JPH0446495Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a working machine up-and-down device for an elevated work vehicle that performs ridge work for planting tobacco seedlings and the like.

Conventional technology Conventionally, as a mechanism for vertically moving the work equipment used in elevated work vehicles, a threaded rod that can rotate forward and reverse is attached to the main tower installed upright on the elevated work vehicle. Generally, a working machine is connected to the lower end of a threaded rod. By rotating the threaded rod, the working machine is moved up and down by the thread pitch.

Further, in machine tools and the like, slide-type precision vertical shifters with a liner are widely used.

Problems that the invention aims to solve: Vertical movement devices that rotate a threaded rod to move a working machine up and down require high precision in the processing of the threaded rod and the threaded rod receiver into which the threaded rod is screwed. If the accuracy is poor, it will be impossible to move the work machine up and down. Further, when a large force is applied to the working machine, the threaded rod is likely to be bent or deformed, and if the threaded rod is bent or deformed, it becomes impossible to move the working machine up and down. Furthermore, running out of grease or adhesion of dust to the threaded rod may cause a seizure phenomenon, causing the threaded rod to become locked and making it impossible to move the working machine up and down.

Furthermore, slide shifters with a liner that are widely used in machine tools and the like cannot absorb fluctuating loads acting on the working machine. Furthermore, problems of seizure may occur due to adhesion of dust, lack of oil, etc., and the cost is also high.

Means for Solving the Problems A working machine is arranged approximately in the center of the elevated working vehicle in the longitudinal direction, and a main tower extending upward is fixed to the elevated working vehicle. A plurality of roller supports are arranged and fixed in the vertical direction on the main tower, and a pair of front and rear rollers are rotatably attached to these roller supports. A sub-tower connected to the vertical movement drive section is inserted between the pair of rollers so as to be slidable in the vertical direction, and a working machine is connected to the lower end of the sub-tower.

Operation The sub-tower is moved up and down while being held between rollers by the up-and-down drive unit, and the work equipment is also moved up and down together. When inserting the subframe between the rollers, there may be a gap between the subframe and the rollers, and high dimensional accuracy is not required. Further, when a large force is applied to the working machine, the subframe is pressed against the rollers in response to the force, but the vertical movement is performed without interfering with the vertical movement function.

Embodiment An embodiment of this invention will be described based on the drawings. First, an engine 2 is mounted on the rear of a body 1 of a four-wheeled elevated work vehicle that travels on the ground, and a transmission case 3 is fixed to the bottom of the engine 2. 4
Fixed. An axle 5 extending in the left-right direction is provided at the lower end of the transmission case 3;
Upper end portions of a pair of left and right transmission cases 6 are connected to both ends of the axle 5 so as to be rotatable about the axis of the axle 5 . A rotating shaft 7 connected to the axle 5 via a sprocket and a pulley (not shown) is provided at the lower end of the transmission case 6, and a rear wheel 8 is connected to the rotating shaft 7.

A main tower 9 extending upward is fixed to the front end of the chassis 4, and a step 10 extending forward is fixed to the lower end of the main tower 9. Then, a panel cover 11 and a sheet 12 are attached on the step 10, and further,
A brake pedal 13 and a clutch pedal (not shown) are arranged. On the upper surface of the panel cover 11, a handle 14, an accelerator lever 15,
A hydraulic lever 16 is arranged and
A front wheel steering device 19 is provided below the steering wheel 10 for steering the front wheels 18 in an arbitrary direction via the front wheel steering device 17 as the handle 14 is rotated.

Next, a pair of upper and lower roller supports 21, 21 are fixed to the main tower 9, with a pair of left and right support plates 20 facing each other. Each support plate 20 is formed with a pair of mounting holes (not shown) in the front and back direction, and each of the roller supports 21 and 22 has a bolt 23 inserted into the mounting hole and a nut screwed onto the bolt 23. 24, a roller 25 is rotatably attached. A pair of opposing rollers 2
5 are arranged at a predetermined interval, and a sub-tower 26 is inserted between these rollers 25 approximately parallel to the main tower 9 so as to be slidable in the vertical direction. A rearwardly extending frame 27 is fixed to the lower end of the sub-tower 26, and an intercultivation rotary 28, which is a working machine including a transmission case, a rotor, a ridge shaper, etc., which will be described later, is connected and fixed to this frame 27. ing. First, a mission case 29 is fixed to the front part of the frame 27, and a hitch 30 is fixed to the rear end of the frame 27. A tilling shaft 31 extending in the left-right direction is provided at the lower end of the transmission case 29,
A rotor 32 is connected to the tilling shaft 31 by a connecting pin (not shown). A T-shaped bar 33 is inserted and fixed into the hitch 30 so as to be vertically adjustable, and a pair of left and right ridge shapers 34 are fixed to the lower end of the T-shaped bar 33.

Next, a subframe 35 is connected between the upper end of the main tower 9 and the rear part of the chassis 4, and is fixed to the subframe 35 and has a vertically movable drive unit fixed to the mounting stay 36. The upper ends of the hydraulic cylinders 37 are connected. This hydraulic cylinder 37 is arranged substantially parallel to the main tower 9, and the lower end of the hydraulic cylinder 37 is connected to a mounting stay 38 fixed to the upper end of the control transmission case 29.

A V-belt 42 is wound between the engine pulley 39 attached to the engine 2 and the machine pulley 40 attached to the transmission case 3 and is tensioned by a tension roller 41 to transmit power. . Further, a hydraulic pump 43 is fixed to the chassis 4, and a hydraulic pump 43 is fixed to the chassis 4.
3 and the engine 2 are connected to a V-belt 4 for power transmission.
Connected by 4. Note that a hydraulic pipe (not shown) is connected between the hydraulic pump 43 and the hydraulic cylinder 37 via a valve (not shown). Further, a propeller shaft 45 for power transmission is connected between the output shaft (not shown) of the mission case 3 and the input shaft (not shown) of the mission case 29.

Next, a multi-sheet covering device 50 consisting of a multi-sheet 46, a guide roll 47, a treading wheel 48, a soil covering disk 49, etc. is attached to the upper part of the T-shaped lever 33.

In such a configuration, when the aircraft 1 moves forward (in the direction of arrow a), the power from the engine 2 is transmitted to the transmission case 29 and the tilling shaft 31 via the propeller shaft 45, and the rotor 32 moves in the direction of arrow b. Rotate. As a result of this rotation, the soil on the ground surface is tilled and accumulated inside the transmission case 29, and the ridges are shaped by the ridge shaper 34 located behind the rotor 32.

On the other hand, the hydraulic pump 43 is rotated by the power from the engine 2, and the hydraulic cylinder 37 is expanded and contracted by switching the hydraulic lever 16. As the hydraulic cylinder 37 expands and contracts, the intercultivation rotary 28 vertically moves integrally with the frame 27 and the sub-tower 26. During the ridge filling work, the hydraulic cylinder 37 is extended to move the intercultivation rotary 28 downward, thereby causing the intercultivation rotary 28 to interfere with the ground surface. Further, when the ridge filling work is interrupted or when turning at the edge of the field, the hydraulic cylinder 37 is retracted to move the intercultivation rotary 28 upward and away from the ground surface. Note that the height of the ridges to be formed is adjusted by adjusting the amount of downward movement of the intermediate tillage rotary 28.

Here, during the ridge filling work, the ridge shaper 34
A rearward force acts on the sub-tower 26, and a rearward force (in the direction of arrow c) acts on the sub-tower 26 as shown in FIG. At this time, the upper side of the subframe 26 contacts the front roller 23 of the roller support 21 and the rear roller 23, and a certain gap is created between the subframe 26 and the rear roller 23. on the other hand,
The lower side of the subframe 26 is a roller support 22
A certain gap is created between the roller 23 on the rear side and the roller 23 on the front side. The subframe 26 moves up and down with a slight forward tilt relative to the main frame 9. Therefore, roller 2
The inter-tiling rotary 28 can be moved up and down without requiring high dimensional accuracy for the spacing between the three and the dimensions of the sub-frame 26 and the like. Note that if an excessive force is applied to the ridge shaper 34 or the like during work, the force in the direction of arrow c will also increase, but in that case, the contact force of the subframe 26 to the roller 23 will only increase, and the subframe The frame 26 and the intermediate tiller rotary 28 can be moved up and down without any problem.

If the machine stops running while moving uphill while performing ridge filling work on a slope, the ridge shaper 34 bites into the ground surface and the machine body 1 moves downward. Then, a force acts on the ridge shaper 34 and the subframe 26 in the direction of arrow d, as shown in FIG. At this time, the upper side of the subframe 26 comes into contact with the roller 23 on the rear side of the roller support 21, and a certain gap is created between the subframe 26 and the roller 23 on the front side. Also, subframe 2
The lower side of the roller support 22 contacts the roller 23 on the front side of the roller support 22, and a certain gap is created between the roller 23 on the rear side and the lower side of the roller support 22. And subframe 2
6 moves up and down with a slight backward tilt relative to the main frame 9.

Note that in this embodiment, the roller support 2
Although a pair of roller supports 1 and 22 are provided above and below, another roller support may be installed between these roller supports 21 and 22 as a reinforcement measure.

Effects of the invention Since this invention is configured as described above, it is possible to move the work machine up and down without requiring high dimensional accuracy of the subframe and the roller into which this subframe is slidably inserted in the vertical direction. In addition, even when a large force is applied to the work equipment, the contact force of the subframe against the roller increases, and the vertical movement function of the work equipment can be maintained without any problems. It is also simple and has the effect of reducing production costs.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a side view showing the ridge filling operation state, Fig. 2 is a plan view, Fig. 3 is a side view showing the state in which the intertilling rotary is raised, and Fig. FIG. 4 is an enlarged side view of the vertical movement mechanism, FIG. 5 is a plan view thereof, and FIGS. 6 and 7 are side views showing the state of contact between the subframe and the rollers. 9...Main tower, 21, 22...Roller support, 23...Roller, 26...Sub tower,
28...Intertillage rotary (working machine), 37...Hydraulic cylinder (vertical movement drive unit).

Claims (1)

[Scope of utility model registration request] In an elevated work vehicle having a four-wheel body, a work machine is disposed approximately in the center of the elevated work vehicle in the longitudinal direction, and a main tower extending upwardly is fixed to the elevated work vehicle, and the main tower is fixed to the main tower. A plurality of roller supports are arranged and fixed in the vertical direction, a pair of front and rear rollers are rotatably attached to these roller supports at a predetermined interval, and a sub-tower connected to a vertical movement drive unit is installed between the pair of rollers. 1. A working machine vertical movement device for an elevated working vehicle, characterized in that the working machine is inserted into the sub-tower so as to be slidable in the vertical direction, and the working machine is connected to the lower end of the sub-tower.