Mobile conductor detection cylinder unit and mobile conductor detection system

Abstract

The present invention provides a mobile conductor detection system that allows for easy modification of the factory layout in which the system is used, and has a structure that prevents materials moving through the piping from remaining inside. It also provides a mobile conductor detection cylinder unit used in the mobile conductor detection system, with the wires of a mobile conductor detection coil wound around it. [Solution] The mobile conductor detection system 201 is characterized in that the mobile conductor detection cylinder unit 21, which detects a conductor to be detected, which is a conductive solid, from among a plurality of solids moving inside a part of a synthetic resin pipe 202, is cylindrical, with its inner surface 22a forming the inner circumferential surface of the cylindrical body, and comprises an outer cylinder portion 22 that can be attached to a part of the pipe facing radially inward, and a mobile conductor detection coil 26 which has a conductor wound around the outer cylinder portion and is a coil for detecting the conductor to be detected.

Description

Technical Field

[0001] The present invention relates to a moving conductor detection cylinder unit and a moving conductor detection system, and particularly to a moving conductor detection cylinder unit and a moving conductor detection system for detecting a detected conductor that moves inside a part of a pipe, such as metal.

Background Art

[0002] Conventionally, there is a foreign object detection device that detects foreign objects from materials such as granular materials that sequentially pass through one pipe and the other pipe by interrupting a device between one pipe and the other pipe (Patent Document 1). By passing this material through a detection coil provided in the device, foreign objects such as metal particles can be detected from the material.

[0003] The conventional foreign object detection device reduces stray current that may affect the detection result by surrounding a non-metallic pipe around which the conductor of the detection coil is wound with a shield housing, and can more reliably detect foreign objects.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventional mobile conductor detection systems, which include foreign object detection devices, require the placement of a non-metallic pipe around which the detection coil's wire is wound, between two pipes in which the conductor to be detected moves. Therefore, the entire piping layout, including the system, must be planned and installed in advance during the construction phase of the factory where the conductor to be detected is manufactured, stored, transported, processed, or used. Furthermore, if there are changes in these manufacturing, storage, transported, processed, or used processes in the factory, and the placement of the mobile conductor detection system needs to be changed or increased or decreased, the entire piping layout must be replaced, requiring extensive construction work.

[0006] Furthermore, when using conventional systems, materials moving through the piping come into direct contact with the inner surface of non-metallic pipes. Therefore, when removing an installed system for maintenance or replacement and installing another system, in order to prevent contamination, it is necessary to remove, for example, the non-metallic pipe around which the wires of the detection coils in the system are wound, and clean and completely remove any remaining materials.

[0007] In view of these problems, the present invention aims to provide a moving conductor detection system that allows for easy modification of the layout of the factory using the system and has a structure that prevents materials moving through the piping from remaining inside. The invention also aims to provide a moving conductor detection cylinder unit used in a moving conductor detection system, in which the wires of a moving conductor detection coil are wound around the periphery. [Means for solving the problem]

[0008] (1) The present invention provides a mobile conductor detection cylinder unit for detecting a conductor to be detected, which is a conductive solid, from among a plurality of solids moving inside a part of a synthetic resin pipe, the unit being cylindrical, having an inner surface that forms the inner circumferential surface of a cylindrical body, and comprising an outer cylinder portion that can be attached to a part of the pipe facing radially inward, and a mobile conductor detection coil which has a conductor wound around the outer cylinder portion and is a coil for detecting the conductor to be detected.

[0009] In other words, the mobile conductor detection cylinder unit of the present invention comprises an outer cylinder that can be mounted inward from the outside of a pipe, and a mobile conductor detection coil around the outer cylinder with a conductor wound around it. Therefore, the mobile conductor detection cylinder unit of the present invention does not need to be inserted between two pipes, as is the case with conventional mobile conductor detection systems using non-metallic pipes, but can be mounted on the outside of a single pipe.

[0010] As a result, the mobile conductive detection system equipped with the mobile conductive detection cylinder unit of the present invention can use existing piping in the same layout even when the placement of the unit is changed, increased, or decreased, and the mobile conductive detection cylinder unit can be attached to the outside of the existing piping. Therefore, large-scale construction work is not required.

[0011] Furthermore, in the mobile conductor detection system, the material moving within the piping remains within the existing piping and does not come into contact with the outer cylinder of the mobile conductor detection cylinder unit, nor does any residue remain inside it. As a result, when the mobile conductor detection cylinder unit is removed from the piping for system maintenance or replacement, it is not necessary to clean the unit and completely remove any material.

[0012] Thus, the mobile conductive material detection cylinder unit of the present invention allows for easy changes to the factory layout, and prevents materials from remaining inside the pipes during transport.

[0013] (2) The outer cylinder portion may also be made of synthetic resin.

[0014] In other words, the outer cylinder portion of the moving conductor detection cylinder unit of the present invention is mounted radially inward from the outside of the pipe, so that the moving solid does not directly contact the inner surface. In contrast, in cases where the moving solid directly contacts the inner surface, such as with the non-metallic pipes of conventional moving conductor detection systems, if the solid is a hard material, there is a high risk that the inner surface will be worn down by the moving solid. When the inner surface of a non-metallic pipe is worn down, the wear on the inner surface increases, which can shorten the lifespan of the non-metallic pipe. For this reason, in the manufacture of conventional pipes, it is common to use specially hard materials such as ceramics.

[0015] However, the outer cylinder portion of the moving conductor detection cylinder unit of the present invention is not susceptible to wear on its inner surface by the moving solid, and therefore does not require the use of special hard materials such as ceramic. As a result, the outer cylinder portion can be made of synthetic resin such as polyacetal, and since such synthetic resins are relatively easy to procure, manufacturing costs can be reduced.

[0016] (3) The device may also be provided with a housing that has magnetic shielding properties and covers the outer cylinder portion and the coil for detecting the moving conductor.

[0017] In other words, a coil having a conductor wound around the outer cylinder generates a magnetic field to detect the conductor to be detected. The mobile conductor detection cylinder unit of the present invention minimizes the influence of external magnetic fields by confining the magnetic field generation area as much as possible inside a housing with magnetic shielding. Therefore, the mobile conductor detection cylinder unit of the present invention enables more accurate detection of the conductor to be detected.

[0018] (4) The coil for detecting the moving conductor also has a conductor that is wound multiple times, and the conductor that has been wound n times (where n is a natural number) and the conductor that has been wound at a different number of times than the nth time may be in parallel in the direction of the center line of the outer cylinder.

[0019] In other words, in the mobile conductor detection cylinder unit of the present invention, multiple conductors with different circumferences are arranged in parallel along the direction of the center line of the outer cylinder, thereby reducing the number of times the conductors need to be overlapped when winding them away from the center line. Alternatively, it may be possible to eliminate the need to overlap them away from the center line. As a result, the overall distance from the center line to the wound conductors can be shortened. Furthermore, in the mobile conductor detection cylinder unit, the coil containing these conductors generates a magnetic field to detect the conductor to be detected. By confining the range of magnetic field generation to a range as close to the center line as possible, the influence of external magnetic fields can be suppressed. Therefore, the mobile conductor detection cylinder unit of the present invention enables more accurate detection of the conductor to be detected.

[0020] (5) The present invention provides a mobile conductor detection system comprising a piping made of synthetic resin and a mobile conductor detection cylinder unit that detects a conductor to be detected, which is a conductive solid, from among a plurality of solids moving inside a part of the piping, wherein the mobile conductor detection cylinder unit is cylindrical and comprises an outer cylinder portion that can be mounted radially inward in a part of the piping, and a mobile conductor detection coil which has a conductor wound around the outer cylinder portion and is a coil for detecting the conductor to be detected.

[0021] In other words, the mobile conductor detection system of the present invention comprises a mobile conductor detection cylinder unit, an outer cylinder portion that is mounted inward from the outside of a pipe, and a mobile conductor detection coil around the outer cylinder portion, with a conductor wound around it. Therefore, this mobile conductor detection cylinder unit can be mounted on the outside of a single pipe.

[0022] As a result, even when changing or increasing / decreasing the placement of the mobile conductive material detection system of the present invention, it is only necessary to move the placement of the mobile conductive material detection cylinder unit, which is attached from the outside of the piping. Therefore, the placement can be easily changed without requiring large-scale construction work.

[0023] (6) Further, the pipe and the outer cylinder part may be arranged so as to have a gap between an outer surface of a part of the pipe and an inner surface of the outer cylinder part.

[0024] By the way, it is known that a solid moving inside a pipe made of synthetic resin is likely to be charged with static electricity during movement. Also, for example, when the moving solid is a pellet of synthetic resin, it is known that this tendency is remarkable. And when such a solid is charged with static electricity, a spark occurs between the solid and the coil, and it is known that this often causes a malfunction when detecting a detected conductor by this coil.

[0025] In contrast, the inventor has found that when making the distance between the moving solid and the coil large, even if the solid is charged with static electricity, a spark is unlikely to occur. And by providing a gap between the outer surface of the pipe and the inner surface of the outer cylinder part, the distance between the solid moving inside this pipe and the coil wound around the outer cylinder part can be made larger, and as a result, it has been found that the occurrence of a spark can be suppressed. Thus, with the moving conductor detection system of the present invention, more accurate detection of the detected conductor becomes possible.

[0026] (7) Further, the pipe and the outer cylinder part may be arranged so as to have a gap between an outer surface of a part of the pipe and an inner surface of the outer cylinder part, and the outer surface may be a cylindrical surface having a center line common with a part of the pipe.

[0027] That is, when the outer surface of the pipe is a cylindrical surface, due to the gap between the cylindrical surface and the inner surface of the outer cylinder part, the distance between the solid moving inside this pipe and the coil wound around the outer cylinder part can be made large. As a result, the occurrence of a spark can be suppressed.

[0028] (8) Further, an outer surface of a part of the pipe has a convex part protruding outward in the radial direction and a concave part recessed inward, and the pipe and the outer cylinder part may be arranged such that the top of the convex part abuts against the inner surface of the outer cylinder part.

[0029] In other words, in the moving conductor detection system of the present invention, there is a difference in diameter between the top of a convex portion and the bottom of a concave portion provided on the outer surface of a pipe, such as a spiral hose. Therefore, when the top of the convex portion abuts the inner surface of the cylindrical outer portion, this difference in diameter allows the distance between the solid moving inside the pipe and the coil wound around this outer portion to be increased. As a result, it is possible to suppress the generation of sparks, and the moving conductor detection system of the present invention enables more accurate detection of the conductor to be detected.

[0030] (9) Alternatively, the outer surface of a part of the piping may have a protrusion that is radially outward and a recess that is inward, and the piping and the outer cylinder may be arranged such that there is a gap between the protrusion and the inner surface of the outer cylinder.

[0031] In other words, in the moving conductor detection system of the present invention, the outer surface of a pipe, such as a spiral hose, has radial protrusions and recesses, and a gap is provided between these protrusions and the inner surface of the outer cylinder. Thus, in addition to the difference in diameter between the top of the protrusion and the bottom of the recess, a gap is provided between the protrusion and the inner surface, allowing the distance between the solid moving inside the pipe and the coil wound around the outer cylinder to be further increased. As a result, it is possible to suppress the generation of sparks, and the moving conductor detection system of the present invention enables more accurate detection of the conductor to be detected.

[0032] (10) Alternatively, the piping and the outer cylinder portion may be arranged such that a portion of the outer surface of the piping and the inner surface of the outer cylinder portion are in close contact with each other.

[0033] In other words, even if a portion of the outer surface of the piping and the inner surface of the outer cylinder are in close contact with each other with no gap between them, the distance between the conductor to be detected and the coil for detecting the moving conductor can be increased by, for example, increasing the radial thickness of the outer cylinder. This suppresses the generation of sparks and enables accurate detection of the conductor to be detected.

[0034] (11) The moving conductor detection device may also be mounted on the piping such that the central axis of the moving conductor detection coil is in the horizontal direction, or inclined at an angle of less than 90° with respect to the horizontal direction.

[0035] In other words, the mobile conductor detection system of the present invention comprises a mobile conductor detection cylinder unit, an outer cylinder portion that is mounted inward from the outside of the pipe, and a mobile conductor detection coil around the outer cylinder portion, allowing the mobile conductor detection cylinder unit to be mounted from the outside of the pipe. Due to this configuration, even with horizontal pipes or pipes angled to the horizontal, the mobile conductor detection cylinder unit can be easily mounted so that the center line of the pipe and the central axis of the mobile conductor detection coil coincide by placing the outer cylinder portion over the pipe. [Effects of the Invention]

[0036] Thus, we can provide a moving conductor detection system with a structure that allows for easy changes in the system's placement. We can also provide a moving conductor detection system that enables more accurate detection of conductors to be detected. Furthermore, we aim to provide a moving conductor detection system with a structure that prevents materials moving through the piping from remaining inside. Finally, we aim to provide a moving conductor detection cylinder unit used in these moving conductor detection systems, with the wires of a moving conductor detection coil wound around it. [Brief explanation of the drawing]

[0037] [Figure 1](a) A front view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the first embodiment of the present invention. (b) A plan view of the same. [Figure 2] This is a plan cross-sectional view of a moving conductor detection cylinder unit according to the first embodiment of the present invention. [Figure 3] (a) This is a front cross-sectional view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the first embodiment of the present invention. (b) This is a plan cross-sectional view of the same. [Figure 4] (a) and (b) are enlarged plan cross-sectional views, each showing a portion of the plan cross-sectional view in Figure 3(b). [Figure 5] This is a schematic diagram showing the state in which the mobile conductor detection system according to the first embodiment of the present invention is installed. [Figure 6] This is a schematic diagram of a frame used in a mobile conductor detection system according to the first embodiment of the present invention. [Figure 7] This is a plan cross-sectional view of a prototype of a mobile conductor detection cylinder unit according to the first embodiment of the present invention. [Figure 8] (a) A plan cross-sectional view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in a prototype of the mobile conductor detection system according to the first embodiment of the present invention. (b) An enlarged plan cross-sectional view showing a portion of the plan cross-sectional view in (a). [Figure 9] This table shows the experimental conditions and results for Comparative Example 1, Comparative Example 2, and Example 1. [Figure 10] (a) A front view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the second embodiment of the present invention. (b) A plan view of the same. [Figure 11] This is a plan cross-sectional view of a moving conductor detection cylinder unit according to a second embodiment of the present invention. [Figure 12] This is a plan cross-sectional view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the second embodiment of the present invention. [Figure 13](a) A front view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the third embodiment of the present invention. (b) A plan view of the same. [Figure 14] This is a plan cross-sectional view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the third embodiment of the present invention. [Figure 15] (a) A front view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the fourth embodiment of the present invention. (b) A plan view of the same. [Figure 16] This is a plan cross-sectional view showing the vicinity of the portion to which the mobile conductor detection cylinder unit is attached in the mobile conductor detection system according to the fourth embodiment of the present invention. [Modes for carrying out the invention]

[0038] [First Embodiment] A first embodiment of the present invention is illustrated with reference to Figures 1 to 6. In Figure 1, 11 is a mobile conductor detection cylinder unit, and 101 is a mobile conductor detection system. The mobile conductor detection system 101 comprises a synthetic resin pipe 102 and the mobile conductor detection cylinder unit 11. Figures 1(a) and 1(b) show a front view and a top view of the mobile conductor detection system 101 near the part to which the mobile conductor detection cylinder unit 11 is attached, respectively. In Figure 1(b), the portion of the pipe 102 shown by the hidden line is called the internal unit pipe 102a. The internal unit pipe 102a refers to the pipe 102 from the front to the rear when the mobile conductor detection cylinder unit 11 is attached. However, if the mounting position of the mobile conductor detection cylinder unit 11 relative to the pipe 102 is changed, the pipe 102 from the front to the rear after the change in position is called the internal unit pipe 102a. In this specification, the internal piping 102a is also referred to as part of the piping. In each figure, the direction of arrow U indicates above the mobile conductor detection cylinder unit 11, the internal piping 102a, and other parts of the piping 102 near the internal piping 102a, and the direction of arrow D indicates downwards. The direction of arrow L indicates to the left, and the direction of arrow R indicates to the right. Also, the direction of arrow F indicates forward, and the direction of arrow B indicates backward.

[0039] Multiple solids move inside the piping 102, including the internal piping 102a. Examples of these moving solids include granulated synthetic resin pellets, various solid resins, chemicals, pharmaceuticals, and food products. All of these solids are non-conductive or have low conductivity. Although not shown in the diagram, these non-conductive or low-conductivity solids are called low-conductivity materials I. These low-conductivity materials I moving inside the piping 102, including the internal piping 102a, may contain metal fragments themselves or pellets containing metal fragments. Although not shown in the diagram, solids that have conductivity due to the presence of such metal fragments or metal fragments are called detectable conductors E. These low-conductivity materials I and detectable conductors E are transported by air blown from a blower (not shown). These low-conductivity materials I and the detectable conductors E that may be mixed in with the low-conductivity materials I are collectively called passing solids S. Passing solids S include cases where no detectable conductors E are mixed in. These solid materials S can then be transported from front to back or from back to front within the piping 102 shown in Figure 1(a). They can also be transported from front to back or from back to front within the piping 102 shown in Figure 1(b). Unless otherwise specified, the solid materials S will move backward from front to back in Figure 1(a) and from front to back in Figure 1(b).

[0040] The moving conductor detection cylinder unit 11 detects the conductor to be detected E from among the passing solids S. The moving conductor detection system 101 is equipped with such a moving conductor detection cylinder unit 11.

[0041] Figure 2 shows a plan cross-sectional view of the mobile conductor detection cylinder unit 11 as seen from above, after it has been cut along line AA shown in Figure 1(a). The mobile conductor detection cylinder unit 11 comprises an outer cylinder portion 12 which is cylindrical in the front-rear direction. The outer cylinder portion 12 has a center line C1 in the front-rear direction. The mobile conductor detection cylinder unit 11 also has a through hole 13 in the front-rear direction, and the inner surface 12a of the outer cylinder portion 12 constitutes the inner circumferential surface of the through hole 13. This inner surface 12a has the shape of the inner circumferential surface of a cylinder. The outer cylinder portion 12 is made of a synthetic resin which is an insulator such as polyacetal (POM). Furthermore, the mobile conductor detection cylinder unit 11 comprises a roughly rectangular parallelepiped housing 14 which has a center line common to the center line C1 of the outer cylinder portion 12 and is hollow. Front opening 14c and rear opening 14d are drilled in the front 14a and rear 14b of the housing 14, respectively, which are the front and rear openings of the through hole 13. The housing 14 is made of a metal that is conductive and has magnetic properties, such as iron. The front and rear ends of the outer cylinder portion 12 are fixed to the back side of the front 14a and the back side of the rear 14b, respectively.

[0042] Furthermore, the conductor 15 is wound around the outer circumferential surface 12b of the outer cylinder portion 12, in contact with the outer circumferential surface 12b of the outer cylinder portion 12. Therefore, the conductor 15 is wound in a roughly circular shape. In the example shown in Figure 2, the conductor 15 is wound around four times. This conductor 15 is connected to a detector T (not shown) which is installed on the outside of the mobile conductor detection cylinder unit 11. The position of the conductor 15 after the first turn is indicated by reference numeral 15a in Figure 2. The conductor 15 in this state is called the first-turn conductor 15a. Next, the position of the second turn is indicated by reference numeral 15b, and the conductor 15 in this state is called the second-turn conductor 15b. Similarly, the conductor 15 in the third and fourth turns are called the third-turn conductor 15c and the fourth-turn conductor 15d, respectively. The first-turn wire 15a and the second-turn wire 15b are wound in the direction of the centerline C1 of the outer cylinder 12, with the front and rear sides respectively. The third-turn wire 15c and the fourth-turn wire 15d are wound in the direction of the centerline C1 of the outer cylinder 12, with the rear and front sides respectively. The wires 15 are insulated copper wires, and in their insulated state, the first-turn wire 15a and the second-turn wire 15b, and the third-turn wire 15c and the fourth-turn wire 15d are in contact in the front-to-back direction. Also, in their insulated state, the first-turn wire 15a and the fourth-turn wire 15d, and the second-turn wire 15b and the third-turn wire 15c are in contact in the radial direction of the outer cylinder 12. The wires 15 are wound in this manner to form the coil 16 for detecting the moving conductor. Since the coil 16 for detecting the moving conductor is wound around the outer surface 12b, its central axis C2 coincides with the center line C1 of the outer cylinder portion 12.

[0043] Figure 3(a) shows a front cross-sectional view of the moving conductor detection system 101 as viewed from the front after it has been cut along the BB line shown in Figure 1(b). Figure 3(b) shows a top cross-sectional view of the moving conductor detection system 101 as viewed from above after it has been cut along the AA line shown in Figure 1(a). The center line C3 of the internal piping 102a coincides with the center line C1 of the outer cylinder portion 12 and the central axis C2 of the moving conductor detection coil 16. In this embodiment, the piping 102, including the internal piping 102a, has an outer surface 102b which has a convex portion 103 that spirals in the direction of the center line C3 and protrudes radially outward, and a concave portion 104 that spirals in the direction of the center line C3 and is concave radially inward, opposite to the convex portion 103. A piping 102 having such a spiral convex portion 103 and concave portion 104 is known, for example, as a spiral hose. The inner circumferential surface of the pipe 102, including the internal pipe 102a, has a circular cross-sectional shape and is formed smoothly. This allows the passing solid S to move smoothly inside the pipe 102, including the internal pipe 102a. The pipe 102 is made of a synthetic resin, such as polyvinyl chloride (PVC).

[0044] The mobile conductor detection cylinder unit 11 is mounted such that its outer cylinder portion 12 is mounted radially inward relative to the internal piping 102a. At this time, the front surface 14a and rear surface 14b of the housing 14 abut against the outer surface 102b of the internal piping 102a. The mobile conductor detection cylinder unit 11 is supported such that the front opening 14c of the front surface 14a and the rear opening 14d of the rear surface 14b abut against the outer surface 102b. Figures 4(a) and 4(b) show enlarged plan cross-sectional views of the area around the front surface 14a, respectively, for the right and left halves of Figure 3(b). As shown in Figure 4(a), the front surface 14a abuts against the convex portion 103, and as shown in Figure 4(b), the front surface 14a abuts against the concave portion 104. Although not shown, an enlarged plan cross-sectional view of the area around the rear surface 14b is shown in a similar manner, but inverted vertically.

[0045] As shown in Figures 4(a) and 4(b), the top 103a of the convex portion 103, which is located radially to the outermost part, abuts against the inner surface 12a of the outer cylinder portion 12. At this time, there is a difference in diameter between the top 103a of the convex portion 103 and the bottom 104a of the concave portion 104. A gap 105 is formed between the bottom 104a and the inner surface 12a. In other words, there is a gap 105 between the outer surface 102b and the inner surface 12a of the internal piping 102a of the unit.

[0046] Figure 5 illustrates the installation of the mobile conductor detection system 101. This mobile conductor detection system 101 includes a piping 102 connecting a tank T for storing granulated synthetic resin pellets, which are fixed passages S, and a molding machine M for melting and molding these pellets, and a mobile conductor detection cylinder unit 11 attached to the piping 102. The tank T and the molding machine M are fixed on the horizontal floor F of the factory. The pellets stored in the tank T are transported to the molding machine M by air supplied from a blower (not shown).

[0047] The mobile conductor detection cylinder unit 11 can be attached to any point on the pipe 102. In Figure 5, the mobile conductor detection cylinder unit 11A is shown when attached to point A where the pipe 102 extends horizontally, the mobile conductor detection cylinder unit 11B is shown when attached to point B where the pipe 102 extends vertically, and the mobile conductor detection cylinder unit 11C is shown when attached to point C where the pipe 102 extends diagonally at an angle of approximately 45° to the horizontal direction. One or more of these points A to C are attached to the mobile conductor detection cylinder unit 11. The shape of the outer surface, cross-section, etc., is the same along its entire length. Therefore, for example, at any of points A to C, each mobile conductor detection cylinder unit 11A to C can be attached to the pipe 102 using the structure described above. The pellets, which are the solids S that pass through, then move inside the internal piping 102a of each mobile conductive detection cylinder unit 11A to C in the manner described above.

[0048] For example, if pellets that are solids S stored in tank T contain pellets that are conductors to be detected E, the pellets that are low conductors I and the pellets that are conductors to be detected E are transported through piping 102 and pass through the mobile conductor detection cylinder unit 11 along the way. For example, suppose that the mobile conductor detection cylinder unit 11A is attached to location A and its mobile conductor detection coil 16 is energized. This mobile conductor detection coil 16 generates a first magnetic field. As a result, when the pellets pass through location A, the conductors to be detected E pass inside the mobile conductor detection coil 16 of the mobile conductor detection cylinder unit 11A, generating a second magnetic field in a direction that cancels out the first magnetic field. The mobile conductor detection system 101 then measures the fluctuation of the first magnetic field at this time using a detector T (not shown), and when the fluctuation of the first magnetic field exceeds a predetermined detection threshold, it determines that the solids S that passed through at that time are conductors to be detected E.

[0049] When the mobile conductor detection system 101 detects the passage of the conductor E to be detected, it can stop the airflow from the blower to prevent the conductor E to be detected from entering the molding machine M or from being mixed into the molded product formed by the molding machine M.

[0050] Furthermore, although not shown in the figures, the mobile conductor detection system 101 has an openable and closable outlet in the middle of the piping 102, and when it detects a conductor to be detected, it opens the outlet to discharge the conductor to be detected E, thereby preventing the conductor to be detected E from entering the molding machine M or from being mixed into the molded product formed by the molding machine M.

[0051] Figure 6 shows a schematic diagram of a case where a stand 106, for example, placed on the floor F, is used to support the mobile conductor detection cylinder unit 11 when attaching it to the pipe 102. The housing 14 of the mobile conductor detection cylinder unit 11 is fixed to this stand 106, preventing the mobile conductor detection cylinder unit 11 and the pipe 102 from sagging due to gravity.

[0052] With the above configuration, the moving conductor detection cylinder unit 11 comprises an outer cylinder portion 12 that can be mounted inward from the outside of the pipe 102, and a moving conductor detection coil 16 in which a conductor 15 is wound around the outer cylinder portion 12. Therefore, the moving conductor detection cylinder unit 11 does not need to be inserted between two pipes like the non-metallic pipes in conventional moving conductor detection systems, but can be mounted on the outside of a single pipe 102.

[0053] As a result, the mobile conductive detection system 101, which includes the mobile conductive detection cylinder unit 11, can use existing piping while maintaining its conventional layout, even when its placement is changed or increased or decreased. Only the placement of the mobile conductive detection cylinder unit 11, which is attached to the outside of the existing piping, needs to be moved. Therefore, large-scale construction work, such as changing the layout of the entire piping system, is not required.

[0054] Furthermore, in the mobile conductor detection system 11, the solid particles S, such as pellets, that move through the pipe 102 remain within the existing pipe 102 and do not come into contact with the outer cylinder portion 12 of the mobile conductor detection cylinder unit 11, nor do they remain inside it. As a result, when the mobile conductor detection cylinder unit 11 is removed from the pipe 102 for system maintenance or replacement, it is not necessary to clean the mobile conductor detection cylinder unit 11 to completely remove the solid particles S.

[0055] In this way, the movable conductive material detection cylinder unit 11 allows for easy changes to the factory layout. Furthermore, no material remains inside the pipe 102 as it moves through it.

[0056] Furthermore, since the inner surface 12a of the outer cylinder portion 12 of the moving conductor detection cylinder unit 11 is not worn down by the moving solid S, there is no need to use a special hard material such as ceramic. As a result, the outer cylinder portion 12 can be made of a synthetic resin such as polyacetal, and since such synthetic resins are relatively easy to procure, manufacturing costs can be reduced.

[0057] Furthermore, the mobile conductor detection coil 16, which has a conductor 15 wound around the outer cylinder 12, generates a magnetic field to detect the conductor E to be detected. The mobile conductor detection cylinder unit 11 minimizes the influence of external magnetic fields by confining the magnetic field generation area as much as possible inside the magnetically shielded housing 14. As a result, the mobile conductor detection cylinder unit 11 enables more accurate detection of the conductor E to be detected.

[0058] Furthermore, in the mobile conductor detection cylinder unit 11, multiple conductors 15 with different rotations, such as the first-turn conductor 15a, the second-turn conductor 15b, the third-turn conductor 15c, and the fourth-turn conductor 15d, are arranged in parallel in the direction of the center line C1 of the outer cylinder 12. This reduces the number of times the conductors 15 need to be overlapped when winding them away from the center line C1. In other words, the number of overlaps can be reduced to just two, as in the case of the first-turn conductor 15a to the fourth-turn conductor 15d. As a result, the overall distance from the center line C1 to the wound conductors 15 can be shortened. In addition, the mobile conductor detection cylinder unit 11 detects the conductor E to be detected by generating a magnetic field with the mobile conductor detection coil 16. By confining the range of magnetic field generation to a range as close to the center line C1 as possible, the influence of external magnetic fields can be suppressed. Therefore, the mobile conductor detection cylinder unit 11 enables more accurate detection of the conductor E to be detected.

[0059] Incidentally, it is known that solid objects S moving inside a synthetic resin pipe 102 tend to become electrostatically charged during movement. Furthermore, it is known that this tendency is particularly pronounced when the moving solid object S is a pellet of synthetic resin. When such solid objects S are electrostatically charged, sparks occur between the solid object S and the moving conductor detection coil 16, which tends to cause malfunctions when the moving conductor detection coil 16 detects the conductor to be detected E.

[0060] In response to this, the inventors discovered that when the distance between the moving solid S and the moving conductor detection coil 16 is increased, sparks are less likely to occur, even if the moving solid S is electrostatically charged. Furthermore, by creating a gap between the outer surface 102b of the pipe 102 and the inner surface 12a of the outer cylinder portion 12, the distance between the moving solid S moving inside the pipe 102 and the moving conductor detection coil 16 wound around the outer cylinder portion 12 can be increased, and as a result, the generation of sparks can be suppressed. Thus, the moving conductor detection system 101 enables more accurate detection of the conductor to be detected E.

[0061] In the example of the moving conductor detection system 101 according to this embodiment, there is a difference in diameter between the top 103a of the protrusion 103 and the bottom 104a of the recess 104 provided on the outer surface 102b of the spiral hose-like pipe 102. Therefore, even when the top 103a of the protrusion 103 abuts against the inner surface 12a of the cylindrical outer cylinder 12, this difference in diameter creates a gap 105, which allows the distance between the moving solid S moving inside the pipe and the moving conductor detection coil 16 wound around the outer cylinder 12 to be increased. As a result, it is possible to suppress the generation of sparks, and the moving conductor detection system 101 enables more accurate detection of the conductor to be detected E.

[0062] Furthermore, the mobile conductor detection system 101 allows the mobile conductor detection cylinder unit 11 to be easily mounted on the pipe 102, even if the pipe 102 is horizontal or oblique to the horizontal, by covering the pipe 102 with the outer cylinder 12, so that the center line C3 of the pipe and the center line C1 of the outer cylinder 12 or the central axis C2 of the mobile conductor detection coil 16 coincide. This is because the mobile conductor detection cylinder unit 11 comprises an outer cylinder 12 that is mounted inward from the outside of the pipe 102, and a mobile conductor detection coil 16 with a conductor 15 wound around the outer cylinder 12, and the structure allows the mobile conductor detection cylinder unit 11 to be mounted from the outside of the pipe 102.

[0063] [Examples] The inventor fabricated a prototype of the mobile conductor detection cylinder unit shown in Figure 2. The prototype mobile conductor detection cylinder unit is indicated by reference numeral 11t in Figures 7 and 8(a). Figure 7 shows a plan cross-sectional view similar to that of Figure 2, and Figure 8(a) shows a plan cross-sectional view similar to that of Figure 3(b). The outer cylinder, inner surface, through hole, housing, conductor, and mobile conductor detection coil of the prototype mobile conductor detection cylinder unit 11t are indicated by reference numerals 12t, 12at, 13t, 14t, 15t, and 16t, respectively. The inner surface 12at forms the inner circumferential surface of a cylinder, and its inner diameter is indicated by d1, which is the inner diameter of the outer cylinder. The outer cylinder 12t is made of polyacetal, and the inner diameter d1 of the outer cylinder was 50 mm.

[0064] Furthermore, as shown in Figure 8(a), an experimental pipe was passed through the through-hole 13t of the prototype mobile conductive detection cylinder unit 11t. Figure 8(b), like Figure 4(a), shows an enlarged plan cross-sectional view of Figure 8(a). The experimental pipe, the internal pipe of the unit, the convex portion, its top, the concave portion, its valley bottom, and the gap are indicated by reference numerals 102t, 102at, 103t, 103at, 104t, 104at, and 105t, respectively. The top portion 103at was in contact with the inner surface 12at. The inner circumferential surface of the pipe 102t, including the internal pipe 102at, has a circular cross-sectional shape, and its inner diameter is indicated by d2. The pipe 102t, including the internal pipe 102at, is made of polyvinyl chloride resin, and its inner diameter d2 was 38 mm. Therefore, the pipe thickness, which is 6 mm, is half the value obtained by subtracting the pipe inner diameter d2 from the inner diameter d1 of the outer cylinder, and is the thickness of the unit internal pipe 102at including the protrusion 103t. This pipe thickness is indicated by the symbol t. The pipe thickness t is the sum of the wall thickness, which is the radial distance from the inner circumferential surface of the unit internal pipe 102at to the valley bottom 104at, and the radial length of the gap 105t, which is the radial distance from the valley bottom 104at to the top 103at. Thus, in this moving conductor detection system, the pipe thickness t is larger due to the presence of the gap 105t.

[0065] The inventors conducted experiments using a mobile conductive detection cylinder unit 11t without such piping or a mobile conductive detection cylinder unit 11t with internal piping 102at, and synthetic resin pellets, under the conditions of Comparative Example 1, Comparative Example 2, and Example 1 described below. The experimental conditions and results for Comparative Example 1, Comparative Example 2, and Example 1 are shown in the table in Figure 9.

[0066] In Comparative Example 1, a mobile conductive detection cylinder unit 11t without piping, as shown in Figure 7, was prepared and placed in a position where the center line C1 of the outer cylinder 12t coincided with the vertical direction. Then, synthetic resin pellets were passed vertically downwards through the outer cylinder 12t by free fall. As the synthetic resin pellets, polypropylene pellets containing 10% glass beads and colored black with a masterbatch were used. These polypropylene pellets will be referred to as "PP pellets" below. In Comparative Example 1, no static electricity was applied to the PP pellets using the static electricity generating gun described below.

[0067] Although no static electricity was applied to the PP pellets using an electrostatic generator, they were charged with static electricity, and the residual voltage on the pellets was 2-3kV. The 16t coil for detecting the moving conductor output a voltage signal with a maximum RMS value (effective value) of 93mV.

[0068] The inventors understand that, including in Comparative Example 2 and Example 1 described below, a spark is generated between the pellet and the moving conductor detection coil 16t due to static electricity, and this spark induces high-frequency noise in the moving conductor detection coil 16t, causing the RMS value to increase. Therefore, the larger the maximum RMS value, the greater the degree of spark generation.

[0069] In Comparative Example 2, a mobile conductive detection cylinder unit 11t without piping, as shown in Figure 7, was prepared and placed in a position where the center line C1 of the outer cylinder 12t coincided with the vertical direction. Static electricity was applied to the PP pellet using an electrostatic discharge immunity tester ESS-200A and a discharge gun TC-815P manufactured by Noise Laboratory Co., Ltd., combined with static electricity generating gun. The output voltage at this time was 30kV. Then, the PP pellet was passed vertically downward through the outer cylinder 12t by free fall.

[0070] The PP pellets were electrostatically charged, and the residual voltage in the pellets was 15-20kV. The 16t coil for detecting the moving conductor output a voltage signal with a maximum RMS (effective value) average of 110mV. The three outputs were 109mV, 111mV, and 110mV, respectively.

[0071] From Comparative Examples 1 and 2, the inventors found that when synthetic resin pellets are charged with static electricity, the greater the static electricity, the greater the spark generated between the pellets and the moving conductor detection coil 16t.

[0072] In Example 1, a movable conductive material detection cylinder unit 11t was prepared, passing through the internal piping 102at as shown in Figures 8(a) and 8(b), and was placed in a position where the center line C1 of the outer cylinder 12t coincided with the vertical direction. Static electricity was applied to the PP pellet using an electrostatic discharge immunity tester ESS-200A and a discharge gun TC-815P manufactured by Noise Laboratory Co., Ltd., combined with an electrostatic discharge gun. The output voltage at this time was 30kV. Then, the PP pellet was passed vertically downward through the piping 102t by free fall.

[0073] The PP pellets were electrostatically charged, and the residual voltage on the pellets was 15-20kV. The 16t coil for detecting the moving conductor output a voltage signal with a maximum RMS (effective value) average of 32mV. The three outputs were 29mV, 36mV, and 30mV, respectively.

[0074] From Comparative Examples 1, 2, and 1, the inventors found that while a larger static charge on the PP pellets causes a larger spark to occur between the PP pellets and the moving conductor detection coil 16t, passing the internal unit piping 102at through the outer cylinder portion 12t suppresses the magnitude of the resulting spark. A gap 105t is created between the valley bottom 104at of the internal unit piping 102at and the inner surface 12at of the outer cylinder portion 12t. Due to this gap 105t, the pipe thickness t is larger, and the distance between the solid pellet moving inside the internal unit piping 102at and the moving conductor detection coil 16t is larger. As a result, the moving conductor detection system of Example 1 can suppress the generation of sparks, enabling more accurate detection of the conductor to be detected.

[0075] [Second Embodiment] A second embodiment of the present invention is illustrated with reference to Figures 10 to 12. In Figure 10, 21 is a mobile conductor detection cylinder unit, and 201 is a mobile conductor detection system. The mobile conductor detection system 201 comprises a pipe 202 and the mobile conductor detection cylinder unit 21. Figures 10(a) and (b) show a front view and a top view of the mobile conductor detection system 201 near the part to which the mobile conductor detection cylinder unit 21 is attached, respectively. In Figure 10(b), the portion of the pipe 202 shown by the hidden line is called the internal unit pipe 202a. The pipe 202 including the internal unit pipe 202a has a spiral convex portion 203 and a concave portion 204 on its outer surface 202b. Such a pipe 202 is known, for example, as a spiral hose.

[0076] The mobile conductor detection cylinder unit 21 has a pair of spacers 27 at the front and rear of the housing 24. Each spacer 27 is donut-shaped and has a common center line C4 with the center line C1 of the outer cylinder portion 22. The front spacer 27a is positioned next to the front surface 24a of the housing 24, and the rear spacer 27b is positioned next to the rear surface 24b. Each spacer 27a, 27b is made of, for example, synthetic resin.

[0077] The internal piping 202a of the unit refers to the piping 202 extending from the front surface of the front spacer 27a to the rear surface of the rear spacer 27b.

[0078] Figure 11 shows a plan cross-sectional view of the movable conductor detection cylinder unit 21 as seen from above, after it has been cut along the CC line shown in Figure 10(a). The movable conductor detection cylinder unit 21 includes an outer cylinder portion 22 which is cylindrical in the front-rear direction. The front and rear spacers 27a and 27b are fixed to the front 24a and rear 24b of the housing 24, respectively, at their rear and front surfaces. In this way, each spacer 27 is fixed to the housing 24. The inner surface 27c of the front spacer 27a and the inner surface 27d of the rear spacer 27b are both smaller in diameter than the inner surface 22a of the outer cylinder portion 22.

[0079] Figure 12 shows a plan cross-sectional view of the moving conductor detection system 201 as seen from above, after it has been cut along the CC line shown in Figure 10(a). In the moving conductor detection system 201, as shown in Figure 12, the top 203a of the protrusion 203 does not come into contact with the inner surface 22a of the outer cylinder 22. That is, the piping 202 and the moving conductor detection cylinder unit 21 are arranged so that there is a gap between the protrusion 203 and the inner surface 22a. Furthermore, there is a gap 205 between the outer surface 202b of the internal piping 202a and the inner surface 22a of the outer cylinder 22, and this gap 205 also extends radially outward from the top 203a.

[0080] On the other hand, the top portion 203a abuts against the inner surfaces 27c and 27d of the spacer 27. In this way, the movable conductor detection cylinder unit 21 has its up, down, left, and right positions relative to the internal piping 202a determined by the inner surface 27c of the front spacer 27a and the inner surface 27d of the rear spacer 27b abutting against the internal piping 202a radially inward. That is, the movable conductor detection cylinder unit 21 and the internal piping 202a are positioned such that the center line C3 of the internal piping 202a coincides with the center line C1 of the outer cylinder portion 22, the central axis C2 of the movable conductor detection coil 26, and the center line C4 of the spacer 27. Furthermore, a radially outward gap 205 of the internal piping 202a is always maintained, and this gap 205 also extends between the protrusion 203 and the inner surface 22a of the outer cylinder portion 22.

[0081] The other components are the same as those of the first embodiment.

[0082] With the above configuration, the moving conductor detection system 201 has radial protrusions 203 and recesses 204 on the outer surface 202b of the pipe 202, such as a spiral hose, and a gap is provided between the protrusions 203 and the inner surface 22a of the outer cylinder 22. Thus, in addition to the difference in diameter between the top 203a of the protrusions 203 and the bottom 204a of the recesses 204, a larger gap 205 is created because a gap is provided between the protrusions 203 and the inner surface 22a. This makes it possible to further increase the distance between the moving solid S moving inside the pipe 202 and the moving conductor detection coil 26 wound around the outer cylinder 12. As a result, it is possible to suppress the generation of sparks, and the moving conductor detection system 201 can detect the conductor to be detected more accurately.

[0083] [Third Embodiment] A third embodiment of the present invention is illustrated with reference to Figures 13 and 14. In Figure 13, 31 is a mobile conductor detection cylinder unit, and 301 is a mobile conductor detection system. The mobile conductor detection system 301 comprises a pipe 302 and the mobile conductor detection cylinder unit 31. Figures 13(a) and (b) show a front view and a top view of the mobile conductor detection system 301 near the part to which the mobile conductor detection cylinder unit 31 is attached, respectively. Of the pipe 302 shown in Figure 13(b), the portion represented by the hidden line is called the internal unit pipe 302a. The internal unit pipe 302a has an outer surface 302b that forms a cylindrical surface without irregularities. Its inner circumferential surface has a circular cross-sectional shape. The center line of the outer surface 302b of the internal unit pipe 302a is common with the center line C3 of the internal unit pipe 302a.

[0084] Figure 14 shows a plan cross-sectional view of the moving conductor detection system 301 as seen from above, after it has been cut along the DD line shown in Figure 13(a). The outer surface 302b of the internal piping 302a of the unit is in close contact with the inner surface 32a of the outer cylinder portion 32. Therefore, there is no gap between the internal piping 302a and the outer cylinder portion 32.

[0085] The other components are the same as those of the first embodiment.

[0086] With the above configuration, by increasing the radial thickness of the outer cylinder 32, the internal piping 302a, or both thereof, the distance between the conductor to be detected E and the coil 36 for detecting the moving conductor can be increased. This suppresses the generation of sparks and enables accurate detection of the conductor to be detected E.

[0087] [Fourth Embodiment] A fourth embodiment of the present invention is illustrated with reference to Figures 15 and 16. In Figure 15, 41 is a mobile conductor detection cylinder unit, and 401 is a mobile conductor detection system. The mobile conductor detection system 401 comprises a pipe 402 and a mobile conductor detection cylinder unit 41. Figures 15(a) and (b) show a front view and a top view of the mobile conductor detection system 401 near the part to which the mobile conductor detection cylinder unit 41 is attached, respectively. Of the pipe 402 shown in Figure 15(b), the portion represented by the hidden line is called the internal unit pipe 402a. The internal unit pipe 402a has an outer surface 402b that forms a cylindrical surface without irregularities. The center line of the outer surface 402b of the internal unit pipe 402a is common with the center line C3 of the internal unit pipe 402a.

[0088] The movable conductor detection cylinder unit 41 has a pair of spacers 47 at the front and rear of the housing 44. The front spacer 47a is positioned next to the front surface 44a of the housing 44, and the rear spacer 47b is positioned next to the rear surface 44b.

[0089] The internal piping 402a refers to the piping 402 extending from the front surface of the front spacer 47a to the rear surface of the rear spacer 47b.

[0090] Figure 16 shows a plan cross-sectional view of the moving conductor detection system 401 as seen from above, after it has been cut along the EE line shown in Figure 15(a). In the moving conductor detection system 401, the outer surface 402b of the internal piping 402a does not come into contact with the inner surface 42a of the outer cylinder portion 42. That is, the piping 402 and the moving conductor detection cylinder unit 41 are arranged such that there is a gap 405 between the internal piping 402a and the outer cylinder portion 42.

[0091] On the other hand, the inner surface 47c of the front spacer 47a and the inner surface 47d of the rear spacer 47b are both smaller in diameter than the inner surface 42a of the outer cylinder portion 42 and abut against the outer surface 402b of the internal unit piping 402a. In this way, the movable conductor detection cylinder unit 41 has its up, down, left, and right positions relative to the internal unit piping 402a determined by the contact between the inner surface 47c of the front spacer 47a and the inner surface 47d of the rear spacer 47b and the internal unit piping 402a in the radially inward direction. That is, the movable conductor detection cylinder unit 41 and the internal unit piping 402a are positioned such that the center line C3 of the internal unit piping 402a coincides with the center line C1 of the outer cylinder portion 42, the central axis C2 of the movable conductor detection coil 46, and the center line C4 of the spacer 47, while maintaining the gap 405. Furthermore, a gap 405 is always maintained between the internal piping 402a and the outer cylinder portion 42.

[0092] Other configurations are the same as those of the second and third embodiments.

[0093] With the above configuration, even when the outer surface 402b of the pipe 402 is a cylindrical surface, by providing a gap 405 between the outer surface 402b and the inner surface 42a of the outer cylinder portion 42, the distance between the moving solid S moving inside the pipe 402 and the moving conductor detection coil 46 wound around the outer cylinder portion 42 can be increased. As a result, the generation of sparks can be suppressed.

[0094] Although embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications are possible without departing from the spirit of the invention.

[0095] For example, the piping, including the piping inside the unit, is described as a spiral hose with a circular cross-sectional shape on its inner surface, or a cylindrical hose with no irregularities on its outer surface. However, it may have other shapes. For example, the piping may have a polygonal cross-sectional shape on its inner surface.

[0096] Furthermore, while examples were given where the outer cylinder is cylindrical to match a spiral hose with a circular cross-sectional shape on its inner surface or a cylindrical hose with no irregularities on its outer surface, if the piping has a shape other than these, the outer cylinder may have an inner surface that is substantially similar in shape to the outer surface of the piping.

[0097] Furthermore, although an example was given where the number of turns of the wire is four, the number of turns of the wire may be less than four or five or more in order to detect the conductor under optimal conditions.

[0098] Furthermore, while an example was given where the enclosure is roughly rectangular, the enclosure may have a shape other than a roughly rectangular parallelepiped, as long as it can suppress the influence of external magnetic fields. For example, it may have a shape other than a rectangular parallelepiped, such as a polygonal prism or a cylinder. [Industrial applicability]

[0099] The mobile conductor detection cylinder unit and mobile conductor detection system according to the present invention are used to detect conductive objects to be detected from solids such as synthetic resin pellets or other solid resins, chemicals, pharmaceuticals, and food products that move inside a pipe. [Explanation of Symbols]

[0100] 11,21,31,41,51 Mobile conductive material detection cylinder unit 12,22,32,42 Outer cylinder part 12a ,22a,32a,42a Inner surface 12b Outer surface 13 Through hole 14,24,44 cabinets 15 Conductor 16, 26, 36, 46 Coils for detecting moving conductors 27,47 Spacer 27c, 27d, 47c, 47d Inner surface of spacer 101,201,301,401,501 Mobile Conductor Detection System 102,202,302,402,502 Piping Piping within units 102a, 202a, 302a, 402a 102b,202b,302b,402b Outer surface 103, 203 convex parts 103a,203a Top 104,204 recesses 104a,204a Valley bottom 105, 205, 405 gap M molding machine T Tank

Claims

1. A mobile conductive object detection cylinder unit for detecting a conductive object to be detected, which is a conductive solid, from among multiple solids moving inside a portion of a synthetic resin pipe, It is cylindrical, with its inner surface forming the inner circumferential surface of a cylindrical body, and has an outer cylindrical portion that can be attached to a part of the piping inward in its radial direction, The system includes a mobile conductor detection coil, which has a wire wound around the outer cylinder and is a coil for detecting the conductor to be detected. A mobile conductive material detection cylinder unit characterized by the above.

2. The outer cylinder portion is made of synthetic resin. The mobile conductor detection cylinder unit according to claim 1.

3. It has magnetic shielding properties and includes a housing that covers the outer cylinder portion and the coil for detecting the moving conductor. The mobile conductor detection cylinder unit according to claim 1.

4. The coil for detecting the moving conductor has a conductor that is wound multiple times, and the conductor at the nth turn (where n is a natural number) and the conductor at a different turn are arranged in parallel in the direction of the center line of the outer cylinder. The movable conductive material detection cylinder unit according to claim 1.

5. A mobile conductor detection system comprising a piping made of synthetic resin and a mobile conductor detection cylinder unit that detects a conductor to be detected, which is a conductive solid, from among a plurality of solids moving inside a part of the piping, The mobile conductor detection cylinder unit is cylindrical and comprises an outer cylinder portion that can be mounted radially inward on a portion of the piping, and a mobile conductor detection coil which has a conductor wound around the outer cylinder portion and is a coil for detecting the conductor to be detected. A mobile conductor detection system characterized by the following features.

6. The piping and the outer cylinder are arranged such that there is a gap between a portion of the outer surface of the piping and the inner surface of the outer cylinder. The mobile conductor detection system according to claim 5, characterized in that it is a mobile conductor detection system.

7. The piping and the outer cylinder are arranged such that there is a gap between a part of the outer surface of the piping and the inner surface of the outer cylinder. The outer surface is a cylindrical surface having a common centerline with a part of the piping. The mobile conductor detection system according to claim 5, characterized in that it is a mobile conductor detection system.

8. A portion of the outer surface of the aforementioned pipe has a protrusion that is radially outward and a recess that is similarly concave inward. The piping and the outer cylinder are arranged such that the top of the protrusion abuts against the inner surface of the outer cylinder. The mobile conductor detection system according to claim 5, characterized in that it is a mobile conductor detection system.

9. A portion of the outer surface of the aforementioned pipe has a protrusion that is radially outward and a recess that is similarly concave inward. The piping and the outer cylinder are arranged such that there is a gap between the protrusion and the inner surface of the outer cylinder. The mobile conductor detection system according to claim 5, characterized in that it is a mobile conductor detection system.

10. The piping and the outer cylinder are arranged such that a portion of the outer surface of the piping and the inner surface of the outer cylinder are in close contact with each other. The mobile conductor detection system according to claim 5, characterized in that it is a mobile conductor detection system.

11. The moving conductor detection device is mounted on the piping such that the central axis of the moving conductor detection coil is horizontal, or inclined at an angle of less than 90° with respect to the horizontal. A moving conductor detection system according to any one of claims 5 to 10, characterized by the features described herein.

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