An oil-resistant wire harness and its high-precision synchronous parallel wire stranding equipment

Abstract

The present invention discloses an oil-resistant wire harness and its high-precision synchronous parallel wire stranding equipment, which includes multiple wire cores, as well as an armored layer, an aluminum foil layer, and an outer sheath sleeved outside the wire cores. The multiple wire cores are in a stranded form and extend along the length direction. An inner protection layer is provided between the wire cores and the armored layer; the inner protection layer includes a filling and covering layer and a shielding and covering layer. The filling and covering layer includes multiple layers of spirally wound first tapes, and the inner layer of the first tapes is looser than the outer layer. The shielding and covering layer includes a spirally wound second tape, and the second tape presses and covers the outermost first tape; under the extrusion of multiple layers of tapes, the gaps at the stranding of the wire cores are effectively filled by the folds and bends of different degrees; the inner and outer filling layers form shields of different levels, further improving the oil resistance effect of the wire cores; the stranded wire cores can be shaped after entering the shaping cylinder; through winding filling and wrapping, the high-efficiency oil-resistant filling layer can be coated and filled while the wires are stranded and twisted.

Description

Technical Field

[0001] The present invention belongs to the technical field of wire harness processing, and particularly relates to an oil-resistant wire harness and a high-precision synchronous parallel wire stranding device therefor. Background Art

[0002] With the continuous development of electronic technology, wire harnesses have been increasingly widely used. Generally, they include conductors, insulating materials, and sheaths. Among them, the conductors inside the wire harness generally include multiple wire cores in a stranded form.

[0003] It is crucial for the wire harness to have oil-resistant performance to ensure stability and durability. For example, it plays an important role in the electrical system of vehicles to ensure stable and reliable operation in complex usage environments.

[0004] The wire harness mainly provides oil resistance through an outer sheath with oil-resistant properties. Considering the wide application and large demand of wire harnesses, for the sake of improving efficiency, generally only simple processing can be carried out. Most of them have no fillers inside. After the outer skin of the wire harness is damaged, the inside is also easily penetrated. Even for wire harnesses with fillers inside, the fillers inside are difficult to achieve the oil-resistant effect. At the same time, when the wire cores are stranded, there is a lack of high-precision shaping, and the wire harness is prone to loosening and irregularity, affecting the later coating. Moreover, it is impossible to fill the high-efficiency oil-resistant filling layer while carrying out parallel wire stranding. Summary of the Invention

[0005] The present invention provides an oil-resistant wire harness and a high-precision synchronous parallel wire stranding device therefor. Under the layer-by-layer extrusion of multiple layers of tapes, the gaps at the stranding of the wire cores are effectively filled by the folds and bends of different degrees. The inner and outer filling layers form different levels of shielding to further improve the oil-resistant effect of the wire cores. After the stranded wire cores enter the shaping cylinder, shaping can be carried out. Through winding filling and wrapping, it is possible to carry out the coating filling of the high-efficiency oil-resistant filling layer while carrying out parallel wire stranding, so as to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: An oil-resistant wire harness includes multiple wire cores, as well as an armored layer, an aluminum foil layer, and an outer sheath sleeved outside the wire cores. The multiple wire cores are in a stranded form and extend along the length direction. An inner protection layer is provided between the wire cores and the armored layer. The inner protection layer includes a filling coating layer and a shielding coating layer. The filling coating layer includes multiple layers of spirally wound first tapes. The inner layer of the first tapes is looser than the outer layer. The shielding coating layer includes a spirally wound second tape, and the second tape tightly compresses and wraps the outermost first tape.

[0007] Preferably, the outer sheath is made of nitrile rubber.

[0008] Preferably, the pressing lines of adjacent layers of the first tapes do not coincide.

[0009] Preferably, the first winding tape and the second winding tape are both elastic buffer oil-resistant tapes.

[0010] A high-precision synchronous parallel wire stranding device for an oil-resistant wire harness according to any one of the above, comprising a base, on which a wire paying-off mechanism, a wire stranding mechanism, a shaping mechanism, a filling and covering mechanism, a covering mechanism and a wire taking-up mechanism are successively installed;

[0011] The wire paying-off mechanism includes a vertical first support plate, on which a horizontally placed support shaft is rotatably installed through a bearing, the support shaft is driven by a first driving mechanism, a wire dividing plate is fixed at one end of the support shaft, the wire dividing plate is equally divided with a plurality of wire grooves, and a wire paying-off frame corresponding to the wire grooves is arranged on the support shaft;

[0012] The wire stranding mechanism includes a second support plate, on which a wire stranding cylinder is arranged, and a through hole corresponding to the second support plate is arranged;

[0013] The shaping mechanism is installed on the second support plate and is located on the other side of the wire stranding cylinder, and includes a fixed seat, on which a shaping cylinder is installed through a bearing, and the inner wall of the shaping cylinder is a stranded groove adapted to the shape of the wire core of the wire harness;

[0014] The filling and covering mechanism is provided with multiple groups, including a third support plate, on which a wire passing cylinder is fixed, a wire passing disc is fixed at the end of the wire passing cylinder, a tape placing mechanism and an elastic pressing tape mechanism are installed on the wire passing disc, the wire passing cylinder is installed on the third support plate through a bearing, and a second driving mechanism capable of driving the wire passing disc and the wire passing cylinder to rotate is installed on the third support plate;

[0015] The covering mechanism has the same structure as the filling and covering mechanism and is located between the last filling and covering mechanism and the wire taking-up mechanism, and the wire taking-up mechanism includes a wire taking-up roller and a drive for driving it to rotate.

[0016] Preferably, the first driving mechanism includes a first motor fixed on the first support plate, a driven gear is installed on the support shaft after passing through the first support plate, and a driving gear meshing with the driven gear is fixed on the output shaft of the first motor.

[0017] Preferably, the second driving mechanism includes teeth located outside the wire passing disc, a second motor is fixed on the third support plate, and a gear meshing with the teeth is fixed on the output shaft of the second motor.

[0018] Preferably, the wire stranding cylinder and the fixed seat are both detachable on the second support plate.

[0019] Preferably, the tape placing mechanism includes a placing rod and a fixing screw.

[0020] Preferably, the elastic pressing belt mechanism includes a guide rail and a sliding seat mounted on the guide rail. A pressing belt wheel is rotatably mounted on the sliding seat. A baffle is mounted at the rear of the guide rail. A guide rod penetrates through the baffle. A compression spring is mounted on the guide rod, and a stop head is provided at the end.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. Under the extrusion of multiple layers of adhesive tapes, the gaps at the stranding of the wire cores are effectively filled by the folds and bends of different degrees.

[0023] 2. There are multiple inner and outer filling layers. The inner layer is loose to provide a certain elastic buffer, so that the wire harness still has a certain flexibility. The outer layer tensions and binds the wire cores to prevent them from loosening.

[0024] 3. The inner and outer filling layers with different degrees of relaxation form different levels of shielding. When there is permeating oil inside, the oil is also easy to flow in the channels between the layers and is not easy to enter the space of the innermost layer, further improving the oil resistance effect of the wire cores.

[0025] 4. After the stranded wire cores enter the shaping cylinder, the stranding grooves will shape the irregular wire cores with slight deformation.

[0026] 5. Through winding filling and wrapping, it is possible to achieve the coiling of wires and the high-efficiency coating and filling of the oil-resistant filling layer at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic cross-sectional structure diagram of the wire harness of the present invention;

[0028] Figure 2 It is a schematic diagram of the first winding belt pressing of the inner and outer layers of the present invention;

[0029] Figure 3 It is a schematic structure diagram of the wire coiling device of the present invention;

[0030] Figure 4 It is a schematic structure diagram of the wire dividing board and the wire groove of the present invention;

[0031] Figure 5 It is a schematic cross-sectional structure diagram of the wire coiling mechanism and the shaping mechanism of the present invention;

[0032] Figure 6 It is a schematic structure diagram of the shaping cylinder and the stranding grooves of the present invention;

[0033] Figure 7 It is a schematic cross-sectional structure diagram of the coating mechanism of the present invention;

[0034] Figure 8 It is a schematic partial side view structure diagram of the coating mechanism of the present invention;

[0035] Figure 9Schematic diagram of the sliding seat, pinch roller and guide rod of the present invention.

[0036] In the figure: 1, wire core; 2, armor layer; 3, aluminum foil layer; 4, outer sheath; 5, inner sheath; 6, first winding tape; 7, second winding tape; 8, crimping wire; 9, base; 10, first support plate; 11, support shaft; 12, wire dividing plate; 13, wire groove; 14, wire pay-off stand; 15, second support plate; 16, stranding barrel; 17, through hole; 18, fixed seat; 19, shaping cylinder; 20, stranding groove; 21, third support plate; 22, wire passing cylinder; 23, wire passing disc; 24, tape placing mechanism; 25, elastic pinch mechanism; 26, take-up roller; 27, first motor; 28, driven gear; 29, driving gear; 30, gear teeth; 31, second motor; 32, gear; 33, placing rod; 34, fixing screw; 35, guide rail; 36, sliding seat; 37, pinch roller; 38, baffle; 39, guide rod; 40, extrusion spring; 41, stop head. Specific embodiments

[0037] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figure 1, the present invention provides an oil-resistant wire harness, which includes a plurality of wire cores 1, and an armor layer 2, an aluminum foil layer 3, and an outer sheath 4 sleeved outside the wire cores 1. The plurality of wire cores 1 are twisted and extend along the length direction. The twisting of the wire cores can increase the flexibility of the wire harness, making it easier to bend and adapt to various wiring situations. An inner sheath 5 is provided between the wire core 1 and the armor layer 2; the inner sheath 5 includes a filling and covering layer and a shielding and covering layer. The inner sheath 5 provides filling and shielding functions for the wire core 1. The filling and covering layer includes multiple layers of helically wound first tapes 6. The inner layer of the first tape 6 is relatively loose compared to the outer layer. When covering, the loose inner layer of the first tape 6 will be wound and squeezed by the outer layer of the first tape 6. Under the squeezing of the relatively more tensioned outer layer, the loose inner layer will fold and bend inward and enter the gaps where the wire cores 1 are twisted; the shielding and covering layer includes a helically wound second tape 7. The second tape 7 presses and covers the outermost first tape 6. The second tape 7 can squeeze the multiple layers of the first tape 6 layer by layer. The different degrees of folding and bending of the multiple layers of the first tape 6 effectively fill the gaps where the wire cores 1 are twisted; multiple layers of inner and outer filling layers, the inner layer is loose to provide a certain elastic buffer, so that the wire harness still has a certain softness, and the outer layer tightens and binds the wire cores to prevent them from loosening; and the inner and outer filling layers with different degrees of looseness, while tightly covering the wire core 1, also form different levels of shielding. When there is permeating oil inside, the oil is also easy to flow in the channels between the layers and is not easy to enter the space of the innermost layer, further improving the oil resistance effect of the wire core.

[0039] As Figure 1 shown, the outer sheath 4 is made of nitrile rubber; in this embodiment, nitrile rubber has excellent oil resistance and insulation protection performance, which is beneficial to the stability and durability of the wire harness.

[0040] As Figure 2 shown, the crimping lines 8 of the adjacent layers of the first tapes 6 do not coincide; in this embodiment, thus the crimping lines 8 of the inner and outer layers are staggered, and the oil infiltrating into the interior is not easy to directly enter each layer of the first tapes 6 from the crimping lines 8.

