CN104235303B - Operation gear-box - Google Patents
Operation gear-box Download PDFInfo
- Publication number
- CN104235303B CN104235303B CN201410448018.8A CN201410448018A CN104235303B CN 104235303 B CN104235303 B CN 104235303B CN 201410448018 A CN201410448018 A CN 201410448018A CN 104235303 B CN104235303 B CN 104235303B
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- CN
- China
- Prior art keywords
- gear
- rotating turret
- casing
- gearshift
- box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000003825 pressing Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
- F16H47/06—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type
- F16H47/08—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type the mechanical gearing being of the type with members having orbital motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2306/00—Shifting
- F16H2306/40—Shifting activities
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
- Gear Transmission (AREA)
Abstract
The invention discloses the operation gear-box of a kind of railway large-scale maintenance machinery, a kind of operation gear-box, including hydraulic motor, casing, driving gear shaft, driven gear, intermediate gear shaft, axle gear, it is right to take turns, gearshift and locking mechanism, planetary gear speed reducing mechanism is installed on casing, planetary gear speed reducing mechanism couples with driving gear shaft, the input of planetary gear speed reducing mechanism is bevel-gear sett auxiliary driving, hydraulic motor couples by bevel gear pair is vertical with planetary gear speed reducing mechanism, indication mechanism of shifting gears it is also equipped with on described casing, gearshift indication mechanism includes installing plate, sleeve, display axle, spring and pressing plate.Speed ratio of the present invention is big, transmission accuracy is high, and shift process is steady, easy-to-operate, and rational in infrastructure, it is easy to manufacture.
Description
Technical field
The present invention relates to a kind of operation gear-box, in particular for rail mounted hydraulic-driven large speed ratio, in high precision operation gear-box.
Background technology
Rail mounted hydraulic-driven operation gear-box, after a constant-speed ratio is changed, it is transferred to wheel by the power of gear drive adjutant's power source transmission, drive car load operation traveling, operation gear-box can meet the requirement of car load low speed operation traveling, also adapting to car load high speed traveling, gear-box realizes low speed operation and the conversion of high speed traveling gear and locking by shift lock mechanism.Existing rail mounted hydraulic-driven operation gear-box mainly has a kind of form, as introduced the 08-32 type tamping car operation axle gear box of Plasser Theurer company of Austria, its gear-box is by primary speed-down gear pair, casing, bearing and shift lock mechanism etc. form, shift lock mechanism stirs by shift fork that driving gear is de-puts into gear, with spring, steel ball component locking gear positions, gearshift inconvenience, it is unreliable to lock, in order to enable normally de-putting into gear, gear pair design meshing backlass is bigger than normal, in addition, cabinet design gear pair installation site is fixed, centre-to-centre spacing is non-adjustable, it is not suitable for high accuracy transmission；By track run inside away from and bogie overall space requirement, gear ratio is less than normal, is not suitable for Large-torsion transmisson requirement.
Summary of the invention
It is an object of the invention to provide a kind of large speed ratio, in high precision transmission, shift process is steady, easy-to-operate, and rational in infrastructure, it is easy to the operation gear-box of manufacture.
nullIn order to achieve the above object，The technical scheme is that a kind of operation gear-box，Including hydraulic motor、Casing、Driving gear shaft、Driven gear、Intermediate gear shaft、Axle gear、It is right to take turns、Gearshift and locking mechanism，Wherein said driven gear is fixed on intermediate gear shaft，Driven gear often engages with driving gear shaft，Described axle gear is connected in wheel to upper，And by gearshift and intermediate gear shaft engagement or disengagement，On described casing, planetary gear speed reducing mechanism is installed，Described planetary gear speed reducing mechanism couples with driving gear shaft，The input of described planetary gear speed reducing mechanism is bevel-gear sett auxiliary driving，Hydraulic motor couples by bevel gear pair is vertical with planetary gear speed reducing mechanism，Indication mechanism of shifting gears it is also equipped with on described casing，Described gearshift indication mechanism includes installing plate、Sleeve、Display axle、Spring and pressing plate，Described sleeve and pressing plate are fixing on a mounting board，Described display axle is inserted in sleeve，Top is slidably matched with pressing plate，And upper end stretches outside pressing plate，Bottom is slidably matched with sleeve，And lower end is stretched outside sleeve and offsets with the side of rotating turret，Described spring is positioned in sleeve，One end offsets with pressing plate，The other end offsets with display axle，Described installing plate is fixed on casing.
The bottom of described display axle has convex shoulder, and the bottom of convex shoulder can offset with the cylinder inner bottom part of sleeve, and the top of convex shoulder offsets with the bottom of spring.
Described pressing plate with display axle be slidably matched position equipped with sealing member.
The upper end of described display axle has external screw thread, and external screw thread connects nut.
Described gearshift includes driving cylinder of shifting gears, gearshift driving cylinder is connected on casing, described gearshift also includes push rod, contiguous block and rotating turret, described push rod is positioned at casing, and opposite case reciprocatingly slides, the described piston rod of gearshift driving cylinder is connected with one end of push rod, the other end of described push rod is hinged with contiguous block, described contiguous block is hinged with rotating turret, described rotating turret is enclosed within outside driving gear shaft, and swing around driving gear shaft, the equal rotating support in two ends of described intermediate gear shaft is on rotating turret, when described rotating turret swings, intermediate gear shaft engages with axle gear or separates.
Described locking mechanism includes the stroke block being correspondingly provided with on the locating piece installed on casing and rotating turret, and after gearshift driving cylinder promotes rotating turret to swing and hang shelves, the stroke block on rotating turret can recline with locating piece with latched position mutually.
Described rotating turret has two yokes, it is respectively provided with connecting hole and supported hole on two yokes, equipped with clutch shaft bearing seat in described connecting hole, clutch shaft bearing rotating support is passed through respectively on clutch shaft bearing seat in described driving gear shaft two ends, clutch shaft bearing seat is bearing on casing by the second bearing again, the supported hole of said two yoke is respectively arranged with the 3rd bearing, the two ends of described intermediate gear shaft all by the 3rd bearing rotating support on the yoke of rotating turret.
After using said structure, owing to described planetary gear speed reducing mechanism input is bevel-gear sett auxiliary driving, hydraulic motor is vertical with planetary gear speed reducing mechanism to be coupled, save gear-box and be transversely mounted space, gear-box uses planetary gear speed reducing mechanism and the combination transmission of secondary gear wheel set, and transmission speed ratio is big, and performance capacity is strong, planetary gear speed reducing mechanism uses bevel gear pair input, space connection and reasonable arrangement；Shift process gear joint progresses into engagement or progressively disengages engagement, shift process is steady, without impact, easy-to-operate, and gear pair meshed center distance can be adjusted by gearshift stroke, can realize gear pair zero sideshake transmission, transmission accuracy is high.
Accompanying drawing explanation
The present invention is further detailed explanation for the embodiment be given below in conjunction with accompanying drawing.
Fig. 1 is that the gear-box of the present invention is connected to wheel to upper structural representation；
Fig. 2 is the A-A sectional view that the present invention is in Fig. 1 when putting into gear position；
Fig. 3 is the A-A sectional view of present invention Fig. 1 when being in neutral gear position；
Fig. 4 is the B direction view of Fig. 1；
Fig. 5 is the structural representation of the rotating turret in the present invention；
Fig. 6 is the top view of Fig. 5；
Fig. 7 is the structural representation of the gearshift indication mechanism in the present invention.
Detailed description of the invention
nullSuch as Fig. 1、2、3、4、Shown in 7，A kind of operation gear-box of the present invention，Including hydraulic motor 2、Casing 4、Driving gear shaft 7、Driven gear 10、Intermediate gear shaft 11、Axle gear 12、Wheel is to 1、Gearshift and locking mechanism，Wherein said driven gear 10 is fixed on intermediate gear shaft 11，Driven gear 10 often engages with driving gear shaft 7，Described axle gear 12 is connected in wheel on 1，And by gearshift and intermediate gear shaft 11 engagement or disengagement，On described casing 4, planetary gear speed reducing mechanism 3 is installed，Described planetary gear speed reducing mechanism 3 couples with driving gear shaft 7，The input of described planetary gear speed reducing mechanism 3 is bevel-gear sett secondary 3-1 transmission，Hydraulic motor 2 couples by bevel gear pair 3-1 is vertical with planetary gear speed reducing mechanism 3，Indication mechanism 19 of shifting gears it is also equipped with on described casing 4，Described gearshift indication mechanism 19 includes installing plate 19-2、Sleeve 19-4、Display axle 19-1、Spring 19-3 and pressing plate 19-5，Described sleeve 19-4 and pressing plate 19-5 is fixed on installing plate 19-2，Described display axle 19-1 is inserted in sleeve 19-4，Top is slidably matched with pressing plate 19-5，And upper end stretches outside pressing plate 19-5，Bottom is slidably matched with sleeve 19-4，And lower end is stretched outside sleeve 19-4 and offsets with the side of rotating turret 5，Described bullet 19-3 is positioned in sleeve 19-4，One end offsets with pressing plate 19-5，The other end offsets with display axle 19-1，Described installing plate 19-2 is fixed on casing 4.
As it is shown in fig. 7, the bottom of described display axle 19-1 has convex shoulder 19-1-1, the bottom of convex shoulder 19-1-1 can offset with the cylinder inner bottom part of sleeve 19-4, and the top of convex shoulder 19-1-1 offsets with the bottom of spring 19-3.
As it is shown in fig. 7, described pressing plate 19-5's is slidably matched position equipped with sealing member 19-6 with display axle 19-1.
As it is shown in fig. 7, the upper end of described display axle 19-1 has external screw thread 19-1-2, on external screw thread 19-1-2, connection has nut 19-7.
Such as Fig. 2, shown in 3, described gearshift includes driving cylinder 6 of shifting gears, gearshift driving cylinder 6 is connected on casing 4, described gearshift also includes push rod 15, contiguous block 16 and rotating turret 5, described push rod 15 is positioned at casing 4, and opposite case 4 reciprocatingly slides, the piston rod 6-1 of described gearshift driving cylinder 6 is connected with one end of push rod 15, the other end of described push rod 15 is hinged with contiguous block 16, described contiguous block 16 is hinged with rotating turret 5, described rotating turret 5 is enclosed within outside driving gear shaft 7, and swing around driving gear shaft 7, the equal rotating support in two ends of described intermediate gear shaft 11 is on rotating turret 5, when described rotating turret 5 swings, intermediate gear shaft 11 engages with axle gear 12 or separates.
As shown in Figure 2,3, described locking mechanism includes the stroke block 14 being correspondingly provided with on the locating piece 13 installed on casing 4 and rotating turret 5, after gearshift driving cylinder 6 promotes rotating turret 5 to swing and hang shelves, the stroke block 14 on rotating turret 5 can recline with locating piece 13 phase with latched position.Described stroke block 14 coordinates face to be plane with locating piece 13, and locked secure is reliable.
As shown in Fig. 5,6,1, described rotating turret 5 has two yoke 5-1, connecting hole 5-1-1 and supported hole 5-1-2 it is respectively provided with on two yoke 5-1, equipped with clutch shaft bearing seat 8 in described connecting hole 5-1-1, clutch shaft bearing 18 rotating support is passed through respectively on clutch shaft bearing seat 8 in described driving gear shaft 7 two ends, clutch shaft bearing seat 8 is bearing on casing 4 by the second bearing 9 again, the supported hole 5-1-2 of said two yoke 5-1 is respectively arranged with the 3rd bearing 17, the two ends of described intermediate gear shaft 11 all by the 3rd bearing 17 rotating support on the yoke 5-1 of rotating turret 5.
As shown in Fig. 1,2,3,4,7, the operation principle of gear-box of the present invention is as follows: when operation traveling operating mode is run, gearshift driving cylinder 6 drives piston rod 6-1 to forward extend out, push rod 15 is promoted to move forward, contiguous block 16 is promoted to drive rotating turret 5 to swing upwards about driving gear shaft 7, intermediate gear shaft 11 is made to engage with axle gear 12, stroke block 14 and locating piece 13 laminating locking, power is transferred to take turns 1 through secondary gear auxiliary driving again by hydraulic motor 2 through planetary gear speed reducing mechanism 3, drives car load operation traveling；High speed traveling and when hanging together operation, gearshift driving cylinder 6 drives piston rod 6-1 to retract backward, drives push rod 15 to be moved rearwards by, contiguous block 16 is driven to drive rotating turret 5 to swing around driving gear shaft 7 downwards, making intermediate gear shaft 11 disengage with axle gear 12, now, gear-box is by running under power.
Described intermediate gear shaft 11 accurately can be adjusted by gearshift stroke with axle gear 12 meshed center distance, can realize gear pair zero sideshake transmission, and driving gear shaft 7 often engages with driven gear 10, and gear-box entirety can realize high accuracy transmission.
Described display axle 19-1 drives rotating turret 5 to rotate upwardly and downwardly and pump with gearshift, can accurately judge the range state residing for gear-box from the height of gear-box external observation display axle 19-1.
Claims (7)
1. an operation gear-box, including hydraulic motor (2), casing (4), driving gear shaft (7), driven gear (10), intermediate gear shaft (11), axle gear (12), wheel to (1), gearshift and locking mechanism, wherein said driven gear (10) is fixed on intermediate gear shaft (11), driven gear (10) often engages with driving gear shaft (7), described axle gear (12) is connected in wheel on (1), and by gearshift and intermediate gear shaft (11) engagement or disengagement, it is characterised in that:
Being provided with planetary gear speed reducing mechanism (3) on a, described casing (4), described planetary gear speed reducing mechanism (3) couples with driving gear shaft (7),
B, the input of described planetary gear speed reducing mechanism (3) are secondary (3-1) transmission of bevel-gear sett, and hydraulic motor (2) couples by bevel gear pair (3-1) is vertical with planetary gear speed reducing mechanism (3),
Indication mechanism (19) of shifting gears it is also equipped with on c, described casing (4),
nulld、Described gearshift indication mechanism (19) includes installing plate (19-2)、Sleeve (19-4)、Display axle (19-1)、Spring (19-3) and pressing plate (19-5)，Described sleeve (19-4) and pressing plate (19-5) are fixed on installing plate (19-2)，Described display axle (19-1) is inserted in sleeve (19-4)，Top is slidably matched with pressing plate (19-5)，And upper end stretches outside pressing plate (19-5)，Bottom is slidably matched with sleeve (19-4)，And lower end is stretched outside sleeve (19-4) and offsets with the side of rotating turret (5)，Described spring (19-3) is positioned in sleeve (19-4)，One end offsets with pressing plate (19-5)，The other end offsets with display axle (19-1)，Described installing plate (19-2) is fixed on casing (4).
Operation gear-box the most according to claim 1, it is characterized in that: the bottom of described display axle (19-1) has convex shoulder (19-1-1), the bottom of convex shoulder (19-1-1) can offset with the cylinder inner bottom part of sleeve (19-4), and the top of convex shoulder (19-1-1) offsets with the bottom of spring (19-3).
Operation gear-box the most according to claim 1, it is characterised in that: described pressing plate (19-5) with display axle (19-1) be slidably matched position equipped with sealing member (19-6).
Operation gear-box the most according to claim 1, it is characterised in that: the upper end of described display axle (19-1) has external screw thread (19-1-2), and the upper connection of external screw thread (19-1-2) has nut (19-7).
nullOperation gear-box the most according to claim 1，It is characterized in that: described gearshift includes driving cylinder (6) of shifting gears，Gearshift driving cylinder (6) is connected on casing (4)，Described gearshift also includes push rod (15)、Contiguous block (16) and rotating turret (5)，Described push rod (15) is positioned at casing (4)，And opposite case (4) reciprocatingly slides，The piston rod (6-1) of described gearshift driving cylinder (6) is connected with one end of push rod (15)，The other end of described push rod (15) is hinged with contiguous block (16)，Described contiguous block (16) is hinged with rotating turret (5)，Described rotating turret (5) is enclosed within outside driving gear shaft (7)，And swing around driving gear shaft (7)，The equal rotating support in two ends of described intermediate gear shaft (11) is on rotating turret (5)，When described rotating turret (5) swings，Intermediate gear shaft (11) engages with axle gear (12) or separates.
Operation gear-box the most according to claim 1, it is characterized in that: described locking mechanism includes the stroke block (14) being correspondingly provided with on the upper locating piece (13) installed of casing (4) and rotating turret (5), after gearshift driving cylinder (6) promotes rotating turret (5) to swing and hang shelves, the stroke block (14) on rotating turret (5) can recline with locating piece (13) with latched position mutually.
Operation gear-box the most according to claim 1, it is characterized in that: described rotating turret (5) has two yokes (5-1), connecting hole (5-1-1) and supported hole (5-1-2) it is respectively provided with on two yokes (5-1), equipped with clutch shaft bearing seat (8) in described connecting hole (5-1-1), clutch shaft bearing (18) rotating support is passed through respectively on clutch shaft bearing seat (8) in described driving gear shaft (7) two ends, clutch shaft bearing seat (8) is bearing on casing (4) by the second bearing (9) again, the supported hole (5-1-2) of said two yoke (5-1) is respectively arranged with the 3rd bearing (17), the two ends of described intermediate gear shaft (11) all by the 3rd bearing (17) rotating support on the yoke (5-1) of rotating turret (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410448018.8A CN104235303B (en) | 2014-10-08 | 2014-10-08 | Operation gear-box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410448018.8A CN104235303B (en) | 2014-10-08 | 2014-10-08 | Operation gear-box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104235303A CN104235303A (en) | 2014-12-24 |
| CN104235303B true CN104235303B (en) | 2016-09-14 |
Family
ID=52223967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410448018.8A Active CN104235303B (en) | 2014-10-08 | 2014-10-08 | Operation gear-box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104235303B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465346B (en) * | 2015-12-25 | 2017-10-10 | 常州市瑞泰工程机械有限公司 | Gear-box with shifter |
| CN106763558B (en) * | 2017-01-19 | 2023-07-18 | 郑州机械研究所有限公司 | Driving gear box transmission device of subway engineering vehicle |
| CN108715117A (en) * | 2018-07-10 | 2018-10-30 | 徐工集团工程机械有限公司 | A kind of dual-purpose assembly of rail |
| CN108705907A (en) * | 2018-07-10 | 2018-10-26 | 徐工集团工程机械有限公司 | A kind of dual-purpose power truck of rail |
| CN111284328A (en) * | 2020-02-25 | 2020-06-16 | 株洲时代电子技术有限公司 | Transmission method of rail engineering vehicle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3100286B2 (en) * | 1994-06-16 | 2000-10-16 | 住友重機械工業株式会社 | Geared motor series |
| CN100451399C (en) * | 2007-02-12 | 2009-01-14 | 常州市瑞泰工程机械有限公司 | Axle gear box shifting locking mechanism |
| CN102797808B (en) * | 2012-02-29 | 2013-09-11 | 张家港市九鼎机械有限公司 | Speed control system |
| CN203009804U (en) * | 2012-12-06 | 2013-06-19 | 常州市瑞泰工程机械有限公司 | Gear box |
| CN204153089U (en) * | 2014-10-08 | 2015-02-11 | 常州市瑞泰工程机械有限公司 | A kind of operation gear-box |
-
2014
- 2014-10-08 CN CN201410448018.8A patent/CN104235303B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104235303A (en) | 2014-12-24 |
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Effective date of registration: 20170427 Address after: 213011 Wuyi Road, Changzhou, Jiangsu, No. 99, No. Co-patentee after: CRRC QISHUYAN INSTITUTE Co.,Ltd. Patentee after: CHANGZHOU RUITAI ENGINEERING MACHINERY Co.,Ltd. Address before: 213011 Wuyi Road, Qishuyan District, Jiangsu, China, No. 99, No. Patentee before: CHANGZHOU RUITAI ENGINEERING MACHINERY Co.,Ltd. |
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Address after: 213011 No. 99, Wuyi Road, Qishuyan, Changzhou City, Jiangsu Province Patentee after: Changzhou CRRC Ruitai Equipment Technology Co.,Ltd. Patentee after: CRRC QISHUYAN INSTITUTE Co.,Ltd. Address before: 213011 No. 99, Wuyi Road, Qishuyan, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU RUITAI ENGINEERING MACHINERY Co.,Ltd. Patentee before: CRRC QISHUYAN INSTITUTE Co.,Ltd. |
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Address after: 213011 No. 99, Wuyi Road, Qishuyan, Changzhou City, Jiangsu Province Patentee after: Changzhou CRRC Ruitai Equipment Technology Co.,Ltd. Country or region after: China Patentee after: CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co.,Ltd. Address before: 213011 No. 99, Wuyi Road, Qishuyan, Changzhou City, Jiangsu Province Patentee before: Changzhou CRRC Ruitai Equipment Technology Co.,Ltd. Country or region before: China Patentee before: CRRC QISHUYAN INSTITUTE Co.,Ltd. |
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