Physicochemical modified flame-retardant halogen-free cable sheath material production equipment and method

Abstract

The invention relates to the technical field of cable sheaths, in particular to physico-chemical modified flame-retardant halogen-free cable sheath material production equipment and method. The liquid stirring device comprises a shell, a motor, a stirring assembly and a liquid discharging assembly. The stirring assembly comprises a stirring shaft connected with the output end of the motor, and an eccentric wheel, a first stirring blade, a second stirring blade and a third stirring blade which are sequentially mounted on the stirring shaft from top to bottom; the liquid discharging assembly comprises a first telescopic rod, one end of the first telescopic rod abuts against the eccentric wheel, an atomization nozzle is hinged to the first telescopic rod, the other end of the first telescopic rod is connected with a bag body, and the air outlet end of the bag body communicates with a cleaning part. The eccentric wheel is driven to rotate in the stirring process, so that the atomizing spray head is driven to swing, the spraying range of the atomizing spray head is expanded, and the mixing effect is favorably improved.

Description

Technical Field

[0001] The invention relates to the technical field of cable sheaths, and in particular to a production device and method for a physicochemically modified flame-retardant halogen-free cable sheath material. Background Art

[0002] Physical and chemical modified flame retardant halogen-free cable sheath material is a cable outer layer protective material made based on halogen-free flame retardant materials by combining physical and chemical modification technology. Its core lies in optimizing material formula and production process to achieve high flame retardancy, low smoke and non-toxicity, environmental protection and safety, while taking into account mechanical strength and processing performance.

[0003] The invention with application number CN202410832463.8 relates to the technical field of cable sheath production, and specifically discloses a production process for physicochemically modified flame-retardant halogen-free cable sheath materials, including preheating and mixing treatment, extrusion treatment, cooling treatment and surface polishing treatment of raw materials. The cable sheath tubular material is subjected to heat exchange treatment by a heat exchange component. As the cable sheath tubular material is slowly transported inside the cooling rack, the heat exchange component rotates on the surface of the cable sheath tubular material to complete efficient cooling treatment of the cable sheath tubular material. Finally, the surface treatment mechanism provided on the right side of the cooling rack is used to perform a comprehensive polishing treatment on the surface of the cooled cable sheath tubular material to improve the smoothness and flatness of the surface of the cable sheath tubular material, thereby ensuring the quality of subsequent coating processing on the surface of the cable sheath tubular material.

[0004] However, this patent directly puts the solid materials and liquid materials into mixing, and due to the large difference in shape, during the simple mixing process, the liquid material may be difficult to evenly distribute in various parts of the solid material, which may easily lead to insufficient local mixing.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the invention

[0006] The object of the present invention is to provide a production equipment for a physicochemically modified flame-retardant halogen-free cable sheath material which can effectively solve the above-mentioned technical problems.

[0007] In order to achieve the purpose of the present invention, the following technical scheme is adopted:

[0008] A physicochemically modified flame-retardant halogen-free cable sheath material production equipment, comprising: a housing, a motor, a stirring component, and a liquid feeding component;

[0009] The stirring assembly comprises: a stirring shaft connected to the output end of the motor, an eccentric wheel, a first stirring blade, a second stirring blade, and a third stirring blade sequentially installed on the stirring shaft from top to bottom;

[0010] The liquid feeding assembly comprises: a first telescopic rod, one end of which is in contact with the eccentric wheel, and an atomizing nozzle is hinged on the first telescopic rod, the other end of the first telescopic rod is connected to a capsule, and the air outlet end of the capsule is connected to a cleaning member.

[0011] Furthermore, the first telescopic rod is connected to a first connecting block, the first connecting block is hinged to a hinged rod, the hinged rod is hinged to a second connecting block, and the second connecting block is installed on the connecting pipeline of the atomizing nozzle.

[0012] Furthermore, the cleaning member is composed of at least a second telescopic rod and a cleaning brush rotatably connected to the second telescopic rod; and a plurality of fine holes are formed on the cleaning brush.

[0013] Furthermore, a material discharge chamber is also provided on the top of the shell, in which dispersion blades are rotatably installed; the dispersion blades are coaxially connected to a driven pulley; a driving pulley is connected to the output shaft of the motor, and the driving pulley is transmission-connected to a driving belt, and the driving belt is connected to the driven pulley.

[0014] Furthermore, there are multiple material discharge chambers, and each of the multiple material discharge chambers is provided with dispersion blades, each of the dispersion blades is coaxially connected to a driven pulley, and two adjacent driven pulleys are connected via a driven belt transmission.

[0015] Furthermore, a cleaning scraper is slidably mounted on the end of the first stirring blade, and the cleaning scraper is arranged at an inclination.

[0016] Furthermore, a return spring is arranged inside the capsule.

[0017] According to another aspect of the present invention, the present invention also relates to a method for producing a physicochemically modified flame retardant halogen-free cable sheath material, comprising:

[0018] S1, mixing nano magnesium hydroxide powder and silane coupling agent in an ethanol solution; oscillating the mixture in an ultrasonic reactor; drying the liquid in a centrifuge, and drying the mixture in a vacuum drying oven to obtain a dry modified flame retardant;

[0019] S2. Mix melamine cyanurate and boron nitride nanosheets, heat and pressurize in a high-pressure reactor to form a composite; and grind the composite into ultrafine powder using a ball mill.

[0020] S3, adding the plastic substrate, modified flame retardant, synergist, lubricant, initiator, antioxidant, and silane coupling agent ethanol solution into the shell in proportion to form a dough-like material;

[0021] S4, the mixed materials are sent to the twin-screw extruder, heated in sections, and the screws rotate at high speed to shear the materials; the extruder is vacuumed to discharge bubbles and small molecular impurities; under high temperature and high pressure, the flame retardant and the plastic form a strong bond through chemical reaction;

[0022] S5, the molten material is extruded from the extruder die into strips; the strips are cut into small particles by a water ring pelletizer with a rotating blade, and cold water is sprayed to cool and shape them;

[0023] S6. Place the particles into a fluidized bed and spray the fluorosilicone solution to form a waterproof layer on the surface of the particles.

[0024] Further, in step S3, at the initial stage of mixing, the speed is started at 100 to 150 rpm to initially mix the various solid materials; during the mixing process, the speed is gradually increased to 250 to 350 rpm; the silane coupling agent ethanol solution is added, and the speed is further increased to 350 to 400 rpm.

[0025] Compared with the prior art, the present invention has the following beneficial effects: in the process of mixing solid materials, the present invention atomizes the liquid material through the atomizing nozzle, and drives the eccentric wheel to rotate during the stirring process, thereby driving the atomizing nozzle to swing, thereby expanding the spraying range of the atomizing nozzle and helping to improve the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] Figure 1 This is a flow chart of a method for producing a physicochemically modified flame-retardant halogen-free cable sheath material according to the present invention.

[0028] Figure 2 A schematic structural diagram of a physicochemically modified flame-retardant halogen-free cable sheath material production device of the present invention;

[0029] Figure 3 It is a schematic axial view of a production equipment for a physicochemically modified flame-retardant halogen-free cable sheath material according to the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of a physicochemically modified flame-retardant halogen-free cable sheath material production device of the present invention;

[0031] Figure 5 It is a structural schematic diagram of a solid material blanking component of a physicochemically modified flame-retardant halogen-free cable sheath material production device of the present invention;

[0032] Figure 6 It is a schematic diagram of a solid material blanking component of a physicochemically modified flame-retardant halogen-free cable sheath material production device of the present invention;

[0033] Figure 7 It is a structural schematic diagram of a liquid feeding component of a physicochemically modified flame-retardant halogen-free cable sheath material production device of the present invention;

[0034] Figure 8 The present invention is a schematic diagram of the internal structure of a material unloading chamber of a physicochemically modified flame retardant halogen-free cable sheath material production device.

[0035] In the figure: 1. housing; 2. motor; 3. solid material discharge assembly; 31. discharge chamber; 32. driving pulley; 33. driven pulley; 34. driving belt; 35. driven belt; 36. dispersion blade; 4. liquid material discharge assembly; 41. air pump; 42. atomizing nozzle; 43. first telescopic rod; 431. outer sliding rod; 432. inner sliding rod; 44. connecting rod; 45. first connecting block; 46. second connecting block; 47. hinged rod; 48. capsule; 49. cleaning part; 491. second telescopic rod; 492. cleaning brush; 5. stirring assembly; 51. stirring shaft; 52. eccentric wheel; 53. first stirring blade; 54. second stirring blade; 55. third stirring blade; 56. cleaning scraper. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments.

[0037] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0038] like Figures 1 to 8 As shown, the present invention is a physicochemically modified flame retardant halogen-free cable sheath material production equipment, comprising:

[0039] The bottom of the shell 1 is provided with supporting legs for supporting the shell 1; the top of the shell 1 is provided with a cover body for carrying the components arranged on the cover body; a through hole is opened in the middle of the cover body, a motor 2 mounting seat is installed on the top of the cover body, and the motor 2 is installed on the motor 2 mounting seat, and the output end of the motor 2 extends into the interior of the shell 1 through the through hole.

[0040] A solid material discharge component 3 is arranged on the top of the shell 1, and the solid material discharge component 3 includes: a discharge chamber 31, which is composed of a shell installed on the top of the shell 1 and a discharge port installed on the top of the shell, and the discharge amount of the discharge port is controlled by a common electromagnetic valve; a connecting through hole is opened at the middle position of the top of the shell, and a dispersion blade 36 is rotatably connected in the connecting through hole, and a driven pulley 33 is coaxially connected to the top of the dispersion blade 36; a driving pulley 32 is connected to the output shaft of the motor 2, and the driving pulley 32 is transmission-connected to the driving belt 34, and the driving belt 34 is transmission-connected to one of the driven pulleys 33, and the driven pulley 33 can be set to multiple, and two adjacent driven pulleys 33 are transmission-connected through a driven belt 35; when the output shaft of the motor 2 rotates, the driving pulley 32 is driven to rotate, thereby driving the driven pulley 33 to rotate, and then driving the dispersion blade 36 to stir, and the dispersion blade 36 is used to stir the solid material in the discharge chamber 31, especially the powdered solid material, to break up the solid material and prevent the solid material from agglomerating.

[0041] A stirring assembly 5 is also provided inside the housing 1; the stirring assembly 5 comprises: a stirring shaft 51 which is coaxially connected to the output end of the motor 2, the stirring shaft 51 is located inside the housing 1, and plays a supporting and transmission role; an eccentric wheel 52, a first stirring blade 53, a second stirring blade 54, and a third stirring blade 55 are sequentially installed on the stirring shaft 51 from top to bottom; the eccentric wheel 52 is installed at a position where the output shaft of the motor 2 is close to the top of the housing, and is located above the material level in the mixing, and does not directly contact the material; the blades of the first stirring blade 53 are distributed in a ring shape around the stirring shaft 51, The stirring blade 53 is horizontally arranged, and the number of blades is at least three. Its shape and layout design enable it to generate a relatively wide radial stirring force in the upper area of ​​the material when the stirring shaft 51 rotates. The first stirring blade 53 can quickly disperse and mix the material put into the container at the initial stage of stirring, break the agglomerates that may be formed in the initial state of the material, and make different types of materials begin to contact and blend with each other. In addition, it can also push the material to the edge of the container through radial stirring force during the stirring process, promote the uniform distribution of the material in the horizontal direction, and lay the foundation for the further stirring work of other stirring blades in the subsequent process; a second stirring blade 54 is arranged below the first stirring blade 53, and the second stirring blade 54 is spirally shaped, which is used to receive the material preliminarily mixed after stirring by the first stirring blade 53, further refine and deepen the mixing, and turn the material up and down in the middle area through the spiral shape, so that the upper material and the lower material are better integrated; a third stirring blade 55 is arranged at the lower part of the second stirring blade 54, and the number of blades of the third stirring blade 55 is four, and the blade shape is a combination of an inclined blade type and a spiral shape of the second stirring blade 54. It can produce a complex and efficient stirring effect during the stirring process. The oblique-blade blade can make the material produce axial flow, and the spiral blade further enhances the axial and radial mixing effects. The third stirring blade 55 mainly acts on the lower area of ​​the material. The axial flow generated by the oblique-blade blade can push the material at the bottom upward and fully exchange it with the upper and middle materials, thereby improving the uniformity of material mixing, reducing mixing dead corners, and improving mixing efficiency. For modified flame retardants, this multi-layer circumferential stirring structure can ensure that fillers such as flame retardants are more evenly dispersed in the resin matrix.

[0042] A cleaning scraper 56 is slidably mounted at the end of the first stirring blade 53. The cleaning scraper 56 is tilted and shaped as an arc that fits tightly against the inner wall of the outer shell 1. A certain angle is formed between the cleaning scraper 56 and the inner wall of the outer shell 1. The cleaning scraper 56 is made of wear-resistant polyurethane rubber. During the mixing process, the cleaning scraper 56 rotates synchronously with the stirring shaft 51 to continuously clean the inner wall of the outer shell 1 to prevent the silane coupling agent ethanol solution and other materials from adhering to the inner wall. At the same time, the cleaning scraper 56 pushes the scraped material into the material being stirred for mixing, and pushes part of the material pushed to the edge of the outer shell 1 by the first stirring blade 53 into the material being stirred. The contact pressure between the cleaning scraper 56 and the inner wall of the outer shell 1 can be adjusted by a spring or an air pressure device to ensure the cleaning effect while avoiding damage to the inner wall.

[0043] The housing 1 is also provided with a liquid feeding assembly 4, and the liquid feeding assembly 4 is at least 3 groups, wherein each group of the liquid feeding assembly 4 comprises: a connecting rod 44 arranged at the bottom of the cover body of the housing 1, a tubular block is installed at the bottom of the connecting rod 44, and the tubular block is slidably connected to the first telescopic rod 43; the first telescopic rod 43 is composed of an inner sliding rod 432, an outer sliding rod 431 slidably connected to one end of the inner sliding rod 432, and a spring installed between the inner sliding rod 432 and the outer sliding rod 431, and the inner sliding rod 432 is slidably connected to the connecting rod 44; one end of the outer sliding rod 431 abuts against the eccentric wheel 52; the inner sliding rod 432 is also connected to a first connecting block 45, the first connecting block 45 is hinged to a hinged rod 47, the hinged rod 47 is hinged to a second connecting block 46, and the second connecting block 46 is installed on the connecting pipeline of the atomizing nozzle 42, and is used to drive the atomizing nozzle 42 to move ... The nozzle 42 swings; the connecting pipeline of the atomizing nozzle 42 is connected to the air pump 41; the air pump 41 is installed on the top of the cover body, which is used to enhance the injection pressure of the atomizing nozzle 42; the atomizing nozzle 42 is also connected to a liquid storage tank through a connecting pipeline, which is used to store the silane coupling agent ethanol solution and supply it to the atomizing nozzle 42; the other end of the inner sliding rod 432 is connected to a capsule 48, and the end of the capsule 48 away from the inner sliding rod 432 is arc-shaped, and the arc is adapted to the inner wall of the outer shell 1, which is convenient for installation on the outer shell 1. A reset spring is arranged inside the capsule 48, which is used to expand and reset the capsule 48 and move the first telescopic rod 43 toward the eccentric wheel 52; the air outlet end of the capsule 48 is connected to a cleaning member 49, and the cleaning member 49 is composed of at least a second telescopic rod 491 and a cleaning brush 492 rotatably connected to the second telescopic rod 491; a number of fine holes are opened on the cleaning brush 492.

[0044] During the rotation of the eccentric wheel 52, it contacts with each first telescopic rod 43 in turn, driving the first telescopic rod 43 to slide. During the sliding of the first telescopic rod 43, the first connecting block 45 is driven to slide. Since the connecting pipeline of the first connecting block 45 and the atomizing nozzle 42 is connected through the hinge rod 47, the first connecting block 45 drives the hinge rod 47 to move, thereby driving the second connecting block 46 to move, and then driving the atomizing nozzle 42 to swing; at the same time, the first telescopic rod 43 squeezes the capsule 48, and after the capsule 48 is squeezed, the gas inside moves along The air outlet is discharged to the cleaning member 49. When the atomizing nozzle 42 swings close to the housing 1, the nozzle contacts the cleaning brush 492. At this time, the atomizing nozzle 42 does not spray liquid. On the one hand, the nozzle is directly wiped and cleaned by the cleaning brush 492; on the other hand, the gas ejected from the fine holes can jet clean the nozzle. The silane coupling agent ethanol solution itself has a certain volatility. During the mixing process, some residues may form crystals or agglomerates at the nozzle, and the airflow ejected from the fine holes can impact and blow away these crystals to keep the nozzle unobstructed.

[0045] To ensure the strength of the air flow, the volume of the capsule 48 can be increased, or the air source can be connected. For example, a two-position three-way solenoid valve is set, and the air source is connected to the common air inlet of the solenoid valve, one air outlet of the solenoid valve is connected to the capsule 48, and the other air outlet is connected to the air supply pipe of the atomizing nozzle 42; when it is necessary to supply air to the atomizing nozzle 42, the air source is connected to the air outlet connected to the atomizing nozzle 42, and the gas supplies the atomizing nozzle 42; at the same time, the air outlet connected to the capsule 48 is closed, and the capsule 48 stops supplying air; when it is necessary to supply air to the capsule 48, the air source is connected to the air outlet connected to the capsule 48, and the gas flows to the capsule 48, while the air outlet connected to the atomizing nozzle 42 is in a closed state, and the atomizing nozzle 42 is not supplied with air; the time for switching the air outlet can be set manually, or a pressure sensor can be set inside the capsule 48, and when the pressure sensor is triggered, it switches to supplying air to the capsule 48.

[0046] The atomizing nozzle 42 is driven to swing by the eccentric wheel 52, so that the liquid material is sprayed more evenly on the material in the shell 1, avoiding excessive or low local concentration and improving the mixing effect; in view of the characteristics of the silane coupling agent ethanol solution, it is preferred to use a corrosion-resistant nozzle with good atomization effect, such as a ceramic atomizing nozzle 42, which can atomize the silane coupling agent ethanol solution into fine droplets (particle size ≤ 50μm) to ensure that it can be evenly dispersed in the solid material during the mixing process. In this embodiment, three nozzles are installed at appropriate positions on the top or side wall of the shell 1 to ensure that the spray coverage can evenly cover the material; the nozzle spacing is adjusted according to the size of the shell 1. For example, for a shell 1 with a diameter of 2 meters, the nozzle spacing is set to 80 to 100 cm.

[0047] A method for producing a physicochemically modified flame-retardant halogen-free cable sheath material comprises:

[0048] S1. Add 100 to 120 parts by weight of nano magnesium hydroxide powder and 1.5% of the mass of silane coupling agent to an ethanol solution at a solid-liquid ratio of 1:5. The ethanol solvent has volatilized in the subsequent drying process and is not included in the total formula; use an ultrasonic reactor (40kHz frequency, 60°C) to shake for 1 hour to evenly wrap the silane on the surface of the magnesium hydroxide (forming -Si-O-Mg- chemical bonds); use a centrifuge (6000rpm, 10 minutes) to dry the liquid, and then use a vacuum drying oven (80°C, 12 hours) to dry to obtain 101.5 to 121.8 parts by weight of a dried modified flame retardant;

[0049] S2. Mix 6 to 7.5 parts by weight of melamine cyanurate (MCA) and 2 to 2.5 parts by weight of boron nitride nanosheets (BNNS) (mass ratio 3:1), heat and pressurize in an autoclave (120°C, 0.5MPa) for 4 hours to form a composite; grind the composite into ultrafine powder (D50≤500nm) using a ball mill (300rpm, 6 hours).

[0050] S3. Put the plastic base material (EVA 60 to 70 parts by weight + POE-g-MAH 10 parts by weight), modified flame retardant (100 to 120 parts by weight), synergist (8 to 10 parts by weight), lubricant (zinc stearate 1 to 2 parts by weight + EBS 0.5 to 1 part by weight), initiator DCP 0.5 to 1 part by weight, and antioxidant 0.5 to 1 part by weight into the physical and chemical modified flame retardant halogen-free cable sheath material production equipment, pre-mix the physical and chemical modified flame retardant halogen-free cable sheath material production equipment at a speed of 150 to 200 rpm for 3 to 5 minutes to preliminarily disperse the solid materials, and increase the stirring speed to 300 to 350 rpm; open the nozzle and add 1 to 3 parts by weight of silane coupling agent ethanol solution to gradually spray through the physical and chemical modified flame retardant halogen-free cable sheath material production equipment, and continue stirring for 8 to 10 minutes; stir at a high speed at 90°C ± 1°C for 20 minutes to evenly mix all the materials to form a dough-like material.

[0051] At the beginning of mixing, start at a lower speed (such as 100 to 150rpm) to initially mix various solid materials (such as EVA, POE-g-MAH, modified flame retardant, etc.) to avoid splashing or local agglomeration of materials due to excessive speed. During the mixing process, gradually increase the speed to 250 to 350rpm to enhance the shear force and make the materials mix more fully, especially for the addition of liquid materials (such as silane coupling agent ethanol solution), high-speed stirring can promote the uniform distribution of liquid materials in solid materials; use a peristaltic pump or a metering pump to accurately control the flow rate of the silane coupling agent ethanol solution according to the proportion requirements in the formula.

[0052] Before adding the solution, the stirring speed is 250 to 350 rpm, and after adding, the speed is increased to 350 to 400 rpm, and the stirring is continued for 5 to 8 minutes to allow the silane coupling agent ethanol solution to fully contact and mix with the solid material. At the same time, combined with the design of the multi-layer circumferential stirring blades in the housing 1, the shear force and convection effect are enhanced to promote the uniform dispersion of the coupling agent in the material, ensure that it fully reacts with the modified flame retardant, resin, etc., and improve the interface bonding force.

[0053] S4. The mixed materials are fed into a twin-screw extruder and heated in sections (140°C in the first zone → 190°C in the die head). The screw rotates at high speed (400rpm) to shear the materials. The extruder is vacuumed (-0.08MPa) to discharge bubbles and small molecular impurities. Under high temperature and high pressure, the flame retardant and the plastic form a strong bond through chemical reaction (0.5 to 1 part by weight of DCP induces free radical grafting).

[0054] S5. The molten material is extruded into strips from the extruder die (aperture φ2 mm); immediately passed through a water ring pelletizer (blade 2500 rpm, water temperature 20°C), and the strips are cut into small particles (diameter 2±0.1 mm) by a rotating blade, and simultaneously cooled and shaped by cold water spraying (cooling rate ≥50°C / min).

[0055] S6, put the particles into the fluidized bed (air flow velocity 1.5m 3 / min), spray fluorosilicone solution (0.5% FAS-17 ethanol solution, spraying amount 3 to 5 ml / kg); heat to 60°C (hot air circulation) to form a waterproof layer on the surface of the particles (contact angle ≥130°, water resistance grade IPX8).

[0056] S7. The formed particles are randomly inspected, including: using a laser particle size analyzer to check whether the particle diameter is uniform (D50 = 2 ± 0.1 mm); using an electron microscope to observe whether the flame retardant is evenly dispersed (no agglomerates > 5 μm); using a contact angle tester (JC2000D) to measure the water resistance (≥130° is qualified).

[0057] S8. Put the qualified particles into aluminum-plastic moisture-proof bags and vacuum seal them.

[0058] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0059] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A production equipment for physicochemically modified flame retardant halogen-free cable sheath material, characterized in that: include: Housing, motor, stirring assembly, liquid feeding assembly; The stirring assembly comprises: a stirring shaft connected to the output end of the motor, an eccentric wheel, a first stirring blade, a second stirring blade, and a third stirring blade sequentially installed on the stirring shaft from top to bottom; The liquid feeding assembly comprises: a first telescopic rod, one end of which is in contact with the eccentric wheel, and an atomizing nozzle is hinged on the first telescopic rod, the other end of the first telescopic rod is connected to a capsule, and the air outlet end of the capsule is connected to a cleaning member.

2. The production equipment of the physicochemically modified flame-retardant halogen-free cable sheath material according to claim 1, characterized in that: The first telescopic rod is connected to a first connecting block, the first connecting block is hinged to a hinged rod, the hinged rod is hinged to a second connecting block, and the second connecting block is installed on a connecting pipeline of the atomizing nozzle.

3. The production equipment of the physicochemically modified flame-retardant halogen-free cable sheath material according to claim 1, characterized in that: The cleaning member is composed of at least a second telescopic rod and a cleaning brush rotatably connected to the second telescopic rod; a plurality of fine holes are formed on the cleaning brush.

4. The production equipment of the physicochemically modified flame retardant halogen-free cable sheath material according to claim 1, characterized in that: The top of the shell is also provided with a material discharge chamber, in which a dispersion blade is rotatably installed; the dispersion blade is coaxially connected with a driven pulley; the output shaft of the motor is connected with a driving pulley, and the driving pulley is transmission-connected with a driving belt, and the driving belt is connected with the driven pulley.

5. The production equipment of the physicochemically modified flame retardant halogen-free cable sheath material according to claim 4, characterized in that: There are multiple material discharge chambers, and each of the multiple material discharge chambers is provided with dispersion blades, each of the dispersion blades is coaxially connected to a driven pulley, and two adjacent driven pulleys are connected via a driven belt transmission.

6. The production equipment of the physicochemically modified flame retardant halogen-free cable sheath material according to claim 1, characterized in that: A cleaning scraper is slidably mounted on the end of the first stirring blade, and the cleaning scraper is inclined.

7. The production equipment of the physicochemically modified flame retardant halogen-free cable sheath material according to claim 1, characterized in that: A return spring is arranged inside the capsule.

8. The production equipment of the physicochemically modified flame retardant halogen-free cable sheath material according to claim 1, characterized in that: The blades of the first stirring blade are distributed in a ring shape around the stirring shaft and are arranged horizontally; the second stirring blade is spiral-shaped; and the blade shape of the third stirring blade is an inclined blade type.

9. A method for producing a physicochemically modified flame retardant halogen-free cable sheath material, applied to a physicochemically modified flame retardant halogen-free cable sheath material production device as claimed in any one of claims 1 to 8, characterized in that: include: S1, mixing nano magnesium hydroxide powder and silane coupling agent in an ethanol solution; shaking in an ultrasonic reactor; The liquid is dried by a centrifuge, and then dried in a vacuum drying oven to obtain a dry modified flame retardant; S2, mixing melamine cyanurate with boron nitride nanosheets, heating and pressurizing in a high-pressure reactor to form a composite; grinding the composite into ultrafine powder using a ball mill; S3, adding the plastic substrate, modified flame retardant, synergist, lubricant, initiator, antioxidant, and silane coupling agent ethanol solution into the shell in proportion to form a dough-like material; S4, the mixed materials are sent to the twin-screw extruder, heated in sections, and the screws rotate at high speed to shear the materials; the extruder is vacuumed to discharge bubbles and small molecular impurities; under high temperature and high pressure, the flame retardant and the plastic form a strong bond through chemical reaction; S5, the molten material is extruded from the extruder die into strips; the strips are cut into small particles by a water ring pelletizer with a rotating blade, and cold water is sprayed to cool and shape them; S6. Place the particles into a fluidized bed and spray the fluorosilicone solution to form a waterproof layer on the surface of the particles.

10. The method for producing a physicochemically modified flame-retardant halogen-free cable sheath material according to claim 9, characterized in that: In step S3, at the initial stage of mixing, the speed is started at 100 to 150 rpm to preliminarily mix various solid materials; during the mixing process, the speed is gradually increased to 250 to 350 rpm; the silane coupling agent ethanol solution is added, and the speed is further increased to 350 to 400 rpm.

Images