JP2775901B2 - Combine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine in which a mowing unit is provided at the front of a body having a traveling device so as to be movable up and down.

(Prior art)

2. Description of the Related Art Conventionally, in some combine harvesters, the ascending and descending speed of a reaping unit is changed in accordance with a shift in a traveling speed. This is because, when performing the harvesting work, if the traveling speed is increased, the climbing speed of the cutting section is also increased in connection with this,
This is to prevent the tip of the mowing part from protruding into a ridge or a convex part of the ground.

Needless to say, the raising and lowering of the mowing portion is controlled by a manual lever or by an automatic control device that measures the height of the mowing portion from the ground with a mowing height sensor and keeps the height of the mowing portion constant.

[Problems to be solved by the invention]

There is a limit to the speed at which the mowing unit can move up and down. In general, the up and down movement of the reaping unit of the combine uses a hydraulic cylinder as a drive mechanism, and the expansion and contraction speed of the hydraulic cylinder is determined by the flow rate of hydraulic oil sent from the hydraulic pump of the combine per unit time. Further, even when the electric motor is used as a driving mechanism, the rotation speed and rotation torque of the electric motor are determined by the amount of current and voltage.

In short, in a drive mechanism that moves the mowing unit up and down, there is naturally a physical limitation in changing the drive speed. For this reason, there is also a limit to increasing the ascent / descent speed of the mowing part in response to high-speed running during mowing and threshing work. In some cases, the tip of the mowing part may protrude into a ridge or a field scene.

[Means for solving the problem]

The present invention employs the following technical means in order to solve the above-mentioned problems.

That is, in the combine which is configured so that the traveling speed of the body 1 and the ascent / descent speed of the reaper 2 mounted on the body 1 so as to be able to move up and down are proportionally increased and decreased,
When the height of the reaper 2 is less than a predetermined height and the vertical speed of the reaper 2 reaches the high-speed limit, a traveling speed restricting means is provided that cannot increase the speed beyond the aircraft traveling speed at this time. And a combine.

[Functions and Effects of the Invention]

By automatically controlling the cutting height by a cutting height sensor or operating a manual lever, the culm to be planted in the field is cut, threshed and harvested while the ground height of the cutting unit is adjusted to be substantially constant.

When harvesting cereals with a relatively small load for cutting and threshing, the traveling speed of the combine is increased to perform high-speed reaping to increase the efficiency of the work.

At this time, according to the present invention, at the time of low mowing, when the ascending / descending speed of the mowing portion reaches the high speed limit, the traveling speed of the combine is restricted so as not to be increased any more.

As described above, when it becomes impossible to follow the unevenness of the ground by increasing the mowing lifting speed, the state in which the ground height of the mowing portion can be smoothly adjusted by regulating the running speed of the aircraft is maintained, and Preventing the tip from rushing into a ridge or a field scene can improve work efficiency.

Further, when the height of the mowing portion is equal to or more than a predetermined value, that is, when performing high mowing work, since the tip of the mowing portion does not rush, even if the lifting speed of the mowing portion reaches the high-speed limit, The work can be performed while increasing the body running speed. This also improves work efficiency.

〔Example〕

One embodiment of the present invention will be described in detail for a normal combine.

Above the endless belt traveling device 3, a threshing device 4, a grain tank 5, and a control section 6 are mounted and provided. To the front side of the threshing device 4, a mowing unit 2 having a scraping reel 7, a weeding device 8, a cutting blade 9, a culm collecting and feeding device 10, and the like are connected by a transport elevator 11 so as to be rotatable up and down. Reference numeral 12 denotes an ultrasonic cutting height sensor provided below the cutting unit 2, and reference numeral 13 denotes a hydraulic cylinder that moves the cutting unit 2 up and down. 14 is the endless traveling device 3
The transmission case is configured to use a hydraulic motor 15 as a drive source and detect a rotation speed, that is, a traveling speed by an electromagnetic pickup sensor. Further, the control section 6 is provided with a reaping up / down manual operation lever 16, a traveling speed change lever 17, and the like.

A hydraulic circuit for raising and lowering the cutting unit 2 shown in FIG. 2 will be described. 18 is a pressure oil tank, 19 is a hydraulic pump, 20 is an electromagnetic switching valve, 21 is a pilot check valve, 22 is a variable throttle valve,
Reference numeral 13 denotes a hydraulic cylinder that moves the mowing unit 2 up and down. Although the oil supply amount of the hydraulic pump 19 is always constant, the expansion and contraction speed of the hydraulic cylinder 13 can be adjusted by adjusting the variable throttle valve 22.

