High-shielding-performance low-heat-release fireproof computer and instrument shielding cable

Abstract

The invention discloses a fireproof computer and instrument shielding cable with high shielding performance and low heat release, and relates to the technical field of cables, the fireproof computer and instrument shielding cable comprises four conductors, the outer surface wall of each conductor is wrapped with a fireproof layer, the outer surface wall of each fireproof layer is wrapped with an insulating layer, the outer surface walls of every two insulating layers are wrapped with a wire group wrapping tape layer, and the wire group wrapping tape layer is wrapped with a wire group wrapping tape layer. The outer surface wall of each wire group belting layer is wrapped and woven with a sub-shielding layer, a fireproof layer and an insulating layer are adopted in the mechanism, an effective protection effect on a conductor is achieved, meanwhile, the fireproof performance of the cable body is improved, the content of limited substances in the cable is reduced, the environmental protection performance of the cable body is improved, and through the arrangement of the sub-shielding layers, the service life of the cable is prolonged. The shielding capability of the cable body is improved, the stability of signal transmission is ensured, the cable core filling layer and the cable core belting layer are arranged, the environmental protection performance is further improved, the flame retardation capability is improved, the combustion and flame spreading of the cable body can be significantly inhibited, the processing performance is good, and the cost performance is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to a fire-resistant computer and instrument shielded cable with high shielding performance and low heat release. Background Art

[0002] Cable is a device for transmitting electric energy or signals, usually composed of several or several groups of wires. Computer and instrument shielded cables are widely used in electronic computer systems, monitoring circuits, signal transmission of automatic control systems and connection of detection instruments and meters in power generation, metallurgy, petroleum, chemical industry, textile, etc.

[0003] Existing shielded cables are usually made of a combination of multiple materials when in use, and a layered coating method is used to ensure the anti-interference ability and safety of the shielded cable itself. At the same time, the shielded cable itself has excellent corrosion resistance and a long service life.

[0004] However, the existing high shielding performance, low heat release, fire-resistant computer and instrument shielded cables have the following shortcomings: 1) The phlogopite tape used in the fire-resistant layer of existing computer and instrument shielded cables is prone to delamination and filamentation, which not only affects the wrapping production of the fire-resistant layer of the product, but also affects the fire-resistant performance of the product; 2) The high-density polyethylene insulation used in existing computer and instrument shielded cables contains high levels of heavy metals, organic bromides and phthalates, which are harmful to humans and the environment. 3) The existing computer and instrument shielded cables have poor internal support structures, which can easily affect the overall toughness of the cables, leading to cable breakage or circuit fluctuations due to bending. In addition, the internal heat is relatively concentrated and the dissipation speed is slow, which can easily affect the heat dissipation efficiency and damage the service life of the cables, making it difficult to meet actual usage requirements.

[0005] Therefore, we propose a high shielding performance, low heat release, fire-resistant computer and instrument shielded cable to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a high-shielding performance, low-heat release, fire-resistant computer and instrument shielded cable. By setting a fire-resistant layer and an insulating layer, the fire resistance of the cable body is improved, while the content of restricted substances is reduced, the hazards of the cable body are reduced, and the environmental protection performance is improved, so as to solve the problems raised by the above-mentioned background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-shielding performance, low-heat-release, fire-resistant computer and instrument shielded cable, comprising four conductors, the outer wall of each conductor is wrapped with a fire-resistant layer, the outer wall of each fire-resistant layer is covered with an insulating layer, the outer walls of every two insulating layers are wrapped with a wire group tape layer, the outer wall of each wire group tape layer is wrapped and woven with a sub-shielding layer, the outer wall of each sub-shielding layer is wrapped with a sub-shielding tape layer, the outer sides of the two sub-shielding tape layers are filled with a cable core filling layer, and the outer side of the cable core filling layer is wrapped with a cable core tape layer.

