JP2004001938A - Forklift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a space for disposing an indication plate of a lift-load curve. <P>SOLUTION: Data of the lift-load curve are previously memorized in a memory part 37. It is judged whether or not an operation of a lift lever and a tilt lever exists by taking-in an output of the lift lever sensor 39 and the tilt lever sensor 41 by a control part 29. When it is judged that the operation exists, the data of the lift-load curve are read out from the memory part 37 and controlling LCD27 to indicate the lift-load curve on the LCD27 instead of an information of a vehicle indicated until now. If so, the space for disposing the indication plate of the lift-load curve as conventional can be reduced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forklift information display device including means for displaying a lift load curve representing a relationship between a load center for each maximum lift of a forklift and an allowable load.
[0002]
[Prior art]
Conventionally, taking a counterbalance type forklift as an example, as shown in FIG. 5, a seat 105 is provided in a driver seat 103 of a vehicle body 101, and a battery (not shown) is mounted and accommodated below the seat 105. When a key switch (not shown) for starting a forklift is turned on, power is supplied from a battery to a traveling motor constituting a traveling system and a hydraulic motor constituting a hydraulic system (both motors are not shown). I have.
[0003]
When the accelerator pedal is depressed, the traveling motor is driven based on an output command value from a control device including a microcomputer or the like and transmitted to the front wheels that are the driving wheels, and the front wheel set by the operation of the directional lever 107 is set. The vehicle body 101 travels in the direction or the rear direction, and the rear wheels, which are the steered wheels, are steered according to the operation of the steering handle 109.
[0004]
Further, as shown in FIG. 5, a mast 111 is attached to the front part of the vehicle body 101 so as to be extendable and contractable, and a pair of L-shaped forks 115 is attached to the mast 111 via a lift bracket 113. The hydraulic motor is driven in response to the operation of the hydraulic lever 117 provided in the driver's seat 103 to operate the lift cylinder, the mast 111 expands and contracts, the fork 115 moves up and down, the tilt cylinder operates and the mast 111 tilts (Tilt) and the fork 115 tilts together with the mast 111.
[0005]
By the way, in a forklift including such a counterbalance type forklift, for example, a lift load curve representing a relationship between a load center at each maximum lift and an allowable load as shown in FIG. 6 is generally displayed. Conventionally, a graph representing a lift load curve is engraved on a display plate made of metal such as aluminum. In a counterbalance type forklift, such a display plate 119 is attached to the seat 105 of the vehicle body 101 as shown in FIG. Is stuck to the side.
[0006]
[Problems to be solved by the invention]
However, in the conventional case, the display plate 119 showing the lift load curve is prepared as described above, and these are fixed to the vehicle body 101. Therefore, a space for disposing the display plate 119 is secured in any part of the vehicle body 101. There was a problem that had to be done.
[0007]
In addition, in the case of a forklift to which attachments such as a rotating roll clamp, a load stabilizer and a push-pull can be attached in addition to the fork 115, it is necessary to display a lifting load curve for each attachment. There is also a problem that a lot of space must be secured to arrange a plurality of display plates 119 showing a high load curve.
[0008]
Then, an object of the present invention is to be able to reduce the arrangement space of the display plate of the lifting load curve.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is characterized in that a lift load curve is displayed on the display unit in a forklift including a display unit for displaying vehicle information (claim 1).
[0010]
According to such a configuration, since the lift load curve is displayed on the display unit that displays the vehicle information, the operator only needs to look at the lift load curve displayed on the display unit. A plate representing a load curve is not required, and the space for disposing such a plate can be reduced.
[0011]
Further, the present invention is characterized in that, when it is detected that the cargo handling operation has been performed, the display content of the display unit switches from the display of the vehicle information to the display of the lifting load curve (claim 2). ).
[0012]
According to such a configuration, when there is a cargo handling operation, the display content of the display unit is switched from the display of the vehicle information to the display of the lifting load curve. Therefore, when the cargo handling lever is not operated, the lifting unit is displayed on the display unit. The load curve is not displayed, and unnecessary display can be eliminated.
[0013]
Further, in the present invention, the forklift changes an attachment according to a form of a load, and stores a plurality of lifting load curves corresponding to various types of the attachments in a storage unit, and uses the attachment to be used actually. The lift load curve corresponding to the above is selectively displayed on the display section (claim 3).
