CN215703877U

CN215703877U - Aligning coated cable extruder head

Info

Publication number: CN215703877U
Application number: CN202122176814.9U
Authority: CN
Inventors: 周代烈; 周代干; 方勇
Original assignee: Jiangsu Xingji Intelligent Equipment Co ltd
Current assignee: Jiangsu Xingji Intelligent Equipment Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-02-01
Anticipated expiration: 2031-09-09

Abstract

The utility model discloses an aligning coated cable extruder head, which comprises a shell, wherein the front end of the shell is connected with an outer die adjusting seat internally provided with an outer layer shunt body and an outer die sleeve capable of aligning, one side of the shell is provided with a connecting seat capable of being connected with two extruders, the outer die adjusting seat is provided with an outer connecting seat capable of being connected with the extruders, a middle die sleeve is arranged in the shell in front of the middle layer shunt body, the inner die sleeve is arranged in front of the inner layer shunt body in a concentric mode, the middle layer shunt body and the inner layer shunt body are axially positioned and adjustable, the shell, the middle layer shunt body and the inner layer shunt body are correspondingly supported on an extrusion head support seat, a middle telescopic rod and a telescopic core rod which can be mutually telescopic, and the extrusion head support seat is arranged on a movable seat hinged with a base through a movable support arm. The utility model can not only regulate and control the concentricity between the insulating layers and facilitate the control of the compact degree and the coating adhesive force of the coating material of each insulating layer, improve the cable quality, but also ensure that the cable production equipment occupies small space and the relevant components of the flow passage are convenient to disassemble, assemble and clean.

Description

Aligning coated cable extruder head

Technical Field

The utility model relates to cable production equipment, in particular to an extruder head in multilayer insulation cable production equipment.

Background

The multilayer insulated cable is a power supply carrier applied to various industries and key equipment, the periphery of a cable conductor is coated with two or more than two coating layers of different insulating materials, the concentricity between each insulating layer and the conductor of the multilayer insulated cable must be ensured, the smoothness of the surface of each extruded insulating coating material and the compactness and compactness of each insulating coating material are also ensured, and thus the cable has higher quality and meets the use requirements. Because different insulating materials have different technological properties such as plasticizing temperature, fluidity and the like, the quality of the multilayer insulated cable depends on the manufacturing quality of an extruder head, and is closely related to the structure of the extruder head and technological parameters in the extrusion process, the conventional extruder head comprises a forming external mold, a positioning internal mold concentric with the forming external mold and two to three shunt bodies, coating materials of all insulating layers are extruded by a plurality of extruders and pass through the corresponding shunt bodies to form annular coating layers, each coating layer enters an annular cavity between the forming external mold and the positioning internal mold to converge to form multilayer insulated coating, the technological parameters such as temperature, pressure and the like in the plasticizing process are different due to different coating materials used by all the insulating layers, the flow of the coating materials in the extrusion process is unstable, the extrusion process is difficult to control, and the formed insulating layers have uneven thickness, Decentraction, the difference of the compact degree and the compact degree of each insulating layer coating material is large, the adhesive force is not high, and the cable quality is difficult to ensure.

In the production process of conventional multilayer insulation cable, a plurality of extruders usually adopt the mode of extruding to extruding the interior feed of head, if two extruders are separately located one and are extruded the both sides of head and simultaneously to extruding the head feed, this width that can make the production line becomes very big, occupies very big production place, and operating personnel is current inconvenient moreover, the operation difficulty.

In addition, the heater is a necessary device for ensuring the flowability of the coating material and improving the coating quality in the extrusion head, the heater is circumferentially distributed in the shell, the extrusion head is kept in a certain temperature range by heating of the heater, the heater in the conventional extrusion head measures the temperature by the temperature sensor distributed in the shell to determine the opening and closing of the heater, but because the heat dissipation conditions of all parts in the extrusion head are inconsistent, the simple opening and closing control of the heater still causes the temperature difference of all parts in the extrusion head to be larger, so that the coating material has different temperatures at different flow passage parts to cause the difference of flow speed or pressure, which is unacceptable for the manufacture of high-quality cables.

In order to ensure the use precision of the extrusion head, related parts of the flow channel such as an inner hole of a shell of the extrusion head and each shunt body need to be cleaned frequently, so that the coating material is prevented from generating adhesion in the flow channel to influence the normal flow of the coating material, and in addition, the extrusion head also needs to be cleaned when the production variety of a cable production line is changed, so that the residual coating material used by the previous product is removed or the specification and the size of the related die sleeve in the extrusion head are changed. When clearing up or changing the die sleeve extruding the head, need unpack apart its inside all components relevant with the runner, to the head of extruding of production multilayer insulation cable, be equipped with middle level reposition of redundant personnel and inlayer reposition of redundant personnel in extruding the casing of head, its structure is complicated, and the cleaning process relates to a plurality of runners, need unpack middle level reposition of redundant personnel and skin reposition of redundant personnel apart, therefore the dismouting process of extruding the head is comparatively time-consuming, and extrude head and extruder and link to each other, the spatial position of locating is limited, it is very inconvenient to implement the clearance, cleaning process inefficiency.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide the aligning coated cable extruder head, which can regulate and control the concentricity between insulating layers, is convenient to control the compact degree and coating adhesive force of coating materials of the insulating layers, improves the cable quality, and enables cable production equipment to occupy a small space and related components of a flow channel to be convenient to disassemble, assemble and clean.

In order to solve the technical problem, the aligning coated cable extruding machine head comprises a machine shell, an outer layer shunting body and a middle layer shunting body, wherein the inner layer shunting body and a feeding channel are arranged on the machine shell; an outer feeding channel is arranged on the outer die adjusting seat, an outer connecting seat is arranged on the outer die adjusting seat, an outer feeding channel is arranged on the outer connecting seat, and the outlet end of the outer feeding channel is communicated with the outer feeding channel; the middle-layer shunting body is fixedly connected in an inner taper hole of the machine shell, a middle die sleeve is arranged at the front end of the middle-layer shunting body, the inner-layer shunting body is installed in the inner taper hole of the middle-layer shunting body, an inner die adjusting pipe is installed in an inner hole of the inner-layer shunting body through a spherical surface supporting pair, an inner die sleeve is arranged at the front end of the inner die adjusting pipe, and the rear end of the inner die adjusting pipe is fixedly connected with the inner-layer shunting body in an adjustable center manner; the outer-layer shunt is movably inserted into an inner hole of the outer die adjusting seat along the axial direction, an outer die fixing sleeve is arranged at the outer end of the outer-layer shunt, the outer die fixing sleeve is fixedly connected with the outer die adjusting seat in a centering manner, and an outer die sleeve is arranged in the inner hole of the outer die fixing sleeve; a first annular cavity is arranged between the outer die sleeve and the middle die sleeve, the first annular cavity is communicated with a diversion trench on the middle-layer diverter, the diversion trench on the middle-layer diverter is communicated with a corresponding feeding channel arranged on the machine shell, the first annular cavity is also communicated with a diversion trench on the outer-layer diverter, the diversion trench on the outer-layer diverter is communicated with an outer feeding channel arranged on the outer die adjusting seat, a second annular cavity is arranged between the middle die sleeve and the inner die sleeve, the second annular cavity is communicated with a diversion trench on the inner-layer diverter, and the diversion trench on the inner-layer diverter is communicated with a corresponding feeding channel on the machine shell through a through hole on the sleeve wall of the middle-layer diverter; a plurality of heating units are distributed in the shell along the circumferential direction, and each group of heating units is correspondingly provided with at least one temperature sensor; the machine shell is supported on an extrusion head support, a telescopic core rod and at least one middle telescopic rod are movably mounted in the extrusion head support, the telescopic core rod, the middle telescopic rod and the extrusion head support are sequentially sleeved and can axially extend and retract, an inner division fluid support is mounted at the extending end of the telescopic core rod and is connected with an inner layer division fluid, a middle division fluid support is mounted at the extending end of a middle telescopic rod and is connected with a middle layer division fluid; the extrusion head support is arranged on a movable seat, and the movable seat is hinged with the base through a movable support arm.

