Preparation equipment of high-temperature-resistant polylactic acid

Abstract

The utility model relates to preparation equipment of high-temperature-resistant polylactic acid, which comprises a reaction kettle, support frames are symmetrically mounted at the top of the reaction kettle, support discs are fixedly connected to the tops of the support frames, a mixing barrel is rotatably arranged between the two support discs, a feed hopper is fixedly connected to the outer side wall of one support disc, and a discharge hopper is fixedly connected to the outer side wall of the other support disc. And a discharge pipe communicated with the reaction kettle is arranged at the bottom of the other supporting disc. The utility model relates to the technical field of polylactic acid preparation. According to the preparation equipment of the high-temperature-resistant polylactic acid, materials in the material mixing barrel can be stirred through the arranged rotating shaft and the arranged stirring head, the mixing degree of the materials is improved, caked starch can be crushed in the stirring process through the arranged extrusion block, and the situation that the mixing of the materials is affected due to the fact that the starch is caked is avoided; the production efficiency of the high-temperature-resistant polylactic acid can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polylactic acid preparation, in particular to a preparation device for high-temperature resistant polylactic acid. Background Art

[0002] Heat-resistant polylactic acid is mainly obtained by modification. Currently, the modification methods for improving the heat resistance of polylactic acid include blending modification, chain structure modification, crystallization modification, etc. Among them, blending modification is further divided into polymer composite modification, filling modification, etc., chain structure modification is divided into copolymerization modification, crosslinking modification, etc., and crystallization modification includes nucleating agent modification, processing technology modification, etc. Processing technology modification improves its heat resistance by adjusting the processing method of polylactic acid (such as cooling temperature, annealing treatment, etc.).

[0003] In the prior art, polylactic acid is made from starch raw materials extracted from renewable plant resources (such as corn). During storage, starch will agglomerate due to increased humidity, resulting in agglomeration that cannot be dispersed when mixing plant starch, affecting the mixing of raw materials, thus affecting the modification effect of polylactic acid and the production quality and quality of high-temperature resistant polylactic acid. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a preparation device for high-temperature resistant polylactic acid, so as to solve the technical problems mentioned in the above background art.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] A preparation device for high-temperature resistant polylactic acid, including a reaction kettle. The top of the reaction kettle is symmetrically installed with support frames. The top of the support frames is fixedly connected with a support plate. A mixing cylinder is rotatably arranged between the two support plates. A feed hopper is fixedly connected to the outer side wall of one of the support plates, and a discharge pipe communicating with the reaction kettle is arranged at the bottom of the other support plate;

[0007] A screening cylinder is arranged inside the mixing cylinder. The outer side wall of the screening cylinder is evenly distributed with screening holes for screening materials. The two ends of the screening cylinder are respectively fixedly connected with the two support plates. A rotating shaft is rotatably arranged in the middle of the screening cylinder. A plurality of stirring heads are annularly and arrayedly distributed on the outer peripheral side of the rotating shaft. One end of the stirring head in contact with the inner side wall of the screening cylinder is fixedly connected with an extrusion block for crushing agglomerates;

[0008] The end of the rotating shaft and the mixing cylinder are connected through a transmission component, and a driving motor is fixedly connected to one side of the transmission component.

[0009] Furthermore, a gap for the passage of raw materials is left between the inner side wall of the mixing cylinder and the outer side wall of the screening cylinder, and a spiral blade for pushing the raw materials forward is arranged on the inner side wall of the mixing cylinder.

[0010] Further, the spiral sheet is spirally wound around the outer side of the screening cylinder with a curvature, and the length of the spiral sheet is the same as that of the screening cylinder.

[0011] Further, a elastic part is convexly formed on one side of the extrusion block close to the screening cylinder, and a smooth surface for rolling the agglomerates is machined on one side of the elastic part.

[0012] Further, the length of the elastic part is greater than the distance between the extrusion block and the screening cylinder, and a knocking block is fixedly connected to the end of the elastic part far away from the extrusion block.

[0013] Further, the transmission component includes a main gear and a sub-gear. Both the main gear and the sub-gear are rotatably arranged in the support disk where the feed hopper is installed. The two sides of the main gear are respectively fixedly connected to the output shaft of the driving motor and the end of the rotating shaft. The sub-gear meshes with the main gear, and tooth grooves meshing with the sub-gear are formed on the inner side wall of the mixing cylinder.

[0014] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0015] 1. For the preparation equipment of a kind of high-temperature resistant polylactic acid, through the arranged rotating shaft and stirring head, the materials in the mixing cylinder can be stirred to improve the mixing degree of the materials. The arranged extrusion block can crush the agglomerated starch during the stirring process, avoiding the influence of starch agglomeration on the mixing of the materials, and effectively improving the production efficiency of high-temperature resistant polylactic acid;

[0016] 2. For the preparation equipment of a kind of high-temperature resistant polylactic acid, by arranging a knocking block in the extrusion block, when the knocking block slides over the uneven inner wall of the screening cylinder due to the sieve holes, it can vibrate, so that when the knocking block slides, it knocks the inner wall of the screening cylinder, shaking off the starch blocked in the sieve holes of the screening cylinder, and avoiding the influence of starch blockage of the sieve holes on the screening efficiency of the screening cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0018] Figure 1 It is a schematic structural diagram of a preparation equipment of a kind of high-temperature resistant polylactic acid of the present utility model.

[0019] Figure 2 It is a schematic internal structure diagram of the mixing cylinder in the preparation equipment of a kind of high-temperature resistant polylactic acid of the present utility model.

[0020] Figure 3 This is a schematic structural diagram of a transmission component in a preparation device for high-temperature resistant polylactic acid of the present utility model.

[0021] Figure 4 This is a schematic structural diagram of a spiral blade in a preparation device for high-temperature resistant polylactic acid of the present utility model.

[0022] Figure 5 This is a schematic structural diagram of a stirring head in a preparation device for high-temperature resistant polylactic acid of the present utility model.

[0023] Figure 6 It is Figure 5 an enlarged view of part A in

[0024] In the figure, 1 is a reaction kettle; 2 is a support frame; 3 is a support disk; 4 is a mixing cylinder; 5 is a feed hopper; 6 is a discharge pipe; 7 is a screening cylinder; 8 is a rotating shaft; 9 is a stirring head; 10 is an extrusion block; 11 is a transmission component; 111 is a main gear; 112 is a sub-gear; 12 is a driving motor; 13 is a spiral blade; 14 is an elastic part; 15 is a smooth surface; 16 is a knocking block; 17 is a tooth groove. Specific embodiments

[0025] The following further elaborates on the present utility model with reference to the accompanying drawings.

[0026] Embodiment:

[0027] Referring to Figure 1 - Figure 6 , a preparation device for high-temperature resistant polylactic acid disclosed by the present utility model includes a reaction kettle 1. Symmetrically installed on the top of the reaction kettle 1 are support frames 2. Fixedly connected to the top of the support frames 2 is a support disk 3. Rotatably arranged between the two support disks 3 is a mixing cylinder 4. Fixedly connected to the outer side wall of one of the support disks 3 is a feed hopper 5. Arranged at the bottom of the other support disk 3 is a discharge pipe 6 communicating with the reaction kettle 1;

[0028] A screening cylinder 7 is arranged inside the mixing cylinder 4. The outer side wall of the screening cylinder 7 is evenly distributed with screening holes for screening materials. The two ends of the screening cylinder 7 are respectively fixedly connected to the two support disks 3. Rotatably arranged in the middle of the screening cylinder 7 is a rotating shaft 8. A plurality of stirring heads 9 are annularly arrayed on the outer peripheral side of the rotating shaft 8. Fixedly connected to one end of the stirring head 9 in contact with the inner side wall of the screening cylinder 7 is an extrusion block 10 for crushing agglomerates;

[0029] The end of the rotating shaft 8 and the mixing cylinder 4 are connected by a transmission component 11. Fixedly connected to one side of the transmission component 11 is a driving motor 12.

[0030] In this embodiment, observing Figure 1It can be found that a support frame 2 is fixedly connected to the top of the reactor 1, and a support plate 3 is fixedly connected to the support frame 2, so that a mixing barrel 4 is rotatably connected between the two support plates 3, so that the polylactic acid raw material can be rotated and mixed in the mixing barrel 4, and then enter the reactor 1 through the discharge pipe 6 on one side of the mixing barrel 4 to start preparing high-temperature resistant polylactic acid.

[0031] Since polylactic acid is made from starch raw materials from renewable plant resources (such as corn), starch materials will become damp and clump during storage, making it difficult for the raw materials of polylactic acid to disperse when mixed, resulting in uneven proportions of ingredients, which in turn affects the subsequent modification of polylactic acid and the preparation of high-temperature resistant polylactic acid. Figure 2 It can be found that a screening drum 7 is arranged in the mixing drum 4, and a rotating shaft 8 is rotatably arranged in the screening drum 7, and a plurality of stirring heads 9 are distributed in a ring array on the outer peripheral side of the rotating shaft 8. After the raw materials enter the mixing drum 4 through the feed hopper 5, the rotating shaft 8 is driven to rotate by the driving motor 12, so that the stirring head 9 stirs the raw materials to improve the mixing efficiency of the raw materials. The extrusion block 10 arranged at the end of the stirring head 9 in contact with the outer wall of the screening drum 7 can crush the agglomerated starch when the stirring head 9 stirs the material, thereby avoiding starch agglomeration and affecting the mixing effect, and further improving the mixing uniformity of the material, thereby ensuring the production efficiency of high temperature resistant polylactic acid.

[0032] In a further preferred embodiment of the present invention, Figure 2 and Figure 4 As shown, a gap for raw materials to pass through is reserved between the inner wall of the mixing cylinder 4 and the outer wall of the screening cylinder 7, and a spiral sheet 13 is provided on the inner wall of the mixing cylinder 4 for pushing the raw materials forward;

[0033] The spiral sheet 13 is wound around the outer side of the screening drum 7 in a curvature spiral, and the length of the spiral sheet 13 is the same as the length of the screening drum 7 .

[0034] In this embodiment, observe Figure 2 It can be found that by leaving a gap between the mixing drum 4 and the screening drum 7, the materials after being dispersed and mixed can fall into the gap between the mixing drum 4 and the screening drum 7. However, due to the small molecular gap between starch, the interaction force between starch particles is large, so that the starch cannot automatically slide down by setting the inclination angle to achieve feeding, which will seriously affect the feeding efficiency. Figure 4 It can be found that a spiral blade 13 is provided on the inner wall of the mixing barrel 4, and the spiral blade 13 is spirally wound on the outer side of the screening barrel 7, so that when the mixing barrel 4 is driven by the transmission assembly 11 to rotate, the spiral blade 13 can push the mixed material forward, so that the mixed material can enter the reactor 1 through the discharge pipe 6, which can effectively ensure the material transportation efficiency.

[0035] In a further preferred embodiment of the present utility model, as Figure 5 and Figure 6 shown, a elastic part 14 is formed by protruding on one side of the extrusion block 10 close to the screening cylinder 7, and a smooth surface 15 for rolling the agglomerates is machined on one side of the elastic part 14;

[0036] The length of the elastic part 14 is greater than the distance between the extrusion block 10 and the screening cylinder 7, and a knocking block 16 is fixedly connected to one end of the elastic part 14 away from the extrusion block 10.

[0037] In this embodiment, by providing the elastic part 14 on one side of the extrusion block 10 close to the screening cylinder 7, and machining the side wall of the elastic part 14 with the smooth surface 15 for rolling the starch agglomerates, it can avoid the starch sticking to the extrusion block 10 after the extrusion block 10 crushes the agglomerates, thereby avoiding the loss of polylactic acid raw materials and further improving the production efficiency of polylactic acid.

[0038] And since there is a probability that the starch agglomerates are blocked at the sieve holes of the screening cylinder 7 when being crushed, which affects the screening efficiency of the screening cylinder 7. Therefore, the length of the elastic part 14 is greater than the distance between the extrusion block 10 and the screening cylinder 7, so that the elastic part 14 deforms under pressure during use, and the end of the elastic part 14 bends and deforms to increase the acting force with the screening cylinder 7. Subsequently, a knocking block 16 is provided at the end of the elastic part 14, which can make the knocking block 16 vibrate when sliding over the uneven surface of the screening cylinder 7 caused by the sieve holes, so that the knocking block 16 impacts the screening cylinder 7 and shakes off the starch in the sieve holes of the screening cylinder 7, effectively ensuring the screening efficiency of the screening cylinder 7.

[0039] In a further preferred embodiment of the present utility model, as Figure 3 shown, the transmission assembly 11 includes a main gear 111 and a sub-gear 112. The main gear 111 and the sub-gear 112 are both rotatably arranged in the support disk 3 where the feed hopper 5 is installed. Among them, both sides of the main gear 111 are fixedly connected to the output shaft of the drive motor 12 and the end of the rotating shaft 8 respectively. The sub-gear 112 meshes with the main gear 111, and a tooth groove 17 meshing with the sub-gear 112 is formed on the inner side wall of the mixing cylinder 4.

[0040] In this embodiment, by providing the main gear 111 and the sub-gear 112, the rotating shaft 8 and the mixing cylinder 4 can be synchronously driven to rotate when the drive motor 12 operates, so that while the rotating shaft 8 drives the stirring head 9 to mix the materials, the mixing cylinder 4 transports the mixed materials to the reaction kettle 1, effectively improving the production efficiency of high-temperature resistant polylactic acid.

[0041] The embodiments of this specific implementation manner are all preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A preparation device for high temperature resistant polylactic acid, comprising a reaction kettle (1), characterized in that: A support frame (2) is symmetrically mounted on the top of the reactor (1); a support plate (3) is fixedly connected to the top of the support frame (2); a mixing cylinder (4) is rotatably arranged between the two support plates (3); a feed hopper (5) is fixedly connected to the outer wall of one of the support plates (3); and a discharge pipe (6) connected to the reactor (1) is arranged at the bottom of the other support plate (3); A screening cylinder (7) is arranged inside the mixing cylinder (4), and sieve holes for screening materials are evenly distributed on the outer wall of the screening cylinder (7), and two ends of the screening cylinder (7) are respectively fixedly connected to two support plates (3), and a rotating shaft (8) is rotatably arranged in the middle of the screening cylinder (7), and a plurality of stirring heads (9) are distributed in a circular array on the outer peripheral side of the rotating shaft (8), and an extrusion block (10) for crushing agglomerates is fixedly connected to the end of the stirring head (9) that contacts the inner wall of the screening cylinder (7); The end of the rotating shaft (8) and the mixing barrel (4) are connected via a transmission assembly (11), and a driving motor (12) is fixedly connected to one side of the transmission assembly (11).

2. The preparation equipment of a high temperature resistant polylactic acid according to claim 1, characterized in that: A gap for raw materials to pass through is reserved between the inner wall of the mixing cylinder (4) and the outer wall of the screening cylinder (7), and a spiral blade (13) is provided on the inner wall of the mixing cylinder (4) for pushing the raw materials forward.

3. The preparation equipment of a high temperature resistant polylactic acid according to claim 2, characterized in that: The spiral sheet (13) is wound in a curvature spiral around the outside of the screening cylinder (7), and the length of the spiral sheet (13) is the same as the length of the screening cylinder (7).

4. The preparation equipment of a high temperature resistant polylactic acid according to claim 3, characterized in that: A side of the squeezing block (10) close to the screening cylinder (7) is convexly formed with an elastic portion (14), and one side of the elastic portion (14) is processed with a smooth surface (15) for crushing agglomerates.

5. The equipment for preparing high temperature resistant polylactic acid according to claim 4, characterized in that: The length of the elastic part (14) is greater than the distance between the extrusion block (10) and the screening drum (7), and a knocking block (16) is fixedly connected to the end of the elastic part (14) at one side away from the extrusion block (10).

6. The equipment for preparing high temperature resistant polylactic acid according to claim 1, characterized in that: The transmission assembly (11) comprises a main gear (111) and a sub-gear (112), wherein the main gear (111) and the sub-gear (112) are both rotatably arranged in the support plate (3) on which the feed hopper (5) is mounted, wherein two sides of the main gear (111) are respectively fixedly connected to the output shaft of the drive motor (12) and the end of the rotating shaft (8), the sub-gear (112) meshes with the main gear (111), and the inner side wall of the mixing barrel (4) is provided with a tooth groove (17) in which the sub-gear (112) meshes.

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