A mold for manufacturing lightning protection cable

Abstract

The present invention belongs to the field of electric power technology, and relates to a mold for manufacturing lightning protection cables, which is composed of a mold core and a mold sleeve, and is characterized in that: the mold sleeve is a special structure, and is composed of a molding component, and the molding component is composed of a lead-out component and a flow-blocking rod connected in sequence; in the assembled state, the mold sleeve body of the mold sleeve is fixed on the outlet end wall of the sheath extruder head, the first part of the mold core is fixed on the inlet end wall of the sheath extruder head, the cone column hole part of the left part of the mold sleeve hole is located outside the second part of the mold core, the right side surface of the third part of the mold core does not extend out of the right side surface of the right part of the mold sleeve hole, the axis of the mold sleeve coincides with the axis of the mold core, and there is a gap between the outer wall of the third part of the mold core and the mold sleeve hole. The present invention has the following main beneficial effects: the mold structure is simple, easy to manufacture, easy to master the production method, low cost, high production efficiency, and high finished product qualification rate.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and in particular relates to a mould for manufacturing a lightning protection cable. Background Art

[0002] With the rapid development of distribution networks, the power supply area is covered by trees, and the influence of severe corrosion, strong winds and many other factors are causing new difficulties for the reliability of distribution networks. In the face of the threat posed by nature to distribution networks, overhead insulated conductors have emerged. Compared with ordinary overhead bare conductors, overhead insulated conductors have many advantages and can solve some problems encountered by conventional bare conductors during operation. They are much cheaper than buried cables, so they have been widely used in distribution networks. Overhead insulated conductors have the following advantages over bare conductors: (1) Good insulation performance. Overhead insulated conductors have an extra insulation layer, so their insulation performance is superior to that of bare conductors. They can reduce the distance between line phases, reduce the insulation requirements for line support parts, and increase the number of loops of lines installed on the same pole; (2) Good anti-corrosion performance. Overhead insulated conductors have an insulation layer on the outer layer, so they are less susceptible to oxidation corrosion than bare conductors, have strong anti-corrosion ability, and can extend the service life of the line; (3) Good performance in preventing external force damage, reducing the influence of external factors such as trees, flying objects, metal films and dust, and reducing phase-to-phase short circuits and grounding accidents. Although the insulated wire lacks a steel core, its toughness enables the mechanical strength of the entire wire to meet the stress and strain requirements.

[0003] When the induction lightning or direct lightning overvoltage with a high enough amplitude acts, the lightning wave propagates rapidly to both sides of the tower. When it reaches the weak point near the insulator, it discharges to the cross arm of the tower to form a lightning flashover and breaks through the insulation layer of the conductor. The broken insulation layer is pinhole-shaped. When the overvoltage causes two-phase or three-phase flashover at the same time, it is possible to form a power frequency continuous current on the channel of the lightning flashover, generating a power frequency short-circuit arc of up to thousands of amperes. The power frequency short-circuit arc is blocked by the surrounding insulation layer, and the arc root cannot slide along the insulated wire. It can only form a pinhole concentrated discharge at the lightning flashover and burn at the insulation breakdown point. Since the insulation of the 10kV line is relatively weak, lightning often causes two-phase or three-phase conductors to flash over to the ground. Under the action of electromagnetic force and thermal stress, the arc belly of the relative ground arc drifts to the air above the load side, and the intersection of the two-phase arcs is easy to develop into an interphase arc. The temperature of the arc root is very high, and it burns at one point, burning the insulated wire neatly in a very short time before the circuit breaker trips. Especially at the insulation damage of the terminal pole and the tension pole conductor, the power frequency continuous current is easy to form an arc to form a phase-to-phase metallic short circuit, which eventually causes the insulated wire to break. Compared with the bare wire struck by lightning: the lightning induced overvoltage that causes the insulator flashover of the bare wire is lower, and it is easier to form multi-phase flashover of the line; but the power frequency short circuit arc formed by the arc can slide along the surface of the wire away from the power source under the action of external forces such as electric power and air flow, and will not burn at a certain point, and will cause the circuit breaker to operate before the power frequency continuous current burns the wire or damages the insulator, cutting off the power frequency arc, and will not seriously burn the wire. The insulated wire is different. Because there is an insulating layer around the breakdown point, the movement of the arc is hindered, so that the arc root stays at one point and burns. At this time, even if the relay tripping time is adjusted to the minimum, the wire will be damaged by the power frequency short circuit current, and the occurrence of line breakage accidents is still difficult to avoid. Therefore, the failure rate of bare wire breakage is significantly lower than that of overhead insulated cables. Lightning strikes on overhead insulated cables can also cause tripping, resulting in power outages and reduced power supply, which can lead to reduced revenues, and such losses are often irreversible.

[0004] CN208819631U discloses a double-shielded lightning protection cable, including an outer sheath layer, an outer metal shielding film layer is provided on the inner surface of the outer sheath layer, an inner metal shielding film layer is provided inside the outer metal shielding film layer; an insulating support filling layer is provided between the outer metal shielding film layer and the inner metal shielding film layer; a conducting metal wire is buried in the insulating support filling layer; the inner side of the inner metal shielding film layer is filled with an inner filling layer, and a grounding wire is provided in the inner filling layer. The outer metal shielding film layer and the inner metal shielding film layer constitute a complete double-shielded structure, which can increase the difficulty of lightning striking the cable; the insulating support filling layer serves as an insulating isolation between the outer metal shielding film layer and the inner metal shielding film layer, thereby making it more difficult for lightning to strike; the conducting metal wire can conduct the breakdown current generated during the lightning strike; the grounding wire can conduct the breakdown current generated during the lightning strike to the ground, thus making the overall lightning protection effect more outstanding.

[0005] CN208298582U discloses a medium-voltage lightning protection and current diversion pre-branch cable for wind power generation equipment, which is laid on the fan blades of the wind power generation equipment. The pre-branch cable includes a trunk cable, a branch cable, and a branch connector arranged at the branch of the two and wrapped on the outside of the branch. The trunk cable and the branch cable both include a conductor, a 35kV-level inner shielding layer extruded on the outside of the conductor, and an insulating layer of 35kV and below extruded on the outside of the inner shielding layer. It can prevent the fan blades from being ablated by lightning pulse voltage.

[0006] After repeated verification, the applicant commissioned the Electrical Laboratory of Wuhan University to conduct many experiments to verify its feasibility in preventing 10kV power lines from being broken by lightning. The conclusion given was that the structure disclosed in the above-mentioned literature could not effectively prevent 10kV power lines from being broken by lightning.

[0007] There is no corresponding cable or mold for manufacturing the corresponding cable in the prior art. Summary of the invention

[0008] In order to solve the above problems, the purpose of the present invention is to disclose a mold for manufacturing lightning protection cables, which is achieved by adopting the following technical solutions.

[0009] A mold for manufacturing lightning protection cables, consisting of a mold core and a mold sleeve, the mold core consisting of a first core part, a second core part, and a third core part connected in sequence, the first core part and the third core part are both cylindrical, the second core part is a truncated cone shape, the first core part, the second core part, and the third core part have connected core holes inside, and the core hole passes through along the axial direction of the mold core; it is characterized in that: the mold sleeve consists of a mold sleeve body, a mold sleeve connector, and two groups of molding components, the mold sleeve body has a mold sleeve hole passing through along the axial direction of the mold sleeve, the left side of the mold sleeve hole is in the shape of a truncated cone and gradually becomes smaller from the left side of the mold sleeve body to the right side of the mold sleeve body, the right side of the mold sleeve hole is in the shape of a cylinder and the diameter of the cylinder is smaller than the smallest diameter of the truncated cone of the left side of the mold sleeve hole, the left side of the mold sleeve hole and the axis of the right side of the mold sleeve hole The mold sleeve connector is in the shape of an annular cylinder and extends outward from the right surface of the mold sleeve body. The inner diameter of the mold sleeve connector is larger than the diameter of the cylinder on the right side of the mold sleeve hole and the axes of the two coincide. The molding component is located in the cylindrical hole on the right side of the mold sleeve hole and extends from the wall of the cylindrical hole in the axial direction. The molding component is composed of a lead-out component and a flow-blocking rod connected in sequence. One end of the lead-out component is connected to the hole wall of the cylindrical hole on the right side of the mold sleeve hole, and the other end of the lead-out component is connected to the outer edge of the flow-blocking rod. The flow-blocking rod is in the shape of a cylinder. The length of the flow-blocking rod is not less than the length of the right side of the mold sleeve hole. The left surface of the flow-blocking rod and the left surface of the right side of the mold sleeve hole are in the same plane. The length of the lead-out component is less than the length of the right side of the mold sleeve hole. The right side surface of the lead-out component is to the left of the right side surface of the right side of the mold sleeve hole. The two groups of molding components are symmetrically distributed in the mold sleeve hole.

[0010] When in the assembled state, the mold sleeve body of the mold sleeve is fixed on the outlet end wall of the sheath extruder head, the first part of the mold core is fixed on the inlet end wall of the sheath extruder head, the conical column hole part of the left part of the mold sleeve hole is located outside the second part of the mold core, the right side surface of the third part of the mold core does not extend out of the right side surface of the right side part of the mold sleeve hole, the axis of the mold sleeve coincides with the axis of the mold core, and there is a gap between the outer wall of the third part of the mold core and the mold sleeve hole.

[0011] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the molding parts can be multiple.

[0012] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold core is an integrated structure.

[0013] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold sleeve is an integrated structure.

[0014] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the materials of the mold core and the mold sleeve can be steel, iron, copper or alloy.

[0015] A mold for manufacturing lightning protection cables, comprising a mold core and a mold sleeve, wherein the mold core is composed of a first mold core part, a second mold core part, and a third mold core part which are connected in sequence, wherein the first mold core part and the third mold core part are both cylindrical, and the second mold core part is a truncated cone column. The first mold core part, the second mold core part, and the third mold core part have connected mold core holes inside, and the mold core holes penetrate along the axis direction of the mold core; the characteristic is that: the mold for manufacturing lightning protection cables also comprises a rotating mold, a driving device, and a transmission component;

[0016] The mold sleeve is composed of a mold sleeve body and a mold sleeve connector. The mold sleeve body has a mold sleeve hole that penetrates along the axial direction of the mold sleeve. The left side of the mold sleeve hole is in the shape of a truncated cone and gradually becomes smaller from the left side of the mold sleeve body to the right side of the mold sleeve body. The right side of the mold sleeve hole is in the shape of a cylinder and the diameter of the cylinder is smaller than the diameter of the smallest part of the truncated cone of the left side of the mold sleeve hole. The axis of the left side of the mold sleeve hole coincides with the axis of the right side of the mold sleeve hole. The mold sleeve connector is in the shape of a circular cylinder and extends outward from the right surface of the mold sleeve body. The inner diameter of the mold sleeve connector is larger than the diameter of the cylinder of the right side of the mold sleeve hole and the axes of the two coincide. A mold sleeve diversion hole connected to the mold sleeve hole is provided above the right side of the mold sleeve hole.

[0017] The rotary mold is composed of a rotary component, a rotary mold fixing head, a rotary mold guide sleeve, and a drainage component. The rotary mold fixing head is located on the left side of the rotary component, the rotary mold guide sleeve is located on the right side of the rotary mold fixing head, the rotary mold guide sleeve is an extension of the rotary mold fixing head, the rotary component is sleeved and fixed on the rotary mold fixing head and can rotate around the rotary mold fixing head, the outer surface of the rotary component is provided with a concave transmission groove, the rotary component is also provided with a plastic spraying hole that passes through left and right, the left side wall of the rotary component is provided with an annular concave plastic storage channel, the plastic storage channel is provided with a drainage component that extends to the left and communicates with the plastic storage channel, the plastic storage channel is connected to the plastic spraying hole, and the axial direction of the rotary mold is provided with a rotary mold hole that passes through left and right;

[0018] The driving device has a driving component, and the transmission component is sleeved on the driving component and the transmission groove;

[0019] When in the assembled state, the mold sleeve body of the mold sleeve is fixed on the outlet end wall of the sheath extruder head, the first part of the mold core is fixed on the inlet end wall of the sheath extruder head, the conical column hole part of the left part of the mold sleeve hole is located outside the second part of the mold core, the right side surface of the third part of the mold core is tightly attached to the left side surface of the right side part of the mold sleeve hole, the axis of the mold sleeve coincides with the axis of the mold core, and there is a gap between the outer wall of the third part of the mold core and the mold sleeve hole; the drainage component is connected to the diversion hole of the mold sleeve, the rotating mold fixing head is fixed on the mold sleeve and is located on the right side of the mold sleeve, and the rotating mold hole is connected to the mold sleeve hole.

[0020] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the number of the injection molding holes can be multiple and they are distributed symmetrically or asymmetrically.

[0021] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold core is an integrated structure.

[0022] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold sleeve is an integrated structure.

[0023] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the rotating mold is an integrated structure.

[0024] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the materials of the mold core, mold sleeve, and rotating mold can all be steel, iron, copper, or alloy.

[0025] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the driving device can be a motor and the driving component is a motor shaft.

[0026] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the transmission component is a belt or a chain.

[0027] The above-mentioned mold for manufacturing lightning protection cables is characterized in that it can also be gear-driven.

[0028] The present invention has the following main beneficial effects: the mold structure is simple, easy to manufacture, easy to master the production method, low cost, high production efficiency and high finished product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the mold core used in this application.

[0030] Figure 2 for Figure 1 Enlarged main view after cutting off half.

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the mold sleeve used in Example 1.

[0032] Figure 4 for Figure 3 Enlarged main view after cutting off half.

[0033] Figure 5 for Figure 3 Enlarged right side view.

[0034] Figure 6 for Figure 1 , Figure 3 The enlarged front view after assembly and then cutting it in half.

[0035] Figure 7 The front view of the lightning protection cable manufactured for implementation example 1.

[0036] Figure 8 Schematic diagram of the three-dimensional structure of the rotational mold used in Example 2.

[0037] Fig. 9 It is a three-dimensional exploded schematic diagram of the assembly of the rotary mold in Example 2.

[0038] Fig.10 for Figure 1 , improved Figure 3 and Figure 8 The enlarged front view after assembly and cutting it in half.

[0039] Fig.11 This is a schematic diagram of the three-dimensional structure of a section of the lightning protection cable manufactured in Example 2.

[0040] In order to enable personnel in the technical field to more accurately and clearly understand and implement the present application, the following is a further explanation of the figure numbers in conjunction with the drawings of the specification, in which: 1-core, 11-first part of the core, 12-second part of the core, 13-third part of the core, 14-core hole, 2-mold sleeve, 21-mold sleeve body, 22-mold sleeve connector, 23-molding component, 24-mold sleeve hole, 25-mold sleeve diverter hole, 231-lead-out component, 232-blocking rod, 81-conductor, 82-insulating layer, 811-groove, 3-rotating mold, 31-rotating component, 32-transmission groove, 33-rotating mold fixing head, 34-rotating mold hole, 35-rotating mold guide sleeve, 36-injection hole, 37-plastic storage channel, 38-diversion component, 821-spiral groove, 4-driving device, 41-driving component, 5-transmission component. DETAILED DESCRIPTION

[0041] Implementation Example 1: Please see Figures 1 to 7A mold for manufacturing lightning protection cables, consisting of a mold core 1 and a mold sleeve 2. The mold core 1 consists of a first core part 11, a second core part 12, and a third core part 13 connected in sequence. The first core part 11 and the third core part 13 are both cylindrical, and the second core part 12 is a truncated cone. The first core part 11, the second core part 12, and the third core part 13 have a connected core hole 14 inside, and the core hole 14 passes through along the axis direction of the core 1; it is characterized in that The mold sleeve 2 is composed of a mold sleeve body 21, a mold sleeve connector 22, and two sets of molding components 23. The mold sleeve body 21 has a mold sleeve hole 24 that penetrates along the axial direction of the mold sleeve 2. The left side of the mold sleeve hole 24 is in the shape of a truncated cone and gradually becomes smaller from the left side of the mold sleeve body to the right side of the mold sleeve body. The right side of the mold sleeve hole 24 is in the shape of a cylinder and the diameter of the cylinder is smaller than the smallest diameter of the truncated cone of the left side of the mold sleeve hole 24. The axis of the left side of the mold sleeve hole 24 coincides with the axis of the right side of the mold sleeve hole 24. The mold sleeve connector 22 is in the shape of a circular cylinder and extends outward from the right surface of the mold sleeve body 21. The inner diameter of the mold sleeve connector 22 is larger than the diameter of the cylinder on the right side of the mold sleeve hole 24 and the axes of the two coincide. The molding component 23 is located in the cylindrical hole on the right side of the mold sleeve hole 24 and extends from the wall of the cylindrical hole in the axial direction. The molding component 23 is composed of a lead-out component 231 and a flow blocking rod 232 connected in sequence. One end of the lead-out component 231 is connected to the hole wall of the cylindrical hole on the right side of the mold sleeve hole 24. The other end of the lead-out component 231 is connected to the outer edge of the blocking rod 232, the blocking rod 232 is cylindrical, the length of the blocking rod 232 is not less than the length of the right part of the mold sleeve hole 24, the left surface of the blocking rod 232 and the left surface of the right part of the mold sleeve hole 24 are in the same plane, the length of the lead-out component 231 is less than the length of the right part of the mold sleeve hole 24, the right side surface of the lead-out component 231 is to the left of the right side surface of the right part of the mold sleeve hole 24, and the two groups of molding components 23 are symmetrically distributed in the mold sleeve hole 24;

[0042] When in the assembled state, the mold sleeve body 21 of the mold sleeve 2 is fixed on the outlet end wall of the sheath extruder head, the first core part 11 of the mold core 1 is fixed on the inlet end wall of the sheath extruder head, the conical column hole part of the left part of the mold sleeve hole 24 is located outside the second core part 12, the right side surface of the third part 13 of the mold core does not extend out of the right side surface of the right part of the mold sleeve hole 24, the axis of the mold sleeve 2 coincides with the axis of the mold core 1, and there is a gap between the outer wall of the third part 13 of the mold core and the mold sleeve hole 24.

[0043] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the molding parts can be multiple.

[0044] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold core is an integrated structure.

[0045] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold sleeve is an integrated structure.

[0046] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the materials of the mold core and the mold sleeve can be steel, iron, copper or alloy.

[0047] The mold for manufacturing lightning protection cables described above is used to produce lightning protection cables. First, the mold is installed as described above, and the conductor 81 passes through the mold core hole and the mold sleeve hole and is pulled forward. When passing through the mold sleeve hole, it is important to make a part of the blocking rod 232 embedded in the groove 811 on the outer edge of the conductor, and make the wall of the blocking rod 232 fit with the wall of the groove 811. Since the groove 811 is a part of the cylindrical hole and matches the diameter of the blocking rod 232, it can be easily fitted. The molten insulating layer material is squeezed from the extruder cavity to the extruder head and then enters Figure 6 The channel shown by the arrow is then extruded outside the conductor. Due to the diameter and length of the blocking rod 232, the plastic will not be squeezed into the groove 811. The length of the lead-out component 231 allows the plastic to still form a complete insulating layer 82 when passing through the mold sleeve hole 24. The molten insulating layer material is rapidly cooled after leaving the mold sleeve hole, so the groove 811 will not be stained with insulating layer material, completing the manufacture of the lightning protection cable.

[0048] Implementation Example 2: Please see Figure 8 and Fig.11 , and refer to Figures 1 to 6 A mold for manufacturing lightning protection cables, comprising a mold core 1 and a mold sleeve 2. The mold core 1 is composed of a first mold core part 11, a second mold core part 12, and a third mold core part 13 which are connected in sequence. The first mold core part 11 and the third mold core part 13 are both cylindrical in shape, and the second mold core part 12 is in the shape of a truncated cone. The first mold core part 11, the second mold core part 12, and the third mold core part 13 have a connected mold core hole 14 inside, and the mold core hole 14 penetrates along the axial direction of the mold core 1; it is characterized in that: the mold for manufacturing lightning protection cables also has a rotating mold 3, a driving device 4, and a transmission component 5;

[0049] The mold sleeve 2 is composed of a mold sleeve body 21 and a mold sleeve connector 22. The mold sleeve body 21 has a mold sleeve hole 24 that penetrates along the axial direction of the mold sleeve 2. The left side of the mold sleeve hole 24 is in the shape of a truncated cone and gradually becomes smaller from the left side of the mold sleeve body to the right side of the mold sleeve body. The right side of the mold sleeve hole 24 is in the shape of a cylinder and the diameter of the cylinder is smaller than the diameter of the smallest part of the truncated cone of the left side of the mold sleeve hole 24. The axis of the left side of the mold sleeve hole 24 coincides with the axis of the right side of the mold sleeve hole 24. The mold sleeve connector 22 is in the shape of a circular cylinder and extends outward from the right surface of the mold sleeve body 21. The inner diameter of the mold sleeve connector 22 is larger than the diameter of the cylinder of the right side of the mold sleeve hole 24 and the axes of the two coincide. The upper side of the right side of the mold sleeve hole 24 has a mold sleeve diversion hole 25 that is connected to the mold sleeve hole 24.

[0050] The rotary mold 3 is composed of a rotary component 31, a rotary mold fixing head 33, a rotary mold guide sleeve 35, and a drainage component 38. The rotary mold fixing head 33 is located on the left side of the rotary component 31, and the rotary mold guide sleeve 35 is located on the right side of the rotary mold fixing head 33. The rotary mold guide sleeve 35 is an extension of the rotary mold fixing head 33. The rotary component 31 is sleeved and fixed on the rotary mold fixing head 33 and can rotate around the rotary mold fixing head 33. The outer surface of the rotary component 31 has a concave transmission groove 32, and the rotary component 31 also has a plastic injection hole 36 that penetrates from left to right. The left side wall of the rotary component 31 has an annular concave plastic storage channel 37, and the plastic storage channel 37 has a drainage component 38 extending to the left and communicating with the plastic storage channel 37. The plastic storage channel 37 is connected to the plastic injection hole 36, and the axial direction of the rotary mold 3 has a rotary mold hole 34 that penetrates from left to right.

[0051] The driving device 4 has a driving component 41, and the transmission component 5 is sleeved on the driving component 41 and the transmission slot 32;

[0052] When in the assembled state, the mold sleeve body 21 of the mold sleeve 2 is fixed on the outlet end wall of the sheath extruder head, the mold core first part 11 of the mold core 1 is fixed on the inlet end wall of the sheath extruder head, the cone column hole part of the left part of the mold sleeve hole 24 is located outside the second part 12 of the mold core, the right side surface of the third part 13 of the mold core is tightly attached to the left side surface of the right part of the mold sleeve hole 24, the axis of the mold sleeve 2 coincides with the axis of the mold core 1, and there is a gap between the outer wall of the third part 13 of the mold core and the mold sleeve hole 24; the drainage component 38 is connected to the mold sleeve diversion hole 25, the rotating mold fixing head 33 is fixed on the mold sleeve 2 and is located on the right side of the mold sleeve 2, and the rotating mold hole 34 is connected to the mold sleeve hole 24.

[0053] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the injection holes 36 can be multiple and distributed symmetrically or asymmetrically.

[0054] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold core is an integrated structure.

[0055] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the mold sleeve is an integrated structure.

[0056] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the rotating mold is an integrated structure.

[0057] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the materials of the mold core, mold sleeve, and rotating mold can all be steel, iron, copper, or alloy.

[0058] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the driving device can be a motor and the driving component is a motor shaft.

[0059] The above-mentioned mold for manufacturing lightning protection cables is characterized in that the transmission component is a belt or a chain.

[0060] The above-mentioned mold for manufacturing lightning protection cables is characterized in that it can also be gear-driven.

[0061] When the mold for manufacturing lightning protection cables described above is used to produce lightning protection cables, the mold is first installed as described above, and the conductor 81 is passed through the mold core hole, the mold sleeve hole, and the rotating mold hole and pulled forward. Pay attention to the sealing between the rotating mold and the mold sleeve. If necessary, an anti-overflow pad can be added; the molten insulating layer material is squeezed from the extruder cavity to the extruder head and then enters Fig.10 The channel shown by the arrow is then sprayed outside the conductor. Since the driving device 4 causes the rotary mold 3 to rotate continuously and the conductor moves forward in a straight line, the plastic presents a spiral shape outside the conductor and is cooled to form an insulating layer 82. At the same time, a spiral groove 821 is formed between the spirals of the insulating layer 82, completing the manufacture of the lightning protection cable.

[0062] In the present embodiment, a plurality of injection holes can form a plurality of parallel spirals; when the plurality of injection holes are symmetrically distributed, the spacing between the plurality of spirals is equal, and when they are asymmetrical, the spacing between the plurality of spirals is unequal; in the present embodiment, since the pressure of the machine head is relatively high, the plastic can be continuously sprayed out and can be sprayed onto the conductor. Of course, a pipe with a certain hardness can also be connected to the injection hole to guide it to the vicinity of the conductor; in the present embodiment, the insulating material sprayed on the conductor can be slightly pressed through the mold to form a fixed diameter, so that the cable thickness is more uniform and more beautiful.

[0063] In the present application, the spiral groove of the lightning protection cable can strike an arc when struck by lightning. The arc moves along the spiral groove, which lengthens the distance and accelerates the attenuation. The phenomenon of burning the cable described in the background technology will not occur. The groove 811 can also strike an arc. In short, the groove 811 and the spiral groove are both arc-striking channels and have the same inventive concept.

[0064] In the present application, due to the use of a special mold, the lightning protection cable is conveniently produced. The mold has a simple structure, is easy to manufacture, is easy to master the production method, has low cost, high production efficiency, and a high finished product qualification rate.

[0065] The present invention has the following main beneficial effects: the mold structure is simple, easy to manufacture, easy to master the production method, low cost, high production efficiency and high finished product qualification rate.

[0066] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A mold for manufacturing lightning protection cables, consisting of a mold core and a mold sleeve, wherein the mold core is composed of a first mold core part, a second mold core part, and a third mold core part which are connected in sequence, wherein the first mold core part and the third mold core part are both cylindrical, and the second mold core part is a truncated cone column, and the first mold core part, the second mold core part, and the third mold core part have connected mold core holes inside, and the mold core holes penetrate along the axis direction of the mold core; characterized in that: The mold sleeve is composed of a mold sleeve body, a mold sleeve connector, and two groups of molding components. The mold sleeve body has a mold sleeve hole that penetrates along the axial direction of the mold sleeve. The left side of the mold sleeve hole is in the shape of a truncated cone and gradually becomes smaller from the left side of the mold sleeve body to the right side of the mold sleeve body. The right side of the mold sleeve hole is in the shape of a cylinder and the diameter of the cylinder is smaller than the diameter of the smallest part of the truncated cone of the left side of the mold sleeve hole. The axis of the left side of the mold sleeve hole coincides with the axis of the right side of the mold sleeve hole. The mold sleeve connector is in the shape of a circular cylinder and extends outward from the right surface of the mold sleeve body. The inner diameter of the mold sleeve connector is larger than the diameter of the cylinder of the right side of the mold sleeve hole and the axes of the two coincide. The molding component is located at The molded component is in the cylindrical hole on the right side of the mold sleeve hole and extends from the wall of the cylindrical hole in the axial direction. The molded component is composed of a lead-out component and a flow-blocking rod connected in sequence. One end of the lead-out component is connected to the hole wall of the cylindrical hole on the right side of the mold sleeve hole, and the other end of the lead-out component is connected to the outer edge of the flow-blocking rod. The flow-blocking rod is cylindrical in shape. The length of the flow-blocking rod is not less than the length of the right side of the mold sleeve hole. The left surface of the flow-blocking rod and the left surface of the right side of the mold sleeve hole are in the same plane. The length of the lead-out component is less than the length of the right side of the mold sleeve hole. The right side surface of the lead-out component is to the left of the right side surface of the right side of the mold sleeve hole. The two groups of molded components are symmetrically distributed in the mold sleeve hole. In the assembled state, the mold sleeve body of the mold sleeve is fixed on the outlet end wall of the sheath extruder head, the first part of the mold core is fixed on the inlet end wall of the sheath extruder head, the cone column hole part of the left part of the mold sleeve hole is located outside the second part of the mold core, the right side surface of the third part of the mold core does not extend out of the right side surface of the right part of the mold sleeve hole, the axis of the mold sleeve coincides with the axis of the mold core, and there is a gap between the outer wall of the third part of the mold core and the mold sleeve hole; The mold for manufacturing lightning protection cables is used to produce lightning protection cables. When the mold is installed, the conductor is passed through the mold core hole and the mold sleeve hole and pulled forward. When passing through the mold sleeve hole, a part of the blocking rod is embedded in the groove at the outer edge of the conductor, and the blocking rod wall is fitted with the groove wall. The molten insulating layer material is extruded from the extruder cavity to the extruder head and then enters the channel, and is then extruded outside the conductor. The blocking rod prevents the plastic from being squeezed into the groove, and the lead-out component allows the plastic to still form a complete insulating layer when passing through the mold sleeve hole. The molten insulating layer material is quickly cooled after exiting the mold sleeve hole, and the insulating layer material will not be stained in the groove, thereby completing the manufacture of the lightning protection cable. The mold core is an integrated structure; the mold sleeve is an integrated structure; the materials of the mold core and the mold sleeve are iron, copper or alloy.

2. A mold for manufacturing lightning protection cables according to claim 1, characterized in that The number of the molding parts is multiple.

3. A mold for manufacturing lightning protection cables, comprising a mold core and a mold sleeve, wherein the mold core is composed of a first mold core part, a second mold core part, and a third mold core part which are sequentially connected, wherein the first mold core part and the third mold core part are both cylindrical, and the second mold core part is a truncated cone column, wherein the first mold core part, the second mold core part, and the third mold core part have a connected mold core hole inside, and the mold core hole penetrates along the axis direction of the mold core; characterized in that: The mold for manufacturing the lightning protection cable also comprises a rotating mold, a driving device, and a transmission component; The mold sleeve is composed of a mold sleeve body and a mold sleeve connector. The mold sleeve body has a mold sleeve hole that penetrates along the axial direction of the mold sleeve. The left side of the mold sleeve hole is in the shape of a truncated cone and gradually becomes smaller from the left side of the mold sleeve body to the right side of the mold sleeve body. The right side of the mold sleeve hole is in the shape of a cylinder and the diameter of the cylinder is smaller than the diameter of the smallest part of the truncated cone of the left side of the mold sleeve hole. The axis of the left side of the mold sleeve hole coincides with the axis of the right side of the mold sleeve hole. The mold sleeve connector is in the shape of a circular cylinder and extends outward from the right surface of the mold sleeve body. The inner diameter of the mold sleeve connector is larger than the diameter of the cylinder of the right side of the mold sleeve hole and the axes of the two coincide. A mold sleeve diversion hole connected to the mold sleeve hole is provided above the right side of the mold sleeve hole. The rotary mold is composed of a rotary component, a rotary mold fixing head, a rotary mold guide sleeve, and a drainage component. The rotary mold fixing head is located on the left side of the rotary component, the rotary mold guide sleeve is located on the right side of the rotary mold fixing head, the rotary mold guide sleeve is an extension of the rotary mold fixing head, the rotary component is sleeved and fixed on the rotary mold fixing head and can rotate around the rotary mold fixing head, the outer surface of the rotary component is provided with a concave transmission groove, the rotary component is also provided with a plastic spraying hole that passes through left and right, the left side wall of the rotary component is provided with an annular concave plastic storage channel, the plastic storage channel is provided with a drainage component that extends to the left and communicates with the plastic storage channel, the plastic storage channel is connected to the plastic spraying hole, and the axial direction of the rotary mold is provided with a rotary mold hole that passes through left and right; The driving device has a driving component, and the transmission component is sleeved on the driving component and the transmission groove; In the assembled state, the mold sleeve body of the mold sleeve is fixed on the outlet end wall of the sheath extruder head, the first part of the mold core is fixed on the inlet end wall of the sheath extruder head, the cone column hole part of the left part of the mold sleeve hole is located outside the second part of the mold core, the right side surface of the third part of the mold core is tightly attached to the left side surface of the right side part of the mold sleeve hole, the axis of the mold sleeve coincides with the axis of the mold core, and there is a gap between the outer wall of the third part of the mold core and the mold sleeve hole; the drainage component is connected to the mold sleeve diversion hole, the rotating mold fixing head is fixed on the mold sleeve and is located on the right side of the mold sleeve, and the rotating mold hole is connected to the mold sleeve hole; The mold for manufacturing lightning protection cables is used to produce lightning protection cables. When the mold is installed, the conductor is passed through the mold core hole, the mold sleeve hole, and the rotating mold hole and pulled forward to seal the rotating mold and the mold sleeve; the molten insulating layer material is extruded from the extruder cavity to the extruder head and then enters the channel, and then sprayed on the outside of the conductor. The driving device rotates the rotating mold continuously, and the conductor moves forward in a straight line. The plastic presents a spiral shape outside the conductor, and is cooled to form an insulating layer. Spiral grooves are formed between the spirals of the insulating layer, and the manufacturing of the lightning protection cable is completed.

4. A mold for manufacturing a lightning protection cable according to claim 3, characterized in that The rotary mold is an integrated structure.

5. A mold for manufacturing a lightning protection cable according to claim 4, characterized in that The driving device is a motor, and the driving component is a motor shaft.

6. A mold for manufacturing a lightning protection cable according to claim 5, characterized in that The transmission component is a belt or a chain.

7. A mold for manufacturing a lightning protection cable according to claim 6, characterized in that The mold core is an integrated structure.

8. A mold for manufacturing a lightning protection cable according to claim 7, characterized in that The mold sleeve is an integrated structure.

9. A mold for manufacturing a lightning protection cable according to claim 8, characterized in that The materials of the mold core and the mold sleeve are iron, copper or alloy.

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