[0041] As Figure 1 shown, the first tape 6 and the second tape 7 are both elastic buffer oil-resistant tapes; in this embodiment, the elastic buffer oil-resistant tapes are beneficial for filling when covering the wire core 1. Preferably, fiberglass cloth tapes are used, so that the wire core 1 has a certain elastic buffer effect when bending, does not interfere with the softness of the wire harness, and the tapes have oil resistance performance, forming multiple layers of oil-resistant protection.

[0042] Please refer to Figures 3 - 7 , the present invention provides a high-precision synchronous parallel wire twisting device for any one of the above-mentioned oil-resistant wire harnesses, which includes a base 9. An unwinding mechanism, a wire twisting mechanism, a shaping mechanism, a filling and covering mechanism, a covering mechanism, and a winding mechanism are sequentially installed on the base 9;

[0043] The wire pay-off mechanism includes a vertical first support plate 10. A horizontally placed support shaft 11 is rotatably installed on the first support plate 10 through bearings. The support shaft 11 is driven by a first driving mechanism. One end of the support shaft 11 is fixed with a wire dividing plate 12. The wire dividing plate 12 is equally divided into a plurality of wire grooves 13. A wire pay-off frame 14 corresponding to the wire grooves 13 is arranged on the support shaft 11. Wire cores are paid off through a plurality of wire pay-off frames 14, and the wire cores are merged and synchronously enter the stranding mechanism through the corresponding wire grooves 13 of the wire dividing plate 12;

[0044] The stranding mechanism includes a second support plate 15. A stranding cylinder 16 is arranged on the second support plate 15. The second support plate 15 is provided with a through hole 17 corresponding thereto. A plurality of wire cores are merged and synchronously enter the stranding cylinder 16. When the wire pay-off mechanism drives and drives the rotation through the first driving mechanism, the plurality of wire cores will be stranded at the stranding cylinder 16, and the stranded wire cores enter the shaping mechanism through the through hole 17;

[0045] The shaping mechanism is installed on the second support plate 15 and is located on the other side of the stranding cylinder 16. It includes a fixed seat 18. A shaping cylinder 19 is installed on the fixed seat 18 through bearings. The inner wall of the shaping cylinder 19 is a stranded groove 20 adapted to the shape of the wire cores of the wire harness. After the stranded wire cores enter the shaping cylinder 19, their outer walls will enter the stranded groove 20 adapted thereto. The stranded groove 20 will shape the irregular wire cores with slight deformation, and then enter the filling and covering mechanism;

[0046] A plurality of groups of filling and covering mechanisms are provided. The number of filling and covering mechanisms is correspondingly set according to the number of layers of the first wrapping tape 6. It includes a third support plate 21. A wire passing cylinder 22 is fixed on the third support plate 21. A wire passing disc 23 is fixed at the end of the wire passing cylinder 22. A tape placing mechanism 24 and an elastic tape pressing mechanism 25 are installed on the wire passing disc 23. The wire passing cylinder 22 is installed on the third support plate 21 through bearings. A second driving mechanism capable of driving the wire passing disc 23 and the wire passing cylinder 22 to rotate is installed on the third support plate 21. By installing the tape on the tape placing mechanism 24, the end of the tape is adhered to the outer wall of the stranded wire core. When the stranded wire core is conveyed backward following the traction mechanism, the second driving mechanism drives the wire passing disc 23 to rotate. Furthermore, the tape will continuously wind and cover the stranded wire core. Different elastic tape pressing mechanisms 25 of different filling and covering mechanisms can select different elastic pressing forces, and the elastic pressing forces gradually increase. Furthermore, the previously wrapped tape will be more relaxed. Furthermore, when the subsequent tape is wrapped for winding, the loose inner layer will be wrinkled and bent inward into the gaps of the wire core stranding under the tight extrusion of the relatively tighter outer layer;

[0047] The covering mechanism has the same structure as the filling and covering mechanism and is located between the filling and covering mechanism at the rearmost side and the wire take-up mechanism. Thus, the tape on the covering mechanism can extrude the previously covered tapes layer by layer, and the wrinkles and bends of the multi-layer tapes to different degrees can effectively fill the gaps in the stranding of the wire core. The wire take-up mechanism includes a wire take-up roller 26 and a drive for driving its rotation. After the fully covered wire harness is taken up by the wire take-up roller 26, the next processes such as the armor layer, aluminum foil layer, and outer sheath can be sleeved.

[0048] As Figure 3 shown, the first drive mechanism includes a first motor 27 fixed on the first support plate 10. The support shaft 11 passes through the first support plate 10 and is equipped with a driven gear 28. The output shaft of the first motor 27 is fixed with a driving gear 29 that meshes with the driven gear 28. In this embodiment, the driving gear 29 is driven to rotate by the first motor 27, and then the driven gear 28 can be driven to rotate, and further the support shaft 11 can be driven to rotate, thereby completing the stranding process of the wire core.

[0049] As Figure 7 shown, the second drive mechanism includes a gear tooth 30 located outside the wire passing disc 23. A second motor 31 is fixed on the third support plate 21. The output shaft of the second motor 31 is fixed with a gear 32 that meshes with the gear tooth 30. In this embodiment, the gear 32 is driven to rotate by the second motor 31, and then the gear tooth 30 and the wire passing disc 23 are driven to rotate, further completing the winding and wrapping of the tape.

[0050] As Figure 5 shown, the stranding cylinder 16 and the fixing seat 18 are both detachable on the second support plate 15. In this embodiment, the stranding cylinder 16 and the fixing seat 18 can be conveniently installed and disassembled on the second support plate 15 by screws, which is beneficial for replacement.

[0051] As Figure 7 shown, the tape placing mechanism 24 includes a placing rod 33 and fixing screws 34. In this embodiment, the placing rod 33 facilitates the placement of the tape, and the fixing screws 34 prevent the tape from rotating on the placing rod 33, which is beneficial for winding and wrapping the wire core.

[0052] As Figures 8 - 9As shown, the elastic pressing belt mechanism 25 includes a guide rail 35 and a sliding seat 36 mounted on the guide rail 35. A pressing belt wheel 37 is rotatably mounted on the sliding seat 36. A baffle 38 is mounted at the rear of the guide rail 35. A guide rod 39 penetrates through the baffle 38. A compression spring 40 is mounted on the guide rod 39, and a stop head 41 is provided at the end. In this embodiment, the compression spring 40 will press the sliding seat 36, causing it to slide along the guide rail 35 towards the other end. Thus, the pressing belt wheel 37 on the sliding seat 36 will elastically press on the adhesive tape to provide continuous elastic pressing, and the stop head 41 prevents the sliding seat 36 from detaching from the guide rail 35 under the action of the compression spring 40.

[0053] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-resistant wire harness, comprising a plurality of wire cores (1), and an armor layer (2), an aluminum foil layer (3), and an outer sheath (4) sleeved outside the wire cores (1), characterized in that: The plurality of wire cores (1) are twisted and extend in a length direction, and an inner sheath (5) is provided between the wire core (1) and the armor layer (2); the inner sheath (5) comprises a filling coating layer and a shielding coating layer, the filling coating layer comprises a plurality of spirally wound first tapes (6), the inner layer of the first tape (6) being loose relative to the outer layer, and the shielding coating layer comprises a spirally wound second tape (7), the second tape (7) compressing and covering the outermost layer of the first tape (6).

2. The oil-resistant wiring harness according to claim 1, characterized in that: The outer sheath (4) is made of nitrile rubber.

3. The oil-resistant wiring harness according to claim 1, characterized in that: The pressing lines (8) of the first winding tapes (6) of adjacent layers do not overlap.

4. The oil-resistant wiring harness according to claim 1, characterized in that: The first winding tape (6) and the second winding tape (7) are both elastic buffer oil-resistant tapes.

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