Efficient pelletizing spiral extrusion molding system for polymer particle production

Abstract

The invention discloses an efficient grain-sized dicing spiral extrusion molding system for polymer particle production, which comprises an extrusion molding device and a grain-sized dicing device, the extrusion molding device comprises a machine barrel, a screw positioned in the machine barrel, a screw driving unit for driving the screw to rotate and a die head mounted at the end part of the machine barrel, and the die head is provided with a plurality of extrusion holes; the pelletizing device comprises a mounting frame, a surrounding shell mounted on the mounting frame, a rotating part connected with the surrounding shell through a first bearing, a rotating part driving unit for driving the rotating part to rotate and two cutting units mounted on the rotating part; and the die head is inserted into the surrounding shell. According to the extrusion molding system, each cutting unit can use two cutters to alternately carry out pelletizing, and the cutters which do not carry out pelletizing can be cleaned by hot air, so that materials at the cutting edges can be cleaned away, pelletizing can be carried out for a long time, and the pelletizing effect cannot be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spiral extrusion system, and more particularly, to a high-efficiency pelletizing spiral extrusion system for polymer particle production. BACKGROUND

[0002] In the fields of plastic product production, recycling processing and polymer particle preparation, extrusion system plays a crucial role. The extrusion device extrudes the polymer material in molten state through a specific die into a continuous strip or filament, and then cuts it into uniform particles by a pelletizing device for subsequent processing and use.

[0003] The existing pelletizing device will have molten material adhered to the cutting edge of the cutter after cutting, which will affect the pelletizing effect. With the continuation of the pelletizing process, these molten materials adhered to the cutting edge will gradually cool and solidify, forming a thin layer of semi-solid residue, which not only reduces the sharpness of the cutter, causing rough edges and uneven particle size during cutting, but also generates more dust and debris during the pelletizing process due to repeated adhesion and peeling of the material, affecting the purity of the product. In addition, if not cleaned in time, the adhered material may generate friction when the cutter rotates, accelerating the wear of the cutter, shortening its service life, and also increasing the noise and energy consumption during equipment operation, reducing production efficiency. Therefore, during the operation of the pelletizing device, regular cleaning of the cutter is necessary to ensure the cleanliness of the cutting edge and maintain stable pelletizing quality and extend the service life of the equipment. SUMMARY

[0004] The present application aims to overcome the defects of the prior art and provide a high-efficiency pelletizing spiral extrusion system for polymer particle production.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a spiral extrusion system comprising an extrusion device and a pelletizing device, the extrusion device comprising a barrel, a screw located in the barrel, a screw drive unit for driving the screw to rotate, and a die head mounted at the end of the barrel, the die head having a plurality of extrusion holes; the pelletizing device comprising a mounting bracket, a surrounding shell mounted on the mounting bracket, a rotating part connected to the surrounding shell through a first bearing, a rotating part drive unit for driving the rotating part to rotate, and two cutting units mounted on the rotating part; the die head is inserted into the surrounding shell.

[0006] Further, the screw drive unit comprises a motor and a reduction box.

[0007] Further, the rotating part comprises a rotating block, a rotating column fixedly connected with the rotating block, and two installation columns fixedly connected with the rotating block, the rotating part has a cylindrical first channel, the installation columns have second channels communicated with the first channel and perforations communicated with the second channels, each installation column is connected with two blowing units, the blowing unit comprises a connecting pipe communicated with the second channel, an air outlet fixedly connected with the rotating block and communicated with the connecting pipe, and a nozzle mounted on the air outlet; the cutting unit comprises a rotating cylinder mounted on the installation column and capable of rotating relative to the installation column, a rotating rod communicated with the rotating cylinder and penetrating the perforation, a rotating plate fixedly connected with the end of the rotating rod, and two cutters fixedly connected with the rotating cylinder; the mounting frame is provided with an electric push rod, the electric push rod drives a translation pipe, the translation pipe is connected with a sliding seat through a first radial plate, the first channel is connected with an installation pipe through a second bearing, the installation pipe has a strip-shaped sliding groove matched with the sliding seat, the translation pipe is connected with a movable rod through a third bearing, the translation pipe is connected with a hot air generating unit through an air inlet pipe, the translation pipe is provided with a plurality of communication holes communicated between the space in the translation pipe and the space in the installation pipe, the movable rod is connected with a hinged block, each rotating plate is connected with the hinged block through a hinged rod, one end of the hinged rod is hinged with the rotating plate, and the other end is hinged with the hinged block.

[0008] Further, the hot air generating unit comprises a fan and a heating unit.

[0009] Further, the first channel is connected with a limiting pipe through a plurality of second radial plates, the limiting pipe has a limiting channel with a hexagonal cross section, and the movable rod is fixedly provided with a plurality of surrounding protrusions, the plurality of surrounding protrusions are located in the limiting channel and have a hexagonal cross section.

[0010] Therefore, the plurality of surrounding protrusions are matched with the limiting channel, so that the movable rod and the rotating column rotate synchronously.

[0011] Further, during the cutting, one cutter of each cutting unit abuts against the die, and the other cutter faces one nozzle; the electric push rod can be at a first length and a second length, when the electric push rod is at the first length and the second length, one cutter of each cutting unit abuts against the die, and the other cutter faces one nozzle, and when the electric push rod is at the first length and the second length, the cutter of the cutting unit abutting against the die is different.

[0012] Therefore, during the cutting process, by switching the electric push rod between the first length and the second length, the two cutters can be alternately used for cutting operation.

[0013] Further, when the electric push rod is switched from the first length to the second length, the two rotating plates rotate by an equal angle, and each rotates by 60-80 degrees.

[0014] Further, the cutting device can be in a first pelletizing state and a second pelletizing state, in the first pelletizing state, the electric push rod is in a first length, and the rotating part rotates in a first direction; in the second pelletizing state, the electric push rod is in a second length, and the rotating part rotates in a second direction; the first length is greater than the second length, and the first direction and the second direction are opposite.

[0015] Further, when the electric push rod is switched from the first length to the second length, both rotating plates rotate by 80 degrees.

[0016] Further, the included angle between the axes of the two connecting pipes on the same side of the rotating block is between 80-120 degrees.

[0017] Further, the first radial plate has multiple and is equally spaced annularly distributed, and the strip-shaped sliding groove has multiple and is equally spaced annularly distributed, and the number of the sliding seat and the strip-shaped sliding groove is equal and one-to-one corresponding.

[0018] Therefore, the cooperation of the sliding seat and the strip-shaped sliding groove ensures the stability of the translation pipe during movement, and improves the quality of the pelletizing.

[0019] Further, the number of the first radial plate and the strip-shaped sliding groove is four.

[0020] Further, the translation pipe is fixed with a circular ring-shaped shielding cover.

[0021] Therefore, the shielding cover can shield the hot purge gas flow, which will not blow to the mounting frame.

[0022] Further, the plurality of extrusion holes are divided into multiple concentric circles, and the extrusion holes in each circle are annularly and equally spaced.

[0023] Further, the extrusion device further comprises a feeding hopper, a vacuum exhaust unit and a heating and cooling unit.

[0024] Therefore, the heating and cooling unit can heat or cool the cylinder.

[0025] Further, the mounting column has a circular ring-shaped sliding groove, the rotating cylinder includes a circular ring-shaped cylinder body, a sliding block fixed to the cylinder body and cooperating with the circular ring-shaped sliding groove, and an end plate connected to the cylinder body through a plurality of radial rods, and the end plate is connected with the rotating rod.

[0026] Therefore, the cooperation of the circular ring-shaped sliding groove and the sliding block makes the rotation of the rotating cylinder on the mounting column more stable and smooth.

[0027] Further, the sliding block is an arc-shaped sliding block or a circular ring-shaped sliding block.

[0028] Further, the radial rod has four, and the end plate is a circular plate.

[0029] Further, the nozzle is a U-shaped nozzle, and the air outlet part has an inner cavity in communication with the connecting pipe and the nozzle.

[0030] Further, the surrounding shell comprises a first circular ring plate, a second circular ring plate, a circumferential plate connecting the first circular ring plate and the second circular ring plate, and a plurality of connecting rods connecting the mounting frame and the circumferential plate, and the circumferential plate is provided with a discharge pipe.

[0031] Further, the rotating part driving unit comprises a driven wheel mounted on the rotating column, a motor mounted on the mounting frame, a driving wheel driven by the motor, and a synchronous belt connecting the driving wheel and the driven wheel.

[0032] In some embodiments, the motor drives by a driving gear, and the rotating column is provided with a gear ring engaged with the driving gear, instead of using the driving wheel, the driven wheel and the synchronous belt.

[0033] Further, the circumferential plate is provided with a plurality of cooling liquid nozzles, and the plurality of cooling liquid nozzles are connected with a cooling liquid supply unit.

[0034] Therefore, the cooling liquid nozzles can spray cooling liquid, so that the cut particles can be rapidly cooled.

[0035] Further, a rack is further provided, and the rack is connected with the mounting frame through a translation driving unit.

[0036] Therefore, the mounting frame can be driven to translate by the translation driving unit, so that the mounting frame can be away from the die head, so that the die head can be exposed from the surrounding shell, thereby facilitating the cleaning and maintenance of the die head and the cutting device.

[0037] Further, the translation driving unit is an electric push rod.

[0038] Further, the rack is provided with a guide rod, and the mounting frame is provided with a guide hole matched with the guide rod.

[0039] In some embodiments, the rack is provided with a guide rail, and the mounting frame is provided with a guide rail groove matched with the guide rail.

[0040] Therefore, the mounting frame can be stably moved during translation.

[0041] Beneficial effects: the extrusion system of the present application can use two cutting knives to alternately cut particles, and the cutting knife not cutting particles can be cleaned by hot air, so that the material at the cutting edge can be cleaned, thereby long-term cutting particles without reducing the cutting effect. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 a schematic view of an extrusion system;

[0043] Figure 2 Enlarged view of area A;

[0044] Figure 3 Schematic view of the electric push rod in a first length;

[0045] Figure 4 Enlarged view of area B;

[0046] Figure 5 Schematic view of the electric push rod in a second length;

[0047] Figure 6 Enlarged view of area C;

[0048] Figure 7 Schematic view of the parts separated;

[0049] Figure 8 Enlarged view of area D;

[0050] Figure 9 Enlarged view of area E;

[0051] Figure 10 Schematic view of another perspective of Figure 7 ;

[0052] Figure 11 Enlarged view of area F;

[0053] Figure 12 Schematic view of a cross section of the rotating part of the extrusion system;

[0054] Figure 13 Enlarged view of area G;

[0055] Figure 14 Schematic view of another perspective of Figure 12 ;

[0056] Figure 15 Enlarged view of area H;

[0057] Figure 16 Enlarged view of area I;

[0058] For the sake of clarity, Figures 1-10 the rotating column has been partially cut in

[0059] Explanation of reference signs: barrel 1; screw driving unit 1.1; die 1.2; extrusion hole 1.2.1; feeding hopper 1.3; mounting frame 2; electric push rod 2.1; surrounding shell 3; first circular ring plate 3.1; second circular ring plate 3.2; first bearing 3.2.1; circumferential plate 3.3; connecting rod 3.4; discharge pipe 3.5; rotating block 4.1; rotating column 4.2; mounting column 4.3; circular ring-shaped chute 4.3.1; first channel 4.4; second bearing 4.4.1; second channel 4.5; perforation 4.6; second radial plate 4.7; limiting pipe 4.8; connecting pipe 5.1; air outlet part 5.2; nozzle 5.3; rotating cylinder 6.1; cylinder body 6.1.1; sliding block 6.1.2; radial rod 6.1.3; end plate 6.1.4; rotating rod 6.2; rotating plate 6.3; cutter 6.4; translation pipe 7; first radial plate 7.1; sliding seat 7.2; third bearing 7.3; movable rod 7.4; surrounding protrusion 7.4.1; air inlet pipe 7.5; communication hole 7.6; hinged block 7.7; hinged rod 7.8; shielding cover 7.9; mounting pipe 8; strip-shaped chute 8.1; passive wheel 9.1; motor 9.2; driving wheel 9.3; synchronous belt 9.4. DETAILED DESCRIPTION

[0060] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein like or similar elements are denoted by the same or similar reference signs throughout the drawings. The embodiments described below are exemplary, and are intended to explain the present application, and are not to be understood as limiting the present application.

[0061] The application provides a high-efficiency pelletizing screw extrusion system for high-molecular particle production, which is shown in the figure and comprises an extrusion device and a pelletizing device. The extrusion device comprises a cylinder, a screw located in the cylinder, a screw driving unit for driving the screw to rotate, and a die head 1.2 installed at the end of the cylinder, wherein the die head 1.2 is provided with a plurality of extrusion holes 1.2.1. The pelletizing device comprises a mounting frame 2, a surrounding shell 3 installed on the mounting frame 2, a rotating part connected with the surrounding shell 3 through a first bearing 3.2.1, a rotating part driving unit for driving the rotating part to rotate, and two cutting units installed on the rotating part. The die head 1.2 is inserted into the surrounding shell 3. The rotating part comprises a rotating block 4.1, a rotating column 4.2 fixedly connected with the rotating block 4.1, and two mounting columns 4.3 fixedly connected with the rotating block 4.1. The rotating part is provided with a cylindrical first channel 4.4. The mounting column 4.3 is provided with a second channel 4.5 communicated with the first channel 4.4 and a through hole 4.6 communicated with the second channel 4.5. Each mounting column 4.3 is connected with two blowing units. The blowing unit comprises a connecting pipe 5.1 communicated with the second channel 4.5, an air outlet part 5.2 fixedly connected with the rotating block 4.1 and communicated with the connecting pipe 5.1, and a nozzle 5.3 installed on the air outlet part 5.2. The cutting unit comprises a rotating cylinder 6.1 installed on the mounting column 4.3 and capable of rotating relative to the mounting column 4.3, a rotating rod 6.2 connected with the rotating cylinder 6.1 and penetrating through the through hole 4.6, a rotating plate 6.3 fixedly connected with the end of the rotating rod 6.2, and two cutting knives 6.4 fixedly connected with the rotating cylinder 6.1. An electric push rod 2.1 is installed at the mounting frame 2. The electric push rod 2.1 drives a translation pipe 7. The translation pipe 7 is connected with a sliding seat 7.2 through a first radial plate 7.1. The first channel 4.4 is connected with a mounting pipe 8 through a second bearing 4.4.1. The mounting pipe 8 is provided with a strip-shaped sliding groove 8.1 matched with the sliding seat 7.2. The translation pipe 7 is connected with a movable rod 7.4 through a third bearing 7.3. The translation pipe 7 is connected with a hot air generating unit through an air inlet pipe 7.5. The translation pipe 7 is provided with a plurality of communication holes 7.6 communicated with the space in the translation pipe 7 and the space in the mounting pipe 8. The movable rod 7.4 is connected with a hinged block 7.7. Each rotating plate 6.3 is connected with the hinged block 7.7 through a hinged rod 7.8. One end of the hinged rod 7.8 is hinged with the rotating plate 6.3, and the other end is hinged with the hinged block 7.7. The hot air generating unit comprises a fan and a heating unit. The first channel 4.4 is connected with a limiting pipe 4.8 through a plurality of second radial plates 4.7. The limiting pipe 4.8 is provided with a limiting channel with a hexagonal cross section. The movable rod 7.4 is fixedly provided with a plurality of surrounding protrusions 7.4.1, which are located in the limiting channel and have a hexagonal cross section.When the cutting unit is in abutment with the die, one of the two cutters 6.4 of each cutting unit is in abutment with the die 1.2, and the other cutter 6.4 faces one of the nozzles 5.3; the electric push rod 2.1 can be in a first length and a second length, when the electric push rod 2.1 is in the first length and the second length, one of the two cutters 6.4 of each cutting unit is in abutment with the die 1.2, and the other cutter 6.4 faces one of the nozzles 5.3, and when the electric push rod 2.1 is in the first length and the second length, the cutters of the cutting unit in abutment with the die 1.2 are different cutters; when the electric push rod 2.1 switches from the first length to the second length, the two rotating plates 6.3 rotate by an equal angle, and the angle is 60-80 degrees.

[0062] The included angle between the axes of the two connecting pipes 5.1 on the same side of the rotating block 4.1 is between 80-120 degrees. The first radial plate 7.1 has multiple and equally spaced annular distributions, and the strip-shaped sliding groove 8.1 has multiple and equally spaced annular distributions. The number of the sliding seat 7.2 and the strip-shaped sliding groove 8.1 is equal and one-to-one corresponding. The translation pipe 7 is fixed with a circular ring-shaped shielding cover 7.9; a plurality of extrusion holes 1.2.1 are divided into multiple concentric circles, and each circle of extrusion holes 1.2.1 is annularly and equally spaced; the extrusion device further comprises a feeding hopper 1.3, a vacuum exhaust unit and a heating and cooling unit. The mounting column 4.3 has a circular ring-shaped sliding groove 4.3.1, the rotating cylinder 6.1 includes a circular ring-shaped cylinder body 6.1.1, a sliding block 6.1.2 fixed to the cylinder body 6.1.1 and matched with the circular ring-shaped sliding groove 4.3.1, and an end plate 6.1.4 connected with the cylinder body 6.1.1 through a plurality of radial rods 6.1.3, the end plate 6.1.4 is connected with the rotating rod 6.2. The nozzle 5.3 is a U-shaped nozzle, and the air outlet 5.2 has an inner cavity in communication with the connecting pipe 5.1 and the nozzle 5.3. The surrounding shell 3 includes a first circular ring plate 3.1, a second circular ring plate 3.2, a circumferential plate 3.3 connecting the first circular ring plate 3.1 and the second circular ring plate 3.2, and a plurality of connecting rods 3.4 connecting the mounting frame 2 and the circumferential plate 3.3, and the circumferential plate 3.3 is connected with the discharge pipe 3.5; the rotating part driving unit includes a driven wheel 9.1 mounted on the rotating column 4.2, a motor 9.2 mounted on the mounting frame 2, a driving wheel 9.3 driven by the motor 9.2, and a synchronous belt 9.4 connecting the driving wheel 9.3 and the driven wheel 9.1.

[0063] Working principle: the extrusion device of the application, the material can be extruded from the extrusion hole of the die, and under the driving of the motor, the rotating part will rotate, so that the rotating column rotates, and due to the connecting structure of the articulated rod and the limiting of the limiting tube, the movable rod rotates synchronously with the rotating column, and due to the action of the second bearing and the third bearing, the translation tube and the mounting tube can keep not rotating. And under the driving of the electric push rod, the translation tube can translate, so that the movable rod and the articulated block can rotate and translate at the same time, and the two articulated rods articulated with the articulated block can drive the two rotating plates to rotate, so that the cutter abutting the die can be switched (the cutter facing the nozzle abuts the die before, and the cutter facing the nozzle abuts the die before), and at this time the motor reverses, so that the rotating direction of the rotating part is opposite (the purpose is to match the angle of the new cutter abutting the die), and since the cleaned cutter is used for cutting at this time, the cutting quality is higher. And the cutter before facing the nozzle, under the blowing of the high-temperature high-speed airflow of the nozzle, the material adhered to the cutting edge will be melted and blown away (the cleaning operation can be continued for a period of time, and it is not necessary to continuously clean during cutting). During the length change of the electric push rod, the electric switch rotates in the opposite direction, so that when the rotating part changes the rotating direction, all the cutters do not abut the die, so that the change of the rotating direction of the rotating part is more undisturbed, and the influence on the cutter is smaller. During the switching process, the die can continuously extrude, at this time the extruded material will form a long strip due to the lack of timely cutting, and the material slag generated by the cutter cleaning will be mixed in the particles, which can be screened in the subsequent cooling and screening. So that the cutters of each cutting unit can alternate cutting and cleaning, so that the cutters can always keep good state for cutting, so as to ensure the quality of cutting.

[0064] Although the application is illustrated and described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the application as defined by the claims.

Claims

1. A high-efficiency pelletizing spiral extrusion system for polymer particle production, characterized in that, The device includes an extrusion unit and a pelletizing unit. The extrusion unit includes a barrel, a screw located inside the barrel, a screw drive unit for driving the screw to rotate, and a die head mounted at the end of the barrel. The die head has multiple extrusion holes. The pelletizing unit includes a mounting frame, a surrounding shell mounted on the mounting frame, a rotating part connected to the surrounding shell via a first bearing, a rotating part drive unit for driving the rotating part to rotate, and two cutting units mounted on the rotating part. The die head is inserted into the surrounding shell.

2. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 1, characterized in that, The rotating part includes a rotating block, a rotating column fixedly connected to the rotating block, and two mounting columns fixedly connected to the rotating block. The rotating part has a cylindrical first channel, and the mounting columns have a second channel communicating with the first channel and a through hole communicating with the second channel. Each mounting column is connected to two purging units. The purging unit includes a connecting pipe communicating with the second channel, an air outlet fixedly connected to the rotating block and communicating with the connecting pipe, and a nozzle installed on the air outlet. The cutting unit includes a rotating cylinder mounted on the mounting column and capable of rotating relative to the mounting column, a rotating rod connected to the rotating cylinder and passing through the through hole, a rotating plate fixed to the end of the rotating rod, and two... A cutter is fixedly connected to the rotating cylinder; an electric push rod is installed at the mounting bracket, the electric push rod drives a translation tube, the translation tube is connected to a slide block through a first radial plate, the first channel is connected to an installation tube through a second bearing, the installation tube has a strip-shaped groove that mates with the slide block, the translation tube is connected to a movable rod through a third bearing, the translation tube is connected to a hot air generating unit through an air inlet pipe, the translation tube has multiple connecting holes that connect the inner space of the translation tube and the inner space of the installation tube, the movable rod is connected to a hinge block, each rotating plate is connected to the hinge block through a hinge rod, one end of the hinge rod is hinged to the rotating plate, and the other end is hinged to the hinge block.

3. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, The first channel is connected to a limiting tube through multiple second radial plates. The limiting tube has a limiting channel with a regular hexagonal cross-section. Multiple surrounding protrusions are fixed at the movable rod. All the surrounding protrusions are located inside the limiting channel and have a regular hexagonal cross-section.

4. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, During pelletizing, one cutter of each cutting unit abuts against the die head, and the other cutter faces one of the nozzles; the electric push rod can be in a first length and a second length. When the electric push rod is in the first length and the second length, one cutter of each cutting unit abuts against the die head, and the other cutter faces one of the nozzles. When the electric push rod is in the first length and the second length, the cutter of the cutting unit abutting against the die head is a different cutter; when the electric push rod switches from the first length to the second length, the two rotating plates rotate at equal angles, both rotating 60-80 degrees.

5. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, The included angle between the axes of the two connecting pipes on the same side of the rotating block is between 80 and 120 degrees.

6. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, The first radial plate has multiple segments that are evenly spaced in a ring, and the strip grooves have multiple segments that are evenly spaced in a ring. The number of slide blocks and strip grooves are equal and they correspond one-to-one.

7. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, A circular shield is fixed at the translation tube; multiple extrusion holes are divided into multiple concentric rings, with the extrusion holes in each ring being equally spaced in a ring shape; the extrusion device also includes a feeding hopper, a vacuum exhaust unit, and a heating and cooling unit.

8. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, The mounting post has an annular groove, and the rotating cylinder includes an annular cylindrical body, a slider fixed to the cylindrical body and cooperating with the annular groove, and an end plate connected to the cylindrical body through multiple radial rods. The end plate is connected to the rotating rod.

9. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, The nozzle is a U-shaped nozzle, and the air outlet has an inner cavity that communicates with both the connecting pipe and the nozzle.

10. The high-efficiency pelletizing spiral extrusion system for polymer particle production according to claim 2, characterized in that, The enclosure includes a first annular plate, a second annular plate, a circumferential plate connecting the first and second annular plates, and multiple connecting rods connecting the mounting brackets and the circumferential plates. A discharge pipe is connected to the circumferential plate. The rotating part drive unit includes a driven wheel mounted on the rotating column, a motor mounted on the mounting bracket, a driving wheel driven by the motor, and a synchronous belt connecting the driving wheel and the driven wheel.

Images