NS type fire-resistant cable and its manufacturing system

Abstract

The present invention provides an NS type fire-resistant cable and a manufacturing system thereof. Compared with the prior art, the manufacturing system of the NS type fire-resistant cable of the present invention comprises an outer layer laying unit for sequentially laying and manufacturing the outer layer of the cable, a traction device for fixedly pulling the wire core to drive the wire core to sequentially pass through different outer layer laying units, a shaping module for shaping and rolling different laying layers of the wire core respectively, and a temperature control module for controlling the contact temperature between the shaping module and the cable, which is arranged on the shaping module. The shaping module of the present invention can perform precise shaping operations on each coating layer of the cable, thereby ensuring the quality of the cable and improving the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cable manufacturing systems, and in particular to an NS type fire-resistant cable and a manufacturing system thereof. Background Art

[0002] NS type fire resistant cable is a type of NS fire resistant cable and its production system are specially designed to maintain its function under extreme conditions (such as fire). The main feature of this cable is that it can continue to transmit power or data in high temperature environments, thereby ensuring the operation of critical systems in emergency situations.

[0003] This experimental team has been browsing and researching a large number of relevant records and materials on the relevant technologies of cables for a long time. At the same time, it relies on relevant resources and conducts a large number of relevant experiments. After a large number of searches, it is found that the existing prior arts such as CN108369841B, CN110164615B, CN111799029B, and CN113363000B disclosed in the prior arts, such as a fire-retardant and fire-resistant cable, a fire-retardant coating and an outer sheath layer manufacturing device disclosed in the prior art; the fire-retardant and fire-resistant cable includes: a plurality of insulating cores, a cabling tape layer wrapped outside the insulating cores, a flame-retardant filler placed in the cabling tape layer and filled between the insulating cores, a fire-retardant coating coated on the outside of the cabling tape layer, and an outer sheath layer coated outside the fire-retardant coating. The fire-retardant coating and outer sheath layer manufacturing device includes: a controller, an electric take-up frame arranged in sequence front and back, a double-wheel traction machine, an air cooler, an outer sheath layer coating device, a heating and drying device, a fire-retardant coating dipping device and an electric pay-off frame.

[0004] The present invention is made in order to solve the common problems in the art such as intelligent monitoring and low processing adjustment efficiency in the cable production and processing process. Summary of the invention

[0005] The purpose of the present invention is to propose an NS type fire-resistant cable and a manufacturing system thereof in view of the deficiencies existing in the current art.

[0006] In order to overcome the shortcomings of the prior art, the present invention adopts the following technical solutions:

[0007] An NS type fire-resistant cable and a manufacturing system thereof, the NS type fire-resistant cable comprises a wire core and a plurality of laying layers sequentially laid on the outside of the wire core,

[0008] The core is obtained by twisting a plurality of copper conductors together, and the plurality of laying layers are, from the inside to the outside of the cable, an insulating layer, an isolation layer, an oxygen isolation layer, a pressure-resistant layer, a fireproof layer, and an outer sheath.

[0009] The insulating layer is made of cross-linked polyethylene, the isolation layer is obtained by winding and weaving a plurality of mica tapes, the oxygen barrier layer is a rubber layer made of butadiene rubber with uniformly distributed pores, the pressure-resistant layer is obtained by winding and weaving a plurality of steel tapes, the fireproof layer includes at least glass fiber and ceramic material, and the outer sheath is made of polyvinyl chloride, chlorinated polyethylene and / or cross-linked polyethylene.

[0010] The manufacturing system of the NS type fire-resistant cable includes an outer layer laying unit which is sequentially laid on the outside of the cable, a traction device which performs fixed traction on the wire core to drive the wire core to pass through different outer layer laying units sequentially, a shaping module which shapes and rolls different laying layers of the wire core respectively, and a temperature control module which is arranged on the shaping module and is used to control the contact temperature between the shaping module and the cable.

[0011] Furthermore, the outer layer laying unit includes at least three winding machines and at least four coating machines. The at least three winding machines are used to weave mica tape, steel tape and glass fiber outside the battery core respectively. The at least four coating machines respectively store the raw materials for making the insulating layer, oxygen barrier layer and outer sheath, as well as ceramic materials. The mica tape, steel tape and glass fiber are collectively referred to as raw material tapes. The fireproof layer is realized by at least one winding machine and at least one coating machine.

[0012] Furthermore, the shaping module includes a shaping unit for shaping each coating layer respectively, and each shaping unit includes at least three working rings, a fixing mechanism for fixing the three working rings vertically and coaxially, and a driving mechanism for driving the working rings to rotate the axis.

