Electro-Hydraulic Device With An Electronic Control For Deforming Fastening Elements

Abstract

The electro-hydraulic pistol device ( 100 ) comprises: a first electric micro-motor ( 1 ), for setting in right-wise or left-wise rotation a threaded rod ( 2 ), respectively for engaging or disengaging the rod ( 2 ) from a rivet ( 3 ); a hydraulic system ( 4 ) in which a fluid (F) pushes a cursor ( 40 ), associated to the rod ( 2 ) for impressing thereon an axial translation which causes plastic deformation of a predetermined portion of the rivet ( 3 ), such as to block the rivet ( 3 ) to a corresponding wall (P); a second electric micro-motor ( 5 ), for commanding a piston ( 50 ) destined to compress the fluid (F). An electrical circuit ( 6 ) is associated to the above organs, which electrical circuit ( 6 ) is managed by a control unit ( 60 ), to which are connected: a first micro-switch ( 61 ) activated by tie rod ( 2 ) for activation of the first micro-motor ( 1 ) in a right-wise direction; a second micro-switch ( 62 ), destined to be activated by a trigger ( 63 ) after deactivation of the first micro-switch ( 61 ), for activating the second micro-motor ( 5 ), first in a direction, for compressing the fluid (F), and then in another direction, for reducing the pressure of the fluid (F), as well as for activating, in g1hase relation, the first micro-motor ( 1 ) in a left-wise rotation; supply means ( 7 ) for the circuit ( 6 ) and the micro-motors ( 1, 5 ). The left-wise rotation of the first micro-motor ( 1 ) and the rod ( 2 ) proceeds as long as the trigger ( 63 ) is kept pressed.

1 . An electro-hydraulic pistol device with an electronic control for deformation of fastening elements, of a type comprising: a threaded rod ( 2 ) which engages with a threaded axial hole ( 3 A) of a rivet ( 3 ); a hydraulic system ( 4 ), which impresses an axial translation on the threaded rod ( 2 ), for determining a elastic deformation of a predetermined portion of the rivet ( 3 ), such as to block tie rivet ( 3 ) to a corresponding wall (P), the device ( 100 ) being characterised in that it comprises: a first electric micro-motor ( 1 ), for setting the threaded rod  2 ) in right-wise or left-wise rotation, respectively for engaging or disengaging he threaded rod ( 2 ) from the threaded axial hole ( 3 A); means ( 40 ) associated D the rod ( 2 ) for impressing the axial translation on the rod ( 2 ), by action of he hydraulic fluid (F) of the system ( 4 ); a second electric micro-motor ( 5 ), for controlling compression and discharge runs of a piston ( 50 ) located internally of a cylinder ( 51 ), so as to determine, respectively, a raising of the pressure of he fluid (F) of the hydraulic system ( 4 ), up to a maximum predetermined, value, and a reduction of the pressure; an electrical circuit ( 6 ), managed by a control unit ( 60 ), comprising a first micro-switch ( 61 ) which is activated by the rod ( 2 ) for activation of the first micro-motor ( 1 ), such that the rod ( 2 ) rotates in rightwise direction, and a second micro-switch ( 62 ), activated by a trigger  63 ) after deactivation of the first micro-switch ( 61 ), for activating the second micro-motor ( 5 ) first in a direction and then in another direction as well as for activating the first micro-motor ( 1 ) in phase relation with activation of a discharge run of the piston ( 50 ), such that the rod ( 2 ) rotates left-wise; supply means ( 7 ) for supplying electrical energy to the electric circuit ( 6 ) and, through he circuit ( 6 ), to the first micro-motor ( 1 ) and the second micro-motor ( 5 ). 
     
     
         2 . The device of  claim 1 , characterised in that the means ( 40 ) are constituted by a cursor which is slidably inserted in a chamber ( 41 ) and subjected at a side thereof to action of a contrast spring ( 42 ) and at another side thereof to action of the hydraulic fluid (F) of the system ( 4 ). 
     
     
         3 . The device of  claim 1 , characterized in that the control unit ( 60 ) is provided with means for instantaneously detecting absorption of power of the second micro-motor ( 5 ), and calculating means for relating a value of the absorption with the pressure of the hydraulic fluid (F). 
     
     
         4 . The device of  claim 1 , characterised in that first transmission organs ( 11 ) re interposed between the first micro-motor ( 1 ) and the threaded rod ( 2 ). 
     
     
         5 . The device of  claim 4 , characterised in that the first transmission organs ( 11 ) are constituted by a plurality of gears which reduce a number of rotations from an input to an output of the motion. 
     
     
         6 . The device of  claim 1 , characterised in that second transmission organs ( 52 ) are interposed between the second micro-motor ( 5 ) and the piston ( 50 ). 
     
     
         7 . The device of  claim 6 , characterised in that the second transmission organs ( 52 ) are constituted by an epicyclical reducer. 
     
     
         8 ). The device of  claim 1 , characterised in that a button-operated emergency command is included, associated to the electric circuit ( 6 ) and activating the first micro-switch ( 1 ) such that the rod ( 2 ) rotates left-wise. 
     
     
         9 . The device of  claim 1 , characterised in that a two-way switch is associated to the supply means ( 7 ), positions of the two-way switch being respectively for connecting and disconnecting the means ( 7 ) to and from the electrical circuit ( 6 ). 
     
     
         10 . The device of  claim 1 , characterised in that the supply means ( 7 ) are housed in the body ( 101 ) and the grip ( 102 ) of the device ( 100 ). 
     
     
         11 . The device of  claim 1 , characterised in that the supply means ( 7 ) are housed in a module which is external of the device ( 100 ). 
     
     
         12 . The device of  claim 1 , characterised in that the supply means ( 7 ) are constituted by batteries. 
     
     
         13 . The device of  claim 1 , characterized in that the supply means ( 7 ) are constituted by a transformer/rectifier which can be connected to an external electricity source line. 
     
     
         14 . The device of  claim 1 , characterised in that the control unit ( 60 ) is housed in the body ( 101 ) and the grip ( 102 ) of the device ( 100 ). 
     
     
         15 . The device of  claim 1 , characterised in that the control unit ( 60 ) is housed in a module which is external of the device ( 100 ). 
     
     
         16 . The device of  claim 9 , characterised in that the supply means ( 7 ) are housed in the body ( 101 ) and the grip ( 102 ) of the device ( 100 ). 
     
     
         17 . The device of  claim 9 , characterised in that the supply means ( 7 ) are housed in a module which is external of the device ( 100 ). 
     
     
         18 . The device of  claim 9 , characterised in that the supply means ( 7 ) are constituted by batteries. 
     
     
         19 . The device of  claim 9 , characterized in that the supply means ( 7 ) are constituted by a transformer/rectifier which can be connected to an external electricity source line.