CN108562552B

CN108562552B - High-precision spectrophotometer

Info

Publication number: CN108562552B
Application number: CN201810553612.1A
Authority: CN
Inventors: 缪双双; 杨丽; 陈亚楠; 任思佳; 刘毓; 胡青青
Original assignee: Taizhou Taihuan Environmental Detection Technology Co ltd
Current assignee: Taizhou Taihuan Environmental Detection Technology Co ltd
Priority date: 2018-05-31
Filing date: 2018-05-31
Publication date: 2020-12-15
Anticipated expiration: 2038-05-31
Also published as: CN108562552A

Abstract

The invention discloses a high-precision spectrophotometer, which relates to the field of chemical analysis, and adopts the technical scheme that: including the casing, set up light source, color comparison frame, the detector in the casing, be provided with the baffle with color comparison frame and light source spaced in the casing, set up the logical unthreaded hole that supplies the light path to pass on the baffle, it slides and is provided with the balladeur train to lie in one side that the baffle deviates from the color comparison frame in the casing, be provided with a plurality of monochromatic mirrors on the balladeur train, the monochromatic mirror can be followed the balladeur train and slided and will lead to the unthreaded hole and seal. According to the spectrophotometer, by arranging the sliding frame and the plurality of the monochromatic mirrors, the wetted monochromatic mirrors can be conveniently switched, and the influence on the detection precision is reduced; on the premise that the monochromatic mirror can be reliably abutted against the light through hole, the monochromatic mirror is not easy to wear in the switching process, and a sample is not easy to spill into the shell or the outer wall of the cuvette; the spectrophotometer can be used for measuring the content of ammonia nitrogen in water.

Description

High-precision spectrophotometer

Technical Field

The invention relates to the field of chemical analysis, in particular to a high-precision spectrophotometer.

Background

The principle of the visible spectrophotometer is as follows: the ultraviolet-visible absorption spectrum of a molecule is an absorption spectrum generated by electronic energy level transition after some groups in the molecule absorb ultraviolet-visible radiation. Because each substance has different molecules, atoms and different molecular space structures, the situation of absorbing light energy is different, so that each substance has a specific and fixed absorption spectrum curve, and the content of the substance can be distinguished or determined according to the absorbance at certain characteristic wavelengths on the absorption spectrum, which is the basis of spectrophotometric qualitative and quantitative analysis.

The present chinese utility model patent with the publication number CN201689045U discloses a portable ultraviolet-visible spectrophotometer, which comprises a housing, a light source, a reflector, an instrument board, a rechargeable lithium battery, a colorimetric stand, a monochromator and a PDA detector, wherein the reflector and the monochromator are respectively arranged at two sides of the colorimetric stand, the PDA detector is arranged at the exit direction of the monochromator, and the xenon light source is arranged at the entrance direction of the reflector. The colorimetric stand is used for placing a cuvette containing a sample to be tested, and the PDA detector detects photometric signals passing through the sample and feeds back the photometric signals to the processor to form a map for personnel to analyze.

Be provided with transparent monochromatic mirror on the monochromator, because the sample in the work intracavity is generally the aqueous solution, if the sample is placed in the photometer for a long time, or moisture spills the cell, then there is the problem that wets easily in the monochromatic mirror, and the monochromatic mirror after the wetting can influence the detection precision of photometer.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a high-precision spectrophotometer, which can be used for conveniently replacing a wetted monochromatic mirror and reducing the influence on the detection precision.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a high accuracy spectrophotometer, includes the casing, sets up light source, color comparison frame, detector in the casing, be provided with the baffle with color comparison frame and light source spaced in the casing, set up the logical unthreaded hole that supplies the light path to pass on the baffle, it slides and is provided with the balladeur train to lie in one side that the baffle deviates from the color comparison frame in the casing, be provided with a plurality of monochromatic mirrors on the balladeur train, the monochromatic mirror can slide along the balladeur train and will lead to the unthreaded hole and seal.

Through above-mentioned technical scheme, during the detection, place the sample on the color comparison frame, the light that the light source sent reaches detector department after passing monochromatic mirror, logical unthreaded hole, sample in proper order to detect the composition of sample. Before each detection, the slide frame can be slid to switch the monochromatic mirror right opposite to the light hole, so that the damp monochromatic mirror can be conveniently replaced; because the baffle, be located the monochromatic mirror of light aperture department and separate sample and balladeur train place chamber, then idle monochromatic mirror is difficult for weing on the balladeur train, ensures that the monochromatic mirror state after the switching is good, is difficult for influencing during the detection precision.

