The synchronous pulley of band torque limited
Technical field
The present invention relates to the mechanical transmissioning technology field, more particularly it is a kind of synchronous pulley with torque limited.
Background technique
The engagement driving that band transmission synchronously is made up of synchronous band and synchronous pulley; Its motion and power is through the transmission that is meshed with gear of band tooth, compare with the normal tape transmission have be with and belt wheel between do not have slide relative, advantage such as velocity ratio is constant, transmission efficiency is high, compact structure, wear resistance are good.Calculated or estimation though when design, do; But tend to occur some beyond thought situation in the real-world operation process,, actual load is increased severely like accidental impact, misoperation etc.; And can not skid during existing synchronous pulley overload, this can cause the damage of motor or other important parts.
For the overload that prevents synchronous pulley is damaged; The Chinese patent notification number is to disclose such technological scheme among the CN202082366U, and it comprises wheel body, axle sleeve and safety pin, and an axial pin-and-hole is arranged on wheel body; Wheel body is sleeved on the axle sleeve outer ring; Axle sleeve is the ladder axle sleeve, and an axial pin-and-hole is arranged on the axle sleeve step, and wheel body is connected by safety pin with axle sleeve.During work, after the driving pulley that links to each other with motor rotated, the wheel body that drives driven pulley through synchronous band rotated; The wheel body of driven pulley links to each other with axle sleeve, and axle sleeve is along with wheel body rotates, and the axle sleeve inner ring links to each other with working shaft; Rotate thereby drive working shaft, realized mechanical running.When the situation of overload occurring in the process in the work, under torsional interaction, safety pin is cut off, and protects machine through cutting off of safety pin.Though can continuing to drive the follower wheel body, motor rotates; But because of safety pin is cut off, thereby make wheel body idle running, axle sleeve stops operating; Therefore the working shaft that links to each other with axle sleeve does not rotate, thereby avoiding occurring causes motor, damages with belt or other important parts because of overload.
Though this structure has overload protection effect; But it can cause the damage of safety pin and connection part; Could proper functioning behind the safety pin that needs more to renew again, do not resume work the automatically function of state of situation about recovering during for the overload postscript of moment causes long shutdown easily.In addition; The structure of this overload protection is not regulated the effect of overload protection power as required, can be because the discomfort of overload protection power setting causes the regular damage of safety pin; Not or not the damaging for a long time of safety pin; And not reaching overload protection effect, reasons such as the design of safety pin, calculating, foozle, heat treatment hardness cause safety pin to cut off by moment of torsion on request, and play a protective role.
Summary of the invention
The objective of the invention is to overcome above-mentioned existing disadvantages of background technology part, and a kind of synchronous pulley with torque limited is provided.
The objective of the invention is to reach: the synchronous pulley of band torque limited through following measure; It comprises wheel hub and foreign steamer, it is characterized in that described wheel hub is provided with axial baffle, and described foreign steamer is provided with axial foreign steamer friction plate; Friction plate is arranged between described axial foreign steamer friction plate and described axial baffle; The outside at wheel hub is connected with pressing plate, described friction plate is arranged between described axial foreign steamer friction plate and described pressing plate, on wheel hub, is connected with adjusting nut; Between adjusting nut and pressing plate, be furnished with spring and the spring bearer plate that is used for holddown spring, have lock screw to pass adjusting nut.
In technique scheme, described axial baffle is structure as a whole with wheel hub and is vertical with the axle sleeve part on the wheel hub.
In technique scheme, described axial foreign steamer friction plate is structure as a whole with foreign steamer and is vertical with the wheel body portion on the foreign steamer.
In technique scheme, in the outside of described wheel hub and foreign steamer cover plate is arranged, described cover plate passes through screw on foreign steamer.
In technique scheme, between described wheel hub and cover plate, bearing is arranged.
In technique scheme, on described spring bearer plate, evenly be furnished with circular hole, described lock screw feeds in the circular hole, and the degree of tightness hole is arranged on the described adjusting nut.
In technique scheme, be threaded between described adjusting nut and the wheel hub.
In technique scheme, between described wheel hub and axial foreign steamer friction plate, lining is arranged.
In technique scheme, on described spring bearer plate, be provided with seam, described spring is a butterfly spring, described spring is between pressing plate and seam.
The present invention forms overload protection through adjusting the moment of torsion that the frictional force that produces on the friction pair changes required (demarcation) between working machine and prime mover; Can be when torque overload occurring, skid automatically and can not cause component wear, therefore needn't shut down renewal part, both improved the safety reliability of equipment operation, improved working efficiency again.During product export, also can demarcate in advance as required the moment of torsion of synchronous pulley transmission, when the load overload, synchronous pulley produces skidding automatically; In case overload is eliminated, can recover again to run well.
Description of drawings:
Fig. 1 is the structural representation of the synchronous pulley of band torque limited of the present invention.
1. wheel hubs among the figure, 2. bearing, 3. cover plate, 4. screw, 5. lock screw; 6. adjusting nut, 7. spring bearer plate, 8. spring, 9. pressing plate, 10. foreign steamer; 11. friction plate, 12. axial baffles, 13. axial foreign steamer friction plates, 14. seams, 15. axle sleeve parts; 16. the wheel body portion, 17. circular holes, 18. linings, 19. degree of tightness holes.
Embodiment
Specify performance of the present invention below in conjunction with accompanying drawing, but do not constitute, only do for example, simultaneously through explanation qualification of the present invention.Advantage of the present invention will become clear more and easy and understand.
Consulting accompanying drawing can know: the synchronous pulley of band torque limited of the present invention; It comprises wheel hub 1 and foreign steamer 10, and described wheel hub 1 is provided with axial baffle 12, and described foreign steamer 10 is provided with axial foreign steamer friction plate 13; Friction plate 11 is arranged between described axial foreign steamer friction plate 13 and described axial baffle 12; Be connected with pressing plate 9 in the outside of wheel hub 1, described friction plate 11 arranged between described axial foreign steamer friction plate 13 and described pressing plate 9, on wheel hub 1, be connected with adjusting nut 6; Between adjusting nut 6 and pressing plate 9, be furnished with spring 8 and the spring bearer plate 7 that is used for holddown spring 8, have lock screw 5 to pass adjusting nut 6.
Described axial baffle 12 is structure as a whole with wheel hub 1 and is vertical with the axle sleeve part 15 on the wheel hub 1, and this structure helps the processing to wheel hub 1.
Described axial foreign steamer friction plate 13 is structure as a whole with foreign steamer 10 and is vertical with the wheel body portion 16 on the foreign steamer 10, and this structure helps the processing to foreign steamer 10.
There is cover plate 3 in the outside at described wheel hub 1 and foreign steamer 10, and described cover plate 3 is fixed on the foreign steamer 10 through screw 4, increase cover plate can blocks dust or other object get in the synchronous pulley, protective action is arranged.
Between described wheel hub 1 and cover plate 3, bearing 2 is arranged, bearing 2 can improve the concentricity of wheel hub 1 and foreign steamer 10, improves the quality of synchronous pulley.
On described spring bearer plate 7, evenly be furnished with circular hole 17; Described lock screw 5 feeds in the circular hole 17; Circular hole 17 is set helps lock screw 5 and further step up spring 8, on the described adjusting nut 6 degree of tightness hole 19 is arranged, two of degree of tightness hole 19 operated by rotary motion; When installation or removal, through tightening or loosening adjusting nut 6 behind the fork wrench insertion degree of tightness hole 19.
Be threaded between described adjusting nut 6 and the wheel hub 1, this linkage structure helps the installation of spring bearer plate and adjusting nut; In addition, pressing plate 9 is installed on the wheel hub 1 with friction plate 11.
Between described wheel hub 1 and axial foreign steamer friction plate 13, lining 18 is arranged, lining 18 can reduce wheel hub 1 and the axially abrasion between the foreign steamer friction plate 13, when big as if lining 18 abrasions, is convenient for changing.
On described spring bearer plate 7, be provided with seam 14; Described spring 8 is a butterfly spring; Described spring 8 is between pressing plate 9 and seam 14, and seam 14 helps the location of butterfly spring and fastening, adopts butterfly spring simultaneously; Effectively alleviated startup, stop with transmission process in impulsive load, guaranteed the accuracy of demarcating.
The present invention is before installing, according to the torque request of working machine, through the adjusting nut angle of swing; Change butterfly spring to the pressure on the friction plate; Thereby change the frictional force between two friction plates and the axial foreign steamer friction plate, demarcated moment of torsion, be installed on prime mover then.When operation torque when demarcating moment of torsion; The frictional force that produces between wheel hub, friction plate, axial foreign steamer friction plate and pressing plate is greater than operation torque; The friction torque of prime mover through producing between axle sleeve, pressing plate, friction plate and the gusset; Be delivered on the synchronous pulley, synchronous pulley is through the working machine of band drive synchronously; When operation torque when demarcating moment of torsion, axially between foreign steamer friction plate and two friction plates generation is skidded, make between synchronous pulley and the wheel hub and dally, thereby cut off the transmission between prime mover and the working machine, protected the safety of motor and equipment.
The present invention can be widely used in machinery, chemical industry, light industry, electronics and numerical control field.