CN203722132U - Winch running prevention device - Google Patents
Winch running prevention device Download PDFInfo
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- CN203722132U CN203722132U CN201420072865.4U CN201420072865U CN203722132U CN 203722132 U CN203722132 U CN 203722132U CN 201420072865 U CN201420072865 U CN 201420072865U CN 203722132 U CN203722132 U CN 203722132U
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- pulley
- connecting rod
- pull rope
- brake assemblies
- mill
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- 230000002265 prevention Effects 0.000 title abstract 4
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 230000033001 locomotion Effects 0.000 claims abstract description 18
- 230000000712 assembly Effects 0.000 claims description 37
- 238000000429 assembly Methods 0.000 claims description 37
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 abstract 1
- 239000003351 stiffener Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Abstract
The utility model provides a winch running prevention device. The winch running prevention device comprises: a base for supporting; a detection assembly which is located on the base for detecting the moving direction of a winch pulling rope; and a brake assembly which is located on the base and connected with the detection assembly, wherein the action of the brake assembly is triggered by the detection assembly when the detection assembly is used to detect the reverse movement of the winch pulling rope to make the winch pulling rope chucked by the brake assembly. The winch running prevention device of the utility model can be used to automatically detect the moving direction of the winch pulling rope and chuck the pulling rope when the pulling rope is in the reverse movement to prevent the occurrence of the winch running phenomenon so as to avoid various accidents caused by winch running.
Description
Technical field
The utility model relates to rope direction of motion control technology field, and particularly, the utility model is particularly related to a kind of anti-race mill apparatus.
Background technology
Strand mill is one of plant equipment the most frequently used in transmission line construction.It is mainly used in towage, be widely used in each operation of line construction, as: tower erection, put stringing, set up opgw(Optical Fiber Composite Overhead Ground Wire, Optical Fiber composite overhead Ground Wire) optical cable.
Strand is ground at the scene in work progress, and the unexpected situation of appearance is substantially all to run mill, and the implication of running mill is: when utilizing the normal traction of strand mill, due to certain uncontrollable reason, cause the pull rope being wrapped on strand mill to withdraw rapidly in the other direction.If occur, run mill phenomenon, strand mill is ineffective, and pull rope will withdraw rapidly, drives bobbin to move rapidly to strand mill direction, if Field Force is too late to dodge, just Field Force is damaged, even dead.
Probe into and run the reason that mill produces, roughly have following some:
1, when normal traction, pull rope stirs together, runs mill when prizing strand mill pull rope.
2, not right owing to dragging the direction that tail rope personnel drag, tail rope causes running outer the coming off of strand mill and grinds.
3, exchange is while dragging tail rope personnel, coordinates not tacit or to drag the people of mill rope few and cause running and grind.
4, pull rope has breakage to find in time, when through strand mill, disconnects, and also will cause running mill.
It is more that the reason of mill is run in visible generation, and run after mill phenomenon occurs, and endanger very hugely, and Given this, industry is necessary to develop anti-race mill apparatus, to avoid running the generation of grinding phenomenon.
Summary of the invention
The purpose of this utility model is to provide a kind of anti-race mill apparatus, to solve strand mill, the problem of mill may occur to run when applying.
In order to address the above problem, the utility model provides a kind of anti-race mill apparatus, and its technical scheme is as follows:
An anti-race mill apparatus, it comprises: base, for providing support; Detection components, is positioned on described base, for detection of the direction of motion of strand mill pull rope; Brake assemblies, is positioned on described base, is connected with described detection components; The opposite direction of described detection components detection strand mill pull rope triggers described brake assemblies action while moving, and makes described brake assemblies clamping twist mill pull rope.
Preferably, in above-mentioned anti-race mill apparatus, described base is tabular, and the front end of described base is fixed with draw ring.
Preferably, in above-mentioned anti-race mill apparatus, described detection components comprises: pulley mechanism, comprise at least one pulley, and the groove of described pulley is for spacing strand mill pull rope, to detect the direction of motion of strand mill pull rope; Transmission mechanism, is connected with rotating shaft and the described brake assemblies of described pulley, while changing for the strand mill pull rope direction of motion detected at described pulley mechanism, triggers described brake assemblies.
