JPS6237177Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a carbon resistance measuring device that can easily measure the specific resistance of a carbon brush in a short time.

Carbon brushes are used in DC rotary machines, and their performance can control the performance of the DC machine. In the manufacturing process of carbon brushes, large blocks are cut into small pieces, so in addition to the differences in specific resistance of each large block, variations in specific resistance due to positions such as inside or outside of one block can be avoided. There is no such thing.

Therefore, since there is a certain degree of variation among individual products, if these are sorted out and classified into quality categories, and products of similar quality are used together, the negative effects will be reduced. However, when measuring the resistivity of the cut material before processing the product, the influence of processing variations in the lead wire portion during lead wire attachment processing cannot be avoided.

Therefore, from the standpoint of quality control, measurements are currently performed after the lead wires are attached. Since it is difficult to automate measurement after lead wire attachment processing, there has been a desire for a device that can easily perform measurements in a short time.

The present invention was devised based on the above-mentioned demand, and the gist thereof is as stated in the claims of the utility model registration.

The present invention will be explained in detail below.

The specific resistance measuring device of the present invention performs measurement according to the principle shown in FIG. In Fig. 1, a constant current is applied to the brush A fixed on the table from the power supply E, and while the measuring needles P ₀ , P ₁ , P ₂ , and P ₃ are simultaneously pressed onto the brush, the switches S ₁ and S ₂ are turned on. , _S3 , the voltage drops between _P0 , _P1 , _P2 , and _P3 are measured with a voltmeter V, and the specific resistance of the brush is determined. Second
The entire embodiment of the present invention is shown in the figure, FIG. 3 shows the movable part, FIG. 4 shows the measuring plate part, FIG. 5 shows the carbon contact needle part, and FIG. The contact needle part of the dowel is shown.

A moving part stand 11 is mounted on the upper surface of the base stand 1 made of insulating material.
is mounted on a tower and held by movable part holders 20 on both sides so that it can be moved lightly from side to side. This moving part table includes a guide frame 12, a fixed receiving plate 16 made of insulating material, a contact receiving plate 17 made of insulating material, and an extruded metal fitting 1.
9. A contact plate 18 that contacts the carbon brush and one of the power sources, a spring 14 that adjusts the contact pressure, and a pressure adjustment screw 15 are mounted on the tower. The contact plate 18 is preferably made of silver-plated copper mesh.

Further, a fixed plate 2 is provided at the right end of the base 1 in order to press the contact plate 18 mounted on the moving part table 11 and the carbon brush to be measured.

Next, a measuring plate 8 made of an insulating material such as a Bakelite plate is attached to a carbon contact needle 21 and a contact spring 22.
is attached via the needle outer cylinder 9, and the dowel contact needle 23 is attached via the screw 10. Further, the measuring plate 8 is fixed to the base 1 by a support 7, and a stopper 6 is attached to the base 1 to press and hold the measuring plate 8 against the carbon brush. Connections to the power supply and to the measuring voltmeter are made by terminals 4,41. Furthermore, a terminal board 3 with a push switch 5 attached thereto is attached to a part of the base 1 in order to speed up the measurement.

Since the measurement is performed while the carbon brush is pressed, a fixing nut 13 is provided because it is necessary to fix the movable unit table 11 at the pressed position.

In addition, it is preferable to provide a positioning piece 24 on the base 1 in order to set the measurement point of the measurement carbon brush.

Next, the measurement procedure will be explained.

First, positioning is performed by fixing a positioning piece so that the center of the carbon brush to be measured matches the center of the measuring plate. For similar items, the measurement conditions will be uniform if you place the brush on the positioning piece and measure it. Place the carbon brush in the specified position and then tighten the fixing nut 13.
is loosened and the movable unit table is pushed in by hand to press the contact plate 18 between it and the fixed plate 2.

The pressing force for pushing the movable unit base 11 to a position where the gap between the contact plate holder 17 and the fixed receiving plate 16 becomes zero and tightening the fixing nut 13 at that position varies depending on the size and specifications of the brush, etc. There is a need to adjust it.

This is done by tightening or releasing the pressure adjustment screw 15 while checking the scale of the pressure gauge or spring scale to adjust the pressure of the spring 14 so that the gap is 0.
After pressing, the measuring plate 8 is held forward until it catches the claw of the stopper 6. The distance of the measuring needle is adjusted in advance to a measuring point that corresponds to the length of the carbon brush.

The carbon contact needles 21 are brought into even contact with the surface of the carbon brush via the contact springs 22.

Next, the terminal at the tip of the lead wire of the carbon brush is connected to the terminal 41, and a constant current is applied from the power source.

Next, by pressing the P ₁ , P ₂ , and P ₃ push switches, the slope voltage value due to each voltage drop is indicated to the voltmeter, and measurement can be performed in a short time. After measurement, the power supply is switched off and the stopper 6 is pressed. Gently pull to release the lock, lift the measuring plate 8, loosen the fixing nut 13, lift the movable unit stand 11, and replace the measuring brushes.If you follow this procedure in sequence, you can quickly measure the specific resistance of each carbon brush. Moreover, it can be operated accurately and easily even by an unskilled person.

As described above, the present invention greatly contributes to improving the quality control of carbon brushes, ensuring product uniformity, and saving labor.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the principle of the present invention, Fig. 2 is a perspective explanatory diagram of the embodiment, Fig. 3 is an explanatory diagram of the movable part base part, and Fig. 4 is the same, an explanatory diagram of the measuring plate part. FIG. 5 is an explanatory diagram of the carbon part contact needle, and FIG. 6 is an explanatory diagram of the dowel contact needle. Explanation of symbols, 1...Base, 2...Fixing plate, 3...
...terminal board, 4,41...terminal, 5...push switch, 6...stopper, 7...post, 8...
...Measuring plate, 9...Needle outer cylinder, 10...Screw, 11...
...Moving unit base, 12...Guide frame, 13...Fixing nut, 14...Spring, 15...Press adjustment screw, 16...Fixed receiving plate, 17...Contact plate holder, 18
. . . Contact plate, 19 . . . Extrusion metal fitting, 20 .

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A movable part base having a contact plate made of a conductive material at its end and a fixed plate made of an insulating material are provided on a base made of an insulating material facing each other, After the brush head of the brush is brought into contact with the fixed plate, the movable part base is moved to bring the contact plate into pressure contact with the bottom of the brush, thereby fixing the carbon brush on the base, and between the contact plate and the brush terminal. (b) a carbon brush fixing energizing mechanism that enables a constant current to be applied; (b) a dowel contact needle for contacting the dowel part of the fixed carbon brush; and a plurality of carbon parts for making contact with the carbon part. A measuring plate, each equipped with a contact needle, was installed on the base so that it could be pressed against a fixed carbon brush, and the voltage drop between the contact needle and each carbon part contact needle could be measured. A carbon brush specific resistance measuring device comprising the drop measuring mechanism (a) and (b).