JP3306142B2 - Reversible plow that can increase the piercing angle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible plow capable of increasing the piercing angle, and more particularly, to increasing the angle of the bottom with respect to the ground at the start, so-called piercing angle. The present invention relates to a reversible plow capable of increasing a lift height by lifting prior to rotation of a reversible plow.

[0002]

2. Description of the Related Art In a bottom plow device, which is one of the representative types of farming machines known in the art, when starting work in a field, a bottom mounted on a tractor is pulled from a ground contact state and the bottom of the tractor is lifted. It is well known that a considerable tractor travel distance is required to reach a predetermined depth due to the suction angle. This means that even if the plow bottom equipped on the tractor by the three-point hitch mechanism is lowered from the lifted state and comes in contact with the field ground, even if the tractor starts moving from this state, the bottom remains in the soil. The dive is due to the fact that it gradually dives into the soil due to the inherent suction angle given to the bottom.

As shown in FIG. 10, according to a conventional bottom plow, when work is started from an end e of a field f, a distance d of α + β is required to reach a predetermined depth due to a suction angle of the bottom. In other words, in the field, a headland having a size corresponding to the turning amount of the tractor and the distance d at which the bottom reaches a predetermined depth is required.

[0004]

If the headland is too wide, after the work with the plow, it is necessary to process only the headland, and even if the continuous work with the plow is performed efficiently, It is desirable that the headland be as narrow as possible, since this would reduce the efficiency for headland processing. However, since the distance d (α + β) is determined by a predetermined suction angle of the bottom, But this is short, in other words, the headland cannot be narrowed.

In the work using such a bottom plow, even if the width required for turning the tractor is reduced, a distance d (α + β) is required until the bottom reaches a predetermined depth. A relatively large area is required. Therefore, in a relatively narrow field such as Japan, the actual continuous work area by plows is reduced, and more time is required for headland processing work after work, and overall work is efficient. There was a problem that disappeared.

Further, the lift height of the plow working machine is determined by the lift capability of the tractor. Therefore, when performing a reversing operation, when the plow working machine having a plurality of lifted bottoms is driven in reverse, it is turned over. Since the central axis is oriented diagonally upward with respect to the ground, the rotation trajectory draws a conical shape, and the rearmost bottom may contact the ground, preventing smooth reversing work. Was.

Therefore, if the piercing angle can be made relatively large only in the work start state or only during the reversing work, the bottom and the like can be easily pierced into the field, the area of the headland becomes small, and the tractor can be re-circulated. With the required headland area and a small guiding distance, the work can be started immediately, and the bottom can be prevented from touching the ground and hindering the reversing work. Therefore, the present invention increases the angle of the bottom with respect to the field scene only at the start of work in plowing work, in other words, increases the piercing angle so that the bottom or the like reaches a predetermined depth at a short distance and the tractor It is an object of the present invention to provide a reversible plow capable of achieving a lift height higher than the lift capability of the reversible plow.

[0008]

In order to achieve the above object, the present invention provides a mast to which one end of a top link of a tractor is attached, and a bottom frame to which a bottom is attached up and down. An inversion drive cylinder hydraulically driven with respect to the fixed member, an oil pump for driving the inversion drive cylinder, and a hydraulic pressure source such as a switching valve are provided, and the bottom frame can be inverted by expansion and contraction of the inversion drive cylinder. In the reversible plow, the top link includes a hydraulic cylinder unit that can expand and contract along a length direction thereof, and the hydraulic cylinder unit is a parallel hydraulic pressure branched from a hydraulic pipeline from the hydraulic pressure source connected to the inversion drive cylinder. Connected to the pipeline, the reversing drive cylinder is connected to a hydraulic pressure source mounted on the tractor. It is connected via a generator,
The hydraulic pipeline of the hydraulic cylinder unit is connected by a pipeline branched at a position closer to the hydraulic pressure generation source than the differential pressure generating circuit, and a top link having the hydraulic cylinder unit is a reverse drive cylinder. The contraction starts when contracted, and the contracted state is maintained even when the reversing drive cylinder is extended.During the reversing operation, the total length of the top link is shortened, and the mast is temporarily inclined forward to reduce the piercing angle at the time of starting the operation of the bottom. It is characterized in that it can be made larger.

[0009]

According to the reversible plow of the present invention which can increase the piercing angle, the entire length of the top link attached to the mast is shortened in conjunction with the expansion and contraction of the reversing drive cylinder during the reversing operation, so that the upper end of the mast is retracted. Side, and the entire bottom can be tilted forward, in other words, the piercing angle can be increased, so that the lift can be increased during reversal work and the angle of the bottom to the ground can be increased at the start of work. The bottom can be guided to a predetermined depth with a short distance.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reversible plow according to the present invention will be described below with reference to FIGS. In these figures, reference numeral 10 in FIG. 1 and subsequent figures indicates the entire reversible plow of the present invention, and this reversible plow is provided with a plurality of bottoms 12 above and below a bottom frame 11.
A front frame 13 extending in the working width direction is provided at the foremost end of the bottom frame 11, and a position eccentric from the center axis of rotation of the front frame is determined by the cylinder of the reversing drive cylinder 14. The rod 14A is supported, and the upper end of the reversing drive cylinder 14 is supported by a mast 20, which will be described later.

Further, this reversible plow 10
A mast 21 is provided upright on the front side of the front frame 13. The front frame 13 is attached to a fixed member including the mast 21 so as to be rotatable around a rotation shaft 15.

This mast 21 has a mounting frame having a hitch pin 23 for mounting a lower link projecting in the width direction at a lower end portion thereof and extending downward in the width direction.
2 and 3 (FIGS. 2 and 3).

The posture of the mast 21 is fixed.
The reversing operation for reversing the bottom frame 11 is performed by contraction of the reversing drive cylinder 14 and extension of the next half cycle.

The reversible plow 10 is mounted on the tractor by a conventionally known three-point hitch type suspension system, a so-called lower link or top link, and the top link L has a length. It is configured to be able to expand and contract along the direction.

The top link L has a hydraulic cylinder unit 30 at an intermediate portion, and the hydraulic cylinder unit 30 is connected to a hydraulic pressure source mounted on a tractor T, which will be described later, ie, a pump P and a tank TK by a line 3.
8 and 39 are connected.

The pipes 38 and 39 branch off from the middle and are provided in parallel with the plow frame 10 described later.
, A hydraulic circuit including a reversing drive cylinder 14, which is a two-position, four-port switching valve 3.
3A, an orifice 33B for controlling the position of the switching valve 33A, a check valve 33C, and a relief valve 33D.
The pipelines 34, 3
Reference numerals 5 are respectively connected to ports of operation valves 41 constituting a hydraulic pressure generation source mounted on the tractor.

[0017] The hydraulic pressure source mounted on the tractor is
The hydraulic circuit includes a pump P, a tank TK, a hydraulic circuit, and the like.
1 and the differential pressure generating circuit 33 are connected by pipes 36 and 37 extending from the switching valve 33A, and finally by the pipes 42 and 43 extending from the operation valve 41, the pump P and the oil It is configured to be connected to the tank TK.

A line 38 connected to the hydraulic cylinder unit 30 is connected to the right chamber 31R of the cylinder 31 by a line 3
9 is connected to the left chamber 31L at one end, the other end of the pipe 38 is connected to the pipe 37, and the other end of the pipe 39 extending from the left chamber 31R is connected to the pipe 36. Each is connected.

Further, pilot check valves 38A and 39A which can be opened artificially are provided in the pipes 38 and 39.
And these pilot check valves 38
A, 39A are pipes 39 located next to each other (on the drawing),
It has conduits 38X, 39X connected to the conduit 38.

When the hydraulic cylinder unit 30 contracts, the mast 21 is tilted forward (FIG. 7), and when the mast 21 is extended, in other words, when it returns to its normal length,
The mast 21 is in a rearwardly inclined (standing) state (FIG. 8), and assumes a normal working posture as a reversible plow.

In other words, the hydraulic cylinder unit 3
When the length of the top link L contracts due to the contraction of the hydraulic cylinder unit 0, the upper end of the mast 21 is pulled toward the tractor side, and the mast 21 is in a state suitable for starting work with a plow. When 30 is extended, the entire length of the top link L is extended, and the plow device is in a normal working state.

Next, in conjunction with the reversing operation of the reversible plow 10, ie, the reversing driving operation, the mast 21
The process of changing the posture of the user will be described. First, in the reversing drive operation, the reversing drive cylinder 14 is expanded and contracted.
Is almost reversed, the remaining extension is performed by the next elongating motion. To perform this operation, first, the position of the operation valve 41 in the tractor T is switched to 41C, and the pressure oil is supplied to the line 37. From the normal X position of the switching valve 33A to the pipeline 34 and to the right chamber 14R of the reversing drive cylinder 14.

As a result, the reversing drive cylinder 14 is contracted, and the bottom frame 11 is reversed by pulling up the front frame 13. At this time, the piston fills the stroke (on the drawing). When moved to the left, no pressure is applied to the check valve 33C of the differential pressure generating circuit 33, and the relief valve 33D is switched to open the passage in accordance with the pressure of the spring.
Is applied to the switching valve 33A as an operating pressure, and the switching valve 33A is switched to the position Y.

Switching valve 33A switched to position Y
Then, the pressure oil from the pump P is supplied to the orifice 33
Through B, the check valve 33C is further opened, and the check valve 33C is added to the left chamber 14L of the reversing drive cylinder 14, and the reversing drive cylinder 14 starts to extend.

At this time, the orifice 33 is
Since there is B, it takes time to propagate the pressure, the contracted state of the reversing drive cylinder 14 is temporarily maintained, and the elongation starts after a short delay.

Prior to the start of the expansion / contraction movement of the reversing drive cylinder 14, the position of the operation valve 41 is selected to be 41C, so that the pressure oil is supplied to the pipe 38 branched from the pipe 37 at a position close to the oil pump P. Is supplied to the right chamber 31R of the hydraulic cylinder unit 30, the length of the top link L as a whole is contracted, and the mast 21 is attracted to the tractor side to be in a forwardly inclined posture. In this state, the above-described reversal driving operation is performed.

When the operating valve 41 is set to the position 41A, the pressure oil from the pump P is applied from the pipe 36 to the pipe 39, flows to the left chamber 31L of the hydraulic cylinder unit 30, and extends the hydraulic cylinder unit 30. , The length of the entire top link L is extended, whereby the mast 21 assumes a rearwardly inclined posture, and the plow device assumes a posture suitable for work.

This is called an auto mode, and the mast 21 is tilted forward when the motor is driven in reverse, so that the ground height at the rear bottom, that is, the lift height is increased. , And when you start working in this state,
Since the insertion angle of the bottom is larger than that in the working state, the bottom can be guided to a predetermined depth at a short distance α as shown in FIG.

When the operation is started with the position of the operation valve 41 in the tractor set at 41A, and the resistance force is applied to the bottom, the mast 21 tends to be in the backwardly inclined posture. Cylinder 31
The pressure oil in the right chamber 31R is driven out by the piston 32. Since the pipe 38 and the operation valve 41 are open to the tank TK, the pressure oil returns to the tank TK, and the hydraulic cylinder unit 30 extends.

Furthermore, the operating valve 41 in the tractor
Is set to 41B, the pressure oil in the right chamber 31R of the hydraulic cylinder unit 30 keeps the contracted state because the return pipe 38 is closed by the check valve 38A, and the leaning posture in the lifted state It is used for loading work and ridge crossing work.

Further, when the position of the operation valve 41 in the tractor is set to 41B, the supply of the hydraulic oil to the hydraulic cylinder unit 31 is cut off, and the check valves 38A and 39A are artificially opened, the internal pressure of the hydraulic cylinder unit 31 is reduced. The piston loses its supporting force, and the mast 21 is in a free state, so that the mast 21 can follow the plowing work on the wavy land.

In the above description, an example was described in which the rod of the hydraulic cylinder unit was attached to the mast side and the cylinder was attached to the top link side.
The present invention can be implemented even if the rod is attached to the top link side and the cylinder is attached to the mast side, and it is also possible to use the conventional working machine by replacing only the top link from the standard type It is.

As is apparent from the above description, according to the reversible plow of the present invention, the length of the plow is reduced by incorporating the hydraulic cylinder unit into the top link L mounted on the tractor. Therefore, by extending and retracting the top link in conjunction with the extension and retraction of the reversing drive cylinder, the mast can be set to the forward inclined posture or the backward inclined posture, and when the plow device is lifted, the piercing angle is increased, The distance required for the bottom to reach a predetermined depth from the start of work can be shortened, the bottom posture can be automatically controlled such as selecting the mast's backward tilt posture during work, and also during reverse work There are effects such as that the height of the lift can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of a reversible plow of the present invention.

FIG. 2 is a plan view of the reversible plow of the present invention.

FIG. 3 is a front view of the reversible plow of the present invention.

FIG. 4 is a side view showing a relationship between a mast device and a top link.

FIG. 5 is a rear view showing the relationship between the mast device and the front frame.

FIG. 6 is a hydraulic circuit diagram including a hydraulic cylinder unit.

FIG. 7 is an explanatory diagram showing a forward tilt state of the mast.

FIG. 8 is an explanatory view showing a backward tilt state of the mast.

FIG. 9 is an explanatory view showing a work start state of the reversible plow of the present invention.

FIG. 10 is an explanatory view showing a state in which the operation of the conventional reversible plow is started.

[Explanation of symbols]

 T Tractor L Top link 10 Plow device 11 Bottom frame 12 Bottom 20 Mast device 21 Mast 22 Top link mounting hole 23 Hitch pin 24 Mounting frame 25 Mounting pin 30 Hydraulic drive cylinder 31 Cylinder 32 Rod 33 Differential pressure generating circuit 33A Switching valve 33B Orifice 33C Check valve 33D Relief valve 34 Pipe 35 Pipe 36 Pipe 37 Pipe 38 Pipe 39 Pipe 38A Pilot check valve 39A Pilot check valve 38X Pipe 39X Pipe 40 Operating valve 41A Position 41B position 41C position

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-183601 (JP, A) JP-A-62-32803 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01B 3/40

Claims (1)

(57) [Claims] 1. A mast to which one end of a top link of a tractor is attached, a reversing drive cylinder which is hydraulically driven with respect to a fixed member such as the mast, and a bottom frame having a bottom mounted vertically, and a reversing drive cylinder. In a reversible plow comprising an oil pump to be driven, a hydraulic pressure generation source such as a switching valve, and a bottom frame capable of being inverted by expansion and contraction of the inversion drive cylinder, the hydraulic cylinder in which the top link can expand and contract along its length direction The hydraulic cylinder unit is connected to a parallel hydraulic pipeline branched from a hydraulic pipeline from the hydraulic pressure source connected to the reverse drive cylinder, and the reverse drive cylinder is mounted on a tractor. Connected to a hydraulic pressure source via a differential pressure generating circuit, The hydraulic pipeline is connected by a pipeline branched at a position closer to the hydraulic pressure source than the differential pressure generating circuit, and the top link having the hydraulic cylinder unit starts contracting when the reversing drive cylinder contracts. In addition, it maintains the contracted state even when the reversing drive cylinder is extended, and the length of the top link is shortened during the reversing work, so that the mast is temporarily tilted forward and the piercing angle at the start of the work of the bottom can be increased. A reversible plow characterized by: