High temperature resistant and bending resistant cable

Abstract

This invention relates to the field of cable technology, specifically disclosing a high-temperature resistant and bend-resistant cable, comprising an outer sheath, a compensating bend-limiting skeleton, a floating cavity layer, a radial guide partition, multiple core assemblies, and a compressible buffer core. The radial guide partition divides the floating cavity layer into multiple core floating cavities, forming floating gaps between the core assemblies and the core floating cavities; the compressible buffer core has a compression cavity, and the compensating bend-limiting skeleton has spaced-apart support parts and connecting parts, forming bending gaps between adjacent support parts. When the cable bends, the cross-section at the bend is controlled to flatten along the bending radial direction, and the core assemblies on the outer and inner bend sides move closer to the bending neutral region, respectively. The compressible buffer core compresses and makes way synchronously, and the compensating bend-limiting skeleton pulls and restricts bending deformation, thereby reducing core bending strain and minimizing conductor strand breakage, insulation cracking, and sheath damage under high-temperature bending conditions.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically to a high-temperature resistant and bend-resistant cable. Background Technology

[0002] High-temperature resistant cables are widely used in heating equipment, drying equipment, metallurgical equipment, welding equipment, industrial robots, and high-temperature mobile power supply scenarios. These cables not only need to withstand high ambient temperatures but are also frequently subjected to dragging, swinging, repeated bending, or localized small-radius bending. Under high-temperature conditions, the stiffness of the outer sheath and insulation layer of ordinary cables decreases, while the core assembly remains distributed along a circular cross-section. During bending, the core on the outer side of the bend is stretched, and the core on the inner side of the bend is compressed. The farther the core is from the neutral bending region, the more pronounced the tensile and compressive deformation. After prolonged use, this can easily lead to conductor strand breakage, insulation fatigue cracking, and sheath crease damage.

[0003] Chinese patent document CN213303689U discloses a flexible, bend-resistant, high-temperature wire and cable. It improves the cable's flexibility, high-temperature resistance, and bend resistance through a combination of materials including silver-plated silver-copper alloy conductors, PTFE insulation, aramid and fluoroplastic rope filling, and copper foil shielding. This type of solution mainly improves the overall flexibility of the cable through conductor, insulation, and filling materials, reducing damage caused by conventional bending. However, the relative position of the conductor core in the cable cross-section is basically fixed, making it difficult to actively change the distance between the conductor core and the neutral bending region during bending.

[0004] Under conditions of repeated bending at high temperatures, if only soft fillers or flexible sheaths are used to buffer the bending force, the cable cross-section is prone to irregular collapse, and the cores may squeeze and rub against each other. If a rigid bending-resistant layer is simply added, the overall stiffness of the cable will be increased, making the stress concentration at the bend more obvious. The existing structure lacks a composite structure that can guide the cable cross-section to flatten in a controlled manner during bending, causing the cores on both the outer and inner bend sides to move towards the bending neutral region simultaneously, and providing bending-limiting protection by the outer skeleton after reaching the set bending degree. Therefore, it is necessary to improve the internal support and clearance structure of high-temperature bending-resistant cables.

[0005] Furthermore, cables do not always bend in an ideal circular arc during actual installation and use. The opening and closing of equipment doors, the reciprocating movement of cable chains, the swinging of robotic arms, and manual wiring near heating devices all cause the cable to repeatedly form similar bending radii at certain local locations. High-temperature environments reduce the resilience of the sheath and insulation layers, and the conductor assembly tends to remain misaligned after repeated bending. The neutral zone of the local bend also changes with cross-sectional collapse. When the conductor assembly lacks a controllable radial clearance path, tensile fatigue of the conductor on the outer bend side and compression wrinkling of the insulation layer on the inner bend side accumulate simultaneously, thus shortening the cable's service life in dynamic high-temperature environments.

[0006] Meanwhile, when a conventional round cable maintains a circular cross-section at the bend, the radial distance between the cores on the outer and inner bend sides is relatively large, resulting in uneven distribution of bending strain. If the cable is directly made into a flat structure, it would affect conventional wiring, clamping, and sealing installation. Therefore, the improvement targeted by this invention is not to permanently flatten the entire cable, but rather to create a temporary, recoverable, and guided flattening action within the bending area of ​​the cable. This causes the cores to move closer to the neutral bending region at the moment of bending, and then recover with the compressible buffer core and elastic partition after the bending force is released. Summary of the Invention

[0007] This invention provides a high-temperature resistant and bend-resistant cable, aiming to solve the problems in related technologies such as the core being far from the bending neutral region under high-temperature bending conditions, large bending strain, irregular collapse of the soft layer, and the overall stiffness of the cable caused by the rigid bending limiting structure.

[0008] A high-temperature resistant and bend-resistant cable includes an outer sheath and multiple core assemblies. It also includes a compensating bend-limiting frame disposed inside the outer sheath, a floating cavity layer disposed inside the compensating bend-limiting frame, a radial guide partition disposed within the floating cavity layer, and a compressible buffer core disposed between the multiple core assemblies. The radial guide partition extends along the compressible buffer core toward the compensating bend-limiting frame and divides the floating cavity layer into multiple core floating cavities circumferentially distributed around the compressible buffer core. Multiple core assemblies are respectively disposed within their corresponding core floating cavities, with floating gaps formed between the cavity walls of the core floating cavities and the core assemblies. The compressible buffer core has a compression cavity extending along the cable length direction, and the compensating bend-limiting frame has support portions spaced apart along the cable length direction and connecting portions connecting adjacent support portions, with bending gaps formed between adjacent support portions. The compressible buffer core and the core floating cavities together provide clearance space for controlled flattening of the cross-section at the bend, so that the cross-section at the bend is controlled to flatten radially when the cable is bent.

[0009] Its effects are as follows: This structure no longer relies solely on increasing the flexibility of the cable material to resist bending, but instead pre-forms a compressible, guideable, and restrained deformation path within the cable cross-section. In a straight state, multiple core assemblies are stably separated by floating core cavities and radial guide partitions, preventing disordered displacement of the core assemblies. When the cable bends, the bend is subjected to stretching on the outer side and compression on the inner side. The compressible buffer core makes room through the compression cavity, and the radial guide partitions elastically sway as the core assemblies approach. The core assemblies undergo slight displacement along the radial guide direction within the floating gap, causing the core assemblies originally located on the outer and inner sides to move closer to the bending neutral region, geometrically reducing the distance between the core assemblies and the bending neutral region. The support and connecting parts of the compensating bending limit skeleton deflect in a controlled manner along the outer periphery of the bend, maintaining the continuity of the cable's outer structure. As the degree of bending increases, the bending gap between adjacent support parts gradually decreases on the inner side. The compensating bending limit skeleton provides controlled traction and restraint at the bend, thereby preventing the cable from being crushed into a dead bend or experiencing localized collapse. Therefore, under conditions of high-temperature softening, repeated bending, and dragging, the present invention can simultaneously reduce the tensile and compressive strain of the wire core, maintain the insulation of the wire core, limit excessive bending, and reduce the risk of sheath cracking.

[0010] Preferably, the core assembly includes a conductor, a high-temperature resistant insulation layer covering the outside of the conductor, and a sliding layer covering the outside of the high-temperature resistant insulation layer. The sliding layer slides in contact with the cavity wall of the core floating cavity, so that the core assembly generates a slight displacement along the guiding direction of the radial guide partition when the cable is bent. The effect is that the sliding layer reduces the frictional resistance between the core assembly and the core floating cavity, preventing the core assembly from being stuck and locked by the softened cavity wall when bent at high temperatures.

[0011] Preferably, the core floating cavity is an elongated oval cavity extending along the length of the cable. The radial dimension of the elongated oval cavity is larger than the outer diameter of the core assembly, and the circumferential dimension of the elongated oval cavity matches the outer diameter of the core assembly to limit the circumferential sway of the core assembly and guide its radial movement. The effect is that the movement direction of the core assembly is restricted to near the neutral bending region, preventing the core assembly from rolling circumferentially within the cavity.

[0012] Preferably, the radial guide partition is a high-temperature resistant elastic partition. Two adjacent radial guide partitions respectively form the two guide walls of the core floating cavity. The radial guide partition elastically wobbles when the core assembly approaches the bending neutral region, providing clearance space for the core assembly. The effect is that the elastic partition can both separate adjacent core assemblies and provide flexible clearance with bending deformation, preventing direct contact and wear between adjacent core assemblies.

[0013] Preferably, the outer periphery of the compressible buffer core is provided with multiple clearance recesses, which are respectively provided with multiple core floating cavities. The clearance recesses extend along the cable length direction and communicate with the corresponding core floating cavities, so as to accommodate a portion of the outer periphery of the core assembly that approaches the neutral region of the bend when the cable is bent. The effect is that the core assembly has a clear accommodating position when it approaches the central region, and the compressible buffer core does not exert hard pressure on the core assembly.

