ProductList
- cycloidal-planetary-gear-speed-reducer
- gear-reducer
- ZQ, ZQH, ZQSH gear reducer
- The PM type cylindrical gear reducer
- The ZQA type cylindrical gear reducer
- The PJ type cylindrical gear reducer
- ZQ, ZQD high speed cylindrical gear reducer
- ZD, ZDH, ZDSH type reducer
- ZL, ZLH, ZLSH type reducer
- ZS, ZSH, ZSSH type reducer
- JZQ series gear reducer
- Gear ZLY, ZLZ hardened surface of cylindrical gear reducer JB/T8853-2001
- ZSC, ZSC (A).reduction box
- Gear ZDY, ZDZ hardened surface of cylindrical gear reducer JB/T8853-2001
- YK series conical and cylindrical gear reducer YB/T050-93
- Gear ZSY, ZSZ hardened surface of cylindrical gear reducer JB/T8853-2001
- K series conical and cylindrical gear reducer
- FDBY cone cylindrical gear reducer ZBJ19026-90
- FZLY cylindrical gear reducer ZBJ19004-88
- YN series gear reducer YB/T050-93
- HNK type circular arc gear reducer YB/T050-93
- QJY series of hoisting machinery reducer
- QJL crane vertical reducer JB/T8905.3-1999
- QJT crane set type reducer JB/T8905.4-1999
- QJD crane base type reducer JB/T8905.2-1999
- QJ type crane reducer JB/T89051-1999
- ZZL cone cylindrical gear reducer
- S series gear reducer
- DBY, DCY, DBZ, DCZ cylindrical gear reducer JB/T9002-1999
- ZDS type gear reducer JB/T5560-1991
- GS type high speed involute cylindrical gear box
- MHS, HS series of gear box
- JDX edge drive reducer JC/T878.2-2001
- The TJ315 type cylindrical gear reducer
- ZJY type shaft mounted cylindrical gear reducer JB/T 7007-1993
- ZWS series of spiral bevel gear reducer
- C a helical gear reducer
- PYZ series hardened shaft mounted speed reducer
- CR helical gear reducer
- CE two stage helical gear reducer
- ZLD, ZLDA spiral bevel gear reducer
- ZLS, ZLSA spiral bevel gear reducer
- ZLZ series of spiral bevel gear reducer
- JS series gear reducer
- NGLED gear reducer
- HD bevel gear commutator
- BZ series of spiral bevel gear steering box
- NT series of spiral bevel gear reducer
- XT series of spiral bevel gear reducer
- TH, TB high power reducer
- CHD type gear reducer motor
- Type CHM: horizontal straight gear reducer
- CH horizontal type single-phase, three-phase motor gear reducer
- Type CVD: gear reducer motor
- CVM type: straight vertical junction type gear reducer
- CV type vertical single-phase, three-phase motor gear reducer
- RC series helical (spiral bevel) steering gear box
- T series of spiral bevel gear steering box
- Z series spiral bevel gear reducer
- H helical gear box B spiral bevel gear helical gear box
- GH type roller movable teeth reducer JB/T6137-1992
- TZ series coaxial gear reducer JB/T7000-1993
- LC, LC (A) type two hardened cylinder gear vertical reducer
- LCW type horizontal level two hardened cylinder gear reducer
- DC, LDC, DCW cylindrical gear reducer
- DJC type vertical single-stage hardened cylinder gear reducer
- DSC, DZC vertical cylindrical gear reducer
- LPJ, LPB, LPP type vertical parallel shaft reducer of hard toothed surface
- FJ hardened cylinder gear reducer
- TY series coaxial gear reducer ZBJ19009-88
- Reducer ZBJI19027 with type QS
- NHD110 gear reducer
- DT series of spiral bevel gear reducer
- MC series hardened - gear speed reducer
- LTJ series transmission gear reducer
- VCYK type cone cylindrical gear reducer
- SD gear side mixer
- LC coaxial gear reducer
- TC cross spiral bevel gear reversing reducer
- QSJ series of cylindrical gear reducer
- PC series gear reducer
- SPJ-800 type reducer
- TYL series hardened cylinder gear reducer
- XT series gear reducer
- DBS series of unilateral double driving mill reducer
- ZJ axial cylindrical gear reducer JB/T 7337-1994
- ZL2 (Ⅱ 1 Chaplygin 2) cylindrical gear two stage reducer
- SP series conical gear commutator
- B180G type vertical cylinder gear reducer
- AT series spiral bevel gear reducer
- TE, TEK cylindrical gear reducer
- TF, TFK conical, cylindrical gear reducer
- QS, QSE, LG type "three in one" (jb-t9003-2004).
- QSC type "three in one" (jb-t9003-2004).
- PV series universal gear box
- ZD80, ZD90, ZD100 series helical gear reducer
- ZD (H) MCD80, 90, 100 series of cylindrical gear reducer
- The TMG suspension gear reducer
- SXH/B high power gear box
- DB spiral bevel gear DH parallel shaft helical gear reducer
- PJT series flat double gear box
- XHXB helical bevel gear series high power reducer
- MCD series gear reducer
- TEX type gear reducer
- TK series gear reducer
- TM series gear reducer
- JH/B series of industrial gear box
- ZFY, ZXY type of hardened cylinder gear reducer
- TD9000 series of hardened gear reducer
- TW, TWC series of shaft mounted speed reducer
- TA, TC9000 type of hardened gear reducer
- SL series high power gear box
- The PR module type gear reducer
- DSZC (D) universal speed reducer
- SKH type circular arc gear speed reducer
- ZSC (D) type high speed reducer
- LPYB-J, LSYB-J type vertical parallel axis gear reducer
- LFY type two stage vertical flange reducer of hard toothed surface
- GOJ type of hardened gear reducer
- JPT type of involute cylindrical gear reducer (JB-T10244-2001)
- KPTH type of involute cylindrical gear reducer JB/T10243 - 2001
- The B315 type cylindrical gear reducer
- AJ48 gear reducer
- GY type high speed arc cylindrical gear speed reducer increase (decrease)
- CF series conical cylindrical gear reducer
- TZ type three level vertical gear reducer
- TCJ series of cylindrical gear reducer
- QY hardened gear reducer for crane
- planet-gear-speed-reducer
- Gear-motor
- Worm-gear-reducer
- Harmonic reducer
- elevator
- Stepless reducer
- Special-reducer
- clutch
- support
- Three-reduction-box
- Belt-reduction-box
- Enterprise standard reducer (device)
- coupler-coupling
- Precision reducer
- Combined speed reducer
- Taiwan-foreign-reducer
- arrester
- motorized pulleys ;
- Electric
- Backstop
- asynchronous-motor
- synchronous-motor
- bearing enelosure; bearing oil seal ;
- Reducer fittings
- Lubricating oil, lubricating grease
Current positionReducerHome>> gear-reducer >> Gear ZSY, ZSZ hardened surface of cylindrical gear reducer JB/T8853-2001Suppliers
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Introduction
Shanghai letter transmission Machinery Co., Ltd. 产品样本
Chinese Name:上海枫信传动机械有限公司
Recommended for:
Shanghai letter transmission Machinery Co., the company has two production bases in Shanghai and Shandong, covering a total area of 300000 m2, a phase of the project has a modern standard factory building 60000 m2. The company leading product in a modular precision reducer, paral
Chinese Name:上海枫信传动机械有限公司
Recommended for:
Shanghai letter transmission Machinery Co., the company has two production bases in Shanghai and Shandong, covering a total area of 300000 m2, a phase of the project has a modern standard factory building 60000 m2. The company leading product in a modular precision reducer, paral
Changzhou YiLiKeZheng transmission equipment Co., Ltd. 产品样本
Chinese Name:常州义力科正传动设备有限公司
Recommended for:
The company was founded in the early ninety's, formerly known as the Wujin City Lu Jia Xiang cycloid gear factory, after 10 years of hard work, pioneering and innovative, has been completed, covering an area of 7000 square meters, plant more than 5000 square meters, more than 100
Chinese Name:常州义力科正传动设备有限公司
Recommended for:
The company was founded in the early ninety's, formerly known as the Wujin City Lu Jia Xiang cycloid gear factory, after 10 years of hard work, pioneering and innovative, has been completed, covering an area of 7000 square meters, plant more than 5000 square meters, more than 100
Taixing Ruixing Reducer Co. LTD. 产品样本
Chinese Name:泰兴市瑞星减速机有限公司.
