An extruder for producing polypropylene PP particles

Abstract

The present invention relates to the technical field of preforming of granular products, in particular to an extruder for producing polypropylene (PP) granules, comprising: an extruder body, an extrusion channel arranged on the extruder body, a twin screw rod arranged on the extruder body and located in the extrusion channel, an extrusion head installed at the end of the extrusion channel, a cross column installed on the extruder body and located in front of the extrusion channel, a defoaming part arranged on the cross column and the extrusion channel, and a quick cooling and solidification part arranged on the side of the extruder body and close to the extrusion head. After the twin screw rods extrude molten polypropylene, sufficient high-frequency vibration is performed inside the polypropylene, so that bubbles in the molten polypropylene are destroyed by utilizing the high-frequency and micro-amplitude vibration effect, thereby achieving the purpose of removing bubbles.

Description

Technical Field

[0001] The invention relates to the technical field of granule product preforming, in particular to an extruder for producing polypropylene (PP) granules. Background Art

[0002] Polypropylene (PP for short) is a semi-crystalline thermoplastic polymer made from propylene monomer by addition polymerization. Polypropylene is colorless, odorless, tasteless and non-toxic. It is the lightest of the commonly used resins. It is widely used in the production of plastic products due to its excellent mechanical properties, including tensile strength, compressive strength and hardness, outstanding rigidity and bending fatigue resistance, good heat resistance, stable chemical properties, excellent electrical insulation properties, etc.

[0003] In actual application, polypropylene often needs to be granulated to improve its physical properties and application value. Specifically, granulating polypropylene can better maintain its stability, granulated polypropylene is easy to transport and store, and is easier to measure during processing. The size and shape of the particles are uniform, and the quality of the products produced is more stable, etc.

[0004] At present, the extruder commonly used in the production process of polypropylene particles is a twin-screw extruder. The twin-screw extruder has the advantages of enabling the material to be more fully sheared, stretched and mixed during the extrusion process, thereby improving the uniformity and quality stability of the product. The molten polypropylene is extruded into filamentary or ribbon-shaped materials under the action of the twin-screw extruder to form a preform for making particles, and then the preformed material is cut into particles by a pelletizer to form the required polypropylene particles. However, the existing extruders have some defects and shortcomings:

[0005] The extruder heats the polypropylene to make it molten. Therefore, bubbles are very likely to appear when the extruder extrudes the polypropylene from the extrusion port, resulting in bubbles in the extruded material. Once bubbles appear, the density and strength of the material will be reduced, affecting its mechanical properties. It will also affect the appearance of the material, such as rough and uneven surface, and ultimately affect the overall quality of the granular product.

[0006] The material just extruded by the extruder is still molten, so it must be cooled and solidified before it can be smoothly cut into pellets. However, the existing extruders have poor cooling efficiency for materials and require a long cooling route. The excessively long cooling distance causes the molten and semi-molten materials to be exposed for a long time, so various impurities are easily attached to the materials. The presence of impurities will reduce the purity of the polypropylene particles, affect their performance in subsequent processing and applications, or cause black spots, affect the appearance quality, and cause the physical and chemical properties of the polypropylene particles to be comprehensively affected. Summary of the invention

[0007] The object of the present invention is to provide an extruder for producing polypropylene PP particles to solve the above problems.

[0008] In order to achieve the above-mentioned object, the present invention provides an extruder for producing polypropylene PP particles, comprising: an extruder body, an extrusion channel arranged on the extruder body, a twin screw arranged on the extruder body and located in the extrusion channel, an extrusion head installed at the end of the extrusion channel, a horizontal column installed on the extruder body and located in front of the extrusion channel, a defoaming part arranged on the horizontal column and the extrusion channel, and a rapid cooling and curing part arranged on the side of the extruder body and close to the extrusion head;

[0009] The defoaming section is located behind the twin screws, wherein:

[0010] The debubbling part is suitable for eliminating bubbles in the molten polypropylene multiple times between the twin screw and the extruder head;

[0011] The rapid cooling and solidification section is suitable for sequentially cooling the extruded material with a variety of refrigerants to rapidly solidify and shape the extruded material.

[0012] Further, the debubble part includes a cylinder arranged on the horizontal column, a through slot provided on the side wall of the extrusion channel, two ear plates installed on the outer side wall of the extrusion channel and respectively located on both sides of the through slot, a round rod rotatably installed between the two ear plates, two connecting members interspersed on the round rod at intervals, two vibrating rods respectively connected to the front ends of the two connecting members, and an arm plate connected to the rear ends of the two connecting members, and the arm plate is connected to the output end of the cylinder;

[0013] The two vibration rods extend into the extrusion channel and are close to the ends of the twin screws.

[0014] Furthermore, the debubble part also includes a plate body fitted in the extrusion channel and located behind the two vibrating rods, a plurality of rows of holes arranged in an array on the plate body, two first motors installed on the extrusion channel and respectively located on both sides of the plate body, two first shafts rotatably installed in the extrusion channel and extending upwardly out of the extrusion channel, and two push pieces respectively connected to the two first shafts, and the two push pieces are respectively fitted to the two inner side walls of the extrusion channel;

[0015] The two push pieces are located between the twin screws and the plate body;

[0016] The output ends of the two first motors are connected to the two first shafts respectively.

[0017] Further, the defoaming part also includes a bearing mounted on the extrusion channel, a second shaft mounted on the bearing and extending into the extrusion channel, a plurality of side rods mirror-connected to the second shaft, a plurality of spike rods horizontally mounted on the plurality of side rods, a first support arm mounted on the cross column, and a second motor mounted at the tail of the first support arm, and the output end of the second motor is connected to the second shaft;

[0018] A plurality of spike rods are located between the plate body and the extrusion head.

[0019] Further, the rapid cooling and curing part includes a platform and a liquid storage barrel located on one side of the extruder body, a hollow slot plate arranged on the platform, a water tank installed in the hollow slot plate, and one end of the water tank extends obliquely upward close to the extruder head, a cover hinged on the water tank, a water pump arranged on the liquid storage barrel, a first pipe with one end connected to the hollow slot plate and the other end connected to the water outlet of the water pump, a second pipe passing through the platform and connected to the bottom of the hollow slot plate, two first rotating rods respectively installed on both ends of the horizontal part of the water tank, and two second rotating rods installed side by side on the side of the water tank;

[0020] The water inlet of the water pump is inserted into the liquid storage barrel through a connecting pipe;

[0021] Cooling liquid is stored in the liquid storage barrel.

[0022] Furthermore, the rapid cooling and curing unit further comprises a frame and a refrigerator arranged on the platform, a rectangular screen installed on the top of the frame, a partition centrally installed in the frame, a cylinder installed at the outlet of the refrigerator, a fan arranged on the cylinder, and a long channel and a short channel, one end of which is connected to the cylinder and the other end is inserted into the frame, and the insertion ends of the long channel and the short channel are respectively located at the front and rear sides of the partition;

[0023] The two second rotating rods are flush with the rectangular leakage net.

[0024] Furthermore, a hollow box is provided on the long channel, and a heating wire is rotatably provided inside the hollow box;

[0025] The heating wire is connected to an external power source.

[0026] Further, the rapid cooling and curing unit further includes a second support arm mounted on the back of the frame, a grille air outlet hinged to the second support arm, a delivery pipe with one end arranged at the insertion end of the short channel, and the delivery pipe extending outward from the frame, and a gooseneck pipe with one end connected to the delivery pipe and the other end connected to the grille air outlet;

[0027] The grille air outlet is located behind the partition.

[0028] Further, the connecting member includes a flat plate inserted into the round rod, and a damper installed at the front end of the flat plate;

[0029] The tail of the vibration rod is connected to the damper.

[0030] Furthermore, the two vibrating rods are provided with elastic sheets, and the elastic sheets are installed at the through grooves;

[0031] The bottom surface of the part of the water tank that extends obliquely upward is coated with a polytetrafluoroethylene film.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The extruder for producing polypropylene PP particles can fully vibrate at high frequency inside the polypropylene after the twin-screw extruder extrude the molten polypropylene through the debubbling part, so as to destroy the bubbles in the molten polypropylene by the high-frequency and slight vibration, thereby achieving the purpose of removing bubbles;

[0034] The extruder for producing polypropylene PP particles can continuously stir the polypropylene with a large number of sharp ends before the extruder extrudes the molten polypropylene in the form of filaments, thereby destroying the bubbles in the polypropylene with the sharp ends, and removing the bubbles in the polypropylene again;

[0035] The extruder for producing polypropylene PP particles can cool the material in two different ways, namely, water cooling and low-temperature air cooling, immediately after the filamentary material is extruded from the extruder head through the rapid cooling and solidification part, thereby effectively improving the cooling efficiency and shortening the cooling route. In addition, the rapid cooling and solidification part can well protect the filamentary material during the period when the filamentary material is just extruded, thereby avoiding exposure of the material still in a molten state as much as possible, thereby effectively preventing the physical and chemical properties of the subsequently produced polypropylene particles from being affected due to impurities adhering to the material.

[0036] The rapid cooling and solidification part of the extruder for the production of polypropylene PP particles adopts a step-by-step cooling method for the material, so that the cooling intensity increases from low to high, thereby ensuring excellent cooling efficiency while ensuring that the material is steadily cooled and solidified to prevent the material temperature from suddenly dropping sharply, causing stress concentration or reducing its own crystallinity and affecting the mechanical properties;

[0037] The extruder for producing polypropylene PP particles has optimized the extrusion process of filamentous polypropylene in a targeted manner, and comprehensively improved the quality of the output preforms used for making polypropylene particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0039] Figure 1 A perspective view of the present invention is shown;

[0040] Figure 2 A second perspective view of the present invention is shown;

[0041] Figure 3 A third perspective view of the present invention is shown;

[0042] Figure 4 shows a fourth perspective view of the present invention;

[0043] Figure 5 A fifth perspective view of the present invention is shown;

[0044] Figure 6 A sixth perspective view of the present invention is shown;

[0045] Figure 7 A seventh perspective view of the present invention is shown;

[0046] Figure 8 An eighth perspective view of the present invention is shown;

[0047] Fig. 9 The present invention is shown Figure 4 A magnified image of point A;

[0048] Fig.10 The present invention is shown Figure 5 A magnified view of point B;

[0049] Fig.11 The present invention is shown Figure 6 Enlarged view of point C;

[0050] Fig.12 The present invention is shown Figure 7 Enlarged view of point D.

[0051] In the figures, the same reference numerals denote the same structural elements, wherein:

[0052] 1. Extruder body; 2. Extrusion channel; 3. Twin screw; 4. Extrusion head; 5. Horizontal column; 6. Defoaming part; 61. Cylinder; 62. Ear plate; 63. Round rod; 64. Connector; 641. Flat plate; 642. Damper; 65. Vibrating rod; 651. Elastic sheet; 66. Arm plate; 67. Plate body; 68. Row of holes; 69. First motor; 691. First shaft rod; 692. Push plate; 693. Bearing; 694. Second shaft rod; 695. Side rod; 696. Spiked rod; 697. First support arm; 698. Second motor; 7. Quick cooling Curing unit; 71, platform; 72, liquid storage barrel; 73, hollow trough plate; 74, water tank; 75, cover; 76, water pump; 77, first pipeline; 78, second pipeline; 79, first rotating rod; 791, second rotating rod; 792, frame; 793, refrigerator; 794, rectangular filter; 795, partition; 796, cylinder; 797, fan; 798, long channel; 799, short channel; 7991, second support arm; 7992, grid air outlet; 7993, delivery pipe; 7994, gooseneck; 8, hollow box; 9, heating wire. DETAILED DESCRIPTION

[0053] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0054] like Figure 1-12 As shown, an extruder for producing polypropylene PP particles comprises: an extruder body 1, an extrusion channel 2 arranged on the extruder body 1, a twin screw 3 arranged on the extruder body 1 and located in the extrusion channel 2, an extrusion head 4 installed at the end of the extrusion channel 2, a horizontal column 5 installed on the extruder body 1 and located in front of the extrusion channel 2, a defoaming part 6 arranged on the horizontal column 5 and the extrusion channel 2, and a quick cooling and curing part 7 arranged on the side of the extruder body 1 and close to the extrusion head 4;

[0055] The debubbling section 6 is located behind the twin screw 3, wherein:

[0056] The debubbling part 6 is suitable for eliminating bubbles in the molten polypropylene multiple times between the twin screw 3 and the extruder head 4;

[0057] The rapid cooling and solidifying section 7 is suitable for sequentially cooling the extruded material with a variety of refrigerants to rapidly solidify and form it. The extruder for producing polypropylene PP particles can fully vibrate at high frequencies inside the polypropylene after the twin screw 3 extrude the molten polypropylene through the debubbling section 6, thereby utilizing the high-frequency and slight vibration to destroy the bubbles in the molten polypropylene, thereby achieving the purpose of removing the bubbles. The debubbling section 6 can be used to continuously stir the polypropylene again with a large number of sharp ends before the extrusion head 4 extrude the molten polypropylene in the form of filaments, thereby utilizing the large number of moving sharp ends to destroy the bubbles inside the polypropylene, and then perform a round of removal of the bubbles inside the polypropylene. The rapid cooling and solidifying section 7 can be used to sequentially cool the material in two different ways, namely, water cooling and low-temperature air cooling, immediately after the extrusion head 4 extrude the filamentary material. The rapid cooling and solidification section 7 is used for the treatment of the filamentary material, thereby effectively improving the cooling efficiency and shortening the cooling route. The rapid cooling and solidification section 7 can protect the filamentary material well during the period when the filamentary material has just been extruded, thereby avoiding exposure of the molten material as much as possible, and effectively preventing the physical and chemical properties of the subsequently produced polypropylene particles from being affected by the attachment of impurities to the material. The rapid cooling and solidification section 7 adopts a step-by-step cooling method for the material, so that the cooling intensity increases from low to high, thereby ensuring excellent cooling efficiency while ensuring that the material is steadily cooled and solidified to form, so as to prevent the material temperature from suddenly dropping sharply, causing stress concentration or reducing its own crystallinity and affecting the mechanical properties. The extruder for the production of polypropylene PP particles optimizes the extrusion process of the filamentary polypropylene in a targeted manner, and comprehensively improves the quality of the output preforms for making polypropylene particles.

[0058] Optionally, the debubble part 6 includes a cylinder 61 arranged on the horizontal column 5, a through slot provided on the side wall of the extrusion channel 2, two ear plates 62 installed on the outer side wall of the extrusion channel 2 and respectively located on both sides of the through slot, a round rod 63 rotatably installed between the two ear plates 62, two connecting members 64 interspersed on the round rod 63 at intervals, two vibrating rods 65 respectively connected to the front ends of the two connecting members 64, and an arm plate 66 connected to the rear ends of the two connecting members 64, and the arm plate 66 is connected to the output end of the cylinder 61, and the vibrating rod 65 is an existing machine for tamping, which can generate vibration waves;

[0059] The two vibrating rods 65 extend into the extrusion channel 2 and are close to the ends of the twin screws 3. The two vibrating rods 65 are started to make them start high-frequency micro-vibration. After the twin screws 3 extrude the molten polypropylene, the polypropylene is immediately affected after contacting the two vibrating rods 65, so that the bubbles are continuously destroyed inside the polypropylene by the vibration of the two vibrating rods 65, so as to achieve the purpose of removing the bubbles. When the two vibrating rods 65 are started, the cylinder 61 is driven to pull the arm plate 66 up and down, so that the two vibrating rods 65 in front are shaken up and down in the extrusion channel 2 through the round rod 63, so that it is continuously The arm plate 66 moves in an arc-shaped trajectory under the action of the round rod 63, and the connection between the arm plate 66 and the cylinder 61 ensures that the output force of the cylinder 61 can be normally transmitted to the arm plate 66 so that the two vibrating rods 65 can swing up and down, while leaving a certain amount of activity space for the arm plate 66 to prevent the thrust of the cylinder 61 from obstructing the movement path of the arm plate 66; under the action of the two vibrating rods 65, the molten polypropylene is tamped again after the twin screw 3, thereby promoting the mixing of various raw materials and improving the quality of the finally extruded filamentary material.

[0060] Optionally, the debubble part 6 also includes a plate body 67 fitted in the extrusion channel 2 and located behind the two vibrating rods 65, a plurality of rows of holes 68 arranged in an array on the plate body 67, two first motors 69 installed on the extrusion channel 2 and respectively located on both sides of the plate body 67, two first shafts 691 rotatably installed in the extrusion channel 2 and extending upwardly out of the extrusion channel 2, and two push pieces 692 respectively connected to the two first shafts 691, and the two push pieces 692 are respectively fitted to the two inner side walls of the extrusion channel 2;

[0061] The two push pieces 692 are located between the twin screws 3 and the plate body 67;

[0062] The output ends of the two first motors 69 are connected to the two first shafts 691 respectively. When the twin screws 3 continuously extrude the molten polypropylene, the molten polypropylene can only flow backward through the row holes 68 on the plate 67 due to the obstruction of the plate 67, thereby controlling the flow rate of the molten polypropylene or making it accumulate in a small amount between the plate 67 and the twin screws 3, thereby ensuring that the molten polypropylene can be vibrated by the two vibration rods 65 for a longer time and more fully, thereby improving the defoaming effect and preventing the molten polypropylene from In order to prevent the olefin from flowing away too quickly in the extrusion channel 2 and affecting the degree of defoaming of the vibrating rod 65, the two first motors 69 are driven to respectively drive the two push pieces 692 to rotate toward the plate body 67, so that the two push pieces 692 are used to push the molten polypropylene toward the plate body 67, forcing it to flow backward through the row holes 68 on the plate body 67 to accelerate the flow of the molten polypropylene. The two first motors 69 are driven regularly to periodically press the polypropylene to prevent excessive accumulation of polypropylene from affecting the normal discharge of the twin screw 3.

[0063] Optionally, the debubble section 6 further includes a bearing 693 mounted on the extrusion channel 2, a second shaft 694 mounted on the bearing 693 and extending into the extrusion channel 2, a plurality of side rods 695 mirror-connected to the second shaft 694, a plurality of spike rods 696 horizontally mounted on the plurality of side rods 695, a first support arm 697 mounted on the cross column 5, and a second motor 698 mounted at the tail of the first support arm 697, and the output end of the second motor 698 is connected to the second shaft 694;

[0064] A number of the spiked rods 696 are located between the plate body 67 and the extrusion head 4, and drive the second motor 698 to drive the second shaft 694 to rotate, so that a large number of spiked rods 696 are used to move and pierce inside the molten polypropylene, and the remaining bubbles are used to destroy them again, thereby further improving the degassing effect, ensuring that the degassing is as thorough as possible, and improving the overall quality of the polypropylene particles finally produced.

[0065] Optionally, the rapid cooling and curing part 7 includes a platform 71 and a liquid storage barrel 72 located on one side of the extruder body 1, a hollow slot plate 73 arranged on the platform 71, a water tank 74 fitted and installed in the hollow slot plate 73, and one end of the water tank 74 extends obliquely upward close to the extruder head 4, a cover 75 hinged on the water tank 74, a water pump 76 arranged on the liquid storage barrel 72, a first pipe 77 with one end connected to the hollow slot plate 73 and the other end connected to the water outlet of the water pump 76, a second pipe 78 passing through the platform 71 and connected to the bottom of the hollow slot plate 73, two first rotating rods 79 respectively installed at both ends of the horizontal part in the water tank 74, and two second rotating rods 791 installed side by side on the side of the water tank 74;

[0066] The water inlet of the water pump 76 is inserted into the liquid storage barrel 72 through a pipe;

[0067] The liquid storage barrel 72 stores cooling liquid. When the filamentary material starts to be extruded, the filamentary material is first passed around the bottom of the two first rotating rods 79 and between the two second rotating rods 791 in sequence. After the filamentary material is placed on the rectangular sieve 794, the end of the filamentary material is connected to the winding mechanism to wind up the produced filamentary material, or the filamentary material is directly passed into the cutting machine for direct pelletizing. After the filamentary material is arranged, the cover 75 is closed to protect the material to avoid the molten material just extruded from the extruder 4 from being completely exposed, and to specifically protect the material at the stage where it is easy to be contaminated with impurities, so as to effectively prevent various impurities from adhering to the material; the water tank 74 is filled with water, and the material passes through the water, so as to preliminarily cool the material in a water-cooling manner; the hollow slot plate 73 The hollow groove plate 73 is filled with coolant. When the heat of the material is transferred to the water in the water groove 74, the coolant is used for heat exchange to replace the heat contained in the water, thereby ensuring the continuity of the cooling effect of the water in the water groove 74 to prevent the water temperature from rising too much due to the long-term continuous movement of the material, which greatly reduces the cooling effect. Under normal circumstances, the second pipeline 78 is closed, the water pump 76 is started at a fixed time and the second pipeline 78 is opened. The water pump 76 draws the coolant in the liquid storage barrel 72 into the hollow groove plate 73, and the second pipeline 78 discharges the original coolant in the hollow groove plate 73 to realize the circulation of the coolant in the hollow groove plate 73. The coolant in the hollow groove plate 73 is replaced regularly to ensure the heat exchange effect of the coolant in the hollow groove plate 73.

[0068] Optionally, the rapid cooling and curing unit 7 further includes a frame 792 and a refrigerator 793 arranged on the platform 71, a rectangular filter 794 installed on the top of the frame 792, a partition 795 centrally installed in the frame 792, a cylinder 796 installed at the outlet of the refrigerator 793, a fan 797 arranged on the cylinder 796, and a long channel 798 and a short channel 799, both of which are connected to the cylinder 796 at one end and inserted into the frame 792 at the other end, and the insertion ends of the long channel 798 and the short channel 799 are respectively located at the front and rear sides of the partition 795;

[0069] The two second rotating rods 791 are flush with the rectangular mesh 794. After the refrigerator 793 is started, its outlet begins to produce cold air, and then the fan 797 blows the cold air forward, allowing the cold air to quickly penetrate into the long channel 798 and the short channel 799. Then the long channel 798 and the short channel 799 discharge the cold air into the frame 792. The cold air passes through the rectangular mesh 794 and acts on the material, thereby using a lower temperature cooling source to cool the material, effectively improving the cooling efficiency, shortening the required cooling route, and prompting the material to solidify and shape faster while effectively reducing the exposure time of the material and reducing the risk of contamination by impurities.

[0070] Optionally, a hollow box 8 is provided on the long channel 798, and a heating wire 9 is rotatably provided inside the hollow box 8;

[0071] The heating wire 9 is connected to an external power supply, and the heating wire 9 is energized to start heating, so that the cold air is heated when it passes through the long channel 798, so that the temperature of the cold air is increased to a certain extent, ensuring that it is different from the temperature of the cold air discharged from the short channel 799, and the interior of the frame 792 is divided into two sections under the separation of the partition 795, so that the material is cooled by the water in the water tank 74, the cold air discharged from the long channel 798 and the cold air discharged from the short channel 799 in turn, so as to achieve step-by-step cooling, so that the cooling intensity is from low to high, and while ensuring excellent cooling efficiency, the material is steadily cooled and solidified to prevent the temperature of the material from suddenly dropping sharply, causing stress concentration or reducing its own crystallinity and affecting the mechanical properties; after the heating wire 9 heats the cold air, the airflow discharged from the long channel 798 will be drier, so that the moisture on the material can be removed more quickly, so that it can be solidified faster; the heating wire 9 can also be replaced by other low-temperature heat sources to ensure that the cold air passing through the long channel 798 can be slightly heated.

[0072] Optionally, the rapid cooling and curing unit 7 further includes a second support arm 7991 installed on the back of the frame 792, a grille air outlet 7992 hinged to the second support arm 7991, a delivery pipe 7993 with one end arranged at the insertion end of the short channel 799, and the delivery pipe 7993 extends outward from the frame 792, and a gooseneck pipe 7994 with one end connected to the delivery pipe 7993 and the other end connected to the grille air outlet 7992;

[0073] The grid air outlet 7992 is located at the rear of the partition 795, and the conveying pipe 7993 draws away part of the cold air discharged from the short channel 799, and passes into the grid air outlet 7992 through the gooseneck pipe 7994. The grid air outlet 7992 is used to discharge the cold air downward, so that the material on the rectangular filter 794 is surrounded by the cold air in three dimensions, ensuring the cooling efficiency of the material; by bending the grid air outlet 7992, the direction of the grid air outlet 7992 can be adjusted under the hinge between the grid air outlet 7992 and the second support arm 7991, ensuring that the grid air outlet 7992 faces the material below and blows the cold air directly to the material.

[0074] Optionally, the connecting member 64 includes a flat plate 641 inserted into the round rod 63, and a damper 642 installed at the front end of the flat plate 641;

[0075] The tail of the vibration rod 65 is connected to the damper 642. The damper 642 is used to continuously absorb the vibration generated by the vibration rod 65 when it is working, thereby blocking the vibration propagation of the vibration rod 65 as much as possible and preventing the vibration force from affecting other devices.

[0076] Optionally, an elastic sheet 651 is provided on the two vibrating rods 65, and the elastic sheet 651 is installed at the through groove. When the two vibrating rods 65 swing up and down, the elastic sheet 651 is pulled, so that the through groove is blocked with the help of the elastic sheet 651 without hindering the normal up and down swinging of the two vibrating rods 65, ensuring that the sealing of the side of the extrusion channel 2 is maintained during the extrusion process, and preventing the molten material in the extrusion channel 2 from leaking;

[0077] The bottom surface of the obliquely upward extending portion of the water trough 74 is coated with a polytetrafluoroethylene film. Polytetrafluoroethylene has high smoothness. The polytetrafluoroethylene film is used to make the bottom surface of the obliquely upward extending portion of the water trough 74 extremely smooth to prevent the newly extruded filamentous material from sticking to the water trough 74.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An extruder for producing polypropylene PP particles, characterized in that: include: An extruder body (1), an extrusion channel (2) arranged on the extruder body (1), a twin screw (3) arranged on the extruder body (1) and located in the extrusion channel (2), an extrusion head (4) installed at the end of the extrusion channel (2), a horizontal column (5) installed on the extruder body (1) and located in front of the extrusion channel (2), a defoaming portion (6) arranged on the horizontal column (5) and the extrusion channel (2), and a rapid cooling and solidification portion (7) arranged on the side of the extruder body (1) and close to the extrusion head (4); The defoaming section (6) is located behind the twin screw (3); The debubbling section (6) is suitable for eliminating bubbles in the molten polypropylene multiple times between the twin screw (3) and the extruder head (4); The rapid cooling and solidification section (7) is suitable for sequentially cooling the extruded material with a plurality of refrigerants to solidify the extruded material into a shape; The defoaming section (6) comprises a cylinder (61) arranged on the horizontal column (5), a through slot provided on the side wall of the extrusion channel (2), two ear plates (62) installed on the outer side wall of the extrusion channel (2) and respectively located on both sides of the through slot, a round rod (63) rotatably installed between the two ear plates (62), two connecting members (64) interlaced on the round rod (63), two vibrating rods (65) respectively connected to the front ends of the two connecting members (64), and an arm plate (66) connected to the rear ends of the two connecting members (64), and the arm plate (66) is connected to the output end of the cylinder (61); The two vibration rods (65) extend into the extrusion channel (2) and are close to the ends of the twin screws (3); The debubble section (6) further comprises a plate body (67) fitted in the extrusion channel (2) and located behind the two vibrating rods (65), a plurality of rows of holes (68) arranged in an array on the plate body (67), two first motors (69) fitted on the extrusion channel (2) and respectively located on both sides of the plate body (67), two first shafts (691) rotatably fitted in the extrusion channel (2) and extending upwardly out of the extrusion channel (2), and two push pieces (692) respectively connected to the two first shafts (691), and the two push pieces (692) are respectively fitted in the two inner side walls of the extrusion channel (2); The two push pieces (692) are located between the twin screws (3) and the plate body (67); The output ends of the two first motors (69) are respectively connected to the two first shafts (691); The debubble section (6) further comprises a bearing (693) mounted on the extrusion channel (2), a second shaft (694) mounted on the bearing (693) and extending into the extrusion channel (2), a plurality of side rods (695) mirror-connected to the second shaft (694), a plurality of spike rods (696) horizontally mounted on the plurality of side rods (695), a first support arm (697) mounted on the crossbar (5), and a second motor (698) mounted at the tail of the first support arm (697), wherein the output end of the second motor (698) is connected to the second shaft (694); The plurality of spike rods (696) are located between the plate body (67) and the extrusion head (4).

2. The extruder for producing polypropylene PP particles according to claim 1, characterized in that: The rapid cooling and solidification section (7) comprises a platform (71) and a liquid storage barrel (72) located on one side of the extruder body (1), a hollow slot plate (73) arranged on the platform (71), a water tank (74) fitted and installed in the hollow slot plate (73), and one end of the water tank (74) extends obliquely upward close to the extruder head (4), a cover (75) hinged on the water tank (74), a water pump (76) arranged on the liquid storage barrel (72), a first pipe (77) with one end connected to the hollow slot plate (73) and the other end connected to the water outlet of the water pump (76), a second pipe (78) passing through the platform (71) and connected to the bottom of the hollow slot plate (73), two first rotating rods (79) respectively installed at both ends of the horizontal part in the water tank (74), and two second rotating rods (791) installed side by side on the side of the water tank (74); The water inlet of the water pump (76) is inserted into the liquid storage barrel (72) through a connecting pipe; The liquid storage barrel (72) stores cooling liquid.

3. The extruder for producing polypropylene PP particles as claimed in claim 2, characterized in that: The rapid cooling and solidification section (7) further comprises a frame (792) and a refrigerator (793) arranged on the platform (71), a rectangular screen (794) installed on the top of the frame (792), a partition (795) centrally installed in the frame (792), a cylinder (796) installed at the outlet of the refrigerator (793), a fan (797) arranged in the cylinder (796), and a long channel (798) and a short channel (799) both of which are connected to the cylinder (796) at one end and inserted into the frame (792) at the other end, and the insertion ends of the long channel (798) and the short channel (799) are respectively located at the front and rear sides of the partition (795); The two second rotating rods (791) are flush with the rectangular leakage net (794).

4. The extruder for producing polypropylene PP particles as claimed in claim 3, characterized in that: A hollow box (8) is disposed on the long channel (798), and a heating wire (9) is rotatably disposed inside the hollow box (8); The heating wire (9) is connected to an external power source.

5. The extruder for producing polypropylene PP particles as claimed in claim 4, characterized in that: The rapid cooling and curing section (7) further comprises a second support arm (7991) mounted on the back of the frame (792), a grille air outlet (7992) hingedly connected to the second support arm (7991), a delivery pipe (7993) having one end disposed at the insertion end of the short channel (799), the delivery pipe (7993) extending outward from the frame (792), and a gooseneck pipe (7994) having one end connected to the delivery pipe (7993) and the other end connected to the grille air outlet (7992); The grille air outlet (7992) is located behind the partition (795).

6. The extruder for producing polypropylene PP particles as claimed in claim 5, characterized in that: The connecting member (64) comprises a flat plate (641) inserted into the round rod (63), and a damper (642) mounted on the front end of the flat plate (641); The tail of the vibration rod (65) is connected to the damper (642).

7. The extruder for producing polypropylene PP particles according to claim 6, characterized in that: The two vibrating rods (65) are provided with elastic sheets (651), and the elastic sheets (651) are installed at the through grooves; A polytetrafluoroethylene film is provided on the bottom surface of the obliquely upwardly extending portion of the water tank (74).

Images