JP2001318061A - X-ray foreign matter detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily changed the machine length according to line arrangement or the like, preventing leak of an X-ray simultaneously. SOLUTION: The conveyance length of a conveyance part 3 is determined by the length obtained by adding together a metal box 6, a front part roller support part 11 and a rear part roller support part 12, mountable and detachable respectively on the front and rear positions in the conveyance direction of the metal box 6,. When the machine length is to be changed, only changing support members 11b, 11e, 12b, 12c of the front part roller support part 11 and the rear part roller support part 12 to other members having the lengths in the conveyance direction fit for the machine length, mounting them on the metal box 6, and replacement of a conveyance belt 10 are required. The metal box 6 stores an X-ray detection part 2 tightly and is mounted on a casing 5 in the state where the leak of the X-ray is prevented, therefore, even when the machine length is to be changed, replacement of the X-ray detection part 2 is not required, and the machine length can be changed by replacement of minimum parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray foreign matter detecting apparatus for detecting foreign matter inside a test object while transferring the same, and more particularly to an X-ray foreign matter detecting apparatus capable of easily changing a transport length.

[0002]

FIG. 6 is a front view showing a conventional X-ray foreign matter detecting device. The X-ray foreign matter detection device 50 arranges a conveyor 51 for transporting the inspection object at the center, irradiates the inspection object with X-rays from the X-ray generation unit 52, and converts the X-rays transmitted through the inspection object into X-rays. The detection unit 53 detects the foreign matter in the inspection object. The X-ray foreign matter detection device 50 is provided with a cover 55 made of a metal material for X-ray shielding that covers the entire length of the conveyor 51 so that the X-rays emitted from the X-ray generator 52 do not leak outside. Have been.

[0003] The X-ray foreign matter detection device 50 described above is sometimes used in place of a conventionally used metal foreign matter detection device. Various foreign substances (bone, wood, synthetic resin, etc.) can be detected. For example, the foreign object detection device
The apparatus 50 is disposed at an intermediate position of a production line in which a packaging machine is provided in a former stage and a sorting machine is provided in a latter stage, and the machine length of the device 50 (the transport length of the conveyor 51) is a predetermined length for connecting the front and rear devices.

[0004]

The above-mentioned line is used when the arrangement position of the front and rear stage devices is changed, when the X-ray foreign matter detecting device 50 is arranged in place of the metallic foreign matter detecting device as described above, or when other models are used. When replacing with the X-ray foreign matter detector 50 of
In the above, it is necessary to adapt the length of the newly arranged X-ray foreign matter detection device 50 to the distance between the preceding and subsequent devices. However, the conventional X-ray foreign matter detection device 50 could not be easily installed because the machine length (conveyance length of the conveyor 51) was fixed. For example, when the length of the new device 50 is short, the inspection object cannot be transferred between the upstream and downstream devices. On the other hand, if the length of the new device 50 is long, it cannot be installed between the upstream and downstream devices. The conventional X-ray foreign matter detection device includes a fixed conveyance length of the conveyor 51 and a fixed length cover 55 adapted to the conveyance length of the conveyor 51 and preventing leakage of X-rays.
The cover 55 is a part of the housing and has only the length of the captain,
The captain could not be easily changed.

As described above, the conventional X-ray foreign matter detector 5
For 0, the captain could not be changed easily. Accordingly, in order to obtain a device that matches the required captain on the line, the cost and cost are reduced by replacing the entire device with the device 50 that matches the necessary captain or creating a device 50 that has a specially required captain. It took time. On the other hand, when the front and rear devices of the X-ray foreign matter detection device 50 are exchanged or the arrangement position is changed, the length of the installed device 50 cannot be easily changed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an X-ray foreign matter detecting device capable of easily changing the length of a machine in accordance with the arrangement of lines while preventing leakage of X-rays. It is intended to provide.

[0007]

In order to achieve the above object, an X-ray foreign matter detection apparatus according to the present invention is configured such that the X-ray inspection apparatus performs the inspection while transporting the X-ray foreign substance in a transport unit having a predetermined transport length. X that irradiates an object with X-rays and detects foreign matter inside
In the X-ray foreign matter detection device, an X-ray detection unit that detects X-rays transmitted through the inspection object is housed in a sealed state, and a metal box fixed to an apparatus housing, and A roller support that is detachable at each of the front and rear positions of the box, a plurality of rollers detachably supported by the roller support, and being stretched between the rollers,
And a transport belt passing through the upper and lower surfaces of the metal box, by attaching the roller support portions corresponding to a desired transport length at front and rear positions of the metal box, and by attaching a transport belt of the corresponding transport length together. The transfer length of the transfer section is variable.

Further, as in the second aspect, the housing may have a length corresponding to the transport length of the transport unit and a cover for preventing leakage of X-rays.

According to a third aspect of the present invention, the metal box and the roller support portion may be provided with an engagement portion for engaging and disengaging each other at a joint surface between the metal box and the roller support portion.

According to a fourth aspect of the present invention, a drive roller unit for transporting the transport belt is detachably provided on the roller support portion, and the drive roller units are provided at both ends of the drive roller. A configuration having a pair of bearing portions and a fixed shaft provided in parallel with the drive roller and fixed to the pair of bearing portions, respectively, may be employed.

According to a fifth aspect of the present invention, a driving force of a motor is transmitted to one end of a rotating shaft of the driving roller.
A configuration in which a detachable connecting portion is provided can also be adopted.

According to the above configuration, the metal box houses the X-ray detecting section in a sealed state, and the casing is fixed to the apparatus casing. Roller supporting portions for supporting the rollers can be detachably attached to the metal box at front and rear positions in the transport direction.
The transport belt stretched over each roller passes through the upper and lower surfaces of the metal box and transports the inspection object on the X-ray detection unit. Therefore, when changing the machine length, the roller support portions corresponding to the desired conveyance length are attached to the front and rear positions of the metal box, respectively. Then, it is only necessary to attach a transport belt of a corresponding transport length.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a perspective view showing an example of the X-ray foreign matter detection device of the present invention, FIG. 2 is a perspective view showing an X-ray detection unit in the device, and FIG. 3 is an exploded perspective view of the X-ray detection unit.

[0014] As shown in FIG.
X-ray generation unit 1 that mainly generates X-rays, X-ray detection unit 2 that receives X-rays from X-ray generation unit 1, and X-ray generation unit 1
A transport unit 3 for transporting an inspection object (not shown) between the line detection units 2;

An X-ray generator 1 includes an X-ray tube 4 for generating X-rays.
Is covered with a shielding plate to prevent leakage of X-rays. The shielding plate is formed by internally applying a shielding material such as lead. The X-ray generation unit 1 is disposed on an upper portion of a housing 5 that forms a main body of the X-ray foreign matter detection device, and emits X-rays downward. The X-rays are emitted in a substantially conical shape spreading downward from the X-ray tube 4, and thereafter, a long hole formed at the bottom of the X-ray generation unit 1 and the housing 5 supporting the X-ray generation unit 1 are provided. Through a long hole provided in the bottom plate, as shown by a chain line in FIG.

The X-ray detecting section 2 is arranged below the housing 5 forming the main body of the X-ray foreign matter detecting device, and is configured to receive the X-rays emitted from the X-ray generating section 1. This X
The line detector 2 is housed in a metal box 6. Metal box 6
Has a slit 7 on the upper surface 6a formed substantially flat. The slit 7 is formed by attaching a resin material that transmits X-rays to a long hole formed so as to extend in the lateral direction of the upper surface 6a and waterproofed with a silicon material or the like. This slit 7
Transmits the planar X-rays emitted from the X-ray generation unit 1. That is, the lateral direction in which the slit 7 is formed is a direction through which a planar X-ray can pass. X through slit 7 in metal box 6
The X-ray is received by the X-ray detector 2 arranged in the metal box 6.
The X-ray detector 2 converts the X-rays into light and outputs the light to an X-ray processor (not shown).

The lateral side of the metal box 6 is fixed to the case 5 which forms the main body of the X-ray foreign matter detection device. In the present embodiment, the metal box 6 is fixed by welding.
Other than welding, bolting or the like may be used. Further, the metal box 6 may be placed on a plane with the legs 34 attached thereto as described later.

The transport section 3 transports the inspection object with a predetermined transport length. During the transport, the object to be inspected is passed through planar X-rays emitted from the X-ray generator 1 to the X-ray detector 2. As shown in FIG. 1, the transport length of the transport unit 3 (the machine length of the X-ray detection device) is longer than the width of the housing 5, and the transport unit 3 protrudes from the housing 5 in the transport direction. The transport unit 3 mainly includes a roller 8, a motor unit 9,
And a conveyor belt 10. Further, as shown in FIGS. 2 and 3, the roller 8 and the transport belt 1 constituting the transport unit 3 are provided.
Numeral 0 is attached to the metal box 6 in which the X-ray detector 2 is arranged.

As shown in FIG. 2, a slit 7 is provided in the upper surface 6a of the metal box 6 in a horizontal direction, and a direction perpendicular to the slit 7 is a vertical direction, and the metal boxes 6 located before and after the vertical direction are provided. A front roller supporting portion 11 and a rear roller supporting portion 12 are provided on the front surface 6b and the rear surface 6c.

As shown in FIG. 3, the front roller supporting portion 11 includes a fixed plate 11a, and a pair of supporting members 11b and 11c which are bent on both sides of the fixed plate 11a and extend in parallel.
It is composed of a supporting plate 11d which also bends and extends above the fixing plate 11a. Further, the front roller support 1
1 includes a side plate 13 having a different configuration from the fixing plate 11a, the support members 11b and 11c, and the support plate 11d.

The fixing plate 11a is provided with a plurality (four) of Dharma-shaped holes 15 having a continuous small diameter and large diameter. On the other hand, the front surface 6b of the metal box 6 is provided with a collar that engages with the small diameter of the Dharma-shaped hole 15 of the fixing plate 11a, and a locking portion 16 that includes a bolt and a washer that is inserted into the large diameter. . In other words, the fixing plate 11a engages with the locking portion 1
6 is hooked on the front surface 6b of the metal box 6 by passing through the bolt and washer 6 and engaging with the collar of the locking portion 16. As a result, the front roller support 11
Is detachably mounted on the front surface 6 b of the metal box 6.

The side plate 13 is, as shown in FIG.
And the support member 11c. The side plate 13 is provided with a plurality (two) of Dharma-shaped holes 15 having a continuous small diameter and large diameter. On the other hand, on the side surface 6d of the metal box 6 and on the support member 11c, a locking portion 16 composed of a collar that engages with the small diameter of each Dharma-shaped hole 15 of the side plate 13 and a bolt and washer that penetrates the large diameter. Is provided. That is, the side plate 13 allows the darma-shaped hole 15 to pass through the bolt and the washer of the locking portion 16 and the locking portion 16
6d, the side surface 6d of the metal box 6
And the support member 11c. The side plate 13
Can be configured to be attached only to the support member 11c. In this case, the length of the support member 11c in the transport direction may be adjusted to the length of the side plate 13, and the two locking portions 16 are provided on the support member 11c side, and the two The mold hole 15 may be provided.

The side plate 13 has a side surface 6 d of the metal box 6.
Is provided with a fixture 18, such as a catch clip, which engages with a hook 17 provided on the base. When the side plate 13 is installed on the side surface 6d of the metal box 6 and the support member 11c,
The hook 17 is exposed from an opening 19 in the side plate 13.
The fixing tool 18 is engaged with the exposed hook 17. By engaging the fixture 18 with the hook 17,
The side plate 13 slides so that the small diameter of the Dharma-shaped hole 15 engages with the collar of the locking portion 16. Also, by removing the fixture 18 from the engagement of the hook 17 and removing the Dharma-shaped hole 15 from the bolt and the washer of the locking portion 16, it is possible to easily remove it from the side surface 6 d of the metal box 6. Thereby, the side plate 13 constituting the front roller support portion 11 is formed.
Are detachably mounted on the side surface 6d of the metal box 6 and the support member 11c so as to extend from the front surface 6b of the metal box 6 in parallel with the support member 11b.

As shown in FIG. 3, the rear roller supporting portion 12 includes a fixing plate 12a, a pair of supporting members 12b and 12c which are bent at both sides of the fixing plate 12a and extend in parallel with each other.
It is composed of a support plate 12d which also bends and extends above the fixed plate 12a.

The fixing plate 12a is provided with a plurality (four) of darma-shaped holes 15 having a continuous small diameter and large diameter. On the other hand, the rear surface 6c of the metal box 6 is provided with a collar that engages with the small diameter of the Dharma-shaped hole 15 of the fixing plate 12a, and a locking portion 16 that includes a bolt and a washer that is inserted into the large diameter. . In other words, the fixing plate 12a engages the locking portion 1
6 by being passed through the bolt and washer 6 and engaging the collar of the locking portion 16, the metal box 6 is hooked on the rear surface 6 c. Thereby, the rear roller support portion 12
However, the support members 12 b and 12 c are detachably installed on the rear surface 6 c of the metal box 6 so as to extend from the rear surface 6 c of the metal box 6.

The support plates 11d and 12d provided on the front roller support portion 11 and the rear roller support portion 12 are:
When the front roller support 11 and the rear roller support 12 are fixed to the metal box 6, they are flush with the upper surface 6 a of the metal box 6.

The roller 8 is supported by the front roller support 11 and the rear roller support 12 fixed to the metal box 6 as described above. As shown in FIGS. 2 and 3, the roller 8 is
A total of four rollers are provided, of which three rollers 8a, 8b, 8c form a driven roller, and the remaining one roller 8d forms a driving roller. Rollers 8a, 8b, 8c as driven rollers
Is rotatable around a roller shaft 20 protruding at both ends via a built-in bearing (not shown). The roller 8d serving as a driving roller is rotatable by rotating shafts 21 protruding from both ends thereof being supported by bearings 22 each containing a bearing (not shown). Each bearing portion 22 is fixed to a fixed shaft 23 by screws. The one bearing portion 22 forms a cylindrical connecting portion 24 that exposes the end of the rotating shaft 21. One end of a male / female coupling 25 that is connected to an output shaft side of the motor unit 9 described below is fixed to an end of the exposed rotating shaft 21. The drive roller 8d, the bearing portion 22, the fixed shaft 23, the connecting portion 24, and the coupling 25 constitute an integrated drive roller unit 8U.

The roller 8a (driven roller) and the roller 8b (driven roller) of the roller 8 constitute a front roller, and the support member 11b of the front roller support 11 and the side plate 1
3 and supported. A notch 26 is formed at the upper edge of the support member 11 b and the side plate 13. Roller 8a
Is supported between the support member 11b and the side plate 13 by inserting the roller shaft 20 through the notch 26. Also,
A notch 27 is formed in the lower edge of the support member 11b and the side plate 13.
Are formed. The roller 8b is connected to the support member 11b and the side plate 1 by inserting the roller shaft 20 through the notch 27.
3 and supported.

The roller 8a and the roller 8b
The roller shaft 20 can be easily removed by removing the roller shaft 20 from 6, 27. Thus, the rollers 8a, 8b
Is detachable from the front roller support 11.

Further, among the rollers 8, the roller 8c
(The driven roller) and the roller 8d (the driving roller) constitute a rear roller, and the supporting member 12b of the rear roller supporting portion 12
And the supporting member 12c. Support member 12
A cutout portion 28 is formed on the lower edge of b, 12c. The roller 8c is supported between the support member 12b and the support member 12c by inserting the roller shaft 20 through the cutout 28.

The roller 8c is connected to the roller shaft 2 from the notch 28.
It can be easily removed by removing 0.
In this manner, the roller 8c is detachable from the rear roller support portion 12.

On the upper edges of the support members 12b and 12c, a support portion 29 for supporting the bearing portion 22 of the roller 8d (drive roller) and the end of the fixed shaft 23 is formed. The support portion 29 may be formed so that both end portions of each bearing portion 22 and the fixed shaft 23 are placed, but at least the fixed shaft 23 on the opposite side of the connecting portion 24 in the support member 12c.
May be formed as a support concave portion 29a for positioning and mounting one end of the support recess 29a. Further, the support member 12c is provided with a fixture 30 such as a catch clip for locking and fixing one end of the fixed shaft 23 placed on the support recess 29a. The roller 8d is connected to one end of the fixed shaft 23 by the support recess 2.
9a, and the same end is fixed to the fixture 30, so that the support members 12b and 12c are fixed.
Supported between.

The roller 8d is fixed to the fixed shaft 2 by the fixture 30.
3 and release the end of the rotating shaft 21 to the motor unit 9.
Can be easily removed by disconnecting it from the output shaft side. In this way, the roller 8d is detachable from the rear roller support portion 12.

Each roller 8 (8a, 8a) supported by the front roller support 11 and the rear roller support 12 as described above.
b, 8c, 8d) are supported in a parallel relationship. In the rollers 8a and 8b (front rollers) supported by the front roller support portion 11, the upper roller 8a is located on the front side, and the lower roller 8b is located on the rear side. Further, the rollers 8c and 8d supported by the rear roller support portion 12) (rear rollers) are the upper rollers 8d.
Are located on the rear side, and the lower roller 8c is located on the front side. Further, the upper peripheral surfaces of the upper rollers 8a and 8d are connected to the upper surface 6a of the metal box 6 and the front roller support portion 11a.
And a support plate 11d provided on the rear roller support portion 12,
It is located on the same plane as 12d.

The motor unit 9 is fixed to the housing 5 which forms the main body of the X-ray foreign matter detector. The motor unit 9 includes a drive motor and a speed reducer. FIG.
As shown in (1), on the output shaft side of the motor unit 9, there is provided a connecting portion 31 which is connected to the connecting portion 24 of the roller 8d serving as a driving roller to position the rotating shaft 21 and the output shaft at the same coaxial position. . Also, the output shaft of the motor unit 9 includes
The other end of the male and female coupling 25 that is connected to the end of the roller 8d rotating shaft 21 is fixed.

Then, by connecting the connecting portion 24 of the roller 8d and the connecting portion 31 of the motor unit 9, the rotating shaft 21 of the roller 8d and the output shaft of the motor unit 9 are in the same coaxial position. The coupling 25 is connected. Thus, the rotation of the output shaft of the motor unit 9 is transmitted to the rotating shaft 21.

The connection between the connecting portion 24 of the roller 8d and the connecting portion 31 of the motor unit 9 is such that the rotating shaft 21 and the output shaft are coaxially positioned and the roller 8d is positioned. That is, the roller 8d has one end of a fixed shaft 23 for fixing the bearing portion 22 positioned and fixed on the supporting member 12c side of the rear roller supporting portion 12, and connecting the motor unit 9 with the connecting portion 24 on the opposite side. The connection with the portion 31 allows the positioning and support between the support members 12b and 12c.

The motor unit 9 is fixed to the housing 5 which is the main body of the X-ray foreign matter detection device,
2 or the metal box 6.

The transport belt 10 is an endless belt.
As shown in FIG. 2, each of the rollers 8a and 8a surrounds the metal box 6 in the vertical direction (the direction orthogonal to the horizontal direction of the slit 7).
b, 8c, 8d. Conveyor belt 10
When the side plate 13 of the front roller supporting portion 11 is attached to the metal box 6, the roller 18a is stretched between the rollers 8a, 8b, 8c, and 8d by a slide in which the fixture 18 is engaged with the hook 17. The support member 11b supporting the roller 8b and the notch 27 of the side plate 13 are provided with a tension adjusting mechanism (not shown) for moving the roller 8b along the notch 27. It is possible to adjust the tension. Thus, each roller 8a, 8
The conveyor belt 10 stretched between b, 8c and 8d is supported by the upper surface 6a of the metal box 6 and the supporting plates 11d and 12d flush with the upper surface 6a. Further, each roller 8a, 8
The width of the conveyor belt 10 stretched between b, 8c and 8d is substantially the same as or larger than the lateral length of the slit 7 of the metal box 6.

The conveyor belt 10 can release each of the rollers 8 only by disengaging the hooks 17 from the fixtures 18 on the side plate 13.
Since the tension between a, 8b, 8c and 8d is loosened, it can be easily removed. Thus, the transport belt 10
Is detachable from the rollers 8.

As shown in FIG. 1, the transport section 3 is entirely covered by a front cover 32, a rear cover 33 and a front cover 34 so as to prevent leakage of X-rays. Front cover 3
2. The rear cover 33 is formed with rollers 8a and 8d and an opening 35 having a predetermined height above the rollers 8a and 8d. The carry-in / out portions of the upstream device and the downstream device are disposed close to the pair of openings 35, respectively. For example, a packaging machine that accommodates an inspection object in a tray or the like is arranged in the former apparatus, and a sorting machine that sorts the quality according to the X-ray inspection result is arranged in the latter apparatus. The front-stage device connects the inspection object to the opening 35 of the front cover 32.
From the transfer device to the transfer belt 10, and is transferred from the opening 35 of the rear cover 33 to the subsequent device.

As shown in the figure, since the transporting section 3 has a transporting length longer than that of the housing 5, the front cover 32 and the rear cover 33 have upper and lower portions such that the opening 35 projects most toward the housing 5. Are formed with inclined surfaces having a predetermined angle, respectively. The front cover 34 is provided on the front side of the housing 5 and covers the front side of the transport unit 3. This front cover 34
The both sides are formed in a substantially trapezoidal shape along the shapes of the front cover 32 and the rear cover 33, and are pivotally supported by a hinge 36 provided at a lower portion so as to be openable to the front side.

FIG. 4 is a perspective view showing a state where the front cover 36 is opened. More specifically, the front cover 32
In the figure, triangular covers 32a and 32b are arranged at upper and lower positions with the opening 35 as a center when viewed from the front of the apparatus. Similarly, the rear cover 33 has a triangular cover 33.
a and 33b. These front cover 32 and rear cover 3
Each 3 is detachably fixed to the housing 5 with a screw.

As shown in the figure, by opening the front cover 34, the transporting unit 3 provided inside the casing 5 displays a total of five faces, that is, up, down, front and rear, and front, except for one face which is fixed to the casing 5. And maintenance and inspection and cleaning can be easily performed. The front cover 32, the rear cover 33, and the front cover 34 cover the entire periphery of the transport unit 3 so that leakage of X-rays inside can be prevented. Although not shown, at a plurality of locations in the transport direction of the transport belt 10,
An X-ray shielding member is provided to prevent leakage of X-rays from the opening 35 to the outside. The X-ray shielding member is made of, for example, rubber containing lead, and is configured to be suspended above the conveyor belt 10.

In the transport unit 3 having the above configuration, the roller 8d is rotated by the drive of the motor unit 9, and the rollers 8a,
The conveyor belt 10 stretched between 8b, 8c and 8d is circulated in a predetermined direction (forward or reverse). The circulation of the conveyor belt 10 is in a vertical direction (front-rear direction) orthogonal to the slit 7 of the metal box 6 that receives the X-rays emitted from the X-ray generator 1 in a planar manner. The transport belt 10 circulates along the upper surface 6a of the metal box 6 and the support plates 11d and 12d. This allows
The object to be inspected sent on the conveyor belt 10 has the upper surface 6a of the metal box 6 and the support plates 11d and 12d as support surfaces, and X
The light passes between planar X-rays extending from the line generator 1 to the X-ray detector 2.

As described above, the configuration of the transport unit 3 is integrated with the metal box 6 that houses the X-ray detector 2 that detects X-rays. The integrated X-ray detection unit 2 and transport unit 3 constitute an X-ray detection unit that transports the inspection object and detects X-rays transmitted through the inspection object.

Therefore, in the X-ray foreign substance detecting device configured as described above, the X-ray detecting unit 2 is housed in the metal box 6, and the transport unit 3 is detachably attached to the metal box 6. . Thus, the X-ray detection unit 2 and the transport unit 3 which are in close proximity to each other to detect a foreign substance contained in the transported inspection object are independently assembled so as to be detachable via the metal box 6. Maintenance such as inspection, repair, and cleaning of each part can be facilitated.

Since the metal box 6 has a waterproof structure over the entire circumference and is configured to receive the X-rays passing through the slits 7 at the X-ray detection unit 2, moisture leaking from the inspection object during transportation is provided. And the like can be shielded from the X-ray detection unit 2 and the stain can be washed with water.

The metal box 6 uses the flat upper surface 6a as a support surface for supporting the transport belt 10 on which the object to be inspected is placed. Therefore, the configuration can be simplified without requiring a separate support plate or the like. It becomes possible. Further, the roller 8 and the support member 11 are detachable, and if they are removed, there is no gap or seam and only the outer periphery of the metal box 6 is exposed, so that cleaning is easy and improvement in hygiene can be achieved. It becomes possible.

Next, the change of the length of the X-ray foreign matter detecting device will be described. Although the machine length of the apparatus is determined by the transport length of the transport unit 3, according to the transport unit 3 having the unit configuration as described above, the transport length can be easily changed. FIG.
It is the schematic diagram seen from the front for explaining a captain change.
The metal box 6 of the transport section 3 and the X-ray detection section 2 housed therein may be left fixed to the housing 5.

Then, the front roller support portion 11 and the rear roller support portion 12 provided before and after the metal box 6 in the transport direction are replaced with those having a desired transport length. That is, the new front roller support portion 11 and the new rear roller support portion 12 are each replaced with one having a desired length in the transport direction. Further, the front cover 32, the rear cover 33, and the front cover 34 attached to the housing 5 are replaced with ones corresponding to the new captain. As shown in the figure, the front cover 32 and the rear cover 33 each use a projection that projects a predetermined amount in the transport direction corresponding to the transport length of the new transport unit 3. Although not shown, the front cover 34 has a shape that covers the front sides of the front cover 32 and the rear cover 33. These front cover 32 and rear cover 3
Reference numeral 3 is screwed to the housing 5 and can be easily replaced.

At the time of this replacement, the driven rollers 8 attached to the front roller support 11 and the rear roller support 12
a, 8b, 8c, and the drive roller unit 8U are not replaced, and the front roller support 11,
It can be attached to the rear roller support 12. First, the front cover 34 is opened, the fixing member 18 is released, the side plate 13 is slid, the tension of the transport belt 10 is loosened, and the transport belt 10 is removed.
a, 8b, 8c to support members 11b, 11c, 12b, 1
Remove from the cutouts 27 and 28 of 2c. Also, the drive roller unit 8U can be removed simply by releasing the fixture 30. At this time, the coupling with the motor unit 9 can be separated and removed by the coupling 25 of the coupling portion 24 at the same time.

Thereafter, the front roller support portion 11 and the rear roller support portion 12 are respectively lifted with the fixing plates 11a and 12a lifted upward, so that the Dharma-shaped hole 15 and the locking portion 1 on the metal plate 6 side.
6 (bolt and washer) is disengaged. Thereafter, the front cover 32, the rear cover 33, and the front cover 34 are removed, and the front cover 32, the rear cover 33, and the front cover 34 for a new captain are attached to the housing 5.

Thereafter, a new front roller support 11 and a new rear roller support 12 are attached to the metal plate 6. On this occasion,
This is performed by moving the dharma-shaped holes 15 of the fixing plates 11 a and 12 a downward while engaging the locking portions 16 (bolts and washers) of the metal plate 6.

Next, the support members 11b, 11c, 12b,
Driven rollers 8a, 8b, 8
Attach c. Further, the drive roller unit 8U is positioned and mounted on the support portions 29 of the support members 12b and 12c, and is fixed by operating the fixing device 30. At this time, the drive roller 8 d is simultaneously connected to the motor unit 9 by the coupling 25 of the connection portion 24. Then, after attaching the belt 10 suitable for the new transport length, the fixing device 18 is fixed and the side plate 13 is slid to apply tension to the transport belt 10.

As described above, the captain can be changed, and the parts to be replaced in this change are the support members 11 and 12,
Only the transport belt 10, the front cover 32, the rear cover 33, and the front cover 34 are provided. Therefore, the machine length can be changed without attaching and detaching the metal box 6 in which the X-ray detection unit 2 is accommodated, that is, the main part of the X-ray detection unit. Accordingly, since the position of the X-ray detection unit 2 is not changed, the relative position with respect to the X-ray generation unit 1 does not change, and adjustment of the irradiation position and the like can be unnecessary. Furthermore, the captain can be changed while the installation position of the housing 5 is fixed, and even when the arrangement interval between the front and rear devices is changed, the captain is changed by the above simple procedure, The object to be inspected can be stably transferred to and from the subsequent device.

In the above-described embodiment, the configuration in which the front roller support portion 11 and the rear roller support portion 12 that can be attached to and detached from the metal box 6 are replaced when the captain is changed, but the captain change can be performed without being limited to this. For example, when the machine length is made longer than before, the front roller support portion 11 and the rear roller support portion 12 may be used as they are. In this case, the front surface 6b and the rear surface 6c of the metal box 6 and the front roller support 1
1. A connecting member is arranged between the rear roller supporting portion 12 and the front roller supporting portion 11 and the rear roller supporting portion 12 are fixed to the metal box 6 via the connecting member.
Each of the connecting members has the above-mentioned Dharma-shaped hole 15,
A plurality of locking portions 16 are provided.

[0058]

According to the present invention, when the machine length is changed, it is only necessary to replace the roller support portion and the conveyor belt with those having a desired conveyance length, and the operation can be performed simply and easily by replacing only a minimum number of parts. Since this roller supporting portion is configured to be detachable from a metal box that houses the X-ray detecting portion in a sealed manner,
It is not necessary to replace the X-ray detector even when changing the PIC.
The captain can be changed while the leakage of X-rays from the X-ray detection unit to the outside is prevented. As a result, the captain can be changed without replacing the entire apparatus. Further, in the case of replacing an old device installed between the preceding device and the succeeding device of the line, it is possible to easily obtain the length required for a new device. According to the second aspect, it is only necessary to replace and attach the cover corresponding to the transport length to the housing when the machine length is changed, and the X-ray shielding of the transport unit can be easily performed. Claim 3
According to this, by providing the engagement portion between the metal box and the roller support portion, the attachment / detachment and replacement of the roller support portion can be easily performed. According to the fourth aspect, the drive roller is formed as a unit, and can be easily attached to and detached from the roller support portion, so that the operation of changing the machine length can be performed more easily.
According to the fifth aspect, since the connecting portion is provided at one end of the driving roller so that the driving force of the motor can be separated, the mounting and dismounting of the driving roller unit can be more easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an X-ray foreign matter detection device according to the present invention.

FIG. 2 is a perspective view showing an X-ray detection unit provided inside the apparatus.

FIG. 3 is an exploded perspective view of the X-ray detection unit.

FIG. 4 is a perspective view showing a state in which a front cover of the X-ray foreign matter detection device is opened.

FIG. 5 is a front view showing a machine length change state of the X-ray foreign matter detection device.

FIG. 6 is a diagram showing a conventional X-ray foreign matter detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... X-ray generation part, 2 ... X-ray detection part, 6 ... Metal box, 6a ...
Upper surface, 7: slit, 8 rollers, 10: conveyor belt, 1
1. Front roller support, 11b, 11c, 12b, 12
c: Supporting member, 12: Rear roller supporting portion, 15: Dharma-shaped hole, 16: Locking portion, 18U: Drive roller unit, 3
2 front cover, 33 rear cover, 34 front cover.

Claims (5)

[Claims] 1. An X-ray foreign matter detection device which irradiates an X-ray to the inspected object and detects foreign matter therein while the inspected object is transported by a transport unit having a predetermined transport length. An X-ray detection unit that detects X-rays that have passed through an object is housed in a sealed state, and a metal box fixed to the device housing, and a metal box that is detachably attached to the front and rear positions of the metal box with respect to the transport direction of the inspection object. A roller support portion, a plurality of rollers detachably supported by the roller support portion, and a transport belt that passes between upper and lower surfaces of the metal box by being stretched between the rollers. X is characterized in that the transport length of the transport section can be changed freely by attaching the roller support sections corresponding to the transport length to the front and rear positions of the metal box and attaching a transport belt of the corresponding transport length. Wire foreign matter detector 2. The X-ray foreign matter detection device according to claim 1, wherein the housing has a length corresponding to a transport length of the transport unit and has a cover for preventing leakage of X-rays. 3. The X-ray foreign matter detection device according to claim 1, wherein an engagement portion for engaging and disengaging the metal box and the roller supporting portion is provided on the joining surface. 4. A drive roller unit for transporting and driving the transport belt is detachably provided on the roller support portion. The drive roller unit comprises a pair of bearing portions provided at both ends of a drive roller, 2. The X according to claim 1, further comprising: a fixed shaft provided in parallel with the roller, wherein the pair of bearing portions are respectively fixed.
Line foreign matter detection device. 5. An end of a rotation shaft of the driving roller,
5. The X-ray foreign matter detection device according to claim 4, further comprising a separable connecting portion for transmitting a driving force of the motor.