Hitachi's Silver Lining - Pdworld.com

Technical specificationsHB 2 000 HB 3 100 HB 4 700Service weight (kg) 2 000 3 100 4 700Carrier weight class (t) 22–38 32–52 45–80Oil flow (l/min) 150–190 210–270 260–340Operating pressure (bar) 160–180 160–180 160–180Number of blows (bpm) 300–600 280–560 280–520Doosan hydraulic breakers guardagainst pressure reductionsDoosan has launched its DXB hydraulic breakersfor the European demolition, construction, andmining market. The DXB30, DXB100, DXB170,DXB190, and DXB260 models cover carriersfrom mini-excavators and skid steer loaders tolarge excavators.DXB technology ensures the carrier isprotected from the effects of reduction in pressurepeaks. The breakers include an energyrecovery system and a patented valve system,increasing overall performance. The piston andcylinder are manufactured to precise tolerances,resulting in lower maintenance costs. In addition,an advanced dampening system protects thebreakers against blank firing.The Doosan DXB170 is suitable for 18 to28t excavators, while the DXB260 is designedfor use on 27 to 37t excavators. The superiorpower-to-weight ratios of these breakers providevery efficient reduction of rock, boulders,concrete and other demolition waste, as well asexcellent excavation work.Atlas Copco heavy breakers feature PowerAdapt,optimized power-to-weight ratioAtlas Copco’s heavy hydraulic breaker models,HB 2000 HB 3100, and HB 4700, are designedto allow smaller attachments and carriers toprovide the same kind of performance as theirlarger counterparts. All three deliver significantlymore power than their predecessor models.The breakers are equipped with the Power-Adapt system, which shuts down the breaker incase the oil pressure is too high. “This is usefulwhen the hydraulic breaker is used on differentcarrier units,” says Atlas Copco medium andheavy breaker product manager Torsten Treger.“Hydraulic breakers can generally be hydraulicallyoverloaded if the carrier’s oil pressure hasthe wrong setting. In order to ensure that ourcustomers can make full use of the equipment interms of efficiency and power, we have equippedthe entire range of heavy-duty hydraulic breakerswith PowerAdapt.”With an improper carrier oil pressure setting,conventional pressure relief valves, as the onesfrequently used in hydraulic breakers, continu-ously drain oil into the tank and therefore wasteprecious energy. This affects the efficiency andprofitability of the equipment.The improved guide system of the hydraulicbreakers provides a better stability and resistance.“After all hydraulic breakers are subject totough operating conditions,” says Treger. “A newretaining bar provides better protection especiallyin the lower part of the hydraulic breaker, whichhas to take a lot of wear and tear. Both the Dustand Non-Dust versions of the three new modelsare furnished with the same all-round wearprotection.” The HB Series also feature the VibroSilencedSystem to protect operators againstnoise and vibrations, AutoControl to adapt theblow frequency and impact energy to the rockhardness, and the ContiLube II integratedautomatic lubrication system. The StartSelectfeature allows the operator to influence thebreaker’s starting and shutdown behaviour, whilean optional DustProtector prevents penetration oflower parts by dust and rock particles.Technical specificationsModel Carrier Operating Tool Operating Hydr. Flow. Max Energy perWeight Weight Dia Pressure Req. Frequency Blowt kg mm bar l/mm bpm jouleDXB30 3.5–7 250 68 140 35–50 700 1 000DXB100 10–20 900 106 170 80–140 800 2 350DXB170 18–28 1620 137 180 100–150 600 3 400DXB190 20–30 1750 142 180 120–180 600 4 000DXB260 27–37 2450 156 180 150–240 600 5 000Okada breakerstresses versatilityOkada has designed its TOP 280 breaker for awider range of applications than the company’sprevious 20t class model. Matched with an 18to 30t class carrier machine, the TOP 280’shydraulic circuit breaker provides a 12% higherimpact frequency with similar blow impact power.In addition, new component materials and a newchisel set pin fixing system extends the life ofthe chisel by 35%. The TOP 280 also does notrequire an accumulator, and is easily maintainedwith only a few spare parts.Wacker Neuson breaker letsyou gas and go…Wacker Neuson’s new generation of gasolinebreaker, the BH 65, offers improved reliability,serviceability, and ergonomics features to increaseproduction in a variety of applications,including breaking concrete floors, walls, sidewalks,stones, brickwork, frozen ground, heavyclay and similar materials.Powered by Wacker Neuson’s own EPAcertified2-cycle engine, the tool can also beused for cutting and breaking asphalt pavements,soil probes, ground rod stakes, and tampingsmall backfill areasWeighing in at only 26 kg and hitting with asingle stroke impact of 65 joules/blow at a rate of1250 blows/min, the BH 65 offers an excellentpower-to-weight ratio. The self-contained unitdoes not require a generator or compressor,making it convenient and ideal for use in remote20 PDi • Issue 2 • May - June 2011areas. An improved cooling system, the heart ofthe user-friendly design, uses an air deflector totransfer cool air to the percussion system. Thisdecreases the BH 65’s overall temperatureand increases the operator comfort, safety andservice life of the breaker.Improved ergonomic features include anew compact design with redesigned hood andhandles that make it easier to operate the unit.Along with the unit’s patented air percussionsystem and vibration dampening housing, thisfeature enables operators to work for longerperiods of time under more comfortable conditionswithout compromising performance andincreasing productivity. To improve handling andmaintenance, a repositioned fuel cap is easier toaccess from any position. This allows the operatorto refill the tank with the unit upright or lying onthe ground. An integrated purge bulb removes airfrom the fuel line and improves starting. Anothernew product entry from Wacker Neuson is the EH75/240, the only 240V electric breaker availablein the United States. Using any construction grade3.8kW portable generator, the EH 75/240, withan integrated inverter, converts single phase tothree-phase power ensuring that each time thetool hits the concrete it delivers a consistent hardblow. Because of the inverter, the EH 75 canbe powered by a brushless three-phase motorand offers consistent power supply even whenusing a long extension cord. The inverter alsoprotects the tool with an automatic shut off ifinput voltage is too low or too high, providing forlong life and unmatched durability. By eliminatingthe traditional rotor and carbon brushes foundon competitive models, Wacker Neuson haseliminated the need for maintenance on this tool.With no brushes to replace or winding failures tocontend with contractors can be assured that thistool will provide the best uptime in the industry.The EH 75 weighs only26 kilo, and hits with 75joules. With the high percussionrate of 1275blows/min, the EH 75offers the highest power-to-weightratio ofany breaker inthis size class.Because the EH75 and a small portable generator can easily fitin the back of a pickup truck, the new tool canmeet the performance of 27 to 32kg pneumatichammers, while eliminating the need to tow acompressor. The EH 75’s outstanding performanceand extremely high breaking output is theresult of a new hollow piston percussion systemwith a rod striker and patented shockwaveoptimizedpercussion system along with the highsingle stroke energy.