Method and system for rotary-cut sampling of polypropylene insulated power cable

Abstract

The invention discloses a method and system for rotary-cut sampling of a polypropylene insulated power cable, and the method comprises the steps: cutting an insulated power cable with a preset length, positioning the insulated power cable along the axial center, fixing the insulated power cable on a rack, and driving the insulated power cable to rotate; based on rotary cutting parameters set by the PLC, a motor drives a transmission lead screw to start a rotary cutting blade, and the rotating speed driven by the motor is constant; the cutting edge of the rotary cutting blade is parallel to the axial direction of the insulated power cable; the rotary cutting blade performs feeding motion in the direction perpendicular to the insulated power cable based on the set feeding distance, and continuous equal-thickness rotary cutting is performed on the insulated power cable in the axial direction. According to the rotary-cut sampling method and system for the insulating layer of the polypropylene insulated power cable, flexible sampling of different widths of the polypropylene insulated power cable is achieved through the functions of axial center positioning, rotating speed conduction, stable control and the like of the power cable.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene insulated cable processing, and more specifically to a method and a system for rotary cutting and sampling of polypropylene insulated power cables. Background Art

[0002] In the existing polypropylene insulated power cable sampling process, only ordinary axial slicing technology can be used. However, the sample size obtained by this processing method is very small. For medium-voltage power cables, the sample width does not exceed 3 cm. For breakdown performance tests or dielectric loss tests, when the sample is required to be at least 6 cm, it is difficult to meet the requirements.

[0003] Therefore, it is necessary to propose a new rotary cutting method to peel off the polypropylene cable insulation in circles along the radial direction of the cable. Summary of the invention

[0004] The technical solution of the present invention provides a method and system for rotary cutting and sampling of polypropylene insulated power cables, so as to solve the problem of how to uniformly sample the rotary cutting of polypropylene insulated power cables.

[0005] In order to solve the above problems, the present invention provides a method for rotary cutting and sampling of polypropylene insulated power cables, the method comprising:

[0006] Cutting an insulated power cable of a preset length, positioning the insulated power cable along the axial center and fixing it on the frame, and driving the insulated power cable to rotate;

[0007] Based on the peeling parameters set by the PLC controller, the peeling blade is started by driving the transmission screw through the motor, and the rotation speed of the motor drive is constant; the blade of the peeling blade is parallel to the axial direction of the insulated power cable;

[0008] The rotary cutting blade performs a feeding motion in a direction perpendicular to the insulated power cable based on a set feed distance, so that the insulated power cable is continuously rotary cut with equal thickness in an axial direction.

[0009] Preferably, the feed distance is set according to the following formula:

[0010]

[0011] Where C1C2 is the distance from the center of the insulated power cable C1 to the center of the rotary cutting blade C2, φ g It represents the maximum diameter of the insulated power cable, φ0 represents the remaining diameter of the insulated power cable at any time, and the center moment α0 of the two transmission screws is a constant.

[0012] Preferably, the motor drive is a total drive with a total power of at least 3KW;

[0013] There are two transmission screws, each of which is driven by a single motor. The power of the single motor is at least 1.5KW, the input speed is at least 1440r / min, and the temperature is controlled not to exceed 40°C.

[0014] Preferably, the transmission screw is also provided with a reducer, the transmission ratio of the reducer is at least 10P, and the output power is at least 1.5kW.

[0015] Preferably, the allowable stress of the screw of the transmission screw is at least 94.00 MPa, the allowable bending stress of the screw is at least 40 MPa, and the allowable shear stress of the screw is at least 30 MPa.

[0016] Preferably, before positioning the insulated power cable along the axial center and fixing it on the frame, the method further comprises:

[0017] The insulated power cable is placed in an air oven for 15 to 20 minutes, and the temperature of the air oven is set at 100 to 150°C.

[0018] Based on another aspect of the present invention, the present invention provides a system for rotary cutting and sampling of polypropylene insulated power cables, the system comprising:

[0019] An initial unit, used for cutting an insulated power cable of a preset length, positioning the insulated power cable along the axial center and fixing it on a frame, and the insulated power cable is driven to rotate;

[0020] A driving unit, for starting the peeling blade by driving a transmission screw through a motor based on the peeling parameters set by the PLC controller, wherein the rotation speed of the motor drive is constant; the blade of the peeling blade is parallel to the axial direction of the insulated power cable;

[0021] The rotary cutting unit is used for continuously rotary cutting the insulated power cable with equal thickness in the axial direction by feeding the rotary cutting blade in a direction perpendicular to the insulated power cable based on a set feed distance.

[0022] Preferably, the rotary cutting unit is further used to set the feed distance according to the following formula:

[0023]

[0024] Where C1C2 is the distance from the center of the insulated power cable C1 to the center of the rotary cutting blade C2, φ g It represents the maximum diameter of the insulated power cable, φ0 represents the remaining diameter of the insulated power cable at any time, and the center moment α0 of the two transmission screws is a constant.

[0025] Preferably, the motor drive is a total drive with a total power of at least 3KW;

[0026] There are two transmission screws, each of which is driven by a single motor. The power of the single motor is at least 1.5KW, the input speed is at least 1440r / min, and the temperature is controlled not to exceed 40°C.

[0027] Preferably, the transmission screw is also provided with a reducer, the transmission ratio of the reducer is at least 10P, and the output power is at least 1.5kW.

[0028] Preferably, the allowable stress of the screw of the transmission screw is at least 94.00 MPa, the allowable bending stress of the screw is at least 40 MPa, and the allowable shear stress of the screw is at least 30 MPa.

[0029] Preferably, before positioning the insulated power cable along the axial center and fixing it on the frame, the method further comprises:

[0030] The insulated power cable is placed in an air oven for 15 to 20 minutes, and the temperature of the air oven is set at 100 to 150°C.

[0031] According to another aspect of the present invention, the present invention provides a computer-readable storage medium storing a computer program for executing a method for rotary cutting sampling of polypropylene insulated power cables.

[0032] Based on another aspect of the present invention, the present invention provides an electronic device, the electronic device comprising: a processor and a memory; wherein,

[0033] The memory is a memory for storing instructions executable by the processor;

[0034] The processor is used to read the executable instructions from the memory and execute the instructions to implement a method for rotary cutting sampling of polypropylene insulated power cables.

[0035] The technical solution of the present invention provides a method and system for rotary cutting sampling of polypropylene insulated power cables, wherein the method includes: cutting an insulated power cable of a preset length, positioning the insulated power cable along the axial center and fixing it on a frame, and the insulated power cable is driven to rotate; based on the rotary cutting parameters set by the PLC controller, the rotary cutting blade is started by driving the transmission screw by a motor, and the rotation speed driven by the motor is constant; the blade of the rotary cutting blade is parallel to the axial direction of the insulated power cable; the rotary cutting blade is fed in a direction perpendicular to the insulated power cable based on the set feed distance, and the insulated power cable is continuously rotary cut with equal thickness in the axial direction. The present invention proposes a method for rotary cutting sampling of the insulation layer of polypropylene insulated power cables, which can perform rotary cutting sampling after the PLC processes the external input signal through the functions of axial center positioning of the power cable, transmission and stable control of the rotation speed, so as to realize flexible sampling of different widths of polypropylene insulated power cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0037] Figure 1 A flow chart of a method for rotary cutting and sampling of polypropylene insulated power cables according to a preferred embodiment of the present invention;

[0038] Figure 2 It is a structural diagram of a rotary cutting sampling device for polypropylene insulated power cable according to a preferred embodiment of the present invention;

[0039] Figure 3 A schematic diagram of ring cutting of an insulating layer according to a preferred embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the result of ring cutting of the insulating layer according to a preferred embodiment of the present invention;

[0041] Figure 5 The present invention is a structural diagram of a system for rotary cutting and sampling of polypropylene insulated power cables according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0042] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0043] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0044] Figure 1 The present invention is a flow chart of a method for rotary cutting and sampling of polypropylene insulated power cables according to a preferred embodiment of the present invention.

[0045] The present invention provides a device for rotary cutting and sampling of polypropylene insulated power cables to solve the problem that when the cable sample has a small diameter, the cable sample has insufficient support on both sides and weak rigidity in the middle, which often causes the knife to let go and jump, resulting in a large thickness error of the sample, and the cable sample cannot be rotary cut when the diameter is small. There are very high requirements for the axial center positioning of the cable, the feed size during rotary cutting, and stable rotary cutting, which require special devices to achieve.

[0046] like Figure 1 As shown, the present invention provides a method for rotary cutting and sampling of polypropylene insulated power cables, the method comprising:

[0047] Step 101: cutting an insulated power cable of a preset length, positioning the insulated power cable along the axial center and fixing it on a frame, and driving the insulated power cable to rotate;

[0048] Step 102: Based on the peeling parameters set by the PLC controller, the peeling blade is started by driving the transmission screw through the motor, and the rotation speed driven by the motor is constant; the blade of the peeling blade is parallel to the axial direction of the insulated power cable;

[0049] Step 103: The rotary cutting blade performs a feeding motion in a direction perpendicular to the insulated power cable based on a set feed distance, so as to perform continuous rotary cutting of equal thickness on the insulated power cable in an axial direction.

[0050] Preferably, the feed distance is set according to the following formula:

[0051]

[0052] Where C1C2 is the distance from the center of the insulated power cable C1 to the center of the rotary cutting blade C2, φ g It represents the maximum diameter of the insulated power cable, φ0 represents the remaining diameter of the insulated power cable at any time, and the center moment α0 of the two transmission screws is a constant.

[0053] The cable sample of the present invention is driven to rotate on the device, and the rotary cutter blade installed on the cutter bed is parallel to the axis of the clamping shaft. During rotary cutting, the rotary cutter blade and the cable sample make a relative linear feeding motion along the perpendicular direction thereof, and a continuous sample of equal thickness is rotary cut along the axial direction of the cable. Whether it is constant speed rotary cutting or constant line speed rotary cutting, in order to obtain a sample of a certain thickness, the feed amount of the cutter should be kept constant for each rotation of the cable sample, and the feed amount is equal to the single plate thickness of the sample. By changing the feed amount of the cutter, samples of different thicknesses can be obtained.

[0054] The present invention first provides a method for building the device. The overall structure of the peeling machine and the drive feed mechanism are simplified. An automated control system is used to control the machine tool so that it can be suitable for peeling samples of different thicknesses. The feeding motion conforms to the law of cable diameter change, so that the thickness of the peeled sample is uniform, and the energy consumption of the entire system is reduced while ensuring the quality of peeling. In order to achieve constant linear speed peeling, the drive speed is constant during peeling. As the cable diameter continues to decrease, the cable sample performs nonlinear accelerated rotational motion, which requires the drive feed to adapt to it. The feed speed is inversely proportional to the remaining diameter of the cable sample and directly proportional to the peeling thickness. Obviously, relying on a simple mechanical structure, a feed system that can meet variable acceleration motion will be very complex. Through calculation, the knife bed feed conforms to the following formula:

[0055]

[0056] Where C1C2 is the distance from the center of the insulated power cable C1 to the center of the rotary cutting blade C2, φ g It represents the maximum diameter of the insulated power cable, φ0 represents the remaining diameter of the insulated power cable at any time, and the center moment α0 of the two transmission screws is a constant.

[0057] Preferably, the motor drive is a total drive with a total power of at least 3KW;

[0058] There are two transmission screws, each of which is driven by a single motor. The power of the single motor is at least 1.5KW, the input speed is at least 1440r / min, and the temperature is controlled not to exceed 40°C.

[0059] Preferably, the transmission screw is also provided with a reducer, the transmission ratio of the reducer is at least 10P, and the output power is at least 1.5kW.

[0060] Preferably, the allowable stress of the screw of the transmission screw is at least 94.00 MPa, the allowable bending stress of the screw is at least 40 MPa, and the allowable shear stress of the screw is at least 30 MPa.

[0061] In the construction of the device of the present invention, it is necessary to select a frame, a motor drive, a reducer, a transmission screw, a rotary cutter system and a PLC controller. The frame structure adopts a triangular structure, which is simple, firm and easy to process. The total feed power selected by the motor drive is preferably 3KW, and the two screws are driven separately. The single motor is preferably: P=1.5KW, the input speed is preferably 1440r / min, the temperature does not exceed 40°C, and reverse braking is possible; the reducer transmission ratio is preferably i=10, and the output power is preferably P=1.5kW; the allowable pressure of the transmission screw is preferably 21.50MPa, the allowable stress of the screw material is preferably 94.00MPa, the allowable bending stress of the screw is preferably 40MPa, and the allowable shear stress of the screw is preferably 30MPa; the rotary cutter should be able to effectively rotary cut the veneer, the back angle should be properly polished, generally preferably about 20°, the tool holder has sufficient rigidity to withstand the maximum rotary cutting resistance, and the knife door gap and rotary cutting angle can be adjusted; the programmable controller (PLC) is used as the controller, and the frequency conversion is used as the driver of the feed motor.

[0062] Preferably, before the insulated power cable is positioned along the axial center and fixed on the frame, the method further comprises:

[0063] The insulated power cable is placed in an air oven for 15 to 20 minutes, and the temperature of the air oven is set to 100 to 150°C.

[0064] Before the peeling starts, the polypropylene cable sample is placed in an air oven, the temperature is preferably set to 135°C, the time is set to 15 to 20 minutes, preferably 15 minutes, and the sample is coaxially fixed on a rack after being taken out. When a "start" button is pressed, the system starts, executes a "start" subroutine, waits for the thickness to be set in a PLC, and automatically waits for the peeling to start according to the selected thickness parameter. After the switch signal generated by the "peeling start" button reaches the PLC, the switch signal is output to the frequency converter by a pulse I / 0 module of the PLC. When the PLC receives the upper limit switch signal, the peeling ends, the reversing relay is turned on, the feed motor reverses, and the feed motor stops after being driven back to the initial position, waiting for the next peeling.

[0065] The present invention provides a device design scheme for rotary cutting and sampling of the insulating layer of a polypropylene insulated power cable, which includes a parameter selection method and device design for core systems such as a selection frame, a motor drive, a reducer, a transmission screw, a rotary cutter system and a PLC controller;

[0066] The present invention proposes a method for rotary cutting and sampling of the insulation layer of a polypropylene insulated power cable, including functions such as axial center positioning of the cable, transmission and stability control of the rotation speed, etc. The method can perform rotary cutting and sampling after the PLC processes the external input signal, thereby realizing flexible sampling of different widths of the polypropylene insulated power cable.

[0067] The present invention proposes a method for heating a polypropylene insulated power cable before rotary cutting, which is convenient for reducing the hardness and rigidity of the polypropylene insulated power cable, making the cutting process smoother and more stable, and ensuring that the thickness error of the rotary cut sample is not large, and rotary cutting can be performed even when the cable sample is very small.

[0068] The present invention solves the problem of the traditional method of only axial cutting. It can not only realize sampling with a large width, but also the sampling width is determined by the cutter head, which has great flexibility and can realize cutting of samples with a maximum width of 20 cm, which can meet the test of all power cable material tests.

[0069] The invention can peel off the polypropylene cable insulation in circles along the radial direction of the cable, and can facilitate the axial center positioning of the cable, set the feed size in rotary cutting and increase the stable rotary cutting degree, which has a great improvement effect on defect-free sampling of insulation.

[0070] The present invention uses a fixed support device for rotary cutting and sampling of polypropylene insulated power cables, such as Figure 2 As shown, it can solve the problem of knife letting off and knife jumping caused by insufficient support on both sides of the cable sample and weak rigidity in the middle when the cable sample has a small diameter. The thickness error of the rotary cut sample is not large, and rotary cutting can be performed even when the cable sample is very small.

[0071] The present invention first cuts a cable segment of about 30 cm in length, removes the cable aluminum sheath and buffer layer to obtain a cylindrical cable insulation, places the cylindrical cable in an oven at 135° C. for 15 minutes, and then takes it out and fixes it on the above device.

[0072] Press the start button to start feeding, then set the external size of the cable sample to 50mm, the peeling thickness to 0.2mm and the minimum sample thickness to 52mm, then press the "peeling start" button, and the generated switch signal will be sent to the PLC, and then the pulse I / 0 module of the PLC will output it to the inverter. When the PLC receives the upper limit switch signal, the peeling ends, the reversing relay is turned on, the feed motor reverses, and the drive returns to the initial position. After that, the feed motor stops and waits for the next peeling. In this way, you can use a 10cm wide blade to cut the insulation layer and obtain a thin sheet sample with a thickness of about 0.185 to 0.245mm, such as Figure 3 , 4 shown.

[0073] Figure 5 The present invention is a structural diagram of a system for rotary cutting and sampling of polypropylene insulated power cables according to a preferred embodiment of the present invention.

[0074] like Figure 5 As shown, the present invention provides a system for rotary cutting and sampling of polypropylene insulated power cables, the system comprising:

[0075] The initial unit 501 is used to cut the insulated power cable of a preset length, position the insulated power cable along the axial center and fix it on the frame, and the insulated power cable is driven to rotate;

[0076] The driving unit 502 is used to start the peeling blade by driving the transmission screw through the motor based on the peeling parameters set by the PLC controller, and the rotation speed driven by the motor is constant; the blade of the peeling blade is parallel to the axial direction of the insulated power cable;

[0077] The rotary cutting unit 503 is used to perform continuous rotary cutting of equal thickness on the insulated power cable in the axial direction by feeding the rotary cutting blade in a direction perpendicular to the insulated power cable based on a set feed distance.

[0078] Preferably, the peeling unit 503 is further used to set the feed distance according to the following formula:

[0079]

[0080] Where C1C2 is the distance from the center of the insulated power cable C1 to the center of the rotary cutting blade C2, φ g It represents the maximum diameter of the insulated power cable, φ0 represents the remaining diameter of the insulated power cable at any time, and the center moment α0 of the two transmission screws is a constant.

[0081] Preferably, the motor drive is a total drive with a total power of at least 3KW;

[0082] There are two transmission screws, each of which is driven by a single motor. The power of the single motor is at least 1.5KW, the input speed is at least 1440r / min, and the temperature is controlled not to exceed 40°C.

[0083] Preferably, the transmission screw is also provided with a reducer, the transmission ratio of the reducer is at least 10P, and the output power is at least 1.5kW.

[0084] Preferably, the allowable stress of the screw of the transmission screw is at least 94.00 MPa, the allowable bending stress of the screw is at least 40 MPa, and the allowable shear stress of the screw is at least 30 MPa.

[0085] Preferably, before the insulated power cable is positioned along the axial center and fixed on the frame, the method further comprises:

[0086] The insulated power cable is placed in an air oven for 10 to 15 minutes, and the temperature of the air oven is set to 100 to 150°C.

[0087] A system for rotary cutting and sampling of polypropylene insulated power cables in a preferred embodiment of the present invention corresponds to a method for rotary cutting and sampling of polypropylene insulated power cables in another preferred embodiment of the present invention, and will not be described in detail here.

[0088] The present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is used to execute a method for rotary cutting and sampling of polypropylene insulated power cables.

[0089] The present invention provides an electronic device, the electronic device comprising: a processor and a memory; wherein:

[0090] Memory, a memory for storing processor executable instructions;

[0091] The processor is used for reading executable instructions from the memory and executing the instructions to implement a method for rotary cutting sampling of polypropylene insulated power cable.

[0092] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0093] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0096] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0097] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0098] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0099] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / / the [means, component, etc.]" are to be openly interpreted as at least one instance of a means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A method for rotary cutting and sampling of polypropylene insulated power cables, the method comprising: Cutting an insulated power cable of a preset length, positioning the insulated power cable along the axial center and fixing it on the frame, and driving the insulated power cable to rotate; Based on the peeling parameters set by the PLC controller, the peeling blade is started by driving the transmission screw through the motor, and the rotation speed of the motor drive is constant; the blade of the peeling blade is parallel to the axial direction of the insulated power cable; The rotary cutting blade performs a feeding motion in a direction perpendicular to the insulated power cable based on a set feed distance, so that the insulated power cable is continuously rotary cut with equal thickness in an axial direction.

2. The method according to claim 1, comprising setting the feed distance according to the following formula: in, C1C2 is the distance from the center of the insulated power cable C1 to the center of the rotary cutting blade C2, φ g It represents the maximum diameter of the insulated power cable, φ0 represents the remaining diameter of the insulated power cable at any time, and the center moment α0 of the two transmission screws is a constant.

3. The method according to claim 1, wherein the motor drive is a total drive with a total power of at least 3KW; There are two transmission screws, each of which is driven by a single motor. The power of the single motor is at least 1.5KW, the input speed is at least 1440r / min, and the temperature is controlled not to exceed 40°C.

4. According to the method of claim 1, the transmission screw is also provided with a reducer, the transmission ratio of the reducer is at least 10P, and the output power is at least 1.5kW.

5. The method according to claim 1, wherein the allowable stress of the screw of the transmission screw is at least 94.00 MPa, the allowable bending stress of the screw is at least 40 MPa, and the allowable shear stress of the screw is at least 30 MPa.

6. The method according to claim 1, before positioning the insulated power cable along the axial center and fixing it on the frame, further comprises: The insulated power cable is placed in an air oven for 15 to 20 minutes, and the temperature of the air oven is set at 100 to 150°C.

7. A system for rotary cutting and sampling of polypropylene insulated power cables, the system comprising: An initial unit, used for cutting an insulated power cable of a preset length, positioning the insulated power cable along the axial center and fixing it on a frame, and the insulated power cable is driven to rotate; A driving unit, for starting the peeling blade by driving a transmission screw through a motor based on the peeling parameters set by the PLC controller, wherein the rotation speed of the motor drive is constant; the blade of the peeling blade is parallel to the axial direction of the insulated power cable; The rotary cutting unit is used for continuously rotary cutting the insulated power cable with equal thickness in the axial direction by feeding the rotary cutting blade in a direction perpendicular to the insulated power cable based on a set feed distance.

8. The system according to claim 7, wherein the rotary cutting unit is further configured to set the feed distance according to the following formula: in, C1C2 is the distance from the center of the insulated power cable C1 to the center of the rotary cutting blade C2, φ g It represents the maximum diameter of the insulated power cable, φ0 represents the remaining diameter of the insulated power cable at any time, and the center moment α0 of the two transmission screws is a constant.

9. The system according to claim 7, wherein the motor drive is a total drive with a total power of at least 3KW; There are two transmission screws, each of which is driven by a single motor. The power of the single motor is at least 1.5KW, the input speed is at least 1440r / min, and the temperature is controlled not to exceed 40°C.

10. The system according to claim 7, wherein the transmission screw is further provided with a reducer, the transmission ratio of the reducer is at least 10P, and the output power is at least 1.5 kW.

11. The system according to claim 7, wherein the allowable stress of the screw of the transmission screw is at least 94.00 MPa, the allowable bending stress of the screw is at least 40 MPa, and the allowable shear stress of the screw is at least 30 MPa.

12. The system according to claim 7, before the insulated power cable is positioned along the axial center and fixed on the frame, further comprising: The insulated power cable is placed in an air oven for 15 to 20 minutes, and the temperature of the air oven is set at 100 to 150°C.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 6.

14. An electronic device, characterized in that: The electronic device comprises: a processor and a memory; wherein, The memory is a memory for storing instructions executable by the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 1 to 6.

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