Bending-resistant thermocouple cable and calandria flat cable

Abstract

The utility model relates to the technical field of cables, in particular to an anti-bending thermocouple cable and calandria flat cable, which comprises a cable core comprising at least two twisted insulating core wires; the insulating core wire comprises a compound stranded conductor and an insulating layer, the compound stranded conductor comprises at least three groups of bunch stranded wires which are mutually stranded, the at least three groups of bunch stranded wires are arranged in a circumferential array along the circumferential direction of the compound stranded conductor on the section of any position of the compound stranded conductor, and the insulating layer is coated outside the compound stranded conductor; the bunch of stranded wires is formed by twisting a plurality of monofilaments with the diameter of 0.08 mm; and the sheath layer is coated outside the cable core. Under the conditions that the bending radius R is less than or equal to 90mm, the movement speed is 1m / s and the acceleration is 2g / s, the requirement that the bending movement life frequency is not less than 20 million times in 10 years can be met, so that the service life of the cable in a frequent bending environment is remarkably prolonged, and the cable is particularly suitable for equipment such as a novel chip screening machine which has extremely high requirements on the bending resistance of the cable.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a bending-resistant thermocouple cable and a tube-forming flat cable. Background Art

[0002] At present, with the acceleration of domestic chip independent research and development and localization process, a new type of chip screening machine has emerged; this equipment has put forward special requirements for the matching thermocouple cables and thermocouple extension cables, that is, they must have high bending resistance; specifically, the finished cable requires a bending radius R≤90mm, meeting the movement speed of 1m / s, acceleration of 2g / s, and the bending movement life is not less than 20 million times in 10 years.

[0003] However, currently, common thermocouple cables in China are all produced in accordance with GB / T4989 "Compensation Wire for Thermocouples". At the same time, the performance of its conductor alloy wire should comply with GB / T4990 "Compensation Wire Alloy Wire for Thermocouples". According to the GB / T4989 standard, the conductors of existing compensation wires for thermocouples are divided into single conductors and multiple conductors, and the diameter range of single wires is Ф0.2mm~Ф1.76mm. When the standard compensation wire for thermocouples moves back and forth with a bending radius of R≤90mm, a movement speed of 1m / s, and an acceleration of 2g / s, the conductor will break after hundreds of times, which is far from meeting the performance requirements of the above-mentioned new chip screening machine. Therefore, a new thermocouple cable with high bending resistance and in compliance with the GB / T4990 standard is needed. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem of poor anti-bending performance of thermocouple cables in the prior art.

[0005] In order to solve the above technical problems, the utility model provides a bending-resistant thermocouple cable, comprising:

[0006] A cable core, comprising at least two twisted insulated core wires; the insulated core wires comprise a multi-twisted conductor and an insulating layer, the multi-twisted conductor comprises at least three groups of mutually twisted bundle strands, at any cross section of the multi-twisted conductor, at least three groups of the bundle strands are arranged in a circular array along the circumferential direction of the multi-twisted conductor, and the insulating layer is coated on the outside of the multi-twisted conductor; the bundle strands are formed by twisting a plurality of single wires with a diameter of 0.08 mm;

[0007] The sheath layer is coated on the outside of the cable core.

[0008] In one embodiment of the present invention, at least two of the insulating core wires include a positive insulating core wire and a negative insulating core wire, and the twisting pitch of the positive insulating core wire and the negative insulating core wire is 8D-12D.

[0009] In one embodiment of the present invention, the twisting pitch of the bundle of twisted strands is 5D-7D.

[0010] In one embodiment of the present invention, the multi-twisted conductor is formed by twisting three groups of stranded wires together, and in any cross section of the multi-twisted conductor, the three groups of stranded wires are arranged in an equilateral triangle.

[0011] In an embodiment of the present invention, the insulating layer is made of poly(fluoroethylene propylene) material.

[0012] In an embodiment of the present invention, the sheath layer is made of ethylene propylene rubber elastomer.

[0013] The utility model also provides a tube-laying flat cable, comprising the anti-bending thermocouple cable.

[0014] In one embodiment of the present invention, the tube-type flat cable comprises:

[0015] One or more KX-type thermocouple cable groups, wherein the KX-type thermocouple cable group includes at least two first anti-bending thermocouple cables;

[0016] One or more TX type thermocouple cable groups, wherein the TX type thermocouple cable group includes a plurality of second anti-bending thermocouple cables;

[0017] The outer sheath is covered on the outer sides of the KX type thermocouple cable group and the TX type thermocouple cable group.

[0018] In one embodiment of the utility model, in the first bending-resistant thermocouple cable, the single wire in the positive insulating core wire is made of nickel-chromium alloy material, and the single wire in the negative insulating core wire is made of nickel-silicon alloy material; in the second bending-resistant thermocouple cable, the single wire in the positive insulating core wire is made of copper, and the single wire in the negative insulating core wire is made of copper-nickel alloy material.

[0019] In an embodiment of the present invention, the outer sheath is made of polyether polyurethane.

[0020] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0021] First of all, the utility model greatly enhances the flexibility and bending resistance of the thermocouple cable by adopting structures such as a bundle of stranded wires formed by twisting multiple single wires with a diameter of 0.08mm, a multi-twisted conductor formed by twisting bundles of stranded wires, and a cable core formed by twisting insulated core wires. Under the conditions of a bending radius R≤90mm, a movement speed of 1m / s, and an acceleration of 2g / s, the cable can meet the requirement of a bending movement life of not less than 20 million times in 10 years, thereby significantly improving the service life of the cable in a frequent bending environment, and is particularly suitable for new chip screening machines and other equipment that have extremely high requirements on the cable's bending resistance.

[0022] Secondly, the utility model adopts polytetrafluoroethylene propylene material for the insulation layer and low-hardness and high-elasticity rubber-plastic material for the sheath layer, which further improves the bending resistance of the thermocouple cable. At the same time, the insulation layer and the sheath layer also have good electrical insulation performance, high temperature resistance and chemical stability, which can ensure the long-term stable operation of the cable in a high-intensity environment, thereby improving the safety and reliability of the cable.

[0023] Finally, the thermocouple cable in the utility model not only meets the GB / T4990 standard, but also in actual tests, the thermoelectromotive force range and tolerance of the KX type and TX type thermocouple conductors fully meet the standard requirements, showing excellent thermoelectric performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0025] Figure 1 It is a structural schematic diagram of the utility model anti-bending thermocouple cable;

[0026] Figure 2 It is a structural schematic diagram of the utility model of the tube-laying flat cable.

[0027] Explanation of the reference numerals in the specification: 20, cable core; 21, insulating core wire; 21A, positive insulating core wire; 21B, negative insulating core wire; 211, twisted conductor; 212, insulating layer; 30, sheath layer; 40, KX type thermocouple cable group; 50, TX type thermocouple cable group; 60, outer sheath. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] Embodiment 1

[0030] Reference Figure 1 As shown, the utility model provides a bending-resistant thermocouple cable, comprising:

[0031] The cable core 20 comprises at least two twisted insulated core wires 21; the insulated core wires 21 comprise a multi-twisted conductor 211 and an insulating layer 212; the multi-twisted conductor 211 comprises at least three groups of mutually twisted bundle strands; at any cross section of the multi-twisted conductor 211, at least three groups of bundle strands are arranged in a circular array along the circumferential direction of the multi-twisted conductor 211; the insulating layer 212 is coated on the outside of the multi-twisted conductor 211; the bundle strands are formed by twisting a plurality of monofilaments with a diameter of 0.08 mm;

[0032] The sheath layer 30 is coated on the outside of the cable core 20 .