Recommended for:
Product series include: SH series new three-ring reducer with less tooth difference, soft tooth surface, medium hard tooth surface, hard tooth surface cylindrical gear reducer, cycloid needle wheel, planet, worm and worm, electric roller and other series of reducer. With the deve
Chinese Name:泰兴市瑞星减速机有限公司.
Recommended for:
Product series include: SH series new three-ring reducer with less tooth difference, soft tooth surface, medium hard tooth surface, hard tooth surface cylindrical gear reducer, cycloid needle wheel, planet, worm and worm, electric roller and other series of reducer. With the deve
Lanzhou XiTeng Rungong Equipment Manufacturing Co., Ltd. 产品样本
Chinese Name:兰州西腾润工装备制造有限公司(原兰州减速机厂)
Recommended for:
Lanzhou West Teng Yun engineering equipment Manufacturing Co. (formerly Maryland Reducer Factory) was founded in 1965, is the former Ministry of Electronics Industry sentinel machinery enterprises, China is by gearbox Industry Association, Ministry of Chemical Industry sentinel e
Chinese Name:兰州西腾润工装备制造有限公司(原兰州减速机厂)
Recommended for:
Lanzhou West Teng Yun engineering equipment Manufacturing Co. (formerly Maryland Reducer Factory) was founded in 1965, is the former Ministry of Electronics Industry sentinel machinery enterprises, China is by gearbox Industry Association, Ministry of Chemical Industry sentinel e
Hebei Qinjian mechanical equipment Co., Ltd 产品样本
Chinese Name:河北秦减机械设备有限公司
Recommended for:
The company specializes in the production of circular arc cylindrical worm reducer, rskf four series hard tooth surface gear reducer, plane secondary envelope reducer, worm screw elevator, high-power gear reducer, 8000 Series planetary reducer, cycloid reducer, NMRV worm gear red
Chinese Name:河北秦减机械设备有限公司
Recommended for:
The company specializes in the production of circular arc cylindrical worm reducer, rskf four series hard tooth surface gear reducer, plane secondary envelope reducer, worm screw elevator, high-power gear reducer, 8000 Series planetary reducer, cycloid reducer, NMRV worm gear red
ChangZhou RuiYou Machinery Manufacturing Co.,Ltd 产品样本
Chinese Name:常州瑞优机械制造有限公司
Recommended for:
Changzhou Zhengrui Machinery Manufacturing Co., Ltd. located in the beautiful Jiangnan Town - Changzhou City, Wujin hi tech Development Zone, the company is divided into mold manufacturing and R & D, sales and service, speed reducer service repair services to the Professional Com
Chinese Name:常州瑞优机械制造有限公司
Recommended for:
Changzhou Zhengrui Machinery Manufacturing Co., Ltd. located in the beautiful Jiangnan Town - Changzhou City, Wujin hi tech Development Zone, the company is divided into mold manufacturing and R & D, sales and service, speed reducer service repair services to the Professional Com
Zibo Boshan Xuyu Machinery Co., Ltd. 产品样本
Chinese Name:淄博博山旭宇机械有限公司
Recommended for:
Zibo Boshan Xuyu Machinery Co., Ltd., located in the historical and cultural city -- Shandong province Zibo city Boshan District, the geographical position is superior, convenient and quick transportation and communication, is one of the local manufacturing, research and developm
Chinese Name:淄博博山旭宇机械有限公司
Recommended for:
Zibo Boshan Xuyu Machinery Co., Ltd., located in the historical and cultural city -- Shandong province Zibo city Boshan District, the geographical position is superior, convenient and quick transportation and communication, is one of the local manufacturing, research and developm
Qingdao hairuide reducer factory 产品样本
Chinese Name:青岛海瑞得减速机厂
Recommended for:
Qingdao Hai Rui was Reducer Factory is China Heavy Machinery Industry Association, China reducer Industry Association, is engaged in various types of reducer Technology development, consulting services, product testing and production of key enterprises. I plant with th
Chinese Name:青岛海瑞得减速机厂
Recommended for:
Qingdao Hai Rui was Reducer Factory is China Heavy Machinery Industry Association, China reducer Industry Association, is engaged in various types of reducer Technology development, consulting services, product testing and production of key enterprises. I plant with th
Taixing Huayuan reducer manufacturing Co., Ltd. 产品样本
Chinese Name:泰兴市华源减速机制造有限公司
Recommended for:
Taixing City, Jiangsu Province, Huayuan reducer manufacturing Co., Ltd., is located in the famous hometown of China reducer. Companies from the famous Jiangyin Yangtze River bridge and the new long railway is only 20 minutes car program, Nanjing, Nanjing, Ningjingyan high-speed i
Chinese Name:泰兴市华源减速机制造有限公司
Recommended for:
Taixing City, Jiangsu Province, Huayuan reducer manufacturing Co., Ltd., is located in the famous hometown of China reducer. Companies from the famous Jiangyin Yangtze River bridge and the new long railway is only 20 minutes car program, Nanjing, Nanjing, Ningjingyan high-speed i
Taixing Boqiang reducer manufacturing factory 产品样本
Chinese Name:泰兴市博强减速机制造厂
Recommended for:
Division I professional production cycloid. ★ ★ ★ ★ circular cylindrical gear roller hardened ★ ★ NGW planetary gear circular worm gear reducer. The company is based on: personality integrity innovation Thanksgiving business philosophy, she appeared to be completely rigid duty to
Chinese Name:泰兴市博强减速机制造厂
Recommended for:
Division I professional production cycloid. ★ ★ ★ ★ circular cylindrical gear roller hardened ★ ★ NGW planetary gear circular worm gear reducer. The company is based on: personality integrity innovation Thanksgiving business philosophy, she appeared to be completely rigid duty to
Wuqiao County Jianhao Deceleration Machinery Sales Co., Ltd 产品样本
Chinese Name:吴桥县建豪减速机械销售有限公司
Recommended for:
Wuqiao County Jianhao Deceleration Machinery Sales Co., Ltd
Chinese Name:吴桥县建豪减速机械销售有限公司
Recommended for:
Wuqiao County Jianhao Deceleration Machinery Sales Co., Ltd
Taixing HENGFA reducer manufacturing Co., Ltd. 产品样本
Chinese Name:泰兴市恒发减速机制造有限公司
Recommended for:
Taixing HENGFA reducer manufacturing Co., Ltd. is the production of various kinds of reducer professional manufacturers, Hoisting Machinery Industry Association sentinel supporting enterprises, has many years of production history, the company has rich production experience, stro
Chinese Name:泰兴市恒发减速机制造有限公司
Recommended for:
Taixing HENGFA reducer manufacturing Co., Ltd. is the production of various kinds of reducer professional manufacturers, Hoisting Machinery Industry Association sentinel supporting enterprises, has many years of production history, the company has rich production experience, stro
Taixing Kangya reducer manufacturing Co., Ltd 产品样本
Chinese Name:泰兴市康亚减速机制造有限公司
Recommended for:
Kangya Taixing Taixing Reducer Co., Ltd. is specialized in producing all kinds of gear manufacturers, Ministry of Chemical Industry sentinel production enterprises reducer. Strong technical force, advanced detection equipment. Existing fixed assets of 35 million yuan, 230 employe
Chinese Name:泰兴市康亚减速机制造有限公司
Recommended for:
Kangya Taixing Taixing Reducer Co., Ltd. is specialized in producing all kinds of gear manufacturers, Ministry of Chemical Industry sentinel production enterprises reducer. Strong technical force, advanced detection equipment. Existing fixed assets of 35 million yuan, 230 employe
TEDA Xin Xin Fu Long Transmission Equipment Co., Ltd. 产品样本
Chinese Name:天津开发区鑫福龙传动设备有限公司
Recommended for:
Xin Fu Dragon International ( Holdings ) Limited is a collection of science, industry and trade as one of the modern international group company, mainly in research and development, production and sales , transmission equipment , control systems for leading industries, investment
Chinese Name:天津开发区鑫福龙传动设备有限公司
Recommended for:
Xin Fu Dragon International ( Holdings ) Limited is a collection of science, industry and trade as one of the modern international group company, mainly in research and development, production and sales , transmission equipment , control systems for leading industries, investment
Qingdao Guanxin Shun reducer manufacturing Co., Ltd. 产品样本
Chinese Name:青岛冠鑫顺减速机制造有限公司
Recommended for:
Qingdao guanshun Machinery Factory is located in the beautiful coastal city - Qingdao. Our company since its inception, after many years of management, now has professional production technology, rich production experience, advanced production technology, sophisticated management
Chinese Name:青岛冠鑫顺减速机制造有限公司
Recommended for:
Qingdao guanshun Machinery Factory is located in the beautiful coastal city - Qingdao. Our company since its inception, after many years of management, now has professional production technology, rich production experience, advanced production technology, sophisticated management
Taixing Hetai Machinery Manufacturing Co., Ltd. 产品样本
Chinese Name:泰兴和泰机械制造有限公司
Recommended for:
Taixing Hetai Machinery Manufacturing Co., Ltd. is the production of various kinds of reducer professional manufacturers, is located in the Yangtze River Delta have ginkgo village, the township building, education of the township's reputation, Chinese international super hero Yan
Chinese Name:泰兴和泰机械制造有限公司
Recommended for:
Taixing Hetai Machinery Manufacturing Co., Ltd. is the production of various kinds of reducer professional manufacturers, is located in the Yangtze River Delta have ginkgo village, the township building, education of the township's reputation, Chinese international super hero Yan
Zibo Boshan Xinjie Machinery Co., Ltd. 产品样本
Chinese Name:淄博市博山鑫杰机械有限公司
Recommended for:
Zibo Boshan Xinjie Machinery Co., Ltd., located in the historical and cultural city -- Shandong province Zibo city Boshan District, the geographical position is superior, convenient and quick transportation and communication, is one of the local manufacturing, research and develo
Chinese Name:淄博市博山鑫杰机械有限公司
Recommended for:
Zibo Boshan Xinjie Machinery Co., Ltd., located in the historical and cultural city -- Shandong province Zibo city Boshan District, the geographical position is superior, convenient and quick transportation and communication, is one of the local manufacturing, research and develo
Wuqiao County Tiecheng reducer factory 产品样本
Chinese Name:吴桥县铁城减速机厂
Recommended for:
Wuqiao County Tiecheng reducer factory
Chinese Name:吴桥县铁城减速机厂
Recommended for:
Wuqiao County Tiecheng reducer factory
Ningbo Dongli transmission equipment Co., Ltd. 产品样本
Chinese Name:宁波东力股份有限公司
Recommended for:
Ningbo East power transmission equipment Co. was founded in 1998 , has total assets of 1.3 billion yuan , registered capital of 180 million yuan , the production base grouped in Ningbo National Hi-tech District, Jiangbei Industrial Park , Jiangdong Qiu Bi industrial zone, covers
Chinese Name:宁波东力股份有限公司
Recommended for:
Ningbo East power transmission equipment Co. was founded in 1998 , has total assets of 1.3 billion yuan , registered capital of 180 million yuan , the production base grouped in Ningbo National Hi-tech District, Jiangbei Industrial Park , Jiangdong Qiu Bi industrial zone, covers
Qingdao ji'ao Machinery Manufacturing Co., Ltd. 产品样本
Chinese Name:青岛基奥机械制造有限公司
Recommended for:
Qingdao ji'ao Machinery Manufacturing Co., Ltd. mainly produces X.B planet cycloid reducer, and ZQ.ZQH.ZDY.ZLY.ZSY.WD.WS.WXJ.WHT.WPS.WPDS. WPDX.WPDO hardened cylinder gear reducer, worm gear reducer, widely used in metallurgy, mining, lifting, printing, transportation, petroleum
Chinese Name:青岛基奥机械制造有限公司
Recommended for:
Qingdao ji'ao Machinery Manufacturing Co., Ltd. mainly produces X.B planet cycloid reducer, and ZQ.ZQH.ZDY.ZLY.ZSY.WD.WS.WXJ.WHT.WPS.WPDS. WPDX.WPDO hardened cylinder gear reducer, worm gear reducer, widely used in metallurgy, mining, lifting, printing, transportation, petroleum
Taixing Geleite reducer Co., Ltd. 产品样本
Chinese Name:泰兴格雷特减速机有限公司
Recommended for:
Taixing geleite reducer Co., Ltd. is located in central Jiangsu Province, the famous historical and cultural city, the emerging industrial city of Taixing city. The company covers an area of 150000 square meters, construction area of 20000 square meters, is a professional product
Chinese Name:泰兴格雷特减速机有限公司
Recommended for:
Taixing geleite reducer Co., Ltd. is located in central Jiangsu Province, the famous historical and cultural city, the emerging industrial city of Taixing city. The company covers an area of 150000 square meters, construction area of 20000 square meters, is a professional product
Jiangsu Taixing reducer sales center. 产品样本
Chinese Name:江苏省泰兴减速机销售中心.
Recommended for:
The enterprise information is being sorted out! The enterprise information is being sorted out!
Chinese Name:江苏省泰兴减速机销售中心.
Recommended for:
The enterprise information is being sorted out! The enterprise information is being sorted out!
Zibo Boshan City Development Zone, Wang Li Machinery Plant 产品样本
Chinese Name:淄博市博山开发区力王机械厂
Recommended for:
Boshan Liwang Machinery Factory is a manufacturing heavy machinery Professional Company. Located in the "Qilu states" national tourist city -- Boshan, convenient transportation, lead in all directions, the company close to high-speed bleomycin, foreshore Bo junctions, the main pr
Chinese Name:淄博市博山开发区力王机械厂
Recommended for:
Boshan Liwang Machinery Factory is a manufacturing heavy machinery Professional Company. Located in the "Qilu states" national tourist city -- Boshan, convenient transportation, lead in all directions, the company close to high-speed bleomycin, foreshore Bo junctions, the main pr
Shaanxi Huaze drive Machinery Equipment Co., Ltd. 产品样本
Chinese Name:陕西华泽传动机械设备有限公司
Recommended for:
Shaanxi Huaze drive Machinery Equipment Co., Ltd. is mainly engaged in the reducer, coupling, transmission machinery pre-sale, sale, after sale service, and strict implementation of the "ISO9000 quality system certification" requirements. Perfect quality system and strict managem
Chinese Name:陕西华泽传动机械设备有限公司
Recommended for:
Shaanxi Huaze drive Machinery Equipment Co., Ltd. is mainly engaged in the reducer, coupling, transmission machinery pre-sale, sale, after sale service, and strict implementation of the "ISO9000 quality system certification" requirements. Perfect quality system and strict managem
Taixing Transmission Machinery Manufacturing Co., LTD. 产品样本
Chinese Name:泰兴市传动机械制造有限公司.
Recommended for:
Taixing Transmission Machinery Manufacturing Co., LTD.
Chinese Name:泰兴市传动机械制造有限公司.
Recommended for:
Taixing Transmission Machinery Manufacturing Co., LTD.
Shanghai Weisheng Transmission Machinery Co., LTD 产品样本
Chinese Name:上海玮盛传动机械有限公司.
Recommended for:
The enterprise information is being sorted out! The enterprise information is being sorted out!
Chinese Name:上海玮盛传动机械有限公司.
Recommended for:
The enterprise information is being sorted out! The enterprise information is being sorted out!
Huadong reducer manufacturing Co., Ltd. Tianjin Branch 产品样本
Chinese Name:华东减速机制造有限公司天津办事处
Recommended for:
Taixing Huadong reducer manufacturing Co., Ltd. (former Taixing speed reducer three factory) is a company engaged in the reducer, electric roller and gear distribution box R & D, manufacturing, sales of professional firms. Founded in 1986, is located in the Yangtze River in T
Chinese Name:华东减速机制造有限公司天津办事处
Recommended for:
Taixing Huadong reducer manufacturing Co., Ltd. (former Taixing speed reducer three factory) is a company engaged in the reducer, electric roller and gear distribution box R & D, manufacturing, sales of professional firms. Founded in 1986, is located in the Yangtze River in T
Hebei Qiaoxing reducer manufacturing Co., Ltd. 产品样本
Chinese Name:河北桥星减速机制造有限公司
Recommended for:
Our original Wuqiao Sky reducer Manufacturing Co., Ltd. officially changed its name to Hebei Qiaoxing reducer Manufacturing Co., Ltd. The company is located in the famous hometown of acrobatics --- Wuqiao, covers an area over 20,000 square meters, nearly twenty years of productio
Chinese Name:河北桥星减速机制造有限公司
Recommended for:
Our original Wuqiao Sky reducer Manufacturing Co., Ltd. officially changed its name to Hebei Qiaoxing reducer Manufacturing Co., Ltd. The company is located in the famous hometown of acrobatics --- Wuqiao, covers an area over 20,000 square meters, nearly twenty years of productio