CN212363860U - Multi-channel full-automatic nitrogen blowing instrument - Google Patents

Abstract

A multi-channel full-automatic nitrogen blowing instrument belongs to the field of laboratory instruments. The water bath has a plurality ofly, a plurality of water bath sets up at the carousel periphery uniformly, be provided with the test-tube rack on the water bath, be provided with the support frame that sweeps on the test-tube rack, used water and gas are sent to the water-distribution pipe respectively and are swept the needle through heating portion heating, water bath tank limit is provided with the photoelectric detection device of the sample solution liquid level in the test tube, water bath inboard intercommunication is provided with the subsidiary basin, be connected with respective elevating gear on test-tube rack and the subsidiary basin respectively, elevating gear, sample liquid level photoelectric detection device, the circulating pump is connected with the controller electricity respectively, utilize this instrument, can accelerate solution evaporation rate, improve and sweep efficiency, thereby can obtain experiment precision under the equal condition, reduce the error, improve the rate of recovery and the analytical accuracy nature to the sample.

Description

Multi-channel full-automatic nitrogen blowing instrument

Technical Field

The utility model relates to a nitrogen blows appearance, in particular to full-automatic nitrogen of multichannel blows appearance belongs to laboratory instrument field.

Background

The nitrogen blowing instrument is a short name of a nitrogen blowing instrument (Termovap Sample Concentrator), and is also called as follows: nitrogen enrichment facility, nitrogen sweep appearance, nitrogen sweep concentrator, sample concentrator, also known as nitrogen sweep appearance, concentrator.

Usually, nitrogen or air is blown into the surface of the heated sample to concentrate the sample, which has the characteristics of time saving, convenient operation, easy control and the like, and can quickly obtain the concentration result.

The method is widely applied to the industries of quality inspection of agricultural and livestock products, pesticide residue analysis, commercial inspection, food, environment, pharmacy, biological products and the like, provides a time-saving and efficient platform for preparation and treatment of samples in analysis means such as Gas Chromatography (GC), gas Mass Spectrometry (MS), liquid chromatography (HPLC), liquid mass spectrometry (LC-MS) and the like, and is the best matched equipment for the solid-phase extraction technology.

In an analysis experiment, the nitrogen blowing instrument mainly increases the concentration of components by reducing the solvent or moisture in a sample solution, so that a sample for determination reaches the concentration which can be detected by the instrument, the effect of rapid separation and purification is achieved, and the aim of final sample feeding detection on a machine is fulfilled.

The traditional nitrogen blowing instrument is characterized in that a test tube filled with solution is fixedly arranged on a heater (water bath or metal bath), a solvent in the sample solution in the test tube is respectively blown and swept by lifting the blowing needle above the test tube and penetrating into the test tube, a plurality of samples are processed at one time, and the traditional nitrogen blowing instrument is widely applied to batch repeated tests of multiple samples and multiple factors.

In the purging process, the flow of the purging gas can be respectively controlled, the height of the purging needle is integrally set through an operation panel of the controller, and the heating temperature can also realize controllable instrument conditions for heating the liquid in the test tube by controlling the temperature.

The traditional nitrogen blowing instrument has a simple structure, but has the following problems:

1. the traditional water bath type nitrogen blowing instrument has the defects of extensive energy consumption and low efficiency, and has the defects of large amount of heating water, long time for stabilizing the water temperature to reach the experimental temperature, time consumption and power consumption; the physical characteristics of water cause the temperature difference in surface liquid of still water, so that the instrument conditions required by experiments are difficult to accurately reach during heating;

2. the traditional metal bath type dry nitrogen blowing instrument has thermal resistance difference due to the physical characteristics of a heating plate, all parts of a metal block are difficult to be uniform in temperature, liquid temperature among test tubes is different when the test tubes are placed on the metal heating block, evaporation rates are different when samples are blown, so that the test tubes in the same experiment have instrument condition difference, experiment errors are increased, and experiment reliability is reduced;

3. the traditional full-automatic nitrogen blowing instrument adopts the time rate descending blowing needle, cannot automatically judge the distance between the blowing needle and the liquid level in the test tube and the blowing needle in real time, and is easy to cause the experimental accident that the blowing needle is inserted into liquid; or the purging efficiency is reduced due to the fact that the purging needle is too far away from the liquid level, so that the experiment time is prolonged, the recovery rate of the target detection object is reduced, and the experiment effect is influenced;

4. the traditional nitrogen blowing instrument does not heat the blowing gas, the temperature difference exists between the blowing gas and the experimental solution, the gas flow of the blowing gas can directly influence the temperature of the experimental process to be blown, the experimental conditions are not strictly followed, and therefore the accuracy and authority of the experiment are influenced;

5. the traditional nitrogen blowing instrument cannot identify the blowing end point, excessive blowing after the blowing end point is easy to occur, and the loss of experimental target components is caused to reduce the experimental accuracy; the situation that the automation degree of a laboratory is improved due to the fact that experiential experiment operators and more human interventions are needed when the situation is avoided;

recently, a carousel formula nitrogen blows appearance has appeared in the market, sweeps each test tube respectively through rotatory carousel, but still has to sweep the needle and can't hold apart from the height of liquid, directly heats the basin and can arouse the phenomenon that the temperature is different in the basin, and it is low to sweep gaseous temperature, and liquid concentration speed is slower, experimental conditions do not abide by strictly the shortcoming such as.

Disclosure of Invention

When sweeping to present nitrogen blowing appearance, sweep the needle and highly be difficult to accurate control from sample solution in the test tube, lead to solution evaporation rate to differ, can not strictly comply with the problem that experimental objective and reliability were reached under the experiment requirement condition, the utility model provides a full-automatic nitrogen blowing appearance of multichannel, its purpose sweeps the liquid level through detecting test tube interior solution, sweep the height of needle through lift test tube height control sample liquid distance, through accurate heating water bath liquid and gas, make the test process follow the experiment requirement more strictly to can further accelerate solution evaporation rate, improve and sweep efficiency, thereby can obtain the experimental accuracy under the equivalent condition, reduce error and uncertainty improve the rate of recovery and the analytical accuracy nature and the reliability of whole experimentation to the sample.

The technical scheme of the utility model is that: a multi-channel full-automatic nitrogen blowing instrument comprises a collecting pipe, a circulating pump, a rotary table and an air supply pipe, wherein a plurality of blowing needles are arranged at the end part of the air supply pipe and respectively extend into the upper parts of sample solutions in a plurality of test tubes, the test tubes are arranged in water bath tanks, test tube racks and blowing needle fixing plates are arranged above the water bath tanks, a ventilation cabinet is arranged above the rotary table, a plurality of water bath tanks are respectively arranged at the periphery of the rotary table at the same intervals, lifting type test tube racks and overturning type blowing support frames are arranged above the water bath tanks, water distribution pipes are arranged in the water bath tanks, the air supply pipe and the air supply pipe which are connected with the circulating pump and the gas collecting pipe are respectively sent to the water distribution pipes and the blowing needles through heating water or heating air, photoelectric detection devices for detecting the liquid level of the sample solutions in the test tubes are arranged at the edges of the water bath tanks, the test tube rack and the auxiliary water tank are respectively connected with a lifting device, a blowing needle fixing plate is hung on the blowing needle rack above the turnover blowing support frame, and the lifting device, the sample liquid level photoelectric detection device and the circulating pump are respectively and electrically connected with the controller;

furthermore, a flowmeter, a gas flow control valve or a one-way flow control valve are respectively arranged on the gas supply pipe and the water supply pipe, a plurality of branch pipe joints connected with the purging needle are arranged on the purging needle fixing plate, automatic miniature gas flow control valves and manual control valves are respectively arranged on a plurality of branch pipes, and the automatic miniature gas flow control valves, the flowmeter and the one-way flow control valves are respectively electrically connected with the controller;

furthermore, a liquid level meter and a temperature sensor are arranged in the water bath tank, the liquid level meter and the temperature sensor are respectively electrically connected with the controller, the water bath tank is communicated with the auxiliary water tank through a heater and a one-way control valve, a drain pipe and a one-way valve are arranged at the bottom of the water bath tank, a water distribution pipe in the water bath tank is horizontally or vertically arranged, a plurality of water distribution holes or water distribution gaps are formed in the periphery of the water distribution pipe, the horizontally arranged water distribution pipe is arranged at the edge of the water area pool in the same length direction with the water bath pool, the plurality of water distribution holes or water distribution gaps are horizontally arranged and face the opposite side of the water tank, the vertically arranged water distribution pipe is arranged at the central part of the water bath pool;

the photoelectric detection device for the liquid level of the sample solution in the test tube arranged on the edge of the water bath comprises one or more groups of light sources and light receiving parts, each group of light sources is at least provided with three beams of detection light which are vertically arranged, the three beams of detection light alternately emit light or adopt respectively identifiable codes to simultaneously modulate and emit light, the distance between the light sources of the three beams of detection light is adjustable, and the water bath is transparent at least at the position irradiated by the three beams of detection light;

furthermore, the water supply pipe and the air supply pipe are provided with heating parts, each heating part comprises a heater, the heaters, the air supply pipe and the water supply pipe are in linear structures or/and spiral structures, the heaters, the air supply pipe and the water supply pipe are combined and arranged among the inner layer, the middle layer and the outer layer at will, the air supply pipe and the water supply pipe are consistent in air flow and water flow directions, water temperature sensors are respectively arranged at the water inlet end and the water outlet end of each heating part, and the two water temperature sensors are connected with the controller;

furthermore, four lead screws are arranged below the lifting type test tube rack, a first turbine elevator is respectively in threaded connection with the lower portions of the left and right opposite lead screws, the two lead screws are located on the left and right sides of the water bath, differential half shafts are respectively connected to input shafts of the first turbine elevators, the input end of the differential is connected with a lifting motor through a speed reducer, a right-angle turnover hinge which can be horizontally and vertically turned over is arranged between the test tube rack and the purging support frame, the turning direction faces the circle center direction of the rotary table, a pair of vertically downward hanging rods are hung below a cross rod of the purging rack, a purging needle fixing plate is arranged between the pair of hanging rods in a sliding manner, a rotating joint is arranged between the hanging rods and the purging needle fixing plate, a gas distributor and a plurality of purging needle fixing joints are arranged;

further, the lifting device comprises a micro stepping motor or a micro servo motor, and the micro stepping motor or the micro servo motor is connected to the test tube rack and the auxiliary water tank through a transmission mechanism;

furthermore, the water supply pipe is connected between the water bath and the heating part, a circulating pump and a one-way control valve are arranged in the water supply pipe, the water supply pipe is communicated with two water distribution pipes in the water bath, the water distribution pipes are arranged in opposite directions of the long side of the water bath, a multi-channel rotary joint is connected to the air supply pipe, an outlet of the multi-channel rotary joint is communicated with each purging frame, a gas distributor is arranged between the multi-channel rotary joint and is distributed to each purging needle by the distributor, a manual valve is arranged on each air supply branch pipe, a conductive slip ring is adopted for electric connection between the upper part and the lower part of the;

further, the three detection light sources are arranged on a lead screw with opposite rotation directions, a micro stepping motor or a micro servo motor is connected to the lead screw, and the micro stepping motor or the micro servo motor is connected with the controller;

further, the heater of the heating part is a high-frequency heater, a pulse heater, a power frequency or direct current heater.

The utility model has the positive effects that the plurality of water bath tanks are arranged on the periphery of the turntable according to the same indexing position, so that different instrument conditions can be swept and concentrated on different batches of sample test tube solutions at the same time, and the solutions do not affect each other;

the photoelectric detection device for the liquid level of the sample solution in the test tube is arranged on the inner side or the outer side of the water bath around the turntable, the detection height can be fed back to the controller, the controller sends out an instruction to drive the test tube rack to move according to the set distance between the liquid and the purging needle, so that the set distance is always kept between the purging needle and the liquid level, the purging conditions in a plurality of test tubes can be ensured to be consistent, the evaluation accuracy is improved, and particularly, different heights of the arc-shaped water surface formed by purging in the test tube in the purging process can be detected by arranging three beams of detection light;

by setting a photoelectric intensity control program, the photoelectric detection device is always in the most sensitive state, so that the detection sensitivity and reliability of the instrument are improved;

by arranging the heating part and simultaneously heating the water in the water supply pipe and the gas in the gas supply pipe by using the heating part, the evaporation speed of the liquid can be improved, the concentration speed of the sample liquid is promoted, and the evaluation efficiency is improved;

three beams of detection light are vertically arranged, the three beams of detection light adopt one or more methods of alternate light emission, different colors or phases, or respectively identifiable code modulation and simultaneous light emission, the distance between the three beams of detection light sources is adjustable, the heights of different heights of a sample solution with a concave shape in the purging process can be detected, the three beams of detection light emit light according to different coding methods, misdetection caused by interference between light rays can be prevented, the adjustable distance between the three beams of detection light sources can meet the detection of the liquid surface in a test tube under different gas flow rates, particularly the situation that the concave shape of the sample solution is enlarged and is difficult to detect under the atmosphere gas flow rate can be prevented, and the accuracy of concave shape detection can be realized by enlarging the distance between the three beams of detection light sources under the situation;

the water level height and the temperature height can be respectively detected by arranging a liquid level meter and a temperature sensor in the water bath, the water level can be adjusted to the height by the auxiliary water tank, the temperature can be adjusted by controlling the power of a heater by a controller, the height of the auxiliary water tank can also be adjusted by lifting, so that the height of the water level in the water bath can be adjusted, when the liquid level meter detects that the water level in the water bath is raised to be higher than a set upper limit, the auxiliary water tank can be lowered, redundant water flows into the auxiliary water tank, and when the water in the water tank is lower than a lower limit water level, the water level in the water bath can be raised by lifting the auxiliary water tank, so that the;

the water distribution tank can rapidly circulate under the action of a circulating pump through horizontal water distribution gaps or a plurality of horizontally arranged water distribution holes arranged in the length direction of a water distribution pipe in the water tank, so that the temperature of the water tank can be uniform in a short time, the temperature difference of water in the water tank is reduced, the heating temperature difference of different test tubes can be reduced, the consistency of the heating temperature is ensured, and the consistency of the concentration condition of a sample solution is further ensured;

the heating part heats gas and water simultaneously, so that liquid and gas can be heated in an allowable heating range, the evaporation speed of the sample solution is increased, the concentration speed can be increased, the working efficiency is improved, and particularly, a water pipe, an air pipe and a heater are made into a spiral structure, so that centralized heating can be realized, and the heating efficiency is improved;

the gas flow control valve or the one-way flow control valve and the flowmeter are arranged in the water supply pipe or the gas supply pipe, so that the accuracy of water supply or gas supply can be improved, and the flow can be controlled through the circulating pump, the one-way flow control valve or the gas flow control valve according to the feedback information of the flowmeter arranged in the water path and the gas path to the controller;

the lifting type test tube rack is arranged above the water bath tank, the distance between the purging needle and the liquid level in the test tube can be adjusted through the lifting test tube rack according to the detection result of the photoelectric detection device, and the overturning type purging support frame is arranged on the lifting type test tube rack, so that the purging support frame can be turned to one side of the circle center of the rotary table, and corresponding debugging or operation can be performed on the water bath tank and the lifting type test tube rack;

the blowing needle is connected to the lower part of the fixed joint, so that the blowing needle is favorably adjusted in height or lifted out of a test tube (the test tube can be separated from the blowing needle by lifting the test tube rack), the rotating joint is favorably utilized to rotate the blowing frame and the blowing needle, and the operation from the opening part of the test tube is favorably realized;

the utility model controls the height of the sample liquid from the blowing needle by detecting the blowing liquid level of the solution in the test tube and lifting the test tube, by precisely heating the water bath liquid and the gas, the test process more strictly follows the test requirements, the evaporation speed of the solution can be further increased, the purging efficiency is improved, thereby obtaining the experimental precision under the same condition, reducing the error and the uncertainty, improving the recovery rate and the analysis accuracy of the sample and the reliability of the whole experimental process, creating conditions for accurate detection, being capable of accurately evaluating the detection result, providing high-value evaluation conclusion for agricultural production, food safety, drug evaluation and the like, thereby ensuring pesticide residue, food and beverage safety and drug use safety, preventing unsafe products from entering daily life, and creating favorable conditions for preventing citizens from panic and stabilizing society.

Drawings

Fig. 1 is a schematic top view of a turntable.

Fig. 2 is an enlarged schematic view of the surface of the water bath.

Fig. 3 is a schematic sectional view along the direction of the turntable a-a 1.

Fig. 4 is a schematic front structural view among the water bath, the test tube rack and the blowing rack.

FIG. 5 is a schematic view of the structure of the coil inside the heating part.

Fig. 6 is a schematic view of a height adjustment structure of three detection light sources.

Fig. 7 is a schematic side view of a right-angle flip hinge.

Fig. 8 is a schematic view of the structure of the turned side of a right angle type of turning leaflet.

FIG. 9 is a schematic diagram of the gas supply circuit.

Fig. 10 is a schematic view showing a water path connection between the water bath, the auxiliary water tank, and the heating unit.

FIG. 11 is a schematic view showing the state of the liquid level in the test tube.

Fig. 12 is a schematic diagram of the structure of the controller and the connections between the various components.

The reference number indicates that 10-rotating disc, 11-rotating shaft, 12-electric wire, 12 a-conductive slip ring, 13-air supply pipe, 13 a-multichannel rotating joint, 13 b-air distributor, 13 c-branch air pipe, 14-water supply pipe, 15-water bath, 16-auxiliary water tank, 17-test tube rack, 18-test tube clamp, 18 a-test tube clamp rotating shaft, 19-photoelectric detection device, 20-purging rack, 20 a-rotating joint, 20 b-suspension rod, 21-purging support rack, 22-right-angle turnover hinge, 23-fixed joint, 25-test tube rack screw, 25 a-turbine elevator I, 26-water distribution pipe, 27 a-water temperature sensor I, 27 b-water temperature sensor II, 28-half shaft, half shaft, 29-differential mechanism, 30-base, 31-auxiliary water tank lifting motor, 32-turbine lifting motor II, 33-screw rod rotating shaft outer sleeve, 34-controller, 35-heating part, 36-test tube rack lifting motor, 38-forward and reverse screw rod, 38 a-forward screw rod, 38 b-reverse screw rod, 38 c-forward screw rod nut, 38 d-reverse screw rod nut, 39-detector motor, 39 a-lifting gear I, lifting gear II 39b, 40 a-upper detector, 40 b-middle detector, 40 c-lower detector, 41-light-receiving mirror, 42-air coil pipe, 43-high-frequency heating pipe, 44-crude water pipe, 45-groove type base, 46-turnover groove type upright column, 47-locking pin, 48-arc hole, 49-turnover rotating shaft, 50-spring, 51-purging gas source, 52-collecting pipe, 53-gas quick head, 54-gas flow control valve, 55-manual control valve, 56-locking screw, 57-lifting sleeve, 58-purging needle fixing plate, 59-purging needle, 60-test tube, 61-water tank hoop, 62-circulating pump and 63-one-way flow control valve.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

The technical scheme of the utility model is a full-automatic nitrogen of multichannel blows appearance, and figure 1 is the overlooking structure schematic diagram of carousel.

Fig. 2 is an enlarged schematic view of the surface of the water bath, fig. 3 is a schematic view of a sectional structure along the direction of a turntable a-a1, and fig. 4 is a schematic view of a front structure among the water bath, the test tube rack and the purge rack. The multi-channel full-automatic nitrogen blowing instrument comprises a gas collecting pipe 52, a circulating pump 62, a rotary table 10 and a gas supply pipe 13, wherein the terminal part of the gas supply pipe 13 is connected with a plurality of blowing needles 59, the blowing needles 59 extend into the upper parts of sample solutions in a plurality of test tubes 60 respectively, the test tubes 60 are arranged in a water bath 15, a test tube rack 17 comprising a blowing needle fixing plate 58 is arranged above the water bath 15, the lower part of the test tube rack 17 is rotatably connected with the end part of a test tube rack lead screw 25 of a turbine lifter 25a, 36 is a test tube rack lifting motor, a ventilation cabinet is arranged above the rotary table 10, the water bath 15 is provided with a plurality of water bath grooves 15, the water bath grooves 15 are arranged at the periphery of the rotary table 10 respectively according to the same interval or graduation, a lifting type test tube rack 17 is arranged above the water bath groove 15, an overturning type blowing supporting frame 21 is arranged on the lifting type test tube rack 17, a water distribution pipe 26 is arranged in the water bath groove 15, and 35 are respectively sent to a water distribution pipe 26 and a blowing needle 59, a photoelectric detection device 19 for detecting the liquid level of the sample solution in the test tube 60 is arranged at the periphery of the water bath 15, an auxiliary water tank 16 is arranged at the radial direction of the water bath 15 close to the center side of the turntable and is in soft communication with each other through a heating part 35 and a one-way flow control valve 63, the test tube rack 17 and the auxiliary water tank 16 are respectively connected with respective lifting devices, the two devices respectively utilize a first turbine lifter 25a and a second turbine lifter 32 driven by a stepping motor to lift, wherein, 25 is a test tube rack screw, 33 is a screw rotating shaft outer sleeve arranged at the bottom of the auxiliary water tank 16, 31 is an auxiliary water tank lifting motor, the sweeping rack 20 is arranged above the overturning sweeping support frame 21, the liftable sweeping needle fixing plate 58 is hung below the sweeping rack 20, and the lifting device, the photoelectric detection device 19 of the sample liquid level and the circulating pump 62 are respectively and electrically connected with the controller 34.

In this embodiment, the water that a plurality of nitrogen blown appearance that carousel 10 changes set up, electricity, gas all utilize respective quick-operation joint to connect, according to the in service behavior, every nitrogen blown appearance all can be pulled down alone, connect the water, electricity, can the exclusive use behind the gas, because be provided with round platform form bearing between pivot 11 and the carousel 10, but the carousel rotates under the manual mode on carousel 10 is blown to the nitrogen blown appearance setting, when needing to operate the nitrogen blown appearance on one of them passageway, can rotate this nitrogen blown appearance to operation face one side, carry out corresponding operation or dismouting.

The water bath edge is provided with a water tank hoop 61, the water tank hoop 61 comprises a horizontal part, and the horizontal part of the water tank hoop 61 is arranged on a gap formed at the periphery of the turntable at intervals and is fixed by screws.

The utility model discloses a water bath 15, including water bath 15, be provided with the level gauge in the water bath 15, temperature sensor, the level gauge, temperature sensor are connected with controller 34 electricity respectively, through heating portion 35 and one-way flow control valve 63 flexible connection and intercommunication between water bath 15 and the subsidiary basin 16, be provided with the drain pipe at the bottom of water bath 15, be provided with the drainage check valve on the drain pipe, the drain pipe communicates with water bath 15, delivery pipe water distributor 26 intercommunication, delivery pipe and water bath 15 interior water distribution pipe 26 is sent to arbitrary one side of two minor faces in water bath, a plurality of water distribution holes or water distribution gap have been seted up to water distributor 26 periphery, water distributor 26 has following two kinds of setting mode: horizontal arrangement mode and vertical arrangement mode

The first method comprises the following steps: the horizontal setting mode: the two water distribution pipes 26 in the water bath 15 are arranged horizontally, the two horizontally arranged water distribution pipes 26 are arranged on the long edge part of the water bath in the same length direction with the water bath 15, and a plurality of water distribution holes or water distribution gaps are arranged horizontally and face the other long edge. Shown in fig. 2 are horizontally disposed water distribution pipes 26;

and the second method comprises the following steps: the vertical setting mode is as follows: the vertically arranged water distribution pipes 26 are arranged at the central part of the water bath 15, a plurality of water distribution holes or water distribution gaps face to the periphery, and test tubes are uniformly arranged at the periphery of the water distribution pipes 26.

Fig. 6 is a schematic diagram of a three-beam detection light source height adjustment structure. The water bath 15 is provided with a photoelectric detection device 19 for detecting the level of the sample solution in the test tube 60 at the side, in the embodiment, the photoelectric detection device 19 is arranged at the peripheral operation side of the water bath 15, the photoelectric detection device 19 comprises one or more groups of light sources and light receiving parts, each group of light sources is provided with at least three detection light beams, the three detection light beams are vertically arranged, during detection, the three detection light beams alternately emit light or respectively identify codes and simultaneously modulate and emit light, the distance between the three detection light beams is adjustable, the water bath 15 is transparent at least at the irradiation part of the three detection light beams, a light receiving lens 41 is arranged opposite to the water bath opposite to the three detection light beams, the light receiving lens 41 is connected with the controller 34,

the above-mentioned coded simultaneous modulation luminescence methods identified respectively are the existing signal processing techniques, and specifically there are the following;

1. setting different optical filters or polaroids at the detection position according to the color or phase difference;

2. the alternate light emission can detect detection bit signals respectively according to different time sequences;

3. modulated light and ambient light irradiate on the detector, analog electric signals related to the light intensity are generated, corresponding optical modulation signals can be demodulated by adopting a corresponding decoding mode, and the encoding and decoding mode is not limited to frequency superposition, time sequence superposition and other modes;

the photoelectric detection device 19 can also be arranged on the inner side of the water bath 15, if the photoelectric detection device is arranged in the water bath 15, a waterproof device is required to be arranged on the periphery of the photoelectric detection device 19, and the optical detector in the solution is more sensitive because the refraction of different media is reduced.

In this embodiment, the method for adjusting the distance between the three detection light sources is to fix the middle detector 40b, fix the forward rotation screw nut 38c and the reverse rotation screw nut 38d to the upper detector 40a and the lower detector 40c, and thread-connect the forward rotation screw 38a part and the reverse rotation screw 38b in two opposite directions to the forward rotation screw nut 38c and the reverse rotation screw nut 38d, respectively, the forward rotation screw 38a part and the reverse rotation screw 38b are set on the same forward and reverse rotation screw 38, the forward and reverse rotation screw 38 is connected to the detector motor 39 through the first lifting gear 39a and the second lifting gear 39b, and the detector motor 39 is a speed-reducing stepping motor with a speed reducer.

The heating part 35 comprises a heater, the heating air pipe, the heating water pipe is of a linear structure or/and a spiral structure, the heater, the heating air pipe, the heating water pipe is arranged on the inner layer, the middle layer and the outer layer in a combined mode at will, the heating air pipe is consistent with the direction of air flow and water flow in the heating water pipe, a heat insulation layer is arranged on the periphery of the heating part 35, heated water and gas extend to the upper portion of the rotary table 10 from the periphery of the water bath 15 through the water supply pipe 14 and the air supply pipe 13 and are respectively sent to the water distribution pipe 26 and the purging needle 59, and rib-shaped turbulence structures (if the heating part is bent more, the rib-shaped turbulence structures can not be arranged) for.

Fig. 5 is a schematic view of the coil structure inside the heating section 35. In this embodiment, the water pipe is a linear thick water pipe 44, the heating air pipe and the heater are both spiral coils with different spiral diameters and are arranged in the thick water pipe 44, in order to improve the heating effect on water and gas, the high-frequency heating pipe 43 coil and the air coil 42 are arranged in the thick water pipe 44, the air coil 42 and the high-frequency heating pipe 43 coil are respectively arranged in the inner ring and the middle, the high-frequency heating pipe 43 coil is firstly used for heating water, and then the hot water is used for heating gas. The thick water pipe 44, the air coil pipe 42, and the high-frequency heating pipe 43 are respectively provided with respective temperature sensors, and the plurality of temperature sensors are electrically connected to the controller 34 and feed back respective temperatures to the controller. In this embodiment, two high-frequency heating pipes are provided, which are a main high-frequency heating pipe and an auxiliary high-frequency heating pipe, respectively, the heating power of the auxiliary high-frequency heating pipe is smaller than that of the main high-frequency heating pipe, and the auxiliary high-frequency heating pipe is used for temperature fine adjustment of the heater.

The lift type test-tube rack below is provided with four test-tube rack lead screws 25, relative about on the test-tube rack lead screw 25 respectively threaded connection have respective turbine lift 25a, two test-tube rack lead screws 25 pass water bath left and right sides basin hoop 61 horizontal part respectively and rotate and connect the test-tube rack bottom, be connected with two semi-axles 28 of differential mechanism 29 on controlling two turbine lift 25 a's the input shaft, differential mechanism 29 input passes through the speed reducer and is connected with test-tube rack elevator motor 36, two test-tube rack elevator motor 36 are by controller 34 synchro control around the differential mechanism.

A right-angle turnover hinge 22 which turns horizontally and vertically is arranged at the connecting part between the upper surface of the test tube rack 17 and the purging support frame 21, the turnover direction faces the direction of the circle center of the rotary table 10, a pair of vertically downward hanging rods 20b are hung below the cross rod of the purging frame 20, a purging needle fixing plate 58 is arranged between the pair of hanging rods 20b in a sliding manner, a rotating joint 20a is arranged between the hanging rods 20b and the purging needle fixing plate 58, a gas distributor 13b and a plurality of fixing joints 23 are arranged on the purging needle fixing plate 58, the fixing joints 23 are fixed on the purging needle fixing plate 58, a purging needle 59 is connected and plugged below the fixing joints 23, a plurality of branch gas pipes 13c are connected and plugged in the fixing joints 23, a plurality of branch gas pipes 13c are led out from the gas distributor 13b, the plurality of branch gas pipes 13c are respectively connected above the fixing joints 23, a lifting sleeve 57, the two lifting sleeves 57 are respectively fixedly connected with two ends of the blowing needle fixing plate 58, when the test tube 60 is arranged on the test tube rack 17, the blowing needle fixing plate 58 is lifted along the hanging rod 20b by loosening the locking screw 56, the blowing needle fixing plate 58 and the blowing needle 59 can also be rotated through the rotating joint 20a, particularly, after the blowing support frame 21 and the blowing frame 20 are laid down by using the right-angle turnover hinge 22, the blowing needle fixing plate 58 can be rotated, and the groove-shaped base 45 and the turnover groove-shaped upright column 46 are buckled and fixed. In this embodiment, three test tubes, a purge needle 59, and a bronchus 13c are provided.

The test tube rack 17 is hinged with a plurality of test tube clamps 18 through test tube clamp rotating shafts 18a, and the test tube clamp rotating shafts 18a are provided with clamping springs for clamping the test tubes 60.

In the present embodiment, the structure of the right-angle flip hinge 22 is illustrated in fig. 7, which is a schematic side view of the right-angle flip hinge 22, and fig. 8, which is a schematic side view of the right-angle flip hinge 22.

The blowing and sweeping support frame is characterized in that the turning groove-shaped upright column 45 is a groove-shaped base, the turning groove-shaped upright column 46 is connected with the turning groove-shaped upright column in a rotating mode, the blowing and sweeping support frame 21 is fixed on the turning groove-shaped upright column 46 and is connected with the turning groove-shaped upright column in a rotating mode through a turning rotating shaft 49, a locking pin 47 is arranged on the turning groove-shaped upright column 46, the locking pin 47 rotates along an arc hole 48 when the horizontal state and the vertical state are switched, a spring 50 is arranged on the turning rotating shaft 49, the blowing and sweeping support frame 21 can be kept in the vertical state through the spring 50, a locking buckle is arranged between the groove-shaped base 45 and the turning groove-shaped upright column 46, and.

Of course, fig. 7 illustrates one prior art example of this type, and various types of hinges 22 that can be turned at right angles can be used.

The lifting device comprises a micro stepping motor or a micro servo motor, the micro stepping motor or the micro servo motor is connected to the test tube rack 17 and the auxiliary water tank 16 through a transmission mechanism, the three light sources of the detection light are arranged on a lead screw with opposite rotation directions, the lead screw is connected with the micro stepping motor or the micro servo motor, and the micro stepping motor or the micro servo motor is connected with the controller 34.

In the present embodiment, a micro stepping motor is used.

Fig. 9 is a schematic diagram of the gas supply line. The gas generated by the purge gas source 51 is divided into a plurality of paths of gas by a manifold 52 and is respectively fed to the rotating shaft 11, the rotating shaft 11 is provided with a multi-channel rotary joint 13a, the manifold 52 is divided into a plurality of paths of gas and is respectively fed into the multi-channel rotary joint 13a, the multi-channel rotary joint 13a is respectively fed to the heating parts 35 of the nitrogen blowers for heating, for dismounting, a gas quick head 53 and a gas flow control valve 54 are respectively arranged on a gas supply pipeline, the gas is also fed to a gas distributor 13b with the same water channel, a manual control valve 55 is arranged on the gas distributor 13b, and then the gas is divided into a plurality of branch gas pipes 13c from the gas distributor 13b and is respectively fed to the purge.

The gas manifold 52 and the gas distributor 13b described above are prior art gas manifold vessels or gas manifold tubes having one or more inlets and one or more outlets in the vessel or tube.

In the present embodiment, the heating unit is provided below the water bath 15, and the controller 34 is provided below the heating unit 35, and the heating unit 35 and the controller 34 are isolated from each other by a heat insulating material, but the positions of the controller 34 of the heating unit 35 may be changed. A circulating pump 62 is arranged beside the controller 34, gas is from a purge gas source 51 which is additionally arranged, the purge gas source 51 is connected to the gas header 52, the controller 34 and the circulating pump 62 are isolated from each other, and the controller 34 takes waterproof measures.

In the present embodiment, the controller 34 is selected from the controllers of siemens germany.

Fig. 10 is a schematic view of the water path connection between the water bath, the auxiliary water tank, and the heating unit. A water supply pipe 14 is arranged between the water bath 15 and the heater 35, a part of the water supply pipe 14 is a hose or a connecting mechanism suitable for lifting of the auxiliary water tank 16, a circulating pump 62 is arranged on the water supply pipe 14, water is added into the water bath 15 before use and is heated by the heating part 35, a water temperature sensor I27 a and a water temperature sensor II 27b are respectively arranged at the water inlet end and the water outlet end of the heating part, and the two water temperature sensors are connected with the controller.

In the actual temperature control, the heating power is controlled, specifically, the following manner is performed:

heating efficiency (η) = heating power (I × U)/specific heat capacity of water (cbuie) × water mass (M water) through which copper passes per unit time × temperature difference before and after heating (Δ S)

Wherein: temperature difference before and after heating (Δ S) = outlet water temperature (S2) — heating part having inlet water temperature (S1)

The heating part has an inlet water temperature S1 and an outlet water temperature S2, the water bath temperature needs to be accurately controlled, the water temperature S3 reaching the water bath 15 from the heating part is reduced, a temperature difference delta T = S3-S2 exists between the water bath temperature in the water bath 15 and the outlet of the heater, and thus a temperature difference exists between the temperature in the water bath and the set temperature S, and the lost temperature needs to be compensated for in order to realize accurate control of the water temperature.

Compensated actual power (T) = set power (ttet) + dissipated power (tsuan)/heating efficiency (η)

The actual control is performed by using the compensated actual power (T).

The heated water is sent to a water distribution pipe 26 provided in the water bath 15, and a one-way flow control valve 63 is provided in the water supply pipe, so that the water flows in a circulating manner between the water bath 15 and the heating portion 35.

The auxiliary water tank 16 adjusts the height in the water bath 15 by using the second turbine lifter 32 arranged below, during adjustment, the detection data of the liquid level meter in the water bath 15 is adjusted and fed back to the controller 34, the controller sends out instructions, and the second turbine lifter 32, the first turbine lifter 25a, the auxiliary water tank lifting motor 31 and the test tube rack lifting motor 36 lift the height of the auxiliary water tank 16 according to the instructions of the controller. An encoder can be arranged on the motor for accurate control, and the auxiliary water tank 16 can be lifted up and down by fine adjustment or adjustment of lifting amount.

A gas manifold 52 is arranged below the rotary disc 10, a plurality of paths of gas pipes at the outlet of the manifold 52 are connected to the multi-channel rotary joint 13a, each path of gas from the multi-channel rotary joint 13a is respectively sent to a heating part 35 arranged in each nitrogen blowing instrument, and is distributed to each blowing needle 59 by a branch gas pipe 13c through a one-way control valve and a gas distributor 13b, and each gas supply branch pipe is provided with a manual valve.

The power supply adopts a conductive slip ring capable of conducting electricity in the rotating process, the conductive slip ring is arranged on a rotating shaft 11 of the rotating disk 10, the power supply enters a conductive slip ring 12a from the lower part of the rotating disk 10 through the rotating shaft 11 by using an electric wire 12, then the power supply is respectively connected to devices which are not heated in the nitrogen blowing instrument through the conductive slip ring 12a, and the rotating shaft 11 is arranged on the base 30.

The conductive slip ring 12a and the multi-channel connector 13a are a multi-wire rotary connector and a multi-channel gas connector which can connect conductive wires and gas in the rotary engineering.

The heater of the heating part 35 is a high-frequency heater, a pulse heater, a power frequency or direct current heater.

A method for detecting and controlling concentrated solution of a multi-channel full-automatic nitrogen blowing instrument is characterized in that the nitrogen blowing instrument is of a rotary disc 10 structure, a plurality of channels of water bath tanks 15 are uniformly arranged on the periphery of the rotary disc 10, a plurality of test tubes 60 for detecting solution are arranged in the water bath tanks 15, a blowing needle 59 is inserted above a sample solution in each test tube 60, an auxiliary water tank 16 is radially communicated with the inner periphery of each water bath tank 15, lifting devices are respectively arranged on the water bath tanks 15 and the auxiliary water tank 16, a photoelectric detection device 19 for detecting the liquid level of the sample solution is arranged on the periphery of each water bath tank 15, the photoelectric detection device 19 comprises three light sources, the three light sources are vertically arranged, when the liquid level in the test tubes 60 is detected by the three light sources, the three light sources emit light alternately by using different colors and phases or emit light simultaneously by adopting different codes which can be distinguished, the, fig. 12 is a schematic diagram of the structure of the controller and the connections between the various components. The controller is provided with a central processing unit, a plurality of control modules are arranged on a controller circuit board, each control module is electrically connected with the corresponding control module, signal feedback and device control are respectively carried out, and finally the following detection and control are realized, wherein the detection and control steps are as follows:

1) turning on a power supply main switch, preparing a purging gas source 51, setting a nitrogen purging channel to be used and a test tube position to be purged, setting the purging temperature of an experimental instrument, the flow rate of purging gas, the type of the test tube 60, the components of a solvent, the volume of the solution and other experimental data, calling the optical characteristics of the test tube 60 and the solvent from a database, calculating the height position of a liquid level, calling a purging method approximate to the experimental data from the database, and modifying and confirming by an operator, wherein the purging method comprises the meniscus height corresponding to the liquid level of the test tube at the corresponding flow rate of purging gas, the position and the orientation of a photoelectric detector with the corresponding height of the test tube according with the optical characteristics, the flow rate close to a purging endpoint and a test tube descending function; according to the purging method, the gas electric control valve is opened to an initial corresponding position, and the three groups of light source detectors are adjusted to initial corresponding intervals by the lead screw;

if the intensity of the signal detected by the photoelectric detection device is greater than a set signal intensity threshold value, the intensity of the light source is reduced, and if the intensity of the signal detected by the photoelectric detection device is lower than the set signal intensity threshold value, the intensity of the light source is increased;

if the light source intensity reaches the limit of the adjustable part, an alarm signal is output, the environmental condition is detected or changed to meet the control requirement, and the process is controlled in real time to run through the whole experimental process;

2) activating the power supply of the target nitrogen blowing channel assembly, enabling the auxiliary water tank to rise, enabling water to sequentially flow through the circulating pump 62 and the heating part 35 according to the set flow rate, and enabling the heating program control part to start the water bath liquid heating operation according to the set program;

3) water temperature control

The water flow flows through the pump, the main heater and the auxiliary heater in sequence in a one-way mode, the water distribution pipe, the water tank 15, the water outlet and the one-way flow control valve 63, the main heater is used for heating most of power of water, one or more auxiliary heaters are used for precisely controlling the temperature of the water, the power of the main heater is determined by the temperature difference between the water temperature at the inlet of the heater and an experimental target temperature as well as the air temperature and the experimental temperature difference at the air inlet of the heater, the power of the auxiliary heater is determined by the temperature difference between the inlet of the auxiliary heater and the experimental temperature difference, and the temperature difference formed by the water temperature difference between the water temperature at the. Heater power = (water density × water flow rate × water temperature difference × water specific heat capacity + air density × air flow rate × air temperature difference + correction power)/heater efficiency

4) Purge gas temperature control

After the liquid level in the water tank rises to the experimental position and the temperature of the water bath liquid stably reaches the experimental temperature, the gas flow control valve 54 on the gas supply pipe 13 connected to the purging needle 59 is opened, and the purging needle 59 located above the sample liquid in the test tube 60 starts to perform trial purging; if the gas temperature cannot reach the experimental temperature, the speed of the circulation pump 62 is maximized, and if the circulation pump 62 flow rate is maximized,

the power of the main heater is increased, the corresponding power of the auxiliary heater is reduced, fine adjustment is kept, and the water temperature at the water outlet is kept unchanged;

5) the test tube rack 17 is positioned at the loading position, the experimental test tube 60 is firmly arranged on the test tube rack, the machine prompts that the temperature is qualified when the temperature reaches the set temperature, and an operator gives a confirmation signal after loading a signal of the test tube to be purged; according to the setting data, the test-tube rack descends to corresponding height, and the manual needle fixed plate that will blow down overturns to the position of blowing down, and the blowing begins, and the characteristics of optical detector feedback this moment are: the upper and lower optical detectors detect stable light intensity, and the middle detector detects irregular fluctuation of light intensity;

6) light source illuminance control and signal detection of the photodetection device 19

The three detection light sources emit modulated light, which may be one or more of color difference, modulation intensity according to different codes or light pulse controlled according to specific frequency time, and these signals may be demodulated into corresponding signal intensity according to corresponding codes in the detection part and avoid signal interference not conforming to these signal characteristics;

7) sample level control during purge

The initial position is adjusted, the upper, middle and lower three beams of detection light sequentially pass through the test tube 60, under normal conditions, only the middle photoelectric detection device can detect light disturbance, and the detection signals of the upper and lower photoelectric detectors are stable; when the upper photoelectric detector detects the optical disturbance, the liquid level is close to the upper position, and the test tube 60 is controlled to slowly descend; when the lower and middle photoelectric detection devices detect a light disturbance, indicating that the liquid level has fallen downward, the controller 34 controls the test tube 60 to move upward; if the upper, middle and lower photodetectors simultaneously detect the optical disturbance, which indicates that the flow of the meniscus gas is greater than the set value, the controller 34 feeds back and reduces the flow of the purge gas, records the purge gas in a purge result log and makes a corresponding prompt;

8) water level fine adjustment in purging process

FIG. 11 is a schematic view showing the state of the liquid level in the test tube. H is the position of the upper optical detector, M is the position of the middle optical detector, L is the position of the lower detector, the test tube O shows that the test tube is in a normal position in the purging process, the test tube A shows that the test tube is in a low position in the purging process, the test tube B shows that the test tube is in a high position in the purging process, and the test tube C shows that the test tube C shows a liquid level schematic diagram exceeding the normal gas flow.

Specifically, the method comprises the following steps: as described above, the edge of the water bath 15 is provided with the photodetector 19 for detecting the level of the sample solution in the cuvette 60, the photodetector 19 is disposed on the peripheral operation side of the water bath 15, the photodetector 19 is provided with at least three detecting lights arranged vertically, the three detecting lights alternately emit light during detection, the intervals between the light sources of the three detecting lights are adjustable, the water bath 15 is transparent at least at the portion irradiated with the three detecting lights,

hereinafter, a method of adjusting the liquid level in the water bath and a method of adjusting the flow rate of the purge gas with respect to the height of the test tube will be described,

referring to fig. 11, a state O shows that the liquid level in the test tube is at a normal height, the purge needle 59 needs to maintain a normal purge state, and the auxiliary water tank 16 does not need to be lifted;

the state A shows that the height of the test tube is too low, when the detection device detects the state, the height of the test tube needs to be increased, and the controller needs to adjust to the position of the state O according to the reverse prevention control of the state A;

the state B shows that the height of the test tube is too high, when the detection device detects the state, the height of the test tube needs to be reduced, at the moment, when the photoelectric detection device detects the state, a signal is fed back to the controller through the liquid level control module, the controller sends an instruction to the test tube rack lifting motor 36 through the electric component control module, and the test tube rack lifting motor 36 descends by a corresponding height until reaching the state O position;

the state C shows that the purge gas flow is too large, when the state is detected, a signal is fed back to the controller, the controller sends a command to the gas flow control module, and the gas flow control module reduces the flow of the gas flow control valve to the position of the state O through the electromagnetic valve;

in the fine adjustment process of the water level, the flow rate of the water in the circulating pump 62 is unchanged, and the water in the water bath 15 normally circulates in a one-way

A. When the liquid level meter detects that the water level in the water bath 15 is lower than the set height, the water level is fed back to the controller 34, the controller 34 instructs the lifting device of the auxiliary water tank 16 to lift, the water in the auxiliary water tank 16 passes through the circulating pump 62 and the heater through the communicating hose to the water bath 15 until the water level in the water bath 15 reaches the set height, the controller 34 instructs the auxiliary water tank 16 to stop lifting, and at the moment, the water level in the water bath 15 is consistent with the water level in the auxiliary water tank 16;

B. when the liquid level meter detects that the water level in the water bath 15 is higher than the set height, the water level is fed back to the controller 34, the controller 34 instructs the auxiliary water tank lifting motor 31 of the auxiliary water tank 16 to lower, the water in the water bath 15 flows into the auxiliary water tank 16 through the communication hose until the water level of the water bath 15 reaches the set height, the controller 34 instructs the auxiliary water tank lifting motor 31 of the auxiliary water tank 16 to stop descending, and at the moment, the water level in the water bath 15 is consistent with the water level in the auxiliary water tank 16;

9) purge proximity endpoint and endpoint detection

The liquid level in the test tube is lowered and continuously lifted along with the purging operation, when the height of the test tube meets the near end point of the purging method, the lower optical sensor cannot work normally due to the optical characteristics of the test tube, the instrument outputs a signal for alarming near the purging end point, meanwhile, the bottom optical sensor is closed to transmit and receive a part, a bottom photoelectric detector signal is not detected any more, the test tube stroke is switched to time control until the purging end point;

10) purge stop

And after the purging operation is finished, the purging gas is closed, the heater is closed, the auxiliary water tank is lowered to the minimum, after all the water bath liquid in the water bath tank flows to the auxiliary water tank, the test tube rack is lifted to the loading position at the upper part of the water bath tank, and the warning and purging are finished.

By using the apparatus and method described above, the test speed was improved compared in time with the previous examples.

The utility model can simultaneously and respectively concentrate the solution in each different batch of sample test tubes 60 under different conditions without influencing each other by arranging a plurality of water bath tanks 15 on the periphery of the turntable 10 according to the same indexing position;

the photoelectric detection device 19 for detecting the liquid level of the sample solution in the test tube 60 is arranged at the side of the water bath 15 around the turntable 10, the detected liquid level height can be fed back to the controller 34, the controller 34 sends out an instruction to drive the test tube rack 17 to move according to the set distance between the liquid and the purging needle 59, so that the purging needle 59 and the liquid level are always kept at the set distance, the purging conditions in a plurality of test tubes 60 can be ensured to be consistent, the evaluation accuracy is improved, and particularly, different heights of arc-shaped water surfaces formed by purging in the test tubes 60 in the purging process can be detected by arranging three detection light beams;

by setting a photoelectric intensity control program, the photoelectric detection device is always in the most sensitive state, so that the detection sensitivity and reliability of the instrument are improved;

by providing the heating unit 35 and heating the water in the water supply pipe 14 and the gas in the air supply pipe 13 at the same time by the heating unit 35, the evaporation rate of the liquid can be increased, the concentration rate of the sample liquid can be accelerated, and the evaluation efficiency can be improved;

the three detection light sources are vertically arranged, emit light and have adjustable intervals, so that optical disturbance generated by a sample solution with a concave shape in the surface in the purging process can be detected, the three detection light sources can prevent false detection caused by interference among light rays by methods of coding, changing wavelength and changing phase, the adjustable intervals of the three detection light sources can meet the detection of the liquid surface in the test tube 60 under different gas flow rates, particularly the situation that the concave shape of the sample solution is enlarged and is difficult to detect under the atmosphere gas flow rate can be prevented, and the accuracy of concave shape detection can be realized by enlarging the intervals of the three detection light sources under the situation;

the height of the water level and the height of the temperature can be respectively detected by arranging a liquid level meter and a temperature sensor in the water bath 15, the height of the water level can be adjusted through the auxiliary water tank 16, the temperature can be controlled through the controller 34, the temperature of the heater can be controlled through the controller, the height of the auxiliary water tank 16 can also be adjusted through lifting, so that the height of the water level in the water bath 15 can be adjusted, when the liquid level meter detects that the water level in the water bath 15 is increased to be higher than a set upper limit, the auxiliary water tank 16 can be lowered, redundant water can flow into the auxiliary water tank 16, and when the water level in the water tank is lower than a lower limit water level, the water level in the water bath 15 can;

the water can be quickly circulated under the control of the circulating pump 62 through horizontal water distribution gaps or a plurality of horizontally arranged water distribution holes arranged in the length direction of the water distribution pipes 26 in the water bath 15, so that the temperature of the water bath 15 can be uniform in a short time, the temperature difference of water in the water bath 15 is reduced, the heating temperature difference of different test tubes 60 can be reduced, the consistency of the heating temperature is ensured, and the consistency of the concentration condition of a sample solution is further ensured;

by heating the gas and the water at the heating part 35 at the same time, the liquid and the gas can be heated within an allowable heating range, so that the evaporation speed of the sample solution is increased, the concentration speed can be increased, the working efficiency is improved, and particularly, the water pipe, the air pipe and the heater are made into a spiral structure, so that the concentrated heating can be realized, and the heating efficiency is improved;

the accuracy of water supply or gas supply can be improved by arranging the one-way flow control valve 63 and the flow meter in the water supply pipe 14 or the gas supply pipe 13, and the flow can be controlled by the circulating pump 62, the air generator, the one-way flow control valve 63 or the gas flow control valve 54 according to the feedback information of the flow meter arranged in the water path and the gas path to the controller 34;

the lifting type test tube rack 17 is arranged above the water bath 15, the distance between the purging needle 59 and the liquid level in the test tube can be adjusted through the lifting type test tube rack 17 according to the detection result of the photoelectric detection device 19, the overturning type purging support frame 21 is arranged on the lifting type test tube rack 17, the purging support frame 21 can be folded to one side of the circle center of the turntable 10, and corresponding debugging or operation can be performed on the water bath 15 and the lifting type test tube rack 17;

the photoelectric detection device 19 is provided with a voltmeter and an ammeter, and adjusts the current or voltage with the controller as necessary.

The pair of vertical downward hanging rods 20b are hung below the cross rod of the support frame, the purging frame 20 is arranged between the pair of hanging rods 20b in a sliding mode, the rotating joint 20a is arranged between the hanging rods 20b and the purging frame 20, the purging frame 20 is provided with the fixed joints 23 of the purging needles 59, the purging needles 59 are connected below the fixed joints 23, the height adjustment of the purging needles 59 or the lifting of the purging needles 59 from a test tube (the test tube can be separated from the purging needles 59 through the lifting of the test tube rack 17) is facilitated, the rotating joints 20a are utilized to rotate the purging frame 20 and the direction of the purging needles 59, and the operation from the opening of the test tube is facilitated;

the utility model controls the height of the sample liquid from the blowing needle by detecting the blowing liquid level of the solution in the test tube and lifting the test tube, by precisely heating the water bath liquid and the gas, the test process more strictly follows the test requirements, the evaporation speed of the solution can be further increased, the purging efficiency is improved, thereby obtaining the experimental precision under the same condition, reducing the error and the uncertainty, improving the recovery rate and the analysis accuracy of the sample and the reliability of the whole experimental process, creating conditions for accurate detection, being capable of accurately evaluating the detection result, providing high-value evaluation conclusion for agricultural production, food safety, drug evaluation and the like, thereby ensuring pesticide residue, food and beverage safety and drug use safety, preventing unsafe products from entering daily life, and creating favorable conditions for preventing citizens from panic and stabilizing society.

Claims (10)

1. The utility model provides a full-automatic nitrogen of multichannel blows appearance, includes collector, circulating pump, carousel, air supply pipe, and the air supply pipe tip is provided with a plurality of needles that sweep, and a plurality of needles that sweep stretch into sample solution top in a plurality of test tubes respectively, and the test tube setting is in water bath, and water bath top is provided with the test-tube rack, sweeps the needle fixed plate, and the carousel top is provided with fume hood, its characterized in that: the water bath has a plurality of water bath grooves, the water bath grooves are respectively arranged on the periphery of the turntable at the same intervals, a lifting type test tube rack and a turnover type purging support frame are arranged above the water bath grooves, water distribution tubes are arranged in the water bath grooves, water supply tubes and air supply tubes connected with the circulating pump and the air collecting tube are respectively conveyed to the water distribution tubes and the purging needles through heating water or heating air, photoelectric detection devices for detecting the liquid level of a sample solution in a test tube are arranged on the edges of the water bath grooves, auxiliary water tanks are radially communicated and arranged on the sides of the water bath grooves close to the center of the turntable, the test tube rack and the auxiliary water tanks are respectively connected with respective lifting devices, purging needle fixing plates are hung on the needle blowing rack above the turnover type purging support frame, and the lifting devices, the sample liquid level photoelectric.

2. The multi-channel full-automatic nitrogen blowing instrument according to claim 1, characterized in that: the gas supply pipe and the water supply pipe are respectively provided with a flowmeter, a gas flow control valve or a one-way flow control valve, the blowing needle fixing plate is provided with a plurality of branch pipe joints connected with the blowing needle, the plurality of branch pipes are respectively provided with an automatic miniature gas flow control valve and a manual control valve, and the plurality of automatic miniature gas flow control valves, the flowmeter and the one-way flow control valve are respectively electrically connected with the controller.

3. The multi-channel full-automatic nitrogen blowing instrument according to claim 1, characterized in that: the water bath is internally provided with a liquid level meter and a temperature sensor which are respectively electrically connected with the controller, the water bath is communicated with the auxiliary water tank through a heater and a one-way control valve, the bottom of the water bath is provided with a drain pipe and a one-way valve, the water distribution pipe in the water bath is horizontally or vertically arranged, a plurality of water distribution holes or water distribution gaps are arranged on the periphery of the water distribution pipe, the water distribution pipe which is horizontally arranged is arranged on the edge of the water area pool which is consistent with the length direction of the water bath, the plurality of water distribution holes or water distribution gaps are horizontally arranged and face the opposite side of the water tank, the vertically arranged water distribution pipe is arranged at the central part of the water bath, and the plurality of water distribution holes or.

4. The multi-channel full-automatic nitrogen blowing instrument according to claim 1, characterized in that: the photoelectric detection device for the liquid level of the sample solution in the test tube arranged on the side part of the water bath comprises one or more groups of light sources and light receiving parts, each group of light sources is at least provided with three beams of detection light which are vertically arranged, the three beams of detection light alternately emit light or adopt codes which can be respectively identified to simultaneously modulate and emit light, the distance between the light sources of the three beams of detection light is adjustable, and the water bath is a transparent body at least at the position where the three beams of detection light irradiate.

5. The multi-channel full-automatic nitrogen blowing instrument according to claim 1, characterized in that: the heating part is arranged on the water supply pipe and the air supply pipe, the heating part comprises a heater, the air supply pipe and the water supply pipe are of linear structures or/and spiral structures, the heater, the air supply pipe and the water supply pipe are arranged between an inner layer, a middle layer and an outer layer in an optional combination mode, the air flow direction and the water flow direction of the air supply pipe and the water supply pipe are consistent, the water inlet end and the water outlet end of the heating part are respectively provided with a water temperature sensor, and the two water temperature sensors are.

6. The multi-channel full-automatic nitrogen blowing instrument according to claim 1, characterized in that: the utility model discloses a test tube rack, including lift type test-tube rack, lifting type test-tube rack below is provided with four lead screws, two relative left and right sides lead screw below is threaded connection respectively have turbine lift one, two lead screws are located the water bath left and right sides, be connected with the differential mechanism semi-axis on two turbine lift one's the input shaft respectively, the differential mechanism input passes through the speed reducer and is connected with elevator motor, the test-tube rack with sweep the right angle type upset loose-leaf that is provided with level and perpendicular upset between the support frame, upset direction is towards carousel centre of a circle direction, it has a pair of perpendicular decurrent jib to hang to sweep a horizontal pole below, it is provided with the needle fixed plate to sweep to slide between a pair of jib, jib and sweep and be provided with the rotation joint between the needle.

7. The multi-channel full-automatic nitrogen blowing instrument according to claim 1, characterized in that: the lifting device comprises a micro stepping motor or a micro servo motor, and the micro stepping motor or the micro servo motor is connected to the test tube rack and the auxiliary water tank through a transmission mechanism.

8. The multi-channel full-automatic nitrogen blowing instrument according to claim 1, characterized in that: the water supply pipe is connected between the water bath and the heating part, a circulating pump and a one-way control valve are arranged in the water supply pipe, the water supply pipe is communicated with two water distribution pipes in the water bath, the water distribution pipes are arranged in opposite directions of the long side of the water bath, a multi-channel rotary joint is connected onto the air supply pipe, an outlet of the multi-channel rotary joint leads to each purging frame, a gas distributor is arranged between the multi-channel rotary joint and each purging frame, the gas distributor is used for distributing the gas to each purging needle, a manual valve is arranged on each air supply branch pipe, a conductive sliding ring is adopted for the electric connection between.

9. The multi-channel full-automatic nitrogen blowing instrument according to claim 4, characterized in that: the three detection light sources are arranged on a lead screw with opposite rotation directions, a micro stepping motor or a micro servo motor is connected to the lead screw, and the micro stepping motor or the micro servo motor is connected with the controller.

10. The multi-channel full-automatic nitrogen blowing instrument according to claim 5, characterized in that: the heater of the heating part is a high-frequency heater, a pulse heater, a power frequency or direct current heater.

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