CN111633861A - Polylactic acid bamboo fiber composite's granulation production line - Google Patents

Abstract

The invention relates to a granulation production line of a polylactic acid bamboo fiber composite material. The technical problems that the design is unreasonable and the like in the prior art are solved. This polylactic acid bamboo fiber composite's granulation production line includes transfer passage, and wear to establish the feed screw in transfer passage, and the heating mechanism to transfer passage heating, discharge end at transfer passage is connected with extrusion die, and be located the eager grain device at extrusion die rear, feed end at transfer passage is connected with main feeding device, lateral part between transfer passage middle part and discharge end is connected with bamboo fiber feeding device, this production line still includes the cooling device who is located extrusion die and cuts grain device between, cooling device is used for cooling off the continuous strip material that extrusion die extruded and sends into continuous strip material to cutting grain device in and carry out the granulation. The invention has the advantages that: can prevent the carbonization of the bamboo fiber material caused by long-time high-temperature heating in the conveying channel and improve the product quality.

Description

Polylactic acid bamboo fiber composite's granulation production line

Technical Field

The invention belongs to the technical field of composite material processing, and particularly relates to a granulation production line of a polylactic acid bamboo fiber composite material.

Background

The polylactic acid, the bamboo fiber and the auxiliary materials can be mixed to prepare the environment-friendly material, and the material is applied to the food fields of various tableware and the like.

When mixing various materials, the current materials are mixed together in a concentrated manner and then heated to produce the final composite material.

The heating is carried out in the transmission channel, and the mixing can cause the carbonization of the bamboo fiber material in the transmission spiral channel due to the high-temperature heating, thereby destroying the original performance of the bamboo fiber.

Secondly, the cooling efficiency is yet to be further improved for the cooling of the continuous extrudate.

Disclosure of Invention

The invention aims to solve the problems and provides a granulation production line of the polylactic acid bamboo fiber composite material, which can solve the technical problems.

In order to achieve the purpose, the invention adopts the following technical scheme: this polylactic acid bamboo fiber composite's granulation production line includes transfer passage, and wear to establish the feed screw in transfer passage, and the heating mechanism to transfer passage heating, discharge end at transfer passage is connected with extrusion die, and be located the eager grain device at extrusion die rear, feed end at transfer passage is connected with main feeding device, lateral part between transfer passage middle part and discharge end is connected with bamboo fiber feeding device, this production line still includes the cooling device who is located extrusion die and cuts grain device between, cooling device is used for cooling off the continuous strip material that extrusion die extruded and sends into continuous strip material to cutting grain device in and carry out the granulation.

In the above-mentioned polylactic acid bamboo fiber composite's granulation production line, cooling device include the cooling trough that is used for accepting the continuous strip material that extrusion die extrudes, be equipped with a plurality of guide rolls one on the cooling trough to and set up a plurality of annular guide ways one that interval distribution on every guide roll one, at least one guide roll one in a plurality of guide rolls one immerses in the cooling water of cooling trough, remaining guide roll one is located above the normal cooling water liquid level of cooling trough.

In foretell polylactic acid bamboo fiber composite's granulation production line, cooling device still including being located the cooling trough and keeping away from the air-cooled groove of extrusion die one end, be connected with two guide rolls II that are located same horizontal plane on the air-cooled groove, be equipped with a plurality of interval distribution's annular guide groove II on every guide roll II respectively, still be connected with the cooling fan housing that is located the side top between two guide rolls II on the air-cooled groove, the air outlet of cooling fan housing is towards guide roll II and is bloied downwards.

In the above-mentioned polylactic acid bamboo fiber composite's granulation production line, the cooling fan housing connect and be the air-supply line upper end of vertical setting, air-cooled groove is installed in the air-supply line upper end and is located the cooling fan housing below, the lower extreme of air-supply line is connected with the air-blower, and the air-blower is fixed on the fixed bolster.

In the above-mentioned polylactic acid bamboo fiber composite's granulation production line, heating mechanism includes the steam conduit who encircles at the transfer passage outer wall, steam conduit and steam source connect to and the cover is established at the lag of transfer passage outside, steam conduit is located between transfer passage and the lag.

In foretell polylactic acid bamboo fiber composite's granulation production line, cut grain device including be used for carrying on the continuous strip material after the cooling and accept the material passageway, connect the discharge end inside of material passageway and be equipped with interior awl section of thick bamboo, the big internal diameter end of interior awl section of thick bamboo is the feed end, and little internal diameter end is the discharge end, is connected with the granulation cutter including the little internal diameter end of awl section of thick bamboo, and the granulation cutter passes through the belt drive structure and is connected with the granulation motor.

