Parsons Mining Chain is now exclusively manufactured in China for Ellton Longwall by the Zhangjiakou Chain Company part of the China Mining Equipment Group (CME).  Founded in 1958, Zhangjiakou is the leading manufacturer of mining chain and components for the Chinese Mining industry.  China currently produces about 2.5 B tons of coal mostly by longwall mining, so its experience base is significant.

Zhangjiakou began working with the Parson Chain Company UK in 1995, and it eventually took over production for all Parsons Mining Chain. As a result, new improved manufacturing and heat treatment processes have been introduced.  Recent investments in unique process equipment and quality management systems have enabled us to provide the high quality chain systems the worlds mining industry demands. An example of this quality is evident in the fact that there has not been a single Parsons Chain warranty claim in the last ten years!

In 2007 CME and Ellton Longwall added Parsons Mining Chain to its product catalog including its patented Xtra chain with its higher tensile strength, longer fatigue life and increased toughness properties compared to DIN standard chain.

CORX chain with a patented alloy steel material was developed to overcome the effects of even the most corrosive mining conditions. Unlike chain which is surface galvanized, COR-X chains properties are inherent in the whole link which means the effects will not wear off and will last the life of the Chain.

Ellton Longwall is the exclusive distributor of Parsons Mining Chain in Australia and the USA.

Please enjoy browsing our site.  To receive our catalog go to our “catalog” tab or email us at info@ParsonsChain.com.

 

COR-X Mining Chain COR-X chain is made from an Exclusive, patented vanadium, nickel, chromium, and molybdenum alloy that increases chain life substantially in corrosive environments.  Breaking and operating force is increased 10%.  Notch impact is increased 40% and resistance to Stress Corrosion Cracking (SCC), is increased 350% compared to regular chain (DIN 22252). The alloy steel material specification for COR-X chain was developed and patented in 1997 to overcome the effects of the most corrosive mining conditions.

Parsons COR-X chain unique vanadium, nickel, chromium, and molybdenum alloy reduces stress corrosion cracks and resists corrosive environments significantly. Production runs of more than 12 million short tons have been recorded with our 48 x 152 mm chain.

High levels of acidity, conductivity, soluble chlorates and sulfates in the mine water will inevitably lead to the development of surface corrosion pitting which can result in premature failure due to the effects of corrosion fatigue or stress corrosion cracking.



Unlike chain which is surface galvanised, COR-X chain properties are inherent in the whole link, will not wear off and last the life of the chain.

Parsons COR-X mining chains are thus virtually immune to the effects of corrosion pitting and have proven reliability on many of the world’s key conveyor installations. And it is again available in the USA, after an absence of over three years.

Round Link COR-X Mining Chains - Mechanical Properties

Nominal Size d x t	Reference Number	Test Force  TF	Breaking Force - BF	Operating Force - WF	Bend Test Deflection – min	Fatigue Cycles		Wt.
mm		kN	kN	kN - max	mm	min	max	Kg
30 x 108*	30108RCR	848	1240	777	26			18.0
34 x 126*	34126RCR	1090	1600	1000	34			22.7
38 x 126	38126RCR	1360	2000	1250	38	125,000	275,000	26.7
38 x 137	38137RCR	1360	2000	1250	38			29.0
38 x 146	38146RCR	1360	2000	1250	38			27.6

*Smaller sizes of mining chain may not be in inventory and require longer lead times to order.

Reference Numbering System

38146 R C R

Size and Pitch Round Link COR-X Specification Rust Preventative

Total elongation at test force – 1.6% max. Total elongation at fracture – 14% min. Impact KV Test – 50J. min. Refer to DIN22252:2001 for verification and procedures.

Compact COR-X Mining Chains - Mechanical Properties

Nominal Size d x t	Reference Number	Test Force  TF	Breaking Force - BF	Operating Force - WF	Bend Test Deflection – min	Fatigue Cycles		Wt.
mm		kN	kN	kN - max	mm	min	max	kg
34 x 126*	34126CCRW/F	1090	1600	1000	34			22.7
38 x 126	38126CCRW/F	1360	2000	1250	38			30.0
38 x 137	38137CCRW/F	1360	2000	1250	38	125,000	275,000	29.0
38 x 146	38146CCRW/F	1360	2000	1250	38			27.6
42 x 146	42146CCRW/F	1680	2440	1520	42			37.0
48 x 152	48152CCRW/F	2170	3180	1990	48			46.8

*Smaller sizes of mining chain may not be in inventory and require longer lead times to order.

Reference Numbering System

48152 C D R W F

Size and Pitch Compact Link DIN Quality Rust Preventative Welded End Links Forged (Vertical) End Links

Total elongation at test force – 1.6% max. Total elongation at fracture – 11% min. Impact KV Test – 50J. min. Fatigue Test – 70,000 cycles min. Mean stress 150N/mm2. Amplitude ±100N/mm2 Refer to DIN22252:2001 for verification and procedures.

Xtra Mining Chain Parsons Xtra mining chains have been developed using Parsons Chain’s expertise in materials technology and heat treatment techniques. First developed 20 years ago as ‘Enhanced’ chain the range is reliable and well proven at those mines where operational conditions are suitable for high specification chain. Xtra chain offers higher tensile strength, longer fatigue life and increased toughness properties when compared with chain conforming to the latest DIN specifications for round and flat link chain. Optimum hardness profiles for each link reduce interlink wear giving significantly increased operational life.

Innovative technology and unique heat treatment process give Parsons’ Xtra chain higher strength, longer fatigue life and enhanced toughness qualities.  In fact, Xtra chain can outperform regular DIN Standard chain by up to 70%

Round Link Xtra Mining Chains - Mechanical Properties

Nominal Size d x t	Reference Number	Test Force  TF	Breaking Force - BF	Operating Force - WF	Bend Test Deflection – min	Fatigue Cycles		Wt.
mm		kN	kN	kN - max	mm	min	Typical	Kg
22 x 86	220896RXR	525	745	456	22			9.5
22 x 92	22092RXR	733	1040	637	26			13.7
30 x 108	30108RXR	976	1390	848	30	200,000	>500,000	18.0
34 x 126	34126RXR	1250	1780	1090	34			22.7
38 x 137	38137RXR	1560	2220	1360	38			29.0

Reference Numbering System

38137 R X R

Size and Pitch Round Link Xtra Specification Rust Preventative

Total elongation at test force – 1.6% max. Total elongation at fracture – 14% min. Impact KV Test – 50J. min. Refer to DIN22252:2001 for verification and procedures.

Compact Xtra Mining Chains - Mechanical Properties

Nominal Size d x t	Reference Number	Test Force  TF	Breaking Force - BF	Operating Force - WF	Bend Test Deflection – min	Fatigue Cycles		Wt.
mm		kN	kN	kN - max	mm	min	Typical	kg
34 x 126	34126CXRW/F	1250	1780	1090	34			22.7
38 x 126	38126CXRW/F	1560	2220	1360	38			30.0
38 x 137	38137CXRW/F	1560	2220	1360	38	125,000	>200,000	29.0
38 x 146	38146CXRW/F	1560	2220	1360	38			27.6
42 x 146	42146CXRW/F	1910	2720	1660	42			37.0
48 x 152	48152CXRW/F	2500	3550	2170	48			46.8

Reference Numbering System

48152 C X R W F

Size and Pitch Compact Link Xtra Specification Rust Preventative Welded End Links Forged (Vertical) End Links

Total elongation at test force – 1.6% max. Total elongation at fracture – 11% min. Impact KV Test – 50J. min. Fatigue Test – 70,000 cycles min. Mean stress 150N/mm2. Amplitude ±100N/mm2 Refer to DIN22252:2001 for verification and procedures.

Parsons Compact Link mining chain was first manufactured in 1985 utilizing a forged vertical link. This configuration has been developed in all sizes up to 48mm and has significant advantages over a flattened wrought vertical link.

Parsons larger compact chains are formed and laced together with specially designed machinery to ensure continuous and consistently formed chain.
 
Parsons Compact mining chain may be manufactured to Xtra and DIN quality grades with dimensions generally in accordance with DIN 22255:2001.

Parsons Mining Chain Dimensions

Nominal Size	Diameter		Thickness	Pitch		Width
mm	d	Tolerance	e	t	Tolerance	inside B1 min	Outside B2 max	inside B3 min	Outside B4 max
34 x 126	34	± 1.0	38	126	± 1.3	38	109	38	97
38 x 126	38	± 1.1	42	126	± 1.3	42	121	42	110
38 x 137	38	± 1.1	42	137	± 1.4	42	121	42	110
38 x 146	38	± 1.1	42	146	± 1.5	42	121	42	110
42 x 146	42	± 1.1	48.5	146	± 1.5	46	133	46	115
48 x 152	48	± 1.5	56	152	± 1.5	163	163	53	127

DIN 22255:2001 – Flat Link Steel Chains – Mechanical Properties

Nominal Size     d x t	Reference Number	Test Force  TF	Breaking Force - BF	Operating Force - WF	Bend Test Deflection – min.	Wt
mm		kN	kN	kN - max	mm	kg
34 x 126	34126CDRW/F	1090	1450	907	34	22.7
38 x 126	38126CDRW/F	1360	1820	1130	38	30
38 x 137	38137CDRW/F	1360	1820	1130	38	29
38 x 146	38146CDRW/F	1360	1820	1130	38	27.6
42 x 146	42146CDRW/F	1660	2220	1380	42	37
48 x 152	38152CDRW/F	2170	2900	1810	48	46.8

48152 C D R W F

Size and Pitch Compact Link DIN Quality Rust Preventative Welded End Links Forged (Vertical) End Links

Total elongation at test force – 1.6% max. Total elongation at fracture – 11% min. Impact KV Test – 50J. min. Fatigue Test – 70,000 cycles min. Mean stress 150N/mm2. Amplitude ±100N/mm2 Parsons Chain – 125,000 cycles min. Typically > 225,000 cycles.

Parsons round link conveyor chains may be manufactured to Xtra or DIN quality grade 2 specifications.  All chains meet the dimensional requirements in DIN 22252:2001.

Din 22252:2001 – Round Link Steel Chains
Calibrated and tested for conveyors and haulage systems

Nominal Size d x t	Diameter		Pitch		Width		Gauge Length
mm	d	Tolerance	t	Tolerance	inside     B1 min	Outside   B2 max	5 x t	Outside  B4 max
14 x 50	14	± 0.4	50	± 0.5	17	48	250	± 1
18 x 64	18	± 0.5	64	± 0.6	21	60	320	± 1
19 x 64.5	19	± 0.6	64.5	± 0.6	22	63	322.5	± 1
22 x 86	22	± 0.7	86	± 0.9	26	73	430	± 1
26 x 92	26	± 0.8	92	± 0.9	30	85	460	± 1
30 x 108	30	± 0.9	108	± 1.1	34	97	540	± 1.2
34 x 126	34	± 1	126	± 1.3	38	109	630	± 1.3
38 x 137	38	± 1.1	137	± 1.4	42	121	685	± 1.4

DIN 22252:2001 Round Link Steel Chains
Mechanical Properties for Quality Grade 2 Chain

Nominal Size     d x t	Reference Number	Test Force  TF	Breaking Force - BF	Operating Force - WF	Bend Test Deflection – min.	Wt
mm		kN	kN	kN - max	mm	kg
14 x 50	14050RDR	185	246	154	14	4
18 x 64	18064RDR	305	407	254	18	6.6
19 x 64.5	19064RDR	340	454	283	19	7.6
22 x 86	22086RDR	456	608	380	22	9.5
26 x 92	26092RDR	637	850	531	26	13.7
30 x 108	30108RDR	848	1130	707	30	18
34 x 126	34126RDR	1090	1450	907	34	22.7
38 x 137	38137RDR	1360	1820	1130	38	29

38137 R D R

Size and Pitch Round Link DIN Quality Grade 2 Rust Preventative

Total elongation at test force – 1.6% max. Total elongation at fracture – 11% min. Impact KV Test – 50J. min. Fatigue Test – 70,000 cycles min. Mean stress 150N/mm2. Amplitude ±100N/mm2 Parsons Chain – 125,000 cycles min. Typically > 275,000 cycles

Conveyor chains, scraper bars and connectors are consumable items and are subject to wear and possible damage with repeated use. Chain maintenance is of paramount importance in ensuring that chain life is maximized while ensuring there is a minimum risk of chain failures.

• Face alignment should be maintained as accurately as possible
• Faces which are out of line can cause uneven wear and elongation of the chain
• Minimize the degree of snaking behind the shearer which, if too tight will increase power requirements and wear in the chain.
• Implement a chain management program. This will ensure that all operatives are full trained and work to the best practices laid down in the conveyor manufacturer’s instructions.
• Follow maintenance procedures and keep up to date records.
• For each new conveyor installation create and maintain a “chain map.”

Chain maintenance practice is where mine operators have greatest control over chain performance with chain pre-tension being identified as the most significant factor in minimizing premature failure due to induced high strain rate conditions.  A summary of the key points is shown below; however the maintenance recommendations of the conveyor manufacturer must also be implemented.

• Check pre-tension on a daily basis especially during the first 2/3 weeks of running a new installation.
• Carry out a visual examination of the pan line prior to startup to ensure no obvious defects or problems.
• Always replace damaged scraper bars and connectors as soon as possible.
• Any damaged or broken chain should be removed and the adjacent chain checked for stretch. If this is indicated the links should be removed as soon as possible and if the chain is worn, replacement of both sides of the chain will be required to maintain chain matching.
• Check for damaged chain strippers and sprockets, replacing where necessary.
• Check the scraper bars for loose, missing or damaged fixings.
• Check the chain for wear or stretch. A chain will elongate due to either interlink wear or stretch (indicating overload) or both.  
• 1. Chain which has stretched has been overloaded and plastically deformed such that the overall length of the link has been permanently increased. This may occur in a number of adjacent links which can cause a chain mismatch. In this instance the section should be replaced and if the chain is worn the replacement of both sides will be required to maintain chain matching.
• 2. Normally chain stretches elastically and returns to its normal pitch when unloaded. Interlink wear increases the pitch of the chain without any change to the outside dimensions of the links but still results in an increase in the overall chain length.
• 3. A chain pitch increase of up to 2.5% is generally acceptable.

In order to monitor the effects of interlink wear and stretch Ellton Longwall has introduced a special measuring caliper which can be used to check conveyor chain from 26 mm up to 48 mm in either round or compact configurations.

The wear extension chart can be seen at: http://www.elltonlongwall.com.au/index.php/Operation-and-Maintenace.html
 


Accurate matching of pairs of chain is vital for the successful operation of the conveyor. Parsons match each pair on a link by link basis to ensure good flight bar alignment and bar stability in the line pan. The leading ends of the matched pair are color coded and metal tallies are attached showing a unique identification number for each length. Additionally plastic labels are attached to each length with details of the difference in match between the lengths and further guidance on matching.

Sizes up to 42mm are supplied with the pair in one box while 48mm and above are supplied in one length per box. In this instance there is additional coding information on the labels and on the top and side of each box to ensure correct lengths are put together as the pair. The ends which must be aligned side by side are clearly indentified and the matched pairs must never be separated. The table below shows the preferred matched lengths and weights available.

A table showing matched pair data may be seen at: http://www.elltonlongwall.com.au/index.php/Matching-and-Installation.html

Chain Installation Optimum chain performance can only be achieved provided the matched pairs are correctly assembled to the flight bars and then installed in a planned manner. This will ensure that the difference between sides is minimized ensuring from initial startup that tensions are under control. Ensure a good straight face line to minimize differential pre-tensions. Arrange the matched pairs such as the longest length is placed next to the shortest length in the next assembly and continue this through the face build up. Create a chain map to identify each assembly and the degree of initial match. Ensure the connectors are assembled exactly to the instructions provided. Always install new sprockets and strippers when installing a new chain.

We can deliver pre-assembled, ready-to-run, matched pairs of chain with flight bars to your mine.

• Ensure the chain is not run without some form of lubrication when first installed as rapid interlink wear can take place if the chains are run dry.

• Chain pretensions need to be established at the values which prevent too much slack under full load. (Recommendations from the conveyor manufacturer must always be used.)

• Ensure the correct tensioning procedures are adopted for both AFC and BSL conveyors and that pre-tension values are checked on a daily basis to establish actual values in each chain. This is especially critical in the first few weeks of operation as the chain tends to bed in and pan joints close up.

The Ellton Chain Caliper is an accurate and simple tool used for measuring average elongation within a chain drive. With scheduled use it will also determine the rate of elongation (wear) on AFC and BSL Chains. It can also be used to identify areas in a chain drive with abnormal elongation and matched chain length mismatch.


Ellton Chain Calipers are available for immediate shipment



Recommended Chain Mapping Procedure

• Identify connecting links within chain
• Count number of links within chain sections. (Connecting link to connecting link)
• Note chain section length in links
• Select 5 link lengths within chain section (3 or 7 link sections can also be used with a recalculation of gauge length).
• Clean crown ends of links to be measured.
• Place chain gauge over section at the highest point on crown.
• Tool legs should sit on top of vertical links.
• Close gauge until a tight fit.
• Take reading from inside edge of siding arm.
• Record measurement.
• This process should be repeated along the lengths of matched chain.
• The more readings taken from any chain length will provide a better average elongation.
• Average readings over each length of chain.
• Refer to chain gauge sheet included with each tool to determine average elongation.
• Large variance in measurements between two strands of chain could indicate mismatch of chain set.

For best possible readings and wear rate predictions the first reading should be taken when the chains are first installed and tensioned. Subsequence readings should be taken on a planned basis, weekly, monthly or based on tonnes conveyed. These reading when graphed will provide a predictive maintenance tool. For best results and maximum life of all drive components chains should be changed out at 3% average elongation.