Crawler Crane Drive Chain

VM^® Crawler Crane Drive Chain Advantage

01

Standard

Using a combination of hot pressing and annealing, followed by cold pressing processes, the chain plate pitch holes are meticulously created through advanced punching and squeezing techniques. This ensures the precision and durability of the crane drive chain. The chain plates undergo comprehensive heat treatment to significantly bolster their strength, while the pin shafts benefit from a dual treatment approach involving integral heat and high-frequency surface treatments. This meticulous process not only meets but exceeds ISO standards, achieving a tensile strength that surpasses 1.15 times the minimum requirement. Additionally, our roller chain sprockets conform to esteemed standards such as ISO 3512, ASME B29.10, and DIN 8182, ensuring reliability and compliance across various industrial applications.

02

Structure

The sprocket chain with bent plates features a unique structural design characterized by bent plate linkages. This design allows the crane sprocket chain to absorb substantial impact loads through the bending of the crawler crane chain plates. By increasing the length of the bright band on the aperture, the contact area between the crane chain plates and the pin shaft is enhanced, thereby improving the disengagement force between them.

03

Suitable Site

It is suitable for applications in harsh environments such as low speed, large load, dust, and the two sprockets are not easy to be coplanar. ‌This kind of crane chain is mainly used in larger machinery such as mining, ‌metallurgy, and ‌engineering machinery, and can withstand heavy working conditions. ‌In addition,‌heavy-duty bending plate chains are available in various models,‌including 2512 heavy-duty bending plate chain and 1115 heavy-duty bending plate chain, etc.‌These drive chains are available in single-row, ‌double-row and multi-row designs, and are suitable for different applications. transmission requirements. ‌Compared with gear transmission, ‌heavy-duty bending chain can be used in situations where the centers of the two axes are far apart. ‌It has the advantages of a larger transmission power and speed range. ‌It has a compact structure and long service life. Therefore, when high efficiency and high speed are required, ‌Widely used in the field of reliable transmission.

Link-belt: LS110C,LS118, LS108B, LS518

Manitowoc: M250, 4000, 4100, 3900,4500

American: 11320,9320, 9310,5299, 999c

Bucyrus: 30BS, 61RB,1200SC, 88B

Kobelco: P&H335, P&H325, P&H440, P&H320, P&H5300

Demag: CC2000, CC1200

Sumitomo: LS78RM, LS118RM, SC500M

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 factorService factor is listed in the following table.

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

Service factor table

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.

Chain drive part

Small sprocket speed ns=1351 r/min

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.

Rotary tillage chain part

Small sprocket speed ns=199 r/min

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.

Power rating graph ( A series roller chain and B Series)

The main characteristics of this power graph are as follows:

For drive Zs=19

Chain length: 120 pitches

Transmission ratio: 1 : 3 to 3 : 1

Service life of chain: 15000 hours

Note:

1.The rating power of multiple strand chain can be obtained by multiplying

the strand factor by the rating power of single strand chain

2.Small Sprocket Speed (r/min)

Strand factor table

5.Selection of lubrication

Lubrication of chain depends on the working environment, temperature, chain speed and so on.

1. Influence of working environment

For open drive such as combine chain, swather chain etc., grease lubrication is recommended.

For closed drive such as walking tractor chain transmission case etc., oil lubrication is recommended.

2. Influence of temperature

Application in the temperature range of -5℃ to +60℃ is recommended.

In winter, lower viscosity oil is recommended; But in summer, higher viscosity oil is recommended.

3. Influence of chain speed

The lubrication method is related to chain speed. Refer to the following chart for details, please.

Lubrication

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.

Lubrication and efficiency

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.

The below graph shows the efficiency of lubrication decrease with operating time.

Lubricant

First of all, the selection of an appropriate lubricant depends on the type of lubrication.

Just as the right diagram shows, low viscosity mineral oils are particularly suitable for chain drives.

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 choose, the most important issue is to ensure the lubricant flow into evenly (between pin and bush, between bush and roller)

Selection of lubrication method

Normally, there are five lubrication methods as below:

1. Manual lubrication

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 8 running hours). Lubricant colouration should be avoided as far as possible.

2. Drip lubrication

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. Oil bath lubrication (submerged lubrication)

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. Oil-ring lubrication (splash lubrication)

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. Force feed lubrication (pressure lubrication)

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.

1.Each sprocket in the driving system should have good coplanarity and the chain path should

always be smooth.

2.The sagging of chain loose side should be suitable and for the adjustable center distance

level and angle drive, the sagging should be 1%~2% of the center distance. For conditions of

vertical drive and under vibration load、reverse drive and dynamic brake ,the sagging should

be smaller. It’s very important to check and adjust the loose side sagging frequently in the

chain drive maintenance.

3.Good lubrication is also very important. Whichever lubrication method you choose, the most

important thing is to make the lubricating grease distribute evenly in each chain joint

clearance. If not necessary, avoid selecting big viscosity heavy oil or lubricating grease since it

will jam the clearances gone to joints friction surface with dust after a period of time. Periodically clean the roller chain and check its lubrication condition frequently. Disassembly the pin and bush, if necessary. If the friction surface is brown or dust color, it may be caused by insufficient lubrication.

4.Chains and sprockets should be always in good condition.

5.Frequently check the working surface of sprocket teeth, adjust or replace it when it’s excessively worn

As one of the leading crawler crane drive chain manufacturers and suppliers, our factory provides high quality crawler crane undercarriage parts for dealers. We warmly welcome you to wholesale quality crawler crane drive chain from our factory. for OEM service, contact us.