JPS6337786Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an automatic operation that automatically drives the mechanism that adjusts the handling depth by changing the position to a preset position corresponding to the culm length based on the detection result of the culm length detection mechanism. Regarding a handle depth adjustment device for a combine harvester configured to be switchable between a state and a manually operated state in which the drive is operated to a desired position based on a manual command,
The aim is to reduce the cost of the overall structure without significantly impairing the handling depth adjustment function.

The above-mentioned handling depth adjustment device is capable of automatically adjusting the handling depth to the appropriate depth at all times while saving labor in the automatic operation state, and furthermore, in the manual operation state, it is capable of automatically adjusting the handling depth to the appropriate depth according to various conditions such as the conditions of the target grain culm and the working conditions. This system allows the handling depth to be set and maintained at the desired depth depending on the situation, and is convenient for practical use. Since the operable range was set to be the same, there was a problem that the overall structure became quite expensive.

In other words, the range in which the position of the handling depth adjustment mechanism can be changed is set to a large range that can sufficiently accommodate extremely long culms and extremely short culms that do not often exist in normal fields. Conventionally, the entire position within such a large range was changed accurately even during automatic operation, so the culm length detection mechanism was designed to be large enough to reliably detect changes in culm length over a large range. Therefore, expensive materials were used, and the overall structure tended to be quite expensive.

The present invention has been made with the above-mentioned circumstances in mind, and in a combine harvester handling depth adjustment device having the above-mentioned structure, the handling depth can be adjusted only in a smaller range in the automatic operation state than in the manual operation state. It is characterized in that the adjustment mechanism is configured to be operable to change its position.

In other words, even if the handling depth is not automatically adjusted for extremely long or extremely short culms, which do not often exist in normal fields, it may be possible to manually adjust the handling depth as needed, which poses a particular problem in practical terms. Focusing on the fact that there is no
In the automatic operation state, the handling depth adjustment mechanism can be operated to change the position only within a smaller range than in the manual operation state, so the culm length detection mechanism provided for automatic operation only needs to detect changes in culm length within a small range. Therefore, it is possible to use a small and inexpensive one. Eventually, I solved the problem mentioned above,
A device for adjusting the handling depth of a combine harvester with great practical advantages has been obtained.

Embodiments of the present invention will be described in detail below with reference to illustrative drawings.

Figure 1 shows the front side of the combine, including a crawler traveling device 1, a threshing device 2, and a driver's seat 3.
The front part of this machine is equipped with a device 4 for pulling up multiple rows of grain culms planted in the field, a reaping device 5 for cutting the base of the raised grain culms, and a conveying device 6 for merging the harvested grain culms. A reaping processing section is connected and equipped, which includes a rear conveyance device 8, etc., which conveys the merged grain culms to the rear, and delivers them to the threshing feed chain 7 in a sideways position at the end of the conveyance. Reference numeral 9 in the figure is a traveling speed change lever, and as shown in FIGS. 5 and 6, it is configured to swing back and forth and left and right to change the traveling speed in six steps. In addition, in Figure 5
The positions indicated by V ₁ , V ₂ , V ₃ , V ₄ , V ₅ , and V ₆ are operating positions that provide 1st to 6th gears in this order.

As the process progresses, the grain culms planted in the field are raised and harvested, and the harvested grain culms are sequentially handled and threshed automatically and continuously.

Next, the handling depth adjusting device will be explained based on FIGS. 1 to 4.

The feed chain 7 at the conveyance end is changed by vertically changing the position of the starting end of the rear conveyance device 8 around the fulcrum P at the end, and changing the grain culm support position at the start end in the culm length direction. The electric motor 10 is configured as a handling depth adjustment mechanism that changes the grain culm delivery position to the grain culm and, as a result, changes the insertion amount of the grain culm tip into the threshing device 2, and is capable of forward and reverse rotation.
An output shaft 11 is interlocked and connected via a worm deceleration mechanism 12 and a chain 13 to a link mechanism 14 for changing the position of the rear conveyance device 8.

A culm length detection mechanism 15 is attached to the pulling device 4. This detection mechanism 15 consists of three culm presence/absence detection sensors 15a, 15b, 1 that are pressed and swung by the grain culm at appropriate intervals in the culm length direction of the raised grain culm.
5c are arranged in parallel, and each sensor 15a, 15b, 15
The culm length is detected in four stages by electrically detecting the oscillating displacement of c using sensor switches Sa, Sb, and Sc. That is, a first grain culm shorter than the lower sensor 15c, a second grain culm between the lower sensor 15c and the intermediate sensor 15b,
The third grain culm is between the middle sensor 15b and the upper sensor 15a, and the fourth grain culm is longer than the upper sensor 15a.
It is configured to determine the culm length of the grain culm.

