CN110044696A - A kind of resistance to sharp comer test device of rope and its test method - Google Patents
A kind of resistance to sharp comer test device of rope and its test method Download PDFInfo
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- CN110044696A CN110044696A CN201910283193.9A CN201910283193A CN110044696A CN 110044696 A CN110044696 A CN 110044696A CN 201910283193 A CN201910283193 A CN 201910283193A CN 110044696 A CN110044696 A CN 110044696A
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- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 238000010998 test method Methods 0.000 title claims abstract description 18
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- 238000001514 detection method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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Abstract
The present invention provides a kind of resistance to sharp comer test device of rope and its test method, the test device include: pedestal, the first fixed frame, the second fixed frame, stationary fixture and drive shaft.Wherein, electric-controlled switch and scram button are provided on pedestal.There is the first sliding rail, the first fixed frame is fixedly connected with the base, and pulley is provided on the first sliding rail, and the first sliding rail is used to adjust the height for the rope being fixed on pulley on first fixed frame.There is the second sliding rail, the second fixed frame is fixed on pedestal, and connection is fixed by the connecting rod between the second sliding rail and sharp block, and the second sliding rail is used to limit the moving direction of sharp block on second fixed frame.Stationary fixture is set on pedestal, for fixing rope.Drive shaft is contacted with sharp block, for driving sharp block mobile.The resistance to sharp comer test device of rope provided by the invention and its test method can be more accurate the resistance to sharp comer degree of test rope, and easy to operate, high degree of automation.
Description
Technical field
The present invention relates to rope detection technique field more particularly to the resistance to sharp comer test of rope, specially a kind of rope are resistance to
Sharp comer test device and its test method.
Background technique
Currently, rope class products application is very extensive, especially in exploration, rescue and military field, different applies ring
Border can quality requirement to rope it is different, for common rope class product, concerned by people is that its breaking strength and fracture are stretched
The mechanical performance index such as long rate.And rope is in use, it will usually touch sharp object, sharp object is for rope
For rope injury be it is huge, especially explore and rescue scene when, the robustness of fibrecord determine rescue and
The safety guarantee grade of exploration.
Only have Union Internationale des Associations de l'Alpinisme to propose the detection concept of the resistance to sharp comer performance in relation to dynamic ropes in the world at present,
And there is the detecting instrument of the resistance to sharp comer of corresponding rope, but test method and equipment of Union Internationale des Associations de l'Alpinisme are only for power
Rope, the resistance to sharp comer performance of rope is characterized by testing, the scope of application is extremely limited.The test of domestic fibrecord basic performance
Instrument system is established not yet, does not form the test method of resistance to sharp comer performance, more without corresponding detecting instrument equipment, and
And not enough due to domestic rope processing fining, enough consciousness is not established to the resistance to sharp comer performance of rope.But with
Rope type, the diversification of function and application range expand, and according to the complexity of application environment, the requirement to rope is not only
It is confined to the basic indexs such as ultimate strength again, more the performances such as emphasis fibrecord rub resistance, resistance to sharp comer.
Therefore those skilled in the art need one kind and can realize to accurately measure, the rope of high degree of automation easy to operate
The resistance to sharp comer test device of rope.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of resistance to sharp comer test device of rope and its surveys
Method for testing.The test device structure is simple, easy to operate, and testing efficiency is high, and test result is accurate and reliable.
The present invention provides a kind of resistance to sharp comer test device of rope, the test device include: be provided with electric-controlled switch with
And the pedestal of scram button；The first fixed frame with the first sliding rail, is fixedly connected with the base, and sets on first sliding rail
It is equipped with pulley, first sliding rail is used to adjust the height for the rope being fixed on the pulley；Second with the second sliding rail
Fixed frame is fixed on the pedestal, is fixedly connected between second sliding rail and sharp block by multiple connecting rods, and described
Two sliding rails are used to limit the moving direction of the sharp block；Stationary fixture is set on the pedestal, for fixing the rope
Rope；And drive shaft, it is contacted with the sharp block, for driving the sharp block mobile.
In a specific embodiment of the invention, the device further include: tension sensor is set on the stationary fixture,
It is connect with the rope, the stress for detecting the rope changes；Processor is connect, for remembering with the tension sensor
Record handles the detection data of the tension sensor；And display, it is connected to the processor, for showing measurement data.
In a specific embodiment of the invention, the section of the drive shaft is ellipse.
As one embodiment of the present invention, the drive shaft is set to the lower section of the sharp block, the connecting rod
The two sides of the sharp block are individually fixed in, and multiple connecting rods are connect with second sliding rail, second sliding rail is used
In moving up and down for the realization sharp block.
