Floating chuck

Abstract

The utility model discloses a floating chuck which comprises a chuck body and at least three rockers used for installing clamping jaws, the rockers are evenly distributed and arranged at intervals, main body parts of the rockers are located and installed in the chuck body through locating shafts, one ends of the rockers are clamping jaw installation ends used for installing the clamping jaws, and the other ends of the rockers are clamping jaw installation ends used for installing the clamping jaws. The chuck is characterized in that an elastic supporting mechanism is arranged between a main body part of each rocker and the chuck body, and the supporting direction of the elastic supporting mechanism is perpendicular to the central axis of the chuck body. The elastic supporting mechanism has the advantages that the structure is simple, the elastic supporting mechanism is stressed and compressed when clamping a workpiece, clamping force compensation is provided, stable clamping of the workpiece is ensured, and the rocker can be driven to reset quickly when the elastic supporting mechanism is loosened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chuck especially relates to a floating chuck. BACKGROUND

[0002] The floating chuck is a kind of chuck mainly used for processing long axle class parts, and has a certain compensation to the center of the part.The conventional structure floating chuck is mainly composed of chuck body, linkage mechanism, multiple rocker arms and jaw etc.parts, the main body of rocker arm is installed in the chuck body by positioning shaft, one end of rocker arm is set outside the chuck body for installing jaw, rocker arm can swing in and out around positioning shaft, multiple jaws are driven by linkage mechanism to realize inward folding to clamp workpiece or outward opening to release workpiece, when the surface roundness of clamped workpiece is not ideal or the clamping diameter is different from the rotation center, swing around positioning shaft by rocker arm can ensure the balance of clamping force and keep clamping stable.Currently, the common floating chuck on market often cannot achieve good clamping effect under the condition that the clamped workpiece surface is complex due to insufficient floating amount, which causes the machining precision of workpiece to be influenced to a certain extent;In addition, when machining is completed and returned to normal, the movement is often not smooth, the position of rocker arm cannot be guaranteed, and even after long time use or under the condition that the required floating amount of workpiece is large, rocker arm cannot be reset to default position. SUMMARY

[0003] The utility model provides a floating chuck that structure is simple, can effectively ensure clamping force to ensure machining precision and can be reset fast.

[0004] The utility model discloses a floating chuck that structure is simple, can effectively ensure clamping force to ensure machining precision and can be reset fast.

[0005] A kind of floating chuck, including chuck body and at least three rocker arms for installing jaw, multiple the rocker arms are evenly spaced, the main part of the rocker arm is positioned and installed in the chuck body by positioning shaft, one end of the rocker arm is the jaw mounting end for installing jaw, the jaw mounting end is set outside the chuck body, the chuck body is provided with linkage mechanism for driving the rocker arm synchronous action, the main part of the rocker arm and the chuck body are provided with elastic support mechanism, the support direction of the elastic support mechanism is perpendicular to the central axis of the chuck body.

[0006] The chuck body is provided with the guiding installation cavity for the inside and outside swing motion of the rocker arm on the mounting position of the rocker arm, the inside wall surface of the guiding installation cavity and the outside of the main part of the rocker arm are provided with the elastic support mechanism, the jaw mounting end is set outside the chuck body from the guiding installation cavity.

[0007] The elastic supporting mechanism comprises a supporting column elastically movably arranged on the main body of the rocker, and the inner end of the supporting column is supported by an elastic support. In the state of no force, the outer end of the supporting column is extended out of the main body of the rocker under the action of the elastic support and abuts against the inner side wall of the guiding installation cavity.

[0008] The main body of the rocker is provided with a guiding installation hole opened on the outer side and matched with the supporting column. The supporting column is movably arranged in the guiding installation hole, and the outer end of the supporting column is extended out of the main body of the rocker from the opening of the guiding installation hole. The elastic support is a spring arranged in the guiding installation hole and supported between the bottom end surface of the guiding installation hole and the inner end of the supporting column.

[0009] The outer end of the supporting column is a hemisphere.

[0010] The chuck body is provided with a screw hole penetrating in and out at the position corresponding to the guiding installation hole. An adjusting bolt is screwed and installed in the screw hole. The rod end of the adjusting bolt is extended into the guiding installation cavity, and the inner end of the supporting column abuts against the rod end of the adjusting bolt.

[0011] The linkage mechanism comprises a linkage column movably arranged in the chuck body. A linkage pull plate is coaxially arranged on the linkage column. An outer recess is recessed on the inner side end surface of the main body of the rocker. The linkage recess has an upper limiting surface and a linkage surface. The linkage surface is an inclined end surface inclined inward from top to bottom. The side of the linkage pull plate opposite to the linkage surface is provided with a driving surface inclined inward from top to bottom. The part of the linkage pull plate provided with the driving surface forms a driving part. The driving part is embedded in the corresponding linkage recess. The included angle between the upper limiting surface and the linkage surface is smaller than the included angle between the driving surface and the upper end surface of the linkage pull plate.

[0012] A fixed center is coaxially arranged on the linkage column, and the fixed center is extended out of the chuck body.

[0013] The chuck body is provided with a limiting frame at the position corresponding to the guiding installation cavity for limiting the rocker to only make inward and outward swing movement. The claw installation end is extended out of the chuck body through the opening of the limiting frame.

[0014] The opposite inner side end face and the outer side end face of the claw mounting end are respectively concavely provided with a limiting groove, the limiting groove separates the claw mounting end into an extending part and a limiting part, the extending part is extended and arranged outside the chuck body for mounting the claw, the inner side end face and the outer side end face of the limiting part are respectively convexly provided with a limiting block, the limiting block is limitedly arranged below the limiting frame, the lower inner end face of the limiting groove is a slanting end face, and the end face of the limiting frame opposite to the lower inner end face of the corresponding limiting groove is a matching and same direction inclined slanting end face.

[0015] Compared with the prior art, the utility model has the advantages of simple structure, the elastic supporting mechanism is arranged between the main body part of the rocker and the chuck body, the supporting direction of the elastic supporting mechanism is perpendicular to the central axis of the chuck body, the elastic supporting mechanism is compressed and provides clamping force compensation when clamping the workpiece, the stable clamping of the workpiece is ensured, and the rocker can be quickly reset when loosening. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0017] Figure 2 It is a sectional structure schematic view of the utility model under the unforced state;

[0018] Figure 3 It is Figure 2 It is an enlarged structure schematic view of A in the middle;

[0019] Figure 4 It is a three-dimensional structure schematic view of the rocker in the utility model. DETAILED DESCRIPTION

[0020] The utility model will be further described in detail in combination with the drawings.

[0021] As shown in the drawings, a floating chuck includes a chuck body 1 and at least three rockers 2 for mounting claws (not shown in the drawings), the plurality of rockers 2 are evenly and spacedly arranged, the main body part 201 of the rocker 2 is positioned and installed in the chuck body 1 through a positioning shaft 3, one end of the rocker 2 is a claw mounting end 202 for mounting the claw, the claw mounting end 202 is extended and arranged outside the chuck body 1, the chuck body 1 is provided with a linkage mechanism for driving the rocker 2 to synchronously act, the main body part 201 of the rocker 2 and the chuck body 1 are provided with an elastic supporting mechanism 3, and the supporting direction of the elastic supporting mechanism 3 is perpendicular to the central axis of the chuck body 1.

[0022] In this specific embodiment, in order to realize the stable installation and movable guiding of the rocker 2 in the chuck body 1, a guiding installation cavity 11 for the inside and outside swinging movement of the rocker 2 is arranged on the chuck body 1 at the installation position corresponding to the rocker 2, and the elastic supporting mechanism 3 is arranged between the inner side wall surface of the guiding installation cavity 11 and the outer side of the main body part 201 of the rocker 2, and the chuck jaw installation end 202 is arranged outside the chuck body 1.

[0023] In this specific embodiment, the elastic supporting mechanism 3 comprises a supporting column 31 which is arranged elastically and movably inside and outside the main body part 201 of the rocker 2, the inner end head of the supporting column 31 is supported by the elastic supporting part 32, and in the non-stressed state, the outer end head of the supporting column 31 is arranged outside the main body part 201 of the rocker 2 under the action of the elastic supporting part 32 and abuts against the inner side wall surface of the guiding installation cavity 11. The elastic supporting mechanism 3 has a simple structure, when the linkage mechanism drives the chuck jaw installation end 202 of the rocker 2 to be inwardly retracted, the elastic supporting part 32 is stressed to be in the compressed state, the elastic supporting mechanism 3 provides appropriate floating clamping force during the specific working process, and after the work is completed, the elastic supporting part 32 releases the rocker 2 to be quickly and automatically reset and released.

[0024] In this specific embodiment, the main body part 201 of the rocker 2 is provided with a guiding installation hole 21 which is open at the outer side and cooperates with the supporting column 31, the supporting column 31 is arranged elastically and movably inside and outside the guiding installation hole 21, and the outer end head of the supporting column 31 is arranged outside the main body part 201 of the rocker 2 from the opening of the guiding installation hole 21, and the elastic supporting part 32 is a spring which is arranged in the guiding installation hole 21 and supported between the bottom end surface of the guiding installation hole 21 and the inner end head of the supporting column 31. The structure is simple, and the installation and use are stable.

[0025] In this specific embodiment, the outer end head 311 of the supporting column 31 is a hemisphere. The rocker 2 can provide more flexible floating clamping force.

[0026] In this specific embodiment, the chuck body 1 is provided with a screw hole (not shown in the figure) which is internally and externally through at the position corresponding to the guiding installation hole 21, an adjusting bolt 4 is screw-connected and installed in the screw hole, the rod part end head of the adjusting bolt 4 is arranged in the guiding installation cavity 11, and the inner end head of the supporting column 31 abuts against the rod part end head of the adjusting bolt 4. The structure is simple, and it is convenient to appropriately adjust and regulate the elastic force of the elastic supporting part 32 according to different use conditions, so that the universality is better.

[0027] In this embodiment, the linkage mechanism comprises a linkage column 5 movably arranged in the chuck body 1, and a linkage pull plate 6 coaxially arranged on the linkage column 5. The inner side end surface of the main body part 201 of the rocker 2 is outwardly recessed to form a linkage recess 22, which has an upper limiting surface 221 and a linkage surface 222. The linkage surface 222 is an inclined end surface that is inclined inwardly from top to bottom. The side of the linkage pull plate 6 opposite to the linkage surface 222 is provided with a driving surface 61 that is inclined inwardly from top to bottom. The part of the linkage pull plate 6 provided with the driving surface 61 forms a driving part 601, which is embedded in the corresponding linkage recess 22. The included angle α between the upper limiting surface 221 and the linkage surface 222 is smaller than the included angle β between the driving surface 61 and the upper end surface of the linkage pull plate 6. The linkage mechanism has simple structure, convenient operation, and low manufacturing cost, and can stably realize the synchronous movement of multiple rockers 2. Meanwhile, through the cooperation of the linkage surface 222 and the driving surface 61 that are inclined and have different inclinations, the upward and downward movement of the linkage column 5 can drive the rocker 2 to swing around the positioning shaft 3.

[0028] In this embodiment, a fixed center 7 is coaxially arranged on the linkage column 5 and protrudes outside the chuck body 1. The fixed center 7 can provide the functions of centering and positioning for the workpiece, thereby ensuring the machining accuracy of the workpiece.

[0029] In this embodiment, a limiting frame 8 for limiting the rocker 2 to only swing inwardly and outwardly is arranged on the chuck body 1 at the position corresponding to the guide installation cavity 11, and the chuck jaw installation end 202 protrudes outside the chuck body 1 through the opening of the limiting frame 8. The limiting frame 8 is used to limit the movement direction of the rocker 2, and at the same time, the part of the guide installation cavity 11 is covered, so that the overall structure is beautiful.

[0030] In this embodiment, limiting recesses 23 are recessed on the opposite inner side end surface and outer side end surface of the chuck jaw installation end 202. The limiting recesses 23 divide the chuck jaw installation end 202 into a protruding part and a limiting part. The protruding part protrudes outside the chuck body 1 and is used for installing the chuck jaw. The inner side end surface and the outer side end surface of the limiting part are respectively provided with limiting protrusions 230. The limiting protrusions 230 are arranged below the limiting frame 8. The lower inner end surface 231 of the limiting recess 23 is an inclined end surface. The end surface of the limiting frame 8 opposite to the lower inner end surface 81 of the corresponding limiting recess 23 is an inclined end surface that is cooperated and inclined in the same direction. Through the cooperation of the limiting recess 23 and the limiting frame 8, the movement direction of the rocker 2 is limited, so that the rocker 2 can only swing around the shaft.

[0031] In this embodiment, the lower end of the linkage column 5 is coaxially provided with a connecting rod 51, which extends outside the chuck body 1. The connecting rod 51 is used to externally connect a corresponding driving device to drive the linkage column 5 to move up and down.

[0032] In this embodiment, the main body part 201 of the rocker 2 is provided with a rotating connection hole 24, the positioning shaft 3 is rotatably connected in and between the rotating connection hole 24, and the two ends of the positioning shaft 3 are fixedly installed in the chuck body 1. This realizes stable installation of the main body part 201 of the rocker 2 in the chuck body 1, and has simple structure and low cost.

[0033] In specific use, the workpiece is positioned by the fixed center 7, when the workpiece needs to be clamped, the connecting rod 51 is pulled downward to drive the linkage column 5, the linkage chuck 6 is synchronously pulled downward, the oblique driving surface 61 applies force to the oblique linkage surface 222 to drive the rocker 2 to rotate around the positioning shaft 3, and the elastic supporting mechanism 3 is compressed to provide a counterforce, the workpiece is clamped and simultaneously acts on the rocker 2, so that the chuck claw can stably clamp the workpiece. When the roundness of the surface of the workpiece is not ideal, the elastic supporting mechanism 3 provides a part of compensation, so that the clamping force is guaranteed, and the precision is greatly improved. When the chuck is returned to the initial position or the workpiece needs to be removed, the elastic restoring ability of the elastic supporting mechanism 3 can drive the rocker 2 to automatically rebound.

Claims

1. A floating chuck comprising a chuck body and at least three rocker levers for mounting chuck jaws, a plurality of said rocker levers being evenly spaced, a main body portion of said rocker levers being positioned and mounted in said chuck body by positioning shafts, one end of said rocker levers being a jaw mounting end for mounting chuck jaws, said jaw mounting end being extended and arranged outside said chuck body, a linkage mechanism for driving a plurality of said rocker levers to move synchronously being arranged in said chuck body, characterized in that The elastic supporting mechanism is arranged between the main body part of the rocker and the chuck body, and the supporting direction of the elastic supporting mechanism is perpendicular to the central axis of the chuck body.

2. A floating chuck as claimed in claim 1, characterized in that The chuck body is provided with a guide installation cavity for the inside-out swinging movement of the rocker at the installation position of the rocker.

3. A floating chuck as claimed in claim 2, characterized in that The elastic supporting mechanism comprises a supporting column which is elastically and movably arranged on the main body part of the rocker.

4. A floating chuck as claimed in claim 3, characterized in that The main body part of the rocker is provided with an outside-open guide installation hole matched with the supporting column.

5. A floating chuck as claimed in claim 3, wherein The outside of the supporting column is a hemisphere.

6. A floating chuck as claimed in claim 4, wherein The chuck body is provided with an inside-out through screw hole at the position matched with the guide installation hole.

7. A floating chuck as claimed in claim 1, wherein The linkage mechanism comprises a linkage column which is movably arranged in the chuck body.

8. A floating chuck as claimed in claim 7, characterized in that The chuck body is provided with a limiting frame for limiting the inside-out swinging movement of the rocker at the position matched with the guide installation cavity.

9. A floating chuck as claimed in claim 2, wherein The claw installation end is arranged outside the chuck body through the opening of the limiting frame.

10. A floating chuck as claimed in claim 9, characterized in that The opposite inner side end face and outer side end face of the claw mounting end are respectively recessed with a limiting recess, the limiting recess separates the claw mounting end into an extending part and a limiting part, the extending part extends outside the chuck body for mounting the claw, the inner side end face and outer side end face of the limiting part are respectively protruded with a limiting protrusion, the limiting protrusion is limited below the limiting frame, the lower inner end face of the limiting recess is a slanting end face, and the end face of the limiting frame opposite to the lower inner end face of the corresponding limiting recess is a matching and same direction slanting end face.

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