Powder helical ribbon mixer

Abstract

The invention discloses a powder helical ribbon mixer which comprises a base, a mixing chamber is fixedly mounted on the base, a central shaft is rotatably mounted in the mixing chamber, helical blades for stirring are fixed on the central shaft, and a rotary power device for driving the central shaft to rotate is mounted on the base. An upper sealing plate is arranged at the upper end of the mixing chamber, at least one feeding port is formed in the upper sealing plate, a feeding hopper is arranged on the feeding port, a feeding blocking structure for blocking a packaging bag is arranged on the feeding hopper, a discharging pipe is arranged at the bottom of the mixing chamber, a discharging hopper is arranged at the lower end of the discharging pipe, and the discharging hopper is connected with the discharging pipe. A valve assembly for opening and closing the discharging pipe is arranged on the discharging pipe, and a blanking stirring device for performing auxiliary blanking on materials falling into the discharging hopper is arranged on the discharging hopper; according to the helical ribbon mixer, packaging bags can be prevented from falling into the mixing chamber during feeding, and meanwhile, the discharging smoothness can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder packaging, in particular to a powder ribbon mixer. Background Art

[0002] In the field of powder mixing and packaging technology, a powder ribbon mixer can mix a variety of powders (granular materials) and then transport them to a packaging machine for packaging through a screw conveyor.

[0003] The conventional powder ribbon mixer mainly includes a machine base, a mixing chamber is fixedly installed on the machine base, a central shaft is rotatably installed in the mixing chamber, a spiral blade for stirring is fixed on the central shaft, a rotating power device for driving the central shaft to rotate is installed on the machine base, and a discharge port and a valve are arranged at the bottom of the mixing chamber. For example, the public document with the application publication number CN118403517A records a high-efficiency horizontal ribbon mixer for waste salt treatment, which discloses the above technical features, but this ribbon mixer still has the following defects: 1. The upper cover needs to be opened when the horizontal ribbon mixer is fed, which is troublesome to operate; and the packaging bag may fall into the machine when feeding; 2. When the horizontal ribbon mixer is discharged, the powder will be discharged from the discharge port when the valve is opened, but because the powder may not be dry enough during the storage process, it may not be smooth enough when discharged from the powder. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a powder ribbon mixer, which can prevent the packaging bag from falling into the mixing chamber during feeding and improve the smoothness of discharging.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a powder spiral ribbon mixer, comprising a machine base, a mixing chamber is fixedly installed on the machine base, a central shaft is rotatably installed in the mixing chamber, a spiral blade for stirring is fixed on the central shaft, a rotating power device for driving the central shaft to rotate is installed on the machine base, an upper sealing plate is arranged at the upper end of the mixing chamber, at least one feed port is arranged on the upper sealing plate, a feed hopper is arranged on the feed port, a feed blocking structure for blocking the packaging bag is arranged on the feed hopper, a discharge pipe is arranged at the bottom of the mixing chamber, a discharge hopper is arranged at the lower end of the discharge pipe, a valve assembly for opening and closing the discharge pipe is arranged on the discharge pipe, and a dropping stirring device for assisting the dropping of materials falling into the discharge hopper is arranged on the discharge hopper.

[0006] As a preferred scheme, the blanking stirring device includes a pair of upper rotating shafts and a pair of lower rotating shafts rotatably mounted on the discharging hopper, the pair of upper rotating shafts are horizontally arranged in parallel, the pair of lower rotating shafts are horizontally arranged in parallel and located below the upper rotating shaft, the upper rotating shaft and the lower rotating shaft are each provided with a plurality of stirring rods perpendicular to the upper rotating shaft and the lower rotating shaft, the stirring rods are located in the discharging hopper, a blanking stirring rotating power device is fixedly mounted on the outside of the discharging hopper, the blanking stirring rotating power device is transmission-connected to one of the upper rotating shafts or the lower rotating shaft, a first transmission mechanism is arranged between the pair of upper rotating shafts, a second transmission mechanism is arranged between one of the upper rotating shafts and the lower rotating shaft, and a third transmission mechanism is arranged between the pair of lower rotating shafts.

[0007] As a preferred solution, the first transmission mechanism includes an upper driving gear and an upper driven gear that are meshed with each other, one of the upper rotating shafts is a driving rotating shaft and is fixed to the upper driving gear, the driving rotating shaft is connected to the output end of the blanking stirring rotating power device, the other upper rotating shaft serves as a passive rotating shaft and is fixed to the upper driven gear, the second transmission mechanism includes a driving sprocket fixed to the other end of the passive rotating shaft, a driven sprocket is fixed at the end of one of the lower rotating shafts, the driven sprocket and the driving sprocket are transmission-connected, the third transmission mechanism includes a lower driven gear and a lower driving gear fixed to the ends of a pair of lower rotating shafts, the lower driven gear and the lower driving gear are meshed with each other, and the lower driven gear and the upper driven gear are respectively located on opposite sides of the discharge hopper.

[0008] As a preferred solution, a circular discharge port is arranged at the bottom of the mixing chamber, a valve stem is rotatably mounted on the discharge pipe, a connecting valve seat is fixed on the valve stem, a valve sealing plate for blocking the discharge port is fixedly mounted on the connecting valve seat, both ends of the valve stem extend to the outside of the discharge pipe, driving arms are fixed on both ends of the valve stem, a cylinder support is fixed on the discharge pipe, and a valve deflection cylinder for driving the valve sealing plate to deflect is hinged between the cylinder support and the driving arm.

[0009] As a preferred solution, the feed blocking structure includes a blocking grid fixed in the feed hopper.

[0010] As a preferred solution, the central shaft, spiral blades, valve assembly, upper rotating shaft, lower rotating shaft and stirring rod are all sprayed with an anti-static coating, and the inner walls of the mixing chamber, feed hopper, discharge pipe and discharge hopper are provided with a polytetrafluoroethylene layer.

[0011] As a preferred solution, the outside of the mixing chamber is further wrapped with an outer shell, a cooling channel is formed between the outer shell and the chamber wall of the mixing chamber, and a cooling medium inlet and a cooling medium outlet are provided on the outer shell.

[0012] After adopting the above technical scheme, the effect of the present invention is as follows: the powder spiral ribbon mixer includes a machine base, a mixing chamber is fixedly installed on the machine base, a central shaft is rotatably installed in the mixing chamber, a spiral blade for stirring is fixed on the central shaft, a rotating power device for driving the central shaft to rotate is installed on the machine base, an upper sealing plate is arranged at the upper end of the mixing chamber, at least one feed port is arranged on the upper sealing plate, a feed hopper is arranged on the feed port, a feed blocking structure for blocking the packaging bag is arranged on the feed hopper, a discharge pipe is arranged at the bottom of the mixing chamber, and a discharge pipe is arranged at the lower end of the discharge pipe. The discharge pipe is provided with a valve assembly for opening and closing the discharge pipe, and the discharge hopper is provided with a material dropping and stirring device for assisting the material falling into the discharge hopper; the powder is poured into the feeding port, and the feeding blocking structure prevents the entry of the packaging bag, and then the discharge pipe is closed by the valve assembly, and the rotary power device drives the central shaft to rotate and drives the spiral blade to rotate, so that the powder in the mixing chamber is fully mixed, and then the discharge pipe is opened, and the powder falls into the discharge hopper, and the stirring and dropping of the material is completed by the material dropping and stirring device; the spiral ribbon mixer can prevent the packaging bag from falling into the mixing chamber during feeding, and at the same time can improve the smoothness of discharging.

[0013] Furthermore, the blanking stirring device comprises a pair of upper rotating shafts and a pair of lower rotating shafts rotatably mounted on the discharge hopper, the pair of upper rotating shafts are arranged horizontally and in parallel, the pair of lower rotating shafts are arranged horizontally and in parallel and are located below the upper rotating shaft, the upper rotating shaft and the lower rotating shaft are both provided with a plurality of stirring rods which are perpendicular to the upper rotating shaft and the lower rotating shaft, the stirring rods are located in the discharge hopper, a blanking stirring rotating power device is fixedly mounted on the outside of the discharge hopper, the blanking stirring rotating power device is transmission-connected to one of the upper rotating shafts or the lower rotating shaft, and the pair of upper rotating shafts are connected to each other. A first transmission mechanism is provided, a second transmission mechanism is provided between an upper rotating shaft and a lower rotating shaft, and a third transmission mechanism is provided between a pair of the lower rotating shafts; the powder material falling into the discharge hopper can be effectively stirred by the stirring rod, and the material falling is smooth, and after the upper rotating shaft is driven to rotate by the material falling stirring and rotating power device, the first transmission mechanism drives the other upper rotating shaft to rotate, and then the second transmission mechanism drives one of the lower rotating shafts to rotate, and the third transmission mechanism can make the other lower rotating shaft rotate, and the transmission in sequence is stable and reliable, and the use of the power device is reduced, thereby reducing the use cost.

[0014] Furthermore, since the first transmission mechanism includes an upper driving gear and an upper driven gear that mesh with each other, one of the upper rotating shafts is a driving rotating shaft and is fixed to the upper driving gear, the driving rotating shaft is connected to the output end of the blanking stirring rotating power device, and the other upper rotating shaft serves as a passive rotating shaft and is fixed to the upper driven gear, the second transmission mechanism includes a driving sprocket fixed to the other end of the passive rotating shaft, a driven sprocket is fixed to the end of one of the lower rotating shafts, and the driven sprocket and the driving sprocket are transmission-connected, the third transmission mechanism includes a lower driven gear and a lower driving gear fixed to the ends of a pair of lower rotating shafts, the lower driven gear and the lower driving gear mesh with each other, and the lower driven gear and the upper driven gear are respectively located on opposite sides of the discharge hopper; transmission is carried out in sequence to ensure accurate and stable use.

[0015] Since a circular discharge port is arranged at the bottom of the mixing chamber, a valve stem is rotatably installed on the discharge pipe, a connecting valve seat is fixed on the valve stem, a valve sealing plate for sealing the discharge port is fixedly installed on the connecting valve seat, both ends of the valve stem extend to the outside of the discharge pipe, driving arms are fixed on both ends of the valve stem, a cylinder support is fixed on the discharge pipe, a valve deflection cylinder for driving the valve sealing plate to deflect is hinged between the cylinder support and the driving arm; the driving arm is driven by the valve deflection cylinder to swing and drive the valve stem to rotate, thereby causing the valve sealing plate to swing, thereby opening or blocking the circular discharge port, which is simple and convenient to use.

[0016] Furthermore, since the feed blocking structure comprises a blocking grid fixed in the feed hopper, it can slow down the speed at which the powder enters, and at the same time isolate the packaging bag from entering, thereby ensuring accurate mixing.

[0017] Furthermore, since the central shaft, spiral blades, valve assembly, upper rotating shaft, lower rotating shaft and stirring rod are all sprayed with anti-static coating, the inner walls of the mixing chamber, feed hopper, discharge pipe and discharge hopper are provided with polytetrafluoroethylene layers; thus, the powder can be prevented from adhering to the mixing chamber during mixing, feeding and discharging, and the mixing is accurate and reliable.

[0018] Since the outside of the mixing chamber is also wrapped with an outer shell, a cooling channel is formed between the outer shell and the chamber wall of the mixing chamber, and a cooling medium inlet and a cooling medium outlet are provided on the outer shell; the powder is cooled during mixing to prevent adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 is a stereogram of an embodiment of the present invention;

[0021] Figure 2 is a top view of an embodiment of the present invention;

[0022] Figure 3 is a top cross-sectional view of an embodiment of the present invention;

[0023] Figure 4 1 is a schematic diagram of the structure of a mixing chamber, a discharge pipe and a discharge hopper according to an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of a valve assembly according to an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure inside the discharge hopper of an embodiment of the present invention;

[0026] Figure 7 is a cross-sectional view inside the discharge hopper of an embodiment of the present invention;

[0027] Figure 8 It is a schematic diagram of the structure outside the discharge hopper of an embodiment of the present invention;

[0028] In the attached figure: 1. base; 2. mixing chamber; 3. central axis; 4. spiral blade; 5. upper sealing plate; 6. feed port; 7. feed hopper; 8. discharge pipe; 9. discharge hopper; 10. rotating motor; 11. reducer; 12. upper rotating shaft; 13. lower rotating shaft; 14. stirring rod; 15. upper driving gear; 16. upper driven gear; 17. driving sprocket; 18. driven sprocket; 19. lower driven gear; 20. lower driving gear; 21. blanking stirring motor; 22. circular discharge port; 23. valve stem; 24. connecting valve seat; 25. valve sealing plate; 26. driving arm; 27. cylinder support; 28. valve deflection cylinder; 29. ​​blocking grid; 30. outer shell; 31. cooling channel; 32. cooling medium inlet; 33. cooling medium outlet. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below through specific examples.

[0030] like Figures 1 to 8 As shown, a powder spiral ribbon mixer comprises a machine base 1, on which a mixing chamber 2 is fixedly mounted, in which a central shaft 3 is rotatably mounted, on which a spiral blade 4 for stirring is fixed, and on which a rotating power device for driving the central shaft 3 to rotate is mounted, and on which an upper sealing plate 5 is arranged at the upper end of the mixing chamber 2, on which at least one feed port 6 is arranged, on which a feed hopper 7 is arranged, and on which a feed blocking structure for blocking a packaging bag is arranged, and on which a discharge pipe 8 is arranged at the bottom of the mixing chamber 2, and on which a discharge hopper 9 is arranged at the lower end, and on which a valve assembly for opening and closing the discharge pipe 8 is arranged, and on which a material dropping and stirring device for assisting the material falling into the discharge hopper 9 is arranged.

[0031] The rotary power device includes a rotary motor 10 and a reducer 11, which can ensure that the driving center shaft 3 rotates stably and reliably. The spiral blade 4 is an existing structure and is therefore not described in detail herein.

[0032] like Figure 6 and Figure 7 As shown, the blanking stirring device includes a pair of upper rotating shafts 12 and a pair of lower rotating shafts 13 rotatably mounted on the discharge hopper 9, the pair of upper rotating shafts 12 are arranged horizontally and in parallel, the pair of lower rotating shafts 13 are arranged horizontally and in parallel and are located below the upper rotating shaft 12, and the upper rotating shaft 12 and the lower rotating shaft 13 are both provided with a plurality of stirring rods 14 which are perpendicular to the upper rotating shaft 12 and the lower rotating shaft 13, the stirring rods 14 are located in the discharge hopper 9, and a blanking stirring rotating power device is fixedly installed on the outside of the discharge hopper 9, the blanking stirring rotating power device is transmission-connected to one of the upper rotating shafts 12 or the lower rotating shaft 13, and the pair of upper rotating shafts 12 and the lower rotating shaft 13 are both provided with a plurality of stirring rods 14 which are perpendicular to the upper rotating shaft 12 and the lower rotating shaft 13, the stirring rods 14 are located in the discharge hopper 9, and a blanking stirring rotating power device is fixedly installed on the outside of the discharge hopper 9, and the blanking stirring rotating power device is transmission-connected to one of the upper rotating shafts 12 or the lower rotating shaft 13, and the pair of upper rotating shafts 12 and the lower rotating shaft 13 are both provided with a plurality of stirring rods 14 which are perpendicular to the upper rotating shaft 12 and the lower rotating shaft 13, the stirring rods 14 are located in the discharge hopper 9, and the blanking stirring rotating power device is transmission-connected to the upper rotating shaft 12 or the lower rotating shaft 13. A first transmission mechanism is arranged between the rotating shafts 12, a second transmission mechanism is arranged between one of the upper rotating shafts 12 and the lower rotating shaft 13, and a third transmission mechanism is arranged between a pair of the lower rotating shafts 13; the powder material falling into the discharge hopper 9 can be effectively stirred by the stirring rod 14, and the material falling is smooth, and after the upper rotating shaft 12 is driven to rotate by the material falling stirring and rotating power device, the first transmission mechanism drives the other upper rotating shaft 12 to rotate, and then the second transmission mechanism drives one of the lower rotating shafts 13 to rotate, and the third transmission mechanism can make the other lower rotating shaft 13 rotate, and the transmission in sequence is stable and reliable, and the use of the power device is reduced, thereby reducing the use cost.

[0033] Further, the first transmission mechanism includes an upper driving gear 15 and an upper driven gear 16 meshing with each other, one of the upper rotating shafts 12 is a driving rotating shaft and is fixed to the upper driving gear 15, the driving rotating shaft is connected to the output end of the blanking stirring rotating power device, the other upper rotating shaft 12 is a passive rotating shaft and is fixed to the upper driven gear 16, the second transmission mechanism includes a driving sprocket 17 fixed to the other end of the passive rotating shaft, and a driven sprocket 18 is fixed to the end of one of the lower rotating shafts 13, the driven sprocket 18 and the driving sprocket 17 are connected in transmission, and the third transmission mechanism The mechanism includes a lower driven gear 19 and a lower driving gear 20 fixed to the ends of a pair of lower rotating shafts 13, the lower driven gear 19 and the lower driving gear 20 are meshed with each other, and the lower driven gear 19 and the upper driven gear 16 are respectively located on the opposite sides of the discharge hopper 9; the blanking stirring and rotating power device is a blanking stirring motor 21 and a reducer 11, which first drives the active rotating shaft to rotate to drive the upper driving gear 15 to rotate, and the upper driven gear 16 rotates, which is transmitted to the driven sprocket 18 through the driving sprocket 17, and then the lower driving gear 20 rotates, which drives the lower driven gear 19 to rotate, completing the transmission in sequence, to ensure accurate and stable use.

[0034] like Figures 3 to 5 As shown, a circular discharge port 22 is arranged at the bottom of the mixing chamber 2, a valve stem 23 is rotatably mounted on the discharge pipe 8, a connecting valve seat 24 is fixed on the valve stem 23, a valve sealing plate 25 for blocking the discharge port is fixedly mounted on the connecting valve seat 24, both ends of the valve stem 23 extend out of the discharge pipe 8, driving arms 26 are fixed on both ends of the valve stem 23, a cylinder support 27 is fixed on the discharge pipe 8, a valve deflection cylinder 28 for driving the valve sealing plate 25 to deflect is hinged between the cylinder support 27 and the driving arm 26; the driving arm 26 is driven by the valve deflection cylinder 28 to swing and drive the valve stem 23 to rotate, thereby causing the valve sealing plate 25 to swing, thereby opening or blocking the circular discharge port 22, which is simple and convenient to use.

[0035] like Figure 2 As shown, the feed blocking structure includes a blocking grid 29 fixed in the feed hopper 7; two feed hoppers 7 are provided on the upper sealing plate 5, so that two different powders can be poured in at the same time to improve efficiency, while isolating the packaging bags from entering to ensure accurate mixing.

[0036] In this embodiment, the central shaft 3, spiral blades 4, valve assembly, upper rotating shaft 12, lower rotating shaft 13 and stirring rod 14 are all sprayed with anti-static coating, and the inner walls of the mixing chamber 2, feed hopper 7, discharge pipe 8 and discharge hopper 9 are provided with a polytetrafluoroethylene layer; in this way, the powder can be prevented from sticking to the mixing chamber 2 during mixing, feeding and discharging, and the mixing is accurate and reliable.

[0037] Furthermore, the outside of the mixing chamber 2 is also wrapped with an outer shell 30, a cooling channel 31 is formed between the outer shell 30 and the chamber wall of the mixing chamber 2, and a cooling medium inlet 32 ​​and a cooling medium outlet 33 are provided on the outer shell to cool the powder during mixing to prevent adhesion.

[0038] The working principle of this embodiment is as follows: first, the powder is poured into the mixing chamber 2 through the feed hopper 7, and then the rotating motor 10 drives the central shaft 3 to rotate through the reducer 11, driving the spiral blade 4 to stir and mix the powder. At the same time, the valve deflection cylinder 28 drives the driving arm 26 to swing and drive the valve stem 23 to rotate, and the valve sealing plate 25 swings to block the circular discharge port 22. The cooling medium enters the cooling channel 31 from the cooling medium inlet 32 ​​and is then discharged from the cooling medium outlet 33 to form a cycle to cool the mixing chamber 2. After the powder is fully mixed, the circular discharge port 22 is opened, and the powder enters the discharge hopper 9. The blanking stirring motor 21 first drives the active rotating shaft to rotate through the reducer 11 to drive the upper active gear 15 to rotate, and then the upper driven gear 16 rotates, and then the upper driven gear 16 is transmitted to the driven sprocket 18 through the active sprocket 17. Then, after the lower active gear 20 rotates, the lower driven gear 19 is driven to rotate, so that the upper rotating shaft 12 and the lower rotating shaft 13 are continuously rotated, and the stirring rod 14 stirs the powder in the discharge hopper 9 to discharge the material.

[0039] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A powder spiral ribbon mixer, comprising a machine base, a mixing chamber fixedly mounted on the machine base, a central shaft rotatably mounted in the mixing chamber, a spiral blade for stirring fixed on the central shaft, a rotary power device for driving the central shaft to rotate mounted on the machine base, characterized in that: An upper sealing plate is provided at the upper end of the mixing chamber, at least one feed port is provided on the upper sealing plate, a feed hopper is provided on the feed port, a feed blocking structure for blocking the packaging bag is provided on the feed hopper, a discharge pipe is provided at the bottom of the mixing chamber, a discharge hopper is provided at the lower end of the discharge pipe, a valve assembly for opening and closing the discharge pipe is provided on the discharge pipe, and a dropping stirring device for assisting the dropping of materials falling into the discharge hopper is provided on the discharge hopper.

2. A powder ribbon mixer according to claim 1, characterized in that: The blanking stirring device includes a pair of upper rotating shafts and a pair of lower rotating shafts rotatably mounted on the discharging hopper, the pair of upper rotating shafts are arranged horizontally and parallel, the pair of lower rotating shafts are arranged horizontally and parallel and are located below the upper rotating shaft, the upper rotating shaft and the lower rotating shaft are each provided with a plurality of stirring rods perpendicular to the upper rotating shaft and the lower rotating shaft, the stirring rods are located in the discharging hopper, a blanking stirring rotating power device is fixedly mounted on the outside of the discharging hopper, the blanking stirring rotating power device is transmission-connected to one of the upper rotating shafts or the lower rotating shaft, a first transmission mechanism is arranged between the pair of upper rotating shafts, a second transmission mechanism is arranged between one of the upper rotating shafts and the lower rotating shaft, and a third transmission mechanism is arranged between the pair of lower rotating shafts.

3. A powder ribbon mixer as claimed in claim 2, characterized in that: The first transmission mechanism includes an upper driving gear and an upper driven gear that are meshed with each other, one of the upper rotating shafts is a driving rotating shaft and is fixed to the upper driving gear, the driving rotating shaft is connected to the output end of the blanking stirring rotating power device, the other upper rotating shaft is used as a passive rotating shaft and is fixed to the upper driven gear, the second transmission mechanism includes a driving sprocket fixed to the other end of the passive rotating shaft, a driven sprocket is fixed at the end of one of the lower rotating shafts, the driven sprocket and the driving sprocket are transmission-connected, the third transmission mechanism includes a lower driven gear and a lower driving gear fixed to the ends of a pair of lower rotating shafts, the lower driven gear and the lower driving gear are meshed with each other, and the lower driven gear and the upper driven gear are respectively located on opposite sides of the discharge hopper.

4. A powder ribbon mixer as claimed in claim 3, characterized in that: A circular discharge port is arranged at the bottom of the mixing chamber, a valve stem is rotatably mounted on the discharge pipe, a connecting valve seat is fixed on the valve stem, a valve sealing plate for blocking the discharge port is fixedly mounted on the connecting valve seat, both ends of the valve stem extend to the outside of the discharge pipe, driving arms are fixed on both ends of the valve stem, a cylinder support is fixed on the discharge pipe, and a valve deflection cylinder for driving the valve sealing plate to deflect is hinged between the cylinder support and the driving arm.

5. A powder ribbon mixer as claimed in claim 4, characterized in that: The feed blocking structure includes a blocking grid fixed in the feed hopper.

6. A powder ribbon mixer as claimed in claim 5, characterized in that: The central shaft, spiral blades, valve assembly, upper rotating shaft, lower rotating shaft and stirring rod are all sprayed with antistatic coating, and the inner walls of the mixing chamber, feed hopper, discharge pipe and discharge hopper are provided with polytetrafluoroethylene layer.

7. A powder ribbon mixer as claimed in claim 6, characterized in that: The outside of the mixing chamber is also wrapped with an outer shell, a cooling channel is formed between the outer shell and the chamber wall of the mixing chamber, and a cooling medium inlet and a cooling medium outlet are arranged on the outer shell.

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