An automatically openable and closable lead chamber for a liquid scintillation spectrometer

Abstract

The utility model provides a kind of automatically openable and closable lead room of liquid scintillation spectrometer, including lead room main part and lead plug, the bottom side of lead plug is connect with encapsulated bearing and is distributed, encapsulated bearing is contacted with the recess surface of lead room main part, when lead plug opens and closes, encapsulated bearing rolls on recess surface;The lower surface of sample system base is fixed with light shielding bubble cotton, the bottom surface of light shielding bubble cotton is closely attached with the upper surface of automatically openable and closable lead room, during the process of lead plug opening and closing, the bottom surface of light shielding bubble cotton always covers the junction of lead room main part and lead plug, sample inlet is also provided on light shielding bubble cotton, the sample inlet on light shielding bubble cotton is coaxially arranged with the sample inlet on lead room main part and is same in diameter. By installing rolling encapsulated bearing on lead plug, avoid the scratch of lead plug and lead room main part;Meanwhile, through the step form cooperation of lead plug and lead room main part and the setting of light shielding bubble cotton, the gap of lead plug and lead room main part is sealed, the whole light shielding of sample introduction process is realized.

Description

Technical Field

[0001] This utility model relates to the field of liquid scintillation spectrometer technology, and in particular to an automatically opening and closing lead chamber for a liquid scintillation spectrometer. Background Technology

[0002] Low-background liquid scintillation spectrometers use liquid scintillators to receive radiation from the analyte and convert it into fluorescent photons. The light is then amplified and multiplied by photoelectric devices to form pulses. Finally, electronic circuits and software are used to process the pulses and obtain a series of waveforms, thus completing the measurement of the substance.

[0003] The lead chamber is a crucial component of a liquid scintillation spectrometer, shielding it from external radiation to prevent interference with measurement results. The applicant's previous patent application, CN223259885U, disclosed an automated sample introduction low-background liquid scintillation spectrometer. In this spectrometer, the lead chamber is automatically opened and closed by a lead plug drive mechanism. To prevent light exposure, a sealing element is installed within the groove of the lead chamber to seal the gap between the lead chamber and the lead plug. However, the lead plug has an outer steel and inner lead structure, making it quite heavy. Each automatic opening and closing causes friction and scraping between the lead plug and the main body of the lead chamber. Furthermore, this lead chamber cannot guarantee that the sample is completely protected from light during sample introduction. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, this utility model provides an automatically opening and closing lead chamber for a liquid scintillation spectrometer. By installing a rolling rubber-coated bearing on the lead plug, the scraping between the lead plug and the main body of the lead chamber is avoided. At the same time, the gap between the lead plug and the main body of the lead chamber is sealed by the stepped fit between the lead plug and the main body of the lead chamber and the setting of light-shielding foam, so as to achieve complete light protection during the sample introduction process.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] An automatically opening and closing lead chamber for a liquid scintillation spectrometer is located below a sample system base. The chamber includes a main body and a lead plug. A sample inlet is located on the main body, and a groove is formed at the top of the main body at the sample inlet. The lead plug is movably connected to the groove in the main body from the side. A lead plug driving mechanism connects the lead plug and the main body, driving the lead plug to open and close, thereby closing or exposing the sample inlet on the main body. Rubber-coated bearings are distributed on both sides of the bottom of the lead plug, contacting the groove surface of the main body. When the lead plug opens and closes, the rubber-coated bearings roll on the groove surface. A light-shielding foam is fixed to the lower surface of the sample system base, with its bottom surface tightly fitted to the upper surface of the automatically opening and closing lead chamber. During the opening and closing of the lead plug, the bottom surface of the light-shielding foam always covers the connection between the main body and the lead plug. A sample inlet is also provided on the light-shielding foam, coaxially arranged with the same diameter as the sample inlet on the main body.

[0007] The lead plug includes an upper sealing cover plate and a lower sealing slider connected to each other. The groove of the lead chamber body is provided with an upper sealing groove and a lower sliding groove. Rubber-coated bearings are installed on both sides of the lower sealing slider and contact the surface of the lower sliding groove. The upper sealing cover plate and the upper sealing groove are fitted in a stepped manner.

[0008] A proximity sensor is installed on the main body of the lead chamber to monitor the position of the lead plug.

[0009] The lead plug drive mechanism includes a mounting plate, a linear guide rail, a slider, a motor, and a lead screw. The mounting plate is fixed to the main body of the lead chamber. The linear guide rail is fixed to the mounting plate along the opening and closing direction of the lead plug. The slider is slidably mounted on the linear guide rail. The lead plug is fixedly connected to the slider. The lead screw is connected to the motor. The motor is fixed to the mounting plate. The slider is fixedly connected to the nut on the lead screw. The motor drives the nut on the lead screw to move linearly, thereby driving the lead plug to move horizontally and realizing the automatic opening and closing of the lead plug.

