CN112458597A - Aramid fabric, preparation method thereof and aramid fiber conveying belt - Google Patents
Aramid fabric, preparation method thereof and aramid fiber conveying belt Download PDFInfo
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- CN112458597A CN112458597A CN202011399574.2A CN202011399574A CN112458597A CN 112458597 A CN112458597 A CN 112458597A CN 202011399574 A CN202011399574 A CN 202011399574A CN 112458597 A CN112458597 A CN 112458597A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
- D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
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- Belt Conveyors (AREA)
Abstract
The invention provides aramid cloth, which comprises: an aramid portion and a polyester portion; wherein the width ratio of the aramid fiber part to the terylene part is as follows: 3-5: 1; the joint between the two aramid fabrics is in a step lap joint mode. The invention can realize the step lapping method of the conveyer belt by the design of the aramid fabric, and greatly reduce the material cost of the aramid fabric by filling the low-price terylene. Compared with the traditional tooth-shaped lap joint, the theoretical step strength can reach 100 percent through the step lap joint, and compared with the tooth-shaped joint strength of 70 percent, the joint strength utilization rate can be improved by 30 percent, so that the design strength of aramid fabric can be reduced, and the material cost can be saved. The adoption of the step lapping joint method can facilitate the operation and increase the guarantee of the safety performance of the joint.
Description
Technical Field
The invention relates to the technical field of rubber, in particular to aramid fabric, a preparation method thereof and an aramid fiber conveying belt.
Background
The aramid fiber is used as a novel material, and has the advantages of low density, high strength, high modulus, low elongation and creep rate and good thermal stability, and is gradually applied to the field of conveying belts. The conveyer belt product made of aramid fiber as framework material has good impact resistance and tear resistance, stable operation, low elongation, light weight and good grooving performance. Compared with a steel wire rope core conveying belt, the steel wire rope core conveying belt can effectively solve the problems of poor tear resistance, poor water resistance and corrosion resistance, poor bending fatigue resistance and the like of the steel wire rope core conveying belt, has the weight reduced by 35-45 percent compared with the steel wire rope core conveying belt of the same model, and can effectively reduce the energy consumption of the conveyor in operation. The aramid fiber conveying belt is an energy-saving conveying belt product with good development prospect at present.
Although the aramid fiber conveying belt has a plurality of advantages, the low joint strength is the weakest link of the aramid fiber conveying belt, and the popularization and the application of the product are directly influenced. The aramid cloth for the conveyer belt is generally of a single-layer structure, the joint is carried out by adopting a tooth-shaped vulcanization connection method at present, and the joint strength can only reach about 70 percent of that of the belt body joint. Therefore, in order to achieve the joint strength meeting the standard requirements, the requirement of the joint strength is met only by improving the tensile strength of the aramid cloth, so that huge waste is caused. For example, the DPP2000 type aramid fabric has the nominal strength of more than or equal to 2000N/mm, and in order to meet the requirement of joint strength, the actual manufacturing strength reaches 2857N/mm.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is to provide an aramid cloth, and the method for overlapping the aramid cloth provided by the invention can improve the joint efficiency, improve the joint strength and save the aramid material.
The invention provides aramid cloth, which comprises: an aramid portion and a polyester portion; wherein the width ratio of the aramid fiber part to the terylene part is as follows: 3-5: 1; the joint between the two aramid fabrics is in a step lap joint mode.
Preferably, the step lapping specifically comprises:
and cutting off redundant aramid fabrics according to the principle of step complementation between aramid fabrics, and enabling the aramid fibers of one aramid fabric to be adjacent to the aramid fibers of the other aramid fabric.
Preferably, the number of steps overlapped by the steps is 4.
Preferably, in the aramid fabric, the width ratio of aramid to terylene is as follows: 4:1.
Preferably, the height of each step in the step lapping is 8-12 cm; the length is 20 cm.
