JP7122224B2 - aerial work platform - Google Patents

Description

The present invention comprises a vehicle having a driving cab at the front of the vehicle body, a swivel base provided at the rear part of the vehicle body so as to be capable of horizontal swivel, a boom attached to the swivel base so as to be able to freely raise and lower, and a boom attached to the tip of the boom. and an aerial work platform.

Such an aerial work vehicle is configured so that the work platform can be moved to a desired high altitude position by operating the swivel base and the boom to carry out work. As a device that drives work equipment such as a swivel base and a boom, it is possible to drive the engine for traveling of the aerial work vehicle, and use the engine power taken out by the PTO mechanism (power take-off mechanism) attached to the transmission. It is known to drive a working device by supplying hydraulic oil discharged from the hydraulic pump to the working device by driving the pump. In such a method of extracting power by driving the engine, the driving sound of the engine may become noise. Therefore, when the vehicle body is equipped with a battery and an electric motor, and the working device is used for work, the engine is stopped, the electric motor is driven by the electric power from the battery, and the hydraulic pump is driven by the electric motor to operate the working device. Those configured to drive are also known (see, for example, Patent Document 1).

Patent No. 3801511

In the aerial work platform as described above, an engine for traveling is arranged below the operating cab, and a hydraulic supply unit such as a hydraulic pump and a hydraulic oil tank is located behind the operating cab in the vicinity of the engine. are arranged. Furthermore, in the conventional aerial work vehicle, a control device for controlling the drive of the work equipment is also arranged on the rear side of the driving cab. Since the position on the rear side of the driving cab is close to the engine for running, it is easily affected by the heat from the engine. Conventionally, a control device, which is an electronic device, was arranged at the rear side of the driving cab, so it was necessary to take measures to reduce the influence of heat from the engine on the control device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an aerial work platform in which a control device is less susceptible to heat from an engine.

In order to solve the above problems, the aerial work platform according to the present invention includes a vehicle having a driving cab in the front part of the vehicle body, a swivel base provided in the rear part of the vehicle body so as to be able to horizontally swivel, and at least the swivel base a boom that can be raised and lowered; a work table that is provided at the tip of the boom; a plurality of hydraulic actuators that operate the swivel base and the boom; and a hydraulic system that supplies hydraulic fluid to the plurality of hydraulic actuators A supply unit and a control device (for example, the control unit 50 in the embodiment) that controls the driving of the plurality of hydraulic actuators are provided. In addition, the hydraulic supply unit has a hydraulic fluid tank that stores hydraulic fluid to be supplied to the plurality of hydraulic actuators, the hydraulic supply unit is disposed on the rear side of the driving cab in the vehicle body, and the A control device is disposed on the vehicle body on the rear side of the hydraulic oil tank and in front of the swivel base.

The aerial work platform configured as described above has a swing hydraulic motor and a swing speed reducer as hydraulic actuators for operating the swivel base, and the swing hydraulic motor and the swing speed reducer are disposed on the rear side of the swivel base. is preferred.

In the aerial work vehicle configured as described above, the hydraulic supply unit includes a hydraulic pump and an electric motor that drives the hydraulic pump, and a battery (for example, the battery unit 121 in the embodiment) for driving the electric motor. an inverter that receives power supplied from the battery and controls operation of the electric motor; and a charger that charges the battery using an external power supply, wherein the inverter and the charger are connected to the vehicle body. It is preferably arranged on the front side of the swivel base.

According to the aerial work vehicle according to the present invention, the control device that controls the drive of the hydraulic actuator is arranged on the front side of the swivel base provided at the rear portion of the vehicle body. Therefore, since the control device, which is an electronic device and is easily affected by heat, is arranged at a position away from the engine arranged on the lower side of the driving cab, the control device is affected by the heat from the engine. erroneous operation can be prevented.

The aerial work vehicle configured as described above preferably has a swing hydraulic motor and a swing speed reducer as hydraulic actuators for operating the swivel base, and the swing hydraulic motor and the swing speed reducer are disposed on the rear side of the swivel base. With such a configuration, it is possible to create a space in which a control device and the like can be arranged on the front side of the swivel base.

The aerial work vehicle configured as described above includes an electric motor for driving the hydraulic pump, a battery for driving the electric motor, an inverter for receiving power supplied from the battery to control the operation of the electric motor, and an external power source. In the case of providing a charger for charging the battery using the inverter, it is preferable that the inverter and the charger are also arranged on the front side of the swivel base provided at the rear part of the vehicle body. With such a configuration, even the inverter and the charger, which have particularly low heat resistance, can be made less susceptible to the heat from the engine.

1 is a side view showing an aerial work platform according to the present invention; FIG. 1 is a plan view showing an aerial work vehicle according to the present invention; FIG. 1 is a perspective view showing an aerial work platform according to the present invention; FIG. FIG. 3 is a side view of a subframe provided in the aerial work platform according to the present invention; FIG. 2 is a block diagram showing a hydraulic control system of the aerial work vehicle according to the present invention; 1 is a perspective view of the aerial work vehicle according to the present invention with a tool box and a cover member removed; FIG. FIG. 7 is an enlarged view of a main part in FIG. 6; 1 is a perspective view of the aerial work vehicle according to the present invention with a tool box removed; FIG. FIG. 9 is an enlarged view of a main part in FIG. 8;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. An aerial work vehicle 1 according to the present invention is shown in FIGS. 1 to 3. FIG. The aerial work vehicle 1 is based on a cab-over type truck vehicle that has a driving cab 7 in the front part of the vehicle body 2 and can travel by front wheels 5f and rear wheels 5r arranged on both left and right sides of the vehicle body 2. there is An engine E for driving the vehicle is arranged below the driving cab 7 in the vehicle body 2 . The vehicle body 2 has a chassis frame 3 extending rearward from the driving cab 7 and a sub-frame 4 mounted on the chassis frame 3 and extending in the front-rear direction.

Outrigger jacks 10 that are expandable/contractible in the horizontal direction and extendable/contractible in the vertical direction are provided on the front, rear, left, and right of the subframe 4, respectively. Outrigger jacks 10 project in the left-right direction and extend downward by outrigger cylinders 11 and jack cylinders 12 (see FIG. 5 ) provided inside to ground the lower ends of outrigger jacks 10 . is configured to support the in a stable state. The vehicle body 2 is provided with a jack operation device 15 (see FIG. 5) having an operation lever or the like for operating each outrigger jack 10 .

A swivel base 20 is provided at the rear portion of the subframe 4 so as to be horizontally swivelable. As shown in FIG. 4, the rear portion of the subframe 4 is provided with a swivel base mounting portion 4a formed one step higher than the other portions, and an annular base ring (not shown) is mounted on the swivel base mounting portion 4a. are fixed with bolts or the like. An annular orbital race 23 is attached to the radially outer side of the base ring so as to be rotatable in the circumferential direction with respect to the base ring. The swivel base 20 is fixed on the swivel race 23 with bolts or the like. Therefore, the swivel base 20 can swivel with respect to the base ring. On the sub-frame 4, plate-shaped reinforcing members 4b are provided that extend forward from both left and right sides of the front surface of the swivel base installation portion 4a. The pair of left and right reinforcing members 4b are members for improving the strength of the swivel base installation portion 4a on which the swivel base 20 is arranged.

A turning gear 23 a is formed on the outer peripheral surface of the turning race 23 . A swing motor 24 and a swing speed reducer 25 are arranged on the rear side of the swivel base installation portion 4a. The turning pinion of the turning speed reducer 25 meshes with the turning gear 23 a of the turning race 23 . When the swing motor 24 is rotationally driven, its rotational speed is reduced by the swing speed reducer 25, and the swing pinion of the swing speed reducer 25 is rotationally driven, whereby the swing race 23 rotates relative to the base ring to swing. The platform 20 is configured to pivot.

As shown in FIGS. 1 to 3, the swivel base 20 includes a substantially disk-shaped base portion 26 fixed on the swivel race 23 and a pair of base portions 26 arranged opposite to each other with a predetermined interval on the base portion 26 . and a support portion 27 . A foot pin 28 is straddled between the upper portions of the pair of support portions 27, and the boom 30 is attached by the foot pin 28 so as to be vertically swingable (freely raised and lowered). A plurality of tool boxes 9 for storing tools, equipment, etc. required for work are arranged on both left and right sides of the sub-frame 4, respectively.

The boom 30 is constructed by telescopically combining a base end boom 30a, an intermediate boom 30b, and a tip boom 30c which are attached to a pair of support portions 27 of the swivel base 20 by means of foot pins 28 so as to be able to rise and fall. The boom 30 is configured to be able to extend and retract in the longitudinal direction by driving a telescopic cylinder 31 (see FIG. 5) provided inside. Further, the boom 30 is configured so that it can be raised and lowered with respect to the swivel base 20 by driving an elevating cylinder 33 that is straddled between the base end boom 30 a and the swivel base 20 .

A lower end of a vertical post (not shown) is attached to the tip of the tip boom 30c via a swing pin. This vertical post is configured to always maintain a vertical posture regardless of the hoisting angle of the boom 30 by a leveling device (not shown). A workbench 40 is mounted on top of the vertical post so as to be pivotable in the horizontal plane via a workbench holding bracket (not shown). An oscillating motor 41 (see FIG. 5) is provided inside the workbench holding bracket. By driving the oscillating motor 41, the entire workbench 40 is horizontally rotated around the vertical post (oscillating operation). ). As described above, the vertical post always maintains its vertical posture, so that the floor surface of the workbench 40 is always kept horizontal regardless of the hoisting angle of the boom 30 .

In the workbench 40, a work operation device 45 including an operation lever for operating the swivel base 20, the boom 30, and the workbench 40, various operation switches, and the like is provided. In the aerial work vehicle 1, a worker on the work platform 40 operates the work operation device 45 to perform operations such as turning the swivel table 20, raising and lowering the boom 30 and extending and retracting the boom 30, and swinging the work platform 40. Operation can be performed, and the workbench 40 can be moved to a desired high position. The work operation device 45 is also provided on the vehicle body 2, so that a worker on the ground or on the vehicle body 2 can operate the swivel base 20, the boom 30, and the work table 40 as well.

In the aerial work vehicle 1 configured as described above, the swing motor 24, the telescopic cylinder 31, the hoisting cylinder 33, the swing motor 41, the outrigger cylinder 11, and the jack cylinder 12 include hydraulic motors and hydraulic motors driven by working hydraulic pressure. Hydraulic actuators such as cylinders are used. The aerial work vehicle 1 is equipped with a hydraulic drive system 100 that supplies operating hydraulic pressure to these hydraulic actuators, and operates the hydraulic drive system 100 based on operation signals from the work operation device 45 and the jack operation device 15 . A control unit 50 for controlling the is mounted. The configuration of these hydraulic control systems will be described with reference to FIG.

When the work operation device 45 or the jack operation device 15 is operated, operation signals from the operation devices 45 and 15 are output to the control unit 50 . When the operation signal is input, the control unit 50 outputs a command signal based on the operation signal to the hydraulic drive device 100, causes the corresponding hydraulic actuator to supply hydraulic oil, and operates at an operating speed corresponding to the operation signal. to operate the swivel base 20, the boom 30, the workbench 40, and the outrigger jacks 10. The control unit 50 also includes a vehicle controller that monitors (controls) the ON/OFF of the start key of the engine E and the start/stop of the engine E. FIG.

The hydraulic drive device 100 is an electric drive type device that drives a hydraulic pump by an electric motor. and a power supply unit 120 of . The hydraulic supply unit 110 includes an electric motor 111 driven by receiving electric power supplied from the electric power supply unit 120, a hydraulic pump 112 driven by the electric motor 111, and a plurality of control valves corresponding to each of the hydraulic actuators AC. It has a control valve unit 113 with V1 to V6 and a hydraulic oil tank 114 .

The hydraulic pump 112 sucks hydraulic fluid from the hydraulic fluid tank 114 and supplies it to the control valve unit 113, and the hydraulic fluid is supplied from the control valve unit 113 to the hydraulic actuator AC. Command signals from the control unit 50 are sent to the control valves V1 to V6 of the control valve unit 113, respectively. The control valves V1 to V6 are configured to control the direction and amount of hydraulic oil supplied to the hydraulic actuator AC according to command signals from the control unit 50, thereby controlling the operation of the hydraulic actuator AC.

The power supply unit 120 includes a battery unit 121 for driving the electric motor 111, an inverter 122 (motor control device) for controlling the operation of the electric motor 111 using the electric power from the battery unit 121, and charging the battery unit 121. It has a charger 123 that The battery unit 121 connects a plurality of batteries such as lead-acid batteries in series, and has a capacity capable of supplying sufficient electric power to perform high-altitude work for one day. The battery units 121 are separately mounted on the left and right at the lower rear portion of the vehicle body 2 (positions on the front side of the rear outrigger jacks 10), and are connected by electric cables (not shown).

The inverter 122 converts the DC power supplied from the battery unit 121 into AC power according to the command signal from the control unit 50 and supplies it to the electric motor 111. number) to control the hydraulic pump 1
It is configured to control the discharge pressure and flow rate of hydraulic oil discharged from 12 . Charger 123 has an outlet plug that can be connected to a power outlet (external power supply). The charger 123 is connected to the power outlet through the outlet plug under predetermined conditions such as when the outlet plug is connected to the power outlet in a business office or the like and the command signal for operating the hydraulic actuator AC is not output from the control unit 50 . It is configured to convert AC power supplied from (an external power source) into DC power having a predetermined voltage and current, and supply the DC power to the battery unit 121 for charging.

In the hydraulic drive system 100 having such a configuration, the hydraulic supply unit 110, the power supply unit 120, and the control unit 50 are collectively arranged at a position on the rear side of the driving cab 7 in the vehicle body 2 in the conventional aerial work vehicle. It had been. However, in the vehicle for high lift work 1 according to the present invention, as shown in FIGS. , and is disposed between the left and right reinforcing members 4b. An optional control unit 60 can be arranged at a position adjacent to the control unit 50. - 特許庁The option control unit 60 is a control device that is added when the control unit 50 cannot cope with the addition of a slope runaway prevention function, a function of automatically installing the outrigger jacks 10, etc. in the aerial work vehicle 1. be. As shown in FIGS. 8 and 9, the vehicle body 2 is provided with a cover member 70 that covers the control units 50 and 60 above, in front, and on the left and right.

The electric motor 111 in the hydraulic pressure supply unit 110 is arranged on the left side of the front portion of the sub-frame 4 and on the rear side of the front outrigger jack 10 . Although not shown, the hydraulic pump 112 is arranged inside the vehicle body 2 relative to the electric motor 111 . The hydraulic oil tank 114 is arranged at a position on the rear side of the electric motor 111 . The inverter 122 and the charger 123 in the power supply unit 120 are arranged on the front portion of the subframe 4 and on the rear side of the driving cab 7 . However, like the control unit 50 , the inverter 122 and the charger 123 may be arranged at a position on the front side of the swivel base 20 (swivel base installation portion 4 a ) in the subframe 4 .

Thus, in the aerial work vehicle 1, the control unit 50 is arranged at a position on the front side of the swivel base 20 provided at the rear portion of the vehicle body 2 (subframe 4). Therefore, the control unit 50, which is an electronic device and is easily affected by heat, is arranged at a position away from the engine E arranged on the lower side of the driving cab 7, so that the control unit 50 is protected from the engine E. Malfunction due to heat can be prevented. In addition, in the aerial work platform 1 , the swing motor 24 and the swing speed reducer 25 are arranged on the rear side of the swivel platform 20 . Therefore, a space in which the control unit 50 and the like can be arranged can be created on the front side of the swivel base 20 .

In addition, in the aerial work vehicle 1, the inverter 122 and the charger 123 in the power supply unit 120 are arranged at the front position on the subframe 4 and at the rear side position of the driving cab 7. As with the control unit 50, it may be arranged at a position on the front side of the swivel base 20 in the subframe 4. The influence of heat from the engine E can be reduced.

Although embodiments according to the present invention have been described so far, the scope of the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, the hydraulic drive system 100 is an electric drive type system in which the hydraulic pump 112 is driven by the electric motor 111. may be configured to drive the hydraulic pump 112 by Furthermore, an engine unit separate from the engine E may be provided, and the hydraulic pump 112 may be driven by this engine unit. Even when changing to PTO drive or engine unit drive, since the control unit 50 is arranged at a position on the front side of the swivel base 20 in the subframe 4, the layout of the control unit 50 and the like can be changed. Hydraulic drive changes can be made without

1 aerial work vehicle 2 vehicle body 7 driving cab 20 swivel base 24 swivel motor 25 swivel reduction gear 30 boom 40 workbench 50 control unit (control device)
100 Hydraulic Drive 110 Hydraulic Supply Unit 111 Electric Motor 112 Hydraulic Pump 120 Power Supply Unit 121 Battery Unit 122 Inverter 123 Charger

Claims (3)

a vehicle having a driving cab at the front of the vehicle;
a swivel base provided at the rear portion of the vehicle body so as to be able to swivel horizontally;
a boom provided at least on the swivel base so as to be freely raised and lowered;
a workbench provided at the tip of the boom;
a plurality of hydraulic actuators respectively operating the swivel base and the boom;
a hydraulic supply unit that supplies hydraulic fluid to the plurality of hydraulic actuators;
a control device for driving and controlling the plurality of hydraulic actuators,
The hydraulic supply unit has a hydraulic fluid tank that stores hydraulic fluid to be supplied to the plurality of hydraulic actuators,
The hydraulic supply unit is arranged on the rear side of the driving cab in the vehicle body,
The aerial work vehicle, wherein the control device is disposed on the vehicle body at a rear side of the hydraulic oil tank and in front of the swivel base. A swing hydraulic motor and a swing speed reducer are provided as hydraulic actuators for operating the swivel base,
2. The aerial work vehicle according to claim 1, wherein said swing hydraulic motor and said swing speed reducer are arranged on the rear side of said swivel platform. The hydraulic supply unit has a hydraulic pump and an electric motor that drives the hydraulic pump,
a battery for driving the electric motor;
an inverter that receives power supplied from the battery and controls operation of the electric motor;
A charger that charges the battery using an external power supply,
3. The aerial work vehicle according to claim 1, wherein the inverter and the charger are arranged on the front side of the swivel base in the vehicle body.

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