JPH0345548Y2 - - Google Patents

Description

[Detailed explanation of the invention] 1. Purpose of the invention (1) Industrial application field This invention is based on a main frame on which an engine is mounted, and a main frame located in front of the main frame in the longitudinal direction (hereinafter referred to as "front"). (hereinafter referred to as "rear")
A frame is constructed by connecting a sub-frame equipped with a cane lifting chain inclined to the side and a cross-feeding chain having an L-shaped planar shape (hereinafter referred to as "L-shaped cross-feeding chain"), and the frame is located at the rear lower part of the sub-frame. The present invention relates to a self-propelled sweet potato harvester having a rotary cutter, and specifically, it is used to adjust the root cutting angle and root cutting height of sweet potato with the rotary cutter.

(2) Problems to be solved in relation to conventional technology There is a lifting chain installed at the front of the aircraft that is tilted backwards, and this lifting chain pulls up the cane, and the root of the pulled up cane. A rotary cutter located at the center of the rear of the sub-frame (lower center of the machine) cuts the roots in the soil and harvests them, which are then moved to the longitudinal centerline of the machine by an L-shaped cross-chain conveyor. As a conventional technology related to a self-propelled sweet potato harvester that sends the harvester to the right side (hereinafter referred to as "the right side") and harvests it to the right side of the machine, there is a
-There is one described in Publication No. 28750.

This conventional self-propelled cane harvesting machine is relatively small as a cane harvesting machine, and is excellent in terms of workability and work efficiency. In Japan, cane cultivation areas are concentrated in the south, and due to the weather in these regions, the grown cane falls in random directions, and what is called hakama (lower leaves wither and fall).
The development of a harvesting machine has been difficult because the harvesting process must be carried out with dead leaves still attached to the cane. The above-mentioned conventional sugarcane harvesting machine has been highly evaluated as having overcome various difficult problems and dramatically improving the technology of the sugarcane harvesting machine.

An outline of the mechanism of a conventional sugarcane harvesting machine will be explained to the extent necessary to clarify the premise of this invention. First, the outline of the mechanism of the conventional sweet potato harvester disclosed in the above publication is as shown in Figure 1. There is a sub-frame equipped with lifting chain frames on the left and right sides (the same applies hereinafter) with respect to the center line in the left-right and front-rear direction, and this sub-frame is connected to the main frame by left and right U-shaped frames 3, and the main frame is connected to the left and right It is supported by driving wheels 11, and the sub-frame is supported by left and right front wheels 12. A rotary cutter 10 is provided at the lower end of the drive shaft tilted forward in the middle between the left and right U-shaped frames.

A lifting chain 4 having a lifting claw 5 is stretched between the left and right lifting chain frames, and front and rear L-shaped transverse conveyor chains 7, 7 are provided above and behind the lifting chain. The mechanism and structure of this cross-feeding conveyor chain is as clearly shown in Figure 1, which shows the prior art, in which two conveyor chains that circulate along an approximately planar L-shaped frame are arranged one behind the other with a gap in between. The conveyor path has an L-shaped planar shape, and receives the cane that is conveyed from the front to the rear of the machine by the lifting chain 4 and the conveyor chain 6 in the front and back portions, and receives the cane in the front and rear direction in the lateral portions. This device performs the action of sending the device to the right with respect to the center line. The fallen sweet potato is raised up and its roots are cut in the soil with the rotary cutter 10.In order to reduce wear and damage to the rotary cutter, the rotary cutter The drive shaft 8 of
This allows the front part of the rotary cutter to dig into the soil, while the rear part is raised above the soil surface.

Although it is not mentioned in the publication, the U-shaped frame 3 on the right side is made into a thick hollow body, and the vertical axis,
It is also known that a transmission chain or the like is housed and power is transmitted from the main transmission case of the main frame to equipment such as a right-side lifting chain attached to the sub-frame via these vertical shafts and the transmission chain. In this one, the U-shaped frame is only on the right side of the fuselage.

In general, the planting depth of the sweet potato to be harvested differs depending on the sweet potato cultivation field, and the height of the ridges also differs, so the height of the rotary cutter is changed as appropriate, and the height of the rotary cutter is changed as needed. It is necessary to change the depth of cut, that is, the angle of inclination of the rotary cutter, and it may also be desirable to change the cutting height depending on the type of sugarcane.

In order to meet these demands, for example, in the case of the rotary cutter shown in FIG. 1, the length of the drive shaft 8 is adjusted to adjust the height of the rotary cutter, and the inclination angle of the drive shaft is adjusted. Adjusting α. The adjustment operation using such an adjustment mechanism is itself troublesome and requires two types of adjustment operations. Furthermore, a telescopic shaft, universal joint, etc. are required.

