1. When the top plate is broken, use the direct way to pass through the drilling machine nest and avoid the cockroach 1, preparation work 1. Clean up the rigs or the debris in the shackles; 2. One beam and two columns are supported at both ends of the I-shaped steel shed in the rig or the shovel, and then the I-beams of the two gangs of the I-beam shed are replaced by the vertical I-beams to ensure regular strength. The single pillar anti-back rope is complete and effective, F>>90kN, the single pillar is strictly prohibited to use; 3. In the machine nest where the raft is topped, a beam and two columns are placed at the two ends of the I-beam steel shed under the raft, and then the I-beam legs of the two gangs are replaced. ; 2, over the rig and dodge: 1. When the working face is taken to the drilling machine nest or avoiding the shovel, the shed will be artificially changed first, and the single unit under the I-steel shed will be more than 1.2 meters away from the coal side of the transporter, and then the coal mining machine will be used to sweep the coal to prevent the shearer from cutting the monomer; 2. When moving the frame, lower the front beam of the bracket, so that the front beam of the bracket supports the steel beam of the I-beam; 3. As the work surface advances forward, the shed, coal sweep, and pull frame are successively changed. 2. When the top plate is complete, use the shed to pass the drilling machine nest or avoid the cockroach: 1, preparation work 1. Clean up the rigs or the debris in the shackles; 2. Between the I-steel sheds with the hinged top beam and the hydraulic single-unit set of two beams and three columns to the shed (one beam and two columns on the coal side, one beam and one column on the old pond side), the single vertical erection of the top beam, the bracket should be regular and strong The single-pillar anti-backing rope is complete and effective, F>>90kN, and it is strictly forbidden to use ultra-high; then replace the I-steel shed; 3. In the rig of the rig, the raft is connected with the raft, and a beam and two columns are arranged at the two ends of the I-beam shed under the raft, and then the two gangs of the I-steel are replaced. ; 2, over the rig and dodge: 1. When the working face is taken to the drilling machine nest or to avoid the shovel, the shed will be artificially modified to keep the monomer from the coal side of the transporter more than 1.2 meters, and then the coal machine will be used to sweep the coal to prevent the shearer from cutting the monomer; 2, when the frame is replaced by the hinged top beam shed, the bracket is used to slide the front beam to support the roof in time, and then the vehicle is moved to the frame; when the rig is moved by the raft with the raft, the front beam of the bracket is lowered. Pull the bracket so that the front beam of the bracket is supported by the I-beam steel beam; 3. As the working face advances forward, the shed will be turned forward, the coal will be swept, the shed will be replaced, and the frame will be pulled. Third, security management 1. When the working face is taken 15 meters away from the drilling rig or escaping from the boring machine, timely preparations such as shed shed or erecting I-beam, one beam and two column sheds and replacing the steel shed legs; 2. When the working face is taken 10 meters away from the rig or away from the rig, it is strictly forbidden for personnel to enter; 3, for the shed to change the shed, adhere to the principle of first support, first support and then change; adhere to the principle of first set and then replace, can not replace the back, and from the outside to avoid causing the top; 4, for the shed to change the shed to set up a shed for a shed, adhere to the shed, it is strictly prohibited to demolish; 5, the single pillar anti-back rope is complete and effective, F>>90kN, the single pillar is strictly prohibited to use; 6. When the coal is used to replace the shed and change the shed in the working face, the transporter and the shearer should be stopped. The coal mining machine should be stopped at a location 5 meters away from the working place. The transport aircraft should be locked, and the personnel who have finished the work should be evacuated to a safe place. The rear can unlock the boot; 7. When the shed is changed to the shed, the personnel should stand in a safe place with the support of the support, strictly implement the system of knocking and helping the top, and it is strictly forbidden to work with empty tops, and one person is working, one person is guarded, and the danger is promptly removed. 8. When replacing the steel shed, use the jacks under the top beam and use the jacks, chain hoists or pullers to return the shed legs. The jacks must be connected with the I-steel chain and fixed at On the firm and reliable overlord pile, when personnel are operating, they should hide in a safe place with cover to prevent the chain from hurting people. After all the legs have been recycled, put down the I-beam. 9. When replacing the steel beam, it is strictly forbidden for personnel to pass or stay under the I-beam. 10. When replacing the leg of the I-beam, the personnel are strictly prohibited from facing the leg of the I-beam, preventing the leg of the I-steel from collapsing and injuring people. Paraffin wax (or petroleum wax) is a soft colorless solid, derived from petroleum, coal or shale oil, that consists of a mixture of hydrocarbon molecules containing between twenty and forty carbon atoms. Common applications for paraffin wax include lubrication, electrical insulation, and candles; dyed paraffin wax can be made into crayons. It is distinct from kerosene and other petroleum products that are sometimes called paraffin. Paraffin Wax,Candle Material,Wax For Candle Making,Paraffin Wax For Candle Making Shenyang Shengjie Candle CO.,LTD , https://www.sj-candle.com
industrial applications, it is often useful to modify the crystal properties of the paraffin wax, typically by adding branching to the existing carbon backbone chain. The modification is usually done with additives, such as EVA copolymers, microcrystalline wax, or forms of polyethylene. The branched properties result in a modified paraffin with a higher viscosity, smaller crystalline structure, and modified functional properties. Pure paraffin wax is rarely used for carving original models for casting metal and other materials in the lost wax process, as it is relatively brittle at room temperature and presents the risks of chipping and breakage when worked. Soft and pliable waxes, like beeswax, may be preferred for such sculpture, but "investment casting waxes," often paraffin-based, are expressly formulated for the purpose.
Other uses
Candle-making
Wax carving
Coatings for waxed paper or cloth
Over-the-drilling nest, avoiding sputum and supplementing safety technical measures
There are two ways to avoid over-rig and nest cave: