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Preparation technology of high strength net false roof for underground coal mining

A preparation process and high-strength technology, used in mining equipment, earth-moving drilling, temporary shielding, etc., can solve the problems of hidden dangers of steel wire, easy to scratch staff, large mesh creep, etc., and achieve welding speed. Fast, automatic production, strong anti-corrosion and anti-rust effect

Inactive Publication Date: 2011-10-05
HENGSHUI BAOLI ENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the wire mesh is also easy to scratch the staff, causing unnecessary injuries
However, the plastic woven mesh is easy to pull out the longitudinal ribs and transverse ribs when it is used, the creep of the mesh is large, and the protection effect is poor.
[0003] The utility model patent No. 200620024810.1 discloses a false roof for underground coal mines and the utility model patent No. 200620024811.6 discloses a composite mesh false roof for underground coal mines. Ordinary process welding, although there is no need to remove it before the coal seam is mined, the strength of the false roof used in the underground coal mine is not very high, and the steel wire wrapped inside the false roof of the composite mesh used in the underground coal mine still has potential accidents

Method used

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  • Preparation technology of high strength net false roof for underground coal mining
  • Preparation technology of high strength net false roof for underground coal mining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The first step raw material processing

[0021] Put 100 parts by weight of polypropylene, 12 parts by weight of flame retardant, and 8 parts by weight of antistatic agent into the mixer together, and control the temperature of stirring at 60 ° C, stir for 10 minutes, and leave after stirring evenly. material;

[0022] Step 2 Extrude the Strips

[0023] Fill the well-stirred mixture into the preheated plastic extruder, adjust the temperature of the barrel of the plastic extruder to keep the temperature of the barrel at 185°C, and extrude the mixture through a die head with adjusted thickness to form a high-strength mesh belt with a width of 10 mm and a thickness of 0.5 mm, and then introduce the extruded high-strength mesh belt into the cooling water tank for cooling and shaping, and the cooled and shaped high-strength mesh belt is embossed by an embossing machine and then wound to the traction on board;

[0024] The third step is welding into a mesh

[0025] Accordi...

Embodiment 2

[0029] The first step raw material processing

[0030] Add 100 parts by weight of polypropylene, 12 parts by weight of flame retardant, and 8 parts by weight of antistatic agent into the mixer together, and control the temperature of stirring at 65 ° C, stir for 5 minutes, and leave after stirring evenly. material;

[0031] Step 2 Extrude the Strips

[0032] Fill the well-stirred mixture into the preheated plastic extruder, adjust the temperature of the barrel of the plastic extruder to keep the temperature of the barrel at 200°C, and the mixture is extruded through the die with adjusted thickness , to form a high-strength mesh belt with a width of 15mm and a thickness of 1.5mm, and then introduce the extruded high-strength mesh belt into the cooling water tank for cooling and shaping. ;

[0033] The third step is welding into a mesh

[0034] According to the width and size requirements, arrange the high-strength mesh belts on the welding frame so that the vertical high-st...

Embodiment 3

[0038] The first step raw material processing

[0039] Add 100 parts by weight of polypropylene, 12 parts by weight of flame retardant, and 8 parts by weight of antistatic agent into the mixer together, and control the temperature of stirring at 62.5 ° C, stir for 7.5 minutes, and leave after stirring evenly. material;

[0040] Step 2 Extrude the Strips

[0041] Fill the well-stirred mixture into the preheated plastic extruder, adjust the temperature of the barrel of the plastic extruder to keep the temperature of the barrel at 192°C, and the mixture is extruded through the die with adjusted thickness , forming a high-strength mesh belt with a width of 12.5 mm and a thickness of 0.75 mm, and then introducing the extruded high-strength mesh belt into the cooling water tank for cooling and shaping. on board;

[0042] The third step is welding into a mesh

[0043] According to the width and size requirements, arrange the high-strength mesh belts on the welding frame so that t...

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Abstract

The invention which belongs to the technical field of protective articles for coal mining discloses a preparation technology of a high strength net false roof for underground coal mining. The main technology is characterized in that: a mixture, which is composed of polypropylene, a fire retardant and an antistatic agent and is added to a mixer to be uniformly stirred, is filled into a preheated plastic extruder to extrude high strength guipures; the guipures are cooled, embossed and arranged on a welding frame; nodes of vertical high strength guipures and transverse high strength guipures are welded by an ultrasonic welding machine to form the high strength net false roof for underground coal mining; and the high strength net false roof is sheared by a polishing machine and rolled into roll shape and enters a storehouse after examination. According to the present invention, the high strength net false roof for underground coal mining prepared by the technology, which allows static electricity not easily to be generated by friction, flame resistance to be fine, rust-proof capability to be strong, construction and transport to be convenient and carrying ability to be strong, can be used to support a whole roadway roof, so joints are reduced, the work efficiency is improved, and the false roof effect is achieved when the false roof is pre-embedded in a coal seam when coal is mined layer by layer.

Description

technical field [0001] The invention belongs to the technical field of coal mine protective equipment, and in particular relates to a preparation process of a high-strength mesh false roof for underground coal mines. Background technique [0002] False roofs are required for protection in layered mining of thick coal seams, and most of the currently used false roofs are wire mesh or plastic woven mesh. Because the underground coal mine contains a large amount of acids and alkalis and various chemical components that are easy to corrode metals, the wire mesh false roof is easily rusted and corroded, resulting in hidden dangers of accidents. Secondly, the wire mesh false roof needs to be removed before separate mining to prevent fires and gas explosions caused by sparks when the shearer crushes it, and also to prevent metal fragments from being mixed into the coal to increase the difficulty of coal washing and reduce the purity of coal . In addition, the wire mesh is also ea...

Claims

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Application Information

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IPC IPC(8): C08L23/12B29C69/00B29C65/08B29C47/92E21D19/00B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92895
Inventor 刘颖田青山
Owner HENGSHUI BAOLI ENG PLASTIC
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