CN210023816U

CN210023816U - Three-jaw chuck

Info

Publication number: CN210023816U
Application number: CN201920767271.8U
Authority: CN
Inventors: 瞿涛
Original assignee: Sichuan Haoyuan Electromechanical Co Ltd
Current assignee: Sichuan Haoyuan Electromechanical Co Ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-02-07
Anticipated expiration: 2029-05-27

Abstract

The utility model discloses a three-jaw chuck, which relates to the technical field of mechanical fixtures and solves the problems that the prior three-jaw chuck adopts plane threads to drive jaws, and the existing plane threads are difficult to process, easy to wear and difficult to replace after being worn, the utility model comprises a base, a cylindrical chuck body is arranged at the center of the upper surface of the base, three radial clamping grooves are arranged on the upper surface of the chuck body, jaws are arranged in the clamping grooves, transmission cavities are arranged in the corresponding chuck bodies below the three clamping grooves, radial openings communicated with the transmission cavities are arranged at the bottoms of the clamping grooves, protrusions passing through the openings downwards are arranged at the bottoms of the jaws, a transmission mechanism for driving the jaws to move radially is arranged in the transmission cavities, the transmission mechanism comprises a gear and a connecting rod, one end of the connecting rod is hinged at the edge of the surface of the gear, the other end of the connecting rod is hinged with, the inner ring of the worm wheel in the worm wheel and worm mechanism is provided with an inner ring gear structure which is matched with the three gears simultaneously.

Description

Three-jaw chuck

Technical Field

The utility model relates to a mechanical fixture technical field, more specifically relate to a three-jaw chuck.

Background

The clamp is an important tool in the machining process and is used for fixing a workpiece to be machined, so that the workpiece can be conveniently machined. The three-jaw chuck is one of various clamps, and is mainly used for fixing a workpiece by using three movable jaws, and is generally used for fixing a cylindrical workpiece to perform turning, so the three-jaw chuck is generally used together with a lathe.

The movable clamping jaws on the existing three-jaw chuck are mainly moved through plane threads, the three movable clamping jaws are matched with the plane threads on the base, and when the base rotates, the movable clamping jaws move radially under the action of the plane threads. The workpiece is placed in the center among the three movable clamping jaws, and the workpiece is clamped by radial movement of the movable clamping jaws.

The existing three-jaw chuck has several defects, firstly, the processing difficulty of the plane thread is higher, which means the high-precision processing of the plane thread, and because the distances of synchronous radial movement of three movable jaws of the single-jaw chuck are equal, the high-precision plane thread is needed; secondly, the contact surface between the movable jaw and the plane thread is large, the plane thread can generate friction with the movable jaw when rotating, the plane thread is easy to abrade in the long-term use process, the precision of the plane thread is reduced, and the movable jaw is also easy to abrade; finally, the worn movable jaw is easier to replace, but once the flat thread is worn, the whole base with flat thread needs to be replaced, which is almost equivalent to scrapping.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: in order to solve current three-jaw chuck and adopt plane screw thread drive jack catch, the plane screw thread processing difficulty of existence, the problem that is difficult to change after wearing and tearing, the utility model provides a three-jaw chuck.

The utility model discloses a realize above-mentioned purpose and specifically adopt following technical scheme:

the utility model provides a three-jaw chuck, the on-line screen storage device comprises a base, base upper surface center is provided with the columniform chuck body, three radial draw-in grooves have been seted up to chuck body upper surface, be provided with the jack catch in the draw-in groove, the transmission chamber has all been seted up to the chuck body inside that three draw-in grooves below correspond, the radial opening in intercommunication transmission chamber is seted up to the draw-in groove bottom, the jack catch bottom is provided with the arch that passes the open-ended downwards, be provided with the drive mechanism who is used for driving jack catch radial movement in the transmission chamber, drive mechanism includes gear and connecting rod, connecting rod one end articulates at gear surface edge, the other end is articulated with the arch, gear among the three drive mechanism drives through same worm gear mechanism, worm.

Furthermore, the inner diameter of a worm wheel in the worm wheel and worm mechanism is larger than the outer diameter of the chuck body, namely the meshing part of the inner ring of the worm wheel and the gear is positioned outside the transmission cavity.

Furthermore, an annular protection edge is arranged on the edge of the upper surface of the base, an annular cavity is formed between the protection edge and the chuck body, and the worm wheel is arranged in the cavity.

Furthermore, a cover plate used for sealing the top of the cavity is arranged above the cavity and fixedly connected with the protective edge through bolts, and a plurality of bolt holes are formed in the top surface of the protective edge.

Furthermore, three oil injection holes are formed in the cover plate and correspond to the meshing position of the inner ring of the worm gear and the gear.

The utility model has the advantages as follows:

the utility model provides a gear, worm gear can all adopt the standard component, and its processing technology is very mature, and the precision is also higher. Meanwhile, the gear, the worm and gear, the base and the chuck body are detachably matched, and even if part of components are abraded, the gear, the worm and gear, the base and the chuck body can be correspondingly and independently replaced. The chuck cannot be scrapped once the plane thread is worn like the existing three-jaw chuck with the plane thread; thereby improving the flexibility of the chuck maintenance and replacement and prolonging the service life of the chuck.

Drawings

Fig. 1 is a schematic view (overhead view) of the internal structure of the present invention;

fig. 2 is a schematic view (top view) of the external structure of the present invention;

reference numerals: 1-worm gear and worm mechanism, 1.1-worm, 1.2-worm gear, 2-claw, 3-clamping groove, 4-base, 5-opening, 6-clamping disc body, 7-transmission cavity, 8-bulge, 9-transmission mechanism, 9.1-connecting rod, 9.2-gear, 10-bolt hole, 11-cavity, 12-protection edge, 13-cover plate and 14-oil injection hole.

Detailed Description

For a better understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and the following embodiments.

Example 1

A three-jaw chuck comprises a base 4, a cylindrical chuck body 6 is arranged at the center of the upper surface of the base 4, three radial clamping grooves 3 are arranged on the upper surface of the chuck body 6, clamping jaws 2 are arranged in the clamping grooves 3, transmission cavities 7 are arranged in the corresponding clamping chuck bodies 6 below the three clamping grooves 3, radial openings 5 communicated with the transmission cavities 7 are arranged at the bottoms of the clamping grooves 3, protrusions 8 downwards penetrating through the openings 5 are arranged at the bottoms of the clamping jaws 2, a transmission mechanism 9 used for driving the clamping jaws 2 to move radially is arranged in the transmission cavities 7, the transmission mechanism 9 comprises a gear 9.2 and a connecting rod 9.1, one end of the connecting rod 9.1 is hinged on the surface edge of the gear 9.2, the other end is hinged with the bulge 8, gears 9.2 in the three transmission mechanisms 9 are driven by the same worm and gear mechanism 1, and inner rings of worm gears 1.2 in the worm and gear mechanism 1 are provided with inner gear ring structures which are simultaneously matched with the three gears 9.2.

The working principle is as follows: when the clamping jaw mechanism is used, the worm 1.1 in the worm gear mechanism 1 drives the worm wheel 1.2 to rotate, the worm wheel 1.2 drives the gear 9.2 in the transmission mechanism 9 to rotate through the inner ring gear structure of the inner ring of the worm wheel 1.2, the gear 9.2 horizontally rotates around the axis of the gear, and then the clamping jaw 2 is driven by the connecting rod 9.1 to move back and forth along the clamping groove 3, so that a workpiece is fixed. Worm wheel 1.2 cooperates with three drive mechanism 9 simultaneously, and then worm wheel 1.2 can drive 3 jack catchs 2 simultaneously and carry out the adjustment of position, realizes the automatic centering function of three-jaw chuck.

Example 2

The embodiment is improved on the basis of embodiment 1:

in order to further facilitate the maintenance of the worm gear mechanism 1, the inner diameter of the worm wheel 1.2 in the worm gear mechanism 1 is set to be larger than the outer diameter of the chuck body 6, namely, the meshing part of the inner ring of the worm wheel 1.2 and the gear 9.2 is positioned outside the transmission cavity 7, so that whether the meshing of the inner ring of the worm wheel 1.2 and the gear 9.2 is accurate or not can be observed more visually, and the worm wheel 1.2 can be conveniently installed and detached.

The edge of the upper surface of the base 4 is provided with an annular protective edge 12, an annular cavity 11 is formed between the protective edge 12 and the chuck body 6, and the worm wheel 1.2 is arranged in the cavity 11. The protective edge 12 plays a certain role in protecting the worm wheel 1.2 from external interference.

In order to improve the whole sealing performance and the whole performance of the chuck, a cover plate 13 used for sealing the top of the cavity 11 is arranged above the cavity 11, the cover plate 13 is fixedly connected with a protective edge 12 through bolts, and a plurality of bolt holes 10 are formed in the top surface of the protective edge 12. The combination of the cover plate and the protection edge improves the tightness of the cavity, provides relatively independent working space for internal components, and further protects the internal components from external interference. Meanwhile, aiming at the meshing part of the worm wheel 1.2 and the worm 1.1 in the worm wheel and worm mechanism 1, a baffle plate which is in accordance with the meshing shape can be independently adopted to protect the meshing part, or a protective cover is arranged outside the baffle plate to protect the whole worm 1.1.

In order to lubricate the matching between the inner components of the chuck, three oil injection holes 14 are arranged on the cover plate 13, and the oil injection holes 14 correspond to the meshing part of the inner ring of the worm wheel 1.2 and the gear 9.2.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a three-jaw chuck, includes base (4), and base (4) upper surface center is provided with columniform chuck body (6), and three radial draw-in grooves (3) have been seted up to chuck body (6) upper surface, are provided with jack catch (2), its characterized in that in draw-in groove (3): the transmission cavity (7) is formed in the chuck body (6) corresponding to the lower portions of the three clamping grooves (3), the bottom of each clamping groove (3) is provided with a radial opening (5) communicated with the transmission cavity (7), the bottom of each clamping jaw (2) is provided with a protrusion (8) penetrating through the corresponding opening (5) downwards, a transmission mechanism (9) used for driving the clamping jaws (2) to move radially is arranged in each transmission cavity (7), each transmission mechanism (9) comprises a gear (9.2) and a connecting rod (9.1), one end of each connecting rod (9.1) is hinged to the edge of the surface of the gear (9.2), the other end of each connecting rod is hinged to the corresponding protrusion (8), the gears (9.2) in the three transmission mechanisms (9) are driven by the same worm gear mechanism (1), and inner rings of worm gears (1.2) in the worm gear mechanisms (1) are provided with inner ring gear structures matched with.

2. The three-jaw chuck according to claim 1, wherein: the inner diameter of a worm wheel (1.2) in the worm and gear mechanism (1) is larger than the outer diameter of the chuck body (6), namely, the meshing part of the inner ring of the worm wheel (1.2) and the gear (9.2) is positioned outside the transmission cavity (7).

3. The three-jaw chuck according to claim 1, wherein: an annular protective edge (12) is arranged on the edge of the upper surface of the base (4), an annular cavity (11) is formed between the protective edge (12) and the chuck body (6), and the worm wheel (1.2) is arranged in the cavity (11).

4. The three-jaw chuck according to claim 2, wherein: a cover plate (13) used for sealing the top of the cavity (11) is arranged above the cavity (11), the cover plate (13) is fixedly connected with the protective edge (12) through bolts, and a plurality of bolt holes (10) are formed in the top surface of the protective edge (12).

5. The three-jaw chuck according to claim 4, wherein: three oil filling holes (14) are formed in the cover plate (13), and the oil filling holes (14) correspond to the meshing part of the inner ring of the worm wheel (1.2) and the gear (9.2).