Flame-retardant fire-resistant wire cable and preparation method thereof

Abstract

The invention discloses a flame-retardant fire-resistant wire cable and a preparation method thereof, and relates to the technical field of flame-retardant fire-resistant cables. The fire-resistant and flame-retardant performance of the cable is improved. Comprising a core wire main body and a protection part fixed on the outer wall of the core wire main body, the protection part comprises a shielding layer and a composite insulating layer, the shielding layer wraps the outer wall of the core wire main body, the composite insulating layer is sleeved on the outer wall of the shielding layer, the protection part further comprises a rubber layer and a flame-retardant layer, the rubber layer is sleeved on the outer wall of the composite insulating layer, and the flame-retardant layer is sleeved on the outer wall of the composite insulating layer. And the fireproof layer sleeves the outer wall of the flame-retardant layer. The flame-retardant and fire-resistant performance of the whole cable can be effectively improved by using the fire-resistant layer and the flame-retardant layer, when a fire occurs in a cable use environment, the fire-resistant time of the core wire main body can be effectively prolonged by using the fire-resistant layer and the flame-retardant layer, normal transmission of data is ensured, the outer coating layer is used as the outermost layer structure of the cable, and the service life of the cable is prolonged. The wear-resistant, corrosion-resistant and waterproof effects of the whole cable are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flame-retardant and fire-resistant cables, and particularly relates to a flame-retardant and fire-resistant wire and cable and a preparation method thereof. Background Art

[0002] In the prior art, wire and cable is a wire product used to transmit electric energy, information and realize the conversion of electromagnetic energy. As the main carrier of power transmission, with the improvement of people's safety awareness, people have higher and higher requirements for the flame retardancy, fire resistance and other properties of wire and cable. Flame-retardant and fire-resistant wire and cable is a key focus that people are currently more concerned about. In all fields of power application, the fire resistance of wire and cable plays a very important role in ensuring the integrity and effectiveness of the electrical system;

[0003] Current wire and cable includes PVC in terms of materials. PVC contains halogen elements, and the gases released, corrosive and toxic when it burns. In order to improve the flame retardancy of wire and cable, some flame retardants are usually added to its materials. However, most of the components of flame retardants are halogen-containing substances, which are highly harmful to the environment and the human body;

[0004] Based on this, in order to improve the flame retardancy and fire resistance of wire and cable, and reduce the volatilization of harmful substances during combustion and the harm caused to the human body, the present application proposes a flame-retardant and fire-resistant wire and cable and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a flame-retardant and fire-resistant wire and cable and a preparation method thereof.

[0006] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0007] A flame-retardant and fire-resistant wire and cable includes a core wire main body and a protection part fixed on the outer wall of the core wire main body. The protection part includes a shielding layer and a composite insulating layer. The shielding layer is wrapped on the outer wall of the core wire main body, and the composite insulating layer is sleeved on the outer wall of the shielding layer. The protection part further includes a rubber layer and a flame-retardant layer. The rubber layer is sleeved on the outer wall of the composite insulating layer, and the fire-resistant layer is sleeved on the outer wall of the flame-retardant layer. The outer layer of the fire-resistant layer is wrapped with an outer sheath layer.

[0008] Furthermore: The fire-resistant layer includes the following parts by weight in terms of composition, 2-5 parts of magnesium hydroxide; 1-2.5 parts of aluminum hydroxide; 2-3 parts of coupling agent, 90-100 parts of chloroprene rubber; 2-3 parts of stearic acid; 1-3 parts of expanded graphite; 4-5 parts of nickel oxide; 5-8 parts of polypropylene fiber; 8-10 parts of plasticizer; 3-6 parts of stabilizer; 2-5 parts of sodium carboxymethyl cellulose; 0.5-1 part of colorant;

[0009] The flame retardant layer comprises, by weight parts, 7-9 parts of anti-aging masterbatch; 80-98 parts of cis-butadiene rubber; 85-97 parts of nitrile rubber; 5-7 parts of lubricant; 0.2-0.5 parts of coupling agent; and 6-9 parts of calcium carbonate.

[0010] A preparation method of a flame retardant and fire resistant wire and cable comprises the following steps:

[0011] 1: Mix the fire resistant layer and the flame retardant layer separately according to their different raw materials. When mixing the fire resistant layer, first introduce the raw materials into the stirring mechanism for stirring. The stirring time is 10-15 min, the rotation speed during stirring is 100-120 r / min, and after stirring, material A is formed.

[0012] 2: When mixing the flame retardant layer, introduce the required raw materials for its preparation into the stirring mechanism for mixing and stirring. The stirring time is 15-20 min, the rotation speed during stirring is 150-170 r / min, and after stirring, material B is formed.

[0013] 3: Respectively introduce the prepared material A and material B into the open mill for open milling. The open mill is a double-roll type. After open milling and blending the material A and material B, cut them. The temperature range for open milling is 150 °C, and the open milling time is 10-15 min.

[0014] 4: Press the open-milled material A and material B into sheets. The temperature range during pressing is 150-160 °C, the time is 5-8 min, and the pressure for sheet pressing and forming is 14 MPa.

[0015] 5: Wrap the pressed material B as the flame retardant layer on the outer wall of the rubber layer, and wrap the pressed material A as the fire resistant layer on the outer wall of the flame retardant layer.

[0016] Further: The stirring mechanism includes a stirring cylinder, an air cylinder and a rotating rod. The rotating rod is movably connected to the inner wall of the through hole opened at the top of the stirring cylinder. The side wall of the stirring cylinder is welded with support legs, and the air cylinder is welded to the bottom of the rotating rod. The inner wall of the through hole opened at the bottom of the air cylinder is movably connected with a piston rod, and the top of the piston rod is welded with a piston plate. A first spring is clamped between the top of the piston plate and the inner wall of the top of the air cylinder. A support is welded to the circumferential outer wall of the air cylinder, and an adjusting rod is movably connected to the inner wall of the support. The bottom of the piston rod is welded with a disc seat, and a stirring rod is movably connected to the inner wall of the disc seat. The stirring rod and the adjusting rod are movably connected.

[0017] Further: An L-shaped plate is fixed to the outer wall of the top of the stirring cylinder by bolts, and a driving motor is fixed to the outer wall of the top of the L-shaped plate by bolts. The output end of the driving motor and the circumferential outer wall of the rotating rod are both fixed with belt pulleys by screws, and the two belt pulleys are driven by a synchronous belt.

[0018] As a preferred solution of the present invention: A vertical plate is fixed to the outer wall of the top of the mixing drum by bolts, and a receiving shell is welded to the outer wall of one side of the vertical plate. An expansion airbag is adhered to the inner wall of one side of the receiving shell, and a stainless steel pipe is welded to the outer wall of one side of the receiving shell, and a fixed connection is provided between the stainless steel pipe and the expansion airbag.

[0019] As a further solution of the present invention: One end of the stainless steel pipe is fixed with a rotary joint, and a movable connection is provided between the rotary joint and the rotary rod.

[0020] As a still further solution of the present invention: A lining plate is fixed to the outer wall of the top of the mixing drum by bolts, and a through hole opened on the surface of the lining plate is movably connected with a pressing rod. One end of the pressing rod is welded with a U-shaped frame, and a roller is movably connected to the inner wall of the U-shaped frame. A second spring is sleeved on the outer wall of the pressing rod, and a cam for cooperating with the roller is fixed to the circumferential outer wall of the rotary rod by screws.

[0021] On the basis of the foregoing solution: A driving rod is fixed to the top of the piston plate by bolts, and an anti-blocking ring adapted to the inner diameter of the conical feeding cylinder is welded to the top of the driving rod.

[0022] On the basis of the foregoing solution: A feeding pipe is fixed to the outer wall of the top of the mixing drum by bolts, and a conical feeding cylinder is welded to one end of the feeding pipe. A discharging valve is fixed to the bottom of the mixing drum by bolts.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. For a flame-retardant and fire-resistant wire and cable, the shielding layer plays a role in shielding external interference signals, thereby avoiding the influence on data transmission. By providing a rubber layer, the flexibility of the entire cable is improved, and its anti-bending ability is enhanced. When the cable needs to be bent into a certain arc, creases are avoided.

[0025] 2. For a preparation method of a flame-retardant and fire-resistant wire and cable, the use of a fire-resistant layer and a flame-retardant layer can effectively improve the flame-retardant and fire-resistant properties of the entire cable. When a fire breaks out during the use of the cable, the fire-resistant layer and the flame-retardant layer can effectively extend the fire-resistant time of the core wire body, ensuring the normal transmission of data. The outer sheath, as the outermost structure of the cable, effectively improves the wear resistance, corrosion resistance, and waterproof effect of the entire cable.

[0026] 3. For a preparation method of a flame-retardant and fire-resistant wire and cable, by providing a movable connection between the piston rod in the stirring mechanism and the air cylinder, the angle between the adjusting rod and the stirring rod can be adjusted within a certain range, and thus the stirring range of the adjusting rod and the stirring rod can be adjusted to a certain extent.

[0027] 4. A preparation method of a flame-retardant and fire-resistant wire and cable. By providing an expansion airbag, after being squeezed, the gas inside it is introduced into the air cylinder through a stainless steel pipe, so that the angle between the stirring rod and the adjusting rod changes to realize the mixing and stirring of the preparation raw materials. Brief Description of the Drawings

[0028] Figure 1 is the overall structural schematic diagram of a flame-retardant and fire-resistant wire and cable proposed by the present invention;

[0029] Figure 2 is the overall structural schematic diagram of the stirring mechanism of a preparation method of a flame-retardant and fire-resistant wire and cable proposed by the present invention;

[0030] Figure 3 is the internal structural schematic diagram of the stirring mechanism of a preparation method of a flame-retardant and fire-resistant wire and cable proposed by the present invention;

[0031] Figure 4 is the main structural schematic diagram of the stirring mechanism of a preparation method of a flame-retardant and fire-resistant wire and cable proposed by the present invention;

[0032] Figure 5 is the partial explosion structural schematic diagram of the stirring mechanism of a preparation method of a flame-retardant and fire-resistant wire and cable proposed by the present invention;

[0033] Figure 6 is the overall explosion structural schematic diagram of the stirring mechanism of a preparation method of a flame-retardant and fire-resistant wire and cable proposed by the present invention.

[0034] In the figure: core wire body 1A; shielding layer 2A; rubber layer 3A; outer sheath layer 4A; fire-resistant layer 5A; flame-retardant layer 6A; composite insulation layer 7A; stirring cylinder 1; support leg 2; driving motor 3; conical feeding cylinder 4; feeding pipe 5; stainless steel pipe 6; vertical plate 7; L-shaped plate 8; feeding valve 9; stirring rod 10; air cylinder 11; cam 12; adjusting rod 13; rotating rod 14; accommodating shell 15; lining plate 16; driving rod 17; anti-blocking ring 18; support 19; rotary joint 20; first spring 21; piston rod 22; piston plate 23; expansion airbag 24; second spring 25; extrusion rod 26; U-shaped frame 27; roller 28; disc seat 29. Detailed Description of the Embodiments

[0035] The technical solutions of this patent will be further described in detail below in combination with the specific embodiments.

[0036] The embodiments of this patent will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain this patent and should not be construed as a limitation to this patent.

[0037] Example 1:

[0038] A flame-retardant and fire-resistant wire and cable, as Figure 1 shown, includes a core wire body 1A and a protective part fixed to the outer wall of the core wire body 1A. The protective part includes a shielding layer 2A and a composite insulating layer 7A. The shielding layer 2A wraps around the outer wall of the core wire body 1A, and the composite insulating layer 7A is sleeved on the outer wall of the shielding layer 2A. The protective part also includes a rubber layer 3A and a flame-retardant layer 6A. The rubber layer 3A is sleeved on the outer wall of the composite insulating layer 7A, and the fire-resistant layer 5A is sleeved on the outer wall of the flame-retardant layer 6A. The outer layer of the fire-resistant layer 5A is wrapped with an outer sheath layer 4A;

[0039] When using the core wire body 1A as a carrier for power and data transmission, the shielding layer 2A plays a role in shielding external interference signals, thereby avoiding the influence on data transmission. By setting the rubber layer 3A, the flexibility of the entire cable is improved, and its anti-bending ability is enhanced. When the cable needs to be bent into a certain arc, creases are avoided. The fire-resistant layer 5A and the flame-retardant layer 6A can effectively improve the flame-retardant and fire-resistant properties of the entire cable. When a fire breaks out in the cable usage environment, the fire-resistant layer 5A and the flame-retardant layer 6A can effectively extend the fire-resistant time of the core wire body 1A, ensuring its normal data transmission. The outer sheath layer 4A, as the outermost structure of the cable, effectively improves the wear resistance, corrosion resistance, and waterproof effect of the entire cable;

[0040] The fire-resistant layer 5A includes the following parts by weight in terms of composition: 2 - 5 parts of magnesium hydroxide; 1 - 2.5 parts of aluminum hydroxide; 2 - 3 parts of coupling agent, 90 - 100 parts of chloroprene rubber; 2 - 3 parts of stearic acid; 1 - 3 parts of expanded graphite; 4 - 5 parts of nickel oxide; 5 - 8 parts of polypropylene fiber; 8 - 10 parts of plasticizer; 3 - 6 parts of stabilizer; 2 - 5 parts of sodium carboxymethyl cellulose; 0.5 - 1 part of coloring agent;

[0041] The flame-retardant layer 6A includes by weight: 7 - 9 parts of anti-aging masterbatch; 80 - 98 parts of cis-butadiene rubber; 85 - 97 parts of nitrile rubber; 5 - 7 parts of lubricant; 0.2 - 0.5 parts of coupling agent; 6 - 9 parts of calcium carbonate;

[0042] A preparation method of a flame-retardant and fire-resistant wire and cable includes the following steps:

[0043] 1: Mix the fire-resistant layer 5A and the flame-retardant layer 6A separately according to their different preparation raw materials. When mixing the fire-resistant layer 5A, first introduce the raw materials into the stirring mechanism for stirring. The stirring duration is 10 - 15 minutes, and the stirring speed is 100 - 120 r / min. After stirring, a material A is formed;

[0044] 2: When preparing the flame-retardant layer 6A, the raw materials required for its preparation are introduced into the stirring mechanism for mixing and stirring. The stirring duration is 15 - 20 minutes, the rotation speed during stirring is 150 - 170 r / min, and after stirring, material B is formed;

[0045] 3: The prepared material A and material B are respectively introduced into an open mill for open milling. The open mill is a two-roll type. After open milling and blending of material A and material B, they are cut. The temperature range for open milling is 150 °C, and the open milling duration is 10 - 15 minutes;

[0046] 4: The open-milled material A and material B are pressed into sheets. The temperature range during pressing is 150 - 160 °C, the duration is 5 - 8 minutes, and the pressure for pressing into sheets is 14 MPa;

[0047] 5: The material B after pressing into sheets is used as the flame-retardant layer 6A and wrapped around the outer wall of the rubber layer 3A. The material A after pressing into sheets is used as the fire-resistant layer 5A and wrapped around the outer wall of the flame-retardant layer 6A.

[0048] Example 2:

[0049] A flame-retardant and fire-resistant wire and cable, as Figure 1 shown, includes a core wire body 1A and a protective part fixed to the outer wall of the core wire body 1A. The protective part includes a shielding layer 2A and a composite insulating layer 7A. The shielding layer 2A is wrapped around the outer wall of the core wire body 1A, and the composite insulating layer 7A is sleeved on the outer wall of the shielding layer 2A. The protective part further includes a rubber layer 3A and a flame-retardant layer 6A. The rubber layer 3A is sleeved on the outer wall of the composite insulating layer 7A, and a fire-resistant layer 5A is sleeved on the outer wall of the flame-retardant layer 6A. The outer layer of the fire-resistant layer 5A is wrapped with an outer sheath layer 4A;

[0050] The fire-resistant layer 5A includes the following parts by weight in terms of composition: 2 - 5 parts of magnesium hydroxide; 2.5 - 4 parts of aluminum hydroxide; 3 - 4 parts of coupling agent, 90 - 100 parts of chloroprene rubber; 3 - 5 parts of stearic acid; 3 - 4 parts of expanded graphite; 4 - 5 parts of nickel oxide; 5 - 8 parts of polypropylene fiber; 8 - 10 parts of plasticizer; 3 - 6 parts of stabilizer; 2 - 5 parts of sodium carboxymethyl cellulose; 1 - 1.5 parts of colorant;

[0051] The flame-retardant layer 6A includes by weight: 7 - 9 parts of anti-aging masterbatch; 98 - 10 parts of cis-1,4-polybutadiene rubber; 85 - 97 parts of nitrile rubber; 7 - 9 parts of lubricant; 0.2 - 0.5 parts of coupling agent; 6 - 9 parts of calcium carbonate;

[0052] A method for preparing a flame-retardant and fire-resistant wire and cable includes the following steps:

[0053] 1: Mix the refractory layer 5A and the flame retardant layer 6A separately according to their different raw materials. When mixing the refractory layer 5A, first introduce the raw materials into the stirring mechanism for stirring. The stirring duration is 10 - 15 minutes, the rotation speed during stirring is 100 - 120 r / min, and after stirring, material A is formed.

[0054] 2: When mixing the flame retardant layer 6A, introduce the raw materials required for its preparation into the stirring mechanism for mixing and stirring. The stirring duration is 15 - 20 minutes, the rotation speed during stirring is 150 - 170 r / min, and after stirring, material B is formed.

[0055] 3: Respectively introduce the prepared material A and material B into the open mill for open milling. The open mill is a two-roll type. After open milling and blending of material A and material B, cut them. The temperature range for open milling is 150 °C, and the open milling duration is 10 - 15 minutes.

[0056] 4: Press the open-milled material A and material B into sheets. The temperature range during pressing is 150 - 160 °C, the duration is 5 - 8 minutes, and the pressure for sheet pressing is 14 MPa.

[0057] 5: Use the sheet-pressed material B as the flame retardant layer 6A to wrap the outer wall of the rubber layer 3A, and use the sheet-pressed material A as the refractory layer 5A to wrap the outer wall of the flame retardant layer 6A.

[0058] Example 3:

[0059] A flame-retardant and fire-resistant wire and cable, as Figure 1 shown, includes a core wire body 1A and a protective part fixed to the outer wall of the core wire body 1A. The protective part includes a shielding layer 2A and a composite insulating layer 7A. The shielding layer 2A wraps the outer wall of the core wire body 1A, and the composite insulating layer 7A is sleeved on the outer wall of the shielding layer 2A. The protective part also includes a rubber layer 3A and a flame retardant layer 6A. The rubber layer 3A is sleeved on the outer wall of the composite insulating layer 7A, and the refractory layer 5A is sleeved on the outer wall of the flame retardant layer 6A. The outer layer of the refractory layer 5A is wrapped with an outer sheath layer 4A;

[0060] The refractory layer 5A includes the following parts by weight in terms of composition: 5 - 6 parts of magnesium hydroxide; 1 - 2.5 parts of aluminum hydroxide; 3 - 4.5 parts of coupling agent, 90 - 100 parts of chloroprene rubber; 2 - 3 parts of stearic acid; 1 - 3 parts of expanded graphite; 5 - 8 parts of nickel oxide; 8 - 10 parts of polypropylene fiber; 8 - 10 parts of plasticizer; 3 - 6 parts of stabilizer; 5 - 7 parts of sodium carboxymethyl cellulose; 0.5 - 1 part of colorant;

[0061] The flame retardant layer 6A includes by weight: 7 - 9 parts of anti-aging masterbatch; 80 - 98 parts of cis-butadiene rubber; 97 - 108 parts of nitrile rubber; 5 - 7 parts of lubricant; 0.5 - 0.9 parts of coupling agent; 9 - 12 parts of calcium carbonate;

[0062] A preparation method of a flame-retardant and fire-resistant wire and cable, comprising the following steps:

[0063] 1: Mix the fire-resistant layer 5A and the flame-retardant layer 6A separately according to their different preparation raw materials. When mixing the fire-resistant layer 5A, first introduce the raw materials into the stirring mechanism for stirring. The stirring duration is 10 - 15 min, the rotation speed during stirring is 100 - 120 r / min, and after stirring, material A is formed;

[0064] 2: When mixing the flame-retardant layer 6A, introduce the raw materials required for its preparation into the stirring mechanism for mixing and stirring. The stirring duration is 15 - 20 min, the rotation speed during stirring is 150 - 170 r / min, and after stirring, material B is formed;

[0065] 3: Respectively introduce the prepared material A and material B into the open mill for open milling. The open mill is a double-roll type. After open milling and blending the material A and material B, cut them. The temperature range for open milling is 150 °C, and the open milling duration is 10 - 15 min;

[0066] 4: Press the open-milled material A and material B into sheets. The temperature range during pressing is 150 - 160 °C, the duration is 5 - 8 min, and the pressure for sheet pressing is 14 MPa;

[0067] 5: Wrap the sheet-pressed material B as the flame-retardant layer 6A on the outer wall of the rubber layer 3A, and wrap the sheet-pressed material A as the fire-resistant layer 5A on the outer wall of the flame-retardant layer 6A.

[0068] Example 4:

[0069] A preparation method of a flame-retardant and fire-resistant wire and cable, as Figures 2-6 shown, the stirring mechanism includes a stirring cylinder 1, an air cylinder 11 and a rotating rod 14. The rotating rod 14 is rotatably connected to the inner wall of the through hole opened at the top of the stirring cylinder 1, and a support leg 2 is welded to the side wall of the stirring cylinder 1. The air cylinder 11 is welded to the bottom of the rotating rod 14. A piston rod 22 is slidably connected to the inner wall of the through hole opened at the bottom of the air cylinder 11. The top of the piston rod 22 is welded with a piston plate 23, and a first spring 21 is clamped between the top of the piston plate 23 and the inner wall of the top of the air cylinder 11. A support 19 is welded to the circumferential outer wall of the air cylinder 11, and an adjusting rod 13 is rotatably connected to the inner wall of the support 19. The bottom of the piston rod 22 is welded with a disc seat 29, and a stirring rod 10 is rotatably connected to the inner wall of the disc seat 29. The stirring rod 10 and the adjusting rod 13 are rotatably connected;

[0070] The mixing drum 1 can be used to store the preparation raw materials. When it is necessary to mix the preparation raw materials, when the rotating rod 14 is driven to rotate, the adjusting rod 13 and the mixing rod 10 stir and mix the preparation raw materials during rotation. By slidingly connecting the piston rod 22 and the air cylinder 11, when the piston rod 22 slides relative to the air cylinder 11, the angle between the adjusting rod 13 and the mixing rod 10 can be adjusted within a certain range, and then the mixing range of the adjusting rod 13 and the mixing rod 10 can be adjusted to a certain extent, so as to ensure the uniformity when mixing the preparation raw materials.

[0071] Furthermore, an L-shaped plate 8 is fixed to the outer wall of the top of the mixing drum 1 by bolts, and a driving motor 3 is fixed to the outer wall of the top of the L-shaped plate 8 by bolts. Belt pulleys are fixed to the outer circumferential wall of the output end of the driving motor 3 and the rotating rod 14 by screws, and the two belt pulleys are driven by a synchronous belt.

[0072] The driving motor 3 drives the rotating rod 14 to rotate by the driving action of the belt pulley and the synchronous belt. During the rotation of the rotating rod 14, the mixing rod 10 and the adjusting rod 13 are driven to rotate to mix the preparation raw materials.

[0073] Furthermore, a vertical plate 7 is fixed to the outer wall of the top of the mixing drum 1 by bolts, and a receiving shell 15 is welded to the outer wall of one side of the vertical plate 7. An expansion air bag 24 is adhered to the inner wall of one side of the receiving shell 15, and a stainless steel pipe 6 is welded to the outer wall of one side of the receiving shell 15. The stainless steel pipe 6 is fixedly connected to the expansion air bag 24. One end of the stainless steel pipe 6 is fixed with a rotary joint 20, and the rotary joint 20 is rotatably connected to the rotating rod 14.

[0074] When the expansion air bag 24 is squeezed, the gas inside it is introduced into the rotary joint 20 through the stainless steel pipe 6, and finally introduced into the air cylinder 11 through the rotary joint 20. After the gas enters the air cylinder 11, it pushes the piston plate 23, so that the piston rod 22 slides along the air cylinder 11, thereby realizing the angle adjustment between the mixing rod 10 and the adjusting rod 13. When the expansion air bag 24 is no longer squeezed, the piston rod 22 is reset under the restoring force of the first spring 21, and then the piston rod 22 slides intermittently and reciprocally along the air cylinder 11, so that the relative angle between the mixing rod 10 and the adjusting rod 13 changes alternately, ensuring the uniformity when mixing the preparation raw materials.

[0075] Further, a lining plate 16 is fixed to the outer wall of the top of the mixing drum 1 by bolts, and a through hole formed in the surface of the lining plate 16 is slidably connected with an extrusion rod 26. One end of the extrusion rod 26 is welded with a U-shaped frame 27, and a roller 28 is rotatably connected to the inner wall of the U-shaped frame 27. A second spring 25 is sleeved on the outer wall of the extrusion rod 26, and both ends of the second spring 25 are respectively clamped to the outer wall of one side of the lining plate 16 and the inner wall of one side of the extrusion rod 26. A cam 12 for cooperating with the roller 28 is fixed to the outer circumference of the rotating rod 14 by screws;

[0076] During the rotation of the rotating rod 14, the cam 12 is driven to rotate synchronously. After the cam 12 rotates, the roller 28 is intermittently extruded. After the roller 28 receives the pressure, the extrusion rod 26 is driven to extrude the expansion airbag 24, so that the gas inside the expansion airbag 24 is introduced into the air cylinder 11 through the stainless steel pipe 6 after being extruded, causing the angle between the stirring rod 10 and the adjusting rod 13 to change, thereby realizing the mixing and stirring of the preparation raw materials.

[0077] More preferably, a feeding pipe 5 is fixed to the outer wall of the top of the mixing drum 1 by bolts, and a conical feeding cylinder 4 is welded to one end of the feeding pipe 5;

[0078] By providing the conical feeding cylinder 4 and the feeding pipe 5, the preparation raw materials can be introduced into the mixing drum 1 for mixing.

[0079] A discharging valve 9 is fixed to the bottom of the mixing drum 1 by bolts;

[0080] After the preparation raw materials are mixed, the discharging valve 9 is opened to discharge the mixed preparation raw materials.

[0081] On the basis of the foregoing solution, a driving rod 17 is fixed to the top of the piston plate 23 by bolts, and an anti-blocking ring 18 adapted to the inner diameter of the conical feeding cylinder 4 is welded to the top of the driving rod 17;

[0082] By fixedly connecting the driving rod 17 and the piston plate 23, the anti-blocking ring 18 can rotate relative to the inner wall of the conical feeding cylinder 4 while moving up and down along the vertical direction itself. The purpose of this move is to effectively break the lumps in the preparation raw materials, thereby preventing the lumps from blocking the conical feeding cylinder 4 and ensuring that the preparation raw materials after being broken smoothly enter the mixing drum 1 through the feeding pipe 5 for mixing.

[0083] In this embodiment, when it is necessary to stir the preparation raw materials, the preparation raw materials are introduced into the stirring cylinder 1 through the conical feeding cylinder 4 and the feeding pipe 5 for feeding. Then, the driving motor 3 is started, and the driving motor 3 is used to drive the stirring rod 10 and the adjusting rod 13 to rotate. During the rotation of the stirring rod 10 and the adjusting rod 13, the preparation raw materials are stirred and mixed. During the rotation of the cam 12, the roller 28 is intermittently squeezed, so that the extrusion rod 26 presses the expansion air bag 24 during the movement. After the expansion air bag 24 is squeezed, the gas inside it is introduced into the air cylinder 11 through the stainless steel pipe 6, and then the gas is used to drive the piston rod 22 to move to adjust the relative angle between the stirring rod 10 and the adjusting rod 13, thereby increasing the stirring range of the preparation raw materials. At the same time, the anti-blocking ring 18 moves up and down inside the conical feeding cylinder 4 under the drive of the drive rod 17 and can also rotate itself, thereby playing a role in dredging the conical feeding cylinder 4 and preventing the preparation raw materials from being blocked during the feeding process.

[0084] Example 5:

[0085] In order to detect the flame retardancy and fire resistance performance of the cable, a comparative example is introduced on the basis of Examples 1-3. The specific detection steps are as follows;

[0086] 1: Take 20 cm of the cable rotary joints prepared in Examples 1-3, and the comparative example uses commercially available electric wires and cables, with the same length of 20 cm;

[0087] 2: Burn it with a blowtorch at a combustion temperature of 150 °C for 2 minutes;

[0088] 3: After the combustion is completed, observe the remaining amounts of the refractory layer 5A and the flame retardant layer 6A, and set the judgment criteria for flame retardancy and fire resistance as three ratings: excellent, good, and poor;

[0089] The test results are shown in Table 1:

[0090] Flame retardancy and fire resistance Example 1 Example 2 Example 3 Comparative example / Excellent Good Good Poor

[0091] Table 1

[0092] As can be seen from Table 1, the cables prepared in Examples 1-3 have a significant improvement in flame retardancy and fire resistance performance compared with the cables of the comparative example.

[0093] The above is the preferred specific embodiment of the present invention. The protection scope of the present invention is not limited thereto. Any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope disclosed by the present invention in combination with the prior art or common knowledge, within the spirit and principle of the present invention, shall be covered by the protection scope of the present invention.

Claims

1. A flame retardant and fire resistant wire and cable, comprising a core wire body (1A) and a protective portion fixed to the outer wall of the core wire body (1A), characterized in that: The protective part comprises a shielding layer (2A) and a composite insulating layer (7A), wherein the shielding layer (2A) is wrapped around the outer wall of the core wire body (1A), and the composite insulating layer (7A) is sleeved on the outer wall of the shielding layer (2A), and the protective part further comprises a rubber layer (3A) and a flame retardant layer (6A), wherein the rubber layer (3A) is sleeved on the outer wall of the composite insulating layer (7A), and the fire resistant layer (5A) is sleeved on the outer wall of the fire retardant layer (6A), and the outer layer of the fire resistant layer (5A) is wrapped with an outer coating layer (4A).

2. The flame-retardant and fire-resistant wire and cable according to claim 1, characterized in that: The fireproof layer (5A) comprises the following components in parts by weight: 2-5 parts of magnesium hydroxide; 1-2.5 parts of aluminum hydroxide; 2-3 parts of coupling agent, 90-100 parts of chloroprene rubber; 2-3 parts of stearic acid; 1-3 parts of expanded graphite; 4-5 parts of nickel oxide; 5-8 parts of polypropylene fiber; 8-10 parts of plasticizer; 3-6 parts of stabilizer; 2-5 parts of sodium carboxymethyl cellulose; 0.5-1 part of colorant; The flame retardant layer (6A) comprises 7-9 parts of anti-aging masterbatch and 80-98 parts of butadiene rubber by weight; 85-97 parts of nitrile rubber; 5-7 parts of lubricant; 0.2-0.5 parts of coupling agent; 6-9 parts of calcium carbonate.

3. A method for preparing a flame retardant and fire resistant wire and cable, used for preparing the flame retardant and fire resistant wire and cable according to any one of claims 1 to 2, characterized in that: The following steps are involved: (1): The fire-resistant layer (5A) and the flame-retardant layer (6A) are mixed separately according to the different raw materials for their preparation. When mixing the fire-resistant layer (5A), the raw materials are first introduced into a stirring mechanism for stirring. The stirring time is 10-15 minutes, and the speed during stirring is 100-120 r / min. After stirring, material A is formed; (2): When mixing the flame retardant layer (6A), the raw materials required for its preparation are introduced into a stirring mechanism for mixing and stirring. The stirring time is 15-20 minutes and the speed during stirring is 150-170 r / min. After stirring, material B is formed; (3): The prepared material A and material B are introduced into the open mill for open refining respectively. The open mill is a double-roller type. After the material A and material B are opened and blended, they are cut. The temperature range of the open refining is 150°C and the time of the open refining is 10-15 minutes. (4): The materials A and B after the opening are pressed into tablets at a temperature of 150-160°C for 5-8 minutes and a pressure of 14 MPa. (5): The material B after being pressed into a sheet is wrapped as a flame retardant layer (6A) on the outer wall of the rubber layer (3A), and the material A after being pressed into a sheet is wrapped as a fire-resistant layer (5A) on the outer wall of the flame retardant layer (6A).

4. The method for preparing a flame-retardant and fire-resistant wire and cable according to claim 3, characterized in that: The stirring mechanism comprises a stirring drum (1), an air cylinder (11) and a rotating rod (14); the rotating rod (14) is movably connected to the inner wall of a through hole opened at the top of the stirring drum (1); a supporting leg (2) is welded to the side wall of the stirring drum (1); the air cylinder (11) is welded to the bottom of the rotating rod (14); a piston rod (22) is movably connected to the inner wall of the through hole opened at the bottom of the air cylinder (11); a piston plate (23) is welded to the top of the piston rod (22); a spring (21) is clamped between the top of the piston plate (23) and the inner wall of the top of the air cylinder (11); a support (19) is welded to the outer wall of the circumference of the air cylinder (11); the inner wall of the support (19) is movably connected to the adjusting rod (13); a disc seat (29) is welded to the bottom of the piston rod (22); the inner wall of the disc seat (29) is movably connected to the stirring rod (10); the stirring rod (10) and the adjusting rod (13) are movably connected.

5. The method for preparing a flame-retardant and fire-resistant wire and cable according to claim 4, characterized in that: The top outer wall of the mixing drum (1) is fixed with an L-shaped plate (8) by bolts, and the top outer wall of the L-shaped plate (8) is fixed with a driving motor (3) by bolts, and the output end of the driving motor (3) and the circumferential outer wall of the rotating rod (14) are both fixed with pulleys by screws, and the two pulleys are driven by a synchronous belt.

6. The method for preparing a flame retardant and fire resistant wire and cable according to claim 5, characterized in that: A vertical plate (7) is fixed to the outer wall of the top of the mixing drum (1) by bolts, and a housing shell (15) is welded to the outer wall of one side of the vertical plate (7), an expansion airbag (24) is bonded to the inner wall of one side of the housing shell (15), and a stainless steel pipe (6) is welded to the outer wall of one side of the housing shell (15), and the stainless steel pipe (6) and the expansion airbag (24) are fixedly connected.

7. The method for preparing a flame-retardant and fire-resistant wire and cable according to claim 6, characterized in that: A rotary joint (20) is fixed to one end of the stainless steel pipe (6), and the rotary joint (20) and the rotary rod (14) are movably connected.

8. The method for preparing a flame-retardant and fire-resistant wire and cable according to claim 7, characterized in that: The top outer wall of the mixing drum (1) is fixed with a lining plate (16) by bolts, and a through hole provided on the surface of the lining plate (16) is movably connected with an extrusion rod (26), and a U-shaped frame (27) is welded to one end of the extrusion rod (26), and a roller (28) is movably connected to the inner wall of the U-shaped frame (27), and a spring 2 (25) is sleeved on the outer wall of the extrusion rod (26), and a cam (12) used in conjunction with the roller (28) is fixed to the circumferential outer wall of the rotating rod (14) by screws.

9. The method for preparing a flame-retardant and fire-resistant wire and cable according to claim 8, characterized in that: A driving rod (17) is fixed to the top of the piston plate (23) by bolts, and an anti-blocking ring (18) adapted to the inner diameter of the conical loading barrel (4) is welded to the top of the driving rod (17).

10. The method for preparing a flame-retardant and fire-resistant wire and cable according to claim 9, characterized in that: A feeding pipe (5) is fixed to the outer wall of the top of the mixing drum (1) by bolts, and a conical feeding barrel (4) is welded to one end of the feeding pipe (5). A discharge valve (9) is fixed to the bottom of the mixing drum (1) by bolts.

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