CN104800989B - Fall protection equipment and fall arrest protection system - Google Patents
Fall protection equipment and fall arrest protection system Download PDFInfo
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- CN104800989B CN104800989B CN201510267753.3A CN201510267753A CN104800989B CN 104800989 B CN104800989 B CN 104800989B CN 201510267753 A CN201510267753 A CN 201510267753A CN 104800989 B CN104800989 B CN 104800989B
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- 238000010586 diagram Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 206010057071 Rectal tenesmus Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 208000012271 tenesmus Diseases 0.000 description 1
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Abstract
The invention discloses a kind of fall protection equipment and fall arrest protection system.The fall protection equipment includes：Wire rope handling part, with first end and the second end, is passed through suitable for rope；Extension component, with first end and the second end, the first end of the extension component is fixedly attached to the second end of the wire rope handling part；Connection member, is connected to the extension component, suitable for being connected to protection object by safety belt.When the connection member is by with pulling force from opposite direction component of the first end of the wire rope handling part to the second end, the pulling force applies torque to the fall protection equipment so that the fall protection equipment rotates.So, when protecting object to fall, above-mentioned pulling force is produced to connection member, the pulling force applies torque to the fall protection equipment so that the fall protection equipment rotates.So as to make wire rope handling part produce frictional resistance to the rope through the end of wire rope handling part second, prevent protection object from directly falling.
Description
Technical field
The present invention relates to falling proof device field, more particularly to fall protection equipment and fall arrest protection system.
Background technology
So-called high-rise working, refers to the operation that eminence of the people on the basis of certain position is carried out.National Specification：It is " all
Operation, referred to as high-rise working are carried out in more than height of fall reference plane 2m (the containing 2m) eminences for being possible to fall." according to this
Regulation, the scope that high-rise working is related in construction industry is quite extensive.In building during operation, if in more than 2m shelf
It is upper to be operated, as high-rise working.
Overhead Transmission Line Construction with maintenance, staff's operation of ascending a height is very frequent.Shaft tower is for example climbed, one
In item work, operating personnel may need to carry out shaft tower multiple or many people's climbings.And in real work, operating personnel is upper
All it is unshielded during lower shaft tower, in the event of fortuitous events such as pin nail loose or dislocation, pin cunnings, can directly results in and fall
Accident.Next to that climbing soft ladder busywork, due to the unstability of rope ladder, the accident for being also easily caused very much personnel is dropped.
Tradition prevents the method that staff drops from being that one end of a rope is fixed on the safety belt of staff,
The other end bypasses the pulley or wire being fixed on shaft tower, is manually held with hand by lower work personnel.
However, it is contemplated that person's development time, impulsive force during person tenesmus suddenly can bear much larger than the arm strength of people
The factor such as scope, easily there is lower work staff response not in time or the phenomenon such as rubber sleeve, exists in traditional fall arrest method
Very big potential safety hazard.
The content of the invention
The technical problems to be solved by the invention are to solve the problem of traditional fall arrest method has very big potential safety hazard, are carried
For a kind of fall protection equipment and a kind of fall arrest protection system.
According to an aspect of the invention, there is provided a kind of fall protection equipment.
A kind of fall protection equipment, including：
Wire rope handling part, with first end and the second end, is passed through suitable for rope；
Extension component, with first end and the second end, the first end of the extension component is fixedly attached to the wire rope handling portion
Second end of part；
Connection member, is connected to the extension component, suitable for being connected to protection object by safety belt,
When the connection member is by with point in opposite direction with the first end from the wire rope handling part to the second end
During the pulling force of power, the pulling force applies torque to the fall protection equipment so that the fall protection equipment rotates.
So, when protecting object to fall, above-mentioned pulling force is produced to connection member, the pulling force is to the fall protection equipment
Apply torque so that the fall protection equipment rotates.So as to make wire rope handling part to the rope production through the end of wire rope handling part second
Raw frictional resistance, prevents protection object from directly falling.
Preferably, the wire rope handling part is hollow wire rope handling pipe.
Preferably, the extension component is semi-hollow extension tube, and the semi-hollow extension tube is the hollow wire rope handling pipe
The extension of axis direction of the half of cross section along the hollow wire rope handling pipe.
Preferably, the semi-hollow extension tube is welded to the hollow wire rope handling pipe.
Preferably, the semi-hollow extension tube is integrally formed with the hollow wire rope handling pipe.
So, design is integrally formed by semi-hollow extension tube and hollow wire rope handling pipe, makes the fall protection equipment more
Firmly.
Preferably, the connection member is arranged on the position close to the second end of the extension component on the extension component
Place.
So, connection member is arranged on extension component at the position at the second end of extension component, works as connection member
During by above-mentioned pulling force, the pulling force can produce bigger torque to fall protection equipment, so as to increase fall arrest protection
The anglec of rotation of device, further increases frictional resistance of the wire rope handling part to the rope generation through the end of wire rope handling part second.
Preferably, the connection member is arranged on the extension component one opposite with the axis of the hollow wire rope handling pipe
Side.
So, when connection member is by above-mentioned pulling force effect, the connection member drives extension component rotation, makes hollow wear
Pipe of restricting produces frictional resistance to the rope through the hollow end of wire rope handling pipe second.
Preferably, the connection member is connection ring, is welded to the extension component or through on the extension component
Perforation.
Preferably, the hollow wire rope handling pipe is aluminum alloy hollow wire rope handling pipe.
Preferably, the extension component is aluminium alloy extension component.
Preferably, the connection member is aluminium alloy connection member.
So, make the fall protection equipment that there is enough mechanical strengths, pulling force in larger scope can be born, entered
One step strengthens the dynamics for preventing from protecting object to fall.
Preferably, the length of the hollow wire rope handling pipe is between 6.3 centimetres to 6.5 centimetres；
The length of the semi-hollow extension tube is between 6.3 centimetres to 6.5 centimetres.
So, the length of hollow wire rope handling pipe and semi-hollow extension tube is separately positioned in above-mentioned length range.By above-mentioned
Design, when the fall protection equipment is by above-mentioned pulling force, can be produced sufficiently large to the rope through hollow wire rope handling pipe
Frictional resistance, makes protection object stop falling or slowly fall with the acceleration much smaller than acceleration of gravity.So as to improve and protect
Protect the safety coefficient of object.
According to another aspect of the present invention, a kind of fall arrest protection system is additionally provided.
A kind of fall arrest protects system, for preventing protection object from falling from high altitude, including：
Fixed pulley, is fixed on eminence；
Above-mentioned fall protection equipment, its connection member is connected to the protection object；
Rope, one end of the rope is connected to the protection object, and the other end sequentially bypasses the fixed pulley, from described
Second end of the wire rope handling part of fall protection equipment enters the wire rope handling part, and is passed from the first end of wire rope handling part,
When the protection object falls, the protection object is by the safety belt to the fall protection equipment
Connection member applies pulling force, so that the fall protection equipment rotates, rope described in the two port of the wire rope handling part
Frictional resistance is produced, the protection object is stopped falling or is fallen with the first acceleration, wherein, first acceleration is less than
Acceleration of gravity.
Fall protection equipment and fall arrest the protection system of the present invention, by simply designing and fall arrest principle, energy
Enough prevent protection object from directly falling, so as to protect its personal safety or property safety.
Brief description of the drawings
By the way that disclosure illustrative embodiments are described in more detail with reference to accompanying drawing, the disclosure above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein, in disclosure illustrative embodiments, identical reference number
Typically represent same parts.
Fig. 1 shows the schematic diagram of fall protection equipment according to an embodiment of the invention；
Fig. 2 shows the fall protection equipment rotation schematic diagram of embodiment illustrated in fig. 1；
Fig. 3 shows the front view of fall protection equipment according to another embodiment of the present invention；
Fig. 4 shows the schematic diagram of the fall protection equipment of embodiment illustrated in fig. 3；
Fig. 5 shows the sectional view of the fall protection equipment of embodiment illustrated in fig. 3；
Fig. 6 shows that fall arrest according to an embodiment of the invention protects the schematic diagram of system；
Fig. 7 shows the fall arrest schematic diagram that system is protected according to the fall arrest of embodiment illustrated in fig. 6.
Embodiment
The preferred embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure without the embodiment party that should be illustrated here
Formula is limited.On the contrary, these embodiments are provided so that the disclosure is more thorough and complete, and can be by the disclosure
Scope intactly conveys to those skilled in the art.
It is the schematic diagram of the fall protection equipment of one embodiment of the invention shown in Fig. 1.
It is the fall protection equipment rotation schematic diagram of embodiment illustrated in fig. 1 shown in Fig. 2.
With reference to Fig. 1, a kind of fall protection equipment 100, including wire rope handling part 120, extension component 140 and connection member
160。
Wherein, wire rope handling part 120 has first end A and the second end B, is passed through suitable for rope.Extension component 140 has first
C and the second end D, the first end C of extension component 140 is held to be fixedly attached to the second end B of wire rope handling part 120.Connection member 160 connects
Extension component 140 is connected to, suitable for being connected to protection object 400 by safety belt (referring to Fig. 6, Fig. 7).
With reference to Fig. 2, when connection member 160 by with the first end A from wire rope handling part 120 to the second end B direction
(component F1 causes fall protection equipment 100 to have along the second end B to first from wire rope handling part 120 to opposite component F1
Section A direction motion tendency) pulling force F when, pulling force F to the fall protection equipment 100 apply torque so that this is anti-fall
Fall protection device 100 to rotate.
So, when protecting object 400 to fall, above-mentioned pulling force F is produced to connection member 160, pulling force F is to the fall arrest
Protection device 100 applies torque so that the fall protection equipment 100 rotates.So as to make 120 pairs of wire rope handling part pass through wire rope handling
The end B of part 120 second rope produces frictional resistance, so as to prevent protection object 400 from directly falling, from it is unprotected its it is personal or
Person's property safety.
Staff ascend a height operation when, be all often without any safeguard measure, in the event of pin nail loose or dislocation, pin
The fortuitous event such as sliding or rope ladder is unstable, can directly result in falling accident.By using the fall protection equipment 100, energy
It is enough effectively to prevent staff from directly falling, it is slowly fallen, can also reflect to the staff of following pulling rope
Time, it is to avoid lower work staff response not in time or the phenomenon such as rubber sleeve, ensures the personal safety of the staff for operation of ascending a height.
Meanwhile, protection object 400 can also be object.For example, it is also possible to which connection member 160 is connected into operation of ascending a height
On the object (such as kit bag) that staff carries, the caused damage to property that directly falls of the object is prevented.
The fall protection equipment 100 that the present invention is provided can effectively protect staff or other protection objects
Safety, and design simple, cost is relatively low, is easy to promote.
It is the front view of the fall protection equipment according to another embodiment of the present invention shown in Fig. 3.
It is the schematic diagram of the fall protection equipment of embodiment illustrated in fig. 3 shown in Fig. 4.
It is the sectional view of the fall protection equipment of embodiment illustrated in fig. 3 shown in Fig. 5.
With reference to Fig. 3, above-mentioned wire rope handling part 120 can be hollow wire rope handling pipe.In other examples, hollow worn when above-mentioned
When length of tube of restricting is smaller, above-mentioned wire rope handling part 120 can also be hollow wire rope handling ring.
When above-mentioned wire rope handling part 120 is hollow wire rope handling ring, hollow wire rope handling ring length is sufficiently small, so as to pass through hollow wire rope handling
Torque that the upward pulling force of the rope of ring is produced to the fall protection equipment 100 is relative to diminish, so as to act on connection member
The relative change of torque that 160 pulling force F is produced to the fall protection equipment 100 is big, further increases 120 pairs of wire rope handling part and wears
The frictional resistance that the end B of wire rope handling part 120 second rope is produced is crossed, prevents protection object 400 from directly falling.
With reference to Fig. 4, above-mentioned extension component 140 can be semi-hollow extension tube, and the semi-hollow extension tube is above-mentioned hollow wears
The extension of axis direction of the half of the cross section of rope pipe 120 along the hollow wire rope handling pipe, in other words, the semi-hollow pipe extension tube
Cross section can be the half of above-mentioned hollow wire rope handling pipe 120.
In other embodiments, the cross section of above-mentioned extension component 140 can also be hollow to be worn less or greater than above-mentioned
The half of the cross section of rope pipe 120.Above-mentioned extension component 140 be semi-hollow extension tube when, can reduce because extension component 140 with
Connection area is relatively small between wire rope handling part 120 causes what is be easily broken off between easy extension component 140 and wire rope handling part 120
Problem, can also save material, reduce production cost.
Above-mentioned semi-hollow extension tube can be soldered to above-mentioned hollow wire rope handling pipe, or can also be with above-mentioned hollow wire rope handling pipe one
It is body formed.When the semi-hollow extension tube is integrally formed with hollow wire rope handling pipe, semi-hollow extension tube and hollow wire rope handling pipe can be increased
Between connection dynamics, prevent from, because the pulling force for acting on connection member 160 is excessive, causing semi-hollow extension tube and hollow wire rope handling pipe
Between situation about being easily broken off occur.
In other embodiments, above-mentioned connection member 160 can also be integrally formed with above-mentioned extension component 140.Or, ginseng
Fig. 5 is examined, above-mentioned wire rope handling part 120, extension component 140 can be integrally formed with connection member 160.So, this is increased anti-fall
Fall the overall mechanical strength of protection device 100, make the fall protection equipment 100 more firmly, can bear a greater degree of
Pulling force, improves protection.
Preferably, above-mentioned connection member 160 is arranged on the position of the second end D of close extension component 140 on extension component 140
Put place.
So, when 140 under tension of connection member, it can make pulling force F that there is the relatively large arm of force, so as to
Bigger torque is produced to fall protection equipment 100, the anglec of rotation of the fall protection equipment 100 is increased, further added
The frictional resistance that 120 pairs of ropes through the end B of wire rope handling part 120 second of big wire rope handling part are produced.
Preferably, above-mentioned connection member 160 is arranged on extension component 140 one opposite with the axis of hollow wire rope handling pipe
Side.
So, when connection member 160 is acted on by above-mentioned pulling force F, the connection member 160 drives extension component 140 to revolve
Turn, hollow wire rope handling pipe is produced frictional resistance to the rope through hollow the second end of wire rope handling pipe B.
Above-mentioned connection member 160 can be connection ring, and the connection ring can be soldered to above-mentioned extension component 140 or with prolonging
Extending portion part 140 is integrally formed and (refers to Fig. 5).
In other examples, the connection ring can also extend through the perforation on part 140.
Preferably, above-mentioned hollow wire rope handling pipe can be aluminum alloy hollow wire rope handling pipe, and extension component 140 can prolong for aluminium alloy
Extending portion part, connection member 160 can be aluminium alloy connection member.
So, the fall protection equipment 100 has enough mechanical strengths, can bear pulling force in larger scope,
Further strengthen the dynamics for preventing from protecting object to fall.
Preferably, the length of above-mentioned hollow wire rope handling pipe is between 6.3 centimetres to 6.5 centimetres, the length of semi-hollow extension tube
Between 6.3 centimetres to 6.5 centimetres.
The length of hollow wire rope handling pipe and semi-hollow extension tube is separately positioned in above-mentioned length range, by above-mentioned design,
When the fall protection equipment 100 is by above-mentioned pulling force F, sufficiently large rub can be produced to the rope through hollow wire rope handling pipe
Resistance is wiped, protection object 400 is stopped falling or is slowly fallen with the acceleration much smaller than acceleration of gravity, protection pair is improved
As 400 safety coefficient.
Also, by the above-mentioned restriction to hollow wire rope handling pipe and the length of semi-hollow extension tube, when protection object 400 falls
When, semi-hollow extension tube forms right angle or obtuse angle with the rope at the second end B ends of hollow wire rope handling pipe.In such manner, it is possible to increase
Hollow wire rope handling pipe makes protection object 400 stop falling the frictional force of rope, or with the acceleration much smaller than acceleration of gravity
Slow whereabouts, the danger coefficient of reduction protection object 400.
It is the schematic diagram that system is protected according to the fall arrest of one embodiment of the invention shown in Fig. 6 shows.
It is the fall arrest schematic diagram that system is protected according to the fall arrest of embodiment illustrated in fig. 6 shown in Fig. 7.
With reference to Fig. 6, a kind of fall arrest protects system 300, for preventing protection object 400 from falling from high altitude, including determines cunning
Wheel 320, above-mentioned fall protection equipment 340 and rope 360.
Wherein, above-mentioned fixed pulley 320 is fixed on eminence.Connection member (figure is not marked) connection of fall protection equipment 340
To protection object 400.One end E of rope 360 is connected to protection object 400, and other end F sequentially bypasses fixed pulley 320, from anti-fall
The the second end B for falling the wire rope handling part (figure is not marked) of protection device 340 enters wire rope handling part, and is worn from the first end A of wire rope handling part
Go out.
When protecting object 400 up or descending, fall protection equipment 340 is mobile in the same direction with protection object 400.
With reference to Fig. 7, when protecting object 400 to fall, protection object 400 is by safety belt 500 to fall protection equipment
340 connection member applies pulling force, so that fall protection equipment 340 rotates.Second end B of wire rope handling part is to rope 360
Frictional resistance is produced, so that protection object 400 is stopped falling or fallen with the first acceleration.Wherein, above-mentioned first acceleration
Less than acceleration of gravity.
So, when protecting object 400 to fall, fall arrest protection system 300 effectively can prevent it from directly falling,
It is slowly fallen or is stopped falling and be capable of the safety of effective guarantee protection object 400.
The F ends of above-mentioned rope 360 are free end, can be hand-held by surface personnel, when protecting object 400 to fall,
Surface personnel further can prevent it from falling by holding handheld terminal.
The length of above-mentioned rope 360 can be more than twice of the height of above-mentioned eminence.So, above-mentioned ground can be ensured
Staff can hold the rope 360 in certain scope of activities.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
The principle, practical application or the improvement to the technology in market of each embodiment are best being explained, or is making the art
Other those of ordinary skill are understood that each embodiment disclosed herein.
Claims (8)
1. a kind of fall protection equipment, it is characterised in that including：
Wire rope handling part, with first end and the second end, is passed through suitable for rope, and the wire rope handling part is hollow wire rope handling pipe；
Extension component, with first end and the second end, the first end of the extension component is fixedly attached to the wire rope handling part
Second end, the extension component is semi-hollow extension tube, and the semi-hollow extension tube is the cross section of the hollow wire rope handling pipe
The extension of axis direction of the half along the hollow wire rope handling pipe；
Connection member, is connected to the extension component, suitable for being connected to protection object by safety belt,
When the connection member by with from opposite direction component of the first end of the wire rope handling part to the second end
During pulling force, the pulling force applies torque to the fall protection equipment so that the fall protection equipment rotates.
2. fall protection equipment according to claim 1, it is characterised in that
The semi-hollow extension tube is welded to the hollow wire rope handling pipe；Or
The semi-hollow extension tube is integrally formed with the hollow wire rope handling pipe.
3. fall protection equipment according to claim 1, it is characterised in that the connection member is arranged on the extension
On part at the position at the second end of the extension component.
4. fall protection equipment according to claim 3, it is characterised in that the connection member is arranged on the extension
The side opposite with the axis of the hollow wire rope handling pipe on part.
5. the fall protection equipment according to any one of Claims 1-4, it is characterised in that the connection member
For connection ring, the extension component is welded to or through the perforation on the extension component.
6. the fall protection equipment according to any one of Claims 1-4, it is characterised in that
The hollow wire rope handling pipe is aluminum alloy hollow wire rope handling pipe；And/or
The extension component is aluminium alloy extension component；And/or
The connection member is aluminium alloy connection member.
7. the fall protection equipment according to any one of Claims 1-4, it is characterised in that
The length of the hollow wire rope handling pipe is between 6.3 centimetres to 6.5 centimetres；
The length of the semi-hollow extension tube is between 6.3 centimetres to 6.5 centimetres.
8. a kind of fall arrest protects system, for preventing protection object from falling from high altitude, it is characterised in that including：
Fixed pulley, is fixed on eminence；
Fall protection equipment according to any one of claim 1 to 7, its connection member is connected to the protection pair
As；
Rope, one end of the rope is connected to the protection object, and the other end sequentially bypasses the fixed pulley, from described anti-fall
The second end for falling the wire rope handling part of protection device enters the wire rope handling part, and is passed from the first end of wire rope handling part,
When the protection object falls, connection of the protection object by the safety belt to the fall protection equipment
Part applies pulling force, so that the fall protection equipment rotates, rope described in the two port of the wire rope handling part is produced
Frictional resistance, makes the protection object stop falling or fall with the first acceleration, wherein, first acceleration is less than gravity
Acceleration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510267753.3A CN104800989B (en) | 2015-05-22 | 2015-05-22 | Fall protection equipment and fall arrest protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510267753.3A CN104800989B (en) | 2015-05-22 | 2015-05-22 | Fall protection equipment and fall arrest protection system |
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| Publication Number | Publication Date |
|---|---|
| CN104800989A CN104800989A (en) | 2015-07-29 |
| CN104800989B true CN104800989B (en) | 2017-09-12 |
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ID=53686454
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510267753.3A Active CN104800989B (en) | 2015-05-22 | 2015-05-22 | Fall protection equipment and fall arrest protection system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4538703A (en) * | 1982-09-30 | 1985-09-03 | Research & Trading Corporation | Climbing aid and safety descent system |
| CN101385895A (en) * | 2008-10-31 | 2009-03-18 | 上海工程技术大学 | Indoor rock-climbing safeguard device |
| CN101766873A (en) * | 2010-01-22 | 2010-07-07 | 北京龙灵科技有限公司 | Automatic braking device for rope driving |
| CN203382465U (en) * | 2013-07-29 | 2014-01-08 | 山东国风风电设备有限公司 | Auxiliary tower climbing special tool for draught fan maintenance |
| CN204225754U (en) * | 2014-11-12 | 2015-03-25 | 东营大明石油工程科技开发有限责任公司 | Power-assisted climbing-up device |
-
2015
- 2015-05-22 CN CN201510267753.3A patent/CN104800989B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4538703A (en) * | 1982-09-30 | 1985-09-03 | Research & Trading Corporation | Climbing aid and safety descent system |
| CN101385895A (en) * | 2008-10-31 | 2009-03-18 | 上海工程技术大学 | Indoor rock-climbing safeguard device |
| CN101766873A (en) * | 2010-01-22 | 2010-07-07 | 北京龙灵科技有限公司 | Automatic braking device for rope driving |
| CN203382465U (en) * | 2013-07-29 | 2014-01-08 | 山东国风风电设备有限公司 | Auxiliary tower climbing special tool for draught fan maintenance |
| CN204225754U (en) * | 2014-11-12 | 2015-03-25 | 东营大明石油工程科技开发有限责任公司 | Power-assisted climbing-up device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104800989A (en) | 2015-07-29 |
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