JPH0442972Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to an automatic work equipment lifting device for a mobile agricultural machine, which is equipped with a planting device, a seeding device, a fertilizing device, or other work equipment so as to be able to be raised and lowered.

(b) Conventional technology Conventionally, the automatic planting section of a rice transplanter has been developed in which the planting section is raised via a link mechanism etc. in conjunction with the depression of the handbrake pedal, thereby simplifying the lever operation when the machine rotates. The lifting device is actually 1986-48336.
This is already known from the publication No.

(c) Problems to be solved by the invention The above-mentioned known automatic planting part lifting device does not raise unless the handbrake pedal is fully depressed.
Also, when depressing the handbrake pedal mentioned above,
Since a large number of parts must be operated simultaneously, a large operating force is required, which causes operator fatigue, and the complicated mechanism poses difficulties in adjustability and maintainability.

(d) Means for solving the problem The present invention solves the drawbacks of the above-mentioned known devices by mounting a working machine on the machine body so that it can be raised and lowered by a hydraulic cylinder, and by providing a steering control such as a side clutch pedal or a handbrake pedal in the control section. In a mobile agricultural machine equipped with a hydraulic pedal, an operating lever that switches the hydraulic lever to a raised position by rotating once in one direction is provided opposite to the hydraulic lever that switches the switching valve of the hydraulic cylinder, and the operating lever is provided with: This problem was solved by interlocking an electric device that controls the operation lever so that when the steering pedal is depressed, the operating lever rotates once and stops at the standby position.

(e) Effect When you depress the steering pedal to turn the aircraft during work, the brake or clutch is activated and the aircraft turns, and at the same time, the electric device responds to the depression of the steering pedal and increases the hydraulic pressure. The cylinder's switching valve switches to the up side, which causes the work equipment to rise.

(F) Embodiment Below, an embodiment of the present invention will be explained with reference to the drawings. 1 is a fuselage with an engine 2 mounted in the front and front wheels 3, 3 mounted below via a differential mechanism 3a. The swing chain cases 5, 5 which pivotally support the rear wheels 4, 4 are supported by a wheel drive shaft via side brakes 6, 6 and a side clutch, and a plurality of planter cases 7 are provided at the rear of the fuselage 1.
a, a large number of planting rods 7..., and a float 8...
A planting section 10 consisting of a seedling platform 9 etc. that reciprocates left and right is connected to a top link 11 and a lower link 12,1.
The control unit 13 includes a steering wheel 14a, a control seat 14b, a planting clutch lever 15, a hydraulic lever 16, handbrake pedals 17, 17, and other levers.

Further, the base of a hydraulic cylinder 18 is pivotally supported at the rear of the transmission case 1a that constitutes a part of the aircraft body 1, and the piston rod 19a protruding from the ram 19 of the hydraulic cylinder 18 is attached to the top link 11.
It is connected to an arm 20 protruding from.

A switching valve 23 connected to the hydraulic cylinder 18 via an oil guide pipe 22 is attached to the hydraulic pump 21 mounted on the mission case 1a, and the rear part of the operating member 24 of the switching valve 23 A swing link 25 whose lower part is pivotally supported by the body 1 and whose lower part is pulled forward by a spring 25a, a connecting rod 26, and a support frame 27 for the planting part 10.
Since it is connected to the float 8 via a bell link 28, connecting rods 29, 30, and a swing link 31, which are pivotally supported by the float 8, when the ground pressure of the float 8 changes due to the height of the tiller, the Operation member 2
4 moves back and forth, and the arm 23a of the switching valve 23 is switched to a finishing position U, a neutral position N, and a lowered position D.

(a) Connection between the steering pedal (side clutch or handbrake pedal) and the operating member 24 The rear part of the operating member 24 is formed as a plate with a long hole 24a, and is pivoted to the fuselage 1 with a fulcrum pin 32. A pin 34 protruding from the upper part of the rocking plate 33 is loosely fitted into the elongated hole 24a, and the lower part is connected to the base of the hydraulic lever 16 by a connecting rod 35. It is connected to the lever of the clutch via a wire 15a or an interlocking mechanism such as a link.

The hand brake pedals 17, 17, which are pivotally supported by a support shaft 36, have an operating arm 3 at the base.
7, 37, and the actuating arms 37, 37 are connected to the brake arms 3 of the hand brakes 6, 6.
The protrusions 40, 40 are interlocked and connected to the side brake pedals 8, 38 by rods 39, 39, and projecting pieces 40, 40 protrude from the bosses of the hand brake pedals 17, 17.
3 and 43 and are close to each other and face each other.

Also, a stay 44 supporting the support shafts of the planting clutch lever 15 and the hydraulic lever 16 is provided.
is fixed to a pipe 46 that is integral with the upper part of a support column 45 rising from the fuselage 1, and a motor 47 rotates when the petal switches 43, 43 are turned on and off.
is attached to a mounting plate 48 welded to the pipe 46, and a triangular plate 16a integral with the base of the hydraulic lever 16 is welded to the front part of a lever plate 50 having a pin 49 with a roller at the rear. The operating lever 52, which rotates about the horizontal axis 51 in conjunction with the rotation, has a pin 53 near the base, and when it rotates forward, its tip abuts against the roller-equipped pin 49.

Furthermore, the contact piece of the motor stop switch 54 attached to the rear middle part of the mounting plate 48 is turned on and off by the pin 53 of the operating lever 52, and the interlocking pin 55 fixed to the rear face of the middle part of the planting clutch lever 15 is turned on and off by the hydraulic pressure. Since the hydraulic lever 16 protrudes within the operating locus of the lever 16, in the process of tilting to the rear raised position, the hydraulic lever 16 engages with the interlocking pin 55, rotates the planting clutch lever 15 to the rear cut position, and the lever A hydraulic fixing switch 58 is provided on the lower surface of the neutral stage of the hydraulic lever guide groove 57 formed in the panel 56.

(b) Connection between the hydraulic cylinder 18 (or a member linked thereto) and the operating member A regulating rod 61 in which a stopper nut and a compression spring 60 are interposed is loosely fitted to the control plate 59 fixed to the ram 19 of the hydraulic cylinder 18. However, since the regulating rod 61 is connected to the front part of the triangular plate 16a protruding forward from the base of the hydraulic lever 16 by a wire 62,
Immediately before the ram 19 of the hydraulic cylinder 18 pushes out and raises the planting section 10 to a predetermined height, the control plate 59 comes into contact with the compression spring 60, and the ram 19 further pushes out and compresses the compression spring 60. At the same time, when the planting section 10 reaches a predetermined raised position, the compression spring 60
The repulsive force becomes larger than the locking force of the hydraulic lever 16, and the wire 62 pulls the triangular plate 16a, causing the hydraulic lever 16 to rotate forward. At that time, the hydraulic lever 16 has a support shaft in the front-rear direction at the base and a spring that biases the rotation toward the neutral stage, so the hydraulic lever 16 engages with the neutral stage, and the planting part 10 The rising position is maintained.

In the above-described device, a control unit 63 for controlling the operation of the motor 47 is attached to the mounting plate 48, and the control unit 63 controls the operation of the motor 47.
3. Motor stop switch 54 and motor 4
7 is connected to the control unit 63 as shown in FIG.

During work, when one side brake pedal 17 is depressed to turn the aircraft, the protrusion 40
presses petal switch 43 to turn it on.

At this time, on the one hand, the motor 47 starts and the operating lever 52 rotates counterclockwise from the position shown in FIG. Rotating, hydraulic lever 16 and interlocking pin 5
5, the planting clutch lever 15 is tilted to the raised position and the off position as shown in FIGS. Rotate forward to the desired position and stop.

On the other hand, after the front operating lever 52 kicks the roller pin 49, the pin 53 of the operating lever 52
When the motor leaves the contact piece of the motor stop switch 54, the motor stop switch 54 is turned on, but the motor 47 continues to rotate, and the operating lever 52
rotates 360 degrees in about 1 second, and when the motor stop switch 54 is turned OFF, the motor 47 stops, and at this stop, the hand brake pedal 17
Even if the user continues to press the button, the hydraulic lever 16 returns to the neutral position and the hydraulic locking switch 58 is turned on, so the motor 47 does not operate.

Next, the control circuit will be explained in more detail with reference to FIGS. 6-7.

As shown in FIG. 6, this control circuit connects a timer circuit _T1 to the output side of the petal switches 43, 43 and the hydraulic fixed switch 58, and a timer circuit _T2 to the output side of the motor stop switch 54, and connects them and the above-mentioned. A flip-flop circuit FF, a transistor 64, and a relay 65 are inserted between the motor 47 and the planting part 10 is lowered during planting work and automatically controlled by float sensing, and when the When the hydraulic lever 16 is in the lowered position or raised position when the aircraft rotates, etc., the hydraulic lever 16 is not in contact with the normally closed hydraulic fixed switch 58, so the hydraulic lever 16 is turned ON as shown by the solid line in FIG.
When the hand brake pedal 17 is depressed in this state, the petal switch 43 is turned on and an L level signal is input to the timer circuit _T1 .
The timer circuit _T1 always outputs an H level signal, but if the above input is longer than _t1 hours, it outputs an L level signal for _t2 hours after _t1 hours, which is used to set the flip-flop circuit FF. is input to side S,
The output Q of the flip-flop circuit FF changes from L level to H level, transistor 64 turns on, and relay 65 turns on as shown by the dotted line.
The motor 47 rotates, and the operating lever 52 rotates as described above, tilting the hydraulic lever 16 to the rear raised position and the planting clutch lever 15 to the cut position, so that the planting section 10 is raised in about 2 seconds. At the same time, when the lift is completed, the hydraulic lever 16 returns to the neutral position and the lifted state is maintained, and in this state, the handbrake pedal 17 is depressed to rotate the aircraft.

On the other hand, the motor stop switch 54 is turned ON by the rotation of the pin 53, and the L level signal is turned on by the timer.
When the signal is input to T ₂ , the input to the reset side R of the flip-flop circuit FF changes from the H level to the L level signal from the output Q ₂ , and the output Q changes from the L level to the H level, and this H level signal _is Time (2
~3 seconds).

On the other hand, from _the timer _T2 to the set side S of the flip-flop circuit FF, there is a signal _t3 which changes to H level at the same time as the input to the reset side R.
Since the time (2 to 3 seconds) is input, even if you step on the handbrake pedal 17 and input the L level signal from timer _T1 during this time, the motor 47 will not operate and the aircraft will remain in the neutral position when turning. Inconveniences such as the hydraulic lever 16 tilting to the raised position do not occur.

Furthermore, when the time for which the handbrake pedal 17 is depressed is shorter than _t1 , for example, when the handbrake pedal 17 is depressed during planting to correct the running direction, the timer _T1 does not output an L level signal. , the planting part 10 does not rise, and reliable planting can be continued.

In the above-mentioned embodiment, the planting section 10 was explained as an example of the working machine, but the working machine can be used as the planting section 10.
The same effect can be obtained by using a seeding device or fertilizing device instead. In addition, in the working equipment lifting device, if the operating member 24 is used for automatic control by float sensing, there is no need to provide a separate operating member just for raising the working equipment, which is advantageous. It goes without saying that the present invention can also be applied to mobile agricultural machinery that does not have a device.

Furthermore, the same purpose can be achieved by using the steering pedal as a side clutch pedal instead of the above-mentioned hand brake pedal.

(g) Effects of the invention Since the invention is configured as described above, the work equipment will automatically rise by simply stepping on the steering pedal.
There is no need to raise the work equipment when the machine rotates, which requires various operations, and the hydraulic lever 16, which switches the switching valve 23 of the hydraulic cylinder 18, can be turned once in one direction to adjust the hydraulic pressure. An actuating lever 52 for switching the lever 16 to a raised position is provided, and an electric device is linked to the actuating lever 52 so that when a steering pedal is depressed, the actuating lever 52 rotates once and stops at a standby position. By connecting, the operating lever 52 and the electric device can be installed using the space near the hydraulic lever 16, and the hydraulic lever and its operating system, which is a manual operation means for raising and lowering the work machine, can be installed. It is possible to switch the switching valve 23 by using this function, which simplifies the switching operation mechanism of the switching valve 23 when the steering pedal is depressed, thereby reducing costs.In addition, the hydraulic lever 16, which is in the lowered position, can be automatically switched. It can be returned to the raised position.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1 a is a side view of the main parts in the planting operation state, b is a plan view of the switching valve, c is a plan view of the lever part, Fig. 2
Figure a is a side view of the main parts when the steering pedal is depressed, b is a plan view of the switching valve, c is a plan view of the lever part, Figure 3 is a side view of the riding rice transplanter, and Figure 4 is the hydraulic pressure. FIG. 5 is a front view of the lever control section, FIG. 5 is a diagram showing the relationship between the control unit and switches, etc., FIG. 6 is a control circuit diagram, and FIG. 7 is an output diagram. 10... Planting part, 15... Clutch lever, 1
6... Hydraulic lever, 17... Hand brake pedal, 18... Hydraulic cylinder, 24... Operation member, 43... Petal switch, 47... Motor, 50... Lever plate, 52... Operating lever, 5
4...Motor stop switch, 58...Hydraulic fixing switch.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine in which a working machine is mounted on the machine body 1 so as to be raised and lowered by a hydraulic cylinder 18, and a steering section 13 is provided with a steering pedal such as a side clutch pedal 17 or a hand brake pedal, the switching valve 23 of the hydraulic cylinder 18 is used. An operating lever 52 is provided opposite to the hydraulic lever 16 that switches the hydraulic lever 16 to the raised position by one rotation in one direction, and when a steering pedal is stepped on the operating lever 52, the operating lever 1. An automatic working machine lifting device for a mobile agricultural machine, characterized in that an electric device is interlocked to control the rotating part 52 to rotate once and stop at a standby position.