JPS5841812Y2 - combine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a combine harvester equipped with automatic control devices such as an automatic steering device, an automatic handling depth adjustment device, and an automatic cutting height adjustment device.

Recently, combine harvesters are being equipped with automatic control devices such as those described above.

The automatic steering device detects the relative positional relationship between the grass cutting board and the uncut culm row, and controls the hydraulic circuit based on this detection result.
The rotation of one of the crawlers is stopped and the direction is corrected toward that crawler, thereby allowing the aircraft to travel along the culm row.

The automatic handling depth adjustment device detects the length of the cut culm being conveyed by the vertical conveyance chain at the front of the handling cylinder, controls the hydraulic circuit based on the detection result, and controls the vertical conveyance. By changing the angle of inclination of the chain, the part of the feed chain that pinches and conveys the shell culm when feeding the shell culm to the handling cylinder is changed, depending on the length of the shell culm. This makes it possible to adjust the depth of treatment.

The automatic cutting height adjustment device detects the height position of the grass dividing board from the ground surface, and controls the hydraulic circuit based on this detection result.
It is possible to adjust the cutting height to within a predetermined range by raising and lowering a cutting section consisting of a grass dividing board, cutting blades, etc., and changing the height position of the cutting blades.

It is desirable for the above automatic control devices to adjust the running direction, handling depth, and cutting height quickly, but in many cases the factors that require adjustment of the running direction, etc. are resolved within a short time. If quick adjustment is performed in such a case, the adjustment operation will be performed unnecessarily frequently, resulting in a pinching phenomenon, which will actually impede smooth operation.

In order to solve this problem, the solenoid of the electromagnetic directional control valve provided in the hydraulic circuit to switch the oil path and control the operation of the hydraulic cylinder is intermittently energized. the direction of travel, which is carried out by the action of a hydraulic cylinder;
The applicant has proposed an automatic steering device for a combine or a combine harvester, an automatic handling depth adjustment device, and an automatic cutting height adjustment device that adjust the handling depth or cutting height intermittently and gradually. (Japanese Patent Application No. 50-151050, Utility Application No. 51-121521).

Therefore, the present invention provides an intermittent switching member such as a pulse generator that intermittently energizes the solenoid of the electromagnetic directional control valve in each automatic control device in a combine harvester equipped with multiple types of automatic control devices as described above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to drawings showing embodiments thereof, with the aim of providing a combine harvester with a simplified configuration by allowing one combine harvester to be shared by a plurality of automatic control devices.

FIG. 1 schematically shows a hydraulic circuit 10a of an automatic steering system and a traveling direction detecting section 10b provided on a left grass dividing plate 11 for controlling the hydraulic circuit 10a.

When the steering sensor 12, which is rotatably fixed to the grass dividing plate mounting shaft 11a, moves to the right (left), the distance from the culm row 40 becomes small (large). The sliding rod 13 is pressed by the culm and rotates backward (pulled forward by the spring 13'), thereby being connected to the steering sensor 12.
The protrusion 13a moves forward (rearward), and the detection switch S7. Sr.
When the detection switches St and Sr come into contact with each other, the normally open contacts of the detection switches St and Sr are closed.

This detection switch S7. By closing Sr, the solenoids 5OL7 and 5QLr of the 4-point/3-position switching type electromagnetic directional control valve 14 are energized, as described later, and the electromagnetic directional control is performed by energizing the solenoids 5OLt and 5OLr. Valve 14 is in switching position t.

r, the piston rod 15a of the double-rond hydraulic cylinder 15 connected to the electromagnetic directional control valve 14 moves to the left (right), thereby controlling the drive of the left (right) crawler. Disengage the left (right) side clutch and operate the left (right) brake.
“The left (right) crawler is stopped and the running direction is corrected to the left (right).

Next, FIG. 2 schematically shows the hydraulic circuit 20a of the automatic handling depth adjustment device and the grain culm length detection section 20b provided in front of the handling barrel 21 for controlling the hydraulic circuit.

The culm 50 being conveyed by the vertical conveyance chain 22 comes into contact with a detection switch SC consisting of a limit switch provided in the middle of the vertical conveyance chain 22, which indicates that the culm 50 is being conveyed by the vertical conveyance chain 22. is detected and its normally open contact closes, and if the shell culm 50 is long (short), the shell culm 50 comes into contact with both detection switches Sh and Sm, both of which are limit I switches. (no contact)
, only the normally open contact of the detection switch sh (the normally closed contact of Sm) is closed.

By closing the detection switches Sc, Sh, and Sm, the solenoids 5OLh and SOLm of the 4-point/3-position switching type electromagnetic directional control valve 23 are energized, as will be described later.

By energizing S and OLm, the electromagnetic directional control valve 23 moves to the switching position m, and the piston rod 24a of the hydraulic cylinder 24, which is connected to the electromagnetic directional control valve 23, moves forward (backward). The vertical conveyance chain 22 is overturned (
The inclination angle of the culm 50 is changed so that the feed chain 25 performs deep plating (deep handling).
is transferred from the vertical conveyance chain 22 to the feed chain 25.

Further, FIG. 3 schematically shows the hydraulic circuit 30a of the automatic cutting height adjustment device and the cutting height detection section 30b attached to the grass dividing plate mounting shaft 31a of the right side grass dividing plate 31 for controlling the hydraulic circuit. ing.

The sensor arm 32 rotatably attached to the grass dividing plate mounting shaft 31a has a large (small) distance between the grass dividing plate 31 and the ground surface E.
In the case of
Of the two detection switches Sd and Su consisting of Isuemo limit switches, the detection switch Sd is located below.
(detection switch Su disposed above), and the normally open contacts of the detection switches Sd and Su are closed.

By closing the detection switches Sd and Su, the solenoids 5OLd and 5OLu of the 3-point, 3-position switching type electromagnetic directional control valve 34 are energized, as will be described later. When energized, the electromagnetic directional control valve 34 is in the switching position d.

U, and the piston rod 35a of the single-acting hydraulic cylinder 35 connected to the electromagnetic directional control valve 34 descends (rises).
The reaping section supported by the piston rod 35a also descends (
) and the distance between the grass dividing board 31 and the ground surface is small (dog)
In other words, the cutting height is lowered (higher).

The electrical circuit of the automatic control device described above is constructed as shown in FIG.

In FIG. 4, 1 is a battery, 2 is a combine key switch, and 3 is a pulse generator that repeatedly generates a pulse signal with a predetermined time width. The pulse time width is the resistance of a variable resistor 3R connected between the positive electrode line, which is turned on and off by the key switch 2, and the discharge terminal A of the timer IC 3'. A desired value can be selected depending on the value.

The above-mentioned six solenoids 5OL are connected to the positive electrode line.
7,5QLr, 5OLh, SOLm.

One end of 5OLd and 5OLu are connected to each other, and the other end of each of these solenoids is a switching circuit 4t formed by connecting two transistors in a Darlington connection.

Connected to body ground via 4r, 4h, 4m, 4d and 4u.

The switching circuits 41.4r, 4h, 4m, 4
Switching signal input terminals 41' and 4 of d and 4u, respectively.
r', 4h', 4m'.

4d' and 4u' are connected to the normally open contact S t a % detection switch Sr of the detection switch St via a current limiting resistor, respectively.
normally open contact Sra, normally open contact Sha of detection switch sh
, the normally closed contact Sm of the detection switch Sm, the normally open contact Sda of the by detection switch Sd, and one end of the normally open contact Sua of the detection switch Su are connected, and the normally open contacts Sea, Sra
, Sda and Sua are directly connected to the output terminal port of the timer IC 3', and the other ends of the normally open contact Sha and the normally closed contact Smb are connected together through the normally open contact Sea of the detection switch Sc. It is connected to the output terminal port.

Note that a surge absorption diode is connected in parallel to each solenoid.

The combine harvester according to the present invention configured as described above is started when the key switch 2 is turned on, and the pulse generator 3 is energized to the power terminal C of the timer IC 3' when the key switch 2 is turned on. A pulse having a desired time width determined by the resistance value of the variable resistor 3R is repeatedly emitted from the output terminal.

By the way, if the traveling direction of the combine is to the right and the steering sensor 12 is rotated backward and the normally open contact Sta of the detection switch St is closed, the above-mentioned repetitive pulses will pass through the closed normally open contact Sta. Since the input is input to the input terminal 4t' of the switching circuit 4t, the solenoid 5OLt is energized intermittently, thereby causing the electromagnetic directional control valve 14
performs repeated switching between the switching position t and the neutral position n, and the piston rod 15a of the hydraulic cylinder 15 gradually moves to the left step by step.

Therefore, the left crawler is gradually decelerated, and the traveling direction of the combine is gradually corrected to the left in accordance with this deceleration.

The above operation applies not only to the solenoid 5OLt but also to the other solenoids, since the repetitive pulses are inputted to the respective input terminals of the switching circuits connected to each solenoid via the contacts of each detection switch. The energization is performed intermittently as before.

Therefore, all of the rightward travel direction correction, handling depth adjustment, and cutting height adjustment are performed intermittently and gradually.

For this reason, according to the present invention, automatic control by each device is performed in an extremely ideal manner, and it is possible to avoid the phenomenon in which adjustment operations as described above are performed unnecessarily frequently, as well as avoid the risk of excessive correction. All of them will be gone.

Furthermore, in a combine harvester, the oil pressure varies depending on the engine rotation speed, and in particular, when the engine rotates at high speed, the oil pressure increases when the engine rotates at high speed, and the operating speed of the hydraulic cylinder becomes too fast, which tends to lead to over-correction. This inconvenience can also be solved by intermittent driving.

Moreover, in the combine harvester according to the present invention, one pulse generator 3 is commonly used for controlling the energization of each automatic control device, so according to the present invention, the electric circuit can be configured simply and at low cost, and maintenance This has the advantage of making it easier.

Furthermore, driving each automatic control independently and intermittently complicates the automatic control circuit, and at the same time, there is a possibility that the husband's automatic controls will interfere with each other, and stable automatic control will not necessarily be performed. The combine harvester according to the present invention, in which one intermittent switching member is shared for controlling the energization of each automatic control device, does not have such inconvenience, and economical automatic control is possible.

In the above embodiment, the pulse generator 3 is used as an intermittent switching member that energizes each solenoid at predetermined time intervals -f, but instead of this, the opening and closing operations are repeated at predetermined time intervals. Using a timer switch, connect the timer switch in series with the normally open contact or normally closed contact of each detection switch in the same way as the pulse generator 3, and further connect each solenoid in series with each normally open contact or normally closed contact. , these series circuits are connected between the positive electrode line and the body ground, and the energization to the direct contact solenoid is turned on and off by closing the timer switch and each normally open contact or normally closed contact. Even in this case, the same effect as in the above embodiment can be obtained.

Although the above description has been made regarding a combine harvester equipped with three types of automatic control devices, it goes without saying that the present invention can be implemented in a combine harvester equipped with two or more types of automatic control devices.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the hydraulic circuit and running direction detection section of the automatic steering device, Fig. 2 is a schematic diagram of the hydraulic circuit and grain culm length detection section of the automatic handling depth adjustment device, and Fig. 3 is a schematic diagram of the grain culm length detection section. FIG. 4 is a schematic diagram of the hydraulic circuit and cutting height detection section of the automatic height adjustment device, and FIG. 4 is a circuit diagram of the main part of the electric circuit of the combine harvester according to the present invention. 3... Pulse generator, I Da , 20a,
30a...Hydraulic circuit, 14, 23, 34...
...Solenoid directional control valve, 15, 24.35...
Hydraulic cylinder, St. S r t S c * S h t S ms S
d t S u "・"・Detection switch, 5OLt, 5
QLr, 5OLh, SOLm. 5OLd, 5OLu... Solenoid.

Claims (1)

[Scope of utility model registration request] By controlling the supply of electricity to the solenoid of each electromagnetic directional control valve provided in the hydraulic circuit on/off based on the opening/closing operation of each detection switch, the oil path is switched, and each hydraulic cylinder is operated. Two or more types of automatic control devices among automatic control devices such as automatic steering devices that perform steering direction, handling depth adjustment, or cutting height adjustment, automatic handling depth adjustment devices, or automatic cutting height adjustment devices. In a combine equipped with a directional control valve, an intermittent switching member is provided in the electric circuit of the combine to emit repetitive pulses or perform repetitive opening/closing operations, and to energize the solenoid of each electromagnetic directional control valve of the respective automatic control device. , A combine harvester characterized in that the one intermittent switching member performs the operation intermittently and synchronously.