JP4228880B2 - Landry monitor - Google Patents

Description

  This invention can be applied after completing washing (decontamination) to remove contamination (radioactive contamination) due to radioactive materials such as clothes worn by workers engaged in radioactive material handling facilities such as nuclear power plants. The present invention relates to a landry monitor that inspects for the presence or absence of radioactive contamination in a decontaminated clothing or the like that is an inspection, and sorts the inspection object according to the inspection result.

FIG. 3 is a perspective view showing an appearance of an example of a conventional landry monitor, and FIG. 4 is a side sectional view showing an internal structure thereof.
As described above, the Landry Monitor is a device that inspects and sorts the presence or absence of radioactive contamination after decontamination of clothes, etc. worn by workers engaged in radioactive material handling facilities. Folding table 1 for loading dyed clothing and the like into the apparatus, transport unit 2 for transporting the test object, radiation detection unit 4 for detecting radiation from the test object, and control unit 5 "Insert ready" indicator light 61, sound generator 62, printer 63, operation panel 7 having switches and indicators for operating the apparatus, maintenance door 8, and indicator light (not shown) An operation mode changeover switch and the like.
The transport unit 2 includes a drive motor (not shown), a drive transmission belt that transmits power of the motor, a lower drive roller 23 and an upper drive roller 24 that are driven by the drive transmission belt, and these rollers 23 and 24, respectively. The lower round belt 26 and the upper round belt 27 that are driven by rubber, a plurality of fixed position rollers 30 that position the round belts 26 and 27, and the positions of these round belts 26 and 27 The upper and lower tension rollers 25 and a tension adjusting mechanism (not shown) for applying appropriate tension to the round belts 26 and 27, an inlet side photoelectric sensor 28 and an outlet side photoelectric sensor 29 for detecting the position of the object to be conveyed. And is composed of. The lower drive roller 23 and the upper drive roller 24 are arranged on the exit side of a portion for transporting clothes and the like to pull the round belts 26 and 27, respectively, in order to avoid the round belts 26 and 27 from loosening. . A transport section guide plate (not shown) is provided below the lower round belt 26 where the test object is transported.

The lower drive roller 23 and the upper drive roller 24, a plurality of fixed position rollers 30, a tension roller 25, and a lower round belt 26 and an upper round belt 27, which are specimen holding and conveying members, Consists of a conveyor. The lower drive roller 23, the upper drive roller 24, the fixed position roller 30 and the tension roller 25 are formed with a positioning belt groove 231 for accurately maintaining the position of the round belt 26 or 27. FIG. 5 is a front view showing the detailed shape of the lower drive roller 23. The left side of the figure shows a state without a round belt, and the right side shows a state with a round belt. Both photoelectric sensors 28 and 29 comprise a projector and a light receiver, respectively.
The radiation detection unit 4 includes a plastic scintillator detector 41, a lead shield 42 surrounding the plastic scintillator detector 41, and a signal processing circuit (not shown).

The “insertable” indicator lamp 61 is turned on when there is no abnormality such as retention of the test object inside the apparatus, and the worker puts the test object on the folding table 1 and is composed of the lower round belt 26. When inserted into the conveyor, the sound generator 62 generates a “ping-pong” sound. The inserted test object is conveyed by the operation of the measurement start button on the operation panel 3, and the radiation detection unit 4 is inspected for the presence of radioactive contamination, and is sorted according to the inspection result. Inspection results, setting values, and the like are printed by the printer 63. Further, the operation mode changeover switch is used to switch the operation mode to an automatic mode for normal measurement, a calibration mode applied at the time of calibration of a radiation detector using a radiation source, or a manual mode applied at the time of maintenance.
The operation panel 7 includes a measurement start button for starting the measurement, a measurement end button for ending the measurement, an LCD operation display for displaying various information such as a device failure and abnormality, and an alarm for resetting the alarm after the failure and abnormality are recovered. A reset switch, a counter reset switch for resetting a counter for counting the number of measured objects, and the like are provided.

As this type of landry monitor, one having a configuration described in Patent Document 1 is known.
Japanese Patent Laid-Open No. 6-123776

  In the Landry monitor configured as described above, the test object is driven by the lower drive roller 23 and the upper drive roller 24, respectively, and is guided by the fixed position roller 30 and the tension roller 25, respectively. In the case where the specimen is frayed and the frayed yarn is taken out, this frayed yarn is the belt of the lower drive roller 23 on the exit side of the specimen conveyance section. If the frayed yarn does not break when entering the groove 231, the test object stays at the position of the lower drive roller 23. This state is likely to occur in the case of a light glove or sock that is easy to get loose. In the case of a heavy test object such as work clothes, even if a frayed yarn is wound, it is cut off and hardly stays. Once in the staying state, the specimens that are transported later cannot be transported well, so the specimens are piled up at this position, overloading the drive motor, and stopping the drive motor It also becomes. Such a state occurs on the exit side of the conveyor of the lower conveyor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a Landry monitor that can solve the above-described troubles during conveyance and can normally convey a test object with a frayed yarn.

  The invention of claim 1 is the presence or absence of radioactive contamination of the test object such as decontaminated clothing that has been cleaned by removing clothes worn by workers engaged in radioactive material handling facilities such as nuclear power plants. In order to classify the test object according to the inspection result, the land monitor has a test object transporting means, a radioactive contamination test means, a sorting means, etc., and the test object is used as the transporting means. A plurality of rubber band-like endless belt groups that circulate by mounting and a plurality of belt grooves that are arranged on the exit side of the conveyance part of the test object and that are fitted with the endless belt groups, and are driven by a drive motor A driving roller for circulating the endless belt group fitted in the belt groove, and a plurality of rollers for guiding the endless belt group by determining the position of the endless belt group together with the driving roller The fray yarn of the test object is prevented from being caught in the belt groove between the lower drive roller in the drive roller and the endless belt group drawn into the drive roller. A frayed yarn wrap prevention plate is provided.

According to the first aspect of the present invention, since the frayed yarn winding prevention plate is provided between the lower driving roller and the endless belt group drawn into the driving roller, the frayed yarn of the object to be conveyed is placed on the lower side. The possibility of being caught in the belt groove of the driving roller is greatly reduced.
According to a second aspect of the present invention , in the first aspect of the invention, as the fray yarn entanglement prevention plate, an endless belt belt upper side of the endless belt group retracting side of the lower driving roller of the driving roller and an endless front thereof. A comb-shaped frayed yarn winding prevention plate is provided that covers a portion of the belt group excluding a passing portion at a height lower than the upper surface of the endless belt group.

The comb-shaped frayed thread winding prevention plate can cover up to the belt groove part where the endless belt group is somewhat caught, so that the frayed thread of the object to be transported can be caught in the belt groove of the driving roller. This is further reduced as compared with the case of the invention of claim 1.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the frayed yarn is placed on the upper surface of the frayed yarn winding prevention plate at a position close to the drive roller directly below the passing portion of the endless belt group. It is provided with a fraying thread exclusion projection that is moved to the position.
The fray thread exclusion protrusion moves the fray thread that slides on the fray thread prevention plate or the comb-shaped fray thread prevention plate in a hung state from side to side, further increasing the possibility that the fray thread may enter the belt groove. Reduce.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the flat shape of the fraying thread eliminating protrusion is a circle, a square or rhombus whose diagonal is the moving direction of the endless belt group, or a side to which the endless belt group is fed. Is either an equilateral triangle or an isosceles triangle.
These shapes are optimal for moving the frayed yarn that slides on the frayed yarn entanglement prevention plate or the like in a suspended state to the left or right.

In the first aspect of the present invention, since the fray yarn entanglement preventing plate is provided between the lower drive roller and the endless belt group drawn into the drive roller, the fray yarn of the object to be conveyed is located on the lower side. The possibility of being caught in the belt groove of the driving roller is greatly reduced. Therefore, according to the present invention, it is possible to provide a land monitor that can be normally transported even when a test object with a frayed thread is transported.
In the second aspect of the invention, since the comb-shaped frayed yarn winding prevention plate capable of covering the belt groove portion where the endless belt group is somewhat fitted is provided, the frayed yarn of the object to be conveyed is driven by the driving roller. The possibility of being caught in the belt groove is further reduced as compared with the case of the invention of claim 1.
In the invention of claim 3, since the frayed yarn exclusion projection for moving the frayed yarn that slides on the frayed yarn entanglement prevention plate in a suspended state to the left and right is provided, there is a possibility that the frayed yarn enters the belt groove. Is further reduced.

In the invention of claim 4, the planar shape of the fray thread exclusion protrusion is circular, a square or rhombus whose diagonal is the moving direction of the endless belt group, or a regular triangle whose apex is the side to which the endless belt group is fed, or Although it is one of the isosceles triangles, these shapes are optimal for moving the frayed yarn that slides on the frayed yarn entanglement prevention plate in a suspended state from side to side.

  The best mode for carrying out the landry monitor according to the present invention will be described with reference to an embodiment.

This embodiment has the same appearance and internal configuration as the conventional example shown in FIGS. 3, 4 and 5, and is a folding table for placing washed clothes or the like as a test object into the apparatus. And a transport unit for transporting the test object, a radiation detection unit for detecting radiation from the test object, a control unit, an operation panel equipped with switches and indicators for operating the apparatus, etc. Yes. Since this embodiment is different from the conventional example in the vicinity of the exit of the test object in the transport section, the following description will be limited to this portion of the embodiment, and description of the other portions will be omitted.
1A and 1B show the configuration of the main part of an embodiment of a landry monitor according to the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a side view. In addition, the same code | symbol is used for the part of the same function as a prior art.
The feature of this embodiment is that the frayed yarn of the frayed test object is prevented from entering into the belt groove 231 of the lower drive roller 23 arranged on the outlet side of the conveyance part of the test object and wrapping around it. The fraying thread winding prevention plate 22 is provided.

  The fraying yarn winding prevention plate 22 is attached to the upper surface of the conveying unit guide plate 21 and is arranged from the lower side of the plurality of rubber lower round belts 26 constituting the endless belt group of the lower conveyor. And the lower round belt 26 pull-in side of the lower drive roller 23, and has a comb shape extending to both side surfaces of the lower round belt 26. That is, the portion through which the lower round belt 26 passes is removed as the cut portion 221 to form a comb tooth shape, and the comb tooth portion covers the belt groove 231. The tip position of this portion is limited to a position where the height is lower than the upper surface of the lower round belt 26 so that the frayed yarn winding prevention plate 22 does not hinder the conveyance of the test object. Further, immediately before the notch portion 221, a frayed yarn removal protrusion 222 having a trapezoidal cross-sectional shape and a circular planar shape and having a diameter somewhat larger than the width of the belt groove 231 is formed by pressing or the like. The fraying thread exclusion protrusion 222 moves the fraying thread sliding on the surface of the fraying thread entanglement prevention plate 22 to either the left or right side. The entry into the groove 231 can be greatly reduced.

By providing such a frayed yarn winding prevention plate 22, it is possible to prevent the frayed yarn of the frayed test object from entering the belt groove 231 and being wound around the lower drive roller 23.
It should be noted that the frayed yarn entanglement preventing plate 22 in which the comb teeth of the frayed yarn entanglement preventing plate 22 are eliminated can also restrict the frayed yarn from entering the belt groove 231.
Also, the circular fraying thread exclusion protrusion 222 shown in FIG. 1 is replaced with the rhomboid or square fraying thread exclusion protrusion 222a shown in FIG. 2A, or the regular triangle or isosceles triangle shown in FIG. 2B. It can also be replaced with a fray thread exclusion protrusion 222b. In the case of FIG. 2A, the moving direction of the lower round belt 26 is a diagonal line, and in the case of FIG. 2B, the incoming side of the lower round belt 26 is a vertex.

The structure of the principal part of the Example of the Landry monitor by this invention is shown, (a) is a top view, (b) is a side view A plan view and a side view showing another example of the shape of the fraying thread exclusion protrusion A perspective view showing an appearance of an example of a conventional Landry monitor Side sectional view showing the internal structure of a conventional example Front view showing detailed shape of lower drive roller 23

Explanation of symbols

1 Folding table 2 Transport section
21 Transport section guide plate
22 Fraying thread winding prevention plate
221, 221a, 221b
23 Lower drive roller
231 Belt groove
24 Upper drive roller
25 Tension roller
26 Lower round belt
27 Upper round belt
28 Inlet photoelectric sensor
29 Outlet photoelectric sensor
30 Fixed position roller 4 Radiation detector
41 Plastic scintillator detector
42 Lead shield 5 Control section
61 `` Insert ready '' indicator light
62 Audio generator
63 Printer 7 Operation panel 8 Maintenance door

Claims (4)

Inspecting the presence of radioactive contamination in the decontaminated clothing and other objects that have been cleaned by removing the clothes worn by workers engaged in radioactive material handling facilities such as nuclear power plants, and the results of the inspection In order to classify the test object by means of the Landry monitor equipped with the transport means of the test object and the radioactive contamination inspection means, the sorting means,
A plurality of rubber band-like endless belt groups that carry and circulate the test object as the transport means, and a plurality of belt grooves that are arranged on the exit side of the transport part of the test object and for fitting the endless belt group A driving roller that circulates the endless belt group that is driven by the driving motor and is fitted in the belt groove, and a plurality of rollers that determine the position of the endless belt group together with the driving roller and guide the endless belt group , And
Fraying thread winding for preventing the fraying thread of the test object from being caught in the belt groove between the lower driving roller of the driving rollers and the endless belt group drawn into the driving roller. Equipped with a prevention plate,
Landry monitor characterized by that. The frayed thread winding prevention plate is formed on the upper surface of the endless belt group except for the upper part of the belt groove on the endless belt group retracting side of the lower driving roller of the driving roller and the front part thereof excluding the passing part of the endless belt group. A comb-shaped frayed yarn prevention plate covering at a lower height,
La Ndorimonita of claim 1 you wherein a. On the upper surface of the frayed yarn winding prevention plate, provided with a frayed yarn exclusion projection for moving the frayed yarn to the left and right at a position close to the drive roller just below the passing portion of the endless belt group,
The landry monitor according to claim 1 or 2, wherein The flat shape of the fray thread exclusion protrusion is a circle, a square or rhombus whose diagonal is the moving direction of the endless belt group, or a regular triangle or an isosceles triangle whose apex is the side to which the endless belt group is fed. is there,
The landry monitor according to claim 3.

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