Multi-powder automatic weighing and proportioning device

Abstract

The utility model belongs to powder material proportioning technical field, concretely speaking it is a kind of many powder material automatic weighing proportioning device, including multiple inlet box, the inlet box side wall middle part is connected with transport case, the inside wall middle part of inlet box is equipped with weighing assembly, can directly control single powder material dosage by setting up first motor, weighing disc, weight sensor and limit slot, accurately realize the addition of small proportion powder material, reduce its being main material cover and leak or mistake, reduce lightweight powder material in common weighing simultaneously because of dust raising and lead to actual weight deficiency, or the proportion imbalance caused by heavy powder material deposition, by setting up scraping plate, elastic cord and lock ring, can reduce the proportion deviation caused by powder material adsorption, residue when mixing and weighing, to cause actual input quantity deficiency, scraping plate can effectively clean the attached powder material on weight sensor, make every one portion of well weighed powder material accurately enter mixing cylinder, maintain the consistency of formula proportion.

Description

Technical Field

[0001] This utility model belongs to the field of powder proportioning technology, specifically an automatic weighing and proportioning device for multiple powders. Background Technology

[0002] Powder refers to solid materials that have been processed through grinding, crushing, sieving and other processes and have become loose powder. Its core characteristics are small particle size and varying flowability (or viscosity). It is widely used in many fields such as industry, food, and medicine.

[0003] In existing technologies, different powders play different roles in the formulation. Mixing them in proportion can make each function work synergistically. If the proportion of a certain functional powder is too high or too low, it will affect the efficacy of the product.

[0004] Through long-term use and observation, it was found that during the process of mixing various powders in the prescribed proportions, powder residue on the weighing pan caused the actual proportion of powders involved in the mixing to deviate from the preset formula, thus resulting in substandard product performance.

[0005] Therefore, this utility model provides an automatic weighing and proportioning device for multiple powders. Utility Model Content

[0006] To overcome the shortcomings of existing technologies and solve the problem of inaccurate proportioning caused by powder residue on the weighing pan as mentioned in the background technology, an automatic weighing and proportioning device for multiple powders is proposed.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: The multi-powder automatic weighing and proportioning device of this utility model includes multiple feeding boxes. A transport box is connected to the middle of the side wall of each feeding box. A weighing component is provided in the middle of the inner side wall of each feeding box, which can weigh the poured powder. A transport component is provided in the middle of the inner side wall of each transport box, which can transport the powder inside the transport box to a designated outlet. A discharge cylinder is connected to the middle of the side wall of each transport box. A mixing cylinder is connected to the bottom of the discharge cylinder. A mixing component is provided in the middle of the inner side wall of the mixing cylinder, which can mix multiple powders. A cylinder cover is installed on the top of the mixing cylinder, and a discharge component is provided at the bottom of the mixing cylinder. The weighing component includes a first motor, which is mounted on the side wall of the feeding box. A weighing pan is rotatably connected to the output end of the first motor, and a [missing information - likely a device or component] is mounted on the top of the weighing pan. The weight sensor has limit grooves on both sides of the feed box. A scraper is slidably connected to the middle of the inner wall of the limit groove. Multiple elastic ropes are fixed to the middle of the side wall of the scraper. A locking ring is sleeved on the middle of the side wall of the elastic rope. The locking ring is made of elastic material. This step can directly control the amount of a single powder by setting up a first motor, weighing pan, weight sensor and limit groove, accurately realize the addition of small proportions of powder, reduce the omission or incorrect addition of powder due to being covered by the main material, and at the same time reduce the actual weight of light powder due to dust during joint weighing, or the proportion imbalance caused by the sedimentation of heavy powder. By setting up scraper, elastic rope and locking ring, the proportion deviation caused by powder adsorption and residue during mixing and weighing can be reduced, so as to reduce the actual input amount. The scraper can effectively clean the powder adhering on the weight sensor, so that each weighed powder enters the mixing drum accurately and maintains the consistency of the formula ratio.

[0008] Preferably, the mixing assembly includes a second motor mounted on the top of the cylinder cover. The output end of the second motor is fixedly connected to multiple first movable shafts. A third motor is fixedly connected to the middle of the sidewall of each of the first movable shafts. The output end of the third motor is fixedly connected to a second movable shaft. The second movable shaft and the first movable shaft are rotatably connected. A synchronous belt is driven through the middle of the sidewall of the second movable shaft. Multiple first stirring rods are driven through the middle of the inner sidewall of the synchronous belt. The first stirring rods are rotatably connected to the first movable shaft. Multiple second stirring rods are fixed to the middle of the sidewall of each first stirring rod. All stirring rods are located inside the mixing drum. This step involves setting up a second motor, a first movable shaft, a third motor, a second movable shaft, a synchronous belt, a first stirring rod, and a second stirring rod. This allows the first stirring rod to both revolve around the mixing drum and rotate on its own axis to stir the powder. The revolving motion drives the first stirring rod to rotate around the center of the mixing drum, which can quickly agitate all the powder in the mixing drum, forming a macroscopic powder circulation. The rotational motion allows the first stirring rod to rotate at high speed, generating a strong shearing and dispersing effect on the surrounding local powder, quickly breaking up powder agglomerates, significantly improving mixing efficiency, and shortening the mixing time.

[0009] Preferably, the discharge assembly includes a pair of movable discharge plates slidably connected to the bottom of the mixing cylinder. A limit block is fixed to the top of the movable discharge plate, and a handle is fixed to the middle of the side wall of the movable discharge plate. A guide cylinder is installed at the bottom of the mixing cylinder, and the guide cylinder has an inverted conical structure. This step, by setting the movable discharge plate, the limit block, and the handle, allows the discharge speed to be adjusted by sliding or opening and closing, preventing a large amount of mixed powder from flowing out at once, reducing accumulation and clumping in the receiving container. The guide cylinder with an inverted conical structure can gather the dispersed powder to the discharge port, reducing powder spillage during transfer, reducing waste and on-site cleaning workload.

[0010] Preferably, the transport component includes a fourth motor, which is mounted on the side wall of the feed box. The output end of the fourth motor is fixedly connected to a third movable shaft. An auger disc is installed in the middle of the side wall of the third movable shaft and is located inside the transport box. This step, by setting up the fourth motor, the third movable shaft and the auger disc, ensures that the powder does not come into direct contact with the outside air during the transport process, effectively preventing dust from being generated during the transfer, realizing closed transport and reducing dust and pollution.

[0011] Preferably, a plurality of mixing scrapers are fixed in the middle of the side wall of the first movable shaft. The mixing scrapers are located inside the mixing cylinder. This step allows the mixing scrapers to rotate close to the bottom of the mixing cylinder and directly scrape the powder deposited at the bottom of the cylinder, reducing the problem of long-term accumulation without participating in mixing, which would lead to the final material being "uniform at the top but uneven at the bottom".

[0012] Preferably, a dustproof cloth is fixed between the limiting groove and the scraper. The dustproof cloth is made of elastic material and is placed outside the limiting groove. This step, by placing a dustproof cloth outside the limiting groove, can form a physical barrier to prevent powder from falling into the limiting groove and ensure the quality of products produced in subsequent production.

[0013] The beneficial effects of this utility model are as follows: 1. The multi-powder automatic weighing and proportioning device of this utility model can directly control the amount of a single powder by setting a first motor, weighing pan, weight sensor and limit groove, accurately realize the addition of small proportion of powder, reduce the omission or incorrect addition caused by the main material, and at the same time reduce the actual weight of light powder due to dust when weighing together, or the proportion imbalance caused by the sedimentation of heavy powder. By setting scraper, elastic rope and locking ring, the proportion deviation caused by powder adsorption and residue during mixing and weighing can be reduced, thereby reducing the actual input amount. The scraper can effectively clean the powder adhering on the weight sensor, so that each weighed powder enters the mixing drum accurately and maintains the consistency of the formula ratio.

[0014] 2. The automatic weighing and proportioning device for multiple powders described in this utility model, by setting a second motor, a first movable shaft, a third motor, a second movable shaft, a synchronous belt, a first stirring rod, and a second stirring rod, enables the first stirring rod to both revolve and rotate within the mixing drum to stir the powder. The revolving motion drives the first stirring rod to rotate around the center of the mixing drum, which can quickly agitate all the powders within the mixing drum, forming a macroscopic powder circulation. The rotational motion allows the first stirring rod to rotate at high speed, generating a strong shearing and dispersing effect on the surrounding local powders, quickly breaking up powder agglomerates, significantly improving mixing efficiency, and shortening the proportioning time. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the mixing cylinder in this utility model; Figure 3 This is a schematic diagram of the cooperative structure of the movable shaft and the mixing scraper in this utility model; Figure 4 This is a schematic diagram of the cooperative structure of the movable discharge plate and the mixing cylinder in this utility model; Figure 5 This is a schematic diagram of the cooperative structure of the feed box and the weighing pan in this utility model.

[0017] Legend: 1. Feed box; 11. Transport box; 12. Discharge cylinder; 13. Mixing cylinder; 14. Cylinder cover; 2. First motor; 21. Weighing pan; 22. Weight sensor; 23. Limiting groove; 24. Scraper; 25. Elastic rope; 26. Locking ring; 3. Second motor; 31. First movable shaft; 32. Third motor; 33. Second movable shaft; 34. Synchronous belt; 35. First stirring rod; 36. Second stirring rod; 4. Movable discharge plate; 41. Limiting block; 42. Handle; 43. Guide cylinder; 5. Fourth motor; 51. Third movable shaft; 52. Screwdriver disc; 6. Mixing scraper; 7. Dustproof cloth. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Specific implementation examples are given below.

[0020] like Figures 1 to 5 As shown in the figure, an automatic weighing and proportioning device for multiple powders according to an embodiment of the present invention includes multiple feeding boxes 1. A transport box 11 is connected to the middle of the side wall of the feeding box 1. A weighing component is provided in the middle of the inner side wall of the feeding box 1, which can weigh the poured powder. A transport component is provided in the middle of the inner side wall of the transport box 11, which can transport the powder inside the transport box 11 to a designated outlet. A discharge cylinder 12 is connected to the middle of the side wall of the transport box 11. A mixing cylinder 13 is connected to the bottom of the discharge cylinder 12. A mixing component is provided in the middle of the inner side wall of the mixing cylinder 13, which can mix multiple powders. A cylinder cover 14 is installed on the top of the mixing cylinder 13. The bottom of the mixing cylinder 13 is equipped with a discharge component. The staff pours the various powders to be mixed into the corresponding feed box 1. At this time, the weighing component inside the feed box 1 will weigh the powder until the weight of the powder meets the mixing ratio. The powder is poured into the bottom of the feed box 1. At the same time, the transport component is activated to transport the powder to the discharge cylinder 12, so that it passes through the discharge cylinder 12 and enters the mixing cylinder 13. At this time, the various powders will gather inside the mixing cylinder 13. The staff starts the mixing component, which will stir and mix the various powders to make them evenly mixed together. After the mixing is completed, the discharge component is pulled, and the mixed powder will flow out through the discharge component.

[0021] like Figure 1 , Figure 2 and Figure 5As shown, the weighing assembly includes a first motor 2, which is mounted on the side wall of the feed box 1. The output end of the first motor 2 is rotatably connected to a weighing pan 21. A weight sensor 22 is mounted on the top of the weighing pan 21. Limiting grooves 23 are provided on both sides of the feed box 1. A scraper 24 is slidably connected to the middle of the inner side wall of the limiting groove 23. Multiple elastic ropes 25 are fixed to the middle of the side wall of the scraper 24. A locking ring 26 is sleeved on the middle of the side wall of the elastic ropes 25. The locking ring 26 is made of elastic material. When the operator pours various powders onto the top of the weight sensor 22, the weight sensor 22 weighs the powders. When the weight reaches the specified ratio, the first motor 2 is activated, and the locking ring 26 releases the limiting force on the elastic ropes 25. At this time, the first motor 2 rotates the weighing pan 21. The rotation of the weighing pan 21 causes the weight sensor 22 to move simultaneously, so that the powder on the top of the weight sensor 22 moves onto the scraper 24. The powder is poured into the feed hopper 1 under the push of 4. After all the powder has entered, the weight sensor 22 is returned to its original position, and multiple elastic ropes 25 are pulled to make the scraper 24 return to its original position. This step can directly control the amount of a single powder by setting the first motor 2, weighing pan 21, weight sensor 22 and limit groove 23, accurately realize the addition of small proportions of powder, reduce the omission or wrong addition caused by the main material, and at the same time reduce the actual weight of light powder due to dust when weighing together, or the proportion imbalance caused by the sedimentation of heavy powder. By setting the scraper 24, elastic ropes 25 and locking ring 26, the proportion deviation caused by powder adsorption and residue during mixing and weighing can be reduced, thus reducing the actual input amount. The scraper 24 can effectively clean the powder adhering to the weight sensor 22, so that each weighed powder enters the mixing drum 13 accurately and maintains the consistency of the formula ratio.

[0022] like Figures 1 to 4As shown, the mixing assembly includes a second motor 3, which is mounted on the top of the cylinder cover 14. Multiple first movable shafts 31 are fixedly connected to the output end of the second motor 3. A third motor 32 is fixedly connected to the middle of the side wall of the first movable shaft 31. A second movable shaft 33 is fixedly connected to the output end of the third motor 32. The second movable shaft 33 and the first movable shaft 31 are rotatably connected. A synchronous belt 34 is driven through the middle of the side wall of the second movable shaft 33. Multiple first stirring rods 35 are driven through the middle of the inner side wall of the synchronous belt 34. The first stirring rods 35 and the first movable shaft 31 are rotatably connected. Multiple second stirring rods 36 are fixed to the middle of the side wall of the first stirring rods 35. Both the first stirring rods 35 and the second stirring rods 36 are located inside the mixing cylinder 13. When the operator starts the second motor 3 and the third motor 32, the second motor 3 drives the first movable shaft 31 to rotate. When the first movable shaft 31 rotates, it drives the multiple first stirring rods 35 and the second stirring rods 36 to rotate inside the mixing cylinder 13. The third motor 32 drives the second movable shaft 33 to rotate. When motor 33 rotates, it drives the synchronous belt 34 to rotate, which in turn drives multiple first stirring rods 35 to rotate. At this time, the first stirring rods 35 rotate on the side wall of the first movable shaft 31. The first stirring rods 35 rotate and revolve inside the mixing drum 13. Multiple first stirring rods 35 and second stirring rods 36 mix various powders inside the mixing drum 13. This step, by setting up the second motor 3, the first movable shaft 31, the third motor 32, the second movable shaft 33, the synchronous belt 34, the first stirring rods 35 and the second stirring rods 36, allows the first stirring rods 35 to both revolve and rotate to stir the powder inside the mixing drum 13. The revolve motion drives the first stirring rods 35 to rotate around the center of the mixing drum 13, which can quickly turn over all the powders inside the mixing drum 13, forming a macroscopic powder circulation. The rotation motion allows the first stirring rods 35 to rotate at high speed, generating a strong shearing and dispersing effect on the surrounding local powders, quickly breaking up powder agglomerates, greatly improving mixing efficiency, and shortening the mixing time.

[0023] like Figures 1 to 4 As shown, the discharge assembly includes a pair of movable discharge plates 4, which are slidably connected to the bottom of the mixing cylinder 13. A limit block 41 is fixed to the top of the movable discharge plate 4, and a handle 42 is fixed to the middle of the side wall of the movable discharge plate 4. A guide cylinder 43 is installed at the bottom of the mixing cylinder 13. The guide cylinder 43 has an inverted conical structure. After the various powders are mixed, the operator holds the handles 42 on both sides and pulls the movable discharge plate 4 outward, so that the powder enters the guide cylinder 43 from the inside of the mixing cylinder 13 and flows outward from the guide cylinder 43. This step can adjust the discharge speed by sliding or opening and closing the movable discharge plate 4, the limit block 41, and the handle 42 to prevent the mixed powder from rushing out in a large amount at once, and reduce the accumulation and clumping in the receiving container. The guide cylinder 43 with an inverted conical structure can gather the dispersed powder to the discharge port, reduce the powder from spilling outside during the transfer process, and reduce waste and on-site cleaning workload.

[0024] like Figure 1 , Figure 2 and Figure 5 As shown, the transport assembly includes a fourth motor 5, which is mounted on the side wall of the feed box 1. A third movable shaft 51 is fixedly connected to the output end of the fourth motor 5. An auger disc 52 is installed in the middle of the side wall of the third movable shaft 51. The auger disc 52 is located inside the transport box 11. When the operator starts the fourth motor 5, the fourth motor 5 will drive the third movable shaft 51 to rotate. When the third movable shaft 51 rotates, it will drive the auger disc 52 to rotate inside the transport box 11. When the auger disc 52 rotates, it will push the powder towards the discharge cylinder 12. This step, by setting the fourth motor 5, the third movable shaft 51 and the auger disc 52, can prevent the powder from directly contacting the outside air during the transport process, effectively preventing dust from being generated during the transfer, realizing closed transport, and reducing dust and pollution.

[0025] like Figure 2 and Figure 3 As shown, multiple mixing scrapers 6 are fixed in the middle of the side wall of the first movable shaft 31. The mixing scrapers 6 are located inside the mixing cylinder 13. When the first movable shaft 31 rotates, it will drive the multiple mixing scrapers 6 to rotate simultaneously inside the mixing cylinder 13. At this time, the mixing scrapers 6 will mix the powder that has settled at the bottom of the mixing cylinder 13. This step is achieved by setting the mixing scrapers 6 to rotate close to the bottom of the mixing cylinder 13, directly scraping the powder deposited at the bottom of the cylinder, reducing the long-term accumulation of the powder that does not participate in the mixing, which would lead to the problem of "uniform at the top and uneven at the bottom" in the final material.

[0026] like Figure 2 As shown, a dustproof cloth 7 is fixed between the limiting groove 23 and the scraper 24. The dustproof cloth 7 is made of elastic material and is placed outside the limiting groove 23. This step can form a physical barrier by placing the dustproof cloth 7 outside the limiting groove 23 to prevent powder from falling into the limiting groove 23 and ensure the quality of products produced in subsequent production.

[0027] Working principle: The operator pours the various powders to be mixed into their respective feed hoppers 1. The weighing component inside feed hopper 1 weighs the powders until the weight matches the mixing ratio. The powders are then poured to the bottom of feed hopper 1. Simultaneously, the transport component is activated, transporting the powders to the discharge cylinder 12, through which they enter the mixing cylinder 13. The various powders then converge inside the mixing cylinder 13. The operator activates the mixing component, which stirs and mixes the powders evenly. Once mixing is complete, the discharge component is pulled, and the mixed powders flow out through it. Workers pour various powders onto the top of the weight sensor 22. The weight sensor 22 weighs the powders. When the weight reaches the specified ratio, the first motor 2 is activated and the locking ring 26 releases the limit on the elastic rope 25. The first motor 2 then rotates the weighing pan 21. As the weighing pan 21 rotates, it moves the weight sensor 22, causing the powder on top of the weight sensor 22 to be pushed into the feed hopper 1 by the scraper 24. After all the powder has entered, the weight sensor 22 is returned to its original position, and the multiple elastic ropes 25 are pulled, causing the scraper 24 to return to its original position. Workers then activate the second motor 3 and the third motor 4. 2. The second motor 3 drives the first movable shaft 31 to rotate. When the first movable shaft 31 rotates, it drives multiple first stirring rods 35 and second stirring rods 36 to rotate inside the mixing drum 13. The third motor 32 drives the second movable shaft 33 to rotate. When the second movable shaft 33 rotates, it drives the synchronous belt 34 to rotate. When the synchronous belt 34 rotates, it drives multiple first stirring rods 35 to rotate. At this time, the first stirring rods 35 rotate on the side wall of the first movable shaft 31. At this time, the first stirring rods 35 rotate on their own axis and revolve around the center inside the mixing drum 13. Multiple first stirring rods 35 and second stirring rods 36 mix various powders inside the mixing drum 13. When multiple powders... After mixing, the operator holds the handles 42 on both sides and pulls the movable discharge plate 4 outward, so that the powder enters the guide cylinder 43 from the inside of the mixing cylinder 13 and flows outward from the guide cylinder 43. The operator starts the fourth motor 5, which drives the third movable shaft 51 to rotate. When the third movable shaft 51 rotates, it drives the auger disc 52 to rotate inside the transport box 11. When the auger disc 52 rotates, it pushes the powder towards the discharge cylinder 12. When the first movable shaft 31 rotates, it drives multiple mixing scrapers 6 to rotate simultaneously inside the mixing cylinder 13. At this time, the mixing scrapers 6 will mix the powder that has settled at the bottom of the mixing cylinder 13.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic weighing and proportioning device for multiple powders, comprising multiple feeding bins (1), characterized in that: The feed box (1) is connected to the middle of the side wall of the feed box (1). The middle of the inner side wall of the feed box (1) is provided with a weighing component, which can weigh the poured powder. The middle of the inner side wall of the feed box (11) is provided with a transport component, which can transport the powder inside the transport box (11) to the designated outlet. The middle of the side wall of the feed box (11) is connected with a discharge cylinder (12). The bottom of the discharge cylinder (12) is connected with a mixing cylinder (13). The middle of the inner side wall of the mixing cylinder (13) is provided with a mixing component, which can mix multiple powders. The top of the mixing cylinder (13) is equipped with a cylinder cover (14), and the bottom of the mixing cylinder (13) is provided with a discharge component.

2. The automatic weighing and proportioning device for multiple powders according to claim 1, characterized in that: The weighing assembly includes a first motor (2), which is mounted on the side wall of the feed box (1). The output end of the first motor (2) is rotatably connected to a weighing pan (21). A weight sensor (22) is mounted on the top of the weighing pan (21). Limiting grooves (23) are opened on both sides of the feed box (1). A scraper (24) is slidably connected to the middle of the inner side wall of the limiting groove (23). Multiple elastic ropes (25) are fixed in the middle of the side wall of the scraper (24). A locking ring (26) is sleeved in the middle of the side wall of the elastic rope (25). The locking ring (26) is made of elastic material.

3. The automatic weighing and proportioning device for multiple powders according to claim 1, characterized in that: The mixing assembly includes a second motor (3), which is mounted on the top of the cylinder cover (14). The output end of the second motor (3) is fixedly connected to a plurality of first movable shafts (31). A third motor (32) is fixedly connected to the middle of the side wall of the first movable shaft (31). The output end of the third motor (32) is fixedly connected to a second movable shaft (33). The second movable shaft (33) and the first movable shaft (31) are rotatably connected. A synchronous belt (34) is driven to the middle of the side wall of the second movable shaft (33). A plurality of first stirring rods (35) are driven to the middle of the inner side wall of the synchronous belt (34). The first stirring rods (35) and the first movable shaft (31) are rotatably connected. A plurality of second stirring rods (36) are fixed to the middle of the side wall of the first stirring rods (35). The first stirring rods (35) and the second stirring rods (36) are both located inside the mixing cylinder (13).

4. The automatic weighing and proportioning device for multiple powders according to claim 1, characterized in that: The discharge assembly includes a pair of movable discharge plates (4), which are slidably connected to the bottom of the mixing cylinder (13). A limit block (41) is fixed on the top of the movable discharge plate (4), and a handle (42) is fixed in the middle of the side wall of the movable discharge plate (4). A guide cylinder (43) is installed at the bottom of the mixing cylinder (13), and the guide cylinder (43) is set with an inverted conical structure.

5. The automatic weighing and proportioning device for multiple powders according to claim 1, characterized in that: The transport component includes a fourth motor (5), which is mounted on the side wall of the feed box (1). The output end of the fourth motor (5) is fixedly connected to a third movable shaft (51). An auger disc (52) is installed in the middle of the side wall of the third movable shaft (51). The auger disc (52) is located inside the transport box (11).

6. The automatic weighing and proportioning device for multiple powders according to claim 3, characterized in that: Multiple mixing scrapers (6) are fixed in the middle of the side wall of the first movable shaft (31), and the mixing scrapers (6) are located inside the mixing cylinder (13).

7. The automatic weighing and proportioning device for multiple powders according to claim 2, characterized in that: A dustproof cloth (7) is fixed between the limiting groove (23) and the scraper (24). The dustproof cloth (7) is made of elastic material and is placed over the limiting groove (23).

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