Preferably, a sliding rail for sliding the sliding frame is arranged in the shell, a gap is reserved between the sliding rail and the partition plate, and the sliding frame is bent at the through hole to the through hole.

Through above-mentioned technical scheme, at the in-process of switching the monochromatic mirror, the orbit of monochromatic mirror has been controlled to the slide rail that the bending set up, then the monochromatic mirror can reliably support tightly under the prerequisite of logical unthreaded hole, and the monochromatic mirror is difficult to produce the friction and then wearing and tearing with the baffle, has prolonged the life of monochromatic mirror.

Preferably, two sliding rails are arranged along the vertical direction, and the sliding frame comprises two flexible frames which are respectively connected with the two sliding rails in a sliding manner and a connecting rod which connects the two flexible frames; the monochromatic mirror is hinged with the flexible frame, and the hinged shaft of the monochromatic mirror is located on the central line of the monochromatic mirror along the vertical direction.

Through above-mentioned technical scheme, the structural strength of balladeur train and monochromatic mirror is higher and slide steadily reliably, and the monochromatic mirror can produce the self-adaptation when compressing tightly logical unthreaded hole and rotate, ensures reliably to offset.

Preferably, a first magnetic ring is arranged on the monochromatic mirror along the circumferential direction, a second magnetic ring is arranged on an orifice of the light through hole along the circumferential direction, and the magnetic forces of the first magnetic ring and the second magnetic ring attract each other.

According to the technical scheme, when the dichroic mirror moves to the through light hole, the attractive force of the first magnetic ring and the second magnetic ring acts on the dichroic mirror, so that the dichroic mirror is reliably abutted against the through light hole; and personnel can judge whether the monochromatic mirror is installed in place through the change of feeling when sliding the carriage, and is comparatively convenient.

Preferably, a sealing ring is arranged on the end surface of the first magnetic ring facing the second magnetic ring.

Through above-mentioned technical scheme, the sealing ring has improved both sealed effects, and the air is difficult for circulating in baffle both sides through the unthreaded hole to reduce moisture intercommunication.

Preferably, the mounting groove has been seted up on the color comparison frame, the cell has been placed in the mounting groove, the color comparison frame slides and sets up on the casing, the color comparison frame can make the cell be located outside the casing through sliding, the position of color comparison frame roll-off casing is the feed inlet.

Through above-mentioned technical scheme, the color comparison frame can make the color comparison ware be located outside the casing through sliding, then relevant personnel can conveniently get and put the color comparison ware.

Preferably, the feed inlet is located at a side wall of the housing.

Through above-mentioned technical scheme, after the frame part roll-off casing, the cell is located outside the casing, and does not have other parts of this photometer below the cell, then when contrast cell gets to put, pours into the sample, unexpected spill the sample can not get into in the casing, prevent to cause the pollution to the internal environment of casing.

Preferably, a baffle is arranged on the shell above the feeding hole, an injection hole is formed in the baffle, and when the color comparison rack slides out of the feeding hole, the injection hole can be aligned with the top of the color comparison dish.

Through above-mentioned technical scheme, the accessible injection hole pours the sample into to the cell into the in-process of pouring the sample into, if the sample spills carelessly outward, spills the sample can be located the baffle, and on being difficult for flowing to the lateral wall of cell, sets up like this, can avoid wiping the step of cell outer wall after pouring the sample into, improves detection efficiency.

Preferably, be provided with on the casing with feed inlet confined feed door, be provided with the gliding atmospheric pressure pole of drive color comparison frame in the casing, the elasticity direction of atmospheric pressure pole is for ordering about the direction that the color comparison frame stretches out the feed inlet.

Through the technical scheme, when the feeding door is opened, the color comparison frame slowly extends out of the feeding hole under the elastic action of the air pressure rod; when the colorimetric stand needs to be installed back, a person pushes the colorimetric stand by hand, the colorimetric stand overcomes the resistance of the air pressure rod and retracts into the shell, and meanwhile, the feeding door is closed; so realized the auto-eject of color comparison frame, and the difficult spill of sample in the cell.

In summary, compared with the prior art, the beneficial effects of the invention are as follows:

1. by arranging the sliding frame and the plurality of the monochromatic mirrors, the wetted monochromatic mirrors can be conveniently switched, and the influence on the detection precision is reduced;

2. on the premise that the monochromatic mirror can be reliably abutted against the light through hole, the monochromatic mirror is not easy to wear in the switching process;

3. the colorimetric stand can slide to the outside of the shell, so that the probability of the sample being scattered into the shell is reduced;

4. through setting up baffle and filling hole, reduced the probability that the sample spilled the cell outer wall.

Drawings

FIG. 1 is a perspective view of a high-precision spectrophotometer according to an embodiment, mainly highlighting the external structure of the spectrophotometer;

FIG. 2 is a partial view of the spectrophotometer, which mainly highlights the internal structure of the spectrophotometer;

FIG. 3 is a partial exploded view of the spectrophotometer, showing primarily the configuration of the carriage and clear aperture;

fig. 4 is a schematic structural view of a carriage and a dichroic mirror in the embodiment;

FIG. 5 is a view showing the construction of the spectrophotometer with the cuvette holder in a slide-out state;

fig. 6 is a cross-sectional view a-a of fig. 5, mainly highlighting the structure of the injection hole and cuvette.

Reference numerals: 1. a housing; 11. a light source; 2. a carriage; 3. a colorimetric stand; 12. a detector; 13. a partition plate; 4. a monochromatic mirror; 131. a light through hole; 31. a cuvette; 14. a cover plate; 15. a slide rail; 21. a flexible frame; 22. a connecting rod; 41. a first magnetic ring; 42. a seal ring; 132. a second magnetic ring; 32. mounting grooves; 16. a feed inlet; 161. a feed gate; 5. a pneumatic rod; 6. a baffle plate; 61. and (4) injecting a hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

A high-precision spectrophotometer, as shown in figure 1, comprises a housing 1, a switchable cover plate 14 is arranged on the top of the housing 1. As shown in fig. 2 and 3, a light source 11, a carriage 2, a color comparison rack 3 and a detector 12 are arranged in the housing 1, a partition 13 is further arranged in the housing 1, wherein the light source 11 and the carriage 2 are positioned on one side of the partition 13, and the color comparison rack 3 and the detector 12 are positioned on the other side of the partition 13. The carriage 2 is provided with a plurality of monochromatic mirrors 4, the partition plate 13 is provided with light through holes 131, the cuvette 31 for placing the sample is arranged on the cuvette holder 3, and the light emitted by the light source 11 sequentially passes through the monochromatic mirrors 4, the light through holes 131 and the cuvette 31 and then reaches the detector 12, so that the sample in the cuvette 31 is measured.

Two slide rails 15 for the sliding of the sliding frame 2 are fixed in the shell 1, the connecting line direction of the two slide rails 15 is along the vertical direction, and the vertical distance between the two slide rails 15 is equal at all positions; the slide rail 15 is parallel to the partition plate 13, and a gap is left between the slide rail 15 and the partition plate 13, and the slide rail 15 is located at the light through hole 131 and bends and protrudes towards the light through hole 131.

As shown in fig. 3 and 4, the carriage 2 includes two flexible frames 21 slidably disposed in the two slide rails 15, respectively, and a plurality of connecting rods 22 connecting the two flexible frames 21. The flexible frame 21 in this embodiment is an articulated chain made of plastic, and the flexible frame 21 can twist but cannot stretch along the axis; the connecting rods 22 are fixed to the flexible frame 21 through both ends, and a plurality of the connecting rods 22 are spaced apart along the length direction of the flexible frame 21, thereby combining the carriage 2 into a single body. The length of the carriage 2 is long and the carriage 2 passes out of the housing 1 from the side wall of the housing 1. The monochromatic mirror 4 is rectangular, the monochromatic mirror 4 is composed of a transparent mirror body and a protective sleeve covering the periphery, the monochromatic mirror 4 is hinged to the flexible frame 21 through two opposite side walls, and a hinged shaft of the monochromatic mirror 4 is located on the central line of the monochromatic mirror 4 in the vertical direction. A first magnetic ring 41 is fixed on the end face of the dichroic mirror 4 facing the partition plate 13, the first magnetic ring 41 is made of magnets and is located at the circumferential edge of the dichroic mirror 4, and a sealing ring 42 made of rubber is fixed on the end face of the first magnetic ring 41 in an adhering mode.

The second magnetic ring 132 is circumferentially arranged at the opening of the light through hole 131, and the magnetic forces of the first magnetic ring 41 and the second magnetic ring 132 attract each other. When a person pulls or pushes the carriage 2 outside the housing 1, the carriage 2 moves along the slide rail 15, and the dichroic mirror 4 approaches the light through hole 131 along the curved slide rail 15; when the dichroic mirror 4 slides to the nearest part of the slide rail 15 near the partition plate 13, the dichroic mirror 4 is just abutted against the aperture of the light passing hole 131. The attractive force of the first magnetic ring 41 and the second magnetic ring 132 acts on the dichroic mirror 4, so that the dichroic mirror 4 is reliably abutted against the light through hole 131, the sealing ring 42 improves the sealing effect of the two, and air is not easy to circulate on two sides of the partition plate 13 through the light through hole 131. Personnel can judge whether installation of monochromatic mirror 4 is in place through the change of feeling, also can open apron 14 and observe whether installation of monochromatic mirror 4 is in place.

As shown in fig. 5 and 6, the cuvette 31 is a rectangular parallelepiped transparent container, and the cuvette holder 3 is provided with an installation groove 32 for placing the cuvette 31. The feed inlet 16 is formed in the shell 1, the feed inlet 16 is located on the same side wall of the sliding frame 2 penetrating out of the shell 1, the feed inlet 16 is hinged to a feed door 161, and the feed door 161 can rotate around the hinged position, so that the two states of opening the feed inlet 16 and closing the feed inlet 16 are switched. The color comparison rack 3 is arranged on the shell 1 in a sliding mode through a sliding chute and a sliding block, the sliding direction of the color comparison rack 3 is the horizontal direction, and the color comparison rack can partially slide out of the shell 1 through the feeding hole 16; after the cuvette holder 3 is partly slid out of the housing 1, the cuvette 31 is located outside the housing 1.

The colorimetric stand 3 is driven to slide by a pneumatic rod 5 arranged in the shell 1, one end of the pneumatic rod 5 is fixed on the shell 1, the other end of the pneumatic rod 5 is fixed on the colorimetric stand 3, and the length direction of the pneumatic rod 5 is consistent with the sliding direction of the colorimetric stand 3; the pneumatic rod 5 is preset with elasticity, and the elasticity direction of the pneumatic rod 5 is the extending direction thereof. The air pressure rod 5 is provided with certain damping, so that the air pressure rod 5 can stretch and retract slowly; the pneumatic rod 5 is prior art and will not be described in detail herein. When the feeding door 161 is opened, the colorimetric stand 3 slowly extends out of the feeding hole 16 under the elastic force of the air pressure rod 5; when the color comparison rack 3 needs to be installed back, a person pushes the color comparison rack 3 with a hand, the color comparison rack 3 overcomes the resistance of the air pressure rod 5 and retracts into the shell 1, and meanwhile, the feeding door 161 is closed. After the feed door 161 is closed, the feed door 161 is spacing with the color comparison frame 3, and the cell 31 is just in time located the light path that the light source 11 shines, has so realized popping out automatically of color comparison frame 3, and the difficult spill of the sample in the cell 31.

The position of the outer side of the shell 1, which is close to the upper edge of the feed port 16, is hinged with a baffle 6, an articulated shaft of the baffle 6 is arranged at the edge of the top surface of the baffle 6 along the horizontal direction, and the baffle 6 can rotate around the articulated shaft, thereby switching the horizontal state and the vertical state. The plate surface of the baffle 6 is perforated with an injection hole 61, and the diameter of the injection hole 61 is smaller than the inner diameter of the cuvette 31. When the colorimetric stand 3 slides out of the feed port 16 to be limited and the baffle 6 is in a vertical state, personnel can conveniently take and place the cuvette 31; when the shutter 6 is in the horizontal state, the injection hole 61 is aligned with the top of the cuvette 31 and they are abutted against each other, and the sample can be poured into the cuvette 31 through the injection hole 61. In the process of pouring the sample, if the sample is carelessly spilled, the spilled sample cannot enter the shell 1, and the environment in the shell 1 cannot be polluted; and the spilled sample can be positioned on the baffle 6 and is not easy to flow to the outer side wall of the cuvette 31, so that the step of wiping the outer wall of the cuvette 31 can be omitted after the sample is poured, and the detection efficiency is improved.

This spectrophotometer can conveniently switch through balladeur train 2 just to the monochromatic mirror 4 of light trap before detecting, then can conveniently change the monochromatic mirror 4 that wets. Because baffle 13, the monochromatic mirror 4 that is located light-transmitting hole department separate cell 31 and balladeur train 2 place chamber, then the idle monochromatic mirror 4 on the balladeur train 2 is difficult for weing, ensures that the monochromatic mirror 4 after the switching is in good condition, is difficult for influencing during the detection precision.

At the in-process of switching monochromatic mirror 4, the orbit of monochromatic mirror 4 has been controlled to the slide rail 15 of crooked setting, then monochromatic mirror 4 can reliably support tightly under the prerequisite of logical unthreaded hole 131, and monochromatic mirror 4 is difficult for producing the friction and then wearing and tearing with baffle 13, has prolonged the life of monochromatic mirror 4. The used monochromatic mirror 4 can be taken out together with the sliding frame 2, so that the moistened monochromatic mirror 4 is intensively treated, and the moistened dichroic mirror is cleaned and then packaged.

The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.

Claims

1. The utility model provides a high accuracy spectrophotometer, includes casing (1), sets up light source (11), color comparison frame (3), detector (12) in casing (1), characterized by: a partition plate (13) for separating the colorimetric stand (3) from the light source (11) is arranged in the shell (1), a light through hole (131) for a light path to pass through is formed in the partition plate (13), a sliding frame (2) is arranged in the shell (1) and is located on one side, away from the colorimetric stand (3), of the partition plate (13) in a sliding mode, a plurality of monochromatic mirrors (4) are arranged on the sliding frame (2), a sliding rail (15) for the sliding frame (2) to slide is arranged in the shell (1), and the monochromatic mirrors (4) can slide along the sliding rail (15) and seal the light through hole (131);

a gap is reserved between the sliding rail (15) and the partition plate (13), and the sliding rail (15) is bent towards the light through hole (131) at the light through hole (131); when the monochromatic mirror (4) slides to the nearest part of the slide rail (15) close to the partition plate (13), the monochromatic mirror (4) is just abutted against the aperture of the light through hole (131);

two sliding rails (15) are arranged along the vertical direction, and the sliding frame (2) comprises two flexible frames (21) which are respectively connected with the two sliding rails (15) in a sliding manner and a connecting rod (22) which connects the two flexible frames (21); the monochromatic mirror (4) is hinged with the flexible frame (21), and a hinged shaft of the monochromatic mirror (4) is positioned on a central line of the monochromatic mirror (4) along the vertical direction; a first magnetic ring (41) is arranged on the monochromatic mirror (4) along the circumferential direction, a second magnetic ring (132) is arranged on the opening of the light through hole (131) along the circumferential direction, and the magnetic forces of the first magnetic ring (41) and the second magnetic ring (132) attract each other.

2. A high precision spectrophotometer according to claim 1 wherein: and a sealing ring (42) is arranged on the end surface of the first magnetic ring (41) facing the second magnetic ring (132).

3. A high precision spectrophotometer according to claim 1 wherein: seted up mounting groove (32) on color comparison frame (3), placed cell (31) in mounting groove (32), color comparison frame (3) slide and set up on casing (1), outside color comparison frame (3) can make cell (31) be located casing (1) through sliding, the position of color comparison frame (3) roll-off casing (1) is feed inlet (16).

4. A high precision spectrophotometer according to claim 3 wherein: the feed opening (16) is located in the side wall of the shell (1).

5. The high accuracy spectrophotometer of claim 4, wherein: be provided with baffle (6) on casing (1) of feed inlet (16) top, injection hole (61) have been seted up on baffle (6), work as when color comparison frame (3) roll-off feed inlet (16), the top of contrast color dish (31) can be just contrasted in injection hole (61).

6. The high accuracy spectrophotometer of claim 4, wherein: be provided with on casing (1) with feed inlet (16) confined feed gate (161), be provided with gliding atmospheric pressure pole (5) of drive color comparison frame (3) in casing (1), the elasticity direction of atmospheric pressure pole (5) is for driving about the direction that color comparison frame (3) stretched out feed inlet (16).