JPS6222502A - Lifting/falling control mechanism of agricultural tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a ground work device that can be raised and lowered freely with respect to a vehicle body via a hydraulic lifting mechanism! ) and position control to raise and lower the ground work equipment to a predetermined level relative to the single unit, and ground work! ! Agricultural use equipped with a hydraulic valve dedicated to position control and a dedicated operating lever, and a hydraulic valve dedicated to draft control and a dedicated operating lever, so that draft control can be performed to raise and lower the shaft to maintain a predetermined leather load. Relating to tractor lifting system (81 mechanism).

[Conventional technology]

Traditionally, raising and lowering agricultural tractors! In addition to the above one control, the IJ@ mechanism is configured to operate a dedicated hydraulic valve using the swinging force of the swinging rear cover of the rotary tiller to maintain a constant plowing depth of the rotary tiller. There is (
(References not listed).

In addition, in this way, control to maintain the plowing depth constant (hereinafter referred to as automatic control)
(referred to as J plowing depth control) usually includes a dedicated hydraulic valve and an operation for setting the plowing depth.

[Problem that the invention seeks to solve]

Therefore, when trying to construct a lifting control mechanism that can perform three types of control: position control, draft control, and self-plowing depth control, operating tools such as a dedicated hydraulic valve and a dedicated operating lever must be installed in a variety of ways. This will be the case.

An object of the present invention is to rationally modify an elevator control mechanism configured to enable position control and draft control, such as the elevator control mechanism for agricultural tractors with the above configuration, and to increase the number of hydraulic valves and operations. It is possible to control the plowing depth on your own without having to do so.

[Means for Solving the Problems] A feature of the present invention is that the lift control mechanism having the above configuration is provided with a link mechanism whose reference position changes by operating the draft control operation lever. and the hydraulic valve for position control, and a mechanical plowing depth detection mechanism provided in the ground working device and the link mechanism are interlocked, and the link mechanism No. 11 is connected from the plowing depth detection mechanism. The present invention is configured such that the hydraulic valve for position control is operated by the force transmitted through the hydraulic valve to control the automatic vJ plowing depth of the ground working device, and its functions and effects are as follows.

[For production]

For example, when performing deep control with the above-mentioned configuration as shown in Fig. 1, the feedback rod end for draft control is pushed in and fixed suddenly, and the position levers Q and After setting it to the lowest position, if you operate the draft lever (lη),
The oscillating axis of the crank-shaped mechanism pivotally attached to the oscillating arm is displaced, and the axial center can be set arbitrarily.

When the position of the link mechanism is determined in this way, the operating force due to the swing of opening the rear cover of the tilling device (AR), which is transmitted to one end side of the link mechanism 1311 as shown in FIG. By swinging the link mechanism C0 and operating the position hydraulic valve u<r from the other end side of the link mechanism U via the link 4, the working station (A) is moved from the 74- With great control! It is possible to lower the value by j+.

Incidentally, when the draft lever (17) is operated in the 1-deep direction, the swing arm swings in the direction (De).

At this time, since the distance to the link mechanism connection point of the feedback operation system in the state where the link mechanism is connected is constant, the swing arm c29)! When M is made, the link mechanism (section) is cut in the direction (E), and the end of the long hole (85a) of the link μs is deviated to the side VC away from the bottle diagram of the valve example, and the spring With a bias of 3η! io&l! ,
The valve circle will be operated in the downward direction.

〔Effect of the invention〕

Therefore, by operating the position control hydraulic valve using feedback operating force from the work equipment and linking it so that the tilling depth is set using the draft control operating lever, the lever originally dedicated to draft control can now be used to set the tilling depth. When used as a lever, it is now possible to control the plowing depth independently without increasing the damage caused by hydraulic valves.

〔Example〕

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

As shown in Figs. 5 and 6, a hydraulic cylinder (31t-i) is installed as a hydraulic elevating mechanism on the upper surface of the rear part of the mission case (21) provided on the traveling vehicle body +11. A pair of left and right tow arms (4) are provided, a top link (5a) is attached to the rear end of the mission case (2), and a pair of left and right lower rings are interlocked and connected via a lift rond (6) to the top link (5a) at the rear end of the transmission case (2). Ground work devices such as plaque (AP) and rotary tillage device (AR) are connected through the three-point link machine al (6) consisting of (5b), so that the work device (A) can be raised and lowered by hydraulic control. Configure an agricultural tractor.

In this agricultural tractor, the ground work device (A) is
position control to raise and lower the book (AP) to a predetermined level, draft control to raise and lower the book (AP) to maintain a predetermined traction load, and a rotary tiller (AR).
J'! of self-vJ plowing depth control that raises and lowers the plowing depth to maintain it at a predetermined plowing depth. ! The system is configured such that the control in step 1 can be performed by mechanically operating the hydraulic valves described below.

As shown in FIG. 4, the pair of left and right glue arms 14
1H, the outer shell is fixed to both ends of the seven swing shafts (7) that pass through the upper part of the mission case (2+ from side to side),
A piston rod (8a) from the hydraulic cylinder (3) is pivotally attached to the free end of an arm (8) in the center of the swing shaft (7).

Also, one end of a rod (9) is connected to the base end of the lift arm (4) so as to be pushed and pulled by the swinging of the lift arm (4) on the left side (upper side in the drawing), and the transmission case (2+ The other end of the rod (91 is connected to the arm (10a) outside the case of the support shaft (101) that loosely fits into the support shaft (101). Another support shaft (lυ) is loosely fitted on the side opposite to the support shaft (11), and position levers O are mounted on the outside of the end of this support shaft (11) outside the case, and
Both supporting shafts +101, (arms (10b) and (llb) are housed inside the case, respectively, and the arms (10b) and (ob) are formed at both ends between the free ends of the vines. The balance arm (IS) is inserted through the ball joint (not shown), and the balance arm C13+
A spool (14a) of a position control hydraulic valve C141 is pivoted in the center of the position control valve C141 so as to be able to swing freely around the vertical axis, thereby forming a position control system.

That is, the position control system includes a position lever (1
21, the balance arm swings and the spool (14
m), and as a result of this operation, the 7th arm (
4) swings, the arm (lob) in the case on the left side swings via the # marked rond (9), and by further swinging the balance arm (1 field), the spool (lob) swings. 14m) to the neutral position, and when the position lever A is set to an arbitrary position, it operates to raise and lower the working device (A) to the corresponding single-body level.

As shown in Figures 1 and 2, the mission case (2
A draft control hydraulic valve 06) is provided on the right side of the valve (+5), and a setting arm H and a draft lever θη provided on the outer surface of this valve (+5) are interlocked via a rod so that the swing #I can be operated. Connected and also setting arm Q6
) is connected to the operating arm 0 sickle provided at the bottom of the feedback rod.

Also, a placket I is provided on the rear surface of the mission case (2).
2υ is fixedly installed, and a top link holder is attached in a cantilevered manner to the lower part of this bracket via a torsion bar, and the plaque (AP) and its Top link connecting one end (5m
) are connected.

In addition, stays are fixedly installed on the upper side surface of the holder facing outward, and this stage bracket is connected to the other end of the feed pack rond, and the traction load is lower than the traction load set by, for example, the draft lever 0η. If the plaque (AP) traction load increases, the torsion bar (2) will be twisted and the top link holder will swing forward, causing the operating arm DI to be operated in the upward direction of the working device. It looks like this.

As shown in FIG. 8, the hydraulic valve 95) has a link supported in a cantilevered manner at the free end of a gauging inner arm (15b) directly connected to the shaft (15a) of the setting arm (181). At the same time, the casing inner arm (19b) that is directly connected to the shaft (19a) of the operating arm 4 is housed with a screw 4 that abuts and suppresses the link 4, and the link surface on the opposite side of this pin spool (15m) of valve (+6)
), and by operating the setting arm (I), the swinging fulcrum of the link is displaced, and the spool (l+a
The swing angle of the operating arm (I) that can be used to operate the control arm (I) can be changed.

Incidentally, the position control valve α4) is configured to be a three-position switching type: up position @ (UP), neutral position yJt (6), and down position Φ), and the draft control valve (
15) is configured as a two-position switchable type with an ascending position of 1 ft (UP) and a descending position (D), and this valve 061 is in the descending position! !
The neutral state of the working device (A) is maintained by adjusting the rotation of the oil passage in (D). The oil passage system including these valves (141.a) is as shown in FIG.

In addition, when performing draft control, the position lever (12) is moved to the highest level position, that is, the hydraulic valve (12) is moved to the highest level position.
When 4+ is set to the (UP) position and position control is performed, the draft lever α Kara i is also set to the shallow level position.
That is, the hydraulic valve (15) is set to the (UP) position.

Further, a mechanism for automatically controlling the plowing depth using the above-mentioned control iaa of 12 plows is constructed as shown in Fig. M1 and Fig. 2.

In other words, a plate-shaped bracket n is provided at a position separated from the right side of the mission case (2), and a swing arm 4 is attached to the side of the mission case of this bracket (b) so as to be able to swing from side to side with a support shaft (to). Furthermore, a crank-shaped sinker we11t is provided at the free end of the arm so as to be able to swing on a support shaft parallel to the support shaft (c).

The middle part of the swing arm 4 and the playback end of the setting arm 171 are interlocked and connected via the force of the member 3, and one end of the link pull lυ of 1177 and the position lever (1'4
The link mechanism!
is connected in motion via a link μs pivoted to one end of υ,
A coil spring 3η is interposed between the members extending from the bracket and the arm cover.

Furthermore, a cam body (12 m) is attached to the base m of the position lever Q4.
) is provided, and only when the lever a is operated in the upward direction, the cam body (12a) comes into contact with the ITI arm and rotates the support shaft (1t), and when the lever is operated in the downward direction,
The support shaft (11) is configured to be operated by the urging force of the iTJ spring 3η.

The rear cover of the rotary tilling system (AR) is provided so as to be able to swing around the left and right axis, and the rocking force of the rear cover swings the link mechanism Cυ. The rear cover door and link machine ja (311) are connected via a wire and a rod decoy so that the rear cover door and the link machine ja (311) are connected to each other.

To perform automatic plowing depth control, release the connection between the stay threshold and the feedbank rod, push the rondo in the upward direction, and insert the released end into the rear of the mission case (21). It is connected and fixed to another stay (B) extending upward from the provided member circle, and the position lever O is set to the deepest position [K, which is possible by setting the position lever O to the deepest position [K]. When the reference position for automatic plowing depth control is set by moving the link mechanism to displace the center of swing, it is detected, for example, that the rear cover has swung upwards and the plowing depth has become deeper. IT&!
, the link mechanism swings by the pulling force transmitted through the wire (support) and rod 4), and the link l3119,
Automatic plowing depth control is performed by operating the support shaft (1) in the upward direction via the pin diagram and the arm.

Conversely, when the rear cover link swings downward, the link μs
By displacing the end of the elongated hole (35a) in a direction away from the pin, the support shaft (11) is operated by the biasing force of the spring 6η.

In addition, when performing automatic plowing depth control, please use the mission case (2).
A support member is further installed in the bracket circle installed on the rear surface of 1, and a top link (5a) is attached to the rear end of this support member.
The wire country is then connected to the latching member which is attached to the phantom.

[Another example]

In addition to the above-described embodiments, the present invention may configure the mechanical linkage structure in any other manner.

[Brief explanation of the drawing]

The drawings show an embodiment of the lifting control mechanism for an agricultural tractor according to the present invention, and FIG. 1 is a schematic side view of the lifting control mechanism, and FIG.
The figure shows an exploded perspective view of the operating section of the lift control mechanism, Figure 3 is a hydraulic circuit diagram of the lift control mechanism, Figure 4 is a schematic plan view showing the arrangement of the position control hydraulic valve, etc., and Figure 5 6 is a side view of the rear of the tractor with a book attached, and FIG. 6 is a side view of the rear of the tractor with a rotary tiller attached. (1)...Vehicle body, (3+...Hydraulic lifting mechanism, (+4...Operation/L/ /< -, (14
+...Hydraulic valve, ab)...Hydraulic valve, Q71...Operation lever, l)...
・・Link mechanism, name...・Plowing depth detection mechanism, prisoner...
...Ground work equipment〇Representative Patent attorney Kitamura
Correction [5 chart 611 R

Claims (1)

[Claims] Connecting the ground working device (A) to the unit (1) via a hydraulic lifting mechanism (3) so that it can be raised and lowered, and position control for raising and lowering the ground working device (A) to a predetermined level with respect to the unit (1); A hydraulic valve (14) exclusively for position control so as to perform draft control to raise and lower the ground work device (A) to maintain a predetermined traction load;
An agricultural tractor elevation control mechanism comprising a dedicated operating lever (12), a hydraulic valve (15) exclusively for draft control, and a dedicated operating lever (17), the operating lever (17) for draft control. A link mechanism (31) whose reference position changes with the operation of is provided, and this link mechanism (31)
and the hydraulic valve for position control (14), and a mechanical plowing depth detection mechanism (38) provided in the ground working device (A) and the link mechanism (31) are interlocked and connected. , from the plowing depth detection mechanism (38) to the link mechanism (
31) A lifting control mechanism for an agricultural tractor configured to operate the hydraulic valve (14) for position control using a force transmitted through the hydraulic valve (14) to automatically control the plowing depth of the ground working device (A).