Preferably, in above-mentioned anti-race mill apparatus, described pulley mechanism comprises the first parallel pulley of axis, the second pulley and the 3rd pulley, described the first pulley, the 3rd pulley are positioned at the both sides of described the second pulley, and the height of described the first pulley, the 3rd pulley is different from described the second pulley, so that strand mill pull rope can closely embed in the groove of described the first pulley, the second pulley and the 3rd pulley; The rotating shaft of described the second pulley is connected with described transmission mechanism.
Preferably, in above-mentioned anti-race mill apparatus, described transmission mechanism comprises: ratchet and pawl arrangement, be located at rotating shaft one end of described pulley, the ratchet of described ratchet and pawl arrangement, when strand mill pull rope occurs to move, drives the ratchet of described ratchet and pawl arrangement to rotate in the other direction; Foreign steamer, is fixed on the ratchet outside of described ratchet and pawl arrangement; Linkage, is connected with described foreign steamer, for making the rotation of described foreign steamer drive to described brake assemblies, to trigger described brake assemblies action.
Preferably, in above-mentioned anti-race mill apparatus, described linkage comprises: first connecting rod, and first end is connected with described foreign steamer; Second connecting rod, the second end of first end and described first connecting rod is hinged, and the second end is articulated with on described base; Third connecting rod, middle part is articulated with on described base, and first end is positioned at the first end below of described second connecting rod; When described foreign steamer rotates, drive described second connecting rod to tilt to the first end of described third connecting rod, and press down described third connecting rod the second end of described third connecting rod is upwarped, to trigger described brake assemblies action.
Preferably, in above-mentioned anti-race mill apparatus, described linkage also comprises: the 4th connecting rod, and it is L shaped that first end is bent upwards formation, and the second end is connected with described brake assemblies; It is L shaped that the second end of described third connecting rod is bent downwardly formation, the first end engagement of the second end of described third connecting rod and described the 4th connecting rod, when the second end of described third connecting rod upwarps, the first end of the second end of described third connecting rod and described the 4th connecting rod departs from, to trigger described brake assemblies action.
Preferably, in above-mentioned anti-race mill apparatus, described brake assemblies comprises: fixing-line device, be fixed on described base, and comprise draw-in groove and pull handle, the groove of described draw-in groove and described pulley is in same plane, and described pull handle is connected with the second end of described the 4th connecting rod; Stopper slot, corresponding with described draw-in groove, for spacing strand mill pull rope.
Preferably, in above-mentioned anti-race mill apparatus, described stopper slot is the groove of a spacing pulley, the rotating shaft of described spacing pulley is set up on one first otic placode, the second otic placode, relatively described the second otic placode of described the first otic placode is articulated with on described base turningly, and described the second otic placode is fixed on described base.
Preferably, in above-mentioned anti-race mill apparatus, described the first pulley, the 3rd pulley include height regulating mechanism, to adjust the height of described the first pulley, the 3rd pulley, thereby make strand mill pull rope contact tightr with described the second pulley.
Analyze knownly, the utility model can detect the direction of motion of strand mill pull rope automatically, and clamp in time when pull rope generation counter motion, prevents from running mill phenomenon and occurs, thereby avoid running all kinds of accidents of mill initiation.
Accompanying drawing explanation
Fig. 1 is the perspective view of the utility model preferred embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details.
As shown in Figure 1, the main base 1 of this preferred embodiment, be located at base 1 first half 103 detection components, be located at the brake assemblies of base 1 latter half of 104.What need to illustrate in advance is, first half 103, latter half of 104 and the master of following base 1 depending on the term in the expression orientation such as side 101, backsight side 102, be all for convenience of description, and should not be construed as to base 1 and on shape, the structure of detection components, brake assemblies, any restriction of position.
Particularly, base 1 is mainly used in providing support for detection components, brake assemblies.Preferably, base 1 is tabular, and the front end of base 1 is fixed with draw ring 105, and draw ring 105 is mainly used in being connected with a fixture.
Detection components is positioned at the first half 103 of base 1, and for detection of the direction of motion of strand mill pull rope, and when pull rope generation counter motion, when pull rope is away from strand mill, this direction of detection components perception changes, and this variation is passed to brake assemblies.
Brake assemblies is positioned at the latter half of 104 of base 1, and it is connected with detection components; The opposite direction of detection components detection strand mill pull rope triggers brake assemblies action while moving, and makes brake assemblies clamping twist mill pull rope.
Preferably, as shown in Figure 1, detection components mainly comprises for detection of the pulley mechanism of the direction of motion of strand mill pull rope, the direction of pull rope is changed to the transmission mechanism that signal drives to brake assemblies.Pulley mechanism and transmission mechanism couple.Wherein, pulley mechanism comprises three pulleys and corresponding frames, but three pulleys are respectively the 3rd pulley that the first pulley 24, the second pulley 34 and unmarked and the first pulley 24 have same structure.The groove of three pulleys is all for spacing strand mill pull rope, wherein 34, the second pulley is the direction of motion change for detection of pull rope, and by its rotating shaft 36, this change is passed to transmission mechanism, make transmission mechanism when the second pulley 34 detects the strand mill pull rope direction of motion and changes, trigger brake assemblies, thereby clamping pull rope prevents from running mill phenomenon, occur.
More specifically, in pulley mechanism, the first pulley 24, the second pulley 34 are parallel with the axis of the 3rd pulley, and the first pulley 24, the 3rd pulley are positioned at the both sides of the second pulley 34.The first pulley 24, the height of the 3rd pulley 34 is different from the second pulley, for example, lower than the second pulley 34, make pull rope through the upper grooves of the first pulley 24, the lower grooves of the second pulley 34, the upper grooves of the 3rd pulley, also be, make pull rope pass through the groove of three pulleys with the state of slight curvature, thereby make strand mill pull rope can closely embed the first pulley 24, in the groove of the second pulley 34 and the 3rd pulley, make whereby pull rope contact tightr with the second pulley 34, the second pulley 34 can be more timely, the direction of perception pull rope changes more accurately.
More preferably, the first pulley 24 is between two otic placodes 21,22, being positioned at the main otic placode 22 depending on side 101 1 sides of base 1 is an overall structure, the otic placode 21 that is positioned at base 1 backsight side 102 1 sides is two-part structure: comprise upper ear plate 211, lower ear plate 212, the upper end of the lower end of upper ear plate 211 and lower ear plate 212 is hinged, is also that upper ear plate 211 can be to the direction upset of backsight side 102.Because the 3rd pulley is identical with the first pulley 24 structures, do not repeat them here.The second pulley 34 is between two otic placodes 31,35, and the below of otic placode 31 is one can pass through the space 30 of pull rope, and 30 belows, space are a riser 32.At the scene during operation, to 102 upsets of backsight side, make pull rope from upper ear plate 211, in space 30, embed the groove of three pulleys upper ear plate 211.Visible, the turning design of upper ear plate 211 and the unsettled design of otic placode 31 facilitate pull rope to embed in the groove of three pulleys at the scene.More preferably, in order to increase the intensity of the support otic placode of three pulleys, avoid pull rope to come off simultaneously, this preferred embodiment also comprises a stiffener, after pull rope embeds the groove of pulley, by bolt, stiffener is fastened on otic placode 31, riser 32, this stiffener also extends and is covered on upper ear plate 211, lower ear plate 212 simultaneously.
More preferably, first pulley 24 of this preferred embodiment, the 3rd pulley include height regulating mechanism, to adjust the height of the first pulley 23, the 3rd pulley, thereby make strand mill pull rope contact tightr with the second pulley.Particularly, base 1 below is provided with vertical double-screw bolt 82 and a not shown drive plate, and base 1 is provided with a threaded block 81, and threaded block 81 is provided with a screwed hole, the upper end of double-screw bolt 82 is through base 1 and screw in this screwed hole, and drive plate is threaded with double-screw bolt 82 simultaneously.The two ends of the rotating shaft 23 of the first pulley 24 can be up or down through being set up in respectively column 25 upper ends after otic placode 21,22, the lower end of column 25 is fixed on drive plate through base 1.When double-screw bolt 82 rotation, drive drive plate to move up and down, drive plate drives column 25 to slide up and down, thereby drives rotating shaft 23 and the first pulley 24 to move up and down.Regulate the height of the first pulley 24 to be convenient to pull rope to embed in its groove, be convenient to adjust the frictional force between pull rope and three pulleys simultaneously.
Shown in Fig. 1, transmission mechanism comprises again: foreign steamer 37, ratchet and pawl arrangement 38 and linkage.Ratchet and pawl arrangement 38 is located at the rotating shaft 36 of the second pulley 34 through one end of otic placode 35, and riser 39 is supported in this end of rotating shaft 36.The ratchet of ratchet and pawl arrangement 38 is when strand mill pull rope occurs to move in the other direction, and the ratchet of driving pawl detent mechanism 38 rotates; Foreign steamer 37 is fixed on the ratchet outside of ratchet and pawl arrangement 38.
Foreign steamer 37, ratchet and pawl arrangement 38 are identical with the structure of bicycle freewheel (freewheel clutch), for cost-saving, and the bicycle freewheel that directly adopted embodiment illustrated in fig. 1.When normal traction, bicycle freewheel transfixion, once pull rope reverse movement will drive bicycle freewheel to rotate.
Linkage is connected with foreign steamer 37, for making the rotation of foreign steamer 37 drive to brake assemblies, to trigger brake assemblies action.Preferably, linkage comprises: first connecting rod 51, second connecting rod 52, third connecting rod 55, the 4th connecting rod 6.The first end of first connecting rod 51 is connected with foreign steamer 37.The second end of the first end of second connecting rod 52 and first connecting rod 51 is hinged, and the second end is articulated with on the supporting seat 53 on base 1.The middle part of third connecting rod 55 is articulated with the supporting seat 58 on base 1 by an articulated slab 59, and its first end extends a flat board 54 to foreign steamer 37 belows, and dull and stereotyped 54 are positioned at the first end below of second connecting rod 52.When foreign steamer 37 rotates, drive second connecting rod 52 to tilt to the first end of third connecting rod 55, and press down third connecting rod 55 the second end of third connecting rod 55 is upwarped, to trigger brake assemblies action.It is L shaped that the first end of the 4th connecting rod 6 is bent upwards formation, and the second end is connected with the fixing-line device 4 of brake assemblies.It is L shaped that the second end 551 of third connecting rod 55 is bent downwardly formation, the second end 551 of third connecting rod 55 and 61 engagements of the first end of the 4th connecting rod 6, when the second end of third connecting rod 55 upwarps, the second end 551 of third connecting rod 55 and the first end of the 4th connecting rod 6 61 depart from, to trigger fixing-line device 4 actions of brake assemblies.
In order to prevent that third connecting rod 55 from unnecessary swing occurring, this preferred embodiment also comprises limitting casing 57, and this limitting casing 57 is a shape structure, and third connecting rod 55 is from wherein passing through.In addition, for third connecting rod 55 can be resetted in time, and make the tightr of the second end 551 of third connecting rod 55 and the first end of the 4th connecting rod 6 61 engagements, below the first end of third connecting rod 55, be provided with a vertical Compress Spring 56, Compress Spring 56 is fixed between third connecting rod 55 and base 1.
Again as shown in Figure 1, brake assemblies comprises fixing-line device 4 and spacing pulley 73.Fixing-line device 4 is fixed on base 1, comprises draw-in groove 40 and pull handle 41.Because fixing-line device 4 is prior art, Fig. 1 only schematically shows its structure, at this, also repeats no more its structure.Draw-in groove 40 is with the groove of aforementioned three pulleys in same plane, and the front end 412 of pull handle 41 is connected with the second end of the 4th connecting rod 6, and 411 of rear ends are pull-handle ring.The groove of spacing pulley 73 is as the stopper slot of pull rope, and it is corresponding with draw-in groove 40, for spacing strand mill pull rope, prevents that pull rope from swinging.
More preferably, the rotating shaft 74 of spacing pulley 73 is set up on an otic placode 71, otic placode 72, and the relative otic placode 72 of otic placode 71 is articulated with on base 1 turningly, and the second otic placode 72 is fixed on base 1.Also, be similar to the frames of the first pulley 24, otic placode 71 comprises upper ear plate 711, lower ear plate 712, and upper ear plate 711 can, to backsight side 102 upsets of base 1, be convenient to pull rope to embed in the groove of draw-in groove 40 and spacing pulley 73.Further, the upper end of otic placode 72 is a bolt 75, two nuts 76, and the end of rotating shaft 74 is positioned at bolt 75 downsides.During upset upper ear plate 711, swivel bolt 75, be convenient to rotating shaft 74 and depart from otic placode 72, after pull rope is put into 72 of draw-in groove 40 and otic placode 71, otic placodes, make again upper ear plate 711 vertical, pull rope embeds in the groove of spacing pulley 73, then bolt 75 is screwed in two nuts 76, and bolt 75 is pressed in rotating shaft 74.
In application, during this preferred embodiment, the pull-handle ring of fixing-line device 4 can be connected with the tractor that strand mill is installed, and draw ring 105 is by cable etc. and a fixture, earth anchor for example, connection.By foregoing description, after pull rope being embedded to the groove and draw-in groove 40 of the first pulley 24, the second pulley 34, the 3rd pulley, spacing pulley, just can normal operation.When there is pull rope, move in the other direction, while having the trend that departs from strand mill, the second pulley 34 opposite spin immediately, drive foreign steamer 37 to rotate, the second end of third connecting rod 55 upwarps and departs from the first end of the 4th connecting rod 6,41 of pull handles are clamped on pull rope in draw-in groove 40 immediately, have enough weight and power, so it can prevent that pull rope from further moving due to the tractor of strand mill being installed.
In sum, the utility model can prevent from simply and easily running mill phenomenon and occur, and has greatly improved the fail safe at electric operating scene.Meanwhile, the utility model is simple in structure, with low cost, is convenient to large-scale promotion.Certainly, the utility model is not only applicable to strand mill pull rope, and can be applied in any occasion that needs rope unidirectional motion, will avoid rope generation to move simultaneously in the other direction.
As known by the technical knowledge, the utility model can be realized by other the embodiment that does not depart from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, and is not only.All changes within the scope of the utility model or within being equal to scope of the present utility model are all included in the utility model.
Claims (10)
1. an anti-race mill apparatus, is characterized in that, comprising:
Base, for providing support;
Detection components, is positioned on described base, for detection of the direction of motion of strand mill pull rope;
Brake assemblies, is positioned on described base, is connected with described detection components; The opposite direction of described detection components detection strand mill pull rope triggers described brake assemblies action while moving, and makes described brake assemblies clamping twist mill pull rope.
2. anti-race mill apparatus according to claim 1, is characterized in that, described base is tabular, and the front end of described base is fixed with draw ring.
3. anti-race mill apparatus according to claim 1, is characterized in that, described detection components comprises:
Pulley mechanism, comprises at least one pulley, and the groove of described pulley is for spacing strand mill pull rope, to detect the direction of motion of strand mill pull rope;
Transmission mechanism, is connected with rotating shaft and the described brake assemblies of described pulley, while changing for the strand mill pull rope direction of motion detected at described pulley mechanism, triggers described brake assemblies.
4. anti-race mill apparatus according to claim 3, it is characterized in that, described pulley mechanism comprises the first parallel pulley of axis, the second pulley and the 3rd pulley, described the first pulley, the 3rd pulley are positioned at the both sides of described the second pulley, and the height of described the first pulley, the 3rd pulley is different from described the second pulley, so that strand mill pull rope can closely embed in the groove of described the first pulley, the second pulley and the 3rd pulley;
The rotating shaft of described the second pulley is connected with described transmission mechanism.
5. anti-race mill apparatus according to claim 3, is characterized in that, described transmission mechanism comprises:
Ratchet and pawl arrangement, is located at rotating shaft one end of described pulley, and the ratchet of described ratchet and pawl arrangement, when strand mill pull rope occurs to move, drives the ratchet of described ratchet and pawl arrangement to rotate in the other direction;
Foreign steamer, is fixed on the ratchet outside of described ratchet and pawl arrangement;
Linkage, is connected with described foreign steamer, for making the rotation of described foreign steamer drive to described brake assemblies, to trigger described brake assemblies action.
6. anti-race mill apparatus according to claim 5, is characterized in that, described linkage comprises:
First connecting rod, first end is connected with described foreign steamer;
Second connecting rod, the second end of first end and described first connecting rod is hinged, and the second end is articulated with on described base;
Third connecting rod, middle part is articulated with on described base, and first end is positioned at the first end below of described second connecting rod; When described foreign steamer rotates, drive described second connecting rod to tilt to the first end of described third connecting rod, and press down described third connecting rod the second end of described third connecting rod is upwarped, to trigger described brake assemblies action.
7. anti-race mill apparatus according to claim 6, is characterized in that, described linkage also comprises:
The 4th connecting rod, it is L shaped that first end is bent upwards formation, and the second end is connected with described brake assemblies;
It is L shaped that the second end of described third connecting rod is bent downwardly formation, the first end engagement of the second end of described third connecting rod and described the 4th connecting rod, when the second end of described third connecting rod upwarps, the first end of the second end of described third connecting rod and described the 4th connecting rod departs from, to trigger described brake assemblies action.
8. anti-race mill apparatus according to claim 7, is characterized in that, described brake assemblies comprises:
Fixing-line device, is fixed on described base, comprises draw-in groove and pull handle, and the groove of described draw-in groove and described pulley is in same plane, and described pull handle is connected with the second end of described the 4th connecting rod;
Stopper slot, corresponding with described draw-in groove, for spacing strand mill pull rope.
9. anti-race mill apparatus according to claim 8, it is characterized in that, described stopper slot is the groove of a spacing pulley, the rotating shaft of described spacing pulley is set up on one first otic placode, the second otic placode, relatively described the second otic placode of described the first otic placode is articulated with on described base turningly, and described the second otic placode is fixed on described base.
10. anti-race mill apparatus according to claim 4, it is characterized in that, described the first pulley, the 3rd pulley include height regulating mechanism, to adjust the height of described the first pulley, the 3rd pulley, thereby make strand mill pull rope contact tightr with described the second pulley.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420072865.4U CN203722132U (en) | 2014-02-20 | 2014-02-20 | Winch running prevention device |
| JP2016503534A JP6063089B2 (en) | 2014-02-20 | 2014-05-26 | Anti-reverse device |
| EP14883308.0A EP3109959B1 (en) | 2014-02-20 | 2014-05-26 | Reverse-retreat preventing apparatus |
| PCT/CN2014/078384 WO2015123929A1 (en) | 2014-02-20 | 2014-05-26 | Reverse-retreat preventing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420072865.4U CN203722132U (en) | 2014-02-20 | 2014-02-20 | Winch running prevention device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722132U true CN203722132U (en) | 2014-07-16 |
Family
ID=51161258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420072865.4U Expired - Fee Related CN203722132U (en) | 2014-02-20 | 2014-02-20 | Winch running prevention device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203722132U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956676A (en) * | 2014-02-20 | 2014-07-30 | 国家电网公司 | Reverse-retreating preventing device |
-
2014
- 2014-02-20 CN CN201420072865.4U patent/CN203722132U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956676A (en) * | 2014-02-20 | 2014-07-30 | 国家电网公司 | Reverse-retreating preventing device |
| CN103956676B (en) * | 2014-02-20 | 2016-08-03 | 国家电网公司 | Anti-race mill apparatus |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20180220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |