CN106270598A - Retaining mechanism for lathe chuck opening and closing device - Google Patents
Retaining mechanism for lathe chuck opening and closing device Download PDFInfo
- Publication number
- CN106270598A CN106270598A CN201610626324.5A CN201610626324A CN106270598A CN 106270598 A CN106270598 A CN 106270598A CN 201610626324 A CN201610626324 A CN 201610626324A CN 106270598 A CN106270598 A CN 106270598A
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- CN
- China
- Prior art keywords
- spring
- chuck
- retaining mechanism
- closing device
- tensioning means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
Abstract
The invention belongs to lathe field, a kind of retaining mechanism for lathe chuck opening and closing device of concrete offer.Present invention seek to address that the problem that existing lathe chuck card engaging workpiece efficiency is low, power consumption of polymer processing is high.For this purpose, the lathe chuck opening and closing device of the present invention includes spring tensioning means, hydraulic cylinder and retaining mechanism, one end of spring tensioning means is fixing with chuck to be connected, the other end can be axially driving by hydraulic cylinder, spring tensioning means includes the first spring, first spring can provide tightening force to chuck and therefore make chuck close up, hydraulic cylinder is for being pushed axially the described other end of spring tensioning means, to overcome the elastic force of the first spring and therefore making chuck open, locking device can lock chuck when hydraulic cylinder is pushed axially the described other end of spring tensioning means.The present invention can not only effectively reduce energy consumption during chuck clamping, and can significantly reduce the axial thrust that bearing bears, and improves its service life.
Description
Technical field
The invention belongs to lathe field, a kind of retaining mechanism for lathe chuck opening and closing device of concrete offer.
Background technology
As far back as the 1950's, occur in that the high-frequency motor spindle for grinding aperture, converter at that time are adopted
With radio tube, although rotating speed is high, but power is little, and torque is the least.Needs and power electronic device along with high-speed cutting development
Part, the development of computer technology of microelectronic component, create converter and the vector controlled driver of all solid state original paper；Add
The appearance of admixture ceramics bearing so that occur in that for milling, turning, machining center at late 1980s, the beginning of the nineties
Torque high-power, big, high-revolving electro spindle Deng processing.And these turning electric main shafts are usually directly connected to hands in application
Dynamic chuck or oild chuck are joined rotating cylinder and are used together, and the most not only change in processing that efficiency on part is low, Hydraulic Station works always,
It is very power consumption, and the easy leakage of oil of angling cylinder brings a certain degree of pollution to environment.
Correspondingly, this area needs a kind of new clamping chuck structure to solve the problems referred to above.
Summary of the invention
In order to solve the problems referred to above of the prior art, it is solution existing lathe hand chuck card engaging workpiece efficiency
Problem low, that oild chuck power consumption of polymer processing is high, the invention provides a kind of retaining mechanism for lathe chuck opening and closing device.Institute
State lathe chuck opening and closing device and include spring tensioning means, hydraulic cylinder and described retaining mechanism, the one of described spring tensioning means
Holding be connected fixing with described chuck, the other end of described spring tensioning means can be axially driving by described hydraulic cylinder, described bullet
Spring take-up device includes the first spring, and described first spring can provide tightening force to described chuck and therefore make described chuck
Movable jaw closes up, and described hydraulic cylinder is for being pushed axially the described other end of described spring tensioning means, in order to overcome institute
Stating the elastic force of the first spring and therefore make the movable jaw of described chuck open, described locking device can be on described hydraulic cylinder edge
Described chuck is locked when axially promoting the described other end of described spring tensioning means.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described lathe includes that electricity is main
Axle, described electro spindle includes housing and the rotary shaft being arranged in this housing, and described rotary shaft is fixing with described chuck to be connected；Institute
Stating positive button and left-hand thread body that retaining mechanism includes being disposed adjacent, described positive button is fixing with the cylinder body of described hydraulic jack to be connected
Connecing, described left-hand thread body is fixing with described rotary shaft to be connected, when described hydraulic cylinder is pushed axially the institute of described spring tensioning means
When stating the other end and therefore strut described chuck, described positive button engages with described left-hand thread body and therefore locks described rotary shaft.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described retaining mechanism also wraps
Including the second spring and spring capping, one end of described second spring is resisted against on described positive button, another of described second spring
End is resisted against on described spring capping, and described spring capping is fixing with the housing of described electro spindle to be connected.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described spring tensioning means
Also including pull bar, one end of described pull bar is fixing with described chuck to be connected, and the other end of described pull bar is adjacent to described hydraulic cylinder also
And can be pushed axially by the piston of described hydraulic cylinder.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described rotary shaft is arranged
Having through hole, described through hole runs through described rotary shaft, described pull bar and described first spring along the axis direction of described rotary shaft and sets
Put in described through hole, and the inwall of one end of described first spring and described through hole against.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described spring tensioning means
Also including the locking nut being arranged on described pull bar, described locking nut is threadably secured with described pull bar and is connected, described
One end of locking nut abuts with described first spring.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described spring tensioning means
Also including the fairlead being set on described pull bar, described fairlead is between described first spring and described locking nut.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described first spring is butterfly
Spring.
Above-mentioned in the preferred implementation of the retaining mechanism of lathe chuck opening and closing device, described second spring is ripple
Shape spring.
It will be appreciated to those of skill in the art that in the preferred technical solution of the present invention, in the rotary shaft of electro spindle
Being provided with through hole, be provided with pull bar and spring in through hole, one end of pull bar is fixing with chuck to be connected, the other end of pull bar and hydraulic pressure
The piston of oil cylinder against, one end of spring abuts with rotary shaft, and the other end of spring abuts with pull bar.Under normal conditions, by bullet
Chuck is strained by the elastic force of spring, makes claw close up.When chuck needs softened, hydraulic cylinder overcomes the active force promotion of spring to draw
Bar, makes claw open, and the positive button being now connected with hydraulic cylinder body and the left-hand thread body being connected to rotary shaft are engaged with each other, and is formed
Interaction force realizes self-locking.When chuck needs clamping, the piston of hydraulic cylinder is retracted, the elastic force of spring drive pull bar multiple
Position, therefore tension chuck also makes claw close up.On the one hand, owing to applying tightening force by spring to chuck under normal conditions, this
Bright device can be greatly lowered energy consumption during chuck clamping.On the other hand, during making claw open, the present invention's
Device can realize self-locking by ingenious setting of positive button Yu left-hand thread body, holds in the axial direction therefore, it is possible to effectively alleviate bearing
The thrust being subject to, improves its service life.
Accompanying drawing explanation
Fig. 1 is the structural scheme of mechanism for lathe chuck opening and closing device of the present invention.
Fig. 2 is the partial enlarged drawing of the retaining mechanism for lathe chuck opening and closing device of the present invention.
Detailed description of the invention
The preferred embodiment of the present invention is described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining the know-why of the present invention, it is not intended that limit the scope of the invention.Such as, although
In accompanying drawing, each component and position relationship thereof are drawn by a certain percentage, but this position relationship is non-unalterable, this area
It can be made adjustment by technical staff as required, in order to adapts to concrete application scenario.
It should be noted that in describing the invention, term " " center ", " on ", D score, "left", "right", " vertically ",
The direction of the instruction such as " level ", " interior ", " outward " or the term of position relationship are based on direction shown in the drawings or position relationship, this
It is intended merely to facilitate description rather than instruction or implies that described device or element must have specific orientation, with specifically
Azimuth configuration and operation, be therefore not considered as limiting the invention.Additionally, term " first ", " second ", " the 3rd " only use
In describing purpose, and it is not intended that indicate or hint relative importance.
In addition it is also necessary to explanation, in describing the invention, unless otherwise clearly defined and limited, term " peace
Dress ", should be interpreted broadly " being connected ", " connection ", for example, it may be fix connection, it is also possible to be to removably connect, or integratedly
Connect；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary,
It can be the connection of two element internals.To those skilled in the art, can understand that above-mentioned term exists as the case may be
Concrete meaning in the present invention.
As it is shown in figure 1, the retaining mechanism of the present invention is a part for lathe chuck opening and closing device.Lathe generally comprises:
Chuck 1, hydraulic cylinder 9 and for fixing, drive the electro spindle 3 of chuck 1, the upper end of electro spindle 3 with the lower end of chuck 1 fixing even
Connecing, the lower end of electro spindle 3 is connected with the upper end of hydraulic cylinder 9.Hydraulic cylinder 9 includes again: first hydraulic joint the 901, second hydraulic pressure connects
902, cylinder body 903, piston 904 and cylinder seat 905.Chuck 1 includes again chuck body 101, claw drive mechanism 102 and movable jaw
103.Orientation about Fig. 1, it should be pointed out that although show the lathe of the present invention in Fig. 1 on the whole according to vertical direction
Chuck opening-closing device and retaining mechanism, but this diagram is only used to conveniently describe, and this device is actual in actual applications
On be horizontally disposed.
With continued reference to Fig. 1, electro spindle 3 includes housing 301 and places rotary shaft 302 within it, the lower end of housing 301 with
Cylinder body 903 connects, and connects preferably by bolt, and hydraulic cylinder 9 slightly can float along the axis direction of rotary shaft 302.Rotation
The upper end of rotating shaft 302 is fixing with the lower end of chuck body 101 to be connected.Rotary shaft 302 be internally provided with a through hole, this through hole edge
The axis direction of rotary shaft 302 runs through and is provided with convex annular rank 3021 in rotary shaft 302, and this through hole.At this through hole
Inside be provided with again connecting rod 2, the upper end of connecting rod 2 is fixed by bolt 12 and claw drive mechanism 102 and is connected.Connecting rod 2 times
End is provided with screw thread, and the lower surface of connecting rod 2 can with piston 904 against.
It will be appreciated to those of skill in the art that the connected mode of rotary shaft 302 and chuck body 101 can be according to not similar shape
The electro spindle of formula selects, and such as, connects by the modes such as bolt, flat key axle, splined shaft are fixing.Those skilled in the art are also
It is understood that connecting rod 2 and claw drive mechanism 102 can also use other in addition to by the fixing connected mode of bolt
Fixing connected mode, such as by the fixing connected mode such as screw thread, pin.
With continued reference to Fig. 1, connecting rod 2 is provided with the first spring 4, fairlead 5 and locking nut 6.Preferably, the first spring
4 use butterfly spring.Locking nut 6 arranges threaded lower end with connecting rod 2 and threadeds.Fairlead 5 company of being enclosed within slidably
On bar 2, and it is positioned at above locking nut 6.First spring 4 is enclosed within connecting rod 2, and one end of the first spring 4 is resisted against guiding
On set 5, the other end of the first spring 4 is resisted against on convex annular rank 3021, and the internal diameter of the first spring 4 is more than the straight of connecting rod 2
Footpath, the external diameter of the first spring 4 is less than the through hole internal diameter of rotary shaft 302.Preferably, can be on the first spring 4 and convex annular rank
One pad is set between 3021.It will be appreciated to those of skill in the art that locking nut 6 can be used for adjusting the first spring 4,
To adjust the tightening force size that pull bar 2 is applied in claw drive mechanism 102.Those skilled in the art it is also understood that
It is that fairlead 5 can be integrally formed with locking nut 6.In assembled state, the first spring 4 is in compressive state,
Therefore by connecting rod 2 and bolt 12, tightening force is applied in claw drive mechanism 102, makes movable jaw 103 be in and close up shape
State.
It should be noted that the external profile diameter of locking nut 6 need to be less than the through hole internal diameter of rotary shaft 302；Outside fairlead 5
Footpath is slightly less than the through hole internal diameter of rotary shaft 302, and is provided with at least one cannelure on the excircle of fairlead 5, in order to subtract
Few fairlead 5 and the contact area of the through hole of rotary shaft 302, also be able to prevent fairlead 5 from stuck phenomenon occur simultaneously.Enter one
Step, is provided with lubricating oil, or arranges solid profit on the excircle of fairlead 5 between the through hole of fairlead 5 and rotary shaft 302
Lubrication prescription.
With continued reference to Fig. 1, the lathe chuck opening and closing device of the present invention also includes between electro spindle 3 and hydraulic cylinder 9
Retaining mechanism, this retaining mechanism includes again positive button 7, left-hand thread body the 8, second spring 10 and spring capping 11, the preferably second bullet
Spring 10 uses wavy spring.
As depicted in figs. 1 and 2, positive button 7 is fixing with cylinder seat 905 to be connected, and left-hand thread body 8 is fixing with rotary shaft 302 to be connected, just
Button 7 is positioned at the upside of left-hand thread body 8, and is provided with an annular that both can be made to fit on positive button 7 and left-hand thread body 8
Face.Spring capping 11 is fixing with the housing 301 of electro spindle 3 to be connected, and is additionally provided with a hole on spring capping 11, and this hole is used
In making cylinder seat 905 pass, it is connected with positive button 7.Second spring 10 is arranged between positive button 7 and spring capping 11, and has
There is certain pretightning force, be used for compressing positive button 7 so that it is depart from left-hand thread body 8.
It should be noted that positive button 7 and the connection of cylinder seat 905, connect preferably by bolt, or art technology
Personnel can use other connected modes, the most threaded, welding etc. as the case may be.Left-hand thread body 8 and rotary shaft 302
Connecting, preferably by threaded, or those skilled in the art can use other connected modes, example as the case may be
Such as interference fit, bolt connection, welding etc..Connection between the housing 301 of spring capping 11 and electro spindle 3, preferably by
Bolt connects, or those skilled in the art can use other connected modes, the most threaded, welding as the case may be
Deng.It will be appreciated to those of skill in the art that the hole on spring capping 11 also has certain guide effect and dustproof effect,
Preferably, kollag can be set on the excircle of the inwall in this hole or cylinder seat 905.
In sum, when chuck 1 needs to strut, the second hydraulic joint 902 connects hydraulic oil, and the first hydraulic joint 901 connects
Return line, under the effect of hydraulic oil, piston 904 promotes connecting rod 2 to move upward, and then connecting rod 2 promotes claw drive mechanism
102 make movable jaw 103 open, and chuck 1 is softened.Meanwhile, the first spring 4 compressed can apply one to pull bar 2
Counteracting force, and by pull bar 2, this counteracting force passed to piston 904, and then make hydraulic cylinder 9 (specifically cylinder body 903 He
Cylinder seat 905) by a downward active force, under the effect of this power positive button 7 together with hydraulic cylinder 9 (specifically with cylinder
Seat is 905 together) overcome the pressure of the second spring 11, move downward so that positive button 7 fits with the ring surface of left-hand thread body 8, enters
And locked rotary shaft 302 and chuck 1.
When chuck 1 needs clamping, the first hydraulic joint 901 connects hydraulic oil, and the second hydraulic joint 902 takes back oil pipe line,
Under the effect of hydraulic oil, piston 904 is return downwards cylinder body 903 and is resetted.During piston 904 retract cylinder 903, pull bar
2 and claw drive mechanism 102 move downward under the effect of the first spring 4, therefore make movable jaw 103 close up.Meanwhile, right-hand thread
Body 7 departs from left-hand thread body 8 under the effect of the second spring 10 due to the retroaction of hydraulic oil, and rotary shaft 302 and chuck 1 are solved
Lock.
It should be noted that owing to pull bar 2 can be driven when chuck 1 rotates to rotate together, can be under the through hole of rotary shaft 302
End arranges a jump ring, and this jump ring limits pull bar 2 by the position of restriction locking nut 6 bottom and moves to the position of bottom
Put, make not contact between pull bar 2 with piston 904.It will be appreciated to those of skill in the art that can also be in rotary shaft 302
Installing the pad that a centre is porose at lower surface, this pad is connected by left-hand thread body 8 is fixing with rotary shaft 302 so that pull bar 2
Can be through the interstitial hole of pad, locking nut 6 cannot pass through the interstitial hole of pad, with this realize chuck 1 rotate time, pull bar
2 do not contact with piston 904.Or the length of pull bar 2 can also reasonably be designed by those skilled in the art so that chuck
1 when not placing workpiece, pull bar 2 and piston 904 against, when workpiece placed by chuck 1, pull bar 2 does not contacts with piston 904, or draws
Bar 2 contacts with piston 904 in no instance.
Although it will be understood by those skilled in the art that above-mentioned detailed description of the invention is vertically to paint according in Fig. 1 and Fig. 2
System, the retaining mechanism for lathe chuck opening and closing device of layout are described, but this has no effect on it and is horizontally mounted and makes
Use effect.
So far, describe technical scheme already in connection with preferred implementation shown in the drawings, but, this area
Skill will readily appreciate that, protection scope of the present invention is expressly not limited to these detailed description of the invention.Without departing from this
On the premise of the principle of invention, correlation technique feature can be made change or the replacement of equivalent by those skilled in the art, these
Within technical scheme after changing or replacing it falls within protection scope of the present invention.
Claims (9)
1. the retaining mechanism for lathe chuck opening and closing device, it is characterised in that described lathe chuck opening and closing device includes
Spring tensioning means, hydraulic cylinder and described retaining mechanism, one end of described spring tensioning means is fixing with described chuck to be connected, institute
The other end stating spring tensioning means can be axially driving by described hydraulic cylinder,
Described spring tensioning means includes the first spring, and described first spring can provide tightening force to described chuck and therefore make
The movable jaw of described chuck closes up,
Described hydraulic cylinder is for being pushed axially the described other end of described spring tensioning means, in order to overcome described first spring
Elastic force and therefore make the movable jaw of described chuck open,
Described locking device can be locked when described hydraulic cylinder is pushed axially the described other end of described spring tensioning means
Described chuck.
Retaining mechanism for lathe chuck opening and closing device the most according to claim 1, it is characterised in that described lathe bag
Including electro spindle, described electro spindle includes housing and the rotary shaft being arranged in this housing, and described rotary shaft is fixed with described chuck
Connect；
Described retaining mechanism includes positive button and the left-hand thread body being disposed adjacent, and described positive button is solid with the cylinder body of described hydraulic jack
Fixed connection, described left-hand thread body is fixing with described rotary shaft to be connected, when described hydraulic cylinder is pushed axially described spring tensioning means
The described other end and when therefore strutting described chuck, described positive button engages with described left-hand thread body and therefore locks described rotation
Axle.
Retaining mechanism for lathe chuck opening and closing device the most according to claim 2, it is characterised in that described locking machine
Structure also includes that the second spring and spring capping, one end of described second spring are resisted against on described positive button, described second spring
The other end be resisted against on described spring capping, the housing of described spring capping and described electro spindle is fixing to be connected.
Retaining mechanism for lathe chuck opening and closing device the most according to claim 3, it is characterised in that described spring draws
Tight device also includes pull bar, and one end of described pull bar is fixing with described chuck to be connected, and the other end of described pull bar is adjacent to described liquid
Cylinder pressure and can being pushed axially by the piston of described hydraulic cylinder.
Retaining mechanism for lathe chuck opening and closing device the most according to claim 4, it is characterised in that described rotary shaft
On be provided with through hole, described through hole runs through described rotary shaft, described pull bar and described first along the axis direction of described rotary shaft
Spring is arranged in described through hole, and the inwall of one end of described first spring and described through hole against.
Retaining mechanism for lathe chuck opening and closing device the most according to claim 5, it is characterised in that described spring draws
Tight device also includes that the locking nut being arranged on described pull bar, described locking nut and described pull bar are threadably secured even
Connecing, one end of described locking nut abuts with described first spring.
Retaining mechanism for lathe chuck opening and closing device the most according to claim 6, it is characterised in that described spring draws
Tight device also includes the fairlead being set on described pull bar, and described fairlead is between described first spring and described locking nut
Between.
Retaining mechanism for lathe chuck opening and closing device the most according to any one of claim 1 to 7, its feature exists
In, described first spring is butterfly spring.
9., according to the retaining mechanism for lathe chuck opening and closing device according to any one of claim 3 to 7, its feature exists
In, described second spring is wavy spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626324.5A CN106270598A (en) | 2016-08-02 | 2016-08-02 | Retaining mechanism for lathe chuck opening and closing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626324.5A CN106270598A (en) | 2016-08-02 | 2016-08-02 | Retaining mechanism for lathe chuck opening and closing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106270598A true CN106270598A (en) | 2017-01-04 |
Family
ID=57664601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610626324.5A Pending CN106270598A (en) | 2016-08-02 | 2016-08-02 | Retaining mechanism for lathe chuck opening and closing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106270598A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1833802A (en) * | 2005-03-19 | 2006-09-20 | 罗姆股份有限公司 | Self-centering four-jaw chuck |
| US20080315535A1 (en) * | 2005-02-26 | 2008-12-25 | Ott-Jakob Gmbh & Co. Spanntechnk Kg | Clamping Device |
| CN101890517A (en) * | 2010-06-18 | 2010-11-24 | 广州市敏嘉制造技术有限公司 | Power device for automatic chuck of lathe |
| CN203509090U (en) * | 2013-09-13 | 2014-04-02 | 安徽汇中内燃机配件有限公司 | Clamping jaw clamp for machining inner circle of aluminum inclusive cylinder sleeve |
| EP2939773A1 (en) * | 2014-04-29 | 2015-11-04 | Narr Beteiligungs GmbH | Clamping device |
| CN105252031A (en) * | 2014-07-08 | 2016-01-20 | 罗姆股份有限公司 | Collet chuck and clamping means with quick change function |
| CN206009885U (en) * | 2016-08-02 | 2017-03-15 | 北京超同步伺服股份有限公司 | Retaining mechanism for lathe chuck opening and closing device |
-
2016
- 2016-08-02 CN CN201610626324.5A patent/CN106270598A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080315535A1 (en) * | 2005-02-26 | 2008-12-25 | Ott-Jakob Gmbh & Co. Spanntechnk Kg | Clamping Device |
| CN1833802A (en) * | 2005-03-19 | 2006-09-20 | 罗姆股份有限公司 | Self-centering four-jaw chuck |
| CN101890517A (en) * | 2010-06-18 | 2010-11-24 | 广州市敏嘉制造技术有限公司 | Power device for automatic chuck of lathe |
| CN203509090U (en) * | 2013-09-13 | 2014-04-02 | 安徽汇中内燃机配件有限公司 | Clamping jaw clamp for machining inner circle of aluminum inclusive cylinder sleeve |
| EP2939773A1 (en) * | 2014-04-29 | 2015-11-04 | Narr Beteiligungs GmbH | Clamping device |
| CN105252031A (en) * | 2014-07-08 | 2016-01-20 | 罗姆股份有限公司 | Collet chuck and clamping means with quick change function |
| CN206009885U (en) * | 2016-08-02 | 2017-03-15 | 北京超同步伺服股份有限公司 | Retaining mechanism for lathe chuck opening and closing device |
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Application publication date: 20170104 |