JPS5844329B2 - Automatic handling depth control device for combine harvesters - Google Patents

Description

[Detailed Description of the Invention] In recent years, in combine harvesters, in order to operate the threshing device with an appropriate load, the handling depth adjustment mechanism is automatically controlled based on the detection result of the threshing load to maintain the threshing load within a certain range. Means are being considered.

In this case, when the amount of shell culm supplied is large or the shell culm is wet, the handling depth adjustment mechanism is operated to the shallow handling side as the threshing load increases, and the amount of shell culm inserted into the threshing device is adjusted. There was a problem that the amount could become extremely low, resulting in unused items.

The present invention aims to solve such problems,
The threshing device is provided with a mechanism for detecting the insertion amount of shell culm, and is configured to stop the operation of the handling depth adjustment device when the detection result of the insertion amount of shell culm reaches at least a preset minimum limit. shall be.

That is, as the threshing load increases, the amount of culm inserted into the threshing device is reduced, and when a preset minimum limit is reached, further shallow handling is automatically prevented, so that the load is sufficiently reduced. Although there is a decrease in threshing efficiency due to the fact that the threshing is not carried out properly, the generation of a large amount of unhandled grain due to extremely shallow handling is prevented, and large threshing losses are no longer caused due to load stabilization, which improves the overall threshing efficiency. It was possible to raise it.

Embodiments of the present invention will be described below based on illustrative drawings.

FIG. 1 shows a side view of the combine harvester, in which the culm harvested by the pulling-up reaping section 1 at the front end of the machine is supported by a rear conveyance device 4 consisting of a tip-locking conveyance chain 2 and a stump-clipping conveyance chain 3. The grain is conveyed rearward and upward while gradually changing its posture from a standing position to a sideways position, and is delivered to a feed chain 6 of a threshing device 5 mounted at the rear of the machine.

Figure 2 shows a schematic plan view of the cut husk conveying section and the threshing section.
The stock holding chain 3 of the rear conveyance device 4 is configured to be able to swing laterally around the starting end of the conveyance by the expansion and contraction of the hydraulic cylinder 7, so that the gripping position of the husk with respect to the feed chain 6 can be changed to operate the threshing device. A handling depth adjustment mechanism 8 is configured to adjust the amount of insertion of the culm into the shell 5.

Further, the handling barrel shaft 9 of the threshing device 5 is provided with a load detection mechanism 11 that detects the threshing load acting on the handling barrel 10 as shaft torque, and the detection result is used to control the electromagnetic valve 12 that operates the hydraulic cylinder 7. When the threshing load is input to the mechanism 13 and therefore exceeds a preset certain range, the electromagnetic valve 12 is operated in the forward or reverse direction to extend or shorten the hydraulic cylinder 7 of the handling depth adjustment mechanism 8, The hydraulic cylinder 7 is configured to be kept at a neutral stop when the load is within a certain range.

In addition, three shell culm contact sensors S1. S2. S8 are provided and these sensors S1. S2. A mechanism 14 is configured to detect the amount of culm insertion through contact and non-contact detection in S3, and the detection result is input to the control mechanism 13.

The control mechanism 13 performs the following control based on the detection result of the culm insertion amount detection mechanism 14.

■ Sensor S1. S2. When all S3 sense the culm (hereinafter referred to as ON), that is, when a deep handling state in which the tip of the tip exceeds the innermost sensor S3 toward the tip side is detected, the handling depth adjustment mechanism 8 A signal for operating the hydraulic cylinder 7 to the shallow handling side is input to the electromagnetic valve 12.

■ Only sensors S1*S2 are turned on and the tip of the ear is connected to sensor S3. S2 (appropriate root depth range), the solenoid valve 12 is maintained neutral, and at this time, the solenoid valve 1 is kept neutral based on the detection result of the threshing load detection mechanism 11.
2 to perform depth control to maintain the load within a preset range.

(2) When only the sensor S1 is turned on and the root depth falls outside the appropriate root depth range to the shallow treatment side, deep treatment depth control is performed.

■ All sensors S1. S2. When all S3 no longer sense the culm, the automatic control for adjusting the handling depth is stopped.

In the embodiment, three sensors S1. S2. The culm insertion amount detection mechanism 14 was configured using S3, but S3 was removed and sensor S1. It is also possible to carry out the handling depth adjustment control according to the threshing load when both S2 are ON.

Furthermore, in addition to regulating the minimum limit of the amount of culm insertion, it is also possible to regulate the maximum limit.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the automatic handling depth control device for a combine harvester according to the present invention, and FIG. 1 is an overall side view of the combine harvester, and FIG. 2 is a schematic plan view showing the interlocking relationship of the handling depth control device. be. 5... Threshing device, 8... Handling depth adjustment mechanism, 14... Culm insertion amount detection mechanism.

Claims (1)

[Claims] 1 In a combine equipped with an automatic control mechanism that detects the load on the threshing device 5 and automatically maintains the threshing load within a certain range by operating the handling depth adjustment mechanism 8 based on the detection result, the threshing device 5 is provided with a detection mechanism 14 for the insertion amount of the shell culm, and is configured to stop the operation of the handling depth adjustment device 8 when the detection result of the insertion amount of the shell culm reaches at least a preset minimum limit. Features: Automatic handling depth control device for combine harvesters.