UPVC (unplasticized polyvinyl chloride) modified granulation device

Abstract

The utility model relates to the technical field of UPVC (Unplasticized Polyvinyl Chloride) processing, in particular to a UPVC modified granulating device, which aims to solve the problems of large occupied area and low efficiency of the conventional granulating device, and comprises a thermostat and an annular forming bin, the feeding end of the thermostat is connected with the discharging port of a single-screw extruder, and the annular forming bin is mounted at the discharging end of the thermostat; a scraper assembly and a spiral feeding assembly are arranged in the annular forming bin, a driving assembly is arranged on the annular forming bin, and the driving assembly is used for driving the scraper assembly and the spiral feeding assembly; an air cooling assembly is installed on the annular forming bin, an air blowing pipe is installed on the annular forming bin in a communicating mode, and the air cooling assembly is connected with the air blowing pipe. The granulation equipment has the effects of reducing the occupied area of the granulation equipment and avoiding resource waste.

Description

TECHNICAL FIELD

[0001] The application relates to the UPVC processing technical field, in particular to a UPVC modification granulation device. BACKGROUND

[0002] UPVC, also known as hard PVC, is a kind of amorphous thermoplastic resin composed of chloroethylene monomer polymerization and certain additives. In addition to being combined with additives, it can also be blended with other resins for modification, which has obvious practical value.

[0003] UPVC has poor flowability, high melt viscosity, and close forming temperature and thermal decomposition temperature, so the temperature range for forming is very narrow and it is difficult to process. Therefore, UPVC needs to be mixed with various additives before processing. Through the addition of various additives for modification and granulation, subsequent production is realized. Generally, modification granulation has a special granulation equipment. After mixing the raw materials, heating and melting, the UPVC long strip is extruded through a single screw extruder, and then solidified and dried after water cooling and air cooling, and finally cut into small particles by a cutting machine.

[0004] However, most production enterprises have low demand for modification granulation, but some products do need to be modified and granulated first to facilitate subsequent production; only used for a short time, and there is no requirement for the size, uniformity and particle shape of the granulation. The cost of specially setting a set of water cooling and air cooling equipment and a granulator is high, the land occupation is large, and the equipment is wasted for a long time, so it needs to be improved. CONTENT OF THE INVENTION

[0005] In order to reduce the land occupation of the granulation equipment and avoid resource waste, the application provides a UPVC modification granulation device.

[0006] The UPVC modification granulation device provided by the application adopts the following technical scheme:

[0007] A UPVC modification granulation device, comprising a thermostat and a ring forming bin, the feed end of the thermostat is connected with the discharge port of a single screw extruder, and the ring forming bin is installed at the discharge end of the thermostat; a scraper assembly and a spiral feeding assembly are arranged in the ring forming bin, a driving assembly is arranged on the ring forming bin, and the driving assembly is used to drive the scraper assembly and the spiral feeding assembly; an air cooling assembly is installed on the ring forming bin, a blowing pipe is communicated and installed on the ring forming bin, and the air cooling assembly is connected with the blowing pipe.

[0008] By adopting the technical scheme, the melted UPVC is extruded from the discharge end of the thermostat by the single-screw extruder, the air-cooling assembly blows cold air to the thermostat through the blowing pipe, and the extruded UPVC is preliminarily solidified on the outer surface. The driving assembly drives the scraper assembly to rotate and cut in the ring forming bin, and the UPVC particles continue to be cooled by the cold air during falling. At the same time, the driving assembly drives the spiral feeding assembly to scrape the particles accumulated at the bottom of the ring forming bin, and finally the particles are scraped to the discharge pipe. The device has high granulation efficiency and small occupied area, which is beneficial to UPVC modification and granulation.

[0009] Optionally, the scraper assembly comprises a main shaft, a center mounting ring, an edge mounting ring and four blades arranged in a circumferential array along the center mounting ring, one end of the main shaft is rotatably connected to the center of the inner wall of the ring forming bin through a rotating seat, and the other end is connected to the driving assembly, the center mounting ring is sleeved and mounted on the main shaft, and the two ends of the length direction of the blade are connected to the outer side wall of the center mounting ring and the inner side wall of the edge mounting ring, respectively; a plurality of buckles are mounted on the inner wall of the ring forming bin, the buckle is a circular ring with an opening, and the outer side wall of the edge mounting ring is in sliding fit with the inner side wall of the buckle; the blade is matched with the discharge end of the thermostat, the thermostat is eccentrically arranged in the ring forming bin, the center mounting ring and the edge mounting ring are concentrically arranged in the ring forming bin, and the length of the blade is greater than the diameter of the thermostat.

[0010] By adopting the technical scheme, the driving assembly drives the main shaft to rotate clockwise, the main shaft drives the center mounting ring and the blade to rotate, the edge mounting ring slides in the buckle, and the blade is always close to the side wall of the thermostat at the discharge end. Each blade cuts when moving to the upper region of the ring forming bin in a clockwise direction.

[0011] Optionally, the spiral feeding assembly comprises a sleeve, a connecting piece and two scrapers, the sleeve is sleeved outside the main shaft, the inner wall of the sleeve is in sliding fit with the outer wall of the main shaft, the outer wall of the sleeve is in sliding fit with the ring forming bin, and the sleeve is connected with the driving assembly; the two scrapers are arranged on the two sides of the sleeve, respectively, and the side wall of the scraper away from the sleeve is close to the inner wall of the ring forming bin; each scraper is connected with the sleeve through three connecting pieces, the three connecting pieces are evenly arranged along the length direction of the sleeve, and the side wall of the connecting piece closest to the blade can be close to the side wall of the blade.

[0012] Optionally, the side wall of the scraper away from the sleeve is wavy along the length direction, the bottom wall of the ring forming bin is communicated with a discharge pipe, the discharge pipe is arranged on the side of the ring forming bin away from the thermostat bin, and the particles falling on the bottom of the ring forming bin are scraped by the scraper to approach the discharge pipe.

[0013] Optionally, a plurality of holes are formed in the scraper along the thickness direction.

[0014] By adopting the technical scheme, the side wall of the scraper away from the sleeve is attached to the inner wall of the annular forming bin, the side wall of the scraper away from the sleeve is wavy along the length direction, the driving assembly drives the sleeve to rotate clockwise, the sleeve drives the two scrapers thereon to rotate along the inner wall of the annular forming bin, and the scrapers scrape the particles falling on the bottom of the annular forming bin to be close to the discharge pipe. The scraper is provided with a plurality of holes penetrating in the thickness direction, and the particles can be continuously cooled and solidified during the movement of the scraper.

[0015] Optionally, the driving assembly comprises a motor, a driving wheel, a driven wheel and a gear set, the shell of the motor is fixedly connected with the annular forming bin through a support frame, the motor shaft of the motor is connected with the driving wheel, the driving wheel is rotatably connected with the outer side wall of the annular forming bin through a rotating shaft, the driven wheel is installed at one end of the main shaft away from the constant-temperature bin, and the driving wheel and the driven wheel are drivingly connected through a belt; the sleeve and the main shaft are drivingly connected through the gear set, and the angular velocity of the rotation of the sleeve is twice the angular velocity of the rotation of the main shaft.

[0016] Optionally, the gear set comprises a first gear, a second gear, a third gear and a fourth gear, the first gear is sleeved on the main shaft and fixedly connected with the main shaft, the fourth gear is sleeved on the sleeve and fixedly connected with the sleeve, the second gear and the third gear are rotatably connected with the outer side wall of the annular forming bin through a same rotating shaft, the second gear is engaged with the first gear, and the third gear is engaged with the fourth gear; the angular velocity of the rotation of the fourth gear is twice the angular velocity of the rotation of the first gear.

[0017] By adopting the technical scheme, the motor drives the main shaft to rotate clockwise by 90 degrees through belt transmission, and the main shaft drives the sleeve to rotate clockwise by 180 degrees. During this process, the connecting piece closest to the blade catches up with the blade from the back, the side wall of the connecting piece slides off the side wall of the blade, the solidified UPVC remaining on the blade is scraped off, and the blade is cleaned. One motor can drive the main shaft and the sleeve to rotate at different speeds, thereby reducing the number of driving devices.

[0018] Optionally, the air cooling assembly comprises an air cooler, the shell of the air cooler is fixedly connected with the annular forming bin through a support frame, and the output end of the air cooler is connected with a blowing pipe; the blowing pipe is installed at the bottom of the annular forming bin, and one end of the blowing pipe away from the air cooler is arranged towards the thermostat.

[0019] By adopting the technical scheme, the air cooler blows cold air towards the thermostat through the blowing pipe, thereby accelerating the efficiency of the preliminary solidification of the outer surface of the extruded UPVC.

