JPH0432713A - Position detector - Google Patents

Abstract

PURPOSE:To accurately detect a shift in the position of the external surface part of an object to be detected without any electric correction by changing plural kinds of combination of pieces of detection information of plural detection parts as a disk rotate. CONSTITUTION:A sensor which detects the position of the top surface of a straw layer is provided to arch metal 20 fixed to a receiving net 5. The sensor S consists of a contactor 21 which is provided while enabled to swing freely in the conveying direction of a processed body, a disk 22 which turns integrally around the same axis P with the contactor 21, and four optical pickup devices 24a - 24d which read whether or not slits 23a - 23d formed in the disk 22 are present or not from transmitted light, and connected to a controller H through four signal lines L1 - L4 connected to the devices 24a - 24d. Then the slits 23a - 23d change plural kinds of combination of pieces detection information of the devices 24a - 24d as the disk 22 rotates and the length in circumferential directions where plural kinds of combination appear is so set that the combinations change every time the position shift increases or decreases by a set quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a method of detecting a contact member by a swinging displacement of a swinging contact member that is returned to the outer surface side of an object to be detected. It is connected to a position detection device that detects a change in the position of the outer surface of the object to be detected with respect to the swing axis.

[Prior Art] As shown in FIG. 7, such a position detecting device has a potentiometer (26) connected to the swing shaft of a contact body (21) called a sensor, and swings the contact body (21). There is generally known a configuration in which the resistance value of a potentiometer (2G) changes with movement. In this position detection device, a change in resistance value is determined as a change in voltage value, and based on this, a change in position of the outer surface of the object to be detected is detected.

Although the resistance value of the potentiometer (26) changes linearly with the swing angle of the contact body (21) and has a linear proportional relationship, the swing angle of the contact body (21) It changes non-linearly with respect to changes in the position of and does not have a linear proportional relationship. In other words, as shown in Figure 3, the closer the outer surface of the object to be detected is to the axis of the oscillator, the smaller the amount of change in the swing angle with respect to the change in the position of the outer surface of the object to be detected. . Therefore, when trying to accurately detect changes in the position of the outer surface of the object to be detected, it is necessary to
), so that there is a linear proportional relationship between the swing angle of the sensor and the change in the position of the outer surface of the object to be detected. It won't happen.

[Problem to be solved by the invention]

Electric circuits that correct non-linear relationships to linear relationships require complex calculations to determine the electronic elements to assemble, and even after completion, delicate adjustments must be made depending on the usage environment. I need. - Boat fishing requires time and skill to assemble, and costs tend to be high.

The present invention has been made in view of the above circumstances, and its purpose is to enable accurate detection of changes in the position of the outer surface of an object to be detected without electrical correction. be.

[Means to solve the problem]

The position detection device according to the present invention includes a rotating body that rotates in conjunction with the swinging of the contact body, and a rotating body that is provided intermittently along the circumferential direction around the rotation axis of the rotating body. A plurality of rows of detected parts and a plurality of detection parts on a fixed side that individually detect the presence or absence of each of the plurality of rows of detected parts are provided, and the plurality of rows of detected parts are connected to the plurality of detected parts. The combination of detection information of the detection unit is changed into a plurality of different types as the rotating body rotates, and the length along the circumferential direction at which the combination appears in each of the combinations of the plurality of types is determined at the position. The characteristic configuration is that the length is set to produce a change in the combination each time the change increases or decreases by a set amount.

[For production]

When the outer surface of the object to be detected changes its position with respect to the swing axis of the contact body, the contact body, which is biased to return to the outer surface of the object to be detected, swings as the position changes. The rotating body rotates in conjunction with the motion. When the rotating body rotates, the detected part is intermittently provided along the circumferential direction around the rotating axis of the rotating body, so the fixed position of the detected part (
The presence or absence of the pull changes in multiple ways as the rotating body rotates.

The plurality of detecting sections provided on the fixed side individually detect the presence or absence of the plurality of rows of detected sections. Since the presence or absence changes with the rotation of the rotating body, the combinations of detection information from the plurality of detection units also change into a plurality of different types. Since there are multiple types of detection information and the contents are in two states, presence or absence, the combination of detection information corresponds to a binary code signal. In other words, when the rotating body rotates, binary code signals corresponding to the rotation angle are outputted in parallel from the plurality of detection units. Therefore, the rotation angle of the rotating body is detected by decoding the code signal.

By the way, as mentioned earlier, the swing angle of the contact body and the rotation angle of the rotating body do not have a linear proportional relationship with respect to the change in the position of the outer surface, and simply decoding the coat signal does not determine the detection target. It is not possible to detect changes in the position of the outer surface of an object.

However, the range in which different combinations of detection information appear with respect to the rotation angle of the rotating body is proportional to the circumferential length of the detected part. By making the length so that the combination changes every time the change increases or decreases by a set amount, it is possible to detect a change in the position of the outer surface of the object to be detected by simply interpreting the coat signal as it is. .

Incidentally, the code signal can be easily decoded by program processing in a microcomputer.

(Effects of the Invention) In order to accurately detect a change in the position of the outer surface of the object to be detected, an electric circuit for correcting the detection information of the detection unit is no longer required. It becomes possible to reduce costs.

[Example] Hereinafter, an example in which the present invention is applied to a threshing device mounted on a combine harvester will be described based on the drawings.

As shown in Figure 6, the threshing device consists of a feed chain (
The handling cylinder (2) handles and processes the cut husk culms that are pinched and conveyed in (1).
), a swinging sorting plate (3) that acts to sort out the waste leaked from the handling room (8), and a winnow (4) that blows sorting air. It consists of a sorting device (B).

In the lower part of the handling chamber (A), a receiving net (5) for leaking threshed material is provided along the lower outer periphery of the handling barrel (2),
Then, at the rear side of the receiving net (5), the handling room (A
) An opening (6) for discharging the threshed material remaining in the
is formed.

The swing sorting plate (3) includes a grain pan (7), a chaff sieve (8), and a stroke rack (9), which are arranged sequentially from the front to the rear, and the chaff sieve (8). ) is located below the auxiliary grain pan (1
0) and grain sheaves (11) are arranged in a sequential manner in the front-rear direction, and each part thereof is fixed between a pair of left and right side plates (12), and the whole is formed into a plate shape.

Further, in the lower part of the sorting device (B), there is a first grain collecting section (13) for collecting grains leaking from the grain sieve (11) as the first grain, and a terminal end of the straw rack (9). The treated material (hereinafter referred to as "second material" in the following explanation) that has fallen beyond the end of the grain sieve (11) and is mixed with grains is collected and placed in the handling room (8). A second product recovery section (14) for return is provided. In the figure, (15) is a second thrower for reprocessing the second material and returning it to the handling chamber (8).

To explain the chaff sieve ()), as shown in FIG. 5, a plurality of band plate-like members (8a) arranged in parallel in the processing material transfer direction (left-right direction in FIG. 5) are arranged at their upper ends. The operation "door 1" (16), which is rotatably attached to the left and right side plates (8b) using the part as a fulcrum, and which is pivoted to the lower end of each strip member (8a), is pushed in the front-rear direction. By pulling the strip plate-shaped portion +4 (8a
) (in the following explanation, it may be abbreviated as chaff opening degree) can be changed and adjusted.

A swing arm (17a) is provided with an electric motor (M) for interval adjustment that changes and adjusts the chaff opening degree, and is connected to the electric motor (M) via a gear-type linkage mechanism (17). And said operation! 1 (.(16)) is connected to the release wire (18) in a -ζ interlocking manner. In the figure, (19) is a spring that biases the chaff opening degree back to the closing side, and (PM) is a spring that biases the chaff opening degree back to the closing side. This is a chaff opening detection potentiometer that detects the operation amount of the operating rod (16) by the electric motor (M) as the chaff opening, and is attached to the pivot portion of the swing arm (17a).

Then, the chaff opening degree is controlled so that the detected angle of the potentiometer (1) and the target angle become equal to each other by driving the electric motor (old) so that the gap becomes the target angle.

To explain the configuration for detecting the thickness of the shell culm layer, as shown in FIG. A sensor (S) is provided. As shown in Fig. 1, this sensor (S) is a contactor (21) (corresponding to a contact body) provided movably in the direction of transfer of the processed material (direction of the axis of the handling cylinder). And, the same axis as this contact (21) (
A disc (22) (corresponding to a rotating body) rotates integrally around the disc (22B) and a slit (22) formed around the disc (22B).
3a) - (23d) Four optical big amplifier devices (corresponding to the detected part) that sell S from transparent 14 light to determine the presence or absence of (corresponding to the detected part)
Consisting of 24a) to (24d) (corresponding to the detection section),
Each optical big amplifier device (24a) to (24d) is connected to a control device (1()) shown in FIG. 2 via four signal lines (L, to L4).

The contactor (21) is elastically biased downward so that as the thickness of the shell culm layer increases, it swings in the direction of transfer of the material while contacting the upper surface of the shell culm layer.

The slits (23a) to (23d) are arranged in the circular plate (22
) are formed circumferentially around the axis of the slit h (23a
), second slit (23b), third slit (23c)
, the fourth slit (23d). On the other hand, the optical big amplifier devices (24a) to (24d) are arranged in a series corresponding to the diameters of the sulins h (23a) to (23d), and the first one is placed in order from the one furthest from the center. Optical pick-up device (24a), second pick-up device (
24b), a third pickup device (24c), and a fourth pickup device (24d). When the circle +ff (22) rotates, the first slit (23a)
is detected by the first optical pickup device (24a), and the second slit (23b) is detected by the second optical pickup device (24a).
24b), and the third slit 1 to (23c)
is detected by the third optical pickup device (24c), and the fourth slit (23d) is detected by the fourth optical pickup device (24c).
24d).

The optical pickup devices (24a) to (24d) send an ON signal when the slits (23a) to (23d) are being detected, and an OFF signal when they are not detected, to the respective signal lines (L, to L4). ) is output to the control device (11) as a 4-bit code signal. This O
The content of the code signal, which is a combination of N and OFF signals, changes depending on the presence or absence of each slit (23a) to (23d), so the range (90
Each slit (23 degrees) is divided into 16 areas, and each slit (23
a) to (23d) are formed. In addition, a disc (22
) rotates to change the content of the code signal depends on the circumferential length of the slits (23a) to (23d). The division is performed in such a way that the larger the rotation angle, the narrower the division range. In other words, as long as the rotation angle of the disk (22) is small, the content of the coat signal is difficult to change;
Furthermore, as the rotation angle of the disk (22) increases, the contents of the code signal tend to change.

The reason why the division is not made equal as mentioned above is because the rate at which the thickness of the culm layer changes and the rate at which the contact (21) swings do not have a linear proportional relationship, as shown in Figure 3. In addition, even if there is a predetermined amount of 1 on the upper surface of the culm layer, the contact (
21) because the swing angle gradually becomes smaller.

In other words, by making the fraction 11J non-uniform, the content of the code signal changes as the -1-plane of the culm layer rises by a predetermined amount.

Furthermore, if the height of the upper surface of the culm layer is the length of the H1 contact (21) is L, and the swing angle of the contact (21) from the vertical direction is θ, then H = L (1-COSθ) The formula holds true.

The correspondence relationship between the height of the upper surface of the culm layer and the code signal is as shown in FIG. There is almost no culm layer and the top surface is high. If it is within the range, the code signal is sent to the control device (11):
0000 is output.

If a small amount of the culm layer is present and the height of the upper surface is within the range h, a coat signal: 0001 is output.

In this way, when the height of the upper surface of the culm layer changes from ho to lll5, the content of the code signal also changes from 0000 to 1111.
It will change step by step.

By the way, as the oscillating sorting plate (3) is driven to oscillate, the Rlli%i between the oscillating sorting plate (3) and the sensor (S) changes, so the contactor (21) also oscillates. Then,
As a result, the code signals outputted through the four signal lines O,+) to (L4) also fluctuate in synchronization with the t:1: dynamic drive of the swinging selection plate (3). Control there! Place A (11) reads these code signals to determine the height of the two surfaces, sequentially captures only the maximum value, and calculates the thickness of the layer to be processed using this maximum value as a reference.

In addition to the sensor (S), the control device (II) is connected to the drive circuit (25) of the electric motor (M) and the body density meter (PM), and the sensor (S) and the potentiometer (PM) Based on the information of the drive circuit (2
5), a control signal of 0 is output to the electric motor (gate), and the sorting state of the sorting device (B) is automatically adjusted.

Basically, when the layer of the processed material in the chaff sieve (8)-L becomes thicker, the electric motor (M) with the larger chaff opening is driven to increase the leakage amount of the processed material. Further, when the layer of the material to be treated becomes thin, the electric motor (M) is driven so that the chaff opening degree becomes small, thereby reducing the amount of leakage of the material to be treated. In this way, the layer of the material to be processed is maintained at a constant thickness, allowing for highly efficient sorting.

[Another embodiment] (a) In the previous embodiment, the contactor (21) and the disc (22
) have the same axis, but the axis of the contactor (21) and the disc (2
The shafts of 2) may be separated and connected together by gears, gears, etc. At this time, if the rotation of the shaft of the contactor (21) is transmitted at a reduced speed to the shaft of the disc (22), detection accuracy can be improved.

(+)) 4 types of slits (23a) to (23b)
The configuration is such that it is detected by four optical pickup devices (24a) to (24d) and output in 4 bits, but it is also configured to output in 2 vias 1, 3 bits, or 5 bits or more - 1. You can.

(C) If the outputs from the optical pickup devices (24a) to (24d) are continuous thick binary numbers, then Δ/D
It is also possible to convert the voltage value and input the converted voltage value into the control device (original).

(d) Slit the detected part (23a) to (23+
1), and the detection unit is an optical pick amplifier device (24a) to (
24d), the detected portion and the detection portion may be configured with electrical contacts.

(e) The shape of the rotating body does not have to be circular. It may be fan-shaped or triangular. In short, it is sufficient as long as there is enough space for the detected portion to exist.

(f) This position detection device can be applied for various purposes other than detecting the thickness of the culm layer. For example, it may be used to detect changes in the position of the surface of an individual or to detect changes in the height of the surface of a liquid.

Incidentally, although reference numerals are written in the claims section for convenience of comparison with FIG.

[Brief explanation of the drawing]

The drawings show an embodiment of the "!"=--' 411 detection device according to the present invention, and FIG. 1 is an enlarged view and FIG. 2 is an enlarged view.
The figure is a block diagram of the control configuration, and Figure 3 shows the position of the upper surface of the culm layer and the position of the contactor. Figure 4 is a graph showing the correspondence between the swing position of the contact and the yaw 1 signal.
FIG. 5 is an explanatory diagram of the chaff opening adjustment mechanism, and FIG. 6 is a schematic cut-away side view of the threshing device. FIG. 7 is an enlarged view of the main parts in the conventional example. (P)...Rotating axis, (21)...Contact body, (22)...Rotating body, (23a)-(2
3d)...Detected part, (24a) to (24d)
······Detection unit.

Claims (1)

[Scope of Claims] By the rocking displacement of the rocking type contact body (21) which is biased to return to the outer surface side of the object to be detected, the said contact body (21) is rotated with respect to the rocking axis (P). A position detection device that detects a change in the position of an outer surface of a detection target, comprising a rotating body (
22) and a detected portion (23a
) to (23d) and the detected parts (2
A plurality of detection sections (24a) to (24d) on the fixed side are provided to separately detect the presence or absence of each of 3a) to (23d), and the plurality of rows of detected sections (23a) to (23d) are ,
The combination of detection information of the plurality of detection units (24a) to (24d) is changed into a plurality of different types as the rotating body (22) rotates, and the combination is changed in each of the combinations of the plurality of types. A position detection device configured by setting a length along a circumferential direction of the appearance to a length that causes a change in the combination each time the position change increases or decreases by a set amount.