A micro-spectrophotometer and detection method thereof

Abstract

The present invention discloses a micro-spectrophotometer and a detection method thereof, which relate to the technical field of experimental instruments, including a light source chamber, an atomizer, an automatic sampler and an oil-free air compressor, wherein the automatic sampler includes a sample placing plate and a sample injection needle, wherein the sample placing plate is used to place sample tubes, and the sample injection needle is used to take samples. The present invention also discloses a detection method of a micro-spectrophotometer, which includes the following steps: sample preparation, instrument calibration, parameter adjustment, data acquisition and data analysis. By setting a trimming component, the present invention can achieve the fixation, stretching and cutting and trimming of the hose by controlling the vertical adjustment component to descend step by step, which is convenient to operate, does not require manual cutting, trimming and disassembly of the hose, and simplifies the steps required for cutting and trimming the hose. In addition, the inclination of the bottom of the hose after cutting and trimming is the same as the angle of the cutting blade, thereby improving the inclination and flatness of the section at the bottom of the hose.

Description

Technical Field

[0001] The invention relates to the technical field of experimental instruments, and in particular to a micro-spectrophotometer and a detection method thereof. Background Art

[0002] Atomic absorption spectrometer, also known as atomic absorption spectrophotometer, analyzes metal elements based on the absorption of characteristic radiation by the ground state atomic vapor of a substance. It can sensitively and reliably determine trace or trace elements. Atomic absorption spectrometers are sensitive, accurate, and simple, and are now widely used in the analysis of constant and trace elements in metallurgy, geology, mining, petroleum, light industry, agriculture, medicine, health, food, and environmental monitoring. An autosampler is a device used for quantitative sampling and sample delivery on an atomic absorption spectrophotometer. The sampling efficiency of the autosampler has a certain influence on the detection results of the photometer.

[0003] For example, an automatic sampler with publication number CN115236353A includes a sample injection needle and a sample tray rack, the sample injection needle is arranged on the sample injection mechanism, the sample tray rack is arranged on the sample delivery mechanism through the sample tray support, the sample tray support is fixedly arranged below the sample tray rack, the sample injection mechanism and the sample delivery mechanism are both arranged on the bottom plate, the lower end of the bottom plate is arranged on the translation mechanism, the sample injection mechanism includes a rotating arm motor and an electric lifting mechanism and a sample injection pump installed on the bottom plate, the electric lifting mechanism is vertically arranged, the rotating arm motor is fixedly installed on the top of the lifting mechanism, the output end of the rotating arm motor is fixedly connected to the sample injection rod through the sample injection rod connecting sleeve, the sample injection rod is horizontally arranged, the sample injection needle is vertically arranged at one end of the sample injection rod away from the rotating arm motor, and is located above the sample tray rack, and the sample injection needle is connected to the sample injection pump through a hose. The above scheme can better perform sampling and sample delivery, and the sample needle is stable in rising and falling, with high precision and high work efficiency.

[0004] In the actual detection process, the injection needle may come into contact with the outside world during the descending sampling process due to human error or equipment error. Due to the lack of protection for the injection needle and the fixed installation of the injection needle on the automatic sampler, the injection needle will bend due to rigid collision with the outside world, thus causing damage to the injection needle. At the same time, due to frequent contact with the sample and the outside world, the bottom of the hose of the injection needle tip is prone to corrosion or wear and tear, resulting in notches or burrs. The manual cutting and trimming process of the hose is relatively cumbersome, and the inclination and flatness of the cross section at the bottom of the hose cannot be guaranteed.

[0005] Therefore, it is necessary to invent a micro-spectrophotometer and a detection method thereof to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a micro-spectrophotometer and a detection method thereof to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a micro-spectrophotometer, comprising a light source chamber, an atomizer, an automatic sampler and an oil-free air compressor, wherein the automatic sampler comprises a sample placing plate and a sample injection needle, wherein the sample placing plate is used to place a sample tube, and the sample injection needle is used to sample a sample, and the automatic sampler further comprises:

[0008] A vertical adjustment component, comprising a lifting slot opened on the top of the sample placement plate, a lifting frame being slidably arranged inside the lifting slot, and the vertical adjustment component is used to adjust the vertical position of the injection needle;

[0009] An angle adjustment assembly, comprising a rotating frame rotatably arranged on the top of the lifting frame, and the angle adjustment assembly is used to adjust the rotation angle of the injection needle;

[0010] A horizontal adjustment assembly, comprising a connection plate disposed at one end of the rotating frame, and the horizontal adjustment assembly is used to adjust the horizontal position of the injection needle;

[0011] The anti-bending assembly comprises a plurality of limiting sleeve rods, the plurality of limiting sleeve rods are evenly fixedly arranged at the bottom of the connecting plate, a limiting rod is slidably arranged inside each of the limiting sleeve rods, a mounting plate is fixedly connected to the bottom of the plurality of limiting rods, a buffer spring is fixedly arranged between the mounting plate and the connecting plate, the injection needle is arranged on the mounting plate, and the anti-bending assembly is used to prevent the injection needle from bending during the sampling process;

[0012] A trimming assembly is arranged on the top of the sample placing plate, and is used for cutting and trimming the rubber hose at the needle tip of the injection needle.

[0013] Preferably, the trimming assembly includes an air storage portion and a trimming groove, the air storage portion is fixedly arranged inside the lifting groove, and the air storage portion is located below the lifting frame, the trimming groove is opened at the top of the sample placement disk, and the interior of the sample placement disk is symmetrically provided with two first air cavities located at the outer periphery of the bottom of the trimming groove, each of the first air cavities is sealed and slidably provided with a first piston plate, one side of each first piston plate is fixedly provided with a first piston rod that penetrates into the trimming groove, one end of each first piston rod is fixedly provided with an extrusion plate located in the trimming groove, a reset spring is fixedly provided between the other side of each first piston plate and the corresponding first air cavity, a first air dividing ring located at the outer periphery of the two first air cavities is opened inside the sample placement disk, each of the first air cavities is communicated with the first air dividing ring, and a first air duct is connected between the first air dividing ring and the air storage portion.

[0014] Preferably, the trimming assembly also includes a support plate slidably arranged inside the trimming groove, a plurality of sliding cavities located on the outer periphery of the top of the trimming groove are evenly opened inside the sample plate, a plurality of sliding plates that can slide in the corresponding side sliding cavities are fixedly arranged on the outer periphery of the support plate, an elastic air bag is fixedly arranged on the bottom of each sliding cavity, a second air dividing ring located on the outer periphery of the plurality of sliding cavities is opened inside the sample plate, each of the elastic air bags is connected to the second air dividing ring, and a second air duct is connected between the first air dividing ring and the second air dividing ring.

[0015] Preferably, the trimming assembly also includes two second air cavities opened inside the sampling disk, and the two second air cavities are symmetrically arranged on the middle periphery of the trimming groove, each of the second air cavities is connected to the second air channel on the same side, and a second piston plate is sealed and slidably arranged inside each of the second air cavities, and a second piston rod that penetrates into the trimming groove is fixedly arranged on one side of each of the second piston plates, a cutting blade located inside the trimming groove is fixedly arranged on one end of the second piston rod on one side, and a pad located inside the trimming groove is fixedly arranged on one end of the second piston rod on the other side, and a return spring is sleeved on each of the second piston rods.

[0016] Preferably, the elastic coefficient of the return tension spring is smaller than the elastic coefficient of the elastic airbag, and the elastic coefficient of the elastic airbag is smaller than the elastic coefficient of the return spring.

[0017] Preferably, the vertical adjustment assembly further comprises a vertical telescopic rod, the bottom of the fixed end of the vertical telescopic rod is fixedly arranged at the bottom of the lifting slot, and the top of the movable end of the vertical telescopic rod is fixedly arranged at the bottom of the lifting frame.

[0018] Preferably, the angle adjustment assembly also includes an angle adjustment motor, which is fixedly arranged inside the lifting frame, and a drive shaft of the angle adjustment motor passes through the top of the lifting frame and is fixedly connected to the rotating frame, a limiting groove is provided on the top of the lifting frame, and a limiting block placed inside the limiting groove is fixedly arranged at the bottom of the rotating frame.

[0019] Preferably, the horizontal adjustment component also includes a horizontal telescopic rod, the fixed end of the horizontal telescopic rod is fixedly arranged on the top of the rotating frame, and the movable end of the horizontal telescopic rod is fixedly connected to the connecting plate, a sliding groove is opened through the interior of the rotating frame, a sliding rod is fixedly arranged on one side of the connecting plate, and the sliding rod is slidably arranged in the sliding groove.

[0020] Preferably, each of the limiting sleeve rods is provided with a slot, each of the limiting rods is fixedly provided with a block, and each of the block is slidably provided in the corresponding slot.

[0021] A detection method of a micro-spectrophotometer is also provided, comprising the following steps:

[0022] Step 1: Sample preparation: dilute the liquid sample to be tested, grind the solid sample to be tested and then dissolve and dilute it, and place the prepared sample to be tested in a sample placement tray;

[0023] Step 2: Instrument calibration: use standard samples to calibrate the instrument;

[0024] Step 3: Parameter adjustment: adjust the light source chamber, atomizer, autosampler and detector according to the measurement requirements;

[0025] Step 4: Data collection: testing the samples to be tested and recording the test data;

[0026] Step 5: Data analysis: Use the instrument's data processing software to process and analyze the recorded test data and obtain the corresponding test results.

[0027] Technical effects and advantages of the present invention:

[0028] 1. The present invention realizes the overall adjustment of the sampling position of the injection needle through the coordinated use of the vertical adjustment component, the angle adjustment component and the horizontal adjustment component, so that the injection needle can meet the sampling of samples at different positions, thereby improving the applicability of the automatic sampler. Through the coordinated use of the limit sleeve rod and the limit rod, when the injection needle collides with the outside world during the descent process, the injection needle and the mounting plate can move upward adaptively, thereby avoiding the injection needle from bending due to rigid collision and extending the service life of the injection needle.

[0029] 2. The present invention uses the gas storage part, the first piston plate, the extrusion plate, the support plate, the elastic airbag, the second piston plate, the cutting blade and the cushion block in coordination, so that the fixing, stretching and cutting and trimming of the needle tip part of the hose of the injection needle can be achieved by controlling the vertical adjustment component to descend step by step. The steps are clear and the operation is convenient. There is no need to manually cut, trim and disassemble the hose, which extends the service life of the injection needle and simplifies the steps required for cutting and trimming the hose. In addition, the inclination of the bottom of the hose after cutting and trimming is the same as the angle of the cutting blade, which improves the inclination and flatness of the cross-section of the bottom of the hose. At the same time, the direction of the cross-section of the hose after cutting and trimming remains the same as before. While there is no need to adjust the direction of the cross-section of the hose, the direction of the cross-section of the hose is accurate, which avoids the impact of the inadequate installation of the injection needle on the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 It is a schematic structural diagram of the automatic sample injector of the present invention.

[0032] Figure 3It is a structural schematic diagram of the lifting frame of the present invention.

[0033] Figure 4 Schematic diagram of the position of the first airway of the present invention.

[0034] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0035] Figure 6 For the present invention Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0036] Figure 7 Schematic diagram of the position of the second airway of the present invention.

[0037] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at point C in the middle.

[0038] Fig. 9 The state of the trimming assembly when the gas storage part of the present invention is not squeezed is shown Figure 1 .

[0039] Fig.10 The state of the trimming assembly when the gas storage part of the present invention is not squeezed is shown Figure 2 .

[0040] Fig.11 The state of the trimming assembly when the gas storage portion of the present invention is squeezed to the first depth is shown in FIG. Figure 1 .

[0041] Fig.12 The state of the trimming assembly when the gas storage portion of the present invention is squeezed to the first depth is shown in FIG. Figure 2 .

[0042] Fig.13 The state of the trimming assembly when the gas storage portion of the present invention is squeezed to the second depth is shown in FIG. Figure 1 .

[0043] Fig.14 The state of the trimming assembly when the gas storage portion of the present invention is squeezed to the second depth is shown in FIG. Figure 2 .

[0044] Fig.15 The state of the trimming assembly when the gas storage portion of the present invention is squeezed to the third depth is shown in FIG. Figure 1 .

[0045] Fig.16 The state of the trimming assembly when the gas storage portion of the present invention is squeezed to the third depth is shown in FIG. Figure 2 .

[0046] In the figure: 1, light source chamber; 2, atomizer; 3, automatic sampler; 4, oil-free air compressor; 31, sample tray; 32, sample needle; 33, vertical adjustment assembly; 34, angle adjustment assembly; 35, horizontal adjustment assembly; 36, anti-bending assembly; 37, trimming assembly; 3301, lifting slot; 3302, lifting frame; 3303, vertical telescopic rod; 3401, rotating frame; 3402, angle adjustment motor; 3403, limit slot; 3404, limit block; 3501, connecting plate; 3502, horizontal telescopic rod; 3503, slide slot; 3504, slide rod; 3601, limit sleeve rod; 3602, limit rod; 3603, mounting plate; 36 04, buffer spring; 3605, card slot; 3606, card block; 3701, air storage unit; 3702, trimming groove; 3703, first air cavity; 3704, first piston plate; 3705, first piston rod; 3706, extrusion plate; 3707, reset spring; 3708, first air dividing ring; 3709, first air channel; 3710, support plate; 3711, sliding cavity; 3712, sliding plate; 3713, elastic air bag; 3714, second air dividing ring; 3715, second air channel; 3716, second air cavity; 3717, second piston plate; 3718, second piston rod; 3719, cutting blade; 3720, pad; 3721, reset spring. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Embodiment 1, the present invention provides as follows Figures 1 to 5 The micro-spectrophotometer shown includes a light source chamber 1, an atomizer 2, an automatic sampler 3 and an oil-free air compressor 4. The automatic sampler 3 includes a sample tray 31 and a sample injection needle 32. The sample tray 31 is used to place sample tubes, and the sample injection needle 32 is used to sample samples.

[0049] The automatic sampler 3 includes a vertical adjustment component 33, an angle adjustment component 34, a horizontal adjustment component 35 and an anti-bending component 36. The vertical adjustment component 33 is used to adjust the vertical position of the injection needle 32, the angle adjustment component 34 is used to adjust the rotation angle of the injection needle 32, the horizontal adjustment component 35 is used to adjust the horizontal position of the injection needle 32, and the anti-bending component 36 is used to prevent the injection needle 32 from bending during the sampling process. The vertical adjustment component 33, the angle adjustment component 34 and the horizontal adjustment component 35 cooperate with each other to achieve overall adjustment of the sampling position of the injection needle 32.

[0050] The vertical adjustment component 33 includes a lifting slot 3301 and a vertical telescopic rod 3303. The lifting slot 3301 is opened at the top of the sample plate 31. A lifting frame 3302 is slidably arranged inside the lifting slot 3301. The bottom of the fixed end of the vertical telescopic rod 3303 is fixedly arranged at the bottom of the lifting slot 3301, and the top of the movable end of the vertical telescopic rod 3303 is fixedly arranged at the bottom of the lifting frame 3302.

[0051] The angle adjustment assembly 34 includes a rotating frame 3401 and an angle adjustment motor 3402. The rotating frame 3401 is rotatably arranged on the top of the lifting frame 3302. The angle adjustment motor 3402 is fixedly arranged inside the lifting frame 3302. The driving shaft of the angle adjustment motor 3402 passes through the top of the lifting frame 3302 and is fixedly connected to the rotating frame 3401. A limiting groove 3403 is provided on the top of the lifting frame 3302. A limiting block 3404 is fixedly arranged at the bottom of the rotating frame 3401 and is placed inside the limiting groove 3403. The limiting groove 3403 and the limiting block 3404 cooperate with each other, thereby further improving the rotation stability of the rotating frame 3401 on the top of the lifting frame 3302.

[0052] The horizontal adjustment component 35 includes a connecting plate 3501 and a horizontal telescopic rod 3502. The connecting plate 3501 is arranged at one end of the rotating frame 3401. The fixed end of the horizontal telescopic rod 3502 is fixedly arranged on the top of the rotating frame 3401, and the movable end of the horizontal telescopic rod 3502 is fixedly connected to the connecting plate 3501. A sliding groove 3503 is opened inside the rotating frame 3401. A sliding rod 3504 is fixedly arranged on one side of the connecting plate 3501, and the sliding rod 3504 is slidably arranged in the sliding groove 3503. The sliding rod 3504 and the sliding groove 3503 cooperate with each other, which further improves the movement stability of the connecting plate 3501 in the horizontal direction.

[0053] The anti-bending component 36 includes a plurality of limit rods 3601, which are evenly fixed at the bottom of the connecting plate 3501. A limit rod 3602 is slidably arranged inside each limit rod 3601. The bottoms of the plurality of limit rods 3602 are commonly fixedly connected with a mounting plate 3603. A buffer spring 3604 is fixedly arranged between the mounting plate 3603 and the connecting plate 3501. The injection needle 32 is arranged on the mounting plate 3603. A slot 3605 is provided on each limiting sleeve rod 3601, and a block 3606 is fixedly provided on each limiting rod 3602. Each block 3606 is slidably set in the corresponding slot 3605. The slot 3605 and the block 3606 cooperate with each other to limit the lowest position of the mounting plate 3603 to prevent the limiting rod 3602 from escaping from the limiting sleeve rod 3601. In the initial state, the buffer spring 3604 presses the mounting plate 3603 downward, and the block 3606 is located at the lowest position of the slot 3605.

[0054] In summary, during the sampling process, the vertical telescopic rod 3303 drives the lifting frame 3302 to rise and fall in the lifting slot 3301 to adjust the vertical height of the sampling needle 32, the angle adjustment motor 3402 drives the rotating frame 3401 to rotate at the top of the lifting frame 3302 to adjust the rotation angle of the sampling needle 32, and the horizontal telescopic rod 3502 drives the connecting plate 3501 to extend and retract in the horizontal direction to adjust the horizontal position of the sampling needle 32. By adjusting the vertical height, rotation angle and horizontal position of the sampling needle 32, the overall adjustment of the sampling position of the sampling needle 32 is achieved. In addition, when the sampling needle 32 is lowered to perform sampling or sample delivery operations, if the bottom end of the sampling needle 32 touches the outside world, the sampling needle 32 will drive the mounting plate 3603 to move upward under the action of the outside world, and the limiting rod 3602 moves upward in the limiting sleeve rod 3601, and the buffer spring 3604 is squeezed to prevent the sampling needle 32 from being subjected to rigid collision.

[0055] Through the coordinated use of the vertical adjustment component 33, the angle adjustment component 34 and the horizontal adjustment component 35, the sampling position of the injection needle 32 is adjusted as a whole, so that the injection needle 32 can meet the sampling of samples at different positions, and the applicability of the automatic sampler 3 is improved. Through the coordinated use of the limiting sleeve rod 3601 and the limiting rod 3602, when the injection needle 32 collides with the outside world during the descent process, the injection needle 32 and the mounting plate 3603 can move upward adaptively, avoiding the bending of the injection needle 32 due to rigid collision, and extending the service life of the injection needle 32. At the same time, when the injection needle 32 does not touch the outside world, the buffer spring 3604 will press the mounting plate 3603 downward, and the clamping block 3606 is always located at the lowest position of the clamping slot 3605, so that the injection needle 32 is always at the lowest position relative to the connecting plate 3501, and the stability of the sampling process is improved.

[0056] Embodiment 2: During the actual testing process, the staff found that the tip of the sample needle 32 is in frequent contact with the sample and the outside world, which makes the bottom of the sample needle 32 prone to corrosion or wear, resulting in broken notches or burrs at the bottom of the sample needle, which will inevitably affect the sampling effect and the test results. When the sample needle 32 is corroded or worn, the staff usually manually removes the sample needle 32 from the automatic sampler 3, and then cuts and trims the sample needle with a handheld tool. After the trimming, the sample needle 32 is installed back on the automatic sampler 3. The process is relatively cumbersome, and because the sample needle 32 is relatively slender, repeated disassembly and assembly of the sample needle 32 will cause damage to it. At the same time, when cutting and trimming the sample needle, in order to ensure the sampling effect, the bottom of the sample needle is generally cut into an inclined section at 45° to the vertical direction, and manual cutting cannot ensure the inclination and flatness of the section at the bottom of the sample needle. Therefore, based on the above problems, the scheme of the present invention is further improved.

[0057] like Figure 2-16As shown, the trimming assembly 37 is arranged on the top of the sample placing plate 31, and the trimming assembly 37 is used to trim the rubber hose at the needle tip of the injection needle 32. The trimming assembly 37 includes a gas storage part 3701 and a trimming groove 3702. The gas storage part 3701 is fixedly arranged inside the lifting groove 3301, and the gas storage part 3701 is located below the lifting frame 3302. The gas storage part 3701 is made of elastic material, and is pre-filled with gas. When it is squeezed, it will deform accordingly, and when the squeezing force disappears, it will automatically return to a natural state. The trimming groove 3702 is opened on the top of the sample placing plate 31, and a collecting groove is opened at the bottom of the trimming groove 3702. The collecting groove is used to collect the cut rubber hose. Two first air cavities 3703 located at the bottom periphery of the trimming groove 3702 are symmetrically provided inside the sample plate 31, and a first piston plate 3704 is sealed and slidably arranged inside each first air cavity 3703, and a first piston rod 3705 that penetrates into the trimming groove 3702 is fixedly provided on one side of each first piston plate 3704, and an extrusion plate 3706 located inside the trimming groove 3702 is fixedly provided at one end of each first piston rod 3705, and a reset spring 3707 is fixedly provided between the other side of each first piston plate 3704 and the corresponding first air cavity 3703, and a first air dividing ring 3708 located at the periphery of the two first air cavities 3703 is provided inside the sample plate 31, and each first air cavity 3703 is connected to the first air dividing ring 3708, and a first air duct 3709 is connected between the first air dividing ring 3708 and the air storage part 3701. When the gas storage part 3701 is squeezed, the gas inside it will flow into the first gas dividing ring 3708 through the first gas channel 3709, and enter the two first air cavities 3703 through the first gas dividing ring 3708, thereby pushing the first piston plate 3704 to slide in the corresponding first air cavity 3703, and then the two first piston rods 3705 drive the two extrusion plates 3706 to approach each other, and in this process, the two reset springs 3707 are in a stretched state.

[0058] A support plate 3710 is provided for sliding inside the trimming groove 3702, and the support plate 3710 is of an annular structure. A plurality of sliding cavities 3711 located at the outer periphery of the top of the trimming groove 3702 are evenly provided inside the sample plate 31. A plurality of sliding plates 3712 that can slide in the corresponding side sliding cavities 3711 are fixedly provided on the outer periphery of the support plate 3710. An elastic air bag 3713 is fixedly provided at the bottom of each sliding cavity 3711. A second air dividing ring 3714 located at the outer periphery of the plurality of sliding cavities 3711 is provided inside the sample plate 31, and each elastic air bag 3713 is connected to the second air dividing ring 3714. A second air duct 3715 is provided between the first air dividing ring 3708 and the second air dividing ring 3714. When no gas flows into the elastic airbag 3713, the elastic airbag 3713 is in a contracted state, and the sliding plate 3712 and the support plate 3710 are both at the lowest position. When the gas enters the second air dividing ring 3714 through the first air dividing ring 3708 and the second air channel 3715, the gas will enter the multiple elastic airbags 3713 respectively, causing the multiple elastic airbags 3713 to expand synchronously. At this time, the multiple elastic airbags 3713 will push the multiple sliding plates 3712 on their upper parts to move upward synchronously, thereby causing the multiple sliding plates 3712 to drive the support plate 3710 to move upward, and then the support plate 3710 drives the mounting plate 3603 and the injection needle 32 to move upward.

[0059] Two second air cavities 3716 are provided inside the sample plate 31, and the two second air cavities 3716 are symmetrically arranged on the middle periphery of the trimming groove 3702, each second air cavity 3716 is connected to the second air channel 3715 on the same side, and a second piston plate 3717 is sealed and slidably provided inside each second air cavity 3716, and a second piston rod 3718 that penetrates into the trimming groove 3702 is fixedly provided on one side of each second piston plate 3717, and a cutting blade 3719 located inside the trimming groove 3702 is fixedly provided on one end of the second piston rod 3718 on one side, and the cutting blade 3719 is inclined at 45° to the vertical direction, and a pad 3720 located inside the trimming groove 3702 is fixedly provided on one end of the second piston rod 3718 on the other side, and a cutting groove matching the cutting blade 3719 is provided on one side of the pad 3720, and a return spring 3721 is sleeved on each second piston rod 3718. When the gas enters the second air cavity 3716 through the second air channel 3715, the gas will push the two second piston plates 3717 to slide synchronously. The two second piston plates 3717 push the cutting blades 3719 and the pads 3720 closer to each other through the two second piston rods 3718, and during this process, the two return springs 3721 are both in a compressed state.

[0060] It should be noted that the elastic coefficient of the reset tension spring 3707 is smaller than the elastic coefficient of the elastic airbag 3713, and the elastic coefficient of the elastic airbag 3713 is smaller than the elastic coefficient of the reset spring 3721. That is, the reset tension spring 3707 is more likely to be deformed relative to the elastic airbag 3713, and the elastic airbag 3713 is more likely to be deformed relative to the reset spring 3721. Therefore, when the gas in the gas storage portion 3701 is passed into the first air dividing ring 3708, the gas will preferentially push the first piston plate 3704 to slide in the first air cavity 3703, so that the two extrusion plates 3706 are close to each other. When the two extrusion plates 3706 push against each other, the gas will no longer be able to flow into the first air cavity 3703, and at this time, it will enter the multiple elastic airbags 3713 through the second air channel 3715 and the second air dividing ring 3714, so that the multiple elastic airbags 3713 push the support plate 3710 and the injection needle 32 to move upward. When the support plate 3710 moves to the highest position, the gas will no longer be able to flow into the elastic airbag 3713. At this time, the gas will enter the two second air chambers 3716 respectively through the second air channel 3715, and then push the two second piston plates 3717 to slide in the second air chamber 3716, so that the two second piston rods 3718 are close to each other, and then the cutting blade 3719 and the pad 3720 are close to each other.

[0061] In summary, when trimming the rubber hose at the tip of the injection needle 32, first adjust the injection needle 32 to the top of the trimming groove 3702 through the angle adjustment component 34 and the horizontal adjustment component 35, and then drive the injection needle 32 to move into the trimming groove 3702 through the vertical adjustment component 33. When the lifting frame 3302 is lowered to just contact the gas storage part 3701, the lifting frame 3302 has not squeezed the gas storage part 3701 yet, and the state of the trimming component 37 is as follows: Fig. 9 and Fig.10 As shown, at this time, the rubber hose of the needle tip of the injection needle 32 drops to the middle position of the two extrusion plates 3706, and at this time, the two extrusion plates 3706 are still in the initial state of being away from each other under the action of the reset spring 3707, the mounting plate 3603 abuts against the top of the support plate 3710, and the support plate 3710 is still at the lowest position in the initial state, and the cutting blade 3719 and the cushion block 3720 are also in the initial state of being away from each other under the action of the reset spring 3721. Then, the vertical adjustment assembly 33 is controlled to continue to lower. Since the mounting plate 3603 abuts against the top of the support plate 3710 at this time, the position of the injection needle 32 will no longer be lowered, the limit rod 3602 moves upward in the limit sleeve rod 3601, and the buffer spring 3604 is compressed. At the same time, the lifting frame 3302 squeezes the gas storage part 3701 and squeezes it to the first depth. The state of the trimming assembly 37 is as shown in FIG. Fig.11 and Fig.12As shown, at this time, the two extrusion plates 3706 abut against each other and clamp the rubber hose of the needle tip of the injection needle 32. The mounting plate 3603 and the support plate 3710 are still at the lowest position in the initial state, and the cutting blade 3719 and the cushion block 3720 are still in the initial state of being away from each other. Then, the vertical adjustment assembly 33 is controlled to be further lowered, and the lifting frame 3302 squeezes the gas storage part 3701 to the second depth. The state of the trimming assembly 37 is as shown in FIG. Fig.13 and Fig.14 As shown, at this time, the two squeezing plates 3706 are still clamping and fixing the rubber hose at the needle tip of the injection needle 32, and the multiple elastic airbags 3713 are inflated synchronously and push the support plate 3710 and the injection needle 32 to move upward to the highest position. During the upward movement of the injection needle 32, since the rubber hose at the needle tip is clamped and fixed by the two squeezing plates 3706, the rubber hose sleeved on the injection needle 32 will move relative to the injection needle 32, thereby pulling a part of the rubber hose out of the injection needle 32, and at this time, the cutting blade 3719 and the cushion block 3720 are still in the initial state of being away from each other. Then the vertical adjustment component 33 is controlled to be lowered again, and the lifting frame 3302 squeezes the gas storage part 3701 to the third depth. The state of the trimming component 37 is as shown in FIG. Fig.15 and Fig.16 As shown, at this time, the two squeezing plates 3706 still clamp and fix the rubber tube at the needle tip of the injection needle 32, and the rubber tube is partially pulled out from the injection needle 32. At the same time, the gas pushes the cutting blade 3719 and the cushion block 3720 to approach each other and close together through the two second piston plates 3717, so as to cut the rubber tube between them, and the cutting angle of the rubber tube is consistent with that of the cutting blade 3719. At this point, the cutting and trimming of the rubber tube at the needle tip of the injection needle 32 is completed. Control the vertical adjustment component 33 to rise and move the cut injection needle 32 out of the trimming groove 3702. At the same time, as the vertical adjustment component 33 rises, the lifting frame 3302 will no longer squeeze the gas storage part 3701, and the gas will be completely reabsorbed into the gas storage part 3701. The cutting blade 3719 and the cushion block 3720 return to a state of being away from each other, and the two extrusion plates 3706 also return to a state of being away from each other. The cut portion of the hose clamped between the two extrusion plates 3706 falls into the collecting groove.

[0062] Through the coordinated use of the gas storage part 3701, the first piston plate 3704, the extrusion plate 3706, the support plate 3710, the elastic airbag 3713, the second piston plate 3717, the cutting blade 3719 and the cushion block 3720, when the gas storage part 3701 is squeezed to the first depth, the hose is clamped and fixed, when the gas storage part 3701 is squeezed to the second depth, the hose is partially pulled out from the injection needle 32, and when the gas storage part 3701 is squeezed to the third depth, the hose is cut and trimmed. The cutting and trimming work can be achieved by simply controlling the vertical adjustment component 33 to descend, the steps are clear, the operation is convenient, there is no need to manually remove the injection needle 32 first, and then cut and trim the hose with a handheld tool, so that the injection needle 32 is avoided to be repeatedly disassembled and assembled, the service life of the injection needle 32 is extended, the workload of the staff is reduced, and the steps required for cutting and trimming the hose are simplified. Furthermore, the inclination of the bottom of the hose after cutting and trimming is the same as the angle of the cutting blade 3719, which improves the inclination and flatness of the cut surface of the bottom of the hose. At the same time, the cut surface orientation of the hose after cutting and trimming remains the same as before. Compared with manual cutting and trimming of the hose, the cut surface orientation of the hose does not need to be adjusted, and the direction of the cut surface of the hose is ensured to be accurate, thereby avoiding the influence of the detection process caused by the improper installation of the injection needle 32.

[0063] Embodiment 3, the present invention also provides a detection method of a micro-spectrophotometer, comprising the following steps:

[0064] Step 1: Sample preparation: dilute the liquid sample to be tested, grind the solid sample to be tested and then dissolve and dilute it, and put the prepared sample to be tested into the sample placement tray 31;

[0065] Step 2: Instrument calibration: Use standard samples to calibrate the instrument to ensure that the photometer is in an accurate state during the measurement process;

[0066] Step 3: parameter adjustment: adjust the light source chamber 1, atomizer 2, automatic sampler 3 and detector according to the measurement requirements, and set the parameters such as wavelength, exposure time and injection volume;

[0067] Step 4: Data collection: start the data collection program, test the samples to be tested and record the test data;

[0068] Step 5: Data analysis: Use the instrument's data processing software to process and analyze the recorded test data and obtain the corresponding test results.

[0069] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-spectrophotometer, comprising a light source chamber (1), an atomizer (2), an automatic sample injector (3) and an oil-free air compressor (4), characterized in that: The automatic sample injector (3) comprises a sample placing plate (31) and a sample injection needle (32), wherein the sample placing plate (31) is used to place a sample tube, and the sample injection needle (32) is used to take a sample. The automatic sample injector (3) further comprises: A vertical adjustment component (33), comprising a lifting slot (3301) opened at the top of the sample placement plate (31), a lifting frame (3302) being slidably arranged inside the lifting slot (3301), the vertical adjustment component (33) being used to adjust the vertical position of the injection needle (32), the vertical adjustment component (33) further comprising a vertical telescopic rod (3303), the bottom of the fixed end of the vertical telescopic rod (3303) being fixedly arranged at the bottom of the lifting slot (3301), and the top of the movable end of the vertical telescopic rod (3303) being fixedly arranged at the bottom of the lifting frame (3302); An angle adjustment component (34), comprising a rotating frame (3401) rotatably arranged on the top of the lifting frame (3302), the angle adjustment component (34) being used to adjust the rotation angle of the injection needle (32), the angle adjustment component (34) further comprising an angle adjustment motor (3402), the angle adjustment motor (3402) being fixedly arranged inside the lifting frame (3302), and a driving shaft of the angle adjustment motor (3402) passing through the top of the lifting frame (3302) and being fixedly connected to the rotating frame (3401), a limiting groove (3403) being provided on the top of the lifting frame (3302), and a limiting block (3404) being arranged inside the limiting groove (3403) being fixedly arranged on the bottom of the rotating frame (3401); A horizontal adjustment component (35), comprising a connecting plate (3501) arranged at one end of the rotating frame (3401), the horizontal adjustment component (35) being used to adjust the horizontal position of the injection needle (32), the horizontal adjustment component (35) further comprising a horizontal telescopic rod (3502), the fixed end of the horizontal telescopic rod (3502) being fixedly arranged at the top of the rotating frame (3401), and the movable end of the horizontal telescopic rod (3502) being fixedly connected to the connecting plate (3501), a slide groove (3503) being provided through the interior of the rotating frame (3401), a slide rod (3504) being fixedly arranged on one side of the connecting plate (3501), and the slide rod (3504) being slidably arranged in the slide groove (3503); an anti-bending assembly (36), comprising a plurality of limiting sleeve rods (3601), wherein the plurality of limiting sleeve rods (3601) are evenly fixedly arranged at the bottom of the connecting plate (3501), a limiting rod (3602) is slidably arranged inside each of the limiting sleeve rods (3601), a mounting plate (3603) is fixedly connected to the bottom of the plurality of limiting rods (3602), a buffer spring (3604) is fixedly arranged between the mounting plate (3603) and the connecting plate (3501), the injection needle (32) is arranged on the mounting plate (3603), and the anti-bending assembly (36) is used to prevent the injection needle (32) from bending during the sampling process; A trimming assembly (37) is arranged on the top of the sample placing plate (31), and the trimming assembly (37) is used to cut and trim the rubber tube of the needle tip part of the injection needle (32). The trimming assembly (37) includes an air storage portion (3701) and a trimming groove (3702). The air storage portion (3701) is fixedly arranged inside the lifting groove (3301), and the air storage portion (3701) is located below the lifting frame (3302). The trimming groove (3702) is opened on the top of the sample placing plate (31). The sample placing plate (31) is symmetrically provided with two first air cavities (3703) located at the bottom periphery of the trimming groove (3702). The interior of each of the first air cavities (3703) is sealed and slidably provided with a first piston plate (3704). Each of the first air cavities (3703) is provided with a first piston plate (3704) in a sealing and sliding manner. A first piston rod (3705) is fixedly provided on one side of the plug plate (3704) and extends into the trimming groove (3702); an extrusion plate (3706) located inside the trimming groove (3702) is fixedly provided at one end of each of the first piston rods (3705); a return spring (3707) is fixedly provided between the other side of each of the first piston plates (3704) and the corresponding first air cavity (3703); a first air dividing ring (3708) located on the outer periphery of the two first air cavities (3703) is provided inside the sample plate (31); each of the first air cavities (3703) is connected to the first air dividing ring (3708); and a first air duct (3709) is provided between the first air dividing ring (3708) and the air storage portion (3701).

2. A micro-spectrophotometer according to claim 1, characterized in that: The trimming assembly (37) further comprises a support plate (3710) slidably arranged inside the trimming groove (3702); a plurality of sliding cavities (3711) are evenly arranged inside the sample plate (31) and are located on the outer periphery of the top of the trimming groove (3702); a plurality of sliding plates (3712) that can slide in corresponding side sliding cavities (3711) are fixedly arranged on the outer periphery of the support plate (3710); an elastic air bag (3713) is fixedly arranged at the bottom of each of the sliding cavities (3711); a second air dividing ring (3714) located on the outer periphery of the plurality of sliding cavities (3711) is arranged inside the sample plate (31); each of the elastic air bags (3713) is connected to the second air dividing ring (3714); and a second air passage (3715) is arranged in communication between the first air dividing ring (3708) and the second air dividing ring (3714).

3. A micro-spectrophotometer according to claim 2, characterized in that: The trimming assembly (37) further comprises two second air chambers (3716) opened inside the sample plate (31), and the two second air chambers (3716) are symmetrically arranged on the middle periphery of the trimming groove (3702), each of the second air chambers (3716) is connected to the second air channel (3715) on the same side, and a second piston plate (3717) is sealed and slidably arranged inside each of the second air chambers (3716), and a second piston rod (3718) penetrating into the trimming groove (3702) is fixedly arranged on one side of each of the second piston plates (3717), a cutting blade (3719) located inside the trimming groove (3702) is fixedly arranged on one end of the second piston rod (3718) on one side, and a cushion block (3720) located inside the trimming groove (3702) is fixedly arranged on one end of the second piston rod (3718) on the other side, and a return spring (3721) is sleeved on each of the second piston rods (3718).

4. A micro-spectrophotometer according to claim 3, characterized in that: The elastic coefficient of the return tension spring (3707) is smaller than the elastic coefficient of the elastic airbag (3713), and the elastic coefficient of the elastic airbag (3713) is smaller than the elastic coefficient of the return spring (3721).

5. A micro-spectrophotometer according to claim 1, characterized in that: A slot (3605) is provided on each of the limiting sleeve rods (3601), a block (3606) is fixedly provided on each of the limiting rods (3602), and each of the block (3606) is slidably provided in the corresponding slot (3605).

6. A detection method of a micro-spectrophotometer, applied to a micro-spectrophotometer according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, sample preparation, diluting the liquid sample to be tested, grinding the solid sample to be tested and then dissolving and diluting it, and placing the prepared sample to be tested in a sample placement tray (31); Step 2: Instrument calibration: use standard samples to calibrate the instrument; Step 3: parameter adjustment: adjusting the light source chamber (1), atomizer (2), automatic sample injector (3) and detector according to the measurement requirements; Step 4: Data collection: testing the samples to be tested and recording the test data; Step 5: Data analysis: Use the instrument's data processing software to process and analyze the recorded test data and obtain the corresponding test results.

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