CN211148934U - Afterglow test mechanism of scintillator - Google Patents
Afterglow test mechanism of scintillator Download PDFInfo
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- CN211148934U CN211148934U CN201921843046.4U CN201921843046U CN211148934U CN 211148934 U CN211148934 U CN 211148934U CN 201921843046 U CN201921843046 U CN 201921843046U CN 211148934 U CN211148934 U CN 211148934U
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- sliding block
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Abstract
The utility model provides an afterglow accredited testing organization of scintillation body, including platform (1), carousel (2), rocker (4), metal sliding block (5), track (6), ray generator and afterglow detector, a serial communication port, carousel (2) and track (6) install platform (1), platform (1) on open and to have platform logical groove (7), the afterglow detector be used for receiving the afterglow of being surveyed the scintillation body, when carrying out the afterglow test, carousel (2) at the uniform velocity rotate, drive metal sliding block (5) periodically cover the top that leads to the groove at the platform. The utility model discloses an afterglow accredited testing organization of scintillation body adopts the circulation at the uniform velocity to rotate link mechanism and drives metal sliding block and control the break-make that surveyed the scintillation body and receive the ray, and the break-make time can be adjusted, enables more even stability of shining of ray.
Description
Technical Field
The utility model relates to a ray detection technical field, in particular to afterglow accredited testing organization of scintillator.
Background
In an X-ray inspection system, the problem of afterglow of a detector based on cesium iodide crystals is serious, and particularly, the detector has a great influence on an image penetration index. In order to improve the performance index of the X-ray inspection system, the afterglow of the detector needs to be tested, and the afterglow is used for screening the detector or afterglow subtraction in image data calculation.
In the prior art, 1) an afterglow testing device generally adopts a belt to drive a metal slide block to simulate the process that X rays are quickly shielded. The metal sliding block is accelerated and started each time, passes through the gap at a set speed at a constant speed in front of the X-ray gap, then stops and automatically returns to the starting position. Photoelectric sensors are arranged in front of and behind the gap for transmitting the X-ray at a certain distance to sense the position of the metal slide block and start and stop the X-ray source. In each test, the metal slide block has a starting and stopping process, and the motion of the metal slide block is not easy to control stably. The X-ray source also has a starting and stopping process, the working efficiency is low, and the dosage received by the afterglow detector at each time has deviation, so that the afterglow test data is inaccurate; 2) chinese patent document CN107861146A discloses an afterglow testing mechanism for scintillators, which uses a rotor to turn on and off the radiation, and the through grooves of the radiation are radially arranged and pass through the center of the rotor. This patent document also finds that if the through groove is a straight groove, the radiation is not immediately turned off due to the rotation of the rotating body, and there is a change in the intensity of the radiation due to a change in thickness. Although this patent document also finds this problem and uses the trumpet-shaped slot to compensate, it still has the defects of complex structure of the rotator, high processing difficulty and difficult alignment control.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an afterglow accredited testing organization of scintillation adopts the circulation at the uniform velocity to rotate link mechanism and drives metal slide and control the break-make that is surveyed scintillator and receive the ray, and the break-make time can be adjusted, enables more even stability of shining of ray.
The utility model relates to an afterglow testing mechanism of a scintillator, which comprises a platform, a turntable, a rocker, a metal slider, a track, a ray generator and an afterglow detector, and is characterized in that,
the turntable and the track are arranged on the platform, the rotating shaft of the turntable is vertical to the platform, one end of the rocker is hinged at the circumferential edge of the turntable, the other end of the rocker is hinged at the side surface of the metal sliding block, the lower surface of the metal sliding block is provided with a sliding groove matched with the track, the metal sliding block can slide along the track, the turntable, the rocker and the metal sliding block form a centering crank sliding block mechanism,
the platform is provided with a platform through groove, the scintillator to be tested is arranged right below the platform through groove, the ray generator is arranged right above the platform through groove, rays emitted by the ray generator can penetrate through the platform through groove to irradiate on the scintillator to be tested,
the afterglow detector is used for receiving the afterglow of the scintillator to be detected,
when the afterglow test is carried out, the turntable rotates at a constant speed to drive the metal sliding block to periodically cover the upper part of the through groove of the platform.
Furthermore, the device also comprises a rocker length adjuster which is arranged on the rocker and used for finely adjusting the length of the rocker.
Furthermore, the rocker length adjuster is provided with an upper opening and a lower opening, internal threads with opposite rotation directions are respectively arranged in the upper opening and the lower opening, the rocker is divided into an upper section and a lower section, one end of the lower section is hinged to the edge of the circumference of the turntable, the other end of the lower section is provided with external threads and screwed into the lower opening of the rocker length adjuster, one end of the upper section is provided with external threads and screwed into the upper opening of the rocker length adjuster, and the other end of the upper section is hinged to the side face of the metal sliding block.
Furthermore, the turntable also comprises a motor, and the turntable rotates at a constant speed under the driving of the motor.
The utility model has the advantages that 1) the afterglow test mechanism of the scintillator has the advantages that the circulating constant-speed rotating connecting rod mechanism drives the metal slide block to control the on-off of the measured scintillator for receiving the ray, the dosage of the passed ray is more stable, and the on-off is more rapid and uniform; 2) the connecting rod mechanism for driving the sliding block is a centering crank sliding block mechanism, and a rotating disc serving as a crank rotates at a constant speed under the driving of a motor, so that the motion stability of the metal sliding block can be ensured; 3) the rocker of the crank sliding block mechanism is provided with a length fine adjustment device, so that the position relation between the sliding block and the platform through groove can be accurately adjusted, and the accuracy of afterglow testing is improved.
Drawings
Fig. 1 is a schematic structural diagram of an afterglow testing mechanism of a scintillator according to the present invention.
In the figure, 1 platform, 2 turntables, 3 rocker length adjusters, 4 rockers, 5 metal sliding blocks, 6 tracks and 7 platform through grooves.
Detailed Description
The following describes the technical solution of the present invention with reference to the drawings.
As shown in the attached drawing 1, the afterglow testing mechanism of the scintillator of the utility model comprises a platform 1, a turntable 2, a rocker length adjuster 3, a rocker 4, a metal slider 5, a track 6, a ray generator, an afterglow detector and a motor.
The turntable 2 and the track 6 are arranged on the platform 1, the rotating shaft of the turntable 2 is vertical to the platform 1, and the turntable 2 rotates at a constant speed under the driving of the motor. One end of the rocker 4 is hinged to the circumferential edge of the turntable 2, the other end of the rocker 4 is hinged to the side face of the metal sliding block 5, a sliding groove matched with the rail is formed in the lower surface of the metal sliding block 5, the metal sliding block 5 can slide along the rail 6, and the turntable 2, the rocker 4 and the metal sliding block 5 form a centering type crank sliding block mechanism. When the turntable rotates at a constant speed, the metal slide block 5 can move more stably by adopting the centering type crank slide block mechanism.
The rocker length adjuster 3 is used for finely adjusting the length of the rocker 4. The rocker length adjuster 3 is provided with an upper opening and a lower opening, internal threads with opposite screwing directions are respectively arranged in the upper opening and the lower opening, the rocker 4 is divided into an upper section and a lower section, one end of the lower section is hinged to the edge of the circumference of the turntable 2, the other end of the lower section is provided with external threads and is screwed into the lower opening of the rocker length adjuster 3, one end of the upper section is provided with the external threads and is screwed into the upper opening of the rocker length adjuster 3, and the other end of the upper section is hinged to the side face of the metal sliding block 5.
The metal slide block 5 is arranged on the upper surface of the metal slide block,
a finely adjustable rocker length adjuster 3 is achieved.
The afterglow detector is used for receiving the afterglow of the scintillator to be detected.
During afterglow test, the turntable 2 rotates at a constant speed to drive the metal slide block 5 to periodically cover the upper part of the through groove of the platform.
Right the utility model discloses a testing arrangement's concrete embodiment mechanism's motion carries out the analysis, and the rotation axle center of carousel 2 is a to 4 fixed point distances of rocker. When the metal sliding block 5 is positioned at the uppermost position, the axis of the rotary table 2, the connection point of the rotary table 2 and the rocker 4, and the connection point of the rocker 4 and the metal sliding block 5 are on the same straight line. When the metal sliding block 5 is at the uppermost limit position, the lower edge is at a certain distance from the through groove 9 of the platform. The width of the platform through groove 9 is such that the size of the through groove ensures that the transmitted X-ray covers the width of the detector and is far smaller than a. The width of the metal slider 5 is b, and b is greater than 2 a.
The ray generator is an X-ray source and is positioned vertically above the platform through groove 7, and the rays cover the length of the whole platform through groove 7. The turntable 2 rotates at a constant angular velocity ω. And the X-ray source continuously emits rays, and in the process that the turntable 2 rotates from the point N to the point P and then to the point Q, the metal sliding block 5 covers the platform through groove 9, blocks the X-rays and moves to the lowest position of the metal sliding block 5. When the turntable 2 continues to turn from the point Q to the point M and returns to the point N, the metal sliding block 5 breaks away from shielding the through groove 7 of the platform again and penetrates through X rays. During one revolution of the turntable 2, the X-rays are blocked 1 time.
The rotating disk 2 rotates just 90 degrees from the point N to the point P, and the metal slide 5 moves by the following distance:
then when h is 2 a: s ═ 1.268 a; when h is 3 a: s ═ 1.172 a; when h is 4 a: and S is 1.127 a.
It can be seen that when the hinge point of the rocker 4 on the turntable 2 is rotated by 90 ° from the illustrated vertex, the metal slider 5 moves a distance greater than a, and as the length of the rocker 4 increases, the distance decreases and approaches a; and the moving speed of the metal slider 5 approaches a omega from being larger than a omega. Therefore, the length of the rocker length adjuster 3 of the rocker 4 can be adjusted, the speed of the reciprocating process of the metal sliding block 5 can be changed, and the position of the metal sliding block 5 can be accurately adjusted.
Although the present invention has been described in connection with the preferred embodiments, the embodiments are not intended to limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of protection of the invention should therefore be determined with reference to the claims that follow.
Claims (4)
1. An afterglow test mechanism of a scintillator, which comprises a platform (1), a turntable (2), a rocker (4), a metal sliding block (5), a track (6), a ray generator and an afterglow detector, and is characterized in that,
the turntable (2) and the track (6) are installed on the platform (1), the rotating shaft of the turntable (2) is perpendicular to the platform (1), one end of the rocker (4) is hinged at the circumferential edge of the turntable (2), the other end of the rocker (4) is hinged at the side surface of the metal sliding block (5), the lower surface of the metal sliding block (5) is provided with a sliding groove matched with the track, the metal sliding block (5) can slide along the track (6), and the turntable (2), the rocker (4) and the metal sliding block (5) form a centering crank sliding block mechanism,
a platform through groove (7) is formed in the platform (1), a scintillator to be detected is placed under the platform through groove (7), the ray generator is installed right above the platform through groove (7), rays emitted by the ray generator can penetrate through the platform through groove (7) to irradiate on the scintillator to be detected,
the afterglow detector is used for receiving the afterglow of the scintillator to be detected,
when the afterglow test is carried out, the turntable (2) rotates at a constant speed to drive the metal sliding blocks (5) to periodically cover the upper part of the through groove of the platform.
2. An afterglow testing mechanism of a scintillator as claimed in claim 1, further comprising a rocker length adjuster (3), said rocker length adjuster (3) being mounted on the rocker (4) for fine tuning the length of the rocker (4).
3. The afterglow testing mechanism of a scintillator according to claim 2, wherein the rocker length adjuster (3) has an upper opening and a lower opening, the upper opening and the lower opening have internal threads with opposite rotation directions, respectively, the rocker (4) is divided into an upper section and a lower section, one end of the lower section is hinged at the circumferential edge of the turntable (2), the other end of the lower section has external threads and is screwed into the lower opening of the rocker length adjuster (3), one end of the upper section has external threads and is screwed into the upper opening of the rocker length adjuster (3), and the other end of the upper section is hinged at the side of the metal sliding block (5).
4. An afterglow testing mechanism of a scintillator as claimed in claim 3, further comprising a motor, wherein said rotating disc (2) is driven by the motor to rotate at a constant speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843046.4U CN211148934U (en) | 2019-10-30 | 2019-10-30 | Afterglow test mechanism of scintillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843046.4U CN211148934U (en) | 2019-10-30 | 2019-10-30 | Afterglow test mechanism of scintillator |
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| CN211148934U true CN211148934U (en) | 2020-07-31 |
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| CN201921843046.4U Active CN211148934U (en) | 2019-10-30 | 2019-10-30 | Afterglow test mechanism of scintillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609314A (en) * | 2019-10-30 | 2019-12-24 | 北京物资学院 | Afterglow testing device for scintillator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609314A (en) * | 2019-10-30 | 2019-12-24 | 北京物资学院 | Afterglow testing device for scintillator |
| CN110609314B (en) * | 2019-10-30 | 2024-07-02 | 北京物资学院 | Afterglow testing device of scintillator |
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