A steel cord conveyor belt for TBM and a preparation method thereof

Abstract

The invention discloses a steel wire rope core conveyor belt for TBM and a preparation method thereof, comprising upper and lower covering rubber layers, a middle core rubber layer, an edge rubber layer, and a plurality of left and right directional steel wire ropes; the left and right directional steel wire ropes are arranged at intervals and distributed in the middle core rubber layer; the upper and lower covering rubber layers are respectively covered on the middle core rubber layer, and the left and right directional steel wire ropes are respectively covered on the edge rubber layer; the diameter of the left and right directional steel wire ropes in the middle part is 4-5mm and the spacing is 8-10mm; the diameter of the left and right directional steel wire ropes in the two side parts is 4-5mm and the spacing is 12-15mm; the left and right directional steel wire ropes in the middle part account for 60-70% of the width of the conveyor belt, and the left and right directional steel wire ropes in the two side parts account for 30-40% of the width of the conveyor belt. The conveyor belt of the invention has high strength, the diameter of the steel wire rope used under the same strength is small, the overall flexibility is strong, the elongation is low, the flame retardant safety performance is high, the conveying resistance is small, and it is not easy to deviate; the steel wire ropes on both sides have good troughing properties.

Description

Technical Field

[0001] The invention relates to a steel cord conveyor belt for TBM and a preparation method thereof. Background Art

[0002] TBM is the abbreviation of tunnel boring machine. The existing steel wire rope conveyor belts for TBM have the following disadvantages: 1. The diameter of the steel wire rope used is large, the breaking force is low, and the overall flexibility of the conveyor belt is poor; 2. The resistance of the steel wire rope conveyor belt is large, the power of the conveyor increases accordingly, and the power consumption increases; 3. The steel wire rope structure is single, the arrangement is uniform, and the steel wire ropes on both sides do not have good troughing properties, which is not suitable for slag discharge of tunnel boring machines. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a steel wire rope core conveyor belt for TBM and a preparation method thereof. The conveyor belt has high strength, and the diameter of the steel wire rope used at the same strength as that in the prior art is smaller, the overall flexibility is strong, the elongation is low, the flame retardant safety performance is high, the conveying resistance is small, it is not easy to deviate, and energy is saved; the steel wire ropes on both sides have good grooving properties.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a steel cord core conveyor belt for TBM, comprising upper and lower covering rubber layers, a middle core rubber layer, a side rubber layer, a plurality of left-direction steel ropes and a plurality of right-direction steel ropes; the left and right-direction steel ropes are arranged at intervals and distributed in the middle core rubber layer; the upper and lower covering rubber layers are respectively covered on the middle core rubber layer, and the left and right thereof are respectively covered on the side rubber layers; the diameter of the left and right-direction steel ropes in the middle part is 4-5mm and the spacing is 8-10mm; the diameter of the left and right-direction steel ropes in the two side parts is 4-5mm and the spacing is 12-15mm; the left and right-direction steel ropes in the middle part account for 60-70% of the width of the conveyor belt, and the left and right-direction steel ropes in the two side parts account for 30-40% of the width of the conveyor belt.

[0005] Further preferably, the upper covering rubber layer is made of wear-resistant, flame-retardant and antistatic covering rubber, and the lower covering rubber layer is made of covering rubber with low rolling resistance.

[0006] The method for manufacturing the steel cord conveyor belt for TBM mentioned above comprises the following steps:

[0007] 1. Prepare the upper and lower cover glue, middle core glue and edge glue:

[0008] A. Preparation of the upper cover rubber: It is made of the following raw materials, calculated by weight ratio: 30-40 natural rubber, 20-30 cis-1,4-butadiene rubber, 30-40 styrene-butadiene rubber, 30-35 medium carbon black, 2-3 terpene resin, 15-20 chlorinated paraffin, 3-6 zinc oxide, 1-2 accelerator CBS, 2-3 sulfur, 2-3 coupling agent FS-79A, 1-3 antioxidant 4010NA, 8 antimony oxide, 10-15 flame retardant IFR and 2-3 wear-resistant agent silicon 69; its preparation method comprises the following steps:

[0009] 1. Making a masterbatch: mixing the natural rubber, styrene-butadiene rubber, butadiene rubber and terpene resin in the weight ratio into a masterbatch in an internal mixer, with the speed of the internal mixer being 20 r / min, the pressure being 0.35 MPa, the mixing time being 3-4 min, and the discharge temperature being 110-115° C.; leaving the masterbatch for 8 hours;

[0010] 2. Prepare a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add the zinc oxide, accelerator CBS, antioxidant 4010NA and wear-resistant agent silicon 69 in the weight ratio, then add the antimony oxide and flame retardant IFR in the weight ratio, then add the medium-super carbon black in the weight ratio, and finally add the chlorinated paraffin in the weight ratio to mix into a first-stage rubber; the speed of the internal mixer is 30-35r / min, the pressure is 0.35MPA, the mixing time is 5-6min, the rubber discharge temperature is 140-145℃, and the first-stage rubber is parked for 8 hours;

[0011] 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add the sulfur in the weight ratio to mix into the upper covering rubber; the speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is 2-3min, and the discharge temperature is less than 90℃;

[0012] B. Prepare the lower cover rubber and edge rubber: the lower cover rubber and edge rubber are made of the following raw materials, calculated by weight ratio: 20-30 high vinyl polybutadiene rubber, 20-30 butadiene rubber, 30-40 natural rubber, 25-30 medium carbon black, 20-30 white carbon black, 3-5 terpene resin, 10-20 chlorinated paraffin, 5-6 zinc oxide, 1-2 accelerator NOBS, 2-3 sulfur, 2-3 coupling agent FS-79A, 2-3 antioxidant 4010NA, 5-8 antimony oxide, 10-15 flame retardant IFR and 2-3 wear resistant agent silicon 69; the preparation method comprises the following steps:

[0013] 1. Preparation of masterbatch: natural rubber, high vinyl polybutadiene rubber, butadiene rubber and terpene resin in the weight ratio are placed in an internal mixer and mixed into a masterbatch. The speed of the internal mixer is 20 r / min, the pressure is 0.35 MPa, the mixing time is 3-4 min, and the discharge temperature is 110-115° C. The masterbatch is left for 8 hours;

[0014] 2. Prepare a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add the zinc oxide, accelerator NOBS, antioxidant 4010NA and wear-resistant agent silicon 69 in the weight ratio, then add antimony oxide and flame retardant IFR in the weight ratio, then add medium super carbon black and white carbon black in the weight ratio, and finally add chlorinated paraffin in the weight ratio to mix into a first-stage rubber; the speed of the internal mixer is 30-35r / min, the pressure is 0.35MPA, the mixing time is 5-6min, the rubber discharge temperature is 140-145℃, and the first-stage rubber is parked for 8 hours;

[0015] 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add sulfur in the weight ratio to mix into the lower cover rubber and the edge rubber; the speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is 2-3min, and the discharge temperature is less than 90℃;

[0016] C. Preparation of intermediate core rubber: It is made of the following raw materials, calculated by weight ratio: 40-50% of styrene-butadiene rubber, 20-30% of nitrile rubber, 10-20% of natural rubber, 20-30% of medium carbon black, 3-5% of phenolic resin, 15-20% of chlorinated paraffin, 3-6% of zinc oxide, 1-2% of magnesium oxide, 1-2% of accelerator NOBS, 2-3% of sulfur, 1-3% of cobalt salt, 7-10% of white carbon black, 3-5% of adhesive HE, 15-20% of aluminum hydroxide, 5-8% of antimony oxide, 15-20% of flame retardant IFR, 1-3% of coupling agent FS-79A, and 1-3% of antioxidant MB; its preparation method comprises the following steps:

[0017] 1. Making a masterbatch: mixing the natural rubber, styrene-butadiene rubber, nitrile rubber, phenolic resin and cobalt salt in the weight ratio into a masterbatch in an internal mixer, with the speed of the internal mixer being 20 r / min, the pressure being 0.35 MPa, the mixing time being 3-4 min, and the discharge temperature being 110-115° C.; leaving the masterbatch for 8 hours;

[0018] 2. Making a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add the zinc oxide, accelerator NOBS, antioxidant MB, coupling agent FS-79A and magnesium oxide in the weight ratio, then add antimony oxide, aluminum hydroxide and flame retardant IFR in the weight ratio, then add medium super carbon black and white carbon black in the weight ratio, and finally add chlorinated paraffin in the weight ratio to make a first-stage rubber. The speed of the internal mixer is 30-35r / min, the pressure is 0.35MPA, the mixing time is 5-6min, the rubber discharge temperature is 140-145℃, and the first-stage rubber is parked for 8 hours;

[0019] 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add the sulfur in the weight ratio to mix into the intermediate core rubber; the speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is 2-3min, and the discharge temperature is less than 90℃;

[0020] Second, firstly, use a calender to make the upper and lower covering rubber, edge rubber and middle core rubber into upper and lower covering rubber layers, edge rubber layers and middle core rubber layers; then, the upper covering rubber layer, the lower covering rubber layer, the edge rubber layer, the middle core rubber layer, the left and right directional steel wire ropes are bonded together according to the arrangement and spacing described;

[0021] 3. Vulcanization process: vulcanize the formed TBM steel cord conveyor belt at a temperature of 150°C and a pressure of 2.5Mpa. During vulcanization, cellophane needs to be added between the upper and lower hot plates and the belt blank.

[0022] The twist direction of the steel wire rope used for the conveyor belt of the present invention is arranged alternately in the left and right twist directions, which can ensure that the tension of the steel wire rope is consistent, the conveyor belt does not deviate, and the strength is high. The diameter of the steel wire rope used at the same strength as the prior art is smaller, and the overall flexibility is strong, ensuring the low elongation of the steel wire rope core conveyor belt and the full penetration of the core rubber. The reinforcement system composed of coupling agent FS-79A, butadiene rubber, and medium super carbon black used in the upper cover rubber ensures the wear resistance of the upper cover rubber layer, and the flame retardant system of antimony oxide, flame retardant IFR and chlorinated paraffin achieves flame retardant performance, that is, the upper cover rubber adopts a super wear-resistant flame retardant antistatic rubber formula to ensure the wear resistance and safety performance of the conveyor belt, and the use in a relatively closed tunnel with poor air flow ensures the safety of construction. The vinyl in the high vinyl polybutadiene rubber and the accelerator NOBS and white carbon black in the lower cover rubber form a three-dimensional network elastic structure, which increases the resilience of the rubber and reduces the resistance of the conveyor belt during operation. The lower cover rubber layer uses a rubber formula with low rolling resistance to ensure that the resistance of the conveyor belt is minimal during operation and save energy. The steel wire rope arrangement adopts a special part dense arrangement structure to ensure that the steel wire ropes are dense in the middle part where there is material to prevent the conveyor belt from being punctured; the steel wire ropes on both sides are sparsely arranged to ensure that the conveyor belt has good troughing properties.

[0023] In summary, the conveyor belt of the present invention has high strength, and the diameter of the steel wire rope used at the same strength as that of the prior art is smaller, the overall flexibility is strong, the elongation is low, the flame retardant safety performance is high, the conveying resistance is small, it is not easy to deviate, and energy is saved; the steel wire ropes on both sides have good grooving properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention after being cut along the width direction of the conveyor belt;

[0025] Figure 2 It is a structural schematic diagram of the left-hand wire rope in the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the right-hand wire rope in the present invention;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment includes upper and lower covering rubber layers 2 and 3, a middle core rubber layer 6, an edge rubber layer 1, a plurality of left-oriented steel wire ropes 4 and a plurality of right-oriented steel wire ropes 5. The left-oriented steel wire ropes 4 and 5 are arranged and distributed in the middle core rubber layer 6 at intervals. The upper and lower parts of the middle core rubber layer 6 are respectively covered with the upper and lower covering rubber layers 2 and 3, and the left and right parts are respectively covered with the edge rubber layer 1. The diameter of the left and right-oriented steel wire ropes 4 and 5 in the middle part is any value of 4-5mm, and the spacing is any value of 8-10mm. The diameter of the left and right-oriented steel wire ropes 4 and 5 in the two side parts is any value of 4-5mm, and the spacing is any value of 12-15mm. The left and right wire ropes 4 and 5 in the middle part account for 60%, 62%, 66%, 68% or 70% of the width of the conveyor belt, and the left and right wire ropes 4 and 5 on both sides account for 40%, 38%, 34%, 32% or 30% of the width of the conveyor belt. Preferably, the upper cover rubber layer 2 is made of wear-resistant, flame-retardant and antistatic upper cover rubber, and the lower cover rubber layer 3 is made of low rolling resistance lower cover rubber. Preferably, the steel wire rope is 6*6-1WSC steel wire rope.

