Microgram powder automatic weighing device

Abstract

This invention discloses an automatic weighing device for micro-gram powders, relating to the field of micro-weighing technology. It includes a feeding structure, a subdivision structure, a weighing structure, and a container transfer structure arranged sequentially from top to bottom. The feeding structure includes a hopper with a first subdivision mesh at the hopper outlet. The first subdivision mesh has first mesh holes for powder to fall through, and a first driving structure drives a sealing plate to block and open the first mesh holes. The subdivision structure includes a subdivision space with a continuously oscillating second subdivision mesh at the subdivision inlet. A second driving structure drives a subdivision drum to rotate, and a third driving structure drives a container to tilt, pouring out the powder from the container. The container transfer structure includes a rotating lifting platform and a gripping robot mounted on the rotating lifting platform. Through the feeding structure, subdivision structure, weighing structure, and container transfer structure, automatic weighing and conveying of powders are achieved, thereby reducing manual labor intensity and improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of micro-weighing technology, and in particular to an automatic weighing device for microgram powders. Background Technology

[0002] Micro-metering powders require high precision and small weighing weights, usually measured in grams. However, existing micro-metering methods require manual weighing, which is labor-intensive, inaccurate, and inefficient in continuous operations, making it unsuitable for mass production. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic weighing device for microgram powders. This automatic weighing device for microgram powders achieves high-precision automatic weighing of powders through an automated multi-stage subdivision structure, eliminating tedious manual steps, shortening working time, and improving work efficiency.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] An automatic weighing device for microgram powder includes a feeding structure, a fine-division structure, a weighing structure, and a container transfer structure arranged sequentially from top to bottom. The feeding structure includes a hopper with a hopper inlet and a hopper outlet. A first fine-division mesh is provided on the hopper outlet, with first mesh openings for powder to fall through. A sealing plate is provided at the bottom of the first fine-division mesh, and a first driving structure is driven to the sealing plate to cover and open the first mesh openings. The fine-division structure includes a lower outer shell, the interior of which encloses a fine-division space. A fine-division inlet is provided above the fine-division space, and a fine-division outlet is provided below the fine-division inlet. A continuous feed valve is provided on the fine-division inlet. The second subdividing mesh is oscillating, and a subdividing drum is rotatably installed within the subdividing space. A second driving structure is connected to the subdividing drum, which drives the subdividing drum to rotate. Subdividing grooves are evenly arranged around the circumference of the subdividing drum, and the diameter of the subdividing drum matches the diameter of the subdividing space. The weighing structure includes a holding dish located at the bottom of the subdividing outlet. A weight sensor is installed at the bottom of the holding dish. A third driving structure is connected to the holding dish, which drives the holding dish to tilt and pour out the powder inside. The container transfer structure includes a rotating lifting platform and a gripping robot mounted on the rotating lifting platform, which grips the container bottle.

[0006] A feeding switch is provided between the feeding structure and the subdivision structure. The feeding switch includes a feeding bin with a feeding bin inlet and a feeding bin outlet. The feeding bin inlet and the feeding bin outlet are staggered vertically. The feeding bin inlet is located at the bottom of the sealing plate. A slider is slidably installed inside the feeding bin. The slider slides from the feeding bin inlet to the feeding bin outlet. The slider is driven by a fifth driving structure that allows the slider to slide. The slider pushes the powder in the feeding bin to the feeding bin outlet. A stop block is connected to the slider, which completely blocks the feeding bin outlet.

[0007] A first spring is provided between the end of the stop block and the end adjacent to the feeding bin.

[0008] The fifth drive structure is connected to the first drive structure and is controlled by the same linear motor.

[0009] The lower outer shell also includes a coarse separating space located above the subdividing space. The coarse separating space has a coarse separating inlet and a coarse separating outlet. The coarse separating inlet is connected to the hopper outlet, and the coarse separating outlet is connected to the subdividing inlet. A coarse separating drum is rotatably mounted within the coarse separating space. The second drive includes a coarse separating drum drive structure and a subdividing drum drive structure. The coarse separating drum drive structure is driven by the coarse separating drum, and the subdividing drum drive structure is driven by the subdividing drum. Coarse separating grooves are evenly distributed around the coarse separating drum. The diameter of the coarse separating drum matches the diameter of the coarse separating space, and the volume of the coarse separating grooves is larger than the volume of the subdividing grooves.

[0010] The lower outer shell is provided with a second subdivision mesh drive motor. A flange is fixed on the output shaft of the second subdivision mesh drive motor. A ball joint connecting rod is provided between the flange and the second subdivision mesh. One end of the ball joint connecting rod is hinged to the non-center position of the flange, and the other end is hinged to one side of the second subdivision mesh.

[0011] The gripping robot is connected to a gripping drive structure. The gripping robot is mounted on a rotating lifting platform. The rotating lifting platform is equipped with a drive mechanism that drives the rotating lifting platform to rotate and lift.

[0012] The third drive structure includes a tilting motor, an tilting cam fixed on the output shaft of the tilting motor, one end of the container hinged to the mounting plate, and the bottom of the container in contact with the tilting cam.

[0013] A ball joint is also provided between the first driving structure, the slider, and the sealing plate.

[0014] After adopting the above technical solution, the beneficial effects of the present invention are:

[0015] This invention discloses an automatic weighing device for microgram powder, comprising a feeding structure, a fine-division structure, a weighing structure, and a container transfer structure arranged sequentially from top to bottom. The feeding structure includes a hopper with a hopper inlet and a hopper outlet. A first fine-division mesh is provided on the hopper outlet, with first mesh openings for powder to fall through. A sealing plate is provided at the bottom of the first fine-division mesh, and a first driving structure is driven to the sealing plate to cover and open the first mesh openings. The fine-division structure includes a lower outer shell, the interior of which encloses a fine-division space. A fine-division inlet is provided above the fine-division space, and a fine-division outlet is provided below the fine-division inlet. The fine-division inlet is provided with... The second subdivision mesh is oscillating, and a subdivision drum is rotatably installed within the subdivision space. A second drive structure is connected to the subdivision drum, which drives the subdivision drum to rotate. Subdivision grooves are evenly arranged around the circumference of the subdivision drum, and the diameter of the subdivision drum matches the diameter of the subdivision space. The weighing structure includes a holding dish located at the bottom of the subdivision outlet. A weight sensor is installed at the bottom of the holding dish. A third drive structure is connected to the holding dish, which drives the holding dish to tilt and pour out the powder inside. The container transfer structure includes a rotary lifting platform and a gripping robot mounted on the rotary lifting platform, which grips the container bottle. Through the feeding structure, subdivision structure, weighing structure, and container transfer structure, automatic weighing and conveying of powder are achieved. The entire process is automated, thereby reducing manual labor intensity, enabling continuous operation, and improving work efficiency. The powder is first subdivided by the first subdivision mesh, and then the powder is more evenly distributed into the subdivision grooves on the surface of the subdivision drum by the second subdivision mesh. The second subdivision mesh further subdivides the powder, and the subdivision grooves transport the subdivided powder, thereby greatly improving the powder precision and reducing operational errors.

[0016] By setting sliders and stops, intermittent unloading is achieved, preventing residual powder from continuing to fall after a working cycle of powder weighing is completed, which would cause large powder weighing errors.

[0017] By incorporating a first spring, the rapid reset of the stop is ensured.

[0018] By setting up a coarse-grinding drum, the finer mesh size of the powder can be further improved, maximizing the weighing accuracy.

[0019] In summary, the automatic weighing device for microgram powder of the present invention solves the technical problems of low weighing accuracy and difficulty in achieving automated continuous production in the prior art. The present invention realizes automatic weighing and conveying of powder through a feeding structure, a subdivision structure, a weighing structure, and a container transfer structure. The entire process is automatically controlled, thereby reducing the intensity of manual labor, realizing continuous operation, and improving work efficiency. The powder is first subdivided by a first subdivision mesh, and the powder is more evenly distributed into the subdivision grooves on the surface of the subdivision drum by a second subdivision mesh. The second subdivision mesh further subdivides the powder, and the subdivision grooves transport the subdivided powder, thereby greatly improving the powder weighing accuracy and reducing operational errors. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an automatic weighing device for microgram powder according to the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the central feeding structure;

[0022] Figure 3 yes Figure 1 Schematic diagram of the middle feeding switch;

[0023] Figure 4 yes Figure 1 A schematic diagram of the subdivided structure;

[0024] Figure 5 yes Figure 1 Schematic diagram of the weighing structure in the middle;

[0025] Figure 6 yes Figure 1 A schematic diagram of the medium-sized container bottle transfer structure;

[0026] Figure 7 This is a schematic diagram of the second drive structure;

[0027] Figure 8 This is a schematic diagram of the structure of the second subdivision mesh drive motor;

[0028] Figure 9 This is a schematic diagram of the gripping robotic arm;

[0029] In the diagram: 1. Feeding structure; 11. Upper outer shell; 12. Hopper; 121. Hopper inlet; 122. Hopper outlet; 13. Top cover; 131. Magnet; 14. Powder level detection sensor; 15. First fine mesh; 151. First mesh opening; 152. Protrusion; 2. Discharge switch; 21. Discharge bin; 211. Discharge bin inlet; 212. Discharge bin outlet; 213. Baffle; 22. Sealing plate; 23. Slider; 231. Drive shaft; 24. First drive structure; 24 1. First flange; 242. Ball joint; 243. First ball joint cover; 244. Second ball joint cover; 221. First connecting plate; 222. Second connecting plate; 27. Fixing block; 25. Stop block; 26. First spring; 3. Subdivision structure; 301. Upper guide shell; 302. First baffle; 303. Lower guide shell; 304. Second baffle; 305. First support plate; 306. Second support plate; 31. Lower outer shell; 32. Coarse subdivision space; 33. Subdivision space; 34. Coarse subdivision rotation. 341. Coarse material separating groove; 342. Coarse material separating drum drive structure; 35. Fine material separating drum; 351. Fine material separating groove; 352. Fine material separating drum drive structure; 36. Second fine material separating mesh; 361. Second fine material separating mesh drive motor; 362. Flange; 363. Ball joint connecting rod; 4. Weighing structure; 41. Container; 411. Weighing platform; 412. Weight sensor; 42. Mounting plate; 421. Mounting plate hinge point; 43. Inclined cam; 44. Return spring; 5. Container bottle Transfer structure, 51. Gripping robot, 511. Gripper, 512. Mounting wall, 513. Return spring, 514. Electromagnet, 515. Armature, 52. Rotary lifting platform, 521. Rotary platform, 5211. Rotary shaft, 5212. Large pulley, 5213. Rotary motor, 5214. Toothed belt, 522. Lifting platform, 5221. Support base, 5222. Lifting cam, 5223. Pressing wheel, 5224. Ejection spring, 6. Container bottle, 7. Frame. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] The directions mentioned in this manual are based on the directions shown in the attached diagram and represent only relative positional relationships, not absolute positional relationships.

[0032] like Figure 1 As shown, an automatic weighing device for microgram powder includes a feeding structure 1, a subdivision structure 3, a weighing structure 4, and a container transfer structure 5 arranged sequentially from top to bottom.

[0033] like Figure 1 and Figure 2As shown, the feeding structure 1 includes an upper outer shell 11, within which a hopper 12 is fixedly installed. The hopper 12 is a conical cylinder. The largest diameter opening at the top of the hopper 12 is the hopper inlet 121, and the smallest diameter opening at the bottom of the hopper 12 is the hopper outlet 122. In this embodiment, the top of the hopper inlet 121 is flush with the top of the upper outer shell 11. In practical applications, the top of the upper outer shell 11 can be higher than the hopper inlet 121; this is not a limitation in this embodiment. The upper outer shell 11 effectively protects the hopper 12. A top cover 13 covers the top of the hopper inlet 121. One end of the top cover 13 is hinged to one side of the hopper outlet 122, and the other end is equipped with a magnet 131. The top cover 13 is attracted to the hopper inlet 121 by the magnet 131, thereby sealing the hopper 12 and ensuring that the powder inside is not affected by the outside environment. A powder level detection sensor 14 is installed on the top cover 13. The powder level detection sensor 14 can be an ultrasonic position sensor, a laser rangefinder, or an infrared rangefinder, etc., as long as it can measure the powder level in the hopper 12. This embodiment does not impose any restrictions on this. A first fine mesh 15 is installed at the hopper outlet 122, and the first fine mesh 15 has first mesh holes 151. In order to make the powder discharge smoother, protrusions 152 are provided above the first fine mesh 15. The protrusions 152 are located on both sides of the first mesh holes 151, so that the powder above can be smoothly guided into the first mesh holes 151, thereby facilitating the discharge.

[0034] like Figure 1 and Figure 3As shown in the figure, a feeding switch 2 is also provided below the feeding structure 1. The feeding switch 2 includes a feeding bin 21, which is a horizontally arranged circular cylinder. A baffle 213 is provided at the right end of the feeding bin 21, which seals the right side of the feeding bin 21. A feeding bin inlet 211 and a feeding bin outlet 212 are provided on the circular cylinder wall of the feeding bin 21. The feeding bin inlet 211 and the feeding bin outlet 212 are staggered vertically. In this embodiment, the hopper inlet 211 is located to the left of the hopper outlet 212. The hopper inlet 211 connects to the hopper outlet 122. A sealing plate 22 is provided above the hopper inlet 211. The sealing plate 22 is slidably installed on the outer wall of the hopper 21. The sealing plate 22 has sealing holes that correspond to the first mesh opening 151. A first driving structure 24 is connected to the sealing plate 22. The first driving structure 24 drives the sealing plate 22 to slide back and forth, thereby covering and opening the first mesh opening 151. In this embodiment, the first driving structure 24 is a linear motor. In practical applications, it can be designed as an electric push rod or an electric cylinder as needed. This embodiment does not limit this. A slider 23 is slidably installed inside the hopper 21. The slider 23 contacts the inner wall of the hopper 21. The sliding direction of the slider 23 is from the hopper inlet 211 to the hopper outlet 212, that is, the slider 23 slides from left to right inside the hopper 21. The slider 23 is connected to a fifth drive structure for sliding. To ensure synchronization, in this embodiment, the fifth drive structure is connected to the first drive structure 24 and controlled by the same linear motor. The drive structure 24 is fixedly mounted on the first flange 241, which is mounted on the outside of the upper housing 11. A ball joint 242 is fixedly mounted on the output shaft of the first drive structure 24, which passes through the first ball joint cover 243. The drive shaft 231 of the slider 23 passes through the discharge bin 21 and is fixedly connected to the second ball joint cover 244. By using the ball joint 242, the installation difficulty of the equipment can be reduced. The second ball hinge cover 244 is also provided with a first connecting plate 221. The first connecting plate 221 is fixedly connected to the second ball hinge cover 244 by screws. The first connecting plate 221 is fixed with a second connecting plate 222 by screws. The first connecting plate 221 and the second connecting plate 222 pass through the through hole opened on the left end face of the upper outer shell 11 respectively. The second connecting plate 222 has a groove inside and a sealing plate 22 is installed. A fixing block 27 is fixedly installed on the outer wall of the feeding bin 21. The second connecting plate 222 is slidably installed on the fixing block 27. The fixing block 27 is located on both sides of the lower end of the hopper discharge port 122, and the lower end face of the hopper discharge port 122 abuts against the upper end face of the second connecting plate 222.

[0035] When the ball joint 242 reciprocates under the drive of the first drive structure 24, it drives the second connecting plate 222 connected to the first connecting plate 221 to reciprocate, thereby driving the sealing plate 22 inside the second connecting plate 222 to reciprocate. As a result, the sealing plate hole and the first mesh hole 151 continuously overlap and misalign, thereby controlling the powder to fall intermittently into the feed hopper inlet 211.

[0036] The other end of slider 23 (right end in the figure) is connected to a stop block 25. The stop block 25 is identical to slider 23 and is also slidably installed inside the feeding hopper 21, contacting the inner wall of the feeding hopper 21. Initially, the stop block 25 completely blocks the feeding hopper outlet 212. A first spring 26 is provided between the adjacent ends of the stop block 25 and the feeding hopper 21, clamping the stop block 25 between the feeding hopper 21 and the feeding hopper 21. When the powder falls into the feeding hopper 21, the first drive structure 24 drives slider 23 to reciprocate, thereby pushing the powder in the feeding hopper 21 to the feeding hopper outlet 212 for discharge. On the return trip, the stop block 25 blocks the feeding hopper inlet 211.

[0037] like Figure 1 , Figure 4 and Figure 7 As shown, the subdivision structure 3 includes a lower outer shell 31, which encloses a coarse dividing space 32 and a subdivision space 33. The coarse dividing space 32 is located above the subdivision space 33 and is interconnected with it. A first baffle 302 is fixedly installed inside the upper guide shell 301, which encloses the coarse dividing space 32. The coarse dividing space 32 is provided with a coarse dividing inlet and a coarse dividing outlet, which are connected to the coarse dividing space 32. The coarse dividing inlet is connected to the discharge bin outlet 212 above and is located directly below the discharge bin outlet 212. A coarse dividing drum 34 is rotatably installed inside the coarse dividing space 32. Coarse dividing grooves 341 are evenly arranged around the coarse dividing drum 34. The diameter of the coarse dividing drum 34 matches the diameter of the coarse dividing space 32, and the contact surfaces of the coarse dividing drum 34 and the coarse dividing space 32 abut against each other. A coarse separator rotating drum 34 is connected to a coarse separator rotating drum drive structure 342, which drives the coarse separator rotating drum 34 to rotate. The coarse separator rotating drum 34 is located directly below the coarse separator feed inlet.

[0038] Inside the lower outer casing 31, a lower guide shell 303 is also fixed. The lower guide shell 303 is located inside the lower outer casing 31, and a second baffle 304 is fixedly installed inside the lower guide shell 303. The second baffle 304 encloses a subdivision space 33, which has a subdivision inlet and a subdivision outlet, connected to each other. The subdivision inlet connects to the coarse separation outlet. A subdivision drum 35 is rotatably mounted inside the subdivision space 33. Subdivision grooves 351 are evenly distributed around the circumference of the subdivision drum 35. The volume of the coarse separation grooves 341 is larger than the volume of the subdivision grooves 351. The diameter of the subdivision drum 35 matches the diameter of the subdivision space 33, and the contact surfaces of the subdivision drum 35 and the subdivision space 33 abut against each other. A subdivision drum drive structure 352 is connected to the subdivision drum 35, driving the subdivision drum 35 to rotate. The coarse dividing drum drive structure 342 and the fine dividing drum drive structure 352 constitute the second drive structure. Both the coarse dividing drum drive structure 342 and the fine dividing drum drive structure 352 are connected to reducers. The coarse dividing drum 34 rotates counterclockwise, and the fine dividing drum 35 rotates clockwise.

[0039] like Figure 1 , Figure 4 and Figure 8 As shown, a continuously oscillating second fine screen 36 is arranged between the fine feed inlet and the coarse discharge outlet. A first support plate 305 is fixed to the bottom of the upper guide shell 301, and a second support plate 306 is fixed to the top of the lower guide shell 303. The first support plate 305 is fixed to the upper end face of the second support plate 306, and the second fine screen 36 is slidably installed in the groove of the first support plate 305. A second fine screen drive motor 361 is arranged on the outside of the lower outer shell 31. A flange 362 is fixed on the output shaft of the second fine screen drive motor 361. A ball joint connecting rod 363 is arranged between the flange 362 and the second fine screen 36. One end of the ball joint connecting rod 363 is hinged to the non-center position of the flange 362, and the other end is hinged to one side of the second fine screen 36. The rotation of the second fine screen drive motor 361 drives the flange 362 to rotate, thereby driving the second fine screen 36 to slide back and forth in the first support plate 305, thus realizing continuous screening.

[0040] like Figure 1 and Figure 5As shown, the weighing structure 4 includes a mounting plate 42 and a container 41 mounted on the mounting plate 42. The container 41 is located at the bottom of the fine dispensing port, ensuring that the powder falls from the fine dispensing drum 35 into the container 41. The container 41 is shaped like a spoon. A weighing platform 411 is provided at the bottom of the container 41, and a weight sensor 412 is provided on the weighing platform 411 to measure the weight of the powder in the container 41. The weighing platform 411 is hinged to the mounting plate 42 in the middle, and the weighing platform 411 can rotate around the hinge point 421 of the mounting plate. A third drive structure is connected to the container 41. The third drive structure drives the container 41 to tilt and pour out the powder inside the container 41. The third drive structure includes a tilting motor (not shown in the figure). A tilting cam 43 is fixed on the output shaft of the tilting motor. The wheel surface of the tilting cam 43 contacts the bottom of one end of the weighing platform 411. The tilting cam 43 supports the container 41 and ensures that it tilts. A return spring 44 is also provided between the bottom of the weighing platform 411 and the mounting plate 42 to ensure that the weighing platform 411 is reset.

[0041] like Figure 1 , Figure 6 and Figure 9 As shown, the container bottle transfer structure 5 includes a gripping robot 51 and a rotary lifting platform 52. The gripping robot 51 is connected to a gripping drive structure and is mounted on the rotary lifting platform 52. The rotary lifting platform 52 is provided with a drive mechanism that drives the rotary lifting platform 52 to rotate and lift.

[0042] In this embodiment, the gripping robot 51 includes two opposing grippers 511, which are hinged to the mounting wall 512 of the gripping robot. A return spring 513 is provided between the two grippers 511, and an electromagnet 514 is provided on the top of the grippers 511. An armature 515 extending between the two grippers 511 is provided on the electromagnet 514. When the electromagnet 514 is energized, the armature 515 pushes forward, and the grippers 511 clamp against the spring force of the clamping spring 513. When the designated position is reached, the electromagnet 514 is de-energized, the armature 515 moves backward, the grippers 511 open, and the container bottle 6 is placed in the designated position. The empty container bottle 6 is then removed and placed back into the initial position. The electromagnet 514 is fixed by bolts, and the output shaft is screwed to the armature 515.

[0043] The rotary lifting platform 52 includes a lifting platform 522 and a rotary platform 521. A gripping robot 51 is mounted on the lifting platform 522, and the lifting platform 522 is mounted on the rotary platform 521. The rotary platform 521 is rotatably mounted on the frame 7. A rotating shaft 5211 is located at the center of the bottom of the rotary platform 521. A large pulley 5212 is fixed on the rotating shaft 5211. A rotary motor 5213 is fixedly mounted on the frame 7. A toothed belt 5214 is fixed to the output shaft of the rotary motor 5213 and connected by screws. The large pulley 5212 and the toothed belt 5214 are connected by a belt drive, thereby driving the rotary platform 521 to rotate via the rotary motor 5213. The bottom of the lifting platform 522 is hinged to the rotating platform 521 via a support base 5221. A gripping robot 51 is mounted on the left side of the lifting platform 522. A lifting motor is fixedly mounted on the rotating platform 521, and a lifting cam 5222 is fixedly mounted on the output shaft of the lifting motor. A pressing wheel 5223 is located on the right side of the lifting platform 522, corresponding to the lifting cam 5222, and the lifting cam 5222 contacts the pressing wheel 5223. An ejection spring 5224 is located between the lifting platform 522 and the rotating platform, positioned between the support base 5221 and the pressing wheel 5223. When the lifting motor rotates, it drives the lifting cam 5222 to move at a constant speed. When the lifting cam 5222 reaches its highest point, the lifting platform 522 descends, causing the gripping robot arm 51 installed at the other end of the lifting platform 522 to rise. When the lifting cam 5222 disengages from the pressing wheel 5223, the ejecting spring 5224 controls the lifting cam 5222 to reset, thereby achieving the purpose of lifting.

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown in the figure, the working process of an automatic weighing device for microgram powder is as follows:

[0045] The powder is stored in the hopper 12. Under the action of the first drive structure 24, the sealing plate 22 reciprocates, causing the sealing plate hole and the first mesh hole 151 to continuously overlap and misalign. This controls the intermittent falling of the powder into the feed hopper inlet 211. Once the powder falls into the feed hopper 21, the first drive structure 24 drives the slider 23 to reciprocate, pushing the powder in the feed hopper 21 to the feed hopper outlet 212 for discharge. Upon return, the stop block 25 blocks the feed hopper inlet 211, and the powder enters the coarse separation space 33, then passes through the coarse separation groove 3 on the coarse separation drum 34. 41. The powder is conveyed downwards from the coarse feed port into the fine feed port. Then, under the action of the second fine mesh 36, it is finely and evenly distributed in the fine material groove 351 of the fine rotating drum 35. The conveying continues, and then the powder enters the holding dish 41 from the fine feed port. When the weight sensor 412 senses that the amount of powder is appropriate, the fine rotating drum 35 stops rotating. The tilting motor controls the holding dish 41 to tilt, and the powder enters the container bottle 6. Then, it is picked up by the gripping robot and conveyed away by the rotating lifting platform. The empty container bottle 6 is placed below the holding dish 41, and the fine rotating drum 35 starts again to enter the next cycle.

[0046] This invention provides an automatic microgram powder weighing device that solves the technical problems of low powder weighing accuracy and difficulty in achieving automated continuous production in existing technologies. The invention achieves automatic powder weighing and conveying through a feeding structure, a subdivision structure, a weighing structure, and a container transfer structure. The entire process is automated, reducing manual labor intensity, enabling continuous operation, and improving work efficiency. The powder is first subdivided by a first subdivision mesh, and then further subdivided by a second subdivision mesh, which distributes the powder more evenly into the subdivision grooves on the surface of the subdivision drum. The second subdivision mesh further subdivides the powder, and the subdivision grooves transport the subdivided powder, thereby significantly improving powder weighing accuracy and reducing operational errors.

[0047] This invention is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort are within the scope of protection of this invention.

Claims

1. An automatic weighing device for microgram powder, characterized in that: It includes, from top to bottom, a feeding structure, a subdivision structure, a weighing structure, and a container transfer structure. The feeding structure includes a hopper, which is provided with a hopper inlet and a hopper outlet. A first fine mesh is provided on the hopper outlet, and the first fine mesh is provided with a first mesh hole for powder to fall through. A sealing plate is provided at the bottom of the first fine mesh, and a first driving structure is driven to the sealing plate. The first driving structure drives the sealing plate to cover and open the first mesh hole. The subdivision structure includes a lower outer shell, the interior of which encloses a subdivision space. A subdivision inlet is provided above the subdivision space, and a subdivision outlet is provided below it. A continuously oscillating second subdivision mesh is provided on the subdivision inlet. A subdivision rotating drum is rotatably installed inside the subdivision space. A second driving structure is connected to the subdivision rotating drum, and the second driving structure drives the subdivision rotating drum to rotate. Subdivision grooves are uniformly provided around the circumference of the subdivision rotating drum, and the diameter of the subdivision rotating drum matches the diameter of the subdivision space. The weighing structure includes a container, which is located at the bottom of the subdivided discharge port. A weight sensor is provided at the bottom of the container, and a third driving structure is connected to the container. The third driving structure drives the container to tilt and pour out the powder inside the container. The container transfer structure includes a rotary lifting platform and a gripping robot mounted on the rotary lifting platform, the gripping robot gripping the container bottle.

2. The automatic weighing device for microgram powder according to claim 1, characterized in that: A feeding switch is provided between the feeding structure and the subdivision structure. The feeding switch includes a feeding bin with a feeding bin inlet and a feeding bin outlet. The feeding bin inlet and the feeding bin outlet are staggered vertically. The feeding bin inlet is located at the bottom of the sealing plate. A slider is slidably installed inside the feeding bin. The slider slides from the feeding bin inlet to the feeding bin outlet. The slider is driven by a fifth driving structure that allows the slider to slide. The slider pushes the powder in the feeding bin to the feeding bin outlet. A stop block is connected to the slider. The stop block completely blocks the feeding bin outlet.

3. The automatic weighing device for microgram powder according to claim 2, characterized in that: A first spring is provided between the end of the stop block and the end adjacent to the discharge bin.

4. The automatic weighing device for microgram powder according to claim 2, characterized in that: The fifth drive structure is connected to the first drive structure and is controlled by the same linear motor.

5. The automatic weighing device for microgram powder according to claim 1, characterized in that: A coarse separating space is also provided on the lower outer shell above the subdividing space. The coarse separating space is provided with a coarse separating inlet and a coarse separating outlet. The coarse separating inlet is connected to the hopper outlet, and the coarse separating outlet is connected to the subdividing inlet. A coarse separating drum is rotatably installed in the coarse separating space. The second drive motor includes a coarse separating drum drive structure and a subdividing drum drive structure. The coarse separating drum drive structure is driven by the coarse separating drum, and the subdividing drum drive structure is driven by the subdividing drum. Coarse separating grooves are uniformly provided on the circumference of the coarse separating drum. The diameter of the coarse separating drum matches the diameter of the coarse separating space, and the volume of the coarse separating groove is larger than the volume of the subdividing groove.

6. The automatic weighing device for microgram powder according to claim 1, characterized in that: A second subdivision mesh drive motor is provided on the outer side of the lower housing. A flange is fixed on the output shaft of the second subdivision mesh drive motor. A ball joint connecting rod is provided between the flange and the second subdivision mesh. One end of the ball joint connecting rod is hinged to the non-center position of the flange, and the other end is hinged to one side of the second subdivision mesh.

7. The automatic weighing device for microgram powder according to claim 1, characterized in that: The gripping robot is connected to a gripping drive structure. The gripping robot is mounted on a rotating lifting platform. The rotating lifting platform is equipped with a drive mechanism that drives the rotating lifting platform to rotate and lift.

8. The automatic weighing device for microgram powder according to claim 1, characterized in that: The third drive structure includes a tilting motor, an tilting cam fixed on the output shaft of the tilting motor, one end of the container hinged to the mounting plate, and the bottom of the container in contact with the tilting cam.

9. The automatic weighing device for microgram powder according to claim 4, characterized in that: A ball joint is also provided between the first driving structure and the slider and the sealing plate.

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