Preparation method and production line of electric tracing band with internal nodes

Abstract

The invention relates to the technical field of electric tracing band preparation, in particular to a preparation method of an electric tracing band with internal nodes and a production line of the electric tracing band with the internal nodes, an inner combination layer of the electric tracing band is prepared by extruding an inner insulating layer on the outer layer of a parallel paired conductor wire core, and two-side alternate digging processing is performed on the inner combination layer at fixed intervals, so that the electric tracing band with the internal nodes is prepared. The outer layer of the inner combined layer is spirally wound with a heating wire, the heating wire is wound at a fixed pitch on the inner combined layer far away from the digging opening, the heating wire is wound at a dense pitch on the digging opening, and the dense winding wire is in close contact with the exposed conductor wire core to form a dense node in the electric tracing band, so that additional manual spot welding operation at the digging opening is not needed; the preparation process is simpler and more convenient, on one hand, full contact and stable connection of the heating wire and the conductor wire core are guaranteed through the encrypted winding wire, on the other hand, compared with traditional welding treatment, encrypted nodes are more suitable for large-degree or frequency bending use, and further safe use and stable heating effect are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating tape preparation, and in particular to a preparation method and a production line of an electric heating tape with internal nodes. Background Art

[0002] The current electric heating tape is produced and prepared in the process, for example, the electric heating tape and its manufacturing method disclosed in Chinese patent document CN104159344A, the electric heating tape comprises an inner insulating layer and an outer insulating layer, the inner insulating layer is coated with a plurality of parallel energized busbars, the surface of the inner insulating layer is provided with incisions at intervals along the length direction, the surface of the inner insulating layer is wound with electric heating wires, the energized busbars at the incisions are in contact with the electric heating wires, the outer insulating layer covers the electric heating wires and the inner insulating layer, specifically, the inner insulating layer is formed by injection molding outside the energized busbars, the incisions are made and the breakdown points are removed, and the wires are wound to make the energized busbars The electric busbar contacts the electric heating wire at the incision, and is injected again to form an outer insulation layer, which is suitable for large-scale mass production. However, in actual preparation, manual digging is mostly adopted, and then high-temperature solder is used for manual spot welding at the intersection of the wound heating wire and the incision to increase the welding contact area to achieve the purpose of stable parallel connection. The traditional manual welding method, although the welding is stable, increases the manual operation process, is time-consuming and labor-intensive, and the finished heating tape should not be excessively bent at the welding node. Excessive or frequent bending can easily lead to solder joint breakage, affecting the safety of use and heating effect. Summary of the invention

[0003] In view of this, the purpose of the present invention is to propose a method for preparing an electric heating tape with internal nodes and a production line thereof, so as to solve the problem that when preparing the electric heating tape with internal nodes in the prior art, the welding operation is time-consuming and labor-intensive, and the welding points should not be bent excessively or frequently.

[0004] Based on the above purpose, the present invention provides a method for preparing an electric heating tape with internal nodes, comprising the following steps:

[0005] The conductor cores are fed into an extrusion device in pairs and in parallel, and an inner insulating layer is formed on the outer layer of the parallel pairs of conductor cores to obtain an inner composite layer of the electric heating cable;

[0006] Alternately cut out the inner composite layer at fixed intervals on both sides, so that the conductor core on one side of the cutout of the inner composite layer is exposed;

[0007] The inner composite layer after the cutout is conveyed into the wrapping equipment, and a heating wire is spirally wound on the outer layer of the inner composite layer, wherein the wire is wound with a fixed pitch away from the cutout position on the inner composite layer, and the wire is wound with a dense pitch at the cutout position on the inner composite layer. The dense wire is in close contact with the exposed conductor core to form a dense node in the electric heating tape.

[0008] Preferably, a wire diameter measuring device is provided on the outside of the wrapping device. When the wire diameter measuring device senses a sudden change in the wire diameter of the inner combined layer, the wrapping device is triggered to perform denser wire winding at the corresponding cutout position.

[0009] Preferably, an outer insulating layer is extruded on the outer layer of the inner composite layer after the wire winding, and an outer sheath layer is coated on the outer side of the outer insulating layer.

[0010] Preferably, the outer insulating layer at the cutout position is blackened, and during the coating preparation, the blackened position is identified and a code mark is sprayed on the corresponding position of the outer sheath layer.

[0011] The present invention also provides a production line of an electric heating tape with internal nodes, comprising a wrapping device for spirally wrapping a heating wire, a traction device is provided on the outlet side of the wrapping device, a wire feeding device is provided on the inlet side of the wrapping device, and a wire diameter measuring device for measuring the wire diameter of the wire is provided on the wire feeding device:

[0012] A wire winding chamber is provided in the wrapping equipment, and a wire feeding channel is transversely provided in the wire winding chamber. A wire pay-off reel is rotatably connected to the wire feeding side of the wire winding chamber close to the wire feeding side, and a heating wire is wound on the wire pay-off reel. A wire winding reel is provided at a position of the wire winding reel away from the wire feeding side, and the wire winding reel is rotatably connected to the wire winding chamber. A wire guiding device is provided on the wire winding reel. The wire feeding channel penetrates into the wire winding chamber along the central axis of the wire pay-off reel and the wire winding reel, and is located on the outside of the wire winding reel in an exposed state. The heating wire is paid off by rotating the wire pay-off reel, and is guided to the outside of the wire winding reel through the wire guiding device, and is used to spirally wind the heating wire onto the exposed inner combined layer through the axial rotation of the wire winding reel.

[0013] Preferably, an inner turntable is provided at a position of the pay-off reel near its wire inlet side, and the wire guiding device includes a wire guiding rod connected between the inner turntable and the wire winding reel, the wire guiding rod is arranged parallel to the axial direction of the inner turntable and the wire winding reel, and is located at the outer edge of the inner turntable and the wire winding reel, and the wire winding reel is driven by the inner turntable to rotate synchronously axially, a first wire guiding cylinder is detachably connected to the wire guiding rod, and a first wire guiding roller is provided at the outer edge of the wire winding reel, and the heating wire is guided to the outside of the wire winding reel via the first wire guiding cylinder and the first wire guiding roller in sequence.

[0014] Preferably, a tension rod is connected between the inner turntable and the wire winding disk. The tension rod is arranged parallel to the wire guide rod. The two ends of the tension rod are rotatably connected to the inner side of the wire winding disk and the outer side of the inner turntable respectively. The heating wire for pay-off is guided to the outer side of the wire winding disk via the tension rod, the first wire guide tube and the first wire guide roller in sequence. The tension rod is rotated away from or close to the pay-off disk to trigger the adjustment of the rotation and pay-off speed of the pay-off disk, which is used to automatically adjust the pay-off tension.

[0015] Preferably, a wire guide seat is also provided on the outer side of the wire winding disk, a second wire guide roller is provided at one end of the wire guide seat, and a second wire guide cylinder is provided at the other end, the second wire guide cylinder is designed with a hollow structure, the heating wire is sequentially wound on the inner combined layer through the second wire guide roller and the hollow interior of the second wire guide cylinder, a rotating plate is rotatably connected at a relative position of the wire guide seat in the wire winding disk, an electromagnetic inner ring and an electromagnetic outer ring are provided on the rotating plate, a first connecting column is connected to the bottom end surface of the wire guide seat, the bottom end of the first connecting column is penetrated and connected to the wire winding disk, and a first reset elastic member is connected to the wire winding disk, a second connecting column is connected to the bottom end surface of the second wire guide cylinder, the second connecting column is penetrated and connected to A second reset elastic member is provided on the wire guide seat and connected to the wire guide seat. The bottom end of the second connecting column is inserted into the wire winding disk. When the wire winding is accelerated by the wire winding disk, the electromagnetic inner ring and the electromagnetic outer ring are triggered to be energized. At the same time, the rotating plate starts to rotate. The bottom end of the second connecting column is adsorbed by the electromagnetic outer ring, driving the second wire guide cylinder to move laterally close to the wire winding disk. At the same time, the heating wire starts to be wound densely until the dense winding is completed. The electromagnetic outer ring rotates and moves away from the second connecting column. At the same time, the electromagnetic inner ring rotates to the position of the first connecting column, and drives the wire guide seat to move laterally close to the wire winding disk. As the electromagnetic inner ring rotates and moves away from the first connecting column, the electromagnetic inner ring and the electromagnetic outer ring are powered off, and the rotating plate rotates and resets.

[0016] Preferably, a driving gear is connected to one side of the rotating plate, and an outer gear ring is provided at the outer ring of the rotating plate, and is meshed and connected with the driving gear through the outer gear ring.

[0017] Preferably, a laser wire stripping machine is also included to perform alternate cutting processing on both sides of the inner combination layer.

