JPH0636652Y2 - Lifting device for seedling planting equipment in riding type rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the structure of a device for raising and lowering a seedling planting device in a riding type rice transplanter.

[Conventional technology]

Conventionally, a seedling planting device is movably connected to the rear part of the traveling machine body through a link mechanism composed of vertical links, and the seedlings are planted by driving a hydraulic cylinder that mounts the link mechanism between the traveling machine body and the link mechanism. Raising and lowering the device is known, for example, from Japanese Utility Model Laid-Open No. 57-187012.

Further, in this publication, the lower link in the link mechanism is directly connected to the rear body frame of the traveling vehicle body, and one upper link is connected to a flange erected on the body frame, and one end is attached to and supported by the upper link. The other end (front end) of the hydraulic cylinder is attached to and supported by the rear end of the transmission case located forward of the rear wheels.

On the other hand, in Japanese Unexamined Patent Publication No. 58-9607, rear wheels are attached to the rear end sides of a pair of left and right transmission cases that are fixed to the left and right sides of the transmission case and extend rearward and downward. It is disclosed that a base of a link mechanism is pivotally attached to a connecting member that connects the cases to the left and right, one end of a hydraulic cylinder is supported by the link mechanism, and the other end is supported by a rear end of the mission case.

[Problems to be solved by the invention]

However, in these conventional techniques, when the hydraulic cylinder is disposed below the vehicle body frame, the hydraulic cylinder is easily exposed to muddy water, and the muddy water adhering to the piston rod of the hydraulic cylinder and the pivot pin of the link mechanism is completely protected. In addition, since the hydraulic cylinder is located at a low position, it is difficult to maintain.

In addition, there is a problem that the link mechanism has a weak connection strength to the vehicle body frame (the former) or the transmission case (the latter).

Furthermore, in the latter technology, the base end (front end) of the hydraulic cylinder is
However, there is also a problem in that the length of the hydraulic cylinder becomes extremely long because it is supported at the rear end of the transmission case, which is a midway part in the front and rear of the traveling body.

An object of the present invention is to provide a lifting device for a seedling planting device that solves the above problems.

[Means for solving problems]

In order to achieve the above-mentioned object, in the present invention, the engine is mounted at the front position of the traveling machine body having the front and rear wheels, and the seedling planting device can be freely moved up and down via the link mechanism composed of the up and down links at the rear part of the traveling machine body. In the riding type rice transplanter configured to move up and down the seedling planting device by driving a hydraulic cylinder mounted between the link mechanism and the traveling machine body, a pair of left and right body frames of the traveling machine body While arranging the hydraulic cylinder above, a portal frame is erected so as to connect the left and right body frames to the left and right, and a link mechanism connected to the portal frame supports one end of the hydraulic cylinder. The other end of the hydraulic cylinder is supported by a support plate provided on a lateral beam connecting the left and right body frames.

[Operation and effect of device]

In this way, since the pair of left and right vehicle body frames, which are the rear parts of the traveling machine body, are connected by the standing gate-shaped frame and the lateral beams, the traveling machine body has high strength (rigidity) and the link mechanism is connected to the gate-shaped frame. By connecting the above, the rigidity of the connecting portion is increased, and wasteful displacement such as twisting of the link mechanism is eliminated as the seedling planting device moves up and down. Has the effect of disappearing.

Further, since the hydraulic cylinder is disposed above the vehicle body frame, even if muddy water jumps up during traveling in a field, the hydraulic cylinder is less likely to reach, and the hydraulic cylinder can be installed at a high position. Since it is arranged, it has an effect that the working posture of the maintenance becomes easy.

〔Example〕

In the following, an embodiment will be described. In FIG. 1, reference numeral 1 denotes a traveling machine body, and the traveling machine body 1 includes a pair of left and right vehicle body frames 2, front wheels 3, 3 which are attached to a lower surface of a front portion thereof, and an axle case 4 on a lower surface of a rear portion thereof. It is composed of rear wheels 5 and 5, and is provided with a steering seat 6 and a steering wheel 7 on the upper surface of the body frames 2 and 2, and is continuously stepped between the body frames 2 and 2 located in front of the axle 9 of the rear wheels 5. A power transmission unit case 10 with a speed change mechanism 11 is provided, and the rear wheels 5 are driven via the power transmission mechanism in the power transmission unit case 10 by the driving force of the engine 8 on the front surfaces of the vehicle body frames 2 and 2. The front wheels 3 are driven via the propulsion shaft 12.

Reference numeral 13 designates a seedling planting device which is attached to the rear part of the traveling machine body 1 through a parallel link mechanism 14 so as to be movable up and down, and is located above the power transmission case 10 and in front of the axle 9 of the rear wheel 5. The hydraulic cylinder 15 arranged in the above-mentioned section largely drives the seedling planting device 13 up and down through the parallel link mechanism 14.

The seedling planting device 13 includes a transmission case 16, a central transmission case 17 attached to one side of the transmission case 16 and a transmission case 19 attached with an appropriate interval via a connecting pipe 18 having a transmission shaft inserted therein. , 19, central float 2 arranged on the lower surface of transmission case 17
0 and the float 21, which is arranged on the lower surface of each planted transmission case 19,
21 and a seedling stand 22 that is arranged so as to be inclined so that the upper end thereof approaches the traveling machine body, and a so-called rotary type planting mechanism 23 is provided on the rear left and right sides of the central planting transmission case 17 and each planting transmission case 19. It is provided.

The parallel link mechanism 14 includes a top link 24 and a pair of left and right lower links 2 as shown in FIGS.
5, 25, and the gate-shaped frame 26 is erected so as to connect between the rear parts of the pair of left and right vehicle body frames 2, 2. The base end of the top link 24 is pivotally attached to the upper part of the gate-shaped frame 26 by a pin 27. Is
The tip of the top link 24 is a hitch portion 28 in the seedling planting device 13.
Pin 29 is pivotally attached to the upper end of.

The base ends of the pair of lower links 25, 25 are attached to a shaft 33 that is rotatable around an axis connecting the lower ends of the gate-shaped frames 26, and both lower links 25, 25 have the same structure. It is reinforced by a frame structure member such as a space truss composed of a vertical arm 30 and a stay 31 configured on the upper side.

That is, the base ends of both lower links 25, 25 pivotally attached to the lower end of the hitch portion 28 are fixed to a rotatable shaft 33 disposed between the pair of left and right body frames 2, 2. A pair of vertical arms 30 and 30 standing upright from both lower links 25 and 25 and a pair of stays 31 and 31 attached to the shafts 33 on the proximal end side of both lower links 25 and 25 are connected by a connecting shaft 34. The left and right lower links 25, 25 are reinforced by auxiliary members of a three-dimensional frame structure that is pivotally attached and has a triangular shape in a side view.

The cylinder block 15a of the hydraulic cylinder 15 disposed rearward on the upper surface side of the power transmission case 10 is composed of a pair of left and right front and rear gate-shaped frames 35, 35 and a horizontal beam 36 standing on the upper surface of the vehicle body frame 2. A spring 40 that is inserted into the hole 38 of the support plate 37 that is fixed between them and that is loosely fitted to the outer periphery of the cylinder block 15a.
The receiving plate 39 at the front end of the cylinder block 15a and the supporting plate 3
The cylinder block 15a is elastically supported by being mounted between the front surface of the vertical arm 30 and the stay 31 and the piston rod 15b of the hydraulic cylinder 15 which protrudes rearward.
It is attached to the connecting shaft 34 with the mounting piece 41.

Further, the hydraulic oil injection port 42 in the hydraulic cylinder 15
By injecting hydraulic oil from the piston rod 15b retracts into the cylinder block 15a, the vertical arm 30 is rotated, and a pair of lower links 2 are reinforced by stays 31 and the like.
The 5,25 are rotated upward so that the seedling planting device 13 is largely lifted. At this time, air is discharged from the port 43.

Therefore, when the seedling planting device 13 is hydraulically operated to be lifted, a tensile force acts on the piston rod 15b of the hydraulic cylinder 15.

By the way, in the past, when the lower link or the top link was turned upward so as to raise the seedling planting device, the ram in the single-acting hydraulic cylinder was configured to operate in a protruding manner. Since the compressive force acts on the ram, the diameter of the ram was increased in consideration of its durability against buckling.

On the other hand, as in the present embodiment, when the load at the time of raising the seedling planting device 13 is applied, by operating the hydraulic cylinder so that a tensile force acts on the piston rod 15b of the hydraulic cylinder 15, the piston rod Since it is not necessary to make the diameter of 15b larger than that in the case of compression, the weight can be reduced.

In this configuration, at the time of rice planting work, a seedling mat is placed on the surface of the seedling placing table 22, while the hydraulic cylinder 15 is driven to lower the seedling planting device 13 to float the floats 21, 20, 21 in the field scene 44.
If the wheels 3 and 5 are driven in the state of being grounded, the aircraft will go straight, and by driving the planting mechanism 23, seedlings will be planted one by one from the seedling mat on the seedling mounting table 22 with the seedling planting claws. Seedlings can be planted along the multiple lines (6 lines in this embodiment) in the field 44 while dividing.

In that case, since the hydraulic cylinder 15 is disposed on the upper surface side of the power transmission unit case 10 in the traveling machine body 1, the farm scene 44
Even if the muddy water splashes up, the muddy water does not reach the hydraulic cylinder 15. Further, since the power transmission unit case 10 and the hydraulic cylinder 15 are arranged at the rearward position of the traveling machine body 1 and the engine 8 is arranged at the frontward position, the weight balance in the longitudinal direction of the traveling machine body is improved.

Then, when the traveling vehicle body 1 in the field is turning or traveling on the road, in order to greatly raise the seedling planting device 13, the hydraulic cylinder 15 is operated and the piston rod 15b thereof is retracted. The pair of lower links 25, 25 is turned upward through the reinforcing member.

In this case, as compared with the conventional configuration in which the piston rod of the hydraulic cylinder is connected so as to push up the middle portion of the top link 24 or the lower link 25 in the front-rear longitudinal direction,
No bending force acts on the top link or lower link,
Moreover, by connecting the reinforcing member composed of the vertical arm 30 and the stay 31 to the pair of lower links 25, 25, a three-dimensional frame structure of a side cylinder block triangular shape is configured, so that the seedling planting device 13 is moved up and down. It is possible to reduce the weight of the parallel link mechanism 14 as a connecting device.

The three-dimensional truss structure including the two vertical arms 30 and the two stays 31 and the pair of lower links 25, 25 is a truss structure even in a plan view, so that the rigidity against torsion in the left-right direction is also improved.

Since a tensile force acts on the stay 31, a wire may be used instead of the rod member, or only one wire may be used.

It goes without saying that the present invention can be applied to a case where the planting mechanism 23 is not a rotary type but a vertically swinging type planting mechanism.

[Brief description of drawings]

The drawing shows an embodiment of the present invention. Fig. 1 is a side view of a rice transplanter, Fig. 2 is a plan view, Fig. 3 is an enlarged sectional view taken along line III-III of Fig. 2, and Fig. 4 is a third view. FIG. 4 is a plan view taken along line IV-IV in FIG. 5, and FIG. 5 is a side view taken along line VV in FIG. 1 ... traveling body, 2 ... body frame, 3,5 ... wheels,
8 ... Engine, 9 ... Axle, 11 ... Continuously variable transmission, 10
...... Power transmission case, 13 ...... Seedling planting device, 14 ...... Parallel link mechanism, 15 ...... Hydraulic cylinder, 15a ...... Cylinder block, 15b ...... Piston rod, 22 ...... Sapling mounting table, 24 ......
Top link, 25,25 …… Lower link, 26,35,35 ……
Gate frame, 27,29 …… Pin, 30 …… Vertical arm, 31,31
...... Stay, 32,33 …… Axis, 34 …… Coupling axis, 36 …… Horizontal beam, 37 …… Support plate, 39 …… Reception plate, 40 …… Spring, 41 ……
Mounting piece, 42 …… Injection port, 43 …… Port.

Claims (1)

[Scope of utility model registration request] 1. An engine is mounted at a position closer to the front of a traveling machine body having front and rear wheels, and a rear part of the traveling machine body is vertically movably connected to a rear part of the traveling machine body through a link mechanism including upper and lower links.
In a riding type rice transplanter configured to raise and lower a seedling planting device by driving a hydraulic cylinder mounted between the link mechanism and the traveling machine body, the hydraulic pressure is provided above a pair of left and right body frames of the traveling machine body. A cylinder is provided and a portal frame is erected so as to connect the left and right vehicle body frames to the left and right, and one end of the hydraulic cylinder is supported by a link mechanism connected to the portal frame. A lifting device for a seedling planting device in a riding type rice transplanter, characterized in that the other end is supported by a supporting plate provided on a lateral beam connecting the left and right body frames.