Splitter plate for plastic film extruder and plastic film extruder

Abstract

The splitter plate comprises a composite plate body and a ring sleeve, the composite plate body comprises a first flow guide plate, the first flow guide plate comprises a front flow guide plate and a rear flow guide plate which are sequentially distributed in the material flowing direction, and the ring sleeve is installed on the peripheral side of the front flow guide plate and the peripheral side of the rear flow guide plate. A closed cooling cavity is formed among the front flow guide plate, the rear flow guide plate and the ring sleeve and used for cooling the first flow guide plate, the flow distribution plate is formed by combining the multiple sheet structures, the single sheet structure is easier to machine and clean compared with a thicker whole, meanwhile, due to the combination of the multiple flow guide plates, the cooling effect is better, and the cooling effect is better. The shearing heat generated when materials make contact with the splitter plate can be further reduced, the liquid cooling heat exchange structure is matched, the temperature of the splitter plate during working is kept, abnormal temperature rising is avoided, the situation that the materials are excessively plasticized, degraded or adhered due to high temperature is avoided, and the material extrusion stability and the product quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic extruders, and in particular relates to a splitter plate for a plastic film extruder and the plastic film extruder. Background Art

[0002] Plastic extruder is the core equipment for producing plastic film. The extruder heats and melts the plastic particles through its internal heating and screw rotation mechanism, and pushes the screw to extrude the molten plastic through a specific mold (i.e., extrusion head and die) to form a continuous film. The diverter plate in the extruder can evenly divert the molten plastic melt to the die head, ensuring that the plastic melt flows smoothly and evenly in the die head, which can reduce defects such as deformation and bubbles in the product production process, thereby improving product quality.

[0003] The diverter plate in the prior art is arranged between the screw head and the mold, and is provided with a plurality of flow channels distributed parallel to the axis, which can change the flow of materials from rotational motion to linear motion. Since the connecting parts between the flow channels on the diverter plate will block the flow of materials, and when the rotating flow of materials passes through the linear flow channels on the diverter plate, shear heat will also be generated, resulting in heat accumulation on the front end surface of the diverter plate. The continuous heating of the surface of the diverter plate will cause excessive plasticization or degradation of the material, causing the material to adhere to or carbonize on the surface of the diverter plate, and causing defects such as bubbles and cracks to appear in the product. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention creatively adopts a diverter plate for a plastic film extruder and a plastic film extruder to partially solve the problems raised in the above background technology.

[0005] The technical solution adopted is as follows: The embodiment of the present invention proposes a diverter plate for a plastic film extruder, comprising: The composite plate is arranged at the rear side of the extruder screw and is used to divert the material conveyed by the screw; A ring sleeve, which is sleeved on the outer side of the composite plate body to fix the composite plate body in the extruder; Wherein, the composite plate body comprises a first guide plate with a circular cross section, the first guide plate is provided with a plurality of first guide holes for materials to pass through, and the first guide holes are distributed parallel to the axis of the first guide plate; The first guide plate includes a front guide plate and a rear guide plate which are sequentially distributed along the material flow direction, the first guide holes are distributed on the front guide plate, the ring sleeve is installed on the peripheral sides of the front guide plate and the rear guide plate, so that a closed cooling cavity is formed between the front guide plate, the rear guide plate and the ring sleeve, and a liquid guide hole connected to the cooling cavity is opened on the surface of the ring sleeve, the liquid guide hole is connected to an external liquid pumping device, and can pump / deliver coolant into the cooling cavity for cooling the first guide plate.

[0006] Further, a plurality of protruding guide tubes are provided on one side of the front guide plate facing the rear guide plate, the inner side of the guide tubes has the first guide holes, and the length of the first guide holes is equal to the distance between the front end surface of the front guide plate and the rear end surface of the rear guide plate; The first flow guide hole includes a first channel and a second channel distributed in sequence along the material flow direction. The first channel is constructed as a truncated cone, and the second channel is constructed as a cylinder. The angle between the side wall of the first channel and the side wall of the second channel is set to ±30°~±60°.

