Treatment device for recycling injection molding waste materials of PET (Polyethylene Terephthalate) plastic bottles

Abstract

The invention discloses a treatment device for PET plastic bottle injection molding waste recovery, and relates to the technical field of PET plastic bottle recovery, the treatment device comprises a base and a crushing cavity arranged on the base, two cutter shafts are symmetrically arranged in the crushing cavity, the two cutter shafts are in transmission through meshing gears and are connected with a motor, and a plurality of blade sets are spirally arranged on the outer circumferential surfaces of the cutter shafts in the axial direction at equal intervals; a driving part and a plurality of air injection parts are arranged in the cutter shaft, the driving part and the air injection parts are linked to form airflow, and the air injection parts are communicated to the blade group through air channels. The problems that in the prior art, when high-toughness PET waste is crushed, friction heating is remarkable, so that PET is locally softened and even fused to adhere to a blade set, frequent shutdown cleaning is needed, and the treatment efficiency is reduced are solved. The continuous crushing device has the advantages that double-effect cooling of heat dissipation in the cutter head and blowing of the adjacent cutting edges is achieved through linkage air injection of the air channels in the blades and the piston assemblies, heat generated by friction is remarkably reduced, PET is prevented from being fused to adhere to the blades, and the continuous crushing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of PET plastic bottle recycling, and particularly to a processing device for recycling injection molding waste of PET plastic bottles. Background Art

[0002] During the injection molding production process of PET plastic bottles, the generated waste materials (such as gate, flash, defective products, etc.) usually need to be recycled through processes such as crushing, cleaning, and pelletizing.

[0003] In the prior art, when recycling and crushing waste materials, it is necessary to go to a crusher for crushing. The traditional double-shaft crusher adopts a shearing and crushing method with a double-shaft cutter group. When crushing high-toughness PET waste materials (such as fiber-reinforced PET), significant heat is generated by friction. Especially during long-term crushing work, it is easy to cause local softening or even melting and adhesion of the PET to the cutter group, and it is necessary to frequently stop the machine for cleaning, reducing the processing efficiency.

[0004] In view of the above technical problems, the present invention discloses a processing device for recycling injection molding waste of PET plastic bottles. The present invention realizes double-effect cooling of heat dissipation inside the cutter head and blowing of adjacent cutting edges through the linkage jet of the internal air duct of the blade and the piston assembly, significantly reducing heat generation by friction, avoiding melting and adhesion of the PET to the blade, and improving the continuous crushing efficiency and other advantages. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a processing device for recycling injection molding waste of PET plastic bottles, so as to solve the technical problems in the prior art that significant heat is generated by friction when crushing high-toughness PET waste materials, resulting in local softening or even melting and adhesion of the PET to the cutter group, and frequent shutdown for cleaning, reducing the processing efficiency. The present invention has the advantages of realizing double-effect cooling of heat dissipation inside the cutter head and blowing of adjacent cutting edges through the linkage jet of the internal air duct of the blade and the piston assembly, significantly reducing heat generation by friction, avoiding melting and adhesion of the PET to the blade, and improving the continuous crushing efficiency.

[0006] The present invention is realized through the following technical solutions: The present invention discloses a processing device for recycling injection molding waste of PET plastic bottles, including a base and a crushing chamber provided on the base. Two cutter shafts are symmetrically arranged in the crushing chamber. The two cutter shafts are driven by meshing gears and connected to a motor. A plurality of cutter blade groups are arranged on the outer circumferential surface of the cutter shaft in an equidistant spiral arrangement along the axial direction. The cutter heads of adjacent cutter blade groups form a continuous shearing surface. A driving part and a plurality of jetting parts are arranged inside the cutter shaft. The driving part and the jetting part are linked to form an air flow, and the jetting part is connected to the cutter blade group through an air duct.

[0007] Furthermore, a central hole is axially formed inside the tool shaft, and the central hole penetrates through both ends of the tool shaft. The driving part includes a fixed shaft and a convex block structure fixed on the circumferential outer wall of the fixed shaft. The fixed shaft is fixedly connected to the base through a fixing plate. The air jetting part includes a piston assembly driven by the convex block, and the piston assemblies are circumferentially arranged inside the tool shaft. When the piston assemblies rotate synchronously with the tool shaft, a directional air flow is generated.

[0008] Furthermore, the blade group includes a disc-shaped base body sleeved on the tool shaft, and a plurality of tool heads are annularly arranged on the outer circumference of the base body. The tool heads of adjacent blade groups are staggeredly distributed in the axial projection.

[0009] Furthermore, the piston assembly includes a piston chamber, a piston disc and a push rod. The piston chamber is radially formed inside the tool shaft, and is provided with an air inlet hole communicating with the inner cavity of the central hole of the tool shaft and an air outlet hole communicating with the air passage. A through hole connecting the two chambers is axially formed on the piston disc. The push rod is connected to the piston disc, and a spring is further sleeved outside the push rod. The other end of the push rod extends into the central hole and contacts with the fixed shaft and the convex block through the rotation of the tool shaft to form a reciprocating motion.

[0010] Furthermore, one-way valve structures are provided on the air inlet hole, the air outlet hole and the through hole on the piston disc to form a directional air flow channel.

[0011] Furthermore, the air passage penetrates through the tool heads of the blade group, and its outlet end is arranged on the back of the tool head and extends obliquely towards the cutting edge of the adjacent tool head.

[0012] Furthermore, a spiral heat exchange tube is provided on the outer wall of the fixed shaft, and both ends of the heat exchange tube extend to the outside of the crushing chamber to form a circulating cooling water path.

[0013] Furthermore, the convex blocks are arranged along the axial direction of the fixed shaft, and the root of the convex block is smoothly transitioned with the outer wall of the fixed shaft.

[0014] Furthermore, the convex blocks of the two tool shafts are respectively arranged on the opposite sides of the fixed shaft. When the tool shafts rotate, the air jetting action occurs in the crushing area where the tool head is far from the opposite tool shaft.

[0015] The present invention has the following advantages: (1) By arranging an air passage inside the blade and the opening of the air passage being on the back of the tool head and facing the cutting edge of the adjacent tool head, the present invention realizes the dual effects of heat dissipation inside the tool head and purging of the adjacent cutting edges through the linkage air jetting of the air passage inside the blade and the piston assembly, significantly reducing heat generation due to friction, avoiding melting and adhesion of PET to the blade, and improving the continuous crushing efficiency.

[0016] (2) Through the cooperative design of the convex block and the guide ball, the present invention enables the air jetting action to be triggered only when the tool head is far from the shearing area, avoiding air flow interference with the crushing process and optimizing the cooling efficiency.

[0017] (3) By pre-cooling the inhaled air through the heat exchange tubes and combining with the oblique jet design at the airway outlet, the present invention enhances the local cooling effect of the airflow on the blade edge and prolongs the service life of the cutter head. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the crushing knife of the present invention; Figure 3 is a schematic cross-sectional view of the cutter shaft of the present invention; Figure 4 is a schematic diagram of the structure of the blade group of the present invention; Figure 5 is a schematic partial cross-sectional view of the cutter shaft of the present invention; Figure 6 is a schematic diagram of the structure of the fixed shaft of the present invention; Figure 7 For the present invention Figure 5 is a schematic diagram of the enlarged partial structure at A; Figure 8 is a schematic cross-sectional view of the inner insert block of the cutter head of the present invention.

[0019] In the figure: 1, base; 2, fragmentation mechanism; 3, embedded air-cooling mechanism; 4, connecting shaft; 5, air outlet hole; 6, through hole; 7, fixing plate; 8, gear; 9, motor; 10, central hole; 11, insert block; 12, guide ball; 13, spring; 14, heat exchange tube; 15, air inlet hole; 201, crushing cavity; 202, crushing knife; 221, cutter shaft; 222, blade group; 2221, matrix; 2222, cutter head; 2223, sleeved hole; 301, driving part; 302, jetting part; 303, airway; 321, piston assembly; 3211, piston cavity; 3212, piston disc; 3213, ejector rod; 331, fixed shaft; 332, convex block. Detailed Embodiment

[0020] The embodiments of the present invention will be described in detail below. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments. In the description of the present invention, words indicating orientation or position relationship such as "front", "rear", "left", "right", etc. are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] The embodiment discloses a processing device for recycling PET plastic bottle injection molding waste, as Figures 1-8As shown, it includes a base 1 and a crushing mechanism 2 arranged above the base 1, and the crushing mechanism 2 is used to crush the plastic bottle waste, so that the plastic bottle waste is broken into pieces for recycling; like Figure 1 As shown, the crushing mechanism 2 adopts a double-shaft crusher, which includes a crushing chamber 201 and a crushing knife 202 arranged inside the crushing chamber 201. Two crushing knives 202 are arranged inside the crushing chamber 201, and the two crushing knives 202 are symmetrically arranged. The shafts of the crushing knives 202 are driven by a motor 9, and the shafts of the two crushing knives 202 are meshed with each other through gears 8 for transmission.

[0022] Specifically, Figures 1-2 As shown, the crushing knife 202 includes a knife shaft 221 and a blade group 222 arranged outside the knife shaft 221. The blade groups 222 on the two knife shafts 221 are mirror-distributed with the central plane of the crushing chamber 201 as the symmetry axis. A plurality of blade groups 222 are arranged along the axial direction of the knife shaft 221, and the blade groups 222 are evenly arranged along the outer circumference of the knife shaft 221 according to equidistant spirals, thereby improving the continuous shearing efficiency through the rotationally symmetrical layout. In addition, the blade portion of the blade group 222 is arc-shaped and completely consistent with the spiral trajectory, ensuring that the cutting edge is always in contact with the material during rotation to form a continuous shearing surface.

[0023] Specifically, Figures 2-3 As shown, the blade group 222 consists of a disc-shaped base 2221 and a plurality of blade heads 2222 arranged in a circular array on the outer circumferential outer wall of the disc-shaped base 2221, and a sleeve hole 2223 is opened at the center of the disc-shaped base 2221, and the disc-shaped base 2221 is sleeved on the outside of the blade shaft 221 through the sleeve hole 2223. It should be noted that the disc-shaped base 2221 can be fixed to the outside of the blade shaft 221 by screws. In addition, the blade shaft 221 and the sleeve hole 2223 can be set to a polygon, thereby avoiding the blade group 222 from slipping during crushing, and connecting shafts 4 are concentrically fixed at both ends of the blade shaft 221, and the connecting shaft 4 is connected to the motor 9 for transmission.

[0024] When the injection molding waste is crushed, the plastic bottle waste is placed inside the crushing chamber 201, and the material is sheared and crushed by the rotating crushing knife 202. Considering that in actual operation, the frictional heat generated when crushing high-toughness PET waste (such as fiber-reinforced PET) is significant, especially in long-term crushing work, it is easy to cause local softening of PET or even melt and stick to the blade group 222, affecting the crushing effect, and requiring frequent shutdowns for cleaning. In order to reduce the occurrence of adhesion, in this embodiment, an embedded air cooling mechanism 3 is provided to cool the blade group 222 to avoid the blade group 222 from generating high temperature due to long-term friction, thereby preventing the plastic from melting and sticking to the blade group 222.

[0025] In this embodiment, ifFigures 1-5 As shown, the embedded air-cooling mechanism 3 is set for air-cooling, specifically, the embedded air-cooling mechanism 3 is configured to take away the heat on the tool tip 2222 through the flow of gas. More specifically, the embedded air-cooling mechanism 3 includes a driving part 301, a jetting part 302 and an air duct 303. Among them, a central hole 10 is axially formed inside the tool shaft 221, and the central hole 10 penetrates through both end faces of the tool shaft 221. The driving part 301 is arranged inside the central hole 10. In addition, a plurality of jetting parts 302 are axially arranged inside the tool shaft 221, and the jetting parts 302 are respectively aligned with the blade groups 222 axially arranged outside the tool shaft 221. An air duct 303 is formed inside the blade group 222, and the air duct 303 is communicated with the jetting part 302, so that the gas jetted by the jetting part 302 can pass through and be jetted out through the air duct 303 inside the blade group 222. Furthermore, the heat of the blade group 222 can be dissipated by the gas flowing inside the blade group 222.

[0026] Specifically, the driving part 301 drives the jetting part 302 to intake and jet air through the rotation of the tool shaft 221. As Figure 5 and Figure 6 shown, the driving part 301 includes a fixed shaft 331 and a convex block 332. Among them, the fixed shaft 331 is arranged inside the central hole 10 of the tool shaft 221, and the fixed shaft 331 is concentric with the central hole 10. The diameter of the fixed shaft 331 is smaller than the inner diameter of the central hole 10. A convex block 332 is fixedly arranged outside the fixed shaft 331, and a plurality of convex blocks 332 are arranged axially along the fixed shaft 331. The plurality of convex blocks 332 are respectively aligned with the blade groups 222 outside the tool shaft 221. The convex block 332 is arranged on one side of the fixed shaft 331, and the root of the convex block 332 is smoothly transitioned with the outer circumferential outer wall of the fixed shaft 331. The outer diameter of the convex block 332 is larger than the outer diameter of the central shaft. The convex block 332 is a continuous arc surface from the root to the vertex, and its radius increases from the root to the vertex.

[0027] As Figure 3 、 Figure 5 and Figure 7 shown, the jetting part 302 includes a plurality of piston assemblies 321 arranged in an annular array with the center of the tool shaft 221 as the center. The piston assembly 321 includes a piston chamber 3211, a piston disk 3212 and a push rod 3213. Among them, the piston chamber 3211 is axially formed along the tool shaft 221. Each piston chamber 3211 corresponds to the tool tip 2222 on the corresponding blade group 222. The piston disk 3212 is arranged inside the piston chamber 3211, and the piston disk 3212 is concentric with the piston chamber 3211. The outer circumferential outer wall of the piston disk 3212 is slidably and sealingly arranged with the inner wall of the piston chamber 3211. One end of the piston disk 3212 facing the center of the tool shaft 221 is fixedly provided with a push rod 3213, and the push rod 3213 slidably passes through the wall of the tool shaft 221 and extends into the central hole 10.

[0028] An air inlet hole 15 is provided at one end of the piston chamber 3211 facing the center of the tool shaft 221, and an air outlet hole 5 is provided at one end of the piston chamber 3211 facing the outer wall of the tool shaft 221. Both ends of the air inlet hole 15 are respectively communicated with the central hole 10 at the center of the tool shaft 221 and the inside of the piston chamber 3211. It should be noted that the air inlet hole 15 is set to have a one-way flow direction, and the air inlet hole 15 can only intake air into the piston chamber 3211. When the piston disk 3212 moves towards the center of the tool shaft 221, the compressed gas by the piston disk 3212 will not be discharged through the air inlet hole 15. Correspondingly, a through hole 6 is axially penetrated inside the piston disk 3212, and through the through hole 6, the two chambers on both sides of the piston disk 3212 inside the piston chamber 3211 are communicated. And the through hole 6 is set to have the same one-way flow direction as the air inlet hole 15, and the flow direction of the through hole 6 is set to intake air from the chamber at the air inlet hole 15 end towards the chamber at the air outlet hole 5 end. In addition, the air outlet hole 5 is also set to have a one-way flow direction, and the flow direction is set to discharge air from the piston chamber 3211 to the outside.

[0029] During specific implementation, lubricating paste can be provided inside the piston chamber 3211 to reduce the friction between the piston disk 3212 and the piston chamber 3211.

[0030] Through the above settings, when the piston disk 3212 moves towards the air outlet hole 5 direction inside the piston chamber 3211, the piston disk 3212 will squeeze the air in the chamber at the air outlet hole 5 end and discharge it through the air outlet hole 5. And the inner diameter of the air outlet hole 5 is smaller than the inner diameter of the piston chamber 3211, thereby accelerating the air flow rate and flowing out through the air passage 303 from inside the blade group 222. And while the piston disk 3212 is moving, air can be intaken through the movement of the piston disk 3212 at the air inlet hole 15, so that the chamber at the air inlet hole 15 end is filled with gas. When the piston disk 3212 moves towards the center direction of the tool shaft 221, since the air outlet hole 5 has a one-way flow direction, the air outlet hole 5 cannot intake air, avoiding the gas that takes away the heat of the blade group 222 during discharge from being re-sucked into the piston chamber 3211. When the piston disk 3212 is moving, the air inlet hole 15 cannot discharge air. Therefore, the air inside the chamber at the air inlet hole 15 end will enter the chamber at the air outlet hole 5 through the through hole 6 on the piston disk 3212, and then continue to inflate the chamber at the air outlet hole 5. After that, during the next movement of the piston disk 3212, the air flow will be ejected again to take away the heat.

[0031] Through the air inlet hole 15, each time the air entering the piston chamber 3211 enters through the central hole 10, as Figure 1As shown, the connecting shafts 4 at both ends of the tool shaft 221 extend to the outside of the crushing chamber 201. The fixed shafts 331 at both ends pass through the crushing chamber 201 and extend to the outside of the crushing chamber 201 respectively. A fixing plate 7 is fixed on the base 1, and the two ends of the fixed shaft 331 are fixedly connected to the fixing plate 7 outside the crushing chamber 201 respectively, so that the air entering the piston chamber 3211 each time enters from outside the crushing chamber 201, preventing the hot air discharged from the inside of the crushing chamber 201 from being re - inhaled.

[0032] Specifically, as Figures 2-5 、 Figure 7 shown, there are multiple air channels 303 inside the blade group 222, and the number of air channels 303 is the same as the number of cutter heads 2222 outside the disc - shaped base 2221. The air channels 303 are arranged in a circumferential annular array centered on the center of the disc - shaped base 2221 along the circumference of the disc - shaped base 2221. Each air channel 303 corresponds to a cutter head 2222. One end of the air channel 303 penetrates the inner - ring inner wall of the disc - shaped base 2221, and the air channel 303 is aligned and communicated with the air outlet holes 5 on the corresponding jet part 302. The other end of the air channel 303 passes through the back outer wall of the cutter head 2222, that is, the back of the blade of each cutter head 2222. Through the setting of the air channel 303, the air discharged from the air outlet holes 5 can flow and be discharged inside the blade group 222 through the air channel 303. Furthermore, the fast - flowing gas can take away the heat of the blade group 222. In addition, the inner diameter of the air channel 303 is smaller than the inner diameter of the piston chamber 3211.

[0033] It should be noted that in other embodiments, there can be multiple air channels 303, and the multiple air channels 303 are all communicated with the air outlet holes 5 of the piston chamber 3211, and the cross - sectional area of the multiple air channels 303 is smaller than the inner diameter of the piston chamber 3211.

[0034] In this embodiment, the piston chamber 3211 can be arranged on the wall of the tool shaft 221 through an insert structure, that is, an insert is connected to the wall of the tool shaft 221 by screws, and the insert structure is embedded inside the wall of the tool shaft 221, and the piston chamber 3211 is opened inside the insert structure. Thus, through the setting of the insert structure, it is convenient to clean or replace worn parts, reducing the maintenance cost.

[0035] In order to enable the jet part 302 to automatically intake and exhaust air when the tool shaft 221 rotates, as Figure 5As shown in the figure, a guiding ball 12 is fixedly arranged at one end of the ejector rod 3213 inside the central hole 10, and a spring 13 is further arranged between the guiding ball 12 and the inner wall of the inner ring of the central hole 10. The spring 13 is sleeved outside the ejector rod 3213, and the ejector rod 3213 is supported for reset by the spring 13. When the spring 13 is in a released state, the piston disc 3212 is located at one end facing the air inlet hole 15 inside the piston chamber 3211. At this time, the guiding ball 12 contacts the outer circumferential outer wall of the fixed shaft 331. When the guiding ball 12 contacts the outer circumferential outer wall of the convex block 332 and the guiding ball 12 is at the vertex position of the convex block 332, the spring 13 is compressed. At this time, the piston disc 3212 is at one end of the air outlet hole 5 inside the piston chamber 3211. That is, when the cutter shaft 221 rotates, the piston disc 3212 linearly moves inside the piston chamber 3211 through the contact of the guiding ball 12 with the fixed shaft 331 and the convex block 332, thereby realizing air intake and air outlet. It should be noted that the guiding ball 12 can also be set as a rolling ball, so as to reduce friction through the contact of the rolling ball with the fixed shaft 331 and the convex block 332. In addition, the convex blocks 332 on the outer circumferential walls of the central shafts inside the two cutter shafts 221 are respectively arranged on the opposite sides. In other words, the convex block 332 is arranged on the outer wall of the fixed shaft 331 facing the side wall of the crushing chamber 201, and the convex block 332 is not on the side where the two fixed shafts 331 face each other. Therefore, every time the cutter shaft 221 rotates, air outlet will only occur when the cutter head 2222 rotates to face the lower part of the crushing chamber 201 and is close to the side wall direction, avoiding the cutter heads 2222 on the two cutter shafts 221 from jetting air in the shearing area facing upward or facing each other, so as to prevent the waste material from being blown up and affecting the crushing work.

[0036] In addition, as Figure 4 shown, in order to further improve the cooling effect of the cutter head 2222, the opening of the air duct 303 at the back of the cutter head 2222 is set to face the blade direction of the adjacent cutter head 2222. Therefore, the air ejected from the air duct 303 can blow towards the blade of the adjacent cutter head 2222, and the temperature of the adjacent cutter head 2222 is reduced by the gas blowing towards the blade, thereby realizing the dual-effect cooling of heat dissipation inside the cutter head 2222 and purging of the adjacent cutter head 2222, and improving the cooling effect.

[0037] In specific implementation, as Figure 4 and Figure 8 shown, an insert block 11 can be embedded in the back of the cutter head 2222. An inclined hole of the air duct 303 is opened inside the insert block 11, and a straight hole is opened inside the disc-shaped base body 2221. The straight hole is communicated with the inclined hole, and the opening of the air duct 303 on the back of the cutter is facing the blade of the adjacent cutter head 2222. Therefore, the gas ejected from the air duct 303 can be ejected towards the adjacent blade to dissipate heat and cool the blade.

[0038] Furthermore, as Figure 1 、 Figure 2 、Figure 5 and Figure 6 As shown in Figure 6 , a heat exchange tube 14 is spirally wound around the outer wall of the fixed shaft 331, and both ends of the heat exchange tube 14 can be connected to an external water tank to form a cooling water path. The air in the inner cavity of the central hole 10 is heat-exchanged and cooled by the flowing of cooling water inside the heat exchange tube 14, so that the air sucked into the piston cavity 3211 is low-temperature air, thereby reducing the temperature of the air discharged from the air outlet 5 and further improving the cooling of the tool bit 2222.

[0039] The principle of the present invention is as follows: When the present invention is in use, first start the motor 9. The motor 9 drives the tool shaft 221 to rotate through speed reduction transmission. The tool shaft 221 makes the double tool shafts 221 rotate synchronously through the engagement of the gears 8 for crushing. While the tool shaft 221 is rotating, the ejector rods 3213 arranged in an array in the inner cavity of the tool shaft 221 will successively contact the convex blocks 332 on the outer wall of the fixed shaft 331. When the ejector rod 3213 transitions from the outer wall of the fixed shaft 331 to the vertex of the convex block 332, it will cause the piston disc 3212 to move linearly inside the piston cavity 3211. And when the ejector rod 3213 transitions from the vertex of the convex block 332 to the outer wall of the fixed shaft 331, the ejector rod 3213 is reset by the spring 13, so that the piston disc 3212 reciprocates inside the piston cavity 3211, making each tool bit 2222 intake and exhaust air when rotating away from the opposite shearing surface of the two tool shafts 221. The air that has been heat-exchanged and cooled by the heat exchange tube 14 inside the central hole 10 is sucked into the piston cavity 3211, enters the air passage 303 through the air outlet 5, and is ejected through the opening of the air passage 303 provided on the back of the tool bit 2222. Thus, the air flows inside the tool bit 2222 to take away heat, and at the same time blows towards the cutting edge of the adjacent tool bit 2222 when ejected, so as to achieve double-effect cooling of the tool bit 2222 through heat dissipation inside the tool bit 2222 and blowing of adjacent tool bits 2222, and avoid the tool bit 2222 from overheating frequently during long-term crushing work, resulting in local softening or even melting and adhesion of the PET to the blade group 222.

[0040] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A processing device for recycling PET plastic bottle injection molding waste, including a base (1) and a crushing chamber (201) provided on the base (1), characterized in that, Two cutter shafts (221) are symmetrically arranged in the crushing cavity (201). The two cutter shafts (221) are driven by meshing gears (8) and connected to a motor (9). A plurality of blade groups (222) are arranged on the outer circumferential surface of the cutter shaft (221) along an equidistant spiral in the axial direction. The cutting heads (2222) of adjacent blade groups (222) form a continuous shearing surface. A driving part (301) and a plurality of air jet parts (302) are arranged inside the cutter shaft (221). The driving part (301) and the air jet parts (302) are linked to form an air flow, and the air jet parts (302) are communicated with the blade groups (222) through air channels (303).

2. The processing device for recycling PET plastic bottle injection waste according to claim 1, characterized in that, A central hole (10) is axially formed inside the cutter shaft (221), and the central hole (10) penetrates through both ends of the cutter shaft (221). The driving part (301) includes a fixed shaft (331) and a convex block (332) structure fixed on the circumferential outer wall of the fixed shaft (331). The fixed shaft (331) is fixedly connected to the base (1) through a fixing plate (7). The air jet part (302) includes a piston assembly (321) driven by the convex block (332), and the piston assemblies (321) are circumferentially arranged inside the cutter shaft (221). When the piston assemblies (321) rotate synchronously with the cutter shaft (221), a directional air flow is generated.

3. The processing device for recycling PET plastic bottle injection waste according to claim 1, characterized in that, The blade group (222) includes a disc-shaped base body (2221) sleeved on the cutter shaft (221). A plurality of cutting heads (2222) are annularly arranged on the outer circumference of the base body (2221). The cutting heads (2222) of adjacent blade groups (222) are staggeredly distributed in the axial projection.

4. The processing device for recycling PET plastic bottle injection waste according to claim 2, characterized in that, The piston assembly (321) includes a piston chamber (3211), a piston disc (3212) and a push rod (3213). The piston chamber (3211) is radially formed inside the cutter shaft (221), and is provided with an air inlet hole (15) communicating with the inner cavity of the central hole (10) of the cutter shaft (221) and an air outlet hole (5) communicating with the air channel (303). A through hole (6) connecting the two chambers is axially penetrated through the piston disc (3212). The push rod (3213) is connected to the piston disc (3212), and a spring (13) is also sleeved outside the push rod (3213). The other end of the push rod (3213) extends into the central hole (10) and contacts the fixed shaft (331) and the convex block (332) through the rotation of the cutter shaft (221) to form a reciprocating motion.

5. The processing device for recycling PET plastic bottle injection waste according to claim 4, characterized in that, One-way valve structures are provided on the air inlet hole (15), the air outlet hole (5) and the through hole (6) on the piston disc (3212) to form a directional air flow channel.

6. The processing device for recycling PET plastic bottle injection waste according to claim 1, characterized in that, The air channel (303) penetrates through the cutting heads (2222) of the blade group (222), and its outlet end is arranged on the back of the cutting head (2222) and extends obliquely towards the edge of the adjacent cutting head (2222).

7. The processing device for recycling PET plastic bottle injection waste according to claim 2, characterized in that, A spiral heat exchange tube (14) is arranged on the outer wall of the fixed shaft (331). Both ends of the heat exchange tube (14) extend outside the crushing cavity (201) to form a circulating cooling water path.

8. The processing device for recycling PET plastic bottle injection waste according to claim 2, characterized in that, The convex blocks (332) are arranged along the axial direction of the fixed shaft (331), and the root of the convex block (332) is smoothly transitioned with the outer wall of the fixed shaft (331).

9. The processing device for recycling PET plastic bottle injection waste according to claim 8, wherein, The bumps (332) of the two cutter shafts (221) are respectively arranged on the opposite sides of the fixed shaft (331). When the cutter shafts (221) rotate, the jetting action occurs in the crushing area where the cutter head (2222) is far away from the opposite cutter shaft (221).

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