HYDRAULIC PERCUSSIVE MACHINE (VARIANTS) Russian patent published in 2003 - IPC

FIELD: mining art; construction engineering; driving rod members into ground; crushing outsize. SUBSTANCE: proposed machine has housing, striker, direct stroke chamber and reverse stroke chamber formed between housing and striker, control channel connected with reverse stroke chamber at the end of reverse stroke of striker, hydraulic distributing unit used for connecting the direct stroke chamber with liquid source, accumulator and reverse stroke chamber at the end of reverse stroke of striker and for connecting with return line after delay of striker before beginning of reverse stroke and attaining preset pressure P_pr in system. According to first variant, hydraulic distributing unit has two hydraulic distributors: main and additional distributors. First control chamber of main hydraulic distributor is connected with liquid source, accumulator and reverse stroke chamber at all times and second chamber is pressed by spring at force equal to force in first control chamber at pressure of liquid equal to P_pr,; provision is made for access to control channel in housing through additional hydraulic distributor in one of positions; at other position, it is connected with return line at pressure in system lesser than P_pr. First control chamber of additional hydraulic distributor is connected via throttle valve of hydraulic distributing unit with liquid source, accumulator and reverse stroke chamber and second control chamber is pressed by spring at force ensuring operation of main hydraulic distributor at attaining of pressure P_pr in system. According to second variant, additional chamber formed between striker and housing is connected with return line. Second control chamber of additional hydraulic distributor is pressed by spring at force equal to force in first control chamber at pressure of working fluid equal to P_pr, it has access to control channel in housing with additional hydraulic distributor in one of positions and in other position of this distributor it is connected with return line at pressure in system lesser than P_pr.. EFFECT: enhanced reliability and stability. 3 cl, 2 dwg