CN205310024U - Ball lapping machine - Google Patents
Ball lapping machine Download PDFInfo
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- CN205310024U CN205310024U CN201520932669.4U CN201520932669U CN205310024U CN 205310024 U CN205310024 U CN 205310024U CN 201520932669 U CN201520932669 U CN 201520932669U CN 205310024 U CN205310024 U CN 205310024U
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- support ring
- spheroid
- rotary table
- motor
- rotational axis
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Abstract
The utility model discloses a ball lapping machine, which comprises a frame, be provided with swivel work head in the frame, be provided with the first motor that links mutually with swivel work head in the frame, swivel work head go up to set up and to be used for fixed spheroid and to drive the rotatory clamping rotating mechanism of spheroid, clamping rotating mechanism including being used for fixed spheroidal spheroid anchor clamps and being used for the spheroid rotation to provide the 2nd motor of driving force, the frame on still be provided with the grinding mechanism that is used for the grinding ball body, the second motor on be provided with a power supply wire and the 2nd power supply wire, a power supply wire loop through electrically conductive metal swivel work head and connect on electrically conductive metal platen with electrically conductive metal bearing and electricity, the 2nd power supply wire connect in the top of brush feeler lever, below and the metal platen of brush feeler lever on electric brush piece rotate the electricity and be connected. The utility model has the advantages that structural design is reasonable, and second motor power supply wire can not take place winding etc..
Description
Technical field
The utility model relates to the processing units of a kind of ball valve accessory, specifically a kind of sphere grinder.
Background technology
Spheroid is the opening and closing element of ball valve, in prior art, in order to improve the stopping property of ball valve, usually adopts the sphere of valve seat and spheroid to carry out match grinding, makes to reach coordinating between ball seal face and valve seat best cooperation.
Usually, the grinding of spheroid is adopted hand lapping or mechanical mill usually, but hand lapping inefficiency, labour intensity is big, and ball seal end and valve seat are carried out match grinding by general of existing mechanical mill, cannot realize comprehensive grinding of sphere, cause spherome surface uneven, thus when ball valve unlatching or closedown, it is easy to abrasion valve seat, affects ball valve sealing performance.
By retrieval, China Patent Publication No. is that CN104325387A discloses sphere grinder. This ball lapping function realizes the grinding to the whole sphere of spheroid. But there is following problem in this sphere grinder:
(1), in its technical scheme, it is be installed on rotating disk for the 2nd motor driving turning axle to rotate, and rotating disk carries out rotating drive by the first motor. Therefore, easily it is wound around when rotating disk rotates for the electric power conductor powering to the 2nd motor, causes normally to continue power supply to the 2nd motor.
(2) its clamp structure arranges fairly simple, cannot be supported by spheroid fixing with stablizing.
Summary of the invention
The purpose of this utility model is the shortcoming and defect existed to overcome prior art, and provides a kind of reasonable in design, and the sphere grinder of winding can not occur the 2nd motor electric power conductor.
For achieving the above object, the technical solution of the utility model includes frame, described frame is provided with rotary table, frame is provided with the first motor being connected with rotary table, described rotary table is arranged and is used for fixing spheroid and drives the clamping rotating mechanism that spheroid rotates, described clamping rotating mechanism includes the spheroid fixture for fixing spheroid and the 2nd motor for spheroid rotation offer motivating force, described frame is also provided with the grinding mechanism for grinding spheroid, the 2nd described motor is provided with the first electric power conductor and the 2nd electric power conductor, described frame is provided with the metal platen of conduction relative to the lower section of rotary table, between the metal platen of described conduction and the lower end of rotary table, rotational support is provided with the metal bearing of conduction, the first described electric power conductor is electrically connected on rotary table, this rotary table is the metal rotation worktable of conduction, the first described electric power conductor successively by metal rotation worktable and the metal bearing of conduction of conduction and be electrically connected on the metal platen of conduction, the upper surface of described metal platen is also provided with insulation pad, described insulation pad is provided with the brush plate of annular, described rotary table is fixed relative to the top of brush plate and is worn and the brush feeler lever of mutually insulated, the 2nd described electric power conductor is connected to the top of brush feeler lever, the lower section of described brush feeler lever is rotated with the brush plate on metal platen and is electrically connected.By this setting, the first electric power conductor being used for powering to the 2nd motor and the 2nd electric power conductor are arranged by the way, then the first electric power conductor and the 2nd electric power conductor its position for rotary table are fixing, therefore, can effectively preventing the winding causing the first electric power conductor and the 2nd electric power conductor because of the rotation of rotary table, reasonable in design is ingenious.
The clamping rotating mechanism being described is set further and includes centre rotational axis, left support ring, right support ring, left thimble always becomes always to become with right thimble, described left support ring, right support ring is movably set in the two ends, left and right of centre rotational axis respectively, centre rotational axis is provided with for the spacing right support ring limited block of right support ring right-hand member relative to the right-hand member of right support ring, described centre rotational axis is provided with thread segment relative to the left end of left support ring, this thread segment is screwed and is connected with set nut, and the right-hand member of this set nut and the spacing top of left support ring connect, described left support ring, the inner of right support ring is provided with tensioner inclined-plane, the left and right sides supporting and location of the inner of described spheroid fixture is in left support ring, tensioner inclined-plane on right support ring, left support ring, right support ring under the effect of set nut on centre rotational axis in opposite directions near time, left support ring, the tensioner inclined-plane driving spheroid fixture of right support ring extends out to the radial direction of centre rotational axis and locks spheroid.
By this setting, by left support ring, the moving in opposite directions of right support ring, and make its tensioner ramp effect in spheroid fixture so that spheroid fixture outwards expands, thus clamps spheroid, and this arranges reasonable in design, and clamping stability is good.
Arrange the spheroid fixture being described further to include central tube and be fixedly installed the convex ring of left convex ring and the right side of central tube both sides, described central tube is provided with, along its circumferential direction is uniform, the line of cut that quantity is A, A be 4 or be greater than 4 even number, the direction, outer end of adjacent line of cut is contrary, and the outer end of adjacent line of cut extends cutting respectively on the convex ring of the convex ring in a left side and the right side, and described A road line of cut forms the line of cut of the circumference uniform distribution in A/2 road respectively on the convex ring of the convex ring in a left side and the right side.
By this setting, by this setting, spheroid fixture can independently can be extended out according to each slitting unit of its line of cut, when thus can process unfairness for some spheroid interior passageways, also spheroid fixture can be made to expand adaptively and clamp spheroid, drastically increase the stability of clamping.
The central tube both ends of the surface that further setting is described spheroid fixture are provided with the complementary adaptive central tube inclined plane part with the phase inclined-plane, tensioner inclined-plane on left support ring, right support ring respectively.
Arrange the right thimble being described further always to become to include the right support seat being fixed on rotary table, the 2nd described motor is fixedly installed on right support seat, and the 2nd motor output shaft on be linkedly set with Power output sleeve, this Power output sleeve outer end is connected with centre rotational axis coaxial linkage, being movably set with right thimble in described Power output sleeve, the outer end of described right thimble connects with the rotation top, right-hand member end face center of centre rotational axis and coordinates. By this setting, it provides what a kind of right thimble always became realizes structure, reasonable in design, it is good that top connects fitment stability.
Arrange the left thimble being described further always to become to include the left support seat being fixed on rotary table, the movable hole of the left support seat corresponding with centre rotational axis position it is provided with in described left support seat, in the movable hole of described left support seat, axially directed slippage is provided with left slipping block, intracardiac in the left end face of described left slipping block it is provided with center screw hole, on described left support seat, rotation is provided with locking screw mandrel, described locking screw mandrel is threaded with the center screw hole of left slipping block and coordinates, hole in annular it is provided with in the left end face of described left slipping block, rotate in hole in described annular and it is provided with left thimble, and the inner of this left thimble coordinates with the diapire limited support in hole in annular. by this setting, it provides what a kind of left thimble always became realizes structure, reasonable in design, it is good that top connects fitment stability.
Arrange further is that relative between left slipping block, adjacent lower section has been opened in locking hole to described left support seat, this locking hole is provided with two locking sleeves relative to the two bottom sides of left slipping block, connect with left slipping block top above the inner face of these two locking sleeves to support and coordinate, the center of two described locking sleeves is rotated and is inserted with locking driving stem, the outer end of this locking driving stem connects locking driving handle, and described locking driving stem is eccentric rod.By this setting, by the rotation of this locking driving stem, after centre rotational axis top is connect by left thimble in succession, the slippage of left slipping block can be locked, prevent left slipping block from loosening, thus ensure the stability that centre rotational axis top is connect by left thimble in succession.
The grinding mechanism being described is set further and includes the longitudinal track base being fixedly installed in frame and straight skidding guiding is arranged at the cylinder block of longitudinal track base, longitudinal cylinder it is provided with in described cylinder block, the outer end fixed action of the cylinder axis of this longitudinal direction cylinder is in frame and makes the longitudinally lifting on longitudinal track base of longitudinal air cylinder driven cylinder block, described cylinder block is fixedly installed the 3rd motor, 3rd motor is provided with eccentric dynamic output shaft, this eccentric dynamic output shaft is connected with the ground cover for grinding spheroid. By this setting, utilize longitudinal cylinder to realize the longitudinally lifting of the 3rd motor, facilitate ball lapping to add man-hour, the tripping action of spheroid.
The upper end bias that further setting is ground cover is connected with linkage sleeve pipe, and the linkage of described eccentric dynamic output shaft is inserted in linkage sleeve pipe, and between this eccentric dynamic output shaft and linkage sleeve pipe, resiliency supported is provided with coil tension spring. By this setting, the setting of this coil tension spring so that eccentric dynamic output shaft forms elastic soft support and connection in the vertical with linkage sleeve pipe, prevents ground cover locking on spheroid when grinding.
Below in conjunction with specification drawings and specific embodiments, the utility model is described further.
Accompanying drawing explanation
Fig. 1 the utility model embodiment structural representation;
The I portion enlarged view of Fig. 2 Fig. 1;
The A-A sectional view of Fig. 3 Fig. 1;
Fig. 4 the utility model embodiment stereographic map;
Fig. 5 spheroid fixture stereographic map of the present utility model.
Embodiment
Below by embodiment, the utility model is specifically described; only for the utility model is further described; can not being interpreted as the restriction to the utility model protection domain, the utility model can be made improvement and the adjustment of some non-intrinsically safes by the technician in this field according to the novel content of above-mentioned practicality.
The utility model embodiment as Figure 1-5, include frame 1, described frame is provided with rotary table 2, frame 1 is provided with the first motor 11 being connected with rotary table, described rotary table 2 is arranged and is used for fixing spheroid and drives the clamping rotating mechanism 3 that spheroid rotates, described clamping rotating mechanism 3 includes the spheroid fixture 31 for fixing spheroid and the 2nd motor 32 for spheroid rotation offer motivating force, described frame 1 is also provided with the grinding mechanism 4 for grinding spheroid, the 2nd described motor 32 is provided with the first electric power conductor 321 and the 2nd electric power conductor 322, this first electric power conductor 321 and the 2nd electric power conductor 322 are respectively used to connect the positive and negative electrode of power supply, described frame 1 is provided with the metal platen 21 of conduction relative to the lower section of rotary table 2, between the metal platen 21 of described conduction and the lower end of rotary table 2, rotational support is provided with the metal bearing 22 of conduction, the first described electric power conductor 321 is electrically connected on rotary table 2, this rotary table 2 is the metal rotation worktable of conduction, the first described electric power conductor 321 successively by metal rotation worktable and the metal bearing 22 of conduction of conduction and be electrically connected on the metal platen 21 of conduction, the upper surface of described metal platen 21 is also provided with insulation pad 23, described insulation pad 23 is provided with the brush plate 24 of annular, described rotary table 2 is fixed relative to the top of brush plate 24 and is worn and the brush feeler lever 25 of mutually insulated, the 2nd described electric power conductor 322 is connected to the top of brush feeler lever 25, the lower section of described brush feeler lever 25 is rotated with the brush plate 24 on metal platen 21 and is electrically connected.
In addition, clamping rotating mechanism 3 described in the present embodiment includes centre rotational axis 33, left support ring 34, right support ring 35, left thimble always becomes 36 always to become 37 with right thimble, described left support ring 34, right support ring 35 is movably set in the two ends, left and right of centre rotational axis 33 respectively, centre rotational axis 33 is provided with for the spacing right support ring limited block 331 of right support ring right-hand member relative to the right-hand member of right support ring 35, described centre rotational axis 33 is provided with thread segment 332 relative to the left end of left support ring, this thread segment 332 is screwed and is connected with set nut 333, and the right-hand member of this set nut 333 and the spacing top of left support ring 34 connect, described left support ring 34, the inner of right support ring 35 is provided with tensioner inclined-plane a, the left and right sides supporting and location of the inner of described spheroid fixture 31 is in left support ring 34, tensioner inclined-plane a on right support ring 35, left support ring 34, right support ring 35 under the effect of set nut 333 on centre rotational axis in opposite directions near time, left support ring 34, the tensioner inclined-plane a driving spheroid fixture of right support ring 35 extends out to the radial direction of centre rotational axis 33 and locks spheroid.
In addition, spheroid fixture 31 described in the present embodiment includes central tube 311, and it is fixedly installed the convex ring 313 of left convex ring 312 and the right side of central tube both sides, described central tube 311 is provided with, along its circumferential direction is uniform, the line of cut 314 that quantity is 8, the direction, outer end of adjacent line of cut is contrary, and the outer end of adjacent line of cut 314 extends cutting respectively on the convex ring of the convex ring in a left side and the right side, 8 described road lines of cut form the line of cut 314 of the circumference uniform distribution in 4 roads respectively on the convex ring of the convex ring in a left side and the right side, the central tube both ends of the surface of described spheroid fixture 31 be provided with respectively with left support ring, the complementary adaptive central tube inclined plane part b in a phase inclined-plane, tensioner inclined-plane on right support ring.
In addition, right thimble described in the present embodiment always becomes 37 to include the right support seat 371 being fixed on rotary table, the 2nd described motor 32 is fixedly installed on right support seat 371, and the 2nd motor 32 output shaft on be linkedly set with Power output sleeve 372, this Power output sleeve 372 outer end is connected with centre rotational axis 33 coaxial linkage, being movably set with right thimble 373 in described Power output sleeve 372, the outer end of described right thimble 373 connects with the rotation top, right-hand member end face center of centre rotational axis 33 and coordinates.
In addition, described left thimble always becomes 36 to include the left support seat 361 being fixed on rotary table, the movable hole 362 of the left support seat corresponding with centre rotational axis position it is provided with in described left support seat 361, in the movable hole 362 of described left support seat, axially directed slippage is provided with left slipping block 363, intracardiac in the left end face of described left slipping block 363 it is provided with center screw hole 3631, described left support seat 361 rotates and is provided with locking screw mandrel 364, described locking screw mandrel 364 is threaded with the center screw hole 3631 of left slipping block and coordinates, hole 3632 in annular it is provided with in the left end face of described left slipping block 363, rotate in hole in described annular and it is provided with left thimble 365, and the inner of this left thimble 365 coordinates with the diapire limited support in hole in annular, relative between left slipping block 363, adjacent lower section has been opened in locking hole 366 to described left support seat 361, this locking hole is provided with two locking sleeves 367 relative to the two bottom sides of left slipping block, connect with left slipping block top above the inner face of these two locking sleeves 367 to support and coordinate, the center of two described locking sleeves 367 is rotated and is inserted with locking driving stem 368, the outer end of this locking driving stem 368 connects locking driving handle 369, described locking driving stem 368 is eccentric rod.
In addition, grinding mechanism 4 described in the present embodiment includes the longitudinal track base 41 being fixedly installed in frame, and straight skidding guiding is arranged at the cylinder block 42 of longitudinal track base, longitudinal cylinder it is provided with in described cylinder block, the outer end fixed action of the cylinder axis of this longitudinal direction cylinder is in frame and makes the longitudinally lifting on longitudinal track base 41 of longitudinal air cylinder driven cylinder block 42, described cylinder block 42 is fixedly installed the 3rd motor 43, 3rd motor 43 is provided with eccentric dynamic output shaft 431, this eccentric dynamic output shaft 431 is connected with the ground cover 44 for grinding spheroid, the upper end bias of ground cover 44 is connected with linkage sleeve pipe 441, the linkage of described eccentric dynamic output shaft 431 is inserted in linkage sleeve pipe 441, and resiliency supported is provided with coil tension spring 45 between this eccentric dynamic output shaft 431 and linkage sleeve pipe 441.
Claims (9)
1. a sphere grinder, include frame, described frame is provided with rotary table, frame is provided with the first motor being connected with rotary table, described rotary table is arranged and is used for fixing spheroid and drives the clamping rotating mechanism that spheroid rotates, described clamping rotating mechanism includes the spheroid fixture for fixing spheroid and the 2nd motor for spheroid rotation offer motivating force, described frame is also provided with the grinding mechanism for grinding spheroid, it is characterized in that: the 2nd described motor is provided with the first electric power conductor and the 2nd electric power conductor, described frame is provided with the metal platen of conduction relative to the lower section of rotary table, between the metal platen of described conduction and the lower end of rotary table, rotational support is provided with the metal bearing of conduction, the first described electric power conductor is electrically connected on rotary table, this rotary table is the metal rotation worktable of conduction, the first described electric power conductor successively by metal rotation worktable and the metal bearing of conduction of conduction and be electrically connected on the metal platen of conduction, the upper surface of described metal platen is also provided with insulation pad, described insulation pad is provided with the brush plate of annular, described rotary table is fixed relative to the top of brush plate and is worn and the brush feeler lever of mutually insulated, the 2nd described electric power conductor is connected to the top of brush feeler lever, the lower section of described brush feeler lever is rotated with the brush plate on metal platen and is electrically connected.
2. a kind of sphere grinder according to claim 1, it is characterized in that: described clamping rotating mechanism includes centre rotational axis, left support ring, right support ring, left thimble always becomes always to become with right thimble, described left support ring, right support ring is movably set in the two ends, left and right of centre rotational axis respectively, centre rotational axis is provided with for the spacing right support ring limited block of right support ring right-hand member relative to the right-hand member of right support ring, described centre rotational axis is provided with thread segment relative to the left end of left support ring, this thread segment is screwed and is connected with set nut, and the right-hand member of this set nut and the spacing top of left support ring connect, described left support ring, the inner of right support ring is provided with tensioner inclined-plane, the left and right sides supporting and location of the inner of described spheroid fixture is in left support ring, tensioner inclined-plane on right support ring, left support ring, right support ring under the effect of set nut on centre rotational axis in opposite directions near time, left support ring, the tensioner inclined-plane driving spheroid fixture of right support ring extends out to the radial direction of centre rotational axis and locks spheroid.
3. a kind of sphere grinder according to claim 1 and 2, it is characterized in that: described spheroid fixture includes central tube and is fixedly installed the convex ring of left convex ring and the right side of central tube both sides, described central tube is provided with, along its circumferential direction is uniform, the line of cut that quantity is A, A be 4 or be greater than 4 even number, the direction, outer end of adjacent line of cut is contrary, and the outer end of adjacent line of cut extends cutting respectively on the convex ring of the convex ring in a left side and the right side, and described A road line of cut forms the line of cut of the circumference uniform distribution in A/2 road respectively on the convex ring of the convex ring in a left side and the right side.
4. a kind of sphere grinder according to claim 3, it is characterised in that: the central tube both ends of the surface of described spheroid fixture are provided with the complementary adaptive central tube inclined plane part with the phase inclined-plane, tensioner inclined-plane on left support ring, right support ring respectively.
5. a kind of sphere grinder according to claim 2, it is characterized in that: described right thimble always becomes to include the right support seat being fixed on rotary table, the 2nd described motor is fixedly installed on right support seat, and the 2nd motor output shaft on be linkedly set with Power output sleeve, this Power output sleeve outer end is connected with centre rotational axis coaxial linkage, being movably set with right thimble in described Power output sleeve, the outer end of described right thimble connects with the rotation top, right-hand member end face center of centre rotational axis and coordinates.
6. a kind of sphere grinder according to claim 2, it is characterized in that: described left thimble always becomes to include the left support seat being fixed on rotary table, the movable hole of the left support seat corresponding with centre rotational axis position it is provided with in described left support seat, in the movable hole of described left support seat, axially directed slippage is provided with left slipping block, intracardiac in the left end face of described left slipping block it is provided with center screw hole, on described left support seat, rotation is provided with locking screw mandrel, described locking screw mandrel is threaded with the center screw hole of left slipping block and coordinates, hole in annular it is provided with in the left end face of described left slipping block, rotate in hole in described annular and it is provided with left thimble, and the inner of this left thimble coordinates with the diapire limited support in hole in annular.
7. a kind of sphere grinder according to claim 6, it is characterized in that: relative between left slipping block, adjacent lower section has been opened in locking hole to described left support seat, this locking hole is provided with two locking sleeves relative to the two bottom sides of left slipping block, connect with left slipping block top above the inner face of these two locking sleeves to support and coordinate, the center of two described locking sleeves is rotated and is inserted with locking driving stem, the outer end of this locking driving stem connects locking driving handle, and described locking driving stem is eccentric rod.
8. sphere grinder according to claim 1, it is characterized in that: described grinding mechanism includes the longitudinal track base being fixedly installed in frame, and straight skidding guiding is arranged at the cylinder block of longitudinal track base, longitudinal cylinder it is provided with in described cylinder block, the outer end fixed action of the cylinder axis of this longitudinal direction cylinder is in frame and makes the longitudinally lifting on longitudinal track base of longitudinal air cylinder driven cylinder block, described cylinder block is fixedly installed the 3rd motor, 3rd motor is provided with eccentric dynamic output shaft, this eccentric dynamic output shaft is connected with the ground cover for grinding spheroid.
9. sphere grinder according to claim 8, it is characterized in that: the upper end bias of ground cover is connected with linkage sleeve pipe, the linkage of described eccentric dynamic output shaft is inserted in linkage sleeve pipe, and between this eccentric dynamic output shaft and linkage sleeve pipe, resiliency supported is provided with coil tension spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520932669.4U CN205310024U (en) | 2015-11-20 | 2015-11-20 | Ball lapping machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520932669.4U CN205310024U (en) | 2015-11-20 | 2015-11-20 | Ball lapping machine |
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| Publication Number | Publication Date |
|---|---|
| CN205310024U true CN205310024U (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520932669.4U Active CN205310024U (en) | 2015-11-20 | 2015-11-20 | Ball lapping machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234805A (en) * | 2015-11-20 | 2016-01-13 | 超达阀门集团股份有限公司 | Ball lapping machine |
| CN106272115A (en) * | 2016-10-25 | 2017-01-04 | 叶明俤 | A kind of stone material sandblasting machine workbench and the blasting method of stone material sandblasting machine |
| CN109571168A (en) * | 2018-12-12 | 2019-04-05 | 台州市路桥绿康蓄电自动喷雾器厂 | Vehicle hub milling apparatus |
| CN110142663A (en) * | 2019-05-22 | 2019-08-20 | 施阿丹 | A kind of ball for ball valve periphery self-acting grinding machine and application method |
| CN111070025A (en) * | 2020-01-02 | 2020-04-28 | 储威 | Grinding machine tool for processing inner spherical surface |
| CN113857975A (en) * | 2021-09-02 | 2021-12-31 | 超达阀门集团股份有限公司 | Polishing device for spherical valve and production process thereof |
-
2015
- 2015-11-20 CN CN201520932669.4U patent/CN205310024U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234805A (en) * | 2015-11-20 | 2016-01-13 | 超达阀门集团股份有限公司 | Ball lapping machine |
| CN106272115A (en) * | 2016-10-25 | 2017-01-04 | 叶明俤 | A kind of stone material sandblasting machine workbench and the blasting method of stone material sandblasting machine |
| CN106272115B (en) * | 2016-10-25 | 2019-01-04 | 叶明俤 | A kind of blasting method of stone material sandblasting machine worktable and stone material sand-blasting machine |
| CN109571168A (en) * | 2018-12-12 | 2019-04-05 | 台州市路桥绿康蓄电自动喷雾器厂 | Vehicle hub milling apparatus |
| CN110142663A (en) * | 2019-05-22 | 2019-08-20 | 施阿丹 | A kind of ball for ball valve periphery self-acting grinding machine and application method |
| CN111070025A (en) * | 2020-01-02 | 2020-04-28 | 储威 | Grinding machine tool for processing inner spherical surface |
| CN113857975A (en) * | 2021-09-02 | 2021-12-31 | 超达阀门集团股份有限公司 | Polishing device for spherical valve and production process thereof |
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