A process and apparatus for the production of a cable

Abstract

The present invention relates to a process and device for producing a cable, the process comprising: dividing an intermediate conductor into two or more sections along the length direction, assembling a filler column on each section of the intermediate conductor, wrapping a steel strip around the surface of the filler column, and processing the steel strip into a steel pipe to obtain the cable; the number of intermediate conductors is n (n>1), and when n is greater than 1, each intermediate conductor is parallel to each other; assembling the filler column comprises: arranging two or more petals around all the intermediate conductors to form a complete filler column with n through holes and a circular cross-sectional outer edge, and arranging the n intermediate conductors in the n through holes respectively; the device comprises a pipe making machine, a pipe shrinking device, an annealing device and a winding device arranged at intervals along the running direction of the intermediate conductor; the pipe making machine comprises 10-15 groups of press wheels, and an argon arc welding device is arranged between the last two groups of press wheels along the running direction of the intermediate conductor. The device is simple, and the process is suitable for producing a cable with an ultra-long length.

Description

Technical Field

[0001] This invention belongs to the field of mineral-insulated cable technology, and relates to a cable manufacturing process and apparatus. Background Technology

[0002] Mineral-insulated cables include mineral-insulated thermocouple cables, mineral-insulated heating cables, mineral-insulated signal cables, and mineral-insulated fire-resistant cables, which are used for temperature measurement and control, heating, signal transmission, and power transmission, respectively. Mineral-insulated thermocouple cables are widely used in industries such as metallurgy, thermal power, nuclear power, petrochemicals, energy and environmental protection, and medical and food industries; mineral-insulated heating cables, mineral-insulated signal cables, and mineral-insulated fire-resistant cables are widely used in special applications such as high-rise buildings, airports, tunnels, and oil wells.

[0003] Mineral-insulated cables generally consist of an intermediate conductor, filler, and protective tube. The filler is typically a mineral insulating material used for insulation between the intermediate conductor and the protective tube. Different fillers can be selected during cable manufacturing depending on the specific insulation requirements.

[0004] There are two main methods for manufacturing cables in the existing technology, as follows:

[0005] (1) Inorganic oxide precast ceramic column method;

[0006] Patent CN108726993 discloses a method for prefabricating ceramic columns. The ceramic column, heating wire, and seamless steel pipe are assembled together, then drawn to reduce diameter and annealed to achieve the finished product dimensions. The structure of the ceramic column is as follows: Figure 2 As shown, this method is difficult to operate and has high requirements for site, space and equipment. This method is suitable for products with small diameter and short length. When the length is very large, it is not suitable to use the ceramic column prefabrication process.

[0007] (2) Inorganic oxide powder filling method;

[0008] Patents CN10868517A (Fireproof Cable Production Equipment) and CN213339840U (Mineral Fireproof Cable Production Line) both provide equipment and processes for powder filling production. Metal strips are rolled into tubes, then automatically filled with insulating powder, rolled again by a rolling mill, and finally annealed and wound up. Using the oxide powder filling method, theoretically, products of infinite length can be produced. However, the magnesium oxide density is lower than that of products using the ceramic column prefabrication process, and the high-temperature insulation is lower than that of products using the ceramic column prefabrication process.

[0009] Therefore, it is of great significance to study a cable production process and apparatus to solve the problem that existing cables cannot achieve both large length and high filler density. Summary of the Invention

[0010] The present application aims at solving the problems in the prior art and providing a cable production process and device.

[0011] To achieve the above-mentioned purpose, the present application adopts the technical scheme as follows:

[0012] A cable production process, the intermediate conductor is divided into two or more sections along the length direction, a filling column is assembled on each section of the intermediate conductor from one end to the other end of the intermediate conductor, after the surface of the filling column is wrapped with a steel strip, the steel strip is processed into a steel pipe, and the cable is obtained.

[0013] The number of intermediate conductors is n, and n is a positive integer greater than or equal to 1, when n is a positive integer greater than 1, each intermediate conductor is parallel to each other.

[0014] The assembled filling column is arranged around all the intermediate conductors by two or more petals, and is combined into a complete filling column with n through holes and a circular cross-sectional outer edge, and the n intermediate conductors are respectively located in the n through holes.

[0015] As a preferred technical scheme:

[0016] The diameter of the intermediate conductor (note that if the cross section of the intermediate conductor is not circular, the diameter here is the equivalent circle diameter, and the same applies elsewhere) is 1-15 mm, and the length is 100-5000 m.

[0017] The outer diameter of the filling column is 13.3-60 mm, and the length is 40-250 mm, and the diameter of the through hole is 0.5-1.5 mm larger than the diameter of the corresponding intermediate conductor.

[0018] In the combination, the adjacent two petals are connected by a groove and a protrusion matched with the groove.

[0019] The thickness of the steel strip is 0.5-5 mm, and the material of the steel strip is 316, 316L, 310S, 310H, Inconel600, Inconel601 or 3039.

[0020] In the cable production process, the steel strip is processed into a steel pipe by sequentially shaping, curling and longitudinal seam welding the steel strip.

[0021] The production process of the cable is as described above, and after the steel belt is processed into a steel pipe, the steel pipe is sequentially subjected to a reducing treatment, an annealing treatment and a winding treatment; the reducing treatment is to reduce the diameter of the steel pipe obtained from the previous process to the diameter of the finished product by rolling, for example, a steel pipe with an outer diameter of 38 mm is rolled into a steel pipe with an outer diameter of 26 mm, and the pipe reducing speed is 1-10 m / min; the annealing treatment is performed at a temperature of 1040-1150 DEG C for 1-35 min; and the winding speed of the winding treatment is equal to the pipe reducing speed.

[0022] The production process of the cable is as described above, and the entire process is a continuous processing process, that is, the assembling of the filler column, the wrapping of the steel belt, the processing of the steel belt into a steel pipe, the reducing treatment, the annealing treatment and the winding treatment are different processes in the continuous processing process.

[0023] The production process of the cable is as described above, and the cable is a heating cable, the number of the intermediate conductors is 1, the intermediate conductor is a heating wire, and the filler column is made of one or a mixture of several of MgO, Al2O3, SiO, AlN and NB; or the cable is an armored thermocouple cable, the number of the intermediate conductors is 2, one is a positive electrode wire and the other is a negative electrode wire, and the wires are made of K type, N type, J type and T type; or the cable is an armored continuous thermocouple cable, the number of the intermediate conductors is 2, one is a positive electrode wire and the other is a negative electrode wire, and the filler column is made of one or a mixture of several of MgO, Al2O3, SiO, AlN and NB.

[0024] The application further provides a device for using the production process of the cable, which comprises a pipe making machine, a pipe reducing device, an annealing device and a winding device arranged at intervals along the running direction of the intermediate conductors; the pipe making machine comprises 10-15 groups of pressure rollers, and an argon arc welding device is arranged between the last two groups of pressure rollers along the running direction of the intermediate conductors; the argon arc welding device comprises an argon welding machine and an automatic weld seam correction device; the pipe reducing device comprises 14-20 groups of rollers, and the compression ratio (diameter before compression / diameter after compression) is 1.05-1.3; the annealing device comprises an annealing furnace (a tubular resistance type annealing furnace or a tubular high-frequency induction heating furnace) and a cooling water tank; and the winding device comprises a take-up reel and a power device, and the diameter of the take-up reel is 1500-2500 mm.

[0025] Advantages

[0026] (1) The production process of the cable is suitable for the production of mineral insulated cables with a diameter greater than and a length longer than, and is particularly suitable for the production of high-voltage low-current high-temperature heating cables with a diameter greater than 5 mm and a length greater than 500 meters.

[0027] (2) The present invention is applied to a cable production process and is suitable for producing mineral-insulated cables of extra-long length. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a cable production apparatus according to the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of a ceramic column in the prior art;

[0030] Figure 3 This is an exploded structural diagram of a filling column according to the present invention (grooves and protrusions are not shown);

[0031] Figure 4 This is a cross-sectional schematic diagram of a filling column according to the present invention;

[0032] Figure 5 This is a cross-sectional schematic diagram of another type of filling column of the present invention (the grooves and protrusions are not shown);

[0033] Figure 6 This is a schematic diagram of the product obtained after diameter reduction treatment in the manufacturing process of a cable according to the present invention.

[0034] Figure 7 This is a schematic diagram of another product obtained after diameter reduction treatment in the cable manufacturing process of the present invention.

[0035] Among them, 1-intermediate conductor, 2-steel strip, 3-filler column, 4-tube making device, 5-argon arc welding device, 6-tube shrinking device, 7-annealing device, 8-winding device, 9-steel pipe, 10-powder formed after extrusion of filler column. Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0037] Example 1

[0038] A cable production apparatus, such as Figure 1 As shown, the device includes a tube-making device 4, a tube-shrinking device 6, an annealing device 7, and a winding device 8, arranged at intervals along the running direction of the intermediate conductor 1, wherein:

[0039] The tube-making device 4 includes 10 to 15 sets of pressure rollers. An argon arc welding device 5 is provided between the last two sets of pressure rollers along the running direction of the intermediate conductor 1. The argon arc welding device 5 includes an argon welding machine and an automatic weld seam correction device.

[0040] The tube shrinking device 6 includes 14 to 20 sets of rollers, and the compression ratio (diameter before compression 39 / diameter after compression 31) is 1.23;

[0041] The annealing apparatus 7 includes an annealing furnace (a tubular resistance annealing furnace or a tubular high-frequency induction heating furnace) and a cooling water tank.

[0042] The winding device 8 includes a take-up reel and a power unit, with the diameter of the take-up reel being 1500–2500 mm.

[0043] The manufacturing process of a heating cable using the device described above is a continuous process, namely, assembling the filler column 3, wrapping the steel strip 2, processing the steel strip 2 into a steel pipe 9, diameter reduction treatment, annealing treatment, and winding treatment are different steps in the continuous process; wherein:

[0044] When assembling the filling column 3, a heating wire is divided into two or more sections along its length, and the filling column 3 is assembled on each section of the heating wire from one end to the other. The diameter of the heating wire is 1 to 15 mm, the length is 100 to 5000 mm, and the material is Cu, Ni, Cu-Ni alloy, or Ni-Cr alloy. The outer diameter of the filling column 3 is 13.3 to 60 mm, the length is 40 to 250 mm, and the material is one or a mixture of several of MgO, Al2O3, SiO, AlN, and NB.

[0045] Assemble the filling column 3 by arranging the two petals around the heating wire, such as Figures 3-4 As shown, two valve bodies are connected by a groove on one valve body and a protrusion on the other valve body that mates with the groove, forming a complete filling column 3 with a through hole and a circular outer edge of the cross-section. The heating wire is located inside the through hole, and the diameter of the through hole is 0.5 to 1.5 mm larger than the diameter of the heating wire; alternatively, the filling column 3 can be assembled by arranging three valve bodies around the heating wire, as shown in the diagram. Figure 5 As shown, the three valves are connected in pairs by grooves and protrusions to form a complete filling column with a through hole and a circular outer edge of cross-section. The heating wire is located inside the through hole, and the diameter of the through hole is 0.5 to 1.5 mm larger than the diameter of the heating wire.

[0046] When wrapping steel strip 2, the thickness of steel strip 2 is 0.5-5mm, and the material is 316, 316L, 310S, 310H, Inconel 600, Inconel 601 or 3039;

[0047] The steel strip 2 is processed into steel pipe 9, that is, the steel strip 2 is shaped, rolled, and longitudinally welded using the pipe making device 4.

[0048] The reducing process is to roll the prepared steel pipe 9 through the reducing device 6 to reduce the diameter to 4-30 mm of the finished product, and the reducing speed is 1-10 m / min; in the reducing process, the filling column 3 is extruded by the steel pipe 9 to form the powder, as shown in Figure 6 the powder 10 formed after the extrusion of the filling column fills the internal space of the steel pipe 9;

[0049] The annealing process is to anneal the steel pipe 9 after the reducing process through an annealing furnace (a tubular resistance type annealing furnace or a tubular high-frequency induction heating furnace) and a cooling water tank; the temperature of the annealing process is 1040-1150 °C, and the time is 1-35 min;

[0050] The winding process is to wind the steel pipe 9 after the annealing process through the winding device 8, and the winding speed is equal to the reducing speed.

[0051] In the prior art, the product insulation material density of the drawing process is 2.3-2.5 g / cm, and the product insulation material density produced by the production process of the heating cable of embodiment 1 is 2.6-2.8 g / cm 3 .

[0052] Embodiment 2

[0053] A production device of a cable, same as embodiment 1.

