Cooling device and cooling method for plastic granulator

Abstract

The invention relates to the technical field of cooling devices, and discloses a plastic granulator cooling device and a cooling method.The plastic granulator cooling device comprises a cooling pond, a material guiding box is fixedly installed in the cooling pond, a material falling channel penetrating through the upper surface and the lower surface of the material guiding box is formed in the material guiding box, and the material falling channel is used for guiding plastic strips extruded by a die head to enter the cooling pond to be cooled; a plurality of anti-bonding assemblies are arranged in the blanking channel; through reciprocating swing of the anti-bonding assemblies (guide plates) which are symmetrically distributed in a staggered mode, the plastic strips are effectively prevented from being bonded in the cooling process, and the forming quality of the plastic strips is improved.

Description

Technical Field

[0001] This invention relates to the field of cooling device technology, and more particularly to a cooling device and cooling method for a plastic granulator. Background Technology

[0002] A plastic granulator is a mechanical device that processes waste plastics or new materials into granular plastics through processes such as melting, extrusion, and cutting. The produced plastic granules can be used for injection molding, blow molding, and other molding processes. During the production process, molten plastic is extruded into strips through a die and then falls into a water tank to cool and solidify.

[0003] In the prior art, a plastic extrusion granulation unit (publication number: CN218256104U) cools the plastic with cooling water in a cooling device. However, the temperature of the plastic strip that is just extruded from the die is high. Direct contact between the high-temperature plastic strip (usually 180-300℃) and cold water will cause the surface to shrink rapidly, while the inside is still in a high-temperature state, resulting in uneven internal stress. The excessively fast cooling rate causes the surface to harden too quickly, resulting in severe local embrittlement. The yield of the finished product after subsequent granulation cutting of the plastic strip is low. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies where plastic strips become severely brittle in certain areas after cooling, resulting in low pelletizing yield. This invention provides a cooling device and method for a plastic pelletizing machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: Cooling device for plastic granulator, including: A cooling tank, used to cool the plastic strips extruded by the extruder; A guide box is fixedly installed in a cooling pool. The guide box has a discharge channel that runs through its upper and lower surfaces. The discharge channel is used to guide the plastic strip extruded by the die head into the cooling pool. An anti-adhesion component is provided in the material feeding channel and there are multiple anti-adhesion components. The multiple anti-adhesion components are symmetrically and staggered to form a stepped buffer path. The multiple anti-adhesion components can be driven simultaneously to swing up and down.

[0006] Preferably, each of the anti-adhesion components includes a guide plate, the guide plate includes a plate body and a base, the base is fixedly installed on the inner wall of the material discharge channel, the plate body is rectangular and one side is rotatably installed in the base, each corner of the top of the guide box is provided with a first groove, the guide box is provided with a plurality of second grooves on two opposite sides, and the guide box is provided with a discharge port on the side near the bottom.

[0007] Preferably, the blanking channel is provided with an atomizing nozzle, the blanking channel is provided with a water pumping hole near the bottom, the water circulating device is arranged on the outer surface of the guide box to pump the cooling water in the cooling pool into the atomizing nozzle through the water pumping hole, and the two opposite outer surfaces of the guide box are provided with driving assemblies for driving the plurality of plate bodies to rotate simultaneously.

[0008] Preferably, the driving assembly comprises a plurality of gears and two racks, the racks are slidingly installed in corresponding first groove bodies in an up-down manner, the gears are rotatably installed in corresponding second groove bodies and are in engagement with the racks, and the rotation centers of the gears are fixedly installed with the rotation centers of the corresponding plate bodies through connecting shafts.

[0009] Preferably, the driving assembly further comprises at least one connecting rod, a first shaft body and a hydraulic telescopic rod, the connecting rod is slidingly installed on the surface of the guide box, the connecting rod is connected with the two racks through the connecting shafts, one end of the first shaft body is fixedly installed with the connecting rod, and the other end is fixedly installed with the telescopic end of the hydraulic telescopic rod, and the hydraulic telescopic rod is fixedly installed on the outer surface of the cooling pool.

[0010] Preferably, waist groove holes for avoiding the up-down sliding of the connecting shafts are formed in the surface of the guide box, and a sealing cover is detachably and fixedly installed in the open end of each first groove body and second groove body.

[0011] Preferably, the surface of each plate body is provided with a plurality of convex strips, and the surface of each convex strip is provided with an inclined surface.

[0012] Preferably, each convex strip is slidingly installed on the surface of the corresponding plate body, and the plurality of convex strips on the surface of the same plate body are connected as a whole through two second shaft bodies, and one end of each of the two second shaft bodies is fixedly installed with a rope.

[0013] Preferably, a plurality of pulleys are rotatably installed on the surface of the guide box, a third groove body for supporting the rope is formed in the surface of each base, the third groove body has an arc-shaped structure, one end of each rope passes through the outer surface of the guide box through the third groove body, and is fixed on the surface of the connecting rod after winding around the pulley.

[0014] The use method of the plastic pelletizer cooling device comprises the following steps: Step one: first, inject an appropriate amount of cooling water into the cooling pool, and start the water circulating device to lift the cooling water into the atomizing nozzle above the blanking channel; Step two: start the hydraulic telescopic rod to reciprocate and set the telescopic rate; Step three: the plastic strip after being processed by the extruder falls into the blanking channel and is preliminarily cooled by the cooling water sprayed by the atomizing nozzle. Step four: then the material is hit by reciprocating guide plate, so that it is dispersed from each other, and falls into the cooling pool for deep cooling after passing through multiple guide plates.

[0015] By setting the anti-adhesion assembly (guide plate) staggered distributed in the guide box to swing synchronously under the drive assembly, the high temperature plastic strip is repeatedly hit and dispersed in the material falling channel, effectively preventing the material from sticking during the process from the extruder to the cooling pool, and delaying falling into the cooling pool after being hit by multiple swinging plates, effectively avoiding the high temperature plastic strip directly falling into the water after being extruded from the die head, causing the surface to rapidly cool and locally severe embrittlement, and improving the finished product rate of the plastic product after cooling and cutting into particles. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure diagram of the cooling device of the plastic granulator is provided. Figure 2 The structure diagram of the cooling device of the plastic granulator is provided. Figure 3 The structure diagram of the anti-adhesion assembly of the cooling device of the plastic granulator is provided. Figure 4 The structure diagram of the anti-adhesion assembly of the cooling device of the plastic granulator is provided. Figure 3 The structure diagram of the anti-adhesion assembly of the cooling device of the plastic granulator is provided. Figure 5 The structure diagram of the anti-adhesion assembly of the cooling device of the plastic granulator is provided. Figure 6 The structure diagram of the guide plate of the cooling device of the plastic granulator is provided. Figure 7 The structure diagram of the guide plate of the cooling device of the plastic granulator is provided. Figure 8 The structure diagram of the guide plate of the cooling device of the plastic granulator is provided. Figure 7 The structure diagram of the guide plate of the cooling device of the plastic granulator is provided.

[0017] In the figure: 100, cooling pool; 200, guide box; 210, material falling channel; 220, first groove; 230, second groove; 240, discharge port; 250, water suction hole; 300, drive assembly; 310, connecting rod; 320, first shaft; 330, hydraulic telescopic rod; 340, gear; 350, rack; 400, anti-adhesion assembly; 410, guide plate; 411, plate body; 412, base; 440, protruding strip; 441, inclined surface; 450, second shaft; 460, rope; 470, pulley; 500, atomizing nozzle. DETAILED DESCRIPTION

[0018] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be further described below with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] With reference to Figure 1 and Figure 3 , the plastic pelletizer cooling device comprises a cooling pool 100, a guide box 200 is fixedly installed in the cooling pool 100, a material falling channel 210 is formed in the guide box 200 and penetrates the upper and lower surfaces of the guide box 200, the material falling channel 210 is used for guiding the plastic strip extruded by a die head to enter the cooling pool 100 for cooling, in use, the die head of the extruder is accurately aligned with the top inlet of the guide box 200 to ensure that the plastic strip falls vertically into the material falling channel 210, as shown in Figure 2 , a plurality of anti-adhesion assemblies 400 are arranged in the material falling channel 210, the plurality of anti-adhesion assemblies 400 are symmetrically and staggeredly distributed to form a stepped buffer path, each anti-adhesion assembly 400 comprises a guide plate 410, the guide plate 410 comprises a plate body 411 and a base 412, the base 412 is fixedly installed on the inner wall of the material falling channel 210, the plate body 411 is rectangular and rotatably installed on one side of the base 412, a plurality of plate bodies 411 can be simultaneously driven to reciprocate up and down, and all the plate bodies 411 are synchronously raised up to bounce and scatter the plastic strip.

[0020] By arranging a plurality of plate bodies 411 to staggeredly distribute and simultaneously reciprocate up and down, when the material falls from above the material falling channel 210, the material is delayed to fall into the cooling pool 100 after being hit by the plurality of reciprocating plate bodies 411, so that the plastic strip directly falling into water after being extruded from the die head at high temperature is effectively avoided, the surface is prevented from being rapidly cooled, and local serious embrittlement is avoided, and the plurality of plastic strips can be prevented from being bonded under the continuous bumping and hitting of the plurality of plate bodies 411.

[0021] In a specific embodiment, as shown in Figure 3 , a first groove 220 is arranged at each corner of the top of the guide box 200, a plurality of second grooves 230 are arranged on the two opposite sides of the guide box 200, and a discharge port 240 is arranged on the side close to the bottom of the guide box 200, cooling water specially used for plastic cooling is filled in the cooling pool 100, the cooling water is in a flowing and circulating state, the material falls into the cooling pool 100 below the guide box 200 for a certain time and is then fished out for the next process, or a simple conveying device can be arranged in the cooling water to move the material to the next process while being cooled.

[0022] As shown in Figure 2As shown, the blanking channel 210 is provided with an atomizing nozzle 500, and the water pressure of the atomizing nozzle is adjusted to 0.2-0.5 MPa to form fine water mist. The blanking channel 210 is provided with a water suction hole 250 near the bottom, and the outer surface of the guide box 200 is provided with a water circulation device to pump the cooling water in the cooling pool 100 into the atomizing nozzle 500 through the water suction hole 250, so that the material can be dispersed by the plate body 411 located in the upper layer and can contact a small amount of atomized cooling water. The atomized water evaporates rapidly after contacting the high-temperature plastic strip, absorbs heat, forms progressive pre-cooling, avoids sudden cooling and embrittlement, reduces the surface viscosity of the plastic strip, and reduces the risk of adhesion. The two opposite outer surfaces of the guide box 200 are provided with a driving assembly 300 for driving multiple plate bodies 411 to rotate simultaneously.

[0023] More specifically, as shown in Figure 4 The driving assembly 300 includes a plurality of gears 340 and two racks 350. The racks 350 are slidingly installed in the corresponding first grooves 220, and the gears 340 are rotatably installed in the corresponding second grooves 230 and engaged with the racks 350. The rotation center of each gear 340 is fixedly installed with the rotation center of the corresponding plate body 411 through a connecting shaft (see Figure 5 ). The plurality of gears 340 can be simultaneously driven to rotate by the upward and downward sliding of the racks 350, and the plate bodies 411 are driven to swing.

[0024] As shown in Figure 3 The driving assembly 300 further includes at least one connecting rod 310, a first shaft 320, and a hydraulic telescopic rod 330. The connecting rod 310 is slidingly installed on the surface of the guide box 200, and the connecting rod 310 is connected with the two racks 350 through a connecting shaft. The first shaft 320 is fixedly installed at one end with the connecting rod 310 and at the other end with the telescopic end of the hydraulic telescopic rod 330. The hydraulic telescopic rod 330 is fixedly installed on the outer surface of the cooling pool 100. By controlling the extension and retraction of the hydraulic telescopic rod 330, the connecting rod 310 is driven to slide up and down on the surface of the guide box 200, and the two racks 350 are driven to slide up and down in the corresponding first grooves 220. The hydraulic drive and the gear and rack transmission greatly improve the driving precision.

[0025] It should be noted that the surface of the guide box 200 is provided with a waist groove hole for avoiding the upward and downward sliding of the connecting shaft, adapting to the upward and downward sliding track of the connecting shaft, and avoiding jamming. Each first groove 220 and second groove 230 is detachably and fixedly provided with a sealing cover. The sealing cover is periodically disassembled and cleaned to remove the plastic debris remaining in the gear and rack. The hydraulic telescopic rod 330 is set to extend and retract at a frequency of 2-5 Hz to drive the plate body 411 to swing at a high frequency (amplitude 15°-30°), and the convex strip 440 is transversely displaced by 10-20 mm. The frequency of the hydraulic telescopic rod 330 is adjusted to make the plastic strip stay in the blanking channel 210 for 3-5 seconds, which is just enough to complete the preliminary cooling.

[0026] In practical application, it is found that the materials are easy to stick to each other after falling on the surface of the plate body 411 due to their own heat. Therefore, the surface of each plate body 411 is provided with a plurality of convex strips 440, and each convex strip 440 is provided with an inclined surface 441.

[0027] By arranging the convex strips 440, the materials collide with the convex strips 440 during the swinging of the plate body 411, so that the preliminarily bonded and sticky materials will bounce irregularly after being hit by the convex strips 440, reducing the opportunity for long-time contact between the materials. In combination with the inclined surface 441, the bounced materials are more likely to be dispersed and fall on the surface of the plate body 411 below, effectively avoiding the bonding between the materials.

[0028] Due to the gaps between the plurality of convex strips 440 on the surface of the same plate body 411, some materials inevitably fall into the gaps and are not conducive to moving to the plate body 411 below.

[0029] In order to make the materials move downward more smoothly, as shown in Figure 7 , each convex strip 440 is slidingly installed on the surface of the corresponding plate body 411, and the plurality of convex strips 440 can be driven to simultaneously reciprocate on the surface of the plate body 411.

[0030] In a specific scheme, as shown in Figure 7 , the plurality of convex strips 440 on the surface of the same plate body 411 are connected as a whole by two second shaft bodies 450, and each second shaft body 450 is fixedly installed with a rope 460 near one end of the base 412.

[0031] As shown in Figure 3 and Figure 4 , a plurality of pulleys 470 are rotatably installed on the surface of the material guide box 200, and each base 412 is provided with a third groove (see Figure 6 ) for supporting the rope 460. The third groove is in an arc shape, one end of each rope 460 passes through the third groove and the outer surface of the material guide box 200, winds around the pulley 470, and is fixed to the surface of the connecting rod 310 (see Figure 4 and Figure 5 ), as shown in Figure 3 , at this time, the number of connecting rods 310 is consistent with the number of plate bodies 411, and the first shaft body 320 is fixedly installed with the plurality of connecting rods 310.

[0032] It should be noted that the convex strip 440 is made of a material with high density, high temperature resistance and corrosion resistance, such as stainless steel, and the convex strip 440 can only slide left and right along the surface of the plate body 411 (see Figure 2 ).

[0033] The second shaft body 450 is connected with the connecting rod 310 through the setting of the rope 460, when the connecting rod 310 is driven to slide down along the surface of the material guide box 200, the rack 350 moves downwards to drive the corresponding gear 340 to rotate counterclockwise, and then drives one end of the plate body 411 to swing upwards to impact the material, at this time, under the pulling of the rope 460, the plurality of convex strips 440 on the surface of the plate body 411 slide along the surface of the plate body 411 to the direction close to the inner wall of the material falling channel 210 along with the two second shaft bodies 450, when the connecting rod 310 is driven to reset, the plurality of convex strips 440 are reset under the action of their own gravity, so as to realize the swing of the plate body 411 and the left and right sliding state of the convex strips 440 on the surface of the plate body 411, the vertical compound motion of the swing of the plate body 411 and the sliding of the convex strips 440 is formed, the plastic strip is transversely pushed by the convex strips 440 in the bouncing process, the adhering material is completely separated, and the material is prevented from being clamped into the gap between the convex strips 440, so that the material can be more dispersed and preliminarily cooled before entering the cooling pool 100.

[0034] The use method of the plastic pelletizing machine cooling device adopts the plastic pelletizing machine cooling device in the above scheme, the die head of the extruder is arranged directly above the material guide box 200, so that the high-temperature extruded material is dispersed and preliminarily cooled before entering the cooling pool 100, and the direct contact of the just-extruded high-temperature material with cooling water is effectively avoided to prevent the material surface from being embrittled.

[0035] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A cooling device for a plastic pelletizer, characterized by, The utility model relates to a plastic strip cooling device, including: a cooling pool (100) for cooling plastic strips extruded by an extruder; a material guide box (200) fixedly installed in the cooling pool (100), the material guide box (200) being provided with a material falling channel (210) penetrating through its upper and lower surfaces, the material falling channel (210) being used to guide plastic strips extruded by a die head into the cooling pool (100); anti-sticking assemblies (400) arranged in the material falling channel (210) and symmetrically staggered, forming a stepped buffer path, the anti-sticking assemblies (400) being simultaneously driven to swing up and down.

2. The plastic pellet cooler as claimed in claim 1, wherein Each anti-sticking assembly (400) includes a material guide plate (410) including a plate body (411) and a base (412), the base (412) being fixedly installed on the inner wall of the material falling channel (210), the plate body (411) being rectangular and rotatably installed on one side of the base (412), the material guide box (200) being provided with first groove bodies (220) at each corner of the top thereof, the material guide box (200) being provided with a plurality of second groove bodies (230) on two opposite sides thereof, and the material guide box (200) being provided with a discharge port (240) near one side of the bottom thereof.

3. The plastic pellet cooler as claimed in claim 2, wherein The material falling channel (210) is provided with an atomizing nozzle (500), the material falling channel (210) being provided with a water suction hole (250) near the bottom thereof, the outer surface of the material guide box (200) being provided with a water circulation device for pumping cooling water in the cooling pool (100) into the atomizing nozzle (500) through the water suction hole (250), and the two opposite outer surfaces of the material guide box (200) being provided with driving assemblies (300) for simultaneously driving a plurality of plate bodies (411) to rotate.

4. The plastic pellet cooler as claimed in claim 3, wherein The driving assembly (300) includes a plurality of gears (340) and two racks (350), the racks (350) being slidingly installed in corresponding first groove bodies (220), the gears (340) being rotatably installed in corresponding second groove bodies (230) and engaged with the racks (350), and the rotation centers of the gears (340) being fixedly installed with the rotation centers of corresponding plate bodies (411) through connecting shafts.

5. The plastic pellet cooler as claimed in claim 4, wherein The driving assembly (300) further includes at least one connecting rod (310), a first shaft body (320), and a hydraulic telescopic rod (330), the connecting rod (310) being slidingly installed on the surface of the material guide box (200), the connecting rod (310) being connected with the two racks (350) through connecting shafts, one end of the first shaft body (320) being fixedly installed with the connecting rod (310) and the other end being fixedly installed with the telescopic end of the hydraulic telescopic rod (330), and the hydraulic telescopic rod (330) being fixedly installed on the outer surface of the cooling pool (100).

6. The plastic pellet cooler as claimed in claim 5, wherein The surface of the material guide box (200) is provided with waist groove holes for avoiding the up-and-down sliding of the connecting shafts, and each first groove body (220) and second groove body (230) is detachably fixedly installed with a sealing cover.

7. The plastic pellet cooler as claimed in claim 2, wherein The surface of each plate body (411) is provided with a plurality of convex strips (440), and the surface of each convex strip (440) is provided with an inclined surface (441).

8. The plastic pellet cooler as claimed in claim 7, wherein Each convex strip (440) is slidingly installed on the surface of a corresponding plate body (411), and the plurality of convex strips (440) on the surface of the same plate body (411) are connected as a whole by two second shaft bodies (450), and the two second shaft bodies (450) are fixedly installed with a rope (460) at one end close to the base (412).

9. The plastic pellet cooler as claimed in claim 8, wherein, A plurality of pulleys (470) are rotatably installed on the surface of the material guide box (200), each base (412) is provided with a third groove for supporting the rope (460), the third groove is in an arc shape, one end of each rope (460) passes through the third groove, passes through the outer surface of the material guide box (200), and is fixed on the surface of the connecting rod (310) after winding around the pulley (470).

10. The use of the plastic pelletizer cooling device of claim 9.

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