Spiral powder quantitative feeding equipment

Abstract

The invention relates to the technical field of feeder design, in particular to spiral quantitative powder feeding equipment which comprises a conveying pipe, a first driving motor is fixedly mounted on the right side of the conveying pipe, a conveying auger is driven by the output end of the first driving motor, and the output end of the conveying pipe is connected with a discharging device through a middle pipe. The discharging device comprises a spherical shell, the upper end of the spherical shell is in butt joint with the middle pipe through a feeding port, the lower end of the spherical shell is in butt joint with external equipment through a discharging port, a rotating ball is driven in the spherical shell, a transferring cylinder is arranged in the rotating ball, and a second piston plate is arranged in the transferring cylinder. And a second push rod is fixedly mounted in the transfer ball. Quantitative transfer of powder is achieved through the transfer barrel, gas in external equipment is prevented from directly entering the conveying pipe, the transfer barrel can effectively reduce the effective powder adhesion area, and therefore the feeding precision problem caused by powder adhesion is avoided.

Description

Technical Field

[0001] This invention relates to the field of feeder design technology, specifically to a spiral powder quantitative feeding device. Background Technology

[0002] A screw feeder, also known as a screw conveyor, is a device that uses an internal conveying auger to quantitatively transport materials into the equipment. It is especially suitable for the continuous conveying and batching of powder materials.

[0003] The invention disclosed in CN110712959A provides a spiral stirring powder feeder capable of mixing various powders. However, the following problems affecting the practicality of this equipment during its use in the chemical industry arise:

[0004] 1. Firstly, the discharge pipe is directly connected to external chemical equipment. When the chemical equipment is working, the airflow generated will wash the powder in the discharge pipe down, thus affecting the raw material ratio.

[0005] 2. During the feeding process, airflow, especially water vapor, in the chemical equipment can easily enter the feeder, causing the powder inside the feeder to clump and adhere to the inner wall of the feeder. This adhered material not only affects the accuracy of the feeder's direct feeding, but may also cause changes in the ratio due to accidental falling into the chemical equipment. Furthermore, for mixtures containing multiple powders, the stronger adhesion to only some powder components may lead to further imbalance in the ratio.

[0006] 3. The equipment lacks a mechanism to directly clean the powder adhering to the inside of the equipment, resulting in frequent manual maintenance during use.

[0007] Therefore, it is difficult to meet the existing needs of precision chemical production. In view of this, this application provides a spiral powder quantitative feeding device. Summary of the Invention

[0008] The purpose of this invention is to provide a spiral powder metering feeding device to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a spiral powder quantitative feeding device, comprising a conveying pipe, a first drive motor fixedly installed on the right side of the conveying pipe, and an auger inserted into the conveying pipe at the output end of the first drive motor. Material is fed to the auger through a feed hopper on the conveying pipe. A mixing device for mixing the powder is provided inside the feed hopper. The mixing device includes a stirring motor fixed inside the feed hopper, and a spiral blade for mixing the powder is coaxially driven by a stirring paddle at the output end of the stirring motor. A discharge device is connected to the output end of the conveying pipe through an intermediate pipe, and the discharge device includes a spherical shell. The upper end of the spherical shell is connected to the intermediate pipe through a feed inlet, and the lower end of the spherical shell is connected to external equipment through a discharge outlet. A rotating ball is driven inside the spherical shell by a second drive motor, and a transfer cylinder for transferring the powder is provided inside the rotating ball. A second piston plate is provided inside the transfer cylinder, and a second push rod for driving the second piston plate to slide along the transfer cylinder is fixedly installed inside the transfer ball.

[0010] Optionally, the stirring motor, the first drive motor, and the second drive motor are all stepper motors, and the second push rod is an electric push rod. A controller is fixedly installed on the conveying pipe, and the controller is electrically connected to the stirring motor, the first drive motor, the second drive motor, and the second push rod, respectively.

[0011] Optionally, the stirring paddle is provided with stirring blades for stirring and mixing powder on the outer side of the corresponding spiral blades, and a scraper for scraping powder located on the inner wall of the feed hopper is fixedly installed at the end of the stirring paddle.

[0012] Optionally, a second cleaning motor is fixedly installed inside the second piston plate, and the output end of the second cleaning motor drives an elastic brush for cleaning the surface of the second piston plate and the inner wall of the transfer cylinder. The second cleaning motor is electrically connected to the controller.

[0013] Optionally, the discharge port is integrally formed with a locking protrusion for locking the end of the elastic brush and causing the elastic brush to deform and then pop out, and the elastic brush is made of plastic or metal spring.

[0014] Optionally, the intermediate tube is connected to an inner tube via a flexible connecting ring, and the inner tube is used to connect to the conveying pipe and the feed inlet. The intermediate tube is equipped with a vibration device for striking the inner tube, and the vibration device includes a connecting housing fixed on the intermediate tube. An auxiliary magnet is connected to the connecting housing via a first return spring. An impact head for striking the inner tube is fixedly installed at the bottom of the auxiliary magnet. An electromagnet for driving the movement of the auxiliary magnet is provided at one end of the corresponding transfer cylinder inside the rotating ball. The electromagnet is electrically connected to the controller.

[0015] Optionally, the flexible connecting ring is a rubber ring, and a second return spring is provided between the inner tube and the intermediate tube to maintain the position of the inner tube.

[0016] Optionally, a cleaning fitting tube is fixedly installed on the left side of the spherical shell, and the lower end of the cleaning fitting tube is connected to a waste discharge pipe for discharging waste. A first push rod is fixedly installed at the end of the cleaning fitting tube, and the output end of the first push rod drives a first piston plate that slides along the inner cavity of the cleaning fitting tube. A first cleaning motor is fixedly installed on the first piston plate, and the output end of the first cleaning motor drives a cleaning brush for cleaning the surface of the second piston plate and the inner wall of the transfer cylinder. The first push rod and the first cleaning motor are electrically connected to the controller.

[0017] Optionally, a jet head for spraying air into the transfer cylinder is fixedly installed on the first piston plate, and an air intake pump is fixedly installed on the spherical shell. The outlet end of the air intake pump is connected to the jet head through a connecting hose, and the air intake pump is electrically connected to the controller.

[0018] Optionally, the inner wall of the conveying pipe is provided with a spiral heat-insulating flow channel, and the left and right ends of the heat-insulating flow channel are respectively connected to the drain pipe and the inlet pipe, and the drain pipe and the inlet pipe are connected to an external heat-insulating liquid circulation supply device.

[0019] Compared with the prior art, the beneficial effects of the spiral powder metering feeding device provided by the present invention are:

[0020] 1. This invention isolates external equipment from the inside of the conveying pipe by rotating a ball, thereby preventing the powder inside the conveying pipe from being affected by the reaction inside the chemical equipment;

[0021] 2. This invention achieves quantitative transfer of powder through a transfer cylinder, avoiding the direct entry of gas from external equipment into the conveying pipe. Moreover, the transfer cylinder can effectively reduce the effective adhesion area of ​​the powder, thereby avoiding feeding accuracy problems caused by powder adhesion.

[0022] 3. The present invention provides an automatic cleaning device formed by a transfer cylinder, a vibration device, and a cleaning pipe, which can automatically clean powder adhering inside the equipment, thereby saving the cost of manual maintenance, enabling the equipment to be automatically maintained without stopping the machine, and improving the working efficiency of the equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a side view of the structure of the present invention;

[0025] Figure 3This is a cross-sectional view of the conveying pipe and mixing device of the present invention;

[0026] Figure 4 This is a cross-sectional view of the intermediate tube and vibration device of the present invention;

[0027] Figure 5 This is a cross-sectional view of the internal structure of the discharge device of the present invention;

[0028] Figure 6 This is a schematic diagram showing the connection between the intermediate pipe and the discharge device of the present invention.

[0029] In the diagram: 1. Conveying pipe; 2. Vibrating device; 201. Connecting shell; 202. Impact head; 203. First return spring; 204. Auxiliary magnet; 3. Discharging device; 301. Feed inlet; 302. Spherical shell; 303. Discharge port; 4. Second drive motor; 5. Feed hopper; 6. Mixing device; 601. Stirring motor; 602. Stirring paddle; 603. Spiral blade; 604. Stirring blade; 605. Scraper; 7. First drive motor; 8. Liquid inlet pipe; 9. Controller; 10. Second return spring; 11. Intermediate tube; 12. Flexible connecting ring; 13. Inner tube; 14. Drain pipe; 15. Air pump; 16. First push rod; 17. Waste discharge pipe; 18. Cleaning fitting pipe; 19. Second piston plate; 20. Insulated flow channel; 21. Conveying auger; 22. Locking protrusion; 23. Connecting hose; 24. Jet nozzle; 25. First cleaning motor; 26. First piston plate; 27. Cleaning brush; 28. Rotating ball; 29. ​​Second push rod; 30. Electromagnet; 31. Second cleaning motor; 32. Elastic brush plate; 33. Transfer cylinder. Detailed Implementation

[0030] To clearly and completely describe the objectives and technical solutions of this invention, and to more clearly illustrate its advantages, the embodiments of this invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this invention, and are merely used to explain the embodiments of this invention. They are not intended to limit the embodiments of this invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] Example 1: Please refer to Figures 1 to 3The present invention provides a spiral powder quantitative feeding device, including a conveying pipe 1, a controller 9 fixedly installed on the conveying pipe 1, a first drive motor 7 fixedly installed on the right side of the conveying pipe 1, and the output end of the first drive motor 7 drives a conveying auger 21 inserted into the conveying pipe 1. Powder is supplied to the conveying auger 21 through the feed hopper 5 on the conveying pipe 1, and then the first drive motor 7 drives the conveying auger 21 to rotate, thereby using the conveying auger 21 to convey the powder to the end of the conveying pipe 1. The feed hopper 5 is equipped with a mixing device 6 for mixing powders. The mixing device 6 is used to mix multiple powders. The mixing device 6 includes a stirring motor 601 fixed in the feed hopper 5. The output end of the stirring motor 601 drives a spiral blade 603 for mixing powders coaxially through a stirring paddle 602. The stirring paddle 602 is provided with stirring blades 604 for stirring and mixing powders on the outer side of the corresponding spiral blades 603. The end of the stirring paddle 602 is fixedly installed with a scraper 605 for scraping powders located on the inner wall of the feed hopper 5. When the stirring motor 601 rotates, the spiral blade 603 will rotate, thereby using its spiral structure to transport the powder at the bottom of the feed hopper 5 upward. During the transportation process, some powder will be thrown towards the stirring blade 604 under the action of centrifugal force, and thus be mixed by the stirring blade 604. The other part of the powder will be flipped to the top of the feed hopper 5, and thus mixed with the powder located above the feed hopper 5. Therefore, the spiral blade 603 can not only mix the powder at different depths in the feed hopper 5, but also accelerate the mixing of the powder by the stirring blade 604, thereby realizing the rapid mixing of powder by the mixing device 6. In order to improve the efficiency of the spiral blade 603 in transporting the powder upward, a guide sleeve can also be added inside the feed hopper 5 and fitted outside the spiral blade 603. Thus, the spiral blade 603 and the guide sleeve form a small auger conveying structure inside the feed hopper 5, which can stably transport the powder located below the feed hopper 5 back to the top of the feed hopper 5 to achieve mixing between the upper and lower layers of powder. Furthermore, the continuous scraping of the inner wall of the feed hopper 5 by the scraper 605 can also prevent powder from adhering to the inner wall of the feed hopper 5.

[0032] Please see Figures 1 to 6The output end of the conveying pipe 1 is connected to a discharge device 3 via an intermediate pipe 11. The discharge device 3 includes a spherical shell 302. The upper end of the spherical shell 302 is connected to the intermediate pipe 11 via a feed inlet 301, and the lower end of the spherical shell 302 is connected to external equipment via a discharge outlet 303. Inside the spherical shell 302, a rotating ball 28 is driven by a second drive motor 4. Inside the rotating ball 28, a transfer cylinder 33 for transferring powder is provided. Inside the transfer cylinder 33, a second piston plate 19 is provided, and inside the rotating ball 28, a device for driving the second piston plate 19 is fixedly installed. The piston plate 19 slides along the second push rod 29 of the transfer cylinder 33. The second cleaning motor 31 is fixedly installed inside the second piston plate 19. The output end of the second cleaning motor 31 drives an elastic brush 32 for cleaning the surface of the second piston plate 19 and the inner wall of the transfer cylinder 33. The second cleaning motor 31 is electrically connected to the controller 9. The discharge port 303 has an integrally formed locking protrusion 22 for locking the end of the elastic brush 32 and causing the elastic brush 32 to deform and then pop out. The elastic brush 32 is made of plastic or metal spring sheet. During normal operation, the conveying auger 21 delivers the required amount of powder into the intermediate tube 11. Simultaneously, the second push rod 29 pushes the second piston plate 19 to the inlet of the transfer cylinder 33, minimizing its effective volume. Then, driven by the second drive motor 4, the inlet of the transfer cylinder 33 aligns with the intermediate tube 11. Next, driven by the second push rod 29, the second piston plate 19 moves to the bottom of the transfer cylinder 33, maximizing its effective volume. At this point, the powder moves from the intermediate tube 11 into the transfer cylinder 33 under the combined influence of gravity and the suction generated by the increased volume. The second drive motor 4 then drives the cylinder to rotate again. The ball 28 moves, aligning the inlet of the transfer cylinder 33 with the discharge port 303. At this time, the second push rod 29 drives the second piston plate 19 to push the powder out of the transfer cylinder 33. This allows the powder in the transfer cylinder 33 to be discharged from the discharge port 303 to the external equipment, thus supplying the powder. After the discharge is completed, the second piston plate 19 moves back to the inlet of the transfer cylinder 33, minimizing the effective volume of the transfer cylinder 33 and preventing gas from the external equipment from entering the intermediate pipe 11 through the transfer cylinder 33. This completely isolates the powder in the intermediate pipe 11 and the conveying pipe 1 from the external equipment. Then, the powder can be repeatedly transferred through the transfer cylinder 33 according to the required amount of powder.This method of powder supply avoids the direct entry of high-temperature gases, high-temperature water vapor, and other substances generated in external equipment into the conveying pipe 1, thus preventing contamination and adhesion of the powder within the conveying pipe 1. Furthermore, the transfer cylinder 33 does not need to be aligned with the discharge port 303 when not in use, further preventing the internal components of the transfer cylinder 33 from being affected by external factors. Powder adhering to the outer wall of the rotating ball 28 is scraped off by the edge of the discharge port 303 during rotation and then enters the external equipment through the discharge port 303, leaving no residue. Powder adhering to the inner wall of the transfer cylinder 33 can also be pushed out by the second piston plate 19 and discharged through the discharge port 303. Powder adhering to the inner wall of the transfer cylinder 33 and the surface of the second piston plate 19 is further scraped off by the elastic brush 32, thus detaching from the transfer cylinder 33 and being discharged. The material is discharged from the outlet 303. When the elastic brush 32 moves to the position where it aligns with the locking protrusion 22, the locking protrusion 22 limits the movement of the elastic brush 32, thereby forcing the elastic brush 32 to deform. During the deformation process, the elastic brush 32 stores elastic potential energy until it disengages from the locking protrusion 22. At this point, the elastic brush 32 can not only scrape the surface of the locking protrusion 22 sequentially, but also release its own elastic potential energy, causing it to vibrate. During the vibration of the elastic brush 32, the powder on the elastic brush 32 will be vibrated off and discharged from the outlet 303, thus ensuring the cleanliness of the inside of the transfer cylinder 33 and the outlet 303. This greatly reduces the area where powder can adhere to the equipment, thereby effectively avoiding various problems caused by powder adhesion.

[0033] Please see Figures 1 to 6 The stirring motor 601, the first drive motor 7, and the second drive motor 4 are all stepper motors, and the second push rod 29 is an electric push rod. The controller 9 is electrically connected to the stirring motor 601, the first drive motor 7, the second drive motor 4, and the second push rod 29, respectively.

[0034] Example 2: Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 6Based on Embodiment 1, the inner tube 13 is connected to the inside of the intermediate tube 11 by a flexible connecting ring 12, and the inner tube 13 is used to connect the conveying pipe 1 and the feed port 301. A vibration device 2 for striking the inner tube 13 is provided on the intermediate tube 11, and the vibration device 2 includes a connecting housing 201 fixed on the intermediate tube 11. An auxiliary magnet 204 is connected to the connecting housing 201 by a first return spring 203. An impact head 202 for striking the inner tube 13 is fixedly installed at the bottom of the auxiliary magnet 204. An electromagnet 30 for driving the movement of the auxiliary magnet 204 is provided at one end of the corresponding transfer cylinder 33 inside the rotating ball 28. The electromagnet 30 is electrically connected to the controller 9. The flexible connecting ring 12 is a rubber ring, and a second return spring 10 for maintaining the position of the inner tube 13 is provided between the inner tube 13 and the intermediate tube 11. When the outlet end of the transfer cylinder 33 rotates to align with the outlet end of the inner tube 13, the electromagnet 30 is energized, causing the auxiliary magnet 204 to be attracted downwards. This allows the impact head 202 to strike the inner tube 13, vibrating it. The vibration of the inner tube 13 causes the powder on its inner wall to fall off and enter the transfer cylinder 33, preventing powder from remaining or adhering inside. Periodically energizing the electromagnet 30 causes periodic vibration on the surface of the inner tube 13, ensuring that all powder in the inner tube 13 enters the transfer cylinder 33. When the electromagnet 30 stops working, the inner tube 13 gradually stops vibrating under the damping effect of the second return spring 10, and then maintains its original position with the assistance of the second return spring 10, awaiting the next round of powder conveying.

[0035] Example 3: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6Based on Embodiment 2, a cleaning fitting pipe 18 is fixedly installed on the left side of the spherical shell 302, and the lower end of the cleaning fitting pipe 18 is connected to a waste discharge pipe 17 for discharging waste. A first push rod 16 is fixedly installed at the end of the cleaning fitting pipe 18, and the output end of the first push rod 16 drives a first piston plate 26 that slides along the inner cavity of the cleaning fitting pipe 18. A first cleaning motor 25 is fixedly installed on the first piston plate 26, and the output end of the first cleaning motor 25 drives a cleaning brush 27 for cleaning the surface of the second piston plate 19 and the inner wall of the transfer cylinder 33. The first push rod 16 and the first cleaning motor 25 are electrically connected to the controller 9. An air nozzle 24 for spraying air into the inside of the transfer cylinder 33 is fixedly installed on the first piston plate 26, and an air intake pump 15 is fixedly installed on the spherical shell 302. The outlet end of the air intake pump 15 is connected to the air nozzle 24 through a connecting hose 23, and the air intake pump 15 is electrically connected to the controller 9. During normal operation, the transfer cylinder 33 will only swing up and down along the right side of the spherical shell 302 to achieve the purpose of connecting the feed inlet 301 and the discharge outlet 303. When the inside of the transfer cylinder 33 needs to be cleaned, the second drive motor 4 will drive the inlet end of the transfer cylinder 33 to align with the inner cavity of the cleaning fitting tube 18. Then, the first push rod 16 will drive the first piston plate 26 to move towards the transfer cylinder 33. At the same time, the first cleaning motor 25 will start to drive the cleaning brush 27 to clean the inner wall of the transfer cylinder 33, the inner wall of the second piston plate 19, and the surface of the elastic brush 32. During the cleaning process, the air pump 15 will also deliver gas to the jet nozzle 24 through the connecting hose 23, and then the jet nozzle 24 will spray it into the inside of the transfer cylinder 33. At this time, the powder inside the transfer cylinder 33 will be carried by the gas and discharged from the waste discharge pipe 17. After the cleaning is completed, the first piston plate 26 will return to the non-working position inside the cleaning fitting tube 18. This method can further enable automatic cleaning of the inside of the transfer cylinder 33, avoiding the trouble of manual cleaning, allowing the equipment to be automatically maintained without stopping the machine, and improving the working efficiency of the equipment.

[0036] Example 4: Please refer to Figure 1 and Figure 3 Based on Embodiment 3, a spiral-shaped heat-insulating channel 20 is formed on the inner wall of the conveying pipe 1, and the left and right ends of the heat-insulating channel 20 are connected to the drain pipe 14 and the inlet pipe 8, respectively. The drain pipe 14 and the inlet pipe 8 are connected to an external heat-insulating liquid circulation supply device. After the external heat-insulating liquid supply device supplies heat-insulating liquid into the heat-insulating channel 20, the heat in this heat-insulating liquid will be transferred to the powder located in the conveying pipe 1 through the conveying pipe 1, thereby maintaining the temperature of the powder and ensuring that the powder is within the optimal operating temperature range. The heat-insulating liquid can be water at a preset temperature.

[0037] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A spiral powder metering feeding device, comprising a conveying pipe (1), wherein a first drive motor (7) is fixedly installed on the right side of the conveying pipe (1), and the output end of the first drive motor (7) drives a conveying auger (21) inserted into the conveying pipe (1), wherein the conveying pipe (1) is fed to the conveying auger (21) through a feed hopper (5), characterized in that: The feed hopper (5) is equipped with a mixing device (6) for mixing powder. The mixing device (6) includes a stirring motor (601) fixed in the feed hopper (5), and the output end of the stirring motor (601) drives a spiral blade (603) for mixing powder coaxially through a stirring paddle (602). The output end of the conveying pipe (1) is connected to a discharge device (3) through an intermediate pipe (11), and the discharge device (3) includes a spherical shell (302). The upper end of the spherical shell (302) is connected to the feed inlet. (301) Connecting to the intermediate tube (11), and the lower end of the spherical shell (302) is connected to the external equipment through the discharge port (303). The spherical shell (302) is driven by the second drive motor (4) to rotate a ball (28), and the rotating ball (28) is provided with a transfer cylinder (33) for transferring powder. The transfer cylinder (33) is provided with a second piston plate (19), and a second push rod (29) for driving the second piston plate (19) to slide along the transfer cylinder (33) is fixedly installed in the transfer ball (28).

2. The spiral powder metering feeder according to claim 1, characterized in that: The stirring motor (601), the first drive motor (7) and the second drive motor (4) are all stepper motors, and the second push rod (29) is an electric push rod. A controller (9) is fixedly installed on the conveying pipe (1), and the controller (9) is electrically connected to the stirring motor (601), the first drive motor (7), the second drive motor (4) and the second push rod (29) respectively.

3. The spiral powder metering feeder according to claim 2, characterized in that: The stirring paddle (602) has stirring blades (604) for stirring and mixing powder on the outside of the corresponding spiral blades (603), and a scraper (605) for scraping powder on the inner wall of the feed hopper (5) is fixedly installed at the end of the stirring paddle (602).

4. The spiral powder metering feeder according to claim 2, characterized in that: A second cleaning motor (31) is fixedly installed inside the second piston plate (19), and the output end of the second cleaning motor (31) drives an elastic brush (32) for cleaning the surface of the second piston plate (19) and the inner wall of the transfer cylinder (33). The second cleaning motor (31) is electrically connected to the controller (9).

5. The spiral powder metering feeder according to claim 4, characterized in that: The discharge port (303) is integrally formed with a locking protrusion (22) for locking the end of the elastic brush (32) and causing the elastic brush (32) to deform and then pop out. The elastic brush (32) is made of plastic or metal spring sheet.

6. The spiral powder metering feeder according to claim 2, characterized in that: The interior of the intermediate tube (11) is connected to the inner tube (13) by a flexible connecting ring (12), and the inner tube (13) is used to connect the conveying pipe (1) and the feed port (301). The intermediate tube (11) is provided with a vibration device (2) for striking the inner tube (13), and the vibration device (2) includes a connecting housing (201) fixed on the intermediate tube (11), and an auxiliary magnet (204) is connected inside the connecting housing (201) by a first reset spring (203). An impact head (202) for striking the inner tube (13) is fixedly installed at the bottom of the auxiliary magnet (204). The rotating ball (28) is provided with an electromagnet (30) for driving the movement of the auxiliary magnet (204) at one end of the corresponding transfer cylinder (33), and the electromagnet (30) is electrically connected to the controller (9).

7. The spiral powder metering feeder according to claim 6, characterized in that: The flexible connecting ring (12) is a rubber ring, and a second return spring (10) for maintaining the position of the inner tube (13) is provided between the inner tube (13) and the intermediate tube (11).

8. The spiral powder metering feeder according to claim 2, characterized in that: A cleaning fitting tube (18) is fixedly installed on the left side of the spherical shell (302), and the lower end of the cleaning fitting tube (18) is connected to a waste discharge tube (17) for discharging waste. A first push rod (16) is fixedly installed at the end of the cleaning fitting tube (18), and the output end of the first push rod (16) drives a first piston plate (26) that slides along the inner cavity of the cleaning fitting tube (18). A first cleaning motor (25) is fixedly installed on the first piston plate (26), and the output end of the first cleaning motor (25) drives a cleaning brush (27) for cleaning the surface of the second piston plate (19) and the inner wall of the transfer cylinder (33). The first push rod (16) and the first cleaning motor (25) are electrically connected to the controller (9).

9. The spiral powder metering feeder according to claim 8, characterized in that: A jet head (24) for spraying air into the inside of the transfer cylinder (33) is fixedly installed on the first piston plate (26), and an air intake pump (15) is fixedly installed on the spherical shell (302). The outlet end of the air intake pump (15) is connected to the jet head (24) through a connecting hose (23), and the air intake pump (15) is electrically connected to the controller (9).

10. The spiral powder metering feeder according to claim 1, characterized in that: The inner wall of the conveying pipe (1) is provided with a spiral heat-insulating flow channel (20), and the left and right ends of the heat-insulating flow channel (20) are connected to the drain pipe (14) and the inlet pipe (8) respectively. The drain pipe (14) and the inlet pipe (8) are connected to an external heat-insulating liquid circulation supply device.

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