JPS608648Y2 - lift device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an elevating device for a working machine in a mobile agricultural machine, and particularly to an elevating device for a pre-processing section in a combine harvester.

Conventionally, in order to raise or lower the pre-processing section of a combine harvester, it was necessary to continue operating an elevator lever until the pre-processing section was raised or lowered to a predetermined position.

Furthermore, the range of elevation of the pre-treatment section varies depending on field conditions, making it difficult to maintain an appropriate cutting height and elevated position during turning.

For this reason, when a combine harvester is turned, the operation is complicated and causes erroneous operation when the pre-processing section is raised and lowered at the same time as the turning operation, and the operator is also fatigued. Ta.

Therefore, the present invention provides a detection mechanism that detects the relative position of the work equipment with respect to this machine, and also provides a selection device that arbitrarily selects the upper and lower stop positions of the detection mechanism, and further biases and holds the detection mechanism at the stop position. A switch is provided that is turned on by operating the upper or lower side of the lifting operation means, and when the upper or lower switch is turned on, the work equipment is raised or lowered, and the upper or lower relay is self-holding. By turning on the upper or lower side momentarily, the working machine continues to move up and down to the upper and lower stop positions of the detection mechanism selected based on the selection device, thereby eliminating the above-mentioned drawbacks. The purpose is to provide a device.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

As shown in FIG. 1, the combine 1 has a preprocessing section 3 in front of the main machine 2.

The pre-processing section 3 has a pre-processing section frame 5, a lifting claw 6, etc., and the frame is supported by a hydraulic cylinder device 8 about a pivot shaft 7 so as to be rotatable up and down.

In addition, a driver's seat 9 is arranged at the front of one side of the machine 2, and near the driver's seat 9, an elevating lever 10 and selection switches 11 and 12 constituting a selection device for the ascending side and descending side are arranged. has been done.

The lifting lever 10 is biased by a spring 13, 13 to return to the neutral position, and is provided with limit switches 15 and 16 on the lifting side and the lowering side, which are actuated by rotational operation.

On the other hand, the hydraulic cylinder device 8 is controlled by a control valve 20 operated by solenoids 17, 18 on the ascending side and descending side, and a member 8a on the pre-processing section side of the cylinder device 8.
A protrusion 21 is provided.

Further, a large number of limit switches 22u, 22a, 22 constituting a detection mechanism are installed on the main machine 2 side adjacent to the cylinder device 8.
b, 22c, and 22d are provided, and switches 22 and 22d are provided.
..., the normally closed circuit is cut off by contact with the protrusion 21.

As shown in FIG. 2, the circuit according to this embodiment consists of rising side and falling side circuits 23.
．． 25 includes a relay 26.27 operated by a limit switch 15.16 and a solenoid 17 of the control valve 20;
18 are intervening.

Further, the limit switches 15 and 16 are connected to upper and lower limit switches 22u and 22d, respectively, which operate at the most extended position and the most retracted position of the hydraulic cylinder device 8.

Relays 26 and 27 are solenoids 26a and 27a, respectively.
The switches 26b and 27b are self-held by energizing the solenoids 26a and 27a.

Furthermore, the switches 26b and 27b have contacts u, al, 9 bN C1 and a29 b29 C2 which are switched by the ascending side and descending side selection switches 11.12, respectively.
? d through a number of upper stop position limit switches 22u.

22a, 22b1, 22C, and the lower stop position limit switches 22a2, 22b2, 22C2, 22d.

Further, as shown in FIG. 3, the control valve 20 can be switched to send pressure oil from the hydraulic pump 28 to the hydraulic cylinder device 8 or to discharge oil in the cylinder device 8 to the oil tank 30. I can do it.

Note that 31 in the figure is a relief valve for releasing pressure oil from the hydraulic pump 2B.

Since the present embodiment has the above-described configuration, the selection switches 11 and 12 for the ascending side and descending side are set to appropriate positions depending on the field conditions during the combine harvesting operation.

That is, in the case of dry rice fields, the pretreatment section 3 can be lowered to its full extent because the aircraft does not sink much, and therefore the selection switch 1 on the lowering side can be lowered.
2 to contact d, select switch 11 on the rising side. Contact C1
Set to .

In this state, during reaping work, the lift lever 10 is momentarily rotated in the downward direction against the spring 13, and when the limit switch 16 is connected, the solenoid 27a of the relay 27 is energized, and the switch 27b is connected. Self-maintained in a state.

Therefore, let go of the lift lever 10 and release the spring 1.
3 returns the lift lever 10 to the neutral position and the current continues to flow even if the switch 16 is turned off.

At the same time, the solenoid 18 of the control valve 20 is also energized,
The oil in the hydraulic cylinder device 8 is discharged based on the weight of the pretreatment section 3 by operating the valve 20, and the pretreatment section 3 is lowered.

Along with this downward movement, the hydraulic cylinder device 8 contracts, and when its protrusion 21 contacts the downward limit switch 22d, the normally closed switch 22d is opened and the solenoid 18
When the excitation is cut off, the preprocessing section 3 stops at the lower limit position.

Note that by disconnecting the switch 22d, the energization to the solenoid 27a of the relay 27 is also disconnected, and the self-holding of the switch 27b is also released.

Further, when the combine harvester 1 is operated to turn, the elevating lever 10 is momentarily rotated in the upward direction.

As a result, the limit switch 15 on the rising side is connected,
The solenoid 17 of the control valve 20 is energized, and the solenoid 26a of the relay 26 is energized.

Due to this excitation, the switch 26b of the relay 26 is self-held, so even if the limit switch 15 is turned off, the solenoid 17 continues to be energized.

Thereby, the control valve 20 is controlled, pressure oil is sent to the hydraulic cylinder device 8, and the pretreatment section 3 is raised.

As the hydraulic cylinder device 8 expands, when the projection 21 contacts the limit switch 22C1, the normally closed switch 22
C1 is opened and the rise of the pre-processing section 3 is stopped at a relatively low position.

Therefore, the combine harvester 1 can be efficiently turned.

Further, when the combine harvester 1 works in a normal wet field, the selection switch 11 on the ascending side is set to the contact point C2, and the selection switch 12 on the descending side is set to the contact point C2.

When the elevator lever 10 is momentarily rotated in this state, the solenoid 17 or 18 of the control valve 20 is energized, and the switch 26b or 27 of the relay 26 or 27 is activated.
b is self-retained, the hydraulic cylinder device 8 expands or contracts until its protrusion 21 contacts the limit switch 22b□ or 22C2, and the preprocessing section 3 can move up and down within a predetermined range.

Furthermore, when working in ultra-humid fields, the pretreatment section 3 must be operated in the upper position because the machine sinks a lot. Therefore, the selection switch 11 on the ascending side is set to al, and the selection switch 12 on the descending side is set to al. , and the preprocessing section 3 can be raised and lowered from the upper position in the same manner as described above.

In this case, if the elevator lever 10 continues to be rotated in the upward or downward direction, the limit switch 15 or 1 will be activated.
6, the solenoid 17 or 18 of the control valve 20 continues to be energized, and the pretreatment continues until the upper or lower limit switch 22u or 22d is turned off by the protrusion 21, regardless of the setting position of the selection switch 11 or 12. The section 3 can be raised and lowered.

In addition, in the embodiment, limit switches 22a, 22b,
22 Use a double-pole, double-throw switch for c, and one limit switch has two contacts, so that the upward and downward sides operate simultaneously as shown by the dotted line, and the limit switches on the upward and downward sides are operated simultaneously. It goes without saying that separate limit switches may be provided on the ascending side and the descending side, although they are used for both purposes.

In addition, there are separate selection switches 11.1 for the ascending side and descending side.
2, however, the range of elevation of the pre-processing section 3 may be determined in advance to a predetermined range, and the movement may be performed using one selection switch.

As explained above, according to the present invention, the work equipment 3 such as the pre-processing section 3 is moved to a predetermined position arbitrarily selected by the selection devices 11 and 12 in advance by the instantaneous operation of the lifting/lowering operation means. Since the work equipment 3 is raised and lowered until it stops, it is easy to perform simultaneous operations such as raising and lowering the work implement 3 while turning, preventing erroneous operations and reducing driver fatigue.

In addition, the selection device 11.12 allows the raising and lowering position of the working machine 3 to be set according to the field conditions, making it easy to set the appropriate cutting height in any field, and also changing the raising position of the working machine 3. Since the machine is stopped at a height that does not interfere with the direction of the machine, there is no need to raise it all the way up, allowing for efficient work.

Furthermore, if the raising/lowering operating means 10 continues to be held in the upper or lower operating position, the upper or lower switch 15.16 will continue to be turned on, and the work implement 3 will remain in place regardless of the setting position selected by the selection device 11.12. Since the working machine 3 can be raised and lowered, it is possible to temporarily raise the working machine 3 significantly when going over a ridge or the like while the selection devices 11 and 12 are set at predetermined positions.

Furthermore, since the raising and lowering positions of the working equipment 3 are set based on the detection mechanism 22 that detects the relative position of the working equipment 3 with respect to the main machine 2, the height above the ground of the working equipment is detected based on the height sensor, and the work equipment is It is possible to prevent malfunctions caused by the relative ground height sensor that sets the lowering position of the aircraft from sticking into the soil, or from being bent or damaged when going backwards.
It is also possible to easily set the raised position of the working machine so as not to interfere with turning, etc.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing the front part of a combine harvester to which the present invention is applied, Fig. 2 is an electric circuit diagram according to the present invention, and Fig. 3
The figure is a hydraulic circuit diagram. 1... Mobile agricultural machinery (combiner), 2...
・This machine, 3... Work equipment (pre-processing section), 8...
... Lifting drive device (hydraulic cylinder device), 10...
... Lifting operation means (lifting lever), 11, 12...
... selection device (selection switch), 15 ... upper side (limit) switch, 16 ... lower side (limit) switch, 22 ... detection mechanism (switch), 26... Upper relay 27... Lower relay.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine in which the machine supports a work machine so as to be able to move up and down, a detection mechanism is provided to detect the relative position of the work machine with respect to the machine, and the upper and lower stopping positions of the detection mechanism are optionally selected. A device is installed to further bias/energize it to the stop position.
A switch is provided that is turned on by operating the upper or lower side of the lifting operation means held, and when the upper or lower switch is turned on, the work equipment is raised or lowered, and the upper or lower relay is self-maintained. The lifting device is configured such that the working machine continues to move up and down to the upper or lower stop position of the detection mechanism selected based on the selection device by momentary turning on of the upper or lower switch.