CN2043902U

CN2043902U - Self-centering gap-free three-jaw chuck

Info

Publication number: CN2043902U
Application number: CN 88211789
Authority: CN
Inventors: 邹企范
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-05-18
Filing date: 1988-05-18
Publication date: 1989-09-06

Abstract

The utility model relates to a self-centering gap-free three-jaw chuck. The best engaging state of the self-centering gap-free three-jaw chuck and a large cone gear can be achieved by regulating a small cone gear. A clamping body is driven by the large cone gear to generate axial displacement. The goal that a sliding bevel structure drives a claw to move along the radial direction on a chuck body to clamp workpieces is achieved. A flat head rolling needle with high precision is arranged between the clamping body and the chuck body to achieve the function of the gap-free self-centering. The utility model has the advantages of novel structure, strong clamping force, high centering, convenient, safe and reliable operation and long service life, and the processing precision is greatly increased.

Description

Self-centering gap-free three-jaw chuck

The utility model is a kind of at Metal Cutting Machine Tool---the lathe head of a bed anchor clamps scroll chuck of extensive use on the lathe.

Existing scroll chuck, be to rotate the little garden bevel gear that is arranged in the chuck body with spanner to drive big garden bevel gear, the square helical driving claw that is driven on the claw medial surface by the square helical on the back side of big garden bevel gear moves the purpose that reaches chucking workpiece (or unclamping workpiece) as warp-wise.But the square helical on the back side of the big garden bevel gear of existing scroll chuck contacts with the square helical on the claw medial surface and is the line contact, so contact area is little, unit pressure is big, the sliding friction that produces when chucking is worn and torn the square helical easily, also official post machining accuracy of centering degree is carried not high, and certain placing restrictions on also arranged the service life of claw.

It is big that the purpose of this utility model provides a kind of clamping force, centering degree height, the scroll chuck of the novel structure that high and easy to use and life-span of machining accuracy is long.

Structural principle of the present utility model is equipped with big garden bevel gear 5 and little garden bevel gear 22 that modulus equates as shown in Figure 1 at the rear portion of chuck body 6, adjustable bearing holder (housing, cover) 21 is housed on little garden bevel gear 22.Adorn a split ring back-up ring 20 between little garden bevel gear 22 and the bearing holder (housing, cover) 21, its effect is to make little garden bevel gear 22 follow bearing holder (housing, cover) 21 when regulating shaft bearing sleeve 21 to move to reach with big garden bevel gear 5 and be engaged on no gap state.And then backward rotation bearing holder (housing, cover) 21 makes its end face groove move 1～3 lattice and axially align with chuck body 6 and to refill holding

screw

19,18 and just can reach the due back lash of garden awl tooth.On the big garden bevel gear 5 bearing block 7 is housed, between bearing block 7 and big garden bevel gear 5, friction plate 4 is housed.The back door 1 of chuck body 6 and chuck body 6 be for being threaded, for prevent back door 1 after tightening, do not become flexible open at the outer-diameter threads place of back door 1 a circle locking slot with sunk screw 3 with its locking.Between back door 1 and big garden bevel gear 5, put a friction plate 2.Friction plate 2 and friction plate 4 play damping action to big garden bevel gear 5 simultaneously, cause the clamping force unstability of claw 10～11 when rotating at a high speed or when stopping suddenly or weaken to prevent scroll chuck.Big garden bevel gear 5 is threaded for the T type with clamping body 15, and clamping body 15 and interior claw 26 are slidingly connected for inclined-plane T-shape groove, and its inclined-plane becomes 16 °～20 ° angles with axis.Tack 0 class precision needle roller 16 pack between clamping body 15 and the chuck body 6 into so that clamping body 15 moves flexibly and steadily in chuck body 6, guarantee its running accuracy.

Interior claw 26 is one group of parts.Be built-in with slide block 23 and take-up housing 25 and at two flat keys 24 of 23 liang of sides of slide block at interior claw 26.Slide block 23 becomes 7 °～12 ° dovetail groove to be slidingly connected with take-up housing 25 usefulness with warp-wise, regulate it when slide block 23 by adjustment screw 9 and move along warp-wise, promotes take-up housing 25 and moves vertically, the medial surface of the lateral surface of take-up housing and claw 10～11 is close to or unclamps.Adjustment screw 9 is a soket head cap screw, and the outer semi-round groove of garden car of hexagonal is opened hole, two gardens on interior claw 26 tops and semi-round groove relevant position within it, inserts garden pin 8, makes adjustment screw 9 not produce warp-wise when regulating rotation in interior claw and moves.Compression spring 13 is put in slide block 23 lower ends, to increase the self-locking action of slide block 23 and take-up housing 25 dovetail groove junctions.Be with fine-tooth pattern on the lateral surface of take-up housing 25, carry out serration when being close to and be connected with a joggle, almost fuse with fine-tooth pattern on the medial surface of claw 9～10.Claw 9～10 assemblies have scale in the outside of claw 9～10 in the typing groove of interior claw 26 and chuck body end cap 17, can select its position according to the size of workpiece.Chuck body end cap 17 and chuck body 6 usefulness soket head cap screw 27(Fig. 2) fix plug screw 28(Fig. 2 silently) opposite with soket head cap screw 27 screw threads, play locking effect.Garden taper pin 12 plays the role of positioning.

The utility model has following accompanying drawing:

Fig. 1 is the utility model structure principle chart.

Fig. 2 is the utility model profile.

Fig. 3 is take-up housing 25 part drawings.

Fig. 4 is slide block 23 part drawings.

Fig. 5 is anti-claw 10 part drawings.

Fig. 6 is formal pawl 11 part drawings.

Fig. 7 is door 1 part drawing behind the chuck body.

Fig. 8 is bearing holder (housing, cover) 21 part drawings.

Fig. 9 is split ring back-up ring 20 part drawings.

The utility model embodiment is as depicted in figs. 1 and 2:

After part of the present utility model assembled by Fig. 1 and Fig. 2, regulating shaft bearing sleeve 21 made little garden bevel gear 22 and big garden bevel gear 5 reach engagement fully.With door behind the chuck body 1 tighten on the chuck body 6 the friction shim of making by polytetrafluoroethylene (PTFE) 2 with big bevel gear 5 both sides, garden be close to the back with sunk screw 3 chuck body after door 1 locking, with limit axial left and right sides play that big garden bevel gear 5 produces when rotating at a high speed with prevent chuck in high-speed starting or when stopping suddenly by the clamping force unstability that makes claw that inertia force was brought or weaken phenomenon.

Adjustment screw 9 is unclamped, make slide block 23 move inward fine-tooth pattern and claw 10(or 11 with take-up housing 25 lateral surfaces along warp-wise) after fine-tooth pattern engagement on the medial surface throws off, mobile claw 10(or 11 in the typing groove of chuck body end cap 17) position (by three pawls of the scale size adjustment on the claw identical radially move distance, guarantee concentricity), tighten fine-tooth pattern and claw 10(or 11 that adjustment screw 9 makes take-up housing 25 lateral surfaces then) to be close to engagement be one for fine-tooth pattern on the medial surface.Adapt to the workpiece of processing and clamping different-diameter with this.

With inner hexagon spanner little garden bevel gear 22 is pulled and to make it drive big garden bevel gear 5 in bearing block 7, to rotate along the rotation of (or anti-) clockwise.Because big garden bevel gear 5 and clamping body 15 are connected for trapezoidal fine thread, when big garden bevel gear 5 when just (instead) rotating, drive clamping body 15 preceding vertically in chuck body 6 (or after) is mobile.When clamping body 15 preceding vertically (or back) was mobile, under the effect that inclined-plane T-shape groove connects, the interior claw 26 of promotion was made warp-wise outside (or interior) and is moved in the chute of chuck body 6.Because claw 10(or 11) assembly is in the typing groove of interior claw 26 and chuck body end cap 17 junctions, at interior claw 26 lateral surface and claw 10(or 11 at take-up housing 25 when outwards (or interior) is mobile along warp-wise) medial surface on the effect that is connected with a joggle of fine-tooth pattern under, promote claw 10(or 11) with interior claw 26 synchronously radially outwards (or interior) move, make and be clipped in claw 10(or 11) on the part that is coupled with clamp or unclamp, reach the purpose that design is used.

The utility model is through after implementing, and its leading indicator can reach:

The clamping work pieces scope is φ 8～φ 200.

The precision of processing work (concentricity)＜0.02mm.

Static maximum clamping force＞4000kg.

Dynamically maximum clamping force (2000 rev/mins of rotating speeds) is 2500～3000kg.

The utility model has the advantage of rational in infrastructurely, clamping force is big, and centering degree height is easy to operate and safe and reliable, and long service life can improve the machining accuracy of lathe significantly.

Claims

1, a kind of scroll chuck of forming by claw, chuck body and clamping body etc., it is characterized in that being equipped with in its chuck body 6 a big garden bevel gear 5 and three little garden bevel gears 22 that equate with the modulus of big garden bevel gear 5 and interior claw 26, back door 1 and drive end bearing bracket 17 are housed at the two ends of chuck body 6.

2,, it is characterized in that between clamping body 15 and chuck body 6 for radially there being the gap assembling centre tack 0 class precision needle roller 16 of packing into by the described scroll chuck of claim 1.

3, by the described scroll chuck of claim 1, it is characterized in that claw 26 adopts inclined-plane T-shape groove to be slidingly connected with clamping body 15 in it, its inclined-plane becomes 16 °～20 ° angles with axis.

4, by claim 1,3 described scroll chucks, it is characterized in that in interior claw 26, being equipped with slide block 23 and take-up housing 25, slide block 23 adopts with take-up housing and becomes the dovetail groove of 7 °～12 ° of angles to be slidingly connected (Fig. 3) with warp-wise, is equipped with fine-tooth pattern (Fig. 4) on the lateral surface of take-up housing 25.

5, by claim 1,3 described scroll chucks, it is characterized in that its claw 10(or 11) medial surface on be equipped with the corresponding fine-tooth pattern of fine-tooth pattern (Fig. 5,6) on the lateral surface with take-up housing 25, be connected with a joggle to reach with take-up housing 25.

6, by the described scroll chuck of claim 1, it is characterized in that its little garden bevel gear 222 the axle on the bearing holder (housing, cover) 21 that can regulate is housed, the outer rim of bearing holder (housing, cover) 21 is threaded with chuck body 6 usefulness serrations, and has two driving holes (Fig. 8) on the center line of bearing holder (housing, cover) outer face.

7, by claim 1,6 described scroll chucks, it is characterized in that it opens a square groove between the mating surface of little garden bevel gear 22 and bearing holder (housing, cover) 21, put into the check ring 20 of an opening in this square groove.(Fig. 9)

8, by the described scroll chuck of claim 1, the degree of depth that it is characterized in that opening on the outer rim fine thread of door 1 behind its chuck body circle locking slot (Fig. 7) locking slot is can make door 1 to be locked on the chuck body 6 be as the criterion.

9, by claim 1,8 described scroll chucks, it is characterized in that it respectively is being equipped with friction plate 2 and 4(Figure 10 that a tetrafluoroethene generates between door 1 between big garden bevel gear 5 and the bearing block 7 and behind big garden bevel gear 5 and the chuck body).