The worm deceleration mechanism 12 has a function to detect the swinging position of the rear conveyance device 8 at the attachment part thereof, and a mechanism for adjusting the conveyance device 8 in advance according to the culm length based on the four-step detection results of the culm length detection mechanism 15. A rotary sliding contact type switch mechanism ₁₆ is provided, which has the function of operating the motor 10 to change the position by operating the motor 10 to four set positions, and the function of operating the motor 10 in forward and reverse directions based on a command from the manually operated switch SW1. ing. This sliding type switch mechanism 16 is connected to each of the sensor switches Sa, Sb, and Sc of the culm length detection mechanism 15, and has a partially arc-shaped fixed contact a connected to the manually operated switch _SW1 . ，
b, c, a', b', c' partial arc-shaped fixed contacts d, d' connected only to the manually operated switch SW ₁ ; a pair of forward/reverse operation control relays 1 for the electric motor 10;
7 and 18, and a pair of movable contacts f, f' which are integrally rotatable and have three divided contact parts connected to each other. The movable contacts f,
The support member 19 of f' is connected to the worm deceleration mechanism 12.
The output shaft 20 is fixed to and rotated.

Also, in the electrical circuit diagram shown in Figure 4, SW ₂
The rear conveyance device 8 is set in advance according to the culm length based on the detection result of the culm length detection mechanism 15.
An automatic operation state in which the motor 10 is used to automatically drive the rear transport device 8 to a desired position based on a command from the manual operation switch SW ₁ . This is a switch that can be switched between the automatic operation contact A and the manual operation contact M. SW ₃ is a main switch, and Sd is a sensor switch that switches between automatic operation and non-operation in the automatic operation state. It is configured to be operated by the culm presence/absence detection sensor 15b that is pressed against the culm.
Further, L is a lamp indicating that the operation is being performed in the automatic operation state.

The operation of the handling depth adjusting device having the above configuration will be explained separately in an automatic operation state and a manual operation state.

Automatic operation state As the grain culm becomes shorter, in order to move the rear conveyance device 8 downward and operate it for deeper handling, the fixed contact e', the movable contact f', and the fixed contacts a', b', and c are pressed. ' Using the contact circuit, energize the deep handling side relay 17,
The motor 10 is driven in normal rotation toward the deep handling side. When the support member 19 is rotated clockwise by the drive of the motor 10 and the movable contact f' is disengaged from the lowest one of the sensor switches Sa detecting the absence of a culm, at this point The relay 17 is de-energized and the motor 10 is stopped. Therefore, during deep handling operation, the stationary contacts a', b', c' have stop positions F ₃ , F ₂ , F ₁ near the clockwise ends, and these positions F ₃ , Each of F ₂ and F ₁ is set to correspond to each of the third, second, and first grain culms.

Conversely, as the grain culm becomes longer, the rear conveyance device 8
To change the position of
Using the contact circuit according to c, the shallow handling side relay 18
When energization is applied and the support member 19 is rotated counterclockwise by the drive of the motor 10, the movable contact f is removed from the uppermost one of the sensor switches Sa detecting the presence of a culm. At this point, the relay 18 is de-energized and the motor 10 is stopped. Therefore, during shallow handling operations, near the counterclockwise ends of each fixed contact a, b, c,
It has stop positions F ₄ , F ₃ , and F ₂ , and these positions F ₄ , F ₃ , and F ₂ are set to correspond to the fourth, third, and second grain culms.

Manual operation state By switching the manual operation switch SW ₁ to the shallow contact U or the deep contact D, fixed contacts d and d' are added to the contact group used in the automatic operation state. Using the contact circuit, in a state where the position change operation is possible in a range closer to the long culm than the adjustment range in the automatic operation state, by returning the switch SW ₁ to the neutral position, the rear conveyance device 8 is operated at that position. It is possible to change the position steplessly while stopping. Therefore, during this manual operation, the position can be changed steplessly between the _F1 position and the stop position _F5 near the counterclockwise end of the contact point d.

In addition, as shown in the electrical circuit diagram of Fig. 4, capacitors C ₁ , C ₂ and C ₁ ′, C ₂ ′, and transistors
In a switch circuit configured using T ₁ , T ₂ and T ₁ ′, T ₂ ′, both relays 17 and 18 transmit signals from the sliding contact type switch mechanism 16 in the automatic operation state. Even if a change in culm length is suddenly detected, the processing depth is not adjusted immediately, but after an appropriate delay. There is. Then, one of the capacitors C ₁ , C ₂ or C ₁ ′, C ₂ ′ is switched between an unused state and a used state by opening and closing the switch SW ₄ , and the delay time is divided into two stages. The switch SW ₄ is a switch operating piece 21 that is pressed and swung by the front speed change lever 9.
, it is automatically closed when the traveling speed is operated to the low speed range V ₁ , V ₂ , and the high speed range V ₃ , V ₄ , V ₅ ,
It is automatically activated when V ₆ is operated. (See FIGS. 5 and 6) When implementing the present invention using the slide contact switch mechanism 16 of the embodiment, as shown by the imaginary line Q in FIG.
When the fixed contact d' and the fixed contact C are connected and the changeover switch SW ₂ is switched from the manual operation contact M to the automatic operation contact A, even if the rear transport device 8 is out of the adjustment range in the automatic operation state, It may be configured so that the adjustment range in the automatic operation state can be automatically returned even if the position is in the manual operation state. It may be configured such that the rear conveyance device 8 that has been operated to a disengaged position is maintained at that position regardless of the switching to the automatic operating state.

FIG. 7 shows a circuit diagram when the present invention is applied when the rear conveyance device 8 is driven and operated using a hydraulic cylinder 26 instead of the electric motor 10, and the rear conveyance device 8 is operated using a changeover switch _SW2 . When the automatic operation state is established, the culm length detection mechanism 15 is operated in conjunction with a signal from the voltage generation circuit 27 which extracts the detection result as a predetermined plurality of voltage values, and with the up and down movement of the rear conveyance device 8. The signal from the variable resistor 28 is calculated in an adder/subtractor circuit 29, and this calculated value is compared and determined in a shallow handling side comparison circuit 30a or a deep handling side comparison circuit 30b to perform handling depth adjustment. When it is determined that it is necessary, the shallow-handling transistor 31a or the deep-handling transistor 31b is made conductive, and the shallow-handling solenoid 32a, 32b of the hydraulic control valve 32 is energized. The device 8 is automatically operated to a preset position corresponding to the culm length.

Furthermore, in the manual operation state using the changeover switch _SW2 , the rear conveyance device ₈ can be operated to any position by directly energizing the solenoid 32a or 32b using the manual operation switch SW1.
In addition, this operable range is configured to be a range that can be adjusted in the range along the long culm as well as the range along the short culm compared to the adjustment range in the automatic operation state. When the long culm and short culm ends of the operable range are reached, the limit switches 33a and 33b operated by the hydraulic cylinder 26 automatically stop energizing the solenoid 32a or 32b. ing.

In addition, in the automatic operation state, the oscillation circuit 34 and
The position of the rear transport device 8 is intermittently changed while the solenoids 32a and 32b are intermittently energized using a circuit including the AND circuits 35a and 35b. Furthermore, the oscillation circuit 3 is activated based on the signal from the sensor switch Sd described in the above embodiment.
4 between the operable state and the inoperable state, the automatic operation state can be switched between a state in which the automatic operation is performed and a state in which the automatic operation is not performed. In addition, 36 in the figure is a sensor switch Sd.
37 is a delay circuit for adjusting the handling depth only when the culm length fluctuation has changed continuously for a set time; 38 is a delay circuit for inverting the signal of the rear conveyance device 8 set corresponding to the culm length; This is a manually operated variable resistor for finely adjusting the operating position.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the handling depth adjustment device for a combine harvester according to the present invention, and FIG. 1 is a schematic side view of the front part of the combine, and FIG. 2 is a schematic side view showing the position change operation structure of the rear conveyance device. , Fig. 3 is a longitudinal sectional front view of the same structure, Fig. 4 is an electric circuit diagram, Fig. 5 is a plan view of the gear shift lever mounting part, Fig. 6 is a side view of the same part,
FIG. 7 is a circuit diagram of another embodiment. 8... Rear conveyance device, 15... Culm length detection mechanism.

Claims (1)

[Claims for Utility Model Registration] The mechanism 8 that adjusts the handling depth by changing the position,
Switching operation between an automatic operation state in which the drive is automatically operated to a preset position corresponding to the culm length based on the detection result of the culm length detection mechanism 15, and a manual operation state in which the drive is operated to a desired position based on a manual command. The handling depth adjustment device for a combine harvester is configured such that in the automatic operation state, the handling depth adjustment mechanism 8 can be operated to change the position only within a smaller range than in the manual operation state. Combine harvester handling depth adjustment device. The combine harvester according to claim 1, which is configured to allow a position change operation in the range of the long culm in the manual operation state than the adjustment range in the automatic operation state. Adjustment device. The combine harvester according to claim 1, which is configured to allow a position change operation in a shorter culm length range in the manual operation state than in the automatic operation state. Adjustment device. The utility model is configured such that, in the manual operation state, the handling depth adjustment mechanism 8, which has been operated to a position outside the adjustment range in the automatic operation state, is maintained at that position regardless of switching to the automatic operation state. A handling depth adjustment device for a combine harvester according to any one of claims 1 to 3.