JP3240321B2 - Combine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine having a grain discharging auger for discharging grains packed in a grain tank to the outside.

[0002]

2. Description of the Related Art Conventionally, a combine of this type is disclosed in, for example, JP-A-63-313522, and as shown in FIG. It is provided so that the swinging operation a and the elevating operation b can be freely performed around the cantilevered fulcrum position 50. When the grain tank 51 becomes full or the like, the grain discharging auger 5 is raised from the storage position shown by the solid line. After raising the neck as shown by the imaginary line and turning continuously, lower the neck at a predetermined position and lower the neck, discharge the grains to the truck etc. laid side by side on the combine, and the opposite operation is performed at the time of storage. You can do it.

Usually, a hydraulic cylinder is used as an auger raising / lowering actuator 6 for raising and lowering the neck around the cantilevered fulcrum position 50 of the grain discharge auger 5, and the auger raising / lowering cylinder 6 moves the reaper 3 up and down. The cutting and lifting cylinder 4 is connected to a hydraulic line extending from a single pump together with the cutting and lifting cylinder 4. The hydraulic lifting circuit is combined with an automatic cutting height control mechanism and the like to raise and lower the cutting and lifting cylinder 4 used for normal work. A priority circuit that connects to the hydraulic line in preference to the cylinder 6 is provided, and the overall system configuration is simplified.

[0004]

When the auger lifting cylinder 6 is controlled to move up and down, it is possible to terminate the ascending and descending operations by using a sensor for detecting the ascending position and the descending position based on the sensor output. . However, in this case, the control circuit becomes complicated, and there are problems such as malfunction due to sensor failure.

On the other hand, when the control by timer management for connecting the auger elevating cylinder 6 to the hydraulic line for a predetermined time measured by a timer is performed, there is an advantage that the control circuit is simplified and troubles are reduced. However, when the mowing switch or the like is operated to connect the mowing elevating cylinder 4 to the hydraulic line preferentially while the auger elevating cylinder 6 is being driven up and down, the elevating drive of the auger elevating cylinder 6 is interrupted, and Before the grain discharging auger 5 raises its neck sufficiently high, the lifting operation is stopped and the turning operation is started, so that there is a problem that the grain discharging auger 5 collides with the upper member of the traveling machine body 100 and is damaged. .

SUMMARY OF THE INVENTION An object of the present invention is to employ a timer-based control, and perform simple and low-failure control while raising and lowering a grain discharge auger before it reaches a top dead center or a bottom dead center. It is an object of the present invention to provide a combine which can prevent the grain from being stopped and prevent a grain accident auger from being damaged.

[0007]

Therefore, in order to achieve the above object, as shown in FIG. 1, a cutting and lifting cylinder 4 for raising and lowering a cutting unit is mounted on a hydraulic line 2 extending from one pump 1 and a swivelable cylinder. An auger lifting / lowering command is input to a combine provided with a priority circuit 7 that connects an auger lifting / lowering cylinder 6 for raising / lowering a grain discharge auger and connects the cutting / lifting / lowering cylinder 4 to the hydraulic line 2 prior to the auger lifting / lowering cylinder 6. An auger lifting / lowering timer 8 for starting time counting, an auger lifting / lowering driving means 9 for connecting the auger lifting / lowering cylinder 6 to the hydraulic line 2 for a predetermined time counted by the timer 8,
When the mowing elevating cylinder 4 is preferentially connected to the hydraulic line 2 by the operation of the priority circuit 7 during the elevating operation of the auger elevating cylinder 6, the timing of the auger elevating timer 8 is interrupted, and the timing after interruption is canceled by releasing the priority connection. A timer timing suspending means 10 for resuming is provided.

[0008]

When the mowing lift cylinder 4 is preferentially connected to the hydraulic line 2 while the auger raising / lowering cylinder 6 is being driven up and down, the auger raising / lowering timer 8 is temporarily stopped. After all, the auger lifting cylinder 6
It is possible to raise and lower the grain discharge auger to a predetermined top dead center or bottom dead center position while simplifying the control device by adopting control by timer management and reducing failures. it can.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The mechanical structure of a combine according to the present invention is basically the same as that shown in FIG. 5, and the hydraulic circuit of the working machine is driven by an engine 11 as shown in FIG. A hydraulic line 2 extending from one pump 1 has a reaper 3
And an auger elevating cylinder 6 for raising and lowering a revolvable grain discharge auger 5. The cutting and lifting cylinder 4 is provided with a first electromagnetic switching valve 71.
The auger lifting / lowering cylinder 6 is connected to the downstream side of the hydraulic line 2 via a second solenoid-operated directional control valve 72 when the first solenoid-operated directional control valve 71 is at the illustrated position. 2 is connected to the second electromagnetic switching valve 72 side, when the first electromagnetic switching valve 71 is switched to the right or left position in the figure, the connection between the hydraulic line 2 and the second electromagnetic switching valve 72 is cut off, A priority circuit 7 for connecting the mowing lift cylinder 4 to the hydraulic line 2 in preference to the auger lift cylinder 6 is provided.

The cutting and lifting cylinder 4 is provided with a first electromagnetic switching valve 7.
1 is switched to the right position in the figure by the excitation of the ascending solenoid 71a, the back pressure is guided from the hydraulic line 2 via the check valve 41, and the first electromagnetic switching valve 71 is increased by the excitation of the descending solenoid 71b. By switching to the left position in the figure and moving the pilot operated valve 42 with the pressure oil of the hydraulic line 2 to open the pilot operated check valve 43, the back pressure is released to the tank line 13 communicating with the tank 12 through the variable throttle 44. Descended.

When the first electromagnetic switching valve 71 is at the position shown in the figure, the auger lifting cylinder 6 switches the second electromagnetic switching valve 72 to the right position in the figure by exciting the ascending solenoid 72a. The second solenoid-operated directional control valve 72 is switched to the left position in the figure by exciting the descending solenoid 72b, and the pilot operation is performed by the pressure oil of the hydraulic line 2 by raising the back pressure through the check valve 61 and the throttle 62. Opening the check valve 61 and releasing the back pressure to the tank line 13 lowers the tank.

Reference numeral 14 is a main relief valve, and 15 is an overload relief valve.

An auger elevating timer 8 which starts counting by inputting an auger elevating command taken from an auger elevating commander 900 by a manual switch or the like as a control device of the hydraulic circuit described above, and a predetermined time measured by the timer 8 An auger elevation drive means 9 for exciting the ascending solenoid 72a or descending solenoid 72b of the second electromagnetic switching valve 72 to connect the auger elevating cylinder 6 to the hydraulic line 2,
The solenoids 71a and 71b of the first solenoid-operated directional control valve 71 provided in the priority circuit 7 while the auger lifting cylinder 6 is being driven up and down.
When the mowing lift cylinder 4 is preferentially connected to the hydraulic line 2, the timer of the auger lifting timer 8 is interrupted,
When the priority connection is released, there is provided a timer timing suspending means for resuming timing after interruption.

In accordance with the procedure shown in FIG. 2, a series of controls are performed by inputting an auger up / down command (step a).
Is cleared (step b), the presence or absence of the priority connection by excitation of the first electromagnetic switching valve 71 is determined (step c). If there is no priority connection, the timer 8 is counted up (step d). If there is, the count of the timer 8 is stopped (step e), and the second electromagnetic switching valve 72 is stopped.
The excitation (step f) of the solenoids 72a and 72b of
After the total time period of the timer 8 reaches the set value (step g), the excitation is released (step h).

With the above configuration, the auger lifting cylinder 6
Even if the mowing lifting cylinder 4 is preferentially operated during the lifting drive, the auger lifting cylinder 6 is driven up and down over the total time period measured by the timer 8, so that the grain discharge auger 5 is stopped halfway. It can be moved up and down to a predetermined top dead center or bottom dead center position without any trouble.

FIG. 3 shows a comparative example, in which a pressure switch 63 operated by closing pressure is connected between the auger lifting cylinder 6 and the throttle 62, and as shown in FIG. In step i), the operation of the pressure switch 63 is determined (step j), and the second electromagnetic switching valve 72 is operated until the grain discharge auger 5 reaches the top dead center, the closing pressure increases, and the pressure switch 63 is turned on. While the excitation is continued (step k), the excitation is not released by turning on the pressure switch 63 (step m). However, since the closing pressure itself is unstable, the second electromagnetic switching valve 72 is not operated. Before canceling the excitation, it is necessary to determine whether the excitation time is extremely short (step n), and to output an alarm if the excitation time is extremely short (step p). And in the case of ascending drive, For descending drive, because it is difficult to use the closed-inclusive pressure, after all, can not help using a bottom dead center detection sensor, it is understood that this embodiment is advantageous.

[0017]

As described above, according to the present invention, the auger lifting / lowering cylinder 6 can be driven up and down over the actual time measured by the auger lifting / lowering timer 8, and the control device can be simplified by adopting control by timer management. It is possible to prevent the grain discharge auger 5 from lifting and lowering before going to the top dead center or the bottom dead center while preventing failures, and to prevent the grain discharge auger 5 from being damaged or the like. it can.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram of a working machine part in a combine of the present invention.

FIG. 2 is a control flowchart of the hydraulic circuit.

FIG. 3 is a main part hydraulic circuit diagram of a comparative example.

FIG. 4 is a control flowchart of the comparative example.

FIG. 5 is a side view of a conventional combine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Pump, 2; Hydraulic line, 3; Cutting part, 4; Cutting lifting cylinder, 5; Grain discharge auger, 6; Auger lifting cylinder, 7; Priority circuit, 8; Auger lifting timer, 9; 10, means for interrupting timer counting

Claims (1)

(57) [Claims] 1. A hydraulic lifting line (2) extending from one pump (1), a cutting lifting cylinder (4) for raising and lowering a cutting unit (3), and an auger for raising and lowering a pivotable grain discharge auger (5). The combiner provided with a priority circuit (7) for connecting the lifting cylinder (6) to the hydraulic line (2) prior to the auger lifting cylinder (6) by connecting the cutting and lifting cylinder (4). An auger elevating timer (8) for starting timekeeping by input; an auger elevating drive means (9) for connecting the auger elevating cylinder (6) to the hydraulic line (2) for a predetermined time measured by the timer (8); When the mowing elevating cylinder (4) is preferentially connected to the hydraulic line (2) by the operation of the priority circuit (7) during the elevating operation of the elevating cylinder (6), the timer of the auger elevating timer (8) is interrupted and the priority is interrupted. Connection Combine, characterized in that a resuming timer time interrupting means after interruption timing by dividing (10).