Aramid cord fabric continuous production line for aircraft tire

Abstract

The invention discloses a continuous production line for an aramid cord fabric of an aircraft tire, and belongs to the technical field of aramid cord fabric production. The surface of the aramid cord fabric is vertically and uniformly activated through a rotary nitrogen plasma torch to form a micro-nano rough structure, so that the permeation uniformity of RFL glue liquid is improved, and the yellow core defect of a traditional process is eliminated; a PLC intelligent linkage system of a magnetic stirrer and an ultrasonic vibrator is adopted, dynamic and stable control over the viscosity of the glue solution is achieved, and the problem of static gum dipping sedimentation layering is solved; a high-pressure spray gun driven by an electric guide rail is integrated in a drying oven to dynamically spray silane modified nano silicon dioxide suspension liquid, a three-layer composite structure composed of a closed isocyanate pretreatment layer, an RFL gum dipping layer and a nano-particle reinforcing layer is formed, nano-particles are embedded into fiber microcracks and extend outwards in a protruding mode, and the stripping strength of a cord fabric / rubber interface is improved; the product has a high strength retention rate at a brake high temperature of 300 DEG C, passes 500,000 times of dynamic impact tests, and meets the extreme requirements of the aircraft tire in the whole life cycle.

Description

Technical Field

[0001] This invention relates to the field of aramid cord fabric production technology, and in particular to a continuous production line for aramid cord fabric for aircraft tires. Background Technology

[0002] Aviation tire cord fabric needs to meet the requirements of high-strength adhesion and fatigue resistance under extreme operating conditions. Traditional aramid cord fabric production processes have significant limitations: First, conventional direct impregnation of activated fibers results in insufficient penetration depth and uniformity of RFL adhesive; second, the adhesive in the static impregnation tank is prone to stratification and sedimentation, causing insufficient adhesive application in parts of the cord fabric, resulting in a "yellow core" defect; third, existing coatings mostly use a single RFL adhesive layer or simply add fillers, making it difficult to achieve breakthroughs in interfacial peel strength, and rubber interface aging easily occurs under high-temperature environments, leading to interlayer debonding. Aviation tires need to withstand a cumulative 500,000 equivalent impact loads during their service life and resist instantaneous temperatures of 300°C under braking conditions. Existing technologies cannot simultaneously guarantee interfacial bonding strength and long-term durability.

[0003] Therefore, there is an urgent need to develop a continuous production line that integrates surface activation, adhesive homogenization control, and nano-reinforced coating. By using plasma modification, intelligent viscosity response system, and multi-layer composite structure to synergistically improve the performance of aramid cord fabric, it can meet the extreme service requirements of aircraft tires. Summary of the Invention

[0004] The purpose of this invention is to provide a continuous production line for aramid cord fabric for aircraft tires, thereby improving the quality of aramid cord fabric.

[0005] To achieve the above objectives, the present invention provides the following solution: A continuous production line for aramid cord fabric for aircraft tires includes a weaving assembly, a dipping assembly, a drying and setting assembly, a spraying assembly disposed within the drying and setting assembly, and a stretching assembly connected in sequence. The dipping assembly includes a dipping tank, a magnetic stirrer disposed within the dipping tank, and a plasma treatment unit disposed on a support and located upstream of the dipping tank. The plasma treatment unit includes at least two rotating bases disposed on the support and arranged opposite to each other, and a plasma spray gun disposed on the rotating base. The nozzle axis of the plasma spray gun is perpendicular to the plane of the cord fabric. The weaving assembly is used to weave the cord fabric. The drying and setting assembly is used to dry the dipping cord fabric while simultaneously performing dynamic spraying through the spraying assembly. The stretching assembly is used to stretch the sprayed cord fabric.

[0006] Preferably, the impregnation tank is a rectangular tank, the magnetic stirrer is embedded in the center of the bottom of the impregnation tank, ultrasonic transducers are symmetrically installed on both side walls of the impregnation tank, a circulation port is opened at the bottom of the impregnation tank, and a circulation pipe is connected through a flange. A filter screen is inclinedly installed in the circulation pipe, and the plane of the filter screen is inclined at an angle to the horizontal plane.

[0007] Preferably, the stirring rotor of the magnetic stirrer is covered with a polytetrafluoroethylene layer.

[0008] Preferably, a viscosity sensor is installed in the impregnation tank, and the viscosity sensor signal line is connected to a PLC controller; the output terminal of the PLC controller is connected to a magnetic stirring driver and an ultrasonic generator. When the viscosity is detected to exceed the predetermined range, the PLC synchronously starts the ultrasonic transducer and increases the magnetic stirring speed.

[0009] Preferably, a backflush nozzle is provided below the filter screen of the circulation pipe, and the backflush nozzle is connected to the compressed air pipe through a solenoid valve.

[0010] Preferably, the plasma spray gun is hinged to the rotating base via a universal joint, the locking bolt of the universal joint is used to adjust the pitch angle of the spray gun from 0 to 30°, and the rotating base is connected to a stepper motor with adjustable speed.

[0011] Preferably, the drying and shaping assembly includes an oven, and the spraying assembly includes an electric guide rail disposed at the top of the oven, a slider disposed on the guide rail, a telescopic cylinder disposed on the slider, and a high-pressure spray gun disposed at the telescopic end of the telescopic cylinder. The nozzle of the high-pressure spray gun points towards the conveying path of the curtain fabric and is used to spray a silane-modified nano-silica suspension.

[0012] Preferably, a temperature sensor and a heating element are provided on the side wall of the oven, and an outlet is provided at the bottom of the oven.

[0013] Preferably, the nozzle of the plasma spray gun is 10mm to 20mm away from the surface of the curtain fabric, and the air inlet of the plasma spray gun is connected to a nitrogen source through a hose.

[0014] Preferably, a drying and shaping component and a resin impregnation tank may be sequentially arranged between the resin impregnation component and the drying and shaping component.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention utilizes a rotary nitrogen plasma spray gun to vertically and uniformly activate the surface of aramid cord fabric, forming a micro-nano rough structure. This improves the uniformity of RFL adhesive penetration and eliminates the yellow core defect common in traditional processes. A PLC intelligent linkage system combining a magnetic stirrer and an ultrasonic transducer enables dynamic and stable control of the adhesive viscosity, overcoming the industry challenge of static impregnation sedimentation and stratification. An electrically driven high-pressure spray gun is integrated within an oven to dynamically spray a silane-modified nano-silica suspension, forming a three-layer composite structure consisting of a sealed isocyanate pretreatment layer, an RFL impregnation layer, and a nanoparticle reinforcement layer. The nanoparticles are embedded in fiber micro-cracks and extend outwards, enhancing the peel strength of the cord / rubber interface. This synergistic design enables the product to maintain high strength retention at 300°C braking temperatures and passes 500,000 dynamic impact tests, meeting the extreme service requirements throughout the entire life cycle of aviation tires. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall layout of the production line of the present invention; Figure 2 This is a schematic diagram of the plasma processing unit structure; Figure 3 This is a schematic diagram of the internal structure of the impregnation tank; Figure 4 This is a schematic diagram of the oven spraying mechanism. Figure 5 A schematic diagram of the coating structure of aramid cord fabric; Figure 6 This is a block diagram of the intelligent control system. The components include: 1. Weaving assembly; 2. Impregnation assembly; 3. Drying and setting assembly; 4. Drying and setting assembly + spraying assembly; 5. Stretching assembly; 100. Plasma treatment unit; 101. Plasma generator; 102. Plasma spray gun; 103. Fixed plate; 104. Telescopic component; 105. Sliding guide rail; 106. Rotating base; 107. Motor; 200, Impregnation tank; 201, Magnetic stirrer; 202, Ultrasonic transducer; 203, Viscosity sensor; 204, PLC; 205, Circulation pipe; 206, Screen; 207, Backflush nozzle; 208, Solenoid valve; 401, Electric guide rail; 402, Guide rail slider; 403, Telescopic cylinder; 404, High-pressure spray gun; 405, Heating element; 406, Temperature sensor; 500, Spraying device; 600, Outlet; 700, Tension clamp; 80, Base layer; 81, Pretreatment layer; 82, RFL impregnation layer; 83, Nano silica reinforcing layer. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a continuous production line for aramid cord fabric for aircraft tires, thereby improving the quality of aramid cord fabric.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] refer to Figures 1 to 4A continuous production line for aramid cord fabric for aircraft tires includes a weaving assembly 1, an impregnation assembly 2, a drying and setting assembly 3, a spraying assembly 500 disposed within the drying and setting assembly 3, and a stretching assembly 5, connected in sequence. The impregnation assembly 2 includes an impregnation tank 200, a magnetic stirrer 201 disposed within the impregnation tank 200, and a plasma treatment unit 100 disposed on a support and located upstream of the impregnation tank 200. The plasma treatment unit 100 includes at least two rotating bases 106 disposed on the support and arranged opposite to each other, and a plasma spray gun 102 disposed on the rotating bases 106. The nozzle axis of the plasma spray gun 102 is perpendicular to the plane of the cord fabric. The weaving assembly 1 is used to weave the cord fabric. The drying and setting assembly 3 is used to dry the impregnated cord fabric while simultaneously performing dynamic spraying through the spraying assembly 500. The stretching assembly 5 is used to stretch the sprayed cord fabric. This invention utilizes a rotary... Nitrogen plasma spray gun 102 vertically and uniformly activates the surface of aramid cord fabric, forming a micro-nano rough structure, which improves the uniformity of RFL adhesive penetration and eliminates the yellow core defect of traditional processes. A PLC204 intelligent linkage system using magnetic stirrer 201 and ultrasonic transducer 202 achieves dynamic and stable control of adhesive viscosity, overcoming the industry problem of static impregnation sedimentation and stratification. A high-pressure spray gun 404 driven by electric guide rail 401 is integrated in the oven to dynamically spray silane-modified nano-silica suspension, forming a three-layer composite structure consisting of a closed isocyanate pretreatment layer 81, an RFL impregnation layer 82, and a nanoparticle reinforcement layer. The nanoparticles are embedded in the fiber micro-cracks and extend outward, which improves the peel strength of the cord / rubber interface. This synergistic design enables the product to have a high strength retention rate under the high temperature of 300℃ braking and has passed 500,000 dynamic impact tests, meeting the extreme service requirements of the entire life cycle of aviation tires.

[0022] refer to Figure 2 The plasma spray gun 102 is connected to the plasma generator 101. A fixed plate 103 is connected below the plasma spray gun 102. A telescopic component 104 is provided below the fixed plate 103. A sliding guide rail 105 is provided at the bottom of the telescopic component 105.

[0023] refer to Figure 4 The electric guide rail 401 is equipped with a guide rail slider 402, the guide rail slider 402 is equipped with a telescopic cylinder 403, and the high-pressure spray gun 404 is mounted on the telescopic cylinder.

[0024] refer to Figure 1 The tensioning assembly 5 is equipped with a tensioning clamp 700.

[0025] refer to Figure 3The impregnation tank 200 is a rectangular tank. A magnetic stirrer 201 is embedded in the center of the bottom of the impregnation tank 200. Ultrasonic transducers 202 are symmetrically installed on both sides of the impregnation tank 200. A circulation port is opened at the bottom of the impregnation tank 200 and a circulation pipe 205 is connected through a flange. A filter screen 206 is inclinedly installed in the circulation pipe 205, and the plane of the filter screen 206 is inclined at an angle to the horizontal plane.

[0026] Furthermore, the stirring rotor of the magnetic stirrer 201 is covered with a polytetrafluoroethylene layer.

[0027] refer to Figure 3 and Figure 6 A viscosity sensor 203 is installed in the impregnation tank 200, and the signal line of the viscosity sensor 203 is connected to the PLC 204 controller. The output of the PLC 204 controller is connected to the magnetic stirring driver and the ultrasonic generator. When the viscosity is detected to be outside the predetermined range, the PLC 204 synchronously starts the ultrasonic transducer 202 and increases the magnetic stirring speed.

[0028] refer to Figure 3 A backwash nozzle 207 is installed below the filter screen 206 of the circulation pipe 205. The backwash nozzle 207 is connected to the compressed air pipe through a solenoid valve 208. The solenoid valve 208 is controlled by a timer, which sets a fixed time to start backwashing. The backwashing time is adjustable.

[0029] refer to Figure 2 The plasma spray gun 102 is hinged to the rotating base 106 via a universal joint. The locking bolt of the universal joint is used to adjust the pitch angle of the spray gun from 0 to 30°. The rotating base 106 is connected to a stepper motor 107 with adjustable speed.

[0030] refer to Figure 4 The drying and shaping component 3 includes an oven, and the spraying component 500 includes an electric guide rail 401 disposed at the top of the oven, a slider disposed on the guide rail, a telescopic cylinder disposed on the slider, and a high-pressure spray gun 404 disposed at the telescopic end of the telescopic cylinder. The nozzle of the high-pressure spray gun 404 points towards the conveying path of the curtain fabric and is used to spray a silane-modified nano-silica suspension.

[0031] refer to Figure 4 The oven has a temperature sensor 406 and a heating element 405 installed on its side wall, and an outlet 600 installed at the bottom of the oven.

[0032] Furthermore, the nozzle of the plasma spray gun 102 is 10mm to 20mm away from the surface of the curtain fabric, and the air inlet of the plasma spray gun 102 is connected to a nitrogen source through a hose.

[0033] refer to Figure 1 The drying and shaping component 3 and the dipping tank 200 can also be sequentially arranged between the dipping component 2 and the drying and shaping component 3.

[0034] The working principle of this invention is as follows: This production line achieves the preparation of high-performance aramid-impregnated tire cord fabric through a continuous process of plasma surface activation, intelligent impregnation, dynamic spraying, and structural forming. The invention sequentially comprises a weaving assembly 1, an impregnation assembly 2, a drying and setting assembly 3, a stretching assembly 5, and a spraying assembly 500. The aramid tire cord fabric produced by the weaving assembly 1 enters the impregnation assembly 2, where it first undergoes nitrogen plasma vertical surface treatment via a rotating spray gun in the plasma treatment unit 100 to activate the fiber surface. Subsequently, it enters the impregnation tank 200, where a magnetic stirrer 201 and an ultrasonic transducer 202 work in conjunction with signals from a viscosity sensor 203 to maintain a homogeneous state of the adhesive solution, ensuring full penetration of the RFL adhesive. In the drying and shaping component 3, while the impregnated cord fabric is drying in the oven, the high-pressure spray gun 404 is dynamically sprayed by the telescopic cylinder driven by the electric guide rail 401, so that the silane-modified nano silica suspension builds a three-layer composite coating on the surface of the cord fabric: the closed isocyanate pretreatment layer 81 is combined with the fiber, the RFL impregnation layer 82 forms a continuous coating, and the nanoparticles are embedded in the micro-cracks of the fiber and protrude to the outside of the reinforcing layer to enhance the interface anchoring, and finally a high-adhesion-strength finished product is output.

[0035] refer to Figure 5 The aramid cord fabric is produced by the production line described in the above embodiment. Its surface has a high-adhesion coating and includes, from the inside to the outside, the following layers from the aramid fiber matrix: a base layer 80, a closed isocyanate pretreatment layer 81 composed of aromatic closed isocyanates; an RFL impregnation layer 82; and a nano-silica reinforcing layer 83 containing nano-silica particles modified with silane coupling agents. The nano-silica particles are partially embedded in the micro-cracks on the surface of the aramid fiber, and some particles protrude and extend to the outside of the reinforcing layer.

[0036] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A continuous production line for aramid cord fabric for aircraft tires, characterized in that, The device includes a weaving assembly, a resin impregnation assembly, a drying and setting assembly, a spraying assembly disposed within the drying and setting assembly, and a stretching assembly connected in sequence. The resin impregnation assembly includes a resin impregnation tank, a magnetic stirrer disposed within the resin impregnation tank, and a plasma treatment unit disposed on a support and located upstream of the resin impregnation tank. The plasma treatment unit includes at least two rotating bases disposed on the support and arranged opposite to each other, and a plasma spray gun disposed on the rotating base. The nozzle axis of the plasma spray gun is perpendicular to the plane of the curtain fabric. The weaving assembly is used to weave the curtain fabric. The drying and setting assembly is used to dry the resin-impregnated curtain fabric while simultaneously performing dynamic spraying through the spraying assembly. The stretching assembly is used to stretch the sprayed curtain fabric.

2. The continuous production line for aramid cord fabric for aircraft tires according to claim 1, characterized in that, The impregnation tank is a rectangular tank. The magnetic stirrer is embedded in the center of the bottom of the impregnation tank. Ultrasonic transducers are symmetrically installed on both sides of the impregnation tank. A circulation port is opened at the bottom of the impregnation tank and a circulation pipe is connected through a flange. A filter screen is installed at an angle inside the circulation pipe, and the plane of the filter screen is at an angle to the horizontal plane.

3. The continuous production line for aramid cord fabric for aircraft tires according to claim 2, characterized in that, The stirring rotor of the magnetic stirrer is covered with a polytetrafluoroethylene layer.

4. The continuous production line for aramid cord fabric for aircraft tires according to claim 2, characterized in that, A viscosity sensor is installed in the impregnation tank, and the signal line of the viscosity sensor is connected to the PLC controller. The output of the PLC controller is connected to the magnetic stirring driver and the ultrasonic generator. When the viscosity is detected to be outside the predetermined range, the PLC synchronously starts the ultrasonic transducer and increases the magnetic stirring speed.

5. The continuous production line for aramid cord fabric for aircraft tires according to claim 2, characterized in that, A backflush nozzle is installed below the filter screen of the circulation pipeline, and the backflush nozzle is connected to the compressed air pipe through a solenoid valve.

6. The continuous production line for aramid cord fabric for aircraft tires according to claim 1, characterized in that, The plasma spray gun is hinged to the rotating base via a universal joint. The locking bolt of the universal joint is used to adjust the pitch angle of the spray gun from 0 to 30°. The rotating base is connected to a stepper motor with adjustable speed.

7. The continuous production line for aramid cord fabric for aircraft tires according to claim 1, characterized in that, The drying and shaping assembly includes an oven, and the spraying assembly includes an electric guide rail disposed at the top of the oven, a slider disposed on the guide rail, a telescopic cylinder disposed on the slider, and a high-pressure spray gun disposed at the telescopic end of the telescopic cylinder. The nozzle of the high-pressure spray gun points to the conveying path of the curtain fabric and is used to spray a silane-modified nano-silica suspension.

8. The continuous production line for aramid cord fabric for aircraft tires according to claim 7, characterized in that, Temperature sensors and heating elements are installed on the side walls of the oven, and an outlet is provided at the bottom of the oven.

9. The continuous production line for aramid cord fabric for aircraft tires according to claim 1, characterized in that, The nozzle of the plasma spray gun is 10mm to 20mm away from the surface of the curtain fabric, and the air inlet of the plasma spray gun is connected to a nitrogen source through a hose.

10. The continuous production line for aramid cord fabric for aircraft tires according to claim 1, characterized in that, A drying and shaping component and a resin impregnation tank may also be sequentially arranged between the resin impregnation component and the drying and shaping component.

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