JPH0314760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic lifting and stopping device for a battery forklift.

Prior Art As shown in Fig. 4, an electric motor 1 for driving a cargo handling hydraulic pump is provided, and a switch 3 that controls a contactor 2 that turns the electric motor 1 on and off is connected to an operating valve lever. By operating this operation valve lever part, the switch 3 is turned on (ON) and off (OFF), and the electric motor 1 is turned on and off.
In a battery forklift that can turn on (ON) and off (OFF), multiple micro switches 4-1, 4-2, and 4-3 are installed on the mast, and the lift height is set at a certain height (micro switch 4-
1, 4-2, 4-3). Also micro switch 4
-1, 4-2, 4-3 are automatic lift instruction switches 5
It is connected in series to the switch 3 via the switch, and automatic lifting can be performed by selecting one of the multiple micro switches 4-1, 4-2, and 4-3 provided on the mast using the hand-held selector switch. I was starting to be able to stop high.

Problems to be Solved by the Invention In the above-mentioned automatic lifting stop device, the automatic release after stopping the automatic lifting is manually operated by the automatic lifting instruction switch 5.
It was necessary to operate the button to release it, and improvements were requested.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to automatically stop the lift of a vertical forklift, which is capable of automatically canceling the automatic lift control by operating the operating valve lever part. The goal is to provide equipment.

Means and action for solving the problem When the operating lever section is operated from the non-operating position of the lift to the operating position, a signal is generated to drive the electric motor for driving the cargo handling hydraulic pump, and when the operating lever section is operated in the opposite direction, the electric motor is activated. An operating valve switch that generates a signal to stop the motor, a lift height sensor that detects lift height,
an automatic lifting height instruction switch for selectively instructing a predetermined lifting height instruction signal; and the lifting height instruction signal selected and instructed by the automatic lifting height instruction switch is inputted and activated;
When the lift height detection signal inputted from the lift height detection sensor matches the lift height instruction signal, an automatic lift height stop signal is output, and when a signal to stop the electric motor from the operation valve switch is inputted. , consists of a control circuit that disables the automatic lifting stop control when the lifting height instruction signal is released, and by operating the operating lever part, the operating valve switch is activated to perform automatic lifting height control and automatic lifting stop, and the operation Automatic lift control can be canceled when the valve switch changes from ON to OFF.

EXAMPLES The present invention will be described below with reference to FIGS. 1 to 3. In the drawing, RY ₀ , RY ₁ , RY ₂ are relays, 10
11 is an electric motor for driving a cargo handling hydraulic pump of a battery forklift; 11 is an operating valve switch; 12 is a first lift command normally open switch (a contact); 13 is a first command normally closed switch (b contact); 14 is a first command normally closed switch (b contact) 15 is a second lift command normally open switch (a contact), and 15 is a second command normally closed switch (b contact).

Normally open contacts of the electric motor 10 and relay RY ₀
RY′ ₀ is connected in series to the power supply 16.

Normally closed contact of operating valve switch 11 and relay RY ₁
RY ₁ , normally closed contact of relay RY ₂ RY ₂ and relay RY ₀
is connected in series to the power supply 16, and the operating valve switch 11, the normally open contact RY' ₁ of the relay RY ₁ , the first stage switch 17 of the mast section as a lift height detection sensor, and the relay RY ₀ are connected to the power supply. Furthermore, the operating valve switch 11, the normally open contact RY' ₂ of the relay RY ₂ , the mast second stage switch 18 as a lift height detection sensor, and the relay RY ₀ are connected to the power supply. 16 in series.

The normally closed contact RY ₀ of relay RY ₀ and the normally open contact RY′ ₁ of relay RY ₁ are the second command switch normally closed switch 15
and relay RY ₁ are connected in series to the power supply 16, and the first lift command switch normally open contact 12 and the second
Command switch normally open setting 15 and relay RY ₁ are connected in series to power supply 16.

The normally closed contact RY ₀ of relay RY ₀ , the normally open contact RY' ₂ of relay RY ₂ , the normally closed contact 13 of the first command switch, and the relay RY ₂ are connected in series to the power supply 16, and the second High command switch normally open contact 14, first command switch normally closed contact 13 and relay RY ₂ are power supply 16
is connected in series with.

Further, the operating valve switch 11 and the normally closed contact RY ₀ of the relay RY ₀ are connected via a lead wire 18'.

