A water-cooled pelletizing device for recycling plastic waste

Abstract

The invention relates to the technical field of preparation of recycled plastic particles, and specifically provides a water-cooled pelletizing device for recycling plastic waste, comprising a frame, an extrusion barrel and a conveying mechanism arranged on the frame, the conveying mechanism conveying melted plastic waste into the extrusion barrel, a die hole is opened on the template of the extrusion barrel, the extrusion barrel extrude the plastic waste to form a plastic masterbatch strip, a knife disc is also arranged on the frame, a tool is arranged on the knife disc, the tool is used to cut the plastic masterbatch strip, a compensation component is arranged on the knife disc, the compensation component is used to change the contact force of the tool on the knife disc to the template, so that the contact force of the tool to the template is increased when the tool cuts the plastic masterbatch strip, and then the particles with better quality can be cut, and the wear degree of the tool is reduced after the cutting is completed, thereby increasing the service life of the tool, so that the wear degree of the tool can be reduced while the particles with better quality are cut.

Description

Technical Field

[0001] The invention relates to the technical field of recycled plastic particle preparation, in particular to a water-cooled pelletizing device for recycling plastic waste. Background Art

[0002] Plastic recycling plays an important role in modern industry, especially in addressing environmental issues and reducing plastic pollution. The pelletizing process is a key step in the recycling of plastic waste, affecting the quality and production efficiency of recycled plastics.

[0003] For example, Chinese patent CN109605606B discloses a rotary feeding mechanism for an underwater pelletizer. The scheme is provided with a motor, a transmission shaft, a transition shaft, a first connecting member, a cylinder and a cutter disc shaft. A cutter disc is installed at the front end of the cutter disc shaft, and a template is provided on the side of the cutter disc away from the cutter disc shaft. The rotary feeding mechanism is used to keep the cutter disc close to the template at all times. Cooling water enters the cutting chamber from the water inlet pipe, and the motor is started to drive the cutter disc to rotate. The cylinder pushes the cutter disc close to the template. The molten polymer is squeezed out of the die hole of the template and is scraped off by the tool of the high-speed rotating cutter disc. The polymer particles are transported to the downstream equipment from the water outlet pipe together with the cooling water. During use, the wear of the cutter disc needs to be compensated by the axial feeding of the cutter disc shaft driven by the cylinder to ensure that the cutter disc is always close to the template.

[0004] In the above scheme, a cylinder is used to push the cutter disc to move axially, and the cutter disc is always close to the template, that is, the force between the cutter disc and the template is constant, so that the cutter disc is always subjected to a large friction force, which aggravates the wear of the cutter disc and thus reduces the service life of the cutter disc. In addition, when the cutter disc is subjected to a large force when cutting the polymer extruded from the die hole, it may push the cylinder back, thereby causing a gap between the grinding disc and the template, resulting in poor quality of the cut particles. Summary of the invention

[0005] Based on this, it is necessary to provide a water-cooled pelletizing device for recycling plastic waste to address the current problems of large wear of the cutter disc and poor quality of cut particles.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A water-cooled pelletizing device for recycling plastic waste, comprising:

[0008] A frame, wherein a conveying mechanism is disposed on the frame, and the conveying mechanism is used to convey the melted plastic waste;

[0009] An extrusion barrel, wherein the extrusion barrel is hollow inside and has a template at one end, and the template is provided with a plurality of die holes in a circumferential array, and the conveying mechanism conveys the plastic waste into the extrusion barrel and extrude it through the die holes;

[0010] A water storage tank, wherein the water storage tank is arranged on the frame, and the template of the extrusion cylinder is located in the water storage tank;

[0011] A cutting assembly, the cutting assembly comprises a driving disc and a knife disc, the knife disc is rotatably arranged on the template, the knife disc has a plurality of knives in a circumferential array abutting against the template, the driving disc is used to drive the knife disc to rotate, a compensation assembly is arranged between the driving disc and the knife disc, the compensation assembly is used to change the abutment force of the plurality of knives on the template, and the compensation assembly is configured as follows:

[0012] When a plurality of cutters cut the plastic masterbatch strips extruded from the die hole, the compensation component increases the contact force of the plurality of cutters on the die plate;

[0013] After a plurality of cutters cut the plastic masterbatch strips extruded from the die hole, the compensation component reduces the abutment force of the plurality of cutters on the template;

[0014] The compensation assembly includes a first connecting member and a second connecting member that can be elastically extended and retracted, the first connecting member connects the axis of the cutter disc and the drive disc, and the second connecting member has a plurality of second connecting members and the plurality of second connecting members are arranged in a circular array between the cutter disc and the drive disc, and two ends of the second connecting member are respectively ball-connected to the cutter disc and the drive disc;

[0015] The driving disc drives the cutter disc to rotate, and a plurality of second connecting members are inclined along the rotation direction. When the cutter cuts the plastic masterbatch strip extruded from the die hole, the cutter is subjected to a reaction force so that the driving disc rotates relative to the cutter disc, and the inclination angles of the plurality of second connecting members increase to compress the second connecting members, and the abutment force of the second connecting members on the cutter disc increases. After the cutter cuts the plastic masterbatch strip extruded from the die hole, the second connecting member is reset to reduce the abutment force of the plurality of cutters on the template.

[0016] Furthermore, the first connecting member includes a connecting sleeve and a fixed shaft, one end of the fixed shaft is vertically and fixedly connected to the axis of the driving disk, the other end of the fixed shaft passes through the axis of the knife disk, one end of the connecting sleeve is fixedly connected to the knife disk and sleeved on the fixed shaft, the other end of the connecting sleeve is connected to a second disc spring, and the other end of the disc spring is fixedly connected to the driving disk.

[0017] Furthermore, a limit assembly is provided on the driving disc, and the limit assembly is used to limit the maximum distance between the cutter disc and the driving disc.

[0018] Furthermore, the limiting assembly includes a limiting sleeve, one end of which is fixedly disposed on the driving disk and sleeved on the outer circumference of the connecting sleeve, the other end of the limiting sleeve is provided with a first buckle, the outer circumference of the connecting sleeve connected to the second disc spring is provided with a second buckle, there is a gap between the first buckle and the second buckle, the first buckle and the second buckle are in contact to limit the maximum distance of the blade disc from the driving disk.

[0019] Furthermore, the second connecting member includes a sliding rod and a sliding cylinder, the sliding rod and the sliding cylinder are socketed with each other, and a second disc spring is provided at the socketing position, and when the second disc spring is in the original length state, the sliding rod and the sliding cylinder are in the state of being farthest apart.

[0020] Furthermore, the conveying mechanism includes a conveying cylinder and a conveying auger, the conveying cylinder is fixedly arranged on the frame, the conveying auger is arranged in the conveying cylinder, and the melted plastic waste enters the conveying cylinder and is conveyed into the extrusion cylinder by the conveying auger.

[0021] Furthermore, a heat preservation component is provided at the bottom of the conveying cylinder, and the heat preservation component is used to keep the melted plastic waste warm.

[0022] Furthermore, a refinement plate is arranged in the extrusion barrel, and the refinement plate divides the extrusion barrel into two cavities distributed along the axial direction. The refinement plate is provided with a plurality of fine holes. The melted plastic waste in the extrusion barrel is refined by the refinement plate and then extruded through the die holes on the template.

[0023] Furthermore, a driving mechanism is also provided on the frame, and the driving mechanism is used to drive the driving disk to rotate.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a compensation component so that the contact force of the tool on the template is increased when the tool cuts the plastic masterbatch strips, thereby being able to cut out particles of better quality, and reducing the degree of wear of the tool after cutting, thereby increasing the service life of the tool, so that particles of better quality can be cut while reducing the degree of wear of the tool.

[0026] The present invention provides a first disc spring and a second disc spring to provide a buffer between the cutter disc and the drive disc, thereby reducing the influence of axial fluctuations on the rotating shaft of the drive motor and reducing the occurrence of failures of the drive motor.

[0027] The invention prevents the condensation of the melted plastic waste in the extrusion barrel by arranging a heat preservation component.

[0028] The invention arranges a thinning plate in the extrusion barrel, so that the melting plastic waste in the extrusion barrel can further improve the mixing uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a water-cooled pelletizing device for recycling plastic waste provided in one embodiment of the present invention;

[0030] Figure 2 for Figure 1 A front view of a water-cooled pelletizing device for recycling plastic waste provided in one embodiment;

[0031] Figure 3 for Figure 2 A cross-sectional view of a water-cooled pelletizing device for recycling plastic waste along AA provided in one embodiment;

[0032] Figure 4 for Figure 2 An axonometric view of a water-cooled pelletizing device for recycling plastic waste provided in an embodiment of the present invention, cut along AA;

[0033] Figure 5 for Figure 4 A partial enlarged view of a portion X of a water-cooled pelletizing device for recycling plastic waste provided in an embodiment;

[0034] Figure 6 A schematic diagram of the structure of a cutting assembly of a water-cooled pelletizing device for recycling plastic waste provided in one embodiment of the present invention;

[0035] Figure 7 for Figure 6 A front view of a cutting assembly of a water-cooled pelletizing device for recycling plastic waste provided in one embodiment;

[0036] Figure 8 for Figure 7 A cross-sectional view along BB of a cutting assembly of a water-cooled pelletizing device for recycling plastic waste provided in one embodiment;

[0037] Fig. 9 A schematic structural diagram of a second connecting member of a water-cooled pelletizing device for recycling plastic waste provided in one embodiment of the present invention;

[0038] Fig.10 for Fig. 9 A cross-sectional view of a second connecting member of a water-cooled pelletizing device for recycling plastic waste provided in one embodiment along CC;

[0039] Fig.11 for Fig.10 A partial enlarged view of the second connecting member Y of the water-cooled pelletizing device for recycling plastic waste provided in one embodiment.

[0040] in:

[0041] 100, frame; 110, conveying mechanism; 111, conveying cylinder; 112, feeding funnel; 113, conveying auger; 120, extrusion cylinder; 121, template; 122, die hole; 123, refinement plate; 124, round groove; 130, water storage tank; 131, water pump; 132, water pipe; 133, water outlet; 140, blower; 150, driving motor; 151, driving shaft; 160, rotating motor;

[0042] 200, cutting assembly; 210, driving disc; 211, ball joint groove; 220, cutter disc; 221, cutter; 230, first connecting member; 231, fixed shaft; 232, connecting sleeve; 233, first disc spring; 240, second connecting member; 241, sliding rod; 242, guide rod; 243, first articulated ball; 244, sliding cylinder; 245, receiving groove; 246, guide groove; 247, second articulated ball; 248, second disc spring;

[0043] 300, limiting sleeve; 310, first buckle; 320, second buckle. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is 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.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] Refer to the following Figure 1-Figure 11 The following describes a water-cooled pelletizing device for recycling plastic waste provided by the present invention.

[0048] A water-cooled pelletizing device for recycling plastic waste is suitable for recycling and granulating plastic waste, and includes a frame 100. The frame 100 is provided with an extrusion barrel 120. A template 121 is connected to one end of the extrusion barrel 120. The template 121 is provided with a plurality of die holes 122 in a circumferential array. After the melted plastic waste is filled in the extrusion barrel 120, it is extruded through the die holes 122 on the template 121. The extruded shape is a strip, specifically called a plastic masterbatch strip. The frame 100 is provided with a conveying mechanism 110 for continuously conveying the melted plastic waste into the extrusion barrel 120 so as to continuously extrude the plastic masterbatch strip. A cutting assembly 200 is provided at a position close to the template 121 on the frame 100. The cutting assembly 200 is used to cut the extruded plastic masterbatch strip into granules. In order to reduce the heat generated during cutting, a water tank 130 is provided on the frame 100. The template 121 connected to the extrusion barrel 120 and the cutting assembly 200 are both located in the water tank 130. The water tank 130 is filled with water, which can effectively take away the heat generated by cutting and can also enable the cut particles to quickly cool and shape, so that the molding quality of the plastic particles is better. At the same time, a water pumping mechanism is connected to the water tank 130, and the water pumping mechanism includes a water pump 131 and a water pipe 132. The water pipe 132 is connected to the water tank 130, and the water pump 131 pumps water in the water tank 130. A water outlet 133 is also provided on the water tank 130, and the water outlet 133 is used for drainage, and the cut particles are discharged along with the water flow.

[0049] The cutting assembly 200 includes a driving disc 210 and a knife disc 220. The knife disc 220 is rotatably arranged on the template 121. A plurality of knives 221 in a circumferential array are arranged on one end surface of the knife disc 220 close to the template 121. The plurality of knives 221 are in contact with the surface of the template 121. When the knife disc 220 rotates, the plurality of knives 221 rotate on the template 121 so as to cut the plastic masterbatch strips extruded from the die hole 122 into particles. The driving disc 210 is connected to the knife disc 220. The driving disc 210 is used to drive the knife disc 220 to rotate. A compensation assembly is arranged between the driving disc 210 and the knife disc 220 of the present invention. The compensation assembly The component is used to change the contact force of the tool 221 against the template 121. It can be understood that when the force of the tool 221 against the template 121 is greater, the effect of the tool 221 in cutting the plastic masterbatch strip is better, but the wear degree of the tool 221 is greater, thereby reducing the service life of the tool 221. If the force of the tool 221 against the mold is less, when cutting harder plastic masterbatch strips, the tool 221 may be separated from the template 121, so that the cut particles have more burrs and the quality of particle molding is low. Therefore, a compensation component is set to alleviate the above situation. The compensation component is configured as follows:

[0050] When the plurality of cutters 221 rotate to the position of the die hole 122 and start cutting the plastic masterbatch strips extruded from the die hole 122, the compensation component increases the contact force of the cutters 221 against the die plate 121 so as to better cut the plastic masterbatch strips;

[0051] When a plurality of cutters 221 are about to move to a position between two adjacent die holes 122 after cutting a plastic masterbatch strip, the compensation component reduces the contact force of the cutter 221 against the die plate 121 , thereby reducing the wear of the cutter 221 and extending the service life of the cutter 221 .

[0052] Specifically, the compensation component of this embodiment includes a first connecting member 230 and a second connecting member 240 that can be elastically retracted. The first connecting member 230 connects the axis of the driving disk 210 and the cutter disk 220, and the number of the second connecting members 240 is several and the several second connecting members 240 are arranged in a circular array between the cutter disk 220 and the driving disk 210. The two ends of the second connecting member 240 are respectively ball-connected to the cutter disk 220 and the driving disk 210. In the initial state, when the driving disk 210 does not drive the cutter disk 220 to rotate, the several second connecting members 240 are all in an inclined state, specifically toward the rotation direction of the driving disk 210, for example Figure 6 The driving disk 210 shown in the figure rotates in the direction (rotation direction is Figure 6The second connecting member 240 is in an inclined state. When the driving disc 210 rotates, the inclined second connecting member 240 drives the cutter disc 220 to rotate. Since the tool 221 on the cutter disc 220 abuts against the template 121, when the tool 221 starts to cut the plastic masterbatch strip, the tool 221 is subjected to the reaction force of the plastic masterbatch strip, so that the rotation speed of the cutter disc 220 is reduced. At this time, the rotation speed of the driving disc 210 remains unchanged, and the cutter disc 220 and the rotating disc rotate relative to each other. At this time, the inclination angle of the second connecting member 240 increases, thereby compressing the second connecting member 240. Since the second connecting member 240 and the first connecting member 230 have the ability of elastic expansion and contraction, the force generated by the elastic deformation of the second connecting member 240 causes the tool 221 to abut against the template 121. The force is increased, thereby making the effect of the tool 221 cutting the plastic masterbatch strip better. When the cutting is completed, the tool 221 passes over the cut plastic masterbatch strip. At this time, the tool 221 is no longer in contact with the plastic masterbatch strip, that is, the tool 221 is no longer subjected to the force of the plastic masterbatch strip, and the second connecting member 240 and the first connecting member 230 are reset, the inclination angle of the second connecting member 240 is gradually reduced, and the rotation speed of the knife disc 220 is gradually increased. After the second connecting member 240 is reset, the rotation speed of the knife disc 220 is restored to the speed before cutting, so that the tool 221 can cut at the maximum speed during the next cutting to ensure the cutting quality. At the same time, the force of the tool 221 on the template 121 is reduced to the initial state, thereby reducing the degree of wear of the tool 221 when it does not cut the plastic masterbatch strip.

[0053] The above structure can increase the contact force of the tool 221 on the template 121 when cutting the plastic masterbatch strips, thereby cutting out particles of better quality. After cutting, the wear of the tool 221 is reduced, thereby increasing the service life of the tool 221. This allows the tool 221 to be cut out with better quality while reducing the wear of the tool 221, thus killing two birds with one stone.

[0054] More specifically, the first connecting member 230 in this embodiment is composed of a connecting sleeve 232 and a fixed shaft 231, one end of the fixed shaft 231 is vertically and fixedly connected to the axis of the driving disk 210, and the other end of the fixed shaft 231 passes through the axis of the cutter disk 220 and is slidably connected to the cutter disk 220. One end of the connecting sleeve 232 is fixedly connected to the axis of the cutter disk 220 and sleeved on the fixed shaft 231, and the other end of the connecting sleeve 232 is connected to the first disc spring 233, the other end of the first disc spring 233 is fixedly connected to the driving disk 210, and the first disc spring 233 is sleeved on the fixed shaft 231. When the cutter disk 220 and the driving disk 210 are close to each other, the first disc spring 233 can be compressed, and the first disc spring 233 can give the cutter disk 220 and the driving disk 210 a force to reset.

[0055] It should be noted that in order to ensure that the cutter disc 220 and the drive disc 210 rotate stably, the fixed shaft 231 extends out of a portion of the cutter disc 220 when passing through the cutter disc 220, and a circular groove 124 for accommodating the fixed shaft 231 is opened at the axis center of the template 121. The fixed shaft 231 passes through the cutter disc 220 and extends into the circular groove 124. The circular groove 124 plays a guiding and positioning role so that the cutter disc 220 and the drive disc 210 can rotate stably without deviation.

[0056] In a further embodiment, a limit assembly is provided on the driving disc 210 of the present invention, and the limit assembly is used to limit the maximum distance between the cutter disc 220 and the driving disc 210, that is, the maximum distance between the cutter disc 220 and the driving disc 210 is a fixed value.

[0057] Specifically, the limiting assembly includes a limiting sleeve 300, one end of which is fixedly arranged on the driving disk 210 and sleeved on the outer periphery of the connecting sleeve 232, and a first buckle 310 is arranged on the other end of the limiting sleeve 300, and the first buckle 310 is an annular plate, and the diameter of the annular plate is smaller than the diameter of the limiting sleeve 300, and a second buckle 320 is fixedly arranged on the outer periphery of the connecting sleeve 232 at the connection position with the first disc spring 233, and the second buckle 320 is also an annular plate, and the diameter of the annular plate is larger than the diameter of the connecting sleeve 232. In the initial state, there is a gap between the first buckle 310 and the second buckle 320. When the cutter disc 220 and the drive disc 210 move away from each other, the first buckle 310 and the second buckle 320 gradually approach each other. When the two are in contact, the cutter disc 220 and the drive disc 210 are restricted from moving further away, thereby limiting the maximum distance between the cutter disc 220 and the drive disc 210. When the cutter disc 220 moves closer to the drive disc 210, it is not restricted. At this time, the first disc spring 233 between the cutter disc 220 and the drive disc 210 will be compressed.

[0058] It can be understood that, when the tool 221 is in abutment against the template 121 in the initial state, the first disc spring 233 is in a compressed state at this time, so that the tool 221 has a certain force and abuts against the template 121, and there is a gap between the first buckle 310 and the second buckle 320, so that the cutter disc 220 and the drive disc 210 have a margin for relative axial movement. As the tool 221 is used, the tool 221 will wear. If the first disc spring 233 is not initially in a compressed state, the tool 221 will be out of contact with the template 121 when it is worn. Therefore, the first disc spring 233 can push the cutter disc 220 to move away from the drive disc 210 when the tool 221 is worn to compensate for the wear of the tool 221, thereby ensuring that the tool 221 can always abut against the template 121.

[0059] It should be noted that the clearance margin between the first buckle 310 and the second buckle 320 is set as the maximum margin of the wear of the tool 221. When the tool 221 is worn to the point of being unusable, the first buckle 310 and the second buckle 320 contact each other to limit the contact between the tool 221 and the template 121, indicating that a new tool 221 needs to be replaced.

[0060] More specifically, the second connecting member 240 of the present invention is composed of a slide bar 241 and a slide cylinder 244, the slide bar 241 and the slide cylinder 244 are sleeved together, a second disc spring 248 is arranged at the position where the slide bar 241 and the slide cylinder 244 are sleeved together, the two ends of the second disc spring 248 are respectively fixedly connected to the slide bar 241 and the slide cylinder 244, a receiving groove 245 is provided on one end of the slide cylinder 244, the second disc spring 248 is located in the receiving groove 245, and a guide groove 246 is also provided in the receiving groove 245, the slide bar 241 is provided with a guide groove 246, and the slide bar 241 is provided with a guide groove 246. A guide rod 242 is provided on one end. When the slide tube 244 and the slide rod 241 are connected, the guide rod 242 of the slide rod 241 is located in the guide groove 246. At the same time, one end of the slide rod 241 where the guide rod 242 is provided and one end of the slide tube 244 where the accommodating groove 245 is provided are provided with structures identical to the above-mentioned first clip 310 and the second clip 320, thereby limiting the maximum extension and retraction length of the slide rod 241 and the slide tube 244. When the second disc spring 248 is at its original length, the slide rod 241 and the slide tube 244 are at their longest length.

[0061] To facilitate the ball joint of the slide rod 241 and the slide cylinder 244 with the cutter disc 220 and the drive disc 210 respectively, a first hinge ball 243 is fixedly provided on the slide rod 241, and a second hinge ball 247 is fixedly provided on the slide cylinder 244. Ball joint grooves 211 are provided on the drive disc 210 and the cutter disc 220. The first hinge ball 243 on the slide rod 241 is located in the hinge groove on the cutter disc 220, and the second hinge ball 247 on the slide cylinder 244 is located in the ball joint groove 211 of the drive disc 210.

[0062] It should be noted that the elastic coefficients of the first disc spring 233 and the second disc spring 248 in the present invention are relatively large. Since the degree of wear of the tool 221 is very small and a larger force is required, it is necessary to enable the first disc spring 233 and the second disc spring 248 to provide a larger force when a smaller deformation occurs.

[0063] In a further embodiment, the conveying mechanism 110 of the present invention includes a conveying cylinder 111 and a conveying auger 113. The conveying cylinder 111 is fixedly arranged on the frame 100. One end of the conveying cylinder 111 is connected to the extrusion cylinder 120. A feed port is opened on the conveying cylinder 111, and a feed funnel 112 is connected to the feed port. The melted plastic waste enters the conveying cylinder 111 through the feed funnel 112. The conveying auger 113 is arranged in the conveying cylinder 111. The conveying auger 113 is coaxially arranged with the conveying cylinder 111, and the blades of the conveying auger 113 are in sliding contact with the inner wall of the conveying cylinder 111. When the conveying auger 113 rotates, the melted plastic waste is conveyed into the extrusion cylinder 120.

[0064] It should be noted that a rotating motor 160 is disposed on the frame 100 , and the rotating motor 160 drives the conveying auger 113 to rotate so that the conveying auger 113 conveys the melted plastic waste.

[0065] In a further embodiment, a heat preservation component is further provided on the frame 100, and the heat preservation component is close to the bottom of the conveying cylinder 111. The heat preservation component is used to maintain the temperature inside the conveying cylinder 111 to prevent the melted plastic waste from condensing in the conveying cylinder 111 due to the low temperature and being unable to be transported.

[0066] Specifically, the heat preservation assembly includes a plurality of blowers 140 , and a heating wire is installed on the air outlet of the blower 140 . The heating wire heats the gas blown out from the air outlet, and the heated gas is blown toward the conveying cylinder 111 to maintain the temperature inside the conveying cylinder 111 .

[0067] It should be noted that the heat preservation component of the present invention is not limited to the above structure, but can also be a heater, or a heat preservation layer is provided on the periphery of the conveying cylinder 111, etc., which is not specifically limited here.

[0068] In a further embodiment, a refinement plate 123 is provided in the extrusion barrel 120 of the present invention, and the refinement plate 123 divides the extrusion barrel 120 into two cavities distributed along its axial direction. A plurality of fine holes are opened on the refinement plate 123. The melted plastic waste in the extrusion barrel 120 passes through one of the cavities and flows through the fine holes into the other cavity. When passing through the fine holes, the melted plastic waste is extruded once and then mixed again, thereby improving the mixing uniformity of the melted plastic waste, so that the plastic masterbatch strips extruded through the die hole 122 have a uniform texture, and can then be cut into particles of better quality.

[0069] In a further embodiment, a driving mechanism is further provided on the frame 100 of the present invention, and the driving mechanism can drive the driving disk 210 of the cutting assembly 200 to rotate.

[0070] Specifically, the driving mechanism includes a driving motor 150 and a driving shaft 151. The driving motor 150 is fixedly arranged on the frame 100. The rotating shaft of the driving motor 150 is connected to the driving shaft 151. The driving shaft 151 can be fixedly connected to the driving disk 210 relative to the other end of the driving shaft 151. The rotation of the driving motor 150 drives the driving shaft 151 to rotate, and the rotation of the driving shaft 151 drives the driving disk 210 to rotate.

[0071] Combined with the above embodiments, the specific working process of a water-cooled pelletizing device for recycling plastic waste provided by the present invention is described as follows:

[0072] start up:

[0073] The driving motor 150 , the rotating motor 160 , the blower 140 and the water pump 131 are started.

[0074] Input melted plastic waste:

[0075] The melted plastic waste is added from the feed hopper 112 and enters the conveying cylinder 111. The conveying auger 113 drives the melted plastic waste to move from the conveying cylinder 111 to the extrusion cylinder 120. Due to the action of the blower 140, the melted plastic waste is prevented from condensing in the conveying cylinder 111. The melted plastic waste is mixed more evenly after passing through the refinement plate 123 in the extrusion cylinder 120, and is thus evenly extruded from the die hole 122.

[0076] Cutting:

[0077] At this time, the tool 221 on the knife disc 220 abuts against the template 121 and rotates. When the tool 221 contacts the plastic masterbatch strip extruded from the die hole 122, the tool 221 is acted upon by the plastic masterbatch strip, and the rotation speed of the knife disc 220 is reduced, while the driving disc 210 at this time still maintains the original rotation speed. At this time, the knife disc 220 and the driving disc 210 rotate relative to each other, thereby increasing the inclination angle of the slide bar 241 and the slide cylinder 244 so that the second disc spring 248 between the slide bar 241 and the slide cylinder 244 is compressed, and at the same time, the first disc spring 233 between the connecting sleeve 232 and the driving disc 210 is also compressed, thereby increasing the abutment force of the tool 221 on the template 121. The tool 221 is enabled to cut the plastic masterbatch strips better, and the cut particles are discharged along with the water flow through the water outlet 133 of the water tank 130. After cutting, the tool 221 moves to a position between two adjacent mold holes 122. At this time, the tool 221 is no longer affected by the force of the plastic masterbatch strips, and the first disc spring 233 and the second disc spring 248 are reset, so that the rotation speed of the knife disc 220 is restored to the initial speed before cutting, ensuring that the rotation speed of the tool 221 is the maximum when cutting next time. At the same time, the contact force of the tool 221 on the template 121 is weakened to the force when it is not cutting, thereby reducing the wear of the tool 221 and increasing the service life of the tool 221.

[0078] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A water-cooled pelletizing device for recycling plastic waste, characterized in that: include: A frame, wherein a conveying mechanism is disposed on the frame, and the conveying mechanism is used to convey the melted plastic waste; An extrusion barrel, wherein the extrusion barrel is hollow inside and has a template at one end, and the template is provided with a plurality of die holes in a circumferential array, and the conveying mechanism conveys the plastic waste into the extrusion barrel and extrude it through the die holes; A water storage tank, wherein the water storage tank is arranged on the frame, and the template of the extrusion cylinder is located in the water storage tank; A cutting assembly, the cutting assembly comprises a driving disc and a knife disc, the knife disc is rotatably arranged on the template, the knife disc has a plurality of knives in a circumferential array abutting against the template, the driving disc is used to drive the knife disc to rotate, a compensation assembly is arranged between the driving disc and the knife disc, the compensation assembly is used to change the abutment force of the plurality of knives on the template, and the compensation assembly is configured as follows: When a plurality of cutters cut the plastic masterbatch strips extruded from the die hole, the compensation component increases the contact force of the plurality of cutters on the die plate; After a plurality of cutters cut the plastic masterbatch strips extruded from the die hole, the compensation component reduces the abutment force of the plurality of cutters on the template; The compensation assembly includes a first connecting member and a second connecting member that can be elastically retracted, the first connecting member connects the axis of the cutter disc and the drive disc, and the second connecting member has a plurality of second connecting members and the plurality of second connecting members are arranged in a circular array between the cutter disc and the drive disc, and two ends of the second connecting member are respectively ball-connected to the cutter disc and the drive disc; The driving disc drives the cutter disc to rotate, and a plurality of second connecting members are inclined along the rotation direction. When the cutter cuts the plastic masterbatch strip extruded from the die hole, the cutter is subjected to a reaction force so that the driving disc rotates relative to the cutter disc, and the inclination angles of the plurality of second connecting members increase to compress the second connecting members, and the abutment force of the second connecting members on the cutter disc increases. After the cutter cuts the plastic masterbatch strip extruded from the die hole, the second connecting member is reset to reduce the abutment force of the plurality of cutters on the template.

2. The water-cooled pelletizing device for recycling plastic waste according to claim 1, characterized in that: The first connecting member includes a connecting sleeve and a fixed shaft, one end of the fixed shaft is vertically and fixedly connected to the axis of the driving disk, the other end of the fixed shaft passes through the axis of the cutter disk, one end of the connecting sleeve is fixedly connected to the cutter disk and sleeved on the fixed shaft, the other end of the connecting sleeve is connected to a second disc spring, and the other end of the disc spring is fixedly connected to the driving disk.

3. The water-cooled pelletizing device for recycling plastic waste according to claim 2, characterized in that: A limit assembly is arranged on the driving disc, and the limit assembly is used to limit the maximum distance between the cutter disc and the driving disc.

4. The water-cooled pelletizing device for recycling plastic waste according to claim 3, characterized in that: The limiting assembly includes a limiting sleeve, one end of which is fixedly disposed on the driving disk and sleeved on the outer circumference of the connecting sleeve, the other end of the limiting sleeve is provided with a first buckle, and the outer circumference of the connecting sleeve connected to the second disc spring is provided with a second buckle, there is a gap between the first buckle and the second buckle, the first buckle and the second buckle are in contact to limit the maximum distance of the cutter disc from the driving disk.

5. The water-cooled pelletizing device for recycling plastic waste according to claim 1, characterized in that: The second connecting member includes a sliding rod and a sliding cylinder, the sliding rod and the sliding cylinder are sleeved with each other, and a second disc spring is provided at the sleeved position, and when the second disc spring is in the original length state, the sliding rod and the sliding cylinder are in the state of being farthest apart.

6. The water-cooled pelletizing device for recycling plastic waste according to claim 1, characterized in that: The conveying mechanism comprises a conveying cylinder and a conveying auger. The conveying cylinder is fixedly arranged on the frame, and the conveying auger is arranged in the conveying cylinder. The melted plastic waste enters the conveying cylinder and is conveyed into the extrusion cylinder by the conveying auger.

7. The water-cooled pelletizing device for recycling plastic waste according to claim 6, characterized in that: A heat preservation component is arranged at the bottom of the conveying cylinder, and the heat preservation component is used for keeping the melted plastic waste warm.

8. The water-cooled pelletizing device for recycling plastic waste according to claim 1, characterized in that: A refinement plate is arranged in the extrusion barrel, and the refinement plate divides the extrusion barrel into two cavities distributed along the axial direction. The refinement plate is provided with a plurality of fine holes. The melted plastic waste in the extrusion barrel is refined by the refinement plate and then extruded through the die holes on the template.

9. The water-cooled pelletizing device for recycling plastic waste according to claim 1, characterized in that: The frame is also provided with a driving mechanism, and the driving mechanism is used for driving the driving disk to rotate.

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