Stable magnetic powder quantitative automatic feeding device

Abstract

The utility model provides a stable and automatic quantitative magnetic powder feeding device, relates to a sewage treatment technology, and particularly discloses a rack, a hopper, an electric diaphragm pump and a stirring box, the hopper is mounted at the top of the rack, the diaphragm pump is mounted at the bottom of the rack, a discharging box is mounted at the bottom of the hopper, and the stirring box is mounted at the bottom of the hopper. A discharging structure used for stepped discharging is installed in the discharging box, a discharging port is formed in the side, away from the hopper, of the discharging box, a conveying pipeline communicated with an input port of the electric diaphragm pump is arranged at the discharging port, the stirring box is installed on the side wall of the rack, and the electric diaphragm pump is communicated with the bottom of the stirring box. A detection mechanism for monitoring leakage of the electric diaphragm pump is arranged in the electric diaphragm pump; the material guide opening is closed periodically, and the axial movement of the two-way spiral material pushing ring is matched, so that staged quantitative blanking is realized; the material pushing ring moves reversely to eliminate dead angles, and magnetic powder is prevented from being accumulated and agglomerated; and the magnetic powder is flatly laid into the discharging box and is matched with vibration of the vibrator to assist discharging, so that the discharging uniformity is remarkably improved, and the local blockage risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and more specifically, to a stable magnetic powder quantitative automatic dosing device. Background Technology

[0002] The magnetic media coagulation sedimentation process technology has been maturely applied to sewage treatment plant renovation, expansion, upgrading, and pollution reduction. This process requires the addition of magnetic powder as a system carrier in the coagulation stage to assist sewage treatment. Due to fluctuations in effluent and recycling, a very small amount of magnetic powder will be lost in the total effluent and residual sludge, so magnetic powder replenishment is necessary. In the entire process of magnetic powder dosing, continuous dosing via a screw conveyor is not feasible. The entire system operates intermittently, stopping the powder addition after each interval. This repeated dosing of powder within a short period of time causes the magnetic powder to easily clump during the dosing process. Even with the addition of a dehumidifier, the screw conveyor may still fail to discharge due to clumping. Inadequate sealing at the screw conveyor outlet allows moisture or morning dew to affect the discharge. Magnetic powder from different manufacturers may contain impurities, which can easily cause jamming at the screw conveyor, leading to blockage of the screw shaft within the mechanism and making maintenance difficult. Furthermore, after the pump stops during drug delivery, residual magnetic powder in the pump and pipeline can easily clog and damage the pump body. If the pump malfunctions and leaks, magnetic powder can easily enter the cavity. If this is not detected in time, it can wear down the bearings and crankshaft, increasing pump maintenance costs. Utility Model Content

[0003] The purpose of this invention is to provide a stable automatic magnetic powder metering device that addresses the shortcomings of existing technologies and solves the problems mentioned in the background section.

[0004] The technical solution of this utility model is implemented as follows:

[0005] This utility model provides a stable automatic magnetic powder metering device, including a frame, a hopper, an electric diaphragm pump, and a mixing tank. The hopper is installed on the top of the frame, and the diaphragm pump is installed on the bottom of the frame. A feeding box is installed at the bottom of the hopper, and a discharge structure for step-by-step feeding is installed inside the feeding box. A discharge port is opened on the side of the feeding box away from the hopper. A conveying pipe connected to the input port of the electric diaphragm pump is provided at the discharge port. The mixing tank is installed on the side wall of the frame, and the electric diaphragm pump is connected to the bottom of the mixing tank. A detection mechanism for monitoring leakage of the electric diaphragm pump is provided inside the electric diaphragm pump.

[0006] In some technical solutions of this utility model, a long strip-shaped feed inlet is provided on the side wall of the feeding box opposite to the hopper, and the feed inlet is connected to the discharge port of the hopper.

[0007] In some technical solutions of this utility model, an inner cylinder is rotatably provided inside the feeding box, and a guide port matching the feeding port is opened on the outer side wall of the inner cylinder. Two transmission shafts coaxial with the rotation center of the inner cylinder are rotatably provided on the side wall of the frame. The feeding box is displaced between the two transmission shafts. After the transmission shaft passes through the feeding box, it is connected to the outer wall of the inner cylinder located on the same side. A drive structure is provided on the frame that is connected to one of the transmission shafts.

[0008] In some technical solutions of this utility model, at least two pusher rings are installed in the annular space formed between the inner cylinder and the feeding box. Two spiral strips corresponding to the pusher rings are installed on the inner wall of the feeding box of the inner cylinder. The two spiral strips rotate in opposite directions. The outer wall of the pusher ring is provided with a groove adapted to the spiral strip. The outer wall of the inner cylinder is provided with two guide strips corresponding to the pusher rings. The guide strips are arranged along the axis of the inner cylinder. The inner wall of the pusher ring is provided with a guide groove adapted to the guide strip.

[0009] In some technical solutions of this utility model, a slag-blocking ring is installed on the outer side wall of the pusher ring, and a sealing rubber ring that abuts against the inner wall of the feed box is installed on the side wall of the slag-blocking ring.

[0010] In some technical solutions of this utility model, a stirring motor is installed on the top of the mixing tank, and a stirrer is installed on the output end of the stirring motor.

[0011] In some technical solutions of this utility model, the bottom of the two pump chambers of the electric diaphragm pump is provided with mounting holes, and each mounting hole is provided with an observation pipe connected to it. A pneumatic quick-connect tee is provided between the two through pipes. A detection pipe is provided at the bottom of the pneumatic quick-connect tee. A sensing electrode is provided at the output end of the detection pipe. An electrical control system is connected to the output end of the sensing electrode.

[0012] In some technical solutions of this utility model, a level gauge is provided at the bottom of the hopper.

[0013] In some technical solutions of this utility model, a vibrator is provided at the bottom of the hopper.

[0014] Compared with existing technologies, this utility model has at least the following advantages or beneficial effects: The inner cylinder rotates 180° periodically to open and close the feed inlet, combined with the axial movement of the bidirectional spiral pusher ring, achieving phased quantitative feeding. The reverse movement of the pusher ring eliminates dead angles, preventing magnetic powder accumulation and ensuring a constant single feeding amount; the elongated feed inlet and outlet structures expand the material contact area, allowing the magnetic powder to spread evenly into the feeding box. Combined with vibration-assisted feeding by a vibrator, this significantly improves feeding uniformity and reduces the risk of localized blockages; the combination of the slag-blocking ring and sealing rubber ring on the outer side of the pusher ring isolates magnetic powder from entering mechanical gaps, reducing component wear; the sealing end cap at the inner cylinder prevents side leakage and extends equipment life; the induction electrode detects leakage in the dual pump chambers of the diaphragm pump, the pneumatic quick-connect tee shortens the detection path, and the electrical control system triggers an alarm and shutdown, preventing media leakage and environmental pollution, and ensuring operational safety. Attached Figure Description

[0015] Figure 1 This is a front view of the present utility model.

[0016] Figure 2 This is a side view of the present invention.

[0017] Figure 3 This is a schematic diagram of the combined structure of the hopper and the feeding box in this utility model.

[0018] Figure 4 This is a cross-sectional view of the feeding box in this utility model.

[0019] Figure 5 This is an exploded structural diagram of the feed box and inner cylinder in this utility model.

[0020] Figure 6 This is a schematic diagram of the combined structure of the electric diaphragm pump and the observation pipe of this utility model.

[0021] Figure 7 This is a schematic diagram of the combined structure of the observation pipe and the detection pipe in this utility model.

[0022] Figure label:

[0023] 1. Frame; 2. Electrical control cabinet; 3. Hopper; 4. Hopper cover; 5. Eyepiece; 6. Vibrator; 7. Drive structure; 8. Agitator motor; 9. Ladder; 10. Electric diaphragm pump; 11. Sealing end cap; 12. Agitator; 13. Feed box; 14. Mixing tank; 15. High level gauge; 16. Low level gauge; 17. Material level gauge; 18. Drive shaft; 19. Inner cylinder; 20. Push ring; 21. Slag-blocking ring; 22. Sealing ring; 23. Guide strip; 24. Spiral strip; 25. Feed inlet; 26. Discharge outlet; 101. Observation pipe; 102. Pneumatic quick connector; 103. Detection pipe; 104. Induction electrode; 105. Electrical control system. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0026] Example

[0027] This invention provides a stable automatic magnetic powder metering device, such as... Figure 1 , Figure 2As shown, it includes a frame 1, a hopper 3, an electric diaphragm pump 10, and a mixing tank 14. The hopper 3 is bolted to the top of the frame 1. The hopper 3 is equipped with a hopper cover 4, which is used to close the hopper 3. The hopper 3 is equipped with an observation eyepiece 5, which is used to observe the amount of magnetic powder in the hopper. The lower part of the hopper 3 is tapered into a frustum shape. The diaphragm pump is bolted to the bottom of the frame 1. The bottom of the hopper 3 is equipped with a feeding box 13 that communicates with it. The feeding box 13 and the hopper 3 have a rectangular opening. The feeding box 13 is cylindrical and has a discharge structure for step feeding. The feeding box 13 has a rectangular discharge port 26 on the side away from the hopper 3. The discharge port 26 is equipped with a conveying pipe that communicates with the input port of the electric diaphragm pump 10. The mixing tank 14 is installed on the side wall of the frame 1. The bottom of the electric diaphragm pump 10 and the mixing tank 14 are connected by a pipe. The electric diaphragm pump 10 is equipped with a detection mechanism for monitoring leakage of the electric diaphragm pump 10. Magnetic powder is stored in hopper 3 and discharged in stages using the discharge structure in feeding box 13. The magnetic powder is then precisely delivered to mixing box 14 by electric diaphragm pump 10. The detection mechanism monitors the diaphragm pump for leakage in real time to ensure safe operation. Magnetic powder enters feeding box 13 from hopper 3. The discharge structure (such as rotating inner cylinder 19 or pusher ring 20) controls the discharge amount in stages. The magnetic powder enters the conveying pipeline through discharge port 26 and is pressurized by electric diaphragm pump 10 and delivered to the bottom of mixing box 14. The detection mechanism (such as induction electrode 104) monitors the sealing of diaphragm pump. If leakage occurs, the electronic control system 105 will alarm or stop the machine. Mixing box 14 receives and mixes magnetic powder through bottom connection port. The discharge structure and diaphragm pump work together to achieve staged quantitative addition. The detection mechanism monitors in real time to avoid magnetic powder leakage and environmental pollution. Frame 1 integrates hopper 3, pump body and mixing box 14 to reduce space occupation.

[0028] Preferably, a ladder 9 is also provided on the frame 1, which facilitates the operator to fill the hopper 3 with materials.

[0029] In some technical solutions of this utility model, a long strip-shaped feed inlet 25 is provided on the side wall of the feeding box 13 opposite to the hopper 3, and the feed inlet 25 is connected to the discharge outlet 26 of the hopper 3. By matching the long strip-shaped feed inlet 25 with the discharge outlet 26 of the hopper 3, the material contact area is expanded, ensuring uniform feeding. The discharge outlet 26 of the hopper 3 is directly aligned with the feed inlet 25 of the feeding box 13, and the magnetic powder is spread evenly into the feeding box 13 along the long strip-shaped channel, reducing local accumulation.

[0030] In some technical solutions of this utility model, an inner cylinder 19 is rotatably provided inside the feeding box 13. A guide port matching the feeding port 25 is opened on the outer side wall of the inner cylinder 19. Two transmission shafts 18 coaxial with the rotation center of the inner cylinder 19 are rotatably provided on the side wall of the frame 1. The feeding box 13 is displaced between the two transmission shafts 18. The transmission shaft 18 passes through the feeding box 13 and is connected to the outer wall of the inner cylinder 19 located on the same side. A drive structure 7 is provided on the frame 1 to be connected to one of the transmission shafts 18. The inner cylinder 19 is linked to the drive structure 7 via the transmission shaft 18. The periodic opening and closing of the guide port enables phased quantitative feeding. The drive structure 7 (such as a motor and reducer) drives the transmission shaft 18 to rotate, and the inner cylinder 19 rotates synchronously, so that the inner cylinder 19 reciprocates 180° to achieve opening and closing. The guide port of the inner cylinder 19 and the feed port 25 of the feeding box 13 are periodically aligned / misaligned to control the amount of magnetic powder passing through. The transmission shaft 18 passes through the feeding box 13 and is used to support the stable rotation of the inner cylinder 19. The rotation of the inner cylinder 19 enables intermittent feeding, which is convenient for accurate metering. The coaxial design of the two transmission shafts 18 reduces the eccentric vibration of the inner cylinder 19.

[0031] The inner cylinder 19 is located at both ends outside the feeding box 13 and is provided with sealing end caps 11 that abut against it.

[0032] In some technical solutions of this utility model, at least two pusher rings 20 are installed in the annular space formed between the inner cylinder 19 and the feeding box 13. Two spiral strips 24, each corresponding to one of the pusher rings 20, are installed on the inner wall of the feeding box 13 of the inner cylinder 19. The two spiral strips 24 rotate in opposite directions. The outer wall of the pusher ring 20 is provided with a groove adapted to the spiral strip 24. The outer wall of the inner cylinder 19 is provided with two guide strips 23, each corresponding to one of the pusher rings 20. The guide strips 23 are arranged along the axis of the inner cylinder 19. The inner wall of the pusher ring 20 is provided with a guide groove adapted to the guide strip 23. When the inner cylinder 19 rotates, the spiral strip 24 engages with the groove of the pusher ring 20, pushing the pusher ring 20 to move axially along the guide strip 23; the spiral strip 24 rotates in the opposite direction, causing the adjacent pusher rings 20 to move in the opposite direction, forming a bidirectional material push, thereby pushing the powder to the outlet 26. The guide groove restricts the pusher ring 20 to move only along the axis to avoid deviation. The bidirectional pusher ring 20 eliminates dead corners and prevents magnetic powder from agglomerating. The spiral motion of the pusher ring 20 scrapes the inner wall of the feed box 13, reducing powder residue.

[0033] In some technical solutions of this utility model, a slag-blocking ring 21 is installed on the outer wall of the pusher ring 20, and a sealing rubber ring 22 is installed on the side wall of the slag-blocking ring 21 to abut against the inner wall of the feeding box. When the pusher ring 20 moves, the slag-blocking ring 21 fits against the inner wall of the feeding box 13, and the sealing rubber ring 22 prevents fine particles from entering the annular gap. The combination of the slag-blocking ring 21 and the sealing rubber ring 22 seals the annular space, isolates impurities and reduces frictional wear. The double seal of the rubber ring and the slag-blocking ring 21 prevents magnetic powder from penetrating into the mechanical structure, reduces the wear of particles on the pusher ring 20 and the feeding box 13, and improves the service life of this structure.

[0034] In some technical solutions of this utility model, a stirring motor 8 is installed on the top of the mixing tank 14, and a stirrer 12 is installed on the output end of the stirring motor 8. The stirring motor 8 drives the stirrer 12 to rotate at high speed, so that the blades of the stirrer 12 form a vortex in the mixing tank 14, and the magnetic powder and the liquid come into full contact, thereby realizing the rapid mixing of the magnetic powder and the liquid.

[0035] In some technical solutions of this utility model, the bottom of each of the two pump chambers of the electric diaphragm pump is provided with an installation hole, and each of the two installation holes is provided with an observation pipe 101 connected to it, which is made of PE or other plastic material; a pneumatic quick-connect connector 102 is provided between the two through pipes, which is a tee connector; a detection pipe 103 is provided at the bottom of the pneumatic quick-connect connector 102 tee, the end of the detection pipe 103 is closed, and a sensing electrode 104 is provided at the output end of the detection pipe 103. The output end of the sensing electrode 104 is connected to an electronic control system 105, and the control system uses conventional technical means. If the diaphragm pump seal fails, liquid flows into the observation pipe 101 through the installation hole; the pneumatic quick-connect tee guides the leaked liquid to the detection pipe 103, triggering a signal from the sensing electrode 104; after receiving the signal, the electronic control system 105 alarms or stops the machine. The pneumatic quick-connect tee connects the observation pipe 101 and the detection pipe 103, and the sensing electrode 104 monitors the liquid leakage in the pump chamber. The pneumatic quick-connect structure shortens the leakage detection path and monitors both pump chambers simultaneously, improving reliability. The electronic control system is equipped with a signal amplifier and an audible and visual alarm. Upon receiving a signal, the electronic control system controls the electric diaphragm pump.

[0036] In some technical solutions of this utility model, a level gauge 17 is provided at the lower part of the hopper 3. The level gauge 17 (such as ultrasonic or capacitive type) detects the material height at the bottom of the hopper 3. When the material level is low, an alarm is triggered or automatic material replenishment is performed to ensure continuous feeding and reduce the frequency of manual inspection.

[0037] In some technical solutions of this utility model, a vibrator 6 is provided at the lower part of the hopper 3. The vibrator 6 (such as an electromagnetic type) is installed on the side wall of the hopper 3 and transmits energy through vibration waves to loosen the agglomerated magnetic powder and eliminate the adhesion of materials caused by static electricity or moisture; vibration assists in feeding, reduces the risk of blockage, and improves the flowability of powder.

[0038] Preferably, a high-level liquid level gauge 15 is provided at the upper part of the mixing tank 14, and a low-level liquid level gauge 16 is provided at the lower part of the mixing tank 14. Both the high-level liquid level gauge 15 and the low-level liquid level gauge 16 are simple liquid level gauges such as duckbill liquid level gauges.

[0039] Preferably, an electrical control cabinet 2 is also installed on the frame 1. The electrical control cabinet 2 is equipped with a control system. The control system uses conventional technology. The high-level liquid level gauge 15, the low-level liquid level gauge 16, the low-level liquid level gauge 16, the material level gauge 17, the stirring motor 8, the drive structure 7, and the electrical control system 105 are all electrically connected to the control system.

[0040] Before the equipment starts operating, a sufficient amount of magnetic powder to be used is first added to the hopper 3. The opening of the inner cylinder 19 is facing directly downwards by default. When the equipment needs to perform the feeding operation, clean water is automatically added from the water inlet pipe. When the liquid level reaches the high level, the water inlet is automatically closed. Then, the stirring motor 8 and the agitator 12 are turned on. The motor and the reducer drive the transmission shaft 18 together, causing the inner cylinder 19 to rotate upwards by 180°. At the same time, the pushing ring 20 between the inner and outer cylinders moves outwards to both sides. Then, the vibrator on the hopper 3 vibrates automatically twice. The magnetic powder rotates with the inner cylinder 19 and enters the inner cavity of the inner cylinder 19. After a few seconds, the inner cylinder 19 rotates downwards by 180° along the original path. The magnetic powder in the inner cavity of the inner cylinder 19 is transported to the electric diaphragm pump. At the same time, the rotation of the inner cylinder 19 causes the pushing ring 20 between the two cylinders to move inwards to both sides, assisting in squeezing the magnetic powder between the cylinders to fall off. Because the amount of magnetic powder added in a single batch is fixed, the number of reciprocating cycles required for adding magnetic powder to the inner cylinder 19 in each mixing tank 14 is set according to the total amount of magnetic powder to be added. Generally, the magnetic powder concentration in the tank does not exceed 30%. After the magnetic powder addition is completed, the electric diaphragm pump 10 is turned on to lift the prepared magnetic powder to the addition point. When more magnetic powder needs to be added, the process of each device above is repeated after the tank reaches the low liquid level.

[0041] When the addition is complete and the liquid level in the mixing tank 14 reaches a low level, open the water inlet pipe and add clean water into the tank. The pump continues to circulate and pump in clean water to flush the magnetic powder in the pump and pipes to prevent blockage. After a few minutes, shut down all equipment.

[0042] When either diaphragm on either side of the electric diaphragm pump 10 is damaged, water and impurities in the transmission medium enter the diaphragm and the pump chamber through the damaged point. Due to gravity, the water flows through the leak observation port, through the observation pipe (transparent pipe), and into the pneumatic quick-connect connector 102, where it collects at the sensing electrode 104, which is sealed with rubber or similar material. The sensing electrode 104 contains two sub-electrodes, positive and negative. When leaked water collects in the observation pipe (transparent pipe), the positive and negative electrodes become conductive, transmitting a signal to the signal amplifier in the electrical control cabinet 2. This signal further shuts down the pump and simultaneously activates the audible and visual alarm. After replacing the diaphragm, the system is manually restored to operation.

[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stable automatic magnetic powder metering device, characterized in that, The assembly includes a frame (1), a hopper (3), an electric diaphragm pump (10), and a mixing tank (14). The hopper (3) is installed on the top of the frame (1), and the electric diaphragm pump (10) is installed on the bottom of the frame (1). A discharge box (13) is installed at the bottom of the hopper (3). A discharge structure for step-by-step discharge is installed in the discharge box (13). A discharge port (26) is opened on the side of the discharge box (13) away from the hopper (3). A conveying pipe connected to the input port of the electric diaphragm pump (10) is provided at the discharge port (26). The mixing tank (14) is installed on the side wall of the frame (1). The electric diaphragm pump (10) is connected to the bottom of the mixing tank (14). A detection mechanism for monitoring leakage of the electric diaphragm pump (10) is provided in the electric diaphragm pump (10).

2. The stable magnetic powder metering automatic dosing device according to claim 1, characterized in that, The feeding box (13) has a long strip-shaped feeding port (25) on the side wall opposite to the hopper (3), and the feeding port (25) is connected to the discharge port (26) of the hopper (3).

3. The stable magnetic powder metering automatic dosing device according to claim 2, characterized in that, The feeding box (13) is rotatably provided with an inner cylinder (19). The outer side wall of the inner cylinder (19) is provided with a guide port that matches the feed port (25). The side wall of the frame (1) is provided with two drive shafts (18) that are coaxial with the rotation center of the inner cylinder (19). The feeding box (13) is displaced between the two drive shafts (18). The drive shaft (18) passes through the feeding box (13) and is connected to the outer wall of the inner cylinder (19) located on the same side. The frame (1) is provided with a drive structure (7) that is connected to one of the drive shafts (18).

4. The stable magnetic powder metering automatic dosing device according to claim 3, characterized in that, At least two pusher rings (20) are installed in the annular space formed between the inner cylinder (19) and the feeding box (13). Two spiral strips (24) corresponding to the pusher rings (20) are installed on the inner wall of the feeding box (13) of the inner cylinder (19). The two spiral strips (24) rotate in opposite directions. The outer wall of the pusher ring (20) is provided with a groove adapted to the spiral strip (24). The outer wall of the inner cylinder (19) is provided with two guide strips (23) corresponding to the pusher rings (20). The guide strips (23) are arranged along the axis of the inner cylinder (19). The inner wall of the pusher ring (20) is provided with a guide groove adapted to the guide strip (23).

5. The stable magnetic powder quantitative automatic dosing device according to claim 4, characterized in that, A slag-blocking ring (21) is installed on the outer side wall of the pusher ring (20), and a sealing rubber ring (22) that abuts against the inner wall of the feed box (13) is installed on the side wall of the slag-blocking ring (21).

6. The stable magnetic powder metering automatic dosing device according to claim 2, characterized in that, A stirring motor (8) is installed on the top of the mixing tank (14), and a stirrer (12) is installed on the output end of the stirring motor (8).

7. The stable magnetic powder metering automatic dosing device according to claim 1, characterized in that, The electric diaphragm pump (10) has mounting holes at the bottom of its two pump chambers. Each mounting hole has an observation pipe (101) connected to it. A pneumatic quick-connect fitting (102) tee is provided between the two through pipes. A detection pipe (103) is provided at the bottom of the pneumatic quick-connect fitting (102) tee. A sensing electrode (104) is provided at the output end of the detection pipe (103). An electronic control system (105) is connected to the output end of the sensing electrode (104).

8. The stable magnetic powder metering automatic dosing device according to claim 1, characterized in that, The lower part of the hopper (3) is equipped with a level gauge (17).

9. The stable magnetic powder metering automatic dosing device according to claim 1, characterized in that, The lower part of the hopper (3) is provided with a vibrator (6).

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