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A material for preparing carbon brushes for locomotive traction motors

A traction motor and carbon brush technology, applied in the field of materials for preparing carbon brushes for locomotive traction motors, can solve the problems of commutation performance limitation, carbon brush temperature increase, working current limitation, etc. The effect of uniformity and performance

Active Publication Date: 2018-12-07
SUZHOU DONEKA NEW MATERIALS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to achieve high current density and avoid excessive temperature rise of carbon brushes during work, materials with medium resistivity (40-50μΩM) are usually used to prepare carbon brushes, but their commutation performance is greatly limited; in order to To obtain good commutation, at the expense of working current density, carbon brushes are made of materials with high resistivity (55-65μΩM). Even if a good ventilation and cooling auxiliary system is prepared, the temperature rise of carbon brushes will not increase. Not optimistic
Usually, the commutation capability and the working current are opposite, because to improve the commutation capability, the resistivity of the material (commutation resistance) must be increased, and the increase of the resistivity will cause the temperature of the carbon brush to rise, and the working current will be severely limited.
[0006] Due to the constraints of production technology, at present, there is no carbon brush material in the foreign or domestic market that can be applied to both diesel locomotive traction motors and electric locomotive traction motors.

Method used

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  • A material for preparing carbon brushes for locomotive traction motors
  • A material for preparing carbon brushes for locomotive traction motors
  • A material for preparing carbon brushes for locomotive traction motors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] 1. Preparation of soft carbon black powder

[0086] 1-A) Prepare materials according to the following weight ratio (kg):

[0087]

[0088] 1-B) Add acetylene carbon black and stearic acid to a double-blade mixing pot preheated to 150℃, close the lid and mix for 20 minutes, then add medium temperature pitch and coal tar, close the lid and mix for 60 minutes, turn off the power to obtain the mixture material.

[0089] 1-C) Take out the mixed material, cool it to 80°C naturally, and press it into a column; wherein the pressure of the pressing process is 5MPa.

[0090] 1-D) Put the material column in the roasting furnace, isolate the air for roasting, keep the highest temperature at 1200℃ for 10 hours, and the roasting curve for 288 hours; after cooling out of the furnace, load the roasted material column into the graphitization furnace, and use pitch coke particles It is a filler, rapid graphitization (free temperature rise) when energized, and the maximum temperature is 2800℃ fo...

Embodiment 2

[0121] 1. Preparation of soft carbon black powder

[0122] Except for step 1-A) prepare materials according to the following weight ratio (kg):

[0123]

[0124] 2. Preparation of carbon brush blanks

[0125] 2-A) Prepare raw materials (kg) according to the following weight ratio:

[0126]

[0127] 2-B) Co-extrusion treatment

[0128] Preheat the second-ninth section of the double-screw extrusion mixer to 110°C, and add the raw materials in step 2-A) into the first-stage cavity of the double-screw extrusion mixer at a uniform speed. Continue The temperature is raised to 200°C and mixed and extruded to obtain a mixture;

[0129] 2-C) The first grinding treatment

[0130] Place the mixture in a Raymond mill to pulverize to 74 μm, and then place it in a fluidized bed jet mill to pulverize to 48 μm.

[0131] 2-D) Mixed and rolled

[0132] Preheat the twin paddle mixer to 155°C, put the mixed material crushed to 48μm into the twin paddle mixer, close the lid and continue to heat up and mix for ...

Embodiment 3

[0142] 1. Preparation of soft carbon black powder

[0143] Except for step 1-A) prepare materials according to the following weight ratio (kg):

[0144]

[0145]

[0146] 2. Preparation of carbon brush blanks

[0147] 2-A) Prepare raw materials (kg) according to the following weight ratio:

[0148]

[0149] 2-B) Co-extrusion treatment

[0150] Preheat the second-ninth section of the double-screw extrusion mixer to 130°C, and add the raw materials in step 2-A) into the first-stage cavity of the double-screw extrusion mixer at a uniform speed. Continue The temperature is raised to 210°C and mixed and extruded to obtain a mixed material;

[0151] 2-C) The first grinding treatment

[0152] Place the mixture in a Raymond mill to pulverize to 74 μm, and then place it in a fluidized bed jet mill to pulverize to 48 μm.

[0153] 2-D) Mixed and rolled

[0154] Preheat the twin paddle mixer to 160°C, put the mixture milled to 48μm into the twin paddle mixer, cover the lid and continue to heat up and ...

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Abstract

The invention discloses a material for preparing a locomotive traction motor carbon brush. The material comprises soft carbon black powder, sprayed carbon black, pitch coke powder, graphite powder, a pore forming agent, a directional auxiliary agent, modified asphalt and a lubricant. According to the present invention, the carbon brush prepared from the material has characteristics of high rupture strength, good direction change performance and high passing current density, and is used for the diesel locomotive traction motor and the electric locomotive traction motor.

Description

Technical field [0001] The invention belongs to the technical field of locomotives, and particularly relates to a material for preparing carbon brushes for locomotive traction motors. Background technique [0002] The material of carbon brushes is the prerequisite for the production of high-quality carbon brushes. Carbon brushes for railway locomotive traction motors, as the core components of locomotive motors, have always been the most important research and development point of carbon brush manufacturers. The established carbon brush companies in various countries have their own unique The carbon brushes produced by the characteristics of the material and model are used in various traction motors. However, the existing carbon brushes for locomotive traction motors are not suitable for all types of locomotive traction motors due to different product performance, which brings a lot of inconvenience to locomotive users. However, the carbon brush materials of traction motors for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/532C01B32/05
Inventor 顾志平朱约辉易文斌
Owner SUZHOU DONEKA NEW MATERIALS CORP LTD
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