Mold and production equipment

Abstract

The present application relates to the technical field of cable production, and aims to solve the technical problem of low submarine cable production quality, and provides a mold and production equipment. The mold comprises a mold sleeve and a mold core. A mold cavity is formed in the mold sleeve, the mold cavity penetrates the mold sleeve along a first direction, and the mold sleeve has a first end and a second end. The mold core is arranged in the mold cavity along the first direction, and has a third end and a fourth end. The third end is arranged opposite to the first end, and the fourth end is located on the side of the second end away from the first end. The outer surface of the mold core and the inner surface of the mold sleeve define an extrusion channel. The extrusion channel is used for extruding a coating material from the second end to the first end. The mold core is also provided with a cable channel penetrating along the first direction. The cable channel is used for the cable structure to pass through. An airflow channel is formed in the end face of the third end. A one-way flow guide structure is arranged in the airflow channel. The one-way flow guide structure is used for guiding airflow to flow only from the third end to the fourth end. The present application has the beneficial effect of improving the production quality of the cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable production, in particular to a mold and a production device. BACKGROUND

[0002] Known wet-type submarine cables all adopt a non-lead sheath structure, and the radial water resistance is mainly realized by arranging a water resistance belt and a polymer sheath structure outside the cable. The production quality of the polymer sheath plays a decisive role in the use of the submarine cable.

[0003] During the production of the polymer sheath, water vapor between the sheath and the cable structure is not easy to be discharged and is retained between the sheath and the cable structure, so that a "bulge" is formed on the outside of the sheath, the sheath cannot tightly cover the cable structure, and the bulge is prone to rupture. In addition, the sheath cannot be stopped in the middle of the production process, and the whole submarine cable needs to be re-produced when a serious bulge problem occurs. SUMMARY

[0004] The present application provides a mold and a production device to solve the technical problem of low production quality of submarine cables.

[0005] Embodiments of the present application are implemented as follows:

[0006] In a first aspect, the present application provides a mold, comprising a mold sleeve and a mold core. A mold cavity is arranged in the mold sleeve, the mold cavity penetrates the mold sleeve along a first direction, and the mold sleeve has a first end and a second end. The mold core is arranged in the mold cavity along the first direction, and the mold core has a third end and a fourth end. The third end is arranged corresponding to the first end, and the fourth end is located on a side of the second end away from the first end. An outer surface of the mold core and an inner surface of the mold sleeve define an extrusion channel, the extrusion channel is used for extruding a covering material from the second end to the first end, and the mold core is further provided with a cable channel penetrating along the first direction, the cable channel is used for passing a cable structure. An airflow channel is arranged on an end face of the third end, the airflow channel is in communication with an external environment, and the airflow channel is arranged between the outer surface and the inner surface of the mold core. A one-way flow guide structure is arranged in the airflow channel, and the one-way flow guide structure is used for guiding airflow to flow only from the third end to the fourth end.

[0007] The one-way flow guide structure can accelerate the water vapor to be discharged from the third end to the outside environment through the airflow channel, thereby further accelerating the discharge rate of the water vapor, ensuring that the water vapor in the annular space can be quickly discharged without being retained, and ensuring the production quality of the submarine cable under the premise of improving the production efficiency of the submarine cable and the high production rate of the submarine cable.

[0008] In a possible implementation, the one-way flow guide structure comprises a Tesla valve structure.

[0009] In a possible implementation, the one-way flow guide structure comprises a plurality of rows of arc-shaped protrusion groups, the plurality of rows of arc-shaped protrusion groups are distributed along a second direction, the second direction is perpendicular to or oblique to the first direction, each row of arc-shaped protrusion groups comprises arc-shaped protrusions distributed along the first direction, the arc-shaped protrusions of one of the two adjacent rows of arc-shaped protrusion groups are located between two adjacent arc-shaped protrusions of the other row of arc-shaped protrusion groups, and the arc-shaped protrusions are recessed from the fourth end to the third end, and the two sides of the arc-shaped protrusions arranged oppositely abut against one side of the airflow channel close to the inner surface and one side of the airflow channel close to the outer surface, respectively.

[0010] In a possible implementation, the one-way flow guide structure further comprises a plug-in seat, and the plurality of rows of arc-shaped protrusion groups are arranged in the plug-in seat, and the plug-in seat is detachably arranged in the airflow channel.

[0011] In a possible implementation, a plurality of airflow channels are arranged around the central axis of the cable, and a plurality of one-way flow guide structures are arranged, and each one-way flow guide structure is detachably arranged in one airflow channel.

[0012] In a second aspect, the present application provides a production device comprising the mold, the pay-off device, the traction device and the extrusion device described above. The pay-off device is used to output the cable structure. The traction device is used to pull the cable structure to pass through the fourth end of the mold core and to pass out from the third end of the mold core. The extrusion device is used to extrude the coating material to the extrusion channel of the mold and to coat the cable structure to form a semi-finished cable.

[0013] In a possible implementation, the mold further comprises a cooling device, the cooling device comprises a cooling tank for storing cooling liquid to cool the semi-finished cable, and the cooling device further comprises a splash-proof device arranged at an input port of the cooling tank, the input port being used for inputting the semi-finished cable output from the extrusion device, and the splash-proof device is used to reduce the splash height of the cooling liquid discharged from the input port.

[0014] In a possible implementation, the tank body of the cooling tank extends along a first direction, the input port is formed at one end of the cooling tank in the first direction, the splash-proof device is arranged at a side of the input port facing the extrusion device, and in the direction of gravity, the splash-proof device is located below the cooling tank; the splash-proof device comprises a liquid receiving tank, and an opening of the liquid receiving tank is provided with an adsorption structure, the adsorption structure is used to adsorb the cooling liquid discharged from the input port, so that the splash height of the cooling liquid is less than the distance between the adsorption structure and the semi-finished cable located in the cooling tank in the direction of gravity.

[0015] In a possible implementation, the cooling tank is provided with a cooling liquid channel extending through the cooling tank along the first direction, the input port is formed at one end of the cooling tank in the first direction, the splash-proof device is arranged at a side of the input port facing the extrusion device, and in the direction of gravity, the splash-proof device is located below the cooling tank; the splash-proof device comprises a liquid receiving tank and a spiral liquid conveying pipe, the liquid receiving tank is in communication with the input port, a tank bottom of the liquid receiving tank is inclined in the direction away from the input port in the direction of gravity, and the spiral liquid conveying pipe is in communication with the liquid receiving tank.

[0016] In a possible implementation, the cooling device further comprises a temporary storage part, the temporary storage part defines a temporary storage cavity, the temporary storage cavity is used to communicate with a cooling source, the cooling source is used to input cooling liquid into the temporary storage cavity, a tank side wall of the cooling tank is provided with a communication hole, the cooling tank is in communication with the temporary storage cavity through the communication hole, the communication hole is located above the tank bottom wall of the cooling tank, and a filter screen is arranged in the communication hole, the filter screen is used to filter the liquid flow from the temporary storage cavity to the cooling tank and reduce the bubble content of the cooling liquid flowing into the cooling tank from the temporary storage cavity. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 A sectional view of a mold according to an embodiment of the present application;

[0019] Figure 2 A front view of a mold core according to an embodiment of the present application;

[0020] Figure 3 A side view of a unidirectional flow guide according to an embodiment of the present application;

[0021] Figure 4 A front view of a unidirectional flow guide according to an embodiment of the present application;

[0022] Figure 5 A schematic structural view of a production apparatus according to an embodiment of the present application;

[0023] Figure 6 A schematic structural view of a cooling device according to an embodiment of the present application;

[0024] Figure 7 A schematic structural view of a cooling device according to another embodiment of the present application;

[0025] Figure 8 A schematic structural view of a cooling device according to another embodiment of the present application;

[0026] Figure 9 A schematic structural view of a cooling device according to another embodiment of the present application;

[0027] Figure 10 A schematic structural view of a cooling device according to another embodiment of the present application;

[0028] Figure 11 A schematic structural view of a splash-proof device according to an embodiment of the present application;

[0029] Figure 12 A schematic structural view of a splash-proof device according to another embodiment of the present application.

[0030] Explanation of main component symbols:

[0031] Mold 100

[0032] Mold sleeve 10

[0033] First end 11

[0034] Second end 12

[0035] Mold cavity 13

[0036] Mold core 20

[0037] Third end 21

[0038] Fourth end 22

[0039] Cable passage 23

[0040] conical section 231

[0041] flat section 232

[0042] air flow channel 24

[0043] extrusion channel 30

[0044] one-way flow guide structure 40

[0045] tesla valve structure 41

[0046] arc-shaped protrusion 42

[0047] plug-in seat 43

[0048] butterfly-shaped plug-in slot 431

[0049] production equipment 200

[0050] wire laying device 51

[0051] traction device 52

[0052] extrusion device 53

[0053] heating device 54

[0054] meter printing device 55

[0055] spark test device 56

[0056] wire winding device 57

[0057] cooling device 60

[0058] cooling tank 61

[0059] high-temperature section 611

[0060] medium-temperature section 612

[0061] low-temperature section 613

[0062] input port 614

[0063] baffle 62

[0064] avoidance groove 621

[0065] temporary storage unit 63

[0066] interlayer 631

[0067] housing 632

[0068] pipe 633

[0069] liquid inlet 6331

[0070] Replenishment port 6332

[0071] Temporary storage cavity 64

[0072] Communication hole 65

[0073] Filter screen 66

[0074] Splash-proof device 70

[0075] Liquid receiving groove 71

[0076] Adsorption structure 72

[0077] Spiral liquid delivery pipe 73

[0078] Semi-finished cable 400

[0079] Cable structure 401

[0080] Coating material 402

[0081] Outer sheath 403

[0082] Annular space 500 DETAILED DESCRIPTION

[0083] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0084] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. When an element is referred to as being "disposed" on another element, it can be directly on the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0085] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0086] Some embodiments of the present application are described in detail. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0087] Embodiment

[0088] Referring to Figure 1 The embodiment provides a mold 100 comprising a mold sleeve 10 and a mold core 20. The mold sleeve 10 is provided with a mold cavity 13, the mold cavity 13 penetrates through the mold sleeve 10 along a first direction, and the mold sleeve 10 is provided with a first end 11 and a second end 12. The mold core 20 is arranged in the mold cavity 13 along the first direction, the mold core 20 is provided with a third end 21 and a fourth end 22, the third end 21 is arranged corresponding to the first end 11, and the fourth end 22 is arranged on a side of the second end 12 away from the first end 11. An outer surface of the mold core 20 and an inner surface of the mold sleeve 10 define an extrusion channel 30, the extrusion channel 30 is used for extruding a cladding material 402 from the second end 12 to the first end 11. The mold core 20 is further provided with a cable channel 23 penetrating through along the first direction, the cable channel 23 is used for passing a cable structure 401. An end surface of the third end 21 is provided with an airflow channel 24, the airflow channel 24 is communicated with an external environment. The airflow channel 24 is arranged between the outer surface and the inner surface of the mold core 20. The airflow channel 24 is provided with a one-way flow guide structure 40, the one-way flow guide structure 40 is used for guiding airflow to flow only from the third end 21 to the fourth end 22.

[0089] The coating material 402 is coated on the cable structure 401 to form an outer sheath 403, which is the outermost coating structure of the submarine cable. The cable structure 401 usually includes the cable structure 401, a water-blocking tape, a reinforcing structure, etc., wherein the water-blocking tape has strong water absorption performance to achieve water-blocking effect in the later use of the submarine cable. During the early stage of the production process of wrapping and winding the cable structure 401, the water-blocking tape is prone to be wet. When the coating material 402 is coated on the outer circumferential surface of the cable structure 401, the coating material 402 needs to be softened at high temperature to be coated on the cable structure 401, so that the water-blocking tape will generate water vapor under the action of high temperature. Since the cable structure 401 is arranged along the first direction from the fourth end 22 to the third end 21 of the mold core 20, water vapor will be generated at the position of the cable structure 401 close to the third end 21. The cable structure 401 and the coating material 402 form a semi-finished submarine cable 400 on the side of the first end 11 away from the second end 12, and an annular space 500 surrounding the cable structure 401 is formed between the third end 21 and the position where the outer sheath 403 and the cable structure 401 of the semi-finished submarine cable 400 are completely coated. Since the coating material 402 forms the outer side surface of the annular space 500, the water vapor in the annular space 500 cannot be discharged through the coating material 402. Similarly, the cable structure 401 is arranged in the cable channel 23 of the mold core 20, and the cable structure 401 is continuously moved from the fourth end 22 to the third end 21 under the action of the traction force, so that the water vapor cannot be discharged from the cable channel 23 to the fourth end 22. Therefore, the air and water vapor generated in the annular space 500 can only be discharged to the outside environment through the air flow channel 24 opened at the third end 21, so that the water vapor can be prevented from remaining in the annular space 500 and causing the bulging of the outer sheath 403, and the production quality of the submarine cable is improved.

[0090] At the same time, the one-way flow guide structure 40 can accelerate the discharge of water vapor from the third end 21 to the outside environment through the air flow channel 24, thereby further accelerating the discharge rate of water vapor, so that the water vapor in the annular space 500 can be quickly discharged without being retained under the premise of high traction speed of the cable structure 401 and high production rate of the submarine cable, thereby improving the production efficiency of the submarine cable and ensuring the production quality of the submarine cable. In addition, since the coating material 402 needs to be vacuumized by the vacuum device when it is extruded into the extrusion channel 30, even if the vacuum device fails, the one-way flow guide structure 40 can also ensure the air extraction pressure when the coating material 402 is extruded, so as to reduce the pressure fluctuation and the quality accident rate, thereby reducing the accident rate of re-production of the cable caused by unexpected conditions.

[0091] In some embodiments, referring to Figure 3 , the one-way flow guide structure 40 includes a Tesla valve structure 41.

[0092] The Tesla valve can play a good one-way flow guiding role, and can accelerate the moving speed of water vapor from the third end 21 to the fourth end 22, thereby improving the water vapor discharge efficiency and further reducing the generation of the bulging problem of the outer sheath 403.

[0093] In some embodiments, referring to Figure 3 , the one-way flow guiding structure 40 includes a plurality of arc-shaped protrusion groups, the plurality of arc-shaped protrusion groups are distributed along a second direction, the second direction is perpendicular or oblique to the first direction, each arc-shaped protrusion group includes arc-shaped protrusions 42 distributed along the first direction, the arc-shaped protrusions 42 of one arc-shaped protrusion group of one of the two adjacent arc-shaped protrusion groups are located between two adjacent arc-shaped protrusions 42 of the other arc-shaped protrusion group, the arc-shaped protrusions 42 are recessed from the fourth end 22 to the third end 21, and the two opposite sides of the arc-shaped protrusions 42 are respectively abutted against one side of the airflow channel 24 close to the inner surface and one side of the airflow channel 24 close to the outer surface.

[0094] When the airflow moves from the fourth end 22 to the third end 21, the airflow flowing to the arc-shaped protrusions 42 can be simply divided into two branches, one of which flows towards the gap between the arc-shaped protrusion 42 and another arc-shaped protrusion 42, and the other branch flows along the recess of the arc-shaped protrusion 42 to the previous branch and converges with the previous branch. Since the two branches flow in opposite directions when they converge, a great resistance is formed, so that only a small amount of airflow can flow to the arc-shaped protrusion 42 closer to the third end 21. In this way, when the airflow flows to a certain arc-shaped protrusion 42 between the third end 21 and the fourth end 22, it will completely stop flowing, thereby achieving the one-way flow guiding effect.

[0095] When the airflow flows from the third end 21 to the fourth end 22, the airflow flowing to the arc-shaped protrusions 42 can also be simply divided into two branches, but both branches can flow along the arc-shaped protrusions 42 towards the fourth end 22 and converge at the gap of the next arc-shaped protrusion 42, thereby increasing the flow speed of the airflow.

[0096] In addition, in the present embodiment, the two opposite sides of the arc-shaped protrusions 42 are respectively abutted against one side of the airflow channel 24 close to the inner surface and one side of the airflow channel 24 close to the outer surface, so that the airflow can only gradually flow from the gap between the adjacent arc-shaped protrusions 42 to the fourth end 22, thereby ensuring the one-way flow guiding effect.

[0097] In addition, in the present embodiment, the one-way flow guiding structure 40 includes two arc-shaped protrusion groups, and in other embodiments of the present application, the one-way flow guiding structure 40 can also include three or more arc-shaped protrusion groups.

[0098] In some embodiments, the one-way flow guide structure 40 further comprises a plug-in base 43, and a plurality of arc-shaped protrusion groups are arranged in the plug-in base 43, and the plug-in base 43 is detachably arranged in the airflow channel 24.

[0099] The plug-in base 43 can be conveniently inserted into the airflow channel 24, thereby facilitating the formation of the one-way flow guide structure 40 in the mold 100, and the plug-in base 43 can be replaced with other solid inserts in the production process of other cables to adapt to the production of other types of cables, or the plug-in base 43 can be replaced with other plug-in structures, such as a plug-in structure with a central through hole, and a reinforcing rod is pulled in the central through hole, so that the reinforcing rod can be coated in the outer sheath 403 during the coating of the cable structure 401 and the coating material 402, thereby improving the performance of the outer sheath 403. Therefore, by installing a plurality of arc-shaped protrusion groups through the plug-in base 43, the application range of the mold 100 can be improved.

[0100] In the embodiment, referring to Figure 2 and Figure 4 , the two ends of the plug-in base 43 are respectively provided with butterfly-shaped plug-in grooves 431 in the circumferential direction of the mold core 20, so that the plug-in base 43 can be stably installed in the mold core 20, avoiding the offset of the plug-in base 43 along the circumferential direction of the mold core 20, and improving the installation stability of the plug-in base 43 under the premise of detachable installation.

[0101] In some embodiments, referring to Figure 2 , the airflow channel 24 is provided with a plurality of airflow channels 24 arranged around the central axis of the cable, and the one-way flow guide structure 40 is provided with a plurality of one-way flow guide structures 40, each one-way flow guide structure 40 is detachably arranged in one airflow channel 24.

[0102] The plurality of airflow channels 24 can ensure the strength of the mold core 20 and provide a stable installation space for the one-way flow guide structure 40. Of course, in other embodiments of the present application, the airflow channel 24 can also be formed as an annular channel, and the one-way flow guide structure 40 can be integrally formed in the airflow channel 24 of the mold core 20 or can be constructed as an annular plug-in structure detachably arranged in the annular channel. When the one-way flow guide structure 40 is integrally formed in the mold core 20, the mold core 20 can be produced by metal injection molding and other processing methods. Therefore, the embodiments of the present application do not limit the specific structure of the mold core 20, the airflow channel 24 and the one-way flow guide channel.

[0103] In some embodiments, referring to Figure 1The cable channel 23 comprises a tapered section 231 and a straight section 232, the tapered section 231 is communicated with the straight section 232, one end of the tapered section 231 away from the straight section 232 is formed as the fourth end 22, one end of the straight section 232 away from the tapered section 231 is formed as the third end 21, and the airflow channel 24 extends from the third end 21 to the side wall of the tapered section 231 in the first direction, so that the length of the airflow channel 24 in the first direction can be reduced, and the water vapor in the annular space can be discharged more quickly, and the water vapor can be discharged to the outside environment from the fourth end 22 after being discharged to the tapered section 231. In addition, the tapered section 231 can also guide the cable structure 401.

[0104] Of course, in other embodiments of the present application, the cable channel 23 can also be formed in other shapes, and the airflow channel 24 can also pass through from the third end 21 to the fourth end 22.

[0105] In some embodiments, the mold core 20 and the mold jacket 10 are respectively made of alloy steel material, and the main components of the alloy steel material include C: 0.37-0.44, Si: 0.17-0.37, Mn: 0.50-0.80, Cr: 0.80-1.10, etc. The processing requirement of the alloy steel material is that the surface of the mold 100 is nitrided HV900 with a depth of 0.5 mm, so as to improve the reliability of the coated material 402 being extruded from the extrusion channel 30 and being coated; and the Rockwell hardness HRC is greater than 52.

[0106] In some embodiments, in the radial direction of the cable channel 23, the thickness of the plug-in seat 43 is 5-7 mm.

[0107] In addition, the mold 100 of the present embodiment can be applied to the production of single-core submarine cables and multi-core submarine cables.

[0108] In some embodiments, the mold 100 comprises a cable channel 23, an airflow channel 24, an extrusion channel 30, a plug-in seat 43, and a mold core 20. Figure 5 The present application also provides a production equipment 200, which comprises the mold 100, the pay-off device 51, the traction device 52, and the extrusion device 53.

[0109] The production equipment 200 comprises the mold 100 of any of the above-mentioned embodiments, and thus has the beneficial effects of the mold 100 of any of the above-mentioned embodiments, which will not be described herein again.

[0110] The pay-off device 51 can output the cable structure 401 to meet the automatic pay-off requirement of the cable structure 401.

[0111] The traction device 52 can pull the cable structure 401 to keep the cable structure 401 moving and cooperate with the sheathing material 402 to form the semi-finished cable 400 on the side of the third end 21 of the mold core 20 away from the fourth end 22.

[0112] The extrusion device 53 can extrude the sheathing material 402 so that the sheathing material 402 can be extruded through the extrusion channel 30 of the mold 100 and coated on the cable structure 401 on the side of the third end 21 of the mold core 20 away from the fourth end 22.

[0113] In the embodiment, the pay-off device 51 can include a ground cage or a ground turntable, and the ground cage can further be provided with a foldable automatic wire winding device to further meet the automatic pay-off requirement of the cable structure 401. In addition, the pay-off device 51 can be placed in a heating and dehumidifying oven, and hot air can be provided to the oven by a fan and a heating box. Specifically, four fans and four heating boxes can be respectively placed around the ground of the oven to set the temperature in the oven to a preset value to achieve better dehumidification effect. The preset value can be set to (70±2)℃ according to different types of submarine cable production requirements.

[0114] In other embodiments of the application, the heater can be replaced by a steam pipe network to emit heat, and a fan is further provided to provide stable hot air flow to the oven. Four fans and four steam pipe networks are respectively placed around the bottom surface of the oven, and the heating temperature of the steam pipe network is more stable, which can avoid damage to the cable structure 401 caused by uncontrolled heating temperature.

[0115] In the embodiment, the production equipment 200 further includes a heating device 54, which is arranged between the pay-off device 51 and the extrusion device 53 and is used to heat the cable structure 401. The heating device 54 can adopt a resistance heating structure, and a temperature measuring device is further provided to cooperate with the resistance heating structure to keep the internal temperature of the heating device 54 within the range of (100±10)℃. The heating device 54 can heat the cable structure 401 to avoid premature solidification of the sheathing material 402 coated on the relatively cold cable structure 401, thereby improving the coating effect of the sheathing material 402 on the cable structure 401.

[0116] In the embodiment, the production device 200 further comprises a meter marking device 55, a spark test device 56 and a take-up device 57, which are sequentially arranged downstream of the cooling device 60. The meter marking device 55 comprises a synchronizer and a laser marking machine, and the laser marking machine is used for marking on the outer sheath 403 of the semi-finished cable 400 after cooling. The spark test device 56 comprises a power frequency spark tester, which has voltage adjustment and alarm functions. The inlet and outlet of the spark test device 56 are connected with gratings, which have an emergency power-off function to ensure safety in production when the production device 200 fails. The take-up device 57 is used for winding the cable after marking and passing through the spark test device 56, and the take-up device 57 can be a ground cage or a ground turntable according to the diameter D of the cable. The minimum bending radius of the wire coil wound by the take-up device 57 is not less than 15D, so as to avoid damage or reduce the service life of the cable material during work. The unwinding height of the take-up device 57 is 30πD, so as to avoid that the actual unwinding height and bending radius of the cable are less than the theoretical unwinding height and bending radius.

[0117] The spark test device 56 is a power frequency spark tester, which has voltage adjustment and alarm functions. The inlet and outlet are connected with gratings, which have an emergency power-off function.

[0118] In the embodiment, two traction devices 52 are arranged, one of which is arranged between the pay-off device 51 and the heating device 54, and the other of which is arranged between the spark test device 56 and the take-up device 57. The synchronizer of the meter marking device 55 is connected with the traction device 52 between the spark test device 56 and the take-up device 57.

[0119] In the embodiment, the traction device 52 comprises a crawler-type traction machine to provide traction to the cable structure 401 and realize tension control of the cable structure 401. The two traction devices 52 each comprise a backup device to facilitate switching to the backup device when the current device fails, thereby ensuring normal production of the submarine cable.

[0120] In the embodiment, the extrusion device 53 comprises a vacuumizing device, a feeding and weighing device, an extrusion mechanism, a control system and the aforementioned mold 100. The vacuumizing pressure of the vacuumizing device is controlled at (0.30-0.50) MPa. The feeding and weighing device adopts gravity control feeding to avoid the problem of material breakage of the coating material 402 during the production of the submarine cable.

[0121] The extrusion mechanism includes a heater and a BM screw, the heater is used to control the temperature of the cladding material 402 between 140-210℃, the machine body of the extrusion mechanism is provided with 7 temperature zones, and the extrusion head of the extrusion mechanism is provided with 6-8 temperature zones to achieve better temperature control effect. The machine body of the extrusion mechanism has a feeding section, a melting section and a homogenizing section, the feeding section is used to add the cladding material 402, the melting section is used to melt the cladding material 402 by the heater, and the homogenizing section is used to homogenize the melted cladding material 402 to ensure the uniformity of the extruded cladding material 402. The feeding section adopts water cooling to reduce the temperature, and the melting section and the homogenizing section both adopt air cooling to keep the temperature of the extrusion mechanism stable.

[0122] The control system is provided with two, the two control systems can be switched at any time to switch to another standby control system when the production equipment 200 fails, ensuring the normal production.

[0123] In some embodiments, referring to Figure 5 The mold 100 further comprises a cooling device 60, the cooling device 60 comprises a cooling tank 61 for storing cooling liquid to cool the semi-finished cable 400, and the cooling device 60 further comprises a splash-proof device 70 arranged at the input port 614 of the cooling tank 61, the splash-proof device 70 is used to reduce the splash height of the cooling liquid discharged from the input port 614.

[0124] Since the outer sheath 403 of the semi-finished cable 400 output by the extrusion device 53 has not been completely solidified, if the cooling liquid splashes onto the surface of the outer sheath 403, it will cause spot damage and other water point damage to the surface of the outer sheath 403, and further cause poor quality of the outer sheath 403 of the cooled semi-finished cable 400. Through the splash-proof device 70, the splash height of the cooling liquid can be small and will not splash onto the outer surface of the semi-finished cable 400 output from the extrusion device, thereby avoiding the problem of water points on the outer surface of the semi-finished cable 400, to further improve the performance of the outer sheath 403 of the submarine cable.

[0125] In some embodiments, referring to Figure 6In the transmission direction of the semi-finished cable 400, the cooling tank 61 is divided into a high-temperature section 611, a medium-temperature section 612 and a low-temperature section 613 in sequence, and the temperature of the cooling liquid in the high-temperature section 611, the medium-temperature section 612 and the low-temperature section 613 decreases in sequence, so as to realize the segmented cooling effect for the cooling of the semi-finished cable 400. Since the surface of the semi-finished cable 400 still remains the high temperature of the coating material 402 after the production of the semi-finished cable 400, the semi-finished cable 400 is first sent into the high-temperature section 611 with a higher temperature of the cooling liquid, so as to reduce the temperature of the semi-finished cable 400 to the temperature of the cooling liquid in the high-temperature section 611, then the semi-finished cable 400 is sent into the medium-temperature section 612, so as to reduce the temperature of the semi-finished cable 400 to the temperature of the cooling liquid in the medium-temperature section 612, and then the semi-finished cable 400 is sent into the low-temperature section 613, so as to reduce the temperature of the semi-finished cable 400 to the temperature of the cooling liquid in the low-temperature section 613. In this way, the temperature of the semi-finished cable 400 will not decrease sharply and the problem of excessive stress of the outer sheath 403 will not occur. Through the arrangement of the cooling tank 61, the cooling of the semi-finished cable 400 is realized and the internal stress of the outer sheath 403 of the semi-finished cable 400 after the cooling is reduced.

[0126] In the embodiment, the high-temperature section 611 and the medium-temperature section 612 are independent of each other, so as to reduce the difficulty of maintaining the temperature of the cooling liquid in the high-temperature section 611. Since the difference between the temperature of the cooling liquid in the medium-temperature section 612 and the temperature of the cooling liquid in the low-temperature section 613 is small, the medium-temperature section 612 and the low-temperature section 613 can be connected with each other or independent of each other.

[0127] The splash-proof device 70 and the input port 614 of the cooling tank 61 are arranged at the end of the high-temperature section 611 away from the medium-temperature section 612. After the semi-finished cable 400 is cooled by the cooling liquid in the high-temperature section 611, the outer sheath 403 will be partially solidified under the action of the cooling liquid, so that the outer sheath 403 will not be damaged by the splashing of the cooling liquid. Therefore, the splash-proof device 70 does not need to be additionally arranged between the high-temperature section 611 and the medium-temperature section 612, so as to save the cost. Of course, in other embodiments of the present application, two splash-proof devices 70 can be arranged between the high-temperature section 611 and the medium-temperature section 612 according to the actual solidification speed of different coating materials 402, so as to ensure that the cooling liquid will not splash and affect the coating material 402 with a slow solidification speed, thereby making the production equipment have a wider application range.

[0128] In addition, in the embodiment, the high-temperature section 611 has two liquid outlets, one of which is arranged towards the extrusion device 53 and forms the input port 614 for inputting the semi-finished cable 400, and the other liquid outlet is arranged towards the medium-temperature section 612.

[0129] In the embodiment, the temperature of the semi-finished cable 400 sent out from the extrusion device 53 is higher than the temperature of the cooling liquid in the high-temperature section 611.

[0130] In this embodiment, the cooling source is provided with a heating cylinder for heating the cooling liquid in the cooling source, and the heated cooling liquid is input into the high-temperature section 611. The heating cylinder comprises a steam heat exchanger and an air heat pump, which jointly heat the cooling liquid and maintain the temperature of the cooling liquid in the high-temperature section 611 between 40°C and 80°C, so as to reduce the power consumption of the factory.

[0131] In this embodiment, the cooling liquid in the medium-temperature section 612 is cooled by a cooling tower, so as to achieve the further cooling effect on the semi-finished cable 400.

[0132] In this embodiment, the low-temperature section 613 is in communication with a low-temperature cooling source, the low-temperature cooling source is provided with a floating ball liquid level control to realize the function of supplementing the cooling liquid, and the temperature of the low-temperature cooling source is maintained between 0°C and 10°C.

[0133] In this embodiment, a blow dryer is further arranged downstream of the cooling device 60 in the conveying direction of the semi-finished cable 400, and the blow dryer is connected with an air compressor to blow the surface cooling liquid of the cooled semi-finished cable 400 by high-speed airflow. The blow dryer is further provided with an oil-water separator and a gas control valve, the oil-water separator can avoid blowing impurities to the surface of the outer sheath 403, so as to ensure the quality and performance of the outer sheath 403. The blow dryer can also control the blowing direction of the airflow by a universal bamboo joint cooling pipe, so as to achieve the best blow drying performance.

[0134] In some embodiments, referring to Figure 7 , the tank body of the cooling tank 61 extends along a first direction, the cooling tank 61 forms an input port 614 at one end in the first direction, the splash-proof device 70 is arranged on the side of the input port 614 facing the extrusion device 53, and in the direction of gravity, the splash-proof device 70 is located below the cooling tank 61; the splash-proof device 70 comprises a liquid receiving groove 71, and the opening of the liquid receiving groove 71 is provided with an adsorption structure 72, which is used to adsorb the cooling liquid discharged from the input port 614, so that the splashing height of the cooling liquid is less than the distance between the adsorption structure 72 and the semi-finished cable 400 located in the cooling tank 61 in the direction of gravity.

[0135] It can be understood that the adsorption structure 72 can quickly adsorb the cooling liquid falling into the liquid receiving groove 71, thereby greatly reducing the splashing amount of the cooling liquid, and the splashing cooling liquid is also the residual cooling liquid after being adsorbed by the adsorption structure 72, so its splashing height can also be far less than the distance between the adsorption structure 72 and the semi-finished cable 400 located in the cooling tank 61 in the direction of gravity, thereby significantly reducing the problem of water spots caused by the cooling liquid on the surface of the outer sheath 403 of the semi-finished cable 400, and improving the quality of the outer sheath 403.

[0136] In this embodiment, the adsorption structure 72 can be a sponge or a wire ball structure.

[0137] In some embodiments, referring to Figure 8 and Figure 9 , the cooling tank 61 is provided with a cooling liquid passage penetrating in the first direction, the cooling tank 61 is formed with an input port 614 at one end in the first direction, the splash-proof device 70 is arranged at the side of the input port 614 facing the extrusion device 53, and in the direction of gravity, the splash-proof device 70 is located below the cooling tank 61; the splash-proof device 70 comprises a liquid receiving groove 71 and a spiral liquid delivery pipe 73, the liquid receiving groove 71 is in communication with the input port 614, the groove bottom of the liquid receiving groove 71 is inclined in the direction away from the input port 614 in the direction of gravity, and the spiral liquid delivery pipe 73 is in communication with the liquid receiving groove 71.

[0138] It can be understood that, due to the groove bottom of the liquid receiving groove 71 being inclined in the direction away from the input port 614 in the direction of gravity, the distance of the cooling liquid falling into the groove bottom of the liquid receiving groove 71 is greater than the distance of the semi-finished cable 400 and the groove bottom of the cooling tank 61 in the direction of gravity, so that the cooling liquid falling into the liquid receiving groove 71 only has a small amount of splashing to the possibility of the high cooling liquid splashing to the outer sheath 403 of the semi-finished cable 400. In this embodiment, the cooling liquid in the liquid receiving groove 71 is quickly output through the spiral liquid delivery pipe 73 to avoid the accumulation of liquid in the liquid receiving groove 71 causing the splashing height of the cooling liquid to be too high, so that the splash-proof device 70 of this embodiment can greatly reduce the cooling liquid splashing to the outer sheath 403, thereby also better solving the problem of water spots on the surface of the outer sheath 403 and improving the quality of the outer sheath 403.

[0139] In this embodiment, the other end of the spiral liquid delivery pipe 73 is also in communication with the cooling source to realize the recycling of the cooling liquid.

[0140] In some embodiments, referring to Figure 10 to Figure 12 , the cooling device 60 further comprises a temporary storage part 63, the temporary storage part 63 defines a temporary storage cavity 64, the temporary storage cavity 64 is used to communicate with a cooling source, the cooling source is used to input cooling liquid into the temporary storage cavity 64, the groove side wall of the cooling tank 61 is provided with a communication hole 65, the cooling tank 61 communicates with the temporary storage cavity 64 through the communication hole 65, the communication hole 65 is located above the groove bottom wall of the cooling tank 61, and a filter screen 66 is arranged in the communication hole 65, the filter screen 66 is used to filter the liquid flow flowing from the temporary storage cavity 64 to the cooling tank 61 and reduce the bubble content of the cooling liquid flowing from the temporary storage cavity 64 into the cooling tank 61.

[0141] It can be understood that, since the communication hole 65 is located above the groove bottom wall of the cooling groove 61, when the cooling liquid passes through the communication hole 65 from the temporary storage cavity 64 into the cooling groove 61, the flow rate of the cooling liquid is slow, and the possibility of the cooling liquid falling into the cooling groove 61 and generating bubbles is greatly reduced, thereby avoiding the phenomenon that the bubbles of the cooling liquid in the cooling groove 61 adhere to the outer surface of the outer sheath 403 of the semi-finished cable 400 in the cooling groove 61, so as to greatly reduce the water spot problem of the outer sheath 403 and improve the performance of the outer sheath 403.

[0142] In addition, after the cooling liquid is input into the temporary storage cavity 64 at a high flow rate, the cooling liquid needs to be stored in the temporary storage cavity 64 for a period of time, and after the cooling liquid is stored for a period of time, the bubbles will be discharged from the surface of the cooling liquid, thereby reducing the number of bubbles of the cooling liquid in the temporary storage cavity 64, further reducing the number of bubbles of the cooling liquid transported from the temporary storage cavity 64 into the cooling groove 61, and further greatly reducing the number of bubbles adhering to the outer sheath 403, thereby improving the performance of the outer sheath 403.

[0143] In some embodiments, referring to Figure 10 The temporary storage part 63 is a layer 631 arranged between the inner surface of the cooling groove 61 and the outer surface of the cooling groove 61. A plurality of steam heat exchange pipes 633 can also be arranged in the layer 631 to maintain the temperature of the cooling liquid in the layer 631 and also to have a heat preservation effect on the temperature of the cooling liquid in the cooling groove 61. When the above structure is located in the high-temperature section 611, through the above heat preservation structure, it can be ensured that the temperature of the cooling liquid in the high-temperature section 611 is maintained between 40°C and 80°C, so as to avoid the problem that the stress of the outer sheath 403 is too large due to too low temperature.

[0144] In some embodiments, referring to Figure 11 The temporary storage part 63 is a housing 632 arranged adjacent to the cooling groove 61.

