CN112356422A

CN112356422A - Extrusion system and method for cable insulation layer

Info

Publication number: CN112356422A
Application number: CN202110045358.6A
Authority: CN
Inventors: 付艇; 李鹏鹏
Original assignee: Jiangxi Pacific Cable Group Co ltd
Current assignee: Jiangxi Pacific Cable Group Co ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-02-12
Anticipated expiration: 2041-01-13
Also published as: CN112356422B

Abstract

The invention discloses an extrusion system of a cable insulation layer, which comprises an extruder and an extrusion die head, wherein the rear end of the extruder is provided with a first motor, and the front end of the extruder is provided with a connecting pipe. The extrusion die head comprises a housing, an extrusion member, a covering member and a molding member, wherein the extrusion member is arranged in the housing. The cladding piece is provided with a mounting part, a storage tank and a first fixing part. The extruder is provided with a discharging hopper. The invention also discloses an extrusion method of the cable insulation layer. This cable insulation's extrusion system simple structure, design benefit can extrude the insulating layer raw materials of melting through the extruder, then the insulating layer raw materials is attached to the copper core to the cooperation of rethread extrusion piece and cladding piece for the cladding is more stable. And the surface of the insulating layer is smoothed by the forming part after coating, so that the surface of the cable is more smooth.

Description

Extrusion system and method for cable insulation layer

Technical Field

The invention relates to the technical field of cable manufacturing, in particular to a system and a method for extruding a cable insulating layer.

Background

At present, the outer sheath extrusion process in the wire and cable manufacturing process generally adopts a common extrusion molding machine head to perform extrusion molding processing. The structure and the processing principle are as follows: the heating system is arranged on the periphery of the machine head main body to protect and fix the position of the extrusion directional machine core, so that the plastic is plasticized and directionally transferred in the continuous extrusion process. The plastic is extruded into the flow channel connected with the machine core from the flow channel opening of the funnel by an extruding machine, the flow channel is designed to be provided with a groove which is smoothly bent and turned, the plastic is changed from the vertical direction to the horizontal direction along the direction of the flow channel, the plastic is simultaneously divided by the middle part of the machine core in the operation process, and the machine core is a cylinder, so the plastic forms an annular plastic flow at the core offset plate and the part of the interface of the molding outer die sleeve and the machine head. The material flow enters the forming external mold along the cylindrical space between the mold core and the external mold sleeve, the plastic is shaped and extruded on the outer surface of the position of the core of the tube-shaped wire with the mold core through the shape of the external opening and a subsequent cooling device, when the mold core, the external mold sleeve and the external mold deviate, the deviation adjusting screws are needed to be adjusted from the upper direction, the lower direction, the left direction and the right direction to be positioned on the same axis as the central position of the machine core, so that the purpose of non-deviation of the core is achieved, and the extrusion forming process of the electric wire and the cable is formed. This method is most suitable for extrusion molding of round cables, and also requires manual multiple offset adjustment operations.

The Chinese utility model 201921845840.2 discloses a general die sleeve device for a wire and cable extruder;

chinese invention patent 201810407029.X discloses a cable extruder;

chinese patent 201710928091.9 discloses a heating cable extrusion apparatus.

Traditional aircraft nose: firstly, plastics are walked along the annular runner of cylinder, and the basic shape is that the cylinder annular is formed in the aircraft nose, and when the material flow reaches the region of shaping external mold along the mold core, because the shaping external mold is also a tapered cylinder, the material flow just can be accepted in a smooth way, can reach flat purpose when extending to the last shaping play outer die orifice, and the export that cuts into the flat shape in circular region that only must force realizes the flat of appearance and extrudes. In order to cooperate the unit and the reinforcement of the control cable to combine a word horizontal arrangement, make the outer sheath extrude around the unit sinle silk evenly, the mold core is processed into the platykurtic from the original cone and cooperates, make the material flow space of extruding become unusual complicated like this, form the vortex in cone sudden change flat process and space body, the vortex can cause to extrude in-process appearance model design size and be difficult to hold, need through many times of adjustment and trial-manufacture just can reach ideal effect. And the thickness of the insulating layer is not easily changed.

Secondly, the vortex can also cause the non-uniformity of extrusion pressure, so that an operator is difficult to control in the deviation adjusting process, time and labor are wasted, labor is wasted, and the operator can not get a final result.

