A carbon core cable with strong heat resistance

Abstract

The present invention discloses a carbon core cable with strong heat resistance, belonging to the technical field of carbon core cables. It includes a cable body, which is provided with multiple sections. The two ends of the cable body are respectively connected with a first connector and a second connector. The adjacent cable bodies are connected through the first connector and the second connector. At the center of one end of the first connector, a conductive head is fixedly connected, and a number of pins are fixedly connected around the conductive head at one end of the first connector. One end of the second connector is provided with a socket and a butting port. Through the repair layer, the strengthening layer and the repair ball, when a breakage occurs, the repair ball automatically breaks, and the automatic repair function of the breakage is realized by using the repair liquid. By setting the hollow tube, the first connector and the second connector, when the temperature of the cable core is abnormal, the first connector and the second connector are separated from each other, realizing the power-off function of the cable and avoiding further increase in the cable temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon core cables, and particularly relates to a carbon core cable with strong heat resistance. Background Art

[0002] The cable core of a carbon core cable is made of carbon fiber. Carbon core cables are mainly used for heating. There are many usage environments for carbon core cables. For carbon core cables buried underground, due to the humid underground environment and the complex underground environment, the cable surface skin is inevitably corroded. In addition, since the cable is often buried underground, the cable surface skin is inevitably worn. The worn skin will have a breakage opening, which can no longer protect the cable core inside the cable, reducing the service life of the cable core.

[0003] In addition, cables buried underground will inevitably experience abnormal temperature due to some factors (such as the cable being squeezed by foreign objects, the cable core aging, the cable short-circuiting, etc.) during long-term use. The probability of spontaneous combustion of the cable in an abnormal temperature state increases greatly. The spontaneously burning cable will burn the nearby cables together, causing irreparable losses. Therefore, a carbon core cable with strong heat resistance is proposed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art, and a carbon core cable with strong heat resistance is proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A carbon core cable with strong heat resistance includes a cable body. The cable body is provided with multiple sections. The two ends of the cable body are respectively connected with a first connector and a second connector. Adjacent cable bodies are connected through the first connector and the second connector. One end center of the first connector is fixedly connected with a conductive head. A plurality of pins are fixedly connected around the conductive head at one end of the first connector. An annular notch is opened on the surface of the pin. A magnetic attraction block is fixedly connected to the inner wall of the annular notch. A plurality of sockets matching the pins are opened at one end of the second connector. An interface is opened at the center of one end of the second connector. A docking block is fixedly connected to the inner bottom end of the interface. An inner cavity is opened inside the second connector between adjacent sockets. A communication groove is opened between the inner cavity and the socket. A locking rod is slidably connected in the communication groove. The locking rod and the magnetic attraction block are magnetically attracted to each other. One end of the locking rod is fixedly connected with a limiting plate. An "L"-shaped rod is fixedly connected to one side surface of the limiting plate. Trapezoidal blocks are fixedly connected to both side surfaces of the "L"-shaped rod.

[0007] The cable body is composed of a cable core, an insulating layer, a polyethylene layer, a repair layer, a hollow tube, a PVC outer skin layer and a PVC inner skin layer. The outer surface of the insulating layer is wrapped with an insulating layer. The outer surface of the insulating layer is wrapped with a polyethylene layer. The outer surface of the polyethylene layer is wrapped with a repair layer. A number of hollow tubes are arranged inside the repair layer. A number of repair balls are arranged inside the repair layer.

[0008] Preferably, one end of the cable core is fixedly connected to a docking block, and the other end of the cable core is fixedly connected to a conductive head. One end of the hollow tube is fixedly connected to an exhaust pipe, and one end of the exhaust pipe extends to the inside of the inner cavity and is fixedly connected to an airbag at this end. The outer surface of the cable body is fixedly connected to a sliding frame, and the first connector is slidably connected to the sliding frame.

[0009] Preferably, the inclined surfaces of the two trapezoidal blocks are arranged oppositely. An unlocking rod is arranged between the inclined surfaces of the trapezoidal blocks. A moving plate is slidably connected to the inside of the inner cavity, and a push rod is fixedly connected to one side surface of the moving plate.

