CN2108822U

CN2108822U - Quick variable-pitch mechanism for difference screw

Info

Publication number: CN2108822U
Application number: CN 90218073
Authority: CN
Inventors: 吴光生
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-08-12
Filing date: 1990-08-12
Publication date: 1992-07-01

Abstract

The utility model relates to a quick variable-pitch mechanism for a difference screw, comprising a fixed sliding table seat, a movable sliding table, a main screw pair composed of a nut baffle seat and a nut sheath, an auxiliary screw pair with an inclined face slide block composed of a main slide block in double inclined faces, a half nut slide block in a single inclined face and a screw rod, a plate spring and a baffle frame. The utility model is applied to the working sliding table of a machine tool which is required for accurate positioning or micro feeding. The utility model has the advantages of simple structure, firm parts and convenient operation.

Description

Quick variable-pitch mechanism for difference screw

The utility model relates to a kind of differential screw fast distance adjustor, can be applicable to the quick roll adjustment of some differential screw gearing and needs the lathe work cunning of accurate location or microfeed to close, and can be applicable to aspects such as bench vice, machine vice.

There is slow, the inefficient shortcoming of roll adjustment speed in known helicoidal gear, and these shortcomings are just more outstanding on differential screw gearing, and this has also limited the application of differential screw transmission.Task of the present utility model provides a kind of differential screw fast distance adjustor, and it can overcome above-mentioned shortcoming.

Fast distance adjustor of the present utility model comprises: decide that carriage saddle, moving slide unit, main spiral are paid (being made up of nut block seat and swivel nut), inclined plane slide block pair spiral is paid (being made up of master slider, monocline face half-nut slide block, screw mandrel in the inclined-plane), leaf spring and divider.

Fig. 1 is the lathe working slider with microfeed of can accurately locating of using the utility model fast distance adjustor.One end of screw mandrel 15 by bearing 10 and bearing (ball) cover 9, be installed in the mesopore of moving slide unit 2 end faces, rotate handwheel 1 and can drive screw mandrel 15 rotations and mobile simultaneously with moving slide unit 2, its other end is installed in the mesopore of the end plate 16 that is connected with moving slide unit 2 tail ends by bearing 10; The active section of screw mandrel 15 is processed with the left-handed thread of trapezoidal or notched teeth, has a long keyway in addition on the cylindrical of active section vertically, can slide along feather key 5; Screw mandrel 15 be enclosed within swivel nut 11 with the slippery through hole of screw mandrel 15 external diameters in, this through hole has a short keyway at the end by convex shoulder, feather key 5 usefulness interference fit are installed in this keyway; Be processed with right-handed thread on the cylindrical of swivel nut 11, and screw in the screw of nut block seat 4, nut block seat 4 is screwed on the bottom plane of deciding carriage saddle 14, the end of swivel nut 11 screw threads is equipped with spacing round nut 3, its the other end has the boss shoulder, this convex shoulder is installed in the circular groove of master slider 13 end faces in the double inclined plane with ending plate 12 and screw, can rotate and drive master slider 13 therein and do axial motion, it is secondary slide block that the double inclined plane inner slide is paid by master slider 13 in the double inclined plane and two monocline face half-nut slide block 6() institute forms and (sees Fig. 5,6), main, connect with slippery mutually dovetail groove between secondary slide block, its angle of tilt α=15 °～50 ° (with 30 °～45 ° for well), can slide on the bottom plane of deciding carriage saddle 14 in the bottom plane of master slider 13; Monocline face half-nut 6, at the internal thread that is processed with facing to the inner arc surface of screw mandrel 15 with screw mandrel 15 threads engaged, near this internal thread part of the diameter place of opening, thread being pruned, promptly being that the point of e is the center of circle from external distance internal thread center, outer radius with screw thread is that radius cuts, e must be greater than the tooth depth of this screw thread, on the small end face of monocline face half-nut 6, fix a round head bolt 17(and see Fig. 5), spacing usefulness as half-nut 6, two screws of processing on the side of monocline face half-nut 6, in order to fixed plate spring 7, the other end of leaf spring 7 is screwed on shelves frame 8, shelves frame 8 is screwed on the bottom plane of deciding carriage saddle 14, and in addition, main spiral is paid the pitch of (nut shelves seat 4 and swivel nut 11) screw thread is paid (screw mandrel 15 and half-nut 6) screw thread greater than secondary spiral pitch.

The secondary spiral of this mechanism is repaid and can be adopted monocline face inner slide to pay: a master slider and a monocline face half-nut in the monocline face.

Fig. 1 is the main sectional view that the lathe working slider of application the utility model fast distance adjustor is in releasing orientation.

Fig. 2 is the B-B line sectional view of Fig. 1.

Fig. 3 is the C-C line sectional view of Fig. 2.

Fig. 4 is the D-D line sectional view of Fig. 2.

Fig. 5 is the schematic representation of monocline face half-nut slide block among Fig. 1.

Fig. 6 is the schematic representation of the interior master slider of double inclined plane among Fig. 1.

How the lathe working slider that the quick roll adjustment of the utility model is described below in conjunction with Fig. 1 works:

As Fig. 1, when this working slider is in releasing orientation, master slider 13 and to end plate 12 are the boss that nestle against on nut block seat 4 bases in the double inclined plane, two monocline face half-nut slide blocks 6 apart from the axle center farthest at this moment, make slide unit 2 be in the most loose state, this moment, the moving slide unit 2 of push-and-pull slided vertically fast arbitrarily, coarse adjustment to the inclined to one side T that needs locating point near a side, Y drives screw mandrel 15 drive swivel nut 11Y to rotation to shaking handwheel 1 then, drive master slider 13 simultaneously and make J to motion, this moment, master slider 13 was decomposed into two mutually perpendicular component by the active force that the inclined-plane puts on half-nut 6: one is the reaction force institute balance of leaf spring 7 vertically; Another radially entad, the closed inwards screw thread with screw mandrel 15 of two half-nuts 6 is tentatively meshed, and with screw mandrel 15 be rotated further and fully the engagement, this moment is moving sliding close 2 locked, moving slide unit 2 will be made J to feed movement with the rotation of screw mandrel 15, the amount of feed of moving slide unit 2 is that main spiral is paid the stroke that secondary spiral is paid the differential screw that is constituted, that is moving 1 circle of handwheel 1 revolution, moving slide unit 2J to forward travel distance be that main spiral is paid the poor of pitch that secondary spiral pays, be convenient to be fine-tuning at a slow speed the point of required location like this; Till can also positive and negatively being fine-tuning to satisfaction near this point, though the angle of tilt α that slide block is paid is greater than the friction angle of steel, the anti-accent of trace can't make slide block pay to unclamp, this be because: slide block is paid whether unclamp be the T that depends on frictional force (component vertically) between its inclined-plane and 7 pairs of half-nuts 6 of leaf spring to the pressure sum with drive moving slide unit 2 edges and decide be in axial sliding comparison between the required resistance that overcomes of slide unit 14, when the former during greater than the latter, slide block is just paid and can not unclamped.When needs are made microfeed, can also drive the feeding that moving slide unit 2 is made trace.After task is finished, remove the lock state of moving slide unit 2, (Z to) handwheel 1 need only reverse, make swivel nut 11Z to rotation, drive master slider 13 and make T, make monocline face half-nut slide block 6 be subjected to the two-way pulling force of master slider 13 and leaf spring 7 and open to motion, when master slider 13 and end the protruding backstage that plate 12 touches nut block seat 4, it is motionless that handwheel 1 changes again, and this moment, moving slide unit 2 returned to the most loose state again, so that carry out the work of next round.

Claims

1, a kind of differential screw fast distance adjustor, it comprises decides carriage saddle, moving slide unit, bearing and bearing support thereof, it is characterized in that: (a) form main spiral by nut block seat and swivel nut and pay: the nut block seat is screwed to be decided on the carriage saddle, in the screw of its right-handed thread swivel nut is installed, the end of swivel nut screw thread is equipped with spacing round nut, its the other end has the boss shoulder, with ending plate and screw it is installed in the circular groove of master slider end face in the double inclined plane, the center hole of swivel nut is and the slippery unthreaded hole of screw mandrel external diameter, end at convex shoulder has a short keyway, and feather key is contained in this keyway with interference fit; (b) forming the secondary spiral of inclined plane slide block by master slider, monocline face half-nut slide block and screw mandrel in the double inclined plane pays: connect with mutual slippery dovetail groove between master slider and two the monocline face half-nut slide blocks in the double inclined plane, its angle of tilt is 15 °～50 ° (with 30 °～45 ° for well); The two ends of screw mandrel all by Bearing Installation in the mesopore at moving slide unit two ends, screw mandrel also is enclosed within the mesopore of swivel nut; (c) leaf spring and divider thereof: an end of leaf spring is screwed on the side of monocline face half-nut, and the other end is screwed on the shelves frame, and divider also is screwed and is deciding on the bottom plane of carriage saddle.

2, fast distance adjustor according to claim 1 is characterized in that screw mandrel is processed with the left-handed thread of trapezoidal or notched teeth at active section, has a long keyway in addition on the cylindrical of active section vertically, and is slippery with feather key.

3, fast distance adjustor according to claim 1, it is characterized in that monocline face half-nut slide block, its inner arc surface facing to screw mandrel is processed with the screw thread that matches with wire rod thread, near this internal thread part of the diameter place of opening, thread being pruned, promptly being that the point of e is the center of circle from external distance internal thread center, outer radius with screw thread is that radius cuts, and e is greater than the tooth height of this screw thread; Be fixed with a round head bolt on the small end face of monocline face half-nut slide block; On the side of monocline face half-nut slide block, be processed with two screws.

4,, it is characterized in that the pitch that pitch that main spiral is paid is paid greater than secondary spiral according to claim 1 and 2 described fast distance adjustors.