Cooling system of degradable plastic double-screw extruder

Abstract

The utility model discloses a cooling system of a degradable plastic double-screw extruder. The cooling system comprises a base and a cooling tank, supporting arms are symmetrically mounted at two ends of the outer walls of two sides of the base through rotating shafts, and sliding blocks are movably connected to the top ends of the supporting arms through rotating shafts; rail grooves are fixedly formed in the lower portions of the outer walls of the two sides of the cooling groove, and the sliding blocks are installed in movable grooves of the rail grooves in a sliding mode, so that the cooling groove is installed above the base in a liftable mode through supporting arms; swing arms are hinged to the two sides of the inner wall of the cooling tank through rotating shafts, and pressing rods are transversely and rotationally connected to the bottom ends of the swing arms. The problems that in the prior art, equipment is poor in adaptability, difficult to maintain, poor in cooling effect and the like can be effectively solved through the lifting cooling groove structure and the dynamic pressing rod angle adjusting mechanism, the accurate adjusting function of the pressing rod angle ensures that a profile makes full contact with cooling liquid, meanwhile, the pressing rod swings, and the cooling efficiency is further improved. And reliable technical support is provided for efficient extrusion production of degradable plastics.

Description

Technical Field

[0001] This utility model relates to the field of biodegradable plastic production technology, and in particular to a cooling system for a biodegradable plastic twin-screw extruder. Background Technology

[0002] In the twin-screw extrusion production of biodegradable plastics, the performance of the cooling system directly affects product quality and production efficiency. Traditional extruder cooling systems generally suffer from the following technical problems:

[0003] Existing cooling tanks are usually fixedly installed on the base, which cannot be adjusted according to the height of the twin-screw extruders on different production lines, resulting in poor equipment compatibility. In addition, when it is necessary to clean or repair the inside of the cooling tank, the fixed structure restricts the operating space, making maintenance difficult and seriously affecting the continuity of production.

[0004] Traditional cooling systems typically use fixed pressure bars, which cannot dynamically adjust the pressure angle according to the cross-sectional shape of the plastic profile and the cooling requirements. This results in insufficient contact between the profile and the coolant, leading to uneven cooling in certain areas and causing quality defects such as profile deformation and dimensional deviations. In addition, fixed pressure bars cannot drive the profile to swing during the cooling process, resulting in low cooling efficiency.

[0005] Therefore, how to provide a cooling system for a biodegradable plastic twin-screw extruder is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] One objective of this invention is to provide a cooling system for a biodegradable plastic twin-screw extruder. This invention effectively solves the problems of poor equipment adaptability, difficult maintenance, and poor cooling effect in the prior art through a liftable cooling tank structure and a dynamic pressure bar angle adjustment mechanism. The precise adjustment function of the pressure bar angle ensures full contact between the profile and the coolant, significantly improving cooling uniformity and product qualification rate. At the same time, the swinging of the pressure bar further improves the cooling efficiency, providing reliable technical support for the efficient extrusion production of biodegradable plastics.

[0007] A cooling system for a biodegradable plastic twin-screw extruder according to an embodiment of the present invention includes a base and a cooling tank;

[0008] Support arms are symmetrically installed at both ends of the outer walls on both sides of the base via a pivot, and a slider is movably connected to the top of the support arm via a pivot.

[0009] The lower part of the outer wall on both sides of the cooling tank is fixedly provided with rail grooves, and the slider is slidably installed in the movable groove of the rail groove, so that the cooling tank can be raised and lowered above the base by the support arm.

[0010] The inner wall of the cooling tank is hinged to two sides by a pivot, and a pressure rod is rotatably connected to the bottom end of the pivot.

[0011] A sector gear is fixedly connected to the outer wall of the cooling tank and the rotating shaft. A slide groove is fixedly provided above the sector gear. A slide rod is slidably installed in the slide groove. Tooth blocks that mesh with the tooth grooves of the sector gear are provided on both sides of the slide rod at the bottom.

[0012] Furthermore, a lead screw is rotatably mounted laterally within the movable groove of the track, and a threaded hole that mates with the lead screw is provided inside the slider. The lead screw passes through the threaded hole and forms a threaded transmission connection with the slider.

[0013] Furthermore, a servo motor is fixedly installed at one end of the track groove, and the output shaft of the servo motor is connected to the lead screw drive to drive the lead screw to rotate in order to adjust the position of the slider in the track groove.

[0014] Furthermore, an electric push rod is fixedly installed on one side of the top of the slide rail, and a connecting block is fixedly connected to the middle of the top of the slide rod. The connecting block passes through the top opening of the slide rail and is fixedly connected to the end of the telescopic rod of the electric push rod, so that the slide rod can be driven to slide in the slide rail by the electric push rod.

[0015] Furthermore, the support arm is hinged to the base and the slider at both ends via pivots, forming a support structure that can rotate around the pivots, allowing the cooling tank to lift and lower by swinging the support arm.

[0016] Furthermore, the slider slides into the movable groove of the track groove, and the shape of the slider matches the cross-sectional shape of the movable groove to restrict the movement direction of the slider within the track groove.

[0017] Furthermore, the swing arm is hinged to the inner wall of the cooling tank via a rotating shaft, and the swing arm can swing around the rotating shaft to drive the pressure rod to adjust its angle within the cooling tank.

[0018] Furthermore, the sector gear is coaxially and fixedly connected to the rotating shaft, and the tooth block meshes with the tooth groove of the sector gear. When the slide rod slides in the slide groove, the swing arm is driven to swing through the meshing transmission between the tooth block and the sector gear.

[0019] Furthermore, the length of the slide rod is adapted to the length of the slide groove, and the sliding stroke of the slide rod in the slide groove satisfies the complete meshing transmission requirements of the tooth block and the sector gear.

[0020] Furthermore, the pressure rod is mounted laterally to the bottom of the swing arm via a bearing, and the pressure rod can rotate around its own axis to adapt to the movement requirements of the plastic profile during the cooling process.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model achieves precise adjustment of the pressure rod angle through the meshing transmission of a sector gear and a sliding rod's toothed block within the cooling tank. When the electric push rod drives the sliding rod to slide within the groove, the toothed block drives the sector gear to rotate, thereby causing the swing arm to swing around the axis and adjust the tilt angle of the pressure rod. Because this equipment can dynamically adjust the pressure angle of the pressure rod according to the cross-sectional shape of the plastic profile and the cooling requirements, it ensures full contact between the profile and the coolant, avoids deformation or quality defects caused by uneven local cooling, significantly improves the cooling effect and product qualification rate, and the profile can also be continuously oscillated by the pressure rod during the cooling process to improve cooling efficiency.

[0023] 2. This utility model uses a hinged structure between the base and the support arm, combined with a lead screw and servo motor drive in the rail groove, to precisely raise and lower the cooling tank. During operation, the servo motor drives the lead screw to rotate, causing the slider to move horizontally in the rail groove, and the support arm swings accordingly, thereby realizing the height adjustment of the cooling tank. This design can not only adapt to twin-screw extruder production lines of different heights, but also lower the cooling tank to a low position during equipment maintenance, greatly reducing the difficulty of operation and improving production flexibility and maintenance efficiency. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of a cooling system for a biodegradable plastic twin-screw extruder proposed in this utility model;

[0026] Figure 2 This is a bottom view of the cooling system for a biodegradable plastic twin-screw extruder proposed in this utility model.

[0027] Figure 3 This is a schematic diagram showing the positional relationship of the slide bar, toothed block, and sector gear in a cooling system for a biodegradable plastic twin-screw extruder proposed in this utility model.

[0028] Figure 4 This is a schematic diagram of the support arm and slider of a cooling system for a biodegradable plastic twin-screw extruder proposed in this utility model.

[0029] In the diagram: 1. Base; 2. Cooling tank; 3. Support arm; 4. Rail groove; 5. Slider; 6. Servo motor; 7. Slide groove; 8. Swing arm; 9. Pressure rod; 10. Sector gear; 11. Gear block; 12. Electric push rod; 13. Movable groove; 14. Lead screw; 15. Slide rod; 16. Connecting block; 17. Screw hole; 18. Rotating shaft. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0031] Example 1

[0032] refer to Figure 1 , 2 and Figure 4 A cooling system for a biodegradable plastic twin-screw extruder, comprising a base 1 and a cooling tank 2;

[0033] Support arms 3 are symmetrically hinged at both ends of the outer walls on both sides of the base 1 via pivots. The top of the support arm 3 is movably connected to the slider 5 via another pivot. Track grooves 4 are fixedly installed on the lower part of the outer walls on both sides of the cooling tank 2. Movable grooves 13 extending horizontally are opened inside the track grooves 4. The slider 5 has a cuboid structure that matches the cross-sectional shape of the movable groove 13 and is slidably embedded in the movable groove 13.

[0034] In this system, a lead screw 14 is rotatably mounted in the movable groove 13 of the track groove 4. A screw hole 17 matching the pitch of the lead screw 14 is opened inside the slider 5. The lead screw 14 passes through the screw hole 17 and forms a threaded transmission connection with the slider 5. A servo motor 6 is fixedly mounted at one end of the track groove 4. The output shaft of the servo motor 6 is connected to one end of the lead screw 14 through a coupling.

[0035] In this embodiment, when the servo motor 6 is started, the lead screw 14 rotates and drives the slider 5 to move horizontally in the movable groove 13 of the track groove 4. Then, through the hinge structure of the support arm 3, the cooling tank 2 is pushed to swing around the rotating shaft of the base 1, thereby realizing the lifting and lowering action of the cooling tank 2. The hinge design of the support arm 3, the base 1, and the slider 5 ensures the stability of the lifting and lowering process of the cooling tank 2.

[0036] Example 2

[0037] refer to Figure 1-3 The inner walls of the cooling tank 2 are hinged to the two sides by the rotating shaft 18. The bottom end of the swing arm 8 is connected to the pressure rod 9 by the bearing. The pressure rod 9 can rotate around its own axis to adapt to the movement of the plastic profile. The outer wall of the cooling tank 2 is fixedly connected to the sector gear 10 coaxially with the rotating shaft 18. The central angle of the sector gear 10 is designed to be 90°-120° to meet the swing requirements of the swing arm 8.

[0038] Above the sector gear 10, a vertically extending slide groove 7 is fixedly installed on the outer wall of the cooling tank 2. A slide rod 15 is slidably installed in the slide groove 7. Tooth blocks 11 are extended from the bottom of both sides of the slide rod 15. The tooth shape of the tooth blocks 11 is fully engaged with the tooth groove of the sector gear 10. An electric push rod 12 is fixedly installed on one side of the top of the slide groove 7. A connecting block 16 is fixedly connected to the middle of the top of the slide rod 15. The connecting block 16 passes through the top opening of the slide groove 7 and is fixedly connected to the end of the telescopic rod of the electric push rod 12.

[0039] In this embodiment, when the electric push rod 12 extends or retracts, the slide rod 15 reciprocates vertically within the slide groove 7. Through the meshing transmission between the tooth block 11 and the sector gear 10, the sector gear 10 is driven to rotate around the rotating shaft 18, thereby driving the swing arm 8 to swing around the rotating shaft 18, thus realizing the angle adjustment of the pressure rod 9 within the cooling tank 2.

[0040] Example 3

[0041] refer to Figure 1-4 This embodiment further refines the connection and movement relationships of each component based on Embodiments 1 and 2;

[0042] The shape of the slider 5 is strictly matched with the cross-sectional shape of the movable groove 13 of the rail groove 4, such as a rectangular cross-section, ensuring that the slider 5 can only slide along the horizontal direction of the movable groove 13 and avoid lateral swaying. The thread fit between the lead screw 14 and the screw hole 17 is of high precision, ensuring the smooth movement and positioning accuracy of the slider 5.

[0043] Secondly, the swing arm 8 is hinged to the inner wall of the cooling tank 2 via a pivot 18, the axis of which is parallel to the width direction of the cooling tank 2. The pressure rod 9 is mounted on the bottom end of the swing arm 8 via a bearing. The bearing allows the pressure rod 9 to rotate freely, reducing friction with the plastic profile.

[0044] In addition, the length of the tooth block 11 matches the effective engagement arc length of the sector gear 10, ensuring that the sliding stroke of the slide rod 15 in the slide groove 7 can drive the sector gear 10 to rotate within an angle of 180°, thereby meeting the maximum swing requirement of the swing arm 8. The tooth surfaces of both the tooth block 11 and the sector gear 10 are hardened to improve wear resistance and transmission efficiency.

[0045] Working principle: When the height of the cooling tank 2 needs to be adjusted, the servo motor 6 is started. The servo motor 6 drives the lead screw 14 to rotate. The lead screw 14 drives the slider 5 to move horizontally in the movable groove 13 of the track groove 4 through the screw hole 17. The movement of the slider 5 is converted into the lifting and lowering motion of the cooling tank 2 through the hinge structure of the support arm 3 until the cooling tank 2 reaches the required height. Then, according to the specifications of the plastic profile, the electric push rod 12 is started. The telescopic rod of the electric push rod 12 extends and retracts, driving the slide rod 15 to slide up and down in the slide groove 7 through the connecting block 16. The toothed block 11 at the bottom of the slide rod 15 meshes with the sector gear 10, driving the sector gear 15 to move up and down. The gear 10 rotates, causing the swing arm 8 to swing around the shaft 18, adjusting the angle and position of the pressure rod 9 to ensure that the pressure rod 9 can stably press the plastic profile. After the plastic profile is extruded from the twin-screw extruder, it enters the cooling tank 2. The pressure rod 9 applies appropriate pressure to the profile under the drive of the swing arm 8 to ensure that the profile is in full contact with the coolant. The coolant in the cooling tank 2 cools and shapes the profile, completing the extrusion cooling process of the biodegradable plastic. After the cooling operation is completed, the servo motor 6 and the electric push rod 12 move in opposite directions to reset the cooling tank 2 to the initial position, and the pressure rod 9 returns to the standby state, waiting for the next operation.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A degradable plastic twin-screw extruder cooling system characterized by, The base (1) and the cooling tank (2) are included. The support arms (3) are symmetrically installed at both ends of the outer walls on both sides of the base (1) through the rotating shafts, and the sliding blocks (5) are movably connected to the top ends of the support arms (3) through the rotating shafts. The rail grooves (4) are fixedly arranged at the lower parts of the outer walls on both sides of the cooling tank (2), the sliding blocks (5) are slidably installed in the movable grooves (13) of the rail grooves (4), and the cooling tank (2) is movably installed above the base (1) through the support arms (3). The swing arms (8) are hingedly connected to the inner walls on both sides of the cooling tank (2) through the rotating shafts (18), and the pressure rods (9) are transversely and rotatably connected to the bottom ends of the swing arms (8). The fan gears (10) are fixedly connected to the outer walls of the cooling tank (2) and the rotating shafts (18), the sliding grooves (7) are fixedly arranged above the fan gears (10), the sliding rods (15) are slidably installed in the sliding grooves (7), and the tooth blocks (11) are arranged at the bottom parts of the sliding rods (15) and engaged with the gear grooves of the fan gears (10).

2. A degradable plastic twin-screw extruder cooling system according to claim 1, characterized in that, The movable grooves (13) of the rail grooves (4) are transversely and rotatably installed with the lead screws (14), the screw holes (17) are arranged in the sliding blocks (5) and matched with the lead screws (14), the lead screws (14) pass through the screw holes (17) and are in threaded transmission connection with the sliding blocks (5).

3. A degradable plastic twin-screw extruder cooling system according to claim 2, wherein, One end of the rail groove (4) is fixedly installed with the servo motor (6), the output shaft of the servo motor (6) is in transmission connection with the lead screw (14), and the lead screw (14) is driven to rotate to adjust the position of the sliding block (5) in the rail groove (4).

4. The degradable plastic twin-screw extruder cooling system of claim 1, wherein, The electric push rods (12) are fixedly installed at one side of the top part of the sliding groove (7), the connecting blocks (16) are fixedly connected to the middle parts of the top ends of the sliding rods (15), the connecting blocks (16) pass through the top openings of the sliding grooves (7) and are fixedly connected to the end parts of the telescopic rods of the electric push rods (12), and the sliding rods (15) are driven to slide in the sliding grooves (7) through the electric push rods (12).

5. The degradable plastic twin-screw extruder cooling system of claim 1, wherein, The support arms (3) are hingedly connected to the base (1) and the sliding block (5) through the rotating shafts at both ends, respectively, to form a support structure that can rotate around the rotating shafts, so that the cooling tank (2) can be lifted and lowered through the swing of the support arms (3).

6. A degradable plastic twin-screw extruder cooling system according to claim 1, wherein, The sliding block (5) is in sliding connection with the movable groove (13) of the rail groove (4), and the shape of the sliding block (5) is matched with the sectional shape of the movable groove (13) to limit the movement direction of the sliding block (5) in the rail groove (4).

7. A degradable plastic twin-screw extruder cooling system according to claim 1, wherein, The swing arm (8) is hingedly connected to the inner wall of the cooling tank (2) through the rotating shaft (18), and the swing arm (8) can swing around the rotating shaft (18) to drive the pressure rod (9) to adjust the angle in the cooling tank (2).

8. A degradable plastic twin-screw extruder cooling system according to claim 1, wherein, The fan gear (10) is coaxially and fixedly connected to the rotating shaft (18), and the tooth block (11) is engaged with the gear groove of the fan gear (10), so that when the sliding rod (15) slides in the sliding groove (7), the swing arm (8) is driven to swing through the engagement transmission of the tooth block (11) and the fan gear (10).

9. A degradable plastic twin-screw extruder cooling system according to claim 1, wherein, The length of the sliding rod (15) is matched with the length of the sliding groove (7), and the sliding stroke of the sliding rod (15) in the sliding groove (7) meets the complete engagement transmission requirement of the tooth block (11) and the fan gear (10).

10. The degradable plastic twin-screw extruder cooling system of claim 1, wherein, The pressing rod (9) is transversely rotatably mounted at the bottom end of the swing arm (8) by a bearing, and the pressing rod (9) can rotate around its own axis to adapt to the movement requirement of the plastic profile during the cooling process.

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