CN221051435U - Main winch device driven by permanent magnet synchronous motor and provided with energy recovery system - Google Patents
Main winch device driven by permanent magnet synchronous motor and provided with energy recovery system Download PDFInfo
- Publication number
- CN221051435U CN221051435U CN202322954695.4U CN202322954695U CN221051435U CN 221051435 U CN221051435 U CN 221051435U CN 202322954695 U CN202322954695 U CN 202322954695U CN 221051435 U CN221051435 U CN 221051435U
- Authority
- CN
- China
- Prior art keywords
- energy recovery
- energy
- transmission connection
- assembly
- planetary
- 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
- 238000011084 recovery Methods 0.000 title claims abstract description 114
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims description 46
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 238000004146 energy storage Methods 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000010354 integration Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The utility model provides a main winch device driven by a permanent magnet synchronous motor provided with an energy recovery system, which solves the problems of poor kinetic energy recovery effect and the like of a winch. The utility model has the advantages of good kinetic energy recovery effect, stable structure and the like.
Description
Technical Field
The utility model belongs to the technical field of windlass, and particularly relates to a main windlass driven by a permanent magnet synchronous motor with an energy recovery system.
Background
With the deepening of environmental protection, technical progress and energy safety importance of countries around the world, the electric innovation of engineering machinery with large energy consumption and high pollution discharge is a necessary trend. At present, the rotary drilling rigs in the market are all the prior mature technologies, cannot meet the national green environment-friendly requirements, and the electric requirements of all the parts are continuously increased. The main winch of the traditional rotary drilling rig is mostly provided with power by an imported hydraulic motor, and has the problems of high price, long supply period, difficult after-sales and the like. The motor drive meets the national low-carbon environment-friendly requirement, and solves the problems of the imported hydraulic motor in the aspects of cost, supply period, after-sales service and the like. The traditional hydraulic motor also has the problems of low transmission efficiency and low energy utilization rate.
In order to solve the defects existing in the prior art, long-term exploration is performed, and various solutions are proposed. For example, chinese patent literature discloses a hoisting mechanism power recovery system and power recovery method [202210269269.4] for an engineering machine, which includes a closed circuit, an engine, and a motor energy storage system; the closed loop comprises a winch motor and a closed pump, the winch motor is connected with the winch mechanism, a first oil port of the closed pump is connected with a first oil port of the winch motor through a first pipeline, and a second oil port of the closed pump is connected with a second oil port of the winch motor through a second pipeline; the engine is connected with the closed pump; the motor energy storage system comprises a motor, a motor controller and an energy storage unit, wherein the motor is connected with the closed pump, the motor controller is connected with the motor, and the energy storage unit is connected with the motor controller; when the hoisting mechanism is lowered, hydraulic oil can be driven to flow into the closed pump from the hoisting motor, so that the closed pump reversely drags the engine, and the closed pump drives the motor to rotate for energy storage.
The problem of low energy utilization rate of the winch is solved to a certain extent by the scheme, but the scheme still has a plurality of defects, such as poor kinetic energy recovery effect and the like.
Disclosure of Invention
The utility model aims to solve the problems and provide the main winch device driven by the permanent magnet synchronous motor with the energy recovery system, which is reasonable in design and good in kinetic energy recovery effect.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a be equipped with energy recuperation system's synchronous motor drive's of permanent magnetism main winch device, including synchronous driving motor of permanent magnetism, synchronous driving motor of permanent magnetism passes through transitional flange dish and spline shaft transmission connection, the spline shaft passes through planetary reducer and main winch transmission connection, install first energy recuperation subassembly between spline shaft and the planetary reducer, install second energy recuperation subassembly between planetary reducer and the main winch, main winch is equipped with third energy recuperation subassembly, first energy recuperation subassembly, second energy recuperation subassembly and third energy recuperation subassembly pass through the integrated component and are connected with the generator, the generator is connected with the electricity storage subassembly.
In the above-described main hoisting device driven by a permanent magnet synchronous motor equipped with an energy recovery system, the first energy recovery assembly includes a first recovery gear set in driving connection with the spline shaft, the first recovery gear set is equipped with a first electromagnetic clutch, and the first recovery gear set is in driving connection with the integrated assembly.
In the above-mentioned main hoisting device driven by a permanent magnet synchronous motor equipped with an energy recovery system, the second energy recovery assembly includes a second recovery gear set in driving connection with a sun gear of the planetary reducer, the second recovery gear set is equipped with a second electromagnetic clutch, and the second recovery gear set is in driving connection with the integrated assembly.
In the above-mentioned main winch device driven by a permanent magnet synchronous motor equipped with an energy recovery system, the third energy recovery assembly includes an energy storage flywheel in driving connection with the main winch, and the energy storage flywheel is in driving connection with the main winch or the integrated assembly through a third electromagnetic clutch.
In the above-mentioned main winch device driven by the permanent magnet synchronous motor equipped with the energy recovery system, the energy storage flywheel is encapsulated in the vacuum box and is in transmission connection with the lubrication bearing between them.
In the above-mentioned main winch device driven by a permanent magnet synchronous motor equipped with an energy recovery system, the integrated assembly includes a first planetary set and a second planetary set which are in transmission connection with each other, the first planetary set is in transmission connection with the third energy recovery assembly, and the second planetary set is in transmission connection with the first energy recovery assembly and the second energy recovery assembly.
In the above-mentioned main winch device driven by a permanent magnet synchronous motor equipped with an energy recovery system, the first planetary gear set includes a first outer toothed ring, the outer teeth of the first outer toothed ring are in transmission connection with the third energy recovery assembly, the inner teeth of the first outer toothed ring are in transmission connection with the first planetary gears, a first planet carrier is connected between the first planetary gears, and the first planetary gears are in transmission connection with the first sun gear.
In the above-mentioned main winch device driven by a permanent magnet synchronous motor equipped with an energy recovery system, the second planetary gear set includes a second external gear ring, external teeth of the second external gear ring are in transmission connection with the first energy recovery component, internal teeth of the second external gear ring are in transmission connection with the second planetary gear, a second planet carrier is connected between the second planetary gears, the second planet carrier is in transmission connection with the second energy recovery component, and the second planetary gear is in transmission connection with the second sun gear.
In the above-mentioned main winch device driven by the permanent magnet synchronous motor equipped with the energy recovery system, the first sun gear is fixedly connected with the integrated shaft, and the second sun gear is in transmission connection with the first planet carrier through the transmission belt.
In the above-described main hoisting device driven by a permanent magnet synchronous motor equipped with an energy recovery system, the electricity storage assembly includes a controller connected to the generator, and the controller is connected to the power battery.
Compared with the prior art, the utility model has the advantages that: the plurality of energy recovery components are matched for recovering kinetic energy and are concentrated, conducted and converted by the integrated components, so that the energy recovery device has higher energy recovery rate for the main winch driven by the motor; the integrated component realizes power integration and unified output, and ensures that all energy recovery components are not interfered with each other; and the energy storage assembly is used for storing and re-inputting the energy into the permanent magnet synchronous motor, so that the electric energy waste is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of another view of the present utility model;
FIG. 3 is a schematic diagram of an energy recovery system of the present utility model;
FIG. 4 is a schematic structural view of the integrated assembly of the present utility model;
In the figure, a permanent magnet synchronous drive motor 1, a transition flange 11, a spline shaft 12, a planetary reducer 13, a main winch 14, a first energy recovery assembly 2, a first recovery gear set 21, a first electromagnetic clutch 22, a second energy recovery assembly 3, a second recovery gear set 31, a second electromagnetic clutch 32, a third energy recovery assembly 4, an energy storage flywheel 41, a third electromagnetic clutch 42, a vacuum box 43, an integrated assembly 5, a first outer gear ring 51, a first planet gear 52, a first planet carrier 53, a first sun gear 54, a second outer gear ring 55, a second planet gear 56, a second planet carrier 57, a second sun gear 58, an integrated shaft 59, a generator 6, an electricity storage assembly 7, a controller 71 and a power battery 72.
Detailed Description
The utility model will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1-3, a permanent magnet synchronous motor-driven main hoisting device with an energy recovery system is used for replacing the traditional hydraulic motor power source, and the permanent magnet synchronous driving motor 1 is used for providing driving force, so that on one hand, larger torque can be provided when a drill rod is lifted, and on the other hand, construction noise is reduced. The permanent magnet synchronous driving motor 1 is in transmission connection with a spline shaft 12 through a transition flange 11, the spline shaft 12 is in transmission connection with a main winch 14 through a planetary reducer 13, a first energy recovery assembly 2 is installed between the spline shaft 12 and the planetary reducer 13, a second energy recovery assembly 3 is installed between the planetary reducer 13 and the main winch 14, the main winch 14 is provided with a third energy recovery assembly 4, and when a drill rod descends, the spline shaft 12, the planetary reducer 13 and the main winch 14 are respectively recovered by the energy recovery assemblies. The first energy recovery component 2, the second energy recovery component 3 and the third energy recovery component 4 are connected with the generator 6 through the integrated component 5, kinetic energy is intensively led out by the integrated component 5, and the recovery components of different torques are not interfered with each other. The generator 6 is connected with the electricity storage component 7, and the electricity storage component 7 temporarily stores electric energy, and a battery or a capacitor can be selected to provide driving force for the permanent magnet synchronous driving motor 1.
Specifically, the permanent magnet synchronous drive motor 1 outputs torque to the spline shaft 12 in a normal state, stops outputting when the drill rod descends and recovers the spline shaft 12 torque by the first energy recovery assembly 2. The first energy recovery assembly 2 comprises a first recovery gear set 21 in a gear-transmitting connection with the spline shaft 12 for variable speed transmission, the first recovery gear set 21 being provided with a first electromagnetic clutch 22 controlling the meshing transmission of the first recovery gear set 21. The first recovery gear set 21 is in transmission connection with the integrated component 5, meanwhile, the first energy recovery component 2 can be started to play a damping and buffering role when the permanent magnet synchronous driving motor 1 outputs, and the first energy recovery component is matched with the planetary reducer 13 to realize stable lifting of the drill rod.
Further, the second energy recovery assembly 3 is in direct driving connection with the planetary reducer 13, and specifically comprises a second recovery gear set 31 in driving connection with the sun gear of the planetary reducer 13, and part of the torque of the planetary reducer 13 is transmitted to the recovery gear set 31. The second recovery gear set 31 is provided with a second electromagnetic clutch 32 for controlling the meshing transmission of the second recovery gear set 31 with the gear set inside the planetary reducer 13. The second recovery gear set 31 is in driving connection with the integrated assembly 5.
Further, the third energy recovery assembly 4 comprises an energy storage flywheel 41 in driving connection with the main winch 14 for temporary storage of kinetic energy, and the kinetic energy can be directly transmitted back to the main winch 14 through the third energy recovery assembly 4. The energy storage flywheel 41 is in transmission connection with the main winch 14 or the integrated assembly 5 through a third electromagnetic clutch 42, and the third electromagnetic clutch 42 controls the alternative meshing transmission of the input end and the output end of the energy storage flywheel 41.
Further, similar to the conventional flywheel energy storage structure, the energy storage flywheel 41 of the present application is enclosed in the vacuum box 43 and is in driving connection with a lubrication bearing therebetween, and the vacuum box 43 is always kept sealed.
As shown in fig. 4, in order to achieve concentrated power transfer of the recovery assembly into the integrated assembly 5, existing power recovery typically employs multiple motors, which increases the overall volume of the energy recovery system, resulting in increased cost of the energy recovery system. The integrated assembly 5 comprises a first planetary group and a second planetary group which are in transmission connection with each other, the first planetary group is in transmission connection with the third energy recovery assembly 4, the second planetary group is in transmission connection with the first energy recovery assembly 2 and the second energy recovery assembly 3, and the two-stage planetary groups are combined with each other, so that the power integration input of the three recovery assemblies is realized.
Meanwhile, the first planetary gear set comprises a first outer toothed ring 51 rotatably installed in the planetary gear box, the outer teeth of the first outer toothed ring 51 are in transmission connection with a third energy recovery assembly 4, and the third energy recovery assembly 4 is provided with a transmission gear in meshed transmission with the first outer toothed ring 51. The inner teeth of the first outer ring gear 51 are in driving connection with the first planetary gears 52, and a first carrier 53 is connected between the first planetary gears 52, wherein the first carrier 53 in the present application is in a ring shape, and the first planetary gears 52 revolve while rotating. The first planet gears 52 are in driving connection with the first sun gear 54, and the first sun gear 54 rotates and outputs power.
The second planetary set is arranged adjacent to the first planetary set and comprises a second external toothed ring 55, the external teeth of the second external toothed ring 55 being in driving connection with the first energy recovery assembly 2, and the internal teeth of the second external toothed ring 55 being in driving connection with the second planetary wheels 56. A second planet carrier 57 is connected between the second planet wheels 56, and the second planet carrier 57 drives each second planet wheel 56 to synchronously rotate along with the movement similar to the movement of the first planet wheel 52. The second planet carrier 57 is in drive connection with the second energy recovery assembly 3, and the second planet gears 56 are in drive connection with the second sun gear 58. The first planetary set is of similar gauge to the second planetary set and the first planet 52 and second planet 56 have the same gear ratio.
It is evident that the first sun wheel 54 is fixedly connected to the integrated shaft 59, the torque being concentrated by the integrated shaft 59, the integrated shaft 59 extending outwards relative to the planetary gearbox. The second sun gear 58 is in driving connection with the first planet carrier 53 through a driving belt, the second sun gear 58 performs primary concentration on the kinetic energy recovered by the first energy recovery assembly 2 and the second energy recovery assembly 3, and then the first planet group performs secondary concentration on the kinetic energy.
Preferably, the electricity storage assembly 7 comprises a controller 71 connected with the generator 6, and the controller 71 realizes voltage transformation and AC/DC conversion. The controller 71 is connected to the power battery 72, and the power battery 72 may be replaced with a capacitor.
In summary, the principle of this embodiment is as follows: the permanent magnet synchronous driving motor 1 provides driving torque for the main winch 14, and when a drill rod connected with a steel wire rope on the main winch 14 descends, the energy recovery assembly respectively recovers driving torque of the spline shaft 12, the planetary reducer 13 and the main winch 14, and the driving torque is intensively input into the generator 6 by the integration assembly 5 and is recovered and stored by the electricity storage assembly 7.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.
Although terms of the permanent magnet synchronous drive motor 1, the transition flange 11, the spline shaft 12, the planetary reducer 13, the main winding 14, the first energy recovery assembly 2, the first recovery gear set 21, the first electromagnetic clutch 22, the second energy recovery assembly 3, the second recovery gear set 31, the second electromagnetic clutch 32, the third energy recovery assembly 4, the energy storage flywheel 41, the third electromagnetic clutch 42, the vacuum box 43, the integration assembly 5, the first outer ring gear 51, the first planet gears 52, the first carrier 53, the first sun gear 54, the second outer ring gear 55, the second planet gears 56, the second carrier 57, the second sun gear 58, the integration shaft 59, the generator 6, the electricity storage assembly 7, the controller 71, the power battery 72, etc. are used more herein, other terms are not excluded. These terms are used merely for convenience in describing and explaining the nature of the utility model; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present utility model.
Claims (10)
1. The utility model provides a be equipped with energy recuperation system's main winch device of PMSM drive, includes PMSM (1), PMSM (1) pass through transition ring flange (11) and spline shaft (12) transmission connection, spline shaft (12) pass through planetary reducer (13) and main winch (14) transmission connection, its characterized in that, spline shaft (12) and planetary reducer (13) between install first energy recuperation subassembly (2), planetary reducer (13) and main winch (14) between install second energy recuperation subassembly (3), main winch (14) be equipped with third energy recuperation subassembly (4), first energy recuperation subassembly (2), second energy recuperation subassembly (3) and third energy recuperation subassembly (4) be connected with generator (6) through integrated subassembly (5), generator (6) and store up electric subassembly (7) and be connected.
2. The main winch arrangement driven by a permanent magnet synchronous motor equipped with an energy recovery system according to claim 1, characterized in that the first energy recovery assembly (2) comprises a first recovery gear set (21) in driving connection with the spline shaft (12), said first recovery gear set (21) being equipped with a first electromagnetic clutch (22), said first recovery gear set (21) being in driving connection with the integrated assembly (5).
3. A permanent magnet synchronous motor driven main hoisting device provided with an energy recovery system according to claim 2, characterized in that the second energy recovery assembly (3) comprises a second recovery gear set (31) in driving connection with the sun gear of the planetary reducer (13), said second recovery gear set (31) being provided with a second electromagnetic clutch (32), said second recovery gear set (31) being in driving connection with the integrated assembly (5).
4. A permanent magnet synchronous motor driven main hoisting device provided with an energy recovery system according to claim 3, characterized in that the third energy recovery assembly (4) comprises an energy storage flywheel (41) in transmission connection with the main hoisting (14), the energy storage flywheel (41) being in transmission connection with the main hoisting (14) or the integrated assembly (5) via a third electromagnetic clutch (42).
5. The primary winding device driven by a permanent magnet synchronous motor equipped with an energy recovery system according to claim 4, wherein the energy storage flywheel (41) is enclosed in a vacuum box (43) and is in driving connection with a lubrication bearing.
6. A permanent magnet synchronous motor driven main hoisting device provided with an energy recovery system according to claim 1, characterized in that the integrated assembly (5) comprises a first planetary set and a second planetary set in transmission connection with each other, the first planetary set being in transmission connection with the third energy recovery assembly (4), the second planetary set being in transmission connection with the first energy recovery assembly (2) and the second energy recovery assembly (3).
7. The main hoisting device driven by a permanent magnet synchronous motor equipped with an energy recovery system according to claim 6, wherein the first planetary gear set comprises a first outer toothed ring (51), outer teeth of the first outer toothed ring (51) are in transmission connection with a third energy recovery assembly (4), inner teeth of the first outer toothed ring (51) are in transmission connection with first planetary gears (52), a first planet carrier (53) is connected between the first planetary gears (52), and the first planetary gears (52) are in transmission connection with a first sun gear (54).
8. The main winch device driven by the permanent magnet synchronous motor provided with the energy recovery system according to claim 7, wherein the second planetary gear set comprises a second outer toothed ring (55), outer teeth of the second outer toothed ring (55) are in transmission connection with the first energy recovery assembly (2), inner teeth of the second outer toothed ring (55) are in transmission connection with second planetary gears (56), a second planet carrier (57) is connected between the second planetary gears (56), the second planet carrier (57) is in transmission connection with the second energy recovery assembly (3), and the second planetary gears (56) are in transmission connection with a second sun gear (58).
9. The main winding device driven by a permanent magnet synchronous motor equipped with an energy recovery system according to claim 8, wherein the first sun gear (54) is fixedly connected with the integrated shaft (59), and the second sun gear (58) is in transmission connection with the first planet carrier (53) through a transmission belt.
10. A permanent magnet synchronous motor driven main hoisting device provided with an energy recovery system according to claim 1, characterized in that the electricity storage assembly (7) comprises a controller (71) connected to the generator (6), said controller (71) being connected to the power battery (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322954695.4U CN221051435U (en) | 2023-10-31 | 2023-10-31 | Main winch device driven by permanent magnet synchronous motor and provided with energy recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322954695.4U CN221051435U (en) | 2023-10-31 | 2023-10-31 | Main winch device driven by permanent magnet synchronous motor and provided with energy recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221051435U true CN221051435U (en) | 2024-05-31 |
Family
ID=91206055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322954695.4U Active CN221051435U (en) | 2023-10-31 | 2023-10-31 | Main winch device driven by permanent magnet synchronous motor and provided with energy recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221051435U (en) |
-
2023
- 2023-10-31 CN CN202322954695.4U patent/CN221051435U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206938435U (en) | A kind of dynamical system hybrid power, pure electric transmission machanism | |
| CN201071904Y (en) | Differential epicyclic gear box | |
| CN101993012B (en) | Electric and manual integrated planet driving device | |
| CN201038911Y (en) | External rotor planet gear deceleration motor | |
| CN102022484A (en) | Three-stage combined planetary speed reducer and realization method thereof | |
| CN206287820U (en) | A kind of Dual-motors Driving control device | |
| CN205978303U (en) | Sun -tracking gear | |
| CN202609844U (en) | Built-in electric winch | |
| CN221051435U (en) | Main winch device driven by permanent magnet synchronous motor and provided with energy recovery system | |
| CN201934593U (en) | Three-stage composite planetary reducer | |
| CN202099004U (en) | Driving winding drum with planet mechanism | |
| CN201024887Y (en) | Electric drive top drive device with novel structure | |
| CN215409997U (en) | Differential gear box for lifting | |
| CN215835257U (en) | Large-scale half directly drives integral type permanent magnetism synchronous deceleration motor | |
| CN1807888A (en) | Wind and electricity hybrid driving method and apparatus for sucker rod pump | |
| CN110758083A (en) | New energy vehicle power system and control method thereof | |
| CN212649293U (en) | Mining speed reduction permanent magnet motor | |
| CN205371486U (en) | Hybrid vehicle is with single planetary mechanism derailleur | |
| CN201947112U (en) | Bipolar planetary speed reduction motor | |
| CN212832458U (en) | Redundant drive arrangement of hoist | |
| CN212106807U (en) | Speed reducer for vertical transmission pump | |
| CN210770066U (en) | Energy-saving double-speed automatic transmission | |
| CN220488203U (en) | Bridge rotation speed reducer | |
| CN203309054U (en) | Stepless speed regulating planetary speed reducer for straightening machine | |
| CN201817174U (en) | Traction machine of goods elevator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |