CN212949095U - Special extrusion molding mould of fire-retardant optical cable - Google Patents
Special extrusion molding mould of fire-retardant optical cable Download PDFInfo
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- CN212949095U CN212949095U CN202021166040.0U CN202021166040U CN212949095U CN 212949095 U CN212949095 U CN 212949095U CN 202021166040 U CN202021166040 U CN 202021166040U CN 212949095 U CN212949095 U CN 212949095U
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Abstract
The utility model relates to a special extrusion molding mould of fire-retardant optical cable, including die sleeve (2) and mold core (1), be equipped with the toper hole in die sleeve (2), die sleeve (2) one end is provided with cable cover reducing mouth (5), and die sleeve (2) side is provided with one locating hole (3), mold core (1) have with die sleeve (2) toper hole complex circular cone water conservancy diversion face (7), both sides all are provided with grade hole (4) of deciding of four equidistant distributions about circular cone water conservancy diversion face (7), and mold core (1) are close to die sleeve (2) shaping die mouth one side and are provided with cable core reducing mouth (6), cable cover reducing mouth (5), cable core reducing mouth (6) assemble in mold core (1) a circular cone cavity (8). The utility model discloses thereby can the fluctuation of stable control extrusion molding pressure reduction optical cable wall thickness, and then reduce quality cost, it is extravagant to reduce the material that excessive production caused, exempts from to transfer core, indentation distance gear adjustment simultaneously and can shorten the remodelling time by a wide margin, improve equipment opening rate.
Description
Technical Field
The utility model relates to a communication optical cable makes forming technology, especially a special extrusion molding mould of fire-retardant optical cable.
Background
The communication life line of the country and the society of communication optical cable security affairs is the foundation of the information society, and the flame-retardant optical cable is a form derived from the communication optical cable and is widely applied to indoor comprehensive wiring, electric power communication, airplanes, ships, mines, subways, light rails, special communication places where fires easily occur and the like. In addition to ensuring the transmission and mechanical properties of the optical cable, the most important of the occasions are the requirements of flame retardant property. The flame-retardant property of the flame-retardant optical cable is different from the use of the conventional optical cable which is mainly made of a sheath material, and the innovative scheme designs an extrusion molding die specially used for producing the flame-retardant optical cable.
Due to the obvious difference between the flame retardant and the conventional PE material, if the conventional optical cable production process is carried to the production process of the flame retardant optical cable, a plurality of quality problems can occur, which mainly show that the fluctuation of the outer diameter and the wall thickness of the flame retardant optical cable is large, the production speed is limited, high-speed production cannot be carried out, the adhesion between the flame retardant and the composite tape is not firm, and the like, and the following problems which often occur in the production process of the flame retardant optical cable protective layer by using several conventional dies are listed:
drawing a tube type die: the stretching ratio of the retardant is obviously different from that of the conventional PE material, when the pull pipe type die is used, the pressure of the retardant in a diameter forming area of the pull pipe type die is unstable, the wire diameter fluctuation of a finished product is large, and the condition that the protective layer and the composite belt are not firmly bonded can occur during production of the outer protective layer.
Extruding die: the extrusion type die has no buffer area in the molding process, although the extrusion type die has the advantages of stable wire diameter and direct and firm bonding of the protective layer and the composite tape; but has the disadvantages that the extrusion pressure is too high and the production speed is limited; and when the mould is changed, the core deviation adjustment is difficult, and the production efficiency is seriously influenced.
Semi-extrusion type die: the advantages of the two moulds are combined, but the defects of the two moulds cannot be completely covered; the wire diameter control is limited by the size of the die sleeve, and the requirement on die matching is high; the die sleeve and the pull tube type die sleeve are difficult to distinguish, and the management pressure is large.
In the current production process of the flame-retardant optical cable protective layer, a mold type which has the advantages of the molds and can effectively avoid quality abnormity is urgently needed, and the stability of extrusion amount of the flame-retardant material can be effectively improved, so that the fluctuation of the wire diameter is minimum; the extrusion pressure is stable and controllable; the peeling strength between the protective layer and the composite belt can be adjusted according to the product requirements; the mold core and the mold sleeve are fixed in position, the adjustment and the core deviation are avoided, the mold is quickly changed, the production preparation time is shortened, and the starting rate of equipment is improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming, provide a undulant little, exempt from to transfer inclined to one side core of line diameter, quick retooling's fire-retardant optical cable extrusion molding mould.
The purpose of the utility model is realized through the following technical scheme: the utility model provides a special extrusion molding mould of fire-retardant optical cable, includes die sleeve and mold core, be equipped with the toper hole in the die sleeve, die sleeve one end is provided with cable cover reducing mouth, and the die sleeve side is provided with a locating hole, the mold core have with die sleeve toper hole complex circular cone water conservancy diversion face, both sides all are provided with four equidistant grade holes that decide of distributing about the circular cone water conservancy diversion face, and the mold core is close to die sleeve shaping die mouth one side and is provided with cable core reducing mouth, cable core reducing mouth assembles a circular cone cavity in the mold core.
The small end of the conical cavity in the mold core is connected with a cable core diameter forming port, the cable sleeve diameter forming port and the center of the conical cavity are positioned on the same horizontal line, and the cable core diameter forming port and the cable sleeve diameter forming port are circular holes.
The cable core diameter forming opening length range is 3.45mm-3.55mm, the outer diameter of the cross section of the mold core is increased by 0.3mm-0.7mm on the outer diameter of the sizing mold, the cable sleeve diameter forming opening length range is 1.45mm-1.55mm, and the outer diameter of the cross section of the mold sleeve is increased by 0.5mm-0.8mm on the basis of the required outer diameter of the optical cable.
The distance of the cable core reducing end face retracted into the cable sleeve reducing end face is variable and corresponds to four retaining holes in the conical diversion surface of the mold core, and the retracting distance is 0mm, 4mm, 8mm and 10mm in sequence.
The mold core feed inlet one end is provided with accurate screw thread end to be equipped with backflow prevention step type seal segment between accurate screw thread end and circular cone water conservancy diversion face, backflow prevention step type seal segment diameter is less than circular cone water conservancy diversion face diameter.
The utility model can stably control the extrusion molding pressure so as to reduce the fluctuation of the wall thickness of the optical cable, and the stability of the diameter of the inner protection wire can ensure that the quality abnormity caused by the size of the inner protection wire can not occur during the production of the outer protection wire, thereby effectively reducing the quality cost; the stable wall thickness can also reduce the specification boundary of the product process, and reduce the material waste caused by over production; meanwhile, the adjustment of the eccentric core and the adjustment of the indentation distance gear are not needed, so that the time for changing the model can be greatly shortened, and the opening rate of the equipment is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-mold core, 2-mold sleeve, 3-positioning hole, 4-stopping hole, 5-cable sleeve diameter forming opening, 6-cable core diameter forming opening, 7-conical flow guide surface, 8-conical cavity, 9-precision thread end and 10-step type sealing section.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.
As shown in fig. 1, a special extrusion molding mould of fire-retardant optical cable, including die sleeve 2 and mold core 1, be equipped with the toper hole in the die sleeve 2, 2 one ends of die sleeve are provided with cable cover reducing mouth 5, and 2 sides of die sleeve are provided with a locating hole 3, mold core 1 have with 2 toper hole complex circular cone water conservancy diversion faces 7 of die sleeve, circular cone water conservancy diversion face 7 upper and lower both sides all are provided with four equidistant fixed gear holes 4 that distribute, and mold core 1 is close to 2 shaping die mouths one side of die sleeve and is provided with cable core reducing mouth 6, cable core reducing mouth 6 assembles in the mold core 1 in a circular cone cavity 8.
Adopt above-mentioned structure to make 2 shaping materials of die sleeve flow to cable cover reducing mouth 5 through circular cone water conservancy diversion face 7, and simple extrusion is carried out through cable core reducing mouth 6 to 1 shaping materials of mold core through circular cone cavity 8, and 2 shaping materials of die sleeve and 1 shaping materials of mold core begin to bond between cable cover reducing mouth 5 and cable core reducing mouth 6, make core sleeve and heart yearn fully bond this process of completion extrusion molding through cable cover reducing mouth 5.
The small end of the conical cavity 8 in the mold core 1 is connected with a cable core diameter forming port 6, the cable sleeve diameter forming port 5 and the center of the conical cavity 8 are positioned on the same horizontal line, and the cable core diameter forming port 6 and the cable sleeve diameter forming port 5 are circular holes.
The length of the cable core diameter forming port 6 can be within a range of 3.45-3.55 mm, the pressure of the cable core in the flow channel is gradually increased, the length of the cable core diameter forming port 6 is controlled, unstable extrusion pressure caused by a longer forming area is avoided, and the cable core diameter forming port is more suitable for the requirement of the stretching ratio of the flame-retardant special material. The outer diameter of the section of the mold core 1 is increased by 0.3mm-0.7mm on the outer diameter of the sizing mold, so that the problems that the requirement for centering a production line is too high due to the undersize of the section of the mold core 1, the mold core 1 and an aluminum strip structure are easily scraped, and even a composite strip is damaged are solved, and the problems that cable cores shake in cavities in the production process due to the overlarge size, and the conditions of wire diameter fluctuation, core deviation and the like are caused are solved.
The length of the cable sleeve diameter forming port 5 can be within the range of 1.45-1.55 mm, the length of the cable sleeve diameter forming port 5 is controlled, risks of backflow of the fuel resistance at the tail end of a runner due to overlarge pressure, casting at the die sleeve 2 and the like are reduced, the pressure of the fuel resistance is released to a certain extent at the position, and the bonding strength between the protective layer and the composite belt can be guaranteed by the residual pressure. The outer diameter of the cross section of the die sleeve 2 is increased by 0.5mm-0.8mm on the basis of the required outer diameter of the optical cable, so that the problem that the pressure in the machine head is too large due to the too small size of the die sleeve 2 to cause the risk of material return is avoided, and the problem that the optical cable is abnormal in large and small diameter, block wrapping, material stripping and the like due to the too large size of the die sleeve 2 is avoided.
The mold core is characterized in that a precise threaded end 9 is arranged at one end of a feed inlet of the mold core 1, a backflow-preventing stepped sealing section 10 is arranged between the precise threaded end 9 and the conical flow guide surface 7, and the diameter of the backflow-preventing stepped sealing section 10 is smaller than that of the conical flow guide surface 7.
The retraction distance between the mold core 1 and the mold sleeve 2 is adjustable, and the 4 gears are adjustable and correspondingly retracted by 0mm, 4mm, 8mm and 10mm respectively; the die core 1 indentation adjusting device is suitable for indentation adjustment of the die core 1 under the steel wire cushion layer, the inner protective layer, the outer protective layer and different extrusion molding wall thicknesses. The gear setting method is to adjust the position of a positioning screw at the joint of the die sleeve 2 and the die core 1, and the position of each group of positioning holes 3 corresponds to a plurality of actual gears for retracting the die core 1; accomplish mold core 1 and 2 cross-sectional positions of die sleeve when gear is adjusted and fix, exempt from to transfer during the remodeling and incline the core, effectively avoid traditional extrusion die to adjust the problem of difficulty at production in-process core deviation, the remodeling fast reduces production preparation time, improve equipment and open the percent.
The working process of the utility model is as follows: when the production of the optical cable with one specification is finished, the machine needs to be stopped for carrying out the model changing work; before the operation, the innovative die is adjusted to the required gear of the production specification, the retraction distance of the die core 1 is determined, the installation of the positioning bolt is completed, after the operation is started, the blocking fuel is injected from the conical flow guide surface 7 of the die core 1 to gather energy in the buffering process, meanwhile, the cable core wire is fully bonded with the cable core wire through the cable core diameter forming opening 5 molten material of the cable sleeve diameter forming opening 6 through the conical cavity 8 of the die core 1, and the flame-retardant optical cable is formed at the set speed.
Claims (5)
1. The utility model provides a special extrusion molding mould of fire-retardant optical cable which characterized in that: including die sleeve (2) and mold core (1), be equipped with the toper hole in die sleeve (2), die sleeve (2) one end is provided with cable cover reducing mouth (5), and die sleeve (2) side is provided with a locating hole (3), mold core (1) have with die sleeve (2) toper hole complex circular cone water conservancy diversion face (7), circular cone water conservancy diversion face (7) upper and lower both sides all are provided with grade hole (4) of deciding of four equidistant distributions, and mold core (1) are close to die sleeve (2) shaping die mouth one side and are provided with cable core reducing mouth (6), cable core reducing mouth (6) assemble in mold core (1) a circular cone cavity (8).
2. The extrusion molding die special for the flame-retardant optical cable according to claim 1, wherein: the small end of the conical cavity (8) in the mold core (1) is connected with a cable core diameter forming port (6), and the cable core diameter forming port (6), the cable sleeve diameter forming port (5) and the center of the conical cavity (8) are positioned on the same horizontal line.
3. The extrusion molding die special for the flame-retardant optical cable according to claim 1, wherein: the length of the cable core diameter forming port (6) can be within a range of 3.45-3.55 mm, the outer diameter of the cross section of the mold core (1) is increased by 0.3-0.7 mm on the outer diameter of the sizing mold, the length of the cable sleeve diameter forming port (5) can be within a range of 1.45-1.55 mm, and the outer diameter of the cross section of the mold sleeve (2) is increased by 0.5-0.8 mm on the basis of the required outer diameter of the optical cable.
4. The extrusion molding die special for the flame-retardant optical cable according to claim 1, wherein: the distance between the end surface of the cable core diameter forming port (6) and the end surface of the cable sleeve diameter forming port (5) is variable and corresponds to four retaining holes (4) on a conical flow guide surface (7) of the mold core (1), and the retracting distance is 0mm, 4mm, 8mm and 10mm in sequence.
5. The extrusion molding die special for the flame-retardant optical cable according to claim 1, wherein: the mold core (1) feed inlet one end is provided with accurate screw thread end (9) to be equipped with anti-return step type seal section (10) between accurate screw thread end (9) and circular cone water conservancy diversion face (7), anti-return step type seal section (10) diameter is less than circular cone water conservancy diversion face (7) diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021166040.0U CN212949095U (en) | 2020-06-22 | 2020-06-22 | Special extrusion molding mould of fire-retardant optical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021166040.0U CN212949095U (en) | 2020-06-22 | 2020-06-22 | Special extrusion molding mould of fire-retardant optical cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212949095U true CN212949095U (en) | 2021-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021166040.0U Active CN212949095U (en) | 2020-06-22 | 2020-06-22 | Special extrusion molding mould of fire-retardant optical cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212949095U (en) |
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2020
- 2020-06-22 CN CN202021166040.0U patent/CN212949095U/en active Active
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