Cleaning method for platinum crucible with water jet cutter grinding and polishing surface

Abstract

The invention relates to a method for cleaning a platinum crucible with a water jet cutter grinding and polishing surface. According to the scheme, a vacuum overturning suction cup (15) is used for sucking the outer bottom or the inner bottom of a crucible (14), a nozzle (10) is aligned to any point of the inner surface or the outer surface of the crucible, the inner wall, the outer wall, the inner bottom face and the outer bottom face of the crucible (14) are cleaned through water jet flow, and first cleaning is completed; the crucible (14) is dried through hot air and normal-temperature air, and the mass of the crucible (14) cleaned for the first time is weighed and recorded as m1g; the second time of cleaning is repeated, and the mass of the repeatedly cleaned crucible is weighed and recorded as m2; the difference value of m1-m2 is calculated, and the difference value is lt; when the weight is 0.001 g, cleaning is stopped; the difference value is gt; when the weight is 0.001 g, repeatedly cleaning to a difference value lt; when the weight is 0.001 g, the cleaning is stopped; and washing with pure water, and blow-drying to obtain the clean crucible. The method is free of acidic emissions and environment-friendly, the efficiency is improved, and pollution errors are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of cleaning platinum crucibles for chemical analysis and specifically relates to a method for cleaning a platinum crucible with a surface polished by a water jet. Background Art

[0002] Waterjet cutting, also known as waterjet, is a high-pressure water jet cutting technology. It is a machine that uses high-pressure water jet cutting. The preparation of X-ray fluorescence spectrometry analysis samples is to place the sample powder and flux in a platinum gold crucible, melt at high temperature, and cool to obtain a glassy solid solution. After the whole piece of glass is taken out, a small amount of residual melt is attached to the inner wall and bottom of the platinum crucible, which must be cleaned before it can be used again. At present, the conventional cleaning method is to heat and soak the melt with hydrochloric acid to dissolve it, and then rinse it with water. If the platinum crucible is not cleaned thoroughly, cross contamination will occur. The reduced smoothness of the platinum crucible surface will affect the mixing of the melt and thus affect the melting efficiency of the reuse. Therefore, the platinum crucible needs to be cleaned and polished frequently, and even remelted and refurbished. The existing method requires the use of acid, which is not only time-consuming, but also has a large loss of smoothness on the inner wall of the platinum crucible after cleaning. The subjective judgment of the cleanliness of the crucible cleaning is prone to contamination errors.

[0003] The patented technology of "A platinum crucible boiling and cleaning device" (CN202221198744.5) adopts a platinum crucible boiling and cleaning device, which can overcome the current situation that the beaker of the existing platinum crucible is fragile, which makes the circuit board and the electric furnace wire easily corroded by acid. At the same time, it solves the problem that the clamps easily scratch the bottom of the platinum crucible when clamping the platinum crucible after boiling. However, there are still problems such as the easy breakage of glassware and the use of acid.

[0004] The patented technology of "A platinum crucible cleaning method" (CN202210808991.0) uses ultrasonic cleaning to improve the mobility of acid-etched molecules, thereby improving the cleaning efficiency, but it still requires acidic environment operation and the use of acid.

[0005] The patented technology of "A method for cleaning a yellow platinum crucible after high-temperature melting of minerals" (CN202210000329.2) proposes an ultrasonic cleaning method, which utilizes the vibration of acid molecules under the action of sound waves to destroy the adsorption of dirt and the surface of the cleaning part, causing fatigue damage to the dirt layer and being removed. The vibration of gas bubbles scrubs the solid surface, which only improves the pickling efficiency, but cannot avoid the use of acid. Scrubbing cannot polish the surface of the crucible.

[0006] In summary, the prior art has the following technical defects: acid is required to produce acidic discharge liquid, manual operation in an acidic environment is harmful to health, the platinum crucible loses its smoothness after cleaning, thereby reducing the mixing effect of the melting process, and the subjective evaluation of the cleanliness of the platinum crucible may contaminate the next melting sample. Summary of the invention

[0007] The present invention aims to overcome the defects of the prior art and has the object of providing a method for cleaning a platinum crucible with a water jet polished surface, which method can polish and clean the surface of the platinum crucible at the same time, does not produce acidic liquid discharge, can improve melting efficiency, avoids cross contamination of the platinum crucible and can reduce test errors.

[0008] To achieve the above object, the steps of the technical solution adopted by the present invention are:

[0009] For simplicity, the platinum crucible to be cleaned is called the crucible.

[0010] The crucible cleaning method adopts "a water jet platinum crucible cleaning device", writes the size of the crucible into the main control program of the water jet platinum crucible cleaning device, obtains a three-dimensional image of the crucible, and performs the following operations according to the three-dimensional image of the crucible:

[0011] Step 1, follow the steps below: suck the outer bottom or inner bottom of the crucible with a vacuum flip suction cup, and align the water jet nozzle with any point on the inner or outer surface of the crucible; set: the distance between the water jet nozzle and the cleaning surface of the crucible is 5-7mm; the linear velocity of the crucible is 10-5mm / sec, the water pressure is 30-20MPa, the angle between the water jet direction and the cleaning inner and outer wall surfaces is 3-5°, and the angle between the water jet direction and the inner and outer bottom surfaces is -10-+10°.

[0012] The inner wall, outer wall, inner bottom surface and outer bottom surface of the crucible are cleaned respectively with a water jet.

[0013] Complete the first cleaning;

[0014] Step 2: Control the crucible moving system and the flushing and drying system, blow with hot air and room temperature air for 60 to 90 seconds respectively, weigh the mass of the crucible after the first cleaning and record it as m1 grams.

[0015] Step 3: Repeat step 1 and weigh the mass of the crucible cleaned for the second time, recorded as m2.

[0016] Calculate the difference between m1 and m2, and stop cleaning when the difference is less than 0.001 grams.

[0017] When the difference is > 0.001 g, repeat step 1 until the difference is < 0.001 g and stop cleaning.

[0018] Step 4: Control the crucible moving system and the flushing and air-drying system, flush the crucible 14 with pure water three times, and use cold air and hot air to blow for 60 to 90 seconds each to obtain a clean crucible.

[0019] The water jet platinum crucible cleaning device is composed of a program-controlled water jet system, a crucible moving system and a flushing and air-drying system.

[0020] The structure of the programmable water jet system is: the output shaft of the water jet motor is connected to the input shaft of the high-pressure pump, the water jet water tank is connected to the filter screen and the water inlet end of the high-pressure pump through a water pipe, the water outlet end of the high-pressure pump is connected to the water inlet end of the water jet nozzle, and the water jet nozzle is fixed directly above the electric lifting column through a fixing plate.

[0021] The structure of the crucible moving system is as follows: the top of the electric lifting column is fixedly connected to the lower surface of the bottom of the flat plate, the upper parts of the front and rear sides of the electric angular displacement table are respectively hinged to the bottom of the front and rear sides of the guide rail through corresponding connecting rods, the electric slider is slidably connected to the guide rail, and the bottom of the electric rotating clamp is fixedly connected to the upper plane of the electric slider; the electric lifting column is directly driven by a lifting DC motor, the electric angular displacement table and the electric slider are directly driven by their own DC programmable motors, the maximum distance that the electric slider moves to the right along the guide rail is 80 to 110 mm, and the inclination angle of the guide rail is 0 to 30°.

[0022] The structure of the flushing and air-drying system is that the nozzle of the programmable electric heating hair dryer is installed directly above the vacuum flip suction cup, the distance between the nozzle and the rotating shaft of the vacuum flip suction cup is 50 to 100 mm, a pure water nozzle is provided directly below the vacuum flip suction cup, and the pure water nozzle is connected to the pure water tank through a fish tank water pump; the distance from the axis of the nozzle to the upper plane of the vacuum flip suction cup is 50 to 100 mm, and the distance from the mouth of the pure water nozzle to the upper plane of the vacuum flip suction cup is 50 to 100 mm.

[0023] The crucible is a platinum crucible for melting samples for chemical analysis.

[0024] The water pressure of the water knife is adjustable between 10 and 30 MPa.

[0025] The electric rotating clamp can rotate 360 ​​degrees infinitely and the speed can be adjusted by program control; the gripping force is 1-5kg.

[0026] The suction force of the vacuum flip suction cup is 3-5kg.

[0027] The heating power of the program-controlled electric heating hair dryer is 300-500w.

[0028] The fish tank water pump has a lift of 300 to 1500 mm and a flow rate of 60 to 200 L / h.

[0029] The precision of the analytical balance is 0.1 mg.

[0030] The angle range of the electric angular displacement stage is ±15.

[0031] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art:

[0032] 1. The present invention utilizes a water jet to grind the molten material remaining on the bottom and wall of the platinum crucible without using any acid. Therefore, the absence of acidic emissions is beneficial to emission reduction. The operation is performed in an environment where no acidic solution is used, which is beneficial to labor protection.

[0033] 2. The present invention utilizes high-pressure water flow to grind the residue and polish the surface of the platinum crucible at the same time, thereby ensuring that the surface of the platinum crucible is smooth, which is conducive to the flow and mixing of the melt, and thus can improve the melting efficiency.

[0034] 3. The present invention evaluates the cleanliness of the platinum crucible by weighing the mass change of the platinum crucible after two consecutive cleaning and polishing, thereby avoiding the influence of the cleanliness of the previous cleaning of the platinum crucible when the platinum crucible is used again, thereby reducing the contamination error.

[0035] Therefore, the present invention has the characteristics of no acidic discharge, being environmentally friendly, being beneficial to labor protection, improving melting efficiency, and reducing pollution errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of a water jet platinum crucible cleaning device adopted in the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to limit the scope of protection thereof.

[0038] A method for cleaning a platinum crucible with a water jet polished surface. The platinum crucible cleaning method described in this specific embodiment is:

[0039] For simplicity, the platinum crucible to be cleaned is called the crucible.

[0040] The crucible cleaning method adopts "a water jet platinum crucible cleaning device", writes the size of the crucible 14 into the main control program of the water jet platinum crucible cleaning device, obtains a three-dimensional image of the crucible, and performs the following operations according to the three-dimensional image of the crucible:

[0041] Step 1, follow the steps below: suck the outer bottom or inner bottom of the crucible 14 with the vacuum flip suction cup 15, and align the water jet nozzle 10 with any point on the inner or outer surface of the crucible; set: the distance between the water jet nozzle 10 and the cleaning surface of the crucible is 5 to 7 mm; the linear velocity of the crucible 14 is 10 to 5 mm / sec, the water pressure is 30 to 20 MPa, the angle between the water jet direction and the cleaning inner and outer wall surfaces is 3 to 5°, and the angle between the water jet direction and the inner and outer bottom surfaces is -10 to +10°.

[0042] The inner wall, outer wall, inner bottom surface and outer bottom surface of the crucible 14 are cleaned respectively by water jets.

[0043] Complete the first cleaning;

[0044] Step 2: Control the crucible moving system and the flushing and drying system, blow with hot air and room temperature air for 60 to 90 seconds respectively, weigh the mass of the crucible 14 after the first cleaning, and record it as m1 grams.

[0045] Step 3: Repeat step 1 and weigh the mass of the crucible cleaned for the second time, recorded as m2.

[0046] Calculate the difference between m1 and m2, and stop cleaning when the difference is less than 0.001 grams.

[0047] When the difference is > 0.001 g, repeat step 1 until the difference is < 0.001 g and stop cleaning.

[0048] Step 4: Control the crucible moving system and the flushing and air-drying system, flush the crucible 14 with pure water three times, and use cold air and hot air to blow for 60 to 90 seconds each to obtain a clean crucible.

[0049] The gripping force of the electric rotating clamp 11 is 1-5 kg.

[0050] The suction force of the vacuum flip suction cup 15 is 3-5 kg.

[0051] The heating power of the program-controlled electric hair dryer 12 is 300-500w.

[0052] The fish tank water pump 17 has a head of 300 to 1500 mm and a flow rate of 60 to 200 L / h.

[0053] In this specific implementation mode:

[0054] The water jet platinum crucible cleaning device is composed of a program-controlled water jet system, a crucible moving system and a flushing and air-drying system.

[0055] The structure of the programmable water jet system is: the output shaft of the water jet motor 3 is connected to the input shaft of the high-pressure pump 4, the water jet water tank 1 is connected to the filter screen 2 and the water inlet end of the high-pressure pump 4 through a water pipe, the water outlet end of the high-pressure pump 4 is connected to the water inlet end of the water jet nozzle 10, and the water jet nozzle 10 is fixed directly above the electric lifting column 5 through a fixing plate.

[0056] The structure of the crucible moving system is as follows: the top of the electric lifting column 5 is fixedly connected to the lower surface of the bottom of the flat plate 6, the upper parts of the front and rear sides of the electric angular displacement table 7 are respectively hinged to the bottom of the front and rear sides of the guide rail 8 through corresponding connecting rods, the electric slider 9 is slidably connected to the guide rail 8, and the bottom of the electric rotating clamp 11 is fixedly connected to the upper plane of the electric slider 9; the electric lifting column 5 is directly driven by a lifting DC motor, the electric angular displacement table 7 and the electric slider 9 are directly driven by their own DC programmable motors, the maximum distance that the electric slider 9 moves to the right along the guide rail 8 is 80 to 110 mm, and the inclination angle of the guide rail 8 is 0 to 30°.

[0057] The structure of the flushing and air-drying system is that the air nozzle 13 of the programmable electric hot hair dryer 12 is installed directly above the vacuum flip suction cup 15, the distance between the air nozzle 13 and the rotating axis of the vacuum flip suction cup 15 is 50 to 100 mm, and a pure water nozzle 16 is provided directly below the vacuum flip suction cup 15, and the pure water nozzle 16 is connected to the pure water tank 18 through the fish tank water pump 17; the distance from the axis of the air nozzle 13 to the upper plane of the vacuum flip suction cup 15 is 50 to 100 mm, and the distance from the mouth of the pure water nozzle 16 to the upper plane of the vacuum flip suction cup 15 is 50 to 100 mm.

[0058] The crucible 14 is a platinum crucible for melting samples for chemical analysis.

[0059] The maximum water pressure of the water jet nozzle 10 is 30 MPa.

[0060] The electric rotating jaw 11 can rotate 360 ​​degrees infinitely, and the speed can be adjusted by program control.

[0061] The precision of the analytical balance is 0.1 mg.

[0062] The angle range of the electric angular displacement stage 7 is ±15.

[0063] This will not be described in detail in the embodiments.

[0064] Example 1

[0065] A method for cleaning a platinum crucible with a water jet polished surface. The platinum crucible cleaning method described in this embodiment is:

[0066] The crucible cleaning method adopts "a water jet platinum crucible cleaning device", writes the size of the crucible 14 into the main control program of the water jet platinum crucible cleaning device, obtains a three-dimensional image of the crucible, and performs the following operations according to the three-dimensional image of the crucible:

[0067] Step 1, follow the steps below: suck the outer bottom or inner bottom of the crucible 14 with the vacuum flip suction cup 15, and align the water jet nozzle 10 with any point on the inner or outer surface of the crucible; set: the distance between the water jet nozzle 10 and the cleaning surface of the crucible is 6mm; the linear velocity of the crucible 14 is 8mm / sec, the water pressure is 25Pa, the angle between the water jet direction and the cleaning inner and outer wall surfaces is 4°, and the angle between the water jet direction and the inner and outer bottom surfaces is 2°.

[0068] The inner wall, outer wall, inner bottom surface and outer bottom surface of the crucible 14 are cleaned respectively by water jets.

[0069] Complete the first cleaning;

[0070] Step 2: Control the crucible moving system and the flushing and drying system, blow with hot air and room temperature air for 75 seconds each, weigh the mass of the crucible 14 after the first cleaning, record it as m1 grams, accurate to 0.0001 grams.

[0071] Step 3: Repeat step 1 and weigh the mass of the crucible cleaned for the second time, recorded as m2, accurate to 0.0001 g.

[0072] Calculate the difference between m1 and m2. In this embodiment, m1-m2=96.3563-96.3560=0.0003, that is, the difference between m1 and m2 is less than 0.001 grams, and the cleaning is stopped.

[0073] Step 4: Control the crucible moving system and the flushing and air-drying system, flush the crucible 14 with pure water three times, and use cold air and hot air to blow for 80 seconds each to obtain a clean crucible.

[0074] In this embodiment:

[0075] The gripping force of the electric rotating clamp 11 is 3 kg.

[0076] The suction force of the vacuum flip suction cup 15 is 4 kg.

[0077] The heating power of the program-controlled electric hair dryer 12 is 400w.

[0078] The fish tank water pump 17 has a lift of 1000 mm and a flow rate of 150 L / h.

[0079] Example 2

[0080] A method for cleaning a platinum crucible with a water jet polished surface. The platinum crucible cleaning method described in this embodiment is:

[0081] The crucible cleaning method adopts "a water jet platinum crucible cleaning device", writes the size of the crucible 14 into the main control program of the water jet platinum crucible cleaning device, obtains a three-dimensional image of the crucible, and performs the following operations according to the three-dimensional image of the crucible:

[0082] Step 1, follow the steps below: suck the outer bottom or inner bottom of the crucible 14 with the vacuum flip suction cup 15, and align the water jet nozzle 10 with any point on the inner or outer surface of the crucible; set: the distance between the water jet nozzle 10 and the cleaning surface of the crucible is 5mm; the linear velocity of the crucible 14 is 5mm / sec, the water pressure is 20MPa, the angle between the water jet direction and the cleaning inner and outer wall surfaces is 3°, and the angle between the water jet direction and the inner and outer bottom surfaces is -10°.

[0083] The inner wall, outer wall, inner bottom surface and outer bottom surface of the crucible 14 are cleaned respectively by water jets.

[0084] Complete the first cleaning;

[0085] Step 2: Control the crucible moving system and the flushing and air drying system, blow with hot air and room temperature air for 60 seconds each, weigh the mass of the crucible 14 after the first cleaning, and record it as m1 grams. Accurate to 0.0001 grams.

[0086] Step 3: Repeat step 1 and weigh the mass of the crucible cleaned for the second time, recorded as m2, accurate to 0.0001 g.

[0087] Calculate the difference of m1-m2. In this embodiment, m1-m2=65.5243-65.5228=0.0015, that is, the difference of m1-m2>0.001 grams, and it is necessary to continue cleaning;

[0088] Repeat step 1 and weigh the mass of the crucible cleaned for the third time, recorded as m3, accurate to 0.0001 g; in this embodiment: m2-m3=65.5228-655220=0.0008, that is, the difference of m2-m2>0.001 g, and the cleaning is stopped.

[0089] Step 4: Control the crucible moving system and the flushing and air-drying system, flush the crucible 14 with pure water three times, and use cold air and hot air to blow for 600 seconds each to obtain a clean crucible.

[0090] In this embodiment:

[0091] The gripping force of the electric rotating clamp 11 is 1 kg.

[0092] The suction force of the vacuum flip suction cup 15 is 3 kg.

[0093] The heating power of the program-controlled electric hair dryer 12 is 300w.

[0094] The fish tank water pump 17 has a head of 300 mm and a flow rate of 60 L / h.

[0095] The angle range of the electric angular displacement stage 7 is -15.

[0096] Example 3

[0097] A method for cleaning a platinum crucible with a water jet polished surface. The platinum crucible cleaning method described in this embodiment is:

[0098] The crucible cleaning method adopts "a water jet platinum crucible cleaning device", writes the size of the crucible 14 into the main control program of the water jet platinum crucible cleaning device, obtains a three-dimensional image of the crucible, and performs the following operations according to the three-dimensional image of the crucible:

[0099] Step 1, follow the steps below: suck the outer bottom or inner bottom of the crucible 14 with the vacuum flip suction cup 15, and align the water jet nozzle 10 with any point on the inner or outer surface of the crucible; set: the distance between the water jet nozzle 10 and the cleaning surface of the crucible is 7mm; the linear velocity of the crucible 14 is 10mm / sec, the water pressure is 30MPa, the angle between the water jet direction and the cleaning inner and outer wall surfaces is 5°, and the angle between the water jet direction and the inner and outer bottom surfaces is +10°.

[0100] The inner wall, outer wall, inner bottom surface and outer bottom surface of the crucible 14 are cleaned respectively by water jets.

[0101] Complete the first cleaning;

[0102] Step 2: Control the crucible moving system and the flushing and drying system, blow with hot air and room temperature air for 90 seconds each, weigh the mass of the crucible 14 after the first cleaning and record it as m1 grams, accurate to 0.0001 grams.

[0103] Step 3: Repeat step 1 and weigh the mass of the crucible cleaned for the second time, record it as m2, accurate to 0.0001 g.

[0104] Calculate the difference between m1 and m2. In this embodiment, m1-m2 = 75.6789-75.6765 = 0.0024 g, that is, the difference between m1 and m2 is > 0.001 g, and cleaning needs to be continued;

[0105] Repeat step 1, and weigh the mass of the crucible cleaned for the third time as m3, accurate to 0.0001 g; calculate the difference between m2 and m3. In this embodiment, m2-m3=75.6765-75.6750=0.0015 g, that is, the difference between m2 and m3 is still >0.001 g, and further cleaning is required;

[0106] Repeat step 1, and weigh the mass of the crucible cleaned for the fourth time, recorded as m4, accurate to 0.0001 g; calculate the difference between m3 and m4; in this embodiment: m3-m4=75.6750-75.6745=0.0005 g, that is, the difference between m3-m4 is <0.001 g, and the cleaning is stopped.

[0107] Step 4: Control the crucible moving system and the flushing and air-drying system, flush the crucible 14 with pure water three times, and use cold air and hot air to blow for 60 to 90 seconds each to obtain a clean crucible.

[0108] In this embodiment:

[0109] The gripping force of the electric rotating clamp 11 is 5 kg.

[0110] The suction force of the vacuum flip suction cup 15 is 5 kg.

[0111] The heating power of the program-controlled electric hair dryer 12 is 500w.

[0112] The fish tank water pump 17 has a head of 1500 mm and a flow rate of 200 L / h.

[0113] Compared with the prior art, this specific implementation has the following positive effects:

[0114] 1. This specific implementation method utilizes a water jet to grind the molten material remaining on the bottom and wall of the platinum crucible without using any acid. Therefore, the absence of acidic emissions is beneficial to emission reduction. The operation is performed in an environment where no acidic solution is used, which is beneficial to labor protection.

[0115] 2. This specific implementation method utilizes high-pressure water flow to grind the residue and polish the surface of the platinum crucible at the same time, ensuring that the surface of the platinum crucible is smooth, which is conducive to the flow and mixing of the melt, and thus can improve the melting efficiency.

[0116] 3. This specific implementation method evaluates the cleanliness of the platinum crucible by weighing the mass change of the platinum crucible after two consecutive cleaning and polishing, which avoids the platinum crucible being affected by the cleanliness of the previous cleaning when it is used again, thereby reducing contamination errors.

[0117] Therefore, the specific implementation mode has the characteristics of no acidic emissions, being environmentally friendly, being beneficial to labor protection, improving melting efficiency and reducing pollution errors.

Claims

1. A method for cleaning a platinum crucible with a water jet polished surface, characterized in that: The platinum crucible cleaning method is: For simplicity, the platinum crucible to be cleaned is called the crucible; The crucible cleaning method adopts "a water jet platinum crucible cleaning device", writes the size of the crucible (14) into the main control program of the water jet platinum crucible cleaning device, obtains a three-dimensional image of the crucible, and performs the following operations according to the three-dimensional image of the crucible: Step 1, suck the outer bottom or inner bottom of the crucible (14) with a vacuum flip suction cup (15), and align the nozzle (10) with any point on the inner surface or outer surface of the crucible; set: the distance between the water jet nozzle (10) and the cleaning surface of the crucible is 5 to 7 mm; the linear speed of the crucible (14) is 10 to 5 mm / sec, the water pressure is 30 to 20 MPa, the angle between the water jet direction and the cleaning inner wall and outer wall is 3 to 5°, and the angle between the water jet direction and the inner bottom surface and the outer bottom surface is -10 to +10°; Using a water jet to clean the inner wall, outer wall, inner bottom surface and outer bottom surface of the crucible (14) respectively; Complete the first cleaning; Step 2, control the crucible moving system and the flushing and air drying system, blow with hot air and room temperature air for 60 to 90 seconds respectively, weigh the mass of the crucible (14) after the first cleaning, and record it as m1 grams; Step 3, repeat step 1, and weigh the mass of the crucible cleaned for the second time, recorded as m2; Calculate the difference between m1 and m2. When the difference is less than 0.001 g, stop cleaning. When the difference is > 0.001 g, repeat step 1 until the difference is < 0.001 g, and stop cleaning; Step 4: Control the crucible moving system and the flushing and air-drying system, flush the crucible (14) with pure water three times, and use cold air and hot air to blow for 60 to 90 seconds each to obtain a clean crucible.

2. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The water jet platinum crucible cleaning device is composed of a program-controlled water jet system, a crucible moving system and a flushing and air-drying system; The structure of the program-controlled water jet system is as follows: the output shaft of the water jet motor (3) is connected to the input shaft of the high-pressure pump (4); the water jet water tank (1) is connected to the filter screen (2) and the water inlet end of the high-pressure pump (4) through a water pipe; the water outlet end of the high-pressure pump (4) is connected to the water inlet end of the water jet nozzle (10); and the water jet nozzle (10) is fixed directly above the electric lifting column (5) through a fixing plate; The structure of the crucible moving system is as follows: the top of the electric lifting column (5) is fixedly connected to the lower surface of the bottom of the flat plate (6); the upper parts of the front and rear sides of the electric angular displacement platform (7) are respectively hinged to the bottoms of the front and rear sides of the guide rail (8) through corresponding connecting rods; the electric slider (9) is slidably connected to the guide rail (8); the bottom of the electric rotating clamp (11) is fixedly connected to the upper plane of the electric slider (9); the electric lifting column (5) is directly driven by a lifting DC motor; the electric angular displacement platform (7) and the electric slider (9) are directly driven by their own DC programmable motors; the maximum distance that the electric slider (9) moves to the right along the guide rail (8) is 80 to 110 mm; and the inclination angle of the guide rail (8) is 0 to 30 degrees; The structure of the flushing and air-drying system is as follows: the air nozzle (13) of the programmable electric heating hair dryer (12) is installed just above the vacuum flip sucker (15), the distance between the air nozzle (13) and the rotating shaft of the vacuum flip sucker (15) is 50-100 mm, a pure water nozzle (16) is arranged just below the vacuum flip sucker (15), and the pure water nozzle (16) is connected to a pure water tank (18) through a fish tank water pump (17); the distance between the axis of the air nozzle (13) and the upper plane of the vacuum flip sucker (15) is 50-100 mm, and the distance between the mouth of the pure water nozzle (16) and the upper plane of the vacuum flip sucker (15) is 50-100 mm.

3. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The crucible (14) is a platinum crucible for melting samples for chemical analysis.

4. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The water pressure of the water jet nozzle (10) is 10-30 MPa.

5. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The electric rotating clamp (11) can rotate infinitely 360 degrees and the rotation speed can be adjusted by program control; the gripping force is 1 to 5 kg.

6. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The suction force of the vacuum flip suction cup (15) is 3-5 kg.

7. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The heating power of the program-controlled electric heating hair dryer (12) is 300-500w.

8. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The fish tank water pump (17) has a head of 300 to 1500 mm and a flow rate of 60 to 200 L / h.

9. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The precision of the analytical balance is 0.1 mg.

10. The method for cleaning a platinum crucible with a water jet polished surface according to claim 1, characterized in that: The angle range of the electric angular displacement stage (7) is ±15°.

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