JP4181968B2 - Vehicle equipped with work equipment - Google Patents

Description

  The present invention relates to an improvement of a vehicle equipped with a work device that performs a predetermined work in a stopped state.

  In a vehicle such as a passenger car, wearing a seat belt is required during traveling to ensure the safety of passengers. And in order not to forget to wear the seat belt, a technique has been developed in which the engine cannot be started unless the seat belt is worn (see, for example, Patent Documents 1 to 3).

By the way, in a vehicle equipped with a work device that performs a predetermined work in a stopped state such as a cargo handling vehicle, it is dangerous to move the work device while traveling, so use a shift position signal or a side brake signal. In other words, the work can be performed only when the shift position is parked or neutral, or when the side brake is applied.
JP-A-7-186886 (2nd page, FIG. 1) JP-A-8-150894 (page 4, FIG. 1) Japanese Patent Laid-Open No. 11-5513 (page 3, FIG. 1)

  However, the place where the shift position signal and side brake signal are taken out is the engine peripheral part, and the engine control circuit and the like involved in running are stretched around it. This can cause serious troubles.

  The present invention has been made in view of the above points, and the object of the present invention is to input a signal from a place that does not affect traveling and consider that the vehicle is in a stopped state (work ready state), and only at this time. It is to be able to perform a predetermined work.

  In order to achieve the above object, the present invention pays attention to the above-mentioned prior art documents using the belt ON signal wearing the seat belt, and on the contrary, the belt in which the seat belt is detached. It is characterized in that it is possible to work by assuming that the vehicle is in a stopped state (work preparation completion state) using an OFF signal.

  Specifically, the present invention is directed to a vehicle equipped with a work device that performs a predetermined work in a stopped state, and has taken the following solution.

That is, the present invention includes a drive circuit for driving and controlling the work device, and the drive circuit includes a switch ON signal for turning on the main power switch for the work device and a belt OFF signal for removing the seat belt of the driver's seat. by There were Do allow driving of the working device by closing to allow conduction is regarded as the stop state only when it is entered, to open so as to disable the passage of current in other cases The operation device is configured to be controlled to be opened and closed by a control unit so that the operation device cannot be driven .

  According to the present invention, when a belt OFF signal indicating that the seat belt of the driver's seat has been removed is input in a state where the switch ON signal for turning on the main power switch is input, the vehicle is stopped (work ready state). Therefore, the work device can be driven by closing the drive circuit by the control means, and a predetermined work can be performed in a stopped state. On the other hand, in other cases, for example, when a belt ON signal on which the seat belt of the driver's seat is attached is input in a state in which a switch ON signal to which the main power switch is turned on is input, Therefore, by opening the drive circuit by the control means, the work device does not move and safety during traveling can be ensured. Moreover, because the seat belt ON / OFF signal is used to determine whether or not the vehicle is stopped for work, a shift position signal and side brake signal from the engine periphery that may have a significant impact on driving. It is possible to prevent the engine control circuit and the like from being hindered as compared with the case of taking out.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 3 shows a cargo handling vehicle C as a vehicle according to the embodiment of the present invention. The cargo handling vehicle C includes a cab 1 on the front end side of the vehicle body and a chassis 2 behind the cab 1, and a cargo handling apparatus 3 as a working device is mounted on the chassis 2. The cargo handling device 3 is for pulling up the container 4 to the chassis 2 and loading a load (not shown) while the vehicle is stopped, and for unloading the container 4 together with the load from the chassis 2 while the vehicle is stopped. A substantially L-shaped undulation arm 6 is provided. The base end of the hoisting arm 6 is supported so as to be pivotable in the vertical direction by the support shaft 7 in the middle of the vehicle body 2 in the longitudinal direction of the vehicle body and in the middle of the vehicle width direction. At the vehicle body front end of the chassis 2 and in the middle of the vehicle width direction, the base end of the cylinder body 9a of the hoisting cylinder 8 comprising a hydraulic cylinder that constitutes the cargo handling device 3 with the hoisting arm 6 swings up and down on the shaft 10. A tip of a piston rod 9b that is movably attached and protrudes rearward from the cylinder body 9a is connected to the base end of the hoisting arm 6 by a shaft 11. Further, guide rollers 12 are rotatably attached by shafts 13 at the vehicle body rear end of the chassis 2 and at both ends in the vehicle width direction.

