JP5063318B2 - Recovery control device for reticulated air chamber type wet specific gravity sorter using switch - Google Patents

Description

  The present invention generally relates to a recovery control technique in a reticulated air chamber type wet specific gravity sorter. More specifically, the present invention relates to a recovery control device used for a reticulated air chamber type wet specific gravity sorter using a switch.

  Plastic is used in a wide variety of fields such as automobiles, home appliances, various devices, containers, and the like, and in modern society, it cannot be realized without plastic. The amount of plastic used continues to increase year by year, and the amount of mixed plastic particles generated is increasing enormously. Under such circumstances, the use of mixed plastic particles is an important issue in forming a recycling society. In order to promote the use of mixed plastic particles as resources, it is necessary to establish a technology for selecting and reusing them as resources, and the need to select mixed plastic particles of different materials is increasing. There are a wide variety of plastic materials, which have the characteristics of low specific gravity and small difference in specific gravity.

  In recent years, the need to collect shredder dust mixed with different materials and recover useful materials has increased. For example, automobiles, home appliances, various devices, containers, etc. are landfilled in final disposal sites after the disposal of products, but the amount of processing continues to increase year by year, and the disposal of useful materials associated therewith is also enormous. In the formation of a recycling-oriented society, the use of such useful materials is an important issue. In order to promote the recycling of useful particles, it is necessary to establish a technology for selecting and reusing them as resources, but the materials that make up shredder dust are diverse, and the weight of the materials is also wide. However, existing recovery control technology has its limitations.

  On the other hand, a reticulated air chamber type wet specific gravity sorter is known as a machine that selectively recovers high quality coal mainly from raw coal. With reference to FIG. 14, the principle of operation of the reticulated air chamber type wet specific gravity sorter will be briefly described. The screened air chamber type wet specific gravity sorter has a sorting chamber in which the substance to be sorted is placed above and a pulsation chamber filled with water located below, and a mesh is placed between the sorting chamber and the pulsation chamber. Has been. An air chamber for entering / exiting air is arranged in the pulsation chamber, and the water level in the sorting chamber can be raised / lowered by raising / lowering the water level in the air chamber by entering / exiting air. . Then, by applying an appropriate water pulsation to the substance placed in the sorting chamber, a layer of substances with specific gravity is formed in the sorting chamber.

  Various techniques for recovering a desired substance using a reticulated air chamber type wet specific gravity sorter have been proposed (Patent Documents 1 to 5). For example, a method for detecting and controlling the layer thickness of the recovered material by creating a float that approximates the specific gravity of the recovered material, attaching a shaft above the float, and measuring the height of the shaft that swings up and down ( A shaft oscillation type float sensor) and a method of manually controlling the recovery device by observing the recovered substance are known.

JP-A-64-43355 JP 2000-185241 A JP 2001-220192 A JP 2004-034674 A JP 2004-143575 A

However, the above-described method using the shaft swing type float sensor has the following problems.
(1) When the buoyancy including the shaft weight is required and it is intended to be used for sorting materials with a light specific gravity such as plastic, the float shape becomes too large to accommodate the float in the sorting chamber. Can occur.
(2) Since the weight of the float increases and the inertial force increases, the sensitivity tends to decrease as a reaction.
(3) Since the float shape becomes large, it is extremely difficult to capture small pulsations.
(4) Since the float has a large shape and a large projected area, a large turbulent region is generated around the float, and depending on the type of the substance to be collected, the sorting accuracy may be adversely affected.
In addition, there is a problem that the accuracy of control is not guaranteed in the above-described method that relies on observation of the recovered material.
As described above, it is the actual situation that no satisfactory items can be found in the recovery control technology in the conventional reticulated air chamber type wet specific gravity sorter.

  The present invention has been devised in view of such circumstances, and recovery control in a reticulated air chamber type wet specific gravity sorter capable of sorting with good accuracy regardless of the type of substance to be collected. The purpose is to provide technology.

The metal material recovery control device for a reticulated air chamber type selective wet specific gravity sorter according to claim 1 of the present invention is a proximity switch arranged at a predetermined location in the sorting chamber or a vertical switch in the sorting chamber . A plurality of proximity switches arranged at different heights or at horizontal intervals across the discharge port of the substance to be recovered , and an arithmetic controller connected to the proximity switch The proximity switch has a function of detecting the presence of a metal substance, and operates the motor if an ON signal is sent to the arithmetic controller twice from the proximity switch during a preset chattering determination time. A chattering determination circuit configured to output a control signal for generating the control signal is provided.

  The recovery control device for a reticulated air chamber type wet specific gravity sorter according to claim 2 of the present application is the device according to claim 1, wherein the proximity switch is a discharge port for discharging a substance to be collected provided in the sorting chamber. It is characterized by being arranged in the vicinity.

  A recovery control device for a reticulated air chamber type wet specific gravity sorter according to claim 3 of the present application includes a guide type float level switch arranged so as to extend substantially vertically in the sort chamber, and a guide type float level switch. And a guide type float level switch having a float formed so as to slide along the rod and to have a desired specific gravity. A chattering determination circuit configured to output a control signal for operating the motor if an ON signal is sent from the guided float level switch twice during the chattering determination time. It is what.

  The recovery control device for the reticulated air chamber type wet specific gravity sorter according to claim 4 of the present application is the device of claim 3, in order to prevent the substance to be sorted from being caught in the gap between the rod and the float. The rod is formed so that the cross-sectional shape of the rod is a triangle.

  The recovery control device for a reticulated air chamber type wet specific gravity sorter according to claim 5 of the present application is the device of claim 3, in order to prevent entry of a substance to be sorted into the gap between the rod and the float, A cylindrical tube is attached to the upper part and / or the lower part of the float so as to surround the rod.

  The recovery control device for a reticulated air chamber type wet specific gravity sorter according to claim 6 of the present application is the device according to any one of claims 3 to 5, wherein a guide type float level switch is provided in the sorting chamber. The material to be collected is disposed in the vicinity of a discharge port through which the collected substance is discharged.

  According to the collection control device of the present invention, a desired material to be collected (particularly, a metal material in the device of the first embodiment) can be selectively collected from the material to be sorted with good accuracy. More specifically, in the recovery control device of the present invention, the ON / OFF signal can be output to the arithmetic controller while following well the fast pulsation of about 60 Hz and the small pulsation of about 10 cm. Since the recovery control device of the present invention uses a switch that outputs an on / off signal, the configuration of the arithmetic controller can be simplified as compared with a control device using a sensor. Since the guide type float level switch is less expensive than other types of float sensors, a recovery control device can be provided at a low cost for an apparatus provided with the guide type float level switch of the present invention.

  Next, with reference to the drawings, a recovery control device for a reticulated air chamber type wet specific gravity sorter according to a preferred embodiment of the present invention will be described in detail. FIG. 1 is a perspective view schematically showing a recovery control device according to a first embodiment of the present invention, which is used in a reticulated air chamber type wet specific gravity sorter 10. In FIG. 1, reference numeral 12 denotes a sorting chamber into which a substance to be sorted (hereinafter referred to as “substance to be sorted”) is charged, 12 a is an inlet for the sorted substance, 14 is a pulsation chamber filled with water, and 16 is a sorting chamber. A mesh disposed between the pulsating chamber 12 and the pulsation chamber 14, 18 an ejector for discharging a substance to be collected (hereinafter referred to as "substance to be collected"), and 20 a motor for driving the ejector. Yes. Note that the recovery control apparatus according to the first embodiment is used exclusively for recovery of metal substances.

  As shown in FIG. 2 (a) showing a cross section of the reticulated air chamber type wet specific gravity sorter 10, a discharge port 12 b through which a substance to be collected is discharged is provided at a position adjacent to the lower end of the sorting chamber 12. The ejector 18 is disposed adjacent to the discharge port 12b. As shown in FIG. 2B, the ejector 18 has a configuration in which a plurality of blades 18b (four in FIGS. 1 and 2) are attached to the shaft 18a, and is connected to the shaft 18a. By rotating and driving the motor 20, the blade 18b is rotated, whereby the substance to be collected located in the vicinity of the discharge port 12b is discharged. The ejector 18 itself is a known device.

  The collection control device includes proximity switches 22a and 22b arranged at different heights in the sorting chamber 12, respectively. Here, the proximity switch refers to an instrument that detects the approach of an object and the presence or absence of a nearby object without contact. In the JIS standard (JIS C 8201-5-2), as a proximity switch, an inductive proximity switch that detects the presence of a metal, a capacitive proximity switch that detects the presence of a metal and a non-metallic object, and an acoustic reflection object Four types of ultrasonic proximity switches that detect the presence of light and photoelectric proximity switches that detect the presence of an object are defined. In the present invention, the proximity switches are an inductive proximity switch and a capacitive proximity switch. Shall be pointed to.

  The collection control device also includes a calculation controller 24. The arithmetic controller 24 is connected to the proximity switches 22 a and 22 b through the cable 26 and is connected to the motor 20 through the cable 28. As the arithmetic controller 24 itself, a commonly used one may be used.

  In the arithmetic controller 24, on / off signals sent from the proximity switches 22a and 22b are converted into control signals for the motor 20, but these on / off signals cause chattering due to pulsation. A chattering determination circuit is provided. The chattering determination circuit turns on the motor control signal to turn on the motor 20 when the ON signal is sent twice during the preset chattering determination time t (seconds) (see FIG. 3B), and the chattering determination time t If the ON signal sent during (second) is one time, the motor control signal is turned OFF and the rotation drive of the motor 20 is stopped (see FIG. 3A). The operation of the chattering determination circuit will be described in more detail with reference to FIG. 3C. For each of t (1), t (2), t (3), and t (4), an ON signal is included twice. Therefore, the motor control signal is turned on, but there is no on signal between t (4) and t (5), so the motor control signal is temporarily turned off, and t (5), t (6 ), The ON signal is included twice, so the motor control signal is turned ON again. Note that the measurement of the number of ON signals in the chattering determination circuit starts a new chattering determination time from the second ON signal when a second ON signal is sent during the chattering determination time for a certain ON signal. (E.g., when the first (leftmost) ON signal in FIG. 3C is focused), the chattering determination time t (1) elapses from the time when the ON signal is sent. The chattering determination time t (1) is reset at the time when the signal is sent, and a new chattering determination time t (2) starts).

  In order to accurately grasp the presence of the substance to be recovered, the proximity switches 22a and 22b are preferably installed in the vicinity of the ejector 18 as shown in FIG. 2A, for example. However, the present invention is not limited to this. Absent. Further, when the sorting chamber 12 is large and the width of the discharge port 12b is wide, it is preferable to arrange a plurality of proximity switches in the width direction. If the sorting chamber 12 is small, the number of proximity switches may be one.

  Next, recovery control by the reticulated air chamber type wet specific gravity sorter recovery control device configured as described above will be described. The case where the metal substance A is selectively recovered from the substance X composed of the metal substance A (shown by “◯” in FIG. 4) and the non-metal substance B (shown by “△” in FIG. 4) is taken as an example. . In this example, when the ON signal is sent from the proximity switch 22a for a certain time, the motor 20 is driven to rotate at the first speed, and when the ON signal is sent from the proximity switch 22b for a certain time, the motor 20 is driven to the second speed (> first speed). ) To be rotationally driven.

  First, the substance X is charged into the sorting chamber 12 through the charging port 12a (see FIG. 4A). Subsequently, the water level in the air chamber is raised and lowered by the entry / exit of air to give pulsation of water to the substance X in the sorting chamber, so that the layer of the metallic substance A and the layer of the nonmetallic substance B are gradually formed in the sorting room 12. It is formed (see FIG. 4B). When the metal substance A starts to approach the proximity switch 22a (see FIG. 4C), an ON signal is sent to the arithmetic controller 24 via the cable 26. In this state, since the metal material A approaches or leaves the proximity switch 22a due to pulsation, the motor 20 is driven to rotate unless an ON signal is sent twice during a predetermined chattering determination time. The control signal is not sent. Next, when the metal material A completely reaches the installation level of the proximity switch 22a (see FIG. 4D), the metal material A will not leave the proximity switch 22a even if there is a pulsation. The ON signal is sent twice, and a control signal for rotating the motor 20 is sent to the motor 20 via the cable 28. As a result, the motor 20 operates at the first speed to rotate the ejector 18 (shown by a broken line arrow), and the metal substance A is discharged from the discharge port 22b. Next, the metal material A begins to approach the proximity switch 22b (see FIG. 4E), but at this stage, the metal material A is in a state of approaching or leaving the proximity switch 22b due to pulsation. Next, when the metal material A completely reaches the installation level of the proximity switch 22b (see FIG. 4 (f)), the metal material A will not leave the proximity switch 22b even if there is a pulsation. In this case, the ON signal is sent to the arithmetic controller 24 twice, so that the motor 20 operates at the second speed to rotate the ejector 18 (shown by a solid line arrow), and the metallic substance A is discharged from the discharge port 22b. Is done.

  Next, a collection control device according to a second embodiment of the present invention will be described. FIG. 6 is a perspective view schematically showing a recovery control device according to the second embodiment of the present invention, which is used in the mesh air chamber type wet specific gravity sorter 30. The collection control device according to the second embodiment of the present invention is the collection control according to the first embodiment of the present invention except that a guide type float level switch is arranged instead of the proximity switch. It has substantially the same configuration as the device.

  More specifically, the reticulated chamber type wet specific gravity sorter 30 in which the recovery control apparatus according to the second embodiment of the present invention is installed is composed of a sorting chamber 32 into which a substance to be sorted is charged, and water filling A pulsating chamber 34, a mesh 36 disposed between the sorting chamber 32 and the pulsating chamber 34, an ejector 38 for discharging the substance to be collected, and a motor 40 for driving the ejector 38. The sorting chamber 32 is provided with an inlet 32a for the substance to be sorted and an outlet 32b for discharging the substance to be collected. The collection control device according to the second embodiment of the present invention includes a guide type float level switch 42 disposed in the sorting chamber 32 so as to extend substantially in the vertical direction. As shown in FIG. 7, the guide-type float level switch 42 includes a rod 42a, a float 42b arranged to slide along the rod 42a, and a head portion 42c arranged at the upper end of the rod 42a. And the lower end of the rod 42 a is firmly fixed to the bottom of the sorting chamber 32.

  The float 42b of the guide type float level switch 42 is formed to have a desired specific gravity. In addition, the specific gravity of the float 42b is selected to be greater than the specific gravity of the liquid (for example, water) that is the sorting medium, which causes the float 42b to float on the liquid surface during the sorting operation. Is avoiding. As the guide type float level switch 42, a commonly used one may be used.

  During the sorting operation, the material to be sorted may be caught in the gap between the rod 42a and the float 42b, and the smooth sliding of the float 42b may be impaired. Therefore, in order to prevent such a situation from occurring, it is preferable to dispose a rod 42′a having a triangular cross-sectional shape and increase the gap between the rod 42′a and the float 42b (FIG. 8). (See (a)). Alternatively, a cylindrical tube 42b1 may be attached to the upper part and / or the lower part of the float 42b so as to surround the rod 42a so that the substance to be sorted does not easily enter the gap between the rod 42a and the float 42b. As this cylindrical tube, as shown in FIG. 8B, a tube provided with a plurality of small holes on the outer periphery may be used.

  In order to accurately grasp the boundary surface of the substance to be recovered, the guide type float level switch 42 is preferably installed in the vicinity of the ejector 38 as shown in FIG. 7, for example, but is not limited thereto. .

  The collection control device also includes a calculation controller 44. The arithmetic controller 44 is connected to the guide type float level switch 42 via a cable 46 and is connected to the motor 40 via a cable 48. As the arithmetic controller 44 itself, a commonly used one may be used.

  The arithmetic controller 44 is provided with a chattering determination circuit similar to the arithmetic controller 24 arranged in the collection control device according to the first embodiment.

Next, recovery control by the reticulated air chamber type wet specific gravity sorter recovery control device configured as described above will be described. Substance A (specific gravity γ _A , indicated by “◯” in FIG. 9) and substance B (specific gravity γ _B
The case where the substance A is selectively recovered from the substance X composed of <γ _A , indicated by “Δ” in FIG. 9) is taken as an example.

In this example, in order to detect the boundary surface between the substance A and the substance B after sorting, the specific gravity of the float 42b of the guide type float level switch 42 is (γ _A + γ _B
) / 2, the float 42b is formed.

  First, the substance X is charged into the sorting chamber 32 through the charging port 32a (see FIG. 9A). Next, a layer of substance A and a layer of substance B are gradually formed in the sorting chamber 32 by raising and lowering the water level in the air chamber by the entry / exit of air to give pulsation of water to the substance X in the sorting chamber. (See FIG. 9B). When the layer of the substance A and the layer of the substance B are formed, the float 32b slides in the rod 32a and is positioned at the boundary surface between the substance A and the substance B (see FIG. 9C). Then, an ON signal is sent from the guide type float level switch 42 to the arithmetic controller 44 via the cable 46, and then an operation signal is sent from the arithmetic controller 44 to the motor 40 via the cable 48. As a result, the motor 40 operates to rotate the ejector 38, and the substance A is discharged from the discharge port 32b (see FIG. 9D).

The substance X is initially in a state in which the substance A and the substance B are mixed (immediately after being introduced into the sorting chamber 32), but the substance A is given a pulsation of water and approaches the discharge port 32b. And substance B are gradually separated and stratified by the difference in specific gravity. In the above example, since the guide type float level switch 42 is installed in the vicinity of the ejector 38, the specific gravity of the float 42b is the average specific gravity of the substances A and B (γ _A
By setting + γ _B ) / 2, the boundary surface between the substance A and the substance B in the vicinity of the discharge port 12b can be accurately detected. However, when the guide type float level switch 42 cannot be installed in the vicinity of the ejector 38 due to physical reasons, the specific gravity of the float 42b is set to [(γ _A
+ Γ _B ) / 2] + α, it is possible to accurately detect the boundary surface between the substance A and the substance B.

  An experiment was conducted to verify the effect of the recovery control device according to the first embodiment described above. FIG. 10 is a diagram showing an outline of the experimental apparatus in this experiment. As shown in FIG. 10, three pairs of proximity switches were arranged immediately above the outlet of the sorting chamber. As the proximity switch, ED-130M manufactured by Keyence Corporation was used. A punching metal (φ8 mm) was used as the mesh located between the pulsation chamber and the sorting chamber. In the experiment, the chattering judgment time was set to 20 seconds, and the three pairs of proximity switches were set to operate independently (therefore, when the three pairs of proximity switches were turned on within 20 seconds, the objects to be collected were collected on the mesh. It was determined that the substance was 170 mm or more, and the ejector started to rotate (in other words, when any one of the three pairs of proximity switches is OFF for 20 seconds or more, the ejector stops rotating). In the experiment, the pulsation wave height was 10 cm and the frequency was 40 Hz.

  As a result of the experiment, when a proximity switch was used, there were 97 desired substances to be collected (in this experiment, metal substances) out of 136 samples collected from the outlet at a certain time. When the proximity switch was not used, 41 desired substances to be recovered were among 159 samples. That is, in the latter case, the recovery rate is about 25%, whereas in the former case using the proximity switch, the recovery rate reached 71%. In the latter case, the sample other than the substance to be recovered was often mixed with ordinary plastics, whereas in the former case, the sample other than the substance to be recovered was not printed board or plug. As can be seen, many composites of plastic and metal (that is, partially containing the substance to be recovered) were observed. This proved the usefulness of the recovery control device using a proximity switch. FIG. 11 shows a sample photograph when the proximity switch is used, and FIG. 12 shows a sample photograph when the proximity switch is not used.

  The recovery control device according to the second embodiment described above was applied to a screened air chamber specific gravity sorter for waste fluorescent tube separation and purification composed of a coarse sorting unit and a fine sorting unit. Guide type float level switches in which the specific gravity of the float is adjusted to 2 to 4 are arranged in the vicinity of the respective discharge ports of the coarse sorting unit and the fine sorting unit. As a result of the recovery work, it was verified that the separation and purification of lead glass, soda glass, quartz and hard glass were carried out effectively.

  The above-described recovery control device was applied to the separation and purification of plastic in shredder dust. Shredder dust with a particle size of 80 mm or less in advance was removed with a net air chamber type specific gravity sorter for rough sorting, and metal, earth and sand, floated material, etc. were removed, and only plastic was put into a crusher and sized to about 10 mm. . Then, the sized plastic is put into a reticulated air chamber type specific gravity sorter in which the collection control device of the present invention is installed, and is collected under a quiet sorting condition with a pulsation of 10 to 40 Hz and a wave height of about 30 to 100 mm. As a result, it was possible to confirm complete recovery of plastic having a heavy specific gravity (about 1.3 or more).

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is something.

  For example, in the first and second embodiments, a collection control device applied to a specific gravity sorter having a single sorting chamber has been described. However, as shown in FIGS. The present invention may be applied to a specific gravity controller in which sorting chambers (three in FIGS. 5 and 13) are connected in series. In such a specific gravity controller, a plurality of types of substances to be recovered can be continuously recovered.

It is the perspective view which showed typically the collection | recovery control apparatus based on the 1st Embodiment of this invention used for a reticulated air chamber type wet specific gravity sorter. FIG. 2A is a cross-sectional view of the reticulated air chamber type wet specific gravity sorter of FIG. 1, and FIG. 2B is a perspective view of the ejector. It is a figure for demonstrating a chattering judgment circuit. It is a figure for demonstrating a series of processes of the collection | recovery operation | work performed using the collection | recovery control apparatus of FIG. It is the figure which showed the example applied to the specific gravity sorter with which the some sorting chamber was connected in series. It is the perspective view which showed typically the collection | recovery control apparatus based on the 2nd Embodiment of this invention used for a reticulated air chamber type wet specific gravity sorter. FIG. 7 is a cross-sectional view of the reticulated air chamber type wet specific gravity sorter of FIG. 6. FIG. 8A is a view showing a modified form of the guide type float level switch, and FIG. 8B is a view showing another modified form of the guide type float level switch. It is a figure for demonstrating a series of processes of the collection | recovery operation | work performed using the collection | recovery control apparatus of FIG. 1 is a diagram illustrating an outline of an experimental apparatus in an experiment described in Example 1. FIG. 2 is a photograph showing experimental results in Example 1. FIG. 6 is another photograph showing the experimental results in Example 1. It is the figure which showed the example applied to the specific gravity sorter with which the some sorting chamber was connected in series. It is a figure for demonstrating the operating principle of a reticulated air chamber type wet specific gravity sorter.

Explanation of symbols

10, 30 Reticulated air chamber type wet specific gravity sorter 12, 32 Sorting chamber 14, 34 Pulsating chamber 16, 36 Mesh 18, 38 Ejector 20, 40 Motor 22 Proximity switch 24, 44 Operation controller 26, 28, 46, 48 Cable 42 Guided float level switch

Claims (6)

A sorting chamber into which a material to be sorted is charged, a pulsation chamber located below the sorting chamber, a mesh located between the sorting chamber and the pulsation chamber, and a metal material to be collected in the sorting chamber are discharged. A metal substance recovery control device disposed in a reticulated air chamber type selective wet specific gravity sorter equipped with an ejector and a motor for driving the ejector,
One proximity switch arranged at a predetermined location in the sorting chamber, a location in the sorting chamber having a different height in the vertical direction , or a horizontal interval across the discharge port of the substance to be recovered A plurality of proximity switches arranged at the locations,
An arithmetic controller connected to the proximity switch;
The proximity switch has a function of detecting the presence of a metallic substance ;
The arithmetic controller is provided with a chattering determination circuit configured to output a control signal for operating the motor when an ON signal is sent from the proximity switch twice during a preset chattering determination time. A device characterized by that.   The apparatus according to claim 1, wherein the proximity switch is disposed in the vicinity of a discharge port for discharging a substance to be collected provided in the sorting chamber. A sorting chamber into which a material to be sorted is charged, a pulsation chamber located below the sorting chamber, a mesh located between the sorting chamber and the pulsation chamber, and an ejector for discharging the material to be collected in the sorting chamber And a recovery control device arranged in a reticulated air chamber type selective wet specific gravity sorter equipped with a motor for driving the ejector,
A guided float level switch arranged to extend substantially vertically in the sorting chamber;
An arithmetic controller connected to the guided float level switch;
The guide type float level switch has a float formed to slide along the rod and have a desired specific gravity;
A chattering determination circuit configured to output a control signal for operating a motor if an ON signal is sent to the arithmetic controller from the guided float level switch twice during a preset chattering determination time. Provided,
A device characterized by that.   4. The apparatus according to claim 3, wherein the cross-sectional shape of the rod is triangular so as to prevent the material to be sorted from being caught in the gap between the rod and the float.   In order to prevent the material to be sorted from entering the gap between the rod and the float, a cylindrical tube is attached to the upper part and / or the lower part of the float so as to surround the rod. The apparatus of claim 3.   The said guide type float level switch is arrange | positioned in the vicinity of the discharge port in which the to-be-recovered substance provided in the said sorting chamber is discharged | emitted, The any one of Claim 3-5 characterized by the above-mentioned. The device described.