Preparation method of motor train unit earth return brush

A technology of reflow device and grounding brush, applied in the direction of brush manufacturing, circuit, connection, etc., can solve the problems of long service life and reduced contact pressure, and achieve the effects of long service life, reduced contact pressure and excellent electrical conductivity

Active Publication Date: 2017-01-11
SUZHOU DONEKA NEW MATERIALS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems existing in the grounding brush used in the grounding return device of the EMU, the present invention provides a high-power (extremely large current), high-speed (large linear velocity of the brush), and high safety and reliability characteristics of the EMU. A method for preparing a grounding brush for an EMU grounding return device, the brushes prepared by the method have reduced contact pressure for a pair of brushes, good lubricity, and long service life

Method used

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  • Preparation method of motor train unit earth return brush
  • Preparation method of motor train unit earth return brush
  • Preparation method of motor train unit earth return brush

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 1. Raw material preparation

[0076] Raw materials are prepared according to the following proportions by weight:

[0077]

[0078] 2. Prepare the premix

[0079] At room temperature, add the prepared high-purity electrolytic copper powder, tin powder, zinc powder, purified graphite powder, molybdenum disulfide and copper-coated graphite fiber into the V-type mixer, and mix in a closed manner for 30 minutes to obtain the first premixed material;

[0080] Then spray the nano-alumina alcohol solution (25% by mass fraction) into the first mixed material that has been mixed, and airtightly mix for 60 minutes to obtain the second premixed material;

[0081] Finally, the zinc stearate was added to the mixed second mixture, and the mixture was airtightly mixed for 60 minutes to obtain a premix.

[0082] 3. Drying treatment

[0083] The premixed material was placed in a vacuum drying oven and dried at 30° C. for 2 h to remove the liquid substances therein.

[0084] 4. C...

Embodiment 2

[0095] 1. Raw material preparation

[0096] Raw materials are prepared according to the following proportions by weight:

[0097]

[0098] 2. Prepare the premix

[0099] At room temperature, add the prepared high-purity electrolytic copper powder, tin powder, zinc powder, purified graphite powder, molybdenum disulfide and copper-coated graphite fiber into the V-type mixer, and mix in a closed manner for 35 minutes to obtain the first premixed material;

[0100] Then spray the nano-alumina alcohol solution (25% by mass fraction) into the first mixed material that has been mixed, and mix in an airtight manner for 70 minutes to obtain the second premixed material;

[0101] Finally, the zinc stearate was added to the mixed second mixture, and the mixture was airtightly mixed for 50 minutes to obtain a premix.

[0102] 3. Drying treatment

[0103] The premix was placed in a vacuum drying oven, and dried at 25° C. for 2.5 hours to remove the liquid substances therein.

[010...

Embodiment 3

[0115] 1. Raw material preparation

[0116] Raw materials are prepared according to the following proportions by weight:

[0117]

[0118] 2. Prepare the premix

[0119] At room temperature, add the prepared high-purity electrolytic copper powder, tin powder, zinc powder, purified graphite powder, molybdenum disulfide and copper-coated graphite fiber into the V-type mixer, and mix in an airtight manner for 40 minutes to obtain the first premixed material;

[0120] Next, spray the nano-alumina alcohol solution (25% by mass fraction) into the mixed first mixture, and mix in an airtight manner for 80 minutes to obtain the second premix;

[0121] Finally, the zinc stearate was added to the mixed second mixture, and the mixture was airtightly mixed for 40 minutes to obtain a premix.

[0122] 3. Drying treatment

[0123] The premix was placed in a vacuum drying oven, and dried at 20° C. for 3 h to remove the liquid substances therein.

[0124] 4. Compression treatment

[01...

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Abstract

The present invention provides a preparation method of a motor train unit earth return brush. The preparation method comprises the steps of uniformly mixing the high purity electrolytic copper powder, the tin powder, the zinc powder, the purification graphite powder, a lubricant, a copper-coated graphite fiber, the nanometer aluminum oxide and a release agent at a normal temperature to prepare a pre-mixed material, drying and then pressing the pre-mixed material to prepare a brush pressed blank, sintering the brush pressed blank to prepare a brush blank material, carrying out the brush finished product processing on the brush blank material after the aging treatment to obtain a brush finished product, wherein the lubricant is selected from tungsten sulfide and / or molybdenum disulfide, and the release agent is the stearate. According to the brush prepared by the method of the present invention, the contact voltage drop of a pair of brushes is low, an allowable working current is large, the rigidity is high, a wear rate and a friction coefficient are low, an allowable line speed is high, and the operation requirements of a motor train unit can be satisfied completely.

Description

technical field [0001] The invention relates to a method for preparing a brush, in particular to a method for preparing a brush for a grounding return device of an EMU, and belongs to the technical field of electric locomotives. Background technique [0002] On a locomotive powered by electricity, there must be a current-receiving part (pantograph slide) that obtains power, and a grounding part that forms a loop (grounding return device brush, referred to as the grounding brush) to prevent current from flowing Electrical corrosion or burning of bearings when bearing housings, bearing ends, wheels, and rails form a loop. In the past, due to the relatively small motor power of electric traction locomotives, the grounding brush used was a ring-shaped brush with a diameter of 50mm, an inner hole diameter of 10-16mm, and different heights. The grounding brush was installed in the middle of the bearing end. Because the power (current) and speed of the locomotive are relatively lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R43/12H01R39/22
Inventor 顾志平朱约辉
Owner SUZHOU DONEKA NEW MATERIALS CORP LTD
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