CN104723211B - A kind of large-scale sharpening machine pressure cylinder fixing device and preparation method thereof - Google Patents
A kind of large-scale sharpening machine pressure cylinder fixing device and preparation method thereof Download PDFInfo
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- CN104723211B CN104723211B CN201510107208.8A CN201510107208A CN104723211B CN 104723211 B CN104723211 B CN 104723211B CN 201510107208 A CN201510107208 A CN 201510107208A CN 104723211 B CN104723211 B CN 104723211B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Joining Of Building Structures In Genera (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The invention discloses a kind of large-scale sharpening machine pressure cylinder fixing device and preparation method thereof, belong to smelter and produce auxiliary equipment field.Cylinder axis is changed to cone axis by the present invention, shortens the length of mating surface, it is to avoid the phenomenon that assembling and dissembling process is wasted time and energy；Tapered sleeve adopts cast copper material, it is possible to reduce the wear extent to cone axis；The tensioner slot structure at transparent cover seam position may insure that transparent cover and the endoporus of the second annulus remain tight fit；Transparent cover easily can be dismantled by dismounting screw；1:20 taper fit structures can compensate wear extent, extends the service life of this structure；By ruling in production scene and cutting out Φ 140mm circular hole, assembling, spot welding, adjustment, welding, polishing welding seams, weld seam carried out shake Ageing Treatment, eliminate welding stress, structure can be completed on the basis of keeping original agent structure and improve.
Description
Technical field
The present invention relates to a kind of large-scale sharpening machine pressure cylinder fixing device and preparation method thereof, belong to smelter production auxiliary
Help apparatus field.
Background technology
Sharpening machine is the equipment that continuous casting billet surface is processed, and pressure cylinder controls lifting and the depressing force of reconditioning machine host
Size, suffered active force is in dynamic change, and the vibrations producing during reconditioning can be directly delivered to pressure cylinder, is to repair
The critical component of grinding machine.As shown in Figure 1 and Figure 2, the top of pressure cylinder 6 is arranged in the frame structure of main frame, the framework knot of main frame
Structure is welded together with column 1；It is originally by a cylinder axis 5, through the endoporus of the bearing 7 on pressure cylinder 6 top, by back-up ring
Bearing 7 is positioned by 8, is matched with the endoporus of framework the first plate 9 and framework the second plate 2 respectively in the two ends of cylinder axis 5, and wherein one
End is installed with clamp 3, and clamp 3 is fixing by the first bolt 4, realizes the positioning to cylinder axis 5 and anti-rotation function.
Originally there is problems with structure：1st, the external diameter value of cylinder axis 5 is just as in whole length, makes mating surface
Length oversize, assembling and dissembling process is wasted time and energy, and makes the interior of the cylindrical of cylinder axis 5 and framework the first plate 9 and framework the second plate 2
Hole serious wear；2nd, no wear-compensating structure, under the vibrations of the honed journey of repairing and the abrasion collective effect of assembling process, easily makes
The gap width between cylindrical and framework first plate 9 of cylinder axis 5 and the endoporus of framework the second plate 2 is become to increase, impact pressure cylinder 6
Service behaviour, and the frame structure of main frame is a huge structural member, is difficult to change, and in order to maintain production, can only make
With welding method, cylinder axis 5 is connect with framework the first plate 9 and framework the second plate 2, need again commissure to be entered during dismounting
Row cuts and welds again, leads to cylinder axis 5 to be badly damaged with framework the first plate 9 and framework the second plate 2.
Content of the invention
The present invention provides a kind of large-scale sharpening machine pressure cylinder fixing device, shortens mating surface by designing circular cone axle construction
Length, can avoid the phenomenon that disassembly process wastes time and energy, and reduce cylindrical and framework first plate of axle and the interior of framework second plate
The wear extent in hole, by being reduced and be compensated wear extent using cone axis, cast copper tapered sleeve and the transparent cover structure with Tensioning structure；
Present invention also offers the manufacture method of this fixing device, by production scene rule and cut out Φ 140 circular hole, assembling,
Spot welding, adjustment, welding, polishing welding seams, the Ageing Treatment that weld seam carried out shake, elimination welding stress, can keep originally leading
Complete structure on the basis of body structure to improve.
