JPH05286700A - Display device of fork lift cab - Google Patents

Abstract

PURPOSE:To allow momentarily acquiring the desired information precisely by using one display panel which is changed over from the running/loading display mode to the charging display mode and vice versa, and displaying the relevant information required in each display mode. CONSTITUTION:A display device 200 installed in the cab of a fork lift is composed of a display panel 200A and the first and second setting panels 200B, 200C positioned on the two sides of the panel 200A, and therewith the displaying contents are changed over depending upon if the displaying takes place in the running/loading display mode or the charging display mode. This changing-over is made interlocked with a key switch being put on and off. When the key switch is on, the running/loading display mode is selected, in which for example the battery voltage in V, running speed in km/h, loading weight in ton, etc., are given on the main data display part 20 l - when the key switch is off, the 'being charged' mark 212B is given in the display panel 200A while the battery voltage in V given on the main data display part 201.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-operated forklift cab display device.

[0002]

2. Description of the Related Art FIG. 14 shows an example of a display device provided in a conventional battery type forklift driver's cab.

In the figure, reference numeral 60 denotes a panel surface of the display device. 61 is a data display (main display), 62
Numerals to 65 are current display content type lamp LEDs of the data display (main display portion) 61, and the lighting of the lamp 62 indicates that the voltage value E of the battery is displayed.
Indicates that the monitor code is displayed, that the lamp 64 lights up indicates that the battery charging time T is displayed, and that the lamp 65 lights up indicates that the value of the battery charging current A is displayed. Reference numeral 66 denotes a switch for switching the display content of the data display 1 (switching the lamps 62 to 65). 67 is a lamp that lights up while the battery is being charged, 68
Is a lamp for notifying the end of charging of the battery, and 69 and 70 are lit to indicate the type of charging method "normal charging"
It is a lamp that tells whether it is "charging" or "uniform charging". L _{10 to} L ₆₀ are battery remaining amount display lamps.

Reference numerals 71 and 72 are push button switches for instructing a battery charging mode, and 73 is a push button switch for setting a reserved battery charging time. Monitor codes 74 to 77 are lit by a flicker when a corresponding abnormality occurs.

[0005]

This display device displays the specifications and status of the battery and the cause of the abnormality by means of a lamp display. If the operability and safety of the battery-powered forklift are improved to increase the added value, the number of specifications and states to be displayed will increase dramatically.
The above lamp display has a problem that the display becomes complicated and difficult to see.

The present invention has been made to solve this problem, and an object of the present invention is to provide a display device for a forklift cab capable of displaying a large amount of information on one display surface.

[0007]

In order to achieve the above object, the present invention provides a display panel portion of a display device provided in a driver's cab, which can be switched to a traveling / cargo display mode / charge display mode. It has a certain configuration.

In claim 2, the switching between the traveling / cargo handling display mode / charging display mode is automatically performed by turning on / off the key switch.

According to a third aspect of the present invention, the display panel section of the display device is a mode for displaying a specification display section for numerical display, a status display section for increasing or decreasing the display area, an abnormal display section for mark display, and a charge / charge reservation mode type. It is configured to have a display portion.

According to a fourth aspect of the present invention, the specification display unit for displaying numerical values is configured to perform display operation both in the traveling / cargo handling display mode and the charge display mode.

According to the present invention, the battery status display section of the status display sections whose display area is increased or decreased is configured to perform the display operation in both the traveling / cargo display mode and the charge display mode.

According to a sixth aspect of the present invention, the display panel section has a fork horizontal attitude display section, and the fork horizontal attitude display section displays a mark when the fork horizontal attitude is displayed.

According to a seventh aspect, the display panel section is a liquid crystal panel.

According to the present invention, the display device has a setting panel section, and the setting panel section has a changeover switch for switching the display contents of the specification display section for numerical display.

According to a ninth aspect of the present invention, the setting panel section has a set button switch for setting one or more fork lift stop positions, and the display panel section displays each of the one or more fork lift stop positions. It is configured to have a display unit that operates.

According to a tenth aspect, the setting panel section is provided with a charge reservation time setting push button switch.

[0017]

In the present invention, the display panel section of the display device is changed to the traveling / cargo display mode by turning the key switch on / off.
Switch to charging display mode.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the display screen of the display device 200 (in this example, the display screen of the liquid crystal panel), and FIG. 1 shows the display pattern in the traveling / loading mode,
FIG. 2 shows a display pattern in the charging mode.

200A is a display panel section (liquid crystal panel),
Reference numeral 200B is a first setting panel section, and 200C is a second setting panel section. Reference numeral 201 of the display panel unit 200A is a main data display unit for switching and displaying the battery voltage V, the traveling speed Km / h, the cargo handling weight ton and the like (in the traveling mode). A sub data display unit 202 is located below the main data display unit 201 and displays the traveling distance, the total time, the traveling time, the hydraulic pressure time (the time when the cargo handling motor is operating), etc. in the traveling / loading mode. Switch display. Reference numeral 203 is an acceleration display unit, 204 is a power display unit, 205 is an economy display unit, 206 is a fork flat display unit, and 207 is a battery remaining amount display unit. 208
Is a parking mark display portion, 209 is a brake fluid shortage mark display portion, 210 is a battery fluid shortage mark display portion, 2
Reference numeral 11 is a fuse cut mark display portion, 211A is a fuse cut mark of the cargo handling motor circuit, 211B is a fuse cut mark of the traveling motor circuit, and 211C is a fuse cut mark of the power steering circuit. 212A is a charging reservation display portion, 212B is a charging display portion, 213U, 213.
M and 213D are fork lift stop position display portions. Two
Reference numeral 14 is a display for canceling the setting of the fork lift stop position.

215U of the first setting panel section 200B,
215M, 215D are fork lift stop position setting display push button switches (set switches), 216 are main data display display content switching button switches, 217 are acceleration display button switches, 218 is a power / economy switching command button switch. is there.

Numeral 219 of the second setting panel section 200C is a button switch for changing the display contents of the sub data display,
Reference numeral 220 denotes a reserved charging setting unit, which is a push button switch 220A for setting a first charging time (for example, in units of 10 hours).
And a push button switch 220B for setting the second charging time (for example, in units of one hour).

FIG. 3 shows a schematic structure of a forklift in which the display device 200 is installed in a driver's cab.
FIG. 4 shows the entire forklift control device.

In FIG. 3, reference numeral 1 denotes a vehicle body of a forklift driven by a battery, 1A denotes wheels, and 2 denotes a mast supported by a tilt mechanism (not shown) having a tilt cylinder 4 (from an outer mast and an inner mast). It becomes).
Reference numeral 3 denotes a fork, which is supported by the mast 2 via an elevating mechanism (not shown) including a lift cylinder 5. The tilt cylinder 4 is connected to a hydraulic pump 8 via a forward tilting proportional valve 6A and a rearward tilting proportional valve 6B, and the lift cylinder 5 is connected to a hydraulic pump 8 via an ascending proportional valve 7A and a descending proportional valve 7B. Have been contacted. 9 is a hydraulic pump 8
Motor 10 is a hydraulic tank. Reference numeral 11 is a tilt lever, and 12 is a lift lever, both of which are arranged on a driver's cab (not shown).

Reference numeral 13B denotes a push button switch provided on the grip portion of the lift lever 12 for switching the lift operation automatic stop / release mode. As shown in an enlarged view in FIG. 5, the lift cylinder 5 is provided with a fork height sensor 14B, and the sensor body 15 is fixed to the lower end portion of the cylinder of the lift cylinder 5. The end of the wire 16 extending from the inside is connected to a connector 17 protruding from the rod end of the lift cylinder 5. The sensor main body 15 is a reel type sensor, and includes a reel around which the wire 16 is wound and a transducer for converting into a fork lift signal H which is a voltage signal proportional to the rotation amount of the reel.

Reference numeral 13A is a push button switch for switching the tilt operation automatic stop / release mode provided on the grip portion of the tilt lever 12. Further, the tilt cylinder 5 is provided with a tilt angle sensor 14A, as shown in an enlarged view in FIG. 6, and the tilt angle sensor 14A has a tilt angle (forward tilt angle, backward tilt angle) of the mast 2 and thus the fork 3. Detect θ.

In FIG. 4, reference numeral 100 denotes a control device, 101
Is a processing unit (CPU), 102 is a memory unit,
103 is an I / O device. Reference numeral 230 of the display device 200 is an I / O device, 231 is an arithmetic processing unit CPU, 232 is a memory unit, and 233 is a liquid crystal panel constituting the display panel unit 200A.

Reference numeral 11A is a lever operation detection switch built in the tilt cylinder 4, and 12A is a lever operation detection switch built in the tilt cylinder 4.
Reference numeral 21 is a variable resistor for converting the operation amount of the tilt lever 11 into a voltage signal (illustrated in FIG. 9), and 22 is the lift lever 1
8 is a variable resistor that converts the manipulated variable of 2 into a voltage signal (exemplified in FIG. 7). Reference numeral 23 denotes an A / D converter, which converts the voltage signal sent by the variable resistors 21 and 22, the output of the fork lift sensor 14B, and the tilt angle signal θ digital signal sent by the tilt angle sensor 14A into the control device. Input to the CPU 101.

Reference numeral 24 is a steering motor, 25 is a steering motor controller, 26 is a traveling motor, and 27 is a traveling motor.
Is a chopper element, 28 is a chopper control circuit, 29 is a hydraulic motor of a hydraulic pump, 30 is a chopper element, 31 is a chopper control circuit, and 32 is a battery. A valve control circuit 33 controls opening / closing and valve opening of the proportional valves 6A, 6B and 7A, 7B based on a valve control command input from the CPU 101. 34A is a steering circuit fuse, 34B is a traveling motor circuit fuse, 34C is a cargo handling motor circuit fuse, 35A is a steering circuit power switch, and 35B is a traveling motor circuit power switch.
35C is a power switch for the cargo handling motor circuit, 36A is a fuse blowout detection sensor for the steering circuit, 36B is a fuse blowout detection sensor for the traveling motor circuit, and 36C is a fuse blowout detection sensor for the cargo handling motor circuit. 37 is a pulse pickup connected to the traveling motor 26, 38 is a voltage detector of the battery 32, 39 is a battery fluid detector of the battery 32, 40 is a brake fluid detector, 41 is a parking brake interlocking switch, and 42 is a cargo handling motor. A brush wear detection sensor 43 is a travel motor brush wear detection sensor.

Reference numeral 45 is a battery charger, 46 is an operation panel of the battery charger 45, 47A is a "normal charge" command push button switch, 47B is an "equal charge" command push button switch, and 48 is a charging current detector.

Reference numeral 49 is a key switch, 50 is an accelerator, 5
1 is a buzzer.

[A] When the key switch 49 is turned on, the switch output is given to the CPU 101,
The display device 200 is notified from 101 by the traveling mode, the display device 200 can display the traveling / cargo handling display mode shown in FIG. 1, and the CPU 231 executes the traveling display program.

(1) When the button switch 216 for switching the display contents of the main data display is pressed, the CPU 231 which receives the switch output outputs the CPU 1 of the control device 100.
01 requesting the data of the battery voltage V, and the CPU
101 reads the detection value of the battery voltage detector 38 and returns it to the CPU 231, and the CPU 231 causes the main data display unit 201 to display the detected value as a numeral. Button switch 216 for switching main data display contents
When is pressed again, the CP that received the switch output
U231 requests the data of the traveling speed Km / h to the CPU 101 of the control device 100, the CPU 101 returns the value of the traveling speed Km / h to the CPU 231 based on the detection value of the pulse pickup 37, and the CPU 231 mainly outputs this value. The numbers are displayed on the data display unit 201. Button switch 216 for switching main data display contents
When is pressed again, the CP that received the switch output
U230 requests the data ton of the load applied to the fork 3 from the CPU 101 of the control device 100,
01 reads the detection value of the load detector 44 and the CPU 23
Then, the CPU 231 displays the detected value on the main data display unit 201 as a numeral. When the button switch 216 for changing the display content of the main data display is pressed again, the type of the abnormality that has occurred is displayed by the code number. The display cycle is repeated each time the button switch 216 for changing the display content of the main data display is pressed.

(2) Acceleration display button switch 217
When is pressed, the CPU 231 which receives the switch output requests data of the vehicle acceleration from the CPU 101 of the control device 100, and the CPU 101 calculates the acceleration based on the detection value of the pulse pickup 37 and returns it to the CPU 231. Causes the acceleration display unit 203 to display a bar mark. The number of the bar marks increases from the S side to the F side according to the magnitude of acceleration, and conversely decreases.

(3) The CPU 101 calculates the remaining battery amount based on the battery voltage V and transmits it to the CPU 231, and the display mark 207 displays this remaining battery amount as a bar mark. The number of this bar mark decreases as the remaining battery power decreases.

(4) The fork lift stop position setting push button switches 215U, 215M, 215D, the fork lift stop position display portions 213U, 213M, 213D and the release display portion 214 will be described later.

(5) The CPU 101 of the control device 100 monitors the output of the switch 41 interlocking with the parking brake, the outputs of the fuse blown sensors 26A to 36C, the output of the brake fluid detector 40, and the output of the battery fluid detector 39. Therefore, when the switch 41 is turned on and when the fuse blown sensors 26A to 36C output, the fact is indicated by CP.
U231 is notified, and when the outputs of the brake fluid detector 40 and the battery fluid detector 39 have decreased to the set values, the CPU 231 is notified. As a result, the CPU 231
Displays the parking mark on the parking mark display unit 208 and the mark 211 corresponding to the blown fuse display unit 211.
A to 211C are displayed, and a brake fluid shortage display mark 209 and a battery fluid shortage display mark 210 are displayed.

(6) The fork horizontal display section 206 will be described later.

(7) The CPU 101 of the control device 100 is requested for data of the total traveling distance of the vehicle, the CPU 101 calculates the total traveling distance of the vehicle, stores it in the memory unit 102 and transmits it to the CPU 231, and the CPU 231 This value is displayed numerically on the sub data display unit 202. When the button switch 219 for changing the display contents of the sub data display is pressed, C which receives the switch output
The PU 231 requests the travel time data from the CPU 101 of the control device 100, and the CPU 101 reads out the travel time accumulated in the memory unit 102 and stores it in the memory unit 102 to transmit it to the CPU 231.
The U231 displays this value on the sub data display unit 202 together with the mark a. When the button switch 219 for changing the display content of the sub data display is pressed again, the hydraulic pressure time is displayed on the sub data display unit 202 together with the mark b, and the button 218 for changing the display content of the sub data display is pressed again. Then, the total time is displayed on the sub data display unit 202 together with the mark c.

[B] When the key switch 49 is turned off, the switch output is given to the CPU 1016, the CPU 101 notifies the display device 200 of the charging mode, and the display device 200 is charged as shown in FIG. The display mode can be displayed, and the CPU 231 executes the charge display program.

(1) When the "normal charge" or "equal charge" push button 47A or 47B on the operation panel 46 of the charger 45 is pressed, the charging of the battery is started and the charging mark 212B is displayed on the display unit 200A. Is displayed, and the main data display unit 201 displays the battery voltage.

(2) When the reserved charging time is set by the first charging time setting push button switch 220A or / and the second charging time setting push button switch 220B, the set value is transmitted to the CPU 101, A reservation timer (not shown) of the CPU 101 is set to the set time, and the reserved mark 212A is displayed in a flicker. When the "normal charge" or "equal charge" push button on the operation panel 46 is pressed, the reserved mark 212A changes to a static display and the charging mark 212B is displayed, the reservation timer starts counting down, and the set time is set. When is elapsed, the charger 45 is instructed to start charging. The timer time of the reservation timer is displayed on the main data display unit 201 (flicker display until the "normal charge" or "equal charge" push button on the charging device panel is pressed).

(3) When the charging of the battery 32 is started, the CPU 101 inputs the output value of the charging current detector 44, calculates the battery charge amount and transmits it to the CPU 231.
The battery charge amount is displayed as a bar mark on the battery remaining amount display mark 207.

(4) When the battery voltage rises to the point of inversion, the CPU 101 sets a charge timer (not shown) and the charge timer starts counting down.
The sub data display unit 202 displays a numerical value for the timer value of the charging timer. It should be noted that the sub-data display unit 202 does not display until the battery voltage reaches the reversal point.
There is no display as shown in.

[C] Display Operation of Fork Horizontal Display Unit 206 First, the tilt operation of the fork 3 will be briefly described.

When the tilt lever 11 is tilted forward from the neutral position, the lever operation detection switch 11A built in the tilt lever 11 is turned on, and the variable resistor 21 has a size corresponding to the operation amount of the tilt lever 11. The voltage signal (FIG. 9) is output. This voltage signal rises from the voltage value of 1/2 of the power supply voltage V _C1 of the variable resistor 21. The value of this voltage signal (hereinafter referred to as the forward tilt signal) is converted into the A / D converter 23.
The CPU 101, which is input through the I / O unit 103, sends a motor speed command (shown in FIG. 10) corresponding to the value of the forward lean signal to the chopper control circuit 31 through the I / O unit 103, and the chopper control circuit 31 responds to the level of the motor speed command. The base signal of the pulse width is given to the base of the chopper element 30, and the valve control command according to the value of the forward tilt signal is given to the valve control circuit 33 through the I / O unit 103. The valve control circuit 33 amplifies this valve control command and gives it to the forward lean proportional valve 6A.
A opens the valve to the degree of valve opening corresponding to the magnitude of the valve control command. As a result, the pressure liquid flows into the tilt cylinder 4 in the direction in which the rod is pushed out, and the push-out of the rod causes the fork 3 to tilt forward.

When the tilt lever 11 is tilted backward from the neutral position, the variable resistor 21 outputs a voltage signal that decreases according to the operation amount of the tilt lever 11. This voltage signal decreases from the voltage value of 1/2 of the power supply voltage V _C1 of the variable resistor 21. The CPU 101, which has input the value of this voltage signal (hereinafter, referred to as the rearward tilt signal) through the A / D converter 23, outputs the motor speed command that increases in response to the decrease of the rearward tilt signal I
It is sent to the chopper control circuit 31 through the / O section 27, and the chopper control circuit 31 gives a base signal of a pulse width corresponding to the level of the motor speed command to the base of the chopper element 30. Further, a valve control command that increases in response to a decrease in the backward tilt signal is given to the valve control circuit 33 through the I / O unit 103. The valve control circuit 33 amplifies this valve control command and gives it to the backward tilt proportional valve 6B, and the backward tilt proportional valve 6B opens to a valve opening degree corresponding to the magnitude of the valve control command.

As a result, the pressure liquid flows into the tilt cylinder 4 in the direction in which the rod is retracted, and the fork 3 is tilted rearward as the rod is retracted.

Data of the tilt angle θ ₀ corresponding to the horizontal attitude of the fork 3 is previously stored in the memory unit 10 of the CPU 101.
Written in 2.

(1) Tilt operation When the tilt lever 11 is operated to the front while pressing the push button switch 13A for automatic stop / release mode switching, the forward tilt proportional valve 6A operates as described above to assume the backward tilt posture. When a certain fork 3 approaches a horizontal posture, the CPU 101, which has input the automatic stop mode signal output from the push-button switch 13A for tilt operation automatic stop / release mode switching, switches to the automatic stop mode, and the tilt horizontal display unit 206 is displayed. Send a flicker display command to blink. As a result, the tilt horizontal display unit 20
6 starts flicker lighting. The CPU 101 monitors the detection value θ of the tilt angle sensor 14A, and when the posture of the fork 3 becomes horizontal and the detection value θ coincides with the set tilt angle θ ₀ stored in the memory unit 102, the tilt is detected. At the same time as the operation stop command is transmitted, a still display command for causing the tilt horizontal display unit 206 to display still is transmitted. As a result, the motor speed command to the motor 29 and the valve control signal for the forward lean proportional valve 6A disappear, the motor 29 stops, and the forward lean proportional valve 6A closes to supply the pressure fluid to the tilt cylinder 4. When the fork 3 is stopped, the fork 3 automatically stops in the posture of the set tilt angle θ ₀ , that is, in the horizontal posture, and thereafter, the tilt horizontal display unit 206 switches to the still display.
This stationary display allows the driver to know that the fork 3 is in a horizontal posture and is stopped in that posture.

When the pressing of the push button switch 13A for switching the tilt operation automatic stop / release mode is stopped, the automatic stop mode is released and the fork 3 can be tilted forward and backward.

(2) When the tilt lever 11 is operated forward without pushing the push button switch 13A for tilt operation automatic stop / release mode switching, the tilt horizontal display section 2
06 is not displayed, and the CPU 101 does not send the tilt operation stop command even if the detected value θ of the tilt angle sensor 14A reaches the set tilt angle θ ₀ . In this case, CPU1
When 01 becomes θ = θ ₀ , a ringing command for ringing the buzzer 51 is generated, so that the driver can know that the fork 3 is in the horizontal posture.

[D] Fork lift stop position display portion 213
U, 213M, and 213D are fork lift stop positions H1 to H3 (exemplified in FIG. 11), which are unloading positions, in the lower stage 1,
It is displayed in the number of middle stages 2 and upper stages 3. Each display (Fig. 13)
Is composed of an arithmetic numeral light emitting portion A indicating the number of steps, a fork mark light emitting portion B, an arrow light emitting portion C indicating the arithmetic numeral light emitting portion A, and a frame light emitting portion D surrounding the entire light emitting portions A to C. Also, 214
Is a display unit for displaying cancellation of the automatic stop mode. Figure 1
The fork lift stop position setting pushbutton switches (set switches) 215U, 215M and 215D of 2 are shown in FIG.
A switch (set switch) for setting the positions H1, H2, and H3 shown in (1). When pressed, it outputs a setting signal and displays the arithmetic number A and the fork mark B indicating the number of steps. This set value is transmitted from the CPU 231 to the CPU 101 and stored in the memory unit 102.

First, the raising / lowering operation of the fork 3 will be briefly described.

When the lift lever 12 is tilted forward from the neutral position, the lever operation detection switch 12A built in the lift lever 12 is turned on. Variable resistor 22
Outputs a voltage signal (shown in FIG. 8) having a magnitude corresponding to the operation amount of the lift lever 12. This voltage signal rises from the voltage value of 1/2 of the power supply voltage V _C1 of the variable resistor 22. The CPU 102, which has input the value of this voltage signal (hereinafter referred to as the rising signal) through the A / D converter 23, issues the motor speed command (shown in FIG. 9) according to the value of the rising signal to the I / O unit 103.
To the chopper control circuit 31, and the chopper control circuit 31 gives a base signal of a pulse width corresponding to the level of the motor speed command to the base of the chopper element 30 and a valve control signal of a magnitude corresponding to the value of the rising signal. I / O
The valve control circuit 33 is supplied through the section. The valve control circuit 33 amplifies this valve control signal and gives it to the rising proportional valve 7A, and the rising proportional valve 7A opens to a valve opening degree corresponding to the magnitude of the valve control signal. As a result, the pressure liquid flows into the lift cylinder 5 in the direction of raising the rod, and the fork 3 rises as the rod rises.

When the lift lever 12 is returned to the neutral position, the voltage signal decreases to 0. Therefore, the motor speed command decreases and the average value of the voltage applied to the motor 29 decreases to 0, and the average of the valve control signals decreases. The value also decreases to 0, and finally the ascending proportional valve 7A is closed, the supply of the pressure liquid to the lift cylinder 5 is stopped, and the ascent of the fork 3 is stopped.

When the lift lever 12 is tilted backward from the neutral position, the variable resistor 22 causes the lift lever 12 to move.
It outputs a voltage signal that decreases according to the manipulated variable of. This voltage signal decreases from the voltage value of 1/2 of the power supply voltage V _C1 of the variable resistor 22. The CPU 1 which has input the value of this voltage signal (hereinafter referred to as the falling signal) through the A / D converter 23
01 sends a motor speed command whose level rises with the decrease of the descending signal to the chopper control circuit 31 through the I / O section, and the chopper control circuit 31 outputs a base signal having a pulse width corresponding to the level of the motor speed command to the chopper element. A valve control signal which is given to the base of 30 and whose level rises with the decrease of the falling signal is given to the valve control circuit 33 through the I / O section. The valve control circuit 33 amplifies this valve control signal and supplies it to the downward proportional valve 7B, and the downward proportional valve 7B opens to a valve opening degree corresponding to the magnitude of the valve control signal. As a result, the pressure liquid flows into the lift cylinder 5 in the direction of lowering the rod, and the fork 3 descends as the rod descends.

(1) Setting of Lifting Stop Position The lift lever 12 is tilted forward to raise the fork 3, and the fork 3 moves to the fork lifting stop position H shown in FIG.
When it has risen to 2, the rise of the fork 3 is stopped and the setting display button switch 215M is pressed. The switch output from the setting display button switch 215M is the CPU 101.
The fork lift stop position H2 is written in a predetermined area of the memory unit 102, and the fork lift stop position H2 is set. Then, the numerical numeral light emitting portion A and the fork mark light emitting portion B of the display portion 213M are lit stationary to indicate that the fork lift stop position H2 is set. When the above setting is completed, the display of the frame light emitting portion D of the setting display button switch 213M disappears as shown in FIG.

(2) Manual stop mode (automatic stop release mode) After performing this setting, without pushing the lift automatic stop / release mode changeover push button switch 13A,
When the lift lever 12 is tilted forward to raise the fork 3, the CPU 101 sends a ringing command to the buzzer 51 to ring the buzzer 51 when the fork 3 rises to the fork lift stop position H2. Since the rising stop command for stopping the supply of the pressurized liquid to 7A is not sent, the fork 3 moves up until the driver operates the lift lever 12 to stop. In this automatic stop release mode, the "release" mark 214 is displayed (Fig. 13).

(3) Automatic stop mode After setting the above (1), the push button switch 13B for changing the lift automatic stop / release mode is pressed,
When the fork 3 is lifted by operating the lift lever 12 forward, the CPU 101, which receives the automatic stop mode signal output from the lift automatic stop / release mode switching pushbutton switch 13B, inputs the lift signal. Under this condition, the mode is switched to the automatic lifting height stop mode, and a flicker display command for blinking the lifting height stop position display portion 213M is sent. As a result, as shown in FIG. 13, the arrow light emitting portion C and the frame light emitting portion D of the lift stop position display portion 213M start the flicker display. CPU 101 is a fork lift sensor 14
The detection value of B is monitored, and if the fork 3 moves up and this detection value matches the value of the fork lift stop position H2 stored in the memory unit 102, the fork lift stop command is sent and lifted at the same time. High stop position display 213M
Send a static display command to static display. As a result, the motor speed command and the valve control signal to the cargo handling motor 29 disappear, the motor 29 stops, and the rising proportional valve 7A
Is closed and the supply of the pressurized liquid to the lift cylinder 2 is stopped, and the fork 3 automatically stops at the height of the fork lift stop position H2. Thereafter, as shown in FIG. 13, the lift stop position display portion 213M. The arrow light emitting portion C and the frame light emitting portion D are switched to the still display.

(4) When the lift lever 12 is returned to the neutral position, the switch 1 from the lift lever 12 is moved.
Since the 2A output disappears, the CPU 101 switches from the lift automatic stop mode to the release mode, and the display unit 213M
Displays only the number 2 and the fork mark.

(5) Setting of plural fork lift stop positions Push button switch 1 for switching lift automatic stop / release mode
While pressing 3B, the lift lever 12 is operated to raise the fork 3, so that the fork 3 moves to the fork lift stop position H.
When the fork 3 is lifted to 1, the fork 3 is stopped from being lifted and the setting display button switch 215D is pressed,
When the fork 3 is raised to the fork lift stop position H2, the setting display button switch 215M is pressed, and when the fork 3 is further raised to raise the fork 3 to the fork lift stop position H3, the setting display button switch is pushed. By pressing 215U, three fork lift stop positions H1, H2, H3 can be set.

After performing the above setting, when the lift lever 12 is operated to raise the fork 3 while pressing the push button switch 13B for automatic lift / stop mode switching, the fork 3 stops at the fork lift stop position. Until rising to H1, the arrow light emitting portion C and the frame light emitting portion D of the lift stop position display portion 213D continue to display flicker, and the fork lift stop detected by the fork lift sensor 14B is stored in the memory unit 102. When the value matches the value of the position H1, the fork 3 automatically stops at the height of H1 and the arrow light emitting portion C and the frame light emitting portion D are switched to the stationary display.

When a plurality of fork lift stop positions are set as described above, the fork 3 is moved to the fork lift stop position H.
Fork lift stop position H
When the operator wants to lift to 2 and stop, the lift lever 12 is operated to lift the fork 3 without pressing the lift automatic stop / release mode switching pushbutton switch 13B, and the fork 3 moves to the fork lift stop position H1. If the push button switch 13B is pressed after the buzzer 51 has sounded and the CPU 101 is switched to the automatic lift-and-stop mode, the CPU 101 sends a flicker display command for blinking the display unit 213M to display the display unit 213M. When the arrow light emission part C and the frame light emission part D are displayed in blinking, and the detected value of the fork lift sensor 14B matches the value of the lift stop position H2 stored in the memory unit 102, the oil to the proportional proportional valve 7A is oiled. Is stopped and the fork 3 automatically stops at the height of the fork lift stop position H2, and thereafter the lift stop position display 213M displays. Indicia emitting unit C and the frame light emitting portion D is switched to the still lighted.

(6) When it is desired to reset the above setting, the value of H2 written in the memory unit 102 is erased by pressing the setting display button switch pressed for setting, for example, 215M again. Setting display button switch (set button switch) 215M
The number and the fork mark indicating the number of steps disappears.

In the present embodiment, the display panel section 200A of the display device 200 provided on the driver's cab is displayed in the traveling display mode /
Since it is possible to switch to the charge display mode, it is possible to display twice as much information on one panel surface.

Further, in this embodiment, since information relating to these is displayed when the vehicle is traveling and loading and unloading work, and information relating to this is displayed when the battery is charged, the driver wants even if there is a large amount of information to be displayed. Information can be obtained instantly and accurately.

Since information necessary for traveling operation and cargo handling work and maintenance information are displayed, even an unskilled driver can safely carry out traveling and cargo handling work.

[0069]

As described above, according to the present invention, one display panel is used by switching between the traveling / cargo handling display mode / charging display mode, and during traveling / cargo handling work, information regarding these is displayed to charge the battery. Since information related to this is sometimes displayed, a large amount of information can be displayed on one display panel, and moreover, the operator can obtain the desired information instantly and accurately. Security and safety can be improved.

[Brief description of drawings]

FIG. 1 is a front view in a traveling mode according to an embodiment of the present invention.

FIG. 2 is a front view showing a charging mode according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a forklift truck embodying the present invention.

FIG. 4 is a diagram showing a control device of the forklift.

FIG. 5 is a diagram showing a fork lift sensor in the embodiment of the forklift.

FIG. 6 is a diagram showing a tilt angle sensor in the embodiment of the forklift.

FIG. 7 is a diagram showing an output waveform of a variable resistor 22 in the embodiment of the forklift.

FIG. 8 is a diagram showing a waveform of a motor speed command based on an output of a variable resistor 22 in the embodiment of the forklift.

FIG. 9 is a diagram showing an output waveform of the variable resistor 21 in the embodiment of the forklift.

FIG. 10 is a diagram showing a waveform of a motor speed command based on the output of the variable resistor 21 in the embodiment of the forklift.

FIG. 11 is a diagram for explaining a fork lift stop position in the above embodiment.

FIG. 12 is a diagram showing a relationship between a fork lift stop position setting display button switch and a fork lift stop position display portion in the above embodiment.

FIG. 13 is a diagram for explaining the switching operation of the fork lift stop position display portion in the above embodiment.

FIG. 14 is a diagram showing an example of a conventional display device.

[Explanation of symbols]

1 Car Body 2 Mast 3 Fork 4 Car Body 5 Lift Cylinder 7A, 7B Proportional Valve 8 Pump 9 Pump Motor 11 Tilt Lever 12 Lift Lever 13A Push Button Switch for Lift Operation Automatic Stop / Cancel Mode 13B Lift Operation Automatic Stop / Cancel Mode Switching Push button switch 14A Fork lift sensor 14B Fork lift sensor 33 Valve control circuit 34A to 34C Fuse 36A to 36C Fuse cut sensor 37 Pulse pickup 39 Battery voltage detector 39 Battery fluid detector 40 Brake fluid detector 41 Parking brake interlocking Switch 44 Load sensor 45 Battery charger 46 Charger operation panel 47A Normal charge push button switch 47B Equal charge push button switch 48 Charging current detector 49 Key switch 50 Accelerator 51 Buzzer 100 Control device 101 CPU 102 Memory unit 200 Display device 200A (233) Display panel section (liquid crystal panel) 200B Setting panel section 200C Setting panel section 231 CPU 232 Memory unit

Claims (10)

[Claims] 1. A lift lever, a transducer for converting a lift operation amount of the lift lever into an electric signal, a lift cylinder for moving a fork up and down, a tilt lever, and a transducer for converting an operation amount of the tilt lever into an electric signal. A tilt cylinder that tilts the fork, a hydraulic pump that supplies and discharges pressurized liquid to the lift cylinder and the tilt cylinder, and a first valve provided in a pipe that connects the hydraulic pump and the lift cylinder. ,
A second valve provided in a pipe connecting the hydraulic pump and the tilt cylinder and a control device are provided, and the control device inputs the output of the transducer and processes the output by the arithmetic processing device. In a battery-powered forklift that controls the motor speed of the hydraulic pump and the opening / closing of the valve, the display panel section of the display device installed in the cab is
A display device for a forklift cab, which can be switched between a cargo handling display mode and a charge display mode. 2. The display device for a forklift cab according to claim 1, wherein the switching between the traveling / cargo handling display mode / charging display mode is automatically performed by turning on / off a key switch. 3. The display panel section of the display device includes a specification display section for displaying numbers, a status display section for increasing or decreasing the display area, an abnormality display section for displaying marks, and a mode display section for displaying charging / charging reservation mode types. The display device for a forklift cab according to claim 1 or 2, further comprising: 4. The display device for a forklift cab according to claim 3, wherein the specification display unit for displaying numerical values performs display operation in both the traveling / cargo handling display mode and the charging display mode. 5. The forklift driver's cab according to claim 3, wherein the battery status display section of the status display sections whose display area increases and decreases performs display operation in both the traveling / cargo display mode and the charge display mode. Display device. 6. The display panel unit has a fork horizontal posture display unit, and the fork horizontal posture display unit displays a mark when the fork horizontal posture is displayed.
Display device for forklift cab described. 7. The display device for a forklift cab according to claim 1, wherein the display panel unit is a liquid crystal panel. 8. The display device has a setting panel section, and the setting panel section has a changeover switch for switching the display contents of the data display section of the numerical display. Forklift cab display device. 9. The setting panel unit has a set button switch for setting one or more fork lift stop positions, and the display panel unit displays each of the one or more fork lift stop positions. The display device for a forklift cab according to claim 8, further comprising: 10. The setting panel unit comprises a charge reservation time setting push button switch.
Display device for forklift cab described.