Core mold of hollow machine mold head and hollow machine mold head

Abstract

The utility model discloses a core mould of a hollow machine mould head and the hollow machine mould head, the core mould comprises a conical core mould body, a positioning boss is arranged at the upper port of the conical core mould body, and a circle of convex circular ring belt capable of being shaped is arranged on the outer surface of the bottom of the conical core mould body. The outer wall of the conical core mold body is provided with the convex circular ring belt capable of being subjected to shape modification, so that the shape modification operation on the surface of the convex circular ring belt is simple, the shape modification amount is increased due to the convex circular ring belt, the repeated shape modification frequency is increased, and the rejection probability of the core mold is reduced; the core mold pressing ring is used for installing the core mold, so that the shape correction of the outer surface of the core mold and a screw installation hole have no phase angle relation, the pre-installation lineation operation before the shape correction of the core mold is canceled, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of extrusion mandrels, in particular to a mandrel of a hollow machine die head and a hollow machine die head. Background Art

[0002] In the production process of large plastic packaging containers, the molten plastic is plasticized by an extruder and then enters the die head. Through the mutual cooperation of the die and the mandrel at the die head outlet, a tube blank with a suitable wall thickness is extruded. Then, the tube blank is blown into the corresponding mold to form a product. Since the parts where the tube blank is blown to form the product are different, the stretching sizes of different parts of the tube blank are also different. If the wall thickness of the tube blank is the same, then the wall thickness of the product is no longer consistent. The position of the product corresponding to the part of the tube blank with greater stretching has a thinner wall thickness.

[0003] Generally, in order to obtain a product with a uniform wall thickness, a relatively simple method is to modify the lower edge of the mandrel so that the tube blank extruded from the part with large stretching deformation is thick, and the tube blank extruded from the part with small stretching is thin. Since the molten plastic is a viscoelastic body and is affected by various factors during the extrusion process, when modifying the mandrel, it generally requires repeated modification and testing to achieve the expected effect. If the modification is too deep, the mandrel part will be scrapped and cannot be used continuously. Due to the large size of the mandrel, the processing time is generally long, and the manufacturing cost is relatively high, which will increase the production cost. Summary of the Utility Model

[0004] Aiming at the above defects or deficiencies, the purpose of the utility model is to provide a mandrel of a hollow machine die head and a hollow machine die head.

[0005] To achieve the above object, the technical solution of the utility model is as follows:

[0006] A mandrel of a hollow machine die head, comprising: a conical mandrel body, a positioning boss is arranged at the upper port of the conical mandrel body, and a raised circular ring belt that can be modified is arranged on the outer surface of the bottom of the conical mandrel body.

[0007] An upper transition band for smooth transition is arranged at the upper end of the raised circular ring belt.

[0008] A lower transition band for smooth transition is arranged at the lower end of the raised circular ring belt.

[0009] An installation platform is arranged on the inner wall of the conical mandrel body.

[0010] A hollow machine die head, comprising: the above-mentioned mandrel, and a die that cooperates with the mandrel, and the mandrel is installed on the outlet shaft of the extrusion die head through a mandrel guide sleeve.

[0011] A core mold pressing ring is arranged in the conical core mold body of the core mold. A plurality of through holes are circumferentially arrayed on the core mold pressing ring. Screws are installed in the through holes, and the screws pass through the through holes, the core mold body and are fixed to the core mold guide sleeve.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The present utility model provides a core mold of a hollow machine die head and a hollow machine die head. By providing a raised circular ring belt that can be shaped on the outer wall of the conical core mold body, the shaping operation on the surface of the raised ring belt is simple. Since the raised ring belt increases the shaping amount, the number of repeated shaping times is increased, and the probability of core mold scrapping is reduced; the core mold is installed using a core mold pressing ring, so that there is no phase angle relationship between the shaping of the outer surface of the core mold and the screw installation holes, eliminating the pre-installation scribing operation before core mold shaping and improving work efficiency. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the core mold of the hollow machine die head of the device of the present utility model;

[0015] Figure 2 is a three-dimensional view of the core mold of the hollow machine die head of the present utility model;

[0016] Figure 3 is a schematic structural diagram of the core mold part of the hollow machine die head of the present utility model.

[0017] In the figure, 1 - conical core mold body; 2 - core mold pressing ring; 3 - die head; 4 - die head pressing ring; 5 - core mold guide sleeve; 6 - screw; 1-1 - positioning boss; 1-2 - upper transition zone; 1-3 - raised circular ring belt; 1-4 - lower transition zone; 1-5 - installation table. Detailed Embodiment

[0018] The following will describe the present utility model in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] As Figure 1 、 2 shown, the present utility model provides a core mold of a hollow machine die head, including: a conical core mold body 1. A positioning boss 1-1 is arranged at the upper port of the conical core mold body 1, and a circumferential raised circular ring belt 1-3 that can be shaped is arranged on the outer surface of the bottom of the conical core mold body 1. There is a positioning boss 1-1 around the circumference of the upper part of the conical core mold body 1, which is inserted into the core mold guide sleeve; there is a large hole in the middle of the conical core mold body 1, and all the screws pass through this hole. The conical core mold body 1 can be rotated along the axis to any position; there is a groove on the bottom surface of the hole, which cooperates with the core mold pressing ring 2.

[0020] Preferably, an upper transition zone 1-2 for smooth transition is provided at the upper end of the raised circular ring zone 1-3; a lower transition zone 1-4 for smooth transition is provided at the lower end of the raised circular ring zone 1-3. The surface of the transition zone is gently and smoothly connected to the entire conical surface. There is a raised circular ring zone 1-3 near the lower part of the conical outer surface, and the raised ring zone 1-3 is gently and smoothly connected to the entire conical surface through the upper transition zone 1-2 and the lower transition zone 1-4. When modification is required, the height of different positions of the raised circular ring zone 1-3 is trimmed according to needs, and the upper transition zone 1-2 and the lower transition zone 1-4 are kept gently and smoothly connected to the conical outer surface. The raised ring zone 1-3 increases the modification amount. When the modification depth is not mastered, the number of repeated modifications is increased, and the utilization rate of the core mold is improved; only the surface of the raised ring zone 1-3 is modified, which is convenient for operation and measurement.

[0021] Further preferably, an installation table 1-5 is provided on the inner wall of the conical core mold body 1, which is convenient for fixing and limiting the installation of the core mold pressing ring 2 when the conical core mold body 1 is installed accurately.

[0022] In addition, as Figure 3 shown, the present utility model also provides a hollow machine die head, including: the above-mentioned core mold, and a die orifice 3 that cooperates with the core mold. The core mold is installed on the outlet shaft of the extrusion die head through a core mold guide sleeve 5. The die orifice 3 is sleeved outside the core mold and fixed by a die orifice pressing ring 4. A core mold pressing ring 2 is arranged in the conical core mold body 1 of the core mold. A plurality of through holes are circumferentially arrayed in the core mold pressing ring 2, and screws 6 are installed in the through holes. The screws 6 pass through the through holes, the core mold body 1 and are fixed to the core mold guide sleeve 5.

[0023] When the present utility model is used, there is a hole in the middle of the core mold pressing ring 2, and a plurality of holes are circumferentially arrayed. The screws pass through the holes of the core mold pressing ring 2, the inner hole of the conical core mold body 1 and are connected to the core mold guide sleeve 5. After the conical core mold body 1 can be rotated along the axis to the required position, the screws are tightened to press the core mold pressing ring 2, and then the core mold 1 can be fixed. The conical core mold body 1 does not need to be pre-installed. After marking the position by scribing and then modifying, the modified conical core mold body 1 can be directly installed in place, improving the work efficiency.

[0024] For those skilled in the art, it is obvious that the above specific embodiments are only the preferred solutions of the present utility model. Therefore, the improvements and changes that some parts of the present utility model may make by those skilled in the art still embody the principle of the present utility model and achieve the purpose of the present utility model, and all belong to the scope protected by the present utility model.

Claims

1. A core mold of a hollow die head, characterized in that: include: A conical core mold body (1), wherein a positioning boss (1-1) is arranged at an upper end of the conical core mold body (1), and a raised annular belt (1-3) capable of being reshaped is arranged on the outer surface of the bottom of the conical core mold body (1).

2. The core mold of the hollow blow molding machine die head according to claim 1, characterized in that: An upper transition zone (1-2) for smooth transition is arranged at the upper end of the raised annular zone (1-3).

3. The core mold of the hollow blow molding machine die head according to claim 2, characterized in that: A lower transition zone (1-4) for smooth transition is arranged at the lower end of the raised annular zone (1-3).

4. The core mold of the hollow blow molding machine die head according to claim 1 or 2, characterized in that: The inner wall of the conical core mold body (1) is provided with a mounting platform (1-5).

5. A hollow die head, characterized in that: include: The core mold as described in any one of claims 1 to 4, and the die (3) matched with the core mold, wherein the core mold is installed on the outlet shaft of the extrusion die through a core mold guide sleeve (5).

6. The hollow forming machine die head according to claim 5, characterized in that: A core mold pressure ring (2) is arranged inside the conical core mold body (1) of the core mold, and a plurality of through holes are arranged in a circumferential array on the core mold pressure ring (2), and screws (6) are installed in the through holes. The screws (6) pass through the through holes, the core mold body (1) and the core mold guide sleeve (5) to be fixed.

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