CN105922181A - Round nut tightening device - Google Patents
Round nut tightening device Download PDFInfo
- Publication number
- CN105922181A CN105922181A CN201610432497.3A CN201610432497A CN105922181A CN 105922181 A CN105922181 A CN 105922181A CN 201610432497 A CN201610432497 A CN 201610432497A CN 105922181 A CN105922181 A CN 105922181A
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- gear
- round nut
- sun gear
- chuck
- screwing
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- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 210000000078 claw Anatomy 0.000 abstract 3
- 230000008859 change Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000019771 cognition Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B17/00—Hand-driven gear-operated wrenches or screwdrivers
- B25B17/02—Hand-driven gear-operated wrenches or screwdrivers providing for torque amplification
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Retarders (AREA)
Abstract
The invention discloses a round nut tightening device. The round nut tightening device comprises an input mechanism and a tightening mechanism. The tightening mechanism comprises a second planetary gear, a key chuck and a claw chuck; the second planetary gear comprises a second sun wheel, an inner tooth ring and a second planetary gear; the second sun wheel and the inner tooth ring are both engaged with the second planetary gear; the key chuck and a gear shaft of the second planetary gear are fixed relatively; the inner tooth ring and the claw chuck are fixed relatively; the output of the input mechanism is in driving connection with the second sun wheel; the key chuck, the claw chuck and the second sun wheel are all coaxially arranged and can rotate relative to one another. According to the round nut tightening device, the second planetary gear is used for transmission of tightening torque, and the output torque is changed; and smaller torque can be input for obtaining larger output torque, and the effective tightening of a round nut with a large torque requirement on the condition of smaller torque input can be achieved.
Description
Technical field
The present invention relates to mechanical field, particularly to the device for screwing up of a kind of round nut.
Background technology
Driftage, variable paddle speed reducer have a wide range of applications in wind-powered electricity generation field due to the construction features of its excellence.Being provided with a pair axial arranged taper roll bearing in wind power yawing, variable paddle speed reducer lower body, be used for supporting exposed gear, this exposed gear bears alternate load in actual use, therefore taper roll bearing bears certain radial load and axial load.A taper roll bearing axial end is disposed with round nut and stop washer wherein, is fixed on exposed gear axle by this round nut by the moment of regulation, in order to realize the axial location of taper roll bearing.Generally, this round nut Tightening moment reaches 4000Nm, for ensureing reliable installation, use specialty torque spanner to fasten, but this kind of torque spanner is expensive, reaches about 100,000 yuan, and different types of decelerator need to use the torque spanner of different size, versatility is poor.The method of torque spanner and impact as used small dimension reaches above-mentioned regulation moment, and in installation process, reducing gearbox cognition rotates, it is impossible to realize effectively installing.For solving the problems referred to above, this patent proposes a kind of novel round nut and installs device for screwing up, common torque spanner can be used to be issued to the regulation Tightening moment of round nut at less input torque (300Nm), and the erection joint of this device is replaceable, the fixed installation of different size round nut can be realized.
In view of this, the special proposition present invention.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, a kind of round nut device for screwing up is provided, it is particularly suited for the installation fastening of wind power yawing, variable paddle speed reducer exposed gear taper roll bearing axial setting circle nut, solves prior art and lack device for screwing up and the shortcoming of torque spanner universality deficiency.
For solving above-mentioned technical problem, the present invention uses the basic conception of technical scheme to be:
A kind of round nut device for screwing up, including input mechanism and tightening mechanism；Described tightening mechanism includes the second planetary gear, key chuck and dog chuck；
Described second planetary gear includes the second sun gear, ring gear and the second planetary gear；
Described second sun gear and ring gear all engage with described second planetary gear；
Described key chuck is relatively fixed with the wheel shaft of described second planetary gear；Described ring gear is relatively fixed with described dog chuck；
The output of described input mechanism and described second sun gear drive connection；
Described key chuck, described dog chuck and the second sun gear are all coaxially disposed and can relatively rotate between three.
Above-mentioned round nut device for screwing up, described input mechanism includes first planet gear and upper machine body；
Described first planet gear includes the first sun gear and the first row star-wheel；
Described upper machine body inwall is provided with the internal tooth engaged with described the first row star-wheel, and described first sun gear engages with described the first row star-wheel；The wheel shaft of described the first row star-wheel and described second sun gear drive connection；
Described second sun gear and the first sun gear are coaxially disposed and can relatively rotate；
It is provided with the groove for coordinating with spanner on described first sun gear；
Described upper machine body is relatively fixed with described key chuck.
Above-mentioned round nut device for screwing up, first planet gear also includes the first row carrier being connected with the wheel shaft of described the first row star-wheel；Described the first row carrier is coaxially disposed with described second sun gear and the two does not relatively rotates.
Above-mentioned round nut device for screwing up, also includes jacking block and ball block；Described jacking block and ball block are arranged between described the first row carrier and the first sun gear.
Above-mentioned round nut device for screwing up, described second planetary gear also includes the second planet carrier being connected with the wheel shaft of described second planetary gear；Described second planet carrier is also coaxially disposed with described key chuck and does not relatively rotates.
Above-mentioned round nut device for screwing up, for removably connecting between described second planet carrier and described key chuck；
And/or, for removably connecting between described dog chuck and described ring gear.
Above-mentioned round nut device for screwing up, also includes that body cover plate, described body cover plate are relatively fixed with described upper machine body；The axle section of described first sun gear stretches out described body cover plate, and described groove is arranged on the wheel shaft of described first sun gear and stretches out the part of described body cover plate.
Above-mentioned round nut device for screwing up, described body cover plate is above-mentioned is provided with blocking arm.
Above-mentioned round nut device for screwing up, also includes that lower body, described ring gear and described dog chuck realize being relatively fixed by described lower body.
Above-mentioned round nut device for screwing up, described the first row star-wheel is connected by bearing with its wheel shaft；
And/or, described second planetary gear is connected by bearing with its wheel shaft.
After using technique scheme, the present invention compared with prior art has the advantages that
1, Tightening moment is transmitted by second planetary gear that utilizes of round nut device for screwing up of the present invention, change output torque, bigger output moment of torsion can be obtained with the moment of torsion that input is less, under less moment of torsion input condition, realize effective fastening of the bigger round nut of torque demand；
2, inputted by first planet gear, further promote stability and the gear ratio of whole system of input torque, be advantageously implemented the guarantee to output moment of torsion；
3, by jacking block and ball block, the height of the first sun gear is adjusted, helps to ensure that height and the stability of the first sun gear；
4, dog chuck, key chuck with corresponding component in the present invention for removably connecting, it is simple to change so that this device has the bigger scope of application, has preferable universality；
5, groove provides moment handle and the abutment of the first sun gear, and blocking arm provides handle limit point, it is possible to prevents handle from excessively rotating and causes slide fastener etc. to pay no attention to situation；
6, this device the second Planetary Gear Transmission uses ring gear output and uses bearing between first and second planetary gear and planet axis, can effectively reduce the radial dimension of device for screwing up, compact conformation.
Accompanying drawing explanation
Fig. 1 is the structural representation of round nut device for screwing up of the present invention.
Fig. 2 is the use state diagram of round nut device for screwing up of the present invention.
In above-mentioned accompanying drawing, the 1, first sun gear；2, the first row carrier；3, the first row star-wheel；4, upper machine body；5, the second sun gear；6, the second planetary gear；7, ring gear；8, bolt a；9, lower body；10, the second planet carrier；11, bolt b；12, dog chuck；13, key chuck；14, bolt c；15, blocking arm；16, body cover plate；17, ball block；18, jacking block；19, bearing；20, groove；21, round nut；23, exposed gear；24, torque spanner.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment, the invention will be further described, to help understanding present disclosure.
As depicted in figs. 1 and 2, the invention provides a kind of round nut device for screwing up, including input mechanism and tightening mechanism；Described tightening mechanism includes the second planetary gear, key chuck 13 and dog chuck 12；Described second planetary gear includes the second sun gear 5, ring gear 7 and the second planetary gear 6；Described second sun gear 5 and ring gear 7 all engage with described second planetary gear 6；Described key chuck 13 is relatively fixed with the wheel shaft of described second planetary gear 6；Described ring gear 7 is relatively fixed with described dog chuck 12；The output of described input mechanism and described second sun gear 5 drive connection；Described key chuck 13, described dog chuck 12 and the second sun gear 5 are all coaxially disposed and can relatively rotate between three.
Input mechanism includes first planet gear and upper machine body 4；Described first planet gear includes the first sun gear 1 and the first row star-wheel 3；Described upper machine body 4 inwall is provided with the internal tooth engaged with described the first row star-wheel 3, and described first sun gear 1 engages with described the first row star-wheel 3；The wheel shaft of described the first row star-wheel 3 and described second sun gear 5 drive connection；Described second sun gear 5 and the first sun gear 1 are coaxially disposed and can relatively rotate；It is provided with the groove for coordinating with spanner on described first sun gear 1；Described upper machine body 4 is relatively fixed with described key chuck 13.First planet gear also includes the first row carrier 2 being connected with the wheel shaft of described the first row star-wheel 3；Described the first row carrier 2 is coaxially disposed with described second sun gear 5 and the two does not relatively rotates.Round nut device for screwing up in the present embodiment also includes jacking block 18 and ball block 17；Described jacking block 18 and ball block 17 are arranged between described the first row carrier 2 and the first sun gear 1.First sun gear 1 utilizes ball block 17 and jacking block 18 to realize axially positioning, and bearing 19 is installed between one-level sun gear 1 and body cover plate 16, for the circumference support of the first sun gear 1, helps to ensure that height and the stability of the first sun gear 1.Second planetary gear also includes the second planet carrier 10 being connected with the wheel shaft of described second planetary gear 6；Described second planet carrier 10 is also coaxially disposed with described key chuck 13 and does not relatively rotates.For removably connecting between described second planet carrier 10 and described key chuck 13；And/or, for removably connecting between described dog chuck 12 and described ring gear 7.So, it is simple to change key chuck 13 and/or dog chuck 12, add the scope of application of this device, there is preferable universality.Round nut device for screwing up in the present embodiment, also includes that body cover plate 16, described body cover plate 16 are relatively fixed with described upper machine body 4；The axle section of described first sun gear 1 stretches out described body cover plate 16, and described groove 20 is arranged on the wheel shaft of described first sun gear 1 and stretches out the part of described body cover plate 16.Described body cover plate 16 is above-mentioned is provided with blocking arm 15.Groove 20 and blocking arm 15 realize the fixing of torque spanner 24, and groove 20 provides moment handle and the abutment of the first sun gear 1, and blocking arm 15 provides handle limit point, it is possible to prevents handle from excessively rotating and causes slide fastener etc. to pay no attention to situation.The present embodiment also including, lower body 9, described ring gear 7 and described dog chuck 12 realize being relatively fixed by described lower body 9.So, lower body 9 increases axial distance first so that dog chuck 12 is more firm with coordinating of round nut 21, second to playing certain protective effect inside the second planetary gear.The first row star-wheel 3 is connected by bearing 19 with its wheel shaft；And/or, described second planetary gear 6 is connected by bearing 19 with its wheel shaft, can effectively reduce the radial dimension of device for screwing up, compact conformation.
In the present embodiment, dog chuck and key chuck are respectively chuck and spline chuck.
The operating principle of the present invention is as follows:
First planet gear input is the first sun gear 1.In rundown process, upper machine body the 4, second planet carrier 10, key chuck 13 maintain static, then first planet gear drive uses the first row carrier 2 to export.Second planet carrier 10 is fixed, then the second planetary gear 6 drives ring gear 7 to rotate, and ring gear 7, lower body 9, dog chuck 12 are with bolts (to be specifically connected as bolt a8 and connect lower body 9 and ring gear 7；Bolt b11 connects lower body 9 and dog chuck 12；Bolt c14 connects the second planet carrier 10 and key chuck 13), then screw-down torque is transferred to dog chuck 12 by ring gear 7, and the second planetary gear uses ring gear 7 to export.Due to bolts, split can assemble during assembling, improve efficiency.
Torque spanner 24 and the first sun gear 1 and blocking arm 15 coordinate, then form acting force arm between the first sun gear 1 and blocking arm 15；Dog chuck 12 coordinates with round nut 21, and the axle of key chuck 13 and exposed gear 23 coordinates, then form the retroaction arm of force between dog chuck 12 and key chuck 13；The output torque direction of dog chuck 12 and key chuck 13 is contrary, it is achieved tightening of round nut 21, and can be prevented effectively from the rotational problems of round nut 21 rundown process middle open type gear shaft.
In the present embodiment, the first sun gear 1 and the first row star-wheel 3 engage for gear, and the first sun gear 1 rotates under the effect of torque spanner 24, thus drives the first row star-wheel 3 to rotate.Upper machine body 4 is fixed by bolt and body cover plate 16, and is designed with internal spline inside upper machine body 4, and itself and the first row star-wheel 3 are meshed.Because upper machine body 4 and the second planet carrier 10 and key chuck 13 connect, therefore the first row star-wheel 3 rotates along upper machine body 4 internal spline under the first sun gear 1 drives, thus drives the first row carrier 2 to rotate.The first row carrier 2 is engaged by gear and the second sun gear 5, it is achieved the rotation of the second sun gear 5.The planet axis of the second planet carrier 10 and the second planetary gear 6 uses interference fit, and key chuck 13 is fixed by bolt c 14 and the second planet carrier 10, i.e. the wheel shaft of key chuck the 13, second planet carrier the 10, second planetary gear 6 is an entirety.Then, the second planetary gear 6 second sun gear 5 drive under around the second planetary gear 6 wheel shaft rotate.Key chuck 13 and exposed gear axle are by bonded, thus driving torque is transferred to exposed gear axle.
Ring gear 7 is fixed by bolt a8 and lower body 9, and lower body 9 and dog chuck 12 are fixed by bolt b11.Dog chuck 12 and round nut draw-in groove match, it is achieved fixing.Ring gear 7 is rotated by the second planetary gear 6, thus drives lower body 9 and dog chuck 12 to rotate, and meanwhile, driving torque is transferred to round nut by dog chuck 12, it is achieved tightening of round nut.
Those skilled in the art according to the actual requirements, can suitably distribute gear ratio at different levels, and this device gear ratio, up to 16-20, exports moment of torsion up to 4800-6000Nm, it is simple to realize tightening of round nut when input torque is 300Nm.
Tightening moment is transmitted by second planetary gear that utilizes of round nut device for screwing up of the present invention, change output torque, bigger output moment of torsion can be obtained with the moment of torsion that input is less, under less moment of torsion input condition, realize effective fastening of the bigger round nut of torque demand.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a round nut device for screwing up, it is characterised in that include input mechanism and tightening mechanism,
Described tightening mechanism includes the second planetary gear, key chuck (13) and dog chuck (12)；
Described second planetary gear includes the second sun gear (5), ring gear (7) and the second planetary gear (6)；
Described second sun gear (5) and ring gear (7) all engage with described second planetary gear (6)；
Described key chuck (13) is relatively fixed with the wheel shaft of described second planetary gear (6)；Described ring gear (7) is relatively fixed with described dog chuck (12)；
The output of described input mechanism and described second sun gear (5) drive connection；
Described key chuck (13), described dog chuck (12) and the second sun gear (5) are all coaxially disposed and can relatively rotate between three.
Round nut device for screwing up the most according to claim 1, it is characterised in that described input mechanism includes first planet gear and upper machine body (4)；
Described first planet gear includes the first sun gear (1) and the first row star-wheel (3)；
Described upper machine body (4) inwall is provided with the internal tooth engaged with described the first row star-wheel (3), and described first sun gear (1) is engaged with described the first row star-wheel (3)；The wheel shaft of described the first row star-wheel (3) and described second sun gear (5) drive connection；
Described second sun gear (5) and the first sun gear (1) are coaxially disposed and can relatively rotate；
The groove (20) for coordinating it is provided with spanner on described first sun gear (1)；
Described upper machine body (4) is relatively fixed with described key chuck (13).
Round nut device for screwing up the most according to claim 2, it is characterised in that first planet gear also includes the first row carrier (2) being connected with the wheel shaft of described the first row star-wheel (3)；Described the first row carrier (2) is coaxially disposed with described second sun gear (5) and the two does not relatively rotates.
Round nut device for screwing up the most according to claim 3, it is characterised in that also include jacking block and ball block；Described jacking block and ball block are arranged between described the first row carrier (2) and the first sun gear (1).
Round nut device for screwing up the most according to claim 2, it is characterised in that described second planetary gear also includes the second planet carrier (10) being connected with the wheel shaft of described second planetary gear (6)；Described second planet carrier (10) is also coaxially disposed with described key chuck (13) and does not relatively rotates.
Round nut device for screwing up the most according to claim 5, it is characterised in that for removably connecting between described second planet carrier (10) and described key chuck (13)；
And/or, for removably connecting between described dog chuck (12) and described ring gear.
Round nut device for screwing up the most according to claim 2, it is characterised in that also include that body cover plate (16), described body cover plate (16) are relatively fixed with described upper machine body (4)；The axle section of described first sun gear (1) stretches out described body cover plate (16), and described groove (20) is arranged on the wheel shaft of described first sun gear (1) and stretches out the part of described body cover plate (16).
Round nut device for screwing up the most according to claim 7, it is characterised in that described body cover plate is above-mentioned is provided with blocking arm.
Round nut device for screwing up the most according to claim 1, it is characterised in that also include that lower body (9), described ring gear (7) and described dog chuck (12) realize being relatively fixed by described lower body (9).
10. according to the arbitrary described round nut device for screwing up of claim 2-9, it is characterised in that described the first row star-wheel is connected by bearing with its wheel shaft；
And/or, described second planetary gear is connected by bearing with its wheel shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610432497.3A CN105922181B (en) | 2016-06-17 | 2016-06-17 | A kind of device for screwing up of round nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610432497.3A CN105922181B (en) | 2016-06-17 | 2016-06-17 | A kind of device for screwing up of round nut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105922181A true CN105922181A (en) | 2016-09-07 |
| CN105922181B CN105922181B (en) | 2018-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610432497.3A Active CN105922181B (en) | 2016-06-17 | 2016-06-17 | A kind of device for screwing up of round nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105922181B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517055A (en) * | 2016-12-01 | 2017-03-22 | 上海电机学院 | Multifunctional bottle opener |
| CN111872883A (en) * | 2020-07-27 | 2020-11-03 | 银川威力传动技术股份有限公司 | Quick replacement device of round nut tightening machine |
| CN112571354A (en) * | 2020-12-09 | 2021-03-30 | 东风汽车集团有限公司 | Planetary gear telescopic wheel bolt dismounting and mounting tool |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1155345A (en) * | 1966-08-10 | 1969-06-18 | Paul Heinz Wagner | Improvements in Wrenches. |
| US5123308A (en) * | 1990-10-05 | 1992-06-23 | Consulier Engineering, Inc. | Torque multiplying lug nut wrench |
| CN2216894Y (en) * | 1994-12-30 | 1996-01-10 | 郇红喜 | Device for providing torque amplification |
| CN2688450Y (en) * | 2004-05-21 | 2005-03-30 | 王树清 | Power-saving spanner for vehicle |
| CN205799342U (en) * | 2016-06-17 | 2016-12-14 | 银川威力减速器有限公司 | A kind of round nut device for screwing up |
-
2016
- 2016-06-17 CN CN201610432497.3A patent/CN105922181B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1155345A (en) * | 1966-08-10 | 1969-06-18 | Paul Heinz Wagner | Improvements in Wrenches. |
| US5123308A (en) * | 1990-10-05 | 1992-06-23 | Consulier Engineering, Inc. | Torque multiplying lug nut wrench |
| CN2216894Y (en) * | 1994-12-30 | 1996-01-10 | 郇红喜 | Device for providing torque amplification |
| CN2688450Y (en) * | 2004-05-21 | 2005-03-30 | 王树清 | Power-saving spanner for vehicle |
| CN205799342U (en) * | 2016-06-17 | 2016-12-14 | 银川威力减速器有限公司 | A kind of round nut device for screwing up |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517055A (en) * | 2016-12-01 | 2017-03-22 | 上海电机学院 | Multifunctional bottle opener |
| CN106517055B (en) * | 2016-12-01 | 2018-11-20 | 上海电机学院 | A kind of Multifunction cork-screw |
| CN111872883A (en) * | 2020-07-27 | 2020-11-03 | 银川威力传动技术股份有限公司 | Quick replacement device of round nut tightening machine |
| CN112571354A (en) * | 2020-12-09 | 2021-03-30 | 东风汽车集团有限公司 | Planetary gear telescopic wheel bolt dismounting and mounting tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105922181B (en) | 2018-12-28 |
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Address after: 750002 the Ningxia Hui Autonomous Region high tech Zone, Yinchuan, No. 1 plant room, room 406 Applicant after: Yinchuan Weili Reducer Machinery Co., Ltd. Address before: 750011 the Ningxia Hui Autonomous Region Jinfeng Industrial Park, the new open street, No. 128, No. Applicant before: Yinchuan Weili Reducer Machinery Co., Ltd. |
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Inventor after: Li Abo Inventor after: Li Xiang Inventor after: Jin Wei Inventor before: Jin Wei Inventor before: Ma Haibo Inventor before: Ma Xi Inventor before: Liu Xilong Inventor before: Ma Wenguang |
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Denomination of invention: Round nut tightening device Effective date of registration: 20190719 Granted publication date: 20181228 Pledgee: Yinchuan SME Credit Guarantee Center Pledgor: Yinchuan power transmission technology Limited by Share Ltd Registration number: 2019990000738 |
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Date of cancellation: 20201210 Granted publication date: 20181228 Pledgee: Yinchuan SME Financing Guarantee Co.,Ltd. Pledgor: YINCHUAN WEILI TRANSMISSION TECHNOLOGY Co.,Ltd. Registration number: 2019990000738 |
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Change date: 20201209 Registration number: 2019990000738 Pledgee after: Yinchuan SME Financing Guarantee Co.,Ltd. Pledgee before: Yinchuan SME Credit Guarantee Center |
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