[0054] A production process of an armored thermocouple cable using the device as described above, the whole process is a continuous processing process, that is, the assembling of the filling column, the wrapping of the steel belt, the processing of the steel belt into a steel pipe, the reducing process, the annealing process, and the winding process are different processes in the continuous processing process, wherein:

[0055] When the filling column is assembled, one positive wire and one negative wire parallel to each other and flush at both ends are divided into two or more sections along the length direction, and the filling column is assembled on each section of the positive wire and the negative wire from one end to the other end of the positive wire and the negative wire; the diameter of the positive wire is 2-10 mm, the length is 100-5000 m, and the material is KP type, NP type, JP type or PT type; the diameter of the negative wire is 2-10 mm, the length is 100-5000 m, and the material is KN type, NN type, JN type or PN type; the outer diameter of the filling column is 13.3-60 mm, the length is 40-250 mm, and the material is one or a mixture of several of MgO, Al2O3, SiO, AlN, and NB;

[0056] The assembling of the filling column is to arrange two petals around the positive wire and the negative wire, as shown in Figure 7As shown, two petals are connected to form a complete filling column with two through holes (through hole I, through hole II) and a circular cross-sectional outer edge by a groove provided on one of the petals and a protrusion provided on the other petal and matched with the groove, the positive electrode filament is located in the through hole I, the diameter of the through hole I is 0.5-1.5 mm larger than the diameter of the positive electrode filament, and the negative electrode filament is located in the through hole II, the diameter of the through hole II is 0.5-1.5 mm larger than the diameter of the negative electrode filament;

[0057] When wrapping the steel strip, the thickness of the steel strip is 0.5-5 mm, and the material is 316, 316L, 310S, 310H, Inconel600, Inconel601 or 3039;

[0058] The steel strip is processed into a steel pipe, that is, the steel strip is shaped, rolled, and longitudinally welded by using a pipe making device;

[0059] The reducing treatment is that the prepared steel pipe is rolled by a pipe reducing device to reduce the diameter to 4-30 mm of the finished product, and the pipe reducing speed is 1-10 m / min; during the reducing process, the filling column is extruded to form powder, and the powder formed after the extrusion of the filling column fills the internal space of the steel pipe;

[0060] The annealing treatment is that the steel pipe subjected to the reducing treatment is subjected to annealing treatment by an annealing furnace (a tubular resistance type annealing furnace or a tubular high-frequency induction heating furnace) and a cooling water tank; wherein the annealing treatment temperature is 1040-1150℃, and the time is 1-35 min;

[0061] The winding treatment is that the steel pipe subjected to the annealing treatment is wound by a winding device, and the winding speed is equal to the pipe reducing speed.

[0062] In the prior art, the insulation material density of the product adopting the drawing process is 2.3-2.5 g / cm 3 , the insulation material density of the product produced by the production process of the armored thermocouple cable of embodiment 2 is 2.6-2.8 g / cm 3 .

[0063] Embodiment 3

[0064] A production device of a cable, same as embodiment 1.

[0065] A production process of an armored continuous thermocouple cable using the device as described above, the whole process is a continuous processing process, that is, the assembling of the filling column, the wrapping of the steel strip, the processing of the steel strip into a steel pipe, the reducing treatment, the annealing treatment, and the winding treatment are different processes in the continuous processing process, wherein:

[0066] The positive and negative double filaments are divided into two or more sections along the length direction, and the packing column is assembled on each section from one end to the other end of the positive and negative double filaments; the diameter of the positive double filament is 2-10 mm, the length is 100-5000 m, and the material is KP, NP, JP or PT; the diameter of the negative double filament is 2-10 mm, the length is 100-5000 m, and the material is KN, NN, JN or PN; the length is 100-5000 m, and the material is one or a mixture of several of MgO, Al2O3, SiO, AlN and NB; the outer diameter of the packing column is 13.3-60 mm, the length is 40-250 mm, and the material is 304, 316, 316L, 310S, Incon600, Inconel601, Incoloy800 or ncoloy825;

[0067] The two petals are arranged around the positive and negative double filaments, and the two petals are connected by a groove provided on one of the petals and a protrusion provided on the other petal and matched with the groove, to form a complete packing column with two through holes (through hole I and through hole II) and a circular cross-sectional outer edge, the positive double filament is located in the through hole I, the diameter of the through hole I is 0.5-1.5 mm larger than that of the positive double filament, and the negative double filament is located in the through hole II, the diameter of the through hole II is 0.5-1.5 mm larger than that of the negative double filament;

[0068] When the steel belt is wrapped, the thickness of the steel belt is 0.5-5 mm, and the material is 316, 316L, 310S, 310H, Inconel600, Inconel601 or 3039;

[0069] The steel belt is processed into a steel pipe by using a pipe making device to shape, roll and longitudinally seam weld the steel belt;

[0070] The diameter of the steel pipe is reduced to 4-30 mm by rolling through a pipe reducing device, and the pipe reducing speed is 1-10 m / min; during the diameter reduction process, the packing column is extruded by the steel pipe to form powder, and the powder formed after the extrusion of the packing column fills the internal space of the steel pipe;

[0071] The annealing treatment is performed by passing the steel pipe subjected to the diameter reduction treatment through an annealing furnace (a tubular resistance type annealing furnace or a tubular high-frequency induction heating furnace) and a cooling water tank; the annealing treatment temperature is 1040-1150℃, and the time is 1-35 min;

[0072] The annealing treated steel pipe is wound by a winding device, and the winding speed is equal to the pipe reducing speed.

[0073] The product insulation material density is 2.3-2.5 g / cm 3 using the production process of the armored continuous thermocouple cable of Example 3, the product insulation material density is 2.6-2.8 g / cm 3 .

Claims

1. A cable manufacturing process, characterized in that, The intermediate conductor is divided into two or more sections along its length. Filler columns are assembled on each section of the intermediate conductor from one end to the other. After wrapping the surface of the filler columns with steel strip, the steel strip is processed into a steel pipe. Then, the pipe undergoes a diameter reduction process, an annealing process, and a winding process in sequence to obtain the cable. The whole process is a continuous process. The number of intermediate conductors is n, where n is a positive integer greater than or equal to 1. When n is a positive integer greater than 1, the intermediate conductors are parallel to each other. The assembled filling column refers to the arrangement of two or more petals around all the intermediate conductors during the continuous processing, and the combination into a complete filling column with n through holes and a circular outer edge of the cross-section, with the n intermediate conductors located in the n through holes respectively; The steel strip is processed into a steel pipe by sequentially shaping, rolling, and longitudinally welding the steel strip. During the necking process, the filling column is squeezed by the steel pipe to form powder, and the powder formed after the filling column is squeezed fills the internal space of the steel pipe. The final density of the cable's insulation material is 2.6–2.8 g / cm³. 3 .

2. The cable manufacturing process according to claim 1, characterized in that, The diameter of the intermediate conductor is 1~15mm and the length is 100~5000m.

3. The cable manufacturing process according to claim 1, characterized in that, The outer diameter of the filling column is 13.3~60mm and the length is 40~250mm. The diameter of the through hole is 0.5~1.5mm larger than the diameter of the corresponding intermediate conductor.

4. The cable manufacturing process according to claim 1, characterized in that, In the assembly, two adjacent valves are connected by a groove and a protrusion that mates with the groove.

5. The cable manufacturing process according to claim 1, characterized in that, The thickness of the steel strip is 0.5~5mm; the material of the steel strip is 316, 316L, 310S, 310H, Inconel600, Inconel601 or 3039.

6. The cable manufacturing process according to claim 1, characterized in that, The shrinking speed is 1~10m / min; the annealing temperature is 1040~1150℃, and the time is 1~35min; the winding speed is equal to the shrinking speed.

7. The cable manufacturing process according to claim 1, characterized in that, The cable is a heating cable, with one intermediate conductor, which is a heating wire; or, the cable is an armored thermocouple cable, with two intermediate conductors, one a positive thermocouple wire and the other a negative thermocouple wire; or, the cable is an armored continuous thermocouple cable, with two intermediate conductors, one a positive thermocouple wire and the other a negative thermocouple wire.

8. An apparatus employing the cable manufacturing process as described in any one of claims 1 to 7, characterized in that, The tube making machine (4), tube shrinking device (6), annealing device (7), and winding device (8) are arranged at intervals along the running direction of the intermediate conductor; the tube making machine (4) includes 10 to 15 sets of pressure rollers, and an argon arc welding device (5) is provided between the last two sets of pressure rollers along the running direction of the intermediate conductor.

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