CN111255632B - Method for replacing yaw hydraulic brake of wind turbine generator - Google Patents
Method for replacing yaw hydraulic brake of wind turbine generator Download PDFInfo
- Publication number
- CN111255632B CN111255632B CN202010104289.7A CN202010104289A CN111255632B CN 111255632 B CN111255632 B CN 111255632B CN 202010104289 A CN202010104289 A CN 202010104289A CN 111255632 B CN111255632 B CN 111255632B
- Authority
- CN
- China
- Prior art keywords
- hydraulic brake
- speed reducer
- screw rod
- yaw hydraulic
- yaw
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 73
- 238000009434 installation Methods 0.000 claims abstract description 3
- 230000001681 protective effect Effects 0.000 claims description 16
- 230000005484 gravity Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009194 climbing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0204—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor for orientation in relation to wind direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0244—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor for braking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/50—Maintenance or repair
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a method for replacing a yawing hydraulic brake of a wind turbine generator, which comprises the following steps of removing a foundation bolt connected with the yawing hydraulic brake, and mounting a support rod in a screw hole; the supporting rod is in threaded connection with a speed reducer, the speed reducer is driven by a speed reducer coupler to ascend along the supporting rod and contact with the yaw hydraulic brake; removing the rest foundation bolts, driving the speed reducer to move downwards along the supporting rod through the speed reducer coupler, moving the yaw hydraulic brake downwards along with the speed reducer coupler, and removing the yaw hydraulic brake from the supporting rod; sleeving a new yaw hydraulic brake on the supporting rod, enabling the speed reducer to be in threaded connection with the supporting rod, driving the speed reducer to ascend along the supporting rod, firstly installing the rest foundation bolts after the speed reducer pushes the new yaw hydraulic brake to ascend to the installation position, detaching the speed reducer and the supporting rod, installing the last foundation bolt, screwing up all the foundation bolts, and finishing the replacement of the yaw hydraulic brake. The replacement method can effectively shorten the fault processing time, improve the equipment availability ratio and avoid potential safety hazards.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and relates to a method for replacing a yaw hydraulic brake of a wind turbine generator.
Background
And (4) frequently leaking oil for the yaw hydraulic brake of the wind turbine generator and replacing the yaw hydraulic brake. Because its weight is big, the area of exerting oneself is little, the mounted position is high relatively, needs 3 people at least cooperative work, and the change in-process needs artifical long-time lifts, and the brake body surface adheres to hydraulic oil, and the surface is smooth, and there is the potential safety hazard in the manual work lift. The equipment failure time is high, the safe and stable operation of the wind turbine generator equipment is seriously influenced, the maintenance cost of the wind turbine generator equipment is increased, and the economic benefit of the wind turbine generator equipment is reduced.
Disclosure of Invention
The invention aims to provide a method for replacing a yaw hydraulic brake of a wind turbine generator, which can avoid potential safety hazards and reduce equipment failure time.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for replacing a yaw hydraulic brake of a wind turbine generator specifically comprises the following steps:
1) taking a replacing tool, wherein the replacing tool comprises a speed reducer, a speed reducer coupler, an electric wrench, a sleeve head and a support rod formed by fixedly connecting a screw rod and a screw rod;
2) dismantling one foundation bolt connected with a yaw hydraulic brake on the yaw system, then penetrating a screw into a connecting hole on the yaw hydraulic brake after dismantling the foundation bolt, and screwing the screw into a screw hole after dismantling the foundation bolt;
3) aligning a screw hole on the speed reducer with the screw rod, and manually rotating the speed reducer to enable the speed reducer to be in threaded connection with the screw rod; the speed reducer coupler is driven to rotate by the electric wrench, so that the speed reducer rises to the lower end of the yaw hydraulic brake along the screw rod and is in contact with the yaw hydraulic brake;
4) dismantling the rest foundation bolts connected with the yaw hydraulic brake, and supporting the yaw hydraulic brake by the speed reducer; the speed reducer coupler is driven to rotate reversely by the electric wrench, so that the speed reducer moves downwards along the screw rod, the yaw hydraulic brake moves downwards along with the speed reducer under the action of self gravity in the downward moving process of the speed reducer, the yaw hydraulic brake is supported after the speed reducer moves downwards to the lower end of the screw rod, the electric wrench continues to work, and the speed reducer continues to move downwards and is separated from the screw rod;
5) supporting a new yaw hydraulic brake, sleeving a connecting hole in the new yaw hydraulic brake on a screw rod, moving the new yaw hydraulic brake upwards to expose the end of the screw rod, and connecting a speed reducer with the screw rod in a threaded manner;
6) the speed reducer coupler is driven to rotate through the electric wrench, so that the speed reducer rises along the screw rod, and when the yaw hydraulic brake moves upwards to the mounting position of the yaw hydraulic brake, the electric wrench stops working;
7) and firstly installing other foundation bolts connected with a new yaw hydraulic brake, then detaching the speed reducer from the screw rod, screwing out the screw rod, screwing in the foundation bolts in the screw holes of the screwed-out screw rod, screwing up all the foundation bolts, and finishing the replacement of the yaw hydraulic brake.
The replacing method of the invention has the following advantages:
1) the cost is saved, the working efficiency is improved, when the yaw hydraulic brake is replaced by adopting the prior art, 4 persons are matched with each other for 4 hours to complete the replacement, and after the replacement method is adopted, only 2 persons are needed to complete the replacement for 2 hours; by adopting the replacement method, the labor of 2 persons is saved, the time of 2 hours is saved, the labor cost is saved by 24000 yuan according to the condition that 300 yuan is manually operated per day and the rated power generation of one fan is 2000 kilowatts per hour, the wind farm Jingfar is stopped for 80 times because the yaw hydraulic brake is damaged one year, and the economic benefit is generated by 185600 yuan according to the calculation of 0.58 yuan per watt when the power is generated for 320000 kilowatts more, and the total is 209600 yuan.
2) The replacement tool adopted in the replacement method is safe and reliable, the yaw hydraulic brake is stably lifted and fixed, and the assembly and disassembly are convenient. The vertical cross-sectional area of the used replacement tool is light, and the working position can be easily arranged through a machine set object hanging hole and a ladder climbing port. The problem of driftage hydraulic brake surface adhesion hydraulic oil and heavy object area of exerting oneself little, artifical difficult lift is solved. The potential safety hazard caused by human fatigue is avoided.
3) The replacement method can effectively shorten the time for processing the oil leakage fault of the wind turbine yaw hydraulic brake and improve the equipment availability; the used replacement tool is not limited to the wind generating set of the same set, and is also suitable for other wind generating sets with yaw hydraulic brakes.
Drawings
Fig. 1 is a diagram showing a state of use of a replacement tool used in the replacement method of the present invention.
In the figure: 1. the hydraulic brake device comprises a screw, a screw rod, a lead screw, a protective sleeve, a yaw hydraulic brake, a speed reducer coupler, an electric wrench, a sleeve head and a connecting hole, wherein the screw rod is 2, the lead screw is 3, the protective sleeve is 4, the yaw hydraulic brake is 5, the speed reducer is 6, the speed reducer coupler is 7, the electric wrench is 8, and the sleeve head is 9.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The problem of current situation that equipment fault time is high due to time used for processing oil leakage fault of a wind turbine yaw hydraulic brake in the prior art is solved. The invention provides a method for replacing a yaw hydraulic brake, which can shorten the fault processing time and is specifically carried out according to the following steps:
1) taking a replacing tool, wherein the replacing tool comprises a speed reducer 5, a speed reducer coupler 6, an electric wrench 7, a sleeve head 8 and a support rod formed by fixedly connecting a screw rod 1 and a screw rod 2, and the outer diameter of the screw rod 1 is larger than that of the screw rod 2;
2) firstly, removing one foundation bolt connected with a yaw hydraulic brake 4 on a yaw system, then penetrating a screw rod 1 into a connecting hole 9 on the yaw hydraulic brake 4 after the foundation bolt is removed, and screwing the screw rod 1 into a screw hole after the foundation bolt is removed, wherein at the moment, a screw rod 2 extends out of the connecting hole 9, as shown in figure 1;
3) sleeving a protective sleeve 3 on a screw rod 2, enabling the protective sleeve 3 to penetrate into a connecting hole 9, aligning a screw hole on a speed reducer 5 (SWL, 1T speed reducer manufactured by Otton mechanical equipment (Shandong) Co., Ltd.) to the screw rod 2, and manually rotating the speed reducer 5 to enable the speed reducer 5 to be in threaded connection with the screw rod 2; then an electric wrench 7 with a sleeve head 8 with a diameter of 22mm is used for driving a speed reducer coupler 6 to rotate, so that a speed reducer 5 rises to the lower end of a yaw hydraulic brake 4 along a screw rod 2, and the speed reducer 5 is in contact with the yaw hydraulic brake 4;
4) dismantling the rest foundation bolts connected with the yaw hydraulic brake 4, and at the moment, supporting the yaw hydraulic brake 4 by the speed reducer 5; the electric wrench 7 drives the speed reducer coupler 6 to rotate reversely, so that the speed reducer 5 moves downwards along the screw rod 2, in the process of downwards moving the speed reducer 5, the yaw hydraulic brake 4 moves downwards along with the speed reducer 5 under the action of self gravity, the protective sleeve 3 is driven to move downwards, after the speed reducer moves downwards to the lower end of the screw rod 2, one person holds the yaw hydraulic brake 4 with both hands, the other person continues to operate the electric wrench 7 so that the speed reducer 5 continues to be separated from the screw rod 2 downwards, and the person holding the yaw hydraulic brake 4 with both hands takes down the yaw hydraulic brake 4 and the protective sleeve 3 and places the yaw hydraulic brake and the protective sleeve 3 on a yaw platform;
5) one person holds a new yaw hydraulic brake 4 with two hands, a connecting hole 9 in the new yaw hydraulic brake 4 is sleeved on the screw rod 2, the protective sleeve 3 is inserted into a gap between the connecting hole 9 and the screw rod 2, the new yaw hydraulic brake 4 is moved upwards, the lower end of the screw rod 2 is exposed out of the lower part of the new yaw hydraulic brake 4, the other person manually rotates the speed reducer 5 on the screw rod 2, the speed reducer 5 is in threaded connection with the screw rod 2, and the person holding the new yaw hydraulic brake 4 slowly releases his hands to press the new yaw hydraulic brake 4 on the speed reducer 5;
6) the electric wrench 7 drives the speed reducer coupler 6 to rotate, so that the speed reducer 5 ascends along the screw rod 2, meanwhile, the protective sleeve 3 also moves upwards along with the new yaw hydraulic brake 4, and when the yaw hydraulic brake 4 moves upwards to the installation position of the yaw hydraulic brake 4, the electric wrench 7 stops working;
7) firstly installing other foundation bolts connected with the yaw hydraulic brake 4, then detaching the speed reducer 5 from the screw rod 2, screwing out the screw rod 1, screwing in the foundation bolts in the screw holes of the screwed-out screw rod 1, screwing down all the foundation bolts, and finishing the replacement of the yaw hydraulic brake 4.
Because the driftage hydraulic brake 4 is eccentric for branch, under the action of gravity, the driftage hydraulic brake 4 removes the in-process, can produce an contained angle between the axis of connecting hole 9 and the axis of lead screw 2 for the inner wall of connecting hole 9 contacts with lead screw 2 and damages lead screw 2, so, suit protective case 3 on protective lead screw 2, and make protective case 3 get into in the connecting hole 9, be used for protecting lead screw 2, prevent to driftage hydraulic brake 4 and remove in-process damage lead screw 2.
In the method, the lead screw 2 is used as a support, the bolt 1 is used as a connecting piece, and the speed reducer 5 is used for lifting the yaw hydraulic brake 4 to replace manpower, so that potential safety hazards caused by human fatigue are avoided; and the time for processing the oil leakage fault of the yaw hydraulic brake of the wind turbine generator can be effectively shortened, and the equipment availability is improved.
Claims (4)
1. A method for replacing a yaw hydraulic brake of a wind turbine generator is characterized by comprising the following steps:
1) taking a replacing tool, wherein the replacing tool comprises a speed reducer (5), a speed reducer coupler (6), an electric wrench (7), a sleeve head (8) and a support rod formed by fixedly connecting a screw rod (1) and a screw rod (2);
2) dismantling one foundation bolt connected with a yaw hydraulic brake (4) on the yaw system, then penetrating a screw (1) into a connecting hole (9) on the yaw hydraulic brake (4) after the foundation bolt is dismantled, and screwing the screw into a screw hole after the foundation bolt is dismantled;
3) aligning a screw hole on the speed reducer (5) with the screw rod (2), and manually rotating the speed reducer (5) to enable the speed reducer (5) to be in threaded connection with the screw rod (2); the speed reducer coupler (6) is driven to rotate through the electric wrench (7), so that the speed reducer (5) rises to the lower end of the yaw hydraulic brake (4) along the screw rod (2) and is in contact with the yaw hydraulic brake (4);
4) dismantling the rest foundation bolts connected with the yaw hydraulic brake (4), and supporting the yaw hydraulic brake (4) by the speed reducer (5); the electric wrench (7) drives the speed reducer coupler (6) to rotate reversely, so that the speed reducer (5) moves downwards along the screw rod (2), the yaw hydraulic brake (4) moves downwards along with the speed reducer (5) under the action of self gravity in the downward moving process of the speed reducer (5), the speed reducer (5) moves downwards to the lower end of the screw rod (2) to support the yaw hydraulic brake (4), the electric wrench (7) continues to work, and the speed reducer (5) continues to move downwards and is separated from the screw rod (2);
5) the new yaw hydraulic brake (4) is supported, a connecting hole (9) in the new yaw hydraulic brake (4) is sleeved on the screw rod (2), the new yaw hydraulic brake (4) is moved upwards, the end of the screw rod (2) is exposed, and the speed reducer (5) is in threaded connection with the screw rod (2);
6) the speed reducer coupler (6) is driven to rotate through the electric wrench (7), so that the speed reducer (5) rises along the screw rod (2), and when the yaw hydraulic brake (4) moves up to the installation position of the yaw hydraulic brake (4), the electric wrench (7) stops working;
7) firstly installing other foundation bolts connected with a new yaw hydraulic brake (4), then detaching the speed reducer (5) from the screw rod (2), then screwing out the screw rod (1), screwing in the foundation bolts in the screw holes of the screwed-out screw rod (1), screwing down all the foundation bolts, and finishing the replacement of the yaw hydraulic brake (4).
2. The method for replacing the yaw hydraulic brake of the wind turbine generator set according to claim 1, wherein in the step 1), the outer diameter of the screw rod (1) is larger than the outer diameter of the screw rod (2).
3. The method for replacing the yaw hydraulic brake of the wind turbine generator set according to claim 1, wherein in the step 3), the protective sleeve (3) is taken firstly, the protective sleeve (3) is sleeved on the screw rod (2), the protective sleeve (3) penetrates into the connecting hole (9), and then the screw hole on the speed reducer (5) is aligned to the screw rod (2).
4. The method for replacing the yaw hydraulic brake of the wind turbine generator system according to claim 1, wherein in the step 5), after one connecting hole (9) in a new yaw hydraulic brake (4) is sleeved on the screw rod (2), the protective sleeve (3) is inserted into a gap between the connecting hole (9) and the screw rod (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010104289.7A CN111255632B (en) | 2020-02-20 | 2020-02-20 | Method for replacing yaw hydraulic brake of wind turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010104289.7A CN111255632B (en) | 2020-02-20 | 2020-02-20 | Method for replacing yaw hydraulic brake of wind turbine generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111255632A CN111255632A (en) | 2020-06-09 |
| CN111255632B true CN111255632B (en) | 2022-04-12 |
Family
ID=70949638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010104289.7A Active CN111255632B (en) | 2020-02-20 | 2020-02-20 | Method for replacing yaw hydraulic brake of wind turbine generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111255632B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672464A (en) * | 2012-05-28 | 2012-09-19 | 南车株洲电力机车研究所有限公司 | Installation method and auxiliary installation device for yaw brake of megawatt-level wind generating set |
| CN204524711U (en) * | 2015-03-31 | 2015-08-05 | 南车株洲电力机车研究所有限公司 | A kind of wind generating set yaw brake examine and replace device |
| CN204546407U (en) * | 2014-12-12 | 2015-08-12 | 中船重工(重庆)海装风电设备有限公司 | Wind turbines off-course brake dismantling device |
| CN207256145U (en) * | 2017-07-13 | 2018-04-20 | 明阳智慧能源集团股份公司 | Off-course brake replaces frock on a kind of tower of MW class wind turbine group |
| CN208024512U (en) * | 2018-02-27 | 2018-10-30 | 大连东鼎工业设备有限公司 | A kind of wind power yawing brake installing and dismounting device |
-
2020
- 2020-02-20 CN CN202010104289.7A patent/CN111255632B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672464A (en) * | 2012-05-28 | 2012-09-19 | 南车株洲电力机车研究所有限公司 | Installation method and auxiliary installation device for yaw brake of megawatt-level wind generating set |
| CN204546407U (en) * | 2014-12-12 | 2015-08-12 | 中船重工(重庆)海装风电设备有限公司 | Wind turbines off-course brake dismantling device |
| CN204524711U (en) * | 2015-03-31 | 2015-08-05 | 南车株洲电力机车研究所有限公司 | A kind of wind generating set yaw brake examine and replace device |
| CN207256145U (en) * | 2017-07-13 | 2018-04-20 | 明阳智慧能源集团股份公司 | Off-course brake replaces frock on a kind of tower of MW class wind turbine group |
| CN208024512U (en) * | 2018-02-27 | 2018-10-30 | 大连东鼎工业设备有限公司 | A kind of wind power yawing brake installing and dismounting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111255632A (en) | 2020-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111255632B (en) | Method for replacing yaw hydraulic brake of wind turbine generator | |
| CN204661198U (en) | The inner jacking system of a kind of wind turbine tower | |
| CN216564273U (en) | Bird repeller electrified automatic dismounting device | |
| CN105858554A (en) | Self-lifting platform used for maintaining wind power tower tube outer wall | |
| CN204984746U (en) | Maintain platform from lift -type pylon | |
| CN211220485U (en) | Auxiliary device for replacing brake pad of yaw brake caliper | |
| CN211029853U (en) | Device for dismounting and mounting water turbine runner coupling bolt | |
| CN215830174U (en) | Electric drive protective guard device for pumped storage power station | |
| CN107370006B (en) | Platform is dismantled in special use of million volt sleeve pipe terminal | |
| CN210509475U (en) | Anti-toppling wind driven generator | |
| CN211521327U (en) | Large-scale thermal power factory overhauls generator axle bush tile turning tool | |
| CN203887480U (en) | Mounting device for runner blade of axial-flow kaplan turbine | |
| CN208330622U (en) | A kind of small hanging basket of wind-powered electricity generation industry application | |
| CN220283265U (en) | Hoisting guiding device for top cover of hydroelectric generating set | |
| CN220915110U (en) | Device is extracted to hydro-generator rotor magnetic pole key | |
| CN203734468U (en) | Falling protection device in generator rotor hoisting | |
| CN217046270U (en) | Bulb tubular turbine stator outer bearing assembly and disassembly tools | |
| CN216613800U (en) | Combined generator and turbine starter hoisting equipment | |
| CN105406660B (en) | Draw-out and assembling machine structure in the cabin of tower windward machine rotor | |
| CN218488263U (en) | Tool for disassembling guide vane sleeve in water turbine | |
| CN217966799U (en) | Tool for replacing damping spline of oil pump motor coupler of gear box | |
| CN215719238U (en) | Wind power tower cylinder convenient to overhaul | |
| CN214330810U (en) | Replacing device for sliding friction plate of wind generating set | |
| CN212553673U (en) | Special tool for disassembling square head of servomotor | |
| CN219705009U (en) | Lower frame lifting tool nut mounting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |