JP2014024659A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle for high lift work capable of facilitating turning operation of a bucket.SOLUTION: A vehicle 1 for high lift work includes: a bucket 50 and a lifting device 60 pivotally supported by a support post 40 provided at a tip of a boom 30; turning driving means 67 for turning the lifting device 60; switching means 68 for switching the lifting device 60 between a lock state where the lifting device can be turned only by the turning driving means 67, and a free state where the lifting device can be freely turned by external force; and travel restriction means 70 for restricting travel of the vehicle when the lifting device 60 is in the free state. Since switching the lifting device 60 into the free state makes the lifting device be pushed by the bucket 50 and turn, turning operation of the bucket 50 is easy. Even when the vehicle is tried to be made to run, with the lifting device 60 being kept in the free state, the travel of the vehicle is restricted by the travel restriction means 70, and thereby safety is assured.

Description

  The present invention relates to an aerial work vehicle. More specifically, the present invention relates to an aerial work vehicle provided with a lifting device in the vicinity of a bucket.

For example, an aerial work vehicle for power distribution work is provided with a lifting device composed of a winch and a jib in the vicinity of a bucket in order to lift equipment such as a transformer attached to a power pole (for example, Patent Document 1).
Such an aerial work vehicle is provided with a support column in which the posture is maintained in the vertical direction via a leveling cylinder at the tip of the boom, and a bucket and a lifting device are respectively provided on the support column so as to be able to turn. Therefore, the lifting device may interfere when the bucket is swung to a desired position. In such a case, there is a problem that it is necessary to turn the bucket after the worker has turned the lifting device to a position where the lifting device does not interfere in advance, and the turning operation is complicated.

JP 2001-171989

  In view of the above circumstances, an object of the present invention is to provide an aerial work vehicle in which a bucket turning operation is easy.

An aerial work vehicle according to a first aspect of the present invention includes a support provided at a tip of a boom, a bucket supported by the support, a lifting device supported by the support, and the lifting device as an axis. When the turning drive means for turning, the switching means for switching the lifting device between a locked state that can be turned only by the turning drive means and a free state that can be turned freely by an external force, and when the lifting device is in the free state And a travel restricting means for restricting the travel of the vehicle.
The aerial work vehicle according to a second aspect of the invention includes the outrigger according to the first aspect of the invention, and the travel restricting means restricts the outrigger from being stored from a grounded state when the lifting device is in the free state. It is characterized by doing.
According to a third aspect of the present invention, the aerial work vehicle includes a drive source for traveling the vehicle according to the first aspect of the invention, and the travel restriction means prevents the drive source from starting when the lifting device is in the free state. It is characterized by limiting to.
The aerial work vehicle according to a fourth aspect of the present invention is characterized in that, in the first aspect, the travel restriction unit includes a warning unit that issues a warning when the lifting device is in the free state.

According to the first aspect of the invention, if the lifting device is switched to the free state, the lifting device is pushed by the bucket and turns, so that a complicated operation is unnecessary and the turning operation of the bucket is easy. In addition, even if an attempt is made to travel the vehicle while the lifting device is in a free state, the vehicle travel is restricted by the travel restricting means, and the vehicle cannot travel unless the lifting device is locked. There is no safety.
According to the second invention, even if the vehicle is driven while the lifting device is in a free state, the outrigger remains grounded and the vehicle cannot be driven, and the vehicle cannot be driven unless the lifting device is locked. The lifting device is safe without turning while the vehicle is running.
According to the third aspect of the present invention, even if an attempt is made to travel the vehicle while the lifting device is in a free state, the drive source is not started and the vehicle cannot travel, and the vehicle cannot travel unless the lifting device is locked. It is safe without the lifting device turning during traveling.
According to the fourth aspect of the invention, the warning means causes the worker to notice that the lifting device is in the free state, so that the vehicle travels after the lifting device is locked, and the lifting device does not turn while the vehicle is traveling. , Safe.

1 is a side view of an aerial work vehicle according to a first embodiment of the present invention. It is an enlarged view of the bucket and lifting device part of the aerial work vehicle. It is an internal structure figure around the support | pillar of the aerial work vehicle. It is explanatory drawing of the switching lever of the aerial work vehicle, (a) is a locked state, (b) is a free state. It is a block diagram of the traveling control means of the aerial work vehicle.

Next, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
First, an aerial work vehicle 1 according to a first embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 10 denotes a vehicle, and the vehicle 10 is provided with a driving source for driving the vehicle, a driver's cab, an outrigger 11 that ensures stability during work, outside the wheels. A swivel base 20 is mounted on the rear side of the loading platform of the vehicle 10, and can be turned 360 ° in a horizontal plane by a hydraulic motor or the like.

  A boom 30 is attached to the swivel base 20 so as to be raised and lowered. The boom 30 includes a main boom 31 on the base end side and a plurality of sub booms 32 and 33 that are telescopically inserted into the main boom 31. In the illustrated example, the number of sub booms 32 and 33 is two, but may be one or three or more. The expansion and contraction of each sub boom 32, 33 is performed by a hydraulic cylinder.

  A base end portion of the main boom 31 is pivotally supported by the swivel base 20, and a hoisting cylinder 34 composed of a hydraulic cylinder is attached between the main boom 31 and the swivel base 20. When the hoisting cylinder 34 is extended, the boom 30 is raised, and when the hoisting cylinder 34 is contracted, the boom 30 is lowered.

  As shown in FIG. 2, a column 40 is provided on the boom head 33 h formed at the tip of the boom 30, that is, the tip of the sub boom 33. The support column 40 has a bracket 41 provided at the lower end thereof supported by a boom head 33h by a support shaft 42, and can swing within the same plane as the boom undulation surface. Further, a leveling cylinder 43 is interposed between the lower end of the bracket 41 and the boom head 33h. The leveling cylinder 43 expands and contracts in accordance with the hoisting and lowering of the boom 30 by the hoisting cylinder 34, so that the axis of the support column 40 is always maintained in the vertical direction regardless of the change in the hoisting angle of the boom 30.

  A saddle-like bucket 50 on which a worker can ride and a lifting device 60 including a winch 61 and a jib 62 are pivotally supported on the support column 40 so as to be able to turn in a horizontal plane. The lifting device 60 can lift equipment such as a transformer attached to the utility pole.

  As shown in FIG. 3, a bucket support frame 51 is attached to the lower portion of the support column 40 through a bearing so as to be rotatable in a horizontal plane. A bucket 50 is attached to the swing end of the bucket support frame 51. The bucket support frame 51 is provided with a bucket turning motor 52, and can be turned around the support column 40 by driving thereof. That is, the bucket 50 can be turned around the support column 40 by driving the bucket turning motor 52.

  A base 63 is attached to the upper end of the support column 40 through a bearing so as to be rotatable in a horizontal plane. A support arm 64 is pivotally supported at the upper end of the base 63 and can swing within a vertical plane. A jib support frame 65 is pivotally supported at the upper end of the support arm 64 and can swing within a plane perpendicular to the axis of the support arm 64 (in a horizontal plane in FIG. 3). A winch 61 and a jib 62 are fixed to the jib support frame 65.

  A jib hoisting cylinder 66 composed of a hydraulic cylinder is attached between the base 63 and the support arm 64. When the jib hoisting cylinder 66 is contracted, the jib 62 falls horizontally (the state shown in FIG. 3), and when the jib hoisting cylinder 66 is extended, the jib 62 stands vertically (see the arrow y). The jib 62 can be maintained at any undulation angle between the horizontal state and the vertical state.

The base 63 is provided with a jib turning motor 67. The shaft of the jib turning motor 67 is parallel to the support column 40, and a pinion gear 67 a provided on the shaft is engaged with a gear 67 b fixed to the upper portion of the support column 40. Therefore, the lifting device 60 can be turned around the support column 40 by driving the jib turning motor 67.
The jib turning motor 67 corresponds to the turning drive means described in the claims.

  As shown in FIG. 4, the base 63 is provided with a substantially L-shaped switching lever 68 that can swing around its corner. One end of the switching lever 68 is connected to the shaft portion of the slider 69. The shaft portion of the slider 69 is inserted into a cylindrical portion formed on the base 63 and is slidable in the vertical direction in parallel with the shaft of the support column 40. Therefore, the slider 69 can be moved up and down by swinging the switching lever 68. The slider 69 is provided with a U-shaped clamping member 69a that sandwiches the pinion gear 67a of the jib turning motor 67 from above and below. On the other hand, the pinion gear 67a is spline-coupled to the shaft of the jib turning motor 67, and rotates together with the shaft and is slidable in the axial direction of the shaft. Therefore, when the switching lever 68 is swung, the slider 69 moves up and down, and the pinion gear 67a can move up and down. Then, the state can be switched between the state in which the pinion gear 67a is engaged with the gear 67b fixed to the support column 40 (see FIG. 4A) and the state in which the engagement is removed (see FIG. 4B).

In the state where the pinion gear 67a is engaged with the gear 67b, the lifting device 60 can be turned by driving the jib turning motor 67, and the turning is restricted by the jib turning motor 67 even if an external force is applied to the lifting device 60. Further, when the pinion gear 67a is not engaged with the gear 67b, the lifting device 60 can freely turn, and when an external force is applied to the lifting device 60, the lifting device 60 turns according to the external force. That is, with the switching lever 68, the lifting device 60 can be turned only by the jib turning motor 67 (hereinafter referred to as a locked state) and can be freely turned by an external force (hereinafter referred to as a free state). And can be switched.
The switching lever 68 and the slider 69 correspond to switching means described in the claims.

  The aerial work vehicle 1 takes a running posture as shown in FIG. 1 when the vehicle is running. That is, the boom 30 is fully contracted and is laid down so that its tip is located above the cab of the vehicle 10. Further, the posture of the bucket 50 is set so as to be substantially orthogonal to the axial direction of the boom 30, and the lifting device 60 is set to a posture in which the jib 62 is disposed on the vehicle rear side of the bucket 50. The lifting device 60 assumes the above posture by vertically raising the jib 62 by the jib hoisting cylinder 66 and further turning the jib support frame 65 with respect to the support arm 64 (see FIG. 3).

  In addition, after working the outrigger 11 at work, the aerial work vehicle 1 extends, stands up, and turns the boom 30 to move the bucket 50 to a desired position. Further, the bucket 50 can be turned to a desired position by the bucket turning motor 52. When the lifting device 60 is used, the jib support frame 65 is turned with respect to the support arm 64 to erect the jib 62 vertically, and the jib hoisting cylinder 66 lies down horizontally (see FIG. 3). Further, the lifting device 60 can be turned to a desired position by a jib turning motor 67.

  Here, when trying to turn the bucket 50 to a desired position, the lifting device 60 may interfere. However, if the lifting device 60 is switched to the free state by the switching lever 68, the lifting device 60 is pushed by the bucket 50 and turns even if the bucket 50 turns to a position where it comes into contact with the lifting device 60. Therefore, a complicated operation of turning the bucket 50 after turning the lifting device 60 in a position not interfering in advance is unnecessary, and the turning operation of the bucket 50 is easy.

  By the way, if the vehicle 10 is traveled while the lifting device 60 is switched to the free state, the lifting device 60 may turn due to the vibration or inertial force of traveling, and the jib 62 may contact other parts. Therefore, when the vehicle is traveling, the lifting device 60 needs to be locked so as not to turn. In this regard, the aerial work vehicle 1 of the present embodiment has a travel restriction unit described below, and is safe because the travel restriction unit restricts the vehicle travel when the lifting device 60 is in a free state. is there.

As shown in FIG. 5, the travel control means 70 of the present embodiment includes a limit switch 71 and a hydraulic circuit control device 72 that operates the outrigger 11.
As shown in FIG. 4, the limit switch 71 is provided in the vicinity of the switching lever 68. When the switching lever 68 is tilted in the locked state, the limit switch 71 is pushed (see FIG. 4A), and the switching lever When 68 is tilted in the free state, it moves away from the limit switch 71 (see FIG. 4B). Thereby, it can be detected by the limit switch 71 whether the lifting device 60 is in a free state or a locked state. In addition to the limit switch, other detection means such as a proximity switch may be used as long as it can detect whether the lifting device 60 is in a free state or a locked state.

  The limit switch 71 is connected to the control device 72. Based on the signal from the limit switch 71, the control device 72 controls the outrigger 11 not to be stored from the grounded state when the lifting device 60 is in the free state.

  Even if an attempt is made to travel the vehicle with the lifting device 60 in the free state by the traveling control means 70 described above, the outrigger 11 remains grounded and the vehicle cannot travel, and the vehicle must be brought into the locked state. I can't run. Therefore, it is safe without the lifting device 60 turning during traveling of the vehicle.

(Second Embodiment)
For example, when a vehicle engine and a work engine for operating the boom 30 are provided separately, or when the vehicle is driven by the engine and the work is electrically driven, the vehicle drive source And the driving source for work are provided separately, the traveling control means may have the following configuration.
That is, in the travel control means 70 in the first embodiment, the limit switch 71 is connected to the engine control unit of the vehicle travel engine instead of the control device 72. Based on the signal from the limit switch 71, the engine control unit controls the vehicle running engine not to start when the lifting device 60 is in a free state.

  If it is said traveling control means, even if it tries to drive the vehicle with the lifting device 60 in the free state, the vehicle traveling engine does not start and the vehicle cannot travel, and the lifting device 60 is not locked. And the vehicle can not run. Therefore, it is safe without the lifting device 60 turning during traveling of the vehicle.

(Third embodiment)
The travel control means of the first embodiment and the second embodiment is means for physically making vehicle travel impossible, but may be configured to limit vehicle travel by issuing an alarm to an operator. .
That is, alarm means such as an indicator lamp and a buzzer are provided in the cab of the vehicle 10, and the alarm means and the limit switch 71 are connected. When the lifting device 60 is in a free state, a warning is generated by light or sound.

  In the present embodiment, the warning means causes the worker to notice that the lifting device 60 is in a free state, so that the vehicle travels after the lifting device 60 is locked. Therefore, it is safe without the lifting device 60 turning during traveling of the vehicle.

(Other embodiments)
The travel control means is not limited to the above-described embodiment, and any means can be used as long as the vehicle travel can be restricted when the lifting device 60 is in a free state. A plurality of types of travel restriction means may be combined, such as a combination of the travel control means for controlling the outrigger 11 in the first embodiment and the travel restriction means having the alarm means in the third embodiment.

  Further, the lifting device 60 of the above embodiment is a form in which the jib 62 is fixed to the jib support frame 65, but the form in which the jib 62 is detachably provided on the jib support frame 65 may be used. In this case, the jib 62 is removed from the jib support frame 65 and stored on the vehicle 10 side when the vehicle travels, and the jib 62 stored on the vehicle 10 side is attached to the jib support frame 65 when working using the lifting device 60.

DESCRIPTION OF SYMBOLS 1 High-altitude work vehicle 10 Vehicle 11 Outrigger 20 Swivel base 30 Boom 40 Strut 50 Bucket 51 Bucket support frame 52 Bucket swing motor 60 Lifting device 61 Winch 62 Jib 63 Base 64 Support arm 65 Jib support frame 66 Jib hoisting cylinder 67 Jib swing Motor 68 switching lever 69 slider 70 travel control means 71 limit switch 72 control device

Claims (4)

A post provided at the tip of the boom;
A bucket pivotally supported on the column;
A lifting device pivotally supported on the column;
Swivel drive means for swiveling the lifting device around the support;
Switching means for switching the lifting device between a locked state that can be turned only by the turning drive means and a free state that can be turned freely by an external force;
An aerial work vehicle comprising: travel restriction means for restricting vehicle travel when the lifting device is in the free state. With an outrigger,
The aerial work vehicle according to claim 1, wherein the travel restriction means restricts the outrigger from being stored from a grounded state when the lifting device is in the free state. It has a drive source for running the vehicle,
The aerial work vehicle according to claim 1, wherein the travel restricting means restricts the drive source from starting when the lifting device is in the free state. The aerial work vehicle according to claim 1, wherein the travel restriction unit includes a warning unit that issues a warning when the lifting device is in the free state.

Images