CN106476765A - A kind of Universal base tread sweeping device - Google Patents
A kind of Universal base tread sweeping device Download PDFInfo
- Publication number
- CN106476765A CN106476765A CN201611122617.6A CN201611122617A CN106476765A CN 106476765 A CN106476765 A CN 106476765A CN 201611122617 A CN201611122617 A CN 201611122617A CN 106476765 A CN106476765 A CN 106476765A
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- hole
- hinge pin
- pin hole
- base
- toothed edge
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- 238000010408 sweeping Methods 0.000 title claims abstract description 28
- 150000001875 compounds Chemical group 0.000 claims abstract description 20
- 238000009434 installation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/62—Other vehicle fittings for cleaning
- B60S1/66—Other vehicle fittings for cleaning for cleaning vehicle exterior
- B60S1/68—Other vehicle fittings for cleaning for cleaning vehicle exterior for freeing wheels or tyres from foreign matter, e.g. wheel scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C15/00—Maintaining or augmenting the starting or braking power by auxiliary devices and measures; Preventing wheel slippage; Controlling distribution of tractive effort between driving wheels
- B61C15/08—Preventing wheel slippage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Tires In General (AREA)
Abstract
The present invention relates to a kind of Universal base tread sweeping device, belong to technical field of vehicle.This device body has grinding block built with piston rod, piston rod overhanging end by grinding block support；Base has hinge pin hole, dowel hole, and toothed edge arcuate groove；Body bottom portion has hinge hole, pin shaft hole, and curved groove；Plug-in mounting centring pin may be selected in hinge pin hole and hinge hole and dowel hole；Each sawtooth of toothed edge is respectively provided with 2 θ minute of angle relative to hinge pin hole, loads compound bearing pin in toothed edge arcuate groove；The width of curved groove is matched with centring pin diameter and centrage is the curve being determined by equation group.Each sawtooth of toothed edge of the present invention has 2 θ minute of angle relative to hinge pin hole, and therefore each tooth has enough rigidity and intensity, can ensure that positioning security is reliable；And the compensating action by curved groove, angular adjustment precision can be made to be θ；It is θ and safe and reliable requirement that result meets various inclination angles installation accuracy.
Description
Technical field
The present invention relates to a kind of tread sweeping device, especially a kind of realize wheel tread is cleaned, correction of the flank shape and thickening
Universal base tread sweeping device, belongs to technical field of vehicle.
Background technology
With rail traffic vehicles towards at a high speed, heavily loaded, many complex environments direction develop, for improving wheel table planar
Condition, prevent skid lead to damage and can efficiently revise wheel pedal, avoid wheel produce polygonal tread sweeping device by
Step becomes the standard configuration of rail traffic vehicles Disc brake systems.The typical structure such as application number of existing tread sweeping device
200720046475.X Chinese patent open, the cylinder body of its tubulose（Also known as body）Built with the piston rod tending to retraction, should
The overhanging end of piston rod has grinding block by grinding block support, piston rod is formed with the chute extending along its length, on cylinder body
Equipped with the guide and limit part stretching into chute and constituting therewith moving sets, therefore can Pneumatic extension on demand, complete and wheel tread
Contact cleans；Additionally, the groove being become predetermined angular position setting-in to transfer the files tooth bar with chute is also formed with piston rod, on cylinder body equipped with
Tending to the latch engaging with teeth groove, thus constituting gap adjusting mechanism, being altered as desired the engaged gear of latch and tooth bar, you can be real
Show the adjustment of brake shoe and wheel tread gap, the gap that supplement leads to because of abrasion between the two is overproof.
Train bogie species due to disposing tread sweeping device is various, and installation site is different, and different bogies are to step on
The installation site that face clearing apparatus is reserved is different, therefore different to the setting angle and conditions dictate of tread sweeping device.
Fig. 1, Fig. 2 are respectively the different typical tread sweeping device of existing two kinds of setting angles, and body 2 top on base 1 has interior
The tubular cylinder of dress piston rod, the overhanging end of piston rod passes through grinding block support 4 equipped with grinding block 3.Although its main part is permissible
General, but because base angle difference is it is therefore desirable to separately designing, manufacturing body, and body is foundry goods, need to re-mold, consumption
When laborious, extend the R＆D cycle.
Content of the invention
It is an object of the invention to：Improved by structure, propose one kind can meet various inclination angles installation accuracy be θ and
Safe and reliable Universal base tread sweeping device, so that it is adapted to mount on the bogie of various trains.
In order to reach above primary and foremost purpose, the Universal base tread sweeping device of the present invention includes bottom and is supported on base
Body, the top of described body has a tubular cylinder of built-in piston rod, and the overhanging end of described piston rod passes through grinding block support
Equipped with grinding block；Described base have hinge pin hole, be located at hinge pin hole side dowel hole, and be located at hinge pin hole opposite side and
Toothed edge arcuate groove with hinge pin hole as the center of circle；Described body bottom portion has hinge hole corresponding with hinge pin hole site and sawtooth
The corresponding pin shaft hole of side arc groove location, and curved groove corresponding with dowel hole position；Described hinge pin hole and hinge hole, with
And plug-in mounting centring pin in dowel hole, may be selected；Each sawtooth of described toothed edge is respectively provided with 2 θ minute of angle, institute relative to hinge pin hole
State to load in toothed edge arcuate groove and have with pin shaft hole matching cylinder section and match the compound of odd-shaped cross section section composition with sawtooth
Bearing pin；The width of described curved groove is matched with centring pin diameter and centrage is the curve being determined by equation below group：
； ①
； ②
； ③
④
In equation：
θ meets the base minimum angle adjustable of predetermined adjustment required precision（May be configured as positive count value in theory）；
B ' C base around hinge pin hole rotation β angle when, the length of dowel hole and pin shaft hole circle center line connecting；
L hinge pin hole and the distance of dowel hole；
R hinge pin hole to toothed edge arc groove center line distance；
β base, around the anglec of rotation in hinge pin hole, is set as the multiple of 2 θ；
α base around hinge pin hole rotation β angle when, the angle of dowel hole and pin shaft hole circle center line connecting and abscissa；
xB”Abscissa with hinge pin hole as initial point；
yB”Vertical coordinate with hinge pin hole as initial point；
B " C base around hinge pin hole rotation β angle when, dowel hole and pin shaft hole circle center line connecting are around pin shaft hole rotate counterclockwise θ
Position afterwards.
So, when needing to carry out β（2 θ multiples）During angle adjustment, centring pin is inserted in hinge pin hole and hinge hole, and with
It relatively rotates body and base for the center of circle, then the cylindrical section insertion pin shaft hole of compound bearing pin, odd-shaped cross section section are snapped in sawtooth
In the sawtooth breach of side arcuate groove right position, then lock.When needing to carry out β-θ（Angular adjustment precision is θ）During angle adjustment,
First carry out above step and be adjusted to immediate β Angle Position bigger than normal, then extract centring pin, be slightly reverse for the center of circle with compound bearing pin
Rotating base, centring pin is passed through in curved groove insertion dowel hole, because the curve characteristic of curved groove is it is ensured that reversely turn
Dynamic angle is θ, thus angle adjustment needed for realizing.It is appreciated that each sawtooth of toothed edge of the present invention has 2 relative to hinge pin hole
θ minute of angle, therefore each tooth has enough rigidity and intensity, can ensure that positioning security is reliable；And the compensation by curved groove is made
With angular adjustment precision can be made to be θ；It is θ and safe and reliable requirement that result meets various inclination angles installation accuracy.
The present invention further improves and includes：
Described dowel hole is isometrical with hinge pin hole；
Described hinge hole is isometrical with hinge pin hole；
The forward and backward bearing clamping plate matching with bearing thickness is extended in the bottom of described body；
Forward and backward two clamping plate matching with bearing thickness are extended in the bottom of described body；
Support plate is extended in the bottom of described body；
The middle preset space with body bottom portion forward and backward bearing clamping plate that described base is extended by base plate and plate upper surface matches
Bearing constitute；
Described toothed edge arcuate groove both sides are triangle profile of tooth, and described compound bearing pin has diamond-shaped cross-section section；
Described toothed edge arcuate groove both sides are trapezoidal toothed, and described compound bearing pin has both sides trapezoidal convex cross section section；
Described toothed edge arcuate groove both sides arc profile of tooth, described compound bearing pin has both sides arc convex section.
Brief description
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 with Fig. 2 is respectively the different typical tread sweeping schematic device of existing two kinds of setting angles.
Fig. 3 is the structural representation of the embodiment of the present invention one.
Fig. 4 is the body bottom portion structural representation of the embodiment of the present invention one.
Fig. 5 is the understructure schematic diagram of the embodiment of the present invention one.
Fig. 6 is the compound pin shaft structure schematic diagram of the embodiment of the present invention one.
Fig. 7 is the compound bearing pin mounting structure schematic diagram of the embodiment of the present invention one.
Fig. 8 is that the curved groove geometrical relationship of the embodiment of the present invention one exaggerates schematic diagram.
Fig. 9 is that the embodiment of the present invention one even number angle adjusts schematic diagram.
Figure 10 is that the embodiment of the present invention one odd number angle adjusts schematic diagram.
Specific embodiment
Embodiment one
The Universal base tread sweeping device basic structure of the present embodiment may refer to Fig. 3, is supported on base 1 including bottom
Body 2, the top of body 2 has the tubular cylinder of built-in piston rod, and the overhanging end of piston rod passes through grinding block support 4 equipped with grinding
Block 3.In the present embodiment taking 1 ° of base angular adjustment precision as a example, i.e. θ=1 °, then β is even number angle value, the reason of example convenient to carry out
Solution.
The concrete structure of base as shown in figure 4, the bearing 1-2 being extended by base plate 1-1 and plate upper surface is constituted, bearing
The hinge pin hole 1-J that the center of circle is A ' is had on 1-2, is located at L distance and the center of circle isometrical with hinge pin hole determining for B ' on the left of hinge pin hole
Position pin-and-hole 1-D, and be located at hinge pin hole opposite side and with hinge pin hole as the center of circle, the toothed edge arcuate groove 1-H as R for the radius.This saw
Tooth side arcuate groove 1-H is shown in Fig. 4 relative to the angular position size in hinge pin hole.
The forward and backward two clamping plate 2-1 matching with bearing 1-2 thickness are extended in the bottom of body 2, clamping plate have and hinge pin hole
The center of circle that 1-J position is corresponding and internal diameter is equal is the corresponding center of circle in hinge hole 2-J and toothed edge arcuate groove 1-H position of A is C
Pin shaft hole 2-H（The bearing pin aperture of front plate is more than rear plate）, and curved groove 2-D corresponding with dowel hole 1-D position.
Plug-in mounting centring pin may be selected in hinge pin hole 1-J and hinge hole 2-J and dowel hole 1-D.Toothed edge arcuate groove 1-
Each sawtooth of H both sides triangular tooth toothed edge is respectively provided with 2 ° of minute of angle relative to the hinge pin hole 1-J center of circle.In toothed edge arcuate groove
Load Fig. 6, Fig. 7 shown in structure compound bearing pin 5, this compound bearing pin 5 by respectively with large and small pin shaft hole phase on forward and backward two clamping plate
Large and small cylindrical section 5-1,5-1 joining ', and the diamond-shaped cross-section section matching with the sawtooth of toothed edge arcuate groove 1-H both sides toothed edge
5-2 is constituted.
The curve that the width of curved groove 2-D is matched with centring pin diameter and centrage is determined by equation below group：
；
；
；
In equation：
θ predetermined base angular adjustment precision, subsequently with 1 ° of example of value；
B ' C base around hinge pin hole rotation β angle when, the length of dowel hole and pin shaft hole circle center line connecting；
L hinge pin hole and the distance of dowel hole；
R hinge pin hole to toothed edge arc groove center line distance；
β base, around the anglec of rotation in hinge pin hole, is predefined for even number angle value；
α base around hinge pin hole rotation β angle when, the angle of dowel hole and pin shaft hole circle center line connecting and abscissa；
xB”Abscissa with hinge pin hole as initial point；
yB”Vertical coordinate with hinge pin hole as initial point；
B " C base around hinge pin hole rotation β angle when, dowel hole and pin shaft hole circle center line connecting are around pin shaft hole rotate counterclockwise θ
Position after=1 °.
Taking θ=1 ° as a example, now β is even number angle value, and β -1 ° is odd number angle value, the then derivation of above-mentioned equation group
Referring to Fig. 8：When base angle requirement is β -1 °, need by putting rotation β angle around hinge pin hole 1-J center of circle A ', after in place
Compound 1 ° of realization of bearing pin 5 center of circle C dot inversion.
In Fig. 8, solid line is base first around being inserted into the centring pin rotation β angle that A ' puts（Even number angle）Afterwards, hinge pin hole 1-J, fixed
Position pin-and-hole 1-D and the geometric position state of compound alignment pin.After in figure dotted line is the centring pin extracted out in the 1-J of hinge pin hole, bottom
Seat further around compound alignment pin center of circle C point rotate 1 ° after geometric position state, now base angle be β -1 °；This state lower bottom base
The position B ' ' of dowel hole 1-D should just para-position matches with the arcuate groove of body bottom portion, and therefore basis meets conditions above positioning
The track of pin-and-hole 1-D center of circle B ' ' can determine that the center curve of curved groove.
If base around hinge pin hole rotation β angle when, dowel hole and pin shaft hole circle center line connecting are α with the angle of abscissa, then
Can be obtained following various according to geometric knowledges such as the cosine laws：
；
；
；
The coordinate that B ' ' puts is：
；
According to current tread sweeping device pedestal angle use demand, base angle of regulation range is set as " -10 ° to+
30 ° ", then β is the even number angle value in -10 ° to+30 °, substitutes into this boundary condition, by above-mentioned various simultaneous solution, you can try to achieve
The movement locus that B ' ' puts.This track is the curve of tread sweeping device body arc groove center.The body processing accordingly with
Base engagement can achieve that the level that has that the minimum adjustment amount of base angle is 1 ° adjusts.
As shown in figure 9, being 2 ° when having level adjustment when needing to realize base angle least regulating amount, as long as centring pin is inserted
In hinge pin hole and hinge hole, and body and base, then the cylindrical section insertion pin by compound bearing pin are relatively rotated for the center of circle with it
Axis hole, diamond snap in the sawtooth breach of toothed edge arcuate groove right position, then lock.
As shown in Figure 10, when needing to carry out odd number angle adjustment, first carry out above step and be adjusted to immediate idol bigger than normal
Number Angle Position, then extract centring pin, rotating base is slightly reverse for the center of circle with compound bearing pin, centring pin is passed through curved groove to insert
In dowel hole, the curve characteristic of curved groove will ensure that counter-rotational angle is 1 °, thus realize required odd number angle adjusting
Whole.
The present embodiment is 1 ° using the base angle minimum adjustment amount that simple cleverly structure achieves tread sweeping device
（The different θ angular configurations of setting can achieve remaining arbitrarily minimum adjustment amount）Have level adjustable, tread not only can be greatly increased clear
Sweeping device and has enough to the adaptability of various bogies so as to have the versatility being sufficient for being actually needed
Rigidity and intensity, safe and reliable, easy to adjust, significantly reduce research and development and manufacture and maintenance cost.
In addition to the implementation, the present invention can also have other embodiment.For example, it is also possible to the bottom of body is extended
Support plate, and the forward and backward bearing clamping plate being matched with a plate thickness that base is extended by base plate and plate upper surface is constituted.For another example,
In addition to triangular tooth, toothed edge arcuate groove both sides can also be stepped tooth, arc-shaped gear, and compound bearing pin then removes as diamond-shaped cross-section section
Outward, can be to have that corresponding both sides are trapezoidal or the section of arc convex.All employing equivalents or equivalent transformation are formed
Technical scheme, all falls within the protection domain of application claims.
Claims (10)
1. a kind of Universal base tread sweeping device, is supported on the body on base including bottom, and the top of described body has
The tubular cylinder of built-in piston rod, the overhanging end of described piston rod has grinding block by grinding block support；It is characterized in that：Described
Base have hinge pin hole, be located at hinge pin hole side and the dowel hole isometrical with hinge pin hole, and be located at hinge pin hole opposite side and
Toothed edge arcuate groove with hinge pin hole as the center of circle；It is hinged that described body bottom portion has that and internal diameter corresponding with hinge pin hole site match
Hole pin shaft hole corresponding with toothed edge arc groove location, and curved groove corresponding with dowel hole position；Described hinge pin hole and
Plug-in mounting centring pin may be selected in hinge hole and dowel hole；Each sawtooth of described toothed edge is respectively provided with 2 θ relative to hinge pin hole
Minute of angle, is loaded in described toothed edge arcuate groove and has with pin shaft hole matching cylinder section and matched odd-shaped cross section section structure with sawtooth
The compound bearing pin becoming；The width of described curved groove is matched with centring pin diameter and centrage is the song being determined by equation below group
Line：
；
；
；
In equation：
θ meets the base minimum angle adjustable of predetermined adjustment required precision；
B ' C base around hinge pin hole rotation β angle when, the length of dowel hole and pin shaft hole circle center line connecting；
L hinge pin hole and the distance of dowel hole；
R hinge pin hole to toothed edge arc groove center line distance；
β base is around the anglec of rotation in hinge pin hole；
α base around hinge pin hole rotation β angle when, the angle of dowel hole and pin shaft hole circle center line connecting and abscissa；
xB”Abscissa with hinge pin hole as initial point；
yB”Vertical coordinate with hinge pin hole as initial point；
B " C base around hinge pin hole rotation β angle when, dowel hole and pin shaft hole circle center line connecting are around pin shaft hole rotate counterclockwise θ
Position afterwards.
2. Universal base tread sweeping device according to claim 1 it is characterised in that：Described dowel hole and hinge pin hole
Isometrical.
3. Universal base tread sweeping device according to claim 2 it is characterised in that：Described hinge hole and hinge pin hole etc.
Footpath.
4. Universal base tread sweeping device according to claim 3 it is characterised in that：Described base is by base plate and base plate
The bearing that upper surface extends is constituted.
5. Universal base tread sweeping device according to claim 4 it is characterised in that：The bottom of described body is extended
The forward and backward bearing clamping plate matching with bearing thickness.
6. Universal base tread sweeping device according to claim 3 it is characterised in that：The bottom of described body is extended
Support plate.
7. Universal base tread sweeping device according to claim 6 it is characterised in that：Described base is by base plate and base plate
The bearing that middle preset space matches with body bottom portion forward and backward bearing clamping plate that upper surface extends is constituted.
8. the Universal base tread sweeping device according to claim 5 or 7 it is characterised in that：Described toothed edge arcuate groove
Both sides are triangle profile of tooth, and described compound bearing pin has diamond-shaped cross-section section.
9. the Universal base tread sweeping device according to claim 5 or 7 it is characterised in that：Described toothed edge arcuate groove
Both sides are trapezoidal toothed, and described compound bearing pin has both sides trapezoidal convex cross section section.
10. the Universal base tread sweeping device according to claim 5 or 7 it is characterised in that：Described toothed edge arcuate groove
Both sides arc profile of tooth, described compound bearing pin has both sides arc convex section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611122617.6A CN106476765B (en) | 2016-12-08 | 2016-12-08 | A kind of Universal base tread sweeping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611122617.6A CN106476765B (en) | 2016-12-08 | 2016-12-08 | A kind of Universal base tread sweeping device |
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| Publication Number | Publication Date |
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| CN106476765A true CN106476765A (en) | 2017-03-08 |
| CN106476765B CN106476765B (en) | 2018-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611122617.6A Active CN106476765B (en) | 2016-12-08 | 2016-12-08 | A kind of Universal base tread sweeping device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112776756A (en) * | 2019-11-04 | 2021-05-11 | 常州中车铁马科技实业有限公司 | Tread sweeper with gap adjusting device |
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|---|---|---|---|---|
| GB2443480A (en) * | 2006-11-01 | 2008-05-07 | Mark Darren Shaw | Roller cleaning brush |
| CN201083243Y (en) * | 2007-09-25 | 2008-07-09 | 常州市铁马科技实业有限公司 | Tread sweeping device |
| CN202806783U (en) * | 2012-09-19 | 2013-03-20 | 常州南车铁马科技实业有限公司 | Tread cleaning device for rail transit |
| CN104494609A (en) * | 2014-12-18 | 2015-04-08 | 南车株洲电力机车有限公司 | Self-protection control device and self-protection control method for tread cleaner |
| CN206383938U (en) * | 2016-12-08 | 2017-08-08 | 常州中车铁马科技实业有限公司 | A kind of Universal base tread sweeping device |
-
2016
- 2016-12-08 CN CN201611122617.6A patent/CN106476765B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2443480A (en) * | 2006-11-01 | 2008-05-07 | Mark Darren Shaw | Roller cleaning brush |
| CN201083243Y (en) * | 2007-09-25 | 2008-07-09 | 常州市铁马科技实业有限公司 | Tread sweeping device |
| CN202806783U (en) * | 2012-09-19 | 2013-03-20 | 常州南车铁马科技实业有限公司 | Tread cleaning device for rail transit |
| CN104494609A (en) * | 2014-12-18 | 2015-04-08 | 南车株洲电力机车有限公司 | Self-protection control device and self-protection control method for tread cleaner |
| CN206383938U (en) * | 2016-12-08 | 2017-08-08 | 常州中车铁马科技实业有限公司 | A kind of Universal base tread sweeping device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112776756A (en) * | 2019-11-04 | 2021-05-11 | 常州中车铁马科技实业有限公司 | Tread sweeper with gap adjusting device |
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| CN106476765B (en) | 2018-09-21 |
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Address after: 213000 No.19 Shunyuan Road, Xuejia Town, Xinbei District, Changzhou City, Jiangsu Province Patentee after: CRRC CHANGZHOU TECH-MARK INDUSTRIAL Co.,Ltd. Country or region after: China Patentee after: CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co.,Ltd. Address before: 213000 No.19 Shunyuan Road, Xuejia Town, Xinbei District, Changzhou City, Jiangsu Province Patentee before: CRRC CHANGZHOU TECH-MARK INDUSTRIAL Co.,Ltd. Country or region before: China Patentee before: CRRC QISHUYAN INSTITUTE Co.,Ltd. |
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