Extrusion die core capable of rapidly switching small specifications

Abstract

The utility model discloses an extrusion die core capable of quickly switching small specifications, which comprises a common die sleeve, an outer shielding die sleeve sleeved on the outer conical surface of the common die sleeve, a middle die sleeved on the inner conical surface of the common die sleeve, an inner die core sleeved on the inner conical surface of the middle die, a small die core sleeved on the inner conical surface of the inner die core, a cylindrical tube arranged at one end of the small die core, and a cylindrical tube arranged at the other end of the small die core. According to the utility model, before a small-specification conductor is replaced through a large-specification conductor, the small mold core is sleeved on the end part of the small-specification conductor, and along the wiring direction of the conductor, the cylindrical tube of the small mold core is in the front and the cone is in the back, so that the small-specification conductor is not required to be replaced, and the insulation shielding cavity is reserved between the outer conical surface of the common mold sleeve and the inner conical surface of the outer shielding mold sleeve. The small die core enters the inner die core of the large-specification insulated wire core and is combined with the inner die core of the large-specification insulated wire core, so that the production of the small-specification three-layer co-extrusion insulated wire core can be quickly switched without shutdown, the time for replacing the specification of a conductor and the die replacement time are shortened, the cost is reduced, and the reliability of an extrusion layer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable production, in particular to an extrusion die core capable of quickly switching to small specifications. Background Art

[0002] In the production process of insulated wire cores of cross-linked polyethylene insulated power cables and rubber insulated power cables, a set of three-layer co-extrusion extruder heads and dies are required to extrude three different materials, conductor shielding, insulation, and insulation shielding, onto the conductor at the same time. When changing the conductor specifications, due to the different conductor diameters, even though the thickness of the extruded layer of different specifications of conductors of the same voltage level is almost the same, it is necessary to stop the machine, disassemble the head, and replace the inner, middle, and outer dies of three different specifications.

[0003] The existing technology has such shortcomings. If the product specifications are changed, the mold must be replaced, and the mold replacement requires shutdown. If the shutdown time is long, in order to prevent premature cross-linking, the screw must be removed, the residual glue in the screw and barrel must be cleaned, and the screw, head and mold must be installed. After heating, the three extruders can be started and the eccentricity can be readjusted after reaching the specified temperature. In this way, the production efficiency is low, the manufacturing cost is high, and the product quality cannot be guaranteed. Therefore, an extrusion core that can quickly switch to small specifications is needed to meet people's needs. Utility Model Content

[0004] The utility model aims to provide an extrusion die core capable of quickly switching to a small size, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an extrusion mold core that can quickly switch small specifications, including a common mold sleeve, an outer shielding mold sleeve is sleeved on the outer conical surface of the common mold sleeve, a middle mold is sleeved on the inner conical surface of the common mold sleeve, an inner mold core is sleeved on the inner conical surface of the middle mold, a small mold core is sleeved on the inner conical surface of the inner mold core, one end of the small mold core is a cylindrical tube, and the other end is a conical tube, an insulating shielding cavity is left between the outer conical surface of the common mold sleeve and the inner conical surface of the outer shielding mold sleeve, an insulating cavity is left between the inner conical surface of the common mold sleeve and the outer conical surface of the middle mold, and a conductor shielding cavity is left between the inner conical surface of the middle mold and the outer conical surface of the inner mold core.

[0006] Preferably, the outer cone surface of the small mold core has the same taper as the inner cone surface of the inner mold core.

[0007] Preferably, the outer diameter of the small mold core cylindrical tube is 0.25 mm smaller than the inner diameter of the inner mold core sizing zone.

[0008] Preferably, the inner diameter of the small mold core cylindrical tube is 0.30 mm larger than the maximum diameter of the small-size conductor to be produced, and the length of the cylindrical tube is equal to the length of the sizing zone of the inner mold core.

[0009] Preferably, the diameter of the sizing zone of the middle mold gradually decreases from the middle mold to the common mold sleeve, and the minimum diameter is larger than the diameter of the sizing zone of the inner mold core.

[0010] Preferably, the diameter of the common mold sleeve sizing zone gradually decreases from the common mold sleeve to the outer shielding mold sleeve, and the minimum diameter is greater than the minimum diameter of the middle mold sizing zone.

[0011] Preferably, the diameter of the outer shielding mold sleeve sizing zone is larger than the minimum diameter of the common mold sleeve sizing zone.

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

[0013] In the utility model, before a large-sized conductor is about to be replaced with a small-sized conductor, a small mold core is put on the end of the small-sized conductor, and along the conductor running direction, the cylindrical tube of the small mold core is in front and the cone is in the back, so that the small mold core enters the inner mold core of the large-sized insulating wire core and completes the combination, thereby realizing rapid switching to the production of small-sized three-layer co-extruded insulating wire core without stopping the machine, shortening the time for changing the conductor specification and the mold replacement time, reducing costs, and improving the reliability of the extrusion layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of an extrusion die core capable of quickly switching to a small size, proposed by the utility model;

[0015] Figure 2 This is a schematic diagram of the combined structure of an inner mold core and a small mold core that can quickly switch to a small-sized extrusion mold core proposed by the utility model;

[0016] Figure 3 The utility model provides a schematic diagram of a small mold core structure capable of quickly switching to a small-sized extrusion mold core.

[0017] In the figure: 1. Common mold sleeve; 2. Outer shielding mold sleeve; 3. Middle mold; 4. Inner mold core; 5. Small mold core; 6. Insulation shielding cavity; 7. Insulation cavity; 8. Conductor shielding cavity. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1-3A small-size extrusion die core that can be quickly switched includes a common die sleeve 1, an outer shielding die sleeve 2 is sleeved on the outer conical surface of the common die sleeve 1, a middle die 3 is sleeved on the inner conical surface of the common die sleeve 1, an inner die core 4 is sleeved on the inner conical surface of the middle die 3, a small die core 5 is sleeved on the inner conical surface of the inner die core 4, one end of the small die core 5 is a cylindrical tube, and the other end is a conical tube, an insulating shielding cavity 6 is left between the outer conical surface of the common die sleeve 1 and the inner conical surface of the outer shielding die sleeve 2, an insulating cavity 7 is left between the inner conical surface of the common die sleeve 1 and the outer conical surface of the middle die 3, and a conductor shielding cavity 8 is left between the inner conical surface of the middle die 3 and the outer conical surface of the inner die core 4.

[0020] The common die set 1 is generally fixed in the machine head. When three layers of conductors with different voltage levels or specifications are produced, the common die set 1 does not need to be replaced. The inner die core 4, the middle die 3, and the outer shielding die set 2 need to be replaced to produce conductors with different diameters and different extrusion thicknesses. Before the large-size conductor is about to be replaced with the small-size conductor, the small die core 5 is put on the end of the small-size conductor. Following the conductor routing direction, the cylindrical tube of the small die core 5 is in front and the cone is in the back, so that the small die core 5 enters the inner die core 4 of the large-size insulated wire core and completes the combination. The small-size conductor is replaced with the inner die core 4 of the large-size insulated wire core. The conductor enters the inner mold core 4 from the cylindrical tube of the small mold core 5, the conductor shielding layer is extruded from the flow channel of the machine head through the conductor shielding cavity 8, and is extruded on the small-sized conductor. The insulating material is extruded from the flow channel of the machine head through the insulating cavity 7 and is extruded on the conductor shielding layer. The insulating shielding material is extruded from the flow channel of the machine head through the insulating shielding cavity 6 and is attached to the insulating layer. From then on, three-layer co-extrusion is realized without stopping the machine, and the large-sized conductor is switched to the small-sized conductor, and the large-sized conductor mold is switched to the small-sized conductor mold.

[0021] Specifically, in this embodiment, the taper of the outer conical surface of the small mold core 5 is equal to the taper of the inner conical surface of the inner mold core 4 , so as to ensure the concentricity between the small mold core 5 and the inner mold core 4 .

[0022] Specifically, in this embodiment, the outer diameter of the cylindrical tube of the small mold core 5 is 0.25 mm smaller than the inner diameter of the sizing zone of the inner mold core 4, so that the cylindrical tube of the small mold core 5 can be smoothly inserted into the sizing zone of the inner mold core 4, and the sizing zone is represented by A.

[0023] Specifically, in this embodiment, the inner diameter of the cylindrical tube of the small mold core 5 is 0.30 mm larger than the maximum diameter of the small-sized conductor to be produced, and the length of the cylindrical tube is equal to the length of the sizing zone of the inner mold core 4, which ensures that the small-sized conductor can smoothly enter the small mold core 5 while reducing the shaking space of the small-sized conductor, preventing the small-sized conductor from shaking in the cylindrical tube and causing eccentricity of the three-layer co-extrusion.

[0024] Specifically, in this embodiment, the diameter of the sizing zone of the middle mold 3 gradually decreases from the middle mold 3 to the common mold sleeve 1, and the minimum diameter is larger than the diameter of the sizing zone of the inner mold core 4, so that the conductor shielding material can be evenly extruded on the conductor. The minimum diameter of the sizing zone of the middle mold 3 is the diameter jointly formed by the conductor and the conductor shielding layer.

[0025] Specifically, in this embodiment, the diameter of the sizing zone of the common mold sleeve 1 gradually decreases from the common mold sleeve 1 to the outer shielding mold sleeve 2, and the minimum diameter is greater than the minimum diameter of the sizing zone of the middle mold 3, so that the insulating material can be evenly extruded on the conductor shielding layer. The minimum diameter of the sizing zone of the common mold sleeve 1 is the diameter jointly formed by the conductor, the conductor shielding layer and the insulating layer.

[0026] Specifically, in this embodiment, the diameter of the sizing zone of the outer shielding mold sleeve 2 is greater than the minimum diameter of the sizing zone of the common mold sleeve 1, and the diameter of the sizing zone of the outer shielding mold sleeve 2 is the diameter formed by the conductor, the conductor shielding layer, the insulating layer and the insulating shielding layer.

[0027] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. An extrusion die core capable of rapidly switching between small sizes, comprising a common die sleeve (1), characterized in that: An outer shielding mold sleeve (2) is sleeved on the outer conical surface of the common mold sleeve (1), a middle mold (3) is sleeved on the inner conical surface of the common mold sleeve (1), an inner mold core (4) is sleeved on the inner conical surface of the middle mold (3), a small mold core (5) is sleeved on the inner conical surface of the inner mold core (4), one end of the small mold core (5) is a cylindrical tube, and the other end is a conical tube, an insulating shielding cavity (6) is reserved between the outer conical surface of the common mold sleeve (1) and the inner conical surface of the outer shielding mold sleeve (2), an insulating cavity (7) is reserved between the inner conical surface of the common mold sleeve (1) and the outer conical surface of the middle mold (3), and a conductor shielding cavity (8) is reserved between the inner conical surface of the middle mold (3) and the outer conical surface of the inner mold core (4).

2. According to claim 1, the extrusion die core capable of quickly switching to a small size is characterized in that: The outer conical surface of the small mold core (5) has the same taper as the inner conical surface of the inner mold core (4).

3. The extrusion die core capable of quickly switching to a small size according to claim 1, characterized in that: The outer diameter of the cylindrical tube of the small mold core (5) is 0.25 mm smaller than the inner diameter of the sizing zone of the inner mold core (4).

4. The extrusion die core capable of quickly switching to a small size according to claim 1, characterized in that: The inner diameter of the cylindrical tube of the small mold core (5) is 0.30 mm larger than the maximum diameter of the small-size conductor to be produced, and the length of the cylindrical tube is equal to the length of the sizing zone of the inner mold core (4).

5. The extrusion die core capable of quickly switching to a small size according to claim 1, characterized in that: The diameter of the sizing zone of the middle die (3) gradually decreases from the middle die (3) to the common die sleeve (1), and the minimum diameter is greater than the diameter of the sizing zone of the inner die core (4).

6. The extrusion die core capable of rapidly switching to a small size according to claim 1, characterized in that: The diameter of the sizing zone of the common mold sleeve (1) gradually decreases from the common mold sleeve (1) to the outer shielding mold sleeve (2), and the minimum diameter is greater than the minimum diameter of the sizing zone of the middle mold (3).

7. The extrusion die core capable of rapidly switching to a small size according to claim 1, characterized in that: The diameter of the sizing zone of the outer shielding mold sleeve (2) is greater than the minimum diameter of the sizing zone of the common mold sleeve (1).

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