[0010] Both the proximity sensor and the motor are connected to the controller. The controller receives the monitoring signal from the proximity sensor and controls the motor drive, thereby controlling the opening range of the lead plug in the lead chamber.

[0011] The slider and the lead screw are fixedly connected by a connecting block. Two proximity sensors are arranged on the mounting plate along a straight line parallel to the linear guide rail, and the two proximity sensors are located on both sides of the connecting block.

[0012] Compared with the prior art, the beneficial effects of this utility model are: (1) The liquid scintillation spectrometer provided by this utility model can automatically open and close the lead chamber by installing a rolling rubber-coated bearing on the lead plug to avoid the scraping between the lead plug and the main body of the lead chamber; at the same time, by the step-shaped cooperation between the lead plug and the main body of the lead chamber and the setting of light-shielding foam, the gap between the lead plug and the main body of the lead chamber is sealed, which can achieve full light protection during the sample introduction process.

[0013] (2) The liquid scintillation spectrometer provided by the present invention can automatically open and close the lead chamber through the setting of the lead plug driving mechanism and the proximity sensor. Attached Figure Description

[0014] Figure 1 A schematic diagram showing the location layout of the automatically opening and closing lead chamber provided by this utility model;

[0015] Figure 2 A schematic diagram of the structure of the automatically opening and closing lead chamber provided by this utility model;

[0016] Figure 3 This is a front view of the lead plug installation in this utility model;

[0017] Figure 4 This is a top view of the lead plug installation in this utility model;

[0018] In the diagram, 1-Automatically opening and closing lead chamber, 11-Lead chamber body, 12-Lead plug, 13-Rubber-coated bearing, 14-Light-shielding foam, 15-Mounting plate, 16-Linear guide rail, 17-Slider, 18-Motor, 19-Connecting block, 2-Lead chamber frame base, 3-Sample system base, 4-Sample system, 5-Proximity sensor. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] In this embodiment, the automatically opening and closing lead chamber 1 of the liquid scintillation spectrometer is fixed on the lead chamber frame base 2 and located below the sample system base 3. The sample system 4, used to hold the sample, is installed on the sample system base. Figure 1 As shown.

[0021] The automatically opening and closing lead chamber includes a lead chamber body 11 and a lead plug 12, such as Figure 2 As shown, a sample inlet is provided on the main body of the lead chamber. A groove is provided on the top of the main body of the lead chamber at the sample inlet. A lead plug is movably connected to the groove of the main body of the lead chamber from the side. A lead plug driving mechanism is connected between the lead plug and the main body of the lead chamber. The lead plug is driven to open and close by the lead plug, thereby closing or exposing the sample inlet on the main body of the lead chamber. In this embodiment, rubber-coated bearings 13 are distributed and connected on both sides of the bottom of the lead plug, such as... Figure 3 and Figure 4As shown, the rubber-coated bearing contacts the grooved surface of the lead chamber body. When the lead plug opens and closes, the rubber-coated bearing rolls on the grooved surface, preventing scratching between the lead chamber body and the lead plug. Specifically, the lead plug includes an upper sealing cover plate and a lower sealing slider connected to each other. The groove of the lead chamber body is correspondingly provided with an upper sealing groove and a lower sliding groove. The rubber-coated bearing is installed on both sides of the lower sealing slider and contacts the surface of the lower sliding groove. The upper sealing cover plate and the upper sealing groove are fitted in a stepped manner to initially seal the large gap between the two sides of the lead plug and the lead chamber body after the rubber-coated bearing is installed. It should be noted that the width of the lower sliding groove should be greater than the distance between the two rubber-coated bearings to prevent the rubber-coated bearing from contacting the side wall of the lead chamber body.

[0022] In this embodiment, a light-shielding foam 14 is fixed to the lower surface of the sample system base. The bottom surface of the light-shielding foam is tightly fitted to the upper surface of the automatically opening and closing lead chamber. During the opening and closing of the lead plug, the bottom surface of the light-shielding foam always covers the connection between the lead chamber body and the lead plug. A sample inlet is also provided on the light-shielding foam. The sample inlet on the light-shielding foam is coaxially arranged with the same diameter as the sample inlet on the lead chamber body. The light-shielding foam further seals and blocks light from the gap between the lead plug and the lead chamber body. During sample injection, the lead plug rolls open, and the sample passes from top to bottom through the sample system base, then through the sample inlet on the light-shielding foam, and finally into the sample inlet on the lead chamber body. A light-shielding space is formed between the sample system base, the light-shielding foam, the lead chamber body, and the lead plug, achieving complete light protection for the sample during the injection process.

[0023] In this embodiment, the lead plug driving mechanism includes a mounting plate 15, a linear guide rail 16, a slider 17, a motor 18, and a lead screw. The mounting plate is fixed to the main body of the lead chamber, the linear guide rail is fixed to the mounting plate along the opening and closing direction of the lead plug, the slider is slidably mounted on the linear guide rail, the lead plug is fixedly connected to the slider, the lead screw is connected to the motor, the motor is fixed to the mounting plate, and the slider is fixedly connected to the nut on the lead screw. The motor drives the nut on the lead screw to move linearly, thereby driving the lead plug to move horizontally and realizing the automatic opening and closing of the lead plug.

[0024] In this embodiment, the slider and the lead screw are fixedly connected by a connecting block 19. Two proximity sensors 5 are arranged on the mounting plate along a straight line parallel to the linear guide rail, and the two proximity sensors are located on both sides of the connecting block. The two proximity sensors monitor the position of the connecting block (i.e., the position of the lead plug) and control the opening and closing of the lead plug respectively. Specifically, the proximity sensors and the motor are both connected to a controller. The controller receives the monitoring signals from the proximity sensors and controls the motor drive, thereby controlling the opening range of the lead plug in the lead chamber.

Claims

1. An automatically opening and closing lead chamber for a liquid scintillation spectrometer, the automatically opening and closing lead chamber being located below a sample system base, comprising a lead chamber body and a lead plug, a sample inlet being provided on the lead chamber body, a groove being provided on the top of the lead chamber body at the sample inlet, the lead plug being movably connected to the groove of the lead chamber body from the side, a lead plug driving mechanism being connected between the lead plug and the lead chamber body, the lead plug being driven to open and close by the lead plug driving mechanism, thereby closing or exposing the sample inlet on the lead chamber body, characterized in that: Rubber-coated bearings are distributed on both sides of the bottom of the lead plug. The rubber-coated bearings are in contact with the groove surface of the lead chamber body. When the lead plug is opened and closed, the rubber-coated bearings roll on the groove surface. Light-shielding foam is fixed on the lower surface of the sample system base. The bottom surface of the light-shielding foam is tightly fitted with the upper surface of the automatically opening and closing lead chamber. During the opening and closing of the lead plug, the bottom surface of the light-shielding foam always covers the connection between the lead chamber body and the lead plug. A sample inlet is also provided on the light-shielding foam. The sample inlet on the light-shielding foam is coaxially arranged with the same diameter as the sample inlet on the lead chamber body.

2. The automatically opening and closing lead chamber of the liquid scintillation spectrometer according to claim 1, characterized in that: The lead plug includes an upper sealing cover plate and a lower sealing slider connected to each other. The groove of the lead chamber body is provided with an upper sealing groove and a lower sliding groove. Rubber-coated bearings are installed on both sides of the lower sealing slider and contact the surface of the lower sliding groove. The upper sealing cover plate and the upper sealing groove are fitted in a stepped manner.

3. The automatically opening and closing lead chamber of the liquid scintillation spectrometer according to claim 1, characterized in that: A proximity sensor is installed on the main body of the lead chamber to monitor the position of the lead plug.

4. The automatically opening and closing lead chamber of the liquid scintillation spectrometer according to claim 3, characterized in that: The lead plug drive mechanism includes a mounting plate, a linear guide rail, a slider, a motor, and a lead screw. The mounting plate is fixed to the main body of the lead chamber. The linear guide rail is fixed to the mounting plate along the opening and closing direction of the lead plug. The slider is slidably mounted on the linear guide rail. The lead plug is fixedly connected to the slider. The lead screw is connected to the motor. The motor is fixed to the mounting plate. The slider is fixedly connected to the nut on the lead screw. The motor drives the nut on the lead screw to move linearly, thereby driving the lead plug to move horizontally and realizing the automatic opening and closing of the lead plug.

5. The automatically opening and closing lead chamber of the liquid scintillation spectrometer according to claim 4, characterized in that: Both the proximity sensor and the motor are connected to the controller. The controller receives the monitoring signal from the proximity sensor and controls the motor drive, thereby controlling the opening range of the lead plug in the lead chamber.

6. The automatically opening and closing lead chamber of the liquid scintillation spectrometer according to claim 4, characterized in that: The slider and the lead screw are fixedly connected by a connecting block. Two proximity sensors are arranged on the mounting plate along a straight line parallel to the linear guide rail, and the two proximity sensors are located on both sides of the connecting block.

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