Automatic manufacturing device for network cable crystal head
Through the automated network cable crystal head production device, the problem of traditional manual production efficiency is solved, efficient and low-cost automatic production of crystal heads is achieved, the risk of wire core damage and wrong sorting is reduced, and the production quality is improved.
Patent Information
- Application Number
- CN202421969360.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-14
AI Technical Summary
In the traditional crystal head production method, manual peeling and straightening network cables are inefficient and have poor results, resulting in low construction efficiency and potential damage to the wire core.
Automatic production device of the network cable crystal head is adopted, including a peeling device, an automatic wire rub device, an automatic cutting device, a line sequence distribution device and an automatic crimping device. The automatic processing of the network cable is achieved through motor drive and magnetic clamping components to ensure that the wire core is inserted into the crystal head in chromatographic order.
It improves the efficiency of crystal head production, saves time and labor costs, reduces the risk of wire core damage, reduces the order errors and end face production failure rate, and improves the production quality.
Smart Images
Figure CN223167838U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of railway construction, and particularly relates to an automatic device for manufacturing network cable crystal heads. Background Art
[0002] With the acceleration of the construction pace of the railway industry and the compression of the construction time, the construction period of each specialty has been shortened. Especially for the four-electrical specialties of the post-station units, the construction period is often compressed to zero. Moreover, with the popularization of railway informatization, network cables are used more frequently and in large quantities.
[0003] The traditional method for manufacturing crystal heads is as follows: First, peel off the sheath of the network cable, then separate the wire cores by hand, arrange them in the chromatographic order, twist the wire cores up, down, left, and right to straighten them, then compare the length of the straightened wire cores with that of the crystal head, and manually cut each wire core one by one to make its length match that of the crystal head. Finally, insert the wire cores into the crystal head in the chromatographic order and crimp them with a network cable pliers. However, there are problems such as low efficiency and poor effect in manual processes such as peeling the network cable and straightening the network cable. Content of the Utility Model
[0004] In order to overcome the above deficiencies of the prior art, the utility model provides an automatic device for manufacturing network cable crystal heads, which solves the problems of low efficiency and poor effect in manual processes such as peeling the network cable and straightening the network cable.
[0005] In order to achieve the above object, the utility model adopts the following technical scheme:
[0006] An automatic device for manufacturing network cable crystal heads includes a network cable with a first end; a stripping device including a fixed component, a spring stripping knife, a magnetic clamping component, and a driving motor arranged in sequence. The first end of the network cable passes through the fixed component and abuts against the magnetic clamping component. The bottom of the network cable is closely attached to the blade of the spring stripping knife. The driving motor clamps the network cable through the magnetic clamping component, and drives the network cable to rotate through the magnetic clamping component. The spring stripping knife strips the insulating layer of the network cable; an automatic wire twisting device including a rotating motor, a gear, a connecting arm, a guide rail, a slider, a first electric cylinder, a first wire twisting plate, and a second wire twisting plate. The rotating motor drives the gear to rotate. The two ends of the connecting arm are respectively rotatably connected to the gear and the slider. The first wire twisting plate is arranged on the upper surface of the slider. The second wire twisting plate is arranged above the first wire twisting plate. The first end of the network cable is placed between the first wire twisting plate and the second wire twisting plate. The first wire twisting plate reciprocates along the direction of the guide rail. The first electric cylinder drives the second wire twisting plate to reciprocate vertically, approaching or separating from the first wire twisting plate to twist open the first end of the network cable; an automatic cutting device including a second electric cylinder, a cutting blade, and a cutting base. The cutting base forms a cutting groove for placing the first end of the network cable after being twisted open. The cutting blade is placed above the cutting groove. The second electric cylinder drives the cutting blade to move vertically to cut the first end of the network cable in sequence; a wire sequence distribution device including a crystal head, a chromatographic guide sheet, and a card slot. The chromatographic guide sheet is arranged opposite to the card slot. The crystal head is placed in the card slot. The wire cores of the first end of the network cable after cutting are inserted into the crystal head in sequence according to the order of the chromatographic guide sheet; and an automatic crimping device including a third electric cylinder, a crimping head, a limiter, and a crimping base. The crimping base forms a crimping groove for placing the crystal head. The limiter is placed in the crimping groove. The limiter is electrically connected to the third electric cylinder. When the crystal head touches the limiter, the third electric cylinder drives the crimping head to crimp the crystal head and the network cable downward.
[0007] Preferably, the fixed component includes a fixed bracket and a fixed ring placed on the fixed bracket. A spiral hole is opened at the top of the fixed ring, and a screw is arranged in the spiral hole. The first end of the network cable penetrates into the fixed ring, and the screw abuts against the network cable.
[0008] Preferably, the height of the blade of the spring stripping knife is h, the highest height of the inner ring surface of the fixed ring is H1, and the lowest height is H2. h, H1, and H2 satisfy: H2 < h < H1.
[0009] Preferably, the magnetic attraction clamping assembly includes a roller, a frame, a first magnetic sheet and a second magnetic sheet. The frame is fixedly connected to the roller. A guide rod is arranged on the frame. The first magnetic sheet is fixedly connected to the guide rod. The second magnetic sheet is slidably connected to the guide rod. The first magnetic sheet and the second magnetic sheet generate magnetic force when energized. The second magnetic sheet slides to be attracted to the first magnetic sheet to clamp the first end of the network cable. The driving motor drives the roller to drive the network cable to rotate.
[0010] Preferably, the first magnetic sheet and the second magnetic sheet have arc-shaped surfaces that fit the outer contour of the first end of the network cable.
[0011] Preferably, the first magnetic sheet and the second magnetic sheet are provided with limiting protrusions for fixing the first end of the network cable.
[0012] Preferably, buffer rubber rings are provided on the surfaces of both of the arc-shaped surfaces.
[0013] Preferably, the axial length of the insulation layer of the stripped network cable is 20 mm.
[0014] Preferably, the cutting base is provided with a cutting inlet communicating with the cutting groove. The aperture of the cutting inlet is d. The outer diameter of the network cable with the insulation layer stripped is D1, and the outer diameter of the network cable with the insulation layer is D2, where D1 < d < D2.
[0015] The beneficial effects of the present invention are as follows: the present invention provides a stripping device, the first end of the mesh cable passes through the fixing assembly and abuts the magnetic clamping assembly, at this time the bottom of the mesh cable is close to the blade of the spring skin-breaking knife, the driving motor drives the magnetic clamping assembly to clamp the mesh cable and drives the magnetic clamping assembly to drive the mesh cable to rotate, so that the spring skin-breaking knife strips the insulation layer of the mesh cable, completing the mesh cable stripping process, and placing the stripped first end of the mesh cable between the first wire-rubbing plate and the second wire-rubbing plate, rotating the motor to drive the gear to rotate, and the gear drives the first wire-rubbing plate on the slider to move relative to the guide rail through the connecting arm, and at the same time the first motor drives the first wire-rubbing plate on the slider to move relative to the guide rail. The cylinder drives the second wire-rubbing plate to continuously move in the direction toward the first wire-rubbing plate, thereby rubbing the first end of the network cable apart, and placing the rubbed first end of the network cable into the cutting slot. The second electric cylinder drives the cutting blade to move downward in the vertical direction, cuts off part of the wire core, places the crystal head into the card slot, places the chromatogram guide piece relative to the card slot, and inserts the cut wire core into the crystal head in sequence according to the chromatogram sequence of the pre-prepared chromatogram guide piece. The crystal head is placed in the crimping slot until it contacts the limiter. At this time, the third electric cylinder above the crimping base begins to move downward, driving the crimping head to press down, and the crimping work of the crystal head can be completed. The utility model improves the production efficiency of crystal heads at the construction site, saves a lot of time, reduces labor costs, solves the hidden dangers of wire core damage during the production process of the crystal head, and solves the problem of pain caused by manual straightening for a long time. The chromatogram guide card reduces the hidden dangers of incorrect chromatogram sorting of the wire core. The automatic cutting device and the automatic crimping device reduce the failure rate of the crystal head end face production, and improves the production quality of the crystal head. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of a stripping device according to the present invention;
[0017] Figure 2 is a schematic diagram of the fixing assembly of the present invention;
[0018] Figure 3 Schematic diagram of the automatic thread twisting device of the present invention;
[0019] Figure 4 is a schematic diagram of the automatic cutting device of the present invention;
[0020] Figure 5 A schematic diagram of a line sequence distribution device of the present invention;
[0021] Figure 6 This is a schematic diagram of the automatic crimping device of the present invention.
[0022] In the figure:
[0023] 10. Network cable;
[0024] 20. Stripping device; 21. Fixing component; 211. Fixing bracket; 212. Fixing ring; 2121. Spiral hole; 213. Screw; 22. Spring wire stripping knife; 23. Magnetic clamping component; 231. Roller; 232. First magnetic sheet; 233. Second magnetic sheet; 234. Arc surface; 235. Limit projection; 236. Guide rod; 24. Driving motor; 25. Frame
[0025] 30. Automatic wire twisting device; 31. Rotating motor; 32. Gear; 33. Connecting arm; 34. Guide rail; 35. Slide block; 36. First electric cylinder; 37. First wire twisting plate; 38. Second wire twisting plate
[0026] 40. Automatic cutting device; 41. Second electric cylinder; 42. Cutting blade; 43. Cutting base; 431. Cutting groove; 432. Cutting entrance
[0027] 50. Wire sequence distribution device; 51. Crystal head; 52. Chromatogram guiding sheet; 53. Card slot
[0028] 60. Automatic crimping device; 61. Third electric cylinder; 62. Crimping head; 63. Limiter; 64. Crimping base; 641. Crimping groove Detailed implementation manners
[0029] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations
[0030] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model
[0031] The present utility model will be further described below with reference to the accompanying drawings and embodiments
[0032] Such as Figures 1-6As shown in the figure, this embodiment provides an automatic device for manufacturing network cable connectors, including a network cable 10 with a first end; a stripping device 20, including a fixed component 21, a spring wire stripping knife 22, a magnetic clamping component 23, and a driving motor 24 arranged in sequence. The first end of the network cable 10 passes through the fixed component 21 and abuts against the magnetic clamping component 23. The bottom of the network cable 10 is closely attached to the blade of the spring wire stripping knife 22. The driving motor 24 drives the magnetic clamping component 23 to clamp the network cable 10, and the driving motor 24 drives the network cable 10 to rotate through the magnetic clamping component 23, and the spring wire stripping knife 22 strips the insulating layer of the network cable 10; an automatic wire twisting device 30, including a rotating motor 31, a gear 32, a connecting arm 33, a guide rail 34, a slider 35, a first electric cylinder 36, a first wire twisting plate 37, and a second wire twisting plate 38. The rotating motor 31 drives the gear 32 to rotate. Both ends of the connecting arm 33 are rotatably connected to the gear 32 and the slider 35 respectively. The first wire twisting plate 37 is arranged on the upper surface of the slider 35, and the second wire twisting plate 38 is arranged above the first wire twisting plate 37. The first end of the network cable 10 is placed between the first wire twisting plate 37 and the second wire twisting plate 38. The first wire twisting plate 37 reciprocates along the direction of the guide rail 34, and the first electric cylinder 36 drives the second wire twisting plate 38 to reciprocate vertically, approaching or moving away from the first wire twisting plate 37, thereby twisting open the first end of the network cable 10; an automatic cutting device 40, including a second electric cylinder 41, a cutting blade 42, and a cutting base 43. The cutting base 43 forms a cutting groove for placing the first end of the network cable 10 after being twisted open. The cutting blade 42 is placed above the cutting groove, and the second electric cylinder 41 drives the cutting blade 42 to move vertically to sequentially cut the first end of the network cable 10; a wire sequence distribution device 50, including a connector 51, a color spectrum guiding piece 52, and a card slot 53. The color spectrum guiding piece 52 is arranged opposite to the card slot 53. The connector 51 is placed in the card slot 53. The wire cores of the first end of the network cable 10 after cutting are sequentially inserted into the connector 51 according to the sequence of the color spectrum guiding piece 52; and an automatic crimping device 60, including a third electric cylinder 61, a crimping head 62, a limiter 63, and a crimping base 64. The crimping base 64 forms a crimping groove for placing the connector 51. The limiter 63 is placed in the crimping groove, and the limiter 63 is electrically connected to the third electric cylinder 61. When the connector 51 touches the limiter 63, the third electric cylinder 61 drives the crimping head 62 to press down the connector 51 and the network cable 10.
[0033] The utility model completes the stripping process of the network cable 10 by setting a stripping device 20. The first end of the network cable 10 passes through a fixing assembly 21 and abuts against a magnetic clamping assembly 23. At this time, the bottom of the network cable 10 is closely attached to the blade of a spring stripping knife 22. A driving motor 24 drives the magnetic clamping assembly 23 to clamp the network cable 10 and drives the magnetic clamping assembly 23 to drive the network cable 10 to rotate, so that the spring stripping knife 22 strips the insulating layer of the network cable 10. The first end of the stripped network cable 10 is placed between a first wire twisting plate 37 and a second wire twisting plate 38. A rotating motor 31 drives the gear 32 to rotate. The gear 32 drives the first wire twisting plate 37 on a slider 35 to move relative to a guide rail 34 through a connecting arm 33. At the same time, a first electric cylinder 36 drives the second wire twisting plate 38 to continuously move in the direction towards the first wire twisting plate 37, so as to twist open the first end of the network cable 10. The first end of the twisted network cable 10 is placed into a cutting slot. A second electric cylinder 41 drives a cutting blade 42 to move downward in the vertical direction to cut off part of the wire cores. The cut wire cores fall into a small drawer behind a cutting base 43 and are manually cleaned after a certain amount is collected. A crystal head 51 is placed into a card slot 53. A chromatogram guiding sheet 52 is placed opposite to the card slot 53. The cut wire cores are inserted into the crystal head 51 in sequence according to the chromatogram order of the pre-prepared chromatogram guiding sheet 52. The crystal head 51 is placed into a crimping slot until it contacts a stopper 63. At this time, a third electric cylinder 61 above a crimping base 64 starts to move downward to drive a crimping head 62 to press down, and thus the crimping work of the crystal head 51 can be completed. The utility model improves the production efficiency of the crystal head 51 at the construction site, saves a large amount of time, reduces the labor cost, solves the hidden danger of wire core damage during the production process of the crystal head 51 and the problem of soreness caused by manual long-time straightening, the chromatogram guiding card reduces the hidden danger of incorrect chromatogram sorting of the wire cores, and the automatic cutting device and the automatic crimping device 60 reduce the failure rate of the end face production of the crystal head 51 and improve the production quality of the crystal head 51.
[0034] Please continue to refer to Figure 2 As shown, the fixing assembly 21 includes a fixing bracket 211 and a fixing ring 212 placed on the fixing bracket 211. A spiral hole 2121 is opened at the top of the fixing ring 212. A screw 213 is arranged in the spiral hole 2121. The first end of the network cable 10 penetrates into the fixing ring 212, and the screw 213 abuts against the network cable 10. Since the outer diameter of the network cable 10 is smaller than the outer diameter of the fixing ring 212, the network cable 10 can smoothly pass through the fixing ring 212. However, since the network cable 10 needs to rotate with the magnetic clamping assembly 23, it cannot be fixed too tightly. That is, the network cable 10 is pressed by the screw 213 so that the network cable 10 can rotate freely and does not fall off from the fixing ring 212.
[0035] Furthermore, the blade height of the spring-loaded knife 22 is h, the highest height of the inner surface of the retaining ring 212 is H1, and the lowest height is H2. h, H1, and H2 satisfy the following relationship: H2 < h < H1. To ensure that the blade of the spring-loaded knife 22 can peel off the insulation layer of the network cable 10 during rotation, the blade of the spring-loaded knife 22 must be higher than the bottommost surface of the inner surface of the retaining ring 212, thereby smoothly peeling off the insulation layer.
[0036] Also, please continue to refer to Figure 1 As shown, the magnetic clamping assembly 23 includes a roller 231, a frame 25, a first magnetic sheet 232 and a second magnetic sheet 233. The frame 25 is fixedly connected to the roller 231. A guide rod 236 is provided on the frame 25. The first magnetic sheet 232 is fixedly connected to the guide rod 236. The second magnetic sheet 233 is slidably connected to the guide rod 236. The first magnetic sheet 232 and the second magnetic sheet 233 are energized to generate magnetic force. The second magnetic sheet 233 slides to engage with the first magnetic sheet 232 to clamp the first end of the network cable. The drive motor 24 drives the roller 231 to drive the network cable to rotate. Insert the network cable 10 between the first magnetic sheet 232 and the second magnetic sheet 233 through the fixing component 21, turn on the first-level switch of the dual power supply, energize the first magnetic sheet 232 and the second magnetic sheet 233 to generate magnetic force, and move the second magnetic sheet 233 toward the first magnetic sheet 232 until the two clamp the network cable 10. Then turn on the second-level switch of the dual power supply, ensure that the first magnetic sheet 232 and the second magnetic sheet 233 are energized, and rotate the electric motor of the drive motor 24 to drive the network cable 10 to rotate, and use the spring skin knife 22 to break the insulation layer of the network cable 10.
[0037] Furthermore, in order to accurately control the cutting length of the insulation layer at the first end of the network cable 10, a limiting protrusion 235 is set on the side of the first magnetic plate 232 and the second magnetic plate 233 facing the drive motor 24. When the first end of the network cable 10 extends between the first magnetic plate 232 and the second magnetic plate 233, the limiting protrusion 235 can prevent the first end of the network cable 10 from excessively extending, thereby accurately controlling its cutting length.
[0038] In some embodiments, the first magnetic sheet 232 and the second magnetic sheet 233 are both provided with an arcuate surface 234 that fits the outer contour of the first end of the network cable 10 , and are used to adapt to the outer contour of the first end of the network cable 10 , and the limiting protrusion 235 protrudes from the arcuate surface 235 .
[0039] In other embodiments, both of the arc-shaped surfaces 234 are provided with buffer rubber rings. Buffer rubber rings are provided on the arc-shaped surfaces 234 of the first magnetic sheet 232 and the second magnetic sheet 233 to prevent the inner core of the network cable 10 from being damaged.
[0040] In this embodiment, since the length of the wire core finally entering the RJ45 connector 51 is 15 mm and the wire core will be cut after being peeled, it is necessary to reserve an axial length of 5 mm for cutting. Therefore, the axial length of the insulation layer of the network cable 10 after being peeled is 20 mm.
[0041] Please continue to refer to Figure 4 As shown, the cutting base 43 is provided with a cutting inlet 432 communicating with the cutting groove. The aperture of the cutting inlet 432 is d, the outer diameter of the network cable 10 with the insulation layer peeled off is D1, and the outer diameter of the network cable 10 with the insulation layer is D2, where D1 < d < D2. Setting the aperture of the cutting inlet to be greater than the outer diameter of the wire core and less than the outer diameter of the insulation layer can enable the peeled wire core part to smoothly enter the cutting base 43 and prevent the insulation layer part from entering the cutting base 43, thereby preventing damage to other parts of the network cable 10 during cutting.
[0042] Please continue to refer to Figure 6 As shown, in this embodiment, a color code guide piece 52 can be directly provided on the outer shell of the network cable RJ45 connector automatic manufacturing device, and the card slot 53 is placed corresponding to it. The construction personnel insert the wire cores into the RJ45 connector 51 in sequence according to the color code order on the upper part of the card slot 53.
[0043] The above has described the embodiments of the present invention in detail, but the content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the patent coverage scope of the present invention.
Claims
1. An automatic device for manufacturing network cable crystal heads, characterized in that, Comprising: A network cable, including a first end; A stripping device, including a fixed component, a spring stripping knife, a magnetic clamping component, and a driving motor arranged in sequence. The first end of the network cable passes through the fixed component and abuts against the magnetic clamping component. The bottom of the network cable is closely attached to the blade of the spring stripping knife. The driving motor clamps the network cable through the magnetic clamping component, and the driving motor drives the network cable to rotate through the magnetic clamping component. The spring stripping knife strips the insulating layer of the network cable; An automatic wire twisting device, including a rotating motor, a gear, a connecting arm, a guide rail, a slider, a first electric cylinder, a first wire twisting plate, and a second wire twisting plate. The rotating motor drives the gear to rotate. Both ends of the connecting arm are rotatably connected to the gear and the slider respectively. The first wire twisting plate is arranged on the upper surface of the slider. The second wire twisting plate is arranged above the first wire twisting plate. The first end of the network cable is placed between the first wire twisting plate and the second wire twisting plate. The first wire twisting plate reciprocates along the direction of the guide rail. The first electric cylinder drives the second wire twisting plate to reciprocate vertically, approaching or separating from the first wire twisting plate, thereby twisting open the first end of the network cable; An automatic cutting device, including a second electric cylinder, a cutting blade, and a cutting base. The cutting base forms a cutting groove for placing the first end of the network cable after being twisted open. The cutting blade is placed above the cutting groove. The second electric cylinder drives the cutting blade to move vertically to sequentially cut the first end of the network cable; A wire sequence distribution device, including a crystal head, a chromatographic guide piece, and a card slot. The chromatographic guide piece is arranged opposite to the card slot. The crystal head is placed in the card slot. The wire cores of the first end of the network cable after cutting are sequentially inserted into the crystal head according to the sequence of the chromatographic guide piece; And An automatic crimping device, including a third electric cylinder, a crimping head, a limiter, and a crimping base. The crimping base forms a crimping groove for placing the crystal head. The limiter is placed in the crimping groove. The limiter is electrically connected to the third electric cylinder. When the crystal head touches the limiter, the third electric cylinder drives the crimping head to press down and crimp the crystal head and the network cable.
2. The automatic manufacturing device for network cable crystal heads according to claim 1, characterized in that, The fixed component includes a fixed bracket and a fixed ring placed on the fixed bracket. A spiral hole is opened at the top of the fixed ring, and a screw is arranged in the spiral hole. The first end of the network cable penetrates into the fixed ring, and the screw abuts against the network cable.
3. The automatic network cable crystal head manufacturing device according to claim 2, wherein, The height of the blade of the spring stripping knife is h, the highest height of the inner ring surface of the fixed ring is H1, and the lowest height is H2. h, H1, and H2 satisfy: H2 < h < H1.
4. The automatic network cable RJ45 connector manufacturing device according to claim 1, characterized in that, The magnetic clamping component includes a roller, a frame, a first magnetic sheet, and a second magnetic sheet. The frame is fixedly connected to the roller. A guide rod is arranged on the frame. The first magnetic sheet is fixedly connected to the guide rod. The second magnetic sheet is slidably connected to the guide rod. The first magnetic sheet and the second magnetic sheet generate magnetic force when energized. The second magnetic sheet slides to be attracted to the first magnetic sheet to clamp the first end of the network cable. The driving motor drives the roller to drive the network cable to rotate.
5. The automatic network cable crystal head manufacturing device according to claim 4, characterized in that, The first magnetic sheet and the second magnetic sheet have arc-shaped surfaces that fit the outer contour of the first end of the network cable.
6. The automatic network cable RJ45 connector manufacturing device according to claim 5, characterized in that, The first magnetic sheet and the second magnetic sheet are provided with limit protrusions for fixing the first end of the network cable.
7. The automatic network cable RJ45 connector manufacturing device according to claim 5, characterized in that, Buffer rubber rings are provided on the surfaces of both of the arc-shaped surfaces.
8. The automatic production device for network cable crystal heads according to claim 1, characterized in that, The axial length of the peeled insulating layer of the network cable is 20 mm.
9. The automatic production device for network cable crystal heads according to claim 1, characterized in that, The cutting base is provided with a cutting inlet communicating with the cutting groove, the aperture of the cutting inlet is d, the outer diameter of the network cable with the peeled insulating layer is D1, and the outer diameter of the network cable with the insulating layer is D2, where D1 < d < D2.