JPS6254069B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an angle control device for a sorting plate in a swing sorting device.

The sorting plate of the oscillating sorting device has an angle of inclination with respect to the horizontal plane for efficient oscillating sorting, and this gives an appropriate distribution state to the rice to be sorted on the sorting plate. In other words, there is a predetermined ratio between grain layer thicknesses on the upper side and the lower side in the oscillating direction of the sorting plate that enables efficient oscillating sorting, and the sorting plate is A predetermined tilt angle is provided. However, such proper distribution cannot be fixedly determined because it varies depending on the characteristics of the rice to be sorted, such as the dehulling rate or moisture content. That is,
In cases where the dehulling rate of the rice to be sorted is low and/or the moisture content is high, the appropriate distribution is given by making the brown rice side layer thick and the paddy side layer thick. In the opposite case, the layer thickness on the brown rice side is large and the layer thickness on the paddy side is small.

In this way, the appropriate distribution of the rice to be sorted differs depending on its characteristics, so in automatic control of the tilt angle of the oscillating sorting plate, the adaptability can be improved by giving an appropriate distribution according to the characteristics of the rice to be sorted. It is desirable to improve.

The present invention has been made based on the above viewpoints, and
The purpose is to provide an angle control device that can provide an appropriate distribution according to the characteristics of the rice to be sorted and can maintain the above-mentioned appropriate distribution even when the input amount changes.

A feature of the present invention to achieve this object is that it has a pair of layer thickness sensors for detecting the grain layer thicknesses on the upper side and the lower side in the oscillating direction of the oscillating sorting plate. a layer thickness detection means for providing a proportional signal voltage, and amplifying each signal voltage of the detection means to provide approximately equal amplified output at a set grain layer thickness ratio between an upper side and a lower side in a swing direction of the sorting plate. first and second amplifiers that produce an output difference other than a set layer thickness ratio; a variable resistor capable of adjusting an amplification factor of at least one of the amplifiers; and an angle control of the sorting plate according to the output difference between the amplifiers. and controlling the angle of the oscillating sorting plate so that the set grain layer thickness ratio is given by adjusting the variable resistance and the grain layer thickness ratio is maintained. It is located in the angle control device of the oscillating sorting plate.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a swinging sorting device to which an angle control device according to the present invention is applied, which includes a sorting device 11, a swinging mechanism 13 for swinging the sorting device in the upper left and right directions in the drawing, and the swinging mechanism. It has an angle adjustment mechanism 15 that adjusts the inclination angle of the sorting device 11 via 13.

The sorting device 11 has at least one stage of sorting plates 1.
and a pair of layer thickness sensors provided on the sorting plate.
A partition plate 19 that partitions S ₁ , S ₂ and the sorted grain outlet
a, 19b. The layer thickness sensors S ₁ and S ₂ are provided on the upper and lower sides of the sorting plate 1 in the direction of swing, respectively, and measure the layer thickness of brown rice accumulated on the upper side in the direction of swing and the layer thickness of paddy accumulated on the lower side in the direction of swing. Any sensor that can be detected may be used, and either a pressure-sensitive sensor or an optical sensor can be used. In this embodiment, an optical sensor is used, and as shown in FIG.
and lower side wall 1b, respectively.

The swinging mechanism 13 is composed of a pair of bearings 21 (only one bearing is shown) fixed to the machine frame 17, and a pair of channel members whose both ends are connected by connecting rods 23 and 25. A base frame 27 is rotatably supported by a bearing 21 at 23, and a pair of swingers each have one end rotatably supported by each of the connecting rods 23 and 25 and the other end rotatably holding the sorting device 11. Moving arms 29, 31 and connecting rod 23
A swing crank mechanism 32 is provided therein and is provided with a swing crank mechanism 32 that swings the sorting device 11 by a motor drive (not shown). The other end of the base frame 27 is coupled to an angle adjustment mechanism 15, which will be described later, via a connecting rod 25.

As shown in FIG. 2, the angle adjustment mechanism 15 includes a pair of supports 31a fixed to the machine frame 17,
31b, a fulcrum shaft 33 rotatably held horizontally by the support, a pair of working arms 35a, 35b having one end fixed to the fulcrum shaft, and a pair of working arms 35a, 35b each integrally fixed to the other end of each working arm. A pair of connecting arms 37a, 37b whose free ends are rotatably attached to the connecting rod 25, an angle adjustment arm 39 whose one end is fixed to the fulcrum shaft 33, and which engage with the arm 39 to make the arm a fulcrum. It has a motor drive mechanism 41 that controls the inclination angle of the base frame 27 by rotating it around a shaft 33 via operating arms 35a, 35b and connecting arms 37a, 37b. The angle adjustment arm 39 has a clevis-like free end, and a long hole 4 in the longitudinal direction is formed in the clevis.
It has 3. The motor drive mechanism 41 is connected to the machine frame 17
The mechanism 41 has a built-in angle control motor (reference numeral M in FIG. 3), and is configured so that rotational drive is applied to a screw shaft 45 protruding from the mechanism 41 via, for example, a bevel gear. The screw shaft 45 is a short shaft 4 that engages with the long hole 43 of the angle adjustment arm 39.
7, and is configured such that as the screw shaft 45 rotates, the short shaft 47 moves up and down while maintaining engagement with the elongated hole 43. The motor drive mechanism 41
The angle control motor is driven and controlled by the angle control device described below.

FIG. 3 shows an embodiment of the angle control device according to the present invention, in which a layer thickness detection means 3, first and second amplifiers 5a,
5b, a variable resistor VR for adjusting the amplification factor of the first amplifier 5a, and a drive control means 7 for the angle control motor M.

The layer thickness detection means 3 has a pair of optical sensors S ₁ and S ₂ for detecting the grain layer thickness, and first and second detection circuits 51a and 51b connected to each sensor, and detects the shaking of the grain. The changes in the output current of each sensor S ₁ and S ₂ given according to the above are converted into voltage levels, and the instantaneous layer thicknesses of the grains on the paddy side and brown rice side given by the shaking are converted into voltage values V _X , V _Y Output with . Note that one sensor S ₁
It is assumed that S2 detects the layer thickness on the brown rice side, and the other thickness sensor _S2 detects the layer thickness on the paddy side.

The first and second amplifiers 5a, 5b are connected to respective detection circuits 51a, 51b of the layer thickness detection means 3,
Amplification is given to each of the signal voltage V _X (voltage value corresponding to the layer thickness of brown rice) of the first detection circuit 51a and the signal voltage V _Y (corresponding to the layer thickness of paddy) of the second detection circuit 51b.

The first amplifier 5a is a variable resistor VR for adjusting the amplification factor.
The resistor VR is inserted between the output and the (-) input of the first amplifier 5a and connected to the ground potential via another resistor. The amplification factor α of the first amplifier 5a is therefore variable, and the amplification factor β of the second amplifier 5b is fixed. As a result, with variable amplification factor α,
It becomes possible to arbitrarily set the grain layer thickness ratio between the upper side (brown rice side) and the lower side (paddy side) in the shaking direction of the sorting plate. That is, since the layer thickness ratio between the upper side and the lower side is determined by αV _X ≈βV _Y , if α is made variable, V _X and V _Y will change in order to satisfy the above equation. As mentioned above, V _X and V _Y correspond to the brown rice side layer thickness and the paddy side layer thickness, respectively, so α
It can be seen that a new layer thickness ratio must be provided in order to satisfy V _X ≈βV _Y. Therefore, when the amplification factor α is _changed , _αV It is clear that it is configurable. Note that the variable resistor VR for adjusting the amplification factor α can be adjusted on the control panel and is provided for use by the operator.

Angular control of the sorting plate is provided by control means 7.
The means 7 includes a subtraction circuit 53 using differential amplification, first and second comparators 55a and 55b, and first and second drive circuits 57a and 57 that receive the outputs of the respective comparators and provide drive signals for the angle control motor M.
b, and relays R ₁ and R ₂ inserted between each drive circuit and the angle control motor M.

The subtraction circuit 53 receives the output αV _X of the first amplifier 5a as a (-) input, and the second amplifier 5b as a (+) input.
{V ₊ (βV _Y
−αV _X )} is output. Therefore, the first amplifier 5a
It is clear that the subtraction circuit output becomes approximately the reference voltage V with the layer thickness ratio based on the amplification factor α. The output of the subtraction circuit 53 is the (+) of the first comparator 55a.
level voltages V _A and V _B are applied to the other input of each comparator 55 a, 55 b. That is, V A is applied to the (-) input of the first comparator 55a via voltage dividing resistors r ₁ and r ₂ , and V _A is applied to the (+) input of the second comparator 55 b via r ₃ and r ₄ . _B is given. The relationship between the reference voltage V and each level voltage V _A and V _B is shown in FIG. As is clear from the figure, V _A and V _B satisfy V _B < V < V _A with respect to the reference voltage V, preferably V is an intermediate potential, and the distance between V _A and V _B is, for example, 1 (V ) is given. This area between V _A and V _B forms a dead area for the drive circuits 57a and 57b, and prevents any inconvenience caused by the constant operation of the first or second drive circuit. Level potentials above V _A and below V _B indicate the operating range of each comparator 55a, 55b,
The first comparator 55a operates when the amplified output relationship is αV _X <βV _Y , and the second comparator 55b operates when αV _X >βV _Y.

In the angle control device configured as above, when an appropriate amplification factor α is given to the first amplifier 5a by the variable resistor VR, each amplifier 5
Since the subtraction circuit 53 gives an output {V+(βV _{Y −αV}
b works. As a result, the angle of the sorting plate is controlled by the angle control motor M until αV _X ≈βV _Y is satisfied, that is, until a new layer thickness ratio is obtained.

The amplification factor α is determined to give an appropriate distribution according to the characteristics of the rice to be sorted. If the appropriate distribution is known, it is desirable to attach a scale to the slide of the variable resistor VR to give the corresponding amplification factor, and if it is unknown, the most appropriate amplification factor can be given by varying the VR. Just adjust it to .

Once the amplification factor that provides an appropriate distribution is determined as described above, the angle of the sorting plate is controlled so that the layer thickness ratio corresponding to the amplification factor is maintained even when the input amount of rice to be sorted changes.

FIG. 5 is an explanatory diagram of angle control with respect to fluctuations in the amount of grain input, assuming that the appropriate distribution of rice to be sorted is given by the inclination angle θ of the sorting plate 1 with respect to the horizontal plane. The solid line S in the figure indicates the appropriate distribution of rice to be sorted at the inclination angle θ, and the layer thickness on the brown rice side at this time is a,
The paddy side layer thickness shall be given by A, respectively. In the figure, if the input amount of rice to be sorted fluctuates and this proper distribution is disturbed and αV _X ≠ βV _Y , then A/a=A′/
_{αV _}

That is, in Fig. 3, if the set layer thickness ratio between the brown rice side and the paddy side is disrupted due to fluctuations in the amount of input, and for example, the layer thickness on the paddy side becomes larger than the layer thickness on the brown rice side, the first and second amplifiers The output signals of 5a and 5b are αV _X <β
V _Y , and the output of the subtraction circuit 53 becomes higher than the reference voltage V. When this fluctuation exceeds V _A , the first comparator 55a gives an output, so the angle control motor M is rotationally driven via the first drive circuit 57a and relay _R1 until αV _X ≒ βV _Y is satisfied. The angle of inclination of the sorting plate is reduced. When the output _of each amplifier 5a, 5b becomes _αV
An inclination angle that satisfies the set layer thickness ratio based on the amplification factor α is given. Contrary to the above, if the layer thickness on the brown rice side is large (αV _X > βV _Y ), the second comparator 5
It is clear that the inclination angle of the sorting plate is increased according to the output of 5b.

In the above embodiment, the amplification factor of the first amplifier is made variable, but it is of course possible to make the amplification factor of the second amplifier variable, and the same effect can be achieved.

As is clear from the embodiments described above, according to the present invention, the grain layer thickness ratio between the upper side and the lower side in the swinging direction of the sorting plate can be arbitrarily set by using the variable resistance. We provide an angle control device that makes it possible to easily give an appropriate distribution according to the characteristics of the rice to be sorted, maintains the above set layer thickness ratio even when the amount of grain input changes, and provides efficient rocking sorting. can do.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of a swing sorting device equipped with an angle control device according to the present invention, FIG. 2 is a perspective view showing the angle control mechanism shown in FIG. 1, and FIG. 3 is an example of an angle control device according to the present invention. Embodiment FIGS. 4 and 5 are explanatory views of the operation of the angle control device according to the present invention. 1... Oscillating sorting plate, 3... Layer thickness detection means, 5
a, 5b...Amplifier, 7...Control means, VR...
Variable resistor, S ₁ , S ₂ ... layer thickness sensor, M ... angle control motor.

Claims (1)

[Claims] 1. A layer thickness detection means having a pair of layer thickness sensors for detecting the thickness of each grain layer on the upper side and the lower side in the oscillating direction of the oscillating sorting plate, and providing a signal voltage proportional to each grain layer thickness; a first amplifying signal voltage of the detection means to give approximately equal amplified output at a set grain layer thickness ratio between the upper side and the lower side in the swinging direction of the sorting plate, and to produce an output difference at a ratio other than the set layer thickness ratio; and a second amplifier, a variable resistor capable of adjusting the amplification factor of at least one of the amplifiers, and control means for controlling the angle of the sorting plate according to the output difference between the amplifiers, An angle control device for an oscillating sorting plate, characterized in that the angle of the oscillating sorting plate is controlled so as to provide the set grain layer thickness ratio through adjustment and maintain the grain layer thickness ratio.