CN115416255B

CN115416255B - Plastic molding method and molding device

Info

Publication number: CN115416255B
Application number: CN202211366914.0A
Authority: CN
Inventors: 浦亚芹; 韩晓明; 施双武; 马腾
Original assignee: Suzhou Hanpu New Material Technology Co ltd
Current assignee: Suzhou Hanpu New Material Technology Co ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-02-17
Anticipated expiration: 2042-11-03
Also published as: CN115416255A

Abstract

The invention relates to a plastic molding method and a molding device, wherein the plastic molding device comprises an installation bottom plate, and a copper core conveying unit, a first molding unit, a second molding unit and a third molding unit which are sequentially arranged on the installation bottom plate, wherein the copper core conveying unit conveys a copper core into the first molding unit, the first molding unit is used for sequentially coating a first plastic layer and a second plastic layer outside the copper core to form a first sub-finished product, the second molding unit coats an armor layer outside the first sub-finished product to form a second sub-finished product, the third molding unit coats a flame-retardant rubber layer outside the second sub-finished product, and the flame-retardant rubber layer is filled in the second molding unit. The plastic forming device provided by the invention can form various plastics with different components, and the plastics are combined with the copper core to form a finished product made of a composite material, so that the production efficiency is accelerated, and the cost is reduced.

Description

Plastic molding method and molding device

Technical Field

The invention relates to the technical field of plastic molding, in particular to a plastic molding method and a molding device.

Background

The plastic extruding machine is an important plastic machine, the production and manufacture of most plastic products can be realized by extrusion molding, and the existing plastic extruding device can generally extrude plastic outside the wire core, so that the plastic is coated outside the wire core to form products such as cables and the like.

However in the extrusion molding to many sinle silks, often all take and carry out outside plastics parcel shaping with single sinle silk earlier to collect the back with it, rethread transposition device twists a plurality of sinle silks, again extrude plastics in the outside of the body of twisting and carry out the cladding, consequently current processing mode has greatly limited the extrusion molding of many sinle silks, and the process at the outside extrusion molding plastics of many sinle silks is comparatively loaded down with trivial details, and preparation efficiency is lower.

Disclosure of Invention

The invention provides a plastic molding method and a molding device, which aim to solve the problems in the prior art.

The technical problem solved by the invention is realized by adopting the following technical scheme:

a plastic molding device comprises an installation base plate, and a copper core feeding unit, a first molding unit, a second molding unit and a third molding unit which are sequentially arranged on the installation base plate, wherein the copper core feeding unit feeds a copper core into the first molding unit, the first molding unit is used for sequentially coating a first plastic layer and a second plastic layer outside the copper core to form a first sub-finished product, the second molding unit coats an armor layer outside the first sub-finished product to form a second sub-finished product, the third molding unit coats a flame-retardant rubber layer outside the second sub-finished product, and the second molding unit is also used for filling flame-retardant rubber in the flame-retardant rubber layer;

the first molding unit comprises a first coating assembly and a second coating assembly, the first coating assembly is arranged between the second coating assembly and the copper core conveying unit, the first coating assembly is used for coating a first plastic layer on the copper core, and the second coating assembly is used for coating a second plastic layer outside the first plastic layer; typically, the first plastic layer in the cable is a PVC plastic layer and the second plastic layer is a XLPE plastic layer.

In one embodiment, the copper core feeding unit comprises a first upright column, a first annular support and a first feeding roll, the first upright column is arranged on the mounting base plate, the first annular support is arranged at the top end of the first upright column, a mounting part is arranged on the outer wall surface of the first annular support, the mounting part comprises two mounting plates which are arranged oppositely, the first feeding roll is clamped between the two mounting plates, and the copper core is wound on the first feeding roll.

In an embodiment, the first wrapping component includes a second upright column, a second annular bracket and a first thermoplastic forming nozzle, the second upright column is arranged on the mounting base plate, the second annular bracket is arranged at the top end of the second upright column, the first thermoplastic forming nozzle is arranged on the outer wall surface of the second annular bracket, a through hole for the copper core to pass through is axially arranged on the first thermoplastic forming nozzle, and a feeding hole is arranged at the top of the first thermoplastic forming nozzle.

