CN113281302A - Rapid measuring device for detecting NMP liquid concentration and operation method thereof - Google Patents
Rapid measuring device for detecting NMP liquid concentration and operation method thereof Download PDFInfo
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- CN113281302A CN113281302A CN202110562773.9A CN202110562773A CN113281302A CN 113281302 A CN113281302 A CN 113281302A CN 202110562773 A CN202110562773 A CN 202110562773A CN 113281302 A CN113281302 A CN 113281302A
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/4133—Refractometers, e.g. differential
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/13—Standards, constitution
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a rapid measuring device for detecting the concentration of NMP liquid, which comprises a handheld refractometer and a base, wherein the handheld refractometer is fixedly provided with a refraction prism, a cover plate is rotatably arranged on a shading prism, a connecting piece is fixedly arranged on the cover plate, an upper clamping piece and a lower clamping piece are fixedly arranged on the handheld refractometer, a handle is fixedly arranged on the handheld refractometer, an insertion hole is arranged on the handle, a sliding groove is arranged on the base, and a rotating seat is movably connected in the sliding groove, the handheld refractometer which is low in price and easy to operate replaces an expensive gas chromatograph or a low-precision distillation method and an experience method to measure the concentration of a high-concentration NMP solution, so that the concentration measuring precision of the NMP solution reaches 0.5%, and the control requirement of recycling the concentration of NMP waste liquid in a lithium battery production plant is met; the aim of measuring the high-concentration solution which is over-limit can be achieved by the operation method of the rapid measuring device for detecting the NMP liquid concentration.
Description
Technical Field
The invention relates to the technical field of industrial environmental protection, in particular to a rapid measuring device for detecting the concentration of NMP liquid and an operation method thereof.
Background
NMP, known as N-methylpyrrolidone, has the chemical formula of C5H9NO and the molecular weight of 99.13106, is an organic compound, is a colorless transparent oily liquid and has slight amine odor. Low volatility, good thermal stability and chemical stability, and can volatilize with water vapor, and has hygroscopicity and photosensitivity to light. It is easily soluble in water, ethanol, diethyl ether, acetone, ethyl acetate, chloroform and benzene, and can dissolve most organic and inorganic compounds, polar gas, natural and synthetic high molecular compounds.
N-methylpyrrolidone (NMP) is an efficient selective solvent and has the advantages of no toxicity, high boiling point, low corrosivity, high solubility, low viscosity, low volatility, good stability, easiness in recovery and the like. NMP is widely used for refining high-grade lubricating oil, synthesizing polymers, insulating materials, pesticides, pigments, cleaning agents and the like, and is widely applied to the industries of lithium batteries, medicines, pesticides, pigments, cleaning agents, insulating materials and the like.
Lithium batteries generally consist of a positive electrode material, a negative electrode material, a separator, an electrolyte, and a case. The anode material is always the core of the lithium ion battery, the selection of the anode material directly determines the performance of the battery, the production of the anode plate is to use a coating machine to coat and dry the prepared anode slurry, and the preparation process is to mix various components in the slurry together according to a standard proportion to prepare the slurry, so as to be beneficial to uniform coating and ensure the consistency of the electrode plate. The positive pole piece is prepared from a positive pole material, a conductive agent, an adhesive, a solvent and the like, NMP is used as the solvent to stir mixed slurry in the production of the positive pole of the lithium battery, a large amount of high-concentration NMP waste gas can be produced in the baking process of the coating production of the positive pole, and the waste gas discharged into the atmosphere can cause serious pollution and waste of serious materials.
Lithium battery production units are generally equipped with an NMP waste gas recovery device in the positive electrode coating process, high-temperature NMP waste gas is condensed to form liquid, the liquid is stored in a stainless steel storage tank, the liquid is sent to a professional NMP waste liquid purification factory for purification treatment after a certain amount of the liquid is stored, electronic grade NMP liquid with the concentration of more than 99.9% is obtained, cyclic utilization of NMP is achieved, and therefore the production cost of the positive electrode is reduced.
When the NMP waste liquid is purified, a professional manufacturer generally requires that the concentration of the NMP waste liquid reaches over 75 percent, when the NMP waste liquid is purified into a new liquid, the NMP waste liquid is returned to a lithium battery manufacturer according to the concentration content, the professional manufacturer generally uses a gas chromatograph with higher price for testing when testing the concentration of the NMP waste liquid, the skill requirement on operators is higher, and a lithium battery production unit generally does not prepare instruments and professional operators due to the cost consideration; observing and determining the color of the waste liquid in an empirical method; the two concentration measurement methods are rough and inaccurate in concentration, and the purification of the NMP waste liquid in a lithium battery production unit is carried out according to the concentration tested by a professional manufacturer, so that the effective supervision is lacked, and certain economic loss is often caused.
In view of the above, we propose a rapid measurement device for detecting NMP liquid concentration and an operation method thereof.
Disclosure of Invention
The present invention is directed to a rapid measuring device for detecting NMP liquid concentration and an operating method thereof, so as to solve the problems of the background art mentioned above.
In order to achieve the purpose, the invention provides the following technical scheme: a rapid measuring device for detecting NMP liquid concentration comprises a handheld refractometer and a base, wherein a refraction prism is fixedly arranged on the handheld refractometer, a cover plate is rotatably arranged on the shading prism, a connecting piece is fixedly arranged on the cover plate, an upper clamping piece and a lower clamping piece are fixedly arranged on the handheld refractometer, and a handle is fixedly arranged on the hand-held refractometer, an insertion hole is arranged on the handle, a sliding groove is arranged on the base, a rotating seat is movably connected in the sliding groove, a positioning rod is fixedly arranged on the rotating seat, a wide opening groove and a limiting groove are arranged on the base, a guide rod is fixedly arranged on the base, and a top plate is fixedly arranged on the guide rod, a lifting seat is slidably arranged on the guide rod, a cylinder is fixedly connected on the lifting seat, and a wiping structure with a circulation function is installed on the lifting seat, and an isolated suction structure is fixedly installed on the guide rod.
Preferably, the shading prism sets up on the domatic of handheld refractometer front end, and the apron passes through 360 hinge installations, the apron is the transparent plate, and the connecting piece is connected at the tip of apron, go up fastener and lower fastener and install respectively on the upper portion and the lower part of handheld refractometer.
Preferably, be provided with anti-skidding line on the handle, and the jack setting is in the bottom of handle, the jack sets up to the quad slit, and the locating lever is the cuboid pole.
Preferably, the sliding groove is formed in the middle of the wide opening groove and the limiting groove, the rotating seat is connected to the sliding groove through a mandrel at the bottom, and the positioning rod is vertically installed at the top of the rotating seat.
Preferably, the guide rods are vertically arranged on the base, the top plate is arranged at the top of the guide rods, the lifting seat is connected to the guide rods through holes in the lifting seat, and the air cylinder is connected between the lifting seat and the top plate.
Preferably, the wiping structure comprises a spring, a sliding block, a hanging rod, a fixing clamp, flannelette, a rotating rod and a pressing wheel.
Preferably, jib swing joint leads to the inslot on the seat that goes up and down, and slider and fixation clamp connect respectively at the both ends of jib, spring coupling installs two sets ofly on the slider more than the structural symmetry, the cotton flannel is connected between the fixation clamp, and the bull stick passes through motor drive, installs between two sliders, the pinch roller rotates the tip of installing at the bull stick, and is provided with the arcwall face on the slider.
Preferably, the suction structure is including drawing water mouth and straw, and draws water the mouth and install the inboard at the guide bar, the straw is external in the air pump.
A method of operating a rapid measurement device for detecting NMP liquid concentration, the method comprising the steps of:
s1: (instrument reagent preparation) preliminary cleaning of the handheld refractometer is carried out, flannels on a fixing clamp are replaced, then deionized water is adopted, an NMP solution with known mass concentration is prepared, and the handheld refractometer is calibrated from the NMP solution with the lowest concentration;
s2: (demarcate handheld refractometer measuring range) after the NMP solution of the lowest concentration is demarcated, the handheld refractometer is placed on the base through the handle, then the rotating base is correspondingly sent into the limiting groove, the cleaning process is carried out, the automatic cleaning and wiping are carried out through the wiping structure and the suction structure which are arranged on the base, the user prepares the NMP of the next concentration in the process, then the clean handheld refractometer is demarcated, finally the demarcation of the handheld refractometer is completed by using a series of known NMP solutions of different concentrations, and the concentration accuracy and the limiting value of the NMP solution measured by the handheld refractometer are determined;
s3: after the measurement limit value of the handheld refractometer is determined, diluting the high-concentration NMP solution to be measured, determining the optimal proportion of the diluted concentration, then measuring the concentration of the diluted solution by using the handheld refractometer, and finally calculating the actual concentration value of the NMP solution according to the dilution proportion, so that the concentration measurement precision of the NMP solution reaches 0.5%, and the control requirement of the lithium battery production plant on the concentration of the recovered NMP waste liquid is met.
Compared with the prior art, the invention has the beneficial effects that:
1. the concentration of the high-concentration NMP solution is determined by replacing an expensive gas chromatograph or a low-precision distillation method or an empirical method with a low-price and easy-to-operate handheld refractometer, and the handheld refractometer is provided with a base with a double automatic cleaning structure in a matching manner, so that the handheld refractometer can be automatically cleaned and cleaned in a use gap of the handheld refractometer, a user can leave two hands free to configure a calibration solution, the measurement efficiency is improved, the concentration measurement precision of the NMP solution reaches 0.5%, and the control requirement of recycling the NMP waste liquid concentration in a lithium battery production plant is met;
2. according to the operation method of the rapid measuring device for detecting the liquid concentration of the NMP, disclosed by the invention, a series of NMP solutions with known concentrations can be used for calibrating the handheld refractometer, the concentration accuracy and the limit value of the NMP solution measured by the rapid measuring device are determined, and the solution to be measured can be diluted according to the limit value, so that the purpose of measuring the high-concentration solution with the excessive limit is achieved.
Drawings
FIG. 1 is a schematic view of the front structure of the present invention;
FIG. 2 is a schematic view of the rear structure of the present invention;
FIG. 3 is a schematic view of the bottom structure of the present invention;
FIG. 4 is a schematic diagram of a handheld refractometer according to the invention.
In the figure: the portable refractometer comprises a handheld refractometer 1, a base 2, a refraction prism 3, a cover plate 4, a connecting piece 5, an upper clamping piece 6, a lower clamping piece 7, a handle 8, a jack 9, a sliding groove 10, a rotating seat 11, a positioning rod 12, an open groove 13, a limiting groove 14, a guide rod 15, a top plate 16, a lifting seat 17, a cylinder 18, a spring 19, a sliding block 20, a hanging rod 21, a fixing clamp 22, flannelette 23, a rotating rod 24, a pressing wheel 25, a water pumping port 26 and a suction pipe 27.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, the present invention provides a technical solution: a rapid measuring device for detecting NMP liquid concentration comprises a handheld refractometer 1 and a base 2, wherein a refraction prism 3 is fixedly installed on the handheld refractometer 1, a cover plate 4 is rotatably installed on a shading prism 3, a connecting piece 5 is fixedly installed on the cover plate 4, an upper clamping piece 6 and a lower clamping piece 7 are fixedly installed on the handheld refractometer 1, a handle 8 is fixedly installed on the handheld refractometer 1, a jack 9 is arranged on the handle 8, a sliding groove 10 is arranged on the base 2, a rotating seat 11 is movably connected in the sliding groove 10, a positioning rod 12 is fixedly installed on the rotating seat 11, an open groove 13 and a limiting groove 14 are arranged on the base 1, a guide rod 15 is fixedly installed on the base 1, a top plate 16 is fixedly installed on the guide rod 15, a lifting seat 17 is slidably installed on the guide rod 15, an air cylinder 18 is fixedly connected on the lifting seat 17, and a wiping structure with a circulation function is installed on the lifting seat 17, an isolated suction structure is fixedly mounted on the guide rod 15.
The shading prism 3 is arranged on the slope surface at the front end of the handheld refractometer 1, the cover plate 4 is installed through a 360-degree hinge, the cover plate 4 is a transparent plate, the connecting piece 5 is connected with the end part of the cover plate 4, the upper clamping piece 6 and the lower clamping piece 7 are respectively arranged at the upper part and the lower part of the handheld refractometer 1, the handheld refractometer 1 is an instrument for testing the concentration of liquid by utilizing light rays, can test the refractive index nD and the average dispersion nF-nC of transparent and semitransparent liquid or solid, and drops the solution to be detected on the shading prism 3 when in use, and the concentration of the solution is measured by observing through the ocular lens of the handheld refractometer 1, the measurement of the handheld refractometer 1 is rapid, the cover plate 4 is a protection structure of the shading prism 3, can be turned over for 360 degrees, is respectively fixed on the upper part and the lower part of the handheld refractometer 1 by using connecting pieces 5, and corresponds to a testing process and a cleaning process;
the handle 8 is provided with anti-skid grains, the jack 9 is arranged at the bottom of the handle 8, the jack 9 is a square hole, the positioning rod 12 is a cuboid rod, after one-time test of the handheld refractometer 1 is finished, the shading prism 3 needs to be cleaned to carry out the next test, in the gap of the two tests, the handheld refractometer 1 can be placed on the base 1 through the handle 8 to carry out automatic cleaning and wiping, and a user can dispose a solution to separately carry out two works, thereby increasing the working efficiency;
the sliding groove 10 is arranged in the middle of the open groove 13 and the limiting groove 14, the rotating seat 11 is connected into the sliding groove 10 through a mandrel at the bottom, the positioning rod 12 is vertically arranged at the top of the rotating seat 11, the handheld refractometer 1 is mainly connected with the positioning rod 12 through the jack 9 on the handle 8 and is placed on the rotating seat 11, the rotating seat 11 can slide in the sliding groove 10 and can rotate, the open groove 13 provides a rotating space, so that the handheld refractometer 1 can be conveniently placed on the rotating seat 11 at any angle, the use is very convenient, and then the rotating seat 11 is correspondingly sent into the limiting groove 14 to enter a cleaning process;
two guide rods 15 are vertically arranged on the base 2, the top plate 16 is arranged at the top of the guide rods 15, the lifting seat 17 is connected to the guide rods 15 through holes in the lifting seat 17, the air cylinder 18 is connected between the lifting seat 17 and the top plate 16, the base 1 is movably arranged on the lifting seat 17 through the guide rods 15, the position of the lifting seat 17 is controlled through the air cylinder 18, a space is reserved for the lifting seat 17 to ascend, so that the handheld refractometer 1 can conveniently enter, and the lifting seat 17 descends to clean the handheld refractometer 1;
the wiping structure comprises a spring 19, a slide block 20, a hanging rod 21, a fixing clamp 22, flannelette 23, a rotating rod 24 and a pressing wheel 25;
the suspender 21 is movably connected in a guide through groove on the lifting seat 17, the sliding blocks 20 and the fixing clamps 22 are respectively connected at two ends of the suspender 21, the spring 19 is connected on the sliding blocks 20, two groups of the above structures are symmetrically arranged, the flannelette 23 is connected between the fixing clamps 22, the rotating rod 24 is driven by a motor and is arranged between the two sliding blocks 20, the pinch roller 25 is rotatably arranged at the end part of the rotating rod 24, and the sliding blocks 20 are provided with arc surfaces, when the wiping structure works, firstly, the lifting seat 17 drives the flannelette 23 to lightly fall on the shading prism 3, then, the rotating rod 24 drives the pinch roller 25 to rotate, the rotating wheel 25 rotates to the position of the sliding block 20 at one side and can extrude the sliding block, so that the sliding block 20 moves, after the rotating wheel 25 rotates away, the spring 19 resets the sliding block 20, so that the two sliding blocks 20 are matched and perform reciprocating left and right movement, so that the flannelette 23 is driven by the suspender 21 and the fixing clamps 22 to move left and right, completing the automatic wiping of the shading prism 3;
the suction structure comprises a water pumping port 26 and a suction pipe 27, the water pumping port 26 is installed on the inner side of the guide rod 15, the suction pipe 27 is externally connected with the air pump, before the lifting seat 17 descends to wipe, the air pump can be started, the suction pipe 27 and the water pumping port 26 are used for pumping away the solution on the shading prism 3, the wiping difficulty of the lint 23 is reduced, and the service time of the single lint 23 is prolonged.
A method of operating a rapid measurement device for detecting NMP liquid concentration, the method comprising the steps of:
s1: (instrument reagent preparation) to carry out preliminary cleaning on the handheld refractometer 1, replacing the flannelette 23 on the fixing clamp 22, then adopting deionized water to begin to prepare an NMP solution with known mass concentration, and beginning from the NMP solution with the lowest concentration to calibrate the handheld refractometer 1;
s2: (calibrating the measurement range of the handheld refractometer) after the calibration of the NMP solution with the lowest concentration is finished, the handheld refractometer 1 is placed on the base 1 through the handle 8, the rotating seat 11 is correspondingly sent into the limiting groove 14, the cleaning process is carried out, the automatic cleaning and wiping are carried out through the wiping structure and the suction structure which are arranged on the base 1, the NMP with the next concentration is prepared by a user in the process, then the calibration is carried out by using the handheld refractometer 1 which is finished through cleaning, finally the calibration of the handheld refractometer 1 is finished by using a series of known NMP solutions with different concentrations, and the concentration accuracy and the limiting value of the NMP solution which is measured by the handheld refractometer are determined;
s3: after the measurement limit value of the handheld refractometer 1 is determined, (diluting and measuring the solution to be measured) diluting the high-concentration NMP solution to be measured, determining the optimal proportion of the diluted concentration, then measuring the concentration of the diluted solution by using the handheld refractometer 1, and finally calculating the actual concentration value of the NMP solution according to the dilution proportion, so that the concentration measurement precision of the NMP solution reaches 0.5%, and the management and control requirements of the lithium battery production plant on the concentration of the recovered NMP waste liquid are met.
The working principle is as follows: firstly, the hand-held refractometer 1 is an instrument for testing the concentration of liquid by using light, can measure the refractive index nD and the average dispersion nF-nC of transparent, semitransparent liquid or solid, when in use, a solution to be detected is dropped on the shading prism 3 and is observed through an eyepiece of the hand-held refractometer 1, the concentration of the solution is measured, the measurement of the hand-held refractometer 1 is rapid and low in price, the cover plate 4 is a protective structure of the shading prism 3 and can be overturned for 360 degrees, the connecting pieces 5 are respectively fixed at the upper part and the lower part of the hand-held refractometer 1, corresponding to the test process and the cleaning process, after one-time test of the hand-held refractometer 1 is finished, the hand-held refractometer 3 must be cleaned for the next-time test, and in the interval of two-time tests, the hand-held refractometer 1 can be placed on the base 1 through the handle 8 for automatic cleaning and wiping, a user can dispose a solution, two works are carried out separately, the working efficiency is improved, the handheld refractometer 1 is mainly connected with the positioning rod 12 through the jack 9 on the handle 8 and then placed on the rotating seat 11, the rotating seat 11 can slide in the sliding groove 10 and can rotate, the open groove 13 provides a rotating space, so that the handheld refractometer 1 can be conveniently placed on the rotating seat 11 at any angle, the use is very convenient, then the rotating seat 11 is correspondingly sent into the limiting groove 14 to enter a cleaning process, the movable installation of the lifting seat 17 is carried out on the base 1 through the guide rod 15, the position of the lifting seat 17 is controlled through the air cylinder 18, the space is reserved on the lifting seat 17 in a lifting way, so that the handheld refractometer 1 can conveniently enter, and the cleaning and wiping of the handheld refractometer 1 are carried out when the lifting seat 17 descends; when the wiping structure works, firstly, the lifting seat 17 drives the lint 23 to lightly fall on the shading prism 3, then the rotating rod 24 drives the pressing wheel 25 to rotate, the rotating wheel 25 rotates to the position of the slider 20 on one side to extrude the slider, so that the slider 20 moves, after the rotating wheel 25 rotates away, the spring 19 resets the slider 20, so that the two sliders 20 are matched to move left and right in a reciprocating mode, so that the lint 23 is driven to move left and right through the hanging rod 21 and the fixing clamp 22, the automatic wiping of the shading prism 3 is completed, before the lifting seat 17 descends to wipe, the air pump can be started, the solution on the shading prism 3 is pumped away through the suction pipe 27 and the water pumping port 26, the wiping difficulty of the lint 23 is reduced, and the service life of the single lint 23 is prolonged.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A quick measuring device for detecting NMP liquid concentration, includes handheld refractometer (1) and base (2), its characterized in that: the improved light shading device is characterized in that a refraction prism (3) is fixedly mounted on the handheld refractometer (1), a cover plate (4) is rotatably mounted on the shading prism (3), a connecting piece (5) is fixedly mounted on the cover plate (4), an upper clamping piece (6) and a lower clamping piece (7) are fixedly mounted on the handheld refractometer (1), a handle (8) is fixedly mounted on the handheld refractometer (1), a jack (9) is arranged on the handle (8), a sliding groove (10) is arranged on the base (2), a rotating seat (11) is movably connected in the sliding groove (10), a positioning rod (12) is fixedly mounted on the rotating seat (11), a wide opening groove (13) and a limiting groove (14) are arranged on the base (1), a guide rod (15) is fixedly mounted on the base (1), a top plate (16) is fixedly mounted on the guide rod (15), and a lifting seat (17) is slidably mounted on the guide rod (15), fixedly connected with cylinder (18) on lift seat (17), and install the structure of cleaning that has the circulation function on lift seat (17), fixed mounting has the suction structure of isolated on guide bar (15).
2. A rapid measuring device for detecting NMP liquid concentration according to claim 1, characterized in that: shading prism (3) set up on the domatic of handheld refractometer (1) front end, and apron (4) through 360 hinge mount, apron (4) are the transparent plate, and connecting piece (5) connect the tip at apron (4), go up fastener (6) and lower fastener (7) and install upper portion and the lower part at handheld refractometer (1) respectively.
3. A rapid measuring device for detecting NMP liquid concentration according to claim 1, characterized in that: be provided with anti-skidding line on handle (8), and jack (9) set up the bottom at handle (8), jack (9) set up to the quad slit, and locating lever (12) are rectangular pole.
4. A rapid measuring device for detecting NMP liquid concentration according to claim 1, characterized in that: the sliding groove (10) is arranged in the middle of the wide opening groove (13) and the limiting groove (14), the rotating seat (11) is connected into the sliding groove (10) through a mandrel at the bottom, and the positioning rod (12) is vertically arranged at the top of the rotating seat (11).
5. A rapid measuring device for detecting NMP liquid concentration according to claim 1, characterized in that: guide bar (15) are installed two perpendicularly on base (2), and roof (16) are installed at the top of guide bar (15), lift seat (17) are connected on guide bar (15) through the through-hole on it, and cylinder (18) are connected between lift seat (17) and roof (16).
6. A rapid measuring device for detecting NMP liquid concentration according to claim 1, characterized in that: the wiping structure comprises a spring (19), a sliding block (20), a hanging rod (21), a fixing clamp (22), flannelette (23), a rotating rod (24) and a pressing wheel (25).
7. A rapid measuring device for detecting NMP liquid concentration according to claim 6, characterized in that: jib (21) swing joint leads to the inslot in the direction on lift seat (17), and slider (20) and fixation clamp (22) connect respectively at the both ends of jib (21), spring (19) are connected on slider (20), and two sets of are installed to above structural symmetry, lint (23) are connected between fixation clamp (22), and bull stick (24) pass through motor drive, install between two slider (20), pinch roller (25) rotate the tip of installing at bull stick (24), and are provided with the arcwall face on slider (20).
8. A rapid measuring device for detecting NMP liquid concentration according to claim 1, characterized in that: the suction structure comprises a water pumping port (26) and a suction pipe (27), the water pumping port (26) is installed on the inner side of the guide rod (15), and the suction pipe (27) is externally connected with the air pump.
9. A method of operating a rapid measuring device for detecting NMP liquid concentration according to any one of claims 1 to 8, characterized in that the method comprises the steps of:
s1: (instrument reagent preparation) to carry out preliminary cleaning on the handheld refractometer (1), replacing flannels (23) on a fixing clamp (22), then adopting deionized water to begin to prepare an NMP solution with known mass concentration, and calibrating the handheld refractometer (1) from the NMP solution with the lowest concentration;
s2: (demarcate handheld refractometer measuring range) after the calibration of the NMP solution with the lowest concentration is finished, the handheld refractometer (1) is placed on the base (1) through the handle (8), then the rotating seat (11) is correspondingly sent into the limiting groove (14) to enter the cleaning process, the automatic cleaning and wiping are carried out through the wiping structure and the suction structure which are arranged on the base (1), and the user prepares the NMP with the next concentration in the process, then the cleaned handheld refractometer (1) is used for demarcating, finally the calibration of the handheld refractometer (1) is finished by using a series of known NMP solutions with different concentrations, and the concentration accuracy and the limiting value of the measured NMP solution are determined;
s3: after the measurement limit value of the handheld refractometer (1) is determined, (diluting and measuring the solution to be measured) diluting the high-concentration NMP solution to be measured, determining the optimal proportion of the diluted concentration, then measuring the concentration of the diluted solution by using the handheld refractometer (1), and finally calculating the actual concentration value of the NMP solution according to the dilution proportion, so that the concentration measurement precision of the NMP solution reaches 0.5%, and the management and control requirements of the lithium battery production plant on the concentration of the recovered NMP waste liquid are met.
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| CN113281302B (en) | 2022-06-28 |
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Effective date of registration: 20230403 Address after: Factory buildings D3 and K5 of Small and Medium sized Entrepreneurship Park in Guiyang City, Guizhou Province, 550081 Patentee after: GUIZHOU GUIHANG NEW ENERGY TECHNOLOGY CO.,LTD. Address before: 518109 floors 2, 4 and 5, No. 42, Langkou Industrial Park, Langkou community, Dalang street, Longhua District, Shenzhen, Guangdong Patentee before: Shenzhen Guihang Electronics Co.,Ltd. |
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