Injection blow mold core
By designing a columnar projection and gas tank in the injection-blowing core, and using the structure connecting the air cavity, the core head is cooled during the blow molding process, solving the problem of inconvenience in cooling of the traditional core head, and improving the continuity of the injection-blowing cycle and the working reliability of the core.
Patent Information
- Application Number
- CN202421921936.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-09
AI Technical Summary
Traditional injection-blown cores cannot effectively cool the core head during blow molding, resulting in extra time cooling after demolding, which affects the injection-blowing cycle, especially when blowing thicker bottle preforms, the core head is prone to stick to materials.
A blown core is designed, by providing a columnar projection and air groove on the core body, and a connecting air cavity is arranged in the installation connection hole of the core head, and cooling of the core head is achieved by using compressed air through the air groove and air cavity.
The core head can be cooled while blow molding, reducing the cooling time after demolding, avoiding the sticking of the core head, ensuring the continuity of the injection blowing cycle and the normal operation of the core.
Smart Images
Figure CN222891630U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an injection-blowing integrated machine, in particular to an injection-blowing core in the injection-blowing integrated machine. Background Art
[0002] like Figure 1 As shown, the structure of a conventional injection blow mold core generally includes: a push rod 2, a core head 12, and a core body 11 with a central through hole 112, the core body 11 has a stepped position-limiting mounting hole 111 with a diameter larger than the central through hole 112 inwardly opened at its tail end, and a mounting connection hole 113 with a diameter larger than the central through hole 112 opened at its front end, the core head 12 is provided with a concentric columnar protruding boss 121, an annular air inlet step 115 is formed between the columnar protruding boss 121 and the core body 11, and a plurality of gas outlet steps 115 are opened along the circumferential direction on the columnar protruding boss 121 and arranged along the length direction. An air groove 1211 is arranged, a limiting pad 4 and a limiting locking nut 5 are arranged on the outer end of the push rod 2, the columnar protruding boss 121 on the core head 12 extends into the mounting and connecting hole 113 of the core body 11, and the push rod 2 is covered with a reset spring 3 and then passed through the central through hole 112 of the core body 11, and its inner end extends out from the central through hole 112 of the core body 11 and is connected to the columnar protruding boss 121, one end of the reset spring 3 abuts against the limiting pad 4 on the push rod 2, and the other end of the reset spring 3 abuts against the bottom wall of the limiting mounting hole 111 in the core body 11. In actual use, the bottle blank 91 is shaped by blowing air into it to form the bottle 92. During this process, since there is no cooling channel in the core head 11, it can only be cooled by blowing air outside after demolding, and the time cannot be long, otherwise it will affect the injection and blowing cycle. This will basically not affect the normal operation of the core when the bottle blank 91 is thin, but when the bottle blank 91 is thick, the core head 12 is prone to sticking. If the core head 12 is not cooled in time, it will affect the normal operation of the core. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide an injection-blow core which can cool the core head during blow molding.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: an injection-blow core, comprising: a push rod, a core head, and a core body with a central through hole, the core body having a limit installation hole with a diameter larger than the central through hole inwardly opened at its tail end; the core body is provided with a concentric columnar protruding boss at its head, an annular air port step is formed between the columnar protruding boss and the core body, the central through hole passes through the columnar protruding boss, a plurality of air grooves arranged along the length direction are opened on the circumferential direction of the columnar protruding boss, a corresponding end face of the core head is provided with an installation connection hole matching with the columnar protruding boss on the core body, the push rod A limiting boss is provided at the outer end, the columnar protruding boss of the core body is arranged in the mounting and connecting hole of the core head, and a connecting air cavity is provided between the columnar protruding boss of the core body and the bottom wall of the mounting and connecting hole of the core head. After the push rod is covered with the elastic reset member, it is passed through the central through hole of the core body, and its inner end extends from the central through hole of the core body, extends into the mounting and connecting hole of the core head and is connected to the core head; one end of the elastic reset member abuts against the limiting boss of the push rod, and the other end of the elastic reset member abuts against the bottom wall of the limiting mounting hole in the core body, so that the annular air port step abuts against the corresponding end face of the core head.
[0005] As a preferred embodiment, in the injection-blowing core, the columnar protruding boss is provided with a conical protrusion at its bottom, the core head is provided with a conical seating hole corresponding to the conical protrusion at the bottom of the columnar protruding boss at the edge of its mounting connection hole, and a conical air passage is provided between the conical seating hole of the core head and the conical protrusion at the bottom of the columnar protruding boss.
[0006] As a preferred embodiment, in the injection-blowing core, the specific connection method between the push rod and the core head is: the core head is provided with a connecting push rod threaded hole corresponding to the central through hole in the core body on the bottom wall of its mounting connection hole, and the inner end of the push rod is provided with a connecting threaded section corresponding to the connecting push rod threaded hole on the core head, and the connecting threaded section at the inner end of the push rod is arranged in the connecting push rod threaded hole of the core head.
[0007] As a preferred solution, in the injection-blowing core, the limiting mounting hole is a stepped hole with a small inner diameter and a large outer diameter, the inner section of the limiting mounting hole cooperates with the elastic reset part, and the outer section of the limiting mounting hole cooperates with the limiting boss on the push rod.
[0008] As a preferred embodiment, in the injection-blowing core, the limiting boss includes: a limiting pad and a limiting locking nut, and the specific arrangement is: a limiting threaded section is arranged on the outer end of the push rod, and after the limiting pad is sleeved on the outer side of the elastic reset member on the outer end of the push rod, the limiting locking nut is screwed onto its limiting threaded section.
[0009] As a preferred solution, in the injection-blowing core, the elastic return member is a return spring.
[0010] The beneficial effects of the utility model are:
[0011] 1. The utility model provides a mounting connection hole in the core head, provides a corresponding columnar protruding boss on the core body, provides an air groove on the columnar protruding boss, and provides a connecting air cavity between the columnar protruding boss of the core body and the bottom wall of the mounting connection hole of the core head. In this way, the compressed air coming from the air path between the ejector pin and the core body passes through the connecting air cavity and the air groove on the columnar protruding boss, and is then blown out from the blowing port between the core head and the core body to blow the preform in the blow molding cavity, so that the core head can be cooled while blow molding to reduce the temperature of the core head, so that there is no need to spend additional time to cool it after demoulding, thereby not affecting the injection and blowing beat (cycle); moreover, even if a thicker preform is blown, the core head will not stick to the material, thereby ensuring the normal operation of the entire core.
[0012] 2. The utility model provides a conical protrusion at the bottom of the columnar protruding boss, and provides a conical placement hole at the edge of the installation connection hole of the core head, so that a conical airway is formed between the conical placement hole of the core head and the conical protrusion at the bottom of the columnar protruding boss, thereby making the compressed air flow more smoothly in the entire air path.
[0013] 3. The utility model arranges the limit mounting hole as a stepped hole with a small inner section and a large outer section, so that the elastic reset part is located in the inner section of the limit mounting hole, so that the elastic reset part maintains a relatively straight posture, ensuring that the elastic reset part is subjected to a relatively balanced force, thereby extending the service life of the elastic reset part.
[0014] 4. The utility model adopts a limiting pad and a limiting locking nut as a limiting boss, which can greatly facilitate the installation of the ejector rod and the elastic reset member. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the injection-blowing core described in the background technology.
[0016] Figure 1 The reference numerals in the drawings are: 11, core body, 111, limiting mounting hole, 112, center through hole, 113, mounting connection hole, 115, annular air port step, 12, core head, 121, columnar protruding boss, 1211, air groove, 2, ejector rod, 3, return spring, 4, limiting pad, 5, limiting locking nut, 91, bottle blank, 92, bottle.
[0017] Figure 2 It is a structural schematic diagram of the injection-blowing core of the utility model.
[0018] Figure 2 The reference numerals in the drawings are: 11, core body, 110, columnar protruding boss, 1101, air groove, 1102, conical protrusion, 111, limit mounting hole, 112, center through hole, 114, conical air channel, 115, annular air port step, 12, core head, 120, connecting air cavity, 121, mounting connecting hole, 1211, conical placement hole, 1212, connecting push rod threaded hole, 2, push rod, 3, return spring, 4, limit pad, 5, limit locking nut, 91, bottle blank, 92, bottle. DETAILED DESCRIPTION
[0019] In conjunction with the accompanying drawings, a specific implementation scheme of an injection-blowing core of the utility model will be described in detail by taking a core of an injection-blowing plastic bottle as an example.
[0020] like Figure 2 As shown, the injection blow mold core of the utility model comprises: a push rod 2, a core head 12, a core body 11 with a central through hole 112, and a plurality of mold parts ( Figure 2 The right end of the mold core 11 is provided with a reset spring 3 as an elastic reset member and a limit pad 4 and a limit locking nut 5 as a limit protrusion. The core body 11 is provided with a limit mounting hole 111 with a diameter larger than the central through hole 112 inwardly at its tail end. The limit mounting hole 111 is a stepped hole with a small inner diameter and a large outer diameter. The inner section of the limit mounting hole 111 cooperates with the reset spring 3, and the outer section of the limit mounting hole 111 cooperates with the limit pad 4 on the push rod 2; the core body 11 is provided with a concentric (axial center line coincides) columnar protruding boss 110, and the columnar protruding boss 110 is provided with a conical protrusion 1102 at its bottom. The core head 12 is provided with a mounting connection hole 110 at its The edge of the core head 12 is provided with a conical placement hole 1211 corresponding to the conical protrusion 1102 at the bottom of the columnar protruding boss 110, a conical air channel 114 is provided between the conical placement hole 1211 of the core head 12 and the conical protrusion 1102 at the bottom of the columnar protruding boss 110, an annular air port step 115 is formed between the conical protrusion 1102 at the bottom of the columnar protruding boss 110 and the core body 11, the central through hole 112 penetrates the columnar protruding boss 110 and the conical protrusion 1102 at the bottom, a plurality of air grooves 1101 arranged along the length direction are uniformly opened on the columnar protruding boss 110 along the circumferential direction, and the corresponding end surface of the core head 12 ( Figure 2 The right side end surface of the core body 11 is provided with a mounting hole 121 which matches with the columnar protruding boss 110 on the core body 11, and the bottom wall of the mounting hole 121 is provided with a connecting push rod threaded hole 1212 which corresponds to the central through hole 112 in the core body 11. Figure 2 The left end of the core head 12 is provided with a connecting threaded section corresponding to the connecting push rod threaded hole 1212 on the core head 12, and the outer end of the push rod 2 ( Figure 2 A limiting threaded section is provided on the right end of the core body 11, the columnar protruding boss 110 of the core body 11 is arranged in the mounting and connecting hole 121 of the core head 12, and a connecting air cavity 120 is provided between the columnar protruding boss 110 of the core body 11 and the bottom wall of the mounting and connecting hole 121 of the core head 12. After the return spring 3 and the limiting pad 4 are put on the push rod 2, and the limiting locking nut 5 is put on the limiting threaded section at the outer end thereof, the push rod 2 is passed through the central through hole 112 of the core body 11, the inner end of the push rod 2 extends out from the central through hole 112 of the core body 11 and is tightened in the connecting push rod threaded hole 1212 on the core head 12. At this time, one end of the return spring 3 abuts against the bottom wall of the inner section of the limiting mounting hole 111 in the core body 11, and the other end of the return spring 3 abuts against the limiting pad 4.
[0021] The working principle of the utility model is as follows: compressed gas enters into the central through hole 112 from the limiting mounting hole 111, enters into the connecting air cavity 120 along the air passage between the push rod 2 and the inner wall of the central through hole 112, and then enters into the conical air passage 114 along the several air grooves 1101 on the columnar protruding boss 110. Under the action of air pressure, the core head 12 is pushed outward, so that the annular air port step 115 on the core body 11 is separated from the corresponding end face on the core head 12 to form a blowing port, and the compressed gas is blown into the blow molding cavity from the blowing port to blow the bottle blank 91 into the bottle 92, thereby achieving the purpose of cooling the core head 12 to reduce the temperature of the core head 12 during blow molding.
[0022] 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. An injection-blow core, comprising: A push rod, a core head and a core body with a center through hole, the core body having a limit mounting hole with a diameter larger than the center through hole inwardly opened at its tail end; it is characterized in that the core body is provided with a concentric columnar protruding boss at its head, an annular air port step is formed between the columnar protruding boss and the core body, the center through hole passes through the columnar protruding boss, a plurality of air grooves arranged along the length direction are opened on the circumferential direction of the columnar protruding boss, the core head is provided with a mounting connection hole on its corresponding end face that matches the columnar protruding boss on the core body, the outer end of the push rod is provided with a limit boss, and the core The columnar protruding boss of the core body is arranged in the mounting and connecting hole of the core head, and a connecting air cavity is arranged between the columnar protruding boss of the core body and the bottom wall of the mounting and connecting hole of the core head. The push rod is sleeved with the elastic reset part and then passed through the central through hole of the core body, and its inner end extends from the central through hole of the core body, extends into the mounting and connecting hole of the core head and is connected to the core head; one end of the elastic reset part abuts against the limiting boss of the push rod, and the other end of the elastic reset part abuts against the bottom wall of the limiting mounting hole in the core body, so that the annular air port step abuts against the corresponding end face of the core head.
2. The injection-blow core according to claim 1, characterized in that: The columnar protruding boss is provided with a conical protrusion at its bottom, and the core head is provided with a conical placement hole corresponding to the conical protrusion at the bottom of the columnar protruding boss at the edge of its installation connection hole, and a conical air passage is provided between the conical placement hole of the core head and the conical protrusion at the bottom of the columnar protruding boss.
3. The injection-blow core according to claim 1, characterized in that: The specific connection method between the push rod and the core head is: the core head is provided with a connecting push rod threaded hole corresponding to the central through hole in the core body on the bottom wall of its installation connection hole, and the inner end of the push rod is provided with a connecting threaded section corresponding to the connecting push rod threaded hole on the core head, and the connecting threaded section at the inner end of the push rod is arranged in the connecting push rod threaded hole of the core head.
4. The injection-blow core according to claim 1, characterized in that: The limiting mounting hole is a stepped hole with a small inner diameter and a large outer diameter. The inner section of the limiting mounting hole cooperates with the elastic reset member, and the outer section of the limiting mounting hole cooperates with the limiting boss on the push rod.
5. The injection-blow core according to claim 1, characterized in that: The limiting boss includes: a limiting pad and a limiting locking nut, and the specific setting method is: a limiting thread section is set on the outer end of the push rod, and the outer end of the push rod is sleeved with a limiting pad on the outside of the elastic reset member, and then the limiting locking nut is screwed on its limiting thread section.
6. An injection blow mold core according to any one of claims 1 to 5, characterized in that: The elastic reset element is a reset spring.