Precise injection molding mold for beer barrel sealing cover based on hot runner

Abstract

The utility model provides a beer barrel sealing cover precision injection molding mould based on a hot runner, which comprises a first mould seat, a second mould seat, a mould tail seat and a mould top plate piece, the hot runner structure comprises a mounting cover, a nozzle body connecting part, a nozzle body and a nozzle core head, the mounting cover is connected with the nozzle body through the nozzle body connecting part, one end of the nozzle body and the nozzle core head are integrally formed, and the other end of the nozzle body is connected with the nozzle core head. A heating copper wire is wound on the outer surface of the nozzle body connecting part, a heat-conducting copper strip is arranged on the outer surface of the nozzle body, and the heating copper wire is in contact with the heat-conducting copper strip through a heat-conducting sheet. The heating copper wire is wound on the outer surface of the connecting part of the nozzle body, and the heat-conducting copper strip is arranged on the outer surface of the nozzle body, so that plastic of a runner and a pouring gate can be kept in a molten state, good fluidity of plastic melt is ensured, meanwhile, the runner does not need to be opened to take out condensed materials after an injection machine is shut down, raw materials are saved, and the cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a precision injection molding mold for hot runner beer barrel sealing caps. Background Technology

[0002] A beer keg sealing cap is a cap used to seal beer kegs, protecting the beer inside. These caps are injection molded. For example, the mold for manufacturing beer caps disclosed in Chinese Utility Model Patent Publication No. CN209920439U includes a mold body with an upper and lower mold plate. The upper mold plate has an injection port at its top, and a mold cavity is formed between the upper and lower mold plates. A dot-needle valve type hot nozzle is located outside the mold cavity. The injection port is connected to the dot-needle valve type hot nozzle via a drain pipe. The lower mold plate has a positioning block with several positioning holes through which positioning pins pass, all connected to the bottom of the mold cavity. This solution effectively solves the problems of reduced production efficiency and mold jamming associated with existing die-casting molds in beer cap manufacturing.

[0003] The aforementioned mold still has technical defects: when the mold injects molten material, the plastic in its runner and gate cannot remain in a molten state. Since the runner and gate are made of metal, their surface temperature is low, and they are easily cooled down, causing the temperature of the molten plastic to drop, the fluidity to deteriorate, and the quality of the sealing cap to be formed. To address this, we have designed a precision injection molding mold for beer barrel sealing caps based on hot runners. Summary of the Invention

[0004] The purpose of this invention is to provide a precision injection molding mold for hot runner beer keg sealing caps to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved through the following technical solution: a precision injection molding mold for a hot runner beer barrel sealing cap, comprising a first mold base, a second mold base, a mold tailstock, and a mold top plate. The first mold base and the second mold base are connected in a closed mold assembly. A sealing cap forming cavity is opened on one side of the second mold base. The mold top plate is threaded onto one side of the first mold base, and the mold tailstock is threaded onto the other side of the second mold base. A gate position is opened at the center of one side of the mold top plate. A hot runner structure is set inside the gate position. The hot runner structure includes a mounting cap, a nozzle body connecting part, a nozzle body, and a nozzle core head. The mounting cap is connected to the nozzle body through the nozzle body connecting part. One end of the nozzle body is integrally formed with the nozzle core head. A heating copper wire is wound around the outer surface of the nozzle body connecting part, and a heat-conducting copper strip is set on the outer surface of the nozzle body. The heating copper wire contacts the heat-conducting copper strip through a heat-conducting plate.

[0006] In the aforementioned precision injection molding mold for a hot runner beer keg sealing cap, a molding core is provided inside the molding cavity of the sealing cap. A pneumatic ejector assembly is installed at the ejector channel of the second mold base. This pneumatic ejector assembly is connected to the ejector port of the molding core. The pneumatic ejector assembly includes a hollow piston cylinder and a cylinder. A piston block push rod is provided inside the hollow piston cylinder. An ejector plug seat is installed at one end of the piston block push rod, and the ejector plug seat corresponds to the front opening of the hollow piston cylinder. The air outlet of the cylinder is connected to the tail end of the hollow piston cylinder through an interface. The purpose of this configuration is to use a pneumatic ejector assembly to pneumatically eject the molding sealing cap located inside the molding core. Since the entire mold is axially horizontally distributed, the sealing cap can be collected by falling down under the action of gravity, eliminating the need for personnel to open the mold and retrieve the material, thus greatly ensuring the efficiency of injection molding.

[0007] In the aforementioned precision injection molding mold for hot runner beer keg sealing caps, a dual-station molding core is provided inside the sealing cap molding cavity. A pneumatic ejector assembly is connected to each of the two ejector ports of the dual-station molding core. This design facilitates the simultaneous molding of two sealing caps, ensuring production progress.

[0008] In the aforementioned precision injection molding mold for hot runner beer keg sealing caps, a flow divider is embedded inside the first mold base. The bottom end of the flow divider has two valve needles, each corresponding to one of the two molding cavities of the dual-station molding core. This design allows for simultaneous material feeding by injecting molten plastic into the two molding cavities of the dual-station molding core via the flow divider and the two valve needles, ensuring the precision and quality of the injection molding process.

[0009] The aforementioned precision injection molding mold for hot runner beer keg sealing caps also includes two linear guide rails. These two linear guide rails are fixed to a second mold base and a mold tailstock. The first mold base and the mold top plate slide along the two linear guide rails via a slide block. The stroke of the first mold base along the linear guide rails is greater than twice the thickness of the sealing cap molding cavity. The purpose of this design is to allow the first mold base to slide along the two linear guide rails, enabling the first mold base and the second mold base to separate. Since the molded sealing cap is located between the first mold base and the second mold base, the molded sealing cap loses its lateral restraint. Combined with the ejection operation of the pneumatic ejector assembly, the sealing cap can be quickly separated. At the same time, after separation, precise mold closing between the first mold base and the second mold base is ensured, facilitating the injection molding of the next batch.

[0010] Compared with existing technologies, the advantages of this utility model based on a hot runner beer barrel sealing cap precision injection molding mold are as follows: By setting a hot runner structure inside the gate position, the hot runner structure includes components such as a mounting cap, a nozzle body connection, a nozzle body, and a nozzle core head. Heating copper wires are wound around the outer surface of the nozzle body connection, and a heat-conducting copper strip is set on the outer surface of the nozzle body. The heating copper wires contact the heat-conducting copper strip through heat-conducting plates. This ensures that the plastic in the runner and gate remains in a molten state, ensuring good fluidity of the molten plastic. At the same time, it eliminates the need to open the runner to remove solidified material after the injection molding machine stops, saving raw materials and reducing costs; shortening the molding cycle and improving the efficiency of the injection molding machine; by setting a pneumatic ejection assembly and two linear rails, the molded sealing cap located inside the molding core is ejected pneumatically. Since the overall mold is axially horizontally distributed, after the first mold base and the second mold base separate, the sealing cap falls down under the action of gravity for collection, eliminating the need for personnel to open the mold and remove the material, greatly ensuring the efficiency of injection molding. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural schematic diagram of the precision injection molding mold for a hot runner beer barrel sealing cap, which is based on the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of the nozzle body of the precision injection molding mold for the hot runner beer keg sealing cap of this utility model.

[0013] Figure 3 This is a schematic diagram of the planar structure of the precision injection molding mold for hot runner beer barrel sealing caps, showing the separation of the first mold base and the second mold base.

[0014] Figure 4 This is a schematic diagram of the structure of the precision injection molding mold for hot runner beer barrel sealing caps, which connects two pneumatic ejector components to a dual-station molding core.

[0015] In the diagram, 1. First mold base; 2. Second mold base; 3. Mold tailstock; 4. Mold top plate; 5. Gate position; 6. Mounting cover; 7. Linear guide rail; 8. Molding core; 9. Hollow piston cylinder; 10. Piston block ejector rod; 11. Ejector plug seat; 12. Cylinder; 13. Nozzle body connection; 14. Heating copper wire; 15. Nozzle body; 16. Heat-conducting copper strip; 17. Nozzle core head; 18. Sealing cover molding cavity; 19. Dual-station molding core; 20. Diverter seat; 21. Valve needle. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model is based on a precision injection molding mold for hot runner beer keg sealing caps;

[0018] Example 1: The molding die includes a first mold base 1, a second mold base 2, a mold tailstock 3, and a mold top plate 4. The first mold base 1 and the second mold base 2 are connected in a closed mold assembly. A sealing cover forming mold cavity 18 is opened on one side of the second mold base 2. The mold top plate 4 is installed on one side of the first mold base 1 by threads, and the mold tailstock 3 is installed on the other side of the second mold base 2 by threads. A gate position 5 is opened at the center of one side of the mold top plate 4. A hot runner structure is set inside the gate position 5. The hot runner structure includes a mounting cover 6, a nozzle body connecting part 13, a nozzle body 15, and a nozzle core head 17. The mounting cover 6 is connected to the nozzle body 15 through the nozzle body connecting part 13. One end of the nozzle body 15 is integrally formed with the nozzle core head 17. A heating copper wire 14 is wound on the outer surface of the nozzle body connecting part 13. A heat-conducting copper strip 16 is set on the outer surface of the nozzle body 15. The heating copper wire 14 contacts the heat-conducting copper strip 16 through a heat-conducting plate.

[0019] During use, the heating copper wire 14 is connected to an external power source via an electrical connector. A notch is provided on the side of the gate position 5 to facilitate connection to the external power source. When the heating copper wire 14 is energized, it can heat the nozzle body connection part 13. The heating copper wire 14 contacts the heat-conducting copper strip 16 through a heat-conducting plate, which can transfer some heat to the nozzle body 15 to heat the nozzle body 15 and ensure the fluidity of the melt.

[0020] Furthermore, in this scheme, two linear track bars 7 are set, which are fixed to the second mold base 2 and the mold tail 3. The first mold base 1 and the mold top plate 4 slide with the two linear track bars 7 through the slide block. The stroke of the first mold base 1 along the linear track bar 7 is greater than twice the thickness of the mold cavity 18 of the sealing cover forming mold cavity.

[0021] During demolding, the first mold base 1 slides along the two linear tracks 7 under the action of external force (an additional mold opening cylinder is set to connect the first mold base 1 to realize mold opening), and separates from the second mold base 2. Since the molded sealing cover is located between the first mold base 1 and the second mold base 2, the molded sealing cover loses its side limit. In addition, the ejection operation of the pneumatic ejector assembly can quickly separate the sealing cover. At the same time, after separation, it can ensure accurate mold closing of the first mold base 1 and the second mold base 2, which is convenient for the next batch of injection molding.

[0022] Example 2: The molding die includes a first mold base 1, a second mold base 2, a mold tailstock 3, and a mold top plate 4. The first mold base 1 and the second mold base 2 are connected in a closed mold assembly. A sealing cover forming mold cavity 18 is opened on one side of the second mold base 2. The mold top plate 4 is installed on one side of the first mold base 1 by threads, and the mold tailstock 3 is installed on the other side of the second mold base 2 by threads. A gate position 5 is opened at the center of one side of the mold top plate 4. A forming mold core 8 is provided inside the sealing cover forming mold cavity 18. A pneumatic ejector assembly is installed at the ejector channel of the second mold base 2. The pneumatic ejector assembly is connected to the ejector port of the forming mold core 8. The pneumatic ejector assembly includes a hollow piston cylinder 9 and a cylinder 12. A piston block ejector rod 10 is provided inside the hollow piston cylinder 9. An ejector plug seat 11 is installed at one end of the piston block ejector rod 10. The ejector plug seat 11 corresponds to the front opening of the hollow piston cylinder 9. The air outlet of the cylinder 12 is connected to the tail end of the hollow piston cylinder 9 through an interface.

