CN104310217A - Cable retaining device for load test device of self-elevating platform cantilever beam - Google Patents
Cable retaining device for load test device of self-elevating platform cantilever beam Download PDFInfo
- Publication number
- CN104310217A CN104310217A CN201410487221.6A CN201410487221A CN104310217A CN 104310217 A CN104310217 A CN 104310217A CN 201410487221 A CN201410487221 A CN 201410487221A CN 104310217 A CN104310217 A CN 104310217A
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- disk
- rotating disk
- gear rope
- pulley
- rope device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a cable retaining device for a load test device of a self-elevating platform cantilever beam. The cable retaining device comprises a supporting part, a positioning part and a cable retaining part. The supporting part comprises a disk, at least two support plates are arranged on the peripheral wall of the disk, the support plates extend outwards and are uniformly arranged at interval along the circumferential direction of the disk, and the support plates are detachably connected to a drill floor. The positioning part is arranged on the inner wall of the disk and extends downwards along a vertical direction, the bottom portion of the positioning part is clamped on the inner wall of a turntable, and a wire rope passes through the positioning part. The cable retaining part is detachably connected to the top surface of the disk, and is used for lacing the wire rope and restricting the wire rope from swinging to the inner wall of the turntable. The invention avoids up and down movement of the wire rope driven by a top drive or left and right sway under the action of wind to easily wear the inner wall of the turntable, so as to increase the service life of the turntable.
Description
Technical field
The present invention relates to a kind of gear rope device of the load test apparatus for jack-up platform cantilever beam.
Background technology
Cantilever beam is the important component part of jack-up drilling unit, and it is made up of rig floor, derrick well system and pipe support district.Cantilever beam is at platform stern, and can be 22.86 meters along platform longitudinal direction to stern slippage ultimate range, rig floor, to platform port and starboard slippage 4.57 meters, coordinates to have come drilling operation, maximum drilling depth 10688 meters by the slippage of cantilever beam and rig floor.
This test needs to fulfil assignment the test under load that operating mode Analysis of A Cantilever Beam Under rig floor three location point derrick bands carry.Duration of test, test under load completes the operation in whole region under the load of regulation.Wherein, test under load load is divided into several part, and a part is in cantilever beam pipe support district, and a part is at rig floor conduit support, and some drives on hook on top.
Simultaneously, derrick test under load load adopts barge to add ballast Fluid Dynamics, the load of 907 tons is hung under pushing up the suspension ring driven, top is driven by steel wire hang barge, wirerope diameter used reaches 144mm and 96mm, and steel rope needs rotating disk through drilling well to connect barge, has very large challenge to execute-in-place.In jack-up platform cantilever beam test under load, top is driven load and is reached 907 tons, very high to the requirement of the Current Collector Sleave connecting load.It is that the frock that the steel plate devising a super large adds reinforced rib carrys out joint test load that domestic great Lian Chang does cantilever beam test under load.This mode has the following disadvantages:
(1) very high to the welding requirements of frock, need butt welded seam to do a series of flaw detection;
(2) because frock yardstick is large, during test, the hoisting difficulty of frock is large;
(3) bad adaptability of frock, can not meet the platform test under load of not shipmate type;
(4) frock yardstick is large, and depositing after test protects difficulty large.
Based on the comparison of above test under load scheme, test under load generally adopts diameter to be the mode that the steel rope of 144mm with 96mm is connected as test load with shackle.Be that the steel rope of 144mm will pass turret apertures owing to there being 8 strands of diameters, wherein, turret apertures diameter 1.2m, because test load is large, the quantity of corresponding steel rope and diameter are also large, in load lifting decentralization process, steel rope moves up and down or the inwall of double swerve rotating disk easy to wear under the action of the forces of the wind under drive is driven on top, thus damages rotating disk.
Summary of the invention
The technical problem to be solved in the present invention is the defect of steel rope rotating disk inwall easy to wear in the test under load in order to overcome jack-up platform cantilever beam of the prior art, provides a kind of gear rope device of the load test apparatus for jack-up platform cantilever beam.
The present invention solves above-mentioned technical matters by following technical proposals:
A kind of gear rope device of the load test apparatus for jack-up platform cantilever beam, this jack-up platform comprises the rig floor and being located at this cantilever beam top and is located at rotating disk on this rig floor, this load test apparatus comprises the steel rope of some endoporus through this rotating disk, its feature is, this gear rope device comprises a support portion, one location division and a gear rope portion, this support portion comprises a disk, the periphery wall of this disk is provided with at least two stay bearing plates, those stay bearing plates stretch out and circumferential uniform intervals along this disk is arranged, those stay bearing plates are detachable to be connected on this rig floor,
On the inwall that this location division is arranged at this disk and vertically to downward-extension, the bottom of this location division is arranged on the inwall of this rotating disk, this location division of those steel wire penetrating;
Gear rope portion is detachable is connected on the end face of this disk for this, and rocks for lacing wires rope and the restriction steel rope inwall to this rotating disk.
In this programme, the gear rope device of said structure form is adopted to be stuck on rotating disk, steel rope is played to the effect of gathering, steel rope can be avoided to move up and down under drive is driven on top or the inwall of double swerve rotating disk easy to wear under the action of the forces of the wind, add the service life of rotating disk.
Wherein, the setting of location division can guarantee that this gear rope device can not produce relative movement with rotating disk perpendicular on the axis direction of rotating disk, guarantees that gear rope device is to the limit effect of steel rope; The setting of support portion can guarantee that gear rope device can not produce relative motion with rotating disk on the axis direction of rotating disk, meanwhile, avoids the upper surface producing a friction force and this rotating disk that weares and teares between the lower surface of support portion and the upper surface of rotating disk.
Preferably, this gear rope portion comprise some fixed pulleys and with each corresponding support arranged of this fixed pulley, respectively this support comprises one and is detachablely connected to adapter plate on this disk and two boss be arranged at intervals on this adapter plate, and two these boss upwards extend along the upper surface of this adapter plate;
Respectively this fixed pulley comprises one for the pulley body of spacing this steel rope corresponding and sheave shaft, and this sheave shaft is fixed on corresponding two these boss, and this pulley body is sheathed on this sheave shaft, and this pulley body is between two these boss.
In this programme, adopt the gear rope device of said structure, steel rope is contacted with the pulley body of fixed pulley in left and right, upper and lower sliding process, reduces the friction force to steel rope, thus avoid steel rope and be subject to larger wearing and tearing and rupture, improve the safety of test under load; Meanwhile, pulley body limits the movement of steel rope towards rotating disk inwall direction, avoids steel rope to move up and down under drive is driven on top or the inwall of double swerve rotating disk easy to wear under the action of the forces of the wind, adds the service life of rotating disk.
Preferably, those fixed pulleys are arranged around the direction uniform intervals that the axis of this disk rotates.
In this programme, adopt said structure form, not only increase bulk strength and the stability of this gear rope device, improve the limit effect of fixed pulley to steel rope simultaneously.
Preferably, the quantity of this fixed pulley is six, and respectively this pulley body is circular arc cylinder.
In this programme, pulley body is circular arc cylinder, makes, while the friction force reducing steel rope and pulley body, to improve the limit effect of pulley body to steel rope.
Preferably, on a horizontal surface of the axis perpendicular to this disk, respectively this pulley body overlaps near the center of circle of the circular arc of this disk axis, and those circular arcs form a pulley circle, this pulley circle diameter is less than the internal diameter of this rotating disk, and the center of circle of this pulley circle is positioned on the axis of this rotating disk.
In this programme, adopt said structure form, can avoid completely steel rope in the process of rocking with the contact internal walls of rotating disk and the rotating disk that weares and teares.
Preferably, respectively the central angle of this circular arc is 56 °.
In this programme, adopt said structure form, can ensure to carry out spacing to the steel rope in whole pulley circle region.
Preferably, respectively the thickness of this stay bearing plate is all equal with the thickness of this disk.
Preferably, the dead in line of the axis of this disk and this rotating disk, and the external diameter of this disk is more than or equal to the external diameter of this rotating disk.
Preferably, this location division is cylindrical housings, and the dead in line of the axis of this location division and this rotating disk.
Preferably, the bottom surface of this disk is provided with a pressing plate, and the lower surface of this pressing plate is positioned at the top of the lower surface of this location division, and this pressing plate is installed with on the end face of this rotating disk.
In this programme, the setting of pressing plate can determine that gear rope device and rotating disk locate failure-free simultaneously, avoids producing between gear rope device and the upper surface of rotating disk rubbing.
On the basis meeting this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains the preferred embodiments of the invention.
Positive progressive effect of the present invention is:
Present invention, avoiding steel rope to move up and down under drive is driven on top or the inwall of double swerve rotating disk easy to wear under the action of the forces of the wind, add the service life of rotating disk.
Accompanying drawing explanation
Fig. 1 is the structural representation of the gear rope device of present pre-ferred embodiments.
Fig. 2 is the birds-eye view corresponding with figure.
Fig. 3 and the using state structural representation keeping off device of restricting.
Fig. 4 is the another location structural representation of the using state of gear rope device.
Description of reference numerals:
First shackle: 1
First steel rope: 2
Second shackle: 3
Chain: 4
Second steel rope: 5
3rd shackle: 6
Gear rope device: 7
Support portion: 71 disks: 711 stay bearing plates: 712
Pressing plate: 713
Location division: 72
Gear rope portion: 73 adapter plates: 731 boss: 732
Pulley body: 733 sheave shafts: 734
Detailed description of the invention
Lift preferred embodiment below, and come by reference to the accompanying drawings clearlyer intactly the present invention to be described.
In describing the invention, it will be appreciated that, term " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
The invention provides a kind of gear rope device 7 of the load test apparatus for jack-up platform cantilever beam, wherein, this jack-up platform comprises the rig floor and being located at cantilever beam top and is located at rotating disk on rig floor, and the top that load test apparatus comprises the top being located at rig floor is driven and barge.Please understood according to Fig. 3,4, this top is driven and is connected with barge by 5, eight the 3rd shackles 6 of two the first shackles, 1, two first steel ropes, 2, four the second shackles, 3, four second steel ropes.Simultaneously, the peristome of two the first shackles 1 is connected to top and drives, the hook portion of two the first shackles 1 is all through there being this first steel rope 2, the two ends of each the first steel rope 2 are connected to corresponding and in the hook portion of the second shackle 3, through there being second steel rope 5 on the peristome of each second shackle 3, the two ends of every root second steel rope 5 are connected in the 3rd shackle 6, and each 3rd shackle 6 is all connected on barge, and every root first steel rope 2 is all through the endoporus of this rotating disk.
In the present embodiment, the first steel rope 2 is the steel rope of the annular jointless form of diameter 144mm, and its girth is 97.6m, and the weight of every root first steel rope 2 reaches 6 tons.In test under load, this first steel rope 2 wants doubling to use, and being namely equivalent to eight diameters is the steel rope of 144mm, is the gear rope device 7 of 1.1m through diameter.Weight on rig floor is used to be that the winch of 10 tons coordinates top to drive, be that first steel rope 2 doubling of 144mm is through first shackle 1 of 500 tons diameter, play furred ceiling to drive, make the first steel rope 2 through gear rope device 7, above the barge that first steel rope 2 is stopped bottom below platform, be that second steel rope 5 of 96mm is connected on the first steel rope 2 that diameter is 144mm by second shackle 3 of 300 tons diameter, and the other end that diameter is second steel rope 5 of 96mm is connected with barge by 200 ton of the 3rd shackle 6.Meanwhile, four the second shackles 3 bundle formation one integral structure by a chain 4.
Please understood according to Fig. 1-2, this gear rope device 7 comprises support portion 71, location division 72 and gear rope portion 73.Wherein, this support portion 71 comprises a disk 711, and the periphery wall of disk 711 is provided with three pieces of stay bearing plates 712, and those stay bearing plates 712 stretch out and circumferential uniform intervals along disk 711 is arranged, meanwhile, those stay bearing plates 712 are connected on rig floor by bolt is detachable.Can guarantee that gear rope device 7 can not produce relative motion with rotating disk on the axis direction of rotating disk like this, meanwhile, avoid the upper surface producing a friction force and this rotating disk that weares and teares between the lower surface of support portion 71 and the upper surface of rotating disk.
In the present embodiment, respectively the thickness of this stay bearing plate 712 is all equal with the thickness of this disk 711.Meanwhile, the axis of disk 711 and the dead in line of rotating disk, and the external diameter of disk 711 is more than or equal to the external diameter of rotating disk.
In addition, on the inwall that location division 72 is arranged on disk 711 and vertically to downward-extension, meanwhile, the bottom of location division 72 is fastened on the inwall of rotating disk, those first steel ropes 2 can pass this location division 72.Can guarantee that this gear rope device 7 can not produce relative movement with rotating disk perpendicular on the axis direction of rotating disk like this, guarantee that gear rope device 7 is to the limit effect of the first steel rope 2.In the present embodiment, this location division 72 is cylindrical housings, and the axis of location division 72 and the dead in line of rotating disk.
In addition, the bottom surface of this disk 711 is provided with a pressing plate 713, and the lower surface of this pressing plate 713 is positioned at the top of the lower surface of location division 72, and pressing plate 713 is installed with on the end face of rotating disk.Can determine that gear rope device 7 locates failure-free simultaneously with rotating disk like this, avoid producing between gear rope device 7 and the upper surface of rotating disk rubbing.
As shown in Figure 1-2, on this detachable end face being connected to this disk 711 in gear rope portion 73, and rock with the inwall of restriction the first steel rope 2 to rotating disk for tightening the first steel rope 2.Wherein, the effect of gathering is played in gear rope portion 73 to the first steel rope 2, the first steel rope 2 can be avoided to move up and down under drive is driven on top or the inwall of double swerve rotating disk easy to wear under the action of the forces of the wind, add the service life of rotating disk.
In addition, this gear rope portion 73 comprises six fixed pulleys and the support that arrange corresponding to each fixed pulley, and each support comprises one is detachablely connected to adapter plate 731 on disk 711 and two and is arranged at intervals at boss 732, two boss 732 on adapter plate 731 and upwards extends along the upper surface of adapter plate 731.Each fixed pulley comprises one for the pulley body 733 of spacing this first steel rope 2 corresponding and sheave shaft 734, sheave shaft 734 is fixed on corresponding two boss 732, this pulley body 733 is sheathed on sheave shaft 734, and pulley body 733 is between two these boss 732.
In the present embodiment, adopt the gear rope device 7 of said structure, first steel rope 2 is contacted with the pulley body 733 of fixed pulley in left and right, upper and lower sliding process, reduce the friction force to the first steel rope 2, thus avoid the first steel rope 2 and be subject to larger wearing and tearing and rupture, improve the safety of test under load; Meanwhile, pulley body 733 limits the movement of the first steel rope 2 towards rotating disk inwall direction, avoids the first steel rope 2 to move up and down under drive is driven on top or the inwall of double swerve rotating disk easy to wear under the action of the forces of the wind, adds the service life of rotating disk.
Wherein, those fixed pulleys are arranged around the direction uniform intervals that the axis of this disk 711 rotates.Not only increase bulk strength and the stability of this gear rope device 7 like this, improve the limit effect of fixed pulley to the first steel rope 2 simultaneously.Meanwhile, pulley body 733 is circular arc cylinder, makes, while the friction force of reduction first steel rope 2 and pulley body 733, to improve the limit effect of pulley body 733 to the first steel rope 2.
Further, on a horizontal surface of the axis perpendicular to disk 711, each pulley body 733 overlaps near the center of circle of the circular arc of disk 711 axis, and those circular arcs form a pulley circle, this pulley circle diameter is less than the internal diameter of this rotating disk, and the center of circle of this pulley circle is positioned on the axis of rotating disk.The first steel rope 2 can be avoided so completely in the process of rocking with the contact internal walls of rotating disk and the rotating disk that weares and teares.And respectively the central angle of this circular arc is 56 °, can ensure to carry out spacing to the first steel rope 2 in whole pulley circle region.
In sum, present invention, avoiding the first steel rope 2 and move up and down under drive is driven on top or the inwall of double swerve rotating disk easy to wear under the action of the forces of the wind, add the service life of rotating disk.
Although the foregoing describe the specific embodiment of the present invention, it will be understood by those of skill in the art that this is only casehistory, protection scope of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can make various changes or modifications to these embodiments, but these change and amendment all falls into protection scope of the present invention.
Claims (10)
1. the gear rope device for the load test apparatus of jack-up platform cantilever beam, this jack-up platform comprises the rig floor and being located at this cantilever beam top and is located at rotating disk on this rig floor, this load test apparatus comprises the steel rope of some endoporus through this rotating disk, it is characterized in that, this gear rope device comprises a support portion, one location division and a gear rope portion, this support portion comprises a disk, the periphery wall of this disk is provided with at least two stay bearing plates, those stay bearing plates stretch out and circumferential uniform intervals along this disk is arranged, those stay bearing plates are detachable to be connected on this rig floor,
On the inwall that this location division is arranged at this disk and vertically to downward-extension, the bottom of this location division is arranged on the inwall of this rotating disk, this location division of those steel wire penetrating;
Gear rope portion is detachable is connected on the end face of this disk for this, and rocks for lacing wires rope and the restriction steel rope inwall to this rotating disk.
2. gear rope device as claimed in claim 1, it is characterized in that, this gear rope portion comprise some fixed pulleys and with each corresponding support arranged of this fixed pulley, respectively this support comprises one and is detachablely connected to adapter plate on this disk and two boss be arranged at intervals on this adapter plate, and two these boss upwards extend along the upper surface of this adapter plate;
Respectively this fixed pulley comprises one for the pulley body of spacing this steel rope corresponding and sheave shaft, and this sheave shaft is fixed on corresponding two these boss, and this pulley body is sheathed on this sheave shaft, and this pulley body is between two these boss.
3. gear rope device as claimed in claim 2, is characterized in that, the direction uniform intervals setting that those fixed pulleys rotate around the axis of this disk.
4. gear rope device as claimed in claim 3, it is characterized in that, the quantity of this fixed pulley is six, and respectively this pulley body is circular arc cylinder.
5. gear rope device as claimed in claim 4, it is characterized in that, on a horizontal surface of the axis perpendicular to this disk, respectively this pulley body overlaps near the center of circle of the circular arc of this disk axis, and those circular arcs form a pulley circle, this pulley circle diameter is less than the internal diameter of this rotating disk, and the center of circle of this pulley circle is positioned on the axis of this rotating disk.
6. gear rope device as claimed in claim 5, it is characterized in that, respectively the central angle of this circular arc is 56 °.
7. gear rope device as claimed in claim 1, it is characterized in that, respectively the thickness of this stay bearing plate is all equal with the thickness of this disk.
8. gear rope device as claimed in claim 1, it is characterized in that, the dead in line of the axis of this disk and this rotating disk, and the external diameter of this disk is more than or equal to the external diameter of this rotating disk.
9. as the gear rope device in claim 1-8 as described in any one, it is characterized in that, this location division is cylindrical housings, and the dead in line of the axis of this location division and this rotating disk.
10. as the gear rope device in claim 1-8 as described in any one, it is characterized in that, the bottom surface of this disk is provided with a pressing plate, and the lower surface of this pressing plate is positioned at the top of the lower surface of this location division, and this pressing plate is installed with on the end face of this rotating disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410487221.6A CN104310217B (en) | 2014-09-22 | 2014-09-22 | Gear rope device for the load test apparatus of jack-up unit cantilever beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410487221.6A CN104310217B (en) | 2014-09-22 | 2014-09-22 | Gear rope device for the load test apparatus of jack-up unit cantilever beam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104310217A true CN104310217A (en) | 2015-01-28 |
| CN104310217B CN104310217B (en) | 2016-08-24 |
Family
ID=52365575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410487221.6A Expired - Fee Related CN104310217B (en) | 2014-09-22 | 2014-09-22 | Gear rope device for the load test apparatus of jack-up unit cantilever beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104310217B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105464064A (en) * | 2016-01-11 | 2016-04-06 | 南通振华重型装备制造有限公司 | System and method for cantilever beam heavy-duty test of self-elevating drilling platform |
| CN111416474A (en) * | 2018-12-18 | 2020-07-14 | 日本电产三协株式会社 | Driving device for drain valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3214343A1 (en) * | 1982-04-19 | 1983-10-27 | Heinrich Blickle GmbH u. Co KG, 7463 Rosenfeld | Rope pulley |
| CN201165452Y (en) * | 2007-12-07 | 2008-12-17 | 中国石化集团胜利石油管理局渤海钻井总公司 | Novel overhead traveling crane anti-groove jumping rope stopping device |
| CN201325845Y (en) * | 2008-12-29 | 2009-10-14 | 北京星光影视设备科技股份有限公司 | Portable steering single machine suspension point |
| CN202544788U (en) * | 2012-04-01 | 2012-11-21 | 中国石油化工股份有限公司 | Elastic rope retainer |
| CN202729681U (en) * | 2012-07-20 | 2013-02-13 | 中国石油化工股份有限公司 | Winch rope guider of well drilling rope |
-
2014
- 2014-09-22 CN CN201410487221.6A patent/CN104310217B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3214343A1 (en) * | 1982-04-19 | 1983-10-27 | Heinrich Blickle GmbH u. Co KG, 7463 Rosenfeld | Rope pulley |
| CN201165452Y (en) * | 2007-12-07 | 2008-12-17 | 中国石化集团胜利石油管理局渤海钻井总公司 | Novel overhead traveling crane anti-groove jumping rope stopping device |
| CN201325845Y (en) * | 2008-12-29 | 2009-10-14 | 北京星光影视设备科技股份有限公司 | Portable steering single machine suspension point |
| CN202544788U (en) * | 2012-04-01 | 2012-11-21 | 中国石油化工股份有限公司 | Elastic rope retainer |
| CN202729681U (en) * | 2012-07-20 | 2013-02-13 | 中国石油化工股份有限公司 | Winch rope guider of well drilling rope |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105464064A (en) * | 2016-01-11 | 2016-04-06 | 南通振华重型装备制造有限公司 | System and method for cantilever beam heavy-duty test of self-elevating drilling platform |
| CN105464064B (en) * | 2016-01-11 | 2017-06-23 | 南通振华重型装备制造有限公司 | A kind of self-elevating drilling platform cantilever beam heavy-duty test system and method |
| CN111416474A (en) * | 2018-12-18 | 2020-07-14 | 日本电产三协株式会社 | Driving device for drain valve |
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| Publication number | Publication date |
|---|---|
| CN104310217B (en) | 2016-08-24 |
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