Cable sheath inner ring cutting device and sheath inner ring cutting method

Abstract

The invention discloses an inner ring cutting device for a cable sheath, belongs to the technical field of cable detection, solves the problem of poor inner ring cutting quality of the cable sheath in the prior art, and is suitable for cutting a cable with a sheath provided with an armor layer. The cable sheath inner ring cutting device comprises a ring cutting box, a workbench, a core ejecting structure, a power assembly and a ring cutting tool mechanism, the power assembly drives the core ejecting structure to press down filler and a conductor on the inner side of a cable sheath by a set depth relative to the cable sheath, and the workbench is provided with an inner side positioning structure and an outer side positioning structure. The power assembly drives the inner side positioning structure to abut against the inner side face of a cable inner sheath layer and drives the outer side positioning structure to abut against the outer side face of a cable outer sheath layer so as to limit the position of the cable sheath, and the power assembly drives a cutter of the annular cutting tool mechanism to stretch into the inner side of the cable sheath so as to cut the inner sheath layer. The inner ring cutting quality of the cable sheath is mainly improved. The invention further discloses a sheath inner ring cutting method.

Description

Technical Field

[0001] The invention relates to the technical field of cable detection, in particular to a cable sheath inner ring cutting device and a sheath inner ring cutting method. Background Art

[0002] Cables are usually divided into cables with armored sheaths and cables with non-metallic sheaths. Cables with armored sheaths usually include sheaths and fillers and conductors located inside the sheaths. The sheaths include inner sheath layers, armored layers, and outer sheath layers from the inside to the outside. In order to prepare samples of cables, the prior art invention CN117458349A discloses a cable non-metallic sheath ring cutting device and method, which drives the inner top block to fit the inner side of the cable outer sheath through an inner top block driver, and then cooperates with a cutter to cut the non-metallic sheath. For cables with armored sheaths, it is necessary to cut the inner sheath layer, resulting in the cutter and the inner top block being located on the same side when cutting the cables with armored sheaths. The sheath is relatively soft and easily deformed and changes position, which affects the quality of cable ring cutting. Summary of the invention

[0003] The purpose to be achieved by the present invention is to provide a cable sheath inner ring cutting device, which solves the problem of poor cable sheath inner ring cutting quality in the prior art and improves the cable sheath inner ring cutting quality.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a cable sheath inner ring cutting device, suitable for cutting cables with armor layers in sheaths, the cable sheath inner ring cutting device comprises a ring cutting box and a workbench, a top core structure, a power assembly and a ring cutting tool mechanism arranged in the ring cutting box, the cable is placed on the workbench, the power assembly drives the top core structure to press the filler and conductor inside the sheath relative to the sheath to a set depth, the workbench is provided with an inner positioning structure and an outer positioning structure, the inner positioning structure and the outer positioning structure are arranged relatively to each other, the power assembly drives the inner positioning structure to hold the inner side surface of the inner sheath layer and drives the outer positioning structure to hold the outer side surface of the outer sheath layer to limit the position of the sheath, and the power assembly drives the cutter of the ring cutting tool mechanism to extend into the inner side of the sheath to cut the inner sheath layer.

[0005] After adopting the above technical scheme, the present invention has the following advantages: through the design of the inner positioning structure and the outer positioning structure, the inner and outer sides of the sheath are limited, which can effectively limit the deformation of the sheath, reduce the change in the position of the sheath, and ensure the accuracy of the cutting position, so that the inner sheath layer of the cable can be better cut, thereby improving the quality of the inner ring cutting of the cable sheath. The inner ring cutting method of the sheath avoids the damage to the armor layer caused by cutting from the outside, so that the armor layer on the outside of the cable can be kept intact. Of course, since the inner and outer sides of the sheath are limited, it is also convenient to cut the outer sheath layer, thereby improving the quality of the outer ring cutting of the sheath.

[0006] Furthermore, the inner positioning structure is provided with a first arcuate surface which is in contact with the inner side surface of the inner sheath layer, and the outer positioning structure is provided with a second arcuate surface which is in contact with the outer side surface of the outer sheath layer.

[0007] By adopting the above-mentioned technical solution, since the surface of the cable sheath is usually arc-shaped, the first arc-shaped surface and the second arc-shaped surface can fit tightly with the inner side surface of the inner sheath layer and the outer side surface of the outer sheath layer, ensuring that the sheath remains stable during the cutting process and will not move or shift, which helps to improve the cutting stability.

[0008] Furthermore, the first arcuate surface and the second arcuate surface are arranged opposite to each other.

[0009] With the above technical solution, the first curved surface and the second curved surface arranged opposite to each other can ensure that the pressure applied to the sheath is uniform, so as to avoid deformation or damage caused by excessive local pressure, which is particularly important for thinner or softer sheaths. The two curved surfaces are in contact with the inner side surface of the inner sheath layer and the outer side surface of the outer sheath layer at the same time, making the sheath more stable during the cutting process.

[0010] Furthermore, there are multiple inner positioning structures and outer positioning structures, and the multiple inner positioning structures and outer positioning structures are arranged on the workbench along the circumferential direction.

[0011] By adopting the above-mentioned technical solution, the multi-point support method improves the stability of cable fixation, reduces the movement or vibration of the sheath during cutting, and helps to improve the quality of the inner ring cutting of the cable sheath.

[0012] Furthermore, the outer positioning structure is slidably arranged on the workbench along the horizontal direction, and the inner positioning structure is arranged on the outer positioning structure and is located above the outer positioning structure.

[0013] With the above technical solution, the outer positioning structure can slide in the horizontal direction, which means that the position of the positioning structure can be flexibly adjusted according to the diameter of the cable to adapt to cables of different specifications, which increases the versatility of the device. The outer positioning structure can be easily moved to the optimal position to ensure that the sheath is accurately aligned and clamped, which can improve the accuracy and consistency of cutting.

[0014] Furthermore, the inner positioning structure includes a first base and an inner positioning portion, the first base is arranged on the outer positioning structure, and the inner positioning portion is slidably arranged on the first base along a horizontal direction.

[0015] With the above technical solution, since the inner positioning part can slide in the horizontal direction, it can be adjusted according to the diameter of the sheath. This enables the device to handle sheaths of different thicknesses, enhancing the versatility and flexibility of the device. By adjusting the position of the inner positioning part, the inner sheath layer can be more accurately aligned to ensure accurate positioning during cutting. This helps to improve the consistency and quality of cutting.

[0016] Furthermore, the outer positioning structure is also provided with a support step protruding in the horizontal direction and used to support the cable, and the inner positioning portion includes a horizontal part and a vertical part, the vertical part can extend into the inner side of the sheath, and the horizontal part is arranged relative to the support step to support the top surface of the sheath.

[0017] With the above technical solution, the support step provides an additional support point for the cable, ensuring that the sheath remains stable during cutting and reducing the possibility of movement or sliding. At the same time, the horizontal part of the inner positioning part cooperates with the support step to further fix the position of the sheath, facilitating cutting and improving cutting quality.

[0018] Furthermore, the first base and the external positioning structure are connected via a telescopic structure, and the telescopic structure can be telescoped in the vertical direction to adjust the distance between the horizontal part and the supporting step.

[0019] By adopting the above technical solution, the distance between the inner positioning part and the supporting step is adjusted through the telescopic structure, so that the equipment can handle sheaths of different heights and is also convenient for loading and unloading cables from the workbench.

[0020] Furthermore, the circular cutting tool mechanism includes a cutter, and the cutter is fixedly connected to the output end of the power assembly; and / or the circular cutting tool mechanism includes a cutter and an elastic member, and the cutter is connected to the output end of the power assembly via the elastic member.

[0021] By adopting the above-mentioned technical scheme, a cutter that can adapt to various installation methods can perform circular cutting. The cutter with an elastic member cuts the inner sheath layer, and the feed amount is controlled by the rebound force generated by the cutter hitting the armor layer.

[0022] Another object of the present invention is to provide a method for inner sheath circumcision, which adopts the inner sheath circumcision device of the cable sheath described in any one of the technical solutions above to perform circumcision, and is characterized in that it comprises the following steps:

[0023] S1: The power assembly drives the outer positioning structure to hold the outer side of the outer sheath layer to clamp the cable;

[0024] S2: The power assembly drives the top core structure to press the filler and the conductor inside the sheath down to a set depth relative to the sheath;

[0025] S3: Detect the cable height and determine whether the filler and conductor are pressed down to the set depth. If so, proceed to S4; otherwise, proceed to S2.

[0026] S4: the power assembly drives the inner positioning structure to hold the inner side of the inner jacket layer to limit the position of the jacket;

[0027] S5: The power assembly drives the cutter to move to the inner side of the cutting sheath to cut the inner sheath layer.

[0028] The above technical solution is adopted to ensure that the sheath will not move during the cutting process, thereby achieving high-quality cutting of the sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the cable sheath inner ring cutting device in the present invention;

[0031] Figure 2 It is a cross-sectional view of the cable sheath inner ring cutting device in the present invention;

[0032] Figure 3 It is a partial structural schematic diagram of the cable sheath inner ring cutting device in the present invention;

[0033] Figure 4 For the present invention Figure 3 A magnified view of the structure at A;

[0034] Figure 5 It is a partial structural schematic diagram of the cable sheath inner ring cutting device in the present invention;

[0035] Figure 6 A schematic diagram of another perspective of the local structure of the cable sheath inner ring cutting device in the present invention;

[0036] Figure 7 It is a partial structural cross-sectional view of the cable sheath inner ring cutting device in the present invention;

[0037] Figure 8 It is a flow chart of the sheath inner circumcision method of the present invention;

[0038] In the figure, 10, the ring cutting box; 11, the observation window; 20, the workbench; 21, the first slide; 30, the top core structure; 401, the cutter; 402, the elastic member; 50, the inner positioning structure; 51, the first arc surface; 52, the first base; 53, the inner positioning part; 531, the horizontal part; 532, the vertical part; 54, the second slide; 55, the telescopic structure; 551, the support rod; 553, the first positioning hole; 554, the third slide; 555, the positioning rod; 56, the second matching part; 60, the outer positioning structure; 61, the second arc surface; 62, the support step; 63, the first matching part; 70, the cable; 71, the sheath; 72, the armor layer; 73, the filler; 74, the conductor; 75, the inner sheath layer; 76, the outer sheath layer. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein.

[0041] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the processes does not mean the order of execution. The execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0042] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0043] It should be understood that in the present invention, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0044] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0045] Embodiment 1:

[0046] like Figures 1 to 7 As shown, the present invention provides a cable sheath inner ring cutting device, which is suitable for cutting a cable 70 having an armor layer 72 in a sheath 71. The cable 70 includes a sheath 71, a filler 73 and a conductor 74 located in the sheath 71. The sheath 71 includes an inner sheath layer 75, an armor layer 72 and an outer sheath layer 76 from the inside to the outside. The cable sheath inner ring cutting device includes a ring cutting box 10 and a workbench 20, a top core structure 30, a power component and a ring cutting tool mechanism arranged in the ring cutting box 10. The cable 70 is placed on the workbench 20, and the power component drives the top core structure 30 presses the filler 73 and the conductor 74 on the inner side of the sheath 71 to a set depth relative to the sheath 71, the workbench 20 is provided with an inner positioning structure 50 and an outer positioning structure 60, the inner positioning structure 50 and the outer positioning structure 60 are arranged relatively to each other, the power component drives the inner positioning structure 50 to hold the inner side of the inner sheath layer 75 and drives the outer positioning structure 60 to hold the outer side of the outer sheath layer 76 to limit the position of the sheath 71, the power component drives the cutter 401 of the circular cutting tool mechanism to extend into the inner side of the sheath 71 to cut the inner sheath layer 75.

[0047] Through the design of the inner positioning structure 50 and the outer positioning structure 60, a limiting effect is exerted on the inner and outer sides of the sheath 71, which can effectively limit the deformation of the sheath 71, reduce the change in the position of the sheath 71, ensure the accuracy of the cutting position, and enable the inner sheath layer 75 of the cable 70 to be better cut, thereby improving the quality of the inner ring cutting of the sheath 71. The inner ring cutting method of the sheath 71 avoids possible damage to the armor layer 72 caused by cutting from the outside, thereby keeping the armor layer 72 on the outside of the cable 70 intact. Of course, since both the inner and outer sides of the sheath 71 are limited, it is also convenient to cut the outer sheath layer 76, thereby improving the quality of the outer ring cutting of the sheath 71.

[0048] It should be noted that the top core structure 30 is located above the workbench 20 and is specifically driven by a linear drive. The force component drives the cutter 401 of the circular cutting tool mechanism to extend into the inner side of the sheath 71, and drives the cutter 401 to cut the inner sheath layer 75 along a circular motion with the center of the sheath 71 as the center point.

[0049] In order to further facilitate cutting, multiple inner positioning structures 50 and outer positioning structures 60 are provided, and multiple inner positioning structures 50 and outer positioning structures 60 are arranged on the workbench 20 along the circumferential direction. The multi-point support method improves the stability of the fixing of the sheath 71, reduces the movement or vibration of the sheath 71 during the cutting process, and helps to improve the quality of the inner ring cutting of the sheath 71. In this embodiment, three inner positioning structures 50 and three outer positioning structures 60 are provided.

[0050] The inner positioning structure 50 is provided with a first arcuate surface 51 which fits with the inner side surface of the inner sheath layer 75, and the outer positioning structure 60 is provided with a second arcuate surface 61 which fits with the outer side surface of the outer sheath layer 76. The first arcuate surface 51 and the second arcuate surface 61 can fit closely with the inner and outer surfaces of the sheath 71, ensuring that the cable 70 remains stable during the cutting process without movement or deviation, which helps to improve the cutting stability.

[0051] In this embodiment, the first curved surface 51 and the second curved surface 61 are arranged opposite to each other, and the first curved surface 51 and the second curved surface 61 are oriented in opposite directions, which can ensure that the pressure applied to the sheath 71 is uniform, so as to avoid deformation or damage caused by excessive local pressure, which is particularly important for thinner or softer sheaths 71. The inner and outer surfaces of the sheath 71 can be pressed against each other at the same time, making the sheath 71 more stable during the cutting process.

[0052] Specifically, the outer positioning structure 60 is slidably arranged on the workbench 20 in the horizontal direction, and the inner positioning structure 50 is arranged on the outer positioning structure and is located above the outer positioning structure. The outer positioning structure 60 can slide in the horizontal direction, which means that the position of the positioning structure can be flexibly adjusted according to the diameter of the cable 70 to adapt to cables 70 of different specifications, which increases the versatility of the device. The outer positioning structure 60 can be easily moved to the optimal position to ensure that the sheath 71 is accurately aligned and clamped, which can improve the accuracy and consistency of cutting.

[0053] In this embodiment, the workbench 20 is a circular structure. In order to make the outer positioning structure 60 slide more stably, a first slide 21 is provided on the workbench 20. The first slide 21 extends toward the center of the workbench 20. The outer positioning structure 60 is provided with a first matching portion 63 that matches the first slide 21 to ensure that the outer positioning structure 60 slides more smoothly.

[0054] The inner positioning structure 50 includes a first base 52 and an inner positioning portion 53, wherein the first base 52 is disposed on the outer positioning structure 60, and the inner positioning portion 53 is slidably disposed on the first base 52 in a horizontal direction. The inner positioning portion 53 can be adjusted according to the inner diameter of the sheath 71. This enables the device to handle sheaths 71 of different thicknesses, thereby enhancing the versatility and flexibility of the device. By adjusting the position of the inner positioning portion 53, the inner side of the sheath 71 can be more accurately aligned to ensure accurate positioning during cutting. This helps to improve the consistency and quality of cutting.

[0055] Furthermore, a second slide 54 is provided on the first base 52 , and the second slide 54 and the first slide 21 extend in the same direction. The inner positioning portion 53 is provided with a second matching portion 56 matching with the second slide 54 , so as to ensure that the inner positioning structure 50 slides more smoothly.

[0056] In order to limit the upper and lower ends of the cable 70 and further prevent the cable 70 from loosening, the outer positioning structure 60 is also provided with a support step 62 protruding in the horizontal direction and used to support the cable 70. The inner positioning part 53 includes a horizontal part 531 and a vertical part 532. The vertical part 532 can extend into the inner side of the inner sheath layer 75. The horizontal part 531 is arranged relative to the support step 62 to support the top surface of the sheath 71. The support step 62 provides an additional support point for the cable 70 to ensure that the cable 70 remains stable during the cutting process and reduces the possibility of movement or sliding. At the same time, the horizontal part 531 of the inner positioning part 53 cooperates with the support step 62 to further fix the position of the cable 70, which facilitates cutting and improves the cutting quality.

[0057] Since different cables 70 have different heights, in this embodiment, the first base 52 and the outer positioning structure are connected by a telescopic structure 55, and the telescopic structure 55 can be telescoped in the vertical direction to adjust the distance between the horizontal part 531 and the supporting step 62. By adjusting the distance between the inner positioning part 53 and the supporting step 62 through the telescopic structure 55, the device can handle cables 70 of different heights, and it is also convenient to load and remove the cables 70 from the workbench 20.

[0058] The telescopic structure 55 includes a positioning rod 555, a third slideway 554 provided on the outer positioning structure 60, and a support rod 551 located in the third slideway 554. One end of the support rod 551 is fixedly connected to the first base 52. The support rod 551 is provided with a first positioning hole 553 arranged along the radial direction of the third slideway 554. A plurality of second positioning holes are arranged in the vertical direction on the outer positioning structure 60. The axial directions of the plurality of second positioning holes are consistent with the radial direction of the third slideway 554, and the plurality of second positioning holes are connected to the third slideway 554. The positioning rod 555 is inserted into the second positioning hole and the first positioning hole 553 in sequence to fix the support rod 551 to fix the first base 52. The support rod 551 can be moved to connect different second positioning holes with the first positioning hole 553 to change the height of the first base 52.

[0059] The cutter mechanism includes a cutter 401 and an elastic member 402. The cutter 401 is connected to the output end of the power assembly through the elastic member 402. The cutter 401 with the elastic member 402 cuts the inner side of the sheath 71, and the cutter 401 hits the armor layer 72 to generate a rebound force to control the feed amount. A suitable circular cutting tool mechanism can be selected as needed. Among them, the cutter 401 is provided with a large and a small one. The large cutter 401 is used to circularly cut the outer side of the sheath 71, and the small cutter 401 is used to circularly cut the inner side of the sheath 71.

[0060] In order to ensure that the top core structure 30 presses the filler 73 and the conductor 74 inside the sheath 71 to a set depth relative to the sheath 71 more accurately, a distance sensor is provided to detect the height of the cable 70. By detecting the height of the cable 70, the depth to which the top core structure 30 presses the filler 73 and the conductor 74 inside the sheath 71 can be detected.

[0061] Since the position of the cable 70 on the workbench 20 is fixed, in order to improve the cutting accuracy, the circular cutting tool mechanism is also provided with a displacement sensor for detecting the movement of the cutter 401 to obtain the cutting amount and ensure more accurate cutting.

[0062] Since the top core structure 30 presses the filler 73 and the conductor 74 inside the sheath 71 relative to the sheath 71 to a set depth that is usually small, the vertical height of the first arcuate surface 51 is usually smaller than the vertical height of the second arcuate surface 61 .

[0063] In order to increase cutting safety and facilitate observation, the circumcision box 10 includes an observation window 11, through which the circumcision situation can be observed in real time, and the observation window 11 can be opened.

[0064] It can be understood that in other embodiments, the inner positioning structure and the outer positioning structure can be positioning rings, which are sleeved on the outer side of the outer sheath layer and abut against the inner side of the inner sheath layer. The positioning rings have multiple specifications and can be replaced to adapt to cables of different sizes.

[0065] It can be understood that in other embodiments, the cutter can be directly connected to the output end of the power assembly.

[0066] Embodiment 2:

[0067] like Figure 8 As shown, this embodiment discloses a sheath inner ring cutting method, which uses the cable sheath inner ring cutting device in any one of the above technical solutions to perform ring cutting, and is characterized in that it includes the following steps:

[0068] S1: The power assembly drives the outer positioning structure to hold the outer side of the outer sheath layer to clamp the cable;

[0069] S2: The power assembly drives the top core structure to press the filler and conductor inside the sheath down to a set depth relative to the sheath;

[0070] S3: Detect the cable height and determine whether the filler and conductor are pressed down to the set depth. If so, proceed to S4; otherwise, proceed to S2.

[0071] S4: The power assembly drives the inner positioning structure to hold the inner side surface of the inner sheath layer to limit the position of the sheath;

[0072] S5: The power assembly drives the cutter to move to the inside of the cutting sheath to cut the inner sheath layer.

[0073] The above technical solution is adopted to ensure that the cable will not move during the cutting process, thereby achieving high-quality cutting of the sheath.

[0074] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A cable sheath inner ring cutting device, suitable for cutting cables with armored layers in the sheath, the cable sheath inner ring cutting device comprises a ring cutting box and a workbench, a top core structure, a power assembly and a ring cutting tool mechanism arranged in the ring cutting box, the cable is placed on the workbench, the power assembly drives the top core structure to press the filler and conductor inside the sheath relative to the sheath to a set depth, characterized in that: The workbench is provided with an inner positioning structure and an outer positioning structure, and the inner positioning structure and the outer positioning structure are arranged relative to each other. The power component drives the inner positioning structure to hold the inner side surface of the inner sheath layer and drives the outer positioning structure to hold the outer side surface of the outer sheath layer to limit the position of the sheath. The power component drives the cutter of the circular cutting tool mechanism to extend into the inner side of the sheath to cut the inner sheath layer.

2. A cable sheath inner ring cutting device according to claim 1, characterized in that: The inner positioning structure is provided with a first arcuate surface which is in contact with the inner side surface of the inner sheath layer, and the outer positioning structure is provided with a second arcuate surface which is in contact with the outer side surface of the outer sheath layer.

3. A cable sheath inner ring cutting device according to claim 1, characterized in that: The first arcuate surface and the second arcuate surface are arranged opposite to each other.

4. A cable sheath inner ring cutting device according to claim 1, characterized in that: There are a plurality of inner positioning structures and outer positioning structures, and the plurality of inner positioning structures and outer positioning structures are arranged on the workbench along the circumferential direction.

5. A cable sheath inner ring cutting device according to claim 1, characterized in that: The outer positioning structure is slidably arranged on the workbench along a horizontal direction, and the inner positioning structure is arranged on the outer positioning structure and is located above the outer positioning structure.

6. A cable sheath inner ring cutting device according to claim 5, characterized in that: The inner positioning structure comprises a first base and an inner positioning portion, wherein the first base is arranged on the outer positioning structure, and the inner positioning portion is arranged on the first base in a sliding manner in a horizontal direction.

7. A cable sheath inner ring cutting device according to claim 6, characterized in that: The outer positioning structure is also provided with a support step protruding in the horizontal direction and used to support the cable. The inner positioning part includes a horizontal part and a vertical part. The vertical part can extend into the inner side of the sheath. The horizontal part is arranged relative to the support step to support the top surface of the sheath.

8. A cable sheath inner ring cutting device according to claim 7, characterized in that: The first base and the external positioning structure are connected via a telescopic structure, and the telescopic structure can be telescoped in a vertical direction to adjust the distance between the horizontal part and the supporting step.

9. A cable sheath inner ring cutting device according to claim 1, characterized in that: The circular cutting tool mechanism includes a cutter, and the cutter is fixedly connected to the output end of the power assembly; and / or the circular cutting tool mechanism includes a cutter and an elastic member, and the cutter is connected to the output end of the power assembly through the elastic member.

10. A method for inner sheath ring cutting, using the cable sheath inner sheath ring cutting device according to any one of claims 1 to 9 for ring cutting, characterized in that: The steps include: S1: the power assembly drives the outer positioning structure to hold the outer side surface of the outer sheath layer to clamp the cable; S2: The power assembly drives the top core structure to press the filler and the conductor inside the sheath down to a set depth relative to the sheath; S3: Detect the cable height and determine whether the filler and conductor are pressed down to the set depth. If so, proceed to S4; otherwise, proceed to S2. S4: the power assembly drives the inner positioning structure to hold the inner side surface of the inner jacket layer to limit the position of the jacket; S5: The power assembly drives the cutter to move to the inner side of the cutting sheath to cut the inner sheath layer.

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