JPS5840826Y2 - agricultural combine harvester - Google Patents

Description

[Detailed description of the invention] The present invention is configured to thresh the husks harvested as the machine moves through a threshing section, and also has a mechanism for detecting the load on 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.

In devices that detect threshing load fluctuations and feed back this detection result to the operation tool of the machine's travel transmission mechanism to automatically control the travel speed during threshing, the machine is at its best when the threshing load is small and the machine's travel control is at its best. In the case of a threshing situation where there is still surplus driving force even when the speed has been reached, a travel control command exceeding the travel speed control range is input to the operation tool of the transmission mechanism, that is, the operation tool is Even when the mechanical operating limit is reached, the control force for speed increase continues to be applied to the operating tool, putting strain on the operating system of the transmission mechanism and the control system of the control mechanism, and sometimes even causing damage. .

The present invention was developed in view of the above-mentioned circumstances, and is an agricultural combine harvester configured to automatically control the traveling speed of the machine by detecting the threshing load. In addition to providing an operating tool position detection mechanism that detects when the operating tool approaches the mechanical operation limit on the speed increasing side,
A mechanism is provided in conjunction with the operating tool position detection mechanism to intermittent only the speed increase control of the load detection mechanism and the speed change mechanism, so that the operating tool can be operated before the operating tool reaches its mechanical operating limit. The structure is such that the drive to the speed-increasing side for the tool is automatically cut off, and this structure provides the following effects.

That is, before the operating tool reaches its mechanical operating limit, the automatic control of the aircraft traveling in the direction of its operating limit is canceled, thereby solving the problem caused by continuous application of control driving force to the operating tool.

In particular, the present invention cuts off the control drive force for the operating tool by cutting off only the speed increasing control section in the automatic control, while keeping the control section on the deceleration side as operable as before. Therefore, the automatic control of the traveling speed based on the threshing load works effectively, and complete automation with a deterrent ability regarding its own operating limits can be achieved, making it extremely convenient in actual use.

Next, embodiments of the present invention will be described in detail based on the drawings.

A threshing section 2 is mounted on a machine base equipped with a crawler traveling device 1, and in front of the threshing section 2, a planted husk is pulled up and harvested, and the cut husk culm is supplied to the threshing section 2. An agricultural combine harvester is constructed by providing a pre-processing device 3 and also appropriately providing a waste straw processing device 4 such as a cutter or a tying machine in the waste straw of the threshing section.

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

The operating tool 5 includes a shaft 1 having an operating lever 9 of a transmission mechanism 6.
0, and a servo motor 12 is connected to its shaft 10 via a clutch 11.

This servo motor 12 is controlled to rotate in forward and reverse directions by a mechanism 13 that detects the threshing load in the threshing section 2. According to fluctuations in the threshing load, when the load is low, the machine speed is reduced, When the load is small, the operation driving force for the transmission mechanism 6 is applied to the operating tool 5 in order to increase the speed.
In other words, the transmission mechanism 6 and the threshing load detection mechanism 13 are linked to automatically control the machine running speed so that the threshing load is maintained within a set range.

The threshing load detection mechanism 13 includes a mechanism 15 that extracts the threshing load in the threshing section 2 as a load variation of the rotational torque of the handling cylinder 14, and a mechanism 15 that extracts the threshing load in the threshing section 2 as a load variation of the rotational torque of the handling cylinder 14, and detects the detection result of this load variation from the reference value based on the load range. The servo motor 12 also includes a mechanism 16 that determines whether the load is a dog or a small load, and control circuits H and L that input speed increase control input or deceleration control input to the servo motor 12 based on the result of the determination. has been done.

The operating tool 5 consists of an outer cylinder 17 that is integrally connected to a shaft 10, 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 of the operating tool 5 in relation to the shaft 10 by a cam 19 having a shape to be described later is attached to the outer cylinder 1.
It is provided to penetrate through 7.

The cam 19 has a cam surface that restricts the swinging of the pin body 20 in the first position near the shaft 10 about the shaft 101 to a range A, and a cam surface that restricts the swing of the pin body 20 in the second position. It has a cam surface that restricts the swinging of the pin body 20 in the third position to a range of C, and a cam surface that restricts the swing of the pin body 20 in the third position to a range of C. In range B, the operating tool 5 can be operated in the range of maximum forward speed position 1, and in range C, it is possible to operate the operating tool 5 in the range from the maximum forward speed position, including stopping the aircraft, to the maximum reverse speed position 1. ing.

A limit switch LS is switched to the energized state when the pin body 20 is in the second or third position.
I is interposed in the input circuit of the servo motor 12, and when the pin body 20 is in the first position, the automatic control circuit for aircraft travel is cut off, and the configuration is such that manual operation can be performed within the range of A. ing.

That is, as a mechanism for switching the operating tool 5 to a state in which only manual operation is possible, and in conjunction with switching to a state in which only manual operation is possible, the linkage between the load detection mechanism 13 and the transmission mechanism 6 is automatically controlled. The limit switch LSI is provided as a mechanism for reversibly cutting off the power.

Further, a limit switch LS2 is interposed in the high-speed control circuit H, which is switched to a cutoff state when the operating tool 5 is in an automatic operating state and its operating position approaches a high-speed operating limit, and the limit switch LS2 is installed in the high-speed control circuit H. The configuration is such that before the operating tool 5 reaches its mechanical operating limit in a state where the speed is automatically controlled, the manual speed increase control by the load detection mechanism 13, that is, the drive to the operating tool 5 in the direction of its operating limit is cut off. has been done.

In other words, as an operating tool position detection mechanism that detects that the operating tool 5 of the transmission mechanism 21 approaches its mechanical operation limit,
The limit switch LS2 is provided as a mechanism for connecting and disconnecting the load detection mechanism 13 and the transmission mechanism 6 in conjunction with the operating tool position detection mechanism.

The mechanism for changing the position of the center shaft 18 with respect to the outer cylinder 17 of the operating tool 5 includes a spring 22 that biases the pin body 20 toward the shaft 10.
At the same time, the shaft 10 is attached to the handle 23 connected to the outer cylinder 17.
A grip portion 24 is provided which can freely swing around an axis perpendicular to the center shaft 18 , and the grip portion 24 and the center shaft 18 are connected to each other.
is configured to be slidable in the axial direction, and the pin body 20
A spring return type locking device 21 is provided on the handle 23 for fixing the posture when the pin body 20 is in the second position, thereby determining the switching posture of the pin body 20 between the first and second positions. , the pin body 2 is held in the grip state by the grip part 224.
0, and the grip part 2
In order to be able to stably maintain the grip release state of 4, a cam portion 19a for fitting the pin body is formed on the cam surface portion of the cam 19 in the range C.

Note that when the pin body 20 is switched to the third position, the traveling speed of the aircraft is automatically controlled, but due to the presence of the clutch 11 interposed in the automatic travel control system, the automatic control state is not maintained. It is configured so that it can be operated by humans.

[Brief explanation of drawings]

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, 5... Operation tool, 6...
...Transmission mechanism, 13...Load detection mechanism.

Claims (1)

[Scope of utility model registration request] The structure is configured so that the shell culms harvested as the machine moves are threshed in the threshing section 2, and a mechanism 13 for detecting the load on the threshing section 2 is linked with a transmission mechanism 6 for the machine's running. The agricultural combine is configured to automatically control the traveling speed of the machine in order to maintain the load within a set range, and detects that the operating tool 5 of the speed change mechanism 6 approaches the mechanical operating limit 1c on the speed increasing side. An operating tool position detection mechanism is provided, and in conjunction with the operating tool position detection mechanism,
A mechanism is provided that does not disconnect only the speed increase control between the load detection mechanism and the speed change mechanism, thereby driving the operating tool 5 to the speed increasing side before the operating tool 5 reaches its mechanical operation limit. An agricultural combine harvester characterized in that the agricultural combine harvester is configured to be automatically cut off.