JPH0616647B2 - Hydraulic equipment for farm vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides a rolling hydraulic actuator for tilting a working unit to the left and right with respect to a traveling machine body, and sets the working unit to a ground posture. As described above, a rolling control mechanism for automatically operating the control valve of the rolling hydraulic actuator is provided, and one of the rolling hydraulic actuator and another hydraulic actuator other than this is selectively connected to the control valve, and The present invention relates to a hydraulic device for an agricultural vehicle provided with an operation target switching valve that locks the other.

[Conventional technology]

The farm work vehicle is configured such that another hydraulic actuator can be operated using the hydraulic oil and the control valve for rolling control of the working part by the operation of the operation target switching valve, and the common hydraulic system is used. It has an advantage that it can be realized.

As this type of farm work vehicle, for example, Japanese Patent Laid-Open No. 62-1002 has been used.
As shown in Japanese Patent Publication No. 03, the manual operation tool for switching the operation target switching valve and the operation tool for manually operating the control valve when operating the separate hydraulic actuator are separately provided. There was such inconvenience.

[Problems to be solved by the invention]

In other words, when operating the separate hydraulic actuator, the separate hydraulic actuator is connected to the control valve in place of the rolling hydraulic actuator, and the operation tool is operated for connection switching, and the separate hydraulic actuator is controlled to be driven. It took a lot of time and labor to operate both the operation tool and the operation tool for moving the valve to the drive position.

Further, since the operation of the operation target switching valve and the operation of the control valve are different operations, if the return operation of the operation target switching valve is forgotten after operating the operation by connecting another hydraulic actuator to the control valve, rolling will occur. There was also a risk of working without control.

The present invention has been made paying attention to such a point, and an object thereof is to easily and easily switch between a state in which another hydraulic actuator is operated and an original state in which the automatic rolling control of the working unit is performed. In addition, it is possible to avoid forgetting to return to the automatic rolling control state after operating the separate hydraulic actuator, and to perform the work under the appropriate automatic rolling control.

[Means for solving problems]

A characteristic configuration of the present invention is that the hydraulic system for an agricultural work vehicle described above is provided with an artificial operating tool for operating another hydraulic actuator, and when the artificial operating tool is not in an operating position for driving another hydraulic actuator, the hydraulic pressure for rolling is set. When the actuator is connected to the control valve, and the rolling control mechanism brings about an automatic control state in which the control valve is operated, and the manual operation tool is operated to the operation position for driving another hydraulic actuator, The separate hydraulic actuator is connected to the control valve, and the artificial operation tool is set to the operation target switching valve so that an artificial control state in which the control valve has a drive position in preference to the rolling control mechanism is brought about. It is linked to the control valve, and its action and effect are as follows.

[Work]

By operating the manual operation tool for operating the separate hydraulic actuator, the artificial control state is revealed, the separate hydraulic actuator is connected to the control valve, and the control valve takes the driving position in preference to the rolling control mechanism. This allows the separate hydraulic actuator to be driven arbitrarily.

Further, when the driving of the separate hydraulic actuator by the manual operation tool is stopped, the automatic control state is automatically displayed, and the automatic rolling control of the working section is performed.

〔The invention's effect〕

Therefore, according to the present invention, it is possible to easily operate the separate hydraulic actuator or to automatically control the rolling of the working unit by simply operating the manual operation tool for driving the separate hydraulic actuator. It has excellent operability.

Moreover, by operating this artificial operation tool to drive and stop another hydraulic actuator, it is now possible to satisfactorily perform the work in the automatic rolling control state without forgetting the return operation.

〔Example〕

As shown in FIG. 3, a lift cylinder is provided at the rear of the traveling body.
A pair of left and right lift arms (2a) and (2b) that can be swung up and down by (1) are connected to the rotary tiller (3) so that they can be swung up and down around the shaft core (P) to move up and down. The rotary tiller (3) is configured so that rotational power is transmitted from the traveling body to the rotary tiller (3), and the tiller (4) is attached to the rotary tiller (3).
Is attached to form a riding-type cultivator with a soil cultivator.

One of the pair of left and right lift arms (2a), (2b) and the main frame (3a) of the tiller are connected by the lift rod (5), and the other lift arm (2b) and the main frame of the tiller.
(3a) is connected by a rolling cylinder (6) so that the rolling cylinder (6) as an example of a hydraulic actuator for rolling can perform a lateral tilting operation with respect to the traveling machine body of the rotary tiller (3). Then, the gravity-type tilt sensor (7) attached to the rear part of the traveling machine body so as to detect the direction and the inclination angle of the lateral direction of the traveling machine body and to take out the detection result as an electric signal, and the rotary tiller.
The stroke sensor (3) attached to the rolling cylinder (6) detects the direction of left and right tilting with respect to the traveling machine body and the tilt angle based on the extension and contraction length of the rolling cylinder (6), and outputs the detection result as an electrical signal. 8) is linked to the operation circuit (11) of the control valve (10) of the rolling cylinder (6) via the rolling control mechanism (9) as shown in FIG. 1, regardless of the lateral inclination of the traveling mechanism. Instead, it is constructed so that the left and right tillage depths and the difference between the left and right tillage depths can be maintained while maintaining a substantially constant level. That is, the rolling control mechanism (9)
Is a control target stroke setting means (9a) for setting a control target stroke based on information from the inclination sensor (7) and the ground posture setting device (12) of the rotary tiller (3) to be maintained. A control means (9b) that automatically outputs a predetermined control valve operation signal to the control valve operation circuit (11) so that the target control stroke set by the stroke setting means (9a) and the value detected by the stroke sensor (8) match. ) Is configured by a microcomputer, and the control valve (10) is automatically operated so that the ground posture of the rotary tiller (3) becomes the posture set by the setter (12). .

As shown in FIG. 3, a grounding gauge wheel (13) for setting working depth is provided on the rear end side of the fermenter mounting frame (3b) of the rotary tiller (3) by means of the depth adjusting cylinder (19) to guide the guide tube. Install so that the height can be adjusted along (15), and use the cylinder (1
The work depth is adjusted by 4). That is, when the depth adjusting cylinder (14) is extended, the work is performed by allowing the lift cylinder (1) to freely expand and contract due to an external force, so that the depth adjusting cylinder (14) moves to the ground gauge wheel (3). The ground of the main frame (3a) and the earthenware mounting frame (3b) are used as the shaft center for the grounding of the
Since it swings up and down around (P), the working depth becomes shallower.If the depth adjustment cylinder (14) is shortened,
The mounting height of the grounding gauge wheel (13) to the fermenter mounting frame (3b) is increased to increase the rotary tiller (3) and the fertilizer (4).
Since the weight can be lowered around the shaft center (P), the working depth becomes deeper.

The depth adjusting cylinder (14) is based on the operating device shown in FIG. 1, and is based on the operating oil and control valve for the rolling cylinder (6).
It is configured to operate using (10).

That is, the first operation target switching valve is connected to each of the two oil passages (16a) and (16b) connecting the rolling cylinder (6) and the control valve (10).
(17) or the second operation target switching valve (18) is provided, and the depth control cylinder (14) is provided in these operation target switching valves (17), (18).
Are connected. That is, the first and second operation target switching valves
By means of (17) and (18), one of the rolling cylinder (6) and the depth adjusting cylinder (14) (6) or (14) is selectively connected to the control valve (10) and is not connected. The other cylinder on the side
(14) or (6) is locked. Then, as shown in FIG. 2, the first and second operation target switching valves (1
7), (18) operation circuit (19) and the control valve operation circuit (11)
By switching the first and second operation target switching valves
One cylinder operation switch (20) linked to each of (17), (18) and the control valve (10) is attached to one rear wheel fender (21), and operation of the cylinder operation switch (20) is performed. The first and second operation target switching valves (17), (18) and the control valve (10) are switched by a series of operations of the lever portion (20a).

More specifically, when the operating lever portion (20a) is operated to the first operating position (UP) by an artificial rocking operation, the first switch (20b) of the cylinder operating switch (20) is turned on and the second switch is turned on.
(20c) is turned off, the first relay switch (R ₁ ) is turned on, the first solenoid operated part (sol ₁ ) of the control valve (10), the solenoid operated part of the first operated switching valve (17) (sol ₃ ) and the electromagnetic operation part (sol ₄ ) of the second operation target switching valve (18) are energized and the second electromagnetic operation part (sol ₂ ) of the control valve (10) is controlled by the rolling control mechanism (9). Disables the energizing operation for the second
When the relay switch (R ₂ ) is turned off, the second electromagnetic operating unit
The depth adjustment cylinder (14) is connected to the control valve (10) by deenergizing the (sol ₂ ), and the control valve (10) has the first priority over the rolling control mechanism (9). Drive position
The first artificial control state of (u) appears, and the depth adjusting cylinder (14) extends. And the operation lever part (20a)
Is operated to the second operation position (DN), the first switch (20
When b) is turned off, the second switch part (20c) is turned on, and the first relay switch (R ₁ ) is turned off and the first electromagnetic operation part (sol ₁ ) is turned on.
De-energizing operation for the second relay switch
(R ₂ ) is turned on to energize the second electromagnetic operating unit (sol ₂ ) and the electromagnetic operating units (sol ₃ ) and (sol ₄ ), and the first electromagnetic operating unit by the rolling control mechanism (9). (sol ₁ )
The depth adjustment cylinder (14) is connected to the control valve (10) by disabling the energizing operation to the control valve (10), and the control valve (10) has priority over the rolling control mechanism (9) and the second drive position ( d)
The second artificial control state that becomes, the depth adjustment cylinder
(14) is shortened. When the operation lever portion (20a) is operated to the third operation position (AT), both the first switch portion (20b) and the second switch portion (20c) are turned off, and the first switch portion (20c) is turned off.
Both the relay switch (R ₁ ) and the second relay switch (R ₂ ) are turned off to de-energize the electromagnetic operating parts (sol ₃ ) and (sol ₄ ) and to control the rolling control mechanism.
(9) 1st electromagnetic operation part (sol ₁ ) and 2nd electromagnetic operation part (sol ₂ )
By enabling the energization operation and the de-energization operation with respect to the rolling cylinder (6) is connected to the control valve (10), the depth adjustment cylinder (14) is locked, and
An automatic control state in which the control valve (10) is operated by the rolling control mechanism (9) appears, the depth adjustment cylinder (14) is brought into a stopped state, and automatic rolling control is enabled.

Reference numeral (22) shown in FIG. 1 is a shunt valve that preferentially supplies a set amount of hydraulic oil from the hydraulic pump to the control valve (10) and supplies the remaining amount to the lift cylinder (1).

[Another embodiment]

Since the present invention can be applied to various agricultural work vehicles such as combine harvesters in addition to the cultivator, the rotary cultivating device (3) is installed in the working unit (3).
The depth adjusting cylinder (14) is referred to as another hydraulic actuator (14) other than the rolling hydraulic actuator.

The first and second operation target switching valves (17) and (18) may be implemented as an integrated valve. Then, this switching valve (17), (1
8) and control valve (10) to allow manual operation, control valve (10)
For electric, and operated switching valves (17), (18)
However, mechanically operated operating tools may be employed, which are collectively referred to as an artificial operating tool (20a).

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1 shows a hydraulic circuit diagram of an agricultural vehicle according to the present invention, FIG. 1 is a hydraulic circuit diagram, FIG. 2 is an electric circuit diagram, and FIG. 3 is a perspective view of a rear part of a tiller with a cultivator. (3) …… Working unit, (6) …… Rolling hydraulic actuator, (9) …… Rolling control mechanism, (10) …… Control valve, (1
4) …… Separate hydraulic actuator, (17), (18) …… Operation target switching valve, (20a) …… Human operated tool, (u), (d) …… Drive position.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-100203 (JP, A) JP-A-61-111603 (JP, A) Practical application Sho-57-20805 (JP, U)

Claims (1)

[Claims] 1. A rolling hydraulic actuator (6) for tilting a working part (3) left and right with respect to a traveling machine body is provided, and the rolling part is arranged such that the working part (3) has a ground posture. Valves for hydraulic actuators (6)
A rolling control mechanism (9) for automatically operating (10) is provided, and one of the rolling hydraulic actuator (6) and another hydraulic actuator (14) other than this is selectively provided to the control valve (10). A hydraulic system for an agricultural vehicle provided with operation target switching valves (17), (18) for connecting and locking the other, which is provided with an artificial operating tool (20a) for operating another hydraulic actuator (14), When the artificial operation tool (20a) is not in the operation position for driving another hydraulic actuator, the rolling hydraulic actuator (6) is connected to the control valve (10), and the rolling control mechanism (9) is used to When the automatic control state in which the control valve (10) is operated is brought about and the manual operation tool (20a) is operated to the operation position for driving another hydraulic actuator, the another hydraulic actuator (14) causes the control valve (14) to operate. 10) and is connected to the rolling control mechanism (9) Preferentially the control valve (10) driving position (u), (d)
The artificial operation tool (20a) is operated by the operation target switching valves (17), (18).
And a hydraulic system for an agricultural vehicle linked to the control valve (10).