WO2022166078A1 - Feedstock melting mechanism of pelletizer - Google Patents

Abstract

Disclosed in the present invention is a feedstock melting mechanism of a pelletizer. The pelletizer comprises a sleeve, a transmission motor, a reduction gearbox, a screw and a filter; the transmission motor is connected to the reduction gearbox, a pellet outlet plate is fixed to a cyclone cover, and two ends of the sleeve are respectively fixed to the pellet outlet plate and the reduction gearbox; the screw is provided inside the sleeve, a horn scraper is mounted on the screw, and bearings are provided at connection positions between two ends of the screw and the reduction gearbox and the pellet outlet plate; and the screw is provided with a flight, the flight is arranged in a spiral shape, and material accommodation cavities of different sizes are formed between the flight and the sleeve. In the present invention, by means of a spiral feeding structure, the material is melted in an extrusion and pressurization manner, and the molten material is further extruded and filtered by means of a filter, so as to complete pelletizing finally.

Description

A feed melting mechanism of a granulator technical field

The invention belongs to the field of granulation, and in particular relates to a feed melting mechanism of a granulator.

Background technique

Screw granulator generally includes plastic granulator, single and twin screw plastic extruder, plastic film blowing machine, bag making machine, printing machine, coating machine, tape machine, tape slitting machine, slitting machine, packing belt machine . The modified formula is dominated by alloy materials, especially PET, PC, ABS, (PP, PA) materials that are currently growing in application areas; Rotate freely across the die face without restricting the water flow temperature. The molten polymer is extruded from the die, and the pellets are cut by the rotary knife, and the pellets are carried out of the pelletizing chamber by the temperature-regulated water and enter the centrifugal dryer.

At the same time, the heating part of the existing granulator is mostly energy-saving by using electromagnetic heaters. Although the energy-saving rate is about 30%-70% of the old resistance coil, it still needs to consume a lot of energy during the working process. The expansion of energy saving has become an important indicator for realizing green production.

technical problem

In the prior art, Chinese patent CN101905543B discloses a screw extrusion heating straw compression molding process and equipment, but although this equipment adopts screw pressure for extrusion, it still needs heating oil for auxiliary heat transfer, which requires auxiliary heat transfer. Temperature control is not conducive to energy saving; Chinese patent CN108705756A discloses an extrusion screw, because the diameter of the rod body gradually becomes smaller and the distance between the screw ribs and the width of the screw ribs on each section are not the same, so in the feeding section and the melting section. Between the melting section and the homogenizing section, a transition section and a transition section are respectively set to reduce the occurrence of uneven extrusion of materials caused by changes in the width of the screw ribs and the distance between the screw ribs, and a rubber extruder disclosed in Chinese patent CN203600581U , The extrusion process is divided into six stages to improve production efficiency and improve product quality by setting the screw with different pitches on the screw, but these improvements to the screw still have low melting efficiency between different stages, which cannot make the material fully melting problem.

During the extrusion process, the material will change with the pressure and temperature. When the extrusion section changes greatly, it will affect the granulation of the molten material. The space of the screw extrusion will affect the melting process of the material. It is necessary to set a suitable extrusion section for extrusion. Therefore, it is necessary to develop a feeding and melting mechanism of the granulator to solve the problems encountered at present.

technical solutions

A feed melting mechanism of a pelletizer comprises a sleeve and a screw which is arranged inside the sleeve and is driven by a power device.

One end of the sleeve is provided with a feeding port, and a threaded groove is arranged inside the sleeve; the screw is provided with a screw rib, and the screw rib cooperates with the threaded groove on the sleeve to form a material container with a certain airtightness In the material holding cavity, the screw extrudes and pressurizes the material through the gradual change of the bottom diameter and the outer diameter of the screw to realize the melting of the material; one end of the screw is the screw motor shaft connected to the motor.

The screw is divided into a feeding section, a melting section, a banburying section and a homogenizing section from the feeding port of the sleeve to the distal direction. The feeding section and the melting section are used to gradually pressurize the material. For melting, the banburying section is used to further pressurize the material passing through the feeding section and the melting section, and the homogenization section is used to depressurize the material passing through the banburying section and then gradually pressurize and mix evenly.

In a specific embodiment of the feeding and melting mechanism of the present invention, the feeding section and the melting section form a double-ended helix from the feeding port of the sleeve to the distal direction, and the bottom diameter of the feeding section is The bottom diameter of the melting section gradually increases along the feeding port to the distal direction, and the screw of the banburying section is of equal diameter and has a ring screw circumferential direction on the screw. Double rows of spaced slanted serrated protrusions. The serrated protrusions between the rows form a channel inclined to the horizontal axis for the passage of molten material at a certain angle. diameter gradually increases.

In a specific embodiment of the feeding melting mechanism of the present invention, the ratio of the screw diameter of the end of the feeding section close to the feeding port to the screw diameter of the end of the melting section far from the feeding port is 1:1.5~2. The ratio of the screw diameter of the end of the homogenization section close to the feed port to the screw diameter of the end of the homogenization section away from the feed port is 1:1.2~1.8, and the screw diameter of the end of the homogenization section close to the feed port is larger than that of the feeding section The screw diameter is smaller than the screw diameter of the end of the melting section away from the feed port.

In a specific embodiment of the feed melting mechanism of the present invention, the axial length ratio of the melting section to the feeding section is 1:1 to 2, and the axial length ratio of the melting section to the homogenization section is 1: 0.8~1.2, the length of the banburying section is 1/8~1/4 of the axial length of the feeding section.

Further, the banburying section is at least one section; when the banburying section is one section, the banburying section is arranged between the melting section and the homogenization section; when the banburying section exceeds one section, the banburying sections are It is arranged between the melting section and the homogenizing section, or is respectively arranged between the melting section and the melting section and the homogenizing section.

In a specific embodiment of the feeding melting mechanism of the present invention, the pitch ratio of the adjacent helixes of the feeding section and the melting section is 1:0.8~1.2, and the pitches of the adjacent helixes of the melting section and the homogenizing section are 1:0.8~1.2. The ratio is 1:0.8~1.3, and the angle between the inclined channel of the mixing section and the horizontal axis is 25~35°.

In a specific embodiment of the feed melting mechanism of the present invention, a vent hole is provided in the middle of the sleeve near the side of the homogenization structure.

The present invention also discloses a granulator, comprising the aforementioned feed melting mechanism.

beneficial effect

Due to the adoption of the above technical solution, the beneficial effects of the present invention are: the present invention makes the feeding of the granulator convenient through the design of the special structure of the screw, and realizes the effect of low-temperature melting through the height setting of the screw, which is beneficial to To save energy, the screw extrusion adopts multi-stage co-extrusion method, and uses gradual extrusion to realize the temperature rise of the material and realize the uniformity of material melting. The internal mixing section not only changes the shearing force of the material, but also changes the shearing force. The direction of the raw material composition specification is further optimized and uniform, resulting in an ideal structure, which has a mixing effect of distribution and dispersion; the homogenization section conveys and pressurizes the material, so that the raw material at the die mouth has a certain relative density, and promotes Mix further.

At the same time, the filter matched with the screw can be used for auxiliary extrusion and melting. The horn scraper rotates counterclockwise against the screen plate. Under the action of extrusion pressure and the scraping pressure of the horn, the normal material is squeezed through the screen plate, which not only conveys the material , it can further extrude and melt the incompletely molten material, and separate the impurities in the material from the molten material, relying on the melting point of the impurities and the molten material to separate, the impurities will stay on the screen, and the molten material will be further squeezed. The stencil is passed through the screen during the pressing, and then the granules are discharged through the granulating flange, and the horns are rotated to scrape away the impurities, bring them to the gap in the porous flange, and send them to the impurity discharge hole.

At the same time, after the molten material extruded by the horn scraper passes through the densely porous mesh plate, the material is accumulated under the drainage of the diversion cone, which is conducive to the further mixing of the material on the one hand, and reduces the insufficient mixing of the molten material on the other hand. Extrusion granulation increases the density of the molten material to increase the particle strength, and prevents the separation of impurities from blocking the mesh opening of the material during the extrusion granulation process and thus affecting the continuous granulation. Compared with direct extrusion and granulation through horn scraping, the diversion cone and the pelletizing flange are better than direct extrusion in maintaining the mixing density and anti-blocking performance of the material before extrusion; It is easier to use the fluidity characteristics of the molten material by setting the filter diversion in the rear section, and it can also reduce the shortage of material accumulation space in the screw conveying section, which leads to low material conveying efficiency and material blocking.

Under the pressure of the conveyed material, the molten material passes through the pelletizing flange, and after being extruded through the extrusion hole of the pelletizing plate, the pelletizing is completed under the action of the cutter; The distribution is convenient for the pressure release after the first half of the screw is pressurized, and at the same time, the granulation is more convenient.

Description of drawings

Fig. 1 is a schematic diagram of the feed melting structure of the present invention.

Figure 2 is a schematic structural diagram of the screw of the present invention.

FIG. 3 is a schematic diagram of the cross-sectional structure of the feed melting of the present invention.

4 is a schematic diagram of the horn scraper of the present invention.

FIG. 5 is a schematic view of the structure of the multi-stage internal mixing section of the screw of the present invention.

FIG. 6 is a schematic structural diagram of the filter of the present invention.

FIG. 7 is a schematic diagram of the overall structure of the granulator including the filter according to the present invention.

Figure 8 is a schematic diagram of the internal structure of the granulator.

Figure 9 is a schematic diagram of the installation of the partition plate of the granulator.

Figure 10 is a schematic diagram of the installation of the jet pipe of the granulator.

Figure 11 is a schematic diagram of the installation of the sleeve of the granulator.

Among them, 1. Cyclone cover, 2. Sleeve, 3. Transmission motor, 4. Gear box, 5. Cutter motor, 6. Air inlet connector, 7. Outlet connector, 8. Exhaust hole, 9. Feeding port, 10. Separator, 11. Pelletizing plate, 12. Screw, 13. Screw edge, 14. Material chamber, 15. Feeding section, 16. Melting section, 17. Air outlet, 18. Cutter seat , 19. Cutter, 20. Motor shaft, 201, Screw motor shaft, 21. Air jet pipe, 22. Homogenizing section, 23. Material tank, 24. Material total inlet, 25. Wind selection mechanism, 26. Through hole , 27 thread grooves, 28 banburying section, 2811 first banburying section, 2812 second banburying section, 31 porous flange, 32 mesh plate, 33 horn scraper, 34 graining flange, 35 guide cone, 36 go Miscellaneous notch, 37 Impurity discharge pipe, 38 Impurity discharge flange, 39 Rotary handle.

Best Mode for Carrying Out the Invention

Example 1.

Referring to FIGS. 1 to 5, a feed melting mechanism of a pelletizer includes a sleeve 2 and a screw 12. The screw 12 is arranged inside the sleeve 2, and the screw 12 is provided with screw ribs. 13. One end of the sleeve 2 is provided with a feed port 9 .

A material containing cavity 14 with a certain space is formed between the screw rib 13 and the sleeve 2. The material containing cavity 14 squeezes and pressurizes the material through the screw 12 at the bottom of the spiral to realize the melting of the material; one end of the sleeve 2 is provided with an inlet. Material port 9, from one end of the feed port 9 to the middle of the screw 12, the volume of the material holding cavity 14 formed between the screw rib 13 and the sleeve 2 varies in size. The thread groove 27 in a certain airtight space is used to extrude, pressurize and melt the material in the material holding cavity 14 with different volumes through the screw 12; one end of the screw 12 is the screw motor shaft 201 connected to the motor.

The screw 12 includes a feeding section 15 , a melting section 16 , an internal mixing section 28 and a homogenizing section 22 .

The feeding section 15 and the melting section 16 form a double-ended helix from the feeding port of the sleeve to the distal direction, and the bottom diameter of the feeding section 15 is equally distributed along the feeding port to the distal direction; the bottom diameter of the melting section 16 It gradually increases in the distal direction along the feed port.

The helical pitches of the melting section 16 and the feeding section 15 are equal; the melting section 16 acts as a barrier to the materials, increasing the extrusion pressure between the materials, making the melting of the materials more convenient and speeding up the melting efficiency.

The screw of the banburying section 28 is of equal diameter and has double rows of oblique serrated protrusions in the circumferential direction of the ring screw on the screw, and the serrated protrusions between the rows form a material available for melting that is inclined at a certain angle to the horizontal axis. Through the passage, the homogenization section 22 gradually increases from the connection with the banburying section 28 to the extension of the single-headed spiral bottom diameter, which is convenient for the transportation of the melted material, and increases a certain pressure to complete the re-extrusion of the melted material. , so that the material melts better.

The sleeve 2 has a thread groove 27 matched with the screw rib 13 on the screw rod 12 , and the material can be squeezed and pushed through the closed space formed by the screw rib 13 and the outer surface of the screw rod 12 .

The length of the mixing section 28 is 1/8-1/4 of the thread length of the feeding section 15 .

The banburying section 28 of the screw 12 is located at 1/3-1/2 of the position of the feeding section of the screw 12 , and the banburying section 28 is arranged between the melting section 16 and the homogenizing section 22 .

One side of the melting section 16 is provided with a homogenizing section 22. The homogenizing section 22 makes the melted material more compact, so that the melted material has better integrity and uniform granulation when extruded.

The axial length ratio of the melting section 16 and the feeding section 15 is 8:5.2, the axial length ratio of the melting section 16 and the homogenizing section 22 is 8:7.8, and the adjacent screw threads between the feeding section 15 and the melting section 16 are 8:7.8. The pitch ratio of the flanks is 1:1, the pitch ratio of the adjacent flanks of the melting section 16 and the homogenizing section 22 is 1:1.3, and the angle between the channel of the banburying section 28 and the horizontal axis is 30°.

The ratio of the screw diameter of the end of the screw feeding section close to the feed port to the screw diameter of the end of the melting section far from the feed port is 1:1.8, and the screw diameter of the end of the homogenization section close to the feed port is far from the homogenization section. The screw diameter ratio at one end of the feed port was 1.22:1.65.

An exhaust hole 8 is provided in the middle of the sleeve 2 , and the exhaust hole 8 is located on one side of the homogenization structure 22 . The sleeve 2 releases the pressure generated by the melted material through the vent hole 8 to avoid excessive pressure; the end of the screw 12 close to the feed port is of a conical structure.

The matching of the sleeve 2 with the gradually decreasing height of the screw rib 13 can ensure that the overall cross-sectional area of the screw rod 12 and the screw rib 13 is consistent, so that a conventional cylindrical sleeve 2 can be used.

As another preferred screw, referring to FIG. 5 , two banburying sections in the screw can be provided. The first banburying section 2811 is arranged in the middle of the melting section to divide the melting section into two parts, and the second banburying section 2812 It is set between the melting section and the homogenization section, and at the same time, according to actual needs, the banburying section can be set in a certain section of the feeding section or the homogenization section to achieve stepped pressurization; the part of the granulator other than the screw can be based on actual needs. In any case, select the same or equivalent replacement parts as the above-mentioned parts.

Embodiments of the present invention

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required for the description of the embodiments or the prior art are briefly introduced below, but are not intended to limit the protection scope of the present invention.

Best Mode: Example 1.

Referring to FIGS. 1 to 5, a feed melting mechanism of a pelletizer includes a sleeve 2 and a screw 12. The screw 12 is arranged inside the sleeve 2, and the screw 12 is provided with screw ribs. 13. One end of the sleeve 2 is provided with a feed port 9 .

A material containing cavity 14 with a certain space is formed between the screw rib 13 and the sleeve 2. The material containing cavity 14 squeezes and pressurizes the material through the screw 12 at the bottom of the spiral to realize the melting of the material; one end of the sleeve 2 is provided with an inlet. Material port 9, from one end of the feed port 9 to the middle of the screw 12, the volume of the material holding cavity 14 formed between the screw rib 13 and the sleeve 2 varies in size. The thread groove 27 in a certain airtight space is used to extrude, pressurize and melt the material in the material holding cavity 14 with different volumes through the screw 12; one end of the screw 12 is the screw motor shaft 201 connected to the motor.

The screw 12 includes a feeding section 15 , a melting section 16 , an internal mixing section 28 and a homogenizing section 22 .

The feeding section 15 and the melting section 16 form a double-ended helix from the feeding port of the sleeve to the distal direction, and the bottom diameter of the feeding section 15 is equally distributed along the feeding port to the distal direction; the bottom diameter of the melting section 16 It gradually increases in the distal direction along the feed port.

The helical pitches of the melting section 16 and the feeding section 15 are equal; the melting section 16 acts as a barrier to the materials, increasing the extrusion pressure between the materials, making the melting of the materials more convenient and speeding up the melting efficiency.

The screw of the banburying section 28 is of equal diameter and has double rows of oblique serrated protrusions in the circumferential direction of the ring screw on the screw, and the serrated protrusions between the rows form a material available for melting that is inclined at a certain angle to the horizontal axis. Through the passage, the homogenization section 22 gradually increases from the connection with the banburying section 28 to the extension of the single-headed spiral bottom diameter, which is convenient for the transportation of the melted material, and increases a certain pressure to complete the re-extrusion of the melted material. , so that the material melts better.

The sleeve 2 has a thread groove 27 matched with the screw rib 13 on the screw rod 12 , and the material can be squeezed and pushed through the closed space formed by the screw rib 13 and the outer surface of the screw rod 12 .

The length of the mixing section 28 is 1/8-1/4 of the thread length of the feeding section 15 .

The banburying section 28 of the screw 12 is located at 1/3-1/2 of the position of the feeding section of the screw 12 , and the banburying section 28 is arranged between the melting section 16 and the homogenizing section 22 .

One side of the melting section 16 is provided with a homogenizing section 22. The homogenizing section 22 makes the melted material more compact, so that the melted material has better integrity and uniform granulation when extruded.

The axial length ratio of the melting section 16 and the feeding section 15 is 8:5.2, the axial length ratio of the melting section 16 and the homogenizing section 22 is 8:7.8, and the adjacent screw threads between the feeding section 15 and the melting section 16 are 8:7.8. The pitch ratio of the flanks is 1:1, the pitch ratio of the adjacent flanks of the melting section 16 and the homogenizing section 22 is 1:1.3, and the angle between the channel of the banburying section 28 and the horizontal axis is 30°.

The ratio of the screw diameter of the end of the screw feeding section close to the feed port to the screw diameter of the end of the melting section far from the feed port is 1:1.8, and the screw diameter of the end of the homogenization section close to the feed port is far from the homogenization section. The screw diameter ratio at one end of the feed port was 1.22:1.65.

An exhaust hole 8 is provided in the middle of the sleeve 2 , and the exhaust hole 8 is located on one side of the homogenization structure 22 . The sleeve 2 releases the pressure generated by the melted material through the vent hole 8 to avoid excessive pressure; the end of the screw 12 close to the feed port is of a conical structure.

The matching of the sleeve 2 with the gradually decreasing height of the screw rib 13 can ensure that the overall cross-sectional area of the screw rod 12 and the screw rib 13 is consistent, so that a conventional cylindrical sleeve 2 can be used.

As another preferred screw, referring to FIG. 5 , two banburying sections in the screw can be provided. The first banburying section 2811 is arranged in the middle of the melting section to divide the melting section into two parts, and the second banburying section 2812 It is set between the melting section and the homogenization section, and at the same time, according to actual needs, the banburying section can be set in a certain section of the feeding section or the homogenization section to achieve stepped pressurization; the part of the granulator other than the screw can be based on actual needs. In any case, select the same or equivalent replacement parts as the above-mentioned parts.

Example 2.

A granulator, comprising the feeding and melting mechanism in Example 1, and also comprising a cyclone hood 1, a sleeve 2, a transmission motor 3, a reduction box 4, a cutter motor 5, a pelletizing plate 11, a filter and a winnowing The transmission motor 3 is connected with the reduction box 4, the pelletizing plate 11 is fixed on the cyclone hood 1, the two ends of the sleeve 2 are respectively fixed on the pelleting plate 11 and the reduction box 4, the screw 12 It is arranged inside the sleeve 2; the cutter motor 5 is installed on one side of the cyclone hood 1, and a motor shaft 20 is installed on the cutter motor 5, and one end of the motor shaft 20 extends to the inner side of the cyclone hood 1. The motor shaft 20 is provided with a through hole 26 along the axial direction, one end of the motor shaft 20 is provided with an air outlet 17 connected to the through hole 26, the air outlet 17 is installed with a jet pipe 21, and one end of the motor shaft 20 is installed with a gas outlet 17. The cutter seat 18, the cutter 19 is installed on the cutter seat 18, and the cutter 19 and the cutter seat 18 are connected by screws; , the winnowing mechanism 25 is connected with the particle outlet joint 7 of the cyclone hood 1 .

An air inlet and a particle outlet are installed on the cyclone hood 1, an air inlet connector 6 is installed on the air inlet, and a particle outlet connector 7 is installed on the particle outlet, and the inside of the cyclone hood 1 is facing the air inlet connector 6. The partition plate 10 forms an air duct for upward air outlet between the partition plate 10 and the cyclone cover 1 .

The cyclone hood 1 quickly cools the cut granular material through the air outlet of the air duct, and at the same time presses the granular material to the particle outlet, which is convenient for air selection.

One end of the sleeve 2 is provided with a feeding port 9, and the sleeve 2 releases the pressure generated by the melted material through the exhaust hole 8 to avoid excessive pressure; the end of the screw 12 close to the feeding port is a conical structure; The granulator is provided with a general material inlet 24 , and the lower end of the general material inlet 24 is connected to the feeding port 9 .

The filter includes a screen plate 32, a horn scraper 33, a porous flange 31 and a discharge part. The porous flange 31 is located at one end away from the feeding port of the sleeve, and one end of the porous flange 31 is fixedly connected to the sleeve; the porous flange 31 The outer side of the other end is fixedly connected with a granulation flange 34; the interior of the porous flange 31 is hollow and is provided with uniform holes that run through the axial direction. Filter the molten material; the horn scraper 33 is coaxial with the screw 12, and is controlled to rotate by the same motor; the hollow inner cylindrical inner ring surface of the porous flange 31 has an impurity removal notch 36, and the impurity removal notch 36 is arranged on the horn scraper 33 Further, a discharge part is fixedly connected to the lower end of the porous flange 31, and the discharge part passes through the porous flange through the impurity removal gap 36, and the discharge part includes an impurity discharge pipe 37, an impurity discharge flange 38 and a rotary handle 39, and is connected with the porous flange 31 through the impurity removal notch 36;

The granulation flange 34 includes the granulation plate 11 and the guide cone 35, the granulation flange 34 is a hollow cylindrical inner annular surface, and one side of the hollow cylindrical inner annular surface of the granulation flange 34 is fixedly connected with the porous flange 31. The particle plate 11 is located on the other side of the inner annular surface of the hollow cylinder of the particle outlet flange 34, and is fixedly connected with the guide cone 35. The guide cone 35 is located inside the particle outlet flange 34, and the bottom surface of the guide cone is arranged on the particle outlet plate. On the top, the guide cone is in the shape of a cone as a whole, and the cross-sectional area at the porous flange 31 in the direction of the particle outlet plate 11 gradually increases; The pellet plate 11 is provided with extrusion holes, and the cutter is arranged on the outer side of the pellet discharge plate 11. The position of the cutter is not shown in the figure, and it cuts the extruded material into segments or pellets.

When the invention is used, the material head to be processed is sent to the main material inlet, the material enters the sleeve from the material inlet, and the transmission motor drives the screw to rotate through the action of the reduction box. It drives the material to rotate, and at the same time is affected by the height of the screw and the gradual reduction of the material holding cavity, the material is squeezed, and the temperature between the materials rises, so that the materials are melted, and the melted material enters the material holding tank from the melting structure. , for re-melting, and then enter the screen plate through the action of the homogenization structure and the screw edge, and the material is further melted by the thrust extrusion of the horn scraper, and the impurities in the material are attached to the screen plate at the same time. The impurities are discharged to the impurity removal gap; the material from the screen plate enters the guide cone, accumulates and mixes in the discharge flange, and is extruded through the extrusion hole of the particle discharge plate under the action of extrusion; the material is extruded by the extruder. When the hole is extruded, the motor drives the cutter to rotate, and the cutter cuts the extruded material into granules or flakes; in the process of cutting the cutter, the air sent by the external air supply equipment passes through the through hole of the motor shaft. The air port and the air jet pipe are blown out to cool the material caused by the cutter, and at the same time, the cutter is continuously cooled; at the same time, the fan connected to the air inlet interface works, and the air is blown out from the air duct through the action of air pressure and the air selection mechanism. The effect of negative pressure will make the cut granular material enter the air separation mechanism from the particle outlet.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that are not conceived of without creative work should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Industrial Applicability

The screw melting mechanism of the granulator of the present invention is an implementable technical solution that conforms to the laws of nature and has technical characteristics, can be manufactured and used in industry, and has positive and beneficial economic, technical and social effects.

Claims (10)

A feed melting mechanism of a granulator, characterized in that it comprises a sleeve and a screw driven by a power device arranged inside the sleeve; One end of the sleeve is provided with a feeding port, and a threaded groove is arranged inside the sleeve; the screw is provided with a screw rib, and the screw rib cooperates with the threaded groove on the sleeve to form a material holding cavity, and the screw is provided with a screw groove. In the material holding cavity, the screw pressurizes and pressurizes the material through the gradual change of the bottom diameter and the outer diameter of the screw to realize the melting of the material. The feeding and melting mechanism of the granulator according to claim 1, wherein the screw is divided into a feeding section, a melting section, an internal mixing section and an equalizing section from the feeding port of the sleeve to the distal direction. The mixing section, the feeding section and the melting section are used for gradually pressurized extrusion melting of the material, the banburying section further pressurizes the material passing through the feeding section and the melting section, and the homogenizing section is used for the banburying section. After the material is depressurized, it is gradually pressurized and mixed evenly. The feeding and melting mechanism of the granulator according to claim 2, characterized in that: the feeding section and the melting section form a double-ended helix from the feeding port of the sleeve to the distal direction, and the The screw diameter and bottom diameter of the feeding section are uniform; the bottom diameter of the melting section gradually increases toward the distal end along the feeding port. The feed melting mechanism of the granulator according to claim 2, characterized in that: the screw of the banburying section is of equal diameter and has double rows of oblique serrated protrusions in the circumferential direction of the ring screw on the screw. A channel for the material to pass through, which is inclined at a certain angle to the horizontal axis, is formed by a sawtooth-like protrusion between the row and the row. The feed melting mechanism of the granulator according to claim 2, characterized in that: the homogenization section is a single-ended helix and the bottom diameter gradually increases along the material flow direction. The feed melting mechanism of the granulator according to claim 2, wherein the axial length ratio of the melting section and the feeding section is 1:1~2, and the axial length ratio of the melting section and the homogenizing section is 1:1~2. The length ratio is 1:0.8～1.2, and the length of the banburying section is 1/8～1/4 of the axial length of the feeding section; the adjacent screw pitch ratio of the feeding section and the melting section is 1: 0.8 to 1.2, the pitch ratio of the adjacent helixes of the melting section and the homogenization section is 1:0.8 to 1.3, and the angle between the inclined channel of the banburying section and the horizontal axis is 25 to 35°. The feed melting mechanism of the granulator according to claim 2, wherein the ratio of the screw diameter of the feeding section to the screw diameter of the end of the melting section away from the feeding port is 1:1.5~2, and the The ratio of the screw diameter of the end of the homogenization section close to the feed port to the screw diameter of the end of the homogenization section away from the feed port is 1:1.2~1.8, and the screw diameter of the end of the homogenization section close to the feed port is larger than that of the feeding section. The screw diameter is smaller than the screw diameter of the end of the melting section away from the feed port. The feed melting mechanism of the granulator according to claim 2 is characterized in that: the banburying section is one or more sections; when the banburying section is one section, the banburying section is arranged in the melting section and the homogenization section. between the sections; when the banburying section is multi-stage, the plurality of banburying sections are all arranged between the melting section and the homogenizing section, or are respectively arranged between the melting section and the melting section and the homogenizing section. In the feeding and melting mechanism of the granulator according to claim 1, a vent hole is provided in the middle of the sleeve near the homogenizing structure, and one end of the screw is a screw motor shaft connected to the motor. A granulator, characterized in that it comprises the feed melting mechanism described in any one of claims 1 to 7.