Granulation equipment for PA66 slice production and preparation

Abstract

The invention discloses pelletizing equipment for PA slice production and preparation, and relates to the technical field of PA preparation.The pelletizing equipment for PA slice production and preparation comprises a screw extruder, a feeding hopper is installed above the rear end of the screw extruder, and a spiral pushing rod is arranged in the screw extruder; a first asynchronous motor is installed at the rear end of the screw extruder, the output end of the first asynchronous motor is in transmission connection with a spiral pushing rod, an extrusion channel is installed at the front end of the screw extruder, a pre-cooling head is installed at the front end of the extrusion channel, and strip-shaped extrusion heads are installed on the upper portion and the lower portion of the interior of the pre-cooling head correspondingly. A plurality of extrusion holes are formed in the strip-shaped extrusion head, a cooling chamber is installed at the front end of the pre-cooling head, a supporting frame is installed below the cooling chamber, and a partition plate is arranged in the middle of the interior of the cooling chamber. According to the scheme, the problems that an existing extruder is of a single-row belt discharging structure, and the machining and pelletizing efficiency is low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of PA66 preparation, and particularly to a granulating device for PA66 chip production and preparation. Background Art

[0002] PA66 is obtained by polycondensation of adipic acid and hexamethylenediamine. In the polycondensation process, first, a 50% aqueous solution of polyamide 66 salt is pumped from a storage tank into a static mixer, and a small amount of acetic acid solution of hexamethylenediamine is added. Then it enters an evaporation reactor, where the material is heated to 232°C and stays for 3 h under nitrogen protection at a pressure of 1.72 MPa for dehydration pre-polycondensation. The water content of the material at the outlet of the evaporation reactor is about 18%, and 50% of the polyamide 66 salt has been polymerized into a low-molecular-weight polymer. The evaporated water vapor is condensed and enters a condensate tank, from which hexamethylenediamine can be recovered. The material coming out of the evaporator enters two parallel tubular reactors. The typical tube length of each reactor is 243.8 m, with static mixers provided at several points and additive inlets set at appropriate positions. The material stays at 285°C for 40 min, the outlet pressure is 0.28 MPa, and 98.5% of the reaction is completed. After removing the water vapor formed and retained in the melt during the reaction by flash evaporation, the melt is conveyed downward to a finished product reactor by a screw conveyor, and at the same time, the remaining water vapor is extruded from the melt. The finished product reactor operates under the conditions of 40 kPa and 271°C. The polyamide 66 melt is extruded by an extruder located at the bottom of the reactor and cast into strips and granulated.

[0003] However, the existing extruder has a single discharge belt structure, and the processing and granulating efficiency is relatively low. Therefore, we provide a granulating device for PA66 chip production and preparation. Summary of the Invention

[0004] The purpose of the present invention is to provide a granulating device for PA66 chip production and preparation, so as to solve the problem that the existing extruder has a single discharge belt structure and the processing and granulating efficiency is relatively low as mentioned in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A granulating device for PA slice production and preparation, including a screw extruder, above the rear end of the screw extruder is installed a feed hopper, inside the screw extruder is provided a spiral pusher rod, at the rear end of the screw extruder is installed a first asynchronous motor, and the output end of the first asynchronous motor is in transmission connection with the spiral pusher rod, at the front end of the screw extruder is installed an extrusion channel, at the front end of the extrusion channel is installed a pre-cooling head, above and below the inside of the pre-cooling head are both installed strip-shaped extrusion heads, inside the strip-shaped extrusion heads are provided a plurality of extrusion holes, at the front end of the pre-cooling head is installed a cooling chamber, below the cooling chamber is installed a support frame, at the middle position inside the cooling chamber is provided a partition board, above and below the partition board are both provided cooling cavities, above the cooling chamber is installed a heat dissipation fan, there are five heat dissipation fans, and the five heat dissipation fans are equally spaced, at the front end of the cooling chamber is installed a granulating box.

[0006] Preferably, a cooling coil is connected between the two strip-shaped extrusion heads, both ends of the cooling coil respectively penetrate to both sides of the pre-cooling head and are connected to a circulating water cooler.

[0007] Preferably, a mesh belt conveyor is installed below the inside of the cooling cavity, on one side of the front end of the cooling chamber is installed a first belt transmission cover, at the lower end inside the first belt transmission cover is installed a first belt pulley, at the upper end inside the first belt transmission cover is installed a second belt pulley, the first belt pulley is in transmission connection with the second belt pulley through a belt, and the wheel shafts on one side of the first belt pulley and the second belt pulley are respectively in transmission connection with the mesh belt conveyors in the two cooling cavities, on the outer wall at the lower end of the first belt transmission cover is installed a second asynchronous motor, and the output end of the second asynchronous motor is in transmission connection with the wheel shaft on the other side of the first belt pulley.

[0008] Preferably, a dust-proof air inlet net is installed on the upper surface of the cooling fan, a fan transmission cover is installed above the dust-proof air inlet net, a first steering chamber is installed on the outer wall of the upper end of the first belt transmission cover, the wheel shaft on the other side of the second pulley penetrates and extends into the interior of the first steering chamber, and a first bevel gear is installed. A second bevel gear is installed on the outer side of the first bevel gear, a first transmission shaft is installed at the upper end of the second bevel gear, and the upper end of the first transmission shaft penetrates to the outside of the first steering chamber. A second steering chamber is installed at the upper end of the first transmission shaft. The end of the first transmission shaft extends into the interior of the second steering chamber, and a third bevel gear is installed. A positioning bearing is installed at the connection between the first transmission shaft and the first steering chamber and the second steering chamber through a speed change gear set. A fourth bevel gear is installed on the inner side of the third bevel gear. The fourth bevel gear, a third transmission shaft is installed on the inner side of the fourth bevel gear. The outer wall of the third transmission shaft is connected to the inner wall of the second steering chamber through a cage. A fifth bevel gear is installed at the end of the third transmission shaft. A sixth bevel gear is installed at the rear end of the fifth bevel gear in a meshing manner. A second transmission shaft is installed at the rear end of the sixth bevel gear. The second transmission shaft sequentially penetrates the fan transmission covers at the upper ends of the five cooling fans, and a bearing seat is installed at the end. Five worm segments are arranged on the second transmission shaft, and the five worm segments are respectively located inside the five fan transmission covers. A worm gear is installed inside the fan transmission cover. The worm gear shaft is connected to the fan of the cooling fan through a speed change gear set, and the worm gear is in meshing transmission connection with the worm segment. The lower end of the second asynchronous motor is installed with a motor support, and the motor support is fixedly connected to the second asynchronous motor.

[0009] Preferably, connection frames are installed on both sides of the inner wall of the cooling cavity. There are multiple connection frames, and the connection frames on both sides are arranged oppositely. Guide rollers are installed between the connection frames on both sides.

[0010] Preferably, air-permeable nets are installed on the lower surface of the cooling chamber and inside the partition board. Air guiding plates are arranged on both sides at the upper end inside the cooling chamber. C-shaped air guiding frames are installed on both sides of the cooling chamber, and both ends of the C-shaped air guiding frames are respectively communicated with the two cooling cavities.

[0011] Preferably, belt outlets are arranged above and below the front end face of the cooling chamber. There are two belt outlets, and the two belt outlets are arranged oppositely. A pressure-receiving platform is arranged at the bottom of the front end of the belt outlet, and a loading platform is arranged at the top of the front end of the belt outlet. An electric push rod is installed at the upper end of the loading platform, and a pressure roller is installed at the lower end of the loading platform. The output end of the electric push rod is in transmission connection with the pressure roller.

[0012] Preferably, the lower end of the second steering chamber is fixedly connected to the cooling chamber through a bracket.

[0013] Preferably, an electric heating ceramic jacket is installed on the outer wall of the extrusion channel, and a plurality of electric heating ceramic jackets are provided and are evenly distributed.

[0014] Preferably, a cover plate is installed below the front end of the pelletizing box, the upper end of the cover plate is rotatably connected to the pelletizing box by a hinge, a handle is installed on the outer wall of the lower end of the cover plate, a second belt drive cover is installed above the front end of the pelletizing box, a third asynchronous motor is installed on the outer wall of the second belt drive cover, a rotating shaft is installed above the interior of the pelletizing box, a pelletizing blade is installed at one end of the rotating shaft, the output end of the third asynchronous motor is transmission-connected to the rotating shaft through a belt drive mechanism in the second belt drive cover, and a storage box is provided below the interior of the pelletizing box.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention arranges two groups of strip extrusion heads distributed up and down at the front end of the extruder. The two groups of strip extrusion heads can extrude the molten belt synchronously, and are respectively transported by mesh belt conveyors in two cooling chambers in the cooling chamber, and are cooled by top-mounted downward induced air cooling, and then synchronous slicing is achieved by the blades in the pelletizing box, thereby solving the problem that the existing extruder has a single-discharge belt structure and low processing and pelletizing efficiency.

[0017] 2. The two groups of mesh belt conveyors of the present invention are synchronously driven by the second asynchronous motor and the belt transmission structure. In the transmission process, the belt transmission structure can further drive the heat dissipation fan above the cooling chamber to operate through the cooperation of the bevel gear group, the worm gear segment and the speed gear. The cooling of the molten belts in the two cooling chambers is achieved by relying on the downward air-inducing blowing structure. The entire cooling chamber system shares a power source, which reduces energy consumption while ensuring work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the local structure of the cooling chamber of the present invention;

[0020] Figure 3 It is a schematic diagram of the bottom structure of the cooling chamber of the present invention;

[0021] Figure 4 It is a schematic diagram of the end structure of the screw extruder of the present invention;

[0022] Figure 5 It is a schematic diagram of the internal structure of the pelletizing box of the present invention;

[0023] Figure 6 It is a schematic diagram of the transmission structure of the first steering chamber and the second steering chamber of the present invention;

[0024] Figure 7 Schematic top view structure of the cooling chamber of the present invention;

[0025] Figure 8 Schematic end face structure of the cooling chamber of the present invention:

[0026] In the figure: 1, screw extruder; 2, extrusion channel; 3, electric heating ceramic jacket; 4, feed hopper; 5, first asynchronous motor; 6, cooling chamber; 7, support frame; 8, heat dissipation fan; 9, dust-proof air inlet net; 10, fan drive cover; 11, C-shaped air guide frame; 12, first belt drive cover; 121, first pulley; 122, second pulley; 123, belt; 13, second asynchronous motor; 14, motor support; 15, granulation box; 16, second belt drive cover; 17, third asynchronous motor; 18, cover plate; 19, hinge; 20, handle; 21, first steering chamber; 22, first transmission shaft; 23, second steering chamber; 24, bracket; 25, second transmission shaft; 26, bearing seat; 27, partition board; 28, cooling cavity; 29, mesh belt conveyor; 30, air guide plate; 31, connecting frame; 32, guide roller; 33, ventilation net; 34, pre-cooling head; 35, strip extrusion head; 36, extrusion hole; 37, cooling coil; 38, granulation blade; 39, rotating shaft; 40, storage box; 41, first bevel gear; 42, second bevel gear; 43, third bevel gear; 44, fourth bevel gear; 45, third transmission shaft; 46, cage; 47, fifth bevel gear; 48, sixth bevel gear; 49, worm segment; 50, worm wheel; 51, belt outlet; 52, pressure receiving platform; 53, carrier platform; 54, electric push rod; 55, pressure roller. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] Please refer to Figure 1-8, an embodiment provided by the present invention: a granulating device for the production and preparation of PA66 chips, including a screw extruder 1, a feeding hopper 4 is installed above the rear end of the screw extruder 1, a spiral feeding rod is arranged inside the screw extruder 1, a first asynchronous motor 5 is installed at the rear end of the screw extruder 1, and the output end of the first asynchronous motor 5 is in transmission connection with the spiral feeding rod. The front end of the screw extruder 1 is installed with an extrusion channel 2, a pre-cooling head 34 is installed at the front end of the extrusion channel 2, strip-shaped extrusion heads 35 are installed above and below the inside of the pre-cooling head 34, a plurality of extrusion holes 36 are arranged inside the strip-shaped extrusion heads 35, a cooling chamber 6 is installed at the front end of the pre-cooling head 34, a support frame 7 is installed below the cooling chamber 6, a partition plate 27 is arranged at the middle position inside the cooling chamber 6, cooling cavities 28 are arranged above and below the partition plate 27, a heat dissipation fan 8 is installed above the cooling chamber 6, there are five heat dissipation fans 8, and the five heat dissipation fans 8 are equidistantly distributed. A granulating box 15 is installed at the front end of the cooling chamber 6.

[0029] Please refer to Figure 4 , a cooling coil 37 is connected between the two strip-shaped extrusion heads 35, both ends of the cooling coil 37 respectively penetrate to both sides of the pre-cooling head 34 and are connected with a circulating water cooler. Each extrusion hole 36 on the strip-shaped extrusion head 35 can extrude the PA66 melt in a strip-shaped band. When extruding, the circulating water cooler pumps cooling water into the cooling coil 37 to pre-cool the PA66 melt to make it initially formed.

[0030] Please refer to Figure 2 , a mesh belt conveyor 29 is installed below the inside of the cooling cavity 28, a first belt transmission cover 12 is installed on one side of the front end of the cooling chamber 6, a first belt pulley 121 is installed at the lower end inside the first belt transmission cover 12, a second belt pulley 122 is installed at the upper end inside the first belt transmission cover 12, the first belt pulley 121 is in transmission connection with the second belt pulley 122 through a belt 123, and the axle shafts on one side of the first belt pulley 121 and the second belt pulley 122 are respectively in transmission connection with the mesh belt conveyors 29 in the two cooling cavities 28. A second asynchronous motor 13 is installed on the outer wall at the lower end of the first belt transmission cover 12, and the output end of the second asynchronous motor 13 is in transmission connection with the axle shaft on the other side of the first belt pulley 121. The second asynchronous motor 13 is a high-power motor. When its output end drives the first belt pulley 121 to rotate, the first belt pulley 121 can be in transmission with the second belt pulley 122 through the belt 123, so as to synchronously drive the upper and lower groups of mesh belt conveyors 29 to operate through the axle shafts of the first belt pulley 121 and the second belt pulley 122, realizing the conveying of the molten belt.

[0031] Please refer to Figure 2 , Figure 6 and Figure 7, a dust-proof air inlet net 9 is installed on the upper surface of the cooling fan 8, a fan transmission cover 10 is installed above the dust-proof air inlet net 9, a first steering chamber 21 is installed on the outer wall of the upper end of the first belt transmission cover 12, the wheel shaft on the other side of the second pulley 122 penetrates and extends into the interior of the first steering chamber 21, and a first bevel gear 41 is installed. A second bevel gear 42 is installed on the outer side of the first bevel gear 41 in a meshing manner. A first transmission shaft 22 is installed at the upper end of the second bevel gear 42, and the upper end of the first transmission shaft 22 penetrates to the outside of the first steering chamber 21. A second steering chamber 23 is installed at the upper end of the first transmission shaft 22. The end of the first transmission shaft 22 extends into the interior of the second steering chamber 23, and a third bevel gear 43 is installed. Positioning bearings are installed at the connection points of the first transmission shaft 22 with the first steering chamber 21 and the second steering chamber 23. A fourth bevel gear 44 is installed on the inner side of the third bevel gear 43. The inner side of the fourth bevel gear 44, the fourth bevel gear 44, a third transmission shaft 45 is installed on the inner side of the fourth bevel gear 44. The outer wall of the third transmission shaft 45 is connected to the inner wall of the second steering chamber 23 through a cage 46. A fifth bevel gear 47 is installed at the end of the third transmission shaft 45. A sixth bevel gear 48 is installed in a meshing manner at the rear end of the fifth bevel gear 47. A second transmission shaft 25 is installed at the rear end of the sixth bevel gear 48. The second transmission shaft 25 sequentially penetrates through the fan transmission covers 10 at the upper ends of the five cooling fans 8, and a bearing seat 26 is installed at the end. Five worm segments 49 are arranged on the second transmission shaft 25, and the five worm segments 49 are respectively located inside the five fan transmission covers 10. A worm gear 50 is installed inside the fan transmission cover 10. The worm gear 50 shaft is in transmission connection with the fan of the cooling fan 8 through a speed change gear set (not shown in the figure), and the worm gear 50 is in meshing transmission connection with the worm segment 49. The lower end of the second asynchronous motor 13 is installed with a motor support 14, and the motor support 14 is fixedly connected to the second asynchronous motor 13. When the second pulley 122 is in transmission, the first bevel gear 41 at the end of the wheel shaft on the other side can be in meshing transmission with the second bevel gear 42, driving the third bevel gear 43 at the end of the first transmission shaft 22 to rotate. By using the meshing transmission between the third bevel gear 43 and the fourth bevel gear 44, the fifth bevel gear 47 at the end of the third transmission shaft 45 on the inner side of the fourth bevel gear 44 is in meshing transmission with the sixth bevel gear 48. By using the worm segment 49 on the second transmission shaft 25 at the rear end of the sixth bevel gear 48, it is in transmission with the worm gear 50 on the cooling fan 8. The worm gear 50 drives the fan of the cooling fan 8 to increase speed through a speed change gear set, realizing the operation of the cooling fan 8, and cooperating with the conveying of the molten belt by the mesh belt conveyor 29 to achieve air-cooling and temperature reduction.

[0032] Please refer to Figure 2 , connection frames 31 are installed on both sides of the inner wall of the cooling chamber 28. There are multiple connection frames 31, and the connection frames 31 on both sides are arranged oppositely. A guide roller 32 is installed between the connection frames 31 on both sides. When the mesh belt conveyor 29 conveys the molten belt, the guide roller 32 can limit the molten belt from above, playing a role of auxiliary guidance and improving the stability of the molten belt conveying.

[0033] Please refer to Figure 2 and Figure 3 , ventilation nets 33 are installed on the lower surface of the cooling chamber 6 and inside the partition plate 27. Air guiding plates 30 are arranged on both sides at the upper end inside the cooling chamber 6. C-shaped air guiding frames 11 are installed on both sides of the cooling chamber 6, and both ends of the C-shaped air guiding frame 11 are respectively communicated with two cooling chambers 28. The cooling fan 8 uses a top-down blowing type refrigeration. During the process, most of the air is blown downward from the middle to cool the molten belt on the upper belt conveyor 29, and passes through the mesh holes of the belt conveyor 29 and the ventilation net 33 of the partition plate 27 to the lower belt conveyor 29 to cool the molten belt on its surface. To ensure the cooling effect of the lower molten belt, air guiding plates 30 are arranged on both sides at the upper end inside the cooling chamber 6, which can directly introduce part of the air into the C-shaped air guiding frames 11 on both sides when the air enters the upper cavity, and the C-shaped air guiding frame 11 sends the cooling air into the lower cavity, thus ensuring the cooling effect of the lower molten belt.

[0034] Please refer to Figure 8 , discharge openings 51 are arranged above and below the front end face of the cooling chamber 6. There are two discharge openings 51, and the two discharge openings 51 are arranged opposite to each other. A pressure-receiving platform 52 is arranged at the bottom of the front end of the discharge opening 51, and a loading platform 53 is arranged at the top of the front end of the discharge opening 51. An electric push rod 54 is installed at the upper end of the loading platform 53, and a pressure roller 55 is installed at the lower end of the loading platform 53, and the output end of the electric push rod 54 is in transmission connection with the pressure roller 55. The molten belt is sent out along the discharge opening 51 under the conveying action of the belt conveyor 29. A pressure roller 55 controlled by the electric push rod 54 is arranged at the discharge opening 51, which can ensure the stability of belt discharging.

[0035] Please refer to Figure 2 , the lower end of the second turning chamber 23 is fixedly connected to the cooling chamber 6 through a bracket 24.

[0036] Please refer to Figure 1 , electric heating ceramic jackets 3 are installed on the outer wall of the extrusion channel 2. There are multiple electric heating ceramic jackets 3, and the multiple electric heating ceramic jackets 3 are equidistantly distributed. The temperature of the electric heating ceramic jackets 3 gradually increases from the discharge opening 51 to the feed hopper 4 direction, which can gradually cool the melt while ensuring the fluidity of the melt.

[0037] Please refer to Figure 1 and Figure 5, a cover plate 18 is installed below the front end of the pelletizing box 15. The upper end of the cover plate 18 is rotatably connected to the pelletizing box 15 through a hinge 19. A handle 20 is installed on the outer wall of the lower end of the cover plate 18. A second belt transmission cover 16 is installed above the front end of the pelletizing box 15. A third asynchronous motor 17 is installed on the outer wall of the second belt transmission cover 16. A rotating shaft 39 is installed above the inside of the pelletizing box 15. A pelletizing blade 38 is installed at one end of the rotating shaft 39. The output end of the third asynchronous motor 17 is connected to the rotating shaft 39 through a belt transmission mechanism inside the second belt transmission cover 16. A storage box 40 is arranged below the inside of the pelletizing box 15. The output end of the third asynchronous motor 17 can be transmitted to the pelletizing blade 38 through a belt transmission structure. The molten belt extending from the belt outlet 51 can be cut into pieces under the action of the pelletizing blade 38 and fall into the storage box 40 for temporary storage.

[0038] Working principle: The PA66 molten material is sent into the screw extruder 1 along the feeding hopper 4 by the screw conveyor. The screw extruder 1 pushes the molten material towards the front end of the extruder through the internal screw pushing rod. There are two sets of strip-shaped extrusion heads 35 distributed vertically at the front end of the extruder. Each extrusion hole 36 on the strip-shaped extrusion head 35 can extrude the PA66 melt in a strip shape. When extruding, the circulating water cooler pumps cooling water into the cooling coil 37 to pre-cool the PA66 melt to make it initially formed. The molten belts extruded by the upper and lower two sets of strip-shaped extrusion heads 35 respectively enter the two cooling chambers 28 of the cooling chamber 6 and are continuously conveyed to the end of the cooling chamber 6 by the mesh belt conveyor 29 in the cooling chamber 28. The two mesh belt conveyors 29 are synchronously driven by the second asynchronous motor 13 in cooperation with the belt transmission structure. During the transmission process, the belt transmission structure can further drive the cooling fan 8 above the cooling chamber 6 to operate through the cooperation of the bevel gear set with the worm section 49 of the worm wheel 50 and the transmission gear. Relying on the downward air draft blowing structure, the cooling of the molten belts in the two cooling chambers 28 is realized. By adopting the top-down blowing structure, the molten belts can be stably placed on the surface of the mesh belt conveyor 29 to ensure the stability of the feeding. The cooled molten belts are sent out along the belt outlet 51 under the conveying action of the mesh belt conveyor 29. A pressure roller 55 controlled by an electric push rod 54 is arranged at the belt outlet 51 to ensure the stability of the belt output. The molten belt sent out from the belt outlet 51 can be cut into pieces under the action of the pelletizing blade 38 and fall into the storage box 40 for temporary storage. The storage box 40 and the pelletizing box 15 are of a split structure. The cover plate 18 of the pelletizing box 15 can be flipped open to quickly take out the stored material.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A pelletizing device for the production and preparation of PA66 chips, including a screw extruder (1), above the rear end of the screw extruder (1) is installed a feed hopper (4), inside the screw extruder (1) is provided with a spiral feeding rod, the rear end of the screw extruder (1) is installed with a first asynchronous motor (5), and the output end of the first asynchronous motor (5) is in transmission connection with the spiral feeding rod, characterized in that: A extrusion channel (2) is installed at the front end of the screw extruder (1). A pre-cooling head (34) is installed at the front end of the extrusion channel (2). Strip-shaped extrusion heads (35) are installed above and below the interior of the pre-cooling head (34). A plurality of extrusion holes (36) are provided inside the strip-shaped extrusion heads (35). A cooling chamber (6) is installed at the front end of the pre-cooling head (34). A support frame (7) is installed below the cooling chamber (6). A partition plate (27) is provided at the middle position inside the cooling chamber (6). Cooling cavities (28) are provided above and below the partition plate (27). A heat dissipation fan (8) is installed above the cooling chamber (6). There are five heat dissipation fans (8), and the five heat dissipation fans (8) are equidistantly distributed. A granulation box (15) is installed at the front end of the cooling chamber (6).

2. The pelletizing equipment for the production and preparation of PA66 chips according to claim 1, characterized in that: A cooling coil pipe (37) is connected between the two strip-shaped extrusion heads (35). Two ends of the cooling coil pipe (37) respectively penetrate through both sides of the pre-cooling head (34) and are connected to a circulating water cooler.

3. A pelletizing device for the production and preparation of PA66 chips according to claim 2, characterized in that: A mesh belt conveyor (29) is installed below the interior of the cooling cavity (28). A first belt transmission cover (12) is installed on one side of the front end of the cooling chamber (6). A first belt pulley (121) is installed at the lower end inside the first belt transmission cover (12). A second belt pulley (122) is installed at the upper end inside the first belt transmission cover (12). The first belt pulley (121) is in transmission connection with the second belt pulley (122) through a belt (123). Axles on one side of the first belt pulley (121) and the second belt pulley (122) are respectively in transmission connection with the mesh belt conveyors (29) inside the two cooling cavities (28). A second asynchronous motor (13) is installed on the outer wall at the lower end of the first belt transmission cover (12), and an output end of the second asynchronous motor (13) is in transmission connection with the axle on the other side of the first belt pulley (121).

4. A pelletizing device for the production and preparation of PA66 chips according to claim 3, characterized in that: A dust-proof air inlet net (9) is installed on the upper surface of the cooling fan (8). A fan transmission cover (10) is installed above the dust-proof air inlet net (9). A first steering chamber (21) is installed on the outer wall at the upper end of the first belt transmission cover (12). The axle on the other side of the second pulley (122) penetrates and extends into the interior of the first steering chamber (21), and a first bevel gear (41) is installed. A second bevel gear (42) is installed on the outer side of the first bevel gear (41) in a meshing manner. The upper end of the second bevel gear (42) is provided with a first transmission shaft (22), and the upper end of the first transmission shaft (22) penetrates to the outside of the first steering chamber (21). A second steering chamber (23) is installed at the upper end of the first transmission shaft (22). The end of the first transmission shaft (22) extends into the interior of the second steering chamber (23), and a third bevel gear (43) is installed. Positioning bearings are installed at the connection positions of the first transmission shaft (22) with the first steering chamber (21) and the second steering chamber (23). A fourth bevel gear (44) is installed on the inner side of the third bevel gear (43). The fourth bevel gear (44), the inner side of the fourth bevel gear (44) is provided with a third transmission shaft (45). The outer wall of the third transmission shaft (45) is connected to the inner wall of the second steering chamber (23) through a cage (46). The end of the third transmission shaft (45) is provided with a fifth bevel gear (47). A sixth bevel gear (48) is installed on the rear end of the fifth bevel gear (47) in a meshing manner. The rear end of the sixth bevel gear (48) is provided with a second transmission shaft (25). The second transmission shaft (25) sequentially penetrates through the fan transmission covers (10) at the upper ends of five cooling fans (8), and a bearing seat (26) is installed at the end. Five worm segments (49) are arranged on the second transmission shaft (25), and the five worm segments (49) are respectively located inside the five fan transmission covers (10). A worm gear (50) is installed inside the fan transmission cover (10). The worm gear (50) shaft is in transmission connection with the fan of the cooling fan (8) through a speed change gear set, and the worm gear (50) is in meshing transmission connection with the worm segment (49). The lower end of the second asynchronous motor (13) is provided with a motor support (14), and the motor support (14) is fixedly connected to the second asynchronous motor (13).

5. The pelletizing equipment for the production and preparation of PA66 chips according to claim 4, characterized in that: Connection frames (31) are installed on both sides of the inner wall of the cooling cavity (28). There are multiple connection frames (31), and the connection frames (31) on both sides are arranged oppositely. Guide rollers (32) are installed between the connection frames (31) on both sides.

6. The pelletizing equipment for the production and preparation of PA66 chips according to claim 5, characterized in that: Ventilation nets (33) are installed on the lower surface of the cooling chamber (6) and inside the partition plate (27). Air guiding plates (30) are arranged on both sides at the upper end inside the cooling chamber (6). C-shaped air guiding frames (11) are installed on both sides of the cooling chamber (6), and both ends of the C-shaped air guiding frames (11) are respectively communicated with the two cooling cavities (28).

7. A pelletizing device for the production and preparation of PA66 chips according to claim 6, characterized in that: Above and below the front end face of the cooling chamber (6), there are discharge openings (51) provided. There are two discharge openings (51), and the two discharge openings (51) are arranged oppositely. At the bottom of the front end of the discharge opening (51), there is a pressure-receiving platform (52). At the top of the front end of the discharge opening (51), there is a carrier platform (53). An electric push rod (54) is installed at the upper end of the carrier platform (53), and a pressure roller (55) is installed at the lower end of the carrier platform (53). The output end of the electric push rod (54) is in transmission connection with the pressure roller (55).

8. A granulation device for the production and preparation of PA66 chips according to claim 7, characterized in that: The lower end of the second turning chamber (23) is fixedly connected to the cooling chamber (6) through a bracket (24).

9. A granulating device for the production and preparation of PA66 chips according to claim 8, characterized in that: On the outer wall of the extrusion channel (2), there are multiple electric heating ceramic jackets (3) installed, and the multiple electric heating ceramic jackets (3) are equidistantly distributed.

10. A pelletizing device for the production and preparation of PA66 chips according to claim 9, characterized in that: Below the front end of the granulation box (15), there is a cover plate (18) installed. The upper end of the cover plate (18) is rotatably connected to the granulation box (15) through a hinge (19). A handle (20) is installed on the outer wall of the lower end of the cover plate (18). Above the front end of the granulation box (15), there is a second belt transmission cover (16). A third asynchronous motor (17) is installed on the outer wall of the second belt transmission cover (16). Above the inside of the granulation box (15), there is a rotating shaft (39) installed. A granulation blade (38) is installed at one end of the rotating shaft (39). The output end of the third asynchronous motor (17) is in transmission connection with the rotating shaft (39) through a belt transmission mechanism inside the second belt transmission cover (16). Below the inside of the granulation box (15), there is a storage box (40).

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