Michae
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all messages by user
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8/10/2022 9:22:44 PM
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Detailed Comparison and Interpretation of Five Com
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Detailed Comparison and Interpretation of Five Common Blasting Methods in Open-pit Mining.._ Work
Original Title Detailed Comparison and Interpretation of 5 Common Blasting Methods in Open-pit Mining Editor's note We know that open-pit mining operations mainly include drilling blasting mining transportation and dumping Blasting is a very important part of it and the cost of blasting accounts for 15-20% of the total cost of open-pit mining Moreover the quality of blasting directly affects the efficiency of mining transportation coarse crushing and other equipment and the total cost of the mine Today Xiaobian will share several common blasting methods in open-pit mining and their application rock drilling tools Classification of blasting methods
Deep-hole blasting Deep-hole blasting is a blasting method that uses drilling equipment to drill deeper boreholes as the charging space of mining explosives The deep-hole blasting of open-pit mine is mainly the production blasting of bench Deep-hole blasting is a widely used blasting method in open-pit mines The depth of the blast hole is generally 15 to 20 m The aperture is 75 ~ 310 mm and the common aperture is 200 ~ 250 mm Characteristic Applicable conditions Deep-hole blasting is widely used in the production links of ditching stripping and mining in large mines Its blasting volume accounts for more than 90% of the total blasting volume of large mines Classification Deep holes can be divided into vertical deep holes and inclined deep holes Vertical deep holes are mostly pierced by impact piercers Inclined deep holes are mining dth bit mostly drilled by rotary drills or down-the-hole drills Its inclination is generally 75 ° to 80 ° Chamber blasting Chamber blasting is to place explosives in a pre-chiseled chamber and charge them centrally There are no rules for the amount of explosives detonated each time some of which are loaded with tens Mining Drilling Equipment hundreds or thousands of tons Because of the large amount of blasting it is also called large blasting Applicable conditions Open-pit mines are used only during the capital construction period and under specific conditions and quarries are used when conditions permit and when the demand for mining is high
The working platform is required to be wider to accommodate the ballast pile; (3) The blasting pile height is large which may affect the safety of excavator operation In addition no matter what kind of blasting method is used the Blasting Safety Regulations must be strictly implemented during blasting operations safety warning signs must be set up and warning work must be done to ensure the safety of personnel and property Source Construction Machinery Viewpoint ·END· Return to Sohu to see more Responsible Editor wt-dthtools.com
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8/10/2022 9:23:08 PM
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Knowledge of Cutting Tools: Drill Technology _ Mac
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Knowledge of Cutting Tools: Drill Technology _ Machining
The excircle diameter of the drill bit the outer diameter of the clearance part and the shank part are processed on a high-precision cylindrical grinder to ensure the design requirements of the outer mining dth bit diameter cylindricity circular runout surface finish and the like In order to improve the machining efficiency on the CNC grinding machine the drill point can be chamfered before the alloy bar is placed on the CNC grinding machine for example the drill point angle of 140 ° can be roughly ground to 142 ° during chamfering
Bit Material 21 High speed steel High speed steel (HSS) is a kind of tool steel with high hardness high wear resistance and high heat resistance also known as high speed tool steel or sharp steel commonly known as white steel High speed steel cutting tool is a tool that is tougher and easier to cut than ordinary tools High speed steel has better toughness strength and heat resistance than carbon tool steel and its cutting speed is much higher than carbon tool steel (iron-carbon alloy) so it is named high speed steel; while hard alloy steel has better performance dth rock bit than high speed steel and its cutting speed can be increased by 2-3 times Characteristic The red hardness of high-speed steel can reach 650 degrees High speed steel has good strength and toughness sharp cutting edge and stable quality after sharpening It is generally used to make small and complex cutting tools 22 Cemented carbide The main components of cemented carbide drill material are tungsten carbide and cobalt which account for 99% of all components and 1% are other metals so it is called tungsten steel (cemented carbide) Tungsten steel is a sintered composite material containing at least one metal carbide 。 Tungsten carbide cobalt carbide niobium carbide titanium carbide and tantalum carbide are common components of tungsten steel
The grain size of the carbide component (or phase) is typically between 02 and 10 microns and the carbide grains are held together using a metallic binder The bonding metal is generally an iron group metal and cobalt and nickel are commonly used Hence tungsten-cobalt tungsten-nickel and tungsten-titanium-cobalt alloys Tungsten steel drill bit material sintering molding is to press the powder into blank then heat it to a certain temperature (sintering temperature) in the sintering furnace and keep it for a certain time (holding time) and then cool it down so as to obtain the tungsten steel material with the required performance dhd drill bit Characteristic And that red hardness of the hard alloy can reach 800-1000 degree The cutting speed of cemented carbide is 4-7 times higher than that of high-speed steel High cutting efficiency
Perfect installation and fixation For example increase the support area increase the clamping force 3 Check the main shaft bearing and sliding groove 4 Use high precision tool holder such as a hydraulic tool holder 5 Use a more ductile material Copyright notice Because some of the articles are from the Internet and some of the articles are pushed without timely contact with the original author If the above copyright issues are involved please contact us to delete or deal with the original author Return to Sohu to see more Responsible Editor wt-dthtools.com
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8/10/2022 9:23:59 PM
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Maintenance, use and advantages of hydraulic impac
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Original Title Maintenance Use and Advantages of Hydraulic Impact Hammer of Roofbolter 1 Check the hydraulic pipeline before starting work Visually inspect all relevant lines and connections from the pump to the hammer to the tank Tighten the loose bolts and joints and replace the damaged oil pipes and joints in time 2 Check whether the accumulator is normal If there is obvious vibration in the pipeline connected to the oil outlet of the impact hammer when the machine is running it indicates that there is a fault in the accumulator and the machine needs to be shut down immediately and repaired by professionals After the accumulator is repaired it shall be checked by professional personnel before it is put back for use Accumulators must be checked on a routine basis at most every fastest dth hammer five years to ensure that they meet the relevant code requirements The relevant specifications of the accumulator must be observed during the inspection 3 Check the wear of the impact surface of the impact hammer
It is necessary to check the wear of the impact surface of the impactor frequently and observe whether there are dents or iron filings on the impact surface at least once a month If a dent of more than 1 mm or other damage is found on the impact surface the impact hammer must be stopped immediately and repaired 4 Regular maintenance Check all bolts and pipelines once a week If there are loose bolts and oil leakage in pipelines repair them immediately 5 Check and clean the hydraulic oil filter The hydraulic oil filter should be cleaned for the first time after 50 hours of operation and then checked every 500 hours of operation Roofbolter and its use and advantage Full hydraulic anchor drilling rig has many common names such as anchor drill down-the-hole drill dth drilling hammer water drill rock drill anchor percussion drill and so on anchoring engineering of high slopes and is also suitable for down the hole bit the construction of urban deep foundation pit support anti-floating anchor rods foundation grouting reinforcement engineering holes blasting holes of blasting engineering high-pressure jet grouting piles tunnel pipe shed support holes and the like It is convenient to construct in all directions Main drilling methods conventional drilling with
he deepest drilling depth can reach 120 meters and the fastest drilling speed can reach 1 meter per second The advantage of the equipment is that the main arm can automatically extend and retract and the head can rotate 360 degrees It is suitable for operation in the case of high drilling density and has strong geological adaptability Return to Sohu to see more Responsible Editor wt-dthtools.com
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8/10/2022 9:25:23 PM
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Drilling technology Daquan, collected! _ Drill
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The chisel edge of the drill is located near the central axis of rotation The chisel edge has a large secondary rake angle no chip space and low cutting speed so it will DHD Drill bit produce a large axial resistance If the chisel edge is ground to Type A or Type C in DIN1414 and the cutting edge near the central axis has a positive rake angle the cutting resistance can be reduced and the cutting performance can be significantly improved According to the shape material structure and function of the workpiece the drill bit can be divided into many types such as high-speed steel drill bit (twist drill group drill flat drill) solid carbide drill bit indexable shallow hole drill deep hole drill trepanning drill and interchangeable head drill bit 2
At the same time the short scrap iron makes the coolant flow to the drill tip more easily which further improves the heat dissipation effect and cutting performance in the processing process Moreover because the new chip-breaking edge penetrates the whole groove of the drill bit it can still maintain its shape and function after many times of dth hammer bit grinding In addition to the above functional improvements it is worth mentioning that the design strengthens the rigidity of the drill body and significantly increases the number of holes drilled before a single grinding III Drilling accuracy The accuracy of the hole is mainly composed of the hole size position accuracy coaxiality roundness surface roughness and hole burr
For cemented carbide drill the cutting edge has a large chamfer in the negative rake angle direction and the optional range of feed per revolution is smaller than that of high-speed steel drill If the feed per revolution exceeds this range during machining the service life of the drill will be reduced Because the heat resistance of cemented carbide drill is higher than that of high speed steel drill the rotary speed has little effect on the life of the drill so the method of increasing the rotary speed can be used to improve the processing efficiency of cemented carbide drill and ensure the life of the drill Borehole Drill Bits Rational use of cutting fluid
In order to better serve customers the company constantly enriches and improves its product structure The company has a perfect quality management system advanced quality testing equipment and professional quality management team It is a long-term member of Shanghai Building Hardware Doors and Windows Association and Curtain Wall Committee of Shanghai Building Decoration Association Contact us Address No3566 Tingwei Road Jinshan District Shanghai China Window Fastener Mall shop Shchuanggu Com Website 1 http//wwwchuanggucom Website 2 Return to Sohu http//shchuanggu1688com/ to see more Responsible Editor wt-dthtools.com
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8/10/2022 9:26:26 PM
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Devour countless children every year, these fatal
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At the time of the accident two children were playing in the water which was initially judged to be caused by electric shock The two lively and lovely children were gone and the two families were incomplete Children's parents how can not accept they are still dth drill bits alive and kicking in the morning how can not wake up in the afternoon Distressing accident should not have happened could have been avoided However the tragedy happened When parents take their children out for a walk they must be careful of these dangerous sources in the community
The most important responsibility for prevention lies with parents who should take their children away from touching the power supply and inform their sensible children of the danger of touching the power supply After all no parent who loves his child would like his child to be hurt by electric shock 03 In addition to touch power there are other hazards in the community such as elevators parking lots under tall buildings and so on I Elevator There have been countless elevator accidents On the one hand dth button bits be careful to pinch hands On the other hand when getting in and out of the elevator it is necessary to confirm that the elevator and the floor are on the same plane before getting in and out of the elevator otherwise young children may be caught or caught in the gap Many children feel that the buttons of the elevator are particularly funny like to press the buttons randomly if pressed randomly it is easy to cause danger due to improper operation so parents must pay special attention 2 Parking lot Hide and seek is a game often played by children Although there are often clips of adults playing "hide and seek" in the parking lot in movies and Secondly if the child is too young to hide in a corner of the parking lot it is not easy to be found cars come and go in the parking overburden drilling systems lot it is easy to cause danger Therefore parents should prohibit young children from playing hide-and-seek in the parking lot Three under the tall building Some children like to walk on the edge or against the wall under tall buildings If there are falling objects or throwing objects from high altitude they will be easily injured If a weak child is hit the consequences will be unimaginable Recently there was a piece of news that on the day when Beijing was hit by a force 8 gale the delivery boy of Meituan was hit by a tree and died Therefore do not go out in windy weather let alone take children out
04 There is a line in "One Servant and Two Masters" that safety comes first and everything else is empty Indeed safety is always the most important thing and the safety of every child is the greatest wish of parents Not only enterprises should keep the safety alarm bell ringing but also parents should keep the safety alarm bell ringing No matter how well parents buy school district houses and plan for their children when accidents happen some things lose their meaning 。 wt-dthtools.com
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8/10/2022 9:27:18 PM
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Summary of knowledge on dental bur needle _ taper
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TC (Tapper Cone) pointed cone with sharp tip used for axial plane preparation TR (Tapper Round) round conical head with rounded top corner which can be used for the preparation of all-ceramic <a href="https://www.wt-dthtools.com/top-hammer-drilling-tools/threaded-button-bits/mining-drill-bit.html">mining drill bit</a> crown shoulder F-Series FO Flame-like cusp used on the occlusal surface and lingual surface of anterior teeth Expand the full text S (Straight) straight/parallel series no polymerization angle except SI used for cavity preparation SF Flat head straight line no polymerization degree top right angle SR Round head straight line no polymerization degree top rounded corner SO pointed straight shape no polymerization degree top 45 degrees B (Ball) ball series ball drill BC Ring-shaped ball drill with emery cuff BR Spherical ball drill without emery cuff Other models SI Single inverted taper inverted taper drill DI Double inverted taper drill WR Discoid CR inlay preparation series CD Children's Cavity Preparation Series EX Special Shape Size identification S-Short handle SS-Very Short Shank C-thick F-fine EF-very fine L-elongated type Color marking It is the indication of particle size which is black green blue red yellow and white from coarse to fine Black extra coarse grinding needle particle size is about 150 microns/blade number is not more than 8 and extra coarse is represented by MLX Green <br><br>
UF Generally the blue marking ring or the one without color marking is the commonly used standard grain size needle and the cutting efficiency is higher when the grain size is medium The cutting force of the coarse grain needle is strong but the cutting surface is rough and the texture is obvious The close degree between the crown and the prepared body is poor and the fine grain needle can be used to refine it Adaptive symptom of different forms of bur needle Our commonly used dental preparation needles include carborundum needles tungsten steel needles and so on <a href="https://www.wt-dthtools.com/top-hammer-drilling-tools/tapered-button-bits/tapered-rock-bit.html">Tapered Rock Bit</a> Carborundum needle Diamond has high hardness and excellent physical and chemical properties The diamond grains with a certain acute angle are adhered or electroplated according to a certain direction and spacing with the central axis of the stainless steel needle as the center of the circle to make a diamond needle with a certain ability to cut hard tissues <br><br>
Turbine cooling water shall be used up to 50ml per minute 10 After the tungsten steel needle is used it should be cleaned and disinfected with high temperature and high pressure Do not use chlorine-containing disinfectant to soak the needle otherwise it will cause the tungsten steel needle to rust and become blunt Return to Sohu to see more Responsible Editor <a href="https://www.wt-dthtools.com/top-hammer-drilling-tools/tapered-button-bits/tapered-rock-bit.html">wt-dthtools.com</a>
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