JPS6330072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a dust prevention device for a grain color sorter.

In the photoelectric sorting room, different colored particles are detected by an optical detection chamber equipped with a light source, a light receiving element, a reference color plate, etc., and the detection signal activates a spray nozzle device to sort the colors. Particles may collide with the light window/receiver window or its dust-proof translucent wall, or scattered dust may adhere to the wall and cause fogging, reducing the amount of light emitted and affecting the detection sensitivity of the light-receiving element. , which have defects such as malfunctions in injection sorting.

In order to solve the above-mentioned drawbacks, the present invention creates an air curtain that passes closely in parallel along the outer surface of the light-transmitting wall of the light projecting window of the light source of the optical detection chamber or the light receiving window of the light receiving element lens. The purpose of the present invention is to develop and provide a device for constantly keeping the light-transmitting wall surface provided in an optical detection chamber clean and ensuring highly accurate color sorting.

Embodiments of the present invention will be described with reference to illustrative figures.
In Figures 1 and 2, code 1 is the sorting machine frame;
A vibrating grain feeder 3 with a vibrating device 2 on the top of the machine frame 1
A feeding hopper 4 is installed on the supply side, and a descending gutter 5 is installed on the discharge side to form a grain feeding process. A pair of optical detection chambers 9, 9 consisting of a light source 6, a light receiving element 7, and a reference color plate 8, and an injection nozzle 10 device that operates in communication with the light receiving element 7 are provided around the flow trajectory A flowing down. A photoelectric sorting chamber 11 is provided, and the light receiving element 7 and the injection nozzle 10
The device is electrically connected to the device via a control circuit C, and an outlet 1 for different color particles is provided at the bottom of the photoelectric sorting chamber 11.
2 is provided, and a grain collecting barrel 13 for grain size adjustment is inserted and inserted on an extension of the flow path A to collect the grain size and take it out of the machine.

The photoelectric sorting chamber 11 has a flow trajectory A in the upper part of the chamber.
A pair of optical detection chambers 9, 9 are provided facing each other, with the front surface of each detection chamber 9 containing a light source 6, a light receiving element 7, and a reference color plate inside a box 15 with a light-transmitting wall 14. A grain scattering prevention wall 16 is provided between each of the optical detection chambers 9, 9 and the injection nozzle 10 device, and the upper space is used as the optical sorting section 17, and the lower space is used as the optical sorting section 17. is the grain sorting section 18, and an exhaust fan 19 is installed outside the side wall of the grain sorting section 18 at the bottom of the photoelectric sorting chamber 11 to remove indoor air. To generate an air curtain B that passes closely in parallel along the outer surface of the light-transmitting walls 14, 14 of the light projection window of the light source 6 or the light reception window of the light receiving element 7 lens provided in a space that goes straight in a diagonally downward direction. A slit-shaped wind blows into both walls provided at the upper and lower parts of the perforated walls 14, 14 of the optical detection chambers 9, 9, that is, the upper wall 20 of the photoelectric sorting chamber 11 and the grain scattering prevention wall 16. Inlets 21, 21 and outlets 22, 22 are provided symmetrically, and a wind inlet 2 is provided in the upper wall 20.
1 and 21 are connected to blowers 23 and 23, respectively, and an air outlet 2 provided on the prevention wall 16
Reference numerals 2 and 22 are connected to the exhaust fan 19 via the grain sorting section 18 in the lower space, and 24 is an air path bending plate provided in the grain sorting section.

With the above-mentioned configuration, the particles mixed with different colors of the raw material flowing down from the supply hopper 4 to the vibrating grain feeding gutter 3 flow down to the lower flow gutter 5 due to the vibration action of the grain feeding gutter 3, and the particles flow inside the gutter. It slides and flows out in the photoelectric sorting chamber 11 in a diagonal downward direction along a flow trajectory A. In the photoelectric sorting chamber 11, the light beam emitted from the light source 6 of the optical detection chamber 9 irradiates the grain flux of the falling trajectory A, and the light-receiving element 7 receives the transmitted or reflected light beam of the grain, respectively. The light beam and the reflected light beam of the reference color plate 8 are compared to detect the difference in light intensity, and the detection signal is sent to the control circuit C to operate the injection nozzle 10, and the different color particles are moved from the falling trajectory A by the jet action. They are separated and selected. In this sorting process, as described above, particles or dust flying around the light-transmitting wall 14 of the optical detection chamber 9 contaminate the surface and affect the amount of light and detection sensitivity. By the rotation of the blower 23 and exhaust fan 19 provided, both wall bodies 20 provided at the upper and lower parts of the transparent wall 14
In contrast to 16, an air curtain is generated that passes closely parallel to the outer surface of the transparent wall 14 from the air inlet 21 provided in the form of a slit toward the outlet 22. In addition to completely preventing dust from entering, it also continuously cleans the transparent wall surface, so there is no reduction in the light intensity or detection sensitivity of each light beam of the light source, light receiving element, and reference color plate, and the normal condition is maintained. The photoelectric effect is always maintained, resulting in remarkable effects such as ensuring highly accurate color sorting.

[Brief explanation of drawings]

The drawings are illustrations of embodiments of the present invention. FIG. 1 is a side sectional view of the color sorter, and FIG. 2 is a sectional view of its photoelectric sorting chamber. 1... Sorting machine frame, 2... Vibrating device, 3... Vibrating grain feeder, 4... Supply hopper, 5... Downflow gutter, 6... Light source,
7... Light receiving element, 8... Reference color plate, 9... Optical detection chamber,
DESCRIPTION OF SYMBOLS 10... Injection nozzle, 11... Photoelectric sorting chamber, 12... Discharge port for different colored grains, 13... Grain collection tube for grain size adjustment, 14... Transparent wall, 15... Box body, 16... Grain scattering prevention wall, 17
...optical sorting section, 18...grain sorting section, 19...exhaust fan, 20...upper wall, 21...inlet, 22...outlet,
23...Blower, 24...Air path refraction plate, A...Flow trajectory, B...Air curtain, C...Control circuit.

Claims (1)

[Scope of Claims] 1. An optical detection chamber in which particles mixed with a different color flow down in a linear manner from a downflow gutter, and a light source, a light receiving element, etc. are provided around the flow trajectory, and an injection nozzle device that operates in communication with the light receiving element. In a photoelectric sorting room equipped with the following, the grain flux of the falling trajectory advances straight diagonally downward, and the light emitting window of the light source or the light receiving window of the light receiving element lens is adjacent to the light transmitting wall along the outer surface of the light transmitting window. Grain color sorting characterized in that air inlets and outlets are provided in contrast to both walls provided at the upper and lower parts of the light-transmitting wall of the optical detection chamber so as to generate an air curtain that passes in parallel. Machine dust control device. 2. The grain color sorter according to claim 1, wherein the wall provided at the lower part of the transparent wall is a grain scattering prevention wall provided between the optical detection chamber and the injection nozzle. Dust control device. 3. The dust-proofing device for a grain color sorter according to claim 1 or 2, wherein an air outlet provided on the lower wall of the light-transmitting wall is connected to an exhaust fan. 4. A dustproof device for a grain color sorter according to claim 1, 2, or 3, wherein the air inlet provided in the upper wall of the transparent wall is connected to a blower.