[0013] Furthermore, the fixing mechanism includes a box body which is horizontally arranged and has a cavity inside, a connecting port which is arranged on the bottom wall of the box body and connected to the cavity, a fixing ring which is coaxially sleeved on the outer ring wall of the three working rings respectively, a plurality of limiting mechanisms for limiting at least part of each fixing ring to be movable in the cavity of the box body, and a tooth pattern arranged on the outer ring wall of the fixing ring.

[0014] Furthermore, the driving mechanism includes at least three driving gears disposed in the cavity and respectively meshing with the teeth of different fixing rings, and at least three reduction motors for driving the driving gears to rotate the shaft.

[0015] Furthermore, each of the limiting mechanisms includes arc grooves symmetrically arranged on the ring walls on both sides of the fixing ring, at least two fixing blocks fixed to the cavity, and at least two extension rods respectively fixed to the two fixing blocks.

[0016] Among them, the arc groove is coaxially arranged with the fixing ring, the top area of ​​the fixing ring passes through the connecting port in sequence to extend into the cavity of the box body, each fixing ring is provided with two arc grooves, and the arc grooves are symmetrically arranged on the side ring wall of the fixing ring, one end of the two extension rods in the same limiting mechanism are respectively fixed on different fixing blocks and the other ends of the two extension rods are respectively extended horizontally into different arc grooves of the same fixing ring.

[0017] Furthermore, the operating ring includes a closed ring tube with a circular ring structure and a cavity channel inside, a cavity opening which is sequentially arranged on the inner ring wall of the closed ring tube and connected to the cavity channel, a miniature telescopic drive rod with one end fixed on the cavity wall of the cavity channel and the other end performing linear telescopic operation toward the cavity opening, and a rotating shaft connected to the other end of the miniature telescopic drive rod through a mounting seat.

[0018] Furthermore, the cable between two outer layer laying units which respectively coat different laying layers is regarded as a cable segment, one shaping unit is used to shape the same cable segment, and different shaping units are used to shape different cable segments.

[0019] The beneficial effects achieved by the present invention are:

[0020] 1. The NS type fire-resistant cable and its manufacturing system of the present invention adopt multiple layers of advanced materials and structural design, such as cross-linked polyethylene insulation layer, mica tape isolation layer, oxygen barrier layer made of butadiene rubber, compression layer woven by steel tape, and fireproof layer containing glass fiber and ceramic material, to ensure the high fire resistance, excellent mechanical protection and enhanced electrical performance of the cable, so that the NS type fire-resistant cable can work stably in a variety of harsh environments.

[0021] 2. The shaping module of the present invention can accurately shape each coating layer of the cable, ensuring the quality of the cable while improving production efficiency. The modular design and automated operation further enhance the production flexibility and system reliability, simplify the maintenance process, and improve the safety of the entire production process by reducing the need for operators to directly contact mechanical parts.

[0022] 3. The temperature control module of the present invention improves the ease of operation and adaptability by realizing accurate and real-time temperature monitoring and adjustment, reduces the maintenance time and cost of the equipment, and enhances the safety of the production process. Through detailed data recording and tracking, the ability to quickly respond to production changes ensures the continuity of the processing process, provides an important competitive advantage for cable manufacturing, and ensures the consistency of product quality and the high efficiency of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0024] Figure 1 It is a modular schematic diagram of the manufacturing system of the NS type fire-resistant cable of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the shaping unit of the present invention.

[0026] Figure 3 It is a schematic structural diagram of the fixing ring of the present invention.

[0027] Figure 4 It is a schematic structural diagram of the working ring of the present invention.

[0028] Explanation of the accompanying numbers: 1-cavity; 2-box body; 3-fixed block; 4-operating ring; 5-tooth pattern; 6-connecting port; 7-fixed ring; 8-extension rod; 9-driving gear; 10-reduction motor; 11-arc groove; 12-closed ring tube; 13-micro telescopic driving rod; 14-rotating shaft; 15-cavity channel. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail in combination with its embodiments below; it should be pointed out that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present case. For those skilled in the art, after reviewing the following detailed description, other systems, methods and / or features of this embodiment will become apparent. And the terms describing the positional relationship in the accompanying drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0030] Embodiment 1: Combining with Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 This embodiment constructs an NS type fire-resistant cable and a manufacturing system thereof. The NS type fire-resistant cable includes a wire core and a plurality of laying layers sequentially laid on the outside of the wire core.

[0031] The core is obtained by twisting a plurality of copper conductors together, and the plurality of laying layers are, from the inside to the outside of the cable, an insulating layer, an isolation layer, an oxygen isolation layer, a pressure-resistant layer, a fireproof layer, and an outer sheath.

[0032] The insulating layer is made of cross-linked polyethylene, the isolation layer is obtained by winding and weaving a plurality of mica tapes, the oxygen barrier layer is a rubber layer made of butadiene rubber with uniformly distributed pores, the pressure-resistant layer is obtained by winding and weaving a plurality of steel tapes, the fireproof layer includes at least glass fiber and ceramic material, and the outer sheath is made of polyvinyl chloride, chlorinated polyethylene and / or cross-linked polyethylene.

[0033] The manufacturing system of the NS type fire-resistant cable comprises an outer layer laying unit for sequentially laying and manufacturing the outer layers of the cable, a traction device for fixing and pulling the wire core to drive the wire core to pass through different outer layer laying units in sequence, a shaping module for shaping and rolling different laying layers of the wire core respectively, and a temperature control module arranged on the shaping module for controlling the contact temperature between the shaping module and the cable.

[0034] The outer layer laying unit includes at least three winding machines and at least four coating machines.

[0035] The at least three winding machines are used to weave mica tape, steel tape and glass fiber outside the battery core respectively. The at least four coating machines store the raw materials for the insulation layer, oxygen barrier layer and outer sheath and ceramic materials respectively. The mica tape, steel tape and glass fiber are collectively referred to as raw material tapes. The fireproof layer is realized by at least one winding machine and at least one coating machine.

[0036] The braiding machine weaves different raw material strips on the outside of the battery core, and the coating machine melts and extrudes different raw materials to achieve the production of different laying layers of the cable.

[0037] The NS type fire-resistant cable and its manufacturing system of the present invention ensure the high fire resistance, excellent mechanical protection and enhanced electrical performance of the cable by adopting multiple layers of advanced materials and structural design, such as a cross-linked polyethylene insulation layer, a mica tape isolation layer, an oxygen barrier layer made of butadiene rubber, a steel belt woven pressure-resistant layer, and a fireproof layer containing glass fiber and ceramic materials, so that the NS type fire-resistant cable can work stably in a variety of harsh environments.

[0038] Embodiment 2: Combining with Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 In addition to the contents of the above embodiments, the shaping module includes shaping units for shaping each coating layer respectively, each shaping unit includes at least three working rings, a fixing mechanism for fixing the three working rings vertically and coaxially, and a driving mechanism for driving the working rings to rotate the axis,

[0039] The fixing mechanism comprises a box body which is arranged horizontally and has a cavity inside, a communication port which is arranged on the bottom wall of the box body and communicates with the cavity, a fixing ring which is coaxially sleeved on the outer ring wall of the three working rings, a plurality of limiting mechanisms for limiting at least a part of each fixing ring to be movable in the cavity of the box body, and a tooth pattern arranged on the outer ring wall of the fixing ring.

[0040] The driving mechanism includes at least three driving gears disposed in the cavity and respectively meshing with the teeth of different fixing rings, and at least three reduction motors for driving the driving gears to rotate the shaft.

[0041] Each of the limiting mechanisms comprises arc grooves symmetrically arranged on the ring walls on both sides of the fixing ring, at least two fixing blocks fixed to the cavity, and at least two extension rods respectively fixed to the two fixing blocks, wherein the arc groove is coaxially arranged with the fixing ring, the top area of ​​the fixing ring sequentially passes through the connecting port to extend into the cavity of the box body, each fixing ring is provided with two arc grooves, and the arc grooves are symmetrically arranged on the side ring walls of the fixing ring, one end of the two extension rods in the same limiting mechanism is respectively fixed to different fixing blocks and the other ends of the two extension rods are respectively extended horizontally into different arc grooves of the same fixing ring,

[0042] The fixing ring can be movably fixed, and the fixing ring can rotate freely on its axis. At the same time, the closed arc grooves on both sides of the fixing ring can slide along the extension rod to ensure that the fixing ring rotates stably without leaving the box body.

[0043] The working ring comprises a closed ring tube with a circular ring structure and a cavity channel inside, a cavity opening arranged on the inner ring wall of the closed ring tube and connected to the cavity channel, a micro telescopic driving rod with one end fixed on the cavity wall of the cavity channel and the other end performing linear telescopic operation toward the cavity opening, and a rotating shaft connected to the other end of the micro telescopic driving rod through a mounting seat.

[0044] The rotating shafts can be axially rotated and limited on the mounting seats respectively, and the micro-telescopic driving rod can drive the rotating shafts to pass through the cavity openings in sequence. The cavity channel is a closed annular structure, and the cross section of the cavity channel is a circular surface coaxially arranged with the closed annular tube.

[0045] The cable between two outer layer laying units that respectively coat different laying layers is a cable segment. One shaping unit is used to shape the same cable segment, and different shaping units are used to shape different cable segments.

[0046] The corresponding micro-telescopic driving rods of the shaping units for each laying layer have different operating lengths, thereby realizing adaptive shaping operations for laying layers of different thicknesses.

[0047] The shaping module of the present invention can accurately shape each coating layer of the cable, ensuring the quality of the cable while improving production efficiency. The modular design and automated operation further enhance production flexibility and system reliability, simplify the maintenance process, and improve the safety of the entire production process by reducing the need for operators to directly contact mechanical parts.

[0048] Embodiment 3: Combining with Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 In addition to the contents of the above embodiments, the temperature control module includes a plurality of heating plates sequentially laid in the cavity channel of the closed loop tube, the temperature monitoring module includes a plurality of infrared thermal imagers for respectively monitoring the temperature of each cable segment obtained by the laying unit, a temperature parameter acquisition unit for respectively analyzing and processing each infrared thermal imager to obtain the operating temperature of each temperature device in the three operating rings in each shaping unit, and a controller for further adjusting and controlling the heating and / or cooling intensity of each temperature device according to the analysis and processing results of the temperature parameter acquisition unit,

[0049] Take the operating temperature calculation and analysis steps of each temperature controller in the shaping unit corresponding to one of the cable ends as an example:

[0050] S101: Use an infrared thermal imager to capture the temperature distribution data of the same cable segment in real time and at a preset time interval Δ t The surface temperature of the cable segment is recorded at the measuring point.

[0051] S102: Calculate the current average surface temperature of the cable segment T avg:

[0052] ;

[0053] in, N is the total number of measurement points on the surface of the current cable segment, T i It is i The temperature of the measuring point,

[0054] S103: Calculate temperature deviation e:

[0055] e= T target− T avg,

[0056] in, T target is the target processing temperature of the current cable segment,

[0057] S104: Calculate the continuous temperature deviation EA:

[0058] ,

[0059] e i It is in i The temperature deviation corresponding to each measurement point is

[0060] Δ t is the duration of the preset time interval,

[0061] S105: Generate the temperature change rate ER of the cable segment:

[0062] ,

[0063] Among them, e N is the temperature deviation of the current measurement point, e N-1 Yes N The temperature deviation from the last measurement,

[0064] S106: Generate temperature parameter Ref of the cable segment:

[0065] ;

[0066] Among them, K p is the proportional correlation coefficient, K i is the integral correlation coefficient, K d is the correlation coefficient of the rate of change, c1 is K p Priority related parameters, c2 is K i Priority related parameters, c3 is K d Priority related parameters,

[0067] S107: Obtain the heating temperatures of the heaters in the three working loops of the same shaping unit respectively, and the working loops through which the laying layer passes in sequence are represented as the first working loop, the second working loop, and the third working loop in sequence, and the heating temperature of the heater in the first working loop is represented as Tem1, the heating temperature of the heater in the second working loop is represented as Tem2, and the heating temperature of the heater in the third working loop is represented as Tem3, and the heating temperatures of each working loop of the same inner heater are respectively obtained:

[0068] Tem1=tep1+(Ref-AC1)×α,

[0069] Tem2=tep2+(Ref-AC2)×β,

[0070] Tem3=tep3+(Ref-AC3)×γ,

[0071] Wherein, tep1≥tep2≥tep3, AC1 is the first temperature reference value, AC2 is the second temperature reference value, AC3 is the third temperature reference value,

[0072] tep1 is the first preset heating temperature, tep2 is the second preset heating temperature, tep3 is the third preset heating temperature,

[0073] α is the first temperature correction coefficient, β is the second temperature adjustment coefficient, γ is the third temperature adjustment coefficient,

[0074] The values ​​of Ttarget, AC1, AC2, AC3, tep1, tep2, and tep3 of the shaping units for shaping different cable segments are different and are pre-stored and recorded in the production system, and the corresponding target processing temperatures, AC1, AC2, AC3, tep1, tep2, tep3, and K p , K i , K d , c1, c2, c3, α, β, and γ are obtained by technicians in this field based on a large number of repeated experimental trainings, and will not be repeated here.

[0075] The temperature parameter acquisition unit acquires the heating temperature of the three working rings in the shaping unit for shaping different cable segments based on s101-s107, and the controller adjusts the working temperature of each working ring of each shaping unit, thereby realizing the detailed management of the entire cable segment processing process.

[0076] The temperature control module of the present invention improves the ease of operation and adaptability by realizing accurate and real-time temperature monitoring and adjustment, reduces the maintenance time and cost of equipment, and enhances the safety of the production process. The ability to quickly respond to production changes through detailed data recording and tracking ensures the continuity of the processing process, provides an important competitive advantage for cable manufacturing, and ensures the consistency of product quality and the high efficiency of the production process.

[0077] Although the present invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the present invention. That is, the methods, systems and devices discussed above are examples. Various configurations may appropriately omit, replace or add various processes or components. For example, in alternative configurations, the method may be performed in an order different from that described, and / or various components may be added, omitted and / or combined. Moreover, the features described with respect to certain configurations may be combined in various other configurations, such as different aspects and elements of the configuration may be combined in a similar manner. In addition, as technology develops, the elements therein may be updated, i.e., many elements are examples and do not limit the scope of the present disclosure or claims. And it should be understood that after reading the contents of the record of the present invention, the technician may make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

Claims

1. A system for manufacturing NS type fire-resistant cable, characterized in that: NS type fire-resistant cable includes a core and several layers of laying layers sequentially laid on the outside of the core. The wire core is obtained by twisting a plurality of copper conductors together, and the plurality of laying layers are, from the inside to the outside of the cable, an insulating layer, a separation layer, an oxygen isolation layer, a pressure-resistant layer, a fireproof layer, and an outer sheath. The insulating layer is made of cross-linked polyethylene, the isolation layer is obtained by winding and weaving a plurality of mica tapes, the oxygen barrier layer is a rubber layer made of butadiene rubber and having evenly distributed pores, the pressure-resistant layer is obtained by winding and weaving a plurality of steel tapes, the fireproof layer includes at least glass fiber and ceramic material, and the outer sheath is made of polyvinyl chloride, chlorinated polyethylene and / or cross-linked polyethylene. The manufacturing system of the NS type fire-resistant cable includes an outer layer laying unit for laying and manufacturing the outer layer of the cable, a traction device for fixedly pulling the wire core to drive the wire core to pass through different outer layer laying units in sequence, a shaping module for shaping and rolling different laying layers of the wire core respectively, and a temperature control module arranged on the shaping module for controlling the contact temperature between the shaping module and the cable; The outer layer laying unit includes at least three winding machines and at least four coating machines, wherein the at least three winding machines are used to weave mica tape, steel tape and glass fiber outside the wire core respectively, and the at least four coating machines are used to store the raw materials and ceramic materials for the insulation layer, oxygen barrier layer and outer sheath respectively, wherein the mica tape, steel tape and glass fiber are collectively referred to as raw material tapes, and the fireproof layer is realized by at least one winding machine and at least one coating machine; The shaping module comprises shaping units for shaping each coating layer respectively, and each shaping unit comprises at least three working rings, a fixing mechanism for fixing the three working rings vertically and coaxially, and a driving mechanism for driving the working rings to rotate the axis; The fixing mechanism comprises a box body which is arranged horizontally and has a cavity inside, a communication port which is arranged on the bottom wall of the box body and communicates with the cavity, a fixing ring which is coaxially sleeved on the outer ring wall of the three working rings, a plurality of limiting mechanisms for limiting at least a part of each fixing ring to be movable in the cavity of the box body, and a tooth pattern arranged on the outer ring wall of the fixing ring; The driving mechanism includes at least three driving gears disposed in the cavity and respectively meshing with the teeth of different fixing rings, and at least three reduction motors for driving the driving gears to rotate the shaft; Each of the limiting mechanisms comprises arc grooves symmetrically arranged on the ring walls on both sides of the fixing ring, at least two fixing blocks fixed to the cavity, and at least two extension rods respectively fixed to the two fixing blocks, wherein the arc groove is coaxially arranged with the fixing ring, the top area of ​​the fixing ring sequentially passes through the connecting port to extend into the cavity of the box body, each fixing ring is provided with two arc grooves, and the arc grooves are symmetrically arranged on the side ring walls of the fixing ring, one end of the two extension rods in the same limiting mechanism is respectively fixed to different fixing blocks and the other ends of the two extension rods are respectively extended horizontally into different arc grooves of the same fixing ring; The operating ring includes a closed loop tube with a circular ring structure and a cavity channel inside, cavity openings arranged in sequence on the inner ring wall of the closed loop tube and connected to the cavity channel, a micro-telescopic driving rod with one end fixed on the cavity wall of the cavity channel and the other end performing linear telescopic operations toward the cavity opening, and a rotating shaft connected to the other end of the micro-telescopic driving rod through a mounting seat; the cable between two outer layer laying units that respectively coat different laying layers is a cable segment, and different shaping units are used to perform shaping operations on different cable segments.

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