Mold core assembly, cold half mold and bottle cap mold

Abstract

A mold core assembly, a cold half mold and a bottle cap mold belong to the technical field of molds, the mold core assembly comprises a first mold core, a second mold core and a third mold core which are coaxially mounted, the second mold core is fixed in the first mold core, and a mounting position with an opening at the upper end is formed between the second mold core and the first mold core. The third mold core is mounted in the mounting position, the mold core assembly further comprises an auxiliary mechanism, and the auxiliary mechanism assists in driving or directly drives the third mold core to move up and down in the axial direction, so that the mold core assembly is switched between a mold core mold closing state and a mold core mold releasing state; it is guaranteed that the upward moving process of the third mold core is conducted smoothly, and bottle caps are formed and demolded stably, orderly and smoothly; and after the bottle cap is separated from the push plate assembly, the auxiliary mechanism drives the third mold core to move downwards to reset, and in this way, the limiting pin cannot be damaged, the limiting effect of the limiting pin is guaranteed, and therefore it is further guaranteed that the bottle cap can be stably, orderly and smoothly formed and demolded.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and in particular relates to a core component, a cold half mold and a bottle cap mold. Background Art

[0002] In order to solve the problems of complex structure and high manufacturing cost of traditional bottle cap molds, the applicant has previously developed a molding assembly, a bottle cap mold and a bottle cap molding method. As shown in the Chinese patent document with patent application number 202210911420.X, the bottle cap mold includes a core base plate, a first core, a second core and a third core; the second core is inserted into the central cavity of the first core, and the first core and the second core are directly or indirectly fixed to the core base plate; the third core is axially movably installed on the upper part of the first core and the second core, at least part of the outer wall of the third core is in contact with the first core, and at least part of the inner wall of the third core is in contact with the second core. During the bottle cap molding process, when the bottle cap mold is in the ejection and demolding stage, the bottle cap is separated from the first core and the second core, and the third core is driven upward by the bottle cap and the gas entering the installation position, thereby opening the air outlet end of the second blowing channel to assist in ejection. The upward movement of the third core needs to overcome a certain frictional resistance, which may cause the upward movement of the third core to be not smooth, which will undoubtedly affect the molding and demolding of the bottle cap;

[0003] After the bottle cap is separated from the push plate assembly, the push plate assembly moves downward to reset. During the reset process of the push plate assembly, the push plate assembly will act on the limit pin, driving the third core to move downward synchronously to reset. This reciprocating movement will cause the limit pin to wear, which may affect its limiting effect and even affect the molding and demolding of the bottle cap. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a core assembly, a cold half mold and a bottle cap mold.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A core assembly includes a first core, a second core and a third core that are coaxially installed. The second core is fixed in the first core. An installation position with an upper end opening is formed between the second core and the first core. The third core is installed in the installation position. The core assembly also includes an auxiliary mechanism. The auxiliary mechanism assists in driving or directly drives the third core to move up and down in the axial direction so that the core assembly can be switched between a core mold closing state and a core mold releasing state.

[0007] In the present invention, the auxiliary mechanism includes at least one group of electromagnetic elements, and the group of electromagnetic elements includes a first electromagnetic element fixed in the installation position and a second electromagnetic element fixed to the third core.

[0008] In the present invention, the auxiliary mechanism includes at least one linear motor, the stator of the linear motor is in the installation position, and the mover of the linear motor is fixedly connected to the third core.

[0009] In the utility model, the auxiliary mechanism includes at least one spring, one end of the spring is fixed in the installation position, and the other end of the spring is connected to the third core; when the core is in the mold closing state, the spring is in a compressed state; when the core is in the mold releasing state, the spring is in a stretched state.

[0010] In the present invention, the auxiliary mechanisms are symmetrically arranged about the central axis or evenly distributed around the central axis.

[0011] In the present invention, the bottom surface of the third core has a first installation recess. When the core is in the mold closing state, the first installation recess forms a first installation space in the installation position, and the auxiliary mechanism is arranged in the first installation space.

[0012] In the present invention, there is one spring and it is arranged around the first core; wherein, the inner wall of the third core has a second mounting recess extending through its bottom surface, and when the core is in the mold closing state, the second mounting recess forms a second mounting space in the mounting position, and the spring is arranged in the second mounting space.

[0013] Based on the core assembly provided above, the present invention further provides a cold half mold, wherein the cold half mold comprises a core bottom plate and the core assembly described above, and the core assembly is arranged on the core bottom plate.

[0014] In the present invention, the cold half mold also includes a push plate assembly, which is sleeved on the outside of the core assembly and can move up and down axially on the core bottom plate to enable the push plate assembly to switch between a push plate clamping state and a push plate demolding state; when the core assembly is in the core clamping state and the push plate assembly is in the push plate clamping state, the push plate assembly and the core assembly jointly define the opening surface of the bottle cap.

[0015] Based on the cold half mold provided above, the present invention also provides a bottle cap mold, comprising the cold half mold and the hot half mold, wherein the hot half mold defines the sealing surface of the bottle cap; when the hot half mold and the cold half mold are clamped together, a bottle cap molding cavity is formed between the hot half mold, the push plate assembly and the core assembly.

[0016] The beneficial effects of the utility model are as follows: in the ejection and demoulding stage, after the bottle cap is separated from the first core and the second core, the auxiliary mechanism, the bottle cap and the gas entering the installation position jointly drive the third core to move upward, ensuring that the upward movement of the third core is smooth, so that the bottle cap can be stably, orderly and smoothly formed and demoulded; after the bottle cap is separated from the push plate assembly, the auxiliary mechanism drives the third core to move downward and reset. In this way, the limit pin will not be damaged, and its limit effect is guaranteed, thereby further ensuring that the bottle cap can be stably, orderly and smoothly formed and demoulded. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the cold half mold in the mold closing state of this embodiment;

[0018] Figure 2 This is a schematic structural diagram of the cold half mold in the ejection and demoulding stage of this embodiment;

[0019] Figure 3 This is a schematic structural diagram of the cold half mold after the bottle cap is separated from the push plate assembly in this embodiment;

[0020] Figure 4 This is a schematic diagram of the structure of the auxiliary mechanism of this embodiment using electromagnetic elements;

[0021] Figure 5 This is a schematic diagram of the structure of the auxiliary mechanism of this embodiment using a linear motor;

[0022] Figure 6 This is a schematic diagram of the structure of the auxiliary mechanism of this embodiment using a spring;

[0023] Figure 7 This is a schematic structural diagram of the auxiliary mechanism of this embodiment including only one spring;

[0024] Figure 8 Schematic diagram of the structure of the bottle cap mold in this embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] like Figures 1 to 7 As shown, this embodiment discloses a core assembly, which includes a first core 2, a second core 3 and a third core 4. The first core 2, the second core 3 and the third core 4 are coaxially installed, the second core 3 is fixed in the first core 2, and an installation position is formed between the upper parts of the first core 2 and the second core 3. The third core 4 is installed in the installation position, and the third core 4 can move up and down axially in the installation position; an auxiliary mechanism 5 is added between the first core 2 and the third core 4, and the auxiliary mechanism 5 assists in driving or directly drives the third core 4 to move up and down axially, so that the core assembly can be converted between the core mold closing state and the core demolding state. During the ejection and demoulding stage of the core assembly, after the bottle cap 6 is separated from the first core 2 and the second core 3, the auxiliary mechanism 5, the bottle cap 6 and the gas entering the installation position jointly drive the third core 4 to move upward, ensuring that the upward movement of the third core 4 is smooth, so that the bottle cap 6 can be stably, orderly and smoothly molded and demoulded; after the bottle cap 6 is separated from the push plate assembly, the auxiliary mechanism 5 drives the third core 4 to move downward and reset. In this way, the limit pin will not be damaged, and its limiting effect is guaranteed, thereby further ensuring that the bottle cap 6 can be stably, orderly and smoothly molded and demoulded.