The present invention employs the following technical solutions realization：
The invention provides a kind of large-scale sharpening machine pressure cylinder fixing device, including axle, axle two ends connection framework the respectively
One plate and framework second plate, framework first plate and framework second plate are fixed on column, and the top of pressure cylinder is arranged on main frame
Between framework first plate and framework second plate it is characterised in that：Described axle is cone axis, is cone axis first paragraph in the middle part of axle, should
Section is column structure, and axle left end is cone axis second segment, and axle right-hand member is the 3rd section of cone axis, cone axis second segment and cone axis the
Three sections of taper is 1：20, it is provided with tapered sleeve outside cone axis second segment, the interior external taper of this tapered sleeve is 1：20, outside tapered sleeve be
First annulus, the first annulus is nested in framework first plate, is provided with the second annulus in the 3rd section of outside of cone axis, the second annulus is embedding
It is enclosed within framework second plate, the right side that the 3rd section of cone axis is provided with transparent cover, transparent cover left end is seam, transparent cover center is provided with taper hole,
The 3rd section of cooperation of transparent cover internal taper hole and cone axis, transparent cover seam is contacted with the second annulus, and the second annulus end face is provided with screw,
The end face of transparent cover is provided with via and dismounting screw.
It is conical bore inside described first annulus, tapered sleeve passes through from this hole.
It is cylindrical hole inside described second annulus, the sleeve of transparent cover passes through from this hole.
Described first annulus and the second annulus are annular slab, and the edge of the both ends of the surface of annular slab all has chamfering to tie
Structure.
The internal taper hole at described transparent cover center is 1:20 tapers, transparent cover seam is radially even to be provided with four tensioner grooves.
Radially distributed two dismounting screws in described transparent cover, bolt passes through this dismounting screw that transparent cover is fixed on framework the
On two plates, for dismantling transparent cover.
Six vias are uniformly distributed on described transparent cover, the second bolt passes through via, transparent cover is fixed on the second annulus, keeps away
Exempt from its movement.
The invention provides a kind of manufacture method of above-mentioned large-scale sharpening machine pressure cylinder fixing device, comprise the following steps：
（1）Cut out Φ 140mm circular hole in the center of framework first plate, cut out Φ in the center of framework second plate
140mm circular hole；
（2）Process the first annulus, make the thickness value of the first annulus equal with the thickness value of framework first plate, the first annulus
External diameter value is Φ 140mm, and the taper of the first annulus internal taper hole is 1:20, size value is matched with tapered sleeve male cone (strobilus masculinus)；First annulus
Both sides are cylindrical all to process 10 × 45 grooves；
（3）Process the second annulus, make the thickness value of the second annulus equal with the thickness value of framework second plate, the second annulus
External diameter value is Φ 140mm, and the diameter of bore of the second annulus is Φ 73（+0.03 0）mm（It is dimensional tolerance in bracket）, the second annulus two
Side is cylindrical all to process 10 × 45 grooves；
（4）Tapered sleeve is installed to cone axis second segment, the first annulus internal taper hole is inserted in tapered sleeve male cone (strobilus masculinus), transparent cover is installed
To on cone axis, so that transparent cover internal taper hole is matched for the 3rd section with cone axis, the above-mentioned cone axis assembly assembling integrally is worn
Enter in framework first plate and framework second plate, so that the thickness direction of the first annulus is alignd with framework first plate, the second annulus is pacified
It is attached to the cylindrical position of the transparent cover seam of this assembly, the axial location of adjustment the second annulus, make the thickness direction of the second annulus
Align with framework second plate；
（5）By the first annulus and framework the first plate spot welding, spring washer is installed in the second annulus and framework the second plate spot welding
With the second bolt, the position adjusting each part, it is ensured that the relativeness of each part is all correct, is welded at each groove, incites somebody to action
Each weld grinding is smooth；Carry out shaking Ageing Treatment, eliminate welding stress；
（6）Dismantle the second bolt, spring washer, take out transparent cover, cone axis, tapered sleeve.
Above-mentioned all steps are intended merely to determine the exact positions of new parts such as the first annulus, the second annulus and implement to weld
Connect, this is the core link of improvement, is now also fitted without bearing, above-mentioned final step disassembles after these parts at last
Improvement completes, and is ensuing formal installation all set condition, next just can carry out formal installment work.
The core of the technical program is：Original cylindrical structural is replaced using conical structure：The program includes one
Two ends all carry 1:The axle of the outer cone of 20 tapers, installs a tapered sleeve in cone axis second segment, and the interior external taper of this tapered sleeve is
1：20th, material is cast copper, and the male cone (strobilus masculinus) of tapered sleeve is arranged on the inner cone in the hole of the first annulus, and the first annulus is located at framework first plate
At endoporus；In the 3rd section of installation transparent cover of cone axis, transparent cover center has 1:The internal taper hole of 20 tapers, the cylindrical peace at transparent cover seam position
It is contained in the cylinder in the hole of the second annulus, the cylindrical of transparent cover seam position radially processes 4 uniform tensioner grooves, so that transparent cover is stopped
Mouth can be with the endoporus tensioner of the second annulus, and the second annulus is located at the endoporus of framework second plate；Above-mentioned tapered sleeve structure is permissible
It is fitted close and reduces wear extent each other with cone axis first paragraph and the first annulus internal taper hole, and wear extent can be compensated；
The cylindrical structure at above-mentioned transparent cover seam position has tensioner function, also can compensate wear extent.
The present invention provide sharpening machine pressure cylinder fixing device improve implement after the completion of, have compared with original structure of seat with
Lower advantage：
（1）Bearing and the mating surface contraction in length of cone axis, in cone axis and the first frame plate endoporus and the second frame plate
The mating surface contraction in length in hole, assembling process is easy；
（2）Tapered sleeve adopts cast copper material, the tensioner slot structure at the cylindrical position of transparent cover seam, it is possible to reduce to cone axis and the
One frame plate endoporus, the abrasion of the second frame plate endoporus；
（3）1:20 taper fit structures can compensate wear extent, extends the service life of this structure；
（4）Transparent cover easily can be mounted and dismounted by bolt.
The present invention will be further described with reference to the accompanying drawings and examples.
Brief description
Fig. 1 is the front view of pressure cylinder fixing device original structure.
Fig. 2 is the A-A view of pressure cylinder fixing device original structure.
Fig. 3 is the front view of structure after pressure cylinder fixing device is improved.
Fig. 4 is the B-B view of structure after pressure cylinder fixing device is improved.
Fig. 5 is cone axis structure chart.
Fig. 6 is tapered sleeve structure chart.
Fig. 7 is the first circular ring structure figure.
Fig. 8 is transparent cover front view.
Fig. 9 is the C-C view of transparent cover.
Figure 10 is the second circular ring structure figure.
In figure, 1, column, 2, framework second plate, 3, clamp, the 4, first bolt, 5, cylinder axis, 6, pressure cylinder, 7, bearing,
8th, back-up ring, 9, framework first plate, 10, cone axis, 11, tapered sleeve, the 12, first annulus, 13, transparent cover, the 14, second bolt, 15, spring
Packing ring, the 16, second annulus, 17, cone axis first paragraph, 18, cone axis second segment, 19, the 3rd section of cone axis, 20, tapered sleeve outer cone
Face, 21, tapered sleeve internal taper hole, the 22, first annulus internal taper hole, 23, screw, 24, via, 25, dismounting screw, 26, tensioner groove, 27,
Transparent cover internal taper hole, 28, transparent cover seam.
