JP3486375B2 - Height adjustment device for mobile agricultural machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle height adjusting device for a mobile agricultural machine. 2. Description of the Related Art In a transplanter for seedlings such as vegetables and sweet potatoes (sweet potatoes), the height of the body from the ground surface, that is, the vehicle height is adjusted to make the planting depth of the seedlings uniform. Also, the depth of the chemical injection rod driven into the ground is adjusted by changing the vehicle height in the soil disinfection machine.
In such a general mobile agricultural machine, the vehicle height is changed by moving the front wheel supporting rod and the rear wheel supporting rod rotatably mounted on the body by a hydraulic cylinder to change the interval between the front wheel and the rear wheel. When the front wheel and the rear wheel are close to each other and the interval is narrow, the vehicle height increases. However, the hydraulic cylinder has problems in that it is difficult to finely adjust the vehicle height, and it is difficult to precisely adjust the vehicle height. Further, if the hydraulic cylinder is stopped for a long time, oil leaks and the vehicle height gradually decreases. [0003] Accordingly, the present invention is to improve the disadvantages of such a hydraulic cylinder, to accurately adjust the height of the mobile agricultural machine with a simple operation, and to stabilize the height. Provide a vehicle height adjustment device that maintains the vehicle height. According to the present invention, a slide plate guided to move up and down is connected to one end of a variable rod of a vehicle height changing hydraulic cylinder, and the slide plate slit is formed.
Adjuster fixed to the nut block in the slit
To move the slide plate up and down within the range of the slit.
To Furthermore, the screw rod is inserted into the nut block, and the nut block is provided movably along the screw rod. And by moving the position of the nut block it defines the bottom dead center of the slide plate by the screw rod. An embodiment of the present invention will be described with reference to the accompanying drawings, taking a seedling transplanter as an example. FIG. 1 is a detailed side view of a main part of the transplanter of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a side view showing a state where the height of the transplanter of the present invention is increased. The transplanter 1 supports a body 4 by front left and right front wheels 2 and rear left and right rear wheels 3. A hydraulic device 35 and a fuel tank 34 are provided at the front of the body 4, and an engine 5 and a transmission 6 are provided at substantially the center of the body 4. An implantation mechanism 7 is provided in the center of the rear part of the body 4. The traveling of the transplanter 1 is performed by transmitting the output of the engine 5 to the rear wheel 3 via a power transmission mechanism (not shown) built in the transmission 6 and the chain case 13. A pair of left and right swing shaft supports 8 is attached to the lower surface of the body 4 at predetermined intervals in parallel with the traveling direction, and the swing shaft 9 is rotatably inserted into the pair of left and right swing shaft supports 8. The swing shaft 9 is arranged at right angles to the traveling direction. A pair of front wheel support rods 10 are attached to both ends of the swing shaft 9 in parallel, and the front ends of the front wheel support rods 10 project obliquely downward and forward, and the front wheels 2 are rotatably supported at the respective ends. Further, a pair of connecting arms 11 are attached to and fixed to the swing shaft 9 in parallel with the front wheel supporting rod 10 by a predetermined angle. A drive shaft 12 is provided at a lower rear portion of the body 4 via an engine 5 and a transmission 6, and the drive shaft 12 is rotatably mounted at right angles to a traveling direction. The swing arm 14 is concentrically mounted on both ends of the drive shaft 12, and is held rotatably with the drive shaft 12 through a bearing (not shown). A chain case 13 also serving as a rear wheel support rod is integrally attached to the other end of the swing arm 14, a drive shaft 12 is protruded into the chain case 13, and a drive sprocket (not shown) is integrally attached to the tip of the drive shaft 12 to drive. from the side sprocket via a drive chain (not shown) coupled to the wheel-side scan <br/> Puroke Tsu preparative (not shown), and accommodates the connecting portion in the chain case 13, the wheel-side sprocket The rear wheel 8 is connected to the rear wheel 8. By the rotation of the drive shaft 12 ,
Drive sprocket, drive chain, wheel side sprocket <br/> preparative rotates the rear wheel 3 via a rear wheel power of the engine 3
Tell FIG. 4 is a perspective view showing details of the vehicle height adjusting mechanism of the present invention, and FIG. 5 is an explanatory diagram of the operation of the vehicle height adjusting mechanism. A drive wheel link 15 and a guide wheel link 16 are formed integrally by welding on the outer periphery of a swing arm 14 covering the drive shaft 12 and projecting at a fixed angle to the opposite side to the chain case 13. A connecting arm 11 fixed to the swing shaft 9 from a tip end of the guide wheel link 16 via a connecting rod 17
Connect to As shown in FIG. 1 , a front wheel support rod 10 is integrally attached to both ends of the swing shaft 9, and the front wheel 2 is rotatably supported at the tip of the front wheel support rod 10. The vehicle height adjusting mechanism is provided with a guide plate 18 having one end fixed on the body 4 and inclined rearward at a predetermined angle. The guide plate 18 is formed by bending both sides of a plate material having a rectangular hole in the center of which is provided with a rectangular hole through which the hook piece 27 is slidably inserted into a U-shaped cross section, and holding the slide support 19 between the U-shaped cross sections. Then, a lid 20 is provided at the upper end thereof for sealing, and a bearing 22 for supporting the screw rod 21 is provided at the center of the lid 20, and the screw rod 21 is inserted into the guide plate 18 through the bearing 22 from above. The adjustment handle 23 is mounted on the upper part of the screw rod 21 protruding outside from the lid 20. The slide plate 25 has a U-shaped cross section in accordance with the opening of the upper part of the guide plate 18, and the slide support portions 1 are provided on both sides thereof.
9 are formed with a slide piece 25a to be fitted therein, and a slit 26 having a predetermined length in the longitudinal direction is formed on the upper surface. A hook piece 27 extends downward from the inside of the slide plate 25 near the lid 20.
Is fixed, and its tip protrudes downward through a rectangular hole of the guide plate 18. Below the slit 26 of the slide plate 25, a balancing arm 31 is pivotably mounted via an arcuate slit 31a. The balancing arm 31 has an arcuate slit 31a at the center and connection holes 31b at symmetrical positions at both ends. Nut block 24 in guide plate 18
And the upper surface of the nut block 24 is
The slide plate 25 is inserted into the guide plate 18 and slidably held. The adjuster 28 is fixed to the nut block 24 through the slit 26 of the slide plate 25, and the slide plate 25 and the nut block 2 are fixed within the range of the slit 26.
4 is slidably held. The nut block 24 is screwed into the tip of the screw rod 21, and the slide plate 25 slides along the slide support 19 following the nut block 24 by the rotation of the screw rod 21. A vehicle height changing hydraulic cylinder 29 is disposed below the guide plate 18 in parallel with the guide plate 18, and one end of the hydraulic cylinder 29 is rotatably mounted on the body 4.
0 is connected to the hook 27 of the slide plate 25.
One end of the connecting rod 32 is connected to the connecting hole 31b of the balancing arm 31, and the other end of the connecting rod 32 is connected to the swing arm 1
4 drive wheel link 15. FIGS. 4 and 5 show a configuration connected to one connection hole 31b of the balancing arm 31, and an equivalent configuration is provided symmetrically in the other connection hole 31b of the balancing arm 31. With the above configuration, when increasing the vehicle height of the transplanting machine 1, the vehicle height changing hydraulic cylinder 29 is driven by the hydraulic device 35 to push out the movable rod 30, and the hook 2
7 is moved upward by moving the slide plate 25 upward.
You. At this time, the slide plate 25 is loosened on the slide plate 25.
Along the adjuster 28 engaged and fixed to the nut block
It can be moved upward within the range of the slit 26 ,
The balance arm 31 attached to the slide plate 25 is pulled up, and the drive arm link 15 of the swing arm 14 is pulled up by the balance arm 31 to rotate the swing arm 14 around the drive shaft 12. The rotation of the swing arm 14 rotates the chain case 13 forward, and pulls the drive wheel 12 provided at the tip forward. At the same time, the guide wheel link 16 is rotated to connect the connecting arm 1 via the connecting rod 17.
1 is rotated around the swing shaft 9 in the opposite direction, and the front wheel support rod 10 is rotated.
Pull the front wheel 2 attached to the rear. In this state, the interval between the front wheel 2 and the rear wheel 3 is reduced, the body 4 is pushed upward, and the height of the transplanter 1 is maintained at a high position. As shown in FIGS. 1 and 3, the distance between the front wheel 2 and the rear wheel 3 is reduced (A
To B), heavy objects such as the fuel tank 34, the engine 5 and the hydraulic device 35 mounted in front of the transplanter 1 are drawn to the rear wheel 3 side. The lever 3 is easily lifted upward with a lever by using the fulcrum 3 as a fulcrum. As described above, by operating the vehicle height changing hydraulic cylinder 29, the distance between the front wheel 2 and the rear wheel 3 can be reduced to increase the vehicle height, and by reducing the oil pressure, the vehicle can easily return to its original state by its own weight. Since it can be returned, it is possible to easily cope with a change of direction or a movement of the ridge during the transplanting operation without requiring extra labor. Further, if the hydraulic pressure of the vehicle height changing hydraulic cylinder 29 is maintained, the vehicle height of the transplanting machine 1 can be maintained at a high level. In the case of a long-distance movement or the like, the screw 21 is rotated by the adjustment handle 23, and the nut block 24 is pulled up to the position of the slide plate 25 and fixed.
Bottom dead center of slide plate that moves up and down within the range of slit 26
By adjusting the vehicle height , the vehicle height can be kept high. At this time, since the vehicle is already supported by the vehicle height changing hydraulic cylinder 29, the force required for directly rotating the screw rod 21 is lighter than when the vehicle height is increased by the screw rod 21 alone, and the adjusting handle 23 can be easily mounted. Can be rotated. According to the present invention, the vehicle height can be easily raised by pulling the front wheel and the rear wheel toward each other through the link mechanism by the vehicle height changing hydraulic cylinder. In this state, the adjusting handle is operated. Up within the slit by nut block
By defining the bottom dead center of the sliding plate that moves down,
It can be stably held. Also, after the slide plate is moved upward by the vehicle height changing hydraulic cylinder and the vehicle height is held at a high position, while the position of the nut block is moved by the adjustment handle to define the bottom dead center of the slide plate ,
Lower the hydraulic pressure of the vehicle height changing hydraulic cylinder and lower the slide plate.
, And supported by the nut block, it is possible to easily and stably hold the optimum vehicle height for the transplanting operation.
In either case, the height change hydraulic cylinder
By moving the guide plate up and down, the rotational load of the adjustment handle can be reduced and the operation can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a detailed side view of a main part of an implanting machine of the present invention. FIG. 2 is a plan view of the transplanter of the present invention. FIG. 3 is a side view showing a state where the vehicle height of the transplanter of the present invention is increased. FIG. 4 is a perspective view showing details of a vehicle height adjusting mechanism of the present invention. FIG. 5 is an operation explanatory view of the vehicle height adjusting mechanism of the present invention. [Description of Signs] 1 Transplanter 2 Front wheel 3 Rear wheel 4 Body 5 Engine 6 Transmission 7 Implantation mechanism 8 Swing shaft support 9 Swing shaft 10 Support rod 11 Connecting arm 12 Drive shaft 13 Chain case 14 Swing arm 15 Drive Wheel link 16 Guide wheel link 17 Connecting rod 18 Guide plate 19 Slide support 20 Lid 21 Screw rod 22 Bearing 23 Adjustment handle 24 Nut block 25 Slide plate 25a Slide piece 26 Slit 27 Hook piece 28 Adjuster 29 Vehicle height change hydraulic pressure Cylinder 30 Moving rod 31 Balancing arm 31a Arc-shaped slit 31b Connecting hole 32 Connecting rod 33 Operating handle 34 Fuel tank 35 Hydraulic device

Claims (1)

(57) Claims 1. A front wheel support rod for supporting the front wheel axle and a rear wheel support rod for supporting the rear wheel axle are connected by a link, and the front wheel support rod or the rear wheel support rod is connected. In a mobile agricultural machine in which the front wheel supporting rod and the rear wheel supporting rod are turned in opposite directions by a vehicle height changing hydraulic cylinder connected to either one of them, and the body is raised or lowered by approaching or separating the front wheel and the rear wheel. A slide plate guided to move up and down is connected to one end of the variable rod of the vehicle height changing hydraulic cylinder , a slit is formed in the slide plate , and a nut block is formed in the slit.
With the adjuster fixed to the
The de plate is vertically movable, further, the nut block by inserting a threaded rod movable along the nut block to the screw rod, Thus under the slide plate by moving the position of the nut block by screw rod A height adjusting device for defining a dead point.