[0014] Preferably, multiple compression cavities are provided, which are circumferentially distributed around the axis of the compressible buffer core. When the cable bends, the compression cavities are compressed and deformed radially along the bend along with the compressible buffer core, providing clearance space for the core assembly located on the inner bend side. The effect is that the buffer core does not rigidly resist bending as a whole after being compressed, but achieves recoverable deformation through cavity contraction.

[0015] Preferably, the compensating bending limit frame includes multiple support rings spaced apart along the cable length and length-limiting connecting wires connecting adjacent support rings. The inner circumference of the support rings is partially connected to the floating cavity layer, and the multiple length-limiting connecting wires are arranged circumferentially around the cable, forming a bending gap between adjacent support rings. The effect is that the support rings provide circumferential support and bending limit, the length-limiting connecting wires maintain the axial connection between adjacent support rings, and allow relative deflection between adjacent support rings.

[0016] Preferably, the length-limiting connecting wire is a flexible connecting wire with low elongation in the length direction. When the cable bends, the length-limiting connecting wire is in a tensioned state on the outer bend side and pulls the adjacent support ring to cause relative deflection, so that the cross-section of the compensation bend-limiting skeleton is flattened in a controlled manner at the cable bend. The effect is that the outer bend side does not rely on the elongation of the connecting wire to adapt to the bend, but rather the tension of the length-limiting connecting wire pulls the support ring to participate in the cross-section flattening, making the skeleton deformation controllable.

[0017] Preferably, two adjacent support rings on the inner bend side abut against each other after the bending gap narrows to a set distance, thus limiting further bending of the cable. The effect is that the bending-limiting action occurs between the support rings of the compensating bending-limiting frame itself, without relying on a soft floating cavity layer to withstand rigid limiting forces, resulting in a more stable structural logic.

[0018] Preferably, the support ring is provided with compensation holes, which are arranged at intervals around the circumference of the support ring. The compensation holes are used to provide local deformation space when the cross-section of the support ring flattens due to cable bending. The effect is that the support ring has the ability to make local concessions while maintaining its bending limit support capacity, thus avoiding stress concentration in the cable bending caused by excessive ring stiffness.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are as follows: First, the present invention uses a compressible buffer core, a floating core cavity, and a radial guide partition to make the cable form a controlled flattening state at the bend. Both the outer and inner bending core assemblies move closer to the bending neutral region, thereby reducing the tensile and compressive strain borne by the core assembly in the bending state and reducing the risk of conductor strand breakage caused by repeated bending at high temperature.

[0020] Secondly, the radial guide partition of the present invention is a high-temperature resistant elastic partition, which can generate elastic sway when the core assembly moves radially closer, providing clearance space and maintaining isolation between adjacent core assemblies, avoiding direct squeezing, friction or mutual interference of core assemblies in the softened state, and improving the service life of the insulation layer.

[0021] Third, the compensation bending limit skeleton of the present invention uses a support ring, a length limiting connecting wire and a bending gap to cooperate. The length limiting connecting wire on the outer bending side pulls the support ring to participate in the cross-sectional flattening, and the support ring on the inner bending side abuts against each other to limit the position under the set bending radius, so that the cable has both bending compensation capability and can prevent small radius dead bends and irregular collapses. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention in a straight state.

[0023] Figure 2 for Figure 1 A magnified structural diagram of point A in the middle.

[0024] Figure 3 for Figure 1 Sectional view at point BB.

[0025] Figure 4 This is a schematic diagram of the structure of the present invention in a straight line state.

[0026] Figure 5 This is a schematic diagram of the structure of the compensating bending limit skeleton in this invention.

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the present invention in a bent state.

[0028] Figure 7 This is a schematic diagram of the structure of the present invention in a bent state.

[0029] Figure label: 1. Outer sheath; 2. Compensating bending limit frame; 21. Support part; 211. Compensating hole; 22. Connecting part; 23. Bending gap; 3. Floating cavity layer; 31. Core floating cavity; 4. Radial guide partition; 5. Core assembly; 51. Conductor; 52. High temperature resistant insulation layer; 53. Sliding layer; 6. Compressible buffer core; 61. Compression cavity; 62. Relief recess. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1 to 7 As shown, a high-temperature resistant and bend-resistant cable includes an outer sheath 1, a bend-compensating frame 2, a floating cavity layer 3, a radial guide partition 4, multiple core assemblies 5, and a compressible buffer core 6. The outer sheath 1 covers the outermost part of the cable to form an external wear-resistant, heat-resistant, and protective structure; the bend-compensating frame 2 is disposed inside the outer sheath 1 and is continuously distributed along the length of the cable; the floating cavity layer 3 is disposed inside the bend-compensating frame 2, and the radial guide partition 4 is disposed inside the floating cavity layer 3, dividing the floating cavity layer 3 into multiple core floating cavities 31 distributed around the compressible buffer core 6; multiple core assemblies 5 are respectively disposed in the corresponding core floating cavities 31, and there is a floating gap between the core assembly 5 and the cavity wall of the core floating cavity 31; the compressible buffer core 6 is disposed between the multiple core assemblies 5 and is located in the middle of the cable cross-section. The structure maintains the roundness of the cable cross-section in a straight state, and allows the cross-section at the bend to be flattened in a controlled manner along the bending radial direction in a bent state, so that the core assembly 5 moves closer to the bending neutral region, thereby reducing the bending strain of the core assembly 5.

[0032] The outer sheath 1 is made of high-temperature resistant elastic sheath material and covers the compensating bending limit frame 2 along the length of the cable. The inner wall of the outer sheath 1 is in close contact with the compensating bending limit frame 2, so that the outer sheath 1 provides external protection for the compensating bending limit frame 2 under dragging, friction and high temperature environments. When the outer sheath 1 is bent, it bends as a whole with the compensating bending limit frame 2, and its surface does not directly bear the positioning function of the wire core. Therefore, even if the outer sheath 1 softens to a certain extent under high temperature conditions, it will not cause the internal wire core assembly 5 to lose its guidance.

[0033] The compensating bending limit frame 2 is disposed inside the outer sheath 1. The compensating bending limit frame 2 includes multiple support parts 21 arranged at intervals along the cable length direction and connecting parts 22 connecting adjacent support parts 21. Bending gaps 23 are formed between adjacent support parts 21 and are distributed along the cable length direction. When the cable is in a straight state, the support parts 21 are arranged sequentially and maintain the outer periphery of the cable; when the cable bends, the bending gap 23 on the inner bend side decreases, and the bending gap 23 on the outer bend side increases relatively. The compensating bending limit frame 2 covers the outer periphery of the floating cavity layer 3 and maintains the continuity of the outer layer structure of the cable through the cooperation of the support parts 21 and the connecting parts 22, so that the outer layer frame can deflect in a controlled manner with the cross section at the bend and limit the cable from further bending.

[0034] The outer periphery of the support portion 21 is close to the outer sheath 1, and the inner periphery faces the floating cavity layer 3. The support portion 21 forms a continuous support profile in the circumferential direction of the cable, so that the outer sheath 1 does not directly concentrate the load to the individual core assembly 5 when subjected to external compression. The bending gap 23 between adjacent support portions 21 makes the skeleton form a segmented structure in the axial direction. When the cable is slightly bent, the angle difference between each support portion 21 is allowed, and the cable will not generate excessive bending resistance due to the continuous rigid sleeve. When the degree of cable bending increases, the inner bending side support portion 21 gradually moves closer, and the bending gap 23 bears the transition deformation before the bending limit.

[0035] The function of the connecting part 22 is to maintain the arrangement relationship between adjacent support parts 21 and to transfer the traction force generated on the outer bending side during bending to the adjacent support parts 21. The connecting part 22 does not need to form a large-area plate-like support, but rather maintains the continuity of the skeleton with a slender structure that can bend and deflect, so that the support parts 21 can be relatively deflected at the cable bend as the cross-section flattens. Thus, the compensating bending limit skeleton 2 has both support and bending limit capabilities, and does not completely prevent the coordinated deformation of the floating cavity layer 3 and the compressible buffer core 6.

[0036] In this embodiment, the support portion 21 is annular, and multiple support portions 21 are arranged at intervals along the length of the cable. The inner circumference of the support portion 21 is partially connected to the floating cavity layer 3. This partial connection allows the support portion 21 to transfer the traction force of the outer skeleton to the floating cavity layer 3, while retaining the ability of the floating cavity layer 3 to undergo local deformation at bends, thus preventing the floating cavity layer 3 from being completely locked due to a full-circle fixation. The support portion 21 forms a circumferential support structure to maintain the roundness of the cable in a straight state, and to limit bending in the bending limit state by the proximity or contact between adjacent support portions 21.

[0037] The connecting part 22 is a length-limiting connecting wire, which connects two adjacent support parts 21. The length-limiting connecting wires are arranged at intervals around the circumference of the cable and extend along the length of the cable. The length-limiting connecting wires can bend and sway with the cable bending, but they elongate in the length direction and do not compensate by being stretched themselves. When the cable bends, the length-limiting connecting wires on the outer bend side are in a taut state and pull the outer bend side of the adjacent support parts 21 to deflect relatively, so that the compensation bend-limiting skeleton 2 changes to a flattened round state at the bend; the support parts 21 on the inner bend side move closer to each other, so that the bending gap 23 gradually decreases. When it decreases to a set distance, the adjacent support parts 21 abut against each other, limiting the cable from bending further.

[0038] The support portion 21 is provided with compensation holes 211, and multiple compensation holes 211 are arranged circumferentially around the support portion 21. The compensation holes 211 are hole-like structures that penetrate the support portion 21, and provide local deformation space when the cross-section of the support portion 21 flattens due to cable bending. The compensation holes 211 located in the bending deformation direction can undergo slight deformation with the stress state of the support portion 21, so that the support portion 21 can reduce local stiffness while maintaining circumferential support and bending limiting function. Thus, the compensation and bending limiting skeleton 2 will neither hinder cable bending like a full-circle rigid sleeve, nor lose bending limiting support like a pure soft sheath.

[0039] A floating cavity layer 3 is disposed inside the compensating bending limit frame 2, and the floating cavity layer 3 is a high-temperature resistant flexible layer. The inner circumference of the support part 21 is partially connected to the floating cavity layer 3 through spaced connection points, and the partial connection positions avoid the radial movement path of the core assembly. A radial guide partition 4 is provided inside the floating cavity layer 3, which extends along the compressible buffer core 6 towards the compensating bending limit frame 2, dividing the floating cavity layer 3 into multiple core floating cavities 31. The multiple core floating cavities 31 are distributed circumferentially around the compressible buffer core 6, and each core floating cavity 31 extends along the cable length direction. The core floating cavities 31 are used to accommodate the corresponding core assembly 5 and provide space for the radial micro-displacement of the core assembly 5.

[0040] The radial guide partition 4 is a high-temperature resistant elastic partition, and two adjacent radial guide partitions 4 respectively form the two guide walls on both sides of the corresponding core floating cavity 31. The radial guide partition 4 has elastic sway capability. When the core assembly 5 moves towards the bending neutral region during bending, the radial guide partition 4 elastically bends or sways with the compression of the core assembly 5, thereby providing clearance space for the core assembly 5. The radial guide partition 4 also maintains the isolation between adjacent core floating cavities 31, so that adjacent core assemblies 5 will not directly contact or wear during bending.

[0041] The root of the radial guide baffle 4 is adjacent to the compressible buffer core 6, and its outer end extends toward the compensating bending limit frame 2. The two sides of the baffle correspond to the adjacent wire core floating cavities 31. When the wire core assembly 5 approaches the bending neutral region, the radial guide baffle 4 does not act as a rigid baffle to block the wire core assembly 5. Instead, it undergoes elastic bending on the pressure side and maintains separation support on the back pressure side, thus restricting the displacement path of the wire core assembly 5. This structure can prevent the wire core assembly 5 from circumferentially rolling or misaligned stacking within the floating cavities, thereby ensuring that the recovery path of each wire core after bending is basically consistent with its movement path during bending.

[0042] The radial guide baffle 4 and the floating cavity layer 3 are integrally formed or fixedly connected. The baffle material is a high-temperature resistant elastic material, which allows it to retain its resilience under high-temperature conditions. The baffle thickness maintains an appropriate elastic stiffness along the radial direction. The end near the compressible buffer core 6 provides support, and the end near the compensating bending limit skeleton 2 provides guidance. When the core assembly 5 moves, the baffle gradually sways rather than partially breaks or produces sharp creases.

[0043] The core floating cavity 31 is an elongated oval cavity extending along the length of the cable. The radial dimension of the elongated oval cavity is larger than the outer diameter of the core assembly 5, while the circumferential dimension is matched to the outer diameter of the core assembly 5. This dimensional relationship allows the core assembly 5 to undergo slight displacement along the direction defined by the radial guide partition 4, while being restricted to large oscillation in the circumferential direction. When the cable bends, the outer-bend core assembly 5 moves towards the bending neutral region under the combined action of the tensile tendency and the deformation of the traction skeleton by the length-limiting connecting wire; the inner-bend core assembly 5 also moves towards the bending neutral region under the combined action of the compressive tendency and the yielding of the compressible buffer core 6.

[0044] The core assembly 5 includes a conductor 51, a high-temperature resistant insulation layer 52 covering the outside of the conductor 51, and a sliding layer 53 covering the outside of the high-temperature resistant insulation layer 52. The conductor 51 is used to transmit electrical energy or signals, the high-temperature resistant insulation layer 52 is used to maintain insulation performance in high-temperature environments, and the sliding layer 53 is used to reduce friction between the core assembly 5 and the cavity wall of the core floating cavity 31. When the cable bends, the sliding layer 53 slides into contact with the cavity wall of the core floating cavity 31, allowing the core assembly 5 to move slightly in the radial guiding direction, preventing the core assembly 5 from being stuck and fixed by the floating cavity layer 3.

[0045] A compressible buffer core 6 is disposed between multiple core assemblies 5 and extends along the length of the cable. The compressible buffer core 6 has multiple compression cavities 61, which are circumferentially distributed around the axis of the compressible buffer core 6. Multiple clearance recesses 62 are provided on the outer periphery of the compressible buffer core 6, and these clearance recesses 62 are respectively disposed corresponding to multiple core floating cavities 31. The clearance recesses 62 extend along the length of the cable and communicate with the corresponding core floating cavities 31. When the core assembly 5 approaches the bending neutral region, the clearance recesses 62 can accommodate a portion of the outer periphery of the core assembly 5, and the compression cavities 61 are simultaneously compressed and deformed, providing elastic support and clearance space for the compressible buffer core 6.

[0046] The compressible buffer core 6 is located in the central region of the cable cross-section. Its function is not simply to fill gaps, but to control the amount of compression in the central region when the cable is bent and compressed. The compression cavity 61 extends through or in segments along the length of the cable. When the cable is subjected to radial compression at the bend, the compression cavity 61 first undergoes cross-sectional contraction, causing the relief recess 62 on the outer periphery of the buffer core to retract inward. In this way, the inner-bend side core assembly 5 will not be directly subjected to the rigid reaction force of the solid core when it moves towards the central region, and the outer-bend side core assembly 5 can also obtain relatively stable central support when it moves towards the neutral region.

[0047] After the clearance recess 62 is correspondingly set with the core floating cavity 31, the approaching action of the core assembly 5 has a clear stop and receiving area. The outer periphery of the part of the core assembly 5 entering the clearance recess 62 still maintains contact with the sliding layer 53, and the conductor 51 and the high-temperature resistant insulation layer 52 do not directly rub against the buffer core. After the bending force is released, the compression cavity 61 recovers its shape by material springback, and the clearance recess 62 pushes the core assembly 5 back to its initial arrangement position, thereby maintaining the cross-sectional stability of the cable after multiple bends.

[0048] In a straight state, the outer sheath 1, the compensating bending limit skeleton 2, the floating cavity layer 3, and the compressible buffer core 6 extend along the same axial direction. The core assemblies 5 are respectively located in the corresponding core floating cavities 31. The radial guide partition 4 separates adjacent core assemblies 5. The support parts 21 are arranged at intervals along the cable length direction. The length-limiting connecting wire connects adjacent support parts 21 and keeps the skeleton continuous. At this time, a floating gap is maintained between the core floating cavity 31 and the core assembly 5. The compressible buffer core 6 remains uncompressed or slightly pre-compressed, and the compensating bending limit skeleton 2 remains in a straight support state.

[0049] When the cable bends at high temperatures, the outer bend path tends to be elongated, while the inner bend path tends to be compressed. The limiting connecting wire on the outer bend side is under tension due to its low elongation in the length direction. This tensioned wire pulls the adjacent support 21, causing relative deflection and preventing disordered stretching on the outer side of the compensating bending frame 2. Instead, it causes the support 21 to flatten the cross-section at the bend. Simultaneously, the bending gap 23 between adjacent support 21 on the inner bend side decreases, compressible buffer core 6 is compressed radially along the bend, and the radial guide baffle 4 within the floating cavity layer 3 elastically oscillates as the core assembly 5 approaches.

[0050] As the cross-section at the bend flattens in a controlled manner, the outer-bend side core assembly 5 and the inner-bend side core assembly 5 move closer to the neutral bending region along their respective core floating cavities 31. The outer-bend side core assembly 5 experiences reduced tensile strain due to its proximity to the neutral bending region, while the inner-bend side core assembly 5 experiences reduced compression buildup due to its retreat towards the neutral region. The radial guide partition 4 elastically wobbles during this process, consistently separating adjacent core assemblies 5; the sliding layer 53 reduces the movement resistance of the core assembly 5; and the clearance recess 62 and the compression cavity 61 together provide space for the core assembly 5 to approach the central region.

[0051] When the cable continues to bend to the set bending radius, the adjacent support parts 21 on the inner bend side abut against each other after the bending gap 23 shrinks to the set distance, and the compensating bending limit frame 2 forms a mechanical limit on the cable's continued bending. This limit occurs between the support parts 21 and does not rely on the floating cavity layer 3 to bear the rigid abutment force, so it can still maintain reliable bending limit even when the floating cavity layer 3 is made of flexible material. After the bending external force is released, the compressible buffer core 6 and the radial guide partition 4 recover on their own elasticity, and the core assembly 5 returns to its initial position with the floating cavity layer 3 under the action of the sliding layer 53. The compensating bending limit frame 2 returns to a straight or near-straight state through the length-limiting connecting wire and the support parts 21.

[0052] Working principle: When the cable is initially straight, multiple core assemblies 5 are located in corresponding core floating cavities 31, with floating gaps maintained between the core assemblies 5 and the core floating cavities 31. Radial guide partitions 4 keep the core assemblies 5 isolated from each other. Compressible buffer cores 6 are located between the multiple core assemblies 5, and the compensating bending limit skeleton 2 is located outside the floating cavity layer 3. When the cable is bent, the length-limiting connecting wire on the outer bend side is tensioned and pulls the adjacent support part 21 to deflect, while the bending gap 23 on the inner bend side decreases. At the same time, the compressible buffer core 6 is compressed, the radial guide partition 4 elastically sways, and the core assemblies 5 move closer to the bending neutral region along the core floating cavity 31, changing the cross-section at the bend from a circle or near-circular shape to a flattened circle. When the cable bends to the set limit, the adjacent support parts 21 on the inner bend side abut against each other and limit further bending, thereby achieving stress release and bending limit protection under high temperature conditions.

[0053] During repeated bending, the outer bending side limiting connecting wire restricts excessive separation of the outer side of the support part 21 each time it is stretched. The inner bending side support part 21 controls the minimum bending radius each time it approaches the support part 21 through the bending gap 23. The compressible buffer core 6 and the radial guide partition 4 provide elastic clearance during the movement of the core assembly 5. Since the displacement of the core assembly 5 occurs within the core floating cavity 31, and adjacent core assemblies 5 are always separated by the radial guide partition 4, the bending stress will not be concentrated and transmitted to a single conductor 51, nor will multiple cores be squeezed against each other in a high-temperature softened state.

[0054] When the cable experiences localized torsion during dragging or swaying, the multiple support sections 21 of the compensating bending limit frame 2 maintain their outer circumferential contours segmented along the length direction. The length-limiting connecting wire allows the support sections 21 to deflect at a certain angle but prevents their axial spacing from being excessively stretched. The core floating cavity 31 provides radial guidance to the core assembly 5, the sliding layer 53 reduces relative motion resistance, and the buffer core absorbs internal compressive force through the compression cavity 61. With the above structure in place, the cable can maintain necessary flexibility at high temperatures and form predictable and controlled deformation in the bending area, facilitating long-term use in scenarios such as robot joints, oven doors, mobile heating equipment, and high-temperature cable chains.

[0055] In this embodiment, the high-temperature resistant insulation layer 52 is made of high-temperature resistant insulating material; the outer sheath 1, floating cavity layer 3, radial guide partition 4, and compressible buffer core 6 are made of high-temperature resistant elastic material; the support part 21 is made of heat-resistant engineering plastic, heat-resistant elastic composite material, or metal thin-walled ring; and the length-limiting connecting wire is made of aramid fiber, glass fiber, metal wire, or heat-resistant composite fiber. The above materials are only used to illustrate the structural relationship of each component meeting the requirements of high temperature resistance, low elongation, flexibility, or support performance, and do not change the core concept of this invention: reducing the bending strain of the wire core through controlled flattening.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-temperature resistant and bend-resistant cable, comprising an outer sheath and multiple core assemblies, characterized in that, It also includes a compensating bending limit skeleton disposed inside the outer sheath, a floating cavity layer disposed inside the compensating bending limit skeleton, a radial guide partition disposed inside the floating cavity layer, and a compressible buffer core disposed between the multiple core assemblies. The radial guide partition extends along the compressible buffer core toward the compensating bending limit skeleton and divides the floating cavity layer into multiple wire core floating cavities distributed circumferentially around the compressible buffer core. Multiple core assemblies are respectively disposed in corresponding core floating cavities, and a floating gap is formed between the cavity wall of the core floating cavity and the core assembly; The compressible buffer core has a compression cavity extending along the cable length direction, and the compensating bend-limiting skeleton has support portions arranged at intervals along the cable length direction and connecting portions connecting adjacent support portions, with a bending gap formed between adjacent support portions. The compressible buffer core and the floating core cavity together provide clearance for the controlled flattening of the cross section at the bend, so that the cross section at the bend is controlled to flatten along the bending radial direction when the cable is bent.

2. The high-temperature resistant and bending-resistant cable according to claim 1, characterized in that, The core assembly includes a conductor, a high-temperature resistant insulation layer covering the outside of the conductor, and a sliding layer covering the outside of the high-temperature resistant insulation layer. The sliding layer slides in contact with the cavity wall of the core floating cavity, so that the core assembly generates a slight displacement along the guiding direction of the radial guide partition when the cable is bent.

3. The high-temperature resistant and bending-resistant cable according to claim 1, characterized in that, The floating cavity of the wire core is an elongated oval cavity extending along the length of the cable. The radial dimension of the elongated oval cavity is larger than the outer diameter of the wire core assembly. The circumferential dimension of the elongated oval cavity is adapted to the outer diameter of the wire core assembly to limit the circumferential sway of the wire core assembly and guide the wire core assembly to move radially.

4. The high-temperature resistant and bending-resistant cable according to claim 3, characterized in that, The radial guide partition is a high-temperature resistant elastic partition. Two adjacent radial guide partitions respectively form the two guide walls on both sides of the core floating cavity. The radial guide partition elastically sways when the core assembly moves toward the bending neutral region to provide clearance space for the core assembly.

5. The high-temperature resistant and bending-resistant cable according to claim 4, characterized in that, The outer periphery of the compressible buffer core is provided with a plurality of clearance recesses, which are respectively provided with a plurality of core floating cavities. The clearance recesses extend along the cable length direction and communicate with the corresponding core floating cavities to accommodate a portion of the outer periphery of the core assembly that approaches the bending neutral region when the cable is bent.

6. The high-temperature resistant and bending-resistant cable according to claim 5, characterized in that, The compression chambers are configured as a plurality of circumferentially distributed around the axis of the compressible buffer core. When the cable is bent, the compression chambers are compressed and deformed radially along the bending direction with the compressible buffer core to provide clearance space for the core assembly located on the inner bend side.

7. The high-temperature resistant and bending-resistant cable according to any one of claims 1-6, characterized in that, The compensation bending limit skeleton includes multiple support rings arranged at intervals along the cable length direction and length-limiting connecting wires connecting adjacent support rings. The inner circumferential side of the support ring is partially connected to the floating cavity layer. The multiple length-limiting connecting wires are arranged at intervals around the cable circumferentially, and the bending gap is formed between two adjacent support rings.

8. The high-temperature resistant and bending-resistant cable according to claim 7, characterized in that, The length-limiting connecting wire is a flexible connecting wire with low elongation in the length direction. When the cable bends, the length-limiting connecting wire is in a tensioned state on the outer bend side and pulls the adjacent support ring to cause relative deflection, so that the cross-section of the compensation bend-limiting skeleton is controlled to flatten as the cable bends.

9. The high-temperature resistant and bending-resistant cable according to claim 8, characterized in that, The two adjacent support rings located on the inner bend side abut against each other after the bend gap narrows to a set distance to limit further bending of the cable.

10. The high-temperature resistant and bending-resistant cable according to claim 9, characterized in that, The support ring is provided with compensation holes, which are arranged at intervals around the circumference of the support ring. The compensation holes are used to provide local deformation space when the cross-section of the support ring becomes flattened at the bend of the cable.

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