JPH0790712B2 - Operation control device for riding type work machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for a riding type working machine equipped with, for example, a lawn mowing cutter, a plowing rotary, a snowplow, etc. and driven by an engine.

Conventional technology Conventionally, in the case of a riding type work machine as described above, the engine is automatically stopped depending on whether the worker is sitting in the driver's seat or the connection state of various power systems in consideration of the working situation, Alternatively, an interlock mechanism was provided to prevent the engine from starting (JP-A-60-1693).
32 publication).

Problems to be Solved by the Invention As shown in the same example, in this type of riding type work bar, the engine is automatically stopped by detecting the presence or absence of the seated worker, or the engine is not prepared. It was common to construct an interlock system in association with the engine, such as by making it impossible to start the engine.

Incidentally, if the engine stop and start are directly controlled in this way, the engine restart operation is frequently performed depending on the work mode, which may be troublesome.

In some circumstances, it may not be desirable to directly control the operating state of the engine, for example, when the operator leaves the seat and wants to stop the driving of the work machine without stopping the engine of the power source.

Means and Actions for Solving Problems The present invention has been made in view of the above points, and an object of the present invention is to stop only the working machine as necessary or maintain the stopped state to start the engine. The point is to provide an operation control device that does not affect continuous operation.

That is, the present invention provides, in a riding type work machine driven by an engine, an electric actuator for connecting / disconnecting power transmission of a power takeoff device, a seating switch for detecting whether or not a worker is seated on a seat, and PTO switch capable of on / off operation of the electric actuator, and turning on / off the electric actuator according to the operation of the PTO switch according to a combination of the detection signal of the PTO switch and the detection signal of the seating switch. A state in which the seating switch detects separation and the PTO switch is set to the ON operation side of the electric actuator. It is an operation control device for a riding type work machine, which is configured to be in the off-lock state when operated.

If the state switching means can be turned on and off, the electric actuator is turned on and off as it is when the PTO switch is turned on and off, and power transmission to the work machine is controlled.

However, when the seating switch detects separation and the PTO switch is operated to the ON side of the electric actuator, it is set to the off-lock state, the electric actuator is turned off, and the same off-state is maintained. The power transmission to the work machine is cut off regardless of the operating state of.

Further, the state switching means is in the off-lock state when the engine is started while the seating switch detects seating and the PTO switch is operated to the ON operation side of the electric actuator. With this configuration, even if the PTO switch is operated to the ON side of the electric actuator, the electric actuator is automatically set to the off-lock state according to the engine start operation, and the power is transmitted to the work machine. Can be cut off to smoothly start the engine.

Further, the state switching means is configured to release the off-lock state by operating the PTO switch to the off-operation side of the electric actuator in a state where the seating switch is detecting seating, Once in the off-lock state, the off-lock state can be released by switching the PTO switch to the off-operation side of the electric actuator, and the electric actuator can be returned to the on / off state.

EXAMPLE An example of the present invention shown in FIGS. 1 to 6 will be described below.

FIG. 1 is a side view showing a riding type working machine 1 to which the present invention is applied, 2 is a diesel engine, and 3 is a driver's seat.

The riding type working machine 1 is provided with a handle 4, a shift lever 5 and a clutch pedal 6 as a traveling operation operating member, and further includes a rotary work rail (not shown) attached to the riding type working machine 1 or a grass cutting cutter. PT that can turn ON / OFF the power supply to the electromagnetic solenoid as an electric actuator that transmits or cuts off the power of the engine 2 to the work machine
An O switch 7 and a parking brake lever 8 for parking are provided.

The shift lever 5 is a main shift lever for traveling, but when the lever 5 is set to the neutral position, the traveling drive system from the diesel engine 2 to the rear wheels 9 is cut off.

When the clutch pedal 6 is depressed, a traveling clutch (not shown) is disengaged and the traveling drive system is disengaged.

In this riding type work machine 1, a control circuit 10 of the operation control device according to the present invention is incorporated in, for example, the front panel of the driver's seat 3.

The detection means forming a part of the control circuit 10 is provided in each part of the machine body, that is, the neutral switch 11 is provided at a predetermined position of the shift lever 5 and is turned on when the shift lever 5 is in the neutral position. Then, the neutral state can be detected.

A parking brake switch 12 is provided at a predetermined position of the parking brake lever 8 and is turned on when the parking brake lever 8 is pulled.

A seat switch 13, which is an on / off switch, is built in the seating portion of the driver's seat 3. The seat switch 13 is turned on when the operator is seated, and is turned off when the operator leaves the seat.

FIG. 2 shows a circuit diagram of the operation control device in this embodiment having the above-mentioned detecting means 11, 12, 13 and the like.

The battery 20 is connected to one of the relay contacts 21b of the electromagnetic switch 21 and is also connected to the BAT terminal of the combination switch 23 via the fuse 22.

The other of the relay contacts 21b is connected to the starting motor 24.

The ST terminal of the combination switch 23 is connected to one of the normally open relay contacts 25b of the relay circuit 25, and the other of the relay contacts 25b is connected to the relay coil 21a of the electromagnetic switch 21.

The ON terminal of the combination switch 23 is connected to the preheating device 50, the engine stopping device 51, and the charging device 52 via the fuse 26 and the connecting wire 27.

The relay circuit 25 has a normally closed relay contact 25c in addition to the normally open relay contact 25b.
One end of the relay coil 25a of 5 and one of the relay contacts 25c are connected to the connection line 27.

The other of the relay contacts 25c is connected to one of the contacts of the parking brake switch 12 via a buzzer 28, and the other contact is grounded.

A parking brake pilot lamp 29 is connected in parallel with the relay contact 25c and the buzzer 28.

The other end of the relay coil 25a of the relay circuit 25 is connected to one contact of the neutral switch 11 and the other contact is grounded.

The other relay circuit 30 is a circuit for switching states, and includes a relay coil 30a, a normally open relay contact 30b, and a normally closed relay contact 30.
It consists of c and.

One of the two relay contacts 30b and 30c of the relay circuit 30 is connected to each other and connected to the connection line 27 through the contact of the front PTO switch 7, and the other contact of the relay contact 30b is one end of the relay coil 30a. The other contact of the relay contact 30c is connected to the other end of the electromagnetic solenoid 31 whose one end is grounded.

The electromagnetic solenoid 31 constitutes an electromagnetic clutch for connecting and disconnecting the transmission of the power of the engine to the working machine. In this embodiment, the electromagnetic solenoid 31 is disconnected in the off state.

One end of the relay coil 30a is grounded and connected to the electromagnetic solenoid 31 via a freewheeling diode 32.

Further, the other end of the relay coil 30a is connected to the ST terminal of the combination switch 23 via a backflow prevention diode 33, and is also connected to a timer and inverting circuit 34.

The timer and inversion circuit 34 is connected to the connection line 27 via the seat switch 13, and logically inverts to an off state when the seat switch 13 is in an on state (seated state) and an on state when the seat switch 13 is in an off state. At the same time, a logically inverted signal is output only when there is no seat within a certain time from when the user leaves the seat.

In other words, it does not work when the worker's waist is loose.

The timer and inversion circuit 34 is configured such that power is supplied from the connection line 27 when the seat switch 13 is turned on, but power is supplied from the connection line 27 'when the seat switch 13 is turned off.

The operation control device according to the present embodiment is configured as described above, and the combination switch 23 is in the ON state and the BAT
Terminal and ON terminal are connected, and BAT terminal and ON in the start state
Terminal and ST terminal are connected.

If the shift lever 5 is in the neutral position and the neutral switch 11 is on, the relay switch 25a is excited to make the relay contact 25b conductive, so that the combination switch 23
When is set to the start state, the electromagnetic switch 21 can be turned on to start the starting motor 24.

However, the starter motor 24 cannot be started when the shift lever 5 is not in the neutral position.

Further, when the parking brake lever 8 is pulled and the parking brake switch 12 is turned on, the current flows through the buzzer 28 and the parking brake pilot lamp 29 regardless of whether the combination switch 23 is in the start state or the ON state. The lamp is turned on together with the flow and alarm to inform the driver that the vehicle is not in the driving traveling state.

In the above case, if the neutral switch 11 is on (neutral state), the relay circuit 25a is excited,
Since the relay contact 25c is in the off state, the buzzer 28 does not drive and only the parking brake pilot lamp 29 lights up.

Next, regarding the operation of the electromagnetic solenoid 31, when the relay coil 30a of the normal relay circuit 30 is not excited, the relay contact 30c is in the conductive state and is in the on / off enable state, and the combination switch 23 is in the start state and The PTO switch 7 is turned on when operated in any of the ON states.
The electromagnetic solenoid 31 is turned on / off in response to the off position.

In order to explain other operations, only the essential parts are taken out,
A circuit diagram for each state is shown in FIGS. 3 to 5, and a comprehensive time chart is shown in FIG. 6, which will be described in accordance with the time chart.

For convenience of explanation, the timer circuit and the inverting circuit 34 are omitted and only the inverting circuit 34a is shown, and the timer operation is omitted in the description.

First, with the PTO switch 7 turned on, the operator
3rd when seated on seat (seat switch 13 is on)
This corresponds to a time of 3 A in the time chart of FIG. 6 in the state shown in FIG.

In this state, turn the combination switch 23
When switched to the N state, a current flows through the relay contact 30c to turn on the electromagnetic solenoid 31 as shown by a broken line in FIG. 3 (A), so that the power of the engine can be transmitted to the working machine.

When the electromagnetic solenoid 31 is thus turned on and the power transmission is possible, if the combination switch 23 is switched to the start state to start the engine, the third
As shown by the alternate long and short dash line in FIG. 6B, a current flows from the ST terminal of the combination switch 23 through the diode 33 to the relay coil 30a of the relay circuit 30 and is excited, so that the relay contact 30c is made non-conductive and at the same time the relay contact 30b is opened. Conduct.

Therefore, the electromagnetic solenoid 31 is turned off, the power transmission to the working machine is cut off, and at the same time, the current flowing through the electromagnetic solenoid 31 via the PTO switch 7 is conducted as shown by the broken line in FIG. 3 (B). It flows into the relay coil 30a through the relay contact 30b in the state, and excites the relay coil 30a to hold itself.

This state is the off-lock state in which the state in which the current to the electromagnetic solenoid 31 is cut off is maintained, and corresponds to the time of 3B in the time chart of FIG.

Even when the engine is started and the combination switch 23 is turned on, the off-lock state is maintained.

Even when the PTO switch 7 is turned on in this way, the electromagnetic solenoid 31 is automatically activated in response to the engine start operation.
Since the power transmission to the working machine is cut off by turning off the engine, the engine can be started easily.

After the relay circuit 30 is once in the off-lock state as described above, if the PTO switch 7 is turned off, the self-holding of the off-lock state is released and the PTO switch 7 is turned on again.
The electromagnetic solenoid 31 can be returned to a state in which it can be turned on and off according to an off operation.

Next, when the worker is leaving the driver's seat 3 with the PTO switch 7 in the OFF state, as shown in FIG.
The seat switch 13 is turned off, the logic is inverted by the inverting circuit 34a, and after the inverting circuit 34a is turned on, a current (two-dot chain line) flows through the relay coil 30a to excite the relay coil 30a and turn off the relay contact 30c. Then, the relay contact 30b is turned on.

Therefore, the electromagnetic solenoid 31 is in the off state, and the power transmission to the working machine is in the cutoff state. (Time of 4A in FIG. 6).

If the PTO switch 7 is turned on in such a state, the fourth
As shown in the figure (B), the current (broken line) flowing through the PTO switch 7 passes through the relay contact 30b and the relay coil 30a.
Since it is further excited, it becomes an off-lock state, and thereafter, the electromagnetic solenoid 31 is maintained in the off state regardless of whether or not the operator is seated (the seat switch 13 is turned on / off) (see FIG. 6). 4B time).

That is, even if the operator leaves the driver's seat 3 and turns on the PTO switch 7, the operator is in the off-lock state and the electromagnetic solenoid.
When 31 is in the off state, power transmission to the work machine remains blocked, and even when the worker sits down in this state, the electromagnetic solenoid 31 remains in the off state and power transmission remains blocked.

To release the off-lock state, sit down and press the PTO switch 7
You can reset.

Next, when the worker is seated and working with the working machine, that is, when both the seat switch 13 and the PTO switch 7 are in the ON state as shown in FIG. A current (broken line) that is not excited and passes through the PTO switch 7 flows through the electromagnetic solenoid 31 through the relay contact 30c to transmit power to the working machine (time 5A in FIG. 6).

Since the relay circuit 30 is in a state where it can be turned on and off, the PTO switch 7 can be turned off if the drive of the work machine is to be stopped.
Further, the drive of the working machine can be easily controlled by corresponding to the operation position of the PTO switch 7, such as turning on the PTO switch 7 when re-driving.

If the worker leaves the driver's seat 3 during work with the work machine, the seat switch 13 is pressed as shown in FIG. 5 (B).
Is turned off, and hence the inverting circuit 34a and thereafter are turned on, and a current (two-dot chain line) flows through the relay coil 30a to excite the relay coil 30a, turning off the relay contact 30c and turning on the relay contact 30b.

Therefore, the power supply to the electromagnetic solenoid 31 is cut off, and the current flowing through the PTO switch 7 (broken line) is changed from the relay contact 30c to the relay contact 30b to change the relay coil.
Flowing through 30a, the relay coil 30a is further excited to be in an off-lock state, and thereafter, the electromagnetic solenoid 31 is maintained in the off state, and power transmission to the working machine remains cut off (6B in FIG. 6). time of).

That is, when the worker leaves the driver's seat 3 while working the work machine, the electromagnetic solenoid 31 is automatically turned off, the power transmission to the work machine is cut off, and the work machine drive is stopped. To be done.

Although not shown in FIG. 5, since the timer circuit is actually built in as described above, the driving of the working machine is not stopped when the driver leaves the driver's seat 3 for only a short time when he / she floats.

To release this off-lock state, it is sufficient to sit down and reset the PTO switch 7.

When the off-lock state is set as described above (time 3B, 4B, 5B in the time chart of FIG. 6), the power transmission to the work machine is only cut off and the engine itself is not stopped. It is possible to avoid troublesome operations such as frequent engine restarts.

A pilot lamp may be provided in parallel with the electromagnetic solenoid 31 in order to inform the operator whether or not power is being transmitted to the work machine.

Although the electromagnetic clutch is driven by the electromagnetic solenoid 31 in the present embodiment, when a hydraulic clutch is used instead of the electromagnetic clutch, the hydraulic on-off valve may be driven by the electromagnetic solenoid.

EFFECTS OF THE INVENTION The present invention can automatically stop the power transmission of the engine to the working machine as necessary to stop only the working machine or maintain the stopped state. Has no effect.

Further, it is not necessary to frequently restart the engine, which simplifies the operation.

[Brief description of drawings]

FIG. 1 is a side view of a riding type working machine according to one embodiment of the present invention, FIG. 2 is a circuit diagram of an operation control device according to the same embodiment, and FIGS. 3, 4, and 5 are for different states. FIG. 6 is a general time chart of the same embodiment as that of FIG. 1 ... Riding type work machine, 2 ... Diesel engine, 3 ...
… Driver's seat, 4 …… steering wheel, 5 …… shift lever, 6…
… Clutch pedal, 7 …… PTO switch, 8 …… Parking brake lever, 9 …… Rear wheel, 10 …… Control circuit, 11
...... Neutral switch, 12 ...... Parking brake switch, 13 ...... Seat switch, 20 ...... Battery, 21 ...... Electromagnetic switch, 21a ...... Relay coil, 21b ...... Relay contact, 22 ...... Fuse, 23 ......
Combination switch, 24 …… Starting motor, 25 ……
Relay circuit, 25a …… Relay coil, 25b …… Normally open relay contact, 25c …… Normally closed relay contact, 26 …… Fuse, 2
7,27 '…… Connection line, 28 …… Buzzer, 29 …… Parking brake pilot lamp, 30 …… Relay circuit, 30c ……
Relay coil, 30b …… Normally open type relay contact, 30c …… Normally closed type relay contact, 31 …… Electromagnetic solenoid, 32 …… Recirculation diode, 33 …… Diode, 34 …… Timer and reversing circuit, 34a …… Reverse Circuit, 50 ... Preheating device, 51 ... Engine stop device, 52 ... Charging device.

Claims (3)

[Claims] 1. In a riding type working machine driven by an engine, an electric actuator for connecting and disconnecting power transmission of a power take-off device, a seating switch for detecting whether or not a worker is seated on a seat, and the electric machine. Type actuator can be turned on / off, and the electric actuator can be turned on / off according to the operation of the PTO switch according to the combination of the detection signal of the PTO switch and the detection signal of the seating switch. A state where the seating switch detects that the seat is released and the PTO switch operates to the ON operation side of the electric actuator. An operation control device for a riding type work machine, wherein the operation control device is configured to be in the off-lock state when being operated. 2. The off-lock when the engine is started while the seating switch detects seating and the PTO switch is operated to the on-operation side of the electric actuator. Claim 1 characterized in that it is configured to be in a state
The operation control device for the riding type work machine according to the item. 3. The state switching means is configured to release the off-lock state by operating the PTO switch to an off operation side of the electric actuator while the seating switch is detecting seating. The operation control device for a riding type work machine according to claim 1 or 2, characterized in that.