Search

CN-121989425-A - Multilayer coextrusion die and multilayer coextrusion extrusion equipment

CN121989425ACN 121989425 ACN121989425 ACN 121989425ACN-121989425-A

Abstract

The invention belongs to the technical field of insulated cable production, and discloses a multilayer coextrusion die and multilayer coextrusion extrusion equipment, which comprise an inner die body, an outer die sleeve, a forming die, an end cover and an end cover, wherein the inner die body is in a frustum structure with the diameter gradually reduced from a feeding end to a discharging end, at least two inner die bodies are coaxially arranged in a sleeved mode from inside to outside, a runner is arranged on the outer wall of each inner die body, the outer die sleeve is sleeved on the outer periphery of the inner die body, at least two inlets are arranged on the outer die body, the at least two inlets are communicated to the runners of the at least two inner die bodies in a one-to-one correspondence mode, the forming die is connected to the discharging end of the outer die sleeve, a forming cavity matched with the at least two runners is arranged in the outer die sleeve, the end cover is connected to the feeding end of the outer die sleeve, at least one end cover is coaxially arranged in a sleeved mode from inside to outside, the end cover comprises an external thread arranged on the outer wall and an internal thread arranged on the inner wall, adjacent end cover is in a screwed mode, and the feeding end cover is provided with a connecting thread matched with the external thread.

Inventors

  • CHEN DEGUI
  • ZHANG QINGYUAN
  • JIANG CHAO

Assignees

  • 东莞市广鼎电子科技有限公司

Dates

Publication Date
20260508
Application Date
20260306

Claims (10)

  1. 1. A multi-layer co-extrusion die, which comprises a die body, characterized by comprising the following steps: the inner die body (100) is configured into a frustum configuration with the diameter gradually reduced from a feeding end to a discharging end, at least two inner die bodies (100) are coaxially sleeved in sequence from inside to outside, and a flow channel (101) is arranged on the outer wall of each inner die body (100); The outer die sleeve (200) is sleeved on the periphery of the inner die (100), and is provided with at least two inlets (201), and the at least two inlets (201) are correspondingly communicated to the flow passages (101) of the at least two inner die (100); The forming die (300) is connected with the discharge end of the outer die sleeve (200), and a forming cavity (301) matched with at least two flow channels (101) is arranged in the forming die; The end cover (400) is connected with the feeding end of the outer die sleeve (200), at least one is coaxially arranged in a sleeved mode from inside to outside, the end cover (400) comprises an outer thread arranged on the outer wall and an inner thread arranged on the inner wall, the adjacent end covers (400) are connected through screw threads in a screwed mode, and the feeding end of the end cover (400) is provided with connecting threads matched with the outer threads, so that at least one end cover (400) is in one-to-one correspondence with the inner die (100) from inside to outside.
  2. 2. The multilayer coextrusion die according to claim 1, wherein the internal threads and the external threads of the end cap (400) are at least partially offset in the axial direction, the external threads being adjacent to the inner die body (100), the internal threads being directed away from the inner die body (100).
  3. 3. The multilayer coextrusion die according to claim 1, wherein the molding die (300) includes a die (310) and a die opening (320) provided outside the die (310), and the molding cavity (301) is formed between the die (310) and the die opening (320).
  4. 4. The multilayer coextrusion die according to claim 3, wherein at least two of the inner dies (100) comprise a central die body (110) located in the center and at least one sandwich die body (120) located between the central die body (110) and the outer die jacket (200), the die head (310) being detachably connected to a flare at the discharge end of the central die body (110).
  5. 5. The multilayer co-extrusion die as set forth in claim 1, wherein limit grooves (102) are formed in the inner walls of the inner die (100) and the outer die sleeve (200), and limit pins (103) which are matched with the limit grooves (102) to limit the radial and circumferential positions of the inner die (100) are fixed on the outer wall of the inner die (100).
  6. 6. The multilayer coextrusion die according to claim 1, wherein the runner (101) comprises an inlet runner (104) and an outlet runner (105), the inlet runner (104) is provided with a diversion protrusion (106) at a position aligned with the inlet (201), and the outlet runner (105) comprises two parts symmetrically arranged relative to the central axis of the inner die body (100), so that the discharge end of the runner (101) is configured into an annular discharge.
  7. 7. The multilayer coextrusion die according to claim 1, wherein the die opening (320) is crimped to the discharge end of the outer die sleeve (200) by a crimp sleeve (330).
  8. 8. The multilayer coextrusion die according to claim 1, wherein the forming chamber (301) comprises a flow guide portion and a forming portion, the flow guide portion is configured in a cone configuration having a diameter gradually decreasing from a feed end to a discharge end, and a cone wall thickness gradually decreasing from the feed end to the discharge end.
  9. 9. A multilayer coextrusion extrusion device, characterized in that it comprises a multilayer coextrusion die according to any of claims 1-9, a screw extruder (500) feeding the multilayer coextrusion die, and a traction mechanism (600) guiding the discharge at the discharge end of the multilayer coextrusion die; Wherein the number of the screw extruders (500) is the same as that of the inner die (100), and at least two screw extruders (500) are connected to at least two inlets (201) on the outer die sleeve (200) in one-to-one correspondence.
  10. 10. The multi-layer coextrusion apparatus according to claim 9, wherein the traction mechanism (600) comprises a traction wheel (602) provided on a mounting plate (601), and a horizontal movement device (603) and a vertical lifting device (604) for driving the mounting plate (601) to perform horizontal movement adjustment and vertical lifting adjustment, wherein the horizontal movement device (603) and the vertical lifting device (604) each comprise a screw, a screw slide, and a guide rod.

Description

Multilayer coextrusion die and multilayer coextrusion extrusion equipment Technical Field The invention belongs to the technical field of insulated cable production, and particularly relates to a multilayer coextrusion die and multilayer coextrusion equipment. Background The cable insulation extrusion die is a tool for coating an insulation layer on a metal wire, and is usually used for extruding ETFE, FEP, PFA, PEEK or PPS insulation materials after hot melting so as to cover the surface of the metal wire. In the manufacturing process of the cable, the extrusion mode of the insulating layer of the cable and the extrusion die are critical to the quality of the extrusion protection layer. The existing extrusion die mainly adopts a fixed structure, so when producing a multilayer insulated cable, two or more sets of extrusion dies are usually used for extrusion twice or more, and the process can meet the extrusion molding requirement of the multilayer insulating layer, but the extrusion for multiple times can cause poor bonding between two adjacent insulating layers, thereby causing the quality problem of easy layering of the cable. In addition, the independent arrangement of a plurality of sets of extrusion dies often also needs to be provided with a plurality of sets of extruders and traction devices which are independently installed, so that the whole production line has the problems of large occupied space, high cost and the like. Disclosure of Invention In view of the above, the present invention aims to provide a multi-layer co-extrusion die and a multi-layer co-extrusion apparatus for solving the above-mentioned problems. In order to achieve the above purpose, the present invention provides the following technical solutions: a multilayer coextrusion die comprising: the inner die body is configured into a frustum configuration with the diameter gradually reduced from a feeding end to a discharging end, at least two inner die bodies are coaxially sleeved in sequence from inside to outside, and a flow passage is arranged on the outer wall of each inner die body; The outer die sleeve is sleeved on the outer periphery of the inner die, and is provided with at least two inlets which are communicated with the flow channels of at least two inner die bodies in a one-to-one correspondence manner; The forming die is connected with the discharge end of the outer die sleeve, and a forming cavity matched with at least two flow channels is arranged in the forming die; The end cover is connected to the outer die sleeve feeding end and is sleeved with at least one coaxial sleeve from inside to outside in sequence, the end cover comprises an external thread arranged on the outer wall and an internal thread arranged on the inner wall, the adjacent end covers are connected through screw threads in a screwing mode, and the end cover feeding end is provided with connecting screw threads matched with the external screw threads, so that at least one end cover is abutted to the inner die body from inside to outside in a one-to-one mode. Preferably, along the axis direction, the internal thread and the external thread of the end cover are at least partially arranged in a dislocation manner, the external thread is close to the internal mold body, and the internal thread is away from the internal mold body. Preferably, the forming die comprises a die head and a die opening sleeved outside the die head, and the forming cavity is formed between the die head and the die opening. Preferably, the at least two inner dies comprise a central die body positioned in the center and at least one interlayer die body positioned between the central die body and the outer die sleeve, and the die heads are detachably connected to a bell mouth at the discharge end of the central die body. Preferably, the inner die body and the inner wall of the outer die sleeve are respectively provided with a limiting groove, and the outer wall of the inner die body is fixedly provided with limiting pins which are matched with the limiting grooves to limit the radial and circumferential positions of the inner die body. Preferably, the flow channel comprises an inlet flow channel and an outlet flow channel, the inlet flow channel is aligned with the inlet, a diversion protrusion is arranged at the position of the inlet, and the outlet flow channel comprises two parts symmetrically arranged relative to the central axis of the inner die, so that the discharge end of the flow channel is configured into an annular discharge. Preferably, the die orifice is pressed and connected to the discharge end of the outer die sleeve through a pressing sleeve. Preferably, the forming cavity comprises a flow guiding part and a forming part, wherein the flow guiding part is configured into a cone cylinder configuration with the diameter gradually reduced from a feeding end to a discharging end, and the thickness of the cone cylinder wall gradually reduced from the feeding end to the