CN107246168B - Mechanical variable-speed rotary lifting device - Google Patents
Mechanical variable-speed rotary lifting device Download PDFInfo
- Publication number
- CN107246168B CN107246168B CN201710613120.2A CN201710613120A CN107246168B CN 107246168 B CN107246168 B CN 107246168B CN 201710613120 A CN201710613120 A CN 201710613120A CN 107246168 B CN107246168 B CN 107246168B
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- Prior art keywords
- gear
- lifting
- power
- transmission
- lifting platform
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H6/00—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages
- E04H6/08—Garages for many vehicles
- E04H6/12—Garages for many vehicles with mechanical means for shifting or lifting vehicles
- E04H6/18—Garages for many vehicles with mechanical means for shifting or lifting vehicles with means for transport in vertical direction only or independently in vertical and horizontal directions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H6/00—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages
- E04H6/42—Devices or arrangements peculiar to garages, not covered elsewhere, e.g. securing devices, safety devices, monitoring and operating schemes; centering devices
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H6/00—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages
- E04H6/42—Devices or arrangements peculiar to garages, not covered elsewhere, e.g. securing devices, safety devices, monitoring and operating schemes; centering devices
- E04H6/426—Parking guides
Abstract
The invention belongs to the technical field of mechanical parking equipment, and particularly relates to a mechanical variable-speed rotary lifting device used in a stereo garage. The mechanical variable-speed rotary lifting device comprises a base, a lifting device and a rotary device; the lifting device comprises a lifting platform, a first power mechanism, a first transmission mechanism and a lifting mechanism; the first power mechanism provides lifting power for the lifting platform, the first transmission mechanism transmits the power provided by the first power mechanism to the lifting mechanism, and the lifting mechanism drives the lifting platform to move up and down relative to the base; the rotating device comprises a second power mechanism, a second transmission mechanism and a rotating mechanism; the second power mechanism drives the swing mechanism to rotate through the second transmission mechanism. The transmission mechanism, the lifting mechanism and the swing mechanism of the invention adopt a purely mechanical gear-gear meshing or a gear-rack meshing, so that the invention has the advantages of small failure rate, high reliability, high transmission precision and large lifting weight.
Description
Technical Field
The invention belongs to the technical field of mechanical parking equipment, and particularly relates to a mechanical variable-speed rotary lifting device used in a stereo garage.
Background
The automobile parking device comprises a stereo garage, a parking platform, a lifting device, a parking plate, a turning device and a parking platform.
The rotary lifting device of the car carrying plate is an important component in a mechanical stereo garage, and the existing lifting device generally adopts the following modes: 1) The screw rod lifter and the steering gear are adopted, and the defects that the transmission efficiency is low, the transmission distance is short, and the lifting range and the speed are limited are overcome; 2) The hydraulic cylinder and the ball screw are adopted for lifting, and the defect is that other auxiliary devices are required to be added, so that the manufacturing cost of the equipment is greatly increased.
The problems of the existing slewing mechanism are as follows: when the device does the rotation action, the rotation speed is constant, a power element is required to provide a large torque when the device is started and stopped, the action and the operation of the device are not stable, and connecting fasteners or structural parts can be damaged if the inertia is too large. Some manufacturers adopt frequency conversion equipment to control the rotary motion, so that not only are other auxiliary facilities such as a frequency conversion controller and the like needed to be added, the equipment cost is increased, but also the required equipment elements are increased, and the failure rate is increased.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a mechanical variable-speed rotary lifting device which adopts the most basic gear-rack transmission or gear-gear transmission and has the advantages of large lifting weight, simple processing and manufacturing and low cost.
The technical scheme for solving the problems is as follows: a mechanical variable-speed rotary lifting device is characterized in that:
comprises a base, a lifting device and a rotating device;
the lifting device comprises a lifting platform, a first power mechanism, a first transmission mechanism and a lifting mechanism;
the lifting platform is positioned above the base, and the first power mechanism, the first transmission mechanism and the lifting mechanism are arranged on the lifting platform;
the first power mechanism provides lifting power for the lifting platform, the first transmission mechanism transmits the power provided by the first power mechanism to the lifting mechanism, and the lifting mechanism drives the lifting platform to move up and down relative to the base;
the lifting mechanism comprises a plurality of lifting gears and a plurality of rack columns, and the rack columns are vertically arranged on the base; the number of the lifting gears is the same as that of the rack columns, and the lifting gears are arranged on the lifting platform and are respectively meshed with the corresponding rack columns;
the rotating device comprises a second power mechanism, a second transmission mechanism and a rotating mechanism;
the second power mechanism, the second transmission mechanism and the swing mechanism are all arranged on the lifting platform, the second power mechanism drives the swing mechanism to rotate through the second transmission mechanism, and the swing mechanism bears an object to be rotated;
the second transmission mechanism comprises a first gear;
the slewing mechanism comprises a second gear and an octagonal turntable; the first gear is meshed with the second gear, a plurality of U-shaped grooves are uniformly formed in the octagonal rotary table, a plurality of idler wheels are uniformly arranged on the upper end face of the second gear, and the idler wheels are matched with the U-shaped grooves;
the second power mechanism drives the first gear to rotate, the first gear is meshed with the second gear, and the second gear is matched with the U-shaped groove through a roller on the upper end face of the second gear to drive the octagonal rotary table to rotate in a variable speed mode.
The above is the basic structure of the present invention, and based on the basic structure, the present invention also makes the following optimization improvements:
further, the first transmission mechanism comprises a driving gear, a plurality of intermediate gears, a driven gear and a first transmission shaft; the driven gear is arranged in the middle of the first transmission shaft, and the lifting gears are arranged at two ends of the first transmission shaft; the first power mechanism drives the driving gear, the driving gear is meshed with the intermediate gear, the intermediate gear is meshed with the driven gear, and the driven gear drives the lifting gear to rotate through the first transmission shaft.
Furthermore, a guide device is further arranged on the lifting platform and comprises a fixing shaft, the fixing shaft is fixed on the lifting platform, a guide roller is further arranged on the fixing shaft, and the outer surface of the guide roller is in contact with the surface opposite to the tooth surface of the rack column.
Furthermore, the second transmission mechanism further comprises a second transmission shaft, a first bevel gear and a second bevel gear, the first gear and the second bevel gear are respectively and fixedly arranged at two ends of the second transmission shaft, the second power mechanism drives the first bevel gear, the first bevel gear is meshed with the second bevel gear, and the second bevel gear drives the first gear to rotate through the second transmission shaft.
Furthermore, the number of the U-shaped grooves is the same as that of the rollers.
Furthermore, the octagonal rotary table is fixedly provided with fixing seats, the number of the fixing seats is the same as that of the U-shaped grooves, each fixing seat stretches across one U-shaped groove, and an object to be rotated can be fixedly arranged on the fixing seat.
Furthermore, the base is also provided with an upright post, the upright post is provided with two limit switches, and the lifting platform is provided with a switch collision block matched with the limit switches.
Furthermore, the number of the rack columns is four, and the rack columns are distributed on the base in a rectangular shape.
Further, the first power mechanism and the second power mechanism are both speed reduction motors.
Furthermore, the outer surface of the guide roller is provided with a rubber layer.
The invention has the advantages that:
1. the transmission mechanism, the lifting mechanism and the swing mechanism of the invention adopt a purely mechanical gear-gear meshing or a gear-rack meshing, so that the invention has the advantages of small failure rate, high reliability, high transmission precision and large lifting weight.
2. The power source of the invention adopts the most common speed reducing motor, and the transmission mechanism, the lifting mechanism and the slewing mechanism are composed of pure mechanical parts, thus the manufacturing cost is low.
3. The lifting mechanism adopts a speed reducing motor to drive four lifting gears to simultaneously move up and down on the rack column at the same speed through the transmission mechanism, so that the action is more stable.
4. The slewing mechanism of the invention can change speed and prevent the damage of parts caused by overlarge inertia when the equipment is started and stopped.
5. The transmission mechanism of the invention adopts the bevel gear, so that the speed reducing motor can be transversely arranged, and the longitudinal space is saved.
6. The fixed shaft of the guide device is provided with the roller, so that the friction force generated when the lifting platform moves up and down can be reduced; still be equipped with the rubber layer on the gyro wheel, can effectively reduce the noise.
7. The lifting gears are arranged at the two ends of the transmission shaft, the driven gears are arranged in the middle of the transmission shaft, and the lifting gears at the two ends of the transmission shaft are driven by the driven gears, so that the lifting gear has the advantage of long transmission distance.
Drawings
FIG. 1 is an isometric view of a three-dimensional structure of the present invention;
FIG. 2 is a bottom view of the present invention;
FIG. 3 is an isometric view of the lift mechanism of the present invention;
FIG. 4 is an enlarged view at A in FIG. 3;
FIG. 5 is a schematic view of the gear set drive direction of the first drive mechanism of the present invention;
FIG. 6 is an assembly view of the driven gear, lifting gear and drive shaft of the present invention;
FIG. 7 is an isometric view of the swing mechanism of the present invention;
fig. 8 is a front view of the slewing mechanism of the present invention.
Wherein: 1-a base; 101-limit switch; 102-a switch bump; 103-upright post; 2-a lifting device; 201-lifting platform; 202-a lifting gear; 203-rack column; 204-a drive gear; 205-intermediate gear; 206-driven gear; 207-a first transmission shaft; 208-a fixed shaft; 209-guide roller; 3-a turning device; 302-a first gear; 303-a second gear; 304-an octagonal turntable; 305-U-shaped groove; 306-a roller; 307-a second drive shaft; 308-a first bevel gear; 309-a second bevel gear; 310-a fixed seat; 4-a first gear motor; 5-a second gear motor.
Detailed Description
The invention is described in detail below with reference to the following examples, which are given in the accompanying drawings:
for convenience only, in the following description, specific directional terms, such as "upper", "lower", "left", "right", and the like, are used with reference to the corresponding drawings and are not to be construed as limiting the invention, and when the directions of definitions in the drawings are changed, the directions indicated by these words should be construed as corresponding different directions.
Referring to fig. 1 and 2, a mechanical variable-speed rotary lifting device comprises a base 1, a lifting device 2 and a rotary device 3.
Referring to fig. 1, 2, 3 and 4, the lifting device 2 includes a lifting platform 201, a first power mechanism, a first transmission mechanism and a lifting mechanism.
The lifting platform 201 is located on the base 1, and the first power mechanism, the first transmission mechanism and the lifting mechanism are arranged on the lifting platform 201. The first power mechanism provides lifting power for the lifting platform 201, the first transmission mechanism transmits the power provided by the first power mechanism to the lifting mechanism, and the lifting mechanism drives the lifting platform 201 to move up and down relative to the base 1.
The first power mechanism is a first speed reducing motor 4, the first speed reducing motor 4 is a common speed reducing motor, and the first power mechanism can also adopt other power sources with constant speed output.
The first transmission mechanism comprises a driving gear 204, a plurality of intermediate gears 205, a driven gear 206 and a first transmission shaft 207; referring to fig. 5 and 6, the driven gear 206 is disposed at the middle of the first transmission shaft 207, and the lifting gears 202 are installed at both ends of the first transmission shaft 207; the first power mechanism drives the driving gear 204, the driving gear 204 is meshed with the intermediate gear 205, the intermediate gear 205 is meshed with the driven gear 206, and the driven gear 206 drives the lifting gear 202 to rotate through the first transmission shaft 207; in order to raise or lower the lifting device as a whole, the number of the intermediate gears on both sides of the driving gear 204 is different, and the right side is provided with one more intermediate gear than the left side, so that the rotation directions of the driven gears on both sides are opposite.
The lifting mechanism comprises a lifting gear 202 and a plurality of rack columns 203, the number of the rack columns 203 is preferably four, and four rack columns 203 are vertically arranged at four corners 1 of the base in a rectangular shape; the number of the lifting gears 202 is the same as that of the rack columns 203, and the lifting gears 202 are arranged on the lifting platform 201 and are respectively meshed with the corresponding rack columns 203.
The lifting platform 201 is further provided with a guide device, the guide device comprises a fixing shaft 208, the fixing shaft 208 is fixed on the lifting platform 201, the fixing shaft is further provided with a guide roller 209, and the outer surface of the guide roller 209 is in surface contact with the back of the tooth surface of the rack column 203. The outer surface of the guide roller 209 is provided with a rubber layer.
Referring to fig. 1, 2, 7 and 8, the swing device 3 includes a second power mechanism, a second transmission mechanism and a swing mechanism.
The second power mechanism, the second transmission mechanism and the swing mechanism are all arranged on the lifting platform 201, and the second power mechanism drives the swing mechanism to rotate through the second transmission mechanism.
The second power mechanism is a second speed reducing motor 5, the second speed reducing motor 5 is a common speed reducing motor, and other power sources with constant speed output can also be adopted by the second power mechanism.
The second transmission mechanism comprises a first gear 302, a second transmission shaft 307, a first bevel gear 308 and a second bevel gear 309, the first gear 302 and the second bevel gear 309 are respectively and fixedly arranged at two ends of the second transmission shaft 307, the second power mechanism drives the first bevel gear 308, the first bevel gear 308 is meshed with the second bevel gear 309, and the second bevel gear 309 drives the first gear 302 to rotate through the second transmission shaft 307.
The swing mechanism comprises a second gear 303 and an octagonal turntable 304; the first gear 302 is meshed with the second gear 303, four U-shaped grooves 305 are uniformly formed in the octagonal turntable 304, four rollers 306 are uniformly arranged on the upper end face of the second gear 303, the rollers 306 are matched with the U-shaped grooves 305, the number of the U-shaped grooves 305 is different from that of the rollers 306, the slewing device does intermittent variable-speed motion, and the number of the U-shaped grooves 305 is the same as that of the rollers 306, and the slewing device does continuous variable-speed motion. The octagonal rotary table 304 is fixedly provided with four fixed seats 310, each fixed seat 310 spans one U-shaped groove 305, and the object to be rotated can be fixedly arranged on the four fixed seats 310.
The second power mechanism drives the first gear 302 to rotate, the first gear 302 is meshed with the second gear 303, and the second gear 303 drives the octagonal rotary table 304 to rotate in a variable speed mode through the matching of the roller 306 on the upper end face of the second gear 303 and the U-shaped groove 305.
Referring to fig. 1 and 4, the base 1 is further provided with a column 103, the column 103 is provided with two limit switches 101, and the lifting platform 201 is provided with a switch collision block 102 matched with the limit switches 101.
The working principle of the invention is as follows:
the first speed reduction motor 4 rotates to drive the driving gear 204 to rotate, the driving gear 204 is meshed with the intermediate gear 205, the intermediate gear 205 is meshed with the driven gear 206, the driven gear 206 drives the four lifting gears 202 to rotate through the first transmission shaft 207, the lifting gears 202 are meshed with the rack columns 203, the lifting gears 202 move up and down along the rack columns 203, the guide rollers 209 on the guide devices are in contact with the back surfaces of the rack columns 203, it is guaranteed that the lifting gears 202 are meshed with the rack columns 203 all the time, and therefore the lifting platform 201 moves up and down relative to the base 1. The rotating device 3 is arranged on the lifting device 2, and the rotating device 3 and the lifting platform 201 move up and down relative to the base 1. The first speed reducing motor 4 rotates forwards and backwards to control the lifting platform 201 to ascend or descend, and the two limit switches 101 limit specific ascending or descending positions of the lifting platform 201.
The second speed reduction motor 5 drives a first bevel gear 308, the first bevel gear 308 is meshed with a second bevel gear 309, the second bevel gear 309 drives the first gear 302 to rotate through a second transmission shaft 307, the first gear 302 is meshed with the second gear 303, the second gear 303 drives an octagonal turntable 304 to rotate in a variable speed mode through a roller 306 on the upper end face of the second gear and a U-shaped groove 305 in a matched mode, and the octagonal turntable 304 drives a vehicle carrying board or other objects to be rotated to rotate.
The invention is not only suitable for the field of mechanical parking equipment, but also can be used in lifting and rotating systems in other fields.
Claims (3)
1. The utility model provides a mechanical type variable-speed gyration elevating gear which characterized in that:
comprises a base (1), a lifting device (2) and a rotating device (3);
the lifting device (2) comprises a lifting platform (201), a first power mechanism, a first transmission mechanism and a lifting mechanism,
the lifting platform (201) is positioned on the base (1), the first power mechanism, the first transmission mechanism and the lifting mechanism are arranged on the lifting platform (201), the base (1) is further provided with an upright post (103), the upright post (103) is provided with two limit switches (101), and the lifting platform (201) is provided with a switch collision block (102) matched with the limit switches (101);
the first power mechanism provides lifting power for the lifting platform (201), the first transmission mechanism transmits the power provided by the first power mechanism to the lifting mechanism, the lifting mechanism drives the lifting platform (201) to move up and down relative to the base (1),
the lifting mechanism comprises lifting gears (202) and rack columns (203), the number of the rack columns (203) is four, and the four rack columns (203) are vertically arranged on the base (1) and are distributed on the base (1) in a rectangular shape; the number of the lifting gears (202) is the same as that of the rack columns (203), and the lifting gears (202) are arranged on the lifting platform (201) and are respectively meshed with the corresponding rack columns (203);
the lifting platform (201) is further provided with a guide device, the guide device comprises a fixed shaft (208), the fixed shaft (208) is fixed on the lifting platform (201), the fixed shaft is further provided with a guide roller (209), the outer surface of the guide roller (209) is in surface contact with the back of the tooth surface of the rack column (203), and the outer surface of the guide roller (209) is provided with a rubber layer;
the rotating device (3) comprises a second power mechanism, a second transmission mechanism and a rotating mechanism,
the second power mechanism, the second transmission mechanism and the swing mechanism are all arranged on the lifting platform (201), the second power mechanism drives the swing mechanism to rotate through the second transmission mechanism, and the first power mechanism and the second power mechanism are respectively a first speed reduction motor (4) and a second speed reduction motor (5);
the second transmission mechanism comprises a first gear (302),
the slewing mechanism comprises a second gear (303) and an octagonal turntable (304); the first gear (302) is meshed with the second gear (303), a plurality of U-shaped grooves (305) are uniformly formed in the octagonal rotary table (304), a plurality of rollers (306) are uniformly arranged on the upper end face of the second gear (303), the rollers (306) are matched with the U-shaped grooves (305), and the number of the U-shaped grooves (305) is the same as that of the rollers (306);
the octagonal rotary table (304) is fixedly provided with fixed seats (310), the number of the fixed seats (310) is the same as that of the U-shaped grooves (305), each fixed seat (310) spans one U-shaped groove (305), and an object to be rotated can be fixedly arranged on the fixed seat (310);
the second power mechanism drives the first gear (302) to rotate, the first gear (302) drives the second gear (303) to rotate, and the second gear (303) is matched with the U-shaped groove (305) through a roller (306) on the upper end surface of the second gear to drive the octagonal rotary table (304) to rotate in a variable speed mode.
2. A mechanical variable speed slewing lifting device according to claim 1, characterized in that: the first transmission mechanism comprises a driving gear (204), a plurality of intermediate gears (205), a driven gear (206) and a first transmission shaft (207); the driven gear (206) is arranged in the middle of the first transmission shaft (207), and the lifting gear (202) is arranged at two ends of the first transmission shaft (207); the first power mechanism drives the driving gear (204), the driving gear (204) is meshed with the intermediate gear (205), the intermediate gear (205) is meshed with the driven gear (206), and the driven gear (206) drives the lifting gear (202) to rotate through the first transmission shaft (207).
3. A mechanical variable speed slewing lifting device according to claim 2, characterized in that: the second transmission mechanism further comprises a second transmission shaft (307), a first bevel gear (308) and a second bevel gear (309), the first gear (302) and the second bevel gear (309) are respectively and fixedly arranged at two ends of the second transmission shaft (307), the second power mechanism drives the first bevel gear (308), the first bevel gear (308) is meshed with the second bevel gear (309), and the second bevel gear (309) drives the first gear (302) to rotate through the second transmission shaft (307).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710613120.2A CN107246168B (en) | 2017-07-25 | 2017-07-25 | Mechanical variable-speed rotary lifting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710613120.2A CN107246168B (en) | 2017-07-25 | 2017-07-25 | Mechanical variable-speed rotary lifting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107246168A CN107246168A (en) | 2017-10-13 |
| CN107246168B true CN107246168B (en) | 2022-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710613120.2A Active CN107246168B (en) | 2017-07-25 | 2017-07-25 | Mechanical variable-speed rotary lifting device |
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| CN (1) | CN107246168B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040011137A (en) * | 2002-07-29 | 2004-02-05 | 오티스 엘리베이터 컴파니 | Palette driving unit in the elevator turntable-type parking apparatus |
| CN102661068A (en) * | 2012-05-29 | 2012-09-12 | 上海电机学院 | Underground bicycle garage |
| CN203246862U (en) * | 2013-05-10 | 2013-10-23 | 齐祥东 | Storage bin of tube insertion machine |
| CN204024153U (en) * | 2014-07-29 | 2014-12-17 | 王忠利 | A kind of vehicle lifting gear that automatically turns around |
| CN106005929A (en) * | 2016-06-20 | 2016-10-12 | 北京航空航天大学 | Carrying trolley with lifting device and rotating device |
| CN106395289A (en) * | 2016-11-23 | 2017-02-15 | 苏州鑫润旺精密机械有限公司 | Feeding mechanism for oil valve assemblies of brake pump |
| CN106626498A (en) * | 2016-11-30 | 2017-05-10 | 常州机电职业技术学院 | Automatic rotation type tabletting forming machine |
| CN207092641U (en) * | 2017-07-25 | 2018-03-13 | 陕西隆翔停车设备集团有限公司 | A kind of mechanical variable speed rotary and lifting device |
-
2017
- 2017-07-25 CN CN201710613120.2A patent/CN107246168B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040011137A (en) * | 2002-07-29 | 2004-02-05 | 오티스 엘리베이터 컴파니 | Palette driving unit in the elevator turntable-type parking apparatus |
| CN102661068A (en) * | 2012-05-29 | 2012-09-12 | 上海电机学院 | Underground bicycle garage |
| CN203246862U (en) * | 2013-05-10 | 2013-10-23 | 齐祥东 | Storage bin of tube insertion machine |
| CN204024153U (en) * | 2014-07-29 | 2014-12-17 | 王忠利 | A kind of vehicle lifting gear that automatically turns around |
| CN106005929A (en) * | 2016-06-20 | 2016-10-12 | 北京航空航天大学 | Carrying trolley with lifting device and rotating device |
| CN106395289A (en) * | 2016-11-23 | 2017-02-15 | 苏州鑫润旺精密机械有限公司 | Feeding mechanism for oil valve assemblies of brake pump |
| CN106626498A (en) * | 2016-11-30 | 2017-05-10 | 常州机电职业技术学院 | Automatic rotation type tabletting forming machine |
| CN207092641U (en) * | 2017-07-25 | 2018-03-13 | 陕西隆翔停车设备集团有限公司 | A kind of mechanical variable speed rotary and lifting device |
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| CN107246168A (en) | 2017-10-13 |
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