Fire resistant shielded control cable

Abstract

The application provides a fire-resistant shielding control cable, and relates to the technical field of control cables.The fire-resistant shielding control cable comprises a core wire and a filling layer, and the filling layer comprises a support and a filler.The support comprises a base plate and a support plate, and a plurality of support plates are arranged on one base plate.An intermediate piece and the filler are arranged between two adjacent support plates.The intermediate piece is connected to the support plate at one end and faces the adjacent support plate at the other end.When the fire-resistant shielding control cable is subjected to external force, the support is extruded, the support is elastic, and the filler reduces the speed and distance at which the two adjacent support plates approach each other, thereby improving the buffering performance of the filling layer.When the external force is large enough to cause the other end of the intermediate piece to abut against the adjacent support plate, the support forms a stable support structure and no longer deforms, thereby improving the compression resistance of the filling layer, avoiding compression of the filling layer to the limit and loss of effective buffering performance to some extent, avoiding direct transmission of external stress to the internal core wire, and ensuring the structural integrity and use reliability of the fire-resistant shielding control cable.

Description

Technical Field

[0001] This invention relates to the field of control cable technology, and in particular to a fire-resistant shielded control cable. Background Technology

[0002] In control systems and monitoring circuits, especially in densely populated large and medium-sized public places such as rail transit, airports, schools, hospitals, and commercial complexes where low smoke, environmental protection, and flame retardancy are required, fire-resistant shielded control cables are widely used to ensure stable power and signal transmission between electrical equipment and safety in case of fire. Existing fire-resistant shielded control cables typically adopt a multi-layer structure design, including, from the inside out, a core wire, a fire-resistant layer, an insulation layer, a filler layer, a wrapping layer, a shielding layer, an isolation layer, an armor layer, and a sheath layer. Each layer works together to achieve the functions of signal transmission, electromagnetic shielding, mechanical protection, and maintaining line integrity at high temperatures.

[0003] While the existing fire-resistant shielded control cable's filler layer can provide a certain degree of flexibility and buffer protection, its compressive strength is limited. When the cable is subjected to a large external force, the filler layer is easily compressed to its limit and loses its effective buffering performance, causing external stress to be directly transmitted to the internal core, affecting the cable's structural integrity and reliability.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a fire-resistant shielded control cable to address the problems existing in current fire-resistant shielded control cables.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A fire-resistant shielded control cable includes, from the inside out, core wires, a filling layer, and a wrapping layer. At least two core wires are provided. The filling layer includes supports and filler material, both made of elastic material. The number of supports is equal to the number of core wires, and the supports are located between the core wires and the wrapping layer. Each support includes two arc-shaped base plates and multiple support plates. The two base plates are coaxial with two adjacent core wires, and the inner diameter of each base plate is equal to the diameter of the core wire. Multiple support plates are spaced along the arc-shaped trajectory of one base plate, and each support plate is coaxial with the other base plate. An intermediate member and the filler material are provided between two adjacent support plates. One end of the intermediate member is connected to a support plate, and the other end is a free end facing the adjacent support plate. When the fire-resistant shielded control cable is subjected to external force, the support is compressed, and the two adjacent support plates move closer together. The other end of the intermediate member gradually approaches and abuts against the adjacent support plate.

[0008] Furthermore, the intermediate component is plate-shaped, and multiple intermediate components are evenly spaced along the arc trajectory of the support plate between two adjacent support plates, and the filler is disposed between two adjacent intermediate components.

[0009] Furthermore, one end of each of the two adjacent intermediate members located between two adjacent support plates is connected to the two adjacent support plates respectively.

[0010] Furthermore, the intermediate component is arc-shaped and coaxial with one of the substrates, and the distance between two adjacent support plates is equal to the distance between two adjacent intermediate components.

[0011] Furthermore, multiple filler layers are evenly spaced along the length of the fire-resistant shielded control cable, and there is a cutting position between two adjacent filler layers; the support plate has a first end and a second end, the first end is connected to one of the substrates, and the second end is bent to form a clamping plate, and two adjacent clamping plates can be interlocked with each other.

[0012] Furthermore, the card plate is arranged circumferentially along the fire-resistant shielded control cable. A slot is formed from the outside to the inside at the end of the card plate near the support plate, and a head is formed at the end of the card plate away from the support plate. Before and after the wrapping layer is set, the card plate has a first state and a second state respectively. In the first state, the head disengages from the slot of the adjacent card plate so that the two adjacent card plates form an opening. In the second state, the head is inserted into the slot of the adjacent card plate along the circumferential direction of the fire-resistant shielded control cable.

[0013] Furthermore, the card slot and the card head are both V-shaped and mutually compatible, and the card plate is symmetrically arranged about the first plane, which is perpendicular to the length direction of the fire-resistant shielded control cable.

[0014] Furthermore, a plurality of connecting wires are provided between two adjacent filling layers, and the ends of the connecting wires are connected to the support plate.

[0015] Furthermore, a shielding layer is provided outside the wrapping layer. The shielding layer has a spiral braided structure and gaps. When the card plate is in the second state, the card head protrudes from the outer surface of the adjacent card plate, and the card head causes the wrapping layer to produce a first protrusion, which can be inserted into the gap.

[0016] Furthermore, the outer surface of the card plate is curved. When the card plate is in the second state, the outer surface of the card plate causes the wrapping layer to produce a second protrusion, which can be inserted into the gap.

[0017] The present invention has at least the following beneficial effects:

[0018] (1) When the fire-resistant shielded control cable is subjected to external force, the bracket is squeezed and the two adjacent support plates approach each other. Since the bracket is elastic and the filler can reduce the speed and distance of the two adjacent support plates approaching each other, the buffer performance of the filler layer is improved together. When the external force is large enough that the other end of the intermediate part abuts against the adjacent support plate, the bracket forms a stable support structure and no longer deforms, thereby improving the compressive strength of the filler layer. To a certain extent, the filler layer is prevented from being compressed to the limit and losing its effective buffer performance, and external stress is prevented from being directly transmitted to the internal core, thereby ensuring the structural integrity and reliability of the fire-resistant shielded control cable.

[0019] (2) The filling layer is divided into multiple continuous sections with gaps between adjacent filling layers to form a cutting position. The cutting position is cut directly with a cutter to facilitate the quick cutting of the fire-resistant shielded control cable. In addition, both sides of the cutting position are supported and buffered by the elastic filling layer. The snap-fit ​​structure of the clamping plate can further enhance the support of the filling layer and snap-fit ​​limit the filling layer, thereby reducing the displacement of the filling layer during cutting, making it easier to be cut quickly. The cut surface is relatively neat, reducing the cutting debris and reducing the impact on the connection and contact of other layers.

[0020] (3) When the clamping head is inserted into the slot of the adjacent clamping plate, it can prevent the two adjacent clamping plates from moving along the length of the fire-resistant shielded control cable, and prevent the filling layer from deforming along the length of the fire-resistant shielded control cable. At the same time, due to the wrapping effect of the wrapping layer, it can prevent the two adjacent clamping plates from moving along the circumference of the fire-resistant shielded control cable, and cooperate with the bracket to improve the compressive strength of the filling layer in the circumference and radial direction of the fire-resistant shielded control cable, thereby realizing the clamping and limiting of the filling layer.

[0021] (4) Under the action of the wrapping layer, the clip protrudes from the outer surface of the adjacent clip plate and causes the wrapping layer to produce a first protrusion. The outer surface of the clip plate causes the wrapping layer to produce a second protrusion. Both the first and second protrusions can be inserted into the corresponding gaps. Multiple first protrusions and multiple second protrusions form a concave-convex interlocking structure with the corresponding gaps to limit the shielding layer, which is conducive to the stability of the shielding layer. This reduces the displacement of the shielding layer during cutting, making it easier to be cut quickly. After cutting, the cross-section of the shielding layer is relatively neat, reducing the impact on the connection and contact of other layer structures and facilitating subsequent installation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a fire-resistant shielded control cable provided in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 for Figure 2 Schematic diagram of the middle filling layer;

[0025] Figure 4 for Figure 3 Top view of the middle fill layer;

[0026] Figure 5 for Figure 4 BB-direction sectional view;

[0027] Figure 6 for Figure 5 A magnified view of a section at point C.

[0028] in:

[0029] 101. Core wire;

[0030] 200. Filler layer; 201. Support; 202. Substrate; 203. Support plate; 204. Intermediate component; 205. Card plate; 206. Card slot; 207. Card head; 208. Connecting wire; 209. Shielding layer; 210. Gap;

[0031] 301. Wrapping layer; 302. Fire-resistant layer; 303. Insulation layer; 304. Isolation layer; 305. Armor layer; 306. Sheath layer. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] like Figures 1 to 6As shown, this embodiment of the invention provides a fire-resistant shielded control cable. The fire-resistant shielded control cable includes, from the inside out, core wires 101, a filling layer 200, and a wrapping layer 301. At least two core wires 101 are provided. The filling layer 200 includes supports 201 made of elastic material and filler (not shown). The number of supports 201 is equal to the number of core wires 101, and the supports 201 are located between the core wires 101 and the wrapping layer 301. The supports 201 include two arc-shaped base plates 202 and multiple support plates 203. The two base plates 202 are respectively held by two adjacent core wires 101. The substrate 202 is coaxial with the inner diameter of the core wire 101. Multiple support plates 203 are formed on one of the substrates 202 along its arc trajectory. The support plates 203 are coaxial with the other substrate 202. An intermediate member 204 and a filler are provided between two adjacent support plates 203. One end of the intermediate member 204 is connected to the support plate 203, and the other end is a free end facing the adjacent support plate 203. When the fire-resistant shielded control cable is subjected to external force, the support 201 is squeezed and the two adjacent support plates 203 move closer to each other. The other end of the intermediate member 204 gradually moves closer to and abuts against the adjacent support plate 203.

[0036] When the fire-resistant shielded control cable is subjected to external force, the bracket 201 is compressed and the two adjacent support plates 203 move closer to each other. Because the bracket 201 is elastic and the filler can reduce the speed and distance at which the two adjacent support plates 203 move closer to each other, the buffering performance of the filler layer 200 is improved together. When the external force is large enough that the other end of the intermediate piece 204 abuts against the adjacent support plate 203, the bracket 201 forms a stable support structure and no longer deforms, thereby improving the compressive strength of the filler layer 200. To a certain extent, this prevents the filler layer 200 from being compressed to its limit and losing its effective buffering performance, and prevents external stress from being directly transmitted to the internal core, thus ensuring the structural integrity and reliability of the fire-resistant shielded control cable.

[0037] The existing fire-resistant shielded control cable includes, from the inside out, a core wire 101, a fire-resistant layer 302, an insulation layer 303, a filling layer 200, a wrapping layer 301, a shielding layer 209, an isolation layer 304, an armor layer 305, and a sheath layer 306. Therefore, a fire-resistant layer 302 and an insulation layer 303 are also provided between the core wire 101 and the filling layer 200, and the fire-resistant layer 302 and the insulation layer 303 are wrapped around their respective core wires 101 from the inside out. Preferably, the core wire 101 is made of high-purity oxygen-free copper wire stranded together to ensure excellent transmission performance and flexibility; the fire-resistant layer 302 is made of high-performance fire-resistant material, which can extend the normal service life of the fire-resistant shielded control cable in the event of a fire; the insulation layer 303 is made of heat-resistant cross-linked polyethylene material, which has excellent insulation performance, mechanical strength and flame retardant properties; the wrapping layer 301 is made of mica tape wrapped around the conductor, which can form a strong insulating skeleton at high temperatures to ensure continuous transmission of power and signals within the fire resistance time specified by national standards; the shielding layer 209 is made of high-purity oxygen-free copper wire braided together to ensure excellent anti-interference ability; the isolation layer 304 is made of highly flame-retardant material to achieve oxygen isolation and cooling functions; the armor layer 305 is made of galvanized steel strip structure to enhance compressive strength; the sheath layer 306 is made of low-smoke halogen-free flame-retardant polyolefin material, which can greatly suppress the generation of toxic fumes and corrosive gases under fire conditions and has the characteristic of self-extinguishing after the fire is removed, improving the fire resistance and drop resistance of the fire-resistant shielded control cable. The materials and corresponding functions of the aforementioned multi-layer structure are all existing technologies and will not be elaborated here. In addition, the filling layer 200 includes a support 201 made of elastic material and a filler. The support 201 can be integrally molded and its material can be metal or high-strength plastic, etc. The filler is made of inorganic flame-retardant material (such as asbestos rope, fiberglass rope) or environmentally friendly non-hygroscopic material. It tightly wraps the core wire 101 to ensure the circumferential roundness of the fire-resistant shielded control cable and further improve the overall heat resistance and structural stability of the fire-resistant shielded control cable.

[0038] It is worth noting that there are at least two core wires 101 in this application. In practical applications, fire-resistant shielded control cables generally include various forms such as 3-core, 4-core, and 5-core cables. When the number of core wires 101 increases, the structure of the support 201 in this application can be appropriately adjusted for production and use. However, the support 201 is always located between the core wire 101 and the wrapping layer 301. Under the wrapping effect of the wrapping layer 301, the filler layer 200 has good buffering and compressive strength, ensuring the circumferential roundness of the fire-resistant shielded control cable. In addition, for fire-resistant shielded control cables with more than 3 cores, gaps are formed between the three core wires 101. Filler can be inserted during production to achieve a certain degree of buffering for the three core wires 101 even at the gaps.

[0039] In addition, the external force on a fire-resistant shielded control cable means that it is subjected to radial compressive force, or is bent, twisted, or stretched.

[0040] In one embodiment, the intermediate component 204 is plate-shaped, and multiple intermediate components 204 are evenly spaced along the arc trajectory of the support plate 203 between two adjacent support plates 203, with filler material disposed between two adjacent intermediate components 204.

[0041] The number of intermediate members 204 between adjacent support plates 203 increases. When a large external force causes the other end of the intermediate member 204 to abut against the adjacent support plate 203, the bracket 201 forms a more stable support structure to further improve the compressive strength of the filling layer 200. At the same time, there is filler between two adjacent intermediate members 204 to further improve the buffering performance of the filling layer 200.

[0042] In one embodiment, one end of two adjacent intermediate members 204 located between two adjacent support plates 203 is connected to the two adjacent support plates 203 respectively. In other words, one end of all intermediate members 204 between two adjacent support plates 203 is alternately connected to the two adjacent support plates 203, and the two adjacent intermediate members 204 form a cross structure. When the external force is large enough that the other end of the intermediate member 204 abuts against the adjacent support plate 203, the bracket 201 forms a more stable support structure to further improve the compressive strength of the filling layer 200.

[0043] For example, see Figure 3 and Figure 4 Two adjacent support plates 203 are respectively the first component and the second component. Multiple intermediate parts 204 are provided at equal intervals between them along their arc trajectory. Among these intermediate parts 204, one end of the first intermediate part 204 is connected to the first component and the other end faces the second component. One end of the second intermediate part 204 is connected to the second component and the other end faces the first component. This process is repeated in an alternating cycle, so that two adjacent intermediate parts 204 form a mutually intersecting structure.

[0044] It is worth noting that, since multiple support plates 203 are formed at equal intervals along the arc trajectory on one of the substrates 202, there is a support plate 203 adjacent to another substrate 202, and an intermediate member 204 is also provided between the support plate 203 and the other substrate 202. One end of the intermediate member 204 is connected to the support plate 203, and the other end faces the other substrate 202. When the cable is subjected to external force, the other end of the intermediate member 204 gradually approaches and abuts against the other substrate 202; or, one end of the intermediate member 204 is connected to the other substrate 202, and the other end faces the support plate 203. When the cable is subjected to external force, the other end of the intermediate member 204 gradually approaches and abuts against the support plate 203.

[0045] In one embodiment, the intermediate member 204 is arc-shaped and coaxial with one of the substrates 202, and the distance between two adjacent support plates 203 is equal to the distance between two adjacent intermediate members 204.

[0046] Two adjacent support plates 203 and two adjacent intermediate members 204 located between the two adjacent support plates 203 form a rhombus-like structure, and the filler is disposed within the space formed by the rhombus structure. At the same time, because the support 201 is elastic, when the external force is large and the other end of the intermediate member 204 abuts against the adjacent support plate 203, the other end of the intermediate member 204 can move better relative to the adjacent support plate 203, so that the filling layer 200 can better balance the buffering performance and the compressive strength.

[0047] In one embodiment, multiple filler layers 200 are evenly spaced along the length of the fire-resistant shielded control cable, and there is a cutting position between two adjacent filler layers 200; the support plate 203 has a first end and a second end, the first end is connected to one of the base plates 202, and the second end is bent to form a clamping plate 205, and two adjacent clamping plates 205 can be clamped together.

[0048] When existing fire-resistant shielded control cables need to be cut, the hardness and flexibility of the multi-layer structure inside the cable are different. When cutting to the softer filling layer 200, whether by shearing or sawing, the filling layer 200 is prone to displacement under the cutting thrust and is difficult to cut quickly. Moreover, the cut surface is not neat and will produce cutting debris, which is difficult to clean and affects the connection and contact of other layers. In this application, the filler layer 200 is divided into multiple continuous segments, with gaps between adjacent filler layers 200 forming cutting positions. A cutter is used to directly cut at the cutting positions, facilitating the rapid severing of the fire-resistant shielded control cable. Furthermore, both sides of the cutting positions are supported and buffered by elastic filler layers 200, and the snap-fit ​​structure of the clamping plate 205 further enhances the supporting effect of the filler layer 200 and snaps and limits the filler layer 200, thereby reducing the displacement of the filler layer 200 during cutting, facilitating its rapid severing, and resulting in a neater cut surface, reducing cutting debris and minimizing the impact on the connection and contact of other layers.

[0049] The thickness of the filler layer 200 can be equal to the spacing between two adjacent filler layers 200. For the same bracket 201, the clamping plate 205 is located on the side of the corresponding arc-shaped protrusion of the support plate 203; in other words, the angle between the clamping plate 205 and the support plate 203 is an acute angle. When the number of core wires 101 is two, the two brackets 201 are centrally symmetrical about the axis of the fire-resistant shielded control cable to ensure that the fire-resistant shielded control cable is subjected to uniform force in its circumferential direction.

[0050] It is worth noting that the distance between the other substrate 202 and the adjacent support plate 203 is equal to the distance between the two adjacent intermediate parts 204. One end of the other substrate 202 is connected to one of the substrates 202, and the other end of the other substrate 202 is also bent to form a locking plate 205. The locking plate 205 on the other substrate 202 can be engaged with the locking plate 205 on the adjacent support plate 203.

[0051] In one embodiment, the card plate 205 is arranged circumferentially along the fire-resistant shielded control cable. The end of the card plate 205 near the support plate 203 has a slot 206 formed from the outside to the inside, and the end of the card plate 205 away from the support plate 203 has a head 207. Before and after the wrapping layer 301 is set, the card plate 205 has a first state and a second state respectively. In the first state, the head 207 is disengaged from the slot 206 of the adjacent card plate 205 so that the two adjacent card plates 205 form an opening. In the second state, the head 207 is inserted into the slot 206 of the adjacent card plate 205 along the circumferential direction of the fire-resistant shielded control cable.

[0052] Before the wrapping layer 301 is installed, due to the elasticity of the bracket 201, the clamping head 207 disengages from the slot 206 of the adjacent clamping plate 205, so that the two adjacent clamping plates 205 form an opening. At the same time, the other end of the intermediate piece 204 is spaced apart from the adjacent support plate 203 to form an opening. At this time, the filler can be placed in the space of the diamond structure through the two openings, which is convenient for production and installation. After the wrapping layer 301 is installed, since the wrapping layer 301 wraps around the filler layer 200, it exerts circumferential and radial forces on it. The wrapping layer 301 squeezes the clamping plate 205, so that the clamping head 207 is inserted into the slot 206 of the adjacent clamping plate 205 along the circumference of the fire-resistant shielded control cable, realizing the mutual clamping of the two adjacent clamping plates 205.

[0053] In one embodiment, the card slot 206 and the card head 207 are both V-shaped and cooperate with each other, and the card plate 205 is symmetrically arranged about the first plane, which is perpendicular to the length direction of the fire-resistant shielded control cable.

[0054] When the clamping head 207 is engaged in the slot 206 of the adjacent clamping plate 205, it can prevent the two adjacent clamping plates 205 from shifting along the length of the fire-resistant shielded control cable, and prevent the filling layer 200 from deforming along the length of the fire-resistant shielded control cable. At the same time, due to the wrapping effect of the wrapping layer 301, it can prevent the two adjacent clamping plates 205 from shifting circumferentially in the fire-resistant shielded control cable, and together with the bracket 201, it can improve the compressive strength of the filling layer 200 in the circumferential and radial directions of the fire-resistant shielded control cable, thereby achieving the clamping and limiting of the filling layer 200.

[0055] Furthermore, when the clamping plate 205 is in the second state, the clamping head 207 is inserted into the clamping groove 206 of the adjacent clamping plate 205 along the circumference of the fire-resistant shielded control cable, and there is still some play in the movement of the two adjacent clamping plates 205 in the circumference of the fire-resistant shielded control cable. When the cable is subjected to external force, the play in the movement between the two adjacent clamping plates 205 can also improve the buffering performance of the filling layer 200.

[0056] In other embodiments not shown, the card slot 206 and the card head 207 may both be U-shaped and mutually engaging. The card head 207 is inserted into the card slot 206 of the adjacent card plate 205 to achieve mutual engagement between the two.

[0057] In one embodiment, a plurality of connecting wires 208 are provided between two adjacent filling layers 200, and the ends of the connecting wires 208 are connected to the support plate 203.

[0058] During the production of fire-resistant shielded control cables, it is convenient to install the filler layer 200 outside the core wire 101, thereby improving installation efficiency.

[0059] In this embodiment, the connecting wire 208 has a small diameter, making it easy to cut. In other embodiments not shown, the midpoint diameter of the connecting wire 208 between two adjacent filler layers 200 is small, also making it easy to cut at that midpoint.

[0060] After the fire-resistant shielded control cable is produced, two adjacent filler layers 200 are connected by multiple connecting wires 208, and their substrates 202 are correspondingly abutted along the length of the fire-resistant shielded control cable.

[0061] In one embodiment, a shielding layer 209 is provided outside the wrapping layer 301. The shielding layer 209 has a spiral braided structure and forms a gap 210. When the card plate 205 is in the second state, the card head 207 protrudes from the outer surface of the adjacent card plate 205, and the card head 207 causes the wrapping layer 301 to produce a first protrusion. The first protrusion can be inserted into the gap 210.

[0062] Existing fire-resistant shielded control cables, when requiring cutting, have a conductor braided structure for the shielding layer 209. The conductor diameter is relatively thin and the cable is spirally wound. When subjected to cutting force, the shielding layer 209 is prone to displacement, making it difficult to cut quickly. This results in a disordered cross-section of the shielding layer 209, affecting the connection and contact of other layers and hindering subsequent installation. In this application, after the wrapping layer 301 is installed, the clamping head 207 protrudes from the outer surface of the adjacent clamping plate 205, creating a first protrusion in the wrapping layer 301. This first protrusion engages with the gap 210, and multiple first protrusions and corresponding gaps 210 form a concave-convex interlocking structure to limit the position of the shielding layer 209, facilitating its stability. This reduces the displacement of the shielding layer 209 during cutting, allowing for quick cutting. Furthermore, the cut surface of the shielding layer 209 is neater, reducing the impact on the connection and contact of other layers and facilitating subsequent installation.

[0063] In one embodiment, the outer surface of the card plate 205 is curved. When the card plate 205 is in the second state, the outer surface of the card plate 205 causes the wrapping layer 301 to produce a second protrusion, which can be inserted into the gap 210.

[0064] The outer surface of the card plate 205 causes the wrapping layer 301 to produce a second protrusion. The second protrusion is inserted into the gap 210. Multiple second protrusions can also form a concave-convex interlocking structure with the corresponding gap 210 to further limit the shielding layer 209 and make the shielding layer 209 more stable.

[0065] Among them, the axis corresponding to the arc surface of the outer surface of the card plate 205 is perpendicular to the length direction of the fire-resistant shielded control cable.

[0066] The working principle of this invention is as follows:

[0067] During the production of fire-resistant shielded control cables, a fire-resistant layer 302 and an insulation layer 303 are sequentially arranged outside the core wire 101. The filler is placed in the space of the diamond structure on the bracket 201. Then, the filler layer 200 connected by the connecting wire 208 is installed outside the insulation layer 303. After that, a wrapping layer 301, a shielding layer 209, an isolation layer 304, an armor layer 305, and a sheath layer 306 are sequentially arranged.

[0068] When using fire-resistant shielded control cables, the wrapping layer 301, encasing the filler layer 200, exerts circumferential and radial forces on it. The wrapping layer 301 compresses the clamping plate 205, causing the clamping head 207 to engage with the groove 206 of the adjacent clamping plate 205 along the circumference of the fire-resistant shielded control cable. This prevents the adjacent clamping plates 205 from shifting along the length of the fire-resistant shielded control cable, thus preventing deformation of the filler layer 200 along its length. Simultaneously, the wrapping layer 301 prevents the adjacent clamping plates 205 from shifting circumferentially in the fire-resistant shielded control cable and, in conjunction with the bracket 201, enhances the compressive strength of the filler layer 200 in both the circumferential and radial directions, thereby achieving precise clamping and positioning of the filler layer 200.

[0069] When the fire-resistant shielded control cable is subjected to external force, the bracket 201 is compressed and the two adjacent support plates 203 move closer to each other. Because the bracket 201 is elastic and the filler can reduce the speed and distance at which the two adjacent support plates 203 move closer to each other, the buffering performance of the filler layer 200 is improved together. When the external force is large enough that the other end of the intermediate piece 204 abuts against the adjacent support plate 203, the bracket 201 forms a stable support structure and no longer deforms, thereby improving the compressive strength of the filler layer 200. To a certain extent, this prevents the filler layer 200 from being compressed to its limit and losing its effective buffering performance, and prevents external stress from being directly transmitted to the internal core, thus ensuring the structural integrity and reliability of the fire-resistant shielded control cable.

[0070] When cutting fire-resistant shielded control cables, the filler layer 200 is divided into multiple continuous sections. There is a gap between two adjacent filler layers 200, forming a cutting position. The cutter is used to cut directly at the cutting position, which facilitates the quick cutting of the fire-resistant shielded control cable. In addition, both sides of the cutting position are supported and buffered by the elastic filler layer 200. The snap-fit ​​structure of the clamping plate 205 can further enhance the support of the filler layer 200 and snap-fit ​​limit the filler layer 200, thereby reducing the displacement of the filler layer 200 during cutting, making it easier to cut quickly. The cut surface is relatively neat, reducing cutting debris and minimizing the impact on the connection and contact of other layers. For the shielding layer 209, under the action of the wrapping layer 301, the clamping head 207 protrudes from the outer surface of the adjacent clamping plate 205 and causes the wrapping layer 301 to produce a first protrusion. The outer surface of the clamping plate 205 causes the wrapping layer 301 to produce a second protrusion. Both the first and second protrusions can be inserted into the corresponding gaps 210. Multiple first protrusions and multiple second protrusions form a concave-convex interlocking structure with the corresponding gaps 210 to limit the shielding layer 209, which is beneficial to the stability of the shielding layer 209. This reduces the displacement of the shielding layer 209 during cutting, making it easier to cut quickly. After cutting, the cross-section of the shielding layer 209 is relatively neat, reducing the impact on the connection and contact of other layer structures and facilitating subsequent installation.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A fire resistant shielded control cable characterized in that, The fire-resistant shielding control cable comprises a core wire, a filling layer and a wrapping layer arranged from inside to outside, the core wire is arranged at least two, the filling layer comprises a support and a filler, the support is made of elastic material, the number of the support is equal to the number of the core wire, the support is arranged between the core wire and the wrapping layer, the support comprises two base plates and a plurality of support plates, the two base plates are coaxial with the adjacent two core wires, the inner diameter of the base plate is equal to the diameter of the core wire, a plurality of support plates are arranged on one of the base plates along the arc track, the support plate is coaxial with the other base plate, the intermediate piece and the filler are arranged between the adjacent two support plates, one end of the intermediate piece is connected with the support plate, the other end is a free end and faces the adjacent support plate. When the fire-resistant shielding control cable is subjected to external force, the support is extruded, the adjacent two support plates are close to each other, the other end of the intermediate piece gradually approaches and abuts against the adjacent support plate; a plurality of filling layers are arranged at equal intervals along the length direction of the fire-resistant shielding control cable, the cutting position is arranged between the adjacent two filling layers; the support plate has a first end and a second end, the first end is connected with one of the base plates, the second end is bent and formed with a clamping plate, the adjacent two clamping plates can be clamped with each other.

2. The fire resistant shielded control cable of claim 1, wherein, The intermediate piece is plate-shaped, and is arranged between the adjacent two support plates, a plurality of intermediate pieces are arranged at equal intervals along the arc track of the support plate, and the filler is arranged between the adjacent two intermediate pieces.

3. The fire resistant shielded control cable of claim 2, wherein, One end of the intermediate piece is connected with the adjacent two support plates.

4. The fire resistant shielded control cable of claim 3, wherein, The intermediate piece is arc-shaped and coaxial with one of the base plates, and the spacing between the adjacent two support plates is equal to the spacing between the adjacent two intermediate pieces.

5. The fire resistant shielded control cable of claim 1, wherein, The clamping plate is arranged along the circumference of the fire-resistant shielding control cable, one end of the clamping plate close to the support plate is formed with a clamping groove from outside to inside, and the other end of the clamping plate away from the support plate is formed with a clamping head, the clamping plate has a first state and a second state before and after the wrapping layer is arranged, when the clamping plate is in the first state, the clamping head is separated from the clamping groove of the adjacent clamping plate, so that the adjacent two clamping plates form an opening, when the clamping plate is in the second state, the clamping head is clamped into the clamping groove of the adjacent clamping plate along the circumference of the fire-resistant shielding control cable.

6. The fire resistant shielded control cable of claim 5, wherein, The clamping groove and the clamping head are both V-shaped and matched with each other, and the clamping plate is arranged symmetrically about a first plane, and the first plane is perpendicular to the length direction of the fire-resistant shielding control cable.

7. The fire resistant shielded control cable of claim 1, wherein, A plurality of connecting wires are arranged between the adjacent two filling layers, and the ends of the connecting wires are connected with the support plate.

8. The fire resistant shielded control cable of claim 5, wherein, The wrapping layer is provided with a shielding layer, the shielding layer is a spiral woven structure and is formed with a gap, when the clamping plate is in the second state, the clamping head protrudes from the outer surface of the adjacent clamping plate, and the clamping head causes the wrapping layer to form a first protrusion, and the first protrusion can be clamped into the gap.

9. The fire resistant shielded control cable of claim 8, wherein, The outer surface of the clamping plate is arc-shaped, and when the clamping plate is in the second state, the outer surface of the clamping plate causes the wrapping layer to have a second protrusion, and the second protrusion is capable of being clamped into the gap.

Images