A reaction force cone cutting device for main insulation layer of 10kV cable in distribution network and its working method

Abstract

The present invention relates to a distribution network 10kV cable main insulation layer reaction force cone cutting device in the field of high-voltage cable manufacturing technology, comprising a device shell, a cable fixing mechanism is fixedly installed at one end of the device shell, a tool feeding mechanism is arranged at the other end of the device shell, the tool feeding mechanism is rotatably installed with the inner wall of the device shell through a bearing, an electric drive mechanism is installed on the outer side of the device shell, and the electric drive mechanism is connected to the tool feeding mechanism through a transmission mechanism. The present invention adopts a three-leaf forming knife design based on a standard complex logarithmic curve, and has an optimized reaction force cone surface shape and surface smoothness after cutting. The equipment is compact and portable, and can realize automation, optimization, and automatic stripping of reaction force cone cutting, thereby greatly improving work quality.

Description

Technical Field

[0001] The invention relates to a reaction force cone cutting device for main insulation layer of a 10kV cable in a distribution network and a working method thereof, belonging to the technical field of high-voltage cable manufacturing. Background Art

[0002] As society's reliance on electricity continues to increase and urban construction beautification needs to be met, the urban cable rate is rising year by year, and the difficulty of cable operation is gradually increasing. The 10kV medium-voltage distribution network is the most common and widely used distribution network system. Due to the limitations of high-voltage cable manufacturing technology, the maximum length of jointless manufacturing is 10km. It is necessary to process the single cable joints and splice multiple cables together to achieve ultra-long-distance transmission.

[0003] At the cable joint, due to the two different insulating materials, the cable body insulation and the additional insulation, the electric field distribution is different from that of the cable body, which causes a certain potential difference between two adjacent points on the same layer of insulation, that is, the axial field strength, that is, the axial stress. The insulation near the conductor connection end is cut into a conical surface, that is, the reaction force cone, and then wrapped with additional insulation to form stress cone surfaces at both ends of the additional insulation. Changing the potential distribution on the insulation surface plays a role in uniform electric field and ensures the safety of the joint.

[0004] In order to reduce the electric field stress concentration at the cable joint, the requirements for the reaction force cone are relatively high: first, the best reaction force cone shape is a standard complex logarithmic surface, and second, the surface after cutting is required to be smooth. The quality of the reaction force cone formed by manual cutting with glass sheets varies, and it is time-consuming and labor-intensive, and difficult to standardize. Other auxiliary stripping devices on the market are cumbersome to operate, inefficient, low in intelligence, and the operating standards cannot be quantified. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a reaction force cone cutting device for the main insulation layer of a 10kV cable in a distribution network and a working method thereof.

[0006] The technical solution of the present invention is as follows:

[0007] A reaction force cone cutting device for the main insulation layer of a 10kV cable in a distribution network comprises a device shell, a cable fixing mechanism is fixedly installed at one end of the device shell, a tool feeding mechanism is arranged at the other end of the device shell, the tool feeding mechanism is rotatably installed with the inner wall of the device shell through a bearing, an electric drive mechanism is installed on the outer side of the device shell, and the electric drive mechanism is transmission-connected to the tool feeding mechanism through a transmission mechanism.

[0008] Wherein, a cable inlet and a cable outlet are respectively arranged at two ends of the device shell, and an auxiliary handle is arranged on the outer wall of the device shell.

[0009] Wherein, the cable fixing mechanism comprises a cable restraining sleeve which is detachably nested in the end face of the device housing, and the end face of the cable restraining sleeve is provided with a limiting flange structure.

[0010] Wherein, the transmission mechanism includes a driving wheel, a transmission belt and a driven wheel, the driving wheel and the driven wheel are connected by a transmission belt, the driving wheel is installed at the output end of the electric drive mechanism, and the inner ring of the driven wheel is rotatably installed with the inner wall of the device housing through the bearing.

[0011] The tool feeding mechanism comprises a flange chassis fixedly mounted on the side surface of the driven wheel, the flange chassis has a cable passage opening in the middle part, an external gear ring is rotatably mounted on the outer wall of the flange chassis, an external hexagonal adjustment column is rotatably mounted on the flange surface of the flange chassis, the external hexagonal adjustment column has a straight tooth column meshing with the gear ring for transmission, a partition is fixedly arranged in the middle part of the inner cavity of the device shell, the partition has a cable passage opening in the middle part, three groups of radial sliding grooves are arranged in an annular array around the partition, tool mounting frames are respectively slidably mounted in the radial sliding grooves, cutting tools are respectively mounted on the tool mounting frames, a plane threaded ridge is arranged on the end surface of the gear ring, a tooth arc ridge matching the plane threaded ridge is arranged on the bottom surface of the tool mounting frame, a rolling wheel is installed on the tool mounting frame close to the center of the device, and the rolling wheel abuts against the outer wall of the cable restraint sleeve.

[0012] The cutting tool comprises a tool handle fixedly mounted on the tool mounting frame and a blade body for contacting the main insulation layer of the cable to achieve cutting, and an angle of 30° is formed between the blade body and the direction in which the cable travels.

[0013] Among them, the parametric equation of the involute of the plane thread ridge is:

[0014]

[0015]

[0016] Where: is the rolling angle;

[0017] Where: a = S / 2π, S is the plane thread pitch of the plane thread ridge;

[0018] Determination of the maximum curvature radius of the outer arc and the minimum curvature radius of the inner arc of the plane thread ridge involute helix:

[0019] ρ max =R 外

[0020] Where: maxThe maximum radius of curvature of the involute spiral of the plane thread ridge;

[0021] R 外 is the outer radius of the plane thread ridge;

[0022] ρ min =R 内

[0023] Where: min It is the minimum radius of curvature of the inner arc of the involute spiral of the plane thread ridge;

[0024] R 内 is the inner radius of the plane thread ridge;

[0025] The radius of the large arc of the tooth arc ridge must satisfy the inequality:

[0026]

[0027] Where: R 大 is the radius of the large arc of the tooth arc ridge, ρ max It is the maximum radius of curvature of the involute spiral of the plane thread ridge.

[0028] The radius of the small arc of the tooth arc ridge must satisfy the inequality:

[0029]

[0030] Where: R 小 is the radius of the small arc of the tooth arc ridge, ρ min It is the minimum radius of curvature of the inner arc of the involute spiral of the plane thread ridge.

[0031] The ideal edge profile of the blade is a standard complex logarithmic curve, which is expressed as:

[0032]

[0033] Where U di is the design voltage (kV), E r is the core field strength at the terminal reinforced insulation (kV), r c is the shield radius of the cable conductor (mm), r j is the insulation radius of the winding (mm), x and y are the axial and radial coordinates of the curve.

[0034] A method for using a reaction force cone cutting device for a main insulation layer of a 10 kV cable in a distribution network, comprising the following steps:

[0035] 1) Fix the cable externally;

[0036] 2) Replace the cable restraint sleeve corresponding to the cable to be processed for the reaction cone cutting device;

[0037] 3) Use the corresponding tool to twist the exposed hexagonal adjustment column on the top of the device so that the limit bearing on the tool mounting bracket just supports the outer wall of the cable restraint sleeve;

[0038] 4) Insert the cable into the cable restraint sleeve so that it just touches the cutting tool;

[0039] 5) Start the electric drive mechanism to start rotating for cutting;

[0040] 6) The pushing device moves forward slowly to complete the cutting of the reaction force cone.

[0041] The present invention has the following beneficial effects:

[0042] 1. A reaction force cone cutting device for the main insulation layer of a 10kV cable in a distribution network of the present invention adopts a three-leaf forming knife design based on a standard complex logarithmic curve, which overcomes the problem of eccentric cutting caused by insufficient cable rigidity, while ensuring that the reaction force cone surface of the cutting is in the best shape, and can achieve the optimal curved surface forming shape and low surface roughness.

[0043] 2. The present invention adopts a replaceable external rotating positioning sleeve design for the main insulation layer reaction cone cutting device of the 10kV cable of the distribution network, which solves the concentric positioning problem during cable cutting. The universal installation interface design can adapt to 50-400mm 2 All cable specifications.

[0044] 3. The tool feeding mechanism of the reaction force cone cutting device for the main insulation layer of a 10kV cable in a distribution network of the present invention adopts a planar thread structure. Through manual control, the hexagonal adjustment column and the straight tooth column are manually rotated to drive the gear ring to rotate, thereby realizing the rotation of the planar thread ridge. The arc ridge and the planar thread ridge are meshed and transmitted, realizing synchronous stepless adjustment of multiple sets of cutting tools to adjust the front and rear feed of the tool mounting frame.

[0045] 4. The present invention is a handheld device for cutting the main insulation layer reaction force cone of a 10kV cable in a distribution network. The device is compact in design and light in weight, which can meet the needs of cable cutting in daily or sudden events. It is easy to carry and can be operated by hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The overall appearance of the present invention is shown in perspective. Figure 1 ;

[0047] Figure 2 The overall appearance of the present invention is shown in perspective. Figure 2 ;

[0048] Figure 3 It is a schematic diagram of the structure of the cable fixing mechanism of the present invention;

[0049] Figure 4 The schematic diagram of the tool feeding mechanism of the present invention is as follows: Figure 1 ;

[0050] Figure 5 The schematic diagram of the tool feeding mechanism of the present invention is as follows: Figure 2 ;

[0051] Figure 6 It is a partial cross-sectional structural schematic diagram of the tool feeding mechanism of the present invention;

[0052] Figure 7 It is a schematic diagram of the top view of the tool feeding mechanism of the present invention;

[0053] Figure 8 It is a schematic diagram of the transmission mechanism structure of the present invention;

[0054] Fig. 9 It is a schematic diagram of the structure of the cutting tool of the present invention;

[0055] Fig.10 This is a schematic diagram of the planar thread ridge structure of the present invention;

[0056] Fig.11 for Fig.10 AA-direction cross-sectional structure schematic diagram;

[0057] Fig.12 It is a schematic diagram of the stress cone shape of the present invention;

[0058] Fig.13 It is a schematic diagram of the minimum value curve of the stress cone length of the present invention. DETAILED DESCRIPTION

[0059] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] See also Figure 1-3 A distribution network 10kV cable main insulation layer reaction force cone cutting device includes a device housing 1, a cable fixing mechanism 2 is fixedly installed at one end of the device housing 1, a tool feeding mechanism 3 is arranged at the other end of the device housing 1, the tool feeding mechanism 3 is rotatably installed with the inner wall of the device housing 1 through a bearing 4, an electric drive mechanism 5 is installed on the outer side of the device housing 1, and the electric drive mechanism 5 is transmission-connected to the tool feeding mechanism 3 through a transmission mechanism 6.

[0061] Specifically, Figure 1-2 A cable inlet and a cable outlet are respectively provided at both ends of the device housing 1 for the cable to pass through, and an auxiliary handle 7 is provided on the outer wall of the device housing 1 for holding the device for convenient handheld operation.

[0062] Specifically, Figure 3The cable fixing mechanism 2 includes a cable restraining sleeve 21 which is detachably nested in the end face of the device housing 1. The end face of the cable restraining sleeve 21 has a limited flange structure. The inner hole of the cable restraining sleeve 21 is used to pass the cable. The cable restraining sleeve 21 has a variety of specifications. Different specifications are distinguished by different inner hole sizes. The inner hole size range includes 50-400mm 2 When the device is used to process cables of different sizes, it is sufficient to replace the cable restraint sleeve 21 with different specifications and sizes. The inner hole of the cable restraint sleeve 21 fits the outer wall of the cable. During the cutting process, the cable and the cable restraint sleeve 21 will not rotate relative to each other, and there is no friction. Compared with the previous design, the transmission part is in direct contact with the cable. During the cutting process, the two generate a lot of heat due to friction, which affects the cutting. The existing design adds a cable restraint sleeve 21 to avoid the problem of frictional heating, and the replacement is more flexible and convenient. The cable restraint sleeve 21 mainly limits the feed of the tool by the outer cylindrical part of the front end. When the tool is fed to fit the outer wall, it cannot move forward. This is the best position for cable cutting. The specific cable fixing mechanism 2 is described later.

[0063] Specifically, Figure 8 The transmission mechanism 6 includes a driving wheel 61, a transmission belt 62 and a driven wheel 63. The driving wheel 61 and the driven wheel 63 are connected through the transmission belt 62. The driving wheel 61 is installed at the output end of the electric driving mechanism 5. The inner ring of the driven wheel 63 is rotatably installed with the inner wall of the device housing 1 through the bearing 4. Among them, the electric driving mechanism 5 can be preferably a hand-held electric drill device with a handle structure, which can be used with an auxiliary handle 7 for hand-held operation.

[0064] Specifically, Figure 3-7The tool feeding mechanism 3 includes a flange chassis 31 fixedly mounted on the side of the driven wheel 63, a cable passing opening in the middle of the flange chassis 31, an outer gear ring 32 is rotatably mounted on the outer wall of the flange chassis 31, an outer hexagonal adjustment column 310 is rotatably mounted on the flange surface of the flange chassis 31, and the outer hexagonal adjustment column 310 has a straight tooth column 33 meshing with the gear ring 32 for transmission, a partition 11 is fixedly arranged in the middle of the inner cavity of the device housing 1, a cable passing opening in the middle of the partition 11, and three groups of radial slide grooves 34 are arranged in an annular array around the partition 11, and tool mounting frames 35 are respectively slidably mounted in the radial slide grooves 34, and cutting tools 36 are respectively mounted on the tool mounting frames 35, and the ends of the gear ring 32 are fixedly mounted on the outer surface of the flange chassis 31. A flat threaded ridge 37 is provided on the surface, and a tooth arc ridge 38 matching the flat threaded ridge 37 is provided on the bottom surface of the tool mounting bracket 35; when working, the outer end of the external hexagonal adjustment column 310 is manually rotated with a wrench to drive the spur column 33 to rotate, and the spur column 33 drives the external gear ring 32 to rotate, and then the meshing transmission between the flat threaded ridge 37 and the tooth arc ridge 38 is utilized to drive the three groups of tool mounting brackets 35 to move toward the radial center or outer edge, thereby realizing the advance and retreat feed adjustment of the cutting tool 36. A rolling wheel 39 is installed on the side of the tool mounting bracket 35 close to the center of the device, and the rolling wheel 39 abuts against the outer wall of the cable restraint sleeve 21 to play a limiting role, and at the same time utilizes rolling friction to reduce friction resistance and wear.

[0065] Furthermore, due to the different specifications of 10KV cables and different production processes of different manufacturers, the diameters of cables of different specifications are also different, so this device must be designed so that the tool can be adjusted forward and backward to meet the needs of cutting cables of different specifications.

[0066] The conditions that the plane thread ridge 37 curve should have are:

[0067] When the plane thread ridge 37 is rotated to any angle, the displacement of the three tool holders in the spiral I-shaped groove along the radial direction should be equal (the plane thread ridge 37 curve is required to be isoprogressive);

[0068] When the plane thread ridge 37 rotates one circle, the displacement of the three tool holders in the spiral I-shaped groove along the radial direction should be exactly equal to the pitch of the plane thread ridge 37 curve (helix). The tooth arc ridge 38 is evenly distributed, which can not only keep meshing with the plane thread ridge 37 at any position, but also ensure that the tooth arcs on the claws located at the plane thread ridge 37 can be fully meshed with the plane thread of the plane thread ridge 37 at the same time, so the pitch of the plane thread of the plane thread ridge 37 must keep the same value (the equidistance of the plane thread ridge 37 curve is required);

[0069] By referring to relevant data, set the plane thread pitch S = 6, such as Figure 10-11 As shown;

[0070] Determination of the involute base circle radius of the plane thread ridge 37:

[0071] a=S / 2π

[0072] Where: a is the radius of the involute base circle (mm);

[0073] Parameter equation of involute of plane thread ridge 37:

[0074]

[0075]

[0076] Where: is the rolling angle;

[0077] Determination of the maximum curvature radius of the outer arc and the minimum curvature radius of the inner arc of the involute helix of the plane thread ridge 37:

[0078] ρ max =R 外

[0079] Where: max is the maximum radius of curvature of the involute spiral of the planar thread ridge 37 (mm);

[0080] R 外 is the outer radius of the plane thread ridge 37 (mm);

[0081] ρ min =R 内

[0082] Where: min is the minimum radius of curvature of the involute spiral inner arc of the plane thread ridge 37 (mm);

[0083] R 内 is the inner hole radius of the flat thread ridge 37 (mm);

[0084] Determination of all large and small arc radii of tooth arc ridge 38:

[0085] In order to prevent the bad contact and wedging between the arc ridge 38 and the inner and outer arc edges of the involute spiral of the plane thread ridge 37, the large and small arc radii of the arc ridge 38 are selected as follows;

[0086] The radius of the large arc of the tooth arc ridge 38 must satisfy the inequality:

[0087]

[0088] Where: R 大 is the radius of the major arc of the tooth arc ridge 38 (mm);

[0089] The radius of the small arc of the tooth arc ridge 38 must satisfy the inequality:

[0090]

[0091] Where: R 小 is the radius of all small arcs of the tooth arc ridge 38 (mm);

[0092] Considering many factors such as processing technology and transmission accuracy, the radius of all large and small arcs of the tooth arc ridge 38 is finally determined as:

[0093]

[0094]

[0095] It is calculated that the radius of the large arc is 48mm and the radius of the small arc is 25mm.

[0096] Furthermore, the ideal edge profile of the blade (362) is a standard complex logarithmic curve, which is expressed as:

[0097]

[0098] Where U di is the design voltage (kV), E r is the core field strength at the terminal reinforced insulation (kV), r c is the shield radius of the cable conductor (mm), r j is the insulation radius of the added winding (mm), x and y are the axial and radial coordinates of the curve;

[0099] The cutting tool (36) comprises a tool handle (361) fixedly mounted on the tool mounting frame (35) and a blade body (362) for contacting the main insulation layer of the cable to achieve cutting, and the blade body (362) forms an angle of 30° with the direction in which the cable travels.

[0100] Specifically, there is a stress concentration problem at the cut-off point of the cable middle joint. We know that when the same section of the cable is composed of different insulating materials, the distribution of the electric field strength is related to the dielectric constant s of the insulating material. Therefore, near the joint tube, due to the two different insulating materials of the cable body insulation and the additional insulation, the electric field distribution is different from that of the cable body, which causes a certain potential difference between two adjacent points on the same layer of insulation, that is, the axial field strength, that is, the axial stress. In order to improve the electric field distribution of this part, the cable body insulation needs to be cut into the shape of a "pencil head", which has a similar function to the stress cone and also plays the role of a uniform electric field. This cone curve like a "pencil head" is exactly in the opposite direction of the stress cone curve, so it is called the "reaction force cone".

[0101] When making heat shrinkable intermediate joints, the end of the insulation must be cut into a cone, that is, a reaction force cone, and the cone surface must be polished with a sanding belt, which is also a stress control measure. Because the length of the cone surface is much longer than the length of the right-angle side of the insulation end, the tangential field strength along the cone surface is much smaller than the tangential field strength of the right-angle side of the insulation, and the possibility of breakdown along the cone surface is greatly reduced, thereby improving the performance of the joint.

[0102] In order to design a tool that conforms to the complex logarithmic curve surface, the design principle of the stress cone curve must be understood.

[0103] Stress cone principle: epoxy reinforced structure;

[0104] The thickness of the terminal winding insulation is generally determined by the field strength at the core being 45%-46% of the field strength at the core of the cable body.

[0105] The field strength at the core is:

[0106]

[0107] Where U di is the design voltage (kV); E r The core field strength at the terminal reinforced insulation (kV); c is the shielding radius of the cable conductor (mm); r j is the insulation radius of the additional winding (mm);

[0108] From the above formula we can get:

[0109]

[0110] The thickness of the additional winding insulation is:

[0111]

[0112] Where r i is the cable insulation radius;

[0113] The transition section (stress cone) where the end of the metal sheath transitions from the outer diameter of the cable insulation to the outer diameter of the added insulation, if not handled properly, is prone to excessive axial field strength and breakdown. Therefore, its shape and length are designed based on the axial field strength on its surface being equal to or less than its maximum allowable axial field strength. Under the condition that the dielectric constant of the added insulation is the same as that of the cable insulation, that is, the added insulation is not divided into grades, the equation for the equal axial field strength at each point of the stress cone is:

[0114]

[0115] The ideal minimum length of the stress cone is

[0116]

[0117] Where x, y—axial and radial coordinates of the stress cone

[0118] E t —Axial design field strength, for oil-filled cables and steel pipe oil-filled cables; generally, the oil-paper is 1.0-2.0kV / mm, and its value depends on the structure, installation process, and the technical level of the construction personnel. In the case of high radial field strength, the joint is made by manual wrapping on site, and the technical level of the construction personnel is not high, the axial field strength is usually lower; otherwise, it can be higher.

[0119] like Fig.12 As shown, in fact, except for the theoretical stress cone of this logarithmic curve formed by the machine tool, for the convenience of construction, the ideal curve is generally replaced by a broken line during on-site construction. At that time, the axial field strength at each point on each straight line is not a constant, but decreases as Y increases. The stress cone obtained by replacing the ideal curve AB with a straight line is too long, and it is generally replaced by two or more straight lines. Figure 3-7 The maximum field strength can only be at points A and C. Let the axial field strength at points A and C be equal to the allowable axial design field strength E. At this time, the stress cone length L′ k Should be:

[0120]

[0121] Where r y ——The radius of point C

[0122] To obtain L' k Minimum value, the formula for r y Differentiate and let dL′ k / dy=0. For the convenience of calculation, a series of curves are drawn, as shown in the figure. From the figure, the best one can be found according to the relevant data to meet the above differential conditions, so that the total length of the stress cone composed of the two discounts is the minimum.

[0123] L k The minimum value curve is as follows Fig.13 shown in Fig.13 middle:

[0124]

[0125]

[0126]

[0127] Where Δ n =r f -r

[0128] In Application Figure 3-8When the above formula is used, N1 and N2 should be obtained, and then the corresponding K value should be found from the figure, and then the best r should be obtained according to the above formula. y In general, N1 = 1.25 ~ 2.5, L k Length should be L k 120% to 150% of.

[0129] According to the above design method, the corresponding values ​​are substituted to obtain the corresponding complex logarithmic curve. By substituting the curve function into the corresponding three-dimensional modeling software, the schematic diagram of the cutting tool (36) is obtained as shown in FIG. Fig. 9 As shown;

[0130] Considering that the cutting material is cross-linked polyethylene, which has good machinability, low hardness, and certain elasticity, the tool material we choose this time needs to have a certain hardness and good enough toughness, so the tool material selected this time is 65Mn.

[0131] like Fig. 9 As shown, the cutting angle of the tool is designed to be 30° this time, which is determined by comprehensively considering the material characteristics and mechanical properties of cross-linked polyethylene.

[0132] Based on the above device embodiment, the present invention provides a method for using a reaction force cone cutting device for the main insulation layer of a 10kV cable in a distribution network, comprising the following steps:

[0133] 1) Fix the cable externally;

[0134] 2) Replace the cable restraint sleeve corresponding to the cable to be processed for the reaction cone cutting device;

[0135] 3) Use the corresponding tool to twist the exposed hexagonal adjustment column on the top of the device so that the limit bearing on the tool mounting bracket just supports the outer wall of the cable restraint sleeve;

[0136] 4) Insert the cable into the cable restraint sleeve so that it just touches the cutting tool;

[0137] 5) Start the electric drive mechanism to start rotating for cutting;

[0138] 6) The pushing device moves forward slowly to complete the cutting of the reaction force cone.

[0139] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A reaction force cone cutting device for the main insulation layer of a 10kV cable in a distribution network, characterized in that: The device comprises a device housing (1), a cable fixing mechanism (2) being fixedly installed at one end of the device housing (1), a tool feeding mechanism (3) being arranged at the other end of the device housing (1), the tool feeding mechanism (3) being rotatably installed with the inner wall of the device housing (1) via a bearing (4), an electric driving mechanism (5) being installed on the outer side of the device housing (1), and the electric driving mechanism (5) being transmission-connected with the tool feeding mechanism (3) via a transmission mechanism (6); The cable fixing mechanism (2) comprises a cable restraining sleeve (21) which is detachably nested in the end surface of the device housing (1), and the end surface of the cable restraining sleeve (21) is provided with a limiting flange structure; The transmission mechanism (6) comprises a driving wheel (61), a transmission belt (62) and a driven wheel (63); the driving wheel (61) and the driven wheel (63) are connected to each other by the transmission belt (62); the driving wheel (61) is mounted on the output end of the electric driving mechanism (5); and the inner ring of the driven wheel (63) is rotatably mounted on the inner wall of the device housing (1) via the bearing (4); The tool feeding mechanism (3) comprises a flange chassis (31) fixedly mounted on the side of the driven wheel (63), the flange chassis (31) having a cable passage opening in the middle, an external gear ring (32) rotatably mounted on the outer wall of the flange chassis (31), an external hexagonal adjustment column (310) rotatably mounted on the flange surface of the flange chassis (31), the external hexagonal adjustment column (310) having a straight tooth column (33) meshing with the gear ring (32) for transmission, a partition (11) fixedly arranged in the middle of the inner cavity of the device housing (1), the partition (11) having a cable passage opening in the middle, the partition Three groups of radial grooves (34) are arranged in an annular array around the plate (11), and tool mounting frames (35) are slidably mounted in the radial grooves (34), and cutting tools (36) are mounted on the tool mounting frames (35). A plane thread ridge (37) is arranged on the end surface of the gear ring (32), and a tooth arc ridge (38) matching the plane thread ridge (37) is arranged on the bottom surface of the tool mounting frame (35). A rolling wheel (39) is installed on one side of the tool mounting frame (35) close to the center of the device, and the rolling wheel (39) abuts against the outer wall of the cable restraining sleeve (21); The cutting tool (36) comprises a tool handle (361) fixedly mounted on the tool mounting frame (35) and a blade body (362) for contacting the main insulation layer of the cable to achieve cutting, and the blade body (362) forms an angle of 30° with the direction in which the cable travels; The involute parameter equation of the plane thread ridge (37): Where: is the rolling angle; Wherein: a=S / 2π, S is the plane thread pitch of the plane thread ridge (37); Determination of the maximum curvature radius of the outer arc and the minimum curvature radius of the inner arc of the involute helix of the plane thread ridge (37): r max =R 外 Where: max The maximum radius of curvature of the involute spiral of the plane thread ridge (37); R 外 is the outer radius of the plane thread ridge (37); r min =R 内 Where: min is the minimum radius of curvature of the involute spiral inner arc of the plane thread ridge (37); R 内 is the inner hole radius of the plane thread ridge (37); The large arc radius of the tooth arc ridge (38) must satisfy the inequality: Where: R 大 is the radius of the major arc of the tooth arc ridge (38), ρ max The maximum radius of curvature of the involute spiral of the plane thread ridge (37); The small arc radius of the tooth arc ridge (38) must satisfy the inequality: Where: R 小 is the radius of the small arc of the tooth arc ridge (38), ρ min is the minimum radius of curvature of the involute spiral inner arc of the plane thread ridge (37); The ideal edge profile of the blade (362) is a standard complex logarithmic curve, which is expressed as: Where U di is the design voltage kV, E r The core field strength at the terminal reinforced insulation kV, r c is the shield radius of the cable conductor, mm, r j is the insulation radius of the winding (mm), and x and y are the axial and radial coordinates of the curve.

2. A 10kV cable main insulation layer reaction force cone cutting device for distribution network as claimed in claim 1, characterized in that: A cable inlet and a cable outlet are respectively provided at two ends of the device housing (1), and an auxiliary handle (7) is provided on the outer wall of the device housing (1).

3. A method for using the reaction force cone cutting device for the main insulation layer of a 10kV cable in a distribution network as described in any one of claims 1 to 2, characterized in that: The following steps are involved: 1) Fix the cable externally; 2) Replace the cable restraint sleeve corresponding to the cable to be processed for the reaction cone cutting device; 3) Use the corresponding tool to twist the exposed hexagonal adjustment column on the top of the device so that the limit bearing on the tool mounting bracket just supports the outer wall of the cable restraint sleeve; 4) Insert the cable into the cable restraint sleeve so that it just touches the cutting tool; 5) Start the electric drive mechanism to start rotating for cutting; 6) Push the device forward to complete the cutting of the reaction force cone.

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