CN208262561U - Pipe fitting internal hole vertical fine grinding device - Google Patents
Pipe fitting internal hole vertical fine grinding device Download PDFInfo
- Publication number
- CN208262561U CN208262561U CN201820790300.8U CN201820790300U CN208262561U CN 208262561 U CN208262561 U CN 208262561U CN 201820790300 U CN201820790300 U CN 201820790300U CN 208262561 U CN208262561 U CN 208262561U
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- square tube
- pipe fitting
- hole
- fixing body
- grinding device
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Abstract
Pipe fitting internal hole vertical fine grinding device, including pedestal, vertical lifting mechanism and the bracket positioned at vertical lift front side are provided on pedestal, the upper end edge anterior-posterior horizontal direction of vertical lifting mechanism is fixedly installed the cantilever beam right above bracket, top on front side of cantilever beam is fixedly installed frequency conversion grinding motor, the main shaft of frequency conversion grinding motor is arranged vertically downward and coaxial is connected with an electromagnetism adjustable type finishing grinding wheel, it is provided with workbench on bracket, the fixture for clamping pipe fitting outer wall is provided on workbench.It is motionless that the utility model uses pipe fitting to be clamped, and the grinding method of the vertically reciprocating movement of grinding tool is refined.And be pressed in honing abrasive belt vertically on ground pipe fitting bore area using electromagnetic force, honing abrasive belt depends on the size of current for being passed through coil to the normal pressure size of ground inner hole, and can step-less adjustment grinding force, also improve honing precision and honing efficiency.
Description
Technical field
The utility model belongs to technical field of mechanical processing more particularly to a kind of pipe fitting internal hole vertical fine grinding device.
Background technique
The required precision of the inner hole of pipe fitting (such as cylinder body of hydraulic cylinder or cylinder) is higher, when processing pipe fitting inner hole, essence
Mill is an essential procedure, and there are many kinds of fine grinding tools used in fine grinding, and fine grinding principle is typically all to use
Mechanical force makes honing abrasive belt act on the bore area of pipe fitting, and grinding force is not easy to adjust when fine grinding, directly affects pipe fitting inner hole
Processing quality and processing efficiency.In addition, existing grinding operation is usually that clamped pipe fitting is mobile, grinding tool is only rotated and is not moved
It is dynamic.
Utility model content
The utility model in order to solve shortcoming in the prior art, provide a kind of grinding force is adjustable, honing precision is high,
The pipe fitting internal hole vertical fine grinding device that honing is high-efficient, pipe fitting is fixed, grinding tool had not only been rotated but also moved axially.
In order to solve the above technical problems, the utility model adopts the following technical solution: pipe fitting internal hole vertical fine grinding device, packet
Pedestal is included, vertical lifting mechanism and the bracket positioned at vertical lift front side, the upper end edge of vertical lifting mechanism are provided on pedestal
Anterior-posterior horizontal direction is fixedly installed the cantilever beam right above bracket, and the top on front side of cantilever beam is fixedly installed frequency conversion mill
Cut motor, the main shaft of frequency conversion grinding motor is arranged vertically downward and coaxial is connected with an electromagnetism adjustable type finishing grinding wheel, bracket
On be provided with workbench, the fixture for clamping pipe fitting outer wall is provided on workbench.
Electromagnetism adjustable type finishing grinding wheel includes the fixing body that center line is arranged in vertical, and fixing body shape is cylindrical,
Axially disposed several rectangular channels on fixing body outer circumference surface, several rectangular channels are evenly distributed in the circumferential direction, fixing body
Each rectangular channel in be provided with the magnetizer that can be slided along fixing body radial direction, the lower end surface and upper surface of fixing body point
Lower cover and upper end cover are not connected with it；
Through-hole is correspondingly arranged on along centerline direction in fixing body and upper end cover, on the middle part edge of each rectangular channel on fixing body
Diameter direction is provided with the threading hole communicated with through-hole；Magnetizer includes magnet steel, coil and honing abrasive belt, and magnet steel is in left and right two
The big centre in end is rod-shaped dumbbell structure, and coil is wrapped in the stem portion of the centre of magnet steel；Magnet steel left and right ends head
Outer surface setting it is fluted, honing abrasive belt is mounted in groove and, the lower end of magnet steel affixed by resin glue and magnet steel
It is provided with stroke limit abutment on the inside of face and upper surface, on the right side of lower cover and the left side of upper end cover radially
Direction is provided with the limiting slot matched with stroke limit abutment.
Fixing body, lower cover and upper end cover are all made of non-magnet material and are made, and each limiting slot is rectangular configuration, lower end
Lid and upper end cover pass through several fastening bolts respectively and are fixedly connected with the lower end of fixing body and upper end, the upper end of upper end cover
Coaxial to be provided with hollow cylinder, hollow cylinder upper end is connect by first shaft coupling with the main shaft lower end of frequency conversion grinding motor, frequency conversion
The main shaft of grinding motor is hollow structure, inside the main shaft of frequency conversion grinding motor, it is corresponding with through-hole inside hollow cylinder be connected to, coil
It is connected with the conducting wire for successively connecting power supply outward along the main shaft of threading hole, through-hole, hollow cylinder and frequency conversion grinding motor.
The cross section of magnet steel left and right ends is rectangle, and the cross section of middle part stem portion is rectangle or circle.
The length direction of honing abrasive belt is parallel to the center line of fixing body.
The number of magnetizer is depended on by the size of Hole honing；Bigger by the aperture of Hole honing, magnetizer number is got over
More, the number of magnetizer is at least 2.
Vertical lifting mechanism includes bottom plate, outer square tube, interior square tube and motor reducer, and bottom plate passes through the fixed peace of connection bolt
On pedestal, outer square tube and interior square tube are arranged in vertical, and outer square tube lower end is fixedly connected on bottom plate, under outer square tube
Lower stiffener plate is provided between plate upper surface on the outside of portion, the lower rearward side of outer square tube is provided with mounting hole, and motor subtracts
Fast machine passes through mounting hole and is arranged on the bottom plate in outer square tube, and interior square tube upper end is fixedly connected with cantilever beam rear end bottom, interior side
Stiffener plate is provided between pipe upper front and cantilever beam bottom, interior square tube lower slide is plugged in outer square tube, interior side
The outside side length of pipe is equal to the inner hole side length of outer square tube, is fixedly installed link block inside interior square tube, offers in link block
Under penetrating threaded hole, the main shaft upper end of motor reducer is sequentially connected with a lead screw, silk by the way that second shaft coupling is coaxial
Thick stick passes through threaded hole from bottom to top and is threadedly coupled with link block.
Lead screw upper end is fixedly installed connection frame, and the surrounding of connection frame is rotatably connected to an idler wheel, each idler wheel respectively
Correspondence is connect with one side roll of inner wall of interior square tube.
Foreign side's pipe top outer is provided with the flexible dust-break set covered on outside interior square tube and outer square tube.
By adopting the above technical scheme, the grinding process and principle of the utility model are as follows: columnar pipe fitting is placed and pressed from both sides
It holds in fixture on the table, it is ensured that the inner hole centreline of pipe fitting is overlapped with the center line of fixing body, starts frequency conversion grinding electric
Machine and motor reducer, frequency conversion grinding motor drive electromagnetism adjustable type finishing grinding wheel high speed rotation, and motor reducer drives lead screw to turn
Dynamic, the link block connecting with threads of lead screw just drives interior square tube to move down, and is fixedly connected with the cantilever beam in interior square tube upper end
It is followed by and moves down, the frequency conversion grinding motor and electromagnetism adjustable type finishing grinding wheel on the right side of cantilever beam also move down, when electromagnetism tune
It after section formula finishing grinding wheel enters the inner hole of pipe fitting, is powered to the coil being wound on magnet steel, the magnet steel of magnetizer generates magnetic
, since processed workpiece is made of magnetic material, attraction is generated between magnetizer and workpiece to be machined, in the work of magnetic force
Under, magnetizer, along the radially outward sliding of fixing body, is pressed towards the inner hole table of grinding workpiece in the rectangular channel of fixing body
Face, magnet steel and ground workpiece constitute closed magnetic circuit, the size of current of coil are passed through by changing, to change magnetizer
To the size of the normal pressure of the bore area of grinding workpiece, the step-less adjustment of grinding force is realized；Motor reducer rotates forward and anti-
Turn, moves up and down electromagnetism adjustable type finishing grinding wheel in the inner hole of pipe fitting, the inner hole of pipe fitting is refined.
Lower cover and upper end cover pass through bolt respectively and are fixedly connected with fixing body, so simultaneously convenient for each component of separately manufacturing
And it is easy for installation and removal.Limiting slot plays the role of restriction magnetizer and radially moves, and also defines honing abrasive belt
The radius of gyration (maximum grinding radius).
Since screw rod length is longer, in order to ensure in rotation, beat does not connect screw rod in the upper end of screw rod setting connection frame
It connects and four rolling is set on frame, four side of inner wall of four rolling and interior square tube, which rolls, to be cooperated, and thus defines that screw rod is turning
Concentricity is kept when dynamic.
Since the outer wall of interior square tube and the inner wall of outer square tube are slidably connected, in order to avoid dust by outer square tube upper port into
Enter, and influence between interior square tube and outer square tube it is good be slidably matched, be specially provided with and cover in outer square tube top outer
Flexible dust-break set outside interior square tube and outer square tube.
In conclusion the utility model is clamped motionless, the grinding method of the vertically reciprocating movement of grinding tool using pipe fitting
It is refined.And honing abrasive belt is pressed in vertically on ground pipe fitting bore area using electromagnetic force, honing abrasive belt is to being ground
The normal pressure size for cutting inner hole depends on being passed through the size of current of coil, and can step-less adjustment grinding force, also improve honing essence
Degree and honing efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the schematic cross-sectional view of electromagnetism adjustable type finishing grinding wheel in axial direction in this Fig. 1；
Fig. 3 is the A-A diagrammatic cross-section in Fig. 2；
Fig. 4 is the schematic perspective view of fixing body in Fig. 2；
Fig. 5 is the schematic perspective view of magnet steel in Fig. 2.
Specific embodiment
As Figure 1-Figure 5, the pipe fitting internal hole vertical fine grinding device of the utility model, including pedestal 17 are set on pedestal 17
It is equipped with vertical lifting mechanism and the bracket 18 positioned at vertical lift front side, the upper end edge anterior-posterior horizontal direction of vertical lifting mechanism is solid
Surely the top of the cantilever beam 19 being provided with right above bracket 18,19 front side of cantilever beam is fixedly installed frequency conversion grinding motor
20, the main shaft of frequency conversion grinding motor 20 is arranged vertically downward and coaxial is connected with an electromagnetism adjustable type finishing grinding wheel 21, bracket
It is provided with workbench 22 on 18, the fixture 24 for clamping 23 outer wall of pipe fitting is provided on workbench 22.
Electromagnetism adjustable type finishing grinding wheel 21 includes the fixing body 1 that center line is arranged in vertical, and 1 shape of fixing body is in cylinder
Shape, axially disposed several rectangular channels 2 on 1 outer circumference surface of fixing body, several rectangular channels 2 are evenly distributed in the circumferential direction,
The magnetizer that can be slided along 1 radial direction of fixing body, the lower end surface of fixing body 1 are provided in each rectangular channel 2 of fixing body 1
Lower cover 4 and upper end cover 5 are connected separately with upper surface；
Through-hole 6 is correspondingly arranged on along centerline direction in fixing body 1 and upper end cover 5, in each rectangular channel 2 on fixing body 1
Middle part is provided with the threading hole 7 communicated with through-hole 6 along diameter direction；Magnetizer includes magnet steel 8, coil 9 and honing abrasive belt 10, magnetic
It is rod-shaped dumbbell structure that steel body 8 is intermediate greatly in left and right ends head, and coil 9 is wrapped in the stem portion of the centre of magnet steel 8；Magnetic
The outer surface setting fluted 11 of 8 left and right ends of steel body head, honing abrasive belt 10 is mounted in groove 11 and by resin glue and magnetic
Steel body 8 is affixed, and stroke limit abutment 12, the right side of lower cover 4 are provided on the inside of the lower end surface and upper surface of magnet steel 8
With the limiting slot 13 matched with stroke limit abutment 12 is radially provided on the left side of upper end cover 5.
Fixing body 1, lower cover 4 and upper end cover 5 are all made of non-magnet material and are made, and each limiting slot 13 is rectangle knot
Structure, lower cover 4 and upper end cover 5 are fixedly connected by several fastening bolts 14 with the lower end of fixing body 1 and upper end respectively,
The upper end of upper end cover 5 is coaxial to be provided with hollow cylinder 15, and 15 upper end of hollow cylinder passes through first shaft coupling 3 and frequency conversion grinding motor 20
The connection of main shaft lower end, the main shaft of frequency conversion grinding motor 20 is hollow structure, inside the main shaft of frequency conversion grinding motor 20, hollow cylinder
The connection corresponding with through-hole 6 of 15 inside, coil 9 are connected with successively along threading hole 7, through-hole 6, hollow cylinder 15 and frequency conversion grinding motor 20
Main shaft connect the conducting wire 16 of power supply outward.
The cross section of 8 left and right ends of magnet steel is rectangle, and the cross section of middle part stem portion is rectangle or circle.
The length direction of honing abrasive belt 10 is parallel to the center line of fixing body 1.
The number of magnetizer is depended on by the size of Hole honing；Bigger by the aperture of Hole honing, magnetizer number is got over
More, the number of magnetizer is at least 2.
Vertical lifting mechanism includes bottom plate 25, outer square tube 26, interior square tube 27 and motor reducer 28, and bottom plate 25 passes through connection
Bolt 29 is fixedly mounted on pedestal 17, and outer square tube 26 and interior square tube 27 are arranged in vertical, and outer 26 lower end of square tube is fixed
It is connected on bottom plate 25, outer 26 lower outside of square tube is provided with lower stiffener plate 30, outer square tube between 25 upper surface of bottom plate
26 lower rearward side is provided with mounting hole 31, and motor reducer 28 passes through mounting hole 31 and the bottom plate 25 in outer square tube 26 is arranged in
On, interior 27 upper end of square tube is fixedly connected with 19 rear end bottom of cantilever beam, between interior 27 upper front of square tube and 19 bottom of cantilever beam
It is provided with stiffener plate 32, interior 27 lower slide of square tube is plugged in outer square tube 26, and the outside side length of interior square tube 27 is equal to outer
The inner hole side length of square tube 26 is fixedly installed link block 33 inside interior square tube 27, transparent spiral shell is offered in link block 33
The main shaft upper end of pit, motor reducer 28 is sequentially connected with a lead screw 34, lead screw 34 by the way that second shaft coupling 34 is coaxial
Threaded hole is passed through from bottom to top and is threadedly coupled with link block 33.
34 upper end of lead screw is fixedly installed connection frame 35, and the surrounding of connection frame 35 is rotatably connected to an idler wheel 36 respectively,
Each idler wheel 36 correspondence is connect with one side roll of inner wall of interior square tube 27.
Outer 26 top outer of square tube is provided with the flexible dust-break set 37 covered on outside interior square tube 27 and outer square tube 26.
The grinding process and principle of the utility model are as follows: columnar pipe fitting 23 is placed and is clamped on workbench 22
In fixture 24, it is ensured that the inner hole centreline of pipe fitting 23 is overlapped with the center line of fixing body 1, starts frequency conversion grinding motor 20 and motor
Speed reducer 28, frequency conversion grinding motor 20 drive 21 high speed rotation of electromagnetism adjustable type finishing grinding wheel, and motor reducer 28 drives lead screw 34
Rotation, the link block 33 being threadedly coupled with lead screw 34 just drive interior square tube 27 to move down, are fixedly connected in interior 27 upper end of square tube
Cantilever beam 19 be also followed by and move down, the frequency conversion grinding motor 20 and electromagnetism adjustable type finishing grinding wheel 21 on 19 right side of cantilever beam
It moves down, it is logical to the coil 9 being wound on magnet steel 8 after electromagnetism adjustable type finishing grinding wheel 21 enters the inner hole of pipe fitting 23
The magnet steel 8 of electricity, magnetizer generates magnetic field, since processed workpiece is made of magnetic material, magnetizer and workpiece to be machined
Between generate attraction, under the magnetic force, magnetizer radially outward sliding along fixing body 1 in the rectangular channel 2 of fixing body 1
It is dynamic, it is pressed towards the bore area of grinding workpiece, magnet steel 8 and ground workpiece constitute closed magnetic circuit, be passed through by changing
The size of current of coil 9 realizes grinding force to change magnetizer to the size of the normal pressure of the bore area of grinding workpiece
Step-less adjustment；Motor reducer 28 rotates and reverse, make electromagnetism adjustable type finishing grinding wheel 21 in the inner hole of pipe fitting 23 on move down
It is dynamic, the inner hole of pipe fitting 23 is refined.
Lower cover 4 and upper end cover 5 are fixedly connected by bolt with fixing body 1 respectively, are convenient for each structure of separately manufacturing in this way
It part and is easy for installation and removal.Limiting slot 13 plays the role of restriction magnetizer and radially moves, and also defines honing
The radius of gyration (maximum grinding radius) of emery stick 10.
Since screw rod length is longer, in order to ensure screw rod in rotation not beat, in the upper end of screw rod, connection frame 35 is set,
Four rolling 36 is set on connection frame 35, and four side of the inner wall rolling of four rolling 36 and interior square tube 27 cooperates, thus limits
Screw rod keeps concentricity in rotation.
Since the outer wall of interior square tube 27 and the inner wall of outer square tube 26 are slidably connected, in order to avoid dust is by outer 26 upper end of square tube
Mouthful place enters, and influence between interior square tube 27 and outer square tube 26 it is good be slidably matched, specially outer 26 top of square tube outside
Side is provided with the flexible dust-break set 37 covered on outside interior square tube 27 and outer square tube 26.
The present embodiment not makes any form of restriction the shape of the utility model, material, structure etc., all foundations
The technical essence of the utility model any simple modification, equivalent change and modification to the above embodiments, belong to this reality
With the protection scope of new technique scheme.
Claims (9)
1. pipe fitting internal hole vertical fine grinding device, it is characterised in that: including pedestal, vertical lifting mechanism is provided on pedestal and is located at
It is vertically moved up or down the bracket of front side, the upper end edge anterior-posterior horizontal direction of vertical lifting mechanism is fixedly installed right above bracket
Cantilever beam, the top on front side of cantilever beam are fixedly installed frequency conversion grinding motor, and the main shaft of frequency conversion grinding motor is arranged vertically downward
And it is coaxial be connected with an electromagnetism adjustable type finishing grinding wheel, be provided with workbench on bracket, be provided on workbench for clamping
The fixture of pipe fitting outer wall.
2. pipe fitting internal hole vertical fine grinding device according to claim 1, it is characterised in that: electromagnetism adjustable type finishing grinding wheel includes
The fixing body that center line is arranged in vertical, fixing body shape is cylindrical, if axially disposed on fixing body outer circumference surface
Dry rectangular channel, several rectangular channels are evenly distributed in the circumferential direction, and being provided in each rectangular channel of fixing body can be along peace
The magnetizer of body radial direction sliding is filled, the lower end surface and upper surface of fixing body are connected separately with lower cover and upper end cover；
Through-hole is correspondingly arranged on along centerline direction in fixing body and upper end cover, at the middle part of each rectangular channel along diameter side on fixing body
To being provided with the threading hole communicated with through-hole；Magnetizer includes magnet steel, coil and honing abrasive belt, and magnet steel is in left and right ends head
It is rod-shaped dumbbell structure among big, coil is wrapped in the stem portion of the centre of magnet steel；Outside the head of magnet steel left and right ends
Surface setting is fluted, and honing abrasive belt is mounted in groove and affixed by resin glue and magnet steel, the lower end surface of magnet steel with
It is provided with stroke limit abutment on the inside of upper surface, on the right side of lower cover and the left side of upper end cover radially
It is provided with the limiting slot matched with stroke limit abutment.
3. pipe fitting internal hole vertical fine grinding device according to claim 2, it is characterised in that: fixing body, lower cover and upper end
Lid is all made of non-magnet material and is made, and each limiting slot is rectangular configuration, and it is tight that lower cover and upper end cover pass through several respectively
Fixing bolt is fixedly connected with the lower end of fixing body and upper end, and the upper end of upper end cover is coaxial to be provided with hollow cylinder, hollow cylinder
Upper end is connect by first shaft coupling with the main shaft lower end of frequency conversion grinding motor, and the main shaft of frequency conversion grinding motor is hollow structure,
Inside the main shaft of frequency conversion grinding motor, it is corresponding with through-hole inside hollow cylinder be connected to, coil be connected with successively along threading hole, through-hole,
The main shaft of hollow cylinder and frequency conversion grinding motor connects the conducting wire of power supply outward.
4. pipe fitting internal hole vertical fine grinding device according to claim 2, it is characterised in that: magnet steel left and right ends it is cross-section
Face is rectangle, and the cross section of middle part stem portion is rectangle or circle.
5. pipe fitting internal hole vertical fine grinding device according to claim 2, it is characterised in that: the length direction of honing abrasive belt is flat
Row is in the center line of fixing body.
6. pipe fitting internal hole vertical fine grinding device according to claim 2, it is characterised in that: the number of magnetizer depends on quilt
The size of Hole honing；Bigger by the aperture of Hole honing, magnetizer number is more, and the number of magnetizer is at least 2.
7. pipe fitting internal hole vertical fine grinding device according to claim 1, it is characterised in that: vertical lifting mechanism includes bottom
Plate, outer square tube, interior square tube and motor reducer, bottom plate are fixedly mounted on pedestal by connecting bolt, outer square tube and interior square tube
It is arranged in vertical, outer square tube lower end is fixedly connected on bottom plate, and outer square tube lower outside is between plate upper surface
It is provided with lower stiffener plate, the lower rearward side of outer square tube is provided with mounting hole, and motor reducer passes through mounting hole and is arranged in foreign side
On bottom plate in pipe, interior square tube upper end is fixedly connected with cantilever beam rear end bottom, interior square tube upper front and cantilever beam bottom it
Between be provided with stiffener plate, interior square tube lower slide is plugged in outer square tube, and the outside side length of interior square tube is equal to outer square tube
Inner hole side length is fixedly installed link block inside interior square tube, transparent threaded hole, motor reducer is offered in link block
Main shaft upper end be sequentially connected with a lead screw by the way that second shaft coupling is coaxial, lead screw pass through from bottom to top threaded hole and with even
Connect block threaded connection.
8. pipe fitting internal hole vertical fine grinding device according to claim 7, it is characterised in that: lead screw upper end is fixedly installed company
Frame is connect, the surrounding of connection frame is rotatably connected to an idler wheel, corresponding one side roll of inner wall with interior square tube of each idler wheel respectively
Connection.
9. pipe fitting internal hole vertical fine grinding device according to claim 7, it is characterised in that: foreign side's pipe top outer is provided with
Cover on the flexible dust-break set outside interior square tube and outer square tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820790300.8U CN208262561U (en) | 2018-05-25 | 2018-05-25 | Pipe fitting internal hole vertical fine grinding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820790300.8U CN208262561U (en) | 2018-05-25 | 2018-05-25 | Pipe fitting internal hole vertical fine grinding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208262561U true CN208262561U (en) | 2018-12-21 |
Family
ID=64685743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820790300.8U Expired - Fee Related CN208262561U (en) | 2018-05-25 | 2018-05-25 | Pipe fitting internal hole vertical fine grinding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208262561U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108436751A (en) * | 2018-05-25 | 2018-08-24 | 张冉 | Pipe fitting internal hole vertical fine grinding device |
| CN109648411A (en) * | 2019-01-22 | 2019-04-19 | 马鞍山市粤美金属制品科技实业有限公司 | A kind of rotating disc type bearing machining inner ring equipment for grinding and method for grinding |
| CN110539218A (en) * | 2019-09-26 | 2019-12-06 | 湖州华龙智能科技有限公司 | Automatic change iron drum inner wall grinding device of control |
-
2018
- 2018-05-25 CN CN201820790300.8U patent/CN208262561U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108436751A (en) * | 2018-05-25 | 2018-08-24 | 张冉 | Pipe fitting internal hole vertical fine grinding device |
| CN109648411A (en) * | 2019-01-22 | 2019-04-19 | 马鞍山市粤美金属制品科技实业有限公司 | A kind of rotating disc type bearing machining inner ring equipment for grinding and method for grinding |
| CN110539218A (en) * | 2019-09-26 | 2019-12-06 | 湖州华龙智能科技有限公司 | Automatic change iron drum inner wall grinding device of control |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181221 Termination date: 20190525 |
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| CF01 | Termination of patent right due to non-payment of annual fee |