When the cutting vertical operating lever 16 is tilted backward, the solenoid 23 of the electromagnetic switching valve 20 is excited, and the pressure oil from the hydraulic pump 19 is blocked by the block A and the pilot check valve 2.
1. The fluid flows into the hydraulic cylinder 13 through the variable throttle valve 22. As a result, the hydraulic cylinder 13 is extended, and the mowing unit 2 is raised.

When the cutting vertical operation lever 16 is tilted forward, the hydraulic cylinder 13 is shortened, and the cutting unit 2 is lowered.

When the cutting height control is performed, the ultrasonic cutting height sensor 12 measures the distance to the field scene by turning on the automatic switch, and expands and contracts the hydraulic cylinder 13 so as to maintain the distance at the set value. This control method itself is a conventionally known method. When the mowing unit 2 becomes lower than the set value, the solenoid 23 of the electromagnetic switching valve 20 is excited by the output from the controller. Thereby, the pressure oil from the hydraulic pump 19 flows into the hydraulic cylinder 13 through the block A, the pilot check valve 21, and the variable throttle valve 22, and the hydraulic cylinder 13 is extended,
The reaper 2 is raised. Conversely, when the mowing unit 2 becomes higher than the set value, the solenoid 24 of the electromagnetic switching valve 20 is excited by the output from the controller. This allows the hydraulic cylinder
The pressure oil in 13 is variable throttle valve 22, pilot check valve 21,
It is returned to the pressure oil tank 18 through the block B. As a result, the hydraulic cylinder 13 is shortened, and the mowing unit 2 is lowered.

Further, the opening degree of the variable throttle valve 22 is made proportional to the traveling speed by the adjustment drive mechanism 25. When the traveling speed is increased by operating the traveling speed change lever 17, this is detected by the electromagnetic pickup sensor and is input to the controller.
The opening of the variable throttle valve 22 is increased by the output from the controller. This allows the hydraulic cylinder
The flow rate of the pressurized oil flowing into the unit 13 per unit time increases, and as a result, the rising speed of the cutting unit 2 increases. Similarly, the descent speed of the mowing unit 2 is increased.

When the opening degree of the variable throttle valve 22 is maximized, the ascent speed of the reaper 2 cannot be further increased.

The traveling speed when the height of the variable throttle becomes maximum when the height of the cutting unit 2 by the cutting height sensor 12 is equal to or less than a predetermined height is inevitably determined. At this time, even if the traveling speed change lever 17 is further operated to increase the speed, the traveling speed cannot be further increased because the traveling speed regulating means of the controller regulates the increase in the rotation speed of the hydraulic motor 15. .
As a result, the traveling speed cannot be controlled by the ascending / descending speed of the reaper 2, and it is possible to prevent the traveling speed from becoming so high as to cause a rush.

When it is detected that the height of the mowing part 2 is higher than the predetermined height, the traveling speed restricting means does not operate even if the opening degree of the variable throttle valve 22 is maximized. For this reason, at the time of high mowing, the mowing work can be performed by further increasing the running speed.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side view of the combine, FIG. 2 is a hydraulic circuit diagram, and FIG. DESCRIPTION OF SYMBOLS 1 ... body, 2 ... mowing part 3 ... endless belt type traveling device, 4 ... threshing device 5 ... grain tank, 6 ... operating part 7 ... scraping reel, 8 ... weeding device 9 … Cutting blade, 10… Grain culm conveyer 11 …… Transport elevator, 12… Cutting height sensor 13 …… Hydraulic cylinder 14 …… Mission case, 15 …… Hydraulic motor 16 …… Moving up / down manual operating lever 17: Travel shift lever, 18: Pressure oil tank 19: Hydraulic pump, 20: Solenoid switching valve 21: Pilot check valve 22: Variable throttle valve, 23: Solenoid A: Block, 24 ... Solenoid B Block 25 Adjustment drive mechanism

Claims (1)

(57) [Claims] 1. A combine constructed in such a manner that a traveling speed of a machine body 1 and an ascending / descending speed of a cutting unit 2 mounted on the machine body 1 so as to be able to move up and down are proportionally increased and decreased.
When the height of the reaper 2 is less than a predetermined height and the vertical speed of the reaper 2 reaches the high-speed limit, a traveling speed restricting means is provided that cannot increase the speed beyond the aircraft traveling speed at this time. A combine characterized by: