CN204504916U - A kind of peripheral milling being convenient to assemble and safeguard - Google Patents
A kind of peripheral milling being convenient to assemble and safeguard Download PDFInfo
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- CN204504916U CN204504916U CN201520190583.9U CN201520190583U CN204504916U CN 204504916 U CN204504916 U CN 204504916U CN 201520190583 U CN201520190583 U CN 201520190583U CN 204504916 U CN204504916 U CN 204504916U
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Abstract
The utility model discloses a kind of peripheral milling being convenient to assemble and safeguard, belong to machine tool technology field.The utility model comprises sleeve, housing, cover plate, emery wheel and sliding bearing, and housing is arranged at sleeve inner, and the two ends of this housing are by cover plate for sealing, and sliding bearing laterally runs through housing, and one end of this sliding bearing is connected with emery wheel; The main shaft of sliding bearing and the contact site of bearing shell are provided with ceramic coating, and enclosure interior is provided with return line, and this return line is communicated with the grease-box of sleeve outside, and lubricating oil is zero negative-pressure cyclic circulation in return line.The utility model coats ceramic coating at the friction position of main shaft and bearing shell, solves thermal expansion deformation and the wear problem of metal main shaft; Simultaneously, the utility model is according to peripheral milling own structural characteristics, and for peripheral milling devises brand-new oil-leakage-prevention pipeline, this oil-leakage-prevention pipeline achieves lubricating oil zero negative-pressure cyclic lubrication in oil pocket, can safeguard without the need to tearing machine open by longtime running, greatly reducing maintenance cost.
Description
Technical field
The utility model belongs to machine tool technology field, more particularly, relates to a kind of sliding bearing long service life, lubricating system stable and reliable operation, not easily occurs the easy care peripheral milling of leakage of oil situation.
Background technology
Cylindrical grinder is a kind of is cutter with emery wheel, and column type steel part is ground out the grinding machine of accurate concentricity, it is widely used in Machining of Shaft-type Parts high to required precision in the fields such as automobile engine, military project, space flight.At present, in the use procedure of cylindrical grinder, mainly there is following several respects problem:
First, sliding bearing structure its metal main shaft and the fricative heat of bearing shell in rotation process of traditional cylindrical grinder are quite large, and this heat can make main shaft and bearing shell produce thermal expansion deformation, directly has influence on the precision of main shaft.Due to the existence of thermal expansion deformation factor, if in assembling process, gap between main shaft and bearing shell is adjusted cross primary spindle easy locking and cannot rotate, if gap is adjusted excessive; directly reduce the required precision of main shaft.
Secondly, in the process of sliding bearing, super grinding processing need be carried out to the rubbing surface of metal main shaft and bearing shell, keep the friction position of main shaft smooth, extended the service life of metal main shaft and bearing shell by the coefficient of friction reducing rubbing surface.But super grinding processing technology is extremely loaded down with trivial details, desirable effect can not be reached simultaneously, after using half a year, check that obvious wear trace has still appearred in the friction surface of main shaft and bearing shell, this makes main shaft must adjust once every three months, eliminate its wearing clearance to continue to keep main shaft to the requirement of precision, substantially increase the maintenance cost in later stage, cause the waste of manpower.
In addition, traditional cylindrical grinder adopts rubber seal (O RunddichtringO and Y type seal) to reach lubricating oil in seal oil chamber, prevents the object that lubricating oil outflows.The purchase cost of rubber seal is lower, but its drawback is easily aging, once rubber seal is aging, must take whole mechanism apart more renew seal.So not only in the easy process changing seal, because the maloperation of maintenance personal or barbarous operation cause the damage of miscellaneous part, maintenance operation is also very loaded down with trivial details.Lubricating oil also can because of Long-Time Service and dirty in the space closed, and molecule wear and tear can be distributed to each position that rubs along with lubricating oil, strengthens the wearing and tearing to miscellaneous part, to the serviceability of equipment and aging effects very large.
For the problems referred to above, peripheral milling manufacturer is making great efforts seeking solution always, but it is open to have not yet to see suitable scheme.Through retrieval, Chinese Patent Application No. 200920224574.1, the applying date is on August 19th, 2009, invention and created name is: a kind of journal bearing generating ceramic coating through thermal spraying, the journal bearing of this application case is made up of inner sleeve and overcoat, inside and outside inner-outer sleeve contacts, rubbing surface is provided with one deck ceramic coating, increases the intensity at bearing position easy to wear.This application case aims to provide a kind of wear-resisting, corrosion-resistant, can in helicoid hydraulic motor the journal bearing that uses of long-life, because the instructions for use of this application case in conjunction with helicoid hydraulic motor designs, and be not suitable for promoting the use of on peripheral milling.
Chinese Patent Application No. 201410125827.5, the applying date is on March 31st, 2014, invention and created name is: a kind of power transmission shaft dynamic sealing device, this application case comprises bearing inner race back-up ring, seal cover, gland and oil return pipe, bearing inner race retainer-ring press mounting is on power transmission shaft, the first gap is formed between seal cover and power transmission shaft, the second gap is formed between the left side of bearing inner race back-up ring and seal cover, seal cover is provided with the first spill port, gland is provided with the second spill port, oil return pipe is divided into upper oil return line and lower oil return line by dividing plate, first gap is communicated with upper oil return line by the first spill port, second gap is communicated with lower oil return line by the second spill port.This application case is rotated at power transmission shaft driven gear, when lubricating oil enters from the first gap, a part enters into the first spill port, realize oil return through upper oil return line, during the first spill port oil return scarce capacity, parts of lubricating oil enters into the second gap, enter into lower oil return line through the second spill port and realize oil return, thus achieve shunting oil return, oil leakage can not be caused because lubricating oil return has some setbacks, thus avoid the leakage of oil of motor mudhole.
Chinese Patent Application No. 201120266925.2, the applying date is on July 26th, 2011, invention and created name is: the leak-proof arrangement of large axle bush motor cavity, and this application case is made up of bearing shell, annular oil-recovery tank, sliding bearing sealing ring, axle, sliding bearing sealing gland circle, flexible pipe, wind isolation board, air channel, deep bead, inner chamber, stator.The inwall of bearing shell has annular oil-recovery tank, sliding bearing sealing ring is arranged between bearing shell and axle, sliding bearing sealing gland circle is arranged on bearing shell, deep bead is arranged on stator, be provided with inner chamber between stator and deep bead, flexible pipe one end is connected with deep bead, and the other end is connected with sliding bearing sealing gland circle, wind isolation board is arranged on axle, is provided with air channel between deep bead and axle.This application case has driven annular oil-recovery tank on the inwall of bearing shell, the oil droplet splashing inwall can be made to be included in annular groove, play the effect blocking oil circuit and promote oil return, make oil return more smooth and easy, install dividing plate additional and flexible pipe decreases negative pressure to bearing shell pressure, reach oil tight object, extend the service life of motor.
Above-mentioned application case all proposes avoids motor leakage of oil, extends the scheme in motor service life, but has himself feature in view of cylindrical grinder structure, and above-mentioned leak-proof arrangement designs and is not suitable for cylindrical grinder.
Utility model content
1. the utility model technical problem that will solve
The purpose of this utility model is to solve that existing peripheral milling exists: 1) metal main shaft and bearing shell easily produce thermal expansion deformation because rubbing, and to cause in assembling process gap between main shaft and bearing shell not easily to regulate; 2) in peripheral milling use procedure, because of spindle abrasion, rubber seal problem of aging, frequently need tear machine open large to internal components infringement, later maintenance cost is high, the problem of waste of manpower, provides a kind of peripheral milling being convenient to assemble and safeguard; The utility model coats ceramic coating at the friction position of metal main shaft and bearing shell, utilizes the excellent properties of pottery, solves thermal expansion deformation and the wear problem of metal main shaft; Simultaneously, the utility model abandons the old scheme using rubber seal sealing, according to peripheral milling own structural characteristics, for peripheral milling devises brand-new oil-leakage-prevention pipeline, this oil-leakage-prevention pipeline achieves lubricating oil zero negative-pressure cyclic lubrication in oil pocket, and can safeguard without the need to tearing machine open by longtime running, greatly reduce maintenance cost.
2. technical scheme
For achieving the above object, the technical scheme that the utility model provides is:
A kind of peripheral milling being convenient to assemble and safeguard of the present utility model, comprise sleeve, housing, cover plate, emery wheel and sliding bearing, described housing is arranged at sleeve inner, cover plate for sealing is passed through at the two ends of this housing, described sliding bearing laterally runs through housing, and one end of this sliding bearing is connected with emery wheel; The main shaft of described sliding bearing and the contact site of bearing shell are provided with ceramic coating, and described enclosure interior is provided with return line, and this return line is connected with the grease-box being arranged at sleeve outside, and lubricating oil is zero negative-pressure cyclic circulation in return line.
Further improve as the utility model, described ceramic coating is sprayed on main shaft, and the thickness of this ceramic coating is 0.8 ~ 1.5mm, and hardness is 75 ~ 90HV, and surface roughness is less than 0.1 μm.
Further improve as the utility model, the thickness of described ceramic coating is 1.0 ~ 1.2mm, and hardness is 80HV.
Further improve as the utility model, described return line comprises the first main oil return line, this first main oil return line is embedded in the housing on main shaft top, the oil-out of the first main oil return line is opened in the highest point of the first main oil return line, this oil-out is connected with the flowline of sleeve outer setting, described sleeve outside is also provided with oil inlet pipe, and this oil inlet pipe is positioned at the below of flowline, and oil inlet pipe is connected with the oil-in of the first main oil return line.
Further improve as the utility model, the caliber of described flowline is greater than the caliber of oil inlet pipe.
Further improve as the utility model, described return line also comprises the second oil return line, this second oil return line is embedded in the housing of main shaft bottom, first main oil return line and the second oil return line are separated by oil sealing, described oil sealing comprises stage clip and copper ring, and copper ring is placed on main shaft, and one end of stage clip is against cover plate, the other end of this stage clip is connected with copper ring, and the thrust that the pressured spring of copper ring provides blocks the port of the first main oil return line; The oil return opening of described second oil return line is opened in the lowest part of the second oil return line, and this oil return opening is connected with the oil return pipe of sleeve outer setting.
Further improve as the utility model, described flowline, oil inlet pipe are all connected with grease-box with oil return pipe, are provided with oil strainer between oil inlet pipe and grease-box.
3. beneficial effect
The technical scheme adopting the utility model to provide, compared with existing known technology, has following remarkable result:
(1) a kind of peripheral milling being convenient to assemble and safeguard of the present utility model, it is on the main shaft of sliding bearing, the contact site being specially main shaft and bearing shell is coated with ceramic coating, because pottery itself has surface smoothness and the high advantage of hardness, the heat produced in friction is well below metal main shaft, therefore, well avoid main axis and produce the problem that too much heat causes its thermal expansion deformation, can the gap adjustment between main shaft and bearing shell to less scope in spindle mounted process, assembly difficulty reduces, and main shaft precision is greatly enhanced;
(2) a kind of peripheral milling being convenient to assemble and safeguard of the present utility model, the thickness of design ceramic coating is 1.0 ~ 1.2mm, hardness is 80HV, surface roughness is less than 0.1 μm, the heat distortion amount of ceramic coating under this Parameter Conditions own is little, also be not easy at high operating temperatures to occur main shaft locking phenomenon, its surface roughness also can fully meet low noise in spindle operation process, the requirement of low vibrations, and due to the antiwear characteristic of ceramic coating, the service life of metal main shaft is extended greatly, compared to the conventional master spindle every three months adjustment cycle once, main shaft adjustment cycle after spraying ceramic coat extends to every two years once, greatly reduce maintenance cost,
(3) a kind of peripheral milling being convenient to assemble and safeguard of the present utility model, according to peripheral milling own structural characteristics, innovatively be provided with return line in peripheral milling enclosure interior, lubricating oil can realize zero negative-pressure cyclic circulation in this return line, reaches lubrication object; The more important thing is, this return line peripheral milling longtime running is adopted also to there will not be leakage of oil situation, avoid because conventional rubber seal is easily aging, need the whole equipment replacement seal of dismounting in case leak-stopping is oily, the problems such as the internal components of the mill to foreign round infringement caused is large, maintenance cost is high, improve operational reliability and the efficiency of equipment;
(4) a kind of peripheral milling being convenient to assemble and safeguard of the present utility model, oil return pipeline structure simplicity of design, the improvement cost of peripheral milling is low, easy to utilize.
Accompanying drawing explanation
Fig. 1 is the side view of cylindrical grinding set cylinder in the utility model;
Fig. 2 is the A-A face sectional view of Fig. 1.
Label declaration in schematic diagram:
1, sleeve; 2, housing; 3, cover plate; 4, emery wheel; 51, main shaft; 52, bearing shell; 53, ceramic coating; 61, the first main oil return line; 62, oil sealing; 63, the second oil return line; 71, oil-out; 72, oil return opening; 81, flowline; 82, oil inlet pipe; 83, oil return pipe.
Detailed description of the invention
For understanding content of the present utility model further, in conjunction with the accompanying drawings and embodiments the utility model is described in detail.
Embodiment 1
By reference to the accompanying drawings, a kind of peripheral milling (this peripheral milling is full-automatic numerical control peripheral milling espespecially) being convenient to assemble and safeguard of the present embodiment, comprise sleeve 1, housing 2, cover plate 3, emery wheel 4 and sliding bearing, it is inner that described housing 2 is arranged at sleeve 1, and the two ends of this housing 2 are by cover plate 3 positiver sealing.Described sliding bearing laterally runs through housing 2, and this sliding bearing comprises main shaft 51 and bearing shell 52, and one end of main shaft 51 is connected with the emery wheel 4 of high-speed rotation.The present embodiment is on the main shaft 51 of sliding bearing, be specially the ceramic coating 53 of the contact site spraying 1mm thickness of main shaft 51 and bearing shell 52, utilize the surface smoothness that has of pottery itself and the high advantage of hardness, reduce the heat that main shaft 51 produces in rubbing with bearing shell 52, thus avoid main shaft 51 to rotate because heat production too much occurs thermal expansion deformation problem, in assembling process, 0.01mm can be brought up to by original 0.02mm in the gap between main shaft 51 and bearing shell 52, assembly difficulty reduces, and main shaft precision is more than doubled.
In addition, in the present embodiment, the hardness of ceramic coating 53 is 80HV, and surface roughness is 0.1 μm.The heat distortion amount of ceramic coating 53 of these structural parameters own is little, even if be also not easy at high operating temperatures to occur main shaft locking phenomenon, runs more stable, reliable.The surface smoothness of ceramic coating 53 also fully can meet the requirement of low noise, low vibrations in main shaft 51 operation process, and main shaft 51 operates more smooth and easy, its circular runout also spraying ceramic coat 53 more non-than tradition time be significantly improved.Again due to the antiwear characteristic of ceramic coating 53, the service life of main shaft 51 is extended greatly, compared to the conventional master spindle every three months adjustment cycle once, main shaft 51 adjustment cycle after spraying ceramic coat extends to every two years once, greatly reduce manpower and the time cost of maintenance, improve the service efficiency of equipment reliability and equipment simultaneously.
The present embodiment, except except the contact site spraying ceramic coat 53 of main shaft 51 and bearing shell 52, adopting lubricating oil in rubber seal seal oil chamber for solving traditional peripheral milling, preventing the scheme of peripheral milling leakage of oil.Because rubber seal is easily aging, seal changed by machine of need frequently tearing open, grinds the problems such as internal components infringement is large to foreign round, is provided with return line in housing 2 inside.
Referring to Fig. 2, described return line comprises the first main oil return line 61 and the second oil return line 63, and wherein, the first main oil return line 61 is embedded in the housing 2 on main shaft 51 top, and the second oil return line 63 is embedded in the housing 2 of main shaft 51 bottom.First main oil return line 61 and the second oil return line 63 are separated by oil sealing 62, described oil sealing 62 comprises stage clip and copper ring, copper ring is placed on main shaft 51, one end of stage clip is against cover plate 3, the other end is connected with copper ring, the housing 2 of the thrust that the pressured spring of copper ring provides and the first main oil return line 61 both sides is fitted, and blocks the port of the first main oil return line 61.Because copper ring has wear-resisting, that material is softer advantage, therefore copper ring well can be fitted with housing 2, thus ensure that the reliability of the first main oil return line 61 and the second oil return line 63 separated by oil sealing 62.
Referring to Fig. 1, the oil-out 71 that described sleeve 1 outside sets gradually the main oil return line 61 of flowline 81, oil inlet pipe 82 and oil return pipe 83, first is from top to bottom opened in the highest point of the first main oil return line 61, and this oil-out 71 is connected with flowline 81.The oil-in (not shown) of the first main oil return line 61 is then connected with oil inlet pipe 82.The oil return opening 72 of described second oil return line 63 is opened in the lowest part of the second oil return line 63, and this oil return opening 72 is connected with oil return pipe 83.In the present embodiment, the caliber of flowline 81 is greater than the caliber of oil inlet pipe 82, and flowline 81, oil inlet pipe 82 are all connected with grease-box with oil return pipe 83, are also provided with oil strainer between oil inlet pipe 82 and grease-box.
The present embodiment lubricating oil can realize zero negative-pressure cyclic circulation in return line inside, thus reaches lubrication object, and adopts this return line peripheral milling longtime running also to there will not be leakage of oil situation, and its principle is as follows:
Lubricating oil enters the main oil return line 61 of the first main oil return line 61, first through oil inlet pipe 82 and lubricating oil is delivered to the inner each lubricant housings of peripheral milling, thus reaches lubrication object.Lubricating oil is full of whole first main oil return line 61 gradually, flow out finally by the oil-out 71 being positioned at the first main oil return line 61 highest point, caliber due to flowline 81 is greater than the caliber of oil inlet pipe 82, the fuel-displaced speed of lubricating oil is more than or equal to oil-feed speed, so lubricating oil can realize zero negative-pressure cyclic circulation in the first main oil return line 61.Because though copper ring reliably can be fitted with housing 2, still have a small amount of lubricating oil to overflow, the present embodiment devises the second layer barrier of the second oil return line 63 as sealing, the a small amount of lubricating oil overflowed from the first main oil return line 61 leans on the physical flow characteristic of liquid to flow in the second oil return line 63, flows out finally by oil return pipe 83.Because the lubricating oil refluxed through flowline 81, oil return pipe 83 carries impurity, again circulate so the lubricating oil in grease-box needs first to enter the first main oil return line 61 again through oil strainer filtration.
Embodiment 2
A kind of peripheral milling being convenient to assemble and safeguard of the present embodiment, substantially with embodiment 1, its difference is: in the present embodiment, the thickness of ceramic coating 53 is 0.8mm, and hardness is 90HV, and surface roughness is 0.05 μm.
Embodiment 3
A kind of peripheral milling being convenient to assemble and safeguard of the present embodiment, substantially with embodiment 1, its difference is: in the present embodiment, the thickness of ceramic coating 53 is 1.5mm, and hardness is 75HV, and surface roughness is 0.1 μm.
Embodiment 4
A kind of peripheral milling being convenient to assemble and safeguard of the present embodiment, substantially with embodiment 1, its difference is: in the present embodiment, the thickness of ceramic coating 53 is 1.2mm, and hardness is 80HV, and surface roughness is 0.09 μm.
A kind of peripheral milling being convenient to assemble and safeguard described in embodiment 1 ~ 4, coats ceramic coating 53 at main shaft 51 and the friction position of bearing shell 52, utilizes the excellent properties of pottery, solve thermal expansion deformation and the wear problem of main shaft 51; Simultaneously, abandon the old scheme using rubber seal sealing, prevent leakage of oil, according to peripheral milling own structural characteristics, for peripheral milling devises brand-new oil-leakage-prevention pipeline, this oil-leakage-prevention pipeline structure simplicity of design makes the improvement cost of peripheral milling low, achieve lubricating oil zero negative-pressure cyclic lubrication in oil pocket simultaneously, and can safeguard without the need to tearing machine open by longtime running, greatly reduce maintenance cost.
Schematically above be described the utility model and embodiment thereof, this description does not have restricted, and also just one of the embodiment of the present utility model shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the utility model and creating aim, design the frame mode similar to this technical scheme and embodiment without creationary, protection domain of the present utility model all should be belonged to.
Claims (7)
1. the peripheral milling be convenient to assembling and safeguarded, comprise sleeve (1), housing (2), cover plate (3), emery wheel (4) and sliding bearing, it is inner that described housing (2) is arranged at sleeve (1), the two ends of this housing (2) are by cover plate (3) sealing, described sliding bearing laterally runs through housing (2), and one end of this sliding bearing is connected with emery wheel (4); It is characterized in that: the main shaft (51) of described sliding bearing and the contact site of bearing shell (52) are provided with ceramic coating (53), described housing (2) inside is provided with return line, this return line is connected with the grease-box being arranged at sleeve (1) outside, and lubricating oil is zero negative-pressure cyclic circulation in return line.
2. a kind of peripheral milling being convenient to assemble and safeguard according to claim 1, it is characterized in that: described ceramic coating (53) is sprayed on main shaft (51), the thickness of this ceramic coating (53) is 0.8 ~ 1.5mm, hardness is 75 ~ 90HV, and surface roughness is less than 0.1 μm.
3. a kind of peripheral milling being convenient to assemble and safeguard according to claim 2, is characterized in that: the thickness of described ceramic coating (53) is 1.0 ~ 1.2mm, and hardness is 80HV.
4. a kind of peripheral milling being convenient to assemble and safeguard according to claim 1, it is characterized in that: described return line comprises the first main oil return line (61), this first main oil return line (61) is embedded in the housing (2) on main shaft (51) top, the oil-out (71) of the first main oil return line (61) is opened in the highest point of the first main oil return line (61), this oil-out (71) is connected with the flowline (81) of sleeve (1) outer setting, described sleeve (1) outside is also provided with oil inlet pipe (82), this oil inlet pipe (82) is positioned at the below of flowline (81), oil inlet pipe (82) is connected with the oil-in of the first main oil return line (61).
5. a kind of peripheral milling being convenient to assemble and safeguard according to claim 4, is characterized in that: the caliber of described flowline (81) is greater than the caliber of oil inlet pipe (82).
6. a kind of peripheral milling being convenient to assemble and safeguard according to claim 4 or 5, it is characterized in that: described return line also comprises the second oil return line (63), this second oil return line (63) is embedded in the housing (2) of main shaft (51) bottom, first main oil return line (61) and the second oil return line (63) are separated by oil sealing (62), described oil sealing (62) comprises stage clip and copper ring, copper ring is placed on main shaft (51), one end of stage clip is against cover plate (3), the other end of this stage clip is connected with copper ring, the thrust that the pressured spring of copper ring provides blocks the port of the first main oil return line (61), the oil return opening (72) of described second oil return line (63) is opened in the lowest part of the second oil return line (63), and this oil return opening (72) is connected with the oil return pipe (83) of sleeve (1) outer setting.
7. a kind of peripheral milling being convenient to assemble and safeguard according to claim 6, it is characterized in that: described flowline (81), oil inlet pipe (82) are all connected with grease-box with oil return pipe (83), are provided with oil strainer between oil inlet pipe (82) and grease-box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520190583.9U CN204504916U (en) | 2015-03-31 | 2015-03-31 | A kind of peripheral milling being convenient to assemble and safeguard |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520190583.9U CN204504916U (en) | 2015-03-31 | 2015-03-31 | A kind of peripheral milling being convenient to assemble and safeguard |
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| CN204504916U true CN204504916U (en) | 2015-07-29 |
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| CN201520190583.9U Expired - Fee Related CN204504916U (en) | 2015-03-31 | 2015-03-31 | A kind of peripheral milling being convenient to assemble and safeguard |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690613A (en) * | 2015-03-31 | 2015-06-10 | 马鞍山市恒利达机械刀片有限公司 | Cylindrical grinder easy to assemble and maintain |
| CN114178631A (en) * | 2021-12-09 | 2022-03-15 | 中国船舶重工集团公司第七0三研究所 | Pneumatic type spiral spline grinder |
-
2015
- 2015-03-31 CN CN201520190583.9U patent/CN204504916U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690613A (en) * | 2015-03-31 | 2015-06-10 | 马鞍山市恒利达机械刀片有限公司 | Cylindrical grinder easy to assemble and maintain |
| CN104690613B (en) * | 2015-03-31 | 2017-02-22 | 马鞍山市恒利达机械刀片有限公司 | Cylindrical grinder easy to assemble and maintain |
| CN114178631A (en) * | 2021-12-09 | 2022-03-15 | 中国船舶重工集团公司第七0三研究所 | Pneumatic type spiral spline grinder |
| CN114178631B (en) * | 2021-12-09 | 2024-04-09 | 中国船舶重工集团公司第七0三研究所 | Pneumatic spiral spline grinding device |
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Granted publication date: 20150729 Termination date: 20190331 |