CN103757551A - Mechanically actuated chain wheel material, and manufacturing method thereof - Google Patents
Mechanically actuated chain wheel material, and manufacturing method thereof Download PDFInfo
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- CN103757551A CN103757551A CN201310680959.XA CN201310680959A CN103757551A CN 103757551 A CN103757551 A CN 103757551A CN 201310680959 A CN201310680959 A CN 201310680959A CN 103757551 A CN103757551 A CN 103757551A
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Abstract
The invention discloses a mechanically actuated chain wheel material, and a manufacturing method thereof. The mechanically actuated chain wheel material comprises following ingredients: 0.2 to 0.35 part of C, 0.35 to 0.55 part of Si, 0.6 to 0.9 part of Mn, Ni<=0.25 part, Cr<=0.20 part, S<=0.02 part, Al<=0.05 part, P<=0.03 part, Cu<=0.40 part, Mo<=0.05 part, V<=0.03 part, Nb<=0.01 part, Ti<=0.01 part, and the balance Fe. The manufacturing method comprises steps of (a) drawing; (b) material preparaing; (c) compacting and shaping; (d) sintering; (e) cooling; (f) rough machining; (g) gear hobbing processing; and (h) heat processing. According to the manufacturing method, the ingredients above are selected so as to obtain chain wheels with uniform strength. In preparation processes, the ingredients are delivered into a mould; a chain wheel blank material is obtained via upsetting extruding, and is subjected to sintering and cooling, so that the internal part of the mechanically actuated chain wheel material is compact, is high in strength, and is not easily fractured; gear hobbing processing is adopted, so that cost is reduced, and processing cycle is shortened; and phenolic aldehyde cloth base laminates are used, so that wear resistance and corrosion resistance of the chain wheels are increased.
Description
Technical field
The present invention relates to a kind of mechanical drive chain wheel material and manufacture method.
Background technology
Sprocket wheel is part important in chain drive, sprocket wheel is the wheel with cog type whelp, in order to pitch on pitch chain ring or cable accurately block be meshed or be solid or gear with spoke, engage to transmit motion with (roller) chain, be widely used in the mechanical transmission of the industries such as chemical industry, textile manufacturing machine, food-processing, instrument, oil etc.Conventionally, sprocket wheel by gear ring, take turns firm and spoke three parts and form.Conventionally, chain drive is comprised of the drive sprocket, driven sprocket and the chain on sprocket wheel that are contained on parallel shafts, in production line, by chain link plate and sprocket teeth engage drive, follow-up pulley turns round and transmits and moves and power, because chain drive belongs to the engaged transmission with middle flexible element, just can obtain transmission accurately, and the durable degree of sprocket wheel has determined mechanically operated working efficiency, the importance of sprocket wheel in mechanical transmission as can be seen here.Sprocket wheel in prior art is made in material, should select applicable transmission to finish the work: in belt work, its power is low, and transmission shaft pressure is large, is not suitable for working in the situations such as high temperature, low speed, greasy dirt; In geartransmission, gear diaxon width between centers is less, manufactures with setting accuracy and requires to provide, and cost is high; In chain drive, its preliminary tension is little, and power is large, can in the situations such as high temperature, low speed, greasy dirt, work, and gear diaxon width between centers is larger, and cost is low, according to actual needs, selects chain drive to finish the work.
Conventionally; chain drive all has high requirements to gear each side parameter; but tend to occur cast after; there is casting flaw in sprocket wheel; conventionally can adopt repairing way to make up; but because patching material and sprocket wheel material there are differences; cause the position after repairing can produce micro-crack, life-time service can rupture because of fatigue, and existing sprocket wheel intensity is inhomogeneous; easy to wear; rigidity and wearing no resistance, can not keep stable chain speed, and transmission stability reduces; in work, have the phenomenons such as noise, affect mechanical transmission work.
Sprocket wheel need to hold and receive periodic repeated stress when work, in rotation process, amplitude is large, wearing and tearing are large, the work-ing life of having reduced like this sprocket wheel, and also sprocket wheel adopts form cutter to process sprocket wheel at present, be applicable to the sprocket wheel processing that individuality or quantity are few, exist efficiency low, cost is high, the problem of process-cycle length etc.
Summary of the invention
The invention provides a kind of mechanical drive chain wheel material and manufacture method, to solve the technical problem that prior art middle sprocket intensity is inhomogeneous, rigidity is low, easy to wear, tooling cost is high, noise is large and the process-cycle is long.
The present invention adopts following technical scheme:
A kind of mechanical drive chain wheel material, is characterized in that comprising following composition:
Further, a kind of method of manufacturing the mechanical drive chain wheel described in claim 1, is characterized in that comprising the steps:
(a) draw: according to calculation result, on the working drawing of part, draw sprocket tooth form;
(b) batching: prepare burden according to design element mass ratio, and will prepare material and put into V-arrangement mixer and evenly mix, mixing time is 90 minutes;
(c) press forming: take out batch mixing, and batching is sent in precise compression molding mould, this precise compression molding mould at least reaches 6 grades, and smooth finish at least reaches 0.5, adopts the multistage floating die assembly frame of automatic and separated, on Full Automatic Liquid press, set the pressure of 40MPa, by multistage, float, realize automatic moving powder, then in precise compression molding mold cavity, jumping-up extruding forms sprocket wheel blank, and the density of sprocket wheel blank is greater than or equal to 7.5Mg/m
3, the surface hardness of wheel tooth tip is more than or equal to 70HRA, and Vickers' hardness is 450HV;
(d) sintering: the sprocket wheel blank of compression moulding is put into 50KW push-down sintering oven and carry out sintering, temperature is controlled at 1000～1100 degrees Celsius, when blank heating is to initial forging temperature, comes out of the stove immediately;
(e) cooling: first with air cooling air blast, to be cooled fast to 300 degrees Celsius, then the sprocket wheel sintering to be put into stove slow cooling;
(f) roughing: sprocket wheel is carried out to elementary processing, roughing external diameter and axis hole after the available steel plate cutting of gear ring part, axis hole one side is stayed bevel for welding, then adopt bar car flange portion to carry out convex, gear ring part and flange part phase-splitting are spelled rear two-sided welding and are reprocessed into product, make it reach design thickness, then fin cutting, the process redundancy of reserved 0.4mm on the thickness direction of sprocket wheel wheel body;
(g) gear hobbing processing: according to the sprocket tooth profile on the equal space line of the cycloid of sprocket wheel, adopt hobboing cutter, utilize generating principle to carry out gear hobbing processing, in the course of processing, hobboing cutter revolves and turns around, sprocket wheel just turns over a tooth, and hobboing cutter and sprocket wheel, in conjugate action, are machined to design thickness, gear teeth thickness is machined to 7mm, wheel body thickness is machined to 7.1mm～7.2mm, then sprocket is carried out to rounding processing, and wheel body is holed;
(h) thermal treatment: flank of tooth high-frequency quenching, electric current is 900～950A, tempering temperature is 210～215 degrees Celsius, then on sprocket wheel, with cotton, soaks with resol, then carries out hot pressing, forms phenolic aldehyde lamination fabric swatch.
The present invention, owing to having adopted technique scheme, has following beneficial effect:
In material of the present invention, control material mixture ratio content, material surface hardness and mechanical property are improved greatly, Hardness Distribution is even, adopts nickel, molybdenum, copper and carbon, improves the strength of materials and hardening capacity; Adopt silicon, manganese, titanium ternary alloy multiple strengthening to obtain martensitic stucture, the hardness of material and toughness have good matching relationship, have strengthened wear resistance and the erosion resistance of sprocket wheel; A small amount of vanadium, titanium has the effect of precipitation strength, solid molten strengthening and crystal grain thinning, can improve the over-all properties of sprocket wheel; Chromium, vanadium are after Overheating Treatment, and tensile strength, yield strength significantly improve, and quenching hardness is high, have increased the routed ability of fastness to wear and resistance to compression; Niobium, boron are combined and can be significantly improved yield strength with vanadium, titanium; Phosphorus, sulphur increase can improve yield-point and tensile strength, increase cold shortness and the aging sensitivity of sprocket wheel foundry goods; Iron, aluminium improve intensity and the toughness of sprocket wheel foundry goods, and crystal grain thinning improves impelling strength, and entirety makes sprocket wheel even intensity, has improved rigidity, wear resistance and the preservative property of sprocket wheel.In manufacturing processed, batching is sent in precise compression molding mould, by jumping-up, is pushed and is formed sprocket wheel blank, and the density of sprocket wheel blank is greater than or equal to 7.5Mg/m
3, then by sintering, cooling, make inside become closely knit, Hardness Distribution is even, and intensity is high, not easy fracture, and adopt roughing and gear hobbing to process, improve form of gear tooth tolerance range, guarantee the hardness of gear, guaranteed that sprocket wheel reduces costs, shortened the process-cycle, adopt again phenolic aldehyde lamination fabric swatch, strengthened wear resistance and the erosion resistance of sprocket wheel, the simultaneously less generation of noise.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structured flowchart of mechanical drive chain wheel manufacture method in the present invention;
Fig. 2 is the structural representation of gear hobbing in the present invention;
Fig. 3 is the structural representation of mechanical drive chain wheel of the present invention.
