A twin-screw extruder for a biodegradable material

Abstract

The application discloses a kind of biodegradable material's double screw extruder, specifically relates to the field of double screw extruder, including main mechanism, vertical center line position of main mechanism is fixedly installed for the pretreatment mechanism of raw material is pretreated, the inner cavity of pretreatment mechanism is equipped with second filtering mechanism, main mechanism includes first protective shell, the both ends of first protective shell are fixedly connected with second protective shell, and the bottom of two second protective shells is opened with the outlet of the form through the form, first processing roller shaft and second processing roller shaft are rotatably connected between two second protective shells respectively.The first spiral pressing plate and the second spiral pressing plate are set in opposite directions, which can disperse the processing of the raw materials from the center of the first protective shell to both sides, thereby more effectively improving work efficiency and effectively avoiding the problem of slow processing rate caused by traditional material accumulation in the inlet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of double screw extruders, and more particularly to a double screw extruder for biodegradable materials. BACKGROUND

[0002] Biodegradable materials mainly include biodegradable ceramics and biodegradable plastics, which can be completely decomposed into low molecular compounds by microorganisms (such as bacteria, fungi and algae) under appropriate and demonstrable environmental conditions. Biodegradable materials are high molecular materials that can undergo chemical, biological or physical degradation or enzymatic degradation under the action of microorganisms such as bacteria, fungi and algae in nature. The most ideal biodegradable material is obtained from renewable resources and can be reused by organisms after degradation. The product is preferably carbon dioxide and water, so that the production and use of such materials are included in the cycle of nature. Screw extruders are machines that can concentrate a series of basic chemical unit processes, such as solid conveying, pressurization, melting, degassing, dehumidification, melt conveying and pumping, on the screw of the extruder. Compared with single screw extruders, double screw extruders can mix the melt more fully, so they are more widely used.

[0003] Currently, in the process of processing biodegradable materials, the biodegradable materials generally need to be mixed and granulated first. Currently, when granulating such materials, a screw extruder is mostly used.

[0004] However, the existing screw extruder often causes the materials to accumulate in the material inlet when mixing and granulating the materials due to the unevenness of the feed, which in turn causes the materials to be stuck in the machine, thereby affecting the extrusion processing. Therefore, the present application provides a double screw extruder for biodegradable materials to solve the above problems. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present application provide a double screw extruder for biodegradable materials, which is provided with a first spiral pressing plate and a second spiral pressing plate with opposite spiral directions, so that the raw materials can be dispersed and processed from the center of the first protective shell to both sides, thereby solving the problems raised in the above background art.

[0006] To achieve the above object, the present application provides the following technical scheme: a double screw extruder for biodegradable materials, comprising a main body mechanism, a pretreatment mechanism for pretreating raw materials is fixedly installed at the vertical center line position of the main body mechanism, and a second filtering mechanism is arranged in the inner cavity of the pretreatment mechanism.

[0007] The main body mechanism comprises a first protective shell, both ends of the first protective shell are fixedly connected with second protective shells, the bottoms of the two second protective shells are both provided with discharge ports in a penetrating manner, first and second processing roller shafts are rotatably connected between the two second protective shells, the outer walls of the first and second processing roller shafts are respectively fixedly installed with first and second spiral pressing plates, the inner cavities of the second protective shells are rotatably installed with first filtering mechanisms, and the two ends of the second processing roller shaft and the first spiral pressing plate are provided with power mechanisms for driving the two to rotate.

[0008] In a preferred embodiment, a balance plate is fixedly installed at the vertical centerline position of the first protective shell, and the first and second processing roller shafts are rotatably installed inside the balance plate.

[0009] The top of the balance plate is in an umbrella shape.

[0010] In a preferred embodiment, the first and second spiral pressing plates provided on the outer walls of the first and second processing roller shafts are respectively arranged on the two sides of the balance plate, and the spiral directions of the first and second spiral pressing plates are arranged in opposite states.

[0011] In a preferred embodiment, the power mechanism comprises a third rotating shaft rotatably installed on one side of the second protective shell, the third rotating shaft and the second processing roller shaft are arranged in a mutually fixed state, and the end of the third rotating shaft away from the second processing roller shaft is fixedly installed with a second motor.

[0012] The end of the second processing roller shaft away from the third rotating shaft is fixedly connected with a fourth rotating shaft, the two ends of the first processing roller shaft are fixedly connected with fifth rotating shafts, the fourth and fifth rotating shafts are rotatably installed on one side of the second protective shell, and the ends of one of the fifth rotating shafts and the fourth rotating shaft are fixedly installed with first gear plates, and the outer walls of the first gear plates provided on the outer walls of the fourth and fifth rotating shafts are all engaged with synchronous belts.

[0013] In a preferred embodiment, the first filtering mechanism comprises a link-type rotating drum rotatably installed on one side of the second protective shell, one side of the link-type rotating drum is fixedly installed with a first filtering plate, the first filtering plate is attached to the inner wall of the second protective shell, and the inside of the first filtering plate is provided with a plurality of screen holes of uniform size in a penetrating manner.

[0014] In a preferred embodiment, the side of the link-type rotating drum away from the first filtering plate is fixedly installed with an internal gear ring, the outer wall of the fifth rotating shaft is fixedly installed with a second gear plate, and the second gear plate and the internal gear ring are arranged in a mutually engaged state.

[0015] In a preferred embodiment, the pre-processing mechanism comprises a storage cylinder fixedly installed on the top of the first protective shell, an outer wall of the storage cylinder is fixedly installed with a supporting frame, and the supporting frame is fixedly installed on one side of the first protective shell.

[0016] The bottom of the storage cylinder is conically arranged, the storage cylinder is arranged on the vertically central surface of the balance plate, a top cover is fixedly installed on the top of the storage cylinder, and a feeding slot is formed in the top of the top cover.

[0017] In a preferred embodiment, a first motor is fixedly installed on the top of the top cover, a first rotating shaft is fixedly connected to the output shaft end of the first motor, a second rotating rod is fixedly connected to the bottom of the first rotating shaft, and a spiral blade is fixedly installed on the outer wall of the second rotating rod.

[0018] The horizontal cross-sectional length of the spiral blade is consistent with the inner circumferential diameter length of the bottom of the storage cylinder.

[0019] In a preferred embodiment, a first crushing knife for primary crushing of raw materials is fixedly installed on the outer wall of the first rotating shaft, and a second crushing knife for secondary crushing of raw materials is arranged at the bottom of the first crushing knife.

[0020] In a preferred embodiment, a conical limiting guide plate is fixedly installed on the outer wall of the first rotating shaft, a limiting rod fixedly installed on the inner wall of the storage cylinder is arranged at the bottom of the conical limiting guide plate, a reciprocating thread groove is formed in the outer wall of the second rotating rod, a second filter plate is engaged with the outer wall of the reciprocating thread groove, and the second filter plate is sleeved on the outer wall of the limiting rod.

[0021] A scraper is fixedly installed on the outer wall of the first rotating shaft, and a crushing roller is fixedly installed on one side of the scraper.

[0022] Technical effects and advantages of the present application:

[0023] 1. By arranging the first spiral pressing plate and the second spiral pressing plate with opposite spiral directions on the outer walls of the first processing roller shaft and the second processing roller shaft, when the material is placed in the first protective shell, the raw material can be dispersed and processed from the central position of the first protective shell to both sides in response to the rotating first spiral pressing plate and the second spiral pressing plate, thereby more effectively improving the work efficiency, and effectively avoiding the problems of slow processing rate and material jamming between materials caused by traditional material accumulation at the feeding port.

[0024] 2、The first filter plate can be rotated, so that larger materials can be left in the inner cavity of the first protective shell, and in the process of rotation, the large materials are turned to the top of the first spiral pressing plate and the second spiral pressing plate again for re-pressing processing, thereby ensuring that the processed raw materials are relatively uniform in size to some extent, facilitating subsequent processing;

[0025] 3、The raw materials are pretreated and extruded by the pretreatment mechanism and the second filtering mechanism before being poured into the main body mechanism, so that the size of the materials entering the main body mechanism remains relatively uniform, thereby facilitating the processing of the main body mechanism and prolonging the service life of the main body mechanism, which is more convenient for actual use. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0027] Figure 2 It is a schematic diagram of the bottom structure of the present application.

[0028] Figure 3 It is a schematic diagram of the top structure of the main body mechanism of the present application.

[0029] Figure 4 It is an enlarged view of the A part structure of the present application. Figure 3

[0030] Figure 5 It is a partial structure sectional view of the main body mechanism of the present application.

[0031] Figure 6 It is an enlarged view of the B part structure of the present application. Figure 5

[0032] It is an enlarged view of the C part structure of the present application. Figure 7 Figure 5

[0033] Figure 8 It is a partial structure sectional view of the pretreatment mechanism and the second filtering mechanism of the present application.

[0034] Figure 9 It is an enlarged view of the D part structure of the present application. Figure 8

[0035] ​​​​The attached figures are labeled as follows: 1 Main body mechanism, 101 First protective shell, 102 Second protective shell, 103 Discharge port, 104 First processing roller shaft, 105 Second processing roller shaft, 106 First spiral pressure plate, 107 Second spiral pressure plate, 108 Balance plate, 2 Pre-treatment mechanism, 21 Storage cylinder, 22 Support frame, 23 Top cover, 24 Feed trough, 25 First motor, 26 First rotating shaft, 27 First crushing blade, 28 Second crushing blade, 29 Second rotating rod, 210 Spiral blade, 211 Scraper, 212 Crushing roller, 3 Power mechanism, 31 Third rotating shaft, 32 Second motor, 33 Fourth rotating shaft, 34 Fifth rotating shaft, 35 First gear disc, 36 Synchronous belt, 4 First filtering mechanism, 41 Connecting type rotating drum, 42 Internal gear ring, 43 First filter plate, 44 Second gear disc, 5 Second filtering mechanism, 51 Conical limiting guide plate, 52 Limiting rod, 53 Reciprocating threaded groove, 54 Second filter plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Refer to the instruction manual appendix Figures 1-9 An embodiment of the present invention provides a twin-screw extruder for biodegradable materials, such as... Figure 1 As shown, the system includes a main body 1. A pretreatment mechanism 2 for pre-treating raw materials is fixedly installed at the vertical center line position of the main body 1. The inner cavity of the pretreatment mechanism 2 is provided with a second filter mechanism 5. The second filter mechanism 5 is used to further extrude the raw materials in the inner cavity of the pretreatment mechanism 2, so that the material after being processed by the pretreatment mechanism 2 is uniform in size, which makes it easier for the subsequent extrusion processing work to enter the main body 1.

[0038] Reference Figure 2 As shown, the main body 1 includes a first protective shell 101, with second protective shells 102 fixedly connected to both ends of the first protective shell 101. Both second protective shells 102 have through-hole discharge ports 103 at their bottoms. During use, the raw material is fed into the first protective shell 101 via a pre-treatment mechanism 2, and after processing, it leaks out from the discharge port 103. Figure 3As shown, the first processing roller shaft 104 and the second processing roller shaft 105 are respectively rotationally connected between the two second protective shells 102, and the outer walls of the first processing roller shaft 104 and the second processing roller shaft 105 are respectively fixedly installed with the first spiral pressing plate 106 and the second spiral pressing plate 107, so that when the first processing roller shaft 104 and the second processing roller shaft 105 rotate, the first spiral pressing plate 106 and the second spiral pressing plate 107 can perform extrusion processing on the raw materials. The inner cavity of the second protective shell 102 is rotationally installed with the first filtering mechanism 4, which is arranged to filter the raw materials after extrusion processing by the first spiral pressing plate 106 and the second spiral pressing plate 107, so as to prevent the problem of uneven size of the processed materials. The second processing roller shaft 105 and the first spiral pressing plate 106 are both provided with a power mechanism 3 for driving them to rotate.

[0039] As a further expansion of the present solution, with reference to Figure 3 As shown, the balance plate 108 is fixedly installed at the vertical centerline position of the first protective shell 101, and the first processing roller shaft 104 and the second processing roller shaft 105 are rotationally installed inside the balance plate 108. In combination with Figure 6 As shown, the top of the balance plate 108 is umbrella-shaped, specifically the cross section is umbrella-shaped. The purpose of this arrangement is to guide the raw materials to fall to the sides of the balance plate 108 when they contact the top of the balance plate 108, thereby facilitating the subsequent rotation and extrusion work of the first spiral pressing plate 106 and the second spiral pressing plate 107.

[0040] Further, the first spiral pressing plate 106 and the second spiral pressing plate 107 provided on the outer walls of the first processing roller shaft 104 and the second processing roller shaft 105 are respectively arranged on the two sides of the balance plate 108, and the spiral directions of the first spiral pressing plate 106 and the second spiral pressing plate 107 are arranged in opposite states. The purpose of this arrangement is to make the raw materials fall into the first protective shell 101 from the balance plate 108, and then rotate by the first processing roller shaft 104 and the second processing roller shaft 105 rotating in the same direction, so that the first spiral pressing plate 106 and the second spiral pressing plate 107 rotate, and the raw materials gradually move from the balance plate 108 to the second protective shell 102, thereby avoiding the problem of slow processing speed and uneven processing quality caused by the raw materials always accumulating in one place.

[0041] As a further expansion of the present solution, with reference to Figure 7As shown, the power mechanism 3 comprises a third rotating shaft 31 rotatably installed on one side of the second protective shell 102, the third rotating shaft 31 is in a fixed state with the second processing roller shaft 105, and the end of the third rotating shaft 31 away from the second processing roller shaft 105 is fixedly installed with a second motor 32. In use, the second motor 32 is started to drive the second processing roller shaft 105 and the first spiral pressing plate 106 and the second spiral pressing plate 107 on the outer wall of the second processing roller shaft 105 to rotate synchronously. Figure 4 As shown, the end of the second processing roller shaft 105 away from the third rotating shaft 31 is fixedly connected with a fourth rotating shaft 33, and the two ends of the first processing roller shaft 104 are fixedly connected with fifth rotating shafts 34. The fourth rotating shaft 33 and the fifth rotating shafts 34 are rotatably installed on one side of the second protective shell 102, and one of the fifth rotating shafts 34 and one end of the fourth rotating shaft 33 are fixedly installed with a first gear plate 35. The outer walls of the first gear plates 35 provided on the outer walls of the fourth rotating shaft 33 and the fifth rotating shafts 34 are engaged with a synchronous belt 36. In actual use, the second motor 32 is started to drive the second processing roller shaft 105 to rotate, thereby driving the fourth rotating shaft 33 and the first gear plate 35 provided on the outer wall of the fourth rotating shaft 33 to rotate. Further, the first gear plate 35 provided on the outer wall of the fourth rotating shaft 33 is moved by the synchronous belt 36, which synchronously drives the first gear plate 35 provided on the outer wall of the fifth rotating shaft 34 to rotate, thereby synchronously driving the fifth rotating shaft 34 to rotate the first processing roller shaft 104 in the same direction. When the raw material falls onto the balance plate 108, the rotating first processing roller shaft 104 and the second processing roller shaft 105 can guide the raw material falling from both sides of the balance plate 108 to move to the two sides of the first protective shell 101 through the first spiral pressing plate 106 and the second spiral pressing plate 107 provided on the outer walls of the first processing roller shaft 104 and the second processing roller shaft 105, and can be subjected to extrusion processing. In one aspect, this can disperse the processing of the raw material and improve the work efficiency. On the other hand, it can avoid the problem of jamming when the raw material is always accumulated in one place.

[0042] Further, the size of the material after extrusion processing may not be uniform, which affects the uniformity of the finished product. Referring to Figure 5 and Figure 7 As shown, the first filtering mechanism 4 comprises a connecting type rotating drum 41 rotatably installed on one side of the second protective shell 102, and a first filter plate 43 is fixedly installed on one side of the connecting type rotating drum 41. The first filter plate 43 is attached to the inner wall of the second protective shell 102, and a plurality of screen holes of uniform size are provided in the first filter plate 43. The purpose of this arrangement is that when the material after extrusion processing moves to the discharge port 103, the material smaller than the size of the screen holes can leak out through the first filter plate 43, while the larger material is retained on the first filter plate 43.Figure 7 and Figure 4 As shown, an internal gear ring 42 is fixedly installed on the side of the connecting drum 41 away from the first filter plate 43, and a second gear disk 44 is fixedly installed on the outer wall of the fifth rotating shaft 34. The second gear disk 44 and the internal gear ring 42 are meshed with each other. When the first processing roller shaft 104 and the second processing roller shaft 105 rotate, the second gear disk 44 can rotate synchronously to drive the internal gear ring 42 to rotate, thereby causing the first filter plate 43 to rotate in the inner cavity of the second protective shell 102. During the rotation, the large pieces of material left by the first filter plate 43 are flipped over again and poured onto the top of the first processing roller shaft 104 and the second processing roller shaft 105 for secondary extrusion processing, thereby ensuring that the size of the processed raw material remains uniform and improving the work quality.

[0043] Furthermore, refer to Figure 8 As shown, the pretreatment mechanism 2 includes a storage cylinder 21 fixedly installed on the top of the first protective shell 101. A support frame 22 is fixedly installed on the outer wall of the storage cylinder 21. The support frame 22 is fixedly installed on one side of the first protective shell 101. The bottom of the storage cylinder 21 is conical. The purpose of this design is to make the bottom of the storage cylinder 21 gradually smaller, so that the size of the material falling through the bottom of the storage cylinder 21 remains small, which facilitates the subsequent processing by the first spiral pressure plate 106 and the second spiral pressure plate 107, and avoids... To prevent the material from being too large, which would prevent the first spiral pressure plate 106 and the second spiral pressure plate 107 from extruding and processing it, a storage cylinder 21 is set on the vertical center surface of the balance plate 108. A top cover 23 is fixedly installed on the top of the storage cylinder 21, and a through-feed groove 24 is opened on the top of the top cover 23. In use, the raw material can be poured into the inner cavity of the storage cylinder 21 from the feed groove 24. After pre-processing, the raw material can fall out through the bottom of the storage cylinder 21 and fall onto the balance plate 108.

[0044] A first motor 25 is fixedly mounted on the top of the top cover 23, and a first rotating shaft 26 is fixedly connected to the end of the output shaft of the first motor 25. Figure 9 As shown, a second rotating rod 29 is fixedly connected to the bottom of the first rotating shaft 26. A spiral blade 210 is fixedly installed on the outer wall of the second rotating rod 29. The horizontal cross-sectional length of the spiral blade 210 is consistent with the inner circumferential diameter of the bottom of the storage cylinder 21. The purpose of this arrangement is to keep the size of the material that can be spiraled out by the spiral blade 210 relatively small, thereby preventing large pieces of material from clogging the bottom of the storage cylinder 21 and affecting the pouring of material into the inner cavity of the first protective shell 101. It also prevents large pieces of material from falling into the interior of the first protective shell 101 and affecting the processing of the first spiral pressure plate 106 and the second spiral pressure plate 107. Meanwhile, referring to... Figures 8-9As shown, the outer wall of the first rotating shaft 26 is fixedly installed with a first crushing knife 27 for primary crushing of the raw materials, and the bottom of the first crushing knife 27 is provided with a second crushing knife 28 for secondary crushing of the raw materials. In actual use, when the raw materials are poured into the inner cavity of the storage cylinder 21 through the feeding slot 24, the first motor 25 is started synchronously to make the first rotating shaft 26 rotate, which can synchronously make the first crushing knife 27 and the second crushing knife 28 perform rotary extrusion processing on the larger materials. At the same time, the materials processed by twice extrusion can be rotated out of the bottom of the storage cylinder 21 and fall into the inside of the first protective shell 101 through the second rotating rod 29 and the spiral blade 210.

[0045] Further, in order to avoid the large materials from blocking the bottom of the storage cylinder 21, referring to Figure 9 As shown, the outer wall of the first rotating shaft 26 is fixedly installed with a tapered limiting guide plate 51, the bottom of the tapered limiting guide plate 51 is fixedly installed with a limiting rod 52 fixed to the inner wall of the storage cylinder 21, the outer wall of the second rotating rod 29 is provided with a reciprocating thread groove 53, the outer wall of the reciprocating thread groove 53 is engaged with a second filter plate 54, and the second filter plate 54 is sleeved on the outer wall of the limiting rod 52. In the normal state, the second filter plate 54 moves at the lowest part of the reciprocating thread groove 53 to shield the bottom of the inner cavity of the storage cylinder 21, so that the materials of appropriate size can leak out through the internal gap of the second filter plate 54, and the large materials are left on the second filter plate 54. During the continuous rotation of the first rotating shaft 26, the second filter plate 54 reciprocally moves up and down on the outer wall of the reciprocating thread groove 53, so that the second filter plate 54 can lift the materials to move upwards, so that the materials can be subjected to extrusion processing again. The outer wall of the first rotating shaft 26 is fixedly installed with a scraper 211, one side of the scraper 211 is fixedly installed with a crushing roller 212. During the pretreatment of the raw materials, the second filter plate 54 reciprocally moves up and down in the inner cavity of the storage cylinder 21. In this process, the smaller materials can leak out through the gap between the second filter plate 54 and the storage cylinder 21, and the larger materials are blocked by the second filter plate 54. During the upward movement of the second filter plate 54, the large materials can contact the rotating scraper 211 and crushing roller 212 and be subjected to extrusion processing again. Thus, the size of the materials subjected to pretreatment is uniform, which can facilitate the processing of the first spiral pressing plate 106 and the second spiral pressing plate 107, thereby improving the work efficiency.

[0046] Finally should be explained a few points are: first, in the description of the present application, it should be pointed out that, unless otherwise specified and limited, the term "installation", "connected", "connection" should be broad, can be mechanical or electrical connection, but also can be two elements inside the communication, can be directly connected, "up", "down", "left", "right" and so on, only for indicating the relative position relationship, when the absolute position of the described object changes, the relative position relationship may change;

[0047] Second: the present application discloses the drawings in the embodiment, only involves the structure related to the present application, other structures can refer to the usual design, in the case of no conflict, the same embodiment and different embodiments of the present application can be combined with each other;

[0048] Finally: the above only for the preferred embodiment of the present application, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A biodegradable material double screw extruder, comprising a main body mechanism (1), a pretreatment mechanism (2) is fixedly installed at the vertical centerline position of the main body mechanism (1), and the inner cavity of the pretreatment mechanism (2) is provided with a second filtering mechanism (5); characterized in that The main body mechanism (1) comprises a first protective shell (101), both ends of the first protective shell (101) are fixedly connected with a second protective shell (102), the bottom of each of the two second protective shells (102) is provided with a discharge port (103) in a penetrating manner, a first processing roller shaft (104) and a second processing roller shaft (105) are rotatably connected between the two second protective shells (102), respectively, and the outer walls of the first processing roller shaft (104) and the second processing roller shaft (105) are fixedly installed with a first spiral pressing plate (106) and a second spiral pressing plate (107), respectively, a first filtering mechanism (4) is rotatably installed in the inner cavity of the second protective shell (102), and both ends of the first processing roller shaft (104) and the second processing roller shaft (105) are provided with a power mechanism (3); A balance plate (108) is fixedly installed at the vertical centerline position of the first protective shell (101), and the first processing roller shaft (104) and the second processing roller shaft (105) are rotatably installed in the interior of the balance plate (108); the top of the balance plate (108) is provided in an umbrella shape; The first spiral pressing plate (106) and the second spiral pressing plate (107) provided on the outer walls of the first processing roller shaft (104) and the second processing roller shaft (105) are arranged on both sides of the balance plate (108), respectively, and the spiral directions of the first spiral pressing plate (106) and the second spiral pressing plate (107) are arranged in opposite states; The power mechanism (3) comprises a third rotating shaft (31) rotatably installed on one side of the second protective shell (102), the third rotating shaft (31) and the second processing roller shaft (105) are arranged in a mutually fixed state, and a second motor (32) is fixedly installed on the end of the third rotating shaft (31) away from the second processing roller shaft (105); One end of the second processing roller shaft (105) away from the third rotating shaft (31) is fixedly connected with a fourth rotating shaft (33), both ends of the first processing roller shaft (104) are fixedly connected with a fifth rotating shaft (34), the fourth rotating shaft (33) and the fifth rotating shaft (34) are rotatably installed on one side of the second protective shell (102), one end of each of the fifth rotating shaft (34) and the fourth rotating shaft (33) is fixedly installed with a first gear plate (35), and the outer walls of the first gear plates (35) provided on the outer walls of the fourth rotating shaft (33) and the fifth rotating shaft (34) are all engaged with a synchronous belt (36). The first filtering mechanism (4) comprises a connecting rotary drum (41) rotatably installed on one side of the second protective shell (102), one side of the connecting rotary drum (41) is fixedly installed with a first filter plate (43), the first filter plate (43) is attached to the inner wall of the second protective shell (102), and a plurality of screen holes uniformly sized and arranged in a penetrating manner are formed in the first filter plate (43); The side, away from the first filter plate (43), of the connecting rotary drum (41) is fixedly installed with an internal gear ring (42), the outer wall of the fifth rotating shaft (34) is fixedly installed with a second gear disc (44), and the second gear disc (44) and the internal gear ring (42) are arranged in a meshing relationship.

2. A biodegradable material twin-screw extruder according to claim 1, characterized in that: The pretreatment mechanism (2) comprises a storage cylinder (21) fixedly installed on the top of the first protective shell (101), the outer wall of the storage cylinder (21) is fixedly installed with a supporting bracket (22), and the supporting bracket (22) is fixedly installed on one side of the first protective shell (101); The bottom of the storage cylinder (21) is arranged in a conical shape, the storage cylinder (21) is arranged on the vertically central surface of the balancing plate (108), the top of the storage cylinder (21) is fixedly installed with a top cover (23), and the top of the top cover (23) is arranged with an inlet slot (24) in a penetrating manner.

3. A biodegradable material twin-screw extruder according to claim 2, characterized in that: The top of the top cover (23) is fixedly installed with a first motor (25), the output shaft end of the first motor (25) is fixedly connected with a first rotating shaft (26), the bottom of the first rotating shaft (26) is fixedly connected with a second rotating rod (29), and the outer wall of the second rotating rod (29) is fixedly installed with a spiral blade (210). The horizontal cross-sectional length of the spiral blade (210) is consistent with the inner circumferential diameter length of the bottom of the storage cylinder (21).

4. A biodegradable material twin-screw extruder according to claim 3, characterized in that: The outer wall of the first rotating shaft (26) is fixedly installed with a first crushing knife (27), and the bottom of the first crushing knife (27) is provided with a second crushing knife (28).

5. A biodegradable material twin-screw extruder according to claim 4, characterized in that: The outer wall of the first rotating shaft (26) is fixedly installed with a conical limiting guide plate (51), the bottom of the conical limiting guide plate (51) is fixedly installed with a limiting rod (52) fixed to the inner wall of the storage cylinder (21), the outer wall of the second rotating rod (29) is arranged with a reciprocating screw groove (53), the outer wall of the reciprocating screw groove (53) is engaged with a second filter plate (54), and the second filter plate (54) is sleeved on the outer wall of the limiting rod (52); The outer wall of the first rotating shaft (26) is fixedly installed with a scraper (211), one side of the scraper (211) is fixedly installed with a crushing roller (212).

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