Sample introduction mechanism of ultraviolet and visible spectrophotometer

Abstract

The utility model provides an ultraviolet and visible spectrophotometer sample introduction mechanism, which comprises an absorption cell, the absorption cell comprises a row of tube placing frames arranged along the longitudinal direction, and two transverse side walls of each tube placing frame are provided with channels for light to pass through. Each tube placing frame comprises an outer-layer frame and an inner-layer frame arranged in the outer-layer frame in a sleeving manner, each inner-layer frame comprises a square end plate and four right-angle side edges, the bottom ends of the four right-angle side edges are connected with the four corners of the square end plate, and a sample tube clamping space is defined by the middles of the four right-angle side edges; and a square slot matched with the square end plate and the four right-angle edges is formed in the center of the outer-layer frame, so that the inner-layer frame can be conveniently inserted and pulled. The sample introduction mechanism of the ultraviolet and visible spectrophotometer has the advantages of being scientific in design, capable of avoiding grabbing a smooth surface by mistake, not prone to being installed in a reverse direction and convenient to operate.

Description

Technical Field

[0001] The utility model relates to an ultraviolet-visible spectrophotometer, in particular to a sample feeding mechanism of the ultraviolet-visible spectrophotometer. Background Art

[0002] A UV-visible spectrophotometer is an analytical instrument based on the principle of UV-visible spectrophotometry, utilizing the absorption of radiation by molecules in the UV-visible spectral region. A light source emits continuous radiation, which is dispersed into monochromatic light by a monochromator according to wavelength. This monochromatic light then shines onto an absorption cell, where a portion is absorbed by the sample solution. The unabsorbed light is detected by a detector, which measures the absorbance of the sample solution.

[0003] When the UV-visible spectrophotometer is in use, the sample solution is contained in a sample tube. One set of opposite side walls of the sample tube is smooth, and the other set of opposite side walls is rough. When the sample tube is placed in the absorption cell, the smooth side needs to face the light path. However, in actual operation, on the one hand, when the staff grasps the sample tube, they may easily grab the smooth surface of the sample tube due to carelessness, and the smooth surface needs to be cleaned again before accurate measurement can be performed; on the other hand, it is also easy to reverse the smooth surface and the rough surface when placing it in the sample cell, which affects the passage of light and needs to be readjusted, affecting measurement efficiency.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0005] The utility model aims to address the deficiencies of the prior art and thus provide a UV-visible spectrophotometer sample introduction mechanism which has a scientific design, can avoid mistakenly grasping the smooth surface, is not easy to be installed in the reverse direction, and is easy to operate.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a sample injection mechanism of an ultraviolet-visible spectrophotometer, including an absorption cell, the absorption cell including a tube rack arranged along the longitudinal direction, and each tube rack having two lateral side walls provided with a channel for light to pass through, each tube rack including an outer frame and an inner frame sleeved in the outer frame, the inner frame including a square end plate and four right-angled edges, the bottom ends of the four right-angled edges being connected to the four corners of the square end plate, and the middle of the four right-angled edges forming a sample tube clamping space; a square slot is provided in the center of the outer frame, which cooperates with the square end plate and the four right-angled edges to facilitate the insertion and removal of the inner frame.

[0007] Based on the above, the inner frame also includes a square enclosure, the inner corners of which are connected to the upper outer walls of the four right-angled edges. When the inner frame is inserted to the bottom of the square slot, the bottom surface of the square enclosure is pressed on the top surface of the outer frame.

[0008] Based on the above, a positioning notch is provided at the outer corner of at least one of the right-angled edges, and a positioning protrusion is provided at the corner of the groove wall of the square slot corresponding to the positioning notch. The positioning notch and the positioning protrusion constitute a positioning mechanism for controlling the direction of tube placement.

[0009] Based on the above, the inner frame is provided with two positioning notches, and the two positioning notches are symmetrically arranged on the two oppositely arranged right-angled edges.

[0010] Based on the above, the absorption tank is provided with four tube racks in total.

[0011] The present invention has substantial features and progress compared to the prior art. Specifically, the present invention divides the traditional tube rack into two layers, an inner layer and an outer layer. The inner layer frame can be taken out from the outer layer frame. When in use, the inner layer frame is permanently placed on the outside of the sample tube and can be inserted into the square slot of the outer layer frame together with the sample tube. In this way, the four right-angled edges and the square enclosure are blocked on the outside, which can greatly reduce the probability of human hands accidentally touching the smooth surface of the sample tube.

[0012] Furthermore, the positioning notch and the positioning protrusion constitute a positioning mechanism for controlling the direction of tube placement, which can ensure that the light side of the sample tube faces the light path; the two positioning notches are symmetrically arranged, so that when the sample tube is rotated 180°, it can also be placed in the square slot, thereby making operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a top view of the sample injection mechanism of the ultraviolet-visible spectrophotometer.

[0014] Figure 2 It is a side structural diagram of the inner frame of the utility model.

[0015] Figure 3 It is a top view of the inner frame of the utility model.

[0016] Figure 4 It is a top view of the outer frame of the utility model.

[0017] In the figure: 1. Outer frame; 2. Inner frame; 11. Square slot; 12. Positioning protrusion; 21. Square end plate; 22. Right-angle edge; 23. Square enclosure; 24. Positioning notch. DETAILED DESCRIPTION

[0018] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0019] like Figure 1-4 As shown, a sample injection mechanism of an ultraviolet-visible spectrophotometer includes an absorption cell, which includes four tube racks arranged along the longitudinal direction. Each tube rack has a channel for light to pass through on its two lateral walls. This part belongs to the existing structure of ultraviolet-visible spectrophotometers on the market and does not require creative work.

[0020] To prevent people from accidentally touching the smooth surface of the sample tube, the tube rack is divided into two layers, an outer frame 1 and an inner frame 2 sleeved in the outer frame 1, the inner frame 2 includes a square end plate 21, four right-angled edges 22 and a square enclosure 23, the bottom ends of the four right-angled edges 22 are connected to the four corners of the square end plate 21, and the middle of the four right-angled edges 22 forms a sample tube clamping space for clamping the sample tube; a square slot 11 is opened in the center of the outer frame 1 to cooperate with the square end plate 21 and the four right-angled edges 22 to facilitate the insertion and removal of the inner frame 2; the inner corner of the square enclosure 23 is connected to the upper part of the outer wall of the four right-angled edges 22, and when the inner frame 2 is inserted to the bottom of the square slot 11, the bottom surface of the square enclosure 23 presses on the top surface of the outer frame 1, which fixes the upper and middle parts of the four right-angled edges 22 and facilitates gripping.

[0021] During specific use, the inner frame 2 is first taken out from the outer frame 1, and the inner frame 2 is put on the outside of the sample tube. After pouring the sample, the staff grasps the square enclosure 23 and inserts the inner frame 2 together with the sample tube into the square slot 11 of the outer frame 1. During the operation, the four right-angle edges 22 and the square enclosure 23 are blocked on the outside, which greatly reduces the probability of human hands accidentally touching the smooth surface of the sample tube.

[0022] In order to ensure that the light surface of the sample tube is aligned with the light path, a positioning notch 24 is provided at the outer corner of at least one of the right-angled edges 22, and a positioning protrusion 12 is provided at the corner of the groove wall of the square slot 11 corresponding to the positioning notch 24. The positioning notch 24 and the positioning protrusion 12 constitute a positioning mechanism for controlling the direction of tube placement; specifically, the inner frame 2 is provided with two positioning notches 24, and the two positioning notches 24 are symmetrically arranged on the two oppositely arranged right-angled edges 22. In this way, even if the sample tube is rotated 180°, it can still be placed in the square slot 11, making operation more convenient.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A sample introduction mechanism for an ultraviolet-visible spectrophotometer, comprising an absorption cell, wherein the absorption cell comprises a tube rack arranged longitudinally, each tube rack having two lateral walls formed with channels for light to pass through, characterized in that: Each tube rack includes an outer frame and an inner frame sleeved in the outer frame. The inner frame includes a square end plate and four right-angled edges. The bottom ends of the four right-angled edges are connected to the four corners of the square end plate, and the middle of the four right-angled edges forms a sample tube clamping space. A square slot is provided in the center of the outer frame to cooperate with the square end plate and the four right-angled edges to facilitate the insertion and removal of the inner frame.

2. The UV-visible spectrophotometer sample injection mechanism according to claim 1, characterized in that: The inner frame also includes a square enclosure, the inner corners of which are connected to the upper portions of the outer walls of the four right-angled edges. When the inner frame is inserted into the bottom of the square slot, the bottom surface of the square enclosure is pressed against the top surface of the outer frame.

3. The UV-visible spectrophotometer sample injection mechanism according to claim 1 or 2, characterized in that: A positioning notch is provided at the outer corner of at least one of the right-angled edges, and a positioning protrusion is provided at the corner of the groove wall of the square slot corresponding to the positioning notch. The positioning notch and the positioning protrusion constitute a positioning mechanism for controlling the direction of tube placement.

4. The UV-visible spectrophotometer sample injection mechanism according to claim 3, characterized in that: The inner frame is provided with two positioning notches in total, and the two positioning notches are symmetrically arranged on two oppositely arranged right-angled edges.

5. The UV-visible spectrophotometer sample injection mechanism according to any one of claims 1, 2 and 4, characterized in that: The absorption tank is provided with four tube racks in total.

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