[0014]
According to such a configuration, when an attachment other than the fork is mounted, not only can the space for disposing a plurality of display plates be removed as in the related art, but also the lifting load on the actually used attachment can be eliminated. The curve can be displayed on the display unit when necessary.
[0015]
Further, according to the present invention, there is provided a lift detecting sensor for detecting a lift of the fork, and a load sensor for detecting a load applied to the fork, wherein the lift load curve is displayed on the lift load curve displayed on the display section. The present invention is characterized in that a load point corresponding to the current lift by the high detection sensor and the current load by the load sensor is displayed (claim 4).
[0016]
According to such a configuration, the load point corresponding to the current lift by the lift sensor and the current load by the load sensor is displayed on the displayed lift load curve, so that the worker can view the current lift point. The load situation can be easily grasped.
[0017]
Further, the present invention is characterized in that an alarm device that sounds when the load point displayed on the display section is out of the safety area is provided (claim 5).
[0018]
According to such a configuration, the worker can recognize from the warning by the warning unit that the current load situation is out of the safety region, and can take a quick countermeasure.
[0019]
Further, the present invention is characterized in that the display content of the display section can be selected from either the vehicle information or the lifting load curve by a changeover switch provided in a driver's seat (claim 6). ).
[0020]
According to such a configuration, since either the vehicle information or the lift load curve is selectively displayed on the display unit by operating the changeover switch, the operator can select a desired one of the vehicle information and the lift load curve. Things can be displayed.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment in which the present invention is applied to a counterbalance type forklift will be described with reference to FIGS. 1 is a perspective view of a counterbalance type forklift, FIG. 2 is a right side view, FIG. 3 is a partial perspective view thereof, and FIG. 4 is a block diagram of a control device.
[0022]
The counterbalance type forklift according to the present embodiment is configured, for example, as shown in FIGS. That is, a battery (not shown) is mounted and accommodated below a seat 5 provided in the driver's seat 3 of the vehicle body 1, and a driving system is configured by turning on a key switch (not shown) for starting a forklift. Power is supplied from a battery to a traveling motor and a hydraulic motor (not shown) constituting a hydraulic system.
[0023]
When the accelerator pedal 7 is depressed, the traveling motor is driven based on an output command value from a control device such as a microcomputer, which will be described later, and the vehicle moves in the forward or rearward direction set by operating the directional lever 9. 1 runs. At this time, the steering wheel 10 controls the steering of the rear wheels 11 as the steered wheels, and the depressing operation of the brake pedal 13 applies a braking force to the front wheels 15 as the drive wheels.
[0024]
Further, as shown in FIGS. 1 to 3, a mast 17 is attached to the front part of the vehicle body 1 so as to be extendable and contractable, and a pair of L-shaped forks 21 is attached to the mast 17 via a lift bracket 19. . Then, a hydraulic motor is driven based on a control command value according to an operation of a lift lever 23 which is a cargo handling lever provided in the driver's seat 3, the lift cylinder is operated, and the mast 17 expands and contracts. The fork 21 moves up and down. The driver's seat 3 is provided with a tilt lever 25 as a cargo handling lever in addition to the lift lever 23. The tilt cylinder operates by operating the tilt lever 25, and the mast 17 is tilted (tilted) and the fork 21 is tilted. Tilts with the mast 17.
[0025]
1 and 3, a liquid crystal display (hereinafter, referred to as an LCD) 27 as a display unit is provided near the steering wheel 10 of the driver's seat 3, and is controlled by a control device. In addition to vehicle information on traveling and cargo handling such as traveling speed, load of luggage, remaining capacity of the driving battery, etc., as described later, lift indicating the relationship between the load center for each maximum lift of the forklift and the allowable load Display high load curve.
[0026]
By the way, a control device for controlling the components and the LCD 27 is configured as shown in FIG. That is, as shown in FIG. 4, a control unit 29 composed of a microcomputer is provided. The control unit 29 controls the speed sensor 31 as a vehicle condition detection sensor for detecting the traveling speed, and the load sensor 33 for detecting the load of the load. The outputs of various sensors such as a height sensor 35 for detecting the height of the fork 21 are taken in, the remaining capacity of the battery mounted on the vehicle body 1 is detected, and the LCD 27 is controlled to control vehicle information relating to traveling and cargo handling. Is displayed on the LCD 27.
[0027]
Further, as shown in FIG. 4, a storage unit 37 composed of, for example, a rewritable ROM is provided, and the storage unit 37 stores data of a lifting load curve in advance. The output of a lift lever sensor 39 and a tilt lever sensor 41 as a loading / unloading lever detecting means including limit switches which are operated by operating the lift lever 23 and the tilt lever 25, respectively, is taken in by the control unit 29, and the lift lever 23 and the tilt It is determined whether or not the lever 25 has been operated. If it is determined that the operation has been performed, the data of the lifting load curve is read out from the storage unit 37, and the LCD 27 is controlled to display the vehicle information that has been displayed until then. Instead, a lifting load curve is displayed on the LCD 27.
[0028]
At this time, based on the outputs of the load sensor 33 and the height sensor 35, the control unit 29 corresponds to the current height of the lift sensor 35 and the current load of the load sensor 33 in the displayed height load curve. The points are superimposed and displayed.
[0029]
The control unit 29 determines whether the point superimposed on the lift load curve of the LCD 27 is within the safety region of the load balance, and when determining that the point is out of the safety region, the control unit 29 functions as an alarm unit. The drive control of the buzzer 43 generates an alarm sound.
[0030]
When the lift lever 23 and the tilt lever 25 are not operated, the control unit 29 controls the LCD 27 to display vehicle information based on the outputs of the speed sensor 31, the load sensor 33, and the height sensor 35. Vehicle information such as speed and remaining battery power is displayed.
[0031]
On the other hand, when the lift lever 23 or the tilt lever 25 is operated, the operation of the lift lever 23 or the tilt lever 25 is detected based on the output of the lift lever sensor 39 or the tilt lever sensor 41, and the control unit 29 stores the data in the storage unit. The data of the lifting load curve is read from 37, and the lifting load curve based on this data is displayed on the LCD 27 instead of the vehicle information.
[0032]
Therefore, according to the above-described embodiment, the operator only needs to look at the lift load curve displayed on the LCD 27, and a plate representing the lift load curve as in the related art is unnecessary, and the arrangement space of such a plate is reduced. can do.
[0033]
When the lift lever 23 and the tilt lever 25 are operated, the operation of the lift lever 23 and the tilt lever 25 is detected by the lift lever sensor 39 and the tilt lever sensor 41, and the control unit 29 changes the display from the display of the vehicle information to the height. Since the LCD 27 is switched to display the load curve, the lift load curve is not displayed on the LCD 27 when the lift lever 23 and the tilt lever 25 are not operated, and unnecessary display can be eliminated.
[0034]
Further, since the points corresponding to the current height by the height sensor 35 and the current load by the load sensor 33 are displayed on the displayed height load curve, the operator can easily determine the current load status. I can figure it out. At this time, if an alarm sound is emitted by the alarm buzzer 43, the operator can easily grasp that the current load situation is out of the safety area, and can take quick measures.
[0035]
At this time, in the above-described embodiment, a point corresponding to the current lift by the lift sensor 35 and the current load by the load sensor 33 is displayed on the displayed lift load curve. Such a display is not necessarily performed.
[0036]
As another embodiment of the present invention, an operation switch as an operation unit is provided in the driver's seat 3, and the operator operates this operation switch to change the display content of the LCD 27 to either vehicle information or a lifting load curve. When the display is switched to the display of the lifting load curve by the operation of the operation switch, the control unit 29 controls the detection of the operation of the lift lever 23 or the tilt lever 25 by the lift lever sensor 39 or the tilt lever sensor 41. Alternatively, the LCD 27 may be controlled to display a lifting load curve.
[0037]
With this configuration, based on the operation of the operation switch by the operator, the display unit is controlled by the control unit 29, and the display content is switched to either the vehicle information or the lifting load curve. Alternatively, a desired one of the lifting load curves can be displayed on the LCD 27 and viewed.
[0038]
At this time, when the display is switched to the display of the lifting load curve by the operation of the operation switch, regardless of the detection of the lift lever 23 or the tilt lever 25 by the lift lever sensor 39 or the tilt lever sensor 41, the control of the control unit 29 is performed. Since the lift load curve is displayed on the display unit, the operator can check the lift load curve at any time.
[0039]
Further, when the forklift is of a type to which a plurality of types of attachments can be attached, the data of the lifting load curve for each attachment is stored in the storage unit 37 and provided as the above-described operation switch or another operation unit. By operating the selection switch, it is possible to select desired lift load curve data from a plurality of types of lift load curve data stored in the storage unit 37 when switching to display of the lift load curve. I do not care.
[0040]
By doing so, the operator can operate the operation switch to select a desired one from the data of the plurality of lifting load curves stored in the storage unit 37 and display it on the LCD 27, as in the related art. Not only can the space for disposing a plurality of display plates be removed, but also the lifting load curve for a predetermined attachment can be displayed on the LCD 27 when necessary.
[0041]
Further, in the above-described embodiment, the case where the alarm buzzer is used as the alarm unit has been described. However, the invention is not limited to the buzzer, and other means such as an alarm lamp may be used. May be displayed.
[0042]
Further, in the above-described embodiment, the case where the present invention is applied to the counterbalance type forklift is described. However, the present invention can be applied to reach type forklifts other than the counterbalance type and other types of forklifts. Needless to say, in this case, the same effect as in the above-described embodiment can be obtained.
[0043]
Further, the present invention is not limited to the above-described embodiment, and various changes other than those described above can be made without departing from the gist of the present invention.
[0044]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the lift load curve is displayed on the display unit that displays vehicle information, the operator can see the lift load curve displayed on the display unit. It is often unnecessary to provide a plate representing a lift load curve as in the prior art, and it is possible to reduce the arrangement space for such a plate.
[0045]
According to the second aspect of the present invention, when there is a cargo handling operation, the display content of the display unit switches from the display of the vehicle information to the display of the lifting load curve. Therefore, when the cargo handling lever is not operated, The lift load curve is not displayed on the display, and unnecessary display can be eliminated.
[0046]
According to the third aspect of the present invention, when an attachment other than a fork is mounted, the arrangement space for a plurality of display plates can be deleted as in the related art, and the display plate is actually used. The lifting load curve for the attachment can be displayed on the display unit when necessary.
[0047]
According to the invention described in claim 4, since the current lift by the lift sensor and the load point corresponding to the current load by the load sensor are displayed on the lift load curve being displayed, The operator can easily grasp the current load condition.
[0048]
Further, according to the invention described in claim 5, from the warning by the warning unit, the worker can recognize that the current load situation is out of the safety area, and can take quick measures. Will be possible.
[0049]
According to the invention described in claim 6, either the vehicle information or the lift load curve is selectively displayed on the display unit by operating the changeover switch. A desired curve can be displayed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a counterbalanced forklift according to an embodiment of the present invention.
FIG. 2 is a right side view of the counterbalanced forklift according to the embodiment of the present invention.
FIG. 3 is a perspective view of a part of the counterbalance type forklift according to the embodiment of the present invention.
FIG. 4 is a block diagram according to an embodiment of the present invention.
FIG. 5 is a plan view of a counterbalanced forklift serving as a background of the present invention.
FIG. 6 is a diagram showing a lifting load curve as a background of the present invention.
[Explanation of symbols]
1 vehicle body 21 fork 23 lift lever (loading lever)
25 Tilt lever (loading lever)
27 LCD (display unit)
29 control unit 31 speed sensor (vehicle condition detection sensor)
33 Load sensor 35 Lift sensor 37 Storage unit 39 Lift lever sensor (load handling lever detecting means)
41 Tilt lever sensor (loading lever detecting means)
43 Alarm buzzer (alarm unit)

Claims (6)

In a forklift equipped with a display unit for displaying vehicle information,
A forklift, wherein a lift load curve is displayed on the display unit. 2. The forklift according to claim 1, wherein upon detecting that a cargo handling operation has been performed, the display content of the display unit switches from displaying the vehicle information to displaying the lifting load curve. 3. The forklift changes the attachment according to the form of the load,
A plurality of lifting load curves corresponding to the various attachments are stored in a storage unit, and the lifting load curve corresponding to the actually used attachment is selectively displayed on the display unit. Item 3. The forklift according to item 1 or 2. A lift detection sensor that detects the lift of the fork, and a load sensor that detects a load applied to the fork,
A load point corresponding to a current lift by the lift detection sensor and a current load by the load sensor is displayed on the lift load curve displayed on the display unit. The forklift according to any one of 1 to 3, above. The forklift according to claim 4, further comprising an alarm that sounds when the load point displayed on the display unit is out of a safety area. The forklift according to claim 1 or 2, wherein the display content of the display unit can be selected from the vehicle information and the lift load curve by a changeover switch provided in a driver's seat.

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