JPH0526176A - Uniaxial eccentric screw pump stator inner surface polishing method - Google Patents
Uniaxial eccentric screw pump stator inner surface polishing methodInfo
- Publication number
- JPH0526176A JPH0526176A JP17928891A JP17928891A JPH0526176A JP H0526176 A JPH0526176 A JP H0526176A JP 17928891 A JP17928891 A JP 17928891A JP 17928891 A JP17928891 A JP 17928891A JP H0526176 A JPH0526176 A JP H0526176A
- Authority
- JP
- Japan
- Prior art keywords
- stator
- polishing tool
- polishing
- eccentric screw
- uniaxial eccentric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
- F04C2/1075—Construction of the stationary member
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Rotary Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、特に粘性の高い流体の
輸送に好適な一軸偏心ねじポンプにおける、ステ−タ内
面の研磨方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for polishing the inner surface of a stator in a uniaxial eccentric screw pump suitable for transporting a highly viscous fluid.
【０００２】[0002]
【従来の技術】一軸偏心ねじポンプは粘性の高い流体で
も圧送でき、定量性があるという特長を有しているた
め、オイルや塗料、パルプ液などの高粘性流体や薬液、
食品などの圧送に使用されている。2. Description of the Related Art A uniaxial eccentric screw pump has the feature that it can pump even highly viscous fluids and has quantitative properties. Therefore, highly viscous fluids such as oil, paints, pulp fluids, chemical liquids, etc.
It is used to pump food products.
【０００３】このような一軸偏心ねじポンプの構造は、
図３に示すように、回転軸に対して偏心した円形断面を
有する雄ねじ状のロータ２を、長円形断面を有し、ピッ
チがロ−タ２の２倍である雌ねじ状の内面を形成したス
テ−タ１に内装し、前記ロータ２には二つのユニバーサ
ルジョイント３、３およびコネクティングロッド４を介
してシャフト５が連結され、軸封部６でシールされてい
た。該シャフト５を回転させれば、前記ロータ２は回転
軸を中心として回転すると共に、固定されたステ−タ１
の軸心に対して偏心運動を行うことによって流体を吸込
口７から吐出口８へ圧送できるようになっていた。The structure of such a uniaxial eccentric screw pump is as follows.
As shown in FIG. 3, an externally threaded rotor 2 having a circular cross section eccentric to the rotation axis has an oval cross section, and an internal surface of an internal thread having a pitch twice that of the rotor 2 is formed. A shaft 5 is connected to the rotor 1 via two universal joints 3 and 3 and a connecting rod 4 and is sealed by a shaft sealing portion 6 inside the stator 1. When the shaft 5 is rotated, the rotor 2 rotates about the rotation axis and the fixed stator 1 is rotated.
The fluid can be pumped from the suction port 7 to the discharge port 8 by performing an eccentric movement with respect to the axis center of.
【０００４】また、ステ−タ１は金属、ゴムなどから形
成されており、ロ−タ２、コネクティングロッド４、シ
ャフト５などはすべて金属からなっていたが、近年、ス
テ−タ１をセラミックスにより形成し、高温流体や腐食
性流体を圧送でき摩耗を少なくするようにした一軸偏心
ねじポンプが開発されてきた。The stator 1 is made of metal or rubber, and the rotor 2, the connecting rod 4, the shaft 5 and the like are all made of metal. In recent years, the stator 1 is made of ceramics. Uniaxial eccentric screw pumps have been developed that are formed to pump hot fluids and corrosive fluids and reduce wear.
【０００５】このステ−タ１の内面形状は、長円形を回
転させた雌ねじ状となっており、セラミックスで形成す
る場合は、内面形状と同形状の中金型を用いて、ラバ−
プレス、鋳込みなどによって成形した後、焼結するよう
になっていた（特開昭62-29781号公報参照）。また、ス
テータ１内面の精度を向上するために、内面と同形状
で、かつ先細状の総形砥石を用いて研削する方法を本出
願人は既に提案した（特願平１−２２５５４０号参
照）。The inner surface of the stator 1 has a female screw shape obtained by rotating an oval. When it is made of ceramics, a rubber mold is used by using a middle die having the same shape as the inner surface.
After being formed by pressing, casting, etc., it was designed to be sintered (see JP-A-62-29781). Further, in order to improve the accuracy of the inner surface of the stator 1, the present applicant has already proposed a method of grinding using a tapered grindstone having the same shape as the inner surface (see Japanese Patent Application No. 1-225540). .
【０００６】[0006]
【発明が解決しようとする課題】ところが上記の如き総
形砥石による研削では、ステ−タ１の内面に研削キズが
残り、面の仕上りが悪いという欠点があった。たとえ
ば、ステ−タ１を総形砥石で研削した場合、内面の表面
粗さが５ｓとなり、ロ−タ２、ステ−タ１の耐久性が悪
くなるといった問題点があった。However, the above-described grinding with the general-purpose grindstone has a drawback in that grinding scratches remain on the inner surface of the stator 1 and the surface finish is poor. For example, when the stator 1 is ground by a grindstone, the surface roughness of the inner surface becomes 5 s, and the durability of the rotor 2 and the stator 1 deteriorates.
【０００７】この問題点を解消するためには、前記研削
後のステ−タ１の内面に仕上げ研磨を施せば良いが、複
雑な形状であるため、容易に精度よく研磨する方法がな
かった。In order to solve this problem, the inner surface of the stator 1 after the grinding may be subjected to finish polishing, but since it has a complicated shape, there is no method for easily and accurately polishing.
【０００８】[0008]
【課題を解決するための手段】上記に鑑みて本発明は、
セラミックスからなる一軸偏心ねじポンプ用ステ−タ
に、該ステ−タに用いるロ−タと同形状で、かつ表面が
樹脂からなり、直径がステータ短径よりも大きい研磨具
を挿入し、該研磨具またはステータを回転させながら、
研磨剤と粘性液の混合したスラリ−液を循環圧送して研
磨するようにしたものである。In view of the above, the present invention provides:
A uniaxial eccentric screw pump stator made of ceramics was inserted with a polishing tool having the same shape as the rotor used for the stator and having a surface made of resin and a diameter larger than the minor axis of the stator. While rotating the tool or stator,
A slurry liquid in which an abrasive and a viscous liquid are mixed is circulated under pressure for polishing.
【０００９】[0009]
【実施例】以下図面を参照して本発明の実施例を説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１において、１は一軸偏心ねじポンプ用
のステータであり、アルミナ、窒化珪素などのセラミッ
クスからなっている。このステータ１に総形砥石などを
用いて研削加工を施した後、図１に示すように保持部材
２３に固定する。また、研磨具２２は、前記ステ−タ１
に用いるロ−タ２と同形状であり、金属からなる基体の
表面に、ＮＢＲ樹脂などのロックウェル硬度３０〜７０
の樹脂を厚み５〜１０ｍｍとなるようにコ−ティングし
たものであって、ステータ１の短径よりも大きな直径を
もっている。この研磨具２２をステ−タ１の内面に挿入
して回転させながら、ＧＣ砥粒、珪藻土等からなる研磨
剤とＣＭＣ等からなる粘性液の混合したスラリ−液２４
を循環圧送すればよい。このようにすれば、研磨具２２
は自転しながら偏心回転し、ステータ１の内面を研磨す
ることができる。また、研磨具２２の表面が樹脂からな
り、かつその直径がステータ１の内面よりやや大きいた
め、研磨具２２の表面がステータ１内面に密着し、完全
に研磨することができる。In FIG. 1, reference numeral 1 is a stator for a uniaxial eccentric screw pump, which is made of ceramics such as alumina and silicon nitride. The stator 1 is ground using a grindstone or the like, and then fixed to a holding member 23 as shown in FIG. The polishing tool 22 is the stator 1
The same shape as the rotor 2 used for the above, and the Rockwell hardness of NBR resin or the like is 30 to 70 on the surface of the substrate made of metal.
Is coated with a resin having a thickness of 5 to 10 mm and has a diameter larger than the minor axis of the stator 1. While the polishing tool 22 is inserted into the inner surface of the stator 1 and rotated, a slurry liquid 24 in which a polishing agent composed of GC abrasive grains, diatomaceous earth or the like and a viscous liquid composed of CMC or the like are mixed.
Circulation pressure may be used. In this way, the polishing tool 22
Rotates eccentrically while rotating, and can polish the inner surface of the stator 1. Further, since the surface of the polishing tool 22 is made of resin and the diameter thereof is slightly larger than the inner surface of the stator 1, the surface of the polishing tool 22 is in close contact with the inner surface of the stator 1 and can be completely polished.
【００１１】なお、図２に断面図を示すように、上記研
磨具２２の直径ｄはステータ１の短径Ｄよりもやや大き
くしてあるが、この直径ｄを種々に変化させて研磨実験
を行ったところ、研磨具２２の直径ｄがステータ１の短
径Ｄ＋１ｍｍより大きいと、研磨具２２をステータ１に
挿入しにくく、研磨時のトルクが大きいものであった。
また、逆に研磨具２２の直径ｄがステータ１の短径Ｄ＋
０．５ｍｍより小さいと、内面を完全に研磨することが
困難であった。したがって、研磨具２２の直径ｄはステ
ータ１の短径Ｄよりも０．５〜１ｍｍ大きいものが良か
った。As shown in the cross-sectional view of FIG. 2, the diameter d of the polishing tool 22 is slightly larger than the minor diameter D of the stator 1. However, the diameter d is variously changed to carry out polishing experiments. As a result, when the diameter d of the polishing tool 22 was larger than the minor axis D + 1 mm of the stator 1, it was difficult to insert the polishing tool 22 into the stator 1 and the torque during polishing was large.
On the contrary, the diameter d of the polishing tool 22 is the minor axis D + of the stator 1.
If it is less than 0.5 mm, it is difficult to completely polish the inner surface. Therefore, the diameter d of the polishing tool 22 is preferably 0.5 to 1 mm larger than the minor diameter D of the stator 1.
【００１２】また、上記スラリー液２４中に混入する研
磨剤の粒径を種々に変化させて同様の試験を行ったとこ
ろ、粒径が１μｍより小さいと研磨時間が長くなり、一
方粒径が１０μｍより大きいと内面を滑らかにすること
ができなかった。したがって、研磨剤の粒径は１〜１０
μｍのものが良かった。そして、このような研磨剤を用
いることによって、ステータ１の内面を表面粗さ１ｓと
することができた。Further, the same test was carried out by changing the particle size of the abrasive mixed in the slurry liquid 24 variously. When the particle size is less than 1 μm, the polishing time becomes longer, while the particle size is 10 μm. If it is larger, the inner surface cannot be smoothed. Therefore, the particle size of the abrasive is 1-10.
The one with μm was good. Then, by using such an abrasive, the inner surface of the stator 1 could have a surface roughness of 1 s.
【００１３】さらに、本発明の研磨方法において、研磨
具２２の軸に取り付けたトルク計、または、モ−タ入力
を測定することによって回転トルクを監視し、規定のト
ルクに達した時点で研磨終了とすればよい。即ち、研磨
初期はトルクが大きいが、研磨が進むにつれて内面が滑
らかになってトルクが低下するため、あらかじめ必要な
表面粗さの時のトルクを測定しておいて、このトルクと
なった時点で研磨を終了すればよい。このようにすれ
ば、セラミックスの種類や研磨条件にかかわらず、求め
る表面粗さのステータ１を容易に得ることができる。Further, in the polishing method of the present invention, the rotational torque is monitored by measuring a torque meter attached to the shaft of the polishing tool 22 or a motor input, and polishing is completed when the specified torque is reached. And it is sufficient. That is, although the torque is large in the initial stage of polishing, the inner surface becomes smoother and the torque decreases as the polishing progresses.Therefore, the torque at the required surface roughness is measured in advance, and when this torque is reached, It suffices to finish the polishing. By doing so, the stator 1 having the required surface roughness can be easily obtained regardless of the type of ceramics and the polishing conditions.
【００１４】さらに、上記実施例ではステータ１を固定
し、研磨具２２を回転させる方法を示したが、逆に研磨
具２２を固定し、ステータ１を回転させることもでき
る。あるいは、双方を互いに回転させることによって短
時間で研磨することもできる。Further, in the above embodiment, the method of fixing the stator 1 and rotating the polishing tool 22 has been described, but conversely, the polishing tool 22 may be fixed and the stator 1 may be rotated. Alternatively, they can be polished in a short time by rotating both of them.
【００１５】実験例
ステータ１として窒化珪素質セラミックスからなるもの
を用意し、このステータ１の内面に総形砥石を用いて内
面研削を施した後、本発明の研磨方法によって研磨を施
した。研磨剤として粒径５μｍのＧＣ砥粒を用い、研磨
具２２の直径はステータ１内面の短径よりも０．８ｍｍ
大きくし、ロックウェル硬度６５のＮＢＲ樹脂からなる
コーティングを施して、この研磨具２２の回転数３００
ｒｐｍで、１０時間研磨した。このようにして得られた
ステータ（本発明実施例）と、総形砥石による内面研削
のみのステータ（比較例）について、内面の表面粗さを
測定した後、それぞれ図２の一軸偏心ねじポンプに組み
込んで、使用試験を行った。試験は、ロータの回転数３
００ｒｐｍで珪藻土の圧送を４０時間行った後、初期状
態に対する締切圧の比を測定した。 Experimental Example A stator 1 made of silicon nitride ceramics was prepared, and the inner surface of the stator 1 was internally ground with a grindstone and then polished by the polishing method of the present invention. GC abrasive grains having a particle size of 5 μm were used as the abrasive, and the diameter of the polishing tool 22 was 0.8 mm smaller than the minor diameter of the inner surface of the stator 1.
The number of rotations of the polishing tool 22 is set to 300 by enlarging and coating the NBR resin with Rockwell hardness of 65.
Polished at rpm for 10 hours. After measuring the surface roughness of the inner surface of the stator thus obtained (Example of the present invention) and the stator of only inner surface grinding with the use of a grindstone (Comparative Example), the uniaxial eccentric screw pump shown in FIG. 2 was used. It was incorporated and a usage test was conducted. The test is the number of rotor revolutions 3
After the diatomaceous earth was pumped at 00 rpm for 40 hours, the ratio of the dead pressure to the initial state was measured.
【００１６】結果は表１に示す通り、比較例ではステー
タ１の内面の表面粗さが５ｓと大きいため、使用中にス
テータ１やロータ２が磨耗しやすく、締切圧が７３％に
低下した。これに対し、本発明実施例は、ステータ１の
内面の表面粗さを１ｓと小さくできるため、締切圧の低
下が全くなかった。したがって、本発明の研磨方法を行
うことによって、一軸偏心ねじポンプの耐久性を向上で
きることがわかる。As shown in Table 1, in the comparative example, since the inner surface of the stator 1 had a large surface roughness of 5 s, the stator 1 and the rotor 2 were easily worn during use, and the shutoff pressure dropped to 73%. On the other hand, in the example of the present invention, the surface roughness of the inner surface of the stator 1 can be made as small as 1 s, so that the shutoff pressure did not decrease at all. Therefore, it is understood that the durability of the uniaxial eccentric screw pump can be improved by performing the polishing method of the present invention.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【発明の効果】このように本発明によれば、セラミック
スからなる一軸偏心ねじポンプ用ステ−タに、該ステ−
タに用いるロ−タと同形状で、かつ表面が樹脂からな
り、直径が大きい研磨具を挿入し、該研磨具またはステ
−タを回転させながら、研磨剤と粘性液の混合スラリ−
液を循環圧送して研磨することによって、複雑な形状を
したステ−タの内面を容易にかつ高精度に研磨すること
が可能となり、その結果優れた耐久性をもったセラミッ
クス製一軸偏心ねじポンプを容易に製造することができ
る。As described above, according to the present invention, a stator for a uniaxial eccentric screw pump made of ceramics is provided.
A slurry having the same shape as the rotor used for the rotor and having a large diameter and made of resin and having a large diameter is inserted, and the slurry and the viscous liquid are mixed while rotating the polishing tool or the stator.
By circulating and pumping the liquid for polishing, the inner surface of a stator having a complicated shape can be easily and accurately polished, and as a result, a ceramic uniaxial eccentric screw pump with excellent durability is provided. Can be easily manufactured.
【図１】本発明の一軸偏心ねじポンプのステ−タ内面研
磨方法を説明するための断面図である。FIG. 1 is a cross-sectional view for explaining a method for polishing an inner surface of a stator of a uniaxial eccentric screw pump according to the present invention.
【図２】図１中のＸ−Ｘ線断面図である。FIG. 2 is a sectional view taken along line XX in FIG.
【図３】一軸偏心ねじポンプの構造を示す断面図であ
る。FIG. 3 is a sectional view showing the structure of a uniaxial eccentric screw pump.
１・・・ステータ ２・・・ロータ ３・・・ユニバーサルジョイント ４・・・コネクティングロッド ５・・・シャフト ６・・・軸封部 ７・・・吸込口 ８・・・吐出口 ２２・・・研磨具 ２３・・・保持部材 ２４・・・スラリ−液 1 ... Stator 2 ... rotor 3 ... Universal joint 4 ... Connecting rod 5 ... Shaft 6 ... shaft seal 7 ... Suction port 8 ... Discharge port 22 ... Polishing tool 23 ... Holding member 24 ... Slurry liquid
Claims (2)
なる一軸偏心ねじポンプ用ステ−タに、該ステ−タに用
いるロ−タと同形状で、表面が樹脂からなり、かつその
直径がステータ短径よりも大きい研磨具を挿入し、該研
摩具または上記ステ−タを回転させつつ、研磨剤と粘性
液とから成るスラリ−液を圧送循環しながら研磨するこ
とを特徴とする一軸偏心ねじポンプのステ−タ内面研磨
方法。1. A stator for a uniaxial eccentric screw pump made of ceramics having a female screw-shaped inner surface, the rotor having the same shape as that of the stator, the surface being made of resin, and the diameter being the stator. A uniaxial eccentric screw characterized in that a polishing tool having a diameter smaller than the short diameter is inserted, and the polishing tool or the above-mentioned stator is rotated and a slurry liquid composed of an abrasive and a viscous liquid is pumped and circulated. Pump inner surface polishing method.
検知し、この回転トルクが一定値となったときに研摩を
終了することを特徴とする請求項１記載の一軸偏心ねじ
ポンプのステ−タ内面研磨方法。2. A uniaxial eccentric screw pump stage according to claim 1, wherein the rotation torque of the polishing tool or the stator is detected, and the polishing is terminated when the rotation torque reaches a constant value. -A method for polishing the inner surface of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17928891A JP3004087B2 (en) | 1991-07-19 | 1991-07-19 | Polishing method for inner surface of stator of uniaxial eccentric screw pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17928891A JP3004087B2 (en) | 1991-07-19 | 1991-07-19 | Polishing method for inner surface of stator of uniaxial eccentric screw pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0526176A true JPH0526176A (en) | 1993-02-02 |
| JP3004087B2 JP3004087B2 (en) | 2000-01-31 |
Family
ID=16063211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17928891A Expired - Fee Related JP3004087B2 (en) | 1991-07-19 | 1991-07-19 | Polishing method for inner surface of stator of uniaxial eccentric screw pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3004087B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979717A (en) * | 2012-12-18 | 2013-03-20 | 宁波正鼎石油机械设备制造有限公司 | Full-metal high-temperature-resistant screw pump |
| CN102979718A (en) * | 2012-12-18 | 2013-03-20 | 宁波正鼎石油机械设备制造有限公司 | Full-metal high-temperature-resistant screw pump |
| WO2014184067A1 (en) * | 2013-05-14 | 2014-11-20 | University Of Ljubljana | Arrangements and methods for abrasive flow machining |
| CN107866729A (en) * | 2017-10-30 | 2018-04-03 | 首都航天机械公司 | A kind of titanium alloy pipe fitting inner wall powder minimizing technology and fixture |
| CN113953934A (en) * | 2021-11-11 | 2022-01-21 | 格力电器（武汉）有限公司 | Rotor coating pre-grinding device and pre-grinding method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102271056B1 (en) | 2019-12-04 | 2021-06-30 | 송병규 | A Eccentric Connector For Hot And Cold Water Mixing Faucets |
-
1991
- 1991-07-19 JP JP17928891A patent/JP3004087B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979717A (en) * | 2012-12-18 | 2013-03-20 | 宁波正鼎石油机械设备制造有限公司 | Full-metal high-temperature-resistant screw pump |
| CN102979718A (en) * | 2012-12-18 | 2013-03-20 | 宁波正鼎石油机械设备制造有限公司 | Full-metal high-temperature-resistant screw pump |
| CN102979717B (en) * | 2012-12-18 | 2015-08-05 | 宁波正鼎石油机械设备制造有限公司 | A kind of Full-metal high-temperature-resscrewt screwt pump |
| CN102979718B (en) * | 2012-12-18 | 2015-09-30 | 宁波正鼎石油机械设备制造有限公司 | A kind of Full-metal high-temperature-resscrewt screwt pump |
| WO2014184067A1 (en) * | 2013-05-14 | 2014-11-20 | University Of Ljubljana | Arrangements and methods for abrasive flow machining |
| CN107866729A (en) * | 2017-10-30 | 2018-04-03 | 首都航天机械公司 | A kind of titanium alloy pipe fitting inner wall powder minimizing technology and fixture |
| CN113953934A (en) * | 2021-11-11 | 2022-01-21 | 格力电器（武汉）有限公司 | Rotor coating pre-grinding device and pre-grinding method |
| CN113953934B (en) * | 2021-11-11 | 2024-05-24 | 格力电器（武汉）有限公司 | Rotor coating premounting device and premounting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3004087B2 (en) | 2000-01-31 |
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| LAPS | Cancellation because of no payment of annual fees |