JP2011188662A - Measuring instrument for generator brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure the amount of wear of a brush, in a stable and easy way. <P>SOLUTION: At the tip 21 of a measuring bar 2, an engaging part 21 is formed which is engaged with a limit groove 100a provided in the brush 100 of a generator, and scale 22 is marked in the longitudinal direction of the measuring bar 2. Moreover, a measuring element 3 is slidably arranged and installed in the longitudinal direction of the measuring bar 2. The engaging part 21 of the measuring bar 2 is engaged with the limit groove 100a of the brush 100, and a measuring surface 3a of the measuring element 3 abuts against a wear surface 100b of the brush 100 by sliding the measuring element. In this state, the length from the engaging part 21 of the measuring bar 2 to the measuring surface 3a of the measuring element 3 is read by the scale 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a generator brush measuring instrument for measuring and confirming the amount of wear of a brush (brush) of a generator.

  The generator is provided with a brush for energizing the rotor, and this brush is made of a soft material such as graphite so as not to wear the slip ring of the rotor. And since it is contacting so that it may be pressed against a slip ring, a brush will wear with progress of time (for example, refer patent document 1). When such wear progresses, for example, when a plurality of brushes are arranged, the current that flows differs depending on the contact area, so that the current concentrates on the brush with a small contact area, which may cause problems such as abnormal heat generation. is there. For this reason, the wear limit is set by the brush supplier. If the wear limit is reached, it is necessary to replace the brush, and the user operating the generator periodically checks the amount of wear on the brush. Must.

Japanese Patent Laid-Open No. 09-140099

  By the way, in order to confirm the amount of wear of the brush, it has been performed as follows. That is, the length from the limit groove marked as the limit value on the brush to the wear surface (contact surface with the slip ring) of the brush is measured with a ruler. At this time, with one operator holding the brush and another operator holding the tip of the ruler against the limit groove of the brush, the scale of the ruler on which the brush wear surface is located is read and the read value is stored. . In this way, since it is necessary to read the scale of the ruler with the tip of the ruler in contact with the limit groove of the brush, it takes time and labor, and in particular, the generator generates many brushes with multiple axes. If so, it takes a great deal of time and effort. In addition, if the tip of the ruler is displaced, the amount of wear cannot be measured accurately, which may cause measurement errors by the operator.

  Accordingly, an object of the present invention is to provide a generator brush measuring instrument capable of measuring the amount of wear of a brush stably and easily.

  In order to achieve the above-mentioned object, the invention described in claim 1 is a bar-like measuring bar provided with an engaging portion at a tip thereof that engages a limit groove indicating a wear limit line provided on a brush of a generator. A measuring element that is slidably arranged in the longitudinal direction of the measuring bar and has a measuring surface that can come into contact with the wear surface of the brush, and a distance from the engaging portion of the measuring bar to the measuring surface of the measuring element A measuring instrument for measuring the generator brush.

  According to the present invention, the engaging portion of the measuring bar is engaged with the limit groove of the brush, the measuring member is slid, and the measuring surface is brought into contact with the worn surface of the brush. In this state, the distance from the wear limit line of the brush to the wear surface is measured by measuring the distance from the engaging portion of the measurement bar to the measurement surface of the measure by the measuring means.

  According to a second aspect of the present invention, in the generator brush measuring instrument according to the first aspect, an area having a predetermined length from the tip of the measurement bar is used as a management area, and an identification mark for identifying the management area is provided as the identification mark. Provided on the measuring bar, the length of the management area is set so that the brush needs to be replaced when the length from the wear limit line of the brush to the wear surface is less than the length of the management area It is characterized by that.

  According to the present invention, if the wear surface of the brush is out of the management area with the engagement portion of the measuring bar engaged with the limit groove of the brush, the brush wear surface does not need to be replaced. If it is within the management area, it is determined that the brush needs to be replaced.

