JPS6015284B2 - agricultural combine harvester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a structure in which grains harvested as the machine moves are threshed in a threshing section, and also includes a mechanism for detecting the load in the threshing section and a transmission mechanism for the machine's running. The present invention relates to an agricultural combine harvester configured to automatically control the traveling speed of the machine in order to maintain the threshing load within a set range.

The threshing load fluctuates as the grain crop and drying conditions change, and if left unchecked, the threshing efficiency will drop significantly, but as mentioned above, the machine running speed should be controlled according to the threshing load fluctuations. Therefore, the threshing load can be maintained within the set range and the traveling speed can be increased as much as possible, making it possible to perform efficient threshing processing. However, in the conventional control system, when increasing the traveling speed, the response delay in the control system causes the highest possible speed to be reached by operating the transmission mechanism, regardless of the average traveling speed determined by the threshing conditions. As a result, the input signal level in the control system becomes too high, and the threshing load exceeds the set range as the machine speed increases, making it impossible to maintain the most efficient threshing state, which is the most important point in the above control. , Also, due to the increase in such excessive error,
The aircraft's speed was increased frequently, causing a so-called chattering problem.

The present invention has been made in view of the above-mentioned circumstances, and the technical measures taken to solve the problem are based on the detection results of the load detection mechanism in the agricultural combine mentioned at the beginning of the detailed description. A drive device is provided to automatically control the speed of the aircraft by operating a speed change operation tool for the aircraft, and the drive device and the speed change operation are linked together via a friction transmission mechanism so that manual operation can be prioritized. At the same time, a switch is inserted in the transmission system of the speed increase signal in the automatic running speed control system of the load detection mechanism, and this switch is connected to the travel path of the shift operation odor and the shift operation tool corresponding to the furthest distance of the aircraft. The switch is attached to a moving position, and the transmission circuit of the amplification signal is cut off by abutment between the speed change operating tool and the switch.

By taking the above measures, in the present invention, when the traveling speed of the aircraft reaches the set maximum speed in the automatic control state, the transmission circuit of the speed increase signal is cut off, thereby adjusting the input signal level in the control system to an appropriate level. This makes it possible to respond to changes in the threshing load caused by changes in the running speed with good responsiveness, less overshooting errors due to control inertia, and a shorter stabilization time. It has now become possible to always perform good automatic control that suppresses the appearance of defects. Moreover, even during automatic control, the friction transmission mechanism gives priority to manual operation, so it is possible to quickly respond to unexpected situations with manual operation. Since only the signal transmission circuit is cut off, if the threshing load increases thereafter, a deceleration operation is executed and normal automatic control is restored, and the maximum distance state continues regardless of the increase in the threshing load, which is an inconvenience. Nor. Next, embodiments of the present invention will be described in detail based on the drawings.

A threshing section 2 is mounted on a joint equipped with a crawler traveling device 1, and a shield standing thresher is raised in front of the threshing section 2 to reap the grain, and this reaped grain is supplied to the threshing section 2 for pre-treatment. Device 3
In addition, an agricultural combine harvester is constructed by providing a 9E straw processing device 4 such as a cutter and a tying machine as appropriate at the straw mouth of the threshing section 9E.

The traveling device 1 is driven via a variable discharge capacity pump 6 whose pressurized oil supply amount is controlled by an operating tool 5, a motor 7 driven by this pump 6, and a transmission 8. The pump, whose direction can be changed, serves as an aircraft traveling speed changing mechanism 6.

The operation tool 5 is located next to the control lever 9 of the transmission mechanism 6.
0, and a servo motor (drive device) 12 is disposed on its shaft 10 via a clutch (friction transmission mechanism) 11.

This servo motor 12 is controlled in forward and reverse rotation by a mechanism 13 that detects the threshing load in the threshing section 2. According to fluctuations in the threshing load, when the load becomes large, the machine speed is reduced, In order to increase the speed when the load is small, the operation driving force for the transmission mechanism 6 is applied to the operation smell 5. In other words, the transmission mechanism 6 and the threshing load detection mechanism 13 are linked to reduce the threshing load. This automatically controls the aircraft's traveling speed to maintain it within a set range.

The threshing load detection mechanism 13 includes a mechanism 15 that handles the threshing load in the threshing section 2 and extracts it as a load fluctuation of the rotational torque of 8 and 14, and a mechanism 15 that extracts the threshing load in the threshing section 2 as a load fluctuation of the rotational torque, and the detection result of this load fluctuation is set to a reference value based on a certain load range. A mechanism 16 for determining whether the load is larger or smaller than the servo motor 12; has been done.

The operating tool 5 consists of an outer cylinder 17 that is integrally installed with the shaft 1, and a center shaft 18 that can be moved to three positions in the axial direction with respect to the outer cylinder 17. A pin body 20 for regulating the operating range around the shaft 10 of the operating tool 5 is attached to the outer cylinder 1 by a cam 19 having a shape to be described later.
7.

