CN217719146U - Doubling die for preparing semicircular cable cores - Google Patents
Doubling die for preparing semicircular cable cores Download PDFInfo
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- CN217719146U CN217719146U CN202221857164.2U CN202221857164U CN217719146U CN 217719146 U CN217719146 U CN 217719146U CN 202221857164 U CN202221857164 U CN 202221857164U CN 217719146 U CN217719146 U CN 217719146U
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Abstract
The utility model discloses a doubling mould for preparing semicircle cable core, including the body and run through the doubling bullport of body, the doubling bullport includes first entry section and first export section, and the hole profile of first export section is by first chord, first arc, the second arc, the third arc is constituteed, first chord and first arc mutual disposition, and the one end of first chord is passed through the second arc and is connected with the one end of first arc, and the other end of first chord passes through the third arc and is connected with the other end of first arc, and the maximum distance between first chord and the first arc is less than half of first chord length. The utility model has the characteristics of prevent that the metal monofilament from splitting and reduce manufacturing cost.
Description
Technical Field
The utility model relates to a cable technical field, concretely relates to doubling mould for preparing semicircle cable core.
Background
CN105448413B discloses a manufacturing method of a semicircular conductor power cable, which comprises the following steps: 1) Pressing the twisted conductor into a semicircular shape through a roller die; 2) Wrapping the insulating material outside the conductor by adopting an extrusion wrapping mode, and cooling; 3) Stranding two identical wire cores prepared in the steps 1) and 2) and a filling material to form a cable core; 4) Wrapping a first layer of wrapping tape; 5) Wrapping the inner sheath material outside the first layer of wrapping tape in an extrusion manner; 6) The inner sheath material is armored by a metal armor layer; 7) Wrapping a second layer of wrapping tape outside the metal armor layer; 8) And extruding the outer sheath material to the outside of the second lapping tape in an extruding mode, so as to obtain the semicircular conductor power cable shown in the figure 1.
Wherein, the specific process of the step 1) is as follows: for any conductor, a plurality of metal monofilaments are stranded to form the conductor; the metal monofilament is divided into a plurality of layers from inside to outside; two adjacent metal monofilaments in each layer of metal monofilaments are tightly attached to each other; in the two adjacent layers of metal monofilaments, the inner layer metal monofilament and the outer layer metal monofilament are tightly attached; and pressing the twisted conductor into a semicircular shape through a roller die.
The manufacturing method of the semicircular conductor power cable has the following defects:
(1) The method has the problems that the section of the conductor formed by twisting a plurality of metal monofilaments is circular, gaps exist among the twisted metal wires before roller pressing, a part of the gaps are filled by the metal monofilaments in the pressing process to cause broken wires, in the process of forming the semicircle, the semicircle is formed by chords, arcs, connecting chords and arcs and has round corners, the metal monofilaments at the round corners are deformed in the pressing process and cannot be matched with the die due to stress, so that the round corners of the formed semicircle conductor have burrs, due to the existence of the burrs, after the insulation layer is extruded on the peripheral surface of the semicircle conductor, the thickness of the insulation layer corresponding to the burrs is thin, the burrs have the hidden danger of cutting the insulation layer, the semicircular conductor needs to be detected through a spark machine after the insulation layer is extruded, and in the detection process, the insulation layer corresponding to the burrs is easy to be broken by voltage.
(2) The existing semi-circular conductor adopts a pressing mode to determine that the pitch of the twisted metal monofilaments cannot be too large, and the specific reason is that if the pitch is too large, the twisted conductor is loosened, becomes loosened in the pressing process and cannot be tightly combined into a whole, and the twisted pitch of the twisted single conductor for pressing is calculated to be 10-15 times of the twisted outer diameter, so that under the condition of the small twisted pitch, the needed raw materials are increased, and the cost of the twisted single conductor is higher.
(3) In the pressing process, the twisted single conductor is affected by the pressing process, such as unstable pressure, or poor matching of the precision of the die and the threading speed, etc., which causes inconsistent deformation of each part, resulting in large deviation of resistance phase of each part, and when current flows through the semicircular conductor, the fluctuation of the formed electric signal is large, thus resulting in poor steady-state performance of the electric signal.
SUMMERY OF THE UTILITY MODEL
The utility model provides a doubling mould for preparing semicircle cable core, the utility model has the characteristics of prevent that the metal monofilament from splitting and reducing manufacturing cost.
The technical scheme for solving the technical problems is as follows:
the doubling die for preparing the semicircular cable core comprises a body and a doubling guide hole penetrating through the body, wherein the doubling guide hole comprises a first inlet section and a first outlet section, the inner hole profile of the first outlet section consists of a first chord, a first arc, a second arc and a third arc, the first chord and the first arc are arranged oppositely, one end of the first chord is connected with one end of the first arc through the second arc, the other end of the first chord is connected with the other end of the first arc through the third arc, and the maximum distance between the first chord and the first arc is smaller than half of the chord length of the first chord.
The utility model has the advantages of as follows:
(1) The utility model discloses need not adopt the roll mould to suppress the stranded conductor, although the stranded conductor has received first extrusion tooling extrusion passively, however, such extrusion makes the stranded conductor disperse the back and is used for filling the space between two adjacent stranded conductors and the first extrusion tooling, and the cross-section semicircular in shape of final all conductor constitutions, therefore, can not lead to the metal filament fracture like among the prior art, more can not form the overlap on every stranded conductor, and then avoided the weak that the stranded conductor caused the first insulation layer, therefore, the first insulation layer of extruding forms even state at the thickness at each position in this embodiment.
(2) Adopt the utility model discloses a mould for the transposition pitch of stranded conductor is far greater than prior art, consequently, on the one hand the utility model discloses a metal monofilament's volume is less than prior art far away to the cost is reduced, on the other hand, after having increased the transposition pitch, mainly be in order to play the effect in dispersion and filling the space when through first extrusion tooling, the condition of avoiding disconnected silk takes place simultaneously.
(3) Because, because the utility model discloses a method need not the suppression just can form for the semicircle to the stranded conductor, consequently, after shaping semicircle cable core, every metal monofilament has all kept original form, like this for the resistance at each position of cable core equals or is very close, in concrete use, has avoided causing undulantly because of the factor of cable core to the signal of telecommunication.
To sum up, the utility model discloses compare with the power cable manufacturing method that publication number CN105448413B disclosed, the utility model discloses a method is under the requirement of realizing the same function and performance, more saves conductor material, and conductor resistance better controls, more does benefit to mass production, and conductor reuse, insulating layer puncture is very few, advantage that the defective percentage is very low.
Drawings
Fig. 1 is a schematic view of a production line of the semicircular cable core of the present invention;
FIG. 2 is a cross-sectional view of a doubling die;
FIG. 3 is a right side view of FIG. 2;
FIG. 4 is a schematic view of the inner profile of the first outlet section;
FIG. 5 is a schematic view of a stranded conductor as it passes through the first outlet section in cooperation with the first outlet section;
FIG. 6 is a half sectional view of a first extrusion die;
FIG. 7 is a top view of FIG. 6;
FIG. 8 is a cross-sectional view of a semicircular cable core;
FIG. 9 is a cross-sectional view of a communication cable;
reference numbers in the drawings:
the cable drawing device comprises a first stranded conductor 1, a second stranded conductor 2, a doubling mold 3, a body 30, a doubling guide hole 31, a first inlet section 31a, a first outlet section 31b, a first chord 3a, a first arc 3b, a second arc 3c, a third arc 3d, a first central angle alpha, a second central angle beta, a first extrusion mold 4, an outlet section 4a, a first insulating layer 5, a first pay-off rack 6, a second pay-off rack 7, a third pay-off rack 8, a tension rack 9, a take-up rack 10, a semicircular cable core 11, a vacuumizing device 12, a first water tank 13, a second water tank 14, a wrapping layer 15, a metal woven layer 16 and an outer sheath 17.
Detailed Description
As shown in fig. 1, the utility model discloses a production line of semicircle cable core, including pay off rack, the cooling device who is used for rolling stranded conductor, doubling mould 3, first extrusion tooling 4, the following is to each part and the relation between each part carries out the detailed description:
in this embodiment, a plurality of metal monofilaments are twisted to form a twisted conductor, the twisted conductor includes a first twisted conductor 1 and a second twisted conductor 2, the outer diameters of the first twisted conductor 1 and the second twisted conductor 2 are not equal, the number of the first twisted conductors 1 is two, and the number of the second twisted conductor 2 is one.
The multiple stranded conductors move in parallel along the doubling mold 3, and the doubling mold 3 is positioned at the downstream of the pay-off rack; a tension frame 9 is arranged between the pay-off rack and the doubling mold 3, in this embodiment, the pay-off rack includes a first pay-off rack 6, a second pay-off rack 7 and a third pay-off rack 8, the first twisted conductor 1 is wound on the first pay-off rack 6, the second twisted conductor 2 is wound on the second pay-off rack 7, the second first twisted conductor 1 is wound on the third pay-off rack 8, and the first twisted conductor 1 and the second twisted conductor 2 respectively paid off from the first pay-off rack 6 and the third pay-off rack 8 and the second twisted conductor 2 paid off from the second pay-off rack 7 are respectively tensioned by the tension frame 9 and then sent into the doubling mold 3.
In this embodiment, since the plurality of stranded conductors move in parallel, the movement of each stranded conductor is stabilized by the tensioning action of the tension bracket 9 and the guiding action of the doubling mold 3, so that the adjacent stranded conductors are prevented from shifting or interfering and being stuck with the doubling mold 3, and the cross-sectional shapes of the stranded conductors are close to the cross-sectional shape of the doubling mold 3 after the stranded conductors are output from the doubling mold 3.
The doubling die 3 comprises a body 30 and a doubling guide hole 31 penetrating through the body 30, the doubling guide hole 31 comprises a first inlet section 31a and a first outlet section 31b, the first inlet section 31a is a taper hole, the diameter of the input end of the first inlet section 31a is larger than the diameter of the joint of the first inlet section 31a and the first outlet section 31b, and the first inlet section 31a is provided with a tapered hole, so that the formation and guide of each twisted conductor into the first outlet section 31b can be facilitated.
The inner hole profile of the first outlet section 31b is composed of a first chord 3a, a first arc 3b, a second arc 3c and a third arc 3d, the first chord 3a is arranged opposite to the first arc 3b, one end of the first chord 3a is connected with one end of the first arc 3b through the second arc 3c, the other end of the first chord 3a is connected with the other end of the first arc 3b through the third arc 3d, and the maximum distance H between the first chord 3a and the first arc 3b is smaller than half of the chord length of the first chord 3 a.
Since the maximum distance H between the first chord 3a and the first arc 3b is smaller than half of the first chord 3a, for example, half of the first chord 3a is 1.04-1.13 times of the maximum distance H, the inner bore profile of the first outlet section 31b is not a semicircle but is close to a semicircle, and the first outlet section 31b has a binding effect on the plurality of twisted conductors, so that the twisting die 3 effectively forms a binding on the twisted conductors after the twisted conductors pass through the twisting die 3, and the cross-sectional shape of the plurality of twisted conductors after being arranged is close to a semicircle. In addition, since the stranded conductor is respectively matched with the second arc 3c and the third arc 3d or slides along the second arc 3c and the third arc 3d when passing through the doubling mold 3, the second arc 3c and the third arc 3d are respectively used for connecting the first chord 3a and the first arc 3b, and the round shapes of the second arc 3c and the third arc 3d are matched with the peripheral surface of the stranded conductor, so that the stranded conductor can be prevented from being scratched.
In this embodiment, the second arc 3c and the third arc 3d are preferably arranged to be mirror-symmetric to each other, the first central angle α corresponding to the first arc 3b is smaller than the second central angle β corresponding to the second arc 3c and the third arc 3d, the first central angle α is an acute angle, and the second central angle β is an obtuse angle, in this embodiment, the first central angle α is preferably 82 ° and the second central angle β is preferably 138 °, so that the arc length of the first arc 3b is smaller than the arc length of a quarter of the circle corresponding to the first arc 3b, the arc length of the second arc 3c is smaller than the arc length of a semicircle corresponding to the second arc 3c, and the arc length of the third arc 3d is smaller than the arc length of a semicircle corresponding to the third arc 3 d.
The foregoing describes the central angles of the first arc 3b, the second arc 3c, and the third arc 3d, and the relationship between the arc lengths of the first arc 3b and the second arc 3c, and the third arc 3d, by which it is further clear that the inner bore profile of the first outlet section 31b is not a semicircle, but is close to a semicircle.
The first extrusion die 4 is used for extruding the stranded conductor and the insulating material together, the first extrusion die 4 is located at the downstream of the doubling die 3 and at the upstream of the cooling device, an outlet section used for enabling at least one part of the stranded conductor to be scattered is arranged on the first extrusion die 4, an inner hole of the outlet section is semicircular, and a taper hole is also adopted in the inlet section of the first extrusion die 4.
In this embodiment, it is preferable that the area of the first outlet section 31b of the doubling die 3 is larger than the area of the outlet section 4a of the first extrusion die 4, and the diameter of the outlet section of the first extrusion die 4 is smaller than the chord length of the first outlet section 31 b. Therefore, the strand conductor is pressed by the outlet section 4a of the first extrusion die 4, facilitating spreading of at least a portion of the strand conductor.
In the present embodiment, since the twisted conductors have a relatively large twisting pitch, the twisted conductors in the present embodiment are less compact than the twisted conductors in the prior art, and therefore easily spread after being subjected to a corresponding pressing force, in the present embodiment, the area of the first outlet section 31b of the doubling mold 3 is greater than the area of the outlet section 4a of the first extrusion mold 4, the twisted conductors pass through the doubling mold 3 first, and are bundled while passing through the doubling mold 3, the twisted conductors are arranged and then the cross-sectional shape formed by the twisted conductors together is close to a semicircle, but the twisted conductors do not receive a large pressing force when passing through the doubling mold 3, and when the twisted conductors reach the outlet section 4a of the first extrusion mold 4, at least a portion of the twisted conductors are spread due to the area of the outlet section 4a of the first extrusion mold 4 being reduced relative to the area of the first outlet section 31b of the doubling mold 3, and the inner wall surfaces of the spread conductors are matched with the area of the outlet section 4a of the first extrusion mold 4, so that the cross-sectional shape of the extruded conductors is a semicircle formed by the extruded conductors. The present embodiment skillfully utilizes the structures of the doubling die 3 and the first extrusion die 4 to form the cable core into a semicircular structure.
The present embodiment further includes a vacuum evacuation device 12 for evacuating the doubling die 3 and/or the first extrusion die 4. In this embodiment, it is preferable that the doubling die 3 and the first extrusion die 4 are mounted on the same extruder head, the vacuum extractor 12 is connected to the extruder head, and when the vacuum extractor 12 operates, the vacuum extractor simultaneously performs a vacuum-extracting function on the doubling die 3 and the first extrusion die 4.
Above-mentioned through evacuating device 12 to doubling mould 3 and first extrusion tooling 4 evacuation simultaneously, the technological effect who reaches is, evacuating device 12 provides the negative pressure effort for doubling mould 3 and first extrusion tooling 4, can make the stranded conductor no matter in doubling mould 3 like this, still in first extrusion tooling 4, the homoenergetic is more regular to can promote semicircle cable core 11 shape, avoid extruding the condition emergence that has the swell or collapse on semicircle cable core 11 after first insulation layer 5.
After the strand conductor and the insulating material are co-extruded, the temperature of the first insulating layer 5 is high, so that the cooling device is used for cooling the semicircular cable core 11 to accelerate the solidification of the first insulating layer 5 and prevent deformation. In the embodiment, the cooling device comprises the first water tank 13 with the first cooling water temperature and the second water tank 14 with the second cooling water temperature, and the semicircular cable cores 11 are cooled in a sectional mode by adopting different temperatures, so that the cooling efficiency is improved.
The preparation method for manufacturing the semicircular cable core by adopting the production line comprises the following steps:
s1, stranding a plurality of metal monofilaments to form a stranded conductor; in the step, the pitch of each stranded conductor is 20-30 times of the outer diameter of the stranded conductor, and the pitch of each stranded conductor is preferably 30 times of the outer diameter of the stranded conductor. In this step, the stranded conductor formed by stranding includes a first stranded conductor 1 and a second stranded conductor 2.
In the semicircular cable core 11 of this embodiment, the number of the first twisted conductors 1 is preferably two, the number of the second twisted conductors 2 is preferably one, the outer diameters of the first twisted conductors 1 and the second twisted conductors 2 are not equal, and the outer diameter of the second twisted conductor 2 is larger than the outer diameter of the first twisted conductor 1.
Arranging the obtained first stranded conductor 1 and the second stranded conductor 2 on a pay-off rack respectively, and specifically: the first twisted conductor 1 is wound on a first pay-off stand 6, the second twisted conductor 2 is wound on a second pay-off stand 7, the second first twisted conductor 1 is wound on a third pay-off stand 8, the first twisted conductor 1 paid out from the first pay-off stand 6 and the third pay-off stand 8 and the second twisted conductor 2 paid out from the second pay-off stand 7 are respectively, and tension is generated on the first twisted conductor 1 and the second twisted conductor 2 by a tension stand 9 respectively.
S2, the multiple stranded conductors pass through the doubling mold 3 and are bundled by the doubling mold 3, that is, the first stranded conductor 1 and the second stranded conductor 2 enter the doubling mold 3 after passing through the tension frame 9, in this embodiment, the arrangement of the first stranded conductor 1 and the second stranded conductor 2 when passing through the doubling mold 3 is as follows: one first stranded conductor 1 is disposed on each side of the second stranded conductor 2.
Because the inner hole of the first outlet section 31b on the doubling die 3 is enclosed by the first chord 3a, the first arc 3b, the second arc 3c and the third arc 3d, the first chord 3a is arranged opposite to the first arc 3b, one end of the first chord 3a is connected with one end of the first arc 3b through the second arc 3c, the other end of the first chord 3a is connected with the other end of the first arc 3b through the third arc 3d, and the maximum distance H between the first chord 3a and the first arc 3b is less than half of the chord length of the first chord 3 a; a first central angle α corresponding to the first arc 3b is smaller than a second central angle β corresponding to the second arc 3c and the third arc 3d, and an arc length of the first arc 3b is larger than arc lengths of the second arc 3c and the third arc 3 d.
According to the above structure, the stranded conductor passes through the doubling die 3, wherein: the outer peripheral surface of the first twisted conductor 1 is respectively matched with a first chord 3a, a first arc 3b and a second arc 3c of a first outlet section 31b of the doubling mold 3; the outer peripheral surface of the second first twisted conductor 1 is respectively matched with a first chord 3a, a first arc 3b and a third arc 3d of a first outlet section 31b of the doubling die 3; the outer peripheral surfaces of the second stranded conductors 2 are respectively fitted with the first chords 3a, the first arcs 3b of the first outlet sections 31b of the doubling dies 3.
Based on the inner hole profile of the first outlet section 31b of the doubling mold 3, wherein any distance between the first chord 3a and the first arc 3b is larger than the distance between the first chord 3a and the second arc 3c or the third arc 3d, therefore, the space height of the middle part in the inner hole of the first outlet section 31b is larger than the space heights of the two side parts, and because the outer diameter of the second stranded conductor 2 is larger than the outer diameter of the first stranded conductor 1, one first stranded conductor 1 is respectively arranged on the two sides of the second stranded conductor 2, and after the stranded conductors are wound by the doubling mold 3, the cross sections of the stranded conductors are favorably close to a semicircle.
And S3, when the stranded conductors bundled by the doubling die 3 pass through the first extrusion die 4 with at least an inner hole of the outlet section 4a being semicircular, at least one part of the stranded conductors is extruded and dispersed by the wall surface of the inner hole of the first extrusion die 4 and matched with the outlet section 4a of the first extrusion die 4, and then the stranded conductors are wrapped by the insulating material injected into the first extrusion die 4 and extruded together to form the semicircular cable core 11 with the first insulating layer 5. The insulating material forming the first insulating layer 5 is low-smoke halogen-free flame-retardant polyolefin insulating material, the insulating nominal thickness of the first insulating layer 5 is 0.9mm, and the thickness of the thinnest part is not less than 0.71mm. The semicircular cable core 11 obtained in this embodiment has a ratio of width to height of 9.9-10.3:4.5-4.9.
Since the outer diameter of the second stranded conductor 2 is larger than the outer diameter of the first stranded conductor 1, the first stranded conductor 1 and the second stranded conductor 2 have a gap. Since the inner hole area of the first outlet section 31b of the doubling die 3 is larger than the inner hole area of the outlet section 4a of the first extrusion die 4, the strand conductors are pressed by the outlet section 4a of the first extrusion die 4, at least a part of the strand conductors are scattered, and the scattered strand conductors fill the gaps, and in this process, although the strand conductors are passively pressed, the strand conductors are scattered to fill the gaps by the pressing, and finally, all the conductors have semicircular cross sections, so that the metal filaments are not broken as in the prior art, burrs are not formed on each strand conductor, and the first insulating layer 5 is prevented from being weakened by the strand conductors, and therefore, the thickness of the extruded first insulating layer 5 in each part is uniform in this embodiment.
The method also comprises the step of continuously vacuumizing the doubling die 3 and the first extrusion die 4. And after the twisted conductor is extruded together with the insulating material to form the semicircular cable core 11, the method further comprises the step of cooling the semicircular cable core 11, namely, sequentially passing the semicircular cable core 11 through a first water tank 13 with a first cooling water temperature and a second water tank 14 with a second cooling water temperature, and cooling the semicircular cable core 11 in a sectional manner through the first water tank 13 and the second water tank 14, wherein the cooling water temperature in the first water tank 13 is 50-70 ℃, and the cooling water in the second water tank 14 is normal temperature. After cooling, the first insulating layer 5 is shaped, whereby the obtained semicircular cable core 11 is wound up by means of a take-up stand 10. Accordingly, the process of preparing the semicircular cable core is finished. By the process, the qualification rate of the semicircular cable core 11 reaches more than 99%.
The semi-circular cable core 11 manufactured by the above method can be applied to various places, such as the fields of petrochemical industry, communication, etc., in this embodiment, the method for manufacturing a communication cable having the semi-circular cable core 11 is described by taking the application to the communication field as an example, and includes the following steps:
s11, combining the two semicircular cable cores 11 to form a circular cable core, and wrapping the circular cable core by using a wrapping tape to form a wrapping layer 15; in this embodiment, the tape is preferably an aluminum-plastic composite tape, and in the wrapping process, the average covering rate of the tape is not less than 15%.
S12, weaving a metal material on the lapping layer in a weaving mode to form a metal woven layer 16; in the embodiment, the alloy material knitting wire with the monofilament diameter of 0.15-0.18mm is adopted for knitting.
And S13, extruding the sheath material outside the metal braided layer by adopting an extruding mode to form an outer sheath 17. In the embodiment, the jacket material is preferably a low-smoke halogen-free flame-retardant polyolefin jacket material, the nominal thickness of the outer jacket 17 is 1.6mm, and the thickness of the thinnest part is not less than 1.22mm.
The radial cross-sectional area of the conductor is 25mm2The copper core cable is taken as an example, and the main technical indexes are as follows:
TABLE 1
The maximum direct current resistance of the conductor at 20 ℃ is one of the aspects of judging whether the product is qualified, and the direct current resistance (omega/km) of the conductor at 20 ℃ is detected by the method, specifically as follows:
detection standard: GB/T3048.4-2007
Sample preparation: a sample of not less than 1m is taken from the cable to be tested, and the covers at both ends and the connecting portion are removed to expose the conductor.
Test environment temperature: the sample is placed in a test environment at a temperature of 15-25 ℃ and an air humidity of not more than 85% for a time sufficient to allow temperature equilibration.
Test equipment: and a fixed electric bridge special for a laboratory is adopted for testing.
The test results show that the direct current resistance of the conductor at 20 ℃ is as follows: 0.768-0.773 omega/km.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, not to limit it, and not to limit the protection scope of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (5)
1. The doubling die for preparing the semicircular cable core is characterized by comprising a body (30) and a doubling guide hole (31) penetrating through the body (30), wherein the doubling guide hole (31) comprises a first inlet section (31 a) and a first outlet section (31 b), the inner hole profile of the first outlet section (31 b) consists of a first chord (3 a), a first arc (3 b), a second arc (3 c) and a third arc (3 d), the first chord (3 a) is arranged opposite to the first arc (3 b), one end of the first chord (3 a) is connected with one end of the first arc (3 b) through the second arc (3 c), the other end of the first chord (3 a) is connected with the other end of the first arc (3 b) through the third arc (3 d), and the maximum distance (H) between the first chord (3 a) and the first arc (3 b) is smaller than half of the chord length of the first arc (3 a).
2. Doubling die for the preparation of semi-circular cable cores according to claim 1, wherein said first arcs (3 b) have a first central angle α, smaller than a second central angle β corresponding to the second arcs (3 c) and to the third arcs (3 d).
3. Doubling die for the preparation of semi-circular cable cores according to claim 1, wherein the arc length of the first arc (3 b) is greater than the arc length of the second (3 c) and third (3 d) arcs.
4. Doubling die for the preparation of semi-circular cable cores according to claim 1, wherein the first inlet section (31 a) is a tapered bore.
5. Doubling die for making semi-circular cable cores according to claim 1, wherein half of said first chord (3 a) is 1.04-1.13 times said maximum pitch (H).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221857164.2U CN217719146U (en) | 2022-07-19 | 2022-07-19 | Doubling die for preparing semicircular cable cores |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221857164.2U CN217719146U (en) | 2022-07-19 | 2022-07-19 | Doubling die for preparing semicircular cable cores |
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| CN217719146U true CN217719146U (en) | 2022-11-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115240921A (en) * | 2022-07-19 | 2022-10-25 | 常州八益电缆股份有限公司 | Semicircular cable core and preparation method of communication cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115240921A (en) * | 2022-07-19 | 2022-10-25 | 常州八益电缆股份有限公司 | Semicircular cable core and preparation method of communication cable |
| CN115240921B (en) * | 2022-07-19 | 2024-07-09 | 常州八益电缆股份有限公司 | Semicircular cable core and preparation method of communication cable |
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