REVOLVING CONSTRUCTION MACHINE

• Main Author: KAWAMOTO MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 27.12.2021
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SOIL SHIFTING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

To provide a revolving construction machine capable of suppressing the balance between the operation of a revolving motor and the operation of a boom cylinder from being changed when a revolving boom lifting operation is performed, irrespective of the change in the weight of a work device due to the replacement of a tip attachment.SOLUTION: A confluence control part 51 of a revolving construction machine controls a confluence changeover valve so that the confluence changeover valve can be switched to an inhibition state when a revolving boom lifting operation is performed. A pump capacity control part 52 of the revolving construction machine performs capacity control including the control in which first pump capacity and second pump capacity are adjusted respectively in such a manner that, when the revolving boom lifting operation is performed, according to the increase in a working pressure difference which is a value obtained by subtracting a revolving working pressure from a boom working pressure, the first pump capacity increases and the second pump capacity decreases, and according to the decrease in the working pressure difference, the first pump capacity decreases and the second pump capacity increases.SELECTED DRAWING: Figure 6 【課題】先端アタッチメントの交換による作業装置の重量の変化にかかわらず、旋回ブーム上げ操作が行われる時に旋回モータの動作とブームシリンダの動作のバランスが変わることを抑制できる旋回式建設機械を提供する。【解決手段】旋回式建設機械の合流制御部５１は、旋回ブーム上げ操作が行われる時に合流切換弁が阻止状態に切り換えられるように前記合流切換弁を制御する。前記旋回式建設機械のポンプ容量制御部５２は、前記旋回ブーム上げ操作が行われる時に、ブーム作動圧から旋回作動圧を減算した値である作動圧差が増加するのに伴って第１のポンプ容量が増加するとともに第２のポンプ容量が減少し、前記作動圧差が減少するのに伴って前記第１のポンプ容量が減少するとともに前記第２のポンプ容量が増加するように前記第１のポンプ容量及び前記第２のポンプ容量をそれぞれ調節する制御を含む容量制御を行う。【選択図】図６