Core-pulling injection mold

Abstract

The utility model discloses a core-pulling injection mold which comprises a fixed mold, a movable mold, a first mold core, a second mold core, a first mold core mounting seat and a second mold core mounting seat, wherein the first mold core and the second mold core are matched with a mold cavity between the fixed mold and the movable mold, the first mold core mounting seat is used for mounting the first mold core, the second mold core mounting seat is used for mounting the second mold core, and a hot runner injection nozzle is arranged in the fixed mold; the first mold core and the second mold core extend into the mold cavity from the corresponding sides of the fixed mold and the movable mold respectively, the depth of the first mold core extending into the mold cavity is larger than that of the second mold core extending into the mold cavity, stripper plates are arranged on the sides, corresponding to the first mold core, of the fixed mold and the movable mold, and through holes used for stripping and matched with the first mold core are formed in the stripper plates. And the first mold core is movably arranged in a stripping via hole in the stripping plate in a penetrating manner. The core-pulling injection mold disclosed by the utility model is mainly used for producing injection molding parts such as bottle caps.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to a core-pulling injection mold. Background Art

[0002] At present, for the core-pulling injection mold of bottle cap injection parts, the demoulding adopts the traditional longitudinal sleeve ejection method. This traditional demoulding method easily causes the product to have a small distance in the height direction, resulting in insufficient precision of the injection molded parts in the height direction. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a core-pulling injection mold which can ensure the precision of the injection molded parts in the height direction.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a core-pulling injection mold, comprising: a fixed mold and a movable mold, the fixed mold and the movable mold are respectively provided with longitudinally penetrating molding grooves on their opening and closing surfaces, when the fixed mold and the movable mold are closed, the molding grooves on the fixed mold and the movable mold form a cavity, the fixed mold is provided with a nozzle installation chamber, the bottom wall of the nozzle installation chamber is provided with an injection hole communicating with the molding groove of the fixed mold, and a hot runner nozzle is arranged in the nozzle installation chamber; the core-pulling injection mold also includes: a first core and a second core matched with the cavity, and a first core mounting seat for mounting the first core and a first core mounting seat for mounting the second core A second core mounting seat for the second core, the first core is arranged at one end of the first core mounting seat as a fixed mounting end and the other end as an injection molding end, the second core is arranged at one end of the second core mounting seat as a fixed mounting end and the other end as an injection molding end, the first core and the second core are respectively extended into the cavity from corresponding sides of the fixed and movable molds, the depth of the first core extending into the cavity is greater than the depth of the second core extending into the cavity, a stripper plate is arranged on one side of the fixed and movable molds corresponding to the first core, the stripper plate is provided with a stripper through hole matched with the first core, and the first core is movably inserted into the stripper through hole on the stripper plate.

[0005] As a preferred embodiment, in the core-pulling injection mold, the specific structure of the second core includes: a second core body and a second core core arranged in the second core body, an annular exhaust channel is arranged between the inner end of the second core core and the second core body, an external exhaust hole is axially opened on the end face of the fixed installation end of the second core core, and an exhaust connecting through hole connecting the external exhaust hole and the annular exhaust channel is opened on the second core core.

[0006] As a preferred solution, in the core-pulling injection mold, at least two exhaust connection holes connecting the external exhaust hole and the annular exhaust channel are circumferentially opened on the second core core, and all the exhaust connection holes are radially arranged.

[0007] As a preferred embodiment, in the core-pulling injection mold, the second core core and the second core body are respectively provided with mounting bosses on their fixed mounting ends, the second core body is axially provided with a stepped mounting through hole matching the second core core, and the second core mounting seat is axially provided with a stepped mounting through hole matching the second core body.

[0008] As a preferred solution, in the core-pulling injection mold, the movable mold, the first core and the second core are all provided with cooling channels, and the hot runner nozzle is arranged in the nozzle installation chamber of the fixed mold through a cooling water jacket.

[0009] As a preferred embodiment, in the core-pulling injection mold, the specific setting method of the cooling channel in the first core is: the first core is provided with a cooling hole axially on the end face of the mounting and fixing end thereof, the first core mounting base plate is provided with a cooling groove laterally communicating with the cooling hole, a cooling nozzle is provided in the cooling hole, a return water passage is formed between the cooling nozzle and the pipe wall of the cooling hole, and a cooling pipe connected to the cooling nozzle is provided in the cooling groove.

[0010] As a preferred embodiment, in the core-pulling injection mold, the cooling channel in the second core is arranged as follows: an annular cooling groove is arranged between the second core core and the second core body, and the second core mounting seat is respectively provided with a water inlet hole and a water outlet hole at both ends thereof, and the second core mounting seat is also provided with a cooling through hole connecting the water inlet hole and the water outlet hole and longitudinally passing through the second core mounting seat, and plugs are respectively arranged at both ends of the through hole of the second core mounting seat, so that the water inlet hole, the cooling through hole and the water outlet hole are connected in series with the annular cooling grooves on all the second cores to form a cooling channel in the second core.

[0011] As a preferred embodiment, in the core-pulling injection mold, the first core is provided with a mounting boss on its fixed mounting end, and the first core mounting seat comprises: a first core mounting base plate and a mounting fixing plate arranged on the first core mounting base plate, the mounting fixing plate is provided with a mounting protrusion protruding outward at one end connected to the first core mounting base plate, i.e., the inner end, a mounting hole corresponding to the mounting protrusion is provided on the first core mounting base plate, and a stepped mounting through hole penetrating the mounting fixing plate is provided axially at the inner end of the mounting fixing plate, the stepped mounting through hole comprises from the inside to the outside: a large diameter section matching the mounting boss of the first core, and a small diameter section matching the first core, the first core penetrates into the stepped mounting through hole of the mounting fixing plate from the large diameter section of the mounting fixing plate, the mounting protrusion of the mounting fixing plate is provided in the mounting hole on the first core mounting base plate, and the mounting fixing plate is fixed on the first core mounting base plate.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model changes the demoulding mode into lateral demoulding. After the first core and the second core are pulled outward for a distance in advance, the movable mold is opened, and then the first core and the second core are continuously pulled outward for a distance. During this process, the injection molded part hanging on the first core falls off the first core due to being blocked by the stripper plate, and the demoulding is completed, thereby ensuring the accuracy of the injection molded part in the height direction.

[0014] 2. The second core of the utility model adopts a split structure, which makes the arrangement of the air circuit and the water circuit therein more convenient.

[0015] 3. The utility model adopts a cooling water jacket to set the hot runner nozzle in the nozzle installation chamber of the fixed mold, so that the injection molded part in the cavity can be quickly cooled, the molding time is shortened, and the injection molding efficiency is improved.

[0016] 4. The first core mounting seat described in the utility model adopts a split structure, which makes the installation of the first core more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional structure diagram of the core-pulling injection mold of the utility model.

[0018] Figure 2 and Figure 3 It is a state diagram of the segmented mold opening of the core-pulling injection mold described in the utility model.

[0019] Figure 4 It is a schematic diagram of the installation structure of the second core.

[0020] Figure 5 yes Figure 4 AA cross-sectional structure schematic diagram.

[0021] Figures 1 to 5 The reference numerals in the figure are: 1, stripper plate, 2, first core mounting seat, 202, cooling groove, 203, cooling pipe, 20, first core mounting base plate, 21, mounting fixing plate, 210, mounting protrusion, 3, first core, 30, mounting boss, 31, cooling hole, 34, return water passage, 4, cooling nozzle, 5, fixed mold, 501, molding groove, 502, nozzle mounting chamber, 6, movable mold, 601, molding groove , 602, dynamic mold cooling channel, 7, second core mounting seat, 70, plug, 71, water inlet hole, 72, through hole, 73, water outlet hole, 8, second core, 80, second core body, 800, mounting boss, 81, second core core, 810, mounting boss, 811, external exhaust hole, 812, annular exhaust channel, 813, annular cooling groove, 9, injection molded part, 10, hot runner nozzle, 11, cooling water jacket. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1 to 5 , describe in detail a specific implementation scheme of a core-pulling injection mold described in the utility model.

[0023] like Figures 1 to 3As shown, a core-pulling injection mold described in the utility model comprises: a fixed mold 5, a movable mold 6 and a hot runner nozzle 10, the fixed mold 5 is provided with a longitudinally penetrating molding groove 501 on its opening and closing surface, and the movable mold 6 is provided with a longitudinally penetrating molding groove 601 on its opening and closing surface. When the fixed mold 5 and the movable mold 6 are molded together, the molding groove 501 on the fixed mold 5 and the molding groove 601 on the movable mold 6 form a cavity, the fixed mold 5 is provided with a nozzle installation chamber 502, and the bottom wall of the nozzle installation chamber 502 is provided with an injection hole communicating with the molding groove 501 of the fixed mold 5, and the hot runner nozzle 10 is arranged in the nozzle installation chamber 502 through a cooling water jacket 11; the core-pulling injection mold also comprises: a first core 3 and a second core 8 matched with the cavity , and a first core mounting seat 2 for mounting the first core 3 and a second core mounting seat 7 for mounting the second core 8, the first core 3 is arranged at one end of the first core mounting seat 2 as a fixed mounting end and the other end as an injection molding end, the second core 8 is arranged at one end of the second core mounting seat 7 as a fixed mounting end and the other end as an injection molding end, the first core 3 extends into the cavity from the corresponding sides of the fixed and movable molds 5 and 6 (the left side in the figure), the second core 8 extends into the cavity from the corresponding sides of the fixed and movable molds 5 and 6 (the right side in the figure), the depth of the first core 1 extending into the cavity is greater than the depth of the second core 8 extending into the cavity, so that the injection molded part formed after injection molding remains on the first core 3, and at the fixed and movable molds 5 and 6 and the first core A stripping plate 1 is provided on the side corresponding to the core 3, and a stripping hole matching the first core 3 is provided on the stripping plate 1, and the first core 3 is movably inserted into the stripping hole on the stripping plate 1; the second core 8 is a split structure, including: a second core body 80, and a second core core 81 arranged in the second core body 80, an annular exhaust channel 812 is provided between the inner end of the second core core 81 and the second core body 80, the second core core 81 is axially provided with an external exhaust hole 811 on the end face of the fixed installation end thereof, and at least two exhaust connection holes connecting the external exhaust hole 811 and the annular exhaust channel 812 and arranged radially are uniformly provided on the second core core 81 along the circumferential direction (which belongs to the conventional technology in this field) , no further description is given here); the second core core 81 is provided with a mounting boss 810 on its fixed mounting end, the second core body 80 is provided with a mounting boss 800 on its fixed mounting end, the second core body 80 is provided with a stepped mounting through hole axially arranged to match the second core core 81, the second core mounting seat 7 is provided with a stepped mounting through hole axially arranged to match the second core body 80, the second core body 80 is inserted into the stepped mounting through hole of the second core mounting seat 7 (which belongs to the conventional technology in this field and is no longer described here), and the second core core 81 is inserted into the stepped mounting through hole of the second core body 80 (which belongs to the conventional technology in this field and is no longer described here);The first core 3 is provided with a mounting boss 30 on its fixed mounting end. The specific structure of the first core mounting seat 2 includes: a first core mounting base plate 20 and a mounting fixing plate 21 arranged on the first core mounting base plate 20. The mounting fixing plate 21 is provided with a mounting protrusion 210 protruding outward at one end connected to the first core mounting base plate 20, i.e., the inner end. The first core mounting base plate 20 is provided with a mounting hole corresponding to the mounting protrusion 210. The inner end of the mounting fixing plate 21 is provided with a mounting hole that penetrates the mounting protrusion 210 in the axial direction. The stepped mounting through hole of the fixing plate 21 includes, from the inside out, a large diameter section matching with the mounting boss 30 of the first core 3, and a small diameter section matching with the first core 3. The first core 3 passes through the stepped mounting through hole of the fixing plate 21 from the large diameter section. The mounting protrusion 210 of the fixing plate 21 is arranged in the mounting hole on the first core mounting base plate 20. The fixing plate 21 is fixed on the first core mounting base plate 20 (this is a conventional technology in the field and will not be described in detail here). In this embodiment, the movable mold 6 is provided with a movable mold cooling channel 602 (which belongs to the conventional technology in this field and will not be described in detail here); the first core 3 is provided with a first core cooling channel, and the specific arrangement of the first core cooling channel is as follows: the first core 3 is provided with a cooling hole 31 along the axial direction on the end face of its mounting and fixing end, and the first core mounting base plate 20 is provided with a cooling groove 202 communicating with the cooling hole 31, and a cooling nozzle 4 is provided in the cooling hole 31, and a return water passage 34 is formed between the cooling nozzle 4 and the pipe wall of the cooling hole 31, and the return water passage 34 is connected to the cooling groove 202, and a cooling pipe 203 connected to the water inlet port of the inner end (the left end in the figure) of the cooling nozzle 4 is provided in the cooling groove 202; the second core 8 is provided with a second core cooling channel, such as; Figure 4 and Figure 5 As shown, the second core cooling channel is arranged as follows: an annular cooling groove 813 is arranged between the second core kernel 81 and the second core body 80, and the second core mounting seat 7 is respectively provided with a water inlet hole 71 and a water outlet hole 73 at both ends thereof, and the second core mounting seat 7 is also provided with a cooling through hole 72 connecting the water inlet hole 71 and the water outlet hole 73 and longitudinally penetrating the second core mounting seat 7, and plugs 70 are respectively arranged at both ends of the cooling through hole 72, so that the water inlet hole 71, the cooling through hole 72 and the water outlet hole 73 are connected in series with the annular cooling grooves 813 on the six second cores 8 to form a second core cooling channel.

[0024] In actual use, after injection molding, the first core 3 is first pulled out a distance to the left and the second core 8 is pulled out a distance to the right, and then the movable mold 6 is opened. Then, the first core 3 and the second core 8 continue to be pulled out a distance. During this process, the injection molded part 9 hanging on the first core 8 falls off the first core 3 due to the obstruction of the stripping plate 1, and the demolding is completed.

[0025] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made to the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A core-pulling injection mold, comprising: The fixed mold and the movable mold are respectively provided with longitudinally penetrating molding grooves on their opening and closing surfaces. When the fixed mold and the movable mold are closed, the molding grooves on the fixed mold and the movable mold form a cavity. The fixed mold is provided with a nozzle installation chamber, and an injection hole communicating with the molding groove of the fixed mold is provided on the bottom wall of the nozzle installation chamber. A hot runner nozzle is arranged in the nozzle installation chamber; it is characterized in that the core-pulling injection mold also includes: a first core and a second core matched with the cavity, and a first core installation seat for installing the first core and a second core installation seat for installing the second core, the first core is provided One end of the first core mounting seat is a fixed mounting end, and the other end is an injection molding end. The second core is arranged on the second core mounting seat at one end as a fixed mounting end, and the other end as an injection molding end. The first core and the second core extend into the cavity from corresponding sides of the fixed and movable molds respectively. The depth of the first core extending into the cavity is greater than the depth of the second core extending into the cavity. A stripper plate is arranged on one side of the fixed and movable molds corresponding to the first core. A stripper hole matching the first core is opened on the stripper plate, and the first core is movably inserted into the stripper hole on the stripper plate.

2. A core-pulling injection mold according to claim 1, characterized in that: The specific structure of the second core includes: a second core body and a second core core arranged in the second core body, an annular exhaust channel is arranged between the inner end of the second core core and the second core body, an external exhaust hole is axially opened on the end face of the fixed installation end of the second core core, and an exhaust connecting through hole connecting the external exhaust hole and the annular exhaust channel is opened on the second core core.

3. A core-pulling injection mold according to claim 2, characterized in that: At least two exhaust connection holes connecting the external exhaust hole and the annular exhaust channel are opened on the second core core in the circumferential direction, and all the exhaust connection holes are arranged radially.

4. A core-pulling injection mold according to claim 2, characterized in that: The second core core and the second core body are respectively provided with mounting bosses on their fixed mounting ends, the second core body is axially provided with a stepped mounting through hole matching the second core core, and the second core mounting seat is axially provided with a stepped mounting through hole matching the second core body.

5. A core-pulling injection mold according to claim 3, characterized in that: The second core core and the second core body are respectively provided with mounting bosses on their fixed mounting ends, the second core body is axially provided with a stepped mounting through hole matching the second core core, and the second core mounting seat is axially provided with a stepped mounting through hole matching the second core body.

6. A core-pulling injection mold according to claim 2, characterized in that: The movable mold, the first core and the second core are all provided with cooling channels, and the hot runner nozzle is arranged in the nozzle installation chamber of the fixed mold through a cooling water jacket.

7. A core-pulling injection mold according to claim 6, characterized in that: The specific arrangement of the cooling channel in the first core is as follows: a cooling hole is axially provided on the end face of the mounting and fixing end of the first core, a cooling groove which is transversely connected to the cooling hole is provided on the mounting bottom plate of the first core, a cooling nozzle is provided in the cooling hole, a return water passage is formed between the cooling nozzle and the pipe wall of the cooling hole, and a cooling pipe connected to the cooling nozzle is provided in the cooling groove.

8. The core-pulling injection mold according to claim 6, characterized in that: The specific arrangement of the cooling channel in the second core is as follows: an annular cooling groove is arranged between the second core core and the second core body, the second core mounting seat is respectively provided with a water inlet hole and a water outlet hole at both ends thereof, the second core mounting seat is also provided with a cooling through hole connecting the water inlet hole and the water outlet hole and longitudinally penetrating the second core mounting seat, and plugs are respectively arranged at both ends of the through hole of the second core mounting seat, so that the water inlet hole, the cooling through hole and the water outlet hole are connected in series with the annular cooling grooves on all the second cores to form a cooling channel in the second core.

9. A core-pulling injection mold according to any one of claims 1 to 8, characterized in that: The first core is provided with a mounting boss on its fixed mounting end, and the specific structure of the first core mounting seat includes: a first core mounting base plate and a mounting fixing plate arranged on the first core mounting base plate, the mounting fixing plate is provided with a mounting protrusion protruding outward at one end connected to the first core mounting base plate, i.e., the inner end, a mounting hole corresponding to the mounting protrusion is provided on the first core mounting base plate, and a stepped mounting through hole penetrating the mounting fixing plate is provided axially at the inner end of the mounting fixing plate, the stepped mounting through hole includes from the inside to the outside: a large diameter section matching the mounting boss of the first core, and a small diameter section matching the first core, the first core penetrates into the stepped mounting through hole of the mounting fixing plate from the large diameter section of the mounting fixing plate, the mounting protrusion of the mounting fixing plate is provided in the mounting hole on the first core mounting base plate, and the mounting fixing plate is fixed on the first core mounting base plate.

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