CN210366783U - Three-in-one internal translation electric hoist winch - Google Patents
Three-in-one internal translation electric hoist winch Download PDFInfo
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- CN210366783U CN210366783U CN201921187856.9U CN201921187856U CN210366783U CN 210366783 U CN210366783 U CN 210366783U CN 201921187856 U CN201921187856 U CN 201921187856U CN 210366783 U CN210366783 U CN 210366783U
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Abstract
The utility model relates to a three-in-one inner-phase electric hoist winch device, which comprises a winding drum, wherein one end of the winding drum is welded with a winding drum end plate, and the circumference outer ring of the other end is provided with a shell support ring through a roller; the outer layer of the winding drum is provided with a gourd shell, one end of the gourd shell is welded with a shell supporting plate, the middle part of the shell supporting plate is provided with a winding drum shaft through a rolling bearing, and one end of the winding drum shaft is welded with the winding drum end plate; an inner tooth end plate connected with the inner wall of the winding drum is welded in the winding drum, a hole is formed in the middle of the winding drum, and inner teeth are machined in the hole; still include interior parallel gear speed reducer, its structure is: the speed reducer comprises a primary shunting speed reducer device and a secondary speed reducer mechanism which are sequentially connected, wherein the output end of the speed reducer device is a speed reducer output shaft, and the shaft end of the speed reducer device is meshed with the inner teeth; one end of the first-stage shunt speed reduction device is connected with a motor output shaft of the disc motor, a motor braking shaft of the disc motor is connected with a safety brake, and the safety brake is connected with the shell support ring. The utility model discloses work efficiency and workshop utilization ratio have greatly been improved.
Description
Technical Field
The utility model belongs to the technical field of the hoisting device technique and specifically relates to a trinity interior translational electric block hoisting device.
Background
The existing common steel wire rope electric hoist hoisting device consists of a conical rotor motor, a winding drum and a speed reducer, the three are connected in series to form a straight line, the conical rotor motor is positioned at one end of the winding drum, the speed reducer is positioned at the other end of the winding drum and is connected with the other end of the winding drum through a shaft and a coupler, and the structure of the hoisting device has the problems that: because the two ends are respectively provided with the conical motor and the speed reducer, the electric hoist cannot reach the two sides of the workshop in the space of at least 1/3, and the utilization rate of the workshop is greatly reduced; the transmission system is characterized in that a conical motor shaft is transmitted to a drum shaft and then to a reducer shaft, the shaft system is long, the risk of shaft breakage is high, a low-speed shaft safety brake is not provided, and all safety is low; the efficiency of the conical rotor motor is low, and the working efficiency is also low; the lifting speed is difficult to be lifted again due to the limitation of the existing conical rotor motor.
The speed reducer of the existing C-shaped structure electric hoist is arranged on the side surfaces of a winding drum and a motor, the motor is positioned below the winding drum, the structure is heavier, the structure is balanced only by a counterweight structure, and the interference of a lifting hook can be avoided; and the hoist is influenced by the size of the motor, so that the hoisting capacity and the hoisting speed are limited.
SUMMERY OF THE UTILITY MODEL
The applicant provides a rational in infrastructure trinity interior flat-bed electric hoist hoisting device to the shortcoming among the above-mentioned prior production technique to improve work efficiency and workshop utilization ratio, reduced the disconnected axle risk.
The utility model discloses the technical scheme who adopts as follows:
a three-in-one inner-swinging electric hoist winch comprises a winding drum, wherein one end of the winding drum is welded with a winding drum end plate, the circumferential outer ring of the other end of the winding drum is provided with a shell support ring through a roller, and the outer end surface of the shell support ring is connected with a safety brake; the outer layer of the winding drum is provided with a thin-wall cylindrical gourd shell, one end of the winding drum is welded with a shell supporting plate, and the other end of the winding drum is attached to the inner end face of the shell supporting ring; a winding drum shaft is arranged in the middle of the shell supporting plate through a rolling bearing, and one end of the winding drum shaft is welded with the winding drum end plate; the inner tooth end plate connected with the inner wall of the winding drum is welded in the winding drum, a through hole is formed in the middle of the winding drum, the winding drum is in transmission connection with the output end of the inner translational gear speed reducer through inner teeth arranged on the inner circumferential surface of the through hole, the input end of the inner translational gear speed reducer is connected with the disc motor, and the disc motor is in transmission connection with the safety brake; the structure of interior parallel gear speed reducer does: the disc type motor speed reducer comprises a first-stage shunt speed reducer and a second-stage speed reducer which are sequentially connected, wherein the output end of the first-stage shunt speed reducer is a speed reducer output shaft, the first-stage shunt speed reducer is connected with a motor output shaft of a disc type motor, and a motor braking shaft of the disc type motor is connected with a safety brake.
As a further improvement of the above technical solution:
the safety brake adopts an electromagnetic disc brake, and the structure of the safety brake is as follows: the brake device comprises a mounting disc, an armature and a magnetic yoke which are sequentially mounted along the axial direction and connected into a whole through countersunk bolts, wherein a friction disc is mounted at a gap between the mounting disc and the armature and is of a T-shaped structure, a protruding end at the middle part of the friction disc extends into a through hole formed in the middle part of the magnetic yoke, the magnetic yoke is positioned on an outer ring of the through hole, a plurality of counter bores provided with brake springs are axially formed in the magnetic yoke, and free ends of the brake springs are abutted to the armature; the circumferential end face of the magnet yoke is provided with a circular wire slot, and a coil is wound in the wire slot.
The protruding end in the middle of the friction disc is of a tubular structure, and the inner wall of the protruding end is provided with an inner gear ring matched with the shaft end of a motor brake shaft; the outer ring of the circumference of the friction disk is hot-pressed with a layer of friction lining, and the outer end surface of the friction disk of the inner ring of the friction lining is hot-pressed with a back disk.
The safety brake is connected with the shell support ring through the mounting disc and the countersunk head bolt; one end face of the disc type motor is connected with the mounting disc through a bolt, the other end face of the disc type motor is attached to the end face of the shell of the inner translational gear speed reducer, and the shell of the inner translational gear speed reducer and the output shaft of the speed reducer rotate together.
The shaft end of the motor braking shaft is provided with a spline housing matched with the safety brake, and the spline housing is of a cylindrical structure.
Three shunt gears are arranged in the first-stage shunt reduction gear, are positioned on the outer ring of the motor output shaft and are matched with the motor output shaft, and are uniformly distributed at 120 degrees along the circumferential direction; the shunt gears are external gears, gear shafts of all the shunt gears are eccentric shafts, and large external gears are mounted on the eccentric shafts and serve as input gears of a secondary speed reduction mechanism of the internal parallel gear speed reducer.
The rollers are uniformly distributed along the outer ring of the winding drum, and a circular retaining ring is arranged between the end face of each roller and the safety brake.
The winding drum is formed by processing seamless steel pipes, and the outer surface of the winding drum is processed with a rope groove for winding a steel wire rope.
The utility model has the advantages as follows:
the utility model has the advantages of small structure volume, light weight, compact structure, three-in-one of a safety brake, a disc type motor and a speed reducer, and the motor adopts a special disc type motor, and the flat structure of the motor has small volume, short axial size, high power density and efficiency; the speed reducer adopts an internal translational gear speed reducer, has small volume, short axial size and large transmission ratio, reduces speed in two stages, and theoretically has a speed ratio of 1000; the safety brake adopts an electromagnetic disc type brake, the friction disc, the mounting disc and the armature iron form two friction pairs respectively to form double braking, and the transmission efficiency and the working efficiency are greatly improved. And simultaneously, the utility model discloses still have following advantage:
the utility model has small axial size and high workshop utilization rate, compared with the traditional wire rope electric block, the motor, the speed reducer and the brake are uniformly arranged in the winding drum, the size of the motor and the speed reducer is axially saved, the effective distance of the electric block running along the I-shaped steel is larger, the lifting hook of the electric block can be closer to the two sides of the workshop, and the workshop utilization rate is greatly improved;
the utility model discloses a disc motor, speed reducer, stopper are trinity, do not have the jackshaft, and the shafting is short, does not have the coupling joint, disconnected axle risk greatly reduced.
