Single-screw extruder

Abstract

The invention relates to the technical field of plastic processing machinery, in particular to a single-screw extruder which comprises a shell, two transmission shafts are arranged in the shell, a reciprocating lead screw is fixedly connected between the two transmission shafts, one end of each transmission shaft penetrates through the shell and is movably connected with the shell, and the other end of each transmission shaft is movably connected with the shell. A spiral blade is fixedly connected to the side wall of one transmission shaft, a particle intercepting mechanism is arranged on the side wall of the transmission shaft, a material pushing mechanism is arranged on the side wall of the reciprocating lead screw, cutters which are evenly distributed are fixedly connected to the side wall of the transmission shaft, the top of the shell is open, an upper cover is arranged above the shell, and the lower cover is arranged above the shell. The top of the upper cover is fixedly connected with a feeding hopper, the bottom of the feeding hopper penetrates through the upper cover, the upper cover and the outer wall of the shell are fixedly connected with evenly-distributed lug plates respectively, bolts are installed between every two adjacent lug plates, and the bottom of the shell is fixedly connected with a supporting plate.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing machinery, and more specifically, to a single-screw extruder. Background Art

[0002] A single-screw extruder consists of a screw rotating in a heated barrel. Due to its simple structure, easy manufacturing, high processing efficiency, and low price, it is widely used and is currently the most used type of extruder in terms of technology.

[0003] After retrieval, it is found that the Chinese patent publication number is: CN212385777U, a single-screw extruder, which discloses a single-screw extruder, including a motor, a first rotating shaft, an extruder body, a feed hopper, a protective cover, and a movable block. A motor is arranged on one side of the extruder body, a first rotating shaft is arranged on the outer wall of one side of the motor, a first blade is arranged on the surface of the conical tube, a feed hopper is arranged on one side of the upper surface of the extruder body, a second rotating shaft is rotatably installed inside the feed hopper, and a second blade is installed on the surface of the second rotating shaft. This technical solution well solves the problem that after extruding viscous materials into pellets, it is easy to cause blockage at the discharge port.

[0004] However, the above patent still has deficiencies in actual use. First, the mixing effect of the materials is poor. Therefore, in the process of material transportation by the screw structure of the traditional single-screw extruder, it is difficult to achieve uniform mixing of multiple materials, which leads to differences in the material properties of different parts in the finally formed product, thus affecting the overall quality and performance stability of the product.

[0005] Secondly, the discharging process is not stable enough. In some existing single-screw extruders, the discharging often occurs intermittently, which makes it difficult for the extruded materials to form because the materials accumulate or block in the barrel, resulting in discontinuous discharging. This not only reduces production efficiency but also increases the scrap rate and raises production costs.

[0006] In addition, during the extrusion process, plastic particles need to be fully heated and melted to ensure the quality and forming effect of the extruded materials. However, the heating system of the traditional single-screw extruder often has uneven heating, resulting in insufficient melting of plastic particles. The uncompletely melted plastic particles will make the surface of the extruded materials rough, affecting the appearance quality of the product. More seriously, these unmelted particles may accumulate at the extrusion port, causing blockage at the outlet, further affecting the normal progress of production and even damaging the equipment.

[0007] Based on this, the present invention discloses a single-screw extruder. Summary of the Invention

[0008] To solve the technical problems raised in the background art, the present invention provides a single-screw extruder, which includes a housing. A transmission shaft is arranged inside the housing. There are two transmission shafts, and a reciprocating screw rod is fixedly connected between the two transmission shafts. A particle interception mechanism is arranged on the side wall of the transmission shaft to prevent materials from being blocked in the housing; A material pushing mechanism is arranged on the side wall of the reciprocating screw rod to drive the materials to be fully and evenly mixed. A transmission mechanism is arranged on one side of the housing, and the transmission mechanism is fixedly connected to one end of the transmission shaft.

[0009] Preferably, evenly distributed cutting knives are fixedly connected to the side wall of the transmission shaft. The top of the housing is open. An upper cover is arranged above the housing. A feed hopper is fixedly connected to the top of the upper cover. The bottom of the feed hopper penetrates the upper cover. The outer walls of the upper cover and the housing are respectively fixedly connected with evenly distributed ear plates. Bolts are installed between two adjacent ear plates. The bottom of the housing is fixedly connected with a support plate.

[0010] Preferably, the particle interception mechanism includes a fixed sieve plate. One end of the transmission shaft penetrates the housing and is movably connected to the housing. A spiral blade is fixedly connected to the side wall of one of the transmission shafts. The fixed sieve plate is fixed on the side wall of the transmission shaft. A uniformly distributed first sieve hole is opened on one side of the fixed sieve plate. A movable sieve plate is sleeved on the side wall of the transmission shaft. One side of the movable sieve plate is in contact with the fixed sieve plate and is provided with uniformly distributed second sieve holes. An arc-shaped opening is opened on one side of the fixed sieve plate. A wire column is arranged in the arc-shaped opening. One end of the wire column is fixedly connected to the movable sieve plate, and the other end extends to the outside of the arc-shaped opening and is provided with a nut.

[0011] Preferably, the material pushing mechanism includes a sliding tube. The sliding tube is installed on the side wall of the reciprocating screw rod. An extrusion plate is fixedly connected to the side wall of the sliding tube. A uniformly distributed connecting rod is fixedly connected to the side of the extrusion plate away from the second sieve hole. A conical ring is fixedly connected between the ends of several connecting rods away from the extrusion plate. The conical ring is slidably connected to the bottom of the inner cavity of the housing. A material blocking mechanism is arranged on the side wall of the extrusion plate.

[0012] Preferably, the transmission mechanism includes a fixing plate. The fixing plate is fixed on the side wall of the support plate. A motor is installed on the top of the fixing plate. The output end of the motor is fixedly connected with a small grooved pulley. One end of the transmission shaft is fixedly connected with a large grooved pulley. A belt is installed between the large grooved pulley and the small grooved pulley.

[0013] Preferably, the material blocking mechanism includes a plurality of rectangular openings which are evenly distributed on the side wall of the extrusion plate. A baffle is movably connected between the inner walls on both sides of the rectangular opening. Arc-shaped limiting grooves are respectively formed on the inner walls on both sides of the rectangular opening, and a cylindrical block is arranged in the arc-shaped limiting groove. One end of the cylindrical block extends into the rectangular opening and is fixedly connected to the baffle.

[0014] Preferably, movable rings are respectively movably connected to the side walls of the two transmission shafts near the reciprocating lead screw. Bellows are symmetrically sleeved on the side wall of the reciprocating lead screw. One end of the bellows is fixedly connected to the movable ring, and the other end is fixedly connected to the extrusion plate.

[0015] Preferably, a slide rail is fixedly connected to the bottom of the inner cavity of the housing, and a chute matching the slide rail is formed on the outer wall of the conical ring.

[0016] Preferably, the cutting knife is located inside a plurality of connecting rods.

[0017] Preferably, an extrusion die is installed on one side of the housing, and uniformly distributed discharge holes are formed on the side of the housing opposite to the extrusion die.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. For this single-screw extruder, through the mutual cooperation among the transmission shaft, the cutting knife, the motor, the large sheave, etc., when the motor drives the transmission shaft to rotate, the cutting knife can cut and stir the material, so that the material is fully and evenly mixed; 2. For this single-screw extruder, through the mutual cooperation among the extrusion plate, the reciprocating lead screw, the baffle, the connecting rod, the conical ring, etc., when the transmission shaft rotates, the extrusion plate and the conical ring will move left and right reciprocally, and the material will be pushed towards the outlet during the movement, effectively avoiding the problem that the material is blocked in the housing and causing intermittent extrusion; 3. For this single-screw extruder, through the mutual cooperation among the extrusion plate, the arc-shaped opening, the screw post, the fixed sieve plate, the first sieve holes, the movable sieve plate, the second sieve holes, etc., the movable sieve plate can rotate, so that the first sieve holes and the second sieve holes are staggered. By rotating to adjust the size of the space passing between the first sieve holes and the second sieve holes, the uncompletely melted granular material of the material can be intercepted, so that the granular material continues to be heated in the housing until it is completely melted and can pass between the first sieve holes and the second sieve holes, effectively solving the problems of affecting the product quality and causing blockage of the extrusion port. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the overall internal structural schematic diagram of the present invention; Figure 3 Schematic cross-sectional structure diagram of the housing of the present invention; Figure 4 Schematic overall structure diagram of the transmission shaft of the present invention Figure 5 Schematic position distribution diagram of the movable ring of the present invention; Figure 6 Schematic three-dimensional structure diagram of the extrusion plate of the present invention; Figure 7 Schematic three-dimensional structure diagram of the baffle of the present invention; Figure 8 Schematic position distribution diagram of the arc-shaped opening of the present invention; Figure 9 Schematic position distribution diagram of the second sieve hole of the present invention.

[0020] The meanings of each label in the figure are as follows: 1, housing; 2, transmission shaft; 3, reciprocating lead screw; 4, spiral blade; 5, discharge hole; 6, large sheave; 7, small sheave; 8, motor; 9, fixed plate; 10, extrusion plate; 11, rectangular opening; 12, baffle; 13, arc-shaped limiting groove; 14, sliding tube; 15, cylindrical block; 16, fixed sieve plate; 17, first sieve hole; 18, movable sieve plate; 19, second sieve hole; 20, arc-shaped opening; 21, screw post; 22, nut; 23, feed hopper; 24, movable ring; 25, bellows; 26, cutter; 27, connecting rod; 28, conical ring; 29, belt; 30, support plate; 31, upper cover; 32, ear plate; 33, bolt; 34, extrusion die. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Existing technical problems.

[0023] For this reason, the present invention provides a single-screw extruder, see Figures 1 to 8 as shown, including a housing 1, a transmission shaft 2 is arranged inside the housing 1, there are two transmission shafts 2, a reciprocating lead screw 3 is fixedly connected between the two transmission shafts 2, and a particle interception mechanism for preventing materials from being blocked in the housing 1 is arranged on the side wall of the transmission shaft 2; A material pushing mechanism for driving the materials to be fully and evenly mixed is arranged on the side wall of the reciprocating lead screw 3, and a transmission mechanism is arranged on one side of the housing 1.

[0024] A cutter 26 is fixedly connected to the side wall of the transmission shaft 2 in a uniformly distributed manner. The top of the housing 1 is open. A top cover 31 is arranged above the housing 1. A feed hopper 23 is fixedly connected to the top of the top cover 31. The bottom of the feed hopper 23 penetrates through the top cover 31. Lugs 32 are fixedly connected to the outer walls of the top cover 31 and the housing 1 in a uniformly distributed manner. A bolt 33 is installed between two adjacent lugs 32. A support plate 30 is fixedly connected to the bottom of the housing 1. The transmission mechanism is fixedly connected to one end of the transmission shaft 2. An extrusion die 34 is installed on one side of the housing 1. A uniformly distributed discharge hole 5 is formed in the side of the housing 1 opposite to the extrusion die 34.

[0025] See Figures 8 to 9 As shown, the particle interception mechanism includes a fixed sieve plate 16. One end of the transmission shaft 2 penetrates through the housing 1 and is movably connected to the housing 1. A spiral blade 4 is fixedly connected to the side wall of one of the transmission shafts 2. The fixed sieve plate 16 is fixed to the side wall of the transmission shaft 2. A uniformly distributed first sieve hole 17 is formed in one side of the fixed sieve plate 16. A movable sieve plate 18 is sleeved on the side wall of the transmission shaft 2. One side of the movable sieve plate 18 is in contact with the fixed sieve plate 16 and is provided with uniformly distributed second sieve holes 19. An arc-shaped opening 20 is formed in one side of the fixed sieve plate 16. A wire column 21 is arranged in the arc-shaped opening 20. One end of the wire column 21 is fixedly connected to the movable sieve plate 18, and the other end extends to the outside of the arc-shaped opening 20 and is provided with a nut 22.

[0026] During operation, the space size passing between the second sieve holes 19 and the first sieve holes 17 can be adjusted according to the actual type of the material to adapt to different types of extrusion dies 34 and materials. When adjusting, first remove the lugs 32, open the top cover 31, then loosen the nut 22, and then rotate the movable sieve plate 18 forward or backward. In this way, the staggered space size between the second sieve holes 19 and the first sieve holes 17 can be adjusted. After adjusting according to the needs, tighten the nut 22 to fix the adjusted state and prevent displacement from occurring again during use. Both the fixed sieve plate 16 and the movable sieve plate 18 are made of stainless steel. The stainless steel material is relatively stable during use and is not prone to deformation. In addition, when the stainless steel material is used, it has the advantages of high temperature resistance and corrosion resistance.

[0027] See Figures 2 to 7As shown in the figure, the material pushing mechanism includes a sliding tube 14 which is installed on the side wall of the reciprocating lead screw 3. A pressing plate 10 is fixedly connected to the side wall of the sliding tube 14. On the side of the pressing plate 10 away from the second sieve hole 19, evenly distributed connecting rods 27 are fixedly connected. A conical ring 28 is fixedly connected between the ends of several connecting rods 27 away from the pressing plate 10. The conical ring 28 is slidably connected to the bottom of the inner cavity of the housing 1. A material blocking mechanism is arranged on the side wall of the pressing plate 10. The material blocking mechanism includes a number of rectangular openings 11 which are evenly distributed and opened on the side wall of the pressing plate 10. A baffle 12 is movably connected between the inner walls on both sides of the rectangular opening 11. Arc-shaped limiting grooves 13 are respectively opened on the inner walls on both sides of the rectangular opening 11. A cylindrical block 15 is arranged in the arc-shaped limiting groove 13. One end of the cylindrical block 15 extends into the rectangular opening 11 and is fixedly connected to the baffle 12.

[0028] During operation, the sliding tube 14 can drive the pressing plate 10 to slide left and right reciprocally. During the sliding process, materials can be collected and pushed towards the spiral blade 4. When the pressing plate 10 moves towards the cutting knife 26, it will come into contact with the materials. At this time, when the baffle 12 contacts the materials, it will receive a thrust force. This thrust force causes the baffle 12 to swing left when the pressing plate 10 displaces, so that the rectangular opening 11 can be opened, allowing more materials to pass through the rectangular opening 11 to reach the left side of the pressing plate 10. When the pressing plate 10 displaces to the left, the materials will also give the baffle 12 a thrust force, which causes the baffle 12 to return to the vertical state. Through the limitation of the arc-shaped limiting groove 13, the baffle 12 can swing left, and will not open the rectangular opening 11, nor will it swing right, so that when the rectangular opening 11 is displaced to the left and receives a thrust force, the baffle 12 will be in the vertical state. In this way, the pressing plate 10 and the baffle 12 can push the materials to the left.

[0029] See Figures 2 to 3 As shown in the figure, the transmission mechanism includes a fixing plate 9 which is fixed on the side wall of the support plate 30. A motor 8 is installed on the top of the fixing plate 9. The output end of the motor 8 is fixedly connected with a small grooved pulley 7. One end of a transmission shaft 2 is fixedly connected with a large grooved pulley 6. A belt 29 is installed between the large grooved pulley 6 and the small grooved pulley 7.

[0030] During operation, after the motor 8 is started, it will drive the small grooved pulley 7 to rotate. Synchronously, the small grooved pulley 7 drives the large grooved pulley 6 and the transmission shaft 2 to rotate through the belt 29. The diameter of the small grooved pulley 7 is smaller than that of the large grooved pulley 6, which can play a role in deceleration and increasing torque to a certain extent. The motor 8 is a relatively common driving device in the existing technology, and its installation method and working principle are common knowledge in this field, so they will not be described in detail in this technical solution.

[0031] In addition, movable rings 24 are respectively and movably connected to the side walls of the two transmission shafts 2 near the reciprocating lead screw 3. Bellows 25 are symmetrically sleeved on the side wall of the reciprocating lead screw 3. One end of the bellows 25 is fixedly connected to the movable ring 24, and the other end is fixedly connected to the extrusion plate 10.

[0032] In this technical solution, the material of the bellows 25 is specifically silicone rubber. This material has outstanding high-temperature resistance and can be used in a high-temperature environment above 200 °C for a long time. The instantaneous temperature resistance can reach 300 °C or even higher. Silicone rubber also has good electrical insulation, physiological inertness and low surface tension. Its elasticity and flexibility can be well maintained at high temperatures. The bellows 25 made of this material can well adapt to the long-term high-temperature environment in the housing 1 and is more stable in use. Through the bellows 25, the material will not come into contact with the reciprocating lead screw 3, preventing the material from entering the sliding tube 14 and adhering to the reciprocating lead screw 3, resulting in resistance between the sliding tube 14 and the reciprocating lead screw 3.

[0033] Among them, a slide rail is fixedly connected to the bottom of the inner cavity of the housing 1. A chute matching the slide rail is opened on the outer wall of the conical ring 28. Through the slide rail and the chute, the conical ring 28 can only reciprocate left and right during use, so it will also limit the sliding tube 14 from rotating along with the reciprocating lead screw 3 during use, mainly playing a role in restricting the rotation of the sliding tube 14.

[0034] In addition, the cutter 26 is located inside several connecting rods 27, so that the cutter 26 will not touch the connecting rods 27 when rotating, and the cutter 26 can cut and mix the material.

[0035] In summary, it effectively solves the problems of some existing extruders, such as poor mixing effect of materials, intermittent discharging due to material blockage inside, and easy blockage of the extrusion port by incompletely melted material particles.

[0036] Working principle: When the present invention is in use, it needs to cooperate with a heating device of the prior art to heat the housing 1 and the upper cover 31. Then, the motor 8 is started by an external power supply. The motor 8 drives the small sheave 7 to rotate. The small sheave 7 drives the large sheave 6 to rotate through the belt 29. Synchronously, the large sheave 6 drives the transmission shaft 2 and the reciprocating lead screw 3 to rotate. When the transmission shaft 2 rotates, it drives the spiral blade 4 and the cutter 26 to rotate. Among them, when the reciprocating lead screw 3 rotates, it drives the sliding tube 14 and the pressing plate 10 to reciprocate left and right. Synchronously, it drives the conical ring 28 to reciprocate left and right through the connecting rod 27. At this time, the material can be poured into the feed hopper 23 and then enter the housing 1 through the feed hopper 23. At this time, the conical ring 28 pushes the material to the left. When the conical ring 28 moves to the right, it shovels up the material through the conical surface, so that the material reaches the other side of the conical ring 28 through the conical ring 28. When the conical ring 28 moves to the left, it pushes the material to move to the left, so that the material contacts the cutter 26. Repeating this way can convey and cut more materials. During the cutting process, the materials can be evenly mixed. As more materials accumulate and the conical ring 28 continuously pushes, the materials will gradually move to the left. Next, when the pressing plate 10 moves to the right, it will contact the materials. When the baffle 12 moves to the right and encounters resistance, it will swing to the left to open the rectangular opening 11. At this time, the materials will pass through the rectangular opening 11 to the other side of the pressing plate 10. When the pressing plate 10 moves to the left, it will push the materials passing through the rectangular opening 11 to the left to contact the movable sieve plate 18. At the same time, when the baffle 12 follows the pressing plate 10 to move to the left, it will contact the materials. Therefore, resistance will occur. The resistance will push the baffle 12 to the initial position, so that the materials can be blocked, enabling the pressing plate 10 to push more materials when moving to the left and pressing the materials, so that the materials pass between the second sieve holes 19 and the first sieve holes 17. The materials are filtered by the space size between the second sieve holes 19 and the first sieve holes 17, so that the granular materials can be intercepted and continue to be heated and melted in the housing 1. Repeating this way can convey, mix and filter more materials. The materials passing through the second sieve holes 19 and the first sieve holes 17 will reach the left side of the fixed sieve plate 16, and the spiral blade 4 will convey the materials to the leftmost side of the housing 1 and pass through the discharge hole 5. Finally, under the conveyance of the spiral blade 4, the materials are extruded through the extrusion die 34 to form a product, effectively solving the problems that the outlet is blocked by incompletely melted materials, the mixing is not uniform enough, and the materials are prone to accumulation.

[0037] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single screw extruder, comprising a housing (1), characterized in that: A transmission shaft (2) is arranged in the shell (1), two transmission shafts (2) are arranged, a reciprocating screw rod (3) is fixedly connected between the two transmission shafts (2), and a particle interception mechanism for preventing material from clogging the shell (1) is arranged on the side wall of the transmission shaft (2); A material pushing mechanism for driving the material to be fully and evenly mixed is arranged on the side wall of the reciprocating screw (3), and a transmission mechanism is arranged on one side of the housing (1), wherein the transmission mechanism is fixedly connected to one end of the transmission shaft (2).

2. A single screw extruder according to claim 1, characterized in that: The side wall of the transmission shaft (2) is fixedly connected with evenly distributed cutters (26); the top of the shell (1) is open; an upper cover (31) is arranged above the shell (1); a feed hopper (23) is fixedly connected to the top of the upper cover (31); the bottom of the feed hopper (23) passes through the upper cover (31); evenly distributed ear plates (32) are fixedly connected to the upper cover (31) and the outer wall of the shell (1); bolts (33) are installed between two adjacent ear plates (32); and a support plate (30) is fixedly connected to the bottom of the shell (1).

3. A single screw extruder according to claim 1, characterized in that: The particle interception mechanism comprises a fixed screen plate (16), one end of the transmission shaft (2) passes through the housing (1) and is movably connected to the housing (1), a spiral blade (4) is fixedly connected to one side wall of the transmission shaft (2), the fixed screen plate (16) is fixed to the side wall of the transmission shaft (2), one side of the fixed screen plate (16) is provided with evenly distributed first screen holes (17), a movable screen plate (18) is sleeved on the side wall of the transmission shaft (2), one side of the movable screen plate (18) contacts with the fixed screen plate (16) and is provided with evenly distributed second screen holes (19), one side of the fixed screen plate (16) is provided with an arc-shaped opening (20), a thread column (21) is arranged in the arc-shaped opening (20), one end of the thread column (21) is fixedly connected to the movable screen plate (18), and the other end extends to the outside of the arc-shaped opening (20) and is provided with a nut (22).

4. A single screw extruder according to claim 1, characterized in that: The material pushing mechanism comprises a slide tube (14), the slide tube (14) being mounted on the side wall of the reciprocating screw rod (3), the side wall of the slide tube (14) being fixedly connected to an extrusion plate (10), the side of the extrusion plate (10) being fixedly connected to evenly distributed connecting rods (27) away from the second sieve hole (19), a plurality of connecting rods (27) being fixedly connected to the ends of the extrusion plate (10) away from each other with conical rings (28), the conical rings (28) being slidably connected to the bottom of the inner cavity of the shell (1), and a material blocking mechanism being arranged on the side wall of the extrusion plate (10).

5. A single screw extruder according to claim 4, characterized in that: The transmission mechanism comprises a fixed plate (9), the fixed plate (9) being fixed on a side wall of a support plate (30), a motor (8) being mounted on the top of the fixed plate (9), a small groove wheel (7) being fixedly connected to an output end of the motor (8), a large groove wheel (6) being fixedly connected to one end of the transmission shaft (2), and a belt (29) being mounted between the large groove wheel (6) and the small groove wheel (7).

6. A single screw extruder according to claim 4, characterized in that: The material blocking mechanism comprises a plurality of rectangular openings (11), wherein the plurality of rectangular openings (11) are evenly distributed and opened on the side wall of the extrusion plate (10), a baffle (12) is movably connected between the inner walls on both sides of the rectangular opening (11), and arc-shaped limiting grooves (13) are respectively opened on the inner walls on both sides of the rectangular opening (11), and a cylindrical block (15) is connected in the arc-shaped limiting groove (13), and one end of the cylindrical block (15) extends into the rectangular opening (11) and is fixedly connected to the baffle (12).

7. A single screw extruder according to claim 4, characterized in that: A movable ring (24) is movably connected to the side wall of the two transmission shafts (2) near the reciprocating screw rod (3), and a bellows (25) is symmetrically sleeved on the side wall of the reciprocating screw rod (3). One end of the bellows (25) is fixedly connected to the movable ring (24), and the other end is fixedly connected to the extrusion plate (10).

8. A single screw extruder according to claim 4, characterized in that: A slide rail is fixedly connected to the bottom of the inner cavity of the shell (1), and a slide groove matching the slide rail is formed on the outer wall of the conical ring (28).

9. A single screw extruder according to claim 2, characterized in that: The cutter (26) is located inside the plurality of connecting rods (27).

10. A single screw extruder according to claim 1, characterized in that: An extrusion die (34) is installed on one side of the housing (1), and evenly distributed discharge holes (5) are provided on a side of the housing (1) opposite to the extrusion die (34).

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