A method for manufacturing a low-smoke, halogen-free, flame-retardant, and fire-resistant B1-level power cable

Abstract

The present invention relates to the technical field of power cable manufacturing methods, and specifically, to a method for manufacturing a low-smoke, halogen-free, flame-retardant, and fire-resistant B1-level power cable. It includes a mixer and an extruder. The stirring and mixing is performed by rotating a stirring component. During the stirring process, the inner wall of the barrel is scratched to remove adhered materials, ensure accurate stirring amount, improve efficiency and uniformity, and reduce cleaning difficulty. When the stirring component rotates, it drives the height adjustment component to rotate in the same direction, increase shear force, break up agglomerated particles, improve mixing fineness, share pressure, and extend the life of the device. During operation, the material is guided to flow upward to enhance mixing, and when stopped, it is directed downward to the extruder. For materials containing light solid particles and low viscosity, the height adjustment component is moved downward to make the stirring rod face upward, generating an upward thrust to disperse the light particles and promote the circulation of low-viscosity materials. For materials such as heavier solid particles, the height adjustment component is moved upward to make the stirring rod face downward, generating a downward thrust to assist precipitation and effective shear stirring.

Description

Technical Field

[0001] The invention relates to the technical field of power cable manufacturing methods, and in particular to a method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-level power cable. Background Art

[0002] With the development of society, crowded public places such as shopping malls, schools, hospitals, subway stations, etc., as well as important facilities such as data centers, financial institutions, and communication hubs, have extremely high requirements for the continuity and safety of power supply. In these places, once a fire occurs, traditional power cables will not only fail to effectively prevent the spread of the fire, but may also affect the evacuation of personnel due to thick smoke and toxic gases, and even cause the power system to be paralyzed, causing huge losses. Therefore, in order to improve the safety and reliability of power transmission, while meeting environmental protection requirements and fire prevention needs in special places, low-smoke halogen-free flame-retardant and fire-resistant B1-level power cables came into being. This type of cable has significant advantages in flame retardancy, smoke production, toxic gas emissions, environmental protection characteristics, and ensuring the stability of the power system. It can effectively respond to emergencies such as fires and reduce risks and losses.

[0003] In the preparation process of low-smoke halogen-free flame retardant and fire-resistant B1 grade materials, in order to achieve good performance, polyethylene, ethylene-vinyl acetate copolymer, etc. are usually used as base resins, inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide, organic phosphorus flame retardants such as phosphate esters and phosphonates, refractory materials such as mica and ceramic silicone rubber, smoke suppressants such as molybdenum compounds and zinc compounds, as well as antioxidants, lubricants, fillers such as calcium carbonate and talc, coupling agents, etc.

[0004] In the actual preparation process, these materials need to be fully and evenly mixed to give full play to their optimal performance, so a mixer is usually required. For the mixing of low-smoke halogen-free flame retardant and fire-resistant B1 grade materials, on the one hand, it is crucial to keep the mixing equipment clean. After the existing mixer is used, it is often difficult to clean the inside thoroughly, and other materials or impurities are easily left. These residual substances mixed into the new batch of mixing may change the composition ratio of the material, trigger chemical reactions, cause the local performance of the product to decline, reduce purity and stability, and thus affect its flame retardant, fire resistant and other key properties. On the other hand, different materials have different physical and chemical properties, such as viscosity, particle size, density, etc. However, the existing mixer has limitations in the choice of stirring mode and intensity, and often cannot accurately adapt to various materials. Improper stirring mode and intensity may not achieve fully uniform mixing, and may even destroy the material structure, causing the additive to fail, and ultimately affecting the performance of the material. Summary of the invention

[0005] The object of the present invention is to provide a method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-class power cable to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides a method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-level power cable, comprising the following steps:

[0007] S1. Weigh the materials according to the proportion and put them into the mixer;

[0008] S2, start the stirring component to mix the various materials thoroughly;

[0009] S3. When the height adjustment component moves to near the top in the stirring component, the material containing heavier solid particles and the material to be precipitated and separated is stirred and mixed, helping the solid particles to settle faster;

