Extruder screw charging barrel waste heat recovery device

Abstract

The invention relates to the technical field of extruders, and provides an extruder screw charging barrel waste heat recovery device which is used for recycling heat generated by a screw charging barrel and comprises a heat conduction pipe, the heat conduction pipe is wound on the screw charging barrel, and a heat exchange medium is arranged in the heat conduction pipe; the preheating barrel is used for preheating raw materials; the preheating barrel is sleeved with the preheating interlayer, a first flowing cavity is formed between the preheating interlayer and the preheating barrel, and the heat conduction pipe communicates with the first flowing cavity. By means of the technical scheme, the problems that in the prior art, a large amount of heat is generated in the machining process of an extruder screw charging barrel, but the heat is not recycled are solved.

Description

Technical Field

[0001] The invention relates to the technical field of extruders, and in particular to a waste heat recovery device for a screw barrel of an extruder. Background Art

[0002] During the operation of the extruder, the screw and barrel play a key role, which enables the material to reach a plasticized state and finally extrude and shape through operations such as material transmission, extrusion and heating. However, the screw and barrel will generate a lot of heat during processing, and this heat is often not effectively recycled.

[0003] In the traditional extruder operation mode, the heat generated by the screw barrel is mostly dissipated directly into the surrounding environment. On the one hand, this leads to a huge waste of energy and increases the production costs of enterprises. With the increasing shortage of energy resources and the continuous improvement of environmental protection requirements, this energy waste phenomenon has become increasingly irrational. On the other hand, unused heat may have an adverse effect on the ambient temperature of the production workshop, bring uncomfortable working experience to operators, and may even affect the normal operation and stability of other equipment. Summary of the invention

[0004] The present invention provides a waste heat recovery device for an extruder screw barrel, which solves the problem in the related art that a large amount of heat is generated during processing of the extruder screw barrel, but the heat is not recovered and utilized.

[0005] The technical solution of the present invention is as follows: A waste heat recovery device for an extruder screw barrel is used to recover the heat generated by the screw barrel, comprising: A heat-conducting pipe, wherein the heat-conducting pipe is wound around the screw barrel, and a heat exchange medium is provided inside the heat-conducting pipe; A preheating barrel, which is used to preheat the raw materials; A preheating interlayer is sleeved on the outside of the preheating barrel, a first flow cavity is formed between the preheating interlayer and the preheating barrel, and the heat conducting pipe is connected to the first flow cavity.

[0006] Optionally, there are a plurality of heat-conducting pipes, and the plurality of heat-conducting pipes are arranged on the screw barrel in a spaced manner and laterally wound, and the plurality of heat-conducting pipes are connected in parallel to the first flow cavity, and further comprising: A stirring shaft, the stirring shaft is rotatably disposed in the preheating barrel; A stirring blade, wherein the stirring blade is in a plurality of numbers and one end of the stirring blade is arranged on the stirring shaft.

[0007] Optionally, the preheating barrel has a first feed port and a first discharge port, the first discharge port leads to the feed port of the screw barrel, and further comprises: A partition layer is arranged in the preheating barrel to divide the interior of the preheating barrel into a first cavity and a second cavity, the first cavity is connected to the second cavity, the first feed port is connected to the first cavity, the first discharge port is connected to the second cavity, the partition layer has a second flow cavity, and the first flow cavity is connected to the second flow cavity.

[0008] Optionally, the partition layer further has a plurality of quantitative cavities, the first cavity and the second cavity are connected to each other through the quantitative cavities, the stirring blade is located in the first cavity, and one side of the stirring blade abuts against the partition layer, and further includes: A rotating baffle is rotatably disposed in the second cavity. After the rotating baffle rotates, a plurality of the quantitative cavities are closed or opened.

[0009] Optionally, the stirring shaft has a through groove, the rotating baffle has a plurality of limiting holes, and further comprises: An abutment block, one end of which is slidably arranged in the through groove, and the rotation of the stirring shaft drives the abutment block to rotate synchronously. The other end of the abutment block has a limiting protrusion, and the abutment block slides so that the limiting protrusion enters the limiting hole, so that the rotating baffle rotates synchronously with the stirring shaft.

[0010] Optionally, it also includes: A variable speed drive, the variable speed drive being arranged on the preheating barrel, the driving end of the variable speed drive being connected to the stirring shaft and being used to drive the stirring shaft to rotate, and after the stirring shaft rotates, the abutment block slides in the through groove under the action of centrifugal force; A first elastic member, wherein two ends of the first elastic member act on the abutment block and the stirring shaft respectively, and are used to provide a force for the limiting protrusion to approach the stirring shaft.

[0011] Optionally, the rotating baffle further comprises a plurality of first abutting portions, a second abutting portions and an abutting inclined surface, wherein the plurality of first abutting portions and the plurality of second abutting portions are circumferentially spaced on the rotating baffle, a plane formed by the plurality of first abutting portions is higher than a plane formed by the plurality of second abutting portions, and adjacent first abutting portions and second abutting portions are connected via the abutting inclined surface, and further comprising: An alignment push rod, one end of which is vertically slidably disposed in the second cavity. After the rotating baffle rotates, the other end of the alignment push rod is cyclically abutted with the first abutting parts, the abutting inclined surface, and the second abutting parts in sequence. After the alignment push rod abuts with the first abutting parts, the rotating baffle closes the quantitative cavity. A second elastic member, two ends of which act on the preheating barrel and the alignment push rod respectively, and are used to provide a force for the alignment push rod to approach the rotating baffle.

[0012] Optionally, it also includes: A ball bearing is rotatably arranged at one end of the alignment push rod close to the rotating baffle, and the alignment push rod is cyclically abutted with the first abutting portion, the abutting inclined surface and the second abutting portion through the ball bearing.

[0013] Optionally, it also includes: A stirring rod, wherein the stirring rod is in a plurality of numbers, one end of the stirring rod is arranged on the stirring shaft and is located in the first cavity, and after the stirring shaft rotates, the stirring rod strikes the raw material.

[0014] Optionally, the stirring blade has a material gathering portion, and the material gathering portion is used to allow the raw materials in the first cavity to quickly enter the plurality of quantitative cavities.

[0015] The working principle and beneficial effects of the present invention are: In the present invention, a large amount of heat is generated when the screw barrel is working in the extruder, and the heat is transferred to the internal heat transfer oil through the heat transfer pipe. The heated heat transfer oil flows into the first flow cavity, and then transfers the heat to the preheating barrel to preheat the raw material placed in the preheating barrel. In the plastic extrusion process, the raw material is plastic particles, which are preheated in the preheating barrel before entering the screw barrel, which can effectively increase the temperature of the raw material, making it closer to the temperature range required for processing, and reducing the energy consumption and time of the screw barrel heating the raw material.

[0016] The advantage is that the waste heat generated by the screw barrel is recovered through the heat pipe, and the heat is used to preheat the raw materials, realizing the secondary utilization of energy and significantly reducing the energy consumption of the entire extruder system.

[0017] After the raw materials are preheated, their physical properties change. For example, the plastic particles become softer after preheating and are easier to be pushed and mixed by the screw after entering the screw barrel, making the plasticization of the material in the screw barrel more uniform and improving the quality stability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the preheating barrel structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the preheating barrel of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the internal structure of the preheating barrel of the present invention from another angle; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 This is a schematic diagram of the structure of the rotating baffle of the present invention; Figure 8 It is a front view of the rotating baffle of the present invention; Fig. 9 For the present invention Figure 3 Enlarged view of point C in the middle; Fig.10 This is a schematic diagram of the internal structure of the preheating barrel of the present invention at the third angle.

[0020] In the figure: 1. screw barrel, 2. heat conduction pipe, 3. preheating barrel, 4. preheating interlayer, 301. first flow chamber, 5. stirring shaft, 6. stirring blade, 302. first feed port, 303. first discharge port, 7. partition layer, 304. first cavity, 305. second cavity, 701. second flow chamber, 702. quantitative chamber, 8. rotating baffle, 501. through groove, 801. limiting hole, 9. abutment block, 901. limiting protrusion, 10. speed change drive part, 11. first elastic part, 802. first abutment part, 803. second abutment part, 804. abutment slope, 12. alignment push rod, 13. second elastic part, 14. ball, 15. stirring rod, 601. material gathering part. DETAILED DESCRIPTION In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0021] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0022] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] Reference Figure 1 to Figure 10 , which is the first embodiment of the present invention, proposes an extruder screw barrel waste heat recovery device for recycling the heat generated by the screw barrel 1, including a heat pipe 2, which is wound around the screw barrel 1 and has a heat exchange medium inside the heat pipe 2; a preheating barrel 3 is used to preheat the raw materials; a preheating interlayer 4 is sleeved on the outside of the preheating barrel 3, a first flow cavity 301 is formed between the preheating interlayer 4 and the preheating barrel 3, and the heat pipe 2 is connected to the first flow cavity 301.

[0025] In this embodiment, in order to solve the problem in the related art that the extruder screw barrel generates a lot of heat during processing, but the heat is not recycled, a waste heat recovery device for the extruder screw barrel is designed. First, a suitable heat conducting tube 2 is selected, such as a copper tube. The heat conducting tube 2 is tightly and evenly wound around the outer surface of the screw barrel 1 to ensure that it can fully contact the heat emitted by the screw barrel 1. Heat conducting oil is injected into the heat conducting tube 2 as a heat exchange medium.

[0026] The preheating barrel 3 is made of stainless steel and has certain strength and heat preservation performance. The preheating interlayer 4 is firmly sleeved on the outside of the preheating barrel 3 by welding or other methods, so that a first flow cavity 301 is formed between the preheating interlayer 4 and the preheating barrel 3. The outlet of the heat conducting pipe 2 is connected to the first flow cavity 301, so that the heat conducting oil heated in the heat conducting pipe 2 can flow into the first flow cavity 301.

[0027] In actual operation, the screw barrel 1 generates a lot of heat when the extruder is working, and the heat is transferred to the internal heat transfer oil through the heat transfer pipe 2. The heated heat transfer oil flows into the first flow cavity 301, and then transfers the heat to the preheating barrel 3 to preheat the raw materials placed in the preheating barrel 3. In the plastic extrusion process, the raw material is plastic particles, which are preheated in the preheating barrel 3 before entering the screw barrel 1, which can effectively increase the temperature of the raw material, making it closer to the temperature range required for processing, and reducing the energy consumption and time of the screw barrel 1 to heat the raw material.

[0028] The advantage is that the waste heat generated by the screw barrel 1 is recovered through the heat pipe 2, and the heat is used to preheat the raw materials, realizing the secondary utilization of energy and significantly reducing the energy consumption of the entire extruder system. After the raw materials are preheated, their physical properties change. For example, the plastic particles become softer after preheating, and are more easily pushed and mixed by the screw after entering the screw barrel 1, making the plasticization of the materials in the screw barrel 1 more uniform, and improving the quality stability of the product.

[0029] Furthermore, there are a number of heat-conducting tubes 2, which are laterally wound and arranged on the screw barrel 1 at intervals, and the heat-conducting tubes 2 are connected in parallel to the first flow chamber 301, and also include a stirring shaft 5, which is rotatably arranged in the preheating barrel 3; there are a number of stirring blades 6, and one end of the stirring blades 6 is arranged on the stirring shaft 5.

[0030] In this embodiment, a plurality of heat conducting tubes 2 are uniformly wound on the screw barrel 1 at a specific interval to ensure that the heat emitted by the screw barrel 1 is absorbed to the maximum extent. One end of each heat conducting tube 2 is connected in parallel to the first flow cavity 301 through a connecting component such as a tee pipe fitting to ensure uniform distribution and circulation of the heat exchange medium in each heat conducting tube 2. At the same time, a plurality of heat conducting tubes 2 are connected in parallel, so that it is possible to independently control whether each heat conducting tube 2 circulates the heat exchange medium. An independent solenoid valve is provided on each heat conducting tube 2. When the local temperature is too low and heat collection cannot be performed, the flow of the heat exchange medium in the heat conducting tube 2 in the area is stopped.

[0031] For the stirring shaft 5, a bearing seat is installed at the top center of the preheating barrel 3, and the stirring shaft 5 passes through the bearing seat and can rotate freely inside the bearing seat. A plurality of stirring blades 6 are evenly installed on the stirring shaft 5.

[0032] When the screw barrel 1 starts working and generates heat, the heat is transferred to the internal heat exchange medium through the heat conducting pipe 2, and the heat exchange medium is heated and flows into the first flow cavity 301 of the preheating interlayer 4. At the same time, the driving device of the stirring shaft 5 is started to drive the stirring shaft 5 to rotate, and the stirring shaft 5 then drives the stirring blades 6 to rotate in the preheating barrel 3. During the preheating process of the plastic raw material, after the granular raw material enters the preheating barrel 3 from the first feed port 302, the stirring blades 6 continuously stir the raw material, so that the raw material is fully mixed and tumbled in the preheating barrel 3, ensuring that the raw material can evenly receive the heat transferred from the preheating interlayer 4, thereby achieving efficient preheating.

[0033] Furthermore, the preheating barrel 3 has a first feed port 302 and a first discharge port 303, the first discharge port 303 leads to the feed port of the screw barrel 1, and also includes a partition layer 7, the partition layer 7 is arranged in the preheating barrel 3, and the interior of the preheating barrel 3 is divided into a first cavity 304 and a second cavity 305, the first cavity 304 is connected to the second cavity 305, the first feed port 302 is connected to the first cavity 304, the first discharge port 303 is connected to the second cavity 305, the partition layer 7 has a second flow cavity 701, and the first flow cavity 301 is connected to the second flow cavity 701.

[0034] In this embodiment, the partition layer 7 is installed inside the preheating barrel 3 by welding, and the inside of the preheating barrel 3 is divided into a first cavity 304 and a second cavity 305. The first feed port 302 is arranged at the top of the preheating barrel 3 near the first cavity 304, which is convenient for the input of raw materials. The first discharge port 303 is located at the bottom of the second cavity 305 and above the feed port of the extruder. The second flow cavity 701 constructed inside the partition layer 7 is connected to the first flow cavity 301 through a passage, and a circulation pump is installed between the heat pipe 2 and the first flow cavity to ensure that the heat exchange medium circulates stably between the heat pipe 2, the first flow cavity 301 and the second flow cavity 701.

[0035] The raw material particles enter the first cavity 304 from the first feed port 302. At this time, the heat generated by the screw barrel 1 is transferred to the first flow cavity 301 through the heat pipe 2, and then flows into the second flow cavity 701 under the action of the circulation pump. The heat preheats the raw material particles in the first cavity 304 through the partition layer 7. As the stirring shaft 5 rotates, the raw material particles continue to roll in the first cavity 304 and gradually fall into the second cavity 305. After further mixing and homogenizing the temperature in the second cavity 305, they enter the extruder through the first discharge port 303 for subsequent processing.

[0036] The advantage is that the second flow chamber 701 increases the heat exchange contact area. The heat exchange medium circulates between the first flow chamber 301 and the second flow chamber 701, heating the raw material from multiple directions, reducing heat loss and local overheating.

[0037] Furthermore, the partition layer 7 also has a plurality of quantitative cavities 702, the first cavity 304 and the second cavity 305 are interconnected through the quantitative cavities 702, the stirring blade 6 is located in the first cavity 304, and one side of the stirring blade 6 is abutted against the partition layer 7, and also includes a rotating baffle 8, which is rotatably arranged in the second cavity 305. After the rotating baffle 8 rotates, the plurality of quantitative cavities 702 are closed or opened.

[0038] Furthermore, the stirring shaft 5 has a through groove 501, the rotating baffle 8 has a plurality of limiting holes 801, and also includes an abutment block 9, one end of which is slidably arranged in the through groove 501, and the rotation of the stirring shaft 5 drives the abutment block 9 to rotate synchronously, and the other end of the abutment block 9 has a limiting protrusion 901, and the abutment block 9 slides so that the limiting protrusion 901 enters the limiting hole 801, so that the rotating baffle 8 and the stirring shaft 5 rotate synchronously.

[0039] Furthermore, it also includes a speed-changing drive component 10, which is arranged on the preheating barrel 3. The driving end of the speed-changing drive component 10 is connected to the stirring shaft 5, and is used to drive the stirring shaft 5 to rotate. After the stirring shaft rotates, under the action of centrifugal force, the abutment block slides in the through groove; the two ends of the first elastic component 11 act on the abutment block 9 and the stirring shaft 5 respectively, and are used to provide a force for the limiting protrusion 901 to approach the stirring shaft 5.

[0040] In this embodiment, the quantitative cavity 702 on the partition layer 7 is evenly distributed on the partition layer 7 in an annular shape. The edge side wall of the rotating baffle 8 is connected to the inner wall of the second cavity 305, so that the rotating baffle 8 can rotate flexibly in the second cavity 305. One side of the stirring blade 6 abuts against the partition layer 7 to ensure that the raw material can be effectively pushed to the quantitative cavity 702. The radial through groove 501 is processed inside the stirring shaft 5 to ensure that one end of the abutment block 9 slides smoothly. The limiting protrusion 901 at the other end of the abutment block 9 accurately matches the limiting hole 801. Initially, the raw material particles continue to enter the first cavity 304 from the first feed port 302 and accumulate on the partition layer 7. The stirring shaft 5 rotates slowly at a low speed under the drive of the variable speed drive 10, such as a programmable speed regulating motor, and the stirring blade 6 gently turns the raw material, so that the raw material accumulated on the partition layer 7 gradually falls into the quantitative cavity 702. When the quantitative cavity 702 is filled with raw materials, the speed regulating motor quickly increases the speed, and the speed of the stirring shaft 5 is accelerated. At this time, the abutment block 9 overcomes the pulling force of the first elastic member 11 such as a tension spring and slides outward under the action of centrifugal force, and the limiting protrusion 901 is accurately inserted into the limiting hole 801 of the rotating baffle 8. As the stirring shaft 5 continues to rotate, the rotating baffle 8 rotates synchronously, the quantitative cavity 702 is opened, and the raw materials therein smoothly fall into the second cavity 305, and then enter the extruder feed port.

[0041] The advantage is that the amount of raw material entering the extruder can be precisely controlled by controlling the cooperation between the abutment block 9 and the limit hole 801 through the change in the rotation speed of the stirring shaft 5. The risk of blockage caused by a large amount of raw material rushing into the extruder at one time is avoided. At the same time, quantitative feeding ensures that the raw material is heated evenly in the extruder, prevents local overheating or overcooling due to material accumulation, and ensures the stability of product quality.

[0042] Furthermore, the rotating baffle 8 also has a plurality of first abutting portions 802, a second abutting portion 803 and an abutting inclined surface 804. The plurality of first abutting portions 802 and the plurality of second abutting portions 803 are circumferentially spaced apart on the rotating baffle 8. The plane formed by the plurality of first abutting portions 802 is higher than the plane formed by the plurality of second abutting portions 803. The adjacent first abutting portions 802 and the second abutting portions 803 are connected by the abutting inclined surface 804. The rotating baffle 8 also includes a positioning push rod 12. The positioning push rod 12 is One end of the rod 12 is vertically slidably set in the second cavity 305. After the rotating baffle 8 rotates, the other end of the alignment push rod 12 cyclically abuts against a plurality of first abutting portions 802, abutting inclined surfaces 804, and second abutting portions 803 in sequence. After the alignment push rod 12 abuts against the first abutting portion 802, the rotating baffle 8 closes the quantitative cavity 702; the two ends of the second elastic member 13 act on the preheating barrel 3 and the alignment push rod 12 respectively, so as to provide a force for the alignment push rod 12 to approach the rotating baffle 8.

[0043] Furthermore, it also includes a ball 14, which is rotatably arranged at one end of the alignment push rod 12 close to the rotating baffle 8. The alignment push rod 12 cyclically abuts against the first abutting portion 802, the abutting inclined surface 804 and the second abutting portion 803 through the ball 14.

[0044] In this embodiment, the quantitative cavity 702, the first abutment portion 702 and the second abutment portion 803 are the same in number, the first abutment portion 802 and the second abutment portion 803 of the rotating baffle 8 are alternately distributed in an annular manner, and the first abutment portion 802 and the second abutment portion 803 are connected by an abutment inclined surface 804. The inner wall of the second cavity 305 has a guide groove. One end of the alignment push rod 12 is vertically installed in the guide groove of the inner wall of the second cavity 305 through a linear bearing to ensure accurate and stable vertical sliding. The surface of the ball 14 is ultra-smoothly processed and is rotatably arranged at the end of the alignment push rod 12 so that it can rotate freely.

[0045] When the device is running, the rotating baffle 8 closes the quantitative cavity 702 in the initial state, and the raw material enters the first cavity 304 and accumulates in the partition layer 7. The stirring shaft 5 rotates at a low speed to fill the quantitative cavity 702 with raw materials. When the quantitative cavity 702 is full, the stirring shaft 5 accelerates, and the abutment block 9 cooperates with the limit hole 801 to drive the rotating baffle 8 to rotate and open the quantitative cavity 702, and the raw material falls into the second cavity 305. After the quantitative cavity 702 is opened, the rotation speed of the stirring shaft 5 decreases, the abutment block 9 is separated from the limit hole 801, and the rotating baffle 8 may not completely close the quantitative cavity 702. At this time, the second elastic member 13, such as a compression spring, pushes the alignment push rod 12 to move upward, and the ball 14 contacts the abutment inclined surface 804 of the rotating baffle 8. Since the ball 14 is rotatable, under the continuous force of the second elastic member 13, the ball 14 rolls along the abutment inclined surface 804 and pushes the rotating baffle 8 to rotate until the rotating baffle 8 completely closes the quantitative cavity 702 to prevent the raw material from leaking.

[0046] Furthermore, it also includes a stirring rod 15, which is in a plurality of numbers. One end of the stirring rod 15 is arranged on the stirring shaft 5 and is located in the first cavity 304. After the stirring shaft 5 rotates, the stirring rod 15 strikes the raw material.

[0047] In this embodiment, one end of the stirring rod 15 is firmly fixed to the stirring shaft 5 by welding or threaded connection. The number of stirring rods 15 is reasonably designed according to the size of the preheating barrel 3 and the characteristics of the raw material. The stirring rods 15 are distributed in a spiral shape in the first cavity 304, and the length extends to a position close to the partition layer 7, but does not contact the partition layer 7, so as to ensure that the stirring rods 15 can fully contact the raw material when the stirring shaft 5 rotates.

[0048] During the preheating process, after the raw materials enter the first cavity 304 from the first feed port 302, the stirring shaft 5 starts to rotate under the drive of a driving device such as a motor, and the stirring rod 15 also performs a circular motion. Since the stirring rod 15 is distributed in a spiral shape, it will knock the falling raw materials from different angles during the rotation process. When the lumps of raw materials enter the preheating barrel 3, the stirring rod 15 can effectively break up these lumps. Keeping the raw materials in a loose state at all times ensures that each raw material can fully exchange heat with the wall of the preheating barrel 3 and the surrounding heated raw materials to achieve uniform preheating.

[0049] Furthermore, the stirring blade 6 has a material gathering portion 601 , and the material gathering portion 601 is used to allow the raw materials in the first cavity 304 to quickly enter the plurality of quantitative cavities 702 .

[0050] In this embodiment, the material gathering portion 601 of the stirring blade 6 is located in the middle of the stirring blade 6 and has an inwardly concave structure. When the raw material enters the first cavity 304 of the preheating barrel 3 from the first feed port 302. The stirring shaft 5 starts to rotate, and the stirring blade 6 rotates accordingly. Due to the special shape of the material gathering portion 601, during the rotation of the stirring blade 6, the raw material will flow along the edge of the stirring blade 6 and gather at the material gathering portion 601. Under the push of the stirring blade 6, these raw materials fall into the quantitative cavity 702 on the partition layer 7 more efficiently and quickly.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A waste heat recovery device for an extruder screw barrel, used for recovering the heat generated by the screw barrel (1), characterized in that: include: A heat conduction pipe (2), the heat conduction pipe (2) being wound around the screw barrel (1), and having a heat exchange medium inside the heat conduction pipe (2); A preheating barrel (3), wherein the preheating barrel (3) is used to preheat the raw materials; A preheating interlayer (4), the preheating interlayer (4) being sleeved on the outside of the preheating barrel (3), a first flow cavity (301) being formed between the preheating interlayer (4) and the preheating barrel (3), and the heat conducting pipe (2) being connected to the first flow cavity (301).

2. The extruder screw barrel waste heat recovery device according to claim 1, characterized in that: The heat conducting tubes (2) are in a plurality, and the plurality of heat conducting tubes (2) are arranged on the screw barrel (1) in a spaced manner and laterally wound, and the plurality of heat conducting tubes (2) are connected in parallel to the first flow chamber (301), and further comprising: a stirring shaft (5), the stirring shaft (5) being rotatably disposed in the preheating barrel (3); A stirring blade (6), wherein the stirring blade (6) is provided in a plurality of numbers, and one end of the stirring blade (6) is arranged on the stirring shaft (5).

3. The extruder screw barrel waste heat recovery device according to claim 2, characterized in that: The preheating barrel (3) has a first feed port (302) and a first discharge port (303), wherein the first discharge port (303) leads to the feed port of the screw barrel (1), and further comprises: A partition layer (7), wherein the partition layer (7) is arranged in the preheating barrel (3), and divides the interior of the preheating barrel (3) into a first cavity (304) and a second cavity (305), wherein the first cavity (304) is connected to the second cavity (305), the first feed port (302) is connected to the first cavity (304), and the first discharge port (303) is connected to the second cavity (305), and the partition layer (7) has a second flow cavity (701), and the first flow cavity (301) is connected to the second flow cavity (701).

4. The extruder screw barrel waste heat recovery device according to claim 3, characterized in that: The partition layer (7) further comprises a plurality of quantitative cavities (702), the first cavity (304) and the second cavity (305) are connected to each other through the quantitative cavities (702), the stirring blade (6) is located in the first cavity (304), and one side of the stirring blade (6) is in contact with the partition layer (7), and further comprises: A rotating baffle (8), wherein the rotating baffle (8) is rotatably disposed in the second cavity (305), and after the rotating baffle (8) rotates, a plurality of the quantitative cavities (702) are closed or opened.

5. The extruder screw barrel waste heat recovery device according to claim 4, characterized in that: The stirring shaft (5) has a through groove (501), the rotating baffle (8) has a plurality of limiting holes (801), and further comprises: An abutment block (9), one end of which is slidably disposed in the through groove (501), and the agitator shaft (5) rotates to drive the abutment block (9) to rotate synchronously, and the other end of the abutment block (9) has a limiting protrusion (901), and the abutment block (9) slides so that the limiting protrusion (901) enters the limiting hole (801), so that the rotating baffle (8) and the agitator shaft (5) rotate synchronously.

6. The extruder screw barrel waste heat recovery device according to claim 5, characterized in that: Also includes: a variable speed drive member (10), the variable speed drive member (10) being arranged on the preheating barrel (3), the driving end of the variable speed drive member (10) being connected to the stirring shaft (5) and being used for driving the stirring shaft (5) to rotate, and after the stirring shaft rotates, the abutment block slides in the through groove under the action of centrifugal force; A first elastic member (11), wherein two ends of the first elastic member (11) act on the abutment block (9) and the stirring shaft (5) respectively, and are used to provide a force for the limiting protrusion (901) to approach the stirring shaft (5).

7. The extruder screw barrel waste heat recovery device according to claim 5, characterized in that: The rotating baffle (8) further comprises a plurality of first abutting portions (802), a second abutting portions (803) and an abutting inclined surface (804); the plurality of first abutting portions (802) and the plurality of second abutting portions (803) are circumferentially spaced apart on the rotating baffle (8); a plane formed by the plurality of first abutting portions (802) is higher than a plane formed by the plurality of second abutting portions (803); adjacent first abutting portions (802) and second abutting portions (803) are connected via the abutting inclined surface (804); and further comprises: an alignment push rod (12), one end of which is vertically slidably disposed in the second cavity (305); after the rotating baffle (8) rotates, the other end of the alignment push rod (12) cyclically abuts against a plurality of the first abutting portions (802), the abutting inclined surfaces (804), and the second abutting portions (803) in sequence; after the alignment push rod (12) abuts against the first abutting portions (802), the rotating baffle (8) closes the quantitative cavity (702); A second elastic member (13), two ends of the second elastic member (13) acting on the preheating barrel (3) and the alignment push rod (12) respectively, for providing a force for the alignment push rod (12) to approach the rotating baffle (8).

8. The extruder screw barrel waste heat recovery device according to claim 7, characterized in that: Also includes: A ball (14), wherein the ball (14) is rotatably arranged at one end of the alignment push rod (12) close to the rotating baffle (8), and the alignment push rod (12) cyclically abuts against the first abutment portion (802), the abutment inclined surface (804), and the second abutment portion (803) through the ball (14).

9. The extruder screw barrel waste heat recovery device according to claim 4, characterized in that: Also includes: A stirring rod (15), wherein the stirring rod (15) is provided in a plurality of numbers, one end of the stirring rod (15) is arranged on the stirring shaft (5) and is located in the first cavity (304); after the stirring shaft (5) rotates, the stirring rod (15) strikes the raw material.

10. The extruder screw barrel waste heat recovery device according to claim 4, characterized in that: The stirring blade (6) has a material gathering portion (601), and the material gathering portion (601) is used to allow the raw materials in the first cavity (304) to quickly enter the plurality of quantitative cavities (702).

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