JP2566067Y2 - Safety devices in high-voltage discharge weeders - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, a spark discharge is generated between a weed and a discharge electrode by applying a high voltage between the discharge electrode and a ground electrode and bringing the discharge electrode close to the weed. Then, in the high-voltage discharge weeder configured to wither this weed, the safety of the high-voltage discharge weeder, which prevents an accident such as electric shock due to the residual charge of the capacitor constituting the discharge circuit after the work is completed. It concerns the device.

[0002]

2. Description of the Related Art In this high-voltage discharge weeder, a discharge electrode is mounted at the tip of a rod with a predetermined spark gap formed between the rod and a conductor constituting a discharge circuit. By applying a high voltage between the electrodes and bringing the discharge electrode close to the weeds, the energy stored in the capacitor constituting the discharge circuit is released at the spark gap, and the discharge electrode The energy required for discharge is generated between the weeds and the weeds are killed.

In this high voltage discharge weeding, even if the high voltage applied to the discharge electrode is cut off at the end of the work,
A predetermined amount of electric charge remains in the capacitor. Due to the residual charge of the capacitor, when the discharge electrode mounted on the tip of the operating rod comes into contact with the human body, an electric shock may occur, which is extremely dangerous.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the safety of a high-voltage discharge weeder by preventing electric shock due to the residual charge of a capacitor constituting a discharge circuit after the work is completed. Was made as an issue.

[0005]

In order to solve this problem, a means adopted in the present invention is to form a predetermined spark gap between a rod and a conductor constituting a discharge circuit. A discharge electrode is mounted, a high voltage is applied between the discharge electrode and the ground electrode, and the discharge electrode is brought close to the weed, thereby causing a discharge between the discharge electrode and the weed to reduce the weed. In a high-voltage discharge weeder configured to wither, the discharge electrode can be moved in the longitudinal direction of the rod at the tip of the rod, and the discharge electrode can be moved in a direction in which the spark gap is increased by biasing means. In a state of being biased.

[0006]

When the weeding operation is completed, the high voltage applied to the discharge electrode is cut off, and then the discharge electrode is pressed against the ground, and the discharge electrode is pressed against the rod against the urging force of the urging means. Then, it recedes and comes into contact with the conductor constituting the discharge circuit. As a result, the discharge circuit is short-circuited and current flows,
Since the residual charge of the capacitor is eliminated, there is no electric shock even if the discharge electrode comes into contact with the human body during the handling of the rod after the weeding operation.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. FIG. 1 is a schematic side view of a state in which weeding is being performed by the high-voltage discharge weeder according to the present invention.
FIG. 3 is an enlarged side view of a portion of a housing H attached to a distal end portion of the operation rod R, and FIG. 3 is a view as viewed from an arrow X in FIG. In this high-voltage discharge weeder, a housing H is mounted on the distal end of an operating rod R, and grounding rollers 2 are supported on brackets 1 mounted on both sides of the housing H. In this configuration, weeding work is performed while holding the handle 3 integrally attached to the base end of the R by hand and pushing lightly. Therefore, the operating rod R is
It is rotatable around the ground roller 2 as a fulcrum.

A front portion of the resin housing H is a holder mounting portion 4, and a cylindrical holder 5 is screwed to the holder mounting portion 4. The holder 5 has a shaft center portion formed of a metal bolt, and a conductor 6 for forming a spark gap for forming a spark gap is supported at the front end portion thereof. The rear end portion of the spark gap forming conductor 6 enters the inside of the housing H, and is connected to a conductor 8 connected to a high voltage generator A described later at a portion of a nut 7 screwed to the rear end portion. Connected and a high voltage is applied. Inside the side plates 9 of the housing H, several capacitors C constituting a discharge circuit are mounted. The distal end of the holder 5 has a male screw 5
a is formed. As shown in detail in FIGS. 4, 6 and 7, the discharge electrode mounting member 11 is made of an insulating resin, and has a bottomed cylinder for mounting the rod-shaped discharge electrode 12. A female screw portion 11a is formed on the inner peripheral surface on the opening side of the member, and the female screw portion 11a is screwed to the male screw portion 5a of the holder 5. Further, the discharge electrode mounting member 11 has several heat radiation holes 11b formed in the peripheral wall thereof. The discharge electrode 12
It consists of a sharpened tip of a metal bolt,
The head 12a is disposed inside a bottomed cylindrical discharge electrode mounting member 11, and is slidably inserted into an insertion hole 11d of a bottom 11c of the discharge electrode mounting member 11. A nut 13 is screwed into the tip of the discharge electrode 12, and a washer 14 arranged inside the nut 13 and a discharge electrode mounting member 1 are provided.
A compression spring 15 is elastically mounted between the outer surface of the bottom 11c and the first bottom 11c.

Therefore, the discharge electrode 12 is connected to the compression spring 1.
By the restoring force of 5, the head 12a contacts the inner surface of the bottom 11c of the discharge electrode mounting member 11 via the collar 16,
Thereby, the head 12a of the discharge electrode 12 and the holder 5
A predetermined interval (L) is formed between the spark gap forming conductor 6 and the front end of the spark gap forming conductor 6 that is supported at the center of the spark gap 17. The interval (L) is a spark gap 17 that forms a discharge circuit. In this embodiment, the discharge electrode mounting member 1
By rotating 1, the interval (L) of the spark gap 17 can be adjusted.

Therefore, as shown in FIGS. 1 and 5, the operating rod R is rotated with the ground roller 2 as a fulcrum, so that the discharge electrode 12 mounted on the front end of the housing H is placed on the ground G. When pressed, the rod-shaped discharge electrode 12 retreats against the discharge electrode mounting member 11 on which the discharge electrode 12 is mounted against the restoring force of the compression spring 15, and its head 12a forms a spark gap. It comes into contact with the front end of the conductor for use 6.

As shown in FIG. 1, the above-described high voltage generator A drives the generator by the engine to boost the output voltage by the transformer, or temporarily converts the voltage of the storage battery to AC. This is a device that generates a high voltage by converting the voltage and then increasing the voltage by a transformer, and is mounted on a traveling vehicle 21 having a front wheel 18 made of metal and a rear wheel 19 made of rubber. The high voltage (V ₀ ) generated from the high voltage generator A constitutes the discharge electrode 12 and the ground electrode via a cable 22 connecting the traveling vehicle 21 and the operation rod R. It is applied between the front wheel 18 made of metal. The reason why the front wheels 18 of the traveling vehicle 21 are made of metal is to ground the electrical equipment constituting the high-voltage generator A in this portion to ensure safety.

A switch S for connecting and disconnecting a circuit on the primary side (low voltage side) of the high voltage generator A is attached to the handle 3 mounted on the base end of the operating rod R. For this reason, the above-described discharge circuit is simply illustrated in FIG. In FIG. 8, reference numeral 10 denotes a diode. Further, since a high voltage is supplied to a portion of the housing H mounted on the distal end portion of the operating rod R, and it is dangerous if the insulation of the mounting portion of the electric component is reduced, it is dangerous. The bracket 1 and the part connected to the bracket are all made of metal, and are grounded via the ground roller 2 to ensure safety.

Then, as shown in FIG. 1, the switch S is turned on, and the worker M holds the handle 3 at the base end of the operating rod R and pushes the weeding machine forward to move the weeds to die. If so, the weeding machine is stopped, and the operating rod R is rotated with the ground roller 2 as a fulcrum, and the discharge electrode 12 mounted on the housing H at the tip of the operating rod R is brought close to the weed W. Since the high voltage (V ₀ ) generated from the high voltage generator A is applied between the discharge electrode 12 and the ground roller 2 serving as the ground electrode, the energy stored in the capacitor C is The discharge is caused at the spark gap 17 and a spark discharge occurs between the discharge electrode 12 and the weed W, and the weed W is killed by several discharges.

As described above, the target weeds are discharged one by one and die while pushing and moving the weeder by hand, and after the discharging operation is completed, the weeds are placed on the capacitor C constituting the discharging circuit. Quantitative charge remains. Therefore, if the discharge electrode 12 attached to the distal end of the housing H comes into contact with the worker himself or another person's body for some reason, the electric charge is left by the residual charge of the capacitor C, which is extremely dangerous. . Therefore, in the state shown by the solid line in FIG. 1, the operating rod R is further rotated with the ground roller 2 as a fulcrum, and the discharge electrode 12 at the tip of the housing H is rotated.
Is pressed against the ground G, as shown by the two-dot chain line in FIG. 1 and as shown in detail in FIG. The head 12a is retracted with respect to the discharge electrode mounting member 11 on which the electrode 12 is mounted, and the head 12a contacts the front end of the spark gap forming conductor 6. As a result, the discharge circuit is short-circuited, a current flows through the discharge electrode 12 and the residual charge of the capacitor C disappears, so that the discharge electrode 12 comes into contact with the human body during handling of the operating rod after the weeding operation. No electric shock. Further, when the discharge electrode 12 is separated from the ground G, the restoring force of the compression spring 15 causes the head 12a to come into contact with the inner surface of the bottom 11c of the discharge electrode mounting member 11 via the collar 16 so that a predetermined spark gap 17 is formed. Is formed,
Automatically restore to use.

In the above-described embodiment, the present invention is applied to a high-voltage discharge weeder having a structure capable of adjusting a spark gap. However, the present invention is applied to a weeder having a structure in which the spark gap is invariable. Is also possible. Furthermore, the above-mentioned weeding machine is a hand-pushed type equipped with a ground roller, but the weeding machine to which the present invention is applied is not limited to this type. It is also possible to implement it in a supporting type. Further, the present invention can be applied to a type in which a large number of rods are mounted on a traveling machine and a discharge electrode is mounted on the tip of the rod.

[0016]

According to the present invention, a discharge electrode is mounted at a tip end portion of a rod with a predetermined spark gap formed between the discharge electrode and a conductor constituting a discharge circuit, and a discharge electrode is provided between the discharge electrode and a ground electrode. A high voltage is applied to the discharge electrode to bring the discharge electrode close to the weed, thereby causing a discharge between the discharge electrode and the weed to kill the weed. Since the discharge electrode is attached to the distal end in a state in which the discharge electrode can be moved in the longitudinal direction of the operation rod and the discharge electrode is urged in a direction in which the spark gap increases by urging means, At the end of the weeding operation, when the high voltage applied to the discharge electrode is cut off and the discharge electrode is pressed against the ground against the urging force of the urging means and retracted with respect to the operating rod, the discharge is stopped. The electrode contacts the conductor and shorts the discharge circuit. Current flows in this circuit Te, thereby residual charge of the capacitor is eliminated. Therefore, during the handling of the operating rod after the weeding operation, even if the discharge electrode comes into contact with the human body, electric shock does not occur and it is safe,
When the discharge electrode is separated from the ground, the discharge electrode is returned to the original position by the urging force of the urging means, a predetermined spark gap is formed, and the discharge electrode is restored to a usable state.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a state where a weeding operation is performed by a high-voltage discharge weeder according to the present invention.

FIG. 2 shows a housing H mounted on the distal end of an operation rod R.
It is an enlarged side view of the part.

FIG. 3 is a view taken in the direction of the arrow X in FIG. 2;

FIG. 4 is an enlarged side view of a part of a discharge electrode 12;

FIG. 5 is an enlarged side view of a portion of the discharge electrode 12 in a state where the discharge electrode 12 is pressed against the ground and a discharge circuit is short-circuited.

6 is a perspective view of a part of a discharge electrode 12. FIG.

FIG. 7 is a partially broken enlarged perspective view of a part of a discharge electrode 12.

FIG. 8 is a discharge circuit diagram of the high-voltage discharge weeder according to the present invention.

[Explanation of symbols]

 A: High voltage generator C: Capacitor G: Ground R: Operation rod 6: Conductor for forming spark gap 11: Discharge electrode mounting member 12: Discharge electrode 15: Compression spring (biasing means) 17: Spark gap

Claims (1)

(57) [Scope of request for utility model registration] 1. A discharge electrode is mounted at a tip end of a rod with a predetermined spark gap formed between the discharge electrode and a conductor constituting a discharge circuit, and a high voltage is applied between the discharge electrode and a ground electrode. In a high-voltage discharge weeder having a configuration in which a discharge is caused between the discharge electrode and the weed by causing the discharge electrode to approach the weed by causing the discharge electrode to approach the weed, the discharge is performed at the tip of the rod. An electrode is mounted in such a manner that the electrode is movable in the longitudinal direction of the rod, and the discharge electrode is biased in a direction in which the spark gap is increased by a biasing means. Is pressed against the ground and retracted against the operating rod against the urging force of the urging means, whereby the discharge electrode is brought into contact with the conductor to short-circuit the discharge circuit. Safety in high-voltage discharge weeders All devices.