The common method is used to tunnel roadway construction under general engineering and hydrogeological rock formation conditions.
In the construction of roadway, especially in the rapid excavation of the roadway, carefully select the technical parameters of rock drilling, improve the equipment of rock drilling tools, correctly select the number of rock drills working at the same time and their working areas and sequences, and continuously improve the level of operation technology, etc. Rock process time and increase the speed of excavation have a great effect.
A Rock drilling equipment Rock drilling equipment mainly refers to rock drills and road drilling rigs.
( 1 ) Rock drills and drilling rigs. Rock drills are generally classified according to their power, support and propulsion mode, weight, frequency, and work and gas distribution mechanism. Drilling rigs are generally classified by power, walking mode, driving mechanism of the traveling mechanism and body structure.
( 2 ) Chiseling combined units. In order to further improve the mechanization level of excavation, a multi-purpose machine is used to reduce or eliminate the exchange time of the chiseling and loading equipment on the working surface. A variety of chisel combined units have been studied abroad, mainly as follows:
1 ) Bucket-type chisel combined unit. Adding a hydraulic rock drilling arm to the bucket chain loader;
2 ) Crab-claw chisel combined unit. Adding a hydraulic rock drilling arm to the crab claw loader;
3 ) The rock drilling unit with the rock-piercing arm is used in conjunction with the loader. The rock drilling unit is sent to the working surface along the suspended track and mounted on the loader for rock drilling. After the rock drilling is completed, the rock drilling unit is removed from the loader and the working surface is still pushed along the suspended track.
B Rock Drilling Tools Rock drilling tools mainly refer to the bit and brazing.
C Measures to improve rock drilling efficiency ( 1 ) Adopt high efficiency rock drill. When using a drilling rig, a medium, high frequency, and external rotary rock drill should be provided.
( 2 ) Realize multi-machine simultaneous operation. When using the drilling rig, configure more than 2 rock drills; when using pneumatic leg rock drilling, be sure to take multiple machines at the same time, generally 1~1.5m2 Â It is advisable to arrange a rock drill. The number of simultaneous drilling machines and the depth of the hole in the case of several medium tunneling speeds in domestic mine roadway excavation .
( 3 ) Ensure the supply of compressed air, and the working face pressure is not less than 0.55~0.6MPa .
(4 ) Reasonably select the diameter, number and depth of the blasthole.
( 5 ) Cultivate a skilled rock drilling technical team.
Double-Cone Rotary Vacuum Dryer
As a professional drying equipment manufacturer, we provide more than hundred sets of equipment for our users. The heating media such as high temperature heat transfer oil, middle temperature steam and low temperature hot water are available for our products. When drying viscous materials, we can design the special [copying" mechanism or set balls in the tank for you.
Applications:
It is suitable for concentration, mixing and drying of powder, granular and fibrous materials in such industries as chemical industry, medicine, food, etc., and materials that require low temperature drying(such as biochemical products), and is more suitable for drying of materials that are easy to oxidize, volatize, heat sensitive materials, irritant and poisonous materials, and materials in which breaking of crystals is not allowed.
Principle:
• After the heat source(such as hot water, low pressure steam or heat transfer oil) is connected to the closed jacket, the heat is transferred from the inner shell to the materials to be dried.
• Driven by the power, the tank makes slow rotation and the materials in the tank are continuously mixed so as to realize the purpose of drying.
• When the materials are under vacuum, the steam pressure reduces to make the moisture(solvent) on material surtaces reach the saturation status and evaporate, and discharged and recovered timely from the vacuum pump. The moisture(solvent) inside the materials is penetrated, evaporated and discharged towards the surfaces. The three processes are carried out continuously, so that the materials are dried within a very short time.
Features:
• During oil heating, automatic constant temperature control is adopted to dry biochemical products and mineral raw materials.
Temperatures vary within the range of 20-160℃.
• The heat efficiency is 2 times higher than that of common ovens.
• Indirect heating will cause no pollution to the materials, conforming to GMP requirements. The equipment is simple to repair and operate and easy to clean.
Double-Cone Rotary Vacuum Dryer,Rotary Cone Vacuum Dryer,Double Cone Vacuum Dryer,Double Cone Vacuum Dryer Machine
Jiangyin Jirui Machinery Manufacturing Co,LTD , https://www.jiruimachine.com