9, long-term safe storage of steel warehouse should use insulation system_JiangSu Hengxin Silo Equipment Co., Ltd

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9, long-term safe storage of steel warehouse should use insulation system

9, long-term safe storage of steel warehouse should use insulation system

  • Categories:FAQ
  • Author:
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  • Time of issue:2013-04-24 15:50
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概要:

9, long-term safe storage of steel warehouse should use insulation system

概要:

  • Categories:FAQ
  • Author:
  • Origin:
  • Time of issue:2013-04-24 15:50
  • Views:
Information

Summary

   I produced scraper mainly buried scraper conveyor and U-type scraper conveyor. Buried scraper conveyor models TGSS16 ~ TGSS100, the output is 22.5 ~ 1200t / h. U-type scraper conveyor with TGSU16 ~ TGSU63, yield of 22.5 ~ 260t / h. (Calculated as wheat ρ = 0.75t / m3). To better serve customers, improve their own manufacturing quality

I summed up the experience of the company, and scraper conveyor chain out of the accident to make the following analysis:

First, the accident cut off the chain
  1. manufacturing quality problems. The poor quality of the manufacturing of the round chain is one of the causes of the chain breakage. First, brittle fracture. The occurrence of brittle fracture has the following reasons: First, the welding joint, tensile residual stress and work stress superposition, and promote the occurrence and expansion of brittle fracture. Second, the welding angle deformation and wrong side. In the welding construction, due to manufacturing errors, the presence of faulty edge deformation, resulting in local stress concentration, resulting in additional parameters, reduce the fracture stress, the structure of brittle fracture. Third, the role of welding thermal cycle, so that the hardness of the joints increased, plasticity is reduced, likely to cause brittle fracture. Fragile fracture is caused by tensile stress, the brittle fracture of the ring chain generally occurs near the welded joint. Second, plastic fracture. The plastic fracture is mainly due to the poor plasticity of the parent material and the low shear strength. Plastic fractures are caused by shear forces. The poor quality of the pin of the same sleeve roller chain is also one of the causes of broken chain, because of its improper heat treatment will occur brittle fracture; welding joints at the residual stress superposition will promote the occurrence of brittle fracture.
  2. Work word drive. In the use of die forging chain, the ring and the ring between the use of cross-pin pin connection. This kind of die forging chain in the easy use of the work of the pin due to the loss of the position caused by the link out of the chain, resulting in fracture.
  Jumping teeth Jumping refers to the chain from the scraper conveyor head sprocket off. The teeth will cause the link to have an impact on the nose and sprocket teeth. Under normal circumstances, due to the design of a large safety load, although the impact is not easy to break the chain, but when the ring corrosion corrosion, tensile strength decreases, once the impact will be prone to fracture.
  4. Loading material too much or knot arch material squeeze scraper conveyor. Scraper chain at full load or overload start or frequent start, increasing the chain to withstand the dynamic tension, when it exceeds the limit or chain corrosion, wear, it is easy to break.
  5. pitch varies. Scraper chain work for some time, due to various reasons for the formation of pitch, and the distance between the two chains will make all the load concentrated in a chain. When the heavy start or chain corrosion, it may be broken.
  6. Chute wear. Wear a serious chute, the joints in the next slot is easy to scratch the scraper, so that the chain load surge. When the tension exceeds the limit or the chain corrosion wear, it is possible to pull the chain.
  7. The slot is not straight. The tank is not straight on the one hand makes the two chains of uneven force, serious chain tension concentrated on one side; when the tension exceeds the limit or chain corrosion wear, it is possible to pull the chain.
  8. The chain is too tight. The chain is too tight and is usually produced in tight chains. As the tight chain tension adjustment is too large, not only affects the normal operation of the scraper conveyor, shortening the service life, and when the scraper chain card, there is no room for buffer, increasing the chain tension load. When it exceeds the limit, it is possible to break the chain.
  9. Some of the material in the tank residue more. This condition allows the scraper conveyor to increase the friction at the next start-up, which increases the tension load of the link, which is easily broken at start-up.

Second, the nature of broken chain
  As the scraper conveyor working environment is more complex, so the scraper chain of natural damage is inevitable. Common natural damage methods are dynamic load, corrosion and wear 3 kinds:
  ① dynamic load. When the chain is in normal operation, there is a dynamic load. Because the head sprocket in the transmission chain when the speed has changed, there is acceleration or deceleration of the existence, so there is alternating load on the chain. Although this dynamic load is much smaller than the sudden impact, but the cycle of alternating action, but also cause a chain fatigue fracture of a major reason.
  ② corrosion. As the transport of some of the material itself will be some corrosive, these substances are easy to corrode the chain, so that the

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苏ICP备09055110号 Powered by: 300.cnEmail Login [Manager]

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