JP7705153B2 - Wild boar prevention system - Google Patents

Description

This invention relates to a wild boar intrusion prevention system that prevents wild boars from invading and causing damage to agricultural crops.

As disclosed in Patent Document 1 by the applicant of the present application, there has been a harmful animal intrusion prevention system that protects a specific area or settlement that includes multiple fields and the like by surrounding it with a single electric fence. This harmful animal intrusion prevention system is a system that targets harmful animals such as wild boars and deer, and has an entrance in the middle of the electric fence for internal and external traffic roads to pass through. A gate device is installed at the entrance, and the gate device is configured to automatically open and close the entrance when pedestrians, cars, etc. pass through.

The gate device has an opening and closing member that prevents the passage of harmful animals and humans when closed, an electric shock means that gives an electric shock to harmful animals that come into contact with the opening and closing member, a drive mechanism that drives the opening and closing member to open and close, and a passer-by detection device that detects harmful animals and humans, and automatically switches the state of the opening and closing member based on the detection results of the passer-by detection device.

JP 2020-78289 A

The wild boar intrusion prevention system in Patent Document 1 targets multiple harmful animals such as wild boars and deer, so it inevitably requires a large-scale gate device, resulting in a relatively expensive configuration.

The inventor thought that if he narrowed down the target to wild boars, he might be able to make a cheaper structure by taking advantage of the boars' habits. Also, when he spoke to people in areas troubled by damage caused by harmful animals, he heard many of them say that the main problematic harmful animal was wild boars, and that if they could prevent the intrusion of wild boars, there would be sufficient benefits.

This invention was made in consideration of the above background technology, and aims to provide a boar intrusion prevention system that can effectively prevent wild boars from intruding into protected areas and can be constructed more cheaply than conventional systems.

This invention is a wild boar intrusion prevention system comprising: an electric fence that separates a wild boar living area from a protected area and prevents wild boars in the wild boar living area from invading the protected area; an access opening provided by opening partway through the electric fence to allow an inside-outside traffic road connecting the inside and outside of the protected area to pass through; and an electric shock device installed at the access opening, the electric shock device comprising an electric wire installation device that stretches a bare electric wire so that it crosses the access opening in the width direction, and a high-voltage generator that applies a high voltage to the bare electric wire, the electric wire installation device supporting and fixing both ends of the bare electric wire so that the bare electric wire is normally suspended at a height of 30 to 100 mm away from the ground, and when an external force is applied to the bare electric wire, the tension of the bare electric wire is relaxed so that the tension does not exceed a certain value, thereby preventing the bare electric wire from breaking, and when the external force is removed, the system returns to its normal state. Furthermore, it is preferable that an insulating material be provided midway along the bare electric wire to maintain a predetermined distance between the bare electric wire and the ground.

The wild boar intrusion prevention system of this invention can easily form a large-scale system that protects a specific area or village, including multiple fields, with a single electric fence, so the total cost can be significantly reduced compared to when each resident installs a small system individually. Also, an entrance for an internal and external road is provided midway through the electric fence, and a unique electric shock device that utilizes the habits of wild boars is installed at the entrance, so that wild boars can be effectively prevented from invading the protected area through the entrance, and pedestrians and cars can easily pass through the entrance without any hindrance. Also, the electric shock device has a simple configuration, so it can be installed very cheaply.

1 is a plan view showing an overall view of one embodiment of the wild boar intrusion prevention system of the present invention. FIG. 1 is a perspective view showing an electric shock device installed at an entrance of the wild boar intrusion prevention system of this embodiment. 3A is a perspective view showing a state in which a plurality of insulating tube materials are attached to the bare electric wires of the electric shock device of FIG. 2, and FIG. 3B is an enlarged cross-sectional view of the insulating tube materials.

An embodiment of the wild boar intrusion prevention system of the present invention will be described below with reference to the drawings. The wild boar intrusion prevention system 10 of this embodiment is a system installed to protect villages and the like located in mountainous areas from wild boars. For example, the village shown in FIG. 1 is located inside a wild boar habitat area IA where wild boars live, and almost the entire village, including multiple fields T, houses J, community roads SD, etc., is a protected area HA. In addition, the village is crossed by an inside/outside traffic road ND that connects the inside and outside of the protected area HA. The inside/outside traffic road ND is a road that leads to other adjacent villages, and is used by pedestrians, bicycles, and automobiles (two-wheeled and four-wheeled vehicles), etc.

The wild boar intrusion prevention system 10 is equipped with an electric fence 12 that separates the wild boar habitat area IA from the protected area HA and prevents wild boars from invading the protected area HA. To allow the inside-outside road ND to pass through, as shown in Figure 2, two openings in the electric fence 12 are provided to provide access points 14, and each access point 14 is equipped with a unique electric shock device 16.

The electric fence 12 is a typical electric fence aimed at wild boars and the like, with two bare electric wires 12a strung across multiple posts. A high voltage generator 20 generates high voltage based on the electrical energy generated by a solar power generator 20a, and applies this voltage to the two bare electric wires 18. When there are two bare electric wires 18, they are strung at heights of, for example, about 20 cm and about 40 cm. At these heights, wild boars cannot jump over or pass through, and when they come into contact with them, an electrical stimulus can be accurately applied. The number of bare electric wires 18 may be increased to three or more.

The electric shock device 16 is an electric shock device targeted at wild boars, and is composed of an electric wire installation device 24 that stretches bare electric wires 22 across the width of the passageway 14, and a high-voltage generator 26 that applies a high voltage to the bare electric wires 22. The high-voltage generator 26 can also be used as the high-voltage generator 20 for the electric fence 12 described above.

The electric wire installation device 24 normally supports and fixes both ends of each bare electric wire 22 so that the bare electric wires 22 are suspended at a position spaced apart from the ground and at a height of 30 to 200 mm, preferably at a low position of 100 mm or less. When an external force is applied to the bare electric wires 22, the bare electric wires 22 are elastically displaced or one end or both ends of the bare electric wires 22 are elastically displaced to loosen the fixation so that the tension of the bare electric wires 22 does not exceed a certain value, thereby reducing the tension of the bare electric wires 22 and preventing breakage. After that, when the external force is removed, an operation is performed to return the bare electric wires 22 to their normal state. A specific example of the structure of the electric wire installation device 24 is a structure in which one end or both ends of the bare electric wires 22 are supported via a spring member with a predetermined elasticity.

When wild boars walk, they have a tendency to always lower their noses as if searching for food, and they do the same when they are searching for an entrance (passage entrance 14) to the protected area HA. Therefore, when a wild boar tries to pass through the passage entrance 14, its sensitive nose will almost certainly come into contact with the bare electric wire 22 stretched at a low position of 30 to 200 mm above the ground, effectively delivering an electric shock to the wild boar and reliably driving it away in the direction of the wild boar habitat area IA. The same is true when the bare electric wire 22 is stretched at a position of 30 to 100 mm.

Furthermore, because wild boars are timid and intelligent animals, once they have received an electric shock, they tend not to approach the area where they received the shock. Therefore, for example, in the early stages of operating the electric shock device 16 and the electric fence 12, it is a good idea to intentionally scatter food near the electric shock device 16 and the electric fence 12 to lure the wild boars and have them experience an electric shock. This will allow the wild boars to learn not to approach the entrance 14 where the electric shock device 16 is installed and the electric fence 12.

When pedestrians, bicycles, and automobiles (two-wheeled and four-wheeled) pass through the entrance 14, they step on the bare electric wire 22 with their shoes or tires. When the bare electric wire 22 is stepped on, the tension of the bare electric wire 22 exceeds a certain value and the electric wire installation device 24 loosens the fixation of the bare electric wire 22, preventing the bare electric wire 22 from breaking. Then, when the tension of the bare electric wire 22 decreases as the pedestrian passes, it automatically returns to its normal state.

When the bare electric wire 22 is stepped on by a shoe or a tire and comes into contact with the ground, unnecessary current flows toward the ground, which may cause the voltage of the high voltage generator 26 to drop. Therefore, it is preferable to configure the high voltage generator 26 to stop outputting when the electric wire installation device 24 loosens the fixation of the bare electric wire 22.

The bare electric wires 22 of the electric shock device 16 are stretched at a height of 30 mm or more above the ground, taking into consideration not only the habits of wild boars, but also, for example, the need to prevent the bare electric wires 22 from touching the ground when they are swayed by a strong wind. Also, the bare electric wires 22 are stretched at a height of 200 mm or less so that even bicycles and cars with small tires can climb over the bare electric wires 22.

As explained above, the wild boar intrusion prevention system 10 is a large-scale system that protects a specific area or village, including multiple fields, by surrounding it with a single electric fence 12, so the total cost can be significantly reduced compared to each resident installing a small system individually. In addition, an entrance 14 is provided in the middle of the electric fence 12 to allow the internal/external traffic road ND to pass through. A unique electric shock device 16 that takes advantage of the habits of wild boars is installed at the entrance 14, so wild boars can be effectively prevented from invading the protected area HA through the entrance 14, and pedestrians and cars can pass through the entrance 14 without hindrance. In addition, the electric shock device 16 has a simple configuration, so it can be installed very inexpensively.

The wild boar intrusion prevention system of this invention is not limited to the above embodiment. For example, the electric shock device 16 shown in Figure 2 has four bare electric wires 22, but the number of bare electric wires may be any number as long as it is one or more. In addition, the structure of the electric wire installation device of the electric shock device is not particularly limited, and can be freely selected from among known structures.

In addition, roads such as the internal and external traffic roads ND are generally sloped so that the center of the width is higher in order to drain rainwater. In such a case, as shown in FIG. 3(a), it is preferable to attach an insulating tube material 28 to an appropriate position (one or more positions) in the length direction of the bare electric wire 22. The insulating tube material 28 is a hollow rubber or resin tubular body having a certain degree of flexibility and shape recovery, and is attached by inserting the bare electric wire 22 into through holes 28a provided at two appropriate positions above the axial center toward the ground side, as shown in FIG. 3(b). The insulating tube material 28 supports the bare electric wire 22 with its lower surface abutting the ground, and maintains the distance between the bare electric wire 22 and the ground at a predetermined value. Therefore, even if the ground is not flat, it is easy to maintain the distance between the bare electric wire 22 and the ground at a predetermined interval. In addition, when the bare electric wire 22 is stepped on by a shoe or a tire, the insulating tube material 28 is easily crushed, so the bare electric wire 22 returns to its original position appropriately, just as when the insulating tube material 28 is not attached.

In the wild boar intrusion prevention system 10, the high-voltage generator 26 for the electric shock device 16 is also used as the high-voltage generator 20 for the electric fence 12, thereby reducing costs. However, if there are circumstances in which it is necessary to adjust the electric shock of the electric shock device 16 and the electric fence 12 separately, it is preferable to provide separate high-voltage generators.

The structure of the electric fence is not particularly limited, and in addition to a structure in which multiple bare electric wires are strung between posts like electric fence 12, it may be a structure in which wire mesh is stretched across the fence. The means for electrically insulating the bare electric wires by separating them from the ground may be a space or an insulator that is partially placed between the wires and the ground. There is no limit to the size or shape of the protected area, so long as it can be divided by the electric fence. Therefore, the wild boar intrusion prevention system of the present invention can be installed in various places and regions, not just mountain settlements.

10 Wild boar intrusion prevention system 12 Electric fence 14 Passage entrance 16 Electric shock device 18, 22 Bare electric wire 20, 26 High voltage generator 24 Electric wire installation device HA Protected area IA Wild boar habitat area ND Inner and outer traffic road

Claims (2)

The electric fence divides a wild boar habitation area and a protected area, and prevents wild boars in the wild boar habitation area from invading the protected area. The electric fence has an opening in the middle to allow an inside-outside traffic road connecting the inside and outside of the protected area to pass through. The electric fence has an electric shock device installed at the opening.
The electric shock device is composed of an electric wire installation device that stretches bare electric wires across the width of the passageway, and a high voltage generation device that applies a high voltage to the bare electric wires,
The electric wire installation device normally supports and fixes both ends of the bare electric wire so that the bare electric wire is suspended at a height of 30 to 100 mm above the ground, and when an external force is applied to the bare electric wire, it relieves the tension of the bare electric wire so that the tension does not exceed a certain value, thereby preventing the bare electric wire from breaking, and when the external force is removed, it performs an operation to return the bare electric wire to its normal state. 2. The wild boar intrusion prevention system according to claim 1, wherein an insulating material is provided midway along the bare electric wire to maintain a predetermined distance between the bare electric wire and the ground.

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