[0145] In some embodiments, referring to Figure 12 The temporary storage part 63 is a pipe 633 arranged on both sides of the cooling groove 61. The opening of the pipe 633 is provided with a liquid inlet 6331 and a liquid supplementing port 6332, the liquid inlet 6331 and the liquid supplementing port 6332 are respectively communicated with a cooling source, the liquid supplementing port 6332 can be used for supplementing the cooling liquid, and different temperature cooling liquids are supplemented according to the temperature of the cooling liquid in the cooling groove 61, so as to maintain the temperature of the cooling liquid in the cooling groove 61 between 40°C and 80°C.

[0146] Therefore, the specific structure of the temporary storage part 63 can be determined according to actual needs, and the embodiments of the present application do not specifically limit it.

[0147] In some embodiments, referring to Figure 7 to Figure 9The outlet of the cooling groove 61 is provided with a baffle 62, and the baffle 62 is provided with an avoiding groove 621 for avoiding the semi-finished cable 400, so that the semi-finished cable 400 can be conveyed to the next device through the avoiding groove 621.

[0148] The above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A mold, characterized in that, include: A mold sleeve, wherein a mold cavity is formed inside the mold sleeve, the mold cavity extends through the mold sleeve along a first direction, and the mold sleeve has a first end and a second end; A mold core is inserted into the mold cavity along a first direction. The mold core has a third end and a fourth end. The third end corresponds to the first end, and the fourth end is located on the side of the second end away from the first end. The outer surface of the mold core and the inner surface of the mold sleeve define an extrusion channel for extruding covering material from the second end toward the first end. The mold core also has a cable channel extending along the first direction for a cable structure to pass through. An airflow channel is formed on the end face of the third end, communicating with the external environment. The airflow channel is located between the outer and inner surfaces of the mold core and has a unidirectional flow-guiding structure to guide the airflow only... The airflow flows from the third end toward the fourth end; the unidirectional flow structure includes a Tesla valve structure; the unidirectional flow structure includes multiple rows of arc-shaped protrusion groups, the multiple rows of arc-shaped protrusion groups are distributed along a second direction, the second direction is perpendicular or oblique to the first direction, each row of arc-shaped protrusion groups includes arc-shaped protrusions distributed along the first direction, the arc-shaped protrusions of one row of two adjacent rows of arc-shaped protrusion groups are located between two adjacent arc-shaped protrusions of the other row of arc-shaped protrusion groups, the arc-shaped protrusions are recessed from the fourth end toward the third end, and the two sides of the arc-shaped protrusions opposite each other abut against the side of the airflow channel near the inner surface and the side of the airflow channel near the outer surface, respectively.

2. The mold according to claim 1, characterized in that: The unidirectional airflow structure also includes a connector, with multiple rows of arc-shaped protrusions arranged on the connector, and the connector is detachably inserted into the airflow channel.

3. The mold according to claim 1, characterized in that: The airflow channels are provided in multiple ways, and the multiple airflow channels are arranged around the central axis of the cable. The unidirectional flow guide structure is provided in multiple ways, and each unidirectional flow guide structure is detachably installed in one of the airflow channels.

4. A production equipment, characterized in that, include: The mold as described in any one of claims 1-3; A cable feeding device, used to output a cable structure; A traction device is used to pull the cable structure through the fourth end of the mold core and out the third end of the mold core. An extrusion device for extruding a coating material into the extrusion channel of the mold and coating the cable structure to form a semi-finished cable.

5. The production equipment according to claim 4, characterized in that: The mold also includes a cooling device, which includes a cooling tank for storing coolant to cool the semi-finished cable. The cooling device also includes a splash-proof device located at the inlet of the cooling tank for receiving the semi-finished cable. The splash-proof device is used to reduce the splash height of the coolant discharged from the inlet.

6. The production equipment according to claim 5, characterized in that: The cooling tank extends along a first direction, and the inlet is formed at one end of the cooling tank in the first direction. The splash-proof device is located on the side of the inlet facing the extrusion device, and in the direction of gravity, the splash-proof device is located below the cooling tank. The splash-proof device includes a liquid receiving tank, and the opening of the liquid receiving tank is provided with an adsorption structure. The adsorption structure is used to adsorb the coolant discharged from the inlet, so that the splash height of the coolant is less than the distance between the adsorption structure and the semi-finished cable located in the cooling tank in the direction of gravity.

7. The production equipment according to claim 5, characterized in that: The cooling tank has a cold liquid channel running through it in a first direction. The inlet is formed at one end of the cooling tank in the first direction. The splash-proof device is located on the side of the inlet facing the extrusion device. In the direction of gravity, the splash-proof device is located below the cooling tank. The splash-proof device includes a liquid receiving tank and a spiral liquid delivery pipe. The liquid receiving tank is connected to the inlet. The bottom of the liquid receiving tank is inclined in the direction of gravity in the direction away from the inlet. The spiral liquid delivery pipe is connected to the liquid receiving tank.

8. The production equipment according to claim 5, characterized in that: The cooling device further includes a temporary storage section defining a temporary storage cavity. The temporary storage cavity is connected to a cooling source, which supplies coolant to the temporary storage cavity. A connecting hole is formed in the side wall of the cooling tank, through which the cooling tank communicates with the temporary storage cavity. The connecting hole is located above the bottom wall of the cooling tank. A filter screen is provided inside the connecting hole, which filters the liquid flowing from the temporary storage cavity into the cooling tank and reduces the bubble content of the coolant flowing from the temporary storage cavity into the cooling tank.

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