CN218775085U

CN218775085U - Clamping mechanism

Info

Publication number: CN218775085U
Application number: CN202222796503.7U
Authority: CN
Inventors: 童庆坤; 骆溁; 王清江
Original assignee: Xiamen Tungsten Co Ltd
Current assignee: Xiamen Tungsten Co Ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-03-31
Anticipated expiration: 2032-10-24

Abstract

The clamping mechanism comprises a supporting unit, at least two abutting units and a buffer unit, wherein the at least two abutting units are distributed at intervals along the circumferential direction of the supporting unit, each abutting unit comprises an abutting block, one end of each abutting block is movably connected to the supporting unit along the radial direction of the supporting unit, and the other end of each abutting block can abut against a workpiece to be clamped; the buffer unit is in one-to-one correspondence with the abutting units and comprises two groups of magnetic elements which are respectively connected to the supporting unit and the abutting blocks, and repulsive force can be generated between the two groups of magnetic elements so that the abutting units have a movement trend of being far away from the supporting unit along the radial direction of the supporting unit. So set up, by the repulsion force that produces between two sets of magnetic element for the butt joint piece with wait to form the soft contact between the processing, avoid in the centre gripping process, treat to press from both sides the work piece and cause fish tail or extrusion damage.

Description

Clamping mechanism

Technical Field

The utility model relates to an anchor clamps technical field especially relates to a fixture.

Background

At the present stage, continuous paint dripping operation of workpieces to be clamped is mostly completed by an automatic production line, the workpieces to be clamped are conveyed to a station to be processed by a feeding mechanism, the workpieces to be clamped are fixed by a clamping mechanism, and then the paint dripping operation is performed.

The common clamping mechanism comprises a supporting unit, a telescopic unit and a butting unit, wherein the butting unit is used for contacting and butting with a workpiece to be clamped, the telescopic unit is connected with the butting unit and the supporting unit, and can drive the butting unit to be away from/close to the supporting unit to complete the grabbing action.

In the feeding process, the workpiece to be clamped is difficult to be coaxially placed relative to the clamping mechanism, so that when the clamping mechanism is used for grabbing and fixing the workpiece to be clamped, the stress on the peripheral side of the workpiece to be clamped is uneven. In addition, in a conventional clamping mechanism, the abutting unit of the clamping mechanism is in hard contact with a workpiece to be clamped, so that the surface of the workpiece to be clamped is often scratched or damaged by the abutting unit of the clamping mechanism.

Therefore, a clamping mechanism is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fixture is by the repulsion force that produces between two sets of magnetic element for the butt joint piece with treat and form the soft contact between the processing, can avoid in the centre gripping process, treat to press from both sides the work piece and cause fish tail or extrusion damage.

To achieve the purpose, the utility model adopts the following technical proposal:

a clamping mechanism comprising:

a support unit;

the support unit comprises at least two abutting units, the abutting units are distributed at intervals along the circumferential direction of the support unit and comprise abutting blocks, one ends of the abutting blocks are movably connected to the support unit along the radial direction of the support unit, and the other ends of the abutting blocks can abut against a workpiece to be clamped;

the buffer unit is in one-to-one correspondence with the abutting units and comprises two groups of magnetic elements which are respectively connected with the supporting unit and the abutting block, and repulsive force can be generated between the two groups of magnetic elements so that the abutting block has a movement trend of being far away from the supporting unit along the radial direction of the supporting unit.

As a preferable aspect of the clamping mechanism, the support unit is provided with a mounting hole, and the abutting unit is located in the mounting hole; alternatively, the abutting unit is located outside the supporting unit.

As a preferred technical solution of the clamping mechanism, the abutting unit further includes a base connected to the supporting unit, the base is provided with an accommodating groove, one end of the abutting block is slidably disposed in the accommodating groove, and the other end of the abutting block can extend out of the accommodating groove;

the bottom wall of the containing groove and the side surface of the abutting block facing the bottom wall of the groove are respectively provided with a group of magnetic elements.

As a preferable aspect of the clamping mechanism, a gap is provided between the abutting block and a circumferential side wall inside the accommodating groove.

As a preferable embodiment of the clamping mechanism, a first groove is formed in the bottom wall of the groove, a second groove is formed in the side surface of the abutting block facing the bottom wall of the groove, and a set of the magnetic elements is respectively fixed to the first groove and the second groove.

As a preferred technical solution of the clamping mechanism, a first limiting member is disposed at an open end of the accommodating groove, a second limiting member is disposed on the abutting block, the second limiting member is located between the first limiting member and the bottom wall of the groove, and the second limiting member can abut against the first limiting member along a radial direction of the supporting unit.

As a preferable aspect of the clamping mechanism, the clamping mechanism further includes a clamping driving unit, a fixed end of the clamping driving unit is mounted on the supporting unit, and a movable end of the clamping driving unit is connected to the base and drives the abutting unit to move along a radial direction of the supporting unit.

As a preferred technical solution of the clamping mechanism, two sets of the magnetic elements of each of the buffer units are both permanent magnets, or both electromagnets, or one set is an electromagnet and the other set is a permanent magnet.

As a preferred technical solution of the clamping mechanism, two sets of the magnetic elements of each of the buffer units are permanent magnets, a magnetizer is disposed between the abutting block and the magnetic element connected thereto, and/or a magnetizer is disposed between the base and the magnetic element connected thereto.

As a preferable technical solution of the above clamping mechanism, the magnetic element includes a plurality of pairs of the above permanent magnets, and the plurality of pairs of the above permanent magnets are arranged in a Halbach array.

The utility model discloses beneficial effect:

when the clamping mechanism is used for grabbing and fixing a workpiece to be clamped, if coaxiality deviation exists between the workpiece to be clamped and the clamping mechanism, the repulsive force generated between the two groups of magnetic elements enables the abutting block to be in soft contact with the workpiece to be machined, and scratching or extrusion damage to the workpiece to be clamped is avoided in the clamping process. And part of the butting units are closer to the workpiece to be clamped relative to other butting units, so that after the clamping action is finished, the interval between the butting blocks in the part of the butting units and the supporting units along the radial direction of the supporting units is smaller, and the repulsive force between the magnetic elements is larger, so that the workpiece to be clamped has the movement trend of coaxial alignment with the clamping mechanism, and the acting force of each butting unit on the workpiece to be clamped is balanced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a clamping mechanism provided in an embodiment of the present invention;

fig. 2 is a front view of a clamping mechanism provided by an embodiment of the present invention;

fig. 3 is a cross-sectional view of an abutment unit provided by an embodiment of the present invention;

fig. 4 is a sectional view of a clamping mechanism (peripheral abutment) provided by an embodiment of the present invention;

fig. 5 is a front view of a clamping mechanism provided by an embodiment of the present invention;

fig. 6 is a schematic diagram of a Halbach array arrangement of permanent magnets provided by an embodiment of the present invention;

fig. 7 is a sectional view of a clamping mechanism (inner peripheral abutment) according to an embodiment of the present invention.

In the figure:

1. a support unit;

2. an abutting unit; 21. a butting block; 211. a second groove; 212. a second limit piece; 22. a base; 221. a containing groove; 222. a first groove; 223. a first limit piece;

3. a buffer unit; 31. a magnetic element; 32. a magnetizer;

4. and clamping the driving unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

As shown in fig. 1 to 6, the present application provides a clamping mechanism, which includes a supporting unit 1, at least two abutting units 2 and a buffer unit 3, wherein the at least two abutting units 2 are distributed at intervals along a circumferential direction of the supporting unit 1, the abutting units 2 include abutting blocks 21, one end of each abutting block 21 is movably connected to the supporting unit 1 along a radial direction of the supporting unit 1, and the other end of each abutting block 21 can abut against a workpiece to be clamped; the buffer units 3 correspond to the abutting units 2 one by one, the buffer units 3 comprise two groups of magnetic elements 31 which are respectively connected to the supporting unit 1 and the abutting block 21, and repulsive force can be generated between the two groups of magnetic elements 31 so that the abutting block 21 has a movement tendency of being far away from the supporting unit 1 along the radial direction of the supporting unit 1.

So set up, be provided with corresponding buffer unit 3 for every butt unit 2 for make butt piece 21 have along the radial motion trend of support element 1 and keep away from support element 1, make the butt piece 21 and wait to form soft contact between the clamp work piece. When fixture treated a clamp work piece and snatched the fixed, butt piece 21 with treat a clamp work piece butt, butt piece 21 received the extrusion, and towards the direction removal that is close to supporting element 1, buffer unit 3 took place elastic deformation, holds the power, for replying elastic deformation, buffer unit 3 will continuously act on butt piece 21, makes butt piece 21 possess the trend of keeping away from supporting element 1, can be more firm with treat a clamp work piece butt.

Preferably, the buffer unit 3 comprises two sets of magnetic elements 31, and the two sets of magnetic elements 31 repel each other, so that the abutment block 21 has a tendency to move away from the support unit 1 along the radial direction of the support unit 1.

Optionally, the supporting unit 1 is provided with a mounting hole, and the abutting unit 2 is located in the mounting hole; so arranged, is used for clamping the workpiece to be clamped with the shaft diameter smaller than that of the supporting unit 1.

In other embodiments, as shown in fig. 7, the abutting unit 2 is located outside the supporting unit 1 and is used for fixing a workpiece to be clamped with a shaft diameter larger than that of the supporting unit 1.

Optionally, the abutting unit 2 further includes a base 22 connected to the supporting unit 1, the base 22 is provided with an accommodating groove 221, one end of the abutting block 21 is slidably disposed in the accommodating groove 221, and the other end can extend out of the accommodating groove 221; the bottom wall of the receiving groove 221 and the side surface of the abutting block 21 facing the bottom wall of the receiving groove are respectively provided with a set of magnetic elements 31. So designed, the magnetic element 31 is indirectly connected to the supporting unit 1 through the base 22.

Optionally, a gap is formed between the abutting block 21 and the circumferential side wall inside the accommodating groove 221. When the abutting block 21 contacts with a workpiece to be clamped, the abutting block can deflect at a certain angle relative to the radial direction of the supporting unit 1 so as to align the axis of the workpiece to be clamped, and the problem of poor clamping effect caused by coaxiality deviation is solved.

Optionally, the bottom wall of the accommodating groove is provided with a first groove 222, the side surface of the abutting block 21 facing the bottom wall of the accommodating groove is provided with a second groove 211, and the first groove 222 and the second groove 211 are respectively adhered and fixed with a set of magnetic elements 31. By such arrangement, the magnetic element 31 is immersed in the abutting block 21 and the base 22, so that the space occupied by the magnetic element 31 in the accommodating groove 221 is reduced, interference caused by movement or rotation of the abutting block 21 is avoided, and a large compression margin is ensured between the abutting block 21 and the base 22. And the sticking and fixing mode is used, the internal structure of the abutting unit 2 can be simplified, and the use of other fasteners is reduced.

Optionally, the open end of the receiving groove 221 is provided with a first limiting member 223, the abutting block 21 is provided with a second limiting member 212, and the second limiting member 212 is located between the first limiting member 223 and the bottom wall of the groove and can abut against the supporting unit 1 along the radial direction. The arrangement is such that the abutting block 21 is prevented from being disengaged from the receiving groove 221 along the radial direction of the supporting unit 1.

Optionally, the clamping device further comprises a clamping driving unit 4, a fixed end of the clamping driving unit is installed on the supporting unit 1, and a movable end of the clamping driving unit is connected to the base 22 and used for driving the abutting unit 2 to move along the radial direction of the supporting unit 1. So set up, press from both sides tight drive unit and drive butt unit 2 along the radial reciprocating motion of support element 1 to accomplish the action of snatching fixedly.

Further, fixture treats that press from both sides the work piece and snatchs when fixed, press from both sides tight drive unit 4 and radially expand along support element 1, drive butt unit 2 and keep away from support element 1 and be close to and treat and press from both sides the work piece, with treat the week side butt of pressing from both sides the work piece, at the preliminary back of waiting to press from both sides the all sides of work piece of butt piece 21, press from both sides tight drive unit 4 and further extend, make buffer unit 3 be in the energy storage state, and still possess certain compression space, so, buffer unit 3 is for resumeing elastic deformation, can provide the holding power for butt piece 21, in order to ensure butt piece 21 and the stable butt of treating to press from both sides work piece week side, and simultaneously, remaining compression space can provide the adjustment space for butt piece 21.

Optionally, the two groups of magnetic elements 31 of each buffer unit 3 are both permanent magnets, or both electromagnets, or one group is an electromagnet, and the other group is a permanent magnet. With the arrangement, the magnetic elements 31 have various combination modes, wherein when the magnetic elements 31 all adopt permanent magnets, the installation is convenient; in other embodiments, when an electromagnet is used, the magnitude of the repulsive force between the magnetic elements 31 can be adjusted with respect to the radial width of the workpiece to be held.

Optionally, the two groups of magnetic elements 31 of each buffer unit 3 are both permanent magnets, and a magnetizer 32 is disposed between the abutting block 21 and the magnetic element 31 connected thereto, and/or a magnetizer 32 is disposed between the base 22 and the magnetic element 31 connected thereto. The use of the magnetic conductive material can increase the magnetic conductance, reduce the demagnetizing field and improve the external magnetic field intensity and the service temperature of the magnet.

Optionally, the magnetic element 31 includes a plurality of pairs of permanent magnets, and the plurality of pairs of permanent magnets are arranged in a Halbach array (Halbach array). By adopting the arrangement mode, the Halbach magnet has the characteristic of magnetization direction, so that the working point of the permanent magnet is higher and generally exceeds 0.9, and the utilization rate of the permanent magnet is improved.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. Fixture, its characterized in that includes:

a support unit (1);

the clamping device comprises at least two abutting units (2), wherein the abutting units (2) are distributed at intervals along the circumferential direction of the supporting unit (1), the abutting units (2) comprise abutting blocks (21), one ends of the abutting blocks (21) are movably connected to the supporting unit (1) along the radial direction of the supporting unit (1), and the other ends of the abutting blocks can abut against a workpiece to be clamped;

buffer unit (3), buffer unit (3) with butt unit (2) one-to-one, buffer unit (3) including connect respectively in support unit (1) with two sets of magnetic element (31) of butt piece (21), two sets of can produce the repulsion between magnetic element (31), so that butt piece (21) have along the radial motion trend of keeping away from support unit (1) of support unit (1).

2. Clamping mechanism according to claim 1, wherein the support unit (1) is provided with a mounting hole in which the abutment unit (2) is located; or, the abutting unit (2) is positioned outside the supporting unit (1).

3. The clamping mechanism according to claim 1, wherein the abutting unit (2) further comprises a base (22) connected to the supporting unit (1), the base (22) is provided with a containing groove (221), one end of the abutting block (21) is slidably arranged in the containing groove (221), and the other end of the abutting block can extend out of the containing groove (221);

the side surfaces of the bottom wall of the accommodating groove (221) and the abutting block (21) facing the bottom wall of the groove are respectively provided with a group of magnetic elements (31).

4. Clamping mechanism according to claim 3, wherein the abutment block (21) is provided with a gap with a circumferential side wall inside the receiving groove (221).

5. The clamping mechanism according to claim 3, wherein a first groove (222) is formed in a bottom wall of the receiving groove (221), a second groove (211) is formed in a side surface of the abutting block (21) facing the bottom wall of the receiving groove, and a set of the magnetic elements (31) is respectively fixed in the first groove (222) and the second groove (211) in a sticking manner.

6. The clamping mechanism according to claim 3, wherein a first limiting member (223) is disposed at an open end of the receiving slot (221), a second limiting member (212) is disposed on the abutting block (21), the second limiting member (212) is located between the first limiting member (223) and the slot bottom wall, and the second limiting member (212) can abut against the first limiting member (223) along a radial direction of the supporting unit (1).

7. A clamping mechanism according to claim 3, further comprising a clamping driving unit (4), a fixed end of the clamping driving unit (4) being mounted to the supporting unit (1), a movable end of the clamping driving unit (4) being connected to the base (22) for driving the abutment unit (2) to move in a radial direction of the supporting unit (1).

8. Clamping mechanism according to claim 1, wherein both sets of magnetic elements (31) of each damping unit (3) are permanent magnets, or both sets of magnetic elements are electromagnets, or one set is an electromagnet and the other set is a permanent magnet.

9. Clamping mechanism according to claim 3, wherein both sets of magnetic elements (31) of each damping unit (3) are permanent magnets, a magnetic conductor (32) being arranged between the abutment block (21) and the magnetic element (31) connected thereto, and/or a magnetic conductor (32) being arranged between the base (22) and the magnetic element (31) connected thereto.

10. Clamping mechanism according to claim 8, wherein the magnetic element (31) comprises a plurality of pairs of said permanent magnets arranged in a Halbach array.