CN108436513A - A kind of clamp assembly of novel clamping workpiece - Google Patents
A kind of clamp assembly of novel clamping workpiece Download PDFInfo
- Publication number
- CN108436513A CN108436513A CN201810187249.6A CN201810187249A CN108436513A CN 108436513 A CN108436513 A CN 108436513A CN 201810187249 A CN201810187249 A CN 201810187249A CN 108436513 A CN108436513 A CN 108436513A
- Authority
- CN
- China
- Prior art keywords
- sliding
- cavity
- guide rod
- threaded rod
- clamp assembly
- 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
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
- Machine Tool Units (AREA)
Abstract
The invention discloses a kind of clamp assemblies of novel clamping workpiece, including machine table, annular mounting groove is equipped in the machine table top end surface, rotating disc is rotatably equipped with by rolling bearing in the annular mounting groove, the first cavity being symmetrical set and front and back symmetrically arranged second cavity are respectively arranged in the rotating disc, it is respectively equipped with the first clamping device and the second clamping device in first cavity and the second cavity, first clamping device includes connection the first sliding groove being set in the described two first cavity bottom walls in left and right and the first sliding shoe being slideably positioned at left and right sides of first sliding groove, it is installed with sliding motor at the first sliding groove inner hub location.
Description
Technical field
The present invention relates to a kind of clamp assemblies of novel clamping workpiece.
Background technology
With manufacturing continuous upgrading, some are answered in the industrial production for the fixed clamp assembly of round piece clamping
With and its extensively, tradition employed in clamp assembly be usually all to tighten fixation using bolt, operating process is extremely complex,
And fixed effect is poor, while in the processing of some special dimensions needing that clamping workpiece is carried out to circumferentially rotate operation, and it is traditional
In clamp assembly piece-holder fixation after be difficult to be circumferentially rotated, therefore, traditional clamp assembly application field is smaller,
There are larger defects.
Invention content
Deficiency in view of the above technology, the present invention propose a kind of clamp assembly of novel clamping workpiece.
A kind of clamp assembly of novel clamping workpiece of apparatus of the present invention, including machine table, the machine table top end surface
It is interior to be equipped with annular mounting groove, rotating disc, the rotating disc are rotatably equipped with by rolling bearing in the annular mounting groove
In be respectively arranged with the first cavity being symmetrical set and front and back symmetrically arranged second cavity, first cavity and
The first clamping device and the second clamping device are respectively equipped in two cavitys, first clamping device includes that connection is set to left and right
It the first sliding groove in described two first cavity bottom walls and is slideably positioned at left and right sides of first sliding groove
First sliding shoe, is installed with sliding motor at the first sliding groove inner hub location, spiral shell in first sliding shoe
Line cooperation is equipped with the first threaded rod, two first threaded rod inner ends respectively with power at left and right sides of the sliding motor
Connection, the two described one end of first threaded rod far from the sliding motor are rotatably set to first sliding groove respectively
In the inner wall of the left and right sides, it is installed with left linking arm and right linking arm, the left side respectively at the top of two first sliding shoes
Left guide rod extended to the right is fixed with below linking arm right end face, the right linking arm left end face top fixation is set
There is right guide rod extended to the left, driving device, institute are equipped in the machine table between two first cavitys in left and right
State driving device include the driver slot being set in the machine table and extending transversely symmetrical above and below and perforation be set to it is described
The through slot in groove bottom wall is driven, rotate gear, the right guide rod are rotatably provided with by rotation axis in the driver slot
Left side extending end is stretched into the through slot of upside and be slidably connected, on the right side of left guide rod extending end stretch on the downside of
It in the through slot and is slidably connected, the right guide rod and the left guide rod top end surface are equipped with and the rotate gear
The rack of setting is engaged, electric rotating machine, the rotation of the electric rotating machine are fixedly installed at mounting groove bottom wall central position
Axis is stretched into the mounting groove and is fixedly connected at top and the rotating disc bottom centre.
Further technical solution, second clamping device include being slideably positioned in former and later two described second cavitys
Advancing slip motion block and rear sliding shoe, screw-thread fit is equipped with the second spiral shell of the setting that extends back at the advancing slip motion block lower inside
Rasp bar, it is described after at sliding shoe inner upper screw-thread fit third threaded rod extended forward, second spiral shell are installed
Extending end is stretched into the driver slot of downside and is fixedly connected with the rotate gear front end face of downside on rear side of rasp bar,
On front side of the third threaded rod extending end stretch into the driver slot of upside and with the rotate gear rear side end of upside
Face is fixedly connected.
Further technical solution, two the first cavity roofs in left and right are respectively equipped with the first slide opening outside connection,
Sliding is provided with left sliding protrusion and right sliding protrusion, the left sliding protrusion top respectively in two first slide openings in left and right
It is fixed with left holding ring, the right sliding protrusion top is fixed with right holding ring.
Further technical solution, former and later two described second cavity roofs are respectively equipped with the second slide opening outside connection,
Sliding is provided with front slide protrusion respectively in former and later two described second slide openings and rear sliding is protruded, front slide protrusion top
It is fixed with fore-clamp held in ring, protrusion top is slided after described and is fixed with rear holding ring.
Further technical solution, the left holding ring, right holding ring, fore-clamp held in ring and rear holding ring inner side end are equal
It is fixed with friction plate.
Further technical solution, the left linking arm inner upper are equipped with the left wears groove passed through for the right guide rod,
The right linking arm lower inside is equipped with the right wears groove passed through for the left guide rod
The beneficial effects of the invention are as follows：
It is equipped with annular mounting groove in machine table top end surface, rotation is rotatably installed by rolling bearing in annular mounting groove
Disk is respectively arranged with the first cavity being symmetrical set and front and back symmetrically arranged second cavity, the first chamber in rotating disc
The first clamping device and the second clamping device are respectively equipped in body and the second cavity, the first clamping device includes that connection is set to a left side
The first sliding groove in right two the first cavity bottom walls and the first sliding shoe being slideably positioned at left and right sides of the first sliding groove,
Sliding motor is installed at first sliding groove inner hub location, screw-thread fit is equipped with the first screw thread in the first sliding shoe
Bar, two the first threaded rod inner ends are respectively be connected by power at left and right sides of sliding motor, and two the first threaded rods are far from sliding
One end of motor is rotatably set to respectively at left and right sides of the first sliding groove in inner wall, solid respectively at the top of two the first sliding shoes
Dingan County is equipped with left linking arm and right linking arm, and left guide rod extended to the right is fixed with below left linking arm right end face,
Right guide rod extended to the left, the machine table between two the first cavitys in left and right are fixed with above right linking arm left end face
Interior to be equipped with driving device, driving device includes the driver slot being set in machine table and extending transversely symmetrical above and below and perforation is set
The through slot being placed in driving groove bottom wall is rotatably provided with rotate gear in driver slot by rotation axis, on the left of right guide rod
Extending end is stretched into the through slot of upside and be slidably connected, on the right side of left guide rod extending end stretch on the downside of through slot in
And be slidably connected, right guide rod and left guide rod top end surface are equipped with the rack that setting is engaged with rotate gear, mounting groove bottom
Wall center position is fixedly installed electric rotating machine, and the rotary shaft of electric rotating machine stretches into mounting groove and top and rotation pan bottom
It is fixedly connected at center, to round piece, all around four direction grips to can be achieved at the same time, and can greatly simplify
Installation steps are clamped, after raising working efficiency can greatly increase clamping stability, while apparatus of the present invention can be to gripping
Round piece carries out automatic rotating operation, and practicability is high.
Description of the drawings
It, below will be to embodiment or the prior art in order to illustrate more clearly of inventive embodiments or technical solution in the prior art
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only one invented
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the clamp assembly of novel clamping workpiece of the present invention.
Fig. 2 is arrow direction structural schematic diagram in Fig. 1.
