JP2018091787A - Metal detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal detection device having high processing capacity and a good usability, and capable of preventing an object to be selected from being stopped to be discharged due to bridge phenomenon at a discharge port of a hopper by making a flow quantity relatively large while adjusting the flow quantity so that the object to be selected is not clogged in its way to an internal space of a cylindrical body from a hopper.SOLUTION: A metal detection device 1 radially arranges a detection coil 3 outward of a cylindrical body 2 made from a non-magnetic material. An object to be selected fed from a hopper 4 falls downward by the gravity and passes through an internal space S of the cylindrical body 2 in a state that the detection coil 3 is given a high frequency current so as to be oscillated, and a metal foreign matter is detected by detecting an impedance change of the detection coil 3 when the metal foreign matter inside the object to be selected passes through the internal space S. The metal detection device further includes a vibratory rectilinear feeder 5 having a trough 6 which integrates the hopper 4 separated from the cylindrical body 2 to a discharge port 6B of the trough 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a metal detection device that detects and sorts metal foreign matter mixed in an object to be sorted.

  As a metal detection device that detects and sorts out metal foreign matter mixed in the object to be selected, a detection coil is disposed radially outward of a non-magnetic cylindrical body, and a high-frequency current is applied to the detection coil for oscillation. In this state, the object to be sorted put into the hopper falls by gravity and passes through the internal space of the cylindrical body, and the impedance of the detection coil when the metal foreign matter in the material to be sorted passes through the internal space. There is one that detects the metal foreign object by detecting a change (see, for example, Patent Documents 1 to 3).

Japanese Patent Laid-Open No. 58-199085 JP 2002-156462 A Japanese Patent Laid-Open No. 2006-145804

When the diameter of the cylindrical body and the detection coil is reduced in order to increase the detection sensitivity of the metal foreign object, when the flow rate of the material to be sorted put into the hopper increases, the material to be sorted becomes a cylinder from the hopper depending on the size of the material to be sorted. It may become clogged while reaching the internal space of the body.
When such clogging occurs, the supply of the object to be sorted is cut off, and the clogging is eliminated by vibrating the connecting pipe or the like provided between the cylindrical body and the hopper with a vibration generator or an impact generator. In many cases, measures are taken (see, for example, paragraph [0040] of Patent Document 3).

In addition, when the diameter of the cylindrical body and the detection coil is reduced, the discharge port of the hopper is also reduced in diameter, so when the amount of objects to be sorted into the hopper increases, a so-called bridge phenomenon may occur at the discharge port of the hopper. . When the bridging phenomenon occurs, the discharge of the sorting object from the hopper discharge port stops.
Furthermore, even when the diameter of the cylindrical body and the detection coil is not reduced, the object to be sorted is a long and slender object that is easily deformed like tea other than green tea such as sencha, and the object to be applied to the hopper. When the input amount of the sorted material increases, the discharge of the sorted material may stop due to the bridge phenomenon at the discharge port of the hopper.
In order to prevent such a bridging phenomenon from occurring, for example, it is conceivable to attach a vibration generator similar to the countermeasure for eliminating the clogging to the outside of the hopper wall. If the wall of the hopper is vibrated by the vibration generator, the flow of the objects to be sorted can be improved.
However, if a metal foreign object is detected while vibrating the hopper wall, it may be assumed that the detection accuracy is lowered or erroneously detected due to the hopper vibration adversely affecting the detection of the impedance change of the detection coil.

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem by increasing the flow rate as much as possible while adjusting the flow rate so that the object to be sorted does not clog in the middle of reaching the internal space of the cylindrical body from the hopper. Therefore, it is possible to provide a metal detection device with high processing capability and ease of use that can prevent the discharge of the sorting object from being stopped by the bridge phenomenon.

In order to solve the above problems, the metal detection device according to the present invention has a detection coil disposed radially outward of a non-magnetic cylindrical body, and oscillates by applying a high-frequency current to the detection coil. The object to be sorted introduced from the hopper falls by gravity and passes through the internal space of the cylindrical body, and a change in impedance of the detection coil is detected when the metal foreign matter in the material to be sorted passes through the internal space. A metal detecting device for detecting the metal foreign object by
The hopper separated from the cylindrical body;
A vibratory linear feeder having the trough integrated with the hopper at the trough outlet;
(Claim 1).

According to such a configuration, since the hopper is integrated with the trough discharge port of the vibration type linear feeder, the hopper is selected by controlling the intensity and frequency of vibration applied to the trough of the vibration type linear feeder. The amount of material input can be controlled. Accordingly, the flow rate can be increased as much as possible while adjusting the flow rate so that the object to be sorted does not get clogged while reaching the internal space of the cylindrical body from the hopper.
In addition, since the hopper is integrated with the trough discharge port of the vibratory linear feeder, the hopper is vibrated by the vibratory linear feeder, so the discharge of the sorting object is stopped by the bridge phenomenon at the hopper outlet. There is nothing to do.
In addition, since the hopper is separated from the cylindrical body, the vibration of the hopper by the vibration type linear feeder does not affect the detection coil arranged radially outward of the cylindrical body, so detection due to the vibration of the hopper There is no loss of accuracy or false detection.
Therefore, the processing capacity and usability of the metal detector can be greatly improved.

Here, the object to be sorted is a thing that tends to get entangled itself, or an irregular shape with irregular irregularities on the surface, and a large friction.
In a preferred embodiment, the width of the trough gradually decreases from the trough supply port to the discharge port (Claim 2).

According to such a configuration, since the width of the trough is gradually reduced from the trough supply port to the discharge port, the width of the trough supply port becomes larger than the width of the trough discharge port. Therefore, since the discharge port of the supply hopper provided in the supply port of the trough can be made larger than the input port of the hopper integrated with the discharge port of the trough, the discharge port of the supply hopper or the trough supply port itself becomes entangled. It is possible to suppress clogging of objects to be sorted, which are easy to shape, or irregularly shaped and have irregular irregularities on the surface and have high friction, and can be smoothly conveyed to the discharge port of a small-diameter hopper by trough vibration.
Furthermore, if the bottom wall of the trough is tilted forward and downward as it goes from the trough supply port to the discharge port, the conveying ability of the vibration type linear feeder can be enhanced.

  Further, the hopper discharge port is displaced in a direction away from the trough so that the object to be sorted entering the hopper from the discharge port of the trough falls to the discharge port of the hopper while drawing a parabola. This is a more preferred embodiment (Claim 3).

According to such a configuration, the hopper discharge port is displaced in a direction away from the trough, and an object to be sorted, such as an object that tends to get entangled itself, is drawn from the trough discharge port while drawing a parabola. Since it falls to an exit, the said to-be-sorted item is hard to accumulate in a hopper.
Therefore, since the object to be sorted, which is an object that itself is easily entangled, becomes more difficult to clog in the hopper, the object to be sorted can be smoothly flowed into the internal space of the cylindrical body.

Furthermore, in the multi-channel type metal detector comprising a plurality of the cylindrical body, the detection coil, and the hopper,
The plurality of hoppers are integrated into one trough discharge port of the one vibratory linear feeder,
It is also a preferred embodiment that the object to be sorted is distributed to the plurality of hoppers by a partition plate provided on the upstream side of the trough discharge port (Claim 4).

According to such a configuration, a plurality of hoppers are integrated into one trough discharge port of one vibration type linear feeder, and the objects to be sorted are distributed to the plurality of hoppers by the partition plate. By controlling the intensity and frequency of vibration applied to the trough of the linear feeder, it is possible to control the input amount of the object to be sorted into each of the plurality of hoppers. As a result, in the multi-channel metal detector, the flow rate can be increased as much as possible while adjusting the flow rate so that the objects to be sorted do not get clogged while reaching the internal space of the cylindrical body from each of the hoppers.
In addition, since multiple hoppers are integrated into one trough outlet of one vibratory linear feeder, multiple hoppers are vibrated by one vibratory linear feeder, so multi-channel metal detection In the apparatus, the discharge of the objects to be sorted does not stop due to the bridge phenomenon at the discharge ports of the plurality of hoppers.
In addition, since the hopper of each channel is separated from the cylindrical body, the vibration of the hopper by the vibration type linear feeder does not affect the detection coil arranged radially outward of the cylindrical body, which There will be no reduction in detection accuracy or erroneous detection.
Therefore, the processing capability and usability of the multi-channel metal detector can be greatly improved.
In addition, the input of the objects to be sorted into the plurality of hoppers of the multi-channel metal detector is performed by one vibration type linear feeder. While being controllable, the manufacturing cost can be reduced as compared with a configuration in which a vibration type linear feeder is provided for each channel of the multi-channel type metal detector.

Furthermore, it is provided with a connecting pipe which is a tapered pipe which is located between the upper end part of the cylindrical body and the lower end part of the hopper and which is reduced in diameter downward, and the connecting pipe and the hopper are separated.
In a more preferred embodiment, the object to be sorted that has entered into the connecting pipe in a dense state by gravity is free to fall in a rough state without being densely packed in the connecting pipe (Claim 5).

According to such a configuration, the cylindrical body is provided between the upper end portion of the cylindrical body and the lower end portion of the hopper so as to be a tapered pipe that is reduced in diameter downward. In addition, the diameter of the detection coil can be reduced.
In addition, since the objects to be sorted that have entered into the connecting pipe from the hopper in a dense state due to gravity fall in a rough state without being tightly packed in the connecting pipe, the objects to be sorted are accelerated by gravity and the falling speed is increased. It passes through the detection coil in a state.
Therefore, while suppressing an increase in manufacturing cost with a simple configuration, it is possible to improve the detection accuracy of the metal foreign matter mixed in the object to be sorted and improve the processing capability.
In addition, since the hopper excited by the vibration type linear feeder is separated from the connecting pipe, the vibration of the hopper affects the detection coil disposed radially outward of the cylindrical body located below the connecting pipe. As a result, the detection accuracy is not lowered and erroneous detection due to the vibration of the hopper does not occur.

As described above, according to the metal detection device of the present invention, since the amount of the object to be sorted to the hopper can be controlled by the vibrating linear feeder, the object to be sorted reaches the internal space of the cylindrical body from the hopper. The flow rate can be increased as much as possible while adjusting the flow rate so that it does not clog.
In addition, since the hopper is vibrated by the vibration type linear feeder, the discharge of the sorting object does not stop due to the bridge phenomenon at the discharge port of the hopper.
Furthermore, since the vibration of the hopper by the vibration type linear feeder does not affect the detection coil arranged radially outward of the cylindrical body, the detection accuracy is not lowered and erroneous detection due to the vibration of the hopper does not occur.
Therefore, there is a remarkable effect that the processing ability and usability of the metal detection device can be greatly improved.

It is a perspective view of the metal detection apparatus which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional front view similarly. The shape of a trough and a hopper is shown, (a) is a schematic plan view, (b) is a schematic partial longitudinal cross-sectional front view. It is a schematic plan view which shows the modification of the shape of a hopper. The modification of a supply hopper is shown, (a) is a schematic longitudinal cross-section left side view, (b) is a schematic partial vertical cross-section front view. It is a general | schematic fragmentary longitudinal cross-section front view which shows the example which supplies a to-be-sorted item directly to a trough from a bucket type vertical conveyor without a supply hopper. It is a perspective view of the metal detection apparatus which concerns on Embodiment 2 of this invention. Similarly, it is a longitudinal sectional front view, showing only the main part. It is a top view of a trough. It is the partial exploded perspective view which looked at the trough from back diagonally upward.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the following, front and rear, right and left are defined in the direction in which the object to be sorted is fed by the vibration type linear feeder, and a view seen from the left is a front view.
The object to be sorted by detecting a metal foreign object with the metal detection device of the present invention is a food, a drug, or an industrial product that is a powder, a rod, a flat, a granule, or a solid. The “bar-shaped body” and the “flat body” include not only a linear object but also a curved object, and includes not only a relatively long object but also a relatively short object. In addition, the “bar-shaped body” and the “flat body” include those whose thickness and cross-sectional shape are not uniform.

Here, in the food or medicine, powdered powder, powdered starch, pasta powder, buckwheat flour, kinako powder, sugar, salt, matcha tea, seasoning, powdered powder, etc., sticks and flats, short pasta, noodles , Dried pasta, dried seaweed, barley young leaves, sencha, gyokuro, bancha, tea other than matcha tea, tablets, capsules, etc. Examples of solids such as nuts such as instant coffee and almonds and supplements include solid soups such as consomme or bouillon.
Moreover, in industrial products, as powder, activated carbon powder, ceramic powder, resin powder, etc., as rod-shaped body and flat body, case parts of connectors, rubber, resin crushed material, resin crushed material, resin molded product, etc. Examples of the granular material include activated carbon particles, wood chips, glass particles, and resin pellets. Examples of the solid material include connectors and resin molded products.

<Embodiment 1>
The metal detector according to the first embodiment of the present invention is an object in which individual objects to be selected are easily entangled, or an object having an irregular shape with irregular irregularities on the surface and large friction. In other words, when the material to be sorted is flowed into a hopper, a pipe or the like, it can be suitably used when the fluidity is low and the bridge or clogging is likely to occur.
The metal detection apparatus according to Embodiment 1 of the present invention is particularly suitable when the tea is a tea other than matcha such as the sencha, for example, which is an elongated product that tends to get entangled or a flat shape that tends to overlap. Further, in the metal detection device according to Embodiment 1 of the present invention, the object to be sorted is an irregular shape such as a resin pulverized material or a resin pulverized material, with irregular irregularities on the surface, and a large friction. It can also be used suitably in some cases.

As shown in the perspective view of FIG. 1 and the longitudinal cross-sectional front view of FIG. 2, a metal detection device 1 according to Embodiment 1 of the present invention includes a housing 1A, a ceramic (non-magnetic) cylindrical body 2, a cylinder A detection coil 3 disposed radially outward of the body 2, a hopper 4 positioned above the cylindrical body 2, a vibratory linear feeder 5 having a trough 6 for putting an object to be sorted into the hopper 4, and a trough 6 A supply hopper 11 is provided to supply an object to be selected to the supply port 6A.
Further, the metal detection device 1 includes a connecting pipe 7 provided between the upper end portion of the cylindrical body 2 and the lower end portion of the hopper 4, a reed tube 8 provided below the cylindrical body 2, and a lower portion of the reed tube 8. A sorting damper 9 provided, a swing driving device 12 that swings the sorting damper 9 about the swing shaft 12A, and a discharge chute 10 that discharges an object to be sorted including metal foreign objects to the outside of the apparatus are provided.
Furthermore, the metal detection device 1 detects an impedance change of the detection coil 3 when an oscillating means that oscillates by applying a high-frequency current to the detection coil 3 and a metallic foreign object in the object to be sorted passes through the internal space S of the cylindrical body 2. And a control device 13 having a drive control means for the swing drive device 12, and a control device 14 for the vibration type linear feeder 5.

Here, the hopper 4 is integrated with the discharge port 6 </ b> B of the trough 6, and the hopper 4 is separated from the connecting pipe 7.
Therefore, the vibration of the vibration type linear feeder 5 is transmitted to the hopper 4 and is not transmitted to the connecting pipe 7 and the cylindrical body 2.
When the metal detector 1 does not have the connecting pipe 7, the hopper 4 is separated from the cylindrical body 2, so that the vibration of the vibration type linear feeder 5 is not transmitted to the cylindrical body 2.

The feed amount of the object to be sorted supplied from the supply hopper 11 to the supply port 6A of the trough 6 of the vibration type linear feeder 5 changes the strength and frequency of vibration applied to the trough 6 by the control device 14 of the vibration type linear feeder 5. Can be controlled. Therefore, it is possible to control the amount of the objects to be sorted that are put into the hopper 4 from the outlet 6B of the trough 6.
In a state where a high-frequency current is applied to the detection coil 3 by the oscillating means of the control device 13, the object to be sorted put into the hopper 4 falls by gravity and passes through the internal space S of the cylindrical body 2. Then, the metallic foreign matter is detected by detecting the impedance change of the detection coil 3 when the metallic foreign matter in the object to be sorted passes through the internal space S by the detecting means of the control device 13.
When the metal foreign object is detected in this way, the metal drive is performed by driving the swing driving device 12 by the drive control means of the control device 13 and swinging the sorting damper 9 around the swing shaft 12A. Since the to-be-sorted object is discharged from the discharge chute 10 to the outside of the apparatus, the to-be-sorted object containing the metallic foreign matter does not flow to the next process below.

According to such a configuration, since the hopper 4 is integrated with the discharge port 6B of the trough 6 of the vibration type linear feeder 5, the intensity and frequency of vibration applied to the trough 6 of the vibration type linear feeder 5 can be controlled. Thus, the input amount of the object to be sorted into the hopper 4 can be controlled. Accordingly, the flow rate can be increased as much as possible while adjusting the flow rate so that the object to be sorted does not get clogged in the middle of reaching the internal space S of the cylindrical body 2 from the hopper 4 via the connecting pipe 7.
Further, since the hopper 4 is integrated with the discharge port 6B of the trough 6 of the vibration type linear feeder 5, the hopper 4 is vibrated by the vibration type linear feeder 5, so that the bridge phenomenon occurs at the discharge port 4B of the hopper 4. The discharge of the selection object does not stop.
Furthermore, since the hopper 4 is separated from the connecting pipe 7, the vibration of the hopper 4 caused by the vibration type linear feeder 5 is applied to the detection coil 3 arranged radially outward of the cylindrical body 2 below the connecting pipe 7. Since no influence is exerted, a decrease in detection accuracy or erroneous detection due to vibration of the hopper 4 does not occur.
Therefore, the processing capability and usability of the metal detector 1 can be greatly improved.

As shown in FIG. 1, the cross section of the trough 6 cut along a plane including the vertical direction and the horizontal direction forms a groove shape (channel shape) formed by the bottom wall 6C and the left and right side walls 6D and 6D.
Further, as shown in the schematic plan view of FIG. 3A and the schematic partial longitudinal sectional front view of FIG. 3B, the width B of the trough 6 gradually decreases from the supply port 6A of the trough 6 to the discharge port 6B. . Further, the bottom wall 6C of the trough 6 is inclined forward and downward. The bottom wall 6C of the trough 6 may be horizontal.

In FIG. 3 (b), the object A to be entangled is supplied to the supply port 11 A of the supply hopper 11 and supplied from the discharge port 11 B of the supply hopper 11 to the supply port 6 A of the trough 6.
The object A to be sorted placed on the bottom wall 6C of the trough 6 is sent from the supply port 6A toward the discharge port 6B by the vibration type linear feeder 5.
Since the width B of the trough 6 gradually decreases from the supply port 6A of the trough 6 to the discharge port 6B, the width of the supply port 6A of the trough 6 becomes larger than the width of the discharge port 6B of the trough 6. Therefore, since the discharge port 11B of the supply hopper 11 provided in the supply port 6A of the trough 6 can be made larger than the input port 4A of the hopper 4 integrated with the discharge port 6B of the trough 6, the discharge port 11B of the supply hopper 11 or the trough 6 The supply port 6 </ b> A suppresses clogging of the object A to be entangled, and can be smoothly conveyed to the discharge port 4 </ b> B of the small-diameter hopper 4 by the vibration of the trough 6.
Furthermore, when the bottom wall 6C of the trough 6 is inclined forward and downward as it goes from the supply port 6A of the trough 6 to the discharge port 6B, the conveyance capability of the vibration type linear feeder 5 can be enhanced.

Further, as shown in FIGS. 3 (a) and 3 (b), the object A entering the hopper 4 from the outlet 6B of the trough 6 draws a parabola as indicated by an arrow C in FIG. 3 (b). The outlet 4B of the hopper 4 is displaced in the direction away from the trough 6 (forward) so as to fall to the outlet 4B of the hopper 4.
Accordingly, the object A to be entangled itself falls from the outlet 6B of the trough 6 to the outlet 4B of the hopper 4 while drawing a parabola, so that the object A is not easily stored in the hopper 4. .
Therefore, the object A to be sorted, which is an object that is easily entangled, is less likely to be clogged in the hopper 4, so that the object A can be smoothly flowed into the internal space S (see FIG. 2) of the cylindrical body 2. .

  The shape of the hopper 4 is not limited to the shape of the truncated cone side surface in which the upper inlet 4A and the lower outlet 4B are circular as shown in FIGS. 1 to 3, but are shown in the plan view of FIG. The upper inlet 4A may be trapezoidal or rectangular, and the lower outlet 4B may be circular.

The shape of the supply hopper 11 is not limited to that shown in FIGS. 1 to 3 in which the upper part is cylindrical, the middle part is a side surface of the truncated cone, the diameter is reduced downward, and the lower part is cylindrical.
For example, as shown in the schematic vertical cross-sectional left side view of FIG. 5A and the schematic partial vertical cross-sectional front view of FIG. 5B, the front wall 11C of the supply hopper 11 is vertical and the lower part of the rear wall 11D is the front. A front opening E may be provided below the front wall 11C.
By sliding the height adjustment plate 15 in the vertical direction as indicated by the arrow D in the figure on the front side of the front wall 11C, the supply amount of the object A to the trough 6 can be adjusted.

As shown in the schematic partial longitudinal sectional front view of FIG. 6, the bucket-type vertical conveyer feeds the objects to be sorted to the trough 6 of the vibration type linear feeder 5 without using the supply hopper 11. You may make it carry out directly like 16 as the arrow F.
In such a configuration, the pulsating flow due to the discharge of the sorting object A for each bucket 17 can be conveyed while being smoothed by the vibrating linear feeder 5.

<Embodiment 2>
The metal detection apparatus according to Embodiment 2 of the present invention is suitable when the object to be sorted is a granular material such as a resin pellet.
In the metal detection device 1 shown in the perspective view of FIG. 7 and the longitudinal cross-sectional front view of FIG. 8, and the trough 6 shown in the plan view of FIG. 9 and the partially exploded perspective view of FIG. Since the corresponding parts are shown, detailed description of the same reference numerals as those in the first embodiment will be omitted.

  The metal detection device 1 according to Embodiment 2 of the present invention is an example of a multi-channel metal detection device including a plurality of cylindrical bodies 2, detection coils 3, and hoppers 4. This is a significant improvement. And two vibration type linear feeders 5 having troughs 6 are arranged side by side. From one trough 1, four sensor parts (cylindrical bodies) are passed through four hoppers 4,. 2 and the detection coil 3) to be sorted.

As shown in FIGS. 9 and 10, three partition plates 18,... Supported by a support plate 19 are provided on the upstream side of the four outlets 6B,. An object can be distributed to the four outlets 6B,.
The partition plates 18,... Are fixed to the lower surface of the support plate 19, and the bolts 20A,... Are inserted into the through holes 19A,. Are arranged at predetermined positions.
As shown in FIG. 9, the left and right hoppers 4, 4,... Are staggered in the front-rear direction, but depending on the configuration, the left and right hoppers 4, 4,. You may install in parallel.

According to such a configuration, a plurality of hoppers 4,... Are integrated into the discharge ports 6B,... Of one trough 6 of one vibration type linear feeder 5, and the objects to be sorted are separated by the partition plates 18,. 4 and so on, by controlling the intensity and frequency of vibration applied to the trough 6 of the vibratory linear feeder 5, the amount of the object to be sorted to each of the plurality of hoppers 4 can be controlled. . As a result, in the multi-channel metal detection device 1, the flow rate can be increased as much as possible while adjusting the flow rate so that the objects to be sorted do not clog in the middle of reaching the internal space S of the cylindrical body 2 from each of the hoppers 4,.
In addition, since the plurality of hoppers 4 are integrated with the outlets 6B of the trough 6 of one vibratory linear feeder 5, the plurality of hoppers 4,. Since the vibration is applied, the discharge of the objects to be sorted is not stopped by the bridge phenomenon at the discharge ports 4B of the plurality of hoppers 4,.
Further, since the hopper 4 of each channel is separated from the connecting pipe 7, vibrations of the hoppers 4,... By the vibration type linear feeder 5 are radially outward of the lower cylindrical bodies 2. Since it does not affect the arranged detection coils 3,..., The detection accuracy is not lowered and erroneous detection due to the vibration of the hoppers 4,.
Therefore, the processing capability and usability of the multi-channel metal detection device 1 can be greatly improved.
Furthermore, the objects to be sorted are put into the plurality of hoppers 4 of the multi-channel type metal detection apparatus 1 by one vibrating linear feeder 5 (in this embodiment, the objects to be fed to the four hoppers 4,. Since the input of the sorting object is performed by one vibration linearly moving feeder 5), the number of objects to be selected to be input to each of the plurality of hoppers 4,... The manufacturing cost can be reduced as compared with a configuration in which the vibration type linear feeder 5 is provided for each channel of the metal detection device 1.

<Effects of connecting pipe>
As shown in FIGS. 2 and 8, in Embodiments 1 and 2, a connecting pipe 7 is provided between the upper end portion of the cylindrical body 2 and the lower end portion of the hopper 4.
The connecting pipe 7 is a taper pipe that is reduced in diameter so that an object to be sorted that has entered into the connecting pipe 7 in a dense state due to gravity does not clog in the connecting pipe 7 and falls freely in a rough state. The inner diameter of the discharge port 4B of the hopper 4, the length of the connecting pipe 7 (set to 50 mm or more) and the inner diameter of the lower end are determined.
The inner diameter of the cylindrical body 2 is set to be the same as the inner diameter of the lower end of the connecting pipe 7 or slightly larger than the inner diameter of the lower end of the connecting pipe 7.

Therefore, a connecting pipe 7 that is a tapered pipe having a reduced diameter is provided between the upper end portion of the cylindrical body 2 and the lower end portion of the hopper 4, whereby the cylindrical body 2 positioned below the connecting pipe 7 and The diameter of the detection coil 3 can be reduced.
In addition, since the object to be sorted that has entered into the connecting pipe 7 from the hopper 4 in a dense state by gravity falls in a rough state without being tightly packed in the connecting pipe 7, the object to be sorted is accelerated by gravity. It passes through the detection coil 3 in a state where the falling speed is increased.
Therefore, while suppressing an increase in manufacturing cost with a simple configuration, it is possible to improve the detection accuracy of the metal foreign matter mixed in the object to be sorted and improve the processing capability.

  In particular, when the object to be sorted is a granular material, as shown in FIG. 8 of the second embodiment, the length of the connecting pipe 7 is increased, the lower diameter of the connecting pipe 7, the inner diameter of the cylindrical body 2, and the detection coil. In the configuration in which the inner diameter of the cylinder 3 is made as small as possible, the detection sensitivity of the metal foreign matter is greatly improved by reducing the diameter of the cylindrical body 2 and the detection coil 3 (for example, the inner diameter of the cylindrical body 2 is about 10 mm to 15 mm) and Since the flow rate ((falling speed) × (cross-sectional area)) of the material increases, the processing capacity is greatly improved.

DESCRIPTION OF SYMBOLS 1 Metal detector 1A Case 2 Cylindrical body 3 Detection coil 4 Hopper 4A Input port 4B Discharge port 5 Vibrating linear feeder 6 Trough 6A Supply port 6B Discharge port 6C Bottom wall 6D Side wall 7 Connection tube 8 Lead tube 9 Sorting damper 10 Discharge Chute 11 Supply hopper 11A Supply port 11B Discharge port 11C Front wall 11D Rear wall 12 Oscillation drive unit 12A Oscillation shafts 13 and 14 Control unit 15 Height adjustment plate 16 Bucket type vertical conveyor 17 Bucket 18 Partition plate 19 Support plate 19A through Hole 20A Bolt 20B Nut A Sorted object B Trough width E Front opening S Internal space

Claims (5)

A detection coil is disposed outside the cylindrical body made of a non-magnetic material, and a high-frequency current is applied to the detection coil so that the detection coil is oscillated. A metal detection device that detects the metal foreign object by detecting an impedance change of the detection coil when the metal foreign object in the object to be sorted passes through the internal space and passes through the internal space.
The hopper separated from the cylindrical body;
A vibratory linear feeder having the trough integrated with the hopper at the trough outlet;
Characterized by comprising,
Metal detector. The object to be sorted is a thing that tends to get entangled itself, or an irregular shape with irregular irregularities on the surface, and a thing with high friction,
The width of the trough gradually decreases from the trough supply port to the discharge port.
The metal detection device according to claim 1. The object to be sorted entering the hopper from the outlet of the trough is displaced in a direction away from the trough so that the object to be sorted falls into the outlet of the hopper while drawing a parabola.
The metal detection device according to claim 1 or 2. In the multi-channel metal detection device including a plurality of the cylindrical body, the detection coil, and the hopper,
The plurality of hoppers are integrated into one trough discharge port of the one vibratory linear feeder,
The sorting object is distributed to the plurality of hoppers by a partition plate provided on the upstream side of the trough discharge port.
The metal detection device according to claim 1. A connecting pipe which is a tapered pipe which is located between the upper end portion of the cylindrical body and the lower end portion of the hopper and which is reduced in diameter downward is formed, and the connecting pipe and the hopper are separated.
The to-be-sorted object that has entered the connecting pipe in a dense state by gravity falls freely in a rough state without being densely packed in the connecting pipe,
The metal detection apparatus of any one of Claims 1-4.

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