CN210966456U

CN210966456U - Shaft clamping mechanism based on two-stage driving

Info

Publication number: CN210966456U
Application number: CN201921726802.5U
Authority: CN
Inventors: 王斌; 齐铁城; 殷红秋; 杨建华; 杨力
Original assignee: CNNC Tianjin Technology Development Co Ltd
Current assignee: CNNC Tianjin Technology Development Co Ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-07-10
Anticipated expiration: 2029-10-15

Abstract

The utility model discloses an axle type fixture based on doublestage drive, axle type fixture includes and fixes the lower tight piece of clamp of the last tight piece of clamp on the bottom plate and utilize doublestage drive structure driven through the support, the bottom surface of going up tight piece of clamp forms the holding down face that compresses tightly axle type work piece, the top surface of the tight piece of clamp forms the support down the holding surface of axle type work piece, wherein: the double-stage driving structure comprises a first air cylinder fixed at the lower part of the bottom plate and a second air cylinder driven by the first air cylinder and provided with a guide, the bottom of a guide rod of the second air cylinder is fixed at the top of an air cylinder rod of the first air cylinder through a guide rod connecting plate, and the lower clamping block is fixed at the top of the second air cylinder. The utility model discloses can satisfy the centre gripping demand of the axle type work piece of different hardness for the clamping-force of output is greater than alignment pressure.

Description

Shaft clamping mechanism based on two-stage driving

Technical Field

The utility model relates to an axle type technical field especially relates to an axle type fixture based on doublestage drive.

Background

The straightness of a shaft workpiece is not easy to guarantee in the machining process, so that the radial run-out of the tail end is caused to be out of tolerance, a straightening bar straightening method is a common adjusting machining mode, when the straightening bar straightening method is used, a force application device applies straightening pressure on one end of the shaft workpiece in the radial direction, a clamping mechanism is used for clamping the shaft workpiece at the position where a lever feedback force is generated, most of the existing clamping mechanisms are driven by a single-stage air cylinder, when the material is soft, a one-stage driving structure can clamp the shaft workpiece, if the workpiece is deformed due to overlarge clamping force, the shaft workpiece with large hardness has large applied radial pressure, when the pressure is applied, the clamping mechanism can generate backspacing under the action of the lever, repeated straightening is needed, and the working efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an axle type fixture based on doublestage drive to the problem that the single-stage centre gripping dynamics that exists is little, work efficiency is low among the prior art.

Another object of the utility model is to provide an axle type fixture's centre gripping method, two-stage actuating mechanism can move step by step also in synchronization, satisfies the processing demand of different grade type axle type work piece.

For realizing the utility model discloses a technical scheme that the purpose adopted is:

the utility model provides a shaft class fixture based on double-stage drive, includes to fix through the support and presss from both sides tight piece and utilize double-stage drive structure driven lower clamp on the bottom plate, the bottom surface of going up to press from both sides tight piece forms the holding surface that pushes down that compresses tightly shaft class work piece, the top surface of pressing from both sides tight piece down forms the holding surface that supports shaft class work piece, wherein:

the double-stage driving structure comprises a first air cylinder fixed at the lower part of the bottom plate and a second air cylinder driven by the first air cylinder and provided with a guide, the bottom of a guide rod of the second air cylinder is fixed at the top of an air cylinder rod of the first air cylinder through a guide rod connecting plate, and the lower clamping block is fixed at the top of the second air cylinder.

In the technical scheme, the second cylinder with the guide function is a double-guide-rod cylinder.

In the technical scheme, the first air cylinder is fixed at the bottom of the lower seat plate, the lower seat plate is fixed on the bottom plate through the position adjusting assembly, a through hole for the air cylinder rod to penetrate through is formed in the lower seat plate, and a square hole is formed in the bottom plate to provide a moving space for the guide rod connecting plate.

In the above technical solution, the position adjusting assembly includes a plurality of selectable fixing hole sites formed on the bottom plate, the plurality of fixing hole sites are uniformly distributed along the axial direction of the shaft-like workpiece and symmetrically disposed on the left and right sides of the square hole, and the lower seat plate is fixed in the fixing hole sites through screws.

In the above technical scheme, a V-shaped groove is arranged on the symmetrical plane of the long side direction of the supporting surface, and the pressing surface is a plane.

In the above technical solution, a chamfer is formed on the outer side of the upper clamping block in the long side direction.

In the technical scheme, the lower clamping block is fixed at the top of the second cylinder through a connecting plate;

through holes are formed in two ends of the guide rod connecting plate and are respectively used for connecting two guide rods of the second air cylinder, threaded holes are formed in the end faces of the guide rods, fastening screws penetrate through the through holes and then enter the threaded holes, and the guide rod connecting plate is fixed on the end faces of the guide rods.

In the above technical solution, the bracket is an inverted L-shaped plate, the top surface of the upper clamping block is fixed on the lower bottom surface of the top horizontal plate of the L-shaped plate, and the bottom of the vertical plate of the L-shaped plate is fixed on the bottom plate.

In the above technical scheme, a right-angled triangle reinforcing rib is fixed between the vertical plate and the bottom plate.

The utility model discloses an on the other hand, the centre gripping method based on doublestage driven axle type fixture, including following step:

step 1, adjusting the positions of a shaft clamping mechanism and a straightening force application point through a position adjusting assembly to enable the distance between the force application point and the clamping position to be matched with the radial runout amount of a shaft workpiece;

step 2, one end of the shaft workpiece is placed on the supporting surface, so that the position with large runout of the shaft workpiece is positioned in the direction opposite to the straightening force;

and 3, selecting a driving mode to enable the clamping force to be larger than the straightening force:

for a shaft workpiece with higher hardness, a first air cylinder and a second air cylinder are started simultaneously, a lower clamping block is upwards applied under the simultaneous force application of a two-stage driving structure, and the upper clamping block is matched to clamp one end of the shaft workpiece;

and for the shaft workpiece with lower hardness, the second cylinder is started, the lower clamping block is upwards pressed under the force application of the second cylinder, and the upper clamping block is matched to clamp one end of the shaft workpiece.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the design of doublestage drive structure makes the utility model discloses both can be applicable to the axle type work piece of different hardness, to the less axle type work piece of hardness, launch single-stage power unit, to the great axle type work piece of hardness, launch doublestage power unit, the clamping-force of guaranteeing the output is greater than the aligning power, prevents that clamping part from returning, avoids straightening repeatedly, improves work efficiency.

2. The position of the clamping mechanism on the bottom plate can be adjusted by the aid of the position adjusting assembly, so that the distance between the clamping point and the force application point is adjusted, the clamping mechanism is suitable for shaft workpieces with different radial runout amounts, clamping can be conducted in a targeted mode, the clamping point is located on a reaction point of straightening force, and straightening efficiency is improved.

3. The device has wide application range, is suitable for optical axis workpieces, stepped shaft workpieces and shaft workpieces with other structures on the surfaces, and is also suitable for shaft workpieces made of materials with different hardness.

Drawings

Fig. 1 is a front view of a shaft clamping mechanism.

Fig. 2 is a sectional view of the shaft clamping mechanism.

Fig. 3 is a side view of a shaft clamping mechanism.

Fig. 4 is an isometric view of a shaft clamping mechanism.

In the figure: 1-bottom plate, 2-upper clamping block, 3-lower clamping block, 4-first cylinder, 5-guide rod connecting plate, 6-cylinder rod, 7-second cylinder, 8-guide rod, 9-shaft workpiece, 10-connecting plate, 11-lower seat plate, 14-bracket, 15-reinforcing rib, 19-through hole, 20-chamfer and 21-fixing hole site.

Detailed Description

The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

A shaft clamping mechanism based on double-stage driving comprises an upper clamping block 2 fixed on a bottom plate 1 through a support 14 and a lower clamping block 3 driven by a double-stage driving structure, wherein the bottom surface of the upper clamping block 2 forms a lower pressing surface for pressing a shaft workpiece 9, and the top surface of the lower clamping block 3 forms a supporting surface for supporting the shaft workpiece 9, wherein:

the double-stage driving structure comprises a first air cylinder 4 fixed at the lower part of the bottom plate 1 and a second air cylinder 7 driven by the first air cylinder 4 and provided with a guide, the bottom of a guide rod 8 of the second air cylinder 7 is fixed at the top of an air cylinder rod 6 of the first air cylinder 4 through a guide rod connecting plate 5, and the lower clamping block 3 is fixed at the top of the second air cylinder 7.

The supporting position of the shaft workpiece 9 (when straightening pressure is applied, the feedback force action point generated due to leverage is the supporting position) is placed on the supporting surface of the lower clamping block 3, for the shaft workpiece 9 with low hardness, the second cylinder 7 is started, the guide rod 8 extends out, the bottom of the second cylinder 7 faces upwards, and the lower clamping block 3 is driven until the top end of the shaft workpiece 9 abuts against the lower pressing surface.

For a shaft workpiece 9 with high hardness, the first cylinder 4 and the second cylinder 7 are started simultaneously, the cylinder rod 6 extends out, the guide rod connecting plate 5 faces upwards, the guide rod 8 extends out, the second cylinder 7 faces upwards, the lower clamping block 3 faces upwards under the action of force while in a double-stage driving structure, and the output force is larger. When the straightening force is large, the lower clamping block 3 can retreat under the action of a lever principle, the lifting force provided by the second air cylinder 7 is not enough to completely offset the straightening force, the bottom of the guide rod 8 of the second air cylinder 7 is fixed on the top of the air cylinder rod 6 of the first air cylinder 4 through the guide rod connecting plate 5, the thrust of the first air cylinder 4 acts on the guide rod 8, a larger stopping force is formed, the straightening effect is improved, and the straightening efficiency is improved.

Preferably, the second cylinder 7 with guide is a double-guide-rod cylinder, the double-guide-rod cylinder is a standard universal pneumatic element, and the double-guide-rod structure can prevent the cylinder body from rotating annularly when extending out, so that the unidirectional property of the feeding direction is ensured. Providing a clamping force on the shaft workpiece 9 in the radial direction. In addition to this, the second cylinder with guide 7 can be a normal single rod cylinder + axial guide mechanism.

Example 2

In this embodiment, the application range is further expanded on the basis of embodiment 1, and the first cylinder 4 is fixed to the base plate 1 through a position adjusting assembly, and is adaptable to shaft-like workpieces with different radial runout amounts.

Through the position control subassembly, the position of adjustable first cylinder 4 on bottom plate 1 to adjust the interval between fixture and the application of force mechanism, make the interval between application of force point and the feedback force action point adjustable, be applicable to the axle type work piece 9 of the not equidimension radial run-out volume, for example when the radial run-out is big, the interval between required application of force point and the feedback force action point is big, when the radial run-out is little, the interval between required application of force point and the feedback force action point is little. When the force application point is fixed, the distance between the force application point and the feedback force action point can be adjusted by adjusting the position of the clamping mechanism on the bottom plate 1.

Preferably, the first cylinder 4 is fixed at the bottom of the lower seat plate 11, the lower seat plate 1 is fixed on the base plate 1 through the position adjusting assembly, a through hole 19 for the cylinder rod 6 to pass through is formed on the lower seat plate 11, and a square hole is formed on the base plate 1 to provide a moving space for the guide rod connecting plate 5.

When the cylinder rod 6 returns, the guide rod connecting plate 5 enters the square hole, and when the position of the lower seat plate 11 is adjusted through the adjusting assembly, the guide rod connecting plate 5 moves left and right correspondingly at the position in the square hole.

Preferably, the position adjusting assembly includes a plurality of selectable fixing hole locations 21 formed on the bottom plate 1, the plurality of fixing hole locations 21 are uniformly distributed along the axial direction of the shaft-like workpiece 9 and symmetrically disposed on the left and right sides of the square hole, and the lower seat plate 11 is fixed in the fixing hole locations 21 by screws. The lower seat plate 11 is a bearing part of the first cylinder 4, and is provided with a threaded hole and a through hole for connecting the first cylinder 4 and the bottom plate 1.

Example 3

Preferably, a V-shaped groove is formed in a symmetrical plane of the support surface in the long side direction, and the pressing surface is a plane. When the clamping device is used, the shaft workpieces 9 are placed in the V-shaped groove, and the pressing surfaces of the plane structures of the upper clamping blocks 2 are combined to form three-point positioning, so that the clamping force is more stable.

Preferably, a chamfer 20 is formed on the outer side of the upper clamping block 2 in the longitudinal direction, the chamfer forms a space for taking and placing the shaft-like workpiece 9, and is more preferably a chamfer of 5 × 45 degrees.

Preferably, the lower clamping block 3 is fixed to the top of the second cylinder 7 by a connecting plate 10. The lower end face of the lower clamping block 3 is provided with a threaded hole and is fixed on the connecting plate 10 through a screw, and the connecting plate 10 is fixed on the top of the second cylinder 7 through a screw.

Preferably, through holes are formed in two ends of the guide rod connecting plate 5 and are respectively used for connecting two guide rods 8 of the second air cylinder 7, threaded holes are formed in the end surfaces of the guide rods 8, and fastening screws penetrate through the through holes and then enter the threaded holes to fix the guide rod connecting plate 5 on the end surfaces of the guide rods 8. The guide rod connecting plate 5 is a bearing part of the acting force of the first air cylinder 4.

Preferably, the support 14 is an inverted L-shaped plate, the top surface of the upper clamping block 2 is fixed to the lower bottom surface of the top horizontal plate of the L-shaped plate, the bottom of the vertical plate of the L-shaped plate is fixed to the bottom plate 1, and the inverted L-shaped plate provides support and positioning for the upper clamping block 2.

Preferably, a reinforcing rib 15 in the shape of a right triangle is fixed between the vertical plate and the bottom plate 1. Two right-angle sides of the reinforcing rib 15 are respectively fixed on the bottom plate 1 and the vertical plate through screws, so that a larger supporting force is provided for the support 14, and the vertical plate is prevented from deforming. Thereby providing greater support for the clamp locating feature.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an axle type fixture based on doublestage drive which characterized in that includes and fixes the last tight piece of clamp on the bottom plate through the support and utilize the tight piece of lower clamp of doublestage drive structure drive, the bottom surface of going up the tight piece of clamp forms the holding down surface that compresses tightly axle type work piece, the top surface of the tight piece of clamp forms the holding surface that supports axle type work piece down, wherein:

2. The dual drive based shaft clamping mechanism of claim 1 wherein the second cylinder with guide is a dual rod cylinder.

3. The shaft clamping mechanism based on two-stage driving as claimed in claim 1, wherein said first cylinder is fixed at the bottom of a lower seat plate, said lower seat plate is fixed on said bottom plate through a position adjusting assembly, said lower seat plate is formed with a through hole for said cylinder rod to pass through, said bottom plate is formed with a square hole for providing a moving space for said guide rod connecting plate.

4. The shaft clamping mechanism based on two-stage driving as claimed in claim 3, wherein said position adjusting assembly comprises a plurality of selectable fixing holes formed on said bottom plate, said plurality of fixing holes are uniformly distributed along the axial direction of said shaft workpiece and symmetrically disposed on the left and right sides of said square hole, and said bottom plate is fixed in said fixing holes by screws.

5. The shaft clamping mechanism based on double-stage driving as claimed in claim 1, wherein a V-shaped groove is arranged on a symmetrical plane in a long side direction of the supporting surface, and the pressing surface is a plane.

6. The shaft clamping mechanism based on two-stage driving as claimed in claim 1, wherein the upper clamping block is chamfered at the outer side in the longitudinal direction.

7. The dual-stage drive-based shaft clamping mechanism as recited in claim 1, wherein said lower clamping block is secured to a top portion of said second cylinder by a connecting plate;

8. The dual stage drive based shaft clamping mechanism of claim 1 wherein said support is an inverted L shaped plate.

9. The dual stage drive based shaft clamping mechanism of claim 8 wherein the top surface of said upper clamping block is fixed to the bottom surface of the top horizontal plate of said L shaped plate and the bottom of the vertical plate of said L shaped plate is fixed to said bottom plate.

10. The shaft clamping mechanism based on two-stage driving as claimed in claim 9, wherein a right triangle reinforcing rib is fixed between the vertical plate and the bottom plate.