Plastic granulation equipment

Abstract

The invention discloses plastic granulation equipment which comprises a die head, a cutter set with a rotating function and a moving block, and the die head is provided with discharging ports distributed in an annular array mode. A plurality of cutters are arranged on the cutter set, each cutter is provided with a containing cavity capable of making contact with the tangent plane of the discharging port, a reciprocating moving block is arranged above the containing cavity, a channel allowing balls to pass through can be formed between a rounding cavity formed in the moving block and the containing cavity in the reciprocating moving process, and the cross section of the channel is not larger than that of the discharging port. The device has the advantages that the melt line extruded from the die head is cut off to form melt line particles, the melt line particles are pushed to be rounded and thrown out to make contact with a water film to be cooled by means of rotating centrifugal force, and the produced plastic particles are high in spherical proportion.

Description

TECHNICAL FIELD

[0001] The application relates to a runway particle manufacturing technology field, in particular to a plastic granulating device. BACKGROUND

[0002] The plastic granulator is used for manufacturing plastic particles by means of heating, melting, mixing, extruding, cooling and cutting of various plastic raw materials.

[0003] The plastic runway particles need to have elasticity, wear resistance and environmental protection, and the shapes of the plastic runway particles in the bottom layer, the structure layer and the surface layer are different; for the runway surface layer particles, the particles need to be nearly spherical and cannot have sharp edges and corners; the water ring cutting method can be used to manufacture the corresponding plastic particles.

[0004] The cutter of the plastic granulator rotates at a high speed on the surface of the die head, and the extruded melt line is cut into particles at a moment, and is cooled and taken away by the water ring; after the melt line is cut into particles by the high-speed rotating cutter, the particles are cooled; after the melt line is cut by the cutter, the particle cross section is cooled by the water ring, but part of the particles still have irregularities; for the use of the plastic runway surface layer particles, high requirements need to be met, and the formed particles need to be screened, and the nearly spherical particles need to be selected; the utilization rate of the particles manufactured by the runway surface layer granulation is not high.

[0005] In view of this, the application provides a plastic granulating device. SUMMARY

[0006] The application aims to provide a plastic granulating device to solve the problems in the background.

[0007] To achieve the above-mentioned purpose, the application provides the following technical scheme: a plastic granulating device comprising a die head, wherein the die head is provided with annular array arranged discharge ports, and further comprising a cutter group with rotating function and a moving block; The cutter group is provided with a plurality of cutters, each of which is provided with a receiving cavity capable of contacting the cutting surface of the discharge port; the receiving cavity is provided with a moving block with reciprocating motion above the receiving cavity; a rounding cavity is formed in the moving block, and the rounding cavity and the receiving cavity can form a channel for passing through a spherical body during reciprocating motion, and the cross section of the channel is not greater than that of the discharge port.

[0008] The molten material after melting by the granulating device is extruded from the discharge port of the die head, the high-speed rotating cutter cuts the extruded melt line particles, and the cut melt line particles enter the receiving cavity along with the cutter rotation. At this time, the moving block guide portion is about to enter the recess of the guide unit, and the moving block guide portion enters the recess of the guide unit due to the centrifugal force of rotation. In this process, the rolling cavity on the moving block first forms a hemispherical cavity with the receiving cavity to cut off the excess part of the melt line particles, and the rolling cavity continues to throw out to push the cut melt line particles along the channel through which the ball communicates with the receiving cavity, and the melt line particles rolling along the channel through which the ball communicates are rolled into spherical shape. The moving block guide portion contacts the next protruding guide of the guide unit, and the moving block is pushed back to expose the receiving cavity. The cutter rotates to the next discharge port, continues to cut the extruded melt line particles into the receiving cavity, and repeats the above process, and the cut melt line particles maintain a high proportion of spherical shape.

[0009] Preferably, a plurality of shanks are arranged in an annular array on the cutter group, and the cutter is connected to the shank by a bolt, the cutter connecting section is inserted into the groove of the shank, and the bolt passes through the hole on the cutter and the hole on the shank to fix; the cutter cutting side rotates at high speed on the surface of the die head.

[0010] Preferably, the cutter cutting side along the rotation direction of the cutter group is provided as an inclined surface A, and the cutter cutting side at the inclined surface A is sequentially provided with a spherical cavity A and an arc cavity, the spherical cavity A serving as a receiving cavity, and the arc cavity serving as a channel through which a ball passes.

[0011] The inner wall at the communication between the spherical cavity A and the arc cavity is continuous.

[0012] Preferably, it further comprises a rolling unit, and the rolling unit comprises a fixed strip and a moving block. The fixed strip is fixed on the cutter, and the moving block is movably arranged along the cutter, and the moving block and the fixed strip are connected by an extension piece. The side end of the moving direction of the moving block is provided with a spherical cavity B, and the spherical cavity B serves as a rolling cavity.

[0013] Preferably, during the movement of the spherical cavity B, the melt line particles rolling in the arc cavity are pushed and extruded by the spherical surface of the spherical cavity B to be shaped.

[0014] The melt line particles entering the spherical cavity A are pushed by the moving spherical cavity B into the arc cavity, the melt line particles roll along the arc cavity, and the spherical surface of the spherical cavity B cooperates with the arc cavity to shape the melt line particles into spherical shape.

[0015] Preferably, the moving block corresponding to the spherical cavity B is provided as an inclined surface B, and the inclined surface B contacts the inclined surface A.

[0016] The melt line particles are cut into the spherical cavity A, and the spherical cavity B and the arc-shaped cavity form a semi-spherical cavity, and then continue to move, so that the excess part of the melt line particles is cut off, the cut-off part is pushed by the side surface at the inclined surface B and moves along the inclined surface A, and the cut-off part is thrown out along the inclined surface A.

[0017] Preferably, the guiding unit comprises a connecting ring and a guiding ring; The connecting ring is fixed to the extrusion side of the die head through the connecting block, and the guiding ring is fixed to the inner periphery of the connecting ring. The side end of the moving block throwing direction is fixed with a guiding rod, and the guiding rod contacts the wavy inner periphery of the guiding ring and reciprocates.

[0018] The guiding rod reciprocates by undulating along the inner periphery of the guiding ring during rotation, so that the moving block reciprocates along the cutter.

[0019] Preferably, the contact end of the guiding rod and the guiding ring is provided with a spherical surface, so that the resistance is small when the guiding rod and the guiding ring guide.

[0020] Compared with the prior art, the application has the following advantages: In the application, the cutter group, the rounding unit and the guiding unit are provided, the melt line cut from the die head is cut to form melt line particles, and the melt line particles are pushed and rounded by the centrifugal force of rotation, so that the melt line particles are formed into spherical shape and thrown out to contact the water film for cooling, the proportion of the produced plastic particles in spherical shape is high, and the problem that although the cross section of the particles cut by the cutter is cooled by the water ring, some particles still have irregularities is solved.

[0021] In the application, the melt line particles are cut into the spherical cavity A, and the spherical cavity B and the arc-shaped cavity form a semi-spherical cavity, and then continue to move, so that the excess part of the melt line particles is cut off, the cut-off part is pushed by the side surface at the inclined surface B and moves along the inclined surface A, and the cut-off part is thrown out along the inclined surface A. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the application; Figure 2 It is a schematic diagram of the melt line cutting structure of the application; Figure 3 It is a schematic diagram of the melt line cutting structure of the application; Figure 4 It is a schematic diagram of the melt line rounding front section structure of the application; Figure 5 It is a schematic diagram of the melt line rounding middle section structure of the application; Figure 6 It is a schematic diagram of the melt line rounding rear section structure of the application; Figure 7 Figure is a schematic diagram of the connecting structure of the rounding unit of the present application; Figure 8 Figure is a schematic diagram of the guiding unit structure of the present application; Figure 9 Figure is a schematic diagram of the melt line cutting and rounding structure of the present application; Figure 10 Figure is a schematic diagram of the water ring cooling water channel structure of the present application; Figure 11 Figure is a schematic diagram of the guiding unit structure of the present application.

[0023] In the figure: 100, frame; 200, holder; 300, motor; 400, pelletizing chamber; 500, cutter group; 600, guiding unit; 700, water ring cooling water channel; 800, rounding unit; 900, die head; 501, cutter handle; 502, cutter; 5021, bevel A; 5022, spherical cavity A; 5023, arc-shaped cavity; 601, connecting ring; 602, guiding ring; 603, connecting block; 801, fixed strip; 802, moving block; 803, telescopic piece; 804, guiding rod; 8021, spherical cavity B; 8022, bevel B; 901, discharge port. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] A plastic pelletizing device, please refer to Figures 1 to 3 , comprising a frame 100 for installing a pelletizing mechanism, a holder 200 fixed on the frame 100 for installing a motor 300 and a pelletizing chamber 400, and a water ring cooling water channel 700 arranged in the pelletizing chamber 400 for cooling.

[0026] The pelletizing mechanism includes a feeding system, an extrusion system, a filtering system, a pelletizing head, a pelletizing device, a dehydration and drying system, and a control system.

[0027] The feeding system continuously and stably feeds the plastic raw material into the extrusion system; In this embodiment, the feeding system can adopt a hopper with gravity feeding, a forced feeding screw, a side feeder, etc.

[0028] The extrusion system comprises a cylinder and a screw, and the material is transported, compressed, sheared and mixed in the cylinder by the screw, and is melted and plasticized into a uniform melt by external heating and self-friction heat; In this embodiment, the extrusion system can adopt a double screw.

[0029] The filtration system comprises a porous plate and a filter screen, which filters out impurities in the melt and improves the purity of particles; increases the back pressure of the melt, and promotes plasticization and mixing more uniformly.

[0030] The pelletizer head comprises a head and a die head 900; The head guides and uniformly distributes the molten plastic into the die holes; The die head 900 is drilled with a specific number, diameter and arrangement of discharge ports 901. The melt is extruded through the discharge ports 901 to form plastic strips (strip pelletization) or directly form melt lines (underwater / water ring pelletization); In this embodiment, the die head 900 directly forms melt lines for water ring pelletization.

[0031] The cutting device comprises strip pelletization and die face hot cutting; The strip pelletization is to cool and solidify the extruded plastic strips in a cooling water tank, and then pull them to the rotary blade of the cutting machine to cut them into particles; The die face hot cutting includes water ring cutting, underwater cutting and air-cooled die face hot cutting; In this embodiment, the water ring cutting is to cut the just extruded melt line into particles by the high-speed rotating cutter on the surface of the die head 900, which is cooled and taken away by the high-speed rotating water ring at the same time.

[0032] For the wet particles generated by the water ring, a dehydration and drying system is needed to remove the surface moisture; In this embodiment, the dehydration and drying system adopts centrifugal dehydrator and / or vibrating screen, hot air dryer and other equipment.

[0033] The control system is mainly a PLC or computer control system.

[0034] The above pelletization mechanism is installed on the rack 100.

[0035] In this embodiment, the motor 300 can adopt a servo motor, which controls the power of the motor 300 through a server, and the motor 300 drives the rotation of the screw of the extrusion system through the transmission wheel set.

[0036] The water ring cooling water channel 700 surrounds the cutter area, and the tangential water inlet is arranged on the side wall of the cutting chamber 400, so that the water flow enters the water ring cooling water channel 700 tangentially, and the water flow forms a high-speed vortex after being injected along the tangential direction, and forms a uniform water film on the inner wall of the water ring cooling water channel 700. The contact time of the particles with the water film is ≤0.3 seconds, and the surface temperature of the particles is suddenly reduced from 200℃ to below 60℃, thereby inhibiting crystallization and deformation.

[0037] Referring to Figures 2 to 10 The granulation device includes a cutter set 500, a rounding unit 800, and a guide unit 600. The melt line extruded from the die head 900 is sheared by the cutter set 500.

[0038] The cutter set 500 connected to the output end of the motor 300 rotates at high speed, and the cutter 502 connected to the cutter set 500 rotates at high speed on the surface of the die head 900 for shearing the melt line extruded from the die head 900.

[0039] In this embodiment, the transmission shaft of the motor 300 is connected to the cutter set 500 through a shaft coupling.

[0040] In this embodiment, a plurality of cutter handles 501 are arranged in a ring array on the cutter set 500, and the cutter 502 is connected to the cutter handle 501 through a bolt. The connecting section of the cutter 502 is inserted into the groove of the cutter handle 501, and the bolt passes through the hole on the cutter 502 and the hole on the cutter handle 501 to be fixed. The end of the bolt passing through can be installed with a nut. The cutter 502 and the cutter handle 501 can be assembled or disassembled.

[0041] The cutter 502 is provided with a spherical cavity A 5022 and an arc-shaped cavity 5023 in sequence on the shearing side. The spherical cavity A 5022 contains the sheared melt line particles.

[0042] The rounding unit 800 includes a fixed strip 801 and a moving block 802. The fixed strip 801 is fixed on the cutter 502, and the moving block 802 is movably arranged along the cutter 502. The moving block 802 and the fixed strip 801 are connected through an extension piece 803. The moving block 802 is thrown out along the cutter 502 due to the centrifugal force of rotation, and the extension piece 803 adjusts the length accordingly. The side end of the moving block 802 in the throwing direction is provided with a spherical cavity B 8021. With the throwing of the moving block 802, the spherical cavity B 8021 first forms a hemispherical cavity with the spherical cavity A 5022. The spherical cavity B 8021 continues to throw the sheared melt line particles along the arc-shaped cavity 5023. The melt line particles rolling along the arc-shaped cavity 5023 are rounded into spherical shape and then thrown out to contact the water film.

[0043] In this embodiment, the extension piece 803 is a telescopic tube, and the two ends of the telescopic tube are fixedly connected with the moving block 802 and the fixed strip 801, respectively.

[0044] In this embodiment, the inner wall of the communication part between the spherical cavity A 5022 and the arc-shaped cavity 5023 is continuous. The melt line particles pushed by the spherical cavity B 8021 are not hindered to enter the arc-shaped cavity 5023 from the spherical cavity A 5022.

[0045] The melt line particles rolling in the arc-shaped cavity 5023 are pushed and extruded by the spherical surface of the ball cavity B 8021 during the movement of the ball cavity B 8021 along the arc-shaped cavity 5023. The melt line particles entering the ball cavity A 5022 are pushed by the moving ball cavity B 8021 into the arc-shaped cavity 5023, and the melt line particles roll in the arc-shaped cavity 5023, and the spherical surface of the ball cavity B 8021 cooperates with the arc-shaped cavity 5023 to shape the melt line particles into a spherical shape.

[0046] The guide unit 600 comprises a connecting ring 601 and a guide ring 602; the connecting ring 601 is fixed on the extrusion side of the die head 900 through a connecting block 603, and the guide ring 602 is fixed on the inner periphery of the connecting ring 601; the side end of the moving block 802 in the throwing direction is fixed with a guide rod 804, and the guide rod 804 is in contact with the wavy inner periphery of the guide ring 602 and reciprocates. During the rotation of the guide rod 804, the guide rod 804 rises and falls along the wavy inner periphery of the guide ring 602, thereby reciprocating, so as to realize the reciprocating movement of the moving block 802 along the cutter 502.

[0047] The moving block 802 performs the rounding process through the recesses of the guide ring 602, and retreats through the protruding guide of the guide ring 602, waiting for the next rounding process of the melt line particles.

[0048] In this embodiment, please refer to Figures 4 to 7 The contact end of the guide rod 804 is provided with a spherical surface, and the resistance of the guide rod 804 and the guide ring 602 is small when guiding. The contact end of the guide rod 804 can also be provided with a ball.

[0049] In this embodiment, the inner periphery of the guide ring 602 can also be provided with a corresponding groove, and the contact end of the guide rod 804 slides along the groove.

[0050] Please refer to Figures 4 to 7 The cutter 502 on the cutting side in the rotation direction of the cutter group 500 is provided with an inclined surface A 5021, and the ball cavity A 5022 and the arc-shaped cavity 5023 are located at the inclined surface A 5021. The corresponding moving block 802 of the ball cavity B 8021 is provided with an inclined surface B 8022, and the inclined surface B 8022 is in contact with the inclined surface A 5021. The melt line particles are cut off and enter the ball cavity A 5022, the melt line particles are embedded in the ball cavity A 5022 with interference, and the ball cavity B 8021 forms a hemispherical cavity with the arc-shaped cavity 5023 and continues to move, which can cut off the excess part of the melt line particles, the cut-off part is pushed by the side surface at the inclined surface B 8022 and moves along the inclined surface A 5021, and the cut-off part is enlarged along the inclined surface A 5021 to enlarge the throwing range of the cut-off part.

[0051] Working principle: the molten material after melting by the granulation equipment is extruded by the die head 900, the cutter 502 driven by the motor 300 rotates at high speed along the surface of the die head 900, the extruded melt line particles are cut off and pushed into the spherical cavity A 5022 by the cutter 502 rotation, at this time the guide rod 804 on the moving block 802 will enter the recess of the guide ring 602, after the melt line particles enter the spherical cavity A 5022, the guide rod 804 is in the recess of the guide ring 602 due to the centrifugal force of the high-speed rotation of the cutter 502, in this process, the spherical cavity B 8021 on the moving block 802 first forms a semispherical cavity with the spherical cavity A 5022, as the spherical cavity B 8021 continues to spin out, the spherical cavity B 8021 cuts off the excess part of the melt line particles, the spherical cavity B 8021 continues to spin out to push the cut-off melt line particles along the arc-shaped cavity 5023 connected with the spherical cavity A 5022, the melt line particles rolling along the arc-shaped cavity 5023 are rubbed into spherical shape and then spin out, the melt line particles after spinning out contact the water film for cooling.

[0052] And in this process, the cut-off part of the melt line particles is pushed by the side of the inclined surface B 8022 and moves along the inclined surface A 5021, and the spin-out range of the cut-off part is enlarged along the inclined surface A 5021.

[0053] With the continuation of the rotation, until the guide rod 804 contacts the next protrusion of the guide ring 602, the contact end of the guide rod 804 enters from the side into the corresponding protrusion of the guide ring 602, the guide rod 804 is pushed back, the moving block 802 is pushed back along the cutter 502, the moving block 802 is exposed after being pushed back, at this time the cutter 502 rotates to the next discharge port 901 of the die head 900, the cutter 502 continues to cut off the extruded melt line particles to enter the spherical cavity A 5022, the guide rod 804 enters the next recess of the guide ring 602 again to repeat the above process.

[0054] The cut-off melt line particles maintain a high proportion of spherical shape, and the mixed water is discharged from the bottom outlet of the cutting chamber 400.

[0055] It is obvious to a person skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A plastic pelletizing device comprising a die (900) having a circular array of discharge ports (901) formed therein, characterized in that: Also include the knife group (500) and shift block (802) with rotation function; The knife group (500) is provided with a plurality of cutters (502), each cutter (502) is provided with a receiving cavity capable of being in contact with the cutting surface of the discharge port (901), a shift block (802) with reciprocating motion is arranged above the receiving cavity, a channel capable of passing through the ball is formed between the rubbing cavity and the receiving cavity during the reciprocating motion of the shift block (802), the cross section of the channel is not greater than the discharge port (901), and a rubbing unit (800) is further included; the rubbing unit (800) includes a fixed strip (801) and a shift block (802); the fixed strip (801) is fixed on the cutter (502), the shift block (802) is movably arranged along the cutter (502), and the shift block (802) and the fixed strip (801) are connected through an extension piece (803); a ball cavity B (8021) is arranged at the side end of the shift block (802) in the throwing direction, and the ball cavity B (8021) serves as the rubbing cavity.

2. The plastic pelletizing apparatus of claim 1, wherein: The knife group (500) is provided with a plurality of knife handles (501) arranged in an annular array, the knife handle (501) is connected with a cutter (502) through a bolt, and the cutter (502) cutting side is high-speed rotating on the surface of the die head (900).

3. A plastic pelletizing apparatus according to claim 2, wherein: The cutter (502) cutting side along the rotating direction of the knife group (500) is provided with a bevel A (5021), the cutter (502) cutting side at the bevel A (5021) is sequentially provided with a ball cavity A (5022) and an arc cavity (5023), the ball cavity A (5022) serves as the receiving cavity, and the arc cavity (5023) serves as the channel through which the ball passes.

4. The plastic pelletizing apparatus of claim 1, wherein: During the movement of the ball cavity B (8021) along the arc cavity (5023), the melt line particles rolling in the arc cavity (5023) are pushed and extruded by the spherical surface of the ball cavity B (8021) and are shaped.

5. The plastic pelletizing apparatus of claim 1, wherein: The shift block (802) corresponding to the ball cavity B is provided with a bevel B (8022), and the bevel B (8022) is in contact with the bevel A (5021).

6. The plastic pelletizing apparatus of claim 1, wherein: Further include a guide unit (600), the guide unit (600) includes a connecting ring (601) and a guide ring (602); The connecting ring (601) is fixed on the extrusion side of the die head (900) through a connecting block (603), and the guide ring (602) is fixed on the inner periphery of the connecting ring (601); The side end of the shift block (802) in the throwing direction is fixed with a guide rod (804), the guide rod (804) is in contact with the wave-shaped inner periphery of the guide ring (602) and reciprocates.

7. A plastic pelletizing apparatus according to claim 6, wherein: The contact end of the guide rod (804) and the guide ring (602) is provided with a spherical surface.

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