CN213916183U

CN213916183U - Expansion tool

Info

Publication number: CN213916183U
Application number: CN202022981993.9U
Authority: CN
Inventors: ***; 钟俊锋
Original assignee: Changzhou Wugun Bearing Co ltd
Current assignee: Changzhou Wugun Bearing Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-08-10
Anticipated expiration: 2030-12-10

Abstract

The utility model relates to a tight frock expands, dabber, chuck connecting seat, position sleeve, screw rod assembly including the tight piece of a plurality of removals bloated, coaxial setting to and screw rod assembly drive arrangement, the spacing groove has been seted up on position sleeve upper portion, dabber upper portion is the toper, has the conical surface, it is in to remove the tight piece setting of bloating just setting up on the conical surface the spacing inslot, remove the tight piece internal surface that expands with the laminating of conical surface, surface enclose into a face of cylinder and cover jointly and are equipped with a plurality of springs, screw rod assembly can reciprocate under the screw rod assembly drive arrangement effect, thereby drive remove the tight piece of bloating and follow the conical surface generating line is in translation from top to bottom in the spacing groove, this tight frock of bloating, the clamping is reliable, positioning accuracy is high, clamping stability is good, simple structure, and can not damage the work piece.

Description

Expansion tool

The technical field is as follows:

the utility model relates to a frock clamp technical field especially relates to a tight frock expands.

Background art:

the expansion device is a clamping tool which is frequently used in daily processing production, and plays a role in positioning and clamping a workpiece by expanding the inner diameter surface of the workpiece.

The existing expansion device is easy to cause the phenomenon of workpiece slipping if the expansion force is not enough; if the expansion force is too large, the workpiece is deformed and even damaged.

The utility model has the following contents:

to the above problem, the utility model provides a clamping is reliable, positioning accuracy is high, clamping stability is good, simple structure, and can not damage the tight frock of expanding of work piece.

The utility model discloses a realize through following technical scheme: the utility model provides a tight frock expands, includes dabber, chuck connecting seat, position sleeve, the screw rod subassembly of a plurality of removal tight pieces that expand, coaxial setting to and screw rod subassembly drive arrangement, the dabber lower part is to keeping away from and the perpendicular to dabber axis direction extends there is chuck seat location platform, chuck connecting seat cover is established on the chuck seat location platform, the position sleeve sets up on the chuck connecting seat and the cover is established outside the dabber.

In order to better limit the moving range of the movable expansion block, a limiting groove is formed in the upper portion of the locating sleeve, the upper portion of the mandrel is conical and is provided with a conical surface, and the movable expansion block is arranged on the conical surface and is arranged in the limiting groove.

In order to improve the clamping reliability on the premise of ensuring that a workpiece is not damaged, the inner surface of the movable expansion block is attached to the conical surface, the outer surface of the movable expansion block jointly encloses a cylindrical surface and is sleeved with a plurality of springs, the springs can hoop the movable expansion blocks and simultaneously fix the relative positions between the movable expansion blocks, the outer surface of the movable expansion block is used for contacting with an inner hole of the workpiece to be clamped, the mandrel is provided with a screw assembly hole along the axis in a penetrating manner, the screw assembly is arranged in the screw assembly hole, one end of the screw assembly is abutted against the movable expansion block, the screw assembly can move up and down under the action of the screw assembly driving device so as to drive the movable expansion block to move up and down in the limiting groove along the generatrix of the conical surface, and when the movable expansion block moves down, the diameter of the cylinder enclosed by the outer surface of the movable expansion, otherwise, the workpiece is reduced and loosened.

Further, the screw rod assembly comprises a screw rod and a nut connected to the top end of the screw rod, and the lower plane of the nut abuts against the upper plane of the movable expansion block.

In order to improve the clamping precision and stability of the tool, the outer diameter of the movable expansion block is slightly smaller than the inner diameter of the limiting groove in a free state.

In order to further improve the clamping stability of the tool, the clamping fixture further comprises a pressing plate, the lower end of the positioning sleeve extends to the direction far away from and perpendicular to the axis of the positioning sleeve to form a pressing plate positioning table, the pressing plate is sleeved on the pressing plate positioning table, the lower plane is attached to the upper plane of the chuck connecting seat, and the degree of freedom of the positioning sleeve in the axis direction can be limited.

In order to improve the clamping stability and achieve the best expansion clamping effect, the movable expansion blocks are preferably three in number, the springs are preferably two in number, and the springs are preferably distributed along the outer surface buses of the movable expansion blocks at equal intervals.

Preferably, the screw assembly driving device is a rotary stretching cylinder, and other screw assembly driving devices can be selected according to actual conditions.

The utility model has the advantages that: according to the expansion tool, the mandrel with the conical surface is designed to be matched with the movable expansion block for use, so that the function of expanding and clamping a workpiece is conveniently realized; by designing the movable tensioning block with the cambered surface on the outer surface, the tool and the inner hole of the workpiece are completely attached in the bus direction, the tensioning force is completely acted on the inner diameter of the workpiece, the workpiece cannot be deformed, the clamped workpiece is well protected, and the workpiece is prevented from being gouged and broken; by designing the positioning block with the limiting groove and the positioning block pressing plate, the clamping precision and stability of the expansion tool are improved; in addition, the expansion tool is simple in structure and convenient to use.

Description of the drawings:

fig. 1 is a schematic perspective view of the expansion tool of the present invention;

fig. 2 is the utility model discloses a section view of bloated tight frock.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be clearly and clearly defined.

As shown in fig. 1 and fig. 2, the expansion tool comprises three movable expansion blocks 1, a mandrel 2 coaxially disposed, a chuck connecting seat 3, a positioning sleeve 4, a screw assembly 5, a pressing plate 8 and a screw assembly driving device 6, wherein a chuck seat positioning table 21 extends from the lower portion of the mandrel 2 in a direction away from and perpendicular to the axis of the mandrel 2, the chuck connecting seat 3 is sleeved on the chuck seat positioning table 21, the positioning sleeve 4 is disposed on the chuck connecting seat 3 and sleeved outside the mandrel 2, a pressing plate positioning table 42 extends from the lower end of the positioning sleeve 4 in a direction away from and perpendicular to the axis of the positioning sleeve 4, the pressing plate 8 is sleeved on the pressing plate positioning table 42, the lower plane is attached to the upper plane of the chuck connecting seat 3 and can limit the degree of freedom of the positioning sleeve 4 in the axis direction, a limit groove 41 is formed in the upper portion of the positioning sleeve 4, the upper part of the mandrel 2 is conical and is provided with a conical surface 22, the movable expansion block 1 is arranged on the conical surface 22 and is arranged in the limiting groove 41, the inner surface of the movable expansion block 1 is attached to the conical surface 22, the outer surfaces of the three movable expansion blocks 1 jointly enclose a cylindrical surface and are sleeved with 2 springs 7 which are distributed at equal intervals, the outer diameter of the movable expansion block 1 is slightly smaller than the inner diameter of the limiting groove 41 in a free state, the mandrel 2 is provided with a screw component hole 23 along the axis, the screw assembly 5 is arranged in the screw assembly hole 23, the screw assembly 5 comprises a screw 51 and a nut 52 connected to the top end of the screw 51, the lower plane of the nut 52 is abutted against the upper plane of the movable tensioning block 1, the screw assembly 5 can move up and down under the action of the screw assembly driving device 6, thereby driving the movable expansion block 1 to move up and down in the limiting groove 41 along the generatrix of the conical surface 22.

In this embodiment, the screw assembly driving device 6 is a rotary stretching cylinder.

When the expansion tool is used for clamping a workpiece, the mandrel 2 is positioned on a spindle chuck and is fixed by the chuck connecting seat 3, the positioning sleeve 4 is connected on the chuck connecting seat 3 and is fixed by the pressing plate 8, when the expansion tool works, the screw assembly 5 drives the movable expansion block 1 to move downwards along the generatrix of the conical surface 22 of the mandrel 2 under the driving of the rotary stretching cylinder 6 at the bottom, and the diameter of a cylinder formed by the outer surfaces of the movable expansion block 1 is increased so as to expand the inner hole of the workpiece to complete the clamping of the workpiece; when a workpiece needs to be loosened, the rotary stretching cylinder 6 is loosened, the screw rod assembly 5 moves upwards, the expansion block 1 moves upwards along the generatrix of the conical surface 22 of the mandrel 2 under the action of the spring 7, and the diameter of a cylinder formed by the outer surfaces of the expansion block 1 is reduced, so that the purpose of loosening the workpiece is achieved.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "side", "end", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "disposed," "provided," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a tight frock expands which characterized in that: the mandrel comprises a plurality of movable expansion blocks, a mandrel coaxially arranged, a chuck connecting seat, a positioning sleeve, a screw assembly and a screw assembly driving device, wherein the lower part of the mandrel is far away from and extends to the direction vertical to the axis of the mandrel, the chuck connecting seat is sleeved on the chuck seat positioning table, the positioning sleeve is arranged on the chuck connecting seat and sleeved outside the mandrel, the upper part of the positioning sleeve is provided with a limiting groove, the upper part of the mandrel is conical and provided with a conical surface, the movable expansion blocks are arranged on the conical surface and arranged in the limiting groove, the inner surface of each movable expansion block is attached to the conical surface, the outer surfaces jointly enclose a cylindrical surface and are sleeved with a plurality of springs, the mandrel is provided with a screw assembly hole along the axis in a penetrating way, the screw assembly is arranged in the screw assembly hole, and one end of the screw assembly is abutted against the movable expansion blocks, the screw assembly can move up and down under the action of the screw assembly driving device, so that the movable expansion block is driven to move up and down in the limiting groove along the conical surface bus.

2. The expansion tool of claim 1, wherein: the outer diameter of the movable expansion block is slightly smaller than the inner diameter of the limiting groove in a free state.

3. The expansion tool of claim 1, wherein: the clamping chuck is characterized by further comprising a pressing plate, the lower end of the positioning sleeve is far away from and perpendicular to the positioning sleeve, a pressing plate positioning table extends in the axis direction of the positioning sleeve, the pressing plate is sleeved on the pressing plate positioning table, the lower plane is attached to the upper plane of the chuck connecting seat, and the freedom degree of the positioning sleeve in the axis direction can be limited.

4. The expansion tool of claim 1, wherein: the screw rod assembly comprises a screw rod and a nut connected to the top end of the screw rod, and the lower plane of the nut abuts against the upper plane of the movable expansion block.

5. The expansion tool of claim 1, wherein: the number of the movable expansion blocks is three.

6. The expansion tool of claim 1, wherein: the spring quantity is two, follows the tight piece surface generating line equidistance that expands moves distributes.

7. The expansion tool of claim 1, wherein: the screw component driving device is a rotary stretching cylinder.