CN217258248U

CN217258248U - Cable insulation extrusion die

Info

Publication number: CN217258248U
Application number: CN202123407124.6U
Authority: CN
Inventors: 康慧; 姚宇航; 袁若冰; 刘曼; 钱江伟
Original assignee: Jiangsu Hengtong Power Cable Co Ltd
Current assignee: Jiangsu Hengtong Power Cable Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-08-23
Anticipated expiration: 2031-12-30

Abstract

The utility model belongs to the technical field of the cable mold, a cable insulation extrusion tooling is disclosed. The cable insulation extrusion die comprises a die sleeve, a middle die and a die core, wherein the die sleeve is provided with a first accommodating groove, and the bottom wall of the first accommodating groove is provided with a first outlet; the middle die extends into the first accommodating groove, a first extrusion channel is formed between the outer wall of the middle die and the inner wall of the first accommodating groove, the middle die is provided with a second accommodating groove, the bottom wall of the second accommodating groove is provided with a second outlet, and the front end of the first extrusion channel and the first outlet form a first extrusion port; the mold core stretches into in the second holding tank, forms the second between the outer wall of the inner wall of second holding tank and mold core and extrudes the passageway, and the front end that the passageway was extruded to the second forms the second with the second export and extrudes the mouth, and the mold core is equipped with the threading through-hole, and the threading through-hole communicates with first export and second export. The utility model provides an insulating extrusion tooling of cable extrudes the mouth through first extrusion mouth and second and carries out insulation treatment to the cable, has effectively improved the homogeneity of insulating layer.

Description

Cable insulation extrusion die

Technical Field

The utility model relates to a cable mold technical field especially relates to an insulating extrusion tooling of cable.

Background

Cables are generally rope-like cables made by stranding several or groups of conductors (at least two in each group), each group being insulated from each other and often twisted around a center, the entire outer surface being coated with a highly insulating coating. The cable has the characteristics of internal electrification and external insulation.

The cable can include many processes when making, generally can divide into four main aspects, including conductor preparation, insulating core preparation, cable sheath preparation and quality control, and utilize the extruder to extrude conductor shielding material, insulating material and insulating shielding material on the cable conductor when insulating core preparation, and then carry out the cross-linking, vulcanize. Vulcanization is a chemical reaction that improves the strength and stability of the cable at high temperatures. In the vulcanization process, the cable enters a high-temperature high-pressure vulcanization pipeline, steam is used for pressurizing the inside of the pipeline, and the cable after vulcanization is cooled and leaves the vulcanization pipe.

In the prior art, when an insulating layer of a cable is prepared, the thickness of the insulating layer extruded by an adopted die is uneven, and the overall outer diameter of the cable is larger, so that the requirement of feed cable voltage drop cannot be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cable insulation extrusion tooling to solve the inhomogeneous problem of insulating layer thickness of cable among the prior art.

To achieve the purpose, the utility model adopts the following technical proposal:

a cable insulation extrusion die comprising:

the die sleeve is provided with a first accommodating groove, and the bottom wall of the first accommodating groove is provided with a first outlet;

the middle die extends into the first accommodating groove, a first extrusion channel is formed between the outer wall of the middle die and the inner wall of the first accommodating groove, the middle die is provided with a second accommodating groove, the bottom wall of the second accommodating groove is provided with a second outlet, and the front end of the first extrusion channel and the first outlet form a first extrusion port;

the mold core, the mold core stretches into in the second holding tank, the inner wall of second holding tank with form the second between the outer wall of mold core and extrude the passageway, the second extrude the front end of passageway with the second export forms the second and extrudes the mouth, the mold core is equipped with the threading through-hole, the threading through-hole with first export with the second export intercommunication.

Optionally, the mold core is a conical cylindrical structure, and the threading through hole is arranged along the axial direction of the mold core.

Optionally, the mold core comprises a first conical cylinder and a second conical cylinder which are connected with each other, a maximum end of the first conical cylinder is connected with a minimum end of the second conical cylinder, and the minimum end of the first conical cylinder is arranged close to the second outlet.

Optionally, the diameter of the threading through hole gradually increases along the axial direction of the mold core, and the small end of the threading through hole is close to the second outlet.

Optionally, the middle mold is of a cylindrical structure and includes a conical portion, the conical portion extends into the first accommodating groove, and the conical portion is sleeved on the outer side of the first tapered cylinder.

Optionally, the middle mold further comprises an extension part, the extension part is connected with the conical part, and the extension part is sleeved on the outer side of the second conical cylinder.

Optionally, the outer wall of the extension part is provided with an annular groove, and the annular groove is used for disassembling the middle die.

Optionally, the extension portion and the conical portion are integrally formed.

