CN217752658U - Hollow plate extrusion molding equipment and hollow plate production system - Google Patents

Abstract

The application relates to the technical field of hollow plate production equipment, in particular to hollow plate extrusion molding equipment and a hollow plate production system. The hollow plate extrusion molding apparatus includes: the device comprises an extruder, a buffer device, a hollow plate die and a shaping device which are connected in sequence. Wherein, the buffer device is provided with an inner cavity; the buffer device is provided with a first end and a second end which are opposite, and the buffer device is provided with a material inlet positioned at the first end and a material outlet positioned at the second end; the inner cavity is provided with a stirring element. The application provides a well hollow plate extrusion moulding equipment is favorable to avoiding the extruder to extrude the in-process because the bulk density to the powder that the extruder added and aggregate is inconsistent and lead to the inhomogeneous phenomenon of material distribution among the hot melt, and then is favorable to avoiding the hot melt directly to get into the hollow plate mould and the well hollow plate product powder content that causes is inconsistent and the uneven phenomenon of panel thickness.

Description

Hollow plate extrusion molding equipment and hollow plate production system

Technical Field

The application relates to the technical field of hollow plate production equipment, in particular to hollow plate extrusion molding equipment and a hollow plate production system.

Background

The hollow plate is prepared by feeding an extruder to enable the extruder to extrude hot melt, shaping the hot melt after the hot melt enters a hollow plate die, and then sequentially carrying out the steps of traction, tempering, cooling, cutting and the like.

However, in the production of the hollow sheet, the raw materials to be fed to the extruder include powder raw materials and pellet raw materials having different bulk densities. The inconsistent bulk density of the powder and the granule added to the extruder can result in uneven feeding (including uneven powder proportion, uneven feeding speed and the like) to the extruder, so that the distribution of the powder and the granule in the material entering the hot melt of the hollow plate die is uneven, the quality of the prepared hollow plate is poor (the phenomena of inconsistent powder content and uneven plate thickness of the hollow plate product) and the requirement of a client cannot be met.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a well hollow plate extrusion moulding equipment and well hollow plate production system, it aims at improving the inhomogeneous technical problem of material distribution in the current hot melt that gets into the hollow plate mould.

In a first aspect, the present application provides a hollow sheet extrusion molding apparatus comprising: the device comprises an extruder, a buffer device, a hollow plate die and a shaping device which are connected in sequence.

Wherein, the buffer device is provided with an inner cavity; the buffer device is provided with a first end and a second end which are opposite, and the buffer device is provided with a material inlet positioned at the first end and a material outlet positioned at the second end; the inner cavity is provided with a stirring element.

This application is through connecting buffer between extruder and cavity board mould, and set up the stirring component in buffer's inner chamber, can be so that the distribution that gets into the powder in the hot melt of buffer inner chamber and aggregate is more even after extruding from the extruder, be favorable to avoiding the extruder at continuous feed and extrusion in-process because the bulk density of the powder that adds to the extruder and aggregate is inconsistent and the inhomogeneous phenomenon of the material distribution in the hot melt that leads to, and then be favorable to avoiding the hot melt directly to get into cavity board mould and the cavity board product powder content that causes is inconsistent and the uneven phenomenon of panel thickness. In addition, buffer's setting also can temporarily store the hot melt that the extruder was extruded, is favorable to avoiding the extrusion rate of extruder too fast, and the hot melt directly gets into the hollow plate mould fast and the uneven phenomenon of thickness of the hollow plate product that causes.

In some embodiments of the first aspect of the present application, the stirring member includes a shaft extending in a direction from the first end toward the second end, and a helical auger blade fixed to an outer periphery of the shaft; in the process that the material moves in the inner cavity, the material can push the blades of the spiral auger to drive the rotating shaft to rotate around the axial direction of the rotating shaft.

Above-mentioned mode of setting up, when the axial of spiral auger blade revolute the axis of rotation rotated, spiral auger blade can have the shearing action to the material in the inner chamber, and then realizes the stirring to the material, is favorable to improving the distribution uniformity of material.

In some embodiments of the first aspect of the present application, a blocking member is further disposed in the inner cavity, and the blocking member is disposed on a side of the rotating shaft away from the first end; the blocking piece is used for abutting against the end part of the rotating shaft far away from the first end, and a gap for materials to pass through is formed between the blocking piece and the peripheral wall body of the inner cavity, which is around the first end and points to the second end.

The setting of blockking, can be so that the material removes the in-process to the second end by first end in the inner chamber, when material and spiral auger blade contact and have thrust to spiral auger blade, the tip of keeping away from first end of pivot is because being blockked the piece and support and make the pivot can not take spiral auger blade to the second end removal, and then make the material can promote spiral auger blade and drive the axial rotation that the pivot circled the axle, effectively stir the material in the inner chamber to realizing spiral auger blade, be favorable to improving the distribution homogeneity of material. And a gap for materials to pass through is formed between the blocking piece and the peripheral wall body of the inner cavity, which points to the second end around the first end, so that the materials can pass through the gap between the blocking piece and the peripheral wall body of the inner cavity after being stirred and dispersed, and then enter the hollow plate die from the material outlet.

In some embodiments of the first aspect of the present application, the inner cavity has a plurality of conveying channels extending along a direction from the first end to the second end, one end of each of the plurality of conveying channels is communicated with the material inlet, and the other end of each of the plurality of conveying channels is communicated with the material outlet.

Each conveying channel is internally provided with a stirring element and a blocking piece, and each blocking piece is arranged on one side of the rotating shaft far away from the first end; a gap for the material to pass through is arranged between the blocking piece and the peripheral wall body of the conveying channel, which is directed to the second end around the first end.

Above-mentioned mode of setting up for the material that gets into the inner chamber through the material import can get into a plurality of transfer passage respectively, realizes effectively stirring the material simultaneously in a plurality of transfer passage, is favorable to further improving the dispersion of buffer to the material.

In some embodiments of the first aspect of the present application, the inner chamber further comprises an input chamber disposed on a side of the delivery channel distal from the second end and an output chamber disposed on a side of the delivery channel distal from the first end; one end of each conveying channel is communicated with the input cavity, and the other end of each conveying channel is communicated with the output cavity.

Wherein, along the direction of first end to second end, the internal diameter of input chamber increases gradually, and the internal diameter of output chamber reduces gradually.

The inner diameter of the input cavity is gradually increased along the direction from the first end to the second end, so that the materials entering the input cavity through the material inlet can be guided, and can enter a plurality of conveying channels; along the direction of first end to second end, the internal diameter of output chamber reduces gradually, can carry out the water conservancy diversion to the material of exporting from a plurality of transfer passage to make the material export output from the material more smoothly.

In some embodiments of the first aspect of the present application, the buffer device is further provided with a heating element for heating the inner cavity.

The arrangement of the heating element can improve the thermal motion of molecules in the material, and also can keep the temperature of the hot melt (namely the material) to avoid the solidification of the hot melt, thereby being beneficial to further improving the dispersion effect of the buffer device on the material.

In some embodiments of the first aspect of the present application, the cushioning device is further provided with an insulating layer.

The setting of heat preservation can effectively keep warm to buffer's inner chamber, is favorable to further improving the dispersion of buffer to the material.

In some embodiments of the first aspect of the present application, the hollow sheet extrusion molding apparatus further comprises a screen changer disposed between and connecting the extruder and the buffer device; the hollow plate extrusion molding equipment further comprises a body metering pump which is arranged between the buffer device and the hollow plate die and is connected with the buffer device and the hollow plate die.

In some embodiments of the first aspect of the present application, the extruder is a twin-screw extruder, each screw in the twin-screw extruder having a length to diameter ratio of (52-60): 1.

the arrangement mode can be favorable for improving the dispersion uniformity of the material extruded by the extruder.

In a second aspect, the present application provides a void sheet production system comprising: the hollow plate extrusion molding equipment, the first traction equipment, the tempering equipment, the air cooling equipment, the second traction equipment and the cutting equipment are sequentially connected.

The application provides a well hollow plate production system is favorable to avoiding the extruder to extrude the in-process because the bulk density to the powder that the extruder added and aggregate is inconsistent and lead to the inhomogeneous phenomenon of material distribution among the hot melt, and then be favorable to avoiding the hot melt directly to get into the hollow plate mould and the well hollow plate product powder content that causes is inconsistent and the inhomogeneous phenomenon of panel thickness, also be favorable to avoiding the extrusion speed of extruder too fast, the hot melt directly gets into the hollow plate mould fast and the well hollow plate product thickness that causes is inhomogeneous phenomenon.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 shows a schematic structural diagram of a hollow plate extrusion molding device provided in an embodiment of the present application.

Fig. 2 shows a schematic structural diagram of a buffer device provided in an embodiment of the present application.

Fig. 3 showsbase:Sub>A cross-sectional view along the directionbase:Sub>A-base:Sub>A in fig. 2.

Fig. 4 shows a cross-sectional view along the direction B-B in fig. 2.

Icon: 100-an extruder; 200-a buffer device; 201-a first end; 202-a second end; 210-lumen; 211-material inlet; 212-material outlet; 213-a transport channel; 214-an input cavity; 215-an output cavity; 220-a stirring element; 221-a rotating shaft; 222-a spiral auger blade; 230-a barrier; 240-a heating element; 250-an insulating layer; 300-hollow plate mold; 400-a shaping device; 500-a screen changer; 600-melt metering pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when products of the application are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of description and simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the application.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

The application provides a well hollow plate production system, well hollow plate production system includes: the device comprises hollow plate extrusion molding equipment, first traction equipment, tempering equipment, air cooling equipment, second traction equipment and cutting equipment which are connected in sequence.

The hollow plate extrusion molding equipment is used for melting and extruding raw materials for preparing the hollow plate to form hot melt, pushing the hot melt into a hollow plate mold for molding, and then shaping to obtain the primary hollow plate. And the primary hollow plate is subjected to traction of a first traction device, tempering and cooling of an air cooling device, traction of a second traction device and cutting of a cutting device to form a finished hollow plate.

It should be noted that the first drawing device, the tempering device, the air cooling device, the second drawing device and the cutting device are common devices in the prior art, and the structure is not described in the present application.

Fig. 1 is a schematic structural diagram of a void sheet extrusion molding apparatus according to an embodiment of the present disclosure, and referring to fig. 1, the void sheet extrusion molding apparatus includes an extruder 100, a buffer device 200, a void sheet mold 300, and a shaping device 400, which are connected in sequence.

The buffering device 200 is disposed between the extruder 100 and the hollow plate mold 300, and can temporarily store the hot melt extruded by the extruder 100, thereby being beneficial to preventing the phenomenon that the hot melt directly and rapidly enters the hollow plate mold 300 to cause uneven thickness of the hollow plate product due to too fast extrusion speed of the extruder 100.

Fig. 2 showsbase:Sub>A schematic structural diagram ofbase:Sub>A buffering device 200 according to an embodiment of the present application, and fig. 3 showsbase:Sub>A cross-sectional view taken alongbase:Sub>A-base:Sub>A direction in fig. 2, please refer to fig. 2 and 3, in which the buffering device 200 hasbase:Sub>A first end 201 andbase:Sub>A second end 202 opposite to each other, the first end 201 isbase:Sub>A left end in fig. 2 and 3, and the second end 202 isbase:Sub>A right end in fig. 2 and 3. The buffering device 200 has an inner cavity 210, and the buffering device 200 has a material inlet 211 at the first end 201 and a material outlet 212 at the second end 202.

The material inlet 211 and the material outlet 212 are both communicated with the inner cavity 210, the material inlet 211 is communicated with the output end of the extruder 100, and the material inlet 211 is communicated with the input end of the hollow plate mold 300.

In the present application, a stirring element 220 is disposed in the inner cavity 210. Due to the arrangement of the stirring element 220, the distribution of the materials in the hot melt entering the inner cavity 210 of the buffer device 200 after being extruded from the extruder 100 is more uniform, which is beneficial to avoiding the phenomenon of non-uniform distribution of the materials in the hot melt caused by inconsistent bulk densities of powder and granules added to the extruder in the continuous feeding and extruding processes of the extruder 100.

In use, the direction in which the first end 201 points towards the second point 202 is parallel to the horizontal, and material moves in the cavity 210 in the direction in which the first end 201 points towards the second point 202.

The stirring element 220 can be as shown in fig. 3, that is, the stirring element 220 comprises a rotating shaft 221 extending along the direction from the first end 201 to the second end 202 and a helical auger blade 222 fixed on the outer periphery of the rotating shaft 221; the stirring element 220 may also be a stirring paddle, a stirring rod of the stirring paddle is disposed along a vertical direction, one end of the stirring paddle is located outside the inner cavity 210 and connected to the motor, and the other end of the stirring paddle is located in the inner cavity 210 and connected to the stirring blade.

Compared with the scheme that the stirring element 220 is set as the stirring paddle, in the setting mode of the stirring element 220 shown in fig. 3 (that is, the stirring element 220 includes the rotating shaft 221 extending along the direction from the first end 201 to the second end 202 and the spiral auger blade 222 fixed to the periphery of the rotating shaft 221), when the spiral auger blade 222 rotates around the axial direction of the rotating shaft 221, the spiral auger blade 222 can shear the material moving in the inner cavity 210 along the direction perpendicular to the moving direction of the material, so as to stir the material, and improve the distribution uniformity of the material.

In the present application, the rotation of the rotating shaft 221 and the helical auger blade 222 is realized by pushing the helical auger blade 222 in the process that the material moves from the first end 201 to the second end 202; specifically, the material continuously enters the buffering device 200 from the extruder 100, the material moves from the first end 201 to the second end 202 in the inner cavity 210, and the material pushes the helical auger blade 222 to drive the rotating shaft 221 to rotate around the axial direction of the rotating shaft 221 in the moving process, so as to stir the material.

Fig. 4 shows a cross-sectional view along the direction B-B in fig. 2, referring to fig. 3 and fig. 4, when the material contacts the auger blade 222 and pushes the auger blade 222 in the process of moving from the first end 201 to the second end 202 in the inner cavity 210, the rotating shaft 221 and the auger blade 222 tend to move toward the second end 202; in order to effectively prevent the rotating shaft 221 from driving the spiral auger blade 222 to move towards the second end 202, and further to enable the spiral auger blade 222 to drive the rotating shaft 221 to axially rotate around the rotating shaft 221 when the material has a thrust effect on the spiral auger blade 222, so that the material in the inner cavity 210 can be effectively stirred by the spiral auger blade 222; in the present application, a blocking member 230 is disposed in the inner cavity 210, and the blocking member 230 is disposed on a side of the rotating shaft 221 away from the first end 201; and a gap for materials to pass through is formed between the blocking member 230 and the peripheral wall body of the inner cavity 210 which points to the second end 202 around the first end 201, and the blocking member 230 is used for abutting against the end part of the rotating shaft 221 far away from the first end 201, so as to limit the rotating shaft 221 and the stirring element 220 consisting of the spiral auger blade 222 to move towards the second end 202.

The barrier 230 and the peripheral wall of the inner cavity 210, which is directed to the second end 202 around the first end 201, have a gap for passing the material, so that the material can pass through the gap between the barrier 230 and the peripheral wall of the inner cavity 210 after being stirred and dispersed, and then enter the hollow plate mold 300 after being output from the material outlet.

As an example, the blocking member 230 may be a block or a strip, as long as the blocking member 230 can abut against the end of the rotating shaft 221 away from the first end 201, and a gap through which the material can pass is formed between the blocking member 230 and the peripheral wall of the inner cavity 210 that is directed to the second end 202 around the first end 201.

In order to further improve the dispersion effect of the buffering device 200 on the material, in this application, the inner cavity 210 has a plurality of conveying channels 213 extending along the direction from the first end 201 to the second end 202, one end of each of the plurality of conveying channels 213 is communicated with the material inlet 211, and the other end of each of the plurality of conveying channels 213 is communicated with the material outlet 212.

Each conveying channel 213 is provided with a stirring element 220 (i.e. a rotating shaft 221 extending along the direction from the first end 201 to the second end 202 and a helical auger blade 222 fixed on the outer periphery of the rotating shaft 221) and a blocking member 230, and each blocking member 230 is arranged on the side of the rotating shaft 221 far away from the first end 201; at this time, each blocking member 230 has a gap for passing the material between the peripheral wall of the conveying channel 213 that is directed to the second end 202 around the first end 201.

Above-mentioned mode of setting up for the material that gets into inner chamber 210 through material import 211 can get into a plurality of transfer passage 213 respectively, realizes effectively stirring the material simultaneously in a plurality of transfer passage 213, is favorable to further improving the dispersion of buffer 200 to the material.

In this embodiment, as shown in fig. 4, 4 delivery channels 213 are provided in the inner chamber 210. It should be noted that the number of the conveyance paths 213 is not limited in the present application.

The inner chamber 210 further comprises an input chamber 214 disposed on a side of the delivery channel 213 remote from the second end 202 and an output chamber 215 disposed on a side of the delivery channel 213 remote from the first end; one end of each transfer channel 213 communicates with the input chamber 214, and the other end of each transfer channel 213 communicates with the output chamber 215.

Further, the inner diameter of the input chamber 214 gradually increases and the inner diameter of the output chamber 215 gradually decreases in the direction from the first end 201 to the second end 202.

The inner diameter of the input cavity 214 gradually increases along the direction from the first end 201 to the second end 202, so that the material entering the input cavity 214 through the material inlet 211 can be guided, and the material can enter the plurality of conveying channels 213; the inner diameter of the output cavity 215 gradually decreases along the direction from the first end 201 to the second end 202, so that the material output from the plurality of conveying channels 213 can be guided to be output from the material outlet 212 more smoothly.

It should be noted that, in other possible embodiments, the inner cavity 210 may not be divided into a plurality of conveying channels 213, that is, only one inner cavity 210 extending along the direction from the first end 201 to the second end 202 is disposed in the buffer device 200, at this time, a stirring element 220 composed of a rotating shaft 221 and a spiral auger blade 222 may also be disposed in the inner cavity 210, the rotating shaft 221 passes through the material inlet 211 and the material outlet 212, gaps are formed between the rotating shaft 221 and the material inlet 211 and the material outlet 212, one end of the rotating shaft 221 is connected to a motor outside the inner cavity 210, and the motor rotates to drive the rotating shaft 221 and the spiral auger blade 222 to rotate around the axial direction of the rotating shaft 221, so as to achieve stirring and dispersing of the material by the spiral auger blade 222.

Referring to fig. 4, a heating element 240 is further disposed on the buffer device 200, and the heating element 240 is used for heating the inner cavity 210. The heating element 240 can improve the thermal movement of molecules in the material, and can also maintain the temperature of the hot melt (i.e., the material) to prevent the hot melt from solidifying, which is beneficial to further improving the dispersion effect of the buffer device 200 on the material.

In this embodiment, the heating element 240 is disposed within the wall of the buffer device 200. It should be noted that in other possible embodiments, the heating element 240 may be disposed on the outer surface of the buffer device 200, as long as the inner cavity 210 can be heated.

The heating element 240 may be, for example, a heating wire or an electromagnetic heating coil, and the like, and the present application is not limited thereto.

Further, in order to effectively keep warm to the inner cavity 210 of the buffering device 200 and be favorable to further improving the dispersion effect of the buffering device 200 on materials, in this embodiment, the buffering device 200 is also externally provided with a heat preservation layer 250.

Illustratively, the insulation layer 250 includes insulation cotton covering the outer surface of the cushioning device 200 and tinfoil covering the outer surface of the insulation cotton.

In this example, the extruder 100 is a twin-screw extruder, each screw in the twin-screw extruder having a length to diameter ratio of (52-60): 1, may be beneficial to improve the uniformity of dispersion of the material extruded by the extruder 100.

In this embodiment, the apparatus for extrusion molding of hollow board further comprises a screen changer 500 and a melt metering pump 600, wherein the screen changer 500 is disposed between the extruder 100 and the buffer device 200 and connected to the extruder 100 and the buffer device 200, and the melt metering pump 600 is disposed between the buffer device 200 and the hollow board mold 300 and connected to the buffer device 200 and the hollow board mold 300.

The hollow plate extrusion molding equipment provided by the embodiment at least has the following advantages:

this application is through connecting buffer 200 between extruder 100 and hollow plate mould 300, and set up stirring element 220 in buffer 200's inner chamber 210, can make the material distribution that gets into in buffer 200 inner chamber 210's the hot melt after extruding from extruder 100 more even, be favorable to avoiding extruder 100 in continuous feed and extrusion process because the bulk density of the powder that adds to the extruder and aggregate is inconsistent and the inhomogeneous phenomenon of material distribution in the hot melt that leads to, and then be favorable to avoiding the hot melt directly to get into hollow plate mould and the hollow plate product powder content that causes is inconsistent with the inhomogeneous phenomenon of panel thickness. In addition, the arrangement of the buffering device 200 can also temporarily store the hot melt extruded by the extruder 100, which is beneficial to avoiding the phenomenon that the thickness of the hollow plate product is uneven because the hot melt directly and quickly enters the hollow plate mold 300 because the extrusion speed of the extruder 100 is too high.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An apparatus for hollow sheet extrusion molding, comprising: the extruder, the buffer device, the hollow plate die and the shaping device are connected in sequence;

wherein the cushioning device has an inner cavity; the buffer device has a first end and a second end opposite to each other, and the buffer device has a material inlet at the first end and a material outlet at the second end; and a stirring element is arranged in the inner cavity.

2. The apparatus of claim 1, wherein the stirring member comprises a shaft extending in a direction from the first end to the second end, and a screw auger blade fixed to an outer periphery of the shaft; the material is in the in-process that the inner chamber removed, the material can promote spiral auger blade drives the pivot is around the axial of pivot rotates.

3. The apparatus of claim 2, wherein a blocking member is further disposed in the inner cavity, and the blocking member is disposed on a side of the rotating shaft away from the first end; the blocking piece is used for abutting against the end part of the rotating shaft far away from the first end, and a gap through which the material can pass is formed between the blocking piece and the peripheral wall body of the inner cavity, which is around the first end and points to the second end.

4. The apparatus according to claim 3, wherein the inner chamber has a plurality of conveying passages extending in a direction from the first end to the second end, one end of each of the plurality of conveying passages is communicated with the material inlet, and the other end of each of the plurality of conveying passages is communicated with the material outlet;

the stirring element and the blocking piece are arranged in each conveying channel, and each blocking piece is arranged on one side of the rotating shaft, which is far away from the first end; and a gap for the material to pass through is formed between the blocking piece and the peripheral wall body of the conveying channel, which is around the first end and points to the second end.

5. The apparatus of claim 4, wherein the internal cavity further comprises an input cavity disposed on a side of the delivery channel distal from the second end and an output cavity disposed on a side of the delivery channel distal from the first end; one end of each conveying channel is communicated with the input cavity, and the other end of each conveying channel is communicated with the output cavity;

wherein, along the direction from the first end to the second end, the inner diameter of the input cavity is gradually increased, and the inner diameter of the output cavity is gradually decreased.

6. The apparatus of claim 1, wherein the buffer device further comprises a heating element for heating the inner cavity.

7. The apparatus of claim 6, wherein the buffer device is further provided with an insulating layer.

8. The apparatus of claim 1, further comprising a screen changer disposed between and connecting the extruder and the buffer;

the hollow plate extrusion molding equipment further comprises a melt metering pump arranged between the buffer device and the hollow plate die and connected with the buffer device and the hollow plate die.

9. The apparatus of claim 1, wherein the extruder is a twin screw extruder, each screw of the twin screw extruder having a length to diameter ratio of (52-60): 1.

10. a hollow panel production system, comprising: the hollow plate extrusion molding device, the first drawing device, the tempering device, the air cooling device, the second drawing device and the cutting device which are connected in sequence according to any one of claims 1 to 9.

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