Specific embodiment
Embodiment：
As shown in Fig. 3 ~ 10, a kind of large-scale sharpening machine pressure cylinder fixing device, including axle, axle two ends connection framework the respectively
One plate 9 and framework the second plate 2, framework the first plate 9 and framework the second plate 2 are fixed on column 1, and the top of pressure cylinder 6 is arranged on
Between framework first plate of main frame and framework second plate it is characterised in that：Described axle is cone axis 10, is cone axis the in the middle part of axle
One section 17, this section is column structure, and axle left end is cone axis second segment 18, and axle right-hand member is the 3rd section 19 of cone axis, cone axis the
The taper of two-stage nitration 18 and the 3rd section 19 of cone axis is 1：20, be provided with tapered sleeve 11 outside cone axis second segment 18, this tapered sleeve 11 interior
External taper（The i.e. taper of tapered sleeve male cone (strobilus masculinus) 20 and tapered sleeve internal taper hole 21）It is 1：20, tapered sleeve 11 outside is the first annulus 12, the
The taper of one annulus internal taper hole 22 is 1：20, the first annulus 12 is nested in framework the first plate 9, outside the 3rd section 19 of cone axis
It is provided with the second annulus 16, the second annulus 16 is nested in framework the second plate 2, and the outside that the 3rd section 19 of cone axis is provided with transparent cover 13,
Transparent cover 13 left end is seam, and transparent cover center is provided with taper hole, the 3rd section of 19 cooperation of transparent cover internal taper hole 27 and cone axis, transparent cover seam 28
Contact with the second annulus 16, the second annulus end face is provided with screw 23, via 24 and dismounting spiral shell are provided with the end face of transparent cover 13
Hole 25.
Described first annulus 12 is internal to be conical bore, and tapered sleeve 11 passes through from this hole.
Described second annulus 16 is internal to be cylindrical hole, and the sleeve of transparent cover 13 passes through from this hole.
Described first annulus 12 and the second annulus 16 are annular slab, and the edge of the both ends of the surface of annular slab all has down
Corner structure.
Described transparent cover internal taper hole 27 is 1:20 tapers, transparent cover seam 28 is radially even to be provided with four tensioner grooves 26.
Radially distributed two dismounting screws 25 in described transparent cover 13, transparent cover 13 is fixed on by bolt through this dismounting screw
On framework the second plate 2, for dismantling transparent cover 13.
Six vias 24 are uniformly distributed on described transparent cover 13, the second bolt 14 passes through this via to position transparent cover, it is to avoid its shifting
Dynamic.
The present embodiment is a kind of improvement of large-scale sharpening machine pressure cylinder structure of seat, specifically includes following step：
The improvement of I pressure cylinder fixing device：
Cylinder axis 5 is changed to cone axis 10 by a：Cone axis 10 structure includes 3 sections, and centre is cone axis first paragraph 17, is chi
Very little value Φ 63（+0.021 +0.002）The cylinder of mm, for installing bearing 7；It is cone axis second segment 18 on the left of cone axis first paragraph 17,
It is 1:The outer cone of 20 tapers, the diameter value at the big end of circular cone is equal with the size value of cone axis first paragraph 17, with cone axis first
Section 17 is smoothly connected；On the right side of cone axis first paragraph 17 it is cone axis the 3rd section 19, be 1:The outer cone of 20 tapers, the big end of circular cone
Diameter value is equal with the size value of cone axis first paragraph 17, is smoothly connected with cone axis first paragraph 17；Cone axis 10 adopts 45# steel
Modifier treatment is it is ensured that HB241-286；
B designs the first annulus 12：The outside diameter value of the first annulus 12 is Φ 140mm, and center is 1:The inner cone of 20 tapers
Hole, size value is matched with tapered sleeve male cone (strobilus masculinus) 20；The thickness value of the first annulus 12 is equal with the thickness value of framework the first plate 9, the
The cylindrical groove all processing 10 × 45 ° in thickness direction both sides of one annulus 12, for welding；
C increases tapered sleeve 11 part：The inside and outside of tapered sleeve 11 is 1:20 conical shape, tapered sleeve internal taper hole 21 and cone axis the
Two-stage nitration 18 coordinates, and tapered sleeve male cone (strobilus masculinus) 20 is coordinated with the first annulus internal taper hole 22, and tapered sleeve 11 adopts cast copper material；
D designs the second annulus 16：The outside diameter value of the second annulus 16 is Φ 140mm, and center is Φ 73（+0.03 0）
Cylindrical hole；The thickness value of the second annulus 16 is equal with the thickness value of framework the second plate 2, the second annulus 16 cylindrical in thickness side
All process 10 × 45 ° of groove to both sides, for welding, uniform 6 M16 screws 23 on the second annulus 16, for installing
Second bolt 14；
E increases transparent cover 13 part：The diameter value of transparent cover seam 28 is Φ 73mm（-0.03 -0.049）, transparent cover seam 28 is radially
Process 4 uniform tensioner grooves 26, make the transparent cover seam 28 can be with the endoporus tensioner of the second annulus 16；The center of transparent cover 13 is
Taper is 1:20 transparent cover internal taper hole 27, with the 3rd section 19 of outer conical surface cooperation of cone axis；The end face of transparent cover 13 processes 6
Uniform Φ 18mm via 24；The end face of transparent cover 13 processes 2 uniform dismounting screws 25, for dismantling transparent cover 13.