The traditional adjustable offset machine head is designed into two parts of a machine core main body and an outer forming main body which can be detachably butted in order to meet the requirement that a machine can manufacture cables with various specifications and models, the butting mode is characterized in that due to machining errors and convenience for operators to disassemble, the central point is offset when specifications are changed frequently, so that the plastic extrusion of the appearance cannot be uniform, the feasible measure is to adjust offset screws in four directions, namely up and down and left and right, in order to make the extrusion pressure uniform, the adjustment is carried out under the dynamic condition of adjusting and extruding, so that high requirements on the operation level are provided, and meanwhile, a certain adjusting process and time are required. A large amount of cable core semi-finished products and outer sheath materials are wasted, and the manufacturing energy consumption and cost are improved.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a system and a method for extruding a cable insulation layer.

The technical scheme of the invention is realized as follows:

the extrusion system of the cable insulation layer comprises an extruder and an extrusion die head, and is characterized in that the rear end of the extruder is provided with a first motor, and the front end of the extruder is provided with a connecting pipe;

the extrusion die head comprises a shell, an extrusion part, a cladding part and a forming part, wherein the extrusion part is arranged in the shell, a support plate is arranged on the shell, a second motor is arranged on the support plate, the extrusion part is provided with a rotating part and a main body part, the rotating part is connected with the second motor through a belt, the rotating part is arranged on the shell through a support frame, an annular pipe is arranged outside the shell and connected with a connecting pipe, a branch pipe is arranged on an inner ring of the annular pipe and penetrates through the shell to extend into the interior, a first gap is formed between the inner wall of the shell and the main body part, a spiral blade is arranged on the outer wall of the main body part and is arranged in the first gap, a cable hole is formed in the middle of the extrusion part, and a cable is arranged in the cable hole;

the cladding piece is provided with an installation part, a storage tank and a first fixing part, threads are arranged on the inner wall of the installation part, a discharge port is arranged in the middle of the storage tank, the discharge port is arranged at the lower end of the cable hole, the central lines of the discharge port and the storage tank coincide, the shell is provided with an installation groove, the cladding piece is arranged in the installation groove, a second fixing part is arranged on the outer wall of the shell, and the first fixing part is matched with the second fixing part and fixed through bolts;

the forming part is internally provided with a taper hole which is arranged at the right lower end of the discharge hole, and the forming part is arranged at the lower end of the coating part through threads;

the extruder is provided with a blanking hopper, the blanking hopper is provided with a first mounting block and a second mounting block, a sliding rod is arranged between the first mounting block and the second mounting block, the sliding rod is provided with a fixed piece and a sliding piece, the fixed piece is provided with a third motor, the lower end of the third motor is provided with a first rotating shaft, the first rotating shaft is provided with a first gear, the lower end of the first rotating shaft is provided with a first screw rod, the sliding piece is provided with a second rotating shaft, the second rotating shaft is provided with a second gear, the second gear is meshed with the first gear and connected with the second screw rod, the lower end of the second rotating shaft is provided with a second screw rod,

in the invention, the outer wall of the main body part is also provided with a guide sheet.

In the invention, the cross section of the lower end of the shell is conical, and the upper part of the shell is larger than the lower part of the shell.

In the invention, the tail part of the cable hole is provided with a first tooth opening, and the discharge hole is provided with a second tooth opening.

In the invention, a second gap is arranged between the first tooth mouth and the second tooth mouth, and the distance of the second gap is 2-4 mm.

In the invention, the angle between the bottom wall and the inner wall of the storage tank is 45-60 degrees.

In the present invention, the first gear is eccentrically mounted on the first rotation shaft, and the second gear is eccentrically mounted on the second rotation shaft.

In the invention, the sliding rod is provided with a spring, one end of the spring is contacted with the sliding piece, and the other end of the spring is contacted with the second mounting block.

The extrusion method of the cable insulation layer is characterized in that the extrusion system comprises the following steps:

s1, placing the raw materials of the insulating layer in a blanking hopper, and starting a third motor to enable the first screw rod and the second screw rod to be blanked;

s2, starting the extruder, melting the raw material of the insulating layer in the extruder, and extruding the raw material of the insulating layer into the connecting pipe under the driving of the first motor;

s3, enabling molten materials in the connecting pipe to enter the annular pipe, enabling the molten materials to enter a first gap between the shell and the extrusion part, starting the second motor to drive the extrusion part to rotate, enabling the materials to be extruded downwards, enabling the materials to be extruded out of the discharge port, enabling the copper core to pass through the cable hole, enabling the molten insulating layer to wrap the copper core, and enabling the copper core to be leveled through the taper hole in the forming part.

The system and the method for extruding the cable insulating layer have the following beneficial effects: this cable insulation's extrusion system simple structure, design benefit can extrude the insulating layer raw materials of melting through the extruder, then the insulating layer raw materials is attached to the copper core to the cooperation of rethread extrusion piece and cladding piece for the cladding is more stable. And the surface of the insulating layer is smoothed by the forming part after coating, so that the surface of the cable is more smooth.

The thickness of the insulating layer to be coated on the copper core can be conveniently changed, the replacement and the disassembly are convenient, and the production of different cables is facilitated.

Drawings

FIG. 1 is a schematic view of the extrusion system for cable insulation according to the present invention;

FIG. 2 is a schematic view of the extrusion die structure of FIG. 1;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a partial enlarged view of FIG. 4 at B;

FIG. 6 is a schematic view of the extrusion of FIG. 2;

FIG. 7 is a schematic view of the covering of FIG. 2;

fig. 8 is a schematic view of the internal structure of the lower hopper in fig. 1.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1 to 8, the extrusion system for a cable insulation layer of the present invention includes an extruder 1 and an extrusion die 2, wherein the extruder 1 has a first motor 3 at a rear end and a connection pipe 4 at a front end.

Extrusion die 2 is used to coat the molten insulating layer onto copper core 100. The extrusion die 2 includes a housing 5, an extrusion member 6, a covering member 7, and a molding member 8, the extrusion member 6 being mounted inside the housing 5, the covering member 7 being at a lower end of the housing 5, and the molding member 8 being at a lower end of the covering member 7. The shell 5 is used for containing melted raw materials of the insulating layer extruded by the extruder 1, the covering piece 7 is used for attaching the melted insulating layer to the copper core 100, and the molding piece 8 is used for pressing the covered insulating layer onto the copper core 100 and can also smooth the surface of the cable. The cross section of the lower end of the shell 5 is conical, the upper part is large, and the lower part is small, so that the molten insulating layer raw materials can flow down easily.

The housing 5 has a support plate with a second motor thereon. The extrusion member 6 has a rotation portion 9 and a main body portion 10, the rotation portion 9 is connected to the second motor through a belt, and the rotation portion 9 is mounted on the housing 5 through a support frame. The second motor drives the belt in rotation and then causes the extrusion 6 to rotate on the support.

The outer part of the housing 5 has a ring pipe 11, the ring pipe 11 is connected with the connecting pipe 4, the inner ring of the ring pipe 11 has a branch pipe 12, and the branch pipe 12 extends to the inner part through the housing. The melted raw material of the insulation layer from the connection pipe 4 enters the inside of the housing 5.

A first gap 13 is formed between the inner wall of the shell 5 and the main body part 10, a spiral blade 14 is arranged on the outer wall of the main body part 10, and the spiral blade 14 is arranged in the first gap 13. The melted insulating layer raw material is easily dropped into the first gap 13 from the upper end of the main body 10 when entering the main body 10, and a guide piece 141 is further provided on the outer wall of the main body 10. When the extrusion member 6 rotates, the guide plate 141 brings the molten insulation layer material at the upper end into the first gap 13 at the lower end, and then is brought downward by the spiral blade 14.

The middle of the extrusion 6 has a cable hole 15, in which cable hole 15 the cable is placed. The front portion of the cable hole 15 is the copper core 100, and then to the rear portion, it is covered with an insulating layer to form a cable.

The covering 7 has a mounting portion 16, a magazine 17 and a first fixing portion 18. The inner wall of the mounting part 16 is provided with threads, the middle of the storage tank 17 is provided with a discharge hole 19, and the discharge hole 19 is arranged at the lower end of the cable hole 15 and the central lines of the discharge hole 19 are overlapped. The cable hole 15 has a first tooth 20 at the end and a second tooth 21 at the outlet 19. The first gear opening 20 and the second gear opening 21 have a second gap 22 therebetween, and the distance of the second gap 22 is 2-4 mm. The angle between the bottom wall and the inner wall of the holding tank 17 is 45-60 deg.. The first tooth opening 20 and the second tooth opening 21 are used for guiding the melted raw material of the insulating layer, and can also cut the raw material, so that the cladding is more stable and smooth. The second gap 22 is the thickness of the coated insulating layer, and when a thicker insulating layer is required, the coating member 7 can be replaced, so that the angle between the bottom wall and the inner wall of the storage tank 17 is changed, and the thickness of the coated insulating layer is changed.

The shell 5 is provided with a mounting groove 23, the cladding piece 7 is arranged in the mounting groove 23, the outer wall of the shell 5 is provided with a second fixing part 24, and the first fixing part 18 is matched with the second fixing part 24 and fixed through a bolt 25;

the forming part 8 is internally provided with a taper hole 26, the taper hole 26 is arranged at the right lower end of the discharge hole 19, and the forming part 8 is arranged at the lower end of the cladding part 7 through threads. Taper hole 26 is big-end-up, can make the cable extruded when going out taper hole 26, with the insulating layer better adhere to on copper core 100, can also smooth the surface of insulating layer.

The extruder 1 is provided with a lower hopper 27, the lower hopper 27 is provided with a first mounting block 28 and a second mounting block 29, a slide rod 30 is arranged between the first mounting block 28 and the second mounting block 29, the slide rod 30 is provided with a fixed part 31 and a sliding part 32, the fixed part 31 is provided with a third motor 33, the lower end of the third motor 33 is provided with a first rotating shaft 34, the first rotating shaft 34 is provided with a first gear 35, the lower end of the first rotating shaft 34 is provided with a first screw rod 36, the sliding part 32 is provided with a second rotating shaft 37, the second rotating shaft 37 is provided with a second gear 38, the second gear 38 is meshed with the first gear 35, the lower end of the second rotating shaft 37 is provided with a second screw rod 39,

the first gear 35 is eccentrically installed on the first rotating shaft 34, and the second gear 38 is eccentrically installed on the second rotating shaft 37. The slide rod 30 has a spring 40 thereon, and one end of the spring 40 is in contact with the slider 32 and the other end is in contact with the second mounting block 29.

The third motor 33 rotates so that the first rotating shaft 34 at the lower end rotates, and the first screw 36 rotates the discharging. The first gear 35 rotates with it, which drives the second gear 38 to rotate, and the second gear 38 drives the second rotating shaft 37, which then rotates the second screw 39. And since the first gear 35 and the second gear 38 are eccentrically installed, the second gear 38 can be constantly moved, i.e., the sliding member 32 slides on the sliding rod 30 and then is pushed back again by the elastic force of the spring 40 after being away from the fixed member 31. So that the second screw rod 39 can rotate while moving to drive the material to be discharged.

The extrusion method of the cable insulation layer adopts the extrusion system, and comprises the following steps:

and S1, placing the raw material of the insulating layer in a blanking hopper, and starting a third motor to enable the first screw rod and the second screw rod to be blanked.

And S2, starting the extruder, melting the raw material of the insulating layer in the extruder, and extruding the raw material of the insulating layer into the connecting pipe under the driving of the first motor.

The front end of the copper core is wound by the winding frame and then conveyed into the cable hole, the rear end of the copper core is pulled by the tractor, and the insulating layer is cooled after being coated.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The extrusion system of the cable insulation layer comprises an extruder and an extrusion die head, and is characterized in that the rear end of the extruder is provided with a first motor, and the front end of the extruder is provided with a connecting pipe;

the extruder is provided with a blanking hopper, the blanking hopper is provided with a first mounting block and a second mounting block, a sliding rod is arranged between the first mounting block and the second mounting block, the sliding rod is provided with a fixing piece and a sliding piece, the fixing piece is provided with a third motor, the lower end of the third motor is provided with a first rotating shaft, the first rotating shaft is provided with a first gear, the lower end of the first rotating shaft is provided with a first screw rod, the sliding piece is provided with a second rotating shaft, the second rotating shaft is provided with a second gear, the second gear is meshed with the first gear and is connected with the second screw rod, and the lower end of the second rotating shaft is provided with a second screw rod.

2. The extrusion system of claim 1, wherein the body portion further comprises a guide tab on an outer wall thereof.

3. The cable insulation extrusion system of claim 1 wherein the lower end of the housing is tapered in cross-section with a larger top and a smaller bottom.

4. The system of claim 1, wherein the cable hole has a first notch at a rear portion thereof and a second notch at the discharge port.

5. The extrusion system of claim 4, wherein the first and second notches have a second gap therebetween, the second gap being 2-4mm apart.

6. The cable insulation extrusion system of claim 1, wherein the angle between the bottom wall and the inner wall of the accumulator tank is 45-60 °.

7. The extrusion system of claim 1, wherein the first gear is eccentrically mounted on a first rotational axis and the second gear is eccentrically mounted on a second rotational axis.

8. The extrusion system of cable insulation of claim 1, wherein the slide bar has a spring thereon, one end of the spring being in contact with the slide and the other end being in contact with the second mounting block.

9. A method for extruding an insulation layer of a cable, using the extrusion system of claim 1, comprising the steps of: