CN204457451U - Bracing or strutting arrangement, mast assembly and rotary drilling rig - Google Patents
Bracing or strutting arrangement, mast assembly and rotary drilling rig Download PDFInfo
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- CN204457451U CN204457451U CN201420870454.XU CN201420870454U CN204457451U CN 204457451 U CN204457451 U CN 204457451U CN 201420870454 U CN201420870454 U CN 201420870454U CN 204457451 U CN204457451 U CN 204457451U
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- support bar
- bracing
- strutting arrangement
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- 238000005553 drilling Methods 0.000 title claims abstract description 13
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000003754 machining Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000005474 detonation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a kind of bracing or strutting arrangement, mast assembly and rotary drilling rig.This bracing or strutting arrangement comprises support bar and support set, and support bar has first end and the second end, and first end is provided with connecting hole, and support bar is provided with screw thread; The length of support set is less than the length of support bar, the inwall of support set is provided with screw thread, and be sheathed on movably on support bar by threaded engagement, and, support set is on the axial direction of support bar, and the support end moving to support set in the length range that can be in support bar completely from support set stretches out the length range of support bar from the second end.Bracing or strutting arrangement of the present utility model can regulate bearing length, compliance during lifting supporting apparatus reply different condition, and structure is simple, facilitates easy-to-use.
Description
Technical field
The utility model relates to engineering machinery field, particularly a kind of bracing or strutting arrangement, mast assembly and rotary drilling rig.
Background technology
The mast top of rotary drilling rig is provided with pulley yoke, for installing pulley and wire rope, to lift drilling rod etc.In rotary drilling rig transportation, in order to reduce the size of equipment as far as possible, pulley yoke is needed to pack up from operating position, then operationally launch again, as depicted in figs. 1 and 2, Fig. 1 is that pulley yoke 1 overturns around the hinged place at mast 2 top, and Fig. 2 is that pulley yoke 1 turn to complete stowed position, after packing up, the pulley yoke supporting seat 3 of pulley yoke 1 is bonded to each other with the mast supporting seat 4 of mast.Now, the bottom surface of pulley yoke 1 forms an angle with the top shape of mast 2, what adopt due to pulley yoke 1 and mast 2 is be articulated and connected, in transportation, pulley yoke 1 can pitch and occur impacting between structural member (such as pulley yoke supporting seat 3 and mast supporting seat 4), produce noise, even cause structural member to damage.
In order to avoid above-mentioned situation occurs, existing rotary drilling rig is in transportation, a bracing frame 5 can be assembled between mast 2 top and pulley yoke 1, the structure of bracing frame 5 as shown in Figures 2 and 3, this bracing frame 5 is utilized to withstand pulley yoke 1, make it with mast 2, relative motion to occur, and then prevent from producing between pulley yoke 1 and mast 2 impacting, avoid producing noise and structural member damage.
But, existing bracing frame 5 adopts fixing length, due to reasons such as pulley yoke supporting seat 3 and the machining accuracy of mast supporting seat 4 are limited, when the stowed position shown in Fig. 2, the bottom surface of pulley yoke 1 and the top of mast 1 form angle and are difficult to accurately determine, therefore, often occur that bracing frame 5 cannot normally be put between pulley yoke 1 and mast 2, cannot support.Also some existing bracing frame 5 adopts length-adjustable form of structure, but the length-adjustable bracing frame in existing design mostly is a rhizoid pipe and two rhizoid bars pass through threaded engagement, two rhizoid bars are respectively used to be connected to pulley yoke 1 and mast 2, by rotating fiber tube, two screw mandrels can stretch out from the two ends of fiber tube, can play a supporting role after reaching applicable length, but, the bracing frame needs internal thread that processing two kinds of rotation directions are different on fiber tube of this structure and external screw thread, technique is more complicated, cost is higher, and, be limited to bracing frame 5 and pulley yoke 1 and the existing fixed form of mast 2, the dismounting of bracing frame 5 is very inconvenient, inefficiency.
Therefore, for the above-mentioned deficiency of prior art, provide a kind of new design support problem solved between mast and pulley yoke to be those skilled in the art's technical problems urgently to be resolved hurrily.
In background technology accompanying drawing
1, pulley yoke; 2, mast; 3, pulley yoke supporting seat; 4, mast supporting seat; 5, bracing frame;
In the utility model accompanying drawing
10, support bar; 20, support set; 30, locking nut; 100, mast; 110, supported hole; 200, pulley yoke; 210, holder.
Utility model content
In view of this, the utility model proposes a kind of bracing or strutting arrangement, it can be used in supporting mast and pulley yoke, and easy disassembly, be simple and easy to use.
Particularly, this bracing or strutting arrangement comprises: support bar, and described support bar has first end and the second end, and described first end is provided with connecting hole, and described support bar is provided with screw thread;
Support set, the length of described support set is less than the length of described support bar, the inwall of described support set is provided with screw thread, and be sheathed on described support bar movably by threaded engagement, and, described support set is on the axial direction of described support bar, and the support end moving to described support set in the length range that can be in described support bar completely from described support set stretches out the length range of described support bar from described second end.
Further, the second end of described support bar is provided with connecting hole.
Further, the surface of the support end of described support set is the conical surface or sphere, or the support end of described support set is provided with the catch of radial protrusion.
Further, the cross section outline at least partially of described support set is polygon, or the external surface of described support set is provided with skid resistant course.
Further, described bracing or strutting arrangement also comprises the locking nut being sheathed on described support bar by threaded engagement movably, and described locking nut is positioned at the side of the support end away from described support set.
Further, described support bar is provided with for limiting the shaft shoulder of described locking nut to described first end movement.
Further, described support bar is ladder shaft-like, described support bar is divided into Part I and Part II, described Part I is near described first end, described Part II is near described second end, the diameter of described Part I is greater than the diameter of described Part II, and the screw thread on described support bar is located on described Part II.
When adopting bracing or strutting arrangement of the present utility model, can by the first end of support bar by connecting hole and the first supported object hinged, when this bracing or strutting arrangement of needs supports between this first supported object and second supported object, can rotary support cover, second end of its support end from support bar is stretched out, select suitable bearing length, then the support end of support set is connected and be supported on the second supported object.Therefore, this bracing or strutting arrangement can regulate bearing length, compliance during lifting supporting apparatus reply different condition, and structure is simple, facilitates easy-to-use.
On the other hand, the utility model also provides a kind of mast assembly, comprise mast and the pulley yoke being hinged on described mast top, described pulley yoke is hinged with the bracing or strutting arrangement as above described in any one, and, the described first end of described support bar is hinged to described pulley yoke, and the top of described mast offers and the supported hole of the support end corresponding matching of described support set or support slot.
Further, described pulley yoke is provided with holder, is selectively connected with the second end of described connecting rod;
Described supported hole is bellmouth, and the diameter near the side of described bracing or strutting arrangement is greater than the diameter of the side away from described bracing or strutting arrangement.
Mast assembly of the present utility model is provided with length-adjustable bracing or strutting arrangement, improve the flexibility of bracing or strutting arrangement, under angle between pulley yoke and mast is difficult to exactly determined situation because of problems such as machining accuracies, its bracing or strutting arrangement adopted still can utilize length-adjustable characteristic to make the disassemble and assemble work of bracing or strutting arrangement very convenient, promote operating efficiency, and its support device structure is simple, facilitates easy-to-use.
Another aspect, the utility model also provides a kind of rotary drilling rig, and it is provided with mast assembly as above.
Rotary drilling rig of the present utility model is provided with above-mentioned mast assembly, therefore, has the technique effect identical with above-mentioned mast assembly, repeats no more.
Accompanying drawing explanation
The accompanying drawing forming a part of the present utility model is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is prior art middle mast, pulley yoke and bracing frame annexation structural representation, and wherein, pulley yoke is in the process of packing up;
Fig. 2 is the mast shown in Fig. 1, pulley yoke and bracing frame annexation structural representation, and wherein, pulley yoke is in complete stowed position;
Fig. 3 is the mast shown in Fig. 2, another visual angle close-up schematic view of pulley yoke and bracing frame annexation;
The structural representation of a kind of bracing or strutting arrangement that Fig. 4 provides for the utility model embodiment, wherein, support set is in the length range of support bar;
Fig. 5 is the structural representation of the bracing or strutting arrangement shown in Fig. 4, and wherein, the support end of support set is in outside the length range of support bar;
The detonation configuration schematic diagram that Fig. 6 is the bracing or strutting arrangement shown in Fig. 4;
The structural representation of a kind of mast assembly that Fig. 7 provides for the utility model embodiment, wherein, described pulley yoke is in complete stowed position;
Fig. 8 is the mast assembly structure schematic diagram shown in Fig. 7, wherein, eliminates bracing or strutting arrangement;
Fig. 9 is the mast assembly structure schematic diagram shown in Fig. 7, and wherein, described pulley yoke is in operating position.
Description of reference numerals
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the utility model and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
Fig. 1 is prior art middle mast, pulley yoke and bracing frame annexation structural representation, and wherein, pulley yoke is in the process of packing up; Fig. 2 is the mast shown in Fig. 1, pulley yoke and bracing frame annexation structural representation, and wherein, pulley yoke is in complete stowed position; Fig. 3 is the mast shown in Fig. 2, another visual angle close-up schematic view of pulley yoke and bracing frame annexation; The structural representation of a kind of bracing or strutting arrangement that Fig. 4 provides for the utility model embodiment, wherein, support set is in the length range of support bar; Fig. 5 is the structural representation of the bracing or strutting arrangement shown in Fig. 4, and wherein, the support end of support set is in outside the length range of support bar; The detonation configuration schematic diagram that Fig. 6 is the bracing or strutting arrangement shown in Fig. 4; The structural representation of a kind of mast assembly that Fig. 7 provides for the utility model embodiment, wherein, described pulley yoke is in complete stowed position; Fig. 8 is the mast assembly structure schematic diagram shown in Fig. 7, wherein, eliminates bracing or strutting arrangement; Fig. 9 is the mast assembly structure schematic diagram shown in Fig. 7, and wherein, described pulley yoke is in operating position.
As shown in Figures 4 to 6, the bracing or strutting arrangement that the utility model embodiment provides it comprise support bar 10 and support set 20, wherein, support bar 10 has first end and the second end, the first end left end of support bar 10 (in the corresponding diagram) is provided with connecting hole, for connecting the first supported object, and support bar 10 is provided with screw thread; The length of support set 20 is less than the length of support bar 10, the inwall of support set 20 is provided with screw thread, and be sheathed on support bar 10 movably by threaded engagement, and, support set 20 is on the axial direction of support bar 10, and the support end that can move to support set 20 in the length range that support set 20 is in support bar 10 completely stretches out the length range of support bar 10 from the second end of support bar 10 right-hand member of support bar 10 (the corresponding diagram).
What need first to illustrate is, the support end of above-mentioned support set 20 refers to that support set 20 stretches out its length range and one end for connecting the second supported object from the second end of support bar 10, therefore, the state when support end of above-mentioned " support set 20 is in the length range of support bar 10 completely " meaning and support set 20 not yet stretches out from the second end of support bar 10, as shown in Figures 4 to 6, the support end of support set 20 is the right-hand member of support set 20.The support bar 10 that bracing or strutting arrangement in this embodiment comprises and support set 20 pass through threaded engagement, 20 can be overlapped by rotary support, make it axially moving at support bar 10, realize the length of adjustment bracing or strutting arrangement, in conjunction with see shown in Fig. 4 and Fig. 5, along arrow A direction rotary support cover 20 in figure, second end of the support end of support set 20 (i.e. right-hand member) from support bar 10 can be screwed out, namely support set 20 moves to the position in Fig. 5 from the position Fig. 4.After the support end back-out of support set 20, it may be used for being connected with the second supported object, is equivalent to the entire length adding bracing or strutting arrangement.
When adopting the bracing or strutting arrangement in the present embodiment, can by the first end of support bar 10 by connecting hole and the first supported object hinged, when this bracing or strutting arrangement of needs supports between this first supported object and second supported object, 20 can be overlapped by rotary support, second end of its support end from support bar 10 is stretched out, select the length of suitable bracing or strutting arrangement, then the support end of support set 20 is connected and be supported on the second supported object.Therefore, the bracing or strutting arrangement of this embodiment can regulate bearing length, compliance during lifting supporting apparatus reply different condition (distance such as between two supported objects can change), and structure is simple, facilitates easy-to-use.
As preferably, second end (i.e. right-hand member) of support bar 10 is provided with connecting hole equally, when leaving unused for bracing or strutting arrangement, second end also can be connected to the first supported object by connecting hole, play the effect of fixed placement or storage bracing or strutting arrangement on the first supporter, when needing bracing or strutting arrangement to support, first this second end is unloaded from this first supported object.Those skilled in the art should be understood that, when the second end is provided with connecting hole, in order to ensure that this connecting hole can be used, therefore, time in the length range that support set 20 is in support bar 10 completely, should ensure that the connecting hole of support bar 10 second end exposes and available; Under the prerequisite not having other contrary, this explanation is applicable equally in the following content of this paper.
Composition graphs 4 to Fig. 6 again, the surface of the support end of the support set 20 in the bracing or strutting arrangement of this embodiment is preferably the conical surface or sphere, because the front end size (diameter) of the conical surface or sphere is less, therefore can so that support end be abutted to the groove or hole on the second supported object surface, because the size at the rear portion of the conical surface or sphere becomes large after entering, therefore can make the surface of groove or the surface contact in hole of support end and the second supported object, be formed and firmly abut, be unlikely to slide.Alternatively, this support end can also be provided with the catch of radial protrusion, when when the groove on support end and the second supported object or hole or other respective outer side edges, this catch can with the surface contact of the second supported object, make support end form firm abutting with the second supported object, reach the effect identical with the aforesaid conical surface or spherical structure.
In addition, support set 20 at least partially or the outline in the cross section of a segment length be polygon, such as be designed to quadrangle, pentagon or hexagon, or directly at the platform that the surface design two of support set 20 is relative, can handled easily personnel grip or clamp standoff cover 20 like this, be convenient to force during to overlap 20 at rotary support, make the length adjusting bracing or strutting arrangement more convenient.The direct free-hand gripping support set 20 of operating personnel as optional, skid resistant course can also be provided with at the external surface of support set 20, so that can carry out rotary manipulation easily.
As shown in Figures 4 to 6, the bracing or strutting arrangement of the present embodiment also preferably includes the locking nut 30 be sheathed on movably by threaded engagement on support bar 10, and this locking nut 30 is arranged on the side of the support end away from support set 20, the left end namely near support set 20 is arranged.This locking nut 30 can stop support set 20 to be moved to the left, therefore when the length range abutting with the second supported object that the support end of support set 20 stretches out support bar 10 supports, locking nut 30 can be threaded to the left end near support set 20, support set 20 is locked, support set 20 is stoped to move to left and cause bracing or strutting arrangement contraction in length, even cause the support end of support set 20 to depart from from supported object, thus effectively ensure the support effect of bracing or strutting arrangement.
As further preferred version, this support bar 10 can also being provided with the shaft shoulder, moving to the direction away from support set 20 for limiting locking nut 30.Shown in composition graphs 4 and Fig. 6, for bracing or strutting arrangement, when locking nut 30 is moved to the left, so that support set 20 can move in the length range of support bar 10 completely, if now the diameter of support bar 10 on the left of locking nut 30 is less than the diameter of support bar 10 on the right side of locking nut 30, then locking nut 30 is easy to come off from left side.This embodiment is by designing the shaft shoulder at support bar 10, move to left to extreme position at locking nut 30, namely support set 20 is now allowed can be in completely in the length range of support bar 10, the position of the shaft shoulder should be positioned at the left side of locking nut 30, thus restriction locking nut 30 continues to be moved to the left, and prevents it from coming off from the left end of support bar 10.
The shaft shoulder can be designed as the flange on support bar 10, also can implement as follows.Namely as shown in Figure 5 and Figure 6, support bar 10 is in ladder shaft-like, it is two-stage multidiameter shown in figure, support bar 10 is divided into Part I and Part II, Part I its first end corresponding, Part II its second end corresponding, the diameter of Part I is greater than the diameter of Part II, screw thread on support bar 10 is located on the Part II on right side, and support set 20 and locking nut 30 are also all sheathed on Part II.The diameter difference of Part I and Part II forms the shaft shoulder in both intersections, can limit locking nut 30 equally and be moved to the left.In addition, this design also has another one benefit to process convenience exactly, because, if when utilizing raw material (such as round steel) to process this support bar 10, because materials statement surface accuracy is poor, when machining screw, need first the raw material surface car for machining screw place to be fallen one deck, form ladder shaft-like, ensure the surface accuracy after processing, then in this machining screw on the surface, therefore, this design can make full use of process, without the need to extra procedure of processing, also can not produce unnecessary waste of material.
As shown in Figure 7 to 9, another embodiment of the utility model also provides a kind of mast assembly, it pulley yoke 200 comprising mast 100 and be hinged on mast 100 top, pulley yoke 200 is also hinged with the bracing or strutting arrangement that above-described embodiment provides, the first end of support bar 10 is hinged on pulley yoke 200 by connecting hole, and near the bottom surface of pulley yoke 200 (under duty, the face contacted with mast 100 end face) arrange, the top of mast 100 offers the supported hole 110 with the support end corresponding matching of support set 20, as shown in Figure 7, when pulley yoke 200 is packed up completely, the support end of support set 20 can insert in this supported hole 110.The form of support slot can also be replaced with as this supported hole optional.Mast 100 and pulley yoke 200 also have other structures, as supporting seat etc., all see the configuration mode of prior art, no longer can describe.
Because the bracing or strutting arrangement in above-described embodiment can be moved on support bar 10 by support set 20, and then it is adjustable to realize bearing length, therefore, this mast assembly uses this length-adjustable bracing or strutting arrangement, improve the flexibility of bracing or strutting arrangement, under angle between pulley yoke and mast is difficult to exactly determined situation because of problems such as machining accuracies, its bracing or strutting arrangement adopted still can utilize length-adjustable characteristic to make disassemble and assemble work very convenient, promote operating efficiency, and its support device structure is simple, facilitates easy-to-use.
Further, this pulley yoke 200 is also provided with holder 210, selectively be connected with the second end of connecting rod 10 and coordinate, as shown in Figure 7 to 9, this holder 210 there is the groove of the second end of an accommodation connecting rod 10, groove walls is provided with bearing pin, second end of connecting rod 10 is provided with connecting hole, so that when bracing or strutting arrangement leaves unused, connecting rod 10 second end is connected on this holder 210 by the connection cooperation by bearing pin and connecting hole, plays the effect of fixing storage bracing or strutting arrangement.
The supported hole 110 at mast 100 top can also be preferably bellmouth, and the diameter of this bellmouth near the side (i.e. outside) of bracing or strutting arrangement is greater than the diameter away from bracing or strutting arrangement side (i.e. inner side), namely the opening of bellmouth is large, inner little, so both can so that the support end of support set 20 be inserted into supported hole 110 smoothly; Can also after the support end of support set 20 be inserted into supported hole 110 inside, because supported hole 110 inside diameter reduces the contact internal walls making support end and supported hole 110, when being limited in specific support angle, support set 20 continues to move to the direction in supported hole 110, ensures support effect; Can also coincide with the taper surface of the support end of support set 20 or spherical.In addition, if adopt support slot to replace supported hole 110, support slot also can adopt above-mentioned embodiment.
Embodiment of the present utility model also provides a kind of rotary drilling rig (not shown), and it is provided with any one mast assembly above-mentioned.This rotary drilling rig has mast assembly same as described above, therefore has beneficial aspects same as described above, repeats no more.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a bracing or strutting arrangement, is characterized in that, comprising:
Support bar (10), described support bar (10) has first end and the second end, and described first end is provided with connecting hole, and described support bar (10) is provided with screw thread;
Support set (20), the length of described support set (20) is less than the length of described support bar (10), the inwall of described support set (20) is provided with screw thread, and be sheathed on described support bar (10) movably by threaded engagement, and, described support set (20) is on the axial direction of described support bar (10), the support end moving to described support set (20) in the length range that can be in described support bar (10) completely from described support set (20) stretches out the length range of described support bar (10) from described second end.
2. bracing or strutting arrangement according to claim 1, is characterized in that, the second end of described support bar (10) is provided with connecting hole.
3. bracing or strutting arrangement according to claim 1, is characterized in that, the surface of the support end of described support set (20) is the conical surface or sphere, or the support end of described support set (20) is provided with the catch of radial protrusion.
4. bracing or strutting arrangement according to claim 1, is characterized in that, the cross section outline at least partially of described support set (20) is polygon, or the external surface of described support set (20) is provided with skid resistant course.
5. according to the bracing or strutting arrangement in claim 1-4 described in any one, it is characterized in that, described bracing or strutting arrangement also comprises the locking nut (30) being sheathed on described support bar (10) by threaded engagement movably, and described locking nut (30) is positioned at the side of the support end away from described support set (20).
6. bracing or strutting arrangement according to claim 5, is characterized in that, described support bar (10) is provided with for limiting the shaft shoulder of described locking nut (30) to described first end movement.
7. bracing or strutting arrangement according to claim 6, it is characterized in that, described support bar (10) is in ladder shaft-like, described support bar (10) is divided into Part I and Part II, described Part I is near described first end, described Part II is near described second end, and the diameter of described Part I is greater than the diameter of described Part II, and the screw thread on described support bar (10) is located on described Part II.
8. mast (100) assembly, comprise mast (100) and be hinged on the pulley yoke (200) at described mast (100) top, it is characterized in that, described pulley yoke (200) is hinged with as the bracing or strutting arrangement in claim 1-7 as described in any one, and, the described first end of described support bar (10) is hinged to described pulley yoke (200), and the top of described mast (100) offers and the supported hole (110) of the support end corresponding matching of described support set (20) or support slot.
9. mast according to claim 8 (100) assembly, is characterized in that, described pulley yoke (200) is provided with holder (210), is selectively connected with the second end of described connecting rod;
Described supported hole (110) is bellmouth, and the diameter near the side of described bracing or strutting arrangement is greater than the diameter of the side away from described bracing or strutting arrangement.
10. a rotary drilling rig, is characterized in that, is provided with mast as claimed in claim 8 or 9 (100) assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420870454.XU CN204457451U (en) | 2014-12-31 | 2014-12-31 | Bracing or strutting arrangement, mast assembly and rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420870454.XU CN204457451U (en) | 2014-12-31 | 2014-12-31 | Bracing or strutting arrangement, mast assembly and rotary drilling rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204457451U true CN204457451U (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420870454.XU Expired - Fee Related CN204457451U (en) | 2014-12-31 | 2014-12-31 | Bracing or strutting arrangement, mast assembly and rotary drilling rig |
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| CN (1) | CN204457451U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965294A (en) * | 2017-12-29 | 2018-04-27 | 三重工股份有限公司 | A kind of pulley blocks fixing device and rotary drilling rig |
-
2014
- 2014-12-31 CN CN201420870454.XU patent/CN204457451U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965294A (en) * | 2017-12-29 | 2018-04-27 | 三重工股份有限公司 | A kind of pulley blocks fixing device and rotary drilling rig |
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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: 20150708 |