CN110127282B

CN110127282B - Aramid fabric framework flame-retardant conveying belt for coal mine

Info

Publication number: CN110127282B
Application number: CN201910405425.3A
Authority: CN
Inventors: 余捃晗; 刘波华; 郑启航
Original assignee: Zhejiang Feifei Technology Co Ltd; Zhejiang Fenfei Rubber & Plastic Products Co ltd
Current assignee: Zhejiang Feifei Technology Co., Ltd; ZHEJIANG FENFEI RUBBER & PLASTIC PRODUCTS Co.,Ltd.
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2021-08-03
Anticipated expiration: 2039-05-16
Also published as: CN110127282A

Abstract

The invention relates to an aramid fabric framework flame-retardant conveying belt for a coal mine, which comprises a belt body made of chloroprene rubber; the belt body comprises an upper covering layer rubber, an A transition rubber layer, a B transition rubber layer and a lower covering layer rubber which are sequentially arranged from outside to inside, wherein the thickness of the upper covering layer rubber is 4-12 mm, and the thickness of the lower covering layer rubber is 3-6 mm; a framework layer is arranged between the transition rubber layer A and the transition rubber layer B; the framework layer consists of a layer of aramid fiber canvas and a gum dipping layer coated on the outer surface of the aramid fiber canvas, and the thickness of the framework layer is 2.5-6 mm; the raw material components of the upper covering layer rubber and the lower covering layer rubber contain flame retardant; the flame retardant is one or more of chlorinated paraffin, antimony oxide, zinc borate and ammonium polyphosphate. The flame-retardant conveyer belt with the aramid fiber fabric framework for the coal mine can convey materials in high-strength, long-distance and large-capacity occasions, is suitable for being applied to the severe environment of underground operation of the coal mine, and has high heat resistance and fireproof performance.

Description

Aramid fabric framework flame-retardant conveying belt for coal mine

Technical Field

The invention relates to a rubber conveyer belt, in particular to an aramid fabric framework flame-retardant conveyer belt for a coal mine.

Background

The conveying belt is a main part of a belt conveyor and is widely applied to large-scale continuous transportation in coal, mine, metallurgy, chemical industry, building, traffic and other departments.

China is a large coal mining country, so that the demand of underground conveying belts is huge, but because the underground transportation conditions of the coal mine in China are generally poor, the underground conveying belts usually have flammable gas, related operations under the mine are required not to generate sparks, and fire disasters are avoided. Therefore, the rubber conveyor belt used in coal mining is required to have better flame retardant property.

In addition, the existing coal mine flame-retardant conveyor belt generally adopts a metal framework as a framework layer to ensure the strength of the conveyor belt, but the adhesion strength of the metal framework and rubber is not enough, so that the framework and the rubber are easy to peel off when the conveyor belt works, and then cracks are easy to appear in the rubber, which is not favorable for the long-term use of the conveyor belt; if the common ropes (cotton ropes, polyester ropes and the like) are adopted as the framework layers of the coal mine flame-retardant conveying belt, the coal mine flame-retardant conveying belt has the defect of insufficient strength and is not suitable for being used in the coal mine industry for a long time; and the coal mine flame-retardant conveyor belt also needs to have excellent performances such as impact resistance, wear resistance and tear resistance, and the conditions make people have high requirements on various performances of the coal mine flame-retardant conveyor belt.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the aramid fabric framework flame-retardant conveying belt for the coal mine, which can convey materials (coal) in high-strength, long-distance and large-conveying-capacity occasions, is suitable for being applied to the severe environment of underground operation of the coal mine, has excellent impact resistance, wear resistance and tear resistance, has a stable belt body structure, and also has good flame retardant property.

The aramid fabric framework flame-retardant conveying belt for the coal mine comprises a belt body made of chloroprene rubber; the belt body comprises an upper covering layer rubber, an A transition rubber layer, a B transition rubber layer and a lower covering layer rubber which are sequentially arranged from outside to inside, wherein the thickness of the upper covering layer rubber is 4-12 mm, and the thickness of the lower covering layer rubber is 3-6 mm; a framework layer is arranged between the transition rubber layer A and the transition rubber layer B; the framework layer consists of a layer of aramid fiber canvas and a gum dipping layer coated on the outer surface of the aramid fiber canvas, and the thickness of the framework layer is 2.5-6 mm; the raw material components of the upper covering layer rubber and the lower covering layer rubber contain a flame retardant; the flame retardant is one or more of chlorinated paraffin, antimony oxide, zinc borate and ammonium polyphosphate.

Compared with the prior art, the aramid fabric framework flame-retardant conveyor belt for the coal mine has the following remarkable progress:

1) the aramid fiber fabric framework flame-retardant conveying belt for the coal mine has good impact resistance due to the upper covering layer rubber and the lower covering layer rubber with specific thicknesses, so that the conveying belt can well cope with the impact force of materials in the transportation process of the coal mine, ores can be conveyed more stably, and the using effect is guaranteed; specific flame retardants are added into the upper covering layer rubber and the lower covering layer rubber, so that the belt body has a good flame retardant effect, and the belt body is guaranteed to have excellent safety performance;

2) the flame-retardant conveying belt with the aramid fiber fabric framework for the coal mine adopts the dipped aramid fiber canvas as the framework, and the aramid fiber canvas has the characteristics of high strength, low extension and good flexibility, so that the flame-retardant conveying belt is suitable for conveying materials in a long distance and is suitable for conveying belts with long-distance transmission requirements in the coal mine and the like; compared with the traditional steel wire conveying belt, the conveying belt has the advantage of light weight, and the weight is reduced by 30-60% under the condition of keeping the same whole belt strength; meanwhile, the diameter of the transmission roller of the conveyor is reduced (namely, under the same requirement, a smaller transmission roller can be used), the running power consumption is reduced by 20-30%, and the maintenance workload can be reduced;

3) a, B transition rubber layer can be fine connect casing ply and upper and lower overburden rubber, and then has improved area body stability for the skeleton combines firmly with rubber, has increased the buffer nature of conveyer belt on the one hand, and on the other hand promotes the wearability of conveyer belt, thereby, has further increased the life of conveyer belt.

As optimization, the raw material components of the upper covering layer rubber and the lower covering layer rubber are the same and comprise the following components in parts by weight:

the upper covering layer rubber and the lower covering layer rubber are made of chloroprene rubber as a main material, and the inventor redesigns the formula aiming at the defect of poor cold resistance and storage stability of the chloroprene rubber, and finds that the upper covering layer rubber and the lower covering layer rubber have good temperature change resistance and cold resistance while having high tensile strength, elongation, oil resistance, heat resistance, combustion resistance, sunlight resistance, ozone resistance, acid and alkali resistance and chemical reagent resistance by adopting the formula with the specific proportion, so that the storage time of the upper covering layer rubber and the lower covering layer rubber is prolonged, and the service life of the conveyer belt is greatly prolonged; according to the formula, the specific dosage of chlorinated paraffin, antimony oxide, zinc borate and ammonium polyphosphate are reasonably selected as the flame retardant according to the combustion test of the alcohol blast burner and the propane combustion test, so that the safety performances of the flame-retardant conveyer belt with the aramid fiber fabric framework for the coal mine, such as the combustion of the alcohol blast burner, the combustion of propane, static conduction, roller friction and the like, all meet the enterprise standard requirement Q/ZJFF 001-.

As further optimization, the raw material components of the upper covering layer rubber and the lower covering layer rubber also comprise nanosphere lubricant, and the using amount is 0.2-0.3 part. Researches show that in the formula of the covering layer rubber, the nanosphere lubricant can increase the mixing uniformity of chlorinated paraffin, antimony oxide, zinc borate and ammonium polyphosphate in the upper covering layer rubber and the lower covering layer rubber, so that the belt body has good flame retardant property in all directions; the interaction between other fillers and rubber is increased, so that the payne effect of the rubber is reduced, and the tensile strength, the elongation at break and the temperature change resistance of the upper covering layer rubber and the lower covering layer rubber are better increased.

As optimization, the raw material components of the upper covering layer rubber and the lower covering layer rubber are as follows according to the parts by weight: 100 parts of chloroprene rubber, 3 parts of zinc oxide, 3 parts of magnesium oxide, 5 parts of sulfur, 1.5 parts of stearic acid, 2 parts of plasticizer TCP, 4 parts of aromatic oil, 6 parts of anti-aging agent, 11040 parts of carbon black N, 0.25 part of nanosphere lubricant, 4 parts of ammonium polyphosphate, 4 parts of chlorinated paraffin, 2 parts of antimony oxide, 1.5 parts of zinc borate, 2 parts of accelerator TMTD, 2 parts of accelerator DTDM and 0.5 part of anti-scorching agent CTP. When the preferable formula is adopted for the upper covering layer rubber and the lower covering layer rubber, the upper covering layer rubber and the lower covering layer rubber have higher tensile strength and elongation at break, so that the conveying belt can convey materials under the occasions with high strength, long distance and large conveying capacity, and the requirements of severe environments for underground coal mine operation on the conveying belt are met; and the conveyer belt has the advantage of low abrasion, and can ensure that the abrasion of the conveyer belt can still be normally used after the conveyer belt works for a long time.

For optimization, the transition rubber layer A and the transition rubber layer B are the same in raw material components and comprise the following components in parts by weight:

at the moment, the transition rubber layer of the formula can be well connected with the covering layer rubber and the framework layer, and the transition rubber layer has good tensile strength, tear strength, wear resistance and anti-cracking performance, so that the aramid fabric framework flame-retardant conveyor belt for the coal mine has good structural stability and shock absorption, and is not easy to generate belt body layering after being used for a long time. Further, the transition rubber layer A and the transition rubber layer B comprise the following raw material components in parts by weight: 100 parts of chloroprene rubber, 3 parts of zinc oxide, 3 parts of magnesium oxide, 5 parts of sulfur, 1.5 parts of stearic acid, 2 parts of plasticizer TCP, 4 parts of aromatic oil, 6 parts of anti-aging agent, 4 parts of carbon black N32635, 4 parts of ammonium polyphosphate, 7 parts of rubber adhesive RA, 2 parts of accelerator TMTD, 2 parts of accelerator DTDM and 0.5 part of antiscorching agent CTP.

Preferably, the thickness of the transition rubber layer A is 20% -40% of that of the upper covering layer rubber, and the thickness of the transition rubber layer B is 15% -30% of that of the lower covering layer rubber. At the moment, the combination of all layers in the belt body of the aramid fabric framework flame-retardant conveying belt for the coal mine is relatively firmer, so that the service life of the belt body is greatly prolonged.

Preferably, the gum dipping layer is formed by a gum solution formed by emulsifying natural rubber. The combination of the natural rubber and the chloroprene rubber can greatly increase the bonding strength of the framework layer and the A, B transition rubber layer, thereby further ensuring the structural stability inside the belt body. Furthermore, the square meter dry weight of the framework layers is 1000-4000 g per square meter. Therefore, the adhesive strength between the framework layer and the A, B transition rubber layer is further improved, and the transportation stability of the conveyer belt in use is further ensured.

Drawings

FIG. 1 is a schematic structural diagram of a flame-retardant conveyer belt with an aramid fabric framework for coal mines, provided by the invention;

FIG. 2 is a diagram illustrating a specific model specification of a flame-retardant conveyor belt of the enterprise standard Q/ZJFF 001-2019;

FIG. 3 is a diagram of a flame retardant conveyor belt of the enterprise standard Q/ZJFF 001 and 2019.

Reference numerals: 1-belt body, 11-upper covering rubber, 12-A transition rubber layer, 13-B transition rubber layer and 14-lower covering rubber; 2-framework layer, 21-aramid canvas and 22-gum dipping layer.

The technical solution of the present invention is further specifically described below by using specific embodiments and with reference to the accompanying drawings.

In the present invention, the raw materials and equipment used are commercially available or commonly used in the art, unless otherwise specified. The methods in the following examples are conventional in the art unless otherwise specified.

Example 1

Referring to fig. 1, the aramid fabric framework flame-retardant conveyor belt for coal mines comprises a belt body 1 made of chloroprene rubber; the belt body 1 comprises an upper covering layer rubber 11, an A transition rubber layer 12, a B transition rubber layer 13 and a lower covering layer rubber 14 which are sequentially arranged from top to bottom, wherein the thickness of the upper covering layer rubber 11 is 8mm, and the thickness of the lower covering layer rubber 14 is 4 mm; a framework layer 2 is arranged between the transition rubber layer A12 and the transition rubber layer B13; the framework layer 2 consists of a layer of aramid fiber canvas 21 and a gum dipping layer 22 coated on the outer surface of the aramid fiber canvas 21, and the thickness of the framework layer 2 is 4 mm; the raw material components of the upper covering layer rubber 11 and the lower covering layer rubber 14 contain flame retardant; the flame retardant is one or more of chlorinated paraffin, antimony oxide, zinc borate and ammonium polyphosphate; the thickness of the A transition rubber layer 12 is 30% of that of the upper covering rubber 11, and the thickness of the B transition rubber layer 13 is 25% of that of the lower covering rubber 14; the gum dipping layer 22 is formed by a gum solution formed by emulsifying natural rubber; the square meter dry weight of the framework layers 2 is 3500 g/square meter; the raw material components of the upper covering layer rubber 11 and the lower covering layer rubber 14 comprise the following components in parts by weight: 100 parts of chloroprene rubber, 3 parts of zinc oxide, 3 parts of magnesium oxide, 5 parts of sulfur, 1.5 parts of stearic acid, 2 parts of plasticizer TCP, 4 parts of aromatic oil, 6 parts of anti-aging agent, 11040 parts of carbon black N, 0.25 part of nanosphere lubricant, 4 parts of ammonium polyphosphate, 4 parts of chlorinated paraffin, 2 parts of antimony oxide, 1.5 parts of zinc borate, 2 parts of accelerator TMTD, 2 parts of accelerator DTDM and 0.5 part of anti-scorching agent CTP. The transition rubber layer A and the transition rubber layer B comprise the following raw material components in parts by weight: 100 parts of chloroprene rubber, 3 parts of zinc oxide, 3 parts of magnesium oxide, 5 parts of sulfur, 1.5 parts of stearic acid, 2 parts of plasticizer TCP, 4 parts of aromatic oil, 6 parts of anti-aging agent, 4 parts of carbon black N32635, 4 parts of ammonium polyphosphate, 7 parts of rubber adhesive RA, 2 parts of accelerator TMTD, 2 parts of accelerator DTDM and 0.5 part of antiscorching agent CTP; the aramid fiber canvas 21 is formed by interweaving aramid fiber yarns in a warp-weft mode; the upper cover rubber 11, the A transition rubber layer 12, the framework layer 2, the B transition rubber layer 13 and the lower cover rubber 14 are integrally bonded through vulcanization.

Example 2

Unlike embodiment 1, in this embodiment, the thickness of the upper covering rubber 11 is 12mm, and the thickness of the lower covering rubber 14 is 3 mm; the thickness of the framework layer 2 is 2.5 mm; the thickness of the transition rubber layer A12 is 20% of that of the upper covering rubber layer 11, and the thickness of the transition rubber layer B13 is 15% of that of the lower covering rubber layer 14; the square meter dry weight of the framework layers 2 is 1000g per square meter; the raw material components of the upper covering layer rubber 11 and the lower covering layer rubber 14 are as follows by weight: 100 parts of chloroprene rubber, 2 parts of zinc oxide, 2 parts of magnesium oxide, 4 parts of sulfur, 1 part of stearic acid, 1 parts of plasticizer TCP, 3 parts of aromatic oil, 5 parts of anti-aging agent, 11030 parts of carbon black N, 0.2 part of nanosphere lubricant, 3 parts of ammonium polyphosphate, 3 parts of chlorinated paraffin, 1.5 parts of antimony oxide, 1 part of zinc borate, 1 part of accelerator TMTD, 1 part of accelerator DTDM and 0.4 part of anti-scorching agent CTP; the transition rubber layer A and the transition rubber layer B comprise the following raw material components in parts by weight: 100 parts of chloroprene rubber, 2 parts of zinc oxide, 2 parts of magnesium oxide, 4 parts of sulfur, 1 part of stearic acid, 1 parts of plasticizer TCP, 3 parts of aromatic oil, 5 parts of anti-aging agent, N32625 parts of carbon black, 3 parts of ammonium polyphosphate, 5 parts of rubber adhesive RA, 1 part of accelerator TMTD, 1 part of accelerator DTDM and 0.4 part of antiscorching agent CTP.

Example 3

The thickness of the upper covering layer rubber 11 is 7mm, and the thickness of the lower covering layer rubber 14 is 5 mm; the thickness of the framework layer 2 is 3 mm; the thickness of the transition rubber layer A12 is 40% of that of the upper covering rubber layer 11, and the thickness of the transition rubber layer B13 is 30% of that of the lower covering rubber layer 14; the square meter dry weight of the framework layers 2 is 2500g per square meter; the raw material components of the upper covering layer rubber 11 and the lower covering layer rubber 14 are as follows by weight: 100 parts of chloroprene rubber, 4 parts of zinc oxide, 4 parts of magnesium oxide, 6 parts of sulfur, 2 parts of stearic acid, 3 parts of plasticizer TCP, 5 parts of aromatic oil, 7 parts of anti-aging agent, 11050 parts of carbon black N, 0.3 part of nanosphere lubricant, 5 parts of ammonium polyphosphate, 5 parts of chlorinated paraffin, 2.5 parts of antimony oxide, 2 parts of zinc borate, 3 parts of accelerator TMTD, 3 parts of accelerator DTDM and 0.6 part of anti-scorching agent CTP; the transition rubber layer A and the transition rubber layer B comprise the following raw material components in parts by weight: 100 parts of chloroprene rubber, 4 parts of zinc oxide, 4 parts of magnesium oxide, 6 parts of sulfur, 2 parts of stearic acid, 3 parts of plasticizer TCP, 5 parts of aromatic oil, 7 parts of anti-aging agent, N32640 parts of carbon black, 5 parts of ammonium polyphosphate, 10 parts of rubber adhesive RA, 3 parts of accelerator TMTD, 3 parts of accelerator DTDM and 0.6 part of antiscorching agent CTP.

Example 4

The thickness of the upper covering layer rubber 11 is 9mm, and the thickness of the lower covering layer rubber 14 is 3.5 mm; the thickness of the framework layer 2 is 3.5 mm; the thickness of the transition rubber layer A12 is 25% of that of the upper covering rubber layer 11, and the thickness of the transition rubber layer B13 is 18% of that of the lower covering rubber layer 14; the square meter dry weight of the framework layers 2 is 2250g per square meter; the raw material components of the upper covering layer rubber 11 and the lower covering layer rubber 14 are as follows by weight: 100 parts of chloroprene rubber, 2.5 parts of zinc oxide, 2.4 parts of magnesium oxide, 4.5 parts of sulfur, 1.2 parts of stearic acid, 1.8 parts of plasticizer TCP, 3.5 parts of aromatic oil, 5.5 parts of anti-aging agent, 11035 parts of carbon black, 0.25 part of nanosphere lubricant, 3.5 parts of ammonium polyphosphate, 3.5 parts of chlorinated paraffin, 1.8 parts of antimony oxide, 1.8 parts of zinc borate, 1.5 parts of accelerator TMTD, 1.5 parts of accelerator DTDM and 0.45 part of anti-scorching agent CTP; the transition rubber layer A and the transition rubber layer B comprise the following raw material components in parts by weight: 100 parts of chloroprene rubber, 2.5 parts of zinc oxide, 2.4 parts of magnesium oxide, 4.5 parts of sulfur, 1.2 parts of stearic acid, 1.8 parts of plasticizer TCP, 3.5 parts of aromatic oil, 5.5 parts of anti-aging agent, 4.5 parts of ammonium polyphosphate, 8 parts of rubber adhesive RA, 1.5 parts of accelerator TMTD, 1.5 parts of accelerator DTDM and 0.45 part of anti-scorching agent CTP.