[0030] The method for manufacturing the steel cord conveyor belt for TBM mentioned above comprises the following steps:

[0031] 1. Prepare the upper and lower cover glue, middle core glue and edge glue:

[0032] A. Preparation of the upper cover rubber: It is made of the following raw materials, calculated by weight ratio: 30-40% of natural rubber, 20-30% of cis-1,4-butadiene rubber, 30-40% of styrene-butadiene rubber, 30-35% of medium carbon black, 2-3% of terpene resin, 15-20% of chlorinated paraffin, 3-6% of zinc oxide, 1-2% of accelerator CBS, 2-3% of sulfur, 2-3% of coupling agent FS-79A, 1-3% of antioxidant 4010NA, 8% of antimony oxide, 10-15% of flame retardant IFR and 2-3% of wear-resistant agent silicon 69. Its preparation method comprises the following steps:

[0033] 1. Preparation of masterbatch: natural rubber, styrene-butadiene rubber, butadiene rubber and terpene resin in the weight ratio are placed in an internal mixer and mixed into a masterbatch. The speed of the internal mixer is 20 r / min, the pressure is 0.35 MPA, the mixing time is any value between 3 and 4 minutes, and the discharge temperature is any value between 110 and 115°C. The masterbatch is stored for 8 hours.

[0034] 2. Prepare a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add zinc oxide, accelerator CBS, antioxidant 4010NA and wear-resistant agent silicon 69 in the weight ratio, then add antimony oxide and flame retardant IFR in the weight ratio, then add medium-super carbon black in the weight ratio, and finally add chlorinated paraffin in the weight ratio to mix into a first-stage rubber; the speed of the internal mixer is any value of 30-35r / min, the pressure is 0.35MPA, the mixing time is any value of 5-6min, the rubber discharge temperature is any value of 140-145℃, and the first-stage rubber is parked for 8 hours.

[0035] 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add sulfur in the weight ratio to mix into the upper covering rubber; the speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is any value between 2-3min, and the discharge temperature is less than 90℃.

[0036] B. Preparation of lower cover rubber and edge rubber: the lower cover rubber and edge rubber are made of the following raw materials, calculated by weight ratio: 20-30% of high vinyl polybutadiene rubber, 20-30% of butadiene rubber, 30-40% of natural rubber, 25-30% of medium carbon black, 20-30% of white carbon black, 3-5% of terpene resin, 10-20% of chlorinated paraffin, 5-6% of zinc oxide, 1-2% of accelerator NOBS, 2-3% of sulfur, 2-3% of coupling agent FS-79A, 2-3% of antioxidant 4010NA, 5-8% of antimony oxide, 10-15% of flame retardant IFR and 2-3% of wear-resistant agent silicon 69. The preparation method comprises the following steps:

[0037] 1. Preparation of masterbatch: natural rubber, high vinyl polybutadiene rubber, butadiene rubber and terpene resin in the weight ratio are placed in an internal mixer and mixed into a masterbatch. The speed of the internal mixer is 20 r / min, the pressure is 0.35 MPa, the mixing time is any value between 3 and 4 minutes, and the discharge temperature is any value between 110 and 115° C.; the masterbatch is left for 8 hours.

[0038] 2. Prepare a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add the zinc oxide, accelerator NOBS, antioxidant 4010NA and wear-resistant agent silicon 69 in the weight ratio, then add the antimony oxide and flame retardant IFR in the weight ratio, then add the medium super carbon black and white carbon black in the weight ratio, and finally add the chlorinated paraffin in the weight ratio to mix into a first-stage rubber; the speed of the internal mixer is any value of 30-35r / min, the pressure is 0.35MPA, the mixing time is any value of 5-6min, the rubber discharge temperature is any value of 140-145℃, and the first-stage rubber is parked for 8 hours;

[0039] 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add the sulfur in the weight ratio to mix into the lower cover rubber and the edge rubber. The speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is any value between 2-3min, and the discharge temperature is less than 90℃.

[0040] C. Preparation of intermediate core rubber: It is made of the following raw materials, calculated by weight ratio: 40-50 styrene-butadiene rubber, 20-30 nitrile rubber, 10-20 natural rubber, 20-30 medium carbon black, 3-5 phenolic resin, 15-20 chlorinated paraffin, 3-6 zinc oxide, 1-2 magnesium oxide, 1-2 accelerator NOBS, 2-3 sulfur, 1-3 cobalt salt, 7-10 white carbon black, 3-5 adhesive HE, 15-20 aluminum hydroxide, 5-8 antimony oxide, 15-20 flame retardant IFR, 1-3 coupling agent FS-79A, 1-3 antioxidant MB. Its preparation method includes the following steps:

[0041] 1. Preparation of masterbatch: natural rubber, styrene-butadiene rubber, nitrile rubber, phenolic resin and cobalt salt in the weight ratio are placed in an internal mixer and mixed into a masterbatch. The speed of the internal mixer is 20 r / min, the pressure is 0.35 MPA, the mixing time is any value between 3 and 4 minutes, and the discharge temperature is any value between 110 and 115° C. The masterbatch is left for 8 hours.

[0042] 2. Prepare a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add zinc oxide, accelerator NOBS, antioxidant MB, coupling agent FS-79A and magnesium oxide in the weight ratio, then add antimony oxide, aluminum hydroxide and flame retardant IFR in the weight ratio, then add medium super carbon black and white carbon black in the weight ratio, and finally add chlorinated paraffin in the weight ratio to make a first-stage rubber. The speed of the internal mixer is any value in the range of 30-35r / min, the pressure is 0.35MPA, the mixing time is any value in the range of 5-6min, the discharge temperature is any value in the range of 140-145°C, and the first-stage rubber is parked for 8 hours.

[0043] 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add the sulfur in the weight ratio to mix into the middle core rubber. The speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is any value between 2-3min, and the discharge temperature is less than 90℃.

[0044] 2. First, use a calender to make the upper and lower covering rubber, edge rubber and middle core rubber into upper and lower covering rubber layers, edge rubber layers and middle core rubber layers of required width and thickness; then fit the upper covering rubber layer, lower covering rubber layer, edge rubber layer, middle core rubber layer, left and right directional steel wire ropes together according to the described arrangement and spacing.

[0045] 3. Vulcanization process: vulcanize the formed TBM steel cord conveyor belt at a temperature of 150°C and a pressure of 2.5Mpa. During vulcanization, cellophane needs to be added between the upper and lower hot plates and the belt blank.

[0046] The above embodiments are only preferred and exemplary. Those skilled in the art can perform equivalent technologies according to the description of this patent. These improvements belong to equivalent technical improvements and are covered by the protection scope of this patent.

Claims

1. A steel cord conveyor belt for TBM, characterized by: It includes upper and lower covering rubber layers, middle core rubber layer, side rubber layer, multiple left-direction steel wire ropes and multiple right-direction steel wire ropes; the left-direction steel wire ropes are arranged at intervals in the middle core rubber layer; the upper and lower covering rubber layers are respectively covered on the middle core rubber layer, and the left and right are respectively covered on the side rubber layer; the diameter of the left and right steel wire ropes in the middle part is 4-5mm, and the spacing is 8-10mm; the diameter of the left and right steel wire ropes in the two side parts is 4-5mm, and the spacing is 12-15mm; the left and right steel wire ropes in the middle part account for 60-70% of the width of the conveyor belt, and the left and right steel wire ropes in the two side parts account for 30-40% of the width of the conveyor belt; The upper cover rubber is made of the following raw materials, calculated by weight ratio: 30-40 natural rubber, 20-30 cis-1,4-butadiene rubber, 30-40 styrene-butadiene rubber, 30-35 medium carbon black, 2-3 terpene resin, 15-20 chlorinated paraffin, 3-6 zinc oxide, 1-2 accelerator CBS, 2-3 sulfur, 2-3 coupling agent FS-79A, 1-3 antioxidant 4010NA, 8 antimony oxide, 10-15 flame retardant IFR and 2-3 wear-resistant agent silicon 69; The lower cover rubber and edge rubber are made of the following raw materials, calculated by weight ratio: 20-30 high vinyl polybutadiene rubber, 20-30 butadiene rubber, 30-40 natural rubber, 25-30 medium super carbon black, 20-30 white carbon black, 3-5 terpene resin, 10-20 chlorinated paraffin, 5-6 zinc oxide, 1-2 accelerator NOBS, 2-3 sulfur, 2-3 coupling agent FS-79A, 2-3 antioxidant 4010NA, 5-8 antimony oxide, 10-15 flame retardant IFR and 2-3 wear-resistant agent silicon 69; The intermediate core rubber is made of the following raw materials, calculated by weight ratio: 40-50% of styrene-butadiene rubber, 20-30% of nitrile rubber, 10-20% of natural rubber, 20-30% of medium-super carbon black, 3-5% of phenolic resin, 15-20% of chlorinated paraffin, 3-6% of zinc oxide, 1-2% of magnesium oxide, 1-2% of accelerator NOBS, 2-3% of sulfur, 1-3% of cobalt salt, 7-10% of white carbon black, 3-5% of adhesive HE, 15-20% of aluminum hydroxide, 5-8% of antimony oxide, 15-20% of flame retardant IFR, 1-3% of coupling agent FS-79A, and 1-3% of antioxidant MB.

2. The steel cord conveyor belt for TBM according to claim 1, characterized in that: The upper covering rubber layer is made of wear-resistant, flame-retardant and antistatic covering rubber, and the lower covering rubber layer is made of covering rubber with low rolling resistance.

3. A method for preparing a steel cord conveyor belt for TBM according to claim 1 or 2, characterized in that: It includes the following steps:

1. Prepare the upper and lower cover glue, middle core glue and edge glue: A. Preparation of the upper cover rubber: It is made of the following raw materials, calculated by weight ratio: 30-40 natural rubber, 20-30 cis-1,4-butadiene rubber, 30-40 styrene-butadiene rubber, 30-35 medium carbon black, 2-3 terpene resin, 15-20 chlorinated paraffin, 3-6 zinc oxide, 1-2 accelerator CBS, 2-3 sulfur, 2-3 coupling agent FS-79A, 1-3 antioxidant 4010NA, 8 antimony oxide, 10-15 flame retardant IFR and 2-3 wear-resistant agent silicon 69; its preparation method comprises the following steps:

1. Making a masterbatch: mixing the natural rubber, styrene-butadiene rubber, butadiene rubber and terpene resin in the weight ratio into a masterbatch in an internal mixer, with the speed of the internal mixer being 20 r / min, the pressure being 0.35 MPa, the mixing time being 3-4 min, and the discharge temperature being 110-115° C.; leaving the masterbatch for 8 hours; 2. Prepare a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add the zinc oxide, accelerator CBS, antioxidant 4010NA and wear-resistant agent silicon 69 in the weight ratio, then add the antimony oxide and flame retardant IFR in the weight ratio, then add the medium-super carbon black in the weight ratio, and finally add the chlorinated paraffin in the weight ratio to mix into a first-stage rubber; the speed of the internal mixer is 30-35r / min, the pressure is 0.35MPA, the mixing time is 5-6min, the rubber discharge temperature is 140-145℃, and the first-stage rubber is parked for 8 hours; 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add the sulfur in the weight ratio to mix into the upper covering rubber; the speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is 2-3min, and the discharge temperature is less than 90℃; B. Prepare the lower cover rubber and edge rubber: the lower cover rubber and edge rubber are made of the following raw materials, calculated by weight ratio: 20-30 high vinyl polybutadiene rubber, 20-30 butadiene rubber, 30-40 natural rubber, 25-30 medium carbon black, 20-30 white carbon black, 3-5 terpene resin, 10-20 chlorinated paraffin, 5-6 zinc oxide, 1-2 accelerator NOBS, 2-3 sulfur, 2-3 coupling agent FS-79A, 2-3 antioxidant 4010NA, 5-8 antimony oxide, 10-15 flame retardant IFR and 2-3 wear resistant agent silicon 69; the preparation method comprises the following steps:

1. Preparation of masterbatch: natural rubber, high vinyl polybutadiene rubber, butadiene rubber and terpene resin in the weight ratio are placed in an internal mixer and mixed into a masterbatch. The speed of the internal mixer is 20 r / min, the pressure is 0.35 MPa, the mixing time is 3-4 min, and the discharge temperature is 110-115° C. The masterbatch is left for 8 hours; 2. Prepare a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add the zinc oxide, accelerator NOBS, antioxidant 4010NA and wear-resistant agent silicon 69 in the weight ratio, then add antimony oxide and flame retardant IFR in the weight ratio, then add medium super carbon black and white carbon black in the weight ratio, and finally add chlorinated paraffin in the weight ratio to mix into a first-stage rubber; the speed of the internal mixer is 30-35r / min, the pressure is 0.35MPA, the mixing time is 5-6min, the rubber discharge temperature is 140-145℃, and the first-stage rubber is parked for 8 hours; 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add sulfur in the weight ratio to mix into the lower cover rubber and the edge rubber; the speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is 2-3min, and the discharge temperature is less than 90℃; C. Preparation of intermediate core rubber: It is made of the following raw materials, calculated by weight ratio: 40-50% of styrene-butadiene rubber, 20-30% of nitrile rubber, 10-20% of natural rubber, 20-30% of medium carbon black, 3-5% of phenolic resin, 15-20% of chlorinated paraffin, 3-6% of zinc oxide, 1-2% of magnesium oxide, 1-2% of accelerator NOBS, 2-3% of sulfur, 1-3% of cobalt salt, 7-10% of white carbon black, 3-5% of adhesive HE, 15-20% of aluminum hydroxide, 5-8% of antimony oxide, 15-20% of flame retardant IFR, 1-3% of coupling agent FS-79A, and 1-3% of antioxidant MB; its preparation method comprises the following steps:

1. Making a masterbatch: mixing the natural rubber, styrene-butadiene rubber, nitrile rubber, phenolic resin and cobalt salt in the weight ratio into a masterbatch in an internal mixer, with the speed of the internal mixer being 20 r / min, the pressure being 0.35 MPa, the mixing time being 3-4 min, and the discharge temperature being 110-115° C.; leaving the masterbatch for 8 hours; 2. Making a first-stage rubber: first add the masterbatch after being parked for 8 hours in an internal mixer, then add the zinc oxide, accelerator NOBS, antioxidant MB, coupling agent FS-79A and magnesium oxide in the weight ratio, then add antimony oxide, aluminum hydroxide and flame retardant IFR in the weight ratio, then add medium super carbon black and white carbon black in the weight ratio, and finally add chlorinated paraffin in the weight ratio to make a first-stage rubber. The speed of the internal mixer is 30-35r / min, the pressure is 0.35MPA, the mixing time is 5-6min, the rubber discharge temperature is 140-145℃, and the first-stage rubber is parked for 8 hours; 3. Second stage mixing: add the first stage rubber after being parked for 8 hours into the internal mixer, and then add the sulfur in the weight ratio to mix into the intermediate core rubber; the speed of the internal mixer is 20r / min, the pressure is 0.3MPA, the mixing time is 2-3min, and the discharge temperature is less than 90℃; 2. First, use a calender to make the upper and lower covering rubbers, edge rubbers and middle core rubbers into upper and lower covering rubber layers, edge rubber layers and middle core rubber layers; then, the upper covering rubber layer, the lower covering rubber layer, the edge rubber layer, the middle core rubber layer, the left and right directional steel wire ropes are bonded together according to the arrangement and spacing described in claim 1; 3. Vulcanization process: vulcanize the formed TBM steel cord conveyor belt at a temperature of 150°C and a pressure of 2.5Mpa. During vulcanization, cellophane needs to be added between the upper and lower hot plates and the belt blank.

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