Multi-redundancy safety interlocking control system and liquid flash instrument

Abstract

The embodiment of the invention discloses a multi-redundancy safety interlocking control system and a liquid flash instrument. The system comprises a lead chamber push door and a lead chamber push door slideway, wherein a lead chamber push door traction rod is connected with the lead chamber push door and is used for pulling the lead chamber push door to move; the fixing plate and the lead chamber push door are correspondingly arranged; the lead chamber push door driving assembly is arranged on the fixing plate and used for driving the lead chamber push door traction rod. A first photoelectric switch assembly and a second photoelectric switch assembly; according to the control logic, if the lead chamber push door is closed, the first photoelectric switch assembly is switched on, and 1 is input into the AND gate logic circuit of the control relay; the control assembly receives a power-on instruction of the photoelectric detector, detects that the second photoelectric switch assembly is switched on and inputs' 1 'to the AND gate logic circuit, at the moment, the AND gate logic circuit outputs' 1 ', the relay is switched on, and the photoelectric detector is powered on; if a photoelectric detector electrifying instruction is accidentally given, the lead chamber push door is not closed, the second photoelectric switch assembly is not conducted, and the electrifying instruction is not executed.

Description

Technical Field

[0001] The invention belongs to the technical field of radiation detection, and in particular relates to a multiple redundant safety interlocking control system and a liquid scintillation instrument. Background Art

[0002] During nuclear and radiation emergency monitoring, it is necessary to collect samples, process and analyze radionuclides in suspected contaminated areas; some liquid transmission pipelines and storage facilities in nuclear facilities also need on-site inspections and radioactivity monitoring to monitor their operating status. The environmental samples collected for radiation in these places are usually of low activity and large in number, so a liquid scintillation spectrometer with good stability and low sample counting interference is required for measurement. Usually, a liquid scintillation spectrometer requires a stable and reliable lead chamber door control device to ensure that the counting chamber is strictly protected from light during operation to ensure the accuracy of scintillation counting.

[0003] The measurement process of liquid scintillation spectrometer is to dissolve the radioactive sample in the scintillation liquid, and the radioactive material dispersed or suspended in the scintillation liquid is in close contact with the scintillation liquid. The geometric condition is close to 4π, and there is almost no influence of sample self-absorption, scattering and geometric conditions. Therefore, the measurement accuracy and efficiency are greatly improved, and it is often used for the measurement of low-activity samples. When the liquid scintillation spectrometer is running, the automatic lead chamber push door switch is used to take and place samples. During the counting process, the lead chamber push door is in a closed state, providing a strictly light-proof operating environment for the counting system and shielding environmental rays. 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, leaving only the lead door that 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 that the counting chamber is strictly protected from light. Once the lead door is not closed when the device is running, ambient light will enter the counting chamber, causing the sample counting rate to be too high. In severe cases, the photomultiplier tube will be damaged, and then the liquid scintillation spectrometer will be damaged. The current liquid scintillation spectrometer has the risk of light leakage at the lead door, lacks protection for the counting system and guarantees for the safety of equipment operation. Summary of the invention

[0005] In view of this, on one hand, some embodiments disclose a multiple redundant safety interlocking control system applied to a liquid scintillation instrument, the control system comprising:

[0006] Lead chamber sliding door, used to close the counting and measuring chamber opening of the liquid scintillation instrument;

[0007] The lead chamber push door slideway is a U-shaped structure; the outer edge of the U-shaped structure is fixedly connected to the liquid scintillation instrument structure body, and the inner edge of the U-shaped structure has a shape adapted to the lead chamber push door and is used to be slidably connected to the lead chamber push door;

[0008] A lead chamber push door traction rod is arranged to be connected with the lead chamber push door and is used to pull the lead chamber push door to move;

[0009] A fixed plate is arranged corresponding to the lead chamber push door, a through hole is arranged on the fixed plate, and a traction rod of the lead chamber push door is arranged to pass through the through hole;

[0010] The lead chamber push door driving assembly is mounted on the fixed plate and connected to the lead chamber push door traction rod to drive the lead chamber push door traction rod;

[0011] The first photoelectric switch assembly is adapted and installed with the lead chamber sliding door and the fixing plate, and is used to sense the opening and closing of the lead chamber sliding door;

[0012] The second photoelectric switch assembly is adapted and installed with the lead chamber sliding door and the fixing plate, and is used to sense the opening and closing of the lead chamber sliding door;

[0013] The first photoelectric switch component is connected to one input of the AND gate logic circuit, and the output of the AND gate logic circuit is connected to a relay, which is used to control the photoelectric detector of the liquid scintillator; the second photoelectric switch component is connected to the control component of the liquid scintillator, and the control component of the liquid scintillator is connected to another input of the AND gate logic circuit; the control logic of the first photoelectric switch component and the second photoelectric switch component is:

[0014] If the lead chamber push door is closed, the first photoelectric switch component is turned on, and "1" is input to the "AND" gate logic circuit of the control relay; the control component of the liquid scintillation instrument receives the photoelectric detector power-on instruction, and detects that the second photoelectric switch component is turned on, and inputs "1" to the "AND" gate logic circuit. At this time, the "AND" gate logic circuit outputs "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 push door is not closed at this time and the second photoelectric switch component is not turned on, the photoelectric detector power-on command will not be executed.

[0016] Furthermore, in some embodiments of the disclosed multiple redundant interlocking control system, a plurality of fixing members are sequentially provided on the outer edge of the lead chamber door slideway for fixing to the liquid scintillation instrument structure body.

[0017] In some embodiments of the disclosed multiple redundant interlocking control system, the lead chamber door driving assembly includes:

[0018] Rotating gear, set to be installed at the end of the lead chamber push door traction rod;

[0019] A driving gear is mounted on a fixed plate, and the rotating gear is connected to the driving gear through a crawler track;

[0020] The driving motor is connected to the driving gear and is used to drive the driving gear to rotate.

[0021] In the multiple redundant interlocking control system disclosed in some embodiments, the first photoelectric switch component and the second photoelectric switch component are arranged in parallel.

[0022] In some embodiments of the disclosed multiple redundant interlocking control system, the first photoelectric switch assembly includes:

[0023] A first photoelectric switch is mounted on a 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] In some embodiments of the disclosed multiple redundant interlocking control system, the second photoelectric switch assembly includes:

[0026] A second photoelectric switch is mounted 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] In the multiple redundant interlocking control system disclosed in some embodiments, the lead chamber push door traction rod and the lead chamber push door are rotatably connected in a threaded manner.

[0029] In the multiple redundant interlocking control system disclosed in some embodiments, the liquid scintillator structure body includes a lead shielding body.

[0030] In some embodiments of the disclosed multiple redundant interlocking control system, the lead chamber door slideway is an integrally formed structure of metal material.

[0031] On the other hand, some embodiments disclose a liquid scintillator, in which the multiple redundant interlocking control system disclosed in the embodiments of the present invention is installed.

[0032] The multiple redundant interlocking control system disclosed in the embodiment of the present invention is applied to a liquid scintillator, and is provided with a first photoelectric switch component and a second photoelectric switch control component which are independently controlled, and which operate independently of each other without interfering with each other, thereby ensuring that the photoelectric detector of the liquid scintillator is not accidentally energized, and ensuring that the counting and measuring chamber of the liquid scintillator can only perform detection in a light-proof environment, thereby improving the safety of the liquid scintillator. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the composition of the multiple redundant safety interlocking control system disclosed in some embodiments Figure 1 ;

[0034] Figure 2 Schematic diagram of the composition of the multiple redundant safety interlocking control system disclosed in some embodiments Figure 2 ;

[0035] Figure 3 Flowchart of a lead chamber door push control method disclosed in some embodiments.

[0036] Reference numerals

[0037] 1 Lead chamber sliding door 2 Lead chamber sliding door slide

[0038] 3 Lead chamber door traction rod 4 Fixed plate

[0039] 5 Lead chamber 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 driving gear 54 driving motor

[0043] 61 first photoelectric switch 62 first latch

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

[0045] The word "embodiment" used herein as an "exemplary" does not necessarily mean that any embodiment described is superior or better than other embodiments. Performance index tests in the embodiments of the present invention are performed using conventional test methods in the art unless otherwise specified. It should be understood that the terms described in the embodiments of the present invention are only used to describe specific implementation methods and are not intended to limit the contents disclosed in the embodiments of the present invention.

[0046] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as commonly understood by ordinary technicians in the technical field to which the embodiments of the present invention belong; other experimental methods and technical means not specifically specified in the embodiments of the present invention refer to experimental methods and technical means commonly used by ordinary technicians in the field.

[0047] The terms "substantially" and "approximately" used herein are used to describe small fluctuations. For example, they can refer to 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%. The numerical data represented or presented in the range format herein are used only for convenience and brevity, and should therefore be flexibly interpreted as including not only the values ​​clearly listed as the limits of the range, but also all independent values ​​or sub-ranges contained in the range. For example, the numerical range of "1-5%" should be interpreted as including not only the clearly listed values ​​of 1% to 5%, but also the independent values ​​and sub-ranges within the range shown. Therefore, independent values ​​such as 2%, 3.5% and 4% and sub-ranges such as 1%-3%, 2%-4% and 3%-5% are included in this numerical range. This principle also applies to the range of only one numerical value. In addition, such an interpretation applies regardless of the width of the range or the characteristics described.

[0048] In this document, including in the claims, transitional words such as "comprises," "includes," "with," "having," "containing," "involving," "accommodating," etc. are understood to be open-ended, i.e., meaning "including but not limited to." Only the transitional words "consisting of" and "composed of" are closed transitional words.

[0049] In order to better illustrate the present invention, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In the embodiments, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.

[0050] Under the premise of no conflict, the technical features disclosed in the embodiments of the present invention may be arbitrarily combined, and the resulting technical solutions belong to the contents disclosed in the embodiments of the present invention.

[0051] In some embodiments, Figure 1 , Figure 2 The example shown is a multiple redundant safety interlocking control system for a liquid scintillation instrument, including:

[0052] Lead chamber push door 1, used to close the counting and measuring chamber opening of the liquid scintillation instrument;

[0053] The lead chamber push door slideway 2 is a U-shaped structure; the outer edge of the U-shaped structure is fixedly connected to the liquid scintillator structure body, and the inner edge of the U-shaped structure has a shape adapted to the lead chamber push door, and is used to be slidably connected to the lead chamber push door 1; the outer edge of the lead chamber push door slideway 2 is sequentially provided with a plurality of fixing members 21 for consolidation with the liquid scintillator structure body;

[0054] The lead chamber push door traction rod 3 is arranged to be connected with the lead chamber push door 1 and is used to pull the lead chamber push door 1 to move;

[0055] The fixing plate 4 is arranged corresponding to the lead chamber push door 1, and a through hole is arranged on the fixing plate 4, and the lead chamber push door traction rod is arranged to pass through the through hole;

[0056] The lead chamber push door driving assembly 5 is arranged and installed on the fixed plate 1 and connected with the lead chamber push door traction rod 3, and is used to drive the lead chamber push door traction rod 3; wherein the lead chamber push door driving assembly 5 includes: a rotating gear 51, which is arranged and installed at the end of the lead chamber push door traction rod 3; a driving gear 53 is arranged and installed on the fixed plate 4, and the rotating gear 51 and the driving gear 53 are arranged to be connected through a crawler 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] The first photoelectric switch assembly 6 is adapted to be installed with the lead chamber push door 1 and the fixed plate 4, and is used to sense the opening and closing of the lead chamber push door 1; wherein the first photoelectric switch assembly includes a first photoelectric switch 61, which is arranged and installed on the fixed plate 5; a first latch 62 is arranged and installed at the end of the lead chamber push door 1, corresponding to the first photoelectric switch 61;

[0058] The second photoelectric switch assembly 7 is adapted to be installed with the lead chamber push door 1 and the fixed plate 4, and is used to sense the opening and closing of the lead chamber push door 1; wherein the second photoelectric switch assembly comprises: a second photoelectric switch 71, which is arranged and installed on the fixed plate; a second latch 72 is arranged and installed at the end of the lead chamber push door 1, corresponding to the second photoelectric switch 71;

[0059] The first photoelectric switch component 6 is connected to one input of the AND gate logic circuit, and the output of the AND gate logic circuit is connected to a relay, which is used to control the photoelectric detector of the liquid scintillator; the second photoelectric switch component 7 is connected to the control component of the liquid scintillator, and the control component of the liquid scintillator is connected to another input of the AND gate logic circuit;

[0060] In some embodiments, the control component includes a single chip microcomputer;

[0061] In some embodiments, the liquid scintillator structure body includes a lead shield;

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

[0063] If the lead chamber push door 1 is closed, the first photoelectric switch assembly 6 is turned on, and "1" is input to the "AND" gate logic circuit of the control relay. The control assembly of the liquid scintillation instrument receives the photoelectric detector power-on instruction, and detects that the second photoelectric switch assembly 7 is turned on, and inputs "1" to the "AND" gate logic circuit. At this time, the "AND" gate logic circuit outputs "1", the relay is turned on, and the photoelectric detector is powered on;

[0064] If the user accidentally issues a photoelectric detector power-on command, if the lead chamber push door 1 is not closed at this time and the second photoelectric switch component 7 is not turned on, the photoelectric detector power-on command will not be executed.

[0065] In the multiple redundant interlocking control system disclosed in some embodiments, the first photoelectric switch component and the second photoelectric switch component are arranged in parallel.

[0066] In the multiple redundant interlocking control system disclosed in some embodiments, the lead chamber push door traction rod and the lead chamber push door are rotatably connected in a threaded manner.

[0067] In some embodiments of the disclosed multiple redundant interlocking control system, the lead chamber door slideway is an integrally formed structure of metal material.

[0068] Some embodiments disclose a liquid scintillator, in which the multiple redundant interlocking control system disclosed in the embodiments of the present invention is installed.

[0069] There are multiple redundant interlocking control systems in the liquid scintillation instrument. The control methods for the lead chamber door include:

[0070] (1) The driving motor 54 drives the driving gear 53 to rotate, and drives the rotating gear 51 to rotate through the crawler 52. The lead chamber door traction rod 3 rotates under the drive of the rotating gear 51, and moves the lead chamber door 1 toward the fixed plate 4 until the lead chamber door 1 reaches the set position. At this time, the lead chamber door 1 is in a fully open state, the first latch 62 enters the first photoelectric switch 61, and the first photoelectric switch 6 is in a closed state, and the second latch 72 enters the second photoelectric switch 71, and the second photoelectric switch 71 is in a closed state;

[0071] (2) The driving motor 54 drives the driving gear 53 to rotate, and drives the rotating gear 51 to rotate through the crawler 52. The lead chamber door traction rod 3 rotates under the drive of the rotating gear 51, and moves the lead chamber door 1 away from the fixed plate 4 until the lead chamber door 1 reaches the set position. The lead chamber door 1 is in a fully closed state. At this time, the first latch 62 leaves the first photoelectric switch 61, and the first photoelectric switch 6 is in a conducting state. The second latch 72 leaves the second photoelectric switch 71, and the second photoelectric switch 71 is in a conducting state.

[0072] (3) If the lead chamber push door 1 is closed, the first photoelectric switch assembly 6 is turned on, and a "1" is input to the "AND" gate logic circuit of the control relay. The control assembly of the liquid scintillation instrument receives the photoelectric detector power-on instruction and detects that the second photoelectric switch assembly 7 is turned on, and a "1" is input to the "AND" gate logic circuit. At this time, the "AND" gate logic circuit outputs "1", the relay is turned on, and the photoelectric detector is powered on.

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

[0074] In some embodiments, Figure 3 As shown, the lead chamber push door is closed and the first photoelectric switch is in the on state; after the single-chip microcomputer receives the user's power-on command, it detects the switch state of the second photoelectric switch. If the second photoelectric switch is in the on state, it sends an on command to the "AND" gate logic circuit; the "AND" gate logic circuit simultaneously receives the on command that both the first photoelectric switch and the second photoelectric switch are in the on state, and sends a start command to the control relay to start the power-on test of the photoelectric detector.

[0075] The multiple redundant interlocking control system disclosed in the embodiment of the present invention is applied to a liquid scintillator, and is provided with a first photoelectric switch component and a second photoelectric switch control component which are independently controlled, and which operate independently of each other without interfering with each other, thereby ensuring that the photoelectric detector of the liquid scintillator is not accidentally energized, and ensuring that the counting and measuring chamber of the liquid scintillator can only perform detection in a light-proof environment, thereby improving the safety of the liquid scintillator.

[0076] The technical solutions disclosed in the embodiments of the present invention and the technical details disclosed in the embodiments are merely illustrative of the inventive concept of the present invention and do not constitute a limitation on the technical solutions of the embodiments of the present invention. Any conventional changes, replacements or combinations of the technical details disclosed in the embodiments of the present invention have the same inventive concept as the present invention and are within the protection scope of the claims of the present invention.

Claims

1. Multiple redundant safety interlocking control system, applied to liquid scintillation instrument, characterized by: The control system comprises: Lead chamber sliding door, used to close the counting and measuring chamber opening of the liquid scintillation instrument; The lead chamber push door slideway is a U-shaped structure; the outer edge of the U-shaped structure is fixedly connected to the liquid scintillation instrument structure body, and the inner edge of the U-shaped structure has a shape adapted to the lead chamber push door and is used to be slidably connected to the lead chamber push door; A lead chamber push door traction rod is arranged to be connected to the lead chamber push door and is used to pull the lead chamber push door to move; A fixed plate is arranged corresponding to the lead chamber push door, the fixed plate is provided with a through hole, and the lead chamber push door traction rod is arranged to pass through the through hole; A lead chamber push door driving assembly is mounted on the fixed plate and connected to the lead chamber push door traction rod to drive the lead chamber push door traction rod; A first photoelectric switch assembly is adapted and installed with the lead chamber sliding door and the fixing plate, and is used to sense the opening and closing of the lead chamber sliding door; A second photoelectric switch assembly is mounted on the lead chamber sliding door and the fixing plate to sense the opening and closing of the lead chamber sliding door; The first photoelectric switch component 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 is used to control the photoelectric detector of the liquid scintillator; the second photoelectric switch component is connected to the control component of the liquid scintillator, and the control component of the liquid scintillator is connected to another input of the AND gate logic circuit; the control logic of the first photoelectric switch component and the second photoelectric switch component is: If the lead chamber push door is closed, the first photoelectric switch component is turned on, and "1" is input to the "AND" gate logic circuit of the control relay; the control component of the liquid scintillation instrument receives the photoelectric detector power-on instruction, and detects that the second photoelectric switch component is turned on, and inputs "1" to the "AND" gate logic circuit. At this time, the "AND" gate logic circuit outputs "1", the relay is turned on, and the photoelectric detector is powered on; If the user accidentally issues a photoelectric detector power-on command, if the lead chamber push door is not closed at this time and the second photoelectric switch component is not turned on, the photoelectric detector power-on command will not be executed.

2. The multiple redundant interlocking control system according to claim 1, characterized in that: The outer edge of the lead chamber door sliding channel is sequentially provided with a plurality of fixing parts for fixing with the liquid scintillation instrument structure body.

3. The multiple redundant interlocking control system according to claim 1, characterized in that: The lead chamber push door driving assembly comprises: A rotating gear is arranged and mounted on the end of the lead chamber door push rod; A driving gear is mounted on the fixed plate, and the rotating gear is connected to the driving gear through a crawler; A driving motor is arranged to be connected with the driving gear and is used for driving the driving gear to rotate.

4. The multiple redundant interlocking control system according to claim 1, characterized in that: The first photoelectric switch component and the second photoelectric switch component are arranged in parallel.

5. The multiple redundant interlocking control system according to claim 1, characterized in that: The first photoelectric switch assembly comprises: A first photoelectric switch is mounted on the fixing plate; The first latch is arranged and installed at the end of the lead chamber sliding door and corresponds to the first photoelectric switch.

6. The multiple redundant interlocking control system according to claim 1, characterized in that: The second photoelectric switch assembly comprises: A second photoelectric switch is mounted on the fixing plate; The second latch is arranged and installed at the end of the lead chamber push door, corresponding to the second photoelectric switch.

7. The multiple redundant 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 in a threaded manner.

8. The multiple redundant interlocking control system according to claim 1, characterized in that: The liquid scintillator structure body comprises a lead shielding body.

9. The multiple redundant interlocking control system according to claim 1, characterized in that: The lead chamber door sliding track is an integrally formed structure of metal material.

10. A liquid scintillation instrument, characterized in that: The liquid scintillator is provided with a multiple redundant interlocking control system as claimed in any one of claims 1 to 9.

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