CN221517394U - Follow-up chuck special for crankshaft machining - Google Patents

Abstract

The utility model discloses a special follow-up chuck for crankshaft machining, which belongs to a machine tool accessory, and comprises a front end cover, an eccentric clamping jaw, a shaft sleeve, an inner jacket and an outer jacket, wherein the shaft sleeve, the inner jacket and the outer jacket are sequentially arranged from inside to outside; the eccentric clamping jaw comprises a stirring part and an eccentric disc part which are connected into a whole, the eccentric disc part is provided with an eccentric through hole, the through hole is internally penetrated with a rotating shaft to support the eccentric clamping jaw to swing, all the rotating shafts are distributed in the circumferential direction and synchronously rotate along with the inner jacket, the stirring part is provided with a long slot hole, the front end of the outer jacket is provided with at least three guide pins, each guide pin corresponds to one eccentric clamping jaw, the guide pins are penetrated in the long slot hole, the circumferential direction of the position, which is closest to the circle center and is formed by the circumference of the outer circumferential surface of the eccentric disc part, is surrounded with a clamping hole, and the diameter of the clamping hole is regulated by the asynchronous rotation of the inner jacket and the outer jacket.

Description

Follow-up chuck special for crankshaft machining

Technical Field

The utility model belongs to the technical field of machine tool accessories, and particularly relates to a special follow-up chuck for crankshaft machining.

Background

The grinding process of the crankshaft usually adopts double-thimble supporting clamping and is matched with a follow-up chuck. The existing follow-up chucks are all clamped manually, clamping is performed by stirring clamping jaws through operators during feeding and discharging, and full automation cannot be achieved.

Disclosure of utility model

The utility model aims to overcome the defect that the existing follow-up chuck for crankshaft machining needs manual operation of clamping jaws, and provides a special follow-up chuck for crankshaft machining, which can realize full-automatic loosening and clamping.

For this purpose, the utility model adopts the following technical scheme: the special follow-up chuck for crankshaft machining is characterized by comprising a front end cover, an eccentric clamping jaw, a shaft sleeve, an inner jacket and an outer jacket, wherein the shaft sleeve, the inner jacket and the outer jacket are sequentially arranged from inside to outside; the eccentric clamping jaw comprises a stirring part and an eccentric disc part which are connected into a whole, the eccentric disc part is provided with an eccentric through hole, the eccentric disc of the eccentric clamping jaw forms a large side and a small side due to the eccentricity of the through hole, the stirring part of the eccentric clamping jaw is provided with a long slot hole, the front end of the outer clamping sleeve is provided with at least three guide pins, each guide pin corresponds to one eccentric clamping jaw, the guide pins are arranged in the long slot hole of the eccentric clamping jaw in a penetrating way, the through hole of the eccentric clamping jaw is provided with a rotating shaft in a penetrating way, the eccentric clamping jaw is supported by the rotating shaft to swing, all the rotating shafts are distributed in the circumferential direction and synchronously rotate along with the inner clamping sleeve, and the circumferential direction of the outer circumferential surface of the eccentric disc part is circumferentially enclosed into a clamping hole from the nearest position of the circle center enclosed by the rotating shaft; the front end cover is provided with a central through hole and is fixedly arranged at the front end of the outer jacket, the diameter of the central through hole is larger than the maximum diameter of the clamping hole, the front end cover is provided with a groove corresponding to the eccentric clamping jaw, and the eccentric clamping jaw is positioned in the groove, limited by the front end cover in the circumferential direction and guided by radial movement; the rear end of the outer jacket is provided with a follow-up connecting mechanism.

When the device is used, the shaft sleeve is sleeved on the thimble and performs axial and circumferential limiting through the set screw, the outer jacket is connected with the hollow main shaft of the machine tool through the follow-up connecting mechanism, the outer jacket rotates along with the main shaft of the machine tool, the thimble is fixedly arranged in the fixed shaft in the hollow inner cavity of the main shaft in a penetrating way, the thimble is fixed, and the shaft sleeve is also fixed. When the follow-up chuck rotates positively, the bearing and the one-way bearing can rotate, the outer jacket and the inner jacket can rotate along with the main shaft of the machine tool, the large side of the eccentric disc is positioned on the inner side of the eccentric disc, the diameter of a clamping hole surrounded by the eccentric disc is reduced, the large side of the eccentric disc contacts and clamps the end part of the crankshaft supported by the thimble, and the crankshaft is clamped by the follow-up chuck to rotate positively for processing. After the machining is finished, the rotation is stopped firstly, then the main shaft of the machine tool drives the outer jacket to rotate reversely by a small angle, the inner jacket cannot rotate reversely under the action of the unidirectional bearing, the driving part of the eccentric clamping jaw swings reversely under the drive of the outer jacket, the small side of the eccentric disc part rotates to the centripetal inner side along with the driving part, the large side rotates to the outer side along with the rotation, the diameter of the clamping hole is enlarged, the large side of the eccentric disc part is separated from the end part of the crankshaft, the small side of the eccentric disc part is not contacted with the end part of the crankshaft, the end part of the crankshaft is not clamped, and the crankshaft can be disassembled. After a new crankshaft is replaced, when a main shaft of the machine tool is started, the outer jacket is driven to rotate positively, the inner jacket is still motionless, the outer jacket drives the eccentric clamping jaw shifting part to swing, the large side of the eccentric disc part is rotated to the inner side of the eccentric disc part, the end part of the crankshaft is contacted and clamped, and after clamping is completed, the inner jacket and the crankshaft are driven to rotate in a follow-up mode through the eccentric clamping jaw.

The utility model also comprises the following technical characteristics as supplement and improvement of the technical scheme.

The follow-up chuck also comprises an eccentric adjusting ring and a limiting ring, the inner diameter of the eccentric adjusting ring is larger than the maximum diameter of the clamping hole, the rotating shaft is installed on the eccentric adjusting ring, three radial grooves which are arranged along the circumferential equal angle are formed in the front end of the inner clamping sleeve, three limiting pieces which correspond to the radial grooves are arranged on the eccentric adjusting ring, the limiting pieces are inserted into the radial grooves to form clearance fit, the limiting pieces are used for carrying out circumferential limiting and radial movement guiding on the relative positions of the eccentric adjusting ring and the inner clamping sleeve, an annular groove is formed in the outer circumferential surface of the eccentric adjusting ring, the limiting ring is fixedly installed at the front end of the inner clamping sleeve, an inner convex ring which is in clearance fit with the annular groove is arranged on the wall of the limiting ring, and the inner convex ring stretches into the annular groove to carry out axial limiting on the relative positions of the eccentric adjusting ring and the inner clamping sleeve, so that the eccentric adjusting ring can move radially relative to the inner clamping sleeve, and the eccentric clamping jaw can be adjusted when the crankshaft is clamped.

A water retaining ring is arranged between the front end of the shaft sleeve and the inner wall of the inner jacket, a water retaining ring is arranged between the inner wall of the rear end of the outer jacket and the shaft sleeve, and machining cooling water is prevented from entering the bearing and the one-way bearing through the water retaining ring, so that a protection effect is achieved.

The utility model can achieve the following beneficial effects: a plurality of eccentric clamping jaws which are circumferentially distributed are respectively supported by an outer clamping sleeve rotating by a random bed spindle and the front end of an inner clamping sleeve to form clamping holes, the outer clamping sleeve and the inner clamping sleeve which cannot be reversed form a rotation angle difference to drive the swing of the eccentric clamping jaws to realize the aperture change of the clamping holes, so that the full-automatic clamping and loosening of a crankshaft are realized, the eccentric adjusting ring is adapted to the eccentricity of the clamping holes, and the clamping precision and the product adaptability are improved.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic diagram of the front view direction structure of the present utility model.

Fig. 3 is a cross-sectional view taken along A-A of fig. 2.

Fig. 4 is a B-B cross-sectional view of fig. 2.

Fig. 5 is a schematic perspective view of the hidden front end cover of the present utility model.

FIG. 6 is a schematic view of the structure of the inner jacket in the present utility model.

Fig. 7 is a schematic structural view of the eccentric adjusting ring in the present utility model.

Detailed Description

The following detailed description of specific embodiments of the utility model is provided in connection with the accompanying drawings, and the examples described are merely illustrative and explanatory of the utility model, and are not intended to be the only limitation of the utility model.

As shown in fig. 1 to 7, the utility model discloses a special follow-up chuck for crankshaft machining, which comprises a front end cover 3, an eccentric clamping jaw 4, an eccentric adjusting ring 6, a limiting ring 7, and a shaft sleeve 10, an inner jacket 5 and an outer jacket 2 which are sequentially arranged from inside to outside. The rear end of the outer jacket 2 is supported and installed with the shaft sleeve 10 through a bearing 12, the inner jacket 5 is positioned in the inner cavity of the outer jacket 2, and the rear end of the inner jacket is supported and installed with the shaft sleeve 10 through a one-way bearing 8. The front end of the shaft sleeve is provided with a convex shaft shoulder to form a backward end face leaning shoulder, and the rear end is provided with a snap spring groove. A spacer bush is arranged between the unidirectional bearing 8 and the inner ring of the bearing fee 2, the inner ring of the unidirectional bearing 8 is axially limited at one end by the end face of the front end of the shaft sleeve against a shoulder, and the rear end of the shaft sleeve is sleeved with the spacer bush and the snap spring to axially limit the other end of the inner ring of the unidirectional bearing 8 and the inner ring of the bearing 12. The inner wall of the rear end of the outer jacket is provided with a snap spring groove and an inward convex shaft shoulder, and the outer ring of the bearing 12 is axially limited through the snap spring and the shaft shoulder in the snap spring groove. The inner wall of the rear end of the inner jacket is provided with a clamp spring groove and a backward end face leaning shoulder, and the clamp spring and the end face leaning shoulder in the clamp spring groove axially limit the outer ring of the one-way bearing 8.

The eccentric clamping jaw 4 comprises a stirring part 42 and an eccentric disc part 41 which are connected into a whole, wherein the eccentric disc part is provided with an eccentric through hole, the eccentric disc of the eccentric clamping jaw forms a large side and a small side due to the eccentric of the through hole, and the stirring part 42 of the eccentric clamping jaw is provided with a long slot 43. The front end of the outer jacket is provided with three guide pins 15, each guide pin corresponds to one eccentric clamping jaw 4, and the guide pins 15 penetrate through long groove holes 43 of the eccentric clamping jaws. The front end of the inner jacket 5 is provided with three radial grooves 51 which are arranged along the circumferential equiangular direction, the eccentric adjusting ring 6 is provided with three limiting pieces 14 which correspond to the radial grooves, the limiting pieces 14 are flat head screws, the eccentric adjusting ring 6 is provided with 3 screw holes 62, the limiting pieces are screwed into the screw holes 62 arranged on the eccentric adjusting sleeve and inserted into the radial grooves to form clearance fit, the relative positions of the eccentric adjusting ring and the inner jacket are circumferentially limited and radially moved and guided by the limiting pieces, the outer circumferential surface of the eccentric adjusting ring 6 is provided with an annular groove 61, the limiting ring 7 is fixedly installed at the front end of the inner jacket 5 through screw fastening, the inner hole wall of the limiting ring 7 is provided with an inner convex ring which forms clearance fit with the annular groove 61, and the inner convex ring stretches into the annular groove to axially limit the relative positions of the eccentric adjusting ring and the inner jacket.

The end face of the eccentric adjusting ring 6 is provided with 3 eccentric disc part accommodating grooves, the bottom surface of the groove is provided with a shaft hole 63, the eccentric disc parts of the eccentric clamping jaws are accommodated in the eccentric disc part accommodating grooves, the shaft holes 63 and through holes of the eccentric disc parts are penetrated with rotating shafts 11, all the rotating shafts are circumferentially distributed along the circumference of the eccentric adjusting ring, and the eccentric clamping jaws are supported by the rotating shafts to swing and are driven by the eccentric adjusting ring to synchronously rotate along with the inner jacket. The periphery of the eccentric disc part is circumferentially surrounded by a clamping hole at the position closest to the circle center surrounded by the rotating shaft; the inner diameter of the eccentric adjusting ring is larger than the maximum diameter of the clamping hole. The eccentric adjusting ring can move radially relative to the inner jacket, and can be eccentrically adjusted when the eccentric clamping jaw clamps the crankshaft. The front end cover 3 is provided with a central through hole and is fixedly arranged at the front end of the outer jacket 2, the diameter of the central through hole is larger than the maximum diameter of the clamping hole, the front end cover is provided with a groove corresponding to the eccentric clamping jaw, and the eccentric clamping jaw is positioned in the groove, limited by the circumference of the front end cover and moves radially and guides; the rear end of the outer jacket is provided with a follow-up connecting groove 21, a follow-up connecting rod is arranged on the machine tool spindle, and the follow-up connecting rod and the follow-up connecting groove 21 form a follow-up connecting mechanism to connect the follow-up chuck and the machine tool spindle.

The front end of the shaft sleeve is sleeved with a first water blocking ring 13, and the first water blocking ring 13 is movably contacted with the inner wall of the inner jacket. The spacer bush outside the shaft sleeve is sleeved with a second water blocking ring 9, and the second water blocking ring 9 is movably contacted with the inner wall of the rear end of the outer jacket. The two water retaining rings can prevent the machining cooling water from entering the bearing and the one-way bearing, so that the protection effect is achieved.

Corresponding screw holes are formed in the rear end of the shaft sleeve, the spacer bush of the outer sleeve and the thimble 1, and a set screw is screwed in the screw holes to limit the shaft sleeve and the thimble axially and circumferentially.

Claims (3)

1. The special follow-up chuck for crankshaft machining is characterized in that: the follow-up chuck comprises a front end cover, an eccentric clamping jaw, a shaft sleeve, an inner jacket and an outer jacket, wherein the shaft sleeve, the inner jacket and the outer jacket are sequentially arranged from inside to outside; the eccentric clamping jaw comprises a stirring part and an eccentric disc part which are connected into a whole, the eccentric disc part is provided with an eccentric through hole, the eccentric disc of the eccentric clamping jaw forms a large side and a small side due to the eccentricity of the through hole, the stirring part of the eccentric clamping jaw is provided with a long slot hole, the front end of the outer clamping sleeve is provided with at least three guide pins, each guide pin corresponds to one eccentric clamping jaw, the guide pins are arranged in the long slot hole of the eccentric clamping jaw in a penetrating way, the through hole of the eccentric clamping jaw is provided with a rotating shaft in a penetrating way, the eccentric clamping jaw is supported by the rotating shaft to swing, all the rotating shafts are distributed in the circumferential direction and synchronously rotate along with the inner clamping sleeve, and the circumferential direction of the outer circumferential surface of the eccentric disc part is circumferentially enclosed into a clamping hole from the nearest position of the circle center enclosed by the rotating shaft; the front end cover is provided with a central through hole and is fixedly arranged at the front end of the outer jacket, the diameter of the central through hole is larger than the maximum diameter of the clamping hole, the front end cover is provided with a groove corresponding to the eccentric clamping jaw, and the eccentric clamping jaw is positioned in the groove, limited by the front end cover in the circumferential direction and guided by radial movement; the rear end of the outer jacket is provided with a follow-up connecting mechanism.

2. The special follow-up chuck for crankshaft machining according to claim 1, wherein: the follow-up chuck also comprises an eccentric adjusting ring and a limiting ring, wherein the inner diameter of the eccentric adjusting ring is larger than the maximum diameter of the clamping hole, the rotating shaft is installed on the eccentric adjusting ring, three radial grooves which are arranged along the circumferential direction at equal angles are formed in the front end of the inner jacket, three limiting pieces which correspond to the radial grooves are arranged on the eccentric adjusting ring, the limiting pieces are inserted into the radial grooves to form clearance fit, the relative positions of the eccentric adjusting ring and the inner jacket are circumferentially limited and radially moved and guided by the limiting pieces, an annular groove is formed in the outer circumferential surface of the eccentric adjusting ring, the limiting ring is fixedly installed at the front end of the inner jacket, an inner convex ring which is in clearance fit with the annular groove is arranged on the wall of the limiting ring, and the inner convex ring stretches into the annular groove to axially limit the relative positions of the eccentric adjusting ring and the inner jacket.

3. The special follow-up chuck for crankshaft machining according to claim 1, wherein: a water blocking ring is arranged between the front end of the shaft sleeve and the inner wall of the inner jacket, and a water blocking ring is arranged between the inner wall of the rear end of the outer jacket and the shaft sleeve.