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鏈條功率選用 SELECTION OF CHAIN DRIVE POWER

文章出處:http://www.ixxxtoys.com發表時間:2021/5/11 16:38:20

《滾子鏈傳動選擇指導》(GB/T 18150—2006 / ISO 10823:2004)標準已經公布。標準規定考慮鏈條實際傳遞功率時,應對主動鏈輪所傳遞的功率(即輸入功率)進行修正。

實際傳遞功率(修正功率)=輸入功率×工況系數×齒數系數工況系數見下表所列, 齒數系數=(19/Zs)1.08 (Zs—小鏈輪齒數)

The standard of "Guidelines for the Selection of Roller Chain Drives"(GB/T 18150-2006 / ISO 10823:2004) had been issued. If you try to calculate the actual transmission power of chain, you must consider revising the transmission power of driving sprocket (input power).

Actual power(Corrected power)=input power×service factor× teeth factor Service factor is listed in the following table.

Teeth factor = (19/Zs)1.08 (Zs—tooth number of the small sprocket)

 

世界各國歷史悠久的鏈條工廠都制定有自己的鏈傳動功率曲線和功率圖。GB/T 18150—2006 / ISO10823:2004 標準也建立了特定條件下的功率曲線圖,選擇鏈條傳動功率或由傳動功率選擇鏈條,前提是已知小鏈輪齒數和轉速,鏈條實際傳遞的功率在功率曲線圖的額定功率范圍內,所選擇的鏈條才是合適的。
現以工農十二型手扶拖拉機傳動部分和旋耕部分的傳遞功率,驗算鏈條選擇是否合理。
The chain factories with long history in the world have their own chain transmission power rating graph and power diagram. We can refer to the GB/T 18150-2006 / ISO 10823:2004 standard selecting the drive power or selecting chain according to the drive power, the condition is that we should know the tooth number of the small sprocket and its speed. Only if the actual power is within the range of rating power of the power rating graph, the selected chain is suitable.
Now we use the transmission part in walking tractor and the transmission power in rotary tillage to proof whether the chain selection is correct.
1. 傳動部分
小鏈輪轉速ns=1351 轉/ 分 小鏈輪齒數Zs=14 經修正后的實際傳遞功率=10.944 馬力=8.16 千瓦由B 系列滾子鏈功率曲線得知選擇08B-2 滾子鏈是合適的。
Chain drive part
Small sprocket speed ns=1351 Tooth number of small sprocket Zs=14
Actual power (Corrected power)=10.944hp=8.16kW
From B series horsepower rating graph, you will find selected 08B-2 chain is suitable.

2. 旋耕部分
小鏈輪轉速ns=199 轉/ 分 小鏈輪齒數Zs=13 經修正后的實際傳遞功率=9.888 馬力=7.37 千瓦由A 系列滾子鏈功率曲線得知選擇12A-2 滾子鏈是不合適的選型偏小正確選用應采用16A-1 滾子鏈或60H-2 重載型滾子鏈。
Rotary tillage chain part
Small sprocket speed ns=199 Tooth number of small sprocket Zs=13
Actual power (Corrected power)=9.888hp=7.37kW
From A series horsepower rating graph, you will find selected 12A-2 chain is unsuitable. You should choose 16A-1 or 60H-2 heavy duty roller chain instead of 12A-2.

注:多排鏈的額定功率可由單排鏈的額定功率乘以排數系數得到。
Note: The rating power of multiple strand chain can be obtained by multiplying the strand factor by the rating
power of single strand chain.

 

本功率曲線圖的特定條件主要是:        The main characteristics of this power graph are as follows

△小鏈輪齒數為19;                             For drive Zs=19

△鏈條長度為120個節距;                     Chain length: 120 pitches

△傳動比從1 : 3到3 : 1;                       Transmission ratio: 1 : 3 to 3 : 1
△鏈傳動的預期使用壽命為15000小時。  Service life of chain: 15000 hours

注:多排鏈的額定功率可由單排鏈的額定功率乘以排數系數得到。
Note: The rating power of multiple strand chain can be obtained by multiplying the strand factor by the rating
power of single strand chain.

 

本功率曲線圖的特定條件主要是:             The main characteristics of this power graph are as follows
△小鏈輪齒數為19;                                  For drive Zs=19
△鏈條長度為120個節距;                          Chain length: 120 pitches
△傳動比從1 : 3到3 : 1;                            Transmission ratio: 1 : 3 to 3 : 1
△鏈傳動的預期使用壽命為15000小時。       Service life of chain: 15000 hours

 

注:多排鏈的額定功率可由單排鏈的額定功率乘以排數系數得到。
Note: The rating power of multiple strand chain can be obtained by multiplying the strand factor by the rating
power of single strand chain.

 

■ 鏈傳動的潤滑   Lubrication
運行在鏈輪上的鏈條由于銷軸處鉸鏈的相對回轉而產生磨損。因此有效的潤滑就顯得至關重要,其不僅可以有效降低磨損且能降低功率損耗和噪音。
Wear is mainly caused by bearing pressure, angle-sliding movements of the pins and rotation of the rollers etc..
Effective lubrication of the chain hinges is utmost important for reducing wear, power loss and noise etc.
effectively.

Curve 1: Without lubrication. Chain would be worn out and destroyed within a very short time.
Curve 2: Optimum initial lubrication only. High wear would occur within a short time after the lubricant has been used up.
Curve 3: Manual lubrication. Intermittent dry rub frequently occurs, especially when regular periodical relubrication is not
well implemented.
Curve 4: Incorrect lubrication. Uneven chain wear results from incorrect lubrication.
Curve 5: Correct lubrication. The right lubrication is the utmost important to obtain a optimum service life.

■ 潤滑和有效性
Lubrication and efficiency

當摩擦副表面變色時表明潤滑已失效,在此之前應進行再次潤滑。
具體的潤滑失效間隔時間應依據特定的工況和運行條件進行試驗測定。
Relubrication shall be done before discoloration of the rub surface which indicates the lubrication failure of the former lubrication.The specific lubrication intervals shall be determined by tests based on specific conditions and running conditions.

 

■ 潤滑劑
Lubricant


 

 

潤滑劑的選擇首先取決于潤滑方式
First of all, the selection of an appropriate lubricant depends on the type of lubrication.

 

如圖所示,低粘度的礦物油特別適合鏈傳動
Just as the right diagram shows, low viscosity
mineral oils are particularly suitable for chain drives.

 

 

 

 

 

推薦的不同工作溫度下的潤滑劑應具備的粘度
Recommended viscosity

若使用溫度更高(如爐箱鏈)或使用環境很惡劣、泥漿四濺等開式或重載低速鏈傳動時,二硫化物(MoS2,WS2)或硒化物(MoSe2,WSe2)無論是用作添加劑還是直接噴潤都能提高潤滑性能。
低粘度或滴點在70℃左右的潤滑脂同樣適用于人工潤滑。在某些特殊的場合使用液化的潤滑脂進行噴潤。不穩定的物質揮發完后即可開始工作。
無論采用何種潤滑劑和潤滑方式,最重要的問題是使潤滑劑能及時充分均勻的分布到構成摩擦副的鏈節鉸鏈處的間隙中(銷軸- 套筒之間,套筒- 滾子之間)。

For higher temperatures (e.g. furnace chains) or severe operating conditions, mud spattering open-type etc. or heavy-duty low speed chains, graphite or molybdenum disulfide (MoS2) applied either as additive or spray will improve lubrication performance.
Low-viscosity or the grease products with a drop point of 70°C are also suitable for manual lubrication. Liquidized grease may be sprayed on the chains in special conditions and chains can start running immediately after the evaporation of the volatile carrier substance.
No matter which kind of lubricants and lubrication methods choosed, the most important issue is to ensure the lubricant flow into evenly (between pin and bush, between bush and roller).

■ 潤滑方式選擇
Selection of lubrication method
常見的潤滑方式有以下5種:
Normally, there are five lubrication methods as below:

 

1. 人工潤滑  Manual lubrication
用刷子或油壺定期在鏈條松邊內外鏈板間隙處加油。這種方式可靠性不高,因此僅適用于非經常工作的鏈條或低速二級傳動中。至少應每天充分潤滑一次(若條件允許,應每隔8 小時注油一次),應盡可能避免產生潤滑劑的變色現象。

This type of lubrication by means of oil can and brush, which adding lubricant into the gap between outer and inner link plate of chain loose side periodically is not very safe and therefore this type lubrication only suitable for those chains with occasional operation or for those secondary drives and low chain speeds. Sufficient lubrication should take place at least once a day (if possible once every eight running hours). Lubricant colouration should be avoided as far as possible.

2. 滴油潤滑
用油芯加油器,針閥式注油杯或滴油油杯加油,這種方式僅適用于低軸壓比的傳動,應盡可能避免產生潤滑劑的變色現象。
Drip lubrication by means of wick oilers, needle oilers or drip oilers is only suitable for low bearing pressure drives. Lubricant colouration should be avoided as far as possible.

3. 油池潤滑(亦稱油浴潤滑)
在一個大小合適的鏈箱中(使用過的已磨損伸長的鏈條不應能撞擊到箱邊)擁有足夠的潤滑油以使鏈板邊至滾子或套筒處能浸入,但浸入不宜過淺或過深。浸入過淺則潤滑不可靠;浸入過深則油易發熱氧化變質且攪油損失大。
There is just enough oil in a proper chain box for preventing the worn and elongated chain knocking against the casing wall to allow the chain plates to submerge into the bath up to the rollers or the bushings respectively. But immersion should not be too deep or too shallow .Too shallow immersion lubrication is not reliable. Too deep immersion may cause the oil to heat up and lead to untimely oxidation of the oil.

4. 油環潤滑(亦稱飛濺潤滑)
鏈條運行在油面上方。一個能浸入到油中約12.7mm ~ 25.4mm 的甩油盤利用離心力將油飛濺起來并利用箱體上的集油裝置持續不斷的導流到鏈條上。甩油盤的圓周速度應大于3m/s,一般不超過12.5m/s,最大不應超過40m/s。當鏈條寬度超過127mm時,應在鏈輪兩側都裝甩油盤。

With this type of lubrication, the chain operates above oil level. A disk submerging into the lower oil level, the depth is about 12.7mm-25.4mm, Peripheral velocity between min. 3m/s and max. 40m/s, normally not bigger than 12.5m/s, centrifuges oil against the casing walls from where it continuously runs down onto the chain via drip rails. The disk should be mounted on both sides of sprocket when the chain width above 127mm.

5. 強制潤滑(亦稱壓力潤滑)
此潤滑方式適用于高速重載型傳動。通過油泵和注油管強制供油潤滑并起到循環冷卻鏈條的效果。噴油嘴應布置在鏈條與鏈輪的嚙入處且數目應比鏈條排數多一個以使其對準每列鏈板的間隙處。

This type of lubrication is suitable for high-speed and heavy-duty type drives. Force feed lubrication is carried out to realize the circulating cooling of chains by means of oil pump and oil feeding pipe .The spray nozzles should be situated near the gearing places of chain and sprocket, and the nozzle number should be one more than the chain strands number to make them aim at the gap of each row link plate.

 

 

 

 

 

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