JPS6342007Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a traction device for a comparatively long agricultural machine such as a potato harvester.

Towing devices such as potato harvesters tend to have a large turning radius when towed by a tractor, so it is desirable that the total length including the tractor can be connected as short as possible. Further, the digging blade of a potato harvester is generally attached to a towing frame, and in order to improve the accuracy of the digging operation, it is necessary to frequently change the forward direction and depth of the digging blade. Therefore, the hit of the towing device needs to be able to horizontally rotate, move up and down, and easily change the advancing direction and depth of the digging blade. Furthermore, since the traction device drives the conveyor of the agricultural machine, it must be able to transmit the tractor's PTO power to the farm machine.

To meet the above-mentioned conditions, a traction device as shown in FIG. 1 has conventionally been widely used in potato harvesters and the like. This thing has a hitch bar 2 projecting from the center of the front part of a towing frame 1 so as to be able to turn left and right, and a mast-type hitch 3 having lower pins 4, 4 projecting from the lower end attached to the tip of the hitch bar 2.
To adjust the forward direction during work, use the hitch bar 2.
It is equipped with a double-acting hydraulic cylinder 5 that rotates from side to side. The tractor to which this towing device is connected uses a stabilizer to prevent the lower link of the hydraulic three-point link from swinging to the left or right, and connects the lower link to the lower pins 4, 4 of the mast-type hitch 3 to tow the agricultural machine. The conveyor rotary motion section of the agricultural machine is connected to the tractor's PTO via a PTO joint shaft 7 with a universal joint at both ends that connects the tractor's PTO and a transmission 6 fixedly installed below the center of the traction frame 1. The transmission rotates the transmission 6 and receives power from the transmission 6.

As described above, this towing device connects the agricultural machine to the lower link of the hydraulic three-point link of the tractor, so it is easy to connect to the tractor, and the front part of the towing frame 1 can be moved up and down by the hydraulic lifting of the lower link. By moving it up and down, the depth of the digging blade attached to the traction frame 1 can be easily adjusted. In addition, when the hitch bar 2 is turned left and right by the double-acting hydraulic cylinder 5 with respect to the tractor moving forward along the ridge during work, the agricultural machine is moved in the opposite direction to the turning direction of the hitch bar 2 due to the reaction. The direction of advance of the cutting blade is adjusted. Because of the above advantages, this towing device is widely used in potato harvesters, beet harvesters, etc.

However, recently, the drawbacks of this towing device have also been reconsidered. In other words, since this towing device is connected to the lower link that protrudes considerably to the rear of the tractor, the total length of the connection between the tractor and the work equipment becomes long, and if the tractor turns too sharply, the rear wheels of the tractor will connect to the lower link. The disadvantage is that the turning radius is still large since they are in contact. Furthermore, since the position where the lower pin of the lower link is connected is far behind the tractor's PTO, the PTO joint shaft 7 passes under the center of the mast type hitch 3, protrudes considerably forward, and connects to the tractor's PTO. There must be.
Therefore, the mast type hitch 3 is still
If the tractor makes a sharp turn before the PTO joint shaft 7 has been lifted enough to avoid it (this is often done other than during work), the outer periphery of the PTO joint shaft 7 will come into contact with the inside surface of the mast type hitch 3.
There is a drawback that damage such as bending may occur.

Therefore, the object of this invention is to provide a traction device that satisfies the above-mentioned conditions necessary for the traction device and can eliminate the above-mentioned drawbacks.

In FIGS. 2 and 3, the horizontal revolving body 9 has a recess connecting portion 11 formed at the rear of the intermediate portion, and this recess connecting portion 11 is fitted into the center of the front part of the traction frame 8 from the front. A power transmission intermediate shaft 12 is pivotably mounted horizontally to the left and right, and is disposed below the recessed connection portion 11.
are provided to extend through the front and back, and furthermore, a swing arm 13 is provided on one side of the front of the recess connecting portion 11 so as to protrude diagonally forward (see FIGS. 4 and 5). Reference numerals 14 and 14 denote side plates erected on the upper part of the horizontal revolving body 9 to face each other on the left and right sides, 1 in FIG.
Reference numeral 5 denotes a pin hole, which is bored below the power transmission intermediate shaft 12 so as to pivotally attach a longitudinal tilting body 16, which will be described later.

Next, the back and forth tilting body 16 has a hitch 17 attached to the tip of a stretchable hitch bar 18, arm plates 19, 19 erected left and right opposite to each other at the rear of the hitch bar 18, and the rear of the arm plates 19, 19. It is externally fitted onto the lower end of the horizontal rotating body 9 and is pivotally attached via a pin hole 15 and a pivot pin 20 so as to be tiltable back and forth. 7
A is a PTO joint shaft with universal joints on both ends, one end is connected to the front end of the power transmission intermediate shaft 12, and the other end passes between the arm plates 19, 19 of the longitudinal tilting body 16 and connects to the PTO of the tractor. It connects.
Furthermore, the inner distance between the arms 19, 19 of the longitudinal tilting body 16 is formed so that the outer periphery of the PTO joint shaft 7A does not come into contact with each other when the hitch 17 turns left and right, goes up and down, and when the tractor turns. Third
In the figure, 21 is a telescopic rod, 22 is a telescopic rod retaining pin, 23 is a hitch bracket, and 24, 24 are hitch mounting pins.

Figure 6 shows a hitch 17 with a connecting hole 2 at the tip.
5. Drill hitch attachment pin holes 26, 26 at the rear. The hitch 17 is attached to the hitch bracket 23 using the hitch mounting pin 2 so that it can be attached to the hitch bracket 23 upside down as shown in Fig. 3.
A plurality of holes are provided through which 4 is inserted.

Next, the single-acting hydraulic cylinder 27 has both ends pivoted 28, 29 on the inside of the top of the arm plates 19, 19 of the longitudinal tilting body 16 and the inside of the top of the side plates 14, 14 of the horizontal rotating body 9, respectively. When the stroke of the piston rod 30 is approximately half, the hitch 17 is arranged to be approximately horizontal when the traction frame 8 is horizontal. That is, the single-acting hydraulic cylinder 27 is provided so that the hitch 17 can be raised and lowered from a horizontal state almost equally up and down by its stroke. The double-acting hydraulic cylinder 31 has a protruding piece 3 protruding from the tip of the swinging arm 13 of the horizontal swinging body 9 and the front surface of the traction frame 8.
2, both ends are pivoted 33 and 34, respectively.

Moreover, the double-acting hydraulic cylinder 31 is arranged so that the hitch 17 faces in the forward direction of the traction frame 8 at approximately the midpoint of the stroke of the piston rod. That is, the hitch 17 is provided so that it can turn approximately equally left and right depending on the stroke of the double-acting hydraulic cylinder 31.

Reference numeral 36 denotes a known aircraft parking stand, which is fixedly installed on one side of the horizontal revolving structure 9. In this structure, a support 37 is inserted into a support socket 38 fixed to one side of the horizontal rotating body so as to be able to rise and fall freely, and the support 37 is fixed to the support socket 38 with a support fixing pin 39. Pin holes 40, 40...
is an insertion hole for a post fixing pin 39, which is provided so as to adjust the support height of the post 37. The lowest pin hole 40 is used to pull up the support column 37 of the aircraft parking stand 36 during work. In the figure, 41 is a support plate that can be tilted slightly back and forth, and 42 is its pivot pin.

In addition, 43, a part of which is shown by a chain line in Fig. 3, is a tractor tow bar, 44 is a hitch clevis, and 45
is a hittipin.

Next, FIG. 7 shows an operating state in which the hitch 17 horizontally turns left and right. That is, in the same figure, when hydraulic pressure is applied to the double-acting hydraulic cylinder 31 and the piston rod 35 is expanded and contracted, the horizontal rotating body 9 moves the pin 1 in the directions of arrows A and B via the rotating arm 13.
0, and at the same time, the longitudinal tilting body 16 connected to the horizontal rotating body 9 rotates together with the horizontal rotating body 9, and the hitch 17 rotates in the direction of arrow C or D. At this time, the double-acting hydraulic cylinder 31 applies hydraulic pressure when the piston rod 35 pushes or pulls, so the hitch 17 is forcibly operated in either direction of arrow C or D, and is fixed at the operated position. can do.

To explain the state in which the hitch 17 moves up and down in FIG. 8, when hydraulic pressure is applied to the single acting hydraulic cylinder 27 and the piston rod 30 is extended, the arms 19, 1
9 rotates around the pivot pin 20 and tilts forward, and the hitch 17 descends in the direction of arrow E. Since the single-acting hydraulic cylinder 27 is a single-acting type, the piston rod 30 can be manually retracted without applying hydraulic pressure.
Therefore, if you lift the hitch 17 by hand in the F direction (when connected to the tractor, the hitch load acts and the F
(the hitch rises in the direction), the arm plates 19, 19 tilt backward and the piston rod 30 retracts. Moreover, when the single-acting hydraulic cylinder 27 is brought into a state where the hydraulic pressure is maintained,
The hitch 17 is fixed.

Next, the power transmission intermediate shaft 12 connects the PTO joint shaft 7A to the front end as described above.
One end of a power transmission shaft (not shown) having a universal joint at both ends is connected to the rear end, and the other end of the power transmission shaft is connected to a transmission or the like that drives a rotating part such as a conveyor of an agricultural machine. That is, the power transmission intermediate shaft 1
2, as described above, the tractor's PTO power is
It transmits power to the rotating parts of agricultural machinery.

Next, the use of the agricultural machine equipped with the traction device of this invention will be explained. The tractor is fixed in advance so that the tow line of the tow bar 43 is aligned with the axial extension line of the tractor PTO in a straight line when viewed from above. It is desirable that the hitch clevis 44 be as close as possible to the PTO of the tractor in order to reduce the deflection of the PTO joint shaft when the tractor is turning or when the hitch 17 turns left and right. To connect the hitch 17 to this tractor, the tractor is moved backward in advance in front of the agricultural machine supported on the parking stand 36, the hitch clevis 44 is brought close to the hitch 17, and the tractor is temporarily stopped. Therefore, the single-acting hydraulic cylinder 27 and the double-acting hydraulic cylinder 31 are connected to the hydraulic pressure extraction device of the tractor through hydraulic hoses, respectively. Next, the single-acting hydraulic cylinder 27 is actuated by the hydraulic pressure of the tractor, and the hitch 17 is raised and lowered up and down as explained in FIG. 8, and is fixed at the height of the hitch clevis 44. Then, move the tractor backwards, insert the hitch 17 into the hitch clevis 44, and insert the hitch pin 4.
Connect with 5. (See Figure 3).

Next, connect one end of the PTO joint shaft 7A to the PTO of the tractor, pass the PTO joint shaft 7A through the middle of the arm plates 19, 19 of the longitudinal tilting body 16, and connect the other end to the front end of the power transmission intermediate shaft 12. Link. After connecting the PTO joint shaft, make sure that the support post 3 of the aircraft parking stand 36 does not interfere with the work.
Raise 7. To do this, when hydraulic pressure is applied to the single-acting hydraulic cylinder 27 and the hitch 17 is lowered, the tow bar 43 is fixed vertically, so the hitch clevis 44 is used as a fulcrum to move the tow frame 8 together with the back and forth tilting body 16 and the horizontal rotating body 9. The front part of the aircraft parking stand 36 is lifted off the ground. Therefore, the hitch 17 is fixed using hydraulic pressure, and the column fixing pin 3 is
9, pull up the column 37, and hold the column 37 in the lowest pin hole 40 with the column fixing pin 39.

With the above steps, the agricultural machine is connected to the tractor in a state where it can be operated. To explain the working conditions of a field, for example, when a potato harvester is harvesting, the tractor towing it moves forward along the ridge, and the working machine constantly adjusts the forward direction and depth of the digging blade according to the planting situation. Must be able to do it. On the other hand, the towing device of this invention, as explained in FIG. The towing frame is moved to the opposite side, and the forward direction of the digging blade attached to the towing frame can be adjusted. Furthermore, as explained in FIG. 8, by raising and lowering the front part of the towing frame 8 via the single-acting hydraulic cylinder 27, the depth of the digging blade can be adjusted, and the depth of the digging blade can also be lifted upward from the ground. You can also. Since these adjustments are made via hydraulic pressure, they are simple and can be made sensitively depending on the planting situation of the crops.

Next, for turning around at the end of the field, the hitch 44 of the tractor's tow bar 43 is
Because it is much closer to the tractor body,
The overall length when connected to agricultural machinery, including the tractor, is shorter than conventional ones, allowing for a smaller turning radius.
Furthermore, since the hitch bar 18 is rod-shaped, even when the tractor turns at a sharp angle, the rear wheels of the tractor do not come into contact with each other, making it easier to turn in a small radius. In addition, when turning or turning the hitch 17 left and right, the front and rear tilting body 16 and the left and right rotating body 9 are integrated.
As the PTO joint shaft 7A rotates, the inner spacing between the arm plates 19 and 19 of the longitudinal tilting body 16 is designed to prevent contact with the PTO joint shaft 7A when the tractor turns, so even if the tractor turns sharply, the conventional mast It is possible to completely prevent the PTO joint shaft 7 from coming into contact with the type hitch 3 and causing damage.

As explained above, according to the device of this invention, the hitch can be turned left and right and raised and lowered up and down using hydraulic pressure, and the agricultural implement can be connected close to the tractor via the tractor's tow bar, so it can rotate. In addition to making it easier to make small turns when traveling, it is also extremely easy to adjust the forward direction and depth of the digging blade, and it also prevents the PTO joint shaft from breaking even if it turns at a steep angle when traveling. It can be made into something that has never been done before.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional embodiment, Fig. 2 is a partially omitted front view of this devised device, and Fig. 3 is a right side view of this devised device including a part of the tractor's tow bar indicated by a chain line. 4 is a right side view of the horizontal revolving structure, FIG. 5 is a plan view, FIG. 6 is a perspective view of some parts, and FIGS. 7 and 8 are plan views of main parts showing operating states. , right side view. 8... Traction frame, 9... Horizontal revolving body, 1
0... Pin, 12... Power transmission intermediate shaft, 13...
Swivel arm, 16... Back and forth tilting body, 17... Hitachi, 18... Hitachi bar, 19, 19... Arm plate, 20... Pivoting pin, 7A... PTO joint shaft, 27... Single acting hydraulic Cylinder, 31...Double-acting hydraulic cylinder, 32...Protrusion, 36...Aircraft parking stand, 37...Strut, 38...Strut socket, 39...Strut fixing pin, 40, 40...Pin hole.

Claims (1)

[Scope of utility model registration request] It is pivoted to the center of the front of the towing frame of the agricultural machine so that it can turn forward to the left and right, and a power transmission intermediate shaft is provided below the pivot joint so as to pass through the front and back, and a swing arm is provided on one side in front of the pivot joint. A hitch is attached to the tip of a telescoping hitch bar, and arm plates are installed on the rear of the hitch bar in opposite directions, and the rear part of the arm plate is attached to the lower end of the horizontal revolving body. A front-rear tilting body is fitted externally on the body and is pivoted so as to be tiltable back and forth, one end of which is connected to the front end of the power transmission intermediate shaft, and the other end passes between the arm plates of the front-rear tilting body and connected to the PTO of the tractor. A single-acting hydraulic cylinder connects the top of the longitudinally tilting body and the top of the horizontal rotating body, and the tip of the swinging arm of the horizontal rotating body and the front of the traction frame. Equipped with a double-acting hydraulic cylinder that connects a protrusion fixed on one side, and a parking stand fixed on one side of the left and right revolving body that can be adjusted in height, the hitch can be turned almost equally left and right via hydraulic pressure. A traction device for an agricultural machine, characterized in that it is configured to move up and down almost equally from the horizontal.