  According to the first aspect of the present invention, the engaging portion of the measuring bar is engaged with the limit groove of the brush, the measuring surface of the measuring member is brought into contact with the worn surface of the brush, and the measuring means measures from the engaging portion. By measuring only the distance to the surface, the length from the wear limit line of the brush to the wear surface, that is, the amount of wear of the brush can be measured. At this time, in order to engage the engaging portion of the measuring bar with the limit groove of the brush, the tip of the measuring bar is stably and surely positioned on the wear limit line, and the measuring surface is slid to bring the measuring surface into contact with the brush. By contacting the wear surface, the position of the wear surface can be grasped stably and reliably. In addition, after the measuring surface of the measuring element is brought into contact with the worn surface of the brush, the measuring instrument for the generator brush is removed (separated) from the brush, and the distance from the engaging portion to the measuring surface is measured by the measuring means. Can be measured. In this way, it becomes possible to measure the wear amount of the brush stably and easily.

  According to the second aspect of the present invention, it is possible to determine whether or not the brush needs to be replaced simply by engaging the engaging portion of the measuring bar with the limit groove of the brush. For this reason, even if there are many brushes, it is possible to quickly and accurately determine whether or not replacement is necessary.

It is the top view (a) and front view (b) which show the measuring device for generator brushes concerning embodiment of this invention. It is a perspective view which shows the state which is measuring the abrasion amount of a brush with the measuring device for generator brushes of FIG.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a diagram showing a generator brush measuring instrument 1 according to an embodiment of the present invention. The generator brush measuring instrument 1 is a measuring instrument for measuring and confirming the amount of wear of the generator brush, and mainly comprises a measuring bar 2, a measuring element 3, and a scale (measuring means) 22. ing.

  The measuring bar 2 has a flat bar shape (ruler shape) and is formed with an engagement portion 21 bent at a right angle at one end (tip). As shown in FIG. 2, the engaging portion 21 is formed so as to engage with a limit groove 100 a indicating a wear limit line provided in the brush 100. Here, the brush 100 comes into contact with the slip ring of the rotor at the wear surface 100b, and wears by the contact. The generator manufacturer and the like have determined that the wear limit line (limit groove 100a) may be worn.

  The measuring element 3 has a measuring surface 3 a that is slidably disposed in the longitudinal direction of the measuring bar 2 and that can contact the wear surface 100 b of the brush 100. That is, the measuring element 3 is a cylindrical body having a rectangular cross section, and the measuring bar 2 is inserted into the cylindrical body so that it can slide in the longitudinal direction of the measuring bar 2. Further, as will be described later, by sliding the measuring element 3 toward the brush 100, the measuring surface 3 a which is the surface on the brush 100 side comes into contact with the wear surface 100 b of the brush 100. Here, the fitting relationship (tightness) between the measuring bar 2 and the measuring element 3 is such that the measuring element 3 can be easily slid by hand and the measuring element 3 is not slid and moved in the state where no external force is applied. Is set.

  The scale 22 is formed and marked on the upper surface (plane) of the measuring bar 2 along the longitudinal direction thereof, and by reading the scale 22, from the engaging portion 21 of the measuring bar 2 to the measuring surface 3a of the measuring element 3 The distance can be measured.

  An area having a predetermined length from the tip (engagement portion 21) of the measurement bar 2 serves as a management area 23, and this management area 23 is painted in a color (identification mark) different from that of the other areas. 23 can be easily and reliably identified. Here, the length L of the management area 23 is such that the brush 100 needs to be replaced when the length from the wear limit line (limit groove 100a) of the brush 2 to the wear surface 100b is equal to or less than the length L of the management area. Is set. That is, as described above, the brush 100 should not be worn beyond the limit groove 100a, and the brush 100 must be replaced before that. On the other hand, if the replacement is performed too early, the brush 100 cannot be used effectively, resulting in an increase in cost. For this reason, the length L of the management area 23 is set as a management value that allows the brush 100 to be used as effectively as possible and that can be surely replaced before being worn beyond the limit groove 100a.

  Next, a method of measuring the wear amount of the brush 100 by the generator brush measuring instrument 1 having such a configuration will be described.

  First, the brush 100 is taken out from the generator, and as shown in FIG. 2, the brush 100 is placed on a table or the like with the limit groove 100a as an upper surface. A holder is attached to the non-limit groove 100a side of the brush 100. In this state, the engaging portion 21 of the measuring bar 2 is engaged with the limit groove 100a of the brush 100, the measuring member 3 is slid toward the brush 100, and the measuring surface 3a is brought into contact with the worn surface 100b of the brush 100. Let Here, if the wear surface 100b of the brush 100 is outside the management region 23 in a state where the engaging portion 21 is engaged with the limit groove 100a, the brush 100 is not required to be replaced and the wear surface 100b of the brush 100 is not necessary. If it is within the management area 23, it is determined that the brush 100 needs to be replaced.

  Next, the position of the measurement surface 3 a of the probe 3 is read with the scale 22. At this time, the measuring instrument 3 for the generator brush 1 may be separated from the brush 100 while the measuring element 3 is left in the same position, and the scale 22 may be read in a bright place with good environment. By this reading, the length from the limit groove 100a of the brush 100 to the wear surface 100b is measured, and the amount of wear of the brush 100 is measured.

  As described above, according to the generator brush measuring instrument 1, the engaging portion 21 of the measuring bar 2 is engaged with the limit groove 100a of the brush 100, so that the tip of the measuring bar 2 is stably and reliably worn. Located in line. In addition, by sliding the measuring element 3 and bringing the measuring surface 3a into contact with the wear surface 100b of the brush 100, the position of the wear surface 100b can be grasped stably and reliably. Furthermore, after the measuring surface 3a of the measuring element 3 is brought into contact with the worn surface 100b of the brush 100, the measuring instrument 3 for the generator brush is removed from the brush 100, and the measuring surface 3a is measured in a bright and good place. The position can be read on the scale 22. In this way, the wear amount of the brush 100 can be measured stably and easily.

  Further, it is possible to determine whether or not the brush 100 needs to be replaced simply by engaging the engaging portion 21 of the measuring bar 2 with the limit groove 100a of the brush 100. For this reason, even when the generator has many brushes 100 such as multiple axes, it is possible to quickly and accurately determine whether or not the brush 100 needs to be replaced.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above-described embodiment, the scale 22 is used as the measuring unit, but a measuring device similar to a capacitance type or incremental type digital caliper may be used as the measuring unit. At this time, a memory for storing measured values may be provided. Further, although the management area 23 is identified by being painted with an identification color, the boundary between the management area 23 and another area may be separated by a line. Further, the measuring bar 3 is slidable in a state where the measuring bar 2 is inserted into the measuring bar 3. For example, a concave guide extending in the longitudinal direction is provided on the measuring bar 2, and a convex fitting to be fitted to the guide is provided. The measuring element 3 may be slidable by providing a shaped guided portion on the measuring element 3.

DESCRIPTION OF SYMBOLS 1 Measuring instrument for generator brushes 2 Measuring bar 21 Engagement part 22 Scale (measuring means)
23 Control area 3 Measuring element 3a Measuring surface 100 Brush 100a Limit groove 100b Wear surface

Claims (2)

A measuring bar provided at the tip with a bar-like engagement portion that engages a limit groove indicating a wear limit line provided on the brush of the generator;
A measuring element that is slidably disposed in the longitudinal direction of the measuring bar and has a measuring surface that can come into contact with the worn surface of the brush;
Measuring means for measuring the distance from the engaging portion of the measuring bar to the measuring surface of the measuring element;
A measuring instrument for a generator brush. An area of a predetermined length from the tip of the measurement bar is set as a management area, and an identification mark for identifying the management area is provided on the measurement bar,
The length of the management area is set to require replacement of the brush when the length from the wear limit line of the brush to the wear surface is equal to or shorter than the length of the management area. The generator brush measuring instrument according to claim 1.

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