Multiple redundant safety interlock control system and liquid scintillation counter

Abstract

The embodiment of the application discloses a multiple-redundancy safety interlocking control system and a liquid scintillation counter; the system comprises a lead chamber push door, a lead chamber push door slide, a lead chamber push door traction rod connected with the lead chamber push door and used for traction of the lead chamber push door movement, a fixed plate corresponding to the lead chamber push door, a lead chamber push door driving assembly installed on the fixed plate and used for driving the lead chamber push door traction rod, a first photoelectric switch assembly and a second photoelectric switch assembly; the control logic is as follows: if the lead chamber push door is closed, the first photoelectric switch assembly is turned on, and "1" is input to the "and" gate logic circuit of the control relay; the control assembly receives the power-on instruction of the photoelectric detector, detects that the second photoelectric switch assembly is turned on, inputs "1" to the "and" gate logic circuit, the output of the "and" gate logic circuit is "1" at this time, the relay is turned on, and the photoelectric detector is powered on; if the photoelectric detector power-on instruction is accidentally issued, the lead chamber push door is not closed, the second photoelectric switch assembly is not turned on, and the power-on instruction is not executed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of radiation detection, and particularly relates to a multiple-redundancy safety interlock control system and a liquid scintillation counter. BACKGROUND

[0002] In nuclear and radiation emergency monitoring, samples in suspected contaminated areas need to be collected, processed and analyzed for radionuclides. Some liquid transmission pipelines and storage facilities in nuclear facilities also need to be checked and monitored on site to monitor their operating status. The environmental samples collected in these places usually have small activity and large quantity, so a liquid scintillation counter with good stability and small sample counting interference is needed for measurement. A stable and reliable lead chamber push door control device is usually required for a liquid scintillation spectrometer to ensure that the counting chamber is strictly light-proof during operation to ensure the accuracy of scintillation counting.

[0003] The measurement process of a liquid scintillation spectrometer is to dissolve radioactive samples in scintillation liquid. The radioactive substances dispersed or suspended in the scintillation liquid are in close contact with the scintillation liquid, and the geometric condition is close to 4π. There is almost no influence of sample self-absorption, scattering and geometric condition, so the measurement accuracy and efficiency are greatly improved, and it is often used for low-activity sample measurement. During the operation of the liquid scintillation spectrometer, the automatic lead chamber push door switch is used to take and place samples. During counting, the lead chamber push door is in a closed state to provide a strictly light-proof operating environment for the counting system and shield environmental radiation. The light-proof counting chamber also protects the photomultiplier tube. As a precision detection device, the photomultiplier tube is very sensitive to environmental factors.

[0004] The counting chamber of the current liquid scintillation spectrometer is wrapped in a metal shell, and only the lead door can be opened or closed for the mechanical gripper to place the sample. When the device is started, it is difficult for the operator to ensure whether the counting chamber is strictly light-proof. If the lead door is not closed when the device is running, environmental light will enter the counting chamber, causing the sample count rate to be too high, and in severe cases, the photomultiplier tube will be damaged, further causing the liquid scintillation counter to be damaged. The current liquid scintillation counter has the risk of light leakage at the lead door, and lacks protection for the counting system and security for the operation of the device. SUMMARY

[0005] Therefore, in one aspect, some embodiments disclose a multiple-redundancy safety interlock control system applied to a liquid scintillation counter, the control system comprising:

[0006] a lead chamber push door for closing an opening of a counting measurement chamber of the liquid scintillation counter;

[0007] a lead chamber push door slide, the lead chamber push door slide being in a U-shaped structure, an outer edge portion of the U-shaped structure being fixedly connected with a structure body of the liquid scintillation counter, and an inner edge portion of the U-shaped structure having a shape adapted to the lead chamber push door for slidably connecting with the lead chamber push door;

[0008] The lead chamber door pushing and pulling rod is arranged in connection with the lead chamber door pushing and pulling rod and is used for pulling the lead chamber door pushing and pulling rod to move.

[0009] The fixed plate is arranged in correspondence with the lead chamber door pushing and pulling rod, and a through hole is arranged on the fixed plate. The lead chamber door pushing and pulling rod is arranged to pass through the through hole.

[0010] The lead chamber door pushing and pulling rod is arranged in connection with the lead chamber door pushing and pulling rod and is used for pulling the lead chamber door pushing and pulling rod to move.

[0011] The first photoelectric switch assembly is arranged in correspondence with the lead chamber door pushing and pulling rod and the fixed plate, and is used for sensing the opening and closing of the lead chamber door pushing and pulling rod.

[0012] The second photoelectric switch assembly is arranged in correspondence with the lead chamber door pushing and pulling rod and the fixed plate, and is used for sensing the opening and closing of the lead chamber door pushing and pulling rod.

[0013] The first photoelectric switch assembly is arranged in connection with one input of the AND gate logic circuit. The output of the AND gate logic circuit is arranged in connection with the relay. The relay is used for controlling the photoelectric detector of the liquid scintillation analyzer. The second photoelectric switch assembly is arranged in connection with the control assembly of the liquid scintillation analyzer. The control assembly of the liquid scintillation analyzer is arranged in connection with the other input of the AND gate logic circuit. The control logic of the first photoelectric switch assembly and the second photoelectric switch assembly is as follows:

[0014] If the lead chamber door pushing and pulling rod has been closed, the first photoelectric switch assembly is turned on, and the AND gate logic circuit for controlling the relay inputs "1". The control assembly of the liquid scintillation analyzer receives the power-on command of the photoelectric detector and detects that the second photoelectric switch assembly is turned on, and inputs "1" to the AND gate logic circuit. At this time, the output of the AND gate logic circuit is "1", the relay is turned on, and the photoelectric detector is powered on.

[0015] If the user accidentally issues a photoelectric detector power-on command, if the lead chamber door pushing and pulling rod is not closed at this time, and the second photoelectric switch assembly is not turned on, the photoelectric detector power-on command is not executed.

[0016] Further, some embodiments disclose a multiple-redundancy interlocking control system. The outer edge of the lead chamber door pushing and pulling rod is sequentially provided with a plurality of fixing members for being fixed to the structure of the liquid scintillation analyzer.

[0017] Some embodiments disclose a multiple-redundancy interlocking control system. The lead chamber door pushing and pulling rod driving assembly comprises:

[0018] The rotating gear is arranged at the end of the lead chamber door pushing and pulling rod.

[0019] The driving gear is arranged on the fixed plate. The rotating gear and the driving gear are arranged in connection through the track.

[0020] The driving motor is arranged in connection with the driving gear and is used for driving the driving gear to rotate.

[0021] Some embodiments of the multiple-redundancy interlocking control system, the first photoelectric switch assembly is arranged in parallel with the second photoelectric switch assembly.

[0022] Some embodiments of the multiple-redundancy interlocking control system, the first photoelectric switch assembly comprises:

[0023] The first photoelectric switch is arranged and installed on the fixed plate.

[0024] The first latch is arranged and installed at the end of the lead chamber push door and corresponds to the first photoelectric switch.

[0025] Some embodiments of the multiple-redundancy interlocking control system, the second photoelectric switch assembly comprises:

[0026] The second photoelectric switch is arranged and installed on the fixed plate.

[0027] The second latch is arranged and installed at the end of the lead chamber push door and corresponds to the second photoelectric switch.

[0028] Some embodiments of the multiple-redundancy interlocking control system, the lead chamber push door pulling rod is threadedly rotatably connected with the lead chamber push door.

[0029] Some embodiments of the multiple-redundancy interlocking control system, the liquid scintillation analyzer structure body comprises a lead shielding body.

[0030] Some embodiments of the multiple-redundancy interlocking control system, the lead chamber push door slide is a metal material integrally formed structure.

[0031] In another aspect, some embodiments of the liquid scintillation analyzer are disclosed, wherein the liquid scintillation analyzer is arranged and installed with the multiple-redundancy interlocking control system.

[0032] The multiple-redundancy interlocking control system disclosed in the embodiments of the present application is applied to a liquid scintillation analyzer, and the first photoelectric switch assembly and the second photoelectric switch control assembly are arranged and independently controlled, independently operate, and do not interfere with each other, so that the photoelectric detector of the liquid scintillation analyzer can be prevented from being accidentally powered on, the counting measurement chamber of the liquid scintillation analyzer can be detected only in the dark, and the use safety of the liquid scintillation analyzer is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Some embodiments of the multiple-redundancy safety interlocking control system composition schematic Figure One ;

[0034] Figure 2 Some embodiments of the multiple-redundancy safety interlocking control system composition schematic Figure Two ;

[0035] Figure 3 Some embodiments of the lead chamber push door control method flow chart.

[0036] Reference signs

[0037] 1 lead room push door 2 lead room push door slide

[0038] 3 lead room push door traction rod 4 fixed plate

[0039] 5 lead room push door drive assembly 6 first photoelectric switch assembly

[0040] 7 second photoelectric switch assembly 21 fixing member

[0041] 51 rotating gear 52 track

[0042] 53 drive gear 54 drive motor

[0043] 61 first photoelectric switch 62 first bolt

[0044] 71 second photoelectric switch 72 second bolt DETAILED DESCRIPTION

[0045] Herein the term "embodiment" is used as "exemplary" to any embodiment described, and is not necessarily construed as a preference or a betterment over other embodiments. The performance index test in the embodiments of the present application is carried out by using the conventional test method in the art, unless otherwise specified. It should be understood that the terms described in the embodiments of the present application are merely for the description of the particular embodiments, and are not intended to limit the disclosure of the embodiments of the present application.

[0046] Unless otherwise specified, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the embodiments of the present application belong; and the test methods and technical means not specifically noted in the embodiments of the present application refer to the experimental methods and technical means commonly used by those skilled in the art.

[0047] The terms "substantial" and "approximately" as used herein are used in relation to small fluctuations. For example, they can mean less than or equal to ± 5%, such as less than or equal to ± 2%, such as less than or equal to ± 1%, such as less than or equal to ± 0.5%, such as less than or equal to ± 0.2%, such as less than or equal to ± 0.1%, such as less than or equal to ± 0.05%. Numerical data may, in some instances, be presented in a range format. It is to be understood that such a range format is used only for convenience and brevity and thus should be taken as a recitation only of the specific data points explicitly enumerated as the upper and lower bounds of the range. However, all intervening data points, as well as all sub-ranges included in the data set presented are considered to be incorporated in their entirety into this disclosure. For example, a range of "1 to 5% " should be interpreted to include not only the explicitly recited values of 1% to 5%, but also the sub-ranges (and all individual values therein) of 2 to 4%, 3 to 4.5%, and 3.5 to 4.9%, etc. It will be further understood that all references to a particular parameter or parameter range are to be interpreted in the same manner. In other words, all references to specific parameters and / or parameter ranges are understood to serve only as examples based on the explicit example points, and not as a limitation of the scope of the disclosure.

[0048] In this document, including in the claims, the conjunctions, such as "comprise", "include", "have", "with", "contain", "involve", "accommodate" and the like are to be understood as open-ended, i.e. as meaning "including but not limited to". Only the conjunctions "consist of" and "consist only of" are closed conjunctions.

[0049] For a better understanding of the present application, numerous specific details are given in the following embodiments. It will be understood by those skilled in the art that the present application can be practiced without some of the specific details. In the embodiments, some methods, means, instruments, devices, etc. well known to those skilled in the art are not described in detail in order to highlight the principles of the present application.

[0050] The technical features disclosed in the embodiments of the present application can be combined in any manner without conflict, and the technical solutions obtained by the combination belong to the disclosure of the present application.

[0051] In some embodiments, as shown in the examples of Figure 1 , Figure 2 A multiple-redundancy safety interlock control system for a liquid scintillation counter includes:

[0052] A lead chamber push door 1 for closing a counting chamber opening of the liquid scintillation counter;

[0053] A lead chamber push door slide 2; the lead chamber push door slide 2 has a U-shaped structure; an outer edge portion of the U-shaped structure is fixedly connected with a structure body of the liquid scintillation counter, and an inner edge portion of the U-shaped structure has a shape matched with the lead chamber push door, for slidably connecting with the lead chamber push door 1; the outer edge portion of the lead chamber push door slide 2 is sequentially provided with a plurality of fixing members 21, for fixing with the structure body of the liquid scintillation counter;

[0054] A lead chamber door pushing and pulling rod 3 is arranged in connection with the lead chamber door 1 and is used to pull the lead chamber door 1 to move;

[0055] A fixed plate 4 is arranged in correspondence with the lead chamber door 1, the fixed plate 4 is provided with a through hole, and the lead chamber door pushing and pulling rod is arranged to pass through the through hole;

[0056] A lead chamber door driving assembly 5 is arranged and installed on the fixed plate 1 and is connected with the lead chamber door pushing and pulling rod 3 and is used to drive the lead chamber door pushing and pulling rod 3; wherein the lead chamber door driving assembly 5 comprises: a rotating gear 51 arranged and installed at the end of the lead chamber door pushing and pulling rod 3; a driving gear 53 arranged and installed on the fixed plate 4, the rotating gear 51 is connected with the driving gear 53 through a track 52; a driving motor 54 is arranged and connected with the driving gear 53 and is used to drive the driving gear 53 to rotate;

[0057] A first photoelectric switch assembly 6 is arranged and installed in correspondence with the lead chamber door 1 and the fixed plate 4 and is used to sense the opening and closing of the lead chamber door 1; wherein the first photoelectric switch assembly comprises a first photoelectric switch 61 arranged and installed on the fixed plate 5; a first bolt 62 is arranged and installed at the end of the lead chamber door 1 and corresponds to the first photoelectric switch 61;

[0058] A second photoelectric switch assembly 7 is arranged and installed in correspondence with the lead chamber door 1 and the fixed plate 4 and is used to sense the opening and closing of the lead chamber door 1; wherein the second photoelectric switch assembly comprises: a second photoelectric switch 71 arranged and installed on the fixed plate; a second bolt 72 is arranged and installed at the end of the lead chamber door 1 and corresponds to the second photoelectric switch 71;

[0059] Wherein, the first photoelectric switch assembly 6 is arranged and connected with one input of the AND gate logic circuit, the output of the AND gate logic circuit is arranged and connected with a relay, and the relay is used to control the photoelectric detector of the liquid scintillation analyzer; the second photoelectric switch assembly 7 is arranged and connected with the control assembly of the liquid scintillation analyzer, and the control assembly of the liquid scintillation analyzer is arranged and connected with another input of the AND gate logic circuit;

[0060] In some embodiments, the control assembly comprises a single-chip microcomputer;

[0061] In some embodiments, the structure of the liquid scintillation analyzer comprises a lead shielding body;

[0062] The control logic of the first photoelectric switch assembly 6 and the second photoelectric switch assembly 7 is as follows:

[0063] If the lead chamber door 1 has been closed, the first photoelectric switch assembly 6 is turned on, the AND gate logic circuit for controlling the relay inputs "1", the control assembly of the liquid scintillation analyzer receives the power-on command on the photoelectric detector, and detects that the second photoelectric switch assembly 7 is turned on, inputs "1" to the AND gate logic circuit, at this time, the output of the AND gate logic circuit is "1", the relay is turned on, and the photoelectric detector is powered on;

[0064] If the user accidentally issues the photodetector power-on instruction, if the lead chamber push door 1 is not closed at this time, and the second photointerrupter assembly 7 is not turned on, the photodetector power-on instruction is not executed.

[0065] Some embodiments disclose a multiple-redundancy interlocking control system, and the first photointerrupter assembly and the second photointerrupter assembly are arranged in parallel.

[0066] Some embodiments disclose a multiple-redundancy interlocking control system, and the lead chamber push door pulling rod and the lead chamber push door are threadedly rotatably connected.

[0067] Some embodiments disclose a multiple-redundancy interlocking control system, and the lead chamber push door slide is a metal one-piece structure.

[0068] Some embodiments disclose a liquid scintillation analyzer, and the liquid scintillation analyzer is provided with the multiple-redundancy interlocking control system.

[0069] The liquid scintillation analyzer is provided with multiple-redundancy interlocking control systems, and the control method of the lead chamber push door includes:

[0070] (1) The driving motor 54 drives the driving gear 53 to rotate, the track 52 drives the rotating gear 51 to rotate, the lead chamber push door pulling rod 3 rotates under the drive of the rotating gear 51, the lead chamber push door 1 moves towards the fixed plate 4, until the lead chamber push door 1 reaches the set position, at this time, the lead chamber push door 1 is in a fully open state, the first pin 62 enters the first photointerrupter 61, the first photointerrupter 6 is in a closed state, the second pin 72 enters the second photointerrupter 71, and the second photointerrupter 71 is in a closed state;

[0071] (2) The driving motor 54 drives the driving gear 53 to rotate, the track 52 drives the rotating gear 51 to rotate, the lead chamber push door pulling rod 3 rotates under the drive of the rotating gear 51, the lead chamber push door 1 moves away from the fixed plate 4, until the lead chamber push door 1 reaches the set position, at this time, the lead chamber push door 1 is in a fully closed state, the first pin 62 leaves the first photointerrupter 61, the first photointerrupter 6 is in a conductive state, the second pin 72 leaves the second photointerrupter 71, and the second photointerrupter 71 is in a conductive state;

[0072] (3) If the lead chamber push door 1 is closed, the first photointerrupter assembly 6 is turned on, and the "AND" gate logic circuit of the control relay is input with "1", the control assembly of the liquid scintillation analyzer receives the photodetector power-on instruction and detects that the second photointerrupter assembly 7 is turned on, and inputs "1" to the "AND" gate logic circuit, at this time, the output of the "AND" gate logic circuit is "1", the relay is turned on, and the photodetector is powered on.

[0073] (4) If the user accidentally issues a power-on command for the photodetector, if the lead chamber push door 1 is not closed and the second photoelectric switch assembly 7 is not turned on, the power-on command for the photodetector is not executed.

[0074] In some embodiments, as shown in FIG. 1, the lead chamber push door has been closed and the first photoelectric switch is in the on state; after the single-chip microcomputer receives a user power-on command, the switch state of the second photoelectric switch is detected, and if the second photoelectric switch is in the on state, an on command is issued to the AND gate logic circuit; the AND gate logic circuit simultaneously receives on commands from the first photoelectric switch and the second photoelectric switch, and sends a start command to the control relay to start the photodetector power-on test. Figure 3

[0075] The multiple-redundancy interlocking control system disclosed in the embodiments of the present application is applied to a liquid scintillation counter, and the first photoelectric switch assembly and the second photoelectric switch control assembly are independently controlled, independently operate, and do not interfere with each other, which can ensure that the photodetector of the liquid scintillation counter is not accidentally powered on and that the counting measurement chamber of the liquid scintillation counter can only be detected in the dark, thereby improving the safety of the liquid scintillation counter.

[0076] The technical solutions disclosed in the embodiments of the present application and the technical details disclosed in the embodiments are only exemplary to illustrate the inventive concept of the present application, and do not constitute a limitation on the technical solutions of the embodiments of the present application. Any conventional changes, substitutions or combinations of the technical details disclosed in the embodiments of the present application all have the same inventive concept as the present application and are within the protection scope of the claims of the present application.​

Claims

1. A multi-redundant safety interlock control system, applied to a liquid scintillation meter, characterized in that, The control system includes: The lead chamber push door is used to close the opening of the counting and measuring chamber of the liquid scintillation meter; A sliding track for the lead chamber door; the sliding track for the lead chamber door is U-shaped; the outer edge of the U-shaped structure is fixedly connected to the main body of the liquid scintillation meter, and the inner edge of the U-shaped structure has a shape adapted to the lead chamber door for slidable connection with the lead chamber door; A lead chamber push door traction rod is provided and connected to the lead chamber push door for pulling the lead chamber push door to move; A fixing plate is provided corresponding to the lead chamber push door. The fixing plate is provided with a through hole, and the lead chamber push door traction rod is provided through the through hole. A lead chamber door drive assembly is mounted on the fixed plate and connected to the lead chamber door traction rod for driving the lead chamber door traction rod. The first photoelectric switch assembly is adapted and installed with the lead chamber push door and the fixed plate to sense the opening and closing of the lead chamber push door; The second photoelectric switch assembly is adapted and installed with the lead chamber push door and the fixed plate to sense the opening and closing of the lead chamber push door; The first photoelectric switch assembly is connected to one input of an AND gate logic circuit, and the output of the AND gate logic circuit is connected to a relay, which controls the photodetector of the liquid scintillator. The second photoelectric switch assembly is connected to the control component of the liquid scintillator, and the control component of the liquid scintillator is connected to the other input of the AND gate logic circuit. The control logic for the first and second photoelectric switch assemblies is as follows: If the lead chamber door is closed, the first photoelectric switch assembly is turned on, inputting "1" to the AND gate logic circuit of the control relay; the control assembly of the liquid scintillator receives the power-on command of the photodetector and detects that the second photoelectric switch assembly is turned on, inputting "1" to the AND gate logic circuit. At this time, the output of the AND gate logic circuit is "1", the relay is turned on, and the photodetector is powered on. If the user accidentally issues a power-on command to the photodetector, and the lead chamber door is not closed at this time and the second photoelectric switch assembly is not conducting, the power-on command to the photodetector will not be executed.

2. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The outer edge of the lead chamber sliding door is provided with multiple fasteners for fixing to the liquid scintillation instrument structure.

3. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The lead chamber door drive assembly includes: Rotate the gear, which is installed at the end of the lead chamber push door traction rod; A drive gear is mounted on the fixed plate, and the rotating gear is connected to the drive gear via a track; A drive motor is connected to the drive gear and is used to drive the drive gear to rotate.

4. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The first photoelectric switch assembly and the second photoelectric switch assembly are arranged in parallel.

5. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The first photoelectric switch assembly includes: A first photoelectric switch is mounted on the fixed plate; The first latch is installed at the end of the lead chamber push door and corresponds to the first photoelectric switch.

6. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The second photoelectric switch assembly includes: A second photoelectric switch is mounted on the fixed plate; The second latch is installed at the end of the lead chamber push door and corresponds to the second photoelectric switch.

7. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The lead chamber push door traction rod is rotatably connected to the lead chamber push door by a thread.

8. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The liquid scintillator structure includes a lead shield.

9. The multi-redundancy safety interlocking control system according to claim 1, characterized in that, The sliding door track of the lead chamber is a one-piece molded structure made of metal.

10. A liquid scintillation meter, characterized in that, The liquid scintillation device is equipped with a multi-redundant safety interlock control system as described in any one of claims 1 to 9.

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