[0010] S4. When the height adjustment component moves to the bottom of the stirring component, the material containing a large number of light solid particles and fibers is stirred and mixed, which helps to keep the light particles evenly dispersed in the liquid and prevent them from sinking;

[0011] S5. Add the mixed materials into an extruder, extrude them into an insulation layer or a sheath layer of the cable by means of a die, cool the extruded cable layer to shape it and keep it dimensionally stable, assemble the cable insulation layer, the sheath layer and the conductor to form a complete power cable;

[0012] Wherein, the mixer comprises a barrel, a lower hopper, a support block, an inclined rod, a stirring assembly, a height adjustment assembly and a piston, the barrel is fixedly connected to the top of the extruder discharge port, the top of the barrel is fixedly connected to the hopper, the inner wall of the hopper is fixedly connected to a plurality of inclined rods, a support block is fixedly connected between the ends of the plurality of inclined rods, the support block is movably connected to the stirring assembly inside, the stirring assembly is movably connected to the height adjustment assembly inside, the outer wall of the stirring assembly is movably connected to a plurality of pistons, and the stirring assembly is located inside the barrel;

[0013] The stirring component is used to fully mix the various materials inside the barrel, and at the same time to scratch and clean the inner wall of the barrel to maintain the cleanliness of the inner wall of the barrel. The height adjustment component is used to adjust the stirring mode of the stirring component, and at the same time to guide the material inside the barrel and reduce the stirring energy consumption of the stirring component.

[0014] As a further improvement of the present technical solution, the stirring assembly includes a motor, which is fixedly connected to the inside of the support block, and the end of the motor output shaft passing through the support block is fixedly connected to a rotating rod, and a plurality of stirring rods are movably connected inside the rotating rod, and a piston is provided between the outer wall of the stirring rod and the inside of the outer wall of the rotating rod, and the end of the stirring rod passing through the rotating rod is fixedly connected to a blade, and the blade is movably connected to the inner wall of the barrel, and a height adjustment assembly is fixedly connected between the ends of the plurality of stirring rods, and the height adjustment assembly is movably connected inside the rotating rod.

[0015] As a further improvement of the present technical solution, the stirring rod comprises a thick rod, which is movably connected to the inside of a rotating rod, a piston is provided between the outer wall of the thick rod and the outer wall of the rotating rod, the thick rod passing through the inside of the rotating rod and being movably connected to a thin rod, an elastic part is fixedly connected between the end of the thin rod and the inner bottom of the thick rod, one end of the thin rod passing through the thick rod is movably connected to a thin block, a blade is fixedly connected to the end of the thin block, and the other end of the thick rod is movably connected to a thick block, the thin block and the outer walls on both sides of the thick block are fixedly connected with a rotating shaft, the rotating shaft of the coarse block is movably connected to the inside of the thick rod, the rotating shaft of the thin block is movably connected to the inside of the thin rod, and a height adjustment component is fixedly connected between the ends of multiple coarse blocks.

[0016] As a further improvement of the technical solution, the piston is fixedly connected to the inside of the outer wall of the rotating rod, a thick rod is movably connected to the inside of the piston, and the piston is made of rubber.

[0017] As a further improvement of the present technical solution, the height adjustment assembly includes a support rod, which is fixedly connected between the ends of multiple thick blocks, the support rod is located inside the rotating rod, the top of the support rod is fixedly connected to a circular plate, the top of the circular plate is fixedly connected to a cylinder, the cylinder is fixedly connected inside the rotating rod near the top, and one end of the support rod that passes through the bottom of the rotating rod is fixedly connected to a guide plate.

[0018] As a further improvement of the technical solution, the guide plate is in a conical shape and is made of Teflon.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the method for manufacturing low-smoke halogen-free flame-retardant and fire-resistant B1-level power cable, materials suitable for manufacturing low-smoke halogen-free flame-retardant and fire-resistant B1-level power cable are input into the material barrel from the lower hopper according to appropriate proportions, and various materials are stirred and mixed by the rotation of the stirring component; and during the stirring process, the stirring component scrapes the inner wall of the material barrel, so that the materials adhering to the inner wall of the material barrel can be removed in time, ensuring that the amount of materials involved in the stirring is accurate, which not only improves the stirring efficiency, but also enhances the mixing uniformity, and at the same time reduces the difficulty of subsequent cleaning of the material barrel, reducing the cleaning time and the use of cleaning agents;

[0021] 2. In the method for manufacturing the low-smoke halogen-free flame-retardant and fire-resistant B1-level power cable, when the stirring component rotates and stirs, it will drive the height adjustment component to rotate in the same direction as the stirring component, which can not only increase the shear force on the material, help to break up the agglomerated material particles, and further improve the fineness of the mixing, but also to a certain extent share the pressure of the material on the stirring device, reduce the load of the stirring device, and extend its service life; at the same time, when the stirring component is running, it guides the material to flow upward, promotes the circulation of the whole material, and enhances the mixing effect; and when the stirring component stops, it guides the material downward, and introduces the mixed material into the extruder;

[0022] 3. In the method for manufacturing the low-smoke halogen-free flame-retardant and fire-resistant B1-level power cable, when it is necessary to mix the material containing light solid particles and low viscosity in the low-smoke halogen-free flame-retardant and fire-resistant B1-level preparation material, the stirring rod in the stirring component is driven upward by moving the height adjustment component downward; in this way, the upward thrust generated by the upwardly inclined stirring rod during rotation helps to evenly disperse the light particles in the liquid to prevent them from sinking, and can promote the circulation of the material with low viscosity in the axial direction to enhance the mixing effect;

[0023] 4. In the method for manufacturing the low-smoke halogen-free flame retardant and fire-resistant B1 grade power cable, when it is necessary to process the low-smoke halogen-free flame retardant and fire-resistant B1 grade preparation material with heavier solid particles, materials that need to be precipitated and separated, and materials with higher viscosity that require stronger shear force to break the internal structure to achieve mixing, the stirring rod in the stirring assembly is driven downward by moving the height component upward; at this time, the downward thrust generated by the downward-tilted stirring rod can help the solid particles to settle faster, and can more effectively shear and stir the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the stirring device of the present invention;

[0026] Figure 3 It is a schematic diagram of the downward stirring process structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the upward stirring process structure of the present invention;

[0028] Figure 5 A top view of the barrel of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the stirring assembly of the present invention;

[0030] Figure 7 It is a schematic diagram of the height adjustment component structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the stirring rod structure of the present invention.

[0032] The meaning of each number in the figure is:

[0033] 1. mixer; 11. barrel; 110. hopper; 12. support block; 120. inclined rod;

[0034] 13. stirring assembly; 130. rotating rod; 131. motor; 132. stirring rod; 1320. thick rod; 1321. thin rod; 1322. elastic member; 1323. thin block; 1324. thick block; 133. blade;

[0035] 14. Height adjustment assembly; 140. Support rod; 141. Guide plate; 142. Round plate; 143. Cylinder;

[0036] 15. Piston;

[0037] 2. Extruder. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. Example 1

[0040] See also Figure 1-Figure 8 As shown, the purpose of this embodiment is to provide a method for manufacturing a low-smoke halogen-free flame-retardant and fire-resistant B1 class power cable, comprising the following steps:

[0041] S1, weigh the materials according to the proportion and put them into the mixer 1;

[0042] S2, start the stirring component 13 to mix and stir the various materials thoroughly;

[0043] S3, when the height adjustment component 14 moves to near the top in the stirring component 13, the material containing heavier solid particles and the material to be separated by precipitation are stirred and mixed, so as to help the solid particles to precipitate faster;

[0044] S4, when the height adjustment component 14 moves to the bottom in the stirring component 13, the material containing a large number of light solid particles and fibers is stirred and mixed, which helps to keep the light particles uniformly dispersed in the liquid and prevent them from sinking;

[0045] S5, adding the mixed material into the extruder 2, extruding the material into the insulating layer or sheath layer of the cable by means of a die, cooling the extruded cable layer to shape it and keep it dimensionally stable, assembling the cable insulating layer, sheath layer and conductor to form a complete power cable;

[0046] The mixer 1 includes a barrel 11, a lower hopper 110, a support block 12, an inclined rod 120, a stirring assembly 13, a height adjustment assembly 14 and a piston 15. The barrel 11 is fixedly connected to the top of the discharge port of the extruder 2. The top of the barrel 11 is fixedly connected to the hopper 110. The inner wall of the hopper 110 is fixedly connected to a plurality of inclined rods 120. The ends of the plurality of inclined rods 120 are fixedly connected to the support block 12. The stirring assembly 13 is movably connected inside the support block 12. The height adjustment assembly 14 is movably connected inside the stirring assembly 13. The outer wall of the stirring assembly 13 is movably connected to a plurality of pistons 15. The stirring assembly 13 is located inside the barrel 11.

[0047] The stirring component 13 is used to fully mix the various materials inside the barrel 11, and at the same time to scratch and clean the inner wall of the barrel 11 to maintain the cleanliness of the inner wall of the barrel 11. The height adjustment component 14 is used to adjust the stirring mode of the stirring component 13, and at the same time to guide the materials inside the barrel 11 and reduce the stirring energy consumption of the stirring component 13.

[0048] The improvement of this embodiment is that: the materials suitable for making low-smoke halogen-free flame-retardant and fire-resistant B1-level power cables are input into the barrel 11 from the lower hopper 110 according to appropriate proportions, and the various materials are stirred and mixed by the rotation of the stirring component 13; and during the stirring process, the stirring component 13 scrapes the inner wall of the barrel 11, so that the materials adhering to the inner wall of the barrel 11 can be removed in time, ensuring that the amount of materials involved in the stirring is accurate, which not only improves the stirring efficiency, but also enhances the mixing uniformity, and at the same time reduces the difficulty of subsequent cleaning of the barrel 11, reducing the cleaning time and the use of cleaning agents;

[0049] When the stirring component 13 rotates and stirs, it will also drive the height adjustment component 14 to rotate in the same direction as the stirring component 13, which can not only increase the shear force on the material, help to break up the agglomerated material particles, and further improve the fineness of the mixing, but also to a certain extent share the pressure of the material on the stirring device, reduce the load of the stirring device, and extend its service life; at the same time, when the stirring component 13 is running, it guides the material to flow upward, promotes the circulation of the whole material, and enhances the mixing effect; and when the stirring component 13 stops, it guides the material downward, and introduces the mixed material into the extruder 2;

[0050] Among them, the existing materials suitable for the production of low-smoke halogen-free flame retardant and fire-resistant B1 grade power cables include: base materials, such as polyethylene (PE), cross-linked polyethylene (XLPE), and ethylene-vinyl acetate copolymer (EVA); flame retardants, including inorganic flame retardants such as magnesium hydroxide, aluminum hydroxide, and organic phosphorus flame retardants such as phosphate esters and phosphonates; refractory materials such as mica and ceramic silicone rubber; smoke suppressants such as molybdenum compounds and zinc compounds; antioxidants such as hindered phenol antioxidants and phosphite antioxidants; lubricants such as silicone oil and fatty acid esters; fillers such as calcium carbonate and talc; and coupling agents such as silane coupling agents and titanate coupling agents.

[0051] First, the specific structure of the stirring assembly 13 is disclosed. The stirring assembly 13 includes a motor 131. The motor 131 is fixedly connected to the inside of the support block 12. The end of the output shaft of the motor 131 passing through the support block 12 is fixedly connected to a rotating rod 130. A plurality of stirring rods 132 are movably connected inside the rotating rod 130. A piston 15 is provided between the outer wall of the stirring rod 132 and the inner part of the outer wall of the rotating rod 130. The end of the stirring rod 132 passing through the rotating rod 130 is fixedly connected to a blade 133. The blade 133 is movably connected to the inner wall of the barrel 11. A height adjustment assembly 14 is fixedly connected between the ends of the plurality of stirring rods 132. The height adjustment assembly 14 is movably connected inside the rotating rod 130.

[0052] The output shaft of the motor 131 rotates to drive the rotating rod 130 to rotate, and the rotating rod 130 rotates to drive the stirring rod 132 inside it to rotate, so that the multiple stirring rods 132 stir and mix the multiple materials inside the barrel 11. At the same time, during the rotation of the stirring rod 132, the blade 133 is driven to rotate along the inner wall of the barrel 11, so that the blade 133 scrapes the material on the inner wall of the barrel 11, so that the material adhering to the inner wall of the barrel 11 is removed in time, ensuring the accuracy of the amount of material involved in the stirring, improving the stirring efficiency and mixing uniformity, and reducing the difficulty of subsequent cleaning of the barrel 11, reducing the cleaning time and the use of cleaning agents.

[0053] The stirring rod 132 includes a thick rod 1320, which is movably connected to the inside of the rotating rod 130, and a piston 15 is provided between the outer wall of the thick rod 1320 and the outer wall of the rotating rod 130. The thick rod 1320 passes through the inside of the rotating rod 130 and is movably connected to a thin rod 1321, and an elastic member 1322 is fixedly connected between the end of the thin rod 1321 and the inner bottom of the thick rod 1320. One end of the thin rod 1321 passing through the thick rod 1320 is movably connected to a thin block 1323, and a blade 133 is fixedly connected to the end of the thin block 1323, and the other end of the thick rod 1320 is movably connected to a thick block 1324, and the outer walls of both sides of the thin block 1323 and the thick block 1324 are fixedly connected with a rotating shaft, the rotating shaft of the thick block 1324 is movably connected to the inside of the thick rod 1320, and the rotating shaft of the thin block 1323 is movably connected to the inside of the thin rod 1321, and a height adjustment component 14 is fixedly connected between the ends of multiple thick blocks 1324;

[0054] By pressing the thin rod 1321 to drive the elastic member 1322 to contract, the thin rod 1321 can be conveniently contracted inside the thick rod 1320, and the length between the thin rod 1321 and the thick rod 1320 can be adjusted, thereby adjusting the distance between the blade 133 and the rotating rod 130, so that the stirring assembly 13 is conveniently applicable to the inside of the barrel 11 of various diameters. In addition, during the rotation of the rotating rod 130, the centrifugal force is released on the thin rod 1321 and the elastic member 1322, so that the thin rod 1321 and the elastic member 1322 are stretched outward. During the process of the thin rod 1321 stretching outward, an extrusion force is applied to the blade 133, thereby increasing the scraping force of the blade 133, making it convenient to clean materials with higher viscosity, so that the blade 133 can clean the inner wall of the barrel 11 more fully.

[0055] Secondly, the specific structure of the height adjustment component 14 is disclosed. The height adjustment component 14 includes a support rod 140, which is fixedly connected between the ends of a plurality of thick blocks 1324. The support rod 140 is located inside the rotating rod 130. A circular plate 142 is fixedly connected to the top of the support rod 140. A cylinder 143 is fixedly connected to the top of the circular plate 142. The cylinder 143 is fixedly connected to the inside of the rotating rod 130 near the top. One end of the support rod 140 passing through the bottom of the rotating rod 130 is fixedly connected to a guide plate 141.

[0056] The piston rod of the cylinder 143 pushes the circular plate 142 to slide inside the rotating rod 130, so that the circular plate 142 drives the support rod 140 to move up and down. The height of the plurality of thick blocks 1324 is adjusted by the up and down movement of the support rod 140. When the thick block 1324 and the thick rod 1320 are in a horizontal state, the stirring direction of the thick rod 1320 and the thin rod 1321 is in a horizontal state. At this time, the thin block 1323 and the thin rod 1321 are also in a horizontal state, which is convenient for stirring most materials that do not have special shapes;

[0057] The rotating rod 130 is rotated to drive the support rod 140 inside it to rotate in the same direction as the rotating rod 130, and the support rod 140 is rotated to drive the guide plate 141 to rotate, wherein the guide plate 141 is in a conical state. According to the shape characteristics of the guide plate 141 itself, the guide plate 141 has an upward conical slope, which guides the material to flow upward during the rotation process, promotes the circulation of the whole material, enhances the mixing effect, and brings up most of the material at the bottom of the barrel 11, preventing the heavier or more viscous material from being deposited at the bottom, increasing the shear force on the material, and helping to break up the agglomerated material particles, further improving the fineness of the mixing;

[0058] When the rotating rod 130 stops rotating, the guide plate 141 stops rotating, so that the material inside the barrel 11 slides downward along the conical surface of the guide plate 141, wherein the guide plate 141 is made of Teflon material. The Teflon material of the guide plate 141 has excellent non-stickiness, high temperature resistance and chemical corrosion resistance, which prevents the material from sticking to the guide plate 141 and smoothly introduces the mixed material into the extruder 2.

[0059] The piston 15 is fixedly connected to the inner part of the outer wall of the rotating rod 130, and the thick rod 1320 is movably connected inside the piston 15. The piston 15 is made of rubber. When the support rod 140 moves up and down and the angle of the thick rod 1320 inside the rotating rod 130 is adjusted, the piston 15 is squeezed. According to the high rebound characteristic of its own rubber material, the piston 15 always clamps the thick rod 1320 to maintain the density between the thick rod 1320 and the rotating rod 130, avoiding material from flowing into the rotating rod 130, and facilitating the piston 15 to shrink and squeeze in time when the angle of the thick rod 1320 is adjusted, squeeze the inclined thick rod 1320, and support the thick rod 1320.

[0060] In summary, the working principle of this solution is as follows:

[0061] The output shaft of the motor 131 rotates to drive the rotating rod 130 to rotate, and then the stirring rod 132 inside the rotating rod 130 rotates, so that the multiple stirring rods 132 stir and mix the various materials in the barrel 11; pressing the thin rod 1321 can drive the elastic member 1322 to contract, and the thin rod 1321 is contracted inside the thick rod 1320, so as to adjust the length between the thin rod 1321 and the thick rod 1320, and thus adjust the distance between the blade 133 and the rotating rod 130, so that the stirring assembly 13 is suitable for barrels 11 of various diameters; and, when the rotating rod 130 During the rotation, centrifugal force is released on the thin rod 1321 and the elastic member 1322, so that the thin rod 1321 and the elastic member 1322 are stretched outward. During the outward stretching process of the thin rod 1321, an extrusion force is applied to the blade 133, which increases the scraping force of the blade 133, facilitates the timely removal of materials adhering to the inner wall of the barrel 11, improves the degree of scraping and cleaning of materials with high viscosity on the inner wall of the barrel 11, ensures the accuracy of the amount of materials involved in the mixing, improves the mixing efficiency and mixing uniformity, and reduces the difficulty of subsequent cleaning of the barrel 11, reducing the cleaning time and the use of cleaning agents;

[0062] The piston rod of the cylinder 143 pushes the circular plate 142 to slide inside the rotating rod 130, driving the support rod 140 to move up and down, thereby adjusting the height of the plurality of thick blocks 1324; when the thick block 1324 and the thick rod 1320 are in a horizontal state, the stirring direction of the thick rod 1320 and the thin rod 1321 is in a horizontal state, and at this time the thin block 1323 and the thin rod 1321 are also in a horizontal state, which is convenient for stirring most materials without special shapes;

[0063] When the rotating rod 130 rotates, the support rod 140 inside it is driven to rotate in the same direction. The rotation of the support rod 140 drives the cone-shaped guide plate 141 to rotate; the upward conical slope of the guide plate 141 guides the material to flow upward during the rotation process, promotes the circulation of the entire material, enhances the mixing effect, and can also bring most of the material at the bottom of the barrel 11 upward to prevent heavier or more viscous materials from depositing at the bottom, increase the shear force on the material, help break up the agglomerated material particles, and further improve the fineness of the mixing; when the rotating rod 130 stops rotating, the guide plate 141 stops rotating, and the material in the barrel 11 slides downward along the conical surface of the guide plate 141; because the guide plate 141 is made of Teflon, it has excellent non-stickiness, high temperature resistance and chemical corrosion resistance, avoids material sticking, and facilitates the smooth introduction of the mixed material into the extruder 2;

[0064] Among them, when the support rod 140 moves up and down to adjust the angle of the thick rod 1320 inside the rotating rod 130, the piston 15 will be squeezed; since the rubber material of the piston 15 itself has high resilience characteristics, it can always clamp the thick rod 1320, maintain the sealing between the thick rod 1320 and the rotating rod 130, and prevent the material from flowing into the rotating rod 130, and when the angle of the thick rod 1320 is adjusted, the piston 15 can shrink and squeeze in time to support the inclined thick rod 1320. Example 2

[0065] See also Figure 3 As shown, the stirring rod 132 in the present application has a stirring force inclined downward, when it is necessary to mix some filler materials with heavier solid particles that need to be separated by precipitation, and those with higher viscosity that require stronger shear force to break the structure to achieve mixing, such as calcium carbonate, and ceramic silicone rubber materials with higher viscosity that require stronger shear force to mix, and some organic phosphorus flame retardant materials, such as phosphate esters and phosphonates, in the low-smoke halogen-free flame retardant and fire-resistant B1 grade preparation materials;

[0066] The piston rod of the cylinder 143 pushes the circular plate 142 upward, so that the circular plate 142 applies an upward pulling force to the support rod 140; as the support rod 140 moves upward, the coarse block 1324 is driven upward; when one end of the coarse block 1324 is lifted upward, the other end of the coarse rod 1320 will tilt downward, so that the thin rod 1321 at the other end of the coarse rod 1320 moves downward along the end of the coarse rod 1320, thereby forming a downward tilted stirring angle between the stirring rod 132 and the rotating rod 130; in this way, the downward stirring force generated by the downward tilted stirring rod 132 during rotation can help the solid particles to settle faster, and can more effectively shear and stir the material. Example

[0067] See also Figure 4 As shown, the stirring rod 132 in the present application has an upwardly inclined stirring force, when it is necessary to mix filler materials with light solid particle characteristics such as talcum powder in the low-smoke halogen-free flame retardant and fire-resistant B1 grade preparation materials, and lubricant materials with low viscosity such as silicone oil or some types of fatty acid esters;

[0068] The circular plate 142 is pushed downward by the piston rod of the cylinder 143, and the circular plate 142 applies a downward thrust to the support rod 140; as the support rod 140 moves downward, the thick block 1324 is driven downward; when one end of the thick block 1324 is pressed downward, the other end of the thick rod 1320 will tilt upward, so that the thin rod 1321 at the other end of the thick rod 1320 moves upward along the end of the thick rod 1320, thereby forming an upward tilted stirring angle between the stirring rod 132 and the rotating rod 130; in this way, the upward thrust generated by the upward tilted stirring rod 132 during rotation helps to keep the light particles evenly dispersed in the liquid and prevent them from sinking, and can also push the material with lower viscosity to circulate in the axial direction, thereby enhancing the mixing effect.

[0069] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for manufacturing a low-smoke, halogen-free, flame-retardant, and fire-resistant B1-level power cable, characterized in that: The steps include: S1, weigh the materials according to the proportion and put them into the mixer (1); S2, starting the stirring component (13) to mix and stir the various materials thoroughly; S3, when the height adjustment component (14) moves to near the top in the stirring component (13), stirring and mixing the material containing heavier solid particles and the material to be separated by sedimentation is achieved, thereby helping the solid particles to settle faster; S4, when the height adjustment component (14) moves to near the bottom in the stirring component (13), stirring and mixing the material containing a large number of light solid particles and fibers is achieved, which helps to keep the light particles evenly dispersed in the liquid and prevent them from sinking; S5, adding the mixed material into the extruder (2), extruding the material through a die to form an insulation layer or a sheath layer of the cable, cooling the extruded cable layer to shape it and keep it dimensionally stable, assembling the cable insulation layer, sheath layer and conductor to form a complete power cable; The mixer (1) comprises a material barrel (11), a lower hopper (110), a support block (12), an inclined rod (120), a stirring assembly (13), a height adjustment assembly (14) and a piston (15); the material barrel (11) is fixedly connected to the top of the material discharge port of the extruder (2); the material barrel (11) is fixedly connected to the top of the material barrel (11); a plurality of inclined rods (120) are fixedly connected to the inner wall of the hopper (110); a support block (12) is fixedly connected between the ends of the plurality of inclined rods (120); a stirring assembly (13) is movably connected inside the support block (12); a height adjustment assembly (14) is movably connected inside the stirring assembly (13); a plurality of pistons (15) are movably connected to the outer wall of the stirring assembly (13); and the stirring assembly (13) is located inside the material barrel (11); The stirring component (13) is used to fully mix the various materials inside the barrel (11), and at the same time to scrape and clean the inner wall of the barrel (11) to maintain the cleanliness of the inner wall of the barrel (11). The height adjustment component (14) is used to adjust the stirring mode of the stirring component (13), and at the same time to guide the materials inside the barrel (11) and reduce the stirring energy consumption of the stirring component (13).

2. The method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-level power cable according to claim 1, characterized in that: The stirring assembly (13) comprises a motor (131), the motor (131) being fixedly connected to the inside of the support block (12), the end of the output shaft of the motor (131) passing through the support block (12) being fixedly connected to a rotating rod (130), a plurality of stirring rods (132) being movably connected to the inside of the rotating rod (130), a piston (15) being provided between the outer wall of the stirring rod (132) and the inside of the outer wall of the rotating rod (130), a blade (133) being fixedly connected to the end of the stirring rod (132) passing through the rotating rod (130), the blade (133) being movably connected to the inner wall of the barrel (11), a height adjustment assembly (14) being fixedly connected between the ends of the plurality of stirring rods (132), the height adjustment assembly (14) being movably connected to the inside of the rotating rod (130).

3. The method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-level power cable according to claim 2, characterized in that: The stirring rod (132) comprises a thick rod (1320), the thick rod (1320) being movably connected to the inside of the rotating rod (130), a piston (15) being provided between the outer wall of the thick rod (1320) and the outer wall of the rotating rod (130), the thick rod (1320) passing through the inside of the rotating rod (130) and being movably connected to a thin rod (1321), an elastic member (1322) being fixedly connected between the end of the thin rod (1321) and the inner bottom of the thick rod (1320), and the end of the thin rod (1321) passing through the inside of the thick rod (1320) and being movably connected to the inside A thin block (1323) is provided, the end of the thin block (1323) being fixedly connected to a blade (133), the other end of the thick rod (1320) being internally movably connected to a thick block (1324), the outer walls of both sides of the thin block (1323) and the thick block (1324) being fixedly connected to a rotating shaft, the rotating shaft of the thick block (1324) being movably connected to the inside of the thick rod (1320), the rotating shaft of the thin block (1323) being movably connected to the inside of the thin rod (1321), and a height adjustment assembly (14) being fixedly connected between the ends of a plurality of the thick blocks (1324).

4. The method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-level power cable according to claim 3, characterized in that: The piston (15) is fixedly connected to the inside of the outer wall of the rotating rod (130), and a thick rod (1320) is movably connected inside the piston (15). The piston (15) is made of rubber.

5. The method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-level power cable according to claim 3, characterized in that: The height adjustment assembly (14) comprises a support rod (140), the support rod (140) being fixedly connected between the ends of a plurality of thick blocks (1324), the support rod (140) being located inside the rotating rod (130), the top of the support rod (140) being fixedly connected to a circular plate (142), the top of the circular plate (142) being fixedly connected to a cylinder (143), the cylinder (143) being fixedly connected inside the rotating rod (130) near the top, and one end of the support rod (140) passing through the bottom of the rotating rod (130) being fixedly connected to a guide plate (141).

6. The method for manufacturing a low-smoke, halogen-free, flame-retardant and fire-resistant B1-level power cable according to claim 5, characterized in that: The guide plate (141) is in a conical shape and is made of Teflon material.

Images