A cable for a force sensor

Abstract

The present invention discloses a cable for a force sensor, the cable comprising an electrode core layer (1), an insulating layer (2), a second conductive layer (31, 32) and a protective layer (4); the second conductive layer comprises a second conductive electrode layer (31) and a second conductive layer cavity (32). The electrode core layer (1) is a single-core structure or a multi-core twisted structure; the second conductive electrode layer (31) in the second conductive layer (31, 32) is an annular sawtooth shape, one side tightly wraps the insulating layer (2), and the other side is a sawtooth shape, and forms a second conductive layer cavity (32) with the protective layer; the thickness of the insulating layer (2) is 0.5 to 20 μm; the thickness of the protective layer (4) is greater than or equal to 0.8 mm; the cable of the present invention is applied to water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines or medical fields.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables for force sensors, and in particular relates to a cable for a force sensor. Background Art

[0002] The pressure sensing cable is a pressure sensor with a coaxial design. The usual pressure sensing cable is implemented in a piezoelectric form, also known as a piezoelectric sensing cable. When the piezoelectric sensing cable is compressed or stretched, a piezoelectric effect occurs, thereby generating a charge or voltage signal proportional to the pressure. Although the pressure sensing cable made using the piezoelectric principle provides a lot of convenience for people, it still has certain defects: for example, the existing pressure sensing cable is generally made of a coaxial structure of a metal braided core wire, a piezoelectric material and a metal shell. During the manufacturing process, the piezoelectric material needs to be placed in a strong electric field for polarization, resulting in a very complicated manufacturing process. On the other hand, when objects rub against each other, one side will be negatively charged and the other side will be positively charged. This electricity generated by friction between objects is called triboelectricity. Triboelectricity is one of the most common phenomena in nature, and the conditions for the generation of triboelectricity are very broad. Therefore, if triboelectricity can be applied to pressure sensing cables, it will inevitably bring more convenience to people's lives. Summary of the invention

[0003] In view of the technical problems existing in the prior art, the object of the present invention is to provide a cable for a force sensor, the cable comprising an electrode core layer 1, an insulating layer 2, second conductive layers 31, 32 and a protective layer 4; the second conductive layer comprises a second conductive electrode layer 31 and a second conductive layer cavity 32;

[0004] And / or, the second conductive layer includes a second conductive electrode layer 32 and a second conductive layer cavity 31 .

[0005] As a preferred embodiment, the electrode core layer 1 is a single-core structure or a multi-core twisted structure;

[0006] And / or, the electrode core material is metal or alloy;

[0007] and / or, the metal is gold, silver, platinum, palladium, aluminum, nickel, copper, titanium, chromium, tin, iron, manganese, molybdenum, tungsten or vanadium;

[0008] and / or, the alloy is an aluminum alloy, a titanium alloy, a magnesium alloy, a beryllium alloy, a copper alloy, a zinc alloy, a manganese alloy, a nickel alloy, a lead alloy, a tin alloy, a cadmium alloy, a bismuth alloy, an indium alloy, a gallium alloy, a tungsten alloy, a molybdenum alloy, a niobium alloy or a tantalum alloy;

[0009] And / or, the electrode core layer multi-core twisted structure adopts a single core with a pitch ratio of 6 to 12 and a core number of 7 to 25.

[0010] As a preferred solution, the thickness of the insulating layer 2 is 0.5 to 20 μm;

[0011] And / or, the material of the insulating layer is selected from pressure-sensitive materials;

[0012] And / or, the pressure-sensitive material is a pressure-sensitive film tape.

[0013] As a preferred solution, the thickness of the protective layer 4 is greater than or equal to 0.8 mm;

[0014] And / or, the material of the protective layer is selected from any one of polyethylene plastic, polypropylene plastic, fluoroplastic, polyvinyl chloride, polyperfluoroethylene propylene, nylon, polyolefin, chlorinated polyethylene, chlorosulfonated polyethylene, silicone rubber, tetrafluoroethylene-ethylene copolymer, polytrifluorochloroethylene, polystyrene, chlorinated polyether, polyimide, polyester, ethylene-vinyl acetate copolymer EVA, thermoplastic vulcanized rubber TPV, thermoplastic polyurethane elastomer rubber TPU, ethylene propylene diene rubber EPDM or thermoplastic rubber TPR, polyethylene terephthalate PET, polytetrafluoroethylene PTFE, polydimethylsiloxane PDMS, polyvinylidene fluoride, polyester fiber, and fluorinated ethylene propylene copolymer.

