A sample introduction device for atomic absorption graphite furnace spectrophotometer

Abstract

The utility model discloses a kind of sample introduction devices of atomic absorption graphite furnace spectrophotometer, it is related to spectrophotometer sample introduction technical field.This kind of sample introduction device of atomic absorption graphite furnace spectrophotometer, including spectrophotometer and sampling head;Sample introduction mechanism, the sample introduction mechanism includes the mounting plate of fixed connection on the upper end of spectrophotometer, the side wall of the mounting plate is fixedly connected with sample introduction box, the inner wall of the sample introduction box is sealingly slidably connected with sliding plug, the inner wall of the sample introduction box is fixedly connected with one-way sample introduction pipe, the other end of the one-way sample introduction pipe is communicated with the sample inlet of spectrophotometer, the inner wall of the sample introduction box is fixedly connected with one-way sampling tube, the other end of the one-way sampling tube is communicated with sampling head.The utility model can inject material into spectrophotometer by driving motor forward rotation, the mechanical mechanism is used, compared with artificial injection, it is more simple and quick to operate, and material spilling situation cannot appear, and it is suitable for batch rapid sample introduction.

Description

Technical Field

[0001] This utility model relates to the field of spectrophotometer sample introduction technology, specifically to a sample introduction device for an atomic absorption graphite furnace spectrophotometer. Background Technology

[0002] Graphite furnaces are non-flame atomizers used in atomic absorption spectrometry. They are a widely used type of electrothermal atomizer. Essentially, a graphite atomizer is a graphite resistance heater. It uses a large current to heat a high-resistance graphite tube, generating a high temperature of up to 3000°C, which melts the graphite tube with a small amount of solid sample solution inside, thus obtaining free atoms.

[0003] Currently, in atomic absorption graphite furnace spectrophotometers, the material is usually injected manually into the spectrophotometer, which is quite cumbersome. Moreover, due to manual operation, some material may leak out and contaminate the injection port. Furthermore, manual injection cannot meet the requirements for batch injection, resulting in low efficiency. Based on this, we propose an injection device for atomic absorption graphite furnace spectrophotometers. Utility Model Content

[0004] The purpose of this invention is to provide a sample introduction device for an atomic absorption graphite furnace spectrophotometer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sample introduction device for an atomic absorption graphite furnace spectrophotometer, comprising: a spectrophotometer and a sampling head; The sample injection mechanism includes a mounting plate fixedly connected to the upper end of the spectrophotometer, a sample injection chamber fixedly connected to the side wall of the mounting plate, a sliding plug slidably connected to the inner wall of the sample injection chamber, a one-way sample injection tube fixedly connected to the inner wall of the sample injection chamber, the other end of the one-way sample injection tube communicating with the sample inlet of the spectrophotometer, and a one-way sampling tube fixedly connected to the inner wall of the sample injection chamber, the other end of the one-way sampling tube communicating with the sampling head. The sample injection chamber is equipped with a drive mechanism that drives the sliding of the slide plug.

[0006] Preferably, the driving mechanism includes a slider slidably connected to the inner wall of the injection chamber, two connecting rods symmetrically fixedly connected to the lower end of the slider, the lower ends of the two connecting rods being fixedly connected to a slide plug, and a reciprocating screw rotatably connected to the top of the injection chamber, the side wall of the reciprocating screw being threadedly connected to the slider.

[0007] Preferably, the drive mechanism further includes a motor fixedly connected to the upper end of the mounting plate via a bracket, a first one-way bearing fixedly connected to the output end of the motor, a second one-way bearing fixedly connected to the other end of the first one-way bearing, and the upper end of the reciprocating screw passing through the upper end of the sample inlet box and fixedly connected to the second one-way bearing.

[0008] Preferably, a cleaning mechanism is installed on the mounting plate. The cleaning mechanism includes a mounting block fixedly connected to the side wall of the mounting plate, a cleaning cylinder rotatably connected to the upper end of the mounting block, and multiple brush bristles fixedly connected to the inner wall of the cleaning cylinder.

[0009] Preferably, the cleaning mechanism further includes a drive wheel fixedly connected to the side wall of the first one-way bearing, and a driven wheel fixedly connected to the side wall of the cleaning cylinder. The drive wheel is connected to the driven wheel via a synchronous belt.

[0010] Preferably, a placement rack is fixedly connected to the side wall of the mounting plate, and the placement rack is T-shaped.

[0011] Preferably, the sampling head has two symmetrically fixedly connected limit blocks that cooperate with the placement frame on its sidewall.

[0012] Compared with the prior art, the beneficial effects of this utility model are: (1) The sample injection device of the atomic absorption graphite furnace spectrophotometer can inject materials into the spectrophotometer by setting up a sample injection mechanism and a driving mechanism and driving the motor to rotate in the forward direction. The mechanical mechanism is simpler and faster to operate than manual injection, and there will be no spillage of materials. It is suitable for batch rapid sample injection.

[0013] (2) The sampling device of the atomic absorption graphite furnace spectrophotometer has a cleaning mechanism. After the sampling head is used, it can be cleaned to keep the sampling head clean and prevent the material from adhering to the surface of the sampling head. When sampling again, the material adhering to the surface of the sampling head will contaminate the next batch of materials. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the sample introduction device for an atomic absorption graphite furnace spectrophotometer proposed in this utility model. Figure 2 for Figure 1 Side view of the middle structure; Figure 3 for Figure 1 Top view of the structure; Figure 4 for Figure 1 Cross-sectional view of the middle structure; Figure 5 for Figure 4 An enlarged schematic diagram of the structure at point A in the middle.

[0015] In the diagram: 1. Spectrophotometer, 2. Mounting plate, 3. Sample inlet box, 4. Sliding plug, 5. One-way sample inlet tube, 6. One-way sampling tube, 7. Sampling head, 8. Slider, 9. Connecting rod, 10. Reciprocating screw, 11. Motor, 12. First one-way bearing, 13. Second one-way bearing, 14. Mounting block, 15. Cleaning cylinder, 16. Brush bristles, 17. Drive wheel, 18. Driven wheel, 19. Placement rack, 20. Limiting block. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-5 This utility model provides a technical solution: a sample introduction device for an atomic absorption graphite furnace spectrophotometer, comprising: a spectrophotometer 1 and a sampling head 7; The sample injection mechanism includes a mounting plate 2 fixedly connected to the upper end of the spectrophotometer 1, a sample injection box 3 fixedly connected to the side wall of the mounting plate 2, a sliding plug 4 slidably connected to the inner wall of the sample injection box 3, a one-way sample injection tube 5 fixedly connected to the inner wall of the sample injection box 3, the other end of the one-way sample injection tube 5 being connected to the sample inlet of the spectrophotometer 1, the one-way sample injection tube 5 only allows the material in the sample injection box 3 to be discharged, and a one-way sampling tube 6 fixedly connected to the inner wall of the sample injection box 3, the other end of the one-way sampling tube 6 being connected to the sampling head 7, the one-way sampling tube 6 only allows the material in the sampling head 7 to enter the sample injection box 3; The sample injection chamber 3 is equipped with a drive mechanism for sliding the drive plug 4.

[0018] The driving mechanism includes a slider 8 that is slidably connected to the inner wall of the injection chamber 3. Two connecting rods 9 are symmetrically fixedly connected to the lower end of the slider 8. The lower ends of the two connecting rods 9 are fixedly connected to the slide plug 4. A reciprocating screw 10 is rotatably connected to the top of the injection chamber 3. The side wall of the reciprocating screw 10 is threadedly connected to the slider 8.

[0019] The drive mechanism also includes a motor 11 fixedly connected to the upper end of the mounting plate 2 via a bracket. A first one-way bearing 12 is fixedly connected to the output end of the motor 11, and a second one-way bearing 13 is fixedly connected to the other end of the first one-way bearing 12. The upper end of the reciprocating screw 10 passes through the upper end of the sample feeding box 3 and is fixedly connected to the second one-way bearing 13.

[0020] It should be noted that the inner wall of the sample injection box 3 near the motor 11 has a through hole. When the slide plug 4 reciprocates and slides in a sealing manner, the through hole can balance the pressure inside the sample injection box 3, ensuring that the slide plug 4 can slide normally.

[0021] A cleaning mechanism is installed on the mounting plate 2. The cleaning mechanism includes a mounting block 14 fixedly connected to the side wall of the mounting plate 2. A cleaning cylinder 15 is rotatably connected to the upper end of the mounting block 14. Multiple brush bristles 16 are fixedly connected to the inner wall of the cleaning cylinder 15.

[0022] The cleaning mechanism also includes a drive wheel 17 fixedly connected to the side wall of the first one-way bearing 12, and a driven wheel 18 fixedly connected to the side wall of the cleaning cylinder 15. The drive wheel 17 is connected to the driven wheel 18 via a synchronous belt.

[0023] It should be noted that the first one-way bearing 12 and the second one-way bearing 13 are arranged in opposite directions. The output end of the motor 11 is fixedly connected to the inner ring of the first one-way bearing 12, and the outer ring of the second one-way bearing 13 is fixedly connected to the inner ring of the first one-way bearing 12. The reciprocating screw 10 is fixedly connected to the inner ring of the second one-way bearing 13. When the motor 11 rotates in the forward direction, the motor 11 can drive the reciprocating screw 10 to rotate, while the drive wheel 17 does not rotate. When the motor 11 rotates in the reverse direction, the drive wheel 17 rotates, while the reciprocating screw 10 does not rotate.

[0024] The mounting plate 2 has a fixedly connected placement frame 19 on its side wall. The placement frame 19 is T-shaped. The sampling head 7 has two symmetrically fixedly connected limit blocks 20 that cooperate with the placement frame 19 on its side wall. The placement frame 19 has a slot that allows the sampling head 7 to pass through.

[0025] In this invention, during sample injection, the sampling head 7 is placed in a container containing the material, and then the driving motor 11 is rotated in the forward direction. The motor 11 drives the reciprocating screw 10 to rotate through the first one-way bearing 12 and the second one-way bearing 13, which in turn drives the slider 8 to slide back and forth. The slider 8 drives the sliding plug 4 to slide back and forth in a sealing manner through the connecting rod 9, thereby drawing the material into the sample injection box 3 through the sampling head 7 and the one-way sampling tube 6. Then the material is squeezed into the spectrophotometer 1 through the one-way injection tube 5. Compared with manual injection, the operation is simpler and faster, and there is no spillage of material. It is suitable for batch rapid sample injection.

[0026] After use, the sampling head 7 can be inserted into the cleaning cylinder 15. The limiting block 20, together with the placement frame 19, will fix the sampling head 7. Then, the cleaning solution is poured into the cleaning cylinder 15, and then the drive motor 11 rotates in the opposite direction. The motor 11 will drive the drive wheel 17 to rotate through the first one-way bearing 12, which in turn drives the driven wheel 18 to rotate, thereby driving the cleaning cylinder 15 to rotate and the brush bristles 16 to rotate. Together with the cleaning solution, the sampling head 7 is cleaned, keeping the sampling head 7 clean and preventing material from adhering to the surface of the sampling head 7. When sampling again, the material adhering to the surface of the sampling head 7 will not contaminate the next batch of materials.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sample introduction device for an atomic absorption graphite furnace spectrophotometer, characterized in that, include: Spectrophotometer (1) and sampling head (7); The sample injection mechanism includes a mounting plate (2) fixedly connected to the upper end of the spectrophotometer (1), a sample injection box (3) fixedly connected to the side wall of the mounting plate (2), a sliding plug (4) sealed and slidably connected to the inner wall of the sample injection box (3), a one-way sample injection tube (5) fixedly connected to the inner wall of the sample injection box (3), the other end of the one-way sample injection tube (5) being connected to the sample inlet of the spectrophotometer (1), and a one-way sampling tube (6) fixedly connected to the inner wall of the sample injection box (3), the other end of the one-way sampling tube (6) being connected to the sampling head (7). The sample inlet box (3) is equipped with a driving mechanism for sliding the sliding plug (4).

2. The sample introduction device for an atomic absorption graphite furnace spectrophotometer according to claim 1, characterized in that, in: The driving mechanism includes a slider (8) that is slidably connected to the inner wall of the injection box (3). Two connecting rods (9) are symmetrically fixedly connected to the lower end of the slider (8). The lower ends of the two connecting rods (9) are fixedly connected to the slide plug (4). A reciprocating screw (10) is rotatably connected to the top of the injection box (3). The side wall of the reciprocating screw (10) is threadedly connected to the slider (8).

3. The sample introduction device for an atomic absorption graphite furnace spectrophotometer according to claim 2, characterized in that, in: The drive mechanism also includes a motor (11) fixedly connected to the upper end of the mounting plate (2) via a bracket. The output end of the motor (11) is fixedly connected to a first one-way bearing (12), and the other end of the first one-way bearing (12) is fixedly connected to a second one-way bearing (13). The upper end of the reciprocating screw (10) passes through the upper end of the sample box (3) and is fixedly connected to the second one-way bearing (13).

4. The sample introduction device for an atomic absorption graphite furnace spectrophotometer according to claim 3, characterized in that, in: A cleaning mechanism is installed on the mounting plate (2). The cleaning mechanism includes a mounting block (14) fixedly connected to the side wall of the mounting plate (2). A cleaning cylinder (15) is rotatably connected to the upper end of the mounting block (14). Multiple brush bristles (16) are fixedly connected to the inner wall of the cleaning cylinder (15).

5. The sample introduction device for an atomic absorption graphite furnace spectrophotometer according to claim 4, characterized in that, in: The cleaning mechanism also includes a drive wheel (17) fixedly connected to the side wall of the first one-way bearing (12), and a driven wheel (18) fixedly connected to the side wall of the cleaning cylinder (15). The drive wheel (17) is connected to the driven wheel (18) via a synchronous belt.

6. The sample introduction device for an atomic absorption graphite furnace spectrophotometer according to claim 5, characterized in that, in: The mounting plate (2) has a fixedly connected placement rack (19) on its side wall, and the placement rack (19) is T-shaped.

7. The sample introduction device for an atomic absorption graphite furnace spectrophotometer according to claim 6, characterized in that, in: The sampling head (7) has two limiting blocks (20) that cooperate with the placement frame (19) symmetrically fixedly connected to its side wall.

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