[0029] As a preferred embodiment, the auxiliary mechanism 5 includes at least one group of electromagnetic elements, one group of electromagnetic elements includes a first electromagnetic element 51 fixed to the installation position and a second electromagnetic element 52 fixed to the third core 4; in the ejection and demolding stage, after the bottle cap 6 is separated from the first core 2 and the second core 3, the first electromagnetic element 51 and the second electromagnetic element 52 are energized and generate mutually repulsive magnetic forces, and the third core 4 is driven upward by the mutually repulsive magnetic forces, the bottle cap 6 and the gas entering the installation position; after the bottle cap 6 is separated from the push plate assembly, the first electromagnetic element 51 and the second electromagnetic element 52 are energized and generate mutually attractive magnetic forces, and the mutually attractive magnetic forces drive the third core 4 to move downward and reset.

[0030] As another preferred embodiment, the auxiliary mechanism 5 includes at least one linear motor 53, the stator of the linear motor 53 is fixed at the installation position, and the mover of the linear motor 53 is fixedly connected to the third core 4; in the ejection and demolding stage, after the bottle cap 6 is separated from the first core 2 and the second core 3, the linear motor 53, the bottle cap 6 and the gas entering the installation position jointly drive the third core 4 to move upward; after the bottle cap 6 is separated from the push plate assembly, the linear motor 53 drives the third core 4 to move downward and reset.

[0031] As another preferred embodiment, the auxiliary mechanism 5 includes at least one spring 54, one end of which is fixed in the installation position and the other end of which is connected to the third core 4. When the cores are in the mold-clamped state, the spring 54 is in a slightly compressed state. During the ejection and demolding stage, after the bottle cap 6 is separated from the first core 2 and the second core 3, the elastic restoring force of the spring 54, the bottle cap 6, and the gas entering the installation position jointly drive the third core 4 to move upward. As the third core 4 continues to move upward, the spring 54 is in a stretched state. At this time, the elastic restoring force of the spring 54 and the force of the gas entering the installation position offset each other, and thus the third core 4 is temporarily not driven to move downward and reset. When the bottle cap 6 is separated from the push plate assembly, ventilation stops, and the elastic restoring force of the spring 54 drives the third core 4 to move downward and reset. When the cores are demolded, the spring 54 is in a stretched state.

[0032] In this embodiment, in order to improve the balance and stability of the movement of the third core 4, the components of the auxiliary mechanism 5 are symmetrically arranged about the central axis or evenly distributed around the central axis. The components of the auxiliary mechanism 5 are electromagnetic components, linear motors 53 or springs 54.

[0033] In this embodiment, the bottom surface of the third core 4 has at least one first mounting recess. When the core is in the mold closing state, the first mounting recess forms a first mounting space in the mounting position. The auxiliary mechanism 5 is arranged in the first mounting space, and the number of first mounting recesses is equal to the number of elements in the auxiliary mechanism 5.

[0034] In this embodiment, when the auxiliary mechanism 5 includes only one spring 54, the following design can be adopted. The inner wall of the third core 4 has a second mounting recess extending through its bottom surface. When the core is in the mold closing state, the second mounting recess forms a second mounting space in the mounting position, and the spring 54 surrounds the first core 2 and is located in the second mounting space.

[0035] Based on the core assembly disclosed above, this embodiment also discloses a cold half mold, including a core base plate 1 and a core assembly as described above, and the core assembly is arranged on the core base plate 1. The cold half mold also includes a push plate assembly, which is sleeved on the outside of the core assembly and can move up and down axially on the core base plate 1 so that the push plate assembly can be switched between a push plate mold closing state and a push plate demoulding state. When the core assembly is in the core mold closing state and the push plate assembly is in the push plate mold closing state, the push plate assembly and the core assembly jointly define the opening surface of the bottle cap. The push plate assembly includes a push plate 7 and a push sleeve 8, and the push sleeve 8 at least defines a partial annular surface of the open end of the bottle cap 6. The push sleeve 8 is fixedly mounted on the push plate 7, and the push sleeve 8 is sleeved on the outer periphery of the first core 2. The detailed structure and specific working principle of the push plate assembly can be referred to the prior art and will not be described in detail here.

[0036] like Figure 8 As shown, based on the cold mold half disclosed above, this embodiment further discloses a bottle cap mold, comprising the aforementioned cold mold half and a hot mold half. The hot mold half defines the sealing surface of the bottle cap. When the hot mold half and the cold mold half are joined, a bottle cap molding cavity is formed between the hot mold half, the push plate assembly, and the core assembly. The hot mold half comprises a hot mold cavity plate 9, a hot mold cavity 10, and a hot mold insert 11. The hot mold cavity 10 and the hot mold insert 11 are coaxially mounted in the hot mold cavity plate 9 from the outside to the inside.

[0037] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the scope of protection of the present invention.

Claims

1. A core assembly comprising a first core, a second core, and a third core coaxially mounted, wherein the second core is fixed within the first core, and an installation position with an upper end open is formed between the second core and the first core, and the third core is installed in the installation position, characterized in that: The core assembly further comprises an auxiliary mechanism, which assists in driving or directly drives the third core to move up and down in the axial direction, so that the core assembly can be switched between a core mold closing state and a core mold releasing state.

2. A core assembly according to claim 1, characterized in that: The auxiliary mechanism includes at least one set of electromagnetic elements, wherein the set of electromagnetic elements includes a first electromagnetic element fixed in the installation position and a second electromagnetic element fixed to the third core.

3. A core assembly according to claim 1, characterized in that: The auxiliary mechanism includes at least one linear motor, the stator of the linear motor is in the installation position, and the mover of the linear motor is fixedly connected to the third core.

4. A core assembly according to claim 1, characterized in that: The auxiliary mechanism includes at least one spring, one end of the spring is fixed in the installation position, and the other end of the spring is connected to the third core; When the core is in a closed mold state, the spring is in a compressed state; When the core is demoulded, the spring is in a stretched state.

5. A core assembly according to any one of claims 2 to 4, characterized in that: The auxiliary mechanisms are symmetrically arranged about the central axis or evenly distributed around the central axis.

6. A core assembly according to any one of claims 2 to 4, characterized in that: The bottom surface of the third core has a first installation recess. When the core is in a mold-clamped state, the first installation recess forms a first installation space in the installation position. The auxiliary mechanism is arranged in the first installation space.

7. A core assembly according to claim 4, characterized in that: There is one spring and it is arranged around the first core; wherein, the inner wall of the third core has a second mounting recess extending through its bottom surface, and when the core is in the mold closing state, the second mounting recess forms a second mounting space in the mounting position, and the spring is arranged in the second mounting space.

8. A cold half mold, characterized in that: The invention comprises a core base plate and a core assembly according to any one of claims 1 to 7, wherein the core assembly is arranged on the core base plate.

9. A cold half mold according to claim 8, characterized in that: The cold half mold further includes a push plate assembly, which is sleeved on the outside of the core assembly and can move up and down along the axial direction on the core bottom plate to switch the push plate assembly between a push plate mold closing state and a push plate mold releasing state; When the core assembly is in the core mold closing state and the push plate assembly is in the push plate mold closing state, the push plate assembly and the core assembly jointly define the opening surface of the bottle cap.

10. A bottle cap mold comprising the cold mold half and a hot mold half as claimed in claim 9, wherein the hot mold half defines a sealing surface of the bottle cap; When the hot half mold is clamped with the cold half mold, a bottle cap molding cavity is formed between the hot half mold, the push plate assembly and the core assembly.

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