Background technology
The rotation tailstock is the four-axis mounting that is used to install workpiece in the multi-shaft interlocked machining center, requires to have the accurate control that the self-actuating brake function realizes workpiece motion s.The automatic brake mechanism of traditional processing center rotation tailstock adopts hydraulic mechanism, mainly is made up of a plurality of small oil tanks and a high rigidity brake wheel, and the brake wheel fixed cover is loaded on tailstock spindle; The small oil tank cylinder body is fixed on the tailstock body; Tailstock spindle is installed on the spindle hole on the tailstock body through bearings, and in the time of need braking tailstock spindle, the small oil tank piston stretches out cylinder body; And abut to brake wheel, utilize the frictional force of piston and brake wheel to realize braking brake.Such brake gear brake torque is little, and discontinuity equalization is easy to generate axial runout, the brake poor reliability, and a plurality of small oil tank response times are difficult to unified, cause brake sensitivity not high, and structure is numerous and jumbled.
The utility model content
The purpose of the utility model is exactly that existing rotation tailstock brake gear structure is numerous and jumbled, action sensitivity is not high, brake torque is little, the defective of brake poor reliability, proposes the rotation tailstock spindle brake gear that a kind of reliability is high, action sensitivity is high, brake torque is big in order to overcome.
For this reason, the utility model adopts following technical scheme: rotation tailstock spindle brake gear comprises hydraulic jack; It is characterized in that: described brake gear also comprises moving brake block, coupled wheel; The inner chamber of cylinder block stage casing internal diameter of described hydraulic jack forms step end face greater than the back segment internal diameter, and the piston stage casing external diameter of hydraulic jack forms the backward step end face greater than the back segment external diameter; Piston leading portion external diameter is less than the stage casing external diameter; Form the front step end face, the backward step end face of the step end face of inner chamber of cylinder block and piston is formed hydraulic cavities relatively, and this hydraulic cavities is connected with pressure oil-source through pipe joint; Described piston hollow is tubular; Its front end face is relative with the tailstock body rear end face of rotation tailstock; Described coupled wheel is fixedly connected with the rotation tailstock spindle; Described moving brake block is installed on the coupled wheel, and between described piston nose face and tailstock body rear end face, all gapped between moving brake block and piston nose face, the tailstock body rear end face; Described hydraulic jack inner chamber of cylinder block leading portion internal diameter is less than the stage casing internal diameter; The bulge loop of bending in forming; Axial hole is set on the bulge loop, and putting spring in the axial hole, axial hole front end are screwed stop screw spring are carried out axial limiting; Spring rear end is resisted against the front step end face of described piston, the compression elasticity through spring be piston after move to reset driving force be provided.
As to technique scheme replenish and perfect, the utility model also comprises following technical characterictic.
Be installed with fixedly brake block on the described tailstock body rear end face,, increase frictional force with described moving brake block matched in clearance.
Between described hydraulic jack cylinder body and the piston Front oil seal and Rear oil seal are set, the hydraulic cavities of oil cylinder is played the enhancing sealing function.
Described cylinder block is made up of front jar sheath and back cylinder sleeve butt joint, and the front end face of back cylinder sleeve is formed hydraulic cavities as the step end face and the described piston backward step end face of described inner chamber of cylinder block.
Described back cylinder sleeve rear end face is equipped with cylinder cover, and oil cylinder is sealed.
When the utility model uses; The oil cylinder hydraulic chamber is connected with pressure oil-source through pipe joint, when carrying out brake, injects hydraulic oil to hydraulic cavities; The reach of promotion piston; The piston roof pressure moves brake block, and moving brake block produces miniature deformation and presses against fixedly brake block, utilizes frictional resistance that the brake block band is stopped operating with the rotation tailstock spindle; After the rotation tailstock spindle stops operating, drain the oil in the oil cylinder hydraulic chamber, and piston is homing under the spring force effect, moving brake block reinstatement.
Use the utility model can reach following beneficial effect: the utility model adopts high thrust trunk-piston formula oil cylinder as the brake driving force, adopts moving brake block and fixedly brake block friction fit realization brake, and brake torque is big, and brake sensitivity and reliability are high.
The specific embodiment
Be described in detail below in conjunction with the specific embodiment of accompanying drawing the utility model.
Like Fig. 1, shown in Figure 2, the utility model comprises hydraulic jack, moving brake block 14, fixedly brake block 15 and coupled wheel 8, and the cylinder body of hydraulic jack is docked with back cylinder sleeve 11 by front jar sheath 12 to be formed; Between the interface of front jar sheath 12 and back cylinder sleeve 11 sealing ring 5 is set; Front jar sheath 12 inner chamber leading portion internal diameters are less than the back segment internal diameter, curved bulge loop in front jar sheath inner chamber front end forms, and back cylinder sleeve internal diameter is less than front jar sheath back segment internal diameter; Back cylinder sleeve 11 front end faces are as the step end face of inner chamber of cylinder block; The piston 7 stage casing external diameters of hydraulic jack form the backward step end face greater than the back segment external diameter, and piston 7 leading portion external diameters form the front step end face less than the stage casing external diameter; The backward step end face of the front end face of back cylinder sleeve 11 and piston 7 is formed hydraulic cavities relatively, and this hydraulic cavities is connected with pressure oil-source through pipe joint; Piston 7 hollows are tubular; Its front end face is relative with tailstock body 2 rear end faces of rotation tailstock; Fixedly brake block 15 is installed on the rear end face of the tailstock body 2 that rotates tailstock, and coupled wheel 8 is fixedly connected with the rotation tailstock spindle that rotation tailstock 1 is installed, and moving brake block 14 is installed on the coupled wheel 8; And at the front end face of piston 7 and fixedly between the brake block 15, the front end face of moving brake block 14 and piston 7, fixedly all gapped between the brake block 15; On the bulge loop of front jar sheath 12 front ends axial hole is set; Putting spring 13 in the axial hole; The axial hole front end is screwed stop screw spring 13 is carried out axial limiting, and spring 13 rear ends are resisted against the front step end face of piston 7, the compression elasticity through spring 13 be piston 7 after move to reset driving force be provided; Front oil seal 3 and spacing with Front oil seal end cap 4 is set between front jar sheath 12 and the piston 7, Rear oil seal 6 and spacing with Rear oil seal end cap 10 is set between back cylinder sleeve 11 and the piston 7; Back cylinder sleeve 11 rear end faces are equipped with cylinder cover 9.