[0033] Specifically, the cable core 20 is the core part of the thermocouple cable, which includes at least two twisted insulated core wires 21 (usually corresponding to at least one positive insulated core wire 21A and one negative insulated core wire 21B), each insulated core wire 21 is composed of a double-twisted conductor 211 and an insulating layer 212, wherein the double-twisted conductor 211 is composed of at least three mutually twisted bundles of twisted wires, and the above-mentioned twisted structure can significantly improve the flexibility and bending resistance of the conductor; and on any cross-section of the double-twisted conductor 211, the twisting method in which the bundles of twisted wires are arranged in a circular array along the circumferential direction of the double-twisted conductor 211 can ensure that when the cable is bent, the stress can be evenly distributed in each bundle of twisted wires. The wire is twisted to prevent breakage caused by stress concentration; for the bundled stranded wire, it is formed by twisting several single wires with smaller diameters, and the specific diameter of the single wire is Ф0.08mm; compared with the single wire diameter range of Ф0.2mm~Ф1.76mm for the existing thermocouple compensation wire in the GB / T4989 standard, the bundled stranded wire formed by twisting Ф0.08mm single wires in the present application has better bending resistance; in a specific embodiment, the preparation method of the single wire is: using a diamond drawing die and increasing the drawing passes and adjusting the annealing process to achieve unbroken wire drawing of Ф0.08mm single wire, thereby providing a basis for the subsequent production and preparation of thermocouple cables.

[0034] In addition, the insulating layer 212 coated on the outside of the twisted conductor 211 mainly plays the role of electrical insulation and preventing current leakage. In some embodiments, the insulating layer 212 can be made of polytetrafluoroethylene propylene (FEP) material, which has good electrical insulation performance, high temperature resistance and chemical stability, and can ensure that the cable can operate stably for a long time under high-intensity environment. The sheath layer 30 coated on the outside of the cable core 20 plays a protective role for the entire cable; in some embodiments, the sheath layer 30 is made of ethylene propylene rubber elastomer, which has the advantages of low hardness, high elasticity and wear resistance, and can significantly improve the anti-bending times of the thermocouple cable; in summary, the technical solution of the anti-bending thermocouple proposed by the utility model can meet the requirements of a bending movement life of not less than 20 million times in 10 years under the conditions of a bending radius R≤90mm, a movement speed of 1m / s and an acceleration of 2g / s, thereby solving the problem that the existing thermocouple cable is easily damaged in an environment of frequent bending, and is particularly suitable for new chip screening machines and other equipment that have extremely high requirements for cable anti-bending performance.

[0035] In a specific embodiment, at least two of the insulating core wires 21 include a positive insulating core wire 21A and a negative insulating core wire 21B, and the twisting pitch of the positive insulating core wire 21A and the negative insulating core wire 21B is 8D-12D. The twisting pitch of the bundle of strands is 5D-7D. Wherein, D represents the diameter of the core wire, the twisting pitch of the positive insulating core wire 21A and the negative insulating core wire 21B is set to 8-12 times the diameter of the insulating core wire 21, and the twisting pitch of the bundle of strands is set to 5-7 times the diameter of the bundle of strands. The above design aims to achieve a balance between flexibility and mechanical strength, thereby comprehensively improving the bending resistance of the cable.

[0036] Reference Figure 1 As shown, the multi-twisted conductor 211 is formed by twisting three groups of stranded wires. On any cross section of the multi-twisted conductor 211, the three groups of stranded wires are arranged in an equilateral triangle, so that the single wires in the stranded wires are relatively balanced in force from any direction during cable operation, thereby improving the bending resistance of the multi-twisted conductor 211 in the cable.

[0037] Embodiment 2

[0038] Reference Figure 1-2 As shown, a tube-shaped flat cable includes a bending-resistant thermocouple cable as described in any one of the items.

[0039] In some embodiments, the flat cable includes:

[0040] One or more KX-type thermocouple cable groups 40, wherein the KX-type thermocouple cable group 40 includes at least two first anti-bending thermocouple cables;

[0041] One or more TX type thermocouple cable groups 50, wherein the TX type thermocouple cable group 50 includes a plurality of second anti-bending thermocouple cables;

[0042] The outer sheath 60 covers the outer sides of the KX type thermocouple cable group 40 and the TX type thermocouple cable group 50 .

[0043] In a specific embodiment, the KX type thermocouple cable group 40 is set as one group, each group includes two first anti-bending thermocouple cables, and the TX type thermocouple cable group 50 is set as two groups, each group includes four second anti-bending thermocouple cables; the first anti-bending thermocouple cable and / or the second anti-bending thermocouple cable can be constructed using the design in the first embodiment. Therefore, there are 2 KX type first anti-bending thermocouple cables and 8 TX type thermocouple cables in the flat cable of this embodiment, and the cross section of the cable core 20 remains consistent and neat.

[0044] On this basis, in the first anti-bending thermocouple cable, the single wire in the positive insulated core wire 21A is made of nickel-chromium alloy material, and the single wire in the negative insulated core wire 21B is made of nickel-silicon alloy material; in the second anti-bending thermocouple cable, the single wire in the positive insulated core wire 21A is made of copper, and the single wire in the negative insulated core wire 21B is made of copper-nickel alloy material. The outer sheath 60 is made of polyether polyurethane, which has good anti-bending, wear resistance and oil resistance.

[0045] Embodiment 3

[0046] In this embodiment, the parameter settings and performance indicators of the bending-resistant thermocouple cable and the flat cable are as follows:

[0047] The diameter of the single wire is Ф0.08mm. The number of single wires is calculated according to the diameter of the twisted conductor 211, and then the single wire is divided into three strands, which are bundled and twisted separately, and the bundle twisting pitch is controlled at 5D-7D to form a bundle twisted wire; the three bundle twisted wires are twisted again to form a twisted conductor 211, and the cross-section of the twisted conductor 211 is an equilateral triangle after molding; the twisted conductor 211 is extruded with a polyperfluoroethylene propylene (FEP) insulation layer 212; the positive insulating core wire 21A and the negative insulating core wire 21B in the KX type and / or TX type are twisted, and the twisting pitch is controlled at 8D-12D. The cable core 20 after twisting is extruded with a low-hardness, high-elasticity ethylene-propylene rubber elastomer, thereby respectively making a first anti-bending thermocouple cable and a second anti-bending thermocouple cable.

[0048] In the flat cable, the two KX type first anti-bending thermocouple cables and eight TX type second anti-bending thermocouple cables are coated with a polyether polyurethane (PU) outer sheath 60 to form 10 pairs of anti-bending thermocouple compensation wire flat cables for intelligent manufacturing, wherein each twisted conductor 211 is composed of 42 single wires; in the first anti-bending thermocouple cable, the twisted conductor 211 of the positive insulating core wire 21A is composed of 42 Ф0.08mm nickel-chromium 10 single wires, and the twisted conductor 211 of the negative insulating core wire 21B is composed of 42 It is composed of Ф0.08mm nickel-silicon 3 single wires; in the second bend-resistant thermocouple cable, the twisted conductor 211 of the positive insulating core wire 21A is composed of 42 Ф0.08mm copper single wires, and the twisted conductor 211 of the negative insulating core wire 21B is composed of 42 Ф0.08mm copper-nickel 42 single wires; specifically, the 42 single wires in the twisted conductor 211 are divided into 3 strands, each strand has 14 Ф0.08mm strands, the 14 / 0.08 bundle has a twist pitch of 2.4mm, and an outer diameter of 0.34mm; the 3 strands (14 / 0.08) have a twist pitch of 7mm and an outer diameter of 0.70mm.

[0049] The specifications of the tube flat cable are:

[0050] YDPGBFU 8CxTX-HS-42 / 0.08+2CxKX-HS-42 / 0.08. The cable width of 29mm meets the requirement of ≤32mm, the stacking thickness of 3.9mm meets the requirement of ≤4mm, the insulated core wire 21 has no twitching, the outer sheath 60 arc is excessive, the cable is soft, and the row height is flat. The finished cable (bending radius R≤90mm, meeting the movement speed of 1m / s, acceleration of 2g / s) can pass 20 million bending tests. Cable operating temperature: 200℃, rated voltage: 600V.

[0051] The GB / T4990 standard requires that the range of thermoelectric potential and tolerance (μV) of the KX and TX thermocouple conductors when the positive and negative poles of the cable are paired are: KX: (100℃, 4096±44), KX: (200℃, 8138±44); TX: (100℃, 4279±48), TX: (200℃, 9288±48). The actual test results of the range of thermoelectric potential and tolerance (μV) of the KX and TX thermocouple conductors when the positive and negative poles of the cable are paired are: KX: (100℃, 4052), KX: (200℃, 8143); TX: (100℃, 4297), TX: (200℃, 9290), which fully meets the requirements of the GB / T4990 standard.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A bending-resistant thermocouple cable, characterized in that: include: A cable core (20), comprising at least two twisted insulating core wires (21); the insulating core wire (21) comprises a multi-twisted conductor (211) and an insulating layer (212); the multi-twisted conductor (211) comprises at least three groups of mutually twisted bundles of strands; at any cross section of the multi-twisted conductor (211), at least three groups of the bundles of strands are arranged in a circular array along the circumferential direction of the multi-twisted conductor (211); the insulating layer (212) covers the outside of the multi-twisted conductor (211); the bundles of strands are formed by twisting a plurality of single wires with a diameter of 0.08 mm; A sheath layer (30) is coated on the outside of the cable core (20).

2. The bending-resistant thermocouple cable according to claim 1, characterized in that: At least two of the insulating core wires (21) include a positive insulating core wire (21A) and a negative insulating core wire (21B), and the twisting pitch of the positive insulating core wire (21A) and the negative insulating core wire (21B) is 8D-12D.

3. The bending-resistant thermocouple cable according to claim 1, characterized in that: The stranding pitch of the bundle of stranded wires is 5D-7D.

4. The bending-resistant thermocouple cable according to claim 1, characterized in that: The multi-twisted conductor (211) is formed by twisting three groups of stranded wires together, and on any cross section of the multi-twisted conductor (211), the three groups of stranded wires are arranged in an equilateral triangle.

5. The bending-resistant thermocouple cable according to claim 1, characterized in that: The insulating layer (212) is made of poly(fluoroethylene propylene) material.

6. The bending-resistant thermocouple cable according to claim 1, characterized in that: The sheath layer (30) is made of ethylene propylene rubber elastomer.

7. A tube-type flat cable, characterized in that: It comprises a bending-resistant thermocouple cable as described in any one of claims 1 to 6.

8. The tube-shaped flat cable according to claim 7, characterized in that: include: One or more KX-type thermocouple cable groups (40), wherein the KX-type thermocouple cable group (40) comprises at least two first anti-bending thermocouple cables; One or more TX-type thermocouple cable groups (50), wherein the TX-type thermocouple cable group (50) comprises a plurality of second anti-bending thermocouple cables; An outer sheath (60) covers the outer sides of the KX-type thermocouple cable group (40) and the TX-type thermocouple cable group (50).

9. The tube-shaped flat cable according to claim 8, characterized in that: In the first anti-bending thermocouple cable, the single wire in the positive insulating core wire (21A) is made of a nickel-chromium alloy material, and the single wire in the negative insulating core wire (21B) is made of a nickel-silicon alloy material; in the second anti-bending thermocouple cable, the single wire in the positive insulating core wire (21A) is made of copper, and the single wire in the negative insulating core wire (21B) is made of a copper-nickel alloy material.

10. The tube-shaped flat cable according to claim 8, characterized in that: The outer sheath (60) is made of polyether polyurethane.

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