JPS6016275Y2 - Lifting device for work equipment in combine harvesters - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lifting device for a working machine in a combine harvester.

Generally, when the shift lever of a combine harvester is set to the reverse position, the pre-processing section is automatically raised to facilitate backward movement.

However, when mowing along the edge of a ridge or cutting along a road, the tip of the pretreatment section that automatically rises when reversing catches the ridge or road, which can lead to accidents such as damage to the pretreatment section. Something happened.

The purpose of this invention is to solve the above-mentioned problems, and to prevent the pre-processing part from getting caught in the ridges and damaging it when mowing along the ridges, etc., even though it is a combine harvester in which the pre-processing part automatically rises when reversing. An object of the present invention is to provide a lifting device for a working machine in a combine harvester.

The elevating device for a working machine in a combine harvester of the present invention that achieves the above object is such that, in a combine that automatically raises the front processing section when the machine moves backward, the preprocessing section is automatically raised during the automatic lifting mechanism of the front processing section when the machine starts moving backward. The present invention is characterized by being provided with an automatic stopping device that temporarily stops raising the part at a predetermined height, and an automatic lifting device that raises the part again from the stopping position after a certain period of time or after retreating a certain distance.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Details will be explained below with reference to embodiments of the present invention shown in the drawings.

Fig. 1 is a schematic side view of a combine harvester equipped with the lifting device of the working machine of the present invention, Figs. 2 A and B are a side view and a plan view of the operating lever for lifting and lowering the preprocessing section of the same device, and Fig. 3 is a FIGS. 4A and 4B are a side view of the latch pedal for driving, and a side view and a plan view of the shift lever for switching forward and backward.

As shown in FIG. 1, a preprocessing section 1 mounted on the front part of a combine harvester is raised and lowered by a hydraulic cylinder 2. As shown in FIG.

As shown in FIG. 2, this lifting operation can be performed by setting the operating lever 3 provided on the combine main body from the neutral position N to the raised position U to raise the combine harvester, and by setting it to the lowered position to lower the combine harvester.

When going backwards, depress the running latch pedal 4 shown in Fig. 3, disengage the clutch, then set the shift lever 5 in Fig. 4 to the reverse position R, and then release the running latch pedal 4. The clutch engages and the aircraft moves backwards.

The operating lever 3 for raising and lowering the pre-processing section 1 is provided with a switch 6 at the ascending position U and a switch 7 at the descending position, which are turned ON when the operating lever 3 is set to each position. It's supposed to be.

Further, the latch pedal 4 used for running is provided with a switch 8, which is turned off when the latch pedal 4 used for running is depressed.

Furthermore, a switch 9 is provided on the shift lever 5 for switching between forward and forward travel, and is turned on when the shift lever 5 is set to the reverse travel position R.

The pre-processing section 1 of the combine harvester according to the present invention first rises from a working position A to a slightly elevated position B when starting to move backward,
Thereafter, when the combine harvester body reaches a position where it has retreated from the ridge 50, it further rises to a raised position C.

Such an operation prevents the front end of the preprocessing section 1 from getting caught in the ridge 50 due to a sudden rise during backward movement, thereby preventing the preprocessing section 1 from being damaged.

The hydraulic/electrical circuit shown in FIG. 5 is one embodiment for performing the above operations.

As shown in FIG. 5, the hydraulic cylinder 2 that operates the pretreatment section 1 is operated by pressure oil supplied from a hydraulic pump 11 via a solenoid valve 10.

12 and 13 are oil tanks for pressure oil, and 14 is a pressure valve.

When the solenoid valve 10 is in the neutral position, the valve 10n is
When ascending, the valve 10u is interposed between the hydraulic pump 11 and the hydraulic cylinder 2. When descending, the valve 10u is interposed between the hydraulic pump 11 and the hydraulic cylinder 2. At the waist neutral position, pressure oil is stationary within the hydraulic cylinder 2, and when ascending, pressure oil is supplied, and when descending. Occasionally allow pressure oil to be discharged.

The above-mentioned solenoid valve 10 is operated by energizing and operating the solenoid 15 when ascending, and by energizing and operating the solenoid 16 when descending.

17 and 18 are return springs, respectively.

In the electric circuit, 19 is a power source, and when the operating lever 3 of the preprocessing section 1 is set to the up position U or the down position, the switch 6 or 7 is turned on, so a closed/open circuit including the solenoid 15 or 16 is formed. This operation lever 3 allows the preprocessing section 1 to be raised and lowered.

When the operating lever 3 is operated, the manual override relay 26 is actuated to turn off the contact 27, so that manual operation is possible independently of the automatic operating circuit described later.

When retreating from the ridge during ridge work, first turn off the switch 8 by depressing the running latch pedal 4.
After setting the shift lever 5 to the reverse position R, the switch 9 is turned on.

Next, when you release your foot from the running latch pedal 4, the switch 8 turns on.
As a result, the circuit including the timer-equipped relay 20.21 becomes closed/opened, and this timer-equipped relay 20.21 is activated.

The contacts 22 are turned OFF at the same time by the operation of the relay 20 with a timer.
It will turn on, but it will turn off immediately after a very short few seconds.

Due to the activation of the contact point 22 in this manner, the lifting solenoid 15 is activated for a short time, and the pre-processing section 1 is raised by the lifting operation of the hydraulic cylinder 2.

Then, when the pre-processing section 1 rises to the position B in FIG. 1, the contact 24 is turned off and the automatic raising of the pre-processing section 1 is stopped.

On the other hand, the timer relay 21 is made up of an OR circuit between the distance the aircraft has moved backwards and the time since it started moving backwards, and when either of these conditions is reached, it turns on the contact 23 and operates the ascending solenoid 15. The pretreatment section 1 is further raised via the hydraulic cylinder 2.

Then, when the preprocessing section 1 rises to the position C in FIG. 1, the contact 25 is turned off, and the automatic raising of the preprocessing section 1 is stopped.

Further, the contacts 24, 25 described above serve to prevent the solenoid 15 from operating even if the timer relay 20, 21 is turned on again due to, for example, half-clutch driving.

With the above-described device, it is possible to prevent an accident in which the tip of the pretreatment section gets caught in the ridge and is damaged when the machine moves backward during ridge mowing or the like.

Furthermore, if the aircraft continues to make a turn while going backwards, the pre-treated grass on the inside of the turn cannot leave the ridge, so it may end up pushing into the ridge.

The embodiments shown in FIGS. 6 and 7 are designed to prevent accidents when the vehicle is traveling backwards as described above.

As shown in FIG. 6, the apparatus of this embodiment is provided with stress detection means 32.32 made of piezoelectric elements etc. on both sides of the weeding bodies 31.31 in the pretreatment section 1. When stress is detected, the relay 33 in the electric circuit shown in FIG.
It is configured to be F.

Therefore, if one or both of the left and right weeding bodies 31 gets caught in the ridge during the automatic lifting of the pretreatment section 1, the stress detection means 32 detects the stress and activates the relay 33, and the switch 3
4 is turned off, the solenoid 15 is no longer activated and the automatic lifting of the pretreatment section 1 is stopped.

In the hydraulic/electrical circuit shown in FIG. 7, the stress detection means 32 described above
, relay 33, and contacts 34 are the same as those shown in FIG.

As mentioned above, in the combine harvester of the present invention, the lifting device for the work equipment automatically raises the pre-processing section when the machine moves backward, and during the automatic lifting mechanism of the pre-processing section, the pre-processing section is automatically raised when the machine starts moving backward. An automatic stop device that temporarily stops the ascent of the unit at a predetermined height, and an automatic lift device that raises the unit again from the stopping position after a certain period of time or after retreating a certain distance. Even if the combine harvester is designed to rise automatically, it is equipped with an automatic stop device installed in the automatic lifting mechanism to temporarily stop the rise of the preprocessing part at a predetermined position. It is possible to prevent accidents such as damage caused by

In addition, if a safety device is installed that is linked to a sensing device that detects overload acting on the preprocessing section, it can prevent the preprocessing section from getting caught on the ridges, etc., which tends to occur when reversing at the same time. It is also possible to prevent this.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a combine harvester equipped with the lifting device of the working machine of the present invention, Figs. 2 A and B are a side view and a plan view of the operating lever for lifting and lowering the preprocessing section of the same device, and Fig. 3 is a FIGS. 4A and 4B are a side view and a plan view of a shift lever for switching forward and backward movement, and FIG. 5 is a hydraulic and electric circuit diagram for operating the lifting device of the present invention. FIG. 6 is a schematic side view of the pretreatment section of an apparatus according to another embodiment of the present invention, and FIG. 7 is a hydraulic/electrical circuit diagram for operating the apparatus. 1...Pre-processing section, 2...Hydraulic cylinder, 3...Operation lever 4...Latch pedal for running, 5...Shift lever -16,7,8
, 9... Switch, 10... Solenoid valve, 11... Hydraulic pump, 15.16.
... Solenoid, 20.21 ... Relay with timer 22, 23, 24.25 ... Contact.

Claims (1)

[Claims for Utility Model Registration] 1. In a combine harvester in which the front processing section is automatically raised when the machine moves backward, the automatic raising mechanism of the front processing section is configured such that the front processing section is raised to a predetermined height when the machine starts moving backward. A lifting device for a work machine in a combine harvester, characterized in that it is provided with an automatic stopping device that temporarily stops the machine, and an automatic lifting device that raises it again from the stopping position after a certain period of time or after retreating a certain distance. 2. Claim for utility model registration that includes a safety device in the automatic lifting mechanism of the preprocessing unit that is interlocked with a sensing device that detects overload acting on the preprocessing unit and stops the automatic lifting of the preprocessing unit. A lifting device for a working machine in a combine harvester according to item 1.