[0008] Preferably, two groups of limit frames are symmetrically arranged on the inner surface wall of the cable core tape layer, and inner sides of the two groups of limit frames are clamped with inner support and ventilation mechanisms, and multiple shock-absorbing and rebound mechanisms are fixedly installed on the outer sides of both ends of the inner support and ventilation mechanisms; The inner support and ventilation mechanism includes a partition plate, which is arranged between two sub-shielding layers. The top and bottom of the partition plate are fixedly connected with arc strips, and each of the arc strips is respectively clamped in a corresponding group of limit frames. Two support frames are symmetrically arranged on both sides of the partition plate, and each of the support frames is attached to the outer wall of the sub-shielding wrapping layer. A plurality of first ventilation holes are penetrated through the top of each support frame, and a plurality of second ventilation holes are penetrated through one side of the partition plate. A trapezoidal block is arranged on the surface of each support frame, and a limit bracket is fixedly installed on the surface of each support frame.

[0009] Preferably, the shock-absorbing rebound mechanism includes three dampers, each of the three dampers is fixedly mounted on a corresponding trapezoidal block, a shock-absorbing spring is sleeved on the outer side of each damper, and one end of each of the three dampers is connected to an arc block, and the arc blocks are respectively attached to the outer side of the limit bracket and the inner surface wall of the cable core wrap layer.

[0010] Preferably, the outer surface wall of the cable core tape layer is wrapped and woven with a total shielding layer, and the outer surface wall of the total shielding layer is coated with an isolation sleeve layer.

[0011] Preferably, the outer wall of the isolation sleeve layer is wrapped with an armor layer, and the outer wall of the armor layer is wrapped with an armor tape layer.

[0012] Preferably, the outer surface wall of the armor tape layer is covered with an outer sheath layer, and the outer surface wall of the outer sheath layer is provided with a plurality of anti-slip stems.

[0013] Preferably, fixing frames are symmetrically arranged at both ends of the surface of each support frame, and a plurality of elastic core belts are fixedly connected between every two fixing frames.

[0014] Preferably, the outer wall of the outer sheath layer is coated with an anti-puncture layer, and a plurality of slots are penetrated through the outer wall of the anti-puncture layer, and each of the anti-slip stems is respectively arranged inside a corresponding through slot.

[0015] Preferably, the outer sheath layer is composed of a surface sheath layer and an inner sheath layer, a plurality of flame retardant cavities are equidistantly provided inside the outer sheath layer, and each of the flame retardant cavities is filled with flame retardant powder.

[0016] Preferably, a flame retardant column is disposed inside each of the flame retardant cavities, and the diameter of the flame retardant column is always smaller than the inner diameter of the flame retardant cavity.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides an effective protection for the conductor by arranging a fire-resistant layer and an insulating layer, while improving the fire resistance of the cable body, reducing the content of restricted substances in the cable, and improving the environmental protection performance of the cable body. By arranging a sub-shielding layer, the shielding ability of the cable body is improved to ensure the stability of signal transmission. By arranging a cable core filling layer and a cable core wrapping layer, the environmental protection performance is further improved, the flame retardant ability is improved, and the combustion and flame spread of the cable body can be significantly suppressed. At the same time, the processing performance is good and it has a higher cost performance.

[0018] 2. The present invention provides an internal support and ventilation mechanism to provide good support for the cable body from the inside, thereby improving the overall toughness of the cable and preventing the cable from breaking due to bending. At the same time, it ensures the heat flow inside the cable, dissipates the heat, and can dissipate the heat outward faster, so as to reduce the internal temperature of the cable and extend the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a main structural stereogram of a high-shielding-performance, low-heat-release, fire-resistant computer and instrument shielded cable of the present invention; Figure 2 A schematic cross-sectional view of a fire-resistant computer and instrument shielded cable with high shielding performance and low heat release according to the present invention; Figure 3 A cross-sectional structural stereogram of a high-shielding-performance, low-heat-release, fire-resistant computer and instrument shielded cable of the present invention; Figure 4 A three-dimensional diagram of the local structure of a high-shielding-performance, low-heat-release, fire-resistant computer and instrument shielded cable of the present invention; Figure 5 A schematic diagram of the cross section of a conductor in a fire-resistant computer and instrument shielded cable with high shielding performance and low heat release according to the present invention; Figure 6 It is an enlarged stereoscopic diagram of a part of the structure of a high-shielding performance, low-heat-release, fire-resistant computer and instrument shielded cable of the present invention; Figure 7 It is an enlarged stereoscopic view of the inner support and ventilation mechanism in a high-shielding performance, low-heat-release, fire-resistant computer and instrument shielded cable of the present invention; Figure 8 This is an enlarged stereoscopic diagram of a shock-absorbing and rebounding mechanism of a high-shielding-performance, low-heat-release, fire-resistant computer and instrument shielded cable of the present invention; Fig. 9 This is a partially cutaway enlarged stereoscopic view of a fire-resistant computer and instrument shielded cable with high shielding performance and low heat release according to the present invention.

[0020] In the figure: 1. conductor; 2. fire-resistant layer; 3. insulation layer; 4. wire group tape layer; 5. sub-shielding layer; 6. sub-shielding tape layer; 7. cable core filling layer; 8. cable core tape layer; 9. overall shielding layer; 10. isolation sleeve layer; 11. armor layer; 12. armor tape layer; 13. outer sheath layer; 14. anti-slip stem; 15. limit frame; 16. inner support and ventilation mechanism; 1601, partition plate; 1602, Arc strip; 1603, support frame; 1604, first air vent; 1605, second air vent; 1606, trapezoidal block; 1607, limit bracket; 17, shock-absorbing rebound mechanism; 1701, damper; 1702, shock-absorbing spring; 1703, arc block; 18, fixing frame; 19, elastic core belt; 20, anti-puncture layer; 21, flame-retardant cavity; 22, flame-retardant powder; 23, flame-retardant column. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] Please see attached Figure 1 -Attached Fig. 9As shown, the present invention provides a technical solution: a high-shielding performance, low-heat-release, fire-resistant computer and instrument shielded cable, comprising four conductors 1, the outer wall of each conductor 1 is wrapped with a fire-resistant layer 2, the outer wall of each fire-resistant layer 2 is covered with an insulating layer 3, the outer walls of every two insulating layers 3 are wrapped with a wire group tape layer 4, the outer wall of each wire group tape layer 4 is wrapped and woven with a sub-shielding layer 5, the outer wall of each sub-shielding layer 5 is wrapped with a sub-shielding tape layer 6, the outer sides of the two sub-shielding tape layers 6 are filled with a cable core filling layer 7, the outer side of the cable core filling layer 7 is wrapped with a cable core tape layer 8, by providing a conductor 1, the conductor 1 is mainly made of oxygen-free copper with a copper content of not less than 99.99%, and the oxygen-free copper is The oxygen content is extremely low, so it has higher electrical conductivity and thermal conductivity, as well as better corrosion resistance and processing performance. By providing a fire-resistant layer 2, the fire-resistant layer 2 mainly adopts an overlapping and wrapped layer of paper-coated reinforced mica tape, and the overlap rate of the paper-coated reinforced mica tape is not less than 20%, which effectively improves the fire resistance of the cable body. By providing an insulating layer 3, the insulating layer 3 mainly adopts environmentally friendly high-density polyethylene insulating material to reduce the content of restricted substances in the cable body and improve the environmental protection performance of the cable. By providing a sub-shielding layer 5, the sub-shielding layer 5 mainly adopts a composite form of aluminum-plastic composite tape wrapped shielding and tinned copper wire braided shielding. Under the single shielding form, the copper wire braided shield has the best shielding performance, but it has poor performance in high-frequency electromagnetic interference. The aluminum-plastic composite tape has a good effect of reducing the transfer impedance under interference, so a layer of aluminum-plastic composite tape is wrapped inside the braided shielding to prevent electromagnetic leakage caused by small holes in the braiding under high-frequency electromagnetic interference, and the aluminum-plastic composite tape has good flexibility. The composite shielding form can increase the absorption and reflection times of electromagnetic waves, further attenuate the electromagnetic waves, and ensure the stability of signal transmission; after the copper wire is tinned, the potential difference between tin and aluminum is small, which can effectively prevent the electrochemical corrosion problem of the aluminum-plastic composite tape. At the same time, the strength, oxidation resistance and corrosion resistance of the copper wire can be improved after tinning, and the shielding ability of the cable body is further improved. By arranging a cable core filling layer 7 and a cable core wrapping tape layer 8, the cable core filling layer 7 is mainly made of halogen-free, low-smoke, flame-retardant PP filling rope material, which is not It contains harmful substances such as glass fiber, asbestos, halogen, etc., meets ROHS testing standards, has good flame retardancy, is soft and smooth, has low smoke density, and has densely filled cable cores, which can further reduce the heat conduction rate and reduce the impact of high temperature on the insulating core. The cable core tape layer 8 mainly adopts an overlapping wrapping layer of polyester tape plus two layers of halogen-free low-smoke high flame retardant tape. The minimum overlap rate of polyester tape and halogen-free low-smoke high flame retardant tape is not less than 20%. The warp and weft yarns of the low-smoke halogen-free high flame retardant tape are made of a base cloth woven from glass fiber yarn, which is then coated and dried. The oxygen index of the low-smoke halogen-free high flame retardant tape is close to 100%, which further improves the environmental protection performance and the flame retardant ability of the cable body, and can significantly inhibit the combustion and flame spread of the cable body.

[0023] according to Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 and Fig. 9 As shown, two groups of limit frames 15 are symmetrically arranged on the inner surface wall of the cable core tape layer 8, and inner support and ventilation mechanisms 16 are clamped on the inner sides of the two groups of limit frames 15, and multiple shock-absorbing and rebound mechanisms 17 are fixedly installed on the outer sides of both ends of the inner support and ventilation mechanisms 16; The inner support ventilation mechanism 16 includes a partition plate 1601, which is arranged between two sub-shielding layers 5. The top and bottom of the partition plate 1601 are fixedly connected with arc strips 1602, and each arc strip 1602 is respectively clamped in a corresponding group of limit frames 15. Two support frames 1603 are symmetrically arranged on both sides of the partition plate 1601, and each support frame 1603 is attached to the outer wall of the sub-shielding wrapping layer 6. A plurality of first ventilation holes 1604 are penetrated on the top of each support frame 1603, and a plurality of second ventilation holes 1605 are penetrated on one side of the partition plate 1601. A trapezoidal block 1606 is arranged on the surface of each support frame 1603, and a limit bracket 1607 is fixedly installed on the surface of each support frame 1603. The setting of the supporting and ventilating mechanism 16 utilizes the partition plate 1601 to separate the two sub-shielding tape layers 6, and utilizes the arc strip 1602 to cooperate therewith to provide a stable internal supporting force for the cable body. Through the setting of the support frame 1603, on the basis of the support of the arc strip 1602, the stability of the internal support is further improved. At the same time, the first air hole 1604 and the second air hole 1605 are utilized to ensure the flow of heat inside the cable body, so that it can dissipate outward faster, thereby improving the heat dissipation capacity of the cable and extending the service life of the cable. Through the setting of the trapezoidal block 1606 and the limiting bracket 1607, a limiting effect can be provided for the shock-absorbing and rebounding mechanism 17 to prevent excessive bending from causing dislocation of the shock-absorbing and rebounding mechanism 17, thereby improving the stability of the cable body during use.

[0024] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the shock-absorbing and rebounding mechanism 17 includes three dampers 1701, each of which is fixedly mounted on a corresponding trapezoidal block 1606, and a shock-absorbing spring 1702 is sleeved on the outer side of each damper 1701. One end of each of the three dampers 1701 is connected to an arc block 1703, and the arc block 1703 is respectively attached to the outer side of the limiting bracket 1607 and the inner surface wall of the cable core tape layer 8. Through the setting of the shock-absorbing and rebounding mechanism 17, the dampers 1701, the shock-absorbing springs 1702 and the arc block 1703 cooperate with each other, so that when the cable body is subjected to external impact or vibration, the force can be absorbed and reduced, thereby maintaining the cable body from being affected by the vibration. At the same time, the elasticity of the shock-absorbing springs 1702 can be used to slowly restore the squeezed cable body to its original state, thereby extending the service life of the cable.

[0025] according to Figure 4 and Figure 6 As shown, the outer wall of the cable core tape layer 8 is wrapped and woven with a total shielding layer 9, and the outer wall of the total shielding layer 9 is covered with an isolation sleeve layer 10. By providing the total shielding layer 9, the total shielding layer 9 mainly adopts a composite form of aluminum-plastic composite tape wrapped shielding and tinned copper wire braided shielding, which further improves the anti-interference ability and ensures the smoothness of the circuit. By providing the isolation sleeve layer 10, the isolation sleeve layer 10 mainly adopts ceramic polyolefin oxygen insulation layer material, which can improve the strength of the cable body and improve the isolation ability at the same time, preventing external factors from affecting or damaging the cable body.

[0026] according to Figure 6 As shown, the outer wall of the isolation sleeve 10 is wrapped with an armor layer 11, and the outer wall of the armor layer 11 is wrapped with an armor tape layer 12. By arranging the armor layer 11 and the armor tape layer 12, it mainly adopts two layers of overlapping double-sided ceramic silicone rubber composite tapes, and the minimum overlap rate of the double-sided ceramic silicone rubber composite tapes is not less than 20%, thereby further improving the strength and tensile properties of the cable body and effectively extending the service life of the cable.

[0027] according to Figure 4 and Figure 6 As shown, the outer wall of the armor tape layer 12 is covered with an outer sheath layer 13, and the outer wall of the outer sheath layer 13 is provided with a plurality of anti-skid stems 14. By providing the outer sheath layer 13, the outer sheath layer 13 mainly adopts halogen-free, low-smoke, flame-retardant B1 grade polyolefin sheath material for low heat release cables, which can enhance the protection capability of the cable, prevent external adverse factors from damaging the cable body, and thus extend the service life of the cable. At the same time, the anti-skid stems 14 can be used to increase the friction force on the surface of the cable body, making the operation more convenient and stable, saving labor and time costs during use.

[0028] according to Figure 6 As shown, fixing frames 18 are symmetrically arranged at both ends of the surface of each support frame 1603, and a plurality of elastic core belts 19 are fixedly connected between every two fixing frames 18. Through the setting of the fixing frames 18 and the elastic core belts 19, the two cooperate with each other to provide strong toughness for the shielded cable body. At the same time, the elastic core belt 19 is mainly made of EPDM rubber, which has good elasticity and good flexibility of its molecular chain, so that the material can quickly restore its shape after being subjected to external force. This performance ensures the elastic deformation requirement of the cable during normal use, and has excellent fatigue resistance and tear resistance, so that it can maintain toughness during long-term use, thereby improving the toughness of the shielded cable body and giving it better elasticity and recovery performance.

[0029] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Fig. 9 As shown, the outer wall of the outer sheath layer 13 is coated with an anti-puncture layer 20, and the outer wall of the anti-puncture layer 20 is penetrated with a plurality of notches, and each of the anti-slip stems 14 is respectively arranged inside a corresponding through notch. By setting the anti-puncture layer 20, the protection capability of the shielded cable itself can be enhanced, and the cable's tolerance to puncture can be effectively improved. The anti-puncture layer 20 is mainly made of aramid fiber material, and its tensile strength can reach more than 3.6GPa, and its modulus is as high as 130GPa. Such high strength and high modulus make it have excellent puncture resistance. When a sharp object applies pressure to try to pierce the cable, the aramid fiber can effectively disperse the stress and prevent the puncture process, thereby playing an excellent protective role.

[0030] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Fig. 9 As shown, the outer sheath layer 13 is composed of a surface sheath layer and an inner sheath layer. A plurality of flame retardant cavities 21 are equidistantly provided inside the outer sheath layer 13. The interior of each flame retardant cavity 21 is filled with flame retardant powder 22. Through the arrangement of the flame retardant cavity 21 and the flame retardant powder 22, an explosion can occur inside the shielded cable or an external fire can be caused to block the combustion process. The flame retardant powder 22 mainly adopts DM95 glassy flame retardant powder, which can be transformed into a glassy state in a high temperature environment and remain stable without decomposition or volatilization. It has excellent flame retardant properties, insulation properties and high temperature resistance. It is an inorganic substance, does not contain heavy metals and free salts, and meets environmental protection requirements.

[0031] according to Figure 3 and Fig. 9 As shown, each of the flame retardant cavities 21 is provided with a flame retardant column 23, and the diameter of the flame retardant column 23 is always smaller than the inner diameter of the flame retardant cavity 21. By setting the flame retardant column 23, the strength of the shielded cable body can be further improved, and the flame retardant effect of the cable can be further enhanced. The flame retardant column 23 is mainly made of ceramic silicone rubber, which has unique properties. It has the softness, elasticity and insulation properties of silicone rubber at room temperature. When encountering extreme conditions such as fire, it can be quickly converted into a hard ceramic-like substance, continue to maintain good insulation properties and a certain mechanical strength, and play a role in heat insulation, flame retardancy and protection of the internal structure of the cable.

[0032] Working principle: First, every two conductors 1 and their external fire-resistant layer 2 and insulation layer 3 are combined into a complete cable core group using a single-group wire group wrapping layer 4, a sub-shielding layer 5 and a sub-shielding wrapping layer 6.

[0033] During the processing stage, the two cable core groups are placed side by side and are wrapped, woven and coated with a cable core tape layer 8, a total shielding layer 9, an isolation sleeve layer 10, an armor layer 11, an armor tape layer 12 and an outer sheath layer 13 to form a complete cable body. The cable core filling layer 7 is then filled into the cavity between the sub-shielding tape layer 6 and the cable core tape layer 8 to complete the cable body.

[0034] During the assembly phase, the inner support and ventilation mechanism 16 is inserted into the cable core tape layer 8 along the limiting frame 15, and the arc block 1703 is attached to the inner surface wall of the cable core tape layer 8, so as to provide a stable support force for the cable body from the inside.

[0035] During the use phase, the operator can increase the friction between the cable body and the palm by grasping the anti-slip stem 14 of the cable body to prevent the cable from falling off during laying. At the same time, when the cable is bent during use, the partition plate 1601, the arc strip 1602 and the support frame 1603 provide a multi-directional inner side for the cable body from the inside to prevent the cable from being deformed or shrunken and damaged. The elasticity of the elastic core belt 19 can be used to drive the cable body to slowly recover from the bent and deformed state to the initial state. When the shielded cable is exposed to external fire or internal When the outer sheath layer 13 is damaged due to high temperature burns, the flame retardant powder 22 in the flame retardant cavity 21 will leak out and transform into a glassy state due to high temperature. At the same time, the flame retardant column 23 will quickly transform into a ceramic-like substance due to the high temperature of combustion, thereby blocking the combustion process of the shielded cable body. Finally, when the two ends of the cable body are squeezed when connected, the damper 1701 and the shock-absorbing spring 1702 are used to absorb and reduce the pressure. At the same time, when the squeezing force is released, the shock-absorbing spring 1702 has the rebound characteristics to drive the cable body to slowly return to its original state.

