JPS6264630A - Control device for special purpose vehicle - Google Patents

Abstract

PURPOSE:To prevent a hydraulic pump from being damaged by releasing a flywheel PTO from a hydraulic pump when a clutch pedal is stepped while a vehicle is running. CONSTITUTION:When a PTO-on switch 17 is actuated, as a circuit is built up among a contact X2, a clutch switch 16, a contact X3, a PTO-off switch 18, and a relay 19, the relay 19 is in the condition of self-hold. This causes an electromagnetic clutch to be actuated so as to allow a fly wheel PTO to be connected with a hydraulic pump. In this case, if the PTO-off switch 18 is actuated, a self-hold circuit is released allowing the fly wheel PTO to be disconnected from the hydraulic pump. And when the clutch switch 16 is turned off by stepping a clutch pedal, the self-hold circuit is also released.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a specially equipped vehicle in which a hydraulic pump is driven via a flywheel PTO.

(Prior art) Conventionally, special vehicles such as garbage collection vehicles have been used as shown in Figure 3.
A hydraulic pump a that supplies hydraulic pressure to various actuators is provided, and in order to operate this hydraulic pump a,
A configuration is used in which a flywheel PTOc is connected to an engine b, and this flywheel PTOC is connected to a hydraulic pump a via an electromagnetic clutch d. In addition,
e is a transmission, and f is a clutch that connects engine b and transmission e.

(Problems to be Solved by the Invention) However, in this type of specially equipped vehicle, the operation of the electromagnetic clutch is switched manually by the operator.
If the vehicle is driven with this electromagnetic clutch in the engaged state, the hydraulic pump will be in continuous operation, which poses the problem of seizure and damage to functional parts.

(Means for Solving the Problems) According to the present invention, a body is mounted on a vehicle frame, and a hydraulic pump that supplies hydraulic pressure to a hydraulic actuator for driving the body is operated via a flywheel PTO. In a specially equipped vehicle, an electromagnetic clutch connects and disconnects the hydraulic pump and the flywheel PTO.

and an operation switch that controls ON/OFF of the electromagnetic clutch, and a self-holding circuit that holds the electromagnetic clutch in a connected state when the operation switch is turned on is configured, and this self-holding circuit is interlocked with the disengagement operation of the traveling clutch. It is released by an electrical contact.

(Function) When driving the body of a specially equipped vehicle 1. For example, when loading or discharging a garbage truck, the self-holding circuit is activated by operating the ignition switch and the operation switch that turns on the electromagnetic clutch. The clutch is engaged.

The flywheel PTO and hydraulic pump are connected. In this state, if you operate the operation switch that disengages the electromagnetic clutch or depress the clutch pedal while driving,
The self-holding circuit is released and the flywheel PTO
and the hydraulic pump are disconnected.

(Example) Two examples of the present invention will be described below with reference to the drawings.

FIG. 2 shows a garbage collection vehicle as a specially equipped vehicle according to the present invention, in which a garbage disposal device 4 is installed in the rear opening 3 of a garbage storage box 2 mounted on a vehicle frame l.

This garbage processing device 4 loads and discharges garbage, and is provided with various driving hydraulic actuators, and a hydraulic pump that supplies hydraulic pressure to the hydraulic actuators is driven via a flywheel PTO.

A garbage disposal frame 5 is pivotally attached to the upper part of the opening of the garbage storage box 2 with pins 6, and the lower part of the garbage disposal frame 5 and the vehicle frame 1 are secured with lashing claws 13. This lashing pawl 13 is actuated by a lashing cylinder 14. The push plate 8 is pivotally supported at its proximal end by a push plate actuation cylinder 7, and is rotatable by the push plate actuation cylinder 7. The rotary plate IO conveys the garbage to a proper pushing position 9 of the pushing plate 8, and is rotationally driven by a one-turn plate driving motor (not shown). In addition, 15 in Figure 1 is in contact with the base end of the pushing plate 8.
This is a stopper that regulates the swing position of the Garbage is loaded into the garbage storage box 2 by sequential operation of the pushing plate 8 and the rotary plate 10 having such a structure.

Note that both the pushing plate 8 and the rotary plate 100 are controlled so as not to interfere with each other.

On the other hand, the other end of the dump cylinder 12, whose base end is pivotally supported on the vehicle frame 1, is pivotally supported on the garbage storage box 2, and this garbage storage box 2 is tilted appropriately by the expansion and contraction operation of the dump cylinder 12, and is loaded. The system is designed to perform an operation for discharging the collected dust.

The hydraulic pump that supplies hydraulic pressure to various cylinders such as the push plate operating cylinder 7, the dump cylinder 12, and the securing cylinder 14 receives power from the engine, which is extracted by the flywheel PTO, through an electromagnetic clutch. (See Figure 3).

A sequence circuit for controlling the connection/disconnection state of this electromagnetic clutch is shown in FIG.

In FIG. 1, nine sequence circuits are constructed using a clutch switch 16 provided on the main body of the vehicle frame 1. This clutch switch 16 is a normally ON type switch that connects and disconnects the exhaust brake circuit, and is turned OFF when the driving clutch pedal is depressed.

Manually operated PTO contact switch 17. A series circuit 11 consisting of a Pro disconnection switch 18 and a relay 19 is connected to an electromagnetic clutch power source 1. Relay 19 is 4
It has four A contacts x1 to X, and B contacts x5+X6. A predetermined voltage is applied to the electromagnetic clutch power source V by operating an ignition switch (not shown).

A series circuit of an a contact X and an electromagnetic clutch solenoid sol is connected in parallel with the series circuit 11.

The clutch switch 1 is connected in parallel with the PTO contact switch 17.
A self-holding circuit is formed which holds itself under the condition of connection state 6. This self-holding circuit.

It is constituted by a series circuit consisting of the a-contact XZ+ x3 and the clutch switch 16. the a contact X;
is the contact point that connects and disconnects the garbage processing device 4, and the a contact x4
When the is in the closed state, the electrical protection voltage (2) is applied to the input side of the loading/discharging switching switch 20.

By switching the loading/discharging switch 20, an operating voltage can be supplied to either the loading operation control circuit 21 that controls the operation related to the loading process described above or the discharge operation control circuit 22 related to the discharging process. The contacts xS+X& are provided in series with the clutch switch 16 and control the connection/disconnection of the exhaust brake circuit.

In this sequence circuit, when the ignition switch is turned on, the electromagnetic clutch power source ■1 is applied.

At this time, when the PTO contact switch 17 is operated, the relay 19 is energized, the a contacts x1 to x4 are turned on, and the b
The contact point xStX& becomes leaf F. However, the a contact x2-
Since the circuit from clutch switch 16-a contact x3 to PTO disconnection switch 18-relay 19 is conductive, the relay 19 is self-held unless the PTO disconnection switch 18 is operated, and therefore the a contact x++X4 is turned ON and the electromagnetic clutch solenoid is activated. sol is excited, actuating the electromagnetic clutch and connecting the flywheel PTO and the hydraulic pump. Further, since the a contact x4 is turned ON at this time, by operating the loading/discharging changeover switch 2o, it is possible to perform the loading operation or the discharge operation instructed by the changeover switch 2o.

On the other hand, when the operator operates the PTO disconnection switch 18 in a state where such a self-holding circuit is formed, the above-mentioned self-holding circuit is released and the a contacts xt and x3 are turned off.
As a result, the electromagnetic clutch solenoid sol becomes de-energized, and the connection between the flywheel PT○ and the hydraulic pump is cut off.

By the way, when the second worker starts moving the garbage truck without operating the PTO disconnection switch 18, the clutch switch 16 is turned off by depressing the clutch pedal, and at this time, the above-mentioned self-holding circuit is also released. The electromagnetic clutch solenoid sol is also de-energized, and the electromagnetic clutch is turned off.

Although a garbage collection vehicle has been illustrated as a specially equipped vehicle of the present invention,
It may also be a specially equipped vehicle other than a garbage collection vehicle. Further, if the exhaust brake control electric contact that the vehicle is originally equipped with is used as an electric contact that is linked to the disengagement operation of the traveling clutch, there is no need to provide a new electric contact.

(Effects of the Invention) As described above, according to the present invention, even if two workers start driving with the electromagnetic clutch engaged, the electromagnetic clutch becomes disengaged when the clutch pedal is depressed during driving, and the flywheel The connection between the PTO and the hydraulic pump is released.
Hydraulic pump stops. Therefore, it is possible to prevent damage to functional parts such as the hydraulic pump due to operational errors by the nine workers.

[Brief explanation of drawings]

FIG. 1 is a sequence circuit diagram showing an embodiment of a control device for a garbage collection vehicle as a specially equipped vehicle according to the present invention. FIG. 2 is a partially cutaway rear side view showing an example of a garbage collection vehicle, and FIG. 3 is a schematic diagram illustrating the connection between the flywheel PTO and the hydraulic pump. 1... Vehicle frame 2... Garbage storage box 4... Garbage processing device 16... Clutch switch I7... PTO connection switch 18... PTO disconnection switch 19... Relay

Claims (1)

[Scope of Claims] 1) A specially equipped vehicle in which a body is mounted on a vehicle frame and a hydraulic pump that supplies hydraulic pressure to a hydraulic actuator for driving the body is operated via a flywheel PTO, wherein the hydraulic pump and an electromagnetic clutch that connects and disconnects the flywheel PTO and the electromagnetic clutch that turns on/off the electromagnetic clutch.
A self-holding circuit is configured to hold the electromagnetic clutch in the engaged state when the operating switch is turned on, and this self-holding circuit is released by an electric contact that is linked to the disengagement operation of the traveling clutch. A control device for a specially equipped vehicle characterized by: 2) The control device for a specially equipped vehicle according to claim 1, wherein the specially equipped vehicle is a garbage collection vehicle, and the operation of the garbage processing device of the garbage collection vehicle can be controlled only when the electromagnetic clutch is in the engaged state.