CN108481186A - A kind of valve seat grinding compressing fixture of adjustable positive pressure - Google Patents
A kind of valve seat grinding compressing fixture of adjustable positive pressure Download PDFInfo
- Publication number
- CN108481186A CN108481186A CN201810572667.7A CN201810572667A CN108481186A CN 108481186 A CN108481186 A CN 108481186A CN 201810572667 A CN201810572667 A CN 201810572667A CN 108481186 A CN108481186 A CN 108481186A
- Authority
- CN
- China
- Prior art keywords
- valve seat
- positive pressure
- mounting plate
- installation board
- lower installation
- 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.)
- Pending
Links
- 238000000227 grinding Methods 0.000 title description 16
- 238000009434 installation Methods 0.000 claims abstract description 46
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 11
- 210000005069 ears Anatomy 0.000 claims description 4
- 238000003801 milling Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005483 Hooke's law Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
- 238000007789 sealing Methods 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
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/27—Work carriers
-
- 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
- B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
- B24B15/04—Machines or devices designed for grinding seat surfaces; Accessories therefor on valve members
-
- 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
- B24B37/00—Lapping machines or devices; Accessories
Abstract
The invention discloses a kind of valve seats of adjustable positive pressure to grind compressing fixture, it is related to milling apparatus field, solve the problems, such as that available man-power pressing dynamics control is inaccurate, it includes upper mounting plate and lower installation board disposed in parallel, clamp system for clamping valve seat is installed below the lower installation board, the upper mounting plate corresponds to the runner disk that is equipped with and can lift in an axial direction at the position of clamp system, is equipped between the runner disk and clamp system and contradicts the two and the elastic component one across the lower installation board respectively.The present invention has precision high, and stability is good, advantage high in machining efficiency.
Description
Technical field
The present invention relates to milling apparatus fields, and in particular to a kind of valve seat grinding compressing fixture of adjustable positive pressure.
Background technology
Air-tightness is the key index of pump valve reliability, in order to make pump valve in off position when can ensure that its excellent sealing
Performance needs to be ground process to each spool and corresponding valve seat in pump valve process of manufacture, reduce because
There are gaps when spool coordinates with valve seat caused by the mismachining tolerance of surface, by making spool coordinate more with valve seat after grinding technics
Step up close, reaches the air-tightness requirement of spool and valve seat.During carrying out the milled processed of spool and valve seat, need to spool
One positive pressure of contact surface between valve seat, positive pressure too conference scratches contact surface, on the contrary then grinding is not achieved and connects
Touch the effect on surface.
In pump valve enterprise production line, spool and valve seat grinding technics are by the way that spool to be fixed on to the workbench rotated automatically
On, lapping liquid is coated in the abradant surface of valve seat, holding valve seat by worker is pressed on the spool face of rotation, into line number point
The grinding operation of clock.Human arm can not accurately control the grinding pressure for being applied to spool and valve seat contact surface, cause final
Grinding effect is poor, and the pump valve air-tightness produced does not reach requirement, and hand-held valve seat be pressed on the spool of rotation there is
Prodigious production safety hidden danger.
Invention content
In order to overcome the shortcomings of that background technology, the present invention provide a kind of adjustable positive pressure that accuracy is high, easy to operate
Valve seat grind compressing fixture.
The technical solution adopted in the present invention：A kind of valve seat grinding compressing fixture of adjustable positive pressure comprising parallel
The upper mounting plate and lower installation board of setting are equipped with the clamp system for clamping valve seat below the lower installation board, described
Upper mounting plate corresponds to the runner disk that is equipped with and can lift in an axial direction at the position of clamp system, the runner disk and clamp system it
Between be equipped with respectively contradict both and across the lower installation board elastic component one.
The runner disk is equipped with to the one side of upper mounting plate with the upper mounting plate screw-thread fit and across upper mounting plate
Screw rod.
The screw tip is equipped with the indicator being rotatably assorted with it, and the screw rod both sides are equipped with and are fixedly mounted on described
Graduated scale on mounting plate, the indicator both ends offer the groove for avoiding the graduated scale.
Several studs for being mounted on periphery are equipped between the upper mounting plate and lower installation board, the stud is close to upper peace
One end of loading board is equipped with the double nut for being clamped in upper mounting plate both sides.
The medium position of the stud is equipped with stop nut, is equipped between the stop nut and lower installation board and supports respectively
Touch the elastic component three of the two.
The clamp system includes the pedestal and clamping seats being connect with the lower installation board, and the clamping seats and pedestal can
Dismounting installation, be equipped on the clamping seats with its coordinate after the movable semi-ring of valve seat excircle is clamped.
The clamping seats are equipped with semi-circular boss, and described activity semi-ring one end and one end of the semi-circular boss are hingedly pacified
The other end of dress, the other end and the semi-circular boss of the activity semi-ring is bolted.
Stove bolt across the lower installation board is installed on the pedestal, is equipped between the stove bolt and lower installation board
Contradict the elastic component two of the two.
Cushion pad is equipped between the pedestal and lower installation board.
The lower installation board both sides are equipped with handle, and the side of the upper mounting plate is equipped with several mounting ears.
The beneficial effects of the invention are as follows：By the structure of this programme, rotating wheel disk, screw rod drives runner disk to transport up and down
Dynamic, runner disk compression elastic piece one when moving downward applies a positive pressure by clamp system to valve seat, and screw rod is another
The indicator and graduated scale at end show current pressure value, ensure the accuracy and stability of pressure applied, improve valve seat
The grinding qualification rate of spool improves processing efficiency.
Description of the drawings
Fig. 1 is that the valve seat of the adjustable positive pressure of the embodiment of the present invention grinds the structural schematic diagram of compressing fixture.
Fig. 2 is that the valve seat of the adjustable positive pressure of the embodiment of the present invention grinds the fractionation structural representation of compressing fixture.
Fig. 3 is that the valve seat of the adjustable positive pressure of the embodiment of the present invention grinds the front view of compressing fixture.
Specific implementation mode
Embodiments of the present invention is further illustrated below in conjunction with the accompanying drawings：
As shown, a kind of valve seat of adjustable positive pressure grinds compressing fixture comprising upper mounting plate 1 disposed in parallel is under
Mounting plate 2, the lower section of the lower installation board 2 are equipped with the clamp system 3 for clamping valve seat, and the upper mounting plate 1 corresponds to folder
The runner disk 4 that can be lifted in an axial direction is installed at the position of tight mechanism 3, difference is equipped between the runner disk 4 and clamp system 3
The two and the elastic component 1 across the lower installation board 2 are contradicted, the one side of the runner disk 4 towards upper mounting plate 1 is equipped with and institute
1 screw-thread fit of upper mounting plate and the screw rod 6 across upper mounting plate 1 are stated, the structure of this programme, rotating wheel disk, screw rod band are passed through
Turn wheel disc moves up and down, runner disk compression elastic piece one when moving downward, and applies a forward direction to valve seat by clamp system
Pressure, and the indicator and graduated scale of the screw rod other end show current pressure value, ensure pressure applied accuracy and
Stability improves the grinding qualification rate of valve seat spool, improves processing efficiency.
6 top of the screw rod is equipped with the indicator 61 being rotatably assorted with it, and 6 both sides of the screw rod are equipped with and are fixedly mounted on institute
The graduated scale 7 on upper mounting plate 1 is stated, 61 both ends of the indicator offer the groove 62 for avoiding the graduated scale 7, the present embodiment
The indicator of use is only moved up and down by screw rod drive, and without rotating, graduated scale is arranged in parallel with screw rod, indicator
Signified position is the pressure value that current valve seat is subject to.
Several studs 8 for being mounted on periphery are equipped between the upper mounting plate 1 and lower installation board 2, the stud 8 is close
One end of upper mounting plate 1 is equipped with the double nut 81 for being clamped in 1 both sides of upper mounting plate, and double nut can be used for adjusting peace
The horizontality of loading board.
The clamp system 3 includes the pedestal 31 being connect with the lower installation board 2 and clamping seats 32, the clamping seats 32
Detachably installed with pedestal 31, be equipped on the clamping seats 32 with its coordinate after the movable semi-ring 33 of valve seat excircle is clamped,
The clamping seats 32 are equipped with semi-circular boss 34, and described activity 33 one end of semi-ring and one end of the semi-circular boss 34 are hingedly pacified
The other end of dress, the other end and the semi-circular boss 34 of the activity semi-ring 33 is bolted.
The medium position of the stud 8 is equipped with stop nut 82, is equipped between the stop nut 82 and lower installation board 2
The elastic component 3 83 of the two is contradicted respectively, and the stove bolt 9 across the lower installation board 2 is installed on the pedestal 31, it is described small
Between bolt 9 and lower installation board 2 be equipped with contradict both elastic component 2 10, after the completion of spool valve seat grind, holding handle to
On when lifting lower installation board, elastic component two and elastic component three also cushioning effect, after putting down this structure, elastic component two and elastic component
Three provide a restoring force, and lower installation board and pedestal is made to set back.
In addition, when elastic component one is applied to one pressure of pedestal, pedestal generates the gap of certain size with lower installation board,
The elastic component two being set on stove bolt will produce an opposite restoring force in direction, but because of valve seat valve in the present embodiment
Core is mutually ground, and the size in this gap is very small, and the restoring force of elastic component two can be ignored.
It is equipped with cushion pad 21 between the pedestal 31 and lower installation board 2, plays damping, extends pedestal and lower installation board
Service life.
2 both sides of the lower installation board are equipped with handle 22, and the side of the upper mounting plate 1 is equipped with several mounting ears 11, convenient
Installation.
Horizontal detection meter 12, the horizontal position for precisely holding clamping seats are additionally provided on the clamping seats.
The installation method of the present embodiment：Being in graduated scale " 0 " position in indicator, i.e. elastic component one does not have decrement,
Spool is fixed on the spool grinding table of rotation, matched valve seat is put on spool, clamping seats are installed on valve seat,
It detects whether this structure is in substantially vertical state with level meter, two fixed support ears of upper backup pad is then fixed with bolt
Piece, apparatus of the present invention install.For the valve seat of same model, this operation need not just be done again by installing；Process different shaped
Number valve seat, need replacing valve seat clamping seats, valve seat clamping seats and the fixed nut of pedestal bottom plate unclamped, new model is changed
Valve seat clamping seats, and corresponding spool height also changes, so needing to reinstall by previous step.
The workflow of the present embodiment：It is no more than yield limit, stiffness factor K and compression in spring distortional stress
Length x meets Hooke's law：F=K*x.According to Hooke's law formula, this structure by dialling the runner disk with screw rod manually, wherein
Screw rod coordinates with upper mounting plate for screw thread pair, by the translational motion that screw rod convert rotational motion is indicator vertical direction, instruction
Distance on the corresponding graduated scale of part is one compressed length of elastic component, and the stiffness factor K of elastic component one is it is known that so root
According to recklessly can law can calculate the positive pressure that elastic component one at this time is applied to impact faces, ground according to spool and the contact surface of valve seat
Positive pressure requirement needed for mill, rotating wheel disk make indicator point to corresponding scale, and clamping seats are bolted with pedestal
Together, so the positive pressure that elastic component one generates is transmitted on valve seat clamping seats, valve seat is fastened in valve seat clamping seats, in
It is that the constant positive pressure that elastic component one generates is transmitted on the contact surface of spool and valve seat.
After reaching valve seat milling time, rotary spool workbench is closed, manual rotation wheel disc discharges the pressure of elastic component one
It is pointed at scale " 0 " scale to vernier, is used to clamp the spiral shell of valve seat with allen wrench release activity semi-ring and semi-circular boss
Bolt, opening activity semi-ring, both hands hold handle and up put mounting plate vertically, and it is multiple that elastic component three generates buffer brake by compression
It prepares position.Three equally distributed stove bolts are connect across lower installation board with pedestal, by the elastic force of elastic component two by pedestal
It is pressed on lower installation board with cushion pad, when lower installation board up moves, elastic component two, which is deformed, to be resisted below stove bolt
The pedestal of connection, the gravity of valve seat clamping seats, up move together with pedestal, valve seat clamping seats, until valve seat is detached from valve seat
Clamping seats, remove valve seat from spool, and both hands unclamp handle, and elastic component three, which resets, compresses lower installation board, complete unilateral spool with
The grinding of valve seat；
Spool on grinding table is shifted into other side, lapping liquid is coated in the spool face to be ground, it is past to grasp handle
On lift lower installation board, then valve seat is placed on spool, unclamping handle makes valve seat enter in clamping seats, closes movable semi-ring,
With allen wrench clamping screw, make valve seat in clamping seats without relative rotation.Rotating wheel disk carries out above compress and operates, and one
A spool both sides grinding terminates, and replaces next group of spool and valve seat, moves in circles.
In the description of the present invention, it should be noted that term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or two
More than.
Every technical staff's notice：Although the present invention is described according to above-mentioned specific implementation mode, of the invention
Invention thought be not limited in the invention, any repacking with inventive concept will all be included in this patent protection of the patent right
In range.
Claims (10)
1. a kind of valve seat of adjustable positive pressure grinds compressing fixture, it is characterised in that：It includes upper mounting plate disposed in parallel
（1）And lower installation board（2）, the lower installation board（2）Lower section the clamp system for clamping valve seat is installed（3）, it is described on
Mounting plate（1）Corresponding clamp system（3）Position at the runner disk that can be lifted in an axial direction is installed（4）, the runner disk（4）With
Clamp system（3）Between be equipped with respectively contradict both and pass through the lower installation board（2）Elastic component one（5）.
2. the valve seat of adjustable positive pressure according to claim 1 grinds compressing fixture, it is characterised in that：The runner disk
（4）Towards upper mounting plate（1）One side be equipped with and the upper mounting plate（1）Screw-thread fit and pass through upper mounting plate（1）Screw rod
（6）.
3. the valve seat of adjustable positive pressure according to claim 2 grinds compressing fixture, it is characterised in that：The screw rod
（6）Top is equipped with the indicator being rotatably assorted with it（61）, the screw rod（6）Both sides are equipped with and are fixedly mounted on the upper mounting plate
（1）On graduated scale（7）, the indicator（61）Both ends offer the evacuation graduated scale（7）Groove（62）.
4. the valve seat of adjustable positive pressure according to claim 1 grinds compressing fixture, it is characterised in that：The upper installation
Plate（1）And lower installation board（2）Between be equipped with several be mounted on periphery studs（8）, the stud（8）Close to upper mounting plate
（1）One end be equipped with and be clamped in upper mounting plate（1）The double nut of both sides（81）.
5. the valve seat of adjustable positive pressure according to claim 4 grinds compressing fixture, it is characterised in that：The stud
（8）Medium position stop nut is installed（82）, the stop nut（82）With lower installation board（2）Between be equipped with contradict respectively
The elastic component three of the two（83）.
6. the valve seat of adjustable positive pressure according to claim 1 grinds compressing fixture, it is characterised in that：The clamping machine
Structure（3）Including with the lower installation board（2）The pedestal of connection（31）And clamping seats（32）, the clamping seats（32）And pedestal
（31）Detachable installation, the clamping seats（32）On be equipped with its coordinate after be clamped valve seat excircle movable semi-ring（33）.
7. the valve seat of adjustable positive pressure according to claim 6 grinds compressing fixture, it is characterised in that：The clamping seats
（32）Equipped with semi-circular boss（34）, the activity semi-ring（33）One end and the semi-circular boss（34）One end hingedly pacify
Dress, the activity semi-ring（33）The other end and the semi-circular boss（34）The other end be bolted.
8. the valve seat of adjustable positive pressure according to claim 6 grinds compressing fixture, it is characterised in that：The pedestal
（31）On be equipped with across the lower installation board（2）Stove bolt（9）, the stove bolt（9）With lower installation board（2）Between be equipped with
Contradict the elastic component two of the two（10）.
9. the valve seat of adjustable positive pressure according to claim 6 grinds compressing fixture, it is characterised in that：The pedestal
（31）With lower installation board（2）Between be equipped with cushion pad（21）.
