JP4675074B2 - Dust collector - Google Patents

Description

The present invention relates to a dust collector for efficient use of the dust collecting filter to determine the recyclable whether the filter dust collection for dust collection radioactive dust (hereinafter referred to as radioactive dust).

  2. Description of the Related Art Radioactive isotope handling facilities such as nuclear facilities and universities / research centers use dust collectors that collect radioactive dust contained in air by passing the air in the facilities through a dust collection filter. Specifically, this dust collector is a dust monitor that is used to measure the concentration of radioactive dust present in the air in a radioisotope handling facility and to manage the exposure of radiation workers. . Hereinafter, a dust monitor, which is a specific example of the dust collector, will be schematically described.

  19 is a configuration diagram of a detection unit of the dust monitor 100 of the prior art, FIG. 20 is an explanatory diagram of the detector 112, FIG. 20 (a) is a main configuration diagram, and FIG. 20 (b) is a count value-crest voltage line. FIG. As shown in FIG. 19, the dust monitor 100 includes a suction port 111, a detector 112, a detector holder 113, a dust collection filter 114, a dust collection case 115, a filter replacement door 116, and a discharge port 117, and is radioactive. The radiation dose from the dust is detected by the detector 112.

  The air in the radioactive isotope handling facility flows into the dust collection case 115 through the suction port 111, passes through the dust collection filter 114, and is discharged from the discharge port 117. The detector 112 fixed to the detector holder 113 detects radiation emitted from the radioactive dust collected by the dust collection filter 114 and counts the dose. For example, as shown in FIG. 20A, the detector 112 includes a semiconductor detection element 120, an amplification unit 121, a wave height discrimination unit 122, and a central processing unit (CPU: Central Processing Unit) 123. The central processing unit 123 has a counter function.

The semiconductor detection element 120 outputs a detection signal in response to detection of radiation from the radiation dust 200.
The amplifying unit 121 amplifies the detection signal with a predetermined gain, and appropriately adjusts the amplitude voltage (wave height) of the detection signal.
Specifically, the wave height discriminating unit 122 is a discriminator circuit, which inputs a detection reference peak voltage determined by the voltage dividing resistors 122a and 122b to the comparator 122c, and discriminates a signal that exceeds the detection reference peak voltage from the detection signal. Separately, it is output as a pulse signal. By this pulse height discrimination, noise due to background lower than the detection reference peak voltage (hereinafter referred to as background noise) is removed.
The central processing unit 123 functions as a counter that counts pulse signals from which such background noise has been removed. Thereby, the radiation dose is counted, and dose data representing the count value is generated and output. The dose data is transmitted to another central processing unit configured by a computer or the like via a communication line, and various processes are performed.

The contents of this dose data will be described. Radiation dust is a radionuclide. These radionuclides are classified into artificial radionuclides and natural radionuclides. Natural radionuclides are long-lived half-life and daughter daughters with radioactivity. Artificial radionuclides are produced by man-made, and they are short-lived nuclides that are almost extinct in nature. Yes.
In such a detector 112, if there is no wave height discriminating section 122, as shown in the count value-wave voltage line characteristic diagram of FIG. A numerical value is output from the counter. This includes radiation doses from natural radioactive materials that exist in nature, i.e. natural nuclides.
However, according to the discrimination of the wave height discriminating unit 122, a signal having a voltage exceeding the detection reference peak voltage is output as a pulse signal as a detection target, but background noise below the detection reference peak voltage is excluded from the detection target and removed. It is possible to detect only the radiation dose emitted from the artificial radionuclide with high wave height leaking from the radioactive material handling facility.

Returning to FIG. 19, in such a dust monitor 100, the dust collection filter 114 is replaced after a predetermined period. The dust collection filter 114 is easily handled as a cartridge type. For replacement, the filter replacement door 116 is opened and the old dust collection filter 114 is removed, and then a new dust collection filter 114 is mounted. And the filter replacement door 116 is closed.
The prior art dust monitor 100 is like this.

Moreover, as a prior art example of such a dust monitor, for example, Patent Document 1 (invention name: radioactive dust monitor) is disclosed.
Similarly to the dust monitor shown in FIG. 20, this radioactive dust monitor also collects radioactive dust on a filter (filter paper) installed in the ventilation unit and is arranged so as to face the filter (filter paper). The instrument detects the radiation.

Furthermore, as another prior art example, for example, Patent Document 2 (Title of Invention: Radioactive Dust Monitor and Radio Paper Dust Monitor Filter Paper Recyclability Determination Device) is disclosed, for example.
This radioactive dust monitor employs a system in which a long strip of filter paper is fed out from a supply pulley, thereby reducing the trouble of replacing the filter paper.

JP 2002-277552 A (paragraph numbers 0022 to 0025, FIG. 1) JP 2003-315461 A (paragraph number 0029, FIG. 1)

In the dust monitor, as in the prior art shown in FIG. 19 and the prior art of Patent Document 1, a single dust collecting filter is arranged at the detection position, or as in the prior art of Patent Document 2, the long monitor is used. A continuous method is adopted in which band-shaped filter paper is continuously inserted. In any dust monitor, the filter for dust collection after dust collection and measurement is screened to determine whether it is radioactively contaminated. If it is contaminated, it is disposed of as radioactive pollutant. If it is not contaminated, it is disposed of as normal waste.
However, since the dust collecting filter is replaced and discarded every predetermined time in the single unit method, it is time-consuming and waste cannot be saved.
In addition, the continuous method uses a long filter paper, so it is not necessary to replace it. However, if there is radioactive contamination even in a part of the filter paper, it is discarded as radioactive contamination, or Therefore, it is necessary to sort again at the time of disposal of the waste, and there is room for improvement in terms of reducing labor and waste saving at the time of disposal.

Therefore, the present invention has been made in view of the above problems, and its purpose is to reduce the disposal loss of the dust collection filter by using up the dust collection filter without waste and to reduce the operation cost. performing the current reusability determination Priority determination of dust filters is to provide a dust collector so as to utilize the dust collecting filter efficiently.

In order to solve the above problems, a dust collector according to claim 1 of the present invention provides:
A dust collector that collects radioactive dust by passing the air of a radioactive isotope handling facility through a cartridge-type dust filter ,
A dust collection filter is installed at the filter installation position, and a detector that outputs dose data according to the radiation dose from the radioactive dust collected by the dust collection filter and the pressure downstream of this dust collection filter A pressure sensor that measures and outputs pressure data ; and a detection unit having at least
Replacement that replaces the dust collection filter that is determined as non-reusable at the filter installation position of the detection unit with a new dust collection filter. Unit,
A discharge unit for discharging the dust collection filter determined to be non-reusable from the replacement unit;
A supply unit for supplying a new dust collection filter to the filter mounting portion of the replacement unit from which the dust collection filter determined to be non-reusable is discharged;
The dose data from the detector and the pressure data from the pressure sensor are input to determine whether or not reuse is possible, and the drive control of the replacement unit, the discharge unit, and the supply unit is performed based on the determination result of whether or not reuse is possible. A central processing unit for performing
The provided, the central processing unit further
It is installed in the filter installation position of the detection unit, the dust collection filter to be determined for reusability, if below the boundary dose data dose data is predetermined radioactive dust of dust-collecting filter radioactivity examine each and dose conditions that low, and the pressure conditions the pressure loss due to deposition of radioactive dust of dust-collecting filter if above the boundary pressure data is pressure data predetermined is to be within a predetermined value, the Means,
Only when these dose conditions and pressure conditions are satisfied, the dust collection filter that is subject to determination of reuse is determined to be reusable, and in other cases, the dust collection filter is determined to be non-reusable,
Means for controlling the replacement unit to move the dust collection filter determined to be non-reusable from the filter installation position of the detection unit to the filter discharge position of the discharge unit;
Means for controlling the discharge unit so as to discharge the dust collection filter determined to be non-reusable at the filter discharge position from the replacement unit;
Means for controlling the replacement unit so that the filter mounting portion from which the dust collection filter determined to be non-reusable is discharged moves to the filter supply position of the supply unit;
Means for controlling the supply unit to supply a new filter for collecting dust to the filter mounting portion of the moved replacement unit;
Means for controlling the replacement unit to move the next dust collection filter to the filter installation position of the detection unit ;
It is characterized by providing.

Further, the dust collector of the invention according to claim 2 of the present invention,
The dust collector according to claim 1,
The detection unit is a dust collection case on the upstream side of the dust collection filter and the detector is installed; a suction case on the downstream side of the dust collection filter and the pressure sensor is installed; An up-and-down drive unit that moves the suction case up and down;
The replacement unit includes a turntable on which a filter mounting portion is formed by a plurality of holes that are rotatably supported and in which the filter for dust collection is disposed, and the filter mounting portion by rotating the turntable. A position indexing unit for moving
The central processing unit is
When removing the dust collection filter that has been determined to be non-reusable from the detection unit, the suction case is lowered to support the dust collection filter only by the filter mounting portion of the turntable. And controlling the vertical drive unit of the detection unit to rotate the turntable so that the dust collection filter determined not to be reused from the filter installation position of the detection unit to the filter discharge position of the discharge unit Means for controlling the position indexing portion of the exchange unit to move;
When the new dust collection filter is attached to the detection unit, the position table of the replacement unit is arranged so that the turntable is rotated and the new dust collection filter is positioned at the filter installation position of the detection unit. The vertical drive unit of the detection unit is controlled so as to control the exit portion and raise the suction case so that the dust collection case and the suction case are clamped to seal and fix a new dust collection filter. Means,
It is characterized by providing.

The dust collector of the invention according to claim 3 of the present invention is
The dust collector according to claim 2, wherein
The discharge unit is supported so as to be movable in the vertical direction, and pushes up a dust collecting filter that is determined to be non-reusable and is mounted on the filter mounting portion of the turntable. A push-up unit drive unit that is driven in the direction, a rod that is configured to be movable in the horizontal direction and that sweeps out the dust collecting filter that is determined to be non-reusable at the filter discharge position, and is driven and discharged in the horizontal direction. And a stocker for storing the dust collection filter determined to be non-reusable after discharging,
The central processing unit
In order to discharge the filter for dust collection determined to be non-reusable at the filter discharge position from the replacement unit,
Means for controlling the position indexing portion of the replacement unit to rotate the turntable and position the filter for dust collection determined to be non-reusable at the filter discharge position;
Means for controlling the push-up unit drive unit of the discharge unit so as to push up the dust collecting filter determined to be unusable by raising the push-up unit from the filter placement unit of the turntable;
Means for controlling the rod drive part of the discharge unit to move the rod to sweep out the dust collecting filter at the filter discharge position determined to be non-reusable to the stocker ;
It is characterized by providing.

Further, the dust collector of the invention according to claim 4 of the present invention,
The dust collector according to claim 3,
The supply unit includes a stocker that accommodates a new dust collection filter, and a hand that is supported so as to be movable in the horizontal direction and pushes a new dust collection filter from the stocker to the filter placement portion of the turntable; A hand drive unit for driving the hand in the horizontal direction,
The central processing unit
In order to supply a new dust collecting filter to the filter mounting portion of the replacement unit from which the dust collecting filter determined to be non-reusable has been discharged,
Means for controlling the position indexing portion of the replacement unit to rotate the turntable to position the filter mounting portion of the turntable at a filter supply position;
The hand driving unit of the supply unit is loaded so that the filter mounting unit of the turntable is loaded with one new dust collecting filter in the stocker that pushes out the hand and accommodates a new dust collecting filter. Means for controlling;
It is characterized by providing.

