Heating furnace of waste plastic regeneration extruder

Abstract

The invention provides a heating furnace of a waste plastic regeneration extruder, and relates to plastic recovery. The heating furnace of the waste plastic regeneration extruder comprises a screw extruder, the inlet end of the screw extruder is connected with and penetrates through a heating sleeve, and the heating sleeve is divided into a hot air heating unit at the upper end and a hot melting unit at the lower end. According to the heating furnace of the waste plastic regeneration extruder, hot air is used for firstly heating plastic, the plastic is layered and fully heated in the bearing cage, and a pressing rod is pressed to drive an elastic pore plate to swing before the plastic is softened, so that a gap is formed between the elastic pore plate and a ferrule; plastic fragments fall into the material sliding ring from the gap and are discharged to the position above the supporting plate through the through hole, the plastic fragments can be stirred and hot-melted through revolution of the heating rod, the plastic fragments are hot-melted into fluid, the fluid can be extruded into the screw extruder under the action of the pressing plate, and the problem that in the prior art, the melting speed of the plastic fragments is low is solved.

Description

Technical Field

[0001] The present invention relates to plastic recycling, specifically to a heating furnace for a waste plastic recycling extrusion machine. Background Art

[0002] Plastic recycling refers to adopting a certain recycling process to recycle waste plastics and realize the purpose of turning waste into treasure. Currently, the waste plastics in China mainly include plastic films, plastic filaments and woven products, foam plastics, plastic packaging boxes and containers, daily-use plastic products, plastic bags, and agricultural mulch films, etc.

[0003] The existing patent CN108515638B discloses a method for recycling and reusing waste plastics. The method includes the following steps: S1, putting the waste plastics into a water tank for cleaning; S2, drying the waste plastics cleaned in S1; S3, putting the dried waste plastics in S2 into a crusher for crushing; S4, putting the crushed waste plastics in S3 into a melting furnace for melting; S5, filtering out impurities from the melted waste plastics in S4 through a filter screen; S6, cooling the filtered waste plastics in S5 for later use. In this method, the crusher adopted can quickly crush and cut solid plastics through a crushing mechanism. The crushing nails with a conical structure can improve the crushing effect and increase the cutting method. Through the setting of the brush, the plastic particles can be quickly swept to the blanking mechanism, improving the blanking speed. In this technical solution, it is disclosed that new plastic particles are formed by mixing and granulating after melting the hot melt plastics for later processing.

[0004] The existing patent CN219618252U discloses a plastic hot melt machine, including a hot melt barrel and a stirring unit; Hot melt barrel: A heat transfer plate is arranged in a groove at the lower end of its inner cavity, and heating wires are evenly distributed between the heat transfer plate and the groove arranged at the lower end of the inner cavity of the hot melt barrel; Stirring unit: including a motor and a stirring frame I, the motor is arranged in the middle of the upper end face of the hot melt barrel through a mounting seat, and the lower end of the output shaft of the motor passes through a through hole arranged in the middle of the top wall surface of the hot melt barrel and a stirring frame I is arranged at the end; Among them: It also includes a control switch, and the control switch is arranged on the outer arc surface of the hot melt barrel.

[0005] This plastic hot melt machine can stir the plastic melt and the upper end of the plastics that are not hot melted in time, ensuring the full and thorough hot melting of the plastics, achieving the purpose of cleaning the inner wall of the plastic hot melt machine while stirring the plastic raw materials, and avoiding the problem that the melted plastic material adheres to the inner wall of the plastic hot melt machine and affects the next use. However, in this technical solution, the plastic melting depends on the contact between the plastic and the heating unit, and the uniformity of contact is increased by flipping. However, there are numerous plastic particles, and only relying on thermal contact to melt the plastic particles has a small contact area and low melting efficiency. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a heating furnace for a waste plastic recycling extruder, which solves the problems raised in the above background art.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A heating furnace for a waste plastic recycling extruder, including a screw extruder, the inlet end of the screw extruder is connected and penetrated with a heating sleeve, the heating sleeve is divided into a hot air heating unit at the upper end and a hot melt unit at the lower end, the heating sleeve includes a housing, the bottom end of the housing is provided with a bottom cover connected to the housing, the bottom cover is connected to and penetrated with the screw extruder, the hot melt unit includes a support plate, a conductive groove is opened at the bottom end of the support plate, a conductive slip ring is fixedly installed on the upper surface of the bottom cover, a heating rod connected to the conductive slip ring is fixedly installed on the upper surface of the support plate, a power source for driving the support plate to rotate is arranged on one side of the housing, a filter plate connected to and penetrated with the screw extruder is embedded in the middle of the support plate, an installation plate is fixedly installed above the heating rod inside the housing, a pressing plate is arranged below the installation plate, the pressing plate and the installation plate are fixedly connected through a telescopic sleeve ring, through holes coinciding with the heating rods are opened on the surface of the pressing plate, a notch groove communicated with the through holes is opened on the surface of the installation plate, a material chute ring communicated with the through holes is fixedly installed below the notch groove, through hole groups are opened above the installation plate on the housing, a heat preservation sleeve covering the through hole groups is fixedly installed on the outer surface of the housing, an air return unit is connected and penetrated with one side of the heat preservation sleeve, heating wires are arranged inside the heat preservation sleeve, a cover plate is arranged at the top end of the housing, a bearing cage is arranged above the installation plate at the bottom end of the cover plate, a return air hole is opened at the top end of the cover plate, a wind gathering cover covering the return air hole is fixedly installed on the cover plate, the wind gathering cover is connected and penetrated with the air return unit, symmetric elastic orifice plates are elastically hinged at the bottom end inside the bearing cage, a pressing rod for pressing the elastic orifice plates is slidably connected in the middle of the bearing cage, the pressing rod extends above the cover plate and is slidably connected with the cover plate.

[0008] Preferably, sealing rings are respectively opened on the upper surface and the lower surface of the support plate, the upper and lower two sealing rings are arranged in a staggered manner, and sealing rings sleeved in the sealing rings are arranged on both the bottom cover and the housing.

[0009] Preferably, the heating rods are divided into inner and outer two circles, the number of each circle is multiple, the included angle between each circle of heating rods is the same, the material chute ring is aligned with the through holes of the outer circle, convex rings are arranged on the inner side and the outer side of the through holes of the outer circle for the pressing plate, and the material chute ring is sleeved on the outer surface of the convex rings.

[0010] Preferably, the height of the heating rods in the inner circle is longer than the length of the heating rods in the outer circle, the heating rods in the inner circle are always sleeved inside the through holes, the heating rods in the outer circle are separated from the pressing plate when the pressing plate is at the highest point, a rotating block is fixedly installed at the free end of the telescopic sleeve ring, and a clamping ring sleeved on the outer surface of the rotating block is fixedly installed at the top end of the pressing plate.

[0011] Preferably, a connecting rod is fixedly installed in the middle of the carrying cage. Fixing plates are fixedly installed at equal intervals on the outer surface of the connecting rod. Elastic orifice plates are elastically hinged on both sides of the fixing plates. A notch is formed on one side of the elastic orifice plate away from the fixing plate. A pressure rod is sleeved inside the notch. A pressure beam is fixedly installed above the notch on the pressure rod. The tops of two symmetrical pressure rods are fixedly connected by a cross beam, and the cross beam is located above the cover plate.

[0012] Preferably, the carrying cage includes a ring with openings on the outer circle. The top of the ring is threadedly connected to the cover plate. A covering part that can be pulled outwards is arranged on the side wall of the ring. The covering part is semi-circular, and the length of the covering part is greater than the distance between the uppermost elastic orifice plate and the lowermost elastic orifice plate.

[0013] Preferably, a groove is arranged at the bottom end of the outer shell. A protrusion sleeved in the groove is arranged on the upper surface of the bottom cover. The bottom cover and the outer shell are fixedly connected by screws. The cover plate and the outer shell are fixedly connected by screws.

[0014] Preferably, the support plate is circular, teeth are arranged on the edge of the support plate, and a gear meshing with the teeth is arranged at the output end of the power source.

[0015] Compared with the prior art, the present invention has the following beneficial effects: For the heating furnace of the waste plastic recycling extruder, hot air is first used to heat the plastic, the plastic is heated layer by layer in the carrying cage sufficiently, and before the plastic softens, the elastic orifice plate is driven to swing by pressing the pressure rod, so that a gap can be formed between the elastic orifice plate and the ring. Plastic fragments fall into the material chute ring from the gap and are discharged above the support plate through the through hole. By the revolution of the heating rod, the plastic fragments can be stirred and melted, so that the plastic fragments can be melted into a fluid, and under the action of the pressing plate, they can be extruded into the screw extruder, solving the problem of slow melting speed of plastic fragments in the prior art.

[0016] For the heating furnace of the waste plastic recycling extruder, the height of the heating rods on the inner circle is longer than that of the heating rods on the outer circle. The heating rods on the inner circle are always sleeved inside the through hole. The heating rods on the outer circle are separated from the pressing plate at the highest point of the pressing plate. A rotating block is fixedly installed at the free end of the telescopic ring. A clamping ring sleeved on the outer surface of the rotating block is fixedly installed at the top end of the pressing plate. Through such a setting, the heating rod can drive the pressing plate to rotate together, and at the same time, a space can be reserved for plastic to enter above the support plate.

[0017] For the heating furnace of the waste plastic recycling extruder, a connecting rod is fixedly installed in the middle of the bearing cage. Fixed plates are equidistantly fixedly installed on the outer surface of the connecting rod. Elastic orifice plates are elastically hinged on both sides of the fixed plates. A notch is formed on the side of the elastic orifice plate away from the fixed plate. A pressure rod is sleeved inside the notch. A pressure beam is fixedly installed above the notch on the pressure rod. The tops of two symmetric pressure rods are fixedly connected by a cross beam. The cross beam is located above the cover plate. Through such a setting, plastics can be evenly laid in multiple layers, thereby increasing the contact area with hot air and further improving the efficiency of plastic softening.

[0018] For the heating furnace of the waste plastic recycling extruder, a covering part that can be pulled outwards is arranged on the side wall of the ferrule. The covering part is semi-circular. The length of the covering part is greater than the distance between the uppermost elastic orifice plate and the lowermost elastic orifice plate. Through such a setting, it can be used for putting plastics into the bearing cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a semi-sectional schematic diagram of the heating sleeve of the present invention; Figure 3 is a schematic diagram of the bottom cover of the present invention; Figure 4 is a schematic diagram of the connection of the support plate of the present invention; Figure 5 is a schematic diagram of the connection of the pressing plate of the present invention; Figure 6 is a semi-sectional schematic diagram of the outer shell of the present invention; Figure 7 is a semi-sectional schematic diagram of the bearing cage of the present invention; Figure 8 is a schematic diagram of the connection of the elastic orifice plate of the present invention; Figure 9 is a semi-sectional schematic diagram of the ferrule of the present invention.

[0020] In the figure: 1. Screw extruder; 2. Heating sleeve; 3. Hot air heating unit; 4. Hot melt unit; 201. Outer shell; 202. Bottom cover; 203. Sealing ring; 204. Sealing gasket; 401. Support plate; 402. Conductive groove; 403. Heating rod; 404. Power source; 405. Mounting plate; 406. Pressing plate; 407. Through hole; 408. Notch groove; 409. Material chute ring; 410. Filter plate; 411. Convex ring; 412. Rotating block; 413. Snap ring; 414. Groove; 415. Protrusion; 416. Tooth; 417. Conductive slip ring; 418. Telescopic sleeve; 301. Through hole group; 302. Heat preservation sleeve; 303. Return air unit; 304. Heating wire; 305. Cover plate; 306. Carrying cage; 307. Return air hole; 308. Air collecting hood; 309. Elastic orifice plate; 310. Pressing rod; 311. Connecting rod; 312. Fixed plate; 313. Notch; 314. Pressing beam; 315. Cross beam; 316. Ferrule; 317. Covering part. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0022] It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative position relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0023] In the present application, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0024] In addition, in this application, descriptions such as "first" and "second" are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] For example Figures 1-9As shown in the figure, the heating furnace of the waste plastic recycling extruder includes a screw extruder 1, which can be a single-screw extruder or a twin-screw extruder. A heating and insulation layer is provided on the barrel wall. The inlet end of the screw extruder 1 is connected and penetrated with a heating sleeve 2. The treated waste plastic is placed in the heating sleeve 2 for melting. The heating sleeve 2 is divided into a hot air heating unit 3 at the upper end and a melting unit 4 at the lower end. The waste plastic is softened in the hot air heating unit 3 and melted in the melting unit 4. The heating sleeve 2 includes an outer shell 201. A bottom cover 202 connected to the outer shell 201 is provided at the bottom end of the outer shell 201. The bottom cover 202 is connected and penetrated with the screw extruder 1. The melting unit 4 includes a support plate 401. A conductive groove 402 is opened at the bottom end of the support plate 401. A conductive slip ring 417 is fixedly installed on the upper surface of the bottom cover 202. A heating rod 403 connected to the conductive slip ring 417 is fixedly installed on the upper surface of the support plate 401. A power source 404 for driving the support plate 401 to rotate is provided on one side of the outer shell 201. By rotating the power source 404, the support plate 401 can be driven to rotate, and then the heating rod 403 can be driven to revolve, so that the position of the plastic can be moved, and then the plastic can be stirred and heated. A filter plate 410 connected and penetrated with the screw extruder 1 is embedded in the middle of the support plate 401. The setting of the filter plate 410 can prevent unmolten plastic particles from flowing out through the through holes covering the filter plate 410, and avoid that some plastics cannot be melted. An installation plate 405 is fixedly installed inside the outer shell 201 above the heating rod 403. A pressing plate 406 is provided below the installation plate 405. The pressing plate 406 and the installation plate 405 are fixedly connected by a telescopic sleeve 418. Through holes 407 coinciding with the heating rod 403 are opened on the surface of the pressing plate 406. By the operation of the telescopic sleeve 418, the pressing plate 406 can be driven to descend, so that the molten plastic can be extruded through the filter plate 410 and injected into the screw extruder 1. A notch groove 408 communicating with the through hole 407 is opened on the surface of the installation plate 405. A material chute ring 409 communicating with the through hole 407 is fixedly installed below the notch groove 408. Through such a setting, the softened plastic can be discharged into the upper part of the support plate 401 through the through hole 407. Through holes 301 are opened in the outer shell 201 above the installation plate 405. A heat preservation sleeve 302 covering the through holes 301 is fixedly installed on the outer surface of the outer shell 201. An air return unit 303 is connected and penetrated on one side of the heat preservation sleeve 302. The air return unit 303 includes a fan and a pipeline. The pipeline is connected to the heat preservation sleeve 302. Heating wires 304 are arranged inside the heat preservation sleeve 302. The air circulated by the air return unit 303 is heated by the heating wires 304 for softening the plastic. A cover plate 305 is provided at the top end of the outer shell 201. A bearing cage 306 is provided below the bottom end of the cover plate 305 above the installation plate 405. An air return hole 307 is opened at the top end of the cover plate 305. A wind collecting cover 308 covering the air return hole 307 is fixedly installed on the cover plate 305.The air collecting hood 308 is connected and communicated with the air return unit 303. Symmetrical elastic orifice plates 309 are elastically hinged at the inner bottom end of the carrying cage 306. A pressure rod 310 for pressing the elastic orifice plate 309 is slidably connected to the middle of the carrying cage 306. The pressure rod 310 extends above the cover plate 305 and is slidably connected to the cover plate 305. When the pressure rod 310 squeezes the elastic orifice plate 309, the plastic in the carrying cage 306 can be discharged from the gap.,

[0026] Sealing rings 203 are respectively arranged on the upper surface and the lower surface of the support plate 401. Through such a setting, molten plastic leakage can be avoided. The bottom cover 202 and the outer shell 201 are both provided with sealing rings 204 sleeved in the sealing rings 203. The upper and lower two sealing rings 203 are arranged in a staggered manner, which can reduce the stress concentration of the support plate 401.

[0027] The heating rods 403 are divided into two inner and outer circles, and the number of each circle is multiple. The included angles between the heating rods 403 in each circle are the same. The material chute ring 409 is aligned with the through holes 407 in the outer circle. Convex rings 411 are arranged on the inner side and the outer side of the through holes 407 in the outer circle of the pressing plate 406. The material chute ring 409 is sleeved on the outer surface of the convex rings 411. Through such a setting, the plastic above the support plate 401 can be fully heated.

[0028] The height of the heating rods 403 in the inner circle is longer than the length of the heating rods 403 in the outer circle. The heating rods 403 in the inner circle are always sleeved inside the through holes 407. The heating rods 403 in the outer circle are separated from the pressing plate 406 at the highest point of the pressing plate 406. A rotating block 412 is fixedly installed at the free end of the telescopic sleeve 316. A snap ring 413 sleeved on the outer surface of the rotating block 412 is fixedly installed at the top end of the pressing plate 406. Through such a setting, the heating rods 403 can drive the pressing plate 406 to rotate together, and at the same time, a space can be reserved for plastic to enter above the support plate 401.

[0029] A connecting rod 311 is fixedly installed in the middle of the carrying cage 306. Fixed plates 312 are equidistantly fixedly installed on the outer surface of the connecting rod 311. The elastic orifice plates 309 are elastically hinged on both sides of the fixed plates 312. A notch 313 is arranged on the side of the elastic orifice plate 309 away from the fixed plate 312. The pressure rod 310 is sleeved inside the notch 313. A pressure beam 314 is fixedly installed above the notch 313 of the pressure rod 310. The tops of the two symmetrical pressure rods 310 are fixedly connected by a cross beam 315. The cross beam 315 is located above the cover plate 305. Through such a setting, the plastic can be evenly laid in multiple layers, so as to increase the contact area with hot air, and further improve the efficiency of plastic softening.

[0030] The carrier cage 306 includes a ferrule 316 with openings on the outer ring. The top end of the ferrule 316 is threadedly connected to the cover plate 305. With such a setting, the ferrule 316 can be removed for cleaning. A covering part 317 that can be pulled outwards is arranged on the side wall of the ferrule 316. The covering part 317 is semi-circular, and the length of the covering part 317 is greater than the distance between the uppermost elastic orifice plate 309 and the lowermost elastic orifice plate 309. With such a setting, it can be used to put plastics into the carrier cage 306.

[0031] A groove 414 is arranged at the bottom end of the outer shell 201, and a protrusion 415 sleeved in the groove 414 is arranged on the upper surface of the bottom cover 202. The bottom cover 202 and the outer shell 201 are fixedly connected by screws, and the cover plate 305 and the outer shell 201 are fixedly connected by screws. With such a setting, it is convenient to remove the bottom cover 202 and the cover plate 305 to clean the inside of the outer shell 201.

[0032] The support plate 401 is circular, and teeth 416 are arranged on the edge of the support plate 401. A gear meshing with the teeth 416 is arranged at the output end of the power source 404. With such a setting, it can ensure that the support plate 401 rotates stably.

[0033] During use, remove the covering part 317, place the waste plastics into the interior of the carrier cage 306, place the carrier cage 306 inside the outer shell 201, connect the air return unit 303 and the air collecting hood 308, heat the air through the heating wire 304, and the air return unit 303 circulates the air. Thus, the hot air can be used to heat the plastics first, heat the plastics in layers in the carrier cage 306 sufficiently, and drive the elastic orifice plate 309 to swing by pressing the pressing rod 310 before the plastics soften. Thus, a gap can be formed between the elastic orifice plate 309 and the ferrule 316, and the plastic fragments fall into the material chute ring 409 through the gap and are discharged above the support plate 401 through the through hole 407. By revolving through the heating rod 403, the plastic fragments can be stirred and melted, so that the plastic fragments can be melted into a fluid, and under the action of the pressing plate 406, they can be extruded into the screw extruder 1, solving the problem that the melting speed of plastic fragments in the prior art is slow.

[0034] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0035] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heating furnace for a waste plastic recycling extruder, comprising a screw extruder (1), wherein the inlet end of the screw extruder (1) is connected to and penetrated by a heating sleeve (2), characterized in that: The heating sleeve (2) is divided into a hot air heating unit (3) at the upper end and a hot melt unit (4) at the lower end; The heating sleeve (2) comprises an outer shell (201), the bottom end of the outer shell (201) is provided with a bottom cover (202) connected to the outer shell (201), and the bottom cover (202) is connected to and penetrates the screw extruder (1); The hot melt unit (4) comprises a support plate (401), a conductive groove (402) is provided at the bottom end of the support plate (401), a conductive slip ring (417) is fixedly mounted on the upper surface of the bottom cover (202), a heating rod (403) connected to the conductive slip ring (417) is fixedly mounted on the upper surface of the support plate (401), a power source (404) for driving the support plate (401) to rotate is provided on one side of the housing (201), and a filter plate (410) connected to and penetrating the screw extruder (1) is embedded in the middle of the support plate (401); A mounting plate (405) is fixedly installed inside the housing (201) above the heating rod (403), a pressing plate (406) is arranged below the mounting plate (405), the pressing plate (406) and the mounting plate (405) are fixedly connected via a telescopic ring (316), a through hole (407) overlapping with the heating rod (403) is provided on the surface of the pressing plate (406), a notch groove (408) communicating with the through hole (407) is provided on the surface of the mounting plate (405), and a material sliding ring (409) communicating with the through hole (407) is fixedly installed below the notch groove (408); The shell (201) is located above the mounting plate (405) and is provided with a through hole group (301); a heat preservation sleeve (302) covering the through hole group (301) is fixedly installed on the outer surface of the shell (201); a return air unit (303) is connected to and penetrated by one side of the heat preservation sleeve (302); a heating wire (304) is arranged inside the heat preservation sleeve (302); a cover plate (305) is arranged at the top end of the shell (201); a supporting cage (306) is arranged at the bottom end of the cover plate (305) located above the mounting plate (405); a return air hole (307) is arranged at the top end of the cover plate (305); a wind collecting hood (308) covering the return air hole (307) is fixedly installed on the cover plate (305); and the wind collecting hood (308) is connected to and penetrates the return air unit (303); A symmetrical elastic hole plate (309) is elastically hinged at the inner bottom of the support cage (306), and a pressure rod (310) for pressing the elastic hole plate (309) is slidably connected to the middle of the support cage (306), and the pressure rod (310) extends to the top of the cover plate (305) and is slidably connected to the cover plate (305).

2. The heating furnace of the waste plastic recycling extruder according to claim 1, characterized in that: The upper surface and the lower surface of the support plate (401) are respectively provided with sealing rings (203), the upper and lower sealing rings (203) are staggered, and the bottom cover (202) and the outer shell (201) are both provided with sealing rings (204) sleeved in the sealing rings (203).

3. The heating furnace of the waste plastic recycling extruder according to claim 2, characterized in that: The heating rods (403) are divided into two inner and outer circles, each circle having a plurality of heating rods. The angles between the heating rods (403) in each circle are the same. The material sliding ring (409) is aligned with the through hole (407) of the outer circle. The pressure plate (406) is provided with convex rings (411) on the inner and outer sides of the through hole (407) of the outer circle. The material sliding ring (409) is sleeved on the outer surface of the convex ring (411).

4. The heating furnace of the waste plastic recycling extruder according to claim 3 is characterized in that: The inner ring heating rod (403) is longer than the outer ring heating rod (403), the inner ring heating rod (403) is always sleeved inside the through hole (407), the outer ring heating rod (403) is separated from the pressing plate (406) when the pressing plate (406) is at its highest point, the free end of the telescopic ring (316) is fixedly mounted with a rotating block (412), and the top end of the pressing plate (406) is fixedly mounted with a retaining ring (413) sleeved on the outer surface of the rotating block (412).

5. The heating furnace of the waste plastic recycling extruder according to any one of claims 1 to 4, characterized in that: A connecting rod (311) is fixedly installed in the middle of the supporting cage (306), and a fixing plate (312) is fixedly installed at equal intervals on the outer surface of the connecting rod (311). The elastic hole plate (309) is elastically hinged on both sides of the fixing plate (312), and a notch (313) is formed on the side of the elastic hole plate (309) away from the fixing plate (312). The pressure rod (310) is sleeved inside the notch (313), and a pressure beam (314) is fixedly installed above the notch (313) on the pressure rod (310). The top ends of the two symmetrical pressure rods (310) are fixedly connected by a cross beam (315), and the cross beam (315) is located above the cover plate (305).

6. The heating furnace of the waste plastic recycling extruder according to claim 5, characterized in that: The support cage (306) comprises a ferrule (316) with an outer ring opening, the top end of the ferrule (316) is threadedly connected to the cover plate (305), and the side wall of the ferrule (316) is provided with a covering portion (317) that can be withdrawn outward, the covering portion (317) is semi-annular, and the length of the covering portion (317) is greater than the distance between the uppermost elastic hole plate (309) and the lowermost elastic hole plate (309).

7. The heating furnace of the waste plastic recycling extruder according to claim 6, characterized in that: The bottom end of the housing (201) is provided with a groove (414), the upper surface of the bottom cover (202) is provided with a protrusion (415) which is sleeved in the groove (414), the bottom cover (202) and the housing (201) are fixedly connected by screws, and the cover plate (305) and the housing (201) are fixedly connected by screws.

8. The heating furnace of the waste plastic recycling extruder according to claim 7, characterized in that: The support plate (401) is circular, and teeth (416) are provided on the edge of the support plate (401). The output end of the power source (404) is provided with a gear meshing with the teeth (416).

Images