  On the other hand, a rectangular vertical plate 15 is erected at the front end of the vehicle body of the container 4. In the middle of the outer surface of the vertical plate 15, the hook 5 at the tip of the hoisting arm 6 is hooked from below. A hooking portion 16 made of a bar material is provided. Further, one leg portion 17 is suspended from the front end of the vehicle body on the back surface of the container 4 and at both ends in the vehicle width direction. Also, casters 18 for smoothly performing the lifting / unloading operation (loading / unloading operation) of the container 4 are attached to the rear end of the vehicle body on the rear surface of the container 4 and both ends in the vehicle width direction.

  In order to unload the container 4 from the cargo handling vehicle C configured in this way, when the cargo handling vehicle C loaded with a load arrives at the destination, the hoisting cylinder 8 is extended in the parked state and the hoisting arm 6 is raised from the lying posture. As a result, the container 4 is lowered from the chassis 2 and grounded while being guided by the guide roller 12. At this time, the caster 18 on the back surface of the container 4 rolls on the ground, so that the container 4 can be grounded smoothly. On the other hand, in order to pull up the container 4 to the cargo handling vehicle C, the cargo handling vehicle C is put in the back operation in front of the container 4 in which the cargo is accommodated, and the hoisting cylinder 6 is contracted to operate the hoisting arm 6 from the standing posture in the stopped state. The container 4 is caused to fall down, whereby the container 4 is pulled up to the chassis 2 while being guided by the casters 18 and the guide rollers 12, and the cargo handling vehicle C is driven and transported to the destination.

  The hoisting cylinder 8 of the cargo handling device 3 is connected to a drive circuit 19, and the drive circuit 19 drives and controls the cargo handling device 3 via an electric motor 23 (see FIG. 1) that generates hydraulic pressure electrically as the drive device. The hoisting cylinder 8 is extended and contracted. As shown in FIG. 1, the drive circuit 19 is provided with an electromagnetic relay 20 as a control means. The electromagnetic relay 20 is a belt on which a seat belt 21 in a driver seat in the cab 1 is mounted. A circuit for transmitting a signal and a belt OFF signal from which the seat belt 21 is disconnected is connected to a work apparatus main power switch (hereinafter referred to as a main switch) 22.

  As a feature of the present invention, the drive circuit 19 excites the electromagnetic relay 20 only when a switch ON signal for turning on the main switch 22 and a belt OFF signal for removing the seat belt 21 of the driver's seat are input. It is configured to be opened and closed so that it can be energized, and in other cases it is opened so that it cannot be energized by demagnetization of the electromagnetic relay 20. That is, when the switch ON signal including the main switch 22 is input and the belt OFF signal indicating that the driver's seat belt 21 is removed is input, the driver stops the cargo handling vehicle C. In this case, the drive circuit 19 is closed to allow energization so that the hoisting cylinder 8 can be expanded and contracted. In other cases, for example, when the switch ON signal of the main switch 22 and the belt ON signal of the seat belt 21 are input, the driver is in the driver's seat and is not yet ready to work. In this case, the drive circuit 19 is opened so as not to be energized so that the hoisting cylinder 8 cannot be expanded and contracted, so that the hoisting arm 6 does not move during traveling. When the switch OFF signal of the main switch 22 and the belt OFF signal of the seat belt 21 are input, it is considered that the driver is not in the driver's seat, and in this case, it is not necessary to extend and retract the hoisting cylinder 8. Therefore, the drive circuit 19 is opened so that it cannot be energized. Further, when the switch OFF signal of the main switch 22 and the belt ON signal of the seat belt 21 are input, it is assumed that the driver is in the driver's seat and is wearing the seat belt 21 and driving the cargo handling vehicle C. In this case as well, since it is not necessary to extend and retract the hoisting cylinder 8, the drive circuit 19 is opened so that it cannot be energized. The driver performs these ON / OFF switching operations in the cab 1.

  Next, the control of the cargo handling device 3 will be described based on the control flowchart of FIG.

  First, in step S1, it is determined whether or not the main switch 22 is turned on. If the determination is YES, the process proceeds to step S2, and it is determined whether or not the seat belt 21 is worn. If the determination here is NO, it is considered that the driver is ready to work, and the process proceeds to step S3 where the electromagnetic relay 20 is excited and the drive circuit 19 is energized. . Next, in step S4, it is determined whether or not the operation switch of the hoisting cylinder 8 is turned on. If the determination is YES, the electric motor 23 is started in step S5, and the hoisting cylinder 8 is expanded and contracted in step S6. . By the expansion and contraction operation of the hoisting cylinder 8, the container 4 is lifted and lowered with respect to the chassis 2.

  As described above, when the belt OFF signal indicating that the seat belt 21 of the driver's seat is removed is input in the state where the switch ON signal including the main switch 22 is input, the driver stops the cargo handling vehicle C. It is assumed that the preparation for performing the predetermined work is completed, and the drive circuit 19 is closed by the excitation of the electromagnetic relay 20, so that the hoisting cylinder 8 can be expanded and contracted, and the lifting and lowering work is performed in the stopped state. It can be performed. On the other hand, in other cases, for example, when a belt ON signal on which the seat belt 21 of the driver's seat is attached is input in a state where a switch ON signal including the main switch 22 is input, driving is performed. The undulation cylinder 8 does not expand and contract by opening the drive circuit 19 by demagnetization of the electromagnetic relay 20, and thus the undulation arm 6 moves. Therefore, safety can be ensured. Moreover, since it is determined whether or not preparations for work are completed based on the ON / OFF signal of the seat belt 21, a shift position signal and a side signal from the engine peripheral portion that may have an important influence on traveling are determined. As compared with the case where the brake signal is taken out, the engine control circuit or the like can be prevented from being hindered.

  In this embodiment, the control means is the electromagnetic relay 20, but other means may be employed as long as the drive circuit 19 can be controlled to open and close. Moreover, although the electric motor 23 was illustrated as a drive device, if it drives the hoisting cylinder 8, it will not restrict to this.

  The present invention can be applied to a vehicle equipped with a work device that performs a predetermined work in a stopped state, for example, a cargo handling vehicle, a garbage collection vehicle, a dump truck, an aerial work vehicle, and the like on which a container is detachably mounted.

It is a control block diagram of a material handling apparatus. It is a control flowchart of a cargo handling apparatus. It is a block diagram of a cargo handling vehicle.

Explanation of symbols

3 cargo handling equipment (working equipment)
19 Drive circuit 20 Electromagnetic relay (control means)
21 Seat belt 22 Main switch (Main power switch for work equipment)
23 Electric motor (drive device)
C Cargo handling vehicle

Claims (1)

A vehicle equipped with a work device (3) for performing a predetermined work in a stopped state,
A drive circuit (19) for driving and controlling the work device (3) ;
This drive circuit (19) is in a stopped state only when a switch ON signal for turning on the main power switch (22) for the working device and a belt OFF signal for removing the seat belt (21) of the driver's seat are input. the working device by closing to allow conduction is regarded as being possible to drive the (3) and Do, the working device by opening as a non energized otherwise (3) A vehicle equipped with a work device (3) that is configured to be controlled to be opened and closed by a control means (20) so as to disable driving of the vehicle.

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