In the structure, the connecting seat is arranged on the casing, the two feeding channels are arranged on the connecting seat, the outlet ends of the two feeding channels are respectively communicated with the corresponding feeding channels on the casing, the axis of the inlet end of one feeding channel is obliquely arranged towards the front end of the casing, and the axis of the inlet end of the other feeding channel is obliquely arranged towards the rear end of the casing; the outer die adjusting seat is provided with an outer feeding channel, the outer die adjusting seat is provided with an outer connecting seat, the outer connecting seat is provided with an outer feeding channel, the outlet end of the outer feeding channel is communicated with the outer feeding channel, the extruding head can be connected with the two extruders through the connecting seat, the two feeding channels on the connecting seat are respectively communicated with the corresponding extruder discharge ports, the two extruders can be arranged on the same side of the extruding head, the two feeding channels are respectively inclined towards the front end and the rear end of the extruding head, so that enough installation space is ensured between the two extruders and between the extruders and the extruding head, the extruding head can be connected with the extruders through the outer connecting seat besides the connecting seat and the two extruders, the outer connecting seat can also be arranged on the same side of the connecting seat, at the moment, the extruding head can be connected with the two extruders through the two connecting seats, and can be respectively connected with the two extruders through the outer connecting seat and the connecting seat, the layout can also ensure that the distance between the extruder and the extrusion head is very close and the distances between the two extruders and the extrusion head are basically equal, which is very beneficial to the control of the conveying and extrusion quality of two different coating materials; the outer connecting seat can also be arranged on the upper side of the extrusion head and is connected with a third extruder, so that the coating of three layers of insulating materials can be realized, and the production requirement of a multilayer insulating cable is better met.

The middle-layer shunting body is fixedly connected in an inner taper hole of the machine shell, a middle die sleeve is arranged at the front end of the middle-layer shunting body, the inner-layer shunting body is installed in the inner taper hole of the middle-layer shunting body, an inner die adjusting pipe is installed in an inner hole of the inner-layer shunting body through a spherical surface supporting pair, an inner die sleeve is arranged at the front end of the inner die adjusting pipe, and the rear end of the inner die adjusting pipe is fixedly connected with the inner-layer shunting body in an adjustable center manner; the outer shunt body is movably inserted into an inner hole of the outer die adjusting seat along the axial direction, an outer die fixing sleeve is arranged at the outer end of the outer shunt body, the outer die fixing sleeve and the outer die adjusting seat can be fixedly connected in a centering manner, an outer die sleeve is arranged in the inner hole of the outer die fixing sleeve, a middle die sleeve arranged at the front end of the middle shunt body is fixedly arranged relative to the shell, and an inner die sleeve arranged at the front end of an inner die adjusting pipe arranged in the inner hole of the inner shunt body through a spherical bearing pair can be fixedly connected with the inner shunt body in a centering manner through the rear end of the inner die adjusting pipe, so that the central position can be changed, the radial forming size of an insulating coating layer formed between the middle die sleeve and the inner die sleeve and fed by the inner shunt body can be adjusted, the thickness of the insulating coating layer is uniform along the circumferential direction, and the concentricity between the insulating layer and the conductor is ensured; the outer die sleeve arranged in the inner hole of the outer die fixing sleeve can change the central position along with the outer die fixing sleeve through the adjustable center fixed connection between the outer die fixing sleeve and the outer die adjusting seat, so that the radial forming size of the insulating coating layer between the outer die sleeve and the middle die sleeve can be adjusted, the thickness of the insulating coating layer is uniform along the circumferential direction, and the concentricity between the insulating layer and the adjacent insulating layer is ensured.

The first ring cavity is arranged between the outer die sleeve and the middle die sleeve and is communicated with the splitter boxes on the middle-layer splitter body, the splitter boxes on the middle-layer splitter body are communicated with the corresponding feeding channels arranged on the machine shell, the first ring cavity is also communicated with the splitter boxes on the outer-layer splitter body, the splitter boxes on the outer-layer splitter body are communicated with the outer feeding channels arranged on the outer die adjusting seat, the second ring cavity is arranged between the middle die sleeve and the inner die sleeve and is communicated with the splitter boxes on the inner-layer splitter body, the splitter boxes on the inner-layer splitter body are communicated with the corresponding feeding channels on the machine shell through the through holes on the sleeve wall of the middle-layer splitter body, and then an insulating coating material provided by an extruder communicated with the inner-layer splitter body forms an inner-layer insulating layer through the second ring cavity; a first ring cavity arranged between the outer die sleeve and the middle die sleeve is communicated with a diversion groove on the outer layer diversion body and a diversion groove on the middle layer diversion body, the outer layer diversion body is positioned at the front end of the middle layer diversion body, when only the outer layer diversion body or only the middle layer diversion body is communicated with a second extruder, the insulating coating material provided by the extruder flows to the first ring cavity through the outer layer diversion body or the middle layer diversion body to form an outer insulating layer, thereby producing a two-layer insulating cable, the middle layer diversion body is communicated with a corresponding second extruder, and when the outer layer diversion body is communicated with a corresponding third extruder, the insulating coating material provided by the second extruder forms a middle layer insulating layer through the middle layer diversion body, the insulating coating material provided by the third extruder forms an outer layer insulating layer through the outer layer diversion body outside the middle layer formed by the insulating coating material provided by the second extruder through the middle layer diversion body, the middle layer insulating layer and the outer layer insulating layer cover the covered inner layer insulating layer through the first annular cavity at the same time, so that a three-layer insulating cable is produced; the outer-layer shunt body is movably inserted into the inner hole of the outer die adjusting seat along the axial direction, so that the first annular cavity can adjust the cavity thickness of the first annular cavity through the change of the axial position of the outer-layer shunt body, namely, the flow area of the first annular cavity can be adjusted, the flow speed and the flow resistance of the insulating coating material flowing through the first annular cavity can be adjusted, the extrusion pressure of the insulating coating material extruded through the first annular cavity can be changed, and the effects of controlling the compact degree and the coating adhesion of the insulating layer formed through the first annular cavity can be achieved; similarly, the flow area of the second annular cavity can be adjusted by changing the axial position of the inner die sleeve arranged at the front end of the inner die adjusting pipe, so that the effects of controlling the compact degree and the cladding adhesion of the insulating layer formed by the second annular cavity can be achieved, and the quality of the cable is improved.

Because a plurality of heating units are distributed in the casing along the circumferential direction, each group of heating units is correspondingly provided with at least one temperature sensor, each heating unit can be independently started for heating or closed according to the temperature measurement data of the corresponding temperature sensor, compared with the situation that each heater in the prior art is simultaneously started and closed, the control of the temperature in the extrusion head is more accurate, the temperature difference of each part is smaller, and the quality of the produced cable is further improved.

