CN115492908A - High-speed transmission device based on ball screw - Google Patents
High-speed transmission device based on ball screw Download PDFInfo
- Publication number
- CN115492908A CN115492908A CN202211001801.0A CN202211001801A CN115492908A CN 115492908 A CN115492908 A CN 115492908A CN 202211001801 A CN202211001801 A CN 202211001801A CN 115492908 A CN115492908 A CN 115492908A
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- ball screw
- chuck
- supporting
- base
- fixed shell
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 24
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000004804 winding Methods 0.000 description 12
- 230000009191 jumping Effects 0.000 description 7
- 238000005381 potential energy Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 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
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H2025/2436—Intermediate screw supports for reducing unsupported length of screw shaft
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention belongs to the technical field of screw transmission, and particularly relates to a high-speed transmission device based on a ball screw, which comprises a bottom bracket, wherein a base is arranged on the upper side of the bottom bracket, a screw supporting device penetrating through the base is arranged above the bottom bracket, the screw supporting device comprises a fixed shell, a supporting chuck is inserted in an inner cavity of the fixed shell, a push rod for driving the supporting chuck to move up and down is arranged at the bottom of the inner cavity of the fixed shell, and a guide wheel is arranged on the inner side of the supporting chuck; the backup pad is all installed to the top left and right sides of base, both sides be connected with rotatable ball between the backup pad, the rotatory motor of drive ball is installed on the top right side of base, the support chuck is located ball's downside, and the relative length of lead screw shortens between two fulcrums of this device, and then avoids ball to produce and beats to make ball can not produce when high-speed transmission and beat.
Description
Technical Field
The invention relates to the technical field of screw transmission, in particular to a high-speed transmission device based on a ball screw.
Background
The ball screw is the most commonly used transmission element on tool machinery and precision machinery, and has the main function of converting rotary motion into linear motion or converting torque into axial repeated acting force, and has the characteristics of high precision, reversibility and high efficiency. However, when the motor drives the ball screw to operate, the ball screw can jump according to the change of the transmission speed, the higher the transmission speed of the ball screw is and the longer the length of the ball screw is, the larger the jumping amplitude of the ball screw is, when the ball screw operates at a high speed, 360-degree circular centrifugal jumping can be generated to enable the equipment to resonate, namely, the jumping of the screw inevitably affects the processing speed and precision of the equipment, the jumping of the screw can also easily cause the damage of the screw, the nut, the guide rail, the sliding block and other parts, and further the stability of the equipment is affected, and at the moment, the mechanical noise can be generated during the operation of the equipment, and the damage can also be caused to the whole equipment.
At present, transmission devices based on ball screws on the market adopt a low-speed running mode to avoid the ball screws from jumping, so that when the ball screws are used for transmission, equipment cannot perform high-speed transmission, namely the processing speed needs to be reduced; in addition, the mode of improving the transmission speed of the ball screw in the prior art is to increase the diameter of the ball screw, so that after the diameter of the ball screw is increased, the transmission speed of the ball screw is increased to be lower, and the diameter of the ball screw is increased, so that the cost of the ball screw is increased, and meanwhile, the energy consumption of equipment loss during operation is also increased, which leads to the increase of the production cost.
Disclosure of Invention
The present invention is directed to a ball screw-based high-speed transmission device, which solves the problem that the conventional ball screw transmission device proposed in the above-mentioned background art cannot perform high-speed transmission.
In order to achieve the purpose, the invention provides the following technical scheme: a high-speed transmission device based on a ball screw comprises a bottom support, wherein a base is installed on the upper side of the bottom support, a screw supporting device penetrating through the base is installed above the bottom support, the screw supporting device comprises a fixed shell, a supporting chuck is inserted into an inner cavity of the fixed shell, a push rod driving the supporting chuck to move up and down is installed at the bottom of the inner cavity of the fixed shell, and a guide wheel is installed on the inner side of the supporting chuck;
the left side and the right side of the upper part of the base are both provided with supporting plates, a rotatable ball screw is connected between the supporting plates at two sides, the right side of the upper part of the base is provided with a motor for driving the ball screw to rotate, a linear guide rail is arranged above the base, a bearing plate is movably arranged above the linear guide rail, and the ball screw is movably connected with the bearing plate;
the support chuck is located on the lower side of the ball screw.
Preferably, photoelectric sensors are embedded in the upper side of the body of the base, and the photoelectric sensors and the lead screw supporting devices are alternately arranged.
Preferably, the support chuck comprises a guide post, chucks are hinged to the front side and the rear side above the guide post, a locking sleeve is movably sleeved on the outer side of the guide post, and the lower end of the locking sleeve is inserted into the inner cavity of the fixed shell.
Preferably, the lower end of the locking sleeve is connected with an auxiliary support frame, and the telescopic rod of the push rod is connected with the auxiliary support frame.
Preferably, be provided with the coiling groove in the inner chamber of fixed shell, movable mounting has the rolling dish in the inner chamber in coiling groove, be connected with reset torsion spring between the inboard of rolling dish and the fixed shell, the outside of rolling dish is connected with wire rope, wire rope's the other end runs through auxiliary support frame and lock sleeve and is connected with the guide post, be connected with thrust spring between the lower extreme of guide post and the inner chamber bottom of lock sleeve.
Preferably, a limiting block is arranged below the outer side of the guide column, and a limiting groove corresponding to the limiting block is arranged in the inner cavity of the locking sleeve.
Preferably, the upper side of the body of the guide post is provided with an outward pushing groove, an inner cavity of the outward pushing groove is internally provided with a return spring, and the upper end of the return spring is connected with the chuck.
Preferably, the guide wheel is provided with a fixing plate on one side close to the chuck, and the fixing plate is connected with the chuck through a bolt.
Compared with the prior art, the invention has the beneficial effects that:
1) The device supports the ball screw through the screw support device, so that the ball screw has a plurality of fulcrums, and due to the existence of the screw support device, the relative length of the screw between the two fulcrums is shortened, so that the ball screw is prevented from jumping, and the ball screw cannot jump during high-speed transmission;
2) This device drives through the push rod and supports the chuck and reciprocate, and when the bearing plate was close to and is close to lead screw strutting arrangement, the push rod drove and supports the chuck and descend, can avoid the bearing plate, leaves lead screw strutting arrangement at the bearing plate after, the push rod drives and supports the chuck and go upward, supports ball once more, and then makes the removal of bearing plate not disturbed to ball has been ensured and ball can carry out high-speed transmission.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic view of a lead screw supporting device according to the present invention;
FIG. 4 is a schematic left side view cross-sectional structural view of the lead screw support apparatus of the present invention;
FIG. 5 is a schematic view of the support chuck of the present invention.
In the figure: the device comprises a bottom support 1, a base 2, a support plate 3, a motor 4, a bearing plate 5, a linear guide rail 6, a lead screw support device 7, a fixed shell 71, a locking sleeve 72, a guide wheel 73, a supporting chuck 74, a guide post 741, a limiting block 742, a chuck 743, a 744 return spring, a thrust spring 75, an auxiliary supporting frame 76, a push rod 77, a reset torsion spring 78, a winding disc 79, a ball screw 8 and a photoelectric sensor 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The embodiment is as follows:
referring to fig. 1-5, the present invention provides a technical solution: a high-speed transmission device based on a ball screw comprises a bottom bracket 1, a base 2 is installed on the upper side of the bottom bracket 1, supporting plates 3 are installed on the left side and the right side of the upper portion of the base 2, a rotatable ball screw 8 is connected between the supporting plates 3 on the two sides, a screw supporting device 7 penetrating through the base 2 is installed above the bottom bracket 1, the screw supporting device 7 comprises a fixed shell 71, the fixed shell 71 is fixed on the bottom bracket 1 through bolts, a supporting chuck 74 is inserted into an inner cavity of the fixed shell 71, a push rod 77 driving the supporting chuck 74 to move up and down is installed at the bottom of the inner cavity of the fixed shell 71, the supporting chuck 74 moves upwards to support the ball screw 8, and further a fulcrum of the ball screw 8 is increased, so that the ball screw 8 is prevented from jumping during high-speed transmission, a guide wheel 73 is installed on the inner side of the supporting chuck 74, when the ball screw 8 is supported, the guide wheel 73 is attached to the ball screw 8, friction force generated when the ball screw 8 rotates is reduced through rotation of the guide wheel 73, the material of the nylon or red copper guide wheel is a nylon or red copper guide wheel, the ball guide wheel 8 cannot damage the ball screw 8, and the ball screw can be more than three times of the lead 73, so that the ball screw 8 is tangential to enable the ball screw to be always, and the ball screw 73, and the lead 73 to be more than three times of the ball screw 8;
the motor 4 of 8 rotations of drive ball is installed on the top right side of base 2, motor 4 is servo motor, step motor or linear electric motor, linear guide 6 is installed to the top of base 2, linear guide 6's top movable mounting has bearing plate 5, external equipment can pass through the top of bolt fastening to bearing plate 5, bearing plate 5 is connected through ball slider with linear guide 6, is connected through ball nut between ball 8 and the bearing plate 5.
The supporting chuck 74 comprises a guide column 741, a locking sleeve 72 is movably sleeved outside the guide column 741, the locking sleeve 72 is used for limiting the guide column 741, the locking sleeve 72 only can move up and down, the front side and the rear side above the guide column 741 are respectively hinged with a chuck 743, meanwhile, the locking sleeve 72 can drive the supporting chuck 74 to move up in the moving up process, when the supporting chuck 74 moves to the upper limit, the locking sleeve 72 which continuously moves up can push the chuck 743 to be closed, further, the ball screw 8 is clamped and fixed, the lower end of the locking sleeve 72 is inserted into an inner cavity of the fixed shell 71, the fixed shell 71 is used for limiting the locking sleeve 72, and the locking sleeve 72 only can move up and down.
The lower extreme of lock sleeve 72 is connected with assists and props frame 76, the inner chamber of fixed shell 71 has a little square groove and a big square groove to constitute, big square groove is located the downside in little square groove, assist and prop frame 76 and big square groove adaptation, it is spacing to assist through big square groove to prop frame 76, make to assist and prop frame 76 and only can reciprocate, it is spacing to assisting to prop frame 76 through little square groove, it can only remove in big square inslot to make to assist and prop frame 76, the telescopic link of push rod 77 is connected with assisting and props frame 76.
A winding groove is formed in the inner cavity of the fixed shell 71, a winding disc 79 is movably mounted in the inner cavity of the winding groove, a reset torsion spring 78 is connected between the inner side of the winding disc 79 and the fixed shell 71, a steel wire rope is connected to the outer side of the winding disc 79, the other end of the steel wire rope penetrates through the auxiliary support frame 76 and the locking sleeve 72 and is connected with the guide column 741, the steel wire rope is used for limiting the support chuck 74, the steel wire rope wound on the outer side of the winding disc 79 is discharged along with the ascending of the support chuck 74, after the steel wire rope is completely discharged, the support chuck 74 moves to the upper limit, when the winding disc 79 discharges the steel wire rope through rotation, the rotation of the winding disc 79 also drives the reset torsion spring 78 to store potential energy, when the support chuck 74 descends, the reset torsion spring 78 releases the potential energy to drive the winding disc 79 to rotate the steel wire rope, further, the steel wire rope exposed outside is prevented from being wound, and a thrust spring 75 is connected between the lower end of the guide column 741 and the bottom of the inner cavity of the locking sleeve 72.
A limiting block 742 is arranged below the outer side of the guide column 741, a limiting groove corresponding to the limiting block 742 is formed in the inner cavity of the locking sleeve 72, the guide column 741 can move up and down in the locking sleeve 72 under the limitation of the limiting block 742 and the limiting groove, namely after the locking sleeve 72 moves down for a certain distance, the guide column 741 can be driven by the locking sleeve 72 through the limiting block 742 to move down, and the reset torsion spring 78 is not needed to overcome the elasticity of the thrust spring 75 to do work.
An outward pushing groove is formed in the upper side of the body of the guide column 741, a return spring 744 is installed in an inner cavity of the outward pushing groove, the upper end of the return spring 744 is connected with the chuck 743, and when the locking sleeve 72 descends, the return spring 744 can push the chuck 743 to rotate, so that the chuck 743 is separated from the ball screw 8.
The guide wheel 73 is provided with a fixing plate at a side close to the clamp 743, and the fixing plate is connected with the clamp 743 through a bolt, so that the guide wheel 73 can be detached, and the worn guide wheel 73 can be conveniently replaced.
The working principle is as follows: when the motor 4 rotates forwards, the motor 4 drives the ball screw 8 to rotate, the ball screw 8 drives the bearing plate 5 to move leftwards through rotation, and when the photoelectric sensor 9 senses the bearing plate 5, the screw support device 7 on the left side of the photoelectric sensor 9 moves downwards, and meanwhile, the screw support device 7 on the right side of the photoelectric sensor 9 moves upwards;
when the motor 4 rotates reversely, the motor 4 drives the ball screw 8 to rotate, the ball screw 8 drives the bearing plate 5 to move right through rotation, when the photoelectric sensor 9 senses the bearing plate 5, the screw support device 7 on the right side of the photoelectric sensor 9 moves downwards, and meanwhile, the screw support device 7 on the left side of the photoelectric sensor 9 moves upwards;
when the screw supporting device 7 moves upwards, the push rod 77 pushes the auxiliary supporting frame 76 to move upwards, the auxiliary supporting frame 76 pushes the locking sleeve 72 to move upwards, the locking sleeve 72 pushes the supporting chuck 74 to move upwards through the thrust spring 75, the supporting chuck 74 moves upwards to drive the winding disc 79 to rotate and release the steel wire rope, after the steel wire rope is completely released, the supporting chuck 74 moves to the upper limit, and at the moment, the locking sleeve 72 moves upwards continuously, the upper end of the locking sleeve 72 enables the chucks 743 on the supporting chuck 74 to be close to each other through pressure, and meanwhile, the guide wheels 73 on the chucks 743 are also closed to each other, so that the ball screw 8 is clamped;
when the screw supporting device 7 moves downwards, the push rod 77 drives the locking sleeve 72 to move downwards through the auxiliary supporting frame 76, at the moment, the thrust spring 75 releases elastic potential energy, so that the supporting chuck 74 is kept in the original position, after the locking sleeve 72 moves downwards and is separated from the chuck 743, the reset spring 744 pushes the chuck 743 to expand, the chuck 743 loosens the ball screw 8, when the locking sleeve 72 continues to move downwards, the locking sleeve 72 drives the limiting block 742 to move downwards through the limiting groove, the limiting block 742 drives the supporting chuck 74 to move downwards, the supporting chuck 74 moves downwards to release the steel wire rope, and at the moment, the reset torsion spring 78 releases elastic potential energy to drive the winding disc 79 to wind the steel wire rope.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other embodiments without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A high-speed transmission device based on a ball screw comprises a bottom bracket (1) and is characterized in that: the upper side of the bottom support (1) is provided with a base (2), a lead screw supporting device (7) penetrating through the base (2) is arranged above the bottom support (1), the lead screw supporting device (7) comprises a fixed shell (71), a supporting chuck (74) is inserted into an inner cavity of the fixed shell (71), a push rod (77) driving the supporting chuck (74) to move up and down is arranged at the bottom of the inner cavity of the fixed shell (71), and a guide wheel (73) is arranged on the inner side of the supporting chuck (74);
the left side and the right side above the base (2) are both provided with supporting plates (3), a rotatable ball screw (8) is connected between the supporting plates (3) on two sides, a motor (4) for driving the ball screw (8) to rotate is mounted on the right side above the base (2), a linear guide rail (6) is mounted above the base (2), a bearing plate (5) is movably mounted above the linear guide rail (6), and the ball screw (8) is movably connected with the bearing plate (5);
the support chuck (74) is located on the underside of the ball screw (8).
2. A ball screw based high speed drive according to claim 1, wherein: photoelectric sensors (9) are embedded on the upper side of the body of the base (2), and the photoelectric sensors (9) and the lead screw supporting devices (7) are alternately arranged.
3. A ball screw based high speed drive according to claim 1, wherein: the supporting chuck (74) comprises guide columns (741), the front side and the rear side of the upper portion of each guide column (741) are hinged to a chuck (743), a locking sleeve (72) is movably sleeved on the outer side of each guide column (741), and the lower end of each locking sleeve (72) is inserted into an inner cavity of the corresponding fixed shell (71).
4. A ball screw based high speed drive according to claim 3, wherein: the lower extreme of lock sleeve (72) is connected with assists and props frame (76), the telescopic link of push rod (77) is connected with assists and props frame (76).
5. A ball screw based high speed drive according to claim 4, wherein: be provided with in the inner chamber of fixed shell (71) and wrap up the groove, movable mounting has rolling dish (79) in the inner chamber in rolling groove, be connected with reset torsion spring (78) between the inboard of rolling dish (79) and fixed shell (71), the outside of rolling dish (79) is connected with wire rope, wire rope's the other end runs through and assists braced frame (76) and lock sleeve (72) and is connected with guide post (741), be connected with thrust spring (75) between the lower extreme of guide post (741) and the inner chamber bottom of lock sleeve (72).
6. A ball screw based high speed drive according to claim 3, wherein: a limiting block (742) is arranged below the outer side of the guide column (741), and a limiting groove corresponding to the limiting block (742) is formed in the inner cavity of the locking sleeve (72).
7. A ball screw based high speed drive according to claim 3, wherein: an outward pushing groove is formed in the upper side of the body of the guide column (741), a return spring (744) is installed in an inner cavity of the outward pushing groove, and the upper end of the return spring (744) is connected with the clamping head (743).
8. A ball screw based high speed drive according to claim 3, wherein: the guide wheel (73) is provided with a fixed plate at one side close to the chuck (743), and the fixed plate is connected with the chuck (743) through a bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211001801.0A CN115492908A (en) | 2022-08-20 | 2022-08-20 | High-speed transmission device based on ball screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211001801.0A CN115492908A (en) | 2022-08-20 | 2022-08-20 | High-speed transmission device based on ball screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115492908A true CN115492908A (en) | 2022-12-20 |
Family
ID=84466272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211001801.0A Withdrawn CN115492908A (en) | 2022-08-20 | 2022-08-20 | High-speed transmission device based on ball screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115492908A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116553440A (en) * | 2023-04-14 | 2023-08-08 | 云南建源电力器材有限公司 | Anti-falling device for overhead operation of power transmission line |
-
2022
- 2022-08-20 CN CN202211001801.0A patent/CN115492908A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116553440A (en) * | 2023-04-14 | 2023-08-08 | 云南建源电力器材有限公司 | Anti-falling device for overhead operation of power transmission line |
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Application publication date: 20221220 |