JPH11275943A - Angle sensing unit for rotary section of combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angle sensing unit of simple structure capable of sensing angle of a rotary section of combine harvester without being affected by back- lash by arranging a specific cam body and a sensor which senses a relative position between the cam plane and a fixed point. SOLUTION: This unit is obtained by fitting a cam body 15 having a continuous cam plane C with respect to a rotary member 11a around its rotary axis core Z, and also setting a position sensor which continuously senses a relative position between the cam plane C of the cam body 15 and a fixed point. It is preferable that the cam body 15 is designed in such a way that the cam plane C continuously changes in the direction of the rotary axis core Z of the rotary member 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an angle of a rotating part of a combine for detecting a rotation angle of a rotating part which is rotated, such as an unloader device.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for detecting the angle of a rotating part of a combine, for example, as shown in FIG. 6, a rotating angle of a horizontal feed screw conveyor 11 of an unloader device 7 around a vertical axis Z is detected. In addition, a large-diameter gear 14 is provided on the outer periphery of the rotating body, and a pinion gear 13a gear-linked to the large-diameter gear 14 is provided.
There is known a structure in which a potentiometer 18b capable of performing multi-rotation angle detection is provided so as to detect the rotation amount of the rotation.

[0003]

However, in the potentiometer 18b for detecting the rotation angle as described above,
It is more expensive than a potentiometer that can detect the angle only within one rotation, and the angle is detected via gears. There is a high possibility that an error occurs in the detection angle between after the rotation and after the rotation, and there is also a problem that it is difficult to perform highly accurate detection.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a combine rotating part angle detecting device capable of detecting the rotating part angle without the influence of backlash with a simple structure. With the goal.

[0005]

According to the present invention, there is provided a rotating part angle detecting device for a combine having a cam body having a continuous cam surface around a rotating shaft center with respect to a rotating member. And a position detection sensor for continuously detecting the relative position between the cam surface of the cam body and the fixed point is provided.

(Operation) According to the structure of the first aspect of the present invention, the position detection sensor determines the relative position between the position detection sensor fixed and installed at a fixed position and the cam surface of the cam body provided on the rotating body. By detecting, the rotation angle and its relative position, that is, the distance between the cam surface and the position detection sensor, corresponds to the rotation angle position of the rotating body, so the rotation angle of the rotating member is indirectly detected. Will do. Therefore, detecting the relative position with respect to the cam surface can directly detect a position change in a relatively small range without using a gear or the like, and even if the detection is performed with a potentiometer, for example, within one rotation range. Only inexpensive ones that can detect angles can be used.

(Effects) Therefore, according to the configuration of the first aspect of the present invention, since an angle detection sensor having a small detection range can be adopted, it is possible to reduce the influence of backlash, while being able to be configured at low cost. The angle can be detected without receiving the signal, and the detection accuracy can be improved.

(Structure) According to a second aspect of the present invention, in the combine rotating part angle detecting device according to the first aspect, the cam body has a cam surface in a direction of the rotation axis of the rotating member. Is configured to change continuously.

According to the second aspect of the present invention, the cam surface of the cam body is configured to continuously change in the direction of the rotation axis of the rotating member. Can be provided as close as possible to the rotating member, and can be configured so as not to protrude significantly in the radial direction of the rotating member.

(Effect) Therefore, according to the configuration of the second aspect of the present invention, the cam body can be provided in a state close to the rotating member, and the cam body does not protrude significantly in the radial direction. Therefore, the angle detecting means can be made compact, and the risk of the angle detecting means coming into contact with another object can be suppressed.

(Structure) According to a third aspect of the present invention, in the combine rotating part angle detecting device according to the first or second aspect, a cam is provided at a specific position around the rotation axis in the cam body. A feature is that a portion where the surface changes suddenly is provided.

(Operation) According to the configuration of the third aspect of the present invention, it is possible to increase the reliability of specifying and detecting the predetermined rotation angle position of the rotating member by the suddenly changing portion of the cam surface.

(Effects) Therefore, according to the configuration of the third aspect of the present invention, there is an advantage that the detection of the specific position can be detected with high reliability without providing another detection means such as a limit switch.

(Structure) According to a fourth aspect of the present invention, in the combine rotating part angle detecting apparatus according to the third aspect, the suddenly changing portion of the cam surface is limited to a rotation limit of the rotating member. A characteristic configuration is that it is set corresponding to the position.

(Operation) According to the configuration of the fourth aspect of the present invention, since the abruptly changing portion of the cam surface is set corresponding to the rotation limit position of the rotation member, the limit position is exclusively used. A limit switch for detection can be eliminated.

(Effects) Therefore, according to the configuration of the fourth aspect of the present invention, since the limit switch can be eliminated, the configuration can be made compact and the cost can be reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an example of a combine. In this combine, a cutting pre-processing device 3 is mounted on a front end portion of a body frame 2 supported by a pair of left and right crawler traveling devices 1 and 1 so as to swing up and down around a horizontal axis and threshing on the body frame 2. The apparatus 4 is equipped with onboard equipment, a boarding operation unit 5, a Glen tank 6, and the like.

The Glen tank 6 is provided with an unloader 7 for discharging the grains in the Glen tank 6. The unloader device 7 includes a bottom screw conveyor 8 disposed at the bottom of the Glen tank 6 along the front-rear direction, and a vertical feed for lifting transported grains from the rear end of the bottom screw conveyor 8 at the rear side of the Glen tank 6. The screw conveyor 9 is provided with a horizontal feed screw conveyor 11 for feeding the grains fed by the vertical screw conveyor 9 sideways and discharging the grains from a grain discharge port 10 at the end. The horizontal feed screw conveyor 11 is swingable around the vertical axis Z with respect to the vertical feed screw conveyor 9 (swing is possible in the rotation range between the arrows shown in FIG. 2), and is horizontal about the horizontal axis X. It is configured to be able to swing up and down freely. FIG. 2 shows a state in which the lateral feed screw conveyor 11 is located at a home position as a storage position.

As shown in FIGS. 3A and 3B, a cylindrical screw case 9a of the vertical feed screw conveyor 9 is provided.
A vertically oriented cylindrical screw case 11a at the base end of the lateral feed screw conveyor 11 is rotatably fitted around the vertical axis Z and fixed to the fixed cylindrical screw case 9a side. Via a pinion gear 13 driven forward and reverse by a driven electric motor 12 and a large-diameter gear 14 meshing with the pinion gear 13, and thus the cylindrical screw case 11 a and, consequently, the lateral feed screw conveyor 11.
Are driven to rotate around the vertical axis Z.
Then, as shown in FIG. 3B, the cam body 15 having the cam surface C continuously changing in the direction of the vertical axis Z, that is, the cam surface C inclined at a constant inclination angle with respect to the horizontal plane, is oriented in the vertical direction. It is attached to the outer peripheral surface of the cylindrical screw case 11a over substantially the entire circumference around the vertical axis Z. This cam body 1
Cam follower 1 consisting of a roller contacting cam surface C of No. 5
An arm 17 having one end 6 is integrally attached to an angle detection shaft 18a of a potentiometer 18 as a position detection sensor fixed to the cylindrical screw case 9a side via a mounting bracket B. Although not shown, the cam follower 1
Numeral 6 resiliently urges the side contacting the cam surface C. The potentiometer 18 is configured to be able to detect an angle only within one rotation, and a detection signal is input to a control device 19 mounted on the body. Further, the boarding operation unit 5
In order to automatically turn the horizontal feed screw conveyor 11 from the home position to a predetermined position and stop it, a potentiometer 20 linked with a dial as a stop position setting tool for setting the predetermined position is provided. And a manual operation command switch S2 for artificially turning the horizontal feed screw conveyor 11 to the left or right, and a potentiometer 20, a start switch S1 and a start switch S1. The signal from the manual operation command switch S2 is transmitted to the control device 19
Is input to Then, when an automatic turning command of the transverse screw conveyor 11 is issued by the ON signal from the start switch S1, the control device 19 compares the detection signal from the potentiometer 18 with the angle command signal from the potentiometer 20. The configuration is such that control is performed to output a drive signal to the electric motor 12 so that the horizontal feed screw conveyor 11 is rotated to an angular position corresponding to the angle command signal. Further, the control device 19 is configured to automatically turn and return to the home position when the start switch S1 is turned on when the lateral feed screw conveyor 11 is not at the home position.

Therefore, according to the above configuration, the cam follower 16 in contact with the cam surface C is displaced in the vertical direction in accordance with the change in the position of the cam surface C due to the rotation of the vertical screw case 11a as a rotating member, Since the angle detection shaft 18a connected to the arm 17 converts the displacement in the vertical direction into an angle change, and the angle is detected by the potentiometer 18, the angle of the arm 17 with respect to the position of the angle detection shaft 18a as a fixed point is determined. Due to the change in the relative angle, the relative position of the potentiometer 18 with respect to the cam surface C, and thus the angular position of the vertical screw case 11a around the vertical axis Z are detected. Further, portions corresponding to the clockwise and counterclockwise rotation limit positions on the cam surface C are constituted by abruptly changing portions 21 and 22 in which the angle change becomes steeply inclined, and the angle detected on the potentiometer 18 side. Since the change can also suddenly change at the limit position and reach the desired detection angle position with high certainty, the home position and the limit position on the opposite side can be clearly detected, and the stopping operation can be performed with high certainty. Even if there is no limit switch, overrun beyond the home position can be prevented.

[Another Embodiment] As a position detecting sensor, a non-contact type distance measuring sensor using a laser beam or the like is used. The distance may be detected to detect a change in the relative position of each other due to the rotation of the rotation member, and the detection result may be converted to angle detection. As shown in FIGS. 4A and 4B, the vertical screw case 11 at the base end of the horizontal feed screw conveyor 11 is provided.
a screw case 9 of a vertical feed screw conveyor 9
To detect the relative angle around the vertical axis Z with respect to a,
Instead of the structure of the above-described embodiment, the cam surface C of the cam body 15 may be configured so that the position in the radial direction centered on the longitudinal axis continuously changes. Although not shown, the cam follower 16 is elastically biased toward the side that comes into contact with the cam surface C. As shown in FIG. 5, an upper chain-type waste straw transport device 25 for transferring the waste straw after threshing to the rear waste straw shredding device 23 or the binding device 24 is provided. In order to change the end position of the waste straw transport, the means for driving the rear movable rail 26a to move forward and backward with respect to the front fixed rail 6b of the clamping rails 26 for clamping and transporting the waste straw in cooperation with the chain. The present invention may be adopted. More specifically, a wire 27 having both ends connected to a movable rail 26a at two front and rear ends is wound several times around a drum 28 as a rotating member, and the drum 28 can be rotationally driven by an electric motor 29.
In order to detect the rotation angle position of the drum 28 corresponding to the retracted position of the drum 28, the cam body 29 that rotates integrally with the drum 28
And an arm 31 provided at one end with a cam follower 30 formed of a roller abutting against a cam surface C whose position in the radial direction with respect to the rotation center of the drum 28 of the cam body 29 continuously changes. It is configured to be integrally attached to an angle detection shaft 32a of a potentiometer 32 as a position detection sensor. Although not shown, the cam follower 30 is elastically biased toward the side that comes into contact with the cam surface C.

[Brief description of the drawings]

FIG. 1 is an overall side view showing a combine.

FIG. 2 is an overall plan view showing a combine;

FIG. 3 is a cross-sectional plan view (a) and a side view (b) showing a rotation angle detecting structure of a lateral feed screw conveyor.

FIG. 4 is a cross-sectional plan view (a) and a side view (b) showing a rotation angle detecting structure of a lateral feed screw conveyor according to another embodiment.

FIG. 5 is a partially cutaway side view showing a waste straw transport device and a rotation angle detection structure.

FIG. 6 is a side view showing a rotation angle detecting structure of a conventional horizontal feed screw conveyor.

[Explanation of symbols]

 11a Rotating member 15 Cam body 18 Position detection sensor Z Rotation axis

Claims (4)

[Claims] A rotary member provided with a cam body having a continuous cam surface around a rotation axis thereof, and a position for continuously detecting a relative position between the cam surface of the cam body and a fixed point. A combine rotating part angle detecting device provided with a detecting sensor. 2. The apparatus according to claim 1, wherein the cam body is configured such that a cam surface continuously changes in a direction of the rotation axis of the rotating member. 3. The combine rotating part angle detecting device according to claim 1 or 2, wherein a suddenly changing portion of the cam surface is provided at a specific position of the cam body around the rotation axis. 4. The abruptly changing portion of the cam surface is set corresponding to a limit position of rotation of the rotating member.
3. The rotating part angle detecting device for a combine according to claim 1.