[0036] Based on the above content, the use of high shielding performance, low heat release, fire-resistant computer and instrument shielded cables can be completed.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high shielding performance, low heat release, fire-resistant computer and instrument shielded cable, characterized by: The invention comprises four conductors (1), the outer wall of each conductor (1) is wrapped with a fire-resistant layer (2), the outer wall of each fire-resistant layer (2) is covered with an insulating layer (3), the outer walls of each of the two insulating layers (3) are wrapped with a wire group tape layer (4), the outer wall of each of the wire group tape layers (4) is wrapped with a sub-shielding layer (5), the outer wall of each of the sub-shielding layers (5) is wrapped with a sub-shielding tape layer (6), the outer sides of the two sub-shielding tape layers (6) are filled with a cable core filling layer (7), and the outer side of the cable core filling layer (7) is wrapped with a cable core tape layer (8).

2. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 1, characterized in that: Two groups of limit frames (15) are symmetrically arranged on the inner surface wall of the cable core tape layer (8), inner sides of the two groups of limit frames (15) are provided with inner support and ventilation mechanisms (16), and the outer sides of both ends of the inner support and ventilation mechanisms (16) are fixedly provided with a plurality of shock-absorbing and rebound mechanisms (17); The inner support ventilation mechanism (16) comprises a partition plate (1601), the partition plate (1601) is arranged between two sub-shielding layers (5), the top and bottom of the partition plate (1601) are fixedly connected with arc strips (1602), each of the arc strips (1602) is respectively clamped in a corresponding group of limit frames (15), two support frames (1603) are symmetrically arranged on both sides of the partition plate (1601), each of the support frames (1603) is attached to the outer wall of the sub-shielding wrapping layer (6), a plurality of first ventilation holes (1604) are penetrated through the top of each support frame (1603), a plurality of second ventilation holes (1605) are penetrated through one side of the partition plate (1601), a trapezoidal block (1606) is arranged on the surface of each support frame (1603), and a limit bracket (1607) is fixedly installed on the surface of each support frame (1603).

3. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 2, characterized in that: The shock-absorbing rebound mechanism (17) comprises three dampers (1701), each of the three dampers (1701) is fixedly mounted on a corresponding trapezoidal block (1606), a shock-absorbing spring (1702) is sleeved on the outer side of each damper (1701), one end of each of the three dampers (1701) is connected to an arc block (1703), and the arc block (1703) is respectively attached to the outer side of a limiting bracket (1607) and the inner surface wall of the cable core tape layer (8).

4. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 3 is characterized by: The outer surface wall of the cable core tape layer (8) is woven with a total shielding layer (9), and the outer surface wall of the total shielding layer (9) is covered with an isolation jacket layer (10).

5. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 4, characterized in that: The outer wall of the isolation sleeve layer (10) is wrapped with an armor layer (11), and the outer wall of the armor layer (11) is wrapped with an armor tape layer (12).

6. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 5, characterized in that: The outer surface wall of the armor tape layer (12) is covered with an outer sheath layer (13), and the outer surface wall of the outer sheath layer (13) is provided with a plurality of anti-slip stems (14).

7. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 2, characterized in that: Fixing frames (18) are symmetrically arranged at both ends of the surface of each support frame (1603), and a plurality of elastic core bands (19) are fixedly connected between every two fixing frames (18).

8. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 6, characterized in that: The outer wall of the outer sheath layer (13) is coated with an anti-puncture layer (20), and a plurality of slots are provided through the outer wall of the anti-puncture layer (20), and each of the anti-slip stems (14) is arranged inside a corresponding through slot.

9. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 8, characterized in that: The outer sheath layer (13) is composed of a surface sheath layer and an inner sheath layer, and a plurality of flame retardant cavities (21) are equidistantly provided inside the outer sheath layer (13), and each of the flame retardant cavities (21) is filled with flame retardant powder (22).

10. The high shielding performance, low heat release, fire-resistant computer and instrument shielded cable according to claim 9, characterized in that: A flame retardant column (23) is arranged inside each of the flame retardant cavities (21), and the diameter of the flame retardant column (23) is always smaller than the inner diameter of the flame retardant cavity (21).

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