Tackifying particle for tackifying rail transit wheel-rail interface, and preparation method thereof

A rail transit and particle technology, applied in locomotives and other directions, can solve the problems of increased wheel and rail wear, surface damage, and increased railway maintenance costs, and achieve the effect of avoiding wheel and rail wear and increased damage.

Active Publication Date: 2020-05-15
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the hardness of sand particles is much higher than that of the wheel-rail material, the sand particles entering the wheel-rail interface will not only increase the adhesion coefficient, but also cause adverse effects such as increased wheel-rail wear and surface damage, and increase railway maintenance costs.

Method used

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  • Tackifying particle for tackifying rail transit wheel-rail interface, and preparation method thereof
  • Tackifying particle for tackifying rail transit wheel-rail interface, and preparation method thereof
  • Tackifying particle for tackifying rail transit wheel-rail interface, and preparation method thereof

Examples

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preparation example Construction

[0023] A method for preparing tackifying granules used for tackifying the wheel-rail interface of rail transit, comprising the following steps:

[0024] Step 1: adding silicon dioxide powder into water to form a premix; the mass fraction of the silicon dioxide powder in the premix is ​​40-60wt.%; the silicon dioxide powder is quartz powder, and the particle size range is 1-30 μm.

[0025] Step 2: Spray-dry the premix solution obtained in step 1 to form a green particle body; add a binder to the premix solution to agglomerate the silica powder during the spray drying process to form a green particle body with a particle size that meets the requirements. The binder is sodium silicate, and the amount added is 2 to 5% of the mass of the silica powder used.

[0026] Step 3: Sintering the pellet green body obtained in Step 2 to obtain finished pellets. The granule green body is sintered in an atmospheric pressure sintering furnace, and the temperature is raised to 1200 °C with the ...

Embodiment

[0028] Choose quartz powder with a particle size range of 1-30 μm as the material. At room temperature, mix 1 kg of material with 1.5 kg of water to prepare a premixed solution with a mass fraction of 40wt.%. After stirring the premixed solution for 20 minutes, add 50 g of sodium silicate and continue stirring 10min.

[0029] The uniformly stirred premixed liquid is made into green granules on a pressure spray dryer, and the green granules are heated in a sintering furnace at 20°C / min to 1200°C, kept at this temperature for 2 hours, then taken out and naturally cooled to room temperature to obtain The final finished pellets.

[0030] figure 1 The comparison chart of the viscosifying particles prepared in the above example and the sand particles of the same size shows that the shape of the particles prepared in this example is more regular and close to a sphere. Its characteristics are different from the crystal characteristics of sand particles, showing the characteristics o...

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Abstract

The invention discloses a tackifying particle for tackifying a rail transit wheel-rail interface, and a preparation method thereof. The preparation method comprises the following steps: 1, adding silica powder into water to form a premixed liquid; 2, carrying out spray drying on the premixed solution obtained in step 1 to form a particle green body; and 3, sintering the particle green body obtained in step 2 to obtain the finished product particle. The tackifying particle prepared by the invention can effectively avoid the problems of wheel rail wear and damage aggravation caused by hard particles in the tackifying process while meeting the wheel rail tackifying requirement; and tests show that the wear rate of the wheel rail material in the tackifying process is reduced by 70% compared with the traditional sand particle tackifying process, and the wheel rail sample has a smooth surface and has no obvious damage such as particle indentation and the like.

Description

technical field [0001] The invention relates to the technical field of rail transit sand spreading and viscosity increasing, in particular to a viscosity-increasing granule for increasing the viscosity of the wheel-rail interface of rail traffic and a preparation method thereof. Background technique [0002] The adhesion characteristics of the wheel-rail interface are the key factors affecting the safe and efficient operation of the locomotive. When pollutants such as water, oil, and leaves appear on the rail surface, an excessively low adhesion coefficient will lead to low adhesion problems such as excessive braking distance of the locomotive, train delay, and wheelset slipping / idling. Viscosification in the form of sand. [0003] At present, the viscosity-increasing particles used for railway sand spreading and viscosity-increasing are river sand or silica sand particles, with a particle size of 0.5-2mm. Since the hardness of sand particles is much higher than that of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/622B61C15/10
CPCB61C15/10C04B35/14C04B35/622C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/95C04B2235/96
Inventor 师陆冰王文健王超丁昊昊李群郭俊刘启跃周仲荣
Owner SOUTHWEST JIAOTONG UNIV
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