In one embodiment, the first coating assembly further comprises a first air-cooling nozzle similar to and coated outside the first thermoforming nozzle, and a cooling air cavity is formed between an inner wall surface of the first air-cooling nozzle and an outer wall surface of the first thermoforming nozzle.

In one embodiment, the second coating assembly comprises a third upright column, a third annular support and three groups of second feeding rolls, the third upright column is arranged on the mounting base plate, the third annular support is arranged at the top end of the third upright column, the three groups of second feeding rolls are uniformly arranged at intervals along the circumferential direction of the third annular support, and XLPE plastics are wound on the second feeding rolls; each group of second feeding rolls specifically comprises three second feeding rolls distributed around the corresponding cable, and XLPE plastic films are attached to three sides of the cable through the three second feeding rolls so as to wrap the cable.

In an embodiment, the second coating assembly further comprises a guide plate arranged at the outlet of the second feeding roll, two guide rollers are arranged at the inlet of the guide plate, and a heating plate is arranged at the outlet of the guide plate.

In an embodiment, the second molding unit includes a fourth column, a first driving motor, a first gear, a second gear, a third gear, a fourth annular bracket, a third material feeding coil, a mounting ring, and a spray ring, the fourth column is disposed on the mounting base plate, the fourth annular bracket is disposed at a top end of the fourth column, the mounting ring is fixed on the fourth column, the mounting ring is located in the fourth annular bracket and concentric with the fourth annular bracket, the first driving motor and the first gear are both disposed on the fourth column, the first gear is sleeved on an output shaft of the first driving motor, a planet carrier is disposed between the mounting ring and the fourth annular bracket, the planet carrier can freely rotate around the mounting ring, the second gear is fixed on the planet carrier and meshed with the first gear, the second gear is concentric with the fourth annular bracket, an outer wall surface of the third material feeding coil is provided with a mounting shaft, an end of the mounting shaft is inserted into the planet carrier, the third gear is sleeved on the mounting shaft, an annular gear portion is disposed on the fourth annular bracket, an inner wall surface of the annular gear is connected with the third gear, and a plurality of spray nozzles are disposed in the spray ring.

In one embodiment, the third forming unit comprises a fifth upright post, a second thermoplastic forming nozzle arranged at the top of the fifth upright post, and a second air cooling nozzle coated at the top of the second thermoplastic forming nozzle.

In an embodiment, the plastic molding device further comprises a traction unit, the traction unit comprises a sixth upright, a fifth annular support and a worm wheel support, the fifth annular support and the worm wheel support are connected to the top of the sixth upright, a plurality of worm wheels are arranged in the fifth annular support, the worm wheel support is fixed to the sixth upright, the worm wheels are installed on the worm wheel support, a worm internal thread is arranged on the inner wall surface of the fifth annular support, the worm internal thread is meshed with the worm wheels to be connected, a fourth gear is arranged on the outer end face of the fifth annular support, a second driving motor is arranged on the sixth upright, a fifth gear is sleeved on an output shaft of the second driving motor, the fifth gear is meshed with the fourth gear to be connected, a plurality of circulation areas are defined between the worm wheels, and an internally concave ring used for contacting wires is arranged in the middle of the worm wheels.

Further, the present invention also provides a plastic molding method applied to the plastic molding apparatus as described above, the plastic molding method including:

feeding the copper core into a first forming unit through a copper core feeding unit;

the first forming unit sequentially wraps the first plastic layer and the second plastic layer outside the copper core to form a first sub-finished product and sends the first sub-finished product into the second forming unit;

the second forming unit coats an armor layer on the outer part of the first finished product to form a second finished product;

and the third forming unit wraps the flame-retardant rubber layer outside the second finished product, and the flame-retardant rubber layer is filled with flame-retardant rubber by the second forming unit.

The invention has the beneficial effects that: through set gradually send copper core unit on mounting plate, first forming unit, second forming unit and third forming unit, send copper core unit to send the first forming unit with the copper core, thereby first forming unit cladding PVC plastic layer and XLPE plastic layer form first sub-finished product in proper order in the copper core outside, thereby second forming unit forms the sub-finished product at first sub-finished product's outside cladding armour layer, third forming unit is with the fire-retardant rubber layer of the outside cladding of second sub-finished product, thereby second forming unit packs fire-retardant rubber in fire-retardant rubber layer and forms the finished product. The plastic forming device provided by the invention can form various plastics with different components, and the plastics are combined with the copper core to form a finished product made of a composite material, so that the production efficiency is accelerated, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive exercise.

FIG. 1 is a schematic view of a plastic molding apparatus according to the present invention;

FIG. 2 is a schematic view of another embodiment of the plastic molding apparatus of the present invention;

FIG. 3 is a schematic view of another perspective of the plastic molding apparatus of the present invention;

FIG. 4 is a schematic partially disassembled structure of a second molding unit of the present invention;

FIG. 5 is a schematic cross-sectional view of a first air-cooled nozzle and a first thermoforming nozzle of the present invention;

FIG. 6 is a schematic cross-sectional view of a portion of a first forming unit of the present invention;

FIG. 7 is an enlarged view A of FIG. 6;

FIG. 8 is a schematic cross-sectional view of a second forming unit, a third forming unit and a drawing unit of the present invention;

fig. 9 is a perspective view of a traction unit of the present invention.

Description of reference numerals: 10. mounting a bottom plate; 20. a copper core feeding unit; 21. a first upright post; 22. a first annular stent; 23. a first material feeding roll; 24. mounting a plate; 30. a first molding unit; 40. a second molding unit; 50. a third molding unit; 60. a traction unit; 31. a first cladding component; 32. a second coating component; 311. a second upright post; 312. a second annular stent; 313. a first thermoplastic forming nozzle; 314. a first air-cooled nozzle; 315. a through hole; 316. a cold air chamber; 321. a third column; 322. a third annular scaffold; 323. a second material feeding roll; 324. a furling piece; 325. a guide plate; 326. a guide roller; 327. heating plates; 328. a third air-cooled nozzle; 41. a fourth column; 42. a first drive motor; 43. a first gear; 44. a second gear; 45. a third gear; 46. a fourth annular stent; 47. a third material feeding roll; 48. a mounting ring; 481. a row constellation; 49. spraying rings; 461. an annular gear portion; 471. installing a shaft; 491. a spray head; 51. a fifth column; 52. a second air-cooled nozzle; 53. a second thermoplastic forming nozzle; 61. a sixth column; 62. a fifth annular stent; 63. a worm gear; 64. a worm internal thread; 65. a second drive motor; 66. a fourth gear; 67. a fifth gear; 68. a worm gear bracket.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Referring to fig. 1 to 9, the present invention provides a plastic molding apparatus, which includes an installation base plate 10, and a copper core feeding unit 20, a first molding unit 30, a second molding unit 40, and a third molding unit 50 sequentially disposed on the installation base plate 10, wherein the copper core feeding unit 20 feeds a copper core into the first molding unit 30, the first molding unit 30 is configured to sequentially coat a first plastic layer and a second plastic layer on the exterior of the copper core to form a first sub-finished product, the second molding unit 40 coats an armor layer on the exterior of the first sub-finished product to form a second sub-finished product, and the third molding unit 50 coats a flame retardant rubber layer on the exterior of the second sub-finished product.

In the present embodiment, the copper core feeding unit 20, the first molding unit 30, the second molding unit 40, and the third molding unit 50 are sequentially disposed on the installation base plate 10, the copper core is fed into the first molding unit 30 by the copper core feeding unit 20, the first molding unit 30 sequentially coats a first plastic layer and a second plastic layer on the outside of the copper core to form a first sub-product, the second molding unit 40 coats an armor layer on the outside of the first sub-product to form a second sub-product, and the third molding unit 50 coats the flame retardant rubber layer on the outside of the second sub-product. The plastic forming device provided by the invention can be used for forming various plastics with different components and combining the plastics with the copper core to form a finished product (such as a cable and the like) made of a composite material, so that the production efficiency is accelerated, and the cost is reduced. Wherein, the first plastic layer is a PVC plastic layer, and the second plastic layer is an XLPE plastic layer.

Send copper core unit 20 to include first stand 21, first ring carrier 22 and first material book 23 of sending, first stand 21 is located on the mounting panel 10, first ring carrier 22 is located the top of first stand 21, be equipped with the installed part on the outer wall of first ring carrier 22, the installed part includes two mounting panels 24 that set up relatively, first material book 23 clamp of sending is in two between the mounting panel 24, the winding has the copper core on the first material book 23 of sending, under the effect of first material book 23 of sending, sends the copper core into in second forming unit 40.

The first molding unit 30 comprises a first coating component 31 and a second coating component 32, the first coating component 31 is arranged between the second coating component 32 and the copper core sending unit 20, the first coating component 31 is used for coating a PVC plastic layer on the copper core, and the second coating component 32 is used for coating an XLPE plastic layer outside the PVC plastic layer.

Specifically, the first coating component 31 includes a second column 311, a second annular support 312 and a first thermoplastic forming nozzle 313, the second column 311 is disposed on the mounting base plate 10, the second annular support 312 is disposed on the top end of the second column 311, the first thermoplastic forming nozzle 313 is disposed on the outer wall surface of the second annular support 312, a through hole 315 for the copper core to pass through is axially disposed on the first thermoplastic forming nozzle 313, and a feeding hole is disposed at the top of the first thermoplastic forming nozzle 313.

In this embodiment, the first coating assembly 31 further includes a first air-cooling nozzle 314, the first air-cooling nozzle 314 is similar to the first thermoplastic molding nozzle 313 and coats the outside of the first thermoplastic molding nozzle 313, and a cold air cavity 316 is formed between an inner wall surface of the first air-cooling nozzle 314 and an outer wall surface of the first thermoplastic molding nozzle 313.

In addition, the second wrapping component 32 includes a third upright column 321, a third ring-shaped support 322 and three sets of second material feeding rolls 323, the third upright column 321 is disposed on the installation bottom plate 10, the third ring-shaped support is disposed at the top end of the third upright column 321, three sets of the second material feeding rolls 323 are disposed along the circumferential direction of the third ring-shaped support 322 at intervals, and the second material feeding rolls 323 are wound with XLPE plastic. The second coating assembly 32 further comprises a guide plate 325 arranged at the outlet of the second material feeding roll 323, two guide rollers 326 are arranged at the inlet of the guide plate 325, and a heating plate 327 is arranged at the outlet of the guide plate 325. And, a furling member 324 is provided on the third ring support 322, and the furling member 324 is used for wrapping and furling XLPE plastic on the three second feeding rolls 323 on the outer surface of the copper core. And a heating element is provided within the furling member 324 that heats the XLPE plastic.

In this embodiment, the second forming unit 40 includes a fourth column 41, a first driving motor 42, a first gear 43, a second gear 44, a third gear 45, a fourth ring-shaped holder 46, a third feeding coil 47, a mounting ring 48 and a spraying ring 49, the fourth column 41 is disposed on the mounting base plate 10, the fourth ring-shaped holder 46 is disposed at a top end of the fourth column 41, the mounting ring 48 is fixed on the fourth column 41, the mounting ring 48 is located in the fourth ring-shaped holder 46 and is concentric with the fourth ring-shaped holder 46, the first driving motor 42 and the first gear 43 are both disposed on the fourth column 41, the first gear 43 is sleeved on an output shaft of the first driving motor 42, a planetary carrier 471 is disposed between the mounting ring 48 and the fourth ring-shaped holder 46, the planetary carrier 481 is freely rotatable around the mounting ring 48, the second gear 44 is fixed on the planetary carrier 481 and is engaged with the first gear 43, the second gear 44 is concentric with the fourth ring-shaped holder 46, an outer wall surface of the third ring-shaped holder 47 is provided with an outer wall surface of the mounting shaft 471, the mounting ring-shaped holder 45 is provided with an inner wall surface of the mounting shaft 45, and an outer wall surface of the mounting ring-shaped holder 45 is provided with a plurality of the mounting ring-shaped holders 491, and a spraying ring-shaped holder 49, the spraying ring-shaped holder 46, the mounting ring-shaped holder 46 is provided with a plurality of spraying nozzles 481 mounted on the third ring-shaped holders 49.

The third forming unit 50 comprises a fifth upright column 51, a second thermoplastic forming nozzle 53 arranged at the top of the fifth upright column 51 and a second air-cooling nozzle 52 coated at the top of the second thermoplastic forming nozzle 53;

the plastic molding device further comprises a traction unit 60, wherein the traction unit 60 comprises a sixth upright post 61, a fifth annular support 62 and a worm wheel support 68, the fifth annular support 62 is connected to the top of the sixth upright post 61, a plurality of worm wheels 63 are arranged in the fifth annular support 62, the worm wheel support 68 is fixed on the sixth upright post 61, the worm wheels 63 are all mounted on the worm wheel support 68, and a worm internal thread 64 is arranged on the inner wall surface of the fifth annular support 62; the outer end face of the fifth annular support 62 is provided with a fourth gear 66, the sixth upright post 61 is provided with a second driving motor 65, an output shaft of the second driving motor 65 is sleeved with a fifth gear 67, the fifth gear 67 is meshed with the fourth gear 66, and an area for finished products to flow is defined among the worm gears 63.

In the technical scheme of this application, PVC plastics carry first thermoplastic forming nozzle 313 through the mode of heating in, can cover one deck PVC plastic layer with the copper core surface through first thermoplastic forming nozzle 313, be equipped with first air-cooled nozzle 314 in first thermoplastic forming nozzle 313's outside simultaneously, cold wind chamber 316 has between first air-cooled nozzle 314 and the first thermoplastic forming nozzle 313, cold wind blows to the PVC plastic layer in follow cold wind chamber 316 on, can make the PVC plastic layer rapid cooling solidification after the shaping.

And meanwhile, continuously moving forwards, winding XLPE plastics on the second material conveying rolls 323, uniformly distributing three groups of second material conveying rolls 323 on a third annular support 322, wherein each group of second material conveying rolls 323 comprises three second material conveying rolls 323 arranged at 120 degrees of the circumference of the cable, and after being pulled out and guided, the XLPE plastics on the second material conveying rolls 323 are heated by a heating element, so that the joints of the three XLPE plastics can be melted and bonded together to form a circular XLPE layer and wrap the circular XLPE layer outside the PVC layer. Similarly, a third air-cooled nozzle 328 may be disposed in the forward direction to wrap the exterior of the XLPE plastic layer to cool the XLPE plastic layer.

Subsequently, the first driving motor 42 drives the second gear 44 to rotate through the first gear 43, the second gear 44 drives the row constellation 481 to rotate, the planet seat 481 rotates on the inner wall surface of the fourth annular support 46, at this time, the third gear 45 rotates along with the planet seat 481 on the inner wall surface of the fourth annular support 46, and as the third gear 45 is meshed with the annular gear part 461, the third gear 45 and the third material feeding roll 47 also rotate while revolving, so that the third material feeding roll 47 can also do circular motion around the outside of the product while releasing the metal armor layer, and the metal armor layer is coated on the outside of the first finished product. When the armor layer is coated, the spraying ring 49 in the mounting ring 48 can spray flame-retardant rubber towards the inside of the metal armor layer under the action of the outside, and the flame-retardant rubber can fill the gap of the cable. Then, the second thermoplastic forming nozzle 53 covers a layer of flame retardant rubber layer on the outside of the cable, and similarly, a second air cooling nozzle 52 is arranged on the outside of the second thermoplastic forming nozzle 53, and the second air cooling nozzle 52 can cool and solidify the flame retardant rubber layer.

The tail end of the device is provided with a traction unit 60, a second driving motor 65 drives a fifth gear 67 to drive a fourth gear 66 to rotate, the fourth gear 66 is arranged on a fifth annular bracket 62, so that the fifth annular bracket 62 can be driven to rotate, the inner wall surface of the fifth annular bracket 62 is provided with a worm internal thread 64, three worm wheels 63 are arranged in the fifth annular bracket 62, and when the fifth annular bracket 62 rotates, a circulation area defined between the three worm wheels 63 can clamp the thermoplastic molded wire to move forwards. In the embodiment, the middle of the turbine 63 is provided with an inner concave ring for contacting the wire, the teeth of the turbine 63 are positioned at two sides of the inner concave ring, and the teeth of the turbine 63 do not contact the wire in the traction process; the concave ring in the middle of the turbine 63 is in contact with the wire, the surface of the concave ring in the middle of the turbine 63 is smooth as far as possible or is provided with friction lines with proper depth on the premise that traction can be realized, and the phenomenon that the traction of the turbine 63 leaves marks on the surface of the wire is avoided.

In this application, through the plastics shaping with multiple different compositions and combine together with the copper core, make it can produce the cable of multiple different forming methods such as single copper core cable, many copper core cables, transposition copper core cable. The material forming machine is high in compatibility, can be adapted to different thermoplastic forming materials for production, and only needs to correspondingly replace the provided raw materials, so that the forming speed is high, and the production efficiency is accelerated.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The plastic molding device is characterized by comprising an installation base plate (10), and a copper core feeding unit (20), a first molding unit (30), a second molding unit (40) and a third molding unit (50) which are sequentially arranged on the installation base plate (10), wherein the copper core feeding unit (20) feeds a copper core into the first molding unit (30), the first molding unit (30) is used for sequentially coating a first plastic layer and a second plastic layer outside the copper core to form a first sub-finished product, the second molding unit (40) coats an armor layer outside the first sub-finished product to form a second sub-finished product, the third molding unit (50) coats a flame-retardant rubber layer outside the second sub-finished product, and the second molding unit (40) is further used for filling flame-retardant rubber in the flame-retardant rubber layer;

the first molding unit (30) comprises a first coating component (31) and a second coating component (32), the first coating component (31) is arranged between the second coating component (32) and the copper core conveying unit (20), the first coating component (31) is used for coating a first plastic layer on a copper core, and the second coating component (32) is used for coating a second plastic layer outside the first plastic layer;

the first coating component (31) comprises a second upright post (311), a second annular bracket (312), a first thermoplastic forming nozzle (313) and a first air cooling nozzle (314), the second upright post (311) is arranged on the mounting base plate (10), the second annular bracket (312) is arranged at the top end of the second upright post (311), the first thermoplastic forming nozzle (313) is arranged on the outer wall surface of the second annular bracket (312), a through hole (315) for a copper core to pass through is axially arranged on the first thermoplastic forming nozzle (313), and a feeding hole is formed in the top of the first thermoplastic forming nozzle (313);

the first air cooling nozzle (314) is the same as the first thermoplastic forming nozzle (313) in shape and covers the outside of the first thermoplastic forming nozzle (313), and a cold air cavity (316) is formed between the inner wall surface of the first air cooling nozzle (314) and the outer wall surface of the first thermoplastic forming nozzle (313);

the second forming unit (40) comprises a fourth upright post (41), a first driving motor (42), a first gear (43), a second gear (44), a third gear (45), a fourth annular bracket (46), a third material feeding coil (47), a mounting ring (48) and a spraying ring (49), the fourth upright post (41) is arranged on the mounting base plate (10), the fourth annular bracket (46) is arranged at the top end of the fourth upright post (41), the mounting ring (48) is fixed on the fourth upright post (41), the mounting ring (48) is positioned in the fourth annular bracket (46) and is concentric with the fourth annular bracket (46), the first driving motor (42) and the first gear (43) are both arranged on the fourth upright post (41), the first gear (43) is sleeved on an output shaft of the first driving motor (42), a material feeding constellation (481) is arranged between the mounting ring (48) and the fourth annular bracket (46), the second gear (44) is fixed on a wall surface of the second constellation bracket (44), and is engaged with the mounting shaft (47), and the second gear (481) is arranged on an end face of the fourth annular bracket (46), the third gear (45) is sleeved on the mounting shaft (471), an annular gear part (461) is arranged on the inner wall surface of the fourth annular bracket (46), the annular gear part (461) is meshed with the third gear (45) and connected with the third gear, a spray ring (49) is arranged in the mounting ring (48), and a plurality of spray heads (491) are arranged outside the spray ring (49).

2. The plastic molding device according to claim 1, wherein the copper core feeding unit (20) comprises a first upright column (21), a first ring-shaped support (22) and a first feeding roll (23), the first upright column (21) is arranged on the mounting base plate (10), the first ring-shaped support (22) is arranged at the top end of the first upright column (21), a mounting piece is arranged on the outer wall surface of the first ring-shaped support (22), the mounting piece comprises two oppositely-arranged mounting plates (24), the first feeding roll (23) is clamped between the two mounting plates (24), and a copper core is wound on the first feeding roll (23).

3. The plastic molding apparatus as claimed in claim 1, wherein the second wrapping assembly (32) comprises a third upright column (321), a third ring-shaped support (322), and three sets of second material feeding rolls (323), the third upright column (321) is disposed on the mounting base plate (10), the third ring-shaped support (322) is disposed at the top end of the third upright column (321), the three sets of second material feeding rolls (323) are uniformly spaced along the circumferential direction of the third ring-shaped support (322), and the second material feeding rolls (323) are wound with XLPE plastic.

4. A plastic molding apparatus as claimed in claim 3, wherein said second coating module (32) further comprises a guide plate (325) disposed at the outlet of said second feed roll (323), two guide rollers (326) being disposed at the inlet of said guide plate (325), and a heating plate (327) being disposed at the outlet of said guide plate (325).

5. A plastic moulding device according to any of the claims 1-4, characterized in that the third moulding unit (50) comprises a fifth upright (51), a second thermoforming nozzle (53) provided on top of the fifth upright (51) and a second air-cooling nozzle (52) covering the top of the second thermoforming nozzle (53).

6. The plastic molding device according to any one of claims 1 to 4, further comprising a traction unit (60), wherein the traction unit (60) comprises a sixth upright (61), a fifth annular support (62) and a worm wheel support (68) connected to the top of the sixth upright (61), a plurality of worm wheels (63) are arranged in the fifth annular support (62), the worm wheel support (68) is fixed on the sixth upright (61), the worm wheels (63) are mounted on the worm wheel support (68), a worm internal thread (64) is arranged on the inner wall surface of the fifth annular support (62), the worm internal thread (64) and the worm wheel (63) are connected in a meshed manner, a fourth gear (66) is arranged on the outer end surface of the fifth annular support (62), a second driving motor (65) is arranged on the sixth upright (61), a fifth gear (67) is sleeved on the output shaft of the second driving motor (65), the fifth gear (67) and the fourth gear (66) are connected in a meshed manner, a plurality of worm wheels (63) are arranged in contact areas for limiting the middle contact area of the worm wheels (63).

7. A plastic molding method applied to the plastic molding apparatus according to any one of claims 1 to 6, comprising:

feeding the copper core into a first forming unit (30) by a copper core feeding unit (20);

the first forming unit (30) wraps the first plastic layer and the second plastic layer outside the copper core in sequence to form a first sub-finished product and sends the first sub-finished product into the second forming unit (40);

a second forming unit (40) coats the armor layer outside the first sub-finished product to form a second sub-finished product;

and a third forming unit (50) coats the flame-retardant rubber layer outside the second sub-finished product, and the flame-retardant rubber is filled in the flame-retardant rubber layer by the second forming unit (40).