JPS5817564B2 - Combined harvester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical movement operating device for a reaping section in a combine harvester.

The control valve of the conventional hydraulic system for vertical movement of the reaping part has three positions (up, middle, and down), and the spring for returning to neutral, that is, the return spring, is normally held in the neutral position. An existing one (a spring center type in which the neutral position is held by both left and right springs) was used.

However, with these configurations, when the sensor for automatic mowing height control is directly linked, the return spring makes it impossible to hold the sensor in the neutral position1, making it impossible to perform automatic mowing height control. could not.

In addition, in order to solve this problem, if the sensor is biased in the direction of ground contact with another spring, the biasing force of the return spring activates a strong spring force due to the added force of both springs, pressing the sensing body strongly against the ground. There are disadvantages in that damage may occur, or conversely, the pressing force may become too weak due to the subtraction of both springs, and the present application aims to solve this problem.

In other words, in a combine harvester in which the reaping part is moved up and down by a hydraulic device, it is possible to automatically keep the cutting height constant according to the inclination of the machine body or unevenness of the field surface during combine work, and also to adjust the cutting height when the machine body is not operating properly. The automatic mowing height adjustment operation is stopped and switched to manual operation so that the reaping section can be operated up and down, and in particular, the hydraulic control valve mechanism of the hydraulic system is not equipped with a return spring to return it to a neutral state. A return spring is provided on the manual operation side and installed so that it operates only during manual operation, so that a mowing height detection body can operate smoothly and reliably without receiving extra force from the return spring. It is something.

1 Next, the embodiment shown in the drawings will be described.

Figure 1 shows a side view of the entire combine harvester, in which the rear lower part of the machine base 2 constructed above the track type traveling body 1 is rotatable around a fulcrum 3 supported on the track frame 1' side. A telescopic hydraulic system B consisting of a hydraulic cylinder and a piston rod is interposed between the front lower part of the machine base 2 and the front part of the truck frame 1'.
A cutter 4 is attached to the machine base 2 and a foot chain 15 is installed.
In front of the threshing device 6, there is a reaping section A supported by the front part of the machine stand 2. From the front to the rear of the reaping section A, there is a grass dividing plate 7. , a pulling body 8, a cutting blade 9, a conveying body 10, a vertical conveying body 11, etc., and a control platform 12 and a seat 13 are mounted on the front right side of the body. It is configured so that it rotates around the fulcrum 3 and the reaping part A side moves up and down by the maximum amount.

A sled-shaped sensing body C is attached to the support dividing rod 14 of the uncut side grass dividing plate 7 at the front of the machine, and a horizontal pin 15 is attached to the front of the sensing body C to the front of the grass dividing rod 14. The detection body C, which extends along the lower part of the weeding rod 14 to the side of the cutting blade 9, is configured to touch the ground and move up and down as it rotates. On the stand 2 is a drive device 1 having a pump structure connected to the hydraulic device B by a pipe 16.
7 is attached to the device 17, and a hydraulic control valve mechanism operated by a spool 18 is attached to the device 17.

An interlocking operation system is connected between the detection body C and the hydraulic control valve mechanism, and this system is a push-pull system between the switching operation device E provided on the side of the threshing device 6 and the detection body C. It is constructed by connecting a pull wire P and connecting a rod 19 between the switching operation device E and the hydraulic control valve mechanism.

...The switching operation device E is a case 20.
The support body 22 rotatably fitted onto the inner support shaft 21 and the base 2 or plate portion 23 of the operating lever F located on the side of the seat 13 are connected via a pin 24 orthogonal to the support shaft 21. A tension spring 25 is connected between the tip of the support 22 and the base 1 of the operating lever F, and both speed plates 26 and 27 are loosely fitted to the support shaft 21 on both sides of the operating lever F. - One end side portions of both speed plates 26 and 27 are bent so as to overlap with each other to form grooves 28 and 29, respectively, and grooves facing oppositely to the grooves 28 and 29.

28. Even if the operation lever F is inserted into 29 and each is operated, it is formed so that it does not contact the other groove side, and is loosely fitted to the support shaft 21 portion on the outside of one interlocking plate 27. A return spring S in the form of a tension spring is connected between the opposite ends of the plates 30 and 30', and a stopper 31 protruding from the case 20 is positioned between the moving plates 30 and 30'. A hooking piece 32 bent at the tip of the
are formed so as to engage with each other between the moving plates 30 and 30'.

Unlike the conventional structure, the return spring that returns the spool 18 to neutral in the hydraulic control valve mechanism is not installed inside the mechanism, but is configured so that the return spring S has that function, and is installed on the side of the mechanism. Bracket 3 in
-i honey oak 34' of bell crank 34 pivoted to 3
into the pin 35 of the spool 18, and then tighten the bell crank 34.
The other end of the rod 19, which is connected to the other end via a pin 36, is rotatably connected to the base of the operating lever F via a pin 37.

The push-pull wire P has a known structure for both push and pull operation, and has outer receiving portions G, G screwed with double nuts 38 and 38 at both ends thereof, and one of the outer receiving portions G is connected to the dividing rod. A rod 40 is inserted through and fixed to a support metal 39 supported by a rod 14, and the tip of a rod 40 extending from that part is connected to a sensing body C.
A supporting body 42 is connected to a connecting body 41 extending upwardly on the central side of the case 20, and the other outer receiving part G is inserted and fixed thereto, and is joined to a supporting body 42' fixed to the case 20. Bolt nuts 44 and 44 on the support body 42' side are inserted into the long holes 43.
The support body 42 is inserted into the case 20 so that it can be tightened freely.
The push-pull wire P is configured so as to be adjustable in the direction of operation so as to be adjustable in movement to the side.

Further, an interlocking rod 47 is inserted through a connecting body 46 attached to the other end of the interlocking plate 26 via a pin 45, and the tip of the rod 40 extending from the push-pull wire P is connected to the end of the interlocking rod 47. The connection part side and the connection body 46
A compression spring 48 is interposed in the interlocking rod 47 portion between the connecting body 46, and a double nut 49 as a stopper is screwed onto the tip of the interlocking rod 47 protruding outward from the connecting body 46, and fixed to the double nut 49. One end of a tension spring 51 is connected to the hook 50, and the other end of the tension spring 51 is connected to an end of an adjustment screw 53 inserted into a bracket 52 extending from the case 20. do.

Thus, in the combine harvesting operation, the separated planted culms are harvested and transported by the reaping section A, and threshed by the threshing device 6.

By the way, in order to automatically adjust the cutting height of the cutting part A1, that is, the cutting blade 9, the operator sitting on the seat 13 operates the control lever F to adjust the bottom of the groove 28 of the interlocking plate 26.
, the tension spring 25 moves beyond the dead center on the pin 24 and presses the operating lever F toward the bottom of the groove 28.

In this state, the rod 40 on the interlocking rod 47 side is pressed inward of the outer receiving part G by the tension of the tension spring 51, which has a higher tension than the compression spring 48, and the push-pull wire P operates to push the rod 40 on the other side of the outer receiving part G. Part G
The rod 40 is elastically operated in the protruding direction from the side, so that the sensing body C is elastically biased downward as shown by the imaginary line in FIG.

Therefore, when the machine moves forward during work, the sensing body C rotates around the pin 15 and moves up and down while touching the ground, adapting to the inclination of the machine and the unevenness of the field, and as it moves up and down, it connects. The rod 40 connected to the body 41 pushes and pulls toward the upper outer receiving portion G side, and the operation of the push-pull wire P causes the rod 40 on the other side to push and pull toward the Araku receiving portion G side.
At the same time, the interlocking rod 47 operates against the interlocking body 46 in the pushing direction through the elasticity of the compression spring 48 and in the pulling direction by being hooked by the stopper of the double nut 49. 26 is the spindle 21
The operating lever F, which rotates around the center and engages with the bottom of the groove 28 of the interlocking plate 26, rotates around the support shaft 21 as shown in phantom lines in FIGS. 4 and 5, and as shown in FIG. It can be rotated around the center.

In conjunction with the operating lever F that rotates in this way, the rod 19
is operated in the vertical direction, and the engagement between the fork portion 34' and the pin 35 via the bell crank 24 operates the spool 18 to operate the hydraulic control valve mechanism, which hydraulically operates the hydraulic system B. Then, the entire top of the machine stand 2 rotates around the fulcrum 3, and the reaping section A is adjusted vertically.

That is, as the sensing body C moves up and down, the hydraulic control valve mechanism is operated via the interlocking operation system to automatically adjust the cutting and cutting height of the cutting blade 9.

In addition, if you want to move the reaping section A up and down or manually adjust the reaping height when the machine is in operation, pull out the operating lever F from the bottom of the groove 28 of the interlocking plate 26 and swing it to the opposite side. It can be inserted into the bottom of the V-groove 29 of the other interlocking plate 27 as shown in FIG. Become.

From this state, when the operating lever F is rotated about the support shaft 21 as shown by the imaginary line in FIGS. 4 and 5, the hydraulic control valve mechanism can be operated via the rod 19, and the reaping Part A can be moved up and down, and the cutting height can be manually adjusted.

In this state, the connection between the sensing body C and the hydraulic control valve mechanism is cut off.

In this case, when the operation lever F is rotated manually and rotated downward from the neutral position A as shown in FIG.
Rotating around the center, the hook piece 32 hooks the actuating plate 30' and rotates it upward, while also extending the return spring S between it and the other actuating plate 30, which is locked by the stopper 31. , when the operating lever F is released, it moves back to the neutral position A due to the tensile force of the return spring S.
At the same time, the spool 18 can be operated to the neutral position via the rod 19, and when the operating lever F is rotated upward to the opening position, the actuating plate 30 is rotated in the opposite direction,
Similarly to the above, the operating lever F and the spool 18 are returned to the neutral position by the tensile force of the return spring S.

In addition, it may be necessary to change the standard value of the cutting height depending on conditions such as wet fields or lodging rice harvesting work, but in that case,
As shown in the figure, by loosening the bolt nuts 44 and 44 and aligning the support body 42 along the elongated hole 43, the support body 42 is adjusted and fixed in a telescopic state relative to the support body 42' on the case 20 side, and then it is supported by the support body 42. The position of the outer receiving part G can be moved in the operating direction, and the operating position of the rod 40 relative to the interlocking plate 26 can be changed to adjust the interlocking state, and the reference value of the cutting height can be adjusted. can.

Note that the interlocking can be finely adjusted by adjusting the adjustment screw 53 and the double nut 49.

As described above, the present invention provides a combine harvester in which the reaping section is moved up and down by a hydraulic device, in which a detection body that touches the ground at the front side of the reaping section and moves up and down, and a hydraulic control valve mechanism of the hydraulic device are arranged in the middle. An interlocking operation system in which automatic and manual switching operating devices are interposed enables interlocking, and a return spring for returning the hydraulic control valve mechanism to a neutral state is interposed in the switching operating device, and only during manual operation. Since the spring is configured to operate automatically, if the switching operation device is operated automatically, the hydraulic system will be activated automatically in response to the tilt of the machine or unevenness in the field while the sensing body is in contact with the ground. The mowing height can be kept constant, and when the machine is operating normally, the switching operation device can be switched to manual mode and the hydraulic system can be operated manually to operate the mowing section up and down. The structure can be configured so that the sensing body can be pressed to the ground side with a moderate spring pressure without the return spring acting, and mowing height control can be performed smoothly and reliably due to the sensing body that is not subjected to extra force. It has excellent features that allow it to be constructed and provided in such a way that it can be used.

,

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the combine, Fig. 2 is a side view showing the main parts, Fig. 3 is a side view of the front part of the reaping section, and Fig. 4 is a partially cutaway side view. Fig. 5 is an enlarged view of a part of Fig. 4, and Fig. 6 is an enlarged view of a part of Fig. 5.
7 is a top view of a portion of FIG. 6, FIG. 8 is a side view of a portion of FIG. 6, and FIGS. 9 and 10 are a top view of a portion of FIG. 11 is an explanatory diagram of the operation of FIG. 7. A...Reaping section, B...Hydraulic system, C.
...detection body, b, ...hydraulic control valve mechanism,
D: Interlocking operation system, S: Return spring, E: Switching operation device.

Claims (1)

[Scope of Claims] 1. A combine harvester having a structure in which a reaping part is moved up and down by a hydraulic device, comprising: a detection body that touches the ground at the front lower part of the reaping part and moves downward; and a hydraulic control valve mechanism of the hydraulic device. , an interlocking operation system having an automatic and manual switching operation device interposed therebetween enables interlocking, and the switching operation device includes a return spring for returning the hydraulic control valve mechanism to a neutral state. 1. A vertical movement operating device for a reaping section, characterized in that the spring is interposed so that it operates only during manual operation.