A twin-kneader continuous mixer

Abstract

The application discloses a double-reflow continuous mixer, which comprises a roller, the roller is horizontally arranged, the roller comprises an inner cylinder, the inner cylinder comprises an inner cavity, at least one end of a discharge port of the inner cavity is provided with a first pushing device, the first pushing device is used for pushing material from one end of the discharge port of the inner cavity to a feeding port during mixing, and the discharge port is arranged on a central axis of the roller, so that the material overflows from the discharge port when the material in the inner cavity reaches a predetermined amount. The mixer of the application realizes efficient and rapid continuous feeding, continuous mixing and continuous discharging of the material by arranging the first pushing device for pushing the material back from the discharge port.

Description

TECHNICAL FIELD

[0001] The present application relates to a horizontal continuous mixer, in particular to a horizontal continuous mixer for pharmaceutical industry. BACKGROUND

[0002] Mixers are used to mix two or more materials, generally including a tank and a stirring device, the stirring device of a horizontal ribbon mixer is two ribbon with different helical directions, when stirring, the materials in the tank are subjected to compound motion of two helical directions, the materials near the inner wall rotate clockwise and counterclockwise, the materials near the shaft center rotate around the shaft center, and are pushed axially from inside to both sides, the outer helical ribbon drives the materials near the cylinder wall to rotate around the shaft center, and is pushed axially from both sides to the inside, thus causing convection circulation and shear penetration mixing of the materials in the cylinder, and completing the mixing of the materials. For example, a multifunctional drum mixer is disclosed in Chinese patent CN114849550A, which has the disadvantage that the mixing movement of the existing horizontal mixer is relatively single, the mixing speed is slow, and the existing horizontal mixer generally cannot be used for continuous mixing, because the existing mixer generally adopts batch mixing, and cannot mix, feed and discharge materials at the same time, and cannot ensure that the materials in the mixer are fully mixed before discharging. The present application aims to provide a continuous mixer with better mixing effect and faster mixing speed. SUMMARY

[0003] The present application aims to provide a continuous mixer with better mixing effect, by setting the discharge port of the mixer in the middle of the drum (with a certain height), and using the first displacement device to push the materials near the discharge port away in the opposite direction during continuous mixing.

[0004] To this end, a double-reflux continuous mixer according to the present application includes a drum, which is horizontally arranged, and includes an inner cylinder, and the inner cylinder includes an inner cavity, at least one end of the discharge port of the inner cavity is provided with a first displacement device, the first displacement device is used to push the materials from one end of the discharge port of the inner cavity to the inlet port during mixing, and the discharge port is arranged on the central axis of the drum, in such a way that when the materials in the inner cavity reach a predetermined amount, the materials overflow from the discharge port.

[0005] Further, a second displacement device is also included, which includes a helical second paddle, the second paddle is arranged on the shaft or near the shaft, and is arranged at one end of the inlet port of the inner cylinder, and the other end is arranged at a predetermined distance from one end of the discharge port of the inner cylinder, and is used to push the materials from the inlet port to the discharge port, in such a way that the materials are pushed to a predetermined distance from the discharge port and are pushed away by the first displacement device in the opposite direction.

[0006] Further, the first pushing device comprises a helical first paddle, which is arranged on the inner cylinder wall or the side close to the inner cylinder wall and extends from one end of the inner cavity to the other end, and is used to push the material towards the feeding port, so that the material forms a first circulation in the inner cavity.

[0007] Further, the outer side of the first paddle is provided with a baffle, or the included angle between the tangent of the cross section of the first paddle and the tangent of the cross section of the inner cylinder wall is an acute angle.

[0008] Further, the outer cylinder is arranged outside the inner cylinder, a cavity is arranged between the outer cylinder and the inner cylinder, a through hole is arranged between the cavity and the inner cavity of the inner cylinder, and a third pushing device is arranged in the cavity, which is used to push the material to move towards the feeding port and cooperate with the first pushing device or the second pushing device to axially move the material between the inner cavity and the cavity to form a second circulation.

[0009] Further, the third pushing device comprises a third paddle, the helical direction of the third paddle is the same as that of the second paddle, and the third paddle extends from one end of the cavity to the other end.

[0010] Further, the drum further comprises tapered cylinder bodies on the two sides of the inner cylinder and the outer cylinder, one end of the tapered cylinder body is connected with one end of the inner cylinder and the outer cylinder, and the drum further comprises a discharging device, the discharging device comprises a discharging port and a conveying assembly, the discharging port is arranged on the center of the tapered cylinder body, the drum rotates along the central axis, so that the position of the discharging port does not change during rotation, the conveying assembly comprises a guide belt, the guide belt is connected to the inner wall of the tapered cylinder body, the cross section of the guide belt is L-shaped, one end of the guide belt extends towards the discharging port, and the other end of the guide belt is arranged at the end of the tapered cylinder body away from the discharging port, the drum drives the conveying assembly to rotate in a predetermined direction to convey the material in the inner cavity of the mixing machine to the discharging port.

[0011] Further, the drum further comprises tapered cylinder bodies on the two sides of the inner cylinder and the outer cylinder, one end of the tapered cylinder body is connected with one end of the inner cylinder and the outer cylinder, and the drum further comprises a discharging device, the discharging device comprises a discharging port and a conveying assembly, the discharging port is arranged on the center of the tapered cylinder body, the drum rotates along the central axis, so that the position of the discharging port does not change during rotation, the conveying assembly comprises a guide belt, the guide belt is connected to the inner wall of the tapered cylinder body, the cross section of the guide belt is L-shaped, one end of the guide belt extends towards the discharging port, and the other end of the guide belt is arranged at the end of the tapered cylinder body away from the discharging port, the drum drives the conveying assembly to rotate in a predetermined direction to convey the material in the inner cavity of the mixing machine to the discharging port.

[0012] Furthermore, it includes a feeding device with the feeding port located at one end of the conical cylinder of the roller. It also includes a ring connected to the conical cylinder and a baffle ring located on the inner side of the ring and cooperating with the ring. There is a rotation gap between the baffle ring and the ring. Several grooves are provided on the outer wall of the baffle ring or the inner wall of the ring. An elastic sealing ring is installed in at least one groove. The elastic sealing ring cooperates with the ring and the baffle ring to form a seal to block the material.

[0013] Furthermore, the system includes a transmission device comprising a chain, a sprocket cooperating with the chain, a support ring, and a support roller cooperating with the support ring. The chain is driven by a drive device. The ring body is smaller than the diameter of the drum body. The inner wall of the sprocket is annular. Corresponding keyways and slots are provided on the outer wall of the ring body and the inner wall of the sprocket. The keyways and slots are respectively provided with a key and a rod connecting the ring body and the sprocket, so that the sprocket is connected to the outer wall of the ring body. The support rings are respectively connected to the conical cylinders on both sides of the drum. The support rings include positioning protrusions. The support rollers are fixed on the frame, and the roller surface includes positioning grooves that cooperate with the positioning protrusions, so that the drum rotates along the axis under the drive of the chain.

[0014] The beneficial effects of this invention are as follows:

[0015] (1) The mixer of the present invention is a horizontal mixer mainly used for continuous material mixing. Mixers usually employ batch mixing, that is, after the materials are added to the mixer, they are thoroughly mixed and then discharged in batches. Continuous mixing, on the other hand, allows for continuous feeding and discharging. The problem is how to ensure that the materials are mixed evenly before being discharged through the discharge port during continuous mixing. The present invention avoids the materials entering the mixer from being discharged from the discharge port too early by setting up a first pushing device that pushes the materials away from the discharge port in the opposite direction, so that the materials entering the mixer have sufficient time to be mixed evenly.

[0016] (2) On the other hand, the double-recirculation drum structure of the present invention can significantly improve the mixing effect and mixing speed. Specifically, the mixing process of the present invention includes multiple mixing actions: refer to Figure 2 or Figure 9 as well as Figure 11 As shown, firstly, during the rotation of the drum (with... Figure 2 For example, looking from left to right (with the drum rotating clockwise), the material undergoes intense radial shear mixing as it tumbles along the inner cavity under gravity; secondly, referring to... Figure 2 or Figure 9mixing trajectory 3, the material in the upper part of the inner cavity (or close to the shaft center) is pushed by the second paddle to move from the feeding port to the discharging port, the overall movement is horizontal, but the specific mixing movement is actually spiral, and the radial shear mixing is combined to form strong and efficient mixing; after the material moves to the end of the second paddle, the material enters the action range of the first paddle under the action of gravity, referring to Figure 2 or Figure 9 mixing trajectory 2, the first paddle pushes the material to move to the feeding port, and the process is similar to the mixing process of the second paddle, the difference is that the overall movement direction is opposite, due to the pushing action of the first paddle, the lower material moves to the feeding port, and the material enters the upper part through the channel, and then moves to the discharging port under the action of the second paddle, under the action of the above-mentioned repeated spiral advancing mixing and radial strong shear mixing, the material can be mixed more quickly and uniformly.

[0017] (3) The inner cylinder and the outer cylinder are provided, and the through hole is arranged between the inner cylinder and the outer cylinder, the material can pass through the through hole from the inner cavity of the inner cylinder to the cavity of the outer cylinder, and at least a part of the paddles with opposite spiral directions are arranged in the inner cavity and the cavity, so that the material moves in opposite directions in the axial direction during mixing, and forms a circulation through the through hole, so that the material is mixed more fully; the first paddle and the second paddle with opposite spiral directions are arranged in the inner cylinder, the first paddle is arranged close to the shaft center of the inner cylinder, and the second paddle is arranged close to the separation layer of the inner cylinder, the first paddle and the second paddle push the material to move in opposite directions in the axial direction, forming a circulating motion in the inner cylinder, and combining with the circulation of the outer cylinder to form a double circulation motion, further improving the mixing effect of the mixing machine. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic view of the specific embodiment of the mixing machine of the present application;

[0019] Figure 2 It is a sectional view of the mixing machine;

[0020] Figure 3 It is a schematic view of the feeding port;

[0021] Figure 4 It is a schematic view of the feeding port groove and the sealing ring;

[0022] Figure 5 It is a schematic view of the discharging port;

[0023] Figure 6 It is a schematic view of the filtering device;

[0024] Figure 7 It is a schematic view of the transmission device;

[0025] Figure 8is a schematic view of the transmission device from above;

[0026] Figure 9 is a schematic view of the conical cylinder, the retaining ring and the ring body;

[0027] Figure 10 is a schematic view of the inner cylinder and the partition plate

[0028] Figure 11 is a schematic view of the mixed trajectory of the inner cylinder.

[0029] BRIEF DESCRIPTION OF DRAWINGS 1, frame; 2, roller; 201, cylinder body; 202, conical cylinder; 203, inner cylinder; 204, inner cavity; 205, first paddle; 206, second paddle; 207, outer cylinder; 208, containing cavity; 209, through hole; 210, third paddle; 211, partition plate; 3, feeding device; 301, feeding port; 302, ring body; 303, material blocking ring; 304, groove; 305, sealing ring; 306, feeding pipe; 4, discharging device; 401, discharging port; 402, guide belt; 5, transmission device; 501, sprocket; 502, key body; 503, rod body; 504, chain; 505, motor; 506, supporting wheel; 507, positioning groove; 508, retaining ring; 509, positioning convex strip; 6, pulse filter unit; 601, filter device; 602, pipeline; 603, control valve; 604, backflush pipe. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purposes, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0031] REFERENCE Figures 1 to 8As shown, the double reflux continuous mixer of the present application is a horizontal mixer, the main components include feeding device 3, discharging device 4, roller 2 and transmission device 5, the feeding device 3 is arranged at one end of the roller 2, the discharging device 4 is arranged at the other end of the roller 2, the roller 2 is horizontally arranged on the frame 1, the roller 2 includes a cylindrical barrel body 201 and a tapered barrel body 202, the driving device drives the roller 2 to rotate through the transmission device 5, the barrel body 201 includes an inner barrel 203, the inner barrel 203 includes an inner cavity 204, the inner cavity 204 is provided with a first pushing device at one end close to the discharge port 401, the first pushing device is a first paddle 205, the first paddle 205 and the following second paddle 206 and third paddle 210 are all spiral metal material spiral belts, the first paddle 205 is fixed on the inner barrel wall or the side close to the inner barrel wall through welding or other fixing methods, when the roller 2 rotates, the material in the inner cavity 204 is subjected to gravity action to tumble to produce shear mixing, and other mixing movements are performed under the action of other mixing structures such as the stirring shaft in the prior art, when the material moves to one side of the inner cavity 204 close to the discharge port 401, the roller 2 drives the first paddle 205 to rotate, the first paddle 205 pushes the material away from the discharge port 401, prolonging the mixing time of the material, the discharging device 4 includes the discharge port 401, the discharge port 401 is arranged on the central axis of the roller 2, when the material in the mixer reaches a predetermined amount, the material overflows from the discharge port 401. Preferably, the inner cavity 204 further includes a second pushing device, the second pushing device includes a spiral second paddle 206, the second paddle 206 is arranged on the shaft center or the side close to the shaft center, the second paddle 206 is arranged at one end of the feeding port 301 of the inner barrel 203, and the other end is away from one end of the discharge port 401 of the inner barrel 203 by a predetermined length for pushing the material from the feeding port 301 to the discharge port 401, and in this embodiment, the length is one third of the length of the barrel body 201 close to the discharge port 401 of the inner cavity 204. The spiral directions of the first paddle 205 and the second paddle 206 are opposite, when the roller 2 rotates, the second paddle 206 pushes the material to spiral move towards the discharge port 401, when the material reaches two thirds of the length of the barrel body 201, the material falls into the action range of the first paddle 205 under the action of gravity, and is reversely pushed by the first paddle 205 towards the feeding port 301, and preferably the first paddle 205 extends from one end of the inner cavity 204 to the other end. The first paddle 205 and the second paddle 206 make the material form a first circulation in the inner cavity 204, in the first circulation, the material is subjected to longitudinal shear mixing when the roller 2 rolls, and transverse and longitudinal mixing actions of the paddle spiral movement. In this embodiment, the first paddle 205 can improve the residence time of the material in the roller 2, so that the material has enough mixing time in the inner cavity 204 of the mixer to achieve uniform mixing, and the first circulation formed by the first paddle 205 and the second paddle 206 can realize rapid mixing of the material, ensuring that the material is fully mixed in a short enough time.

[0032] In the above embodiments, in order to further improve the mixing rate and mixing effect of the drum 2, with reference to Figure 2 As shown in the figure, the drum 2 further comprises an outer cylinder 207, which is arranged outside the inner cylinder 203, one end of the conical cylinder body 202 is connected to one end of the inner cylinder 203 and the outer cylinder 207 through a bolt nut, a cavity 208 is arranged between the outer cylinder 207 and the inner cylinder 203, a through hole 209 is arranged between the cavity 208 and the inner cavity 204 of the inner cylinder 203, and the through hole 209 is preferably arranged at both ends of the inner cylinder 203. A third pushing device is arranged in the cavity 208, which comprises a helical third paddle 210, and the helical direction of the third paddle 210 is the same as that of the second paddle 206, and the third paddle 210 extends from one end of the cavity 208 to the other end of the cavity 208. The third paddle 210 cooperates with the first paddle 205 and / or the second paddle 206 to move the material axially between the inner cavity 204 and the cavity 208 to form a second circulation.

[0033] In the above embodiments, with reference to Figure 10 As shown in the figure, a gap can be arranged between the first paddle 205 and the second paddle 206 (the end of the second paddle 206 away from the central axis and the end of the first paddle 205 close to the central axis), which facilitates personnel access during maintenance. The first paddle 205 and the second paddle 206 can also not have a gap, and the second paddle 206 has a larger size and better stirring effect. A partition plate 211 can also be arranged, which can be made of a metal partition plate and can be connected to the outside of the first paddle 205 (away from the inner cylinder wall), which enables the material to move independently in the spiral channel formed by the first paddle 205 and the partition plate 211. Due to the difficulty in manufacturing a spiral-shaped partition plate, the scheme shown in the figure of the present embodiment can also be used, in which the included angle between the first paddle 205 and the inner cylinder 203 wall is an acute angle, that is, the cross section of the inner cylinder 203 takes the intersection point of the first paddle 205 and the inner cylinder 203 wall as the tangent point, and the tangent line of the first paddle 205 and the tangent line of the inner cylinder 203 wall form an acute angle. During the tumbling process of the material in the drum 2, the material can spiral forward along the gap formed by the first paddle 205 and the inner cylinder 203 wall, reducing the movement of the material between the first paddle 205 and the second paddle 206 during mixing. Figure 2

[0034] In the above embodiments, with reference to Figures 2 to 4 ​As shown, the feeding device 3 comprises a feeding port 301 arranged at one end of the conical cylinder 202 of the roller 2, a ring body 302 connected to the conical cylinder 202, a material blocking ring 303 arranged at the inner side of the ring body 302 and matched with the ring body 302, the material blocking ring 303 is provided with a plurality of mounting holes, a feeding pipe 306 is mounted in the larger mounting hole, a rotating gap is arranged between the material blocking ring 303 and the ring body 302, a plurality of grooves 304 are arranged on the outer wall of the material blocking ring 303 or the inner wall of the ring body 302, at least one elastic sealing ring 305 is mounted in the groove 304, and the elastic sealing ring 305 is matched with the ring body 302 and the material blocking ring 303 to form a blocking for blocking the material. Referring to Figure 7 、 Figure 8 and Figure 9 As shown, the ring body 302 is matched with the sprocket 501 of the transmission device 5, the diameter of the ring body 302 is smaller than the diameter of the cylinder body 201 of the roller 2, the inner wall of the sprocket 501 is annular, the outer wall of the ring body 302 and the inner wall of the sprocket 501 are provided with corresponding key grooves and insertion grooves, the key grooves and the insertion grooves are respectively provided with a key body 502 and a rod body 503 connected with the ring body 302 and the sprocket 501, so that the sprocket 501 is connected to the outer wall of the ring body 302, the sprocket 501 is matched with the chain 504, the transmission device 5 further comprises a driving device such as a motor 505, the motor 505 is connected with a speed reducer, the speed reducer is connected with the chain 504, the motor 505 drives the chain 504 to drive the sprocket 501, the sprocket 501 drives the ring body 302, and the ring body 302 drives the roller 2 to rotate, and reinforcing ribs can be arranged between the ring body 302 and the cylinder to improve the structural strength. The transmission device 5 further comprises a supporting ring 508 and a supporting wheel 506 matched with the supporting ring 508, the supporting ring 508 is connected to the conical cylinder 202 on both sides of the roller 2, specifically, the supporting ring 508 comprises a positioning convex strip 509, the supporting wheel 506 is fixed on the rack 1, and the wheel surface of the supporting wheel 506 comprises a positioning groove 507 matched with the positioning convex strip 509, the supporting wheel 506 comprises a load bearing wheel for bearing and an auxiliary wheel for guiding, and the cooperation of the supporting wheel 506 and the supporting ring 508 enables the roller 2 to rotate along the axis under the driving of the chain 504.

[0035] In the above embodiment, referring to Figure 5As shown, the discharging device 4 further comprises a conveying assembly, the drum 2 rotates around the central axis, so that the position of the discharge port 401 remains unchanged during rotation, the conveying assembly comprises a guide belt 402 connected to the inner wall of the conical cylinder 202, which is L-shaped in cross section, one end extends to the discharge port 401, and the other end is located at the end of the conical cylinder 202 away from the discharge port 401, and the drum 2 drives the conveying assembly to rotate in a predetermined direction to convey the material in the mixing chamber 204 to the discharge port 401. It should be noted that one end of one or more guide belts 402 can be connected or in contact or close to one end of the corresponding first paddle 205, so that when the drum 2 is reversed, the first paddle 205 pushes the material to the guide belt 402, and the guide belt 402 conveys the material to the discharge port.

[0036] In the above embodiment, with reference to Figure 6 As shown, two pulse filter units 6 are arranged side by side and work alternately, wherein when the control valve 603 of one pulse filter unit 6 is closed to perform reverse impact on the corresponding pipeline 602, the control valve 603 of the other pulse filter unit 6 is opened. Specifically, the pulse filter unit 6 comprises a filter device 601, a pipeline 602, a control valve 603 and a backflushing pipe 604, the filter device 601 comprises a filter cartridge arranged in the inner cavity 204 near the material inlet 301 and connected with the pipeline 602, the pipeline 602 is installed on the corresponding installation hole reserved in the material blocking ring 303, the control valve 603 is connected with the pipeline 602, the pipeline 602 is connected with the fan, and the backflushing pipe 604 is connected in front of the pipeline 602 (the backflushing pipe is not controlled by the control valve 603 described above), the backflushing pipe 604 is connected with a gas storage tank or a compressed gas pipe and is suitable for using gas to perform reverse impact on the filter device 601 at a predetermined time interval, and before the reverse impact of the filter device 601, the control valve 603 of the unit is closed to close the pipeline 602.

[0037] The continuous mixer in the above embodiment is mainly used for continuous mixing, but it is not only used for continuous mixing mode, but also has batch mixing mode. The steps and principles of the mixer in the embodiment for continuous mixing are described as follows, which comprises the following steps:

[0038] S1: A predetermined amount of material is added to the drum 2 through the feeding device 3, and the mixer drum 2 is started to rotate in a predetermined direction to uniformly stir the material;

[0039] S2: The material is continuously added to the drum 2 at a predetermined speed, and the mixer continuously mixes;

[0040] S3: When the material in the mixer reaches a predetermined height, the material is fully discharged from the discharge port 401 of the discharging device 4;

[0041] S4: continuous mixing is finished, the drum 2 is reversed, the guide belt 402 of the discharging device 4 transports the material to the discharging port 401 until the material is completely discharged.

[0042] The length of the barrel 201 of the drum 2 can be several meters. In this embodiment, the length of the barrel 201 is 5 meters. The pre-joined amount of material is generally not more than 60% of the mixing volume of the drum 2. In this embodiment, the corresponding particle material weight is 6 tons. In the continuous working mode, the corresponding amount of two or more materials is first added to the drum 2, and mixed for a predetermined time. Then, the material is added to the feeding pipe of the drum 2 at a speed of 2 kg / s. The rotating speed of the drum 2 is 10 rpm. The rotating speed of the drum can be adjusted. Generally, the drum rotates at a speed of several revolutions per minute or one or two revolutions per minute to realize stirring. Since the continuously added material is very small relative to the amount of fully mixed material in the barrel, and the drum structure is efficient and the device pushes the material away from the discharging port in the opposite direction, the continuously added material has little effect on the overall mixing ratio, thereby realizing the required continuous mixing operation. In this embodiment, the discharging port 401 uses overflow discharging in the continuous mixing mode. When the material in the drum 2 is more and more, the material naturally overflows from the discharging port 401. When batch discharging or continuous mixing is finished and the material in the drum 2 needs to be completely discharged, the drum 2 is reversed, and the guide belt 402 plays a role in transporting the material to completely discharge the material.

[0043] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments, which does not depart from the technical solution of the present application, are still within the scope of the present application.

Claims

1. A dual-recirculation continuous mixer, comprising a drum, wherein the drum is horizontally arranged, characterized in that: The drum includes an inner cylinder, which includes an inner cavity. At least one end of the inner cavity outlet is provided with a first pushing device. The first pushing device is used to push the material from the outlet end of the inner cavity to the inlet during mixing. The outlet is located on the central axis of the drum, so that when the material in the inner cavity reaches a predetermined amount, the material overflows from the outlet. It also includes a second pushing device, which includes a spiral second blade. The second blade is located near the axis and is located at one end of the feed inlet of the inner cylinder. The other end is a predetermined length away from the discharge outlet of the inner cylinder to push the material from the feed inlet to the discharge outlet. In this way, the material is pushed to a predetermined distance from the discharge outlet and then pushed away in the opposite direction by the first pushing device. The first pushing device includes a spiral first blade, which is located near the inner cylinder wall and extends from one end of the inner cavity to the other end. The first pushing device is used to push the material towards the feed inlet, so that the material forms a first circulation in the inner cavity. A baffle is provided on the outer side of the first blade; or the angle formed by the tangent of the cross-sectional surface of the first blade and the tangent of the cross-sectional surface of the inner cylinder wall is an acute angle. It also includes an outer cylinder, which is disposed outside the inner cylinder. A cavity is provided between the outer cylinder and the inner cylinder. A through hole is provided between the cavity and the inner cavity of the inner cylinder. A third pushing device is provided in the cavity. The third pushing device is used to push the material towards one end of the feed port and cooperate with the first pushing device or the second pushing device to drive the material to move axially between the inner cavity and the cavity to form a second cycle. The third pushing device includes a third blade, the helical direction of which is the same as that of the second blade, and the third blade extends from one end of the cavity to the other end.

2. The dual-recirculation continuous mixer according to claim 1, characterized in that: The drum also includes conical bodies on both sides of the inner and outer cylinders, with one end of the conical body connected to one end of the inner and outer cylinders. It also includes a discharge device, which includes a discharge port and a conveying assembly. The discharge port is located at the center of the conical body. The drum rotates along the central axis so that the position of the discharge port remains unchanged during rotation. The conveying assembly includes a guide belt connected to the inner wall of the conical body. The guide belt has an L-shaped cross-section, with one end extending towards the discharge port and the other end located at the end of the conical body away from the discharge port. The drum drives the conveying assembly to rotate in a predetermined direction to convey the material in the mixer cavity to the discharge port.

3. A dual-recirculation continuous mixer according to claim 1, characterized in that: it includes two pulse-type filter units arranged in parallel, wherein the pulse-type filter units operate alternately, wherein, When the control valve of one pulse-type filter unit closes the pipeline for backflushing, the control valve of another pulse-type filter unit opens. The pulse-type filter unit includes a filter device, a pipeline, a control valve, and a backflushing pipe. The filter device includes a filter cartridge, which is located in a cavity near the feed inlet and connected to the pipeline. The control valve is connected to the pipeline, which is connected to a blower. The backflushing pipe is connected to the side of the pipeline and is used to backflush the filter device with gas at predetermined time intervals. Before the filter device backflushes, the control valve closes the pipeline.

4. A double-reflux continuous mixer according to claim 3, characterized in that: it includes a feeding device, the feeding port of which is located at one end of the conical cylinder of the drum, and further includes an annular body connected to the conical cylinder and a baffle ring located on the inner side of the annular body and cooperating with the annular body, wherein a rotation gap is provided between the baffle ring and the annular body, and a plurality of grooves are provided on the outer wall of the baffle ring or the inner wall of the annular body, wherein an elastic sealing ring is installed in at least one groove, and the elastic sealing ring cooperates with the annular body and the baffle ring to form a seal for blocking the material.

5. A double-recirculation continuous mixer according to claim 4, characterized in that: it includes a transmission device, comprising a chain, a sprocket cooperating with the chain, a support ring, and a support roller cooperating with the support ring; the chain is driven by a driving device; the ring body is smaller than the diameter of the drum body; the inner wall of the sprocket is annular; the outer wall of the ring body and the inner wall of the sprocket are provided with corresponding keyways and slots; the keyways and slots are respectively provided with a key and a rod connecting the ring body and the sprocket, so that the sprocket is connected to the outer wall of the ring body; the support rings are respectively connected to the conical cylinders on both sides of the drum; the support rings include positioning protrusions; the support rollers are fixed on the frame, and the wheel surface of the support rollers includes positioning grooves cooperating with the positioning protrusions, so that the drum rotates along the axis under the drive of the chain.

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