Sample introduction device of ultraviolet spectrophotometer for food detection

Abstract

The utility model discloses a food detection ultraviolet spectrophotometer's sample introduction device, including base and cuvette, the upper surface of base is equipped with fixed link and fixed plate, the upper end of fixed link is equipped with sample introduction subassembly, the sample introduction subassembly includes mounting plate and be equipped with a plurality of fixed cylinder on the lower surface of mounting plate, and the fixed cylinder is equipped with the fixed plate. A guide rod and a first screw rod are arranged at the two ends of the mounting plate correspondingly, the lower end of the first screw rod penetrates through the mounting plate and is rotationally connected with the mounting plate through a bearing, a movable plate is mounted at the upper ends of the guide rod and the first screw rod, a first piston is arranged in the fixed cylinder, and a piston rod is arranged at the upper end of the first piston; the cuvette has the beneficial effects that the extraction of reagents can be realized by rotating the first screw rod, the reagents are controlled to enter the cuvette through the guide pipe, the usage amount of the reagents can be accurately controlled, and meanwhile, the extraction of various different reagents can be realized at one time.

Description

Technical Field

[0001] The utility model relates to the technical field of food detection, in particular to a sample introduction device of an ultraviolet spectrophotometer for food detection. Background Art

[0002] Ultraviolet spectrophotometer is an effective means to study the composition, structure and interaction of substances based on the absorption spectrum of substances. Ultraviolet spectrophotometer can arbitrarily select light of different wavelengths in the ultraviolet visible light region. The absorption spectrum of a substance is the result of the molecules and atoms in the substance absorbing certain specific wavelengths of light energy in the incident light, and the corresponding molecular vibration energy level transition and electronic energy level transition occur. Since various substances have different molecules, atoms and different molecular spatial structures, their absorption of light energy will not be the same. Therefore, each substance has its own unique and fixed absorption spectrum curve, and the content of the substance can be judged or measured based on the absorbance at certain characteristic wavelengths on the absorption spectrum.

[0003] When testing food, an ultraviolet spectrophotometer is needed for testing. Generally, the reagents are manually extracted and then placed in a cuvette. Not only can the amount of reagents not be accurately controlled, but only one reagent can be operated at a time, which affects efficiency. Utility Model Content

[0004] The utility model aims to provide a sample introduction device for an ultraviolet spectrophotometer for food detection, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sample injection device of an ultraviolet spectrophotometer for food detection, comprising a base and a cuvette, a fixing rod and a fixing plate are arranged on the upper surface of the base, an injection assembly is installed on the upper end of the fixing rod, the injection assembly comprises a mounting plate and a plurality of fixing cylinders arranged on the lower surface of the mounting plate, a guide rod and a first screw are arranged at both ends of the mounting plate, the lower end of the first screw passes through the mounting plate and is rotatably connected to the mounting plate through a bearing, a movable plate is installed at the upper ends of the guide rod and the first screw, a first piston is arranged inside the fixing cylinder, a piston rod is arranged at the upper end of the first piston, the upper end of the piston rod passes through the through hole of the mounting plate and is fixedly connected to the lower surface of the movable plate, a conduit is arranged at the lower end of the fixing cylinder, the fixing plate is arranged between the two fixing rods, and a placement groove is opened on the upper surface of the fixing plate, and the cuvette is placed in the placement groove.

[0006] Preferably, the fixing tube, the guide rod and the placement groove are coaxially arranged.

[0007] Preferably, the fixing tube and the placement groove are both provided in plurality.

[0008] Preferably, a connection groove is formed on the upper end surface of the fixing rod, both ends of the mounting plate are located in the connection groove, and both ends of the mounting plate are fixedly provided with limit blocks on the outer side of the fixing rod.

[0009] Preferably, a fixing component is provided on the base, and the fixing component includes a chamber opened inside the base, a plurality of suction cups arranged on the lower surface of the base, and an air suction mechanism arranged on the upper surface of the base, the suction cup is connected to the chamber through an air duct, and the air suction mechanism is connected to the chamber through an air pipe.

[0010] Preferably, the suction mechanism includes a shell fixedly connected to the base, a second piston arranged inside the shell, a second screw is arranged on the upper surface of the second piston, the upper end of the second screw extends to the outside of the shell and is threadedly connected to the shell.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The sample injection assembly is arranged at the upper end of the fixed rod, and the movable plate of the sample injection assembly is connected to the mounting plate through the guide rod and the first screw rod, and the movable plate is connected to the first piston through the piston rod. In the process of use, the reagent can be extracted by rotating the first screw rod, and the reagent can be controlled to enter the cuvette through the catheter, and the amount of reagent used can be accurately controlled, and a variety of different reagents can be extracted at a time;

[0013] 2. By arranging a fixing component on the base, when in use, by rotating the second screw of the suction mechanism, the suction cup of the fixing component can be tightly connected to the desktop, thereby ensuring the overall stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the housing of the utility model;

[0016] Figure 3 It is a side view of the fixing rod of the utility model.

[0017] In the figure: 1. base; 2. cuvette; 3. fixed rod; 4. fixed plate; 5. mounting plate; 6. fixed cylinder; 7. guide rod; 8. first screw; 9. movable plate; 10. first piston; 11. piston rod; 12. conduit; 13. connecting groove; 14. limit block; 15. chamber; 16. suction cup; 17. shell; 18. second piston; 19. second screw. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-3 The utility model provides a technical solution: a sample injection device for an ultraviolet spectrophotometer for food detection, comprising a base 1 and a cuvette 2, a fixing rod 3 and a fixing plate 4 are arranged on the upper surface of the base 1, a sample injection assembly is installed on the upper end of the fixing rod 3, the sample injection assembly comprises a mounting plate 5 and a plurality of fixing cylinders 6 arranged on the lower surface of the mounting plate 5, a guide rod 7 and a first screw rod 8 are arranged at both ends of the mounting plate 5, the lower end of the first screw rod 8 passes through the mounting plate 5 and is rotatably connected with the mounting plate 5 through a bearing, a movable plate 9 is installed on the upper ends of the guide rod 7 and the first screw rod 8, a first piston 10 is arranged inside the fixing cylinder 6, a piston rod 11 is arranged on the upper end of the first piston 10, the upper end of the piston rod 11 passes through the through hole of the mounting plate 5 and is fixedly connected with the lower surface of the movable plate 9, a guide tube 12 is arranged on the lower end of the fixing cylinder 6, the fixing plate 4 is arranged between the two fixing rods 3, and a placement groove is opened on the upper surface of the fixing plate 4, and the cuvette 2 is placed in the placement groove.

[0020] The fixing tube 6 , the guide rod 7 and the placement groove are coaxially arranged, and a plurality of the fixing tube 6 and the placement groove are provided.

[0021] The upper end surface of the fixing rod 3 is provided with a connection groove 13 , and both ends of the mounting plate 5 are located in the connection groove 13 , and both ends of the mounting plate 5 are fixedly provided with limit blocks 14 on the outer side of the fixing rod 3 .

[0022] The base 1 is provided with a fixing component, which includes a chamber 15 opened inside the base 1, a plurality of suction cups 16 arranged on the lower surface of the base 1, and an air suction mechanism arranged on the upper surface of the base 1, the suction cup 16 is connected to the chamber 15 through an airway, and the air suction mechanism is connected to the chamber 15 through an air pipe.

[0023] The suction mechanism includes a shell 17 fixedly connected to the base 1, and a second piston 18 arranged inside the shell 17. A second screw 19 is arranged on the upper surface of the second piston 18. The upper end of the second screw 19 extends to the outside of the shell 17 and is connected to the shell 17 by threads.

[0024] Specifically, when using the utility model, the mounting plate 5 together with the fixed cylinder 6 and the conduit 7 on the lower surface are moved to the top of multiple test tubes, and then the lower end of the conduit 7 is placed inside the test tube, and the first screw 8 is rotated to cause the movable rod 9 to drive the first piston 10 to move upward to extract the reagent, and the cuvette 2 is placed in the placement groove. At this time, the two ends of the mounting plate 5 are placed in the connecting groove 13 at the upper end of the fixed rod 3, and the limit blocks 14 are placed at the two ends of the upper end of the fixed rod 3 to ensure that the conduit 12 is directly above the cuvette 2, and the first screw 8 is rotated in the opposite direction to allow the reagent inside the fixed cylinder 6 to enter the cuvette 2 through the conduit 12 through the first piston 10.

[0025] Before use, place the entire device on a desktop, and by rotating the second screw 19, drive the second piston 18 inside the shell 17 to move upward, extract the air in the chamber 15, form negative pressure, and then make the suction cup 16 tightly connected to the desktop to ensure the stability of the entire device.

Claims

1. A sample injection device for an ultraviolet spectrophotometer for food testing, characterized in that , comprising a base (1) and a cuvette (2), wherein the upper surface of the base (1) is provided with a fixing rod (3) and a fixing plate (4), an upper end of the fixing rod (3) is provided with an injection assembly, the injection assembly comprises a mounting plate (5) and a plurality of fixing cylinders (6) arranged on the lower surface of the mounting plate (5), a guide rod (7) and a first screw rod (8) are respectively arranged at both ends of the mounting plate (5), the lower end of the first screw rod (8) passes through the mounting plate (5) and is rotatably connected to the mounting plate (5) through a bearing, the guide rod (7) and the first screw rod (8) A movable plate (9) is installed at the upper end of the fixing cylinder (8), a first piston (10) is arranged inside the fixing cylinder (6), a piston rod (11) is arranged at the upper end of the first piston (10), the upper end of the piston rod (11) passes through the through hole of the fixing plate (5) and is fixedly connected to the lower surface of the movable plate (9), a conduit (12) is arranged at the lower end of the fixing cylinder (6), the fixing plate (4) is arranged between the two fixing rods (3), and a placement groove is opened on the upper surface of the fixing plate (4), and the cuvette (2) is placed in the placement groove.

2. The sample injection device of a UV spectrophotometer for food testing according to claim 1, characterized in that: The fixing cylinder (6), the guide rod (7) and the placement groove are coaxially arranged.

3. The sample injection device of a UV spectrophotometer for food testing according to claim 1, characterized in that: The fixing cylinder (6) and the placement groove are both provided in plurality.

4. The sample injection device of a UV spectrophotometer for food testing according to claim 1, characterized in that: The upper end surface of the fixing rod (3) is provided with a connection groove (13), the two ends of the mounting plate (5) are located in the connection groove (13), and both ends of the mounting plate (5) are fixedly provided with limit blocks (14) on the outer side of the fixing rod (3).

5. The sample injection device of the ultraviolet spectrophotometer for food testing according to claim 1, characterized in that: The base (1) is provided with a fixing component, the fixing component comprising a chamber (15) opened inside the base (1), a plurality of suction cups (16) arranged on the lower surface of the base (1), and an air suction mechanism arranged on the upper surface of the base (1), the suction cups (16) being connected to the chamber (15) via an air passage, and the air suction mechanism being connected to the chamber (15) via an air pipe.

6. The sample injection device of the ultraviolet spectrophotometer for food testing according to claim 5, characterized in that: The air suction mechanism comprises a shell (17) fixedly connected to the base (1), and a second piston (18) arranged inside the shell (17); a second screw (19) is arranged on the upper surface of the second piston (18); the upper end of the second screw (19) extends to the outside of the shell (17) and is connected to the shell (17) by a thread.

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