Ultra-low background solution flash spectrometer light shielding device

Abstract

The utility model discloses an ultra-low background liquid flash spectrometer light-shielding device which comprises a light-shielding device fixing frame fixed on a control cabinet top plate of an ultra-low background liquid flash spectrometer, a sliding rail is arranged on the light-shielding device fixing frame, a first clamping hand and a second clamping hand are installed on the sliding rail, and the front end of the first clamping hand and the front end of the second clamping hand are respectively provided with a semicircular grabbing and clamping part. A first silica gel semi-ring and a second silica gel semi-ring are arranged on the grabbing and clamping portion of the first clamping hand and the grabbing and clamping portion of the second clamping hand respectively, and when the first clamping hand and the second clamping hand slide and are folded along the sliding rail, the first silica gel semi-ring and the second silica gel semi-ring are folded to form a closed silica gel ring. The ultra-low background liquid flash spectrometer is used for being installed at a sample injection hole of the ultra-low background liquid flash spectrometer, background reduction caused by light interference during measurement is effectively avoided, and the precision of a measurement result can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of radioactive measurement equipment, in particular to a light-shielding device for an ultra-low background liquid scintillation spectrometer. Background Art

[0002] Liquid scintillation spectrometers are widely used in industry, agriculture, biomedicine, environmental science, archaeology and geology. Liquid scintillation spectrometers can be used to measure α and β radionuclides, such as 3 H. 14 C. 32 P. 90 Sr, total alpha, total beta, etc.

[0003] The current liquid scintillation spectrometer can usually only test one sample at a time, and each time the sample needs to be manually sent and sampled. During the measurement process, the liquid scintillation spectrometer is extremely sensitive to light. The process is cumbersome and it is easy to contaminate the sample, resulting in a decrease in test accuracy.

[0004] Therefore, how to improve the automation and measurement accuracy of liquid scintillation spectrometer equipment is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, the utility model provides a light-shielding device for an ultra-low background liquid scintillation spectrometer, which is used to be installed at the injection hole of the ultra-low background liquid scintillation spectrometer, effectively avoiding light interference during measurement and reducing the background, and can greatly improve the accuracy of the measurement results.

[0006] The utility model embodiment provides the following scheme:

[0007] An embodiment of the utility model provides a light-shielding device for an ultra-low background liquid scintillation spectrometer, comprising a light-shielding device fixing frame fixed to a top plate of a control cabinet of the ultra-low background liquid scintillation spectrometer, a slide rail being provided on the light-shielding device fixing frame, a first clamping hand and a second clamping hand being installed on the slide rail, a semicircular gripping portion being provided at the front end of the first clamping hand and the second clamping hand respectively, a first silicone half circle and a second silicone half circle being provided at the gripping portion of the first clamping hand and the gripping portion of the second clamping hand respectively, when the first clamping hand and the second clamping hand slide and close along the slide rail, the first silicone half circle and the second silicone half circle close to form a closed silicone circle.

[0008] In an optional embodiment, the first gripper and the second gripper are driven to slide along the slide rail by a rack and pinion mechanism installed on a light shielding device fixing frame.

[0009] In an optional embodiment, the rack and pinion mechanism is controlled and operated by a motor installed on a fixing frame of the light shielding device.

[0010] In an optional embodiment, the light shielding device fixing frame is provided with a photoelectric switch and a photoelectric switch baffle electrically connected to the motor.

[0011] In an alternative embodiment, both the motor and the photoelectric switch are electrically connected to the control system in the control cabinet.

[0012] In an alternative embodiment, the light-shielding device fixing frame is provided with a sliding limit strip parallel to the slide rail.

[0013] In an alternative embodiment, the inner wall of the silica gel ring has a spiral structure.

[0014] The beneficial effects of the present utility model based on its technical solution are as follows:

[0015] (1) The light-shielding device of the ultra-low background liquid scintillation spectrometer provided by the present utility model is structurally compact and efficient. When the vertical sampling device of the ultra-low background liquid scintillation spectrometer pushes the sample bottle into the sampling slideway, the silica gel ring can effectively wrap the sample bottle, effectively avoiding light interference during measurement and reducing the background, and can greatly improve the accuracy of the measurement result;

[0016] (2) The sliding limit strip of the light-shielding device of the ultra-low background liquid scintillation spectrometer provided by the present utility model can assist in restricting the sliding range of the first clamp and the second clamp;

[0017] (3) The combination of the photoelectric switch and the photoelectric switch baffle of the light-shielding device of the ultra-low background liquid scintillation spectrometer provided by the present utility model can be used to identify the position state of the sample bottle. When the sample bottle is translated below the sampling slideway and blocks the photoelectric switch baffle, the photoelectric switch can be triggered to control the motor to drive the rack and pinion movement, driving the first clamp and the second clamp to move towards each other, preparing for sample injection and light shielding, and realizing the overall automation of the device. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of this specification. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of a light-shielding device provided by the present utility model.

[0020] Figure 2 It is a schematic diagram of the overall internal structure of the ultra-low background liquid scintillation spectrometer.

[0021] Figure 3 It is a schematic sectional view of the ultra-low background liquid scintillation spectrometer.

[0022] Figure 4 It is a three-dimensional schematic sectional view of the ultra-low background liquid scintillation spectrometer.

[0023] Figure 5 Schematic diagram of the horizontal rotation sampling device for an ultra-low background liquid scintillation spectrometer.

[0024] Figure 6 It is a schematic diagram of the installation of a light-shielding device provided by the present utility model.

[0025] Figure 7 It is a schematic diagram of the overall exterior of an ultra-low background liquid scintillation spectrometer.

[0026] In the figure: 1 - detector, 2 - horizontal rotation sampling device, 21 - horizontal sampling fixed frame, 22 - sample tray, 23 - sample box, 24 - sample bottle, 25 - sequence label, 26 - motor module, 3 - vertical sampling device, 4 - control cabinet, 5 - locking wheel, 6 - sampling chute, 7 - light-shielding device, 71 - light-shielding device fixed frame, 72 - motor, 73 - sliding limit bar, 74 - rack and pinion mechanism, 75 - slide rail, 76 - second silicone half-ring, 77 - second gripper, 78 - first gripper, 79 - first silicone half-ring, 710 - photoelectric switch baffle, 711 - photoelectric switch. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the embodiments of the present utility model.

[0028] Referring to Figures 1 to 7 , this embodiment provides an ultra-low background liquid scintillation spectrometer light-shielding device 7 for installation in an ultra-low background liquid scintillation spectrometer. The ultra-low background liquid scintillation spectrometer generally includes a detector 1 at the upper part and a control cabinet 4 with a control system built therein at the lower part. A constant temperature air conditioner is provided inside the control cabinet, and a locking wheel 5 is provided at the bottom of the control cabinet. A horizontal rotation sampling device 2 is provided under the detector. The horizontal rotation sampling device includes a horizontal sampling fixed frame 21 fixed under the top plate of the control cabinet and a sample tray 22 installed on the horizontal sampling fixed frame and controlled to rotate by a motor module 26. A sample box 23 for placing sample bottles 24 is provided circumferentially on the sample tray. A sequence label 25 can be set on the sample bottle. A sampling hole communicating with the sampling chute 6 at the bottom of the detector is provided on the top plate of the control cabinet, and a vertical sampling device 3 for vertically pushing the sample bottle into the sampling chute 6 through the sampling hole is provided under the horizontal rotation sampling device. The vertical sampling device adopts a slide table module. When the horizontal rotation sampling device rotates one of the sample bottles to directly below the sampling chute and the sampling hole of the detector, the sampling ejector rod of the slide table module can vertically push the sample bottle into the sampling chute through the sampling hole.

[0029] The light-shielding device 7 of the ultra-low background liquid scintillation spectrometer is installed at the sample injection hole on the top plate of the control cabinet.

[0030] The light-shielding device 7 of the ultra-low background liquid scintillation spectrometer includes a light-shielding device fixing bracket 71 fixed to the top plate of the control cabinet 4 of the ultra-low background liquid scintillation spectrometer. A slide rail 75 is provided on the light-shielding device fixing bracket. A first clamping hand 78 and a second clamping hand 77 are installed on the slide rail. Semi-circular clamping parts are respectively provided at the front ends of the first clamping hand and the second clamping hand. A first silicone half-ring 79 and a second silicone half-ring 76 are respectively provided on the clamping parts of the first clamping hand and the second clamping hand. When the first clamping hand and the second clamping hand slide and close along the slide rail, the first silicone half-ring and the second silicone half-ring close to form a closed silicone ring.

[0031] The first clamping hand and the second clamping hand are driven to slide along the slide rail by a rack and pinion mechanism 74 installed on the light-shielding device fixing bracket.

[0032] The light-shielding device fixing bracket is provided with a sliding limit bar 73 parallel to the slide rail, as well as a photoelectric switch 711 and a photoelectric switch baffle 710.

[0033] The motor and the photoelectric switch are both electrically connected to the control system in the control cabinet.

[0034] The working principle of the present utility model is as follows:

[0035] (1) The horizontal rotation sample injection device 2 rotates the sample bottle 24 to be detected to directly below the sample injection slideway 6 of the detector 1.

[0036] (2) The first clamping hand 78 and the second clamping hand 79 of the light-shielding device 7 are clamped, so that the first silicone half-ring 79 and the second silicone half-ring 76 are combined into a complete silicone ring, and the upper and lower edges of the silicone ring are respectively in virtual contact with the bottom of the sample injection slideway and the top of the sample bottle 24.

[0037] (3) The sample injection ejector rod of the vertical sample injection device 3 is pushed upward, and the sample bottle 24 is sent into the detector through the sample injection slideway. During the whole process, the silicone ring tightly wraps the sample bottle, effectively avoiding the influence of light on the sample bottle.

[0038] A light-shielding device of an ultra-low background liquid scintillation spectrometer provided by the present utility model is used to be installed at the sample injection hole of the ultra-low background liquid scintillation spectrometer, effectively avoiding being interfered by light during measurement and reducing the background, and can greatly improve the accuracy of the measurement result.

Claims

1. A light shielding device for an ultra-low background liquid scintillation spectrometer, comprising a light shielding device fixing frame (71) fixed to a top plate of a control cabinet (4) of the ultra-low background liquid scintillation spectrometer, characterized in that: A slide rail (75) is provided on the light-shielding device fixing frame, and a first clamping hand (78) and a second clamping hand (77) are installed on the slide rail. The front ends of the first clamping hand and the second clamping hand are respectively provided with semicircular gripping parts, and the gripping parts of the first clamping hand and the second clamping hand are respectively provided with a first silicone half circle (79) and a second silicone half circle (76). When the first clamping hand and the second clamping hand slide and close along the slide rail, the first silicone half circle and the second silicone half circle close together to form a closed silicone circle.

2. The light-shielding device for ultra-low background liquid scintillation spectrometer according to claim 1, characterized in that: The first gripper and the second gripper are driven to slide along the slide rail by a rack and pinion mechanism (74) installed on a light shielding device fixing frame.

3. The light-shielding device for ultra-low background liquid scintillation spectrometer according to claim 2, characterized in that: The rack and pinion mechanism is controlled and operated by a motor (72) installed on a light shielding device fixing frame.

4. The light shielding device for ultra-low background liquid scintillation spectrometer according to claim 1, characterized in that: The light-shielding device fixing frame is provided with a photoelectric switch (711) and a photoelectric switch baffle (710) electrically connected to the motor.

5. The light shielding device for ultra-low background liquid scintillation spectrometer according to claim 3 or 4, characterized in that: The motor and the photoelectric switch are both electrically connected to the control system in the control cabinet.

6. The light shielding device for ultra-low background liquid scintillation spectrometer according to claim 1, characterized in that: The light-shielding device fixing frame is provided with a sliding limit strip (73) parallel to the slide rail.

7. The light shielding device for ultra-low background liquid scintillation spectrometer according to claim 1, characterized in that: The inner wall of the silicone ring has a spiral structure.

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