Polylactic acid bamboo fiber composite material granulation production line

Abstract

The present invention relates to a granulation production line of polylactic acid bamboo fiber composite material. It solves the technical problems of unreasonable design in the prior art. The granulation production line of polylactic acid bamboo fiber composite material comprises a conveying channel, a feeding screw arranged in the conveying channel, and a heating mechanism for heating the conveying channel. An extrusion die and a pelletizing device located behind the extrusion die are connected to the discharge end of the conveying channel. A main feeding device is connected to the feed end of the conveying channel. A bamboo fiber feeding device is connected to the side between the middle of the conveying channel and the discharge end. The production line also comprises a cooling device located between the extrusion die and the pelletizing device. The cooling device is used to cool the continuous strip material extruded by the extrusion die and feed the continuous strip material into the pelletizing device for pelletizing. The advantages of the present invention are that it can prevent the bamboo fiber material from being carbonized due to long-term high-temperature heating in the conveying channel, thereby improving the product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material processing, and in particular relates to a granulation production line of a polylactic acid bamboo fiber composite material. Background Art

[0002] Polylactic acid, bamboo fiber and auxiliary materials can be mixed to produce environmentally friendly materials, which are used in various tableware and other food fields.

[0003] When various materials are mixed, currently the materials are mixed in one place and then heated to obtain the final composite material.

[0004] The heating is carried out in the transmission channel. The above-mentioned mixing will cause the bamboo fiber material to be carbonized due to the high-temperature heating in the transmission spiral channel, thereby destroying the original properties of the bamboo fiber.

[0005] Secondly, for the cooling of continuous extrudates, the cooling efficiency needs to be further improved. Summary of the invention

[0006] The purpose of the present invention is to provide a granulation production line for polylactic acid bamboo fiber composite materials that can solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the granulation production line of the polylactic acid bamboo fiber composite material includes a conveying channel, a feeding screw penetrating in the conveying channel, and a heating mechanism for heating the conveying channel; an extrusion die is connected to the discharge end of the conveying channel, and a pelletizing device is located behind the extrusion die; a main feeding device is connected to the feed end of the conveying channel; a bamboo fiber feeding device is connected to the side between the middle of the conveying channel and the discharge end; the production line also includes a cooling device located between the extrusion die and the pelletizing device, the cooling device is used to cool the continuous strip material extruded by the extrusion die and feed the continuous strip material into the pelletizing device for pelletizing.

[0008] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the cooling device includes a cooling water trough for receiving the continuous strip material extruded by the extrusion die, a plurality of guide rollers are provided on the cooling water trough, and a plurality of annular guide grooves are provided on each guide roller at intervals, at least one of the plurality of guide rollers is immersed in the cooling water of the cooling water trough, and the remaining guide rollers are located above the normal cooling water level of the cooling water trough.

[0009] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the cooling device also includes an air cooling trough located at one end of the cooling water trough away from the extrusion die, and the air cooling trough is connected to two guide rollers 2 located in the same horizontal plane, and each guide roller 2 is respectively provided with a plurality of annular guide grooves 2 distributed at intervals, and the air cooling trough is also connected to a cooling air hood located on the upper side between the two guide rollers 2, and the air outlet of the cooling air hood faces the guide roller 2 and blows air downward.

[0010] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the cooling air hood is connected to the upper end of the vertically arranged air inlet pipe, the air cooling trough is installed at the upper end of the air inlet pipe and located below the cooling air hood, and the lower end of the air inlet pipe is connected to a blower, which is fixed on a fixed bracket.

[0011] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the heating mechanism includes a steam pipe surrounding the outer wall of the conveying channel, the steam pipe is connected to the steam source, and a protective sleeve is sleeved on the outside of the conveying channel, and the steam pipe is located between the conveying channel and the protective sleeve.

[0012] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the granulation device includes a material receiving channel for receiving the cooled continuous strip material, an inner cone is provided inside the discharge end of the material receiving channel, the large inner diameter end of the inner cone is the feed end, and the small inner diameter end is the discharge end, a granulation cutter is connected to the small inner diameter end of the inner cone, and the granulation cutter is connected to the granulation motor through a belt drive structure.

[0013] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the main feeding device includes a feed hopper 2 arranged on the upper side of the feed end of the conveying channel and connected by a plurality of columns, the lower end of the feed hopper 2 is closed, the upper end of the feed hopper 2 is open, a discharge pipe is connected to one side of the lower end of the feed hopper 2, and a vertical hopper connected to the discharge end of the discharge pipe, the lower end of the vertical hopper is connected to the conveying channel, a screw 1 is passed through the feed hopper 2 and the screw 1 extends into the discharge pipe, and the screw 1 is connected to a feeding motor 1.

[0014] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the bamboo fiber feeding device includes a support frame, a horizontally arranged discharge trough is provided on the support frame, the discharge end of the discharge trough is connected to the side between the middle part and the discharge end and is connected to the conveying channel, a spiral discharge mechanism is provided in the discharge trough, and a guide cylinder is located above the side of the discharge trough, the upper end of the guide cylinder is open and a feed hopper is connected to the open end of the guide cylinder, a horizontally arranged discharge cylinder is connected to one side of the guide cylinder, and two screws inserted in the discharge cylinder are inserted into the discharge cylinder. An extrusion screw and one end of the extrusion screw extends into the guide barrel and is rotatably connected to the guide barrel. The two extrusion screws are in the same horizontal plane and rotate in the same direction. A drop hopper is connected to the discharge end of the discharge barrel, and the lower end of the drop hopper is connected to the upper side of the feed end of the discharge trough. A material-prying shaft located above the extrusion screw is connected to the guide barrel, and one end of the material-prying shaft extends to the bottom of the feed hopper. The material-prying shaft and the extrusion screw are connected to the same power drive mechanism, and a material-prying piece is connected to the end of the material-prying shaft extended to the bottom of the feed hopper.

[0015] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the material-dispensing shaft is located above the center between the two extrusion screws.

[0016] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the power drive mechanism includes a box body fixed on the top of the support frame, one end of the extrusion screw extends into the box body and the extrusion screw and the box body are rotatably connected, the other end of the material diverter shaft extends into the box body and the material diverter shaft and the box body are rotatably connected, one end of the extrusion screw extending into the box body and the other end of the material diverter shaft are connected through a linkage structure, and any one of the extrusion screws is connected to the power drive motor.

[0017] The linkage structure comprises a gear 1 arranged at one end of each extrusion screw extending into the box body, the two gears 1 are meshed with each other, and a gear 2 meshed with any one of the gears 1 is arranged at the other end of the material-dispensing shaft.

[0018] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the material shifting piece is Z-shaped, the material shifting shaft rotates to drive the material shifting piece to rotate synchronously, and any end of the material shifting piece intermittently extends into the lower end of the feed hopper.

[0019] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the material-dispensing shaft is located above the center between the two extrusion screws.

[0020] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the support frame includes a base, a horizontal plate one connected to the top of the base, a horizontal plate two connected to the horizontal plate one through four connecting columns one, a horizontal plate three connected to the horizontal plate two through four connecting columns two, the discharge chute and the spiral discharge mechanism are fixed on the upper surface of the horizontal plate two, and the guide cylinder and the power drive mechanism are fixed on the upper surface of the horizontal plate three.

[0021] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the spiral discharging mechanism includes a spiral discharging rod inserted in the discharging trough, a fixed box fixed on the second horizontal plate, and a screw protection tube connected between the fixed box and the discharging trough. A servo motor and a reducer connected to the output shaft of the servo motor are connected to the base. The reducer is fixed on the side of the fixed box away from the screw protection tube. The end of the spiral discharging rod close to the screw protection tube is connected to a transmission shaft, and the transmission shaft and the reducer are connected.

[0022] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the open end of the guide barrel has a lower flange, and the lower end of the feed hopper is connected with an upper flange, the upper flange is placed on the lower flange and the upper flange and the lower flange are fixed together by a plurality of bolts.

[0023] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the horizontal plate one, horizontal plate two and horizontal plate three are all rectangular plates, one end of horizontal plate one is fixed to the top of the base, the other end of horizontal plate one is suspended, the periphery of horizontal plate two is flush with the periphery of horizontal plate one, one end of horizontal plate three is located above the middle part of horizontal plate two, and the other end of horizontal plate three is extended to the outside of the end of horizontal plate two away from the suspended end of horizontal plate one.

[0024] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, there are four columns distributed in an array, the feed hopper 2 is fixed on the feed bottom plate, and the feed bottom plate is fixed on the upper ends of the four columns.

[0025] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, an observation glass 1 is connected to the side of the feed hopper 2 connected to the discharge pipe.

[0026] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, a feeding funnel is connected to the open portion of the second feeding hopper.

[0027] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, an observation glass 2 is connected to the feed funnel.

[0028] In the above-mentioned polylactic acid bamboo fiber composite material granulation production line, the extrusion mold includes a mold body with a material cavity, a feed port connected to the conveying channel is provided on one side of the mold body, and a plurality of horizontal extrusion holes are provided on the other side of the mold body opposite to the side with the feed port.

[0029] Compared with the existing technology, the advantages of this polylactic acid bamboo fiber composite material granulation production line are:

[0030] The main raw materials are fed through a feed hopper, and the discharge of the bamboo fiber feeding device is set on the side of the bamboo fiber feeding device. This structure can achieve the purpose of mixing. At the same time, it can also prevent the bamboo fiber material from being carbonized due to long-term high-temperature heating in the conveying channel, thereby improving the product quality; at the same time, since the path through the conveying channel is shortened, the amount of bamboo fiber added can be increased, thereby reducing the cost of producing the main material.

[0031] By adopting the above-mentioned cooling device, it is possible to achieve rapid and thorough cooling, thereby virtually improving the cooling efficiency and pelletizing quality, and avoiding the phenomenon of large burrs in pelletizing due to inadequate cooling.

[0032] The rotation of the material-shifting piece can prevent the interruption of the supply of the bamboo fiber material, and the extrusion screw has a small shear force, which can prevent the bamboo fiber material from being squeezed and causing damage and decomposition of the bamboo fiber material, and can form a one-time mixing of the bamboo fiber material. At the same time, the height difference is used to make the bamboo fiber material enter the discharge trough, which can form a broken up bamboo fiber material, and finally a quantitative feeding is formed through the spiral discharge mechanism. The whole structure can improve the feeding efficiency and feeding quality of the bamboo fiber material. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a simplified schematic diagram of a granulation production line of a polylactic acid bamboo fiber composite material provided by the present invention.

[0034] Figure 2 It is a schematic diagram of the structure of the extrusion die provided by the present invention.

[0035] Figure 3 It is a schematic diagram of the structure of the pelletizing device provided by the present invention.

[0036] Figure 4 It is a structural schematic diagram of the main feeding device provided by the present invention.

[0037] Figure 5 It is a structural schematic diagram of the main feeding device provided by the present invention from another viewing angle.

[0038] Figure 6 It is a structural schematic diagram of the bamboo fiber feeding device provided by the present invention.

[0039] Figure 7 It is a partial structural schematic diagram of the material guide barrel provided by the present invention.

[0040] Figure 8 It is a schematic diagram of the feeding state of the granulation production line of the polylactic acid bamboo fiber composite material provided by the present invention.

[0041] Fig. 9 It is a schematic diagram of the cooling water tank structure provided by the present invention.

[0042] Fig.10It is a schematic diagram of the structure of the air cooling slot provided by the present invention.

[0043] Fig.11 It is a schematic diagram of the transverse cross-sectional structure of the cooling air hood provided by the present invention.

[0044] Fig.12 It is a partial structural schematic diagram of the rotating ring provided by the present invention.

[0045] Fig.13 The present invention provides Fig.12 Enlarged structural diagram at B in the middle.

[0046] In the figure, bamboo fiber feeding device a, support frame a1, base a10, horizontal plate one a11, connecting column one a12, horizontal plate two a13, connecting column two a14, horizontal plate three a15, discharging trough a2, spiral discharging mechanism a3, spiral discharging rod a30, fixing box a31, screw protection tube a32, servo motor a33, reducer a34, transmission shaft a35, guide barrel a4, lower flange a40, material diverting shaft a41, material diverting sheet a42, feed hopper one a5, upper flange a50, discharging barrel a6, extruding screw a7, dropping hopper a8, power drive mechanism a9, box a91, power drive motor a92, conveying channel b1, Column b10, feed hopper 2 b11, discharge pipe b12, vertical hopper b13, screw 1 b14, feeding motor 1 b15, feeding bottom plate b16, observation glass 1 b17, feed funnel b18, observation glass 2 b19, feeding screw b2, extrusion die c, die body c1, horizontal extrusion hole c10, pelletizing device d, material receiving channel d1, inner cone d2, pelletizing cutter d3, pelletizing motor d4, cooling device e, cooling water trough e1, guide roller 1 e2, annular guide groove 1 e20, wind cooling groove e3, guide roller 2 e4, annular guide groove 2 e40, cooling air hood e5, air inlet pipe e6, blower e7, fixed bracket e8. DETAILED DESCRIPTION

[0047] The following are specific embodiments of the invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0048] like Figure 1As shown, the granulation production line of the polylactic acid bamboo fiber composite material includes a conveying channel b1, and a feeding screw b2 passing through the conveying channel b1, the feeding screw b2 is connected to the feeding main motor, of course, in order to improve the rotation stability of the feeding screw b2, a gear box is connected to the output shaft of the feeding main motor, the feeding screw b2 is connected to the gear box, and a heating mechanism for heating the conveying channel b1, the heating mechanism includes a steam pipe surrounding the outer wall of the conveying channel b1, the steam pipe is connected to a steam source, and a protective sleeve is sleeved on the outside of the conveying channel b1, and the steam pipe is located between the conveying channel b1 and the protective sleeve.

[0049] The protective cover can prevent scalding accidents caused by manual maintenance.

[0050] The steam pipe is any one of a spiral pipe and a serpentine pipe, or is a plurality of annular pipes connected in series and sleeved on the conveying channel b1.

[0051] The heating temperature is 165-175°C, and the rotation speed of the feeding screw b2 is 150 rpm.

[0052] There are 11 heating zones connected in sequence in the conveying channel b1, and the heating mechanisms are synchronously designed for the 11 heating zones.

[0053] like Figure 2 As shown,

[0054] An extrusion die c is connected to the discharge end of the conveying channel b1, and the extrusion die c includes a die body c1 with a material cavity, a feed port connected to the conveying channel b1 is provided on one side of the die body c1, and a plurality of horizontal extrusion holes c10 are provided on the other side of the die body c1 opposite to the side with the feed port.

[0055] The product coming out of the horizontal extrusion hole c10 is a continuous strip material with residual temperature, and then the continuous strip material needs to be cooled.

[0056] like Figure 3 As shown, and a pelletizing device d located behind the extrusion die c, the pelletizing device includes a receiving channel d1 for receiving the cooled continuous strip material, an inner cone d2 is provided inside the discharge end of the receiving channel, the large inner diameter end of the inner cone is the feed end, the small inner diameter end is the discharge end, a pelletizing cutter d3 is connected to the small inner diameter end of the inner cone, and the pelletizing cutter is connected to the pelletizing motor d4 through a belt transmission structure. The belt transmission structure is installed in the protective shell to prevent the pelletizer from getting stuck in the belt transmission structure and affecting the normal operation of the pelletizing device.

[0057] The belt transmission structure includes two pulleys and a belt looped around the pulleys.

[0058] The granulating cutter d3 is in a straight line or X shape and is fixed at the center of the inner cone d2 by an internal U-shaped frame.

[0059] A material guiding track arranged obliquely downward is connected to the small inner diameter end of the inner cone cylinder.

[0060] The granules formed by the granulation cutter d3 are discharged into the collecting box through the material guide track.

[0061] like Figure 4-5 As shown, a main feeding device b is connected to the feed end of the conveying channel b1, and the main feeding device b includes a feed hopper b11 which is arranged on the upper side of the feed end of the conveying channel b1 and connected through a plurality of columns b10. A feed hopper b11 is connected to the upper side of the feed end of the conveying channel b1 through a plurality of columns b10. In this embodiment, there are four columns b10 and they are distributed in an array. The feed hopper b11 is fixed on a feed bottom plate b16, and the feed bottom plate b16 is fixed to the upper ends of the four columns b10.

[0062] The second feed hopper b11 is suspended to prevent the heat of the conveying channel b1 from being transferred to the second feed hopper b11 and affecting the feeding of the second feed hopper b11.

[0063] The lower end of the second feed hopper b11 is closed, and the upper end of the second feed hopper b11 is open. A feed funnel b18 is connected to the open end of the second feed hopper b11, and an observation glass b19 is connected to the feed funnel b18.

[0064] The feeding funnel b18 can expand the feeding capacity, and the designed observation glass b19 can facilitate the observation of the internal materials.

[0065] A discharge pipe b12 is connected to one side of the lower end of the feed hopper b11, and a vertical hopper b13 is connected to the discharge end of the discharge pipe b12. The lower end of the vertical hopper b13 is connected to the conveying channel b1. A screw b14 is passed through the feed hopper b11 and extends into the discharge pipe b12. The screw b14 is connected to a feeding motor b15.

[0066] When the feeding motor b15 is started, the screw b14 is driven to rotate. At this time, the material in the feeding hopper b18 is taken away by the screw b14 and enters the discharge pipe b12, and finally enters the feeding end of the conveying channel b1 from the vertical hopper b13.

[0067] Secondly, an observation glass b17 is connected to one side of the feed hopper b11 connected to the discharge pipe b12. The observation glass b17 can be used to observe the amount of internal materials.

[0068] A bamboo fiber feeding device a is connected to the side between the middle of the conveying channel b1 and the discharge end. Figure 5-8As shown, the bamboo fiber feeding device a includes a support frame a1. Specifically, the support frame a1 of this embodiment includes a base a10, a horizontal plate a11 connected to the top of the base a10, a horizontal plate a2 a13 connected to the horizontal plate a11 through four connecting columns a12, and a horizontal plate a3 a15 connected to the horizontal plate a13 through four connecting columns a14.

[0069] Secondly, horizontal plate one a11, horizontal plate two a13 and horizontal plate three a15 are all rectangular plates, one end of horizontal plate one a11 is fixed on the top of base a10, the other end of horizontal plate one a11 is suspended, the periphery of horizontal plate two a13 is flush with the periphery of horizontal plate one a11, one end of horizontal plate three a15 is located above the middle part of horizontal plate two a13, and the other end of horizontal plate three a15 is extended to the outside of the end of horizontal plate two a13 away from the suspended end of horizontal plate one a11.

[0070] The interval distribution can effectively reduce the weight of the whole machine. At the same time, the alignment and suspended structure can effectively help the stability of the structure. Because only when the support frame structure is stable can the working efficiency of the whole feeding device be ensured.

[0071] At the same time, the suspended design can make effective use of the existing space.

[0072] The lower end of the connecting column a12 is locked on the horizontal plate a11 through two nuts, and at the same time, the horizontal plate a13 can also be fixed by two nuts. This structure can facilitate the installation and disassembly of the entire structure.

[0073] Similarly, the connecting column 2 a14 can also use the above-mentioned method to realize the connection between the horizontal plate 2 and the horizontal plate 3, as well as the subsequent disassembly.

[0074] A horizontally arranged discharge trough a2 is provided on the support frame a1, and the discharge end of the discharge trough a2 is connected to the side between the middle part and the discharge end and is communicated with the conveying channel b1. A spiral discharge mechanism a3 is provided in the discharge trough a2, and the discharge trough a2 and the spiral discharge mechanism a3 are fixed on the upper surface of the horizontal plate a2 a13, and the guide cylinder a4 and the power drive mechanism a9 are fixed on the upper surface of the horizontal plate a3 a15.

[0075] Furthermore, the spiral discharging mechanism a3 includes a spiral discharging rod a30 inserted into the discharging trough a2, a fixed box a31 fixed on the horizontal plate a13, and a screw protection tube a32 connected between the fixed box a31 and the discharging trough a2. A servo motor a33 and a reducer a34 connected to the output shaft of the servo motor a33 are connected to the base a10. The reducer a34 is fixed on the side of the fixed box a31 away from the screw protection tube a32. A transmission shaft a35 is connected to the end of the spiral discharging rod a30 close to the screw protection tube a32, and the transmission shaft a35 is connected to the reducer a34.

[0076] The fixed box a31 is directly fixed on the horizontal plate 2 and can be fixed by welding or bolts.

[0077] And a material guide cylinder a4 is located above the discharge trough a2, the upper end of the material guide cylinder a4 is open and a feed hopper a5 is connected to the open end of the material guide cylinder a4, a lower flange a40 is provided at the open end of the material guide cylinder a4, an upper flange a50 is connected to the lower end of the feed hopper a5, the upper flange a50 is placed on the lower flange a40 and the upper flange a50 and the lower flange a40 are fixed together by a plurality of bolts.

[0078] A horizontally arranged discharge barrel a6 and two extrusion screws a7 inserted in the discharge barrel a6 are connected to one side of the guide barrel a4, and one end of the extrusion screw a7 extends into the guide barrel a4 and is rotatably connected to the guide barrel a4. In this embodiment, there are two extrusion screws a7 and they are in the same horizontal plane, and the two extrusion screws a7 rotate simultaneously.

[0079] A feeding hopper a8 is connected to the discharge end of the discharge cylinder a6, and the lower end of the feeding hopper a8 is communicated with the upper side of the feed end of the discharge trough a2; a material-pickup shaft a41 located above the extrusion screw a7 is connected to the guide cylinder a4, and one end of the material-pickup shaft a41 is extended to the bottom of the feed hopper a5; the material-pickup shaft a41 and the extrusion screw a7 are connected to the same power drive mechanism a9; a material-pickup piece a42 is connected to the end of the material-pickup shaft a41 extended to the bottom of the feed hopper a5.

[0080] The rotation of the material-shifting piece a42 can prevent the interruption of the supply of the bamboo fiber material, and the extrusion screw a7 can force the bamboo fiber material not to be squeezed and damaged, and can form a one-time mixing of the bamboo fiber material. At the same time, the height difference is used to make the bamboo fiber material enter the discharge trough a2, which can form a broken up bamboo fiber material, and finally form a quantitative feeding through the spiral discharge mechanism a3. The whole structure can improve the feeding efficiency and feeding quality of the bamboo fiber material.

[0081] The power drive mechanism a9 includes a box body a91 fixed on the top of the support frame a1, one end of the extrusion screw a7 extends into the box body a91 and the extrusion screw a7 and the box body a91 are rotatably connected, the other end of the material shifting shaft a41 extends into the box body a91 and the material shifting shaft a41 and the box body a91 are rotatably connected, one end of the extrusion screw a7 extending into the box body a91 and the other end of the material shifting shaft a41 are connected through a linkage structure, and any one of the extrusion screws a7 is connected to the power drive motor a92.

[0082] The material-shifting piece a42 of the present embodiment is Z-shaped, and the rotation of the material-shifting shaft a41 drives the material-shifting piece a42 to rotate synchronously, and any end of the material-shifting piece a42 intermittently extends into the lower end of the feed hopper a5.

[0083] Secondly, the material-moving shaft a41 is located above the center between the two extrusion screws a7.

[0084] The production line also includes a cooling device e located between the extrusion die c and the pelletizing device d, and the cooling device e is used to cool the continuous strip material extruded by the extrusion die c and send the continuous strip material to the pelletizing device d for pelletizing.

[0085] Furthermore, if Figure 9-11 As shown, the cooling device e includes a cooling water trough e1 for receiving the continuous strip material extruded by the extrusion die c, a plurality of guide rollers e2 are provided on the cooling water trough e1, and a plurality of annular guide grooves e20 are provided on each guide roller e2 at intervals, at least one guide roller e2 among the plurality of guide rollers e2 is immersed in the cooling water of the cooling water trough e1, and the remaining guide rollers e2 are located above the normal cooling water level of the cooling water trough e1.

[0086] A guide roller e2 located above the normal cooling water level is respectively provided at both ends of the cooling water tank e1, and a guide roller e2 located in the middle of the cooling water tank e1 and also located above the normal cooling water level.

[0087] The cooling water tank e1 is connected with two guide rollers e2 located in the cooling water of the cooling water tank e1. The two guide rollers e2 are spaced apart and distributed on both sides of the guide roller one located in the middle of the cooling water tank e1.

[0088] The cooling device e also includes an air cooling groove e3 located at one end of the cooling water groove e1 away from the extrusion die c, and the air cooling groove e3 is connected to two guide rollers e4 located in the same horizontal plane, and each guide roller e4 is respectively provided with a plurality of annular guide grooves e40 distributed at intervals, and the air cooling groove e3 is also connected to a cooling air hood e5 located on the upper side between the two guide rollers e4, and the air outlet of the cooling air hood e5 faces the guide roller e4 and blows air downward.

[0089] The cooling air hood e5 is connected to the upper end of the vertically arranged air inlet pipe e6, the air cooling groove e3 is installed at the upper end of the air inlet pipe e6 and is located below the cooling air hood e5, and the lower end of the air inlet pipe e6 is connected to a blower e7, and the blower e7 is fixed on a fixed bracket e8.

[0090] The bottom of the fixed bracket e8 is connected to four universal wheels with brakes for easy movement.

[0091] like Figure 12-13 As shown,

[0092] An annular groove b31 is provided on the inner wall of one end of the conveying channel b1 close to the discharge trough a2. The annular groove b31 is located behind the discharge port of the discharge groove a2, and a rotating ring b3 is installed in the annular groove b31. The end faces of the rotating ring b3 are rotatably sealed with the groove walls on both sides of the annular groove b31. An annular sealing ring b32 is respectively provided on the groove walls on both sides of the annular groove b31, and a sealing annular groove b34 is arranged on the end face of the annular sealing ring b32 away from the bottom of the annular groove b31. External convex rings b33 are respectively provided on the two end faces of the rotating ring b3. The external convex ring b33 is stuck in the sealing annular groove b34, and the groove width of the sealing annular groove b34 is smaller than the thickness of the external convex ring b33. This structure can form a seal. At the same time, after the external convex ring b33 is stuck in the sealing annular groove b34, two independent annular sealing spaces b37 are formed between the sealing annular groove b34 and the external convex ring b33. Grease is added in the annular sealing space, which can be used for self-lubrication and reduce friction.

[0093] That is, the outer end surface of the outer convex ring b33 matches the bottom of the sealing annular groove b34 to form a seal, and at the same time, it can also prevent the displacement of the rotating ring b3.

[0094] A connecting hole b35 connected to the annular groove b31 and a driving gear b36 partially accommodated in the connecting hole are also provided on the conveying channel b1. A plurality of external teeth evenly distributed circumferentially are provided on the outer wall of the rotating ring b3. The driving gear b36 meshes with the external teeth. The driving gear b36 is fixed to the conveying channel b1 through a U-shaped frame. At the same time, the driving gear b36 is connected to the servo motor.

[0095] A plurality of spiral blades b38 are provided on the inner wall of the rotating ring b3, and the rotation direction of the spiral blades b38 is opposite to that of the spiral blades 2 of the feeding screw b2.

[0096] The above-designed structure can force the material entering the conveying channel b1 from the discharge chute a2 to be mixed with the material in the conveying channel b1.

[0097] The granulation process is as follows:

[0098] S1. Prepare materials, including polylactic acid (PLA), bamboo fiber, talcum powder and additives, and weigh them according to the set amount for use;

[0099] S2, adding, polylactic acid (PLA), talcum powder and additives are added into the main feeding device b, and bamboo fiber is added into the bamboo fiber feeding device a, the main feeding device b is arranged at the feeding end of the conveying channel b1, and the bamboo fiber feeding device a is arranged at the side between the middle part and the discharging end of the conveying channel b1;

[0100] The composition is made of 80-90% polylactic acid (PLA), 5-12% talc, 1-15% bamboo fiber, and 20% additives, including nucleating agents, antioxidants, hydrolyzing agents, fiber floating agents, antibacterial agents, and the like.

[0101] S3, heating, the feeding screw b2 passing through the conveying channel b1 is turned on, and the polylactic acid (PLA), talcum powder and additives are mixed through the feeding screw b2, and the bamboo fiber is mixed with the mixed polylactic acid (PLA), talcum powder and additives through the feeding screw b2. During the mixing process of the raw materials, the heating mechanism heats the conveying channel b1 and heats the raw materials simultaneously;

[0102] S4, extrusion, the heated mixed raw material enters the extrusion die c, and the extrusion die c extrude a plurality of continuous strips of material;

[0103] S5, cooling, the continuous strip materials enter the cooling device e for cooling, the cooling includes water cooling and air cooling;

[0104] S6, granulation: the cooled continuous strip material enters the pelletizing device d for granulation, that is, composite material particles are finally obtained.

[0105] The specific mixing process is as follows:

[0106] Put polylactic acid and other mixing aids into the feed hopper b11, mix the above materials through the screw b14, and force the mixed materials into the conveying channel b1. The conveying channel b1 is heated to force the above mixed materials to heat up. At this time, put the bamboo fiber material into the bamboo fiber feeding device a, that is, put the bamboo fiber material (powder) into the feed hopper a5;

[0107] Turn on the power drive mechanism a9, and the bamboo fiber material enters the material guide cylinder a4;

[0108] As the extrusion screw a7 rotates, the bamboo fiber material is forced from the discharge barrel a6 into the hopper a8, and finally the bamboo fiber material is forced into the final conveying channel b1 through the spiral discharge mechanism a3 arranged in the discharge trough a2, and is mixed with the above-mentioned mixed material, and finally the mixed material enters the next process.

[0109] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A polylactic acid bamboo fiber composite material granulation production line, comprising a conveying channel (b1), a feeding screw (b2) passing through the conveying channel (b1), and a heating mechanism for heating the conveying channel (b1), an extrusion die (c) connected to the discharge end of the conveying channel (b1), and a granulation device (d) located behind the extrusion die (c), characterized in that: A main feeding device (b) is connected to the feeding end of the conveying channel (b1), and a bamboo fiber feeding device (a) is connected to the side between the middle and the discharging end of the conveying channel (b1). The production line also includes a cooling device (e) located between the extrusion die (c) and the pelletizing device (d), and the cooling device (e) is used to cool the continuous strip material extruded by the extrusion die (c) and feed the continuous strip material into the pelletizing device (d) for pelletizing; The bamboo fiber feeding device (a) comprises a support frame (a1), a horizontally arranged discharge trough (a2) is provided on the support frame (a1), the discharge end of the discharge trough (a2) is connected to the side between the middle part and the discharge end of the conveying channel (b1) and is communicated with the conveying channel (b1), a spiral discharge mechanism (a3) ​​is provided in the discharge trough (a2), and a guide cylinder (a4) is located above the side of the discharge trough (a2), the upper end of the guide cylinder (a4) is open and a feed hopper (a5) is connected to the open end of the guide cylinder (a4), a horizontally arranged discharge cylinder (a6) is connected to one side of the guide cylinder (a4), and two extrusion screws (a7) are inserted into the discharge cylinder (a6), and the extrusion screws (a7) are connected to the discharge cylinder (a6). 7) extends into the guide barrel (a4) and is rotatably connected to the guide barrel (a4), the two extrusion screws (a7) are in the same horizontal plane and rotate in the same direction, a drop hopper (a8) is connected to the discharge end of the discharge barrel (a6), and the lower end of the drop hopper (a8) is connected to the upper side of the feed end of the discharge trough (a2), a material-discharging shaft (a41) located above the extrusion screw (a7) is connected to the guide barrel (a4), one end of the material-discharging shaft (a41) is extended to the bottom of the feed hopper (a5), the material-discharging shaft (a41) and the extrusion screw (a7) are connected to the same power drive mechanism (a9), and a material-discharging piece (a42) is connected to the end of the material-discharging shaft (a41) extending to the bottom of the feed hopper (a5); An annular groove (b31) is provided on the inner wall of one end of the conveying channel (b1) close to the discharge trough (a2). An annular groove (b31) is located behind the discharge port of the discharge groove (a2), and a rotating ring (b3) is installed in the annular groove (b31). The end faces of the rotating ring (b3) and the groove walls on both sides of the annular groove (b31) are rotatably sealed. An annular sealing ring (b32) is provided on the groove walls on both sides of the annular groove (b31), and a sealing annular groove (b34) is provided on the end face of the annular sealing ring (b32) away from the groove bottom of the annular groove (b31). External convex rings (b33) are provided on the two end faces of the rotating ring (b3). The external convex ring (b33) is clamped in the sealing annular groove (b34), and the groove width of the sealing annular groove (b34) is smaller than the thickness of the external convex ring (b33). The external convex ring (b33) is clamped in the sealing annular groove (b34), and two independent annular sealing spaces (b37) are formed between the sealing annular groove (b34) and the external convex ring (b33), and butter is added in the annular sealing space. The conveying channel (b1) is also provided with a connecting hole (b35) connected to the annular groove (b31), and a driving gear (b36) partially accommodated in the connecting hole. The outer wall of the rotating ring (b3) is provided with a plurality of external teeth evenly distributed in a circumference. The driving gear (b36) is meshed with the external teeth. The driving gear (b36) is fixed to the conveying channel (b1) through a U-shaped frame. The driving gear (b36) is connected to the servo motor. A plurality of spiral blades 1 (b38) are provided on the inner wall of the rotating ring (b3), and the rotation direction of the spiral blade 1 (b38) is opposite to the rotation direction of the spiral blade 2 of the feeding screw (b2); The material shifting piece (a42) is Z-shaped, and the rotation of the material shifting shaft (a41) drives the material shifting piece (a42) to rotate synchronously, and any end of the material shifting piece (a42) intermittently extends into the lower end of the feed hopper (a5).

2. The polylactic acid bamboo fiber composite material granulation production line according to claim 1, characterized in that: The cooling device (e) comprises a cooling water trough (e1) for receiving the continuous strip material extruded by the extrusion die (c), a plurality of guide rollers (e2) are provided on the cooling water trough (e1), and a plurality of annular guide grooves (e20) are provided on each guide roller (e2) at intervals, at least one guide roller (e2) among the plurality of guide rollers (e2) is immersed in the cooling water of the cooling water trough (e1), and the remaining guide rollers (e2) are located above the normal cooling water level of the cooling water trough (e1).

3. The granulation production line of polylactic acid bamboo fiber composite material according to claim 2, characterized in that: The cooling device (e) further comprises an air cooling groove (e3) located at one end of the cooling water groove (e1) away from the extrusion die (c); the air cooling groove (e3) is connected to two guide rollers (e4) located in the same horizontal plane; each guide roller (e4) is provided with a plurality of annular guide grooves (e40) distributed at intervals; the air cooling groove (e3) is further connected to a cooling air hood (e5) located on the upper side between the two guide rollers (e4); the air outlet of the cooling air hood (e5) faces the guide roller (e4) and blows air downward.

4. The granulation production line of polylactic acid bamboo fiber composite material according to claim 3, characterized in that: The cooling air hood (e5) is connected to the upper end of a vertically arranged air inlet pipe (e6), the air cooling groove (e3) is installed at the upper end of the air inlet pipe (e6) and is located below the cooling air hood (e5), and the lower end of the air inlet pipe (e6) is connected to a blower (e7), and the blower (e7) is fixed on a fixed bracket (e8).

5. The granulation production line of polylactic acid bamboo fiber composite material according to claim 1, characterized in that: The heating mechanism comprises a steam pipe surrounding the outer wall of the conveying channel (b1) and a protective sleeve sleeved on the outside of the conveying channel (b1), wherein the steam pipe is connected to a steam source and is located between the conveying channel (b1) and the protective sleeve.

6. The granulation production line of polylactic acid bamboo fiber composite material according to claim 1, characterized in that: The main feeding device (b) includes a feed hopper 2 (b11) which is arranged on the upper side of the feed end of the conveying channel (b1) and connected by a plurality of columns (b10), the lower end of the feed hopper 2 (b11) is closed, and the upper end of the feed hopper 2 (b11) is open, a discharge pipe (b12) is connected to one side of the lower end of the feed hopper 2 (b11), and a vertical hopper (b13) is connected to the discharge end of the discharge pipe (b12), the lower end of the vertical hopper (b13) is connected to the conveying channel (b1), a screw 1 (b14) is passed through the feed hopper 2 (b11) and the screw 1 (b14) extends into the discharge pipe (b12), and the screw 1 (b14) is connected to a feeding motor 1 (b15).

7. The granulation production line of polylactic acid bamboo fiber composite material according to claim 1, characterized in that: The support frame (a1) includes a base (a10), a horizontal plate one (a11) connected to the top of the base (a10), a horizontal plate two (a13) connected to the horizontal plate one (a11) via four connecting columns one (a12), a horizontal plate three (a15) connected to the horizontal plate two (a13) via four connecting columns two (a14), the discharge chute (a2) and the spiral discharge mechanism (a3) ​​are fixed on the upper surface of the horizontal plate two (a13), and the guide cylinder (a4) and the power drive mechanism (a9) are fixed on the upper surface of the horizontal plate three (a15).

8. The polylactic acid bamboo fiber composite material granulation production line according to claim 1, characterized in that: The extrusion die (c) comprises a die body (c1) having a material cavity, a feed port connected to a conveying channel (b1) is provided on one side of the die body (c1), and a plurality of horizontal extrusion holes (c10) are provided on the other side of the die body (c1) opposite to the side having the feed port.

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