Electro-hydraulic riveting tool

An electro-hydraulic riveting tool, comprising a riveting working head (1) and a pump body (35), wherein the riveting working head (1) is composed of a cylinder body (2), a hollow piston shaft (3) and a rear end cover (4);

• the cylinder body (2) and the rear end cover (4) jointly define a hydraulic cavity (5) for the movable hollow piston shaft (3);
• the cylinder body (2) is internally provided with a first oil passage (6) for connecting with a front end of the hydraulic cavity (5) and a second oil passage (7) for connecting with a rear end of the hydraulic cavity (5);
• the pump body (35) is furnished with a third oil passage (8) for connecting with the first oil passage (6) and a fourth oil passage for connecting with the second oil passage (7), wherein in that,
• the riveting working head (1) is communicatively provided with a broken-nail guide tube (10);
• a rear end of the broken-nail guide tube (10) is connected with a nail-collecting box (11);
• an adapter plate (12) is sleeved on the outer wall of the broken-nail guide tube (10);
• an oil passage is formed within the adapter plate (12);
• the oil passage of the adapter plate comprises a first intermediate oil passage (13) for connection between the first oil passage (6) and the third oil passage (8), and a second intermediate oil passage (14) for connection between the second oil passage (7) and the fourth oil passage;
• the adapter plate (12) has an accommodation groove (15) inside, connecting with the oil passage of the adapter plate and parallel to the reciprocating movement direction of the riveting working head (1);
• a shock-absorbing joint (16) is disposed within the accommodation groove (15);
• inside the shock-absorbing joint (16), there is an axial oil duct (17) extending axially along the shock-absorbing joint (16) and a radial oil-duct (18) extending radially along the shock-absorbing joint (16);
• the axial oil duct (17) is in fluid communication with the radial oil duct (18), and the axial oil duct (17) is connected with either the first oil passage (6) or the second oil passage (7);
• when the riveting working head (1) is running, a length of the shock-absorbing joint (16) within the accommodation groove (15) is always less than that of the accommodation groove (15), and the radial oil duct (18) remains connected with the oil passage of the adapter plate at all times.