Power supply cable for a hydraulic device

Abstract

The utility model provides a kind of power supply cable of hydraulic equipment, by being provided with buffer block between secondary wire core, so that when cable is extruded or twisted by external force, the elastic spacer of buffer block can absorb impact energy by deformation, disperse pressure, avoid local stress concentration to cause cable core damage, to further improve the extrusion resistance and torsion resistance of cable.Elastic spacer inside rigid support can keep the structural stability of buffer block, avoid excessive deformation of buffer block when stressed even breakage, realize buffering while extending the service life of buffer block.In addition, the outer sheath layer adopts three-layer composite structure of fluorine rubber inner layer, oil-blocking layer and nitrile rubber layer, which can provide excellent high-temperature resistance and chemical protection for the cable, while significantly improving the oil resistance of the outer sheath layer.The setting of oil-blocking layer can actively absorb and block oil penetration, prevent oil from invading the cable core, and provide multiple oil immersion barriers for the cable core, further improving the oil resistance of the cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a power supply cable for hydraulic equipment. Background Technology

[0002] The cables used in hydraulic equipment are widely used in industrial automation, heavy machinery, mining machinery and other fields. They are special cables designed specifically for hydraulic systems and integrate power transmission, signal control and data communication.

[0003] Power cables for hydraulic equipment are exposed to complex operating environments for extended periods and must withstand multiple severe challenges simultaneously. For example, in the operating system of hydraulic equipment, since the equipment uses mineral oil or synthetic hydraulic oil as the power transmission medium, the cable sheath is in continuous direct contact with the oil. The cable sheath is easily penetrated by oil molecules, resulting in swelling and deformation, loss of plasticizers, or chemical chain breakage, which affects the normal use of the cable. At the same time, the cable often needs to be twisted repeatedly at high frequency with mechanical parts, which can easily lead to conductor metal fatigue and the propagation of microcracks in the sheath, further shortening the service life of the cable.

[0004] Therefore, in order to improve the stability and safety of hydraulic equipment, it is necessary to provide an oil-resistant and pressure-resistant power cable for use in hydraulic equipment. Utility Model Content

[0005] In view of the necessity of improving the oil resistance and pressure resistance of power cables used in hydraulic equipment in the prior art, this utility model provides a power cable for hydraulic equipment.

[0006] A power supply cable for a hydraulic device includes a cable core and an inner sheath, a pressure-resistant layer, and an outer sheath sequentially covering the outer periphery of the cable core. The cable core includes a main core, with several secondary cores wound circumferentially around its outer periphery. A buffer block is provided between each of the secondary cores. The buffer block includes an elastic spacer and a rigid support member disposed within the elastic spacer. Both ends of the elastic spacer are recessed inward to form an arc-shaped groove, and the inner surface of the arc-shaped groove matches the outer surface of the secondary core. The inner sheath includes a shielding layer and a polyurethane insulation layer sequentially disposed on the outer periphery of the cable core. The pressure-resistant layer includes V-shaped elastic elements arranged in a ring array on the outer surface of the inner sheath. Both ends of the V-shaped elastic elements are fixedly connected to the outer surface of the inner sheath, and adjacent V-shaped elastic elements are interconnected. The outer sheath includes a fluororubber inner layer and a nitrile rubber outer layer sequentially covering the outer surface of the pressure-resistant layer, with an oil-blocking layer between the fluororubber inner layer and the nitrile rubber outer layer.

[0007] Furthermore, the secondary conductor includes several neutral conductors, several signal conductors, and several ground conductors wound around the outer periphery of the main conductor.

[0008] Furthermore, the shielding layer includes an aluminum-plastic composite strip and a ferrite film wrapping layer wrapped around the outside of the aluminum-plastic composite strip, and an isolation layer is provided between the aluminum-plastic composite strip and the ferrite film wrapping layer.

[0009] Furthermore, a first elastic rod is filled between one side of the V-shaped elastic element and the outer surface of the inner sheath layer; a second elastic rod is filled between the other side of the V-shaped elastic element and the inner surface of the outer sheath layer; both the first and second elastic rods are made of oil-absorbing and expanding rubber.

[0010] Furthermore, the oil-blocking layer is made of oil-absorbing and expanding rubber.

[0011] Furthermore, the oil-blocking layer is a polytetrafluoroethylene propylene layer.

[0012] Furthermore, at least one cable-opening rope is pre-embedded between the cable core and the inner sheath layer along the length of the cable core.

[0013] Furthermore, the main wire core includes a main conductor and a first insulating layer, the main conductor being disposed within the first insulating layer, and a protective layer being disposed outside the first insulating layer.

[0014] Furthermore, the secondary conductor includes a secondary conductor and a second insulating layer.

[0015] Furthermore, the thickness of the inner sheath layer is 1-1.8 mm; the thickness of the outer sheath layer is 2-3.5 mm.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a power supply cable for hydraulic equipment. By setting a buffer block between the secondary conductors, when the cable is subjected to external force compression or torsion, the elastic spacer of the buffer block can absorb impact energy through deformation, disperse pressure, and avoid local stress concentration leading to cable core damage, thereby improving the cable's resistance to compression and torsion. The rigid support inside the elastic spacer can maintain the structural stability of the buffer block, preventing excessive deformation or even breakage under force, thus extending the service life of the buffer block while achieving buffering. At the same time, the inner surface of the arc-shaped groove matches the outer surface of the secondary conductor, which can fix the position of the secondary conductor and prevent the secondary conductor from shifting or tangling during torsion. The arc-shaped structure also reduces stress concentration during torsion.

[0017] Secondly, the pressure-resistant layer incorporates V-shaped elastic elements arranged in a ring array, which can evenly distribute externally applied pressure to each V-shaped elastic element. When the cable is subjected to torsional force, the V-shaped elastic elements can elastically deform, converting the torque into elastic potential energy and reducing the impact on the cable core.

[0018] In addition, the outer sheath adopts a three-layer composite structure consisting of a fluororubber inner layer, an oil-blocking layer, and a nitrile rubber layer. This provides the cable with excellent high-temperature resistance and chemical protection while significantly improving the oil resistance of the outer sheath. The oil-blocking layer actively absorbs and blocks oil penetration, preventing oil from entering the cable core. This allows the cable core to pass through multiple oil-proof barriers, further enhancing the cable's oil resistance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the power supply cable for a hydraulic device according to the present invention; Figure 2 This is a schematic diagram of the structure of the buffer block described in this utility model.

[0020] Attached Figure Labels 1. Cable core; 11. Main core; 12. Secondary core; 121. Neutral core; 122. Signal core; 123. Grounding core; 2. Inner sheath layer; 21. Shielding layer; 22. Polyurethane insulation layer; 3. Compression-resistant layer; 31. V-shaped elastic element; 32. First elastic rod; 33. Second elastic rod; 4. Outer sheath layer; 41. Fluororubber inner layer; 42. Nitrile rubber outer layer; 43. Oil-blocking layer; 5. Buffer block; 51. Elastic spacer; 52. Rigid support; 53. Arc groove; 6. Cable opening rope. Detailed Implementation

[0021] The embodiments described below are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] refer to Figure 1 As shown, a power supply cable for a hydraulic device includes a cable core 1 and an inner sheath layer 2, a pressure-resistant layer 3, and an outer sheath layer 4 sequentially covering the outer periphery of the cable core 1. In this embodiment, the thickness of the inner sheath layer 2 is 1-1.8 mm; the thickness of the outer sheath layer 4 is 2-3.5 mm.

[0023] The dual design of the inner sheath layer 2 and the outer sheath layer 4 provides double protection for the cable core 1, significantly improving the cable's adaptability to various external environments. The pressure-resistant layer 3 disperses external pressure on the cable, extending its service life.

[0024] Specifically, the cable core 1 includes a main core 11, and several auxiliary cores 12 are wound circumferentially around the main core 11. The auxiliary cores adopt a circumferential winding layout, which makes full use of the space around the main core 11 and realizes the integrated design of multiple cores, which helps to reduce the overall outer diameter of the cable and reduce the installation space occupied.

[0025] The main conductor 11 includes a main conductor and a first insulation layer. The main conductor is disposed within the first insulation layer, and a protective layer is disposed outside the first insulation layer. The secondary conductor 12 includes a secondary conductor and a second insulation layer. The design of the first and second insulation layers improves the insulation performance of the cable core 1, avoids the risk of current short circuits or leakage, and provides all-round protection for the main conductor and the secondary conductor.

[0026] The secondary conductor 12 includes several neutral conductors 121, several signal conductors 12, and several ground conductors 123 wound around the outer periphery of the main conductor 11.

[0027] refer to Figure 1 and Figure 2 As shown, a buffer block 5 is provided between each of the sub-cores 12. The buffer block 5 includes an elastic spacer 51 and a rigid support 52 disposed within the elastic spacer 51.

[0028] When the cable is subjected to external pressure, the elastic spacer 51 of the buffer block 5 can absorb the impact energy through deformation, disperse the pressure, and prevent local stress concentration from damaging the cable core 1. At the same time, the buffer block 5 can absorb the shear stress generated by the slight displacement of the secondary core 12 during torsion, reduce the friction and wear between the secondary cores 12, and thus improve the cable's resistance to compression and torsion. The rigid support 52 inside the elastic spacer 51 can maintain the structural stability of the buffer block 5, preventing the buffer block 5 from excessively deforming or even breaking under force, thus achieving buffering while extending the service life of the buffer block 5.

[0029] Both ends of the elastic spacer 51 are recessed inward to form an arc-shaped groove 53, and the inner surface of the arc-shaped groove 53 matches the outer surface of the sub-core 12. The arc-shaped grooves 53 at both ends of the elastic spacer 51 match the surface of the sub-core 12, thereby fixing the position of the sub-core 12 and preventing the sub-core 12 from shifting or tangling during torsion. At the same time, the arc-shaped structure can reduce stress concentration during torsion.

[0030] The inner sheath layer 2 includes a shielding layer 21 and a polyurethane insulation layer 22 sequentially disposed on the outer periphery of the cable core 1. The polyurethane insulation layer 22 has excellent oil resistance and can provide the cable core 1 with a first layer of oil-resistant and protective barrier.

[0031] The shielding layer 21 includes an aluminum-plastic composite strip and a ferrite film wrapping layer wrapped around the outside of the aluminum-plastic composite strip, and an isolation layer is provided between the aluminum-plastic composite strip and the ferrite film wrapping layer.

[0032] The aluminum-plastic composite tape effectively shields against low- to mid-frequency electromagnetic interference, preventing internal signal leakage and external interference intrusion. The ferrite film wrapping layer absorbs high-frequency electromagnetic waves, compensating for the aluminum-plastic composite tape's shortcomings in high-frequency shielding. This double-layer shielding structure achieves full-frequency electromagnetic protection, suitable for various complex electromagnetic environments. The insulating layer prevents direct contact between the aluminum-plastic composite tape and the ferrite film, and also prevents oil from penetrating into the shielding layer 21 through the interlayer gaps. In this embodiment, the insulating layer is a PET film.

[0033] The pressure-resistant layer 3 includes V-shaped elastic elements 31 arranged in a ring on the outer surface of the inner sheath layer 2. Both ends of the V-shaped elastic elements 31 are fixedly connected to the outer surface of the inner sheath layer 2, and adjacent V-shaped elastic elements 31 are interconnected.

[0034] With its circular array arrangement, the V-shaped elastic elements 31 are evenly distributed on the outer surface of the inner sheath layer 2, enabling the uniform transmission of externally applied pressure to each V-shaped elastic element 31. When the cable is subjected to torsional force, the V-shaped elastic elements 31 can elastically deform, converting torque into elastic potential energy and reducing the impact on the cable core 1. Furthermore, the structural design of the V-shaped elastic elements 31 reduces the amount of material used in the pressure-resistant layer 3, achieving cable lightweighting while ensuring compressive and torsional strength.

[0035] The interconnection between adjacent V-shaped elastic elements 31 forms a continuous chain-like compressive structure. When a certain V-shaped elastic element 31 is compressed, the connected adjacent V-shaped elastic elements 31 can provide auxiliary support to prevent a single V-shaped elastic element 31 from failing due to excessive deformation.

[0036] A first elastic rod 32 is filled between one side of the V-shaped elastic element 31 and the outer surface of the inner sheath layer 2; a second elastic rod 33 is filled between the other side of the V-shaped elastic element 31 and the inner surface of the outer sheath layer 2; the first elastic rod 32 and the second elastic rod 33 are both made of oil-absorbing and expanding rubber.

[0037] The filling structure of the first elastic rod 32 and the second elastic rod 33 can improve the structural density of the pressure-resistant layer 3, thereby improving the tensile strength, pressure resistance, and structural stability of the power grid cable. Simultaneously, it can also provide limiting support for the V-shaped elastic element 31, suppressing its deformation and achieving multiple buffering of torsional or compressive forces on the cable. The oil-absorbing and expanding rubber expands upon contact with oil, actively filling the tiny gaps between the V-shaped elastic element 31 and the inner sheath layer 2 and outer sheath layer 3, forming a dynamic sealing structure. When oil leaks into the cable, the first elastic rod 32 and the second elastic rod 33 can achieve self-repair through oil absorption and expansion, effectively blocking the leakage path, thus ensuring the stability of each layer of the cable and improving its oil resistance.

[0038] The outer sheath layer 4 includes a fluororubber inner layer 41 and a nitrile rubber outer layer 42 sequentially covering the outer surface of the pressure-resistant layer 3, and an oil-blocking layer 43 is provided between the fluororubber inner layer 41 and the nitrile rubber outer layer 42.

[0039] The fluororubber inner layer 41 possesses excellent high-temperature resistance and mechanical properties, making it suitable for various working environments. Using fluororubber as the inner layer of the outer sheath 4 provides high-temperature and chemical protection for the cable. The nitrile rubber layer 42 exhibits excellent resistance to mineral oils and fuel oils, with a significantly lower swelling rate than ordinary rubber. Using nitrile rubber as the outer layer of the outer sheath 4 allows it to directly contact the oil environment, demonstrating excellent oil resistance and significantly improving the cable's oil resistance and mechanical properties. Simultaneously, the nitrile rubber layer 42 has low air permeability, effectively blocking water molecule penetration and improving the cable's moisture resistance. The oil-blocking layer 43, located in the middle, actively absorbs and blocks oil penetration, forming a physical barrier and further enhancing the cable's oil resistance.

[0040] In this embodiment, the oil-blocking layer 43 is made of oil-absorbing and expanding rubber. Specifically, the oil-absorbing and expanding rubber can be EPDM-based oil-absorbing and expanding rubber. When the nitrile rubber outer layer 42 cracks or oil enters the oil-blocking layer 43 for other reasons, the oil-absorbing and expanding rubber will expand in volume upon contact with oil, filling the tiny cracks and forming a physical barrier to prevent further oil penetration.

[0041] In some embodiments, the oil-blocking layer 43 is a polytetrafluoroethylene (PTFE) layer. PTFE layers exhibit extremely high barrier properties against mineral oil, fuel oil, synthetic oil, silicone oil, etc., with a swelling rate close to zero. The PTFE layer forms a physical barrier between the fluororubber inner layer 41 and the cable core 1, effectively blocking oil penetration and preventing cable performance degradation caused by oil intrusion into the fluororubber inner layer 41.

[0042] In some embodiments, the outer surface of the nitrile rubber layer 42 is further provided with a plasma fluorinated coating, which improves its oil resistance while ensuring the stability of the elastic properties of the nitrile rubber layer 42.

[0043] In some embodiments, at least one cable-opening rope 6 is pre-embedded between the cable core 1 and the inner sheath layer 2 along the length of the cable core. When it is necessary to open the cable, simply find one end of the cable-opening rope and pull it out to longitudinally cut the inner sheath layer 2 and the outer sheath layer 3 of the cable core along the pre-embedded path, without the need for cutting with a knife, thereby improving the efficiency of cable opening.

[0044] This utility model provides a power supply cable for hydraulic equipment. By setting a buffer block 5 and a pressure-resistant layer 3 between the secondary conductors, the cable's resistance to compression and torsion is significantly improved. Meanwhile, the outer sheath layer 4 adopts a three-layer composite structure consisting of a fluororubber inner layer 41, an oil-resistant layer 43, and a nitrile rubber layer 42, which provides excellent high-temperature resistance and chemical protection for the cable while significantly improving the oil resistance of the outer sheath layer.

[0045] The above-disclosed embodiments are merely some preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model patent application shall still fall within the scope of the present utility model.

Claims

1. A power supply cable for a hydraulic device, characterized in that, It includes a cable core and an inner sheath, a compression-resistant layer and an outer sheath, which are sequentially wrapped around the outer periphery of the cable core. The cable core includes a main core, and several secondary cores are wound around the outer periphery of the main core. A buffer block is provided between each of the secondary cores. The buffer block includes an elastic spacer and a rigid support member disposed within the elastic spacer. Both ends of the elastic spacer are recessed inward to form an arc-shaped groove, and the inner surface of the arc-shaped groove matches the outer surface of the secondary core. The inner sheath layer includes a shielding layer and a polyurethane insulation layer sequentially disposed on the outer periphery of the cable core; the compression-resistant layer includes V-shaped elastic elements arranged in a ring array on the outer surface of the inner sheath layer, both ends of the V-shaped elastic elements being fixedly connected to the outer surface of the inner sheath layer, and adjacent V-shaped elastic elements being interconnected; a first elastic rod is filled between one side of each V-shaped elastic element and the outer surface of the inner sheath layer; a second elastic rod is filled between the other side of each V-shaped elastic element and the inner surface of the outer sheath layer; both the first and second elastic rods are made of oil-absorbing and expanding rubber. The outer sheath layer includes a fluororubber inner layer and a nitrile rubber outer layer sequentially covering the outer surface of the pressure-resistant layer, and an oil-blocking layer is provided between the fluororubber inner layer and the nitrile rubber outer layer.

2. The power supply cable for a hydraulic device according to claim 1, characterized in that, The secondary conductor includes several neutral conductors, several signal conductors, and several ground conductors wound around the outer periphery of the main conductor.

3. The power supply cable for a hydraulic device according to claim 1, characterized in that, The shielding layer includes an aluminum-plastic composite strip and a ferrite film wrapping layer wrapped around the outside of the aluminum-plastic composite strip, and an isolation layer is provided between the aluminum-plastic composite strip and the ferrite film wrapping layer.

4. The power supply cable for a hydraulic device according to claim 1, characterized in that, The oil-blocking layer is made of oil-absorbing and expanding rubber.

5. The power supply cable for a hydraulic device according to claim 1, characterized in that, The oil-blocking layer is a polytetrafluoroethylene propylene layer.

6. The power supply cable for a hydraulic device according to claim 1, characterized in that, At least one cable-opening rope is pre-embedded between the cable core and the inner sheath layer along the length of the cable core.

7. The power supply cable for a hydraulic device according to claim 1, characterized in that, The main conductor includes a main conductor and a first insulation layer. The main conductor is inserted inside the first insulation layer, and a protective layer is provided outside the first insulation layer.

8. The power supply cable for a hydraulic device according to claim 1, characterized in that, The secondary conductor includes a secondary conductor and a second insulating layer.

9. The power supply cable for a hydraulic device according to claim 1, characterized in that, The thickness of the inner sheath layer is 1-1.8 mm; the thickness of the outer sheath layer is 2-3.5 mm.

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