JPS62179302A - Running control mechanism of combine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a combine harvester that travels in farmland to harvest crops, and more particularly to a travel control mechanism for a combine that controls the engine speed depending on the travel state.

(b) Summary of the Invention The travel control mechanism for a combine harvester according to the present invention is designed to perform stable round travel and at the same time prevent a decrease in the processing accuracy of the threshing device. By providing a culm sensor that detects the presence or absence of a shell culm, and a companion prohibition means that prohibits traveling when the culm sensor detects a shell culm, it is possible to prevent the shell culm from remaining in the threshing device. This prevents the machine from running in a circular motion while the machine is running, and maintains the set rotational speed during reaping work.

(c) Prior art and its disadvantages In general, in reaping work using a combine harvester, as shown in FIG. be exposed. In this circular mowing, when there is no crop to be harvested in front of the combine harvester 31 and the direction of movement is changed, for example from the direction of arrow A to the direction of arrow B, the circular mowing at the set angle W2. W5 and straight running Wl, W3. W4. A traveling direction changing operation is performed in combination with W6. This is to ensure efficient direction change and to prevent uncut areas.

However, during such a traveling direction change operation, the round trip W2. At W5, large side resistance occurs in the traveling device, and the load acting on the engine increases. Such an increase in load may cause the engine speed to drop or stop, resulting in a decrease in the working efficiency of the combine.

For this reason, some conventional combine harvesters are equipped with a rotation speed control means for controlling the engine rotation speed to a rotation speed that maximizes the output of the load acting on the traveling device during traveling.

This prevents the rotational speed from decreasing during the round trip, and shortens the time required to change the direction of travel.

However, with conventional combine harvesters, reaching the end of the crop was detected by turning on/off the stock sensor located in front of the threshing device, so the direction of travel was changed while the culm remained in the threshing device. There were cases where the vehicle was moved and was driven around.

In order to maintain high processing accuracy of the threshing device, it is necessary to maintain the engine speed at a set rotation speed according to the reaping conditions of the crop variety, etc. When running starts, the engine speed is changed by the speed control means, which reduces the processing accuracy of the threshing device, resulting in poor sorting and increased losses.

(d) Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, the object of the present invention is to change the traveling direction accurately and in a short time by starting the round trip after detecting that the husk is gone in the threshing device. To provide a travel control mechanism for a combine harvester, which can reduce loss rate by performing reaping work in an optimal state while maintaining high processing accuracy of a threshing device.

(e) Structure and Effects of the Invention The traveling control mechanism for a combine harvester of the present invention has a rotation speed control means for controlling the load acting on the traveling device to a rotation speed that gives a maximum output during traveling of the combine. In the control mechanism, there is a culm sensor that is installed at the rear of the position facing the end of the milling cylinder in the conveying section that conveys the cut culm and detects the presence or absence of the culm, and this culm sensor detects the culm. In some cases, the vehicle is characterized by being equipped with a traveling prohibition means for prohibiting traveling in a circular manner.

With the above configuration, according to the present invention, when the combine reaches the end of the crop during the reaping operation and the movement direction is changed, the culm sensor detects that all the reaped culms pass through the threshing device. can. Furthermore, the culm can only be traveled around after the culm sensor no longer detects the culm due to the travel prohibition means. Therefore, if there is a culm in the threshing device, the threshing device does not travel around and the rotation speed control means does not operate. Therefore, it is possible to perform the threshing operation on all the harvested husks while maintaining the set rotational speed according to the harvesting conditions. This reduces the processing accuracy of the threshing device and prevents an increase in the loss rate. (f) Embodiment FIG. 1 is a schematic diagram of a cross section.

A reaping section 2 is provided at the front of the combine 1. This reaping section 2 moves in the direction of arrow E or F, and moves to a lower reaping position and an upper retracted position. A stock head sensor 1) is provided below the reaping section 2. This stock sensor 1
) detects the presence or absence of crops to be harvested. combine l
A threshing device's threshing chamber 4 is provided in the center of the interior. A plow barrel 5 having a plurality of plow teeth 6 is rotatably provided inside the plow chamber 4. The rotation of the milling barrel 5 separates the husk into grains and culm waste, of which only the grains are harvested into the hopper IO.

A conveyance path 8 is provided from the reaping section 2 to the rear via the threshing device. This conveyance path 8 holds the weighing portion of the cut culm and guides it rearward via the threshing device. A culm sensor 9 is attached to the conveyance path 8 at a position opposite to the terminal end of the plow cylinder 5 . This culm sensor 9 detects whether or not there is a shell culm in the conveyance path 8 . An operating section 3 is formed in the upper front part of the combine 1. This operating section 3 is provided with a shift lever 12. Also, combine 1
The vehicle has a pair of left and right crawlers 7, and is driven by the crawlers 7. During rotation, the rotating roller is stopped. For example, when the combine harvester rotates to the right, the drive of the right crawler is stopped. FIG. 3 is a block diagram of the control section of the combine harvester.

The driving force of the engine 27, which is the power source, is guided from the crankshaft to the gear transmission 28 via the hydraulic transmission 30, and then to the axle 7a.

7b. The operation is transmitted to the engine 27. A shaft portion of an accelerator motor 42 is attached to the accelerator 43, and the accelerator can be moved via the accelerator motor drive section. Further, the crankshaft of the engine 27 is provided with an electromagnetic pink-up 45 to calculate the rotation speed of the engine 27. gear transmission 2
A vehicle speed sensor 26 is provided on the first axis of the vehicle. This vehicle speed sensor 26 is composed of a photo ink club, and a shutter attached to a rotary plate G0 (not shown) connected to the first shaft detects a frequency that blocks the light of the photo ink club and converts it into a vehicle speed signal. do.

The hydraulic transmission 30 includes a variable displacement pump 30a and a low displacement motor 30b. The suction amount, discharge amount, and direction of pressure oil are changed by changing the angle of a variable swash plate 30c provided inside the variable displacement pump 30a.

This change results in a change in the rotation speed and rotation direction at the time of output in the low capacity motor 30b, and the gear transmission 28
transmitted to.

A shift lever 12 provided on the operating section 3 is connected to a rotating plate 12.
It is fixed at a. This rotary plate 12a is the link mechanism 1
2b is connected to the variable swash plate 30c of the variable displacement pump 30a. Further, the shaft portion of a variable speed motor 29 is connected to the rotating shaft of the rotating plate 12a via a friction plate (not shown). The variable speed motor 29 can rotate in both forward and reverse directions, and by changing the direction of current by the variable speed motor drive unit 25, the variable speed motor 29 can be rotated forward or reverse.

The ON signals of the culm sensor 9 and stock sensor 1) are input to the CPU 21 via the I10 interface 22. Further, detection signals from the electromagnetic pickup 45 and the vehicle speed sensor 26 are input. The electromagnetic pickup 45 and the vehicle speed sensor 26 generate l pulses each time the crankshaft and the first shaft rotate once. This number of pulses is counted by a counter not shown. This count value is input to the CPU 21 every minute. A control signal is output from the CPU 21 to the variable speed motor drive unit 25 via the 10 interface 22. In response to this control signal, a drive signal is output from the speed change motor drive section 25 to the speed change motor 29, and the shift lever 12 is operated. Similarly, a control signal is output to the accelerator motor drive unit 41, and in response, a drive signal is output to the accelerator motor 42, and the accelerator 43 is operated. A ROM 23 connected to the CPU 21 stores programs such as circular mowing and direction changing operations. The RAM 24 also stores input and output data such as the current rotational speed of the engine 27 and the distance traveled.

FIG. 1 is a flowchart showing the operation of the travel control mechanism of the combine harvester.

After the main key is turned on, data is entered manually in step nl (hereinafter "step ni" is simply referred to as "ni"). The data input here is the crop variety, the harvesting conditions such as rice moisture, and is input by operating keys provided on the operation section.

Next, when the conditions for automatic control are satisfied in n2, the process proceeds to n4. In n4, set rotation speed R corresponding to the reaping conditions.
is read out from the ROM 23. At n5, the current rotation speed Ra detected by the electromagnetic pickup 45 is read, and at n6, a control signal is output to the accelerator motor drive unit 41 so that the current rotation speed Ra is located at the set rotation speed R.

At n7, it is determined whether the stock price sensor 1) is on. If there is a crop to be harvested in front of the combine l and the plant head sensor 1) is on, the process returns to n5.

Therefore, during the reaping work, operations n5 to n7 are repeated, and the engine 27 maintains the set rotation speed R.

When the stock sensor 1) is turned off at n7, the process proceeds to n8, and measurement of the mileage Lx is started. Next, at n9, the reaping section 2 is raised to the retracted position. At nlo and nil, it is determined whether the culm sensor 9 is turned off and the travel distance Lx is equal to or greater than the preliminary travel distance for the direction change operation. After the combine 1 reaches the end of the crop and there is no more crop to be harvested in front of it, the culm sensor 9 is turned off and the combine harvester continues to travel straight at the set rotation speed R until it exceeds a preset preliminary travel distance.

When the preliminary run is completed at nil, the process proceeds to n12, where a turning action is performed to change the direction of movement of the combine I. At this time, the value of the current rotation speed Ra is read at regular intervals and compared with the previous rotation speed. When the current rotation speed Ra is smaller than the previous rotation speed, the accelerator is operated to increase the engine rotation speed by a predetermined amount. This kind of rotation speed comparison and increase work is currently done at the rotation speed R2O.
This continues until the value exceeds the previous rotational speed value.

Thereby, the load acting on the traveling device can be made to approximately match the rotational speed that produces the maximum output.

Next, at n13, the moving direction changing operations of W3, W4, W5, and W6 shown in FIG. 4 are performed.

When this movement direction changing operation is completed, the process returns to n2 and the reaping operation is performed at the set rotation speed R. In the above, nlO corresponds to the rotation prohibition means of the present invention.As described above, according to this embodiment, after the combine harvester reaches the end of the crop,
The round trip does not start until the culm sensor 9 is turned off.

Therefore, the rotational speed of the engine is changed after the culm is removed from the threshing device. Therefore, the processing accuracy of the threshing device does not deteriorate due to a change in the rotation speed of the threshing barrel.

In addition, in this example, a combine harvester with an automatic direction change function that automatically controls the direction change operation including rounding is explained. Similar effects can be obtained if the combine harvester is equipped with a rotation speed control means that controls the rotation speed to be the output.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operation of the travel control mechanism of a combine harvester according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional side view of a combine in which the travel control mechanism is used, and FIG. 3 is a diagram showing the control section of the combine. The block diagram and FIG. 4 are plan views showing the rotational operation of the combine harvester. 9-culm sensor, 12-shift lever, 127-engine, 43-accelerator.

Claims (1)

[Claims] (1) In the traveling control mechanism of a combine harvester, which has a rotational speed control means that controls the load acting on the traveling device to a rotational speed that produces the maximum output during rounding, the plow barrel is It is provided with a culm sensor that is provided behind a position facing the terminal end and detects the presence or absence of a culm, and a traveling prohibition means that prohibits traveling when the culm sensor detects a culm. A travel control mechanism for a combine harvester.