Wire core twisting device for preparing composite fire-resistant cable

Abstract

The invention discloses a wire core twisting device for preparation of a composite fire-resistant cable, and relates to the technical field of intelligent power grid industry. During twisting production of a wire core of the composite fire-resistant cable, a pressing ring capable of axially moving back and forth in a reciprocating manner is arranged in front of a twisting position, and by means of the reciprocating pushing action of the pressing ring, the wire core of the composite fire-resistant cable is twisted; periodic axial compaction force can be applied to the second wires and the fireproof wires which are gathered and twisted, the second wires and the fireproof wires which are twisted on the outer side of the first wires are forced to be close to each other, and tiny gaps generated when multiple strands of second wires are matched with the fireproof wires to be twisted can be effectively eliminated. And the twisting density and the structural integrity of the formed cable core are improved, so that the mechanical firmness and the fire-resistant flame-proof performance of the formed cable are improved to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of smart grid industry technology, and in particular to a core stranding device for the preparation of composite fire-resistant cables. Background Technology

[0002] In the production process of composite fire-resistant cables, core stranding is one of the core processes that determines the performance of the cable, and its quality is directly related to the final fire resistance and structural stability of the cable.

[0003] Existing wire stranding devices mostly rely on a single traction and rotation mechanism to achieve the stranding action. When multiple conductors enter the stranding area, there is a lack of precise alignment of the conductors. This leads to axial dispersion and insufficient stranding tightness when multiple conductors are stranded into a single wire core. As a result, tiny gaps easily form inside the stranded wire core. These gaps not only reduce the overall density of the wire core and affect the structural strength of the cable after forming, but also become channels for flames and high-temperature gases. This leads to a significant reduction in the fire resistance limit of the formed cable, making it unable to meet the stringent performance requirements of composite fire-resistant cables in critical scenarios such as high-rise buildings and rail transit. Summary of the Invention

[0004] The purpose of this invention is to solve the shortcomings of existing technologies where gaps easily exist between conductors during the stranding process of cable cores, affecting the structural strength and fire resistance of the formed cable. Therefore, this invention proposes a core stranding device for the preparation of composite fire-resistant cables.

[0005] To address the problems existing in the prior art, the present invention adopts the following technical solution: A wire core stranding device for preparing composite fire-resistant cables includes a support frame. A wire feeding mechanism 1, a wire feeding mechanism 2, a stranding mechanism, and a wire take-up mechanism are sequentially mounted on the support frame. The wire feeding mechanism 1 includes a wire feeding drum 1 for releasing a conductor 1. The wire feeding mechanism 2 includes a bearing seat 2 fixedly mounted on the support frame, and a rotating shaft 2 rotatably mounted within the bearing seat 2. A drive unit is externally connected to the rotating shaft 2. A through hole 2 is formed at the central axis position of the rotating shaft 2. A turntable is fixedly mounted on the rotating shaft 2, and multiple rotating shafts 3 evenly distributed around the rotating shaft 2 are mounted within the turntable. The rotating shafts 3 are parallel to the rotating shaft 2. A wire feeding frame 2 is fixedly mounted on the rotating shaft 3, and a wire feeding mechanism 2 is rotatably mounted within the wire feeding frame 2. The second spool has its rotating shaft perpendicular to the third shaft. Part of the second spool is used to release the second conductor and part is used to release the refractory wire. The twisting mechanism includes a winch fixedly installed at the rear end of the second shaft, and the winch has multiple threading holes evenly distributed around the second shaft. A fixed tube communicating with the second through hole is fixedly installed at the rear end of the second shaft, and an insert tube is slidably inserted into the fixed tube. A pressure ring located outside the fixed tube is fixedly installed at the rear end of the insert tube. An electric push rod for controlling the forward and backward movement of the pressure ring is fixedly installed in the second through hole. The first conductor, the second conductor, and the refractory wire are twisted into a core behind the pressure ring. The take-up mechanism includes a take-up spool, and the core is wound onto the take-up spool.

[0006] Preferably, the wire feeding mechanism 1 further includes a bearing 1 fixedly installed on the support frame, and a rotating shaft 1 is installed inside the bearing 1. A wire feeding frame 1 is fixedly installed on the rotating shaft 1, and a wire feeding drum 1 is rotatably installed inside the wire feeding frame 1. The rotation axis of the wire feeding drum 1 is perpendicular to the rotating shaft 1.

[0007] Preferably, the take-up mechanism further includes a base mounted on a support frame, and a bearing seat three is fixedly mounted on the base. A rotating shaft four is installed inside the bearing seat three, and a take-up frame is fixedly mounted on the rotating shaft four. The take-up drum is rotatably installed inside the take-up frame, and the rotating shaft of the take-up drum is perpendicular to the rotating shaft four.

[0008] Preferably, rotating shaft one, rotating shaft two, and rotating shaft four are on the same straight line. A through channel one is opened at the central axis position inside rotating shaft one, and a through hole three is opened at the central axis position inside rotating shaft three. Multiple conduits are fixedly installed on the turntable. The multiple conduits are evenly distributed around rotating shaft two in conjunction with multiple rotating shaft threes. A through hole four is opened at the central axis position inside rotating shaft four. Wire one passes through channel one, through hole two, and the inside of the conduit in sequence. Wire two and fire-resistant wire pass through the corresponding through hole three and the inside of the conduit in sequence. The wire core passes through the inside of through hole four.

[0009] Preferably, the first rotating shaft is rotatably connected to the first bearing seat, the fourth rotating shaft is rotatably connected to the third bearing seat, and both the first and fourth rotating shafts are externally connected to a drive unit.

[0010] Preferably, there are multiple turntables, which are connected in series and fixed on the rotating shaft 2. There are four wire feeding frames 2 in the same turntable. The wire feeding frames 2 in the multiple turntables are arranged radially in an alternating manner. The rotating shaft 3 is rotatably connected to the turntables and is externally connected to a drive unit.

[0011] Preferably, a support plate located in front of the pressure ring is fixedly installed at the rear end of the fixed tube, and multiple positioning holes are evenly distributed around the insertion tube on the support plate, with the second wire and the fire-resistant wire passing through the multiple positioning holes in an alternating manner.

[0012] Preferably, a support frame is fixedly installed on the support frame, located behind the twisting mechanism, and a mold cylinder is fixedly installed on the support frame, which is in the same straight line as the insertion tube. A cylindrical airbag is fixedly installed inside the mold cylinder, and an air pump is connected to the outside of the cylindrical airbag. The cylindrical airbag is located at the twisting position of the first wire, the second wire, and the refractory wire.

[0013] Preferably, an electric slide rail is fixedly installed on the support frame, and the base is fixedly installed on the sliding end of the electric slide rail.

