JPS6322810Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a working machine lifting device for mobile agricultural machinery,
In particular, the present invention relates to a preprocessing section elevating device in a combine harvester, and more particularly to a work equipment elevating device that allows setting of a lowering position and an ascending position of the working equipment.

Conventionally, in order to regulate the lowering position of the pre-processing part, a ground sensing sensor is installed in the pre-processing part, and the lowering of the pre-processing part is stopped when the sensor touches the ground. However, with devices using ground-sensing sensors, there is a risk that the sensor may stick into the soil, or that the sensor may be bent or damaged when reversing, or that it may become clogged with mud, straw, garbage, etc., and become inoperable. There were flaws.

In addition, in order to raise the pre-processing section, an upper limit switch is provided, and by operating a lift lever, etc.
The pre-processing section is rising until the limit switch is turned off. Therefore, regardless of the field situation, the pre-processing section rises to the highest position, so it takes time to raise and lower the pre-processing section, reducing work efficiency when turning a combine harvester or the like.

Therefore, the present invention provides a mobile agricultural machine in which a machine body having a driver's seat supports a working machine so as to be able to be raised and lowered by a hydraulic system, in which a lift lever for operating the hydraulic system is installed near the driver's seat, and a lift lever that operates the hydraulic system is installed near the driver's seat. A detection mechanism for detecting the relative position with respect to the work equipment is installed, and the lowering and raising of the work equipment is stopped by the detection of the detection mechanism, and a detection mechanism for stopping the lowering of the work equipment is installed near the driver's seat. A lowering side setting device for setting the operating position of the working machine and a rising side setting device for setting the operating position of the detection mechanism for stopping the lifting of the work equipment are provided, and the lowering of the working equipment by the lift lever is controlled by the lowering side setting device. It is characterized by stopping at the operating position of the detection mechanism set by the device, and stopping the lifting of the work implement by the lifting lever at the operating position of the detection mechanism set by the lifting side setting device. It is an object of the present invention to provide a work machine lifting device which eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the combine 1 has a fuselage 2
It has a pre-processing section 3 in front of it. The pretreatment section 3 has a pretreatment section frame 5, a lifting claw 6, etc., and the frame 5 is supported by a hydraulic cylinder device 8 about a pivot shaft 7 so as to be rotatable up and down.
Further, a driver's seat 9 is arranged in the front part of one side of the aircraft body 2, and near the driver's seat 9, an elevating lever 10 and setting switches 11 and 12 constituting a setting device for the ascending side and descending side are arranged. ing. The lift lever 10 is biased by springs 13, 13 so as to return to the neutral position, and limit switches 1 on the rise side and the fall side are operated by the rotation of the lift lever 10.
5 and 16 are provided. On the other hand, the hydraulic cylinder device 8 constituting the hydraulic system is controlled by a control valve 20 operated by solenoids 17 and 19 on the ascending side and descending side, and a protrusion 21 is provided on the member 8a of the cylinder device 8 on the pre-processing section side. It is provided. Further, a large number of limit switches 22u, 22a, 22b, 22 which together with the protrusion 21 constitute a detection mechanism are provided on the body 2 side adjacent to the cylinder device 8.
The normally closed circuit of the switches 22 . . . is cut off by contact with the protrusion 21 .

The circuit according to this embodiment, as shown in FIG. Solenoids 17, 19 of control valve 20 are interposed. Further, the limit switches 15 and 16 are limit switches 22u and 2 that operate at the most extended position and the most retracted position of the hydraulic cylinder device 8, respectively.
Connected to 2d. The relays 26 and 27 have solenoids 26a and 27a, respectively, and when the solenoids 26a and 27a are energized, the switch 2 is turned on.
6b and 27b are self-held. Furthermore, the switches 26b and 27b are connected to a large number of limit switches via contacts u, a ₁ , b ₁ , c ₁ and a ₂ , b ₂ , c ₂ , d, which are switched by the setting switches 11 and 12 on the rising side and the falling side, respectively. 22u, 22a ₁ , 22b ₁ , 2
It is connected to 2c ₁ and 22a ₂ , 22b ₂ , 22c ₂ , and 22d. Further, as shown in FIG. 3, the control valve 20 can be switched to send pressure oil from the hydraulic pump 29 to the hydraulic cylinder device 8 or to discharge oil in the cylinder device 8 to the oil tank 30. I can do it. In addition, 31 in the figure is the hydraulic pump 2.
8 is a relief valve for releasing pressure oil.

Since the present embodiment has the above-mentioned configuration, the setting switches 11 and 12 on the ascending side and descending side are set to appropriate positions according to the field conditions during the combine harvesting operation. For example, in the case of dry rice fields, the pretreatment section 3 can be lowered to its full extent because the machine body 2 does not sink much, and therefore the setting switch 12 on the lowering side is set to the contact point d.
Then, the setting switch 11 on the rising side is set to contact _c1 , that is, the operating position of the detection mechanism is set. In this state, during reaping work, the lift lever 10 is rotated in the downward direction against the spring 13, and the limit switch 16 is
When connected, solenoid 2 of relay 27
7a is energized, and switch 27b is self-maintained in the connected state. Therefore, even if the lift lever 10 is released from the lift lever 10 and the spring 13 returns the lift lever 10 to the neutral position, and the switch 16 is turned off, current flows through the contact d of the switch 12. At the same time, the solenoid 19 of the control valve 20 is also energized, and the valve 20 is operated to discharge the oil in the hydraulic cylinder device 8 based on the weight of the pretreatment section 3.
The pre-processing 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 excitation of the solenoid 18 is cut off, so that the pretreatment section 3 is moved to the lower limit. At the same time, the relay 27's solenoid 27a is deenergized, and the self-holding of the switch 27b is also released. Further, when the combine harvester 1 is operated to turn, the elevator lever 10 is rotated in the upward direction. This connects the limit switch 15 on the rising side, energizing the solenoid 17 of the control valve 20 and energizing the solenoid 26a of the relay 26.
Due to this excitation, the switch 26b of the relay 26 is self-retained, 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. When the projection 21 comes into contact with the limit switch 22c ₁ as the hydraulic cylinder device 8 expands, the normally closed switch 22c ₁ is opened and the preprocessing section 3 stops rising at a relatively low position. Therefore, the combine harvester 1 can be turned around efficiently. Further, when the combine harvester 1 is used to work in a normal wet field, the setting switch 11 on the rising side is set to the contact point _b1 , and the setting switch 12 on the descending side is set to the contact point _c2 . When the lift lever 10 is rotated in this state, the solenoid 17 or 19 of the control valve 20 is energized, and the relay 2
Switch 26b or 27b of 6 or 27 is self-held, and the protrusion 21 of the hydraulic cylinder device 8 is a limit switch 22b ₁ or 22c ₂ respectively.
The pre-processing section 3 can be moved up and down within a predetermined range. Furthermore, when working in ultra-humid fields, the machine body sinks a lot, so the pre-processing section 3 must be operated in an upward position.
Therefore, by setting the setting switch 11 on the ascending side to a ₁ and setting the setting switch 12 on the descending side to b ₂ , the preprocessing section 3 can be raised and lowered from the upper position in the same manner as described above.

As explained above, according to the present invention, the aircraft 2
and a detection mechanism 2 that detects the relative position of the work equipment 3.
1, 22... are installed so as to stop the descending of the work equipment by the detection of the detection mechanism, and the lowering side sets the operating position of the detection mechanism for stopping the descent of the work equipment near the driver's seat 9. Since the setting device 12 is arranged to set the lowering position of the work equipment, there is no need for a ground sensing sensor, and therefore, there is no need for a ground sensing sensor, and therefore there is no need for the sensor to be damaged, bent, or clogged due to the installation of the sensor. Malfunctions can be prevented, the lower limit position of the work machine can be adjusted easily and reliably, and furthermore, the lower limit position of the work machine can be adjusted while sitting in the driver's seat 9 even during work. , safety and work efficiency can be improved, and the operational burden on the operator can be significantly reduced.

In addition, a rising side setting device 11 is provided to set the operating position of the detection mechanism that stops the lifting of the working machine.
Since the structure allows the lifting position of the working equipment to be set, the lifting position of the working equipment can be stopped at the optimal position depending on the field, reducing the time taken to raise and lower the working equipment when turning the equipment, and improving work efficiency. Efficiency can be improved. Furthermore, depending on the field conditions, crop conditions, etc., it is sufficient to set the descending side and ascending side setting devices 12, 11 once, and in normal work, just by operating the lift lever 10, the descending position and the ascending position can be set according to the field. The working machine 3 is automatically raised and lowered to the raised position, and there is no need to manually adjust the setting position using a scale, etc., which greatly simplifies the operation and improves work efficiency.

[Brief explanation of drawings]

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 thereof, and FIG. 3 is a hydraulic circuit diagram thereof. 1... Mobile agricultural machine (combiner), 2... Aircraft,
3... Work equipment (pre-processing section), 8... Hydraulic system (hydraulic cylinder device), 9... Driver's seat, 10... Lifting lever, 11... Rising side setting device (rising side setting switch), 12... ... Descending side setting device (descending side setting switch), 21, 22... Detection mechanism (protrusion/switch).

Claims (1)

[Scope of Claim for Utility Model Registration] A mobile agricultural machine comprising a machine body having a driver's seat and supporting a working machine so as to be able to be raised and lowered by a hydraulic device, in which a lifting lever for operating the hydraulic device is installed near the driver's seat, and A detection mechanism that detects the relative position of the machine body and the work equipment is installed, and the lowering and raising of the work equipment is stopped by the detection by the detection mechanism, and the lowering of the work equipment is stopped near the driver's seat. A descending side setting device for setting the operating position of the detection mechanism and a rising side setting device for setting the operating position of the detecting mechanism for stopping the lifting of the work equipment are provided, and the lowering of the working equipment by the lift lever is controlled by the lowering side setting device. It is characterized by stopping at the operating position of the detection mechanism set by the side setting device, and stopping the lifting of the work implement by the lifting lever at the operating position of the detection mechanism set by the rising side setting device. Work equipment lifting device.