Fig. 3 is the overlooking structural schematic diagram of Fig. 1.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive spy
Other than sign and/or step, it can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
As shown in Figure 1 to Figure 3, the clamp assembly of a kind of novel clamping workpiece of apparatus of the present invention, including machine table 10, institute
It states and is equipped with annular mounting groove 11 in 10 top end surface of machine table, rotatably pacified by rolling bearing in the annular mounting groove 11
Equipped with rotating disc 12, be respectively arranged in the rotating disc 12 the first cavity 13 being symmetrical set and it is front and back be symmetrical arranged
The second cavity 40, be respectively equipped with the first clamping device and the second clamping device in first cavity, 13 and second cavity 40,
First clamping device includes the first sliding groove 32 that connection is set in described two first cavity, 13 bottom walls in left and right
And it is slideably positioned in the first sliding shoe 30 of first sliding groove, 32 left and right sides, 32 inside center of the first sliding groove
It is installed with sliding motor 29 at position, screw-thread fit is equipped with the first threaded rod 31 in first sliding shoe 30, two
First threaded rod, 31 inner end respectively with 29 left and right sides be connected by power of the sliding motor, two first threaded rods
31 one end far from the sliding motor 29 are rotatably set to respectively in first sliding groove, 32 left and right sides inner wall, and two
30 top of a first sliding shoe is installed with left linking arm 15 and right linking arm 16,15 right side of the left linking arm respectively
It is fixed with left guide rod 26 extended to the right below end face, is fixed with to the left above 16 left end face of right linking arm
Extended right guide rod 25 controls and is equipped with driving device, institute in the machine table 10 between two first cavitys 13
State driving device include the driver slot 21 being set in the machine table 10 and extending transversely symmetrical above and below and perforation be set to
Through slot 24 in 21 bottom wall of the driver slot is rotatably provided with turning gear in the driver slot 21 by rotation axis 221
Wheel 22,25 left side extending end of the right guide rod stretch into upside the through slot 24 in and be slidably connected, left guide rod 26
Right side extending end stretch into downside the through slot 24 in and be slidably connected, the right guide rod 25 and the left guide rod 26
Top end surface is equipped with the rack that setting is engaged with the rotate gear 22, fixes and sets at 11 bottom wall central position of the mounting groove
It is equipped with electric rotating machine 27, the rotary shaft 28 of the electric rotating machine 27 stretches into the mounting groove 11 and top and the rotating disc 12
It is fixedly connected at bottom centre.
Valuably or illustratively, wherein second clamping device include be slideably positioned in former and later two described second
Advancing slip motion block 42 in cavity 40 and rear sliding shoe 43, screw-thread fit is equipped at 42 lower inside of advancing slip motion block prolongs backward
Stretch the second threaded rod 223 of setting, it is described after at 43 inner upper of sliding shoe screw-thread fit be equipped with forward extended the
Three threaded rods 221, second threaded rod, 223 rear side extending end stretch into downside the driver slot 21 in and with the institute of downside
It states 22 front end face of rotate gear to be fixedly connected, 221 front side extending end of the third threaded rod stretches into the driving of upside
It is fixedly connected in slot 21 and with 22 back end surface of the rotate gear of upside.
Valuably or illustratively, wherein two 13 roofs of the first cavity in left and right are respectively equipped with the outside connection
One slide opening 14, sliding is provided with left sliding protrusion 17 respectively and right sliding protrudes 18, institute in two first slide openings 14 in left and right
It states left 17 top of sliding protrusion and is fixed with left holding ring 19, right 18 top of sliding protrusion is fixed with right holding ring 20,
To realize gripping on workpiece left and right directions.
Valuably or illustratively, wherein former and later two described second cavity, 40 roofs are respectively equipped with the outside connection
Two slide openings 41, sliding is provided with front slide protrusion 441 respectively in former and later two described second slide openings 41 and rear sliding protrudes 451,
441 top of front slide protrusion is fixed with fore-clamp held in ring 44, and 451 top of protrusion is slided after described and is fixed with rear holding ring
45, to realize gripping on workpiece front-rear direction.
Valuably or illustratively, wherein the left holding ring 19, right holding ring 20, fore-clamp held in ring 44 and rear clamping
45 inner side end of ring is fixed with friction plate 300, and so as to increase and be clamped the frictional force between workpiece, it is steady to improve clamping
It is qualitative.
Valuably or illustratively, wherein 15 inner upper of left linking arm is equipped with and is passed through for the right guide rod 25
Left wears groove 151,16 lower inside of right linking arm is equipped with the right wears groove 161. passed through for the left guide rod 26
When fixed, round piece is positioned over 10 top of machine table, then starts sliding motor 29, sliding motor 29 can after starting
The two 30 inside Slideslips of the first sliding shoe in left and right are driven simultaneously, and the at the same time described right guide rod 25 and the left guide rod 26 can divide
It does not drive corresponding rotate gear 22 to rotate, can pass through third threaded rod 221 respectively after upper and lower two rotate gears 22 rotation
43 advancing slip motion block of sliding shoe, 42 inside Slideslip after being driven with the second threaded rod 223, thus can realize a front and back left side for round piece
It is gripped while on right four direction, when needing to circumferentially rotate the round piece after fixation, control can be passed through
Electric rotating machine 27 rotate, the electric rotating machine 27 rotation rotating disc 12 can be driven to be rotated, thus can drive round piece into
Row rotates in a circumferential direction.
The beneficial effects of the invention are as follows：Annular mounting groove is equipped in machine table top end surface, by turning in annular mounting groove
Dynamic bearing is rotatably equipped with rotating disc, and the first cavity being symmetrical set and front and back right is respectively arranged in rotating disc
The second cavity for claiming setting, is respectively equipped with the first clamping device and the second clamping device in the first cavity and the second cavity, and first
Clamping device includes the first sliding groove and be slideably positioned in the first cunning that connection is set in two the first cavity bottom walls in left and right
The first sliding shoe at left and right sides of slot is moved, sliding motor, the first sliding are installed at the first sliding groove inner hub location
Screw-thread fit is equipped with the first threaded rod in block, and two the first threaded rod inner ends connect with power at left and right sides of sliding motor respectively
It connects, two one end of the first threaded rod far from sliding motor are rotatably set to inner wall at left and right sides of the first sliding groove respectively
In, left linking arm and right linking arm are installed at the top of two the first sliding shoes respectively, left linking arm right end face lower section is solid
It is fixed to be equipped with left guide rod extended to the right, right guide rod extended to the left is fixed with above right linking arm left end face,
It is equipped with driving device in machine table between two the first cavitys in left and right, driving device includes symmetrical above and below is set in machine table
Driver slot and extending transversely and perforation be set to the through slot in driving groove bottom wall, it is rotatable by rotation axis in driver slot
Be provided with rotate gear, extending end is stretched into the through slot of upside and be slidably connected, the left guide rod right side on the left of right guide rod
Side extending end stretch into downside through slot in and be slidably connected, right guide rod and left guide rod top end surface are equipped with and rotate
Gear engages the rack of setting, and electric rotating machine, the revolving spindle of electric rotating machine are fixedly installed at mounting groove bottom wall central position
Enter in mounting groove and be fixedly connected at top and rotating disc bottom centre, to can be achieved at the same time to round piece all around four
A direction grips, and can greatly simplify clamping installation steps, improves working efficiency, can greatly increase clamping stability, together
When apparatus of the present invention can carry out automatic rotating operation to the round piece after gripping, practicability is high.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and what is described in the above embodiment and the description is only the present invention
Principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these variation and
Improvement is both fallen in claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (6)
1. a kind of clamp assembly of novel clamping workpiece, including machine table, it is characterised in that：It is set in the machine table top end surface
There is an annular mounting groove, rotating disc is rotatably equipped with by rolling bearing in the annular mounting groove, in the rotating disc point
It is not provided with the first cavity being symmetrical set and front and back symmetrically arranged second cavity, first cavity and the second chamber
The first clamping device and the second clamping device are respectively equipped in body, first clamping device includes that connection is set to described in left and right
The first sliding groove in two the first cavity bottom walls and be slideably positioned at left and right sides of first sliding groove first
Sliding shoe is installed with sliding motor at the first sliding groove inner hub location, and screw thread is matched in first sliding shoe
Conjunction is equipped with the first threaded rod, and two first threaded rod inner ends connect with power at left and right sides of the sliding motor respectively
It connects, it is left that the two described one end of first threaded rod far from the sliding motor are rotatably set to first sliding groove respectively
In right both sides inner wall, it is installed with left linking arm and right linking arm, the left company respectively at the top of two first sliding shoes
It connects and is fixed with left guide rod extended to the right below arm right end face, be fixed with above the right linking arm left end face
Extended right guide rod to the left controls and is equipped with driving device in the machine table between two first cavitys, described
Driving device includes the driver slot being set in the machine table and extending transversely symmetrical above and below and perforation is set to the drive
Through slot in dynamic groove bottom wall is rotatably provided with rotate gear in the driver slot by rotation axis, and the right guide rod is left
Side extending end is stretched into the through slot of upside and be slidably connected, on the right side of left guide rod extending end stretch on the downside of institute
It states in through slot and is slidably connected, the right guide rod and the left guide rod top end surface are equipped with and are nibbled with the rotate gear
The rack of setting is closed, electric rotating machine, the rotary shaft of the electric rotating machine are fixedly installed at mounting groove bottom wall central position
It stretches into the mounting groove and is fixedly connected at top and the rotating disc bottom centre.
2. a kind of clamp assembly of novel clamping workpiece according to claim 1, it is characterised in that：The second clamping dress
The advancing slip motion block including being slideably positioned in former and later two described second cavitys and rear sliding shoe are set, under the advancing slip motion block inside
Screw-thread fit is equipped with the second threaded rod of the setting that extends back at side, and screw-thread fit is installed at the rear sliding shoe inner upper
Have a forward extended third threaded rod, on rear side of second threaded rod extending end stretch into the driver slot of downside and
It is fixedly connected with the rotate gear front end face of downside, extending end stretches into the described of upside on front side of the third threaded rod
It is fixedly connected in driver slot and with the rotate gear back end surface of upside.
3. a kind of clamp assembly of novel clamping workpiece according to claim 1, it is characterised in that：Left and right two described the
One cavity roof is respectively equipped with the first slide opening outside connection, is slided respectively in two first slide openings in left and right and is provided with left cunning
Dynamic protrusion and right sliding protrusion, the left sliding protrusion top are fixed with left holding ring, and the right sliding protrusion top is fixed
Equipped with right holding ring.
4. a kind of clamp assembly of novel clamping workpiece according to claim 2, it is characterised in that：Former and later two described
Two cavity roofs are respectively equipped with the second external slide opening of connection, slided respectively in former and later two described second slide openings be provided with it is advancing slip
Dynamic protrusion and rear slide are protruded, and front slide protrusion top is fixed with fore-clamp held in ring, and it is fixed that protrusion top is slided after described
Equipped with rear holding ring.
5. a kind of clamp assembly of novel clamping workpiece according to claim 1, it is characterised in that：The left holding ring,
Right holding ring, fore-clamp held in ring and rear holding ring inner side end are fixed with friction plate.
6. a kind of clamp assembly of novel clamping workpiece according to claim 1, it is characterised in that：In the left linking arm
The left wears groove passed through for the right guide rod is equipped with above portion, the right linking arm lower inside is equipped with and is worn for the left guide rod
The right wears groove crossed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810187249.6A CN108436513A (en) | 2018-03-07 | 2018-03-07 | A kind of clamp assembly of novel clamping workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810187249.6A CN108436513A (en) | 2018-03-07 | 2018-03-07 | A kind of clamp assembly of novel clamping workpiece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108436513A true CN108436513A (en) | 2018-08-24 |
Family
ID=63193579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810187249.6A Withdrawn CN108436513A (en) | 2018-03-07 | 2018-03-07 | A kind of clamp assembly of novel clamping workpiece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108436513A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109015471A (en) * | 2018-09-18 | 2018-12-18 | 大族激光科技产业集团股份有限公司 | A kind of clamping device |
| CN109483265A (en) * | 2018-12-18 | 2019-03-19 | 宁波碧达机械科技有限公司 | A kind of fixture of adjustable work-piece position |
| CN111002073A (en) * | 2020-01-03 | 2020-04-14 | 杨顺水 | Workpiece positioning frame |
| CN111941106A (en) * | 2020-08-21 | 2020-11-17 | 湖南机电职业技术学院 | Twist drill clamp convenient to mount and used for four-station tool rest of numerically controlled lathe |
| CN112139909A (en) * | 2020-09-27 | 2020-12-29 | 广州图宇科技有限公司 | Moving and steering mechanism for polishing clamp of optical lens |
| CN112894676A (en) * | 2021-01-25 | 2021-06-04 | 四川沃特尔管业有限公司 | Butt joint device for processing prestressed steel cylinder concrete pipe |
-
2018
- 2018-03-07 CN CN201810187249.6A patent/CN108436513A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109015471A (en) * | 2018-09-18 | 2018-12-18 | 大族激光科技产业集团股份有限公司 | A kind of clamping device |
| CN109483265A (en) * | 2018-12-18 | 2019-03-19 | 宁波碧达机械科技有限公司 | A kind of fixture of adjustable work-piece position |
| CN111002073A (en) * | 2020-01-03 | 2020-04-14 | 杨顺水 | Workpiece positioning frame |
| CN111002073B (en) * | 2020-01-03 | 2021-03-09 | 杨顺水 | Workpiece positioning frame |
| CN111941106A (en) * | 2020-08-21 | 2020-11-17 | 湖南机电职业技术学院 | Twist drill clamp convenient to mount and used for four-station tool rest of numerically controlled lathe |
| CN112139909A (en) * | 2020-09-27 | 2020-12-29 | 广州图宇科技有限公司 | Moving and steering mechanism for polishing clamp of optical lens |
| CN112894676A (en) * | 2021-01-25 | 2021-06-04 | 四川沃特尔管业有限公司 | Butt joint device for processing prestressed steel cylinder concrete pipe |
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Application publication date: 20180824 |