CN216632647U

CN216632647U - Expansion sleeve tensioning and centering mechanism

Info

Publication number: CN216632647U
Application number: CN202123359865.1U
Authority: CN
Inventors: 孙昌海; 冯伟成; 胡楠
Original assignee: Shanghai Just In Machinery Co ltd
Current assignee: Shanghai Just In Machinery Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-31
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses an expansion sleeve tensioning and centering mechanism which comprises a sleeve, wherein the outer diameter of the top end of the sleeve is sequentially decreased from top to bottom, a piston rod is connected in the sleeve in a sliding mode, a push-pull cylinder is connected to the bottom end of the piston rod, a piston disc is connected to the top end of the piston rod, an expansion sleeve is fixed on the piston disc, and the inner diameter of the expansion sleeve is sequentially increased from bottom to top and is sleeved with the outer wall of the sleeve in a sliding mode. The expansion sleeve tensioning and centering mechanism sleeves the inner diameter of a workpiece on the expansion sleeve, and the expansion sleeve is reduced in appearance due to the self elastic action; the piston disc and the cover plate are pulled to be pressed downwards through the piston rod, so that the expansion sleeve slides downwards on the inclined plane of the sleeve, the expansion sleeve is extruded outwards to cling to the inner wall of a workpiece, centering and clamping are completed, the workpiece can be machined subsequently, the mechanism can be suitable for being used under the condition that the inner diameter needs to be positioned and clamped, the positioning precision is high, and the use of the inner hole of the workpiece is not influenced by the size of the inner hole of the workpiece within a certain range.

Description

Expansion sleeve tensioning and centering mechanism

Technical Field

The utility model relates to the field of clamping mechanisms, in particular to an expansion sleeve tensioning and centering mechanism.

Background

The machine tool machining refers to a process of ensuring the relative motion relationship between a cutter and a clamp by means of a machine tool, and simultaneously machining a workpiece mounted on the clamp by means of the cutter (or other tools). However, this process is not necessarily cutting but may be pressing. Such as knurling or spinning on a lathe. The workpiece needs to be clamped during machining, and at present, a clamp which is convenient, fast and high in precision is lacked for clamping the circular workpiece.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides an expansion sleeve tensioning and centering mechanism, which solves the problems in the background art.

In order to achieve the purpose, the utility model is realized by the following technical scheme: the utility model provides a cover that rises and tightly centering mechanism, includes the sleeve, sleeve top external diameter from top to bottom steadilys decrease in proper order, and sliding connection has the piston rod in the sleeve, and the bottom of piston rod is connected with the push-and-pull jar, and the top of piston rod is connected with the piston dish, is fixed with the cover that rises on the piston dish, the internal diameter of the cover that should rise by supreme lower increase in proper order and with telescopic outer wall slip noose.

Further limited, the expansion sleeve tensioning and centering mechanism is characterized in that a mounting disc is fixed to the bottom end of the sleeve, and mounting holes are formed in the mounting disc at equal intervals.

Further limited, the tension centering mechanism for the expansion sleeve is characterized in that a limiting groove is formed in the edge of the upper surface of the piston disc in a surrounding mode, the top of the expansion sleeve is erected in the limiting groove, a cover plate is installed on the upper surface of the piston disc through screws, and the cover plate is pressed with the upper surface of the expansion sleeve.

Further, the tension centering mechanism for the expansion sleeve is limited, wherein a groove is formed in the outer surface of the expansion sleeve.

Further, the expansion sleeve tensioning and centering mechanism is characterized in that an anti-rotation pin is inserted into the sleeve, and the side wall of the anti-rotation pin is in contact with the side surface of the piston rod.

The utility model has the following beneficial effects: the expansion sleeve tensioning and centering mechanism sleeves the inner diameter of a workpiece on the expansion sleeve, and the expansion sleeve is reduced in appearance due to the self elastic action; the piston disc and the cover plate are pulled to be pressed downwards through the piston rod, so that the expansion sleeve slides downwards on the inclined plane of the sleeve, the expansion sleeve is extruded outwards to cling to the inner wall of a workpiece, centering clamping is completed, the workpiece can be machined subsequently, after machining is finished, the expansion sleeve is moved upwards through the piston rod to drive the expansion sleeve to ascend along the inclined plane of the sleeve, the reset outer diameter of the expansion sleeve at the moment is reduced, the workpiece can be taken out, the mechanism can be suitable for being used under the condition that the inner diameter needs to be positioned and clamped, positioning precision is high, and the size of the inner hole of the workpiece in a certain range does not influence the use of the mechanism.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a cross-sectional view of the present invention.

In the figure: 1. a sleeve; 2. a piston rod; 3. a piston disc; 4. a cover plate; 5. expanding sleeves; 6. an anti-rotation pin; 7. a push-pull cylinder; 8. and (7) mounting a disc.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides an expansion sleeve rises and tightly centers mechanism, includes sleeve 1, and sleeve 1 top external diameter from top to bottom descends in proper order, and sliding connection has piston rod 2 in sleeve 1, and the bottom of piston rod 2 is connected with push-and-pull jar 7, and the top of piston rod 2 is connected with piston disc 3, is fixed with expansion sleeve 5 on the piston disc 3, and the internal diameter of this expansion sleeve 5 is by supreme ascending in proper order down and with sleeve 1's outer wall slip cap knot.

The bottom mounting of sleeve 1 has mounting disc 8, and the equidistance is equipped with the mounting hole on the mounting disc 8, is used for conveniently installing sleeve 1 on the workstation through the mounting hole.

The edge of the upper surface of the piston disc 3 is provided with a limit groove in a surrounding mode, the top of the expansion sleeve 5 is erected in the limit groove, the upper surface of the piston disc 3 is provided with a cover plate 4 through a screw, the cover plate 4 is in press fit with the upper surface of the expansion sleeve 5, and the expansion sleeve 5 is convenient to install through the cooperation of the cover plate 4 and the piston disc 3.

The outer surface of the expansion sleeve 5 is provided with a groove, and when the expansion sleeve 5 is extruded, the groove can play a role in buffering, so that the expansion sleeve 5 is in closer direct contact with a workpiece.

An anti-rotation pin 6 is inserted into the sleeve 1, the side wall of the anti-rotation pin 6 is in contact with the side face of the piston rod 2, the piston rod 2 can be limited through the anti-rotation pin 6, the piston rod 2 is prevented from rotating, and the piston rod 2 can only move up and down.

The expansion sleeve tensioning and centering mechanism sleeves the inner diameter of a workpiece on the expansion sleeve 5, and the expansion sleeve 5 is reduced in appearance due to the self elastic action; pulling piston dish 3 and apron 4 through piston rod 2 and pushing down, thereby make the cover 5 that rises slide down on the inclined plane of sleeve 1, the cover 5 that rises is pasted tight work piece inner wall by outside extrusion, accomplish the centering and press from both sides tightly, can process the work piece afterwards, after the processing, it rises to drive the cover 5 that rises along sleeve 1's inclined plane through piston rod 2 shifts up, the cover 5 that rises resets external diameter at this moment diminishes, can take out the work piece, this mechanism can be applicable to and use under the condition that the internal diameter needs the location centre gripping, positioning accuracy is high, the size of work piece hole does not influence its use in certain extent.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an expansion sleeve rises and tightly centers mechanism, includes the sleeve, its characterized in that: the outer diameter of the top end of the sleeve is gradually decreased from top to bottom, a piston rod is connected in the sleeve in a sliding mode, the bottom end of the piston rod is connected with a push-pull cylinder, the top end of the piston rod is connected with a piston disc, an expansion sleeve is fixed on the piston disc, and the inner diameter of the expansion sleeve is gradually increased from bottom to top and is in sliding sleeve connection with the outer wall of the sleeve.

2. The expanding sleeve tensioning and centering mechanism as claimed in claim 1, wherein: the bottom end of the sleeve is fixedly provided with a mounting disc, and mounting holes are formed in the mounting disc at equal distances.

3. The expanding sleeve tensioning and centering mechanism as claimed in claim 2, wherein: the edge of the upper surface of the piston disc is provided with a limiting groove in a surrounding mode, the top of the expansion sleeve is erected in the limiting groove, the upper surface of the piston disc is provided with a cover plate through screws, and the cover plate is in press fit with the upper surface of the expansion sleeve.

4. The expanding sleeve tensioning and centering mechanism as claimed in claim 3, wherein: the outer surface of the expansion sleeve is provided with a groove.

5. The tension centering mechanism of the expanding sleeve as claimed in any one of claims 1 to 4, wherein: an anti-rotation pin is inserted into the sleeve, and the side wall of the anti-rotation pin is in contact with the side surface of the piston rod.