JP6122609B2 - Aerial work platform - Google Patents

Description

The present invention relates to an aerial work vehicle having a boom and a workbench attached to the tip of the boom on a vehicle body.

It has a swivel that can be swiveled horizontally on the vehicle body, a boom that is undulated and telescopically attached to the swivel, and a workbench that is swingably attached to the tip of the boom. Boom-type aerial work vehicles, in which workers on board, operate the swivel base and boom to move to the desired height, are widely used for electrical equipment construction, road construction, etc. Yes. Such an aerial work vehicle is configured with a so-called cab-over type truck as a base vehicle, and on the vehicle body behind the driving cab, the above-described boom device, a drive unit for operating the boom device, and a work necessary for the work are provided. A tool box for storing tools, equipment, and the like is arranged so as not to hinder the operation of the boom.

Further, in such an aerial work vehicle, a swivel base is provided in the rear part on the vehicle body behind the driving cab, and the front storage type aerial work vehicle in which the work table is stored in the upper space of the driving cab; There is a rear storage type aerial work vehicle in which a swivel base is provided in a front part on a vehicle body behind a driving cab and a work table is stored in a rear space on the vehicle body behind the driving cab. In these aerial work platforms, the work platform is located on the side of the boom in order to expand the range of work that can be performed while satisfying the structural standards of the vehicle, that is, to secure the maximum boom length within the standard dimensions of the vehicle. It is configured to be stored while being swung. Further, the rear storage type aerial work platform is configured to be stored in a state where the work table is positioned rearward of the rotating shaft of the rear wheel (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Publication No. 5-12495 Japanese Patent Laid-Open No. 2001-97686

By the way, in the aerial work vehicle as described above, an elevating path formed in a staircase shape is provided in order to board a work table stored on the vehicle body. For example, in an aerial work vehicle shown in Patent Document 1, a four-step lifting step is provided obliquely below the work table on the left side of the vehicle body (the side where the retracted work table is located). The upper end of one step is pivoted so that it can be folded. In such an elevating step, when the first step is extended from the folded state when boarding the work table, a space corresponding to the length of the first step is required on the side of the vehicle. Therefore, when the vehicle is parked close to the left side of the road so as not to interfere with other traffic, there are often guard rails, side walls of buildings, etc. on the side of the road. There was a problem that could not be. Also,
On the right side of the vehicle, although a color cone (registered trademark) is installed during work,
Since there is traffic of other vehicles, there is a problem that it is difficult to provide an elevating step in consideration of worker safety.

Therefore, in the aerial work vehicle 100 shown in FIG. 7, on the left side of the vehicle body, a fixed first step 191 provided below the work table 140 and at a rear position of the rear wheel 105r, and the first step 191. Also, an elevating step 190 having second and third steps 192 and 193 provided in front of and above the rear wheel 105r is provided. In such an elevating step 190, the first step 191 is provided below the work table. Therefore, there is a problem that it is difficult to move up and down due to a feeling of pressure when the work table 140 is protruding. Therefore, in the aerial work vehicle shown in Patent Document 2, when riding on the work table, the work table in the retracted state is swung backward to move the work table from above the lifting step and exposed in plan view. It is comprised so that it may board on a work table using the raising / lowering step. However, in such an aerial work vehicle, there is a problem that it takes time to board the work table because the work table is first swung when the work table is boarded.

The present invention has been made in view of the above-described problems, and is provided with a high-elevation path that allows an operator to safely and easily get on the workbench without feeling a sense of pressure from the workbench when moving up and down. The purpose is to provide a work vehicle.

In order to solve the above problems, an aerial work vehicle according to the present invention has a driving cab in a front portion of a vehicle body, and a vehicle capable of traveling with a pair of left and right front wheels and a rear wheel before and after the vehicle body, A swivel that is horizontally swiveled at a front portion of the bodywork area behind the driving cab in the vehicle body, a boom that is undulated on the swivel, and a boom at the tip of the boom. A work table that is swingably mounted, and the boom and the work table are installed in the bodywork area in a state where the boom is tilted backward and the work table is swung to the side of the boom. It is stored in an upper space, and is configured such that the work table is positioned on the rear side of the rear wheel in the retracted state of the boom and the work table, on the bodywork region on the side of the swivel table, The work table in the retracted state is Tool box is disposed on the side location. In addition, on the side of the left and right sides of the vehicle body on which the work table in the retracted state is located, the vehicle is provided in front of the rear wheel, near the rear of the tool box, and below the vehicle body. A first step for raising and lowering the work table; and a position located above the rear wheel and the vehicle body in a side view and between the first step in the front-rear direction and the work table in the retracted state. and a second step for worktable lifting, the first step and the second step, it that is that there is no structure projecting outside of the vehicle with are fixed relative to the vehicle.

According to the aerial work vehicle according to the present invention, on the side of the left and right sides of the vehicle body on the side where the stowed work table is located, the first step provided in front of the rear wheel, and the rear wheel in the side view. An elevating path is provided that includes an upper step and a second step provided between the first step in the front-rear direction and the work table in the retracted state. Therefore, the worker is the first
And when boarding a work table using the second step, it is possible to board the work table safely and easily without feeling a sense of pressure from the work table.

It is a side view showing an aerial work vehicle according to the present invention. It is a top view which shows the aerial work vehicle which concerns on this invention. It is a rear view which shows the aerial work vehicle which concerns on this invention. It is a block diagram which shows the drive mechanism in the aerial work vehicle which concerns on this invention, and the operation mechanism of an aerial work apparatus. It is a figure which shows the raising / lowering step provided in the aerial work vehicle which concerns on this invention, (a) is a perspective view which shows the lower stage of a 1st step and a 2nd step, and a middle stage, (b) is a 2nd step. It is a perspective view which shows an upper stage and a 3rd step. It is a perspective view which shows the work bench | platform provided in the aerial work vehicle which concerns on this invention. It is a side view which shows the conventional aerial work vehicle.

Embodiments of the present invention will be described below with reference to the drawings. Aerial work vehicle 1 according to the present invention
Are shown in FIGS. The aerial work vehicle 1 has a driving cab 7 at the front of the vehicle body 2, and the vehicle body 2
The vehicle is configured based on a truck vehicle that can be driven by a pair of left and right front wheels 5f and rear wheels 5r disposed before and after the vehicle. The vehicle body 2 includes a vehicle body frame that includes a chassis frame 3 and a subframe 4 attached on the chassis frame 3.

As shown in FIG. 4, the aerial work vehicle 1 includes an engine E, an electric motor M directly connected to the engine E, and a power control unit 8 that performs drive control of the engine E and the electric motor M.
A parallel hybrid vehicle. The power control unit 8
The front wheel 5 on the left side of the vehicle body 2 (chassis frame 3) is configured to include a travel controller 8a, a travel inverter 8b, and a travel battery 8c (for example, a nickel metal hydride battery).
It is provided at a position between f and the rear wheel 5r (see FIG. 1). The aerial work vehicle 1 regenerates energy generated when the vehicle is decelerated by the electric motor M and stores it in the traveling battery 8c, and assists the power of the engine E by the electric motor M during acceleration to assist the engine E and the electric motor M. Is transmitted to the left and right rear wheels 5r via the transmission TM and the differential device D.

As shown in FIGS. 1-3, the jack apparatus 10 which lifts and supports the vehicle body 2 is provided in the left and right of the sub-frame 4. The jack device 10 includes a pair of left and right front jacks 10f disposed at the rear positions of the front wheels 5f and 5f and a pair of left and right rear jacks 10r disposed at the rear positions of the rear wheels 5r and 5r. Has been. Front and rear jacks 10f
, 10r are driven downwardly to drive the jack cylinders 11 (see FIG. 4) provided therein, so that the vehicle body 2 is lifted and supported to stabilize the aerial work vehicle 1. It is configured. The vehicle body 2 is provided with a jack operating device 15 (see FIG. 4) including an operation lever for operating the jacks 10f and 10r.

In the front part on the subframe 4 (the front part of the bodywork area behind the driving cab 7 in the vehicle body 2),
A swivel base 20 that is driven by a swivel motor 24 (see FIG. 4) and configured to be horizontally swivelable is provided. The support pins 21, 21 extending upward from the swivel base 20 have foot pins 22.
Thus, the boom 30 is attached so as to be swingable (can be raised and lowered) in the vertical direction. A counterweight (not shown) for stabilizing the vehicle is provided at the rear end of the subframe 4. On the left and right sides of the subframe 4 are tool boxes 2 for storing work tools and work equipment.
6 are provided. In addition, at the rear part on the sub-frame 4, a loading platform 27 for placing work equipment and the like is provided.

The boom 30 is configured by a telescopic combination of a proximal boom 30a, an intermediate boom 30b, and a distal boom 30c, which are attached to the columns 21, 21 by foot pins 22 so as to be raised and lowered. The boom 30 is configured such that the entire boom 30 can be expanded and contracted in the longitudinal direction by driving an expansion cylinder 31 (see FIG. 4) provided therein. Further, the boom 30 is configured to be able to be raised and lowered in the upper and lower surfaces by driving a raising and lowering cylinder 23 straddled between the proximal boom 30 a and the support column 21.

A lower end portion of a vertical post (not shown) is attached to the distal end portion of the distal end boom 30c via a swing pin. This vertical post is configured so that a vertical posture is always maintained by a leveling device (not shown) provided in the boom 30 regardless of the undulation angle of the boom 30. A work table 40 is mounted on the upper part of the vertical post, and a work table holding bracket (not shown).
It is attached so that it can turn freely in a horizontal plane. A swing motor 41 (see FIG. 4) is provided inside the worktable holding bracket. By driving the swing motor 41, the entire worktable 40 is swung horizontally around a vertical post (swing operation). ). As described above, since the vertical post is always maintained in the vertical posture, the floor surface of the work table 40 is always held horizontally regardless of the undulation angle of the boom 30.

In the work table 40, a work operation device 45 including an operation lever for operating the swivel table 20, the boom 30, and the work table 40, various operation switches, and the like is provided. Therefore, in the aerial work vehicle 1, an operator who has boarded the work table 40 operates the work operation device 45 to turn the turn table 20.
The operation operation such as the swiveling operation, the raising and lowering operation of the boom 30 and the swinging operation of the work table 40 can be performed, and the work table 40 can be moved to a desired high position. In addition,
The work operation device 45 is also provided in the vehicle body 2 so that an operator who is on the ground or on the vehicle body 2 can operate the swivel base 20, the boom 30, and the work table 40.

As shown in FIG. 4, the operation mechanism of the jack device 10 and the aerial work device (such as the above-described boom 30) provided in the vehicle body 2 receives operation signals from the jack operation device 15 and the work operation device 45. A controller 50 for controlling the operation of the jack device 10, the swivel base 20, the boom 30 and the work table 40, the jack cylinder 11, the swivel motor 24, and the hoisting cylinder 23
, Telescopic cylinder 31, swing motor 41 (hereinafter collectively “hydraulic actuator 55”
A hydraulic unit 60 for supplying hydraulic oil for operating the hydraulic unit 60, and a hydraulic unit 60
And a working battery 70 for driving the (hydraulic actuator 55). The controller 50 receives operation signals from the jack operation device 15 and the work operation device 45.

The hydraulic unit 60 includes a pump drive motor 61 driven by receiving electric power supplied from the work batteries 70 and 70 via the inverter 71, a hydraulic pump 62 driven by the pump drive motor 61, and a hydraulic actuator 55. It has the control valve 63 provided corresponding to each. The hydraulic pump 62 sucks hydraulic oil from the oil tank T and sends it to the control valve 63, and the hydraulic oil is supplied from the control valve 63 to the hydraulic actuator 55. A control signal is sent from the controller 50 to the control valve 63. The control valve 63 is configured to control the operation of the hydraulic actuator 55 by controlling the supply and discharge of the hydraulic oil supplied from the hydraulic pump 62 to the hydraulic actuator 55 in accordance with a control signal from the controller 50.

The work batteries 70 and 70 are batteries for electrically driving the pump drive motor 61 (
For example, a lead-acid battery), as shown in FIGS. 1 and 3, the rear wheels 5 in the subframe 4
r and 5r are provided at rear positions. Further, the work batteries 70 and 70 are provided so as to have a symmetrical positional relationship with respect to the central axis of the vehicle (see FIG. 3). The work batteries 70 and 70 are charged by the generated power of the work generator 72 that is always driven to generate power when the engine E is running. The working battery 70
, 70 is a battery different from the vehicle battery 80 existing in the vehicle body 2 for electrically driving the starter motor of the engine E and the traveling battery 8c in the power control unit 8 (hybrid unit). The working generator 72 is a generator different from the existing alternator 81 for the vehicle body 2 that is driven by the engine E to supply the generated power to the vehicle battery 80.

In the aerial work platform 1, as shown in FIGS. 1 to 3, the boom 30 and the boom 30 in a state where the boom 30 is swung to the left of the boom 30 by tilting backward after the boom 30 is fully contracted. Work table 4
0 is stored in the upper space of the bodywork area (subframe 4) behind the driving cab 7 in the vehicle body 2. Further, in the state where the boom 30 and the work table 40 are stored in this manner, the work table 40 is configured to be located on the rear side of the rear wheel 5r (behind the rotating shaft of the rear wheel 5r).

The aerial work vehicle 1 is provided with an elevating step 90 for an operator to get on and off between the work table 40 thus stored and the ground. The raising / lowering step 90 is located in front of the rear wheel 5r (positioned between the power control unit 8 and the rear wheel 5r) on the side (left side) where the work table 40 in the retracted state is located in the subframe 4 (vehicle body 2). And the first step 91 provided below the tool box 26, and the first step 91 in the front-rear direction and the retracted state positioned above the rear wheel 5r in a side view on the subframe 4 Working table 4
A second step 92 provided between 0 (positioned behind the tool box 26) and a third step provided on the proximal boom 30a located above the second step 92 in a side view. And step 93.

As shown in FIG. 1 and FIG. 5, the first step 91 is formed in a ladder shape having a step board between front and rear flat plates, and is configured such that the step board is positioned in front of the rear wheel 5r. First
The plate material 91f extending vertically above the front side of the step 91 constitutes a partition plate that forms a space for arranging the power control unit 8 (hybrid unit). Further, the plate material 91r extending vertically on the front side of the first step 91 constitutes a tire guard that covers the rear wheel 5r. The second step 92 includes a flat plate-like lower step 92a provided on the left end side on the subframe 4, a step-like intermediate step 92b provided on the center side of the subframe 4 with respect to the lower step 92a, and a middle step. It is configured in a three-step staircase shape having a step-like upper step 92c provided closer to the center of the subframe 4 than 92b. That is,
The tread of the middle step 92b is arranged above the lower step 92a (tread), and the tread of the upper step 92c is arranged above the tread of the middle step 92b. The third step 93 is a plate-like step provided on the proximal boom 30a.
The tread on the upper surface of the third step 93 is configured to be substantially horizontal when the proximal boom 30a in the retracted state is inclined obliquely downward. As shown in FIG. 2, the lower to upper steps 92a to 92c and the third step 93 of the second step 92 are arranged in a straight line in the left-right direction of the vehicle body 2 as shown in FIG. . In addition, the lower to upper steps 92a to 92c and the third step 93 of the second step 92 are each configured to have a front and back tread surface on which both feet can be placed.

In the ascending / descending step 90 configured as described above, the worker on the ground puts his / her feet in the order of the first step 91, the lower step 92a in the second step 92, the middle step 92b, the upper step 92c, and the third step 93. Ascending to the base end boom 30a in the vicinity of the work table 40, the user can board the work table 40 from the base end boom 30a. At this time, the first step 91 is provided at the front position of the rear wheel 5r, and the second step 92 is a position above the rear wheel 5r and at the front-rear position between the first step 91 and the work table 40 in the retracted state. Therefore, the operator can work safely and easily without feeling a feeling of pressure from the work table 40 in the retracted state when boarding the work table using the first and second steps 91 and 92. The board 40 can be boarded. Moreover, when getting off the ground from the work table 40, it is possible to get off the ground safely and easily using the steps in the reverse order.

Further, in the aerial work platform 1, as shown in FIGS. 2 and 6, the work table 40 has a predetermined height from the floor surface of the work table 40 at the corner near the third step 93. A fourth step 94 having a tread surface substantially parallel to the floor surface is provided. By using the fourth step 94, it is possible to easily move between the base boom 30 a and the work table 40.

In the aerial work vehicle 1, as in the conventional aerial work vehicle 100 shown in FIG. 7, a counterweight (not shown) for stabilizing the vehicle is provided at the rear end of the vehicle body 2 (subframe 4). Although it is provided, work batteries 70 and 70, which are heavy objects, are rearranged on the rear end side of the vehicle body 2 with respect to the conventional aerial work vehicle 100 and are disposed closer to the counterweight (conventional conventional vehicle). In the aerial work platform 100, work batteries 170, 170 are provided between the front wheel 105f and the rear wheel 105r). Therefore, a part of the counterweight is used as work batteries 70 and 7.
The weight of 0 can be substituted, and the weight of the counterweight can be reduced.

Although the embodiment according to the present invention has been described so far, the scope of the present invention is not limited to that shown in the above-described embodiment. For example, in the above-described embodiment, the jack device 10, the swivel base 20, and the boom 30 have been described as being operated by a hydraulic actuator that is driven by hydraulic oil from the hydraulic pump 62. It is good also as a structure act | operated by the electric actuator driven by the electric power supply from. In the above-described embodiment, the configuration in which the work generator 72 is provided and the work batteries 70 and 70 are charged by the generated power of the work generator 72 has been described. It is good also as a structure provided with the charger which charges 70,70.

1 High-altitude work vehicle 2 Car body 4 Subframe (mounting area)
5f, 5f Front wheel 5r, 5r Rear wheel 7 Driving cab 20 Swivel table 30 Boom 40 Work table 90 Lifting step 91 First step 92 Second step

Claims (1)

A vehicle having a driving cab at the front of the vehicle body and having a pair of left and right front wheels and a rear wheel at the front and rear of the vehicle body, and a horizontal turn at the front of the bodywork area behind the driving cab in the vehicle body A swivel provided freely, a boom attached to the swivel so as to be raised and lowered, and a workbench attached to a tip of the boom so as to be swingable with respect to the boom. The boom and the workbench are stored in the upper space of the bodywork area in a state where the workbench is swung to the side of the boom and the workbench is stored in the upper space of the bodywork region. A work table is configured to be located on the rear side of the rear wheel, and a tool box is disposed on the bodywork region on the side of the swivel table and on the side where the work table in the retracted state is located. In the aerial work vehicle
For raising and lowering the workbench provided on the left or right side of the vehicle body on the side where the workbench in the retracted state is located, in front of the rear wheel, near the rear of the tool box, and below the vehicle body And a work table lifting / lowering provided above the rear wheel and the vehicle body in a side view and between the first step in the front-rear direction and the work table in the retracted state. And the first step and the second step are fixed with respect to the vehicle and are configured not to protrude outside the vehicle. Work vehicle.

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