Mixing equipment for plastic raw material processing

Abstract

The invention is suitable for the technical field of raw material mixing, and provides mixing equipment for plastic raw material processing. The powder and liquid premixing cavity is installed on the supporting frame, and a feeding channel is arranged on the powder and liquid premixing cavity and matched with the coarse mixing cavity; the powder and liquid premixing assembly is mounted in the powder and liquid premixing cavity; the heat dissipation type coarse mixing assembly is mounted on the supporting frame and located in the coarse mixing cavity, and comprises a multi-purpose driving assembly mounted on the supporting frame; the self-rotating stirring assembly is connected with the multi-purpose driving assembly and is arranged in the coarse mixing cavity; and the heat dissipation material scraping assembly is connected with the multi-purpose driving assembly, is arranged in the coarse mixing cavity and is used for scraping the raw materials on the inner wall of the coarse mixing cavity during rotation and carrying out air cooling heat dissipation on the raw materials. The powder-liquid premixing assembly is used for premixing powder raw materials and liquid raw materials, dust raising, scattering and large wet mass generation caused by direct feeding of the powder raw materials are avoided, the heat dissipation type coarse mixing assembly is further arranged, air cooling heat dissipation is conducted through the heat dissipation material scraping assembly, and cooling is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of raw material mixing, and particularly relates to a mixing device for plastic raw material processing. Background Art

[0002] Plastic processing requires rough mixing of various raw materials. The raw materials include not only granular raw materials such as resin matrix, but also powder additives such as talcum powder and carbon black, and liquid additives such as plasticizers and mineral oils. If these raw materials are directly added to the reaction kettle and stirred, it is easy to cause powder raw materials to dust, and the liquid raw materials are also prone to form "wet masses", affecting subsequent processing; in addition, during the stirring process, there will be a problem of heat generation due to friction, resulting in temperature rise. If there are heat-sensitive materials in the raw materials, the temperature rise may cause the raw materials to fail. Summary of the Invention

[0003] The purpose of the embodiment of the present invention is to provide a mixing device for plastic raw material processing, aiming to solve the problems existing in the above background art.

[0004] The embodiment of the present invention is implemented as follows. A mixing device for plastic raw material processing includes: A rough mixing chamber; A powder-liquid premixing chamber, installed on a support frame, and a feeding channel is provided on the powder-liquid premixing chamber to cooperate with the rough mixing chamber; A powder-liquid premixing assembly, installed in the powder-liquid premixing chamber, for premixing powder raw materials and liquid raw materials; A heat dissipation type rough mixing assembly, installed on the support frame and located in the rough mixing chamber; Among them, the heat dissipation type rough mixing assembly includes: A multi-purpose driving assembly, installed on the support frame; A self-rotating stirring assembly, connected to the multi-purpose driving assembly, placed in the rough mixing chamber, for stirring and mixing raw materials while rotating self and revolving around the axis; A heat dissipation scraping assembly, connected to the multi-purpose driving assembly, placed in the rough mixing chamber, for scraping the raw materials on the inner wall of the rough mixing chamber when rotating, and performing air-cooling heat dissipation on the raw materials.

[0005] Preferably, the powder-liquid premixing assembly includes: A feed inlet, installed on the powder-liquid premixing chamber; A dosing pipe, located in the powder-liquid premixing chamber, an outlet is provided on the dosing pipe, and the dosing pipe is movably connected to the feed inlet; A driving device one, installed on the powder-liquid premixing chamber, the output end of the driving device one is drivingly connected to a rotating shaft one through a coupling, a driving gear is installed on the rotating shaft one, and the driving gear is continuously engaged with an annular gear installed on the dosing pipe; The second driving device is installed on the outer wall of the powder-liquid premixing chamber. The output end of the second driving device is drivingly connected to the second rotating shaft through a coupling. The second rotating shaft is located inside the powder-liquid premixing chamber, and stirring rods are provided on the second rotating shaft.

[0006] Preferably, the powder-liquid premixing assembly further includes a reciprocating scraping assembly, and the reciprocating scraping assembly includes: A magnetic scraping ring is installed in the powder-liquid premixing chamber and is in contact with the inner wall of the powder-liquid premixing chamber; A magnetic control member is attracted to the magnetic scraping ring, and the magnetic control member is slidably installed in a limiting chute opened on the outer wall of the powder-liquid premixing chamber; A reciprocating driving assembly is connected between the second driving device and the magnetic control member and is used to drive the magnetic control member to move reciprocally up and down.

[0007] Preferably, the reciprocating driving assembly includes: A first rotating wheel is installed on the output end of the second driving device; A second rotating wheel is installed on the powder-liquid premixing chamber, and a first transmission belt is sleeved between the first rotating wheel and the second rotating wheel; A connecting rod, one end of the connecting rod is hingedly installed on the edge of the second rotating wheel, and the other end of the connecting rod is movably hinged to the magnetic control member.

[0008] Preferably, the multi-purpose driving assembly includes: A third driving device is installed on the support frame, and the output end of the third driving device is drivingly connected to the third rotating shaft through a coupling; A third rotating wheel is fixedly connected to the third rotating shaft, and the third rotating wheel is in transmission connection with a fourth rotating wheel through a second transmission belt; A workbench plate is fixedly connected to the fourth rotating wheel, and the fourth rotating wheel is movably connected to the support frame through a connecting sleeve rod; A supporting inner rod is installed on the support frame. The supporting inner rod is located inside the connecting sleeve rod, passes through the fourth rotating wheel and is fixedly connected to a fixed gear through the workbench plate; A first self-rotating gear and a second self-rotating gear are respectively movably connected to the workbench plate. The first self-rotating gear and the second self-rotating gear are respectively located on both sides of the fixed gear and are continuously meshed with the fixed gear. The first self-rotating gear and the second self-rotating gear are connected to the self-rotating stirring assembly.

[0009] Preferably, the self-rotating stirring assembly includes: Stirring rods, there are two stirring rods, which are respectively fixedly connected to the first self-rotating gear and the second self-rotating gear, and the stirring rods are movably connected to the workbench plate; Stirring paddles are installed on the stirring rods.

[0010] Preferably, the heat dissipation scraping assembly includes: A heat dissipation connecting piece, which is fixedly connected to the workbench board, and an air outlet is formed on the heat dissipation connecting piece; A micro fan, which is installed on the workbench board, and the air outlet of the micro fan is connected to the heat dissipation connecting piece; A scraping plate, which is installed on the heat dissipation connecting piece, and the scraping plate is in contact with the inner wall of the rough mixing cavity.

[0011] A mixing device for plastic raw material processing provided by an embodiment of the present invention aims at the problems raised in the prior art. On the premise of being provided with a rough mixing cavity, a powder-liquid premixing cavity is further provided. The powder-liquid premixing component in the powder-liquid premixing cavity is used to premix the powder raw material and the liquid raw material, which can avoid the dust and scattering caused by directly adding the powder raw material, and can also avoid the generation of large wet masses, which is beneficial to subsequent rough mixing, improves the uniformity of raw material mixing. At the same time, a heat dissipation type rough mixing component is also provided, which not only ensures the mixing effect by the self-rotating mixing component, but also uses the heat dissipation scraping component for air-cooled heat dissipation to achieve temperature reduction, and can also scrape the raw materials adhered to the inner wall of the rough mixing cavity for further stirring and mixing, avoiding waste and uneven mixing. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a mixing device for plastic raw material processing provided by an embodiment of the present invention; Figure 2 It is a bottom view of a mixing device for plastic raw material processing provided by an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a powder premixing cavity in a mixing device for plastic raw material processing provided by an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the inside of a rough mixing cavity in a mixing device for plastic raw material processing provided by an embodiment of the present invention; Figure 5 It is a bottom view of the inside of a rough mixing cavity in a mixing device for plastic raw material processing provided by an embodiment of the present invention.

[0013] In the attached drawings: 1 - powder-liquid premixing chamber; 2 - feeding channel; 3 - feed inlet; 4 - dosing pipe; 5 - liquid outlet; 6 - annular gear; 7 - driving gear; 8 - driving device 1; 9 - rotating shaft 1; 10 - driving device 2; 11 - rotating shaft 2; 12 - stirring rod; 13 - magnetic scraping ring; 14 - magnetic control part; 15 - rotating wheel 1; 16 - rotating wheel 2; 17 - transmission belt 1; 18 - connecting rod; 19 - limiting chute; 20 - support frame; 21 - driving device 3; 22 - rotating shaft 3; 23 - rotating wheel 3; 24 - transmission belt 2; 25 - rotating wheel 4; 26 - workbench plate; 27 - self-rotating gear 1; 28 - self-rotating gear 2; 29 - stirring paddle; 30 - connecting sleeve rod; 31 - fixed gear; 32 - supporting inner rod; 33 - rough mixing chamber; 34 - stirring paddle; 35 - heat dissipation connecting part; 36 - micro fan; 37 - scraping plate; 38 - air outlet. Detailed implementation manners

[0014] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0016] As Figures 1 to 2 shown, a structural diagram of a mixing device for plastic raw material processing provided by an embodiment of the present invention includes: Rough mixing chamber 33; Powder-liquid premixing chamber 1, installed on the support frame 20, and a feeding channel 2 is provided on the powder-liquid premixing chamber 1 to cooperate with the rough mixing chamber 33; Powder-liquid premixing assembly, installed in the powder-liquid premixing chamber 1, for premixing powder raw materials and liquid raw materials; Heat dissipation type rough mixing assembly, installed on the support frame 20 and located inside the rough mixing chamber 33; Among them, the heat dissipation type rough mixing assembly includes: Multi-purpose driving assembly, installed on the support frame 20; Self-rotating stirring assembly, connected to the multi-purpose driving assembly, placed inside the rough mixing chamber 33, for stirring and mixing raw materials while rotating and revolving; Heat dissipation scraping assembly, connected to the multi-purpose driving assembly, placed inside the rough mixing chamber 33, for scraping the raw materials on the inner wall of the rough mixing chamber 33 during rotation and air-cooling and dissipating heat from the raw materials.

[0017] In an embodiment of the present invention, in view of the problems raised in the prior art, on the premise of having a rough mixing chamber 33, a powder-liquid premixing chamber 1 is further provided. The powder-liquid premixing assembly in the powder-liquid premixing chamber 1 premixes the powder raw material and the liquid raw material, which can avoid the dusting and scattering caused by directly adding the powder raw material, and also avoid the generation of large wet lumps, which is beneficial to subsequent rough mixing, improves the uniformity of raw material mixing. At the same time, a heat dissipation type rough mixing assembly is also provided, which not only ensures the mixing effect by the self-rotating stirring assembly, but also conducts air-cooling heat dissipation by the heat dissipation scraping assembly to achieve temperature reduction, and can also scrape the raw materials adhered to the inner wall of the rough mixing chamber 33 for further stirring and mixing, avoiding waste and uneven mixing.

[0018] As Figure 3 shown, as a preferred embodiment of the present invention, the powder-liquid premixing assembly includes: A feed inlet 3, installed on the powder-liquid premixing chamber 1; A dosing pipe 4, located inside the powder-liquid premixing chamber 1. An outlet 5 is provided on the dosing pipe 4, and the dosing pipe 4 is movably connected to the feed inlet 3; A driving device one 8, installed on the powder-liquid premixing chamber 1. The output end of the driving device one 8 is drivingly connected to a rotating shaft one 9 through a coupling. A driving gear 7 is installed on the rotating shaft one 9, and the driving gear 7 is continuously engaged with an annular gear 6 installed on the dosing pipe 4; A driving device two 10, installed on the outer wall of the powder-liquid premixing chamber 1. The output end of the driving device two 10 is drivingly connected to a rotating shaft two 11 through a coupling. The rotating shaft two 11 is located inside the powder-liquid premixing chamber 1, and a stirring rod 12 is provided on the rotating shaft two 11.

[0019] Considering the different states of the powder raw material and the liquid raw material, if they are added together, it is easy to form large wet lumps. Therefore, first add the powder raw material into the powder-liquid premixing chamber 1 through the dosing port on the powder-liquid premixing chamber 1, then add the liquid raw material into the dosing pipe 4 through the feed inlet 3. Start the driving device one 8. The driving device one 8 drives the driving gear 7 to rotate through the rotating shaft one 9, and then drives the dosing pipe 4 to rotate through the annular gear 6. During the rotation of the dosing pipe 4, the liquid raw material in the dosing pipe 4 is evenly dispersed and thrown out through the outlet 5 (the outlet 5 is evenly opened on the wall and bottom of the dosing pipe 4). At the same time, start the driving device two 10. The driving device two 10 drives the rotating shaft two 11 to rotate, and then uses the stirring rod 12 to stir the powder raw material in the powder-liquid premixing chamber 1, thereby driving the powder raw material and the liquid raw material to fully contact and mix, forming uniform granular raw materials, and then adding them into the rough mixing chamber 33 through the feeding channel 2, avoiding the problems of powder raw material dusting and large wet lumps caused by the liquid raw material.

[0020] As Figure 3As shown, as another preferred embodiment of the present invention, the powder-liquid premixing assembly further includes a reciprocating scraping assembly, and the reciprocating scraping assembly includes: A magnetic scraping ring 13, installed in the powder-liquid premixing chamber 1 and in contact with the inner wall of the powder-liquid premixing chamber 1; A magnetic control member 14, which attracts the magnetic scraping ring 13, and the magnetic control member 14 is slidably installed in a limit chute 19 opened on the outer wall of the powder-liquid premixing chamber 1; A reciprocating driving assembly, connected between the driving device two 10 and the magnetic control member 14, for driving the magnetic control member 14 to reciprocate up and down.

[0021] To prevent the liquid raw material from splashing on the inner wall of the powder-liquid premixing chamber 1, a reciprocating scraping assembly is also provided, which can drive the liquid raw material to slide down to avoid waste. Start the reciprocating driving assembly to drive the magnetic control member 14 to reciprocate in the limit chute 19, and drive the magnetic scraping ring 13 to reciprocate under the attraction effect of the magnetic control member 14 and the magnetic scraping ring 13, thereby scraping the liquid raw material to slide down.

[0022] As Figure 3 shown, as a preferred embodiment of the present invention, the reciprocating driving assembly includes: A first rotating wheel 15, installed on the output end of the driving device two 10; A second rotating wheel 16, installed on the powder-liquid premixing chamber 1, and a first transmission belt 17 is sleeved between the first rotating wheel 15 and the second rotating wheel 16; A connecting rod 18, one end of the connecting rod 18 is hingedly installed on the edge of the second rotating wheel 16, and the other end of the connecting rod 18 is movably hinged to the magnetic control member 14.

[0023] Start the driving device two 10 to drive the first rotating wheel 15 to rotate. The first rotating wheel 15 drives the second rotating wheel 16 to rotate through the first transmission belt 17. During the rotation of the second rotating wheel 16, the connecting rod 18 is driven to reciprocate in a pushing and pulling process, thereby applying a pushing and pulling force to the magnetic control member 14. Since the limit chute 19 restricts the movement track of the magnetic control member 14, the magnetic control member 14 is restricted to reciprocate up and down.

[0024] As Figure 1 and Figure 2 shown, as a preferred embodiment of the present invention, the multi-purpose driving assembly includes: A third driving device 21, installed on the support frame 20, and the output end of the third driving device 21 is drivingly connected to a third rotating shaft 22 through a coupling; A third rotating wheel 23, fixedly connected to the third rotating shaft 22, and the third rotating wheel 23 is in transmission connection with a fourth rotating wheel 25 through a second transmission belt 24; The workbench plate 26 is fixedly connected to the fourth rotating wheel 25, and the fourth rotating wheel 25 is movably connected to the support frame 20 through a connecting sleeve rod 30; The inner support rod 32 is installed on the support frame 20. The inner support rod 32 is located inside the connecting sleeve rod 30, passes through the fourth rotating wheel 25 and the workbench plate 26, and is fixedly connected with a fixed gear 31; The first self-rotating gear 27 and the second self-rotating gear 28 are respectively movably connected to the workbench plate 26. The first self-rotating gear 27 and the second self-rotating gear 28 are respectively located on both sides of the fixed gear 31 and are continuously meshed with the fixed gear 31. The first self-rotating gear 27 and the second self-rotating gear 28 are connected to the self-rotating stirring assembly.

[0025] Start the third driving device 21. The third driving device 21 drives the third rotating wheel 23 to rotate through the third rotating shaft 22. The third rotating wheel 23 drives the fourth rotating wheel 25 to rotate through the second transmission belt 24, thereby driving the workbench plate 26 to rotate. The inner support rod 32 is located inside the connecting sleeve rod 30 and does not contact the connecting sleeve rod 30, and is connected with a fixed gear 31 after passing through the fourth rotating wheel 25 and the workbench plate 26. The fixed gear 31 is fixed. When the workbench plate 26 rotates, it drives the first self-rotating gear 27 and the second self-rotating gear 28 to revolve. During the rotation process, the first self-rotating gear 27 and the second self-rotating gear 28 are respectively meshed with the fixed gear 31, thereby respectively rotating self, and further driving the self-rotating stirring assembly to rotate self while revolving, so as to fully stir and mix the raw materials in the rough mixing cavity 33.

[0026] As Figures 4 to 5 shown, as a preferred embodiment of the present invention, the self-rotating stirring assembly includes: The stirring rods 29, there are two stirring rods 29, which are respectively fixedly connected to the first self-rotating gear 27 and the second self-rotating gear 28, and the stirring rods 29 are movably connected to the workbench plate 26; The stirring paddles 34 are installed on the stirring rods 29.

[0027] There are two groups of stirring paddles 34, which are respectively installed on the two stirring rods 29. The stirring paddles 34 on each stirring rod 29 can be arranged on different horizontal planes and intersect with each other. The stirring paddles 34 rotate self while stirring and revolve in the rough mixing cavity 33, ensuring full stirring of the raw materials in the rough mixing cavity 33 and improving the mixing effect.

[0028] As Figures 4 to 5 shown, as a preferred embodiment of the present invention, the heat dissipation and scraping component includes: The heat dissipation connecting piece 35, the heat dissipation connecting piece 35 is fixedly connected to the workbench plate 26, and an air outlet 38 is opened on the heat dissipation connecting piece 35; The micro fan 36 is installed on the workbench plate 26, and the air outlet of the micro fan 36 is connected to the heat dissipation connecting part 35; The scraping plate 37 is installed on the heat dissipation connecting part 35, and the scraping plate 37 is in contact with the inner wall of the rough mixing cavity 33.

[0029] When the workbench plate 26 rotates, it drives the heat dissipation connecting part 35 to rotate. At the same time, the micro fan 36 is started. The micro fan 36 conveys cold air into the heat dissipation connecting part 35 and blows it out through the air outlet 38 (since the powder raw material has been premixed, even if there is air flow, it will not cause powder dust). Then, the raw material inside the rough mixing cavity 33 is cooled by air. While the heat dissipation connecting part 35 is rotating, it also drives the scraping plate 37 to scrape on the inner wall of the rough mixing cavity 33, thereby scraping off the raw material adhering to the inside of the rough mixing cavity 33 and improving the mixing effect.

[0030] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mixing device for plastic raw material processing, characterized in that, Comprising: Coarse mixing chamber (33); Powder-liquid premixing chamber (1), installed on a support frame (20), and a feeding channel (2) is provided on the powder-liquid premixing chamber (1) and is matched with the coarse mixing chamber (33); Powder-liquid premixing assembly, installed in the powder-liquid premixing chamber (1) for premixing powder raw materials and liquid raw materials; Heat dissipation type coarse mixing assembly, installed on the support frame (20) and located inside the coarse mixing chamber (33); Wherein, the heat dissipation type coarse mixing assembly includes: Multi-purpose driving assembly, installed on the support frame (20); Self-rotating stirring assembly, connected to the multi-purpose driving assembly, placed inside the coarse mixing chamber (33), and used for revolving while rotating to stir and mix the raw materials; Heat dissipation scraping assembly, connected to the multi-purpose driving assembly, placed inside the coarse mixing chamber (33), and used for scraping the raw materials on the inner wall of the coarse mixing chamber (33) when rotating and air-cooling and dissipating heat from the raw materials.

2. The mixing equipment for plastic raw material processing according to claim 1, characterized in that, The powder-liquid premixing assembly includes: Feeding port (3), installed on the powder-liquid premixing chamber (1); Dosing pipe (4), located inside the powder-liquid premixing chamber (1), a liquid outlet (5) is provided on the dosing pipe (4), and the dosing pipe (4) is movably connected to the feeding port (3); Driving device one (8), installed on the powder-liquid premixing chamber (1), the output end of the driving device one (8) is drivingly connected to a rotating shaft one (9) through a coupling, a driving gear (7) is installed on the rotating shaft one (9), and the driving gear (7) is continuously meshed with an annular gear (6) installed on the dosing pipe (4); Driving device two (10), installed on the outer wall of the powder-liquid premixing chamber (1), the output end of the driving device two (10) is drivingly connected to a rotating shaft two (11) through a coupling, the rotating shaft two (11) is located inside the powder-liquid premixing chamber (1), and a stirring rod (12) is provided on the rotating shaft two (11).

3. The mixing device for plastic raw material processing according to claim 2, characterized in that, The powder-liquid premixing assembly further includes a reciprocating scraping assembly, and the reciprocating scraping assembly includes: Magnetic scraping ring (13), installed inside the powder-liquid premixing chamber (1) and in contact with the inner wall of the powder-liquid premixing chamber (1); Magnetic control part (14), attracting each other with the magnetic scraping ring (13), and the magnetic control part (14) is slidably installed in a limit sliding groove (19) opened on the outer wall of the powder-liquid premixing chamber (1); Reciprocating driving assembly, connected between the driving device two (10) and the magnetic control part (14) for driving the magnetic control part (14) to reciprocate up and down.

4. The mixing device for plastic raw material processing according to claim 3, wherein, The reciprocating driving assembly includes: Rotating wheel one (15), installed on the output end of the driving device two (10); Rotating wheel two (16), installed on the powder-liquid premixing chamber (1), and a transmission belt one (17) is sleeved between the rotating wheel one (15) and the rotating wheel two (16); Connecting rod (18), one end of the connecting rod (18) is hingedly installed on the edge of the rotating wheel two (16), and the other end of the connecting rod (18) is movably hinged to the magnetic control part (14).

5. The mixing device for plastic raw material processing according to claim 1, characterized in that, The multi-purpose driving assembly includes: The third driving device (21) is installed on the support frame (20), and the output end of the third driving device (21) is drivingly connected to the third rotating shaft (22) through a coupling; The third rotating wheel (23) is fixedly connected to the third rotating shaft (22), and the third rotating wheel (23) is drivingly connected to the fourth rotating wheel (25) through the second transmission belt (24); The workbench plate (26) is fixedly connected to the fourth rotating wheel (25), and the fourth rotating wheel (25) is movably connected to the support frame (20) through the connecting sleeve rod (30); The inner support rod (32) is installed on the support frame (20), the inner support rod (32) is located inside the connecting sleeve rod (30), passes through the fourth rotating wheel (25) and the workbench plate (26), and is fixedly connected with a fixed gear (31); The first self-rotating gear (27) and the second self-rotating gear (28) are respectively movably connected to the workbench plate (26), the first self-rotating gear (27) and the second self-rotating gear (28) are respectively located on both sides of the fixed gear (31) and are continuously meshed with the fixed gear (31), and the first self-rotating gear (27) and the second self-rotating gear (28) are connected to the self-rotating stirring assembly.

6. The mixing device for plastic raw material processing according to claim 5, characterized in that, The self-rotating stirring assembly includes: The stirring rod (29), there are two stirring rods (29), which are respectively fixedly connected to the first self-rotating gear (27) and the second self-rotating gear (28), and the stirring rod (29) is movably connected to the workbench plate (26); The stirring paddle (34) is installed on the stirring rod (29).

7. The mixing equipment for plastic raw material processing according to claim 6, characterized in that, The heat dissipation and scraping assembly includes: The heat dissipation connecting piece (35) is fixedly connected to the workbench plate (26), and an air outlet (38) is formed on the heat dissipation connecting piece (35); The micro fan (36) is installed on the workbench plate (26), and the air outlet of the micro fan (36) is connected to the heat dissipation connecting piece (35); The scraping plate (37) is installed on the heat dissipation connecting piece (35), and the scraping plate (37) is in contact with the inner wall of the rough mixing chamber (33).

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