CN109129052A - A kind of grinder for valve cone - Google Patents
A kind of grinder for valve cone Download PDFInfo
- Publication number
- CN109129052A CN109129052A CN201811219141.7A CN201811219141A CN109129052A CN 109129052 A CN109129052 A CN 109129052A CN 201811219141 A CN201811219141 A CN 201811219141A CN 109129052 A CN109129052 A CN 109129052A
- Authority
- CN
- China
- Prior art keywords
- fixedly connected
- valve
- rotating box
- grinder
- fixed
- 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.)
- Granted
Links
- 230000000694 effects Effects 0.000 claims abstract description 20
- 239000007787 solid Substances 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 claims 1
- 238000005498 polishing Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/14—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding conical surfaces, e.g. of centres
-
- 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
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
-
- 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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
-
- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/35—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The present invention relates to cone face grinder technical fields, and disclose a kind of grinder for valve cone, including fixed case, left side inside the fixed case is fixedly connected with servo motor, upper and lower surfaces inside the fixed case are fixedly connected to fixed block, the fixed block is fixedly connected with support ring far from the one side of fixed case, and the inner wall of the support ring is connected with rotating box, and the left side of the rotating box is fixedly connected with the output shaft of servo motor.The grinder for valve cone, by being provided with vertical bar, clamping bar, the first cylinder and adjustable spring, so that clamping bar grips valve left end under the collective effect of the first cylinder and adjustable spring, also by being provided with loose collar, fixed ring, connecting rod and gripping block, second cylinder drives loose collar rotation, to drive gripping block to be clamped fixation to valve middle part surface by connecting rod, so that valve will not shift when carrying out conical surface polishing.
Description
Technical field
The present invention relates to cone face grinder technical field, specially a kind of grinder for valve cone.
Background technique
The effect of valve is to be responsible for input air and the exhaust gas being discharged after burning into engine specially.From engine structure
On, it is divided into intake and exhaust valves.The effect of inlet valve is drawn air into engine, is mixed and burned with fuel;Exhaust valve
Effect be that the exhaust gas after burning is discharged and radiates.Grinder for valve cone is the special purpose grinder of valve high-efficiency high-accuracy processing.
Grinder for valve cone is controlled using digital control system, AC servo machinery driving, can accurately control grinding wheel feeding grinding, work
Make platform quickly to swing.With automatic crushing compensation function.Existing overwhelming majority grinder for valve cone is all by by gas
Door is inserted directly into fixed block, and motor drives fixed block rotation, so that sanding block polishes to the conical surface of valve, directly
The valve of insertion stress when being polished may generate offset, cause valve polishing inaccuracy, result in waste of resources.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of grinder for valve cone, solve grinder for valve cone and are carrying out
The problem of valve is not fixed when polishing, is easy to happen offset.
(2) technical solution
To achieve the above object, the invention provides the following technical scheme: a kind of grinder for valve cone, including fixed case, it is described solid
Determine the left side inside case and be fixedly connected with servo motor, the upper and lower surfaces inside the fixed case are fixedly connected to
Fixed block, the fixed block are fixedly connected with support ring far from the one side of fixed case, and the inner wall of the support ring is flexibly connected
There is rotating box, the left side of the rotating box is fixedly connected with the output shaft of servo motor, the middle part of the fixed case right side
The first jack is offered, the second jack is offered in the middle part of the rotating box right side, the internal activity of first jack connects
It is connected to valve, the left end of the valve runs through the inside of the second jack and extends to the inside of rotating box, inside the rotating box
Upper and lower surfaces be fixedly connected respectively with the both ends of vertical bar, clamping bar is connected in the middle part of the vertical bar, it is described
Surface inside rotating box is fixedly connected with the first cylinder, the output end and the surface activity in the middle part of clamping bar of first cylinder
The surface activity of connection, surface and valve of the clamping bar far from vertical bar one end connects, and the surface inside the rotating box is solid
Surely it is connected with support rod, the support rod is fixedly connected with fixed ring far from one end of rotating box, the table inside the rotating box
Face offers rotation slot, and the internal activity of the rotation slot is connected with rotating block, one side of the rotating block far from rotation slot
It is fixedly connected with loose collar, the back side inside the rotating box is fixedly connected with placement plate, and the lower surface of the placement plate is fixed
It is connected with the second cylinder, the output end of second cylinder is connected with catch bar, the front of the catch bar and loose collar
Surface be fixedly connected, the right side of the loose collar is fixedly connected with hinged seat, and the surface of the hinged seat is hinged with connection
Bar, the connecting rod are connected with movable block far from one end of hinged seat, and the right side of the fixed ring is fixedly connected with circle
Bar, the surface of the round bar are flexibly connected with one end of movable block, and the movable block is fixedly connected with far from one end of connecting rod
Gripping block.
Preferably, the inside of first jack and the second jack is connected with the inside of fixed case and rotating box respectively,
And first jack size and the second jack it is equal in magnitude.
Preferably, the quantity of first cylinder and clamping bar is two, and the opposite face in the middle part of two clamping bars point
It is not fixedly connected with the both ends of adjustable spring.
Preferably, the connecting rod is curved rod, and the quantity of connecting rod is three, and three connecting rods are equidistant
The surface of loose collar is set.
Preferably, one side of the gripping block far from movable block is arc, and the table of the arcwall face of gripping block and valve
Face radian is consistent.
Preferably, the median vertical line of the median vertical line and rotating box of the support ring is located at same straight line.
(3) beneficial effect
Compared with prior art, the present invention provides a kind of grinder for valve cone, have it is following the utility model has the advantages that
1, grinder for valve cone, by being provided with vertical bar, clamping bar, the first cylinder and adjustable spring, so that clamping bar is the
Valve left end is gripped under the collective effect of one cylinder and adjustable spring, also by be provided with loose collar, fixed ring,
Connecting rod and gripping block, the second cylinder drives loose collar rotation, to drive gripping block to valve middle part surface by connecting rod
It is clamped fixation, so that valve will not shift when carrying out conical surface polishing.
2, the grinder for valve cone is supported rotating box by being provided with servo motor, fixed block and support ring
It does not influence servo motor simultaneously and drives rotating box rotation, also by being provided with rotation slot, rotating block, the second cylinder and catch bar,
Allow the second cylinder to drive the firm rotation of swivel becket, will not shift.
Detailed description of the invention
Fig. 1 is structure of the invention front elevational view;
Fig. 2 is swivel becket structure sectional side view of the present invention;
Fig. 3 is schematic enlarged-scale view at A in Fig. 2 of the present invention.
In figure: 1 fixed case, 2 servo motors, 3 fixed blocks, 4 support rings, 5 rotating box, 6 first jacks, 7 second jacks, 8
Valve, 9 vertical bars, 10 clamping bars, 11 first cylinders, 12 adjustable springs, 13 support rods, 14 fixed rings, 15 rotation slots, 16 rotations
Block, 17 loose collars, 18 placement plates, 19 second cylinders, 20 catch bars, 21 hinged seats, 22 connecting rods, 23 movable blocks, 24 round bars, 25
Gripping block.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-3, a kind of grinder for valve cone, including fixed case 1 are please referred to, the left side inside fixed case 1 is fixedly connected
There is servo motor 2, the upper and lower surfaces inside fixed case 1 are fixedly connected to fixed block 3, and fixed block 3 is far from fixed case 1
One side be fixedly connected with support ring 4, the inner wall of support ring 4 is connected with rotating box 5, the median vertical line of support ring 4 with
The median vertical line of rotating box 5 is located at same straight line, so that support ring 4 is more firm to the support of rotating box 5, rotating box 5 is turning
Will not shift when dynamic, the left side of rotating box 5 is fixedly connected with the output shaft of servo motor 2, be provided with servo motor 2,
Fixed block 3 and support ring 4 do not influence servo motor 2 and rotating box 5 are driven to rotate while being supported on rotating box 5, fixed case
The first jack 6 is offered in the middle part of 1 right side, and the second jack 7, the first jack 6 and are offered in the middle part of 5 right side of rotating box
The inside of two jacks 7 is connected with the inside of fixed case 1 and rotating box 5 respectively, and the size of the first jack 6 and the second jack 7
It is equal in magnitude, allow valve 8 to pass sequentially through the inside of the first jack 6 and the second jack 7, it is convenient that valve 8 is pressed from both sides
It fastens, the internal activity of the first jack 6 is connected with valve 8, and the left end of valve 8 is run through the inside of the second jack 7 and extended to
The inside of rotating box 5, the upper and lower surfaces inside rotating box 5 are fixedly connected with the both ends of vertical bar 9 respectively, in vertical bar 9
Portion is connected with clamping bar 10, and the surface inside rotating box 5 is fixedly connected with the first cylinder 11, the first cylinder 11 and clamping bar
10 quantity is two, and the opposite face at two 10 middle parts of clamping bar is fixedly connected with the both ends of adjustable spring 12 respectively, is stretched
Contracting spring 12 moves inward two 10 stress of clamping bar, to clamp to 8 surface of valve, the output of the first cylinder 11
It holds and is connect with the surface activity at 10 middle part of clamping bar, the surface activity of surface of the clamping bar 10 far from 9 one end of vertical bar and valve 8 connects
It connects, is provided with vertical bar 9, clamping bar 10, the first cylinder 11 and adjustable spring 12, so that clamping bar 10 is in the first cylinder 11 and stretches
8 left end of valve is gripped under the collective effect of spring 12, the surface inside rotating box 5 is fixedly connected with support rod
13, support rod 13 is fixedly connected with fixed ring 14 far from one end of rotating box 5, and the surface inside rotating box 5 offers rotation slot
15, the internal activity of rotation slot 15 is connected with rotating block 16, and rotating block 16 is fixedly connected with work far from the one side of rotation slot 15
Rotating ring 17, the back side inside rotating box 5 are fixedly connected with placement plate 18, and the lower surface of placement plate 18 is fixedly connected with the second cylinder
19, the output end of the second cylinder 19 is connected with catch bar 20, the fixed company in the front of catch bar 20 and the surface of loose collar 17
It connects, is provided with rotation slot 15, rotating block 16, the second cylinder 19 and catch bar 20, the second cylinder 19 is allowed to drive swivel becket
17 firm rotations, will not shift, the right side of loose collar 17 is fixedly connected with hinged seat 21, and the surface of hinged seat 21 is hinged
There is connecting rod 22, connecting rod 22 is curved rod, and the quantity of connecting rod 22 is three, and the equidistant setting of three connecting rods 22 exists
The surface of loose collar 17, three connecting rods 22 drive three movable blocks 23 to rotate, to drive three gripping blocks 25 to valve 8
Surface is clamped fixation, and fixed is stronger, and connecting rod 22 is connected with movable block 23 far from one end of hinged seat 21, Gu
The right side for determining ring 14 is fixedly connected with round bar 24, and the surface of round bar 24 is flexibly connected with one end of movable block 23, movable block 23
One end far from connecting rod 22 is fixedly connected with gripping block 25, is provided with loose collar 17, fixed ring 14, connecting rod 22 and gripping block
25, the second cylinder 19 drives loose collar 17 to rotate, to drive gripping block 25 to carry out 8 middle part surface of valve by connecting rod 22
It is fixedly clamped, so that valve 8 will not shift when carrying out conical surface polishing, gripping block 25 is far from movable block 23
One side is arc, and the arcwall face of gripping block 25 is consistent with the surface radian of valve 8 so that gripping block 25 and 8 surface of valve
Fit so that gripping block 25 to the stress of valve 8 more evenly.
The electric elements occurred in this article are electrically connected with extraneous main controller and 220V alternating current, and main controller can be meter
Calculation machine etc. plays the conventionally known equipment of control.
When in use, valve 8 is sequentially passed through into the first jack 6 and the second jack 7 and extends to the left side inside rotating box 5
End starts the first cylinder 11, and the first cylinder 11 drives the right end of clamping bar 10 to rotate down, and is clamped to 8 surface of valve solid
It is fixed, start the second cylinder 19, the second cylinder 19 is shunk upwards drives catch bar 20 to move up, to drive loose collar 17 reversed
Rotation, loose collar 17 drives movable block 23 around 24 surface pivots of round bar by connecting rod 22, to drive 25 pairs of gas of gripping block
Door 8 is clamped fixation, starts servo motor 2, and servo motor 2 drives rotating box 5 to rotate, to drive the rotation processing of valve 8.
In conclusion the grinder for valve cone, by being provided with vertical bar 9, clamping bar 10, the first cylinder 11 and adjustable spring
12, so that clamping bar 10 grips 8 left end of valve under the collective effect of the first cylinder 11 and adjustable spring 12, also
By being provided with loose collar 17, fixed ring 14, connecting rod 22 and gripping block 25, the second cylinder 19 drives loose collar 17 to rotate, from
And drive gripping block 25 to be clamped fixation to 8 middle part surface of valve by connecting rod 22, so that valve 8 is carrying out the conical surface
It will not shift when polishing, solve grinder for valve cone valve 8 when being polished and do not fix, be easy hair
The problem of raw offset.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of grinder for valve cone, including fixed case (1), it is characterised in that: the internal left side of the fixed case (1) is fixed
It is connected with servo motor (2), the internal upper and lower surfaces of the fixed case (1) are fixedly connected to fixed block (3), described
Fixed block (3) is fixedly connected with support ring (4) far from the one side of fixed case (1), and the inner wall of the support ring (4) is flexibly connected
Have rotating box (5), the left side of the rotating box (5) is fixedly connected with the output shaft of servo motor (2), the fixed case (1)
It offers in the middle part of right side the first jack (6), is offered the second jack (7) in the middle part of rotating box (5) right side, it is described
The internal activity of first jack (6) is connected with valve (8), and the left end of the valve (8) is run through the inside of the second jack (7) and prolonged
The inside of rotating box (5) is extended to, both ends of the internal upper and lower surfaces of the rotating box (5) respectively with vertical bar (9) are fixed
It connects, is connected with clamping bar (10) in the middle part of the vertical bar (9), the internal surface of the rotating box (5) is fixedly connected with
The output end of first cylinder (11), first cylinder (11) is connect with the surface activity in the middle part of clamping bar (10), the clamping
Bar (10) is connect far from the surface of vertical bar (9) one end with the surface activity of valve (8), and the internal surface of the rotating box (5) is solid
Surely it is connected with support rod (13), the support rod (13) is fixedly connected with fixed ring (14) far from the one end of rotating box (5), described
The internal surface of rotating box (5) offers rotation slot (15), and the internal activity of the rotation slot (15) is connected with rotating block (16),
The rotating block (16) is fixedly connected with loose collar (17) far from the one side of rotation slot (15), rotating box (5) inside
The back side is fixedly connected with placement plate (18), and the lower surface of the placement plate (18) is fixedly connected with the second cylinder (19), and described
The output end of two cylinders (19) is connected with catch bar (20), the surface in the front and loose collar (17) of the catch bar (20)
It is fixedly connected, the right side of the loose collar (17) is fixedly connected with hinged seat (21), and the surface of the hinged seat (21) is hinged
Have connecting rod (22), the connecting rod (22) is connected with movable block (23), the fixation far from the one end of hinged seat (21)
The right side of ring (14) is fixedly connected with round bar (24), and one end activity on the surface and movable block (23) of the round bar (24) connects
It connects, the movable block (23) is fixedly connected with gripping block (25) far from the one end of connecting rod (22).
2. a kind of grinder for valve cone according to claim 1, it is characterised in that: first jack (6) and second is inserted
The inside in hole (7) is connected with the inside of fixed case (1) and rotating box (5) respectively, and the size of the first jack (6) is inserted with second
Hole (7) it is equal in magnitude.
3. a kind of grinder for valve cone according to claim 1, it is characterised in that: first cylinder (11) and clamping bar
(10) quantity is two, and the opposite face in the middle part of two clamping bars (10) is fixed with the both ends of adjustable spring (12) connect respectively
It connects.
4. a kind of grinder for valve cone according to claim 1, it is characterised in that: the connecting rod (22) is curved rod,
And the quantity of connecting rod (22) is three, surface of three equidistant settings of connecting rod (22) in loose collar (17).
5. a kind of grinder for valve cone according to claim 1, it is characterised in that: the gripping block (25) is far from movable block
(23) one side is arc, and the arcwall face of gripping block (25) is consistent with the surface radian of valve (8).
6. a kind of grinder for valve cone according to claim 1, it is characterised in that: the median vertical line of the support ring (4)
It is located at same straight line with the median vertical line of rotating box (5).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201811219141.7A CN109129052B (en) | 2018-10-19 | 2018-10-19 | Valve conical surface grinding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201811219141.7A CN109129052B (en) | 2018-10-19 | 2018-10-19 | Valve conical surface grinding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
CN109129052A true CN109129052A (en) | 2019-01-04 |
CN109129052B CN109129052B (en) | 2024-06-14 |
Family
ID=64808734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201811219141.7A Active CN109129052B (en) | 2018-10-19 | 2018-10-19 | Valve conical surface grinding machine |
Country Status (1)
Country | Link |
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CN (1) | CN109129052B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110802469A (en) * | 2019-11-05 | 2020-02-18 | 山东高强紧固件有限公司 | Metal bolt surface grinding device |
CN111390674A (en) * | 2020-03-02 | 2020-07-10 | 江西理工大学 | A floating grinding head mechanism |
CN116900834A (en) * | 2023-09-04 | 2023-10-20 | 唐山友缘科技有限公司 | Self-positioning type coupling polishing device with rotation centering function |
CN118635983A (en) * | 2024-07-02 | 2024-09-13 | 大连日川精密模具部品有限公司 | A mold parts grinding device |
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CN207942276U (en) * | 2017-12-28 | 2018-10-09 | 重庆长松科技发展有限公司 | A kind of automobile gadget special grinding apparatus |
CN209062696U (en) * | 2018-10-19 | 2019-07-05 | 镇江维纳特气门有限公司 | A kind of grinder for valve cone |
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EP1579955A1 (en) * | 2004-03-25 | 2005-09-28 | WENDT GmbH | Ram clamping device |
JP2012101329A (en) * | 2010-11-11 | 2012-05-31 | Honda Motor Co Ltd | Workpiece grinding device, workpiece grinding method, engine valve grinding device, and engine valve grinding method |
CN202556224U (en) * | 2012-05-18 | 2012-11-28 | 机械工业第三设计研究院 | Chuck for grinding air valve |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110802469A (en) * | 2019-11-05 | 2020-02-18 | 山东高强紧固件有限公司 | Metal bolt surface grinding device |
CN110802469B (en) * | 2019-11-05 | 2020-08-07 | 山东高强紧固件有限公司 | Metal bolt surface grinding device |
CN111390674A (en) * | 2020-03-02 | 2020-07-10 | 江西理工大学 | A floating grinding head mechanism |
CN116900834A (en) * | 2023-09-04 | 2023-10-20 | 唐山友缘科技有限公司 | Self-positioning type coupling polishing device with rotation centering function |
CN116900834B (en) * | 2023-09-04 | 2024-04-05 | 唐山友缘科技有限公司 | Self-positioning type coupling polishing device with rotation centering function |
CN118635983A (en) * | 2024-07-02 | 2024-09-13 | 大连日川精密模具部品有限公司 | A mold parts grinding device |
Also Published As
Publication number | Publication date |
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CN109129052B (en) | 2024-06-14 |
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