The improved implementation of II pressure cylinder fixing device：
It comprises the steps：
A, in production scene, is rule in the center of framework the first plate 9 and cuts out Φ 140mm circular hole；
B, in production scene, is rule in the center of framework the second plate 2 and cuts out Φ 140mm circular hole；
Tapered sleeve 11 is installed to cone axis second segment 18 by c, makes the male cone (strobilus masculinus) of tapered sleeve internal taper hole 21 and cone axis second segment 18
Match；First annulus 12 is inserted in tapered sleeve 11, so that the first annulus internal taper hole 22 is matched with tapered sleeve male cone (strobilus masculinus) 20；By transparent cover 13
It is installed to cone axis the 3rd section 19, so that the male cone (strobilus masculinus) of the 3rd section 19 of transparent cover internal taper hole 27 and cone axis is matched；By above-mentioned assembling
Body integrally penetrates in framework first plate and framework second plate, so that the thickness direction of the first annulus 12 is alignd with framework the first plate 9, will
Second annulus 16 is installed to the cylindrical position of the transparent cover seam 28 of this assembly, the axial location of adjustment the second annulus 16, makes the
The thickness direction of two annulus 16 is alignd with framework the second plate 2；
D by the first annulus 12 and framework the first plate 9 spot welding, by the second annulus 16 and framework the second plate 2 spot welding；
E installs spring washer 15 and the second bolt 14, the position of each part of adjustment it is ensured that the relativeness of each part all just
Really；
F is welded at each groove；
G will be smooth for each weld grinding；
H carries out shaking Ageing Treatment, eliminates welding stress；
I dismantles the second bolt 14, spring washer 15, takes out transparent cover 13, cone axis 10, tapered sleeve 11.
The improved enforcement of pressure cylinder structure of seat completes.
Claims (8)
1. a kind of large-scale sharpening machine pressure cylinder fixing device, including axle, axle two ends connection framework first plate and framework second respectively
Plate, framework first plate and framework second plate are fixed on column, and the top of pressure cylinder is arranged on framework first plate and the frame of main frame
Between frame second plate it is characterised in that：Described axle is cone axis, is cone axis first paragraph in the middle part of axle, and this section is column structure, axle
Left end is cone axis second segment, and axle right-hand member is the 3rd section of cone axis, and the taper of cone axis second segment and the 3rd section of cone axis is 1：
20, it is provided with tapered sleeve outside cone axis second segment, the interior external taper of this tapered sleeve is 1：20, it is the first annulus outside tapered sleeve, first
Annulus is nested in framework first plate, is provided with the second annulus in the 3rd section of outside of cone axis, the second annulus is nested in framework second
In plate, the right side that the 3rd section of cone axis is provided with transparent cover, and transparent cover left end is seam, and transparent cover center is provided with taper hole, transparent cover internal taper hole with
The 3rd section of cooperation of cone axis, transparent cover seam is contacted with the second annulus, and the second annulus end face is provided with screw, on the end face of transparent cover
It is provided with via and dismounting screw.
2. large-scale sharpening machine pressure cylinder fixing device according to claim 1 it is characterised in that：Inside described first annulus
For conical bore, tapered sleeve passes through from this hole.
3. large-scale sharpening machine pressure cylinder fixing device according to claim 1 it is characterised in that：Inside described second annulus
For cylindrical hole, transparent cover seam passes through from this hole.
4. large-scale sharpening machine pressure cylinder fixing device according to claim 1 it is characterised in that：Described first annulus and
Two annulus are annular slab, and all there is chamfering structure the edge of the both ends of the surface of annular slab.
5. large-scale sharpening machine pressure cylinder fixing device according to claim 1 it is characterised in that：Described transparent cover center interior
Taper hole is 1:20 tapers, transparent cover seam is radially even to be provided with four tensioner grooves.
6. large-scale sharpening machine pressure cylinder fixing device according to claim 1 it is characterised in that：In described transparent cover radially
Two dismounting screws of distribution, bolt through this dismounting screw, transparent cover is fixed on framework second plate.
7. large-scale sharpening machine pressure cylinder fixing device according to claim 1 it is characterised in that：Uniformly divide in described transparent cover
Six vias of cloth, the second bolt passes through via, and transparent cover is fixed on the second annulus.
8. the manufacture method of the large-scale sharpening machine pressure cylinder fixing device described in a kind of any one of claim 1 ~ 7, its feature exists
In：Comprise the following steps：
（1）Cut out Φ 140mm circular hole in the center of framework first plate, cut out Φ in the center of framework second plate
140mm circular hole；
（2）Process the first annulus, make the thickness value of the first annulus equal with the thickness value of framework first plate, the external diameter of the first annulus
It is worth for Φ 140mm, the taper of the first annulus internal taper hole is 1:20, size value is matched with tapered sleeve male cone (strobilus masculinus)；First annulus both sides
Cylindrical all process 10 × 45 grooves；
（3）Process the second annulus, make the thickness value of the second annulus equal with the thickness value of framework second plate, the external diameter of the second annulus
It is worth for Φ 140mm, the diameter of bore of the second annulus is Φ 73mm, and the second annulus both sides are cylindrical all to process 10 × 45 grooves；
（4）Tapered sleeve is installed to cone axis second segment, the first annulus internal taper hole is inserted in tapered sleeve male cone (strobilus masculinus), transparent cover is installed to circle
In the axis of cone, so that transparent cover internal taper hole is matched for the 3rd section with cone axis, the above-mentioned cone axis assembly assembling integrally is penetrated frame
In frame first plate and framework second plate, so that the thickness direction of the first annulus is alignd with framework first plate, the second annulus is installed to
The cylindrical position of the transparent cover seam of this assembly, the axial location of adjustment the second annulus, make thickness direction and the frame of the second annulus
Frame second plate aligns；
（5）By the first annulus and framework the first plate spot welding, by the second annulus and framework the second plate spot welding, spring washer and the are installed
Two bolts, the position adjusting each part, it is ensured that the relativeness of each part is all correct, is welded, by each weldering at each groove
Seam polishes smooth；Carry out shaking Ageing Treatment, eliminate welding stress；
（6）Dismantle the second bolt, spring washer, take out transparent cover, cone axis, tapered sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510107208.8A CN104723211B (en) | 2015-03-12 | 2015-03-12 | A kind of large-scale sharpening machine pressure cylinder fixing device and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510107208.8A CN104723211B (en) | 2015-03-12 | 2015-03-12 | A kind of large-scale sharpening machine pressure cylinder fixing device and preparation method thereof |
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| CN104723211A CN104723211A (en) | 2015-06-24 |
| CN104723211B true CN104723211B (en) | 2017-03-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS604621A (en) * | 1983-06-21 | 1985-01-11 | Yoshitsuka Seiki:Kk | Spindle supporting apparatus |
| JP2005342878A (en) * | 2004-06-07 | 2005-12-15 | Nagashima Seiko Kk | Grinding wheel spindle using air bearing |
| CN201209179Y (en) * | 2008-05-10 | 2009-03-18 | 李文军 | Taper drawing belt roller bearing binder |
| CN102581724B (en) * | 2012-02-29 | 2015-10-28 | 博罗县精汇电子科技有限公司 | The fixed mechanism of brush roller of circuit board grinding machine |
| CN203228108U (en) * | 2012-12-29 | 2013-10-09 | 广州市昊志机电股份有限公司 | Shaft core assembly with grinding wheels arranged on both ends |
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