[0018] The beneficial effects of the present invention are as follows: an inner insulating layer is formed by extruding the outer layers of parallel paired conductor cores to obtain an inner composite layer of the electric heating tape, and alternating notches are performed on both sides of the inner composite layer at fixed intervals, a heating wire is spirally wound on the outer layer of the inner composite layer, and the wire is wound with a fixed pitch away from the notch position on the inner composite layer, and the notch position on the inner composite layer is wound with a dense pitch, the dense wire winding is in close contact with the exposed conductor core to form a dense node in the electric heating tape, and there is no need to perform additional manual spot welding at the notch, and the preparation process is simpler. The dense wire winding, on the one hand, ensures that the heating wire is fully in contact and stably connected with the conductor core, and on the other hand, compared with traditional welding processing, the dense node is more suitable for bending to a greater degree or frequency, which is conducive to further safe use and stable heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the wrapping equipment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the inner combination layer after the cutout of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the inner combined layer after the wire winding of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the inner composite layer after the outer insulating layer is extruded in the present invention;

[0024] Figure 5 It is a schematic diagram of the internal structure of the wire winding chamber of the present invention;

[0025] Figure 6 For the present invention Figure 5 The enlarged schematic diagram of point A in the middle;

[0026] Figure 7 It is a structural schematic diagram of the rotating plate in the initial state of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the second wire guide drum of the present invention;

[0028] Fig. 9 It is a schematic diagram of the internal structure of the wire winding chamber when the dense wire winding starts in the present invention;

[0029] Fig.10 It is a schematic diagram of the internal structure of the wire winding chamber when the dense wire winding in the present invention is just completed;

[0030] Fig.11 It is a schematic diagram of the structure of the rotating plate when the dense winding of the wire in the present invention is just completed.

[0031] The markings in the figure are:

[0032] 100, conductor core; 200, inner insulation layer; 300, heating wire; 400, encryption node; 500, outer insulation layer; 1, wrapping equipment; 2, wire diameter measuring device; 3, traction equipment; 31, wire reel; 32, wire reel; 4, wire winding chamber; 5, wire feeding channel; 6, wire pay-off reel; 7, wire winding reel; 8, wire guide device; 81, wire guide rod; 82, first wire guide drum; 83, first wire guide roller; 9, inner turntable; 10, tension rod; 11, connecting rod; 12, wire guide seat; 13, second wire guide roller; 14, second wire guide drum; 15, rotating plate; 151, electromagnetic inner ring; 152, electromagnetic outer ring; 16, first connecting column; 17, first reset elastic member; 18, second connecting column; 19, second reset elastic member; 20, driving gear. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] A method for preparing an electric heating cable having an internal node comprises the following steps:

[0036] The conductor cores 100 are fed into an extrusion device in pairs and in parallel, and an inner insulating layer 200 is formed on the outer layer of the parallel pairs of conductor cores 100 to obtain an inner composite layer of the electric heating cable;

[0037] Alternately cut out the inner composite layer at fixed intervals on both sides, so that the conductor core 100 on one side of the cutout of the inner composite layer is exposed;

[0038] The inner composite layer after the cutout is conveyed into the wrapping device 1, and the heating wire 300 is spirally wound on the outer layer of the inner composite layer, wherein the wire is wound with a fixed pitch away from the cutout position on the inner composite layer, and the wire is wound with a dense pitch at the cutout position on the inner composite layer. The dense wire winding is in close contact with the exposed conductor core 100 to form a dense node 400 in the electric heating tape.

[0039] The conductor cores 100 are fed into the extrusion equipment in pairs in parallel. Two conductor cores 100 are arranged in parallel, and conventional copper wires can be used. The extrusion equipment can use conventional extruders. The outer layer of the conductor core 100 is extruded to form an inner insulating layer 200. The inner composite layer is alternately cut at fixed intervals along its length direction, so that the conductor core 100 on one side of the cutout of the inner composite layer is exposed. Figure 2As shown, the conductor cores 100 on different sides of the adjacent cutouts are exposed, and the conductor core 100 on one side of the cutout can be completely exposed or partially exposed. The inner combined layer cable after the cutout is then transferred to the wrapping device 1, and the outer layer of the inner combined layer is spirally wound with a heating wire 300. The wrapping device 1 can adopt existing conventional tape wrapping machines, wire winding machines and other equipment, wherein, Figure 3 As shown, the wire is wound with a fixed pitch at a location on the inner composite layer away from the cutout, i.e., the spiral pitch of the wire winding at the non-cutout location is fixed and relatively loose, while the wire is wound with a dense pitch at the cutout location, i.e., the same spiral winding but with a very small spiral pitch, i.e., the wire winding is very dense, forming a dense node 400 in the electric heating tape, thereby the dense wire winding is in close contact with the exposed conductor core 100, without the need for additional manual spot welding at the cutout, and the preparation process is simpler. The dense wire winding, on the one hand, ensures that the heating wire 300 is in full contact and stably connected with the conductor core 100, and on the other hand, compared with traditional welding processing, the dense node 400 is more suitable for bending to a greater degree or frequency, which is conducive to further safe use and stable heating effect.

[0040] In an embodiment of the present invention, Figure 1 As shown, a wire diameter measuring device 2 is provided on the outside of the wrapping device 1, wherein the wire diameter measuring device 2 can adopt an existing conventional wire diameter measuring instrument. When the wire diameter measuring device 2 senses a sudden change in the wire diameter of the inner combined layer, it indicates that the digging position is sensed. At this time, a signal is sent to the wrapping device 1 through the wire diameter measuring device 2. Since the transmission speed of the inner combined layer cable is fixed and known, the wrapping device 1 can be controlled to start densely winding the wire at the digging position after a fixed time, thereby realizing that the wrapping device 1 automatically encrypts the wire winding at the corresponding digging position.

[0041] In an embodiment of the present invention, Figure 4 As shown, an outer insulating layer 500 is extruded on the outer layer of the inner composite layer after the wire winding, and an outer sheath layer is coated on the outer side of the outer insulating layer 500, thereby preparing an electric heating cable with internal nodes.

[0042] In an embodiment of the present invention, Figure 4 As shown, the outer insulating layer 500 at the excavation position is blackened. During the coating preparation, the blackened position is identified and spray-coded at the corresponding position of the outer sheath layer, so that the internal node position of the electric heating tape can be easily known during actual use and maintenance.

[0043] The present invention also provides a production line of an electric heating cable having an internal node, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, it includes a wrapping device 1 for spirally winding a heating wire 300, and a traction device 3 is provided on the outlet side of the wrapping device 1, wherein the traction device 3 may include a take-up drum 31, and a take-up wheel 32 is provided on one side of the take-up drum 31. The inner combined layer cable after the wire is wound is rotated and reeled by the take-up drum 31 through the take-up wheel 32, and the wire is pulled out at a fixed speed by the take-up drum 31. A wire feeding device is provided on the inlet side of the wrapping device 1, and the wire feeding device can adopt an existing conventional unwinding drum, which is used to rotate and unwind the inner combined layer cable to be wound, and a wire diameter measuring device 2 for measuring the wire diameter of the wire is also provided on the wire feeding device;

[0044] In particular, such as Figure 1 , Figure 5 , Figure 6 As shown, a winding chamber 4 is provided in the wrapping device 1, a wire feeding channel 5 is transversely provided in the winding chamber 4, a wire pay-off drum 6 is rotatably connected to the wire feeding side of the winding chamber 4, a heating wire 300 is wound on the wire pay-off drum 6, a wire winding drum 7 is provided at a position of the wire pay-off drum 6 away from the wire feeding side, the wire winding drum 7 is rotatably connected to the winding chamber 4, a wire guiding device 8 is provided on the wire winding drum 7, and the wire feeding channel 5 penetrates into the winding chamber 4 along the central axis position of the wire pay-off drum 6 and the wire winding drum 7, that is, the central axis position of the wire pay-off drum 6 and the wire winding drum 7 is designed as a hollow structure for feeding and feeding The wire channel 5 is passed through, and the wire feeding channel 5 is fixed in the wire winding cavity 4, and the part located on the outer side of the wire winding drum 7 is in an exposed state, that is, the inner combined layer cable is fed into the wire winding cavity 4 through the wire feeding channel 5, and is pulled and transmitted at a stable speed. The heating wire 300 is paid out by the pay-off drum 6, and then guided to the outer side of the wire winding drum 7 by the wire guiding device 8. Through the axial rotation of the wire winding drum 7, the heating wire 300 is spirally wound on the exposed inner combined layer. When the axial rotation speed of the wire winding drum 7 is accelerated, the dense wire winding is achieved at the corresponding digging position.

[0045] In an embodiment of the present invention, Figure 1 , Figure 5 , Figure 6 , Fig. 9 As shown, an inner turntable 9 is provided at a position of the pay-off reel 6 near its inlet side, and the wire guiding device 8 includes a wire guiding rod 81 connected between the inner turntable 9 and the wire winding reel 7, and the wire guiding rod 81 is arranged parallel to the axial direction of the inner turntable 9 and the wire winding reel 7, and is located at the outer edge of the inner turntable 9 and the wire winding reel 7, so that the wire winding reel 7 is driven to rotate axially through the inner turntable 9, and a first wire guiding cylinder 82 is detachably connected to the wire guiding rod 81, and a first wire guiding roller 83 is provided at the outer edge of the wire winding reel 7. Specifically, as shown in FIG. Fig. 9As shown, the wire guide rod 81 can be detachably connected to a clamping block by bolts or the like, and the clamping block is rotatably connected to the first wire guide tube 82. The two ends of the wire guide rod 81 can also be detachably connected to the inner turntable 9 and the wire winding disk 7 by bolts or the like, respectively. The heating wire 300 is guided from the outside of the first wire guide tube 82 and the outside of the first wire guide roller 83 to the outside of the wire winding disk 7 in sequence, wherein the wire guide rod 81 and the first wire guide tube 82 can be provided in plurality.

[0046] In an embodiment of the present invention, Figure 1 , Figure 5 , Figure 6 , Fig. 9 As shown, a tension rod 10 is connected between the inner turntable 9 and the wire winding disk 7. The tension rod 10 is arranged parallel to the wire guide rod 81. The two ends of the tension rod 10 are rotatably connected to the inner side of the wire winding disk 7 and the outer side of the inner turntable 9, respectively. Specifically, as shown in FIG. Fig. 9 As shown, the inner side of the wire winding disk 7 and the outer side of the inner rotating disk 9 are rotatably connected with connecting rods 11, and elastic components such as torsion springs can be provided at the rotating connection. The two ends of the tension rod 10 are rotatably connected with one end of the connecting rods 11 on both sides, and the heating wire 300 for paying out is guided to the outer side of the wire winding disk 7 by the tension rod 10, the first wire guide cylinder 82, and the first wire guide roller 83 in sequence, so that the tension rod 10 is rotated away from or close to the wire pay-off disk 6 to adaptively adjust the wire pay-off tension of the heating wire 300, wherein the wire pay-off disk 6 and the wire winding disk 7 can be driven to rotate separately by the driving device in the wire winding cavity 4. More preferably, on the inner side of the wire winding disk 7 or the outer side of the inner rotating disk 9 A sensor may be provided on the side, and the sensor may be an existing conventional angle sensor or distance sensor, etc., for sensing the rotation angle or position of the connecting rod 11, and for judging the degree to which the tension rod 10 rotates away from or close to the pay-off reel 6, thereby triggering the adjustment of the rotation and wire-paying speed of the pay-off reel 6. For example, when the tension rod 10 rotates away from the pay-off reel 6, the wire feeding distance guided by the tension rod 10, the first wire guide tube 82, and the first wire guide roller 83 to the outside of the wire winding reel 7 becomes longer, indicating that the tension becomes smaller, which can trigger the adjustment of the rotation and wire-paying speed of the pay-off reel 6 to decrease, and vice versa, it can trigger the adjustment of the rotation and wire-paying speed of the pay-off reel 6 to increase, thereby realizing further automatic adjustment of the pay-off tension.

[0047] In an embodiment of the present invention, Figure 1 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11As shown, a wire guide seat 12 is also provided on the outer side of the wire winding disk 7, a second wire guide roller 13 is provided on one end of the wire guide seat 12, and a second wire guide cylinder 14 is provided on the other end. The second wire guide cylinder 14 is designed with a hollow structure, and the heating wire 300 is wound on the inner combination layer in sequence through the second wire guide roller 13 and the second wire guide cylinder 14. A rotating plate 15 is rotatably connected at a relative position of the wire guide seat 12 in the wire winding disk 7, and an electromagnetic inner ring 151 and an electromagnetic outer ring 152 are provided on the rotating plate 15. A first connecting column 16 is connected to the bottom end surface of the wire guide seat 12, and the bottom end of the first connecting column 16 is penetrated and connected to the wire winding disk 7, and is connected to the wire winding disk 7. A first reset elastic member 17, a second connecting column 18 is connected to the bottom end surface of the second wire guide cylinder 14, the second connecting column 18 is connected to the wire guide seat 12, and a second reset elastic member 19 is connected to the wire guide seat 12, and the bottom end of the second connecting column 18 is inserted into the wire winding disk 7, wherein the first reset elastic member 17 and the second reset elastic member 19 can both adopt existing conventional springs and other elastic components, the electromagnetic inner ring 151 and the electromagnetic outer ring 152 can both adopt existing conventional electromagnets, electromagnetic coils and other electromagnetic components, and an elastic component such as a torsion spring can be connected between the rotating plate 15 and the wire winding disk 7 to drive the rotating plate 15 to rotate and reset;

[0048] Considering that the excavation of the inner composite layer is unlikely to be a regular rectangular shape, e.g. Figure 2 , Figure 3 , Figure 4 As shown, the edge of the cutout may be a trapezoidal or arc-shaped transition. In this regard, the wire diameter measuring device 2 begins to sense the sudden change in wire diameter and controls the wrapping device 1 to start winding the wire densely at the cutout position after a fixed time. Figure 7 , Fig. 9 As shown, the electromagnetic inner ring 151 and the electromagnetic outer ring 152 are first triggered to be energized, and the rotating plate 15 starts to rotate at the same time, and the electromagnetic outer ring 152 adsorbs the bottom end of the second connecting column 18, driving the second wire guide cylinder 14 to move horizontally close to the wire winding disk 7. At this time, the wire winding position is driven to move backward, which is equivalent to crossing the transition position of the edge of the excavation, and directly winding the wire at the regular position in the excavation. On the other hand, the wire winding diameter in the excavation is smaller than the wire winding diameter outside the excavation, and the second wire guide cylinder 14 moves horizontally relative to the second wire guide roller 13, and the wire guiding distance is lengthened, which is equivalent to automatically adjusting the wire guide tension to adapt to the smaller wire winding diameter in the excavation.

[0049] The heating wire 300 begins to be densely wound until the dense winding is completed. Fig.10 , Fig.11As shown, at this time, the electromagnetic outer ring 152 rotates and moves away from the second connecting column 18, and the electromagnetic inner ring 151 rotates to the position of the first connecting column 16, and drives the wire guide seat 12 to move horizontally close to the wire winding disk 7, that is, the wire winding position is driven to move backward, and crosses the edge transition position on the other side of the excavation, and directly performs regular wire winding outside the excavation, and the second wire guide cylinder 14 moves back and resets relative to the second wire guide roller 13, and the wire guide distance also returns to normal, and the wire guide tension is automatically adjusted to adapt to the wire winding diameter outside the excavation. As the electromagnetic inner ring 151 rotates and moves away from the first connecting column 16, the electromagnetic inner ring 151 and the electromagnetic outer ring 152 are powered off, and the rotating plate 15 rotates and resets. Figure 5 , Figure 7 As shown, it returns to its initial state, and when waiting for the next dense wire winding, the electromagnetic inner ring 151 and the electromagnetic outer ring 152 are energized and the turn plate 15 is rotated. This avoids irregular wire winding at the edge of the cutout, making it more beautiful, and prevents the wire winding from slipping and shifting at the edge, which in turn causes the nearby wire winding to become loose and unstable, affecting the stability of the connection. On the other hand, the tension inside and outside the cutout is automatically fine-tuned in real time, which is further beneficial to the stability of the wire feeding tension, avoiding wire breakage, as well as tight wire winding and stable connection. Therefore, by adjusting the tension through real-time feedback of the tension rod 10, adaptive adjustment of the tension at the wire feeding end within a larger range can be achieved, and by the coordinated displacement of the wire guide seat 12 and the second wire guide tube 14, regular wire winding and adaptive instant fine-tuning of the tension at the wire outlet end can be achieved in the connecting section of the dense wire winding, which is more beneficial to stable and regular wire winding.

[0050] Among them, the more preferred one is that a cleaning surface layer is provided on the hollow inner wall of the second wire guide tube 14 for cleaning the inserted heating wire 300. In addition, through the attraction of the electromagnetic inner ring 151 and the electromagnetic outer ring 152, the bottom ends of the first connecting column 16 and the second connecting column 18 are laterally moved close to but not necessarily directly abutted against the rotating plate 15. Through the elastic action of the first reset elastic member 17 and the second reset elastic member 19, the wire feeding tension is adaptively fine-tuned. At the same time, the bottom ends of the first connecting column 16 and the second connecting column 18 may also be provided with balls. Even when the bottom ends of the first connecting column 16 and the second connecting column 18 abut against the rotating plate 15, they can efficiently roll on the rotating plate 15 through the balls.