[0020] In summary, the present application has at least one of the following beneficial technical effects:

[0021] 1. The molten UPVC is extruded from the discharge end of the thermostat by the single screw extruder, and the air-cooling assembly blows cold air to the thermostat through the blowing pipe to preliminarily solidify the outer surface of the extruded UPVC. The driving assembly drives the scraper assembly to rotate and cut in the ring forming bin, and the UPVC particles continue to be cooled by the cold air during the falling process. At the same time, the driving assembly drives the spiral feeding assembly to scrape the particles accumulated at the bottom of the ring forming bin, and finally the particles are scraped to the discharge pipe. The device has high granulation efficiency and small floor area, which is beneficial to UPVC modification and granulation;

[0022] 2. The side wall of the scraper away from the sleeve is attached to the inner wall of the ring forming bin, and the side wall of the scraper away from the sleeve is wavy along the length direction. The driving assembly drives the sleeve to rotate clockwise, and the sleeve drives the two scrapers on it to rotate along the inner wall of the ring forming bin, and the scrapers scrape the particles falling at the bottom of the ring forming bin to the discharge pipe. A plurality of holes are provided on the scraper along the thickness direction, and the particles can be continuously cooled and solidified during the movement of the scraper;

[0023] 3. The motor drives the main shaft to rotate clockwise by 90 degrees through the belt transmission, and the main shaft drives the sleeve to rotate clockwise by 180 degrees. In this process, the connecting piece closest to the blade catches up from the rear, and the side wall of the connecting piece slides over the side wall of the blade, scraping off the solidified UPVC remaining on the blade and cleaning the blade. One motor can drive the main shaft and the sleeve to rotate at different speeds, reducing the number of driving devices. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structure schematic diagram of a UPVC modification and granulation device according to an embodiment of the present application.

[0025] Figure 2 is a structure schematic diagram of the inside of the ring forming bin according to an embodiment of the present application.

[0026] Figure 3 is a structure schematic diagram of the scraper assembly according to an embodiment of the present application.

[0027] Figure 4 is a structure schematic diagram of the spiral feeding assembly according to an embodiment of the present application.

[0028] Figure 5 is a structure schematic diagram of the driving assembly according to an embodiment of the present application.

[0029] Figure 6 is a structure schematic diagram of the blade and the scraper according to an embodiment of the present application.

[0030] Explanation of reference signs: 1, thermostat; 2, ring forming bin; 21, blowing pipe; 22, discharge pipe; 3, scraper assembly; 31, main shaft; 32, center mounting ring; 33, edge mounting ring; 34, blade; 35, buckle; 4, spiral feeding assembly; 41, sleeve; 42, connecting plate; 43, scraper plate; 5, driving assembly; 51, motor; 52, driving wheel; 53, driven wheel; 54, gear set; 541, first gear; 542, second gear; 543, third gear; 544, fourth gear; 6, air cooling assembly; 7, single screw extruder; 8, support frame. DETAILED DESCRIPTION

[0031] The following will be described in detail below with reference to the accompanying drawings. Figures 1-5 The present application is further described in detail.

[0032] The embodiments of the present application disclose a UPVC modified granulation device. Figure 1 And Figure 2 A UPVC modified granulation device comprises a thermostat 1, a plurality of discharge channels are arranged in the thermostat 1, and a feeding end of the thermostat 1 is connected with a discharge port of a single screw extruder 7. A ring forming bin 2 is installed at a discharge end of the thermostat 1, a circular hole is formed in a side wall of the ring forming bin 2, and the discharge end of the thermostat 1 is arranged in the ring forming bin 2 through the circular hole. A scraper assembly 3 and a spiral feeding assembly 4 are arranged in the ring forming bin 2, a driving assembly 5 is arranged on the ring forming bin 2, and the driving assembly 5 is used for driving the scraper assembly 3 and the spiral feeding assembly 4. A discharge pipe 22 is communicated with a bottom wall of the ring forming bin 2, and the discharge pipe 22 is arranged on a side of the ring forming bin 2 away from the thermostat bin. A blowing pipe 21 is communicated and installed on the ring forming bin 2, the blowing pipe 21 is installed at the bottom of the ring forming bin 2, an air cooling assembly 6 is installed on the ring forming bin 2, the air cooling assembly 6 is connected with the blowing pipe 21, and an end of the blowing pipe 21 away from a cooling fan is arranged towards the thermostat 1. The discharge pipe 22 and the blowing pipe 21 are arranged at two sides of the ring forming bin 2 at intervals. The support frame 8 is fixedly installed at the bottom of the ring forming bin 2.

[0033] The melted UPVC is extruded from the discharge end of the thermostat 1 by the single screw extruder 7, the air cooling assembly 6 blows cold air to the thermostat 1 through the blowing pipe 21, and the outer surface of the extruded UPVC is preliminarily solidified. The driving assembly 5 drives the scraper assembly 3 to rotate and cut in the ring forming bin 2, and the UPVC particles continue to be cooled by the cold air during falling. Meanwhile, the driving assembly 5 drives the spiral feeding assembly 4 to scrape the particles accumulated at the bottom of the ring forming bin 2, and finally the particles are scraped to the discharge pipe 22. The device has high granulation efficiency and small floor area, and is beneficial to UPVC modified granulation.

[0034] The air cooling assembly 6 comprises a cooling fan, an outer shell of the cooling fan is fixedly connected with the ring forming bin 2 through the support frame 8, and an output end of the cooling fan is connected with the blowing pipe 21.

[0035] Referring to Figure 3 and Figure 4 , the scraper assembly 3 comprises a main shaft 31, one end of which is rotatably connected with the center of the inner wall of the ring forming chamber 2 through a rotating seat, and the other end is connected with the driving assembly 5, which drives the main shaft 31 to rotate clockwise along its axial direction. The end of the main shaft 31 close to the thermostat 1 is sleeved with a center mounting ring 32, and the inner wall of the center mounting ring 32 is fixedly connected with the peripheral wall of the main shaft 31 through bolts. Four blades 34 are arranged in the circumferential direction of the center mounting ring 32, and an edge mounting ring 33 is arranged on the outer side of the center mounting ring 32. The two ends of the blade 34 in the length direction are respectively connected with the outer side wall of the center mounting ring 32 and the inner side wall of the edge mounting ring 33. The blade 34 cooperates with the discharge end of the thermostat 1, the thermostat 1 is eccentrically arranged in the ring forming chamber 2, and the main shaft 31 is installed below the thermostat 1. The center mounting ring 32 and the edge mounting ring 33 are concentrically arranged in the ring forming chamber 2, and the length of the blade 34 is greater than the diameter of the thermostat 1. A plurality of buckles 35 are installed on the inner wall of the ring forming chamber 2, the buckle 35 is a circular ring with an opening, and the outer peripheral wall of the edge mounting ring 33 is in sliding cooperation with the inner peripheral wall of the buckle 35.

[0036] The driving assembly 5 drives the main shaft 31 to rotate clockwise, and the rotation of the main shaft 31 drives the center mounting ring 32 and the blade 34 to rotate, and the edge mounting ring 33 slides in the buckle 35, so that the blade 34 is always in close contact with the side wall of the thermostat 1 at the discharge end. Each blade 34 cuts when it moves to the upper region of the ring forming chamber 2 in the clockwise rotation.

[0037] Referring to Figure 3 and Figure 4 , the screw feeding assembly 4 comprises a sleeve 41 sleeved outside the main shaft 31, the inner wall of the sleeve 41 is in sliding cooperation with the outer wall of the main shaft 31, the outer wall of the sleeve 41 is in sliding cooperation with the ring forming chamber 2, and the end of the sleeve 41 away from the thermostat 1 is connected with the driving assembly 5, which drives the sleeve 41 to rotate clockwise along its axial direction. Two scrapers 43 are arranged on both sides of the sleeve 41, each scraper 43 is connected with the sleeve 41 through three connecting pieces 42, the three connecting pieces 42 are evenly arranged along the length direction of the sleeve 41, and the side wall of the connecting piece 42 closest to the blade 34 can be in close contact with the side wall of the blade 34.

[0038] The side wall of the scraper 43 away from the sleeve 41 is attached to the inner wall of the ring forming chamber 2, and the side wall of the scraper 43 away from the sleeve 41 is wavy along the length direction. The driving assembly 5 drives the sleeve 41 to rotate clockwise, and the rotation of the sleeve 41 drives the two scrapers 43 on it to rotate along the inner wall of the ring forming chamber 2, and the scraper 43 scrapes the particles falling on the bottom of the ring forming chamber 2 to move close to the discharge pipe 22. A plurality of holes are formed in the thickness direction of the scraper 43, and the scraper 43 can continue to cool and solidify the particles during movement.

[0039] Referring to Figure 3 and Figure 4 , the driving assembly 5 includes a motor 51, and the shell of the motor 51 is fixedly connected with the ring forming chamber 2 through the support frame 8. A driving wheel 52 is fixedly installed on the motor shaft of the motor 51, and the driving wheel 52 is rotatably connected with the outer side wall of the ring forming chamber 2 through a rotating shaft. A driven wheel 53 is fixedly installed on the end of the main shaft 31 away from the constant temperature chamber, and the driving wheel 52 and the driven wheel 53 are drivingly connected through a belt. A gear set 54 is further arranged, and the sleeve 41 and the main shaft 31 are drivingly connected through the gear set 54. The angular velocity of the rotation of the sleeve 41 is twice the angular velocity of the rotation of the main shaft 31.

[0040] Referring to Figure 5 , the gear set 54 includes a first gear 541, a second gear 542, a third gear 543 and a fourth gear 544. The first gear 541 is sleeved on the main shaft 31 and fixedly connected with the main shaft 31. The fourth gear 544 is sleeved on the sleeve 41 and fixedly connected with the sleeve 41. The second gear 542 and the third gear 543 are rotatably connected with the outer side wall of the ring forming chamber 2 through the same rotating shaft. The second gear 542 is engaged with the first gear 541, and the third gear 543 is engaged with the fourth gear 544. The angular velocity of the rotation of the fourth gear 544 is twice the angular velocity of the rotation of the first gear 541.

[0041] Referring to Figure 6 , the four blades 34 are respectively named A1, A2, A3 and A4, and the two scrapers 43 are respectively named B1 and B2. Six instantaneous positions ①, ②, ③, ④, ⑤ and ⑥ are arranged inside the ring forming chamber 2. At a certain moment, A1, A2, A3 and A4 are respectively located at ①, ②, ③ and ④, and B1 and B2 are respectively located at ⑤ and ⑥. The motor 51 drives the main shaft 31 to rotate clockwise by 90 degrees through belt driving, and A1 moves from ① to ②. The main shaft 31 drives the sleeve 41 to rotate clockwise by 180 degrees, and B1 moves from ⑤ to ⑥. At this time, A4 is located at ①, and B2 is located at ⑤.

[0042] In this process, the connecting piece 42 closest to the blade 34 overtakes the blade 34 from the back, and the side wall of the connecting piece 42 slides over the side wall of the blade 34, scraping off the solidified UPVC remaining on the blade 34 and cleaning the blade 34.

[0043] The implementation principle of the UPVC modification granulation device is as follows: the melted UPVC is extruded from the discharge end of the thermostat 1 by the single-screw extruder 7, the cold air machine blows cold air to the thermostat 1 through the blowing pipe 21, and the outer surface of the extruded UPVC is preliminarily solidified. The motor 51 drives the main shaft 31 to rotate the blade 34 clockwise, the blade 34 always rotates and cuts the side wall of the thermostat 1 at the discharge end, and the UPVC particles continue to be cooled by the cold air during the falling process. At the same time, the rotation of the main shaft 31 drives the sleeve 41 to rotate at twice the angular velocity through the gear set 54, the rotation of the sleeve 41 drives the scraper 43 to rotate clockwise to scrape the particles accumulated at the bottom of the ring forming bin 2, and finally the particles are scraped to the discharge pipe 22. When the sleeve 41 rotates, the connecting piece 42 closest to the blade 34 slides off the side wall of the blade 34, scrapes off the solidified UPVC remaining on the blade 34, and cleans the blade 34. The device has high granulation efficiency and small floor area, and is beneficial to UPVC modification granulation.

[0044] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A UPVC modification granulation device characterized by: The application relates to a ring forming and shaping bin (2) and a thermostat (1), the feeding end of the thermostat (1) is connected with the discharge port of a single screw extruder (7), the ring forming and shaping bin (2) is installed at the discharge end of the thermostat (1); a scraper assembly (3) and a spiral feeding assembly (4) are arranged in the ring forming and shaping bin (2), a driving assembly (5) is arranged on the ring forming and shaping bin (2), and the driving assembly (5) is used for driving the scraper assembly (3) and the spiral feeding assembly (4); an air cooling assembly (6) is installed on the ring forming and shaping bin (2), a blowing pipe (21) is communicated and installed on the ring forming and shaping bin (2), and the air cooling assembly (6) is connected with the blowing pipe (21).

2. A UPVC modifying and pelletizing device as claimed in claim 1, wherein: The scraper assembly (3) comprises a main shaft (31), a center mounting ring (32), an edge mounting ring (33) and four blades (34) arranged in a circumferential array along the center mounting ring (32), one end of the main shaft (31) is rotationally connected with the center of the inner wall of the ring forming and shaping bin (2) through a rotating seat, the other end is connected with the driving assembly (5), the center mounting ring (32) is sleeved and mounted on the main shaft (31), and the two ends of the length direction of the blade (34) are connected with the outer side wall of the center mounting ring (32) and the inner side wall of the edge mounting ring (33) respectively; a plurality of buckles (35) are mounted on the inner wall of the ring forming and shaping bin (2), the buckle (35) is a circular ring with an opening, the outer side circumferential wall of the edge mounting ring (33) is in sliding fit with the inner side circumferential wall of the buckle (35); the blade (34) is matched with the discharge end of the thermostat (1), the thermostat (1) is eccentrically arranged in the ring forming and shaping bin (2), the center mounting ring (32) and the edge mounting ring (33) are concentrically arranged in the ring forming and shaping bin (2), and the length of the blade (34) is greater than the diameter of the thermostat (1).

3. A UPVC modifying and pelletizing device as claimed in claim 2, wherein: The spiral feeding assembly (4) comprises a sleeve (41), a connecting piece (42) and two scrapers (43), the sleeve (41) is sleeved outside the main shaft (31), the inner wall of the sleeve (41) is in sliding fit with the outer wall of the main shaft (31), the outer wall of the sleeve (41) is in sliding fit with the ring forming and shaping bin (2), and the sleeve (41) is connected with the driving assembly (5); the two scrapers (43) are arranged on the two sides of the sleeve (41) respectively, and the side wall, away from the sleeve (41), of the scraper (43) is attached to the inner wall of the ring forming and shaping bin (2); each scraper (43) is connected with the sleeve (41) through three connecting pieces (42), the three connecting pieces (42) are uniformly arranged along the length direction of the sleeve (41), and the side wall of the connecting piece (42) closest to the blade (34) can be attached to the side wall of the blade (34).

4. A UPVC modifying and pelletizing device as claimed in claim 3, wherein: The side wall, away from the sleeve (41), of the scraper (43) is in a wavy shape along the length direction, the bottom wall of the ring forming and shaping bin (2) is communicated with a discharge pipe (22), the discharge pipe (22) is arranged on the side, away from the thermostat bin, of the ring forming and shaping bin (2), and the particles falling on the bottom of the ring forming and shaping bin (2) are scraped by the scraper (43) to approach the discharge pipe (22).

5. A UPVC modifying and pelletizing device as claimed in claim 3, wherein: A plurality of holes are formed through the thickness direction of the scraper (43).

6. A UPVC modifying and pelletizing device as claimed in claim 3, wherein: The driving assembly (5) comprises a motor (51), a driving wheel (52), a driven wheel (53) and a gear set (54), the shell of the motor (51) is fixedly connected with the ring-formed shaping bin (2) through the support frame (8), the motor shaft of the motor (51) is connected with the driving wheel (52), the driving wheel (52) is rotatably connected with the outer side wall of the ring-formed shaping bin (2) through a rotating shaft, the driven wheel (53) is installed at one end of the main shaft (31) far away from the constant-temperature bin, and the driving wheel (52) and the driven wheel (53) are drivingly connected through a belt; the sleeve (41) and the main shaft (31) are drivingly connected through the gear set (54), and the angular velocity of the rotation of the sleeve (41) is twice that of the rotation of the main shaft (31).

7. A UPVC modifying and pelletizing device as claimed in claim 6, wherein: The gear set (54) comprises a first gear (541), a second gear (542), a third gear (543) and a fourth gear (544), the first gear (541) is sleeved on the main shaft (31) and is fixedly connected with the main shaft (31), the fourth gear (544) is sleeved on the sleeve (41) and is fixedly connected with the sleeve (41), the second gear (542) and the third gear (543) are rotatably connected with the outer side wall of the ring-formed shaping bin (2) through the same rotating shaft, the second gear (542) is engaged with the first gear (541), and the third gear (543) is engaged with the fourth gear (544); the angular velocity of the rotation of the fourth gear (544) is twice that of the rotation of the first gear (541).

8. A UPVC modifying and pelletizing device as claimed in claim 2, wherein: The air-cooling assembly (6) comprises a cold air machine, the shell of the cold air machine is fixedly connected with the ring-formed shaping bin (2) through the support frame (8), and the output end of the cold air machine is connected with the blowing pipe (21); the blowing pipe (21) is installed at the bottom of the ring-formed shaping bin (2), and one end of the blowing pipe (21) far away from the cold air machine is arranged towards the thermostat (1).

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