JPS582196Y2 - Ground-level lifting device for mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lifting device for a ground working machine for a mobile agricultural machine such as a combine harvester.

Conventionally, there has been an elevating device for this type of mobile agricultural machine in which the ground working machine is automatically lowered when the gear shift lever is set in forward mode, and the ground working machine is raised when the gear lever is set in reverse mode.

However, with such conventional devices, when driving on the road,
Alternatively, even when traveling during non-work such as when going over a ridge, the ground work equipment can be raised or lowered by operating the gear shift lever forward or backward.
Sometimes it got in the way of driving.

Therefore, the present invention provides a mobile agricultural machine that moves up and down in conjunction with the forward/reverse operation of the gear shift lever, and only when the work clutch of the ground working machine is connected, the shift lever and the ground working machine move up and down. Configure the devices to work together,
It is an object of the present invention to provide a lifting device for a ground working machine for a mobile agricultural machine, which eliminates the above-mentioned drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings as a lifting device for a combine reaping section.

As shown in FIG. 1, the combine 1 includes a reaping section 2, an operating section 3, a threshing/sorting section 5, and a running section 6.

The reaping unit 2, which is a ground work machine, has its upper part pivoted to a support shaft 7, and its upper end is pivoted to a piston rod 1 of a hydraulic cylinder device 10, whose one end is pivoted to the machine frame 8.
1 and is supported so that it can be raised and lowered.

The operating section 3 includes a reaping latch lever 12 and a speed change lever 1.
3 are arranged, and are connected to the reaping latch and the transmission, respectively.

As shown in FIG. 2, the reaping latch lever 12 is rotatably provided between stoppers 14 and 14, and a switch 15 is provided near the lever 12.

The switch 15 is arranged so that when the reaping latch is in the connected state, it comes into contact with the lever 12 and is in the closed state.

Further, as shown in FIG. 3, the gear shift lever 13 is rotatably provided along the guide hole 17 of the operation panel 160, and is actuated via a leaf spring 18, 19 near the guide hole 17. Switches 21, 22 for raising and lowering are provided.

FIG. 4 shows a hydraulic circuit for raising and lowering the reaping section 2. An electromagnetic control valve 26 having ascending and descending renoids 23 and 24 is connected to the left and right pressure chambers of the hydraulic cylinder device 10 and the oil tank 27. They communicate directly or via a pump 28.

Note that 30 is a relief valve provided in parallel with the pump 28 to drain excess pressure oil into the tank 27.

FIG. 5 shows a control circuit for raising and lowering the reaping section 2. In parallel with the manual operation switch 31, there are a main switch 32 of the automatic control circuit, a switch 15 operated by the reaping latch lever, and a speed change lever. Operated raising and lowering switches 21, 22 are provided, and in series with these are solenoids 23, 24 for raising and lowering the electromagnetic control valve and limit switches 33 for the upper and lower limits of the reaping section. .34 is provided.

Next, the effect will be explained.

Now, when the main switch 32 is turned on and the reaping latch lever 12 is brought into the connected state, the switch 15 is also brought into the closed state.

In this state, when the shift lever 13 is rotated in the direction of arrow A in Fig. 3 and put into forward mode, the combine 1 moves forward while reaping, and at the same time the switch 22 is closed via the leaf spring 19, allowing the combine harvester to move downward. Energize the solenoid 24.

As a result, the electromagnetic control valve 26 slides to the left in FIG.
The hydraulic cylinder device 10 contracts, and the reaping section 2 rotates clockwise around the support shaft 7 and descends.

When the reaping section 2 is lowered to a predetermined position, the lower limit switch 34 is opened, and the lowering of the reaping section 2 is stopped.

Next, in order to change the direction of the combine harvester 1, shift lever 1 is
3 in the direction of arrow B in FIG. 3, the combine 1 moves backward while remaining in the working state, and at the same time, the switch 21 is closed via the spring 18, and the lifting solenoid 23 is energized.

Therefore, the electromagnetic control valve 26 slides to the right in FIG. 4, extending the hydraulic cylinder device 10, and thereby the reaping section 2 rises.

When the reaping section 2 reaches a predetermined position, the upper limit switch 33 becomes open, and the ascent of the reaping section 2 is stopped.

Furthermore, from this state, when the reaping latch lever 12 is rotated to cut the reaping latte in order to cross over the ridge, etc.,
At the same time, the contact of the switch 15 is cut off and the switch 15 becomes open.

Therefore, in this state, even if the combine harvester 1 is moved forward by rotating the speed change lever 13 in the direction of arrow A, the reaping section 2 will not be lowered.

As explained above, according to the present invention, when the ground work machine is in a non-working state with the reaping latch disconnected, the gear shift lever 13
Even if the operator operates, there is no risk that the reaping section 2 will move up or down as a result of the operation, and there is no possibility that it will interfere with driving.

Also, if the reaping latch is engaged, the gear shift lever 1 will be automatically
Since the automatic lifting device for the reaping section 2 is activated by the operation in step 3, the operation is easy and there is no risk of erroneous operation.

[Brief explanation of drawings]

Figure 1 is a side view of a combine harvester to which the present invention is applied;
Figure 2 is a side view showing the reaping latch lever, Figure 3 is a plan view showing the speed change lever, Figure 4 is a hydraulic circuit diagram for raising and lowering the reaping unit, and Figure 5 is an electric circuit diagram for raising and lowering the reaping unit. It is. 1... Combine harvester, 2... Reaping section, 1
2... Reaping rat lever, 13...
Gear shift lever 15...Switch.

Claims (2)

[Scope of utility model registration request] (1) In a ground work machine of a mobile agricultural machine that moves up and down in conjunction with the forward/reverse operation of the gear shift lever, only when the work clutch of the ground work machine is in the connected state, the shift lever and the ground work machine move up and down. A ground work equipment lifting device for a mobile agricultural machine configured such that the lifting device is interlocked with each other. (2) the ground work machine is a reaping section of a combine harvester, and a switch is provided to detect connection of a reaping latte of the reaping section;
The ground work machine lifting device for a mobile agricultural machine according to claim 1, wherein the switch is interposed in a control circuit for lifting and lowering the reaping section that is linked to the operation of the speed change lever.