CN213616061U

CN213616061U - Clamping device and clamping machine table comprising same

Info

Publication number: CN213616061U
Application number: CN202022300722.2U
Authority: CN
Inventors: 陈泳霖
Original assignee: Yinyi Zhizao Co ltd
Current assignee: Yinyi Zhizao Co ltd
Priority date: 2019-10-18
Filing date: 2020-10-15
Publication date: 2021-07-06
Anticipated expiration: 2030-10-15
Also published as: TWI733220B; DE102020127075A1; JP7175950B2; TW202116481A; JP2021066009A

Abstract

The utility model provides a clamping device and a centre gripping board that contains clamping device, this centre gripping board contain clamping device, casing, dial piece, detector, bearing, push unit and drive unit, and clamping device contains first cover union piece, second cover union piece, three clamping unit, driving piece, apical centre, and each clamping unit contains clamping piece, pass piece, setting element and elastic component. The positioning piece can rotationally position the clamping block on the second sleeving piece, the clamping block is provided with a slotted hole, the pushing piece penetrates through the slotted hole and is arranged on the first sleeving piece, the three clamping blocks jointly define a clamping opening towards the axis line direction of the clamping device, when the driving unit enables the shifting piece to do circular motion, the clamping opening can be reduced or enlarged to clamp or release a workpiece, the elastic piece is inserted into the slotted hole of the clamping block, the degree that the clamping block tightly presses the workpiece towards the clamping opening is equivalent, the workpiece is prevented from being excessively pressed during clamping to cause the position deviation of the workpiece, and a clamping machine table comprising the clamping device has the effects of time saving and labor saving.

Description

Clamping device and clamping machine table comprising same

Technical Field

The utility model relates to a centre gripping board that contains clamping device indicates a centre gripping board for grinding work piece especially.

Background

Grinding machines are used for machining the outer surface of a workpiece, and the rotary machining of a long workpiece (such as a rod-shaped or tubular workpiece) generally uses a clamping device to sleeve the outer surface of the long workpiece, and uses a center of the clamping device to abut against two ends of the workpiece, and then the rotation of the clamping device drives the long workpiece to rotate for grinding. A conventional clamping device, such as fig. 1 of CN206393454U patent, includes a supporting ring, a first tightening screw, two second tightening screws, a key and a locking nut, wherein the supporting ring has three radially disposed screw holes, the first tightening screw is screwed to one of the screw holes and then screwed to the locking nut and the key in sequence, the locking nut prevents the key from loosening from the first tightening screw, the two second tightening screws are screwed to the other two screw holes, the supporting ring is sleeved on a workpiece during use, the clamping diameter is adjusted by rotating the first tightening screw and the two second tightening screws, after the workpiece is clamped, the key is tightly clamped in a key groove of the workpiece to transmit torque, and the two second tightening screws tightly press the workpiece.

However, the conventional clamping device must manually insert the workpiece, and manually rotate the first tightening screw and the second tightening screw when clamping or releasing the workpiece, so that the whole clamping process is time-consuming and labor-consuming. If the workpiece is to be inserted into the clamping device and the process of clamping the workpiece by the clamping device is automated to reduce labor, the workpiece must be inserted into the clamping device by the robot arm, and then the first tightening screw and the two second tightening screws are tightened to clamp the workpiece. However, if the tightening degrees of the first tightening screw and the second tightening screw are not equal to each other, or the roundness of the workpiece is insufficient, the first tightening screw and the second tightening screw may press the workpiece to different degrees, which may cause the position of the workpiece to shift, resulting in a processing failure or a defective product, or even damage to the clamping device or the workpiece. Furthermore, since the first tightening screw and the two second tightening screws extend toward the center of the supporting ring, the workpiece is not easily aligned in the process of penetrating the workpiece into the clamping device by the robot arm, so that the workpiece collides with the first tightening screw and the two second tightening screws, which may cause the workpiece to be failed to penetrate and even damage the clamping device or the workpiece.

Disclosure of Invention

The utility model discloses an one of them project lies in providing a clamping device and a centre gripping board that contains clamping device, has higher compatibility to the work piece of centre gripping, even the true circularity of work piece is not enough, clamping device still can correctly stably the centre gripping work piece.

The utility model discloses an wherein another project lies in providing a clamping device and centre gripping board that can be applicable to the grinding machine, can be with automatic mode centre gripping or release work piece.

In order to achieve the above object, the utility model adopts the following technical scheme:

a clamping device for clamping a workpiece, the clamping device comprising:

a first sleeve member;

the first sleeving piece can rotate relative to the second sleeving piece;

each clamping unit is provided with a clamping block, a pushing piece and an elastic piece, the clamping blocks jointly define a clamping opening towards the axis line direction of the clamping device, each clamping block can be eccentrically and rotatably arranged on the second sleeving piece, each clamping block can reduce or expand the clamping opening when eccentrically rotating, each clamping block is provided with a slotted hole, the slotted hole penetrates through the clamping block, the pushing piece penetrates through the slotted hole and is arranged on the first sleeving piece, the pushing piece can displace in the slotted hole and push the clamping block to eccentrically rotate, the elastic piece is arranged on the clamping block, and when each clamping block eccentrically rotates to reduce the clamping opening, each elastic piece can enable each clamping block to tightly press the workpiece towards the clamping opening to the same degree.

The clamping device, wherein: the elastic piece is a plate-shaped elastic piece which is arranged in the slotted hole of the clamping block, the pushing piece can abut against the plate-shaped elastic piece, and when the pushing piece displaces in the slotted hole, the plate-shaped elastic piece can buffer the pushing force of the pushing piece on the clamping block.

The clamping device, wherein: the elastic member is an extension spring or a torsion spring, one end of the elastic member is arranged on the second sleeving member, and the other end of the elastic member is arranged on the clamping block.

The clamping device, wherein: the second sleeving part comprises a fixing ring, a supporting ring and a cushion part, the fixing ring is detachably arranged on the supporting ring, the cushion part is detachably clamped between the fixing ring and the supporting ring, and the plurality of clamping blocks can be eccentrically and rotatably arranged on the fixing ring.

The clamping device, wherein: the clamping device is also provided with a top center, and the second sleeving part is sleeved on the top center.

The clamping device, wherein: the outer diameter surface of the second sleeving piece is also provided with at least one blocking surface, and the blocking surface is arranged on the outer diameter surface of the second sleeving piece.

The clamping device, wherein: the clamping device is also provided with a driving piece, the driving piece is fixed on the first sleeving piece, and the driving piece is used for stirring and rotating and driving the first sleeving piece to rotate together.

The clamping device, wherein: the driving member extends radially outward to form a driving portion, and the driving portion has a driving hole.

A clamping machine table capable of automatically clamping or releasing a workpiece comprises a clamping device, and is characterized by further comprising:

a housing having a turntable, the turntable being rotatable relative to the housing;

the rotating disc can drive the rotating member to do circular motion by taking a rotating shaft of the rotating disc as a center when rotating, and the rotating member can enable the first sleeving member of the clamping device to rotate by taking the rotating shaft of the rotating disc as the center when doing circular motion;

and the driving unit drives the turntable to rotate relative to the shell.

The centre gripping board, wherein: the device also comprises at least two detectors and a pushing unit, wherein the at least two detectors are arranged on the shell at intervals, each detector is arranged facing the clamping device, the pushing unit is provided with a power piece and a push rod, and the power piece can enable the push rod to push against the second sleeving piece.

Therefore, the utility model provides a clamping device can rely on and rotate first cover union piece and second cover union piece and drive the clamping block to clamping block eccentric rotation and centre gripping or loosen the work piece, the automation equipment operation of being convenient for is used, simultaneously, can rely on the cushioning effect of elastic component when the centre gripping work piece, with each clamping block centre gripping in the work piece, when the lower situation of true circularity appears in the work piece, the clamping block still can effectively centre gripping work piece, improve the tolerable tolerance that is suitable for the work piece in the lump when improve equipment degree of automation, have practical value.

Drawings

Fig. 1 is a perspective view of a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of the first embodiment of the present invention.

Figure 3 is an enlarged view of the clamping block and the resilient member of the first embodiment of the present invention.

Fig. 4 is a sectional view of a holding device according to a first embodiment of the present invention.

Fig. 5 is a schematic view (a) of the clamping process according to the first embodiment of the present invention.

Fig. 6 is a schematic view (two) of the clamping process according to the first embodiment of the present invention.

Fig. 7 is an exploded perspective view of a second embodiment of the present invention.

Fig. 8 is a schematic view (a) of a clamping process according to a second embodiment of the present invention.

Fig. 9 is a schematic view (ii) of the clamping process according to the second embodiment of the present invention.

Fig. 10 is an exploded perspective view of a third embodiment of the present invention.

Fig. 11 is a schematic view (a) of a clamping process according to a third embodiment of the present invention.

Fig. 12 is a schematic view (two) of the clamping process according to the third embodiment of the present invention.

Description of reference numerals: a holding device 10; a balance section 133; a first socket 11; a top core 14; a first shaft hole 111; a clamping block 15; a first end surface 112; a nip 151; a second end face 113; a slot 152; a perforation 114; an outer side 153; a second spigot 12; a groove 1521; a fixing ring 121; a pusher shoe 16; an end face 1211; a positioning member 17; a support ring 122; an elastic member 18; a socket section 1221; an elastic member 18 a; a stopper 1222; an elastic member 18 b; a first stop face 1223; a top surface 181; an inner annular face 1224; a housing 20; a first collar portion 1225; a turntable 21; a locking ring 123; a dial 30; a second stop surface 1231; a stem portion 301; a second collar portion 1232; a detector 40, 40'; a fastener 124; a bearing 50; a pad 125; a power member 60; a driver 13; a push rod 61; a carry-over portion 131; a workpiece 90; with the aperture 132.

Detailed Description

The utility model provides a clamping device and a centre gripping board that contains clamping device, clamping device are used for a centre gripping work piece, and the centre gripping board can automatic centre gripping or release this work piece, the utility model discloses a first embodiment is a centre gripping board that contains clamping device, please refer to fig. 1 to 4, and this embodiment contains clamping device 10, casing 20, dials commentaries on classics piece 30, detector 40, 40', bearing 50, pushes away to unit and drive unit (not drawing).

Referring to fig. 2 to 4, the clamping device 10 includes a first sleeving member 11, a second sleeving member 12, three clamping units, a driving member 13, and a top core 14. The first sleeving part 11 has a first axial hole 111, a first end surface 112, a second end surface 113 and a through hole 114, the first axial hole 111 axially penetrates the first sleeving part 11, the through hole 114 is located on the outer diameter surface of the first sleeving part 11, so that the cutting fluid remained in the clamping device during the grinding process can flow out from the through hole 114, the driving part 13 is fixed on the second end surface 113 of the first sleeving part 11 by means of a plurality of screw assemblies, the driving part 13 is annular, the driving part 13 has a driving part 131, a driving hole 132 and a balance part 133, the driving part 131 is opposite to the balance part 133, the driving part 131 and the balance part 133 radially extend away from the axial lead of the clamping device 10, the radial length of the driving part 131 is greater than that of the balance part 133, the driving hole 132 axially penetrates the driving part 131, the driving hole 132 is a U-shaped slot hole, the U-shaped opening of the driving hole 132 faces radially outwards, the second sleeving part 12 is sleeved on the, the second sleeve 12 comprises a fixing ring 121, a supporting ring 122, a locking ring 123, a fastening member 124 and a cushion member 125, the supporting ring 122 is located between the fixing ring 121 and the locking ring 123, the cushion member 125 is hollow cylindrical, the fastening member 124 penetrates through the fixing ring 121 and then further penetrates through the cushion member 125 and is screwed on the supporting ring 122, as shown in fig. 4, the cushion member 125 is sandwiched between the fixing ring 121 and the supporting ring 122, the supporting ring 122 of the second sleeve 12 has a socket section 1221 and a stop section 1222, three first stop surfaces 1223 are spaced on the outer diameter surface of the stop section 1222, the diameter of the first axial hole 111 of the first sleeve 11 is larger than the outer diameter of the fixing ring 121 and the outer diameter of the socket section 1221 of the supporting ring 122, so that the first sleeve 11 can be sleeved on the socket sections 1221 of the fixing ring 121 and the supporting ring 122 through the first axial hole 111, the locking ring 123 is detachably screwed on the supporting ring 122, and three second stop surfaces 1231 are spaced on the outer diameter surface of the locking ring 123, each first stop surface 1223 is located adjacent to each second stop surface 1231, and each first stop surface 1223 is located on the same plane as each second stop surface 1231, that is, the three first stop surfaces 1223 and the three second stop surfaces 1231 form three paired sets, each paired set has one first stop surface 1223 and one second stop surface 1231 located adjacent to each other and on the same plane, in addition, the inner ring surface 1224 of the support ring 122 further has a first collar portion 1225 radially protruding toward the axial center line of the clamping device 10, the locking ring 123 further has a second collar portion 1232 axially protruding toward the support ring 122, the outer diameter of the second collar portion 1232 is smaller than the diameter of the inner ring surface 1224 of the support ring 122, therefore, when the locking ring 123 is assembled and fixed on the support ring 122, the second collar portion 1232 can be inserted into the support ring 122 and press the bearing 50 toward the first collar portion 1225, so that the bearing 50 is located between the second sleeve 12 and the top end 14, and the bearing 50 allows the second spigot 12 to rotate relative to the top centre 14. Referring to fig. 2 and 5, each clamping unit includes a clamping block 15, a pushing element 16, a positioning element 17 and an elastic element 18, the three clamping blocks 15 together define a clamping opening 151 towards the axial line direction of the clamping device 10, the clamping opening 151 is a space between the axial line and the three clamping blocks 15 for clamping a workpiece, the positioning element 17 passes through the clamping blocks 15 and is screwed to the fixing ring 121 of the second sleeving element 12, so that the clamping blocks 15 can eccentrically rotate relative to the fixing ring 121 with the positioning element 17 as a fulcrum, it should be noted that the surfaces of the clamping blocks 15 facing to the clamping opening side have respective centroids, the position of the positioning element 17 passing through the fixing block 15 deviates from the centroid of the surface of the fixing block facing to the clamping opening side, when the fixing block 15 rotates around the positioning element 17, the surface of the fixing block facing to the clamping opening side eccentrically rotates, and when the eccentric rotation, the clamping opening 151 can be reduced or enlarged, so that the clamping opening 151 can clamp or release the, the clamping block 15 has a slot 152, the slot 152 axially penetrates the clamping block 15, the pushing element 16 passes through the slot 152 and is screwed to the first sleeving element 11, referring to fig. 3 and 5, the elastic element 18 is a plate-shaped elastic sheet, the elastic element 18 is located in the slot 152 of the clamping block 15, the hole wall of the slot 152 has two grooves 1521, two ends of the elastic element 18 are inserted into the grooves 1521, the elastic element 18 has a top surface 181 and a bottom surface opposite to each other, the top surface 181 can abut against the pushing element 16, a space for elastic deformation of the elastic element 18 is provided between the bottom surface of the elastic element 18 and the hole wall of the slot 152, therefore, when the pushing element 16 pushes against the top surface 181 of the elastic element 18, the elastic element 18 generates elastic deformation and is slightly recessed into the space between the bottom surface and the slot 152.

Referring to fig. 1 to 5, the housing 20 has a turntable 21, and the housing 20 has a driving unit (not shown) capable of driving the turntable 21 to rotate the turntable 21 relative to the housing 20. The dial 30 is inserted into the rotary plate 21, the dial 30 has a rod 301, and the rod 301 axially penetrates through the driving hole 132 of the driving member 13. The detectors 40 and 40 'are disposed at intervals in the housing 20, and the detectors 40 and 40' face the outer diameter surface of the driving member 13 to detect the driving portion 131 of the driving member 13. The pushing unit has a power member 60 and a push rod 61, an end surface of the push rod 61 faces the outer diameter surface of the second sleeving member 12, and the power member 60 can extend the push rod 61 and push against the first stopping surface 1223 of the supporting ring 122 and the second stopping surface 1231 of the locking ring 123.

Referring to fig. 4 to 6, in the clamping process of the clamping apparatus of the first embodiment of the present invention, firstly, a robot (not shown) is used to insert the workpiece 90 into the clamping opening 151 of the clamping device 10 and push the workpiece to contact the top center 14, the inner diameter of the fixing ring 121 of the second connecting member 12 is larger than the diameter of the workpiece 90, as shown in fig. 4, so as to prevent the workpiece 90 from colliding with the fixing ring 121 when inserted, at which time the three clamping blocks 15 are in a released state, as shown in fig. 5, and since the caliber of the clamping opening 151 is substantially equal to the inner diameter of the fixing ring 121 of the second connecting member 12, the workpiece 90 is easily aligned and does not collide with the clamping blocks 15 when inserted, then the driving unit (not shown) drives the turntable 21, so that the turntable 21 rotates in a second direction (e.g. clockwise direction) relative to the housing 20, while the top center 14 installed on the housing 20 remains non-rotating, the turntable 21 drives the dial 30 to make a circular motion in the second direction with, since the shifting member 30 is disposed through the driving hole 132 of the driving portion 131, the shifting member 30 can rotate the driving member 13 in the second direction during the circular motion, and the driving portion 131 and the balancing portion 133, which are opposite to each other, can make the center of gravity of the whole driving member 13 close to or just at the axis of the clamping device, so as to keep balance during the rotation, thereby avoiding the vibration caused by inertia, and since the driving member 13 is screwed to the first sleeving member 11, the driving member 13 drives the first sleeving member 11 to rotate in the second direction, and the first sleeving member 11 further drives the second sleeving member 12 to rotate in the second direction by virtue of the traction of the clamping block 15, when the detector 40 detects the driving portion 131, as shown in fig. 5, the rotating disc 21 stops rotating, so that the shifting member 30 and the clamping device 10 stop rotating, at this time, the first stopping surface 1223 of the supporting ring 122 and the second stopping surface 1231 of the locking ring 123 face the push rod 61, and then the power member 60 of the pushing unit is used to extend and push the push rod 61 to abut against the first stopping surface 1223 and the first stopping surface 1231, then the driving unit drives the rotating disc 21 to rotate in a first direction (e.g. counterclockwise), so that the rotating member 30 pushes the driving member 13 and the first sleeving member 11 to rotate in the first direction, because the first stopping surface 1223 and the second stopping surface 1231 are pushed by the push rod 61 and cannot rotate, the second sleeving member 12 cannot rotate, therefore, when the first sleeving member 11 rotates in the first direction relative to the second sleeving member 12, the first sleeving member 11 drives the pushing member 16 to displace in the slot 152 in the first direction, the displacement of the pushing member 16 further pushes the three clamping blocks 15 to eccentrically rotate counterclockwise in the first direction with the positioning member 17 as a fulcrum, the eccentric rotation of the three clamping blocks 15 can reduce the clamping opening 151 to clamp the workpiece 90 tightly, when the driving portion 131 is detected by the detector 40', as shown in fig. 6, the clamping device 10 completes the process of clamping the workpiece, the rotating disc 21 stops rotating, so that the rotating member 30 and the clamping device 10 stop rotating, the three clamping blocks 15 are stopped from eccentric rotation and maintained in a clamping state of forcibly clamping the workpiece 90. Then, the power member 60 of the pushing unit is used to retract the push rod 61 away from the first stopping surface 1223 and the second stopping surface 1231, and then the driving unit drives the rotating disc 21 to continue to rotate in the first direction, so that the rotating member 30 pushes the clamping device 10 to rotate in the first direction, and further the clamping device 10 drives the workpiece 90 to rotate, so as to perform the subsequent grinding operation.

It should be noted that the workpiece may have a problem of insufficient roundness during the manufacturing process, that is, the radius of the workpiece may be different in size, but the elastic member 18 of the clamping device 10 of the present invention enables the three clamping blocks 15 to press the workpiece 90 toward the clamping opening 151 to a similar extent, that is, the force of the three clamping blocks 15 pressing the workpiece 90 toward the clamping opening 151 tends to approach, so as to prevent one or more of the clamping blocks from touching the workpiece or touching the workpiece slightly due to insufficient roundness, further, the elastic member 18 can prevent the clamping blocks 15 from pressing the workpiece excessively due to the difference in height of the surface after the clamping is completed, so as to prevent the workpiece 90 from shifting due to the difference in pressing degree of the three clamping blocks 15 during the clamping process, even resulting in damage to the clamping device 10 or the workpiece 90, as described in detail below, in the clamping process, the first sleeving member 11 drives the pushing member 16 to move in the slot 152, the displacement of the pushing element 16 can push the clamping block 15 to eccentrically rotate, and in addition, the pushing element 16 also pushes against the top surface 181 of the elastic element 18 while moving in the slot 152, as the clamping block 15 gradually rotates to press against the workpiece 90, the resistance of the pushing element 16 to push the clamping block 15 to rotate is gradually increased, so that the pushing force pushing against the elastic element 18 when the pushing element 16 displaces is gradually increased, when the pushing force of pusher 16 against elastic member 18 is sufficient to deform elastic member 18, because a space for the elastic element 18 to elastically deform is provided between the bottom surface of the elastic element 18 and the hole wall of the slot 152, the displacement of the pushing element 16 can push the elastic element 18 to bend and deform toward the bottom surface, thereby buffering the pushing force generated by the displacement of the pushing element 16 to prevent the pushing element 16 from continuously pushing the clamping block 15, so that the clamping block 15 excessively presses the workpiece 90 to damage the clamping device or the workpiece. Even if one of the three clamping blocks 15 abuts against the surface portion with the larger radius on the workpiece, the elastic deformation of the elastic member 18 can buffer the thrust generated by the displacement of the pushing member 16, so as to prevent the clamping block 15 from rotating continuously and pressing the workpiece 90 excessively, and the other two clamping blocks 15 can still be pushed by the displacement of the pushing member 16 to rotate continuously and press the workpiece 90 tightly, therefore, when the procedure of clamping the workpiece is completed, the three clamping blocks 15 can effectively clamp and press the workpiece 90 towards the clamping opening 151, that is, the three clamping blocks 15 press the workpiece 90 towards the clamping opening 151 to a similar extent, so as to prevent the workpiece 90 from deviating due to different pressing degrees of the three clamping blocks 15 during clamping, and even cause the clamping device 10 or the workpiece 90 to be damaged.

After the polishing operation is completed, when the detector 40' detects the driving portion 131, the rotation of the turntable 21 is stopped, so that the rotation of the rotating member 30 and the clamping device 10 is stopped, the first stopping surface 1223 of the supporting ring 122 and the second stopping surface 1231 of the locking ring 123 face the pushing rod 61, the pushing rod 61 is extended and pushed against the first stopping surface 1223 and the second stopping surface 1231 by the power member 60 of the pushing unit, then the driving unit drives the turntable 21 to rotate in a second direction (e.g., clockwise direction), so that the rotating member 30 pushes the driving member 13 and the first sleeving member 11 to rotate in the second direction, since the first stopping surface 1223 and the second stopping surface 1231 are pushed by the pushing rod 61 to be unable to rotate, the second sleeving member 12 is unable to rotate, and therefore, when the first sleeving member 11 rotates in the second direction relative to the second sleeving member 12, the first sleeving member 11 drives the pushing member 16 to move in the second direction in the slot 152, the displacement of the pushing member 16 further pushes each of the three clamping blocks 15 to eccentrically rotate in the second direction with the positioning member 17 as a fulcrum, the eccentric rotation of the three clamping blocks 15 can expand the clamping opening 151 to release the workpiece 90, when the detector 40 detects the driving portion 131, the clamping device 10 completes the process of releasing the workpiece, the rotation of the rotary table 21 stops, the rotation of the toggle member 30, the driving member 13 and the first sleeving member 11 stops, and the eccentric rotation of the three clamping blocks 15 stops and is maintained in the release state.

The utility model discloses the clamping device 10 of centre gripping board of first embodiment can change the backing member 125 of different axial length according to the processing demand to change clamping device 10's axial length, please refer to fig. 2 and fig. 4, as long as with the spiro union in the back of the fastening piece 124 of support ring 122 unscrewing, the user can change backing member 125 from the perforation 114 of first cover union piece 11, screw fastening piece 124 again and the spiro union is accomplished in support ring 122 and is changed, need not disassemble whole clamping device 10. The utility model discloses in other embodiments, the utility model discloses a centre gripping board probably has the centre gripping group of various not unidimensional, and each centre gripping group respectively has driving piece, first set of union piece, clamping unit and solid fixed ring, when needing to be changed centre gripping group, as long as with the screw joint in the fastener of support ring dismantles the back, just can together take off fastener, pad spare, solid fixed ring, first set of union piece, driving piece and clamping unit to change not unidimensional centre gripping group.

In this embodiment, the push rod 61 can extend to push against the first stopping surface 1223 of the supporting ring 122 and the second stopping surface 1231 of the locking ring 123, in other possible embodiments of the present invention, the push rod 61 may extend to be close to but not directly push against the first stopping surface 1223 and the second stopping surface 1231, when the rotating member 30 pushes the driving member 13 and the first sleeve member 11 to rotate, as long as the extended push rod 61 can block the supporting ring 122 and the locking ring 123 from rotating, the second sleeve member 12 can still be prevented from rotating, which has the effect similar to the first embodiment of the present invention. In addition, the push rod 61 may only extend and push against one of the first stopping surface 1223 or the second stopping surface 1231, and the push rod 61 can still have the effect of stopping the rotation of the second sleeving member 12.

In this embodiment, the drive hole of driving piece is the U-shaped hole, and the U-shaped opening in drive hole is radial outwards to can conveniently take off driving piece from dialling the commentaries on classics piece when needing to change the part the utility model discloses in other possible embodiments, it probably is the O shape hole to drive the hole, as long as can conveniently take off driving piece from dialling the commentaries on classics piece, the utility model discloses not use this as the limit. In addition, in other possible embodiments of the present invention, the driving member may not have the driving portion and the balancing portion, and as long as the driving hole is provided for the dial-rotating member to penetrate, the dial-rotating member can still push the driving member to rotate, so that the present invention has the similar using effect as the above-mentioned embodiments.

In this embodiment, the dial piece is inserted in the turntable, and the dial piece has a rod portion, and the rod portion axially penetrates through the driving hole of the driving piece. The utility model discloses in other possible embodiments, dial the piece and probably set firmly in the driving piece, and drive the hole and change and set up in the carousel, make the pole portion of dialling the piece can wear to arrange the drive hole of carousel in, when the carousel rotated, the carousel still can drive to dial the piece and rotate, and had the result of use similar with above-mentioned embodiment.

In this embodiment, the number of clamping unit is three, in the utility model discloses in other possible embodiments, the clamping unit probably changes to other numbers, as long as can the centre gripping work piece, and can not make the work piece produce the skew in the centre gripping process, the utility model discloses not use this as the limit.

Referring to fig. 7 to 9, a clamping apparatus according to a second embodiment of the present invention is substantially the same as the first embodiment shown in fig. 1 to 6, so that the second embodiment of the present invention substantially adopts the reference numerals of the first embodiment of the present invention, but the elastic member 18a replaces the plate-shaped elastic piece with the extension spring, and the elastic force of the elastic member 18a is enough to pull the clamping block 15 to eccentrically rotate and tightly press against the workpiece 90. One end of the elastic element 18a is disposed on the end face 1211 of the fixing ring 121 of the second sleeving member 12, and the other end of the elastic element 18a is disposed on the outer side 153 of the clamping block 15. in the second embodiment of the present invention, the pushing element 16 is displaced in the slot 152 to push the clamping block 15 to eccentrically rotate to the position where the elastic element 18a can pull the clamping block 15, and then the pulling force of the elastic element 18a is utilized to further pull the clamping block 15 to eccentrically rotate toward the first direction to tightly press the workpiece 90, so as to clamp the workpiece 90 for further processing. Therefore, in the whole clamping process of the pusher 16 according to the second embodiment of the present invention, the clamping block 15 is forced against the workpiece 90 by the pulling force of the elastic member 18a, so as to avoid the situation that the workpiece 90 is unevenly stressed and deviates to cause damage to the clamping device or the workpiece due to the fact that some clamping blocks 15 do not contact or only slightly contact the workpiece 90. Therefore, when the process of clamping the workpiece is completed, the three clamping blocks 15 press the workpiece 90 toward the clamping opening 151 to a similar extent, so as to avoid the workpiece 90 from shifting due to the different degrees of pressing of the three clamping blocks 15 during clamping, and even to damage the clamping device 10 or the workpiece 90.

In this embodiment, one end of the elastic member 18a is disposed on the end surface 1211 of the fixing ring 121 of the second sleeving member 12, and the other end of the elastic member 18a is disposed on the outer side surface 153 of the clamping block 15. in other possible embodiments of the present invention, the other end of the elastic member 18a may be disposed on the outer diameter surface of the clamping block 15, as long as the clamping block 15 can be pulled to rotate eccentrically and reduce the clamping opening 151, the present invention is not limited thereto.

Referring to fig. 10 and 12, a clamping apparatus according to a third embodiment of the present invention is substantially the same as the second embodiment shown in fig. 7 to 8, but the elastic member 18b is a torsion spring instead of an extension spring to push the clamping block 15 to rotate eccentrically and press against the workpiece 90. One end of the elastic element 18b is disposed on the end face 1211 of the fixing ring 121 of the second sleeving member 12, the other end of the elastic element 18b is disposed on the outer side face 153 of the clamping block 15, and the spiral coil of the elastic element 18b is positioned on the positioning member 17. Because the third embodiment of the present invention is similar to the second embodiment in action principle, the difference is only that the second embodiment uses the extension spring to pull the clamping block 15 to rotate eccentrically and reduce the clamping opening, and the third embodiment uses the torsion spring to push the clamping block 15 to rotate eccentrically and reduce the clamping opening, so the action principle please refer to the second embodiment of the present invention, which is not repeated herein.

To sum up, the utility model provides a clamping device and one kind contain clamping device centre gripping board, but clamping device's three clamping block eccentric rotation is with pressing the centre gripping work piece, in addition, clamping device's elastic component enables that each clamping block centre gripping work piece's strength is roughly the same, make the clamping block can not excessively press the work piece tightly, avoid damaging clamping device or work piece, even the true circularity of work piece is not enough, clamping device's elastic component still enables the work piece and receives the degree of pressing fairly, produce the skew and lead to processing failure or produce the defective products in order to avoid the position of the in-process work piece at the centre gripping, damage clamping device or work piece even. In addition, when the three clamping blocks are in a release state, the calibers of the clamping openings defined by the three clamping blocks are larger than the diameter of the workpiece and are approximately equal to the inner diameter of the fixing ring of the second sleeving piece, so that the workpiece is easily aligned during penetrating and cannot collide with the clamping blocks, and the phenomenon that the workpiece penetrates and fails and even damages the clamping device or the workpiece can be avoided. Furthermore, according to different processing requirements, the clamping device can easily replace pad pieces with different length sizes through the through hole of the first sleeving piece or replace clamping groups with different sizes by means of disassembling the fastening piece. Therefore, the utility model discloses a centre gripping board can use manpower sparingly and time with the process automation of centre gripping or release work piece by a wide margin, reaches the practical benefit that promotes the operation efficiency.

Claims

1. A clamping device for clamping a workpiece, the clamping device comprising:

a first sleeve member;

the first sleeving piece can rotate relative to the second sleeving piece;

2. The clamping device of claim 1, wherein: the elastic piece is a plate-shaped elastic piece which is arranged in the slotted hole of the clamping block, the pushing piece can abut against the plate-shaped elastic piece, and when the pushing piece displaces in the slotted hole, the plate-shaped elastic piece can buffer the pushing force of the pushing piece on the clamping block.

3. The clamping device of claim 1, wherein: the elastic member is an extension spring or a torsion spring, one end of the elastic member is arranged on the second sleeving member, and the other end of the elastic member is arranged on the clamping block.

4. The clamping device of claim 1, wherein: the second sleeving part comprises a fixing ring, a supporting ring and a cushion part, the fixing ring is detachably arranged on the supporting ring, the cushion part is detachably clamped between the fixing ring and the supporting ring, and the plurality of clamping blocks can be eccentrically and rotatably arranged on the fixing ring.

5. The clamping device of claim 1, wherein: the clamping device is also provided with a top center, and the second sleeving part is sleeved on the top center.

6. The clamping device of claim 1, wherein: the outer diameter surface of the second sleeving piece is also provided with at least one blocking surface, and the blocking surface is arranged on the outer diameter surface of the second sleeving piece.

7. Clamping device according to any one of claims 1 to 6, characterized in that: the clamping device is also provided with a driving piece, the driving piece is fixed on the first sleeving piece, and the driving piece is used for stirring and rotating and driving the first sleeving piece to rotate together.

8. The clamping device of claim 7, wherein: the driving member extends radially outward to form a driving portion, and the driving portion has a driving hole.

9. A clamping apparatus for automatically clamping or releasing a workpiece, the clamping apparatus comprising the clamping device of any one of claims 1 to 8, the clamping apparatus further comprising:

and the driving unit drives the turntable to rotate relative to the shell.

10. The clamping machine table as claimed in claim 9, wherein: the device also comprises at least two detectors and a pushing unit, wherein the at least two detectors are arranged on the shell at intervals, each detector is arranged facing the clamping device, the pushing unit is provided with a power piece and a push rod, and the power piece can enable the push rod to push against the second sleeving piece.