On-site sampling and loading system for powder

Abstract

The utility model discloses an on-site sampling and loading system for powder, which comprises the following components: a sampling unit for extracting a sample from a powder bin; the quantitative filling unit is connected with the sampling unit, the quantitative filling unit comprises a weighing device and a filling device, and the weighing device and the filling device are used for filling a sample container with a certain weight of samples; the container conveying unit comprises a conveying track and a clamping conveying device, the clamping conveying device is located on the conveying track, and the clamping conveying device can clamp the sample container and move along the conveying track; and the cover opening and closing unit is used for taking down the cover body of the sample container from the container opening and installing the cover body on the container opening, and the cover opening and closing unit and the filling device are arranged above the conveying track in a spaced mode.

Description

Technical Field

[0001] The utility model relates to the technical field of powder sampling, in particular to an on-site sampling and loading system for powder materials. Background Art

[0002] For the sampling of some powdered materials, such as cement, manual methods or pneumatic pipeline transportation methods are now mostly used for cement sampling, screening, mixing, weighing, packaging, information reading and handling. The main disadvantages of the manual method are as follows: the effectiveness and accuracy of quality inspection are not high, there are many human interference and subjective factors, it is impossible to carry out intelligent, centralized and standardized management, it is impossible to form a controllable and orderly management mechanism, it is impossible to effectively form a database and ledger, there is no traceability, the labor cost is high, and the labor intensity is high.

[0003] However, when the samples are transported to the designated location through pneumatic pipes for screening, mixing, weighing, packaging and other links, the samples of the upper and lower batches will be mixed during sampling. If there is no good solution, it will affect the authenticity of the sample performance and quality, and thus lose the guiding value for material production. At the same time, when the gas and powder are mixed, there will be serious collisions in the pipeline, which will cause pipeline wear and need to be replaced regularly. The sampling equipment has a short service life, high cost, unstable gas source, complex overall equipment, too long production line, and cannot be well repaired and maintained when the equipment is damaged.

[0004] Prior art CN114397157A discloses a cement sample loading system, including: an opening and closing cover device, used to close the cover on the mouth of the sample barrel and remove the cover from the mouth of the sample barrel; an information label, used to be set on the cover or the sample barrel; a sample receiving device, connected to the cement sample material flow port, used to introduce the sample in the cement sample material flow port into the sample barrel; an information reading and writing device, communicatively connected to the information label, used to read information from the information label and / or write information to the information label; a turnover drive device, used to drive the sample barrel to circulate between the opening and closing cover device, the sample receiving device and the information reading and writing device. This solution does not involve the sampling, mixing, screening and weighing of powder materials, and the equipment is relatively large.

[0005] Prior art CN218925251U discloses an automatic powder screening sampling system, including a sealed bin, a storage hopper and a screen. The storage hopper is arranged on one side of the sealed bin, a collection hopper is arranged along the inner wall of the storage hopper, the collection hopper is connected to the inside of the sealed bin and a lifting mechanism is arranged, the lifting mechanism is used to transport the dust at the collection hopper to the sealed bin, the screen is arranged inside the sealed bin, a vibration motor is arranged at the screen, and a weighing mechanism is arranged above and below the screen. This scheme does not involve the precise weighing and packaging of the powder.

[0006] In view of the above technical problems, the present utility model is specially introduced. Utility Model Content

[0007] The main purpose of the utility model is to provide an on-site sampling and loading system for powder materials, which is used to propose a system solution that can realize on-site quantitative sampling, screening and mixing, weighing and packaging, and information reading of powder materials.

[0008] In order to achieve the above-mentioned purpose, the utility model proposes an on-site sampling and filling system for powder materials, comprising the following components: a sampling unit, the sampling unit is used to extract a sample from a powder material bin; a quantitative filling unit, the quantitative filling unit is connected to the sampling unit, the quantitative filling unit comprises a weighing device and a filling device, the weighing device and the filling device are used to fill a certain weight of the sample into a sample container;

[0009] A container conveying unit, the container conveying unit includes a conveying track and a clamping conveying device, the clamping conveying device is located on the conveying track, and the clamping conveying device can clamp the sample container and move along the conveying track; an opening and closing cover unit, the opening and closing cover unit is used to remove the cover body of the sample container from the container mouth and install the cover body on the container mouth, the opening and closing cover unit and the filling device are arranged above the conveying track at intervals.

[0010] Furthermore, the sampling and loading system also includes a first frame, and the conveying track, the clamping and conveying device and the opening and closing cover unit are integrally installed on the first frame.

[0011] Furthermore, the sampling and loading system also includes an information reading and writing unit, the sample container has an information label, the information reading and writing unit is arranged on the conveying track, and the information reading and writing unit is used to identify information from the information label and / or write information on the information label.

[0012] Furthermore, a docking position and a filling position are respectively provided at both ends of the conveying track, the filling position is below the filling device, the clamping conveying device can move between the docking position and the filling position, and the opening and closing cover unit and the information reading and writing unit are arranged between the docking position and the filling position.

[0013] Furthermore, an aerial transport unit is provided above the first frame, and when the clamping and conveying device is located at the docking position, the aerial transport unit transports the sample container to or from the clamping and conveying device, and the clamping and conveying device includes a three-axis cylinder and a positioning block, and the three-axis cylinder drives the positioning block to clamp or release the sample container.

[0014] Furthermore, the opening and closing cover unit includes a lifting device and a cover rotating device, the lifting device is arranged on the first frame, the lifting device can drive the cover rotating device to perform lifting and lowering movements, the cover rotating device includes a clamping jaw assembly, a rotating drive assembly and a clamping drive assembly, the rotating drive assembly and the clamping drive assembly are both located on the clamping jaw assembly, the rotating drive assembly drives the clamping jaw assembly to rotate, and the clamping drive assembly drives the clamping jaw assembly to tighten and loosen via a lifting connecting shaft.

[0015] Furthermore, the clamping jaw assembly includes a plurality of clamping jaws, each of which is connected to the connecting shaft, an elastic leveling mechanism is provided at the center of the plurality of clamping jaws, and a buffer block is provided at the inner side of the clamping jaws.

[0016] Furthermore, the sampling and loading system also includes a second frame, the second frame is adjacent to the first frame, the sampling unit and the quantitative filling unit are integrally installed on the second frame, and one end of the conveying track extends into the second frame.

[0017] Furthermore, the quantitative filling unit also includes a stirring silo and a quantitative screw conveying device, the stirring silo and the quantitative screw conveying device are supported as a whole on the second frame by the weighing device, and the filling device is located at one end of the quantitative screw conveying device.

[0018] Furthermore, the sampling unit includes a quantitative sampling device and a rotary vibrating screen which are connected to each other, the quantitative sampling device is connected to the powder silo, and the discharge port of the rotary vibrating screen is communicated with the stirring silo.

[0019] By applying the technical solution of the utility model, at least the following beneficial effects are achieved:

[0020] 1. This sampling and loading system is equipped with a sampling unit, a quantitative filling unit, a container conveying unit and an opening and closing cover unit, so that the system can realize automatic sampling of powders, precise weighing, automatic packaging and other processes, avoid human interference, realize an automated, unmanned and intelligent management system, and improve the effectiveness and accuracy of quality inspection.

[0021] 2. This sampling and loading system is equipped with a first rack that integrates a conveying track, a clamping conveying device, an opening and closing cover unit, and an information reading and writing unit, so that the first rack can complete automatic opening, packaging, and intelligent information management of the sample container. The equipment occupies a small area and is convenient and flexible to install and disassemble, which facilitates on-site sampling of the system and avoids various problems caused by too long equipment production lines.

[0022] 3. The sampling and loading system is designed with a lifting device and a screwing device for the cover opening and closing unit, so that the cover opening and closing unit can automatically open and close the sample container. The elastic leveling mechanism is set to ensure that the thread of the sample container can be correctly and effectively screwed without tilting when the clamp is rotated and tightened. The buffer block is set to increase friction to prevent slipping and protect the cover from damage.

[0023] 4. This sampling and loading system integrates a mixing silo, a quantitative screw conveying device, a quantitative sampling device and a rotary vibrating screen by setting up a second frame, so that the second frame can complete automatic quantitative and accurate sampling and screening and mixing. The weighing range of the sampling samples is accurate. The whole system adopts a modular design, which is easy to combine and flexible to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0025] Figure 1 A front schematic diagram of an on-site sampling and loading system according to an embodiment is shown;

[0026] Figure 2 A three-dimensional schematic diagram of a first rack of an embodiment is shown;

[0027] Figure 3 A three-dimensional schematic diagram of an opening and closing cover unit according to an embodiment is shown;

[0028] Figure 4 A cross-sectional view of an opening and closing cover unit according to an embodiment is shown.

[0029] The above drawings include the following reference numerals:

[0030] 1. Powder silo; 2. Weighing device; 3. Filling device; 4. Conveying track; 41. Slider guide rail; 42. Linear module; 5. Clamping conveying device; 51. Three-axis cylinder; 52. Positioning block; 53. Support body; 6. Opening and closing cover unit; 61. Lifting cylinder; 62. Guide rail slider; 63. Motor; 64. Transmission gear set; 65. Clamping cylinder; 66. Connecting shaft; 67. Clamping claw; 68. Elastic leveling mechanism; 69. Buffer block; 7. Information reading and writing unit; 8. Stirring silo; 9. Quantitative screw conveying device; 10. Sample container; 11. First frame; 12. Second frame; 13. Air transport unit; 14. Quantitative sampling device; 15. Vibrating screen. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" indicates the existence of a feature when used, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0033] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0034] Example:

[0035] The utility model proposes a powder on-site sampling and loading system, such as Figure 1 As shown, it includes the following components:

[0036] The sampling unit is used to extract samples from the powder silo 1.

[0037] The quantitative filling unit is connected to the sampling unit. The quantitative filling unit includes a weighing device 2 and a filling device 3. The weighing device 2 and the filling device 3 are used to fill a certain weight of sample into the sample container 10.

[0038] The container conveying unit comprises a conveying track 4 and a clamping and conveying device 5 . The clamping and conveying device 5 is located on the conveying track 4 . The clamping and conveying device 5 can clamp the sample container 10 and move along the conveying track 4 .

[0039] The cover opening and closing unit 6 is used to remove the cover of the sample container 10 from the container opening and install the cover to the container opening. The cover opening and closing unit 6 and the filling device 3 are arranged above the conveying track 4 at intervals.

[0040] This sampling and loading system is equipped with a sampling unit, a quantitative filling unit, a container conveying unit and an opening and closing cover unit, so that the system can realize automatic sampling of powders, precise weighing, automatic packaging and other processes, avoid human interference, realize an automated, unmanned and intelligent management system, and improve the effectiveness and accuracy of quality inspection.

[0041] Specifically, the sampling and loading system further comprises a first frame 11 , and the conveying track 4 , the clamping and conveying device 5 and the opening and closing cover unit 6 are integrally mounted on the first frame 11 .

[0042] Combination Figure 2 As shown, an information reading and writing unit 7 is also arranged on the first rack 11, and the sample container 10 has an information label. The information reading and writing unit 7 is arranged on the conveying track 4, and the information reading and writing unit 7 is used to identify information from the information label and / or write information on the information label.

[0043] The first rack can complete the automatic opening, packaging and intelligent information management of the sample container. The equipment occupies a small area and is convenient and flexible to install and disassemble, which facilitates on-site sampling of the system and avoids various problems caused by too long equipment production lines.

[0044] Preferably, the information reading and writing unit 7 uses a radio frequency identification (RFID) device or a barcode scanning gun device to identify the label or QR code on the cover of the sample container.

[0045] refer to Figure 1 As shown, a docking position and a filling position are respectively provided at both ends of the conveying track 4, the filling position is below the filling device 3, the clamping conveying device 5 can move between the docking position and the filling position, and the opening and closing cover unit 6 and the information reading and writing unit 7 are arranged between the docking position and the filling position.

[0046] Preferably, an aerial transport unit 13 is provided above the first rack 11. When the clamping and conveying device 5 is located at the docking position, the aerial transport unit 13 transports the sample container 10 to or from the clamping and conveying device 5. This arrangement enables the sample container 10 to automatically move back and forth between the docking position and the filling position on the conveying track 4, thereby realizing automatic packaging and information management, and realizing equipment intensification.

[0047] refer to Figure 2As shown, the clamping and conveying device 5 includes a three-axis cylinder 51 and a positioning block 52, and the three-axis cylinder 51 drives the positioning block 52 to clamp or release the sample container 10. Preferably, the clamping and conveying device 5 includes a mobile platform, and a support body 53 is respectively arranged on both sides of the sample container 10 on the mobile platform, and a three-axis cylinder 51 is installed on the support body 53, and the three-axis cylinder 51 is connected to a positioning block 52 adapted to the shape of the outer shell of the sample container 10 to ensure the stability of the clamping of the sample container 10.

[0048] Preferably, the conveying track 4 is configured as two parallel slider rails 41 and a linear module 42 located therebetween. The bottom of the mobile platform is connected to both the slider rails 41 and the linear module 42. The linear module 42 is provided with a stepper motor. The conveying track 4 is provided with photoelectric switches at the docking position, the filling position, the information reading and writing position, and the opening and closing cover position. The stepper motor drives the clamping conveying device 5 to move precisely between the above positions through the linear module.

[0049] Combination Figure 3 and Figure 4 As shown, the cover opening and closing unit 6 includes a lifting device and a cover rotating device, the lifting device is arranged on the first frame 11, and the lifting device can drive the cover rotating device to move up and down. Preferably, the lifting device has a mounting plate fixed to the first frame 11, a lifting cylinder 61 is fixed above the mounting plate, and a guide rail is arranged below, the lifting cylinder 61 is an adjustable stroke cylinder, and the cover rotating device cooperates with the guide rail through the guide rail slider 62, so that the lifting cylinder 61 can drive the cover rotating device to move in the height direction.

[0050] The capping device includes a jaw assembly, a rotating drive assembly and a clamping drive assembly. The rotating drive assembly and the clamping drive assembly are both located on the jaw assembly. The jaw assembly includes a plurality of jaws 67. The rotating drive assembly drives the jaw assembly to rotate. The clamping drive assembly drives the jaw assembly to tighten and loosen through the lifting connecting shaft 66.

[0051] Preferably, the rotation drive assembly includes a servo motor 63, which drives the clamping assembly to rotate by driving the transmission gear set 64. The clamping drive assembly includes a clamping cylinder 65, which can lift the connecting shaft 66. Multiple clamping jaws 67 are connected to the connecting shaft 66 through a connecting rod assembly, so that the clamping cylinder 65 can drive the clamping jaw assembly to tighten and loosen. The opening and closing cover unit can automatically open and close the cover of the sample container, and the design is intensive and compact, which is convenient for installation on the rack.

[0052] Preferably, an elastic leveling mechanism 68 is provided at the center of the plurality of clamping jaws 67, and a buffer block 69 is provided inside the clamping jaws 67. By providing the elastic leveling mechanism, it is ensured that when the clamping jaws are rotated and tightened, the threads of the sample container can be correctly and effectively screwed together without tilting, and by providing the buffer block, friction is increased to prevent slipping, and the cover body is protected from damage.

[0053] like Figure 1 As shown, the sampling and loading system also includes a second frame 12 , which is adjacent to the first frame 11 . The sampling unit and the quantitative filling unit are integrated and installed on the second frame 12 , and one end of the conveying track 4 extends into the second frame 12 .

[0054] Specifically, the quantitative filling unit further includes a stirring silo 8 and a quantitative screw conveying device 9 . The stirring silo 8 and the quantitative screw conveying device 9 are integrally supported by a weighing device 2 on the second frame 12 . The filling device 3 is located at one end of the quantitative screw conveying device 9 .

[0055] The sampling unit includes a quantitative sampling device 14 and a rotary vibrating screen 15 which are connected to each other. The quantitative sampling device 14 is connected to the powder material bin 1, and the discharge port of the rotary vibrating screen 15 is connected to the mixing bin 8. The quantitative sampling device 14 is used to roughly measure the powder material. Then, the weighing device 2 is used to accurately measure the mixing bin 8 and the quantitative screw conveying device 9. The sampling weight range is very accurate, and the accuracy of the entire system can reach ±0.5%.

[0056] The sampling and loading system integrates a mixing silo, a quantitative screw conveying device, a quantitative sampling device and a rotary vibrating screen by setting up a second frame, so that the second frame can complete automatic quantitative and accurate sampling and screening and mixing. The weighing range of the sampling samples is accurate. The whole system adopts a modular design, which is easy to combine and flexible to install and disassemble.

[0057] In summary, the specific process flow of the sampling and loading system is as follows: cement powder is taken out from the original factory powder silo 1 through the quantitative sampling device 14, and is graded and screened by the rotary vibrating screen 15. The unqualified ones are discharged to the recovery bin through the slag discharge port, and the qualified powder is transported to the mixing silo 8 for stirring and mixing. After sufficient mixing meets the standard requirements, the quantitative bolt conveying device 9 is used to start the filling, and the weighing device 2 is used for accurate weighing.

[0058] At the same time, the sample container 10 is lifted by the aerial conveying unit 13 to the clamping conveying device 5, reaches the information reading and writing unit 7 through the conveying track 4 to read the information and upload it to the upper computer system for storage, then reaches the opening and closing cover unit 6 to open the cover body, and then reaches the filling device 3, the quantitative bolt conveying device is started, and the sample is filled into the sample container. At this time, a process cycle is completed, and then the sample cover body is tightened through the opening and closing cover unit 6 in turn through the conveying track 4. The information reading and writing unit 7 reads the information again. After completion, it is sent to the designated position or sample storage room by the aerial conveying unit 13. The entire process cycle is completed and can be set according to different process requirements or factory standards, and then the above process cycle work is repeated.

[0059] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0060] 1. This sampling and loading system is equipped with a sampling unit, a quantitative filling unit, a container conveying unit and an opening and closing cover unit, so that the system can realize automatic sampling of powders, precise weighing, automatic packaging and other processes, avoid human interference, realize an automated, unmanned and intelligent management system, and improve the effectiveness and accuracy of quality inspection.

[0061] 2. This sampling and loading system is equipped with a first rack that integrates a conveying track, a clamping conveying device, an opening and closing cover unit, and an information reading and writing unit, so that the first rack can complete automatic opening, packaging, and intelligent information management of the sample container. The equipment occupies a small area and is convenient and flexible to install and disassemble, which facilitates on-site sampling of the system and avoids various problems caused by too long equipment production lines.

[0062] 3. The sampling and loading system is designed with a lifting device and a screwing device for the cover opening and closing unit, so that the cover opening and closing unit can automatically open and close the sample container. The elastic leveling mechanism is set to ensure that the thread of the sample container can be correctly and effectively screwed without tilting when the clamp is rotated and tightened. The buffer block is set to increase friction to prevent slipping and protect the cover from damage.

[0063] 4. This sampling and loading system integrates a mixing silo, a quantitative screw conveying device, a quantitative sampling device and a rotary vibrating screen by setting up a second frame, so that the second frame can complete automatic quantitative and accurate sampling and screening and mixing. The weighing range of the sampling samples is accurate. The whole system adopts a modular design, which is easy to combine and flexible to install and disassemble.

[0064] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A powder on-site sampling and loading system, characterized in that: Includes the following components: A sampling unit, the sampling unit being used to extract a sample from the powder material silo (1); A quantitative filling unit, the quantitative filling unit being connected to the sampling unit, the quantitative filling unit comprising a weighing device (2) and a filling device (3), the weighing device (2) and the filling device (3) being used to fill a certain weight of the sample into a sample container (10); A container conveying unit, the container conveying unit comprising a conveying track (4) and a clamping conveying device (5), the clamping conveying device (5) being located on the conveying track (4), and the clamping conveying device (5) being capable of clamping the sample container (10) and moving along the conveying track (4); An opening and closing cover unit (6) is used to remove the cover of the sample container (10) from the container mouth and to install the cover on the container mouth. The opening and closing cover unit (6) and the filling device (3) are arranged above the conveying track (4) with a spacing therebetween.

2. The sampling and loading system according to claim 1, characterized in that: The sampling and loading system further comprises a first frame (11), and the conveying track (4), the clamping and conveying device (5) and the opening and closing cover unit (6) are integrally mounted on the first frame (11).

3. The sampling and loading system according to claim 2, characterized in that: The sampling and loading system further comprises an information reading and writing unit (7), the sample container (10) has an information label, the information reading and writing unit (7) is arranged on the conveying track (4), and the information reading and writing unit (7) is used to identify information from the information label and / or write information on the information label.

4. The sampling and loading system according to claim 3, characterized in that: A docking position and a filling position are respectively arranged at both ends of the conveying track (4), the filling position is below the filling device (3), the clamping conveying device (5) can move between the docking position and the filling position, and the opening and closing cover unit (6) and the information reading and writing unit (7) are arranged between the docking position and the filling position.

5. The sampling and loading system according to claim 4, characterized in that: An aerial transport unit (13) is arranged above the first frame (11). When the clamping and conveying device (5) is located at the docking position, the aerial transport unit (13) transports the sample container (10) to the clamping and conveying device (5) or transports it away from the clamping and conveying device (5). The clamping and conveying device (5) comprises a three-axis cylinder (51) and a positioning block (52). The three-axis cylinder (51) drives the positioning block (52) to clamp or release the sample container (10).

6. The sampling and loading system according to any one of claims 2 to 5, characterized in that: The opening and closing cover unit (6) comprises a lifting device and a cover rotating device. The lifting device is arranged on the first frame (11). The lifting device can drive the cover rotating device to perform lifting and lowering movements. The cover rotating device comprises a clamping jaw assembly, a rotating drive assembly and a clamping drive assembly. The rotating drive assembly and the clamping drive assembly are both located on the clamping jaw assembly. The rotating drive assembly drives the clamping jaw assembly to rotate. The clamping drive assembly drives the clamping jaw assembly to tighten and loosen via a lifting connection shaft (66).

7. The sampling and loading system according to claim 6, characterized in that: The clamping jaw assembly comprises a plurality of clamping jaws (67), each of which is connected to the connecting shaft (66), an elastic leveling mechanism (68) is provided at the center of the plurality of clamping jaws (67), and a buffer block (69) is provided on the inner side of the clamping jaw (67).

8. The sampling and loading system according to claim 2, characterized in that: The sampling and loading system further comprises a second frame (12), wherein the second frame (12) is adjacent to the first frame (11), the sampling unit and the quantitative filling unit are integrally mounted on the second frame (12), and one end of the conveying track (4) extends into the second frame (12).

9. The sampling and loading system according to claim 8, characterized in that: The quantitative filling unit further comprises a stirring silo (8) and a quantitative screw conveying device (9), wherein the stirring silo (8) and the quantitative screw conveying device (9) are integrally supported by the weighing device (2) on the second frame (12), and the filling device (3) is located at one end of the quantitative screw conveying device (9).

10. The sampling and loading system according to claim 9, characterized in that: The sampling unit comprises a quantitative sampling device (14) and a rotary vibrating screen (15) which are connected to each other. The quantitative sampling device (14) is connected to the powder material bin (1), and the discharge port of the rotary vibrating screen (15) is connected to the stirring material bin (8).

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