Automatic feeding and weighing equipment for powdery samples

Abstract

The utility model discloses an automatic feeding and weighing device for powdery samples, which comprises a metal plate frame, an automatic raw material feeding unit and the like, and realizes high-precision automatic feeding and weighing of the powdery samples, lithium tetraborate fluxing agents and cobalt internal labels by using 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] This utility model relates to the field of laboratory analysis automation equipment technology, specifically an automatic feeding and weighing device for powdered samples. Background Technology

[0002] In modern laboratory analysis, the accurate weighing of powdered samples (such as iron ore, dolomite, and limestone) and additives such as lithium tetraborate flux and cobalt internal standard is crucial for ensuring the accuracy of experimental results. Previously, this process relied primarily on manual operation, requiring operators to manually weigh various powdered substances using balances, measuring instruments, and other tools. However, this method has several drawbacks. Firstly, manual weighing is tedious, time-consuming, and labor-intensive, requiring staff to focus on repetitive weighing actions for extended periods, resulting in high labor intensity and extremely low efficiency. Secondly, manual operation is highly susceptible to interference from various factors, such as the operator's skill level, emotional state, and changes in the temperature, humidity, and airflow of the weighing environment. These factors can all lead to significant errors in the weighing results, making it difficult to meet the ever-increasing demands for high-precision experimental analysis.

[0003] With the continuous deepening of scientific research and the rapid development of industrial production, the requirements for automation in laboratory analysis are getting higher and higher. Traditional manual weighing methods have become a bottleneck restricting the improvement of experimental efficiency and quality. Against this background, the development of an automated and high-precision powder sample feeding and weighing device has become an urgent problem to be solved in the industry. Utility Model Content

[0004] The purpose of this invention is to provide an automatic feeding and weighing device for powdered samples. Through the automated feeding and weighing process, it greatly reduces the workload of personnel, improves work efficiency, and ensures the weighing accuracy of powdered samples and additives, thus meeting the needs of automated laboratory analysis.

[0005] An automatic feeding and weighing device for powdered samples includes:

[0006] The sheet metal frame serves as a support structure for the equipment, supporting and installing its various components. A working platform is located in the middle of the sheet metal frame.

[0007] The automatic raw material feeding unit is used to place the dispensing bottles containing raw materials and to quantitatively feed the raw materials. The automatic raw material feeding unit is installed on the working platform of the sheet metal frame.

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

[0009] The automatic dispensing unit for cosolvents is used to automatically and quantitatively add additives. The automatic dispensing unit for cosolvents is installed on the upper part of the sheet metal frame and positioned above the automatic weighing module.

[0010] Automatic sample inlet gate is used to provide a sealed feeding and weighing space to avoid external factors affecting weighing accuracy. The automatic sample inlet gate is installed on the front face of the sheet metal frame via guide rails and can move up and down by a cylinder.

[0011] The electrical control cabinet is used to control the operation of the equipment. It is installed at the rear of the sheet metal frame and uses a PLC system to control the overall operation algorithm and logic of the equipment. The PLC system adopts the Siemens 1200 series.

[0012] As a preferred embodiment of this utility model, the automatic raw material feeding unit includes a rotating mechanism and a tilting mechanism. The tilting mechanism includes a U-shaped trough and a first stepper motor. The first stepper motor is installed on the side of the U-shaped trough and connected to the U-shaped trough through a transmission component to drive the U-shaped trough to perform a flipping action. The rotating mechanism includes a second stepper motor, which is installed at the bottom of the U-shaped trough. A driven gear and a driving gear are installed inside the U-shaped trough. A fixed sleeve is installed on the driven gear, and a dispensing bottle for holding raw materials is placed inside the fixed sleeve. The second stepper motor drives the dispensing bottle to rotate and feed the raw materials through the gear transmission of the driven gear and the driving gear.

[0013] As a preferred embodiment of this utility model, the automatic weighing module includes a weighing sensor and a dedicated shock absorption module. The weighing sensor is installed on the dedicated shock absorption module, and a crucible placement position is provided on the top of the weighing sensor. The crucible placement position is used to place a platinum crucible, which is used to hold a quantitatively proportioned raw material and additives.

[0014] As a preferred embodiment of this utility model, 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 by a 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 additives, and the closed position is used to cover the platinum crucible during the switching process between the automatic raw material feeding unit and the automatic solvent feeding unit.

[0015] As a preferred embodiment of this utility model, the automatic flux feeding unit is mounted on a sheet metal frame via a guide rail and a combined cylinder. The combined cylinder uses two SMC rodless cylinders with strokes of 150mm and 50mm respectively. The automatic flux feeding unit has three stations: a middle empty hopper, a lithium tetraborate flux feeding unit on the left, and a cobalt internal standard feeding unit on the right. The combined cylinder is used to switch between stations. Both the cobalt internal standard feeding unit and the lithium tetraborate flux feeding unit include an upper hopper, a lower rapid feeding mechanism, and a precision feeding mechanism.

[0016] As a preferred embodiment of this utility model, the rapid feeding mechanism includes a special hose connected to the hopper, an electromagnetic clamping valve clamped on the hose, and a clamping cylinder, wherein the electromagnetic clamping valve is located above the clamping cylinder.

[0017] As a preferred embodiment of this utility model, 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 hopper is installed on the outer side of the precision spiral feeding shaft. The conical hopper is connected to the top hopper through a silicone hose. A feeding pipe is installed at the lower end of the conical hopper, 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 embodiment of this utility model, a rotary 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] This utility model also provides a feeding and weighing method for an automatic feeding and weighing device for powdered samples, including the following steps:

[0020] Step 1: First, weigh 10g of raw material into the dispensing bottle and place it into the automatic weighing unit. Place the platinum crucible into the weighing position of the automatic weighing unit and press the start button.

[0021] Step 2: The automatic sample inlet door closes, and the raw material feeding unit begins to rotate and tilt. The sample falls into the platinum crucible. Based on the feedback data from the weighing sensor, the process is divided into two stages: coarse weighing and fine weighing. Coarse weighing: When the dispensing bottle rotates rapidly, the material falls quickly, resulting in low accuracy. Fine weighing: When the dispensing bottle rotates very slowly, the material falls slowly, resulting in high accuracy. After the sample reaches the set amount, the rotation stops.

[0022] Step 3: Control the protective baffle to close, then the raw material dispensing bottle returns to its initial state, and the cosolvent automatic feeding unit switches to the lithium tetraborate hopper;

[0023] Step 4: Based on the sample weighing data, the PLC system automatically calculates the target value of lithium tetraborate flux, opens the protective baffle, and then adds lithium tetraborate flux according to the programmed steps of coarse weighing, fine weighing, and detailed weighing. After the addition is completed, the protective baffle is closed.

[0024] Roughly speaking: The rapid feeding mechanism feeds the material, and the third stepper motor drives the rapid rotation of the precision screw feed shaft;

[0025] Precision measurement: The 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 is adjustable, typically 20, 40, or 60 degrees).

[0027] Step 5: The automatic fluxing unit switches to the cobalt internal standard hopper. Based on the sample weighing data, the PLC system automatically calculates the target value of the cobalt internal standard, the protective baffle opens, and then the cobalt internal standard is added in the order of coarse weighing, fine weighing, and fine weighing set in the program. After the addition is completed, the protective baffle closes. This is the same as for lithium tetraborate flux.

[0028] Step Six: Switch the material hopper to an empty hopper, open the protective baffle, open the automatic sample inlet door, and remove the dispensing bottles and platinum crucible manually or by robotic arm.

[0029] This utility model also provides a method for rapid addition of cosolvents in an automatic feeding and weighing device for powdered samples, including the following steps:

[0030] A. The electromagnetic clamp valve opens, allowing the set weight of lithium tetraborate or cobalt inner standard to fall into the dedicated hose cavity between the electromagnetic clamp valve and the clamp cylinder.

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

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

[0033] By adopting the above technical solution, this utility model has the following beneficial effects:

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

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

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

[0037] 4. It can be connected to industrial automation systems as an automatic weighing unit, meeting the laboratory analysis needs of different industrial scenarios and has good application prospects. Attached Figure Description

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

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

[0040] Figure 3 This is a schematic diagram of the internal structure of the present invention with the outer shell removed from the front.

[0041] Figure 4 This is a schematic diagram showing the initial state and feeding state of the automatic raw material feeding unit of this utility model;

[0042] Figure 5 This is a schematic diagram showing the three workstation positions of the combined cylinder structure of this utility model corresponding to the automatic solvent feeding unit;

[0043] Figure 6 This is a schematic diagram showing the positions of the rapid feeding mechanism and the precision feeding mechanism of this utility model;

[0044] Figure 7 This is a schematic diagram of the rapid feeding mechanism of this utility model;

[0045] Figure 8 This is a schematic diagram of the precision feeding mechanism of this utility model;

[0046] Figure 9 This is a top view showing the positions of the dispensing bottle and the platinum crucible of this utility model;

[0047] Figure 10 This is a schematic diagram of the assembly of the fixing sleeve and the dispensing bottle of this utility model;

[0048] Figure 11 This is a schematic diagram of the automatic weighing module of this utility model;

[0049] Figure 12 This is a schematic diagram of the crucible placement position and platinum crucible assembly of this utility model;

[0050] Figure 13 This is a diagram showing the protective baffle of this utility model in its open state;

[0051] Figure 14 This is a diagram showing the protective baffle of this utility model in its closed state.

[0052] In the diagram: 1. Sheet metal frame; 2. Automatic raw material feeding unit; 3. Automatic weighing module; 4. Automatic solvent feeding unit; 5. Automatic sample inlet gate; 6. Electrical control cabinet; 7. U-shaped trough; 8. First stepper motor; 9. Second stepper motor; 10. Driven gear; 11. Drive gear; 12. Fixing sleeve; 13. Dispensing bottle; 14. Weighing sensor; 15. Dedicated shock absorption module; 16. Crucible placement position; 17. Platinum crucible; 18. Protective baffle; 19. Combined cylinder; 20. Hopper; 21. Rapid feeding mechanism; 22. Precision feeding mechanism; 23. Dedicated hose; 24. Electromagnetic clamp valve; 25. Clamp cylinder; 26. Third stepper motor; 27. Coupling; 28. Bearing mounting seat; 29. ​​Precision spiral feeding shaft; 30. Conical hopper; 31. Feeding pipe; 32. Conical discharge port; 33. Rotary stirring motor. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all 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 this utility model includes:

[0056] Sheet metal frame 1: such as Figure 1 As a supporting structure for the equipment, it supports and installs the various components of the equipment. Its internal central part has a working platform to provide an installation foundation for other components.

[0057] Automatic raw material feeding unit 2: such as Figure 1 , 4 The unit is installed on the working platform of the sheet metal frame 1 and is used to place the dispensing bottles 13 containing raw materials and to realize the quantitative feeding of raw materials. The unit includes a rotating mechanism and a tilting mechanism. The tilting mechanism consists of a U-shaped groove 7 and a first stepper motor 8. The first stepper motor 8 is installed on the side of the U-shaped groove 7 through a transmission assembly and drives the U-shaped groove 7 to rotate. The second stepper motor 9 of the rotating mechanism is installed at the bottom of the U-shaped groove 7 and drives the dispensing bottle 13 to rotate and feed materials through the transmission of the driven gear 10 and the driving gear 11. The dispensing bottle 13 is installed in the fixed sleeve 12 on the driven gear 10.

[0058] Automatic weighing module 3: such as Figure 1 , 911 and 12 are located below the front side of the automatic raw material feeding unit 2, and include a weighing sensor 14 and a dedicated shock absorption module 15. The weighing sensor 14 is mounted on the dedicated shock absorption module 15, and its top is provided with a crucible placement position 16 for placing a platinum crucible 17 to accurately weigh the raw materials and additives. The weighing sensor 14 and the dedicated shock absorption module 15 respectively adopt Toledo H8C3 weighing sensor and GNV rubber shock absorber.

[0059] Automatic solvent feeding unit 4: such as Figure 1 , 3 It is installed on the upper part of the sheet metal frame 1, above the automatic weighing module 3; it is mounted on the sheet metal frame 1 via guide rails and a combination cylinder 19, as shown below. Figure 3 , 5 The combined cylinder 19 uses two rodless cylinders from SMC, with strokes of 150mm and 50mm respectively. The unit has three stations: the middle empty chamber, the lithium tetraborate flux feeding unit on the left, and the cobalt internal standard feeding unit on the right. Each feeding unit includes an upper hopper 20, a lower rapid feeding mechanism 21, and a precision feeding mechanism 22.

[0060] Rapid feeding mechanism 21: such as Figure 6 , 7 It is part of the automatic dispensing unit 4 for cosolvents, including a special hose 23 connected to the hopper 20, an electromagnetic clamping valve 24 clamped on the hose and a clamping cylinder 25. The electromagnetic clamping valve 24 is located above the clamping cylinder 25 and is used to achieve rapid quantitative addition of cosolvents.

[0061] Precision feeding mechanism 22: such as Figure 6 , 8 Also belonging to the automatic feeding unit 4 for cosolvents, from top to bottom it includes a third stepper motor 26, a coupling 27, a bearing mounting seat 28, and a precision spiral feeding shaft 29; a conical hopper 30 is installed on the outside of the precision spiral feeding shaft 29, which is connected to the top hopper 20 through a silicone hose (not shown in the figure), and the lower end is connected to the feeding pipe 31 and the conical discharge port 32; the third stepper motor 26 drives the precision spiral feeding shaft 29 to achieve precise feeding of lithium tetraborate and cobalt powder;

[0062] Automatic sample inlet gate 5: such as Figure 1 , 2 3. It is installed on the front face of the sheet metal frame 1 via guide rails and can move up and down by cylinder drive, providing a sealed feeding and weighing space, effectively avoiding the influence of external factors on the weighing accuracy;

[0063] Electrical control cabinet 6: such as Figure 1 , 2Installed at the rear of sheet metal frame 1, the internal system uses Siemens 1200 series PLC system to control the overall operation algorithm and logic of the equipment, so as to realize the coordinated work of various components of the equipment; the electrical control cabinet uses existing technology products, which are well known to those skilled in the art, and has not been improved, so its structure will not be described in detail here.

[0064] Protective baffle 18: such as Figure 9 , 13 14, is set above the crucible placement position 16 and installed on the guide rail on the front side of the working platform. It slides left and right by a cylinder. It has an open position and a closed position. The open position is used to open when adding raw materials and additives. The closed position is used to cover the platinum crucible 17 during the switching process between the automatic raw material feeding unit 2 and the automatic solvent 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 silo 20, such as... Figure 3 This prevents cobalt internal standard from piling up inside the silo 20 and ensures that the cobalt internal standard can be fed smoothly.

[0066] Feeding and weighing method

[0067] Raw material weighing and addition: First, weigh 10g of raw material into dispensing bottle 13 and place it into the automatic weighing unit. Place the platinum crucible 17 in the weighing position of the automatic weighing unit and press the start button. After the automatic sample gate 5 closes, 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, the process is divided into two stages: coarse weighing and fine weighing. During coarse weighing, dispensing bottle 13 rotates quickly, and the material falls quickly but with low accuracy. During fine weighing, dispensing bottle 13 rotates slowly, and the material falls slowly but with high accuracy. The rotation stops after the set value is reached.

[0068] Adding flux: The protective baffle 18 extends, the raw material dispensing bottle 13 returns to its initial state, and the automatic flux feeding unit 4 switches to the lithium tetraborate hopper 20. The PLC system automatically calculates the target value of the lithium tetraborate flux based on the sample weighing data, opens the protective baffle 18, and adds the lithium tetraborate flux according to the following steps: coarse weighing (rapid feeding + the third stepper motor 26 drives the precision screw feeding shaft 29 to rotate rapidly), fine weighing (the third stepper motor 26 drives the precision screw feeding shaft 29 to rotate slowly), and final 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 flux feeding unit 4 switches to the cobalt internal standard hopper 20 and repeats the above 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] Operation complete: The automatic solvent feeding unit 4 switches to the middle empty compartment, the protective baffle 18 retracts, the automatic sample inlet door 5 opens, and the dispensing bottle 13 and platinum crucible 17 can be removed manually or by a robotic arm.

[0070] Rapid feeding method for cosolvent: The electromagnetic clamp valve 24 is opened, allowing the set weight of lithium tetraborate or cobalt internal standard to fall into the cavity of the special hose 23 between the electromagnetic clamp valve 24 and the clamp cylinder 25; the electromagnetic clamp valve 24 is closed, the clamp cylinder 25 is opened, and the material falls through the lower outlet into the platinum crucible 17; after waiting for 6 seconds, the clamp cylinder 25 is automatically closed, completing the rapid feeding action.

[0071] Speed ​​range: 100-200 rpm for coarse weighing; 20-50 rpm for fine weighing. The specific speed can be adjusted according to the flowability of the material.

[0072] The weighing sensors, dedicated shock absorption modules, electrical control cabinets, electromagnetic clamp valves, cylinders, combined cylinders, stepper motors, automatic sample gates, and other components mentioned in this article are all general standard parts or components known to those skilled in the art. No modifications have been made to these devices. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods, so they will not be described in detail here.

[0073] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. An automatic feeding and weighing device for powdered samples, characterized in that, include: The sheet metal frame serves as a support structure for the equipment, supporting and installing its various components. A working platform is located in the middle of the sheet metal frame. The automatic raw material feeding unit is used to place the dispensing bottles containing raw materials and to quantitatively feed the raw materials. The automatic raw material feeding unit is installed on the working platform of the sheet metal frame. The automatic weighing module is used to weigh raw materials and additives. The automatic weighing module is located on the lower front side of the automatic raw material feeding unit. The automatic dispensing unit for cosolvents is used to automatically and quantitatively add additives. The automatic dispensing unit for cosolvents is installed on the upper part of the sheet metal frame and positioned above the automatic weighing module. Automatic sample inlet gate is used to provide a sealed feeding and weighing space to avoid external factors affecting weighing accuracy. The automatic sample inlet gate is installed on the front face of the sheet metal frame via guide rails and can move up and down by a cylinder. The electrical control cabinet is used to control the operation of the equipment. It is installed at the rear of the sheet metal frame and uses a PLC system to control the overall operation algorithm and logic of the equipment.

2. The automatic feeding and weighing device for powdered samples 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 U-shaped trough and a first stepper motor. The first stepper motor is installed on the side of the U-shaped trough and connected to the U-shaped trough through a transmission assembly to drive the U-shaped trough to rotate. The rotating mechanism includes a second stepper motor, which is installed at the bottom of the U-shaped trough. A driven gear and a driving gear are installed inside the U-shaped trough. A fixed sleeve is installed on the driven gear, and a dispensing bottle for holding raw materials is placed inside the fixed sleeve. The second stepper motor drives the dispensing bottle to rotate and feed the raw materials through the gear transmission of the driven gear and the driving gear.

3. The automatic feeding and weighing device for powdered samples according to claim 1, characterized in that: The automatic weighing module includes a weighing sensor and a dedicated shock absorption module. The weighing sensor is mounted on the dedicated shock absorption 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, which is used to hold a quantitatively proportioned raw material and additives.

4. The automatic feeding and weighing device for powdered samples according to claim 3, characterized in that: 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 by a 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 additives, and the closed position is used to cover the platinum crucible during the switching process between the automatic raw material feeding unit and the automatic solvent feeding unit.

5. The automatic feeding and weighing device for powdered samples according to claim 1, characterized in that: The automatic flux feeding unit is mounted on a sheet metal frame via guide rails and a combination cylinder. The combination cylinder uses two SMC rodless cylinders with strokes of 150mm and 50mm respectively. The automatic flux feeding unit has three stations: a middle empty hopper, a lithium tetraborate flux feeding unit on the left, and a cobalt internal standard feeding unit on the right. The combination cylinder is used to switch between stations. Both the cobalt internal standard feeding unit and the lithium tetraborate flux feeding unit include an upper hopper, a lower rapid feeding mechanism, and a precision feeding mechanism.

6. The automatic feeding and weighing device for powdered samples according to claim 5, characterized in that: The rapid feeding mechanism includes a dedicated hose connected to the hopper, an electromagnetic clamping valve clamped on the hose, and a clamping cylinder, with the electromagnetic clamping valve positioned above the clamping cylinder.

7. The automatic feeding and weighing device for powdered samples according to claim 5, characterized in that: The precision feeding mechanism includes, from top to bottom, a third stepper motor, a coupling, a bearing mounting base, and a precision spiral feeding shaft. A conical hopper is installed on the outside of the precision spiral feeding shaft. The conical hopper is connected to the top hopper through a silicone hose. A feeding pipe is installed at the lower end of the conical hopper, 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 feeding and weighing device for powdered samples according to claim 5, characterized in that: A rotary 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.

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