In foretell polylactic acid bamboo fibre combined material's granulation production line, main feeding device is including setting up the feeder hopper that just connects through a plurality of stands at transfer passage's feed end upside, the lower extreme of feeder hopper is sealed, the upper end of feeder hopper is uncovered, be connected with the discharging pipe in lower extreme one side of feeder hopper, and connect the vertical hopper at the discharging pipe discharge end, the lower extreme and the transfer passage intercommunication of vertical hopper, wear to be equipped with screw rod one and screw rod one in the feeder hopper and stretch into to the discharging pipe, this screw rod one is connected with feed motor one.

In the production line for granulating the polylactic acid bamboo fiber composite material, the bamboo fiber feeding device comprises a support frame, a discharge chute which is horizontally arranged is arranged on the support frame, the discharge end of the discharge chute is connected with the lateral part between the middle part and the discharge end and is communicated with a conveying channel, a spiral discharging mechanism is arranged in the discharge chute, a guide cylinder which is positioned above the side of the discharge chute, the upper end of the guide cylinder is open, the opening of the guide cylinder is connected with a feed hopper, one side of the guide cylinder is connected with the horizontally arranged discharge cylinder, two extruding screw rods which are inserted into the discharge cylinder are connected with the guide cylinder in a way that one end of each extruding screw rod extends into the guide cylinder and is rotationally connected with the guide cylinder, the two extruding screw rods are positioned in the same horizontal plane and have the same rotating direction, the discharge end of the discharge cylinder is connected with a blanking hopper, the lower end of the blanking hopper is communicated with the upper side of the feed end of the discharge chute, one end of the material stirring shaft is extended to the lower part of the feed hopper, the material stirring shaft and the material extruding screw rod are connected with the same power driving mechanism, and the material stirring sheet is connected to one end of the material stirring shaft, which is extended to the lower part of the feed hopper.

In the production line for granulating the polylactic acid bamboo fiber composite material, the material pushing shaft is positioned above the center between the two extruding screws.

In foretell polylactic acid bamboo fiber composite's granulation production line, power drive mechanism including fixing the box at the carriage top, the one end of crowded material screw rod stretches into in the box and crowded material screw rod and box rotate to be connected, the other end of dialling the material axle stretches into in the box and dial material axle and box rotate to be connected, crowded material screw rod stretches into one end in the box and dials the other end of material axle and passes through linkage structure and connect, arbitrary crowded material screw rod is connected with power drive motor.

The linkage structure comprises a first gear arranged at one end of each extrusion screw rod extending into the box body, the two first gears are meshed, and a second gear meshed with any one first gear is arranged at the other end of the material stirring shaft.

In the production line for granulating the polylactic acid bamboo fiber composite material, the stirring sheet is Z-shaped, the stirring shaft rotates to drive the stirring sheet to synchronously rotate, and any one end of the stirring sheet intermittently extends into the lower end of the feeding hopper.

In the production line for granulating the polylactic acid bamboo fiber composite material, the material pushing shaft is positioned above the center between the two extruding screws.

In the above-mentioned polylactic acid bamboo fiber composite's granulation production line, the support frame include the base, connect the horizontal plate one at the base top, be connected with horizontal plate two through four connecting columns on horizontal plate one, be connected with horizontal plate three through four connecting columns two on horizontal plate two, blown down tank and spiral discharge mechanism fix on horizontal plate two upper surfaces, guide cylinder and power drive mechanism fix on horizontal plate three upper surfaces.

In foretell polylactic acid bamboo fiber composite's granulation production line, spiral discharge mechanism including wear to establish the spiral discharge bar in the blown down tank to and fix the fixed case on horizontal plate two, and connect the screw rod protecting tube between fixed case and blown down tank, be connected with servo motor on the base, and connect the reduction gear at servo motor output shaft, the reduction gear is fixed in the one side that the screw rod protecting tube was kept away from to the fixed case, the one end that the spiral discharge bar is close to the screw rod protecting tube is connected with the transmission shaft, and transmission shaft and retarder connection.

In the production line for granulating the polylactic acid bamboo fiber composite material, the open end of the guide cylinder is provided with the lower flange, the lower end of the feed hopper is connected with the upper flange, the upper flange is placed on the lower flange, and the upper flange and the lower flange are fixed together through a plurality of bolts.

In foretell polylactic acid bamboo fiber composite's granulation production line, horizontal plate one, horizontal plate two and horizontal plate three be the rectangular plate, the one end of horizontal plate one is fixed at the base top, the other end of horizontal plate one is unsettled state, the periphery of horizontal plate two and the periphery of horizontal plate one flush, the one end of horizontal plate three is located the middle part top of horizontal plate two, the other end of horizontal plate three extends to the one end outside of horizontal plate two that keeps away from horizontal plate one free end.

In the granulation production line of the polylactic acid bamboo fiber composite material, four upright posts are distributed in an array, the feed hopper is fixed on the feeding bottom plate, and the feeding bottom plate is fixed at the upper ends of the four upright posts.

In the production line for granulating the polylactic acid bamboo fiber composite material, one side of the feed hopper, which is connected with the discharge pipe, is connected with a first observation glass.

In the granulating production line of the polylactic acid bamboo fiber composite material, the opening of the feed hopper is connected with the feed hopper.

In the production line for granulating the polylactic acid bamboo fiber composite material, a second observation glass is connected to the feeding hopper.

In the above-mentioned polylactic acid bamboo fiber composite's granulation production line, extrusion die including the mould body that has the material chamber, be equipped with the feed inlet with transfer passage intercommunication in one side of mould body, be equipped with a plurality of level at mould body and the opposite side of being equipped with feed inlet one side and extrude the hole.

Compared with the prior art, the granulation production line of the polylactic acid bamboo fiber composite material has the advantages that:

the main raw materials are fed through the feed hopper, and the discharge of the bamboo fiber feeding device is arranged on the side part of the bamboo fiber feeding device, so that the mixing purpose can be achieved, meanwhile, the carbonization of the bamboo fiber material caused by long-time high-temperature heating in a conveying channel can be prevented, and the product quality is improved; meanwhile, the path passing through the conveying channel is shortened, so that the addition amount of the bamboo fiber can be increased, and the cost of producing the main material is reduced.

By adopting the cooling device, the rapid cooling can be realized, the cooling is thorough, the cooling efficiency and the granulating quality are improved invisibly, and the phenomena of large burrs and the like in the granulating process caused by the fact that the cooling is not in place are avoided.

Dial the rotatory disconnected confession that can prevent bamboo fiber material of tablet, and its shearing force of the crowded material screw rod of setting is little, can prevent that bamboo fiber material from not being extruded and leading to the impaired decomposition of bamboo fiber material, and can form once mixing to bamboo fiber material, and simultaneously, utilize the difference in height to get into bamboo fiber material to the blown down tank in, can form the breaking up to bamboo fiber material, and form quantitative feed through spiral discharge mechanism at last, overall structure can improve the feed efficiency of bamboo fiber material, and the feed quality.

Drawings

Fig. 1 is a simple schematic diagram of a granulation production line of the polylactic acid bamboo fiber composite material provided by the invention.

FIG. 2 is a schematic view of an extrusion die structure provided by the present invention.

Fig. 3 is a schematic structural view of a dicing apparatus provided in the present invention.

FIG. 4 is a schematic structural view of a main feeding device provided by the present invention.

FIG. 5 is a schematic view of another perspective structure of the main feeding device provided by the present invention.

FIG. 6 is a schematic structural view of a bamboo fiber feeding device provided by the present invention.

Fig. 7 is a schematic view showing a part of the structure of the guide cylinder according to the present invention.

FIG. 8 is a schematic view of the feeding state of the granulating production line of the polylactic acid bamboo fiber composite material provided by the invention.

Fig. 9 is a schematic view of a cooling water tank according to the present invention.

Fig. 10 is a schematic view of the structure of the air cooling tank provided by the present invention.

Fig. 11 is a schematic view of a transverse cross-sectional structure of a cooling fan cover according to the present invention.

Fig. 12 is a schematic view of a partial structure of a rotating ring provided by the present invention.

Fig. 13 is an enlarged schematic view of the structure at B in fig. 12 according to the present invention.

In the figure, a bamboo fiber feeding device a, a supporting frame a1, a base a10, a first horizontal plate a11, a first connecting upright post a12, a second horizontal plate a13, a second connecting upright post a14, a third horizontal plate a15, a discharge chute a2, a spiral discharge mechanism a3, a spiral discharge rod a30, a fixed box a31, a screw protection pipe a32, a servo motor a33, a speed reducer a34, a transmission shaft a35, a guide cylinder a4, a lower flange a40, a stirring shaft a41, a stirring sheet a41, a feed hopper a41, an upper flange a41, a discharge cylinder a41, an extrusion screw a41, a blanking hopper a41, a power driving mechanism a41, a box a41, a power driving motor a41, a conveying channel b 41, an upright post b 41, a feed hopper b 41, a discharge pipe b 41, a vertical hopper b 41, a screw b 41, a feeding motor b 41, a feeding bottom plate b, a glass extrusion screw observation hole b, a41, a observation die 41 c, a glass extrusion die 41, a and a, The material receiving channel d1, the inner cone cylinder d2, the granulating cutter d3, the granulating motor d4, the cooling device e, the cooling water tank e1, the first guide roller e2, the first annular guide groove e20, the air cooling groove e3, the second guide roller e4, the second annular guide groove e40, the cooling fan cover e5, the air inlet pipe e6, the blower e7 and the fixed support e 8.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the polylactic acid bamboo fiber composite material granulation production line comprises a conveying channel b1 and a feeding screw b2 penetrating through the conveying channel b1, wherein the feeding screw b2 is connected with a feeding main motor, of course, in order to improve the rotation stability of the feeding screw b2, a gear box is connected to an output shaft of the feeding main motor, the feeding screw b2 is connected with the gear box, and a heating mechanism for heating the conveying channel b1 comprises a steam pipeline surrounding the outer wall of the conveying channel b1, the steam pipeline is connected with a steam source, and a protective sleeve sleeved outside the conveying channel b1, and the steam pipeline is positioned between the conveying channel b1 and the protective sleeve.

The protection sleeve can prevent scalding accidents caused by manual maintenance.

The steam pipeline is any one of a spiral pipe and a coiled pipe, or a plurality of circular pipes which are connected in series and sleeved on the conveying channel b 1.

The heating temperature was 165 ℃ and 175 ℃ and the rotational speed of the feed screw b2 was 150 rpm.

The conveying channel b1 contains 11 heating zones connected in series, and the heating mechanism is synchronously designed with 11 heating zones.

As shown in figure 2 of the drawings, in which,

the discharge end of the conveying channel b1 is connected with an extrusion die c, the extrusion die c comprises a die body c1 with a material cavity, one side of the die body c1 is provided with a feed inlet communicated with the conveying channel b1, and the other side of the die body c1, which is opposite to the side provided with the feed inlet, is provided with a plurality of horizontal extrusion holes c 10.

The product from the horizontal extrusion hole c10 is a continuous strand with residual temperature, and then needs to be cooled.

As shown in figure 3 of the drawings,

and the granulating device d is positioned behind the extrusion die c, the granulating device comprises a material receiving channel d1 for receiving the cooled continuous strip-shaped material, an inner cone cylinder d2 is arranged inside the discharge end of the material receiving channel, the large inner diameter end of the inner cone cylinder is a feed end, the small inner diameter end of the inner cone cylinder is a discharge end, the small inner diameter end of the inner cone cylinder is connected with a granulating cutter d3, and the granulating cutter is connected with a granulating motor d4 through a belt transmission structure. The belt transmission structure is arranged in the protective shell, so that the influence on the normal operation of the granulating device caused by the fact that the granulating card is clamped into the belt transmission structure is avoided.

The belt drive structure includes two pulleys and a belt looped around the pulleys.

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

The small inner diameter end of the inner cone cylinder is connected with a material guide rail which is obliquely and downwards arranged.

The granules formed by the granulating cutter d3 are discharged into a collecting box through a material guide rail.

As shown in the figures 4-5 of the drawings,

the feeding end of the conveying channel b1 is connected with a main feeding device b, the main feeding device b comprises a feeding hopper b11 which is arranged on the upper side of the feeding end of the conveying channel b1 and connected through a plurality of upright posts b10, the upper side of the feeding end of the conveying channel b1 is connected with a feeding hopper b11 through a plurality of upright posts b10, the upright posts b10 of the embodiment are four and distributed in an array, the feeding hopper b11 is fixed on a feeding bottom plate b16, and the feeding bottom plate b16 is fixed at the upper ends of the four upright posts b 10.

The overhead feed hopper b11 prevents heat from the transfer channel b1 from transferring to feed hopper b11 and affecting the feed of feed hopper b 11.

The lower end of the feed hopper b11 is closed, the upper end of the feed hopper b11 is open, the open end of the feed hopper b11 is connected with a feed hopper b18, and the feed hopper b18 is connected with a second observation glass b 19.

The feed hopper b18 can expand the feed volume, while the designed sight glass di b19 can facilitate the observation of the internal material.

One side of the lower end of the feed hopper b11 is connected with a discharge pipe b12 and a vertical hopper b13 connected to the discharge end of a discharge pipe b12, the lower end of the vertical hopper b13 is communicated with a conveying channel b1, a screw rod b14 penetrates through the feed hopper b11, the screw rod b14 extends into a discharge pipe b12, and the screw rod b14 is connected with a feed motor b 15.

When the feeding motor b15 is started, the screw b14 is driven to rotate, and at the moment, the material in the feeding hopper b18 is taken away by the screw b14 and enters the discharging pipe b12, and finally enters the feeding end of the conveying channel b1 from the vertical hopper b 13.

Next, a first observation glass b17 is connected to the side of the feed hopper b11 to which the discharge pipe b12 is connected. Sight glass one b17 may facilitate the observation of the amount of internal material.

A bamboo fiber feeding device a is connected to a side portion between the middle portion and the discharge end of the transfer passage b1, as shown in fig. 5 to 8,

the bamboo fiber feeding device a comprises a supporting frame a1, specifically, the supporting frame a1 of the embodiment comprises a base a10, a first horizontal plate a11 connected to the top of the base a10, a second horizontal plate a13 connected to the first horizontal plate a11 through a first four connecting uprights a12, and a third horizontal plate a15 connected to the second horizontal plate a13 through a second four connecting uprights a 14.

Secondly, the first horizontal plate a11, the second horizontal plate a13 and the third horizontal plate a15 are all rectangular plates, one end of the first horizontal plate a11 is fixed at the top of the base a10, the other end of the first horizontal plate a11 is in a suspended state, the periphery of the second horizontal plate a13 is flush with the periphery of the first horizontal plate a11, one end of the third horizontal plate a15 is located above the middle of the second horizontal plate a13, and the other end of the third horizontal plate a15 is extended to the outer side of one end, away from the suspended end of the first horizontal plate a11, of the second horizontal plate a 13.

The interval distribution, it can effectively alleviate complete machine weight, simultaneously, adopts alignment and unsettled structure, and it can form effective help to the stability of structure, because, only support frame stable in structure has, just can ensure whole feeding device's work efficiency.

Meanwhile, the suspension design can effectively utilize the existing space.

The lower end of the first connecting upright a12 is locked on the first horizontal plate a11 through two nuts, and meanwhile, the two nuts can be used for fixing the second horizontal plate a 13. This structure can facilitate the mounting and dismounting of the whole structure.

Similarly, the second connecting pillar a14 can also be used to connect the second horizontal plate and the third horizontal plate, and then disassemble the second horizontal plate and the third horizontal plate.

The support frame a1 is provided with a discharge chute a2 which is horizontally arranged, the discharge end of the discharge chute a2 is connected to the side part between the middle part and the discharge end and is communicated with the conveying channel b1, the discharge chute a2 is internally provided with a spiral discharge mechanism a3, the discharge chute a2 and the spiral discharge mechanism a3 are fixed on the upper surface of the second horizontal plate a13, and the guide cylinder a4 and the power driving mechanism a9 are fixed on the upper surface of the third horizontal plate a 15.

Further, the spiral discharging mechanism a3 comprises a spiral discharging rod a30 penetrating the discharging groove a2, a fixing box a31 fixed on the second horizontal plate a13, and a screw protecting tube a32 connected between the fixing box a31 and the discharging groove a2, a servo motor a33 and a speed reducer a34 connected to the output shaft of the servo motor a33 are connected to the base a10, the speed reducer a34 is fixed on the side, away from the screw protecting tube a32, of the fixing box a31, a transmission shaft a35 is connected to one end, close to the screw protecting tube a32, of the spiral discharging rod a30, and the transmission shaft a35 is connected with a speed reducer a 34.

The fixed box a31 is directly fixed on the second horizontal plate and can be fixed by welding or bolts.

And a guide cylinder a4 positioned above the side of the discharge chute a2, wherein the upper end of the guide cylinder a4 is open, the open end of the guide cylinder a4 is connected with a feed hopper a5, the open end of the guide cylinder a4 is provided with a lower flange a40, the lower end of the feed hopper a5 is connected with an upper flange a50, an upper flange a50 is placed on the lower flange a40, and the upper flange a50 and the lower flange a40 are fixed together through a plurality of bolts.

One side of the material guiding cylinder a4 is connected with a horizontally arranged discharging cylinder a6, and two extruding screws a7 inserted into the discharging cylinder a6, and one end of the extruding screw a7 extends into the material guiding cylinder a4 to be rotatably connected with the material guiding cylinder a4, the extruding screws a7 of the embodiment are two and located in the same horizontal plane, and the two extruding screws a7 rotate simultaneously.

A blanking hopper a8 is connected to the discharging end of a discharging cylinder a6, the lower end of a blanking hopper a8 is communicated with the upper side of the feeding end of a discharging groove a2, a material stirring shaft a41 positioned above a material extruding screw a7 is connected to a guide cylinder a4, one end of the material stirring shaft a41 is extended to the lower side of the feeding hopper a5, the material stirring shaft a41 and the material extruding screw a7 are connected with the same power driving mechanism a9, and a material stirring sheet a42 is connected to one end of the material stirring shaft a41 extended to the lower side of the feeding hopper a 5.

The rotation of dialling tablet a42 can prevent the disconnected confession of bamboo fiber material, and the crowded material screw rod a7 that sets up can force the bamboo fiber material not by the extrusion lead to the impaired of bamboo fiber material to and can form once mixing to the bamboo fiber material, simultaneously, utilize the difference in height to get into the bamboo fiber material to blown down tank a2, can form the scattering to the bamboo fiber material, and form quantitative feed through spiral discharge mechanism a3 at last, whole structure can improve the feed efficiency of bamboo fiber material, and feed quality.

The power driving mechanism a9 comprises a box body a91 fixed on the top of a supporting frame a1, one end of a material extruding screw a7 extends into the box body a91 and the material extruding screw a7 is rotatably connected with the box body a91, the other end of a material stirring shaft a41 extends into the box body a91 and the material stirring shaft a41 is rotatably connected with the box body a91, one end of the material extruding screw a7 extending into the box body a91 is connected with the other end of the material stirring shaft a41 through a linkage structure, and any one material extruding screw a7 is connected with a power driving motor a 92.

The material shifting piece a42 of this embodiment is Z-shaped, the material shifting shaft a41 rotates to drive 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 feeding hopper a 5.

Secondly, the kick-out shaft a41 is located right above the center between the two extrusion screws a 7.

The production line further comprises a cooling device e positioned between the extrusion die c and the granulating device d, wherein the cooling device e is used for cooling the continuous strip-shaped material extruded by the extrusion die c and sending the continuous strip-shaped material into the granulating device d for granulation.

Further, as shown in fig. 9 to 11, the cooling device e includes a cooling water tank e1 for receiving the continuous strip-shaped material extruded by the extrusion die c, a plurality of guide rollers e2 are disposed on the cooling water tank e1, and a plurality of annular guide grooves e20 are disposed on each guide roller e2 at intervals, at least one guide roller e2 of the plurality of guide rollers e2 is immersed in the cooling water tank e1, and the rest of the guide rollers e2 is located above the normal cooling water level of the cooling water tank e 1.

Two ends of the cooling water tank e1 are respectively provided with a guide roller e2 which is positioned above the normal cooling water level, and a guide roller e2 which is positioned in the middle of the cooling water tank e1 and is also positioned above the normal cooling water level.

Two guide rollers e2 positioned in the cooling water tank e1 are connected to the cooling water tank e 1. The two first guide rollers e2 are distributed at intervals on two sides of the first guide roller positioned in the middle of the cooling water tank e 1.

The cooling device e further comprises an air cooling groove e3 located at one end of the cooling water groove e1 far away from the extrusion die c, two guide rollers e4 located in the same horizontal plane are connected to the air cooling groove e3, a plurality of annular guide grooves e40 distributed at intervals are respectively arranged on each guide roller e4, a cooling fan cover e5 located above the position between the two guide rollers e4 is further connected to the air cooling groove e3, and an air outlet of the cooling fan cover e5 faces the guide rollers e4 and blows air downwards.

The cooling fan cover e5 is connected to the upper end of an air inlet pipe e6 which is vertically arranged, the air cooling groove e3 is arranged at the upper end of the air inlet pipe e6 and is positioned below the cooling fan cover e5, the lower end of the air inlet pipe e6 is connected with a blower e7, and the blower e7 is fixed on a fixed support e 8.

The bottom of the fixed support e8 is connected with four universal wheels with brakes so as to be convenient to move.

As shown in the figures 12-13 of the drawings,

an annular groove b31 is formed on the inner wall of one end of the conveying channel b1 close to the discharge groove a2, an annular groove b31 is positioned at the rear of the discharge port of the discharge groove a2, a rotating ring b3 is installed in the annular groove b31, the end faces of both ends of the rotating ring b3 are in rotary seal connection with the groove walls of both sides of the annular groove b31, an annular seal ring b32 is respectively arranged on the groove walls of both sides of the annular groove b31, a seal ring groove b34 is arranged on one end face of the groove bottom of the annular seal ring b32 far away from the annular groove b31, an outer convex ring b33 is respectively arranged on both end faces of the rotating ring b3, an outer convex ring b33 is clamped in the seal ring groove b34, and the notch width of the seal ring groove b34 is smaller than the thickness of the outer convex ring b33, which can form a seal, and at the same time two independent annular sealing spaces 37 are formed between the outer convex ring b33 clamped in the seal ring b 867 and the outer convex ring b 82, grease is added to the annular sealing space, which can be used for self-lubrication and friction reduction.

That is, the outer end surface of the outer protrusion ring b33 is fitted into the groove bottom of the sealing ring groove b34 to form a seal, and at the same time, the displacement of the rotating ring b3 is prevented.

The conveying channel b1 is also provided with a communication hole b35 communicated with the annular groove b31 and a driving gear b36 partially accommodated in the communication hole, the outer wall of the rotating ring b3 is provided with a plurality of external teeth which are uniformly distributed in the circumferential direction, the driving gear b36 is meshed with the external teeth, the driving gear b36 is fixed on the conveying channel b1 through a U-shaped frame, and meanwhile, the driving gear b36 is connected with a servo motor.

A plurality of helical blades b38 are arranged on the inner wall of the rotating ring b3, and the rotation direction of the helical blades is opposite to that of the helical blades of the feeding screw b 2.

The above structure is designed to force the material entering the conveying channel b1 from the discharging chute a2 to form mixing with the material in the conveying channel b 1.

The granulation process comprises the following steps:

s1, preparing materials, namely, weighing the raw materials including polylactic acid (PLA), bamboo fiber, talcum powder and an auxiliary agent according to a set amount for later use;

s2, feeding, namely feeding polylactic acid (PLA), talcum powder and an auxiliary agent into a main feeding device b, and feeding bamboo fibers into a bamboo fiber feeding device a, wherein the main feeding device b is arranged at the feeding end of a conveying channel b1, and the bamboo fiber feeding device a is arranged on the side part between the middle part and the discharging end of the conveying channel b 1;

80-90% of polylactic acid (PLA), 5-12% of talcum powder, 1-15% of bamboo fiber and 20% of auxiliary agent, wherein the auxiliary agent comprises nucleating agent, antioxidant, hydrolytic agent, fiber floating agent, antibacterial agent and the like.

S3, heating, starting a feeding screw b2 penetrating through a conveying channel b1, mixing polylactic acid (PLA), talcum powder and an auxiliary agent through the feeding screw b2, mixing bamboo fiber with the mixed polylactic acid (PLA), talcum powder and auxiliary agent through the feeding screw b2, and heating the conveying channel b1 and synchronously heating the raw materials by a heating mechanism in the process of mixing the raw materials;

s4, extruding, wherein the heated mixed raw material enters an extrusion die c, and the extrusion die c extrudes a plurality of continuous strip-shaped materials;

s5, cooling, namely, feeding the continuous strip-shaped materials into a cooling device e together for cooling, wherein the cooling comprises water cooling and air cooling;

and S6, granulating, and feeding the cooled continuous strip-shaped material into a granulating device d for granulation to finally obtain the composite material particles.

The mixing process is as follows:

feeding a mixing aid such as polylactic acid into a feeding hopper b11, mixing the materials by a screw rod b14, forcing the mixed materials into a conveying channel b1, heating the conveying channel b1 to force the mixed materials to be heated, and feeding bamboo fiber materials into a bamboo fiber feeding device a, namely feeding the bamboo fiber materials (powder) into a feeding hopper a 5;

starting the power driving mechanism a9, and enabling the bamboo fiber material to enter the material guide cylinder a 4;

with the rotation of the extruding screw a7, the bamboo fiber material is forced to enter the blanking hopper a8 from the discharging barrel a6, and finally the bamboo fiber material is forced to enter the final conveying channel b1 through the spiral discharging mechanism a3 arranged in the discharging groove a2 and is mixed with the mixed material, and the finally mixed material enters the next process.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (10)

1. The granulating production line of the polylactic acid bamboo fiber composite material comprises a conveying channel (b1), and a feed screw (b2) penetrating the conveying passage (b1), and a heating mechanism for heating the conveying passage (b1), the discharge end of the conveying channel (b1) is connected with an extrusion die (c) and a granulating device (d) positioned behind the extrusion die (c), it is characterized in that the feeding end of the conveying channel (b1) is connected with a main feeding device (b), the production line comprises a conveying channel (b1), a bamboo fiber feeding device (a) is connected to the side portion between the middle portion and the discharging end of the conveying channel (b1), the production line further comprises a cooling device (e) located between an extrusion die (c) and a granulating device (d), and the cooling device (e) is used for cooling continuous strip c-shaped materials extruded by the extrusion die (c) and sending the continuous strip materials into the granulating device (d) for granulation.

2. The polylactic acid bamboo fiber composite material granulation production line according to claim 1, wherein the cooling device (e) comprises a cooling water tank (e1) for receiving the continuous strip-shaped material extruded by the extrusion die (c), a plurality of guide rollers one (e2) are arranged on the cooling water tank (e1), a plurality of annular guide grooves one (e20) are arranged on each guide roller one (e2) at intervals, at least one guide roller one (e2) of the plurality of guide rollers one (e2) is immersed in the cooling water tank (e1), and the rest of the guide rollers one (e2) are positioned above the normal cooling water level of the cooling water tank (e 1).

3. The polylactic acid bamboo fiber composite material granulation production line according to claim 2, wherein the cooling device (e) further comprises an air cooling groove (e3) located at one end of the cooling water groove (e1) far away from the extrusion die (c), two guide rollers (e4) located in the same horizontal plane are connected to the air cooling groove (e3), a plurality of annular guide grooves (e40) distributed at intervals are respectively arranged on each guide roller (e4), a cooling fan housing (e5) located above the side between the two guide rollers (e4) is further connected to the air cooling groove (e3), and an air outlet of the cooling fan housing (e5) faces the guide rollers (e4) and blows air downwards.

4. The pelletizing 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 the air inlet pipe (e6) which is vertically arranged, the air cooling tank (e3) is installed at the upper end of the air inlet pipe (e6) and is located below the cooling air hood (e5), the lower end of the air inlet pipe (e6) is connected with the blower (e7), and the blower (e7) is fixed on the fixing bracket (e 8).

5. The polylactic acid bamboo fiber composite material granulation production line as claimed in claim 1, wherein the heating mechanism comprises a steam pipeline surrounding the outer wall of the conveying channel (b1), the steam pipeline is connected with a steam source, and a protective sleeve is sleeved outside the conveying channel (b1), and the steam pipeline is positioned between the conveying channel (b1) and the protective sleeve.

6. A pelletizing line of polylactic acid bamboo fiber composite material according to claim 1, characterized in that the main feeding device (b) comprises a feeding hopper (b11) disposed at the upper side of the feeding end of the conveying channel (b1) and connected by a plurality of columns (b10), the lower end of the feeding hopper (b11) is closed, the upper end of the feeding hopper (b11) is open, a discharging pipe (b12) is connected to one side of the lower end of the feeding hopper (b11), and a vertical hopper (b13) connected to the discharging end of the discharging pipe (b12), the lower end of the vertical hopper (b13) is communicated with the conveying channel (b1), a screw (b14) is arranged in the feeding hopper (b11) in a penetrating manner and a screw (b14) extends into the discharging pipe (b12), and the screw (b14) is connected with a feeding motor (b 15).

7. A pelletizing production line of polylactic acid bamboo fiber composite material according to claim 1, characterized in that the bamboo fiber feeding device (a) includes a supporting frame (a1), a horizontally disposed discharge chute (a2) is provided on the supporting frame (a1), the discharge end of the discharge chute (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 chute (a2), and a guide cylinder (a4) is provided above the discharge chute (a2), the upper end of the guide cylinder (a4) is open and is connected with a feed hopper (b11a5) at the opening of the guide cylinder (a4), a horizontally disposed discharge cylinder (a6) is connected to one side of the guide cylinder (a4), and two extruding screws (a7) inserted in the discharge cylinder (a6) and one end of the extruding screws (a7) extends into the guide cylinder (a4) and is connected with the guide cylinder (a4 a) to rotate, the two material extruding screws (a7) are located in the same horizontal plane and have the same rotating direction, the discharging end of the discharging barrel (a6) is connected with a blanking hopper (a8), the lower end of the blanking hopper (a8) is communicated with the upper side of the feeding end of the discharging groove (a2), the material guiding barrel (a4) is connected with a material stirring shaft (a41) located above the material extruding screws (a7), one end of the material stirring shaft (a41) is extended to the lower side of the feeding hopper (b11a5), the material stirring shaft (a41) and the material extruding screws (a7) are connected with the same power driving mechanism (a9), and one end of the material stirring shaft (a41) extended to the lower side of the feeding hopper (b11a5) is connected with a material stirring sheet (a 42).

8. The polylactic acid bamboo fiber composite material granulation production line according to claim 7, wherein the stirring sheet (a42) is Z-shaped, the stirring shaft (a41) rotates to drive the stirring sheet (a42) to rotate synchronously, and any end of the stirring sheet (a42) intermittently extends into the lower end of the feeding hopper (b11a 5).

9. The polylactic acid bamboo fiber composite material granulation production line as claimed in claim 7, wherein said supporting frame (a1) comprises a base (a10), a first horizontal plate (a11) connected to the top of the base (a10), a second horizontal plate (a13) connected to the first horizontal plate (a11) through four connecting posts (a12), a third horizontal plate (a15) connected to the second horizontal plate (a13) through four connecting posts (a14), said discharge chute (a2) and screw discharge mechanism (a3) fixed on the upper surface of the second horizontal plate (a13), and said guide cylinder (a4) and power driving mechanism (a9) fixed on the upper surface of the third horizontal plate (a 15).

10. The pelletization production line for polylactic acid bamboo fiber composite material according to claim 1, wherein said extrusion die (c) comprises a die body (c1) having a cavity, a feed inlet communicating with the transfer passage (b1) is provided at one side of the die body (c1), and a plurality of horizontal extrusion holes (c10) are provided at the other side of the die body (c1) opposite to the side where the feed inlet is provided.

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