Quantitative cleaning system for steel raw material with fixed dilution ratio

Abstract

The application discloses a steel raw material quantitative cleaning system with a fixed dilution ratio, which comprises a supporting outer frame and a PLC control system, a touch control screen is embedded on the front panel of the supporting outer frame, a multifunctional sample in-out buffer table is arranged on the inner front side of the supporting outer frame, a transfer table is fixedly arranged on the rear side of the supporting outer frame, and grooves for positioning crucibles and molds are arranged on the transfer table. The application has the beneficial effects that: the independent internal standard coarse adding mechanism and the screw rod fine adding device are arranged to realize segmented fast and slow feeding, the micro internal standard weighing error is reduced to less than or equal to 1 mg, the volumetric quantitative dropping of the oxidizing agent and the demolding agent is carried out by using the precise injection pump, the single drop volume repeatability error is less than 1%, and the consistency of the additive is significantly improved; the quantitative module and the cleaning module share the PLC control system and are provided with an automatic backflow conveying sliding table, so that the weighing-cleaning internal closed loop circulation is formed, and more than 100 pieces of molten pieces can be stably prepared in 8 hours.

Description

Technical Field

[0001] This invention relates to the field of sample preparation technology, and specifically to a quantitative cleaning system for steel raw materials using a fixed dilution ratio. Background Technology

[0002] One of the core methods is the glass fusion method. This method involves mixing powdered samples with flux in a certain proportion, heating and melting the mixture at high temperature, and then casting it into a uniform glass sheet. This effectively eliminates mineral particle size effects and mineral effects, significantly improving the accuracy of XRF analysis. Therefore, it has been widely used in the chemical composition detection of iron ore, limestone, and other steel raw materials.

[0003] Currently, quantitative cleaning equipment used for XRF glass sheet preparation is mainly divided into two categories: separate independent equipment and integrated complete machine.

[0004] I. Split-type independent quantitative cleaning equipment In existing split-type equipment, the metering unit and the cleaning unit are set up in separate cabinets, each equipped with an independent PLC control system and operating interface. After metering, the crucible needs to be transferred to the cleaning unit via an external transfer device or manually. This solution has the following drawbacks: The quantitative unit is only equipped with a single-channel internal standard feeding mechanism, which cannot achieve segmented fast and slow feeding. Since the amount of cobalt internal standard added is often only tens of milligrams, a single screw feeder cannot balance feeding speed and weighing accuracy. The weighing deviation of trace internal standards is relatively large, which directly affects the accuracy of XRF elemental detection using the cobalt internal standard method.

[0005] The release agent and oxidant are simply added by ordinary solenoid valve without a volumetric metering pump. The volume repeatability of a single drop is poor, and the amount of additives added between batches is highly variable. Problems such as incomplete oxidation and demolding breakage of the melt sheet are easy to occur, and the sheet yield is difficult to guarantee.

[0006] The quantitative unit and the cleaning unit are arranged separately, without an integrated collaborative control architecture. The cleaned crucible and mold need to be transported over long distances by robots repeatedly. The process is time-consuming, the cycle time cannot be automatically matched, the sample preparation efficiency is limited, and the stable sample preparation volume of 8 hours is difficult to meet the needs of large-scale testing.

[0007] The sample buffer station can only hold sample cups and does not have a dedicated storage area for platinum crucibles and casting molds. Operators need to transport precious metal consumables separately, which is prone to bumps and damage, increasing the cost of consumable procurement and maintenance.

[0008] The lack of a closed internal conveying channel for material transfer makes it easy for flux and sample powder residues on the outer wall of the crucible to fall off, causing cross-contamination between workstations, altering the standard dilution ratio, and reducing the repeatability of elemental detection data.

[0009] II. Integrated Fusing Sheet Sample Preparation Machine Existing technologies also include integrated solutions that combine the quantitative unit, cleaning unit, and high-frequency melting furnace into a single cabinet, such as the fully automated MLD melting system known in the art. While such equipment offers improved integration, it still has significant shortcomings: The high temperature, corrosive fumes, and water vapor generated by melting continuously invade the high-precision weighing area. The balance operates in a harsh environment for a long time, causing the weighing accuracy to drift continuously. Frequent shutdowns for calibration are required, increasing the workload of maintenance.

[0010] The internal standard still uses only a single screw feeder, and the problem of large errors in micro-weighing has not been effectively solved.

[0011] The problem of poor repeatability of liquid additives due to the lack of an independent injection pump still exists.

[0012] There is no dedicated internal closed-loop conveying channel between quantitative and cleaning processes, the material transfer path is long, and the problem of cross-contamination has not been improved.

[0013] Furthermore, regardless of whether it is a split-type or integrated solution, the quantitative unit is not equipped with a locked standard fixed dilution ratio program, which makes the weighing values ​​of the sample and flux prone to fluctuations. Problems such as bubbles, crystallization, and component segregation are likely to occur inside the melt. The test data is difficult to stably meet the error requirements of national standards such as GB / T 6730.87 and GB / T 3286.11.

[0014] To address the shortcomings of the prior art, this invention provides a quantitative cleaning system and method for steel raw materials using a fixed dilution ratio. Summary of the Invention

[0015] The purpose of this invention is to address the shortcomings and defects of the existing technology by providing a quantitative cleaning system for steel raw materials using a fixed dilution ratio.

[0016] To achieve the above objectives, the present invention adopts the following technical solution: a quantitative cleaning system for steel raw materials using a fixed dilution ratio, comprising a supporting outer frame and a PLC control system. A touch control screen is embedded in the front panel of the supporting outer frame, and a multi-functional sample inlet / outlet buffer is provided on the front inner side of the supporting outer frame. A transfer platform is fixedly installed on the rear outer side of the supporting outer frame, and the transfer platform has grooves for positioning crucibles and molds. An automatic quantitative module, an ultrasonic cleaning and drying module, and a multi-axis conveying module are respectively provided on the left and right sides inside the supporting outer frame, with the multi-axis conveying module located between the automatic quantitative module and the ultrasonic cleaning and drying module. The automatic quantitative module includes an automatic weighing device for real-time weighing of materials, an internal standard coarse addition mechanism for rapidly adding internal standards at a first speed, and a screw fine feeding device as the internal standard fine addition... The system includes a feeding mechanism for adding internal standards in minute quantities at a second speed, which is less than the first speed; an automatic release agent dripping device, including a precision injection pump, for volumetric quantitative dripping of oxidant and / or release agent; a first flux tank and a second flux tank, positioned above the automatic metering module, for storing fluxes of different proportions respectively; an automatic flux adding device, positioned on one side of the first and second flux tanks, for quantitatively conveying the flux in the tanks to the crucible; the automatic metering module and the ultrasonic cleaning and drying module share a PLC control system, and the discharge end of the ultrasonic cleaning and drying module is equipped with an automatic reflux conveying slide, which automatically conveys the cleaned and dried crucible and mold to the feeding station of the automatic metering module, forming an internal closed-loop cycle of weighing-cleaning.

[0017] Furthermore, the multifunctional sample loading and unloading buffer platform has a three-tiered structure: the top layer is a crucible placement platform with multiple crucible storage positions for vertically placing empty platinum crucibles and empty casting molds; the middle layer is a molten sheet placement platform with multiple molten sheet buffer trays for placing prepared glass molten sheets, and is equipped with an automatic label printer; the bottom layer has a lower raw material placement platform and an upper raw material placement platform, with the lower raw material placement platform located below the upper raw material placement platform, and the lower and upper raw material placement platforms are staggered, each with multiple storage positions for placing powder sample cups; the multifunctional sample loading and unloading buffer platform includes side support rods, and the upper raw material placement platform, molten sheet placement platform, and crucible placement platform are all mounted on the side support rods; the lower end of the lower raw material placement platform has triangular connecting frames on both sides, and the lower raw material placement platform is fixed to the supporting outer frame through the triangular connecting frames.

[0018] Furthermore, the automatic quantitative module also includes: an automatic sample adding device for turning over the powder sample in the sample cup and pouring it into the crucible; an automatic mixing device for high-speed rotating and uniformly mixing the sample, flux, internal standard, oxidant and release agent in the crucible; and a bottle heightening support set on one side of the automatic mixing device for supporting the release agent reagent bottle.

[0019] Furthermore, the coarse internal standard addition mechanism is a large-lead screw feeding device, and the fine screw feeding device is a small-pitch micro-screw feeding device; the PLC control system is configured to: when the difference between the real-time internal standard weight fed back by the automatic weighing device and the target internal standard weight is greater than a preset threshold, start the coarse internal standard addition mechanism for rapid feeding; when the difference is not greater than the preset threshold, stop the coarse internal standard addition mechanism and start the fine screw feeding device for low-speed micro-feeding.

[0020] Furthermore, the automatic release agent dripping device includes two independent precision injection pumps, which are used for the volumetric quantitative dripping of the oxidant and the release agent, respectively; each precision injection pump controls the push rod stroke through a stepper motor, and the PLC control system has pre-stored single dripping volume parameters and dripping number parameters.

[0021] Furthermore, the ultrasonic cleaning and drying module includes: a mounting base plate, fixedly installed inside the supporting outer frame; a cleaning and drying main body, installed above the mounting base plate, with an ultrasonic heating cleaning tank, a spray rinsing tank, and a hot air drying tank arranged sequentially in the horizontal direction; a transport and traversing assembly, installed above the cleaning and drying main body, which uses an electromagnet to attract cleaning racks and reciprocates horizontally between the various workstations of the cleaning and drying main body in the left-right direction; a cleaning rack placement assembly, installed below one end of the transport and traversing assembly, and equipped with a crucible cleaning rack containing crucibles and a mold cleaning rack containing molds, the crucible cleaning rack and the mold cleaning rack being arranged side by side on the cleaning rack placement assembly; a water-gas separation box assembly, installed at the bottom of the mounting base plate, used to collect and treat waste liquid and waste gas generated during the cleaning process; a first wiring groove is provided on the right side above the mounting base plate, and a second wiring groove is provided at the front end of the mounting base plate.

[0022] Furthermore, the automatic reflux conveying slide is positioned between the discharge end of the hot air drying tank and the feeding station of the automatic metering module. The PLC control system reads the amount of clean crucibles on the reflux slide in real time. When the available crucible inventory is lower than the preset value, the automatic metering module automatically pauses the metering process until the reflux material is replenished.

[0023] Furthermore, the PLC control system has pre-stored locked fixed dilution formulas for multiple types of materials. Each formula corresponds to a fixed addition mass of sample, flux, internal standard, oxidant and release agent. The formula parameters remain locked and unchanged during system operation.

[0024] Furthermore, the multi-axis handling module is a six-joint industrial robot, whose end effector integrates a pneumatic gripper and a vacuum suction cup; the pneumatic gripper is used to grip cups, crucibles and molds, and the vacuum suction cup is used to pick up glass flakes.

[0025] A quantitative cleaning method for steel raw materials using a fixed dilution ratio includes the following steps: Empty crucibles, empty molds, and sample cups are placed at their respective stations on a multi-functional sample inlet / outlet buffer platform; the material type is selected and sample number is entered via a touch control screen; a multi-axis transport module transports the empty crucible to the automatic weighing device of the automatic quantitative module, and the system automatically retrieves the corresponding locked fixed dilution formula; the sample and flux are weighed and added to the crucible according to a preset ratio; the internal standard addition process is initiated, with the internal standard coarse addition mechanism quickly dispensing the material, switching to a screw fine addition device for micro-feeding when the real-time weight approaches the target internal standard weight, stopping once the target value is reached; the precision injection pump of the automatic release agent dripping device operates according to a preset stroke. Oxidizing agent and release agent are added dropwise; the automatic mixing device rotates at high speed to ensure that all materials in the crucible are thoroughly and evenly mixed; the multi-axis conveying module transports the prepared crucible to the transfer station, where an external robot picks it up and sends it to an external high-frequency melting furnace for melting; after melting, the external robot returns the empty crucible and the mold with the molten sheet to the transfer station, and the multi-axis conveying module transfers the molten sheet to the molten sheet placement platform of the multi-functional sample buffer station and automatically prints a label, and sends the empty crucible and mold to the ultrasonic cleaning and drying module; the ultrasonic cleaning and drying module sequentially completes ultrasonic heating cleaning, spray rinsing, and hot air drying, and the cleaned crucible and mold are transported to the feeding station of the automatic quantitative module through an automatic return conveyor slide for use in the next cycle.

[0026] After adopting the above technical solution, the beneficial effects of the present invention include at least the following points: 1. This invention achieves segmented, dual-speed feeding by setting up an independent internal standard coarse addition mechanism and a screw fine feeding device. The coarse addition mechanism rapidly feeds the material to near the target value, then switches to a small-pitch screw fine feeding device for micro-feeding, ensuring that the internal standard weighing error is ≤1mg, while the flux addition accuracy reaches ±0.004g. Although the absolute accuracy of sample addition is ±0.02g, this invention maintains a constant ratio of sample, flux, and internal standard through a fixed dilution ratio locking mechanism. This ensures that the final concentration of the analyte in the glass melt is not affected by fluctuations in a single weighing, thus meeting the accuracy requirements of the national standards GB / T6730.87 and GB / T 3286.11.

[0027] 2. This invention uses two independent precision injection pumps for the volumetric quantitative addition of oxidant and release agent, respectively, and a stepper motor to precisely control the push rod stroke. The single drop volume repeatability error is <1%, and the amount of additives added in each batch is highly uniform. This effectively avoids the problems of incomplete oxidation and demolding damage caused by the discrete amount of additives added, and the sheet forming qualification rate is stable at ≥90%.

[0028] 3. This invention integrates the automatic quantitative module and the ultrasonic cleaning and drying module into the same supporting outer frame, sharing a single PLC control system. The cleaning module's discharge end is equipped with an automatic return conveyor slide that automatically transports the clean crucible and mold to the quantitative module's feeding station, constructing a complete weighing-cleaning internal closed-loop cycle. This eliminates the material transfer steps in separate equipment, enabling the stable preparation of more than 100 fused sheets in 8 hours, significantly improving sample preparation efficiency.

[0029] 4. The present invention features a sealed partition inside the outer frame to physically isolate the high-precision weighing area from the cleaning wet area. At the same time, the system does not have a built-in high-frequency melting furnace. The melting process is completed by external equipment through a transfer station, which completely isolates the weighing area from high temperature, corrosive fumes and water vapor. The balance has a stable working environment over a long period of time, and the weighing accuracy does not drift significantly, greatly reducing the frequency of downtime for calibration.

[0030] 5. In this invention, the materials flow entirely within the closed support frame. The entire process, from quantitative batching, transfer and delivery, external melting to cleaning and reflux, is completed in a closed environment. Residual powder and residue on the outer wall of the crucible are confined to the cleaning module for processing. There is no cross-contamination between workstations, avoiding impurities from interfering with the standard dilution ratio and improving the repeatability of test data.

[0031] 6. The multifunctional sample loading and unloading buffer of this invention adopts a three-layer stepped structure. The upper layer is a crucible loading platform, the middle layer is a molten sheet loading platform, and the bottom layer is equipped with staggered lower and upper raw material loading platforms. It can simultaneously store powder sample cups, platinum crucibles and casting molds, without the need for additional precious metal storage fixtures, reducing consumable damage caused by manual handling and bumps, and lowering long-term consumable procurement costs.

[0032] 7. This invention uses a single PLC control system and touch screen for both quantitative and cleaning processes. Fixed dilution formulas, internal standard coarse / fine feeding parameters, syringe pump dripping parameters, and cleaning process parameters are uniformly stored and managed, making equipment debugging and troubleshooting centralized and convenient. The PLC obtains the clean crucible inventory on the reflux slide in real time and automatically adjusts the quantitative operation rhythm, preventing quantitative material shortages or material accumulation during cleaning. The overall system efficiency is ≥99%. The multi-axis handling module uses a six-joint industrial robot and integrates pneumatic grippers and vacuum suction cups, enabling the simultaneous handling of multiple materials and providing strong automated continuous operation capabilities. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the present invention.

[0035] Figure 2 This is a second-angle schematic diagram of the invention.

[0036] Figure 3 Based on Figure 1 A schematic diagram of the internal structure.

[0037] Figure 4 yes Figure 1 The corresponding front view structural diagram.

[0038] Figure 5 yes Figure 3 The corresponding top-view structural diagram.

[0039] Figure 6 This is a schematic diagram of the automatic quantitative module in this invention.

[0040] Figure 7 This is a second-angle schematic diagram of the automatic quantitative module in this invention.

[0041] Figure 8 yes Figure 6 The corresponding top-view structural diagram.

[0042] Figure 9 yes Figure 6 The corresponding front view structural diagram.

[0043] Figure 10 This is a schematic diagram of the structure of the ultrasonic cleaning and drying module in this invention.

[0044] Figure 11 This is a second-angle schematic diagram of the ultrasonic cleaning and drying module in this invention.

[0045] Figure 12 yes Figure 10 The corresponding front view structural diagram.

[0046] Figure 13 yes Figure 10 The corresponding top-view structural diagram.

[0047] Figure 14 This is a schematic diagram of the structure of the multifunctional sample input / output buffer station in this invention.

[0048] Figure 15 yes Figure 14 The corresponding front view structural diagram.

[0049] Figure 16 yes Figure 14 The corresponding top-view structural diagram.

[0050] Figure reference numerals: 1. Multi-axis conveying module; 2. Automatic quantitative module; 3. Ultrasonic cleaning and drying module; 4. Multifunctional sample loading and unloading buffer platform; 5. Transfer platform; 6. Supporting outer frame; 7. Touch control screen; 8. Automatic release agent dripping device; 9. Automatic mixing device; 10. Bottle raising support; 21. Automatic sample adding device; 22. Automatic weighing device; 23. First flux tank; 24. Screw fine feeding device; 25. Second flux tank; 26. Automatic flux adding device; 27. Conveying and traversing assembly; 38. Mold cleaning rack; 39. Crucible cleaning rack; 30. Cleaning rack placement assembly; 31. Second wiring trough; 32. Water-air separation box assembly; 33. Cleaning and drying main body; 34. Mounting base plate; 35. First wiring trough; 46. Side support rod; 47. Triangular connecting frame; 48. Lower raw material placement platform; 49. Upper raw material placement platform; 40. Storage position; 41. Melt sheet placement platform; 42. Crucible placement platform; 43. Crucible storage position. Detailed Implementation

[0051] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0052] Example 1: A quantitative cleaning system for steel raw materials using a fixed dilution ratio like Figures 1 to 5 As shown, the present invention provides a quantitative cleaning system for steel raw materials with a fixed dilution ratio, including a supporting outer frame 6, a touch control screen 7, a multi-functional sample inlet and outlet buffer station 4, an automatic quantitative module 2, an ultrasonic cleaning and drying module 3, a transfer station 5, and a multi-axis conveying module 1.

[0053] The supporting outer frame 6 is a corrosion-resistant welded steel frame structure with a sealed partition inside, physically isolating the high-precision weighing area where the automatic quantitative module 2 is located from the cleaning wet area where the ultrasonic cleaning and drying module 3 is located, as well as the external transfer area where the transfer station 5 is located. A touch control screen 7 is embedded in the front panel of the supporting outer frame 6 for unified management of fixed dilution formulas, internal standard feeding parameters, syringe pump dripping parameters, and cleaning process parameters. The automatic quantitative module 2 automatically weighs and adds samples, flux, internal standard, oxidant, and release agent according to a preset fixed dilution ratio; the ultrasonic cleaning and drying module 3 cleans, dries, and reflows the crucibles and molds after melting and use.

[0054] like Figure 1, Figure 2 As shown, the multi-functional sample inlet / outlet buffer station 4 is located inside the front side of the supporting outer frame 6. The transfer station 5 is fixedly located on the rear outside of the supporting outer frame 6, used for material exchange with an external high-frequency melting furnace and an external robot. The transfer station 5 has grooves for positioning crucibles and molds. An automatic metering module 2 is located on one side of the interior of the supporting outer frame 6, and an ultrasonic cleaning and drying module 3 is located on the other side. A multi-axis conveying module 1 is located between the automatic metering module 2 and the ultrasonic cleaning and drying module 3. The multi-functional sample inlet / outlet buffer station 4 is used to simultaneously store raw material cups, empty platinum crucibles, and empty casting molds; the transfer station 5 is used for material exchange with an external high-frequency melting furnace and an external robot. The transfer station 5 has grooves for positioning crucibles and molds. like Figure 3 As shown, the multi-axis handling module 1 is a six-joint industrial robot. Its base is fixed to the central base plate inside the supporting outer frame 6. Its working radius covers the material handling positions of the multi-functional sample inlet / outlet buffer station 4, the automatic metering module 2, the ultrasonic cleaning and drying module 3, and the transfer station 5. The end effector of the multi-axis handling module 1 integrates a pneumatic gripper and a vacuum suction cup; the pneumatic gripper is used to grip cups, crucibles, and molds, while the vacuum suction cup is used to pick up glass flakes. The multi-axis handling module 1 is used to transfer materials between the multi-functional sample inlet / outlet buffer station 4, the automatic metering module 2, the ultrasonic cleaning and drying module 3, and the transfer station 5. 1. Multifunctional sample loading and unloading buffer station like Figures 14 to 16 As shown, the multi-functional sample loading and unloading buffer station 4 has a three-layer stepped structure.

[0055] The top layer is a crucible placement platform 47, which has multiple crucible storage positions 48 for vertically placing empty platinum crucibles and empty casting molds. The middle layer is a molten sheet placement platform 46, which has multiple molten sheet buffer trays for placing prepared glass molten sheets and is equipped with an automatic label printer. The bottom layer has a lower raw material placement platform 43 and an upper raw material placement platform 44. The lower raw material placement platform 43 is located below the upper raw material placement platform 44, and the lower raw material placement platform 43 and the upper raw material placement platform 44 are staggered on the same layer. Both the upper raw material placement platform 44 and the lower raw material placement platform 43 have multiple storage positions 45 for placing powder sample cups ground to ≤75μm. Each storage position 45 is equipped with an independent proximity switch for real-time identification of three states: no material, empty material, and with material.

[0056] The multi-functional sample loading and unloading buffer platform 4 also includes a side support rod 41. The upper raw material loading platform 44, the melt loading platform 46, and the crucible loading platform 47 are all mounted on the side support rod 41. The lower raw material loading platform 43 has triangular connecting brackets 42 on both sides of its lower end. The lower raw material loading platform 43 is fixed to the supporting outer frame 6 through the triangular connecting brackets 42.

[0057] 2. Automatic Quantitative Module like Figures 6 to 9 As shown, the automatic quantitative module 2 is fixedly installed inside the supporting outer frame 6 on one side, adjacent to the rear of the multi-functional sample inlet / outlet buffer platform 4. It is used to automatically weigh and add samples, flux, internal standard, oxidant, and release agent according to a preset fixed dilution ratio. The automatic quantitative module 2 includes an automatic weighing device 25, an internal standard coarse addition mechanism, a screw fine feeding device 27, an automatic release agent dripping device 21, a first flux tank 26, a second flux tank 28, an automatic flux adding device 29, an automatic sample adding device 24, an automatic mixing device 22, and a bottle heightening support 23.

[0058] The automatic weighing device 25 adopts a Mettler WKC204C high-precision balance. The balance body is fixed on the quantitative moving platform, which is slidably connected to the horizontal guide rail. Driven by a stepper motor, it moves back and forth between the feeding position, the first flux position, and the second flux position to weigh the material in real time.

[0059] like Figure 6 , Figure 8 As shown, the first flux tank 26 and the second flux tank 28 are arranged side by side above the automatic metering module 2, and are used to store fluxes with different proportions respectively. An automatic flux adding device 29 is located on one side of the first flux tank 26 and the second flux tank 28, and is used to quantitatively deliver the flux from the tanks to the crucible. Specifically, the automatic flux adding device 29 includes a feeding screw and a drive motor. Its inlet is connected to the lower end of the tank through a pipeline, and its outlet extends above the automatic weighing device 25 through a feeding pipe. During feeding, the cylinder plug retracts, and the feeding screw rotates under the drive motor, quantitatively delivering the flux from the tank to the crucible. The screw speed is controlled in real time according to the feedback value from the automatic weighing device 25 to achieve high-precision adding.

[0060] The coarse internal standard addition mechanism and the screw fine feeding device 27 are independently arranged above the automatic weighing device 25, and the discharge ports of both are aligned with the crucible station on the automatic weighing device 25. The coarse internal standard addition mechanism is a large-lead screw feeding device, used to quickly add internal standard at a first speed. The screw fine feeding device 27 is a small-pitch micro-screw feeding device, serving as the fine internal standard addition mechanism, used to add internal standard in small amounts at a second speed, which is less than the first speed.

[0061] like Figure 6 , Figure 7 , Figure 9As shown, the automatic sample adding device 24 is set at the loading position of the corresponding quantitative moving platform to flip the powder sample in the sample cup into the crucible. Specifically, the automatic sample adding device 24 consists of a flipping sample unloading mechanism, a bottom cylinder, and a rotary cutting stepper motor. The flipping shaft is horizontally set, and its rotation output end is connected to a rotary unloading plate; the cylinder body of the bottom cylinder is fixed on the support frame, and its telescopic end is connected to the flipping shaft; the output shaft of the rotary cutting stepper motor is connected to a cutting blade. In the initial state, the bottom cylinder is in the retracted state, and the flipping shaft is in the horizontal pick-and-place position. When the multi-axis conveying module 1 places the sample cup on the rotary unloading plate of the automatic sample adding device 24, the suction cup uses negative pressure to hold the sample cup, the flipping motor flips to the middle position, the bottom cylinder extends to align the cup opening with the crucible on the automatic weighing device 25, and the rotary cutting motor reverses to unload the sample. If the amount of material added during the unloading process is less than the set threshold within a set time, the system automatically increases the tilt angle until the target weight is reached.

[0062] like Figure 6 , Figure 9 As shown, the automatic release agent dispensing device 21 is located on one side of the automatic metering module 2, and includes two independent precision injection pumps for volumetric metering dispensing of the oxidant and release agent, respectively. Each precision injection pump controls the push rod stroke via a stepper motor to achieve volumetric metering delivery. The suction port of the precision injection pump is connected to a buffer bottle via a switching valve, and the discharge port is connected to a dispensing needle via a switching valve. When not dispensing, the needle is retracted into the overflow bottle by a cylinder to prevent crystallization and blockage.

[0063] like Figures 6 to 9 As shown, the automatic mixing device 22 consists of a rotary brake motor and a crucible holder, and is located next to the unloading station of the automatic weighing device 25. It is used to mix the sample, flux, internal standard, oxidant, and release agent in the crucible at high speed. After all the materials have been added, the multi-axis conveying module 1 clamps the crucible to the automatic mixing device 22, and the rotary brake motor rotates at a high speed of 1800 rpm to fully mix the materials. Then it rotates back to the original position to be picked up.

[0064] The bottle heightening support 23 is set on one side of the automatic mixing device 22 to support the mold release agent reagent bottle, ensuring that the liquid outlet of the reagent bottle is higher than the liquid suction port of the precision injection pump, so as to facilitate smooth liquid supply.

[0065] 3. Ultrasonic cleaning and drying module like Figures 10 to 13As shown, the ultrasonic cleaning and drying module 3 is fixedly installed on the other side inside the supporting outer frame 6, and is used to clean, dry, and recirculate the crucibles and molds after melting and use. The ultrasonic cleaning and drying module 3 includes a mounting base plate 38, a cleaning and drying main body 37, a transport and traversing assembly 31, a cleaning rack placement assembly 34, a crucible cleaning rack 33, a mold cleaning rack 32, a water-air separation box assembly 36, a first wiring trough 39, and a second wiring trough 35.

[0066] The mounting base plate 38 is fixedly installed inside the supporting outer frame 6. The cleaning and drying main body 37 is located above the mounting base plate 38, and consists of an ultrasonic heating cleaning tank, a spray rinsing tank, and a hot air drying tank arranged sequentially in the horizontal direction. The ultrasonic heating cleaning tank is equipped with a heating tube and an ultrasonic transducer at the bottom, and is also equipped with a float level gauge. It uses 10% citric acid cleaning agent and the heating temperature is 80℃. The spray rinsing tank is connected to a tap water spray pipeline and a compressed air purging pipeline. The hot air drying tank is equipped with a heating fan at the bottom, the drying temperature is 100℃, and it is also equipped with a compressed air cooling pipeline.

[0067] like Figure 10 As shown, the transport and traversing assembly 31 is located above the cleaning and drying body 37 and includes a servo motor, a linear module, a traversing robotic arm cylinder and an electromagnet. The electromagnet attracts the cleaning rack and traverses back and forth in the left and right direction between each station of the cleaning and drying body 37.

[0068] The cleaning rack placement assembly 34 is located below one end of the transport and traversing assembly 31. A crucible cleaning rack 33 containing crucibles and a mold cleaning rack 32 containing molds are placed on the cleaning rack placement assembly 34. The crucible cleaning rack 33 and the mold cleaning rack 32 are arranged side-by-side on the cleaning rack placement assembly 34. The bottom of the crucible cleaning rack 33 and the mold cleaning rack 32 are provided with ferromagnetic attraction parts. The electromagnet of the transport and traversing assembly 31 uses these ferromagnetic attraction parts to pick up and place the cleaning racks.

[0069] like Figure 11 , Figure 13 As shown, the water-air separation box assembly 36 is located at the bottom of the mounting base plate 38 and is used to collect and treat waste liquid and waste gas generated during the cleaning process. A first wiring trough 39 is provided on the right side above the mounting base plate 38, and a second wiring trough 35 is provided at the front end of the mounting base plate 38 for arranging the internal electrical wiring of the module.

[0070] The ultrasonic cleaning and drying module 3 has an automatic return conveyor slide at its discharge end. This slide is located between the discharge end of the hot air drying tank and the feeding station of the automatic metering module 2, and is equipped with a belt conveyor or chain conveyor. It belongs to the ultrasonic cleaning and drying module 3. This return slide automatically transports the cleaned and dried crucibles and molds to the feeding station of the automatic metering module 2, forming a closed-loop weighing-cleaning cycle.

[0071] 4. PLC Control System The automatic quantitative module 2 and the ultrasonic cleaning and drying module 3 share a PLC control system, which uses a Siemens S7-1200 PLC.

[0072] The PLC control system is configured to: when the difference between the real-time internal standard weight fed back by the automatic weighing device 25 and the target internal standard weight is greater than a preset threshold, activate the internal standard coarse addition mechanism for rapid feeding; when the difference is not greater than the preset threshold, stop the internal standard coarse addition mechanism and activate the screw fine feeding device 27 for low-speed micro-feeding. The preset threshold is 0.5g.

[0073] The PLC control system has pre-stored parameters for the volume and number of drops per cycle, which are used to control the stepper motor stroke of the precision injection pump.

[0074] The PLC control system has pre-stored locked fixed dilution formulas for multiple types of materials. Each formula corresponds to a fixed addition mass of sample, flux, internal standard, oxidant and release agent. The formula parameters remain locked and unchanged during system operation.

[0075] The PLC control system reads the inventory of clean crucibles on the reflux slide in real time. When the available crucible inventory is lower than the preset value, the automatic metering module 2 automatically pauses the metering process until the reflux material is replenished.

[0076] 5. System Workflow The method for quantitative cleaning of steel raw materials using the above system includes the following steps: S1: The operator places the empty crucible, empty mold, and sample cup into the corresponding workstations of the multi-functional sample inlet / outlet buffer station 4. The crucible is placed in the crucible storage position 48, the mold is placed in the corresponding storage position, and the sample cup is placed in the storage position 45. The operator then selects the material type and enters the sample number through the touch control screen 7.

[0077] S2: The multi-axis transport module 1 transports the empty crucible to the automatic weighing device 25 of the automatic quantitative module 2, and the system automatically retrieves the corresponding locked fixed dilution formula.

[0078] S3: The system weighs and adds the sample and flux to the crucible in sequence according to the preset ratio. The flux is quantitatively delivered from the first flux tank 26 or the second flux tank 28 via the automatic flux adding device 29.

[0079] S4: Inner standard addition process starts: First, the inner standard coarse addition mechanism (large lead screw) quickly feeds the material. When the difference between the real-time inner standard weight fed back by the automatic weighing device 25 and the target inner standard weight reaches the preset threshold of 0.5g, the screw fine feeding device 27 is switched to perform micro-feeding. The process stops after the target value is reached.

[0080] S5: The two precision injection pumps of the automatic release agent dripping device 21 drip the oxidant and release agent quantitatively according to the preset stroke.

[0081] S6: The multi-axis conveying module 1 clamps the crucible to the automatic mixing device 22, and the high-speed rotation ensures that the materials in the crucible are fully mixed evenly.

[0082] S7: The multi-axis conveying module 1 transports the crucible with the prepared ingredients to the positioning groove of the transfer platform 5, where it is picked up by an external robot and sent to an external high-frequency melting furnace for melting.

[0083] S8: After melting is complete, the external robot returns the empty crucible and the mold with the molten sheet to the transfer station 5. The multi-axis handling module 1 transfers the molten sheet to the molten sheet placement platform 46 of the multi-functional sample buffer station 4 and automatically prints a label, and sends the empty crucible and mold into the cleaning rack placement assembly 34 of the ultrasonic cleaning and drying module 3.

[0084] S9: The transport transverse component 31 uses an electromagnet to attract the cleaning rack, sequentially immersing it in an ultrasonic heating cleaning tank (80℃, 10% citric acid cleaning agent), a spray rinsing tank (tap water spray and compressed air purging), and a hot air drying tank (100℃ hot air drying and cooling) to complete the cleaning and drying process. The cleaned crucibles and molds are automatically transported to the feeding station of the automatic quantitative module 2 via an automatic return conveyor slide for use in the next cycle.

[0085] Throughout the process, the PLC control system monitors the status of each module in real time and automatically coordinates the operating rhythm: when it detects that the clean crucible on the reflux slide is insufficient, it automatically pauses the quantitative process and waits; when the reflux material is replenished, it automatically resumes the quantitative operation.

[0086] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A quantitative cleaning system for steel raw materials using a fixed dilution ratio, characterized in that: The system includes a supporting outer frame (6) and a PLC control system. A touch control screen (7) is embedded in the front panel of the supporting outer frame (6), and a multi-functional sample loading and unloading buffer platform (4) is provided on the front side of the interior of the supporting outer frame (6). A transfer platform (5) is fixedly installed on the rear side of the supporting outer frame (6). The transfer platform (5) has grooves for positioning crucibles and molds. An automatic quantitative module (2), an ultrasonic cleaning and drying module (3), and a multi-axis conveying module (1) are respectively provided on the left and right sides inside the supporting outer frame (6). The multi-axis conveying module (1) is located between the automatic quantitative module (2) and the ultrasonic cleaning and drying module (3). The automatic quantitative module (2) includes an automatic weighing device (25) for weighing the material in real time and an internal standard coarse addition mechanism for rapidly adding internal standards at a first speed. The screw precision feeding device (27), as an internal standard precision adding mechanism, is used to add internal standards in small amounts at a second speed, the second speed being less than the first speed; Automatic mold release agent dispensing device (21), including a precision injection pump for volumetric quantitative dispensing of oxidant and / or mold release agent; The first flux tank (26) and the second flux tank (28) are located above the automatic metering module (2) and are used to store fluxes with different ratios respectively. An automatic flux addition device (29) is installed on one side of the first flux tank (26) and the second flux tank (28) to quantitatively transfer the flux in the tank to the crucible. The automatic quantitative module (2) and the ultrasonic cleaning and drying module (3) share a PLC control system. The discharge end of the ultrasonic cleaning and drying module (3) is equipped with an automatic reflux conveying slide. The reflux slide automatically conveys the clean crucible and mold that have been cleaned and dried to the feeding station of the automatic quantitative module (2), forming a weighing-cleaning internal closed loop.

2. The quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The multi-functional sample entry / exit buffer station (4) has a three-tiered structure: The top layer is a crucible placement platform (47), which has multiple crucible storage positions (48) for vertically placing empty platinum crucibles and empty casting molds; The middle layer is a molten sheet placement stage (46), which is equipped with multiple molten sheet buffer trays for placing the prepared glass molten sheets, and is also equipped with an automatic label printer; The bottom layer is provided with a lower raw material sampling platform (43) and an upper raw material sampling platform (44). The lower raw material sampling platform (43) is located below the upper raw material sampling platform (44), and the lower raw material sampling platform (43) and the upper raw material sampling platform (44) are staggered. Both the upper raw material sampling platform (44) and the lower raw material sampling platform (43) are provided with multiple storage positions (45) for placing powder sample cups. The multifunctional sample loading and unloading buffer platform (4) includes a side support rod (41), and the upper raw material loading platform (44), the melt loading platform (46) and the crucible loading platform (47) are all installed on the side support rod (41). The lower raw material loading platform (43) is provided with triangular connecting frames (42) on both sides of its lower end, and the lower raw material loading platform (43) is fixed to the supporting outer frame (6) through the triangular connecting frames (42).

3. The quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The automatic quantitative module (2) also includes: Automatic sample adding device (24) is used to flip the powder sample in the sample cup and pour it into the crucible; Automatic mixing device (22) is used to mix the sample, flux, internal standard, oxidant and release agent in the crucible at high speed. The bottle heightening support (23) is set on one side of the automatic mixing device (22) to support the mold release agent reagent bottle.

4. The quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The coarse addition mechanism for the inner standard is a large lead screw feeding device, and the fine feeding device for the screw (27) is a small pitch micro screw feeding device; the PLC control system is configured to: when the difference between the real-time weight of the inner standard fed back by the automatic weighing device (25) and the target weight of the inner standard is greater than a preset threshold, start the coarse addition mechanism for the inner standard to feed the material quickly; When the difference is not greater than the preset threshold, the internal standard coarse addition mechanism is stopped and the screw fine feeding device (27) is started to perform low-speed micro-feeding.

5. A quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The automatic release agent dripping device (21) includes two independent precision injection pumps, which are used for volumetric quantitative dripping of oxidant and release agent, respectively; each precision injection pump controls the push rod stroke through a stepper motor, and the PLC control system has pre-stored single dripping volume parameters and dripping number parameters.

6. The quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The ultrasonic cleaning and drying module (3) includes: Install the base plate (38) and fix it inside the supporting outer frame (6); The cleaning and drying unit (37) is located above the mounting base plate (38), and is arranged in the horizontal direction with an ultrasonic heating cleaning tank, a spray rinsing tank and a hot air drying tank. The transport transverse component (31) is located above the cleaning and drying body (37). It uses an electromagnet to attract the cleaning rack and moves back and forth in the left and right direction between each station of the cleaning and drying body (37). A cleaning rack placement assembly (34) is disposed below one end of the transport transverse assembly (31), and the cleaning rack placement assembly (34) is provided with a crucible cleaning rack (33) containing crucibles and a mold cleaning rack (32) containing molds. The crucible cleaning rack (33) and the mold cleaning rack (32) are arranged side by side on the cleaning rack placement assembly (34). A water-gas separator assembly (36) is located at the bottom of the mounting base plate (38) and is used to collect and treat waste liquid and waste gas generated during the cleaning process; The mounting base plate (38) has a first wiring groove (39) on the right side above it, and a second wiring groove (35) on the front end of the mounting base plate (38).

7. A quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The automatic reflux conveying slide is located between the discharge end of the hot air drying tank and the feeding station of the automatic quantitative module (2). The PLC control system reads the amount of clean crucibles on the reflux slide in real time. When the available crucible inventory is lower than the preset value, the quantitative process of the automatic quantitative module (2) is automatically paused until the reflux material is replenished.

8. A quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The PLC control system has pre-stored locked fixed dilution formulas for multiple types of materials. Each formula corresponds to a fixed addition mass of sample, flux, internal standard, oxidant and release agent. The formula parameters remain locked and unchanged during system operation.

9. A quantitative cleaning system for steel raw materials using a fixed dilution ratio according to claim 1, characterized in that: The multi-axis handling module (1) is a six-joint industrial robot, whose end effector integrates a pneumatic gripper and a vacuum suction cup; the pneumatic gripper is used to grip cups, crucibles and molds, and the vacuum suction cup is used to pick up glass flakes.

10. A method for quantitative cleaning of steel raw materials using a fixed dilution ratio, characterized in that, Using the system according to any one of claims 1 to 9 includes the following steps: S1: Place the empty crucible, empty mold and sample cup into the corresponding workstation of the multi-functional sample loading and unloading buffer station (4), and select the material type and enter the sample number through the touch control screen (7). S2: The multi-axis transport module (1) transports the empty crucible to the automatic weighing device (25) of the automatic quantitative module (2), and the system automatically retrieves the corresponding locked fixed dilution formula; S3: Weigh and add the sample and flux into the crucible according to the preset ratio; S4: The internal standard addition process is started. First, the internal standard coarse addition mechanism quickly feeds the material. When the real-time weight is close to the target internal standard weight, it switches to the screw fine feeding device (27) for micro-feeding. It stops after the target value is reached. S5: The precision injection pump of the automatic release agent dripping device (21) drips oxidant and release agent quantitatively according to the preset stroke; S6: The automatic mixing device (22) rotates at high speed to ensure that all materials in the crucible are fully and evenly mixed. S7: The multi-axis conveying module (1) transports the crucible with the prepared ingredients to the transfer station (5), where it is taken away by an external robot and sent to an external high-frequency melting furnace for melting; S8: After melting is completed, the external robot sends the empty crucible and the mold with the melt strip back to the transfer station (5). The multi-axis transport module (1) transfers the melt strip to the melt strip placement platform (46) of the multi-functional sample buffer station (4) and automatically prints a label. The empty crucible and the mold are then sent into the ultrasonic cleaning and drying module (3). S9: The ultrasonic cleaning and drying module (3) sequentially completes ultrasonic heating cleaning, spray rinsing and hot air drying. The cleaned crucible and mold are transported to the feeding station of the automatic quantitative module (2) through the automatic return conveyor slide for use in the next cycle.

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