An engineering plastic particle extruding and cutting device

Abstract

The application relates to the technical field of engineering plastic granulating devices, in particular to an engineering plastic particle extruding and granulating device, which comprises a device frame, a plastic extruding furnace is fixedly installed at the upper end of the device frame through bolts, a water tank is also fixedly installed at the upper end of the device frame, the water tank is located on one side of the plastic extruding furnace, a strip discharger is fixedly connected to the outer surface of the plastic extruding furnace, a movable box is slidably installed in the water tank, under the pushing of flowing water formed by a water spraying opening, the movable box automatically moves along the water tank, and plastic strips are sequentially led through a cooling area until the granulating frame, so that the plastic strips are automatically guided from an extruding end to a granulating end; compared with the existing engineering plastic extruding and granulating equipment, the degree of manual intervention is reduced, and the risk of scalding caused by high-temperature plastic strips to operators is reduced.

Description

Technical Field

[0001] This invention relates to the field of engineering plastic pelletizing equipment, specifically to an engineering plastic pellet extrusion and pelletizing device. Background Technology

[0002] Engineering plastics possess excellent mechanical properties, heat resistance, wear resistance, and dimensional stability, and are widely used in automotive parts, electronics, machinery manufacturing, and precision industries. In the production of engineering plastic granules, engineering plastic raw materials are typically melted and plasticized in a plastic extrusion furnace, then continuously extruded through nozzles to form plastic strips. These strips are then cooled and pelletized to produce granules, facilitating subsequent transportation, storage, and molding processes such as injection molding and extrusion. Therefore, engineering plastic granule extrusion and pelletizing equipment has become an indispensable piece of production equipment in the engineering plastics production process. Existing engineering plastic granule extrusion and pelletizing devices can cool and pelletize plastic strips during normal continuous production. However, during the equipment startup phase, since the plastic strips have just been extruded from the extruder head and have not yet entered the subsequent cooling and pelletizing stations, operators usually need to use auxiliary tools such as wooden sticks, copper rods, and iron hooks to lift the high-temperature plastic strips from the extruder head and gradually guide them along the water tank before the equipment can enter the normal pelletizing state. The entire strip guiding process mainly relies on manual labor. Furthermore, since the plastic strips are in a high-temperature molten or semi-molten state, operators need to be in close contact with the extruder head, posing safety hazards such as burns. At the same time, when the plastic strips are relatively soft or the continuous extrusion speed is high, the plastic strips are prone to sagging, tangling, deviation, or failure to accurately enter the pelletizing mechanism, resulting in prolonged startup time and affecting production efficiency. Therefore, this application proposes an engineering plastic granule extrusion and pelletizing device. Summary of the Invention

[0003] The purpose of this invention is to provide an engineering plastic granule extrusion and pelletizing device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an engineering plastic granule extrusion and pelletizing device, comprising a frame, a plastic extrusion furnace fixedly mounted on the upper end of the frame by bolts, a water tank fixedly mounted on the upper end of the frame, the water tank being located on one side of the plastic extrusion furnace, an extruder fixedly connected to the outer surface of the plastic extrusion furnace, the output end of the extruder facing the water tank, and multiple nozzles fixedly mounted inside the extruder, the engineering plastic molten inside the plastic extrusion furnace being extruded through the extruder to form continuous plastic strips, a movable box slidably mounted inside the water tank, the movable box being used to support and guide the plastic strips entering the water tank, a pelletizing frame fixedly mounted at the end of the water tank away from the plastic extrusion furnace, a cutting wheel rotatably mounted inside the pelletizing frame, and multiple blades uniformly fixedly mounted on the outer surface of the cutting wheel, when the cooled engineering plastic strip moves to the pelletizing frame, the cutting wheel is driven to rotate, causing the blades on the surface of the cutting wheel to contact the plastic strip in sequence, thereby cutting the continuous plastic strip into granular engineering plastic.

[0005] As a further embodiment of the present invention, a guide plate is fixedly installed inside the water tank, and a rack and a water level plate are fixedly installed on the surface of the guide plate respectively. The rack is located above the water level plate. The movable box is slidably installed inside the water tank, and a guide gear is rotatably installed on the surface of the movable box. The guide gear meshes with the rack. A float is rotatably installed at the bottom of the movable box. The float is located above the water level plate. Through the buoyancy between the float and the cooling water inside the water tank, the movable box can remain suspended and move along the inside of the water tank.

[0006] As a further embodiment of the present invention, the upper end of the movable box is provided with multiple guide grooves, each of which is respectively provided with a corresponding nozzle, so that the plastic strips extruded from each nozzle can enter the corresponding guide grooves for guidance. A prism plate is slidably installed on the upper end of the movable box. The plastic strips extruded from the nozzles pass over the guide grooves under the action of their own extrusion thrust and motion inertia, and move to the top of the prism plate so that they can move synchronously with the movable box in the future.

[0007] As a further embodiment of the present invention, a guide plate is fixedly installed inside the active box, the guide plate is located below the prism plate, and a drive gear is rotatably installed inside the active box. The drive gear is fixedly connected to the guide gear so that the drive gear and the guide gear can rotate synchronously.

[0008] As a further embodiment of the present invention, a rectangular hole is provided on the surface of the guide plate. The rectangular hole is inclined and a balance shaft is slidably installed inside the rectangular hole. A transmission gear is fixedly installed at the front end of the balance shaft and an output wheel is fixedly installed at the rear end of the balance shaft.

[0009] As a further embodiment of the present invention, when the balance shaft slides downward along the inclined rectangular hole, the transmission gear and the driving gear mesh with each other, and the output wheel simultaneously rolls in contact with the outer surface of the float. When the float rotates under the push of the water flow formed by the spray nozzle, the float drives the balance shaft to rotate synchronously through the output wheel. The balance shaft further drives the transmission gear to rotate, and drives the guide gear to rotate synchronously through the meshing action between the transmission gear and the driving gear. Since the guide gear and the rack remain meshed.

[0010] As a further embodiment of the present invention, an isolation plate is fixedly installed inside the pelletizing rack, and a sliding plate is slidably installed on the upper end of the isolation plate. The cutting wheel is located above the prism plate and the sliding plate, and a gap is maintained between the outer surface of the cutting wheel and the prism plate, so that the plastic strip can be located between the cutting wheel and the prism plate.

[0011] As a further embodiment of the present invention, a sealing sleeve is fixedly installed on the surface of the active box, and a push rod is slidably installed inside the sealing sleeve. The push rod and the sealing sleeve are connected by an auxiliary spring. The auxiliary spring is in a compressed state in the initial state and is used to provide a reset driving force for the push rod. A locking hole is provided on the surface of the sealing sleeve.

[0012] As a further embodiment of the present invention, a locking block is fixedly installed at the end of the push rod away from the balance shaft via a spring plate. The locking block passes through the lock hole and can cooperate with the lock hole to lock the push rod. A push plate is fixedly installed at the end of the push rod near the balance shaft. The push plate is in contact with the outer surface of the balance shaft. When the push rod moves along the inside of the sealing sleeve, the push plate simultaneously pushes the balance shaft to move along the rectangular hole on the guide plate.

[0013] As a further embodiment of the present invention, a rocker is rotatably mounted on the bottom end of the isolation plate, and a slot that cooperates with the rocker is opened on the bottom end of the sliding plate. An unlocking sleeve is slidably mounted on the bottom end of the isolation plate. One end of the rocker is disposed inside the slot, and the other end is in contact with the unlocking sleeve. When the sliding plate moves away from the cutting wheel, the side wall of the slot pushes the rocker to rotate, causing the other end of the rocker to push the unlocking sleeve to move towards the movable box.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses the flowing water from the spray nozzle to propel the movable box along the water tank automatically, and to drive the plastic strip through the cooling area to the pelletizing frame. This achieves automatic guidance of the plastic strip from the extrusion end to the pelletizing end. Compared with the existing engineering plastic extrusion pelletizing equipment, which requires operators to use wooden sticks, copper rods or iron hooks to gradually pull the high-temperature plastic strip through the water tank and into the pelletizing mechanism when starting up, this invention reduces the degree of manual intervention and reduces the risk of burns to operators caused by the high-temperature plastic strip. 2. This invention, through the transmission and engagement structure between the guide gear, drive gear, transmission gear, balance shaft, output wheel, and float wheel, after completing one plastic strip conveying and pelletizing cycle, utilizes the continuously flowing cooling water inside the water tank to drive the float wheel to rotate. The output wheel, balance shaft, transmission gear, and drive gear then drive the guide gear to rotate, causing the movable box to automatically return to the side of the plastic extrusion furnace along the rack, completing the automatic reset. This eliminates the need for manual repositioning of the strip feeding mechanism back to the starting position, achieving automatic cyclic operation of the strip feeding mechanism and improving the automation level and production continuity in the continuous extrusion pelletizing process of engineering plastics. 3. This invention, through the linkage structure between the sliding plate, rocker plate, unlocking sleeve, locking block, push rod, and auxiliary spring, enables the unlocking mechanism to be automatically triggered while the plastic strip pushes the sliding plate to move. This releases the lock on the push rod and drives the balance shaft to move, causing the transmission gear and the drive gear to re-engage. This achieves automatic switching of the movable box reset mechanism, eliminating the need for additional control mechanisms or manual operation to automatically connect the actions of guiding the strip, pelletizing, and resetting. This further improves the automation level and operational reliability of the entire engineering plastic granule extrusion and pelletizing device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an engineering plastic granule extrusion and pelletizing device. Figure 2 This is a structural diagram of the water tank area; Figure 3 This is a schematic diagram of the internal structure of the water tank; Figure 4 Diagram showing the positional relationship between the water level plate and the movable box; Figure 5 This is a structural diagram showing the disassembled structure of the activity box; Figure 6 This is a schematic diagram of the internal structure of the activity box; Figure 7 A schematic diagram of the disassembled guide plate; Figure 8 This is a structural diagram showing the positional relationship between the cutting wheel and the movable box; Figure 9 This is a structural schematic diagram of the cross-section of the isolation plate; Figure 10 This is a schematic diagram of the internal structure of the sealing sleeve; Figure 11 This is a schematic diagram of the internal structure of the nozzle.

[0016] In the diagram: 1. Frame; 2. Steering shaft; 3. Plastic extrusion furnace; 4. Water tank; 5. Pelletizer; 21. Drive belt; 22. Drive motor; 101. Outlet device; 102. Nozzle; 103. Lifting beam; 104. Rack; 105. Water level plate; 106. Guide plate; 107. Spray nozzle; 108. Reset spring; 109. Nozzle; 110. Auxiliary plate; 111. Plug; 201. Movable box; 202. Guide gear; 203. Float; 204. Prism plate; 205. Passive shaft; 206. Guide groove; 207. Guide plate; 208. Lever; 209. Sealing sleeve; 210. Drive gear; 211. Push plate; 212. Transmission gear; 213. Output wheel; 214. Balance shaft; 215. Auxiliary spring; 216. Locking block; 217. Push rod; 301. Cutting wheel; 302. Auxiliary motor; 303. Isolation plate; 304. Sliding plate; 305. Rocker; 306. Unlocking sleeve. Detailed Implementation

[0017] 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.

[0018] Example 1: Please refer to Figures 1-3 An engineering plastic granule extrusion and pelletizing device includes a frame 1. A plastic extrusion furnace 3 is fixedly installed on the upper end of the frame 1 by bolts. A water tank 4 is also fixedly installed on the upper end of the frame 1. The water tank 4 is located on one side of the plastic extrusion furnace 3. An extruder 101 is fixedly connected to the outer surface of the plastic extrusion furnace 3. The output end of the extruder 101 faces the water tank 4. Multiple nozzles 102 are fixedly installed inside the extruder 101. The molten engineering plastic inside the plastic extrusion furnace 3 is extruded through the extruder 101 to form a continuous plastic strip. The extruded plastic strip is guided by the nozzles 102 so that the plastic strip can stably enter the cooling water inside the water tank 4. Through the heat exchange effect of the cooling water in the water tank 4, the high-temperature plastic strip is quickly cooled and shaped, thereby improving the stability of the plastic strip during the conveying process and avoiding deformation or sticking of the plastic strip due to excessive temperature. A movable box 201 is slidably installed inside the water tank 4. The movable box 201 is used to support and guide the plastic strips entering the water tank 4, so that the plastic strips can move along a predetermined path and prevent the plastic strips from shifting or getting tangled during the cooling process. A pelletizing rack 5 is fixedly installed at the end of the water tank 4 away from the plastic extrusion furnace 3. A cutting wheel 301 is rotatably installed inside the pelletizing rack 5. Multiple blades are evenly fixedly installed on the outer surface of the cutting wheel 301. When the cooled engineering plastic strip moves to the pelletizing rack 5, the cutting wheel 301 is driven to rotate, so that the blades on the surface of the cutting wheel 301 contact the plastic strip in sequence, thereby cutting the continuous plastic strip into granular engineering plastic. At the same time, by adjusting the spacing between the blades on the surface of the cutting wheel 301, the cutting length of the plastic granules can be changed to meet the processing requirements of engineering plastic granules of different specifications. The upper end of the device frame 1 is fixedly mounted with a drive motor 22 by bolts. A steering shaft 2 is set below the plastic extrusion furnace 3. Tensioning wheels are fixedly mounted on both the steering shaft 2 and the output end of the drive motor 22. The two tensioning wheels are connected by a transmission belt 21, which allows the drive motor 22 to drive the steering shaft 2 to rotate through the transmission belt 21, thereby providing power to the plastic extrusion mechanism inside the plastic extrusion furnace 3. This enables the plastic extrusion furnace 3 to continuously complete the melting, conveying, and extrusion process of engineering plastics. Power transmission through the transmission belt 21 can achieve a stable connection between the drive motor 22 and the plastic extrusion furnace 3, ensuring the operational stability during the continuous extrusion process of engineering plastic strips.

[0019] like Figures 2-4 As shown, a guide plate 106 is fixedly installed inside the water tank 4. A rack 104 and a water level plate 105 are fixedly installed on the surface of the guide plate 106. The rack 104 is located above the water level plate 105. The movable box 201 is slidably installed inside the water tank 4, and a guide gear 202 is rotatably installed on the surface of the movable box 201. The guide gear 202 meshes with the rack 104, so that the movable box 201 can be limited and guided by the meshing relationship between the guide gear 202 and the rack 104 during the movement inside the water tank 4, thereby improving the stability of the movable box 201 during the movement. A float 203 is rotatably installed at the bottom of the movable box 201. The float 203 is located above the water level plate 105. Through the buoyancy between the float 203 and the cooling water inside the water tank 4, the movable box 201 can remain suspended and move along the inside of the water tank 4. Specifically, the cooling water level inside the water tank 4 is set higher than the water level plate 105, and the water level height is limited by the water level plate 105 so that the cooling water inside the water tank 4 can maintain a relatively stable water level. When the movable box 201 is subjected to the buoyancy provided by the float 203, the movable box 201 can maintain a stable floating state inside the water tank 4. Furthermore, under the meshing action of the rack 104 and the guide gear 202, the float 203 is always partially submerged. Multiple spray nozzles 107 are fixedly installed on the surface of the guide plate 106. A water pump (not shown in the figure) is installed inside the water tank 4. The water pump delivers cooling water to the spray nozzles 107, so that the spray nozzles 107 continuously output flowing water into the water tank 4 to improve the fluidity of the cooling water inside the water tank 4. When the movable box 201 is not restricted, the water flow acts on the movable box 201, causing the movable box 201 to move along the direction of the water flow. When the position of the movable box 201 is restricted, the water flow acts on the float 203, causing the float 203 to rotate. It is worth noting that several lifting beams 103 are fixedly installed inside the water tank 4. Each lifting beam 103 has a roller rotatably installed at its upper end. The lifting beams 103 are completely submerged in the cooling water inside the water tank 4 and are located below the movement path of the plastic strip. The lifting beams 103 support the plastic strip during the cooling process, so that the plastic strip can remain suspended in the cooling water and move in a predetermined direction. This prevents the plastic strip from sinking to the bottom of the water tank 4 due to its excessive length, which would cause friction or accumulation. At the same time, the rotation of the rollers reduces the resistance during the movement of the plastic strip and improves the smoothness of the plastic strip conveying process.

[0020] Example 2: Please refer to Figure 2 , Figure 5 An engineering plastic granule extrusion and pelletizing device, based on Embodiment 1, has multiple guide grooves 206 on the upper end of the movable box 201. These guide grooves 206 are respectively configured to correspond to the corresponding nozzles 102, allowing the plastic strips extruded from each nozzle 102 to enter and be guided within their respective guide grooves 206. A passive shaft 205 is rotatably mounted inside each guide groove 206. The passive shaft 205 is used to roll and contact the plastic strips, reducing frictional resistance during transport and ensuring the smooth flow of each plastic strip. The plastic strips are conveyed in a separated state to avoid tangling or knotting due to contact. In the initial state, multiple guide grooves 206 are located below the corresponding nozzles 102, so that the plastic strips extruded from the nozzles 102 can directly enter the guide grooves 206. A prismatic plate 204 is slidably installed on the upper end of the movable box 201. The plastic strips extruded from the nozzles 102 pass over the guide grooves 206 under the action of their own extrusion thrust and motion inertia, and move to the top of the prismatic plate 204 so that they can move synchronously with the movable box 201 in the future. Specifically, the surface of the prismatic plate 204 is roughened to increase the contact friction between the prismatic plate 204 and the plastic strip, so that the plastic strip can form a stable contact with the prismatic plate 204 in the early stage of cooling. This facilitates the synchronous traction of the plastic strip when the movable box 201 moves, guiding the plastic strip along the predetermined path to the cutting wheel 301 for pelletizing. At the same time, the passive shaft 205 remains rotating during the conveying of the plastic strip, reducing the frictional resistance between the plastic strip and the guide groove 206 through rolling contact, so that the plastic strip can be continuously and stably output, and ensuring that the movable box 201 will not be affected by the pulling of the plastic strip during the movement.

[0021] like Figures 5-7 Inside the active box 201, a guide plate 207 is fixedly installed. The guide plate 207 is located below the prismatic plate 204. Inside the active box 201, a drive gear 210 is rotatably installed. The drive gear 210 is fixedly connected to the guide gear 202, so that the drive gear 210 and the guide gear 202 can rotate synchronously. A rectangular hole is opened on the surface of the guide plate 207. The rectangular hole is inclined, and a balance shaft 214 is slidably installed inside the rectangular hole. A transmission gear 212 is fixedly installed at the front end of the balance shaft 214, and an output wheel 213 is fixedly installed at the rear end of the balance shaft 214. When the balance shaft 214 slides downward along the inclined rectangular hole, the transmission gear 212 meshes with the drive gear 210, and the output wheel 213 simultaneously rolls in contact with the outer surface of the float 203. When the float 203 rotates under the push of the water flow formed by the spray nozzle 107, the float 203 drives the balance shaft 214 to rotate synchronously through the output wheel 213. The balance shaft 214 further drives the transmission gear 212 to rotate, and drives the guide gear 202 to rotate synchronously through the meshing action between the transmission gear 212 and the drive gear 210. Since the guide gear 202 is meshed with the rack 104, during the rotation of the guide gear 202, the rotational motion of the guide gear 202 is converted into the linear movement of the movable box 201 along the rack 104, thereby driving the movable box 201 to move in the opposite direction to the water flow direction, returning to the output position of the strip extruder 101, thus realizing the automatic reset of the movable box 201, so as to receive and guide the newly extruded plastic strip again.

[0022] like Figures 7-10As shown, an isolation plate 303 is fixedly installed inside the pelletizing rack 5. A sliding plate 304 is slidably installed on the upper end of the isolation plate 303. When the movable box 201 moves to the pelletizing rack 5 and contacts the isolation plate 303, the upper surface of the sliding plate 304 is slightly higher than the upper surface of the prismatic plate 204. The edge of the sliding plate 304 near the prismatic plate 204 is set with a rounded corner transition structure so that the plastic strip on the prismatic plate 204 can smoothly transition to the upper surface of the sliding plate 304, reducing the obstruction of the plastic strip during the conveying process. The cutting wheel 301 is located between the prismatic plate 204 and the... Above the sliding plates 304, and with a gap maintained between the outer surface of the cutting wheel 301 and the prismatic plate 204, the plastic strip can be positioned between the cutting wheel 301 and the prismatic plate 204. When the cutting wheel 301 rotates, the blade on the surface of the cutting wheel 301 first contacts the plastic strip, and the rotation of the cutting wheel 301 drives the plastic strip to move towards the sliding plate 304. During the process of the plastic strip crossing the height difference between the prismatic plate 204 and the sliding plate 304, the blade on the surface of the cutting wheel 301 continuously cuts the plastic strip, thereby forming engineering plastic granules of uniform size. An auxiliary motor 302 is fixedly mounted on the surface of the pelletizing frame 5, and the output end of the auxiliary motor 302 is fixedly connected to the cutting wheel 301. As the cutting wheel 301 continuously drives the plastic strip to move towards the sliding plate 304, since the height of the sliding plate 304 is higher than that of the prism plate 204, the front end of the plastic strip first contacts the sliding plate 304 and continuously pushes the sliding plate 304 to slide away from the cutting wheel 301, so that the sliding plate 304 can be displaced under the pushing action of the plastic strip. A sealing sleeve 209 is fixedly installed on the surface of the active box 201. A push rod 217 is slidably installed inside the sealing sleeve 209. The push rod 217 and the sealing sleeve 209 are connected by an auxiliary spring 215. The auxiliary spring 215 is in a compressed state in the initial state and is used to provide a reset driving force for the push rod 217. A locking hole is opened on the surface of the sealing sleeve 209. A locking block 216 is fixedly installed on the end of the push rod 217 away from the balance shaft 214 through a spring plate. The locking block 216 passes through the locking hole and can cooperate with the locking hole to lock the push rod 217. A push plate 211 is fixedly installed on the end of the push rod 217 close to the balance shaft 214. The push plate 211 contacts the outer surface of the balance shaft 214. When the push rod 217 moves along the inside of the sealing sleeve 209, the push plate 211 simultaneously pushes the balance shaft 214 to move along the rectangular hole on the guide plate 207. Specifically, a lever 208 is fixedly installed at the bottom end of the prismatic plate 204. The lever 208 passes through the inside of the guide plate 207 and is located on the side of the balance shaft 214 away from the push plate 211. When the prismatic plate 204 moves with the movable box 201, the lever 208 can form a limiting fit with the balance shaft 214 to ensure that the balance shaft 214 moves stably along the rectangular hole. A rocker arm 305 is rotatably mounted on the bottom end of the isolation plate 303. A slot that mates with the rocker arm 305 is provided on the bottom end of the sliding plate 304. An unlocking sleeve 306 is slidably mounted on the bottom end of the isolation plate 303. One end of the rocker arm 305 is located inside the slot, and the other end is in contact with the unlocking sleeve 306. When the sliding plate 304 moves away from the cutting wheel 301, the side wall of the slot pushes the rocker arm 305 to rotate, causing the other end of the rocker arm 305 to push the unlocking sleeve 306 to move toward the movable box 201. As the unlocking sleeve 306 moves toward the movable box 201, it gradually fits onto the outer surface of the sealing sleeve 209 and eventually contacts the inclined surface on the outer side of the locking block 216. As the unlocking sleeve 306 continues to advance, the locking block 216 is squeezed by the inclined surface and retracts into the sealing sleeve 209, thereby releasing the locking state between the locking block 216 and the lock hole. At this time, the auxiliary spring 215 releases its elastic potential energy and pushes the push rod 217 to move rapidly along the inside of the sealing sleeve 209. The push plate 211 simultaneously pushes the balance shaft 214 to move along the rectangular hole, so that the transmission gear 212 and the drive gear 210 re-engage.

[0023] Example 3: Please refer to Figure 2 , Figure 11 An engineering plastic granule extrusion and pelletizing device, based on embodiments 1 and 2, has an auxiliary plate 110 fixedly installed on the right end of the prismatic plate 204, a nozzle 109 slidably installed inside the nozzle 102, the nozzle 109 being positioned corresponding to the auxiliary plate 110, a plug 111 fixedly installed inside the nozzle 102, and the nozzle 109 being connected to the nozzle 102 via a reset spring 108, which provides a reset spring force for the nozzle 109. In the initial state, the nozzle 109 is located inside the nozzle 102 and cooperates with the plug 111, so that the nozzle 102 is in a closed state. As the engineering plastic molten inside the plastic extrusion furnace 3 is continuously extruded, the internal pressure of the nozzle 102 gradually increases. Under the pressure of the engineering plastic, the nozzle 109 overcomes the elastic force of the reset spring 108 and moves out of the nozzle 102, causing the nozzle 109 to disengage from the sealing position of the plug 111. The engineering plastic is then extruded through the nozzle 109 to form a plastic strip. During the outward movement of the nozzle 109, the edge of the nozzle 109 contacts the auxiliary plate 110 and pushes the auxiliary plate 110 to move synchronously. The auxiliary plate 110 drives the prism plate 204 to slide along the upper end of the movable box 201, so that the prism plate 204 is reset synchronously. As the prism plate 204 moves, the lever 208 fixed at the bottom of the prism plate 204 moves synchronously and pushes the balance shaft 214 back to its initial position along the rectangular hole on the guide plate 207, causing the transmission gear 212 to disengage from the drive gear 210. At the same time, the balance shaft 214 releases its continuous action on the push plate 211. Driven by the push rod 217, the push plate 211 resets synchronously with the push rod 217. The locking block 216 is re-inserted into the lock hole on the surface of the sealing sleeve 209 and remains locked again under the action of the auxiliary spring 215, thus completing the reset of the transmission mechanism inside the movable box 201 and preparing for the next plastic strip conveying and pelletizing cycle. It is worth noting that the movement of nozzle 109 under the pressure inside nozzle 102 is an instantaneous action. Nozzle 109 only briefly contacts auxiliary plate 110 to complete the reset drive of prism plate 204. Since the overall mass of movable box 201 is large, and movable box 201 is always constrained by the buoyancy provided by float 203 and the meshing guidance between guide gear 202 and rack 104, the impact force of nozzle 109 popping out instantaneously is not enough to push movable box 201 to move as a whole. Therefore, the action of nozzle 109 only drives prism plate 204 to complete reset, and will not affect the positional stability of movable box 201 inside water tank 4.

[0024] The working principle of this invention is: During operation, the engineering plastic inside the plastic extrusion furnace 3 is heated and melted, and then continuously conveyed to the nozzle 102 under the action of internal extrusion pressure. As the internal pressure of the nozzle 102 gradually increases, the nozzle 109 overcomes the elastic force of the reset spring 108 and moves outward along the nozzle 102, causing the nozzle 109 to disengage from the sealing position of the plug 111. The molten engineering plastic is then extruded through the nozzle 109 to form a continuous plastic strip. During the outward movement of the nozzle 109, the edge of the nozzle 109 contacts the auxiliary plate 110 and pushes the auxiliary plate... The plate 110 moves synchronously, and the auxiliary plate 110 drives the prismatic plate 204 to slide along the upper end of the movable box 201, so that the prismatic plate 204 returns to its initial position. At the same time, the lever 208 at the bottom of the prismatic plate 204 pushes the balance shaft 214 to reset along the rectangular hole on the guide plate 207, so that the transmission gear 212 disengages from the drive gear 210. The push plate 211 resets synchronously with the push rod 217, and the locking block 216 is re-inserted into the lock hole on the surface of the sealing sleeve 209, thereby completing the reset of the internal transmission mechanism of the movable box 201. Subsequently, the plastic strips extruded by the nozzle 109 enter the corresponding guide grooves 206 in sequence, and move to the upper surface of the prism plate 204 after being guided by the passive shaft 205. Since the surface of the prism plate 204 is set with a rough structure, the end of the plastic strip first attaches to the surface of the prism plate 204. At the same time, the water spray nozzle 107 continuously sprays water into the water tank 4, keeping the cooling water in the water tank 4 in a flowing state. Under the driving force of the water flow, the movable box 201 moves along the water flow direction under the buoyancy support provided by the float 203, and drives the prism plate 204 and the plastic strip on it to move synchronously towards the cutting wheel 301. During the movement, the subsequent part of the plastic strip is always immersed in the cooling water inside the water tank 4. The cooling water continuously exchanges heat to complete the cooling and shaping, providing stable hardness and size for subsequent pellet cutting. When the active box 201 moves to below the cutting wheel 301, the cutting wheel 301 continues to rotate. The blades on its surface first come into contact with the plastic strip and drive the plastic strip to move towards the sliding plate 304. Since the upper surface of the sliding plate 304 is higher than the upper surface of the prism plate 204, the plastic strip crosses the height difference between the two and first comes into contact with the sliding plate 304, and continues to push the sliding plate 304 to slide away from the cutting wheel 301, causing the sliding plate 304 to be displaced. At the same time, the plastic strip is continuously cut under the action of the blades of the cutting wheel 301 to form engineering plastic granules. During the movement of the sliding plate 304, the rocker 305 is rotated by the slot. The rocker 305 further pushes the unlocking sleeve 306 to move towards the movable box 201. The unlocking sleeve 306 gradually fits onto the outer surface of the sealing sleeve 209 and finally contacts the inclined surface on the outside of the locking block 216. As the unlocking sleeve 306 continues to advance, the locking block 216 is squeezed by the inclined surface and retracts into the sealing sleeve 209, thereby releasing the locking state between the locking block 216 and the lock hole. At this time, the auxiliary spring 215 releases elastic potential energy and pushes the push rod 217 to move along the inside of the sealing sleeve 209. The push plate 211 simultaneously pushes the balance shaft 214 to move along the rectangular hole on the guide plate 207, so that the transmission gear 212 and the drive gear 210 re-enter the meshing state. At the same time, the output wheel 213 contacts the outer surface of the float wheel 203. As the spray nozzle 107 continuously outputs water into the water tank 4, the float 203 rotates continuously under the action of the water flow. The float 203 drives the balance shaft 214 to rotate through the output wheel 213. The balance shaft 214 further drives the transmission gear 212 to rotate, and drives the guide gear 202 to rotate synchronously through the drive gear 210. After the guide gear 202 meshes with the rack 104, it converts the rotational motion into the linear movement of the movable box 201 along the rack 104, thereby driving the movable box 201 to automatically reset in the direction close to the plastic extrusion furnace 3, so that the movable box 201 returns to the bottom of the nozzle 102 so as to receive the newly extruded plastic strips again. This realizes the continuous cycle operation of engineering plastic extrusion, cooling, pelletizing and resetting, and improves the continuity and automation of engineering plastic pellet production.

[0025] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An engineering plastic pellet extrusion and pelletizing device, comprising a frame, characterized in that: A plastic extrusion furnace is fixedly mounted on the upper end of the device frame by bolts. A water tank is also fixedly mounted on the upper end of the device frame. The water tank is located on one side of the plastic extrusion furnace. A strip extruder is fixedly connected to the outer surface of the plastic extrusion furnace. The output end of the strip extruder faces the water tank, and multiple nozzles are fixedly installed inside the strip extruder. The molten engineering plastic inside the plastic extrusion furnace is extruded through the strip extruder to form continuous plastic strips. A movable box is slidably installed inside the water tank. The movable box is used to support and guide the plastic strips entering the water tank. A pelletizing frame is fixedly mounted at the end of the water tank away from the plastic extrusion furnace. A cutting wheel is rotatably mounted inside the pelletizing frame. Multiple blades are evenly fixedly mounted on the outer surface of the cutting wheel. When the cooled engineering plastic strip moves to the pelletizing frame, the cutting wheel is driven to rotate, so that the blades on the surface of the cutting wheel contact the plastic strip in sequence, thereby cutting the continuous plastic strip into granular engineering plastic. An isolation plate is fixedly installed inside the pelletizing rack, and a sliding plate is slidably installed on the upper end of the isolation plate. The cutting wheel is located above the prism plate and the sliding plate, and a gap is maintained between the outer surface of the cutting wheel and the prism plate so that the plastic strip can be located between the cutting wheel and the prism plate. A sealing sleeve is fixedly installed on the surface of the active box, and a push rod is slidably installed inside the sealing sleeve. The push rod and the sealing sleeve are connected by an auxiliary spring. The auxiliary spring is in a compressed state in the initial state and is used to provide a reset driving force for the push rod. A lock hole is opened on the surface of the sealing sleeve. The end of the push rod away from the balance shaft is fixedly mounted with a locking block by a spring plate. The locking block passes through the lock hole and can cooperate with the lock hole to lock the push rod. The end of the push rod close to the balance shaft is fixedly mounted with a push plate. The push plate contacts the outer surface of the balance shaft. When the push rod moves along the inside of the sealing sleeve, the push plate simultaneously pushes the balance shaft to move along the rectangular hole on the guide plate. A rocker arm is rotatably mounted on the bottom end of the isolation plate. A slot is provided at the bottom end of the sliding plate to cooperate with the rocker arm. An unlocking sleeve is slidably mounted on the bottom end of the isolation plate. One end of the rocker arm is located inside the slot, and the other end is in contact with the unlocking sleeve. When the sliding plate moves away from the cutting wheel, the side wall of the slot pushes the rocker arm to rotate, causing the other end of the rocker arm to push the unlocking sleeve towards the movable box.

2. The engineering plastic granule extrusion and pelletizing device according to claim 1, characterized in that: A guide plate is fixedly installed inside the water tank. A rack and a water level plate are fixedly installed on the surface of the guide plate. The rack is located above the water level plate. The movable box is slidably installed inside the water tank. A guide gear is rotatably installed on the surface of the movable box. The guide gear meshes with the rack. A float is rotatably installed at the bottom of the movable box. The float is located above the water level plate. Through the buoyancy between the float and the cooling water inside the water tank, the movable box can remain suspended and move along the inside of the water tank.

3. The engineering plastic granule extrusion and pelletizing device according to claim 2, characterized in that: The upper end of the movable box is provided with multiple guide grooves, each of which is respectively set to correspond to a corresponding nozzle, so that the plastic strips extruded from each nozzle can enter the corresponding guide groove for guidance. A prism plate is slidably installed on the upper end of the movable box. The plastic strips extruded from the nozzles pass over the guide grooves under the action of their own extrusion thrust and motion inertia, and move to the top of the prism plate so that they can move synchronously with the movable box in the future.

4. The engineering plastic granule extrusion and pelletizing device according to claim 3, characterized in that: A guide plate is fixedly installed inside the movable box, and the guide plate is located below the prism plate. A drive gear is rotatably installed inside the movable box, and the drive gear is fixedly connected to the guide gear so that the drive gear and the guide gear can rotate synchronously.

5. The engineering plastic granule extrusion and pelletizing device according to claim 4, characterized in that: The guide plate has a rectangular hole on its surface. The rectangular hole is inclined and a balance shaft is slidably installed inside the rectangular hole. A transmission gear is fixedly installed at the front end of the balance shaft and an output wheel is fixedly installed at the rear end of the balance shaft.

6. The engineering plastic granule extrusion and pelletizing device according to claim 5, characterized in that: When the balance shaft slides downward along the inclined rectangular hole, the transmission gear and the drive gear mesh with each other, and the output wheel simultaneously rolls in contact with the outer surface of the float. When the float rotates under the push of the water flow formed by the spray nozzle, the float drives the balance shaft to rotate synchronously through the output wheel. The balance shaft further drives the transmission gear to rotate, and drives the guide gear to rotate synchronously through the meshing action between the transmission gear and the drive gear. Since the guide gear and the rack are kept meshed.

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