The utility model discloses the overload capacity is strong, and reel intensity is big. Because the internal tooth end plate is arranged in the winding drum, the support of the winding drum wall is more reasonable, and the bearing capacity of the winding drum is improved;
the utility model discloses adaptation environmental scope is wide, because motor, speed reducer and stopper equipartition are put inside the reel, can realize with operational environment's isolation, be particularly suitable for being used in explosion-proof occasion, high temperature occasion, low temperature occasion, corrosivity occasion, moist occasion, rainy and snowy occasion and close the abominable occasion in environment.
The utility model discloses can improve the lifting speed through modes such as increasing reel diameter, increasing motor speed, not receive the restriction that reel, speed reducer and motor structure arranged.
The utility model has beautiful appearance. The size of the traditional steel wire rope electric hoist shell is inconsistent with the sizes of the circular surfaces of the motor and the speed reducer, and the appearance of the motor and the speed reducer is irregular.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a left side view of the winding drum of the present invention.
Fig. 3 is a front view of the safety brake of the present invention.
Fig. 4 is a schematic structural view of the friction disc of the present invention.
Fig. 5 is a schematic structural diagram of the mounting plate of the present invention.
Fig. 6 the utility model discloses shunt gear and motor output shaft's spline housing complex schematic structure.
Wherein: 1. a housing support plate; 2. a spool shaft; 3. a rolling bearing; 4. a drum end plate; 5. a gourd shell; 6. a reel; 7. an output shaft of the reducer; 8. an internally toothed end plate; 9. an inner translational gear reducer; 10. a first stage shunt reduction gear; 11. an output shaft of the motor; 12. a disc motor; 13. a motor brake shaft; 14. a roller; 15. a housing support ring; 16. a safety brake; 17. a countersunk bolt; 18. rope groove tooth crest; 19. a drum rope groove root; 20. the inner wall of the winding drum; 21. internal teeth; 22. installing bolt holes; 23. a spline housing; 24. mounting a disc; 25. a magnetic yoke; 26. a brake spring; 27. an armature; 28. a coil; 29. a friction disk; 30. a friction pad; 31. a back plate; 32. a shunt gear; 33. a retainer ring; 34. and the inner gear ring.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and fig. 2, the three-in-one internal-translation electric hoist hoisting device of the present embodiment includes a winding drum 6, one end of which is welded with a winding drum end plate 4, a circumferential outer ring of the other end of which is provided with a casing support ring 15 through a roller 14, and an outer end surface of the casing support ring 15 is connected with a safety brake 16; the outer layer of the winding drum 6 is provided with a thin-wall cylindrical gourd shell 5, one end of the winding drum is welded with a shell supporting plate 1, and the other end of the winding drum is attached to the inner end face of a shell supporting ring 15; a winding drum shaft 2 is arranged in the middle of the shell support plate 1 through a rolling bearing 3, and one end of the winding drum shaft 2 is welded with a winding drum end plate 4; an internal tooth end plate 8 connected with the inner wall of the winding drum 6 is welded inside the winding drum, a through hole is formed in the middle of the winding drum, the winding drum is in transmission connection with the output end of an internal translational gear speed reducer 9 through internal teeth 21 arranged on the inner circumferential surface of the through hole, the input end of the internal translational gear speed reducer 9 is connected with a disc motor 12, and the disc motor 12 is in transmission connection with a safety brake 16;
the structure of the internal translational gear speed reducer 9 is as follows: the device comprises a first-stage shunt reduction gear 10 and a second-stage reduction mechanism which are sequentially connected, wherein the output end of the first-stage shunt reduction gear is a reduction gear output shaft 7, the first-stage shunt reduction gear 10 is connected with a motor output shaft 11 of a disc motor 12, and a motor braking shaft 13 of the disc motor 12 is connected with a safety brake 16.
As shown in fig. 3 to 6, the safety brake 16 is an electromagnetic disc brake, and has a structure that: the brake device comprises a mounting disc 24, an armature 27 and a magnetic yoke 25 which are sequentially mounted along the axial direction and connected into a whole through a sunk bolt 17, wherein a friction disc 29 is mounted at a gap between the mounting disc 24 and the armature 27 and is of a T-shaped structure, a protruding end in the middle of the mounting disc extends into a through hole formed in the middle of the magnetic yoke 25, a plurality of sunk holes provided with brake springs 26 are formed in the outer ring of the through hole on the magnetic yoke 25 along the axial direction, and the free ends of the brake springs 26 are abutted to the armature 27; the circumferential end face of the magnet yoke 25 is provided with a circular wire slot, and a coil 28 is wound in the wire slot.
