JPH0252076A - Sorting apparatus - Google Patents

Abstract

PURPOSE:To properly control the flow rate on a sorting net by calculating the flow rate of grain on the sorting net on the basis of the detection of grain due to a grain detection means composed of a piezoelectric element and controlling an inclination altering means on the basis of the calculated data. CONSTITUTION:Grain 2 is allowed to flow down on a sorting net 6 supported in an angle-of-inclination controllable manner to be sorted. A grain detection means 10 composed of a piezoelectric element arranged so as to face to the sorting net 6 and an inclination altering means 9 for altering the angle-of- inclination of the sorting net 6 are provided. A flow rate control means 17 calculates the flow rate of the grain on the sorting net 6 on the basis of the detection of grain due to the grain detection means 10 to control the inclination altering means 9 on the basis of the calculated data. As a result, the flow rate of the grain flowing down on the sorting net becomes always proper.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a sorting device, particularly a sorting device that sorts grains from unweighed grains to unweighed grains, and more specifically, to a sorting device that supports grains in an adjustable inclination angle. The present invention relates to a sorting device that carries out sorting by flowing down on a sorting net.

(b) Conventional technology In general, a sorting device has an upper screen and middle/lower screens arranged at an angle, and above the upper screen in the direction of the slope, grains that have passed through the unweighing process of the huller are placed. A shaker funnel is installed to collect the grains, and the grains fall from the scaler funnel and flow down onto the upper screen, and brown rice with relatively large grains, including unhulled rice, is passed through the upper screen without leaking through the upper screen. The sample is then subjected to the deweighing process again.
In addition, the particles, which are relatively small in size and leak from the upper screen to the middle and lower screens, are collected as finished rice. However, according to this, when grains flow down the upper mesh, the flow of grains is fast in the temperature range upstream of the upper mesh, and slows down in the downstream temperature range, resulting in a stagnation state, which affects the entire temperature range. hand,
This results in a problem that the sorting action by the upper screen is not performed properly.

Therefore, as shown in Japanese Utility Model Publication No. 63-14934, a grain flow sensor that contacts the grains flowing down and detects the flow velocity is installed so as to face the upper screen, and the grain flow is An upper mesh movement adjustment device has been devised that is configured to appropriately adjust the stagnation state by appropriately changing the inclination angle of the upper mesh using an automatic control device based on the falling velocity of grains detected by a sensor. There is.

(C) Problems to be Solved by the Invention By the way, the above-mentioned conventional top screen automatic adjustment device uses a rotary grain flow sensor to detect the speed of grains flowing down on the top screen. For example, as shown in FIG. 10(a), even when the grains 2... flow down on the upper mesh 1 in a relatively dense manner, as shown in FIG. 10(b), the grains 2... Even if ・flows down in a relatively coarse state, the density of the grains is actually different and the flow rate is different.
Since all grain flow sensors can only detect the same speed, it becomes difficult to properly adjust the flow rate on the upper screen.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a sorting device configured to accurately detect the flow rate of grains based on the detection of grain detection means consisting of a piezo element, thereby solving the above-mentioned problems. It is.

(:) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, as shown in FIG. 1, the inclination angle of the grains (2...) can be adjusted. In a sorting device (5) that sorts grains by flowing down over a sorting net (6) supported by a grain detector, a grain detecting means (10) comprising a piezo element (19) arranged so as to face the sorting net (6); an inclination changing means (9) for changing the inclination angle of the sorting 1it (6); and the grain detecting means (10).
The grains (2) on the sorting net (6) are
...) and a flow rate control means (17) for controlling the slope changing means (9) based on the calculated data.

(E) Effect Based on the above-mentioned configuration, when the grains (2...) after hulling are flowed down on the inclined sorting net (6), the grains (2...)
) comes into contact with the grain detection means (10), and a pulse signal is input to the flow rate control means (17). Based on this, the flow rate of the grains is calculated by the flow rate control means (17), and based on the calculated data, the slope changing means (9) is adjusted so that the flow rate of the grains (2...) is appropriate. activated.

Note that the symbols in parentheses do not limit the configuration in any way.

B) Examples Examples according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the sorting device 5 is installed such that an upper screen 6 can freely rotate in the direction of the arrow in FIG. 9, the angle can be freely changed.

Also, a grain detection sensor 10 is provided facing approximately the center of the upper screen 6.
is installed, and a weighing funnel 12 having a gate valve 11 is installed facing the upstream portion of the upper screen 6. The grain detection sensor 10 is connected to a microcomputer 16 (hereinafter referred to as microcomputer) via an amplifier 13 and a waveform converter 15, and an adjustment motor 9 is connected to the output side of the microcomputer 16. There is. Further, the microcomputer 16 is provided with a flow rate control means 17, and the flow rate control means 17 controls the flow rate of the grains 2 on the upper mesh 6 based on the input of the grain detection signal from the grain detection sensor 10. is calculated, and a control signal is output to the adjustment motor 9 based on the calculated data, thereby adjusting the inclination angle of the upper mesh 6 to the grain 2.
Adjust the flow rate so that it is always appropriate.

As shown in FIG. 2, the grain detection sensor 10 has a tongue-shaped piezo element 19 projecting below the support part 17, and one end of the piezo element 19 − different electric f! il! 20° 20 are connected, and the other end of the slave piezo element 19 comes into contact with the grain 2..., swings in the direction of the arrow in FIG. 2(b), the pulse signal whose frequency is proportional to the swing frequency of the piezo element 19 and whose amplitude is proportional to the swing width of the piezo element 19 is configured to be output. There is.

In addition, as shown in FIG. 3(a), when the grains 2... flow down with a relatively narrow interval, they are detected as a pulse signal indicated by B in the figure, and as shown in FIG. As shown in b), when the grains 2... flow down with relatively wide intervals, they are detected as a pulse signal shown in C in the figure. Furthermore, for example, as shown at 10' in the figure, there is a location other than the grain detection sensor 10 on the downstream side of the upper net 6, that is, the upper net 6.
If a grain detection sensor is installed near the temperature range downstream of By using the stagnation detection data in the downstream temperature range together with the flow rate detection data, it is also possible to make the balance between the flow rate and stagnation appropriate. Note that E, F, and G shown in FIG. 4 indicate cases where no grain is detected, the case where the grain flow density is small, and the case where the grain flow density is large, respectively.

Since this embodiment has the above configuration, the hopper 1
When the hulled grains are released from 2 and flowed down on the upper net 6, the piezo element 19 of the grain detection sensor 10 is swung in the direction of the arrow in FIG. A pulse signal as shown in Figure (b) is input to the flow rate control means 17 via the amplifier 13 and the waveform converter 15 (Sl), and then the flow rate control means 17 calculates the number of pulses per unit time. 32), and the time interval between the previous input pulse and the current input pulse is the set time T.
, it is determined whether or not the above is true (S3). As a result, if the time interval is within the set time T1, automatic ON processing is performed (S4), and the set pulse number S and the detected pulse number a are compared (S5). As a result, if the set pulse number S<the detected pulse number a, the adjustment motor 9 is controlled so that the inclination angle of the upper body 6 becomes smaller (S6). Further, if the set pulse number S>the detected pulse number a, the adjustment motor 9 is controlled so that the inclination angle of the upper screen 6 becomes larger (S7). Further, when the set pulse number 54 is the detected pulse number a, the adjustment motor 9 is stopped in order to maintain the current inclination angle of the upper screen 6. On the other hand, if it is determined in S3 that the time interval between the previous input pulse and the current input pulse is equal to or longer than the set time T1, the automatic processing is turned off (S9).

Therefore, since the automatic control is turned on and off based on the pulse signal at the time of grain ri2... detection, there is no need for a detection switch or the like, and the structure of the device is simplified.

Note that, as in the grain detection sensor 21 shown in FIGS. 6(a) and 6(b), the piezo element 19 is held between protective members 22, 22 such as rubber or acrylic plates, and the piezo element 19 is prevented from being worn out by the paddy. Alternatively, as in the grain detection sensor 23 shown in FIGS. 7(a) and 7(b), a rigid plate made of resin or the like may be provided at the tip of the piezo element 19. 25 is fixed, and the plate 25 is attached to the grain 2...
The structure may be such that wear of the piezo element 19 is prevented by direct contact with the piezo element 19, and the deflection of the piezo element 19 is improved compared to a case where a protective member is attached to the entire piezo element 19.

Furthermore, as shown in FIG. 8, the grain detection sensor 2 of FIG.
In addition to the structure of 3, rigid plates (27 and 29) smaller in size than the plate 25 are pasted above the rigid plate 25 at a predetermined interval, and grain 2... The bends in the engineering section are J, L and J in Figure 8.
The piezo element 19 may be bent in a dispersed manner, such that the bending stress is not concentrated in one place, and the durability of the piezo element 19 to the grains 2 is further increased.

Further, as shown in FIG. 9, a flow velocity rotation detection sensor 30 is arranged on the upper screen 6 together with the grain detection sensor 1o, and the grain detection sensor 10 detects the flow rate of the grains 2... The flow rate of the grains 2 is detected by the flow rate rotation detection sensor 30, and the inclination angle of the upper screen 6 and the control of the gate valve 11 of the weighing funnel 12 are controlled based on the flow rate detection data and the flow rate detection data. It may be configured to be more accurate.

(G) As described in detail, according to the present invention, the piezo element (19
), the flow rate of grains on the sorting net (6) is calculated based on the grain detection by the grain detection means (10), and the slope changing means (9) is controlled based on the calculated data. Therefore, the grains (2...) can be directly pulse-detected to accurately detect the flow rate, and based on the flow rate detection data, the grains (2...) flowing down on the sorting network (6) can be detected accurately. ...
) can be adjusted so that the flow rate of the grains (2...) on the sorting net (6) can be adjusted depending on the installation method of the grain detection means (10). stagnation can also be detected, and by adding the stagnation detection data to the flow rate detection data, the slope control of the sorting net (6) can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the system configuration of the sorting device according to the present invention, Fig. 2 (a) is an enlarged perspective view showing the grain detection sensor, and Fig. 2 (b) is the pulse signal at the time of grain detection. Figure 3 shows the grain detection pulse etc. detected by the grain detection sensor, and (a) shows when the grain flow density is dense, (bl
4 is a diagram showing various pulse waveforms detected by the grain detection sensor, and FIG. 5 is a diagram showing a flowchart showing the operation of this embodiment. Furthermore, Fig. 6 shows a grain detection sensor in which the piezo element is protected by a protective member, (a) is a side view thereof, (b) is a front view thereof, and Fig. 7 is a grain detection sensor with a rigid plate attached to the tip of the piezo element. 8 shows a grain detection sensor, in which (a) is a side view thereof, (b) is a front view thereof, and FIG. 8 shows a grain detection sensor with a tip of a piezo element and a rigid plate attached at a predetermined interval from the tip; (Al is a side view thereof, (b) is a front view thereof, FIG. 9 is a diagram showing another embodiment in which a flow velocity detection sensor is provided together with a grain detection sensor. And, FIG. 10 is a diagram showing a flow velocity detection sensor. The flow velocity of grains is detected by using (a
) is a diagram showing a case where the flow density is dense, and (b) is a diagram showing a case where the flow density is coarse. 2... Grain, 5... Sorting device, 6...
Sorting net (upper m) 9...Inclination changing means (adjustment motor), 10... Grain detection means (grain detection sensor), 17... Flow rate control means, 19
...piezo element

Claims (1)

[Scope of Claims] 1. A sorting device that sorts grains by flowing them down a sorting net that is supported so as to be able to adjust its inclination angle; , an inclination changing means for changing the inclination angle of the sorting net, and calculating a flow rate of grains on the sorting net based on grain detection by the grain detecting means, and controlling the inclination changing means based on the calculated data. A sorting device characterized by comprising: a flow rate control means for controlling the flow rate;