The invention provides a preparation method of aramid fabric, which comprises the following steps:
preparing warp yarns and weft yarns according to the measured and calculated strength of the aramid fabric; the measurement and calculation intensity of the aramid fabric is specifically as follows: design strength 1.25/joint strength percentage;
aramid filament yarn and polyester are used as warp yarns, and nylon is used as weft yarns; twisting and plying the warp yarns and the weft yarns;
weaving aramid fiber and terylene into cloth by adopting a straight warp and straight weft structure according to the width, and then dipping and sizing to obtain initial aramid cloth;
and overlapping joints of the initial aramid fabric in a step overlapping manner, then coating core glue and covering glue, and vulcanizing to obtain the aramid fabric.
Preferably, the wefts of the aramid fiber cloth woven by the straight-warp and straight-weft structure are positioned above and below the warps, and the mutual positions of the aramid fiber cloth are fixed by connecting the warps in a vertical crossing manner.
Preferably, the nylon wire density is 1870 dtex; the linear density of the aramid filament yarn is 3300dtex, and the density is 42 pieces/10 cm; the linear density of the terylene is 1870dtex, and the density is 84 pieces/10 cm; the density of the weft yarns is 34 yarns/10 cm; the twist number and the twist direction are 150-.
Preferably, the joint strength percentage is specifically as follows: the aramid cloth prepared in advance according to the method of the present invention was subjected to piecing and its piecing strength was measured.
The invention provides an aramid fiber conveying belt which is characterized by comprising aramid fiber cloth in any one of the technical schemes or aramid fiber cloth prepared by the preparation method in any one of the technical schemes.
Compared with the prior art, the invention provides aramid fiber cloth, which comprises the following components: an aramid portion and a polyester portion; wherein the width ratio of the aramid fiber part to the terylene part is as follows: 3-5: 1; the joint between the two aramid fabrics is in a step lap joint mode. The invention can realize the step lapping method of the conveyer belt by the design of the aramid fabric, and greatly reduce the material cost of the aramid fabric by filling the low-price terylene. Compared with the traditional tooth-shaped lap joint, the theoretical step strength can reach 100 percent through the step lap joint, and compared with the tooth-shaped joint strength of 70 percent, the joint strength utilization rate can be improved by 30 percent, so that the design strength of aramid fabric can be reduced, and the material cost can be saved. The adoption of the step lapping joint method can facilitate the operation and increase the guarantee of the safety performance of the joint.
Drawings
FIG. 1 is a schematic diagram of a 3-stage aramid cloth according to comparative example 1 of the present invention;
FIG. 2 is a schematic view of a 3-stage aramid belt joint according to comparative example 1 of the present invention;
fig. 3 is a schematic view of a 4-stage aramid cloth according to embodiment 1 of the present invention;
fig. 4 is a schematic view of a 4-stage aramid fiber conveying belt joint according to embodiment 1 of the present invention;
fig. 5 is a schematic diagram of a five-stage aramid cloth according to embodiment 2 of the present invention;
fig. 6 is a schematic view of a five-stage aramid fiber belt joint according to embodiment 2 of the present invention.
Detailed Description
The invention provides aramid fabric, a preparation method thereof and an aramid fiber conveyer belt, and can be realized by appropriately improving process parameters by referring to the content. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The invention provides aramid cloth, which comprises: an aramid portion and a polyester portion; wherein the width ratio of the aramid fiber part to the terylene part is as follows: 3-5: 1; the joint between the two aramid fabrics is in a step lap joint mode.
Aramid fiber is the framework material of the cloth for the conveyer belt, and terylene (or other similar materials such as chinlon and the like) is the filling material.
The aramid fiber cloth provided by the invention comprises an aramid fiber part and a polyester part. Wherein the width ratio of the aramid fiber part to the terylene part is as follows: 3-5: 1; preferably 3:1, 4:1 or 5: 1; more preferably 4: 1.
The aramid fabric is woven by adopting aramid fiber and terylene, and the price of the aramid fiber is 200 yuan/kg, while the price of the terylene is 13 yuan/kg. Therefore, in the design, segmented production (part of terylene replaces aramid fiber according to a certain width) is adopted, and the terylene plays a role in filling and reserves space for realizing step lapping.
The joint mode between two pieces of aramid fabric is step lap joint.
The step lapping specifically comprises:
and cutting off redundant aramid fabrics according to the principle of step complementation between aramid fabrics, and enabling the aramid fibers of one aramid fabric to be adjacent to the aramid fibers of the other aramid fabric.
According to the invention, the height of each step in the step lap joint is 8-12 cm; the length is 20 cm. The step lap joint is generally a 3-step lap joint, and can also be a 4-6-step lap joint. Taking 3 steps of step overlapping as an example, each step is designed to be about 10mm, the width of the 10mm contains a certain number of aramid cords, and the diameters (widths) of the aramid cords are different due to different types of aramid fabrics, for example, the width (width) of a single cord of a DPP2000 type aramid fabric is 3.5mm, the width of each step is 3.5 × 3 to 10.5mm, the width of a group of aramid cords is 10.5 × 3 to 31.5mm, the width of a group of polyester is 10.5 to 12mm (the width of the polyester should be slightly larger than the width of a single group of aramid cords by about 1mm), so that the joints have enough space for arrangement, and the width of a complete group of aramid cords and polyester is 31.5+11 to 42.5 mm.
The number of steps overlapped by the steps is preferably 4.
The aramid fabric strength is measured and calculated according to aramid fiber, and the step lap joint of the joint is generally 3-5 steps. When the step lapping is 3 steps, wherein 3 steps are aramid fibers, 1 step is terylene, and the aramid fiber occupancy is 3/4-75%; when the step lapping is 4 steps, wherein 4 steps are aramid fibers, 1 step is terylene, and the aramid fiber occupancy is 4/5-80%. (ii) a When the step lapping is 5 steps, wherein 5 steps are aramid fibers, 1 step is terylene, and the aramid fibers account for 5/6-83.3%.
The joint mode is designed into a step lapping mode, so that each step is guaranteed to have corresponding strong connection, and the theoretical value of the joint strength utilization rate can reach 100% in the step mode.
The invention provides a preparation method of aramid fabric, which comprises the following steps:
preparing warp yarns and weft yarns according to the measured and calculated strength of the aramid fabric; the measurement and calculation intensity of the aramid fabric is specifically as follows: design strength 1.25/joint strength percentage;
aramid filament yarn and polyester are used as warp yarns, and nylon is used as weft yarns; twisting and plying the warp yarns and the weft yarns;
weaving aramid fiber and terylene into cloth by adopting a straight warp and straight weft structure according to the width, and then dipping and sizing to obtain initial aramid cloth;
and overlapping joints of the initial aramid fabric in a step overlapping manner, then coating core glue and covering glue, and carrying out vulcanization to obtain the aramid fabric.
The preparation method of the aramid fabric provided by the invention comprises the steps of firstly preparing warps and wefts according to the measurement and calculation strength of the aramid fabric; the measurement and calculation intensity of the aramid fabric is specifically as follows: design strength 1.25/joint strength percentage.
Wherein, the strength percentage of the joint is as follows: the aramid cloth prepared in advance according to the method of the present invention was subjected to piecing and its piecing strength was measured.
Firstly, the overall strength of the cloth is measured and calculated according to the fact that aramid fibers are used as framework materials, and when the design that the step overlapping is 4-step is adopted, the aramid fiber proportion is 4/5 and the terylene proportion is 1/5 in each group of aramid fiber cloth. The aramid fiber accounts for 80% of the width of the whole aramid fabric. The nominal strength of the belt body is fixed, so that the aramid strength is designed according to the condition that the aramid fiber accounts for 80% of aramid fiber fabric, for example, DPP2000 type aramid fiber fabric, and the aramid fiber strength is designed to be 2200 × 5/4-2500N/mm in order to achieve 2000N/mm of the overall aramid fiber fabric strength. The strength of the aramid fabric joint manufactured in the mode can reach about 89% of the belt body strength, and in order to maintain the strength of DPP2000, the aramid fabric is designed to have the following design strength: 2000 × 5/4 × 100/89 ═ 2809N/mm.
Aramid filament yarn and polyester are used as warp yarns, and nylon is used as weft yarns; twisting and plying the warp yarns and the weft yarns.
And respectively twisting and plying the aramid fiber and the terylene according to the designed strength. Taking the example that the step lap joint is 4 steps, aramid filaments and partial terylene are used as warp yarns, and nylon is used as weft yarns to twist the warp yarns and the weft yarns.
The nylon wire density of the invention is 1870 dtex; the linear density of the aramid filament yarn is 3300dtex, and the density is 42 pieces/10 cm; the linear density of the terylene is 1870dtex, and the density is 84 pieces/10 cm; the density of the weft yarns is 34 yarns/10 cm; the twist and the twist direction are 150-.
The aramid fiber and the terylene are woven into cloth by adopting a straight warp and straight weft structure according to the width.
The weft of the aramid fiber cloth woven by the straight warp and straight weft structure is positioned above and below the warp, and the mutual positions of the weft and the aramid fiber cloth are fixed by connecting the warp to cross up and down.
The aramid fabric knitted by straight warp and straight weft can obtain larger fabric structure density, and the strength retention rate is more than 90 percent after the fiber is knitted into the fabric. The manufactured conveying belt is not easy to elongate when bearing tensile force.
And then dipping and shaping to obtain the initial aramid fabric.
And (4) dipping glue according to a normal process. And (3) preparing glue paste in advance, putting the aramid fiber tape into the glue paste for gum dipping, and then carrying out shaping treatment. The present invention is not limited thereto, and those skilled in the art will be familiar with it.
And overlapping joints of the initial aramid fabric in a step overlapping manner, then coating core glue and covering glue, and vulcanizing to obtain the aramid fabric.
The conveyor belt to be spliced is first of all subjected to the necessary knowledge: the grade, width, thickness and thickness of the belt, and the like of the belt, and according to the measurement result, the corresponding specification of the rubber sheet, the rubberizing (the rubberizing thickness is 1.5-2.0mm), the adhesive (which must be prepared by using a special connector adhesive formula for the aramid belt), the gumming mesh fabric (preferably the gumming mesh fabric in the table 2, or the gumming mesh fabric with the space of 4 +/-0.5 mm and the gram weight of not less than 300 g), the release paper, the sizing block and the like are prepared.
After the preparation work of tape vulcanization is done, the installation of a vulcanizing machine can be carried out:
the lower cross beam of the rack is arranged in a straight line and the gap between the lower cross beam and the lower cross beam is uniform; placing a thin-wall hydraulic plate in the middle of the lower cross beam; a lower heat insulation plate is arranged on the water pressure plate; the lower heating plate was placed, taking care that the heating surface was facing upwards. The cooling plate is placed along with the heating plate; placing the vulcanized adhesive tape on a heating plate; two sides of the adhesive tape are provided with sizing blocks. The clamping device fixes the two sizing blocks, and the screw rod is rotated by the handle, so that the vulcanized rubber belt is basically clamped by the steel clamp. When the vulcanized joint is larger than 800mm, the two machines are combined for vulcanization, and galvanized iron sheets and silicone oil paper with the length of 0.5mm multiplied by 1000mm multiplied by length (the length is the same as the width of the adhesive tape) are placed at the joint of the two lower heating plates. An upper heating plate is arranged, the heating surface is downward, and the outlet is consistent with the lower heating plate. The two machines are combined for vulcanization, and galvanized iron sheets and silicone oil paper with the length of 0.5mm multiplied by 1000mm multiplied by the width of the adhesive tape are placed at the joint of the two lower heating plates. A cooling plate and a heat insulating plate are placed on the upper heating plate. The upper cross beam is arranged to be aligned with the lower cross beam up and down and left and right. An M38 screw and a nut are arranged, and the tightening degree of the nut is required to be the same. A manual (electric) hydraulic pump is arranged, a high-pressure water pipe is connected, a quick connector at the other end is directly inserted into a hydraulic plate to feed water, and a hydraulic plate cooling pipe is connected to ensure that water feeding and discharging of each plate are smooth.
The joint of the invention is preferably made as follows:
firstly, the method comprises the following steps: and (5) manufacturing the step joint. Determination of joint parameters
TABLE 1,
| Strength specification | Finger width bf | Minimum finger length lf |
| 2000S | 60 | 200 |
When the step width is 60mm, the standard band width divided by 60 is equal to odd number (such as band widths 800, 1000, 1400 and 1600mm), the center line of the belt in the running direction is on the center line of one step of the belt, and the standard band width divided by 60 is equal to even number (such as band width 1200), and the center line of the belt in the running direction is in the middle of two steps of the belt.
Then, cutting steps, specifically: cutting steps by using a cutter or an art designer. When cutting steps, the cutting knife positioning plate is placed under the belt body according to the outward direction of the head, and the tooth cutting is carried out by a crossheading combination method; and continuously cutting until all the parts are cut.
Followed by a surface treatment. Removing the rubber layer of the cut ladder by using an electric planer or a cutter, keeping the thickness from the rubber layer to the cloth to be about 0.5mm, and preventing the depth from damaging the framework material of the belt; the surface is slightly polished by an electric hairbrush, and one part is not intensively polished during polishing, so that the covering glue is prevented from being damaged by heat generation. Meanwhile, certain attention must be paid to avoiding cloth leakage and damaging the skeleton material;
scrubbing the stains on the surface with gasoline for later use.
Then, positioning is specifically as follows: butting the cut steps and placing the cut steps on a vulcanizing flat plate;
the two belt heads are laid flat, two central points are respectively found out at the two belt heads, and the two belt heads are placed on the same central line according to the four central points;
and aligning, and fixing the belt body at two ends of the flat plate by using the fixing pressing strips.
Coating slurry: the demoulding paper, the cover rubber film, the mesh fabric and the rubberizing film are sequentially placed under the belt body, and the edges of the rubber films are in butt joint with the cutting edges of the belt. Cleaning the surface of the cross section with the steps with gasoline, and then coating an adhesive, wherein the adhesive is not coated too much, the thickness of the adhesive is uniform as that of a paint, and the adhesive can be coated once, and the adhesive is arranged and placed flatly according to the sequence after being dried; filling the positions with the step gaps exceeding 5mm by using adhesive tapes; cleaning the upper surface of the belt with gasoline, drying, sequentially placing adhesive tape, mesh cloth and cover rubber (which can be formed first) on the belt body to make the specification of the rubber sheet be the same as the edge size of the cutting teeth, placing rubber strips on the edge part and compacting; the edge of the film and the transverse joint of the film and the belt can be coated with a proper amount of mucilage to facilitate adhesion. After the release paper is laid flat, the working backing plate, the vulcanizing plate and the cross beam are placed on the release paper, and equipment assembly is carried out. And after assembly, the pressure of each nut is uniformly applied, and the pressure of each cross beam is kept consistent.
And finally, carrying out pressure vulcanization, specifically: the input power of the heating plate is firstly connected. Then the power supply wire, the grounding wire and the thermocouple are connected and then electrified. And tightening the nut again when the temperature rises to 70-80 ℃, and starting to pressurize to the pressure required by the process when the temperature rises to 100 ℃. And (4) heating to the required temperature, then carrying out heat preservation and pressure maintaining, frequently checking the temperature and pressure conditions during the period, and timely adjusting to the process range. After the vulcanization is finished, the power supply is cut off completely, and water is introduced for cooling. After cooling to below 60 ℃, the assembly is disassembled in the reverse order.
After the vulcanization is finished, the pressure is released from two sides to the middle until the pressure is 0, and the assembly is disassembled according to the reverse sequence of the assembly. And completely assembling the disassembled equipment parts. The power cord is removed, and the tools are collected and put back into the tool box.
The vulcanization process of the present invention is specifically shown in table 2,
TABLE 2 vulcanization joint Process
The process of table 2 is performed if cooling with cooling water is employed; if natural cooling is adopted, the positive vulcanization time should be reduced by 5 minutes.
The invention provides an aramid fiber conveying belt which is characterized by comprising aramid fiber cloth in any one of the technical schemes or aramid fiber cloth prepared by the preparation method in any one of the technical schemes.
The invention provides aramid cloth, which comprises: an aramid portion and a polyester portion; wherein the width ratio of the aramid fiber part to the terylene part is as follows: 3-5: 1; the joint between the two aramid fabrics is in a step lap joint mode. The invention can realize the step lapping method of the conveyer belt by the design of the aramid fabric, and greatly reduce the material cost of the aramid fabric by filling the low-price terylene. Compared with the traditional tooth-shaped lap joint, the theoretical step strength can reach 100 percent through the step lap joint, and compared with the tooth-shaped joint strength of 70 percent, the joint strength utilization rate can be improved by 30 percent, so that the design strength of aramid fabric can be reduced, and the material cost can be saved. The adoption of the step lapping joint method can facilitate the operation and increase the guarantee of the safety performance of the joint.
In order to further illustrate the present invention, the aramid fabric, the preparation method thereof and the aramid fiber conveyer belt provided by the present invention are described in detail below with reference to examples.
Comparative example 1: joint strength detection of the aramid fabric by 3-step lap joint
The design is carried out by adopting a 3-step lap joint mode, in each group of aramid fabric, the width of the aramid filament in the warp accounts for 75% of that of each group of aramid fabric, and the width of the polyester filament accounts for 25% of that of each group of aramid fabric. The structural schematic diagram of the aramid cloth is shown in fig. 1, and fig. 1 is a schematic diagram of a 3-stage aramid cloth described in comparative example 1 of the present invention. The joint mode is an overlapping method as shown in figure 2, and figure 2 is a schematic view of a 3-stage aramid conveying belt joint in comparative example 1 of the invention.
The aramid fabric joint manufactured in the mode is detected to have the strength which is about 91 percent of that of the belt body joint, and in order to maintain the strength of DPP2000, the aramid fabric is designed to have the design strength of the aramid part as follows: 2000 × 4/3 × 100/91 ═ 2931N/mm. When the order is used, although the joint efficiency is improved, the design strength of the aramid cloth is improved, and the material cost is not saved.
Example 1: joint strength detection is carried out on the aramid fabric by adopting 4-step lap joint
The design is carried out by adopting a 4-step lap joint mode, in each group of aramid fabric, the width of the aramid filament in the warp accounts for 80% of that of each group of aramid fabric, and the width of the polyester filament accounts for 20% of that of each group of aramid fabric. Taking DPP2000 aramid fabric as an example, in order to achieve an aramid fabric bulk strength of 2000N/mm, the aramid fabric strength was designed to be 2000 × 5/4 — 2500N/mm. The structural schematic diagram of the aramid cloth is shown in fig. 3, and fig. 3 is a schematic diagram of 4-order aramid cloth in embodiment 1 of the invention; the joint mode is a lap joint method as shown in figure 4; fig. 4 is a schematic view of a 4-stage aramid fiber conveying belt joint according to embodiment 1 of the present invention.
The aramid fabric joint manufactured in the mode can reach about 89% of the belt body joint strength through detection, and in order to maintain the strength of DPP2000, the aramid fabric is designed with the design strength of the aramid part as follows: 2000 × 5/4 × 100/89 ═ 2809N/mm. When the order is used, the joint efficiency is improved, the design strength of aramid fabric is lower than that of a tooth-shaped joint, and the material cost is saved.
Example 2: joint strength detection of the aramid fabric by 5-step lap joint
The design is carried out by adopting a 5-step lap joint mode, in each group of aramid fabric, the width of the aramid filament in the warp accounts for 83.3 percent of that of each group of aramid fabric, and the width of the polyester filament accounts for 16.7 percent of that of each group of aramid fabric. Taking DPP2000 aramid fabric as an example, in order to achieve an aramid fabric bulk strength of 2000N/mm, the aramid fabric strength was designed to be 2000 × 6/5 — 2400N/mm. The structural schematic diagram of the aramid cloth is shown in fig. 5, and fig. 5 is a schematic diagram of a five-stage aramid cloth in embodiment 2 of the invention; the joint mode is an overlapping method, as shown in fig. 6, and fig. 6 is a schematic view of a joint of a five-stage aramid fiber conveyer belt according to embodiment 2 of the present invention.
The aramid fabric joint manufactured in the mode can only reach about 88% of the strength of the belt body joint, and in order to maintain the strength of DPP2000, the aramid fabric is designed to have the following design strength: 2000 × 6/5 × 100/88 ═ 2727N/mm. When the order is used, the joint efficiency is improved, the design strength of aramid fabric is lower than that of a tooth-shaped joint, and the material cost is saved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An aramid cloth, comprising: an aramid portion and a polyester portion; wherein the width ratio of the aramid fiber part to the terylene part is as follows: 3-5: 1; the joint between the two aramid fabrics is in a step lap joint mode.
2. The aramid cloth of claim 1, wherein the step lap specifically is:
and cutting off redundant aramid fabrics according to the principle of step complementation between aramid fabrics, and enabling the aramid fibers of one aramid fabric to be adjacent to the aramid fibers of the other aramid fabric.
3. The aramid cloth of claim 1 wherein the number of steps that the steps overlap is 4 steps.
4. The aramid fabric of claim 1, wherein the aramid fabric has a width ratio of aramid to polyester: 4:1.
5. The aramid cloth of claim 1 wherein the height of each step in the step lap is 8-12 cm; the length is 20 cm.
6. The preparation method of the aramid fabric is characterized by comprising the following steps of:
preparing warp yarns and weft yarns according to the measured and calculated strength of the aramid fabric; the measurement and calculation intensity of the aramid fabric is specifically as follows: design strength 1.25/joint strength percentage;
aramid filament yarn and polyester are used as warp yarns, and nylon is used as weft yarns; twisting and plying the warp yarns and the weft yarns;
weaving aramid fiber and terylene into cloth by adopting a straight warp and straight weft structure according to the width, and then dipping and sizing to obtain initial aramid cloth;
and overlapping joints of the initial aramid fabric in a step overlapping manner, then coating core glue and covering glue, and vulcanizing to obtain the aramid fabric.
7. The method for preparing the aramid fiber cloth according to claim 6, wherein the straight warp and straight weft structure is woven such that the weft of the aramid fiber cloth is positioned above and below the warp, and the mutual positions are fixed by connecting the warp to cross up and down.
8. The method of claim 6, wherein the nylon has a linear density of 1870 dtex; the linear density of the aramid filament yarn is 3300dtex, and the density is 42 pieces/10 cm; the linear density of the terylene is 1870dtex, and the density is 84 pieces/10 cm; the density of the weft yarns is 34 yarns/10 cm; the twist number and the twist direction are 150-.
9. The method according to claim 6, wherein the joint strength percentages are in particular: the aramid cloth prepared in advance according to the method of the present invention was subjected to piecing and its piecing strength was measured.
10. An aramid conveyer belt, characterized by comprising aramid fabric according to any one of claims 1 to 5 or aramid fabric prepared by the preparation method according to any one of claims 6 to 9.
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| CN202011399574.2A CN112458597A (en) | 2020-12-02 | 2020-12-02 | Aramid fabric, preparation method thereof and aramid fiber conveying belt |
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| CN202011399574.2A CN112458597A (en) | 2020-12-02 | 2020-12-02 | Aramid fabric, preparation method thereof and aramid fiber conveying belt |
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| CN202011399574.2A Pending CN112458597A (en) | 2020-12-02 | 2020-12-02 | Aramid fabric, preparation method thereof and aramid fiber conveying belt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960002A (en) * | 2022-05-23 | 2022-08-30 | 青岛铠硕机械科技有限公司 | Cloth transfer device of water jet loom |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960002A (en) * | 2022-05-23 | 2022-08-30 | 青岛铠硕机械科技有限公司 | Cloth transfer device of water jet loom |
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