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Manufacturing method of carbon brush used for locomotive traction motor

A traction motor and carbon brush technology, which is applied in the field of preparation of carbon brushes for locomotive traction motors, can solve the problems of commutation performance limitation, carbon brush temperature rise, carbon brush temperature rise, etc., and achieves improved wear resistance and uniform performance. , the effect of improving orientation

Active Publication Date: 2016-10-19
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 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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  • Manufacturing method of carbon brush used for locomotive traction motor
  • Manufacturing method of carbon brush used for locomotive traction motor
  • Manufacturing method of carbon brush used for locomotive traction motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] 1. Preparation of soft carbon black powder

[0084] 1-A) Prepare materials according to the following weight ratio (kg):

[0085]

[0086] 1-B) Add acetylene carbon black and stearic acid to a double paddle mixing pot preheated to 150°C, 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 a mixture material.

[0087] 1-C) Take out the mixed material, cool it naturally to 80° C., and press it into a material column; wherein, the pressure of the pressing treatment is 5 MPa.

[0088] 1-D) Put the material column in the roasting furnace, isolate the air and roast, the maximum temperature is 1200 ° C for 10 hours, and the roasting curve is 288 hours; after cooling out of the furnace, put the roasted material column into the graphitization furnace, and use pitch As a filler, it can be rapidly graphitized when electrified (the temperature can be raised freely), and it can ...

Embodiment 2

[0119] 1. Preparation of soft carbon black powder

[0120] In addition to step 1-A) according to the following weight ratio preparation (kg):

[0121] Acetylene Black 95

[0122] Stearic acid 0.4

[0123] Medium temperature asphalt 24

[0124] Except coal tar 24, all the other are identical with embodiment 1.

[0125] 2. Preparation of carbon brush blanks

[0126] 2-A) Prepare raw materials (kg) according to the following weight ratio:

[0127]

[0128] 2-B) Mixed extrusion treatment

[0129] Preheat the second-ninth section of the twin-screw extrusion mixer cavity to 110°C, add the raw materials in step 2-A) to the first section of the twin-screw extrusion mixer at a constant speed, and continue Raise the temperature to 200°C and carry out mixing and extrusion treatment to obtain the mixed material;

[0130] 2-C) The first grinding treatment

[0131] The mixed material was pulverized to 74 μm in a Raymond mill, and then pulverized to 48 μm in a fluidized bed jet mi...

Embodiment 3

[0143] 1. Preparation of soft carbon black powder

[0144] In addition to step 1-A) according to the following weight ratio preparation (kg):

[0145] Acetylene carbon black 105

[0146] Stearic acid 0.6

[0147] Medium temperature asphalt 26

[0148] Except coal tar 26, all the other are identical with embodiment 1.

[0149] 2. Preparation of carbon brush blanks

[0150] 2-A) Prepare raw materials (kg) according to the following weight ratio:

[0151]

[0152]

[0153] 2-B) Mixed extrusion treatment

[0154] Preheat the second-ninth section of the twin-screw extrusion mixer chamber to 130°C, add the raw materials in step 2-A) to the first section of the twin-screw extrusion mixer at a uniform speed, and continue Raise the temperature to 210°C and carry out mixing and extrusion treatment to obtain the mixed material;

[0155] 2-C) The first grinding treatment

[0156] The mixed material was pulverized to 74 μm in a Raymond mill, and then pulverized to 48 μm in a ...

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Abstract

The invention discloses a manufacturing method of a carbon brush used for a locomotive traction motor. The method comprises the following steps of under a heating condition, carrying out mixed extrusion processing on a soft carbon black powder, spray carbon black, a pitch coke powder, a graphite powder, a pore-forming agent, a directional auxiliary agent, modified pitch and a lubricant so as to acquire a mixed material; carrying out grinding processing on the mixed material so as to acquire a first mixed powder; mixing the first mixed powder and carrying out flaking processing so as to acquire a sheet-shaped material; carrying out smashing and grinding processing on the sheet-shaped material so as to acquire a second mixed powder; blending the second mixed powder and then pressing the power into a carbon-brush pressed shape, and then successively carrying out roasting and graphitization processing so as to obtain the carbon brush. Breaking strength of the carbon brush manufactured through the above method is high, commutation performance is good and an allowable passing current density is large. The carbon brush is suitable for a diesel locomotive traction motor and is also suitable for an electric locomotive traction motor.

Description

technical field [0001] The invention belongs to the technical field of locomotives, and in particular relates to a method for preparing a carbon brush for a locomotive traction motor. Background technique [0002] Carbon brushes for traction motors of railway locomotives, as the core components of locomotive motors, have always been the most important research and development point of carbon brush manufacturers. Old carbon brush companies in various countries use their own unique product model characteristics to apply to various traction motors. However, the existing carbon brushes for locomotive traction motors cannot be applied to all types of locomotive traction motors due to different product performances, which brings a lot of inconvenience to locomotive users. However, my country's carbon brushes for locomotive traction motors almost still use the technological thinking of the 1960s, and there has been no major breakthrough for decades. [0003] Carbon brushes for loc...

Claims

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Application Information

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