A pelletizing device for production of engineering plastics

Abstract

The present invention provides a pelletizing device for production of engineering plastics, and relates to the technical field of plastic pelletizing. The pelletizing device for production of engineering plastics comprises an extruder, a reduction box, a bevel gear set and a transmission crank, wherein the drive shaft on the reduction box of the extruder is connected to the reduction box, one end of the bevel gear set is connected to the output shaft of the reduction box, and the other end of the bevel gear set is connected to the center of the turntable of the transmission crank, and a multi-end synchronous pelletizer is connected to the output end of the extruder, and the multi-end synchronous pelletizer comprises a cooling box, and the cooling box comprises a tail feed disc and a discharge disc, wherein the tail feed disc and the discharge disc are fixedly connected, and a water storage chamber is provided between the tail feed disc and the discharge disc. The present invention solves the problem that the engineering plastics are adhered to the extrusion port due to rotary cutting, resulting in the plastics being unable to be extruded normally, and at the same time, the circulating water body and the high-pressure wind that can be excited at the moment of cutting are avoided, which causes the problem that the cut plastic particles are adhered to each other due to the high viscosity of the engineering plastics, and promotes the separation of the plastic particles from each other, thereby ensuring the uniformity and independence of the particles.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pelletizing, in particular to a pelletizing device for production of engineering plastics. Background Art

[0002] Engineering plastics are a type of polymer material with excellent properties and are widely used in many industrial fields. They usually have excellent mechanical properties, good heat resistance, chemical stability and dimensional stability. However, due to their complex molecular chain structure and strong intermolecular forces, the macromolecules of engineering plastics usually have a higher molecular weight and a more regular molecular arrangement, which increases the degree of entanglement and obstruction of the molecular chains during flow. At the same time, the molecular chains of engineering plastics may contain more polar groups or rigid structures, which makes it difficult for the molecules to move, and thus exhibits a higher melt viscosity.

[0003] When engineering plastics are extruded from the extruder, they are in the form of continuous strips. At this time, the high-speed rotating blade needs to rotate at a precise speed and angle to contact the extruded plastic strips. Under the action of strong rotational force, the blade quickly cuts through the plastic strips and cuts them into uniform particles. However, because the cutting is done by the rotation of the blade, its contact with the plastic is continuous and in a circular motion. This circular motion trajectory causes the blade to generate an outward centrifugal force when it contacts the plastic. This centrifugal force will throw part of the cut plastic to the inner wall of the extrusion port, causing the plastic to accumulate and stick there. Secondly, because the rotational cutting action is continuous, at the moment of cutting, the plastic is subjected to a force along the tangent direction of the blade. This force will make the plastic more easily dragged along the rotation direction of the blade while being cut, thereby increasing the chance of the plastic colliding and squeezing the inner wall of the extrusion port. Since engineering plastics have a high melt viscosity, the rotating cutting method will cause the plastic at the extrusion port to stick and the plastic cannot be discharged. In addition, since the blade rotates in a circle and the linear speed of the outer blade is higher than that of the inner blade, during the cutting process, the pressure and adhesion of the plastic on the outside will be significantly higher than that of the inner plastic, which will cause a significant difference in the quality of the plastics produced inside and outside, and cannot meet the high-precision plastic cutting standards. Therefore, the present invention provides a pelletizing device based on engineering plastic production to achieve the high-precision requirements required for engineering plastic cutting. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a pelletizing device for the production of engineering plastics, which solves the problem that the engineering plastics adhere to the extrusion port due to rotary cutting, resulting in the plastics being unable to be extruded normally. At the same time, the circulating water body and the high-pressure wind that can be stimulated at the moment of cutting are avoided, which avoids the problem of the cut plastic particles sticking to each other due to the high viscosity of the engineering plastics, promotes the separation of the plastic particles from each other, and ensures the uniformity and independence of the particles.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pelletizing device based on engineering plastic production, comprising an extruder, a reduction box, a bevel gear set and a transmission crank, the driving shaft on the reduction box of the extruder is connected to the reduction box, one end of the bevel gear set is connected to the output shaft of the reduction box, and the other end of the bevel gear set is connected to the center of the turntable of the transmission crank, and a multi-end synchronous pelletizer is connected to the output end of the extruder, and the multi-end synchronous pelletizer comprises a cooling box, and the cooling box comprises a rear feed disc and a discharge disc, and the rear feed disc is fixedly connected to the discharge disc, and a water storage cavity is opened between the rear feed disc and the discharge disc, and a transmission group is slidingly connected in a limited position in the discharge disc, and the transmission group comprises a driving piston, and a front side wall of the driving piston is provided with a water storage cavity. A water storage pipe is fixedly connected to the middle position of the water storage pipe, the front side wall of the water storage pipe is fixedly connected to a connector through a plurality of sliding rods, the connector is connected to a driving crank, an air disk group is fixedly connected to the outer side wall of the water storage pipe, the air disk group includes an air inlet disk, a cutting piston cylinder is installed at the middle position of the water storage pipe, and a cutting drive group is fixedly connected to the movable end of the cutting piston cylinder, the cutting drive group includes a cutting drive disk, the cutting drive disk is limitedly slidably connected to the inside of the air inlet disk, the front side wall of the cutting drive disk is fixedly connected to a connector through a plurality of sliding rods, and a plurality of cutting tube groups distributed in a circumferential array are fixedly connected to the rear side wall of the cutting drive disk, and the plurality of cutting tube groups are respectively arranged at one side of the discharge hole of the discharge disk and are parallel to the plurality of discharge holes;

[0006] The cutting tube group includes two fixed guide rails, two water-passing sliders, two bidirectional wedge-shaped drive frames and a plastic cutting tube. The two bidirectional wedge-shaped drive frames are fixedly connected to the rear side wall of the cutting drive disk, the two fixed guide rails are fixed on the drive piston, the two water-passing sliders are limitedly slidably connected to the front side wall of the fixed guide rails, and the bidirectional wedge-shaped drive frames are limitedly slidably connected to the outer side wall of the water-passing slider.

[0007] Preferably, the upper side wall on the left side and the lower side wall on the right side of the fixed guide rail piece are connected to energy storage spring frames through springs, and the middle position of the fixed guide rail piece is connected to two one-way wedge cuts through springs, and the limiting directions of the two one-way wedge cuts are opposite.

[0008] Preferably, a plastic feed pipe is fixedly connected between the tail feed tray and the discharge hole on the discharge tray, and a water circulation drive plug plate is fixedly connected to the rear side wall of the drive piston, and the water circulation drive plug plate is limitedly slidably connected to the outside of several plastic feed pipes.

[0009] Preferably, a cold water feed pipe is connected through the top of the rear side wall of the tail feed plate, and the cold water feed pipe is connected to the water storage chamber. The rear side wall of the water circulation drive plug plate is provided with a circulating water chamber matching the number of cutting tube groups, and a one-way valve is connected to the front side of each circulating water chamber.

[0010] Preferably, each one-way valve has an output end connected to a water inlet hose, the other end of which is connected to the right side wall of the adjacent water-passing slider, and several water-passing sliders close to the water storage and drainage pipe are connected to a drainage hose, which passes through the water storage and drainage pipe and is connected to the inside of the water storage and drainage pipe.

[0011] Preferably, an air inlet pipe is connected through the top of the front side wall of the air inlet disk, a plurality of air limiting pipes are fixedly connected to the rear side wall of the air inlet disk, and the plurality of air limiting pipes are directly opposite to the plurality of discharge holes on the front side of the discharge disk, and a plurality of air gushing pipes are fixedly connected to the front side wall of the cutting drive disk, and the plurality of air gushing pipes are limitedly and slidably connected inside the plurality of air limiting pipes.

[0012] Preferably, air flow holes are provided at both the front and rear ends of the air limiting pipe, and a protrusion is provided in the middle position of the inner wall of the air limiting pipe, the protrusion inside the air limiting pipe is tightly attached to the outer wall of the air gushing pipe inside it, and an air inlet hole matching the air flow hole on the air limiting pipe is provided on the top of the air gushing pipe.

[0013] The present invention has the following technical points and beneficial effects:

[0014] 1. Water flows through the plastic feed pipe to pre-cool the plastic in the plastic feed pipe, reducing the viscosity of the engineering plastic, avoiding adhesion during the cutting process, making it easier to separate during the cutting process, and making the cutting edge more neat. At the same time, it reduces the internal stress caused by uneven temperature inside the engineering plastic, enhances the structural stability of the product, and prolongs its service life. When the transmission group moves to the rear side, the water flow will flow into the circulating water cavity when it is squeezed, and flow into the water inlet hose through the one-way valve. As the volume of squeezed water increases, the water flow flows through the water inlet hose to the plastic cutting pipe, and finally flows from the drainage hose into the air gushing pipe for discharge. The circulating water can fully cool the plastic cutting pipe for cutting, so that the cutting tool can be effectively cooled within a cycle of cutting completion, avoiding excessive temperature of the plastic cutting pipe caused by cutting, thereby affecting the pelletizing quality of the engineering plastic.

[0015] 2. The cutting process is completed by the cutting piston cylinder pushing the cutting drive group and then driving the cutting tube group, and the cutting drive disk slides along the inner wall of the air inlet disk, and injects high-pressure airflow between the air inlet disk and the cutting drive disk through the air inlet pipe. There is a bulge in the middle of the tube wall of the air limiting tube. During the cutting process, the airflow will only be stored between the cutting drive disk and the air inlet disk and accumulate pressure as the volume of the injected gas increases. At the moment of cutting completion, that is, when the air gushing tube moves to the front or rear end of the air limiting tube, the airflow will instantly eject from the air holes of the air gushing tube, and the ejected high-pressure wind blows on the cut engineering plastic particles, which can quickly take away the heat on the surface of the plastic particles, achieve rapid cooling, help fix the shape of the plastic, and reduce thermal deformation. At the same time, the high-pressure wind can take away trace moisture on the surface of the plastic particles, separate the plastic particles from each other, avoid adhesion and agglomeration, and ensure the uniformity and independence of the particles.

[0016] 3. The cutting piston cylinder drives the connecting plate to extend and retract quickly. When the movable end of the cutting piston cylinder moves to the rear, the bidirectional wedge-shaped driving frame moves to the rear under the drive of the cutting driving plate. Under the extrusion of the bidirectional wedge-shaped driving frame, the water-passing slider is driven to move to the left, and the plastic cutting tube cuts the extruded plastic. Since the moving direction of the plastic cutting tube is always perpendicular to the plastic extrusion direction, the flatness of the cutting surface of the plastic particles is fully guaranteed. When the connecting plate moves, all cutting tube groups are triggered at the same time, which ensures that the length of the plastic particles produced in the same time period is equivalent. This cutting method uses the reciprocating sliding plastic cutting tube The cutting direction is always perpendicular to the extrusion direction, and there will be no outward force like rotary cutting, so the plastic is not easily pushed to the inner wall of the extrusion port, so that the cut plastic has more time to flow and adjust its position naturally during the extrusion process, reducing the possibility of being squeezed to the inner wall due to force at the moment of cutting, and because the reciprocating cutting trajectory is relatively simple and direct, the plastic does not have enough time and space to move in other directions when being cut, thereby reducing the chance of contact and extrusion with the inner wall of the extrusion port, and will not cause the plastic to stick to the inner wall of the extrusion port due to cutting, avoiding the situation where the engineering plastic sticks to the inner wall of the extrusion port and cannot be extruded normally.

[0017] 4. When the water-passing slider moves to the right, the energy-storage spring frame will be continuously squeezed until the water-passing slider moves to the top of the left unidirectional wedge-shaped cutter. At this time, the energy-storage spring frame in the energy-storage state will squeeze the water-passing slider to move downward quickly, thereby changing the contact point between the plastic cutting tube and the plastic. This can avoid long-term contact between the plastic cutting tube and the high-temperature plastic, which may cause the plastic cutting tube to twist and deform. This improves the service life of the plastic cutting tube and further ensures the quality of the cut plastic particles. When the cutting drive group moves forward, the rear side of the bidirectional wedge-shaped drive frame drives the water-passing slider to move to the right, so that the right side of the plastic cutting tube cuts the plastic particles. By replacing the contact surface, the possibility of damage to the plastic cutting tube caused by high temperature can also be reduced.

[0018] 5. In the reduction gear box of the extruder, the shaft connected to the reduction gear box cooperates with the shaft connected to the extrusion threaded rod. The shaft drives the transmission crank to rotate through the use of the reduction gear box and the bevel gear group. The turntable on the rotating transmission crank pushes the wedge-shaped slider connected to the connector to move back and forth periodically through the crank structure, thereby driving the transmission group to achieve reciprocating motion matching the extrusion speed. While the transmission group moves, it will drive the cutting tube group to move forward as a whole, so that the plastic cutting tube can move forward with the plastic material when cutting the extruded plastic material, making the cutting surface of the plastic smoother, greatly improving the quality of the cut plastic, and because the moving speed of the transmission group matches the plastic extrusion speed, it further ensures that the length of the cut plastic particles is highly uniform, greatly reducing the possibility of plastic particles of different lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of a multi-terminal synchronous pelletizer in the present invention;

[0021] Figure 3 It is a first top view of the multi-end synchronous pelletizer of the present invention;

[0022] Figure 4 for Figure 3 Sectional view along AA;

[0023] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0024] Figure 6 It is a schematic diagram of the multi-end synchronous pelletizer of the present invention after the cutting drive disk, the wind disk group and the transmission group are hidden;

[0025] Figure 7 It is a schematic diagram of the front side of the cutting tube assembly in the present invention;

[0026] Figure 8 It is a schematic diagram of the rear side of the cutting tube assembly in the present invention;

[0027] Fig. 9 A second top view of the multi-end synchronous pelletizer of the present invention;

[0028] Fig.10 for Fig. 9 Isometric section view along CC;

[0029] Fig.11 It is a cross-sectional view of the multi-end synchronous pelletizer in the present invention.

[0030] Among them, 1. Extruder; 2. Speed ​​reducer; 3. Bevel gear set; 4. Multi-end synchronous pelletizer; 5. Drive crank;

[0031] 41. Cooling box; 42. Wind disk group; 43. Cutting drive group; 44. Cutting tube group; 45. Transmission group; 46. Cutting piston cylinder;

[0032] 411, tail feed tray; 412, cold water feed pipe; 413, water storage chamber; 414, plastic feed pipe; 415, discharge tray; 416, one-way valve; 417, circulating water chamber;

[0033] 421, air inlet plate; 422, air inlet pipe; 423, air limiting pipe;

[0034] 431, cutting drive disc; 432, connecting disc; 433, air gushing pipe;

[0035] 441, fixed guide rail; 442, water-passing slider; 443, two-way wedge-shaped drive frame; 444, water inlet hose; 445, drainage hose; 446, energy storage spring frame; 447, one-way wedge-shaped cut; 448, plastic cutting tube;

[0036] 451. driving piston; 452. water circulation driving plug plate; 453. water storage and drainage pipe; 454. connector. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Fig.11As shown, the embodiment of the present invention provides a pelletizing device for engineering plastic production, including an extruder 1, a reduction box 2, a bevel gear set 3 and a transmission crank 5. The driving shaft on the reduction box of the extruder 1 is connected to the reduction box 2, one end of the bevel gear set 3 is connected to the output shaft of the reduction box 2, and the other end of the bevel gear set 3 is connected to the center of the turntable of the transmission crank 5. The shaft connected to the reduction box 2 in the reduction box of the extruder 1 cooperates with the shaft connected to the extrusion threaded rod. The shaft drives the transmission crank 5 to rotate through the use of the reduction box 2 and the bevel gear set 3. The turntable on the rotating transmission crank 5 drives the wedge-shaped slider connected to the connector 454 to periodically reciprocate through the crank structure, thereby driving the transmission group 45 to achieve reciprocating motion matching the extrusion speed. A multi-end synchronous pelletizer 4 is connected to the output end of the extruder 1. The multi-end synchronous pelletizer 4 includes a cooling box 41, and the cooling box 41 includes a tail feed tray 411 and a discharge tray 4 15. The rear feed disc 411 is fixedly connected to the discharge disc 415, and a water storage chamber 413 is opened between the rear feed disc 411 and the discharge disc 415. A transmission group 45 is slidably connected in a limited position in the discharge disc 415. The transmission group 45 includes a driving piston 451. A water storage pipe 453 is fixedly connected to the middle position of the front side wall of the driving piston 451. The front side wall of the water storage pipe 453 is fixedly connected to a connector 454 through a plurality of sliding rods. When the transmission group 45 moves, the cutting pipe group 44 is driven to move forward as a whole, so that the plastic cutting pipe 448 can move forward with the plastic material when cutting the extruded plastic material, so that the cutting surface of the plastic is smoother, which greatly improves the quality of the cut plastic. Moreover, since the moving speed of the transmission group 45 matches the plastic extrusion speed, it further ensures that the length of the cut plastic particles is highly uniform, which greatly reduces the possibility of the existence of plastic particles of different lengths.

[0039] like Figure 6 , Figure 7 and Figure 8As shown, the connector 454 is connected to the driving crank 5, and the outer wall of the water storage and drainage pipe 453 is fixedly connected with a wind disk group 42, the wind disk group 42 includes an air inlet disk 421, and a cutting piston cylinder 46 is installed in the middle position of the water storage and drainage pipe 453, and a cutting drive group 43 is fixedly connected to the movable end of the cutting piston cylinder 46, and the cutting drive group 43 includes a cutting drive disk 431, and the cutting drive disk 431 is limitedly slidably connected to the inside of the air inlet disk 421, and the front side wall of the cutting drive disk 431 is fixedly connected with a connector plate 432 through a plurality of sliding rods, and a plurality of cutting tube groups 44 distributed in a circumferential array are fixedly connected to the rear side wall of the cutting drive disk 431, and the plurality of cutting tube groups 44 are respectively arranged on one side of the discharge hole of the discharge disk 415, and are parallel to the plurality of discharge holes, and the connector plate 432 is driven to quickly retract and retract through the cutting piston cylinder 46, and the cutting piston cylinder 4 When the movable end of 6 moves backward, the two-way wedge-shaped driving frame 443 moves backward under the drive of the cutting driving disk 431, and under the extrusion of the movement of the two-way wedge-shaped driving frame 443, the water-passing slider 442 is driven to move to the left, and the plastic cutting tube 448 will cut the extruded plastic. Since the moving direction of the plastic cutting tube 448 is always perpendicular to the plastic extrusion direction, the flatness of the cut surface of the plastic particles is fully guaranteed, and when the connecting disk 432 moves, all the cutting tube groups 44 are triggered at the same time, which ensures that the lengths of the plastic particles produced in the same time period are equivalent, and the reciprocating cutting trajectory is relatively simple and direct, which reduces the chance of contact and extrusion with the inner wall of the extrusion port, and will not cause the plastic to adhere to the inner wall of the extrusion port due to cutting, thereby avoiding the situation where the engineering plastic adheres to the inner wall of the extrusion port and cannot be extruded normally.

[0040] like Figure 6 , Figure 7 and Figure 8As shown, the cutting tube group 44 includes two fixed guide rails 441, two water-passing sliders 442, two bidirectional wedge-shaped drive frames 443 and a plastic cutting tube 448. The two bidirectional wedge-shaped drive frames 443 are fixedly connected to the rear side wall of the cutting drive disk 431, the two fixed guide rails 441 are fixed on the drive piston 451, the two water-passing sliders 442 are limitedly slidably connected to the front side wall of the fixed guide rails 441, and the bidirectional wedge-shaped drive frames 443 are limitedly slidably connected to the outer side wall of the water-passing slider 442. The upper side wall of the fixed guide rail 441 on the left side and the lower side wall on the right side are both connected to energy storage spring frames 446 through springs. The middle position of the fixed guide rail 441 is connected to two unidirectional wedge-shaped cutters 447 through springs. The limiting directions of the two unidirectional wedge-shaped cutters 447 are opposite. In the process of the water-passing slider 442 moving to the right, the energy storage spring frame 446 will be continuously squeezed until the water-passing slider 442 moves to the left unidirectional wedge. 448 and the like.

[0041] Embodiment 2, as Figure 4 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11As shown, this embodiment provides another implementation method based on the first embodiment, a plastic feed pipe 414 is fixedly connected between the tail feed disc 411 and the discharge hole on the discharge disc 415, a water circulation drive plug plate 452 is fixedly connected to the rear side wall of the driving piston 451, and the water circulation drive plug plate 452 is limitedly slidably connected to the outside of the plurality of plastic feed pipes 414, a cold water feed pipe 412 is connected through the top of the rear side wall of the tail feed disc 411, and the cold water feed pipe 412 is connected to the water storage chamber 413, and the rear side wall of the water circulation drive plug plate 452 is provided with a plurality of cutting The pipe group 44 has a number of circulating water chambers 417 that match the number of the pipe groups 44, and a one-way valve 416 is connected to the front side of each circulating water chamber 417, and the output end of each one-way valve 416 is connected to a water inlet hose 444, and the other end of the water inlet hose 444 is connected to the right side wall of the adjacent water-passing slider 442, and a plurality of water-passing sliders 442 near the water storage and drainage pipe 453 are connected to a drainage hose 445, and the drainage hose 445 penetrates the water storage and drainage pipe 453 and is connected to the inside of the water storage and drainage pipe 453. When the transmission group 45 moves to the front side, the water originally on the outside flows into the water storage and drainage pipe 453. The water flows into the water storage chamber 413, and when the water flows through the plastic feed pipe 414, the plastic in the plastic feed pipe 414 can be pre-cooled, thereby reducing the viscosity of the engineering plastic, avoiding adhesion during the cutting process, making it easier to separate during the cutting process, and making the cutting edge more neat. At the same time, the internal stress caused by uneven temperature inside the engineering plastic is reduced, thereby enhancing the structural stability of the product and extending its service life. When the transmission group 45 moves to the rear side, the valve connected to the top of the cold water feed pipe 412 is closed, and the water flow cannot be pushed back to the pipeline above the cold water feed pipe 412. At this time, When squeezed, the water will flow into the circulating water chamber 417 and flow into the water inlet hose 444 through the one-way valve 416. As the volume of squeezed water increases, the water will flow into the plastic cutting tube 448 through the water inlet hose 444 and finally flow into the air gushing pipe 433 from the drainage hose 445 for discharge. The plastic cutting tube 448 being cut can be fully cooled by the circulating water, so that the cutting tool can be effectively cooled within one cutting cycle to avoid excessive temperature of the plastic cutting tube 448 caused by cutting, thereby affecting the pelletizing quality of the engineering plastics.

[0042] like Figure 3 , Figure 4 and Figure 5As shown, an air inlet pipe 422 is connected to the top of the front side wall of the air inlet disk 421, and a plurality of air limiting pipes 423 are fixedly connected to the rear side wall of the air inlet disk 421. The plurality of air limiting pipes 423 are directly opposite to the plurality of discharge holes on the front side of the discharge disk 415, and a plurality of air gushing pipes 433 are fixedly connected to the front side wall of the cutting drive disk 431. The plurality of air gushing pipes 433 are limitedly slidably connected to the interior of the plurality of air limiting pipes 423. The front and rear ends of the air limiting pipes 423 are provided with air flow holes, and the air limiting pipes 423 are provided with air flow holes. A convex block is arranged in the middle of the side wall, and the convex block inside the air limiting pipe 423 is closely attached to the outer wall of the air gushing pipe 433 inside it. The top of the air gushing pipe 433 is provided with an air inlet hole matching the air flow hole on the air limiting pipe 423. During the cutting process, the cutting piston cylinder 46 pushes the cutting drive group 43 and then drives the cutting pipe group 44. The cutting drive disk 431 slides along the inner wall of the air inlet disk 421, and high pressure is injected between the air inlet disk 421 and the cutting drive disk 431 through the air inlet pipe 422. The airflow is stored only between the cutting drive disk 431 and the air inlet disk 421 and is accumulated as the volume of the injected gas increases. At the moment of cutting, when the airflow tube 433 moves to the front end or the rear end of the air limiting tube 423, the airflow is instantly ejected from the air holes of the airflow tube 433. The ejected high-pressure wind blows on the cut engineering plastic particles, which can quickly take away the heat on the surface of the plastic particles, realize rapid cooling, help fix the shape of the plastic, and reduce thermal deformation. At the same time, the high-pressure wind can take away the trace moisture on the surface of the plastic particles, separate the plastic particles from each other, avoid adhesion and agglomeration, and ensure the uniformity and independence of the particles.

[0043] Working principle:

[0044] The cutting piston cylinder 46 drives the connecting plate 432 to extend and retract quickly. When the movable end of the cutting piston cylinder 46 moves backward, the bidirectional wedge-shaped driving frame 443 moves backward under the drive of the cutting driving plate 431. Under the extrusion of the bidirectional wedge-shaped driving frame 443, the water-passing slider 442 is driven to move to the left, and the plastic cutting tube 448 cuts the extruded plastic. Since the moving direction of the plastic cutting tube 448 is always perpendicular to the plastic extrusion direction, the flatness of the cutting surface of the plastic particles is fully guaranteed. When the connecting plate 432 moves, all the cutting tube groups 44 are triggered at the same time, which ensures that the lengths of the plastic particles produced in the same time period are equivalent. This cutting method uses the reciprocating sliding plastic cutting tube 44 8 is realized, and the cutting direction is always perpendicular to the extrusion direction. There will be no outward force like rotary cutting, so the plastic is not easily pushed to the inner wall of the extrusion port, so that the cut plastic has more time to flow and adjust its position naturally during the extrusion process, reducing the possibility of being squeezed to the inner wall due to force at the moment of cutting, and because the reciprocating cutting trajectory is relatively simple and direct, the plastic does not have enough time and space to move in other directions when being cut, thereby reducing the chance of contact and squeezing with the inner wall of the extrusion port, and will not cause the plastic to adhere to the inner wall of the extrusion port due to cutting, avoiding the situation where the engineering plastic adheres to the inner wall of the extrusion port and cannot be extruded normally, and the linear speeds of the inner and outer sides of the plastic cutting tube 448 are consistent, that is, the plastic produced on the inner and outer sides are The quality is consistent, and the produced engineering plastic particles will not have a large difference. At the same time, when the water-passing slider 442 moves to the right, the energy-storage spring frame 446 will be continuously squeezed until the water-passing slider 442 moves to the top of the left one-way wedge-shaped cut 447. At this time, the energy-storage spring frame 446 in the energy-storage state will squeeze the water-passing slider 442 to move downward quickly, thereby changing the contact point between the plastic cutting tube 448 and the plastic, which can avoid long-term contact between the plastic cutting tube 448 and the high-temperature plastic, resulting in the distortion of the plastic cutting tube 448, while improving the service life of the plastic cutting tube 448, and further ensuring the quality of the cut plastic particles. When the cutting drive group 43 moves forward, the rear side of the two-way wedge-shaped drive frame 443 The water-passing slider 442 is driven to move to the right side, so that the right side of the plastic cutting tube 448 cuts the plastic particles. By replacing the contact surface, the possibility of damage to the plastic cutting tube 448 caused by high temperature can also be reduced. When the water-passing slider 442 moves, it squeezes the energy storage spring frame 446 on the lower side, and when it comes to the right side of the one-way wedge cut 447, it is pushed to reset by the energy storage spring frame 446. In the reduction gear box of the extruder 1, the shaft connected to the reduction gear box 2 is matched with the shaft connected to the extrusion threaded rod. The shaft drives the transmission crank 5 to rotate through the use of the reduction gear box 2 and the bevel gear set 3. The rotating disk on the rotating transmission crank 5 drives the wedge-shaped slider connected to the connector 454 to move back and forth periodically through the crank structure.Thus, the transmission group 45 is driven to realize reciprocating motion matching the extrusion speed. When the transmission group 45 moves, the cutting tube group 44 is driven to move forward as a whole, so that the plastic cutting tube 448 can move forward together with the plastic material when cutting the extruded plastic material, making the cutting surface of the plastic smoother, greatly improving the quality of the cut plastic, and because the moving speed of the transmission group 45 matches the plastic extrusion speed, it further ensures that the length of the cut plastic particles is highly uniform, greatly reducing the possibility of the existence of plastic particles of different lengths.

[0045] When the transmission group 45 moves forward, the water originally on the outside enters the water storage chamber 413, and when the water flows through the plastic feed pipe 414, the plastic in the plastic feed pipe 414 can be pre-cooled, reducing the viscosity of the engineering plastic, avoiding adhesion during the cutting process, making it easier to separate during the cutting process, and making the cutting edge more neat. At the same time, the internal stress caused by uneven temperature inside the engineering plastic is reduced, the structural stability of the product is enhanced, and the service life is extended. When the transmission group 45 moves backward, the valve connected to the top of the cold water feed pipe 412 is closed, and the water cannot be pushed back to the cold water feed pipe In the pipeline above 412, the water will flow toward the circulating water chamber 417 when being squeezed, and flow into the water inlet hose 444 through the one-way valve 416. As the volume of squeezed water increases, the water flows through the water inlet hose 444 to the plastic cutting tube 448, and finally flows into the air gushing pipe 433 from the drain hose 445 for discharge. The plastic cutting tube 448 being cut can be fully cooled by the circulating water, so that the cutting tool can be effectively cooled within one cycle of cutting, thereby avoiding the plastic cutting tube 448 from being overheated due to cutting, thereby affecting the pelletizing quality of the engineering plastic.

[0046] The cutting process is completed by the cutting piston cylinder 46 pushing the cutting drive group 43 and then driving the cutting tube group 44, and the cutting drive disk 431 slides along the inner wall of the air inlet disk 421, and injects high-pressure air into the space between the air inlet disk 421 and the cutting drive disk 431 through the air inlet pipe 422, and there is a protrusion in the middle of the tube wall of the air limiting tube 423, which means that when the air gushing pipe 433 slides inside the air limiting tube 423, the air flow cannot be ejected from the air gushing pipe 433 through the air hole, and the air gushing pipe 433 can only be ejected from the air gushing pipe 433 when it slides to the front end or rear end of the air limiting tube 423, that is, during the cutting process, the air flow will only be ejected between the cutting drive disk 431 and the air inlet pipe 422. The gas is stored between the disks 421 and accumulated as the volume of the injected gas increases. At the moment of cutting completion, that is, when the air duct 433 moves to the front end or rear end of the air limiting duct 423, the air flow will instantly eject from the air holes of the air duct 433. The ejected high-pressure wind blows on the cut engineering plastic particles, which can quickly take away the heat on the surface of the plastic particles, achieve rapid cooling, help fix the shape of the plastic, and reduce thermal deformation. At the same time, the high-pressure wind can take away trace moisture on the surface of the plastic particles, separate the plastic particles from each other, avoid adhesion and agglomeration, and ensure the uniformity and independence of the particles. The high-pressure wind is only activated at the moment of cutting completion to avoid the disturbance of the air flow to the cutting process.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pelletizing device for production of engineering plastics, comprising an extruder (1), a reduction box (2), a bevel gear set (3) and a transmission crank (5), wherein a drive shaft on the reduction box of the extruder (1) is connected to the reduction box (2), one end of the bevel gear set (3) is connected to the output shaft of the reduction box (2), and the other end of the bevel gear set (3) is connected to the center of the turntable of the transmission crank (5), characterized in that: The output end of the extruder (1) is connected to a multi-end synchronous pelletizer (4), the multi-end synchronous pelletizer (4) comprising a cooling box (41), the cooling box (41) comprising a rear feed disc (411) and a discharge disc (415), the rear feed disc (411) and the discharge disc (415) being fixedly connected, and a water storage chamber (413) is provided between the rear feed disc (411) and the discharge disc (415), a transmission group (45) is slidably connected in a limited position in the discharge disc (415), the transmission group (45) comprising a driving piston (451), a water storage pipe (453) is fixedly connected to the middle position of the front side wall of the driving piston (451), a connector (454) is fixedly connected to the front side wall of the water storage pipe (453) via a plurality of sliding rods, the connector (454) is connected to the driving crank (5), the water storage pipe (453) is fixedly connected to the front side wall of the water storage pipe (453) via a plurality of sliding rods, the connector (454) is connected to the driving crank (5), the water storage pipe (453) is fixedly connected to the front side wall of the water storage pipe (453), and the connector (454) is connected to the driving crank (5). An air disk group (42) is fixedly connected to the outer wall of the discharge pipe (453), the air disk group (42) comprising an air inlet disk (421), a cutting piston cylinder (46) is installed in the middle of the water storage discharge pipe (453), and a cutting drive group (43) is fixedly connected to the movable end of the cutting piston cylinder (46), the cutting drive group (43) comprising a cutting drive disk (431), the cutting drive disk (431) is limitedly slidably connected to the inside of the air inlet disk (421), the front side wall of the cutting drive disk (431) is fixedly connected to a connecting disk (432) via a plurality of sliding rods, and a plurality of cutting tube groups (44) distributed in a circumferential array are fixedly connected to the rear side wall of the cutting drive disk (431), and the plurality of cutting tube groups (44) are respectively arranged at one side of the discharge hole of the discharge disk (415) and are parallel to the plurality of discharge holes; The cutting tube assembly (44) comprises two fixed guide rails (441), two water-passing sliders (442), two bidirectional wedge-shaped drive frames (443) and a plastic cutting tube (448); the two bidirectional wedge-shaped drive frames (443) are fixedly connected to the rear side wall of the cutting drive disk (431); the two fixed guide rails (441) are fixed to the drive piston (451); the two water-passing sliders (442) are limitedly slidably connected to the front side wall of the fixed guide rails (441); and the bidirectional wedge-shaped drive frames (443) are limitedly slidably connected to the outer side wall of the water-passing sliders (442); The upper side wall of the fixed guide rail piece (441) is connected to an energy storage spring frame (446) at the left side thereof and the lower side wall at the right side thereof via a spring, and the middle position of the fixed guide rail piece (441) is connected to two one-way wedge-shaped cuts (447) via a spring, and the two one-way wedge-shaped cuts (447) have opposite travel limiting directions; A plastic feed pipe (414) is fixedly connected between the tail feed tray (411) and the discharge hole on the discharge tray (415), and a water circulation drive plug plate (452) is fixedly connected to the rear side wall of the drive piston (451). The water circulation drive plug plate (452) is limitedly slidably connected to the outside of a plurality of plastic feed pipes (414).

2. A pelletizing device for production of engineering plastics according to claim 1, characterized in that: A cold water feed pipe (412) is connected through the top of the rear side wall of the tail feed tray (411), and the cold water feed pipe (412) is in communication with the water storage chamber (413). The rear side wall of the water circulation drive plug plate (452) is provided with circulating water chambers (417) matching the number of cutting tube groups (44), and a one-way valve (416) is connected to the front side of each circulating water chamber (417).

3. A pelletizing device for production of engineering plastics according to claim 2, characterized in that: The output end of each one-way valve (416) is connected to a water inlet hose (444), and the other end of the water inlet hose (444) is connected to the right side wall of the adjacent water-passing slider (442), while a plurality of water-passing sliders (442) close to the water storage and drainage pipe (453) are connected to a drainage hose (445), and the drainage hose (445) passes through the water storage and drainage pipe (453) and is in communication with the interior of the water storage and drainage pipe (453).

4. A pelletizing device for production of engineering plastics according to claim 1, characterized in that: An air inlet pipe (422) is connected through the top of the front side wall of the air inlet disk (421); a plurality of air limiting pipes (423) are fixedly connected to the rear side wall of the air inlet disk (421); the plurality of air limiting pipes (423) are directly opposite to the plurality of discharge holes on the front side of the discharge disk (415); and a plurality of air gushing pipes (433) are fixedly connected to the front side wall of the cutting drive disk (431); the plurality of air gushing pipes (433) are limitedly slidably connected inside the plurality of air limiting pipes (423).

5. A pelletizing device for production of engineering plastics according to claim 4, characterized in that: The front and rear ends of the air limiting pipe (423) are both provided with air flow holes, and a protrusion is provided at the middle position of the inner wall of the air limiting pipe (423), the protrusion inside the air limiting pipe (423) is tightly attached to the outer wall of the air gushing pipe (433) inside the air limiting pipe (423), and the top of the air gushing pipe (433) is provided with an air inlet hole matching the air flow hole on the air limiting pipe (423).

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