As another embodiment of the invention, the drive shaft is set to the side of the sharp block, the point
Sharp piece of the other side is provided with spring, and one end of the spring is fixed on second fixed frame, and the connecting rod is fixed on
The top of the sharp block, and the connecting rod is connect with second sliding rail, second sliding rail is for realizing described sharp
The transverse shifting of block.
In a specific embodiment of the invention, first sliding rail has the first locking system, for described in locking first
Sliding rail.
In a specific embodiment of the invention, there is the second locking system on the pulley, for pulley described in locking.
In a specific embodiment of the invention, the device further include: stepper motor is fixedly connected with the drive shaft, is used
In the driving drive shaft turns.
The resistance to sharp comer test method of a kind of rope provided by the invention, the test method include: installation rope to be measured；Adjustment
Position height of the pulley on the first sliding rail, then locks the first sliding rail；Rotating pulley gives rope one default pulling force, then locks
Tight pulley；Electric-controlled switch is opened, starting stepper motor is tested；And tension sensor records the drawing that rope is subject in real time
Pulling force data is passed to processor and integrated by power.
In a specific embodiment of the invention, the step of installing rope to be measured, specifically include: rope one end to be measured is fixed on
In tension sensor, around after sharp block, other end is fixed on pulley.
According to above-mentioned specific embodiment it is found that a kind of resistance to sharp comer test device of rope provided by the invention and its test
Method has the advantage that the test device structure is simple, easy to operate, and high degree of automation, saves a large amount of manpower.
In addition, device measurement is precisely, and can to test the rope in the case of different angle and different dynamics resistance to for the test device
Sharp comer degree, measurement range is more abundant, and data are more comprehensive.
It is to be understood that above-mentioned general description and following specific embodiments are merely illustrative and illustrative, not
The range of the invention to be advocated can be limited.
Detailed description of the invention
Following attached drawing is part of specification of the invention, depicts example embodiments of the present invention, appended attached
Figure is used to illustrate the principle of the present invention together with the description of specification.
Fig. 1 is a kind of structure chart of the resistance to sharp comer test device of rope provided by the invention.
Fig. 2 is that a kind of sharp block of resistance to sharp comer test device of rope provided by the invention drives the structure of embodiment one
Figure.
Fig. 3 is that a kind of sharp block of resistance to sharp comer test device of rope provided by the invention drives the structure of embodiment two
Figure.
Fig. 4 is that a kind of sharp block of resistance to sharp comer test device of rope provided by the invention drives the structure of embodiment three
Figure.
Fig. 5 is a kind of circuit connection diagram of the resistance to sharp comer test device of rope provided by the invention.
Fig. 6 is a kind of flow chart of the resistance to sharp comer test method embodiment one of rope provided by the invention.
Fig. 7 is a kind of flow chart of the resistance to sharp comer test method embodiment two of rope provided by the invention.
Description of symbols:
1- pedestal, the first fixed frame of 2-, the second fixed frame of 3-, the first sliding rail of 4a-, the second sliding rail of 4b-, 5- pulley, 6- point
Sharp piece, 7- rope, 8- stationary fixture, 9- drive shaft, 10- tension sensor, 11- processor, 12- display, 13- connecting rod,
14- spring, the first locking system of 15a-, the second locking system of 15b-, 16- stepper motor, a- electric-controlled switch, b- scram button.
Specific embodiment
The existing various exemplary embodiment that the present invention will be described in detail, the detailed description are not considered as to limit of the invention
System, and it is understood as the more detailed description to certain aspects of the invention, characteristic and embodiment.
Without departing substantially from the scope or spirit of the invention, the specific embodiment of description of the invention can be done more
Kind improvements and changes, this will be apparent to those skilled in the art.Other realities obtained by specification of the invention
Applying mode for technical personnel is apparent obtain.Present specification and embodiment are merely exemplary.
It is as shown in Figure 1 a kind of structure chart of the resistance to sharp comer test device of rope provided by the invention, this is shown in the drawings
In embodiment, which includes: pedestal 1, the first fixed frame 2, the second fixed frame 3, stationary fixture 8 and drive shaft 9.Its
In, electric-controlled switch a and scram button b is provided on pedestal 1.In addition, pedestal 1 is having a size of long 1000mm~1200mm, width
800mm~1000mm, high 700mm~1300mm.
