold base are separated.

[0032] An injection mold provided by the present application can, on the one hand, produce a container with a double-layer tube bottle. Both the inner bottle and the bottle body are connected through the same bottle shoulder, so that only one injection process is required for the inner bottle and the outer bottle of the container, thus simplifying the injection process of the container with a double-layer tube bottle, using less material for the injection-molded container, and reducing the production cost of the product. On the other hand, when the upper mold base and the lower mold base are in a separated state, setting an elastic member to push the inner core rod assembly can make the inner core rod extend a certain distance relative to the outer core rod, so that the installation of the inner bottle body is more convenient, and the production efficiency of the mold is improved. Description of the Drawings

[0033] Figure 1 is a schematic diagram of the product structure of the injection mold according to an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the structure of the injection mold according to an embodiment of the present application;

[0035] Figure 3 is Figure 2 a structural exploded view of the structure shown, in which the lower mold base is schematically shown;

[0036] Figure 4 is Figure 2 a schematic diagram of another perspective of the structure shown;

[0037] Figure 5 is Figure 2 a schematic diagram of yet another perspective of the structure shown;

[0038] Figure 6 is Figure 2 a schematic diagram of still another perspective of the structure shown;

[0039] Figure 7 The Figure 6 D-D sectional view of the structure shown;

[0040] Figure 8 The Figure 5 A-A sectional view of the structure shown;

[0041] Figure 9 The Figure 8 Enlarged view at position E of the structure shown;

[0042] Figure 10 The Figure 8 Enlarged view at position F of the structure shown;

[0043] Figure 11 The Figure 5 B-B sectional view of the structure shown;

[0044] Figure 12 The Figure 5 C-C sectional view of the structure shown;

[0045] Figure 13 The Figure 2 Exploded view of the structure shown, which schematically shows the dental mold slider assembly.

[0046] Description of reference numerals:

[0047] Injection mold 100; inner bottle body 201; outer bottle body 202; external thread teeth 203; bottle shoulder cavity 100a; upper mold base 1; bottle shoulder groove 1a; injection runner 1b; nozzle assembly 11; feed port 11a; dental mold slider assembly 12; neck mold groove 12a; first slider 121; first half groove 121a; second slider 122; second half groove 122a; first inclined guide post 123; second inclined guide post 124; slider pressure plate 125; slider seat 126; shoulder mold assembly 13; shoulder mold groove 13a; adjustment hole 13b; lower mold base 2; outer mandrel assembly 21; outer mandrel 211; outer rod backing plate 212; side plate 213; bottle shoulder convex 2a; inner mandrel assembly 22; air passage runner 22a; inner mandrel 221; stepped surface 2211; air outlet 221a; inner rod backing plate 222; lower groove 222a; air inlet 222b; ejector guide post 223; adjustment guide post 224; closer 225; elastic member 23; base 24; upper groove 24a; limit plate 25; limit screw 26; limit nut 27; limit sleeve 28; limit slide plate 3; limit slide groove 3a; connecting member 4. Detailed implementation manners

[0048] It should be noted that the various embodiments / implementation manners provided in this application can be combined with each other without conflict. The detailed descriptions in the detailed implementation manners should be understood as explanatory descriptions of the purpose of this application and should not be regarded as improper restrictions on this application.

[0049] In the description of the present application, the terms "upper", "lower", "left", "right", "front", and "rear" are based on the orientation shown in the appended Figure 2 and the appended Figure 3 The terms "length direction", "width direction", and "height direction" are based on the positional relationship of the injection mold shown in the appended Figure 2 and the appended Figure 3 It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. The terms "first / second" are only used to distinguish different objects and do not indicate that there is any same or related relationship between the two.

[0050] In the prior art, for a container with a double-layer tube bottle, it often forms a container with a double-layer tube bottle by separately injection-molding two tube bottles of different sizes and then sleeving and assembling the small tube bottle inside the large tube bottle. In this process, the small tube bottle and the large tube bottle need to be injection-molded separately, and both the small tube bottle and the large tube bottle have independent bottle shoulders. After assembly, more container materials are used and the production cost is high.

[0051] An embodiment of the present application provides an injection mold. Please refer to Figures 1 to 5 、 Figure 8 、 Figure 10 and Figure 11 The injection mold 100 includes an upper mold base 1 and a lower mold base 2 located below the upper mold base 1. The upper mold base 1 and the lower mold base 2 can be separated or closed.

[0052] The upper mold base 1 is formed with a bottle shoulder groove 1a and an injection runner 1b communicating with the bottle shoulder groove 1a. The injection raw material can flow to the bottle shoulder groove 1a through the injection runner 1b.

[0053] The lower mold base 2 includes an outer mandrel assembly 21, an inner mandrel assembly 22, and an elastic member 23. The outer mandrel assembly 21 includes an outer mandrel 211 for sleeving an outer bottle body 202. The inner mandrel assembly 22 includes an inner mandrel 221 for sleeving an inner bottle body 201. The inner mandrel 221 is slidably disposed within the outer mandrel 211. The inner mandrel 221 has a mounting position extending out of the outer mandrel 211 and an injection molding position retracted into the outer mandrel 211. When the inner mandrel 221 is in the mounting position, the inner bottle body 201 can be sleeved onto the inner mandrel 221. When the inner mandrel 221 is in the injection molding position, the outer bottle body 202, the outer mandrel 211, the inner bottle body 201, and the inner mandrel 221 together form a bottle shoulder convex 2a. The bottle shoulder groove 1a and the bottle shoulder convex 2a together enclose a bottle shoulder cavity 100a. Specifically, the inner bottle body 201 and the outer bottle body 202 are prefabricated. First, the tubular inner bottle body 201 is sleeved on the outer peripheral wall of the inner mandrel 221. After the tubular outer bottle body 202 is sleeved on the outer peripheral wall of the outer mandrel 211, the contours of the upper ends of the outer bottle body 202, the outer mandrel 211, the inner bottle body 201, and the inner mandrel 221 together form a bottle shoulder convex 2a that matches the inner shape of the bottle shoulder of the preform. After the bottle shoulder convex 2a and the bottle shoulder groove 1a enclose together, the liquid injection molding raw material flows into the bottle shoulder cavity 100a through the injection molding runner 1b communicating with the bottle shoulder groove 1a. After the injection molding raw material located in the bottle shoulder cavity 100a is cooled, a solidified bottle shoulder is formed. At the same time, the solidified bottle shoulder is respectively joined to the inner bottle body 201 and the outer bottle body 202. Finally, the bottle shoulder, the inner bottle body 201, and the outer bottle body 202 together form a preform with an integrally formed double-layer tube bottle structure.

[0054] During the separation process of the upper mold base 1 and the lower mold base 2, that is, during the mold opening process between the upper mold base 1 and the lower mold base 2, the elastic member 23 pushes the inner mandrel assembly 22 to make the inner mandrel 221 slide to the mounting position. Since the inner bottle body 201 is located between the outer peripheral wall of the inner mandrel 221 and the inner peripheral wall of the outer mandrel 211 during injection molding, and the wall thickness of the bottle body of the preform for cosmetics is relatively thin, the inner bottle body 201 cannot be easily sleeved between the outer peripheral wall of the inner mandrel 221 and the inner peripheral wall of the outer mandrel 211. Therefore, when the upper mold base 1 and the lower mold base 2 are in the separated state, setting the elastic member 23 to push the inner mandrel assembly 22 can make the inner mandrel 221 extend a certain distance relative to the outer mandrel 211.

[0055] During the mold closing process of the upper mold base 1 and the lower mold base 2, the upper mold base 1 presses the inner mandrel assembly 22 to make the inner mandrel 221 slide to the injection molding position. In this way, the inner mandrel 221 can slide from the mounting position to the injection molding position, ensuring that after the upper mold base 1 and the lower mold base 2 are closed, the contours of the upper ends of the inner bottle body 201 and the inner mandrel 221 together form a bottle shoulder convex 2a that matches the inner shape of the bottle shoulder of the preform.

[0056] An injection mold 100 provided in an embodiment of the present application can, on the one hand, produce a container with a double-layer tube bottle. The inner bottle and the bottle body are both connected by the same bottle shoulder, so that only one injection process is required for the inner bottle and the outer bottle of the container, thus simplifying the injection process of the container with a double-layer tube bottle, using less material for the injection-molded container, and reducing the production cost of the product. On the other hand, when the upper mold base 1 and the lower mold base 2 are in a separated state, the elastic member 23 is arranged to push the inner core rod assembly 22, so that the inner core rod 221 can extend a certain distance relative to the outer core rod 211. This makes it more convenient to install the inner bottle body 201 and improves the production efficiency of the mold.

[0057] In one embodiment, please refer to Figure 3 , Figure 5 , Figure 8 and Figure 11 , the inner core rod assembly 22 includes an inner rod backing plate 222, the lower mold base 2 includes a base 24 located below the inner rod backing plate 222, the bottom of the inner core rod 221 is arranged on the inner rod backing plate 222, and the elastic member 23 is abutted between the inner rod backing plate 222 and the base 24. Specifically, the injection mold 100 of the present application can inject and produce multiple preforms at one time. Multiple inner core rods 221 are arranged on the inner rod backing plate 222, the lower ends of the multiple inner core rods 221 are all connected to the inner rod backing plate 222, the upper end of the elastic member 23 abuts against the lower end of the inner rod backing plate 222, and the lower end abuts against the upper end of the base 24. The elastic member 23 between the inner rod backing plate 222 and the base 24 can push the inner rod backing plate 222 upward relative to the base 24 by a certain distance, so that the multiple inner core rods 221 slide from the injection position to the installation position.

[0058] Exemplarily, in one embodiment, please refer to Figure 3 , Figure 5 , Figure 8 and Figure 11 , the elastic member 23 is a compression spring, an upper groove 24a is formed at the upper end of the base 24, and the elastic member 23 is embedded in the upper groove 24a; and / or, a lower groove 222a is formed at the lower end of the inner rod backing plate 222, and the elastic member 23 is embedded in the lower groove 222a. That is to say, the upper groove 24a can be opened on the upper end surface of the base 24, the lower groove 222a can be opened on the lower end surface of the inner rod bottom plate, or the upper groove 24a and the lower groove 222a can be opened at the same time. With such a setting, the compression spring can be embedded in the upper groove 24a and / or the lower groove 222a, and the upper groove 24a and the lower groove 222a can fix the compression spring at a preset position, thus facilitating the installation of the compression spring.

[0059] In one embodiment, please refer to Figure 3 , Figures 5 to 8 and Figure 11, the outer mandrel assembly 21 includes side plates 213 and an outer mandrel backing plate 212 located above the inner mandrel backing plate 222. The side plates 213 connect the outer mandrel backing plate 212 to the base 24. The bottom of the outer mandrel 211 is disposed on the outer mandrel backing plate 212, and the inner mandrel 221 passes through the outer mandrel backing plate 212 and is sleeved inside the outer mandrel 211. Specifically, the injection mold 100 of the present application can inject and produce multiple preforms at one time. To match the inner mandrel assembly 22, multiple outer mandrels 211 are also provided on the outer mandrel backing plate 212. Multiple inner mandrels 221 pass through the outer mandrel backing plate 212 and are respectively sleeved inside multiple outer mandrels 211. The connection manner of the base 24, the side plates 213, and the outer mandrel backing plate 212 is not limited. Exemplarily, the side plates 213 and the outer mandrel backing plate 212 are fixedly connected to the base 24 by bolts. With such a setting, the outer mandrel backing plate 212 is fixed to the base 24 through the side plates 213. That is to say, the position of the outer mandrel backing plate 212 relative to the base 24 remains unchanged. The upper end of the elastic member 23 abuts against the inner mandrel backing plate 222, and the lower end abuts against the base 24. When the inner bottle body 201 needs to be installed, the elastic member 23 can make the inner mandrel 221 at the upper end of the inner mandrel backing plate 222 slide upward relative to the outer mandrel 211, so as to facilitate the installation of the inner bottle body 201.

[0060] In one embodiment, please refer to Figure 3 , Figures 5 to 9 , the lower mold base 2 includes a limit sleeve 28. The limit sleeve 28 is disposed between the outer peripheral wall of the inner mandrel 221 and the inner peripheral wall of the outer mandrel 211. The upper end of the limit sleeve 28 abuts against the lower end of the inner bottle body 201. The limit sleeve 28 can adjust the bottle height of the inner bottle body 201. Different sizes and heights of the limit sleeve 28 can be set to facilitate the injection molding of inner bottle bodies 201 with different bottle heights. A stepped surface 2211 is further formed on the outer peripheral wall of the inner mandrel 221, so that the lower end of the limit sleeve 28 can abut against the stepped surface 2211.

[0061] In one embodiment, please refer to Figure 3 , Figures 5 to 9 , the lower mold base 2 includes a limit plate 25 located above the outer mandrel backing plate 212. The upper end of the limit plate 25 abuts against the lower end of the outer bottle body 202. The limit plate 25 can adjust the bottle height of the outer bottle body 202. The limit plate 25 can be set at different heights to facilitate the injection molding of inner bottle bodies 201 with different bottle heights.

[0062] The fixing manner of the limit plate 25 is not limited. For example, a pipe clamp structure such as an elastic hoop or a circlip can be used. The pipe clamp structure is elastically clamped to the outer peripheral wall of the outer mandrel 211 by its own elasticity. The lower end of the limit plate 25 abuts against the upper side of the pipe clamp structure, thereby fixing the limit plate 25 at a preset height. Another example, in one embodiment, please refer to Figure 3 , Figures 5 to 9, the lower mold base 2 includes a limit screw 26 and a limit nut 27. A limit screw 26 is provided at the upper end of the outer rod backing plate 212. The limit screw 26 passes through the limit plate 25. The limit plate 25 can slide in the up and down direction. The limit nut 27 is in threaded cooperation with the limit screw 26 and the limit nut 27 abuts against the upper and lower ends of the limit plate 25 respectively to fix the limit plate 25 at a preset height. Specifically, the limit plate 25 is arranged along the length direction of the injection mold 100. A plurality of outer core rods 211 pass through the limit plate 25. One limit screw 26 is passed through the front and rear ends of the limit plate 25. The two limit nuts 27 on each limit screw 26 clamp and abut against the upper and lower ends of the limit plate 25 to fix the limit plate 25 at a preset height. In this way, the height positions of the two limit nuts 27 on the limit screw 26 can be adjusted up and down, so as to adjust the height position of the limit plate 25, so that the limit plate 25 can adapt to the bottle body height of different outer bottle bodies 202 and limit it.

[0063] In one embodiment, please refer to Figure 5 、 Figure 8 and Figure 9 , at least one air outlet 221a is formed at the inner core rod 221 at the inner bottle body 201. At least one air inlet 222b is formed in the inner rod backing plate 222. An air flow channel 22a is formed between the air inlet 222b and the air outlet 221a. High-pressure gas can be blown from the air inlet 222b through the air flow channel 22a from the air outlet 221a to the inner peripheral wall of the inner bottle body 201. During the process of the upper mold base 1 and the lower mold base 2 being opened, the inner core rod assembly 22 with the air flow channel 22a is arranged, which can assist the preform that has been cooled and formed to be separated from the lower mold base 2. Specifically, after the preform is cooled, the preform pre-cools and shrinks and forms a vacuum with the bottle shoulder convex 2a and is difficult to demold. An air flow channel 22a is opened in the inner core rod assembly 22, and air flow is introduced at the air inlet 222b and blown to the inner peripheral wall of the inner bottle body 201, so that the preform can be smoothly demolded.

[0064] In one embodiment, please refer to Figure 5 、 Figure 8 and Figure 9 , the inner core rod assembly 22 includes a thimble guide post 223 provided at the upper end of the inner rod backing plate 222. During the process of the upper mold base 1 and the lower mold base 2 being closed, the upper mold base 1 abuts against the thimble guide post 223, and the thimble guide post 223 drives the inner rod backing plate 222 to slide downward, so that the inner core rod 221 retracts from the installation position to the injection position.

[0065] Specifically, when the lower mold base 2 is separated from the upper mold, the elastic member 23 is in a relaxed state. At this time, the inner core rod assembly is pushed upward by the elastic member 23, so that the inner core rod 221 is located at the installation position extending out of the outer core rod 211. During the process of the upper mold base 1 and the lower mold base 2 being closed, the upper end of the ejector pin guide post 223 abuts against the lower end of the upper mold base 1, and the lower end of the ejector pin guide post 223 is connected to the inner rod backing plate 222. The upper mold base 1 pushes the inner rod backing plate 222 to slide downward through the ejector pin guide post 223, and the elastic member 23 located at the lower end of the inner rod backing plate 222 contracts, so that the inner core rod 221 retracts to the injection position inside the outer core rod 211.

[0066] That is to say, in the embodiment of the present application, the self-action of the upper and lower mold bases 2 of the mold is directly utilized to realize the retraction of the inner core rod 221. The ejector pin guide post 223 plays a role in transmitting force, and the self-driving force of the upper and lower mold bases 2 of the mold is directly utilized to drive the inner core rod 221 to retract. The structure is simple and has high reliability, and there is no need to set other driving structures to drive the inner core rod 221 to retract.

[0067] In one embodiment, please refer to Figure 5 、 Figure 8 and Figure 10 . The upper mold base 1 includes a sprue gate assembly 11, a die insert slide block assembly 12 and a shoulder mold assembly 13. The sprue gate assembly 11 is used for adding injection molding raw materials, and an injection molding runner 1b is formed inside the sprue gate assembly 11. Specifically, a feed port 11a for adding injection molding raw materials is formed at the upper end of the sprue gate assembly 11, and an injection molding runner 1b that respectively flows to a plurality of bottle shoulder cavities 100a is formed inside the sprue gate assembly 11.

[0068] The die insert slide block assembly 12 is located below the sprue gate assembly 11. The die insert slide block assembly 12 forms a neck mold groove 12a, and the injection molding runner 1b communicates with the neck mold groove 12a. The shoulder mold assembly 13 is located below the die insert slide block assembly 12. The shoulder mold assembly 13 forms a shoulder mold groove 13a. The neck mold groove 12a and the shoulder mold groove 13a together form a bottle shoulder groove 1a, and the die insert slide block assembly 12 and the shoulder mold assembly 13 can be separated or closed.

[0069] Since the neck of the preform has an external thread tooth 203, and the external thread tooth 203 is an undercut structure, if the upper mold base 1 and the lower mold base 2 are directly opened, the undercut structure of the external thread tooth 203 will prevent the preform from being removed from the upper mold base 1. Therefore, the upper mold base 1 is provided with a die insert slide block assembly 12 having a neck mold groove 12a for injection molding the neck structure with an undercut external thread tooth 203, and the upper mold base 1 is provided with a shoulder mold assembly 13 having a shoulder mold groove 13a for injection molding the shoulder structure. After the bottle shoulder is formed, the die insert slide block assembly 12 and the shoulder mold assembly 13 can be separated or closed to realize the smooth opening of the preform.

[0070] Exemplarily, please refer to Figure 8 、 Figure 11 、 Figure 12 andFigure 13 The dental mold slide assembly 12 includes a first slider 121 formed with a first half groove 121a and a second slider 122 formed with a second half groove 122a; during the closing process of the dental mold slide assembly 12 and the shoulder mold assembly 13, the first slider 121 and the second slider 122 are closed toward each other so that the first half groove 121a and the second half groove 122a are spliced ​​to form the neck mold groove 12a; during the separation process of the dental mold slide assembly 12 and the shoulder mold assembly 13, the first slider 121 and the second slider 122 are separated from each other. Specifically, the first slider 121 and the second slider 122 are both strip-shaped structures and are extended and arranged along the length direction of the injection mold 100. A plurality of first half grooves 121a are formed on the right end of the first slider 121, and a plurality of second half grooves 122a are formed on the left end of the second slider 122. The first half grooves 121a and the second half grooves 122a correspond to each other one by one and are spliced ​​or separated along the width direction of the injection mold 100.

[0071] That is to say, the neck mold groove 12a is not an integral structure, but is formed by splicing the first half groove 121a and the second half groove 122a. The first slider 121 and the second slider 122 are closed together and spliced ​​to form the neck mold groove 12a, which is used for injection molding the neck of the bottle embryo. After the first slider 121 and the second slider 122 are separated from each other, the neck with the external thread 203 can be smoothly detached from the neck mold groove 12a.

[0072] The first slider 121 and the second slider 122 can be separated or closed by using an external driving structure, or can be realized by the closing or separation action of the dental mold slide assembly 12 and the shoulder mold assembly 13. Figure 8 , Figure 11 , Figure 12 and Figure 13 , the dental mold slide assembly 12 includes a first oblique guide column 123, a second oblique guide column 124 and a slider pressure plate 125. The first slider 121 and the second slider 122 are both in contact with the shoulder mold assembly 13, and the slider pressure plate 125 is connected to the circumference of the shoulder mold assembly 13 and pressed on the first slider 121 and the second slider 122. Specifically, the slider pressure plate 125 is connected to the shoulder mold assembly 13 by screws, and the two slider pressure plates 125 are respectively located at the front and rear ends of the shoulder mold assembly 13 and press the front and rear ends of the first slider 121 and the second slider 122 respectively. The slider pressure plate 125 can press the first slider 121 and the second slider 122 on the upper end surface of the shoulder mold assembly 13, and the first slider 121 and the second slider 122 can always remain on the upper end surface of the shoulder mold assembly 13 regardless of whether the dental mold slide assembly 12 and the shoulder mold assembly 13 are separated or molded.

[0073] The first inclined guide post 123 is inserted through the first slider 121, and the second inclined guide post 124 is inserted through the second slider 122. The distance between the first inclined guide post 123 and the second inclined guide post 124 gradually increases from top to bottom. Specifically, the first inclined guide post 123 inclines to the left from top to bottom, and the second inclined guide post 124 inclines to the right from top to bottom.

[0074] During the mold closing process of the dental mold moving die assembly 12 and the shoulder mold assembly 13, the shoulder mold assembly 13 drives the slider pressure plate 125 to slide upward. The slider pressure plate 125 pushes the first slider 121 and the second slider 122 to slide along the first inclined guide post 123 and the second inclined guide post 124, and the first slider 121 and the second slider 122 close together towards each other; that is to say, while the shoulder mold assembly 13 drives the first slider 121 and the second slider 122 to slide upward, the first inclined guide post 123 will guide the first slider 121 to slide to the right on the upper end surface of the shoulder mold assembly 13. Similarly, the second inclined guide post 124 will guide the second slider 122 to slide to the left on the upper end surface of the shoulder mold assembly 13 to realize the closing of the first slider 121 and the second slider 122.

[0075] During the mold opening process of the dental mold moving die assembly 12 and the shoulder mold assembly 13, the shoulder mold assembly 13 drives the slider pressure plate 125 to slide downward. The slider pressure plate 125 pulls the first slider 121 and the second slider 122 to slide along the first inclined guide post 123 and the second inclined guide post 124, and the first slider 121 and the second slider 122 separate away from each other. That is to say, when the slider pressure plate 125 drives the first slider 121 and the second slider 122 to slide downward, the first inclined guide post 123 will guide the first slider 121 to slide to the left on the upper end surface of the shoulder mold assembly 13. Similarly, the second inclined guide post 124 will guide the second slider 122 to slide to the right on the upper end surface of the shoulder mold assembly 13 to realize the separation of the first slider 121 and the second slider 122.

[0076] Specifically, the dental mold moving die assembly 12 further includes a moving die seat 126. When the dental mold moving die assembly 12 and the shoulder mold assembly 13 are in the mold closed state, the lower end surface of the moving die seat 126 abuts against the upper end surface of the shoulder mold assembly 13. The first slider 121 and the second slider 122 are embedded in the lower end surface of the moving die seat 126, and both the first inclined guide post 123 and the second inclined guide post 124 are inserted and fixed in the moving die seat 126. When the dental mold moving die assembly 12 and the shoulder mold assembly 13 are in the mold open state, the lower end surface of the moving die seat 126 separates from the upper end surface of the shoulder mold assembly 13, and the slider pressure plate 125 drives the first slider 121 and the second slider 122 to be pulled out from the lower end surface of the moving die seat 126. On the one hand, the moving die seat 126 can fix the position of the first inclined guide post 123 relative to the first slider 121 and the position of the second inclined guide post 124 relative to the second slider 122 to ensure smooth mold opening; on the other hand, the upper end of the moving die seat 126 forms a water receiving port assembly 11, and the lower end abuts against the shoulder mold assembly 13, playing a role of connecting the upper and the lower.

[0077] In one embodiment, please refer to Figure 6 and Figure 7 , the injection mold 100 includes a limiting slide plate 3 and a connecting member 4 located circumferentially on the upper mold base 1. The limiting slide plate 3 is formed with a limiting chute 3a extending in the up and down directions;

[0078] One of the limiting slide plate 3 and the connecting member 4 is connected to the dental mold moving component 12, and the other of the limiting slide plate 3 and the connecting member 4 is connected to the shoulder mold component 13. The connecting member 4 extends into the limiting chute 3a, and the connecting member 4 can slide along the limiting chute 3a. That is to say, it can be that the limiting slide plate 3 is connected to the dental mold moving component 12 and the connecting member 4 is connected to the shoulder mold component 13; or it can be that the limiting slide plate 3 is connected to the shoulder mold component 13 and the connecting member 4 is connected to the dental mold moving component 12.

[0079] Specifically, in one embodiment, please refer to Figure 7 , two limiting slide plates 3 are respectively connected to the left and right sides of the moving seat 126 by screws. The lower part of the limiting slide plate 3 is formed with a limiting chute 3a extending in the up and down directions. The connecting member 4 is a screw and is inserted into the limiting chute 3a. With such a setting, the opening height of the dental mold moving component 12 and the shoulder mold component 13 can be controlled. That is, after the moving seat 126 and the upper end surface of the shoulder mold component 13 are separated to a preset height, the connecting member 4 will abut against one end of the limiting chute 3a to prevent the moving seat 126 and the shoulder mold component 13 from separating further. Thus, it is ensured that the injection mold 100 can be opened normally.

[0080] In one embodiment, please refer to Figure 3 , Figure 5 and Figure 12 , the inner core rod assembly 22 includes an adjusting guide post 224 and a closer 225. The shoulder mold component 13 is formed with an adjusting hole 13b. The adjusting guide post 224 is arranged in the up and down directions. The closer 225 is arranged at the upper end of the adjusting guide post 224. The closer 225 is inserted into the adjusting hole 13b. The outer peripheral wall of the closer 225 is in frictional fit with the inner peripheral wall of the adjusting hole 13b, so that the dental mold moving component 12 and the shoulder mold component 13 are separated first, and then the upper mold base 1 and the lower mold base 2 are separated. Specifically, when the injection mold 100 is opened, the upper mold base 1 has a tendency to move relatively upward away from the lower mold base 2 under the action of an external force. At this time, since there is a closer 225 between the shoulder mold component 13 and the adjusting guide post 224, the static friction force between the closer 225 and the adjusting hole 13b will cause the upper and lower mold bases 2 to require a preset separation force to separate when opening the mold. Thus, the lower end surface of the moving seat 126 and the upper end surface of the shoulder mold component 13 will be separated first, thereby releasing the undercut; when the connecting member 4 abuts against one end of the limiting chute 3a to prevent the moving seat 126 and the shoulder mold component 13 from separating further, when the separation force continues to increase and the static friction force between the closer 225 and the adjusting hole 13b is less than the preset separation force, the upper mold base 1 and the lower mold base 2 will be separated again.

[0081] Since the neck of the preform is formed with an undercut structure of external thread teeth 203, therefore, in the embodiment of the present application, by providing an adjusting guide post 224 and a closer 225, and through the frictional fit between the outer peripheral wall of the closer 225 and the inner peripheral wall of the adjusting hole 13b, the mold opening sequence of the injection mold 100 is controlled. When the injection mold 100 is opened, the tooth mold slide block assembly 12 and the shoulder mold assembly 13 are separated first to release the undercut structure of the external thread teeth 203 on the neck, and then the upper mold base 1 and the lower mold base 2 are separated to obtain the formed preform, ensuring that the injection mold 100 can be opened smoothly.

[0082] The above is only the specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An injection mold, characterized in that, It includes an upper die holder and a lower die holder located below the upper die holder, and the upper die holder and the lower die holder can be separated or closed; The upper die holder is formed with a bottle shoulder groove and an injection molding runner communicating with the bottle shoulder groove; The lower die holder includes an outer mandrel assembly, an inner mandrel assembly and an elastic member. The outer mandrel assembly includes an outer mandrel for sleeving an outer bottle body. The inner mandrel assembly includes an inner mandrel for sleeving an inner bottle body. The inner mandrel is slidably arranged in the outer mandrel. The inner mandrel has an installation position extending out of the outer mandrel and an injection molding position retracted into the outer mandrel. When the inner mandrel is in the installation position, the inner bottle body can be sleeved onto the inner mandrel; when the inner mandrel is in the injection molding position, the outer bottle body, the outer mandrel, the inner bottle body and the inner mandrel jointly form a bottle shoulder convex, and the bottle shoulder groove and the bottle shoulder convex jointly enclose a bottle shoulder cavity; During the separation process of the upper die holder and the lower die holder, the elastic member pushes the inner mandrel assembly to make the inner mandrel slide to the installation position; During the closing process of the upper die holder and the lower die holder, the upper die holder presses the inner mandrel assembly to make the inner mandrel slide to the injection molding position.

2. The injection mold according to claim 1, characterized in that, The inner mandrel assembly includes an inner rod backing plate, and the lower die holder includes a base located below the inner rod backing plate. The bottom of the inner mandrel is arranged on the inner rod backing plate, and the elastic member abuts between the inner rod backing plate and the base.

3. The injection mold according to claim 2, characterized in that, The elastic member is a compression spring. An upper groove is formed at the upper end of the base, and the elastic member is embedded in the upper groove; and / or, a lower groove is formed at the lower end of the inner rod backing plate, and the elastic member is embedded in the lower groove.

4. The injection mold according to claim 2, characterized in that The outer mandrel assembly includes side plates and an outer rod backing plate located above the inner rod backing plate. The side plates connect the outer rod backing plate and the base. The bottom of the outer mandrel is arranged on the outer rod backing plate, and the inner mandrel passes through the outer rod backing plate and is sleeved in the outer mandrel.

5. The injection mold according to claim 4, characterized in that, The lower die holder includes a limiting plate located above the outer rod backing plate, and the upper end of the limiting plate abuts against the lower end of the outer bottle body.

6. The injection mold according to claim 5, characterized in that The lower die holder includes a limiting screw and a limiting nut; The limiting screw is arranged at the upper end of the outer rod backing plate. The limiting screw passes through the limiting plate, and the limiting plate can slide in the up and down direction. The limiting nut is in threaded cooperation with the limiting screw, and the limiting nut abuts against the upper and lower ends of the limiting plate respectively to fix the limiting plate at a preset height.

7. The injection mold according to claim 2, wherein At least one air outlet is formed at the position of the inner mandrel where the inner bottle body is located. At least one air inlet is formed on the inner rod backing plate. An air path flow channel is formed between the air inlet and the air outlet. High-pressure gas can enter from the air inlet and be blown from the air outlet to the inner peripheral wall of the inner bottle body through the air path flow channel.

8. The injection mold according to claim 2, characterized in that, The inner mandrel assembly includes a thimble guide post arranged at the upper end of the inner rod backing plate. During the closing process of the upper die holder and the lower die holder, the upper die holder abuts against the thimble guide post, and the thimble guide post drives the inner rod backing plate to slide downwards, so that the inner mandrel retracts from the installation position to the injection molding position.

9. The injection mold according to claim 1, characterized in that, The lower mold base includes a limit sleeve, which is arranged between the outer peripheral wall of the inner core rod and the inner peripheral wall of the outer core rod, and the upper end of the limit sleeve abuts against the lower end of the inner bottle body.

10. The injection mold according to any one of claims 1 to 9, characterized in that, The upper mold base includes: A sprue component for adding injection molding raw materials, and an injection molding runner is formed in the sprue component; A die insert moving component located below the sprue component, and a neck mold groove is formed in the die insert moving component, and the injection molding runner communicates with the neck mold groove; A shoulder mold component located below the die insert moving component, and a shoulder mold groove is formed in the shoulder mold component. The neck mold groove and the shoulder mold groove together form the bottle shoulder groove, and the die insert moving component and the shoulder mold component can be separated or closed.

11. The injection mold according to claim 10, characterized in that, The die insert moving component includes a first slider formed with a first half groove and a second slider formed with a second half groove; during the closing process of the die insert moving component and the shoulder mold component, the first slider and the second slider close together towards each other so that the first half groove and the second half groove are spliced to form the neck mold groove; during the separation process of the die insert moving component and the shoulder mold component, the first slider and the second slider separate away from each other.

12. The injection mold according to claim 11, characterized in that, The die insert moving component includes a first inclined guide pillar, a second inclined guide pillar and a slider pressing plate; Both the first slider and the second slider abut against the shoulder mold component, and the slider pressing plate is connected to the circumference of the shoulder mold component and presses on the first slider and the second slider; The first inclined guide pillar penetrates through the first slider, the second inclined guide pillar penetrates through the second slider, and the distance between the first inclined guide pillar and the second inclined guide pillar gradually increases from top to bottom; During the closing process of the die insert moving component and the shoulder mold component, the shoulder mold component drives the slider pressing plate to slide upward, the slider pressing plate pushes the first slider and the second slider to slide along the first inclined guide pillar and the second inclined guide pillar, and the first slider and the second slider close together towards each other; during the separation process of the die insert moving component and the shoulder mold component, the shoulder mold component drives the slider pressing plate to slide downward, the slider pressing plate pulls the first slider and the second slider to slide along the first inclined guide pillar and the second inclined guide pillar, and the first slider and the second slider separate away from each other.

13. The injection mold according to claim 10, characterized in that, The injection mold includes a limit sliding plate and a connecting piece located on the circumference of the upper mold base. The limit sliding plate is formed with a limit sliding groove extending in the up and down direction; One of the limit sliding plate and the connecting piece is connected to the die insert moving component, and the other of the limit sliding plate and the connecting piece is connected to the shoulder mold component. The connecting piece extends into the limit sliding groove, and the connecting piece can slide along the limit sliding groove.

14. The injection mold according to claim 10, characterized in that, The inner core rod assembly includes an adjusting guide pillar and a closer. The shoulder mold component is formed with an adjusting hole. The adjusting guide pillar is arranged in the up and down direction, the closer is arranged at the upper end of the adjusting guide pillar, the closer is inserted into the adjusting hole, and the outer peripheral wall of the closer is in frictional fit with the inner peripheral wall of the adjusting hole so that the die insert moving component and the shoulder mold component are separated first, and then the upper mold base and the lower mold base are separated.

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