JPH0130989Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is equipped with an electric cutting height control mechanism that automatically operates an electromagnetically operated control valve for raising and lowering the reaping part based on information from a cutting height detection sensor. A reaping harvest with a cutting height control mechanism, wherein a mechanical linkage mechanism that interlocks and connects an operating tool to the control valve is provided with a flexible part for maintaining the operating tool at a lifting stop position regardless of valve operation by the control mechanism. Regarding machines.

In such a reaping/harvesting machine, the fact that the control valve, which is electromagnetically operated by the control mechanism, can be operated against the electromagnetic operating force is effectively used to operate the control mechanism between an operating state and a non-operating state. So, conventionally,
As shown in FIG. 3, a lever 8 serving as a lifting/lowering operating tool moves the first electric switch S ₁ for switching the control mechanism into the operating state and the second electric switch S ₂ for switching the control mechanism into the non-operating state when the lever 8 as a lifting/lowering operating tool The boss portion of the lift operation _{lever 8} and It is provided to be operated by a cam body T that rotates integrally, and is configured so that only one lifting operation lever 8 is used to perform manual lifting and lowering and to switch the control mechanism between an operating state and a non-operating state. .

However, with this configuration, when switching the control mechanism to the operating state, the reaping section unnecessarily descends,
In addition, there is a problem in that the reaping section rises unnecessarily when the control mechanism is switched to a non-operating state, and for this reason, for example, when starting the reaping operation, it is necessary to manually set the reaping height and perform the reaping operation. Later, when the control mechanism is switched to the operating state, the cutting height may deviate from the desired height as the cutting section lowers unnecessarily, and there is a risk that the cutting section may come into contact with the ground. In addition, when switching the control mechanism to a non-operating state, when the ground is so uneven that it is difficult to detect the cutting height properly during the cutting process, the cutting unit may be unnecessarily removed. As the height increases, there is a risk of various problems such as the cutting height deviating from the desired height, and there is room for improvement.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to take advantage of the advantage of switching the control mechanism between an operating state and a non-operating state with the lifting/lowering operation tool, while at the same time The purpose is to prevent unnecessary lifting and lowering.

A feature of the reaping harvester with a cutting height control mechanism according to the present invention is that an electric switch for switching the control mechanism between an operating state and a non-operating state is turned on and off by operating the flexible part of the operating tool within the flexible range. The point is that it was set up so that it would be done.

Next, the effects of the feature configuration of the present invention will be described.

That is, the control mechanism can be switched between an operating state and a non-operating state as the lifting/lowering operating tool is operated within the range of flexibility provided by the flexible section,
When switching the control mechanism between an activated state and a non-actuated state, the control valve is not operated for this purpose.

therefore switching the control mechanism into operation;
In addition, the control mechanism can be switched to the operating state while maintaining the manually set cutting height, and the control mechanism can be switched to the operating state while maintaining the manually set cutting height. The operation of the control mechanism can be stopped while maintaining the mowing height operated by the mechanism, and this has the advantage of using the lifting/lowering operating tool as an operating tool for switching the control mechanism between the operating state and the non-operating state. A reaping/harvesting machine with a cutting height control mechanism, which can be used more effectively and efficiently, eliminates the disadvantages of the conventional structure described above and can be used more favorably.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in Fig. 1, the front part of the vehicle body is equipped with a crawler traveling device 1, a threshing device 2, a driver's seat 3, etc., and a device 4 for pulling up stems planted in the field is located at the front of the lower end of the device 4. A single-acting fluid pressure cylinder 7 horizontally moves the reaping section A, which is equipped with a weeding tool 4A, a cutting blade 5 for cutting the base of the raised stem culm, and a device 6 for conveying the cut stem culm backwards. Provided to be operable to move up and down around the axis X, and further provided with an operating lever 8 for operating the fluid pressure cylinder 7 to operate the reaping part A up and down,
As a result, a combine harvester is constructed in which the height of the reaping section A above the ground, that is, the cutting height can be freely changed.

As shown in FIG. 2, a swinging arm 10 that locks the neutral return biasing control valve 9 with respect to the fluid pressure cylinder 7 is attached to a support shaft 11 that rotates integrally with the operating lever 8, so that it can rotate freely relative to the swing arm 10. A locking pin 13 is fitted onto the support shaft 11, and is inserted into the linkage flexibility notch 12 formed in the boss portion of the swing arm 10 to lock and swing the swing arm 9. Rotatably installed and operated lever 8
The reaping section A is configured so that it can be manually raised and lowered by switching it to the raising/lowering stop position N, the lowering operation position D, and the raising operation position U, and the notch 12 is flexible. While maintaining the elevation control lever 8 at the elevation stop position N, the mowing section A can be automatically elevated and lowered to maintain a set height using a cutting height control mechanism, which will be described later.

However, the reference numeral 14 in the figure is a ball that engages with the boss portion of the operating lever 8 to hold the operating lever 8 at the lifting/lowering stop position N, and is biased toward the engagement side by a spring 15. be.

To explain the cutting height control mechanism, as shown in FIG. 1 and FIG. Receiver 18b to receive
are provided at the back of the weeding tool 4A, and lowering and raising electromagnetic solenoids 19A and 19B for operating the control valve are also provided. The transmitter 18a is operated intermittently by a timing signal from a control arithmetic unit 20 consisting of a microcomputer, and the reaping section A calculates the time required for the projected ultrasonic waves to reach the receiver 18b.
The height above the ground (cutting height) is determined by the control calculation device 20. Subsequently, the control arithmetic unit 20 compares the height above the ground discrimination result with the signal set in the height above the ground setting device 21, and determines whether lifting is not necessary, rising is necessary, or descending is necessary, and the judgment result is Based on this, the drive circuit 22 of both the electromagnetic solenoids 19A and 19B is actuated.
The height above the ground is automatically raised and lowered to maintain the height within a set height range.

A first start switch 23A for switching the control mechanism into an operating state, and a second stop switch 23B for switching the control mechanism into a non-operation state.
When each of the operating levers 8 is turned to the lower position ON within the flexible range of the notch 12, the first electric switch 23A is switched to the upper position.
A cam body 2 is formed on the lever boss so that when turned OFF, the second electric switch 23B is operated.
4, so that the operating lever 8 can also be used as an operating tool for starting and stopping the control mechanism. It is designed so that it can be carried out without unnecessary lifting and lowering.

However, numeral 25 in the figure is a lamp for displaying the automatic control state, which is lit only when the main switch M is on and the control mechanism is in operation.

In the embodiment described above, the elevation control device is constructed by calculating the average values of the heights above the ground detected at appropriate set time intervals, and performing the elevation control while comparing the calculation results with the set height above the ground. If this is done, it may be possible to eliminate unnecessary lifting and lowering controls for convex portions and concave portions that suddenly appear in the field.

To carry out the invention, a pair of electric switches 23
A, 23B, instead of providing a control mechanism such as providing one electric switch that repeatedly issues a start signal and a stop signal each time it is pressed so as to be pressed by the cam body 24. The specific structure of the electric switch for switching between the operating state and the non-operating state and the operating structure thereof can be modified in various ways.

Further, the present invention can be applied to various types of reaping and harvesting machines in addition to combine harvesters.

In addition to the ultrasonic sensors 18a and 18b described in the embodiment, the mowing height detection sensor may include a combination of a vertically swinging grounding body and a potentiometer that detects its swinging angle. Various configurations are available.

Further, in the embodiment, a link-type mechanical interlocking mechanism using the swing arm 10 and the locking pin 23 is illustrated, but it can be replaced with various configurations such as one using wire, and, In addition to configuring the flexible part with the notch 12, the configuration of the flexible part can be changed in various ways depending on the configuration of the linkage mechanism, such as by using a long hole.

[Brief explanation of drawings]

The drawings show an embodiment of the reaping/harvesting machine with a cutting height control mechanism according to the present invention. Fig. 1 is a side view of the front part of the combine, Fig. 2 is a schematic diagram of the cutting height control mechanism, and Fig. 3 is a conventional example. FIG. 8... Lifting operation tool, 9... Control valve, 12... Flexible part, 18a, 18b... Cutting height detection sensor,
23A, 23B... Electric switch, N... Lifting stop position.

Claims (1)

[Scope of utility model registration request] An electric cutting height control mechanism is provided that automatically operates the electromagnetically operated control valve 9 for raising and lowering the reaping part based on information from the cutting height detection sensors 18A and 18B, and the operating tool 8 for raising and lowering the reaping part is operated by the control valve 9. A reaping/harvesting machine with a cutting height control mechanism, in which a mechanical linkage mechanism interlockingly connected to a cutting height control mechanism is provided with a flexible part 12 for maintaining the operation tool 8 at a lifting stop position N regardless of valve operation by the control mechanism. an electric switch 2 for switching the control mechanism between an active state and a non-active state;
3A, 23B are connected to the flexible portion 12 of the operating tool 8.
A reaping harvester with a cutting height control mechanism that is configured to be turned on and off by operating within a flexible range.