Mixing device for plastic extruder

Abstract

The invention relates to the field of extruders, in particular to a mixing device for a plastic extruder, the extruder comprises a machine barrel, and the mixing device comprises a first conveying mechanism, a second conveying mechanism and a third conveying mechanism, the second conveying mechanism comprises a second barrel; the transition barrel is communicated with the discharging end of the first barrel and the feeding end of the second barrel, and in the vertical direction, the height of the discharging end of the first barrel is larger than that of the feeding end of the second barrel; the hoppers are arranged at the feeding end of the first barrel, the hoppers are communicated with the first barrel through inlets, and opening degree valves used for controlling the opening degrees of the inlets are arranged on the inlets; the side surface of the first barrel body and the side surface of the second barrel body are fixedly connected with the side surface of the machine barrel, and the discharging end of the second barrel body is provided with a material opening communicated with the interior of the machine barrel. By means of the device, raw materials can be fused faster, and therefore the situation that particles of the plastic raw materials cannot be fully fused when passing through a heating system can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of extruders, in particular to a mixing device for a plastic extruder. Background Art

[0002] Plastic extruder is an important equipment in the plastic processing industry. It includes a barrel, an extrusion head, and a transmission system and a heating system located in the barrel. When producing plastic products through an extruder, a variety of plastic raw materials (plastic raw materials are in granular form) are usually required. Therefore, the transmission system will fully mix the various plastic raw materials before transmitting them to the heating system. Since the heating zone length of the heating system is limited, after the raw materials are fully mixed and enter the heating zone, a small part of the particles may not be fully melted during the rapid transmission process of the transmission system, which will cause quality problems of plastic products. Therefore, a new device is needed to solve the above problems. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a mixing device for a plastic extruder to solve the technical problem in the prior art that after the plastic raw materials enter the plastic extruder, a small portion of particles may not be fully melted during the rapid transmission process of the transmission system.

[0004] Based on the above purpose, the present invention provides a mixing device for a plastic extruder, the extruder includes a barrel, and the mixing device includes: The first conveying mechanism comprises a first cylinder, a first push shaft rotatably arranged in the first cylinder, a first spiral blade arranged on a side surface of the first push shaft, and a first motor for driving the first push shaft to rotate; The second conveying mechanism includes a second cylinder, a second push shaft rotatably arranged in the second cylinder, a second spiral blade arranged on the side surface of the second push shaft, and a second motor for driving the second push shaft to rotate; A transition cylinder connecting the discharge end of the first cylinder and the feed end of the second cylinder, wherein the height of the discharge end of the first cylinder is greater than the height of the feed end of the second cylinder in the vertical direction, so that the material entering the transition cylinder moves toward the second cylinder under the action of gravity; A plurality of hoppers are arranged on the feeding end of the first cylinder, the hoppers are connected to the first cylinder through an inlet, and an opening valve for controlling the opening of the inlet is arranged on the inlet; The side surface of the first cylinder and the side surface of the second cylinder are both fixedly connected to the side surface of the barrel, and the discharge end of the second cylinder is provided with a material port communicating with the inside of the barrel.

[0005] Furthermore, the side surface of the first push shaft, the side surface of the second push shaft, the surface of the first spiral blade and the surface of the second spiral blade are all provided with stirring rods with different lengths.

[0006] Furthermore, the upper surface of the transition cylinder bulges upward to form a convex cavity, and the top of the convex cavity is provided with a through hole communicating with the outside, and the mixing device also includes: Side panels disposed opposite to each other to form an adjustment area; A movable plate and a guard plate arranged opposite to one side of the movable plate, wherein a temporary storage area is formed between the opposite guard plates; A material receiving plate is provided with a first shaft hole and a first rotating shaft fixed in the temporary storage area, the first rotating shaft is rotatably connected to the first shaft hole; the material receiving plate has at least a first state and a second state; when the bottom end of the material receiving plate contacts the side of the movable plate, the temporary storage area above the material receiving plate forms a storage space for temporarily storing the sample to be tested, and at this time, the material receiving plate is in the first state; when there is a gap between the bottom end of the material receiving plate and the side of the movable plate for the sample to be tested to pass through, the material receiving plate is in the second state; A first holding portion for keeping the receiving plate in a first state; A first telescopic cylinder is disposed in the adjustment area, wherein an output shaft of the first telescopic cylinder is fixedly connected to the top of the movable plate; A mounting plate disposed in the adjustment area and a plurality of CCD cameras disposed on the mounting plate, a light source being disposed on one side of the mounting plate, and a detection channel for passing the temporary storage area is formed between the CCD camera and the light source; A second holding portion is used to keep the material receiving plate in the second state after the temporary storage area moves to above the detection channel.

[0007] Furthermore, the first holding portion includes: A hinge rod with one end hinged to the inner side surface of the material receiving plate and a first slider hinged to the other end of the hinge rod, the first slider being slidably connected to a first slide groove provided on the side surface of the movable plate, the first slide groove being located above the temporary storage area; A first guide wheel is arranged on one side of the movable plate, wherein the first guide wheel and the guard plate are located on different sides of the movable plate, and the first guide wheel is located below the first sliding block, and a first rope hole is arranged at the bottom of the first sliding groove; A pull rope with one end fixed to the bottom of the first sliding block, the pull rope passes through the first rope hole and passes around the first guide wheel; A third motor is fixed in the adjustment area and a reel is arranged on the output shaft of the third motor, and the other end of the pull rope is fixed in the rope groove of the reel.

[0008] Furthermore, the mixing device also includes: A fixed plate fixed to the perforated side wall, the side of the movable plate facing away from the hinge rod is in contact with the side of the fixed plate facing the movable plate, a bottom groove located below the perforation is provided at the bottom of the fixed plate, a part of the bottom groove is located in the convex cavity, and another part of the bottom groove extends to the interior of the transition tube; A second sliding block is arranged on the side of the movable plate facing away from the hinge rod, and the second sliding block is slidably connected to a second sliding groove arranged on the side of the movable plate; A second guide wheel, wherein a wheel groove is provided at the top of the bottom groove, a second rope hole is provided at the top of the wheel groove and passes through the top of the fixing plate, and the second guide wheel is arranged in the wheel groove; the pull rope passes through the second rope hole and bypasses the second guide wheel; A rope groove communicating with the first rope hole is provided at the bottom of the side surface of the movable plate facing the fixed plate, and the first guide wheel is arranged in the rope groove; A groove is provided on one side of the fixing plate, and the light source is arranged in the groove.

[0009] Furthermore, the first holding portion further includes: A third guide wheel is arranged in the adjustment area, and the third guide wheel is located above the fixed plate; A moving block slidably connected to the through slot provided on the side plate, wherein the moving block is located between the third motor and the third guide wheel; A fourth guide wheel is arranged on the moving block, and the pull rope passes around the third guide wheel and the fourth guide wheel in sequence; A spring with one end fixed to one end of the through slot, and the other end of the spring fixed to the moving block; A first pressure sensor is arranged at the other end of the through groove.

[0010] Furthermore, the second holding portion includes: A second rotating shaft and a limiting plate with a second shaft hole on the top, the second rotating shaft is fixed in the adjustment area, and the second rotating shaft is fixed in the second shaft hole, when the limiting plate is in a vertical state, a material channel for the temporary storage area to pass through is formed between the plane where the limiting plate is located and the plane where the fixing plate is located; A lever, wherein the side plate is provided with a through hole, the lever is slidably connected to the through hole, and after the lever is extended into the adjustment area, it is located in the incoming material channel; A sliding assembly for driving the lever to slide along the through hole; A rotating assembly for driving the second rotating shaft to rotate; After the lever is completely separated from the incoming material channel, the limit plate rotates to an inclined state, and after a part of the lever enters the adjustment area, the side of the limit plate maintains contact with the lever, maintaining the inclined state of the limit plate, so that the distance between the front end of the material receiving plate and the fixed plate is greater than the distance between the bottom end of the limit plate and the fixed plate.

[0011] Furthermore, the rotating assembly includes: A limit block provided at the edge of the through groove and a second pressure sensor provided on the limit block, wherein the second pressure sensor faces the moving block; A straight rod located outside the side plate, one end of which is fixed to the moving block; A spur rack is arranged on the straight rod and a first gear is installed on the second rotating shaft. The spur rack matches the first gear. When the spur rack passes under the second rotating shaft, the first gear meshes with the spur rack.

[0012] Furthermore, the sliding assembly includes: A support rod with one end fixed on the straight rod, wherein the side surface of the straight rod is provided with a surface groove; A surface plate slidably connected to the surface groove, wherein the upper surface of the surface plate is provided with a guide groove; A first electromagnet disposed at one end of the surface groove and a second electromagnet disposed at the other end of the surface groove, wherein the first electromagnet and the second electromagnet are both used to generate suction force on the surface plate after being energized; A guide rod fixed on the supporting rod is a polygonal rod, and the through hole matches the supporting rod. The bottom end of the guide rod is slidably connected to the guide groove, and the guide groove includes a protruding groove and flat grooves on both sides of the protruding groove. When the guide rod passes through the protruding groove, the supporting rod completely leaves the adjustment area.

[0013] Furthermore, the mixing device also includes: A sealing ring with an outer diameter equal to the inner diameter of the second cylinder, the sealing ring is provided with a notch, when the notch coincides with the material opening, the material opening is opened, and a gear ring is provided on the outer surface of the sealing ring; a fourth motor disposed on the second cylinder and a second gear mounted on the output shaft of the fourth motor, wherein the second gear is meshed with the gear ring through an opening disposed on the second cylinder; A reflux cylinder connecting the feeding end of the first cylinder and the discharging end of the second cylinder, wherein the height of the discharging end of the second cylinder in the vertical direction is greater than the height of the feeding end of the first cylinder in the vertical direction; A partition plate is provided with a sliding hole, the second push shaft is slidably connected to the sliding hole, and the partition plate is used to isolate the second cylinder from the reflux cylinder; A second telescopic cylinder is arranged on the second cylinder body, and an output shaft of the second telescopic cylinder is connected to the partition plate.

[0014] The beneficial effects of the present invention are as follows: by using a mixing device for a plastic extruder of the present invention, different raw materials are put into each hopper, and the opening of the inlet is controlled by the opening valve in the hopper, so that the ratio of each raw material entering the first barrel is the same as the ratio of raw materials required for the plastic product in the same time period. Before the raw materials in the hopper enter the first barrel, the heating system and the transmission system in the plastic extruder are started, and at the same time, the first motor and the second motor are started, so that the first spiral blade and the second spiral blade start to rotate. After waiting for a period of time, the heat generated by the heating system will be radiated to the inside of the first barrel and the second barrel through the barrel. Then, the opening valve controls the opening of the inlet to open the corresponding opening, so that each raw material enters the first barrel, and when entering the transition barrel, it moves into the second barrel under the action of gravity, and finally enters the barrel from the material port, and is transmitted and mixed through the transmission system in the plastic extruder. Since the raw materials have been fully preheated before entering the barrel, the raw materials can be melted faster after entering the heating system area in the extruder, thereby effectively reducing the situation that the particles of the plastic raw materials cannot be fully melted when passing through the heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the first cylinder in the present invention; Figure 3 It is a structural schematic diagram of the second cylinder in the present invention; Figure 4 It is a partial internal schematic diagram of the second cylinder in the present invention; Figure 5 It is a structural schematic diagram of the sealing ring in the present invention; Figure 6 It is a cross-sectional view at the material inlet position of the present invention; Figure 7 It is a partial enlarged view of the transition tube in the present invention; Figure 8 for Figure 7 The enlarged view of point A in the middle; Fig. 9 for Figure 7 The enlarged view of point B in the middle; Fig.10 for Figure 7 Enlarged view of point C in the middle; Fig.11 It is a schematic diagram of the connection between the surface plate and the guide rod in the present invention; Fig.12 It is a partial cross-sectional view of the straight rod in the present invention; Fig.13 A partial cross-sectional view of the transition tube in the present invention Figure 1 ; Fig.14 for Fig.13 The enlarged view of point D in the middle; Fig.15 for Fig.13 Enlarged view of point E in the middle; Fig.16 for Fig.13 The enlarged view of F in the middle; Fig.17 for Fig.13 Enlarged view of G in the middle; Fig.18 for Fig.13 The enlarged view of the H in the middle; Fig.19 is an enlarged view of the fixing plate in the present invention; Fig. 20 A partial cross-sectional view of the transition tube in the present invention Figure 2 ; Fig.21 for Fig. 20 The enlarged view of point I in the middle; Fig. 22 for Fig. 20 The enlarged view of J in the middle; Fig.23 for Fig. 20 Enlarged view of K in the middle; Fig.24 It is a schematic diagram of the material receiving plate in the present invention.

[0017] The markings in the figure are: 1. Cylinder; 2. First cylinder; 3. Second cylinder; 4. Hopper; 5. Transition cylinder; 6. Convex cavity; 7. Perforation; 8. Fixed plate; 9. Bottom groove; 10. First telescopic cylinder; 11. Third motor; 12. Reel; 13. Pull rope; 14. Movable plate; 15. First pressure sensor; 16. Moving block; 17. Fourth guide wheel; 18. Third guide wheel; 19. Perforation; 20. Spring; 21. Limit block; 22. Second pressure sensor; 23. CCD camera; 24. Limit plate; 25. Side plate; 26. Guard plate; 27. Second rotating shaft; 28. Second shaft hole; 29. ​​Ladder; 30. Through hole; 31. Material receiving plate; 32. First rotating shaft; 33. First shaft hole; 34. Articulated rod; 37. First slider; 38. first slide groove; 39. first rope hole; 40. rope groove; 41. first guide wheel; 42. second slider; 43. second slide groove; 44. wheel groove; 45. second guide wheel; 46. second rope hole; 47. groove; 48. light source; 49. straight rod; 50. support rod; 51. straight rack; 52. surface groove; 53. first electromagnet; 54. second electromagnet; 55. surface plate; 56. guide groove; 57. guide rod; 58. first gear; 59. material port; 60. second gear; 61. sealing ring; 62. fourth motor; 63. reflux cylinder; 64. second telescopic cylinder; 65. partition plate; 66. slide hole; 67. first push shaft; 68. first spiral blade; 69. second push shaft; 70. second spiral blade. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] In a first aspect of the present invention, a mixing device for a plastic extruder is provided, such as Figure 1 , Figure 2 , Figure 3, Figure 4 , Figure 6 As shown, the extruder includes a barrel 1. Other parts of the plastic extruder (not shown in the figure), such as a heating system, a transmission system, and a frame supporting the barrel 1, are all prior art and will not be described in detail herein. The mixing device includes: The first conveying mechanism includes a first cylinder 2, a first push shaft 67 rotatably arranged in the first cylinder 2, a first spiral blade 68 arranged on the side surface of the first push shaft 67, and a first motor for driving the first push shaft 67 to rotate; The second conveying mechanism includes a second cylinder 3, a second push shaft 69 rotatably arranged in the second cylinder 3, a second spiral blade 70 arranged on the side surface of the second push shaft 69, and a second motor for driving the second push shaft 69 to rotate; Here, the first motor and the second motor are both fixed on the frame; A transition barrel 5 is connected between the discharge end of the first barrel 2 and the feed end of the second barrel 3. In the vertical direction, the height of the discharge end of the first barrel 2 is greater than the height of the feed end of the second barrel 3, so that the material entering the transition barrel 5 moves toward the second barrel 3 under the action of gravity. The transition barrel 5 here may be located in front of the extruder head. In the actual plastic extrusion process, since the finished plastic product is soft after extrusion, the plastic product can be guided to avoid the transition barrel 5 after extrusion; A plurality of hoppers 4 are arranged on the feeding end of the first cylinder 2, the hoppers 4 are connected to the first cylinder 2 through an inlet, and an opening valve for controlling the opening degree is arranged on the inlet; The side surface of the first barrel 2 and the side surface of the second barrel 3 are both fixedly connected to the side surface of the barrel 1 , and a material port 59 communicating with the inside of the barrel 1 is provided at the discharge end of the second barrel 3 .

[0021] In this embodiment, different raw materials are placed in each hopper 4, and the opening degree of the inlet is controlled by the opening valve in the hopper 4, so that the ratio of each raw material entering the first barrel 2 is the same as the ratio of raw materials required for the plastic product in the same time period. Before the raw materials in the hopper 4 enter the first barrel 2, the heating system and the transmission system in the plastic extruder are started, and at the same time, the first motor and the second motor are started, so that the first spiral blade 68 and the second spiral blade 70 start to rotate. After waiting for a period of time, the heat generated by the heating system will be radiated to the inside of the first barrel 2 and the second barrel 3 through the barrel 1, and then, the opening valve controls the opening of the inlet to a corresponding degree, so that each raw material enters the first barrel 2, and when entering the transition barrel 5, it moves to the second barrel 3 under the action of gravity, and Finally, the raw materials enter the barrel 1 through the material port 59 and are transported and mixed through the transmission system in the plastic extruder. Since the raw materials have been fully preheated before entering the barrel 1 (the various components in the raw materials are still in granular form during the preheating process), the raw materials can melt faster after entering the heating system area in the extruder, thereby effectively reducing the situation where the particles of the plastic raw materials cannot be fully melted when passing through the heating system. Of course, some stirring mechanisms can also be added to the hopper 4 to prevent the inlet from being blocked by the raw materials. When the raw materials are transported and pushed by the first spiral blade 68 and the second spiral blade 70, the raw materials will be mixed with each other to achieve a preliminary mixing function, so that when they are transported through the transmission system in the plastic extruder, the mixing will be more uniform.

[0022] In addition, in order to make the raw materials mixed more evenly when passing through the first barrel 2 and the second barrel 3, the side surface of the first push shaft 67, the side surface of the second push shaft 69, the surface of the first spiral blade 68 and the surface of the second spiral blade 70 are all provided with stirring rods of different lengths (not shown in the figure), so that the stirring rods can mix more evenly during transportation.

[0023] As an implementation method, Figure 1 , Figure 6 , Figure 7 , Fig.10 , Fig.13 , Fig.15 , Fig.16 , Fig.24 As shown, the upper surface of the transition tube 5 bulges upward to form a convex cavity 6, and the top of the convex cavity 6 is provided with a through hole 7 communicating with the outside. The mixing device also includes: The side panels 25 are arranged opposite to each other to form an adjustment area, and the side panels 25 here can be fixed to the frame by a bracket; The movable plate 14 and the guard plate 26 disposed opposite to one side of the movable plate 14, and a temporary storage area is formed between the opposite guard plates 26; A material receiving plate 31 is provided with a first shaft hole 33 and a first rotating shaft 32 fixed in the temporary storage area, and the first rotating shaft 32 is rotatably connected to the first shaft hole 33; the material receiving plate 31 has at least a first state and a second state; when the bottom end of the material receiving plate 31 contacts the side of the movable plate 14, the temporary storage area above the material receiving plate 31 forms a storage space for temporarily storing the sample to be tested, and at this time, the material receiving plate 31 is in the first state; when there is a gap between the bottom end of the material receiving plate 31 and the side of the movable plate 14 for the sample to be tested to pass through, the material receiving plate 31 is in the second state; A first holding portion for keeping the receiving plate 31 in a first state; A first telescopic cylinder 10 is provided in the adjustment area, and an output shaft of the first telescopic cylinder 10 is fixedly connected to the top of the movable plate 14; A mounting plate and a plurality of CCD cameras disposed in the adjustment area are disposed on the mounting plate, a light source 48 is disposed on one side of the mounting plate, and a detection channel for passing the temporary storage area is formed between the CCD camera and the light source 48; The second holding portion is used to keep the material receiving plate 31 in the second state after the temporary storage area moves to above the detection channel.

[0024] In the present embodiment, when the material receiving plate 31 is in the initial position, the material receiving plate 31 is in the first state through the first holding portion, the front end face of the material receiving plate 31 contacts the side wall of the perforation 7, and the perforation 7 is sealed by the guard plate 26 and the movable plate 14, so that the heat loss can be reduced. After a period of time, the movable plate 14 is driven to move downward and enter the convex cavity 6 through the first telescopic cylinder 10. After the movable plate 14 enters the convex cavity 6, the movable plate 14 continues to move downward. Since the transition tube 5 is full of moving raw materials, the movable plate 14 will eventually enter these raw materials. After the front end of the material receiving plate 31 is immersed in the raw materials, a part of the raw materials will enter the temporary storage area and become samples. At this time, the first telescopic cylinder 10 starts to drive the movable plate 14 to move upward, and pass through the perforation 7, and finally move to the top of the detection channel, and then the second holding portion causes the material receiving plate 31 to be moved upward by the first telescopic cylinder 10. The first state enters the second state and remains in the second state, so that the sample will fall through the gap. Since the receiving plate 31 is a plate-like structure, the sample in the temporary storage area will be spread flat at its bottom. After the receiving plate 31 enters the second state, the sample will fall from the gap in a waterfall shape. When the sample falls into the detection channel, the CCD camera takes pictures and videos of the sample when the light source 48 provides sufficient light, captures the information of the falling sample, and transmits the information to the computer. Since the particle size and color of different types of raw materials in the sample are different, the specific proportion of each raw material in the sample can be obtained through computer analysis, so as to judge whether the raw materials are evenly mixed. The fallen sample can re-enter the transition tube 5 through the perforation 7 and continue to be transmitted. After all the samples are tested, the first telescopic cylinder 10 drives the receiving plate 31 to return to its original position. There are many reasons for uneven mixing during the operation of the entire device, such as the inlet between the hopper 4 and the first barrel 2 releases raw materials for a long time, which causes blockage due to the viscosity of the raw materials; or the first push shaft 67 and / or the second push shaft 69 do not stir sufficiently when they rotate. When it is detected that the raw materials are not mixed uniformly in the transition barrel 5, if it is determined that the reason for the uneven mixing is the blockage of the inlet, the inlet can be unblocked. Since it is impossible to judge how many plastic products are produced by these uneven raw materials, inspectors are required to inspect and identify the products at this time; if the reason for the uneven mixing is that the first push shaft 67 and / or the second push shaft 69 do not stir sufficiently when they rotate, this indicates that the amount of each raw material entering the barrel is sufficient, and the rotation speed of the first push shaft 67 and the second push shaft 69 can be accelerated to make the raw materials in the first barrel 2 and the second barrel 3 turn over more frequently, or the first push shaft 67 and the second push shaft 69 are reversed and then rotated forward, and repeated several times so that the stirring rod can stir sufficiently, and then the rotation speed of the first push shaft 67 and the second push shaft 69 is increased to ensure the uniformity of mixing.The above-mentioned sampling method can detect the mixing uniformity of raw materials once every period of time, such as one hour, and the detection process does not affect the normal production of plastic products. In the existing plastic extruder, although the transmission system can also realize the mixing function, it cannot realize the measurement of mixing uniformity. Through this embodiment, the measurement of mixing uniformity can be realized. Therefore, in this device, the part with mixing function in the transmission system of the plastic extruder can be removed to reduce the duplication of mixing function, and at the same time, the length of the plastic extruder is shortened, so that the space utilization rate of the factory building is higher.

[0025] Here, a structure of a first holding portion is introduced, such as Figure 1 , Figure 7 , Fig.10 , Fig.13 , Fig.14 , Fig. 20 , Fig. 22 , Fig.23 As shown, the first holding portion includes: A hinge rod 34 with one end hinged to the inner side surface of the material receiving plate 31 and a first slider 37 hinged to the other end of the hinge rod 34, wherein the first slider 37 is slidably connected to a first slide groove 38 provided on the side surface of the movable plate 14, and the first slide groove 38 is located above the temporary storage area; A first guide wheel 41 is provided on one side of the movable plate 14. The first guide wheel 41 and the guard plate 26 are located on different sides of the movable plate 14. The first guide wheel 41 is located below the first slider 37. A first rope hole 39 is provided at the bottom of the first slide groove 38. A pull rope 13 with one end fixed to the bottom of the first slider 37, the pull rope 13 passes through the first rope hole 39 and passes around the first guide wheel 41; The third motor 11 is fixed in the adjustment area and the reel 12 is arranged on the output shaft of the third motor 11 . The other end of the pull rope 13 is fixed in the rope groove 40 of the reel 12 .

[0026] In this embodiment, the pull rope 13 is used to give the first slider 37 a downward pulling force, so that the hinge rod 34 applies a downward thrust to the material receiving plate 31. In this way, after the material receiving plate 31 rotates to the point where its bottom end contacts the side of the movable plate 14, the two will directly generate a certain pressure, so that the material receiving plate 31 remains in the first state. When the movable plate 14 moves up and down, the third motor 11 controls the release or reeling of the pull rope 13 according to the lifting speed of the movable plate 14 to ensure that the bottom of the material receiving plate 31 always contacts the side of the movable plate 14. When the temporary storage area moves to the top of the detection channel, the third motor 11 releases a certain length of the pull rope 13, so that the pull rope 13 is in a certain degree of relaxation at this time, and then the second holding part rotates the front end of the material receiving plate 31 upward, so that the pull rope 13 is tightened again. At this time, the material receiving plate 31 will be in the second state, and the sample will fall from the gap.

[0027] As an implementation method, Figure 1 , Figure 7 , Fig.10 , Fig.13 , Fig.14 , Fig.15 , Fig.18 , Fig.19 , Fig. 20 , Fig. 22 , Fig.23 As shown, the mixing device also includes: The fixed plate 8 is fixed to the side wall of the through hole 7, and the side of the movable plate 14 facing away from the hinge rod 34 is in contact with the side of the fixed plate 8 facing the movable plate 14. The bottom of the fixed plate 8 is provided with a bottom groove 9 located below the through hole 7, a part of the bottom groove 9 is located in the convex cavity 6, and the other part of the bottom groove 9 extends to the inside of the transition tube 5; A second slider 42 is disposed on the side of the movable plate 14 facing away from the hinge rod 34, and the second slider 42 is slidably connected to a second slide groove 43 disposed on the side of the movable plate 14 to ensure the stability of the movable plate 14 when sliding; A second guide wheel 45, a wheel groove 44 is provided at the top of the bottom groove 9, a second rope hole 46 is provided at the top of the wheel groove 44 and passes through the top of the fixing plate 8, and the second guide wheel 45 is arranged in the wheel groove 44; the pull rope 13 passes through the second rope hole 46 and bypasses the second guide wheel 45; A rope groove 40 communicating with the first rope hole 39 is provided at the bottom of the side of the movable plate 14 facing the fixed plate 8, and a first guide wheel 41 is provided in the rope groove 40; A groove 47 is formed on one side of the fixing plate 8 , and a light source 48 is disposed in the groove 47 .

[0028] In this embodiment, since the gap is located directly above the edge of the perforation 7 when the receiving plate 31 is in the second state, the fallen sample can easily fall to the outside of the perforation 7. The fixing plate 8 can intercept the sample and make it fall into the perforation 7.

[0029] As an implementation method, Figure 1 , Figure 7 , Fig.10 , Fig.13 , Fig.14 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 As shown, the first holding portion further includes: A third guide wheel 18 is provided in the adjustment area, and the third guide wheel 18 is located above the fixed plate 8; A moving block 16 slidably connected to a through slot 19 provided on the side plate 25, the moving block 16 being located between the third motor 11 and the third guide wheel 18; A fourth guide wheel 17 is provided on the moving block 16, and the pull rope 13 passes around the third guide wheel 18 and the fourth guide wheel 17 in sequence; A spring 20 having one end fixed to one end of the through slot 19, and the other end of the spring 20 fixed to the moving block 16; A first pressure sensor 15 is disposed at the other end of the through slot 19 .

[0030] In this embodiment, the first pressure sensor 15 senses the pressure of the moving block 16, and the spring 20 is in a stretched state. At this time, the tension of the pull rope 13 is large enough to keep the material receiving plate 31 in the first state. After the temporary storage area moves to the top of the detection channel, the third motor 11 releases the pull rope 13 through the reel 12, and the spring 20 contracts. After the spring 20 contracts for a certain distance, the pull rope 13 is relatively loose, and the second retaining portion can apply an upward force to the front end of the material receiving plate 31, thereby pushing the first slider 37 through the hinge rod 34, and pulling the moving block 16 to move in the direction of the first pressure sensor 15 through the pull rope 13. When the material receiving plate 31 rotates from the first state to the second state, the second retaining portion keeps the material receiving plate 31 in the second state. After all samples have been tested, the second holding part removes the holding state of the material receiving plate 31. Under the action of the contraction force of the spring 20, the material receiving plate 31 immediately returns to the first state. The third motor 11 rewinds the pull rope 13, so that the moving block 16 stretches the spring 20 again, so that the moving block 16 abuts against the first pressure sensor 15, so that the first pressure sensor 15 feels the pressure of the moving block 16, and the pressure between the bottom end of the material receiving plate 31 and the side of the movable plate 14 will be greater. Then, through the first telescopic cylinder 10, the material receiving plate 31 moves into the perforation 7. When the temporary storage area moves to the transition tube 5 for sampling again, due to the greater pressure between the bottom end of the material receiving plate 31 and the side of the movable plate 14, it can be ensured that when the material receiving plate 31 moves from top to bottom into the raw material flowing in the transition tube 5, the stability of the material receiving plate 31 can be ensured, and it can always remain in the first state.

[0031] As an implementation method, Figure 1 , Figure 7 , Figure 8 , Fig.10 , Fig.13 , Fig.16 As shown, the second holding portion includes: The second rotating shaft 27 and the limiting plate 24 with a second shaft hole 28 on the top, the second rotating shaft 27 is fixed in the adjustment area, and the second rotating shaft 27 is fixed in the second shaft hole 28, when the limiting plate 24 is in a vertical state, the plane where the limiting plate 24 is located and the plane where the fixed plate 8 is located form an incoming material channel for the temporary storage area to pass through; The lever 29 is provided with a through hole 30 on the side plate 25, and the lever 29 is slidably connected with the through hole 30. After the lever 29 extends into the adjustment area, it is located in the incoming material channel; A sliding assembly for driving the lever 29 to slide along the through hole 30; A rotating assembly for driving the second rotating shaft 27 to rotate.

[0032] In this embodiment, after sampling in the temporary storage area, the temporary storage area will carry the sample through the first telescopic cylinder 10 to move into the incoming material channel, and then, the lever 29 will move to the outside of the incoming material channel under the action of the sliding component. After the lever 29 is completely separated from the incoming material channel, the rotating component drives the second rotating shaft 27 to rotate. After the limit plate 24 is rotated to an inclined state, the sliding component is used again to make a part of the lever 29 enter the adjustment area. At this time, the rotating component removes the force on the second rotating shaft 27. Under the action of gravity, the side of the limit plate 24 will maintain contact with the lever 29 to maintain the inclined state of the limit plate 24. State, so that the distance between the front end of the material receiving plate 31 and the fixed plate 8 is greater than the distance between the bottom end of the limit plate 24 and the fixed plate 8. After completion, when the first telescopic cylinder 10 drives the movable plate 14 to move downward, similarly, at this time, the third motor 11 also starts to release the pull rope 13 when the movable plate 14 moves downward, so that in this process, the tension of the pull rope 13 is stable. When the front end of the material receiving plate 31 contacts the inner side of the limit plate 24, when the movable plate 14 continues to move downward, the front end of the material receiving plate 31 will rotate upward, so that the material receiving plate 31 finally rotates to the second state, and then the first telescopic cylinder 10 stops driving. When all samples are tested, the first telescopic cylinder 10 moves the movable plate 14 upward, so that the material receiving plate 31 returns to the first state, and then the sliding assembly makes the lever 29 completely out of the adjustment area, and then the limit plate 24 is restored to the vertical state by the rotating assembly. After a part of the lever 29 enters the adjustment area again, the material receiving plate 31 is restored to its original position by the first telescopic cylinder 10.

[0033] As an implementation method, Figure 1 , Figure 7 , Figure 8 , Fig.10 , Fig.13 , Fig.16 , Fig.17 , Fig. 20 , Fig.21 As shown, the rotating assembly includes: A limit block 21 disposed at the edge of the through groove 19 and a second pressure sensor 22 disposed on the limit block 21, the second pressure sensor 22 facing the moving block 16; A straight rod 49 located outside the side plate 25, one end of the straight rod 49 is fixed to the moving block 16; The spur rack 51 provided on the straight rod 49 and the first gear 58 installed on the second rotating shaft 27 , the spur rack 51 matches the first gear 58 , and when the spur rack 51 passes under the second rotating shaft 27 , the first gear 58 meshes with the spur rack 51 .

[0034] In this embodiment, after the temporary storage area moves to the incoming material channel, the third motor 11 starts to release the pull rope 13. At this time, the spring 20 will contract, causing the moving block 16 to move in the direction of the limit block 21. During the movement of the moving block 16, the straight rod 49 starts to move simultaneously, and the spur rack 51 will move in the direction of the first gear 58. During this process, the sliding assembly causes the lever 29 to move completely outside the adjustment area, and then the spur rack 51 engages with the first gear 58 to drive the limit plate 24 to rotate. After the limit plate 24 rotates past the position of the lever 29, the sliding assembly causes a portion of the lever 29 to re-enter the adjustment area, and after the spur rack 51 disengages from the first gear 58, the limit plate 24 rotates downward under the action of gravity, and finally passes through the lever. Rod 29 supports the limit plate 24. At this time, the limit plate 24 is still in an inclined state. After the second pressure sensor 22 senses the pressure of the moving block 16, the third motor 11 stops driving. At this time, the material plate 31 is still in the first state. When the first telescopic cylinder 10 drives the temporary storage area to move a distance, the front end of the limit plate 24 will contact the inner side of the limit plate 24. At this time, the first telescopic cylinder 10 only needs to drive the movable plate 14 to move downward a short distance, and the material plate 31 will enter the second state. In this process, although the moving block 16 will move a short distance toward the first pressure sensor 15 due to the material plate 31 entering the second state, it will not cause the first gear 58 to contact the spur rack 51, and will not affect the state of the limit plate 24. When all the samples have been tested, the first telescopic cylinder 10 drives the movable plate 14 to move upward, and the material receiving plate 31 returns to the first state. Then the third motor 11 causes the pull rope 13 to reel in, and the moving block 16 begins to move toward the first pressure sensor 15. In this process, the sliding assembly causes the lever 29 to move completely to the outside of the adjustment area. Although the spur rack 51 will still contact the first gear 58 and drive the limit plate 24 to move, after the spur rack 51 is separated from the first gear 58, the limit plate 24 will still return to the vertical state under the action of gravity. Finally, the sliding assembly causes the lever 29 to extend into the adjustment area again.

[0035] As an implementation method, Figure 1 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.16 , Fig.17 , Fig. 20 , Fig.21 As shown, the sliding assembly includes: A support rod 50 having one end fixed to the straight rod 49, and a surface groove 52 is provided on the side surface of the straight rod 49; A surface plate 55 slidably connected to the surface groove 52, wherein a guide groove 56 is provided on the upper surface of the surface plate 55; A first electromagnet 53 disposed at one end of the surface slot 52 and a second electromagnet 54 disposed at the other end of the surface slot 52, wherein the first electromagnet 53 and the second electromagnet 54 are both used to generate a suction force on the surface plate 55 after being energized; The guide rod 57 is fixed on the lever 29, the lever 29 is a polygonal rod, and the through hole 30 matches the lever 29. The bottom end of the guide rod 57 is slidably connected to the guide groove 56. The guide groove 56 includes a protruding groove and flat grooves on both sides of the protruding groove. When the guide rod 57 passes through the protruding groove, the lever 29 completely leaves the adjustment area.

[0036] In this embodiment, after the temporary storage area moves to the incoming material channel, the third motor 11 starts to release the pull rope 13. At this time, the spring 20 will contract, so that the moving block 16 moves in the direction of the limit block 21. During the movement of the moving block 16, the straight rod 49 starts to move at the same time, and the straight rack 51 will move in the direction of the first gear 58. In this process, the second electromagnet 54 is energized first, so that the surface plate 55 moves to the end of the guide groove 56 where the second electromagnet 54 is located. Here, it is assumed that one of the flat grooves is the first groove and the other flat groove is the second groove. At this time, the guide rod 57 is located in the first groove and close to the protruding groove. When the moving block 16 moves a short distance, the guide rod 57 will move into the protruding groove, so that the lever 29 moves to the outside of the adjustment area. At this time, the moving block 16 continues to move toward the limit block 21, and the guide rod 57 remains in the protruding groove. After the spur rack 51 meshes with the first gear 58 and the limit plate 24 rotates to a certain degree of inclination, the guide rod 57 moves into the second groove, and after moving a distance in the second groove, the spur rack 51 separates from the first gear 58. When the moving block 16 contacts the second pressure sensor 22 of the limit block 21, there is also a distance between the spur rack 51 and the first gear 58. At this time, the first telescopic cylinder 10 is used to make the material receiving plate 31 in the second state, and the moving block 16 will move a short distance toward the first pressure sensor 15, but it will not affect the state of the limit plate 24 and the lever 29. When all the samples have been tested, after the first telescopic cylinder 10 moves the movable plate 14 upward and the material receiving plate 31 returns to the first state, the moving block 16 will contact the second pressure sensor 22, and then the second electromagnet 54 loses power and the first electromagnet 53 is energized, so that the surface plate 55 moves to the end of the surface groove 52 where the first electromagnet 53 is located. At this time, although the guide rod 57 is in the second groove, it will be very close to the protruding groove. When the third motor 11 reels the pull rope 13, the spur rack 51 approaches the first gear 58, and the guide rod 57 will enter the protruding groove, so that the lever 29 moves to the outside of the adjustment area. In this way, regardless of whether the spur rack 51 is engaged with the first gear 58, the limit plate 24 will eventually be in a vertical state, and then the guide rod 57 moves to the first groove, and the lever 29 returns to its original position. At this time, the moving block 16 moves to the position of the first pressure sensor 15, and the third motor 11 stops driving.

[0037] As an implementation method, Figure 1 , Figure 4 , Figure 5 , Figure 6 As shown, the mixing device also includes: A sealing ring 61 having an outer diameter equal to the inner diameter of the second cylinder 3, the sealing ring 61 is provided with a notch, when the notch coincides with the material opening 59, the material opening 59 is opened, and a gear ring is provided on the outer surface of the sealing ring 61; A fourth motor 62 is provided on the second cylinder 3 and a second gear 60 is mounted on the output shaft of the fourth motor 62, and the second gear 60 is meshed with the gear ring through an opening provided on the second cylinder 3; A reflux cylinder 63 connecting the feeding end of the first cylinder 2 and the discharging end of the second cylinder 3, wherein the height of the discharging end of the second cylinder 3 in the vertical direction is greater than the height of the feeding end of the first cylinder 2 in the vertical direction; A partition plate 65 having a sliding hole 66 is provided, and a second push shaft 69 is slidably connected to the sliding hole 66. The partition plate 65 is used to isolate the second cylinder 3 from the reflux cylinder 63; The second telescopic cylinder 64 is provided in the second cylinder 3 , and the output shaft of the second telescopic cylinder 64 is connected to the partition plate 65 .

[0038] In this embodiment, when the raw materials are mixed evenly, the notch coincides with the material port 59, and the partition plate 65 isolates the second barrel 3 from the reflux barrel 63, so that the raw materials can enter the barrel 1 through the material port 59. However, when the raw materials are mixed unevenly, the fourth motor 62 drives the sealing ring 61 to rotate so that the sealing ring 61 seals the material port 59, and then the second telescopic cylinder 64 moves the partition plate 65 to a position close to the bottom of the second barrel 3, so that the second barrel 3 is connected to the reflux barrel 63, and then the unevenly mixed raw materials re-enter the first barrel 2 through the reflux barrel 63, so that the raw materials are circulated and mixed again in the first barrel 2 and the second barrel 3. When the raw materials are mixed evenly, the sealing ring 61 returns to its original position, so that the material port 59 is connected to the second barrel 3 again, and the reflux barrel 63 is isolated from the second barrel 3 through the partition plate 65.

[0039] Here, the first telescopic cylinder 10 and the second telescopic cylinder 64 may be pneumatic cylinders or hydraulic cylinders.

[0040] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0041] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mixing device for a plastic extruder, the extruder comprising a barrel (1), characterized in that: The mixing device comprises: The first conveying mechanism comprises a first cylinder (2), a first push shaft (67) rotatably arranged in the first cylinder (2), a first spiral blade (68) arranged on the side surface of the first push shaft (67), and a first motor for driving the first push shaft (67) to rotate; The second conveying mechanism comprises a second cylinder (3), a second push shaft (69) rotatably arranged in the second cylinder (3), a second spiral blade (70) arranged on the side surface of the second push shaft (69), and a second motor for driving the second push shaft (69) to rotate; A transition cylinder (5) connecting the discharge end of the first cylinder (2) and the feed end of the second cylinder (3), wherein in the vertical direction, the height of the discharge end of the first cylinder (2) is greater than the height of the feed end of the second cylinder (3), so that the material entering the transition cylinder (5) moves in the direction of the second cylinder (3) under the action of gravity; A plurality of hoppers (4) are arranged on the feeding end of the first cylinder (2), the hoppers (4) are connected to the first cylinder (2) via an inlet, and an opening valve for controlling the opening of the inlet is arranged on the inlet; The side surface of the first barrel (2) and the side surface of the second barrel (3) are both fixedly connected to the side surface of the barrel (1), and the discharge end of the second barrel (3) is provided with a material port (59) communicating with the interior of the barrel (1).

2. A mixing device for a plastic extruder according to claim 1, characterized in that: The side surface of the first push shaft (67), the side surface of the second push shaft (69), the surface of the first spiral blade (68) and the surface of the second spiral blade (70) are all provided with stirring rods of different lengths.

3. A mixing device for a plastic extruder according to claim 1 or 2, characterized in that: The upper surface of the transition tube (5) is convex upward to form a convex cavity (6), and the top of the convex cavity (6) is provided with a through hole (7) communicating with the outside. The mixing device also includes: Side panels (25) arranged opposite to each other to form an adjustment area; A movable plate (14) and a guard plate (26) arranged opposite to one side of the movable plate (14), wherein a temporary storage area is formed between the opposite guard plates (26); A material receiving plate (31) is provided with a first shaft hole (33) and a first rotating shaft (32) fixed in the temporary storage area, wherein the first rotating shaft (32) is rotatably connected to the first shaft hole (33); the material receiving plate (31) has at least a first state and a second state; when the bottom end of the material receiving plate (31) contacts the side of the movable plate (14), the temporary storage area above the material receiving plate (31) forms a storage space for temporarily storing samples to be tested, and at this time, the material receiving plate (31) is in the first state; when there is a gap between the bottom end of the material receiving plate (31) and the side of the movable plate (14) for the samples to be tested to pass through, the material receiving plate (31) is in the second state; A first holding portion for keeping the receiving plate (31) in a first state; A first telescopic cylinder (10) is arranged in the adjustment area, and an output shaft of the first telescopic cylinder (10) is fixedly connected to the top of the movable plate (14); A mounting plate arranged in the adjustment area and a plurality of CCD cameras arranged on the mounting plate, a light source (48) being arranged on one side of the mounting plate, and a detection channel for allowing the temporary storage area to pass through being formed between the CCD camera and the light source (48); A second holding portion is used to keep the material receiving plate (31) in a second state after the temporary storage area moves to above the detection channel.

4. A mixing device for a plastic extruder according to claim 3, characterized in that: The first holding portion comprises: A hinge rod (34) with one end hinged to the inner side surface of the material receiving plate (31) and a first sliding block (37) hinged to the other end of the hinge rod (34), the first sliding block (37) being slidably connected to a first sliding groove (38) provided on the side surface of the movable plate (14), the first sliding groove (38) being located above the temporary storage area; A first guide wheel (41) is arranged on one side of the movable plate (14), the first guide wheel (41) and the guard plate (26) are located on different sides of the movable plate (14), and the first guide wheel (41) is located below the first sliding block (37), and a first rope hole (39) is provided at the bottom of the first sliding groove (38); A pull rope (13) with one end fixed to the bottom of the first sliding block (37), wherein the pull rope (13) passes through the first rope hole (39) and passes around the first guide wheel (41); A third motor (11) is fixed in the adjustment area and a reel (12) is arranged on the output shaft of the third motor (11), and the other end of the pull rope (13) is fixed in the rope groove (40) of the reel (12).

5. A mixing device for a plastic extruder according to claim 4, characterized in that: The mixing device also includes: A fixed plate (8) is fixed to the side wall of the through hole (7), the side of the movable plate (14) facing away from the hinge rod (34) is in contact with the side of the fixed plate (8) facing the movable plate (14), and a bottom groove (9) is provided at the bottom of the fixed plate (8) below the through hole (7), a part of the bottom groove (9) is located in the convex cavity (6), and another part of the bottom groove (9) extends to the inside of the transition tube (5); A second sliding block (42) is arranged on the side of the movable plate (14) facing away from the hinge rod (34), and the second sliding block (42) is slidably connected to a second sliding groove (43) arranged on the side of the movable plate (14); A second guide wheel (45), wherein a wheel groove (44) is provided at the top of the bottom groove (9), a second rope hole (46) penetrating the top of the fixing plate (8) is provided at the top of the wheel groove (44), and the second guide wheel (45) is arranged in the wheel groove (44); the pull rope (13) passes through the second rope hole (46) and bypasses the second guide wheel (45); A rope groove (40) communicating with the first rope hole (39) is provided at the bottom of the side surface of the movable plate (14) facing the fixed plate (8), and the first guide wheel (41) is arranged in the rope groove (40); A groove (47) is provided on one side of the fixing plate (8), and the light source (48) is arranged in the groove (47).

6. A mixing device for a plastic extruder according to claim 5, characterized in that: The first holding portion further comprises: A third guide wheel (18) is arranged in the adjustment area, and the third guide wheel (18) is located above the fixed plate (8); A moving block (16) slidably connected to a through slot (19) provided on the side plate (25), wherein the moving block (16) is located between the third motor (11) and the third guide wheel (18); a fourth guide wheel (17) provided on the moving block (16), wherein the pull rope (13) passes around the third guide wheel (18) and the fourth guide wheel (17) in sequence; A spring (20) with one end fixed to one end of the through slot (19), and the other end of the spring (20) fixed to the moving block (16); A first pressure sensor (15) is arranged at the other end of the through groove (19).

7. A mixing device for a plastic extruder according to claim 6, characterized in that: The second holding portion comprises: A second rotating shaft (27) and a limiting plate (24) with a second shaft hole (28) on the top, the second rotating shaft (27) is fixed in the adjustment area, and the second rotating shaft (27) is fixed in the second shaft hole (28), when the limiting plate (24) is in a vertical state, a material incoming channel for the temporary storage area to pass through is formed between the plane where the limiting plate (24) is located and the plane where the fixing plate (8) is located; A lever (29), wherein a through hole (30) is provided on the side plate (25), the lever (29) is slidably connected to the through hole (30), and after the lever (29) extends into the adjustment area, it is located in the incoming material channel; A sliding assembly for driving the lever (29) to slide along the through hole (30); A rotating assembly for driving the second rotating shaft (27) to rotate; After the lever (29) is completely separated from the material input channel, the limit plate (24) rotates to an inclined state, and after a portion of the lever (29) enters the adjustment area, the side surface of the limit plate (24) maintains contact with the lever (29), maintaining the inclined state of the limit plate (24), so that the distance between the front end of the receiving plate (31) and the fixed plate (8) is greater than the distance between the bottom end of the limit plate (24) and the fixed plate (8).

8. A mixing device for a plastic extruder according to claim 7, characterized in that: The rotating assembly comprises: A limit block (21) provided at the edge of the through groove (19) and a second pressure sensor (22) provided on the limit block (21), wherein the second pressure sensor (22) faces the moving block (16); A straight rod (49) located outside the side plate (25), one end of the straight rod (49) being fixed to the moving block (16); A spur rack (51) is arranged on the straight rod (49) and a first gear (58) is installed on the second rotating shaft (27). The spur rack (51) matches the first gear (58). When the spur rack (51) passes under the second rotating shaft (27), the first gear (58) meshes with the spur rack (51).

9. A mixing device for a plastic extruder according to claim 8, characterized in that: The sliding assembly comprises: A support rod (50) having one end fixed to a straight rod (49), wherein a surface groove (52) is provided on a side surface of the straight rod (49); a surface plate (55) slidably connected to the surface groove (52), wherein the upper surface of the surface plate (55) is provided with a guide groove (56); A first electromagnet (53) disposed at one end of the surface groove (52) and a second electromagnet (54) disposed at the other end of the surface groove (52), wherein the first electromagnet (53) and the second electromagnet (54) are both used to generate a suction force on the surface plate (55) after being energized; A guide rod (57) is fixed on the lever (29), the lever (29) is a polygonal rod, and the through hole (30) matches the lever (29), the bottom end of the guide rod (57) is slidably connected to the guide groove (56), the guide groove (56) includes a protruding groove and flat grooves located on both sides of the protruding groove, and when the guide rod (57) passes through the protruding groove, the lever (29) completely leaves the adjustment area.

10. A mixing device for a plastic extruder according to claim 9, characterized in that: The mixing device also includes: a sealing ring (61) having an outer diameter equal to the inner diameter of the second cylinder (3), the sealing ring (61) being provided with a notch, and when the notch coincides with the material opening (59), the material opening (59) is opened, and a gear ring is provided on the outer surface of the sealing ring (61); A fourth motor (62) is disposed on the second cylinder (3) and a second gear (60) is mounted on the output shaft of the fourth motor (62), wherein the second gear (60) is meshed with the gear ring through an opening disposed on the second cylinder (3); A reflux cylinder (63) connecting the feeding end of the first cylinder (2) and the discharging end of the second cylinder (3), wherein the height of the discharging end of the second cylinder (3) in the vertical direction is greater than the height of the feeding end of the first cylinder (2) in the vertical direction; A partition plate (65) is provided with a sliding hole (66), the second push shaft (69) is slidably connected to the sliding hole (66), and the partition plate (65) is used to isolate the second cylinder (3) from the reflux cylinder (63); A second telescopic cylinder (64) is provided on the second cylinder (3), and an output shaft of the second telescopic cylinder (64) is connected to the partition plate (65).

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