Hot melting device for recycling and reusing waste plastic

Abstract

The invention relates to the technical field of waste plastic recycling and reusing processing, in particular to a hot melting device for waste plastic recycling and reusing processing, the hot melting device for waste plastic recycling and reusing processing comprises a rack, a machine barrel, a feeding hopper, a discharging pipe, a screw rod and a driving mechanism, the screw rod comprises a shaft body and a thread group which are connected with each other, the thread group comprises a main external thread and a mixing thread, a thread groove of the main external thread is provided with a feeding area, a mixing area and a plasticizing area, the depth of the mixing area is gradually shallower from the tail end of the feeding area to the starting end of the plasticizing area, the mixing thread is arranged at the position of the mixing area, and mixing grooves are formed in the mixing thread at intervals in the spiral direction of the mixing thread; and the thread groove is divided into a liquid flow groove and a solid flow groove by the separation strips. According to the hot melting device for recycling and reusing the waste plastic, the purposes of keeping the fluidity of a solution and improving the plasticizing quality of the solution are achieved while the solution is controlled to be plasticized gently and smoothly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste plastic recycling and reprocessing, in particular to a hot melting device for waste plastic recycling and reprocessing. BACKGROUND

[0002] In the process of waste plastic recycling and reprocessing, the hot melting device generally melts and compresses the plastic blocks continuously by the screw rod, so that the plastic blocks are gradually plasticized until melted, and then discharged from the hot melting device after extrusion. In the traditional technology, the screw rod of the hot melting device generally controls the residence time of the plastic blocks in the heating pipe by controlling the pitch of the screw thread, so that the plastic blocks can be fully melted. For example, the utility model patent with the patent number CN202022113532.X discloses a short fiber hot melting homogenizing screw rod, which comprises a screw rod body. A plurality of protruding blocks are arranged in the screw groove of the screw rod body. The plurality of protruding blocks are arranged in a spiral shape and spaced apart, and the pitch of the plurality of protruding blocks is equal to the pitch of the screw rod body. Each group of protruding blocks is provided with at least two and is spaced apart along the axis direction of the screw rod body. The height of the protruding block is slightly smaller than the depth of the screw groove. The length of the protruding block is one tenth to one fifth of the pitch. The protruding blocks are fixed in the screw groove by welding. By increasing the protruding blocks in the screw groove of the screw rod body, the flow speed of the melt in the screw groove can be changed, and the melt can be fully stirred and mixed. Not only the molecules of various color master batches can be uniformly mixed with the melt, but also different physical properties of raw materials, such as different intrinsic viscosities, can be uniformly mixed with each other, so as to maintain the uniformity and stability of the melt. However, in the process of blocking the melt by the protruding blocks with fixed pitch, the melt with a size larger than the pitch is easy to block the gap between the protruding blocks for a long time, which slows down the flow speed of the solution in the screw groove. At the same time, when the solution is plasticized to be smaller than the pitch, it is difficult for the protruding blocks to better block the melt, so that the melt is difficult to be completely plasticized, thereby reducing the quality of the solution. SUMMARY

[0003] Therefore, it is necessary to solve the technical problem that in the process of blocking the melt by the protruding blocks with fixed pitch, the melt with a size larger than the pitch is easy to block the gap between the protruding blocks for a long time, which slows down the flow speed of the solution in the screw groove. At the same time, when the solution is plasticized to be smaller than the pitch, it is difficult for the protruding blocks to better block the melt, so that the melt is difficult to be completely plasticized, thereby reducing the quality of the solution. It is necessary to provide a hot melting device for waste plastic recycling and reprocessing, which can effectively control the plasticizing volume of the melt and maintain the fluidity of the solution, so as to improve the plasticizing quality of the solution.

[0004] The utility model provides a kind of hot melting device for waste plastic recycling and reusing processing, including rack, machine cylinder, feed hopper, discharge pipe, screw rod and drive mechanism, the machine cylinder is installed on the rack, the feed hopper and the discharge pipe are connected with the machine cylinder, the screw rod includes mutually connected shaft body and thread group, the screw rod is rotatably installed on the machine cylinder, the drive mechanism drives the shaft body rotation, the thread group includes main outer thread and mixed thread, the main outer thread is through thread groove in helical direction, the thread groove has the feeding area for solute to flow through sequentially, mixing area and plasticizing area, the depth of the feeding area is greater than the depth of the plasticizing area, the depth of the mixing area is gradually shallow from the end of the feeding area to the starting end of the plasticizing area, the mixed thread is arranged at the mixing area, and is helically arranged along the helical direction of the mixing area, the mixed thread is spaced apart with mixing groove along its helical direction, to separate the mixed thread into multiple separation strips, the separation strip separates the thread groove into liquid flow groove and solid flow groove, wherein the depth of the thread groove refers to the distance from the main outer thread crest to the thread groove bottom, the groove width of the liquid flow groove is narrower than the groove width of the solid flow groove, the mixing groove is connected with the liquid flow groove and the solid flow groove, for molten glue to flow, the separation strip is used to block solute.

[0005] In one embodiment, the solid flow grooves of adjacent separation strips are staggered.

[0006] In one embodiment, the outer diameter of the mixed thread screw ridge is smaller than the outer diameter of the main outer thread screw ridge.

[0007] In one embodiment, each separation strip is provided with an inclined surface, which is inclined in the helical direction of the mixed thread from the groove bottom of the thread groove to the crest of the separation strip, and is inclined in the thread pitch direction of the mixed thread from the liquid flow groove to the solid flow groove.

[0008] In one embodiment, the width of the mixing groove is gradually widened from the end of the feeding area to the starting end of the plasticizing area.

[0009] In one embodiment, the thread group further includes a secondary outer thread, which is arranged at the plasticizing area, the outer diameter of the screw ridge of the secondary outer thread is smaller than the outer diameter of the main outer thread screw ridge, and the secondary outer thread is connected with the main outer thread at the starting end of the plasticizing area and at the end of the plasticizing area.

[0010] In one embodiment, the outer diameter of the screw ridge of the main outer thread is greater than the outer diameter of the screw ridge of the secondary outer thread, and the outer diameter of the screw ridge of the secondary outer thread is greater than the outer diameter of the screw ridge of the mixed thread.

[0011] In one of the embodiments, the outer diameter of the secondary outer thread gradually increases from the starting end of the mixing zone to the end of the plasticizing zone.

[0012] In one of the embodiments, the thread group further comprises an extrusion part, which is connected to the end of the primary outer thread and expands in the direction away from the shaft body in a trumpet shape, and the end of the extrusion part is arranged corresponding to the position of the discharge pipe.

[0013] In one of the embodiments, the thread group further comprises a plurality of screw fans, which are arranged at intervals around the rotation axis of the shaft body.

[0014] The waste plastic recycling and processing hot melting device provided by the application has the beneficial effects that the depth of the thread groove of the feeding zone is greater than the depth of the thread groove of the plasticizing zone, the depth of the thread groove of the mixing zone gradually decreases from the end of the feeding zone to the starting end of the plasticizing zone, the mixing thread is arranged at the mixing zone and spirally arranged along the spiral direction of the mixing zone, so as to separate the thread groove at the mixing zone into a liquid flow groove and a solid flow groove, the groove width of the liquid flow groove is narrower than the groove width of the solid flow groove, the mixing groove of the mixing thread connects the liquid flow groove and the solid flow groove, when the plastic block passes through the feeding zone and enters the mixing zone, the solid flow groove of the mixing zone is beneficial to accommodate larger solute, the solution is easy to flow through the liquid flow groove, at the same time, the solution flows between the liquid flow groove and the solid flow groove through the mixing groove, so that the heat of the solution is fully mixed with the solute, the plasticization of the solute is accelerated, and the gradually reduced solute gradually flows to the plasticizing zone along with the gradually decreasing depth of the mixing zone, thereby effectively preventing larger solute from passing through the mixing zone into the plasticizing zone, so that the solute in the mixing zone can be smoothly plasticized, and the flowability of the solution is maintained, and the plasticization quality of the solute is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of the waste plastic recycling and processing hot melting device shown in the application; Figure 2 FIG. 2 is a structural schematic diagram of the screw rod of the waste plastic recycling and processing hot melting device shown in the application; Figure 1 FIG. 3 is an enlarged schematic diagram of the A part of the screw rod shown in the application. Figure 3 Figure 2

[0016] The meanings of the reference signs in the drawings are as follows: 100, frame; 200, cylinder; 300, feeding hopper; 400, discharge pipe; ​​500, screw rod; 10, rod body; 11, coupling key; 12, first journal; 13, shaft body; 14, second journal; 20, thread group; 21, main external thread; 211, thread groove; L1, feeding zone; L2, mixing zone; L3, plasticizing zone; 22, mixing thread; 221, mixing groove; 222, partition strip; 223, liquid flow groove; 224, solid flow groove; 225, inclined surface; 23, secondary external thread; 24, extrusion part; 25, screw fan; 600, driving mechanism; 700, electric heating jacket. DETAILED DESCRIPTION

[0017] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0019] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixing" should be construed as broad terms, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0022] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0023] As shown in Figure 1 , it is a waste plastic recycling and reusing processing hot melting device shown in the present application.

[0024] As shown in Figure 1As shown, the waste plastic recycling and processing hot melting device includes: rack 100, machine barrel 200, feed hopper 300, discharge pipe 400, screw 500 and driving mechanism 600, the machine barrel 200 is installed on the rack 100, for supporting and fixing the machine barrel 200 through the rack 100, the feed hopper 300 and the discharge pipe 400 are connected with the machine barrel 200, the feed hopper 300 is used for receiving the crushed plastic block, the discharge pipe 400 outputs the completely plasticized melt, the screw 500 includes shaft body and thread group 20 connected with each other, the screw 500 is rotatably installed on the machine barrel 200, the shaft body includes sequentially arranged coupling key 11, first shaft neck 12, shaft body 13 and second shaft neck 14, the coupling key 11 is connected with the driving mechanism 600, the first shaft neck 12 and the second shaft neck 14 are rotatably installed on the machine barrel 200, the shaft body 13 is connected with the thread group 20, the driving mechanism 600 drives the shaft body to rotate, in this embodiment, the outer wall of the machine barrel 200 is covered with an electric heating jacket 700, so as to heat the machine barrel 200 through the electric heating jacket 700, so as to plasticize the melt in the machine barrel 200, the first shaft neck 12 and the second shaft neck 14 are rotatably installed on the machine barrel 200 through bearings, the driving mechanism 600 is a combination of conventional motor and speed reduction mechanism in the prior art, which will not be described here.

[0025] As Figures 2-3As shown, the thread group 20 includes a main outer thread 21 and a mixed thread 22, wherein the diameter of the main outer thread 21 is 0.8-1.1 times the diameter of the shaft body 13, the main outer thread 21 is provided with a thread groove 211 along the spiral direction, the thread groove 211 has a feeding area L1, a mixing area L2 and a plasticizing area L3 for the solution to flow through in sequence, the depth of the feeding area L1 is greater than the depth of the plasticizing area L3, the depth of the mixing area L2 gradually decreases from the end of the feeding area L1 to the starting end of the plasticizing area L3, the mixed thread 22 is arranged at the mixing area L2 and is spirally arranged along the spiral direction of the mixing area L2, the mixed thread 22 is provided with a mixing groove 221 along the spiral direction thereof, so as to separate the mixed thread 22 into a plurality of separation strips 222, the separation strips 222 separate the thread groove 211 into a liquid flow groove 223 and a solid flow groove 224, wherein the pitch of the mixed thread 22 is equal to the pitch of the main outer thread 21, the depth of the thread groove 211 refers to the distance from the top of the main outer thread 21 to the bottom of the thread groove 211, the width of the liquid flow groove 223 is narrower than the width of the solid flow groove 224, the mixing groove 221 communicates the liquid flow groove 223 and the solid flow groove 224 for the molten glue to flow, and the separation strips 222 are used to block the solution. By adopting the depth of the thread groove 211 of the feeding area L1 being greater than the depth of the thread groove 211 of the plasticizing area L3, the depth of the thread groove 211 of the mixing area L2 gradually decreasing from the end of the feeding area L1 to the starting end of the plasticizing area L3, the mixed thread 22 being arranged at the mixing area L2 and being spirally arranged along the spiral direction of the mixing area L2 so as to separate the thread groove 211 at the mixing area L2 into the liquid flow groove 223 and the solid flow groove 224, the width of the liquid flow groove 223 being narrower than the width of the solid flow groove 224, and the mixed thread 22 communicating the liquid flow groove 223 and the solid flow groove 224 through the mixing groove 221, when the plastic block passes through the feeding area L1 into the mixing area L2 along the thread groove 211, it is beneficial to accommodate larger solution through the solid flow groove 224 of the mixing area L2, the solution is easy to flow through the liquid flow groove 223, at the same time, the solution flows between the liquid flow groove 223 and the solid flow groove 224 through the mixing groove 221, so that the heat of the solution is fully mixed with the solution, the plasticization of the solution is accelerated, and the gradually reduced solution gradually flows to the plasticizing area L3 along with the gradually decreasing depth of the thread groove 211 at the mixing area L2, thereby effectively preventing larger solution from passing through the mixing area L2 into the plasticizing area L3, so that the solution in the mixing area L2 can be smoothly plasticized, achieving the purpose of controlling the smooth plasticization of the solution while maintaining the fluidity of the solution and improving the plasticization quality of the solution.

[0026] Hereinafter, the waste plastic recycling and processing hot melting device will be further described in combination with Figures 1-3 The waste plastic recycling and processing hot melting device is further described as follows.

[0027] As Figures 2-3As shown, the solid flow grooves 224 of the adjacent partition strips 222 are staggered, and when the melt flows between the partition strips 222, the staggered partition strips 222 change the flow direction of the melt, so that the melt is constantly switched to the staggered solid flow grooves 224 in the gradually narrowing process. By changing the position of the melt, the melt can effectively mix with the solution in the staggered liquid flow grooves 223 to increase the heat exchange efficiency of the melt and the solution, so as to accelerate the heat exchange efficiency of the melt and the solution in the gradually narrowing process, thereby improving the plasticizing efficiency of the melt in the solution. Further, when the melt is blocked by the partition strips 222, in order to effectively guide the melt to flow to the solid flow grooves 224, each of the partition strips 222 is provided with an inclined surface 225. The inclined surface 225 is inclined from the groove bottom of the thread groove 211 to the tooth top of the partition strip 222 in the spiral direction of the mixing thread 22, and is inclined from the liquid flow groove 223 to the solid flow groove 224 in the pitch direction of the mixing thread 22. When the melt contacts the inclined surface 225, the melt is guided by the inclined surface 225 to move towards the inner wall of the barrel 200 and the solid flow groove 224, so that the melt is closer to the inner wall of the barrel 200 to increase the plasticizing efficiency of the melt, and smoothly enters the solid flow groove 224. The melt can be more smoothly plasticized under the guidance of the staggered solid flow grooves 224, and at the same time, the solution forms a vortex into the solid flow groove 224 under the guidance of the inclined surface 225, which pushes the melt to rotate, accelerates the mixing and heat conduction of the melt and the solution in the solid flow groove 224.

[0028] Further, as shown in Figure 3 The outer diameter of the screw rib of the mixing thread 22 is smaller than the outer diameter of the screw rib of the main external thread 21. Specifically, the diameter of the mixing thread 22 is 0.6-0.9 times the diameter of the shaft body 13, so as to allow small unmelted particles to pass through the screw rib of the partition strip 222 and enter the liquid flow groove 223. When the unmelted particles pass through the screw rib of the partition strip 222, they are subjected to shearing action and are fully plasticized by mixing and heat conduction during the flow in the liquid flow groove 223. At the same time, when the melt passes through the screw rib of the partition strip 222 and enters the gradually shallower liquid flow groove 223, a vortex is formed, which produces a vortex flow along the cross section of the liquid flow groove 223, not only uniformly mixing the melt, but also making the heat exchange of the unmelted particles and the solution more sufficient, so as to improve the plasticizing smoothness of the whole melt.

[0029] As shown in Figure 2 The width of the mixing groove 221 gradually increases from the end of the feeding area L1 to the starting end of the plasticizing area L3, and the mixing groove 221 gradually widens as the depth of the mixing area L2 gradually shallows, which is beneficial to increasing the flow capacity of the solution, thereby accelerating the mixing and heat conduction of the gradually narrowing melt and the solution, and further accelerating the plasticizing efficiency of the melt.

[0030] AsFigure 2 As shown, the thread group 20 further comprises a secondary outer thread 23 arranged at the plasticizing zone L3, the outer diameter of the thread ridge of the secondary outer thread 23 is smaller than that of the main outer thread 21, and the secondary outer thread 23 is connected with the main outer thread 21 at the starting end of the plasticizing zone L3 and at the ending end of the plasticizing zone L3, wherein the diameter of the mixed thread 22 is 0.7-1 times of the diameter of the shaft body 13, specifically, the difference between the outer diameter of the thread ridge of the secondary outer thread 23 and that of the main outer thread 21 is 0.8-2.4 mm, when the melt enters the plasticizing zone L3, the thread groove 211 at the plasticizing zone L3 is separated by the secondary outer thread 23, so that the melt flows and plasticizes along the secondary outer thread 23 under the blockage of the thread ridge of the secondary outer thread 23, and the solution flows over the thread ridge of the secondary outer thread 23, thereby further separating the melt and the solution and accelerating the plasticization of the melt, and meanwhile, the flow of the solution is not disturbed.

[0031] As shown, Figure 2 the outer diameter of the thread ridge of the main outer thread 21 is larger than that of the secondary outer thread 23, and the outer diameter of the thread ridge of the secondary outer thread 23 is larger than that of the mixed thread 22, the outer diameter of the thread ridge of the mixed thread 22 is adopted to allow larger unmelted particles to mix and conduct heat between the liquid flow groove 223 and the solid flow groove 224, and the outer diameter of the thread ridge of the secondary outer thread 23 is adopted to allow smaller unmelted particles to mix and conduct heat between the thread grooves 211 separated by the secondary outer thread 23 at the plasticizing zone L3, so as to facilitate the stage control of the mixing and heat conduction of the unmelted particles and improve the mixing and heat conduction of the unmelted particles.

[0032] As shown, Figure 2 the outer diameter of the thread ridge of the secondary outer thread 23 gradually increases from the starting end of the mixing zone L2 to the ending end of the plasticizing zone L3, specifically, the difference between the outer diameter of the thread ridge of the secondary outer thread 23 and that of the main outer thread 21 gradually changes from 0.8-2.4 mm to 0.25-0.55 mm, with the gradual increase of the thread ridge of the secondary outer thread 23, the unmelted melt is blocked from flowing, and meanwhile, the flow of the solution is not disturbed, so that the melt can be completely plasticized, thereby improving the plasticizing quality of the melt.

[0033] As shown, Figure 2 the thread group 20 further comprises an extrusion part 24 connected with the ending end of the main outer thread 21 and extending in a trumpet shape away from the shaft body, the ending end of the extrusion part 24 is arranged corresponding to the position of the discharge pipe 400, the trumpet-shaped extrusion part 24 guides the solution to flow out of the screw 500 smoothly, and the solution is prevented from repeatedly plasticizing in the screw 500, thereby improving the melting efficiency of the plastic.

[0034] As Figure 2 shown, the thread group 20 also includes a plurality of screw fans 25, each of which is arranged at intervals around the rotation axis of the shaft body. The screw fans 25 facilitate the effective pushing of the solution into the discharge pipe 400. When the solution condenses and polymerizes into blocks at the interface between the discharge pipe 400 and the cylinder 200, the screw fans 25 facilitate the pushing of the blocks away from the interface between the discharge pipe 400 and the cylinder 200, thereby avoiding the blocking of the interface between the discharge pipe 400 and the cylinder 200 by the blocks and reducing the frequency of maintenance of the interface between the discharge pipe 400 and the cylinder 200, so as to improve the discharge efficiency.

[0035] As Figure 2 shown, in use, the heat melting device for recycling and processing waste plastics according to the present application is started to drive the driving mechanism 600 to control the rotation of the screw rod 500, and the electric heating jacket 700 is started to heat the cylinder 200. The crushed plastic blocks are put into the feeding hopper 300, and the plastic blocks are sequentially passed through the feeding area L1, the mixing area L2 and the plasticizing area L3 along the thread grooves 211 under the rotation of the main external thread 21. When the plastic blocks pass through the heating of the feeding area L1 and enter the mixing area L2 along the thread grooves 211, the solution produced by the plasticized plastic blocks enters the larger solid flow grooves 224, is further plasticized in the solid flow grooves 224, and flows through the liquid flow grooves 223. At the same time, the solution flows between the liquid flow grooves 223 and the solid flow grooves 224 through the mixing grooves 221, so that the heat of the solution is fully mixed with the solution to accelerate the plasticization of the solution. At the same time, the solution is guided by the inclined surfaces 225 of the staggered partition strips 222 to move between the staggered solid flow grooves 224, and the solution is easy to form vortex in the solid flow grooves 224 under the guidance of the inclined surfaces 225 to rotate and accelerate the mixing and heat conduction of the solution in the solid flow grooves 224. As the depth of the thread grooves 211 at the mixing area L2 gradually decreases, the gradually decreasing solution gradually enters the plasticizing area L3 along the gradually decreasing thread grooves 211. The solution in the plasticizing area L3 is further separated from the solution by the blocking of the secondary external thread 23. At the same time, the gradually increasing outer diameter of the screw rib of the secondary external thread 23 avoids the incompletely melted solution from passing over the screw rib of the secondary external thread 23. Finally, the completely plasticized solution is guided by the horn-shaped extrusion part 24 to push away from the cylinder 200 and enter the discharge pipe 400. At the same time, the screw fans 25 further push the solution into the discharge pipe 400 to realize the heat melting processing of the plastic blocks.

[0036] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be considered that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in contradictions.

[0037] The above embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A hot melting device for recycling waste plastics, comprising a frame, a barrel, a feeding hopper, a discharging pipe, a screw and a driving mechanism, the barrel is installed on the frame, the feeding hopper and the discharging pipe are connected with the barrel, the screw comprises a shaft body and a thread group connected with each other, the screw is rotatably installed on the barrel, and the driving mechanism drives the shaft body to rotate, characterized in that, The thread set comprises a main outer thread and a mixed thread, the main outer thread has a thread groove penetrating through in a helical direction, the thread groove has a feeding area, a mixing area and a plasticizing area for the melt to flow through in sequence, the depth of the feeding area is greater than that of the plasticizing area, the depth of the mixing area gradually decreases from the end of the feeding area to the beginning of the plasticizing area, the mixed thread is arranged at the mixing area and helically arranged along the helical direction of the mixing area, the mixed thread is spaced with a mixing groove along the helical direction thereof to separate the mixed thread into a plurality of separation strips, the separation strips separate the thread groove into a liquid flow groove and a solid flow groove, wherein the depth of the thread groove refers to the distance from the thread top of the main outer thread to the thread bottom of the thread groove, the groove width of the liquid flow groove is narrower than that of the solid flow groove, the mixing groove communicates the liquid flow groove and the solid flow groove for the melt to flow, and the separation strips are used to block the melt.

2. The hot melting device for recycling waste plastic according to claim 1, characterized in that, The solid flow grooves of adjacent separation strips are staggered.

3. The hot melting device for recycling waste plastic according to claim 1, characterized in that, The outer diameter of the screw ridge of the mixed thread is smaller than that of the main outer thread.

4. The hot melting device for recycling waste plastic according to claim 1, characterized in that, Each separation strip is provided with an inclined surface, which is inclined in the helical direction of the mixed thread from the groove bottom of the thread groove to the thread top of the separation strip, and is inclined in the thread pitch direction of the mixed thread from the liquid flow groove to the solid flow groove.

5. The hot melting device for recycling waste plastic according to claim 1, characterized in that, The width of the mixing groove gradually increases from the end of the feeding area to the beginning of the plasticizing area.

6. The hot melting device for recycling waste plastic according to claim 1, characterized in that, The thread set further comprises a secondary outer thread, the secondary outer thread is arranged at the plasticizing area, the outer diameter of the screw ridge of the secondary outer thread is smaller than that of the main outer thread, the secondary outer thread is connected to the main outer thread at the beginning of the plasticizing area, and the secondary outer thread is connected to the main outer thread at the end of the plasticizing area.

7. The hot melting device for recycling waste plastic according to claim 6, characterized in that, The outer diameter of the screw ridge of the main outer thread is greater than that of the screw ridge of the secondary outer thread, and the outer diameter of the screw ridge of the secondary outer thread is greater than that of the screw ridge of the mixed thread.

8. The hot melting device for recycling waste plastic according to claim 6, characterized in that, The outer diameter of the screw ridge of the secondary outer thread gradually increases from the beginning of the mixing area to the end of the plasticizing area.

9. The hot melt device for recycling of waste plastic according to claim 1, characterized in that, The thread set further comprises an extrusion part, the extrusion part is connected to the end of the main outer thread and expands in a horn shape away from the shaft body, and the end of the extrusion part is arranged corresponding to the position of the discharge pipe.

10. The hot melt device for recycling waste plastic according to claim 9, characterized in that, The thread set further comprises a plurality of screw fans, and each screw fan is arranged at intervals around the rotation axis of the shaft body.

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