JPH0515005A - Brush wear detector for current collector of insulated trolley - Google Patents

Abstract

PURPOSE:To effectively detect a wear by providing a supporting fitting of a pressure-sensitive conductive sensor at a predetermined position of a bottom of a trolley formed of a conductor in a U-shaped sectional insulation cover, and pressing it by a brush of a current collector. CONSTITUTION:A conductor 1 is contained inside a U-shaped sectional insulation cover 2 to constitute an insulated trolley 3. A supporting fitting 4 is provided at an opposite side of the cover 2 to its opening side. The fitting 4 is formed of substantially U-shaped rectangular member having a stripelike pressure- sensitive conductive sensor 6 in an inner bottom, and mounted across the split part of the cover 2. The fitting 4 contains a friction sensing block 9 as a core in such a manner that a protrusion 10 of the block 9 presses the sensor 9 in response to a force of a spring 12 and a force of a brush holder 7. A sliding length of the block 9 is set shorter than a distance between the surface of the holder 7 and the front side stripe surface of the sensor 6 by a wear limit length adjusting screw 13. Thus, the wear of a brush 8 is accurately detected to improve its durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush wear detecting device for a current collector of an insulating trolley.

[0002]

2. Description of the Related Art Some of the inventors of the present invention have previously proposed a current collector brush wear detecting device for an insulating trolley. (Japanese Patent Application No. 01-203553) Such a device includes a receiver mounted on the insulating trolley from the side opposite to the brush insertion side, and a strip-shaped pressure-sensitive conductive sensor disposed on the inner bottom surface of the receiver. A brush wear limit length shorter than the distance between the brush holder of the current collector and the pressure-sensitive conductive sensor, which is slidably disposed in the receiving member along the insertion direction of the current collector of the insulating trolley. Equipped with a wear detection block, and the point surface of the pressure-sensitive conductive sensor is pushed in by providing a point projection on the outer bottom surface of the wear detection block on the side opposite to the contact part with the brush holder. To achieve the action regarding the wear limit of the brush.

[0003]

As described above, if the pressure-sensitive conductive sensor is pushed by the point projections,
The pressure-sensitive conductive sensor may operate even with slight vibrations such as sliding against the insulating trolley of the brush, and if one point of the pressure-sensitive conductive sensor is pressed for a long time, the sensor will deform (dent). There was a risk that the abrasion degree of the brush could not be accurately detected. In addition, if there is a slight deviation in the dimensions of the wear detection block or the connection with the current collector or pressure-sensitive conductive sensor, and the clearance between the parts is too large, even if the brush actually reaches the wear limit, Could not be detected, but there was no way to correct it.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a reliable operation and excellent durability.

[0005]

The solution provided by the present invention is a receiver mounted on an insulating trolley from the side opposite to the brush insertion side, and a strip-shaped member disposed on the inner bottom surface of the receiver. The pressure-sensitive conductive sensor is slidably arranged in the receiving member along the insertion direction of the current collector of the insulating trolley, and the brush of the brush is more than the distance between the current-collecting brush holder and the pressure-sensitive conductive sensor. A wear detection block shortened by about the wear limit length is provided, and a surface contact is made on the outer bottom surface of the wear detection block on the side opposite to the contact portion with the brush holder in a state intersecting the band surface of the pressure-sensitive conductive sensor. This is because a possible jetty is formed so that the pressure-sensitive conductive sensor can be pushed in and out on the inner bottom surface of the receiving tool and an adjusting screw for pushing the pressure-sensitive conductive sensor from the back side is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing an embodiment of a brush wear detecting device for a current collector for an insulating trolley according to the present invention, FIG. 2 is a sectional view taken along line A--A of FIG. 1, and FIG. Similarly FIG.
FIG.

The insulating trolley 3 comprises a conductor 1 covered with an insulating cover 2 having a substantially U-shaped cross section, and a pair of legs of the insulating cover 2 are provided on both sides of a sliding surface set on one side surface of the conductor 1. The shaped portion is extended to form a limited opening, and the brush 8 of the current collector 5 is inserted from there.

The insulating trolley 3 is provided with a receiving member 4 of the wear detecting device at an arbitrary position. The receiving member 4 is composed of a substantially U-shaped strip and is attached so as to straddle the cut and separated portion of the insulating cover 2 of the insulating trolley, and is on the side opposite to the sliding surface with respect to the exposed conductor. The inner bottom surface and the inner side surfaces on both side surfaces are spaced apart and face each other.

The pressure-sensitive conductive sensor indicated by reference numeral 6 is arranged on the inner bottom surface of the receiving member 4 in a band shape. As such a sensor, for example, a pressure-sensitive conductive rubber pressure-sensitive sensor sold by Bridgestone Co., Ltd. under the trade name of “CORD SWITCH” is suitable. The main body of the sensor is a combination of silicon rubber and metal fine particles, and when pressure is applied, it changes from an insulating state (several tens of MΩ or more) to a conducting state (several Ω).
It consists of a pressure conductive rubber that shows a rapid change in resistance to the following), sandwiches the flat plate of the flat braided wire that serves as electrodes from both sides, and covers the whole with a sheath of silicon rubber to code. is there. The sensor is several hundred
It is designed to operate (conduct) with a load (pressure) of mg.

The wear detecting block 9 of the wear detecting device is arranged as a core with respect to the receiving tool 4 and has a substantially U-shaped basic shape. It is provided so that it can slide along. The wear detecting block 9 has a sliding length that is shorter than the distance between the shoulder surface of the brush holder 7 and the front side belt surface of the pressure-sensitive conductive sensor 6 by about the wear limit length of the brush. The contact portion 11 with the brush holder 7, which is formed by, is formed in an arc shape with a large R so that the brush holder 7 can smoothly slide when the current collector 5 travels on the current collecting side. A contact portion of the outer bottom surface with the pressure-sensitive conductive sensor 6 forms a jetty 10 capable of surface contact in a state of intersecting the band surface of the pressure-sensitive conductive sensor.

In the portions forming the walls on both sides of the receiving tool 4,
A notch-shaped recess 4a is formed, into which the arm portions 9a protruding from the lower portions on both sides of the wear detection block 9 enter,
A coiled spring 12 is linked between the bottom surface of the recess 4a and the arm portion 9a. The spring 12 prevents the buckling by penetrating the arm portion 9a and guiding it. In the wear detecting block 9, the spring 12 is weighted and supported, so that the jetty 10 is made to support the pressure-sensitive conductive sensor 6.
I'm trying not to impose my delusion on me.

The bottom wall of the receiving member 4 is provided with a concave portion 4b for dropping and positioning the strip-shaped pressure-sensitive conductive sensor 6 on the inner surface side, and an adjusting screw 13 extending from the outer surface side to the concave portion 4b. Is screwed in. The adjusting screw 13 is adapted to be able to project and retract in the concave portion 4b in a state of facing the jetty 10 of the wear detecting block 9, and therefore, the position of the front surface is adjusted by pressing the rear surface of the pressure sensitive conductive sensor 6. However, it is possible to correct the clearance with the jetty 10 and accurately match the operation start timing of the sensor with the wear limit of the brush.

In the device constructed as described above, when the current collector 5 is spring-biased to the insulating trolley 3, the brush 8 of the current collector is pressed against the sliding surface of the conductor 1 through the opening of the insulating cover 2, If the support base that supports the current collector 5 is connected to the mobile device, the required power travel is performed together with the travel of the mobile device. When the brush 8 wears with sliding in the process of repeating the current collecting run and the wear reaches the limit, the brush holder 7 presses the one end side portion 11 of the wear detecting block 9, and the wear detecting block 9 is pressed down while compressing the spring 12, the surface of the jetty 10 on the outer bottom surface presses the front side band surface of the pressure-sensitive conductive sensor 6, and the pressure-sensitive conductive sensor 6 thus actuated (conduction). To do. If a suitable detection circuit is installed in the lead wire of the sensor, it is possible to detect the movement of the sensor and detect the wear limit of the brush.

[0014]

According to the brush current detector of the current collector for the insulating trolley of the present invention constructed as described above, the strip surface of the strip-shaped pressure-sensitive conductive sensor is formed on the jetty surface of the wear detection block. Since it is pressed, it is possible to reduce the fatigue of the pressure-sensitive conductive sensor without stress concentration on the extreme parts of the sensor. Also, since the surface pressure can be widened, the pressure-sensitive conductivity can be generated by the slight vibration caused by the sliding of the brush. The sensor will not operate. Further, since the pressure-sensitive conductive sensor can be pushed by the adjusting screw from the back surface opposite to the surface pressed by the jetty, the start of operation of the pressure-sensitive conductive sensor by the jetty can be arbitrarily adjusted. Therefore, the intended purpose of providing reliable operation and excellent durability can be sufficiently achieved.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Conductor 2 Insulation Cover 3 Insulation Trolley 4 Receiver 5 Electron Collection 6 Pressure Sensitive Conductivity Sensor 7 Brush Holder 8 Brush 9 Wear Detection Block 10 Jetty 13 Adjustment Screw

Front page continuation (72) Inventor Toru Nagase 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Cable Ltd. Hidaka factory

Claims (1)

Claim: What is claimed is: 1. A receiver mounted on an insulating trolley from the side opposite to the brush insertion side, a strip-shaped pressure-sensitive conductive sensor disposed on the inner bottom surface of the receiver, and The insulating trolley is slidably arranged in the receiving member along the insertion direction of the current collector, and is made shorter than the distance between the current collector brush holder and the pressure-sensitive conductive sensor by about the wear limit length of the brush. A wear detecting block is provided, and a jetty capable of surface contact is formed on the outer bottom surface on the side opposite to the contact portion with the brush holder of the wear detecting block in a state of intersecting the strip surface of the pressure-sensitive conductive sensor, A brush wear detecting device for a current collector for an insulating trolley, which is provided with an adjusting screw capable of projecting and retracting on the inner bottom surface of the receiving tool and pushing the pressure-sensitive conductive sensor from the back side.