As shown in fig. 4, the protruding end of the middle part of the friction disc 29 is tubular, and the inner wall of the protruding end is provided with an inner gear ring 34 matched with the shaft end of the motor brake shaft 13; a friction lining 30 is hot pressed on the circumferential outer ring of the friction disc 29, and a back disc 31 is hot pressed on the outer end face of the friction disc 29 on the inner ring of the friction lining 30.
The safety brake 16 is connected with the shell supporting ring 15 through a mounting disc 24 and a countersunk bolt 17; one end face of the disc motor 12 is connected with the mounting disc 24 through a bolt, the other end face of the disc motor is attached to the end face of the shell of the inner translational gear speed reducer 9, and the shell of the inner translational gear speed reducer 9 and the speed reducer output shaft 7 rotate together.
The spline housing 23 matched with the safety brake 16 is installed at the shaft end of the motor brake shaft 13 and is of a cylindrical structure.
As shown in fig. 6, three shunt gears 32 are arranged in the first-stage shunt reduction gear 10, the three shunt gears 32 are located on the outer ring of the motor output shaft 11 and are simultaneously matched with the motor output shaft, and the three shunt gears 32 are uniformly distributed along the circumferential direction at 120 degrees; the split gears 32 are external gears, the gear shaft of each split gear 32 is an eccentric shaft, and a large external gear is mounted on the eccentric shaft and serves as an input gear of the secondary speed reduction mechanism of the internal translational gear speed reducer 9.
The rollers 14 are uniformly distributed along the outer ring of the winding drum 6, and an annular retainer ring 33 is arranged between the end surface of the roller 14 and the safety brake 16.
The winding drum 6 is made of seamless steel tubes, and the outer surface of the winding drum is provided with a rope groove for winding a steel wire rope.
The design principle of the utility model is as follows:
the shell supporting plate 1 is an end plate of the gourd shell 5, and a bearing hole is formed in the middle of the shell supporting plate; the drum shaft 2 is a driven shaft and is welded with the drum end plate 4; the rolling bearing 3 is in interference fit with a bearing hole of the shell supporting plate and supports the drum shaft 2; the winding drum end plate 4 is welded at the end part of the winding drum 6, and the winding drum shaft 2 is welded in the middle of the winding drum end plate to play a role in transmitting torque and enhancing the bearing capacity of the winding drum; the hoist shell 5 is a shell of the whole electric hoist and plays a role in mounting and fixing other parts and bearing weight and torque; the winding drum 6 is formed by processing a seamless steel pipe, a rope groove is processed on the outer surface of the seamless steel pipe, a steel wire rope can be wound in the rope groove, and the winding drum can lift and place a heavy object by winding the steel wire rope out; the inner tooth end plate 8 is a circular plate with inner teeth 21 machined in the middle, and the outer edge of the inner tooth end plate is welded with the inner wall of the winding drum to play a role in transmitting torque and rotating speed and enhancing the bearing capacity of the winding drum 6; the rollers 14 are distributed on the circumference to support the winding drum 8, so that the rolling resistance is reduced; and the shell support ring 15 is welded on the end surface of the hoist shell 5 and plays a role in fixing and supporting the roller 14.
The internal translational gear reducer 9 consists of a reducer output shaft 7, a primary shunt reduction gear 10 and an internal gear mechanism, and is characterized in that the shell of the reducer rotates together with the reducer output shaft 7, the reduction ratio is large, the transmission torque is large, the overload capacity is strong, and the volume is small; the first-stage shunting reduction gear 10 is a part of the inner translational reduction gear 9 and consists of three large external gears, the motor output shaft 11 inputs the rotating speed and the torque, a spline is processed at the end part and is meshed with the shunting gear 32 to reduce the speed for the first time, and the inner gear ring is driven through the meshing of the three shunting gears 32 and the inner gear ring 32, so that the reduction gear output shaft 7 is driven; the reducer output shaft 7 is structurally connected with an inner gear ring in the inner parallel gear reducer 9, rotates along with the rotation of the inner gear ring, is meshed with the inner teeth 21 through an outer tooth spline at the shaft end, and transmits torque and rotation speed to the inner tooth end plate 8 so as to drive the winding drum 6 to rotate;
the motor brake shaft 13 is a flat key shaft and is connected with a spline sleeve 23 key of the safety brake 16; the spline housing 23 is a cylinder, the external spline is engaged with the inner gear ring 34 of the friction disk 29, the inner wall is provided with a key slot and is connected with the motor brake shaft 13 through a key;
the mounting disc 24 is used for fixing the safety brake 16 on the shell support ring 15 through the countersunk head bolt 17, and mounting and fixing the special disc type motor 12, and meanwhile, the mounting disc serves as a second brake disc;
the magnetic yoke 25 is made of soft iron, and plays a role in transmitting magnetic lines and serving as a brake shell; the braking springs 26 are cylindrical springs and are uniformly distributed in the circumferential direction and used for generating braking force; an armature 27, a disc made of soft iron, which acts as a closed magnetic circuit and acts as a brake disc; a coil 28 energized to generate a magnetic field;
and a countersunk bolt 17 fixing the safety brake 16 to the housing support ring 15.
As shown in fig. 2, the rope groove tooth crest 18 is a drum rope groove tooth crest, and the rope groove tooth crest 19 is a drum rope groove root; the inner wall 20 of the winding drum is the inner surface of the winding drum 6; and internal teeth 21 located at the center of the internal-tooth end plate 8 and engaged with the external teeth of the reducer output shaft 7.
As shown in fig. 5, the mounting bolt holes 22 are used for matching with bolts to mount the safety brake 16 on the housing support ring 15 and fix the special disc motor 12 on the mounting disc 24.
The three shunt gears 32 are external gears which are distributed at 120 degrees uniformly, a gear shaft is an eccentric shaft, and a large external gear is arranged on the eccentric shaft and is used as a secondary speed reduction input gear of the internal translational speed reducer 9; and the retainer ring 33 is of a circular ring structure and is used for sealing the roller.
The utility model discloses in the implementation, 12 circular telegrams backs of disk motor, 16 coil 28 of safety brake switch on simultaneously, and magnetic force pulling armature 27 makes it break away from friction disk 29, and disk motor 12 drives interior translational gear speed reducer 9 and rotates, and friction disk 29 together with motor brake shaft 13 together free rotation simultaneously, the inside tooth end plate 8 of 7 meshing of speed reducer output shafts of interior translational gear speed reducer 9 to drive reel 6 and rotate. The rollers 14 and the femoral bearing 3 support the two ends of the drum, respectively.
When the brake is stopped, the coils of the disc motor 12 and the safety brake 16 are simultaneously de-energized, the magnetic force disappears, the armature 27 is pressed on the friction disc 29 under the action of the elastic force of the brake spring 26, the friction disc 29 is contacted with the mounting disc 24, and the friction disc 29 forms two friction pairs with the armature 27 and the mounting disc 24 respectively to brake the winding drum 6.
The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.
Claims (8)
1. The utility model provides a trinity interior flat electric hoist hoisting device which characterized in that: the winding drum comprises a winding drum (6), wherein one end of the winding drum is welded with a winding drum end plate (4), the circumferential outer ring of the other end of the winding drum is provided with a shell supporting ring (15) through a roller (14), and the outer end surface of the shell supporting ring (15) is connected with a safety brake (16); the outer layer of the winding drum (6) is provided with a thin-wall cylindrical gourd shell (5), one end of the winding drum is welded with a shell supporting plate (1), and the other end of the winding drum is attached to the inner end face of a shell supporting ring (15);
a winding drum shaft (2) is mounted in the middle of the shell supporting plate (1) through a rolling bearing (3), and one end of the winding drum shaft (2) is welded with the winding drum end plate (4); an internal tooth end plate (8) connected with the inner wall of the winding drum (6) is welded in the winding drum, a through hole is formed in the middle of the winding drum, the winding drum is in transmission connection with the output end of an internal translational gear speed reducer (9) through internal teeth (21) arranged on the inner circumferential surface of the through hole, the input end of the internal translational gear speed reducer (9) is connected with a disc motor (12), and the disc motor (12) is in transmission connection with the safety brake (16);
the structure of the inner translational gear speed reducer (9) is as follows: the automatic speed reducer comprises a first-stage shunt speed reducer (10) and a second-stage speed reducer which are sequentially connected, wherein the output end of the first-stage shunt speed reducer is a speed reducer output shaft (7), the first-stage shunt speed reducer (10) is connected with a motor output shaft (11) of a disc motor (12), and a motor braking shaft (13) of the disc motor (12) is connected with a safety brake (16).
2. The hoist apparatus of claim 1, wherein: the safety brake (16) adopts an electromagnetic disc brake, and the structure is as follows: the brake device comprises a mounting disc (24), an armature (27) and a magnetic yoke (25) which are sequentially mounted along the axial direction and connected into a whole through a countersunk bolt (17), wherein friction discs (29) are mounted at intervals between the mounting disc (24) and the armature (27) and are of a T-shaped structure, the protruding end of the middle part of the mounting disc extends into a through hole formed in the middle part of the magnetic yoke (25), the magnetic yoke (25) is positioned on the outer ring of the through hole, a plurality of counter bores provided with brake springs (26) are formed in the axial direction, and the free ends of the brake springs (26) are abutted to the armature (27); the circumferential end surface of the magnet yoke (25) is provided with a circular wire slot, and a coil (28) is wound in the wire slot.
3. The three-in-one inner-translation electric hoist winch device according to claim 2, characterized in that: the protruding end of the middle part of the friction disc (29) is of a tubular structure, and the inner wall of the protruding end is provided with an inner gear ring (34) matched with the shaft end of the motor brake shaft (13); a friction lining (30) is hot-pressed on the circumferential outer ring of the friction disc (29), and a back disc (31) is hot-pressed on the outer end face of the friction disc (29) of the inner ring of the friction lining (30).
4. The three-in-one inner-translation electric hoist winch device according to claim 2, characterized in that: the safety brake (16) is connected with the shell supporting ring (15) through the mounting disc (24) and the countersunk head bolt (17); one end face of the disc type motor (12) is connected with the mounting disc (24) through bolts, the other end face of the disc type motor is attached to the end face of the shell of the inner translational gear speed reducer (9), and the shell of the inner translational gear speed reducer (9) and the speed reducer output shaft (7) rotate together.
5. The hoist apparatus of claim 1, wherein: the shaft end of the motor brake shaft (13) is provided with a spline sleeve (23) matched with the safety brake (16), and the spline sleeve is of a cylindrical structure.
6. The hoist apparatus of claim 1, wherein: three shunt gears (32) are arranged in the first-stage shunt reduction gear (10), the three shunt gears (32) are positioned on the outer ring of the motor output shaft (11) and are matched with the motor output shaft, and the three shunt gears (32) are uniformly distributed at 120 degrees along the circumferential direction; the shunt gears (32) are external gears, the gear shaft of each shunt gear (32) is an eccentric shaft, and a large external gear is mounted on the eccentric shaft and serves as an input gear of a secondary speed reduction mechanism of the internal translational gear speed reducer (9).
7. The hoist apparatus of claim 1, wherein: the rollers (14) are uniformly distributed along the outer ring of the winding drum (6), and an annular retainer ring (33) is arranged between the end face of the roller (14) and the safety brake (16).
8. The hoist apparatus of claim 1, wherein: the winding drum (6) is formed by processing seamless steel pipes, and a rope groove for winding a steel wire rope is processed on the outer surface of the winding drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921187856.9U CN210366783U (en) | 2019-07-25 | 2019-07-25 | Three-in-one internal translation electric hoist winch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921187856.9U CN210366783U (en) | 2019-07-25 | 2019-07-25 | Three-in-one internal translation electric hoist winch |
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| Publication Number | Publication Date |
|---|---|
| CN210366783U true CN210366783U (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921187856.9U Active CN210366783U (en) | 2019-07-25 | 2019-07-25 | Three-in-one internal translation electric hoist winch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210366783U (en) |
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2019
- 2019-07-25 CN CN201921187856.9U patent/CN210366783U/en active Active
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