Sample presser for near-infrared volatile liquid analysis

Abstract

The invention discloses a sample pressing device for near-infrared volatile liquid analysis, which comprises a main rod and a sample pressing disc, and the sample pressing disc is connected to one end of the main rod; a concave part with fixed depth is arranged at the bottom of the sample pressing disc; a notch is formed in the side edge of the bottom. Compared with the prior art, the optical path is fixed through the concave part at the bottom of the sample pressing disc on the main rod, so that the result reproducibility is improved, and the accuracy of a test result is improved; meanwhile, the notch formed in the side edge facilitates discharge of redundant samples, bubbles are easily generated in the liquid sample transfer process, the arrangement of the notch facilitates discharge of the bubbles, and the accuracy of the measurement result can be further improved.

Description

Technical Field

[0001] The invention relates to a sample press, in particular to a sample press used for near-infrared volatile liquid analysis. Background Art

[0002] An infrared spectrometer analyzes molecular structure and chemical composition by utilizing a substance's absorption characteristics for infrared radiation of varying wavelengths. When a sample absorbs infrared radiation of a certain frequency, the molecular vibrational energy levels transition, weakening the corresponding frequency in the transmitted beam. This creates an intensity difference between the reference and sample light paths, resulting in the infrared spectrum of the sample. Traditional sample cups used for near-infrared spectroscopy often lack a sample press; instead, the sample is placed directly into the cup, and the spectrum is collected via transmission or reflection.

[0003] Chinese patent document CN213791734U discloses a storage device for a sampling cup and sample press for a near-infrared spectrometer, comprising a storage box and a flexible sampling cup positioning sleeve. The storage box comprises a main body, the main body being provided with a sampling cup storage area and a sample press storage area. The sampling cup storage area is provided with a positioning groove for the flexible sampling cup positioning sleeve, and the sample press storage area is provided with a positioning groove for the sample press. The flexible sampling cup positioning sleeve is provided with a sampling cup positioning groove, and the flexible sampling cup positioning sleeve cooperates with the positioning groove of the flexible sampling cup positioning sleeve to secure the flexible sampling cup positioning sleeve within the positioning groove of the flexible sampling cup positioning sleeve. The storage device for a sampling cup and sample press for a near-infrared spectrometer disclosed in the present invention can securely and reliably secure the sampling cup and sample press, effectively preventing the sampling cup and sample press from rolling during placement and removal. Furthermore, securing the sampling cup within the positioning groove of the flexible sampling cup positioning sleeve prevents wear on the translucent surface of the sampling cup. In this prior art, although the sample presses can be stored by the storage device, there is a problem of poor reproducibility of results. Summary of the Invention

[0004] In order to solve the technical problem of poor result reproducibility in the sampling cup in the prior art, the present invention provides a sample press for near-infrared volatile liquid analysis, comprising a main rod and a sample pressing disc, which is connected to one end of the main rod; a recessed portion of a fixed depth is provided at the bottom of the sample pressing disc and a notch is opened on the side of the bottom.

[0005] Because the optical path of existing open sample cups is difficult to control, which is also the reason for the poor reproducibility of results, in this solution, a sample pressing disc is set at one end of the main rod, and a recessed portion of a fixed depth is set at the bottom of the sample pressing disc. The recessed portion of the fixed depth fixes the measurement optical path, so the measurement results are more reproducible. Compared with the existing technology, in this solution, the optical path is fixed by the recessed portion at the bottom of the sample pressing disc on the main rod to improve the reproducibility of the results, thereby improving the accuracy of the test results. At the same time, the notch set on the side facilitates the discharge of excess sample. Since liquid samples are prone to bubbles during the transfer process, the setting of the notch also facilitates the discharge of bubbles, which can further improve the accuracy of the measurement results.

[0006] Preferably, the bottom side of the sample pressing disc is evenly spaced along the circumference thereof. In this solution, the evenly spaced notches at the bottom of the sample pressing disc can ensure that excess sample and air bubbles are discharged in a timely manner.

[0007] Preferably, a movable stopper is provided on the main rod. Considering that the sample press is usually used in conjunction with a sample cup, in this solution, the provision of the movable stopper can seal the sample cup, thereby reducing the impact of sample volatilization on the measurement results.

[0008] Preferably, the movable stopper can slide along the axial direction of the main rod. In this solution, the movable stopper can be slidable to facilitate the addition of samples.

[0009] Preferably, the movable plug is provided with a connection hole matching the main rod, and the movable plug is sleeved on the main rod through the connection hole. In this solution, the connection hole is provided to facilitate the connection of the movable plug on the main rod, and the sliding of the movable plug on the main rod is achieved, with a simple structure.

[0010] Preferably, the movable stopper is an elastic movable stopper. In this embodiment, after selecting the movable stopper made of elastic material, since the movable stopper is in direct contact with the upper end of the sample cup, the elasticity of the movable stopper provides a certain buffering effect, thereby preventing the sample cup from being broken due to excessive external force, thereby reducing the chance of damage to the sample cup.

[0011] Preferably, the other end of the main rod is detachably provided with a fixing piece. In this solution, the setting of the fixing piece can prevent the movable plug from sliding off the main rod, and the structure is simple.

[0012] Preferably, the main rod is a stainless steel main rod. In this solution, the main rod made of stainless steel can increase the service life of the main rod.

[0013] The present invention has the following beneficial effects: 1. In the present invention, the fixed depth of the depression at the bottom of the sample pressing disk fixes the measurement optical path, and the measurement results are more reproducible; the sampling amount is small, and the sample only needs to fill the depression at the bottom of the sample pressing disk.

[0014] 2. The notch on the side of the sample pressing disc facilitates the discharge of excess sample and can squeeze out bubbles, thereby improving the accuracy of the measurement; 3. The sample pressing disc at the bottom of the main rod has been covered with a large amount of test samples, and is equipped with a movable plug on the top, which reduces the impact of sample volatilization on the test results; 4. The movable stopper is in direct contact with the top of the glass sample cup. Its material has a certain buffering effect to prevent the sample cup from breaking due to excessive external force; 5. The movable plug is not fixed to the main rod, but can slide up and down flexibly, making it more convenient to add samples.

[0015] 6. After the measurement, high viscosity samples tend to stick to the sample press. The sample press can be cleaned more easily by loosening the upper fixings and removing the movable plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of an embodiment of a sample press for near-infrared volatile liquid analysis according to the present invention. DETAILED DESCRIPTION

[0017] The following is further described in detail through specific implementation methods: 1. Definition Near-infrared light: It is an electromagnetic wave between visible light (S) and mid-infrared light (MIR). According to the definition of ASTM (American Society for Testing and Materials), it refers to electromagnetic waves with a wavelength range of 780 to 2526 nm. It is customary to divide the near-infrared region into two regions: near-infrared short wave (780 to 1100 nm) and near-infrared long wave (1100 to 2526 nm).

[0018] 2. The reference numerals in the drawings of the specification include: sample cup 1, main rod 2, movable stopper 3, fixing part 4.

[0019] The embodiment is basically as shown in the attached Figure 1 The figure shows a sample press for near-infrared volatile liquid analysis. The sample press comprises a main rod 2 and a sample pressing disc connected to one end of the main rod 2. The disc has a depression of a fixed depth at its bottom. Four notches are evenly spaced along the circumference of the disc's bottom edge.

[0020] The main rod 2 is provided with a movable plug 3, which can slide axially along the main rod 2. Specifically, the center of the movable plug 3 is provided with a connection hole that matches the main rod 2, and the movable plug 3 is sleeved on the main rod 2 through the connection hole. The upper part of the main rod 2 is also detachably provided with a fixing member 4, which is a nut. The movable plug 3 is a rubber plug, and the main rod 2 is a stainless steel main rod 2.

[0021] The specific implementation process is as follows: During use, the sampler is used in conjunction with a sample cup 1. The movable stopper 3 is slid upward to expose the opening of the sample cup 1. The transferred sample is then added to the sample cup 1 through the opening. Addition of sample is stopped when the sample fills the depression at the bottom of the sample pressing disc. The movable stopper 3 is then slid downward to reseal the opening of the sample cup 1.

[0022] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A sample press for near-infrared volatile liquid analysis, characterized by: The sample pressing disc comprises a main rod and a sample pressing disc, wherein the sample pressing disc is connected to one end of the main rod; a concave portion with a fixed depth is provided at the bottom of the sample pressing disc and a notch is provided at the side of the bottom.

2. The sample press for near-infrared volatile liquid analysis according to claim 1, characterized in that: The notches are evenly spaced along the circumference of the bottom side of the sample pressing disc.

3. The sample press for near-infrared volatile liquid analysis according to claim 1 or 2, characterized in that: A movable plug is provided on the main rod.

4. The sample press for near-infrared volatile liquid analysis according to claim 3, characterized in that: The movable plug can slide axially along the main rod.

5. The sample press for near-infrared volatile liquid analysis according to claim 4, characterized in that: The movable plug is provided with a connecting hole which matches the main rod, and the movable plug is sleeved on the main rod through the connecting hole.

6. The sample press for near-infrared volatile liquid analysis according to claim 5, characterized in that: The movable plug is an elastic movable plug.

7. The sample press for near-infrared volatile liquid analysis according to claim 6, characterized in that: The other end of the main rod is detachably provided with a fixing piece.

8. The sample press for near-infrared volatile liquid analysis according to claim 7, characterized in that: The main rod is a stainless steel main rod.

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