10. the valve seat of adjustable positive pressure according to claim 6 grinds compressing fixture, it is characterised in that：The lower peace
Loading board（2）Both sides are equipped with handle（22）, the upper mounting plate（1）Side be equipped with several mounting ears（11）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810572667.7A CN108481186A (en) | 2018-06-06 | 2018-06-06 | A kind of valve seat grinding compressing fixture of adjustable positive pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810572667.7A CN108481186A (en) | 2018-06-06 | 2018-06-06 | A kind of valve seat grinding compressing fixture of adjustable positive pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108481186A true CN108481186A (en) | 2018-09-04 |
Family
ID=63342314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810572667.7A Pending CN108481186A (en) | 2018-06-06 | 2018-06-06 | A kind of valve seat grinding compressing fixture of adjustable positive pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108481186A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB821703A (en) * | 1956-08-14 | 1959-10-14 | Crane Packing Co | Improvements in or relating to lapping machines |
| GB847719A (en) * | 1958-05-21 | 1960-09-14 | Dewrance & Co | Improvements in lapping machines |
| CN101954610A (en) * | 2010-02-01 | 2011-01-26 | 杭州耐特阀门有限公司 | Sealing surface free-grinding repairing method of slurry valve |
| CN203156419U (en) * | 2013-03-28 | 2013-08-28 | 寿光宝隆石油器材有限公司 | Rotary tool for lathe |
| CN203221385U (en) * | 2013-05-09 | 2013-10-02 | 杨中海 | Crystal and glass triangular bar circulating grinding machine |
| CN104551976A (en) * | 2013-10-29 | 2015-04-29 | 上海上冶阀门制造有限公司 | Multifunctional self-adaption ball valve grinding miller |
| CN105729270A (en) * | 2016-02-29 | 2016-07-06 | 苏州纽威阀门股份有限公司 | Grinding mechanism for valve core and valve seat |
| CN107186574A (en) * | 2017-07-21 | 2017-09-22 | 迅达科技集团股份有限公司 | A kind of plug valve of gas stove grinder and its Ginding process |
| KR200485015Y1 (en) * | 2017-02-06 | 2017-11-20 | 유제수 | Lapping device for polishing seat suface of valve |
| CN206825014U (en) * | 2017-05-05 | 2018-01-02 | 无锡先导智能装备股份有限公司 | Clamping device |
| CN107571143A (en) * | 2017-09-22 | 2018-01-12 | 云南冶金新立钛业有限公司 | The lapping device of air valve seat |
| CN107627198A (en) * | 2017-08-30 | 2018-01-26 | 重庆市永川区泰兴机械厂 | Sanding apparatus for boat diesel engine |
| CN208262567U (en) * | 2018-06-06 | 2018-12-21 | 温州大学 | A kind of valve seat grinding compressing fixture of adjustable positive pressure |
-
2018
- 2018-06-06 CN CN201810572667.7A patent/CN108481186A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB821703A (en) * | 1956-08-14 | 1959-10-14 | Crane Packing Co | Improvements in or relating to lapping machines |
| GB847719A (en) * | 1958-05-21 | 1960-09-14 | Dewrance & Co | Improvements in lapping machines |
| CN101954610A (en) * | 2010-02-01 | 2011-01-26 | 杭州耐特阀门有限公司 | Sealing surface free-grinding repairing method of slurry valve |
| CN203156419U (en) * | 2013-03-28 | 2013-08-28 | 寿光宝隆石油器材有限公司 | Rotary tool for lathe |
| CN203221385U (en) * | 2013-05-09 | 2013-10-02 | 杨中海 | Crystal and glass triangular bar circulating grinding machine |
| CN104551976A (en) * | 2013-10-29 | 2015-04-29 | 上海上冶阀门制造有限公司 | Multifunctional self-adaption ball valve grinding miller |
| CN105729270A (en) * | 2016-02-29 | 2016-07-06 | 苏州纽威阀门股份有限公司 | Grinding mechanism for valve core and valve seat |
| KR200485015Y1 (en) * | 2017-02-06 | 2017-11-20 | 유제수 | Lapping device for polishing seat suface of valve |
| CN206825014U (en) * | 2017-05-05 | 2018-01-02 | 无锡先导智能装备股份有限公司 | Clamping device |
| CN107186574A (en) * | 2017-07-21 | 2017-09-22 | 迅达科技集团股份有限公司 | A kind of plug valve of gas stove grinder and its Ginding process |
| CN107627198A (en) * | 2017-08-30 | 2018-01-26 | 重庆市永川区泰兴机械厂 | Sanding apparatus for boat diesel engine |
| CN107571143A (en) * | 2017-09-22 | 2018-01-12 | 云南冶金新立钛业有限公司 | The lapping device of air valve seat |
| CN208262567U (en) * | 2018-06-06 | 2018-12-21 | 温州大学 | A kind of valve seat grinding compressing fixture of adjustable positive pressure |
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