[0007] Furthermore, a through groove is provided on one side of the rear guide plate facing the front guide plate corresponding to each guide tube, so that the end surface of the guide tube can pass through the rear guide plate, so that the discharge port of the second channel and the rear end surface of the rear guide plate are in the same plane; A second step groove is provided inside the through groove, and a first step groove matching with the second step groove is provided at the connection between the guide tube and the rear guide plate, so that the front guide plate and the rear guide plate are axially limited by the second step groove and the first step groove.

[0008] Further, the composite plate body further includes a third guide plate, the third guide plate and the first guide plate are sequentially distributed along the material flow direction, the third guide plate is provided with a third guide hole corresponding to the first guide hole, the third guide hole includes a third guide hole front port for material entry and a third guide hole rear port for material exit, and the area of ​​the third guide hole front port is greater than the area of ​​the third guide hole rear port; Among them, the rear port of the third guide hole is constructed in a circular shape, and the size of the rear port of the third guide hole is the same as the size of the inlet end of the second channel, the front ports of the third guide holes are compactly arranged on the end surface of the third guide plate, and the total area of ​​the plurality of front ports of the third guide holes accounts for more than 90% of the end surface area of ​​the third guide plate.

[0009] Further, the composite plate body also includes a second guide plate, and the third guide plate, the second guide plate and the first guide plate are sequentially distributed along the material flow direction, and the second guide plate is provided with a second guide hole corresponding to the first guide hole, and the second guide hole includes a second guide hole front port for material entry and a second guide hole rear port for material outflow, and the area of ​​the second guide hole front port is equal to the area of ​​the second guide hole rear port; Among them, the front port of the second guide hole coincides with the rear port of the third guide hole, the rear port of the second guide hole coincides with the inlet end of the second channel, and the rear port of the second guide hole is deflected by a set angle around the axis of the second guide plate compared to the front port of the second guide hole.

[0010] Furthermore, the deflection direction of the rear port of the second guide hole is the same as the material swirl direction, and the deflection angle of the second guide hole is smaller than the deflection angle of the material swirl.

[0011] Furthermore, the plurality of second guide holes are distributed in a plurality of groups along the radial direction, the deflection angles of the plurality of groups of second guide holes are the same or different, and the deflection angles of the plurality of second guide holes in the same group are the same; The flow speed of the material distributed in the radial direction in the axial direction is different, and the deflection angle of the second flow guide hole in the area with high material flow speed is greater than the deflection angle of the second flow guide hole in the area with low material flow speed.

[0012] Furthermore, the ring sleeve includes a collar and a retaining ring. The peripheral outer walls of the third guide plate, the second guide plate and the first guide plate are all provided with protruding positioning bumps. The inner wall of the collar is provided with positioning grooves corresponding to the positioning bumps. The third guide plate, the second guide plate, the first guide plate and the retaining ring are sequentially clamped on the inner side of the collar along the material flow direction.

[0013] An embodiment of the present invention proposes a plastic film extruder, comprising the above-mentioned diverter plate for the plastic film extruder and an extruder head for fixing the ring sleeve, wherein the outer wall of the ring sleeve is provided with more than two relatively distributed liquid guide holes, and two relatively distributed liquid guide holes form a group, and an electromagnetic valve is installed on the extruder head corresponding to each group of the liquid guide holes for controlling the on / off of the cooling chamber and the liquid guide holes.

[0014] Furthermore, the solenoid valve includes a first solenoid valve and a second solenoid valve, the first solenoid valve and the second solenoid valve are respectively connected to the input / output end of the pumping device, and the first solenoid valve and the second solenoid valve are opened / closed at the same time, and multiple groups of the solenoid valves are periodically opened and closed in sequence around the circumferential direction, so that the coolant can pass through the cooling chamber from multiple circumferential directions.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows: The present invention arranges a diverter plate with a composite structure so that the diverter plate is composed of multiple thin sheet structures. A single thin sheet structure is easier to process and clean than a thicker whole. At the same time, the combination of multiple guide plates can further reduce the shear heat generated when the material contacts the diverter plate. Combined with the liquid cooling heat exchange structure, the temperature of the diverter plate during operation is maintained to avoid abnormal temperature increase, excessive plasticization, degradation or adhesion of the material due to high temperature, thereby improving the stability of material extrusion and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A schematic diagram of the three-dimensional structure of a diverter plate for a plastic film extruder proposed in an embodiment of the present invention; Figure 2 A schematic diagram of the split structure of a flow divider for a plastic film extruder along the material flow direction proposed in an embodiment of the present invention; Figure 3 A schematic diagram of a split structure of a flow divider for a plastic film extruder proposed in an embodiment of the present invention, which is opposite to the material flow direction; Figure 4 A partially enlarged schematic diagram of a third guide plate and a second guide plate in a diverter plate for a plastic film extruder provided in an embodiment of the present invention; Figure 5 A partially enlarged schematic diagram of a split state of a first guide plate of a flow divider for a plastic film extruder provided in an embodiment of the present invention; Figure 6 The present invention is a schematic diagram of the installation structure of a diverter plate for a plastic film extruder on the extruder head according to an embodiment of the present invention.

[0017] Among them, 001, extruder head; 01, first solenoid valve; 02, second solenoid valve; 10, ring sleeve; 100, liquid guide hole; 11, sleeve ring; 110, first ring groove; 111, positioning slot; 12, retaining ring; 120, second ring groove; 20, third guide plate; 200, third guide hole; 2001, third guide hole front port; 2002, third guide hole rear port; 201, first guide surface; 30, second guide plate; 30 0. Second guide hole; 3001. Front port of second guide hole; 3002. Rear port of second guide hole; 301. Second guide surface; 40. First guide plate; 400. First guide hole; 4001. First channel; 4002. Second channel; 401. Cooling chamber; 41. Front guide plate; 411. Guide tube; 4111. First step groove; 42. Rear guide plate; 420. Through groove; 421. Second step groove; 50. Positioning protrusion.

[0018] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0020] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a diverter plate for a plastic film extruder, which aims to solve the problem of excessive plasticization or degradation of materials caused by the collision, friction and heating of the materials between the diverter plate and the molten material in the extruder when the materials come into contact with the diverter plate. The diverter plate mainly includes a composite plate body arranged on the rear side of the extruder screw for diverting the materials conveyed by the screw and a ring sleeve 10 mounted on the outside of the composite plate body, and the ring sleeve 10 is used to fix the composite plate body in the extruder.

[0022] Among them, the composite plate body at least includes a first guide plate 40 with a circular cross-section, and the first guide plate 40 is provided with a plurality of first guide holes 400 for the material to pass through, and the first guide holes 400 are distributed parallel to the axis of the first guide plate 40. In this way, the molten material transported by the screw section of the extruder can be changed from rotational motion to linear motion after passing through the first guide holes 400 of the first guide plate 40, so as to ensure that the plastic melt flows smoothly and evenly in the die head.

[0023] Furthermore, the first guide plate 40 includes a front guide plate 41 and a rear guide plate 42 which are sequentially distributed along the material flow direction, the first guide hole 400 is distributed on the front guide plate 41, and the ring sleeve 10 is installed on the peripheral side of the front guide plate 41 and the rear guide plate 42, so that a closed cooling chamber 401 is formed between the front guide plate 41, the rear guide plate 42 and the ring sleeve 10, and a liquid guide hole 100 connected to the cooling chamber 401 is opened on the surface of the ring sleeve 10, and the liquid guide hole 100 is connected to an external liquid pumping device and can pump / deliver coolant into the cooling chamber 401 for cooling the first guide plate 40.

[0024] In some embodiments, the pumping device can continuously pump coolant of a set temperature into the cooling chamber 401 through the liquid guide hole 100. It should be understood that due to the different melting points of different plastic materials, the temperatures at which they maintain a molten state are different. The purpose of the coolant is to offset the temperature increase caused by friction when the molten material passes through the first guide plate 40, aiming to keep the molten material at a set temperature in the extruder. Therefore, the continuously introduced coolant is in contact with the first guide plate 40 for heat exchange, thereby preventing the plastic from adhering to or carbonizing on the surface of the diverter plate due to excessive temperature of the first guide plate 40, thereby ensuring the state of the molten material and improving the quality of the finished product after the material is extruded.

[0025] like Figure 5 As shown, since the diverter plate is squeezed by the molten material in the extruder, it will be subjected to greater pressure. In order to make the first guide plate 40 have higher strength, a plurality of protruding guide tubes 411 are provided on the side of the front guide plate 41 facing the rear guide plate 42, and a through groove 420 is provided on the side surface of the rear guide plate 42 facing the front guide plate 41 corresponding to each guide tube 411.

[0026] Among them, a second step groove 421 is provided inside the through groove 420, and a first step groove 4111 that cooperates with the second step groove 421 is provided at the connection between the guide tube 411 and the rear guide plate 42, so that the front guide plate 41 and the rear guide plate 42 are axially limited by the second step groove 421 and the first step groove 4111.

[0027] In this way, the guide tube 411 can be clamped on the second step groove 421 in the through groove 420 through the first step groove 4111 set at the end, so as to realize axial limitation between the front guide plate 41 and the rear guide plate 42. The pressure exerted on the front guide plate 41 can be transmitted to the rear guide plate 42 through the guide tube 411, so that the first guide plate 40 has a stronger pressure resistance.

[0028] Furthermore, the inner side of the guide tube 411 has a first guide hole 400, and the end face of the guide tube 411 can pass through the rear guide plate 42, so that the discharge port of the second channel 4002 and the rear end face of the rear guide plate 42 are in the same plane, and the length of the first guide hole 400 is equal to the distance between the front end face of the front guide plate 41 and the rear end face of the rear guide plate 42, so that the material in the first guide hole 400 can only contact the wall surface of the guide tube 411, thereby reducing the friction resistance generated by the contact between the material and other objects.

[0029] In some embodiments, the first flow guide hole 400 includes a first channel 4001 and a second channel 4002 distributed in sequence along the material flow direction.

[0030] The first channel 4001 is constructed as a frustum, and the second channel 4002 is constructed as a cylinder. The angle between the side wall of the first channel 4001 and the side wall of the second channel 4002 is set to ±30°~±60°. The first channel 4001 can play a transition role, so that the material is gradually narrowed and guided to the second channel 4002, and to a certain extent can slow down the swirl speed of the flow material in the rotation direction, and reduce the shear heat of the flow material. When the angle between the side walls of the channels is 30 degrees, the transition effect is smoother, but the path is relatively long, resulting in a large thickness of the diverter plate. When the angle between the side walls of the channels is 60 degrees, the transition speed is faster, which will relatively increase the frictional heat between the flow material and the hole wall, but the path is relatively short and the thickness of the diverter plate is thinner. Therefore, in a general embodiment, the angle between the side wall of the first channel 4001 and the side wall of the second channel 4002 is set to ±45°, taking into account both the transition effect and the size advantage.

[0031] The holes on a general manifold are arranged in concentric circles or hexagons. Regardless of the arrangement, the total area of ​​the holes is usually 30% to 70% of the total area of ​​the manifold due to the connection between the holes. When the molten material passes through the manifold, a considerable portion of the material will come into contact with the non-hole portion of the plate, and then return and pass through the holes together with the forward-flowing material. In this way, the friction between the material and the non-hole portion of the plate will generate more heat, and the accumulation of this heat will lead to local temperature rise, causing the material to be over-plasticized or degraded. Therefore, reducing the area of ​​the non-hole can also reduce the temperature rise of the manifold to a certain extent.

[0032] like Figure 2 , Figure 3 and Figure 4 As shown ( Figure 2 and Figure 3 The direction of the arrow is the flow direction of the material). In order to reduce the non-channel area when the material contacts the diverter plate, the composite plate body also includes a third guide plate 20. The third guide plate 20 and the first guide plate 40 are distributed in sequence along the material flow direction.

[0033] The third guide plate 20 is provided with a third guide hole 200 corresponding to the first guide hole 400. The third guide hole 200 includes a third guide hole front port 2001 for material entry and a third guide hole rear port 2002 for material exit. The area of ​​the third guide hole front port 2001 is larger than the area of ​​the third guide hole rear port 2002. In this way, the non-channel area is reduced by increasing the port area on the inlet side, thereby reducing the temperature generated by friction when the material contacts the diverter plate.

[0034] In some embodiments, the third guide hole rear port 2002 is circular in structure, and the size of the third guide hole rear port 2002 is the same as the inlet end size of the second channel 4002 , so that the material entering the third guide hole 200 can be smoothly introduced into the second channel 4002 .

[0035] The third guide hole front port 2001 is compactly arranged on the end surface of the third guide plate 20. Figure 4 As shown in the example, the third guide hole front port 2001 is constructed as a circle, and the edges are tangent or intersecting and compactly distributed, and the total area of ​​multiple third guide hole front ports 2001 accounts for more than 90% of the end surface area of ​​the third guide plate 20. In this way, when the fluid reaches the end surface of the third guide plate 20, most of the fluid will directly enter the third guide hole 200, and a small part of the fluid will contact the end surface of the third guide plate 20, so the heat generated by the friction between the material and the diverter plate will be reduced.

[0036] In some embodiments, the shape of the third guide hole front port 2001 is not limited to a circle, but can also be a regular hexagon or other special-shaped structures, so that the total area of ​​multiple third guide hole front ports 2001 accounts for 95% or even higher of the end surface area of ​​the third guide plate 20, further reducing the heat generated by the friction between the material and the diverter plate.

[0037] Furthermore, the third guide hole 200 is provided with a first guide surface 201 connected to the third guide hole front port 2001 and the third guide hole rear port 2002. The first guide surface 201 can be set to a concave arc surface, a convex arc surface or a straight inclined surface, aiming to slow down the flow speed of the material and the shear heat generated when the material flow passes through the diverter plate.

[0038] In the extruder, shear heat is generated when the material passes through the flow channel of the manifold. This is mainly because the material is sheared between the screw and the manifold and between the materials in the flow channel. When the screw rotates, it pushes the material forward in the flow channel of the manifold. At the same time, friction occurs between the materials and between the materials and the manifold. This friction causes mechanical energy to be converted into heat energy, thereby generating shear heat.

[0039] Excessive shear heat may cause excessive plasticization or degradation of the material, resulting in defects such as bubbles and cracks. These defects will reduce the strength and durability of plastic products. At the same time, shear heat will also affect the fluidity and uniformity of the material, thereby affecting the surface quality and internal structure of the plastic product.

[0040] like Figure 2 , Figure 3 and Figure 4As shown, in order to further reduce the shear heat generated when the material passes through the flow channel of the diverter plate, the composite plate body also includes a second guide plate 30, and the third guide plate 20, the second guide plate 30 and the first guide plate 40 are distributed in sequence along the material flow direction. The second guide plate 30 is provided with a second guide hole 300 corresponding to the first guide hole 400, and the second guide hole 300 includes a second guide hole front port 3001 for material entry and a second guide hole rear port 3002 for material outflow, and the area of ​​the second guide hole front port 3001 is equal to the area of ​​the second guide hole rear port 3002.

[0041] The second guide hole front port 3001 coincides with the third guide hole rear port 2002 , the second guide hole rear port 3002 coincides with the inlet end of the second channel 4002 , and the second guide hole rear port 3002 is deflected by a set angle around the axis of the second guide plate 30 compared to the second guide hole front port 3001 .

[0042] In some embodiments, the deflection direction of the rear port 3002 of the second guide hole is the same as the material swirl direction, and the deflection angle of the second guide hole 300 is smaller than the deflection angle when the material swirls. Therefore, after the swirling material enters the second guide hole 300, it contacts the second guide surface 301 in the second guide hole 300. Since the deflection angle of the second guide surface 301 is smaller than the deflection angle when the material swirls, under the guidance of the second guide surface 301, the material can contact the wall in a relatively slow manner, thereby reducing the friction resistance between the material and the wall, reducing the heat generated by friction, and gradually guiding the material in the swirling state to a direction parallel to the axis.

[0043] Compared with the existing diverter plate, the material in the swirling state directly enters the flow channel parallel to the axis. Since the angle between the fluid flow direction and the flow channel direction is large, the impact force is large, and the heat generated by the friction between the material and the straight flow channel inner wall is also large. After the swirling material is guided by the second guide plate 30, the angle between the fluid flow direction and the flow channel direction is reduced, and the heat generated by the friction between the material and the straight flow channel inner wall is reduced, thereby achieving a better diversion effect, and avoiding excessive plasticization or degradation of the plastic under high-temperature shear heat.

[0044] Furthermore, the plurality of second guide holes 300 are distributed in a plurality of groups along the radial direction, the deflection angles of the plurality of groups of second guide holes 300 are the same or different, and the deflection angles of the plurality of second guide holes 300 in the same group are the same.

[0045] In some embodiments, because the material, in addition to moving forward as a whole under the push of the screw, also has a speed difference in the radial direction (perpendicular to the axis of the screw), the material distributed in the radial direction has different axial flow speeds, and the deflection angle of the second guide hole 300 in the area with large material flow rate is greater than the deflection angle of the second guide hole 300 in the area with small material flow rate. Taking the center as fast and the edge as slow as an example, at this time, the deflection angle of the second guide hole 300 in the center area is greater than the deflection angle of the second guide hole 300 in the edge area, so that when the material reaches the first guide plate 40, it approaches the same speed, making the material distribution more uniform.

[0046] like Figure 1 and Figure 2 As shown, the ring sleeve 10 includes a collar 11 and a retaining ring 12. The third guide plate 20, the second guide plate 30 and the first guide plate 40 are provided with protruding positioning bumps 50 on the peripheral outer walls. A positioning groove 111 is provided on the inner wall of the collar 11 corresponding to the positioning bumps 50. The third guide plate 20, the second guide plate 30, the first guide plate 40 and the retaining ring 12 are sequentially clamped on the inner side of the collar 11 along the material flow direction.

[0047] Among them, the front end face of the ring 11 has a first annular groove 110 for material to flow in, and the rear end face of the retaining ring 12 has a second annular groove 120 for material to flow out. After the third guide plate 20, the second guide plate 30, and the first guide plate 40 are clamped into the inside of the ring 11 according to the set sequence, the retaining ring 12 is installed to axially limit the third guide plate 20, the second guide plate 30, and the first guide plate 40.

[0048] like Figure 6 As shown, an embodiment of the present invention provides a plastic film extruder, including the above-mentioned diverter plate for the plastic film extruder and an extruder head 001 for fixing the ring sleeve 10, and the outer wall of the ring sleeve 10 is provided with more than two relatively distributed liquid guide holes 100, with two relatively distributed liquid guide holes 100 as a group, and an electromagnetic valve is installed on the extruder head 001 corresponding to each group of liquid guide holes 100, which is used to control the on / off of the cooling chamber 401 and the liquid guide holes 100.

[0049] In some embodiments, the solenoid valve includes a first solenoid valve 01 and a second solenoid valve 02, and the first solenoid valve 01 and the second solenoid valve 02 are respectively connected to the input / output end of the pumping device, that is, the input / output end of the pumping device is connected to the two solenoid valves through two pipe groups, respectively, and the first solenoid valve 01 and the second solenoid valve 02 are opened / closed at the same time. When the solenoid valve is opened, the pumping device can continuously pump coolant into the cooling chamber 401 to cool the diverter plate, maintain the temperature of the material, and avoid excessive plasticization or degradation of the material due to high temperature.

[0050] In order to avoid poor heat exchange caused by the coolant entering from one side, in some embodiments, multiple groups of liquid guide holes 100 can be set on the ring sleeve 10 at the same time, and corresponding solenoid valves are equipped with multiple groups, and the solenoid valves are periodically opened and closed in sequence around the circumferential direction, so that the coolant can pass through the cooling cavity 401 from multiple directions in the circumferential direction, so as to ensure that the coolant can flow into the cooling cavity 401 from multiple directions, thereby achieving a better cooling effect.

[0051] In combination with the above embodiments, a composite structure diverter plate is provided so that the diverter plate is composed of multiple thin sheet structures, and a single thin sheet structure is easier to process and clean than a thicker whole. At the same time, the combination of multiple guide plates can further reduce the shear heat generated when the material contacts the diverter plate, and cooperate with the liquid cooling heat exchange structure to maintain the temperature of the diverter plate during operation, avoid abnormal temperature increase, avoid excessive plasticization, degradation or adhesion of the material due to high temperature, and improve the stability of material extrusion and product quality.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] Although embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the embodiments is defined by the appended claims and their equivalents.

[0054] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A splitter plate for a plastic film extruder, characterized in that: include: The composite plate is arranged at the rear side of the extruder screw and is used to divert the material conveyed by the screw; A ring sleeve (10) is sleeved on the outer side of the composite plate body to fix the composite plate body in the extruder; The composite plate body comprises a first guide plate (40) with a circular cross section, the first guide plate (40) is provided with a plurality of first guide holes (400) for materials to pass through, and the first guide holes (400) are distributed parallel to the axis of the first guide plate (40); The first guide plate (40) comprises a front guide plate (41) and a rear guide plate (42) which are sequentially distributed along the material flow direction; the first guide holes (400) are distributed on the front guide plate (41); the annular sleeve (10) is installed on the peripheral sides of the front guide plate (41) and the rear guide plate (42) so that a closed cooling cavity (401) is formed between the front guide plate (41), the rear guide plate (42) and the annular sleeve (10); a liquid guide hole (100) which is in communication with the cooling cavity (401) is provided on the surface of the annular sleeve (10); the liquid guide hole (100) is in communication with an external liquid pumping device and can pump / deliver cooling liquid into the cooling cavity (401) for cooling the first guide plate (40).

2. The splitter plate for a plastic film extruder according to claim 1, characterized in that: A plurality of protruding guide tubes (411) are provided on one side of the front guide plate (41) facing the rear guide plate (42); the inner side of the guide tube (411) has the first guide hole (400); the length of the first guide hole (400) is equal to the distance between the front end surface of the front guide plate (41) and the rear end surface of the rear guide plate (42); The first flow guide hole (400) comprises a first channel (4001) and a second channel (4002) distributed in sequence along the material flow direction, the first channel (4001) is constructed as a truncated cone, the second channel (4002) is constructed as a cylinder, and the angle between the side wall of the first channel (4001) and the side wall of the second channel (4002) is set to ±30°~±60°.

3. The splitter plate for a plastic film extruder according to claim 2, characterized in that: A through groove (420) is provided on one side of the rear guide plate (42) facing the front guide plate (41) at a position corresponding to each guide tube (411), so that the end surface of the guide tube (411) can pass through the rear guide plate (42), so that the discharge port of the second hole (4002) and the rear end surface of the rear guide plate (42) are in the same plane; A second step groove (421) is provided inside the through groove (420), and a first step groove (4111) cooperating with the second step groove (421) is provided at the connection between the guide tube (411) and the rear guide plate (42), so that the front guide plate (41) and the rear guide plate (42) are axially limited by the second step groove (421) and the first step groove (4111).

4. The splitter plate for a plastic film extruder according to claim 2, characterized in that: The composite plate body further comprises a third guide plate (20), wherein the third guide plate (20) and the first guide plate (40) are sequentially distributed along the material flow direction, the third guide plate (20) is provided with a third guide hole (200) corresponding to the first guide hole (400), the third guide hole (200) comprises a third guide hole front port (2001) through which the material enters, and a third guide hole rear port (2002) through which the material flows out, and the area of ​​the third guide hole front port (2001) is greater than the area of ​​the third guide hole rear port (2002); The third guide hole rear port (2002) is constructed in a circular shape, and the size of the third guide hole rear port (2002) is the same as the size of the inlet end of the second channel (4002), the third guide hole front ports (2001) are compactly arranged on the end surface of the third guide plate (20), and the total area of ​​the plurality of third guide hole front ports (2001) accounts for more than 90% of the end surface area of ​​the third guide plate (20).

5. The manifold for plastic film extruder according to claim 4, characterized in that: The composite plate body further comprises a second guide plate (30), wherein the third guide plate (20), the second guide plate (30) and the first guide plate (40) are sequentially arranged along the material flow direction, the second guide plate (30) is provided with a second guide hole (300) corresponding to the first guide hole (400), the second guide hole (300) comprises a second guide hole front port (3001) for material to enter and a second guide hole rear port (3002) for material to flow out, and the area of ​​the second guide hole front port (3001) is equal to the area of ​​the second guide hole rear port (3002); The front port (3001) of the second guide hole coincides with the rear port (2002) of the third guide hole, the rear port (3002) of the second guide hole coincides with the inlet end of the second channel (4002), and the rear port (3002) of the second guide hole is deflected by a set angle around the axis of the second guide plate (30) compared to the front port (3001) of the second guide hole.

6. The manifold for a plastic film extruder according to claim 5, characterized in that: The deflection direction of the rear port (3002) of the second guide hole is the same as the material swirl direction, and the deflection angle of the second guide hole (300) is smaller than the deflection angle of the material swirl.

7. The manifold for a plastic film extruder according to claim 6, characterized in that: The plurality of second flow guide holes (300) are distributed in a plurality of groups along the radial direction, the deflection angles of the plurality of groups of second flow guide holes (300) are the same or different, and the deflection angles of the plurality of second flow guide holes (300) in the same group are the same; The flow speed of the material distributed in the radial direction in the axial direction is different, and the deflection angle of the second flow guide hole (300) in the area with a large material flow speed is greater than the deflection angle of the second flow guide hole (300) in the area with a small material flow speed.

8. The manifold for a plastic film extruder according to claim 5, characterized in that: The ring sleeve (10) comprises a collar (11) and a retaining ring (12); the third guide plate (20), the second guide plate (30) and the first guide plate (40) are all provided with protruding positioning bumps (50) on their peripheral outer walls; a positioning slot (111) is provided on the inner wall of the collar (11) corresponding to the positioning bumps (50); the third guide plate (20), the second guide plate (30), the first guide plate (40) and the retaining ring (12) are sequentially mounted on the inner side of the collar (11) along the material flow direction.

9. A plastic film extruder, characterized in that: It comprises the manifold for a plastic film extruder as claimed in claim 8 and an extruder head (001) for fixing the ring sleeve (10), wherein the outer wall of the ring sleeve (10) is provided with more than two relatively distributed liquid guide holes (100), and two relatively distributed liquid guide holes (100) form a group. A solenoid valve is installed on the extruder head (001) corresponding to each group of the liquid guide holes (100) for controlling the on / off of the cooling chamber (401) and the liquid guide holes (100).

10. The plastic film extruder according to claim 9, characterized in that: The solenoid valve comprises a first solenoid valve (01) and a second solenoid valve (02), the first solenoid valve (01) and the second solenoid valve (02) being connected to the input / output end of the pump device respectively, and the first solenoid valve (01) and the second solenoid valve (02) are opened / closed at the same time, and a plurality of groups of the solenoid valves are opened and closed periodically in a circumferential direction, so that the coolant can pass through the cooling cavity (401) from multiple circumferential directions.

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