[0023] Example 3, as Figure 4 As shown, as an improvement to Embodiment 2, a dual-station forming core 19 is provided inside the sealing cap forming mold cavity 18, and a pneumatic ejector assembly is connected to each of the two ejector ports of the dual-station forming core 19.

[0024] Among them, a flow divider 20 is embedded inside the first mold base 1. The bottom end of the flow divider 20 is provided with two valve needles 21, which correspond to the two forming cavities of the dual-station forming mold core 19.

[0025] Unlike Embodiment 2, in the second embodiment, the interior of the first mold base 1 can also adopt a flow divider 20, leaving the main valve needle part 21 to correspond to the forming mold core 8, while the remaining valve needle parts 21 are sealed.

[0026] Setting up a single molding core 8 or a dual-station molding core 19 is to select according to actual production needs, which can greatly ensure production efficiency and save cycle time.

[0027] In both Embodiment 2 and Embodiment 3, two linear track bars 7 are also required. The two linear track bars 7 are fixed to the second mold base 2 and the mold tail base 3, and the first mold base 1 and the mold top plate 4 slide with the two linear track bars 7 via a slide block.

[0028] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A precision injection molding mold for a hot runner beer keg sealing cap, comprising a first mold base (1), a second mold base (2), a mold tailstock (3), and a mold top plate (4), wherein the first mold base (1) and the second mold base (2) are connected in a closed mold assembly, a sealing cap forming cavity (18) is opened on one side of the second mold base (2), the mold top plate (4) is threaded onto one side of the first mold base (1), the mold tailstock (3) is threaded onto the other side of the second mold base (2), and a gate position (5) is opened at the center of one side of the mold top plate (4), characterized in that: The gate position (5) is provided with a hot runner structure. The hot runner structure includes a mounting cover (6), a nozzle body connecting part (13), a nozzle body (15), and a nozzle core head (17). The mounting cover (6) is connected to the nozzle body (15) through the nozzle body connecting part (13). One end of the nozzle body (15) is integrally formed with the nozzle core head (17). The outer surface of the nozzle body connecting part (13) is wound with a heating copper wire (14). The outer surface of the nozzle body (15) is provided with a heat-conducting copper strip (16). The heating copper wire (14) contacts the heat-conducting copper strip (16) through a heat-conducting plate.

2. The hot runner beer keg closure precision injection molding mold of claim 1, wherein, The sealing cover forming mold cavity (18) is provided with a forming mold core (8). A pneumatic ejector assembly is installed at the ejector channel of the second mold base (2). The pneumatic ejector assembly is connected to the ejector port of the forming mold core (8). The pneumatic ejector assembly includes a hollow piston cylinder (9) and a cylinder (12). A piston block push rod (10) is provided inside the hollow piston cylinder (9). An ejector plug seat (11) is installed at one end of the piston block push rod (10). The ejector plug seat (11) corresponds to the front opening of the hollow piston cylinder (9). The air outlet of the cylinder (12) is connected to the tail end of the hollow piston cylinder (9) through an interface.

3. The hot-runner beer keg closure precision injection molding mold of claim 2, wherein, The sealing cover forming mold cavity (18) is provided with a dual-station forming mold core (19), and a pneumatic ejector assembly is connected to each of the two ejector ports of the dual-station forming mold core (19).

4. The hot-runner beer keg closure precision injection molding mold of claim 3, wherein, The first mold base (1) is equipped with a flow divider (20), and the bottom end of the flow divider (20) is provided with two valve needles (21), which correspond to the two forming cavities of the dual-station forming mold core (19).

5. The hot-runner beer keg closure precision injection molding mold of claim 1, wherein, It also includes two linear rails (7), which are fixed to the second mold base (2) and the mold tail (3). The first mold base (1) and the mold top plate (4) slide with the two linear rails (7) via a slide block.

6. The hot-runner beer keg closure precision injection molding mold of claim 5, wherein, The first mold base (1) travels along the linear track (7) more than twice the thickness of the sealing cover forming mold cavity (18).

Images