A manufacturing system and method for low-smoke halogen-free flame-retardant cable

Abstract

The present invention relates to the technical field of cable manufacturing. The present invention provides a manufacturing system for a low-smoke halogen-free flame-retardant cable, comprising a raw material processing module, a multi-layer co-extrusion module, a clamping module, a collection module, a quality assessment module, an adjustment module and a cooling module. The raw material processing module heats and stirs an insulating raw material and a flame-retardant raw material respectively, and supplies the heated and stirred insulating raw material and the flame-retardant raw material to the multi-layer co-extrusion module. The multi-layer co-extrusion module sequentially extrude the insulating raw material and the flame-retardant raw material and wraps them around the outer periphery of a conductor to form an insulating layer and a flame-retardant layer of a double-layer structure. The clamping module clamps and fastens the insulating layer and the flame-retardant layer of the formed double-layer structure. The cooling module cools the clamped and fastened double-layer structure. The quality assessment module evaluates the insulating layer and the flame-retardant layer of the cable according to the state data collected by the collection module to form an evaluation result. The adjustment module triggers adjustment of extrusion parameters of the multi-layer co-extrusion module according to the evaluation result.

Description

Technical Field

[0001] The present invention relates to the technical field of cable manufacturing, and in particular to a manufacturing system and a manufacturing method for a low-smoke halogen-free flame-retardant cable. Background Art

[0002] Traditional cables will produce a lot of smoke and toxic gases when they catch fire, posing a serious threat to the environment and human health. Low-smoke halogen-free flame-retardant cables produce less smoke and halogen-free acidic gases when they burn by using special materials and designs.

[0003] For example, the Chinese patent CN103000277B discloses a low-smoke, halogen-free, flame-retardant, and highly elastic cable. Although it provides improvements to the cable insulation layer, it lacks precise monitoring of the cable preparation process, resulting in problems such as uneven material mixing and low extrusion molding efficiency during the cable preparation process.

[0004] At the same time, in the prior art, there are also problems that the insulation layer and the flame retardant layer of the double-layer structure are prone to interface delamination and unstable extrusion molding during extrusion molding;

[0005] In addition, there are the following defects in the prior art:

[0006] 1. In traditional double-layer cables, the adhesion between the two layers is usually ensured only by the material adhesion properties and the control of co-extrusion process parameters. The adhesion between the insulation layer and the flame retardant layer is not strong, which can easily lead to defects such as delamination and falling off.

[0007] 2. The uneven mixing of flame retardant and polymer matrix results in unstable distribution of flame retardant, which causes the existing low-smoke halogen-free flame retardant cable to fail to meet the flame retardant performance standards and cannot meet the high flame retardant standards.

[0008] The present invention is made to solve the common problems in this field, such as weak material pretreatment ability, poor extrusion quality, inability to monitor quality, lack of adjustment ability, poor adhesion between the insulation layer and the flame retardant layer, insufficient flame retardant ability, low intelligence, unstable cooling process, etc. Summary of the invention

[0009] The purpose of the present invention is to propose a manufacturing system and a manufacturing method for a low-smoke halogen-free flame-retardant cable in view of the existing deficiencies.

[0010] In order to overcome the shortcomings of the prior art, the present invention adopts the following technical solutions:

[0011] A low-smoke halogen-free flame-retardant cable manufacturing system, the low-smoke halogen-free flame-retardant cable manufacturing system comprising a server, a conductor, and an insulating material and a flame-retardant material, the low-smoke halogen-free flame-retardant cable manufacturing system further comprising a raw material processing module, a multi-layer co-extrusion module, a clamping module, a traction module, a collection module, a quality assessment module, an adjustment module and a cooling module, the server is respectively connected to the raw material processing module, the multi-layer co-extrusion module, the clamping module, the traction module, the collection module, the quality assessment module, the adjustment module and the cooling module;

[0012] The raw material processing module heats and stirs the insulating raw material and the flame retardant raw material respectively, and supplies the heated and stirred insulating raw material and flame retardant raw material to the multi-layer co-extrusion module, the multi-layer co-extrusion module extrude the insulating raw material and the flame retardant raw material in sequence and wrap them around the conductor to form a double-layer structure with an insulating layer and a flame retardant layer, the clamping module clamps and tightens the cable with the double-layer structure, the cooling module cools the clamped and tightened double-layer structure, the traction module pulls the conductor and the conductor wrapped with the insulating layer and the flame retardant layer of the double-layer structure, the acquisition module acquires status data of the insulating layer and the flame retardant layer of the double-layer structure, the quality assessment module evaluates the insulating layer and the flame retardant layer of the cable according to the status data acquired by the acquisition module to form an assessment result, and the adjustment module triggers the adjustment of the extrusion parameters of the multi-layer co-extrusion module according to the assessment result;

[0013] The clamping module is arranged on the extrusion route of the insulating layer and the flame retardant layer of the double-layer structure, and clamps the extruded insulating layer and the flame retardant layer.

[0014] Optionally, the raw material processing module includes a raw material processing unit, a heating unit and a supply unit, the raw material processing unit mixes the raw materials, the heating unit heats the raw materials to make the raw materials molten, and the supply unit supplies the molten raw materials to the multi-layer co-extrusion module;

[0015] The raw material processing unit comprises a stirring chamber, a stirring rod, a stirring driving mechanism and a supporting seat, one end of the stirring rod is drivingly connected to the stirring driving mechanism to form a mixing portion, the other end of the stirring rod extends toward a side away from the mixing portion, and the supporting seat is arranged in the stirring chamber to support the mixing portion;

[0016] Wherein, the heating unit is arranged in a spiral shape along the extension direction of the inner wall of the stirring chamber.

[0017] Optionally, the multi-layer co-extrusion module includes an extrusion head, an insulation extrusion unit and a flame retardant extrusion unit, the insulation extrusion unit and the flame retardant extrusion unit are arranged on the extrusion head, the insulation extrusion unit extrude the insulation raw material and wrap it around the periphery of the conductor to form the insulation layer, and the flame retardant extrusion unit extrude the flame retardant raw material and wrap it around the periphery of the insulation layer to form the flame retardant layer;

[0018] Wherein, the insulating extrusion unit comprises an insulating extrusion chamber, an extrusion screw, an extrusion drive mechanism, an extrusion die, and a die placement chamber, one end of the extrusion screw is drivingly connected to the extrusion drive mechanism to form an extrusion portion, the extrusion portion is arranged on the inner wall of the insulating extrusion chamber so that the other end of the extrusion screw extends into the insulating extrusion chamber, the die placement chamber is arranged at the extrusion port of the insulating extrusion chamber, and the extrusion die can be detachably loaded in the die placement chamber;

[0019] The extrusion die modifies the insulating layer formed by extrusion to limit the thickness of the insulating layer.

[0020] Optionally, the clamping module includes a clamping unit and a stretching unit, the clamping unit clamps and fastens the insulating layer and the flame-retardant layer of the double-layer structure, and the stretching unit adjusts the position of the clamping unit;

[0021] The clamping unit comprises an upper clamping plate, a lower clamping plate, and contact pads arranged on the upper clamping plate and the lower clamping plate, wherein the upper clamping plate and the lower clamping plate are symmetrically arranged on the peripheral side of the conductor pulling route, and clamp the cable wrapped with the insulating layer and the flame retardant layer from the upper and lower sides under the extension operation of the extension unit;

[0022] Wherein, the extending unit is detachably connected to the upper clamping plate and the lower clamping plate respectively to adjust the positions of the upper clamping plate and the lower clamping plate.