[0010] Preferably, a sleeve is sleeved outside the push rod. An auxiliary plate is fixedly connected between the sleeve and the inner wall of the inner cavity. One end of the unlocking rod is fixedly connected to a connecting plate, and a force-applying spring is fixedly connected between the connecting plate and the auxiliary plate.

[0011] Preferably, a sliding block is slidably connected to the inside of the socket. A telescopic rod is fixedly connected between the sliding block and the inner bottom end of the socket. A return spring is wound around the surface of the telescopic rod.

[0012] Preferably, a carbon fiber layer is arranged on the outer surface of the hollow tube. Carbon fibers are arranged on both the inner and outer surfaces of the carbon fiber layer. The inner carbon fiber extends to the inside of the hollow tube, and the outer carbon fiber is fixedly connected to the cable core.

[0013] Preferably, a second elastic membrane is fixedly connected to the inner side surface of the hollow tube. Ammonium bicarbonate powder is filled inside the hollow tube. A first elastic membrane is fixedly connected between adjacent hollow tubes, and the first elastic membrane is in an expanded state.

[0014] Preferably, the repair ball is composed of a fluff layer and a shell. A repair liquid mixed with a glue-like substance, PVC material powder and bright powder is filled inside the shell. The fluff layer is fixedly connected to the outer surface of the shell.

[0015] Preferably, the fluff layer is composed of moisture-absorbing cotton and elastic fibers, and the moisture-absorbing cotton is arranged on the surface of the elastic fibers.

[0016] Preferably, the outer layer of the repair layer is in the form of a thin film. The inner side of the PVC inner skin layer is fixedly connected to the outer layer of the repair layer. There is a PVC outer skin layer arranged on the outside of the PVC inner skin layer. A reinforcing layer is arranged between the PVC outer skin layer and the PVC inner skin layer. The reinforcing layer is a net-like structure made of metal wires.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In the present invention, by providing a repair layer, a reinforcing layer and a repair ball, when the PVC inner skin layer and the PVC outer skin layer are damaged, under the action of the first elastic membrane, the repair ball is squeezed into the damaged opening. Under the action of the extrusion force, the reinforcing layer has a cutting force on the repair ball (the reinforcing layer is a net-like structure made of metal wires, and the metal wires generate a large pressure on the repair ball), so that cracks can be cut out on the surface of the repair ball, enabling the repair liquid inside the repair ball to leak out. The leaked repair liquid will quickly fill the damaged opening, and after the repair liquid solidifies, the automatic repair function of the PVC inner skin layer and the PVC outer skin layer is realized.

[0019] 2. In the present invention, by providing a hollow tube, a first connector and a second connector, when the temperature of the cable core is abnormal, the ammonium bicarbonate powder decomposes into gas, and enters the airbag through the exhaust pipe under the extrusion action of the second elastic membrane, causing the airbag to expand. The expanded airbag will push the push rod to move, causing the push rod to push the unlocking rod to move, causing the unlocking rod to push against the inclined surface of the trapezoidal block, thereby pushing the trapezoidal block to both sides, causing the "L"-shaped rod to drive the locking rod to move, separating it from the annular notch, causing the plug pin to pop out of the socket under the elastic force of the return spring, and further separating the first connector and the second connector, realizing the power-off function of the cable and preventing the temperature of the cable core from rising further. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the connection structure of the first connector and the second connector in a heat-resistant carbon core cable proposed by the present invention Figure 1 ;

[0021] Figure 2 Schematic diagram of the connection structure of the first connector and the second connector in a heat-resistant carbon core cable proposed by the present invention Figure 2 。

[0022] Figure 3 Schematic diagram of the internal structure of a heat-resistant carbon core cable proposed by the present invention;

[0023] Figure 4 is Figure 1 Enlarged structural diagram at position A in

[0024] Figure 5 is Figure 1 Enlarged structural diagram at position B in

[0025] Figure 6 Schematic cross-sectional structure diagram of a cable body in a carbon core cable with strong heat resistance proposed by the present invention;

[0026] Figure 7 Schematic structure diagram of a repair ball in a carbon core cable with strong heat resistance proposed by the present invention;

[0027] Figure 8 Schematic position state structure diagram of an unlocking rod and a trapezoidal block in a carbon core cable with strong heat resistance proposed by the present invention;

[0028] Figure 9 Schematic structure diagram of a damaged opening when the surface of the cable body in a carbon core cable with strong heat resistance is damaged;

[0029] In the figure: 1. Cable body; 2. Sliding frame; 3. First connector; 4. Cable core; 5. Hollow tube; 6. Second connector; 601. Socket; 602. Docking port; 7. Reinforcing layer; 8. PVC outer skin layer; 9. PVC inner skin layer; 10. Repair ball; 11. Repair layer; 12. Polyethylene layer; 13. Insulating layer; 14. First elastic membrane; 15. Carbon fiber; 16. Second elastic membrane; 17. Carbon fiber layer; 18. Outer shell; 19. Fluffy layer; 20. Hygroscopic cotton; 21. Elastic fiber; 22. Bolt; 2201. Annular notch; 23. Sliding block; 24. Return spring; 25. Telescopic rod; 26. Locking rod; 27. Magnetic attraction block; 28. Exhaust pipe; 29. Airbag; 30. Moving plate; 31. Unlocking rod; 32. "L"-shaped rod; 33. Trapezoidal block; 34. Connecting plate; 35. Biasing spring; 36. Push rod; 37. Limiting plate; 38. Conductive head. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Refer to Figures 1-6, A carbon core cable with strong heat resistance, including a cable body 1. The cable body 1 is provided with multiple segments. The two ends of the cable body 1 are respectively connected with a first connector 3 and a second connector 6. The first connector 3 and the second connector 6 can realize the connection function between cables. Adjacent cable bodies 1 are connected through the first connector 3 and the second connector 6. At the center of one end of the first connector 3, a conductive head 38 is fixedly connected. Around the conductive head 38 at one end of the first connector 3, a number of pins 22 are fixedly connected. An annular notch 2201 is formed on the surface of the pin 22. A magnetic attraction block 27 is fixedly connected to the inner wall of the annular notch 2201. The magnetic attraction block 27 can suck the locking rod 26 into the annular notch 2201 to realize the locking function of the pin 22. At one end of the second connector 6, a number of sockets 601 matching the pins 22 are formed. At the center of one end of the second connector 6, a docking port 602 is formed. A docking block is fixedly connected to the inner bottom end of the docking port 602. An inner cavity is formed inside the second connector 6 between adjacent sockets 601. A communication groove is formed between the inner cavity and the socket 601. A locking rod 26 is slidably connected in the communication groove. The locking rod 26 and the magnetic attraction block 27 are magnetically attracted to each other. One end of the locking rod 26 is fixedly connected with a limiting plate 37. An "L"-shaped rod 32 is fixedly connected to one side surface of the limiting plate 37. Trapezoidal blocks 33 are fixedly connected to both side surfaces of the "L"-shaped rod 32;

[0032] The cable body 1 is composed of a cable core 4, an insulating layer 13, a polyethylene layer 12, a repair layer 11, a hollow tube 5, a PVC outer skin layer 8 and a PVC inner skin layer 9. The outer surface of the insulating layer 13 is wrapped with the insulating layer 13. The outer surface of the insulating layer 13 is wrapped with the polyethylene layer 12. The outer surface of the polyethylene layer 12 is wrapped with the repair layer 11. A number of hollow tubes 5 are arranged inside the repair layer 11. A number of repair balls 10 are arranged inside the repair layer 11. The repair balls 10 are used to repair the damaged openings of the PVC outer skin layer 8 and the PVC inner skin.

[0033] Refer to Figure 5 , One end of the cable core 4 is fixedly connected with the docking block, and the other end of the cable core 4 is fixedly connected with the conductive head 38. One end of the hollow tube 5 is fixedly connected with an exhaust pipe 28. One end of the exhaust pipe 28 extends into the inner cavity and is fixedly connected with an airbag 29 at this end. A sliding frame 2 is fixedly connected to the outer surface of the cable body 1. The first connector 3 and the sliding frame 2 are slidably connected.

[0034] Further advantages are achieved: The setting of the exhaust pipe 28 facilitates the discharge of the gas inside the hollow tube 5 into the airbag 29. The setting of the sliding frame 2 enables the first connector 3 to slide, so that the first connector 3 can be separated from the second connector 6.

[0035] Refer to Figure 8, the inclined surfaces of the two trapezoidal blocks 33 are arranged oppositely. An unlocking rod 31 is arranged between the inclined surfaces of the trapezoidal blocks 33. A moving plate 30 is slidably connected inside the inner cavity, and a push rod 36 is fixedly connected to one side surface of the moving plate 30.

[0036] Further advantage: Under the action of the push rod 36, the unlocking rod 31 is inserted between the trapezoidal blocks 33, causing the trapezoidal blocks 33 to move away from each other, thereby driving the locking rod 26 to move, so that the locking rod 26 moves away from the annular notch 2201, realizing the unlocking function.

[0037] Refer to Figure 5 , a sleeve is sleeved outside the push rod 36. An auxiliary plate is fixedly connected between the sleeve and the inner wall of the inner cavity. One end of the unlocking rod 31 is fixedly connected with a connecting plate 34, and a biasing spring 35 is fixedly connected between the connecting plate 34 and the auxiliary plate.

[0038] Further advantage: The biasing spring 35 is used to apply a thrust to the unlocking rod 31, causing the trapezoidal blocks 33 to move away from each other without external force, and further causing the locking rod 26 to move away from the socket 601.

[0039] Refer to Figure 4 , a sliding block 23 is slidably connected inside the socket 601. A telescopic rod 25 is fixedly connected between the sliding block 23 and the inner bottom end of the socket 601. A return spring 24 is wound around the surface of the telescopic rod 25.

[0040] Further advantage: After the bolt 22 is unlocked, the return spring 24 can eject the bolt 22 out of the socket 601, thereby separating the first connector 3 and the second connector 6, and separating the conductive head 38 from the docking block, realizing the power-off function of the cable body 1.

[0041] Refer to Figure 6 , a carbon fiber layer 17 is arranged on the outer surface of the hollow tube 5. Carbon fibers 15 are arranged on both the inner and outer surfaces of the carbon fiber layer 17. The inner carbon fiber 15 extends into the hollow tube 5, and the outer carbon fiber 15 is fixedly connected to the cable core 4.

[0042] Further advantage: The carbon fiber layer 17 can quickly transfer the heat of the cable core 4 into the hollow tube 5, causing the ammonium bicarbonate powder to decompose to produce gas (chemical equation for the thermal decomposition of ammonium bicarbonate: NH4HCO3 = NH3 + H2O + CO2).

[0043] A second elastic membrane 16 is fixedly connected to the inner side surface of the hollow tube 5. The inner side of the hollow tube 5 is filled with ammonium bicarbonate powder. A first elastic membrane 14 is fixedly connected between adjacent hollow tubes 5, and the first elastic membrane 14 is in an inflated state.

[0044] Achieve further benefits: The second elastic membrane 16 can squeeze ammonium bicarbonate powder to decompose and generate gas, enabling the gas to quickly enter the interior of the airbag 29, causing the airbag 29 to expand rapidly. The first elastic membrane 14 can give the repair ball 10 a pushing force, and at the same time cooperate with the reinforcing layer 7 to realize the cutting function of the repair ball 10.

[0045] Refer to Figure 7 , the repair ball 10 is composed of a fluff layer 19 and a housing 18. The inner side of the housing 18 is filled with a repair liquid mixed with a gel, PVC material powder, and bright powder. The fluff layer 19 is fixedly connected to the outer surface of the housing 18.

[0046] Achieve further benefits: The repair liquid can realize the automatic repair function of the damaged opening. The fluff can play a temporary blocking function for the damaged opening, preventing external moisture from entering the cable when the damaged opening occurs. The bright powder in the repair liquid has a reflective function, enabling maintenance personnel to quickly discover the damaged opening of the cable during cable maintenance.

[0047] The fluff layer 19 is composed of a moisture-absorbing cotton 20 and elastic fibers 21. The moisture-absorbing cotton 20 is arranged on the surface of the elastic fibers 21.

[0048] Achieve further benefits: The moisture-absorbing cotton 20 can absorb external moisture and at the same time play a blocking role for the damaged opening.

[0049] Refer to Figure 6 and Figure 9 , the outer layer of the repair layer 11 is film-shaped. The inner side of the PVC inner skin layer 9 is fixedly connected to the outer layer of the repair layer 11. There is a PVC outer skin layer 8 on the outside of the PVC inner skin layer 9. A reinforcing layer 7 is arranged between the PVC outer skin layer 8 and the PVC inner skin layer 9. The reinforcing layer 7 is a mesh structure made of metal wires.

[0050] Achieve further benefits: The reinforcing layer 7 can strengthen the strength of the cable surface and at the same time play a cutting role for the repair ball 10, enabling the repair liquid inside it to flow out quickly and realizing the rapid repair function of the damaged opening.

[0051] When the present invention is in use, when the cable body 1 is buried underground and its surface is damaged due to wear, under the action of the first elastic membrane 14, the repair ball 10 is squeezed into the damaged opening. Under the action of the pushing force, the reinforcing layer 7 has a cutting force on the repair ball 10 (the reinforcing layer 7 is a mesh structure made of metal wires, and the metal wires generate a large pressure on the repair ball 10), so that cracks can be cut out on the surface of the repair ball 10, enabling the repair liquid inside the repair ball 10 to leak out. The leaked repair liquid will quickly fill the damaged opening, and after the repair liquid solidifies, the automatic repair function of the PVC inner skin layer 9 and the PVC outer skin layer 8 is realized.

[0052] The bright powder in the repair liquid has a reflective function, enabling maintenance personnel to quickly detect the damaged part of the cable when repairing the cable.

[0053] When the temperature of the cable core 4 is abnormal, the heat on the surface of the cable core 4 is introduced into the hollow tube 5 through the carbon fiber 15, causing the ammonium bicarbonate powder to decompose into gas. Under the extrusion of the second elastic membrane 16, it quickly enters the airbag 29 through the exhaust pipe 28, causing the airbag 29 to expand rapidly. The expanded airbag 29 will push the push rod 36 to move, causing the push rod 36 to push the unlocking rod 31 to move, causing the unlocking rod 31 to push against the inclined surface of the trapezoidal block 33, thereby causing the trapezoidal block 33 to move to both sides, causing the "L"-shaped rod 32 to drive the locking rod 26 to move, separating it from the annular notch 2201, realizing the unlocking function of the bolt 22. At this time, the bolt 22 pops out of the socket 601 under the elastic force of the return spring 24, further causing the first connector 3 and the second connector 6 to separate, and at the same time, the conductive head 38 is separated from the docking block, realizing the power-off function of the cable, and preventing the temperature of the cable core 4 from rising further.

[0054] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, with equivalent substitution or change, should be covered within the protection scope of the present invention.

Claims

1. A carbon core cable with strong heat resistance, comprising a cable body (1), characterized in that, The cable body (1) is provided with multiple segments. The two ends of the cable body (1) are respectively connected with a first connector (3) and a second connector (6). Adjacent cable bodies (1) are connected through the first connector (3) and the second connector (6). At the center of one end of the first connector (3), a conductive head (38) is fixedly connected. Around the conductive head (38) at one end of the first connector (3), a plurality of pins (22) are fixedly connected. An annular notch (2201) is formed on the surface of the pin (22). A magnetic attraction block (27) is fixedly connected to the inner wall of the annular notch (2201). A plurality of sockets (601) matching the pins (22) are formed at one end of the second connector (6). An interface (602) is formed at the center of one end of the second connector (6). A docking block is fixedly connected to the inner bottom end of the interface (602). An inner cavity is formed inside the second connector (6) between adjacent sockets (601). A communication groove is formed between the inner cavity and the socket (601). A locking rod (26) is slidably connected in the communication groove. The locking rod (26) and the magnetic attraction block (27) are magnetically attracted to each other. A limiting plate (37) is fixedly connected to one end of the locking rod (26). An "L"-shaped rod (32) is fixedly connected to one side surface of the limiting plate (37). Trapezoidal blocks (33) are fixedly connected to both side surfaces of the "L"-shaped rod (32); The cable body (1) is composed of a cable core (4), an insulating layer (13), a polyethylene layer (12), a repair layer (11), a hollow tube (5), a PVC outer skin layer (8) and a PVC inner skin layer (9). The outer surface of the cable core (4) is wrapped with the insulating layer (13). The outer surface of the insulating layer (13) is wrapped with the polyethylene layer (12). The outer surface of the polyethylene layer (12) is wrapped with the repair layer (11). A plurality of hollow tubes (5) are arranged inside the repair layer (11). A plurality of repair balls (10) are arranged inside the repair layer (11); One end of the hollow tube (5) is fixedly connected with an exhaust pipe (28). One end of the exhaust pipe (28) extends into the inner cavity and a balloon (29) is fixedly connected to this end; The inclined surfaces of the two trapezoidal blocks (33) are arranged oppositely. An unlocking rod (31) is arranged between the inclined surfaces of the trapezoidal blocks (33). A moving plate (30) is slidably connected inside the inner cavity. A push rod (36) is fixedly connected to one side surface of the moving plate (30). The other side surface of the moving plate (30) faces the balloon (29); A second elastic membrane (16) is fixedly connected to the inner side surface of the hollow tube (5). The inner side of the hollow tube (5) is filled with ammonium bicarbonate powder.

2. The heat-resistant carbon core cable according to claim 1, wherein: One end of the cable core (4) is fixedly connected with the docking block. The other end of the cable core (4) is fixedly connected with the conductive head (38). A sliding frame (2) is fixedly connected to the outer surface of the cable body (1). The first connector (3) and the sliding frame (2) are slidably connected.

3. The heat-resistant carbon core cable according to claim 1, characterized in that: A sleeve is sleeved outside the push rod (36), and an auxiliary plate is fixedly connected between the sleeve and the inner wall of the inner cavity. One end of the unlocking rod (31) is fixedly connected with a connecting plate (34), and a force-applying spring (35) is fixedly connected between the connecting plate (34) and the auxiliary plate.

4. The heat-resistant carbon core cable according to claim 1, characterized in that: A sliding block (23) is slidably connected inside the socket (601), and a telescopic rod (25) is fixedly connected between the sliding block (23) and the inner bottom end of the socket (601). A return spring (24) is wound around the surface of the telescopic rod (25).

5. The heat-resistant carbon core cable according to claim 1, characterized in that: A carbon fiber layer (17) is provided on the outer surface of the hollow tube (5). Carbon fibers (15) are provided on both the inner and outer surfaces of the carbon fiber layer (17). The inner carbon fiber (15) extends into the hollow tube (5), and the outer carbon fiber (15) is fixedly connected to the cable core (4).

6. The heat-resistant carbon core cable according to claim 1, characterized in that: A first elastic membrane (14) is fixedly connected between adjacent hollow tubes (5), and the first elastic membrane (14) is in an inflated state.

7. The heat-resistant carbon core cable according to claim 1, characterized in that: The repair ball (10) is composed of a fluff layer (19) and a shell (18). The inside of the shell (18) is filled with a repair liquid mixed with a glue-like substance, PVC material powder, and bright powder. The fluff layer (19) is fixedly connected to the outer surface of the shell (18).

8. The heat-resistant carbon core cable according to claim 7, characterized in that: The fluff layer (19) is composed of moisture-absorbing cotton (20) and elastic fibers (21), and the moisture-absorbing cotton (20) is provided on the surface of the elastic fibers (21).

9. The heat-resistant carbon core cable according to claim 1, characterized in that: The outer layer of the repair layer (11) is in a film shape. The inner side of the PVC inner skin layer (9) is fixedly connected to the outer layer of the repair layer (11). A PVC outer skin layer (8) is provided outside the PVC inner skin layer (9). A reinforcing layer (7) is provided between the PVC outer skin layer (8) and the PVC inner skin layer (9), and the reinforcing layer (7) is a mesh structure made of metal wires.

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