embodiment
As shown in Figure 1 to Figure 3, the present invention is take mechanical drive chain wheel as example, select micro-entirety to make sprocket wheel even intensity, rigidity, wear resistance and the preservative property of sprocket wheel have been improved, and prepare burden and send in precise compression molding mould in manufacturing processed, by jumping-up, pushed and formed sprocket wheel blank, the density of sprocket wheel blank is greater than or equal to 7.5Mg/m
3, by sintering, then with air cooling air blast, be cooled fast to 300 degrees Celsius, again the sprocket wheel sintering is put into stove slow cooling cooling, make inside become closely knit, Hardness Distribution is even, and intensity is high, not easy fracture, and adopt gear hobbing processing, and reduce costs, shortened the process-cycle, adopt again phenolic aldehyde lamination fabric swatch, strengthened wear resistance and the erosion resistance of sprocket wheel.
In the present invention, mechanical drive chain wheel material comprises following composition:
All the other are that Fe element and other inevitable impurity form.Wherein adopt nickel, molybdenum, copper and carbon, improve the strength of materials and hardening capacity; Adopt silicon, manganese, titanium ternary alloy multiple strengthening to obtain martensitic stucture, the hardness of material and toughness have good matching relationship, have strengthened wear resistance and the erosion resistance of sprocket wheel; A small amount of vanadium, titanium has the effect of precipitation strength, solid molten strengthening and crystal grain thinning, can improve the over-all properties of sprocket wheel; Chromium, vanadium are after Overheating Treatment, and tensile strength, yield strength significantly improve, and quenching hardness is high, have increased the routed ability of fastness to wear and resistance to compression; Niobium, boron are combined and can be significantly improved yield strength with vanadium, titanium; Phosphorus, sulphur increase can improve yield-point and tensile strength, increase cold shortness and the aging sensitivity of sprocket wheel foundry goods; Iron, aluminium improve intensity and the toughness of sprocket wheel foundry goods, and crystal grain thinning improves impelling strength, and entirety makes sprocket wheel even intensity, has improved rigidity, wear resistance and the preservative property of sprocket wheel.
For in this manufacture method, the principle of design that the sprocket wheel of design need to be satisfied mainly should meet three aspects: for sprocket tooth form designs and require: engage requirement, service requirements, manufacturability and accuracy requirement.
(1) guarantee that chain is can be smoothly engaging-in and nibble out, do not have interference.
(2) there is enough chain pitch that holds and extend ability.
(3) there is rational angle of attack.
(4) tooth curve and chain drive operating mode adapt.
(5) be conducive to engaging-in and prevent because of the chain chain of beating.
(6) processing technology is good.
Producing in sprocket wheel, need to design teeth number of sprocket, pitch and roller diameter, its basic parameter is the pitch of adapted chain, maximum outside diameter, array pitch and the number of teeth of sleeve.The contrate tooth profile of sprocket wheel is standard tooth form, generally has 3 sections of circular arcs and diameter to form, when selecting this profile of tooth also with corresponding standard cutter processing.In known pitch P, in the situation of number of teeth z, by formula, draw tip diameter d
1:
D
2=d-d
1(d
1-d
3), wherein d is pitch circle diameter, d
3for roller diameter.
By calculating, design sprocket wheel axial profile and size, and draw profile of tooth on the working drawing of part, be convenient to manufacture the blank before cutting.The parameter of different sprocket wheels is as table 1:
Table 1
According to design element mass ratio, mix powder batching, and will prepare material and put into V-arrangement mixer and evenly mix, mixing time is 90 minutes, needs to check whether material imports completely before mixing.Take out again batch mixing, and batching is sent in special precise compression molding mould, the special casted die mould of this precision at least reaches 6 grades, and smooth finish at least reaches 0.5, adopts the multistage floating die assembly frame of automatic and separated, on Full Automatic Liquid press, set the pressure of 40MPa, by multistage, float, realize automatic moving powder, then in precise compression molding mold cavity, jumping-up extruding forms sprocket wheel blank, and the density of sprocket wheel blank is greater than or equal to 7.5Mg/m
3, the surface hardness of wheel tooth tip is more than or equal to 70HRA, and Vickers' hardness is 450HV.
The sprocket wheel blank of compression moulding is put into 50KW push-down sintering oven and carry out sintering, temperature is controlled at 1000～1100 degrees Celsius, wherein can adopt graphite protection heating, marquenching, prevents when thermal treatment part oxidation and decarbonization.When blank heating is to initial forging temperature, come out of the stove immediately, first with air cooling air blast, be cooled fast to 300 degrees Celsius, then the sprocket wheel sintering is put into stove slow cooling, tackle during this time the sprocket wheel processing of preventing dust.
The process tool of sprocket wheel generally can be selected: standard hob is applied in medium and small standard sprocket and processes; Dish milling cutter is by the multiple tooth disc type cutter of one of sprocket tooth form design; Forming cutter is a kind of by monodentate cutter of sprocket tooth form design etc.This manufacture method selects sprocket wheel to carry out roughing and precision work, improves form of gear tooth tolerance range, guarantees the hardness of gear.First sprocket wheel is carried out to elementary processing: roughing external diameter and axis hole after the available steel plate cutting of gear ring part, axis hole one side is stayed bevel for welding, then adopt bar car flange portion to carry out convex, gear ring part and flange part phase-splitting are spelled rear two-sided welding and are reprocessed into product, make it reach design thickness, fin cutting again, the process redundancy of reserved 0.4mm on the thickness direction of sprocket wheel wheel body.Again according to the sprocket tooth profile on the equal space line of the cycloid of sprocket wheel, adopt hobboing cutter, the sprocket wheel after utilizing generating principle to roughing carries out gear hobbing processing, in the course of processing, hobboing cutter revolves and turns around, sprocket wheel just turns over a tooth, and hobboing cutter and sprocket wheel, in conjugate action, are machined to design thickness, gear teeth thickness is machined to 7mm, wheel body thickness is machined to 7.1mm～7.2mm, finally sprocket is carried out to rounding processing, and wheel body is holed.
General sprocket wheel material and heat treatment mode are as table 2:
| Sprocket wheel material | Thermal treatment | Tooth face hardness |
| 15、20 | Carburizing, quenching, tempering | 50-60HRC |
| 35 | Normalizing | 160-200HBS |
| 45、50、ZG310-570 | Quenching, tempering | 40-45HRC |
| 15Cr、20Cr | Carburizing, quenching, tempering | 50-60HRC |
| 40Cr、35SiMn、35CrMn | Quenching, tempering | 40-50HRC |
| Be not less than the graphitic cast iron of HT150 | Quenching, tempering | 260-280HBS |
Table 2
In this manufacture, thermal treatment adopts flank of tooth high-frequency quenching, and electric current is 900～950A, and tempering temperature is 210～215 degrees Celsius, then on sprocket wheel, with cotton, soaks with resol, then carries out hot pressing, forms phenolic aldehyde lamination fabric swatch.
By manufacturing, output sprocket wheel meets as shown in table 3:
Table 3
Adopt above-mentioned manufacture method, the mechanical drive chain wheel inside in the present invention becomes closely knit, and Hardness Distribution is even, and intensity is high, and not easy fracture, reduces costs, and has shortened the process-cycle, has strengthened wear resistance and the erosion resistance of sprocket wheel.
By manufacturing, reach mechanical transmission (chain drive), preliminary tension is little, and power is large, can in the situations such as high temperature, low speed, greasy dirt, work, and gear diaxon width between centers is larger, and cost is low.The pinion(gear) number wherein designing according to chain drive mode with the relation of chain speed as table 4:
| The number of teeth | ≥18 | ≥22 | ≥27 | ≥39 |
| Chain speed | 0.8-2 | 2-7 | ＞7 | ＞22 |
Table 4
Chaindriven profit oil is very important, more important to the chain drive of high speed, heavy duty.Good lubricating can be alleviated impact, reduces wear, and postpones service life of chain.
These are only specific embodiments of the invention, but technical characterictic of the present invention is not limited to this.Anyly take the present invention as basis, for solving essentially identical technical problem, realize essentially identical technique effect, done ground simple change, be equal to and replace or modification etc., be all covered by among protection scope of the present invention.
Claims (2)
1. a mechanical drive chain wheel material, is characterized in that comprising following composition:
2. a method of manufacturing the mechanical drive chain wheel described in claim 1, is characterized in that comprising the steps:
(a) draw: according to calculation result, on the working drawing of part, draw sprocket tooth form;
(b) batching: prepare burden according to design element mass ratio, and will prepare material and put into V-arrangement mixer and evenly mix, mixing time is 90 minutes;
(c) press forming: take out batch mixing, and batching is sent in precise compression molding mould, this precise compression molding mould at least reaches 6 grades, and smooth finish at least reaches 0.5, adopts the multistage floating die assembly frame of automatic and separated, on Full Automatic Liquid press, set the pressure of 40MPa, by multistage, float, realize automatic moving powder, then in precise compression molding mold cavity, jumping-up extruding forms sprocket wheel blank, and the density of sprocket wheel blank is greater than or equal to 7.5Mg/m
3, the surface hardness of wheel tooth tip is more than or equal to 70HRA, and Vickers' hardness is 450HV;
(d) sintering: the sprocket wheel blank of compression moulding is put into 50KW push-down sintering oven and carry out sintering, temperature is controlled at 1000～1100 degrees Celsius, when blank heating is to initial forging temperature, comes out of the stove immediately;
(e) cooling: first with air cooling air blast, to be cooled fast to 300 degrees Celsius, then the sprocket wheel sintering to be put into stove slow cooling;
(f) roughing: sprocket wheel is carried out to elementary processing, roughing external diameter and axis hole after the available steel plate cutting of gear ring part, axis hole one side is stayed bevel for welding, then adopt bar car flange portion to carry out convex, gear ring part and flange part phase-splitting are spelled rear two-sided welding and are reprocessed into product, make it reach design thickness, then fin cutting, the process redundancy of reserved 0.4mm on the thickness direction of sprocket wheel wheel body;
(g) gear hobbing processing: according to the sprocket tooth profile on the equal space line of the cycloid of sprocket wheel, adopt hobboing cutter, utilize generating principle to carry out gear hobbing processing, in the course of processing, hobboing cutter revolves and turns around, sprocket wheel just turns over a tooth, and hobboing cutter and sprocket wheel, in conjugate action, are machined to design thickness, gear teeth thickness is machined to 7mm, wheel body thickness is machined to 7.1mm～7.2mm, then sprocket is carried out to rounding processing, and wheel body is holed;
(h) thermal treatment: flank of tooth high-frequency quenching, electric current is 900～950A, tempering temperature is 210～215 degrees Celsius, then on sprocket wheel, with cotton, soaks with resol, then carries out hot pressing, forms phenolic aldehyde lamination fabric swatch.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063514A (en) * | 2015-09-07 | 2015-11-18 | 宁波瑞国精机工业有限公司 | Iron chain pin for vehicles and processing method thereof |
| CN105624557A (en) * | 2016-02-22 | 2016-06-01 | 桐乡市搏腾贸易有限公司 | Mechanical transmission chain wheel and manufacturing method thereof |
| CN105643208A (en) * | 2016-01-18 | 2016-06-08 | 南通洋口对外贸易有限公司 | Production process suitable for high-strength round link chain under marine environment |
| CN106319368A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | Economical thin chain plate and manufacturing method thereof |
| CN106550643A (en) * | 2016-11-15 | 2017-04-05 | 柴英杰 | A kind of Radix Glycyrrhizae excavates equipment |
| CN107588179A (en) * | 2017-11-08 | 2018-01-16 | 临沂市金立机械有限公司 | A kind of new material for sprocket wheel gas quenching and the technique using material processing sprocket wheel |
| CN107794440A (en) * | 2017-08-30 | 2018-03-13 | 宁波亿润汽车零部件有限公司 | A kind of high intensity air admission fork pipe holder |
| CN109750148A (en) * | 2017-11-03 | 2019-05-14 | 常州盛天传动件有限公司 | A kind of mesh-belt conveying formula tempering production technology and production line for sprocket wheel production |
| CN110964976A (en) * | 2019-11-13 | 2020-04-07 | 中煤张家口煤矿机械有限责任公司 | Steel for chain wheel and preparation method and application thereof |
| CN111001998A (en) * | 2019-11-25 | 2020-04-14 | 浙江川益机械有限公司 | Production process of combined high-strength light chain wheel |
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| CN113481359A (en) * | 2021-07-09 | 2021-10-08 | 镇江市黄墟锚链有限公司 | High-toughness anchor chain wire drawing and tempering processing technology |
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| JPH04129621A (en) * | 1990-09-14 | 1992-04-30 | Mazda Motor Corp | Manufacture of gear member |
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| CN106319368B (en) * | 2015-06-16 | 2018-04-24 | 鞍钢股份有限公司 | Economical thin chain plate and manufacturing method thereof |
| CN106319368A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | Economical thin chain plate and manufacturing method thereof |
| CN105063514A (en) * | 2015-09-07 | 2015-11-18 | 宁波瑞国精机工业有限公司 | Iron chain pin for vehicles and processing method thereof |
| CN105643208A (en) * | 2016-01-18 | 2016-06-08 | 南通洋口对外贸易有限公司 | Production process suitable for high-strength round link chain under marine environment |
| CN105643208B (en) * | 2016-01-18 | 2019-03-12 | 南通洋口对外贸易有限公司 | A kind of production technology suitable for the high-tensile round-link chain under marine environment |
| CN105624557A (en) * | 2016-02-22 | 2016-06-01 | 桐乡市搏腾贸易有限公司 | Mechanical transmission chain wheel and manufacturing method thereof |
| CN106550643A (en) * | 2016-11-15 | 2017-04-05 | 柴英杰 | A kind of Radix Glycyrrhizae excavates equipment |
| CN107794440A (en) * | 2017-08-30 | 2018-03-13 | 宁波亿润汽车零部件有限公司 | A kind of high intensity air admission fork pipe holder |
| CN109750148A (en) * | 2017-11-03 | 2019-05-14 | 常州盛天传动件有限公司 | A kind of mesh-belt conveying formula tempering production technology and production line for sprocket wheel production |
| CN107588179A (en) * | 2017-11-08 | 2018-01-16 | 临沂市金立机械有限公司 | A kind of new material for sprocket wheel gas quenching and the technique using material processing sprocket wheel |
| CN107588179B (en) * | 2017-11-08 | 2020-02-07 | 临沂市金立机械有限公司 | Novel material for sprocket gas quenching and process for machining sprocket by using novel material |
| CN110964976A (en) * | 2019-11-13 | 2020-04-07 | 中煤张家口煤矿机械有限责任公司 | Steel for chain wheel and preparation method and application thereof |
| CN111001998A (en) * | 2019-11-25 | 2020-04-14 | 浙江川益机械有限公司 | Production process of combined high-strength light chain wheel |
| CN111745609A (en) * | 2020-07-07 | 2020-10-09 | 嵊州市特种链轮有限公司 | Sprocket processing positioner |
| CN113481359A (en) * | 2021-07-09 | 2021-10-08 | 镇江市黄墟锚链有限公司 | High-toughness anchor chain wire drawing and tempering processing technology |
| CN113481359B (en) * | 2021-07-09 | 2022-09-20 | 镇江市黄墟锚链有限公司 | High-toughness anchor chain wire drawing and tempering processing technology |
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Effective date of registration: 20190430 Address after: 528400 1/F, Building 6, Baotai Road, Zhongshan Citizen Town, Guangdong Province Patentee after: Zhongshan Shunren Machinery Manufacturing Co., Ltd. Address before: 312452 Sanjie Town Industrial Park, Shengzhou City, Shaoxing City, Zhejiang Province Patentee before: SHENGZHOU SPECIAL SPROCKET WHEEL CO., LTD. |