CN109202105A - A kind of quick top fixture and application method for cutter - Google Patents
A kind of quick top fixture and application method for cutter Download PDFInfo
- Publication number
- CN109202105A CN109202105A CN201811094578.2A CN201811094578A CN109202105A CN 109202105 A CN109202105 A CN 109202105A CN 201811094578 A CN201811094578 A CN 201811094578A CN 109202105 A CN109202105 A CN 109202105A
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- China
- Prior art keywords
- mounting board
- circular groove
- screw thread
- stop collar
- spring
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B23/00—Tailstocks; Centres
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling, Drilling, And Turning Of Wood (AREA)
Abstract
The present invention provides a kind of quick top fixture and application method for cutter, including apparatus main body, movable installing mechanism and local replacing mechanism, described device main body includes front cover and mounting board disk, the front cover rear end face fits with mounting board disk front end face, the activity installing mechanism is mounted on mounting board disk front end, the activity installing mechanism includes including top, screw one, rear cover, spring, circular groove one and stop collar two, the local replacing mechanism is mounted on mounting board disk leading exterior surface, the local replacing mechanism includes dovetail slot, dovetail item, external screw thread ring, counter sink two and screw two, the present invention has the advantages that, movable installation is achieved the purpose that, centering is not needed, it improves efficiency, be conducive to produce in batches, have also achieved the purpose of replacement external screw thread ring.
Description
Technical field
The present invention is a kind of quick top fixture and application method for cutter, belongs to clamp art.
Background technique
It is top be machining in machine tool component, have outer diameter it is small, interference knife it is less, be suitable for high revolving speed, moderate
The features such as cuttingization, top in the workplaces such as machining, finishing not have movable installation function, flexible structure degree is not
Foot, machining accuracy is low, and runout error is big, does not have local replacing function, external screw thread when installing viton seal ring using front cover
Entirety waste resource wastage is big when stripped thread.
Summary of the invention
In view of the deficienciess of the prior art, it is an object of the present invention to provide a kind of quick top fixture for cutter and making
With method, to solve the problems mentioned in the above background technology, the present invention is easy to use, and convenient for operation, stability is good, reliability
It is high.
To achieve the goals above, the present invention is to realize by the following technical solutions: a kind of for the quick of cutter
Top fixture, including apparatus main body, movable installing mechanism and local replacing mechanism, described device main body include front cover and folder
Chuck, the front cover rear end face fit with mounting board disk front end face, and the activity installing mechanism is mounted on mounting board disk front end, described
Movable installing mechanism includes including top, screw one, rear cover, spring, circular groove one and stop collar two, the local replacing mechanism
It is mounted on mounting board disk leading exterior surface, the local replacing mechanism includes dovetail slot, dovetail item, external screw thread ring, counter sink
Two and screw two.
Further, in the movable installing mechanism, top front cover front end and the top rear end of being mounted on successively is worn
It crosses front cover and mounting board disk and is mounted in circular groove one, the rear cover front end face fits with mounting board back-end disk face, and rear cover back-end
Face processes counter sink one, and the mounting board back-end disk processes tapped blind hole one, and the screw one passes through counter sink one and is engaged on screw thread
In blind hole one, the circular groove one is provided with mounting board back-end disk face middle position, and the spring is arranged in circular groove one and spring is set
It sets on rear side of top annular side.
It further, further include restraining position ring block two, the stop collar two is arranged top in the movable installing mechanism
On rear side of annular side and stop collar two is an integral molding structure with top, and the spring at front end is in contact with two rear end of stop collar,
Two front end of stop collar is in contact with one inner front wall of circular groove, and the specification of the spring is 40 × 16 × 3, is actually using
When, it is top moved backward along circular groove one after drive stop collar two move backward, thus realize stop collar two squeeze spring, force
Elastic deformation occurs for spring, realizes that elasticity squeezes the purpose of top clamping workpiece, when top not clamping workpiece, stop collar with this
Two front end faces and one inner front wall of circular groove, which fit, avoids the top abjection inside mounting board disk, has achieved the purpose that limit.
Further, in the movable installing mechanism, top frustoconical bevel angle is 60 °, and roughness 0.8 actually makes
Used time uses frustoconical bevel angle to be engaged for 60 ° of design is convenient with workpiece both ends progress line, reduces runout error.
Further, in the local replacing component, the dovetail slot is provided with mounting board disk leading exterior surface, described
Dovetail item assigns into dovetail slot and dovetail item is an integral molding structure with external screw thread ring, and the external screw thread ring setting exists
Counter sink two is processed on rear side of mounting board disk leading exterior surface and external screw thread ring annular side, the screw two is mounted in counter sink two
And screw two passes through counter sink two and is connected with mounting board disk.
Further, in the local replacing component, the dovetail slot, dovetail item, counter sink two and screw
Two are equipped with two groups, and dovetail slot described in two groups is symmetrically provided with mounting board disk leading exterior surface, the difference of dovetail item described in two groups
It assigns into two groups of dovetail slots, counter sink two described in two groups is symmetrically provided on rear side of external screw thread ring annular side, described in two groups
Screw two is separately mounted in two groups of counter sinks two, when stripped thread phenomenon occurs for external screw thread ring, by two groups of screws two respectively from two
It is removed in group counter sink two, twitches external screw thread ring forward, realize that external screw thread annulus moves dovetail item and is detached from dovetail slot, realization is torn open
Unload the purpose of replacement external screw thread ring.
Further, the front cover front end is machined with through-hole and through-hole inner surface opens up annular groove, peace in the annular groove
Viton seal ring is filled, the specification of the viton seal ring is 16 × 2, and mounting board disk front end opens up circular groove two and circular groove two
Both ends are communicated with circular groove one and through-hole respectively, and the top front end passes through through-hole and circular groove two and is mounted in circular groove one, institute
Mounting board disc-annular shape side front side is stated equipped with stop collar one and stop collar one is an integral molding structure with mounting board disk, is being actually used
When, when it is top moved along through-hole and circular groove one when, viton seal ring can prevent impurity from entering in through-hole, improve top
The reliability of work, the design of stop collar one reduce the installation difficulty of mounting board disk.
Further, it is M60 × 1.5 that the front cover aft end interior surface, which is machined with internal screw thread and dimension of inner screw thread, before described
Lid is engaged in external screw thread ring annular side by internal screw thread, when covering in a pre-installation, front cover is rotated along external screw thread ring, by interior
Front cover is mounted on external screw thread ring by screw thread and externally threaded engagement, achievees the purpose that convenient installation front cover.
The present invention provides a kind of application methods of quick top fixture for cutter, include the following steps:
(1) it assembles: sequentially passing through circular groove one and circular groove two from back to front by top and extend on front side of mounting board disk, so that top
Sharp rear end is hidden in circular groove one and realizes that two front end of stop collar fits with one inner front wall of circular groove, by spring pocket mounted in top
It goes up and spring at front end is contacted with stop collar two, rear cover is mounted on mounting board back-end disk face and keeps counter sink one and screw thread blind
Just, spring rear end is in contact with rear cover front end at this time is threaded into screw one in blind hole one across counter sink to hole a pair together,
Complete rear cover installation, realize spring be hidden in circular groove one, by the through-hole on front cover pass through it is top after using internal screw thread will before
Lid is engaged on external screw thread ring, completes the assembly of front cover.
(2) use: by workpiece one end resist it is top it is backward after squeeze it is top, it is top to be squeezed movement backward and drive limit
Ring two moves backward in circular groove one, forces spring that elastic deformation occurs so that stop collar two squeezes spring, continues to squeeze top
Until the workpiece other end resists the stationary center matched on lathe, workpiece is unclamped, top and stop collar two is in recoil of spring power
Under the action of counter motion, realize two groups of top collective effect clamping workpieces, facilitate machining.
Beneficial effects of the present invention: a kind of quick top fixture and application method for cutter of the invention, Yin Benfa
Bright to be added to top, tapped blind hole one, counter sink one, screw one, spring, circular groove one and stop collar two, which utilizes bullet
The top positioning clamping workpiece of spring pressing, structure novel do not have to centering, and convenient and efficient, processing dimension is stablized.
Because being added to dovetail slot, dovetail item, external screw thread ring, counter sink two and screw two, which has reached more
Change the purpose of external screw thread ring.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is that the present invention is a kind of for the quick top fixture of cutter and the structural schematic diagram of application method；
Fig. 2 is enlarged diagram at A in a kind of quick top fixture and application method for cutter of the present invention；
Fig. 3 is the left view of mounting board disk in a kind of quick top fixture and application method for cutter of the present invention；
In figure: 1- front cover, 2- viton seal ring, 3- be top, 4- mounting board disk, 5- local replacing mechanism, 6- stop collar one,
7- tapped blind hole one, 8- counter sink one, 9- screw one, 10- rear cover, 11- spring, 12- circular groove one, 13- stop collar two, 51- swallow
Tail tongue-and-groove, 52- dovetail item, 53- external screw thread ring, 54- counter sink two, 55- screw two.
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to
Specific embodiment, the present invention is further explained.
Fig. 1-Fig. 3 is please referred to, the present invention provides a kind of technical solution: a kind of quick top fixture for cutter, including
Apparatus main body, movable installing mechanism and local replacing mechanism, apparatus main body include front cover 1 and mounting board disk 4,1 rear end of front cover
Face fits with 4 front end face of mounting board disk, and movable installing mechanism is mounted on 4 front end of mounting board disk, and movable installing mechanism includes including top
Point 3, screw 1, rear cover 10, spring 11, circular groove 1 and stop collar 2 13, before local replacing mechanism is mounted on mounting board disk 4
Outer surface is held, local replacing mechanism includes dovetail slot 51, dovetail item 52, external screw thread ring 53, counter sink 2 54 and screw
2 55.
In movable installing mechanism, top 3, which are mounted on 1 front end of front cover and top 3 rear end, sequentially passes through front cover 1 and mounting board disk
It 4 and is mounted in circular groove 1,10 front end face of rear cover fits with 4 rear end face of mounting board disk, and 10 rear end face of rear cover processes countersunk head
Hole 1,4 rear end of mounting board disk process tapped blind hole 1, and screw 1 passes through counter sink 1 and is engaged in tapped blind hole 1, circular groove
One 12 are provided with 4 rear end face middle position of mounting board disk, and spring 11 is arranged in circular groove 1 and the setting of spring 11 is in top 3 annular
On rear side of side.
In local replacing component 5, dovetail slot 51 is provided with 4 leading exterior surface of mounting board disk, and dovetail item 52 assigns into
In dovetail slot 51 and dovetail item 52 is an integral molding structure with external screw thread ring 53, and external screw thread ring 53 is arranged before mounting board disk 4
It holds and processes counter sink 2 54 on rear side of outer surface and 53 annular side of external screw thread ring, screw 2 55 is mounted in counter sink 2 54 and spiral shell
2 55 are followed closely to be connected across counter sink 2 54 with mounting board disk 4.
As a kind of embodiment of the invention: further including restraining position ring block 2 13, stop collar 2 13 in movable installing mechanism
It is arranged on rear side of top 3 annular side and stop collar 2 13 is an integral molding structure with top 3,11 front end of spring and stop collar two
13 rear ends are in contact, and 2 13 front end of stop collar is in contact with one 12 inner front wall of circular groove, and the specification of spring 11 is 40 × 16 × 3,
In actual use, top 3 moved backward along circular groove 1 after drive stop collar 2 13 move backward, to realize stop collar
2 13 squeeze spring 11, force spring 11 that elastic deformation occurs, and realize that elasticity squeezes the purpose of top 3 clamping workpiece with this, when
Top 3 not clamping workpiece when, 2 13 front end face of stop collar and one 12 inner front wall of circular groove, which fit, to be avoided top 3 from mounting board disk 4
Inside abjection, has achieved the purpose that limit.
As a kind of embodiment of the invention: in movable installing mechanism, top 3 frustoconical bevel angle is 60 °, and roughness is
0.8, in actual use, uses frustoconical bevel angle to be engaged for 60 ° of design is convenient with workpiece both ends progress line, reduce bounce
Error.
As a kind of embodiment of the invention: in local replacing component 5, dovetail slot 51, dovetail item 52, counter sink
2 54 and screw 2 55 be equipped with two groups, two groups of dovetail slots 51 are symmetrically provided with 4 leading exterior surface of mounting board disk, two groups of dovetails
Tenon item 52 is assigned into respectively in two groups of dovetail slots 51, after two groups of counter sinks 2 54 are symmetrically provided with 53 annular side of external screw thread ring
Side, two groups of screws 2 55 are separately mounted in two groups of counter sinks 2 54, when stripped thread phenomenon occurs for external screw thread ring 53, by two groups of spiral shells
It follows closely 2 55 to remove out of two groups counter sinks 2 54 respectively, twitches external screw thread ring 53 forward, realize that external screw thread ring 53 drives dovetail
Item 52 is detached from dovetail slot 51, realizes the purpose of dismounting and change external screw thread ring 53.
As a kind of embodiment of the invention: 1 front end of front cover is machined with through-hole and through-hole inner surface opens up annular groove, annular
Viton seal ring 2 is installed, the specification of viton seal ring 2 is 16 × 2, and 4 front end of mounting board disk opens up circular groove two and circular groove in slot
Two both ends are communicated with circular groove 1 and through-hole respectively, and top 3 front end passes through through-hole and circular groove two and is mounted in circular groove 1,
Stop collar 1 is equipped on front side of 4 annular side of mounting board disk and stop collar 1 is an integral molding structure with mounting board disk 4, is being actually used
When, when top 3 move along through-hole and circular groove 1, viton seal ring 2 can prevent impurity from entering in through-hole, improve
The reliability of top 3 work, the design of stop collar 1 reduce the installation difficulty of mounting board disk 4.
As a kind of embodiment of the invention: 1 aft end interior surface of front cover be machined with internal screw thread and dimension of inner screw thread be M60 ×
1.5, front cover 1 is engaged in 53 annular side of external screw thread ring by internal screw thread, in a pre-installation when lid 1, along 53 turns of external screw thread ring
Front cover 1 is mounted on external screw thread ring 53, before reaching convenient installation by dynamic front cover 1 by internal screw thread and externally threaded engagement
The purpose of lid 1.
A kind of application method of the quick top fixture for cutter, includes the following steps:
(1) it assembles: sequentially passing through circular groove 1 and circular groove two from back to front for top 3 and extend to 4 front side of mounting board disk, make
It obtains top 3 rear end to be hidden in circular groove 1 and realize that 2 13 front end of stop collar fits with one 12 inner front wall of circular groove, by bullet
Spring 11 is sleeved on top 3 and 11 front end of spring is contacted with stop collar 2 13, and rear cover 10 is mounted on 4 rear end face of mounting board disk
And keeping one 7 pairs of counter sink 1 and tapped blind hole just, 11 rear end of spring is in contact with 10 front end of rear cover and wears screw 1 at this time
It crosses counter sink 1 and is threaded into blind hole 1, complete the installation of rear cover 10, realize that spring 11 is hidden in circular groove 1, it will
Front cover 1 is engaged on external screw thread ring 53 after passing through top 3 using internal screw thread by the through-hole on front cover 1, completes the assembly of front cover 1.
(2) it uses: being squeezed movement backward to rear extruding top 3, top 3 after workpiece one end is resisted top 3 and drive
Stop collar 2 13 moves backward in circular groove 1, forces spring 11 that elastic shape occurs so that stop collar 2 13 squeezes spring 11
Become, continue to squeeze top 3 until the workpiece other end resists the stationary center 3 matched on lathe, unclamps workpiece, top 3 and limit
Position counter motion under the action of 11 screen resilience of spring of ring 2 13 realizes two groups of top 3 collective effect clamping workpieces, machine is facilitated to add
Work.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, for this field skill
For art personnel, it is clear that invention is not limited to the details of the above exemplary embodiments, and without departing substantially from spirit of the invention or
In the case where essential characteristic, the present invention can be realized in other specific forms.Therefore, in all respects, should all incite somebody to action
Embodiment regards exemplary as, and is non-limiting, the scope of the present invention by appended claims rather than on state
Bright restriction, it is intended that including all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention
It is interior.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (9)
1. a kind of quick top fixture for cutter, including apparatus main body, movable installing mechanism and local replacing mechanism,
Be characterized in that: described device main body includes front cover and mounting board disk, and the front cover rear end face fits with mounting board disk front end face, institute
State movable installing mechanism and be mounted on mounting board disk front end, the activity installing mechanism include including top, screw one, rear cover, spring,
Circular groove one and stop collar two, the local replacing mechanism are mounted on mounting board disk leading exterior surface, local replacing mechanism packet
Include dovetail slot, dovetail item, external screw thread ring, counter sink two and screw two.
2. a kind of quick top fixture for cutter according to claim 1, it is characterised in that: in the activity installation
In mechanism, it is described it is top be mounted on front cover front end and top rear end sequentially passes through front cover and mounting board disk and is mounted in circular groove one,
The rear cover front end face fits with mounting board back-end disk face, and rear cover rear end face processes counter sink one, and the mounting board back-end disk adds
Work tapped blind hole one, the screw one pass through counter sink one and are engaged in tapped blind hole one, and the circular groove one is provided with mounting board disk
Rear end face middle position, the spring is arranged in circular groove one and spring is arranged on rear side of top annular side.
3. a kind of quick top fixture for cutter according to claim 2, it is characterised in that: in the activity installation
It further include restraining position ring block two in mechanism, the stop collar two is arranged on rear side of top annular side and stop collar two is with top
Integrated formed structure, the spring at front end are in contact with two rear end of stop collar, before two front end of stop collar and one inside of circular groove
Wall is in contact, and the specification of the spring is 40 × 16 × 3, in actual use, it is top moved backward along circular groove one after drive
Stop collar two moves backward, to realize that stop collar two squeezes spring, forces spring that elastic deformation occurs, and realizes that elasticity is squeezed with this
The purpose for sharp clamping workpiece of bearing down on one, when top not clamping workpiece, two front end face of stop collar fits with one inner front wall of circular groove
The top abjection inside mounting board disk is avoided, has achieved the purpose that limit.
4. a kind of quick top fixture for cutter according to claim 2, it is characterised in that: in the activity installation
In mechanism, top frustoconical bevel angle is 60 °, roughness 0.8, in actual use, uses frustoconical bevel angle convenient for 60 ° of design
Line is carried out with workpiece both ends to be engaged, and reduces runout error.
5. a kind of quick top fixture for cutter according to claim 1, it is characterised in that: in the local replacing
In component, the dovetail slot is provided with mounting board disk leading exterior surface, and the dovetail item assigns into dovetail slot and dovetail
Tenon item is an integral molding structure with external screw thread ring, and the external screw thread ring setting is in mounting board disk leading exterior surface and external screw thread ring annular
Counter sink two is processed on rear side of side, the screw two is mounted in counter sink two and screw two passes through counter sink two and mounting board disk phase
Connection.
6. a kind of quick top fixture for cutter according to claim 5, it is characterised in that: in the local replacing
In component, the dovetail slot, dovetail item, counter sink two and screw two are equipped with two groups, dovetail slot pair described in two groups
Title is provided with mounting board disk leading exterior surface, and dovetail item described in two groups is assigned into respectively in two groups of dovetail slots, sinks described in two groups
Head bore two is symmetrically provided on rear side of external screw thread ring annular side, and screw two described in two groups is separately mounted in two groups of counter sinks two,
When stripped thread phenomenon occurs for external screw thread ring, two groups of screws two are removed out of two groups counter sinks two respectively, twitch external screw thread forward
Ring realizes that external screw thread annulus moves dovetail item and is detached from dovetail slot, realizes the purpose of dismounting and change external screw thread ring.
7. a kind of quick top fixture for cutter according to claim 1, it is characterised in that: the front cover front end adds
Work has through-hole and through-hole inner surface opens up annular groove, installs viton seal ring, the viton seal ring in the annular groove
Specification be 16 × 2, mounting board disk front end opens up circular groove two and two both ends of circular groove are communicated with circular groove one and through-hole respectively, described
Top front end passes through through-hole and circular groove two and is mounted in circular groove one, and stop collar one is equipped on front side of mounting board disc-annular shape side
And stop collar one is an integral molding structure with mounting board disk, in actual use, when it is top moved along through-hole and circular groove one when, fluorine
Rubber seal can prevent impurity from entering in through-hole, improve the reliability of top work, and the design of stop collar one reduces
The installation difficulty of mounting board disk.
8. a kind of quick top fixture for cutter according to claim 1, it is characterised in that: in the preceding cover back-end
It is M60 × 1.5 that surface, which is machined with internal screw thread and dimension of inner screw thread, and the front cover is engaged on external screw thread ring annular side by internal screw thread
On face, when covering in a pre-installation, front cover is rotated along external screw thread ring, front cover is installed with externally threaded engagement by internal screw thread
In outer screwed ring, achieve the purpose that convenient installation front cover.
9. a kind of application method of quick top fixture for cutter according to claim 1, it is characterised in that: including
Following steps:
(1) it assembles: sequentially passing through circular groove one and circular groove two from back to front by top and extend on front side of mounting board disk, so that after top
End is hidden in circular groove one and realizes that two front end of stop collar fits with one inner front wall of circular groove, and spring pocket is mounted on top simultaneously
So that spring at front end is contacted with stop collar two, rear cover is mounted on mounting board back-end disk face and keeps counter sink one and tapped blind hole one
To just, spring rear end is in contact with rear cover front end at this time screw one is threaded into blind hole one together across counter sink, is completed
The installation of rear cover realizes that spring is hidden in circular groove one, and the through-hole on front cover is afterwards nibbled front cover using internal screw thread across top
It closes in outer screwed ring, completes the assembly of front cover.
(2) use: by workpiece one end resist it is top it is backward after squeeze it is top, it is top to be squeezed movement backward and drive stop collar two
Moved backward in circular groove one, force spring that elastic deformation occurs so that stop collar two squeezes spring, continue to squeeze it is top until
The workpiece other end resists the stationary center matched on lathe, unclamps workpiece, work of the top and stop collar two in recoil of spring power
With lower counter motion, realizes two groups of top collective effect clamping workpieces, facilitate machining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811094578.2A CN109202105A (en) | 2018-09-19 | 2018-09-19 | A kind of quick top fixture and application method for cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811094578.2A CN109202105A (en) | 2018-09-19 | 2018-09-19 | A kind of quick top fixture and application method for cutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109202105A true CN109202105A (en) | 2019-01-15 |
Family
ID=64984740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811094578.2A Pending CN109202105A (en) | 2018-09-19 | 2018-09-19 | A kind of quick top fixture and application method for cutter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109202105A (en) |
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| CN110843048A (en) * | 2019-11-28 | 2020-02-28 | 贵州创宇生物科技有限公司 | Positioning mechanism is used in processing of jumbo size log for agriculture and forestry |
| CN110976923A (en) * | 2019-12-18 | 2020-04-10 | 广州市昊志机电股份有限公司 | Centre, centre clamp holder and centre automatic switching device |
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| CN110843048A (en) * | 2019-11-28 | 2020-02-28 | 贵州创宇生物科技有限公司 | Positioning mechanism is used in processing of jumbo size log for agriculture and forestry |
| CN110976923A (en) * | 2019-12-18 | 2020-04-10 | 广州市昊志机电股份有限公司 | Centre, centre clamp holder and centre automatic switching device |
| CN110976923B (en) * | 2019-12-18 | 2021-11-16 | 广州市昊志机电股份有限公司 | Centre clamp holder and centre automatic switching control equipment |
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Application publication date: 20190115 |