According to the present invention, so as to use up the dust collecting filter without waste and reduce the loss on disposal of filter for dust collection, the re-availability-format constant of the dust collecting filter in order to reduce operating cost reduction Thus, it is possible to provide a dust collecting device that performs the dust collection filter efficiently.

Next, the best mode for carrying out the dust collector of the present invention will be described with reference to the drawings. In this embodiment, a specific example of the dust collecting apparatus is assumed to be a dust monitor, and the dust monitor will be collectively described as having a determination function based on a dust collection filter reusability determination method.
FIG. 1 is a configuration diagram of a dust monitor 1 according to the present embodiment, in which FIG. 1A is a plan view and FIG. FIG. 2 is a circuit block diagram of the dust monitor 1 of the present embodiment. The dust monitor 1 is a device that collects radioactive dust contained in indoor air in a dust collection filter 2 and measures the concentration of radioactive dust in the air, for example, in a radioisotope handling facility. As shown by 1 (a) and (b), when roughly divided, a detection unit 3, an exchange unit 4, an operation unit 5, and a base portion 6 are provided.

The detection unit 3 is a unit for collecting dust and measuring the concentration of radioactive dust in the air. As shown in FIGS. 1 (a) and 1 (b), the suction port 3a, the suction pump 3b, the detector 3c, a dust collection case 3d, a linear slider 3e, a suction case 3f, a discharge port 3g, a flow path 3h, a pressure sensor 3i, and a vertical drive unit 3j.
In the detection unit 3, a flow path is formed from the suction port 3 a, the dust collection case 3 d, the dust collection filter 2, the suction case 3 f, the flow path 3 h, the suction pump 3 b, and the discharge port 3 g through a flow path (not shown). The Although not shown in the figure, the upstream of the suction port 3a is connected to, for example, an exhaust port that exhausts air in the facility of the radioisotope handling facility. Although not shown, the downstream of the discharge port 3g is connected to, for example, an exhaust port to the outside of the radioisotope handling facility.

  The suction pump 3b functions as a suction source. When suction is started, radioactive dust together with air in the radioactive isotope handling facility flows into the dust collection case 3d through the suction port 3a, and the dust collection case. Radioactive dust is collected by the dust collection filter 2 in 3d. And air is discharged | emitted from the discharge port 3g to the external world through the suction case 3f, the suction pump 3b, and the flow path which is not shown in figure. Thus, a flow path through which air always passes through the dust collecting filter 2 is formed in the detection unit 3.

As shown in FIG. 2, the circuit block of the dust monitor 1 includes a central processing unit 7, an operation unit 5a, a detector 3c, a pressure sensor 3i, a display unit 5b, a suction pump 3b, a position indexing unit 4c, upper and lower parts. It is comprised by the drive part 3j.
The detector 3c outputs dose data regarding radiation of radioactive dust collected by the dust collection filter 2. Similarly, the pressure sensor 3i measures the pressure in the suction case 3f that is at a low pressure by the suction pump 3b, and outputs pressure data.
The operation / stop of the suction pump 3b is controlled.
An operation such as detection start is input through the operation unit 5a of the operation unit 5, and a detection result is output through the display unit 5b. The position indexing unit 4c and the vertical drive unit 3j shown in FIG. 2 will be described later.

Next, a dose detection operation in the detection unit 3 will be described.
The detector 3c has, for example, the same configuration as the detector 112 described above with reference to FIG. 20B, and outputs dose data by the same detection process as that of the conventional technique. In this case, the central processing unit 123 of the detector 112 in FIG. 20B and the central processing unit 7 in FIG. 2 are communicably connected, and dose data output from the detector 3c is the central processing unit 7. Sent to. The central processing unit 7 performs data processing based on the dose data, and displays the dose on the display unit 5b. Moreover, you may make it have a function which alert | reports having detected the abnormal state which the density | concentration in air | atmosphere increased rapidly by a display and audio | voice alarm etc. as needed.

Next, the reusability determination operation of the dust collection filter 2 in the detection unit 3 will be described.
The premise of the availability determination will be described. The dust monitor 1 is intended to monitor radioactive materials leaked into the air from various devices in the radioisotope handling facility, and the target is artificial radioactive materials (artificial nuclides). On the other hand, natural radioactive materials (natural nuclides) such as radon and thoron are contained in the atmosphere, and the same natural nuclides are released into the air from the concrete in the building. For example, outside air is taken into a radioisotope handling facility through a building ventilation air conditioning system, and natural nuclides are also supplied from concrete built in the building, so the air in the facility always contains natural nuclides. There are dusty radon progeny nuclides and thoron progeny nuclides that are natural radioactive substances contained in the air in such a radioisotope handling facility, and these dusty progeny nuclides are also collected in the dust filter 2 It becomes. Since the half-life of these natural radioactivity is relatively short and the radioactivity becomes low after a sufficient period of time, for example, one week, the influence of the natural radioactivity on the natural nuclide can be ignored, and the artificial nuclide is added to the filter. Otherwise, it can be reused. Therefore, the presence or absence of an artificial nuclide that reaches the predetermined dose in the dust collection filter 2 is investigated. These artificial nuclides are managed so as not to leak out, and since there are few artificial nuclides, it is not necessary to discard many dust collection filters 2.
Further, when radioactive dust accumulates on the dust collection filter 2, air does not pass through and the collection ability is reduced, so the presence or absence of accumulation is investigated. Actually, it is isolated in multiple by equipment (eg, reactor pressure vessel / reactor containment vessel) installed in the radioisotope handling facility, and the air is also in a clean environment free from dust and radiated. High-performance radioactive dust is hardly deposited in the air, and is rarely deposited on the dust collecting filter 2 and can be used for a long period of time. For this reason, the dust collecting filter 2 can be reused repeatedly over a long period of time.
A determination method considering such a situation is as follows. If the radiation dose from the radioactive dust collected by the dust collection filter 2 is lower than the predetermined boundary dose, the dose condition that the radioactivity of the radioactive dust in the dust collection filter 2 is low, and the dust collection If the pressure in the space downstream of the filter 2 exceeds a predetermined boundary pressure, the pressure condition that the pressure loss due to the accumulation of radioactive dust in the dust collection filter 2 is within a predetermined value is investigated, respectively. The dust collection filter is determined to be reusable only when both the dose condition and the pressure condition are satisfied, and in other cases, the dust collection filter is determined to be non-reusable.

Next, the reusability determination processing flow by the central processing unit 7 will be described. FIG. 3 is a flowchart of the reusability determination process for the dust collection filter 2.
As shown in FIG. 2, the central processing unit 7 receives both detection data from the detector 3c and pressure data from the pressure sensor 3i. First, the central processing unit 7 obtains dose data from the detector 3c (step S1 in FIG. 3), and determines whether the dose data exceeds predetermined boundary dose data (step S2 in FIG. 3). This boundary dose data is obtained from the wave height of the background noise output when the detector 3c detects the background (natural radioactivity) and the wave height at the boundary between the wave height of the measurement target (the detection reference wave high voltage in FIG. 20B). ) To remove background noise. If the dose data does not exceed the boundary dose data (NO in step S2 in FIG. 3), the radioactivity of the radioactive dust in the dust filter 2 is low, so that the dose condition is satisfied and the process proceeds to step S3.
The central processing unit 7 acquires pressure data from the pressure sensor 3i (step S3 in FIG. 3), and determines whether or not the pressure data falls below predetermined boundary pressure data (step S4 in FIG. 3). If the pressure data does not fall below the boundary pressure data (NO in step S4 in FIG. 3), the inside of the suction case 3f is a normal vacuum by the suction pump 3b (the vacuum flows below the predetermined value due to the inflow of air from the dust collection filter 2). Since the pressure condition is satisfied, the process proceeds to step S5. The central processing unit 7 determines that it can be reused because both the dose condition and the pressure condition are satisfied (step S5 in FIG. 3), and ends the determination process.

On the other hand, if it is determined in step S2 of FIG. 3 that the dose data exceeds the boundary dose data (YES in step S2 of FIG. 3), the radioactive dust collected by the dust filter 2 is high and satisfies the dose condition. Therefore, it is determined that no further reuse is possible (step S6 in FIG. 3), and the determination process ends.
Similarly, if the pressure data falls below the predetermined boundary pressure data in step S4 in FIG. 3 (YES in step S4 in FIG. 3), a large amount of dust adheres and accumulates on the dust filter 2, and the pressure loss is excessive. Since the pressure condition is not satisfied, it is determined that further reuse is impossible (step S6 in FIG. 3), and the determination process ends.

Such determination may be performed on the dust collection filter 2 in use in the detection unit 3. By repeatedly using the dust collection filter 2 at the filter installation position in the dust collection case 3d after each predetermined period, and continuing to use while satisfying both the dose and pressure conditions, The dust collecting filter 2 can be used over a wide range and can be used efficiently.
If the detection unit 3 determines that either the dose condition or the pressure condition is no longer satisfied, the dust collection filter 2 outputs an indication that the replacement time has arrived and an audio alarm, and the dust collection filter 2 will be promoted.
If the pressure condition is no longer met, it must be replaced. If the dose condition is not met, it may be reusable due to halving of the radionuclide. Therefore, if it is determined that the dust collection filter 2 that has been used once has passed for a predetermined period, the radionuclide has been halved sufficiently, and a determination is made immediately before reuse, it can be reused. You may make it do.
Such a determination method is appropriately selected.

Next, the replacement unit 4 will be described. The replacement unit 4 is equipped with a plurality of dust collection filters 2 and replaces the non-reusable dust collection filter 2 at the filter installation position of the detection unit 3 with a new dust collection filter 2. The processing unit 7 controls the exchange unit 4 and
The dust collection filter 2 determined not to be reused is moved from the filter installation position of the detection unit 3 to another position, and the new dust collection filter 2 is moved to the filter installation position of the detection unit 3. The replacement unit 4 automatically replaces the dust collecting filter 2 so that it can be automatically operated over a long period of time without depending on the operation of a radiation worker.
At the time of replacement by the replacement unit 4, the detection unit 3 needs to be driven.
The detection unit 3 includes a dust collection case 3d on the upstream side of the dust collection filter 2 and a detector 3c, and a dust collection filter as a mechanism for fixing and releasing the dust collection filter 2 at the filter installation position. 2, a suction case 3 f on which the pressure sensor 3 i is installed, a linear slider 3 e that supports the suction case 3 f to move up and down, and a vertical movement of the suction case 3 f (arrows in FIG. 1B) And a vertical drive unit 3j for moving in the A direction). Since the suction case 3f moves up and down, it is connected to the suction pump 3b by a flexible tube or the like. In addition, the vertical drive unit 3j shown in FIG.

As shown in FIGS. 1A and 1B, the replacement unit 4 has a turn in which a filter mounting portion 4d (see FIGS. 12 and 13) is formed by a plurality of holes in which the dust collecting filter 2 is disposed. A table 4a, a support portion 4b for rotatably supporting the turntable 4a, a position indexing portion 4c for moving the filter mounting portion 4d by rotating the turntable 4a (in the direction of arrow B in FIG. 1A), and It is equipped with. As shown in FIG. 2, the central processing unit 7 is communicably connected to the position indexing unit 4 c of the exchange unit 4.
Then, drive control of the detection unit 3 and the replacement unit 4 is performed based on the determination result of reuse.

Next, replacement by the replacement unit 4 that works in conjunction with the detection unit 3 will be described with reference to the drawings. 4 is an explanatory view of the detection unit 3 in which the dust collection filter 2 is attached to the filter installation position, FIG. 5 is an explanatory view of the detection unit 3 in which the dust collection filter 2 is released from the filter installation position, and FIG. It is explanatory drawing of the detection unit 3 inside.
Before the removal of the dust collecting filter 2 from the detection unit 3, the suction case 3f is raised as shown in FIG. 4, but the central processing unit 7 drives the motor and speed reducer of the vertical drive unit 3j. By controlling, as shown in FIG. 5, the suction case 3f is lowered (in the direction of arrow C in FIG. 5), and the filter 2 is placed on the filter mounting portion 4d (FIG. 12, FIG. 12), which is the hole of the turntable 4a. 13) only. The outer peripheral surface of the dust collection filter 2 is formed in multiple stages, and the upper stage is in contact with the peripheral edge of the filter mounting portion 4d so as not to fall.

Subsequently, as shown in FIG. 5, the turntable 4a is rotated by controlling the central processing unit 7 to drive the motor and the speed reducer of the position indexing unit 4c with the suction case 3f lowered. A new dust collection filter 2 is positioned at the filter installation position of the detection unit 3. Subsequently, when the dust collecting filter 2 is attached to the detection unit 3, the central processing unit 7 is controlled so as to drive the motor and the speed reducer of the vertical drive unit 3j. As shown in FIG. Is raised (in the direction of arrow D in FIG. 6), the dust collecting filter 3 is sandwiched between the dust collecting case 3d and the suction case 3f, and the dust collecting filter 3 is sealed and fixed. At this time, since the dust collecting filter 2 is sandwiched between the seal of the dust collecting case 3d and the seal of the suction case 3f, air does not leak.
Then, as shown in FIG. 6, the central processing unit 7 starts the dust collection by operating the suction pump 3b. The exchange is performed in this way.
The dust monitor 1 of the present embodiment is like this.
The dust collection filter 2 that has been used once is placed on the turntable 4a as it is. After the dust collection filter 2 that has been used once has passed for a predetermined period of time, the radionuclide has been halved sufficiently, and then the detection unit 3 If it is determined that it can be reused by making a similar determination when it is installed again, it can be used for a longer period of time.

Next, another embodiment will be described with reference to the drawings. FIG. 7 is a configuration diagram of another form of the dust monitor 1 ′, FIG. 7 (a) is a plan view, and FIG. 7 (b) is a cross-sectional view. Compared with the previous embodiment, the dust collecting filter 2, the replacement unit 4, the operation unit 5, and the base unit 6 have the same configuration but are compared with the detection unit 3 because the detection unit 3 ′ has a purge function. Thus, the detection unit 3 ′ is different in that a configuration is added. This added configuration and purge function will be described, and the others will be assigned the same reference numerals and have the same configuration, and redundant description will be omitted as performing the same processing.
In addition to the configuration of the detection unit 3, the detection unit 3 ′ further includes a first valve 3k, a second valve 3l, and a purge filter 3m.

In the purge function, the inside of the flow path such as the dust collecting case 3d and the suction case 3f of the detection unit 3 ′ is sufficiently vacuumed to dry the inside of the flow path to remove moisture (humidity) in the flow path, thereby removing the suction pump 3b. Is to protect.
Such an air purge will be outlined. First, the first valve 3k is closed electrically and manually to stop the inflow of air from the suction port 3a. Then, the second valve 3l is opened electrically and manually to pass through the purge filter 3m so that a small amount of sufficiently dry air without dust can be introduced. In this state, vacuuming is performed by the suction pump 3b to perform air purge. After the air purge is completed, the second valve 3l is closed and the first valve 3k is opened to start the detection described above. The air purge may be performed periodically.
In the dust monitor 1 ′ configured as described above, the protection function of the detection unit 3 ′ can be enhanced.

  Next, another modified embodiment will be described with reference to the drawings. 8A and 8B are configuration diagrams of another form of the dust monitor 10, in which FIG. 8A is a plan view and FIG. 8B is a cross-sectional view. FIG. 9 is a circuit block diagram of the dust monitor 10 according to another embodiment. Compared with the previous embodiment, the dust collection filter 2, the detection unit 3, the replacement unit 4, the operation unit 5, and the base unit 6 have the same configuration, but in order to provide a continuous automatic replacement function, the discharge unit 8, The difference is that a supply unit 9 is added. Only the added discharge unit 8, the supply unit 9, and the configuration / operation of these units will be described, and the other components will be denoted by the same reference numerals and the same configuration / processing will be omitted.

  The discharge unit 8 discharges the dust collection filter 2 from the replacement unit 4, and the central processing unit 7 moves the dust collection filter 2 determined not to be reusable to the filter discharge position of the discharge unit 8. Thus, the replacement unit 4 is controlled, and the discharge unit 8 is controlled so that the non-reusable dust collection filter 2 at the filter discharge position is discharged from the replacement unit 4.

As shown in FIGS. 8 (a) and 8 (b), the discharge unit 8 has a rod 8a that is configured to move in the horizontal direction and sweeps out the dust collecting filter 2 at the filter discharge position, and a rod 8a. A rod driving unit 8b that is driven in the horizontal direction and a stocker 8c that accommodates the discharged dust collecting filter 2 as a waste filter 8d are provided. Further, as shown in FIGS. 10, 11, and 12, a push-up portion 8f that pushes up the dust collecting filter 2 mounted on the filter mounting portion 4d of the turntable 4a, and the push-up portion 8f are supported so as to be movable in the vertical direction. A linear slider 8e and a push-up unit drive unit 8g that drives the push-up unit 8f in the vertical direction are provided.
Further, as shown in FIG. 9, the circuit block includes a central processing unit 7, an operation unit 5a, a display unit 5b, a detector 3c, a suction pump 3b, a pressure sensor 3i, a vertical drive unit 3j, a position indexing unit 4c, The rod drive unit 8b and the hand drive unit 9b are connected.

Next, the discharge by the discharge unit 8 interlocked with the detection unit 3 will be described with reference to the drawings. FIG. 10 is an explanatory diagram of the state before the dust collection filter 2 is pushed up, FIG. 10 (a) is a plan view of the main part, and FIG. 10 (b) is a cross-sectional view of the main part. FIG. 11 is an explanatory diagram of the state after the dust collection filter 2 is pushed up, in which FIG. 11 (a) is a plan view of relevant parts and FIG. 11 (b) is a cross-sectional view of relevant parts. FIG. 12 is an explanatory view of the discharge of the dust collecting filter 2, FIG. 12 (a) is a main part plan view, and FIG. 12 (b) is a main part sectional view.
Assume that the detection unit 3 determines that the dust collection filter 2 is not reusable. The central processing unit 7 lowers the suction case 3f as shown in FIG. 5, and then controls the position indexing unit 4c to rotate the turntable 4a (in the direction of arrow E in FIG. 10A). As shown by 10 (a), the dust collection filter 2 to be discarded is positioned at the filter discharge position.
Then, the central processing unit 7 controls the push-up unit drive unit 8g to raise the push-up unit 8f (in the direction of arrow F in FIG. 11B), and as shown in FIG. 11B, the dust collecting filter 2 Is pushed up from the filter mounting portion 4d of the turntable 4a. When the push-up is completed, the top of the push-up portion 8f is substantially the same height as the turntable 4a, and the dust collecting filter 2 can move horizontally.
The central processing unit 7 controls the rod driving unit 8b to start the movement of the rod 8a, and sweeps out the dust collecting filter 2 in the horizontal direction (the direction of arrow G in FIG. 12A) as shown in FIG. Then, the filter is moved from the filter discharge position to the stocker 8c. As a result, the dust collecting filter 2 is dropped to the stocker 8c to become the waste filter 8d, and the discharge is completed. Then, the push-up portion 8f is lowered so that the turntable 4a can be rotated. The filter table 4d, which is a hole, remains on the turntable 4a.

Next, the supply unit 9 will be described.
The supply unit 9 supplies a new dust collection filter 2 to the filter mounting part 4d of the replacement unit 4 from which the non-reusable dust collection filter 2 has been discharged. Is controlled to move the filter mounting part 4d to the filter supply position of the supply unit 9, and then the supply unit 9 is controlled to supply a new dust collecting filter 2 to the filter mounting part 4d of the replacement unit 4. That's it.

As shown in FIGS. 8A and 8B, such a supply unit 9 moves in the horizontal direction with a stocker 9a that houses a supply filter 9d in which a plurality of unused dust collection filters 2 are stacked. A hand 9c that pushes the dust collecting filter 2 to the filter mounting part 4d of the turntable 4a and is supported so as to be able to drive the hand 9c in the horizontal direction.
The circuit block uses the central processing unit 7 and the hand driving unit 9b in FIG.

Next, discharge by the discharge unit 8 interlocked with the detection unit 3 and the replacement unit 4 will be described with reference to the drawings. FIG. 13 is an explanatory diagram of a state before the dust collection filter 2 is supplied. FIG. 13A is a plan view of the main part, and FIG. 13B is a cross-sectional view of the main part. FIG. 14 is an explanatory diagram of the state during the supply of the dust collecting filter 2, FIG. 14 (a) is a plan view of the main part, and FIG. 14 (b) is a cross-sectional view of the main part. 15A and 15B are explanatory views of the state when the supply of the dust collecting filter 2 is completed. FIG. 15A is a plan view of the main part, and FIG. 15B is a cross-sectional view of the main part. 16A and 16B are explanatory views of the state after the supply of the dust collecting filter 2 is completed. FIG. 16A is a plan view of the main part, and FIG. 16B is a cross-sectional view of the main part.
It is assumed that the dust collecting filter 2 is determined to be unusable by the detection unit 3 and discharged. The central processing unit 7 lowers the suction case 3f as shown in FIG. 5, and then controls the position indexing unit 4c of the replacement unit 4 to rotate the turntable 4a (arrow H in FIG. 13A). Direction), and as shown in FIGS. 13A and 13B, the filter mounting portion 4d of the turntable 4a is positioned at the filter supply position.
The central processing unit 7 controls the hand drive unit 9b to push the hand 9c forward (in the direction of arrow i in FIGS. 14A and 14B) as shown in FIGS. As shown in FIGS. 15 (a) and 15 (b), the lowermost one of the supply filters 9d in 9a is moved to the filter mounting portion 4d side of the turntable 4a. Drop into the filter placement section 4d and load. As a result, the supply ends. Then, the central processing unit 7 controls the hand driving unit 9b to return the hand 9c to the rear side (in the direction of arrow j in FIG. 16B) as shown in FIGS. The next dust collection filter 2 of the supply filter 9d in 9a is dropped to the lower side and the next supply is waited.

Next, a processing flow by the central processing unit 7 for reusability determination in consideration of the discharge / supply will be described. FIG. 17 is a flowchart of the reusability determination process for the dust collection filter 2.
As shown in FIG. 9, both the pressure data from the pressure sensor 3 i and the detection data from the detector 3 c are input to the central processing unit 7. First, the central processing unit 7 acquires dose data from the detector 3c (step S11 in FIG. 17), and determines whether the dose data exceeds predetermined boundary dose data (step S12 in FIG. 17). If the dose data does not exceed the boundary dose data (NO in step S12 of FIG. 17), the radioactivity of the radioactive dust in the dust filter 2 is low, so that the dose condition is satisfied and the process proceeds to step S13.
The central processing unit 7 acquires pressure data from the pressure sensor 3i (step S13 in FIG. 17), and determines whether or not the pressure data falls below predetermined boundary pressure data (step S14 in FIG. 17). If the pressure data does not fall below the predetermined boundary pressure data (NO in step S14 in FIG. 17), the process proceeds to step S15 assuming that the pressure condition is satisfied. The central processing unit 7 determines that reuse is possible because both the dose condition and the pressure condition are satisfied (step S15 in FIG. 17), and the determination process ends.

On the other hand, if it is determined in step S12 of FIG. 17 that the dose data exceeds the boundary dose data (YES in step S12 of FIG. 17), the radioactive activity collected by the dust filter 2 is high and the dose condition is set. Since it does not satisfy, it is determined that no further use is possible (step S16 in FIG. 17).
Similarly, if the pressure data falls below the predetermined boundary pressure data in step S14 of FIG. 17 (YES in step S14 of FIG. 17), a large amount of dust adheres and accumulates on the dust filter 2, and the pressure loss is excessive. Since the certain pressure condition is not satisfied, it is determined that no further use is possible (step S16 in FIG. 17).

  In order to discharge the dust collecting filter 2 determined not to be reused, the turntable 4a is rotated and moved to the filter discharge position of the discharge unit 8 (step S17 in FIG. 17). Thus, the dust collecting filter 2 is discarded (step S18 in FIG. 17). Then, the turntable 4a is rotated and moved to the filter supply position of the supply unit 9 (step S19 in FIG. 17), and a new dust collection filter 2 is supplied by the above-described operation by the supply unit 9 (step in FIG. 17). S20). Note that steps S19 and S20 do not need to be performed immediately, and even after the dust collection filter 2 is discarded by the detection unit 3 / discharge unit 8, if the priority is placed on the detection unit 3, the turntable 4a cannot be moved immediately. Move over time. Therefore, the supply may be waited until the filter supply position of the supply unit 8 is reached, and the supply may be performed when the filter mounting portion 4d comes to the filter supply position of the supply unit 8. In this case, although the filter mounting portion 4d is open for a long time, the dust monitor 10 itself is covered with a dustproof cover (not shown) or the like, and there is no possibility that dust or the like enters.

Subsequently, a modified form will be described with reference to the drawings. 18A and 18B are configuration diagrams of another form of the dust monitor 10 ', in which FIG. 18A is a plan view and FIG. 18B is a cross-sectional view. Compared to the previous embodiment, the dust collection filter 2, the replacement unit 4, the operation unit 5, the base unit 6, the discharge unit 8, and the supply unit 9 have the same configuration, but have a purge function instead of the detection unit 3. The difference is that the detected unit 3 ′ is adopted. Note that the added configuration and purge function are the same as those described above, and the same reference numerals are used, and redundant description is omitted assuming that the same configuration and processing are performed.
The dust monitor 10 ′ may have such a configuration.

The various forms of the present invention have been described above.
In this embodiment, the dust monitor is described as a specific example of the dust collector. However, the dust monitor is not limited to the dust monitor. For example, the dust collector is not limited to the dust monitor. You may apply to a dust device.

It is a block diagram of the dust monitor of the best form for implementing this invention, Fig.1 (a) is a top view, FIG.1 (b) is sectional drawing. It is a circuit block diagram of the dust monitor of the best mode for carrying out the present invention. It is a flowchart of the reusability determination process of the filter for dust collection. It is explanatory drawing of the detection unit with which the filter for dust collection was attached to the filter installation position. It is explanatory drawing of the detection unit with which the filter for dust collection was open | released from the filter installation position. It is explanatory drawing of the detection unit in use. It is a block diagram of the dust monitor of another form, Fig.7 (a) is a top view, FIG.7 (b) is sectional drawing. It is a block diagram of the dust monitor of another form, Fig.8 (a) is a top view, FIG.8 (b) is sectional drawing. It is a circuit block diagram of the dust monitor of other forms. FIGS. 10A and 10B are explanatory views of a state before the dust collection filter is pushed up, in which FIG. 10A is a plan view of a main part, and FIG. It is explanatory drawing of the state after pushing up the filter for dust collection, Fig.11 (a) is a principal part top view, FIG.11 (b) is principal part sectional drawing. FIG. 12A is an explanatory plan view of a main part, and FIG. 12B is a cross-sectional view of the main part. FIGS. 13A and 13B are explanatory views of the state before the dust collection filter is supplied, in which FIG. 13A is a plan view of the main part and FIG. FIG. 14A is a plan view of a main part, and FIG. 14B is a cross-sectional view of a main part. FIG. 15A is a plan view of a main part, and FIG. 15B is a cross-sectional view of a main part. FIGS. 16A and 16B are explanatory views of the state after the supply of the dust collecting filter is completed, in which FIG. 16A is a plan view of a relevant part and FIG. It is a flowchart of the reusability determination process of the filter for dust collection. It is a block diagram of the dust monitor of another form, Fig.18 (a) is a top view, FIG.18 (b) is sectional drawing. It is a block diagram of the detection unit of the dust monitor of a prior art. 20A and 20B are explanatory diagrams of the detector, in which FIG. 20A is a main part configuration diagram, and FIG. 20B is a count value-wave high voltage line characteristic diagram.

Explanation of symbols

1, 1 ', 10, 10': Dust monitor 2: Dust collection filter 3: Detection unit 3a: Suction port 3b: Suction pump 3c: Detector 3d: Dust collection case 3e: Linear slider 3f: Suction case 3g: Exhaust Outlet 3h: Flow path 3i: Pressure sensor 3j: Vertical drive unit 3k: First valve 3l: Second valve 3m: Purge filter 4: Replacement unit 4a: Turntable 4b: Support unit 4c: Position indexing unit 4d: Filter Placement unit 5: operation unit 5a: operation unit 5b: display unit 6: base unit 7: central processing unit 8: discharge unit 8a: rod 8b: rod drive unit 8c: stocker 8d: waste filter 8e: linear slider 8f: push-up Unit 8g: push-up unit drive unit 9: supply unit 9a: stocker 9b: hand drive unit 9c: hand 9d: supply filter

Claims (4)

A dust collector that collects radioactive dust by passing the air of a radioactive isotope handling facility through a cartridge-type dust filter ,
A dust collection filter is installed at the filter installation position, and a detector that outputs dose data according to the radiation dose from the radioactive dust collected by the dust collection filter and the pressure downstream of this dust collection filter A pressure sensor that measures and outputs pressure data ; and a detection unit having at least
Replacement that replaces the dust collection filter that is determined as non-reusable at the filter installation position of the detection unit with a new dust collection filter. Unit,
A discharge unit for discharging the dust collection filter determined to be non-reusable from the replacement unit;
A supply unit for supplying a new dust collection filter to the filter mounting portion of the replacement unit from which the dust collection filter determined to be non-reusable is discharged;
The dose data from the detector and the pressure data from the pressure sensor are input to determine whether or not reuse is possible, and the drive control of the replacement unit, the discharge unit, and the supply unit is performed based on the determination result of whether or not reuse is possible. A central processing unit for performing
The provided, the central processing unit further
It is installed in the filter installation position of the detection unit, the dust collection filter to be determined for reusability, if below the boundary dose data dose data is predetermined radioactive dust of dust-collecting filter radioactivity examine each and dose conditions that low, and the pressure conditions the pressure loss due to deposition of radioactive dust of dust-collecting filter if above the boundary pressure data is pressure data predetermined is to be within a predetermined value, the Means,
Only when these dose conditions and pressure conditions are satisfied, the dust collection filter that is subject to determination of reuse is determined to be reusable, and in other cases, the dust collection filter is determined to be non-reusable,
Means for controlling the replacement unit to move the dust collection filter determined to be non-reusable from the filter installation position of the detection unit to the filter discharge position of the discharge unit;
Means for controlling the discharge unit so as to discharge the dust collection filter determined to be non-reusable at the filter discharge position from the replacement unit;
Means for controlling the replacement unit so that the filter mounting portion from which the dust collection filter determined to be non-reusable is discharged moves to the filter supply position of the supply unit;
Means for controlling the supply unit to supply a new filter for collecting dust to the filter mounting portion of the moved replacement unit;
Means for controlling the replacement unit to move the next dust collection filter to the filter installation position of the detection unit ;
A dust collector characterized by comprising. The dust collector according to claim 1,
The detection unit is a dust collection case on the upstream side of the dust collection filter and the detector is installed; a suction case on the downstream side of the dust collection filter and the pressure sensor is installed; An up-and-down drive unit that moves the suction case up and down;
The replacement unit includes a turntable on which a filter mounting portion is formed by a plurality of holes that are rotatably supported and in which the filter for dust collection is disposed, and the filter mounting portion by rotating the turntable. A position indexing unit for moving
The central processing unit is
When removing the dust collection filter that has been determined to be non-reusable from the detection unit, the suction case is lowered to support the dust collection filter only by the filter mounting portion of the turntable. And controlling the vertical drive unit of the detection unit to rotate the turntable so that the dust collection filter determined not to be reused from the filter installation position of the detection unit to the filter discharge position of the discharge unit Means for controlling the position indexing portion of the exchange unit to move;
When the new dust collection filter is attached to the detection unit, the position table of the replacement unit is arranged so that the turntable is rotated and the new dust collection filter is positioned at the filter installation position of the detection unit. The vertical drive unit of the detection unit is controlled so as to control the exit portion and raise the suction case so that the dust collection case and the suction case are clamped to seal and fix a new dust collection filter. Means,
Dust collector, characterized in that it comprises a. The dust collector according to claim 2, wherein
The discharge unit is supported so as to be movable in the vertical direction, and pushes up a dust collecting filter that is determined to be non-reusable and is mounted on the filter mounting portion of the turntable. A push-up unit drive unit that is driven in the direction, a rod that is configured to be movable in the horizontal direction and that sweeps out the dust collecting filter that is determined to be non-reusable at the filter discharge position, and is driven and discharged in the horizontal direction. And a stocker for storing the dust collection filter determined to be non-reusable after discharging,
The central processing unit is
In order to discharge the filter for dust collection determined to be non-reusable at the filter discharge position from the replacement unit,
Means for controlling the position indexing portion of the replacement unit to rotate the turntable and position the filter for dust collection determined to be non-reusable at the filter discharge position;
Means for controlling the push-up unit drive unit of the discharge unit so as to push up the dust collecting filter determined to be unusable by raising the push-up unit from the filter placement unit of the turntable;
Means for controlling the rod drive part of the discharge unit to move the rod to sweep out the dust collecting filter at the filter discharge position determined to be non-reusable to the stocker ;
A dust collector characterized by comprising. The dust collector according to claim 3,
The supply unit includes a stocker that accommodates a new dust collection filter, and a hand that is supported so as to be movable in the horizontal direction and pushes a new dust collection filter from the stocker to the filter placement portion of the turntable; A hand drive unit for driving the hand in the horizontal direction,
The central processing unit is
In order to supply a new dust collecting filter to the filter mounting portion of the replacement unit from which the dust collecting filter determined to be non-reusable has been discharged,
Means for controlling the position indexing portion of the replacement unit to rotate the turntable to position the filter mounting portion of the turntable at a filter supply position;
The hand driving unit of the supply unit is loaded so that the filter mounting unit of the turntable is loaded with one new dust collecting filter in the stocker that pushes out the hand and accommodates a new dust collecting filter. Means for controlling;
A dust collector characterized by comprising .

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