JPS594Y2 - Nouyou Tractor Niokaru Sagiyoukijiyougesouchi - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a working machine vertical movement device for an agricultural tractor.

Conventionally, a working machine attached to the rear of an agricultural tractor has been configured to be moved up and down by a hydraulic mechanism by manually operating a manual lever provided on the driver's seat of the tractor.

In addition, for a device that moves up and down using a known hydraulic mechanism, if the manual lever is placed in the intermediate position, a sensor placed near the work machine will detect the height of the work machine to the automatic mortar, and the work machine will be constantly moved. It was constructed so that work could be carried out by maintaining it at a predetermined height or depth (for example, the
(See Publication No. 650).

However, in the known example, it is difficult to fix the manual lever in the neutral position, and if the manual lever is placed in the center by mistake, the position is not neutral and there is a risk that the manual lever may be moved. Therefore, there is a lack of consideration for danger prevention,
Therefore, it was difficult to handle.

Therefore, the present invention has been devised to provide a rafter (for agricultural use) with a working machine, a hydraulic mechanism for manual control to move the working machine up and down,
and a manual lever for operating the hydraulic mechanism, and when the manual lever is tilted backward from the neutral position, the hydraulic mechanism causes the working machine to move upward to the lifting position. When the tractor is tilted forward from the neutral position, the hydraulic mechanism lowers the working machine to the working position, and furthermore, the agricultural tractor is provided with a fully automatic circuit hand switch, a relay, and the relay is energized. a relay switch in the self-holding circuit that turns on when the relay is energized; a relay switch in the work machine vertical movement automatic control circuit that turns on when the relay is energized; A switch in the starting circuit that turns on at the front, and a switch in the self-holding circuit that turns on when the manual lever is in front of point b, which is between the neutral position and the backward tilting position, are provided, and a sensor attached to the work equipment detects 0N. - The work machine is provided with a switch for upward movement and a switch for downward movement in the automatic vertical movement control circuit of the work machine to be turned off, the relay is grounded via the switch in the starting circuit, and the relay is connected to the relay in the self-holding circuit. The switch is grounded through the switch in the self-holding circuit, and the switch in the automatic control circuit for vertical movement of the working machine connects a solenoid for raising the working machine with an automatic control hydraulic mechanism and a switch in the automatic vertical movement control circuit for the working machine. The loop switch in the automatic control circuit for vertical movement of the work machine is connected to the solenoid for lowering the work machine using the automatic control hydraulic mechanism, and the switch for lowering the work machine in the automatic control circuit for vertical movement of the work machine. This is a working machine vertical movement device for agricultural tractors that is grounded via a switch.

To explain the example diagram, 1 is the overall main switch, 2 is a hand switch for a fully automatic circuit connected to the main switch 1, and the switch 2 is connected to a relay 3, which is turned on by energizing the relay 3. It is connected to both relay switches 4 in the machine vertical movement automatic control circuit, and the other relay 3 is grounded via the switch 8 in the starting circuit.

The switch 8 connects the shaft 6 to any position of the agricultural tractor 5.
This is a switch that is OFF when the manually operated manual lever 7 pivoted on the lever 7 is in the neutral position, but is ON when it is in front of point a between the neutral position and the forward tilted position.

Therefore, the relay 3 has a relay switch 9 in a self-holding circuit that turns ON when the relay 3 is energized.
is connected, and the switch 9 is grounded via the switch 10 in the self-holding circuit.

The switch 10 in the self-holding circuit is OFF when the manual lever 7 is fully tilted back, but is OFF when the manual lever 7 is forward of point b between the rearward tilted position and the neutral position.
It becomes N.

The relay switch 4 in the automatic control circuit for vertical movement of the work machine includes a lifting solenoid 11 for raising the work machine using an automatic control hydraulic mechanism attached to the agricultural tractor 5, and a lifting solenoid 11 for raising the work machine using an automatic control hydraulic mechanism attached to the agricultural tractor 5. The lowering solenoids 13 for raising the work equipment are connected in parallel, and the lowering solenoids 11 for raising the work equipment by the automatic control hydraulic mechanism are grounded via the lifting switch 12, and the automatic control hydraulic mechanism is used to raise the work equipment. A lowering solenoid 13 for lowering the machine is grounded via a lowering switch 14.

Therefore, the front end of the connecting rod 15 is fixed to the intermediate position in the length direction of the manual lever 7, and the rear end of the connecting rod 15 is connected to a rotating shaft that protrudes from a case 16 provided at an arbitrary location on the agricultural tractor 5. connected to the upper end of the moving lever.

Both the switch 8 in the starting circuit and the switch 10 in the self-holding circuit are provided inside the case 16.

Further, a sensor 18 is attached to the working machine 17, and a case 19 housing an upward movement switch 12 and a downward movement switch 14, which are activated by the vertical movement of the sensor 18, is arranged near the case 19, and the case 19 and the sensor 18 are connected to each other. , are connected by 20 links.

Next, we will discuss the effect.

When the work machine 17 of the present invention is moved backward by holding the manual lever 7, the hydraulic mechanism for manual control works and can be lifted to an upper position, and when the manual lever 7 is tilted forward, the manual control The working hydraulic mechanism is released and the work implement 17 can be lowered (the above is a well-known configuration).

However, the manual lever 7 also has the following function.

That is, main switch 1 and hand switch 2 for fully automatic circuit.
are both turned on, and then tilt the manual lever 7 from the neutral state to the forward tilted state, and when it crosses point a in the middle, it will move into the case 16 via the connecting rod 15 attached to the manual lever 7. Switch 8 in the built-in starting circuit
Turn on.

Therefore, the current flows from the main switch 1 to the fully automatic circuit hand switch 2 to the relay 3 to the switch 8 in the starting circuit to the ground, and since the relay 3 is energized, the relay switch in the work machine vertical movement automatic control circuit 4 and the loop switch 9 in the self-holding circuit are both turned on.

On the other hand, the switch 10 in the self-holding circuit, which is in a parallel circuit with the switch 8 in the starting circuit, is a switch that is always ON when the manual lever 7 is in front of point b, which is between the neutral state and the backward leaning state. When the relay switch 9 is turned on by the relay 3, the flow also flows from the main switch 1 to the fully automatic circuit hand switch 2 to the relay 3 to the relay switch 9 to the switch 10 in the self-holding circuit to the ground, and the switch in the starting circuit Even when relay 8 is turned off, relay 3 continues to maintain the energized state and performs so-called self-holding.

Therefore, by returning the manual lever 7 from the forward tilted state to the neutral state, even if the switch 8 in the starting circuit is turned OFF, the relay 3 continues to be energized, and the relay 3 continues to be energized, and the relay 3 continues to be energized, and the relay 3 remains energized even if the switch 8 in the starting circuit is turned off. Switch 4 also continues to be in the ON state.

If you work normally in this state, if the working state of the work equipment 17 becomes deeper than planned, the sensor 18 will automatically turn on the lifting switch 12, so the automatic control hydraulic mechanism will automatically turn on the lifting switch 12. A lifting solenoid 11 for raising the working machine is automatically operated, and the position of the working machine 17 is slightly raised by a hydraulic mechanism.

When the height of the work equipment 17 is adjusted to the correct height, the lifting switch 12 is automatically turned off by the action of the sensor 18, so that the lifting solenoid is turned off to raise the working equipment using the automatic control hydraulic mechanism. The action of the automatic control hydraulic mechanism 11 is automatically stopped, and the working machine 17 stops rising.

When the work equipment 17 becomes too high, the lowering switch 14 is turned on and the lowering solenoid 13 is activated to lower the work equipment using the automatic control hydraulic mechanism. is in the released state, and the work equipment 17
lower.

In this way, the lifting solenoid 1 is operated to raise the working machine by the automatic control hydraulic mechanism by the operation of the upward movement switch 12 and the downward movement switch 14 which are activated by the sensor 18.
1 and a lowering solenoid 13 for lowering the working machine by a hydraulic mechanism are operated alternately, and the height of the working machine is automatically controlled by the automatic control hydraulic mechanism.

As described above, the present invention includes the agricultural tractor 5, the working machine 17, and the agricultural tractor 5.
, a manual control hydraulic mechanism for moving the work implement 17 up and down, and a manual lever 7 for operating the hydraulic mechanism, and when the manual lever 7 is tilted backward from the neutral position, the hydraulic mechanism The working machine 17 is moved upward to the lifting position, and when the manual lever 7 is tilted forward from the neutral position, the hydraulic mechanism lowers the working machine 17 to the working position, Furthermore, the agricultural tractor 5 is equipped with a fully automatic circuit hand switch 2 and a relay 3.
, a relay switch 9 in the self-holding circuit that turns on when the relay 3 is energized, a relay switch 4 in the work machine vertical movement automatic control circuit that turns on when the relay is energized, and the manual lever 7. A switch 8 in the starting circuit is turned on before point a between the neutral position and the forward tilted position, and a switch 8 in the self-holding circuit is turned on when the manual lever 7 is turned on before point b between the neutral position and the rearward tilted position. In addition to providing a switch 10, the work machine 17 is provided with switches 12 and 14 for upward movement and downward movement in the automatic vertical movement control circuit of the work machine, which are turned on and off by a sensor 18 attached to the work machine. The relay 3 is grounded via a switch 8 in the circuit, and the relay 3 is grounded via a relay switch 9 in the self-holding circuit and a switch 10 in the self-holding circuit. 4 is an automatic control hydraulic mechanism that is grounded via a lifting solenoid 11 for lifting the working machine and a lifting switch 12 in the automatic vertical movement control circuit for the working machine, and a relay in the automatic vertical movement control circuit for the working machine. Since the switch 4 is a lowering solenoid 13 for lowering the working machine with an automatic control hydraulic mechanism and a lowering switch 14 in the automatic control circuit for vertical movement of the working machine, the switch 4 is a working machine vertical movement device for an agricultural tractor that is grounded. B. By holding the manual lever 7 and tilting it forward, the work implement 17 can be lowered to the working position. By tilting the manual lever 7 backward, the work implement 17 can be lifted upward. , C. Once the manual lever 7 is pulled backward and then returned to the neutral position (neutral), the work equipment 17 can be stopped at the desired height position. 2. After the manual lever 7 is once pushed forward When the work equipment 17 is returned to the neutral position, the height of the work equipment 17 can be automatically adjusted by the action of the sensor 18 attached to the work equipment 17. It can be operated freely with only the hand switch. When the work equipment was switched from automatic control to manual control and the agricultural tractor was running with the work equipment raised, I accidentally switched off the hand switch 2 for the fully automatic circuit. Even if it is turned ON, the switch 8 in the starting circuit remains OFF, so the circuit is not configured and the working machine does not descend, thereby preventing danger.

[Brief explanation of the drawing]

FIG. 1 is a side view, and FIG. 2 is a circuit diagram. Explanation of symbols 1... Main switch, 2...
... Hand switch for fully automatic circuit, 3 ... Relay, 4 ... Relay switch in automatic vertical movement control circuit of work machine, 5 ... Agricultural tractor, 6.
...shaft, 7...manual lever, 8...switch in the starting circuit, 9...relay switch in the self-holding circuit, 10...self-holding circuit 11... Solenoid for raising the working machine by a hydraulic mechanism, 12... Switch for lifting, 13... For lowering by lowering the working machine by a hydraulic mechanism. Solenoid, 14... Lower movement switch, 15... Connection rod, 16... Case, 17... Work equipment, 18... Sensor 19...case, 20...continuation.

Claims (1)

[Scope of utility model registration request] An agricultural tractor is provided with a working implement, a manual control hydraulic mechanism for moving the working implement up and down, and a manual lever for operating the hydraulic mechanism, and when the manual lever is tilted backward from a neutral position, The working machine is moved upwardly to a lifting position by a hydraulic mechanism, and when the manual lever is tilted forward from a neutral position, the hydraulic mechanism lowers the working machine to a working position, Furthermore, the agricultural tractor includes a fully automatic circuit hand switch, a relay, a relay switch in a self-holding circuit that turns on when the relay is energized, and a relay switch that turns on when the relay is energized.
The relay switch in the automatic vertical movement control circuit of the working machine and the manual lever located at a position between the neutral position and the forward tilted position
A switch in the starting circuit that is turned ON before the point B, and a switch in the self-holding circuit that is turned ON before the manual lever is in the middle of the neutral position and the backward leaning position, and a sensor attached to the work equipment. 0N-
The work machine is provided with a switch for upward movement and a switch for downward movement in the automatic vertical movement control circuit of the work machine that is turned off, the relay is grounded via the switch in the starting circuit, and the relay is connected to a relay switch in the self-holding circuit. and grounded through a switch in the self-holding circuit,
The relay switch in the work machine vertical movement automatic control circuit is grounded via a solenoid for raising the work machine with the automatic control hydraulic mechanism and the lifting switch in the work machine vertical movement automatic control circuit. The relay switch in the automatic control circuit is a solenoid for lowering the work machine using the hydraulic mechanism for automatic control, and the lowering switch in the automatic control circuit for vertical movement of the work machine is connected to the ground for the vertical movement of the work machine on an agricultural tractor.