JP3935098B2 - Battery-powered work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery-equipped work vehicle including a battery and a charger for charging the battery on a vehicle body.
[0002]
[Prior art]
The battery-equipped work vehicle includes a battery on the vehicle body, and can operate various electric devices in addition to the electric motor that directly or indirectly drives the traveling wheels. When the electromotive force of the battery decreases, it is necessary to charge, but the following two types of battery charging methods are mainly known. One is a system in which the battery is detachable from the vehicle body and is charged by a charger located outside the vehicle body. The other is that the charger is integrated with the battery and mounted on the vehicle body. The electric plug that connects to the charger via the electric cord is inserted into a commercial power outlet outside the vehicle body. In this method, the battery is charged by receiving power supplied from outside the vehicle body via a power outlet.
[0003]
Although the former method requires the work of attaching / detaching the battery to / from the vehicle body and the work of transporting the battery between the place where the charger is located and the place where the car body is located, prepare a plurality of charged batteries. If it is mounted on a vehicle, even if one battery is overdischarged, there is an advantage that traveling or work can be continued by replacing the battery with another battery. On the other hand, the latter method requires the vehicle itself to be moved to a place where there is a commercial power outlet, but there is no need to attach / detach / transport a heavy battery, so that the battery can be easily charged. is there.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-139031
[Problems to be solved by the invention]
However, in the latter battery charging method in the related art, if the power plug is not fully charged when the battery is not charged, the power plug may be exposed to rain or the like to cause corrosion. In addition, after charging was completed, the vehicle was driven forgetting to unplug the power plug from the commercial power outlet, so the power cord or electrical plug could be damaged by cutting the electrical cord, damaging the commercial power outlet or power plug, or traveling wheels. There was also a risk of stepping on the cord and damaging it.
[0006]
The present invention has been made in view of such problems, and extends from a battery-mounted work vehicle that can prevent a situation in which the power plug of the charger is exposed to rain or the like to cause corrosion, and further from the charger. A battery-mounted type that can reliably and reliably prevent situations such as electrical cords being cut, commercial power outlets and power plugs being damaged, and power plugs and electrical cords being stepped on and damaged by running wheels, etc. It aims to provide a work vehicle.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, a battery-mounted work vehicle according to the present invention (for example, a battery-mounted work platform 1 in the embodiment) charges a battery for driving an electric motor on the vehicle body and the battery. power includes a power unit having a battery charger, and inserting the power plug to connect with the charger to the vehicle body outside of the commercial power outlet in the battery-mounted working vehicle to charge the battery, the power unit, at the time of non-charging of the battery to be A standby outlet into which the plug is inserted is provided on the vehicle body, and the power unit is connected to the ground terminal of the power plug only when the power plug is inserted into the standby outlet (for example, the ground terminal 64c in the embodiment). Connected to the first circuit for flowing current from the battery to the traveling vehicle body (for example, the conductors 68a and 69 in the embodiment). , 70), and a second circuit for supplying a current to the electric motor from the battery in response to the fact that at least a current flows (e.g., conductor 68a, 69 a ~69c in the embodiment), the first circuit Includes a plug insertion state notification means (for example, a plug insertion state notification lamp 76 in the embodiment) for notifying the outside that the power plug is inserted into the standby outlet when a current flows through the first circuit. Have.
[0008]
Further, the feeding restricting the battery-mounted working vehicle according to the present invention, power plug is to alert when the regulating the traveling operation of the battery-mounted working vehicle, or the running operating in a state of not being inserted into the standby electrical outlet It is preferable to have a means.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a battery-mounted aerial work vehicle that is an example of a battery-mounted work vehicle according to the present invention. This battery-mounted aerial work vehicle (hereinafter simply referred to as an aerial work vehicle) 1 includes a traveling body 10 provided with traveling wheels 11 at four locations, front, rear, left and right, and a front portion of the traveling body 10 (the paper surface in FIG. A refraction boom 20 provided via a foot pin 13 at the upper end of a boom column 12 provided obliquely upward from the left side in front of the traveling body 10 and a front end of the refraction boom 20. And a work table 40 for boarding an operator.
[0010]
The refracting boom 20 has a base end supported by the boom post 12 and a lower boom 21 having an upper boom support bracket 22 at the distal end, and a base end supported by the upper boom support bracket 22 via a pivot pin 23. The upper boom 24 has an arm support bracket 25 at a part thereof, and a work table support arm 27 having a base end part supported by the arm support bracket 25 via a pivot pin 26 and a work table support post 28 at a distal end part. ing. The lower boom 21 can swing (raise and lower) in the upper and lower surfaces by the expansion and contraction operation of the hoisting cylinder 31 provided between the boom post 12 and the upper boom 24 is bent and stretched between the upper boom support bracket 22 and the upper boom support bracket 22. The cylinder 32 can swing (bend and extend) with respect to the lower boom 21 within the upper and lower surfaces by the expansion and contraction operation. Further, the work table support arm 27 can swing within the upper and lower surfaces by an expansion and contraction operation of a leveling cylinder 33 provided between the work table support arm 25 and the arm support bracket 25.
[0011]
The work table 40 is configured to include a flat floor member 41 and a handrail member 42 provided above the floor member 41, and a post mounting portion 43 provided on the lower surface side of the floor member 41 is provided. A worktable support post 28 is rotatably attached. The work table 40 can be turned horizontally around the work table support post 28 by the rotation operation of the turning motor 34 provided inside the post mounting portion 43.
[0012]
The traveling wheel 11 includes left and right driving wheels 11a and 11a provided in front of the traveling body 10, and left and right driven wheels 11b and 11b provided in the rear of the traveling body 10, and the left and right driving wheels 11a and 11a are respectively provided. It is connected to a rotating shaft (not shown) of a traveling motor 15 (left traveling motor 15a and right traveling motor 15b) provided in the traveling body 10.
[0013]
An operation box 50 is provided on the work table 40, and a work table moving operation device 51 and a travel operation device 52 each including a plurality of levers are provided in the operation box 50. As shown in FIG. 1, the operation signal output by operating the lever of the work table moving operation device 51 is input to the controller 53 provided in the traveling body 10, and the controller 53 controls the electromagnetic control valves V1 and V1 based on these operation signals. V2 and V4 are activated. As a result, hydraulic oil from the hydraulic pump P provided in the traveling body 10 is supplied to the hoisting cylinder 31, the bending / extending cylinder 32, and the turning motor 34, and the hoisting cylinder 31 and the bending cylinder extend and retract, and the turning motor 34 rotates. To do. As a result, the lower boom 21 is raised and lowered, the upper boom 24 is bent and extended, and the work table 40 is horizontally turned. Further, the controller 53 performs electromagnetic control so that the leveling cylinder 33 performs the operation of constantly holding the floor member 41 of the work table 40 in a horizontal posture based on the output from the horizontal detector 44 provided on the work table 40. Actuate valve V3.
[0014]
An operation signal output by operating the lever of the travel operation device 52 is also input to the controller 53, and the controller 53 operates the electromagnetic control valves VL and VR based on these operation signals. As a result, the hydraulic oil from the hydraulic pump P is supplied to the left and right traveling motors 15a and 15b, and the traveling motors 15a and 15b are rotated to drive the left and right drive wheels 11a and 11b. Although not shown, the traveling operation device 52 is also provided with a steering device for steering the left and right drive wheels 11a, 11a. By driving and steering the left and right drive wheels 11a, 11a, a traveling body is provided. 10 can be freely moved and moved.
[0015]
In addition to the hydraulic pump P, the traveling body 10 includes an electric motor M that drives the hydraulic pump P, a battery 61 that supplies electric power to the electric motor M, and a charger 62 that charges the battery 61. A power unit 60 configured as described above is provided. A power plug 64 is provided at the tip of the electric cord 63 extending from the charger 62. The power plug 64 is provided outside the vehicle body (referred to as the vehicle body including the traveling body 10, the bending boom 20 and the work table 40). The battery 61 can be charged via the charger 62 by being inserted into the commercial power outlet C and being supplied with electric power from the outside of the vehicle body via the commercial power outlet C.
[0016]
As shown in FIG. 3, the charger 62 includes a charging circuit 65 and a transformer 66 connected to the charging circuit 65. The transformer 66 includes a primary coil 66a on the electric cord 63 side and a secondary coil on the charging circuit 65 side. 66b. The electric cord 63 includes two conductors 63a and 63b connected to the primary coil 66a of the transformer 66, and a grounding conductor 63c having one end connected to a ground terminal (not shown) on the traveling body 10. The three conductors 63a, 63b, and 63c are connected to the three terminals 64a, 64b, and 64c of the power plug 64 (therefore, the terminal 64c connected to the grounding wire 63c is a ground terminal).
[0017]
In addition to this, a standby outlet 67 is provided in the power unit 60. The standby outlet 67 has three terminals 67a, 67b, and 67c corresponding to the three terminals 64a, 64b, and 64c of the power plug 64, and the power plug 64 is inserted into the standby outlet 67. In this state, the three terminals 64a, 64b, and 64c on the power plug 64 side are respectively fitted to the three terminals 67a, 67b, and 67c on the standby outlet 67 side. The terminal 67c is a ground terminal on the outlet side corresponding to the ground terminal 64c on the power plug 64 side, and the remaining two terminals 67a and 67b are open terminals that are not connected anywhere.
[0018]
Of the two conductors 68 a and 68 b extending from the charging circuit 65 and connected to both the positive and negative poles of the battery 61 and the positive and negative poles of the electric motor M, a branch conductor 69 extends from the conductor 68 a connected to the positive electrode side of the battery 61. This branch conducting wire 69 is connected to a ground terminal on the traveling body 10, and an intermediate portion thereof is provided with a first movable switch piece 71 b (this first movable switch piece 71 b is a first solenoid described later) from the battery 61 side. The first switch 71 that is opened and closed by the electromagnetic force from 71a and the electric motor operation / stop switch piece 73a (this electric motor operation / stop switch piece 73a is provided in the operation box 50 on the work table 40). An electric motor operation / stop switch 73 that is opened / closed by an electric motor operation / stop button (not shown), and a second solenoid 72a (the second solenoid 72a is a second movable member described later). The switch piece 72b is electromagnetically operated). In the following description, of the branch conductors 69, the conductor on the upstream side (battery 61 side) of the first switch 71 is referred to as a conductor 69a, and the first switch 71 and the electric motor operation / stop switch 73 are connected to each other. The conducting wire between them is referred to as conducting wire 69b, the conducting wire between the electric motor operation / stop switch 73 and the second solenoid 72a is referred to as conducting wire 69c, and the conducting wire between the second solenoid 72a and the ground terminal on the traveling body 10 is referred to as the conducting wire. It will be referred to as 69d.
[0019]
A conducting wire 70 extending from the ground terminal 67c of the standby outlet 67 is connected to the upstream side (conducting wire 69a) of the first switch 71 in the branch conducting wire 69, and the first movable switch piece 71b is electromagnetically operated in the middle thereof. A first solenoid 71a is interposed. A second switch 72 that is opened and closed by a second movable switch piece 72b is provided in the middle of the conducting wire 68a extending from the charging circuit 65 (however, the portion between the positive electrode of the battery 61 and the positive electrode of the electric motor M). ing. Further, a plug insertion state notification lamp 76 (see FIG. 1) is provided at a position in parallel with the first solenoid 71a. The plug insertion state notification lamp 76 is provided in the operation box 50 on the work table 40 via a signal cable (not shown) extending through the refraction boom 20, but is drawn in the power unit 60 for convenience of illustration in FIG. 3. is there.
[0020]
In the aerial work platform 1, the battery 61 is charged by inserting the power plug 64 into a commercial power outlet C outside the vehicle body. When the power plug 64 is inserted into the commercial power outlet C, the power supplied via the commercial power outlet C is charged to the battery 61 via the charger 62 (transformer 66 and charging circuit 65). In this way, when the power plug 64 is inserted into the commercial power outlet C, and therefore the power plug 64 is not inserted into the standby outlet 67, no current flows through the plug insertion state notification lamp 76. The plug insertion state notification lamp 76 is kept off. Further, when the power plug 64 is not inserted into the standby outlet 67 in this way, no current flows through the first solenoid 71a (it is not excited), so the first switch 71 is kept open. Therefore, even when the operator S on the work table 40 performs an operation of closing the electric motor operation / stop switch 73, no current flows through the second solenoid 72a (not excited), and the second switch 72 is also opened. Since the state is maintained, the electric current from the battery 61 does not flow through the electric motor M, and the hydraulic pump P is not driven. Accordingly, the traveling wheels 11 are not driven and the vehicle does not travel.
[0021]
When the charging of the battery 61 is completed, the power plug 64 is pulled out from the commercial power outlet C and inserted into a standby outlet 67 provided on the traveling body 10. Thus, in the aerial work platform 1, since the standby outlet 67 into which the power plug 64 is inserted when the battery 61 is not charged is provided on the vehicle body (on the traveling body 10), the charging of the battery 61 is completed. After that, if the power plug 64 is inserted into the standby outlet 67, the terminals 64a, 64b and 64c of the power plug 64 are protected in the standby outlet 67. It is possible to prevent a situation in which the power plug 64 that has been pulled out from the commercial power outlet C after the exposure is exposed to rain or the like to cause corrosion.
[0022]
Further, in this state where the power plug 64 is inserted into the standby outlet 67, the ground terminal 64c of the power plug 64 and the ground terminal 67c of the standby outlet 67 are electrically connected. Are the conductors 68a and 69a, the first solenoid 71a, the conductor 70, the ground terminal 67c on the standby outlet 67 side, the ground terminal 64c on the power plug 64 side, the conductor 63c constituting the electric cord 63, and the ground terminal on the traveling body 10. Through the plug, and a current flows through the plug insertion state notification lamp 76 to light up. As described above, the plug insertion state notification lamp 76 notifies the outside (specifically, to the worker S on the work table 40) whether or not the power plug 64 is inserted into the standby outlet 67. It plays a role as wearing state notification means.
[0023]
Further, in this state where the power plug 64 is inserted into the standby outlet 67, current flows through the first solenoid 71a and is excited, so that the first movable switch piece 71b is attracted to the first solenoid 71a. The first switch 71 is closed. When the operation of closing the electric motor operation / stop switch 73 is performed from this state, the positive electrode of the battery 61 is connected to the conductors 68a and 69a, the first switch 71, the conductor 69b, the electric motor operation / stop switch 73, the conductor 69c, and the second solenoid 72a. Since it is also grounded via the lead wire 69d and the ground terminal on the traveling body 10, a current flows through the second solenoid 72a and is excited. As a result, the second movable switch piece 72b is attracted and the second switch 72 is closed, so that a current from the battery 61 flows through the electric motor M, the electric motor M rotates, and the hydraulic pump P is driven. As a result, the vehicle can move.
[0024]
Thus, in the aerial work platform 1, the first relay composed of the first solenoid 71a and the first movable switch piece 71b and the second relay composed of the second solenoid 72a and the second movable switch piece 72b are connected to the power plug. In the state where 64 is not inserted into the standby outlet 67, the rotation operation of the electric motor M is prohibited, thereby serving as a travel regulation means 75 (see FIG. 1) that regulates the travel operation of the vehicle. In the work place 1 of the aerial work place, the travel restriction means 75 requires that the power plug 64 be inserted into the standby outlet 67 as a condition for enabling the vehicle to travel. Since the vehicle cannot be moved unless the 64 is inserted into the standby outlet 67, the vehicle forgets to unplug the power plug 64 from the commercial power outlet C after charging is completed. Therefore, it is possible to prevent accidents such as disconnection of the electric cord 63, breakage of the commercial power outlet and the power plug, and stepping on the power plug 64 and the electric cord 63 by the traveling wheel 11 to prevent them from occurring. can do.
[0025]
Further, in the aerial work platform 1, the plug insertion state notification lamp 76 that notifies the outside whether or not the power plug 64 is inserted into the standby outlet 67 is provided. By visually checking the plug insertion state notification lamp 76, the person S can run the vehicle now before performing the vehicle start operation (specifically, the operation of the electric motor operation / stop button). It can be easily determined whether the user is in the state (while staying on the work table 40).
[0026]
The preferred embodiments of the present invention have been described so far, but the scope of the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, an example in which the battery and the charger are provided on the traveling body has been described. However, the battery and the charger may not necessarily be provided on the traveling body. (In the above example, it may be on the work table 40, for example).
[0027]
In addition, in the above-described embodiment, a specific device for notifying the operator S whether or not the power plug 64 is inserted into the standby outlet 67 in the plug insertion state notification means is a lamp (plug insertion). The state notification lamp 76) is not necessarily limited to the lamp, but may be a display or the like for notifying the notification content by characters or the like. Further, instead of a visual notification such as a lamp or a display display, an auditory notification such as a buzzer may be used. Further, the state in which the power plug 64 is inserted into the standby outlet 67 is detected by a contact or non-contact method of the power plug 64 inserted into the standby outlet 67 with a limit switch, an infrared switch, or the like. You may do it.
[0028]
In the above-described embodiment, the travel restricting means is configured to restrict the travel operation of the vehicle when the power plug 64 is not inserted into the standby outlet 67. It may be configured to issue an alarm. Further, the configuration of the travel restricting means is not necessarily limited to the configuration including two relays (first relay and second relay) as shown in the above example, and the power plug 64 is inserted into the standby outlet 67. Other configurations may be used as long as the vehicle (battery-equipped work vehicle) has a configuration that restricts the travel operation or warns when the travel operation is performed. In particular, the battery-equipped work vehicle is a track mount type and includes a PTO (a mechanism called a power take-off for taking out part or all of the engine driving force of a vehicle and operating a temporary object on a traveling body, that is, a boom). If the PTO is turned off, or when the parking brake is released, the vehicle can be configured to issue an alarm when it is about to enter the running operation.
[0029]
Further, in the above-described embodiment, the battery-mounted work vehicle according to the present invention has been described as a boom type aerial work vehicle. However, this is an example, and an aerial work vehicle other than the boom type, for example, a scissor device. For example, it may be a vertical lift type aerial work vehicle that simply moves the work table up and down in the vertical direction. Furthermore, a work vehicle other than an aerial work vehicle such as a forklift or a crane vehicle may be used. In the above-described embodiment, an example in which the battery-equipped work vehicle travels using traveling wheels has been described. However, the traveling means of the work vehicle is not limited to such traveling wheels, and may be a crawler device or the like. Absent. Further, as shown in the above-described embodiment, the vehicle travel means is configured to drive a hydraulic pump by an electric motor and operate using hydraulic oil discharged from the hydraulic pump, as well as directly ( A configuration in which the traveling means is operated (without hydraulic pressure) may be employed.
[0030]
【The invention's effect】
As described above, the battery-equipped work vehicle according to the present invention has a standby outlet on the vehicle body into which the battery power plug is inserted when the battery is not charged, so that the charging of the battery is finished. By later inserting the power plug into this standby outlet, the terminal of the power plug can be protected. For example, the power plug removed from the commercial power outlet after charging is exposed to rain and corroded. Can be prevented in advance.
[0031]
In addition, the battery-equipped work vehicle according to the present invention has plug insertion state notification means for notifying the outside whether or not the power plug is inserted into the standby outlet. Before performing the travel start operation, it can be easily determined whether or not the vehicle is currently in a travelable state.
[0032]
Further, the battery-equipped work vehicle according to the present invention has a travel regulation means for regulating the traveling operation of the vehicle in a state where the power plug is not inserted into the standby outlet, or for warning at the time of the traveling operation, The vehicle cannot be moved unless the power plug is inserted into the standby outlet. For this reason, because the vehicle has been driven to forget to pull out the power plug from the commercial power outlet after charging, the power cord or It is possible to reliably and reliably prevent a situation where the electric cord is stepped on and damaged.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a signal transmission system of a battery-mounted work platform that is an example of a battery-mounted work vehicle according to the present invention.
FIG. 2 is a side view of the battery-mounted aerial work vehicle.
FIG. 3 is a diagram showing a detailed configuration of a region III in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Battery mounted high-altitude work vehicle 10 Traveling body 11 Traveling wheel 20 Refraction boom 40 Work table 61 Battery 62 Charger 64 Power plug 67 Standby outlet 71a 1st solenoid 71b 1st movable switch piece 72a 2nd solenoid 72b 2nd movable Switch piece 73a Electric motor operation / stop switch piece 75 Travel restricting means 76 Plug insertion state notification lamp M Electric motor C Commercial power outlet

Claims (2)

A power unit having a battery for driving an electric motor on the vehicle body and a charger for charging the battery, and charging the battery by inserting a power plug connected to the charger into a commercial power outlet outside the vehicle body In a battery-equipped work vehicle that performs
The power unit has a standby outlet on the vehicle body to which the power plug is inserted when the battery is not charged.
The power unit is connected to the ground terminal of the power plug only when the power plug is inserted into the standby outlet, and a first circuit for flowing a current from the battery to the traveling vehicle body, A second circuit for flowing current from the battery to the electric motor in response to the flow of the current, and when the current flows through the first circuit, the power plug is connected to the first circuit. A battery-equipped work vehicle comprising plug insertion state notifying means for notifying the outside that it is inserted into a standby outlet . 2. The vehicle according to claim 1, further comprising a travel regulation unit that regulates a travel operation of the battery-equipped work vehicle in a state where the power plug is not inserted into the standby outlet, or warns when the travel operation is performed. The described battery-powered work vehicle.

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