JPH0618419Y2 - Pretreatment unit height setting device for combine harvesters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a device for setting the height of a pretreatment unit in a combine.

<Prior art> The cutting height of the grain culm in the combine harvester is to be uniformly cut at the same height in the field under the same conditions depending on the soil quality of the field, the depth of the cultivated soil, the difference between wetlands and dry fields, etc. A mechanism that swings and raises and lowers the entire pretreatment section in order to adjust the mowing device up and down with respect to the combine body is generally known, and is shown in, for example, Japanese Utility Model Publication Nos. 55-166445 and 56-85535. In all of these technologies, the lower limit position of the hydraulic cylinder that swings the pretreatment unit is moved stepwise by operating the lever for operating the cylinder control valve, and the lower swing limit position of the pretreatment unit is stepped. To be set manually.

<Problems to be solved by the invention> However, in the above-mentioned conventional example, since the height adjustment of the pretreatment section is stepwise, even if the cutting height adjustment range of about 25 cm is adjusted in 10 steps, for example. There is a drawback that it is impossible to make small adjustments of 25 mm or less (actually, a 10-step adjusting device itself is almost impossible considering the installation conditions of the adjusting operation part).

There is also a method of installing a screw adjustment type under stopper that receives this on the machine side when the pretreatment section descends and adjust the lower limit position of the pretreatment section by adjusting the screw height. Since there is a need to adjust the screw of the lower stopper of the lower part, there is a drawback that the work is complicated and inefficient.

<Means for Solving Problems> An apparatus of the present invention for solving the above problems is
In a mechanism for setting the lowering stop position of the mounting pretreatment unit 2 so that the pretreatment unit 2 can swing up and down in front of the machine body 1, a pretreatment unit is provided between the swing operation unit of the pretreatment unit 2 and the pretreatment unit 2. 2 is provided with an interlocking part 25 that operates in conjunction with the swing, and a mechanism that drives the swing operation part is connected according to the operating amount of the interlocking part 25, and the operating amount of the interlocking part 25 is regulated. A rotary type stepless adjustment unit 24 is provided, and the rotary type stepless adjustment unit 24 is a body frame.
A restricting shaft 32 pivotally supported on the side of 10a, a restricting member 35 that rotates together with the restricting shaft 32, and a contact member such that the swinging posture changes according to the rotating position of the restricting member 35. It is characterized in that it comprises a relay lever 28 pivotally supported so as to be swingable, and the base end side of the interlocking portion 25 is connected to the swing end side of the relay lever 28.

<Operation> When the pretreatment unit 2 is lowered, the interlocking unit 25 interlocks with this and the adjusting unit 24 operates and stops by a preset drive amount, and when the pretreatment unit 2 further descends, the interlocking unit 25 moves. As a result, the rocking operation portion such as the hydraulic pump 7 is activated to stop the lowering of the pretreatment portion 2. By adjusting and setting the amount of movement of the end of the interlocking part 25 in advance in the adjusting part 24, the lower limit lowering position of the preprocessing part 2 can be set.

<Embodiment> As shown in FIG. 2 and FIG. 3, a pretreatment unit 2 is attached to the front of a combine body 1 so as to be swingable around a fulcrum 3, and rear ends 4 and 5 are the same as those described above. A transmission shaft and a swing rod that also serve as a pretreatment frame that is pivotally supported by the fulcrum 3. A hydraulic cylinder 6 for swinging the pretreatment section 2 is stretched between the lower surface of the transmission shaft 4 and the machine body 1 side, and the hydraulic cylinder 6 is driven by a hydraulic pump 7 attached to the machine body 1 side.

An operation lever 9 for valve-controlling the hydraulic pump 7 is provided near the driver's seat 8, and a lever shaft 11 rotatably supported by a frame 10a on the machine body is provided at a base end portion of the operation lever 9. Of the lever shaft 11 is fixed to the other end of the lever shaft 11, and the end of the rotating arm 12 and the end of the operation valve lever 13 of the hydraulic pump 7 are fixed. The spaces are connected by a rod 14, and the hydraulic cylinder 6 is operated by the swinging operation of the operating lever 9 so that the pretreatment unit 2 is vertically swung. The operating lever 9 is urged by a spring 15 so as to always return to the neutral position (hydraulic cylinder stop operating position) as shown in FIG. 1, and the pretreatment unit 2 is raised by tilting backward or forward. Or, it is a mechanism for descending.

An upwardly facing plate 16 is fixedly installed at the base end of the swing rod 5,
A safety lever 17 is attached to the side surface of the plate 16 so that its rear end is rotatably supported by a pin 18 so that the tip end of the safety lever 17 can swing up and down within a certain angle range. An arcuate slit 19 centered on the pin 18 is bored therein, and a guide pin 20 fixedly mounted on the plate 16 is housed in the slit 19, and in a normal state, the safety lever 17 is provided.
Is fastened to the plate side by a bolt head of the guide pin 20 or a nut screwed into the guide pin 20 in a posture of swinging downward with respect to the plate 16, and constitutes an interchange mechanism 23 described later.

One end of the inner wire 25b of the interlocking portion 25 including the outer wire 25a and the inner wire 25b is fixed to the tip of the safety lever 17, and the same end of the outer wire 25a is stopped by a wire stopper 26 projecting from the frame 10b. Outer wire
The other end of 25a is fixed to an actuating lever 27 that projects so as to rotate integrally with the rotating arm 12 or the lever shaft 11, and the inner wire 25b at the same end is locked to the upper end of a rear relay lever 28. Has been done.

The relay lever 28 is rotatably supported on the frame 10a side by a relay shaft 29 protruding laterally and via a bracket 30. The relay lever 28 is integrally rotated at the end of the relay shaft 29. The cam child 31 is provided so as to project. Above cam child 31
A regulating shaft 32 rotatably supported in the bracket 30 in a horizontal direction is erected at a position close to, and a knob 33 is attached to the upper end of the regulating shaft 32 and is pressed against the upper surface of the bracket 30. The disc spring 34 is fitted to the base end portion so that the regulation shaft 32 does not rotate accidentally.

A flange-shaped restricting member 35 is inclined and fixed to the restricting shaft 32, the upper portion of the cam member 31 contacts the lower surface of the restricting member 35, and the clockwise rotation of the cam member 31 (Fig. 1) is restricted. In addition, the clockwise rotation stop position of the cam 31 can be adjusted by the rotation of the regulating member 35 by changing the contact posture with the lower surface of the regulating member 35. As a result, the pull-in amount (movement amount) of the inner wire 25b fixed to the relay lever 28 can be adjusted and regulated, and the adjusting section 24 is constituted by a series of these mechanisms.

In the above mechanism, when the operation lever 9 is swung clockwise from the neutral position to lower the pretreatment section 2, the inner wire
25b interlocks with this to rotate the relay lever 28 in the clockwise direction, but this rotation causes the restriction member 35 set in advance to rotate.
When the cam element 31 abuts on the lower surface of the inner wire 25b and the pretreatment portion 2 continues to descend, the end portion of the outer wire 25a is pushed backward (left in FIG. 1) due to the contraction of the loop of the inner wire 25b, and The rotation causes the operation lever 9 to return to the neutral position, at which point the hydraulic pressure from the hydraulic pump 7 to the hydraulic cylinder 6 is controlled, and the lowering of the pretreatment unit 2 is also stopped.

As is clear from these actions, the relay lever is adjusted by adjusting the turning position of the regulating member 35 with the knob 32.
The right rotation limit position of 28 is set, and by this, the position at which the pretreatment unit 2 descends determines the operation lever 9 being neutral and stopping the descending thereof. Further, after the descent of the pretreatment unit is once stopped, when the pretreatment unit further descends due to a hydraulic system leak or the like, the operation lever 9 is tilted leftward to reach the ascending region, and the pretreatment unit is raised. You can also

An under stopper 38 is provided on the lower surface of the rocking rod 5 when the rocking rod 5 is lowered so that its height can be adjusted, and is attached to the machine body side frame 10c located there. And, unlike the above-mentioned cutting height setting mechanism, the under stopper 38 receives the load of the pretreatment section 2 at the lower part of the machine body by the frame 10c, and is used when the hydraulic pump 7 is not operating, for example, during storage. is there.

With the above mechanism that operates as described above, the under stopper
When the hydraulic pump 7 is stopped for a long time with the cutting height set by the pretreatment unit 2 by the regulating member 35 at a higher position than the position where 38 operates, the hydraulic system of the hydraulic cylinder 6 causes the pretreatment unit 2 to operate. Leakage due to the load, etc. causes the pretreatment unit 2 to further descend from the position where the cutting height is set. As a result, even if the operating lever 9 is tilted leftward from the neutral position and swings to the pretreatment rising position, the hydraulic pump 7 cannot be expected to return to the rising state of the pretreatment unit 2, and there is a risk that troubles such as cutting of the inner wire 25b may occur.

At this time, in the guide pin 20 which is the fastening portion between the safety lever 17 of the interchange mechanism 23 and the plate 16, the safety lever 17 is attached to the plate 16 so that the inner wire 25b is not subjected to all the downward loads of the pretreatment unit 2. And slipping to rotate upward within the arc of the slit 19 and before the pretreatment section 2 hits the under stopper 38, the inner wire 25b is cut and other troubles such as the relay lever 28 and the safety lever 17 are deformed. It is a mechanism to prevent the occurrence of. Such an interchange mechanism 23 is not limited to the lower end of the interlocking part 25, but may be provided at the end part on the adjusting part 24 side.

In the adjusting portion 24, the restricting shaft on which the restricting member 35 is rotationally adjusted is adjusted.
Although it is shown as being obliquely provided on 32, the other restricting member 35 is a disk-shaped nut, and the restricting shaft 32 is a bolt or a screw to rotate the disk-shaped nut to contact the cam element 31. It is also possible to adopt a configuration in which the position is adjusted.

Further, the adjusting portion 24 itself may be provided by forming a screw adjusting type joint at the fixed end or the fixed end of the inner wire 25b on the driver seat side.

<Effect of the Invention> Since the present invention is configured as described above, the adjustment setting of the lower limit position of the pretreatment unit, which should adjust the height of the pretreatment unit, is performed near the driver's seat by an arbitrary and extremely simple operation. ,
Moreover, since it can be adjusted steplessly, there is an advantage that the cutting height can be accurately and easily adjusted and set according to various conditions of the mowing field.

In particular, the lower limit of the interlocking part is connected near the fulcrum of the oscillating part of the pretreatment part, and even if a strong pulling force acts on the inner wire of the interlocking part, the rotary member is restricted by the swaying restriction of the relay lever by the restricting member. If a member is used, the fixing reaction force at the end of the interlocking part is strong, and unlike the brake fixing and the like, there is an effect that it can be set at an extremely accurate position like the electric adjustment setting.

Moreover, since the mechanism of the present invention can be composed of simple parts, it can be easily installed in a conventional combine harvester, and it can be easily controlled even if it breaks down because it is electrically controlled and it is significantly cheaper. is there.

Further, since the cutting height is adjusted by adjusting the rotation of the regulating shaft and the regulating member, it is not necessary to provide a swinging lever for adjustment unlike the conventional case in the vicinity of the driver's seat, and it is necessary to provide a working space for the lever. Does not interfere with other operations, and malfunctions associated with other operations do not occur.

[Brief description of drawings]

FIG. 1 shows an embodiment of the device of the present invention. FIG. 1 is an extracted side view of an essential part of the device, FIG. 2 is a perspective view showing a state in which the device of the present invention is assembled to a combine, and FIG. FIG. 4 is an overall perspective view of FIG. 4, and FIG. 4 is a plan view of the cutting height setting device. 1: Airframe, 2: Pre-processing unit 7: Hydraulic pump, 9: Operating lever 24: Adjusting unit, 25: Interlocking unit 25a: Outer wire, 25b: Inner wire

Claims (1)

[Scope of utility model registration request] 1. A mechanism for setting a lowering stop position of a mounting pretreatment unit (2) such that the pretreatment unit (2) can swing up and down in front of an airframe (1), and swinging of the pretreatment unit (2). Interlocking part (25) that operates in conjunction with the swing of the pretreatment part (2) between the operation part and the pretreatment part (2)
And a rotary type continuously variable adjusting section (24) for connecting the mechanism for driving the swing operation section according to the operation amount of the interlocking section (25) and for restricting the operation amount of the interlocking section (25). The rotary stepless adjustment section (24) is provided with a restriction shaft (32) rotatably and rotatably supported on the body frame (10a) side, and a restriction member that rotates together with the restriction shaft (32). 35) and a relay lever (28) pivotably supported so that the swinging posture changes according to the rotation position of the regulating member (35).
A pretreatment unit height setting device in a combine, in which the swing end side of (28) is connected to the base end side of the interlocking unit (25).