[0023] Optionally, the collection module includes a collection unit and a steering unit, the collection unit collects the insulation layer and the flame retardant layer of the formed double-layer structure cable, and the steering unit adjusts the collection angle of the collection unit so that the collection unit can collect the performance data of the surrounding sides of the insulation layer and the flame retardant layer;

[0024] The acquisition unit includes an acquisition seat, a laser diameter gauge, an ultrasonic thickness gauge, an X-ray / γ-ray density meter and a data storage device. The acquisition seat is used to place the laser diameter gauge, the ultrasonic thickness gauge, the visual acquisition probe, and the X-ray / γ-ray density meter. The laser diameter gauge measures the diameter of the cable wrapped with an insulating layer and a flame retardant layer. The ultrasonic thickness gauge collects the thickness of the insulating layer and the flame retardant layer. The X-ray / γ-ray density meter collects density data of the insulating layer and the flame retardant layer. The data storage device stores the diameter data measured by the laser diameter gauge, the thickness data measured by the ultrasonic thickness gauge, and the density data collected by the X-ray / γ-ray density meter.

[0025] Optionally, the quality assessment module obtains the state data collected by the collection module, and calculates the state index Performance of the insulating layer and the flame retardant layer of the double-layer structure according to the following formula:

[0026] ;

[0027] Wherein, D is the average diameter of the insulating layer and the flame retardant layer of the double-layer structure formed, D0 is the target diameter of the insulating layer and the flame retardant layer of the double-layer structure set by the system, R is the roundness of the insulating layer and the flame retardant layer of the double-layer structure formed, T is the comprehensive thickness of the insulating layer and the flame retardant layer of the double-layer structure formed, T0 is the target thickness of the insulating layer and the flame retardant layer of the double-layer structure formed, ρ is the density of the insulating layer and the flame retardant layer of the double-layer structure formed, and ρ0 is the target density of the insulating layer and the flame retardant layer of the double-layer structure formed;

[0028] If the state index Performance falls within the qualified monitoring threshold range set by the system, it means that the extrusion parameters of the multi-layer co-extrusion module meet the requirements set by the system and no adjustment is required.

[0029] In addition, the present invention also provides a method for manufacturing a low-smoke halogen-free flame-retardant cable, and the method for manufacturing a low-smoke halogen-free flame-retardant cable comprises the following steps:

[0030] S1, processing the insulating raw material and the flame retardant raw material through the raw material processing module, and supplying the heated and stirred insulating raw material and the flame retardant raw material to the multi-layer co-extrusion module;

[0031] S2, extruding the insulating raw material and the flame retardant raw material in sequence through a multi-layer co-extrusion module and wrapping the outer periphery of the conductor to form a double-layer structure having an insulating layer and a flame retardant layer;

[0032] S3, clamping and fastening the formed double-layer cable by the clamping module so that the insulating layer and the flame retardant layer are in contact with each other;

[0033] S4, cooling the clamped and fastened double-layer structure by means of the cooling module;

[0034] S5, the acquisition module acquires status data of the insulating layer and the flame retardant layer of the double-layer structure;

[0035] Wherein, the state data includes the diameter, roundness, thickness and density data of the insulating layer and the flame retardant layer of the formed double-layer structure;

[0036] S6, the quality assessment module assesses the insulation layer and the flame retardant layer of the cable according to the status data collected by the acquisition module to determine the status index Performance of the insulation layer and the flame retardant layer of the double-layer structure formed;

[0037] S7, the adjustment module triggers adjustment of the extrusion parameters of the multi-layer co-extrusion module according to the evaluation result;

[0038] If the state index Performance of the insulating layer and the flame retardant layer of the formed double-layer structure exceeds the qualified monitoring threshold range set by the system, the adjustment module is triggered to adjust the extrusion parameters of the multi-layer co-extrusion module;

[0039] Optionally, the method for manufacturing the low-smoke halogen-free flame-retardant cable also includes: in step S1, the insulating raw material and the flame-retardant raw material are processed by independent raw material processing modules, and are independently supplied to corresponding extrusion channels, and are extruded in sequence to form an insulating layer and a flame-retardant layer.

[0040] Optionally, the method for manufacturing the low-smoke halogen-free flame-retardant cable also includes: during the extrusion process, a traction module is symmetrically arranged on the conductor, and the conductor wrapped with a double-layer structure insulation layer and a flame retardant layer is pulled, so that the multi-layer co-extrusion module extrudes the insulating material and the flame retardant material along the length direction of the conductor and wraps them around the outer periphery of the conductor.

[0041] Optionally, the method for manufacturing the low-smoke halogen-free flame-retardant cable further includes: in step S5, when the acquisition module acquires the performance data of the insulating layer and the flame-retardant layer of the formed double-layer structure, it acquires the performance data of at least two angles around the axis of the insulating layer and the flame-retardant layer.

[0042] The beneficial effects achieved by the present invention are:

[0043] 1. Through the cooperation of the acquisition module and the quality assessment module, the cable production quality can be monitored, ensuring that the entire system has the advantages of accurate quality monitoring, strong quality assessment capability and strong adaptive adjustment capability;

[0044] 2. Through the cooperation between the clamping module and the multi-layer co-extrusion module, the insulation layer and the flame retardant layer are more closely combined, ensuring that the preparation of the entire cable is more reliable and the protection effect is better, so that the entire manufacturing system has the advantages of high adhesion of the insulation layer and the flame retardant layer, high intelligence and reliable extrusion quality;

[0045] 3. Through the cooperation of multi-layer co-extrusion module and cooling module, the cooling effect of the flame retardant layer of the cable is improved, ensuring that the entire system has the advantages of high stability in the cooling process, high intelligence, and strong heat dissipation and cooling capabilities;

[0046] 4. Through the cooperation between the adjustment module and the quality assessment module, the quality of the insulation layer and the flame retardant layer can be assessed, and the monitoring capability of the entire production system for cable preparation can be improved, ensuring that the entire system has the advantages of strong automatic control capability, good quality assessment reliability, and high flame retardant capability;

[0047] 5. By adjusting the mutual cooperation between the module and the multi-layer co-extrusion module, the cable preparation process is made more refined, ensuring that the entire system has the advantages of high extrusion quality accuracy, accurate extrusion process monitoring, high reliability of quality assessment means and high intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] 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 the same parts.

[0049] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0050] Figure 2 It is a flow chart of the acquisition module and the quality assessment module of the present invention.

[0051] Figure 3 It is a schematic diagram of the overall structure of the production system of the present invention.

[0052] Figure 4 for Figure 3 A magnified schematic diagram of center A.

[0053] Figure 5 for Figure 3 A magnified schematic diagram of point B in the middle.

[0054] Figure 6 It is a front view schematic diagram of the clamping module of the present invention.

[0055] Figure 7 It is a schematic diagram of an application scenario in which the collection module of the present invention collects data from a conductor wrapped with an insulating layer and a flame retardant layer.

[0056] Figure 8 It is a partial structural schematic diagram of the steering seat and the steering positioning member of the present invention.

[0057] Fig. 9 for Figure 3 Schematic cross-sectional view at CC in the middle.

[0058] Fig.10 It is a schematic diagram of an application scenario of the upper pulling wheel and the lower pulling wheel of the present invention and a conductor wrapped with an insulating layer and a flame retardant layer.

[0059] Explanation of reference numerals: 1. conductor; 2. pulling module; 3. cooling port; 4. cooling chamber; 5. reflux port; 6. stand; 7. flame retardant layer; 8. extrusion screw; 9. insulation extrusion chamber; 10. extrusion drive mechanism; 11. stirring chamber; 12. stirring drive mechanism; 13. stirring rod; 14. electronic control valve; 15. supply chamber; 16. supply screw; 17. supply drive mechanism; 18. fixed seat; 19. clamping chamber; 20. extension rod; 21A , upper clamping plate; 21B, lower clamping plate; 22, water inlet; 23, circulation port; 24, water flow disturber; 25, cooling chamber; 26, water-proof sealing ring; 27, steering drive mechanism; 28, steering seat; 29, identification probe; 30, collection unit; 31, steering gear; 32, steering positioning piece; 33, upper traction wheel; 34, limiting airbag; 35, vertical plate; 36, α traction drive mechanism; 37, lower traction wheel; 38, β traction drive mechanism. DETAILED DESCRIPTION

[0060] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual sizes. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0061] Embodiment 1: According to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, this embodiment provides a system for manufacturing a low-smoke halogen-free flame-retardant cable, the system for manufacturing a low-smoke halogen-free flame-retardant cable comprises a server, a conductor 1, and an insulating material and a flame-retardant material, the system for manufacturing a low-smoke halogen-free flame-retardant cable further comprises a raw material processing module, a multi-layer co-extrusion module, a clamping module, a traction module, a collection module, a quality assessment module, an adjustment module and a cooling module, the server is respectively connected to the raw material processing module, the multi-layer co-extrusion module, the clamping module, the traction module, the collection module, the quality assessment module, the adjustment module and the cooling module, and the intermediate data and process data of the raw material processing module, the multi-layer co-extrusion module, the clamping module, the traction module, the collection module, the quality assessment module, the adjustment module and the cooling module are stored in the server for query or call;

[0062] The raw material processing module heats and stirs the insulating raw material and the flame retardant raw material respectively, and supplies the heated and stirred insulating raw material and flame retardant raw material to the multi-layer co-extrusion module, the multi-layer co-extrusion module extrude the insulating raw material and the flame retardant raw material in sequence and wrap them around the conductor 1 to form a double-layer structure with an insulating layer and a flame retardant layer 7, the clamping module clamps and tightens the cable with the double-layer structure, the cooling module cools the clamped and tightened double-layer structure, the traction module pulls the conductor 1 and the conductor 1 wrapped with the double-layer structure, the acquisition module collects status data of the insulating layer and the flame retardant layer 7, the quality assessment module evaluates the insulating layer and the flame retardant layer 7 of the cable according to the status data collected by the acquisition module to form an assessment result, and the adjustment module triggers the adjustment of the extrusion parameters of the multi-layer co-extrusion module according to the assessment result;

[0063] The clamping module is arranged on the extrusion route of the insulating layer and the flame retardant layer 7 of the double-layer structure, and clamps the extruded insulating layer and the flame retardant layer 7;

[0064] The low-smoke halogen-free flame-retardant cable manufacturing system also includes a central processing unit, which is respectively connected to the raw material processing module, the multi-layer co-extrusion module, the clamping module, the traction module, the acquisition module, the quality assessment module, the adjustment module and the cooling module, and is centrally controlled based on the central processing unit to control the raw material processing module, the multi-layer co-extrusion module, the clamping module, the traction module, the acquisition module, the quality assessment module, the adjustment module and the cooling module, and the control data is stored in the server, so as to improve the reliability and accuracy of the entire system for cable preparation / production, and ensure that the entire system has the ability to automatically operate and automatically perform quality assessment;

[0065] In addition, the insulating material and the flame retardant material need to be selected according to the actual situation. This is a technical means well known to those skilled in the art. Those skilled in the art can refer to relevant technical manuals to learn about the technology, so they will not be described one by one in this embodiment.

[0066] Meanwhile, the insulating materials include but are not limited to the following: polyethylene (PE), cross-linked polyethylene (XLPE), polyvinyl chloride (PVC), polypropylene (PP), ethylene propylene rubber (EPR), silicone rubber (SR), fluoroplastics (FEP, PTFE, PFA, ETFE);

[0067] The flame retardant raw materials include but are not limited to the following: aluminum hydroxide (ATH), magnesium hydroxide (MDH), phosphorus flame retardant, nitrogen flame retardant, halogen flame retardant, expanded graphite, silicone flame retardant;

[0068] Optionally, the raw material processing module includes a raw material processing unit, a heating unit and a supply unit, the raw material processing unit mixes the raw materials, the heating unit heats the raw materials to make the raw materials molten, and the supply unit supplies the molten raw materials to the multi-layer co-extrusion module;

[0069] In this embodiment, the insulating raw materials and the heat insulating materials are both provided with corresponding raw material processing units, heating units and supply units for processing, and are supplied to the corresponding multi-layer co-extrusion modules after processing;

[0070] Wherein, the raw material processing unit, heating unit and supply unit for processing the insulating raw material and the heat-insulating material have the same structure, and the difference is only in processing different materials;

[0071] The raw material processing unit includes a stirring chamber 11, a stirring rod 13, a stirring driving mechanism 12 and a support seat, one end of the stirring rod 13 is drivingly connected to the stirring driving mechanism 12 to form a mixing portion, and the other end of the stirring rod 13 extends toward a side away from the mixing portion, and the support seat is arranged in the stirring chamber 11 to support the mixing portion;

[0072] Wherein, the heating unit is arranged in a spiral shape along the extension direction of the inner wall of the stirring chamber 11;

[0073] The supply unit includes a supply chamber 15, a supply screw 16 and a supply drive mechanism 17. The supply chamber 15 is arranged between the stirring chamber 11 and the multi-layer co-extrusion module, and is configured to supply the raw materials (insulating raw materials and flame-retardant raw materials) in a stirred and molten state to the multi-layer co-extrusion module. The supply drive mechanism 17 is connected to one end of the supply screw 16 to form a supply part. The supply part is arranged on the supply chamber 15 so that the other end of the supply screw 16 extends into the supply chamber 15 and supplies the raw materials in the supply chamber 15 to the multi-layer co-extrusion module.

[0074] In addition, the raw material processing unit further includes an electronic control valve 14, which is disposed at the connection between the stirring chamber 11 and the supply chamber 15, and performs on-off control on the raw material in a molten state after stirring, so that the raw material in a molten state enters the supply chamber 15 from the stirring chamber 11;

[0075] At the same time, the stirring chamber 11 and the supply chamber 15 are provided with partitions for placing the heating unit;

[0076] The heating unit includes a heater and a current controller, the heater is electrically connected to the current controller, and the heater is spirally arranged in the interlayer of the stirring chamber 11 and the supply chamber 15, and heats the raw materials in the stirring chamber 11 and the supply chamber 15, so that the raw materials in the stirring chamber 11 and the supply chamber 15 are heated;

[0077] In this embodiment, the current controller controls the current of the heater, thereby controlling the heat generated by the heater, thereby achieving the purpose of accurately controlling the heat generated by the heater;

[0078] Optionally, the multi-layer co-extrusion module includes an extrusion head, an insulation extrusion unit and a flame retardant extrusion unit, the insulation extrusion unit and the flame retardant extrusion unit are arranged on the extrusion head, the insulation extrusion unit extrude the insulation raw material and wrap it around the periphery of the conductor 1 to form the insulation layer, and the flame retardant extrusion unit extrude the flame retardant raw material and wrap it around the periphery of the insulation layer to form the flame retardant layer 7;

[0079] The body of the extruder head is provided with a through hole, and the through hole is used for the conductor 1 to pass through; when the conductor 1 passes through, the multi-layer co-extrusion module sequentially extrude the insulating material and the flame retardant material and wrap them around the outer periphery of the conductor 1;

[0080] The insulating extrusion unit includes an insulating extrusion cavity 9, an extrusion screw 8, an extrusion drive mechanism 10, an extrusion die, and a die placement cavity. One end of the extrusion screw 8 is drivingly connected to the extrusion drive mechanism 10 to form an extrusion portion. The extrusion portion is arranged on the inner wall of the insulating extrusion cavity 9 so that the other end of the extrusion screw 8 extends into the insulating extrusion cavity 9. The die placement cavity is arranged at the extrusion port of the insulating extrusion cavity 9, and the extrusion die can be detachably loaded in the die placement cavity.

[0081] wherein the extrusion die modifies the insulating layer formed by extrusion to limit the thickness of the insulating layer;

[0082] The flame-retardant extrusion unit comprises a flame-retardant extrusion chamber, an extrusion screw, an extrusion drive mechanism, an extrusion die, and a die limiting chamber. One end of the extrusion screw is drivingly connected to the extrusion drive mechanism to form an extrusion portion. The extrusion portion is arranged on the inner wall of the flame-retardant extrusion chamber so that the other end of the extrusion screw extends into the flame-retardant extrusion chamber. The die limiting chamber is arranged at the extrusion port of the flame-retardant extrusion chamber. The extrusion die can be detachably loaded in the die limiting chamber.

[0083] Wherein, the extrusion die modifies the flame retardant layer 7 formed by extrusion to limit the thickness of the flame retardant layer 7;

[0084] In this embodiment, the insulating extrusion unit and the flame retardant extrusion unit are both arranged on the extrusion head body, and the two are arranged at intervals on both ends of the extrusion head body, and the insulating raw material and the flame retardant raw material are respectively extruded and wrapped around the outer periphery of the conductor 1;

[0085] In this embodiment, the raw material processing unit for the insulating raw material transfers the insulating raw material in a molten state to the insulating extrusion unit. Similarly, the raw material processing unit for the flame retardant raw material transfers the flame retardant raw material in a molten state to the flame retardant extrusion unit.

[0086] The multi-layer co-extrusion module further includes a cooling unit, which is disposed on the extrusion head body and performs a preliminary cooling operation on the insulating layer. After the preliminary cooling, the flame-retardant raw material is extruded and wrapped on the insulating layer through the flame-retardant extrusion unit;

[0087] The cooling unit comprises a cooling chamber 4, a cooling component and a cooling storage tank, wherein the cooling storage tank is used to store cooling water, the cooling component supplies the cooling water in the cooling storage tank to the insulating layer to cool the insulating layer, and the cooling chamber 4 is used to place the cooling component;

[0088] The cooling chamber 4 is connected to the through hole so that the cooling component can cool the insulation layer;

[0089] The cooling component includes a cooling pipe, a cooling port 3, a circulation pump, a reflux port 5 and a reflux pipe. The cooling port 3 and the reflux port 5 are both arranged on the cooling chamber 4 and communicated with the interior of the cooling chamber 4. One end of the cooling pipe is connected to the reflux port 5 of the circulation pump, and the cooling port 3 of the circulation pump is connected to the cooling storage tank, so that the cooling water is transmitted to the cooling chamber 4 through the cooling pipe. One end of the reflux pipe is connected to the cooling port 3, and the other end of the reflux pipe is connected to the cooling storage tank, so as to form a circulating waterway channel, thereby realizing the initial cooling of the insulation layer;

[0090] After the insulation layer is cooled by the cooling unit, the insulation layer forms a primary protective insulation layer outside the conductor 1, thereby improving the insulation capacity of the cable;

[0091] The cooling unit further comprises a water retaining seal ring, which is arranged at the junction of the passage hole and the cooling chamber 4 to seal the cooling water in the cooling chamber 4;

[0092] Among them, for the passage holes with different circumferences, suitable water-blocking sealing rings are selected, which is a technical means well known to those skilled in the art, and therefore will not be described in detail in this embodiment;

[0093] The clamping module is arranged at the extrusion outlet of the flame retardant extrusion unit, and clamps the insulating layer and the flame retardant layer 7;

[0094] Optionally, the clamping module includes a clamping unit and a stretching unit, the clamping unit clamps and fastens the insulating layer and the flame retardant layer 7 of the double-layer structure, and the stretching unit adjusts the position of the clamping unit;

[0095] The clamping unit includes an upper clamping plate 21A, a lower clamping plate 21B, and contact pads arranged on the upper clamping plate 21A and the lower clamping plate 21B. The upper clamping plate 21A and the lower clamping plate 21B are symmetrically arranged on the peripheral side of the conductor 1 pulling route, and under the extension operation of the extension unit, the conductor 1 wrapped with the insulating layer and the flame retardant layer 7 are clamped from the upper and lower sides;

[0096] The extending unit is detachably connected to the upper clamping plate 21A and the lower clamping plate 21B respectively to adjust the positions of the upper clamping plate 21A and the lower clamping plate 21B.

[0097] The upper clamping plate 21A and the lower clamping plate 21B are arranged at positions as follows: Figure 6 As shown, at the same time, the arc shape of the upper clamping plate 21A and the lower clamping plate 21B is adapted to the circumference of the currently produced cable;

[0098] For cables with different processing or different circumferences, it is necessary to select the corresponding upper clamping plate 21A and lower clamping plate 21B and load them at the execution end of the extension unit;

[0099] In this embodiment, the connection mode between the extension unit and the upper clamping plate 21A and the lower clamping plate 21B is set to be detachable;

[0100] The extension unit is detachably connected to the upper clamping plate 21A and the lower clamping plate 21B respectively, wherein the extension unit comprises an extension rod 20, an extension detection member and an extension driving mechanism, one end of the extension rod 20 is detachably connected to the upper clamping plate 21A and the lower clamping plate 21B, and the other end of the extension rod 20 is drivingly connected to the extension driving mechanism to form an extension portion, and the extension portion is arranged on both sides of the flame retardant layer 7, and the extension detection member detects the extension length of the extension rod 20, and feeds back the extension amount of the extension rod 20 to the central processing unit, so that the central processing unit can control the extension driving mechanism to drive the extension amount of the extension rod 20, so as to achieve the purpose of accurately controlling the clamping member;

[0101] After the flame retardant layer 7 is extruded, the extension unit adjusts the positions of the upper clamping plate 21A and the lower clamping plate 21B so that the upper clamping plate 21A and the lower clamping plate 21B can be close to the flame retardant layer 7, and triggers the upper clamping plate 21A and the lower clamping plate 21B to clamp and tighten the flame retardant layer 7, so that the flame retardant layer 7 and the insulating layer are more closely attached;

[0102] At the same time, since the insulation layer is cooled in advance, the insulation layer can maintain its own insulation performance, and under the clamping and fastening of the upper clamping plate 21A and the lower clamping plate 21B, the flame retardant layer 7 is ensured to be attached to the insulation layer, thereby improving the protective effect of the insulation layer and the flame retardant layer 7;

[0103] The specific process of clamping is as follows:

[0104] The extending rod 20 is driven by the extending driving mechanism to perform an extending operation, so that the upper clamping plate 21A and the lower clamping plate 21B are clamped from the upper and lower sides of the conductor wrapped with the insulating layer and the flame retardant layer 7, so that the insulating layer and the flame retardant layer 7 are tightly closed. After clamping, the extending driving mechanism immediately drives the extending rod 20 to retract, so that the upper clamping plate 21A and the lower clamping plate 21B are separated from the conductor wrapped with the insulating layer and the flame retardant layer 7, and under the traction of the traction module, the conductor 1 wrapped with the insulating layer and the flame retardant layer 7 is clamped at another position, and the above operation is repeated until the conductor 1 wrapped with the insulating layer and the flame retardant layer 7 is completely clamped and tightened;

[0105] Through the mutual cooperation between the clamping module and the multi-layer co-extrusion module, the insulation layer and the flame retardant layer 7 are more closely combined, ensuring that the preparation of the entire cable is more reliable and the protection effect is better, so that the entire manufacturing system has the advantages of high adhesion of the insulation layer and the flame retardant layer 7, high intelligence and reliable extrusion quality;

[0106] The cooling module includes a cooling chamber 25, a cooling pipe, a booster pump, a circulation pipe, a water tank and a circulation pump. The cooling chamber 25 is provided with a water inlet 22 and a circulation port 23. One end of the cooling pipe is connected to the water inlet 22 of the cooling chamber 25, and the other end of the cooling pipe is connected to the booster pump to form a booster part. The booster part is arranged on the water tank and connected to the water tank pipe. The water tank is used to store cooling water. One end of the circulation pipe is connected to the circulation port 23 of the cooling chamber 25, and the other end of the circulation end is connected to the circulation pump to form a circulation part. The circulation part is arranged on the water tank and connected to the water tank pipe.

[0107] Among them, Figure 5 As shown, the cooling chamber 25 is arranged on one side of the extrusion process of the flame retardant extrusion unit to cool the flame retardant layer 7 formed by extrusion;

[0108] The cooling module further includes a water flow disturber 24 and a disturbance driving mechanism, wherein the disturbance driving mechanism drives the swing direction of the water flow disturber 24, and the water flow disturber 24 disturbs the cooling water so that the water flow direction can be disturbed, so that the water flow can quickly take away the heat;

[0109] The water flow disturber 24 is drivingly connected to the disturbance driving mechanism to form a disturbance part, and the disturbance part is arranged in the cooling cavity 25;

[0110] The cooling module further includes a water-proof sealing ring 26, which is arranged at the contact position between the cooling cavity 25 and the conductor wrapped with the insulating layer and the flame-retardant layer 7 to block the cooling water;

[0111] The water-proof sealing ring 26 is adapted to the circumference of the conductor wrapped with the insulating layer and the flame-retardant layer 7;

[0112] Through the cooperation of the multi-layer co-extrusion module and the cooling module, the cooling effect of the flame retardant layer 7 of the cable is improved, ensuring that the entire system has the advantages of high stability in the cooling process, high intelligence, and strong heat dissipation and temperature reduction capabilities;

[0113] Optionally, the collection module includes a collection unit 30 and a steering unit, the collection unit 30 collects relevant data of the insulation layer and the flame retardant layer 7 of the formed double-layer structure cable, and the steering unit adjusts the collection angle of the collection unit 30 so that the collection unit 30 can collect performance data of the surrounding side of the insulation layer and the flame retardant layer 7;

[0114] The acquisition unit 30 includes an acquisition seat, a laser diameter gauge, an ultrasonic thickness gauge, an X-ray / γ-ray density meter and a data storage device. The acquisition seat is used to place the laser diameter gauge, the ultrasonic thickness gauge, the visual acquisition probe, and the X-ray / γ-ray density meter. The laser diameter gauge measures the diameter of the cable wrapped with the insulating layer and the flame retardant layer 7, the ultrasonic thickness gauge measures the thickness of the double-layer structure, the X-ray / γ-ray density meter collects density data of the double-layer structure, and the data storage device stores the diameter data measured by the laser diameter gauge, the thickness data measured by the ultrasonic thickness gauge, and the density data collected by the X-ray / γ-ray density meter.

[0115] The steering unit comprises a stand 6, a steering seat 28, a steering drive mechanism 27, an identification probe 29 and at least two steering positioning members 32. The stand 6 is used to support the steering seat 28, and a steering track is provided on the stand 6. The steering seat 28 is slidably connected to the steering track. A steering gear 31 is provided on the outer periphery of the steering seat 28. The steering gear 31 is drivingly connected to the steering drive mechanism 27 so that the steering seat 28 rotates along its own axis.

[0116] At least two steering positioning members 32 are arranged on the steering track and are distributed at equal intervals along the extension direction of the steering track. The identification probe 29 is arranged on the steering seat 28 and extends toward the steering positioning member 32 to identify the positions of the at least two steering positioning members 32.

[0117] When the steering drive mechanism 27 drives the steering seat 28 to rotate, the identification probe 29 identifies at least two steering positioning members 32. If the rotation angle of the steering seat 28 does not meet the set requirements, the steering drive mechanism 27 is triggered to drive the steering seat 28 to rotate until the identification probe 29 collects at least two steering positioning members 32 that meet the required position angles.

[0118] Wherein, at least two of the steering positioning members 32 respectively correspond to a fixed angle value and have independent identification marks for identification by the identification probe 29;

[0119] Optionally, the quality assessment module obtains the state data collected by the collection module, and calculates the state index Performance of the insulating layer and the flame retardant layer 7 of the double-layer structure according to the following formula:

[0120] ;

[0121] Wherein, D is the average diameter of the insulating layer and the flame retardant layer of the double-layer structure formed, D0 is the target diameter of the insulating layer and the flame retardant layer of the double-layer structure set by the system, and its value is set by the system (that is, set according to the actual generation situation), R is the roundness of the insulating layer and the flame retardant layer of the double-layer structure formed, T is the comprehensive thickness of the insulating layer and the flame retardant layer of the double-layer structure formed, T0 is the target thickness of the insulating layer and the flame retardant layer of the double-layer structure formed, ρ is the comprehensive density of the insulating layer and the flame retardant layer of the double-layer structure formed, and ρ0 is the target density of the insulating layer and the flame retardant layer of the double-layer structure formed;

[0122] The average diameter D of the insulating layer and the flame retardant layer of the double-layer structure is calculated according to the following formula:

[0123] ;

[0124] Where D i is the diameter data measured at the ith angle along the circumference of the insulating layer and the flame retardant layer, n is the total number of angles measured along the circumference of the insulating layer and the flame retardant layer set by the system; the diameter is the diameter of the cable;

[0125] The roundness R of the insulating layer and the flame retardant layer of the double-layer structure is calculated according to the following formula:

[0126] ;

[0127] Where D min D is the minimum value of the diameter data measured along the periphery of the insulation layer and the flame retardant layer. max It is the maximum value of the diameter data measured along the circumference of the insulating layer and the flame retardant layer;

[0128] The combined thickness T of the insulating layer and the flame retardant layer of the double-layer structure is calculated according to the following formula:

[0129] ;

[0130] Where, T i is the thickness data measured at the ith angle along the circumference of the insulating layer and the flame retardant layer, and n is the total number of angles measured along the circumference of the insulating layer and the flame retardant layer set by the system;

[0131] The comprehensive density ρ of the insulating layer and the flame retardant layer of the double-layer structure is calculated according to the following formula:

[0132] ;

[0133] In the formula, ρ fr_i is the density of the flame retardant layer measured at the i-th angle, measured by an X-ray / γ-ray density meter, T i is the thickness data measured at the i-th angle along the circumference of the insulating layer and the flame retardant layer, T is the combined thickness of the insulating layer and the flame retardant layer of the double-layer structure formed, and n is the total number of angles measured along the circumference of the insulating layer and the flame retardant layer set by the system; since the flame retardant layer is the surface layer, its density data can be obtained more accurately. In order to obtain more accurate density data, this embodiment uses the measured density of the flame retardant layer to calculate the comprehensive density of the double-layer structure.

[0134] If the state index Performance falls within the qualified monitoring threshold range [Range1, Range2] set by the system, it means that the extrusion parameters of the multi-layer co-extrusion module meet the requirements set by the system and no adjustment is required;

[0135] If the state index Performance is less than the lower limit Range1 of the qualified monitoring threshold range set by the system, the adjustment module is triggered to increase the extrusion parameters of the multi-layer co-extrusion module;

[0136] If the state index Performance is greater than the upper limit Range2 of the qualified monitoring threshold range set by the system, the adjustment module is triggered to reduce the extrusion parameters of the multi-layer co-extrusion module;

[0137] In addition, the qualified monitoring threshold range [Range1, Range2] set by the system is set by the system or the operator according to the actual situation. This is a technical means well known to technicians in this field. Technicians in this field can refer to relevant technical manuals to learn about the technology, so it is not repeated in this embodiment; through the cooperation of the acquisition module and the quality assessment module, the cable production quality can be monitored, ensuring that the entire system has the advantages of accurate quality monitoring, strong quality assessment ability and strong adaptive adjustment ability;

[0138] Through the cooperation between the adjustment module and the quality assessment module, the quality of the insulation layer and the flame retardant layer is assessed, thereby improving the monitoring capability of the entire production system for cable preparation, and ensuring that the entire system has the advantages of strong automatic control capability, good quality assessment reliability, and high flame retardancy;

[0139] The adjustment module includes an adjustment unit and an adjustment analysis unit. The adjustment analysis unit obtains the evaluation result (i.e., the state index Performance) of the quality evaluation module to analyze the extrusion parameters of the multi-layer co-extrusion module to form the parameter adjustment amount of the multi-layer co-extrusion module. The adjustment unit triggers the control of the multi-layer co-extrusion module according to the parameter adjustment amount. In this embodiment, the extrusion parameters of the multi-layer co-extrusion module include the extrusion screw speed and the extrusion temperature.

[0140] The adjustment analysis unit obtains the evaluation result Performance of the quality evaluation module and the monitoring threshold Qualified set by the system and calculates the parameter adjustment amount according to the following formula:

[0141] ;

[0142] Where △S is the extrusion screw speed adjustment, K s is the screw speed adjustment coefficient, and its value is set by the system.

[0143] ;

[0144] Where △T is the extrusion temperature adjustment, K t It is the extrusion temperature adjustment coefficient, and its value is set by the system;

[0145] In this embodiment, the screw speed adjustment coefficient K s and extrusion temperature adjustment coefficient K t The value range of is [1, 10], and when it is used in production scenarios with high requirements for extrusion temperature adjustment accuracy (such as high-precision production of flame-retardant cable insulation layer), the screw speed adjustment coefficient K s And extrusion temperature adjustment coefficient K t Set to a high value; if used in scenarios where extrusion temperature adjustment is relatively loose (such as ordinary cable outer sheath production), the screw speed adjustment coefficient K s and extrusion temperature adjustment coefficient K t Set to a low value;

[0146] In this embodiment, a screw speed adjustment coefficient K is provided. s and extrusion temperature adjustment coefficient K t The value examples are as follows:

[0147] 1) High-precision cable production

[0148] If it is used for high-precision cable production, such as high-performance flame-retardant cable insulation and high-precision pressure-resistant cable production, the cable size accuracy is extremely high and the screw speed adjustment needs to be fast, stable and accurate. s =4.0;

[0149] If used for high-precision cable production, such as high-performance flame-retardant cable insulation production, that is, the flame retardant properties and material viscosity of the cable are extremely high, and the extrusion temperature adjustment needs to be rapid and stable, then K t =8.0;

[0150] 2) General precision cable production:

[0151] If it is used for general precision cable production, such as building wiring cables and ordinary power cables, the dimensional accuracy requirements are medium, and the screw speed adjustment needs to balance quality and efficiency, then K s =2.0;

[0152] If it is used for general precision cable production, such as building wiring cables and ordinary power cables, the material viscosity requirements are medium, and the extrusion temperature adjustment needs to balance quality and efficiency, then K t =5.0;

[0153] 3) Low-precision cable production:

[0154] If it is used for low-precision cable production, such as ordinary communication cable outer sheath and ordinary industrial cable production, the dimensional accuracy requirements are relatively low, and the screw speed adjustment is based on efficiency first, then K s =1.0;

[0155] If it is used for low-precision cable production, such as ordinary communication cable outer sheath and ordinary industrial cable production, the material viscosity requirement is relatively low, and the extrusion temperature adjustment is based on efficiency first, then K s =2.0;

[0156] The adjustment analysis unit obtains the extrusion screw speed adjustment value ΔS and calculates the new screw speed S_new of the multi-layer co-extrusion module:

[0157] ;

[0158] Wherein, S_old is the original extrusion speed of the multi-layer co-extrusion module;

[0159] The adjustment analysis unit obtains the extrusion temperature adjustment amount ΔT and calculates the new extrusion temperature T_new of the multi-layer co-extrusion module:

[0160] ;

[0161] Wherein, T_old is the original extrusion temperature of the multi-layer co-extrusion module;

[0162] The adjustment unit transmits the new screw speed S_new and the new extrusion temperature T_new calculated by the adjustment analysis unit to the central processor, and triggers the central processor to control the extrusion speed and extrusion temperature of the multi-layer co-extrusion module according to the new screw speed S_new and the new extrusion temperature T_new;

[0163] Through the cooperation between the adjustment module and the multi-layer co-extrusion module, the preparation process of the cable is made more refined, ensuring that the entire system has the advantages of high extrusion quality accuracy, accurate extrusion process monitoring, high reliability of quality assessment means and high intelligence;

[0164] In this embodiment, the traction module is arranged at a position as follows: Figure 3 As shown;

[0165] The traction module includes a traction unit and a support unit, wherein the support unit supports the traction unit, and the traction unit pulls the conductor 1 and the conductor wrapped with an insulating layer and a flame retardant layer 7;

[0166] In this embodiment, the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7 are pulled by the pulling module, making the entire cable manufacturing process more efficient and accurate, and ensuring the precise control of the cable preparation of the entire system;

[0167] The support unit includes a support base and two vertical plates 35 arranged on the support base, wherein the two vertical plates 35 are parallel to each other and arranged at intervals, wherein the arrangement direction of the two vertical plates 35 is parallel to the transportation direction of the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7;

[0168] In this embodiment, the traction unit is disposed between the two vertical plates 35 and traction-transports the conductor 1 and the conductor wrapped with the insulating layer and the flame-retardant layer 7;

[0169] The traction unit includes a traction member and a limiting member, the traction member is used to pull the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7, and the limiting member is used to limit the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7;

[0170] The traction member includes an upper traction wheel 33, a lower traction wheel 37, an α traction drive mechanism 36 and a β traction drive mechanism 38. The α traction drive mechanism 36 is arranged on the upper traction wheel 33 and is drivingly connected with the upper traction wheel 33 to form an upper traction part, so that the upper traction wheel 33 rotates along its own axis. The β traction drive mechanism 38 is arranged on the lower traction wheel 37 and is drivingly connected with the lower traction wheel 37 to form a lower traction part, so that the lower traction wheel 37 rotates along its own axis.

[0171] In this embodiment, hidden grooves are provided on the circumferential sides of the upper traction wheel 33 and the lower traction wheel 37, so that the limiting member is hidden and placed in the hidden grooves;

[0172] The limiting components are respectively arranged on the upper traction wheel 33 and the lower traction wheel 37, and limit the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7, wherein the limiting components include a limiting airbag 34, an air pump, and an electronic deflation valve, wherein the air pump is connected to the limiting airbag 34 through an air filling pipe to inflate the limiting airbag 34 so that the limiting airbag 34 is inflated and bulged, and the electronic deflation valve is arranged on the limiting airbag 34 and releases the gas in the limiting airbag 34;

[0173] When it is necessary to pull the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7, the limiting airbag 34 is inflated so that the limiting airbag 34 is inflated and expanded, and pulls the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7;

[0174] The limiting airbag 34 contacts the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7, so that the conductor 1 and the conductor wrapped with the insulating layer and the flame retardant layer 7 are in stable contact, ensuring the quality and reliability of traction;

[0175] In addition, the present invention also provides a method for manufacturing a low-smoke halogen-free flame-retardant cable, and the method for manufacturing a low-smoke halogen-free flame-retardant cable comprises the following steps:

[0176] S1, processing the insulating raw material and the flame retardant raw material through the raw material processing module, and supplying the heated and stirred insulating raw material and the flame retardant raw material to the multi-layer co-extrusion module;

[0177] S2, using a multi-layer co-extrusion module to sequentially extrude an insulating material and a flame retardant material and wrap the conductor 1 around the outer periphery to form a double-layer insulating layer and a flame retardant layer 7;

[0178] S3, clamping and fastening the insulating layer and the flame retardant layer 7 of the double-layer structure formed by the clamping module, so that the insulating layer and the flame retardant layer 7 are in contact with each other;

[0179] S4, cooling the clamped and fastened double-layer structure by means of the cooling module;

[0180] S5, the acquisition module acquires status data of the insulating layer and the flame retardant layer 7 of the double-layer structure;

[0181] The state data includes the diameter, roundness, thickness and density data of the insulating layer and the flame retardant layer 7 of the formed double-layer structure;

[0182] S6, the quality assessment module assesses the insulation layer and the flame retardant layer 7 of the cable according to the state data collected by the acquisition module to determine the state index Performance of the insulation layer and the flame retardant layer 7 of the double-layer structure formed;

[0183] S7, the adjustment module triggers adjustment of the extrusion parameters of the multi-layer co-extrusion module according to the evaluation result;

[0184] If the state index Performance of the insulating layer and the flame retardant layer 7 of the formed double-layer structure is less than the lower limit Range1 of the qualified monitoring threshold range set by the system, the adjustment module is triggered to increase the extrusion parameters of the multi-layer co-extrusion module;

[0185] If the state index Performance is greater than the upper limit Range2 of the qualified monitoring threshold range set by the system, the adjustment module is triggered to reduce the extrusion parameters of the multi-layer co-extrusion module;

[0186] Optionally, the method for manufacturing the low-smoke halogen-free flame-retardant cable further includes: in step S1, the insulating raw material and the flame-retardant raw material are processed by the independent raw material processing module, and are independently supplied to the corresponding extrusion channels, and are sequentially extruded to form the insulating layer and the flame-retardant layer 7;

[0187] Optionally, the method for manufacturing the low-smoke halogen-free flame-retardant cable further includes: during the extrusion process, the conductor 1 is symmetrically arranged on the conductor 1 and the conductor 1 wrapped with the double-layer structure insulation layer and the flame-retardant layer 7 is pulled by the pulling module, so that the multi-layer co-extrusion module extrude the insulation material and the flame-retardant material along the length direction of the conductor 1 and wrap them around the outer periphery of the conductor 1;

[0188] Optionally, the method for manufacturing the low-smoke halogen-free flame-retardant cable further includes: in step S5, the acquisition module acquires performance data of at least two angles around the axis of the insulation layer and the flame-retardant layer 7 when acquiring performance data of the insulation layer and the flame-retardant layer 7 of the double-layer structure.

[0189] Embodiment 2: This embodiment should be understood to include all the features of any of the above embodiments, and further improve upon them. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the traction module also includes a traction analysis unit, which analyzes the traction speed according to the extrusion speed of the multi-layer co-extrusion module and triggers the traction unit to accurately traction the conductor 1 and the conductor wrapped with the insulation layer and the flame retardant layer 7;

[0190] The traction analysis unit obtains the new screw speed S_new of the multi-layer co-extrusion module and calculates the traction speed Pull according to the following formula:

[0191] ;

[0192] Where, L b is the expansion coefficient of the cable. The length change ratio of the cable during the cooling process depends on the thermal expansion and contraction characteristics of the cable material. L r is the stretching ratio of the cable, and its value is calculated according to the following formula:

[0193] ;

[0194] In the formula, K v is the traction speed adjustment coefficient, V e0 is the base extrusion speed, and its value is set by the system (equivalent to the default value or known value);

[0195] For traction speed adjustment factor K v It is used to adjust the relationship between the extrusion speed and the pulling speed of the multi-layer co-extrusion module to ensure that the cable maintains an appropriate stretch ratio during the extrusion and cooling process. Its value range is: K v ∈[0.01, 0.1];

[0196] Traction speed adjustment factor K v The value trend is:

[0197] High value (K v >0.05): Indicates that the stretching ratio needs to be significantly adjusted. It is suitable for scenarios with high requirements for cable dimensional accuracy, and is commonly seen in the production of high-precision insulated cables and flame-retardant cables.

[0198] Low value (K v <0.05): It means that the stretching ratio adjustment is relatively small, which is suitable for scenes with low dimensional accuracy requirements, and is commonly seen in the production of ordinary industrial cables and communication cables;

[0199] Traction speed adjustment factor Kv Determination methods include:

[0200] (1) Engineering experience: Combined with production experience and actual application, determine the stretch ratio adjustment requirements for different types of cables;

[0201] (2) Experimental data:

[0202] S11. Through a series of experiments, observe the effect of traction speed changes on cable size and condition index;

[0203] S12, adjust K v , so that the control effect of traction speed Pull is optimal;

[0204] In this example, a traction speed adjustment coefficient K is provided. v Example of value, specifically:

[0205] 1) Production of high-precision insulation and flame-retardant cables

[0206] The production of high-precision insulation and flame-retardant cables requires extremely high dimensional accuracy. The adjustment between extrusion and pulling speed needs to maintain a stable stretch ratio. v =0.08;

[0207] 2) Ordinary power cable production

[0208] Ordinary power cables have medium requirements for dimensional accuracy. The adjustment of extrusion and pulling speed should balance efficiency and quality. v =0.05;

[0209] 3) General industrial and communication cable production

[0210] Ordinary industrial and communication cables have lower requirements for dimensional accuracy, and the adjustment of extrusion and pulling speed is mainly based on efficiency. v =0.03;

[0211] 4) Low-precision cable outer sheath production

[0212] Low-precision cable outer sheath has loose requirements on dimensional accuracy and focuses on production efficiency. v =0.01;

[0213] In short, the expansion coefficient of the cable L b The specific value of needs to be determined in combination with the actual situation. This is a technical means well known to those skilled in the art. Those skilled in the art can refer to relevant technical manuals to learn about the technology, so it will not be described in detail in this embodiment;

[0214] For the cable expansion coefficient L b , its value is calculated according to the following formula:

[0215] ;

[0216] Where, L 冷却后 is the length of the cable after cooling, which is determined based on the actual situation. 冷却前 It is the length of the cable before cooling, and the value is determined according to the actual situation;

[0217] For the cable expansion coefficient L b Determine method:

[0218] 1) Experimental determination:

[0219] Through a series of cable measurement experiments during the cooling process, the length change ratio of the cable before and after cooling is obtained;

[0220] 2) Engineering experience:

[0221] Combining cable material properties with production experience, the cable expansion coefficient is estimated through historical data and material thermal expansion characteristics;

[0222] In this example, a cable expansion coefficient L is provided. b Example of value, specifically:

[0223] 1) High-precision flame-retardant cable production

[0224] In the production process of high-precision flame-retardant cables, both the insulation layer and the flame-retardant layer are required to be of high quality and have high dimensional accuracy. The insulation material may use cross-linked polyethylene (XLPE) or halogen-free low-smoke flame-retardant material. b =1.01;

[0225] 2) Ordinary power cable production

[0226] The insulation material of ordinary power cables is usually polyethylene (PE) or polyvinyl chloride (PVC). During the cooling process of the cable, the material shrinks slightly. b =0.99;

[0227] 3) Industrial cable production

[0228] Industrial cables have looser requirements on the size of the cable outer sheath and insulation layer. The outer sheath material is usually polyvinyl chloride (PVC) or polyurethane (PUR). b =1.0;

[0229] In short, the expansion coefficient of the cable L b The specific value of needs to be determined in combination with the actual situation. This is a technical means well known to those skilled in the art. Those skilled in the art can refer to relevant technical manuals to learn about the technology, so it will not be described in detail in this embodiment;

[0230] When the traction analysis unit determines the specific pulling speed Pull, the central processor is triggered to control the pulling unit according to the pulling speed, so that the pulling unit can synchronously and accurately pull the conductor and the conductor wrapped with the insulating layer and the flame retardant layer;

[0231] Through the cooperation between the pulling analysis unit and the traction unit, the conductor and the conductor wrapped with the insulating layer and the flame retardant layer can be accurately pulled, ensuring that the entire system has the advantages of accurate preparation process monitoring, strong automatic operation capability, high adjustment capability and good insulation capacity.

[0232] The contents disclosed above are only preferred feasible embodiments of the present invention, and do not limit the protection scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the protection scope of the present invention. In addition, the elements therein can be updated as technology develops.

Claims

1. A system for manufacturing a low-smoke halogen-free flame-retardant cable, the system comprising a server, a conductor, and insulating materials and flame-retardant materials, characterized in that: The low-smoke halogen-free flame-retardant cable manufacturing system further includes a raw material processing module, a multi-layer co-extrusion module, a clamping module, a traction module, a collection module, a quality assessment module, an adjustment module and a cooling module, and the server is respectively connected to the raw material processing module, the multi-layer co-extrusion module, the clamping module, the traction module, the collection module, the quality assessment module, the adjustment module and the cooling module; The raw material processing module heats and stirs the insulating raw material and the flame retardant raw material respectively, and supplies the heated and stirred insulating raw material and flame retardant raw material to the multi-layer co-extrusion module, the multi-layer co-extrusion module extrude the insulating raw material and the flame retardant raw material in sequence and wrap them around the conductor to form a double-layer structure with an insulating layer and a flame retardant layer, the clamping module clamps and tightens the cable with the double-layer structure, the cooling module cools the clamped and tightened double-layer structure, the traction module pulls the conductor and the conductor wrapped with the insulating layer and the flame retardant layer of the double-layer structure, the acquisition module acquires the status data of the insulating layer and the flame retardant layer of the double-layer structure, the quality assessment module evaluates the insulating layer and the flame retardant layer of the cable according to the status data acquired by the acquisition module to form an assessment result, and the adjustment module triggers the adjustment of the extrusion parameters of the multi-layer co-extrusion module according to the assessment result; wherein the clamping module is arranged on the extrusion route of the insulating layer and the flame retardant layer of the double-layer structure, and clamps the extruded insulating layer and the flame retardant layer; The raw material processing module includes a raw material processing unit, a heating unit and a supply unit, wherein the raw material processing unit mixes the raw materials, the heating unit heats the raw materials to make the raw materials molten, and the supply unit supplies the molten raw materials to the multi-layer co-extrusion module; The raw material processing unit comprises a stirring chamber, a stirring rod, a stirring driving mechanism and a support seat, one end of the stirring rod is drivingly connected to the stirring driving mechanism to form a mixing portion, the other end of the stirring rod extends toward a side away from the mixing portion, and the support seat is arranged in the stirring chamber to support the mixing portion; wherein the heating unit is arranged in a spiral along the extension direction of the inner wall of the stirring chamber; The multi-layer co-extrusion module comprises an extrusion head, an insulation extrusion unit and a flame retardant extrusion unit, wherein the insulation extrusion unit and the flame retardant extrusion unit are arranged on the extrusion head, the insulation extrusion unit extrude the insulation raw material and wrap it around the periphery of the conductor to form the insulation layer, and the flame retardant extrusion unit extrude the flame retardant raw material and wrap it around the periphery of the insulation layer to form the flame retardant layer; The insulating extrusion unit comprises an insulating extrusion chamber, an extrusion screw, an extrusion drive mechanism, an extrusion die, and a die placement chamber. One end of the extrusion screw is connected to the extrusion drive mechanism to form an extrusion portion. The extrusion portion is arranged on the inner wall of the insulating extrusion chamber so that the other end of the extrusion screw extends into the insulating extrusion chamber. The die placement chamber is arranged at the extrusion port of the insulating extrusion chamber. The extrusion die can be detachably loaded in the die placement chamber. The extrusion die modifies the insulating layer formed by extrusion to limit the thickness of the insulating layer. The clamping module comprises a clamping unit and a stretching unit, wherein the clamping unit clamps and fastens the insulating layer and the flame-retardant layer of the double-layer structure, and the stretching unit adjusts the position of the clamping unit; The clamping unit comprises an upper clamping plate, a lower clamping plate, and contact pads arranged on the upper clamping plate and the lower clamping plate, wherein the upper clamping plate and the lower clamping plate are symmetrically arranged on the peripheral side of the conductor pulling route, and clamp the cable wrapped with the insulating layer and the flame retardant layer from the upper and lower sides under the extension operation of the extension unit; Wherein, the extension unit is detachably connected to the upper clamping plate and the lower clamping plate respectively to adjust the positions of the upper clamping plate and the lower clamping plate; The collection module includes a collection unit and a steering unit, the collection unit collects the insulation layer and the flame retardant layer of the formed double-layer structure cable, and the steering unit adjusts the collection angle of the collection unit so that the collection unit can collect the performance data of the surrounding sides of the insulation layer and the flame retardant layer; The acquisition unit comprises an acquisition seat, a laser diameter gauge, an ultrasonic thickness gauge, an X-ray / γ-ray density meter and a data storage device. The acquisition seat is used to place the laser diameter gauge, the ultrasonic thickness gauge, the visual acquisition probe, and the X-ray / γ-ray density meter. The laser diameter gauge measures the diameter of the cable wrapped with the insulation layer and the flame retardant layer. The ultrasonic thickness gauge collects the thickness of the insulation layer and the flame retardant layer. The X-ray / γ-ray density meter collects the density data of the insulation layer and the flame retardant layer. The data storage device stores the diameter data measured by the laser diameter gauge, the thickness data measured by the ultrasonic thickness gauge, and the density data collected by the X-ray / γ-ray density meter. The quality assessment module obtains the state data collected by the acquisition module, and calculates the state index Performance of the insulating layer and the flame retardant layer of the double-layer structure according to the following formula: ； Wherein, D is the average diameter of the insulating layer and the flame retardant layer of the double-layer structure formed, D0 is the target diameter of the insulating layer and the flame retardant layer of the double-layer structure set by the system, R is the roundness of the insulating layer and the flame retardant layer of the double-layer structure formed, T is the comprehensive thickness of the insulating layer and the flame retardant layer of the double-layer structure formed, T0 is the target thickness of the insulating layer and the flame retardant layer of the double-layer structure formed, ρ is the density of the insulating layer and the flame retardant layer of the double-layer structure formed, and ρ0 is the target density of the insulating layer and the flame retardant layer of the double-layer structure formed; If the state index Performance falls within the qualified monitoring threshold range set by the system, it means that the extrusion parameters of the multi-layer co-extrusion module meet the requirements set by the system and no adjustment is required.

2. A method for manufacturing a low-smoke halogen-free flame-retardant cable, which is applied to the manufacturing system of the low-smoke halogen-free flame-retardant cable according to claim 1, characterized in that: The method for manufacturing the low-smoke halogen-free flame-retardant cable comprises the following steps: S1, processing the insulating raw material and the flame retardant raw material through the raw material processing module, and supplying the heated and stirred insulating raw material and the flame retardant raw material to the multi-layer co-extrusion module; S2, extruding the insulating raw material and the flame retardant raw material in sequence through a multi-layer co-extrusion module and wrapping the outer periphery of the conductor to form a double-layer structure having an insulating layer and a flame retardant layer; S3, clamping and fastening the formed double-layer cable by the clamping module so that the insulating layer and the flame retardant layer are in contact with each other; S4, cooling the clamped and fastened double-layer structure by means of the cooling module; S5, the acquisition module acquires status data of the insulating layer and the flame retardant layer of the double-layer structure; Wherein, the state data includes the diameter, roundness, thickness and density data of the insulating layer and the flame retardant layer of the formed double-layer structure; S6, the quality assessment module assesses the insulation layer and the flame retardant layer of the cable according to the status data collected by the acquisition module to determine the status index Performance of the insulation layer and the flame retardant layer of the double-layer structure formed; S7, the adjustment module triggers adjustment of the extrusion parameters of the multi-layer co-extrusion module according to the evaluation result; If the state index Performance of the insulating layer and the flame retardant layer of the formed double-layer structure exceeds the qualified monitoring threshold range set by the system, the adjustment module is triggered to adjust the extrusion parameters of the multi-layer co-extrusion module.

3. The method for manufacturing a low-smoke halogen-free flame-retardant cable according to claim 2, characterized in that: The method for manufacturing the low-smoke halogen-free flame-retardant cable also includes: in step S1, the insulating raw material and the flame-retardant raw material are processed by independent raw material processing modules, and are independently supplied to corresponding extrusion channels, and are extruded in sequence to form an insulating layer and a flame-retardant layer.

4. The method for manufacturing a low-smoke halogen-free flame-retardant cable according to claim 3, characterized in that: The method for manufacturing the low-smoke halogen-free flame-retardant cable also includes: during the extrusion process, the conductor and the conductor wrapped with a double-layer structure insulation layer and a flame-retardant layer are pulled by a traction module, so that the multi-layer co-extrusion module extrude the insulating material and the flame-retardant material along the length direction of the conductor and wrap them around the outer circumference of the conductor.

5. The method for manufacturing a low-smoke halogen-free flame-retardant cable according to claim 4, characterized in that: The method for manufacturing the low-smoke halogen-free flame-retardant cable further includes: in step S5, the acquisition module acquires performance data of at least two angles around the axes of the insulation layer and the flame-retardant layer when acquiring performance data of the insulation layer and the flame-retardant layer of the double-layer structure.

Images