JP2012011943A - Hot-line alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED To realize a smooth operation by detecting only a necessary railway overhead line in conformity with a use form at a railway track maintenance site.
SOLUTION: A live line alarm device that detects that a railway overhead line is in a contactless state, and detects a strip-like strip that forms a capacitance with the railway overhead line when approaching the railway overhead line. The electrode 3 is provided, and the detection electrode 3 has directivity only in the approaching direction to the railway overhead line, and is built in the casing 2 having the bending portion 1 at a portion facing the approaching direction to the railway overhead line. Arranged in an arc shape along the inner wall surface of the bent portion 1 of the body 2.
[Selection] Figure 1

Description

  The present invention is used at a railway track maintenance site, and when approaching a charged railway overhead line, the railway overhead line is detected in a non-contact manner and a warning is given to an operator to prevent an electric shock accident or the like. It relates to a live line alarm device to prevent.

  In railway track maintenance sites, there are many cases of death or serious injury due to electric shock accidents due to contact with charged railway overhead lines due to operator error or carelessness. As means for preventing such an electric shock accident, there has been proposed a live line alarm attached to a helmet worn by an operator on his / her head in order to ensure work safety (see, for example, Patent Document 1).

  When this type of live line alarm is used, for example, when an operator approaches an electrically charged railway overhead line using, for example, an insulating ladder, the railway overhead line is detected in a non-contact manner, and at the same time, The operator is warned that a charged railway overhead line is approaching by sounding a buzzer or the like based on the detection signal.

Japanese Utility Model Laid-Open No. 5-14932

  By the way, the live line alarm device disclosed in Patent Document 1 described above can cope with a case where a railway overhead line in a charged state approaches from all directions. However, at the railway track maintenance site, for example, when an operator approaches the railway overhead line in a charged state using an insulating ladder, the direction in which the worker approaches the railway overhead line in a charged state is limited.

  In other words, the current situation is that an operator usually approaches the railway overhead line in a charged state from below. Therefore, in a conventional live line alarm device capable of detection in all directions, there is a possibility that smooth operation may be hindered by detecting even railway overhead lines that do not require detection. For this reason, there is a demand for a live line alarm device adapted to the usage pattern at the track maintenance site.

  Therefore, the present invention has been proposed in view of the current situation at the railway track maintenance site, and its purpose is to detect only the necessary railway overhead lines that are compatible with the mode of use at the railway track maintenance site. The object of the present invention is to provide a live line alarm device capable of realizing a smooth operation.

  As a technical means for achieving the above-mentioned object, the present invention provides a live line alarm device for detecting that a railway overhead line is in a charged state without contact, and when the railway overhead line approaches the railway overhead line, A detection electrode for forming an electrostatic capacitance is provided between the detection electrodes, and the detection electrode has directivity only in the approaching direction to the railway overhead line. The detection electrode in the present invention preferably has a thin strip shape. In addition, the detection electrode in the present invention is built in a housing having a bent portion at a portion facing in the approaching direction to the railway overhead wire, and is arranged in an arc along the inner wall surface of the bent portion of the housing. It is desirable that

  In the present invention, when a live line alarm is used at a track maintenance site, for example, by providing a thin strip-like detection electrode having directivity only in the direction of approach to the railway overhead line, the worker is charged When approaching a railway overhead line, only the railway overhead line can be detected by the detection electrode and recognized accurately. In addition, the detection electrode of the present invention is built in a housing having a bent portion at a portion facing in the direction of approaching the railway overhead wire, and arranged in an arc along the inner wall surface of the bent portion of the housing. With the structure, it becomes easy to provide the directivity only in the approaching direction to the railway overhead line to the detection electrode in the housing.

  According to the present invention, by including the detection electrode having directivity only in the direction of approach to the railway overhead line, when using the live line alarm at the railway maintenance site, the railway overhead line in which the operator is charged When approaching, only the railway overhead line can be detected by the detection electrode and can be recognized accurately. As a result, it is possible to easily provide a live line alarm that is suitable for the type of use at the railway track maintenance site, and by detecting only the necessary railway overhead lines, it is possible to realize smooth work, thereby improving workability. .

In embodiment of this invention, it is the perspective view which looked at the hot-line alarm from the front side. In embodiment of this invention, it is the perspective view which looked at the hot-line alarm from the back side. (A) is a front view showing the live line alarm device of FIG. 1, (B) is a plan view of (A), and (C) is a right side view of (A). It is a perspective view which shows the state which removed the cover body of the hot wire alarm device of FIG. It is a perspective view which shows the state which removed the wiring board of FIG. 4 and turned it over. It is a block diagram which shows the circuit structure of the hot wire alarm device of this invention. (A) is a front view which shows the state which mounted | wore the helmet with the hot wire alarm device of this invention, (B) is a side view of (A). It is a block diagram for demonstrating the operation example of the hot wire alarm device of this invention.

  Embodiments of the hot line alarm device according to the present invention will be described in detail below. In the following embodiment, when a worker approaches a charged railway overhead line using, for example, an insulated ladder at a railway track maintenance site, it is detected without contact that the railway overhead line is charged. At the same time, a case where a warning is given to an operator that a railway overhead line in a charged state is approaching by sounding a buzzer based on the detection signal is illustrated.

  FIG. 1, FIG. 2, and FIG. 3 (A)-(C) show the external appearance of the live line alarm device in this embodiment. The live line alarm is provided with a resin casing 2 having an arc-shaped bent portion 1 on the upper part, and the casing 2 has a floating capacitance between the railway overhead line and the railway overhead line when approaching the railway overhead line. The detection electrode 3 to be formed is built in (see the broken line in the figure).

  The housing 2 has a case body 7 in which a buzzer hole 4, a push button type test switch 5 and a sensitivity adjustment volume 6 are arranged on the front surface, and is attached to the back surface of the case body 7 by screwing so that the rear opening portion thereof It is comprised with the cover body 8 which obstruct | occludes. A battery lid 9 is provided on the upper portion of the lid body 8, and a bent clip 10 is fixed to the lower portion of the lid body 8 by screwing for hooking and locking the live line alarm device to the helmet.

  4 shows a state where the lid 8 of the housing 2 is removed, and FIG. 5 shows a state where the wiring board 11 accommodated in the case body 7 of the housing 2 is removed and turned over. As shown in the figure, the aforementioned detection electrode 3 is a thin strip-shaped copper plate having directivity only in the direction of approach to the railway overhead line, and has a large size for providing directivity only in the direction of approach to the railway overhead line. And is arranged in an arc shape along the inner wall surface of the bent portion 1 of the case body 7 of the housing 2. Various electronic components are mounted on the wiring board 11 to which the detection electrodes 3 are electrically connected (see FIG. 5).

  FIG. 6 shows a circuit configuration of a hot-wire alarm device composed of various electronic components mounted on the wiring board 11 described above. As shown in the figure, the live line alarm device includes a level detection circuit 12 to which the detection electrode 3 is connected, and an intermittent signal that outputs an intermittent signal based on the detection signal output from the level detection circuit 12. A generation circuit 13 and an acoustic frequency oscillation circuit 14 that oscillates based on the intermittent signal output from the intermittent signal generation circuit 13 are configured. A buzzer 15 is electrically connected to the acoustic frequency oscillation circuit 14.

  This buzzer 15 is arranged in the buzzer hole 4 of the case body 7 of the housing 2 (see FIG. 1 and FIG. 3A). A battery 16 for driving the level detection circuit 12, the intermittent sound generation circuit 13, and the acoustic frequency oscillation circuit 14 is electrically connected to each circuit. The battery 16 is mounted on the back side of the wiring board 11 and can be replaced by opening and closing the battery lid 9 of the lid 8 of the housing 2 (see FIG. 2). A push button type test switch 5 is provided in addition to the buzzer 15 and the battery 16 (see FIGS. 1 and 3A).

In the level detection circuit 12 described above, when a railway overhead line in a charged state approaches the detection electrode 3, the floating capacitance C ₀₁ formed between the detection electrode 3 and the railway overhead line 18 and the human body. An appropriate detection level is set so that a minute electrostatic induction current I ₀ flowing from the detection electrode 3 to the human body becomes an operating current by the formed capacitance C ₀₂ (see FIG. 8). The detection level can be adjusted by the sensitivity adjustment volume 6 provided on the front surface of the housing 2 (see FIGS. 1 and 3A).

  The usage example of the hot-wire alarm device which consists of the above structure is explained in full detail below. In addition, as described above, this live line alarm device is used when a worker performs a track maintenance work on a railway overhead line located above the worker using, for example, an insulating ladder at a rail track maintenance site. The

  Prior to performing this track maintenance work, as shown in FIGS. 7A and 7B, a live line alarm is attached to the helmet 17 worn by the operator on the head. This live line alarm can be easily attached by hooking and locking the clip 10 so that the lower edge of the side of the helmet 17 is sandwiched between the bent clip 10 provided in the housing 2. .

When the railway overhead line 18 in the charged state approaches from above the helmet 17 of the worker during the track maintenance work, the floating formed between the railway overhead line 18 in the charged state and the detection electrode 3 as shown in FIG. The level detection circuit 12 detects a minute electrostatic induction current I ₀ flowing from the detection electrode 3 to the human body by the electrostatic capacitance C ₀₁ and the electrostatic capacitance C ₀₂ formed between the human body. The intermittent signal generating circuit 13 outputs an intermittent signal based on the detection signal output from the level detection circuit 12, and the buzzer 15 is driven using the oscillation signal output from the acoustic frequency oscillator circuit 14 based on the intermittent signal as a drive signal. Let them pronounce. The buzzer 15 generates a warning to alert the worker that the charged railway overhead line 18 is approaching.

  In this live line alarm device, since the detection electrode 3 is arranged along the arcuate inner wall surface of the bent portion 1 located at the upper part of the housing 2, directivity only in the direction of approach to the railway overhead line 18 is provided. It is trying to have. As a result, when using the live line alarm device at the railway track maintenance site, the worker approaches the railway overhead line 18 in a charged state using the insulating ladder with the housing 2 attached to the side of the helmet 17. In this case, the worker approaching the railway overhead line 18 in the charged state from the lower side accurately detects by the detection electrode 3 that the railway overhead line 18 located only above the helmet 17 is in the charged state. I can recognize it.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

DESCRIPTION OF SYMBOLS 1 Curved part 2 Case 3 Detection electrode 18 Railway overhead wire

Claims (3)

  A live line alarm device that detects that a railway overhead line is in a charged state without contact, and includes a detection electrode that forms a capacitance with the railway overhead line when approaching the railway overhead line, the detection electrode Is a live line alarm that has directivity only in the direction of approach to the railway overhead line.   The live line alarm device according to claim 1, wherein the detection electrode has a thin strip shape.   The detection electrode is built in a housing having a bent portion at a portion facing in a direction approaching a railway overhead line, and is arranged in an arc shape along an inner wall surface of the bent portion of the housing. The live line alarm device according to 1 or 2.

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