Above all, since the adjustment is cumbersome, there is a good chance that the operator will neglect this adjustment operation or not actually utilize this adjustment mechanism, so it is not very practical.

As an improved self-propelled sweet potato harvester that is already on the market, the drive shaft of the rotary cutter is attached to the sub-frame, and the rear part of the sub-frame is connected to the main frame by a parallel link so that it can move up and down. Further, the front wheel is vertically movably connected to the sub-frame by a parallel link to adjust the support height of the rear part of the sub-frame by the main frame, and further adjust the support height of the sub-frame by the front wheels. There is a rotary cutter in which the height above ground and the angle of inclination of the rotary cutter can be changed by raising and lowering the sub-frame itself and changing the angle of inclination of the sub-frame in the longitudinal direction. Even in this conventional improved cane harvester, the drive mechanism of the parallel link is a turnbuckle, screw rod, etc. manually operated mechanism, and in order to operate each adjustment mechanism separately, the leveling of the left and right front wheels (left and right Adjustment operations such as adjusting the inclination angle of the sub-frame to the same height are troublesome, and furthermore, the threaded parts of turnbuckles, threaded rods, etc. may become dirty or corroded by rainwater, soil, etc. There is a problem in that adjustment operations become difficult.

Therefore, this invention was developed to adjust the support height of the sub-frame by the left and right front wheels and the support height of the sub-frame by the main frame by a single operation at the handle in the above-mentioned improved sugarcane harvester. The problem to be solved is to make it possible to do so.

2. Structure (1) Measures taken to solve the problem and their effects The means of the present invention taken to solve the above problem are as follows: The rear part is connected to the rear part by a pair of upper and lower links that are equal in length and parallel to each other, and one of the pair of links is connected to the front part of the main frame by a first hydraulic cylinder, and the left and right sides of casters, etc. The front axle support member of the front wheel and the front left and right side parts of the sub frame are respectively connected by a pair of upper and lower links that are equal in length and parallel to each other, and each of the front axle supports is connected to either of the pair of links and the front left and right sides of the sub frame. and a second hydraulic cylinder,
Two three-way three-position switching valves are connected to each other by a third hydraulic cylinder, and one of them is connected to the first valve through a hydraulic pipe.
The first hydraulic cylinder is connected to a hydraulic cylinder, and the other is connected to a second hydraulic cylinder and a third hydraulic cylinder via a hydraulic pipe.

The above means works as follows. That is,
When the first hydraulic cylinder is expanded or contracted, its pair of upper and lower links rotate up and down about the connection point with the main frame, raising and lowering the rear part of the sub-frame.
Furthermore, when the second and third hydraulic cylinders are expanded and contracted, their respective pairs of upper and lower links rotate up and down around the connection point with the front axle support member.
Raise and lower the front part of the sub-frame. The two operations for raising and lowering the sub-frame are performed by two three-way three-position switching valves, so by adjusting the elevation of the front and rear parts of the sub-frame, the ground clearance of the sub-frame can be adjusted. The inclination angle in the front and back direction can be adjusted as desired.

In addition, the operation of the first hydraulic cylinder, the second hydraulic cylinder, and the third hydraulic cylinder are simultaneously performed by two three-way three-position switching valves installed near the handle provided on the main frame. , or alternatively, the ground height and longitudinal inclination angle of the subframe can be easily and quickly adjusted. After adjustment, the three-way three-position switching valve is in the neutral position, so that the first hydraulic cylinder is hydraulically locked, thereby locking the parallel link. When the parallel link is locked by the first hydraulic cylinder, the main frame and the sub frame are integrally fixed, and the rigidity of the parallel link in the vertical direction at this time is extremely high.

The second and third hydraulic cylinders that adjust the support height of the front part of the sub-frame by the left and right front wheels are both connected to the same three-way three-position switching valve, so when the three-way three-position switching valve is closed, When in position, that is, even after adjustment, the second and third hydraulic cylinders are in communication with each other via the hydraulic pipe, and for this reason, the left and right front wheels are affected by the undulations of the running surface. Alternately raise and lower the subframe.

On the other hand, the auxiliary frame is integrally fixed to the front part of the main frame by a parallel link and a first hydraulic cylinder, and the rear axle is located immediately behind the center of gravity (in the longitudinal direction) of the entire vehicle body. Therefore, the vehicle body is mostly supported by the rear axle in the left and right direction. Therefore, the left and right front wheels alternately rise and fall depending on the undulations of the running surface, equalizing the vertical load applied to the left and right front wheels, and improving the aircraft's running performance and lateral stability of the aircraft. .

(2) Embodiment A specific example of the actual implementation of the above means is shown in FIGS. 3, 4, and 5.

The improved self-propelled sweet potato harvester described above has a driving force transmission mechanism for transmitting the power from the transmission case 9 attached to the main frame to the right-hand lifting chain stretched on the sub-frame. , since it passes through the U-shaped frame 3 on the right side of the aircraft, the U-shaped frame 3 is actually much thicker than the one shown in the above publication (see Figure 3). .

Additionally, the front wheels of this improved self-propelled sweet potato harvester are caster wheels. Furthermore, since the sub frame is connected to the main frame so as to be able to move up and down, the front and rear transverse conveyor chains 7,
7 is attached to the rear lower part of the left and right lifting chain support frames 31 and 32, and the power from the main transmission case of the main frame is transmitted through a chain transmission mechanism 33 that can be bent and extended at the center of the ∧ shape when viewed from the side of the aircraft. The driving force is transmitted to the sub-transmission case 34 at the rear of the sub-frame, and via this sub-transmission case to the driving force transmission mechanism passed through the U-shaped frame 3 (see FIG. 4).

In an embodiment in which the present invention is applied to the above-mentioned improved sweet potato harvester, the front rising portion 3' of the U-shaped frame 3 located on the right outer side of the machine body and the swivel shaft 21 of the caster of the right front wheel can be freely rotated. The supporting swivel outer cylinder 22 is connected by two upper and lower links 23 and 24 that are equal in length and parallel to each other,
A swivel outer cylinder is supported at the front of the U-shaped frame. Furthermore, a hydraulic cylinder 26 is attached to the connecting pin 25 between the lower link 24 and the swivel outer cylinder 22.
The connecting pin 2 connects the piston rod 27 of the upper link 23 and the front rising part 3' of the U-shaped frame
8 is connected to the cylinder head of a hydraulic cylinder 26.

As for the right front wheel, the above is as described above, but as for the left front wheel, since there is no U-shaped frame on the left side, the only difference is that the two upper and lower links are connected to the auxiliary frame, and everything else is exactly the same. be. As described above, when the parallel link of the front wheel support mechanism and the hydraulic cylinder are combined, the vertical load applied to the front wheel 12 and the horizontal force applied to the front wheel due to running resistance both act as compressive force on the hydraulic cylinder 26. Therefore, the hydraulic cylinder has a large resistance to these forces, which is advantageous.

Further, the rear part 35 of the sub frame and the front part 36 of the main frame are connected via a connecting pin 60 by an upper link 38 and a lower link 39.

The upper link 38 is constructed by connecting the front and rear parts of the left and right rods a and b with rods c and c, in order to increase the lateral rigidity of the fuselage. A piston rod 43 of a hydraulic cylinder 42 is connected to brackets 40, 40 protruding from the lower surface via a connecting rod 41,
The cylinder head of the hydraulic cylinder 42 is connected to the front portion 36 of the main frame by a pin 44.

The lower link 39 may have the same structure as the upper link 38, or may be a single rod, but in order to ensure the lateral rigidity of the linking mechanism between the main and sub frames by the links 38 and 39, , above link 38
Since it is sufficient to have the structure shown in FIG. 5, the lower link 39 is forced to
It is not necessary to have the same structure. Although the upper link 38 may be composed of a single wide plate, in order to reduce the weight, it is most preferable to use the structure shown in FIG. 5.

Regarding the arrangement of the hydraulic cylinders 26 and 42,
The expansion of the hydraulic cylinder 42 pushes up the rear part of the sub-frame, and the expansion of the hydraulic cylinder 26 pushes the front wheel 12 down, but in this example, the links 23 and 24
Since it is not possible to maintain a large spacing due to mechanical reasons, the hydraulic cylinder 26 is arranged as shown in the figure.On the other hand, the spacing between the links 38 and 39 is sufficient, and the vertical load acting on this cylinder is Since it is large, the hydraulic cylinder 42 is simply arranged as shown in the figure.

This hydraulic cylinder 42 is a single-acting type, and its cylinder head side is connected via a hydraulic pipe to a three-way, three-position switching valve operated by a lever 50 provided at the handle. The left and right hydraulic cylinders 26, 26 are also single-acting type, and their cylinder head sides are connected to each other by a hydraulic pipe, and the hydraulic pipe is connected to a separate hydraulic cylinder operated by a lever 51 via another hydraulic pipe. Connect to the three-way, three-position switching valve.

By operating the levers 50 and 51, the hydraulic cylinder 42, the left and right hydraulic cylinders 26,
26 expands and contracts, and when the levers 50 and 51 are placed in the closed position (neutral position), both hydraulic cylinders are hydraulically locked.

As the three-way three-position switching valve interposed in the hydraulic operation circuit of the hydraulic cylinder, a conventionally well-known spool-type three-way three-position switching valve may be used.The slower the operating speed of the hydraulic cylinder, the higher the height of the sub-frame and the longitudinal direction. Since the angle of inclination can be easily adjusted, it is important to provide a suitable throttle in the hydraulic operating circuit so as to sufficiently limit the operating speed of the hydraulic cylinder. Furthermore, if the relief valve in the hydraulic circuit opens due to the impact load acting on the hydraulic cylinder, the height of the vehicle body etc. will be distorted, so the relief valve must be placed between the operating valve and the hydraulic cylinder. It's better not to let it happen.

3. Effects of the invention (1) Unique effects caused by this invention The self-propelled sweet potato harvester to which this invention is applied can reduce the support height of the sub-frame by the front wheels and main frame.
This can be easily changed by operating the handle at hand, so by making the ground clearance of the sub-frame sufficiently high, it will be easy to run freely and turn in the ridged sweet potato field. It will be easier to cross. This is because the U
In a self-propelled sweet potato harvester where the ground clearance of the central part of the mold frame 3 must be made as low as possible,
This is a very important advantage.

In addition, as mentioned in the description of the above-mentioned operation, the second hydraulic cylinder and the third hydraulic cylinder of the parallel link supporting the left and right front wheels are connected to one three-way three-position switching valve via a hydraulic pipe. By employing the connected configuration, the left and right front wheels alternately move up and down following the undulations of the running surface, and the load on both front wheels is always equalized. Therefore, it has the advantage of being excellent in running performance and being able to alleviate the lateral tilting of the aircraft body caused by the vertical movement of the front wheels due to the undulations of the running surface.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional self-propelled sugarcane harvester;
Fig. 2 is a side view of the rotary cutter shown in Fig. 1, Fig. 3 is a perspective view of a recent self-propelled cane harvester on the market to which the present invention is applied, and Fig. 4 is a side view of the rotary cutter of Fig. 1. 5 is a side view showing the front wheel axle support mechanism and the connection mechanism between the main frame and the sub frame of the one shown in the figure. FIG. FIG. 3... U-shaped frame, 10... Rotary cutter, 11... Rear wheel, 12... Front wheel, 3'...
...Front rising part of U-shaped frame, 22...Swivel outer cylinder, 23...Upper link, 24...Lower link,
26... Hydraulic cylinder, 35... Rear part of sub frame, 36... Front part of main frame, 38... Upper link, 39... Lower link, 42... Hydraulic cylinder, 50 and 51... Operation lever, 52 ...Three-way three-position switching valve.

Claims (1)

[Claims for Utility Model Registration] A main frame equipped with a handle and supported by the left and right rear wheels, and a U-shaped frame on the rear right side with respect to the center line in the longitudinal direction of the fuselage, and equipped with a main frame supported by the left and right front wheels. It has a sub-frame whose front part is supported, and the sub-frame has a planar shape L.
A cross-feeding chain conveyor is installed that protrudes to the right of the fuselage in the mold, and lifting chains on the left and right are stretched in relation to the longitudinal center line of the fuselage, and at the rear of the sub-frame on the longitudinal center line. In a self-propelled sweet potato harvester equipped with a rotary cutter, the front part of the main frame in the longitudinal direction and the rear part of the sub frame are connected by a pair of upper and lower links that are equal in length and parallel to each other. , one of the pair of links and the front part in the longitudinal direction of the main frame are connected by a first hydraulic cylinder, and the left and right front axle support members and the front side parts on the left and right with respect to the center line in the longitudinal direction of the sub frame are connected, connected by a pair of upper and lower links having equal lengths and parallel to each other, and connecting one of the pair of links and each front axle support member by a second hydraulic cylinder and a third hydraulic cylinder, respectively; A pair of three-way, three-position switching valves are provided near the handle of the main frame, one of which is connected to the first hydraulic cylinder via a hydraulic pipe, and the other is connected to the second and third hydraulic cylinders via hydraulic pipes. A self-propelled cane harvester is connected to a cane root cutting angle and root cutting height adjustment mechanism.