JPS6134767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a working machine lifting device for raising and lowering a working machine in a mobile agricultural machine when traveling on a road or for adjusting the working height.

The work equipment of mobile agricultural machinery has a support member that supports it pivoted to the main body of the machine, and by swinging the support member using a hydraulic device, the work equipment swings as a unit. has been done. This swinging motion adjusts the working height of the work equipment, and when driving on the road, the work equipment is moved to a higher position than the working position to prevent it from colliding with obstacles and being damaged. need to rise to.

However, when driving on the road, if the work equipment is raised too high, there is a risk of the machine base tipping over, and in the case of a combine harvester, the direction of the headlight installed on the reaper may be too far away. Therefore, it is necessary to maintain the working equipment at an appropriate height that is higher than the working position but not too high, and the height of the working equipment is regulated by the Special Small Vehicle Law. Therefore, in the past, alignment marks were set and used as a guide to adjust the vertical position of the work equipment. I couldn't have expected it.

The present invention has been made in view of the above points, and includes a main switch that closes a circuit in conjunction with the displacement operation of a member that is displaced when traveling on the road, and a main switch that closes a circuit in conjunction with the displacement operation of a member that is displaced when traveling on the road. A switch that operates to lower the work equipment when the machine is about to exceed the allowable upper limit position while traveling, and a switch that operates to raise the work equipment when the machine is about to exceed the allowable lower limit position are installed. By configuring the work equipment to automatically hold it at a predetermined height after the transition, it is possible to prevent the work equipment from colliding with obstacles due to descending too far, and to prevent the machine from falling over or from illumination of the headlight due to rising too high. The purpose of the present invention is to provide a working machine lifting device for a mobile agricultural machine that is designed to prevent such problems.

Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

This embodiment shows an example in which the present invention is implemented in a combine harvester. Fig. 1 is a side view of a combine in which the present invention is implemented, Fig. 2 is a side view of a reaping and lowering device, Fig. 3 is an explanatory diagram of the operation, and Fig. 4 is a hydraulic piping diagram, and Figure 5 is an electrical circuit diagram. In the figure, a running section 2 of a combine harvester 1 includes a pair of left and right running crawlers 3, and a threshing machine 5 including a threshing device is mounted on a running frame 4 that connects these crawlers. and,
A pilot seat provided on the side of the threshing machine 5 (not shown)
An operating device 8 equipped with a main gear shift lever 6, a sub gear shift lever 7, etc. is provided in front of the vehicle, and the traveling speed is changed in two stages by operating the width shift lever 7.
The changed speed is further configured to be changed in three stages by operating the main speed change lever 6.

On the other hand, in front of the threshing machine 5, a reaper, generally designated by the reference numeral 9, is disposed. 11, a raising device 12 which raises the fallen grain culm by its rear, a clipper-shaped cutting blade 13 which cuts the root part of the erected grain culm, and directs the cut grain culm to the threshing machine 5. The grain culm conveying device 14 and the like are provided.

The reaper 9 is supported as a whole by a four-bar link so as to be swingable. That is, the reaping frame 15 is integrally formed with the weeding rod 10.
The upper end is pivoted to the tip of a support lever 16 that is pivotally supported to the front end of the threshing machine 5, and a suspension arm 17 that pivots the rear end of the weeding rod 10. The upper end of the bracket 18 is pivotally supported at the front end of a bracket 18 attached to the front end of the traveling frame 4. A hydraulic cylinder 19 is provided between the suspension arm 17 and the traveling frame 4, and by expanding and contracting the hydraulic cylinder 19, the suspension arm 17 swings, and the four sections including the reaping frame 15 and the support lever 16 The entire reaping machine 9 is configured to swing due to the link movement of the links.

Therefore, the configuration of the reaping and lowering device including this hydraulic cylinder 19 will be explained. That is, the hydraulic cylinder 19 is attached with a pair of solenoid valves 20 and 21 each having a solenoid SOL ₁ and a solenoid SOL ₂ , and the solenoid valve 20 is operated via an unload valve 22 and a hydraulic pump 23. The solenoid valve 21 is connected to an oil tank 24, and the solenoid valve 21 is connected to an oil tank 25. The solenoids SOL ₁ and SOL ₂ of these solenoid valves 20 and 21 are connected by a manual circuit 26 shown in FIG.
By activating SOL ₁ , hydraulic cylinder 1
9 extends, the suspension arm 17 rotates clockwise in FIG. 2 to raise the reaper 9, and the solenoid
By activating SOL ₂ , hydraulic cylinder 1
9 is retracted, the suspension arm 17 is rotated counterclockwise, and the reaper 9 is lowered.

Furthermore, an automatic control circuit 28 is provided for the solenoids SOL ₁ and SOL ₂ to control their operation when driving on the road.
is connected. That is, the suspension arm 1
A pair of cams 3 that rotate together with the swinging of the suspension arm 17 are mounted on a pivot shaft 29 that pivots the suspension arm 17.
0 and 31 are provided so that the phase can be adjusted freely,
Further, a pair of switches SW ₁ and SW ₂ are provided on the bracket 18 side, and the contacts thereof are closed when the cams 30 and 31 rotate to face the large diameter portions of the cams, respectively. Furthermore, the sub-shift lever 7, which is shown as an example of a member that is displaced when transitioning to the road driving state, is provided with a main switch SW ₃ whose contacts are closed when the sub-shift lever 7 is rotated to the high-speed side. . Then, as shown in Figure 5, switch
SW ₁ and SW ₂ are solenoids SOL ₁ and SOL ₂ respectively
Main switch SW ₃
is provided in the main circuit between switches SW ₁ and SW ₂ and the power supply, so that the circuit will not be closed even if switches SW ₁ and SW ₂ are closed unless main switch SW ₃ is closed. It is configured. Therefore,
The relative positions of the cams 30 and 31 and the switches SW ₁ and SW ₂ will be explained. As mentioned above, when traveling on the road, it is necessary to raise the reaper 9, and the upper and lower limit positions of the suspension arm 17 at this time of raising are set as shown by chain lines 17A and 17B in FIG. Ru. And Switch SW ₂ is
As shown in FIG. 3a, when the cam 30 rotates in the direction of arrow A due to the swinging of the suspension arm 17 and reaches the upper limit position 17A, the starting end of the large diameter portion of the cam 30 and the contact point face each other. Its position is set so that it closes. Further, as shown in FIG. 3b, the cam 31 of the switch SW ₁ rotates in the direction of the arrow B due to the swinging of the suspension arm 17, and moves to the lower limit position 17B.
The position is set so that the starting end of the large diameter portion of the cam 31 and the contact point face each other and close when the contact point reaches .

The operation of the reaping and lowering device configured as above will be explained. First, during reaping work, it is necessary to adjust the cutting height by the cutting blades 13 depending on the conditions such as dryness and humidity in the field, and for this purpose, the reaping up and down lever 27 is operated to move the reaping machine 9 up and down. The rotation adjustment range of the arm 17 is in the vicinity of the position shown by the solid line in FIG. 2, and does not reach the position shown by the reference numeral 17B, and the auxiliary gear shift lever 7 is not rotated toward the high speed side. So, main switch
If SW ₃ is open, the circuit will not be closed even if, for example, switch SW ₁ is closed by the large diameter part of cam 31, and the reaping movement up and down can only be done manually.

When driving on the road, the reaping up and down lever 27
After operating the reaper 9 to raise the reaper 9 until the suspension frame 17 reaches near the position 17A in Fig. 2, engage the travel clutch and rotate the sub-shift lever 7 to the high speed side to raise the machine to a high speed. Let it run. This closes the main switch SW ₃ and enables the automatic control. For example, when the mowing lift position is too low and the suspension arm 17 is lower than the position indicated by 17B, the switch SW ₁ closes the main switch SW 3 and enables the automatic control to operate. Since it corresponds to the diameter part, the contact is closed.
Therefore, the solenoid SOL ₁ is actuated and the hydraulic cylinder 19 is extended by the solenoid valve 20, so that the reaper 9 is raised until the suspension arm 17 is located between 17A and 17B. and,
The raising of the reaper 9 is stopped at a position corresponding to the small diameter portion of the cams 30, 31 so that the contacts of both switches SW ₁ and SW ₂ are opened, and the reaper 9 is held at a predetermined height. Further, when the reaping raising position is too high and the suspension arm 17 is higher than the position indicated by 17A, the switch SW ₂ corresponds to the large diameter portion of the cam 30, so that the contact is closed. Therefore the solenoid
SOL ₂ is activated and the hydraulic cylinder 19 is contracted by the solenoid valve 21, so that the reaper 9 is lowered until the suspension arm 17 is located between 17A and 17B. And both switches SW ₁ ,
Cam 30,3 so that SW ₂ has its contacts opened.
The lowering of the reaper 9 is stopped at a position corresponding to the small diameter portion 1, and the predetermined position is maintained. Then, even if the oil pressure decreases and the reaper 9 descends while driving on the road, when the suspension frame 17 reaches 17B, switch SW ₁ is closed and the reaper 9 rises, maintaining the predetermined height. be done.

In this embodiment, the auxiliary shift lever 7 is used as an example of the member that is displaced to close the main switch SW ₃ when traveling on the road, but the main shift lever 6 may also be used, or both shift levers 6 may be used. ,7
main switch SW ₃ when both are on the high speed side.
may be closed. Further, a main switch SW ₃ may be provided on the cutting rotation side of the reaping clutch or the threshing clutch, which are always disconnected when traveling on the road, to close them. In addition, the reaper 9 is in a low position during reaping work, and is raised when traveling on the road, so the mace switch SW ₃ is activated just before the reaper 9 rises and its suspension arm 17 reaches 17B in FIG. In order to close the main switch SW 3, the main switch SW ₃ may be disposed near a member that is displaced as the reaper 9 rises, and the contact may be closed by the contact of the member.

In addition, in this embodiment, the cams 30 and 31 are used as members that are displaced with the vertical movement of the reaper, and an example is shown in which the cams 30 and 31 are provided at the pivot portion of the suspension arm 17.
The present invention is not limited to this, and any member may be used as long as it is a member that displaces with the vertical movement of the reap, such as providing a cam on the pivot portion of the reaping frame 15 or the support lever 16, or providing an uneven portion directly on these members. . Further, in this embodiment, a combine harvester is used as an example of a mobile agricultural machine, and a reaper is used as an example of a working machine, but the present invention can also be applied to, for example, a rotor up-and-down device of a tiller.

As is clear from the above description, according to the present invention, in a working machine lifting device for a mobile agricultural machine, there is provided a main switch that closes a circuit in conjunction with the displacement operation of a member that is displaced when transitioning to on-road driving; A switch in the circuit that operates to lower the work equipment when the work equipment is about to exceed the upper limit position when traveling on the road, and a switch that operates to lower the work equipment when the work equipment is about to exceed the lower limit position when traveling on the road. By providing a switch to raise the machine, the machine will always maintain a predetermined height when traveling on the road, so it will not fall too low and collide with an obstacle, and it will also prevent the machine from climbing too high and colliding with an obstacle. This prevents the stand from tipping over and the headlight illumination position from becoming too far away.
Extremely safe road driving can be ensured.

[Brief explanation of the drawing]

1 to 5 show a working machine lifting device for a mobile agricultural machine according to the present invention, FIG. 1 is a side view of a combine harvester implementing this, FIG. 2 is a side view of a reaping lifting device, and FIG. FIG. 4 is a hydraulic piping diagram, and FIG. 5 is an electric circuit diagram. 1... Combine harvester, 6... Main gear shift lever, 7...
...Sub-shift lever, 9...reaper, 17, 17A,
17B...Suspension arm, _SW1 , _SW2 ...Switch, _SW3 ...Main switch.

Claims (1)

[Claims] 1. A switch that opens and closes a circuit in conjunction with the displacement of a member that displaces with the vertical movement of the work equipment, and lowers the work equipment at the upper limit permissible position of the work equipment when traveling on the road, and lowers the lower limit of the work equipment when the work equipment is at the lower limit position. and a main switch that closes the circuits of both the switches in conjunction with the displacement operation of a member that is displaced when moving on the road. Device.