A self-adjustable shielding driving control cable

Abstract

The utility model discloses a kind of crane control cables of self-adjustable shielding;It is related to the technical field of industrial automation equipment cable, it includes conductor, insulating layer, center tensile kelfa rubber strip, electrochromic shielding unit and sheath;Conductor unit is composed by being wrapped in conductor outside insulating layer, conductor unit is around in center tensile kelfa rubber strip outside, and it is multiple layer stack setting;Sheath is set in outermost layer, electrochromic shielding unit is set in sheath inside The application realizes the dynamic adjustment of electromagnetic shielding efficiency by electrochromic shielding unit, in combination with the synergistic effect of multilayer conductor unit and stress buffer layer, effectively reduce the damage of mechanical stress to cable structure, maintain the flexibility and reliability of cable under complex electromagnetic environment, with the advantages of dynamic adjustment shielding efficiency, prolong the service life of cable and improve the flexibility of movement.

Description

Technical Field

[0001] This utility model relates to the field of cable technology for industrial automation equipment, and in particular to a self-adjustable shielded crane control cable. Background Technology

[0002] As a core piece of equipment for material handling in industrial production, overhead cranes face multiple technical challenges because their control cables must move in three-dimensional space with the trolley, hoisting mechanism, and crane. First, the complex and variable electromagnetic environment is one of the main problems. The crane's operating area contains strong interference sources such as motors, and the intensity of this interference changes dynamically with the operating conditions. For example, the instantaneous electromagnetic interference field strength generated when the hoisting motor starts can be 8-10 times that of the steady-state condition, and traditional fixed-shield cables cannot be dynamically adjusted according to the actual interference intensity. Using fixed shielding structures such as single-layer copper mesh results in unnecessary weight burden under low-interference conditions, while failing to provide sufficient shielding effectiveness under high-interference conditions. Second, alternating mechanical stress significantly shortens cable life. During crane operation, the cable must withstand the horizontal drag force of the trolley during translation, the lateral bending stress of the trolley during lateral movement, and the vertical tensile force of the hook during lifting and lowering. This combined dynamic stress can lead to conductor breakage, insulation cracking, and other failures, resulting in an average service life of only 6-12 months for traditional crane control cables. Furthermore, there is an inherent contradiction between shielding performance and flexibility requirements. The multi-layered shielding structure used to improve anti-interference capabilities significantly increases the bending radius of the cable, typically requiring it to be more than 12 times the cable diameter. This severely restricts the cable's maneuverability within the confined spaces of a crane. Furthermore, the direct contact between the rigid shielding layer and the insulation layer is prone to wear during frequent bending, further reducing cable reliability. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] The purpose of this application is to provide a self-adjustable shielded vehicle control cable, which has the advantages of dynamically adjusting shielding effectiveness, extending cable service life and improving movement flexibility.

[0004] This application provides a self-adjustable shielded vehicle control cable, the technical solution of which is as follows: it includes a conductor, an insulation layer, a central tensile Kevlar strip, an electrochromic shielding unit, and a sheath; the insulation layer wraps around the conductor to form a conductor unit, the conductor unit surrounds the central tensile Kevlar strip, and is arranged in multiple layers; the sheath is fitted on the outermost layer, and the electrochromic shielding unit is arranged inside the sheath.

[0005] Furthermore, this application also proposes that the electrovariable shielding unit is a three-layer composite structure, which consists of a base layer, a functional layer and an electrode layer; the base layer uses a polyimide film as a supporting framework; the functional layer is formed by uniformly dispersing carbonyl iron particles in a silicone rubber matrix; the electrode layer has nano-silver films deposited on both sides of the functional layer as voltage input terminals.

[0006] Furthermore, this application also proposes that the carbonyl iron particles account for 40%-50% of the total mass of the functional layer.

[0007] Furthermore, this application also proposes that a stress buffer layer is provided between the multilayer conductor units, the stress buffer layer being composed of honeycomb polyurethane foam and elastic memory foam strips.

[0008] In summary, this application includes the following beneficial technical effects:

[0009] This application achieves dynamic adjustment of electromagnetic shielding effectiveness through electrovariable shielding units. Combined with the synergistic effect of multilayer conductor units and stress buffer layers, it effectively reduces mechanical stress damage to the cable structure, maintains the flexibility and reliability of the cable in complex electromagnetic environments, and has the advantages of dynamically adjusting shielding effectiveness, extending cable service life and improving movement flexibility. Attached Figure Description

[0010] Figure 1 This is an overall cross-sectional view of the self-adjustable shielded vehicle control cable of this application;

[0011] Explanation of reference numerals in the attached figures:

[0012] 1. Conductor; 2. Insulation layer; 3. Central tensile Kevlar strip; 4. Stress buffer layer; 5. Electrochromic shielding unit; 6. Sheath. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0014] This application proposes a crane control cable comprising a conductor 1, an insulation layer 2, a central tensile Kevlar strip 3, an electrochromic shielding unit 5, and a sheath 6. The insulation layer 2 wraps around the conductor 1 to form a conductor unit, and multiple conductor units are stacked in multiple layers around the central tensile Kevlar strip 3. The sheath 6 is located on the outermost layer, and the electrochromic shielding unit 5 is located inside the sheath 6.

[0015] Among them, the electrovariable shielding unit 5 refers to a shielding component with electric field response characteristics. Specifically, it can be implemented by using a composite conductive particle dispersion layer on a polyimide substrate. The shielding effectiveness can be adjusted by changing the electromagnetic parameters by applying voltage.

[0016] Specifically, the conductor units form a multi-layered concentric structure around the central tensile Kevlar strip 3. The conductor units are spatially staggered, so when the cable is subjected to lateral bending, the strain directions of different conductor units cancel each other out, reducing the risk of stress concentration at a single point. The electrochromic shielding unit 5 is arranged close to the inner wall of the sheath 6. It monitors the electromagnetic field strength in real time via an external circuit and adjusts the voltage accordingly, causing the conductivity of the shielding layer to dynamically change with the interference intensity. The material selection for the sheath 6 balances wear resistance and dielectric properties, preventing external environmental factors from affecting the shielding unit's function. The central tensile strip, as the main load-bearing component, bears the main load under vertical tensile conditions, while the conductor units only need to maintain electrical connection, achieving a decoupling design between mechanical and electrical functions.

[0017] Through the above technical solutions, this application achieves dynamic adaptation of electromagnetic shielding effectiveness, automatically enhances shielding capability under strong interference conditions, and reduces energy consumption under low interference conditions; through the synergistic effect of the layered conductor 1 layout and the central tensile structure, the fatigue resistance of the cable in three-dimensional motion is significantly improved; the separation design of the sheath 6 and the shielding unit maintains the cable flexibility while ensuring the shielding effect, adapting to the complex motion trajectory in the narrow space of the vehicle.

[0018] This application further proposes that the electrochromic shielding unit 5 is a three-layer composite structure, which consists of a base layer, a functional layer and an electrode layer; the base layer uses a polyimide film as a supporting framework; the functional layer is formed by uniformly dispersing carbonyl iron particles in a silicone rubber matrix; the electrode layer has nano-silver films deposited on both sides of the functional layer as voltage input terminals.

[0019] Polyimide film serves as the substrate support layer, maintaining structural integrity and preventing shielding unit breakage during repeated cable bending. The composite system of carbonyl iron particles and silicone rubber achieves permeability modulation through changes in particle orientation. When an external voltage is applied, the electric field drives the particles to deflect in a specific direction, forming an ordered structure to enhance electromagnetic wave absorption. Vapor-deposited silver nanofilms on both sides act as electrodes, creating a uniform electric field distribution when a 0-30V DC voltage is applied. By adjusting the voltage value to regulate particle orientation, the shielding effectiveness is dynamically controlled.

[0020] Through the above technical solution, this application maintains the structural stability of the shielding unit during the dynamic bending process of the crane cable. Electromagnetic shielding effectiveness is continuously adjustable within the range of 30-60dB through voltage regulation. This improves shielding performance under strong interference conditions while reducing energy consumption and cable weight under weak interference conditions. The elastic properties of the silicone rubber matrix prevent rigid friction between the shielding layer and the insulation layer 2, extending the cable's service life in three-dimensional motion scenarios.

[0021] This application further proposes that the carbonyl iron particles in the functional layer account for 40%-50% of the total mass of the functional layer.

[0022] The functional layer refers to a composite layered structure formed by uniformly dispersing carbonyl iron particles in a silicone rubber matrix. Specifically, it can be achieved by mechanically blending the particles with liquid silicone and then curing. This structure achieves synergistic effects of electromagnetic shielding and elastic deformation through the interfacial bonding between the particles and the matrix. The carbonyl iron particle content refers to the proportion of particle mass to the total mass of the functional layer. This content can be controlled by adjusting the particle-to-silicone rubber feed ratio. This ratio range maintains the overall material performance by balancing the conductive network density and matrix continuity.

[0023] Specifically, the dispersion of carbonyl iron particles in the silicone rubber matrix is ​​controlled by mass ratio. When the particle content is in the range of 40%-50%, a continuous conductive network is formed between the particles, which can effectively reflect and absorb electromagnetic waves, while the silicone rubber matrix maintains sufficient continuity to withstand dynamic bending stress. During cable operation, this ratio allows for controllable slippage at the particle-matrix interface, avoiding stress concentration caused by particle agglomeration and shielding failure caused by matrix fracture. The synergistic effect of the particles and the elastic matrix allows the shielding layer to maintain the conductive path through particle displacement during tensile deformation and to elastically recover during bending.

[0024] This application further proposes that each conductor unit is covered with a stress buffer layer 4, which is composed of honeycomb polyurethane foam and elastic memory foam strips.

[0025] Honeycomb polyurethane foam refers to a lightweight elastic material with a hexagonal pore array, which can be prepared by compression molding. Its porous structure can absorb linear stress generated by horizontal drag and vertical stretching through local compression deformation. Elastic memory foam strips refer to thermoplastic polyurethane materials with a three-dimensional cross-linked network, which can be processed into strips by extrusion molding. Its resilience can compensate for nonlinear stress generated by lateral bending and torsion through microscopic deformation.

[0026] Specifically, when the cable is subjected to the horizontal drag force of the trolley's translation, the pore walls of the honeycomb polyurethane foam undergo elastic compression, dispersing the concentrated stress to adjacent conductor units. When the cable experiences lateral bending due to the trolley's lateral movement, the molecular chains of the elastic memory foam strips undergo reversible extension, filling the gaps between conductor units through volume expansion to buffer deformation. When the hook's lifting and lowering causes vertical tension, the longitudinal support of the honeycomb structure and the lateral rebound of the memory foam work synergistically to prevent conductor 1 and insulation layer 2 from cracking due to stress concentration. This stress buffer layer 4 dissipates mechanical energy in different directions in stages, reducing the relative slippage between conductor units, thereby reducing wear on insulation layer 2 caused by repeated friction.

[0027] The cable, through the stress buffer layer 4 set in the middle and outer layer of the insulated core, can realize the slippage of the insulated core during the bending process, reduce the stress concentration of the insulated core and conductor 1, and increase the service life of the cable.

[0028] The stress buffer layer 4 installed under the electrochromic shielding unit 5 can reduce mechanical stress and damage to the shielding layer, thereby achieving better bending performance and extending the cable's service life.

[0029] This cable eliminates the multi-layer metal shielding structure commonly used in traditional cables, and its minimum bending radius can reach 4D. The cable is more flexible and greatly reduces the risk of short circuits caused by wire breakage during repeated bending of the traditional metal shielding layer, which could lead to insulation puncture.

[0030] The cable achieves dynamic adjustment of electromagnetic shielding effectiveness (30-60dB) through electro-variable shielding unit 5, with a response time ≤50ms, and is compatible with 1kHz-100MHz wideband interference.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-adjustable shielded crane control cable, characterized in that: It includes a conductor, an insulation layer, a central tensile Kevlar strip, an electrochromic shielding unit, and a sheath; the insulation layer wraps around the conductor to form a conductor unit, the conductor unit surrounds the central tensile Kevlar strip, and is arranged in multiple stacks; the sheath is placed on the outermost layer, and the electrochromic shielding unit is placed inside the sheath.

2. The self-adjustable shielded crane control cable according to claim 1, characterized in that: The electrochromic shielding unit is a three-layer composite structure, consisting of a base layer, a functional layer, and an electrode layer.

3. The self-adjustable shielded crane control cable according to claim 2, characterized in that: Each conductor unit is covered with a stress buffer layer on its outer layer.

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