JPH0687133U - Loop coil for moving object detection - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a loop coil for detecting a moving body that does not require a special construction method and is not affected by moisture, heat, shock, and the like. [Structure] A large number of unstranded insulated core wires are provided with a collective protective layer on the outside to form an electric wire of the required size, and the first insulated wire core is formed at the beginning and end of the wire. Is connected to the beginning of the second insulated core, the end of the second insulated core is connected to the beginning of the third insulated core, and so on. The cores are connected to form a coil by connecting each core in series, and the start end of the first insulated core and the end of the final insulated core are connected to the signal source lead wire.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loop coil which serves as a sensor for detecting the presence of a moving body such as an automobile or a railway vehicle traveling on the surface of the earth, when the moving body approaches, reaches, or passes by.

[0002]

[Prior art]

 The loop coil method is widely adopted as a sensor for detecting the presence of a moving body such as an automobile or a railway vehicle when it approaches, reaches or passes through a certain point, and uses it as a source of information such as the operation of a circuit breaker. This method takes advantage of the fact that an electric field is generated by passing an electric current through an electric wire that has been laid and wound several turns in the ground that is not too deep, and the electric field fluctuates depending on whether or not a moving object exists in the electric field range. It is something to detect.

Conventionally, as a loop coil of this type, the ground surface of a site requiring this is excavated, a single electric wire is wound around the ground coil for a required number of turns, and then the ground surface is restored to its original state. It was formed and installed by this construction method.

[0004]

[Problems to be solved by the device]

 By the way, the loop coil formed and installed by this method was strongly affected by external moisture such as moisture in the ground, heat and impact during re-paving, and stable detection characteristics were often not obtained. The present invention has been made in view of such a point, and an object thereof is to provide a loop coil which is not affected by moisture, heat, shock, etc. without requiring a special construction method.

[0005]

[Means for Solving the Problems]

 In this invention, an electric wire having a collective protective layer provided on the outside of a large number of unstranded insulated core wires is formed into an annular shape of a required size, and the first wire is formed at the beginning and end of the electric wire. The end of the core is connected to the beginning of the second insulated core, the end of the second insulated core is connected to the beginning of the third insulated core, and so on. To form a coil by connecting each insulated wire core so that each insulated wire core is connected in series, and the start end of the first insulated wire core and the end of the last insulated wire core are connected to the signal source lead wire. It is a loop coil for moving body detection configured by being connected.

[0006]

[Action]

 Since the looped coil is formed by the untwisted insulated core wire in the collective protection layer, it is possible to use a loop coil that is not affected by moisture, heat, shock, etc. without requiring a special construction method. Become.

[0007]

【Example】

 Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an electrical system diagram in which the loop coil of the present invention is electrically connected. That is, a large number of non-twisted insulated wire cores 1, 2, 3, ... Are formed into an annular shape having a length necessary for a loop coil of an electric wire A covered with a collective protective layer 21, and its starting end a , B, c ... and terminations a ', b', c '..., the end a'of the first insulated wire core 1 is connected to the start end b of the second insulated wire core 2 and its end. b'is connected to the starting end c of the third insulated wire core 3, and so on, and so on. As a result, the non-twisted insulated wire cores 1, 2, 3, ... Are connected in series to form an annular coil.

FIG. 1 shows an example of a loop coil composed of three insulated wire cores 1, 2, and 3 for simplification. The starting end a of the first insulated wire core 1 and the terminal end c ′ of the last insulated wire core 3 are connected to the cable conductors 11 and 12 of the lead wire B connected to the signal source, and completed as a loop coil.

As shown in the cross-sectional view of FIG. 2, the electric wire for forming the loop coil has insulated wire cores 1, 2, 3, ... Are arranged without being twisted together and are collectively protected on the outside by vinyl, etc., and are not easily affected by water, heat, impact, etc. from the outside, and have the flexibility required to form an annular shape. The one provided with 21 is used.

The number of insulated wire cores 1, 2, 3, ... May be any number as long as the required number of turns of the loop coil is secured. Here, the connection point between the beginning and the end of the electric wire A forming the loop coil and the connection point with the lead wire B going to the signal source are housed in a connection box C, and the connection box C is filled with epoxy resin or the like. By taking it, the loop coil is formed so as to protect the connection point from moisture, heat and impact when it is buried underground.

FIG. 3 shows a state in which the loop coil LC of the present invention is laid in the ground, a track T is passing on the ground, and the track T is being detected. Even in an adverse environment where vibrations from the truck T, heat from rainwater and solar radiation, etc. are applied to the loop coil LC, it is possible to obtain a loop coil that can reliably detect a moving object without being affected by them.

[0012]

[Effect of device]

 As explained above, since the loop coil of this invention is formed by a single wire with a collective protective layer, it is possible to maintain stable performance that is not affected by moisture, heat, shock, etc. in the ground. Become. Also, unlike a single thick wire with an external protective layer that has been wound a few turns, the wire that forms the loop coil is made thin, and the number of turns required can be reduced to a compact number. Since the outer side of the grip is constructed with a single protective layer, it is easy to lay, and there is very little disruption to traffic during laying work.

[Brief description of drawings]

FIG. 1 is an electric system diagram in which a loop coil according to an embodiment of the present invention is electrically connected,

2 is a cross-sectional view showing the configuration of the loop coil of FIG.

FIG. 3 is an explanatory diagram showing a state in which a loop coil is actually laid in the ground to detect a moving body.

[Explanation of symbols]

 1,2,3 Insulated wire core A Electric wire covered with collective protection layer B Lead wire C Junction box 11,12 Cable conductor of lead wire 21 Collective protection layer 22 Cable conductor 23 Cable insulator

Claims (1)

[Scope of utility model registration request] 1. An electric wire formed by providing a collective protective layer on the outside of a large number of non-twisted insulated core wires is formed into a ring shape having a required size, and the first insulation is provided at the beginning and the end of the electric wire. The end of the core is connected to the beginning of the second insulated core, the end of the second insulated core is connected to the beginning of the third insulated core, and so on. To form a coil by connecting each core so that each core becomes a series, and connect the start end of the first insulation core and the end of the last insulation core to the signal source lead wire. Loop coil for moving object detection.