JPH01123678A - Wind sorting apparatus - Google Patents

Abstract

PURPOSE: To prolong the stagnation time on an air permeable tray from a material-to- be-sorted feeding port to a sorted material discharge port by nearly horizontally arranging this air permeable tray in the position of a sorted material discharge port, successively providing the device with a discharge port and a gas feed port and providing the device with a circulating pipeline for circulating gas for winnowing. CONSTITUTION: A gas feed valve is opened to feed the gas for winnowing into the circulating pipeline 22 and thereafter, a gas feed blower 25 is started to circulate and blast the air. The materials to be sorted are then charged into the feeder 39 of the winnowing machine 21 and are gradually fed into a main body 30 from the material-to-be-sorted feeding port 38. At this time, the materials to be sorted floated by the gas for winnowing blown up from below the air permeable tray 33 arranged nearly horizontally in the position of the sorted material discharge port 35. The heavy materials having a heavy weight fall onto the air permeable tray 33 and the heavy materials of a light weight splashed by the air current and are entrained in the discharge flow. These materials are sent through the inside of the circulating pipeline 32 to a solid-liquid separator 23. The heavy materials deposited on this tray 33 are successively recovered from a take-out pipe 37 while the discharge rate is controlled by the air pressure control damper 36 of the discharge port 35.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to wind sorting that uses wind power to separate light and heavy objects from a mixture of light and heavy objects. Regarding equipment.

[Prior Art] As a conventional wind sorting device, one shown in FIG. 3 is known. This wind sorting device has wind sorting@l',
This wind sorter! It consists of an air supply blower 2 that blows air selection gas into the air.

This wind sorting machine 1 is provided with a main body 3 having a generally cylindrical outer shape, and an air permeable shelf board 4 that vertically separates the main body 3 and is inclined. An input port 5 into which objects to be sorted are input is formed in the side wall of the main body 3, and an input hopper 6 is connected to the input port 5. Further, a take-out lower for taking out heavy items after sorting is formed on the side wall of the main body 3 at the lowest part of the breathable shelf board 4, and a take-out pipe 8 is connected to this take-out lower. The bottom of the main body 3 is tapered to form an air supply port 9, and the air supply blower 2 is connected to the air supply port 9 via an air supply pipe IO. Furthermore, an exhaust port 11 is formed at the top of the main body 3, and an exhaust vibrator I2 is connected to this exhaust port Il.

In such a wind sorting device, the air supply blower 2 is operated to send air selection gas into the main body 3 from the air supply port 9 at the bottom of the main body 3 of the wind sorting machine 1, and this gas is sent to the lower part of the air permeable shelf board 4. The material to be sorted is charged from the input hopper 6 while blowing up from the air, and air sorting is performed. That is, the material to be sorted that is input from the input hopper 6 slides down the inclined air-permeable shelf board 4 from the input port 5, and at this time, the light weight of the material to be sorted is removed by the gas flow blown up from below the breathable shelf board 4. The substances are blown up together with the gas flow and are discharged from the exhaust port 11 to the outside of the system. Moreover, the heavier items among the items to be sorted further slide down on the air permeable shelf board 4 and are collected from the take-out pipe 8.

[Problems to be Solved by the Invention] However, in the wind sorting device having such a structure, the time for sorting is equal to the time for the objects to be sorted to slide down inside the main body 3 along the breathable shelf board 4. Therefore, the residence time of the material to be sorted on the air-permeable shelf board 4 is short, resulting in a disadvantage that the separation performance is low.

Furthermore, in the conventional wind sorting device, the pressure inside the main body 3 becomes unbalanced with the external pressure due to the gas flow blown upward from the bottom inside the main body 3, and the gas flow is discharged from the input port 5 and the take-out lower. Therefore, there are inconveniences such as difficulty in inputting objects to be sorted and in collecting heavy objects.

[Means for Solving the Problems] The present invention provides a sorting system in which a hollow cylindrical main body is provided with an air supply port at the bottom and an exhaust port at the top, and a material input port and a material discharge port are provided on the side wall of the main body. In the wind sorting device, the air-permeable shelf board is provided with a material discharge port and is provided with a breathable shelf board horizontally partitioning the axis of the main body so as to connect the material input port and the material discharge port to be sorted. is arranged substantially parallel to the sorted material discharge port position, and a circulation pipe is provided in which the air selection gas is circulated by connecting the exhaust port and the air supply port, and the said sorted material discharge port and the circulation pipe are connected. The solution was to install a damper for regulating air pressure in each of the two.

[Operation] In this invention, by arranging an air-permeable shelf board in the wind sorting machine almost horizontally in line with the position of the sorted material outlet, the sorted material outlet is closer to the sorted material outlet than the sorted material input port. This increases the residence time on the air-permeable shelves and improves separation performance.

In addition, although the ventilated shelf is arranged almost horizontally in accordance with the position of the sorted material discharge port, in order to allow the flow of the material to be sorted on the ventilated shelf board, it is necessary to ,
A pressure regulating damper is placed on the air supply port piping to make it possible to adjust the pressure within the main body.

Moreover, by connecting the exhaust port at the top of the main body and the air supply port at the bottom to form a circulation pipe, it is possible to circulate and reuse the supply air flow, which is particularly effective when maintaining the temperature at a constant temperature. In addition, since the pressure regulating damper provided at the air supply port is provided in the circulation pipe connecting the air supply port and the exhaust port, fine adjustment can affect the air volume on both the air supply side and the exhaust side. Therefore, the pressure inside the cylinder of the main body can be adjusted effectively and well so that the material to be processed can flow to the discharge port.

The present invention will be described in detail below.

FIG. 1 shows an example of the wind sorting device of the present invention. The wind sorting device of this invention includes a wind sorting machine 2I,
A solid/gas separator 23 and a pressure regulating damper 24 are provided in the middle of the circulation pipe 22 connected from the wind sorter 21.
, an air supply blower 25, and an air supply valve 26.

The wind sorter 21 blows gas into the lower part of the generally cylindrical main body 30, suspends the objects to be sorted introduced from the side of the main body 30 in this gas, and sorts the objects into heavy objects and light objects according to their weight. The heavy objects are taken out from the side of the main body 30, and the light objects are discharged from the upper part of the main body 30 along with the exhaust flow.

The circulation pipe 22 that connects each component of this wind sorting device is formed by piping the air supply port 31 and the exhaust port 32 of the wind sorting machine 21, and the circulation pipe 22 connects the air inlet 31 and the exhaust port 32 of the wind sorting machine 21. The materials and exhaust stream are sent through a circulation line 22 to a solid/gas separator 23, such as a cyclone separator, where they are separated into light materials and an exhaust stream, where the lightweight materials are recovered and the gases are discharged. be done. The discharged gas passes through the circulation pipe 22, is sent to the suction side of the supply air blower 25, is pressurized here, and then passes from the discharge side of the supply air blower 25 through the circulation pipe 22 and is again exposed to wind power. It is blown into the lower part of the sorter 21 and used for circulation.

Further, the pressure of the gas blown through the circulation pipe 22 is maintained at a predetermined pressure by a pressure regulating damper 24 provided in the middle of the circulation pipe 22. Air selection gas is supplied from the valve 26.

Further, as shown in FIG. 2, the wind sorter 2I has a generally cylindrical main body 30 whose bottom diameter is reduced downward to form a tapered shape, and the lowest part thereof is opened to form an air supply port 3]. It becomes. 4. The diameter of the neck portion of the main body 30 is reduced in stages twice, and the top thereof is opened to form an exhaust port 32. Further, an air permeable shelf plate 33 is provided approximately in the middle of the main body 30 in the vertical direction so as to divide the main body 30 in the vertical direction. This breathable shelf board 33 has a large number of ventilation holes 34 formed therein, and is attached almost horizontally to the main body 30. The term "substantially horizontal" here refers to an angle of ±10°100 with respect to a horizontal plane. Also,
A sorted material discharge port 35 for taking out heavy objects after sorting is formed on the side wall of the main body 30 near and above the breathable shelf board 33, and a pressure regulating damper 36 is installed in this sorted material discharge port 35. A take-out pipe 37 is arranged in a row with a slight downward slope. Further, on the upper side of the main body 30, a sorted material inlet 38 for inputting the sorted material is formed at a distance sufficiently higher than the air permeable shelf board 33; A feeder 39 such as a vibration feeder or the like is connected with a flexible tube or the like. And main body 3
The air supply blower 25 is connected to the air supply port 3I of 0 through the air supply pipe 40 by the circulation pipe 22, and the exhaust port 32 is connected to the exhaust pipe 4! A solid/gas separator 23 is connected via a circulation line 22 .

In a wind sorting device with such a structure, the mass air supply valve 2
6 is opened and air selection gas is supplied into the circulation pipe 22, and then the air supply blower 25 is started to circulate and blow air. Next, the objects to be sorted are put into the feeder 39 of the wind sorter 21, and gradually introduced into the main body 30 from the object to be sorted input port 38. The objects to be sorted are suspended by the wind separation gas blown up from below the breathable shelf board 33, the heavy objects fall onto the breathable shelf board 33, and the light objects are scattered by the airflow. Riding on the exhaust flow, it is sent from the exhaust port 32 through the circulation pipe 22 to the solid/gas separator 23 .

The heavy objects accumulated on the breathable shelf board 33 are sequentially removed from the exhaust port 35.
The gas is collected from the take-out pipe 37 while the discharge speed is controlled by the pressure regulating damper 36. The light substances sent to the solid/gas separator 23 and the exhaust stream are separated here, the solid light substances are recovered, and the exhaust stream is sucked by the air supply blower 25 installed in the circulation pipe 22. used in circulation.

The wind-selecting gas is supplied to the air pressure regulating damper 24 installed in the circulation pipe 22 and the take-out pipe 37 of the wind-selecting machine 2I.
Air pressure adjustment damper 36 and air supply blower 25 provided inside
The pressure of the circulating air in the circulation pipe 22 is adjusted by the output of the . This makes it possible to efficiently sort objects to be sorted, as well as to easily input objects to be sorted and recover heavy objects.

Then, the output of the air supply blower 25 and the opening degree of the atmospheric pressure regulating damper 24 and the atmospheric pressure regulating damper 36 provided at the sorted material discharge port 35 are adjusted according to the average weight of the heavy objects among the objects to be sorted. By changing the wind speed and volume of the gas blown out from the air permeable shelf plate 33 of the sorter 21, it is possible to sort various objects to be sorted.

In the wind sorting device having such a configuration, a horizontal compensating shelf board 33 is arranged in the wind sorting machine 21, and the material to be sorted is supplied from above this breathable shelf board 33. Therefore, the residence time of the materials to be sorted on the air-permeable shelf board 33 is increased, separation performance is improved, and it is extremely unlikely that light materials will be mixed with heavy materials. In addition, a damper 36 for air pressure adjustment is provided on the take-out pipe 37 of the wind sorter 21 to circulate the wind selection gas in the circulation pipe 22, and the damper 24 for air pressure adjustment
By appropriately adjusting the air supply blower 25 and the air supply valve 26, the air selection gas is not blown out from each part of the main body 30, so that heavy objects can be easily taken out and materials to be screened can be fed.

[Example 1] Using a device as shown in Figures 1 and 2, freeze-crushed lemon sacs were used as the material to be sorted, and from this, impurities such as seeds, albedo, and sac membrane were separated as lightweight materials. It was separated and the canopy was sorted as a heavy item.

The outline of the wind sorting device of the present invention used is as follows.

Breathable shelf board area 630 x 350mm Breathable shelf board Hole diameter 2,5 mm, Pitch 3,5 m
m Wind selection gas -50℃ cold air circulation air volume
40II13/min Air speed inside the sorting machine 3.
0 m/sec Air supply blower capacity 45 m'/min Contact time* Approximately 40 seconds Processing amount 450 kg/hour Time Refers to the residence time of heavy objects in the wind sorter.

As a result of the sorting, there was no ejection of wind-selecting gas from the inlet or outlet for the objects to be sorted, so it was possible to easily supply the objects to be sorted and recover the heavy objects.

[Comparative example] In addition, as a comparative example, using a conventional vertical wind sorting device,
In the same manner as in the example, freeze-crushed lemon canards were used as the material to be sorted, and from this, impurities such as seeds, albedo, and sac membrane were separated as light items, and the canadian bags were sorted as heavy items. .

The outline of the conventional wind sorting device used for sorting is as follows.

Breathable shelf area: 630x350mm Breathable shelf: Hole diameter: 2.5mm, pitch: 3.5mm Wind selection gas -50°C cold air volume
40m3/min Wind speed inside the sorter: 3.0m/sec Air supply blower capacity: 45m3/min Contact time: Approximately 10 to 15 seconds Processing m
450 kg/hour The results are shown in Table 1! From the results shown in Table 1 and above, when sorting was performed using the wind sorting device of the present invention, the separation performance of heavy materials from the objects to be sorted was improved compared to the conventional wind sorting device.

[Effects of the Invention] As explained above, the wind sorting device of the present invention has a hollow cylindrical main body with an air supply port at the bottom and an exhaust port at the top, and a material input port and a sorting material inlet on the side wall. In the wind sorting device, a wind sorting device is provided with a sorted material discharge port for discharging materials, and includes an air permeable shelf plate placed horizontally across the axis of the main body so as to connect the sorted material input port and the sorted material discharge port. , the air permeable shelf board is arranged almost parallel to the sorted material discharge port, and a circulation pipe is provided in which the air selection gas is circulated by connecting the exhaust port and the air supply port; Since the outlet and the circulation pipe are each provided with a damper for regulating the air pressure, the residence time of the material to be sorted on the ventilation shelf from the material input port to the material discharge port is increased. The pressure inside the cylinder of the main body can be efficiently adjusted using the pressure regulating damper to facilitate the flow of the material to the discharge port, thereby improving the separation performance of light objects in the material to be sorted. and easy recovery.

Furthermore, the circulation pipe makes it possible to recirculate and reuse the supply air flow, which is particularly suitable for maintaining the temperature at a constant temperature.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an example of the wind sorting device of the present invention, and FIG. 2 is a schematic sectional view showing an example of the wind power sorting machine used in the present invention. FIG. 3 is a schematic cross-sectional view of a conventional wind sorting device. 2I... Wind sorter, 22... Circulation pipe, 24... Damper for pressure adjustment, 30... Main body, 31... Air supply port, 32... Exhaust port, ゛33...・Breathable shelf board, 35... Sorted material outlet, 36... Atmospheric pressure adjustment damper, 38... Sorted material input port.

Claims (1)

[Scope of Claims] A hollow cylindrical main body having an air supply port at the bottom and an exhaust port at the top, and a side wall thereof having a material input port and a material discharge port for discharging the material, In the wind sorting device, the air-permeable shelf board is arranged to horizontally partition the axis of the main body so as to connect the material input port and the material discharge port, and the ventilated shelf board is located at the material discharge port. A circulation pipe is provided that is arranged substantially parallel to the exhaust port and the air supply port to circulate the air selection gas, and a damper for adjusting the air pressure is provided at the sorted material discharge port and the circulation pipe, respectively. A wind sorting device characterized by being provided with.