[0051] In an embodiment of the present invention, Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, a driving gear 20 is connected to one side of the rotating plate 15, and an outer gear ring is provided at the outer ring of the rotating plate 15, and is meshed with the driving gear 20 through the outer gear ring, so that the rotating plate 15 is driven to rotate through the driving gear 20. Specifically, the driving gear 20 can be driven and connected through driving components such as a rotating cylinder and a motor on the inner side of the wire winding disk 7. Considering that the driving components including the electromagnetic ring only need intermittent and short-term power supply and have low energy consumption, it is completely possible to power it through connections such as energy storage batteries on the inner side of the wire winding disk 7. The wire diameter measuring device 2 senses the sudden change in the wire diameter of the inner combined layer, and sends a signal to the winding equipment 1, while triggering the driving components including the electromagnetic ring to act synchronously.

[0052] Among them, Figure 7 As shown, the arc length of the electromagnetic outer ring 152 is fixed, and the electromagnetic inner ring 151 is located at the inner ring at the end of the electromagnetic outer ring 152, and the arc length is shorter. Since the transmission speed of the inner combined layer cable is fixed and known, it is only necessary to control the rotation speed of the driving gear 20 so that during the time when the wire winding disk 7 accelerates the winding, the bottom end of the second connecting column 18 just rotates completely along the electromagnetic outer ring 152. When the transmission speed of the inner combined layer cable is adjusted, it is only necessary to adjust the rotation speed of the driving gear 20 accordingly.

[0053] In an embodiment of the present invention, a laser wire stripper is also included for alternately cutting out both sides of the inner combination layer, wherein two laser wire strippers may be arranged at intervals, a fixed tooling is arranged inside the laser wire stripper, the inner combination layer passes through the fixed tooling and is transmitted horizontally, and only a fixed notch needs to be opened on the fixed tooling, and laser heads are arranged at the upper and lower ends of the fixed notch in the laser wire stripper, thereby achieving alternate cutting out both sides of the inner combination layer.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

Claims

1. A method for preparing an electric heating cable having internal nodes, characterized in that: The steps include: The conductor cores (100) are fed into an extrusion device in pairs and in parallel, and an inner insulating layer (200) is formed by extruding the outer layers of the parallel pairs of conductor cores (100) to obtain an inner composite layer of the electric heating cable; Performing alternating cutouts on both sides of the inner assembly layer at fixed intervals, so that the conductor core (100) on one side of the cutout of the inner assembly layer is exposed; The inner composite layer after the cutout is conveyed into a wrapping device (1), and a heating wire (300) is spirally wound on the outer layer of the inner composite layer, wherein the wire is wound with a fixed pitch away from the cutout position on the inner composite layer, and the wire is wound with a dense pitch at the cutout position on the inner composite layer, and the dense wire is in close contact with the exposed conductor core (100), forming a dense node (400) in the electric heating tape.

2. The method for preparing an electric heating tape with internal nodes according to claim 1, characterized in that: A wire diameter measuring device (2) is provided on the outside of the wrapping device (1). When the wire diameter measuring device (2) senses a sudden change in the wire diameter of the inner combined layer, the wrapping device (1) is triggered to perform denser wire winding at the corresponding cutout position.

3. The method for preparing an electric heating tape with internal nodes according to claim 1, characterized in that: An outer insulating layer (500) is extruded on the outer layer of the inner combined layer after the wire winding, and an outer sheath layer is coated on the outer side of the outer insulating layer (500).

4. The method for preparing an electric heating cable with internal nodes according to claim 3, characterized in that: The outer insulating layer (500) at the cutout position is blackened, and during the coating preparation, the blackened position is identified and a code mark is sprayed on the corresponding position of the outer sheath layer.

5. A production line of an electric heating tape with internal nodes, the production line is produced by the preparation method of the electric heating tape with internal nodes according to any one of claims 1 to 4, comprising a wrapping device (1) for spirally winding a heating wire (300), a traction device (3) is provided on the outlet side of the wrapping device (1), a wire feeding device is provided on the inlet side of the wrapping device (1), and a wire diameter measuring device (2) is provided on the wire feeding device for measuring the wire diameter of the wire feeding, characterized in that: The wrapping device (1) is provided with a wire winding chamber (4), a wire feeding channel (5) is transversely provided in the wire winding chamber (4), a wire pay-off drum (6) is rotatably connected to the wire feeding side of the wire winding chamber (4), a heating wire (300) is wound on the wire pay-off drum (6), a wire winding drum (7) is provided at a position of the wire pay-off drum (6) away from the wire feeding side, the wire winding drum (7) is rotatably connected to the wire winding chamber (4), and a heating wire (300) is wound on the wire winding drum (6). A wire guide device (8) is provided, and a wire feeding channel (5) penetrates into the wire winding cavity (4) along the central axis of the wire pay-off reel (6) and the wire winding reel (7), and is located outside the wire winding reel (7) in an exposed state. The heating wire (300) is paid out by rotating the wire pay-off reel (6), and is guided to the outside of the wire winding reel (7) through the wire guide device (8), and is used to spirally wind the heating wire (300) onto the exposed inner composite layer through the axial rotation of the wire winding reel (7).

6. A production line of an electric heating cable with internal nodes according to claim 5, characterized in that: The pay-off reel (6) is provided with an inner rotating disc (9) at a position close to the wire inlet side thereof, and the wire guiding device (8) comprises a wire guiding rod (81) connected between the inner rotating disc (9) and the wire winding reel (7), the wire guiding rod (81) being arranged parallel to the axial direction of the inner rotating disc (9) and the wire winding reel (7), and being located at the outer edge of the inner rotating disc (9) and the wire winding reel (7), and driving the wire winding reel (7) to synchronously rotate axially through the inner rotating disc (9), a first wire guiding cylinder (82) being detachably connected to the wire guiding rod (81), a first wire guiding roller (83) being provided at the outer edge of the wire winding reel (7), and the heating wire (300) being guided to the outer side of the wire winding reel (7) via the first wire guiding cylinder (82) and the first wire guiding roller (83) in sequence.

7. A production line of an electric heating cable with internal nodes according to claim 6, characterized in that: A tension rod (10) is connected between the inner turntable (9) and the wire winding disk (7), and the tension rod (10) is arranged parallel to the wire guide rod (81). The two ends of the tension rod (10) are rotatably connected to the inner side of the wire winding disk (7) and the outer side of the inner turntable (9), respectively. The heating wire (300) for paying out is guided to the outer side of the wire winding disk (7) via the tension rod (10), the first wire guide cylinder (82), and the first wire guide roller (83) in sequence. The tension rod (10) rotates away from or close to the pay-off disk (6), triggering the adjustment of the rotation pay-off speed of the pay-off disk (6), so as to automatically adjust the pay-off tension.

8. The production line of an electric heating cable with internal nodes according to claim 5, characterized in that: The outer side of the wire winding disk (7) is also provided with a wire guide seat (12), one end of the wire guide seat (12) is provided with a second wire guide roller (13), and the other end is provided with a second wire guide cylinder (14), the second wire guide cylinder (14) is designed with a hollow structure, the heating wire (300) is sequentially passed through the second wire guide roller (13) and the second wire guide cylinder (14) and wound on the inner combination layer, and a rotating plate (12) is rotatably connected at a relative position of the wire guide seat (12) in the wire winding disk (7). 15), an electromagnetic inner ring (151) and an electromagnetic outer ring (152) are provided on the rotating plate (15), a first connecting column (16) is connected to the bottom end surface of the wire guide seat (12), the bottom end of the first connecting column (16) is connected to the wire winding disk (7), and a first reset elastic member (17) is connected between the first connecting column (16) and the wire winding disk (7), a second connecting column (18) is connected to the bottom end surface of the second wire guide cylinder (14), the second connecting column (18) is connected to the wire guide seat (1 2), and a second reset elastic member (19) is connected to the wire guide seat (12), the bottom end of the second connecting column (18) is inserted into the wire winding disk (7), and when the wire winding is accelerated by the wire winding disk (7), the electromagnetic inner ring (151) and the electromagnetic outer ring (152) are triggered to be energized, and at the same time the rotating plate (15) starts to rotate, and the bottom end of the second connecting column (18) is adsorbed by the electromagnetic outer ring (152), driving the second wire guide cylinder (14) to move horizontally close to the wire winding disk (7), and at the same time The heating wire (300) begins to be densely wound until the dense winding is completed, the electromagnetic outer ring (152) rotates and moves away from the second connecting column (18), and at the same time the electromagnetic inner ring (151) rotates to the position of the first connecting column (16), and drives the wire guide seat (12) to move laterally close to the wire winding disk (7). As the electromagnetic inner ring (151) rotates and moves away from the first connecting column (16), the electromagnetic inner ring (151) and the electromagnetic outer ring (152) are powered off, and the rotating plate (15) rotates and resets.

9. A production line of an electric heating cable with internal nodes according to claim 8, characterized in that: One side of the rotating plate (15) is connected to a driving gear (20), and an outer gear ring is provided at the outer ring of the rotating plate (15), and is meshed and connected with the driving gear (20) via the outer gear ring.

10. A production line of an electric heating cable with internal nodes according to claim 5, characterized in that: It also includes a laser wire stripper for alternately cutting out both sides of the inner composite layer.

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