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Post by John on Jul 13, 2012 14:04:12 GMT -5
I was looking at a Chinese webpage on their shearers, here's some of the specs, I'm not going to take the mickey out of the English as my Chinese is even worse... ;D
BUT, check the paragraph on bearings!!! Even they don't trust their own bearings....  Product Description Longwall Shearer MG750/1800-WD electric haulage coal shearer specification 1: Total machine is much motor drive, transversal arrangement, draw structure, mainframe is three section cast weld construction. 2: AC frequency conversion stepless speed regulation; Pin rail style no chain traction, constant power automatic speed control. 3: All shearer bearing are Sweden SKF series products4: The machine has the operation parameter display and alarm function 5: The coal mining machine has fault diagnosis, treatment, automatic memory storage, transmission and microcomputer control function.
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rac
Shotfirer.
Posts: 87
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Post by rac on Jul 13, 2012 14:36:03 GMT -5
hmm wondered how long it would before they did a copy of such as joy shearers.yeh makes you smile re - the bearings obviously not perfected that copy yet.  |
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Post by dazbt on Jul 13, 2012 15:32:02 GMT -5
The Chinese were already manufacturing copied Anderson shearers and other machinery almost 40 years ago, I visited a production workshop in the late 1970s and saw AB16 gearhead castings in production, much to the embarrassment of the Datong Group Engineers showing me around the place. Quite a number of AM500 shearers had been sold to China and it was taken for granted that the Chinese wouldn't be very long in copying them, so in the early 1980s Anderson decided to 'cut its losses' and negotiated a technology transfer deal that gave license for them to produce AM500 major component parts with the agreement that the more complex and critical components, such as hydraulic swashplate pumps and valvery were supplied by Anderson. Some of these Chinese made AM500 copies were actually tendered at much lesser prices and in competition to Anderson produced machines at least to Australian mines, not sure if any were ever accepted or actually sold to other countries.
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Post by dazbt on Jul 13, 2012 15:52:17 GMT -5
Re. the 'Sweden SKF bearings', these will very likely be of Chinese manufacture anyway, I believe that SKF bearings are manufactured under license in China, in much the same way that much of the world's engineering and electronic components are. It might come as a bit of a surprise to some to know that in the 1970s the NCB made a a decision that the majority of bearings used and held in their central stores were replaced by Italian products.
China manufacture bearings of International standard quality, many of the famous bearing manufacturer's named products are made there, including SKF, NSK, Timken and the ultimate INA.
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Post by John on Jul 13, 2012 15:57:38 GMT -5
Re. the 'Sweden SKF bearings', these will very likely be of Chinese manufacture anyway, I believe that SKF bearings are manufactured under license in China, in much the same way that much of the world's engineering and electronic components are. It might come as a bit of a surprise to some to know that in the 1970s the NCB made a a decision that the majority of bearings used and held in their central stores were replaced by Italian products. China manufacture bearings of International standard quality, many of the famous bearing manufacturer's named products are made there, including SKF, NSK, Timken and the ultimate INA. |
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Post by John on Jul 13, 2012 15:59:08 GMT -5
We can still get new "old stock" Soviet bearings fairly cheaply over here Daz, and they seem pretty high quality.
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Post by dazbt on Jul 16, 2012 5:25:46 GMT -5
Re. the 'Sweden SKF bearings', these will very likely be of Chinese manufacture anyway, I believe that SKF bearings are manufactured under license in China, in much the same way that much of the world's engineering and electronic components are. It might come as a bit of a surprise to some to know that in the 1970s the NCB made a a decision that the majority of bearings used and held in their central stores were replaced by Italian products. China manufacture bearings of International standard quality, many of the famous bearing manufacturer's named products are made there, including SKF, NSK, Timken and the ultimate INA. Are you sure they didn't have Romania Bearings stamped on em J?  |
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Post by John on Jul 16, 2012 6:59:31 GMT -5
Well I'm glad I replaced my trucks front bearings with ones stamped "Made In Rumania" then... I told the missus they had to SKF, Timken, anything other than Made In China....All they had was Rumanian bearings... ;D Are you sure they didn't have Romania Bearings stamped on em J? |
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Post by dazbt on Jul 16, 2012 7:14:32 GMT -5
Are you sure they didn't have Romania Bearings stamped on em J? Reading between the lines, you might not have to do any pulling, there's just a chance that they'll come off on their own accord ............................. www.made-from-india.com/showroom/romania/not that I've anything against anything made in India mind, things could well have altered over the last 20 years ;D ;D ;D ;D ;D ;D ;D |
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Post by John on Jul 16, 2012 7:53:36 GMT -5
Could be, but I'm not pulling the wheels off to find out... ;D Reading between the lines, you might not have to do any pulling, there's just a chance that they'll come off on their own accord ............................. www.made-from-india.com/showroom/romania/not that I've anything against anything made in India mind, things could well have altered over the last 20 years ;D ;D ;D ;D ;D ;D ;D No, they were made in Rumania Daz, they looked and sounded pretty good and are still in place... I have read horror stories of Chinese taper roller bearings collapsing while the driver was cornering and end up rolling their vehicle...Scary!! I have a Chinese made PTO generator for my tractor as emergency power for when we ever lose power. I fully intend to replace all the gearbox bearings and seals with bearings made in other countries. 3000 plus revs on the output shaft scares the hell out of me on Chinese bearings.. |
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