JP2008275450A - X-ray foreign matter detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a hygienic property by enabling easy removal of a belt of a conveyor to the outside of a case without creating a problem of X-ray leak, in an X-ray foreign matter detector of oblique irradiation type. <P>SOLUTION: A frame 2 of the X-ray foreign matter detector 1 comprises an upper case 3 having a conveyance space S, and a lower case 4 that is disposed under the conveyance space S and is mounted with a belt circulation-turnably. A clearance 5 along the conveyance direction of an object to be inspected is disposed between them. X-rays are radiated to the object to be inspected on the belt in the conveyance space while being directed from the front upside of the frame toward the back downside thereof. An openable/closable light shielding plate 15 is disposed in the clearance, and is constituted so as to interlock with a sideboard 20 of a side case for operating an interlock switch of X-rays, thereby preventing the leak of X-rays from the clearance 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an X-ray foreign object detection apparatus that detects foreign objects by irradiating X-rays from an oblique direction to an object to be inspected that is transported in a shielded housing by a transport means, and in particular, a transport belt of a transport means X-ray foreign object detection that is easy to remove from the front side of the case and therefore has excellent cleaning properties, and at the same time, there is no problem of X-ray leakage due to such structure, and also has safety. It relates to the device.

  An X-ray foreign object detection device described in Patent Document 1 below irradiates an object to be inspected conveyed by a conveyor in a shielded housing with X-rays vertically downward from directly above the conveyor in the housing. X-rays are detected by an X-ray detector provided below, and thereby foreign matter in the inspection object is detected. In this apparatus, the conveyor is provided through the casing, and the heavy X-ray generator is arranged at the upper center of the conveyor, so the overall balance is good and the apparatus is placed on the installation surface. The supporting legs to be supported are not provided on the front side of the housing, but are merely cantilevered on the rear side.

The X-ray foreign object detection apparatus described in Patent Document 2 below irradiates an object to be inspected conveyed by a conveyor in a shielded casing with X-rays obliquely downward from the upper side of the conveyor in the casing. The X-ray detector is provided obliquely below the conveyor to detect X-rays, thereby detecting foreign matter in the inspection object. Unlike the X-ray foreign object detection apparatus of Patent Document 1 that irradiates X-rays vertically downward, the X-ray foreign object detection apparatus of Patent Document 2 performs oblique X-ray irradiation for the following reason. That is, when the object to be inspected is a tall article, the sensitivity of foreign matter detection may be insufficient even when X-rays are irradiated from directly above by vertical irradiation, and X-rays are irradiated from the side. This is because the inspection accuracy of the bottom of the object to be inspected may be insufficient in the structure. In order to solve both of these problems, the object is inspected with X-rays from obliquely above, It is effective to employ a structure in which detection is performed by an X-ray detector disposed obliquely below the conveyor. Patent Document 2 discloses the principle of such oblique irradiation. However, an X-ray generator, an X-ray detector, a conveyor, and the like are housed in a shielding-structure housing, and the housing is stabilized on the ground plane. A specific structure as an X-ray foreign object detection device having a structure to be installed is not disclosed.
Japanese Patent No. 3828781 JP 2004-317184 A

  Therefore, an X-ray foreign object detection device that is effective for a tall object to be inspected and has a highly clean and safe configuration that is indispensable as a product from the viewpoint of practicality. A device was sought.

  In order to realize excellent cleaning properties, it is preferable to have a structure that allows the belt of the conveying means to be easily pulled out to the front side (front side) of the housing. Therefore, considering the basic structure of the oblique irradiation type X-ray foreign matter detection apparatus from such a viewpoint, the X-ray generator is provided at an upper position on the front side of the casing and is directed toward the conveying means obliquely below. There are no devices to be arranged in particular on the front side of the conveying means housed in the body, and it can be considered that an empty space can be used and a configuration can be used for removing the belt.

  However, the fact that the space on the front side of the conveying means is used as a work space for removing the belt naturally means that no housing or other components can be arranged in the front and lower spaces of the conveying means. When a gap for pulling the belt out of the casing is provided in the casing, it becomes a problem how to shield this gap during operation of the apparatus other than during cleaning.

  The X-ray generator is the heaviest item among the components of the X-ray foreign object detection device, and the oblique irradiation type X-ray foreign object detection device provided at the upper position on the front side of the housing has a weight balance. Is not good. In order to stably install this on the installation surface, the front side of the housing in which the X-ray generator is stored is supported by a pair of left and right support legs, and the rear of the housing is also supported by a pair of left and right support legs. A sufficiently stable support structure must be taken.

  That is, as described above, the oblique irradiation type X-ray foreign object detection device can secure a space for removing the belt on the front side of the conveying means accommodated in the casing, but supports the casing in front of it. Since it is necessary to provide a support leg for the book, it is difficult to take a configuration that makes it easy to remove the belt, and in addition to the above-mentioned cleanability and shielding properties, this point is also an oblique irradiation type X-ray foreign matter In order to realize the detection device as a practical product, it is considered to be an important issue.

  The present invention solves each of the above-mentioned problems recognized by the inventor in the course of research and development in concretely realizing the oblique irradiation type X-ray foreign matter detection apparatus as described above. In an oblique irradiation type X-ray foreign object detection device effective for high inspection objects, the belt of the conveyor can be easily removed from the housing to improve the cleaning property, and the belt can be easily removed. Nevertheless, an object of the present invention is to provide an X-ray foreign object detection device that is excellent in safety and does not cause the problem of X-ray leakage.

The X-ray foreign object detection device 1 according to claim 1 is:
An X-ray foreign object detection device that detects a foreign object contained in the inspection object by irradiating X-rays while conveying the inspection object,
An upper casing 3 having a transport space S communicated along the transport direction and surrounded by a rear portion 3a, a front portion 3b, and an upper portion 3c for transporting the inspection object, and the transport in the upper housing 3 Joined to the rear portion 3a of the section S and disposed below the transfer space S to constitute one surface of the transfer space S, and between the front portion 3b of the transfer space S in the upper housing 3 A frame 2 having a lower housing 4 that forms a gap 5 along the conveying direction;
An X-ray generator 10 that is housed in an upper portion of the front portion 3b of the transport space S in the upper housing 3 and emits X-rays toward the transport space S;
An X-ray detector 11 for detecting X-rays that are at least partially housed in the lower housing 4 and are disposed so as to face the X-ray generator 10 and pass through the transfer space S;
It is hung along the lower surface of the transport space S in the lower housing 4 and is driven to circulate in the transport direction of the inspection object, and the front portion 3b of the transport space S in the upper housing 3 and the lower portion A conveying means 12 having a belt 13 that is detachable via a gap 5 between the housing 4 and
A shielding plate 15 provided on the frame 2 so as to be openable and closable, and preventing X-ray leakage from the gap 5;
It is characterized by comprising.

The X-ray foreign object detection device 1 according to claim 2 is the X-ray foreign object detection device 1 according to claim 1,
The side housing 16 provided to shield the opening of the transfer space S communicated to the left and right of the frame 2 and the X only when the side housing 16 is properly attached to the frame 2 And a safety mechanism 17 that enables the wire generator 10 to operate,
The shielding plate 15 cannot be opened because the side case 16 is locked to the side case 16 with the gap 5 closed when the side case 16 is in a state of shielding the side surface of the transfer space S. When the side housing 16 is in a state that does not shield the side surface of the transfer space S, the gap 5 can be opened without being locked to the side housing 16.
The side housing 16 in a state where the side surface of the transport space S is not shielded is locked to the shielding plate 15 in an open state so that the side housing 16 cannot be mounted in a state of shielding the side surface of the transport space S. It is characterized by being composed.

The X-ray foreign object detection device 1 according to claim 3 is the X-ray foreign object detection device 1 according to claim 2,
In the vicinity of the gap 5, the shielding plate 15 is rotatably attached to the upper housing 3 at the upper edge portion, and a fixing means 18 is detachably secured to the upper housing 3 at the lower edge portion. When the gap 5 is shielded, the shielding plate 15 hangs downward to close the gap 5, and when the gap 5 is not shielded, the shielding plate 15 rotated upward is the fixing means 18. Thus, the gap 5 is opened by being fixed to the upper casing 3.

The X-ray foreign object detection device 1 according to claim 4 is the X-ray foreign object detection device 1 according to any one of claims 1 to 3,
The frame 2 is characterized in that the height of the upper surface 40 forming the transport space S in the lower housing 4 is lower than the height of the lower surface 41 of the front portion 3b of the transport space S in the upper housing 3. .

The X-ray foreign object detection device 1 according to claim 5 is the X-ray foreign object detection device 1 according to any one of claims 1 to 4,
It has a front support body 7 that supports the frame 2 in front of the gap 5 and a rear support body 8 that supports the frame 2 in the rear of the gap 5.

The X-ray foreign object detection device 1 according to claim 6 is the X-ray foreign object detection device 1 according to claim 5,
The distance between the front surface 42 of the lower housing 4 and the front support 7 is larger than the width of the belt 13.

  According to the X-ray foreign matter detection device 1 described in claim 1, the belt 13 of the transport unit 12 passes through the gap 5 between the upper housing 3 and the lower housing 4 (in front of the lower housing 4 (transport unit). 12), and can be attached to the lower housing 4 by the reverse operation after cleaning. When this apparatus is operated, the gap 5 is closed by the shielding plate 15, so that X-rays do not leak from the gap 5.

  According to the X-ray foreign object detection device 1 described in claim 2, when the side housing 16 shields the side surface of the transport space S and X-rays can be irradiated by the safety mechanism 17, the shielding plate 15. Since it cannot be moved by being locked to the side housing 16 with the gap 5 closed, it cannot be opened and is safe. Further, when the side housing 16 does not shield the side surface of the transport space S and the safety mechanism 17 cannot irradiate X-rays, the shielding plate 15 may be locked to the side housing 16. Therefore, the movement is not limited and the gap 5 can be opened, and the belt 13 can be removed forward from the gap 5 for cleaning. Further, in a state where the side housing 16 does not shield the side surface of the transport space S and the shielding plate 15 is also opened, the side housing 16 is attached to the side surface of the transport space S in a normal state and shielded. Even if it is attempted to irradiate X-rays by the mechanism 17, the side housing 16 cannot be mounted in a normal state where the shielding plate 15 in the open state obstructs the side surface of the transport space S, The safety mechanism 17 is not activated and no X-rays can be generated. That is, when the shielding plate 15 is left open, the side housing 16 cannot be attached to irradiate X-rays.

  According to the X-ray foreign object detection device 1 described in claim 3, the shielding plate 15 hangs downward when the device is used, closes the gap 5, and attaches / detaches the belt 13 for cleaning or the like. Sometimes it turns upward and is fixed to the frame 2 by the fixing means 18, and the gap 5 can be opened.

  According to the X-ray foreign object detection device 1 described in claim 4, the height of the upper surface 40 of the lower housing 4 is lower than the height of the lower surface 41 of the front portion 3 b of the upper housing 3. 12 belts 13 can be easily pulled out to the space in front of the lower housing 4 (in front of the conveying means 12) through the height difference of the gap 5, and after the cleaning, the belt 13 is moved back to the lower housing 4 by the reverse operation. Can be installed.

  According to the X-ray foreign object detection device 1 described in claim 5, the frame 2 is supported by the front support 7 in front of the gap 5 and supported by the rear support 8 in the rear of the gap 5. Therefore, the X-ray generator, which is a heavy object, can be stably installed on the installation surface even though the X-ray generator is arranged at the upper front portion of the frame.

  According to the X-ray foreign object detection device 1 described in claim 6, the distance between the front surface of the lower housing 4 of the frame 2 and the front support 7 is larger than the width of the belt 13. The belt 13 attached to 4 can be pulled forward from the gap 5 without being obstructed by the front support 7.

An example of an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of the X-ray foreign object detection device 1 of the present example in a normal state and when the side cover (side housing 16) is opened, and FIG. 2 is a frame 2 of the X-ray foreign object detection device 1 of the present example. FIG. 3 is a perspective view of the frame 2 of the X-ray foreign object detection device 1 of the present example as viewed from the rear, and FIG. 4 is a perspective view of the X-ray foreign object detection device 1 of the present example. FIG. 5 is a left side view of the frame 2, FIG. 5 is a right side view of the X-ray foreign matter detection apparatus 1 of the present example in which X-ray irradiation ranges are overlapped, and FIG. 6 is a belt of the conveying means 12 (conveyor). FIG. 7A is a plan view of the X-ray foreign object detection device 1 of the present example, showing a side cover (side housing 16) and a housing in the X-ray foreign object detection device 1 at the normal time of the present example. FIG. 7B is a perspective view showing the gap 5 and the shielding plate 15 through the body, FIG. 7B is a right side view of the vicinity of the shielding plate 15, and FIG. FIG. 8B is a perspective view showing the gap 5 and the shielding plate 15 through the side cover (side casing 16) and the casing in the X-ray foreign object detection device 1 when the belt 13 is attached / detached as an example. FIG. 9 is a right side view of the vicinity of the shielding plate 15. FIG. 9 shows the side cover (side housing 16) removed again in the X-ray foreign object detection device 1 of this example when the shielding plate 15 is opened. FIG. 6 is a perspective view showing the gap 5 and the shielding plate 15 through the side cover (side housing 16) and the housing in order to show that they cannot be attached.

First, an outline of the structure of the present apparatus will be described from the appearance of the X-ray foreign object detection apparatus 1 of this example shown in FIG.
This apparatus has a box-shaped frame 2 having a shielding structure for housing various devices such as an X-ray generator 10 described later as a main body of the apparatus. The frame 2 is provided with a conveyor 12 serving as a means for conveying the inspection object, penetrating the left and right side surfaces.

  A side housing 16 (side cover) that covers each opening of the frame 2 is provided at a portion that the conveyor 12 penetrates and protrudes out of the frame 2. The side housing 16 includes a pair of side plates 20 rotatably attached to the frame 2 via hinges, a shutter 22 having a double door structure provided on the side plate 20, and a pair of side plates 20 arranged in parallel to each other. , 20, and a removable top plate 21 that covers the top of the conveyor 12, and the upper surface of the conveyor 12 can be opened when the side cover is opened as shown in FIG. An interlock switch 17 is provided on the side surface of the frame 2 as a safety mechanism that enables an X-ray generator 10 to be described later. Then, when the side plate 20 and the top plate 21 are assembled into a normal box shape as a normal state as shown in FIG. 1, an operation member (not shown) provided on the top plate 21 turns the interlock switch 17 on. The device is operable and ready for X-ray irradiation.

  The entire apparatus is erected on a support floor surface by leg-shaped support portions 6, and the support portion 6 of this example includes a pair of front support bodies 7 provided on the front left and right sides of the frame 2, and It is constituted by a pair of rear support bodies 8 provided on the left and right sides of the frame 2, for a total of four.

Next, details of the structure of the X-ray foreign object detection device 1 of this example will be described for each part.
As shown in FIGS. 2 to 4, the frame 2 of the X-ray foreign object detection device 1 of this example is an integrally structured housing as a whole in this example, but is greatly enlarged vertically by a one-dot chain line shown in FIG. 4. As divided, it is composed of two parts, an upper housing 3 and a lower housing 4. The upper housing 3 is provided with a transport space S for an object to be inspected. The transport space S communicates the left and right side surfaces of the upper housing 3 and the lower surface is open. Hereinafter, when each part of the upper housing 3 is designated, the transport space S is used as a reference, and the rear portion 3a, the front portion 3b, the upper portion 3c, and the like of the transport space S are represented.

  The conveyance space S is a space in which an inspection object conveyed by the conveyor 12 moves and passes, and is also a place where X-rays irradiated from an X-ray generator 10 described later are irradiated to the inspection object. Note that both side surfaces of the upper housing 3 in which the conveyance space S is open have a structure in which X-rays are shielded by the side housing 16 as described above.

  As shown in FIGS. 1 and 5, two covers 25 and 26 are provided on the front side of the frame 2 so as to be openable and closable. If the upper cover 25 is opened, X-ray generation described later is performed. The container 10 can be accessed, and the conveyor 12 can be accessed by opening the lower cover 26.

  The lower housing 4 is configured to be integrally joined to the rear portion 3 a of the transport space S in the upper housing 3, and is a box-shaped portion disposed below the transport space S. As most clearly shown in FIG. 4, there is a gap between the upper surface 40 of the lower housing 4 and the front portion lower surface 41 of the front portion 3 b of the transport space S in the upper housing 3. A gap 5 is formed along the transport direction. In other words, the gap is generated because the height of the upper surface 40 of the lower housing 4 is set lower than the height of the lower surface 41 of the front portion 3b of the transport space S. At this time, the front surface 42 of the lower housing 4 is formed. Are dimensioned so as to be located slightly later than the transport space surface 43 of the front portion 3b of the transport space S in the upper housing 3.

  A conveyor 12 is attached to the lower housing 4 having the lateral gap 5 between the upper housing 3 and the upper housing 3 in order to transport the inspection object in the transport space S. Specifically, as shown in FIG. 1, a pair of substantially triangular support plates 30 are attached to both side surfaces of the lower housing 4 directly below the conveyance space S to support the rollers 31. The belt 13 is wound along the upper and lower surfaces of the lower housing 4 and is circulated and driven by a motor (not shown).

  According to the above configuration, the gap 5 can be used as a clearance for attaching and detaching the belt 13 of the conveyor 12, and the belt 13 is a frame below the front portion 3 b of the transport space S in the upper housing 3. 2 can be attached and detached through a gap 5 between the space outside 2 and the periphery of the lower housing 4.

  As shown in FIGS. 5 and 6, in the upper housing 3 of the frame 2, an X-ray generator 10 is accommodated in the upper portion of the front portion 3 b of the transfer space S. The X-ray generator 10 is installed so as to irradiate the X-rays in a plane toward the transport space S that is obliquely below and rearward when viewed from the installation position. In FIG. 5, a hatched triangular area A indicates an X-ray planar irradiation area.

  As shown in FIGS. 5 and 6, an X-ray detector 11 is provided across the inside of the conveyor 12 in the lower housing 4 of the frame 2 and the rear portion of the transport space S of the upper housing 3. Yes. The X-ray detector 11 has a sensor group arranged linearly so as to be parallel to the planar X-ray irradiated from the X-ray detector 11, and is obliquely forward when viewed from the installation position. It is installed in an oblique posture so as to be perpendicular to the central portion C of the X-ray irradiated from the X-ray generator 10 located above.

  Therefore, as can be seen from the X-ray irradiation range A shown in FIG. 5, the X-rays that have passed through the inspection object carried on the belt 13 of the conveyor 12 are transmitted through the conveyor 12 or X as they are. The line detector 11 is reached. The sensor group of the X-ray detector 11 outputs a voltage waveform signal proportional to the X-ray dose distribution reached, and this signal is processed by a control circuit (not shown) to determine whether there is a foreign object in the inspection object. Is judged.

Next, with reference to FIG. 7 thru | or FIG. 9, the structure and effect of the shielding board 15 provided in order to shield the said clearance gap 5 are demonstrated.
The shielding plate 15 is an elongated bar plate-like member having a shape and area wider than the opening area of the gap 5, and the upper edge portion in the vicinity of the gap 5 is the upper casing 3 (conveyance) of the frame 2. A front part of the space S) is pivotally attached with a hinge, and as shown in FIG. 7, when the gap 5 is shielded, a shielding plate 15 hanging downward is configured to close the gap 5. Yes. Further, a magnet 18 as a fixing means is attached to the center of the front surface of the lower edge portion of the shielding plate 15, and the shielding plate 15 rotated upward when the gap 5 is not shielded as shown in FIG. By adhering to the lower surface of the upper casing 3 (the lower surface of the front portion of the conveyance space S), the gap 5 can be kept open.

  In particular, as shown in FIGS. 7 to 8, locking pieces 35 are provided at both ends of the shielding plate 15 so as to protrude laterally from the side surface of the frame 2. The shielding plate 15 has an interlocking relationship with the side casing 16 (side plate 20) and the interlock switch 17 through the locking piece 35.

  First, as shown in FIG. 7, the shielding plate 15 hangs down and shields the gap 5, and the side plate 20 of the side housing 16 and the top plate 21 (not shown) are also properly attached to the transfer space. Consider a case in which the side surface of S is in a normal wearing state where the side surface is shielded. At this time, since the interlock switch 17 is ON, the X-ray generator 10 can be operated. However, as shown in the enlarged side view of the figure, the shielding plate 15 in the state where the gap 5 is closed is The locking piece 35 is pressed by the side plate 20 of the side housing 16 and cannot be opened. Accordingly, it is impossible for the mechanism to open only the shielding plate 15 in this state, and X-rays cannot leak from the opened gap 5 while the present apparatus is being driven.

  Therefore, as shown in FIG. 8, in order to open the shielding plate 15 and open the gap 5 in order to remove the belt 13, etc., the top plate 21 (not shown) and the side plate 20 are also opened, and the interlock switch 17 is opened. Is set to OFF to make the X-ray generator 10 inoperable. If the side plate 20 is rotated approximately 90 degrees and opened to a position where it is substantially in contact with the side surface of the upper housing 3, there is no other member that holds down the locking piece 35 of the shielding plate 15. As described above, the shielding plate 15 can be rotated upward without being obstructed by the side plate 20 of the side housing 16, and is fixed to the lower surface of the upper housing 3 by the magnet 18 to open the gap 5. Is possible. In this way, the belt 13 can be attached and detached through the gap 5 in a safe state where the interlock switch 17 is OFF and X-rays cannot be irradiated.

  Further, as shown in FIG. 9, the side housing 16 (the side plate 20 and the top plate 21 not shown) is not properly attached to the side surface of the frame 2, and the shielding plate 15 also opens the gap 5. In this case, it is impossible to mount the side plate 20 of the side housing 16 with the shielding plate 15 left as it is and with the gap 5 left open. That is, even if the side plate 20 is returned to the normal position and the top plate 21 (not shown) is attached to enable X-ray irradiation, the locking piece 35 of the shielding plate 15 at the position where the gap 5 is opened is 3 protrudes outward from the upper housing 3 in the vicinity of the lower surface of 3, so that the side plate 20 trying to return to the normal position is obstructed and the side plate 20 is not allowed to be set to the normal mounting position. Therefore, the top plate 21 cannot be mounted, and the interlock switch 17 cannot be turned on to obtain a state where X-ray irradiation is possible. In this way, when the side housing 16 is removed and the shielding plate 15 is set to the open position and the gap 5 is opened, the side housing is not moved unless the shielding plate 15 fixed by the magnet 18 is moved to shield the gap 5. It is safe because the body 16 cannot be worn to enable X-ray irradiation.

  As described above, according to the apparatus of the present example, the belt 13 circulated and driven along the upper surface and the lower surface of the lower housing 4 is pulled forward through the gap 5 and below the upper housing 3. Since it can be pulled out into a certain space, it is very convenient in terms of cleaning of the belt 13 and other maintenance work.

  Here, as shown in FIG. 5, in the space in front of the lower housing 4 from which the belt 13 is drawn, there are two front support bodies 7 attached to the lower surface of the upper housing 3. When pulling out the belt 13 forward and attaching the belt 13 from the front, the work is difficult if the distance W between the front support 7 and the front surface of the lower housing 4 is smaller than the width of the belt 13. However, in the apparatus of the oblique irradiation method in which the heavy X-ray generator 10 is located in front of the frame 2, it is structurally avoided that the two front support members 7 are disposed on the most front side of the frame 2. I can't. Therefore, in this example, since the interval W between the front surface of the lower housing 4 and the front support 7 is set to be larger than the width of the belt 13, the above operation can be performed without any trouble.

FIG. 1 is a perspective view of the X-ray foreign object detection device 1 of the present example at the normal time and when the side cover (side housing 16) is opened. FIG. 2 is a perspective view of the frame 2 of the X-ray foreign object detection device 1 of this example as viewed from the front. FIG. 3 is a perspective view of the frame 2 of the X-ray foreign object detection device 1 of this example as viewed from the rear. FIG. 4 is a left side view of the frame 2 of the X-ray foreign object detection device 1 of this example. FIG. 5 is a right side view of the X-ray foreign object detection device 1 of the present example showing the X-ray irradiation ranges in an overlapping manner. FIG. 6 is a plan view of the X-ray foreign matter detection apparatus 1 of the present example showing the belt 13 of the conveying means 12 (conveyor 12). FIG. 7A is a perspective view showing the gap 5 and the shielding plate 15 through the side cover (side housing 16) and the housing in the normal X-ray foreign object detection device 1 of this example. FIG. 7B is a right side view of the vicinity of the shielding plate 15. FIG. 8A is a perspective view showing the gap 5 and the shielding plate 15 through the side cover (side housing 16) and the housing in the X-ray foreign object detection device 1 when the belt 13 is attached / detached in this example. FIG. 8B is a right side view of the vicinity of the shielding plate 15. FIG. 9 shows a side cover in order to show that the removed side cover (side housing 16) cannot be mounted again when the shielding plate 15 is opened in the X-ray foreign object detection device 1 of this example. It is the perspective view which showed the clearance gap 5 and the shielding board 15 by seeing through the (side housing | casing 16) and a housing | casing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... X-ray foreign material detection apparatus 2 ... Frame 3 ... Upper housing | casing 3a ... Back part of upper housing | casing 3b ... Front part of upper housing | casing 3c ... Upper part of upper housing | casing 4 ... Lower housing | casing 5 ... Gap 6 ... Support Part 7: Front support 8 ... Rear support 10 ... X-ray generator 11 ... X-ray detector 12 ... Conveyor 13 as conveyor means 13 ... Belt 15 ... Shield plate 16 ... Side housing 17 ... As safety mechanism Interlock switch 18 ... Magnet as fixing means 20 ... Side plate constituting side housing 21 ... Top plate constituting side housing 22 ... Shutter constituting side housing 35 ... Locking piece of shielding plate 40 ... Upper surface of lower housing 41 ... Lower surface of front portion of upper housing 42 ... Front surface of lower housing S ... Transport space

Claims (6)

An X-ray foreign object detection device that detects a foreign object contained in the inspection object by irradiating X-rays while conveying the inspection object,
An upper housing (3) having a transfer space (S) that is communicated along the transfer direction and is surrounded by a rear part (3a), a front part (3b), and an upper part (3c) for transferring the inspection object. And a portion of the upper housing that is joined to a rear portion of the transport section and disposed below the transport space to constitute one surface of the transport space, and a front portion of the transport space in the upper housing. A frame (2) having a lower housing (4) forming a gap (5) along the conveying direction therebetween,
An X-ray generator (10) that is housed in an upper portion of the front portion of the transport space in the upper housing and emits X-rays toward the transport space;
An X-ray detector (11) for detecting X-rays that are at least partially housed in the lower housing and are arranged to face the X-ray generator and pass through the conveyance space;
It is hung along the lower surface of the transport space in the lower housing and is driven to circulate in the transport direction of the inspection object, and between the front portion of the transport space in the upper housing and the lower housing. A conveying means (12) having a belt (13) detachable through a gap in
A shielding plate (15) provided in the frame so as to be openable and closable, and preventing X-ray leakage from the gap;
An X-ray foreign object detection device (1) comprising: A side housing (16) provided to shield the opening of the transport space (S) communicated with the left and right of the frame (2), and the side housing is properly attached to the frame And a safety mechanism (17) that enables the X-ray generator (10) only when
The shielding plate (15) is not opened because the side housing is locked to the side housing with the gap (5) closed when the side housing is in a state of shielding the side surface of the transport space. It becomes possible, and when the side housing is in a state where it does not shield the side surface of the transport space, it is possible to be in a state of opening the gap without being locked to the side housing,
The side housing that is in a state that does not shield the side surface of the transport space is configured so as not to be mounted in a state that shields the side surface of the transport space because it is locked to the shielding plate in an open state. The X-ray foreign object detection device (1) according to claim 1, characterized in that: The shielding plate (15) is pivotally attached to the upper housing (3) in the vicinity of the gap (5), and removably fixed to the upper housing on the lower edge. When the gap is shielded, the shielding plate hangs downward to close the gap, and when the gap is not shielded, the shielding plate rotated upward is fixed. The X-ray foreign matter detection device (1) according to claim 2, wherein the gap is opened by being fixed to the upper housing by means. The frame (2) has an upper surface that forms the transport space in the lower housing (4) from the height of the lower surface (41) of the front portion (3b) of the transport space (S) in the upper housing (3). The X-ray foreign object detection device (1) according to any one of claims 1 to 3, wherein the height of (40) is low. The front support (7) that supports the frame (2) in front of the gap (5) and the rear support (8) that supports the frame in the rear of the gap. The X-ray foreign material detection device (1) according to any one of 1 to 4. X-ray according to claim 5, characterized in that the distance between the front surface (42) of the lower housing (4) and the front support (7) is larger than the width of the belt (13). Foreign object detection device (1).

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