Optionally, the inner wall of the mold core is provided with a bayonet, and the bayonet is used for disassembling the mold core.

Optionally, the end of the die sleeve is provided with a protrusion, the protrusion is of an L-shaped structure, and the protrusion is used for detaching the die sleeve.

The utility model has the advantages that: the utility model provides an insulating extrusion tooling of cable, through setting up the die sleeve, well mould and mold core, the die sleeve is equipped with first holding tank, the diapire of first holding tank is equipped with first export, well mould is equipped with the second holding tank, the diapire of second holding tank is equipped with the second export, the inner wall of first holding tank and the first passageway of extruding of outer wall formation of well mould, the inner wall of second holding tank and the outer wall formation second of mold core extrude the passageway, first passageway and the first export of extruding form first extrusion orifice, the second is extruded passageway and second export and is formed the second extrusion orifice, when the cable is worn to locate the threading through-hole, extrude the mouth through first extrusion orifice and second and carry out insulation treatment to the cable, guarantee to extrude the homogeneity of insulating layer, the quality of insulating layer has been improved.

Drawings

Fig. 1 is a cross-sectional view of a die sleeve of a cable insulation extrusion die provided by the present invention;

fig. 2 is a side view of a die sleeve of the cable insulation extrusion die provided by the present invention;

fig. 3 is a cross-sectional view of a middle mold of the cable insulation extrusion mold provided by the present invention;

fig. 4 is a schematic structural diagram of a middle mold of the cable insulation extrusion mold provided by the present invention;

fig. 5 is a sectional view of a mold core of the cable insulation extrusion mold provided by the present invention;

fig. 6 is a side view of the mold core of the cable insulation extrusion mold provided by the present invention;

fig. 7 is an assembly view of the cable insulation extrusion die provided by the present invention;

fig. 8 is a vulcanization parameter diagram of the cable insulation prepared by the cable insulation extrusion die provided by the present invention.

In the figure:

1. die sleeve; 11. a first accommodating groove; 12. a first outlet; 13. a protrusion; 14. a fastener; 2. a middle mold; 21. a second accommodating groove; 22. a second outlet; 23. a conical section; 24. an extension portion; 25. a semicircular recess; 26. an annular groove; 3. a mold core; 31. a threading through hole; 32. a first conical cylinder; 33. a second conical cylinder; 34. and (4) a bayonet.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a cable insulation extrusion die, as shown in fig. 1 to 7, the cable insulation extrusion die comprises a die sleeve 1, a middle die 2 and a die core 3, the die sleeve 1 is provided with a first accommodating groove 11, and the bottom wall of the first accommodating groove 11 is provided with a first outlet 12; the middle die 2 extends into the first accommodating groove 11, a first extrusion channel is formed between the outer wall of the middle die 2 and the inner wall of the first accommodating groove 11, the middle die 2 is provided with a second accommodating groove 21, the bottom wall of the second accommodating groove 21 is provided with a second outlet 22, and the front end of the first extrusion channel and the first outlet 12 form a first extrusion port; the mold core 3 stretches into the second accommodating groove 21, a second extrusion channel is formed between the inner wall of the second accommodating groove 21 and the outer wall of the mold core 3, a second extrusion port is formed between the front end of the second extrusion channel and the second outlet 22, the mold core 3 is provided with a threading through hole 31, and the threading through hole 31 is communicated with the first outlet 12 and the second outlet 22.

The utility model provides an insulating extrusion tooling of cable, through setting up die sleeve 1, well mould 2 and mold core 3, die sleeve 1 is equipped with first holding tank 11, the diapire of first holding tank 11 is equipped with first export 12, well mould 2 is equipped with second holding tank 21, the diapire of second holding tank 21 is equipped with second export 22, the inner wall of first holding tank 11 forms the first passageway of extruding with well mould 2's outer wall, the inner wall of second holding tank 21 forms the second with mold core 3's outer wall and extrudes the passageway, the first passageway of extruding forms first extrusion mouth with first export 12, the second is extruded passageway and second export 22 and is formed the second and extrude the mouth, when threading through-hole 31 is worn to locate by the cable, extrude the mouth through first extrusion mouth and second and carry out insulation treatment to the cable, guarantee to extrude insulating rubber and extrude evenly, the quality of insulating layer has been improved.

Alternatively, the mold core 3 is a tapered cylindrical structure, and the threading through-hole 31 is provided in the axial direction of the mold core 3. Through setting up mold core 3 for toper tubular structure, be convenient for stretch into second holding tank 21 with mold core 3 in, improved the convenience of assembly.

Further, the mold core 3 includes a first taper cylinder 32 and a second taper cylinder 33 connected to each other, a maximum end of the first taper cylinder 32 is connected to a minimum end of the second taper cylinder 33, and the minimum end of the first taper cylinder 32 is disposed near the second outlet 22. The biggest end through setting up first toper barrel 32 is connected with the minimum end of second toper barrel 33, and the minimum end of first toper barrel 32 is close to second export 22 and sets up, is convenient for stretch into first holding tank 11 with first toper barrel 32 in, has improved assembly convenience, convenient to detach. Optionally, the first taper cylinder 32 has an outer taper angle of 25 ° to 35 °. The arrangement ensures smooth flowing of the insulating rubber material and uniform discharging of the insulating rubber material. In this embodiment, the first taper cylinder 32 has an outer taper angle of 30 °. In other embodiments, the size of the external cone angle of the first conical cylinder 32 can be set by those skilled in the art according to actual needs.

Alternatively, the diameter of the threading through hole 31 gradually increases in the axial direction of the mold core 3, and the small end of the threading through hole 31 is close to the second outlet 22. This kind of setting, the cable of being convenient for gets into and passes second export 22 by the main aspects of threading through-hole 31, has improved the convenience that practicality and cable were worn to establish.

Specifically, the diameter of the small end of the threading through hole 31 is 20mm-28 mm. The arrangement can ensure that the cable is not clamped, and can reduce the problem of core eccentricity. Illustratively, when the outer diameter of the cable is 23.8mm, the diameter of the threading through hole 31 may be set to 24mm, preventing mold sticking.

Optionally, the middle mold 2 is a cylindrical structure, the middle mold 2 includes a conical portion 23, the conical portion 23 extends into the first receiving groove 11, and the conical portion 23 is sleeved outside the first tapered cylinder 32. By arranging the conical part 23, the speed of the conical part 23 extending into the first accommodating groove 11 is increased, and the installation is facilitated; the first conical barrel body 32 is sleeved with the conical part 23, so that the second extrusion channel formed by the inner wall of the second accommodating groove 21 and the outer wall of the mold core 3 has certain conical degree, the extrusion of the insulating rubber material is facilitated, and the extrusion speed and the extrusion uniformity of the insulating rubber material are improved.

The first conical cylinder 32 and the second conical cylinder 33 are preferably integrally formed. The arrangement reduces the processing cost, simplifies the processing technology and is beneficial to manufacturing.

Optionally, the middle mold 2 further includes an extension portion 24, the extension portion 24 is connected to the conical portion 23, and the extension portion 24 is sleeved outside the second conical cylinder 33. Through the arrangement of the extension portion 24, the sectional area of a second extrusion channel formed by the inner wall of the extension portion 24 and the outer wall of the second conical cylinder 33 is larger than that of a second extrusion channel formed by the inner wall of the conical portion 23 and the outer wall of the second conical cylinder 33, so that the insulating rubber material can conveniently enter a second extrusion port, and the extrusion uniformity of the insulating rubber material is further improved.

To facilitate removal of middle mould 2, the outer wall of extension 24 is provided with an annular groove 26 and the outer wall of conical portion 23 is provided with a semicircular recess 25. When the centering die 2 is detached, an operator clamps and pulls the centering die 2 through the annular groove 26, or clamps the centering die 2 through the semicircular recess 25.

Preferably, the extension portion 24 and the conical portion 23 are integrally formed. The arrangement simplifies the processing technology and reduces the processing cost.

Optionally, the first receiving groove 11 is conical, a bottom wall of the first receiving groove 11 is disposed at a small end of the first receiving groove 11, and the first outlet 12 is disposed on the bottom wall. For coniform through setting up first holding tank 11, in the circular cone portion 23 of well mould 2 stretched into first holding tank 11, the outer wall of circular cone portion 23 formed the first passageway of extruding with the inner wall of first holding tank 11, and the first passageway of extruding has certain tapering, makes insulating rubber material extrusion speed even flow level and smooth, guarantees that crowded package external diameter is more even. Alternatively, the tapered surface formed by the side walls of the first receiving groove 11 may have a taper angle of 50 ° to 90 °. This kind of setting guarantees that the insulating rubber material flow in the first passageway of extruding is mild, and insulating rubber extrudes evenly. In this embodiment, the taper angle of the conical surface formed by the side wall of the first accommodation groove 11 is 65 °. In other embodiments, the taper angle of the conical surface formed by the side wall of the first accommodating groove 11 can be set by those skilled in the art according to actual needs.

In order to facilitate the disassembly of the mould core 3, the inner wall of the mould core 3 is provided with a bayonet 34. The operator can fix the bayonet 34 to disassemble the mold core 3, and the disassembly convenience of the mold core 3 is improved.

The tip of die sleeve 1 is equipped with arch 13, and arch 13 is L shape structure, and arch 13 is used for dismantling die sleeve 1, has improved the dismantlement convenience of die sleeve 1.

Optionally, the die case 1 is provided with a fastener 14, and the protrusion 13 is mounted on the die case 1 through the fastener 14. With this arrangement, the mounting reliability of the projection 13 is improved. Or the bulge 13 and the die sleeve 1 are integrally formed, so that the process is simplified.

Optionally, the length of the thread bearing area of the die case 1 is 3mm to 9 mm. The arrangement can ensure that the insulating rubber on the surface of the cable is closely distributed, and the size of the outer diameter is uniform. In this embodiment, the length of the wire receiving area of the die case 1 is 6 mm. In other embodiments, the length of the wire-supporting area can be set by those skilled in the art according to actual needs.

Optionally, the longitudinal section of the first outlet 12 of the die sleeve 1 is circular, the diameter of the first outlet 12 is larger than the outer diameter of the insulated cable, and the difference between the diameter of the first outlet 12 and the outer diameter of the insulated cable is 0.5mm-1.5 mm. This kind of setting can prevent the cable after insulation treatment card mould when the mould from leaving, can guarantee the smooth drawing of patterns of cable.

Optionally, the distance between the mold core 3 and the middle mold 2 and the distance between the middle mold 2 and the mold sleeve 1 are twice the thickness of the insulating rubber to be extruded. This kind of setting can guarantee that insulating rubber extrudes evenly and inseparably, makes the insulating layer thickness of cable even.

When the cable insulation layer prepared by the cable insulation extrusion die is vulcanized, the length of the vulcanizing pipe adopted in the embodiment is 128m, the length of the catenary section is 38m, the length of the downdip section is 90m, the maximum working pressure of the vulcanizing pipe is 25bar, and the working temperature is 250 ℃. Specific curing parameters are shown in fig. 8. And vulcanizing the insulated cable by adopting the vulcanization parameters in the figure 8, wherein the vulcanized insulated layer is fully vulcanized.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cable insulation extrusion die, comprising:

the die sleeve (1), the die sleeve (1) is provided with a first accommodating groove (11), and the bottom wall of the first accommodating groove (11) is provided with a first outlet (12);

the middle die (2) extends into the first accommodating groove (11), a first extrusion channel is formed between the outer wall of the middle die (2) and the inner wall of the first accommodating groove (11), the middle die (2) is provided with a second accommodating groove (21), the bottom wall of the second accommodating groove (21) is provided with a second outlet (22), and the front end of the first extrusion channel and the first outlet (12) form a first extrusion port;

mold core (3), mold core (3) stretch into in second holding tank (21), the inner wall of second holding tank (21) with form the second between the outer wall of mold core (3) and extrude the passageway, the second extrude the front end of passageway with second export (22) form the second and extrude the mouth, mold core (3) are equipped with threading through-hole (31), threading through-hole (31) with first export (12) with second export (22) intercommunication.

2. The cable insulation extrusion die of claim 1, wherein the die core (3) is a conical cylindrical structure, and the threading through hole (31) is arranged along the axial direction of the die core (3).

3. The cable insulation extrusion die according to claim 2, wherein the die core (3) comprises a first tapered cylinder (32) and a second tapered cylinder (33) connected to each other, a largest end of the first tapered cylinder (32) being connected to a smallest end of the second tapered cylinder (33), the smallest end of the first tapered cylinder (32) being disposed near the second outlet (22).

4. The cable insulation extrusion die according to claim 3, wherein the diameter of the threading through hole (31) is gradually increased in the axial direction of the die core (3), and the small end of the threading through hole (31) is close to the second outlet (22).

5. The cable insulation extrusion die of claim 3, wherein the middle die (2) is a cylindrical structure, the middle die (2) comprises a conical part (23), the conical part (23) extends into the first accommodating groove (11), and the conical part (23) is sleeved outside the first tapered cylinder (32).

6. The cable insulation extrusion die of claim 5, wherein the middle die (2) further comprises an extension portion (24), the extension portion (24) is connected with the conical portion (23), and the extension portion (24) is sleeved outside the second conical cylinder (33).

7. The cable insulation extrusion die according to claim 6, characterized in that the outer wall of the extension (24) is provided with an annular groove (26), the annular groove (26) being used for dismounting the middle die (2).

8. The cable insulation extrusion die according to claim 7, wherein the extension portion (24) and the conical portion (23) are integrally molded.

9. The cable insulation extrusion die according to any one of claims 1 to 8, characterized in that the inner wall of the die core (3) is provided with a bayonet (34), the bayonet (34) being used for disassembling the die core (3).

10. The cable insulation extrusion die according to any one of claims 1 to 8, wherein the end of the die sleeve (1) is provided with a protrusion (13), the protrusion (13) is of an L-shaped structure, and the protrusion (13) is used for disassembling the die sleeve (1).