阅读说明：本技术 一种矿用缆绳及其制备方法 (Mining mooring rope and preparation method thereof ) 是由 廖秋慧 曹熹 吴声龙 黄涛 卢毅 吴翔 于 2021-10-11 设计创作，主要内容包括：本发明属于矿用设备的技术领域,公开了一种矿用缆绳的制备方法,采用二次成型工艺,由牵引机构带动芯线依次同轴穿过粘合剂挤出机、保护套挤出机,使粘合剂、保护套依次均匀包裹在芯线的表面,确保芯线和保护套之间充分粘合。采用二次成型工艺,在芯线的表面增设粘合剂,提高芯线和保护套之间的粘合力,以防止在较高的应力下不会发生脱胶开裂的现象,从而使生产出来的缆绳能够满足工业生产中的实际要求,以扩大应用范围。(The invention belongs to the technical field of mining equipment, and discloses a preparation method of a mining cable. The secondary forming process is adopted, the adhesive is additionally arranged on the surface of the core wire, the adhesive force between the core wire and the protective sleeve is improved, the phenomenon of degumming and cracking can be prevented under higher stress, and therefore the produced cable rope can meet the actual requirements in industrial production, and the application range is expanded.)

1. A preparation method of a mining cable is characterized by comprising the following steps: and a secondary forming process is adopted, the core wire is driven by the traction mechanism to sequentially and coaxially pass through the adhesive extruder and the protective sleeve extruder, so that the adhesive and the protective sleeve are sequentially and uniformly coated on the surface of the core wire, and the core wire and the protective sleeve are fully bonded.

2. The method for preparing a mining cable as claimed in claim 1, wherein: the adhesive is heated to a molten state by an adhesive extruder, and then is extruded and coated on the surface of the core wire, and then the core wire coated with the adhesive in the molten state enters a protective sleeve extruder.

3. The method for preparing a mining cable as claimed in claim 2, wherein: the adhesive is set to be hot melt adhesive, and the wall thickness of the hot melt adhesive wrapped on the surface of the core wire is set to be 0.2-0.3 mm.

4. The method for preparing a mining cable as claimed in claim 2, wherein: the core wire comprises a plurality of strands of ultra-high molecular weight polyethylene fiber ropes, and is uniformly soaked in a polyurethane coating solution before entering an adhesive extruder and then dried.

5. The method for preparing a mining cable as claimed in claim 4, wherein: the concentration of the polyurethane coating solution is 1: 200-300, and contains inorganic filler sol-phase nano SiO₂The sol nano SiO₂Is less than 2 wt%.

6. The method for preparing the mining cable as claimed in claim 4, characterized by comprising the following steps:

step one, driving a core wire to pass through a water tank containing a polyurethane coating solution at a constant speed by a traction mechanism, uniformly soaking the core wire in the water tank for 10 to 15 seconds, and then drying the core wire in a dryer at the drying temperature lower than 80 ℃;

secondly, putting raw material particles of the hot melt adhesive into an adhesive extruder, heating the raw material particles to a molten state, then driving the dried core wire into the adhesive extruder by a traction mechanism, and extruding the hot melt adhesive in the molten state by the adhesive extruder and uniformly coating the hot melt adhesive on the surface of the core wire;

and step three, putting the raw material particles of the protective sleeve into a protective sleeve extruder, heating to a molten state, then driving the coated core wire to enter the protective sleeve extruder by a traction mechanism, and extruding the protective sleeve solution in the molten state by the protective sleeve extruder and uniformly coating the solution on the surface of the core wire.

7. The method for preparing a mining cable as claimed in claim 6, wherein: the parameters of the adhesive extruder were set as: extruding at 70 deg.C in the feeding zone, 80 deg.C in the heating zone 1, 90 deg.C in the heating zone 2, 110 deg.C in the heating zone 3, 175 deg.C in the neck zone, 180 deg.C in the head zone, and 175 deg.C in the die sleeve zone under 2.5-3.5 MPa;

the parameters of the protective sleeve extruder are set as follows: extruding at a feeding zone of 100 ℃, a heating zone 1 of 110 ℃, a heating zone 2 of 150 ℃, a heating zone 3 of 160 ℃, a machine neck zone of 180 ℃, a machine head zone of 185 ℃ and a die sleeve zone of 180 ℃ under the pressure of 4.5-5.5 MPa;

and a plurality of vibration motors are arranged in the water tank and used for uniformly mixing the polyurethane coating solution through vibration.

8. The mining cable rope based on the preparation method of the mining cable rope as claimed in claim 1, characterized in that: including the heart yearn the surface of heart yearn wraps up in proper order has adhesive layer, protective sheath layer, the adhesive layer is used for improving the adhesive force between protective sheath layer and the heart yearn.

Technical Field

The invention relates to the technical field of mining equipment, in particular to a mining mooring rope and a preparation method thereof.

Background

The cable used in industrial production is generally made of synthetic fiber braided cable, which is mostly made of nylon, polypropylene, vinylon, terylene, etc., although the cable is mature in production process, the mechanical properties of the cable have certain limitations. The UHMWPE fiber is a new material, the product processed by it has the advantages of corrosion resistance, mildew and rot resistance, and worm-eating resistance besides light specific gravity, high strength, good impact resistance and wear resistance, although the application is increasingly wide, the application of UHMWPE fiber cable instead of widely applied steel wire rope in mine oil field hoisting equipment is less at present, in addition, due to its special physical and chemical properties, the requirement on the production process of cable is higher, at present, in the oil field production industry, in order to make the cable have better corrosion resistance effect, and the service life is prolonged, a layer of protective sleeve is usually added outside, but when the cable in oil field is used to hoist heavy objects, the outer protective sleeve is easy to come unstuck and lose efficacy due to the stress.

Disclosure of Invention

The invention provides a mining cable and a preparation method thereof, which adopt a secondary forming process, add an adhesive on the surface of a core wire, improve the adhesive force between the core wire and a protective sleeve, and prevent the phenomenon of degumming and cracking under higher stress, so that the produced cable can meet the actual requirements in industrial production, and the application range is expanded.

The invention can be realized by the following technical scheme:

a preparation method of a mining mooring rope adopts a secondary forming process, and a core wire is driven by a traction mechanism to sequentially and coaxially pass through an adhesive extruder and a protective sleeve extruder, so that the adhesive and the protective sleeve are sequentially and uniformly coated on the surface of the core wire, and the core wire and the protective sleeve are ensured to be fully bonded.

Further, the adhesive is heated to a molten state through an adhesive extruder, and then is extruded to wrap the surface of the core wire, and then the core wire wrapped with the adhesive in the molten state enters a sheath extruder.

Further, the adhesive is set to be hot melt adhesive, and the wall thickness of the hot melt adhesive wrapped on the surface of the core wire is set to be 0.2-0.3 mm.

Further, the core wire comprises a plurality of strands of ultra-high molecular weight polyethylene fiber ropes, and before entering the adhesive extruder, the core wire is uniformly soaked in the polyurethane coating solution and then dried.

Further, the concentration of the polyurethane coating solution is in the range of 1: 200-300, and contains inorganic filler sol-phase nano SiO₂The sol nano SiO₂Is less than 2 wt%.

Further, the method comprises the following steps:

step one, driving a core wire to pass through a water tank containing a polyurethane coating solution at a constant speed by a traction mechanism, uniformly soaking the core wire in the water tank for 10 to 15 seconds, and then drying the core wire in a dryer at the drying temperature lower than 80 ℃;

secondly, putting raw material particles of the hot melt adhesive into an adhesive extruder, heating the raw material particles to a molten state, then driving the dried core wire into the adhesive extruder by a traction mechanism, and extruding the hot melt adhesive in the molten state by the adhesive extruder and uniformly coating the hot melt adhesive on the surface of the core wire;

and step three, putting the raw material particles of the protective sleeve into a protective sleeve extruder, heating to a molten state, then driving the coated core wire to enter the protective sleeve extruder by a traction mechanism, and extruding the protective sleeve solution in the molten state by the protective sleeve extruder and uniformly coating the solution on the surface of the core wire.

Further, the parameters of the adhesive extruder were set as: extruding at 70 deg.C in the feeding zone, 80 deg.C in the heating zone 1, 90 deg.C in the heating zone 2, 110 deg.C in the heating zone 3, 175 deg.C in the neck zone, 180 deg.C in the head zone, and 175 deg.C in the die sleeve zone under 2.5-3.5 MPa;

the parameters of the protective sleeve extruder are set as follows: extruding at a feeding zone of 100 ℃, a heating zone 1 of 110 ℃, a heating zone 2 of 150 ℃, a heating zone 3 of 160 ℃, a machine neck zone of 180 ℃, a machine head zone of 185 ℃ and a die sleeve zone of 180 ℃ under the pressure of 4.5-5.5 MPa;

and a plurality of vibration motors are arranged in the water tank and used for uniformly mixing the polyurethane coating solution through vibration.

The mining cable based on the preparation method of the mining cable comprises a core wire, wherein the surface of the core wire is sequentially wrapped with an adhesive layer and a protective sleeve layer, and the adhesive layer is used for improving the adhesive force between the protective sleeve layer and the core wire.

The beneficial technical effects of the invention are as follows:

the invention provides a secondary extrusion molding process method, a production line designed by the method has reasonable structure and is suitable for streamlined production, and products produced by the method can effectively prevent the phenomena of degumming and cracking of the mooring rope, improve the product quality of the mooring rope and have stronger applicability.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention;

FIG. 2 is a schematic view of a process line of the present invention;

wherein, the production process comprises the steps of 1-core wire, 2-water tank, 3-dryer, 4-adhesive extruder and 5-protective sleeve extruder.

Detailed Description

The following detailed description of the preferred embodiments will be made with reference to the accompanying drawings.

As shown in figures 1 and 2, the invention provides a preparation method of a mining mooring rope, which adopts a secondary forming process, a core wire is driven by a traction mechanism to sequentially and coaxially pass through an adhesive extruder and a protective sleeve extruder, so that the adhesive and the protective sleeve are sequentially and uniformly wrapped on the surface of the core wire, the core wire and the protective sleeve are ensured to be fully bonded, the bonding force between the core wire and the protective sleeve is improved, the phenomenon of degumming and cracking can not occur under higher stress, and the produced mooring rope can meet the actual requirements in industrial production so as to expand the application range.

Firstly, a core wire is driven to move by a traction mechanism such as a drum tractor in the whole production process, in order to ensure the coaxiality, a support frame with a pulley is arranged between two extruders to prevent the passing core wire from deforming, and each extruder is arranged on a base capable of adjusting the height, so that the height of the two extruders can be conveniently adjusted;

secondly, the core wire is formed by winding a plurality of strands of ultrahigh molecular weight polyethylene fiber ropes, and the ultrahigh molecular weight polyethylene is a high polymer, so that the core wire is soaked in a polyurethane high polymer solution before extrusion to improve the melting temperature of the ultrahigh density polyethylene in order to prevent the deformation of the core wire caused by overhigh extrusion temperature in the subsequent extrusion process;

finally, the specific method is as follows:

1. the traction mechanism drives the core wire to be evenly soaked through the polyurethane coating solution water tank 2, and the concentration of the polyurethane coating solution is 1: 200-300, soaking for about 10-15 seconds. Because the polyurethane is dispersed in water and is easy to precipitate, in order to prevent the uneven soaking of the mooring rope, two vibration motors are arranged at the bottom of the water tank, so that the polyurethane and the water can be conveniently mixed; meanwhile, in order to easily perform surface amination treatment on the core wire and activate the surface energy of the core wire, sol-state nano SiO dispersed in a solvent is added into the solution₂The combination degree of polyethylene polymer molecules in the core wire and polyurethane polymer monomers in the polyurethane solution is further improved, the addition content of the polyethylene polymer molecules in the core wire is controlled to be lower than 2 wt%, and the nano SiO is dispersed as efficiently as possible₂Thereby mixing the nano particles fully and uniformly.

2. The core wire after being soaked uniformly passes through a dryer 3 and is dried in the environment of not higher than 80 ℃ for about 4-5 seconds so as to evaporate the water in the polyurethane solution and enhance the hardness of the cable rope and the bonding strength among the strands of fiber ropes, and the molecule chain segments are difficult to move during heating due to the entanglement among the polymer molecules in the interior of the cable rope, so that the melting temperature of the cable rope is increased.

3. The dried core wire enters an adhesive extruder 4 for glue brushing, the extruded glue is mainly hot melt glue, the solid of the glue is white particles, and the main component of the glue is EVA hot melt glue;

after the solid hot melt adhesive is melted to a molten state at the temperature of 120 ℃, the hot melt adhesive is quickly and uniformly coated on the core wire 1 through an adhesive extruder under the pressure of about 3MPa, and the wall thickness of the coated hot melt adhesive is 0.2-0.3 mm. If the wall thickness is too thick, the glue is in a molten state and has certain fluidity, and in the process of extruding the protective sleeve, a certain shearing friction force can be generated between the high polymer fluid and the hot melt adhesive when the polyurethane high polymer melt in the molten state flows, if the wall thickness is too thick, the shearing friction force can be too large, so that the combination of the polyurethane protective sleeve and the hot melt adhesive is influenced, the product quality is finally influenced, and if the wall thickness is too thin, the glue cannot perform the bonding function, therefore, the thickness is preferably 0.2-0.3 mm.

The melting temperature of the EVA hot melt adhesive is 99 ℃, and the heating temperature of the hot melt adhesive has a close relation with the fluidity and the bonding tension of the adhesive. When the hot melt adhesive is heated to 170 ℃, the bonding tension is higher, and when the temperature is increased to 180 ℃, the bonding tension is reduced, so that the heating temperature of the hot melt adhesive is not too high or too low, and the bonding strength is reduced although the fluidity, the wettability and the permeability are improved due to too high temperature. On the contrary, the temperature is too low, although the viscosity of the glue is increased, the fluidity of the glue is reduced, so that the gluing temperature of the hot melt glue needs to be controlled within the range of 170-180 ℃, and the temperature of the heating area is not easy to be too high, so as to prevent the sol from melting too early and being adhered to a non-extrusion area.

In order for the hot melt adhesive to require rapid extrusion and uniform application to the core, the parameters of the adhesive extruder may be set to: the feeding zone is 70 ℃, the heating zone 1 is 80 ℃, the heating zone 2 is 90 ℃, the heating zone 3 is 110 ℃, the machine neck zone is 175 ℃, the machine head zone is 180 ℃, and the die sleeve zone is 175 ℃.

4. The core wire coated with the overheated molten glue continuously moves rightwards after being extruded from the adhesive extruder 4, and enters the protective sleeve extruder 5 for extruding the protective sleeve, and the protective sleeve mainly comprises polyurethane; in order to prevent the poor feeding of the extruder caused by incomplete polyurethane melting and the large fluctuation of the glue output amount of the machine head and the uneven outer diameter of the cable, a semi-pressure type extrusion die with a little outer bearing diameter of a die core can be adopted, and the process parameters are set as follows: the feeding area is 100 ℃, the heating area 1 is 110 ℃, the heating area 2 is 150 ℃, the heating area 3 is 160 ℃, the machine neck area is 180 ℃, the machine head area is 185 ℃ and the die sleeve area is 180 ℃; the extrusion is carried out under the pressure of 5MPa, and the wall thickness of the extruded protective sleeve is about 2 mm.

Therefore, the material is preheated in the feeding area, incomplete volatilization of moisture during drying of the raw material is prevented, a drying effect is further realized, and the influence of moisture residue on subsequent processing is prevented; and the mode of gradually heating up is adopted in a plurality of heating zones, the polyurethane is uniformly and fully melted, the polyurethane is ensured to completely reach a melting state, smooth extrusion is ensured, and meanwhile, the polyurethane melt can be ensured to have better fluidity and shearing strength under the condition of about 180 ℃, so that the temperature of a machine neck zone, a machine head zone and a die sleeve zone of a main working zone of the polyurethane melt can be set to about 180 ℃.

Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is therefore defined by the appended claims.