Moreover, the operating section 5 further operates the center shaft 18 to release the pin body 2.
It has a structure that changes the vertical position of 0 in three stages. This configuration includes a spring 22 that urges the pin body 20 toward the shaft 10, a handle 23 that is swingably attached to the outer cylinder 17, and a handle 23 that is connected to the center shaft 18 at its free end. , a handle portion 24 for vertically moving the center shaft 18 against the spring 22, and a spring return type locking device 21 for fixing the grip portion 24 in a position in which the center shaft 18 is slightly pulled up.
It consists of Therefore, with this configuration, the pin body 20 has a first position at the lowest end, a second intermediate position held by the locking odor 21, and an uppermost position obtained by gripping the grip part 24 by the operator. It can be adjusted to 3 positions. The cam 19 has a first cam near the shaft 101.
A cam surface that restricts the swinging of the pin body 20 around the axis 10 in the second position to a range of A, a cam surface that restricts the swing of the pin body 20 in the second position to a range of B, and a third position. It has a cam surface that regulates the swing of the pin body 20 in the range C, and in range A, from the aircraft stop to a certain high speed position of forward movement, and in range B, further up to the highest high speed position of forward movement. In the range C, the operating tool 5 can be operated in the range from the highest forward speed position to the highest reverse speed position, including when the aircraft is stopped.

In addition, 19a in the figure is a cam part that can be inserted only when the pin body 20 is operated to the third position.
Corresponds to the reverse high-speed driving operation position. Also, the second part of the drawing
As shown in the figure, the input circuit of the servo motor 12 includes a third limit switch that is switched to the energized state when the pin body 20 is in the second or third position.
The mitt switch shown in the figure is interposed. The vehicle speed control state will be described based on the above explanation.

First, when the pin body 20 is in the first position, the automatic control circuit is cut off by the limit switch LS, so the servo motor 12 does not tumble, and the speed can be changed only by manual operation within the range A. Next, when the pin body 20 is held in the second position by the locking tool 21, the limit switch LS is switched to the energized state, the automatic control circuit is activated, and the automatic control of the traveling speed based on the threshing load is performed within the range. This is done in B. Furthermore, since the servo motor 12 and the ratchet 10 of the operating tool 5 are connected via the clutch 11 as a friction transmission mechanism, the operating force of the servo motor 12 cannot be resisted even in the automatic control state within the range B. to give priority to manual operations. Finally, when the pin body 20 is operated to the third position by the operator grasping the grip part 24 provided on the handle 23, the automatic control circuit is activated because the limit switch LS is energized. Although it is working, since the handle 23 is held by the operator, automatic control is not executed due to the action of the clutch 11, and manual operation within range C is possible, and the pin body 20 is inserted into the cam portion 19a with iron. Accordingly, even if the grip portion 24 is released, the high-speed backward traveling state can be maintained against the operating force of the servo motor 12. In this embodiment of the present invention, in addition to the above configuration, when the pin body 20 of the operating tool 5 is in the automatic control state in the second position and the operating position approaches the high-speed operating limit, the cutoff state is established. The limit switch 2, which is switched to the high-speed control circuit, is connected to the high-speed control circuit, and when the operating speed 5 reaches the mechanical operating limit while the aircraft traveling speed is being automatically controlled, the load detection mechanism 13 The configuration is such that the speed increase control input, that is, the drive to the operating tool 5 in the direction of its operation limit is cut off.

In other words, the load detection mechanism 13 and the transmission mechanism 6 function as an operation tool position detection mechanism for detecting that the operation tool 5 of the transmission mechanism 6 approaches its mechanical operation limit, and in conjunction with the operation odor position detection mechanism. The limit switch LS2 is provided as a mechanism for disconnecting and disconnecting the link. This limit switch 2 is configured such that its mechanical operation limit position can be changed in the circumferential direction around the shaft 10. In other words, in the automatic traveling speed control system by the transmission mechanism 6, the limit switch 2 The maximum speed setting value is configured to be changeable.

．．

[Brief explanation of the drawing]

The drawings show an embodiment of the agricultural combine harvester according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a block diagram of the automatic control system,
FIG. 3 is a side view of the operating tool, and FIG. 4 is a sectional view of the operating tool. 2... Threshing section, 6... Speed change mechanism, 13
...Load detection mechanism. Figure 1 Figure 2 Figure 3 Figure 3

Claims (1)

[Claims] 1 A mechanism 13 for detecting the load on the threshing section 2 and a transmission mechanism 6 for the traveling of the machine, which is configured to thresh the grain culms harvested as the machine travels in the threshing section 2.
In an agricultural combine configured to automatically control the machine running speed in order to maintain the threshing load within a set range by linking the A drive device 12 is provided to automatically control the traveling speed of the aircraft by operating the drive device 1.
2 and the speed change operating tool 5 are interlocked and connected via a friction transmission mechanism 11 to enable manual operation with priority, and a switch is provided to the transmission system of the speed increase signal in the automatic running speed control system of the load detection mechanism 13. LS_2 is installed, and the switch LS_2 is installed in the movement path of the speed change operation tool 5 and at a movement position of the speed change operation tool 5 corresponding to the maximum speed of the aircraft,
An agricultural combine harvester configured to cut off the transmission circuit of the speed increase signal by bringing the speed change operating tool 5 into contact with the switch LS_2.