JPH033122Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lowering control device for a work machine in a work traveling machine such as a combine harvester, an agricultural tractor, or a rice transplanter.

[Problems to be solved by the prior art and the invention]

Conventionally, in this type of work traveling machine, the working machine, which is provided on the traveling machine so as to be able to rise and fall freely, can be lowered even when not in operation by lowering an elevator lever. For this reason, for example, during inspection and maintenance or while driving on the road, if your hand accidentally touches the lift lever and the lever moves to the lowered position, the work equipment will inadvertently lower. There were drawbacks, such as causing serious harm to workers hiding inside, and causing damage to the work equipment by causing it to collide with the road surface. However, if the work equipment cannot be lowered at all when it is not in operation, it will cause problems in inspection and maintenance, etc.Therefore, some models are equipped with a lock mechanism that restricts the lowering of the work equipment. Since the locking mechanism must be switched each time the locking mechanism is switched between operating and non-operating states, the operation becomes complicated and troublesome, and there are still problems such as forgetting to operate the locking mechanism.

[Means and actions to solve the problem]

In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a lowering control device for a work machine in a work traveling machine that can eliminate these drawbacks. A lowering control circuit mechanism for a working machine configured to lower the working machine by a lowering operation is provided with a detection switch and a release switch for detecting the non-operating state of the working machine. The present invention is characterized in that the lowering of the work implement by means of a lift lever is restricted upon detection of non-operation of the work implement, and the work implement is lowered by additional operation of a release switch.

With this configuration, the present invention automatically restricts the lowering of the work equipment when the power transmission is cut off and the work equipment becomes inactive, and if necessary, The working machine can be lowered by operating the release switch, which is extremely superior in terms of operability and safety.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes a traveling body of a combine harvester, and in front of the traveling body 1 are links 2,
A pre-processing section 4, which is an example of a work machine, is attached via a rotating connection section 2a and 3, 3a, and is adapted to move up and down by the expansion and contraction operation of a hydraulic cylinder 5, which will be described later. The oil passage to the hydraulic cylinder 5 is provided with a hydraulic valve 7 which is switched by operating the lift lever 6, and a check valve 8 equipped with a solenoid S1 to be described later. When the lift lever 6 is operated from the neutral position N to the raised position U, the hydraulic cylinder 5 is operated by the hydraulic oil sent via the hydraulic valve 7 and the check valve 8 by the operation of the hydraulic pump 9. When the pre-processing section 4 is extended and the pre-processing section 4 is raised, and the lifting lever 6 is operated from the neutral position N to the lowering position D, the solenoid S1 is activated and the check valve 8 is switched, as will be described later. At this point, the hydraulic cylinder 5 is contracted to lower the pretreatment section 4. Reference numeral 10 is a height detector connected in conjunction with the rotary connection portion, and reference numeral 11 is a height setting device provided on the control panel 1a, and these are mainly composed of potentiometers. The resistance value VR2 of the height detector 10 changes in accordance with the height of the pre-processing section 4, and the height setter 11 can set the resistance value VR1 in advance. Further, a changeover switch SW1 is provided at the base of the elevator lever 6 so as to be closed when the elevator lever 6 is operated to the lowered position D, and a release switch SW3 is provided at the upper end of the elevator lever 6. Furthermore, a preprocessing part lever (work equipment clutch lever) 12 that interrupts power transmission from the traveling machine body 1 side to the preprocessing part 4 is closed when detecting a power cut state, that is, a non-operating state of the preprocessing part 4. A detection switch SW2 is provided to detect these detectors 1.
0, 11 and switches SW1-3, solenoid S
1 and the like constitute a descending control circuit mechanism shown in FIG.

That is, when the pre-processing section lever 12 is operated to the power-on state, the detection switch SW2 is opened, and in this state, the height output based on the actual height of the pre-processing section 4 is The output voltage _e2 from the detector 10 and the output voltage _e1 set in advance by the height setting device 11 to be the lowering limit of the pre-processing section 4.
is compared by the comparator circuit CONP, and if the preprocessing section 4 is located at a higher position than the lowering limit position set above, the height detection value is higher than the output voltage e ₁ from the height setting device 11 side. The output voltage e ₂ from the device 10 side is large (e ₁ < e ₂ ), and in this state, the comparator circuit COMP
Therefore, the base voltage is not applied to the transistor Tr1 side. Therefore, when the lift lever 6 is operated to the lower position D, the changeover switch SW1 is closed and the base voltage is applied to the transistor Tr2, which activates the solenoid S1 and switches the check valve 8, causing the hydraulic cylinder 5 to contract. Then, the preprocessing section 4 descends. Then, the output voltage e ₂ from the height detector 10 is the output voltage e ₁ from the height setting device 11 side.
(e ₁ > e ₂ ), the comparator circuit COMP
The base voltage is applied to transistors Tr1 and Tr3 from
On the side, the pilot lamp L lights up to notify that the preprocessing section 4 has been lowered to the set position, and the transistor Tr1 becomes conductive.
The base voltage of Tr2 becomes 0, and as a result, the solenoid S1 is no longer energized, and the check valve 8
returns to its original state, and the preprocessing section 4 returns to the height setting device 11.
It is designed to stop at a preset lowering position.

On the other hand, when the pre-processing section lever 12 is operated to turn off the power, the switch SW2 is closed in this embodiment and the height detector 10 side circuit is grounded. The side output voltage e ₂ becomes 0 regardless of the position of the preprocessing section 4. For this reason always
e ₁ > e ₂ , so in this case, the base voltage is applied to the transistor Tr1, and as mentioned above,
No matter how much the lift lever 6 is operated to the lowered position D, the lowering of the pre-processing section 4 is completely restricted. However, even when the detection switch SW2 is in the closed state, if the release switch SW3 is closed,
The solenoid S1 is energized to operate the check valve 8 regardless of the switches SW1 and SW2, so that the preprocessing section 4 can be lowered.

In the embodiment of the present invention configured as described above, when reaping and threshing work is to be performed in the field, the lifting lever 6 is lowered with the pre-processing part 4 in the operating state with the pre-processing part lever 12 in the powered state. When the switch is operated to position D, as described above, in this state, the changeover switch SW1 is closed and the detection switch SW2 is opened, so that the height setter 11 and the height detector 10 are controlled by the comparison circuit COMP. The preprocessing section 4 can be lowered to a preset lowering position by comparing the respective output voltages e ₁ and e ₂ from and . Therefore, the pretreatment section 4 can be positioned at a desired height to perform the reaping operation. When the machine is to be rotated, if the lift lever 6 is operated to the raised position U, the hydraulic cylinder 5 is extended and the pre-processing section 4 is raised, allowing field work to be carried out.

As described above, in the present invention, while the pretreatment section 4 is in operation, the pretreatment section 4 can be raised and lowered by operating the lift lever 6 to perform work in the field. 4 is not in operation, even if the elevator lever 6 is erroneously operated to the lowered position D, there is no possibility that the preprocessing section 4 will be inadvertently lowered in the present invention. That is, in this embodiment, as described above, when the pretreatment section lever 12 is turned off so that the pretreatment section 4 is inactive, the detection switch SW2 that detects this closes and the height detector is turned off. The circuit on the 10 side is grounded, and the output voltage e ₂ on the height detector 10 side becomes 0. For this reason, the comparison circuit COMP
Then, as a result of always comparing the voltage e ₂ > e ₁ , the base voltage of the transistor Tr2 becomes 0 as mentioned above.
It's getting old. Therefore, even if the temporary lift lever 6 is operated to the lowered position D and the changeover switch SW1 is closed, the solenoid S will not be energized. As a result, even if the elevating lever 6 is erroneously moved to the lower position D by touching it with a hand while traveling on the road or during inspection and maintenance of the pre-processing section 4, the pre-processing section 4 will not be lowered at all. On the other hand, if you want to lower the pretreatment section 4 for inspection and maintenance in this state,
The operator presses the release switch provided on the lift lever 6.
If the SW 3 is separately operated and closed, the solenoid S is activated, the check valve 8 is switched, and the pre-processing section 4 is quickly lowered.

In this way, in the present invention, if the pre-processing section 4 is put into the non-operating state, the pre-processing section 4 is no longer activated by the lifting lever 6.
It will never be lowered by operating the release switch SW3, and will only be lowered by operating the release switch SW3. Moreover, once the preprocessing section 4 is activated, the preprocessing section 4 can be controlled to descend again by operating the lift lever 6. Therefore, the preprocessing section 4 can be operated by switching the preprocessing section 4 between non-operation and operation using the preprocessing section lever 12, without requiring complicated and troublesome operations such as releasing the lock mechanism as in the past. It is possible to automatically switch between lowering regulation and raising/lowering control when not in operation, and the lowering of the pre-processing section 4 when not in operation can be done by pressing a release switch.
This can be done only by conscious additional operation of SW3, resulting in extremely high safety and operability.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and for example, the eighth embodiment may be used to restrict the lowering of the pre-processing section 4 (working machine) when the pre-processing section 4 is inactive. This can also be achieved by what is shown in the figure. That is, in this device, a detection switch SW2 is provided in the circuit on the side of the height setting device 11, and when the work equipment is put into operation, the switch contact a becomes conductive to control the elevation while the work equipment is in operation. However, when the work machine is put in a non-operating state, the switch contact b is electrically connected. In this case, the comparator circuit COMP uses the output voltage from the variable resistor R instead of the height setting device 11.
e ₁ will be compared with the output voltage e ₂ from the height detector 10 side. Therefore, if the value of the safe lowering height is set in advance using the variable resistor R, when the lifting lever 6 is operated to the lowering position D when the working equipment is not in operation, the working equipment will move to the safe lowering height set above. This is convenient because the machine is lowered to a higher position and further lowering is restricted, which prevents work from touching the ground when the machine is moving.

〔effect〕

In summary, since the present invention is constructed as described above, when the work machine is not in operation,
The automatic detection operation of the detection switch ensures that the lowering of the work equipment is regulated even if the lift lever is operated to the lowered position. Therefore, the worker can automatically control the lowering of the work equipment by switching between activation and deactivation of the work equipment, without having to perform complicated and troublesome operations such as switching the lock mechanism as in the past. In addition, if you want to lower the implement when it is not operating, you will have to consciously operate the release switch to lower it. It can reliably prevent working equipment from accidentally descending and colliding with the road surface, resulting in damage or injury to workers, improving not only operability but also safety. It can also be made extremely superior.

[Brief explanation of drawings]

The drawings show an embodiment of a lowering control device for a working machine in a working traveling machine according to the present invention, in which Fig. 1 is a schematic side view of a combine harvester, Fig. 2 is a hydraulic system diagram, and Fig. 3 is a diagram showing a hydraulic system diagram. is a plan view of the lift lever section,
Figure 4 is a side view of the same as above, Figure 5 is a front view of the detection switch section, Figure 6 is a side view of the same as above, Figure 7 is a circuit diagram of the lowering control circuit mechanism, and Figure 8 is a lowering control circuit showing another example. FIG. 3 is a circuit diagram of the mechanism. In the figure, 4 is a pre-processing unit (working machine), 6 is a lift lever, SW1 is a changeover switch, SW2 is a detection switch, and SW3 is a release switch.

Claims (1)

[Scope of utility model registration request] A lowering control circuit mechanism for a working machine configured to lower the working machine by a lowering operation of a lift lever is provided with a detection switch and a release switch for detecting a non-operating state of the working machine, so that the lowering control circuit mechanism detects A working machine in a work traveling machine, characterized in that a switch detects that the working machine is not in operation to restrict the descending of the working machine by a lift lever, and the working machine is lowered by additional operation of a release switch. descent control device.