Plastic granulation and screening integrated device

Abstract

This invention discloses an integrated plastic granulation and screening device, specifically relating to the technical field of plastic granulation equipment. It includes an extrusion device, a cooling device, a drying device, a pelletizing device, and a screening device. When the machine stops, after the pressure in the feeding channel disappears, the residual molten plastic in the connecting groove and extrusion groove is squeezed outwards. After the telescopic block fully resets, an external compressed air source with heating function pushes the hollow tube and the second sealing component out of the second sealing groove through the air inlet channel. The heated compressed gas then blows away residual material in the extrusion groove and die orifice through the diversion groove, achieving automatic emptying and blowing of residual plastic. This prevents the molten plastic from cooling and solidifying in the mold, reducing manual cleaning operations and downtime. It also prevents the generation of impurity particles due to repeated heating, degradation, and carbonization of old materials, avoiding die orifice blockage and ensuring continuous and stable extrusion process and consistent granulation quality.

Description

Technical Field

[0001] This invention relates to the field of plastic granulation equipment technology, and more specifically, to an integrated plastic granulation and screening equipment. Background Technology

[0002] The working principle of plastic granulation equipment is to process plastic raw materials into granules through the coordinated operation of an extrusion system, a transmission system, and a heating and cooling system. First, the plastic raw material is fed into the hopper, and the screw, driven by the transmission system, rotates inside the barrel, conveying, compacting, melting, and homogenizing the material. During this process, the heating system provides the heat required for plasticization, while the cooling system removes excess heat to control the process temperature. Finally, the uniformly plasticized melt is continuously extruded through the die head under the pressure established by the screw, and then formed, cooled, and pelletized through a die to obtain the desired plastic granules. The integrated plastic granulation and screening equipment is a plastic processing machine that integrates the two major processes of plastic granulation and molding and granule screening and grading into the same equipment system.

[0003] However, in existing integrated plastic granulation and screening equipment, after the extruder die completes the extrusion operation, molten plastic inevitably remains in the internal flow channels and die orifices. As the die temperature drops after the equipment stops, this residual plastic will quickly cool and solidify, making cleaning difficult. This not only significantly increases the cost of manual maintenance and downtime, but if the cleaning is not thorough, the remaining old material is very likely to degrade and carbonize after being heated during the next startup, generating impurity particles, which in turn contaminate subsequent products and reduce granulation quality. At the same time, the long-term accumulated residue will gradually clog the die orifices, affecting the stability and efficiency of the extrusion process.

[0004] This invention provides an integrated plastic granulation and screening device, which aims to solve the problems of difficulty in cleaning residual molten plastic in the extruder mold after cooling and solidification in existing integrated plastic granulation and screening devices, which easily causes mold hole blockage and old material degradation and carbonization to contaminate the product, thereby affecting granulation quality and extrusion stability. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated plastic granulation and screening device to solve the problems mentioned in the background art, such as the difficulty in cleaning the residual molten plastic in the extruder mold after cooling and solidification, which easily causes die blockage and degradation and carbonization of old materials, thus affecting the granulation quality and extrusion stability.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated plastic granulation and screening device, comprising an extrusion device, a cooling device, an air drying device, a pelletizing device, and a screening device, wherein the discharge end of the extrusion device is provided with an extrusion die; The extrusion mold includes a base, which has a feeding channel, a telescopic groove and an air inlet channel. A telescopic block is slidably disposed in the telescopic groove. An extrusion head is disposed on the side of the telescopic block away from the base. The telescopic block has a connecting groove and an extrusion groove, which are respectively connected to the telescopic groove and the extrusion groove. The extrusion die is also provided with a blocking component for blocking the feed channel when the machine stops, a resetting component for driving the telescopic block to reset, and a purging component for introducing compressed gas into the connecting groove and the extrusion groove after the telescopic block is reset.

[0007] Preferably, the sealing assembly includes a limiting groove formed on the side of the telescopic block facing the feeding channel, a limiting plate slidably connected in the limiting groove, a second elastic member connected between the limiting plate and the limiting groove, and a first sealing plug connected to the side of the limiting plate facing the feeding channel. The end of the feeding channel facing the telescopic groove is provided with a first sealing groove adapted to the first sealing plug.

[0008] Preferably, the reset assembly includes a mounting groove formed on the side of the base away from the extrusion device, and a first elastic member connected between the extrusion head and the inner wall of the mounting groove.

[0009] Preferably, the purging assembly includes a hollow tube slidably connected in the air intake channel, a second sealing member connected to one end of the hollow tube facing the telescopic groove, a second sealing groove opened in the air intake channel facing the telescopic groove, and a third elastic member for driving the second sealing member to reset, wherein the outer wall of the hollow tube is provided with a plurality of diversion grooves.

[0010] Preferably, the base has a sliding groove inside that communicates with the air intake channel, and the third elastic element is sleeved between the hollow tube and the sliding groove, with one end connected to the hollow tube and the other end connected to the inner wall of the sliding groove.

[0011] Preferably, the air intake channel is connected to an external compressed air source with heating function, and the temperature of the compressed gas introduced is not lower than the softening temperature of the plastic to be processed.

[0012] Preferably, a guide rod is fixedly connected to the side of the limiting plate facing the feeding channel, and the first sealing plug is connected to the end of the guide rod facing the feeding channel.

[0013] Preferably, both ends of the connecting groove are connected to the interior of the telescopic groove.

[0014] Preferably, the second sealing member seals the second sealing groove in a non-purged state, and is driven to disengage from the second sealing groove by compressed air introduced into the air intake channel after the telescopic block is fully reset.

[0015] Preferably, the first sealing block resets and seals the first sealing groove before the telescopic block resets after the pressure in the feed channel disappears.

[0016] The technical effects and advantages of this invention are as follows: This invention, through the design of a telescopic block, a first sealing plug, and a second sealing component, allows for automatic emptying and purging of residual plastic in the extrusion groove. When the machine stops, after the pressure in the feed channel disappears, the first sealing plug, under the action of the second elastic component, preferentially resets and seals the first sealing groove. Subsequently, the telescopic block retracts under the action of the first elastic component, extruding the residual molten plastic in the extrusion groove and venting it outwards. After the telescopic block has fully reset, an external compressed air source with heating function pushes the hollow tube and the second sealing component out of the second sealing groove through the air inlet channel. The heated compressed air then blows away residual material in the extrusion groove and die orifice through the diversion channel, achieving automatic emptying and purging of residual plastic. This prevents the molten plastic from cooling and solidifying in the mold, reducing manual cleaning operations and downtime. It also prevents the generation of impurity particles due to repeated heating, degradation, and carbonization of old materials, avoiding die orifice blockage and ensuring continuous and stable extrusion process and consistent granulation quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the extrusion die structure of the present invention.

[0019] Figure 3 This is a cross-sectional view of the internal structure of the base of the present invention.

[0020] Figure 4 For the present invention Figure 3 Enlarged view of the structure of part A.

[0021] Figure 5 This is a schematic diagram of the structure of the first sealing groove portion of the present invention.

[0022] Figure 6 This is a schematic diagram of the hollow tube portion of the present invention.

[0023] Figure 7 This is a cross-sectional view of the internal structure of the mounting slot of the present invention.

[0024] Figure 8 This is a cross-sectional view of the internal structure of the limiting groove of the present invention.

[0025] The attached figures are labeled as follows: 1. Extrusion device; 11. Cooling device; 12. Drying device; 13. Pelletizing device; 14. Screening device; 2. Extrusion die; 21. Base; 22. Telescopic groove; 23. Feed channel; 24. Telescopic block; 25. Extrusion head; 26. Mounting groove; 27. First elastic element; 28. Extrusion groove; 29. ​​Connecting groove; 210. Limiting groove; 211. Limiting plate; 212. Second elastic element; 213. Guide rod; 214. First sealing plug; 215. First sealing groove; 216. Air inlet channel; 217. Sliding groove; 218. Hollow tube; 219. Second sealing element; 220. Second sealing groove; 221. Diverting groove; 222. Third elastic element. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] refer to Figures 1 to 8 An integrated plastic granulation and screening device according to an embodiment of the present invention includes an extrusion device 1, a cooling device 11, an air drying device 12, a pelletizing device 13, and a screening device 14.

[0028] refer to Figure 1 The extrusion device 1 is equipped with an extrusion die 2 at the discharge end, which is used to heat and melt the plastic raw material, and then continuously extrude the molten plastic from the extrusion die 2 through the pushing action of the extruder screw to form several plastic strips. Cooling device 11 is used to cool and reduce the temperature of the high-temperature plastic strip extruded by extrusion device 1, so that it can be quickly shaped and solidified; The air-drying device 12 is used to air-dry plastic strips with water adhering to their surface after being cooled by the cooling device 11, and to remove the residual moisture on their surface. The pelletizing device 13 is used to cut plastic strips that have been cooled and dried into plastic pellets of a certain length. The screening device 14 is used to screen and classify the plastic granules cut by the pelletizing device 13, remove defective products that do not meet the specifications, and obtain qualified plastic granules that meet the requirements.

[0029] refer to Figure 1 , Figure 2 and Figure 7The extrusion mold 2 includes a base 21, and a telescopic groove 22 is provided inside the base 21. A feeding channel 23 communicating with the inside of the telescopic groove 22 is provided on the side of the base 21 near the extrusion device 1. A telescopic block 24 is slidably connected inside the telescopic groove 22. The side of the telescopic block 24 away from the feeding channel 23 extends to the outside of the base 21 and is fixedly connected to an extrusion head 25. An installation groove 26 is provided on the side of the base 21 away from the extrusion device 1. A first elastic member 27 is sleeved inside the installation groove 26. One end of the first elastic member 27 is connected to the extrusion head 25, and the other end is connected to the inner wall of the installation groove 26.

[0030] refer to Figure 3 and Figure 8 The extrusion head 25 has a plurality of extrusion grooves 28 extending into the interior of the telescopic block 24 and arranged at equal intervals on the side away from the base 21, for extruding plastic strips. The telescopic block 24 has a connecting groove 29 on the side away from the extrusion head 25, which is connected to each extrusion groove 28. Both ends of the connecting groove 29 are connected to the interior of the telescopic groove 22.

[0031] refer to Figure 5 , Figure 7 and Figure 8 The telescopic block 24 has a limiting groove 210 on the side away from the extrusion head 25, which corresponds to the position of the feeding channel 23. A limiting plate 211 is slidably connected inside the limiting groove 210. A second elastic element 212 is connected between the side of the limiting plate 211 away from the feeding channel 23 and the limiting groove 210. The elastic coefficient of the first elastic element 27 is greater than that of the second elastic element 212. A guide rod 213 is fixedly connected to the side of the limiting plate 211 near the feeding channel 23. A first sealing plug 214 is fixedly connected to the other end of the guide rod 213. A first sealing groove 215 that can be adapted to the first sealing plug 214 is opened at one end of the feeding channel 23 located inside the telescopic groove 22.

[0032] refer to Figure 3 and Figure 4 The base 21 has two air intake channels 216 that communicate with the inside of the telescopic groove 22 on the side near the extrusion device 1. The positions of the two air intake channels 216 correspond to the two ends of the connecting groove 29. The base 21 has two sliding grooves 217 that correspond to the positions of the two air intake channels 216 and communicate with each other. The interior of each sliding groove 217 is slidably connected to a hollow tube 218 located inside the corresponding air intake channel 216. Both air intake channels 216 are connected to an external air source with heating function.

[0033] refer to Figure 4 and Figure 6One end of each of the two hollow tubes 218 extends into the interior of the telescopic groove 22 and is fixedly connected to the second sealing member 219. The air intake channel 216 is provided with a second sealing groove 220 that can be adapted to the second sealing member 219 at one end inside the telescopic groove 22. Multiple diversion grooves 221 that communicate with the internal cavity are provided on the outer wall of the end of each of the two hollow tubes 218 near the corresponding second sealing member 219.

[0034] refer to Figure 4 and Figure 6 A third elastic element 222 is sleeved between each of the two hollow tubes 218 and the corresponding sliding groove 217. One end of each third elastic element 222 is connected to one end of the corresponding hollow tube 218 located inside the sliding groove 217, and the other end is connected to the inner wall of the corresponding sliding groove 217.

[0035] In actual production, the extrusion device 1 is started, and the molten plastic is pushed by the screw into the expansion groove 22 through the feed channel 23. The pressure of the molten plastic acts on the first sealing block 214 and the expansion block 24 at the same time, overcoming the resistance of the first elastic element 27 and pushing the expansion block 24 to slide away from the base 21, so that the extrusion head 25 extends. At the same time, the molten plastic is diverted through the connecting groove 29 and enters each extrusion groove 28, and finally is continuously extruded from the die hole of the extrusion groove 28 to form plastic strips.

[0036] At this time, the external air source is closed, there is no air pressure in the air intake channel 216, and the two second sealing parts 219 remain in a retracted state under the action of the third elastic part 222, sealing in the second sealing groove 220.

[0037] When the machine needs to be stopped, the extrusion device 1 stops feeding, and the pressure of the molten plastic in the feed channel 23 gradually disappears. At this time, since the reset resistance of the telescopic block 24 is much greater than that of the first sealing plug 214, the first sealing plug 214 moves towards the feed channel 23 first under the reset action of the second elastic element 212. The guide rod 213 drives the first sealing plug 214 to embed into the first sealing groove 215, sealing the feed channel 23 and preventing the molten plastic in the telescopic groove 22 from flowing back to the extrusion device 1.

[0038] After the feed channel 23 is blocked, the telescopic block 24 gradually slides back towards the base 21 under the reset pulling force of the first elastic element 27. During the retraction process, the telescopic block 24 gradually squeezes the molten plastic remaining in the telescopic groove 22 and pushes the molten plastic remaining in the groove 29 towards the extrusion groove 28, so that this part of the molten plastic is continuously squeezed out from the die hole of the extrusion head 25 until the telescopic block 24 completely returns to the initial position.

[0039] After the telescopic block 24 is fully reset, the external air source with heating function is activated. The heated compressed air enters through the two air intake channels 216. Under the action of air pressure, the two hollow tubes 218 overcome the resistance of the third elastic element 222 and slide along the sliding groove 217 into the telescopic groove 22. This causes the second sealing element 219 to be dislodged from the second sealing groove 220 and extend into the connecting groove 29. The compressed air is diverted through the diversion groove 221 at the end of the hollow tube 218 and enters the telescopic groove 22. It is then blown along the connecting groove 29 towards each extrusion groove 28, completely blowing out or dispersing the trace amount of molten plastic remaining on the inner wall of the extrusion groove 28. After the purging is completed, the external air source is turned off. The second sealing element 219 is automatically reset under the action of the third elastic element 222 and re-seals the second sealing groove 220, completing the cleaning.

[0040] In summary, through the configuration of structures such as the telescopic block 24, the first sealing plug 214, and the second sealing component 219, when the machine stops, after the pressure in the feed channel 23 disappears, the first sealing plug 214 is reset first under the action of the second elastic component 212 and seals the first sealing groove 215. Subsequently, the telescopic block 24 retracts under the action of the first elastic component 27, and the residual molten plastic in the extrusion connecting groove 29 and the extrusion groove 28 is discharged outward. After the telescopic block 24 is completely reset, the external compressed air source with heating function pushes the hollow tube 218 and the second sealing component 219 out of the second sealing groove 220 through the air inlet channel 216. The heated compressed air blows the residual material in the extrusion groove 28 and the die hole through the diversion groove 221, realizing the automatic discharge and blowing of residual plastic, avoiding the molten plastic from cooling and solidifying in the mold, reducing manual cleaning operations and downtime, preventing the old material from generating impurity particles due to repeated heating degradation and carbonization, avoiding die hole blockage, and ensuring the continuous and stable extrusion process and the consistency of granulation quality.

[0041] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated plastic granulation and screening device, characterized in that, It includes an extrusion device (1), a cooling device (11), an air drying device (12), a pelletizing device (13) and a screening device (14), wherein the extrusion device (1) is provided with an extrusion die (2) at the discharge end. The extrusion mold (2) includes a base (21), the base (21) having a feeding channel (23), a telescopic groove (22) and an air inlet channel (216), a telescopic block (24) being slidably disposed in the telescopic groove (22), an extrusion head (25) being disposed on the side of the telescopic block (24) away from the base (21), and the telescopic block (24) having a connecting groove (29) and an extrusion groove (28), the connecting groove (29) being connected to the telescopic groove (22) and the extrusion groove (28) respectively; The extrusion die (2) is also provided with a blocking component for blocking the feed channel (23) when the machine stops, a resetting component for driving the telescopic block (24) to reset, and a purging component for introducing compressed gas into the connecting groove (29) and the extrusion groove (28) after the telescopic block (24) is reset.

2. The integrated plastic granulation and screening equipment according to claim 1, characterized in that, The sealing assembly includes a limiting groove (210) opened on the side of the telescopic block (24) facing the feeding channel (23), a limiting plate (211) slidably connected in the limiting groove (210), a second elastic member (212) connected between the limiting plate (211) and the limiting groove (210), and a first sealing plug (214) connected to the side of the limiting plate (211) facing the feeding channel (23). The feeding channel (23) has a first sealing groove (215) adapted to the first sealing plug (214) at one end facing the telescopic groove (22).

3. The integrated plastic granulation and screening equipment according to claim 1, characterized in that, The reset assembly includes a mounting groove (26) formed on the side of the base (21) away from the extrusion device (1), and a first elastic element (27) connected between the extrusion head (25) and the inner wall of the mounting groove (26).

4. The integrated plastic granulation and screening equipment according to claim 1, characterized in that, The purging assembly includes a hollow tube (218) slidably connected in the air intake channel (216), a second sealing member (219) connected to one end of the hollow tube (218) facing the telescopic groove (22), a second sealing groove (220) opened at one end of the air intake channel (216) facing the telescopic groove (22), and a third elastic member (222) for driving the second sealing member (219) to reset. The outer wall of the hollow tube (218) is provided with a plurality of diversion grooves (221).

5. The integrated plastic granulation and screening equipment according to claim 4, characterized in that, The base (21) has a sliding groove (217) that communicates with the air intake channel (216). The third elastic element (222) is sleeved between the hollow tube (218) and the sliding groove (217), with one end connected to the hollow tube (218) and the other end connected to the inner wall of the sliding groove (217).

6. The integrated plastic granulation and screening equipment according to claim 1, characterized in that, The air intake channel (216) is connected to an external compressed air source with heating function, and the temperature of the compressed gas introduced is not lower than the softening temperature of the plastic to be processed.

7. The integrated plastic granulation and screening equipment according to claim 2, characterized in that, The limiting plate (211) is fixedly connected to a guide rod (213) on the side facing the feeding channel (23), and the first sealing plug (214) is connected to the end of the guide rod (213) facing the feeding channel (23).

8. The integrated plastic granulation and screening equipment according to claim 1, characterized in that, Both ends of the connecting groove (29) are connected to the interior of the telescopic groove (22).

9. The integrated plastic granulation and screening equipment according to claim 4, characterized in that, The second sealing member (219) seals the second sealing groove (220) in a non-purge state, and is driven to disengage from the second sealing groove (220) by compressed air entering the air intake channel (216) after the telescopic block (24) is fully reset.

10. The integrated plastic granulation and screening equipment according to claim 2, characterized in that, After the pressure in the feed channel (23) disappears, the first sealing plug (214) resets before the telescopic block (24) and seals the first sealing groove (215).

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