The operating valve switch 11 is provided on the operating lever of the operating valve, and is turned off (OFF) when the operating lever is in a position where the lift is inactive, and turned on (ON) when the operating lever is in a position where the lift is activated. .

Next, the operation will be explained.

When automatically stopping at the height of the first stage switch 17 of the mast section, the first lift command normally open switch 12 is turned off (OFF) → on (ON) → off (OFF).

For this purpose, relay RY ₁ is energized and the relay
The normally closed contact RY ₀ of RY ₀ , the first stage switch (not shown) of the second mast section is turned on (ON), and the second stage switch (not shown) of the second mast section is turned on (ON). relay RY ₁ via lead wire 18'
The relay RY 1 is energized through the normally open contact RY′ ₁ of the relay RY ₁ , and this relay RY ₁ is self-held and its normally closed contact RY ₁ is turned OFF. At this time, the height of the first stage switch 17 of the mast section is indicated by the first lifting height command normally open switch 12, and the first stage switch 17 of the mast section is turned on.

Operation valve switch 11 is off (OFF), normally open contact RY' ₁ of relay RY ₁ is on (ON), mast section first stage switch 17 is on (ON), relay
Ready when RY ₀ is off (OFF).

The automatic lift stop control is set as described above.

Next, the operating valve switch 11 is turned on (ON).
Then, the relay RY ₀ is energized through the normally open contact RY′ ₁ of the relay RY 1 and _the first stage switch 17 of the mast section, and is energized. For this reason, the normally open contact _RY'0 is turned ON, the electric motor 10 is driven, and the fork is raised.

Relay RY ₀ is energized and its normally closed contacts
RY ₀ is off (OFF), but operation valve switch 11 is on (ON) → normally open contact RY′ ₁ is on (ON) → second command normally open switch 15 is on (ON), so relay RY is turned on. ₁ is still retained.

When the lifting height stop position is reached, the first stage switch 17 of the mast section turns off (OFF), so a relay is activated.
RY ₀ is de-energized and its normally open contact
RY′ ₀ is turned off (OFF) and the electric motor 10 stops.

The relay RY ₁ remains held with the operation valve switch 11 turned on (ON) and the normally open contact RY' ₁ turned on (ON). Now, when the first stage switch 17 of the mast section is turned off (OFF), the first stage switch of the first mast section is also turned off (OFF), and when the operating valve section switch 11 is turned off (OFF), relay RY ₁ is energized. normally open contact RY′ ₁
It turns OFF and the holding circuit is released.

When canceling the automatic lifting stop control, for example, when canceling and canceling automatic lifting when the lifting stop position has not been reached, that is, when canceling automatic lifting work with the first stage switch 17 of the mast section turned on (ON), , the operating valve switch 11 is turned off.

Therefore, the normally open contact RY′ ₁ is turned off (OFF), and the holding circuit of the relay RY ₁ is released. The normally open contact RY ₁ then switches from OFF to ON, returning to the normal manual state.

In addition, if you want to cancel the automatic operation after reaching the lifting height stop position, turn off the operation valve switch 11 as described above and relay the
Just demagnetize RY ₁ .

When automatically stopping at the height of the second stage switch 13 of the mast section, the second lifting height command normally open switch 14 is turned off (OFF) → on (ON) → off (OFF) and relay RY ₂ is activated in the same manner as described above. Self-holding, the normally open contact RY' ₂ is turned on (ON), the mast section second stage switch 17 is turned ON, and then the operation section switch 11 is turned on (ON) in the same manner as described above.

Note that the first and second command normally closed switches 1
3 and 15 are emergency stop switches in the event of an abnormality, which can be operated at the same time and are turned off only when operated.Relay RY ₁
(or relay RY ₂ ), and when relay RY ₁ (RY ₂ ) is released,
The normally closed contact RY' ₁ (RY' ₂ ) changes from ON to OFF, the relay RY ₀ is no longer energized, the normally open contact RY' ₀ turns OFF, and the electric motor 10 stops.

The above-mentioned operation is shown in the operation chart of FIG.

What is shown in FIG. 3 is another embodiment of the invention. Reference numeral 20 in FIG. 3 denotes a hydraulic contactor, and the hydraulic contactor 20 is composed of a coil section 21 and a switch section 22 that is turned on by excitation of the coil section 21. 23 is an electric motor, and the switch portion 22 of the hydraulic conductor 20 and the electric motor 23 are connected in series to a power source 24.

Operation valve switch 25 and hydraulic contactor 20
The coil portion 21 and the transistor 26 are connected to the power supply 2.
4' in series.

Also, 27 is a one-shot timer,
28, 29, and 30 are first, second, and third set/reset flip-flops.

Input terminals A and B of one-shot timer 27
is connected to the operation valve switch 25, and the output terminal Q of the one-shot timer 27 is connected to the reset side input terminal R of each of the first, second, and third set/reset flip-flops 28, 29, and 30. It has been done.

A first stage instruction switch 31 is connected to the set input terminal S of the first set/reset flip-flop 28, and a second stage instruction switch 31 is connected to the set side input terminal S of the second set/reset flip-flop 29. 32 is connected, and a third stage instruction switch 33 is connected to the set side input terminal S of the third set/reset flip-flop 30. 1st, 2nd, 3rd
flip-flop 28 for setting and resetting the
One output terminal Q of each of the terminals 29 and 30 is connected to the first, second and third semiconductor relays 34 and 34, respectively.
35 and 36 to the input side of the OR circuit 37, and the first semiconductor relay 34
A mast section first stage switch 38 as a lift height detection sensor is connected to the mast section 2 switch 38 as a lift height detection sensor, and a mast section 2 switch 38 as a lift height detection sensor is connected to the second semiconductor relay 35.
A stage switch 39 is connected to the third semiconductor relay 36, and a mast section third stage switch 40 as a lift height detection sensor is connected to the third semiconductor relay 36.

The other output terminals of the first, second, and third set/reset flip-flops 28, 29, and 30 are connected to the input side of an AND circuit 41, respectively.
The output side of the transistor 1 is connected to the input side of an OR circuit 37, and the output side of the OR circuit 37 is connected to the base side of the transistor 26.

Next, the operation will be explained.

The third set/reset flip-flop 30 is set by instantaneously turning on the third stage instruction switch 33. It is output from the output terminal Q of the third set/reset flip-flop 30. This output terminal Q is connected to a third semiconductor relay 36, and this semiconductor relay 36 is opened and closed by turning on and off (ON, OFF) a third stage switch 40 of the mast section.

Third set/reset flip-flop 3
The output from the 0 output terminal Q is input to the OR circuit 37 of the logic circuit and turns on the transistor 26.

Automatic height stop control for the third stage is set by operating the mast section third stage instruction switch 40.

When the operation valve switch 25 is turned on, a current flows through the transistor 26, the coil section 21, and the operation valve switch 25, and the excitation of the coil section 21 turns on the switch section 22, driving the motor 23. be done.

Mast section third stage switch 40 is off (OFF)
Then, the transistor 26 is turned off, the excitation of the coil section 21 is released, the switch section 22 is turned off, and the motor 23 is stopped.

Also, turn off the operating valve switch 25.
When set, an off signal is input to the one-shot timer 27, and a signal is output from the output terminal Q of this timer. The output of this one-shot timer 27 is the third one.
The reset input terminal R of the set/reset flip-flop 30 is reset, the automatic lifting operation is canceled, and the normal manual state is returned.

Effects of the Invention Since the present invention is as described above, after operating the automatic lifting command switch, the operating valve section switch is actuated by operating the operating lever section to perform automatic lifting and automatically stop lifting. Automatic lift control can be canceled when the switch changes from ON to OFF.

In this way, automatic lifting height control can be automatically canceled by operating the operating lever section.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of one embodiment of the present invention, Fig. 2 is a diagram of the same operation, Fig. 3 is an explanatory diagram of the configuration of another embodiment of the invention, and Fig. 4 is a conventional automatic battery forklift. FIG. 2 is a configuration explanatory diagram of a lifting height stop device.

Claims (1)

[Claims] 1. When the operating lever section is operated from the non-operating position of the lift to the operating position, a signal is generated to drive the electric motor for driving the cargo handling hydraulic pump, and when the operating lever section is operated in the opposite direction, the electric motor is stopped. a lift height sensor that detects the lift height, an automatic lift height switch that selects and instructs a predetermined lift height instruction signal, and a lift height selected and instructed by the automatic lift height instruction switch. When an instruction signal is input and the lift height detection signal inputted from the lift height detection sensor matches the lift height instruction signal, an automatic lift stop signal is output, and the electric motor from the operation valve switch is activated. 1. An automatic lifting stop device for a battery forklift, comprising a control circuit that releases a lifting command signal and disables automatic lifting stop control when a signal to stop the lift is input.