The manufacturing method of the conveying belt comprises the following steps:

(1) preparing a mixed rubber sheet of upper covering layer rubber 11 and lower covering layer rubber 14, and cutting for later use;

(2) preparing a mixed rubber sheet of the transition rubber layer A12 and the transition rubber layer B13, and cutting for later use;

(3) dipping the cut aramid canvas to prepare a conveyer belt framework (framework layer 2) for later use;

(4) and (3) stacking the mixed rubber sheet of the lower covering layer rubber 14 and the mixed rubber sheet of the B transition layer rubber 13 according to the thickness requirement, then putting the framework layer 2, then stacking the mixed rubber sheet of the A transition rubber layer 12 and the mixed rubber sheet of the upper covering layer rubber 11 according to the thickness requirement, and finally vulcanizing and forming to obtain the product.

The steps of the method for preparing the rubber compound of the upper covering layer rubber 11 and the lower covering layer rubber 14 in the invention can be as follows:

s1, weighing each component according to a ratio; at the temperature below 50 ℃, adding chloroprene rubber, zinc oxide, magnesium oxide, sulfur, stearic acid, a plasticizer TCP and aromatic oil, and carrying out pressure mixing in an internal mixer for 120-150 s;

s2, adding carbon black N110 and a nanosphere lubricant, and mixing for 120-150 s or discharging when the temperature of an internal mixing chamber reaches 130-140 ℃; rolling and discharging the sheet by using an open mill, controlling the thickness to be 4.0 +/-0.2 mm, cooling and standing for 4 hours to obtain a sizing material A;

s3, heating the mixture in an internal mixing chamber to 50 ℃, putting the rubber material A, ammonium polyphosphate, chlorinated paraffin, antimony oxide, zinc borate, an accelerator TMTD, an accelerator DTDM and a scorch retarder into an internal mixer, mixing at low speed under pressure for 300-500 s, and discharging rubber;

s4, conducting guide refining and thin passing triangular packaging for 4-6 times by using an open mill, and controlling the thickness of the rubber sheet to be 0.4-0.6 mm; adjusting the roller spacing, controlling the thickness of the rubber sheet to be 4.0 +/-0.2 mm, rolling for 3-5 times by using left and right broaches, then discharging the rubber sheet, and standing for 24 hours at room temperature to obtain the mixed rubber sheet of the upper covering layer rubber 11 and the lower covering layer rubber 14.

The steps of the method for preparing the rubber sheet of the transition rubber layer a 12 and the transition rubber layer B13 in the present invention may be as follows:

s2, adding carbon black N326, and mixing for 120-150 s or discharging when the temperature of an internal mixing chamber reaches 130-140 ℃; rolling and discharging the sheet by using an open mill, controlling the thickness to be 2.0 +/-0.2 mm, cooling and standing for 4 hours to obtain a sizing material A;

s3, heating the internal mixing chamber to 50 ℃, putting the rubber material A, the ammonium polyphosphate, the accelerator TMTD, the accelerator DTDM and the scorch retarder into an internal mixer together, and discharging rubber after low-speed pressurization and mixing for 300-500 s;

s4, conducting guide refining and thin passing triangular packaging for 4-6 times by using an open mill, and controlling the thickness of the rubber sheet to be 0.2-0.6 mm; and adjusting the roller spacing, controlling the thickness of the rubber sheet to be 2.0 +/-0.2 mm, rolling the rubber sheet for 3-5 times by using left and right broaches, then discharging the rubber sheet, and standing the rubber sheet at room temperature for 24 hours to obtain the mixed rubber sheets of the transition rubber layer A12 and the transition rubber layer B13.

Example test data

The adhesion strength test data between the frame layer 2 and the connecting layer of the flame retardant conveyor belt made of the rubber of examples 1, 2, 3 and 4 of the present invention are as follows:

the above general description of the invention and the description of the specific embodiments thereof referred to in this application should not be construed as limiting the technical solutions of the invention. Those skilled in the art can add, reduce or combine the technical features disclosed in the general description and/or the embodiments to form other technical solutions within the protection scope of the present application without departing from the present disclosure.

The following is the details of the enterprise standard Q/ZJFF 001-.

Aramid fabric flame-retardant conveying belt for coal mine

1 range

The standard specifies the product model and specification, requirements, test method, inspection rules, marking, packaging, transporting and storing of the aramid fabric flame-retardant conveyor belt for the coal mine.

The standard is suitable for aramid fabric flame-retardant conveyor belts (hereinafter referred to as flame-retardant belts) used in coal mines.

2 normative citation document

The following documents are essential to the application of this document. All references to date are applicable to this document, only the date referenced version. Whatever the dateless reference file, its latest version (including all the amendments) applies to this document.

Determination of tensile Properties of GB/T528-2009 vulcanizates and thermoplastic rubbers

GB/T3512-2001 vulcanized rubber or thermoplastic rubber hot air accelerated aging and heat resistance test

GB/T3690-2009 test method for full-thickness tensile strength, elongation at break and reference force elongation of fabric core conveyor belt GB/T4490-1994 fabric core conveyor belt width and length

GB/T5752-2013 conveyer belt sign

Determination of the hardness of GB/T6031-1998 vulcanizates or thermoplastic rubbers

Method for measuring interlayer bonding strength of GB/T6759-2002 conveyer belt

General purpose fabric core conveyer belt with rubber or plastic covering layer for GB/T7984-2001 conveyer belt

Method for measuring wear resistance of GB/T9867-2008 vulcanized rubber or thermoplastic rubber through rotating roller type abrasion machine

MT318-1992 specification for joint inspection of flame retardant belts for coal mines

MT668-2008 steel wire rope core flame-retardant conveying belt for coal mine

MT830-2008 fabric laminated flame-retardant conveyor belt for coal mine

3 symbol

3.1 flame-retardant tape core Fabric Material symbol

D an aromatic polyamide fiber; e polyester fiber; p polyamide fiber.

4 product type and specification

4.1 Structure

The core body of the flame-retardant belt is composed of one or more layers of aramid fiber canvas (DPP or DEP for short) straight warp and straight weft fabrics, an upper fabric buffer layer and a lower fabric buffer layer. The core body layer is covered with a rubber covering layer.

4.2 product model

The product types were classified by machine direction tensile strength into 1250S, 1400S, 1600S, 1800S, 2000S, 2240S, 2500S, 2800S, 3150S, 3500S, 4000S, 4500S and | 5000S. An example of a specific model specification is shown in fig. 2:

5 requirement

5.1 appearance quality

The surface of the flame-retardant belt is smooth, and the defects of scars, gel deficiency, cracks, delamination, core exposure, heavy skin, sponge, transverse waves of the belt core layer and the like which influence the use requirement are avoided.

5.2 size

5.2.1 Width

The width tolerance of the flame-retardant conveyor belt should meet the specifications of Table 1

Table 1 tolerance units for flame retardant tapes: millimeter

5.2.2 Length of flame retardant tape

The factory length of the flame retardant belt is determined by negotiation between the supply and demand parties.

5.3 straightness

The straightness of the fire retardant tape should be no more than 25mm within 7 meters of tape length.

5.4 cover layer thickness

The thickness of the covering layer of the flame-retardant belt is determined by the negotiation of supply and demand parties, but the minimum nominal thickness is not less than 1.5 mm.

5.5 overlay Properties

Physical properties of the cover layer of the flame retardant tape are shown in Table 2

TABLE 2 physical Properties of the overlay

5.6 tensile Strength

The through-thickness tensile strength of the flame-retardant tape should meet the specifications of table 3.

Table 3 tensile strength units of flame retardant tapes: newton/mm

Model number

1250S

1400S

1600S

1800S

2000S

2240S

2500S

Longitudinal tensile strength not less than

1250

1400

1600

1800

2000

2240

2500

Transverse tensile strength is not less than

350

─

Model number

2800S

3150S

3500S

4000S

4500S

5000S

Longitudinal tensile strength not less than

2800

3150

3500

4000

4500

5000

Transverse tensile strength is not less than

─

5.7 interlayer adhesion Strength

The interlayer adhesion strength of the flame retardant tape should meet the requirements of table 4.

Table 4 flame retardant inter-tape adhesion strength units: newton/mm

5.8 joints

5.8.1 cloth layer joint

5.8.1.1 the fabric layer does not allow for transverse and longitudinal joints.

The 5.8.1.2 transverse joint of the buffer layer should be at 45-70 deg. to the central line of the belt.

5.8.1.3 buffer layer transverse joints are no more than 1 per 100 meters long of belt.

5.8.1.4 the distance between transverse joints of the same buffer layer is not less than 5 m.

5.8.1.5 the distance between transverse joints of different buffer layers is not less than 3 m.

5.8.2 flame retardant tape splice Strength

According to the requirements of MT830-2008 6.9.4.

5.9 flame retardant safety Properties

5.9.1 roller Friction test

The execution is carried out according to the requirement of 4.12 in MT 668-2008.

5.9.2 alcohol burner burning test

According to the requirements of MT830-2008 6.12.2.

5.9.3 roadway propane Combustion test

According to the requirements of MT830-2008 6.12.3.

5.9.4 surface resistance value

The method is executed according to the requirement of 6.11 in MT 830-2008.

6 test method

6.1 sample taking

After the sample is prepared for 24 hours, the sample is collected.

6.2 appearance quality

The visual inspection and the measuring tool are adopted for inspection.

6.3 measurement of dimensions

6.3.1 Width measurements were tested according to GB/T4490-1994.

6.3.2 Length measurements were tested according to GB/T4490-1994.

6.3.3 straightness measurement

The flame-retardant belt is unfolded and laid on a flat surface, two measuring points with the distance alpha are selected on the belt edge, when the belt length is more than 20m, the alpha is 7m, the distance from each point of the belt edge between two selected points to the point where the two points are connected into a straight line is measured, and the maximum distance and the straightness between the two points are measured.

6.3.4 cover layer thickness measurement

The method is carried out according to the method specified in MT830-2008 at 7.3.2.

6.4 measurement of physical and mechanical Properties of coating

6.4.1 tensile properties of the cover layers were tested according to GB/T528.

6.4.2 the ageing resistance of the coating was determined according to GB/T3512.

6.4.3 abrasion resistance of the coating was measured according to GB/T9867.

6.5 Total tensile Strength measurement

The method is carried out according to the method specified in MT830-2008 at 7.5.

6.6 interlayer adhesion Strength measurement

The test was carried out according to method A of GB/T6759-2002.

6.7 determination of the joint strength and the joint service life of the flame-retardant belt.

6.7.1 flame-retardant tape adhesive joint strength

During sampling, the distance between the test piece and the edge of the flame-retardant belt is not less than 50mm, the width of the sample is 250mm +/-25 mm, the length of the test piece is that a base band with the length of 1000mm is added at each of two ends of the length of the joint part of the glue joint, and the number of the test pieces is 3. The test is carried out by a horizontal tensile machine with the measuring range not less than 1000kN, and the test speed is 100mm/min +/-10 mm/min.

Determination of safety Properties of flame-retardant tape

6.7.2 roller friction test method

According to the method specified by 7.13 in MT668-2008

6.7.3 alcohol burner burning test method

The method is carried out according to the method specified in 7.14 in MT 830-2008.

6.7.4 roadway propane combustion test method

The method is carried out according to the method specified in MT830-2008 at 7.15.

6.7.5 surface resistance measuring method

The method is carried out according to the method specified in MT830-2008 at 7.12.

7 inspection rules

7.1 factory test

The product should be inspected by the quality inspection department of the manufacturing plant, and the product can be delivered after being inspected by taking 1000m as a batch (wherein the test is performed once every quarter after the coating is aged), inspected and issued with a certificate.

7.2 test items see Table 5.

7.3 type test

7.3.1 type test items are shown in Table 5.

TABLE 5 test items

7.3.2 in one of the following cases, a pattern check should be performed.

a) Trial production sizing identification when new products or old products are produced;

b) after formal production, if the structure, materials and process are changed greatly, the product performance can be influenced;

c) after the production of the product is stopped for 2 years, the production is resumed;

d) the national quality supervision agency puts forward the requirements for type inspection.

7.3.3 decision rules

7.3.3.1 qualification determination

a) All the items are qualified;

b) when only one important item is unqualified, taking another double sample to recheck the unqualified item and then to be qualified;

C) in general items, two items or less are not qualified, and double samples are taken to be qualified after rechecking.

7.3.3.2 fail determination

a) More than two (including) unqualified important items or more than three (including) unqualified general items;

b) important items, when only one item is unqualified, another double sample is taken to carry out rechecking on the unqualified item, and the unqualified item is still not qualified;

C) in general items, two items or less are not qualified, and the double samples are not qualified after being rechecked.

8 marking, packaging, transporting and storing

8.1 marks

Each fire-retardant belt should have a permanent mark with a font height of not less than 20mm every 10m in the longitudinal direction. The notation is shown in FIG. 3:

8.2 the fire-retardant tape is coiled by a wood core or an iron core, the binding is firm and neat, each piece of the fire-retardant tape is provided with a packaging covering, and the packaging is tied with a certificate issued by an inspection department.

8.3 the fire retardant belt should be kept clean during transportation and storage to avoid direct sunlight and rain and snow. Prevent contact with substances which affect the product quality, such as acid, alkali, oil, plasticizer, etc., and is far from the heat source by 1 m.

When the storehouse is stored at 8.4, the temperature in the storehouse is preferably kept between-10 ℃ and +40 ℃, and the relative humidity is preferably kept between 50% and 80%.

8.5 the fire retardant tapes should be stored in rolls without folding and turned over once a season during storage.

Claims

1. Aramid fabric skeleton flame retardant conveyor belt for coal mine, which is characterized in that: comprises a belt body (1) made of chloroprene rubber; the belt body (1) comprises an upper covering layer rubber (11), an A transition rubber layer (12), a B transition rubber layer (13) and a lower covering layer rubber (14) which are sequentially arranged from outside to inside, the thickness of the upper covering layer rubber (11) is 4-12 mm, and the thickness of the lower covering layer rubber (14) is 3-6 mm; a framework layer (2) is arranged between the transition rubber layer A (12) and the transition rubber layer B (13); the framework layer (2) is composed of a layer of aramid fiber canvas (21) and a gum dipping layer (22) coated on the outer surface of the aramid fiber canvas (21), the gum dipping layer (22) is formed by glue liquid formed by emulsifying natural rubber, and the thickness of the framework layer (2) is 2.5-6 mm; the raw material components of the upper covering layer rubber (11) and the lower covering layer rubber (14) contain flame retardant; the flame retardant is one or more of chlorinated paraffin, antimony oxide, zinc borate and ammonium polyphosphate;

the upper covering layer rubber (11) and the lower covering layer rubber (14) are the same in raw material components and comprise the following components in parts by weight:

100 parts of chloroprene rubber, 2-4 parts of zinc oxide,

2-4 parts of magnesium oxide, 4-6 parts of sulfur,

1-2 parts of stearic acid, 1-3 parts of plasticizer TCP,

3 to 5 parts of aromatic oil, 5 to 7 parts of anti-aging agent,

11030 to 50 portions of carbon black N, 0.2 to 0.3 portion of nanosphere lubricant,

3-5 parts of ammonium polyphosphate, 3-5 parts of chlorinated paraffin,

1.5 to 2.5 parts of antimony oxide, 1 to 2 parts of zinc borate,

1-3 parts of promoter TMTD, 1-3 parts of promoter DTDM,

0.4-0.6 part of anti-scorching agent CTP;

the preparation method of the rubber compound sheets of the upper covering layer rubber (11) and the lower covering layer rubber (14) comprises the following steps:

s4, conducting guide refining and thin passing triangular packaging for 4-6 times by using an open mill, and controlling the thickness of the rubber sheet to be 0.4-0.6 mm; adjusting the roll spacing, controlling the thickness of the rubber sheet to be 4.0 +/-0.2 mm, rolling for 3-5 times by using left and right broaches, then discharging the rubber sheet, and standing for 24 hours at room temperature to obtain a mixed rubber sheet of upper covering layer rubber (11) and lower covering layer rubber (14);

the transition rubber layer A (12) and the transition rubber layer B (13) are the same in raw material components and comprise the following components in parts by weight:

100 parts of chloroprene rubber, 2-4 parts of zinc oxide,

2-4 parts of magnesium oxide, 4-6 parts of sulfur,

1-2 parts of stearic acid, 1-3 parts of plasticizer TCP,

3 to 5 parts of aromatic oil, 5 to 7 parts of anti-aging agent,

carbon black N32625-40 parts, ammonium polyphosphate 3-5 parts,

5-10 parts of rubber adhesive RA, 1-3 parts of accelerant TMTD,

1-3 parts of an accelerator DTDM and 0.4-0.6 part of an anti-scorching agent CTP;

the preparation method of the mixed rubber sheet of the transition rubber layer A12 and the transition rubber layer B13 comprises the following steps:

s4, conducting guide refining and thin passing triangular packaging for 4-6 times by using an open mill, and controlling the thickness of the rubber sheet to be 0.2-0.6 mm; adjusting the roller spacing, controlling the thickness of the rubber sheet to be 2.0 +/-0.2 mm, rolling the rubber sheet for 3-5 times by using left and right broaches, then discharging the rubber sheet, and standing the rubber sheet at room temperature for 24 hours to obtain the mixed rubber sheet of the transition rubber layer A (12) and the transition rubber layer B (13).

2. The aramid fabric framework flame-retardant conveyor belt for the coal mine as claimed in claim 1, wherein the upper covering layer rubber (11) and the lower covering layer rubber (14) are prepared from the following raw materials in parts by weight:

100 parts of chloroprene rubber, 3 parts of zinc oxide,

3 parts of magnesium oxide, 5 parts of sulfur,

1.5 parts of stearic acid, 2 parts of plasticizer TCP,

4 parts of aromatic oil, 6 parts of anti-aging agent,

11040 portions of carbon black N, 0.25 portion of nanosphere lubricant,

4 parts of ammonium polyphosphate, 4 parts of chlorinated paraffin,

2 portions of antimony oxide, 1.5 portions of zinc borate,

2 portions of promoter TMTD, 2 portions of promoter DTDM,

0.5 part of antiscorching agent CTP.

3. The aramid fabric framework flame-retardant conveyor belt for the coal mine as claimed in claim 1, wherein the raw material components of the transition rubber layer A (12) and the transition rubber layer B (13) are the same and are as follows in parts by weight:

100 parts of chloroprene rubber, 3 parts of zinc oxide,

3 parts of magnesium oxide, 5 parts of sulfur,

1.5 parts of stearic acid, 2 parts of plasticizer TCP,

4 parts of aromatic oil, 6 parts of anti-aging agent,

carbon black N32635 parts, ammonium polyphosphate 4 parts,

7 parts of rubber adhesive RA, 2 parts of accelerant TMTD,

2 parts of accelerator DTDM and 0.5 part of antiscorching agent CTP.

4. The aramid fabric framework flame-retardant conveyor belt for the coal mine as claimed in claim 1, characterized in that: the thickness of the transition rubber layer A (12) is 20% -40% of that of the upper covering layer rubber (11), and the thickness of the transition rubber layer B (13) is 15% -30% of that of the lower covering layer rubber (14).

5. The aramid fabric framework flame-retardant conveyor belt for the coal mine as claimed in claim 1, characterized in that: the square meter dry weight of the framework layers (2) is 1000-4000 g/square meter.