[0014] Preferably, a second support is fixedly installed on the support frame behind the first support, and a first conveyor wheel symmetrically arranged vertically is rotatably installed on the second support. A third support is fixedly installed on the base in front of the third shaft seat, and a second conveyor wheel symmetrically arranged vertically is rotatably installed on the third support. Both the first and second conveyor wheels are externally connected to a drive unit, and the wire core passes sequentially between the two symmetrically arranged first and second conveyor wheels.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by providing a pressure ring that can move back and forth axially in front of the stranding position, the reciprocating pushing action of the pressure ring can apply a periodic axial pressure to the conductor two and the fire-resistant wire that are being stranded together, forcing the conductor two and the fire-resistant wire stranded on the outside of the conductor one to come close together. This can effectively eliminate the small gaps generated when the multiple conductor two strands are stranded together with the fire-resistant wire, which is beneficial to improving the stranding density and structural integrity after the core is formed, thereby improving the mechanical strength and fire resistance and flame insulation performance of the formed cable to a certain extent. 2. In this invention, a cylindrical airbag with elastic wrapping capability is provided behind the stranding position. With the expansion of the cylindrical airbag after inflation, a uniform radial constraint and wrapping can be formed inside the initially stranded but not yet shaped wire core. Combined with the axial compression of the pressure ring, a dynamically tight stranding environment can be provided for conductor one, conductor two and fire-resistant wire. Through the cooperation of axial compaction and radial wrapping, the tiny gaps generated inside when multiple conductors are stranded can be further eliminated, and the fire resistance performance of the cable after forming can be improved. 3. In this invention, by setting the first wire feeding frame in the first wire feeding mechanism to be rotatable and the second wire taking frame in the first wire taking mechanism to be rotatable, and by linking the speed of the two with the second rotating shaft that generates the main twisting rotation, the torsional stress accumulated by the wire core during the forming and transmission process can be actively counteracted, which helps to avoid excessive twisting or loosening of the wire core after forming. At the same time, by setting two pairs of conveyor wheels between the twisting point and the take-up point, and setting a vision sensor to monitor the state of the wire core, and by combining the electric slide rail to adjust the front and rear positions of the take-up mechanism, intelligent dynamic adjustment of the wire core tension and torque buffer distance can be achieved, which helps to ensure the continuous stability of production and the forming quality of the wire core. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a perspective view of the invention from the front. Figure 2 This is a perspective view of the invention from the rear view. Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 5 This is a perspective view of the multiple turntables and multiple wire feeding frames of the present invention; Figure 6 This is a perspective view of the cannula and pressure ring of the present invention; Figure 7 This is a top view of the present invention; Figure 8 For the present invention Figure 7 Sectional view at CC; Figure 9 For the present invention Figure 8 Enlarged view at point D; Figure 10 For the present invention Figure 8 Enlarged view at point E in the middle; Figure 11 For the present invention Figure 10 Enlarged view of point F in the middle.

[0017] In the picture: 1. Support frame; 2. Shaft seat 1; 21. Rotating shaft 1; 22. Channel 1; 23. Cable feeder 1; 24. Cable feeder 1; 3. Shaft seat two; 31. Rotating shaft two; 32. Through hole two; 33. Turntable; 34. Rotating shaft three; 35. Through hole three; 36. Wire feeding frame two; 37. Wire feeding spool two; 38. Wire threading tube; 4. Winch; 41. Threading hole; 42. Fixing tube; 43. Insertion tube; 44. Pressure ring; 45. Electric actuator; 46. Support plate; 47. Positioning hole; 5. Frame 1; 51. Mold cylinder; 52. Cylindrical airbag; 53. Frame 2; 54. Conveyor wheel 1; 6. Base; 61. Shaft seat three; 62. Rotating shaft four; 63. Through hole four; 64. Take-up frame; 65. Take-up drum; 66. Electric slide rail; 67. Bracket three; 68. Conveyor wheel two. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example: This example provides a core stranding device for preparing composite fire-resistant cables. See [link to example]. Figure 1 - Figure 11 Specifically, it includes a support frame 1, on which a wire feeding mechanism 1, a wire feeding mechanism 2, a twisting mechanism, and a wire take-up mechanism are installed in sequence.

[0020] The wire feeding mechanism includes a wire feeding drum 24, which is used to release the wire. The wire feeding mechanism also includes a bearing seat 2 fixedly installed on the support frame 1, and a rotating shaft 21 is installed inside the bearing seat 2. A through channel 22 is opened at the central axis position inside the rotating shaft 21. A wire feeding frame 23 is fixedly installed on the rotating shaft 21. The wire feeding drum 24 is rotatably installed inside the wire feeding frame 23. The rotation axis of the wire feeding drum 24 is perpendicular to the rotating shaft 21.

[0021] The second wire feeding mechanism includes a bearing seat 3 fixedly mounted on a support frame 1, and a rotating shaft 31 rotatably mounted inside the bearing seat 3. A drive unit is externally connected to the rotating shaft 31. A through hole 32 is formed at the central axis position inside the rotating shaft 31. A turntable 33 is fixedly mounted on the rotating shaft 31, and multiple rotating shafts 34 evenly distributed around the rotating shaft 31 are installed inside the turntable 33. The rotating shafts 34 are arranged parallel to the rotating shaft 31, and the central axis position inside the rotating shafts 34 is... A through hole 35 is provided, and a wire feeding frame 36 is fixedly installed on the rotating shaft 34. A wire feeding drum 37 is rotatably installed inside the wire feeding frame 36. The rotation axis of the wire feeding drum 37 is perpendicular to the rotating shaft 34. Part of the wire feeding drum 37 is used to release the conductor 2, and part of the wire feeding drum 37 is used to release the refractory wire. Multiple wire threading tubes 38 are fixedly installed on the turntable 33. The multiple wire threading tubes 38 are evenly distributed around the rotating shaft 31 in conjunction with the multiple rotating shafts 34.

[0022] The twisting mechanism includes a winch 4 fixedly installed at the rear end of the second shaft 31, and a plurality of wire-passing holes 41 evenly distributed around the second shaft 31 are opened through the winch 4. A fixed tube 42 communicating with the second through hole 32 is fixedly installed at the rear end of the second shaft 31, and an insert tube 43 is slidably inserted into the fixed tube 42. A pressure ring 44 located outside the fixed tube 42 is fixedly installed at the rear end of the insert tube 43. An electric push rod 45 for controlling the forward and backward movement of the pressure ring 44 is fixedly installed in the second through hole 32. Wire 1, Wire 2 and refractory wire are twisted into a wire core behind the pressure ring 44. A support plate 46 located in front of the pressure ring 44 is fixedly installed at the rear end of the fixed tube 42, and a plurality of positioning holes 47 evenly distributed around the insert tube 43 are opened on the support plate 46. Wire 2 and refractory wire pass through the interior of the plurality of positioning holes 47 in an alternating manner.

[0023] The take-up mechanism includes a take-up drum 65, on which the wire core is wound. The take-up mechanism also includes a base 6 mounted on a support frame 1, and a bearing seat 61 is fixedly mounted on the base 6. A rotating shaft 62 is installed inside the bearing seat 61. A through hole 63 is provided at the central axis position inside the rotating shaft 62. A take-up frame 64 is fixedly mounted on the rotating shaft 62. The take-up drum 65 is rotatably mounted inside the take-up frame 64. The rotation axis of the take-up drum 65 is perpendicular to the rotating shaft 62.

[0024] Shaft 1 21, shaft 2 31 and shaft 4 62 are in a straight line. Wire 1 passes through the inside of channel 1 22, through hole 2 32 and insert tube 43 in sequence. Wire 2 and fire-resistant wire pass through the inside of the corresponding through hole 3 35 and conduit 38 in sequence. The wire core passes through the inside of through hole 4 63.

[0025] In this device, the drive unit can use a servo motor of the appropriate model. When the device is in use, the first wire is led out from the first wire reel 24, passes through the first channel 22 in the first shaft 21 and the second through hole 32 in the second shaft 31 in sequence, and finally comes out from the center of the insertion tube 43. At the same time, the second wires and refractory wires released by multiple second wire reels 37 pass through the third through hole 35 in the corresponding third shaft 34 and the corresponding wire tube 38 respectively. After being led out, all the second wires and refractory wires will pass through the corresponding wire holes 41 on the winch 4 in an orderly manner, and further cross through the various positioning holes 47 on the support plate 46, and finally connect to the outside of the first wire behind the pressure ring 44.

[0026] Subsequently, the drive mechanism connected to the rotating shaft 31 is activated, causing the rotating shaft 31 to rotate the fixed turntable 33. During the rotation of the turntable 33, multiple wire feeding frames 36 distributed around it rotate around the rotating shaft 31, allowing the released conductors 2 and fire-resistant wires to be orderly wound and twisted around the outside of the conductor 1 behind the pressure ring 44. During the twisting process, the electric push rod 45 is energized and activated, which can push the insertion tube 43 to drive the pressure ring 44 to reciprocate back and forth along the axial direction. The pressure ring 44 periodically pushes the conductors 2 and fire-resistant wires that are being twisted backward, achieving axial compaction of the wire core during the rotation and twisting process. This greatly reduces the gap between the bonding positions of the multiple conductors 2 and fire-resistant wires after twisting, thereby effectively improving the twisting density and structural integrity of the wire core after forming, and to a certain extent improving the mechanical strength and fire resistance of the formed cable.

[0027] In this device, the support plate 46 and its internal positioning hole 47 can play a key role in sorting and pre-positioning the second conductor and the fire-resistant wire in front of the twisting position. This helps to ensure that the second conductor and the fire-resistant wire are arranged in an orderly and neat manner before entering the final twisting position, and will not interfere with each other. The second conductor and the fire-resistant wire are twisted together on the outside of the first conductor to form a tight core, and are finally wound on the outside of the take-up drum 65.

[0028] In the process of manufacturing composite fire-resistant cables, the fire-resistant wires used must have the characteristics of high temperature resistance, heat insulation and certain flexibility. For example, continuous wires or yarns made of ceramic fibers (such as alumina, aluminum silicate fibers), mica-based composite wires or high-performance polymer flame-retardant fibers can be used. As a preferred option, composite wires made of high fire-resistant fibers and high-toughness fibers can be used to ensure fire resistance and flame insulation performance while enhancing the overall flexibility and tensile strength of the wires and facilitating stranding.

[0029] During the stranding process, the second conductor and the refractory wire are arranged alternately around the first conductor, forming an alternating wrapping state of one strand of the second conductor, one strand of the refractory wire, and another strand of the second conductor on the outside of the first conductor. The second conductor and the refractory wire have the same wire diameter. The refractory wire is used as one of the stranding elements and is arranged together with the second conductor on the rotating turntable 33 for synchronous wire feeding and stranding. Under this stranding method, the refractory wire can be evenly and tightly stranded and embedded between the layers of the first conductor and the second conductor, forming an integrated composite structure with the first conductor and the second conductor.

[0030] With tight twisting, the gap between conductor two and fire-resistant wire is effectively eliminated, which can effectively avoid the gap after conductor two is twisted with conductor one. This helps to avoid air and airflow channels inside the wire core. Moreover, in subsequent cable processing or in the event of a fire, these evenly distributed fire-resistant wires can more effectively play the roles of support, heat insulation and flame retardancy. This avoids the problem of uneven adhesion or thickness fluctuation that may occur when separately covering the fire-resistant layer later, making the fire resistance performance of the prepared composite fire-resistant cable more reliable and excellent.

[0031] In the specific implementation process, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, shaft 1 21 is rotatably connected to bearing 1 2, and shaft 4 62 is rotatably connected to bearing 3 61. Both shaft 1 21 and shaft 4 62 are externally connected to drive units. When the device is in use, the wire feed frame 1 23 is rotatably connected to bearing 1 2 via shaft 1 21, so that the device can drive the wire feed spool 1 24 inside the wire feed frame 1 23 to rotate around shaft 1 21 as the rotation axis via the drive unit. Similarly, the take-up frame 64 is rotatably connected to bearing 3 61 via shaft 4 62, so that the device can... The drive unit drives the take-up drum 65 inside the take-up frame 64 to rotate around the fourth rotating shaft 62. With the first rotating shaft 21 and the fourth rotating shaft 62 aligned on the same straight line, the device can achieve speed linkage control with the second rotating shaft 31, which generates the main twisting rotation, by means of the active rotation of the first pay-off frame 23 and the take-up frame 64. This can actively counteract the torsional stress accumulated in the core during the forming and transmission process, which helps prevent excessive twisting or loosening of the core and ensures the forming quality of the core after production.

[0032] In the specific implementation process, such as Figure 1 , Figure 2 and Figure 5 As shown, there are multiple turntables 33, which are connected in series and fixed on the second rotating shaft 31. There are four wire feeding frames 36 in the same turntable 33. The wire feeding frames 36 in the multiple turntables 33 are arranged radially and staggered. The third rotating shaft 34 is rotatably connected to the turntable 33 and is externally connected to a drive unit.

[0033] When in use, the device has multiple turntables 33, which can be set to two or three according to production needs. Multiple turntables 33 are connected in series and fixed on the rotating shaft 31 to load multiple wire feeding frames 36. This allows the device to increase the loading capacity of the wire feeding frames 36 by extending the axial dimension of the wire feeding mechanism, realizing the orderly twisting and feeding operation of multiple strands of conductors and multiple strands of fire-resistant wire. By extending the axial dimension to increase the loading capacity of the wire feeding frames 36, it is possible to avoid too many wire feeding frames 36 radially distributed inside the turntables 33, which would cause the wire feeding mechanism to become bulky. This is beneficial to ensuring the structural rationality of the wire feeding mechanism while increasing the number of wire feeding frames 36 installed.

[0034] In the second wire feeding mechanism, the second wire feeding frame 36 is rotatably connected to the turntable 33 via the third rotating shaft 34. This allows the device to drive the second wire feeding frame 36 to rotate around the third rotating shaft 34 via the drive unit. In conjunction with the rotation of the second rotating shaft 31, the turntable 33 is rotated. This allows the second wire feeding frame 36 to not only rotate around the third rotating shaft 34 but also revolve around the second rotating shaft 31. This allows for additional twist control of the wire during the stranding process, which is beneficial for improving the stranding tightness and roundness of the wire core after it is formed.

[0035] In the specific implementation process, such as Figure 4 , Figure 10 and Figure 11 As shown, a bracket 5 is fixedly installed on the support frame 1, located behind the stranding mechanism. A mold cylinder 51, which is aligned with the insertion tube 43, is fixedly installed on the bracket 5. A cylindrical air bladder 52 is fixedly installed inside the mold cylinder 51, and an air pump is connected to the outside of the cylindrical air bladder 52. The cylindrical air bladder 52 is located at the stranding position of conductor 1, conductor 2, and refractory wire. During the use of this device, when the pressure ring 44 periodically pushes the stranding conductor 2 and refractory wire for axial compression, a constant pressure gas can be injected into the cylindrical air bladder 52 inside the mold cylinder 51 by the air pump. This gas gently and evenly wraps around the outside of the newly formed wire core. During the axial compression of the wire core, radial restraint is applied to the wire core. This allows the device to perform three-dimensional compaction of the wire core during the rotational stranding process, which helps to further eliminate the gaps between conductor 1, conductor 2, and refractory wire, thereby further improving the density of the formed wire core.

[0036] In the specific implementation process, such as Figure 1 - Figure 3 , Figure 7 , Figure 8 and Figure 10As shown, an electric slide rail 66 is fixedly installed on the support frame 1, and a base 6 is fixedly installed on the sliding end of the electric slide rail 66. A second support 53 located behind the first support 5 is fixedly installed on the support frame 1, and a first conveyor wheel 54 symmetrically arranged vertically is rotatably installed on the second support 53. A third support 67 located in front of the third shaft seat 61 is fixedly installed on the base 6, and a second conveyor wheel 68 symmetrically arranged vertically is rotatably installed on the third support 67. Both the first conveyor wheel 54 and the second conveyor wheel 68 are externally connected to a drive unit, and the wire core passes sequentially between the two symmetrically arranged first conveyor wheel 54 and second conveyor wheel 68.

[0037] When the device is in use, the stranded wire core first passes through the clamping point formed by a pair of conveyor rollers 54 on the second bracket 53. The rotation of the conveyor rollers 54 provides a stable forward traction force for the wire core. The wire core then enters the clamping point formed by a pair of conveyor rollers 68 on the third bracket 67. The tension at this point is directly related to the winding speed. A vision sensor is installed on the outside of the wire core segment between the two clamping points. When the sensor detects that the wire core segment is abnormally rotating or swaying due to torque accumulation, the control system will immediately instruct the electric slide rail 66 to drive the base 6 and the entire winding mechanism to move back and forth appropriately. By dynamically adjusting the distance between these two tension control points, a variable buffer space is provided for the wire core to release rotational torque, effectively isolating the direct impact of the torque in the stranding area on the winding flatness and ensuring stable operation of the entire process.

[0038] Specifically, the working principle of this invention includes the following process: S1. Feeding and threading: Install the threading drum 24 containing wire 1 on the threading frame 23. Install the threading drum 37 containing wire 2 and refractory wire on each threading frame 36. Pass wire 1 through channel 22, through hole 32, and insert tube 43. Pass each wire 2 and refractory wire through the corresponding through hole 35, threading tube 38, threading hole 41, and positioning hole 47 on the support plate 46. Gather all wire ends at the twisting point behind the pressure ring 44 and pass them sequentially through the cylindrical air bladder 52 in the mold cylinder 51, between the two conveyor wheels 54, the two conveyor wheels 68, and through hole 63, and finally fix them on the take-up drum 65.

[0039] S2. Start-up and stranding: Start each drive unit and control system. The rotating shaft 31 drives the turntable 33 and winch 4 to rotate at a constant speed, so that all the wires 2 and refractory wires leading out from the wire hole 41 revolve around the wire 1. At the same time, the electric push rod 45 drives the pressure ring 44 to perform axial reciprocating motion according to the set frequency and stroke, periodically axially compacting the wire core formed at the stranding point. The air pump supplies air to the cylindrical air bag 52, causing it to expand appropriately, and radially wrapping and binding the wire core formed at the stranding point.

[0040] S3. Torque Management and Stable Conveying: After the wire core is formed, it is pulled out of the twisting point by the first conveyor wheel 54 and kept under a certain tension. The rotation of the first pay-off frame 23 is controlled to counteract the torque introduced by the first conductor. When the wire core passes through the monitoring area, the visual sensor provides real-time feedback. If the torque is detected to be too large, the control system adjusts the position of the take-up mechanism through the electric slide rail 66, changes the distance between the first conveyor wheel 54 and the second conveyor wheel 68, buffers the torque, and the second conveyor wheel 68 ensures that the wire core arrives at the take-up point with stable tension.

[0041] S4. Winding: The take-up drum 65 rotates under the drive to wind up the formed wire core. At the same time, the rotation speed and direction of the take-up frame 64 are precisely controlled and coordinated with the rotation of the first rotating shaft 21 and the second rotating shaft 31 to further absorb and eliminate the residual torque on the wire core, ensuring that the wire core is flat and tightly wound on the take-up drum 65, thus completing the entire stranding preparation process.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A core stranding device for preparing composite fire-resistant cables, comprising a support frame (1), characterized in that: The support frame (1) is sequentially equipped with a wire feeding mechanism 1, a wire feeding mechanism 2, a twisting mechanism, and a wire take-up mechanism. The wire feeding mechanism 1 includes a wire feeding drum 1 (24), which is used to release the wire 1. The wire feeding mechanism 2 includes a shaft seat 2 (3), and a rotating shaft 2 (31) is rotatably installed inside the shaft seat 2 (3). A through hole 2 (32) is opened inside the rotating shaft 2 (31). A turntable (33) is fixedly installed on the rotating shaft 2 (31), and multiple rotating shafts 3 (34) are installed inside the turntable (33). A wire feeding frame 2 (36) is fixedly installed on the rotating shaft 3 (34), and a wire feeding drum 2 (37) is rotatably installed inside the wire feeding frame 2 (36). Part of the wire feeding drum 2 (37) is used to release the wire 2, and part of the wire feeding drum 2 (37) is used to release the wire 2. The second wire release drum (37) is used to release the refractory wire. The twisting mechanism includes a winch (4) fixedly installed at the rear end of the second shaft (31), and multiple wire holes (41) are opened through the winch (4). A fixed tube (42) is fixedly installed at the rear end of the second shaft (31), and an insertion tube (43) is slidably inserted into the fixed tube (42). A pressure ring (44) is fixedly installed at the rear end of the insertion tube (43). An electric push rod (45) for controlling the forward and backward movement of the pressure ring (44) is fixedly installed in the second through hole (32). The first wire, the second wire and the refractory wire are twisted into a wire core behind the pressure ring (44). The take-up mechanism includes a take-up drum (65), and the wire core is wound on the take-up drum (65).

2. The core stranding device for preparing composite fire-resistant cables according to claim 1, characterized in that: The wire feeding mechanism also includes a bearing seat (2) fixedly installed on the support frame (1), and a rotating shaft (21) is installed inside the bearing seat (2). A wire feeding frame (23) is fixedly installed on the rotating shaft (21), and the wire feeding drum (24) is rotatably installed inside the wire feeding frame (23).

3. The core stranding device for preparing composite fire-resistant cables according to claim 2, characterized in that: The take-up mechanism also includes a base (6) mounted on a support frame (1), and a bearing seat three (61) is fixedly mounted on the base (6). A rotating shaft four (62) is installed inside the bearing seat three (61), and a take-up frame (64) is fixedly mounted on the rotating shaft four (62). The take-up drum (65) is rotatably mounted inside the take-up frame (64).

4. The core stranding device for preparing composite fire-resistant cables according to claim 3, characterized in that: The first rotating shaft (21), the second rotating shaft (31), and the fourth rotating shaft (62) are on the same straight line. The first rotating shaft (21) has a channel (22) and the third rotating shaft (34) has a through hole (35). Multiple conduits (38) are fixedly installed on the turntable (33). The fourth rotating shaft (62) has a through hole (63). The first wire passes through the first channel (22), the second through hole (32), and the insert (43) in sequence. The second wire and the fire-resistant wire pass through the corresponding through hole (35) and the conduit (38) in sequence. The wire core passes through the through hole (63).

5. The core stranding device for preparing composite fire-resistant cables according to claim 4, characterized in that: The first rotating shaft (21) is rotatably connected to the first bearing seat (2), and the fourth rotating shaft (62) is rotatably connected to the third bearing seat (61).

6. The core stranding device for preparing composite fire-resistant cables according to claim 1, characterized in that: Multiple turntables (33) are provided, and multiple turntables (33) are connected in series and fixed on the second rotating shaft (31). Four wire feeding frames (36) are provided in the same turntable (33). The wire feeding frames (36) in the multiple turntables (33) are arranged radially and staggered. The third rotating shaft (34) is rotatably connected to the turntable (33).

7. The core stranding device for preparing composite fire-resistant cables according to claim 1, characterized in that: The rear end of the fixed tube (42) is fixedly installed with a support plate (46), and the support plate (46) has multiple positioning holes (47) arranged around it. The second conductor and the fire-resistant wire pass through the multiple positioning holes (47) in an alternating manner.

8. The core stranding device for preparing composite fire-resistant cables according to claim 1, characterized in that: The support frame (1) is fixedly installed with a bracket (5) located behind the twisting mechanism, and a mold cylinder (51) located on the same straight line as the insertion tube (43) is fixedly installed on the bracket (5). A cylindrical airbag (52) is fixedly installed inside the mold cylinder (51), and an air pump is connected to the cylindrical airbag (52).

9. The core stranding device for preparing composite fire-resistant cables according to claim 3, characterized in that: An electric slide rail (66) is fixedly installed on the support frame (1), and the base (6) is fixedly installed on the sliding end of the electric slide rail (66).

10. The core stranding device for preparing composite fire-resistant cables according to claim 9, characterized in that: The support frame (1) is fixedly installed with a second bracket (53) located behind the first bracket (5), and a first conveyor wheel (54) symmetrically arranged vertically is rotatably installed on the second bracket (53). The base (6) is fixedly installed with a third bracket (67) located in front of the third shaft seat (61), and a second conveyor wheel (68) symmetrically arranged vertically is rotatably installed on the third bracket (67). The wire core passes sequentially between the two symmetrically arranged first conveyor wheel (54) and second conveyor wheel (68).

Images