Fire-resistant cable for fire service elevator and method for manufacturing the same

Abstract

The application discloses a cable core unit, a fireproof trailing cable for a fire elevator and a manufacturing method thereof. The fireproof trailing cable for the fire elevator can ensure normal operation of the fire elevator under fire conditions, especially when the fire elevator shaft is overheated or directly affected by fire, the fireproof trailing cable can still ensure power supply and control transmission characteristics of the fire elevator, ensure normal operation of the fire elevator car, improve fire safety, and reduce loss of people's life and property. The fireproof trailing cable can overcome the defects of the ordinary fire elevator trailing cable, such as no fireproof performance or having certain fireproof performance but short service life, greatly improve the fireproof performance of the fire elevator car trailing cable, ensure sufficient service life, and improve fire operation reliability of the fire elevator.

Description

Technical Field

[0001] This application relates to the technical field of fire elevator components, and more specifically, to a cable core unit, a fire-resistant traveling cable for fire elevators, and a method for manufacturing the same. Background Technology

[0002] The elevator traveling cable is an important component of vertical elevators, responsible for the control, power and communication signal transmission of the car. The cable is installed in a free-suspension manner throughout the entire lifting height of the elevator to ensure that it moves vertically with the elevator. Therefore, there are high requirements for the bending performance of the traveling cable, such as service life and bending diameter. As a result, the insulation and sheathing materials of the cable are generally made of plastic elastomer materials.

[0003] Firefighting elevators are elevators designed for firefighters to use in firefighting and rescue operations during building fires. Ordinary passenger elevators, on the other hand, must cease operation during a fire. Therefore, firefighting elevators are of particular importance to the safety of high-rise buildings and have very high fire protection requirements, making their fire-resistant design crucial. Currently, the power supply cables for firefighting elevators all use high-grade fire-resistant cables. However, the traveling cables, due to considerations such as bending life and diameter, can only use the same cables as those used in ordinary elevators, completely lacking the fire resistance required for normal operation during combustion. Current technology cannot solve the problem of using materials or structures that simultaneously possess both fire resistance and bending properties, making the traveling cable a major challenge for further improving the fire resistance rating of the power supply and control systems of firefighting elevators.

[0004] To ensure the normal operation of fire elevators during a fire, the industry currently has only one solution: to install independent elevator shafts and improve the fire resistance rating of the shafts and doors. This relies on the building structure to resist the impact of fire on the fire elevator's components and systems, thus ensuring the elevator's operation during a fire. However, in actual fires, if the fire area is large, the temperature rise of the entire structure may exceed the softening temperature of the insulation and sheathing materials of the traveling cables. In extreme cases, the disaster may spread to the fire elevator shaft, causing the fire elevator to malfunction.

[0005] The applicant persisted in researching and developing fire-resistant traveling cables that truly meet fire safety needs. In the patent technology obtained by the applicant with publication number CN216901071U, a tank-chain-like reinforcing frame was used, with rubber insulation material filled inside to ensure the bending and fire-resistant properties of the traveling optical cable. However, this technical solution has three obvious shortcomings: First, the reliability and lifespan of the reinforcing frame affect the normal operating life of the elevator under non-fire conditions; second, the fire-resistant properties of the rubber filling material result in a low bending and movement lifespan in a fire, providing only about 10 cycles of bending, which is insufficient to guarantee the needs of more frequent operation; and third, the technical solution does not provide a detailed description of the technical details and does not truly solve the core technical problems of the actual application characteristics and manufacturing of the cable. Summary of the Invention

[0006] The main objective of this application is to provide a cable core unit, a fire-resistant traveling cable for fire elevators, and a method for manufacturing the same, in order to solve the current problems.

[0007] To achieve the above objectives, this application provides the following technology:

[0008] The first aspect of this application provides a cable core unit for use as a traveling cable core of an elevator, comprising:

[0009] The conductor is formed by twisting together several annealed soft copper conductor monofilaments.

[0010] An insulating layer, serving as the insulating layer for the conductor;

[0011] A ceramic insulating frame serves as a refractory carrier for the insulating layer.

[0012] Several conductors are evenly inserted into the insulating layer to form an insulated conductor;

[0013] Several insulating conductors are evenly inserted into the ceramic insulating frame to form the cable core unit;

[0014] The free bending diameter of the cable core unit is preferably 350-600 mm.

[0015] As an optional embodiment of this application, the upper limit of the free bending diameter range of the cable core unit is optionally 850 mm.

[0016] As an alternative embodiment of this application, the insulating layer may optionally be made of a low-dropping thermosetting halogen-free polyolefin insulating material.

[0017] As an optional embodiment of this application, the number of holes in the ceramic insulating skeleton corresponds to the number of cable cores, and they are arranged in a unit section structure and sequentially fitted onto the outer surface of each insulating conductor.

[0018] As an optional embodiment of this application, each unit section of the ceramic insulating skeleton may have a circular arc surface structure at both ends, and the radius r of the circular arc surface structure is 3.3~4.6mm.

[0019] As an optional embodiment of this application, the height h of the ceramic insulating frame may optionally be 5.2~7.9mm.

[0020] A second aspect of this application provides a fire-resistant traveling cable for fire-fighting elevators, comprising:

[0021] Several cable core units as described in the first aspect;

[0022] The Shore hardness value of the plastic elastomer flame-retardant sheath ranges from 65 to 77.

[0023] The cable core unit is encased in the flame-retardant plastic elastomer sheath to form the fire-resistant traveling cable for the fire elevator; the free bending diameter of the fire-resistant traveling cable for the fire elevator is preferably 450-650 mm, with an upper limit of 1200 mm.

[0024] As an optional embodiment of this application, a reserved groove may be provided between two adjacent ceramic insulation skeletons, and the plastic elastomer flame-retardant sheath may be provided with reinforcing ribs in the reserved grooves, the reinforcing ribs being uniformly and discontinuously arranged along the entire length of the cable.

[0025] A third aspect of this application provides a manufacturing method for preparing the fire-resistant traveling cable for fire-fighting elevators as described in the second aspect, comprising the following steps:

[0026] Annealed soft copper conductors are stranded into several core conductors to form the cable core;

[0027] An insulating layer is extruded over the outside of the cable core to serve as the insulation layer of the cable core, thus obtaining an insulated wire core;

[0028] The insulated wire core was cross-linked by electron irradiation, with the irradiation dose controlled at 11±0.5MGy;

[0029] Using electrical ceramics, several ceramic insulation frames are customized according to the specifications of the cable core and the free bending diameter of the cable. The ceramic insulation frame has mounting holes for the insulated core to pass through, the number of holes corresponding to the number of cable cores, and both ends are formed with arc surface structure and reserved grooves are formed on the outer side.

[0030] The insulated wire core is threaded into the ceramic insulation skeleton, which is arranged in a unit section structure, by a traction method to obtain a ceramic fire-resistant insulated cable core assembly.

[0031] A layer of flame-retardant plastic elastomer sheath is continuously extruded over the ceramic insulated cable core assembly; wherein, the flame-retardant plastic elastomer sheath is connected between each adjacent ceramic insulation skeleton by reinforcing ribs.

[0032] As an optional embodiment of this application, the insulating layer may optionally be made of a low-dropping thermosetting halogen-free polyolefin insulating material, comprising the following components by weight:

[0033] 30-50 parts of ethylene-octene copolymer;

[0034] 10-20 parts of ethylene-butyl acrylate copolymer;

[0035] 20-30 parts copolymer polypropylene;

[0036] 20-30 parts polyoxymethylene resin;

[0037] 10-20 parts maleic anhydride-grafted ethylene-vinyl acetate copolymer;

[0038] 80-100 parts aluminum hydroxide;

[0039] 20-40 parts magnesium hydroxide;

[0040] 10-20 parts kaolin;

[0041] 1-2 parts of methacryloyloxypropyltrimethoxysilane;

[0042] 4-7 parts silicone masterbatch;

[0043] 2-3 parts of 2,2-dihydroxymethyl-1,3-propanediol (pentaerythritol);

[0044] 3-6 parts of 4,4'-thiobis(6-tert-butyl-3-methylphenol) (antioxidant 300);

[0045] 1.5 to 3 parts of trimethylolpropane trimethacrylate.

[0046] Compared with the prior art, this application can bring the following technical effects:

[0047] 1. The fire-resistant traveling cable for fire elevators provided in this application can ensure the normal operation of fire elevators in the event of a fire. In particular, when the fire elevator shaft is overheated or directly exposed to the fire, it can still ensure the normal transmission of power supply and control signals of the fire elevator, ensure the reliable operation of the fire elevator, improve fire safety, and reduce loss of life and property.

[0048] 2. The fire-resistant traveling cable of this invention can maintain the integrity of the circuit for a certain period of time (greater than 180 minutes) during a fire, and can still transmit elevator control signals normally, ensuring the normal operation of the fire elevator. Especially when the fire elevator shaft is partially burned by flames or subjected to high temperatures, it can still guarantee the normal transmission of power supply and control signals. This overcomes the shortcomings of ordinary fire elevator traveling cables, which either lack fire resistance or, although possessing fire resistance, have a short service life. It can significantly improve the fire resistance of the fire elevator car traveling cable and ensure sufficient service life, thereby improving the reliability of fire elevator operation during a fire. Attached Figure Description

[0049] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0050] Figure 1 This is a front view structural schematic diagram of the cable core unit of the present invention;

[0051] Figure 2 This is a top view of the cable core unit of the present invention;

[0052] Figure 3 This is a schematic diagram of the cross-sectional structure of the fire-resistant traveling cable for fire-fighting elevators according to the present invention. Detailed Implementation

[0053] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0056] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0057] In addition, the term "multiple" should mean two or more.

[0058] In this embodiment, the design of the general conductor material and the number of cable cores involved are not limited. Similarly, the plastic extrusion coating process and equipment involved are not limited in this embodiment.

[0059] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0060] Example 1

[0061] In this embodiment, the cable core unit, without a sheath, refers to a cable core composed of several ceramic insulating frames and several insulated wire cores, such as... Figure 1 and 2 As shown.

[0062] like Figure 1 , 2 As shown in Figure 3, the first aspect of this application provides a cable core unit for use as an elevator traveling cable, comprising:

[0063] Conductor 1 is formed by stranding several annealed soft copper conductor monofilaments; Conductor 1 is the conductive core of the cable, using a flexible multi-core stranded copper conductor 1, which is formed by stranding multiple annealed soft copper monofilaments. The correspondence between the number of monofilaments and the conductor is shown in Table 1, and the commonly used specification is 1.5mm. 2 Or 2.5mm 2 Other specifications are also covered;

[0064]

[0065] Table 1---Correspondence between conductor specifications, ceramic insulation skeleton and minimum free bending diameter of cable

[0066] Insulating layer 2 serves as the insulating layer for conductor 1; insulating layer 2 is made of a specially formulated low-dropping thermosetting halogen-free polyolefin insulation material, the specific components of which are detailed in the following embodiments.

[0067] The ceramic insulating skeleton 3 serves as the carrier of the insulating layer 2. The ceramic insulating skeleton 3 has many sections in a cable, the number of sections depending on the required length of the cable. Each section contacts each other with an arc-shaped surface 4. The free bending diameter D of the accompanying cable is controlled by the arc radius r of the arc-shaped surface, the length l of each section, and the height h. This is combined with the hardness characteristics of the cable sheath 6 material, and the corresponding relationship is shown in Table 2. The minimum height h of each section corresponds to the cross-sectional specifications of the cable conductor, and the corresponding relationship is shown in Table 1.

[0068]

[0069] Table 2---Correspondence between cable free bending diameter and ceramic insulation skeleton and elastomer sheath

[0070] Several conductors 1 are evenly inserted into the insulating layer 2 to form an insulating conductor;

[0071] Several insulating conductors are evenly inserted into the ceramic insulating frame 3 to form the cable core unit;

[0072] The free bending diameter of the cable core unit is 350-600 mm.

[0073] In this application, the free bending diameter of the cable core unit is preferably within the range mentioned above, but users can achieve a maximum of 850mm according to the design structure of this application.

[0074] like Figure 2 and 3 As shown, when preparing the fire-resistant traveling cable for the fire-fighting elevator of the second aspect of this embodiment using the above-described cable core unit:

[0075] A plastic insulation layer 2 is extruded around the conductor 1. The insulated wire core, which consists of multiple conductors 1 and insulation layer 2, is inserted into the reserved mounting holes of the ceramic insulation frame 3 to form a ceramic insulated cable core assembly.

[0076] The ceramic insulating frame 3 (with rounded transition surfaces at both ends) has many sections arranged in a unit section structure, which are in contact with each other by the arc surface 4. Each frame has a square reserved groove 5 on the arc surface.

[0077] A plastic elastomer flame-retardant sheath 6 is extruded over the ceramic insulating frame 3. The inner surface of the plastic elastomer flame-retardant sheath 6 has several sets of reinforcing ribs. When the plastic elastomer flame-retardant sheath 6 is extruded over the ceramic insulating frame 3, the reinforcing ribs on the inner surface of the plastic elastomer flame-retardant sheath 6 match the pre-reserved groove 5, thus ensuring that the plastic elastomer flame-retardant sheath 6 is firmly gripped on the outer surface of the ceramic insulating frame 3.

[0078] Among them, the Shore A hardness of the plastic elastomer flame retardant sheath 6 is 65-77, and for special cases it can be greater than 77, with a maximum of 95, and the average thickness is 1.5-2.0mm.

[0079] As an optional embodiment of this application, the free bending diameter of the cable core unit can optionally range from 450 to 650 mm. Specifically, it can be up to 1200 mm.

[0080] As shown in Table 2, this embodiment achieves different free bending diameter values ​​D for the cable by selecting different specifications of ceramic insulation skeleton 3 and elastomer sheath. The curvature and length of each specification of ceramic insulation skeleton 3 increase in a positive non-linear proportion to the free bending diameter of the corresponding cable core unit.

[0081] In this embodiment, the free bending diameter of the control cable core unit is preferably 350-600mm, and in some cases, it can be up to 850mm.

[0082] As an optional embodiment of this application, the insulating layer 2 may optionally be made of a low-drip thermosetting halogen-free polyolefin insulating material, which has the characteristics of high temperature resistance, low dripping, and wear resistance. Its application weight composition is as follows:

[0083] 30-50 parts ethylene-octene copolymer (POE), 10-20 parts ethylene-butyl acrylate copolymer (EBA), 20-30 parts copolymer polypropylene (PP), 20-30 parts polyoxymethylene resin (POM), 10-20 parts maleic anhydride grafted ethylene-vinyl acetate copolymer, 80-100 parts aluminum hydroxide, 20-40 parts magnesium hydroxide, 10-20 parts kaolin, 1-2 parts methacryloxypropyltrimethoxysilane, 4-7 parts silicone masterbatch, 2-3 parts 2,2-dimethylol-1,3-propanediol (pentaerythritol), 3-6 parts 4,4'-thiobis(6-tert-butyl-3-methylphenol) (antioxidant 300), 1.5-3 parts trimethylolpropane trimethacrylate (TMPTMA).

[0084] In application, a layer of the above-mentioned halogen-free polyolefin insulation is extruded over the soft copper conductor, with an insulation thickness of 0.8 mm.

[0085] As an optional embodiment of this application, the ceramic insulating skeleton 3 is arranged in a unit section structure and sequentially fitted onto the outer surface of each insulating conductor.

[0086] like Figure 1 and 2As shown, a ceramic insulating frame 3, arranged in unit sections, is provided on the outside of a single insulated wire core. The cross-section of the ceramic insulating frame 3 is a rectangular frame with an arc surface (the arc transition surface is reserved according to the required curvature during preparation), and several through holes are opened on its end face for passing through the insulated wire core and fixing the insulated wire core. The unit sections contact each other sequentially, and two adjacent ceramic insulating frames 3 contact each other with an arc surface 4.

[0087] When the insulated wire core passes through the ceramic insulation frame 3, a pulling method is used:

[0088] Using a suitable cable laying frame, lay out half the length of the insulated wire core and place it on a suitable bracket, the bracket length exceeding half the actual application length of the accompanying cable. Solder the conductor at the end of the laid-out insulated wire core to a non-annealed single-core bare copper conductor with a diameter of 1.72mm–3.50mm and a length of 10–50mm. Pass the insulated wire core through several ceramic insulating frames using a hardened copper conductor; the number of frames is equal to the cable's application length in meters (m) / the length of the ceramic insulating frame (l). Tighten all the ceramic insulating frames sequentially, then twist all the end wire cores together and wrap them with the ceramic insulating frames at the end positions. Finally, reel in the cable.

[0089] After all the cable core units with the ceramic insulation skeleton are threaded onto the cable reel, start from the end of the insulated wire core reel and thread the ceramic insulation skeleton back into the insulated wire core using the method described above to form a complete ceramic insulated cable core assembly. Then, use a similar method to wrap the cable end tightly and thread it onto the cable reel.

[0090] As an optional embodiment of this application, each unit section of the ceramic insulating skeleton 3 may have an arc-shaped surface 4 formed at both ends, and the radius r of the arc-shaped surface 4 is 3.3~4.6mm.

[0091] The curved surface 4 can be directly formed at the beginning and end of the ceramic insulating frame 3. The radius r of the curved surface 4 can be found in Table 2.

[0092] As an optional embodiment of this application, the height h of the ceramic insulating frame 3 may optionally be 5.2~7.9mm. See Table 2 for the specific heights of ceramic insulating frames 3 of different specifications.

[0093] Using the cable core unit of the first aspect mentioned above, a fire-resistant traveling cable core for fire elevators is prepared.

[0094] The second aspect of this application provides a fire-resistant traveling cable for fire-fighting elevators, comprising:

[0095] The cable core unit described in the first aspect;

[0096] The cable core unit is encased in the plastic elastomer flame-retardant sheath 6. As an optional embodiment of this application, the ends of each pair of adjacent ceramic insulation skeletons 3 in the cable core unit are formed with reserved grooves 5, and the inner side of the plastic elastomer flame-retardant sheath 6 is connected in the reserved grooves 5 by reinforcing ribs.

[0097] like Figures 2-3 As shown, in this embodiment, eight insulated wire cores are used, and eight circular holes are opened along the length of the ceramic insulating frame, and... Figure 2 The reserved slot 5 is shown. The eight holes in the ceramic insulating frame 3 present a longitudinally symmetrical and balanced design.

[0098] A pre-reserved groove 5 is left between two adjacent ceramic insulating frames 3, which is used to form discontinuous reinforcing ribs on the inner side of the plastic elastomer flame-retardant sheath 6 in the pre-reserved groove 5 when the plastic elastomer flame-retardant sheath 6 is extruded and covered.

[0099] When a layer of plastic elastomer flame-retardant sheath 6 is extruded onto the outside of the aforementioned ceramic insulated cable core assembly using an extrusion process, the plastic fluid enters the reserved groove 5 to form reinforcing ribs, thereby improving the gripping performance of the plastic elastomer flame-retardant sheath 6 on the ceramic insulated skeleton 3.

[0100] The final fire-resistant traveling cable for fire elevators, such as Figure 3 The cable shown is an 8-core cable. It not only operates normally under normal non-fire conditions, but also possesses fire-resistant properties in the event of a fire. In particular, when the fire elevator shaft is overheated or directly exposed to fire, it can still ensure the power supply and control signal transmission of the fire elevator car, guaranteeing the reliable operation of the fire elevator, improving fire safety, and reducing loss of life and property.

[0101] Although this embodiment describes the various conductors and insulated cores in the above-mentioned quantities, in actual use, the number of cores and nominal cross-section of the traveling cable conductors may vary depending on the type of ladder. Furthermore, when used in high-rise buildings, the length of the traveling cable is increased, requiring the addition of tension steel wire ropes. In this case, the ceramic insulation skeleton will have two more cores than the cable cores to accommodate the tension steel wire ropes, and the cable's external dimensions will also change. Any improvements made based on the technology of this application are within the scope of protection of this application.

[0102] Based on the technical implementation of this application, users can set the cable length, the number of ceramic insulation frames, and related technical parameters and dimensions according to the project plan of the fire elevator. As long as they do not deviate from the design principles of this application in form, they can be included in the scope of implementation of this application.

[0103] Example 2

[0104] A third aspect of this application provides a manufacturing method for preparing the fire-resistant traveling cable for fire-fighting elevators as described in the second aspect, comprising the following steps:

[0105] 1. Use 2.5mm 2 The conductor is made of 98 annealed soft copper monofilaments stranded together using a stranding process. The stranding pitch is 16–23 mm, and the conductor outer diameter is controlled at 2.20 mm. The cable has 8 conductor cores.

[0106] 2. In addition to the above-mentioned soft copper conductor, a layer of specially made high-temperature resistant, low-drip, wear-resistant thermosetting halogen-free polyolefin insulation is extruded, with an insulation thickness of 0.8mm. The surface of the 8 insulated wires is printed with ink to indicate serial numbers 1 to 8.

[0107] The weight composition of the specially formulated halogen-free flammable polyolefin insulation material is as follows:

[0108] 30-50 parts ethylene-octene copolymer (POE), 10-20 parts ethylene-butyl acrylate copolymer (EBA), 20-30 parts copolymer polypropylene (PP), 20-30 parts polyoxymethylene resin (POM), 10-20 parts maleic anhydride grafted ethylene-vinyl acetate copolymer, 80-100 parts aluminum hydroxide, 20-40 parts magnesium hydroxide, 10-20 parts kaolin, 1-2 parts methacryloxypropyltrimethoxysilane, 4-7 parts silicone masterbatch, 2-3 parts 2,2-dimethylol-1,3-propanediol (pentaerythritol), 3-6 parts 4,4'-thiobis(6-tert-butyl-3-methylphenol) (antioxidant 300), 1.5-3 parts trimethylolpropane trimethacrylate (TMPTMA).

[0109] 3. The extruded insulated wire core is cross-linked by electron irradiation, with the irradiation dose controlled at 11±0.5MGy.

[0110] 4. Electrical ceramics are used. A certain number of ceramic insulation frames are customized according to the cable length requirements. The shape of the ceramic insulation frame is referenced. Figures 1-3 The length l=29.4mm, the width w=42.1mm, the end face radius r=3.9mm, the height h=6.4mm, the reserved groove width w1=2.0mm, the reserved groove length l1=3.9mm, and the hole center distance: d1=4.7mm, d2=5.9mm.

[0111] 5. Using 8 suitable cable-laying frames, sequentially lay out half the length of insulated cores 1-8 and place them on a suitable bracket. The bracket length should exceed half the actual application length of the accompanying cable. The conductor at the end of each insulated core is soldered to a 2.53mm diameter, 30mm long, non-annealed single-core bare copper conductor. The insulated cores are then threaded through several ceramic insulated frames using hard copper conductors. The cable length is 60m, and the number of ceramic frames is 60 / 0.0294, totaling 2041 frames. All ceramic insulated frames are tightened sequentially. Then, all end cores are twisted together and wrapped with the ceramic insulated frames at the end positions. The cable is then reeled in.

[0112] 6. After all the insulated wire cores with the ceramic insulated skeleton are threaded onto the cable reel, starting from the end of the insulated wire core reel, use the above method to thread the ceramic insulated skeleton back into the insulated wire cores to form a complete ceramic insulated cable core assembly. Then, use a similar method to wrap the cable end tightly and thread it all onto the cable reel.

[0113] 7. On the outside of the above-mentioned ceramic insulated cable core assembly, a layer of halogen-free, low-smoke, flame-retardant plastic elastomer sheath is extruded using an extrusion process. The sheath material has a Shore A hardness of 76 and an average thickness of 1.8 mm.

[0114] 8. The free bending diameter of the fire-resistant traveling cable for the above-mentioned fire elevator is 600±50mm.

[0115] In the above preparation method, each structure can be understood with reference to the technical solution described in Example 1, and will not be repeated in this example.

[0116] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fire-resistant traveling cable for fire-fighting elevators, characterized in that, include: Several cable core units; Plastic elastomer flame-retardant sheath; The cable core unit is encased in the plastic elastomer flame-retardant sheath to form the fire-resistant traveling cable for the fire elevator. The cable core unit includes: The conductor is formed by twisting together several annealed soft copper conductor monofilaments. An insulating layer, serving as the insulating layer for the conductor; A ceramic insulating frame serves as a refractory carrier for the insulating layer. A plurality of conductors are uniformly threaded within the insulating layer to form an insulated conductor; a plurality of insulated conductors are uniformly threaded within the ceramic insulating skeleton to form the cable core unit; the insulating layer is made of a low-drip thermosetting halogen-free polyolefin insulating material, the insulating material comprising the following weight components: 30-50 parts ethylene-octene copolymer; 10-20 parts ethylene-butyl acrylate copolymer; 20-30 parts copolymer polypropylene; 20-30 parts polyoxymethylene resin; 10-20 parts maleic anhydride-grafted ethylene-vinyl acetate copolymer; 80-100 parts aluminum hydroxide; 20-40 parts magnesium hydroxide; 10-20 parts kaolin; 1-2 parts methacryloxypropyltrimethoxysilane; 4-7 parts silicone masterbatch; 2-3 parts 2,2-bis(hydroxymethyl-1,3-propanediol); 3-6 parts 4,4'-thiobis(6-tert-butyl-3-methylphenol); 1.5-3 parts trimethylolpropane trimethacrylate. The number of holes in the ceramic insulating skeleton corresponds to the number of cable cores, and they are arranged in a unit section structure and sequentially fitted onto the outer surface of each insulating conductor; the first and last ends of the ceramic insulating skeleton in each unit section are formed with an arc surface structure. A pre-reserved groove is left between two adjacent ceramic insulation skeletons, and the plastic elastomer flame-retardant sheath forms a reinforcing rib in the pre-reserved groove. The reinforcing rib is uniformly and discontinuously arranged throughout the entire length of the cable. The ceramic insulation skeleton consists of multiple sections in a single cable, the number of which depends on the required cable length. Each section contacts the others via an arc-shaped surface containing the arc structure. The free bending diameter D of the accompanying cable is 450mm, 500mm, 550mm, 600mm, or 650mm. When D is 450mm, the length l of a single ceramic insulating frame is 23.5mm, the radius r of the arc surface of the ceramic insulating frame is 3.3mm, the height h of the ceramic insulating frame ranges from 5.2 to 6.2mm, the Shore A hardness of the plastic elastomer flame retardant sheath material ranges from 65 to 72, and the thickness of the plastic elastomer flame retardant sheath is 1.5mm. When D is 500mm, the length l of a single ceramic insulating frame is 26.5mm, the radius r of the arc surface of the ceramic insulating frame is 3.6mm, the height h of the ceramic insulating frame ranges from 5.2 to 7.5mm, the Shore A hardness of the plastic elastomer flame retardant sheath material ranges from 65 to 77, and the thickness of the plastic elastomer flame retardant sheath ranges from 1.5 to 1.8mm. When D is 550mm, the length l of a single ceramic insulating frame is 29.4mm, the radius r of the arc surface of the ceramic insulating frame is 3.9mm, the height h of the ceramic insulating frame ranges from 5.2 to 7.5mm, the Shore A hardness of the plastic elastomer flame retardant sheath material ranges from 65 to 77, and the thickness of the plastic elastomer flame retardant sheath ranges from 1.5 to 1.8mm. When D is 600mm, the length l of a single ceramic insulating frame is 32.4mm, the radius r of the arc surface of the ceramic insulating frame is 4.3mm, the height h of the ceramic insulating frame ranges from 5.7 to 7.9mm, the Shore A hardness of the plastic elastomer flame retardant sheath material ranges from 73 to 77, and the thickness of the plastic elastomer flame retardant sheath ranges from 1.5 to 2.0mm. When D is 650mm, the length l of a single ceramic insulating frame is 35.3mm, the radius r of the arc surface of the ceramic insulating frame is 4.6mm, the height h of the ceramic insulating frame ranges from 5.7 to 7.9mm, the Shore A hardness of the plastic elastomer flame retardant sheath material ranges from 73 to 77, and the thickness of the plastic elastomer flame retardant sheath ranges from 1.8 to 2.0mm.

2. The fire-resistant traveling cable for fire-fighting elevators as described in claim 1, characterized in that, The free bending diameter of the cable core unit is 350-600 mm.

3. A method for manufacturing a fire-resistant traveling cable for a fire-fighting elevator as described in any one of claims 1-2, characterized in that, Includes the following steps: Annealed soft copper conductors are twisted together to form several conductors, which serve as the cable core; A low-dropping thermosetting insulation layer is extruded over the cable core as the insulation layer of the cable core to obtain an insulated wire core; The insulated wire core was cross-linked by electron irradiation, with the irradiation dose controlled at 11±0.5MGy; Using electrical ceramics, several ceramic insulation frames are customized according to the specifications of the cable core and the free bending diameter of the cable. The ceramic insulation frame has mounting holes for the insulated core to pass through, the number of holes corresponding to the number of cable cores, and the beginning and end are formed with arc-shaped surfaces and the outer side is formed with reserved grooves. The insulated wire core is threaded into the ceramic insulation skeleton, which is arranged in a unit section structure, by a traction method to obtain a ceramic fire-resistant insulated cable core assembly. A layer of plastic elastomer flame-retardant sheath is continuously extruded over the ceramic insulated cable core assembly; wherein, the plastic elastomer flame-retardant sheath is connected between each adjacent ceramic insulation skeleton by reinforcing ribs.

Images