[0015] As a preferred solution, the second conductive electrode layer 31 in the second conductive layers 31 and 32 is in an annular sawtooth shape, with one side tightly wrapping the insulating layer 2; the other side is in a sawtooth shape, forming a second conductive layer cavity 32 with the protective layer;

[0016] And / or, the material of the second conductive layers 31, 32 is metal or alloy; and / or, the alloy is gold, silver, platinum, palladium, aluminum, nickel, copper, titanium, chromium, tin, iron, manganese, molybdenum, tungsten or vanadium;

[0017] and / or, the alloy is an aluminum alloy, a titanium alloy, a magnesium alloy, a beryllium alloy, a copper alloy, a zinc alloy, a manganese alloy, a nickel alloy, a lead alloy, a tin alloy, a cadmium alloy, a bismuth alloy, an indium alloy, a gallium alloy, a tungsten alloy, a molybdenum alloy, a niobium alloy or a tantalum alloy;

[0018] And / or, the metal or alloy is a single piece with a triangular cross section.

[0019] The second conductive layer here can be a single triangular prism-shaped metal or alloy surrounding the insulating layer, or the second conductive layer can be pressed into a serrated shape in advance as needed and further surrounded by the insulating layer. The above preparation method can be prepared by technicians in this field according to actual needs.

[0020] As a preferred embodiment, the method for preparing the pressure-sensitive film tape comprises the following steps:

[0021] S1: Prepare the metal organic framework material ZIF-67, and then mix and grind it with fluorinated graphene and silicon carbide.

[0022] S2: adding the mixed and ground product into an organic solvent, stirring with ultrasound, and then adding ethylene-polytetrafluoroethylene copolymer, heating and stirring to dissolve.

[0023] S3: The mixed solution obtained in S2 is coated to form a thin film with a thickness of 0.1 to 2 μm. Further, the metal organic framework material ZIF-67 is prepared by the following method:

[0024] 1) Add cobalt nitrate to methanol to obtain solution A, add 2-methylimidazole to methanol to obtain solution B, pour solution A into solution B, and stir magnetically at room temperature for 5 to 12 hours.

[0025] 2) The product obtained in 1) was centrifuged, washed with methanol, and dried to obtain ZIF-67.

[0026] And / or, the mass volume ratio of the cobalt nitrate and methanol is (2-3.3) g: (15-30) mL;

[0027] And / or, the mass volume ratio of the 2-methylimidazole and methanol is (0.82-1.45) g:

[0028] (15~30)mL;

[0029] And / or, the separation rate is 8000-10000 r / min; the separation time is 6-10 min;

[0030] And / or, the drying temperature is 60-80°C.

[0031] Further, the mass ratio of ZIF-67, fluorinated graphene and silicon carbide is (1-2): (1.67-2.88): (2.25-2.96);

[0032] And / or, the particle size of the fluorinated graphene is 0.2 to 3 μm;

[0033] And / or, the particle size of the silicon carbide is 0.1-0.6 μm.

[0034] Further, the organic solvent is selected from one or several of N,N-dimethylformamide, N,N-dimethylacetamide and acetone in any proportion;

[0035] And / or, the mass ratio of the ethylene-polytetrafluoroethylene copolymer to ZIF-67 is (0.08-1):(0.2-1).

[0036] Compared with the prior art, the present invention also has the following beneficial effects:

[0037] 1. In the present invention, the second conductive layer is annular and has certain gaps in the layer. This structure has better pressure sensitivity. Compared with the cable in the prior art that has no gaps in the second conductive layer, it is more sensitive to the pressure from the outside world and can effectively avoid uneven pressure that causes the cable to malfunction.

[0038] 2. In the present invention, the fluorinated graphene used in the insulating layer material used for the cable structure has both an sp2 structure and an sp3 structure. The two-dimensional porous material ZIF-67 with multiple active sites and the ethylene-polytetrafluoroethylene copolymer form a complex structure and affinity, which can ensure that the insulating layer has better mechanical properties and is not easily scratched. At the same time, this structure can also have excellent sensitivity, and cooperate with the cable structure to enable it to exert excellent comprehensive performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a schematic diagram of the structure of the force sensor cable of the present invention.

[0041] Figure 2 It is another structural schematic diagram of a force sensor cable according to the present invention.

[0042] Figure 3 This is a flow chart for preparing the pressure-sensitive film tape of the pressure-sensitive material of the present invention. DETAILED DESCRIPTION

[0043] The following is a specific and detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

[0044] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that like reference numerals and letters denote similar items below, and thus, once an item is defined, further definition and explanation thereof is not required subsequently.

[0046] In the description of the present invention, it should be noted that the terms "front", "rear", etc. indicate directions or positional relationships based on directions or positional relationships, or directions or positional relationships in which the invention product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, the first feature above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature below, below and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. The materials and methods defined or specifically pointed out in the present invention are well known to those skilled in the art, and are not described in detail herein, which does not mean that the present invention is not fully disclosed.

[0049] Example 1

[0050] A cable for a force sensor, the cable comprising an electrode core layer 1, an insulating layer 2, second conductive layers 31, 32 and a protective layer 4; the second conductive layer comprises a second conductive electrode layer 31 and a second conductive layer cavity 32;

[0051] The second conductive layer includes a second conductive electrode layer 32 and a second conductive layer cavity 31 .

[0052] The electrode core material is aluminum;

[0053] The electrode core layer multi-core twisted structure adopts a single-core twisted structure with a pitch ratio of 6 and a root number of 7.

[0054] The thickness of the insulating layer 2 is 5 μm; the material of the insulating layer is selected from pressure-sensitive materials; and the pressure-sensitive material is a pressure-sensitive film tape.

[0055] The thickness of the protective layer 4 is equal to 2 mm; the material of the protective layer is selected from ethylene-vinyl acetate copolymer EVA.

[0056] The second conductive electrode layer 31 in the second conductive layers 31, 32 is in an annular sawtooth shape, with one side tightly wrapping the insulating layer 2; the other side is in a sawtooth shape, forming a second conductive layer cavity 32 with the protective layer; the material of the second conductive layers 31, 32 is copper alloy; the metal or alloy is a single root with a triangular cross section.

[0057] The method for preparing the pressure-sensitive film tape comprises the following steps:

[0058] S1: preparing a metal organic framework material ZIF-67, and then mixing and grinding it with fluorinated graphene and silicon carbide; wherein the mass ratio of ZIF-67, fluorinated graphene and silicon carbide is 1:1.67:2.25.

[0059] S2: adding the mixed and ground product into an organic solvent, ultrasonically stirring, and then adding ethylene-polytetrafluoroethylene copolymer, heating and stirring to dissolve; wherein the organic solvent is selected from N,N-dimethylformamide; and the mass ratio of the ethylene-polytetrafluoroethylene copolymer to ZIF-67 is 0.015:0.2.

[0060] S3: The mixed solution obtained in S2 is coated to form a thin film with a thickness of 0.5 μm.

[0061] The metal organic framework material ZIF-67 is prepared by the following method:

[0062] 1) Add cobalt nitrate to methanol to obtain solution A, wherein the mass volume ratio is 2 g:15 mL; add 2-methylimidazole to methanol to obtain solution B, wherein the mass volume ratio is 0.82 g:15 mL; pour solution A into solution B and stir magnetically at room temperature for 5 h.

[0063] 2) The product obtained in 1) is centrifuged, washed with methanol, and dried to obtain ZIF-67; the separation rate is 8000 r / min; the separation time is 6 min; and the drying temperature is 60°C.

[0064] Wherein, the particle size of the fluorinated graphene is 1 μm; and the particle size of the silicon carbide is 0.6 μm.

[0065] Example 2

[0066] A cable for a force sensor, the cable comprising an electrode core layer 1, an insulating layer 2, second conductive layers 31, 32 and a protective layer 4; the second conductive layer comprises a second conductive electrode layer 31 and a second conductive layer cavity 32;

[0067] The second conductive layer includes a second conductive electrode layer 32 and a second conductive layer cavity 31 .

[0068] The electrode core material is silver; the electrode core layer multi-core twisted structure adopts a single-core twisted structure with a pitch ratio of 12 and a root number of 29. The thickness of the insulating layer 2 is 10 μm; the material of the insulating layer is selected from a pressure-sensitive material; the pressure-sensitive material is a pressure-sensitive film tape.

[0069] The thickness of the protective layer 4 is equal to 5 mm; the material of the protective layer is selected from thermoplastic vulcanized rubber TPV.

[0070] The second conductive electrode layer 31 in the second conductive layers 31, 32 is in an annular sawtooth shape, with one side tightly wrapping the insulating layer 2; the other side is in a sawtooth shape, forming a second conductive layer cavity 32 with the protective layer; the material of the second conductive layers 31, 32 is copper alloy; the metal or alloy is a single root with a triangular cross section.

[0071] The method for preparing the pressure-sensitive film tape comprises the following steps:

[0072] S1: preparing a metal organic framework material ZIF-67, and then mixing and grinding it with fluorinated graphene and silicon carbide; wherein the mass ratio of ZIF-67, fluorinated graphene and silicon carbide is 2:2.88:2.96.

[0073] S2: adding the mixed and ground product into an organic solvent, ultrasonically stirring, and then adding ethylene-polytetrafluoroethylene copolymer, heating and stirring to dissolve; wherein the organic solvent is selected from N,N-dimethylacetamide; and the mass ratio of the ethylene-polytetrafluoroethylene copolymer to ZIF-67 is 1:1.

[0074] S3: The mixed solution obtained in S2 is coated to form a thin film with a thickness of 1 μm.

[0075] The metal organic framework material ZIF-67 is prepared by the following method:

[0076] 1) Add cobalt nitrate to methanol to obtain solution A, wherein the mass volume ratio is 3.3 g:30 mL; add 2-methylimidazole to methanol to obtain solution B, wherein the mass volume ratio is 1.45 g:30 mL; pour solution A into solution B and stir magnetically at room temperature for 12 h.

[0077] 2) The product obtained in 1) is centrifuged, washed with methanol, and dried to obtain ZIF-67; the separation rate is 10000 r / min; the separation time is 10 min; and the drying temperature is 80°C.

[0078] Wherein, the particle size of the fluorinated graphene is 0.4 μm; and the particle size of the silicon carbide is 0.3 μm.

[0079] Example 3

[0080] A cable for a force sensor, the cable comprising an electrode core layer 1, an insulating layer 2, second conductive layers 31, 32 and a protective layer 4; the second conductive layer comprises a second conductive electrode layer 31 and a second conductive layer cavity 32;

[0081] The second conductive layer includes a second conductive electrode layer 32 and a second conductive layer cavity 31 .

[0082] The electrode core material is magnesium alloy; the electrode core layer multi-core twisted structure adopts a single-core twisted structure with a pitch ratio of 6 and a root number of 13.

[0083] The thickness of the insulating layer 2 is 12 μm; the material of the insulating layer is selected from pressure-sensitive materials; and the pressure-sensitive material is a pressure-sensitive film tape.

[0084] The thickness of the protective layer 4 is equal to 4 mm; the material of the protective layer is selected from thermoplastic polyurethane elastomer rubber TPU.

[0085] The second conductive electrode layer 31 of the second conductive layers 31 and 32 is in an annular sawtooth shape, with one side tightly wrapping the insulating layer 2; the other side is in a sawtooth shape, and forms a second conductive layer cavity 32 with the protective layer; the material of the second conductive layers 31 and 32 is nickel alloy;

[0086] The metal or alloy is a single piece with a triangular cross section.

[0087] The method for preparing the pressure-sensitive film tape comprises the following steps:

[0088] S1: preparing a metal organic framework material ZIF-67, and then mixing and grinding it with fluorinated graphene and silicon carbide; wherein the mass ratio of ZIF-67, fluorinated graphene and silicon carbide is 1.2:1.98:2.37.

[0089] S2: adding the mixed and ground product into an organic solvent, ultrasonically stirring, and then adding ethylene-polytetrafluoroethylene copolymer, heating and stirring to dissolve; wherein the organic solvent is selected from N,N-dimethylformamide and acetone in a volume ratio of 1:1; the mass ratio of the ethylene-polytetrafluoroethylene copolymer and ZIF-67 is 0.5:0.42.

[0090] S3: The mixed solution obtained in S2 is coated to form a thin film with a thickness of 1.5 μm.

[0091] The metal organic framework material ZIF-67 is prepared by the following method:

[0092] 1) Add cobalt nitrate to methanol to obtain solution A, wherein the mass volume ratio is 2.3 g:20 mL; add 2-methylimidazole to methanol to obtain solution B, wherein the mass volume ratio is 1.08 g:18 mL; pour solution A into solution B and stir magnetically at room temperature for 10 h.

[0093] 2) The product obtained in 1) is centrifuged, washed with methanol, and dried to obtain ZIF-67; the separation rate is 9000 r / min; the separation time is 8 min; and the drying temperature is 70°C.

[0094] Wherein, the particle size of the fluorinated graphene is 1.2 μm; and the particle size of the silicon carbide is 0.5 μm.

[0095] Example 4

[0096] A cable for a force sensor, the cable comprising an electrode core layer 1, an insulating layer 2, second conductive layers 31, 32 and a protective layer 4; the second conductive layer comprises a second conductive electrode layer 31 and a second conductive layer cavity 32;

[0097] The second conductive layer includes a second conductive electrode layer 32 and a second conductive layer cavity 31 .

[0098] The electrode core material is zinc alloy; the electrode core layer multi-core twisted structure adopts a single-core twisted structure with a pitch ratio of 12 and a root number of 25.

[0099] The thickness of the insulating layer 2 is 16 μm; the material of the insulating layer is selected from pressure-sensitive materials; and the pressure-sensitive material is a pressure-sensitive film tape.

[0100] The thickness of the protective layer 4 is equal to 6 mm; the material of the protective layer is selected from polyethylene terephthalate PET.

[0101] The second conductive electrode layer 31 of the second conductive layers 31 and 32 is in an annular sawtooth shape, with one side tightly wrapping the insulating layer 2; the other side is in a sawtooth shape, and forms a second conductive layer cavity 32 with the protective layer; the material of the second conductive layers 31 and 32 is magnesium alloy;

[0102] The metal or alloy is a single piece with a triangular cross section.

[0103] The method for preparing the pressure-sensitive film tape comprises the following steps:

[0104] S1: preparing a metal organic framework material ZIF-67, and then mixing and grinding it with fluorinated graphene and silicon carbide; wherein the mass ratio of ZIF-67, fluorinated graphene and silicon carbide is 1.56:2.42:2.75.

[0105] S2: adding the mixed and ground product into an organic solvent, stirring ultrasonically, and then adding ethylene-polytetrafluoroethylene copolymer, heating and stirring to dissolve; wherein the organic solvent is selected from N,N-dimethylacetamide and acetone in a volume ratio of 1.5:1; the mass ratio of the ethylene-polytetrafluoroethylene copolymer and ZIF-67 is 0.7:0.5.

[0106] S3: The mixed solution obtained in S2 is coated to form a thin film with a thickness of 1.8 μm.

[0107] The metal organic framework material ZIF-67 is prepared by the following method:

[0108] 1) Add cobalt nitrate to methanol to obtain solution A, wherein the mass volume ratio is 2.8 g:25 mL; add 2-methylimidazole to methanol to obtain solution B, wherein the mass volume ratio is 1.22 g:25 mL; pour solution A into solution B and stir magnetically at room temperature for 9 h.

[0109] 2) The product obtained in 1) is centrifuged, washed with methanol, and dried to obtain ZIF-67; the separation rate is 10000 r / min; the separation time is 10 min; and the drying temperature is 75°C.

[0110] Wherein, the particle size of the fluorinated graphene is 0.9 μm; and the particle size of the silicon carbide is 0.2 μm.

[0111] Test Case

[0112] The sensitivity of the pressure-sensitive films of Examples 1 to 4 was measured according to the sensitivity calculation formula S=XR / R0 / XP, where XR is the resistance change before and after pressure is applied;

[0113] R0—resistance value before pressure is applied;

[0114] XP—pressure size, the test results are shown in Table 1.

[0115] Table 1. Test results:

[0116]

[0117] It can be seen from Table 1 that the material used for the insulating layer in the cable of the present invention has a more excellent sensitivity.

Claims

1. A cable for a force sensor, characterized in that: The cable comprises an electrode core layer (1), an insulating layer (2), a second conductive layer (31, 32) and a protective layer (4); The second conductive layer comprises a second conductive electrode layer (31) and a second conductive layer cavity (32); the second conductive electrode layer (31) in the second conductive layer (31, 32) is in an annular sawtooth shape, with one side tightly wrapping the insulating layer (2), and the other side being in a sawtooth shape, forming the second conductive layer cavity (32) with the protective layer; The material of the insulating layer is selected from a pressure-sensitive material, and the pressure-sensitive material is a pressure-sensitive film tape; The pressure-sensitive film tape is prepared by the following method: S1: Prepare the metal organic framework material ZIF-67, and then mix and grind it with fluorinated graphene and silicon carbide; S2: adding the mixed and ground product into an organic solvent, stirring with ultrasound, then adding ethylene-polytetrafluoroethylene copolymer, heating and stirring to dissolve; S3: The mixed solution obtained in S2 is coated to form a thin film with a thickness of 0.1 to 2 μm.

2. A cable for a force sensor according to claim 1, characterized in that: The electrode core layer (1) is a single-core structure or a multi-core twisted structure; And / or, the electrode core material is a metal; the metal includes one or more of gold, silver, platinum, palladium, aluminum, nickel, copper, titanium, chromium, tin, iron, manganese, molybdenum, tungsten, vanadium, aluminum alloy, titanium alloy, magnesium alloy, beryllium alloy, copper alloy, zinc alloy, manganese alloy, nickel alloy, lead alloy, tin alloy, cadmium alloy, bismuth alloy, indium alloy, gallium alloy, tungsten alloy, molybdenum alloy, niobium alloy or tantalum alloy; And / or, the electrode core layer multi-core twisted structure adopts a single core with a pitch ratio of 6 to 12 and a core number of 7 to 25.

3. A cable for a force sensor according to claim 1, characterized in that: The thickness of the insulating layer (2) is 0.5 to 20 μm.

4. A cable for a force sensor according to claim 1, characterized in that: The thickness of the protective layer (4) is greater than or equal to 0.8 mm; And / or, the material of the protective layer (4) is selected from any one of polyethylene plastic, polypropylene plastic, fluoroplastic, polyvinyl chloride, polyperfluoroethylene propylene, nylon, chlorinated polyethylene, chlorosulfonated polyethylene, silicone rubber, tetrafluoroethylene-ethylene copolymer, polytrifluorochloroethylene, polystyrene, chlorinated polyether, polyimide, polyester, ethylene-vinyl acetate copolymer EVA, thermoplastic vulcanized rubber TPV, thermoplastic polyurethane elastomer rubber TPU, ethylene propylene diene monomer rubber EPDM or thermoplastic rubber TPR, polyethylene terephthalate PET, polytetrafluoroethylene PTFE, polydimethylsiloxane PDMS, polyvinylidene fluoride, polyester fiber, and fluorinated ethylene propylene copolymer.

5. A cable for a force sensor according to claim 1, characterized in that: The material of the second conductive layer (31, 32) is metal; the metal includes one or more of gold, silver, platinum, palladium, aluminum, nickel, copper, titanium, chromium, tin, iron, manganese, molybdenum, tungsten, vanadium, aluminum alloy, titanium alloy, magnesium alloy, beryllium alloy, copper alloy, zinc alloy, manganese alloy, nickel alloy, lead alloy, tin alloy, cadmium alloy, bismuth alloy, indium alloy, gallium alloy, tungsten alloy, molybdenum alloy, niobium alloy or tantalum alloy.

6. A cable for a force sensor according to claim 1, characterized in that: The metal organic framework material ZIF-67 is prepared by the following method: 1) Add cobalt nitrate to methanol to obtain solution A, add 2-methylimidazole to methanol to obtain solution B, pour solution A into solution B, and stir magnetically at room temperature for 5 to 12 hours; 2) The product obtained in 1) was centrifuged, washed with methanol, and dried to obtain ZIF-67.

7. A cable for a force sensor according to claim 6, characterized in that: The mass volume ratio of the cobalt nitrate and methanol is (2-3.3) g: (15-30) mL; And / or, the mass volume ratio of the 2-methylimidazole and methanol is (0.82-1.45) g: (15-30) mL; And / or, the separation rate is 8000-10000 r / min, the separation time is 6-10 min, and the drying temperature is 60-80°C.

8. A cable for a force sensor according to claim 1, characterized in that: The mass ratio of the ZIF-67, fluorinated graphene and silicon carbide is (1-2): (1.67-2.88): (2.25-2.96).

9. A cable for a force sensor according to claim 8, characterized in that: The particle size of the fluorinated graphene is 0.2 to 3 μm; And / or, the particle size of the silicon carbide is 0.1-0.6 μm.

10. A cable for a force sensor according to claim 1, characterized in that: The organic solvent is selected from one or more of N,N-dimethylformamide, N,N-dimethylacetamide and acetone in any proportion; And / or, the mass ratio of the ethylene-polytetrafluoroethylene copolymer to ZIF-67 is (0.08-1):(0.2-1).

11. An application of a cable for a force sensor according to any one of claims 1 to 10, characterized in that: The cable is used in water conservancy and hydropower, railway transportation, intelligent buildings, aerospace, military industry, petrochemicals, oil wells, ships, machine tools, pipelines or medical fields.

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