Waste plastic recycling and granulating equipment

Abstract

The invention relates to the technical field of plastic recovery, in particular to waste plastic recovery granulation equipment which comprises a screw extruder, a mounting cover is fixedly mounted at the right end of the screw extruder, discharge ports are formed in the positions, corresponding to die orifices of the screw extruder, of the right end of the mounting cover, and a guide unit is mounted in the mounting cover; a pre-cooling unit is mounted at the right end of the screw extruder and is positioned in the mounting cover; the plastic strip pre-cooling forming device is used for recycling waste plastic, extruded plastic strips in a molten state can be uniformly pre-cooled and formed, the problems that the plastic strips crack or plastic particles obtained after particle cutting are irregular in shape and the like are solved, the quality of the produced plastic particles is ensured, and the production efficiency is improved. And meanwhile, extruded plastic strips in a molten state can be guided, drooping deformation of the plastic strips under the action of gravity is prevented, the sizes of the plastic strips in the axial direction are consistent, and then it is guaranteed that the sizes of plastic particles produced subsequently are uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic recycling, and specifically to a waste plastic recycling and pelletizing device. Background Art

[0002] The recycling and utilization of waste plastics is an important means to reduce environmental pollution and resource waste. When recycling and utilizing waste plastics, plastic pellets are usually made by operations such as crushing, cleaning, melting and extruding, cooling, and pelletizing the waste plastics. Currently, when recycling and pelletizing waste plastics, the recycled waste plastics are usually melted and extruded into plastic strips by a screw extruder, and then directly pelletized by a pelletizer or the molten plastic strips are passed into water for cooling and shaping, and then the cooled plastic strips are pelletized by a pelletizer, thereby making the recycled waste plastics into plastic pellets.

[0003] The following problems exist in the current recycling and pelletizing of waste plastics: 1. Since the temperature of the just-extruded plastic strips is too high and in a molten state, when directly pelletizing with a pelletizer, the shape of the plastic pellets may be irregular, or when the plastic strips are passed into water, there is a huge temperature difference between the plastic strips and the water, so there may be problems such as the plastic strips cannot be evenly cooled, resulting in cracks on their surfaces, and further reducing the quality of the produced plastic pellets; 2. Since the just-extruded plastic strips are in a molten state and have a certain fluidity, the molten plastic strips may sag and deform under the action of gravity, resulting in inconsistent dimensions of the cooled plastic strips along their axes, and further resulting in uneven sizes of the subsequent produced plastic pellets. Summary of the Invention

[0004] To solve the above technical problems, the present invention adopts the following technical solutions. A waste plastic recycling and pelletizing device includes a screw extruder. An installation cover is fixedly installed at the right end of the screw extruder. Discharge ports are provided at the right end of the installation cover corresponding to the die openings of the screw extruder. A guiding unit is installed inside the installation cover, and a pre-cooling unit is installed at the right end of the screw extruder and inside the installation cover. The guiding unit includes an air inlet member installed inside the installation cover. A plurality of cylinders are installed on the air inlet member and are circumferentially and uniformly arranged. The cylinder wall of the cylinder is of a hollow structure. The air inlet member is used to introduce air into the hollow structure of the cylinder. A linear adjusting member is connected between the air inlet member and the installation cover. The linear adjusting member is used to adjust the left and right positions of the air inlet member. A plurality of square ventilation cylinders are radially slidably installed inside the cylinder and are circumferentially and uniformly arranged. Guide rods are fixedly installed on the opposite sides of the plurality of square ventilation cylinders. Flared air outlets are provided on the opposite sides of the plurality of guide rods. The air outlets are communicated with the hollow structure of the cylinder through the square ventilation cylinders. The pre-cooling unit includes a fixed cylinder fixedly installed at the right end of the screw extruder. An annular shunt cylinder is fixedly installed on the left inner wall of the fixed cylinder and is connected to the air inlet member. A plurality of blow pipes are installed on the outer side of the shunt cylinder through corrugated hoses and are circumferentially and uniformly arranged. One end of the blow pipe away from the shunt cylinder slidably penetrates through the fixed cylinder. A cooperating member is installed among the plurality of blow pipes. The cooperating member is used to drive the blow pipes to reciprocate left and right and circumferentially swing.

[0005] Preferably, the air inlet member includes a sliding ring slidably installed left and right inside the installation cover. The sliding ring is of a hollow structure. The right end of the sliding ring is connected to the installation cover through a plurality of circumferentially and uniformly arranged top extension springs. The inner side of the sliding ring is connected to the cylinder through a square connecting cylinder. The hollow structure of the sliding ring is communicated with the hollow structure of the cylinder through the square connecting cylinder.

[0006] Preferably, a telescopic pipe is installed at the lower left side of the sliding ring. The left end of the telescopic pipe is connected to the right end of the horizontal section of a T-shaped three-way air pipe joint fixedly installed on the installation cover. The upper end of the vertical section of the three-way air pipe joint is fixedly installed with an air inlet branch pipe. The upper end of the air inlet branch pipe penetrates through the fixed cylinder and is connected to the shunt cylinder.

[0007] Preferably, the linear adjusting member includes a linear adjusting plate fixedly installed on the upper part of the sliding ring. The upper end of the linear adjusting plate is of an elastic telescopic structure and slidably penetrates through the installation cover left and right. Right-angle locking rods are fixedly installed at the front and rear ends on the upper side of the linear adjusting plate.

[0008] Preferably, two locking grooves are symmetrically arranged front and rear on the upper left side of the installation cover. The right-angle locking rods are used to cooperate with the locking grooves to lock the left extreme position of the sliding ring.

[0009] Preferably, the fitting member includes a transmission ring distributed on the left side inside the fixed cylinder. The right end of the transmission ring is fixedly connected to the right inner wall of the fixed cylinder through a plurality of reset spring rods arranged circumferentially and evenly. A plurality of fitting rods arranged circumferentially and evenly are fixedly installed inside the transmission ring.

[0010] Preferably, transmission plates are fixedly installed at positions corresponding to the air blowing pipes at the left end of the transmission ring. Square holes are formed on the left sides of the transmission plates. The lower ends of the air blowing pipes are rotatably installed in the square holes of the corresponding transmission plates.

[0011] Preferably, a transmission shaft is fixedly installed at the right end of the rotating shaft of the screw of the screw extruder. The right end of the transmission shaft sequentially rotates through the right end of the screw extruder and the left end of the fixed cylinder and passes through the middle of the flow dividing cylinder. Two right-angle toggle plates arranged centrally symmetrically are fixedly installed on the outer side of the right end of the transmission shaft. The right ends of the horizontal sections of the right-angle toggle plates are both provided with inclined surfaces that cooperate with the fitting rods.

[0012] Preferably, waveform holes are formed at positions corresponding to the air blowing pipes on the outer side of the fixed cylinder, and the air blowing pipes are slidably arranged in the corresponding waveform holes.

[0013] Preferably, a plurality of groups of air dispersion hole groups arranged evenly left and right are formed on the outer side of the installation cover. Each group of air dispersion hole groups includes a plurality of air dispersion holes arranged circumferentially and evenly.

[0014] The beneficial effects of the present invention are as follows: 1. By setting the positions of the plurality of air blowing pipes to correspond one by one with the plastic strips, the present invention enables air to quickly pre-cool and shape the just-extruded molten plastic strips through the air blowing pipes. At the same time, the present invention drives the air blowing pipes to reciprocate left and right through the fitting member, thereby ensuring that the molten plastic strips are uniformly and quickly pre-cooled and shaped, preventing problems such as cracking of the plastic strips or irregular shapes of the plastic particles after pelletizing, and ensuring the quality of the produced plastic particles.

[0015] 2. By arranging a plurality of guide rods arranged circumferentially and evenly to guide the plastic strips, the present invention enables them to move horizontally to the right, thereby preventing the molten plastic strips from sagging and deforming under the action of gravity, making the dimensions of the plastic strips consistent along their axial directions, and thus ensuring that the sizes of the subsequently produced plastic particles are uniform.

[0016] 3. When the guide rods guide the plastic strips, the present invention provides air outlets with a flared structure on the opposite sides of the plurality of guide rods, enabling air to further evenly cool the plastic strips through the air outlets. At the same time, when the air blows on the surface of the plastic strips through the air outlets of the guide rods, there is a certain gap between the guide rods and the molten plastic strips, thereby preventing the molten plastic strips from adhering to the guide rods.

[0017] 4. The present invention drives the air blowing pipe to reciprocate left and right and swing circumferentially reciprocally by setting waveform holes, so that air does not directly blow the just extruded molten plastic strip through the air blowing pipe, causing it to deform, and further ensuring that the sizes of the subsequent produced plastic particles are uniform.

[0018] 5. The present invention drives the air blowing pipe to reciprocate left and right by setting a right-angle toggle plate and a matching rod and driving through a transmission ring, and the matching frequency of the right-angle toggle plate and the matching rod changes with the rotation speed of the screw of the screw extruder, so that the reciprocating frequency of the air blowing pipe left and right changes with the extrusion speed of the plastic strip by the screw extruder, further ensuring the rapid pre-cooling and shaping of the plastic strip. Brief Description of the Drawings

[0019] The present invention will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the present invention after partially removing the screw extruder and the installation cover.

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the present invention after partially removing the installation cover and the guiding unit.

[0023] Figure 4 It is a sectional view of a partial structure of the guiding unit of the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the square air vent tube and the guiding rod of the present invention.

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the pre-cooling unit of the present invention after partially removing the fixed cylinder.

[0026] Figure 7 It is a sectional view of the pre-cooling unit of the present invention.

[0027] Reference Signs: 1, screw extruder; 11, transmission shaft; 12, right-angle toggle plate; 2, installation cover; 21, air dispersion hole group; 3, guiding unit; 31, air inlet member; 311, sliding ring; 312, top extension spring; 313, square connecting tube; 314, telescopic tube; 315, three-way air pipe joint; 316, air inlet branch pipe; 32, cylinder; 33, square air vent tube; 34, guiding rod; 35, air outlet; 36, linear adjusting member; 361, linear adjusting plate; 362, right-angle locking rod; 4, pre-cooling unit; 41, fixed cylinder; 411, waveform hole; 42, flow dividing cylinder; 43, corrugated hose; 44, air blowing pipe; 45, fitting; 451, transmission ring; 452, reset spring rod; 453, transmission plate; 454, matching rod. Detailed implementation manners

[0028] The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention. For those techniques or conditions not specified in the embodiments, they shall be carried out according to the techniques or conditions described in the literature in the art or according to the product specifications.

[0029] Refer to Figure 1 and Figure 2 , a waste plastic recycling and pelletizing device, including a screw extruder 1. A mounting cover 2 is fixedly installed at the right end of the screw extruder 1. Discharge ports are respectively opened at the right end of the mounting cover 2 corresponding to the die orifice position of the screw extruder 1. A guiding unit 3 is installed in the mounting cover 2. A pre-cooling unit 4 is installed at the right end of the screw extruder 1 and inside the mounting cover 2; wherein, the die of the screw extruder 1 is installed on the screw extruder 1 in a detachable manner, and a plurality of circumferentially uniformly arranged die orifices are opened on the die.

[0030] The present invention is used for recycling waste plastics. The present invention can uniformly pre-cool and shape the extruded molten plastic strips, prevent problems such as cracking of the plastic strips or irregular shapes of the plastic particles after pelletizing, ensure the quality of the produced plastic particles. At the same time, the present invention can also guide the extruded molten plastic strips to prevent them from sagging and deforming under the action of gravity, thereby ensuring uniform sizes of the subsequent produced plastic particles.

[0031] Specifically, first, control the guiding unit 3 to move to the left extreme position, and connect the guiding unit 3 to an external blower. Then start the blower to convey air into the guiding unit 3 and the pre-cooling unit 4. Next, control the screw extruder 1 to melt and extrude the recycled waste plastics into plastic strips. The extruded molten plastic strips can move into the guiding unit 3 and move horizontally to the right under the action of the guiding unit 3. At this time, the blower conveys air into the guiding unit 3, so that the guiding unit 3 can have a certain cooling effect on the molten plastic strips and prevent the molten plastic strips from sticking to the guiding unit 3.

[0032] When the molten plastic strips are extruded a certain length, control the guiding unit 3 to return to the initial position to the right. At this time, there is a certain distance between the left end of the guiding unit 3 and the right end of the screw extruder 1. Thus, the pre-cooling unit 4 can quickly pre-cool and shape the just-extruded molten plastic strips, so that the extruded plastic strips continue to move to the right under the action of the guiding unit 3 and move out of the mounting cover 2 from the discharge port of the mounting cover 2. Finally, perform subsequent operations on the pre-cooled plastic strips that have moved out of the mounting cover 2, thereby making waste plastics into plastic particles and realizing the recycling of waste plastics.

[0033] Refer to Figures 2 - 5, the guiding unit 3 includes an air inlet member 31 installed in the installation cover 2. A plurality of cylinders 32 are circumferentially and uniformly arranged on the air inlet member 31. The cylinder wall of the cylinder 32 is provided with a hollow structure. The air inlet member 31 is used to introduce air into the hollow structure of the cylinder 32. A linear adjustment member 36 is connected between the air inlet member 31 and the installation cover 2. The linear adjustment member 36 is used to adjust the left and right positions of the air inlet member 31. A plurality of square ventilation cylinders 33 are radially slidably installed in the cylinder 32 and are circumferentially and uniformly arranged. Guide rods 34 are fixedly installed on the opposite sides of the plurality of square ventilation cylinders 33. Flared air outlets 35 are provided on the opposite sides of the plurality of guide rods 34. The air outlets 35 are communicated with the hollow structures of the square ventilation cylinders 33 and the cylinders 32; wherein, the installation position of the cylinder 32 corresponds to the die orifice position of the screw extruder 1. When the plurality of guide rods 34 are in the extreme position of approaching each other, the distance between the plurality of guide rods 34 corresponds to the die orifice size of the screw extruder 1 at this time, so that the extruded molten plastic strip can just move rightward along between the plurality of guide rods 34, and the sliding stroke of the square ventilation cylinder 33 in the present invention is set to be relatively short.

[0034] The guiding unit 3 is used to make the extruded molten plastic strip move horizontally to the right; specifically, initially, the cylinder 32 is in the right extreme position and its right end is in contact with the left inner wall of the installation cover 2. First, connect the air inlet member 31 to an external blower, control the linear adjustment member 36 to drive the cylinder 32 to move to the left extreme position through the air inlet member 31, so that the left end of the cylinder 32 is in contact with the right end of the screw extruder 1. Then start the blower to deliver air into the air inlet member 31. The air can pass through the air inlet member 31, the hollow structure of the cylinder 32 and the square ventilation cylinder 33 and blow out from the air outlet 35 of the guide rod 34.

[0035] When the screw extruder 1 melts and extrudes the recycled waste plastic into a plastic strip, at this time, the molten plastic strip moves to the opposite sides of the plurality of guide rods 34, so that the molten plastic strip moves horizontally to the right under the action of the plurality of guide rods 34. At the same time, air blows out through the air outlet 35 of the guide rod 34, so that the air can further cool the plastic strip. The air outlet 35 is provided with a flared structure, so as to ensure that the molten plastic strip is evenly cooled. The guide rod 34 is radially slidably connected to the cylinder 32 through the square ventilation cylinder 33. When the air blows on the surface of the plastic strip through the air outlet 35 of the guide rod 34, there is a certain gap between the guide rod 34 and the molten plastic strip at this time, so as to prevent the molten plastic strip from adhering to the guide rod 34.

[0036] When the plastic strip in a molten state is extruded by a certain length, the linear adjustment member 36 is controlled to drive the cylinder 32 to move to the right extreme position through the air inlet member 31, so that there is a certain distance between the left end of the cylinder 32 and the right end of the screw extruder 1 at this time. Thus, the pre-cooling unit 4 can quickly pre-cool and shape the just-extruded molten plastic strip. At the same time, the right end of the cylinder 32 contacts the left inner wall of the mounting cover 2. And because the mounting position of the cylinder 32 and the position of the discharge port of the mounting cover 2 correspond to the die port position of the screw extruder 1, the pre-cooled plastic strip can be removed from the discharge port of the mounting cover 2. And because the plastic strip is pre-cooled and shaped, the size of the plastic strip removed from the discharge port of the mounting cover 2 is consistent along its axial direction, thereby ensuring that the sizes of the plastic particles produced subsequently are uniform.

[0037] Refer to Figures 2 - 4 , the air inlet member 31 includes a sliding ring 311 slidably mounted left and right in the mounting cover 2, and the sliding ring 311 is arranged as a hollow structure. The right end of the sliding ring 311 is connected to the mounting cover 2 through a plurality of circumferentially uniformly arranged top extension springs 312. The inner side of the sliding ring 311 is connected to the cylinder 32 through a square connecting cylinder 313, and the hollow structure of the sliding ring 311 is communicated with the hollow structure of the cylinder 32 through the square connecting cylinder 313.

[0038] Refer to Figure 3 , a telescopic tube 314 is installed at the lower left side of the sliding ring 311, and the left end of the telescopic tube 314 is connected to the right end of the horizontal section of a T-shaped three-way air pipe joint 315 fixedly installed on the mounting cover 2.

[0039] The air inlet member 31 is used to introduce air into the hollow structure of the cylinder 32; specifically, first, the lower end of the vertical section of the three-way air pipe joint 315 is connected to an external blower, and the blower is started to introduce air into the three-way air pipe joint 315. The air enters the hollow structure of the sliding ring 311 through the telescopic tube 314, and the hollow structure of the cylinder 32 is communicated with the hollow structure of the sliding ring 311 through the square connecting cylinder 313. Thus, the air can enter the hollow structure of the cylinder 32. When adjusting the left and right positions of the sliding ring 311, the telescopic tube 314 can be compressed or stretched at this time, and thus it will not affect the air entering the hollow structure of the sliding ring 311.

[0040] Refer to Figure 3 , the linear adjustment member 36 includes a linear adjustment plate 361 fixedly installed on the upper part of the sliding ring 311. The upper end of the linear adjustment plate 361 is arranged as an elastic telescopic structure and slidably penetrates through the mounting cover 2 left and right. Right-angle locking rods 362 are fixedly installed at the front and rear ends on the upper side of the linear adjustment plate 361.

[0041] Refer to Figure 3, two locking grooves are symmetrically arranged in the front and back on the upper left side of the installation cover 2, and the right-angle locking rod 362 is used to cooperate with the locking grooves to lock the left extreme position of the sliding ring 311.

[0042] The linear adjustment member 36 is used to adjust the left and right positions of the sliding ring 311; specifically, initially, the sliding ring 311 is in the right extreme position under the action of the top extension spring 312, and at this time, the right-angle locking rod 362 is pressed against the installation cover 2 under the elastic action of the linear adjustment plate 361. Before the control screw extruder 1 melts and extrudes the recycled waste plastic into plastic strips, manually move the linear adjustment plate 361 to drive the sliding ring 311 to move left to the left extreme position, so that the sliding ring 311 drives the left end of the cylinder 32 to contact the right end of the screw extruder 1 through the square connecting cylinder 313. At the same time, the right-angle locking rod 362 moves to the corresponding position of the locking groove of the installation cover 2, and the right-angle locking rod 362 is inserted into the locking groove under the elastic action of the telescopic end of the linear adjustment plate 361, realizing the locking of the linear adjustment plate 361, and further realizing the position locking of the sliding ring 311, so that the left end of the cylinder 32 always contacts the right end of the screw extruder 1.

[0043] When the molten plastic strip is extruded a certain length, manually pull up the telescopic end of the linear adjustment plate 361 to move the right-angle locking rod 362 out of the locking groove, thereby releasing the position locking of the sliding ring 311, so that the sliding ring 311 returns to the initial position to the right under the action of the top extension spring 312, so that there is a certain distance between the left end of the cylinder 32 and the right end of the screw extruder 1 at this time, and at the same time, the right end of the cylinder 32 always contacts the left inner wall of the installation cover 2, so that the pre-cooled and shaped plastic strip can be removed from the discharge port of the installation cover 2.

[0044] Refer to Figure 2 、 Figure 6 and Figure 7 , the pre-cooling unit 4 includes a fixed cylinder 41 fixedly installed at the right end of the screw extruder 1. An annular shunt cylinder 42 is fixedly installed on the left inner wall of the fixed cylinder 41, and the shunt cylinder 42 is connected to the air inlet member 31. A plurality of air blowing pipes 44 arranged circumferentially and evenly are installed on the outside of the shunt cylinder 42 through a corrugated hose 43, and one end of the air blowing pipe 44 far from the shunt cylinder 42 slides through the fixed cylinder 41. A cooperating member 45 is installed among the plurality of air blowing pipes 44, and the cooperating member 45 is used to drive the air blowing pipes 44 to move left and right reciprocally and swing circumferentially reciprocally; wherein, the installation position of the air blowing pipe 44 corresponds to the die orifice position of the screw extruder 1.

[0045] Refer to Figure 2 and Figure 7 , an air inlet branch pipe 316 is fixedly installed at the upper end of the vertical section of the three-way air pipe joint 315, and the upper end of the air inlet branch pipe 316 penetrates through the fixed cylinder 41 and is connected to the shunt cylinder 42.

[0046] Refer toFigure 1 and Figure 3 On the outer side of the installation cover 2, a plurality of groups of air dispersion hole groups 21 are evenly arranged left and right. Each group of air dispersion hole groups 21 includes a plurality of air dispersion holes evenly arranged circumferentially.

[0047] The pre-cooling unit 4 is used to quickly pre-cool and shape the just-extruded molten plastic strip. Specifically, when there is a certain distance between the left end of the cylinder 32 and the right end of the screw extruder 1, the air outlet of the air blowing pipe 44 is just opposite to the corresponding just-extruded molten plastic strip. When the blower is started to introduce air into the three-way air pipe joint 315, the air can also enter the shunt cylinder 42 through the intake branch pipe 316 at this time, so that the air enters each air blowing pipe 44 through the shunt cylinder 42, and then the air can quickly pre-cool and shape the corresponding just-extruded molten plastic strip.

[0048] At the same time, the fitting 45 drives the air blowing pipe 44 to reciprocate left and right and swing circumferentially, thereby preventing the air blowing pipe 44 from directly blowing the just-extruded molten plastic strip and causing it to deform. At the same time, it can ensure that the plastic strip is cooled evenly and quickly, ensure that the molten plastic strip is quickly pre-cooled and shaped, prevent problems such as cracking of the plastic strip or irregular shapes of the plastic particles after pelletizing, ensure the quality of the produced plastic particles, and the air blown out from the air outlet 35 of the air blowing pipe 44 and the guide rod 34 can be dispersed from the air dispersion hole group 21 of the installation cover 2, preventing the accumulation of hot air generated after pre-cooling the molten plastic strip in the installation cover 2.

[0049] Refer to Figure 6 and Figure 7 The fitting 45 includes a transmission ring 451 distributed on the left side inside the fixed cylinder 41. The right end of the transmission ring 451 is fixedly connected to the right inner wall of the fixed cylinder 41 through a plurality of reset spring rods 452 evenly arranged circumferentially. A plurality of fitting rods 454 evenly arranged circumferentially are fixedly installed inside the transmission ring 451.

[0050] Refer to Figure 6 and Figure 7 At the positions corresponding to the air blowing pipes 44 on the left end of the transmission ring 451, transmission plates 453 are fixedly installed. Square holes are provided on the left sides of the transmission plates 453. The lower ends of the air blowing pipes 44 are rotatably installed in the square holes of the corresponding transmission plates 453.

[0051] Refer to Figure 2 and Figure 7 On the right end of the rotating shaft of the screw of the screw extruder 1, a transmission shaft 11 is fixedly installed. The right end of the transmission shaft 11 sequentially rotates through the right end of the screw extruder 1 and the left end of the fixed cylinder 41 and passes through the middle of the shunt cylinder 42. On the outer side of the right end of the transmission shaft 11, two right-angle toggle plates 12 arranged centrosymmetrically are fixedly installed. The right ends of the horizontal sections of the right-angle toggle plates 12 are all provided with inclined surfaces that cooperate with the fitting rods 454.

[0052] The fitting 45 is used to drive the air blowing pipe 44 to reciprocate left and right; specifically, when the screw extruder 1 melts and extrudes the recycled waste plastics into plastic strips, the screw of the screw extruder 1 drives the transmission shaft 11 to rotate, so that the transmission shaft 11 drives the right-angled toggle plate 12 to rotate. When the right-angled toggle plate 12 rotates to the corresponding position of the fitting rod 454, the inclined surface of the right-angled toggle plate 12 and the fitting rod 454 cooperate to drive the transmission ring 451 to move to the right and compress the return spring rod 452. When the right-angled toggle plate 12 is separated from the fitting rod 454, the transmission ring 451 returns to its initial position under the action of the return spring rod 452, and a plurality of fitting rods 454 are provided to realize the left and right reciprocating movement of the transmission ring 451. Furthermore, the transmission ring 451 drives the air blowing pipe 44 to reciprocate left and right through the transmission plate 453, so that the air passes through the air blowing pipe 44 to uniformly and quickly pre-cool and shape the molten plastic strips.

[0053] Moreover, when the speed of the screw extruder 1 for extruding plastic strips is faster, the rotational speed of the screw of the screw extruder 1 becomes faster, and the screw of the screw extruder 1 drives the right-angled toggle plate 12 to rotate faster through the transmission shaft 11. Furthermore, the cooperation between the right-angled toggle plate 12 and the fitting rod 454 drives the transmission ring 451 to reciprocate left and right more frequently under the action of the return spring rod 452, and then the frequency of the reciprocating movement of the air blowing pipe 44 becomes higher, further ensuring the rapid pre-cooling and shaping of the plastic strips.

[0054] Refer to Figure 2 , waveform holes 411 are formed in the outer side of the fixed cylinder 41 corresponding to the positions of the air blowing pipes 44, and the air blowing pipes 44 are slidably arranged in their corresponding waveform holes 411.

[0055] When the air blowing pipe 44 reciprocates left and right, the air blowing pipe 44 swings circumferentially under the action of the waveform hole 411, so that the air does not directly blow the just-extruded molten plastic strips through the air blowing pipe 44 to cause them to deform.

[0056] In addition, it should be understood that although this specification is described according to the embodiments, not each embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waste plastic recycling and granulation device, comprising a screw extruder (1), characterized in that: The right end of the screw extruder (1) is fixedly provided with a mounting cover (2), the right end of the mounting cover (2) corresponding to the die opening of the screw extruder (1) is provided with a discharge port, a guide unit (3) is installed in the mounting cover (2), and a pre-cooling unit (4) is installed at the right end of the screw extruder (1) and located in the mounting cover (2); The guide unit (3) comprises an air intake member (31) installed in the mounting cover (2), a plurality of circumferentially evenly arranged cylinders (32) are installed on the air intake member (31), the cylinder wall of the cylinder (32) is set as a hollow structure, the air intake member (31) is used to pass air into the hollow structure of the cylinder (32), a linear adjustment member (36) is connected between the air intake member (31) and the mounting cover (2), the linear adjustment member (36) is used to adjust the left and right position of the air intake member (31), a plurality of circumferentially evenly arranged square air cylinders (33) are radially slidably installed in the cylinder (32), guide rods (34) are fixedly installed on opposite sides of the plurality of square air cylinders (33), and air outlets (35) with expanded structures are opened on opposite sides of the plurality of guide rods (34), and the air outlets (35) are connected through the square air cylinders (33) and the hollow structure of the cylinder (32); The pre-cooling unit (4) comprises a fixed cylinder (41) fixedly mounted on the right end of the screw extruder (1), a diverter cylinder (42) of an annular structure fixedly mounted on the left inner wall of the fixed cylinder (41), and the diverter cylinder (42) is connected to the air inlet (31), a plurality of circumferentially evenly arranged blowing pipes (44) are mounted on the outer side of the diverter cylinder (42) through a corrugated hose (43), and one end of the blowing pipe (44) away from the diverter cylinder (42) slides through the fixed cylinder (41), and a matching piece (45) is commonly mounted between the plurality of blowing pipes (44), and the matching piece (45) is used to drive the blowing pipe (44) to move back and forth left and right and to swing back and forth circumferentially.

2. A waste plastic recycling and granulation equipment according to claim 1, characterized in that: The air intake member (31) comprises a sliding ring (311) which is slidably mounted in the mounting cover (2) from left to right, and the sliding ring (311) is arranged as a hollow structure. The right end of the sliding ring (311) is connected to the mounting cover (2) via a plurality of circumferentially evenly arranged top extension springs (312), the inner side of the sliding ring (311) is connected to the cylinder (32) via a square connecting cylinder (313), and the hollow structure of the sliding ring (311) is connected to the hollow structure of the cylinder (32) via the square connecting cylinder (313).

3. A waste plastic recycling and granulation equipment according to claim 2, characterized in that: A telescopic tube (314) is installed at the lower left side of the sliding ring (311), the left end of the telescopic tube (314) is connected to the right end of the horizontal section of a three-way air pipe joint (315) of a T-shaped structure fixedly installed on the mounting cover (2), and an intake branch pipe (316) is fixedly installed at the upper end of the vertical section of the three-way air pipe joint (315), and the upper end of the intake branch pipe (316) passes through the fixed cylinder (41) and is connected to the diverter cylinder (42).

4. A waste plastic recycling and granulation equipment according to claim 2, characterized in that: The linear adjustment member (36) comprises a linear adjustment plate (361) fixedly mounted on the upper part of the sliding ring (311); the upper end of the linear adjustment plate (361) is provided with an elastic telescopic structure and slides left and right to penetrate the mounting cover (2); right-angle locking rods (362) are fixedly mounted on the front and rear ends of the upper side of the linear adjustment plate (361).

5. A waste plastic recycling and granulation equipment according to claim 4, characterized in that: The left side of the upper part of the installation cover (2) is provided with two locking grooves which are arranged symmetrically in front and back, and the right-angle locking rod (362) is used to cooperate with the locking groove to lock the left limit position of the sliding ring (311).

6. The waste plastic recycling and granulation equipment according to claim 1, characterized in that: The matching piece (45) comprises a transmission ring (451) distributed on the left side inside the fixed cylinder (41); the right end of the transmission ring (451) is fixedly connected to the right inner wall of the fixed cylinder (41) via a plurality of circumferentially evenly arranged return spring rods (452); and a plurality of circumferentially evenly arranged matching rods (454) are fixedly installed on the inner side of the transmission ring (451).

7. A waste plastic recycling and granulation equipment according to claim 6, characterized in that: A transmission plate (453) is fixedly mounted at the position of the left end of the transmission ring (451) corresponding to the blowing pipe (44), a square hole is opened on the left side of the transmission plate (453), and the lower end of the blowing pipe (44) is rotatably mounted in the corresponding square hole of the transmission plate (453).

8. The waste plastic recycling and granulation equipment according to claim 6, characterized in that: A transmission shaft (11) is fixedly installed on the right end of the screw rotating shaft of the screw extruder (1). The right end of the transmission shaft (11) rotates in sequence to penetrate the right end of the screw extruder (1) and the left end of the fixed cylinder (41) and pass through the middle of the diverter cylinder (42). Two right-angle toggle plates (12) arranged symmetrically with respect to the center are fixedly installed on the outer side of the right end of the transmission shaft (11). The right ends of the horizontal sections of the right-angle toggle plates (12) are both arranged as inclined surfaces that cooperate with the matching rod (454).

9. The waste plastic recycling and granulation equipment according to claim 1, characterized in that: The outer side of the fixed cylinder (41) is provided with a corrugated hole (411) at a position corresponding to the blowing pipe (44), and the blowing pipe (44) is slidably arranged in the corresponding corrugated hole (411).

10. The waste plastic recycling and granulation equipment according to claim 1, characterized in that: The outer side of the installation cover (2) is provided with a plurality of groups of air diffusion holes (21) evenly arranged in the left and right directions, and each group of air diffusion holes (21) includes a plurality of air diffusion holes evenly arranged in the circumferential direction.

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