There is the first sliding rail 4a on first fixed frame 2, the first fixed frame 2 is fixedly connected with pedestal 1, and on the first sliding rail 4a
It is provided with pulley 5, the first sliding rail 4a is used to adjust the height for the rope 7 being fixed on pulley 5.The direction of first sliding rail 4a is perpendicular
Histogram to, the pulley 5 being set on the first sliding rail 4a can move up and down because one end of rope 7 is fixed on pulley 5, institute
Moving up and down adjusting height with pulley 5 can make the angle of rope 7 change.Second fixed frame 3 is fixed on pedestal 1.Such as
Shown in Fig. 2, there is the second sliding rail 4b on the second fixed frame 3, connects between the second sliding rail 4b and sharp block 6 by the way that connecting rod 13 is fixed
It connects, the second sliding rail 4b is used to limit the moving direction of sharp block 6, and the sharp block 6 made moves back and forth on fixed direction.
Stationary fixture 8 is set on pedestal 1, and stationary fixture is for fixing rope 7.One end of rope 7 is fixed on pedestal 1.Driving
Axis 9 is contacted with sharp block 6, and drive shaft 9 makes sharp block 6 carry out sharp comer destruction to rope 7 for driving sharp block 6 mobile.Separately
Outside, the sharp comer angular range of sharp block 6 is 30 °~120 ° in the present embodiment, and sharp corner edge width is 0.5mm~3mm.
In the specific embodiment of the present embodiment, the test device further include: tension sensor 10, processor 11 and display
Device 12.Wherein, tension sensor 10 is set on stationary fixture 8, and tension sensor 10 is connect with rope 7, tension sensor 10
Stress for detecting rope 7 changes.Processor 11 and 10 circuit connection of tension sensor, processor 11 are drawn for recording processing
The detection data of force snesor 10 carries out processing to data and summarizes.Display 12 is connect with processor 11, and display 12 is for showing
Show measurement data, allow user it is more intuitive observe rope 7 stress variation and resistance to sharp comer degree.Such as Fig. 5
Shown, tension sensor 10 collects the stress numerical value of rope 7, pulling force numerical value is then passed to processor 11, processor 11 is right
Pulling force numerical value carries out aggregation process, and numerical value figure is presented on display 12, can be used that family is more intuitive to see rope 7
Stress condition and resistance to sharp comer degree.
In a specific embodiment of the invention, the first sliding rail 4a has the first locking system 15a, the first locking system 15a
For locking the first sliding rail 4a, the pulley 5 being located on the first sliding rail 4a is made to be fixed on certain position of the first sliding rail 4a, pulley
It is fixed with one end of rope 7 on 5, changes position of the pulley 5 on the first sliding rail 4a, and then changes between rope 7 and sharp block 6
Angle, the stress and resistance to sharp comer situation under different angle can be tested.In addition, having the second locking system on pulley 5
15b, the second locking system 15b are used for locking pulley 5, and the pulley 5 made no longer rotates.Pulley 5 is rotated, makes rope 7 by one
Pulling force, according to the testing result of tension sensor 10, when the power reaches preset value, using the second locking system 15b by pulley 5
It locks, no longer rotates it, the power for keeping rope 7 constant by one.It can thus restore to the greatest extent in testing
The stress condition of rope 7 in actual use.In the present embodiment, pulley 5 is F=3.38D to the force value that rope applies2, wherein F
To apply force value, unit N；D is rope diameter, unit mm.
In the embodiment of the present invention, which further includes stepper motor 16, and stepper motor 16 is fixedly connected with drive shaft 9,
For driving drive shaft 9 to rotate.
In a specific embodiment of the invention, the width of the first sliding rail 4a and the second sliding rail 4b are 30mm~100mm, length
For 500mm~1500mm.
In Fig. 2, the section of drive shaft 9 is ellipse, and in this way during drive shaft 9 rotates, drive shaft 9 can be pushed away
The dynamic object for being close to axis surface.In the embodiment, drive shaft 9 is set to the lower section of sharp block 6, and multiple connecting rods 13 are solid respectively
Due to the two sides of sharp block 6, and the other end of connecting rod 13 is connect with the second sliding rail 4b on the second fixed frame 3, and second is sliding
Rail 4b moves up and down for realizing sharp block 6.Stepper motor 16 drives drive shaft 9 to rotate, and drive shaft 9 is under sharp block 6
Side pushes sharp block 6 mobile, because the moving direction of sharp block 6 is limited by the second sliding rail 4b, is merely able to do up and down reciprocatingly
Movement.For sharp block 6 during pumping, sharp block 6 has the thrust of a curved variation to rope 7, in this way
The stress condition that user carries out rope 7 when prompt drop, and destruction of the rope 7 by sharp comer when carrying out prompt drop can be imitated
Situation.
It is illustrated in figure 3 another embodiment of the invention, in the embodiment, the section of drive shaft 9 is ellipse,
In this way during drive shaft 9 rotates, drive shaft 9 can push the object for being close to axis surface.Drive shaft 9 is set to point
Sharp piece 6 of side, the other side of sharp block 6 are provided with spring 14, and one end of spring 14 is fixed on the second fixed frame 3, and one
Or multiple connecting rods 13 are fixed on the top of sharp block 6, and the other end of connecting rod 13 is connect with the second sliding rail 4b, second is sliding
Rail 4b for realizing sharp block 6 transverse shifting.The embodiment has imitated rope 7 by constant force, sharp comer
To the destruction situation in 7 transverse direction of rope, the pulling force for keeping rope 7 by an approximately constant is needed in this case, this drawing
Power is provided by pulley 5, and the size of pulling force can also be changed by rotation pulley 5.
In addition, in order to avoid driving rope 7 mobile when sharp 6 transverse shifting of block needing that rope is arranged on the second fixed frame 3
Rope fixed link, one end that rope fixed link is contacted with rope 7 are U-lag, rope 7 can be set in U-lag, prevent rope
7 transverse shiftings.Movement under force is carried out to rope 7 in order to avoid rope fixed link influences sharp block 6, rope fixed link should be set to
Sharp block 6 and the discontiguous section of rope 7 on rope 7.
It is illustrated in figure 4 another embodiment of the invention, in the embodiment, one or more connecting rods 13 are fixed
In the top of sharp block 6, and the other end of connecting rod 13 is connect with the second sliding rail 4b, and the lower part of sharp block 6 is provided with bar shaped
Tooth is fixed on the transmission shaft of stepper motor with the gear of bar shaped tooth engagement, provides power for moving left and right for sharp block 6.
The embodiment has imitated rope 7 by constant force, and sharp comer is to the destruction situation in 7 transverse direction of rope, this feelings
The pulling force for keeping rope 7 by an approximately constant is needed under condition, this pulling force is provided by pulley 5, and the size of pulling force can also
To be changed by rotation pulley 5.
In addition, in order to avoid driving rope 7 mobile when sharp 6 transverse shifting of block needing that rope is arranged on the second fixed frame 3
Rope fixed link, one end that rope fixed link is contacted with rope 7 are U-lag, rope 7 can be set in U-lag, prevent rope
7 transverse shiftings.Movement under force is carried out to rope 7 in order to avoid rope fixed link influences sharp block 6, rope fixed link should be set to
Sharp block 6 and the discontiguous section of rope 7 on rope 7.
Fig. 6 is a kind of flow chart of the resistance to sharp comer test method embodiment one of rope provided by the invention.As shown in fig. 6,
It needs for rope to be measured to be fixed in test device before being tested, and according to test request, one is applied in advance to rope
If pulling force, do the scene that the reduction in big Chengdu really uses.Test data is passed to place by tension sensor in test process
It manages device and carries out aggregation process, then test result can be presented over the display.
In the specific embodiment shown in the drawings, which includes:
Step S1: rope to be measured is installed.
Step S2: then position height of the adjustment pulley on the first sliding rail locks the first sliding rail.Adjust the height of pulley
It is to test stress under different angle and resistance to sharp to adjust the angle between the rope being fixed on pulley and sharp block
Angular travel degree.
Step S3: rotating pulley gives rope one default pulling force, then locks pulley.Rotating pulley makes rope by one
A pulling force, according to the testing result of tension sensor, when the power reaches preset value, using the second locking system by pulley lock
Firmly, no longer rotate it, the power for keeping rope constant by one.Rope can thus be restored to the greatest extent in testing
Stress condition in actual use.
Step S4: opening electric-controlled switch, and starting stepper motor is tested.Start stepper motor, then drives drive shaft
Rotation, drive shaft drive sharp block, start to be tested.
Step S5: tension sensor records the pulling force that rope is subject in real time, and it is whole that pulling force data is passed to processor progress
It closes.The pulling force data that tension sensor will test passes to processor, and processor carries out aggregation process to pulling force data, then
Data result is presented over the display.
In a specific embodiment of the invention, before step S1, a kind of resistance to sharp comer test method of rope further include:
Rope is placed 84 hours under conditions of 20 ± 5 DEG C of temperature, relative humidity 60 ± 5%.
In a specific embodiment of the invention, before step S1, the temperature that need to adjust test environment is 23 ± 5 DEG C.
Fig. 7 is a kind of flow chart of the resistance to sharp comer test method embodiment two of rope provided by the invention.Shown in the attached drawing
Embodiment in, step S1 is specifically included:
Rope one end to be measured is fixed in tension sensor, and around after sharp block, other end is fixed on pulley.It is to be measured
To be fixed in tension sensor be in order to detect the stress condition of rope during the test other the one of rope for rope one end
It is the size for changing the default pulling force that rope is subject to before testing for convenience that end, which is fixed on pulley,.
The foregoing is merely the schematical specific embodiments of the present invention, before not departing from conceptions and principles of the invention
It puts, the equivalent changes and modifications that any those skilled in the art is made should belong to the scope of protection of the invention.
Claims (10)
1. a kind of resistance to sharp comer test device of rope, which is characterized in that the test device includes:
It is provided with the pedestal (1) of electric-controlled switch (a) and scram button (b)；
The first fixed frame (2) with the first sliding rail (4a), is fixedly connected with the pedestal (1), on first sliding rail (4a)
It is provided with pulley (5), first sliding rail (4a) is used to adjust the height for the rope (7) being fixed on the pulley (5)；
The second fixed frame (3) with the second sliding rail (4b), is fixed on the pedestal (1), second sliding rail (4b) and point
It is fixedly connected between sharp piece (6) by multiple connecting rods (13), second sliding rail (4b) is for limiting the sharp block (6)
Moving direction；
Stationary fixture (8) is set on the pedestal (1), for fixing the rope (7)；And
Drive shaft (9) is contacted with the sharp block (6), for driving the sharp block (6) mobile.
2. the resistance to sharp comer test device of rope according to claim 1, which is characterized in that the device further include:
Tension sensor (10) is set on the stationary fixture (8), is connect with the rope (7), for detecting the rope
(7) stress variation；
Processor (11) is connect with the tension sensor (10), for recording the detection for handling the tension sensor (10)
Data；And
Display (12) is connect, for showing measurement data with the processor (11).
3. the resistance to sharp comer test device of rope according to claim 1, which is characterized in that the section of the drive shaft (9)
For ellipse.
4. the resistance to sharp comer test device of rope according to claim 3, which is characterized in that the drive shaft (9) is set to
The lower section of the sharp block (6), multiple connecting rods (13) are individually fixed in the two sides of the sharp block (6), and the company
Extension bar (13) is connect with second sliding rail (4b), and second sliding rail (4b) on the sharp block (6) for realizing moving down
It is dynamic.
5. the resistance to sharp comer test device of rope according to claim 3, which is characterized in that the drive shaft (9) is set to
The other side of the side of the sharp block (6), the sharp block (6) is provided with spring (14), and one end of the spring (14) is solid
Due on second fixed frame (3), the connecting rod (13) is fixed on the top of the sharp block (6), and the connecting rod
(13) connect with second sliding rail (4b), second sliding rail (4b) for realizing the sharp block (6) transverse shifting.
6. the resistance to sharp comer test device of rope according to claim 1, which is characterized in that first sliding rail (4a) has
First locking system (15a), for the first sliding rail (4a) described in locking.
7. the resistance to sharp comer test device of rope according to claim 1, which is characterized in that have the on the pulley (5)
Two locking systems (15b), for pulley (5) described in locking.
8. the resistance to sharp comer test device of rope according to claim 1, which is characterized in that the device further include: stepping electricity
Machine (16) is fixedly connected with the drive shaft (9), for driving the drive shaft (9) to rotate.
9. a kind of resistance to sharp comer test method of rope, which is characterized in that the test method includes:
Rope to be measured is installed；
Position height of the pulley on the first sliding rail is adjusted, the first sliding rail is then locked；
Rotating pulley gives rope one default pulling force, then locks pulley；
Electric-controlled switch is opened, starting stepper motor is tested；And
Tension sensor records the pulling force that rope is subject in real time, and pulling force data is passed to processor and is integrated.
10. the resistance to sharp comer test method of rope according to claim 9, which is characterized in that the step of installing rope to be measured,
It specifically includes:
Rope one end to be measured is fixed in tension sensor, and around after sharp block, other end is fixed on pulley.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910283193.9A CN110044696B (en) | 2019-04-10 | 2019-04-10 | Rope sharp angle resistance testing device and testing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910283193.9A CN110044696B (en) | 2019-04-10 | 2019-04-10 | Rope sharp angle resistance testing device and testing method thereof |
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| CN110044696A true CN110044696A (en) | 2019-07-23 |
| CN110044696B CN110044696B (en) | 2024-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530720A (en) * | 2019-09-25 | 2019-12-03 | 鲁普耐特集团有限公司 | A kind of quiet device for testing tensile force of high altitude operation safety rope and its test method |
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| CN110044696B (en) | 2024-05-31 |
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