Combined extrusion molding die sleeve

Abstract

The utility model provides a combined extrusion molding die sleeve, and relates to the technical field of cable dies, a first die nozzle is installed in a first through hole of a die holder, a second die nozzle is installed in an installation groove of a cover plate, and the cover plate can be installed at one end of the die holder, so that the first die nozzle and the second die nozzle can be combined together. The first through hole, the second through hole, the third through hole and the fourth through hole are sequentially communicated to form the extrusion molding channel, when the die holder is installed in a machine head of an extrusion molding machine, the extrusion molding machine can extrude heated and melted high-temperature plastic from the extrusion molding channel, and the high-temperature plastic is firstly shaped through the first die nozzle and then extruded from the second die nozzle. The first die nozzle is made of the hard alloy material, so that the first die nozzle can resist high temperature and is smooth in surface, the surface smoothness of plastic extruded to the second die nozzle can be improved, the second die nozzle is made of the polytetrafluoroethylene material, the surface of the second die nozzle has good non-stickiness, and the plastic is not prone to salivation when extruded from the second die nozzle.

Description

Technical Field

[0001] The utility model relates to the technical field of cable moulds, in particular to a combined extrusion mould sleeve. Background Art

[0002] At present, when producing cables, the cable insulation layer is mainly produced by extrusion molding. The molten insulation material is extruded onto the cable conductor by an extruder. After the insulation material is cooled, a cable insulation layer is formed on the surface of the cable conductor.

[0003] Chinese patent CN106952695A discloses an adjustment-free eccentric die device and an extrusion manufacturing process for extruding multi-core cable insulation. The die device includes a die sleeve seat and a porous die core. The porous die core is assembled in the die sleeve seat, and a gap is formed between the inner wall surface of the die sleeve seat and the outer wall surface of the porous die core. The front end of the porous die core is conical, and a die core cavity that radially decreases toward the front end surface is opened at the rear end of the die core. One end of the die core cavity extends outward, and a plurality of die core nozzles are opened at the extension portion. The die sleeve seat is installed on the head of an extruder. After the insulating material is heated by the extruder, the molten insulating material is extruded from the die sleeve seat to the die core nozzle, and extruded from the die core nozzle to the surface of the cable conductor to form an insulating layer.

[0004] However, the insulating material has strong adhesion, and in the process of extruding the molten insulating material from the mold sleeve to the mold core nozzle, the temperature of the insulating material will decrease, causing the adhesion of the insulating material to be further enhanced. The insulating material will produce varying degrees of drooling at the mold core nozzle and will adhere to the surface of the insulating layer, seriously affecting the production quality and efficiency. Utility Model Content

[0005] In view of this, the utility model proposes a combined extrusion mold sleeve to solve the problem of drooling in the process of producing a cable insulation layer using an extrusion molding method.

[0006] The technical solution of the utility model is achieved in this way:

[0007] The utility model provides a combined extrusion die sleeve, which comprises a die base, a first die mouth, a second die mouth and a cover plate;

[0008] The die base is provided with a first through hole, the first die nozzle is installed in the first through hole, and the first die nozzle is provided with a second through hole, the first through hole and the second through hole are connected, and the first die nozzle is made of cemented carbide material;

[0009] The second die nozzle is provided with a third through hole, and the second die nozzle is made of polytetrafluoroethylene material;

[0010] The cover plate is provided with an installation groove and a fourth through hole which are interconnected, the second die nozzle is installed in the installation groove, and the cover plate is installed at one end of the die base so that the first die nozzle and the second die nozzle are combined together, and the first through hole, the second through hole, the third through hole and the fourth through hole are sequentially connected to form an extrusion channel.

[0011] On the basis of the above technical solution, preferably, the first through hole includes a first conical hole segment and a first circular hole segment, the first conical hole segment shrinks toward its axis and then transitions to the first circular hole segment, and the first die nozzle is arranged in the first circular hole segment.

[0012] On the basis of the above technical solution, preferably, the second through hole includes a second conical hole segment and a second circular hole segment, the second conical hole segment shrinks toward its axis and then transitions to the second circular hole segment, and the second circular hole segment is connected to the third through hole.

[0013] On the basis of the above technical solution, preferably, the inner wall of the second tapered hole segment is flush with the inner wall of the first tapered hole segment.

[0014] On the basis of the above technical solution, preferably, the third through hole is a tapered hole, the end of the third through hole with a smaller aperture is connected to the second circular hole segment, and the end of the third through hole with a larger aperture is connected to the fourth through hole.

[0015] On the basis of the above technical solution, preferably, the fourth through hole is a tapered hole, and the end of the fourth through hole with a smaller aperture is connected to the third through hole.

[0016] On the basis of the above technical solution, preferably, a plurality of first connecting holes are provided on the end surface of the mold base facing the cover plate, and a plurality of second connecting holes are provided on the cover plate. The plurality of first connecting holes and the plurality of second connecting holes are arranged in one-to-one correspondence, and connecting pieces are inserted into the first connecting holes and the second connecting holes to fix the cover plate and the mold base.

[0017] On the basis of the above technical solution, preferably, the first through hole, the second through hole, the third through hole and the fourth through hole are coaxially arranged.

[0018] On the basis of the above technical solution, preferably, the thickness of the second die nozzle is greater than the depth of the mounting groove.

[0019] On the basis of the above technical solution, preferably, the diameter of the fourth through hole is greater than the diameter of the third through hole.

[0020] Compared with the prior art, the combined extrusion die sleeve of the utility model has the following beneficial effects:

[0021] (1) A first die mouth and a second die mouth are arranged, wherein the first die mouth is installed in the first through hole of the die base, and the second die mouth is installed in the installation groove of the cover plate, and the cover plate can be installed at one end of the die base, so that the first die mouth and the second die mouth can be combined together, and the first through hole, the second through hole, the third through hole and the fourth through hole are connected in sequence to form an extrusion channel. When the die base is installed in the head of the extruder, the extruder can extrude the high-temperature plastic melted by heat from the extrusion channel. The high-temperature plastic is first shaped by the first die mouth and then extruded from the second die mouth. The first die mouth is made of cemented carbide material, so that the first die mouth can withstand high temperatures and has a smooth surface, which can improve the surface finish of the plastic extruded to the second die mouth. The second die mouth is made of polytetrafluoroethylene material, so that the surface of the second die mouth has good non-stickiness, and the plastic is not easy to drool when it is extruded from the second die mouth;

[0022] (2) The thickness of the second die nozzle is greater than the depth of the installation groove of the cover plate, so that when the cover plate is installed on the die base, the second die nozzle will be squeezed, so that the first die nozzle and the second die nozzle will be tightly connected together. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the split structure of a combined extrusion die sleeve of the utility model;

[0025] Figure 2 This is a schematic structural diagram of a combined extrusion die sleeve of the utility model;

[0026] Figure 3 The utility model is a top view of a combined extrusion mold sleeve.

[0027] Reference numerals:

[0028] 1. Die base; 11. First through hole; 12. First connecting hole; 2. First die nozzle; 21. Second through hole; 3. Second die nozzle; 31. Third through hole; 4. Cover plate; 41. Mounting groove; 42. Fourth through hole; 43. Second connecting hole. DETAILED DESCRIPTION

[0029] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1 and Figure 2 As shown, a combined extrusion die sleeve of the utility model comprises a die base 1, a first die mouth 2, a second die mouth 3 and a cover plate 4;

[0031] The die base 1 is provided with a first through hole 11, the first die nozzle 2 is installed in the first through hole 11, and the first die nozzle 2 is provided with a second through hole 21, the first through hole 11 and the second through hole 21 are connected, and the first die nozzle 2 is made of cemented carbide material;

[0032] The second die nozzle 3 is provided with a third through hole 31, and the second die nozzle 3 is made of polytetrafluoroethylene material;

[0033] The cover plate 4 is provided with an installation groove 41 and a fourth through hole 42 which are interconnected, the second die nozzle 3 is installed in the installation groove 41, and the cover plate 4 is installed at one end of the die base 1 so that the first die nozzle 2 and the second die nozzle 3 are combined together, and the first through hole 11, the second through hole 21, the third through hole 31 and the fourth through hole 42 are sequentially connected to form an extrusion channel.

[0034] Specifically, the combined extrusion die sleeve may include a die base 1, a first die nozzle 2, a second die nozzle 3 and a cover plate 4, wherein the interior of the die base 1 may be provided with a first through hole 11, and the die base 1 is used to be installed at the head of the extruder so that the head and the first through hole 11 are connected, and the extruder can extrude the high-temperature plastic that is melted by heat into the first through hole 11.

[0035] The first die nozzle 2 can be installed in the first through hole 11, and one end face of the first die nozzle 2 is flush with one end face of the die base 1. A second through hole 21 is provided inside the first die base 1, and the second through hole 21 is connected to the first through hole 11. The plastic extruded by the extruder can be extruded from the first through hole 11 to the second through hole 21. The first die nozzle 2 is made of cemented carbide material, so that the first die nozzle 2 can be resistant to high temperature and has a smooth surface.

[0036] The second die nozzle 3 can be provided with a third through hole 31, and the second die nozzle 3 is made of polytetrafluoroethylene material, so that the surface of the second die nozzle 3 has good non-stickiness, the cover plate 4 can be provided with a mounting groove 41 and a fourth through hole 42 that are connected to each other, the second die nozzle 3 can be installed in the mounting groove 41, so that the third through hole 31 and the fourth through hole 42 are connected, the cover plate 4 can be installed on one end of the die base 1 where the first die nozzle 2 is provided, so that the first die nozzle 2 and the second die nozzle 3 can be combined together, and the first through hole 11, the second through hole 21, the third through hole 31 and the fourth through hole 42 are connected in sequence to form an extrusion channel.

[0037] When the die base 1 is loaded into the head of the extruder, the extruder can extrude the melted high-temperature plastic from the extrusion channel. To be more specific, the high-temperature plastic is first shaped by the first die mouth 2 and then extruded from the second die mouth 3. The first die mouth 2 is made of cemented carbide material, so that the first die mouth 2 can withstand high temperatures and has a smooth surface, which can improve the surface finish of the plastic extruded to the second die mouth 3. The second die mouth 3 is made of polytetrafluoroethylene material, so that the surface of the second die mouth 3 has good non-stickiness, and the plastic is not prone to drooling when it is extruded from the second die mouth 3.

[0038] like Figure 1 and Figure 2 As shown, in some embodiments, the first through hole 11 includes a first conical hole segment and a first circular hole segment, the first conical hole segment shrinks toward its axis and then transitions to the first circular hole segment, and the first die nozzle 2 is disposed in the first circular hole segment.

[0039] Specifically, the first through hole 11 may include a first conical hole segment and a first circular hole segment. The first conical hole segment shrinks toward its axis and then transitions to the first circular hole segment. To be more clear, the end of the first conical hole segment with a smaller diameter is connected to the first circular hole segment. The first die nozzle 2 can be arranged in the first circular hole segment. When the die base 1 is installed on the extruder, the high-temperature plastic that is melted by heat is squeezed from the end of the first conical hole segment with a larger diameter to the end of the first conical hole segment with a smaller diameter, which can generate a larger extrusion force to squeeze the high-temperature plastic toward the first die nozzle 2.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the second through hole 21 includes a second conical hole segment and a second circular hole segment, the second conical hole segment shrinks toward its axis and then transitions to the second circular hole segment, and the second circular hole segment is connected to the third through hole 31.

[0041] Specifically, the second through hole 21 may include a second conical hole segment and a second circular hole segment. The first conical hole segment shrinks toward its axis and then transitions to the second circular hole segment. To be more clear, the end of the second conical hole segment with a smaller diameter is connected to the second circular hole segment, and the second circular hole segment is connected to the third through hole 31. That is, when the high-temperature plastic is extruded from the first die nozzle 2 to the second die nozzle 3, it is extruded from the end of the second conical hole segment with a larger diameter to the end of the second conical hole segment with a smaller diameter, and from the end of the second conical hole segment with a smaller diameter to the second die nozzle 3, which can generate a greater extrusion force to squeeze the plastic toward the second die nozzle 3.

[0042] like Figure 1 and Figure 2 As shown, in some embodiments, the inner wall of the second tapered hole segment is flush with the inner wall of the first tapered hole segment.

[0043] Specifically, the first die nozzle 2 can be installed in the first circular hole section of the die base 1, so that the second conical hole section of the first die nozzle 2 can be directly connected to the first conical hole section of the die base 1, and the inner wall of the second conical hole section is flush with the inner wall of the first conical hole section, so that the high-temperature plastic can be squeezed toward the first die nozzle 2 along the flat channel, making extrusion more convenient.

[0044] like Figure 1 and Figure 2 As shown, in some embodiments, the third through hole 31 is a tapered hole, the end of the third through hole 31 with a smaller aperture is connected to the second circular hole segment, and the end of the third through hole 31 with a larger aperture is connected to the fourth through hole 42 .

[0045] Specifically, the third through hole 31 is a tapered hole. When the first die nozzle 2 and the second die nozzle 3 are combined together, the end with a smaller aperture of the third through hole 31 can be connected to the second circular hole segment, so that the first die nozzle 2 and the second die nozzle 3 are connected together, and the end with a larger aperture of the third through hole 31 can be connected to the first through hole 11, so that after the plastic is squeezed from the first die nozzle 2 to the second die nozzle 3, the plastic in the second die nozzle 3 can be squeezed from the end with a smaller aperture to the end with a larger aperture, which can facilitate the extrusion of the plastic from the second die nozzle 3.

[0046] like Figure 1 and Figure 2 As shown, in some embodiments, the fourth through hole 42 is a tapered hole, and the end of the fourth through hole 42 with a smaller aperture is connected to the third through hole 31 .

[0047] Specifically, the fourth through hole 42 can also be a tapered hole, and the end of the fourth through hole 42 with a smaller aperture can be connected to the third through hole 31, that is, the plastic extruded from the second die nozzle 3 can be extruded from the end of the fourth through hole 42 with a larger aperture, which can further facilitate plastic extrusion.

[0048] like Figures 1 to 3 As shown, in some embodiments, a plurality of first connecting holes 12 are provided on the end surface of the mold base 1 facing the cover plate 4, and a plurality of second connecting holes 43 are provided on the cover plate 4. The plurality of first connecting holes 12 and the plurality of second connecting holes 43 are arranged in one-to-one correspondence, and connecting pieces are inserted into the first connecting holes 12 and the second connecting holes 43 to fix the cover plate 4 and the mold base 1.

[0049] Specifically, a plurality of first connecting holes 12 may be provided on the end face of one end of the mold base 1 having the first mold nozzle 2, and a plurality of second connecting holes 43 may be provided on the cover plate 4. The plurality of first connecting holes 12 may be arranged in one-to-one correspondence with the plurality of second connecting holes 43. In the present embodiment, the first connecting holes 12 and the second connecting holes 43 are both threaded holes, and the connecting parts may be bolts, which may be inserted into the first connecting holes 12 and the second connecting holes 43, so that the cover plate 4 is fixed to the mold base 1.

[0050] Preferably, four first connecting holes 12 can be provided on the end face of the mold base 1, and the four first connecting holes 12 can be evenly distributed along the circumferential direction. Four second connecting holes 43 are also provided on the cover plate 4. The four second connecting holes 43 correspond to the four first connecting holes 12 one by one. Four connecting parts can be respectively inserted into the four first connecting holes 12 and the four second connecting holes 43. The four connecting parts can be tightened so that the cover plate 4 is installed on the mold base 1, and the plane where the cover plate 4 is located can be better adjusted by twisting the four connecting parts.

[0051] like Figure 2 As shown, in some embodiments, the first through hole 11, the second through hole 21, the third through hole 31 and the fourth through hole 42 are coaxially arranged.

[0052] Specifically, the mold base 1, the first die nozzle 2, the second die nozzle 3 and the cover plate 4 are assembled as a whole with the same axis, and the first through hole 11, the second through hole 21, the third through hole 31 and the fourth through hole 42 are coaxially arranged, so that the plastic can be better extruded from the extrusion channel.

[0053] like Figure 1 As shown, in some embodiments, the thickness of the second die nozzle 3 is greater than the depth of the mounting groove 41 .

