Automatic feeding and weighing equipment for powdery samples

Abstract

The invention discloses automatic powder sample feeding and weighing equipment which comprises a metal plate frame, an automatic raw material feeding unit and other parts, and high-precision automatic feeding and weighing of a powder sample, a lithium tetraborate fluxing agent and a cobalt internal standard are achieved through the technologies of rotation, spiral feeding and the like. The equipment is controlled by a PLC (programmable logic controller) system, accurately operates according to the feedback of a weighing sensor, can remarkably reduce the workload of personnel and improve the working efficiency, can also be connected into an industrial automatic system, and can be used for feeding and weighing raw materials through rough weighing and fine weighing, and adding cosolvents according to the steps of rough weighing, fine weighing and fine weighing. The cosolvent is rapidly fed by means of the cooperation of an electromagnetic pinch valve and a pinch cylinder. The device has important application value in the field of laboratory analysis, and effectively overcomes the defects of traditional manual weighing.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory analysis automation equipment, in particular to automatic feeding and weighing equipment for powdered samples. Background Art

[0002] In modern laboratory analysis, the accurate weighing of powdered samples (such as iron ore, dolomite, limestone, etc.) and additives such as lithium tetraborate flux and cobalt internal standard is a key link to ensure the accuracy of experimental results. In the past, this process mainly relied on manual operation, and operators needed to use tools such as balances and measuring tools to manually weigh various powdered substances. However, this method has many disadvantages. On the one hand, manual weighing is cumbersome, time-consuming and labor-intensive, and workers need to focus on repetitive weighing actions for a long time, which is labor-intensive and extremely inefficient. On the other hand, manual operation is easily affected by various factors, such as the operator's proficiency, emotional state, temperature, humidity and airflow changes in the weighing environment, etc. These factors will cause large errors in the weighing results, which is difficult to meet the growing demand for high-precision experimental analysis.

[0003] With the continuous deepening of scientific research and the rapid development of industrial production, the requirements for laboratory analysis automation are getting higher and higher. The traditional manual weighing method has become a bottleneck restricting the improvement of experimental efficiency and quality. In this context, the development of an automated, high-precision powder sample weighing device has become an urgent problem to be solved in the industry. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic powder sample feeding and weighing device, which greatly reduces the workload of personnel and improves work efficiency through automated feeding and weighing processes, while ensuring the weighing accuracy of powder samples and additives to meet the needs of laboratory analysis automation.

[0005] A powder sample automatic feeding and weighing device, comprising:

[0006] The sheet metal frame, as the supporting structure of the equipment, is used to carry and install the various components of the equipment, and a working platform is provided in the middle of the sheet metal frame;

[0007] The automatic raw material feeding unit is used to place the sub-bottles containing the raw materials and perform quantitative feeding of the raw materials. The automatic raw material feeding unit is installed on the working platform of the sheet metal frame;

[0008] An automatic weighing module is used to weigh the raw materials and additives. The automatic weighing module is arranged at the lower front side of the raw material automatic feeding unit;

[0009] The co-solvent automatic feeding unit is used for automatically adding additives in a quantitative manner. The co-solvent automatic feeding unit is installed on the upper part of the sheet metal frame and is arranged above the automatic weighing module;

[0010] The automatic sampling door is used to provide a closed feeding and weighing space to prevent external factors from affecting the weighing accuracy. The automatic sampling door is installed on the front face of the sheet metal frame through a guide rail. The automatic sampling door can be moved up and down by a cylinder drive;

[0011] The electric control cabinet is used to control the operation of the equipment. It is installed at the rear of the sheet metal frame and controls the operation algorithm and logic of the entire equipment through the PLC system. The PLC system adopts the Siemens 1200 series.

[0012] As a preferred embodiment of the present invention, the automatic raw material feeding unit includes a rotating mechanism and a tilting mechanism, the tilting mechanism includes a C-shaped groove and a first stepper motor, the first stepper motor is installed on the side of the C-shaped groove and is connected to the C-shaped groove through a transmission assembly to drive the C-shaped groove to flip; the rotating mechanism includes a second stepper motor, the second stepper motor is installed at the bottom of the C-shaped groove, a driven gear and a driving gear are installed in the C-shaped groove, a fixed sleeve is installed on the driven gear, a sub-filling bottle for containing raw materials is placed in the fixed sleeve, and the second stepper motor drives the sub-filling bottle to rotate and feed through the gear transmission of the driven gear and the driving gear.

[0013] As a preferred solution of the present invention, the automatic weighing module includes a weighing sensor and a special shock absorbing module. The weighing sensor is installed on the special shock absorbing module. A crucible placement position is provided on the top of the weighing sensor. The crucible placement position is used to place a platinum crucible. The platinum crucible is used to hold quantitatively proportioned raw materials and additives.

[0014] As a preferred embodiment of the present invention, a protective baffle is provided above the crucible placement position, the protective baffle is installed on the guide rail on the front side of the working platform, and slides left and right through the cylinder, the protective baffle is provided with an open position and a closed position, the open position is used to open when adding raw materials and auxiliary agents, and the closed position is used to cover the platinum crucible during the switching process of the raw material automatic feeding unit and the solvent automatic feeding unit.

[0015] As a preferred solution of the present invention, the automatic solvent feeding unit is installed on a sheet metal frame through a guide rail and a combined cylinder. The combined cylinder adopts two SMC rodless cylinders, and the strokes of the two rodless cylinders are 150 mm and 50 mm respectively; the automatic solvent feeding unit is provided with three workstations, which include: an empty bin in the middle, a lithium tetraborate flux feeding unit on the left, and a cobalt internal standard feeding unit on the right; the combined cylinder is used for switching the workstations, and the cobalt internal standard feeding unit and the lithium tetraborate flux feeding unit both include a silo in the upper part, a quick feeding mechanism and a precision feeding mechanism in the lower part.

[0016] As a preferred solution of the present invention, the rapid feeding mechanism comprises a special hose connected to the silo, an electromagnetic clamping valve and a clamping cylinder clamped on the hose, and the electromagnetic clamping valve is arranged above the clamping cylinder.

[0017] As a preferred embodiment of the present invention, the precision feeding mechanism includes, from top to bottom, a third stepper motor, a coupling, a bearing fixing seat, and a precision spiral feeding shaft. A conical silo is installed on the outer side of the precision spiral feeding shaft. The conical silo is connected to the top silo through a silicone hose. A feeding pipe is installed at the lower end of the conical silo, and a conical discharge port is installed below the feeding pipe. The third stepper motor drives the precision spiral feeding shaft to precisely feed lithium tetraborate and cobalt powder.

[0018] As a preferred solution of the present invention, a rotating stirring motor is installed on the top of the cobalt internal standard silo to prevent the cobalt internal standard from piling up inside the silo.

[0019] The present invention also provides a feeding and weighing method of the automatic feeding and weighing device for powdered samples, comprising the following steps:

[0020] Step 1: First, weigh 10g of raw material in the sub-filling bottle, put it into the automatic weighing unit, put the platinum crucible into the weighing position of the automatic weighing unit, and press the start button;

[0021] Step 2: The automatic sampling door is closed, the raw material feeding unit starts to rotate and tilt, and the sample falls into the platinum crucible. According to the feedback data of the weighing sensor, it is carried out in two stages: rough weighing and fine weighing. Rough weighing: when the sub-filling bottle rotates quickly, the material will fall quickly and the precision is low; fine weighing: when the sub-filling bottle rotates very slowly, the material will fall slowly and the precision is high; after adding the sample to the set value, stop rotating;

[0022] Step 3: Control the protective baffle to close, then the raw material sub-filling bottle returns to the initial state, and the co-solvent automatic feeding unit switches to the lithium tetraborate silo;

[0023] Step 4: According to the weighing data of the sample, the PLC system automatically calculates the target value of the lithium tetraborate flux, the protective baffle opens, and then the lithium tetraborate flux is added according to the steps of rough weighing, fine weighing, and fine weighing set by the program. After the addition is completed, the protective baffle closes;

[0024] Roughly speaking: fast feeding mechanism feeding + the third stepper motor drives the fast rotation of the precision spiral feeding shaft;

[0025] Precision weighing: Slow rotation of the precision spiral feed shaft driven by the third stepper motor;

[0026] Details: Intermittent rotation of the precision screw feed shaft (the angle of each rotation can be set, usually 20, 40 or 60 degrees

[0027] Step 5: The automatic feeding unit of the solvent is switched to the cobalt internal standard material bin. According to the weighing data of the sample, the PLC system automatically calculates the target value of the cobalt internal standard, the protective baffle is opened, and then the cobalt internal standard is added in the order of rough weighing, fine weighing, and fine weighing set by the program. After the feeding is completed, the protective baffle is closed; this is the same as the lithium tetraborate flux;

[0028] Step 6: The material bin is switched to an empty bin, the protective baffle is opened, the automatic sampling door is opened, and the sub-filling bottles and platinum crucibles are taken out manually or by a robot.

[0029] The present invention also provides a method for quickly adding a solvent to a powder sample automatic adding and weighing device, comprising the following steps:

[0030] A. The solenoid pinch valve is opened, allowing the set weight of lithium tetraborate or cobalt internal standard to fall into the dedicated hose cavity between the solenoid pinch valve and the pinch cylinder;

[0031] B. The electromagnetic pinch valve is closed, and the pinch cylinder is opened, causing the material to fall through the lower outlet into the platinum crucible;

[0032] C. After waiting for 6 seconds, the clamp cylinder will automatically close, completing the rapid feeding action.

[0033] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0034] 1. The equipment realizes the automatic feeding and weighing of powdered samples and additives, greatly reducing the manual operation links, significantly improving work efficiency and reducing the workload of personnel.

[0035] 2. Through the automatic weighing module and precise feeding control method (such as coarse and fine weighing of raw materials, coarse, fine and fine weighing of co-solvents), the influence of human factors on weighing accuracy is effectively avoided, ensuring high-precision weighing of powdered samples and additives.

[0036] 3. The various components are compactly arranged and work in coordination. For example, the automatic sampling door provides a confined space, the protective baffle prevents material spillage and external interference, the multi-station design of the automatic solvent feeding unit and the coordination of different feeding mechanisms make the equipment run stably and reliably.

[0037] 4. It can be connected to the industrial automation system as an automatic weighing unit to meet the laboratory analysis needs in different industrial scenarios and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a front structural schematic diagram of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of the present invention with the left side of the housing removed;

[0040] Figure 3 This is a schematic diagram of the internal structure of the present invention with the front side of the housing removed;

[0041] Figure 4 It is a schematic diagram of the initial state and feeding state of the raw material automatic feeding unit of the present invention;

[0042] Figure 5 It is a schematic diagram of the three working positions of the combined cylinder structure of the present invention corresponding to the automatic feeding unit of the solvent;

[0043] Figure 6 It is a schematic diagram of the positions of the quick feeding mechanism and the precise feeding mechanism of the present invention;

[0044] Figure 7 It is a schematic diagram of the rapid feeding mechanism of the present invention;

[0045] Figure 8 It is a schematic diagram of the precision feeding mechanism of the present invention;

[0046] Fig. 9 It is a top view of the positions of the sub-packaging bottle and the platinum crucible of the present invention;

[0047] Fig.10 It is a schematic diagram of the assembly of the fixed sleeve and the sub-filling bottle of the present invention;

[0048] Fig.11 It is a schematic diagram of the automatic weighing module of the present invention;

[0049] Fig.12 It is a schematic diagram of the crucible placement position and platinum crucible assembly of the present invention;

[0050] Fig.13 This is a diagram showing the protective baffle of the present invention in an open state;

[0051] Fig.14 This is a diagram of the protective baffle of the present invention in a closed state.

[0052] In the figure: 1. sheet metal frame; 2. automatic feeding unit for raw materials; 3. automatic weighing module; 4. automatic feeding unit for co-solvent; 5. automatic sampling door; 6. electric control cabinet; 7. U-shaped slot; 8. first stepper motor; 9. second stepper motor; 10. driven gear; 11. driving gear; 12. fixed sleeve; 13. sub-filling bottle; 14. weighing sensor; 15. special shock-absorbing module; 16. crucible placement; 17. platinum crucible; 18. protective baffle; 19. combined cylinder; 20. silo; 21. fast feeding mechanism; 22. precision feeding mechanism; 23. special hose; 24. electromagnetic clamp valve; 25. clamp cylinder; 26. third stepper motor; 27. coupling; 28. bearing fixing seat; 29. ​​precision spiral feeding shaft; 30. conical silo; 31. feeding pipe; 32. conical discharge port; 33. rotary stirring motor. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0054] Example 1

[0055] like Figures 1 to 14 As shown, a specific embodiment of the automatic feeding and weighing device for powdered samples according to the present invention comprises:

[0056] Sheet metal frame 1: Figure 1 , as the supporting structure of the equipment, it carries and installs the various components of the equipment. A working platform is set in the middle of the interior to provide an installation foundation for other components;

[0057] Raw material automatic feeding unit 2: Figure 1 , 4 , installed on the working platform of the sheet metal frame 1, used to place the sub-filling bottle 13 containing the raw materials and realize the quantitative feeding of the raw materials; the unit includes a rotating mechanism and a tilting mechanism, the tilting mechanism is composed of a U-shaped groove 7 and a first stepping motor 8, the first stepping motor 8 is installed on the side of the U-shaped groove 7 through a transmission component, and drives the U-shaped groove 7 to flip; the second stepping motor 9 of the rotating mechanism is installed at the bottom of the U-shaped groove 7, and drives the sub-filling bottle 13 to rotate and feed through the transmission of the driven gear 10 and the driving gear 11, and the sub-filling bottle 13 is installed in the fixed sleeve 12 on the driven gear 10;

[0058] Automatic weighing module 3: Figure 1 , 9, 11, 12, located at the lower front side of the raw material automatic feeding unit 2, including a weighing sensor 14 and a special shock absorbing module 15; the weighing sensor 14 is installed on the special shock absorbing module 15, and a crucible placement position 16 is provided on the top of the special shock absorbing module 15 for placing a platinum crucible 17 to accurately weigh the raw materials and additives; the weighing sensor 14 and the special shock absorbing module 15 respectively adopt Toledo H8C3 weighing sensor and Canare GNV rubber shock absorber;

[0059] Co-solvent automatic feeding unit 4: Figure 1 , 3 , installed on the upper part of the sheet metal frame 1, located above the automatic weighing module 3; installed on the sheet metal frame 1 through the guide rail and the combined cylinder 19, such as Figure 3 , 5 The combined cylinder 19 uses two SMC rodless cylinders with strokes of 150 mm and 50 mm respectively; the unit is provided with three stations, namely, the empty bin in the middle, the lithium tetraborate flux feeding unit on the left, and the cobalt internal standard feeding unit on the right; each feeding unit comprises a bin 20 at the upper part, a fast feeding mechanism 21 at the lower part, and a precision feeding mechanism 22;

[0060] Rapid feeding mechanism 21: Figure 6 , 7 , which is a part of the automatic solvent feeding unit 4, and includes a special hose 23 connected to the silo 20, an electromagnetic clamping valve 24 and a clamping cylinder 25 clamped on the hose, wherein the electromagnetic clamping valve 24 is located above the clamping cylinder 25, and is used to realize rapid quantitative addition of the solvent;

[0061] Precision feeding mechanism 22: Figure 6 , 8 , which also belongs to the automatic feeding unit 4 of the co-solvent, comprises, from top to bottom, a third stepping motor 26, a coupling 27, a bearing fixing seat 28, and a precision spiral feeding shaft 29; a conical silo 30 is installed on the outer side of the precision spiral feeding shaft 29, which is connected to the top silo 20 through a silicone hose (not shown in the figure), and the lower end is connected to a feeding pipe 31 and a conical discharge port 32; the third stepping motor 26 drives the precision spiral feeding shaft 29 to realize the precision feeding of lithium tetraborate and cobalt powder;

[0062] Automatic injection door 5: Figure 1 , 2 3. It is installed on the front end of the sheet metal frame 1 through a guide rail and can be moved up and down by a cylinder, providing a closed feeding and weighing space, effectively avoiding the influence of external factors on the weighing accuracy;

[0063] Electric control cabinet 6: Figure 1 , 2, installed at the rear of the sheet metal frame 1, and the Siemens 1200 series PLC system is used inside to control the operation algorithm and logic of the overall equipment, so as to realize the coordinated work of various components of the equipment; the electric control cabinet part adopts the products of the existing technology, which are well known to those skilled in the art and have not been improved, and its structure will not be described here;

[0064] Protective baffle 18: Fig. 9 , 13 , 14, arranged above the crucible placement position 16, installed on the guide rail on the front side of the working platform, and sliding left and right through the cylinder; having an open position and a closed position, the open position is used to open when adding raw materials and additives, and the closed position is used to cover the platinum crucible 17 during the switching process of the raw material automatic feeding unit 2 and the auxiliary solvent automatic feeding unit 4 to prevent material spillage and external interference;

[0065] A rotary stirring motor 33 is also installed on the top of the cobalt internal standard material bin 20. Figure 3 , preventing the cobalt internal standard from piling up inside the silo 20, ensuring that the cobalt internal standard can be added smoothly.

[0066] Adding weighing method

[0067] Raw material weighing and adding: First, weigh 10g of raw material in the sub-bottle 13, put it into the automatic weighing unit, and place the platinum crucible 17 at the weighing position of the automatic weighing unit, and press the start button; after the automatic sampling door 5 is closed, the raw material feeding unit starts to rotate and tilt, and the sample falls into the platinum crucible 17; according to the feedback data of the weighing sensor 14, it is divided into two stages: rough weighing and fine weighing: during rough weighing, the sub-bottle 13 rotates quickly, the material falls fast but the accuracy is low; during fine weighing, the sub-bottle 13 rotates slowly, the material falls slowly but the accuracy is high, and the rotation stops after reaching the set value;

[0068] Adding solvent: controlling the protective baffle 18 to extend, the raw material sub-filling bottle 13 returns to the initial state, and the automatic solvent feeding unit 4 switches to the lithium tetraborate silo 20; the PLC system automatically calculates the target value of the lithium tetraborate flux according to the sample weighing data, opens the protective baffle 18, and adds the lithium tetraborate flux according to the steps of rough weighing (rapid feeding + the third stepping motor 26 drives the precision screw feeding shaft 29 to rotate rapidly), fine weighing (the third stepping motor 26 drives the precision screw feeding shaft 29 to rotate slowly), and fine weighing (the precision screw feeding shaft 29 rotates intermittently, and the rotation angle can be set each time, usually 20, 40 or 60 degrees). After the feeding is completed, the protective baffle 18 extends; then, the automatic solvent feeding unit 4 switches to the cobalt internal standard silo 20, repeats the above-mentioned operations of calculating the target value, opening the protective baffle 18, feeding according to the steps, and extending the protective baffle 18, to complete the addition of the cobalt internal standard;

[0069] Complete the operation: the automatic solvent feeding unit 4 is switched to the middle empty position, the protective baffle 18 is retracted, the automatic sampling door 5 is opened, and the sub-filling bottle 13 and the platinum crucible 17 can be taken out manually or by a robot.

[0070] Method for rapid addition of co-solvent: the electromagnetic pinch valve 24 is opened, and the set weight of lithium tetraborate or cobalt internal standard falls into the tube cavity of the special hose 23 between the electromagnetic pinch valve 24 and the pinch cylinder 25; the electromagnetic pinch valve 24 is closed, the pinch cylinder 25 is opened, and the material falls through the lower end outlet and falls into the platinum crucible 17; after waiting for 6 seconds, the pinch cylinder 25 is automatically closed, and the rapid addition action is completed.

[0071] Speed ​​range: 100-200 rpm for coarse weighing; 20-50 rpm for fine weighing, which can be fine-tuned according to the fluidity of the material.

[0072] The weighing sensor, special shock absorbing module, electric control cabinet, electromagnetic pinch valve, cylinder, combined cylinder, stepper motor, automatic injection door and other components in this article are all universal standard parts or components known to those skilled in the art, and no improvements have been made to these devices. Their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods, so no further records will be made here.

[0073] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and modifications or deformations without creative labor are still within the protection scope of the present invention.

Claims

1. An automatic feeding and weighing device for powdered samples, characterized in that: include: The sheet metal frame, as the supporting structure of the equipment, is used to carry and install the various components of the equipment, and a working platform is provided in the middle of the sheet metal frame; The automatic raw material feeding unit is used to place the sub-bottles containing the raw materials and perform quantitative feeding of the raw materials. The automatic raw material feeding unit is installed on the working platform of the sheet metal frame; An automatic weighing module is used to weigh the raw materials and additives. The automatic weighing module is arranged at the lower front side of the raw material automatic feeding unit; The co-solvent automatic feeding unit is used for automatically adding additives in a quantitative manner. The co-solvent automatic feeding unit is installed on the upper part of the sheet metal frame and is arranged above the automatic weighing module; The automatic sampling door is used to provide a closed feeding and weighing space to prevent external factors from affecting the weighing accuracy. The automatic sampling door is installed on the front face of the sheet metal frame through a guide rail. The automatic sampling door can be moved up and down by a cylinder drive; The electric control cabinet is used to control the operation of the equipment. It is installed at the rear of the sheet metal frame and controls the operation algorithm and logic of the entire equipment through the PLC system.

2. The automatic powder sample feeding and weighing device according to claim 1, characterized in that: The automatic raw material feeding unit includes a rotating mechanism and a tilting mechanism. The tilting mechanism includes a C-shaped groove and a first stepper motor. The first stepper motor is installed on the side of the C-shaped groove and is connected to the C-shaped groove through a transmission component to drive the C-shaped groove to flip. The rotating mechanism includes a second stepper motor, which is installed at the bottom of the C-shaped groove. A driven gear and a driving gear are installed in the C-shaped groove. A fixed sleeve is installed on the driven gear. A sub-filling bottle for containing raw materials is placed in the fixed sleeve. The second stepper motor drives the sub-filling bottle to rotate and feed through the gear transmission of the driven gear and the driving gear.

3. The automatic powder sample feeding and weighing device according to claim 1, characterized in that: The automatic weighing module includes a weighing sensor and a special shock absorbing module. The weighing sensor is installed on the special shock absorbing module. A crucible placement position is arranged on the top of the weighing sensor. The crucible placement position is used to place a platinum crucible. The platinum crucible is used to hold raw materials and additives in a quantitative ratio.

4. The automatic powder sample feeding and weighing device according to claim 3 is characterized in that: A protective baffle is arranged above the crucible placement position, which is installed on the guide rail on the front side of the working platform and slides left and right through the cylinder. The protective baffle is provided with an open position and a closed position. The open position is used to open when adding raw materials and auxiliary agents, and the closed position is used to cover the platinum crucible during the switching process between the raw material automatic feeding unit and the auxiliary solvent automatic feeding unit.

5. The automatic powder sample feeding and weighing device according to claim 1, characterized in that: The automatic solvent feeding unit is installed on the sheet metal frame through a guide rail and a combined cylinder. The combined cylinder adopts two SMC rodless cylinders, and the strokes of the two rodless cylinders are 150 mm and 50 mm respectively. The automatic solvent feeding unit is provided with three workstations, which include: an empty warehouse position in the middle, a lithium tetraborate flux feeding unit on the left, and a cobalt internal standard feeding unit on the right. The combined cylinder is used for switching the workstations. Both the cobalt internal standard feeding unit and the lithium tetraborate flux feeding unit include a material bin in the upper part, a quick feeding mechanism and a precision feeding mechanism in the lower part.

6. The automatic powder sample feeding and weighing device according to claim 5, characterized in that: The rapid feeding mechanism comprises a special hose connected to the material bin, an electromagnetic clamping valve and a clamping cylinder clamped on the hose, wherein the electromagnetic clamping valve is arranged above the clamping cylinder.

7. The automatic powder sample feeding and weighing device according to claim 5, characterized in that: The precision feeding mechanism includes, from top to bottom, a third stepper motor, a coupling, a bearing fixing seat, and a precision spiral feeding shaft. A conical silo is installed on the outer side of the precision spiral feeding shaft. The conical silo is connected to the top silo through a silicone hose. A feeding pipe is installed at the lower end of the conical silo, and a conical discharge port is installed below the feeding pipe. The third stepper motor drives the precision spiral feeding shaft to precisely feed lithium tetraborate and cobalt powder.

8. The automatic powder sample feeding and weighing device according to claim 5, characterized in that: A rotating stirring motor is installed on the top of the cobalt internal standard silo to prevent the cobalt internal standard from piling up inside the silo.

9. A method for weighing powdered samples using an automatic weighing device, characterized in that: The following steps are involved: Step 1: First, weigh 10g of raw material in the sub-filling bottle, put it into the automatic weighing unit, put the platinum crucible into the weighing position of the automatic weighing unit, and press the start button; Step 2: The automatic sampling door is closed, the raw material feeding unit starts to rotate and tilt, and the sample falls into the platinum crucible. According to the feedback data of the weighing sensor, it is carried out in two stages: rough weighing and fine weighing. After adding the set amount of sample, the rotation stops. Rough weighing: the filling bottle rotates quickly, the material falls quickly, and the accuracy is low; Precision weighing: The rotating speed of the filling bottle is slow, the material falls slowly, and the precision is high; Step 3: Control the protective baffle to close, then the raw material sub-filling bottle returns to the initial state, and the co-solvent automatic feeding unit switches to the lithium tetraborate silo; Step 4: According to the weighing data of the sample, the PLC system automatically calculates the target value of the lithium tetraborate flux, the protective baffle opens, and then the lithium tetraborate flux is added according to the steps of rough weighing, fine weighing, and fine weighing set by the program. After the addition is completed, the protective baffle closes; Roughly speaking: fast feeding mechanism feeding + the third stepper motor drives the fast rotation of the precision spiral feeding shaft; Precision weighing: Slow rotation of the precision spiral feed shaft driven by the third stepper motor; Fine Scale: Intermittent rotation of the precision screw feed shaft, with the angle of each rotation set to 20, 40 or 60 degrees; Step 5: The automatic feeding unit of the solvent is switched to the cobalt internal standard material bin. According to the weighing data of the sample, the PLC system automatically calculates the target value of the cobalt internal standard, the protective baffle is opened, and then the cobalt internal standard is added in the order of rough weighing, fine weighing, and fine weighing set by the program. After the feeding is completed, the protective baffle is closed; this is the same as the lithium tetraborate flux; Step 6: The material bin is switched to an empty bin, the protective baffle is opened, the automatic sampling door is opened, and the sub-filling bottles and platinum crucibles are taken out manually or by a robot.

10. A method for quickly adding a solvent to an automatic feeding and weighing device for powdered samples, characterized in that: The following steps are involved: A. The solenoid pinch valve is opened, allowing the set weight of lithium tetraborate or cobalt internal standard to fall into the dedicated hose cavity between the solenoid pinch valve and the pinch cylinder; B. The electromagnetic pinch valve is closed, and the pinch cylinder is opened, causing the material to fall through the lower outlet into the platinum crucible; C. After waiting for 6 seconds, the clamp cylinder will automatically close, completing the rapid feeding action.

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