JP3043955B2 - Work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine, such as a fertilizer sowing machine, which is operated by being pulled by a working vehicle such as a riding rice transplanter, and more particularly to a structure near a hitch portion thereof.

[0002]

2. Description of the Related Art Generally, fertilizer applicators include a type in which fertilizer is evenly distributed in a field, a type in which a fertilizer is injected streakly into a field, and a type in which a fertilizer is injected into a seeding portion in a dotted manner. In addition, a method of injecting in a dot form (hereinafter referred to as “injection”) has attracted attention from the viewpoint of environmental conservation. Then, the applicant has, for example, detachably mounted a working machine such as a fertilizer seeder on a connecting portion of an elevating link device disposed behind the body of the riding rice transplanter, tow the rice transplanter, and paste the same. It was proposed to inject fertilizers and the like and to sow seeds in the infused portions.

[0003]

By the way, in the above-mentioned fertilizer sowing machine, heavy objects such as a gear case for transmitting the power from the PTO shaft to the fertilizer and a drive shaft and a counter shaft for driving the fertilizer are used. When the fertilizer sowing machine is moved up and down by the link device, the link device is separated from the connection portion by being arranged far away from the hitch portion of the working machine connected to the connection portion of the lifting link device. The moment corresponding to the applied distance acts, and a force greater than the weight of the fertilizer sowing machine acts. For this reason, a large amount of hydraulic pressure is required for the hydraulic actuator of the lifting link device, and a load greater than the capacity of the hydraulic actuator of the riding rice transplanter having a relatively small capacity may be applied. Accordingly, an object of the present invention is to provide a working machine in which an excessive force is not applied to the lifting link device by arranging a heavy object on a hitch portion of the working machine connected to the connecting portion of the lifting link device. It is assumed that.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and, for example, as shown in FIG. 1 and FIG. The elevating link device is formed by the top link and the lower link that are put out, and the attachment portion installed between the rear ends of the links and the hitch portion provided at the front of the working machine are locked, so that the elevating link device is A frame extending in the traveling direction from the front part of the work machine for mounting the work machine in a vertically movable and detachable manner.
A sub-frame that is orthogonal in plan view is fixed to the front side of
Attach a hitch to the lower part of the front, and attach a gear case that transmits power from the PTO shaft to the work unit.
Attached to the square side, placing the counter shaft to its upper position
And on the subframe behind the countershaft.
It is characterized in that a drive shaft is arranged at a lower position along the axis.

[0005]

According to the construction described above, the work machine (1) has its hitch (10) mounted on the connecting portion (51) of the lifting link device (7) behind the traveling machine, and the PTO shaft (26) of the traveling machine. ) Is transmitted to the gear case (25), and further transmitted from the gear case (25) to the working unit (5) via the counter shaft (27) and the drive shaft (29). And the working machine (1)
Is moved up and down by the link device (7), the gear case (2) is attached to the hitch portion (10) of the work implement (1).
5), the countershaft (27) and the drive shaft (2)
Since 9) is arranged, no great moment is generated in the link device (7).

[0006]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the fertilizer application machine 1 has connection frames 2 and 2 extending in the traveling direction, and a drive unit 3 and a fertilizer unit 5 are disposed in front of the frames 2 and 2. The seeding unit 6 is provided behind the frames 2 and 2. The fertilizer sowing machine 1 is connected to the rear of the traveling machine of a working vehicle, for example, a riding rice transplanter (not shown), and has a top link 7a and two lower links 7 of the machine.
Lifting link device 7 consisting of parallel links having b and 7b
It is supported to be able to move up and down freely. The frame 2, 2
As shown in FIG. 2, a sub-frame 9 orthogonal to the frames 2 and 2 in a plan view is fixed to the front side of
A hitch part 10 is attached to a lower front part of the sub-frame 9. The hitch portion 10 has a plate 11,
11 are fixed to face each other, and these plates 11,
A locking shaft A is fixed above the space between the plates 11 and 11, and a locking shaft C is fixedly mounted below the plates 11 and 11 through the connecting holder 12.

[0007] As shown in FIGS. 4 to 6, an attachment portion 51 is provided at the rear end of the elevating link device 7, and the attachment portion 51 is arranged so as to sandwich the top link 7a. Plates 52, 52,
A tube shaft 53 for rotatably penetrating and supporting the top link 7a is fixed to the plates 52, 52 with bolts or the like.

A receiving member 55 having an opening is fixedly mounted above the plates 52, 52 so as to receive the locking shaft A of the hitch portion 10, and the plate 52 is formed below the plates 52, 52. , 52, a fixed shaft B extending left and right is provided, and brackets 56, 56 are fixed to both ends of the fixed shaft B. The bracket 56,5
A lower shaft 7 is rotatably connected to the lower shaft 7 via a pivot shaft. A locking shaft C of the hitch portion 10 is provided at a lower rear portion of the plates 52, 52.
R-shaped receiving portions 52a, 52a are formed so as to receive the power. The receiving portions 52 of the plates 52
A hook plate 57, 57 is rotatably supported in the vicinity of a, 52a. The plate 57, 57 is engaged with the locking shaft C by operating a hook locking device 59.

As shown in FIGS. 2 and 3, a holding member 13 is fixedly provided on the back surface of the locking shaft C below the hitch portion 10, and a square frame 15 is fixed to the holding member 13. Installed. A sled holder 16 is slidably disposed on the left and right sides of the square frame 15, and a sled 17 is supported on the holder 16 movably in the vertical direction, and is fixed by inserting and removing a locking pin 19. Further, the sled holder 16
A gauge device 20 is mounted on the left and right outer sides of the device. The device 20 has a gauge holder 23, and the holder 2
A gauge wheel 22 that is rotatable with respect to the ground surface is supported on the holder 3 so that the holder 22 can be raised and lowered by operating the handle 21.

A gear case 25 of the drive unit 3 is attached to one side of the plate 11 of the hitch unit 10, and the gear case 25 is provided with a P which protrudes from the body.
The power of the TO shaft 26 (see FIG. 1) is reduced, and the power is transmitted to the countershaft 2 via a sprocket and a chain.
7, and to the first drive shaft 29 via a chain. The counter shaft 27 is disposed above the gear case 25 and the first drive shaft 2
9 is behind the counter shaft 27 and the sub-frame 9
Along with it. A bracket 28 is fixed to a front portion of one side of the sub-frame 9.
The counter shaft 27 is rotatably supported by the bracket 28.

On the upper surface of the sub-frame 9, two distribution valves 30 and 31 are fixed via brackets 38 and 38 so as to face each other.
0 and 31 are connected to each other by a connection shaft. And
As shown in FIG. 7, the power from the drive unit 3 is
And the power from the shaft 27 is transmitted to the first drive shaft 29 via the chain 62. Further, the power from the shaft 29 is transmitted to the connection shaft of the distribution valves 30 and 31 via the chain 63, and the power from the shaft 29 is transmitted to the second drive shaft 32 via the chain 65. .

As shown in FIGS. 2 and 3, fertilizers 5, 5 are provided on both sides of the first drive shaft 29, and the fertilizers 5, 5 have a chain case 33, 3
Three. The chain cases 33, 33 are rotatably supported around the drive shaft 29,
At the lower part of the chain cases 33, 33, a holding bracket 6 is provided.
6, 66 are fixedly provided. The brackets 66, 66 are fixed to the sled holder 16 with an insertion / removal pin. When the fertilizer application section 5 is not used, a holding member is interposed between the holding bracket 66 and the sled holder 16 so that the fertilizer application section 5 can be folded and stored. Have been. Crank shafts 35, 35 are rotatably supported on the chain cases 33, 33. Crank arms 36, 36 are fixed to the crank shafts 35, 35. 37, 37 are rotatably connected. And the fertilizer application parts 5,5 are provided with the chain cases 33,33.
With the rotation of the crankshafts 35, 35, the nozzles 37, 37 are moved up and down via the crank arms 36, 36 to inject fertilizer into the ground.

As shown in FIGS. 2 and 3, a large number of collars 39 are inserted into the first drive shaft 29 so as to sandwich each of the chain cases 33, 33. The collar 39 is secured with a washer and is fixed with a bolt so that the chain case 33 can be freely rotated. By changing the insertion position of the collar 39, adjustment between the fertilizing strips can be performed.

On the other hand, the seeding section 6 has a seeding frame 43 supported by rollers 41 and 42.
The nozzle part 45 is arrange | positioned at the upper part of. The power from the second drive shaft 32 is transmitted to the nozzle shaft 46 in the nozzle portion 45 via a sprocket and a chain.
Has been transmitted to. A large number of nozzles 47 are radially fixed to the nozzle shaft 46, and the nozzles 47 suck the seeds in the seed hopper 49 with a vacuum pump 50, and then sow the seeds on the drip portion with the nozzles 47. It is.

Since the present embodiment has the above-described configuration, when the fertilizer application machine 1 is mounted on a traveling machine body for performing fertilizer application and the like, first, the fertilizer application machine 1 in a stationary state is used.
The attachment part 51 of the link device 7 of the traveling body is brought closer to the hitch part 10. In this state, when the lifting link device 7 is slightly lifted so that the locking shaft A of the hitch portion 10 is received by the receiving member 55, the fixed shaft B of the attaching portion 51 is lifted.
Rides on the connection holder 12 of the hitch portion 10. Then, by operating the hook locking device 59 of the lifting link device 7, the hook plates 57, 57 are locked to the locking shaft C, and the mounting operation is completed.

At the time of fertilizer application, the power from the PTO shaft 26 is reduced in the gear case 25, the reduced power is transmitted to the counter shaft 27, and the power from the shaft 27 is further transmitted to the first drive shaft. 29. Then, the power from the drive shaft 29 is transmitted to the fertilizer section 5 and also to the second drive shaft 32, and further transmitted to the seeding device 43 of the seeding section 6 for fertilization and sowing work. Is performed.

Since heavy objects such as the gear case 25, the counter shaft 27, the drive shaft 29 and the chain case 33 are concentrated near the hitch portion 10 of the fertilizer application machine 1, the lifting link device 7 Since the moment due to the heavy object is small, the hydraulic actuator for operating the link device 7 does not require a large amount of oil pressure, and it is not necessary to reinforce the top link 7a and the lower link 7b of the lifting link device 7.

The gear case 2 is attached to the hitch portion 10.
By arranging 5, the gear case 25 and the PTO shaft 26 of the traveling body approach each other, so that a power transmission member (for example, a coupler or a flexible joint or the like) from the PTO shaft 26 to the gear case 25 can be shortened. The efficiency of power transmission is improved, and the weight of the member can be reduced by shortening the member.

[0019]

As described above, according to the present invention, heavy objects such as the gear case (25), the counter shaft (27) and the drive shaft (29) are concentrated on the hitch portion (10) of the working machine (1). The link device (7) can be moved up and down without generating a large moment in the link device (7), and a large hydraulic pressure is not required for the hydraulic actuator of the link device (7). Further, since the force by the moment does not act on the link device (7), it is not necessary to reinforce the link portion. Reference numerals in parentheses are for referring to the drawings, and do not limit the configuration.

[Brief description of the drawings]

FIG. 1 is a side view showing a fertilizer application machine to which the present invention is applied.

FIG. 2 is a perspective view showing a front side portion of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view showing the lifting link device.

FIG. 5 is a plan view showing a lifting link device.

FIG. 6 is a rear view showing the lifting link device.

FIG. 7 is a power transmission diagram of the fertilizer application machine.

[Explanation of symbols] 1 Fertilizer application machine2 frames  7 Elevating link device 7a Top link 7b Lower link9 Subframe  DESCRIPTION OF SYMBOLS 10 Hitch part 25 Gear case 26 PTO shaft 27 Counter shaft 29 Drive shaft 51 Attachment part (connection part)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A01C 15/00-23/04 A01B 71/00-71/08 A01C 11/00 302

Claims (1)

(57) [Claims] 1. An ascending and descending link device is formed by a top link and a lower link extending vertically rearward from a traveling machine body in an up-and-down direction. A frame extending in the traveling direction from a front portion of the work machine so that the work machine can be vertically lifted and detachably mounted on the lifting link device by locking with a hitch portion provided on the section.
A sub-frame that is orthogonal in plan view is fixed to the front side of
Attach a hitch to the lower part of the front, and attach a gear case that transmits power from the PTO shaft to the work unit.
Attached to the square side, placing the counter shaft to its upper position
And on the subframe behind the countershaft.
A work machine characterized in that a drive shaft is arranged at a lower position along the same .