JPH106275A - Drop preventive net - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drop preventive net to certainly receive any object falling off from a manipulator for high lift work nearby under the manipulator. SOLUTION: A high lift working device has a boom 13 at whose tip a manipulator 20 is installed, and a drop preventive net 30 is furnished under the manipulator 20. The net 30 has body parts 33 and 33' which consist of a pair of net holding members 31 and 31' and a driving member to perform elongation, spreading, and revolution of the net holding members 31 and 31' and is equipped with netting 34 installed in such a way as straddling them 31 and 31'. To execute work with this manipulator 20, the members 31 and 31' are spread and revolved, elongated, and set so that the netting 34 spreads over the under- situated space of the manipulator 20. After completion of the work, the members 31 and 31' are shrunk and folded inward and the drop preventive net 30 is accommodated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention net capable of receiving an object dropped from a manipulator when the manipulator is performing a high place work such as a distribution work of electric wires arranged on a power pole. .

[0002]

2. Description of the Related Art When performing power distribution work such as connection of electric wires disposed on a power pole, a manipulator provided at a tip end of a boom that can be freely moved up and down and expanded and contracted is used. is there. The manipulator includes an arm configured to freely bend and extend and the like, and a gripping device disposed at a distal end of the arm. And, by controlling the bending / extension operation of the arm and the opening / closing operation of the gripping device by the operation of the operator who is on the work table provided at the end of the boom, a desired operation can be performed. ing.

[0003] Here, if the operator who operates the manipulator is immature, the object gripped by the gripping device may be dropped. Further, even a skilled worker, when performing the operation of peeling off the coating of the electric wire (so-called peeling operation), the stripped coating will inevitably fall.
For this reason, when performing the work, the net was spread on the upper part of the utility pole so that the objects falling from the manipulator did not fall to the ground.

[0004]

However, even if the net is spread from the utility pole, when the skinning work is performed between the utility poles, the work position often deviates from the net, and the dropped object cannot be received. There was a problem that there was.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a fall prevention net capable of reliably receiving a fallen object from a manipulator performing work at a high place in the vicinity of the manipulator. And

[0006]

In order to achieve the above-mentioned object, a fall prevention net according to the present invention is provided in a high-altitude working device having a manipulator provided in a lifting / lowering means, in a horizontal direction extending and contracting left and right below the manipulator. A pair of freely configured net holding members are disposed so as to be horizontally pivotable. The net holding member is reduced by driving by the driving member, and is retracted and turned to the vicinity of the base of the manipulator. The operation during is freely configured. Further, a net that is deformable according to the operation between the stored state and the set state of the net holding member and that extends in the space below the manipulator in the set state is attached across the net holding member.

According to the fall prevention net configured as described above, when the net holding member is in the housed state, it is located below the manipulator and near the base end of the manipulator and the net is also folded, so that the net is compact. Can be stored. Further, when the net holding member is in the set state, the net spreads over the space below the manipulator, so that even when an object falls from the manipulator, it can be reliably received by the net.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle to which a fall prevention net according to the present invention is attached will be described with reference to FIGS. The aerial work vehicle 10 has a turntable 12 that is turnable on a vehicle body 11, and a boom 13 that is configured to be extendable and retractable is attached to the turntable 12. It is free. At the tip of the boom 13, a vertical post 16 that can always maintain vertical by a leveling mechanism is attached. The vertical post 16 is provided with a worktable 17 and an attachment member 40 that can be horizontally turned by a turning mechanism. Have been. The manipulator 20 is attached to the upper part of the attachment member 40, and the fall prevention net 30 is attached to the lower part.

The manipulator 20 includes an arm member 21 configured to freely bend and extend and pivot with respect to the mounting member 40.
And a gripping device 22 configured to be able to freely pivot and open and close at the tip of the arm member 21. The operation control of the arm member 21 and the gripping device 22 is performed by the work table 17.
The operation is performed by the operator M operating the operation device 18 provided in. The manipulators 20 are provided on the left and right sides of the mounting member 40, respectively, and this mounting is performed by mounting the base end of the arm member 21 to the mounting member 40.

Next, the fall prevention net 30 will be described with reference to FIGS. 3 and 4. FIG. The fall prevention net 30 is composed of a pair of left and right main body parts 33, 3 comprising a pair of left and right net holding members 31, 31 'and drive members 32, 32' for performing extension / expansion turning operations of the net holding members 31, 31 '.
3 'and a net 34 attached across the net holding members 31, 31'. Body 3
3 and 33 'have the same configuration although the right and left are different, so the configuration will be described below by taking the right main body 33 as an example.

The net holding member 31 is telescopically (nested) extendable and retractable by a plurality of FRP tubes, and a proximal tube member 31 a of the net holding member 31 is attached to a driving member 32. I have. The driving member 32 includes an expansion / contraction device 32a for performing an expansion / contraction operation of the net holding member 31, an air motor 32b for driving the expansion / contraction device 32a, and an opening / closing cylinder 32c.

The telescopic device 32a includes a plastic wire having one end connected to the distal end tube member 31b and disposed in the hollow space of the net holding member 31, and this wire is driven by the air motor 32b. The net holding member 3 by feeding or winding
1 is performed.

The main body 33 is supported by a pivot shaft 35 at the lower surface of the mounting table 41 of the mounting member 40 and below the base end of the manipulator 20 so as to be horizontally pivotable with respect to the mounting table 41. I have. The rod-side end of the opening / closing cylinder 32c is connected to the main body 33, and the bottom-side end of the opening / closing cylinder 32c is attached to the mount 41. Then, by performing the expansion and contraction operation of the opening / closing cylinder 32c, the turning operation from the storage state shown by the solid line to the set state shown by the chain line in FIG. 4 is freely configured.

The opening / closing cylinder 32c is an air cylinder that expands and contracts by air pressure, and operates together with the air motor 32b by controlling the supply and discharge of compressed air supplied from the compressor 37. In this apparatus, an air tank 38 is provided so that the air motor 32b and the opening / closing cylinder 32c can be operated even with a small compressor, and the air stored in the air tank 38 is controlled by a control valve (not shown). Via the air motor 3
2b and the open / close cylinder 32c.

The right body 33 constructed as described above is attached to the right side of the mounting base 41, and the left body 33 '(the constituent members are the same as the body 33). Since they are the same, the same reference numerals are denoted by “′” and their description is omitted). In addition, the main body parts 33 and 33 'are attached to positions slightly outside the left and right manipulators 20. Further, the main body parts 33 and 33 ′ are connected to the net holding members 3.
1, 1 'are arranged with a predetermined space in the front-rear direction so that they do not interfere even if they are stored while being extended to some extent.

The net 34 is attached to the net holding members 31 and 31 'so as to extend over the net 34 (both ends of one net). The net 34 is formed by a string-shaped member made of a synthetic resin into a dimension having a slight slack in the set state where the net holding members 31, 31 'are extended and swiveled, and the net holding members 31, 31' are expanded and contracted. It is free to deform according to each operation without hindering the operation and the turning operation.

The reason why the wire and the net 34 of the expansion and contraction device 32a are formed of synthetic resin (plastic) and the net holding member 31 is formed of an FRP tube is to secure electrical insulation. .

The fall prevention net 30 thus configured
Is controlled by the operation of the remote control box 50 shown in FIG. The remote control box 50 includes a power switch 51, an automatic switch 52, and a manual switch 53. In order to operate the fall prevention net 30, first, the power switch 5
After turning on 1, either the automatic switch 52 or the manual switch 53 is operated.

The automatic switch 52 includes a set switch 52
a and a storage switch 52b. By operating the set switch 52a, the operation of the control valve 39 is controlled in accordance with a predetermined operation sequence, and the operation of the opening / closing cylinder 32c and the air motor 32b is controlled. The fall prevention net 30 in the state is operated to the set state.

The fall prevention net 30 has main bodies 33, 33 'arranged side by side on the same plane in order to reduce the space for storage. For this reason, the main body 33,
It is necessary to perform opening and closing operations so that 33 'does not interfere.
Specifically, from the storage state shown by the solid line in FIG. 4, first, the right opening / closing cylinder 32c is operated to rotate the right net holding member 31 until it is substantially perpendicular to the work table 17 as shown by the chain line. Next, the left opening / closing cylinder 32c '
Is operated to rotate the left-side net holding member 31 'in the same manner, so that the net holding members 31 and 31' are expanded and turned so as to be substantially parallel.

Thereafter, the left and right air motors 32b, 32
By driving b ′, the net holding members 31 and 31 ′ are extended to a predetermined length, and the net 34 is expanded in the space below the manipulator 20. At this time, the amount of extension of the net holding members 31 and 31 'is such that the arm member 21 of the manipulator 20 is fully extended horizontally (in a state where it is not bent).
It is desirable to set the amount of extension slightly longer than the position of the gripping device 22 in.

In the fall prevention net 30 in which the net 34 is expanded as described above, the main body portions 33 and 33 '
Since the manipulators 20 are disposed slightly outside the manipulators 20, the manipulators 20 are set so as to spread with an interval sandwiching the space below the manipulator 20. Thus, since the lower portion of the two manipulators 20 can be covered without fail, even when the manipulator 20 peels the electric wire D, the fallen coating can be reliably received.

When the fall prevention net 30 is set by operating the automatic switch 52 as described above, when it is desired to increase the area of the net 34, the left and right extension switches 54a and 54b of the manual switch 53 are operated. Then, each net holding member 31, 31 'is extended to a desired length. When the fall prevention net 30 cannot be widened, for example, when working near a power pole or moving between a plurality of arranged electric wires, the left and right reduction switches 55a and 55b are operated. The net holding members 31, 31 'are reduced to a desired length. Although not performed in the fall prevention net 30, a configuration may be adopted in which the spread angle of the net holding members 31, 31 'can be adjusted to an arbitrary angle.

After the operation using the manipulator 20, the operation of the storage switch 52b causes the opening / closing cylinder 32c, the air motor 32b, and the like to operate in the reverse order of the setting. In other words, the net holding members 31,
After reducing the length of the net holding member 31 'to a length that does not interfere with the opposing net holding member in the housed state, the left net holding member 31' is first turned, and then the right net holding member 31 is turned. Main body 33, 3
3 'is stored.

In such a stored state, the net holding members 31, 31 'are located near the base end of the manipulator 20, so that the net holding members 31, 31' can be easily stored on the vehicle body even when attached to the aerial work vehicle 10. can do. In addition, even when the manipulator 20 is moved between a plurality of electric wires, the fall prevention net 30 does not interfere, and the manipulator 20 may be moved between the electric wires before setting the fall prevention net 30. Therefore, work can be performed smoothly and efficiently even in a narrow place.

Next, the case where the opening / closing switch 56 of the manual switch 53 is operated to set and store the fall prevention net 30 will be described. In this case as well, in order to prevent interference between the main bodies 33 and 33 'at the time of opening / closing operation, the right open operation switch 56a is first operated to hold the right net as shown by the arrow on the remote control box 50. After turning the member 31, the left open operation switch 56b is operated to turn the left net holding member 31 '.

Thereafter, the nets 34 are stretched by operating the telescopic switches 54 and 55 to extend the net holding members 31 and 31 'to a desired length. After the work is completed, the telescopic switches 54, 55 are operated to reduce the net holding members 31, 31 'to a predetermined length, and then the left closing operation switch 56c is operated to operate the left net holding member 3
After closing 1 ', the right closing operation switch 56d is operated to close the right side net holding member 31, and the fall prevention net 30 is stored.

In the above-described fall prevention net 30, the main bodies 33, 33 'are arranged so as to be shifted back and forth in order to make the shape and dimensions at the time of storage compact, but the main bodies 33, 33' are arranged. May be arranged so as to be shifted vertically. In the case of such a configuration, it is not necessary to consider the order of opening and closing the net holding members 31, 31 '.

The case where the fall prevention net 30 is disposed below the manipulator 20 provided in the vicinity of the work table 17 has been described.
Need not necessarily be arranged near the work table 17. That is, since the fall prevention net 30 according to the present invention is for receiving an object that has fallen from the manipulator 20 performing work at a high place, a work at a high place provided with a manipulator near the end of the boom may be used. . Further, the elevating means for moving the manipulator to a high place may be a vertical elevating type elevating means using a scissor link.

The fall prevention net 3 configured as described above
Although 0 is provided at the tip of the boom 13, it is preferable that the load at the tip of the boom 13 be reduced as much as possible to improve the stability of the vehicle body. For this reason, in the fall prevention net 30, as described above, compressed air is used as a driving source for performing the expansion / contraction and turning operations of the net holding members 31, 33 '. However, the present invention is not limited to this, and may be configured to operate using an electric motor, a cylinder that operates by hydraulic pressure, a motor, or the like.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this fall prevention net 30, a boom 1
In order to reduce the weight of the distal end portion 3 and perform an operation that does not hinder the work, a device for operating the fall prevention net 30 such as the compressor 37 has the following specifications. The compressor 37 is driven by a motor powered by 12 V DC, and is capable of discharging compressed air of 0.99 MPa at 13 l (liter) / min at a rotation speed of 1450 rpm. The compressor 37 has a width of 112 mm, a height of 150 mm, It is formed with a depth of 210 mm. Note that the DC 12 V power supply is used by branching off a power supply for a work lamp used when working the manipulator 20.

The air tank 38 is formed in a cylindrical shape having outer dimensions of 130 mm in diameter and 230 mm in length. The open / close cylinder 32c has a stroke of 60 mm, and is driven at a pressure of 0.5 MPa. The air motor 32b receives a pressure of 0.7 MPa and rotates at 1400 rpm.

With this configuration, the outer dimensions of the main body 33 on one side are such that the width W is 150 mm and the depth D when the net holding member 31 is fully contracted is 280 m.
m and height H can be made as compact as 150 mm. The net holding member 31 has a total length L of 1700 m.
m. Accordingly, if the object is 2.0 kg or less, such as a hand tool or a wire covering, even if the object falls from the manipulator 20 or the workbench 17, the object can be reliably received without damaging the fall prevention net 30. .

[0034]

As described above, the fall prevention net according to the present invention is provided with a net holding member which is extendable and retractable and horizontally pivotable below and below the manipulator, is reduced in size, and is pivoted to the vicinity of the base of the manipulator. An operation between a stowed state and a set state in which the manipulator is extended and expanded so as to spread with an interval sandwiching a space below the manipulator is freely configured. Furthermore, while being freely deformed according to the operation between the stored state and the set state of the net holding member,
In the set state, the net extending in the space below the manipulator is attached to the net holding member. For this reason, even if the manipulator is moved to a desired working position by operating the high-altitude working device, the fall prevention net can be always located in the space below the manipulator, and the movement of the manipulator is accompanied by the movement of the manipulator. There is no need to reset the fall prevention net, and a smooth operation can be performed, and safety during the operation can be ensured. Further, after the work is completed, the manipulator can be stored compactly below the vicinity of the base end of the manipulator, so that the fall prevention net does not obstruct the movement to a narrow work position such as between electric wires.

[Brief description of the drawings]

FIG. 1 is a perspective view of an aerial work vehicle provided with a fall prevention net according to the present invention.

FIG. 2 is a side view of the fall prevention net.

FIG. 3 is a view of the above-mentioned fall prevention net as viewed from an arrow III in FIG. 2;

FIG. 4 is a view of the fall prevention net as viewed from an arrow IV in FIG. 2;

FIG. 5 is a front view of a remote control box for controlling the operation of the fall prevention net.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Aerial work platform 13 Boom (elevation means) 20 Manipulator 30 Fall prevention net 31 Net holding member 32 Drive member 34 Net 50 Remote control box

Claims (1)

[Claims] 1. An aerial work apparatus provided with a manipulator on a lifting means movable to a desired altitude, and a horizontal swivel is freely arranged on the left and right sides below the manipulator in the aerial work apparatus. A pair of net holding members configured to be expandable and contractible in the direction, a retracted state in which the net holding member is reduced and swung to a position near the base of the manipulator, and an interval for sandwiching the net holding member in a space below the manipulator. A driving member for performing an operation between a set state in which the net holding member is extended and expanded and swiveled so as to spread, and attached across the net holding member, wherein the net holding member is in the stored state and the set state. And a net which is deformable in accordance with the operation between the manipulators and extends in the space below the manipulator in the set state. A fall prevention net characterized by that.