JPH0444014Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a check device for hydraulic levers in mobile agricultural machines such as rice transplanters, fertilizers, and seeding machines.

[Problems to be solved by the prior art and the invention] In general, in this type of mobile agricultural machinery, during transportation,
Or, in order to keep the working part locked in the raised state when driving on the road, etc., the oil passage is between a hydraulic valve that is switched by operating a hydraulic lever and a hydraulic cylinder that raises and lowers the working part based on the switching of the hydraulic valve. A stopper valve is provided at the holder, and the stopper valve is switched to a closed state to prevent the working part from being inadvertently lowered.

During work, it is necessary to open the stopper valve so that the work part can be raised and lowered. However, in the past, the opening/closing operating lever that switches the opening/closing of the stopper valve was provided independently of the hydraulic lever, so the opening/closing operating lever was left in the half-open position, and the hydraulic lever of the hydraulic valve was operated in this state. In this case, the hydraulic operation becomes incomplete and the working part cannot move up and down quickly, and problems such as insufficient upward thrust and abnormal rise in oil temperature occur. There is a problem with this drawback.

[Means for solving the problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a check device for a hydraulic lever in a mobile agricultural machine that can eliminate these drawbacks. A stopper valve is provided in the oil passage between a hydraulic valve that is switched by operating a hydraulic lever and a hydraulic cylinder that raises and lowers the working part based on the switching of the hydraulic valve, and the stopper valve is switched to a closed position. In a mobile agricultural machine configured to lock the lifting and lowering of the working part with The half-open operating region between the closed position and the closed position is connected to the operating path of the hydraulic lever so that it is located within the operating path of the hydraulic lever. It is characterized by being configured so as to keep it in check.

With this configuration, the present invention prevents the operation of the hydraulic lever from becoming incomplete when the stopper valve is in a half-open state. be.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a traveling body of a riding-type rice transplanter, and a planting section 2 is attached to the rear of the traveling body 1 so as to be able to rise and fall freely via an elevating link mechanism 3. A lift hydraulic lever 5 is disposed on the side of the driver's seat 4. This lifting hydraulic lever 5 is fixed at a fixed position S with the support shaft 5a as a fulcrum.
Rear up position U, front down (automatic) position D,
Further, a lever can be operated to move to the automatic planting position P in the front, and a control cam 7 is integrally provided at the base of the lifting hydraulic lever 5. This control cam 7 is interlocked and connected to a hydraulic valve 10, which will be described later, via a connecting rod 6. By operating the lifting hydraulic lever 5, the hydraulic valve 10 is switched and the hydraulic cylinder 12 is switched.
expands and contracts to move the planting section 2 up and down.

Cam surface of the control cam 7 (periphery of the control cam 7)
rollers 8a and 9a provided on the planting clutch arm 8 and the control arm 9 are brought into contact with each other. In the range of S and lowering position D, the roller 8a is in contact with the arc-shaped cam surface 7a, and in this state it is controlled to the cutting state, but when it is operated to the automatic planting position P, the cam It is adapted to be immersed in the groove 7b and oscillate to the engaged state, and in this way, the planting clutch can be turned on and off using the lifting hydraulic lever 5.

On the other hand, when the control arm 9 is operated to the fixed position S, the roller 9a is in contact with the substantially flat cam surface 7c, but when it is operated to the raised position U, the roller 9a is in contact with the substantially flat cam surface 7c. When the roller 9a is inserted into the cam groove 7b and is operated to the lowered position D, the roller 9a is inserted into the second cam groove 7d provided on the opposite side to the cam groove 7b, and further moved to the automatic planting position P. When the roller 9a is operated up to this point, the roller 9a goes beyond the second cam groove 7d and enters the outer third cam groove 7e. Even if the lever can be operated, the lifting hydraulic lever 5 can be operated in a click-like manner, and the control roller 9a is recessed into the second cam groove 7d, especially when operating from the lowering position D to the automatic planting position P. As a result, they are operated in a state where they are once subjected to resistance, and are configured so that they can be distinguished.

On the other hand, reference numeral 11 denotes a stopper valve provided in the oil passage leading from the hydraulic valve 10 to the hydraulic cylinder 12, and an opening/closing operating lever 13 for opening and closing the stopper valve 11 is connected to the lifting hydraulic lever 5 via an operating rod 13a.
It is placed on the side of the. The stopper valve 11 is switched between opening and closing by swinging the opening/closing lever 13, but the operating locus of the opening/closing lever 13 is similar to that of the lifting hydraulic lever 5.
The operator is forced into the operating path of the operator. In other words, the open and close positions of the opening/closing operating lever 13 are set to be located just outside the lever operation path of the lifting hydraulic lever 5 (the open position is on the raised position U side), but In the half-open operating region in which the stopper valve 11 is in a half-open state between the position and the closed position, the opening/closing operating lever 13 is located within the lever operating path of the lifting hydraulic lever 5, and the opening/closing operating lever 13 located in this position allows The lever operation of the lifting hydraulic lever 5 is checked.

In the embodiment of the present invention configured as described above, the hydraulic valve 10 is switched by lever operation of the lifting hydraulic lever 5, and the planting clutch is also switched, so that the planting section 2 can be moved up and down, and automatically. Although it is possible to carry out the planting operation, the lever operation of this lifting hydraulic lever 5 is as follows.
This cannot be done unless the opening/closing lever 13 is in the open state.

That is, in this device, when the opening/closing operating lever 13 is in the half-open operating region and the stopper valve 11 is in the non-open state, the opening/closing operating lever 13 is located within the operating path of the lifting hydraulic pressure lever 5, and the lifting hydraulic pressure is This obstructs the lever operation of the lever 5, thereby restraining the lever operation of the lifting hydraulic lever 5, and makes the operator aware that the stopper valve 11 is in a half-open state. As a result, the operator has to operate the opening/closing actuation lever 13 to the open position, and the problem of hydraulically operating the stopper valve 11 without realizing it while the stopper valve 11 is in the half-open state is prevented. Hydraulic operation is reliably performed in the open state, and problems such as insufficient upward thrust and abnormal rise in oil temperature can be prevented from occurring.

Moreover, in this way, when the stopper valve 11 is in the half-open state, the member that checks the lever operation of the lifting hydraulic lever 5 is the opening/closing operating lever 13 itself that switches the opening/closing of the stopper valve 11. Since it can be effectively used as a restraining member for the lever 6, it can contribute to the dual use of parts and to the simplification of the structure.

Moreover, in this case, since the lifting operation direction of the lift hydraulic lever 5 and the closing operation direction of the opening/closing operation lever 13 are the same, the lever operation when locking the working part 2 in the raised state is in the same direction, resulting in an operation error. This is convenient because it has the advantage of reducing the

In addition, in the embodiment, when operating the lifting hydraulic lever 5, the control cam 7 is used, and the planting clutch arm 8 and the control arm 9, which are in contact with the cam surface of the control cam 7, control the lifting hydraulic lever. Even if 5 is operated in a straight line, the operating positions of the up position U, the down position D, and the automatic planting position P are clear, so there are no operational mistakes and the lever can be operated reliably. It's convenient.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and it goes without saying that the open position and the closed position of the opening/closing operating lever may be in a relationship opposite to that of the embodiments.

[Operation and Effect] In summary, the present invention is constructed as described above, and a stopper valve is provided between the hydraulic valve and the hydraulic cylinder, and the stopper valve is closed to lock the lifting and lowering of the working part. However, the opening/closing operating lever that switches the stopper valve open and close is located within the operating path of the hydraulic lever when the stopper valve is in the half-open state. It will make you realize that. Therefore, by prompting the worker to operate the opening/closing lever to the open position, it is possible to prevent the hydraulic operation from being performed in an incomplete state where the stopper valve is in the half-open state. The vertical movement is smooth, and problems such as a lack of upward thrust and an abnormal rise in oil temperature can be prevented.

Moreover, since the thing that checks the lever operation of the hydraulic lever when the stopper valve is in a half-open state is the opening/closing operating lever itself that switches the opening/closing of the stopper valve, the opening/closing operating lever can be effectively used as a checking member for the hydraulic lever. As a result, it is possible to contribute to the simplification of the structure as well as the dual use of parts.

[Brief explanation of the drawing]

The drawing shows an embodiment of the hydraulic lever check device for a mobile agricultural machine according to the present invention,
Fig. 1 is an overall side view of the riding rice transplanter, Fig. 2 is a side view of the main parts of the hydraulic lever operation section, Fig. 3 is an explanatory diagram of the same operation, Fig. 4 is a front view of the main parts of the hydraulic lever part, FIG. 5 is an explanatory diagram of the operation seen from above, and FIG. 6 is a hydraulic circuit diagram. In the figure, 1 is a traveling machine body, 2 is a working part, 5 is an elevation hydraulic lever, 10 is a hydraulic valve, 11 is a stopper valve, 12 is a hydraulic cylinder, and 13 is an opening/closing operating lever.

Claims (1)

[Scope of utility model registration request] A stopper valve is provided in the oil passage between a hydraulic valve that is switched by operating a hydraulic lever and a hydraulic cylinder that raises and lowers the working part based on the switching of the hydraulic valve, and by switching the stopper valve to the closed position, the working part can be closed. In a mobile agricultural machine configured to lock the lifting/lowering operation, the opening/closing operation lever for switching the opening/closing of the stopper valve is arranged so that its open and closed positions are out of the operation path of the hydraulic lever, and the opening and closing operation levers are set in the open and closed positions. The half-open operation area between is arranged so as to be located within the operation path of the hydraulic lever and connected to the operation path of the hydraulic lever, and the lever operation of the hydraulic lever when the stopper valve is in the half-open state is checked by the opening/closing operation lever. A hydraulic lever check device for a mobile agricultural machine, characterized in that it is configured as follows.