Slow-speed of revolution safeguard protection boring grabTechnical field
The present invention relates to a kind of drilling tool fixture, specifically a kind of slow-speed of revolution safeguard protection boring grab.
Background technology
In prior art, the fixture one end on drilling tool is attached with power output shaft, and the other end is used for the boring drill bit of clamping, traditionally the fixture of drilling tool is all generally monolithic construction, during use, drill bit clamped by drilling tool, rotates punching under the drive of power output shaft, this monolithic construction of tradition, when fitchering or when running into bigger resistance, electric current can be made to increase suddenly, thus on the one hand may damage motor, on the other hand it is also possible to make fitchering workpiece, damage drill bit.
Content of the invention
The technical problem to be solved in the present invention is to provide one and electric current can be avoided completely to uprush, and damages the slow-speed of revolution safeguard protection boring grab of motor or drill bit.
In order to solve above-mentioned technical problem, the slow-speed of revolution safeguard protection boring grab of the present invention, including externality shaft and the internal tooth axle sleeve being enclosed within externality shaft back end circumference outer surface；Internal tooth axle sleeve fore end outer circumference is connected with an adjusting nut on surface, and the front end sleeve of adjusting nut is at the mid portion of externality shaft；Externality shaft front end arranges the chuck being used for being attached with drill bit, and externality shaft back end outer circumference is provided with external tooth, and externality shaft is cased with the multiple and intermeshing internal toothed friction plate of external tooth；It is provided with internal tooth in internal tooth axle sleeve, internal tooth is cased with multiple and internal tooth intermeshing external tooth friction plate；Interlaced in the axial direction to arrange and make both sides bonded to each other for internal toothed friction plate and external tooth friction plate, and both have mutually overlapping part diametrically simultaneously；External tooth friction plate and internal toothed friction plate are positioned between externality shaft and two spacing end faces of internal tooth axle sleeve, when externality shaft and internal tooth axle sleeve mutually extrude, external tooth friction plate and internal toothed friction plate by axial compression on two spacing end faces.
It is provided with clamping sleeve between the inner circumferential surface of described adjusting nut front end and the external peripheral surface of externality shaft mid portion, being provided with between described adjusting nut inner circumferential surface and the external peripheral surface of clamping sleeve for disposing the steel ball of steel ball to dispose position, steel ball is mounted with outer steel ball in disposing position.
The front end of described outer steel ball is spacing by the spacing preiection of clamping sleeve and adjusting nut front end, the outer retainer ring spacing on the rear end compacted set excircle of outer steel ball.
The stage casing of described externality shaft is provided with limited step, and clamping sleeve rear end face is pressed on the front end face of externality shaft upper limit step, and the rear end face of limited step forms the spacing end face being used for spacing external tooth friction plate and internal toothed friction plate.
It is provided with inner groove between described clamping sleeve and externality shaft, in inner groove, be provided with interior steel ball.
The front end circumferential outer surface of described externality shaft is cased with locking ball set, is provided with the locking ball of the steel ball placing chamber being positioned on externality shaft between locking ball set and externality shaft, and the rear end of locking ball set is provided with compression spring.
Being provided with the inner shield ring being positioned at steel ball front end on described externality shaft, the rear end face of compression spring is pressed on inner shield ring.
The rear end of described externality shaft is provided with circlip for shaft, and the front end of described internal tooth axle sleeve is provided with circlip for hole.
It is provided with the front back-up ring for spacing locking ball set on described externality shaft.
After using above-mentioned structure, due to the adjusting nut arranging, the intermeshing internal toothed friction plate with external tooth；With internal tooth intermeshing external tooth friction plate；When externality shaft and internal tooth axle sleeve mutually extrude; external tooth friction plate and internal toothed friction plate by axial compression on two spacing end faces; from there through adjusting nut; drive internal tooth axle sleeve to compress or unclamp friction plate, thus increase or reduce the moment of friction between externality shaft and internal tooth axle sleeve, the effect of transmission moment and Overload Protection can be played; completely avoid electric current to uprush; damaging motor or the situation of drill bit occurring, its structure is arranged rationally, is conducive to promoting the use of.
Brief description
Fig. 1 is the structural representation of slow-speed of revolution safeguard protection boring grab of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, the slow-speed of revolution safeguard protection boring grab of the present invention is described in further detail.
As it can be seen, the slow-speed of revolution safeguard protection boring grab of the present invention, including externality shaft 1 and the internal tooth axle sleeve 9 being enclosed within externality shaft back end circumference outer surface；The rear end of externality shaft 1 is provided with circlip for shaft 14, the front end of internal tooth axle sleeve 9 is provided with circlip for hole 15, the front end circumferential outer surface of externality shaft 1 is cased with locking ball set 12, and externality shaft 1 is provided with the front back-up ring 16 for spacing locking ball set 12；Being provided with the locking ball 13 of the steel ball placing chamber being positioned on externality shaft 1 between locking ball set 12 and externality shaft 1, the rear end of locking ball set 12 is provided with compression spring 11；
Being connected with an adjusting nut 3 on internal tooth axle sleeve 6 fore end outer circumference surface, the rear end of adjusting nut is connected with internal tooth axle sleeve circumference external screw thread by screw thread, and the front end sleeve of adjusting nut 3 is at the mid portion of externality shaft 1；Externality shaft 1 front end arranges the chuck being used for being attached with drill bit, and externality shaft 1 back end outer circumference is provided with external tooth, and externality shaft 1 is cased with the multiple and intermeshing internal toothed friction plate of external tooth 6；It is provided with internal tooth in internal tooth axle sleeve 9, internal tooth is cased with multiple and internal tooth intermeshing external tooth friction plate 7；Internal toothed friction plate 6 and external tooth friction plate 7 is interlaced in the axial direction arranges and make internal toothed friction plate 6 and external tooth friction plate 7 side is bonded to each other, internal toothed friction plate 6 and external tooth friction plate 7 have mutually overlapping part diametrically simultaneously；External tooth friction plate 7 and internal toothed friction plate 6 are positioned between externality shaft 1 and two spacing end faces of internal tooth axle sleeve 9, when externality shaft 1 and internal tooth axle sleeve 9 mutually extrude, external tooth friction plate 7 and internal toothed friction plate 6 by axial compression on two spacing end faces, just screw adjusting nut when the moment needing transmission is big, now internal toothed friction plate 6 and external tooth friction plate 7 disengaging separates, just unscrew adjusting nut when the moment needing transmission is little, from there through regulation thrust, change limit of friction value, it is therefore prevented that overload phenomenon occurs.
Wherein, it is provided with clamping sleeve 4 between the external peripheral surface of the inner circumferential surface of adjusting nut 3 front end and externality shaft 1 mid portion, it is provided with for disposing the steel ball of steel ball to dispose position between the external peripheral surface of adjusting nut 3 inner circumferential surface and clamping sleeve 4, steel ball is mounted with outer steel ball 5 in disposing position, the front end of outer steel ball 5 is spacing by the spacing preiection of clamping sleeve 4 and adjusting nut 3 front end, and the outer back-up ring 8 on rear end compacted set 4 excircles of outer steel ball 5 is spacing.
Further can be provided with limited step in the stage casing of externality shaft 1, clamping sleeve 4 rear end face is pressed on the front end face of externality shaft 1 upper limit step, and the rear end face of limited step forms the spacing end face being used for spacing external tooth friction plate 7 and internal toothed friction plate 6.
Further can also be provided with inner groove between clamping sleeve 4 and externality shaft 1, be provided with interior steel ball 2 in inner groove, when the effect of interior steel ball allows clamping sleeve move axially, do not produce excessive friction, it is ensured that it is smooth and easy moves forward；Being provided with the inner shield ring 10 being positioned at steel ball 2 front end on externality shaft 1, the rear end face of compression spring 11 is pressed on inner shield ring 10.