[0054] Specifically, the thickness of the second die nozzle 3 can be greater than the depth of the mounting groove 41. To be more clear, when the second die nozzle 3 is placed in the mounting groove 41, part of the second die nozzle 3 extends out from the mounting groove 41. When the cover plate 4 is installed on the die base 1, the second die nozzle 3 will be squeezed, so that the first die nozzle 2 and the second die nozzle 3 will be tightly connected together.

[0055] like Figure 2As shown, in some embodiments, the diameter of the fourth through hole 42 is greater than the diameter of the third through hole 31 .

[0056] Specifically, the diameter of the fourth through hole 42 may be greater than the diameter of the third through hole 31 , which may facilitate extrusion of plastic from the second die nozzle 3 .

[0057] When the combined extrusion die sleeve provided by the utility model is used, the die base 1, the first die mouth 2, the second die mouth 3 and the cover plate 4 can be connected together in sequence, that is, the first die mouth 2 is first installed in the first through hole 11 of the die base 1, and the second die base 1 is installed in the installation groove 41 of the cover plate 4, and then the cover plate 4 is fixed to one end of the die base 1, so that the first die mouth 2 and the second die mouth 3 are combined together, and finally the die base 1 is installed on the head of the extruder, so that the heated and melted high-temperature plastic can be extruded from the extrusion channel.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined extrusion die set, characterized in that: It comprises a die base (1), a first die mouth (2), a second die mouth (3) and a cover plate (4); The die base (1) is provided with a first through hole (11), the first die nozzle (2) is installed in the first through hole (11), and the first die nozzle (2) is provided with a second through hole (21), the first through hole (11) and the second through hole (21) are connected, and the first die nozzle (2) is made of a hard alloy material; The second die nozzle (3) is provided with a third through hole (31), and the second die nozzle (3) is made of polytetrafluoroethylene material; The cover plate (4) is provided with a mounting groove (41) and a fourth through hole (42) which are interconnected, the second die nozzle (3) is installed in the mounting groove (41), and the cover plate (4) is installed at one end of the die base (1) so that the first die nozzle (2) and the second die nozzle (3) are combined together, and the first through hole (11), the second through hole (21), the third through hole (31) and the fourth through hole (42) are sequentially connected to form an extrusion channel.

2. The combined extrusion die set as claimed in claim 1, characterized in that: The first through hole (11) comprises a first conical hole section and a first circular hole section, the first conical hole section shrinks toward its axis and then transitions to the first circular hole section, and the first die nozzle (2) is arranged in the first circular hole section.

3. The combined extrusion die set as claimed in claim 2, characterized in that: The second through hole (21) comprises a second tapered hole segment and a second circular hole segment, the second tapered hole segment shrinks toward its axis and then transitions to the second circular hole segment, and the second circular hole segment is connected to the third through hole (31).

4. The combined extrusion die set as claimed in claim 3, characterized in that: The inner wall of the second tapered hole section is flush with the inner wall of the first tapered hole section.

5. The combined extrusion die set as claimed in claim 3, characterized in that: The third through hole (31) is a tapered hole; the end of the third through hole (31) with a smaller hole diameter is connected to the second circular hole segment; and the end of the third through hole (31) with a larger hole diameter is connected to the fourth through hole (42).

6. The combined extrusion die set as claimed in claim 5, characterized in that: The fourth through hole (42) is a tapered hole, and the end of the fourth through hole (42) with a smaller hole diameter is connected to the third through hole (31).

7. The combined extrusion die set as claimed in claim 1, characterized in that: A plurality of first connecting holes (12) are provided on the end surface of the mold base (1) facing the cover plate (4), and a plurality of second connecting holes (43) are provided on the cover plate (4). The plurality of first connecting holes (12) and the plurality of second connecting holes (43) are arranged in a one-to-one correspondence, and a connecting piece is inserted into the first connecting holes (12) and the second connecting holes (43) to fix the cover plate (4) and the mold base (1).

8. The combined extrusion die set as claimed in claim 1, characterized in that: The first through hole (11), the second through hole (21), the third through hole (31) and the fourth through hole (42) are coaxially arranged.

9. The combined extrusion die set as claimed in claim 1, characterized in that: The thickness of the second die nozzle (3) is greater than the depth of the mounting groove (41).

10. The combined extrusion die set according to claim 1, characterized in that: The diameter of the fourth through hole (42) is greater than the diameter of the third through hole (31).

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