DEVICE FOR PRE-START-UP HEATING THE DRIVE OF EXCAVATING- BUILDING MACHINE Russian patent published in 1997 - IPC

FIELD: excavating and building equipment. SUBSTANCE: device has thermal accumulator in the form of a tank with two passages. The accumulator is filled with heat absorbing material. Cooling liquid circulating system has a pump and heat exchanger placed in housing. Thermal accumulator has the third passage being a part of machine hydraulic drive. The hydraulic drive has a pump with pressure line taken to the effector. Two loops are connected in parallel to the cooling liquid circulating loop through two-position three-way and three-position four-way distributors. The second loop is connected to the second passage of the thermal accumulator only. The output of the thermal accumulator is related to the suction line of the additional pump. The heat exchanger placed in the hydraulic tank is connected in parallel with the valve. EFFECT: higher productivity. 3 cl, 1 dwg