CN113267804A - Light-shielding detection method for liquid scintillation counter - Google Patents
Light-shielding detection method for liquid scintillation counter Download PDFInfo
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- CN113267804A CN113267804A CN202110578236.3A CN202110578236A CN113267804A CN 113267804 A CN113267804 A CN 113267804A CN 202110578236 A CN202110578236 A CN 202110578236A CN 113267804 A CN113267804 A CN 113267804A
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- light
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- sample bottle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/2002—Optical details, e.g. reflecting or diffusing layers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/08—Means for conveying samples received
Abstract
The invention discloses a light-shielding detection method for a liquid scintillation counter, which comprises the following steps: firstly, installing a light-shading interlocking device; secondly, lofting and sample introduction of the sample bottle; thirdly, locking the light-proof cover in a light-proof way; fourthly, detecting a sample; fifthly, releasing the light-proof locking of the light-proof cover and the sample withdrawal of the sample bottle; and sixthly, discharging the sample from the sample bottle. According to the invention, the light-proof cover and the rotation limiting block are linked, so that the light-proof cover and the pressure rod assembly are mutually restricted and linked, manual lofting and instant measurement are realized, the requirement of field environment rapid measurement is met, the light-proof state of the measurement cavity during measurement and during the sample changing process is ensured, the pressure rod assembly is locked and cannot be pulled when the light-proof cover is opened, the light-proof cover is locked and cannot be opened during the measurement process, the pure physical mechanical structure prevents misoperation of personnel during the detection process, the reliability is strong, the anti-seismic effect is good, the detection accuracy is ensured, and the popularization and the use are convenient.
Description
Technical Field
The invention belongs to the technical field of liquid scintillation measurement, and particularly relates to a light-shielding detection method for a liquid scintillation counter.
Background
The liquid scintillation counter mainly comprises a measuring system, a light-shading system and a data processing system, and due to the characteristics of the instrument, visible light, cosmic rays and chemiluminescence can cause measurement result errors and even damage to instrument components. Most of the previous instruments are used in hospitals and laboratories, the sample size is large, automatic sample transportation and automatic measurement are needed, a light-shading system is generally electrically driven, and the instrument size is large. However, when the radioactivity measurement is carried out in a field environment, the used equipment is portable, the sample amount is small, the requirement for real-time measurement is met, the required instrument is small in size, stable in working and good in anti-seismic performance, and manual lofting rapid measurement can be achieved.
Due to the characteristics of the using environment and instruments, the existing measuring instruments on the market cannot be directly used. Therefore, a liquid scintillation counting device capable of measuring manual lofting in real time is needed at present to ensure the light-shielding state of the measurement chamber during measurement and during the lofting process, and realize the light-shielding detection of the portable liquid scintillation counter.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a light-shielding detection method for a liquid scintillation counter, aiming at the defects in the prior art, the light-shielding cover and the rotation limiting block are linked, so that the light-shielding cover and the pressure rod assembly are mutually restricted and linked, manual lofting and instant measurement are realized, the requirement of rapid measurement in the field environment is met, the light-shielding state of a measurement cavity is ensured during measurement and during sample changing, the pressure rod assembly is locked and can not be pulled when the light-shielding cover is opened, the light-shielding cover is locked and can not be opened during measurement, misoperation of personnel during detection is prevented, the detection accuracy is ensured, and the method is convenient to popularize and use.
In order to solve the technical problems, the invention adopts the technical scheme that: a light-shielding detection method for a liquid scintillation counter comprises a detection lead chamber, a light guide and two photomultiplier tubes, wherein the light guide is arranged in the detection lead chamber, the two photomultiplier tubes are arranged on two sides of the light guide, a measurement chamber with an open top is arranged in the detection lead chamber, and the measurement chamber penetrates through the light guide, and the light-shielding detection method is characterized by comprising the following steps:
step one, installing a light-shading interlocking device:
installing a light-proof interlocking device, wherein a light-proof cover in the light-proof interlocking device is in an opening and closing state; the light-resistant interlocking device comprises a shell arranged outside the detection lead chamber, a light-resistant cover arranged at the top of the shell and used for sealing the measurement cavity, a sample moving mechanism arranged on the shell and used for controlling a sample bottle to move in the measurement cavity, and a limiting mechanism connected between the light-resistant cover and the sample moving mechanism and used for limiting the movement of the light-resistant cover and the sample moving mechanism, wherein a clamping piece inserted into the shell is arranged at the bottom of the light-resistant cover, and a through hole matched with the light-resistant cover and a groove for the clamping piece to pass through are formed in the shell;
the sample moving mechanism comprises a lifting jacking mechanism which extends into the measuring chamber and is used for supporting a sample bottle, a lifting stop block which is used for driving the lifting jacking mechanism to lift, a pressure rod assembly which is used for pressing the lifting stop block downwards, a locking device which is used for locking the pressure rod assembly, and a reset guide mechanism which is used for resetting the lifting stop block upwards;
the limiting mechanism comprises a rotating limiting block for limiting the lifting stop block to descend, the horizontal rotating direction of the rotating limiting block is limited by the side wall of the lifting stop block, and the rotating limiting block is in transmission connection with the light-shading cover through a gear transmission mechanism; the rotation limiting block is in a state of limiting the lifting stop block to descend;
step two, lofting and sample introduction of a sample bottle:
step 201, lifting up and opening the light-shading cover, enabling the clamping piece to pass through the groove and be lifted out of the shell, placing a sample bottle into the measurement cavity, enabling the sample bottle to be located on the lifting jacking mechanism, and completing lofting of the sample bottle;
step 202, closing the light-shading cover, and enabling the clamping piece to penetrate through the groove to extend into the shell and to be matched with the gear transmission mechanism;
step 203, horizontally rotating the light-resistant cover, driving the rotation limiting block to rotate through the gear rotating mechanism until the rotation limiting block rotates away from a descending path of the lifting stop block, and removing the limitation on the lifting of the lifting stop block, wherein at the moment, the clamping piece is staggered with the groove, and the light-resistant cover cannot be opened;
step 204, controlling the pressure lever assembly to press down the lifting stop block until the lifting jacking mechanism driven by the lifting stop block moves the sample bottle downwards to a light guide internal detection position, and completing sample injection of the sample bottle;
step three, light-proof locking of a light-proof cover:
the current position of the pressure lever assembly is locked by the locking device immediately after the sample bottle is injected, so that the current position of the sample bottle is locked; at the moment, the side wall of the lifting stop block limits the horizontal rotation of the rotation limiting block, so that the rotation of the light-avoiding cover is limited, and the light-avoiding cover is kept in a light-avoiding state which cannot be opened;
step four, sample detection:
the photomultiplier receives an optical signal generated by a radioactive sample in the sample bottle under the excitation of scintillation liquid, converts the optical signal into an electrical signal and transmits the electrical signal to subsequent processing equipment for processing;
step five, releasing the light-proof locking of the light-proof cover and withdrawing the sample bottle:
step 501, after the sample is detected, unlocking the locking device to lock the pressure lever assembly;
step 502, moving the pressure lever assembly upwards, wherein the lifting stop block rises under the action of the reset guide mechanism, so as to drive the sample bottle on the lifting jacking mechanism to move back to the position after the sample bottle is lofted in the step 201, so as to finish the lofting of the sample bottle, and at the moment, the lifting stop block relieves the limitation on the horizontal rotation of the rotation limiting block, so that the rotation limitation on the light-shading cover is relieved, namely the light-shading locking of the light-shading cover is relieved;
step six, sample discharging of the sample bottle:
and reversely rotating the light-proof cover to enable the clamping piece to be positioned under the groove, lifting up the light-proof cover to open the light-proof cover, taking out the sample bottle, and finishing the sample outlet of the sample bottle.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: in the first step, the shell is provided with a top panel for mounting the light-shielding cover and an inclined side panel for mounting the pressure bar assembly, the top of the inclined side panel is connected with the top panel, the inclined side panel is inclined towards the direction far away from the detection lead chamber, the through hole and the groove are formed in the top panel, and the groove is communicated with the through hole.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: the depression bar subassembly is including installing the installation panel on oblique side board, setting up at the inboard guide rail of installation panel and stretching into to the installation panel in and along the gliding horizontal depression bar from top to bottom of guide rail, the axis and the oblique side board of guide rail are parallel, and the one end that horizontal depression bar is close to the installation panel is fixed and is provided with the handle, and outside the handle passed the installation panel and stretches out to oblique side board, the central line perpendicular to installation panel of handle offered the direction rectangular hole that supplies the handle to slide on the installation panel.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: locking device establishes locking spring and installation sleeve pipe on the handle including the cover, and the installation sleeve pipe stretches into in the installation panel and compresses tightly locking spring on the horizontal depression bar of handle bottom, and the installation sleeve pipe stretches into the pot head in the installation panel and is equipped with the butt at the inboard first snap ring of installation panel and sets up the second snap ring of keeping away from installation panel one side at first snap ring, and the external diameter of first snap ring is greater than the width in direction rectangular hole, and the external diameter of second snap ring is greater than the external diameter of first snap ring, set up the locking hole with direction rectangular hole intercommunication on the installation panel, the locking hole is seted up in the bottom in direction rectangular hole, and the aperture in locking hole is greater than the external diameter of first snap ring and is less than the external diameter of second snap ring.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: the lifting stop block comprises a rail sliding plate for horizontal movement of a horizontal compression rod, a limiting vertical plate arranged on the rail sliding plate and used for limiting the rotation of the limiting block to horizontally rotate, and a guide post mounting seat arranged at two ends of the limiting vertical plate and used for mounting the reset guide mechanism.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: the gear transmission mechanism comprises a rotating shaft used for installing a rotating limiting block, a gear ring which is arranged at the top of the detection lead chamber and is driven by the shading cover to rotate, and a sector which is fixed on the rotating shaft and is in transmission connection with the gear ring.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: a gland fixed on the gear ring is arranged between the gear ring and the light-shading cover, a clamping groove matched with the clamping piece is formed in the gland, and the clamping piece is inserted into the clamping groove and drives the gear ring to rotate.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: the reset guide mechanism comprises a guide post penetrating through the guide post mounting seat and a first reset spring which is sleeved on the guide post at the lower part of the guide post mounting seat and used for resetting upwards the lifting stop block.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: the lifting jacking mechanism comprises a mandril stretching into the measuring chamber, a bearing seat arranged at the top of the mandril and used for bearing a sample bottle, and a connecting rod used for connecting the mandril with the lifting stop block, wherein a sealing ring is arranged at the top of the bearing seat, and a second reset spring is sleeved on the mandril.
The light-shielding detection method of the liquid scintillation counter is characterized by comprising the following steps: the top of the rotating shaft is fixed on the installation top plate, the bottom of the rotating shaft is fixed on the installation bottom plate, and the installation top plate is provided with a limiting column used for limiting the rotating angle of the sector.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the light-proof cover and the rotation limiting block are linked, so that the light-proof cover and the pressure rod assembly are mutually restricted and linked, manual lofting and instant measurement are realized, the requirement of field environment rapid measurement is met, the light-proof state of the measurement cavity during measurement and during the sample changing process is ensured, the pressure rod assembly is locked and cannot be pulled when the light-proof cover is opened, the light-proof cover is locked and cannot be opened during the measurement process, misoperation of personnel during the detection process is prevented, and the detection accuracy is ensured.
2. The light-shading interlocking device adopted by the invention belongs to a pure physical mechanical device for realizing lofting and light shading of samples, has a compact mechanical structure, strong reliability and good anti-seismic effect, and improves the reliability and environmental adaptability of products through pure physical mechanical transmission.
3. The method adopted by the invention enables an operator to perform detection operation only according to the specified operation steps, and if the operation deviates from the process and jumps, the operation cannot be performed due to the limitation of the limiting mechanism, so that misoperation is directly avoided, and the detection accuracy is ensured.
In conclusion, the light-proof cover and the rotation limiting block are linked, so that the light-proof cover and the pressure rod assembly are mutually restricted and linked, manual lofting and real-time measurement are realized, the requirement of field environment rapid measurement is met, the light-proof state of the measurement cavity in the measurement process and the sample changing process is ensured, the pressure rod assembly is locked and cannot be pulled when the light-proof cover is opened, the light-proof cover is locked and cannot be opened in the measurement process, the pure physical mechanical structure prevents misoperation of personnel in the detection process, the reliability is high, the anti-seismic effect is good, the detection accuracy is ensured, and the popularization and the use are convenient.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural view of the light-shielding interlocking device of the present invention.
Fig. 2 is a schematic structural view of fig. 1 with the top panel and the inclined side panels removed.
Fig. 3 is a left side view of the light-shielding interlocking device of the present invention.
FIG. 4 is a schematic view of the installation relationship of the strut assembly and the locking device of the present invention.
Fig. 5 is an enlarged view of fig. 2 at a.
Fig. 6 is an enlarged view of fig. 2 at B.
Fig. 7 is an enlarged view of fig. 3 at C.
FIG. 8 is a block flow diagram of the method of the present invention.
Description of reference numerals:
1-detecting lead chamber; 2-a light guide; 3-a measurement chamber;
4-light-proof cover; 5-sample bottle; 6-clamping piece;
7-rotating the limiting block; 8-a top panel; 9-oblique side panels;
10-mounting a panel; 11-a guide rail; 12-a horizontal compression bar;
13-a handle; 14-guiding the elongated hole; 15-a display screen;
16-deep groove ball bearings; 17-a locking spring; 18-installing the bushing;
19-a first snap ring; 20-a second snap ring; 21-a locking hole;
22-handle cap; 23-a track slide; 24-a limiting vertical plate;
25-a guide post mount; 26-a limiting column; 27-a groove;
28-rotating shaft; 29-gear ring; 30-toothed sector;
31-ball plunger; 32-a gland; 33-card slot;
34-a guide post; 35-a first return spring; 36-a top rod;
37-a holder block; 38-connecting rod; 39-a sealing ring;
40-a second return spring; 41-installing a top plate; 42-mounting the bottom plate.
Detailed Description
As shown in fig. 1 to 8, a light-shielding detection method for a liquid scintillation counter of the present invention includes a detection lead chamber 1, a light guide 2 disposed in the detection lead chamber 1, and two photomultiplier tubes disposed on two sides of the light guide 2, where the detection lead chamber 1 has a measurement chamber 3 with an open top, and the measurement chamber 3 penetrates through the light guide 2, and the method includes the following steps:
step one, installing a light-shading interlocking device:
installing a light-proof interlocking device, wherein a light-proof cover 4 in the light-proof interlocking device is in an opening and closing state; the light-resistant interlocking device comprises a shell arranged outside the detection lead chamber 1, a light-resistant cover 4 arranged at the top of the shell and used for sealing the measurement cavity 3, a sample moving mechanism arranged on the shell and used for controlling the movement of a sample bottle 5 in the measurement cavity 3, and a limiting mechanism connected between the light-resistant cover 4 and the sample moving mechanism and used for limiting the movement of the light-resistant cover 4 and the sample moving mechanism, wherein a clamping piece 6 inserted into the shell is arranged at the bottom of the light-resistant cover 4, and a through hole matched with the light-resistant cover 4 and a groove 27 for the clamping piece 6 to pass through are formed in the shell;
the sample moving mechanism comprises a lifting jacking mechanism which extends into the measuring chamber 3 and is used for supporting the sample bottle 5, a lifting stop block which is used for driving the lifting jacking mechanism to lift, a pressure rod assembly which is used for pressing down the lifting stop block, a locking device which is used for locking the pressure rod assembly, and a reset guide mechanism which is used for resetting the lifting stop block upwards;
the limiting mechanism comprises a rotating limiting block 7 for limiting the lifting stop block to descend, the horizontal rotating direction of the rotating limiting block 7 is limited by the side wall of the lifting stop block, and the rotating limiting block 7 is in transmission connection with the light-shading cover 4 through a gear transmission mechanism; the rotation limiting block 7 is in a state of limiting the descending of the lifting stop block;
step two, lofting and sample introduction of a sample bottle:
step 201, lifting up and opening the light-shading cover 4, enabling the clamping piece 6 to pass through the groove 27 and be lifted out of the shell, placing the sample bottle 5 into the measurement chamber 3, enabling the sample bottle 5 to be located on the lifting jacking mechanism, and completing lofting of the sample bottle 5;
step 202, closing the light-shading cover 4, and enabling the clamping piece 6 to penetrate through the groove 27 to extend into the shell and to be matched with the gear transmission mechanism;
step 203, horizontally rotating the light-resistant cover 4, driving the rotation limiting block 7 to rotate through the gear rotating mechanism until the rotation limiting block 7 rotates away from the descending path of the lifting stop block, and removing the limitation on the lifting of the lifting stop block, wherein at the moment, the clamping piece 6 is dislocated with the groove 27, and the light-resistant cover 4 cannot be opened;
step 204, controlling the pressure lever assembly to press down the lifting stop block until the lifting jacking mechanism driven by the lifting stop block moves the sample bottle 5 downwards to the detection position in the light guide 2, and completing sample introduction of the sample bottle 5;
step three, light-proof locking of a light-proof cover:
the current position of the pressure lever assembly is locked by the locking device immediately after the sample bottle 5 is injected, so that the current position of the sample bottle 5 is locked; at the moment, the side wall of the lifting stop block limits the horizontal rotation of the rotation limiting block 7, so that the rotation of the light-avoiding cover 4 is limited, and the light-avoiding cover 4 is kept in a light-avoiding state which cannot be opened;
step four, sample detection:
the photomultiplier receives an optical signal generated by the radioactive sample in the sample bottle 5 under the excitation of the scintillation liquid, converts the optical signal into an electrical signal and transmits the electrical signal to subsequent processing equipment for processing;
step five, releasing the light-proof locking of the light-proof cover and withdrawing the sample bottle:
step 501, after the sample is detected, unlocking the locking device to lock the pressure lever assembly;
step 502, moving the pressure lever assembly upwards, wherein the lifting stop block rises under the action of the reset guide mechanism, so as to drive the sample bottle 5 on the lifting jacking mechanism to move back to the position where the sample bottle 5 is lofted in the step 201, so as to finish the lofting of the sample bottle 5, and at the moment, the lifting stop block relieves the limitation on the horizontal rotation of the rotation limiting block 7, so that the rotation limitation on the light-shading cover 4 is relieved, namely the light-shading locking of the light-shading cover is relieved;
step six, sample discharging of the sample bottle:
reversely rotating the light-proof cover 4 to enable the clamping piece 6 to be positioned under the groove 27, lifting up to open the light-proof cover 4, taking out the sample bottle 5, and finishing the sample output of the sample bottle; during the period, the light-shielding cover 4 drives the rotating limiting block 7 to rotate reversely through the gear rotating mechanism when rotating reversely, and the rotating limiting block 7 is restored to limit the descending state of the lifting stop block after the sample bottle is discharged;
and finishing the lightproof detection of the sample in the liquid scintillation counter.
In this embodiment, follow-up processing equipment includes signal processing circuit board and controller, and the controller processing data passes through display screen 15 after detecting and shows with data, and suggestion operating personnel removes the light-resistant locking of light-resistant lid afterwards, carries out the light-resistant of sample bottle and detects that moves back the appearance and go out the appearance, accomplishes the light-resistant of a sample and detects.
In this embodiment, the clip 6 is a pin inserted into the side wall of the light-shielding cover 4.
It should be noted that the reset guide mechanism serves as a support mechanism of the lifting stop block to support the lifting stop block when the press rod assembly does not press down the lifting stop block, so that the press rod assembly overlapped on the lifting stop block cannot press down the lifting stop block under the condition of non-manual operation.
What need explain is, through covering 4 with keeping away light and rotating stopper 7 linkage, make the keeping away light cover 4 with the depression bar subassembly restricts chain each other, realizes manual laying-out and instantaneous measurement, satisfies field environment rapid survey's requirement, when having guaranteed to measure with the light-proof state of changing a design in-process measurement chamber 3 for the depression bar subassembly lock is died and can not stimulate when the light-proof cover is opened, and is covered the lock and can not be opened at the measurement in-process, prevents personnel's maloperation in the testing process, guarantees the accuracy of detecting.
The light-resistant interlocking device adopted by the method belongs to a pure physical mechanical device for realizing lofting and light resistance of a sample, has a compact mechanical structure, strong reliability and good anti-seismic effect, and improves the reliability and environmental adaptability of a product through pure physical mechanical transmission.
The method adopted by the invention enables an operator to perform detection operation only according to the specified operation steps, and if the operation deviates from the process and jumps, the operation cannot be performed due to the limitation of the limiting mechanism, so that misoperation is directly avoided, and the detection accuracy is ensured.
In this embodiment, in the first step, the housing has a top panel 8 for mounting the light-shielding cover 4 and an inclined side panel 9 for mounting the pressure bar assembly, the top of the inclined side panel 9 is connected to the top panel 8, the inclined side panel 9 is inclined in a direction away from the lead detection chamber 1, the through hole and the groove 27 are both formed in the top panel 8, and the groove 27 is communicated with the through hole.
In this embodiment, the pressing rod assembly includes an installation panel 10 installed on the inclined side panel 9, a guide rail 11 arranged on the inner side of the installation panel 10, and a horizontal pressing rod 12 extending into the installation panel 10 and sliding up and down along the guide rail 11, a central axis of the guide rail 11 is parallel to the inclined side panel 9, a handle 13 is fixedly arranged at one end of the horizontal pressing rod 12 close to the installation panel 10, the handle 13 penetrates through the installation panel 10 and extends out of the inclined side panel 9, a central line of the handle 13 is perpendicular to the installation panel 10, and a guide long hole 14 for the handle 13 to slide is formed in the installation panel 10.
In this embodiment, the inclined side panel 9 is further provided with a display screen 15.
In this embodiment, a deep groove ball bearing 16 is disposed at one end of the horizontal pressing rod 12 overlapping the lift stop block for facilitating the movement of the horizontal pressing rod 12, so as to reduce the friction between the horizontal pressing rod 12 and the lift stop block, thereby facilitating the sliding of the horizontal pressing rod 12.
It should be noted that, in the practical use process, fastener 6 of light-resistant cover 4 passes through recess 27 and stretches into in the casing, and light-resistant cover 4 rotates the back, and fastener 6 and 8 inner walls of top panel joint, the effect of through-hole and recess 27 only lie in letting light-resistant cover 4 and fastener 6 pass through.
It should be noted that the maximum vertical distance of the handle 13 descending in the guide elongated hole 14 is the distance of the sample moving mechanism to bring the sample bottle 5 into the center of the light guide 2 for detection.
It should be noted that the horizontal pressing rod 12 is driven by the handle 13 to move downwards along the guiding strip hole 14, and meanwhile, the deep groove ball bearing 16 moves away from the detection lead chamber 1 to press the lifting stop block downwards.
In this embodiment, the locking device includes locking spring 17 and installation sleeve 18 that the cover was established on handle 13, installation sleeve 18 stretches into in installing panel 10 and compresses tightly locking spring 17 on the horizontal depression bar 12 of handle 13 bottom, and the pot head that installation sleeve 18 stretches into in installing panel 10 is equipped with the first snap ring 19 of butt in installing panel 10 inboard and sets up the second snap ring 20 that keeps away from installing panel 10 one side at first snap ring 19, and the external diameter of first snap ring 19 is greater than the width of direction rectangular hole 14, and the external diameter of second snap ring 20 is greater than the external diameter of first snap ring 19, set up the locking hole 21 with direction rectangular hole 14 intercommunication on installing panel 10, locking hole 21 sets up in the bottom of direction rectangular hole 14, and the aperture of locking hole 21 is greater than the external diameter of first snap ring 19 and is less than the external diameter of second snap ring 20.
In this embodiment, a handle cap 22 is sleeved outside the mounting sleeve 18.
It should be noted that, the horizontal pressure lever 12 moves downward along the guiding elongated hole 14 under the driving of the handle 13 to press the lifting stop, when the handle 13 moves to the position of the locking hole 21 at the lower end of the guiding elongated hole 14, the handle 13 is released, the locking spring 17 pushes the mounting sleeve 18 towards the outer side of the housing, so that the first snap ring 19 extends out of the locking hole 21, the second snap ring 20 abuts against the inner side of the mounting panel 10, at this time, the handle 13 cannot move up and down normally, and only after the handle 13 is pressed into the housing, the first snap ring 19 retracts into the locking hole 21, the handle 13 can be controlled to move upward along the guiding elongated hole 14 normally; in the meantime, after the handle 13 is locked in the locking hole 21, the light-shielding cover 4 cannot be rotated and therefore cannot be opened, so that the light-shielding cover 4 is locked, and the accuracy of detection is ensured.
In this embodiment, the lifting stop block comprises a rail sliding plate 23 for the horizontal movement of the horizontal compression rod 12, a limiting vertical plate 24 arranged on the rail sliding plate 23 and used for limiting the horizontal rotation of the rotation limiting block 7, and a guide post mounting seat 25 arranged at two ends of the limiting vertical plate 24 and used for mounting the reset guide mechanism.
It should be explained that, including the lofting to sample bottle 5, advance a kind, return a kind and four processes of sample in the sample measurement process, wherein, lofting and sample need open light-resistant lid 4, the process of advancing a kind and returning a kind needs light-resistant lid 4 whole to seal, the spacing riser 24 restriction of in-process of advancing a kind and returning a kind rotates stopper 7, light-resistant lid 4 is connected with rotation stopper 7 transmission, consequently light-resistant lid 4 also can't rotate, light-resistant lid 4 can't lift out under the restriction of fastener 6 the casing prevents personnel maloperation in the testing process, makes operating personnel can only operate according to the operating procedure of regulation, if skew flow jump step operation then can be because stop gear's restriction can't carry out, directly avoids the maloperation, guarantees the accuracy of detection.
In this embodiment, the gear transmission mechanism includes a rotating shaft 28 for installing the rotation limiting block 7, a gear ring 29 which is arranged at the top of the detection lead chamber 1 and is driven to rotate by the light-shielding cover 4, and a sector 30 which is fixed on the rotating shaft 28 and is in transmission connection with the gear ring 29.
In this embodiment, a ball plunger 31 for facilitating the rotation of the gear ring 29 is disposed at the bottom of the gear ring 29.
It should be noted that the gear transmission mechanism realizes the transmission connection between the light-shielding cover 4 and the rotation limiting block 7, and when the rotation limiting block 7 is limited and cannot rotate, the light-shielding cover 4 cannot rotate.
In this embodiment, a pressing cover 32 fixed on the gear ring 29 is arranged between the gear ring 29 and the light-shielding cover 4, a clamping groove 33 matched with the clamping piece 6 is formed in the pressing cover 32, and the clamping piece 6 is inserted into the clamping groove 33 and drives the gear ring 29 to rotate.
In this embodiment, the reset guide mechanism includes a guide post 34 penetrating through the guide post mounting seat 25 and a first reset spring 35 sleeved on the guide post 34 at the lower part of the guide post mounting seat 25 and used for resetting the lifting stop block upwards.
In this embodiment, the quantity of guide post 34 is two, and two guide posts 34 are worn to establish respectively on the guide post mount pad 25 at spacing riser 24 both ends, guarantee stability when lift dog goes up and down.
In this embodiment, the lifting jacking mechanism comprises a top rod 36 extending into the measurement chamber 3, a supporting seat 37 arranged at the top of the top rod 36 and used for supporting the sample bottle 5, and a connecting rod 38 used for connecting the top rod 36 with the lifting stop block, wherein a sealing ring 39 is arranged at the top of the supporting seat 37, and a second return spring 40 is sleeved on the top rod 36.
In this embodiment, the connecting rod 38 is an L-shaped connecting rod, and a waist-shaped hole for connecting with the guide post mounting seat 25 is formed in the connecting rod 38, so that the mounting height of the connecting rod 38 can be conveniently adjusted according to actual conditions.
It should be noted that the outer side wall of the sealing ring 39 is attached to the inner wall of the measurement chamber 3, so that the lifting jacking mechanism is ensured to accommodate part of the measurement chamber 3 containing the sample bottle 5 to avoid light during lifting.
It should be noted that the second return spring 40 and the first return spring 35 work together to ensure the stability of the sample bottle when the sample bottle is removed.
In this embodiment, the top of the rotating shaft 28 is fixed on the top mounting plate 41, the bottom of the rotating shaft 28 is fixed on the bottom mounting plate 42, and the top mounting plate 41 is provided with the limiting post 26 for limiting the rotation angle of the sector 30.
In this embodiment, the quantity of spacing post 26 is two, and two spacing posts 26 set up in sector 30 both sides, and during the actual installation, two spacing post 26's concrete mounted position adjusts according to the actual installation condition, and when making sector 30 spacing by the spacing post 26 of one side, rotate stopper 7 and can restrict the lift dog descends, when sector 30 rotatory back is spacing by the spacing post 26 of opposite side, the horizontal rotation direction of rotating stopper 7 quilt the lift dog is restricted.
In this embodiment, the maximum rotatable angle of the sector 30 enables the rotation limiting block 7 to be completely separated from the track sliding plate 23, so as to ensure that the lifting stop block can descend smoothly.
In this embodiment, the limiting columns 26 are pins.
It should be noted that the limiting column 26 also functions to prevent the sector 30 from disengaging from the gear ring 29, so as to avoid maintenance due to the tooth disengagement of the sector 30.
In this embodiment, the bottom of the guiding column 34 is also fixed on the mounting bottom plate 42, and the top of the guiding column 34 is also fixed on the mounting top plate 41, so as to ensure the stability of the whole structure.
In this embodiment, the bottom of the sector 30 contacts with the top of the installation top plate 41, so as to ensure the stability of the sector 30 during rotation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A light-shielding detection method for a liquid scintillation counter comprises a detection lead chamber (1), a light guide (2) arranged in the detection lead chamber (1), and two photomultiplier tubes arranged on two sides of the light guide (2), wherein a measurement chamber (3) with an open top is arranged in the detection lead chamber (1), and the measurement chamber (3) penetrates through the light guide (2), and is characterized by comprising the following steps:
step one, installing a light-shading interlocking device:
a light-proof interlocking device is installed, and a light-proof cover (4) in the light-proof interlocking device is in an opening and closing state; the light-proof interlocking device comprises a shell arranged outside the detection lead chamber (1), a light-proof cover (4) arranged at the top of the shell and used for sealing the measurement cavity (3), a sample moving mechanism arranged on the shell and used for controlling a sample bottle (5) to move in the measurement cavity (3), and a limiting mechanism connected between the light-proof cover (4) and the sample moving mechanism and used for limiting the movement of the light-proof cover (4) and the sample moving mechanism, wherein a clamping piece (6) inserted into the shell is arranged at the bottom of the light-proof cover (4), and a through hole matched with the light-proof cover (4) and a groove (27) for the clamping piece (6) to pass through are formed in the shell;
the sample moving mechanism comprises a lifting jacking mechanism, a lifting stop block, a pressure bar assembly, a locking device and a reset guide mechanism, wherein the lifting jacking mechanism extends into the measuring chamber (3) and is used for supporting a sample bottle (5), the lifting stop block is used for driving the lifting jacking mechanism to lift, the pressure bar assembly is used for pressing the lifting stop block downwards, the locking device is used for locking the pressure bar assembly, and the reset guide mechanism is used for resetting the lifting stop block upwards;
the limiting mechanism comprises a rotating limiting block (7) for limiting the lifting stop block to descend, the horizontal rotating direction of the rotating limiting block (7) is limited by the side wall of the lifting stop block, and the rotating limiting block (7) is in transmission connection with the light-shading cover (4) through a gear transmission mechanism; the rotating limiting block (7) is in a state of limiting the descending of the lifting stop block;
step two, lofting and sample introduction of a sample bottle:
step 201, lifting up and opening the light-shading cover (4), enabling the clamping piece (6) to penetrate through the groove (27) and be lifted out of the shell, placing the sample bottle (5) into the measuring chamber (3), enabling the sample bottle (5) to be located on the lifting jacking mechanism, and completing lofting of the sample bottle (5);
step 202, closing the light-shading cover (4), and enabling the clamping piece (6) to penetrate through the groove (27) to extend into the shell and to be matched with the gear transmission mechanism;
step 203, horizontally rotating the light-resistant cover (4), driving the rotation limiting block (7) to rotate through the gear rotating mechanism until the rotation limiting block (7) rotates away from a descending path of the lifting stop block, and removing the limitation on the lifting of the lifting stop block, wherein at the moment, the clamping piece (6) and the groove (27) are staggered, and the light-resistant cover (4) cannot be opened;
204, controlling the pressure lever assembly to press down the lifting stop block until the lifting jacking mechanism driven by the lifting stop block moves the sample bottle (5) downwards to a detection position in the light guide (2), and completing sample introduction of the sample bottle (5);
step three, light-proof locking of a light-proof cover:
the current position of the pressure lever assembly is locked by the locking device immediately after the sample bottle (5) is injected, so that the current position of the sample bottle (5) is locked; at the moment, the side wall of the lifting stop block limits the horizontal rotation of the rotation limiting block (7), so that the rotation of the light-avoiding cover (4) is limited, and the light-avoiding cover (4) is kept in a light-avoiding state which cannot be opened;
step four, sample detection:
the photomultiplier receives an optical signal generated by a radioactive sample in the sample bottle (5) under the excitation of scintillation liquid, converts the optical signal into an electrical signal and transmits the electrical signal to subsequent processing equipment for processing;
step five, releasing the light-proof locking of the light-proof cover and withdrawing the sample bottle:
step 501, after the sample is detected, unlocking the locking device to lock the pressure lever assembly;
step 502, moving the pressure lever assembly upwards, wherein the lifting stop block rises under the action of the reset guide mechanism, so that the sample bottle (5) on the lifting jacking mechanism is driven to move back to the position, in the step 201, after the sample bottle (5) is lofted, to complete the lofting of the sample bottle (5), and at the moment, the lifting stop block relieves the horizontal rotation limitation of the rotation limiting block (7), so that the rotation limitation of the light-proof cover (4) is relieved, namely the light-proof locking of the light-proof cover is relieved;
step six, sample discharging of the sample bottle:
and (3) reversely rotating the light-proof cover (4) to enable the clamping piece (6) to be positioned under the groove (27), lifting up to open the light-proof cover (4), taking out the sample bottle (5), and finishing the sample outlet of the sample bottle.
2. The light-shielding detection method for the liquid scintillation counter according to claim 1, characterized in that: in the first step, the shell is provided with a top panel (8) used for installing the light-shading cover (4) and an inclined side panel (9) used for installing the pressure bar assembly, the top of the inclined side panel (9) is connected with the top panel (8), the inclined side panel (9) inclines towards the direction far away from the detection lead chamber (1), the through hole and the groove (27) are formed in the top panel (8), and the groove (27) is communicated with the through hole.
3. The light-shielding detection method for the liquid scintillation counter according to claim 2, characterized in that: the depression bar subassembly is including installing installation panel (10) on oblique side board (9), set up at guide rail (11) of installation panel (10) inboard, and stretch into in installation panel (10) and along guide rail (11) gliding horizontal depression bar (12) from top to bottom, the axis of guide rail (11) is parallel with oblique side board (9), horizontal depression bar (12) are close to the fixed handle (13) that is provided with of one end of installation panel (10), handle (13) pass installation panel (10) and stretch out outside oblique side board (9), the central line perpendicular to installation panel (10) of handle (13), set up the direction rectangular hole (14) that supply handle (13) to slide on installation panel (10).
4. The light-shielding detection method for the liquid scintillation counter according to claim 3, characterized in that: locking device establishes locking spring (17) and installation sleeve pipe (18) on handle (13) including the cover, installation sleeve pipe (18) stretch into in installation panel (10) and compress tightly locking spring (17) on horizontal depression bar (12) of handle (13) bottom, the pot head that installation sleeve pipe (18) stretched into in installation panel (10) is equipped with butt at first snap ring (19) of installation panel (10) inboard and set up second snap ring (20) of keeping away from installation panel (10) one side at first snap ring (19), the external diameter of first snap ring (19) is greater than the width of direction rectangular hole (14), the external diameter of second snap ring (20) is greater than the external diameter of first snap ring (19), set up locking hole (21) with direction rectangular hole (14) intercommunication on installation panel (10), locking hole (21) are seted up in the bottom of direction rectangular hole (14), the aperture of locking hole (21) is greater than the external diameter of first snap ring (19) and is less than the outer snap ring (20) of second snap ring (20) And (4) diameter.
5. The light-shielding detection method for the liquid scintillation counter according to claim 3, characterized in that: the lifting stop block comprises a rail sliding plate (23) for horizontal movement of a horizontal compression rod (12), a limiting vertical plate (24) which is arranged on the rail sliding plate (23) and used for limiting a rotation limiting block (7) to horizontally rotate, and guide post mounting seats (25) which are arranged at two ends of the limiting vertical plate (24) and used for mounting the reset guide mechanism.
6. The light-shielding detection method for the liquid scintillation counter according to claim 1, characterized in that: the gear transmission mechanism comprises a rotating shaft (28) used for installing a rotation limiting block (7), a gear ring (29) which is arranged at the top of the detection lead chamber (1) and is driven to rotate by the light-shading cover (4), and a sector (30) which is fixed on the rotating shaft (28) and is in transmission connection with the gear ring (29).
7. The light-shielding detection method for the liquid scintillation counter according to claim 6, characterized in that: be provided with between gear ring (29) and light-resistant lid (4) and fix gland (32) on gear ring (29), seted up on gland (32) with fastener (6) complex draw-in groove (33), fastener (6) insert in draw-in groove (33) and drive gear ring (29) and rotate.
8. The light-shielding detection method for the liquid scintillation counter according to claim 5, characterized in that: the reset guide mechanism comprises a guide post (34) arranged in the guide post mounting seat (25) in a penetrating mode and a first reset spring (35) which is sleeved on the guide post (34) on the lower portion of the guide post mounting seat (25) and used for resetting upwards the lifting stop block.
9. The light-shielding detection method for the liquid scintillation counter according to claim 1, characterized in that: the lifting jacking mechanism comprises a mandril (36) extending into the measuring chamber (3), a bearing seat (37) arranged at the top of the mandril (36) and used for bearing a sample bottle (5), and a connecting rod (38) used for connecting the mandril (36) with the lifting stop block, wherein a sealing ring (39) is arranged at the top of the bearing seat (37), and a second reset spring (40) is sleeved on the mandril (36).
10. The light-shielding detection method for the liquid scintillation counter according to claim 6, characterized in that: the top of the rotating shaft (28) is fixed on the mounting top plate (41), the bottom of the rotating shaft (28) is fixed on the mounting bottom plate (42), and the mounting top plate (41) is provided with a limiting column (26) used for limiting the rotating angle of the sector (30).
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| CN113267804B (en) | 2022-02-08 |
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