CN112873610A

CN112873610A - Colored polylactic acid particle manufacturing equipment and preparation method thereof

Info

Publication number: CN112873610A
Application number: CN202110034522.3A
Authority: CN
Inventors: 张烨
Original assignee: Jiutianqihong Jiangsu Testing Co ltd
Current assignee: Jiutianqihong Jiangsu Testing Co ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-06-01

Abstract

The invention discloses colored polylactic acid particle manufacturing equipment and a preparation method thereof, wherein the colored polylactic acid particle manufacturing equipment comprises a box body assembly, an extruder, an underwater granulator and a mixing assembly, a polylactic acid raw material is added into the box body through a first feeding pipe by arranging a quantitative feeding assembly, a pigment raw material liquid is placed into a quantitative pipe, the calibration of the pigment raw material liquid is carried out through a graduated scale, the adding accuracy of the pigment raw material liquid is ensured, a blanking valve is opened to add the pigment raw material liquid into the box body, the quantitative addition of the pigment raw material liquid is facilitated, other equipment is not required to be used for auxiliary operation, and the manufacturing cost of the colored polylactic acid particles is reduced; through setting up mixing assembly, hybrid motor switch-on commercial power circular telegram operation, hybrid motor drives the swing arm and rotates, and through first hybrid board, second hybrid board and third hybrid board mix polylactic acid raw materials and pigment raw materials liquid and make polylactic acid raw materials and pigment raw materials liquid misce bene, improve the production quality of coloured polylactic acid particle.

Description

Colored polylactic acid particle manufacturing equipment and preparation method thereof

Technical Field

The invention relates to the technical field of polylactic acid production, in particular to equipment for manufacturing colored polylactic acid particles and a preparation method thereof.

Background

The polylactic acid is a biological high polymer material prepared by using crops such as cassava, sorghum, corn, straw and the like as raw materials through production processes such as fermentation, purification, polymerization and the like, the energy consumption for production is 30 to 50 percent lower than that of a synthetic polymer prepared by using a petroleum product as a raw material, the polylactic acid and the physical properties of the product thereof are stable under normal temperature and humidity conditions, the waste of the polylactic acid can be degraded into carbon dioxide and water through the microbial action in soil or seawater, and then the carbon dioxide and the water can enter the natural general circulation infinitely and repeatedly through plant photosynthesis, so the polylactic acid is an ideal green high polymer material, has a plurality of applications, can be used in the automobile field, the disposable article field, the electronic field and the like, for example, in the disposable article field, the polylactic acid has the characteristics of absolute harmlessness to the human body, so that the polylactic acid in the disposable tableware, The Chinese patent with the patent number of CN 110922613A discloses a colored polylactic acid particle and a preparation method thereof, which simplify the production process flow of the existing colored polylactic acid product, reduce the energy consumption in the production process of the colored polylactic acid product and reduce the raw material cost of the colored polylactic acid product, but the existing colored polylactic acid particle manufacturing equipment is not convenient for the quantitative addition of pigment raw material liquid, and the equipment in the equipment is required to perform auxiliary operation during the quantitative addition, so that the utilization rate of the manufacturing equipment is reduced, and the manufacturing cost of the colored polylactic acid particle is improved.

Therefore, the colored polylactic acid particle manufacturing equipment and the preparation method thereof are provided.

Disclosure of Invention

The invention aims to provide colored polylactic acid particle manufacturing equipment and a preparation method thereof, wherein a quantitative feeding assembly is arranged, a quantitative polylactic acid raw material is added into a box body through a first feeding pipe, a quantitative pigment raw material liquid is placed into a quantitative pipe, the pigment raw material liquid is calibrated through a graduated scale, the adding accuracy of the pigment raw material liquid is ensured, a blanking valve is opened to add the pigment raw material liquid into the box body, the pigment raw material liquid is conveniently and quantitatively added, other equipment is not needed for auxiliary operation, the utilization rate of the manufacturing equipment is improved, the manufacturing cost of the colored polylactic acid particles is reduced, the mixing assembly is arranged, a mixing motor is connected with mains supply to run, the mixing motor drives a rotating rod to rotate, the polylactic acid raw material and the pigment raw material liquid are mixed through a first mixing plate, a second mixing plate and a third mixing plate, the polylactic acid raw material and the pigment raw material liquid are mixed through a third mixing plate, make polylactic acid raw materials and pigment raw materials liquid misce bene, avoid look polylactic acid particle phenomenon of colour difference to appear, improve the production quality of look polylactic acid particle, scraper blade and stock guide of setting, when the swing arm rotates, the scraper blade is advanced along the inner wall of box, the scraper blade will be attached to the raw materials of box inner wall and scrape down, avoid the raw materials to appear caking and the phenomenon that bonds at the inner wall of box, guarantee mixing element's mixed effect, and avoid the waste of raw materials resource, the stock guide plays the effect of water conservancy diversion to the raw materials, make the quick inside that gets into the extruder from the discharging pipe of the quick raw materials of misce bene, the work efficiency of pelletization equipment is improved, in order to solve the problem that mentions in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the colored polylactic acid particle manufacturing equipment comprises a box body assembly, an extruder, an underwater granulator and a mixing assembly, wherein the extruder is arranged below the box body assembly; the underwater granulator is arranged at the tail end of the extruder, and one end of the underwater granulator, which is close to the box body assembly, is communicated with the interior of the extruder; the mixing component is arranged above the box body component, and the lower end of the mixing component is positioned in the box body component;

the box body assembly comprises a box body, a first feeding pipe, a material guide plate, a discharging pipe and a quantitative feeding assembly, wherein the first feeding pipe is arranged on one side above the box body, and the lower end of the first feeding pipe is communicated with the interior of the box body; the quantitative feeding assembly is arranged on the other side above the box body; the material guide plate is arranged on one side, close to the first feeding pipe, of the lower part of the inner part of the box body; the discharging pipe is installed on one side, close to the quantitative feeding assembly, below the box body, and is provided with a valve.

Preferably, a rotary cover is arranged above the first feeding pipe; the upper end of the material guide plate is inclined, and one end of the material guide plate close to the first feeding pipe is higher than one end of the material guide plate close to the quantitative feeding assembly; the upper end of the discharge pipe is communicated with the interior of the box body.

Preferably, the quantitative feeding assembly comprises a second feeding pipe, a discharging valve, a quantitative pipe and a dividing ruler, and the second feeding pipe is arranged on one side, far away from the first feeding pipe, above the box body; the discharging pipe is arranged in the middle above the second feeding pipe; the quantitative pipe is arranged above the blanking pipe; the graduated scale is embedded at one end, close to the first feeding pipe, of the front side of the quantitative pipe; the blanking valve is arranged on the blanking pipe.

Preferably, the upper end of the second feeding pipe is closed, and the lower end of the second feeding pipe is communicated with the interior of the box body; the discharging pipe is communicated with the inside of the second feeding pipe; the upper end of the quantitative pipe is open, and the quantitative pipe is made of acrylic materials; the size of the graduated scale is matched with that of the quantitative tube.

Preferably, the mixing assembly comprises a mixing motor, a rotary rod, a first mixing plate, a scraper, a second mixing plate and a third mixing plate, the mixing motor is arranged above the box body assembly, and an output shaft of the mixing motor penetrates into the box body; the lower end of the rotary rod is arranged at the middle position below the inner part of the box body through a shaft sleeve, and the upper end of the rotary rod is connected with an output shaft of the mixing motor through a coupler; the first mixing plate is a plurality of, and the first mixing plate is arranged on two sides of the rotating rod.

Preferably, the scraping plates are multiple and are arranged at the tail end of the first mixing plate; the second mixing plates are arranged on two sides of the rotary rod and are respectively positioned below the first mixing plates; the third mixed plate is provided with a plurality of third mixed plates which are arranged at the upper side and the lower side of the second mixed plate.

Preferably, the rotating rod is cylindrical; the first mixing plate is perpendicular to the rotary rod; the outer side of the scraper is arc-shaped, and the scraper is attached to the inner wall of the box body; the second mixing plate is positioned between the scraper and the first mixing plate; the third mixing plate is arranged perpendicular to the second mixing plate, and the third mixing plate is located between the first mixing plate and the second mixing plate.

A preparation method of colored polylactic acid particle manufacturing equipment comprises the following steps:

step S101: proportioning, namely adding a certain amount of polylactic acid raw material into the box body through a first feeding pipe, putting a certain amount of pigment raw material liquid into a certain amount of pipe, calibrating the pigment raw material liquid through a graduated scale to ensure the adding accuracy of the pigment raw material liquid, and opening a blanking valve to add the pigment raw material liquid into the box body;

step S102: mixing the raw materials, switching on a mixing motor to be powered on and run by commercial power, driving a rotating rod to rotate by the mixing motor, and mixing the polylactic acid raw material and the pigment raw material liquid by a first mixing plate, a second mixing plate and a third mixing plate to uniformly mix the polylactic acid raw material and the pigment raw material liquid;

step S103: granulating, opening a valve at a discharging pipe, conveying uniformly mixed raw materials into an extruder through the discharging pipe, heating and mixing the raw materials, making the molten raw materials into strips through the extruder, and performing granulating operation through an underwater granulator to achieve the purpose of granulating.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, through arranging the adjusting assembly, before the measurement of the pay-off, the levelness is adjusted, the adjusting knob is unscrewed, the length of the adjusting rod in the sleeve rod is adjusted, so that the purpose of adjusting the levelness of the measurement pay-off device is achieved, when the levelness displayed by the bubble level indicator reaches the standard, the adjusting knob is screwed, the structure is simple, the operation is convenient and fast, and the measurement precision of the measurement pay-off device is improved;

2. according to the invention, by arranging the displacement assembly and the clamping assembly, when the laser pay-off instrument needs to move in a short distance, the clamping plate is pushed to move in the clamping groove, so that the laser pay-off instrument can move in a short distance conveniently, the levelness of the measuring pay-off device is not required to be adjusted repeatedly, the working efficiency of the measuring pay-off device is improved, the guide plate plays a role in conducting and limiting the clamping plate, and the moving stability of the clamping plate is improved;

3. according to the invention, the sleeve and the fastening hole are arranged, the lower end of the laser pay-off instrument is sleeved in the sleeve, when the laser pay-off instrument needs to be rotated, the wing-shaped bolt at the fastening hole is unscrewed, the laser pay-off instrument is rotated to a proper angle, and the wing-shaped bolt at the fastening hole is screwed, so that the angle of the laser pay-off instrument can be conveniently adjusted, and the application range of the laser pay-off instrument is expanded.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the case assembly of the present invention;

FIG. 3 is a schematic view of the structure of the constant feed block of the present invention;

FIG. 4 is a schematic structural view of a hybrid module of the present invention;

FIG. 5 is a block flow diagram of the present invention.

In the figure: 1. a case assembly; 11. a box body; 12. a first feed tube; 13. a material guide plate; 14. a discharge pipe; 15. a dosing assembly; 151. a second feed tube; 152. a discharging pipe; 153. a blanking valve; 154. a dosing tube; 155. a graduated scale; 2. an extruder; 3. an underwater pelletizer; 4. a mixing assembly; 41. a hybrid motor; 42. rotating the rod; 43. a first mixing plate; 44. a squeegee; 45. a second mixing plate; 46. a third mixing plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: a colored polylactic acid particle manufacturing device is shown in figure 1 and comprises a box body component 1, an extruder 2, an underwater granulator 3 and a mixing component 4, wherein the extruder 2 is arranged below the box body component 1; the underwater granulator 3 is arranged at the tail end of the extruder 2, and one end, close to the box body assembly 1, of the underwater granulator 3 is communicated with the interior of the extruder 2; the mixing component 4 is arranged above the box body component 1, and the lower end of the mixing component 4 is positioned in the box body component 1;

the box body assembly 1 comprises a box body 11, a first feeding pipe 12, a material guide plate 13, a discharging pipe 14 and a quantitative feeding assembly 15, wherein the first feeding pipe 12 is arranged on one side above the box body 11, and the lower end of the first feeding pipe 12 is communicated with the interior of the box body 11; the quantitative feeding assembly 15 is arranged at the other side above the box body 11; the material guide plate 13 is arranged on one side, close to the first feeding pipe 12, below the inner part of the box body 11; the discharge pipe 14 is arranged on one side of the lower part of the box body 11 close to the quantitative feeding assembly 15, and the discharge pipe 14 is provided with a valve.

Specifically, as shown in fig. 2, a screw cap is arranged above the first feeding pipe 12; the upper end of the material guide plate 13 is inclined, and one end of the material guide plate 13 close to the first feeding pipe 12 is higher than one end of the material guide plate 13 close to the quantitative feeding assembly 15; the upper end of the discharge pipe 14 communicates with the inside of the tank body 11.

Through adopting above-mentioned technical scheme, stock guide 13 plays the effect of water conservancy diversion to the raw materials, makes the quick inside that gets into extruder 2 from discharging pipe 14 all of raw materials of misce bene, improves the work efficiency of pelletization equipment.

Specifically, as shown in fig. 3, the quantitative feeding assembly 15 includes a second feeding pipe 151, a blanking pipe 152, a blanking valve 153, a quantitative pipe 154 and a scale 155, wherein the second feeding pipe 151 is installed on a side of the box 11 away from the first feeding pipe 12; the feeding pipe 152 is installed at an intermediate position above the second feeding pipe 151; the dosing pipe 154 is installed above the blanking pipe 152; the graduated scale 155 is embedded at one end of the front side of the quantitative pipe 154 close to the first feeding pipe 12; the discharging valve 153 is installed on the discharging pipe 152.

Through adopting above-mentioned technical scheme, add quantitative polylactic acid raw materials to the inside of box 11 through first inlet pipe 12, put into quantitative pipe 154 with quantitative pigment raw materials liquid, carry out the demarcation of pigment raw materials liquid through scale 155, guarantee the degree of accuracy that pigment raw materials liquid adds, open unloading valve 153 and add pigment raw materials liquid to the box 11 in, the ration of the pigment raw materials liquid of being convenient for is added, need not use other equipment to carry out the auxiliary operation, the utilization ratio of manufacturing equipment is improved, the manufacturing cost of colored polylactic acid particle is reduced.

Specifically, as shown in fig. 3, the upper end of the second feeding pipe 151 is closed, and the lower end of the second feeding pipe 151 is communicated with the inside of the box body 11; the feeding pipe 152 is communicated with the inside of the second feeding pipe 151; the upper end of the quantitative tube 154 is open, and the quantitative tube 154 is made of acrylic material; the scale 155 is sized to match the sizing tube 154.

Through adopting above-mentioned technical scheme, the dosage pipe 154 adopts the ya keli material, is convenient for cooperate scale 155 to carry out the demarcation of pigment raw materials liquid, guarantees the degree of accuracy that pigment raw materials liquid added.

Specifically, as shown in fig. 4, the mixing assembly 4 includes a mixing motor 41, a rotary rod 42, a first mixing plate 43, a scraper 44, a second mixing plate 45 and a third mixing plate 46, the mixing motor 41 is installed above the box assembly 1, and an output shaft of the mixing motor 41 penetrates into the box 11; the lower end of the rotary rod 42 is arranged at the middle position below the inner part of the box body 11 through a shaft sleeve, and the upper end of the rotary rod 42 is connected with an output shaft of the mixing motor 41 through a coupler; the first mixing plate 43 is provided in plurality, and the first mixing plate 43 is installed at both sides of the rotary rod 42.

Through adopting above-mentioned technical scheme, hybrid motor 41 switches on the commercial power circular telegram and moves, and hybrid motor 41 drives the rotation pole 42 and rotates, and through first hybrid board 43, second hybrid board 45 and third hybrid board 46 mix polylactic acid raw materials and pigment raw materials liquid, adopt tertiary hybrid board to carry out the mixture of polylactic acid raw materials and pigment raw materials liquid, make polylactic acid raw materials and pigment raw materials liquid misce bene, avoid look polylactic acid particle to appear the phenomenon of colour difference, improve the production quality of coloured polylactic acid particle.

Specifically, as shown in fig. 4, a plurality of the scrapers 44 are adopted, and the scrapers 44 are installed at the end of the first mixing plate 43; the number of the second mixing plates 45 is multiple, and the second mixing plates 45 are installed at two sides of the rotating rod 42, and the second mixing plates 45 are respectively positioned below the first mixing plates 43; the number of the third mixing plates 46 is multiple, and the third mixing plates 46 are arranged on the upper side and the lower side of the second mixing plate 45; the rotary rod 42 is cylindrical; the first mixing plate 43 is arranged perpendicular to the rotary rod 42; the outer side of the scraper 44 is arc-shaped, and the scraper 44 is attached to the inner wall of the box body 11; the second mixing plate 45 is positioned between the scraper 44 and the first mixing plate 43; the third mixing plate 46 is arranged perpendicular to the second mixing plate 45, and the third mixing plate 46 is located between the first mixing plate 43 and the second mixing plate 45.

Through adopting above-mentioned technical scheme, when swing arm 42 rotated, scraper blade 44 marched along the inner wall of box 11, and scraper blade 44 will be attached to the raw materials of box 11 inner wall and scrape down, avoided the raw materials caking to appear in the inner wall of box 11 and the phenomenon of bonding, guaranteed mixing assembly 4's mixed effect, and avoided the waste of raw materials resource.

A method for manufacturing colored polylactic acid particles, as shown in fig. 5, the method for manufacturing colored polylactic acid particles comprises the following steps:

step S101: proportioning, namely adding a certain amount of polylactic acid raw material into the box body 11 through the first feeding pipe 12, putting a certain amount of pigment raw material liquid into the quantitative pipe 154, calibrating the pigment raw material liquid through a graduated scale to ensure the adding accuracy of the pigment raw material liquid, and opening the blanking valve 153 to add the pigment raw material liquid into the box body 11;

step S102: mixing the raw materials, wherein a mixing motor 41 is connected with commercial power to be powered on, the mixing motor 41 drives a rotary rod 42 to rotate, and the polylactic acid raw material and the pigment raw material liquid are mixed through a first mixing plate 43, a second mixing plate 45 and a third mixing plate 46 to be uniformly mixed;

step S103: and (3) granulating, namely opening a valve at the discharge pipe 14, conveying the uniformly mixed raw materials into the extruder 2 through the discharge pipe 14, heating and mixing the raw materials, making the molten raw materials into strips through the extruder, and performing granulating operation through the underwater granulator 3 to achieve the purpose of granulating.

The working principle is as follows: when the device is used, a certain amount of polylactic acid raw material is added into the box body 11 through the first feeding pipe 12, a certain amount of pigment raw material liquid is placed into the quantitative pipe 154, the pigment raw material liquid is calibrated through the graduated scale 155, the adding accuracy of the pigment raw material liquid is ensured, the pigment raw material liquid is added into the box body 11 by opening the blanking valve 153, the pigment raw material liquid is conveniently and quantitatively added, other equipment is not needed for auxiliary operation, the utilization rate of manufacturing equipment is improved, the manufacturing cost of colored polylactic acid particles is reduced, the mixing motor 41 is powered on by commercial power, the mixing motor 41 drives the rotary rod 42 to rotate, the polylactic acid raw material and the pigment raw material liquid are mixed through the first mixing plate 43, the second mixing plate 45 and the third mixing plate 46, the polylactic acid raw material and the pigment raw material liquid are mixed through the three-stage mixing plates, so that the polylactic acid raw material and the pigment raw material liquid are uniformly mixed, avoid the phenomenon that chromatic aberration appears in colored polylactic acid particle, improve the production quality of colored polylactic acid particle, when bull stick 42 rotates, scraper blade 44 is marchd along the inner wall of box 11, scraper blade 44 will be attached to the raw materials of box 11 inner wall and scrape down, avoid the raw materials phenomenon that caking and bonding appear in the inner wall of box 11, guarantee the mixed effect of hybrid module 4, and avoid the waste of raw materials resource, open the valve of discharging pipe 14 department, carry the raw materials of misce bene to extruder 2 in through discharging pipe 14, heat and mix the raw materials, make the strip with the fused raw materials through the extruder, carry out the grain cutting operation through underwater granulator 3, reach the purpose of granulation.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A colored polylactic acid particle manufacturing equipment is characterized in that: the underwater granulator comprises a box body assembly (1), an extruder (2), an underwater granulator (3) and a mixing assembly (4), wherein the extruder (2) is arranged below the box body assembly (1); the underwater granulator (3) is arranged at the tail end of the extruder (2), and one end, close to the box body assembly (1), of the underwater granulator (3) is communicated with the interior of the extruder (2); the mixing component (4) is arranged above the box body component (1), and the lower end of the mixing component (4) is positioned in the box body component (1);

the box body assembly (1) comprises a box body (11), a first feeding pipe (12), a material guide plate (13), a discharging pipe (14) and a quantitative feeding assembly (15), wherein the first feeding pipe (12) is arranged on one side above the box body (11), and the lower end of the first feeding pipe (12) is communicated with the interior of the box body (11); the quantitative feeding assembly (15) is arranged on the other side above the box body (11); the material guide plate (13) is arranged on one side, close to the first feeding pipe (12), of the lower part of the inner part of the box body (11); the discharge pipe (14) is arranged on one side, close to the quantitative feeding assembly (15), below the box body (11), and the discharge pipe (14) is provided with a valve.

2. The colored polylactic acid particle production apparatus according to claim 1, wherein: a rotary cover is arranged above the first feeding pipe (12); the upper end of the material guide plate (13) is inclined, and one end, close to the first feeding pipe (12), of the material guide plate (13) is higher than one end, close to the quantitative feeding assembly (15), of the material guide plate (13); the upper end of the discharge pipe (14) is communicated with the interior of the box body (11).

3. The colored polylactic acid particle production apparatus according to claim 1, wherein: the quantitative feeding assembly (15) comprises a second feeding pipe (151), a blanking pipe (152), a blanking valve (153), a quantitative pipe (154) and a graduated scale (155), wherein the second feeding pipe (151) is arranged on one side, far away from the first feeding pipe (12), above the box body (11); the blanking pipe (152) is arranged at the middle position above the second feeding pipe (151); the quantitative pipe (154) is arranged above the blanking pipe (152); the graduated scale (155) is embedded at one end of the front side of the quantitative pipe (154) close to the first feeding pipe (12); the blanking valve (153) is arranged on the blanking pipe (152).

4. The colored polylactic acid particle production apparatus according to claim 3, wherein: the upper end of the second feeding pipe (151) is closed, and the lower end of the second feeding pipe (151) is communicated with the interior of the box body (11); the discharge pipe (152) is communicated with the interior of the second feed pipe (151); the upper end of the quantitative tube (154) is open, and the quantitative tube (154) is made of acrylic material; the scale (155) is matched with the quantitative tube (154) in size.

5. The colored polylactic acid particle production apparatus according to claim 1, wherein: the mixing assembly (4) comprises a mixing motor (41), a rotary rod (42), a first mixing plate (43), a scraper (44), a second mixing plate (45) and a third mixing plate (46), the mixing motor (41) is arranged above the box body assembly (1), and an output shaft of the mixing motor (41) penetrates into the box body (11); the lower end of the rotary rod (42) is arranged at the middle position below the inner part of the box body (11) through a shaft sleeve, and the upper end of the rotary rod (42) is connected with an output shaft of the mixing motor (41) through a coupler; the first mixing plates (43) are arranged in a plurality, and the first mixing plates (43) are arranged on two sides of the rotary rod (42).

6. The colored polylactic acid particle production apparatus according to claim 5, wherein: the scraping plates (44) are multiple, and the scraping plates (44) are arranged at the tail end of the first mixing plate (43); the number of the second mixing plates (45) is multiple, the second mixing plates (45) are arranged on two sides of the rotary rod (42), and the second mixing plates (45) are respectively positioned below the first mixing plates (43); the third mixing plate (46) is provided with a plurality of mixing plates, and the third mixing plate (46) is arranged at the upper side and the lower side of the second mixing plate (45).

7. The colored polylactic acid particle production apparatus according to claim 5, wherein: the rotary rod (42) is cylindrical; the first mixing plate (43) is arranged perpendicular to the rotary rod (42); the outer side of the scraper (44) is arc-shaped, and the scraper (44) is attached to the inner wall of the box body (11); the second mixing plate (45) is located between the scraper (44) and the first mixing plate (43); the third mixing plate (46) is arranged perpendicular to the second mixing plate (45), and the third mixing plate (46) is located between the first mixing plate (43) and the second mixing plate (45).

8. A preparation method of colored polylactic acid particle manufacturing equipment is characterized in that: the preparation method of the colored polylactic acid particle manufacturing equipment comprises the following steps:

step S101: proportioning, namely adding a certain amount of polylactic acid raw material into a box body (11) through a first feeding pipe (12), putting a certain amount of pigment raw material liquid into a quantitative pipe (154), calibrating the pigment raw material liquid through a graduated scale, ensuring the adding accuracy of the pigment raw material liquid, and opening a blanking valve (153) to add the pigment raw material liquid into the box body (11);

step S102: mixing raw materials, wherein a mixing motor (41) is connected with commercial power to be electrified and operated, the mixing motor (41) drives a rotating rod (42) to rotate, and a polylactic acid raw material and a pigment raw material liquid are mixed through a first mixing plate (43), a second mixing plate (45) and a third mixing plate (46) to be uniformly mixed;

step S103: and (3) granulating, namely opening a valve at the discharge pipe (14), conveying the uniformly mixed raw materials into the extruder (2) through the discharge pipe (14), heating and mixing the raw materials, making the molten raw materials into strips through the extruder, and performing granulating operation through the underwater granulator (3) to achieve the purpose of granulating.