In addition, because the casing is supported on the extrusion head support, a telescopic core rod and at least one middle telescopic rod are movably arranged in the extrusion head support, the telescopic core rod, the middle telescopic rod and the extrusion head support are sequentially sleeved and can axially extend and retract, an inner division fluid support is arranged at the extending end of the telescopic core rod and is connected with the inner layer shunt body, a middle division fluid support is arranged at the extending end of the middle telescopic rod and is connected with the middle layer shunt body, the extrusion head support is fixedly connected with the casing of the extrusion head and is connected with the inner layer shunt body in the extrusion head, the middle division fluid support is connected with the middle layer shunt body in the extrusion head, when the extrusion head is in a working state, the position of the inner division fluid support corresponds to the mounting position of the inner layer shunt body in the extrusion head, and the position of the middle division fluid corresponds to the mounting position of the middle layer shunt body in the extrusion head, the middle telescopic rod and the telescopic core rod are both in a retraction state, when the extrusion head needs to carry out operations such as runner cleaning and the like to separate the inner-layer shunt body and the middle-layer shunt body, the inner-layer shunt body support can play a role in supporting the inner-layer shunt body and can always support the inner-layer shunt body to be axially extracted until the inner-layer shunt body is separated from the middle-layer shunt body along with the dismounting of the connecting bolt between the inner-layer shunt body and the middle-layer shunt body, the telescopic core rod is in an extension state, the middle-layer shunt body support can play a role in supporting the middle-layer shunt body and can always support the middle-layer shunt body to be axially extracted until the middle-layer shunt body is separated from the shell, the middle telescopic rod is in an extension state at the moment, the extension length of the middle telescopic rod provided with the middle-layer shunt body support corresponds to the extraction length of the middle-layer shunt body, and the extension distance of the inner division fluid support on the telescopic core rod relative to the middle division fluid support corresponds to the extraction length of the inner layer division fluid relative to the middle layer division fluid. Like this, middle level shunt and inlayer shunt can obtain the support of middle telescopic link and flexible core bar through well shunt support and interior shunt support after taking apart, can carry out operations such as runner clearance rapidly, only need after the clearance with middle telescopic link and flexible core bar shrink can send back the normal position with middle level shunt and inlayer shunt to can be convenient for extrude quick assembly disassembly of the interior middle level shunt of head and inlayer shunt, and be convenient for the runner clearance.

Furthermore, the extrusion head support is arranged on the movable seat, the movable seat is hinged with the base through the movable support arm, the movable seat can change the position along with the rotation of the movable support arm relative to the base, and the extrusion head support arranged on the movable seat changes the position along with the rotation of the movable support arm, so that all components such as a machine shell arranged on the extrusion head support, a middle-layer shunt body and an inner-layer shunt body can be driven to move out of the original installation position and move to the position convenient for cleaning operation after being disconnected from a related extruder, and connecting seats, outer connecting seats and other related flow passage components connected with the machine shell are larger in dismounting space, and the cleaning is more convenient.

In a preferred embodiment of the present invention, an included angle α between an axis of an inlet end of one of the feeding channels and an axis of the casing is 40 ° to 60 °, and an included angle β between an axis of an inlet end of the other feeding channel and an axis of the casing is 40 ° to 60 °; the axis of the inlet end of the outer feeding channel is obliquely arranged towards the front end of the outer die adjusting seat, and the included angle gamma between the axis of the inlet end of the outer feeding channel and the axis of the machine shell is 40-60 degrees; the feeding channel and the outer feeding channel are both provided with a feeding switching valve core, the feeding switching valve core is provided with a main feeding channel and a bypass channel, the inlet end of the feeding channel is communicated with the outlet end of the feeding channel through the main feeding channel, the inlet end of the feeding channel can be communicated with the outside of the connecting seat through the bypass channel, the inlet end of the outer feeding channel is communicated with the outlet end of the outer feeding channel through the main feeding channel, and the inlet end of the outer feeding channel can be communicated with the outside of the outer connecting seat through the bypass channel. By adopting the embodiment, the angle value of the included angle alpha between the axis of the inlet end of one feeding channel and the axis of the shell, the included angle beta between the axis of the inlet end of the other feeding channel and the axis of the shell and the angle gamma between the axis of the inlet end of the outer feeding channel and the axis of the shell can ensure that enough installation and connection space can be arranged between the extruder and the extrusion head and between the two extruders, the arranged feeding switching valve core can change the output route of feeding, before formal production is started, the coating material can be output to the outside of the connecting seat or the outer connecting seat from the bypass channel through the feeding switching valve core, so that the state of the coating material can be checked, after the state of the coating material is normal, the feeding switching valve core is rotated to convey the coating material to the feeding channel or the outer feeding channel from the feeding main channel, so as to enter the formal production stage, and the yield of the produced cable is ensured, reduces waste and improves economic benefit and production efficiency.

In another preferred embodiment of the present invention, the outer circumference of the middle layer shunt body is fitted with the inner taper hole of the casing, an axial positioning adjustment device is arranged between the rear end of the middle layer shunt body and the casing, the outer circumference of the inner layer shunt body is fitted with the inner taper hole of the middle layer shunt body, and an axial positioning adjustment device is arranged between the rear end of the inner layer shunt body and the middle layer shunt body; the axial positioning adjusting device comprises an adjusting piece, the adjusting piece comprises a positioning end part and an adjusting screw rod part, an adjusting tongue groove is arranged on the end face of the adjusting screw rod part, the adjusting screw rod part is screwed on the flange edge along the axial direction, the outer end of the adjusting screw rod part is further screwed with a locking nut, grooves corresponding to the positioning end part and the locking nut are respectively arranged on the two end faces of the flange edge, and the flange edge is arranged at the outer end of the middle-layer fluid and the outer end of the inner-layer fluid. By adopting the embodiment, the axial positioning adjusting device can ensure the matching consistency of the outer periphery of the middle-layer shunt body and the inner taper hole of the shell after each disassembly and assembly and the matching consistency of the outer periphery of the inner-layer shunt body and the inner taper hole of the middle-layer shunt body after each disassembly and assembly, which are very important for the middle-layer shunt body and the inner-layer shunt body which need to be disassembled and cleaned frequently, particularly after the middle-layer shunt body or the inner-layer shunt body is disassembled, the shell or the middle-layer shunt body positioned in the shell still maintains relatively high working temperature, the middle-layer shunt body separated from the shell or the inner-layer shunt body separated from the middle-layer shunt body can reduce the temperature and generate cold shrinkage phenomenon in the cleaning process, after the re-assembly, if the middle-layer shunt body or the inner taper body is axially fixed only by being attached to the conical surface of the corresponding hole, the temperature of the middle-layer shunt body or the inner-layer shunt body is raised to the working temperature and generates interference fit with the shell or the middle-layer shunt body when the inner-layer shunt body expands thermally, the axial positioning adjusting device ensures that the axial position is consistent when the cable is remounted after each disassembly, thereby effectively avoiding the problems; the axial positioning adjusting device has the advantages that the positioning end part can be in contact with the corresponding machine shell or the middle-layer shunt body to limit the position of the middle-layer shunt body or the inner-layer shunt body, the adjusting screw rod part is screwed on the flange edge on the middle-layer shunt body or the inner-layer shunt body, the adjusting groove can be used for rotating the adjusting screw rod part to change the axial position of the positioning end part and lock the adjusted correct position through the locking nut, and the adjusting part and the locking nut can be mostly located within the width range of the flange edge in the axial direction.

In another preferred embodiment of the present invention, the inner mold sleeve is screwed to the front end of the inner mold adjusting pipe, and an axial positioning adjusting washer is disposed between the inner mold sleeve and the inner mold adjusting pipe. By adopting the embodiment, the inner die sleeves with different sizes and specifications can be conveniently replaced, and the axial positioning gasket can adopt different thicknesses to conveniently adjust the axial position of the inner die sleeve, so that the compactness and the coating adhesive force of the inner insulating layer can be conveniently regulated and controlled, and the cable quality is improved.

In a further preferred embodiment of the present invention, a positioning sleeve for an outer mold fixing sleeve is disposed between the outer mold adjusting seat and the outer mold fixing sleeve, the positioning sleeve for the outer mold fixing sleeve is screwed on the outer mold adjusting seat, and a positioning sleeve for the outer mold sleeve is disposed between the outer mold fixing sleeve and the outer mold sleeve, and the positioning sleeve for the outer mold sleeve is screwed on the outer mold fixing sleeve. By adopting the embodiment, the axial position of the outer die fixing sleeve can be conveniently adjusted by rotating the positioning sleeve for the outer die fixing sleeve, and the axial position of the outer die sleeve can be conveniently adjusted by rotating the positioning sleeve for the outer die sleeve, so that the flow area of the first annular cavity is convenient to adjust, and the cable quality is convenient to improve.

In another further preferred embodiment of the present invention, centering adjustment screws are screwed at the rear end of the inner layer shunt body along the radial direction, at least three positioning adjustment screws are uniformly distributed along the circumferential direction, and the rear end of the inner mold die adjusting pipe is fixedly connected with the inner layer shunt body through the centering adjustment screws in a centering manner; and the outer die adjusting seat is spirally connected with centering adjusting screws along the radial direction, at least three positioning adjusting screws are uniformly distributed along the circumferential direction, and the outer die fixing sleeve is fixedly connected with the outer die adjusting seat in a centering manner through the centering adjusting screws. By adopting the embodiment, the central position of the rear end of the inner die adjusting pipe and the central position of the outer die fixing sleeve are convenient to adjust, and the inner die adjusting pipe and the outer die fixing sleeve are reliable to fix after adjustment.

In still another preferred embodiment of the present invention, the cross sections of the telescopic core rod and the intermediate telescopic rod are rectangular, an outer elastic support sleeve is fitted around the outer circumference of the inner end of the telescopic core rod and the outer circumference of the inner end of the intermediate telescopic rod, the outer circumference of the outer elastic support sleeve is fitted to the inner hole of the corresponding intermediate telescopic rod or the inner hole of the corresponding extrusion head support, an inner elastic support sleeve is fitted around the inner hole of the outer extension end of the intermediate telescopic rod and the inner hole of the corresponding end of the extrusion head support, and the inner hole of the inner elastic support sleeve is fitted to the outer circumference of the corresponding telescopic core rod or the outer circumference of the corresponding intermediate telescopic rod. By adopting the embodiment, the telescopic core rod and the middle telescopic rod with rectangular cross sections can conveniently avoid the telescopic core rod and the middle telescopic rod from rotating in the telescopic process, and further ensure the convenient assembly and disassembly of the middle-layer shunt body and the inner-layer shunt body; the telescopic core rod and the middle telescopic rod can be supported in a sliding manner through the elastic supporting outer sleeve and the elastic supporting inner sleeve in the telescopic process, telescopic resistance is reduced, and axial stroke limitation can be performed through the elastic supporting outer sleeve and the elastic supporting inner sleeve to prevent slipping.

In a further preferred embodiment of the present invention, the upper portion of the internal dividing fluid support and the upper portion of the intermediate dividing fluid support are fork-shaped, the upper portion of the internal dividing fluid support and the upper portion of the intermediate dividing fluid support are respectively provided with a plurality of rollers, the rotation axes of the rollers on the internal dividing fluid support and the intermediate dividing fluid support are respectively located on a corresponding circumference, the center of the circumference is located on the axis of the circular hole at the fork-shaped opening, and the central angle δ corresponding to the left and right rollers located at the fork-shaped opening end is smaller than 180 °; the rollers on the inner shunting body support are positioned on the same plane, the rollers on the middle shunting body support are positioned on the same plane, the rear ends of the middle-layer shunting body and the inner-layer shunting body are respectively provided with a circumferential groove corresponding to the rollers, the middle-layer shunting body is rotatably supported on the middle shunting body support through the circumferential grooves and the corresponding rollers, and the inner-layer shunting body is rotatably supported on the inner shunting body support through the circumferential grooves and the corresponding rollers. By adopting the embodiment, the upper part of the forked inner division fluid support and the upper part of the middle division fluid support can be conveniently connected with the corresponding inner layer shunt body and the middle layer shunt body, and the roller can be inserted into the corresponding circumferential grooves at the rear end of the middle layer shunt body and the rear end of the inner layer shunt body, so that the inner layer shunt body and the middle layer shunt body can be rotatably supported on one hand and can be further conveniently cleaned on the whole periphery of the inner layer shunt body and the middle layer shunt body on the other hand, and can be axially limited on the other hand, and the disassembly and assembly are further convenient; and the central angle delta corresponding to the left and right rollers positioned at the fork-shaped opening end is less than 180 degrees, so that the middle-layer shunt body and the inner-layer shunt body are ensured not to be separated from the fork-shaped opening.

In another further preferred embodiment of the present invention, the lower end of the internal division fluid support is connected to the telescopic core bar through a pin shaft, the pin shaft is inserted into a pin shaft elongated slot on the telescopic core bar, the length direction of the pin shaft elongated slot is parallel to the telescopic direction of the telescopic core bar, the internal division fluid support can be fixedly connected to the telescopic core bar at the front end position of the pin shaft elongated slot, and the internal division fluid support can be inverted and fixedly connected to the rear end position of the pin shaft elongated slot through the pin shaft; the lower end of the middle dividing fluid support is fixedly connected with the middle telescopic rod. By adopting the embodiment, the internal shunting body support can increase the telescopic stroke through the pin shaft and the long pin shaft groove on the telescopic core rod, so that the lengths of the telescopic core rod and the middle telescopic rod can be correspondingly reduced, the rear end of the long pin shaft groove is turned over to enable the internal shunting body to rotate from the position above the telescopic core rod to the position below the telescopic core rod, the cleaning operation space is further enlarged, the cleaning of a flow channel is convenient, the internal shunting body support and the telescopic core rod can be fixedly connected at the front end and the rear end of the long pin shaft groove, and the cleaning operation cannot be influenced by the displacement of the internal shunting body support in the cleaning process; the lower end of the middle dividing fluid support is fixedly connected with the middle telescopic rod, so that the middle dividing fluid can be prevented from influencing cleaning operation due to the displacement of the middle dividing fluid support in the cleaning process

In a further preferred embodiment of the present invention, the movable arm comprises a front arm and a rear arm, one end of the front arm is hinged to one end of the rear arm, the movable base is hinged to the other end of the front arm, and the other end of the rear arm is hinged to the base. By adopting the embodiment, the movable seat can be conveniently and flexibly moved to a required position, and the cleaning of each part and each component of the extrusion head is further facilitated.

Drawings

The self-aligning covered cable extruder head of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic structural diagram of one embodiment of a self-aligning coated cable extruder head according to the present invention;

FIG. 2 is a cross-sectional view taken at location A-A of the structure of FIG. 1;

FIG. 3 is an enlarged fragmentary view of the feed switch spool portion of the configuration of FIG. 2;

FIG. 4 is an enlarged fragmentary view of the axial positioning adjustment device portion of the structure of FIG. 2;

FIG. 5 is a cross-sectional view of the structure of FIG. 1 taken along the axis of the extrusion head support;

FIG. 6 is a schematic view of the structure of FIG. 5 with the telescoping core rod and intermediate telescoping rod extended;

FIG. 7 is a right side view of the structure shown in FIG. 5;

fig. 8 is a schematic diagram of the movable arm portion of the structure of fig. 1.

In the figure: 1-machine shell, 2-external mold adjusting seat, 3-centering adjusting screw, 4-external layer shunt, 5-external mold sleeve, 6-first ring cavity, 7-external mold sleeve positioning sleeve, 8-second ring cavity, 9-external mold fixing sleeve positioning sleeve, 10-internal mold sleeve, 11-middle mold sleeve, 12-external mold fixing sleeve, 13-shunt groove, 14-external connecting seat, 15-external feeding channel, 16-external feeding channel, 17-feeding switching valve core, 18-sealing gasket, 19-reducing taper sleeve, 20-spherical bearing pair, 21-feeding channel, 22-feeding channel, 23-connecting seat, 24-middle layer shunt, 25-internal layer shunt, 26-internal mold adjusting pipe, 27-axial positioning adjusting device, 28-mould adjusting pipe locking nut, 29-axial positioning adjusting washer, 30-heating unit, 31-main feeding channel, 32-bypass channel, 33-adjusting piece, 34-positioning end part, 35-adjusting screw part, 36-flange edge, 37-adjusting mortise, 38-locking nut, 39-base, 40-movable support arm, 41-movable seat, 42-extrusion head support, 43-middle telescopic rod, 44-telescopic core rod, 45-pin shaft elongated slot, 46-pin shaft, 47-internal dividing fluid support, 48-middle dividing fluid support, 49-elastic supporting inner sleeve, 50-roller, 51-elastic supporting outer sleeve, 52-circumferential groove, 53-middle dividing fluid connecting piece, 54-internal dividing fluid connecting piece, 55-rear arm, 56-front arm.

Detailed Description

In the aligning coated cable extruder head shown in fig. 1 and 2, a casing 1 is a tubular member, an outer mold adjusting base 2 is installed at the front end of the casing 1, an outer layer shunt 4, a middle layer shunt 24 and an inner layer shunt 25 are all installed in the casing 1 and the outer mold adjusting base 2, and a feeding channel 22 is arranged on the casing 1.

A connecting seat 23 is arranged on one side of the casing 1, the connecting seat 23 is fixedly connected with the casing 1 through a sealing gasket 18, two feeding channels 21 are arranged on the connecting seat 23, the axes of the feeding channels 21 are curved, the outlet ends of the two feeding channels 21 are respectively communicated with corresponding feeding channels 22 on the casing 1, the axes of the inlet ends of the two feeding channels 21 are horizontally arranged, the axis of the inlet end of one feeding channel 21 is obliquely arranged towards the front end of the casing 1, and the axis of the inlet end of the other feeding channel 21 is obliquely arranged towards the rear end of the casing 1; an outer feeding channel 16 is arranged on the outer die adjusting seat 2, an outer connecting seat 14 is arranged on the outer die adjusting seat 2, the outer connecting seat 14 is fixedly connected with the outer die adjusting seat 2 through a sealing gasket 18, an outer feeding channel 15 is arranged on the outer connecting seat 14, and the outlet end of the outer feeding channel 15 is communicated with the outer feeding channel 16. As a preferred embodiment, the outer connecting seat 14 and the connecting seat 23 are installed on the same side, the axis of the outer feeding channel 15 is a curve, the axis of the inlet end of the outer feeding channel 15 is inclined towards the front end of the outer die adjusting seat 2, and the included angle γ between the axis of the inlet end of the outer feeding channel 15 and the axis of the machine shell 1 is 40-60 degrees; the included angle alpha between the axis of the inlet end of one feeding channel 21 and the axis of the machine shell 1 is 40-60 degrees, and the included angle beta between the axis of the inlet end of the other feeding channel 21 and the axis of the machine shell 1 is 40-60 degrees; the inlet ends of the feed channels 21 and the outer feed channel 15 are both communicated with the outlet of the corresponding extruder, and the two extruders are connected with the inlet ends of the two feed channels 21 on the connecting seat 23 or the inlet end of one feed channel 21 on the connecting seat 23 and the inlet end of the outer feed channel 15 on the outer connecting seat 14 through flanges.

A supply switching valve core 17 is arranged in each of the supply channel 21 and the outer supply channel 15, the supply switching valve core 17 is rotatably arranged on the connecting seat 23 or the outer connecting seat 14, the axis of the supply switching valve core 17 is perpendicular to the axis of the corresponding supply channel 21 or the axis of the corresponding outer supply channel 15, referring to fig. 3, a main supply channel 31 and a bypass channel 32 are arranged on the supply switching valve core 17, the main supply channel 31 traverses the supply switching valve core 17, the bypass channel 32 is arranged on the periphery of the supply switching valve core 17, the inlet end of the supply channel 21 is communicated with the outlet end of the supply channel 21 through the main supply channel 31, and the bypass channel 32 is opposite to the inlet end of the supply channel 21 by rotating the supply switching valve core 17, so that the inlet end of the supply channel 21 is communicated with the outside of the connecting seat 23 through the bypass channel 32; similarly, the inlet end of the outer feed passage 15 communicates with the outlet end of the outer feed passage 15 through the main feed passage 31, and rotating the feed switching spool 17 to make the bypass passage 32 oppose the inlet end of the outer feed passage 15 allows the inlet end of the outer feed passage 15 to communicate with the outside of the outer connecting seat 14 through the bypass passage 32.

The middle-layer shunt body 24 is fixedly connected in an inner taper hole of the machine shell 1, the periphery of the middle-layer shunt body 24 is attached to the inner taper hole of the machine shell 1, an axial positioning adjusting device 27 is arranged between the rear end of the middle-layer shunt body 24 and the machine shell 1, a middle die sleeve 11 is arranged at the front end of the middle-layer shunt body 24, the middle die sleeve 11 is screwed on a reducing taper sleeve 19, and the reducing taper sleeve 19 is screwed at the front end of the middle-layer shunt body 24; the inner layer shunt body 25 is arranged in the inner taper hole of the middle layer shunt body 24, the periphery of the inner layer shunt body 25 is attached to the inner taper hole of the middle layer shunt body 24, and an axial positioning adjusting device 27 is also arranged between the rear end of the inner layer shunt body 25 and the middle layer shunt body 24; referring to fig. 4, as a preferred embodiment, the axial positioning adjustment device 27 includes an adjustment member 33, the adjustment member 33 includes a positioning end portion 34 and an adjustment screw portion 35, the diameter of the positioning end portion 34 is larger than the diameter of the adjustment screw portion 35, an adjustment tongue groove 37 is provided on an end surface of the adjustment screw portion 35, the adjustment tongue groove 37 is used for inserting a wrench with a corresponding tenon to rotate the adjustment member 33 to adjust the axial position, the adjustment screw portion 35 is screwed on a flange edge 36 along the axial direction, a lock nut 38 is further screwed on an outer end of the adjustment screw portion 35 to lock the position of the adjustment member 33, grooves corresponding to the positioning end portion 34 and the lock nut 38 are respectively provided on both end surfaces of the flange edge 36, so that most of the positioning end portion 34 and the lock nut 38 are located in the grooves to make the structure more compact, the flange edge 36 is provided on an outer end of the middle layer flow distribution body 24 and an outer end of the inner layer flow distribution body 25, the outer end face of the positioning end portion 34 is allowed to contact the outer end face of the corresponding casing 1 or the outer end face of the middle layer divided fluid 24 to define the mounting position of the middle layer divided fluid 24 or the inner layer divided fluid 25.

An inner die adjusting pipe 26 is arranged in an inner hole of the inner layer shunt body 25 through a spherical bearing pair 20, the spherical bearing pair 20 is positioned at the front part of the inner die adjusting pipe 26, a concave spherical bearing part of the spherical bearing pair 20 is arranged at the front end part of the inner layer shunt body 25, an inner die sleeve 10 is arranged at the front end of the inner die adjusting pipe 26, the inner die sleeve 10 is screwed at the front end of the inner die adjusting pipe 26, an axial positioning adjusting washer 29 is arranged between the inner die sleeve 10 and the inner die adjusting pipe 26, and the axial position of the inner die sleeve 10 can be conveniently changed by adopting the axial positioning adjusting washers 29 with different thicknesses; the rear end of the internal mold adjusting pipe 26 is fixedly connected with the inner-layer shunt body 25 in a centering manner, as a preferred embodiment, the rear end of the inner-layer shunt body 25 is screwed with a centering adjusting screw 3 along the radial direction, at least three positioning adjusting screws 3 are uniformly distributed along the circumferential direction, the rear end of the internal mold adjusting pipe 26 passes through the centering adjusting screw 3 and the inner-layer shunt body 25 in a centering manner, the rear end of the internal mold adjusting pipe 26 is also screwed with a mold adjusting pipe locking nut 28, and the internal mold adjusting pipe locking nut 26 and the inner-layer shunt body 25 can be axially clamped and fixedly connected through the spherical bearing pair 20 by screwing the mold adjusting pipe locking nut 28, so that the internal mold adjusting pipe 26 and the inner-layer shunt body 25 are further ensured to be fixedly connected after being centered.

The outer shunt body 4 is movably inserted into an inner hole of the outer die adjusting seat 2 along the axial direction, an outer die fixing sleeve 12 is arranged at the outer end of the outer shunt body 4, the outer shunt body 4 is pushed outwards under the pressure action of an insulating coating material flowing through an inner taper hole of the outer shunt body 4, so that the outer end face of the outer shunt body is attached to the inner end face of the outer die fixing sleeve 12, the outer die fixing sleeve 12 is fixedly connected with the outer die adjusting seat 2 in an adjustable center mode, as a preferred embodiment, the outer die adjusting seat 2 is rotatably connected with the centering adjusting screws 3 along the radial direction, at least three positioning adjusting screws 3 are uniformly distributed along the circumferential direction, and the outer die fixing sleeve 12 is fixedly connected with the outer die adjusting seat 2 in an adjustable center mode through the centering adjusting screws 3. A positioning sleeve 9 for an external mold fixing sleeve is arranged between the external mold adjusting seat 2 and the external mold fixing sleeve 12, the positioning sleeve 9 for the external mold fixing sleeve is screwed on the external mold adjusting seat 2, and the axial position of the external mold fixing sleeve 12 can be adjusted by rotating the positioning sleeve 9 for the external mold fixing sleeve; an outer die sleeve 5 is arranged in an inner hole of the outer die fixing sleeve 12, an outer die sleeve positioning sleeve 7 is arranged between the outer die fixing sleeve 12 and the outer die sleeve 5, the outer die sleeve positioning sleeve 7 is connected to the outer die fixing sleeve 12 in a rotating mode, and the axial position of the outer die sleeve 5 can be adjusted by rotating the outer die sleeve positioning sleeve 7.

A first annular cavity 6 is arranged between the outer die sleeve 5 and the middle die sleeve 11, the first annular cavity 6 is communicated with a diversion channel 13 on a middle-layer diversion body 24, the diversion channel 13 on the middle-layer diversion body 24 is communicated with a corresponding feeding channel 22 arranged on the machine shell 1, the first annular cavity 6 is also communicated with a diversion channel 13 on an outer-layer diversion body 4, the diversion channel 13 on the outer-layer diversion body 4 is communicated with an outer feeding channel 16 arranged on the outer die adjusting seat 2, a second annular cavity 8 is arranged between the middle die sleeve 11 and the inner die sleeve 10, the second annular cavity 8 is communicated with a diversion channel 13 on an inner-layer diversion body 25, and the diversion channel 13 on the inner-layer diversion body 25 is communicated with the corresponding feeding channel 22 on the machine shell 1 through a through hole on the sleeve wall of the middle-layer diversion body 24.

A plurality of groups of heating units 30 are circumferentially distributed in the casing 1, and each group of heating units 30 is correspondingly provided with at least one temperature sensor (not shown in the figure).

The machine shell 1 is supported on the extrusion head support 42, referring to fig. 5 and 6, a telescopic core rod 44 and at least one middle telescopic rod 43 are movably installed in the extrusion head support 42, the telescopic core rod 44, the middle telescopic rod 43 and the extrusion head support 42 are sequentially sleeved and can be extended and contracted along the axial direction, an inner division fluid support 47 is installed at the extending end of the telescopic core rod 44, the inner division fluid support 47 is connected with the inner division fluid 25, an intermediate division fluid support 48 is installed at the extending end of the middle telescopic rod 43, the intermediate division fluid support 48 is connected with the middle division fluid 24, as a preferred embodiment, the inner hole of the extrusion head support 42 is a rectangular hole, the cross sections of the telescopic core rod 44 and the middle telescopic rod 43 are rectangular, an elastic support outer sleeve 51 is embedded at the outer periphery of the inner end of the telescopic core rod 44 and the outer periphery of the inner end of each middle telescopic rod 43, the outer periphery of the elastic support outer sleeve 51 is attached to the inner hole of the corresponding middle telescopic rod 43 or the inner hole of the corresponding extrusion head support 42, an inner elastic support sleeve 49 is fitted into an inner hole of the outer extension end of the intermediate telescopic rod 43 and an inner hole of the corresponding end of the extrusion head support 42, the inner hole of the inner elastic support sleeve 49 is attached to the outer circumferential surface of the corresponding telescopic core rod 44 or the outer circumferential surface of the corresponding intermediate telescopic rod 43, and the outer elastic support sleeve 51 and the inner elastic support sleeve 49 are preferably rectangular ring-shaped members made of antifriction materials, and are axially split to obtain elasticity and facilitate installation. Referring to fig. 7, the upper portion of the internal division fluid support 47 and the upper portion of the middle division fluid support 48 are fork-shaped, the bottom of the fork-shaped opening is arc-shaped, a plurality of rollers 50 are respectively arranged on the upper portion of the internal division fluid support 47 and the upper portion of the middle division fluid support 48, the rotation axes of the rollers 50 on the internal division fluid support 47 and the middle division fluid support 48 are respectively located on a corresponding circumference, the center of the circumference is located on the axis of the circular arc hole at the bottom of the fork-shaped opening, and the central angle δ corresponding to the left and right rollers 50 located at the fork-shaped opening end is smaller than 180 °; the rollers 50 on the inner dividing fluid support 47 are positioned on the same plane, the rollers 50 on the middle dividing fluid support 48 are positioned on the same plane, the rear ends of the middle layer dividing fluid 24 and the inner layer dividing fluid 25 are respectively provided with a circumferential groove 52 corresponding to the rollers 50, the circumferential grooves 52 are arranged on the periphery of the corresponding flange edge 36, the middle layer dividing fluid 24 is rotatably supported on the middle dividing fluid support 48 through the circumferential grooves 52 and the corresponding rollers 50, the inner layer dividing fluid 25 is rotatably supported on the inner dividing fluid support 47 through the circumferential grooves 52 and the corresponding rollers 50, the rollers 50 are preferably rolling bearings, and the rolling bearings are rotatably supported on the corresponding inner dividing fluid support 47 or the middle dividing fluid support 48 through a mandrel; the upper part of the inner shunt body support 47 is provided with an inner shunt body connecting piece 54, the upper part of the middle shunt body support 48 is provided with a middle shunt body connecting piece 53 to ensure that the connection between the inner shunt body support 47 and the supported inner shunt body 25 and between the middle shunt body support 48 and the supported middle shunt body 24 is reliable when the connection is required, the inner shunt body connecting piece 54 and the middle shunt body connecting piece 53 are inserted on the corresponding inner shunt body support 47 or middle shunt body support 48 in a pin shaft shape, the inner ends of the inner shunt body connecting piece 54 and the middle shunt body connecting piece 53 are provided with connecting threads, the connecting threads are respectively screwed with the corresponding inner shunt body 25 or middle shunt body 24, and the outer ends of the connecting pieces are provided with snap hands to facilitate the screwing operation. The lower end of the internal division fluid support 47 is provided with a card slot which is connected with the telescopic core bar 44 in a card inserting way and is connected with the telescopic core bar 44 through a pin shaft 46 penetrating through two side walls of the card slot, the pin shaft 46 is inserted in a pin shaft elongated slot 45 on the telescopic core bar 44, the length direction of the pin shaft elongated slot 45 is parallel to the telescopic direction of the telescopic core bar 44, the internal division fluid support 47 is fixedly connected with the telescopic core bar 44 through a connecting screw at the front end position of the pin shaft elongated slot 45, the internal division fluid support 47 can be overturned and inverted through the pin shaft 46 at the rear end position of the pin shaft elongated slot 45 and is fixedly connected through the connecting screw, and in order to facilitate the overturning of the internal division fluid support 47, the rear end surface and the upper and lower side surfaces of the telescopic core bar 44 are in fillet transition; the lower end of the middle dividing fluid support 48 is provided with a clamping slot which is connected with a middle telescopic rod 43 in a clamping way and fixedly connected through a connecting screw, the middle telescopic rod 43 connected with the middle dividing fluid support 48 is adjacent to the telescopic core rod 44 under the general condition, the number of the middle telescopic rods 43 is two, and the middle telescopic rods can be determined to be one or three or more according to the different extending lengths of the middle dividing fluid 24 and the different lengths of the middle telescopic rods 43.

The extrusion head support 42 is mounted on a movable seat 41, the movable seat 41 is hinged with the base 39 through a movable support arm 40, see fig. 8, the movable support arm 40 comprises a front support arm 56 and a rear support arm 55, one end of the front support arm 56 is hinged with one end of the rear support arm 55, the movable seat 41 is hinged with the other end of the front support arm 56, the other end of the rear support arm 55 is hinged with the base 39, and the base 39 is fixedly connected with the frame of the extruder.

The above only illustrates some preferred embodiments of the present invention, but the present invention is not limited thereto and many modifications and changes can be made. For example, the external connection seat 14 may not be installed on the same side as the connection seat 23, but the external die adjusting seat 2 may be rotated by 90 degrees to position the external connection seat 14 at an upper position, and the external connection seat 14 is connected to a third extruder, so that production of a three-layer insulated cable may be achieved; instead of the adjusting element 33 comprising the positioning end 34 and the adjusting screw 35, the axial positioning adjusting device 27 may be a universal standard screw screwed directly to the flange 36 instead of the adjusting element 33, or the axial positioning adjusting device 27 may be a positioning sleeve screwed to the flange 36; the cross-sections of the inner hole of the extrusion head support 42 and the intermediate telescopic rod 43 and the telescopic core rod 44 may not be rectangular, but may be circular, and accordingly, guide flat keys may be respectively arranged between the extrusion head support 42 and the intermediate telescopic rod 43, between two adjacent intermediate telescopic rods 43, and between the intermediate telescopic rod 43 and the telescopic core rod 44 to prevent rotation during the telescopic process. Therefore, any modification and variation based on the basic principle of the present invention should be considered as falling within the protection scope of the present invention.

Claims

1. The utility model provides an extruding machine head for aligning coated cables, includes casing (1), outer shunt (4), middle level shunt (24), inner level shunt (25) and sets up feedstock channel (22) on casing (1), installs outer mould die-adjusting seat (2), its characterized in that at the front end of casing (1): a connecting seat (23) is arranged on the casing (1), two feeding channels (21) are arranged on the connecting seat (23), the outlet ends of the two feeding channels (21) are respectively communicated with the corresponding feeding channels (22) on the casing (1), the axis of the inlet end of one feeding channel (21) is obliquely arranged towards the front end of the casing (1), and the axis of the inlet end of the other feeding channel (21) is obliquely arranged towards the rear end of the casing (1); an outer feeding channel (16) is arranged on the outer die adjusting seat (2), an outer connecting seat (14) is arranged on the outer die adjusting seat (2), an outer feeding channel (15) is arranged on the outer connecting seat (14), and the outlet end of the outer feeding channel (15) is communicated with the outer feeding channel (16); the middle-layer shunt body (24) is fixedly connected in an inner taper hole of the machine shell (1), a middle die sleeve (11) is arranged at the front end of the middle-layer shunt body (24), the inner-layer shunt body (25) is installed in the inner taper hole of the middle-layer shunt body (24), an inner die adjusting pipe (26) is installed in an inner hole of the inner-layer shunt body (25) through a spherical surface supporting pair (20), an inner die sleeve (10) is arranged at the front end of the inner die adjusting pipe (26), and the rear end of the inner die adjusting pipe (26) is fixedly connected with the inner-layer shunt body (25) in an adjustable center mode; the outer-layer shunt body (4) is movably inserted into an inner hole of the outer die adjusting seat (2) along the axial direction, an outer die fixing sleeve (12) is arranged at the outer end of the outer-layer shunt body (4), the outer die fixing sleeve (12) is fixedly connected with the outer die adjusting seat (2) in an adjustable center mode, and an outer die sleeve (5) is arranged in the inner hole of the outer die fixing sleeve (12); a first ring cavity (6) is arranged between the outer die sleeve (5) and the middle die sleeve (11), the first ring cavity (6) is communicated with a shunt groove (13) on the middle-layer shunt body (24), the shunt groove (13) on the middle-layer shunt body (24) is communicated with a corresponding feeding channel (22) arranged on the machine shell (1), the first ring cavity (6) is also communicated with a shunt groove (13) on the outer-layer shunt body (4), the shunt groove (13) on the outer-layer shunt body (4) is communicated with an outer feeding channel (16) arranged on the outer die adjusting seat (2), a second annular cavity (8) is arranged between the middle mold sleeve (11) and the inner mold sleeve (10), the second annular cavity (8) is communicated with a shunt groove (13) on the inner-layer shunt body (25), and the shunt groove (13) on the inner-layer shunt body (25) is communicated with a corresponding feeding channel (22) on the machine shell (1) through a through hole on the sleeve wall of the middle-layer shunt body (24); a plurality of heating units (30) are circumferentially distributed in the machine shell (1), and each group of heating units (30) is correspondingly provided with at least one temperature sensor; the machine shell (1) is supported on an extrusion head support (42), a telescopic core rod (44) and at least one middle telescopic rod (43) are movably mounted in the extrusion head support (42), the telescopic core rod (44) and the middle telescopic rod (43) are sequentially sleeved with the extrusion head support (42) and can axially extend and retract, an inner division fluid support (47) is mounted at the extending end of the telescopic core rod (44), the inner division fluid support (47) is connected with the inner layer flow distribution body (25), a middle division fluid support (48) is mounted at the extending end of the middle telescopic rod (43), and the middle division fluid support (48) is connected with the middle layer flow distribution body (24); the extrusion head support (42) is arranged on a movable seat (41), and the movable seat (41) is hinged with the base (39) through a movable support arm (40).

2. The self-aligning covered cable extruder head of claim 1, wherein: the included angle alpha between the axis of the inlet end of one feeding channel (21) and the axis of the machine shell (1) is 40-60 degrees, and the included angle beta between the axis of the inlet end of the other feeding channel (21) and the axis of the machine shell (1) is 40-60 degrees; the axial line of the inlet end of the outer feeding channel (15) is obliquely arranged towards the front end of the outer die adjusting seat (2), and the included angle gamma between the axial line of the inlet end of the outer feeding channel (15) and the axial line of the shell (1) is 40-60 degrees; the feeding device is characterized in that a feeding switching valve core (17) is arranged in each of the feeding channel (21) and the outer feeding channel (15), a main feeding channel (31) and a bypass channel (32) are arranged on the feeding switching valve core (17), the inlet end of the feeding channel (21) is communicated with the outlet end of the feeding channel (21) through the main feeding channel (31), the inlet end of the feeding channel (21) is communicated with the outside of the connecting seat (23) through the bypass channel (32), the inlet end of the outer feeding channel (15) is communicated with the outlet end of the outer feeding channel (15) through the main feeding channel (31), and the inlet end of the outer feeding channel (15) is communicated with the outside of the outer connecting seat (14) through the bypass channel (32).

3. The self-aligning covered cable extruder head of claim 1, wherein: the periphery of the middle-layer shunt body (24) is attached to an inner conical hole of the machine shell (1), an axial positioning adjusting device (27) is arranged between the rear end of the middle-layer shunt body (24) and the machine shell (1), the periphery of the inner-layer shunt body (25) is attached to the inner conical hole of the middle-layer shunt body (24), and the axial positioning adjusting device (27) is arranged between the rear end of the inner-layer shunt body (25) and the middle-layer shunt body (24); axial positioning adjusting device (27) is including regulating part (33), this regulating part (33) is including location tip (34) and adjusting screw portion (35), be equipped with at the terminal surface of adjusting screw portion (35) and adjust tongue-and-groove (37), adjusting screw portion (35) along the axial revolve connect on flange limit (36), still revolve at adjusting screw portion (35) outer end and connect lock nut (38), be equipped with the recess that corresponds with location tip (34) and lock nut (38) on flange limit (36) both ends face respectively, flange limit (36) set up in the outer end of middle level reposition of redundant personnel (24) and the outer end of inlayer reposition of redundant personnel (25).

4. The self-aligning covered cable extruder head of claim 1, wherein: the inner die sleeve (10) is screwed at the front end of the inner die adjusting pipe (26), and an axial positioning adjusting washer (29) is arranged between the inner die sleeve (10) and the inner die adjusting pipe (26).

5. The self-aligning covered cable extruder head of claim 1, wherein: a positioning sleeve (9) for the outer mold fixing sleeve is arranged between the outer mold adjusting seat (2) and the outer mold fixing sleeve (12), the positioning sleeve (9) for the outer mold fixing sleeve is screwed on the outer mold adjusting seat (2), a positioning sleeve (7) for the outer mold sleeve is arranged between the outer mold fixing sleeve (12) and the outer mold sleeve (5), and the positioning sleeve (7) for the outer mold sleeve is screwed on the outer mold fixing sleeve (12).

6. The self-aligning covered cable extruder head of claim 1, wherein: the rear end of the inner-layer shunt body (25) is screwed with centering adjusting screws (3) along the radial direction, at least three centering adjusting screws (3) are uniformly distributed along the circumferential direction, and the rear end of the inner-mold adjusting pipe (26) is fixedly connected with the inner-layer shunt body (25) in an adjustable centering way through the centering adjusting screws (3); the outer die adjusting seat (2) is screwed with centering adjusting screws (3) along the radial direction, at least three centering adjusting screws (3) are uniformly distributed along the circumferential direction, and an outer die fixing sleeve (12) is fixedly connected with the outer die adjusting seat (2) in a centering manner through the centering adjusting screws (3).

7. The self-aligning covered cable extruder head of claim 1, wherein: the cross sections of the telescopic core rod (44) and the middle telescopic rod (43) are rectangular, an elastic supporting outer sleeve (51) is embedded in the outer periphery of the inner end of the telescopic core rod (44) and the outer periphery of the inner end of the middle telescopic rod (43), the outer peripheral surface of the elastic supporting outer sleeve (51) is attached to the inner hole of the corresponding middle telescopic rod (43) or the inner hole of the corresponding extrusion head support (42), an elastic supporting inner sleeve (49) is embedded in the inner hole of the extending end of the middle telescopic rod (43) and the inner hole of the corresponding extrusion head support (42), and the inner hole of the elastic supporting inner sleeve (49) is attached to the outer peripheral surface of the corresponding telescopic core rod (44) or the outer peripheral surface of the corresponding middle telescopic rod (43).

8. The self-aligning covered cable extruder head of claim 1, wherein: the upper part of the inner division fluid support (47) and the upper part of the middle division fluid support (48) are fork-shaped, a plurality of rollers (50) are respectively arranged on the upper part of the inner division fluid support (47) and the upper part of the middle division fluid support (48), the rotating axes of the rollers (50) of the inner division fluid support (47) and the middle division fluid support (48) are respectively positioned on a corresponding circumference, the center of the circumference is positioned on the axis of the arc hole at the fork-shaped opening, and the central angle delta corresponding to the left and right rollers (50) positioned at the fork-shaped opening end is smaller than 180 degrees; the rollers (50) on the inner shunting body support (47) are positioned on the same plane, the rollers (50) on the middle shunting body support (48) are positioned on the same plane, the rear ends of the middle-layer shunting body (24) and the inner-layer shunting body (25) are respectively provided with a circumferential groove (52) corresponding to the rollers (50), the middle-layer shunting body (24) can be rotatably supported on the middle shunting body support (48) through the circumferential groove (52) and the corresponding roller (50), and the inner-layer shunting body (25) can be rotatably supported on the inner shunting body support (47) through the circumferential groove (52) and the corresponding roller (50).

9. The self-aligning covered cable extruder head of claim 1 or 8, wherein: the lower end of the internal division fluid support (47) is connected with the telescopic core rod (44) through a pin shaft (46), the pin shaft (46) is inserted into a pin shaft elongated slot (45) on the telescopic core rod (44), the length direction of the pin shaft elongated slot (45) is parallel to the telescopic direction of the telescopic core rod (44), the internal division fluid support (47) can be fixedly connected with the telescopic core rod (44) at the front end position of the pin shaft elongated slot (45), and the internal division fluid support (47) can be overturned, inverted and fixedly connected at the rear end position of the pin shaft elongated slot (45) through the pin shaft (46); the lower end of the middle dividing fluid support (48) is fixedly connected with the middle telescopic rod (43).

10. The self-aligning covered cable extruder head of claim 1, wherein: the movable support arm (40) comprises a front support arm (56) and a rear support arm (55), one end of the front support arm (56) is hinged with one end of the rear support arm (55), the movable base (41) is hinged with the other end of the front support arm (56), and the other end of the rear support arm (55) is hinged with the base (39).